summaryrefslogtreecommitdiff
path: root/drivers/tty/serial
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2024-05-22 21:53:02 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2024-05-22 21:53:02 +0300
commitf6b8e86b7a65495d3947a1d1fc22183c52f786f6 (patch)
treef0b15efd2dc851079a55a7b4e8a198fb6faa97ec /drivers/tty/serial
parent89601f675b008ed0fd66c060fb23354a106436bb (diff)
parente21de1455a721a0cb4217b18589ede846f5b0686 (diff)
downloadlinux-f6b8e86b7a65495d3947a1d1fc22183c52f786f6.tar.xz
Merge tag 'tty-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty / serial updates from Greg KH: "Here is the big set of tty/serial driver changes for 6.10-rc1. Included in here are: - Usual good set of api cleanups and evolution by Jiri Slaby to make the serial interfaces move out of the 1990's by using kfifos instead of hand-rolling their own logic. - 8250_exar driver updates - max3100 driver updates - sc16is7xx driver updates - exar driver updates - sh-sci driver updates - tty ldisc api addition to help refuse bindings - other smaller serial driver updates All of these have been in linux-next for a while with no reported issues" * tag 'tty-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (113 commits) serial: Clear UPF_DEAD before calling tty_port_register_device_attr_serdev() serial: imx: Raise TX trigger level to 8 serial: 8250_pnp: Simplify "line" related code serial: sh-sci: simplify locking when re-issuing RXDMA fails serial: sh-sci: let timeout timer only run when DMA is scheduled serial: sh-sci: describe locking requirements for invalidating RXDMA serial: sh-sci: protect invalidating RXDMA on shutdown tty: add the option to have a tty reject a new ldisc serial: core: Call device_set_awake_path() for console port dt-bindings: serial: brcm,bcm2835-aux-uart: convert to dtschema tty: serial: uartps: Add support for uartps controller reset arm64: zynqmp: Add resets property for UART nodes dt-bindings: serial: cdns,uart: Add optional reset property serial: 8250_pnp: Switch to DEFINE_SIMPLE_DEV_PM_OPS() serial: 8250_exar: Keep the includes sorted serial: 8250_exar: Make type of bit the same in exar_ee_*_bit() serial: 8250_exar: Use BIT() in exar_ee_read() serial: 8250_exar: Switch to use dev_err_probe() serial: 8250_exar: Return directly from switch-cases serial: 8250_exar: Decrease indentation level ...
Diffstat (limited to 'drivers/tty/serial')
-rw-r--r--drivers/tty/serial/8250/8250_bcm7271.c14
-rw-r--r--drivers/tty/serial/8250/8250_core.c8
-rw-r--r--drivers/tty/serial/8250/8250_dma.c31
-rw-r--r--drivers/tty/serial/8250/8250_dw.c45
-rw-r--r--drivers/tty/serial/8250/8250_exar.c1051
-rw-r--r--drivers/tty/serial/8250/8250_mtk.c2
-rw-r--r--drivers/tty/serial/8250/8250_of.c37
-rw-r--r--drivers/tty/serial/8250/8250_omap.c49
-rw-r--r--drivers/tty/serial/8250/8250_pci1xxxx.c50
-rw-r--r--drivers/tty/serial/8250/8250_pnp.c65
-rw-r--r--drivers/tty/serial/8250/8250_port.c29
-rw-r--r--drivers/tty/serial/Kconfig54
-rw-r--r--drivers/tty/serial/Makefile2
-rw-r--r--drivers/tty/serial/amba-pl011.c62
-rw-r--r--drivers/tty/serial/ar933x_uart.c18
-rw-r--r--drivers/tty/serial/arc_uart.c8
-rw-r--r--drivers/tty/serial/atmel_serial.c150
-rw-r--r--drivers/tty/serial/clps711x.c12
-rw-r--r--drivers/tty/serial/cpm_uart.c20
-rw-r--r--drivers/tty/serial/digicolor-usart.c12
-rw-r--r--drivers/tty/serial/dz.c13
-rw-r--r--drivers/tty/serial/fsl_linflexuart.c17
-rw-r--r--drivers/tty/serial/fsl_lpuart.c45
-rw-r--r--drivers/tty/serial/icom.c25
-rw-r--r--drivers/tty/serial/imx.c63
-rw-r--r--drivers/tty/serial/ip22zilog.c26
-rw-r--r--drivers/tty/serial/jsm/jsm_cls.c29
-rw-r--r--drivers/tty/serial/jsm/jsm_neo.c38
-rw-r--r--drivers/tty/serial/max3100.c340
-rw-r--r--drivers/tty/serial/max310x.c39
-rw-r--r--drivers/tty/serial/men_z135_uart.c26
-rw-r--r--drivers/tty/serial/meson_uart.c12
-rw-r--r--drivers/tty/serial/milbeaut_usio.c15
-rw-r--r--drivers/tty/serial/msm_serial.c122
-rw-r--r--drivers/tty/serial/mvebu-uart.c8
-rw-r--r--drivers/tty/serial/mxs-auart.c23
-rw-r--r--drivers/tty/serial/omap-serial.c1
-rw-r--r--drivers/tty/serial/pch_uart.c21
-rw-r--r--drivers/tty/serial/pic32_uart.c17
-rw-r--r--drivers/tty/serial/pmac_zilog.c33
-rw-r--r--drivers/tty/serial/qcom_geni_serial.c34
-rw-r--r--drivers/tty/serial/rda-uart.c17
-rw-r--r--drivers/tty/serial/samsung_tty.c54
-rw-r--r--drivers/tty/serial/sb1250-duart.c13
-rw-r--r--drivers/tty/serial/sc16is7xx.c303
-rw-r--r--drivers/tty/serial/sc16is7xx.h41
-rw-r--r--drivers/tty/serial/sc16is7xx_i2c.c67
-rw-r--r--drivers/tty/serial/sc16is7xx_spi.c90
-rw-r--r--drivers/tty/serial/sccnxp.c16
-rw-r--r--drivers/tty/serial/serial-tegra.c43
-rw-r--r--drivers/tty/serial/serial_base.h30
-rw-r--r--drivers/tty/serial/serial_base_bus.c129
-rw-r--r--drivers/tty/serial/serial_core.c154
-rw-r--r--drivers/tty/serial/serial_port.c9
-rw-r--r--drivers/tty/serial/sh-sci.c68
-rw-r--r--drivers/tty/serial/sifive.c4
-rw-r--r--drivers/tty/serial/sprd_serial.c20
-rw-r--r--drivers/tty/serial/st-asc.c4
-rw-r--r--drivers/tty/serial/stm32-usart.c52
-rw-r--r--drivers/tty/serial/sunhv.c35
-rw-r--r--drivers/tty/serial/sunplus-uart.c16
-rw-r--r--drivers/tty/serial/sunsab.c30
-rw-r--r--drivers/tty/serial/sunsu.c15
-rw-r--r--drivers/tty/serial/sunzilog.c27
-rw-r--r--drivers/tty/serial/tegra-tcu.c10
-rw-r--r--drivers/tty/serial/timbuart.c17
-rw-r--r--drivers/tty/serial/uartlite.c13
-rw-r--r--drivers/tty/serial/ucc_uart.c20
-rw-r--r--drivers/tty/serial/xilinx_uartps.c35
-rw-r--r--drivers/tty/serial/zs.c13
70 files changed, 2474 insertions, 1537 deletions
diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c
index 5daa38d9c64e..de270863eb5e 100644
--- a/drivers/tty/serial/8250/8250_bcm7271.c
+++ b/drivers/tty/serial/8250/8250_bcm7271.c
@@ -413,20 +413,18 @@ static int stop_tx_dma(struct uart_8250_port *p)
static int brcmuart_tx_dma(struct uart_8250_port *p)
{
struct brcmuart_priv *priv = p->port.private_data;
- struct circ_buf *xmit = &p->port.state->xmit;
+ struct tty_port *tport = &p->port.state->port;
u32 tx_size;
if (uart_tx_stopped(&p->port) || priv->tx_running ||
- uart_circ_empty(xmit)) {
+ kfifo_is_empty(&tport->xmit_fifo)) {
return 0;
}
- tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
priv->dma.tx_err = 0;
- memcpy(priv->tx_buf, &xmit->buf[xmit->tail], tx_size);
- uart_xmit_advance(&p->port, tx_size);
+ tx_size = uart_fifo_out(&p->port, priv->tx_buf, UART_XMIT_SIZE);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&p->port);
udma_writel(priv, REGS_DMA_TX, UDMA_TX_TRANSFER_LEN, tx_size);
@@ -540,7 +538,7 @@ static void brcmuart_tx_isr(struct uart_port *up, u32 isr)
struct brcmuart_priv *priv = up->private_data;
struct device *dev = up->dev;
struct uart_8250_port *port_8250 = up_to_u8250p(up);
- struct circ_buf *xmit = &port_8250->port.state->xmit;
+ struct tty_port *tport = &port_8250->port.state->port;
if (isr & UDMA_INTR_TX_ABORT) {
if (priv->tx_running)
@@ -548,7 +546,7 @@ static void brcmuart_tx_isr(struct uart_port *up, u32 isr)
return;
}
priv->tx_running = false;
- if (!uart_circ_empty(xmit) && !uart_tx_stopped(up))
+ if (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(up))
brcmuart_tx_dma(port_8250);
}
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 2504e0455875..ff15022369e4 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -15,6 +15,7 @@
*/
#include <linux/acpi.h>
+#include <linux/cleanup.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/ioport.h>
@@ -41,6 +42,8 @@
#include <asm/irq.h>
+#include "../serial_base.h" /* For serial_base_add_isa_preferred_console() */
+
#include "8250.h"
/*
@@ -280,7 +283,8 @@ static void serial8250_backup_timeout(struct timer_list *t)
*/
lsr = serial_lsr_in(up);
if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
- (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) &&
+ (!kfifo_is_empty(&up->port.state->port.xmit_fifo) ||
+ up->port.x_char) &&
(lsr & UART_LSR_THRE)) {
iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
iir |= UART_IIR_THRI;
@@ -559,6 +563,8 @@ static void __init serial8250_isa_init_ports(void)
port->irqflags |= irqflag;
if (serial8250_isa_config != NULL)
serial8250_isa_config(i, &up->port, &up->capabilities);
+
+ serial_base_add_isa_preferred_console(serial8250_reg.dev_name, i);
}
}
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index 8b30ca8fdd3f..8a353e3cc3dd 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -15,7 +15,7 @@ static void __dma_tx_complete(void *param)
{
struct uart_8250_port *p = param;
struct uart_8250_dma *dma = p->dma;
- struct circ_buf *xmit = &p->port.state->xmit;
+ struct tty_port *tport = &p->port.state->port;
unsigned long flags;
int ret;
@@ -28,7 +28,7 @@ static void __dma_tx_complete(void *param)
uart_xmit_advance(&p->port, dma->tx_size);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&p->port);
ret = serial8250_tx_dma(p);
@@ -86,9 +86,10 @@ static void dma_rx_complete(void *param)
int serial8250_tx_dma(struct uart_8250_port *p)
{
struct uart_8250_dma *dma = p->dma;
- struct circ_buf *xmit = &p->port.state->xmit;
+ struct tty_port *tport = &p->port.state->port;
struct dma_async_tx_descriptor *desc;
struct uart_port *up = &p->port;
+ struct scatterlist sg;
int ret;
if (dma->tx_running) {
@@ -102,19 +103,27 @@ int serial8250_tx_dma(struct uart_8250_port *p)
uart_xchar_out(up, UART_TX);
}
- if (uart_tx_stopped(&p->port) || uart_circ_empty(xmit)) {
+ if (uart_tx_stopped(&p->port) || kfifo_is_empty(&tport->xmit_fifo)) {
/* We have been called from __dma_tx_complete() */
return 0;
}
- dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
-
serial8250_do_prepare_tx_dma(p);
- desc = dmaengine_prep_slave_single(dma->txchan,
- dma->tx_addr + xmit->tail,
- dma->tx_size, DMA_MEM_TO_DEV,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ sg_init_table(&sg, 1);
+ /* kfifo can do more than one sg, we don't (quite yet) */
+ ret = kfifo_dma_out_prepare_mapped(&tport->xmit_fifo, &sg, 1,
+ UART_XMIT_SIZE, dma->tx_addr);
+
+ /* we already checked empty fifo above, so there should be something */
+ if (WARN_ON_ONCE(ret != 1))
+ return 0;
+
+ dma->tx_size = sg_dma_len(&sg);
+
+ desc = dmaengine_prep_slave_sg(dma->txchan, &sg, 1,
+ DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
ret = -EBUSY;
goto err;
@@ -253,7 +262,7 @@ int serial8250_request_dma(struct uart_8250_port *p)
/* TX buffer */
dma->tx_addr = dma_map_single(dma->txchan->device->dev,
- p->port.state->xmit.buf,
+ p->port.state->port.xmit_buf,
UART_XMIT_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(dma->txchan->device->dev, dma->tx_addr)) {
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 1300c92b8702..ba9f4dc4e71d 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -100,14 +100,18 @@ static void dw8250_force_idle(struct uart_port *p)
(void)p->serial_in(p, UART_RX);
}
-static void dw8250_check_lcr(struct uart_port *p, int value)
+static void dw8250_check_lcr(struct uart_port *p, int offset, int value)
{
- void __iomem *offset = p->membase + (UART_LCR << p->regshift);
+ struct dw8250_data *d = to_dw8250_data(p->private_data);
+ void __iomem *addr = p->membase + (offset << p->regshift);
int tries = 1000;
+ if (offset != UART_LCR || d->uart_16550_compatible)
+ return;
+
/* Make sure LCR write wasn't ignored */
while (tries--) {
- unsigned int lcr = p->serial_in(p, UART_LCR);
+ unsigned int lcr = p->serial_in(p, offset);
if ((value & ~UART_LCR_SPAR) == (lcr & ~UART_LCR_SPAR))
return;
@@ -116,15 +120,15 @@ static void dw8250_check_lcr(struct uart_port *p, int value)
#ifdef CONFIG_64BIT
if (p->type == PORT_OCTEON)
- __raw_writeq(value & 0xff, offset);
+ __raw_writeq(value & 0xff, addr);
else
#endif
if (p->iotype == UPIO_MEM32)
- writel(value, offset);
+ writel(value, addr);
else if (p->iotype == UPIO_MEM32BE)
- iowrite32be(value, offset);
+ iowrite32be(value, addr);
else
- writeb(value, offset);
+ writeb(value, addr);
}
/*
* FIXME: this deadlocks if port->lock is already held
@@ -158,12 +162,8 @@ static void dw8250_tx_wait_empty(struct uart_port *p)
static void dw8250_serial_out(struct uart_port *p, int offset, int value)
{
- struct dw8250_data *d = to_dw8250_data(p->private_data);
-
writeb(value, p->membase + (offset << p->regshift));
-
- if (offset == UART_LCR && !d->uart_16550_compatible)
- dw8250_check_lcr(p, value);
+ dw8250_check_lcr(p, offset, value);
}
static void dw8250_serial_out38x(struct uart_port *p, int offset, int value)
@@ -185,35 +185,26 @@ static unsigned int dw8250_serial_in(struct uart_port *p, int offset)
#ifdef CONFIG_64BIT
static unsigned int dw8250_serial_inq(struct uart_port *p, int offset)
{
- unsigned int value;
-
- value = (u8)__raw_readq(p->membase + (offset << p->regshift));
+ u8 value = __raw_readq(p->membase + (offset << p->regshift));
return dw8250_modify_msr(p, offset, value);
}
static void dw8250_serial_outq(struct uart_port *p, int offset, int value)
{
- struct dw8250_data *d = to_dw8250_data(p->private_data);
-
value &= 0xff;
__raw_writeq(value, p->membase + (offset << p->regshift));
/* Read back to ensure register write ordering. */
__raw_readq(p->membase + (UART_LCR << p->regshift));
- if (offset == UART_LCR && !d->uart_16550_compatible)
- dw8250_check_lcr(p, value);
+ dw8250_check_lcr(p, offset, value);
}
#endif /* CONFIG_64BIT */
static void dw8250_serial_out32(struct uart_port *p, int offset, int value)
{
- struct dw8250_data *d = to_dw8250_data(p->private_data);
-
writel(value, p->membase + (offset << p->regshift));
-
- if (offset == UART_LCR && !d->uart_16550_compatible)
- dw8250_check_lcr(p, value);
+ dw8250_check_lcr(p, offset, value);
}
static unsigned int dw8250_serial_in32(struct uart_port *p, int offset)
@@ -225,12 +216,8 @@ static unsigned int dw8250_serial_in32(struct uart_port *p, int offset)
static void dw8250_serial_out32be(struct uart_port *p, int offset, int value)
{
- struct dw8250_data *d = to_dw8250_data(p->private_data);
-
iowrite32be(value, p->membase + (offset << p->regshift));
-
- if (offset == UART_LCR && !d->uart_16550_compatible)
- dw8250_check_lcr(p, value);
+ dw8250_check_lcr(p, offset, value);
}
static unsigned int dw8250_serial_in32be(struct uart_port *p, int offset)
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index 0440df7de1ed..616128254bbd 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -6,6 +6,7 @@
*
* Copyright (C) 2017 Sudip Mukherjee, All Rights Reserved.
*/
+#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/device.h>
@@ -46,8 +47,50 @@
#define PCI_DEVICE_ID_COMMTECH_4228PCIE 0x0021
#define PCI_DEVICE_ID_COMMTECH_4222PCIE 0x0022
+#define PCI_VENDOR_ID_CONNECT_TECH 0x12c4
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_SP_OPTO 0x0340
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_A 0x0341
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_B 0x0342
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS 0x0350
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_A 0x0351
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_B 0x0352
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS 0x0353
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_A 0x0354
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_B 0x0355
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS_OPTO 0x0360
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_A 0x0361
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_B 0x0362
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP 0x0370
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232 0x0371
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485 0x0372
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP 0x0373
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP 0x0374
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP 0x0375
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232_NS 0x0376
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT 0x0380
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT 0x0381
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO 0x0382
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO 0x0392
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP 0x03A0
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232 0x03A1
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485 0x03A2
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232_NS 0x03A3
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XEG001 0x0602
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_BASE 0x1000
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_2 0x1002
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_4 0x1004
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_8 0x1008
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_12 0x100C
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_16 0x1010
+#define PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG00X 0x110c
+#define PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG01X 0x110d
+#define PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_16 0x1110
+
#define PCI_DEVICE_ID_EXAR_XR17V4358 0x4358
#define PCI_DEVICE_ID_EXAR_XR17V8358 0x8358
+#define PCI_DEVICE_ID_EXAR_XR17V252 0x0252
+#define PCI_DEVICE_ID_EXAR_XR17V254 0x0254
+#define PCI_DEVICE_ID_EXAR_XR17V258 0x0258
#define PCI_SUBDEVICE_ID_USR_2980 0x0128
#define PCI_SUBDEVICE_ID_USR_2981 0x0129
@@ -86,12 +129,25 @@
#define UART_EXAR_DLD 0x02 /* Divisor Fractional */
#define UART_EXAR_DLD_485_POLARITY 0x80 /* RS-485 Enable Signal Polarity */
+/* EEPROM registers */
+#define UART_EXAR_REGB 0x8e
+#define UART_EXAR_REGB_EECK BIT(4)
+#define UART_EXAR_REGB_EECS BIT(5)
+#define UART_EXAR_REGB_EEDI BIT(6)
+#define UART_EXAR_REGB_EEDO BIT(7)
+#define UART_EXAR_REGB_EE_ADDR_SIZE 6
+#define UART_EXAR_REGB_EE_DATA_SIZE 16
+
+#define UART_EXAR_XR17C15X_PORT_OFFSET 0x200
+#define UART_EXAR_XR17V25X_PORT_OFFSET 0x200
+#define UART_EXAR_XR17V35X_PORT_OFFSET 0x400
+
/*
* IOT2040 MPIO wiring semantics:
*
* MPIO Port Function
* ---- ---- --------
- * 0 2 Mode bit 0
+ * 0 2 Mode bit 0
* 1 2 Mode bit 1
* 2 2 Terminate bus
* 3 - <reserved>
@@ -121,38 +177,300 @@
#define IOT2040_UARTS_ENABLE 0x03
#define IOT2040_UARTS_GPIO_HI_MODE 0xF8 /* enable & LED as outputs */
+/* CTI EEPROM offsets */
+#define CTI_EE_OFF_XR17C15X_OSC_FREQ 0x04 /* 2 words */
+#define CTI_EE_OFF_XR17V25X_OSC_FREQ 0x08 /* 2 words */
+#define CTI_EE_OFF_XR17C15X_PART_NUM 0x0A /* 4 words */
+#define CTI_EE_OFF_XR17V25X_PART_NUM 0x0E /* 4 words */
+#define CTI_EE_OFF_XR17C15X_SERIAL_NUM 0x0E /* 1 word */
+#define CTI_EE_OFF_XR17V25X_SERIAL_NUM 0x12 /* 1 word */
+#define CTI_EE_OFF_XR17V35X_SERIAL_NUM 0x11 /* 2 word */
+#define CTI_EE_OFF_XR17V35X_BRD_FLAGS 0x13 /* 1 word */
+#define CTI_EE_OFF_XR17V35X_PORT_FLAGS 0x14 /* 1 word */
+
+#define CTI_EE_MASK_PORT_FLAGS_TYPE GENMASK(7, 0)
+#define CTI_EE_MASK_OSC_FREQ_LOWER GENMASK(15, 0)
+#define CTI_EE_MASK_OSC_FREQ_UPPER GENMASK(31, 16)
+
+#define CTI_FPGA_RS485_IO_REG 0x2008
+#define CTI_FPGA_CFG_INT_EN_REG 0x48
+#define CTI_FPGA_CFG_INT_EN_EXT_BIT BIT(15) /* External int enable bit */
+
+#define CTI_DEFAULT_PCI_OSC_FREQ 29491200
+#define CTI_DEFAULT_PCIE_OSC_FREQ 125000000
+#define CTI_DEFAULT_FPGA_OSC_FREQ 33333333
+
+/*
+ * CTI Serial port line types. These match the values stored in the first
+ * nibble of the CTI EEPROM port_flags word.
+ */
+enum cti_port_type {
+ CTI_PORT_TYPE_NONE = 0,
+ CTI_PORT_TYPE_RS232, // RS232 ONLY
+ CTI_PORT_TYPE_RS422_485, // RS422/RS485 ONLY
+ CTI_PORT_TYPE_RS232_422_485_HW, // RS232/422/485 HW ONLY Switchable
+ CTI_PORT_TYPE_RS232_422_485_SW, // RS232/422/485 SW ONLY Switchable
+ CTI_PORT_TYPE_RS232_422_485_4B, // RS232/422/485 HW/SW (4bit ex. BCG004)
+ CTI_PORT_TYPE_RS232_422_485_2B, // RS232/422/485 HW/SW (2bit ex. BBG008)
+ CTI_PORT_TYPE_MAX,
+};
+
+#define CTI_PORT_TYPE_VALID(_port_type) \
+ (((_port_type) > CTI_PORT_TYPE_NONE) && \
+ ((_port_type) < CTI_PORT_TYPE_MAX))
+
+#define CTI_PORT_TYPE_RS485(_port_type) \
+ (((_port_type) > CTI_PORT_TYPE_RS232) && \
+ ((_port_type) < CTI_PORT_TYPE_MAX))
+
struct exar8250;
struct exar8250_platform {
int (*rs485_config)(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485);
const struct serial_rs485 *rs485_supported;
- int (*register_gpio)(struct pci_dev *, struct uart_8250_port *);
- void (*unregister_gpio)(struct uart_8250_port *);
+ int (*register_gpio)(struct pci_dev *pcidev, struct uart_8250_port *port);
+ void (*unregister_gpio)(struct uart_8250_port *port);
};
/**
* struct exar8250_board - board information
* @num_ports: number of serial ports
* @reg_shift: describes UART register mapping in PCI memory
- * @setup: quirk run at ->probe() stage
+ * @setup: quirk run at ->probe() stage for each port
* @exit: quirk run at ->remove() stage
*/
struct exar8250_board {
unsigned int num_ports;
unsigned int reg_shift;
- int (*setup)(struct exar8250 *, struct pci_dev *,
- struct uart_8250_port *, int);
+ int (*setup)(struct exar8250 *priv, struct pci_dev *pcidev,
+ struct uart_8250_port *port, int idx);
void (*exit)(struct pci_dev *pcidev);
};
struct exar8250 {
unsigned int nr;
+ unsigned int osc_freq;
struct exar8250_board *board;
void __iomem *virt;
int line[];
};
+static inline void exar_write_reg(struct exar8250 *priv,
+ unsigned int reg, u8 value)
+{
+ writeb(value, priv->virt + reg);
+}
+
+static inline u8 exar_read_reg(struct exar8250 *priv, unsigned int reg)
+{
+ return readb(priv->virt + reg);
+}
+
+static inline void exar_ee_select(struct exar8250 *priv)
+{
+ // Set chip select pin high to enable EEPROM reads/writes
+ exar_write_reg(priv, UART_EXAR_REGB, UART_EXAR_REGB_EECS);
+ // Min ~500ns delay needed between CS assert and EEPROM access
+ udelay(1);
+}
+
+static inline void exar_ee_deselect(struct exar8250 *priv)
+{
+ exar_write_reg(priv, UART_EXAR_REGB, 0x00);
+}
+
+static inline void exar_ee_write_bit(struct exar8250 *priv, u8 bit)
+{
+ u8 value = UART_EXAR_REGB_EECS;
+
+ if (bit)
+ value |= UART_EXAR_REGB_EEDI;
+
+ // Clock out the bit on the EEPROM interface
+ exar_write_reg(priv, UART_EXAR_REGB, value);
+ // 2us delay = ~500khz clock speed
+ udelay(2);
+
+ value |= UART_EXAR_REGB_EECK;
+
+ exar_write_reg(priv, UART_EXAR_REGB, value);
+ udelay(2);
+}
+
+static inline u8 exar_ee_read_bit(struct exar8250 *priv)
+{
+ u8 regb;
+ u8 value = UART_EXAR_REGB_EECS;
+
+ // Clock in the bit on the EEPROM interface
+ exar_write_reg(priv, UART_EXAR_REGB, value);
+ // 2us delay = ~500khz clock speed
+ udelay(2);
+
+ value |= UART_EXAR_REGB_EECK;
+
+ exar_write_reg(priv, UART_EXAR_REGB, value);
+ udelay(2);
+
+ regb = exar_read_reg(priv, UART_EXAR_REGB);
+
+ return (regb & UART_EXAR_REGB_EEDO ? 1 : 0);
+}
+
+/**
+ * exar_ee_read() - Read a word from the EEPROM
+ * @priv: Device's private structure
+ * @ee_addr: Offset of EEPROM to read word from
+ *
+ * Read a single 16bit word from an Exar UART's EEPROM.
+ * The type of the EEPROM is AT93C46D.
+ *
+ * Return: EEPROM word
+ */
+static u16 exar_ee_read(struct exar8250 *priv, u8 ee_addr)
+{
+ int i;
+ u16 data = 0;
+
+ exar_ee_select(priv);
+
+ // Send read command (opcode 110)
+ exar_ee_write_bit(priv, 1);
+ exar_ee_write_bit(priv, 1);
+ exar_ee_write_bit(priv, 0);
+
+ // Send address to read from
+ for (i = UART_EXAR_REGB_EE_ADDR_SIZE - 1; i >= 0; i--)
+ exar_ee_write_bit(priv, ee_addr & BIT(i));
+
+ // Read data 1 bit at a time starting with a dummy bit
+ for (i = UART_EXAR_REGB_EE_DATA_SIZE; i >= 0; i--) {
+ if (exar_ee_read_bit(priv))
+ data |= BIT(i);
+ }
+
+ exar_ee_deselect(priv);
+
+ return data;
+}
+
+/**
+ * exar_mpio_config_output() - Configure an Exar MPIO as an output
+ * @priv: Device's private structure
+ * @mpio_num: MPIO number/offset to configure
+ *
+ * Configure a single MPIO as an output and disable tristate. It is reccomended
+ * to set the level with exar_mpio_set_high()/exar_mpio_set_low() prior to
+ * calling this function to ensure default MPIO pin state.
+ *
+ * Return: 0 on success, negative error code on failure
+ */
+static int exar_mpio_config_output(struct exar8250 *priv,
+ unsigned int mpio_num)
+{
+ unsigned int mpio_offset;
+ u8 sel_reg; // MPIO Select register (input/output)
+ u8 tri_reg; // MPIO Tristate register
+ u8 value;
+
+ if (mpio_num < 8) {
+ sel_reg = UART_EXAR_MPIOSEL_7_0;
+ tri_reg = UART_EXAR_MPIO3T_7_0;
+ mpio_offset = mpio_num;
+ } else if (mpio_num >= 8 && mpio_num < 16) {
+ sel_reg = UART_EXAR_MPIOSEL_15_8;
+ tri_reg = UART_EXAR_MPIO3T_15_8;
+ mpio_offset = mpio_num - 8;
+ } else {
+ return -EINVAL;
+ }
+
+ // Disable MPIO pin tri-state
+ value = exar_read_reg(priv, tri_reg);
+ value &= ~BIT(mpio_offset);
+ exar_write_reg(priv, tri_reg, value);
+
+ value = exar_read_reg(priv, sel_reg);
+ value &= ~BIT(mpio_offset);
+ exar_write_reg(priv, sel_reg, value);
+
+ return 0;
+}
+
+/**
+ * _exar_mpio_set() - Set an Exar MPIO output high or low
+ * @priv: Device's private structure
+ * @mpio_num: MPIO number/offset to set
+ * @high: Set MPIO high if true, low if false
+ *
+ * Set a single MPIO high or low. exar_mpio_config_output() must also be called
+ * to configure the pin as an output.
+ *
+ * Return: 0 on success, negative error code on failure
+ */
+static int _exar_mpio_set(struct exar8250 *priv,
+ unsigned int mpio_num, bool high)
+{
+ unsigned int mpio_offset;
+ u8 lvl_reg;
+ u8 value;
+
+ if (mpio_num < 8) {
+ lvl_reg = UART_EXAR_MPIOLVL_7_0;
+ mpio_offset = mpio_num;
+ } else if (mpio_num >= 8 && mpio_num < 16) {
+ lvl_reg = UART_EXAR_MPIOLVL_15_8;
+ mpio_offset = mpio_num - 8;
+ } else {
+ return -EINVAL;
+ }
+
+ value = exar_read_reg(priv, lvl_reg);
+ if (high)
+ value |= BIT(mpio_offset);
+ else
+ value &= ~BIT(mpio_offset);
+ exar_write_reg(priv, lvl_reg, value);
+
+ return 0;
+}
+
+static int exar_mpio_set_low(struct exar8250 *priv, unsigned int mpio_num)
+{
+ return _exar_mpio_set(priv, mpio_num, false);
+}
+
+static int exar_mpio_set_high(struct exar8250 *priv, unsigned int mpio_num)
+{
+ return _exar_mpio_set(priv, mpio_num, true);
+}
+
+static int generic_rs485_config(struct uart_port *port, struct ktermios *termios,
+ struct serial_rs485 *rs485)
+{
+ bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED);
+ u8 __iomem *p = port->membase;
+ u8 value;
+
+ value = readb(p + UART_EXAR_FCTR);
+ if (is_rs485)
+ value |= UART_FCTR_EXAR_485;
+ else
+ value &= ~UART_FCTR_EXAR_485;
+
+ writeb(value, p + UART_EXAR_FCTR);
+
+ if (is_rs485)
+ writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR);
+
+ return 0;
+}
+
+static const struct serial_rs485 generic_rs485_supported = {
+ .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND,
+};
+
static void exar_pm(struct uart_port *port, unsigned int state, unsigned int old)
{
/*
@@ -214,7 +532,7 @@ static void exar_shutdown(struct uart_port *port)
{
bool tx_complete = false;
struct uart_8250_port *up = up_to_u8250p(port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
int i = 0;
u16 lsr;
@@ -225,7 +543,8 @@ static void exar_shutdown(struct uart_port *port)
else
tx_complete = false;
usleep_range(1000, 1100);
- } while (!uart_circ_empty(xmit) && !tx_complete && i++ < 1000);
+ } while (!kfifo_is_empty(&tport->xmit_fifo) &&
+ !tx_complete && i++ < 1000);
serial8250_do_shutdown(port);
}
@@ -289,41 +608,546 @@ pci_fastcom335_setup(struct exar8250 *priv, struct pci_dev *pcidev,
writeb(32, p + UART_EXAR_TXTRG);
writeb(32, p + UART_EXAR_RXTRG);
+ /* Skip the initial (per device) setup */
+ if (idx)
+ return 0;
+
/*
* Setup Multipurpose Input/Output pins.
*/
+ switch (pcidev->device) {
+ case PCI_DEVICE_ID_COMMTECH_4222PCI335:
+ case PCI_DEVICE_ID_COMMTECH_4224PCI335:
+ writeb(0x78, p + UART_EXAR_MPIOLVL_7_0);
+ writeb(0x00, p + UART_EXAR_MPIOINV_7_0);
+ writeb(0x00, p + UART_EXAR_MPIOSEL_7_0);
+ break;
+ case PCI_DEVICE_ID_COMMTECH_2324PCI335:
+ case PCI_DEVICE_ID_COMMTECH_2328PCI335:
+ writeb(0x00, p + UART_EXAR_MPIOLVL_7_0);
+ writeb(0xc0, p + UART_EXAR_MPIOINV_7_0);
+ writeb(0xc0, p + UART_EXAR_MPIOSEL_7_0);
+ break;
+ default:
+ break;
+ }
+ writeb(0x00, p + UART_EXAR_MPIOINT_7_0);
+ writeb(0x00, p + UART_EXAR_MPIO3T_7_0);
+ writeb(0x00, p + UART_EXAR_MPIOOD_7_0);
+
+ return 0;
+}
+
+/**
+ * cti_tristate_disable() - Disable RS485 transciever tristate
+ * @priv: Device's private structure
+ * @port_num: Port number to set tristate off
+ *
+ * Most RS485 capable cards have a power on tristate jumper/switch that ensures
+ * the RS422/RS485 transceiver does not drive a multi-drop RS485 bus when it is
+ * not the master. When this jumper is installed the user must set the RS485
+ * mode to Full or Half duplex to disable tristate prior to using the port.
+ *
+ * Some Exar UARTs have an auto-tristate feature while others require setting
+ * an MPIO to disable the tristate.
+ *
+ * Return: 0 on success, negative error code on failure
+ */
+static int cti_tristate_disable(struct exar8250 *priv, unsigned int port_num)
+{
+ int ret;
+
+ ret = exar_mpio_set_high(priv, port_num);
+ if (ret)
+ return ret;
+
+ return exar_mpio_config_output(priv, port_num);
+}
+
+/**
+ * cti_plx_int_enable() - Enable UART interrupts to PLX bridge
+ * @priv: Device's private structure
+ *
+ * Some older CTI cards require MPIO_0 to be set low to enable the
+ * interrupts from the UART to the PLX PCI->PCIe bridge.
+ *
+ * Return: 0 on success, negative error code on failure
+ */
+static int cti_plx_int_enable(struct exar8250 *priv)
+{
+ int ret;
+
+ ret = exar_mpio_set_low(priv, 0);
+ if (ret)
+ return ret;
+
+ return exar_mpio_config_output(priv, 0);
+}
+
+/**
+ * cti_read_osc_freq() - Read the UART oscillator frequency from EEPROM
+ * @priv: Device's private structure
+ * @eeprom_offset: Offset where the oscillator frequency is stored
+ *
+ * CTI XR17x15X and XR17V25X cards have the serial boards oscillator frequency
+ * stored in the EEPROM. FPGA and XR17V35X based cards use the PCI/PCIe clock.
+ *
+ * Return: frequency on success, negative error code on failure
+ */
+static int cti_read_osc_freq(struct exar8250 *priv, u8 eeprom_offset)
+{
+ u16 lower_word;
+ u16 upper_word;
+
+ lower_word = exar_ee_read(priv, eeprom_offset);
+ // Check if EEPROM word was blank
+ if (lower_word == 0xFFFF)
+ return -EIO;
+
+ upper_word = exar_ee_read(priv, (eeprom_offset + 1));
+ if (upper_word == 0xFFFF)
+ return -EIO;
+
+ return FIELD_PREP(CTI_EE_MASK_OSC_FREQ_LOWER, lower_word) |
+ FIELD_PREP(CTI_EE_MASK_OSC_FREQ_UPPER, upper_word);
+}
+
+/**
+ * cti_get_port_type_xr17c15x_xr17v25x() - Get port type of xr17c15x/xr17v25x
+ * @priv: Device's private structure
+ * @pcidev: Pointer to the PCI device for this port
+ * @port_num: Port to get type of
+ *
+ * CTI xr17c15x and xr17v25x based cards port types are based on PCI IDs.
+ *
+ * Return: port type on success, CTI_PORT_TYPE_NONE on failure
+ */
+static enum cti_port_type cti_get_port_type_xr17c15x_xr17v25x(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ unsigned int port_num)
+{
+ switch (pcidev->subsystem_device) {
+ // RS232 only cards
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_232:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_232:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_232:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232_NS:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232_NS:
+ return CTI_PORT_TYPE_RS232;
+ // 1x RS232, 1x RS422/RS485
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_1_1:
+ return (port_num == 0) ? CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
+ // 2x RS232, 2x RS422/RS485
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_2:
+ return (port_num < 2) ? CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
+ // 4x RS232, 4x RS422/RS485
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP:
+ return (port_num < 4) ? CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
+ // RS232/RS422/RS485 HW (jumper) selectable
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_SP_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_B:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_B:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_B:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_B:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP:
+ return CTI_PORT_TYPE_RS232_422_485_HW;
+ // RS422/RS485 HW (jumper) selectable
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485:
+ return CTI_PORT_TYPE_RS422_485;
+ // 6x RS232, 2x RS422/RS485
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP:
+ return (port_num < 6) ? CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
+ // 2x RS232, 6x RS422/RS485
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP:
+ return (port_num < 2) ? CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
+ default:
+ dev_err(&pcidev->dev, "unknown/unsupported device\n");
+ return CTI_PORT_TYPE_NONE;
+ }
+}
+
+/**
+ * cti_get_port_type_fpga() - Get the port type of a CTI FPGA card
+ * @priv: Device's private structure
+ * @pcidev: Pointer to the PCI device for this port
+ * @port_num: Port to get type of
+ *
+ * FPGA based cards port types are based on PCI IDs.
+ *
+ * Return: port type on success, CTI_PORT_TYPE_NONE on failure
+ */
+static enum cti_port_type cti_get_port_type_fpga(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ unsigned int port_num)
+{
+ switch (pcidev->device) {
+ case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG00X:
+ case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG01X:
+ case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_16:
+ return CTI_PORT_TYPE_RS232_422_485_HW;
+ default:
+ dev_err(&pcidev->dev, "unknown/unsupported device\n");
+ return CTI_PORT_TYPE_NONE;
+ }
+}
+
+/**
+ * cti_get_port_type_xr17v35x() - Read port type from the EEPROM
+ * @priv: Device's private structure
+ * @pcidev: Pointer to the PCI device for this port
+ * @port_num: port offset
+ *
+ * CTI XR17V35X based cards have the port types stored in the EEPROM.
+ * This function reads the port type for a single port.
+ *
+ * Return: port type on success, CTI_PORT_TYPE_NONE on failure
+ */
+static enum cti_port_type cti_get_port_type_xr17v35x(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ unsigned int port_num)
+{
+ enum cti_port_type port_type;
+ u16 port_flags;
+ u8 offset;
+
+ offset = CTI_EE_OFF_XR17V35X_PORT_FLAGS + port_num;
+ port_flags = exar_ee_read(priv, offset);
+
+ port_type = FIELD_GET(CTI_EE_MASK_PORT_FLAGS_TYPE, port_flags);
+ if (CTI_PORT_TYPE_VALID(port_type))
+ return port_type;
+
+ /*
+ * If the port type is missing the card assume it is a
+ * RS232/RS422/RS485 card to be safe.
+ *
+ * There is one known board (BEG013) that only has 3 of 4 port types
+ * written to the EEPROM so this acts as a work around.
+ */
+ dev_warn(&pcidev->dev, "failed to get port %d type from EEPROM\n", port_num);
+
+ return CTI_PORT_TYPE_RS232_422_485_HW;
+}
+
+static int cti_rs485_config_mpio_tristate(struct uart_port *port,
+ struct ktermios *termios,
+ struct serial_rs485 *rs485)
+{
+ struct exar8250 *priv = (struct exar8250 *)port->private_data;
+ int ret;
+
+ ret = generic_rs485_config(port, termios, rs485);
+ if (ret)
+ return ret;
+
+ // Disable power-on RS485 tri-state via MPIO
+ return cti_tristate_disable(priv, port->port_id);
+}
+
+static void cti_board_init_osc_freq(struct exar8250 *priv, struct pci_dev *pcidev, u8 eeprom_offset)
+{
+ int osc_freq;
+
+ osc_freq = cti_read_osc_freq(priv, eeprom_offset);
+ if (osc_freq <= 0) {
+ dev_warn(&pcidev->dev, "failed to read OSC freq from EEPROM, using default\n");
+ osc_freq = CTI_DEFAULT_PCI_OSC_FREQ;
+ }
+
+ priv->osc_freq = osc_freq;
+}
+
+static int cti_port_setup_common(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ int idx, unsigned int offset,
+ struct uart_8250_port *port)
+{
+ int ret;
+
+ port->port.port_id = idx;
+ port->port.uartclk = priv->osc_freq;
+
+ ret = serial8250_pci_setup_port(pcidev, port, 0, offset, 0);
+ if (ret)
+ return ret;
+
+ port->port.private_data = (void *)priv;
+ port->port.pm = exar_pm;
+ port->port.shutdown = exar_shutdown;
+
+ return 0;
+}
+
+static int cti_board_init_fpga(struct exar8250 *priv, struct pci_dev *pcidev)
+{
+ int ret;
+ u16 cfg_val;
+
+ // FPGA OSC is fixed to the 33MHz PCI clock
+ priv->osc_freq = CTI_DEFAULT_FPGA_OSC_FREQ;
+
+ // Enable external interrupts in special cfg space register
+ ret = pci_read_config_word(pcidev, CTI_FPGA_CFG_INT_EN_REG, &cfg_val);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ cfg_val |= CTI_FPGA_CFG_INT_EN_EXT_BIT;
+ ret = pci_write_config_word(pcidev, CTI_FPGA_CFG_INT_EN_REG, cfg_val);
+ if (ret)
+ return pcibios_err_to_errno(ret);
+
+ // RS485 gate needs to be enabled; otherwise RTS/CTS will not work
+ exar_write_reg(priv, CTI_FPGA_RS485_IO_REG, 0x01);
+
+ return 0;
+}
+
+static int cti_port_setup_fpga(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ struct uart_8250_port *port,
+ int idx)
+{
+ enum cti_port_type port_type;
+ unsigned int offset;
+ int ret;
+
if (idx == 0) {
- switch (pcidev->device) {
- case PCI_DEVICE_ID_COMMTECH_4222PCI335:
- case PCI_DEVICE_ID_COMMTECH_4224PCI335:
- writeb(0x78, p + UART_EXAR_MPIOLVL_7_0);
- writeb(0x00, p + UART_EXAR_MPIOINV_7_0);
- writeb(0x00, p + UART_EXAR_MPIOSEL_7_0);
+ ret = cti_board_init_fpga(priv, pcidev);
+ if (ret)
+ return ret;
+ }
+
+ port_type = cti_get_port_type_fpga(priv, pcidev, idx);
+
+ // FPGA shares port offsets with XR17C15X
+ offset = idx * UART_EXAR_XR17C15X_PORT_OFFSET;
+ port->port.type = PORT_XR17D15X;
+
+ port->port.get_divisor = xr17v35x_get_divisor;
+ port->port.set_divisor = xr17v35x_set_divisor;
+ port->port.startup = xr17v35x_startup;
+
+ if (CTI_PORT_TYPE_RS485(port_type)) {
+ port->port.rs485_config = generic_rs485_config;
+ port->port.rs485_supported = generic_rs485_supported;
+ }
+
+ return cti_port_setup_common(priv, pcidev, idx, offset, port);
+}
+
+static void cti_board_init_xr17v35x(struct exar8250 *priv, struct pci_dev *pcidev)
+{
+ // XR17V35X uses the PCIe clock rather than an oscillator
+ priv->osc_freq = CTI_DEFAULT_PCIE_OSC_FREQ;
+}
+
+static int cti_port_setup_xr17v35x(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ struct uart_8250_port *port,
+ int idx)
+{
+ enum cti_port_type port_type;
+ unsigned int offset;
+ int ret;
+
+ if (idx == 0)
+ cti_board_init_xr17v35x(priv, pcidev);
+
+ port_type = cti_get_port_type_xr17v35x(priv, pcidev, idx);
+
+ offset = idx * UART_EXAR_XR17V35X_PORT_OFFSET;
+ port->port.type = PORT_XR17V35X;
+
+ port->port.get_divisor = xr17v35x_get_divisor;
+ port->port.set_divisor = xr17v35x_set_divisor;
+ port->port.startup = xr17v35x_startup;
+
+ switch (port_type) {
+ case CTI_PORT_TYPE_RS422_485:
+ case CTI_PORT_TYPE_RS232_422_485_HW:
+ port->port.rs485_config = cti_rs485_config_mpio_tristate;
+ port->port.rs485_supported = generic_rs485_supported;
+ break;
+ case CTI_PORT_TYPE_RS232_422_485_SW:
+ case CTI_PORT_TYPE_RS232_422_485_4B:
+ case CTI_PORT_TYPE_RS232_422_485_2B:
+ port->port.rs485_config = generic_rs485_config;
+ port->port.rs485_supported = generic_rs485_supported;
+ break;
+ default:
+ break;
+ }
+
+ ret = cti_port_setup_common(priv, pcidev, idx, offset, port);
+ if (ret)
+ return ret;
+
+ exar_write_reg(priv, (offset + UART_EXAR_8XMODE), 0x00);
+ exar_write_reg(priv, (offset + UART_EXAR_FCTR), UART_FCTR_EXAR_TRGD);
+ exar_write_reg(priv, (offset + UART_EXAR_TXTRG), 128);
+ exar_write_reg(priv, (offset + UART_EXAR_RXTRG), 128);
+
+ return 0;
+}
+
+static void cti_board_init_xr17v25x(struct exar8250 *priv, struct pci_dev *pcidev)
+{
+ cti_board_init_osc_freq(priv, pcidev, CTI_EE_OFF_XR17V25X_OSC_FREQ);
+
+ /* enable interrupts on cards that need the "PLX fix" */
+ switch (pcidev->subsystem_device) {
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_B:
+ cti_plx_int_enable(priv);
+ break;
+ default:
+ break;
+ }
+}
+
+static int cti_port_setup_xr17v25x(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ struct uart_8250_port *port,
+ int idx)
+{
+ enum cti_port_type port_type;
+ unsigned int offset;
+ int ret;
+
+ if (idx == 0)
+ cti_board_init_xr17v25x(priv, pcidev);
+
+ port_type = cti_get_port_type_xr17c15x_xr17v25x(priv, pcidev, idx);
+
+ offset = idx * UART_EXAR_XR17V25X_PORT_OFFSET;
+ port->port.type = PORT_XR17D15X;
+
+ // XR17V25X supports fractional baudrates
+ port->port.get_divisor = xr17v35x_get_divisor;
+ port->port.set_divisor = xr17v35x_set_divisor;
+ port->port.startup = xr17v35x_startup;
+
+ if (CTI_PORT_TYPE_RS485(port_type)) {
+ switch (pcidev->subsystem_device) {
+ // These cards support power on 485 tri-state via MPIO
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485:
+ port->port.rs485_config = cti_rs485_config_mpio_tristate;
break;
- case PCI_DEVICE_ID_COMMTECH_2324PCI335:
- case PCI_DEVICE_ID_COMMTECH_2328PCI335:
- writeb(0x00, p + UART_EXAR_MPIOLVL_7_0);
- writeb(0xc0, p + UART_EXAR_MPIOINV_7_0);
- writeb(0xc0, p + UART_EXAR_MPIOSEL_7_0);
+ // Otherwise auto or no power on 485 tri-state support
+ default:
+ port->port.rs485_config = generic_rs485_config;
break;
}
- writeb(0x00, p + UART_EXAR_MPIOINT_7_0);
- writeb(0x00, p + UART_EXAR_MPIO3T_7_0);
- writeb(0x00, p + UART_EXAR_MPIOOD_7_0);
+
+ port->port.rs485_supported = generic_rs485_supported;
}
+ ret = cti_port_setup_common(priv, pcidev, idx, offset, port);
+ if (ret)
+ return ret;
+
+ exar_write_reg(priv, (offset + UART_EXAR_8XMODE), 0x00);
+ exar_write_reg(priv, (offset + UART_EXAR_FCTR), UART_FCTR_EXAR_TRGD);
+ exar_write_reg(priv, (offset + UART_EXAR_TXTRG), 32);
+ exar_write_reg(priv, (offset + UART_EXAR_RXTRG), 32);
+
return 0;
}
-static int
-pci_connect_tech_setup(struct exar8250 *priv, struct pci_dev *pcidev,
- struct uart_8250_port *port, int idx)
+static void cti_board_init_xr17c15x(struct exar8250 *priv, struct pci_dev *pcidev)
{
- unsigned int offset = idx * 0x200;
- unsigned int baud = 1843200;
+ cti_board_init_osc_freq(priv, pcidev, CTI_EE_OFF_XR17C15X_OSC_FREQ);
+
+ /* enable interrupts on cards that need the "PLX fix" */
+ switch (pcidev->subsystem_device) {
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_B:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_B:
+ cti_plx_int_enable(priv);
+ break;
+ default:
+ break;
+ }
+}
- port->port.uartclk = baud * 16;
- return default_setup(priv, pcidev, idx, offset, port);
+static int cti_port_setup_xr17c15x(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ struct uart_8250_port *port,
+ int idx)
+{
+ enum cti_port_type port_type;
+ unsigned int offset;
+
+ if (idx == 0)
+ cti_board_init_xr17c15x(priv, pcidev);
+
+ port_type = cti_get_port_type_xr17c15x_xr17v25x(priv, pcidev, idx);
+
+ offset = idx * UART_EXAR_XR17C15X_PORT_OFFSET;
+ port->port.type = PORT_XR17D15X;
+
+ if (CTI_PORT_TYPE_RS485(port_type)) {
+ switch (pcidev->subsystem_device) {
+ // These cards support power on 485 tri-state via MPIO
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485:
+ port->port.rs485_config = cti_rs485_config_mpio_tristate;
+ break;
+ // Otherwise auto or no power on 485 tri-state support
+ default:
+ port->port.rs485_config = generic_rs485_config;
+ break;
+ }
+
+ port->port.rs485_supported = generic_rs485_supported;
+ }
+
+ return cti_port_setup_common(priv, pcidev, idx, offset, port);
}
static int
@@ -344,11 +1168,10 @@ static void setup_gpio(struct pci_dev *pcidev, u8 __iomem *p)
* devices will export them as GPIOs, so we pre-configure them safely
* as inputs.
*/
-
u8 dir = 0x00;
if ((pcidev->vendor == PCI_VENDOR_ID_EXAR) &&
- (pcidev->subsystem_vendor != PCI_VENDOR_ID_SEALEVEL)) {
+ (pcidev->subsystem_vendor != PCI_VENDOR_ID_SEALEVEL)) {
// Configure GPIO as inputs for Commtech adapters
dir = 0xff;
} else {
@@ -425,27 +1248,6 @@ static void xr17v35x_unregister_gpio(struct uart_8250_port *port)
port->port.private_data = NULL;
}
-static int generic_rs485_config(struct uart_port *port, struct ktermios *termios,
- struct serial_rs485 *rs485)
-{
- bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED);
- u8 __iomem *p = port->membase;
- u8 value;
-
- value = readb(p + UART_EXAR_FCTR);
- if (is_rs485)
- value |= UART_FCTR_EXAR_485;
- else
- value &= ~UART_FCTR_EXAR_485;
-
- writeb(value, p + UART_EXAR_FCTR);
-
- if (is_rs485)
- writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR);
-
- return 0;
-}
-
static int sealevel_rs485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
@@ -459,35 +1261,32 @@ static int sealevel_rs485_config(struct uart_port *port, struct ktermios *termio
if (ret)
return ret;
- if (rs485->flags & SER_RS485_ENABLED) {
- old_lcr = readb(p + UART_LCR);
+ if (!(rs485->flags & SER_RS485_ENABLED))
+ return 0;
- /* Set EFR[4]=1 to enable enhanced feature registers */
- efr = readb(p + UART_XR_EFR);
- efr |= UART_EFR_ECB;
- writeb(efr, p + UART_XR_EFR);
+ old_lcr = readb(p + UART_LCR);
- /* Set MCR to use DTR as Auto-RS485 Enable signal */
- writeb(UART_MCR_OUT1, p + UART_MCR);
+ /* Set EFR[4]=1 to enable enhanced feature registers */
+ efr = readb(p + UART_XR_EFR);
+ efr |= UART_EFR_ECB;
+ writeb(efr, p + UART_XR_EFR);
- /* Set LCR[7]=1 to enable access to DLD register */
- writeb(old_lcr | UART_LCR_DLAB, p + UART_LCR);
+ /* Set MCR to use DTR as Auto-RS485 Enable signal */
+ writeb(UART_MCR_OUT1, p + UART_MCR);
- /* Set DLD[7]=1 for inverted RS485 Enable logic */
- dld = readb(p + UART_EXAR_DLD);
- dld |= UART_EXAR_DLD_485_POLARITY;
- writeb(dld, p + UART_EXAR_DLD);
+ /* Set LCR[7]=1 to enable access to DLD register */
+ writeb(old_lcr | UART_LCR_DLAB, p + UART_LCR);
- writeb(old_lcr, p + UART_LCR);
- }
+ /* Set DLD[7]=1 for inverted RS485 Enable logic */
+ dld = readb(p + UART_EXAR_DLD);
+ dld |= UART_EXAR_DLD_485_POLARITY;
+ writeb(dld, p + UART_EXAR_DLD);
+
+ writeb(old_lcr, p + UART_LCR);
return 0;
}
-static const struct serial_rs485 generic_rs485_supported = {
- .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND,
-};
-
static const struct exar8250_platform exar8250_default_platform = {
.register_gpio = xr17v35x_register_gpio,
.unregister_gpio = xr17v35x_unregister_gpio,
@@ -672,6 +1471,35 @@ static irqreturn_t exar_misc_handler(int irq, void *data)
return IRQ_HANDLED;
}
+static unsigned int exar_get_nr_ports(struct exar8250_board *board, struct pci_dev *pcidev)
+{
+ if (pcidev->vendor == PCI_VENDOR_ID_ACCESSIO)
+ return BIT(((pcidev->device & 0x38) >> 3) - 1);
+
+ // Check if board struct overrides number of ports
+ if (board->num_ports > 0)
+ return board->num_ports;
+
+ // Exar encodes # ports in last nibble of PCI Device ID ex. 0358
+ if (pcidev->vendor == PCI_VENDOR_ID_EXAR)
+ return pcidev->device & 0x0f;
+
+ // Handle CTI FPGA cards
+ if (pcidev->vendor == PCI_VENDOR_ID_CONNECT_TECH) {
+ switch (pcidev->device) {
+ case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG00X:
+ case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG01X:
+ return 12;
+ case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_16:
+ return 16;
+ default:
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
static int
exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
{
@@ -691,12 +1519,9 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
maxnr = pci_resource_len(pcidev, bar) >> (board->reg_shift + 3);
- if (pcidev->vendor == PCI_VENDOR_ID_ACCESSIO)
- nr_ports = BIT(((pcidev->device & 0x38) >> 3) - 1);
- else if (board->num_ports)
- nr_ports = board->num_ports;
- else
- nr_ports = pcidev->device & 0x0f;
+ nr_ports = exar_get_nr_ports(board, pcidev);
+ if (nr_ports == 0)
+ return dev_err_probe(&pcidev->dev, -ENODEV, "failed to get number of ports\n");
priv = devm_kzalloc(&pcidev->dev, struct_size(priv, line, nr_ports), GFP_KERNEL);
if (!priv)
@@ -729,7 +1554,7 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
for (i = 0; i < nr_ports && i < maxnr; i++) {
rc = board->setup(priv, pcidev, &uart, i);
if (rc) {
- dev_err(&pcidev->dev, "Failed to setup port %u\n", i);
+ dev_err_probe(&pcidev->dev, rc, "Failed to setup port %u\n", i);
break;
}
@@ -738,10 +1563,9 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
priv->line[i] = serial8250_register_8250_port(&uart);
if (priv->line[i] < 0) {
- dev_err(&pcidev->dev,
- "Couldn't register serial port %lx, irq %d, type %d, error %d\n",
- uart.port.iobase, uart.port.irq,
- uart.port.iotype, priv->line[i]);
+ dev_err_probe(&pcidev->dev, priv->line[i],
+ "Couldn't register serial port %lx, type %d, irq %d\n",
+ uart.port.iobase, uart.port.iotype, uart.port.irq);
break;
}
}
@@ -806,8 +1630,20 @@ static const struct exar8250_board pbn_fastcom335_8 = {
.setup = pci_fastcom335_setup,
};
-static const struct exar8250_board pbn_connect = {
- .setup = pci_connect_tech_setup,
+static const struct exar8250_board pbn_cti_xr17c15x = {
+ .setup = cti_port_setup_xr17c15x,
+};
+
+static const struct exar8250_board pbn_cti_xr17v25x = {
+ .setup = cti_port_setup_xr17v25x,
+};
+
+static const struct exar8250_board pbn_cti_xr17v35x = {
+ .setup = cti_port_setup_xr17v35x,
+};
+
+static const struct exar8250_board pbn_cti_fpga = {
+ .setup = cti_port_setup_fpga,
};
static const struct exar8250_board pbn_exar_ibm_saturn = {
@@ -854,13 +1690,13 @@ static const struct exar8250_board pbn_exar_XR17V8358 = {
.exit = pci_xr17v35x_exit,
};
-#define CONNECT_DEVICE(devid, sdevid, bd) { \
- PCI_DEVICE_SUB( \
- PCI_VENDOR_ID_EXAR, \
- PCI_DEVICE_ID_EXAR_##devid, \
- PCI_SUBVENDOR_ID_CONNECT_TECH, \
- PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_##sdevid), 0, 0, \
- (kernel_ulong_t)&bd \
+#define CTI_EXAR_DEVICE(devid, bd) { \
+ PCI_DEVICE_SUB( \
+ PCI_VENDOR_ID_EXAR, \
+ PCI_DEVICE_ID_EXAR_##devid, \
+ PCI_SUBVENDOR_ID_CONNECT_TECH, \
+ PCI_ANY_ID), 0, 0, \
+ (kernel_ulong_t)&bd \
}
#define EXAR_DEVICE(vend, devid, bd) { PCI_DEVICE_DATA(vend, devid, &bd) }
@@ -869,7 +1705,7 @@ static const struct exar8250_board pbn_exar_XR17V8358 = {
PCI_DEVICE_SUB( \
PCI_VENDOR_ID_EXAR, \
PCI_DEVICE_ID_EXAR_##devid, \
- PCI_VENDOR_ID_IBM, \
+ PCI_SUBVENDOR_ID_IBM, \
PCI_SUBDEVICE_ID_IBM_##sdevid), 0, 0, \
(kernel_ulong_t)&bd \
}
@@ -892,18 +1728,23 @@ static const struct pci_device_id exar_pci_tbl[] = {
EXAR_DEVICE(ACCESSIO, COM_4SM, pbn_exar_XR17C15x),
EXAR_DEVICE(ACCESSIO, COM_8SM, pbn_exar_XR17C15x),
- CONNECT_DEVICE(XR17C152, UART_2_232, pbn_connect),
- CONNECT_DEVICE(XR17C154, UART_4_232, pbn_connect),
- CONNECT_DEVICE(XR17C158, UART_8_232, pbn_connect),
- CONNECT_DEVICE(XR17C152, UART_1_1, pbn_connect),
- CONNECT_DEVICE(XR17C154, UART_2_2, pbn_connect),
- CONNECT_DEVICE(XR17C158, UART_4_4, pbn_connect),
- CONNECT_DEVICE(XR17C152, UART_2, pbn_connect),
- CONNECT_DEVICE(XR17C154, UART_4, pbn_connect),
- CONNECT_DEVICE(XR17C158, UART_8, pbn_connect),
- CONNECT_DEVICE(XR17C152, UART_2_485, pbn_connect),
- CONNECT_DEVICE(XR17C154, UART_4_485, pbn_connect),
- CONNECT_DEVICE(XR17C158, UART_8_485, pbn_connect),
+ /* Connect Tech cards with Exar vendor/device PCI IDs */
+ CTI_EXAR_DEVICE(XR17C152, pbn_cti_xr17c15x),
+ CTI_EXAR_DEVICE(XR17C154, pbn_cti_xr17c15x),
+ CTI_EXAR_DEVICE(XR17C158, pbn_cti_xr17c15x),
+
+ CTI_EXAR_DEVICE(XR17V252, pbn_cti_xr17v25x),
+ CTI_EXAR_DEVICE(XR17V254, pbn_cti_xr17v25x),
+ CTI_EXAR_DEVICE(XR17V258, pbn_cti_xr17v25x),
+
+ CTI_EXAR_DEVICE(XR17V352, pbn_cti_xr17v35x),
+ CTI_EXAR_DEVICE(XR17V354, pbn_cti_xr17v35x),
+ CTI_EXAR_DEVICE(XR17V358, pbn_cti_xr17v35x),
+
+ /* Connect Tech cards with Connect Tech vendor/device PCI IDs (FPGA based) */
+ EXAR_DEVICE(CONNECT_TECH, PCI_XR79X_12_XIG00X, pbn_cti_fpga),
+ EXAR_DEVICE(CONNECT_TECH, PCI_XR79X_12_XIG01X, pbn_cti_fpga),
+ EXAR_DEVICE(CONNECT_TECH, PCI_XR79X_16, pbn_cti_fpga),
IBM_DEVICE(XR17C152, SATURN_SERIAL_ONE_PORT, pbn_exar_ibm_saturn),
diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index 9ff6bbe9c086..c365a349421a 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -199,7 +199,7 @@ static int mtk8250_startup(struct uart_port *port)
if (up->dma) {
data->rx_status = DMA_RX_START;
- uart_circ_clear(&port->state->xmit);
+ kfifo_reset(&port->state->port.xmit_fifo);
}
#endif
memset(&port->icount, 0, sizeof(port->icount));
diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 5d1dd992d8fb..e14f47ef1172 100644
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -18,6 +18,7 @@
#include <linux/pm_runtime.h>
#include <linux/clk.h>
#include <linux/reset.h>
+#include <linux/notifier.h>
#include "8250.h"
@@ -26,6 +27,7 @@ struct of_serial_info {
struct reset_control *rst;
int type;
int line;
+ struct notifier_block clk_notifier;
};
/* Nuvoton NPCM timeout register */
@@ -58,6 +60,26 @@ static int npcm_setup(struct uart_port *port)
return 0;
}
+static inline struct of_serial_info *clk_nb_to_info(struct notifier_block *nb)
+{
+ return container_of(nb, struct of_serial_info, clk_notifier);
+}
+
+static int of_platform_serial_clk_notifier_cb(struct notifier_block *nb, unsigned long event,
+ void *data)
+{
+ struct of_serial_info *info = clk_nb_to_info(nb);
+ struct uart_8250_port *port8250 = serial8250_get_port(info->line);
+ struct clk_notifier_data *ndata = data;
+
+ if (event == POST_RATE_CHANGE) {
+ serial8250_update_uartclk(&port8250->port, ndata->new_rate);
+ return NOTIFY_OK;
+ }
+
+ return NOTIFY_DONE;
+}
+
/*
* Fill a struct uart_port for a given device node
*/
@@ -218,7 +240,19 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
info->type = port_type;
info->line = ret;
platform_set_drvdata(ofdev, info);
+
+ if (info->clk) {
+ info->clk_notifier.notifier_call = of_platform_serial_clk_notifier_cb;
+ ret = clk_notifier_register(info->clk, &info->clk_notifier);
+ if (ret) {
+ dev_err_probe(port8250.port.dev, ret, "Failed to set the clock notifier\n");
+ goto err_unregister;
+ }
+ }
+
return 0;
+err_unregister:
+ serial8250_unregister_port(info->line);
err_dispose:
pm_runtime_put_sync(&ofdev->dev);
pm_runtime_disable(&ofdev->dev);
@@ -234,6 +268,9 @@ static void of_platform_serial_remove(struct platform_device *ofdev)
{
struct of_serial_info *info = platform_get_drvdata(ofdev);
+ if (info->clk)
+ clk_notifier_unregister(info->clk, &info->clk_notifier);
+
serial8250_unregister_port(info->line);
reset_control_assert(info->rst);
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 66901d93089a..170639d12b2a 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -19,7 +19,6 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
-#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/delay.h>
#include <linux/pm_runtime.h>
@@ -1094,7 +1093,7 @@ static void omap_8250_dma_tx_complete(void *param)
{
struct uart_8250_port *p = param;
struct uart_8250_dma *dma = p->dma;
- struct circ_buf *xmit = &p->port.state->xmit;
+ struct tty_port *tport = &p->port.state->port;
unsigned long flags;
bool en_thri = false;
struct omap8250_priv *priv = p->port.private_data;
@@ -1113,10 +1112,10 @@ static void omap_8250_dma_tx_complete(void *param)
omap8250_restore_regs(p);
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&p->port);
- if (!uart_circ_empty(xmit) && !uart_tx_stopped(&p->port)) {
+ if (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(&p->port)) {
int ret;
ret = omap_8250_tx_dma(p);
@@ -1138,14 +1137,15 @@ static int omap_8250_tx_dma(struct uart_8250_port *p)
{
struct uart_8250_dma *dma = p->dma;
struct omap8250_priv *priv = p->port.private_data;
- struct circ_buf *xmit = &p->port.state->xmit;
+ struct tty_port *tport = &p->port.state->port;
struct dma_async_tx_descriptor *desc;
- unsigned int skip_byte = 0;
+ struct scatterlist sg;
+ int skip_byte = -1;
int ret;
if (dma->tx_running)
return 0;
- if (uart_tx_stopped(&p->port) || uart_circ_empty(xmit)) {
+ if (uart_tx_stopped(&p->port) || kfifo_is_empty(&tport->xmit_fifo)) {
/*
* Even if no data, we need to return an error for the two cases
@@ -1160,8 +1160,18 @@ static int omap_8250_tx_dma(struct uart_8250_port *p)
return 0;
}
- dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ sg_init_table(&sg, 1);
+ ret = kfifo_dma_out_prepare_mapped(&tport->xmit_fifo, &sg, 1,
+ UART_XMIT_SIZE, dma->tx_addr);
+ if (ret != 1) {
+ serial8250_clear_THRI(p);
+ return 0;
+ }
+
+ dma->tx_size = sg_dma_len(&sg);
+
if (priv->habit & OMAP_DMA_TX_KICK) {
+ unsigned char c;
u8 tx_lvl;
/*
@@ -1188,12 +1198,17 @@ static int omap_8250_tx_dma(struct uart_8250_port *p)
ret = -EINVAL;
goto err;
}
- skip_byte = 1;
+ if (!kfifo_get(&tport->xmit_fifo, &c)) {
+ ret = -EINVAL;
+ goto err;
+ }
+ skip_byte = c;
+ /* now we need to recompute due to kfifo_get */
+ kfifo_dma_out_prepare_mapped(&tport->xmit_fifo, &sg, 1,
+ UART_XMIT_SIZE, dma->tx_addr);
}
- desc = dmaengine_prep_slave_single(dma->txchan,
- dma->tx_addr + xmit->tail + skip_byte,
- dma->tx_size - skip_byte, DMA_MEM_TO_DEV,
+ desc = dmaengine_prep_slave_sg(dma->txchan, &sg, 1, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
ret = -EBUSY;
@@ -1215,11 +1230,13 @@ static int omap_8250_tx_dma(struct uart_8250_port *p)
dma->tx_err = 0;
serial8250_clear_THRI(p);
- if (skip_byte)
- serial_out(p, UART_TX, xmit->buf[xmit->tail]);
- return 0;
+ ret = 0;
+ goto out_skip;
err:
dma->tx_err = 1;
+out_skip:
+ if (skip_byte >= 0)
+ serial_out(p, UART_TX, skip_byte);
return ret;
}
@@ -1308,7 +1325,7 @@ static int omap_8250_dma_handle_irq(struct uart_port *port)
serial8250_modem_status(up);
if (status & UART_LSR_THRE && up->dma->tx_err) {
if (uart_tx_stopped(&up->port) ||
- uart_circ_empty(&up->port.state->xmit)) {
+ kfifo_is_empty(&up->port.state->port.xmit_fifo)) {
up->dma->tx_err = 0;
serial8250_tx_chars(up);
} else {
diff --git a/drivers/tty/serial/8250/8250_pci1xxxx.c b/drivers/tty/serial/8250/8250_pci1xxxx.c
index 2fbb5851f788..d3930bf32fe4 100644
--- a/drivers/tty/serial/8250/8250_pci1xxxx.c
+++ b/drivers/tty/serial/8250/8250_pci1xxxx.c
@@ -382,10 +382,10 @@ static void pci1xxxx_rx_burst(struct uart_port *port, u32 uart_status)
}
static void pci1xxxx_process_write_data(struct uart_port *port,
- struct circ_buf *xmit,
int *data_empty_count,
u32 *valid_byte_count)
{
+ struct tty_port *tport = &port->state->port;
u32 valid_burst_count = *valid_byte_count / UART_BURST_SIZE;
/*
@@ -395,41 +395,36 @@ static void pci1xxxx_process_write_data(struct uart_port *port,
* one byte at a time.
*/
while (valid_burst_count) {
+ u32 c;
+
if (*data_empty_count - UART_BURST_SIZE < 0)
break;
- if (xmit->tail > (UART_XMIT_SIZE - UART_BURST_SIZE))
+ if (kfifo_len(&tport->xmit_fifo) < UART_BURST_SIZE)
+ break;
+ if (WARN_ON(kfifo_out(&tport->xmit_fifo, (u8 *)&c, sizeof(c)) !=
+ sizeof(c)))
break;
- writel(*(unsigned int *)&xmit->buf[xmit->tail],
- port->membase + UART_TX_BURST_FIFO);
+ writel(c, port->membase + UART_TX_BURST_FIFO);
*valid_byte_count -= UART_BURST_SIZE;
*data_empty_count -= UART_BURST_SIZE;
valid_burst_count -= UART_BYTE_SIZE;
-
- xmit->tail = (xmit->tail + UART_BURST_SIZE) &
- (UART_XMIT_SIZE - 1);
}
while (*valid_byte_count) {
- if (*data_empty_count - UART_BYTE_SIZE < 0)
+ u8 c;
+
+ if (!kfifo_get(&tport->xmit_fifo, &c))
break;
- writeb(xmit->buf[xmit->tail], port->membase +
- UART_TX_BYTE_FIFO);
+ writeb(c, port->membase + UART_TX_BYTE_FIFO);
*data_empty_count -= UART_BYTE_SIZE;
*valid_byte_count -= UART_BYTE_SIZE;
/*
- * When the tail of the circular buffer is reached, the next
- * byte is transferred to the beginning of the buffer.
- */
- xmit->tail = (xmit->tail + UART_BYTE_SIZE) &
- (UART_XMIT_SIZE - 1);
-
- /*
* If there are any pending burst count, data is handled by
* transmitting DWORDs at a time.
*/
- if (valid_burst_count && (xmit->tail <
- (UART_XMIT_SIZE - UART_BURST_SIZE)))
+ if (valid_burst_count &&
+ kfifo_len(&tport->xmit_fifo) >= UART_BURST_SIZE)
break;
}
}
@@ -437,11 +432,9 @@ static void pci1xxxx_process_write_data(struct uart_port *port,
static void pci1xxxx_tx_burst(struct uart_port *port, u32 uart_status)
{
struct uart_8250_port *up = up_to_u8250p(port);
+ struct tty_port *tport = &port->state->port;
u32 valid_byte_count;
int data_empty_count;
- struct circ_buf *xmit;
-
- xmit = &port->state->xmit;
if (port->x_char) {
writeb(port->x_char, port->membase + UART_TX);
@@ -450,25 +443,25 @@ static void pci1xxxx_tx_burst(struct uart_port *port, u32 uart_status)
return;
}
- if ((uart_tx_stopped(port)) || (uart_circ_empty(xmit))) {
+ if ((uart_tx_stopped(port)) || kfifo_is_empty(&tport->xmit_fifo)) {
port->ops->stop_tx(port);
} else {
data_empty_count = (pci1xxxx_read_burst_status(port) &
UART_BST_STAT_TX_COUNT_MASK) >> 8;
do {
- valid_byte_count = uart_circ_chars_pending(xmit);
+ valid_byte_count = kfifo_len(&tport->xmit_fifo);
- pci1xxxx_process_write_data(port, xmit,
+ pci1xxxx_process_write_data(port,
&data_empty_count,
&valid_byte_count);
port->icount.tx++;
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
break;
} while (data_empty_count && valid_byte_count);
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
/*
@@ -476,7 +469,8 @@ static void pci1xxxx_tx_burst(struct uart_port *port, u32 uart_status)
* the HW can go idle. So we get here once again with empty FIFO and
* disable the interrupt and RPM in __stop_tx()
*/
- if (uart_circ_empty(xmit) && !(up->capabilities & UART_CAP_RPM))
+ if (kfifo_is_empty(&tport->xmit_fifo) &&
+ !(up->capabilities & UART_CAP_RPM))
port->ops->stop_tx(port);
}
diff --git a/drivers/tty/serial/8250/8250_pnp.c b/drivers/tty/serial/8250/8250_pnp.c
index 1974bbadc975..7c06ae79d8e2 100644
--- a/drivers/tty/serial/8250/8250_pnp.c
+++ b/drivers/tty/serial/8250/8250_pnp.c
@@ -10,6 +10,7 @@
*/
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/pm.h>
#include <linux/pnp.h>
#include <linux/string.h>
#include <linux/kernel.h>
@@ -434,7 +435,9 @@ static int
serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
{
struct uart_8250_port uart, *port;
- int ret, line, flags = dev_id->driver_data;
+ int ret, flags = dev_id->driver_data;
+ unsigned char iotype;
+ long line;
if (flags & UNKNOWN_DEV) {
ret = serial_pnp_guess_board(dev);
@@ -443,37 +446,46 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
}
memset(&uart, 0, sizeof(uart));
- if (pnp_irq_valid(dev, 0))
- uart.port.irq = pnp_irq(dev, 0);
if ((flags & CIR_PORT) && pnp_port_valid(dev, 2)) {
uart.port.iobase = pnp_port_start(dev, 2);
- uart.port.iotype = UPIO_PORT;
+ iotype = UPIO_PORT;
} else if (pnp_port_valid(dev, 0)) {
uart.port.iobase = pnp_port_start(dev, 0);
- uart.port.iotype = UPIO_PORT;
+ iotype = UPIO_PORT;
} else if (pnp_mem_valid(dev, 0)) {
uart.port.mapbase = pnp_mem_start(dev, 0);
- uart.port.iotype = UPIO_MEM;
+ uart.port.mapsize = pnp_mem_len(dev, 0);
+ iotype = UPIO_MEM;
uart.port.flags = UPF_IOREMAP;
} else
return -ENODEV;
- dev_dbg(&dev->dev,
- "Setup PNP port: port %#lx, mem %#llx, irq %u, type %u\n",
- uart.port.iobase, (unsigned long long)uart.port.mapbase,
- uart.port.irq, uart.port.iotype);
+ uart.port.uartclk = 1843200;
+ uart.port.dev = &dev->dev;
+ uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
+
+ ret = uart_read_port_properties(&uart.port);
+ /* no interrupt -> fall back to polling */
+ if (ret == -ENXIO)
+ ret = 0;
+ if (ret)
+ return ret;
+
+ /*
+ * The previous call may not set iotype correctly when reg-io-width
+ * property is absent and it doesn't support IO port resource.
+ */
+ uart.port.iotype = iotype;
if (flags & CIR_PORT) {
uart.port.flags |= UPF_FIXED_PORT | UPF_FIXED_TYPE;
uart.port.type = PORT_8250_CIR;
}
- uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
- if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
- uart.port.flags |= UPF_SHARE_IRQ;
- uart.port.uartclk = 1843200;
- device_property_read_u32(&dev->dev, "clock-frequency", &uart.port.uartclk);
- uart.port.dev = &dev->dev;
+ dev_dbg(&dev->dev,
+ "Setup PNP port: port %#lx, mem %#llx, size %#llx, irq %u, type %u\n",
+ uart.port.iobase, (unsigned long long)uart.port.mapbase,
+ (unsigned long long)uart.port.mapsize, uart.port.irq, uart.port.iotype);
line = serial8250_register_8250_port(&uart);
if (line < 0 || (flags & CIR_PORT))
@@ -483,7 +495,7 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
if (uart_console(&port->port))
dev->capabilities |= PNP_CONSOLE;
- pnp_set_drvdata(dev, (void *)((long)line + 1));
+ pnp_set_drvdata(dev, (void *)line);
return 0;
}
@@ -492,38 +504,33 @@ static void serial_pnp_remove(struct pnp_dev *dev)
long line = (long)pnp_get_drvdata(dev);
dev->capabilities &= ~PNP_CONSOLE;
- if (line)
- serial8250_unregister_port(line - 1);
+ serial8250_unregister_port(line);
}
-static int __maybe_unused serial_pnp_suspend(struct device *dev)
+static int serial_pnp_suspend(struct device *dev)
{
long line = (long)dev_get_drvdata(dev);
- if (!line)
- return -ENODEV;
- serial8250_suspend_port(line - 1);
+ serial8250_suspend_port(line);
return 0;
}
-static int __maybe_unused serial_pnp_resume(struct device *dev)
+static int serial_pnp_resume(struct device *dev)
{
long line = (long)dev_get_drvdata(dev);
- if (!line)
- return -ENODEV;
- serial8250_resume_port(line - 1);
+ serial8250_resume_port(line);
return 0;
}
-static SIMPLE_DEV_PM_OPS(serial_pnp_pm_ops, serial_pnp_suspend, serial_pnp_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(serial_pnp_pm_ops, serial_pnp_suspend, serial_pnp_resume);
static struct pnp_driver serial_pnp_driver = {
.name = "serial",
.probe = serial_pnp_probe,
.remove = serial_pnp_remove,
.driver = {
- .pm = &serial_pnp_pm_ops,
+ .pm = pm_sleep_ptr(&serial_pnp_pm_ops),
},
.id_table = pnp_dev_table,
};
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index fc9dd5d45295..893bc493f662 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -612,13 +612,6 @@ int serial8250_em485_config(struct uart_port *port, struct ktermios *termios,
{
struct uart_8250_port *up = up_to_u8250p(port);
- /* pick sane settings if the user hasn't */
- if (!!(rs485->flags & SER_RS485_RTS_ON_SEND) ==
- !!(rs485->flags & SER_RS485_RTS_AFTER_SEND)) {
- rs485->flags |= SER_RS485_RTS_ON_SEND;
- rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
- }
-
/*
* Both serial8250_em485_init() and serial8250_em485_destroy()
* are idempotent.
@@ -1630,7 +1623,7 @@ static void serial8250_start_tx(struct uart_port *port)
/* Port locked to synchronize UART_IER access against the console. */
lockdep_assert_held_once(&port->lock);
- if (!port->x_char && uart_circ_empty(&port->state->xmit))
+ if (!port->x_char && kfifo_is_empty(&port->state->port.xmit_fifo))
return;
serial8250_rpm_get_tx(up);
@@ -1778,7 +1771,7 @@ EXPORT_SYMBOL_GPL(serial8250_rx_chars);
void serial8250_tx_chars(struct uart_8250_port *up)
{
struct uart_port *port = &up->port;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
int count;
if (port->x_char) {
@@ -1789,14 +1782,19 @@ void serial8250_tx_chars(struct uart_8250_port *up)
serial8250_stop_tx(port);
return;
}
- if (uart_circ_empty(xmit)) {
+ if (kfifo_is_empty(&tport->xmit_fifo)) {
__stop_tx(up);
return;
}
count = up->tx_loadsz;
do {
- serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+ unsigned char c;
+
+ if (!uart_fifo_get(port, &c))
+ break;
+
+ serial_out(up, UART_TX, c);
if (up->bugs & UART_BUG_TXRACE) {
/*
* The Aspeed BMC virtual UARTs have a bug where data
@@ -1809,9 +1807,7 @@ void serial8250_tx_chars(struct uart_8250_port *up)
*/
serial_in(up, UART_SCR);
}
- uart_xmit_advance(port, 1);
- if (uart_circ_empty(xmit))
- break;
+
if ((up->capabilities & UART_CAP_HFIFO) &&
!uart_lsr_tx_empty(serial_in(up, UART_LSR)))
break;
@@ -1821,7 +1817,7 @@ void serial8250_tx_chars(struct uart_8250_port *up)
break;
} while (--count > 0);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
/*
@@ -1829,7 +1825,8 @@ void serial8250_tx_chars(struct uart_8250_port *up)
* HW can go idle. So we get here once again with empty FIFO and disable
* the interrupt and RPM in __stop_tx()
*/
- if (uart_circ_empty(xmit) && !(up->capabilities & UART_CAP_RPM))
+ if (kfifo_is_empty(&tport->xmit_fifo) &&
+ !(up->capabilities & UART_CAP_RPM))
__stop_tx(up);
}
EXPORT_SYMBOL_GPL(serial8250_tx_chars);
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index ffcf4882b25f..4fdd7857ef4d 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -307,11 +307,14 @@ config SERIAL_TEGRA_TCU_CONSOLE
If unsure, say Y.
config SERIAL_MAX3100
- tristate "MAX3100 support"
+ tristate "MAX3100/3110/3111/3222 support"
depends on SPI
select SERIAL_CORE
help
- MAX3100 chip support
+ This selects support for an advanced UART from Maxim.
+ Supported ICs are MAX3100, MAX3110, MAX3111, MAX3222.
+
+ Say Y here if you want to support these ICs.
config SERIAL_MAX310X
tristate "MAX310X support"
@@ -1021,41 +1024,30 @@ config SERIAL_SCCNXP_CONSOLE
Support for console on SCCNXP serial ports.
config SERIAL_SC16IS7XX_CORE
- tristate
-
-config SERIAL_SC16IS7XX
- tristate "SC16IS7xx serial support"
+ tristate "NXP SC16IS7xx UART support"
select SERIAL_CORE
- depends on (SPI_MASTER && !I2C) || I2C
+ select SERIAL_SC16IS7XX_SPI if SPI_MASTER
+ select SERIAL_SC16IS7XX_I2C if I2C
help
- This selects support for SC16IS7xx serial ports.
- Supported ICs are SC16IS740, SC16IS741, SC16IS750, SC16IS752,
- SC16IS760 and SC16IS762. Select supported buses using options below.
+ Core driver for NXP SC16IS7xx UARTs.
+ Supported ICs are:
+
+ SC16IS740
+ SC16IS741
+ SC16IS750
+ SC16IS752
+ SC16IS760
+ SC16IS762
+
+ The driver supports both I2C and SPI interfaces.
config SERIAL_SC16IS7XX_I2C
- bool "SC16IS7xx for I2C interface"
- depends on SERIAL_SC16IS7XX
- depends on I2C
- select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX
- select REGMAP_I2C if I2C
- default y
- help
- Enable SC16IS7xx driver on I2C bus,
- If required say y, and say n to i2c if not required,
- Enabled by default to support oldconfig.
- You must select at least one bus for the driver to be built.
+ tristate
+ select REGMAP_I2C
config SERIAL_SC16IS7XX_SPI
- bool "SC16IS7xx for spi interface"
- depends on SERIAL_SC16IS7XX
- depends on SPI_MASTER
- select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX
- select REGMAP_SPI if SPI_MASTER
- help
- Enable SC16IS7xx driver on SPI bus,
- If required say y, and say n to spi if not required,
- This is additional support to existing driver.
- You must select at least one bus for the driver to be built.
+ tristate
+ select REGMAP_SPI
config SERIAL_TIMBERDALE
tristate "Support for timberdale UART"
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index b25e9b54a660..faa45f2b8bb0 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -76,6 +76,8 @@ obj-$(CONFIG_SERIAL_SAMSUNG) += samsung_tty.o
obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o
obj-$(CONFIG_SERIAL_SCCNXP) += sccnxp.o
obj-$(CONFIG_SERIAL_SC16IS7XX_CORE) += sc16is7xx.o
+obj-$(CONFIG_SERIAL_SC16IS7XX_SPI) += sc16is7xx_spi.o
+obj-$(CONFIG_SERIAL_SC16IS7XX_I2C) += sc16is7xx_i2c.o
obj-$(CONFIG_SERIAL_SH_SCI) += sh-sci.o
obj-$(CONFIG_SERIAL_SIFIVE) += sifive.o
obj-$(CONFIG_SERIAL_SPRD) += sprd_serial.o
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 2fa3fb30dc6c..8b1644f5411e 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -256,7 +256,6 @@ struct uart_amba_port {
const u16 *reg_offset;
struct clk *clk;
const struct vendor_data *vendor;
- unsigned int dmacr; /* dma control reg */
unsigned int im; /* interrupt mask */
unsigned int old_status;
unsigned int fifosize; /* vendor-specific */
@@ -266,6 +265,7 @@ struct uart_amba_port {
unsigned int rs485_tx_drain_interval; /* usecs */
#ifdef CONFIG_DMA_ENGINE
/* DMA stuff */
+ unsigned int dmacr; /* dma control reg */
bool using_tx_dma;
bool using_rx_dma;
struct pl011_dmarx_data dmarx;
@@ -535,6 +535,7 @@ static void pl011_start_tx_pio(struct uart_amba_port *uap);
static void pl011_dma_tx_callback(void *data)
{
struct uart_amba_port *uap = data;
+ struct tty_port *tport = &uap->port.state->port;
struct pl011_dmatx_data *dmatx = &uap->dmatx;
unsigned long flags;
u16 dmacr;
@@ -558,7 +559,7 @@ static void pl011_dma_tx_callback(void *data)
* get further refills (hence we check dmacr).
*/
if (!(dmacr & UART011_TXDMAE) || uart_tx_stopped(&uap->port) ||
- uart_circ_empty(&uap->port.state->xmit)) {
+ kfifo_is_empty(&tport->xmit_fifo)) {
uap->dmatx.queued = false;
uart_port_unlock_irqrestore(&uap->port, flags);
return;
@@ -588,7 +589,7 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap)
struct dma_chan *chan = dmatx->chan;
struct dma_device *dma_dev = chan->device;
struct dma_async_tx_descriptor *desc;
- struct circ_buf *xmit = &uap->port.state->xmit;
+ struct tty_port *tport = &uap->port.state->port;
unsigned int count;
/*
@@ -597,7 +598,7 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap)
* the standard interrupt handling. This ensures that we
* issue a uart_write_wakeup() at the appropriate time.
*/
- count = uart_circ_chars_pending(xmit);
+ count = kfifo_len(&tport->xmit_fifo);
if (count < (uap->fifosize >> 1)) {
uap->dmatx.queued = false;
return 0;
@@ -613,21 +614,7 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap)
if (count > PL011_DMA_BUFFER_SIZE)
count = PL011_DMA_BUFFER_SIZE;
- if (xmit->tail < xmit->head) {
- memcpy(&dmatx->buf[0], &xmit->buf[xmit->tail], count);
- } else {
- size_t first = UART_XMIT_SIZE - xmit->tail;
- size_t second;
-
- if (first > count)
- first = count;
- second = count - first;
-
- memcpy(&dmatx->buf[0], &xmit->buf[xmit->tail], first);
- if (second)
- memcpy(&dmatx->buf[first], &xmit->buf[0], second);
- }
-
+ count = kfifo_out_peek(&tport->xmit_fifo, dmatx->buf, count);
dmatx->len = count;
dmatx->dma = dma_map_single(dma_dev->dev, dmatx->buf, count,
DMA_TO_DEVICE);
@@ -670,7 +657,7 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap)
*/
uart_xmit_advance(&uap->port, count);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&uap->port);
return 1;
@@ -1454,7 +1441,7 @@ static bool pl011_tx_char(struct uart_amba_port *uap, unsigned char c,
/* Returns true if tx interrupts have to be (kept) enabled */
static bool pl011_tx_chars(struct uart_amba_port *uap, bool from_irq)
{
- struct circ_buf *xmit = &uap->port.state->xmit;
+ struct tty_port *tport = &uap->port.state->port;
int count = uap->fifosize >> 1;
if (uap->port.x_char) {
@@ -1463,7 +1450,7 @@ static bool pl011_tx_chars(struct uart_amba_port *uap, bool from_irq)
uap->port.x_char = 0;
--count;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(&uap->port)) {
pl011_stop_tx(&uap->port);
return false;
}
@@ -1472,20 +1459,25 @@ static bool pl011_tx_chars(struct uart_amba_port *uap, bool from_irq)
if (pl011_dma_tx_irq(uap))
return true;
- do {
+ while (1) {
+ unsigned char c;
+
if (likely(from_irq) && count-- == 0)
break;
- if (!pl011_tx_char(uap, xmit->buf[xmit->tail], from_irq))
+ if (!kfifo_peek(&tport->xmit_fifo, &c))
break;
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- } while (!uart_circ_empty(xmit));
+ if (!pl011_tx_char(uap, c, from_irq))
+ break;
+
+ kfifo_skip(&tport->xmit_fifo);
+ }
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&uap->port);
- if (uart_circ_empty(xmit)) {
+ if (kfifo_is_empty(&tport->xmit_fifo)) {
pl011_stop_tx(&uap->port);
return false;
}
@@ -2700,18 +2692,6 @@ static int pl011_find_free_port(void)
return -EBUSY;
}
-static int pl011_get_rs485_mode(struct uart_amba_port *uap)
-{
- struct uart_port *port = &uap->port;
- int ret;
-
- ret = uart_get_rs485_mode(port);
- if (ret)
- return ret;
-
- return 0;
-}
-
static int pl011_setup_port(struct device *dev, struct uart_amba_port *uap,
struct resource *mmiobase, int index)
{
@@ -2732,7 +2712,7 @@ static int pl011_setup_port(struct device *dev, struct uart_amba_port *uap,
uap->port.flags = UPF_BOOT_AUTOCONF;
uap->port.line = index;
- ret = pl011_get_rs485_mode(uap);
+ ret = uart_get_rs485_mode(&uap->port);
if (ret)
return ret;
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 7790cbc57391..47889a557119 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -390,7 +390,7 @@ static void ar933x_uart_rx_chars(struct ar933x_uart_port *up)
static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
{
- struct circ_buf *xmit = &up->port.state->xmit;
+ struct tty_port *tport = &up->port.state->port;
struct serial_rs485 *rs485conf = &up->port.rs485;
int count;
bool half_duplex_send = false;
@@ -399,7 +399,7 @@ static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
return;
if ((rs485conf->flags & SER_RS485_ENABLED) &&
- (up->port.x_char || !uart_circ_empty(xmit))) {
+ (up->port.x_char || !kfifo_is_empty(&tport->xmit_fifo))) {
ar933x_uart_stop_rx_interrupt(up);
gpiod_set_value(up->rts_gpiod, !!(rs485conf->flags & SER_RS485_RTS_ON_SEND));
half_duplex_send = true;
@@ -408,6 +408,7 @@ static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
count = up->port.fifosize;
do {
unsigned int rdata;
+ unsigned char c;
rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
if ((rdata & AR933X_UART_DATA_TX_CSR) == 0)
@@ -420,18 +421,16 @@ static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
continue;
}
- if (uart_circ_empty(xmit))
+ if (!uart_fifo_get(&up->port, &c))
break;
- ar933x_uart_putc(up, xmit->buf[xmit->tail]);
-
- uart_xmit_advance(&up->port, 1);
+ ar933x_uart_putc(up, c);
} while (--count > 0);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
- if (!uart_circ_empty(xmit)) {
+ if (!kfifo_is_empty(&tport->xmit_fifo)) {
ar933x_uart_start_tx_interrupt(up);
} else if (half_duplex_send) {
ar933x_uart_wait_tx_complete(up);
@@ -693,7 +692,6 @@ static struct uart_driver ar933x_uart_driver = {
.cons = NULL, /* filled in runtime */
};
-static const struct serial_rs485 ar933x_no_rs485 = {};
static const struct serial_rs485 ar933x_rs485_supported = {
.flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND,
};
@@ -789,7 +787,7 @@ static int ar933x_uart_probe(struct platform_device *pdev)
up->rts_gpiod = mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS);
if (!up->rts_gpiod) {
- port->rs485_supported = ar933x_no_rs485;
+ port->rs485_supported.flags &= ~SER_RS485_ENABLED;
if (port->rs485.flags & SER_RS485_ENABLED) {
dev_err(&pdev->dev, "lacking rts-gpio, disabling RS485\n");
port->rs485.flags &= ~SER_RS485_ENABLED;
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index 1aa5b2b49c26..5c4895d154c0 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -155,7 +155,7 @@ static unsigned int arc_serial_tx_empty(struct uart_port *port)
*/
static void arc_serial_tx_chars(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
int sent = 0;
unsigned char ch;
@@ -164,9 +164,7 @@ static void arc_serial_tx_chars(struct uart_port *port)
port->icount.tx++;
port->x_char = 0;
sent = 1;
- } else if (!uart_circ_empty(xmit)) {
- ch = xmit->buf[xmit->tail];
- uart_xmit_advance(port, 1);
+ } else if (uart_fifo_get(port, &ch)) {
while (!(UART_GET_STATUS(port) & TXEMPTY))
cpu_relax();
UART_SET_DATA(port, ch);
@@ -177,7 +175,7 @@ static void arc_serial_tx_chars(struct uart_port *port)
* If num chars in xmit buffer are too few, ask tty layer for more.
* By Hard ISR to schedule processing in software interrupt part
*/
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (sent)
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 85667f709515..0a90964d6d10 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -96,7 +96,9 @@ struct atmel_uart_char {
* can contain up to 1024 characters in PIO mode and up to 4096 characters in
* DMA mode.
*/
-#define ATMEL_SERIAL_RINGSIZE 1024
+#define ATMEL_SERIAL_RINGSIZE 1024
+#define ATMEL_SERIAL_RX_SIZE array_size(sizeof(struct atmel_uart_char), \
+ ATMEL_SERIAL_RINGSIZE)
/*
* at91: 6 USARTs and one DBGU port (SAM9260)
@@ -132,8 +134,8 @@ struct atmel_uart_port {
struct dma_async_tx_descriptor *desc_rx;
dma_cookie_t cookie_tx;
dma_cookie_t cookie_rx;
- struct scatterlist sg_tx;
- struct scatterlist sg_rx;
+ dma_addr_t tx_phys;
+ dma_addr_t rx_phys;
struct tasklet_struct tasklet_rx;
struct tasklet_struct tasklet_tx;
atomic_t tasklet_shutdown;
@@ -857,7 +859,7 @@ static void atmel_complete_tx_dma(void *arg)
{
struct atmel_uart_port *atmel_port = arg;
struct uart_port *port = &atmel_port->uart;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
struct dma_chan *chan = atmel_port->chan_tx;
unsigned long flags;
@@ -873,15 +875,15 @@ static void atmel_complete_tx_dma(void *arg)
atmel_port->desc_tx = NULL;
spin_unlock(&atmel_port->lock_tx);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
/*
- * xmit is a circular buffer so, if we have just send data from
- * xmit->tail to the end of xmit->buf, now we have to transmit the
- * remaining data from the beginning of xmit->buf to xmit->head.
+ * xmit is a circular buffer so, if we have just send data from the
+ * tail to the end, now we have to transmit the remaining data from the
+ * beginning to the head.
*/
- if (!uart_circ_empty(xmit))
+ if (!kfifo_is_empty(&tport->xmit_fifo))
atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx);
else if (atmel_uart_is_half_duplex(port)) {
/*
@@ -904,8 +906,8 @@ static void atmel_release_tx_dma(struct uart_port *port)
if (chan) {
dmaengine_terminate_all(chan);
dma_release_channel(chan);
- dma_unmap_sg(port->dev, &atmel_port->sg_tx, 1,
- DMA_TO_DEVICE);
+ dma_unmap_single(port->dev, atmel_port->tx_phys,
+ UART_XMIT_SIZE, DMA_TO_DEVICE);
}
atmel_port->desc_tx = NULL;
@@ -919,18 +921,18 @@ static void atmel_release_tx_dma(struct uart_port *port)
static void atmel_tx_dma(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
struct dma_chan *chan = atmel_port->chan_tx;
struct dma_async_tx_descriptor *desc;
- struct scatterlist sgl[2], *sg, *sg_tx = &atmel_port->sg_tx;
- unsigned int tx_len, part1_len, part2_len, sg_len;
+ struct scatterlist sgl[2], *sg;
+ unsigned int tx_len, tail, part1_len, part2_len, sg_len;
dma_addr_t phys_addr;
/* Make sure we have an idle channel */
if (atmel_port->desc_tx != NULL)
return;
- if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) {
+ if (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(port)) {
/*
* DMA is idle now.
* Port xmit buffer is already mapped,
@@ -940,9 +942,8 @@ static void atmel_tx_dma(struct uart_port *port)
* Take the port lock to get a
* consistent xmit buffer state.
*/
- tx_len = CIRC_CNT_TO_END(xmit->head,
- xmit->tail,
- UART_XMIT_SIZE);
+ tx_len = kfifo_out_linear(&tport->xmit_fifo, &tail,
+ UART_XMIT_SIZE);
if (atmel_port->fifo_size) {
/* multi data mode */
@@ -956,7 +957,7 @@ static void atmel_tx_dma(struct uart_port *port)
sg_init_table(sgl, 2);
sg_len = 0;
- phys_addr = sg_dma_address(sg_tx) + xmit->tail;
+ phys_addr = atmel_port->tx_phys + tail;
if (part1_len) {
sg = &sgl[sg_len++];
sg_dma_address(sg) = phys_addr;
@@ -973,7 +974,7 @@ static void atmel_tx_dma(struct uart_port *port)
/*
* save tx_len so atmel_complete_tx_dma() will increase
- * xmit->tail correctly
+ * tail correctly
*/
atmel_port->tx_len = tx_len;
@@ -988,7 +989,8 @@ static void atmel_tx_dma(struct uart_port *port)
return;
}
- dma_sync_sg_for_device(port->dev, sg_tx, 1, DMA_TO_DEVICE);
+ dma_sync_single_for_device(port->dev, atmel_port->tx_phys,
+ UART_XMIT_SIZE, DMA_TO_DEVICE);
atmel_port->desc_tx = desc;
desc->callback = atmel_complete_tx_dma;
@@ -1003,18 +1005,19 @@ static void atmel_tx_dma(struct uart_port *port)
dma_async_issue_pending(chan);
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
static int atmel_prepare_tx_dma(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ struct tty_port *tport = &port->state->port;
struct device *mfd_dev = port->dev->parent;
dma_cap_mask_t mask;
struct dma_slave_config config;
struct dma_chan *chan;
- int ret, nent;
+ int ret;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
@@ -1029,26 +1032,18 @@ static int atmel_prepare_tx_dma(struct uart_port *port)
dma_chan_name(atmel_port->chan_tx));
spin_lock_init(&atmel_port->lock_tx);
- sg_init_table(&atmel_port->sg_tx, 1);
/* UART circular tx buffer is an aligned page. */
- BUG_ON(!PAGE_ALIGNED(port->state->xmit.buf));
- sg_set_page(&atmel_port->sg_tx,
- virt_to_page(port->state->xmit.buf),
- UART_XMIT_SIZE,
- offset_in_page(port->state->xmit.buf));
- nent = dma_map_sg(port->dev,
- &atmel_port->sg_tx,
- 1,
- DMA_TO_DEVICE);
-
- if (!nent) {
+ BUG_ON(!PAGE_ALIGNED(tport->xmit_buf));
+ atmel_port->tx_phys = dma_map_single(port->dev, tport->xmit_buf,
+ UART_XMIT_SIZE, DMA_TO_DEVICE);
+
+ if (dma_mapping_error(port->dev, atmel_port->tx_phys)) {
dev_dbg(port->dev, "need to release resource of dma\n");
goto chan_err;
} else {
- dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", __func__,
- sg_dma_len(&atmel_port->sg_tx),
- port->state->xmit.buf,
- &sg_dma_address(&atmel_port->sg_tx));
+ dev_dbg(port->dev, "%s: mapped %lu@%p to %pad\n", __func__,
+ UART_XMIT_SIZE, tport->xmit_buf,
+ &atmel_port->tx_phys);
}
/* Configure the slave DMA */
@@ -1093,8 +1088,8 @@ static void atmel_release_rx_dma(struct uart_port *port)
if (chan) {
dmaengine_terminate_all(chan);
dma_release_channel(chan);
- dma_unmap_sg(port->dev, &atmel_port->sg_rx, 1,
- DMA_FROM_DEVICE);
+ dma_unmap_single(port->dev, atmel_port->rx_phys,
+ ATMEL_SERIAL_RX_SIZE, DMA_FROM_DEVICE);
}
atmel_port->desc_rx = NULL;
@@ -1127,10 +1122,8 @@ static void atmel_rx_from_dma(struct uart_port *port)
}
/* CPU claims ownership of RX DMA buffer */
- dma_sync_sg_for_cpu(port->dev,
- &atmel_port->sg_rx,
- 1,
- DMA_FROM_DEVICE);
+ dma_sync_single_for_cpu(port->dev, atmel_port->rx_phys,
+ ATMEL_SERIAL_RX_SIZE, DMA_FROM_DEVICE);
/*
* ring->head points to the end of data already written by the DMA.
@@ -1139,8 +1132,8 @@ static void atmel_rx_from_dma(struct uart_port *port)
* The current transfer size should not be larger than the dma buffer
* length.
*/
- ring->head = sg_dma_len(&atmel_port->sg_rx) - state.residue;
- BUG_ON(ring->head > sg_dma_len(&atmel_port->sg_rx));
+ ring->head = ATMEL_SERIAL_RX_SIZE - state.residue;
+ BUG_ON(ring->head > ATMEL_SERIAL_RX_SIZE);
/*
* At this point ring->head may point to the first byte right after the
* last byte of the dma buffer:
@@ -1154,7 +1147,7 @@ static void atmel_rx_from_dma(struct uart_port *port)
* tail to the end of the buffer then reset tail.
*/
if (ring->head < ring->tail) {
- count = sg_dma_len(&atmel_port->sg_rx) - ring->tail;
+ count = ATMEL_SERIAL_RX_SIZE - ring->tail;
tty_insert_flip_string(tport, ring->buf + ring->tail, count);
ring->tail = 0;
@@ -1167,17 +1160,15 @@ static void atmel_rx_from_dma(struct uart_port *port)
tty_insert_flip_string(tport, ring->buf + ring->tail, count);
/* Wrap ring->head if needed */
- if (ring->head >= sg_dma_len(&atmel_port->sg_rx))
+ if (ring->head >= ATMEL_SERIAL_RX_SIZE)
ring->head = 0;
ring->tail = ring->head;
port->icount.rx += count;
}
/* USART retreives ownership of RX DMA buffer */
- dma_sync_sg_for_device(port->dev,
- &atmel_port->sg_rx,
- 1,
- DMA_FROM_DEVICE);
+ dma_sync_single_for_device(port->dev, atmel_port->rx_phys,
+ ATMEL_SERIAL_RX_SIZE, DMA_FROM_DEVICE);
tty_flip_buffer_push(tport);
@@ -1193,7 +1184,7 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
struct dma_slave_config config;
struct circ_buf *ring;
struct dma_chan *chan;
- int ret, nent;
+ int ret;
ring = &atmel_port->rx_ring;
@@ -1210,26 +1201,18 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
dma_chan_name(atmel_port->chan_rx));
spin_lock_init(&atmel_port->lock_rx);
- sg_init_table(&atmel_port->sg_rx, 1);
/* UART circular rx buffer is an aligned page. */
BUG_ON(!PAGE_ALIGNED(ring->buf));
- sg_set_page(&atmel_port->sg_rx,
- virt_to_page(ring->buf),
- sizeof(struct atmel_uart_char) * ATMEL_SERIAL_RINGSIZE,
- offset_in_page(ring->buf));
- nent = dma_map_sg(port->dev,
- &atmel_port->sg_rx,
- 1,
- DMA_FROM_DEVICE);
-
- if (!nent) {
+ atmel_port->rx_phys = dma_map_single(port->dev, ring->buf,
+ ATMEL_SERIAL_RX_SIZE,
+ DMA_FROM_DEVICE);
+
+ if (dma_mapping_error(port->dev, atmel_port->rx_phys)) {
dev_dbg(port->dev, "need to release resource of dma\n");
goto chan_err;
} else {
- dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", __func__,
- sg_dma_len(&atmel_port->sg_rx),
- ring->buf,
- &sg_dma_address(&atmel_port->sg_rx));
+ dev_dbg(port->dev, "%s: mapped %zu@%p to %pad\n", __func__,
+ ATMEL_SERIAL_RX_SIZE, ring->buf, &atmel_port->rx_phys);
}
/* Configure the slave DMA */
@@ -1250,9 +1233,9 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
* each one is half ring buffer size
*/
desc = dmaengine_prep_dma_cyclic(atmel_port->chan_rx,
- sg_dma_address(&atmel_port->sg_rx),
- sg_dma_len(&atmel_port->sg_rx),
- sg_dma_len(&atmel_port->sg_rx)/2,
+ atmel_port->rx_phys,
+ ATMEL_SERIAL_RX_SIZE,
+ ATMEL_SERIAL_RX_SIZE / 2,
DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT);
if (!desc) {
@@ -1459,9 +1442,8 @@ static void atmel_release_tx_pdc(struct uart_port *port)
static void atmel_tx_pdc(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
- int count;
/* nothing left to transmit? */
if (atmel_uart_readl(port, ATMEL_PDC_TCR))
@@ -1474,17 +1456,19 @@ static void atmel_tx_pdc(struct uart_port *port)
/* disable PDC transmit */
atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS);
- if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) {
+ if (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(port)) {
+ unsigned int count, tail;
+
dma_sync_single_for_device(port->dev,
pdc->dma_addr,
pdc->dma_size,
DMA_TO_DEVICE);
- count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ count = kfifo_out_linear(&tport->xmit_fifo, &tail,
+ UART_XMIT_SIZE);
pdc->ofs = count;
- atmel_uart_writel(port, ATMEL_PDC_TPR,
- pdc->dma_addr + xmit->tail);
+ atmel_uart_writel(port, ATMEL_PDC_TPR, pdc->dma_addr + tail);
atmel_uart_writel(port, ATMEL_PDC_TCR, count);
/* re-enable PDC transmit */
atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
@@ -1498,7 +1482,7 @@ static void atmel_tx_pdc(struct uart_port *port)
}
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
@@ -1506,9 +1490,9 @@ static int atmel_prepare_tx_pdc(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
- pdc->buf = xmit->buf;
+ pdc->buf = tport->xmit_buf;
pdc->dma_addr = dma_map_single(port->dev,
pdc->buf,
UART_XMIT_SIZE,
@@ -2953,9 +2937,7 @@ static int atmel_serial_probe(struct platform_device *pdev)
if (!atmel_use_pdc_rx(&atmel_port->uart)) {
ret = -ENOMEM;
- data = kmalloc_array(ATMEL_SERIAL_RINGSIZE,
- sizeof(struct atmel_uart_char),
- GFP_KERNEL);
+ data = kmalloc(ATMEL_SERIAL_RX_SIZE, GFP_KERNEL);
if (!data)
goto err_clk_disable_unprepare;
atmel_port->rx_ring.buf = data;
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index 7927725b8957..30425a3d19fb 100644
--- a/drivers/tty/serial/clps711x.c
+++ b/drivers/tty/serial/clps711x.c
@@ -146,7 +146,8 @@ static irqreturn_t uart_clps711x_int_tx(int irq, void *dev_id)
{
struct uart_port *port = dev_id;
struct clps711x_port *s = dev_get_drvdata(port->dev);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
+ unsigned char c;
if (port->x_char) {
writew(port->x_char, port->membase + UARTDR_OFFSET);
@@ -155,7 +156,7 @@ static irqreturn_t uart_clps711x_int_tx(int irq, void *dev_id)
return IRQ_HANDLED;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
if (s->tx_enabled) {
disable_irq_nosync(port->irq);
s->tx_enabled = 0;
@@ -163,18 +164,17 @@ static irqreturn_t uart_clps711x_int_tx(int irq, void *dev_id)
return IRQ_HANDLED;
}
- while (!uart_circ_empty(xmit)) {
+ while (uart_fifo_get(port, &c)) {
u32 sysflg = 0;
- writew(xmit->buf[xmit->tail], port->membase + UARTDR_OFFSET);
- uart_xmit_advance(port, 1);
+ writew(c, port->membase + UARTDR_OFFSET);
regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);
if (sysflg & SYSFLG_UTXFF)
break;
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
return IRQ_HANDLED;
diff --git a/drivers/tty/serial/cpm_uart.c b/drivers/tty/serial/cpm_uart.c
index df56c6c5afd0..a927478f581d 100644
--- a/drivers/tty/serial/cpm_uart.c
+++ b/drivers/tty/serial/cpm_uart.c
@@ -648,7 +648,7 @@ static int cpm_uart_tx_pump(struct uart_port *port)
int count;
struct uart_cpm_port *pinfo =
container_of(port, struct uart_cpm_port, port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
/* Handle xon/xoff */
if (port->x_char) {
@@ -673,7 +673,7 @@ static int cpm_uart_tx_pump(struct uart_port *port)
return 1;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
cpm_uart_stop_tx(port);
return 0;
}
@@ -681,16 +681,10 @@ static int cpm_uart_tx_pump(struct uart_port *port)
/* Pick next descriptor and fill from buffer */
bdp = pinfo->tx_cur;
- while (!(in_be16(&bdp->cbd_sc) & BD_SC_READY) && !uart_circ_empty(xmit)) {
- count = 0;
+ while (!(in_be16(&bdp->cbd_sc) & BD_SC_READY) &&
+ !kfifo_is_empty(&tport->xmit_fifo)) {
p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
- while (count < pinfo->tx_fifosize) {
- *p++ = xmit->buf[xmit->tail];
- uart_xmit_advance(port, 1);
- count++;
- if (uart_circ_empty(xmit))
- break;
- }
+ count = uart_fifo_out(port, p, pinfo->tx_fifosize);
out_be16(&bdp->cbd_datlen, count);
setbits16(&bdp->cbd_sc, BD_SC_READY);
/* Get next BD. */
@@ -701,10 +695,10 @@ static int cpm_uart_tx_pump(struct uart_port *port)
}
pinfo->tx_cur = bdp;
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit)) {
+ if (kfifo_is_empty(&tport->xmit_fifo)) {
cpm_uart_stop_tx(port);
return 0;
}
diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c
index e419c4bde8b7..2ccd13cc0a89 100644
--- a/drivers/tty/serial/digicolor-usart.c
+++ b/drivers/tty/serial/digicolor-usart.c
@@ -179,8 +179,9 @@ static void digicolor_uart_rx(struct uart_port *port)
static void digicolor_uart_tx(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
unsigned long flags;
+ unsigned char c;
if (digicolor_uart_tx_full(port))
return;
@@ -194,20 +195,19 @@ static void digicolor_uart_tx(struct uart_port *port)
goto out;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
digicolor_uart_stop_tx(port);
goto out;
}
- while (!uart_circ_empty(xmit)) {
- writeb(xmit->buf[xmit->tail], port->membase + UA_EMI_REC);
- uart_xmit_advance(port, 1);
+ while (uart_fifo_get(port, &c)) {
+ writeb(c, port->membase + UA_EMI_REC);
if (digicolor_uart_tx_full(port))
break;
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
out:
diff --git a/drivers/tty/serial/dz.c b/drivers/tty/serial/dz.c
index 6df7af9edc1c..eba91daedef8 100644
--- a/drivers/tty/serial/dz.c
+++ b/drivers/tty/serial/dz.c
@@ -252,13 +252,13 @@ static inline void dz_receive_chars(struct dz_mux *mux)
static inline void dz_transmit_chars(struct dz_mux *mux)
{
struct dz_port *dport = &mux->dport[0];
- struct circ_buf *xmit;
+ struct tty_port *tport;
unsigned char tmp;
u16 status;
status = dz_in(dport, DZ_CSR);
dport = &mux->dport[LINE(status)];
- xmit = &dport->port.state->xmit;
+ tport = &dport->port.state->port;
if (dport->port.x_char) { /* XON/XOFF chars */
dz_out(dport, DZ_TDR, dport->port.x_char);
@@ -267,7 +267,8 @@ static inline void dz_transmit_chars(struct dz_mux *mux)
return;
}
/* If nothing to do or stopped or hardware stopped. */
- if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
+ if (uart_tx_stopped(&dport->port) ||
+ !uart_fifo_get(&dport->port, &tmp)) {
uart_port_lock(&dport->port);
dz_stop_tx(&dport->port);
uart_port_unlock(&dport->port);
@@ -278,15 +279,13 @@ static inline void dz_transmit_chars(struct dz_mux *mux)
* If something to do... (remember the dz has no output fifo,
* so we go one char at a time) :-<
*/
- tmp = xmit->buf[xmit->tail];
dz_out(dport, DZ_TDR, tmp);
- uart_xmit_advance(&dport->port, 1);
- if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < DZ_WAKEUP_CHARS)
uart_write_wakeup(&dport->port);
/* Are we are done. */
- if (uart_circ_empty(xmit)) {
+ if (kfifo_is_empty(&tport->xmit_fifo)) {
uart_port_lock(&dport->port);
dz_stop_tx(&dport->port);
uart_port_unlock(&dport->port);
diff --git a/drivers/tty/serial/fsl_linflexuart.c b/drivers/tty/serial/fsl_linflexuart.c
index 5426322b5f0c..e972df4b188d 100644
--- a/drivers/tty/serial/fsl_linflexuart.c
+++ b/drivers/tty/serial/fsl_linflexuart.c
@@ -174,17 +174,18 @@ static void linflex_put_char(struct uart_port *sport, unsigned char c)
static inline void linflex_transmit_buffer(struct uart_port *sport)
{
- struct circ_buf *xmit = &sport->state->xmit;
+ struct tty_port *tport = &sport->state->port;
+ unsigned char c;
- while (!uart_circ_empty(xmit)) {
- linflex_put_char(sport, xmit->buf[xmit->tail]);
- uart_xmit_advance(sport, 1);
+ while (uart_fifo_get(sport, &c)) {
+ linflex_put_char(sport, c);
+ sport->icount.tx++;
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(sport);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
linflex_stop_tx(sport);
}
@@ -200,7 +201,7 @@ static void linflex_start_tx(struct uart_port *port)
static irqreturn_t linflex_txint(int irq, void *dev_id)
{
struct uart_port *sport = dev_id;
- struct circ_buf *xmit = &sport->state->xmit;
+ struct tty_port *tport = &sport->state->port;
unsigned long flags;
uart_port_lock_irqsave(sport, &flags);
@@ -210,7 +211,7 @@ static irqreturn_t linflex_txint(int irq, void *dev_id)
goto out;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(sport)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(sport)) {
linflex_stop_tx(sport);
goto out;
}
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index bbcbc91482af..615291ea9b5e 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -7,6 +7,7 @@
#include <linux/bitfield.h>
#include <linux/bits.h>
+#include <linux/circ_buf.h>
#include <linux/clk.h>
#include <linux/console.h>
#include <linux/delay.h>
@@ -473,7 +474,7 @@ static void lpuart32_stop_rx(struct uart_port *port)
static void lpuart_dma_tx(struct lpuart_port *sport)
{
- struct circ_buf *xmit = &sport->port.state->xmit;
+ struct tty_port *tport = &sport->port.state->port;
struct scatterlist *sgl = sport->tx_sgl;
struct device *dev = sport->port.dev;
struct dma_chan *chan = sport->dma_tx_chan;
@@ -482,18 +483,10 @@ static void lpuart_dma_tx(struct lpuart_port *sport)
if (sport->dma_tx_in_progress)
return;
- sport->dma_tx_bytes = uart_circ_chars_pending(xmit);
-
- if (xmit->tail < xmit->head || xmit->head == 0) {
- sport->dma_tx_nents = 1;
- sg_init_one(sgl, xmit->buf + xmit->tail, sport->dma_tx_bytes);
- } else {
- sport->dma_tx_nents = 2;
- sg_init_table(sgl, 2);
- sg_set_buf(sgl, xmit->buf + xmit->tail,
- UART_XMIT_SIZE - xmit->tail);
- sg_set_buf(sgl + 1, xmit->buf, xmit->head);
- }
+ sg_init_table(sgl, ARRAY_SIZE(sport->tx_sgl));
+ sport->dma_tx_bytes = kfifo_len(&tport->xmit_fifo);
+ sport->dma_tx_nents = kfifo_dma_out_prepare(&tport->xmit_fifo, sgl,
+ ARRAY_SIZE(sport->tx_sgl), sport->dma_tx_bytes);
ret = dma_map_sg(chan->device->dev, sgl, sport->dma_tx_nents,
DMA_TO_DEVICE);
@@ -521,14 +514,15 @@ static void lpuart_dma_tx(struct lpuart_port *sport)
static bool lpuart_stopped_or_empty(struct uart_port *port)
{
- return uart_circ_empty(&port->state->xmit) || uart_tx_stopped(port);
+ return kfifo_is_empty(&port->state->port.xmit_fifo) ||
+ uart_tx_stopped(port);
}
static void lpuart_dma_tx_complete(void *arg)
{
struct lpuart_port *sport = arg;
struct scatterlist *sgl = &sport->tx_sgl[0];
- struct circ_buf *xmit = &sport->port.state->xmit;
+ struct tty_port *tport = &sport->port.state->port;
struct dma_chan *chan = sport->dma_tx_chan;
unsigned long flags;
@@ -545,7 +539,7 @@ static void lpuart_dma_tx_complete(void *arg)
sport->dma_tx_in_progress = false;
uart_port_unlock_irqrestore(&sport->port, flags);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
if (waitqueue_active(&sport->dma_wait)) {
@@ -756,8 +750,9 @@ static inline void lpuart_transmit_buffer(struct lpuart_port *sport)
static inline void lpuart32_transmit_buffer(struct lpuart_port *sport)
{
- struct circ_buf *xmit = &sport->port.state->xmit;
+ struct tty_port *tport = &sport->port.state->port;
unsigned long txcnt;
+ unsigned char c;
if (sport->port.x_char) {
lpuart32_write(&sport->port, sport->port.x_char, UARTDATA);
@@ -774,18 +769,18 @@ static inline void lpuart32_transmit_buffer(struct lpuart_port *sport)
txcnt = lpuart32_read(&sport->port, UARTWATER);
txcnt = txcnt >> UARTWATER_TXCNT_OFF;
txcnt &= UARTWATER_COUNT_MASK;
- while (!uart_circ_empty(xmit) && (txcnt < sport->txfifo_size)) {
- lpuart32_write(&sport->port, xmit->buf[xmit->tail], UARTDATA);
- uart_xmit_advance(&sport->port, 1);
+ while (txcnt < sport->txfifo_size &&
+ uart_fifo_get(&sport->port, &c)) {
+ lpuart32_write(&sport->port, c, UARTDATA);
txcnt = lpuart32_read(&sport->port, UARTWATER);
txcnt = txcnt >> UARTWATER_TXCNT_OFF;
txcnt &= UARTWATER_COUNT_MASK;
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
lpuart32_stop_tx(&sport->port);
}
@@ -2884,8 +2879,7 @@ static int lpuart_probe(struct platform_device *pdev)
sport->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(sport->ipg_clk)) {
ret = PTR_ERR(sport->ipg_clk);
- dev_err(&pdev->dev, "failed to get uart ipg clk: %d\n", ret);
- return ret;
+ return dev_err_probe(&pdev->dev, ret, "failed to get uart ipg clk\n");
}
sport->baud_clk = NULL;
@@ -2893,8 +2887,7 @@ static int lpuart_probe(struct platform_device *pdev)
sport->baud_clk = devm_clk_get(&pdev->dev, "baud");
if (IS_ERR(sport->baud_clk)) {
ret = PTR_ERR(sport->baud_clk);
- dev_err(&pdev->dev, "failed to get uart baud clk: %d\n", ret);
- return ret;
+ return dev_err_probe(&pdev->dev, ret, "failed to get uart baud clk\n");
}
}
diff --git a/drivers/tty/serial/icom.c b/drivers/tty/serial/icom.c
index a75eafbcbea3..29e42831df39 100644
--- a/drivers/tty/serial/icom.c
+++ b/drivers/tty/serial/icom.c
@@ -877,10 +877,10 @@ unlock:
static int icom_write(struct uart_port *port)
{
struct icom_port *icom_port = to_icom_port(port);
+ struct tty_port *tport = &port->state->port;
unsigned long data_count;
unsigned char cmdReg;
unsigned long offset;
- int temp_tail = port->state->xmit.tail;
trace(icom_port, "WRITE", 0);
@@ -890,16 +890,8 @@ static int icom_write(struct uart_port *port)
return 0;
}
- data_count = 0;
- while ((port->state->xmit.head != temp_tail) &&
- (data_count <= XMIT_BUFF_SZ)) {
-
- icom_port->xmit_buf[data_count++] =
- port->state->xmit.buf[temp_tail];
-
- temp_tail++;
- temp_tail &= (UART_XMIT_SIZE - 1);
- }
+ data_count = kfifo_out_peek(&tport->xmit_fifo, icom_port->xmit_buf,
+ XMIT_BUFF_SZ);
if (data_count) {
icom_port->statStg->xmit[0].flags =
@@ -956,7 +948,8 @@ static inline void check_modem_status(struct icom_port *icom_port)
static void xmit_interrupt(u16 port_int_reg, struct icom_port *icom_port)
{
- u16 count, i;
+ struct tty_port *tport = &icom_port->uart_port.state->port;
+ u16 count;
if (port_int_reg & (INT_XMIT_COMPLETED)) {
trace(icom_port, "XMIT_COMPLETE", 0);
@@ -968,13 +961,7 @@ static void xmit_interrupt(u16 port_int_reg, struct icom_port *icom_port)
count = le16_to_cpu(icom_port->statStg->xmit[0].leLength);
icom_port->uart_port.icount.tx += count;
- for (i=0; i<count &&
- !uart_circ_empty(&icom_port->uart_port.state->xmit); i++) {
-
- icom_port->uart_port.state->xmit.tail++;
- icom_port->uart_port.state->xmit.tail &=
- (UART_XMIT_SIZE - 1);
- }
+ kfifo_skip_count(&tport->xmit_fifo, count);
if (!icom_write(&icom_port->uart_port))
/* activate write queue */
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index e14813250616..2eb22594960f 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -8,6 +8,7 @@
* Copyright (C) 2004 Pengutronix
*/
+#include <linux/circ_buf.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
@@ -26,6 +27,7 @@
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/io.h>
+#include <linux/iopoll.h>
#include <linux/dma-mapping.h>
#include <asm/irq.h>
@@ -521,7 +523,8 @@ static void imx_uart_dma_tx(struct imx_port *sport);
/* called with port.lock taken and irqs off */
static inline void imx_uart_transmit_buffer(struct imx_port *sport)
{
- struct circ_buf *xmit = &sport->port.state->xmit;
+ struct tty_port *tport = &sport->port.state->port;
+ unsigned char c;
if (sport->port.x_char) {
/* Send next char */
@@ -531,7 +534,8 @@ static inline void imx_uart_transmit_buffer(struct imx_port *sport)
return;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) ||
+ uart_tx_stopped(&sport->port)) {
imx_uart_stop_tx(&sport->port);
return;
}
@@ -555,26 +559,22 @@ static inline void imx_uart_transmit_buffer(struct imx_port *sport)
return;
}
- while (!uart_circ_empty(xmit) &&
- !(imx_uart_readl(sport, imx_uart_uts_reg(sport)) & UTS_TXFULL)) {
- /* send xmit->buf[xmit->tail]
- * out the port here */
- imx_uart_writel(sport, xmit->buf[xmit->tail], URTX0);
- uart_xmit_advance(&sport->port, 1);
- }
+ while (!(imx_uart_readl(sport, imx_uart_uts_reg(sport)) & UTS_TXFULL) &&
+ uart_fifo_get(&sport->port, &c))
+ imx_uart_writel(sport, c, URTX0);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
imx_uart_stop_tx(&sport->port);
}
static void imx_uart_dma_tx_callback(void *data)
{
struct imx_port *sport = data;
+ struct tty_port *tport = &sport->port.state->port;
struct scatterlist *sgl = &sport->tx_sgl[0];
- struct circ_buf *xmit = &sport->port.state->xmit;
unsigned long flags;
u32 ucr1;
@@ -592,10 +592,11 @@ static void imx_uart_dma_tx_callback(void *data)
sport->dma_is_txing = 0;
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
- if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port))
+ if (!kfifo_is_empty(&tport->xmit_fifo) &&
+ !uart_tx_stopped(&sport->port))
imx_uart_dma_tx(sport);
else if (sport->port.rs485.flags & SER_RS485_ENABLED) {
u32 ucr4 = imx_uart_readl(sport, UCR4);
@@ -609,7 +610,7 @@ static void imx_uart_dma_tx_callback(void *data)
/* called with port.lock taken and irqs off */
static void imx_uart_dma_tx(struct imx_port *sport)
{
- struct circ_buf *xmit = &sport->port.state->xmit;
+ struct tty_port *tport = &sport->port.state->port;
struct scatterlist *sgl = sport->tx_sgl;
struct dma_async_tx_descriptor *desc;
struct dma_chan *chan = sport->dma_chan_tx;
@@ -624,18 +625,10 @@ static void imx_uart_dma_tx(struct imx_port *sport)
ucr4 &= ~UCR4_TCEN;
imx_uart_writel(sport, ucr4, UCR4);
- sport->tx_bytes = uart_circ_chars_pending(xmit);
-
- if (xmit->tail < xmit->head || xmit->head == 0) {
- sport->dma_tx_nents = 1;
- sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes);
- } else {
- sport->dma_tx_nents = 2;
- sg_init_table(sgl, 2);
- sg_set_buf(sgl, xmit->buf + xmit->tail,
- UART_XMIT_SIZE - xmit->tail);
- sg_set_buf(sgl + 1, xmit->buf, xmit->head);
- }
+ sg_init_table(sgl, ARRAY_SIZE(sport->tx_sgl));
+ sport->tx_bytes = kfifo_len(&tport->xmit_fifo);
+ sport->dma_tx_nents = kfifo_dma_out_prepare(&tport->xmit_fifo, sgl,
+ ARRAY_SIZE(sport->tx_sgl), sport->tx_bytes);
ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
if (ret == 0) {
@@ -653,8 +646,7 @@ static void imx_uart_dma_tx(struct imx_port *sport)
desc->callback = imx_uart_dma_tx_callback;
desc->callback_param = sport;
- dev_dbg(dev, "TX: prepare to send %lu bytes by DMA.\n",
- uart_circ_chars_pending(xmit));
+ dev_dbg(dev, "TX: prepare to send %u bytes by DMA.\n", sport->tx_bytes);
ucr1 = imx_uart_readl(sport, UCR1);
ucr1 |= UCR1_TXDMAEN;
@@ -671,9 +663,10 @@ static void imx_uart_dma_tx(struct imx_port *sport)
static void imx_uart_start_tx(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
+ struct tty_port *tport = &sport->port.state->port;
u32 ucr1;
- if (!sport->port.x_char && uart_circ_empty(&port->state->xmit))
+ if (!sport->port.x_char && kfifo_is_empty(&tport->xmit_fifo))
return;
/*
@@ -749,7 +742,7 @@ static void imx_uart_start_tx(struct uart_port *port)
return;
}
- if (!uart_circ_empty(&port->state->xmit) &&
+ if (!kfifo_is_empty(&tport->xmit_fifo) &&
!uart_tx_stopped(port))
imx_uart_dma_tx(sport);
return;
@@ -1312,7 +1305,7 @@ static void imx_uart_clear_rx_errors(struct imx_port *sport)
}
-#define TXTL_DEFAULT 2 /* reset default */
+#define TXTL_DEFAULT 8
#define RXTL_DEFAULT 8 /* 8 characters or aging timer */
#define TXTL_DMA 8 /* DMA burst setting */
#define RXTL_DMA 9 /* DMA burst setting */
@@ -2010,7 +2003,7 @@ imx_uart_console_write(struct console *co, const char *s, unsigned int count)
struct imx_port *sport = imx_uart_ports[co->index];
struct imx_port_ucrs old_ucr;
unsigned long flags;
- unsigned int ucr1;
+ unsigned int ucr1, usr2;
int locked = 1;
if (sport->port.sysrq)
@@ -2041,8 +2034,8 @@ imx_uart_console_write(struct console *co, const char *s, unsigned int count)
* Finally, wait for transmitter to become empty
* and restore UCR1/2/3
*/
- while (!(imx_uart_readl(sport, USR2) & USR2_TXDC));
-
+ read_poll_timeout_atomic(imx_uart_readl, usr2, usr2 & USR2_TXDC,
+ 0, USEC_PER_SEC, false, sport, USR2);
imx_uart_ucrs_restore(sport, &old_ucr);
if (locked)
diff --git a/drivers/tty/serial/ip22zilog.c b/drivers/tty/serial/ip22zilog.c
index 320b29cd4683..c2cae50f06f3 100644
--- a/drivers/tty/serial/ip22zilog.c
+++ b/drivers/tty/serial/ip22zilog.c
@@ -355,7 +355,8 @@ static void ip22zilog_status_handle(struct uart_ip22zilog_port *up,
static void ip22zilog_transmit_chars(struct uart_ip22zilog_port *up,
struct zilog_channel *channel)
{
- struct circ_buf *xmit;
+ struct tty_port *tport;
+ unsigned char c;
if (ZS_IS_CONS(up)) {
unsigned char status = readb(&channel->control);
@@ -398,20 +399,18 @@ static void ip22zilog_transmit_chars(struct uart_ip22zilog_port *up,
if (up->port.state == NULL)
goto ack_tx_int;
- xmit = &up->port.state->xmit;
- if (uart_circ_empty(xmit))
- goto ack_tx_int;
+ tport = &up->port.state->port;
if (uart_tx_stopped(&up->port))
goto ack_tx_int;
+ if (!uart_fifo_get(&up->port, &c))
+ goto ack_tx_int;
up->flags |= IP22ZILOG_FLAG_TX_ACTIVE;
- writeb(xmit->buf[xmit->tail], &channel->data);
+ writeb(c, &channel->data);
ZSDELAY();
ZS_WSYNC(channel);
- uart_xmit_advance(&up->port, 1);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
return;
@@ -600,17 +599,16 @@ static void ip22zilog_start_tx(struct uart_port *port)
port->icount.tx++;
port->x_char = 0;
} else {
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
+ unsigned char c;
- if (uart_circ_empty(xmit))
+ if (!uart_fifo_get(port, &c))
return;
- writeb(xmit->buf[xmit->tail], &channel->data);
+ writeb(c, &channel->data);
ZSDELAY();
ZS_WSYNC(channel);
- uart_xmit_advance(port, 1);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
}
}
diff --git a/drivers/tty/serial/jsm/jsm_cls.c b/drivers/tty/serial/jsm/jsm_cls.c
index ddbd42c09637..6e40792f92cf 100644
--- a/drivers/tty/serial/jsm/jsm_cls.c
+++ b/drivers/tty/serial/jsm/jsm_cls.c
@@ -443,20 +443,14 @@ static void cls_copy_data_from_uart_to_queue(struct jsm_channel *ch)
static void cls_copy_data_from_queue_to_uart(struct jsm_channel *ch)
{
- u16 tail;
+ struct tty_port *tport;
int n;
- int qlen;
u32 len_written = 0;
- struct circ_buf *circ;
if (!ch)
return;
- circ = &ch->uart_port.state->xmit;
-
- /* No data to write to the UART */
- if (uart_circ_empty(circ))
- return;
+ tport = &ch->uart_port.state->port;
/* If port is "stopped", don't send any data to the UART */
if ((ch->ch_flags & CH_STOP) || (ch->ch_flags & CH_BREAK_SENDING))
@@ -467,29 +461,22 @@ static void cls_copy_data_from_queue_to_uart(struct jsm_channel *ch)
return;
n = 32;
+ while (n > 0) {
+ unsigned char c;
- /* cache tail of queue */
- tail = circ->tail & (UART_XMIT_SIZE - 1);
- qlen = uart_circ_chars_pending(circ);
-
- /* Find minimum of the FIFO space, versus queue length */
- n = min(n, qlen);
+ if (!kfifo_get(&tport->xmit_fifo, &c))
+ break;
- while (n > 0) {
- writeb(circ->buf[tail], &ch->ch_cls_uart->txrx);
- tail = (tail + 1) & (UART_XMIT_SIZE - 1);
+ writeb(c, &ch->ch_cls_uart->txrx);
n--;
ch->ch_txcount++;
len_written++;
}
- /* Update the final tail */
- circ->tail = tail & (UART_XMIT_SIZE - 1);
-
if (len_written > ch->ch_t_tlevel)
ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
- if (uart_circ_empty(circ))
+ if (kfifo_is_empty(&tport->xmit_fifo))
uart_write_wakeup(&ch->uart_port);
}
diff --git a/drivers/tty/serial/jsm/jsm_neo.c b/drivers/tty/serial/jsm/jsm_neo.c
index 1fa10f19368f..e8e13bf056e2 100644
--- a/drivers/tty/serial/jsm/jsm_neo.c
+++ b/drivers/tty/serial/jsm/jsm_neo.c
@@ -474,21 +474,21 @@ static void neo_copy_data_from_uart_to_queue(struct jsm_channel *ch)
static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch)
{
- u16 head;
- u16 tail;
+ struct tty_port *tport;
+ unsigned char *tail;
+ unsigned char c;
int n;
int s;
int qlen;
u32 len_written = 0;
- struct circ_buf *circ;
if (!ch)
return;
- circ = &ch->uart_port.state->xmit;
+ tport = &ch->uart_port.state->port;
/* No data to write to the UART */
- if (uart_circ_empty(circ))
+ if (kfifo_is_empty(&tport->xmit_fifo))
return;
/* If port is "stopped", don't send any data to the UART */
@@ -504,10 +504,9 @@ static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch)
if (ch->ch_cached_lsr & UART_LSR_THRE) {
ch->ch_cached_lsr &= ~(UART_LSR_THRE);
- writeb(circ->buf[circ->tail], &ch->ch_neo_uart->txrx);
- jsm_dbg(WRITE, &ch->ch_bd->pci_dev,
- "Tx data: %x\n", circ->buf[circ->tail]);
- circ->tail = (circ->tail + 1) & (UART_XMIT_SIZE - 1);
+ WARN_ON_ONCE(!kfifo_get(&tport->xmit_fifo, &c));
+ writeb(c, &ch->ch_neo_uart->txrx);
+ jsm_dbg(WRITE, &ch->ch_bd->pci_dev, "Tx data: %x\n", c);
ch->ch_txcount++;
}
return;
@@ -520,38 +519,27 @@ static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch)
return;
n = UART_17158_TX_FIFOSIZE - ch->ch_t_tlevel;
-
- /* cache head and tail of queue */
- head = circ->head & (UART_XMIT_SIZE - 1);
- tail = circ->tail & (UART_XMIT_SIZE - 1);
- qlen = uart_circ_chars_pending(circ);
+ qlen = kfifo_len(&tport->xmit_fifo);
/* Find minimum of the FIFO space, versus queue length */
n = min(n, qlen);
while (n > 0) {
-
- s = ((head >= tail) ? head : UART_XMIT_SIZE) - tail;
- s = min(s, n);
-
+ s = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail, n);
if (s <= 0)
break;
- memcpy_toio(&ch->ch_neo_uart->txrxburst, circ->buf + tail, s);
- /* Add and flip queue if needed */
- tail = (tail + s) & (UART_XMIT_SIZE - 1);
+ memcpy_toio(&ch->ch_neo_uart->txrxburst, tail, s);
+ kfifo_skip_count(&tport->xmit_fifo, s);
n -= s;
ch->ch_txcount += s;
len_written += s;
}
- /* Update the final tail */
- circ->tail = tail & (UART_XMIT_SIZE - 1);
-
if (len_written >= ch->ch_t_tlevel)
ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
- if (uart_circ_empty(circ))
+ if (kfifo_is_empty(&tport->xmit_fifo))
uart_write_wakeup(&ch->uart_port);
}
diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c
index 5efb2b593be3..fda63918d1eb 100644
--- a/drivers/tty/serial/max3100.c
+++ b/drivers/tty/serial/max3100.c
@@ -1,6 +1,5 @@
// SPDX-License-Identifier: GPL-2.0+
/*
- *
* Copyright (C) 2008 Christian Pellegrin <chripell@evolware.org>
*
* Notes: the MAX3100 doesn't provide an interrupt on CTS so we have
@@ -8,24 +7,6 @@
* writing conf clears FIFO buffer and we cannot have this interrupt
* always asking us for attention.
*
- * Example platform data:
-
- static struct plat_max3100 max3100_plat_data = {
- .loopback = 0,
- .crystal = 0,
- .poll_time = 100,
- };
-
- static struct spi_board_info spi_board_info[] = {
- {
- .modalias = "max3100",
- .platform_data = &max3100_plat_data,
- .irq = IRQ_EINT12,
- .max_speed_hz = 5*1000*1000,
- .chip_select = 0,
- },
- };
-
* The initial minor number is 209 in the low-density serial port:
* mknod /dev/ttyMAX0 c 204 209
*/
@@ -35,18 +16,23 @@
/* 4 MAX3100s should be enough for everyone */
#define MAX_MAX3100 4
+#include <linux/container_of.h>
#include <linux/delay.h>
-#include <linux/slab.h>
#include <linux/device.h>
+#include <linux/freezer.h>
+#include <linux/mod_devicetable.h>
#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/property.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
+#include <linux/slab.h>
#include <linux/spi/spi.h>
-#include <linux/freezer.h>
-#include <linux/tty.h>
#include <linux/tty_flip.h>
+#include <linux/tty.h>
+#include <linux/types.h>
-#include <linux/serial_max3100.h>
+#include <asm/unaligned.h>
#define MAX3100_C (1<<14)
#define MAX3100_D (0<<14)
@@ -110,10 +96,8 @@ struct max3100_port {
#define MAX3100_7BIT 4
int rx_enabled; /* if we should rx chars */
- int irq; /* irq assigned to the max3100 */
-
int minor; /* minor number */
- int crystal; /* 1 if 3.6864Mhz crystal 0 for 1.8432 */
+ int loopback_commit; /* need to change loopback */
int loopback; /* 1 if we are in loopback mode */
/* for handling irqs: need workqueue since we do spi_sync */
@@ -124,15 +108,14 @@ struct max3100_port {
/* need to know we are suspending to avoid deadlock on workqueue */
int suspending;
- /* hook for suspending MAX3100 via dedicated pin */
- void (*max3100_hw_suspend) (int suspend);
-
- /* poll time (in ms) for ctrl lines */
- int poll_time;
- /* and its timer */
struct timer_list timer;
};
+static inline struct max3100_port *to_max3100_port(struct uart_port *port)
+{
+ return container_of(port, struct max3100_port, port);
+}
+
static struct max3100_port *max3100s[MAX_MAX3100]; /* the chips */
static DEFINE_MUTEX(max3100s_lock); /* race on probe */
@@ -170,28 +153,10 @@ static void max3100_calc_parity(struct max3100_port *s, u16 *c)
*c |= max3100_do_parity(s, *c) << 8;
}
-static void max3100_work(struct work_struct *w);
-
-static void max3100_dowork(struct max3100_port *s)
-{
- if (!s->force_end_work && !freezing(current) && !s->suspending)
- queue_work(s->workqueue, &s->work);
-}
-
-static void max3100_timeout(struct timer_list *t)
-{
- struct max3100_port *s = from_timer(s, t, timer);
-
- if (s->port.state) {
- max3100_dowork(s);
- mod_timer(&s->timer, jiffies + s->poll_time);
- }
-}
-
static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx)
{
struct spi_message message;
- u16 etx, erx;
+ __be16 etx, erx;
int status;
struct spi_transfer tran = {
.tx_buf = &etx,
@@ -213,7 +178,7 @@ static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx)
return 0;
}
-static int max3100_handlerx(struct max3100_port *s, u16 rx)
+static int max3100_handlerx_unlocked(struct max3100_port *s, u16 rx)
{
unsigned int status = 0;
int ret = 0, cts;
@@ -254,13 +219,25 @@ static int max3100_handlerx(struct max3100_port *s, u16 rx)
return ret;
}
+static int max3100_handlerx(struct max3100_port *s, u16 rx)
+{
+ unsigned long flags;
+ int ret;
+
+ uart_port_lock_irqsave(&s->port, &flags);
+ ret = max3100_handlerx_unlocked(s, rx);
+ uart_port_unlock_irqrestore(&s->port, flags);
+ return ret;
+}
+
static void max3100_work(struct work_struct *w)
{
struct max3100_port *s = container_of(w, struct max3100_port, work);
+ struct tty_port *tport = &s->port.state->port;
+ unsigned char ch;
+ int conf, cconf, cloopback, crts;
int rxchars;
u16 tx, rx;
- int conf, cconf, crts;
- struct circ_buf *xmit = &s->port.state->xmit;
dev_dbg(&s->spi->dev, "%s\n", __func__);
@@ -270,11 +247,15 @@ static void max3100_work(struct work_struct *w)
conf = s->conf;
cconf = s->conf_commit;
s->conf_commit = 0;
+ cloopback = s->loopback_commit;
+ s->loopback_commit = 0;
crts = s->rts_commit;
s->rts_commit = 0;
spin_unlock(&s->conf_lock);
if (cconf)
max3100_sr(s, MAX3100_WC | conf, &rx);
+ if (cloopback)
+ max3100_sr(s, 0x4001, &rx);
if (crts) {
max3100_sr(s, MAX3100_WD | MAX3100_TE |
(s->rts ? MAX3100_RTS : 0), &rx);
@@ -290,10 +271,9 @@ static void max3100_work(struct work_struct *w)
tx = s->port.x_char;
s->port.icount.tx++;
s->port.x_char = 0;
- } else if (!uart_circ_empty(xmit) &&
- !uart_tx_stopped(&s->port)) {
- tx = xmit->buf[xmit->tail];
- uart_xmit_advance(&s->port, 1);
+ } else if (!uart_tx_stopped(&s->port) &&
+ uart_fifo_get(&s->port, &ch)) {
+ tx = ch;
}
if (tx != 0xffff) {
max3100_calc_parity(s, &tx);
@@ -307,19 +287,33 @@ static void max3100_work(struct work_struct *w)
tty_flip_buffer_push(&s->port.state->port);
rxchars = 0;
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&s->port);
} while (!s->force_end_work &&
!freezing(current) &&
((rx & MAX3100_R) ||
- (!uart_circ_empty(xmit) &&
+ (!kfifo_is_empty(&tport->xmit_fifo) &&
!uart_tx_stopped(&s->port))));
if (rxchars > 0)
tty_flip_buffer_push(&s->port.state->port);
}
+static void max3100_dowork(struct max3100_port *s)
+{
+ if (!s->force_end_work && !freezing(current) && !s->suspending)
+ queue_work(s->workqueue, &s->work);
+}
+
+static void max3100_timeout(struct timer_list *t)
+{
+ struct max3100_port *s = from_timer(s, t, timer);
+
+ max3100_dowork(s);
+ mod_timer(&s->timer, jiffies + uart_poll_timeout(&s->port));
+}
+
static irqreturn_t max3100_irq(int irqno, void *dev_id)
{
struct max3100_port *s = dev_id;
@@ -332,20 +326,15 @@ static irqreturn_t max3100_irq(int irqno, void *dev_id)
static void max3100_enable_ms(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
- if (s->poll_time > 0)
- mod_timer(&s->timer, jiffies);
+ mod_timer(&s->timer, jiffies);
dev_dbg(&s->spi->dev, "%s\n", __func__);
}
static void max3100_start_tx(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
dev_dbg(&s->spi->dev, "%s\n", __func__);
@@ -354,9 +343,7 @@ static void max3100_start_tx(struct uart_port *port)
static void max3100_stop_rx(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
dev_dbg(&s->spi->dev, "%s\n", __func__);
@@ -370,9 +357,7 @@ static void max3100_stop_rx(struct uart_port *port)
static unsigned int max3100_tx_empty(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
dev_dbg(&s->spi->dev, "%s\n", __func__);
@@ -383,9 +368,7 @@ static unsigned int max3100_tx_empty(struct uart_port *port)
static unsigned int max3100_get_mctrl(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
dev_dbg(&s->spi->dev, "%s\n", __func__);
@@ -397,21 +380,25 @@ static unsigned int max3100_get_mctrl(struct uart_port *port)
static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
- int rts;
+ struct max3100_port *s = to_max3100_port(port);
+ int loopback, rts;
dev_dbg(&s->spi->dev, "%s\n", __func__);
+ loopback = (mctrl & TIOCM_LOOP) > 0;
rts = (mctrl & TIOCM_RTS) > 0;
spin_lock(&s->conf_lock);
+ if (s->loopback != loopback) {
+ s->loopback = loopback;
+ s->loopback_commit = 1;
+ }
if (s->rts != rts) {
s->rts = rts;
s->rts_commit = 1;
- max3100_dowork(s);
}
+ if (s->loopback_commit || s->rts_commit)
+ max3100_dowork(s);
spin_unlock(&s->conf_lock);
}
@@ -419,10 +406,9 @@ static void
max3100_set_termios(struct uart_port *port, struct ktermios *termios,
const struct ktermios *old)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
- int baud = 0;
+ struct max3100_port *s = to_max3100_port(port);
+ unsigned int baud = port->uartclk / 16;
+ unsigned int baud230400 = (baud == 230400) ? 1 : 0;
unsigned cflag;
u32 param_new, param_mask, parity = 0;
@@ -435,40 +421,40 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios,
param_new = s->conf & MAX3100_BAUD;
switch (baud) {
case 300:
- if (s->crystal)
+ if (baud230400)
baud = s->baud;
else
param_new = 15;
break;
case 600:
- param_new = 14 + s->crystal;
+ param_new = 14 + baud230400;
break;
case 1200:
- param_new = 13 + s->crystal;
+ param_new = 13 + baud230400;
break;
case 2400:
- param_new = 12 + s->crystal;
+ param_new = 12 + baud230400;
break;
case 4800:
- param_new = 11 + s->crystal;
+ param_new = 11 + baud230400;
break;
case 9600:
- param_new = 10 + s->crystal;
+ param_new = 10 + baud230400;
break;
case 19200:
- param_new = 9 + s->crystal;
+ param_new = 9 + baud230400;
break;
case 38400:
- param_new = 8 + s->crystal;
+ param_new = 8 + baud230400;
break;
case 57600:
- param_new = 1 + s->crystal;
+ param_new = 1 + baud230400;
break;
case 115200:
- param_new = 0 + s->crystal;
+ param_new = 0 + baud230400;
break;
case 230400:
- if (s->crystal)
+ if (baud230400)
param_new = 0;
else
baud = s->baud;
@@ -520,9 +506,7 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios,
MAX3100_STATUS_PE | MAX3100_STATUS_FE |
MAX3100_STATUS_OE;
- if (s->poll_time > 0)
- del_timer_sync(&s->timer);
-
+ del_timer_sync(&s->timer);
uart_update_timeout(port, termios->c_cflag, baud);
spin_lock(&s->conf_lock);
@@ -538,9 +522,8 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios,
static void max3100_shutdown(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
+ u16 rx;
dev_dbg(&s->spi->dev, "%s\n", __func__);
@@ -549,38 +532,29 @@ static void max3100_shutdown(struct uart_port *port)
s->force_end_work = 1;
- if (s->poll_time > 0)
- del_timer_sync(&s->timer);
+ del_timer_sync(&s->timer);
if (s->workqueue) {
destroy_workqueue(s->workqueue);
s->workqueue = NULL;
}
- if (s->irq)
- free_irq(s->irq, s);
+ if (port->irq)
+ free_irq(port->irq, s);
/* set shutdown mode to save power */
- if (s->max3100_hw_suspend)
- s->max3100_hw_suspend(1);
- else {
- u16 tx, rx;
-
- tx = MAX3100_WC | MAX3100_SHDN;
- max3100_sr(s, tx, &rx);
- }
+ max3100_sr(s, MAX3100_WC | MAX3100_SHDN, &rx);
}
static int max3100_startup(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
char b[12];
+ int ret;
dev_dbg(&s->spi->dev, "%s\n", __func__);
s->conf = MAX3100_RM;
- s->baud = s->crystal ? 230400 : 115200;
+ s->baud = port->uartclk / 16;
s->rx_enabled = 1;
if (s->suspending)
@@ -598,23 +572,15 @@ static int max3100_startup(struct uart_port *port)
}
INIT_WORK(&s->work, max3100_work);
- if (request_irq(s->irq, max3100_irq,
- IRQF_TRIGGER_FALLING, "max3100", s) < 0) {
- dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq);
- s->irq = 0;
+ ret = request_irq(port->irq, max3100_irq, IRQF_TRIGGER_FALLING, "max3100", s);
+ if (ret < 0) {
+ dev_warn(&s->spi->dev, "cannot allocate irq %d\n", port->irq);
+ port->irq = 0;
destroy_workqueue(s->workqueue);
s->workqueue = NULL;
return -EBUSY;
}
- if (s->loopback) {
- u16 tx, rx;
- tx = 0x4001;
- max3100_sr(s, tx, &rx);
- }
-
- if (s->max3100_hw_suspend)
- s->max3100_hw_suspend(0);
s->conf_commit = 1;
max3100_dowork(s);
/* wait for clock to settle */
@@ -627,9 +593,7 @@ static int max3100_startup(struct uart_port *port)
static const char *max3100_type(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
dev_dbg(&s->spi->dev, "%s\n", __func__);
@@ -638,18 +602,14 @@ static const char *max3100_type(struct uart_port *port)
static void max3100_release_port(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
dev_dbg(&s->spi->dev, "%s\n", __func__);
}
static void max3100_config_port(struct uart_port *port, int flags)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
dev_dbg(&s->spi->dev, "%s\n", __func__);
@@ -660,9 +620,7 @@ static void max3100_config_port(struct uart_port *port, int flags)
static int max3100_verify_port(struct uart_port *port,
struct serial_struct *ser)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
int ret = -EINVAL;
dev_dbg(&s->spi->dev, "%s\n", __func__);
@@ -674,18 +632,14 @@ static int max3100_verify_port(struct uart_port *port,
static void max3100_stop_tx(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
dev_dbg(&s->spi->dev, "%s\n", __func__);
}
static int max3100_request_port(struct uart_port *port)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
dev_dbg(&s->spi->dev, "%s\n", __func__);
return 0;
@@ -693,9 +647,7 @@ static int max3100_request_port(struct uart_port *port)
static void max3100_break_ctl(struct uart_port *port, int break_state)
{
- struct max3100_port *s = container_of(port,
- struct max3100_port,
- port);
+ struct max3100_port *s = to_max3100_port(port);
dev_dbg(&s->spi->dev, "%s\n", __func__);
}
@@ -731,74 +683,59 @@ static int uart_driver_registered;
static int max3100_probe(struct spi_device *spi)
{
+ struct device *dev = &spi->dev;
int i, retval;
- struct plat_max3100 *pdata;
- u16 tx, rx;
+ u16 rx;
mutex_lock(&max3100s_lock);
if (!uart_driver_registered) {
- uart_driver_registered = 1;
retval = uart_register_driver(&max3100_uart_driver);
if (retval) {
- printk(KERN_ERR "Couldn't register max3100 uart driver\n");
mutex_unlock(&max3100s_lock);
- return retval;
+ return dev_err_probe(dev, retval, "Couldn't register max3100 uart driver\n");
}
+
+ uart_driver_registered = 1;
}
for (i = 0; i < MAX_MAX3100; i++)
if (!max3100s[i])
break;
if (i == MAX_MAX3100) {
- dev_warn(&spi->dev, "too many MAX3100 chips\n");
mutex_unlock(&max3100s_lock);
- return -ENOMEM;
+ return dev_err_probe(dev, -ENOMEM, "too many MAX3100 chips\n");
}
max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL);
if (!max3100s[i]) {
- dev_warn(&spi->dev,
- "kmalloc for max3100 structure %d failed!\n", i);
mutex_unlock(&max3100s_lock);
return -ENOMEM;
}
max3100s[i]->spi = spi;
- max3100s[i]->irq = spi->irq;
spin_lock_init(&max3100s[i]->conf_lock);
spi_set_drvdata(spi, max3100s[i]);
- pdata = dev_get_platdata(&spi->dev);
- max3100s[i]->crystal = pdata->crystal;
- max3100s[i]->loopback = pdata->loopback;
- max3100s[i]->poll_time = msecs_to_jiffies(pdata->poll_time);
- if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0)
- max3100s[i]->poll_time = 1;
- max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend;
max3100s[i]->minor = i;
timer_setup(&max3100s[i]->timer, max3100_timeout, 0);
dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i);
- max3100s[i]->port.irq = max3100s[i]->irq;
- max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200;
+ max3100s[i]->port.irq = spi->irq;
max3100s[i]->port.fifosize = 16;
max3100s[i]->port.ops = &max3100_ops;
max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
max3100s[i]->port.line = i;
max3100s[i]->port.type = PORT_MAX3100;
max3100s[i]->port.dev = &spi->dev;
+
+ /* Read clock frequency from a property, uart_add_one_port() will fail if it's not set */
+ device_property_read_u32(dev, "clock-frequency", &max3100s[i]->port.uartclk);
+
retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port);
if (retval < 0)
- dev_warn(&spi->dev,
- "uart_add_one_port failed for line %d with error %d\n",
- i, retval);
+ dev_err_probe(dev, retval, "uart_add_one_port failed for line %d\n", i);
/* set shutdown mode to save power. Will be woken-up on open */
- if (max3100s[i]->max3100_hw_suspend)
- max3100s[i]->max3100_hw_suspend(1);
- else {
- tx = MAX3100_WC | MAX3100_SHDN;
- max3100_sr(max3100s[i], tx, &rx);
- }
+ max3100_sr(max3100s[i], MAX3100_WC | MAX3100_SHDN, &rx);
mutex_unlock(&max3100s_lock);
return 0;
}
@@ -830,32 +767,25 @@ static void max3100_remove(struct spi_device *spi)
}
pr_debug("removing max3100 driver\n");
uart_unregister_driver(&max3100_uart_driver);
+ uart_driver_registered = 0;
mutex_unlock(&max3100s_lock);
}
-#ifdef CONFIG_PM_SLEEP
-
static int max3100_suspend(struct device *dev)
{
struct max3100_port *s = dev_get_drvdata(dev);
+ u16 rx;
dev_dbg(&s->spi->dev, "%s\n", __func__);
- disable_irq(s->irq);
+ disable_irq(s->port.irq);
s->suspending = 1;
uart_suspend_port(&max3100_uart_driver, &s->port);
- if (s->max3100_hw_suspend)
- s->max3100_hw_suspend(1);
- else {
- /* no HW suspend, so do SW one */
- u16 tx, rx;
-
- tx = MAX3100_WC | MAX3100_SHDN;
- max3100_sr(s, tx, &rx);
- }
+ /* no HW suspend, so do SW one */
+ max3100_sr(s, MAX3100_WC | MAX3100_SHDN, &rx);
return 0;
}
@@ -865,12 +795,10 @@ static int max3100_resume(struct device *dev)
dev_dbg(&s->spi->dev, "%s\n", __func__);
- if (s->max3100_hw_suspend)
- s->max3100_hw_suspend(0);
uart_resume_port(&max3100_uart_driver, &s->port);
s->suspending = 0;
- enable_irq(s->irq);
+ enable_irq(s->port.irq);
s->conf_commit = 1;
if (s->workqueue)
@@ -879,20 +807,29 @@ static int max3100_resume(struct device *dev)
return 0;
}
-static SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume);
-#define MAX3100_PM_OPS (&max3100_pm_ops)
+static DEFINE_SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume);
+
+static const struct spi_device_id max3100_spi_id[] = {
+ { "max3100" },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, max3100_spi_id);
-#else
-#define MAX3100_PM_OPS NULL
-#endif
+static const struct of_device_id max3100_of_match[] = {
+ { .compatible = "maxim,max3100" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, max3100_of_match);
static struct spi_driver max3100_driver = {
.driver = {
.name = "max3100",
- .pm = MAX3100_PM_OPS,
+ .of_match_table = max3100_of_match,
+ .pm = pm_sleep_ptr(&max3100_pm_ops),
},
.probe = max3100_probe,
.remove = max3100_remove,
+ .id_table = max3100_spi_id,
};
module_spi_driver(max3100_driver);
@@ -900,4 +837,3 @@ module_spi_driver(max3100_driver);
MODULE_DESCRIPTION("MAX3100 driver");
MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>");
MODULE_LICENSE("GPL");
-MODULE_ALIAS("spi:max3100");
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index 14dd9cfaa9f7..35369a2f77b2 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -747,8 +747,9 @@ static void max310x_handle_rx(struct uart_port *port, unsigned int rxlen)
static void max310x_handle_tx(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
- unsigned int txlen, to_send, until_end;
+ struct tty_port *tport = &port->state->port;
+ unsigned int txlen, to_send;
+ unsigned char *tail;
if (unlikely(port->x_char)) {
max310x_port_write(port, MAX310X_THR_REG, port->x_char);
@@ -757,32 +758,26 @@ static void max310x_handle_tx(struct uart_port *port)
return;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port))
return;
- /* Get length of data pending in circular buffer */
- to_send = uart_circ_chars_pending(xmit);
- until_end = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
- if (likely(to_send)) {
+ /*
+ * It's a circ buffer -- wrap around.
+ * We could do that in one SPI transaction, but meh.
+ */
+ while (!kfifo_is_empty(&tport->xmit_fifo)) {
/* Limit to space available in TX FIFO */
txlen = max310x_port_read(port, MAX310X_TXFIFOLVL_REG);
txlen = port->fifosize - txlen;
- to_send = (to_send > txlen) ? txlen : to_send;
-
- if (until_end < to_send) {
- /*
- * It's a circ buffer -- wrap around.
- * We could do that in one SPI transaction, but meh.
- */
- max310x_batch_write(port, xmit->buf + xmit->tail, until_end);
- max310x_batch_write(port, xmit->buf, to_send - until_end);
- } else {
- max310x_batch_write(port, xmit->buf + xmit->tail, to_send);
- }
+ if (!txlen)
+ break;
+
+ to_send = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail, txlen);
+ max310x_batch_write(port, tail, to_send);
uart_xmit_advance(port, to_send);
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
@@ -1478,7 +1473,7 @@ static struct regmap_config regcfg = {
.reg_bits = 8,
.val_bits = 8,
.write_flag_mask = MAX310X_WRITE_BIT,
- .cache_type = REGCACHE_RBTREE,
+ .cache_type = REGCACHE_MAPLE,
.max_register = MAX310X_REG_1F,
.writeable_reg = max310x_reg_writeable,
.volatile_reg = max310x_reg_volatile,
@@ -1582,7 +1577,7 @@ static int max310x_i2c_extended_reg_enable(struct device *dev, bool enable)
static struct regmap_config regcfg_i2c = {
.reg_bits = 8,
.val_bits = 8,
- .cache_type = REGCACHE_RBTREE,
+ .cache_type = REGCACHE_MAPLE,
.writeable_reg = max310x_reg_writeable,
.volatile_reg = max310x_reg_volatile,
.precious_reg = max310x_reg_precious,
diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
index 8048fa542fc4..4bff422bb1bc 100644
--- a/drivers/tty/serial/men_z135_uart.c
+++ b/drivers/tty/serial/men_z135_uart.c
@@ -293,17 +293,14 @@ static void men_z135_handle_rx(struct men_z135_port *uart)
static void men_z135_handle_tx(struct men_z135_port *uart)
{
struct uart_port *port = &uart->port;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
+ unsigned char *tail;
+ unsigned int n, txfree;
u32 txc;
u32 wptr;
int qlen;
- int n;
- int txfree;
- int head;
- int tail;
- int s;
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
goto out;
if (uart_tx_stopped(port))
@@ -313,7 +310,7 @@ static void men_z135_handle_tx(struct men_z135_port *uart)
goto out;
/* calculate bytes to copy */
- qlen = uart_circ_chars_pending(xmit);
+ qlen = kfifo_len(&tport->xmit_fifo);
if (qlen <= 0)
goto out;
@@ -345,21 +342,18 @@ static void men_z135_handle_tx(struct men_z135_port *uart)
if (n <= 0)
goto irq_en;
- head = xmit->head & (UART_XMIT_SIZE - 1);
- tail = xmit->tail & (UART_XMIT_SIZE - 1);
-
- s = ((head >= tail) ? head : UART_XMIT_SIZE) - tail;
- n = min(n, s);
+ n = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail,
+ min_t(unsigned int, UART_XMIT_SIZE, n));
+ memcpy_toio(port->membase + MEN_Z135_TX_RAM, tail, n);
- memcpy_toio(port->membase + MEN_Z135_TX_RAM, &xmit->buf[xmit->tail], n);
iowrite32(n & 0x3ff, port->membase + MEN_Z135_TX_CTRL);
uart_xmit_advance(port, n);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
irq_en:
- if (!uart_circ_empty(xmit))
+ if (!kfifo_is_empty(&tport->xmit_fifo))
men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
else
men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index 6feac459c0cf..8eb586ac3b0d 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -141,8 +141,8 @@ static void meson_uart_shutdown(struct uart_port *port)
static void meson_uart_start_tx(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
- unsigned int ch;
+ struct tty_port *tport = &port->state->port;
+ unsigned char ch;
u32 val;
if (uart_tx_stopped(port)) {
@@ -158,21 +158,19 @@ static void meson_uart_start_tx(struct uart_port *port)
continue;
}
- if (uart_circ_empty(xmit))
+ if (!uart_fifo_get(port, &ch))
break;
- ch = xmit->buf[xmit->tail];
writel(ch, port->membase + AML_UART_WFIFO);
- uart_xmit_advance(port, 1);
}
- if (!uart_circ_empty(xmit)) {
+ if (!kfifo_is_empty(&tport->xmit_fifo)) {
val = readl(port->membase + AML_UART_CONTROL);
val |= AML_UART_TX_INT_EN;
writel(val, port->membase + AML_UART_CONTROL);
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
diff --git a/drivers/tty/serial/milbeaut_usio.c b/drivers/tty/serial/milbeaut_usio.c
index da4c6f7e2a30..fb082ee73d5b 100644
--- a/drivers/tty/serial/milbeaut_usio.c
+++ b/drivers/tty/serial/milbeaut_usio.c
@@ -72,7 +72,7 @@ static void mlb_usio_stop_tx(struct uart_port *port)
static void mlb_usio_tx_chars(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
int count;
writew(readw(port->membase + MLB_USIO_REG_FCR) & ~MLB_USIO_FCR_FTIE,
@@ -87,7 +87,7 @@ static void mlb_usio_tx_chars(struct uart_port *port)
port->x_char = 0;
return;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
mlb_usio_stop_tx(port);
return;
}
@@ -96,12 +96,13 @@ static void mlb_usio_tx_chars(struct uart_port *port)
(readw(port->membase + MLB_USIO_REG_FBYTE) & 0xff);
do {
- writew(xmit->buf[xmit->tail], port->membase + MLB_USIO_REG_DR);
+ unsigned char ch;
- uart_xmit_advance(port, 1);
- if (uart_circ_empty(xmit))
+ if (!uart_fifo_get(port, &ch))
break;
+ writew(ch, port->membase + MLB_USIO_REG_DR);
+ port->icount.tx++;
} while (--count > 0);
writew(readw(port->membase + MLB_USIO_REG_FCR) & ~MLB_USIO_FCR_FDRQ,
@@ -110,10 +111,10 @@ static void mlb_usio_tx_chars(struct uart_port *port)
writeb(readb(port->membase + MLB_USIO_REG_SCR) | MLB_USIO_SCR_TBIE,
port->membase + MLB_USIO_REG_SCR);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
mlb_usio_stop_tx(port);
}
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index d27c4c8c84e1..0a9c5219df88 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -161,11 +161,16 @@ enum {
struct msm_dma {
struct dma_chan *chan;
enum dma_data_direction dir;
- dma_addr_t phys;
- unsigned char *virt;
+ union {
+ struct {
+ dma_addr_t phys;
+ unsigned char *virt;
+ unsigned int count;
+ } rx;
+ struct scatterlist tx_sg;
+ };
dma_cookie_t cookie;
u32 enable_bit;
- unsigned int count;
struct dma_async_tx_descriptor *desc;
};
@@ -249,8 +254,12 @@ static void msm_stop_dma(struct uart_port *port, struct msm_dma *dma)
unsigned int mapped;
u32 val;
- mapped = dma->count;
- dma->count = 0;
+ if (dma->dir == DMA_TO_DEVICE) {
+ mapped = sg_dma_len(&dma->tx_sg);
+ } else {
+ mapped = dma->rx.count;
+ dma->rx.count = 0;
+ }
dmaengine_terminate_all(dma->chan);
@@ -265,8 +274,13 @@ static void msm_stop_dma(struct uart_port *port, struct msm_dma *dma)
val &= ~dma->enable_bit;
msm_write(port, val, UARTDM_DMEN);
- if (mapped)
- dma_unmap_single(dev, dma->phys, mapped, dma->dir);
+ if (mapped) {
+ if (dma->dir == DMA_TO_DEVICE) {
+ dma_unmap_sg(dev, &dma->tx_sg, 1, dma->dir);
+ sg_init_table(&dma->tx_sg, 1);
+ } else
+ dma_unmap_single(dev, dma->rx.phys, mapped, dma->dir);
+ }
}
static void msm_release_dma(struct msm_port *msm_port)
@@ -285,7 +299,7 @@ static void msm_release_dma(struct msm_port *msm_port)
if (dma->chan) {
msm_stop_dma(&msm_port->uart, dma);
dma_release_channel(dma->chan);
- kfree(dma->virt);
+ kfree(dma->rx.virt);
}
memset(dma, 0, sizeof(*dma));
@@ -357,8 +371,8 @@ static void msm_request_rx_dma(struct msm_port *msm_port, resource_size_t base)
of_property_read_u32(dev->of_node, "qcom,rx-crci", &crci);
- dma->virt = kzalloc(UARTDM_RX_SIZE, GFP_KERNEL);
- if (!dma->virt)
+ dma->rx.virt = kzalloc(UARTDM_RX_SIZE, GFP_KERNEL);
+ if (!dma->rx.virt)
goto rel_rx;
memset(&conf, 0, sizeof(conf));
@@ -385,7 +399,7 @@ static void msm_request_rx_dma(struct msm_port *msm_port, resource_size_t base)
return;
err:
- kfree(dma->virt);
+ kfree(dma->rx.virt);
rel_rx:
dma_release_channel(dma->chan);
no_rx:
@@ -420,7 +434,7 @@ static void msm_start_tx(struct uart_port *port)
struct msm_dma *dma = &msm_port->tx_dma;
/* Already started in DMA mode */
- if (dma->count)
+ if (sg_dma_len(&dma->tx_sg))
return;
msm_port->imr |= MSM_UART_IMR_TXLEV;
@@ -438,7 +452,7 @@ static void msm_complete_tx_dma(void *args)
{
struct msm_port *msm_port = args;
struct uart_port *port = &msm_port->uart;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
struct msm_dma *dma = &msm_port->tx_dma;
struct dma_tx_state state;
unsigned long flags;
@@ -448,12 +462,12 @@ static void msm_complete_tx_dma(void *args)
uart_port_lock_irqsave(port, &flags);
/* Already stopped */
- if (!dma->count)
+ if (!sg_dma_len(&dma->tx_sg))
goto done;
dmaengine_tx_status(dma->chan, dma->cookie, &state);
- dma_unmap_single(port->dev, dma->phys, dma->count, dma->dir);
+ dma_unmap_sg(port->dev, &dma->tx_sg, 1, dma->dir);
val = msm_read(port, UARTDM_DMEN);
val &= ~dma->enable_bit;
@@ -464,15 +478,15 @@ static void msm_complete_tx_dma(void *args)
msm_write(port, MSM_UART_CR_TX_ENABLE, MSM_UART_CR);
}
- count = dma->count - state.residue;
+ count = sg_dma_len(&dma->tx_sg) - state.residue;
uart_xmit_advance(port, count);
- dma->count = 0;
+ sg_init_table(&dma->tx_sg, 1);
/* Restore "Tx FIFO below watermark" interrupt */
msm_port->imr |= MSM_UART_IMR_TXLEV;
msm_write(port, msm_port->imr, MSM_UART_IMR);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
msm_handle_tx(port);
@@ -482,22 +496,24 @@ done:
static int msm_handle_tx_dma(struct msm_port *msm_port, unsigned int count)
{
- struct circ_buf *xmit = &msm_port->uart.state->xmit;
struct uart_port *port = &msm_port->uart;
+ struct tty_port *tport = &port->state->port;
struct msm_dma *dma = &msm_port->tx_dma;
- void *cpu_addr;
+ unsigned int mapped;
int ret;
u32 val;
- cpu_addr = &xmit->buf[xmit->tail];
+ sg_init_table(&dma->tx_sg, 1);
+ kfifo_dma_out_prepare(&tport->xmit_fifo, &dma->tx_sg, 1, count);
- dma->phys = dma_map_single(port->dev, cpu_addr, count, dma->dir);
- ret = dma_mapping_error(port->dev, dma->phys);
- if (ret)
- return ret;
+ mapped = dma_map_sg(port->dev, &dma->tx_sg, 1, dma->dir);
+ if (!mapped) {
+ ret = -EIO;
+ goto zero_sg;
+ }
- dma->desc = dmaengine_prep_slave_single(dma->chan, dma->phys,
- count, DMA_MEM_TO_DEV,
+ dma->desc = dmaengine_prep_slave_sg(dma->chan, &dma->tx_sg, 1,
+ DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT |
DMA_PREP_FENCE);
if (!dma->desc) {
@@ -520,8 +536,6 @@ static int msm_handle_tx_dma(struct msm_port *msm_port, unsigned int count)
msm_port->imr &= ~MSM_UART_IMR_TXLEV;
msm_write(port, msm_port->imr, MSM_UART_IMR);
- dma->count = count;
-
val = msm_read(port, UARTDM_DMEN);
val |= dma->enable_bit;
@@ -536,7 +550,9 @@ static int msm_handle_tx_dma(struct msm_port *msm_port, unsigned int count)
dma_async_issue_pending(dma->chan);
return 0;
unmap:
- dma_unmap_single(port->dev, dma->phys, count, dma->dir);
+ dma_unmap_sg(port->dev, &dma->tx_sg, 1, dma->dir);
+zero_sg:
+ sg_init_table(&dma->tx_sg, 1);
return ret;
}
@@ -553,7 +569,7 @@ static void msm_complete_rx_dma(void *args)
uart_port_lock_irqsave(port, &flags);
/* Already stopped */
- if (!dma->count)
+ if (!dma->rx.count)
goto done;
val = msm_read(port, UARTDM_DMEN);
@@ -570,14 +586,14 @@ static void msm_complete_rx_dma(void *args)
port->icount.rx += count;
- dma->count = 0;
+ dma->rx.count = 0;
- dma_unmap_single(port->dev, dma->phys, UARTDM_RX_SIZE, dma->dir);
+ dma_unmap_single(port->dev, dma->rx.phys, UARTDM_RX_SIZE, dma->dir);
for (i = 0; i < count; i++) {
char flag = TTY_NORMAL;
- if (msm_port->break_detected && dma->virt[i] == 0) {
+ if (msm_port->break_detected && dma->rx.virt[i] == 0) {
port->icount.brk++;
flag = TTY_BREAK;
msm_port->break_detected = false;
@@ -588,9 +604,9 @@ static void msm_complete_rx_dma(void *args)
if (!(port->read_status_mask & MSM_UART_SR_RX_BREAK))
flag = TTY_NORMAL;
- sysrq = uart_prepare_sysrq_char(port, dma->virt[i]);
+ sysrq = uart_prepare_sysrq_char(port, dma->rx.virt[i]);
if (!sysrq)
- tty_insert_flip_char(tport, dma->virt[i], flag);
+ tty_insert_flip_char(tport, dma->rx.virt[i], flag);
}
msm_start_rx_dma(msm_port);
@@ -614,13 +630,13 @@ static void msm_start_rx_dma(struct msm_port *msm_port)
if (!dma->chan)
return;
- dma->phys = dma_map_single(uart->dev, dma->virt,
+ dma->rx.phys = dma_map_single(uart->dev, dma->rx.virt,
UARTDM_RX_SIZE, dma->dir);
- ret = dma_mapping_error(uart->dev, dma->phys);
+ ret = dma_mapping_error(uart->dev, dma->rx.phys);
if (ret)
goto sw_mode;
- dma->desc = dmaengine_prep_slave_single(dma->chan, dma->phys,
+ dma->desc = dmaengine_prep_slave_single(dma->chan, dma->rx.phys,
UARTDM_RX_SIZE, DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT);
if (!dma->desc)
@@ -648,7 +664,7 @@ static void msm_start_rx_dma(struct msm_port *msm_port)
msm_write(uart, msm_port->imr, MSM_UART_IMR);
- dma->count = UARTDM_RX_SIZE;
+ dma->rx.count = UARTDM_RX_SIZE;
dma_async_issue_pending(dma->chan);
@@ -668,7 +684,7 @@ static void msm_start_rx_dma(struct msm_port *msm_port)
return;
unmap:
- dma_unmap_single(uart->dev, dma->phys, UARTDM_RX_SIZE, dma->dir);
+ dma_unmap_single(uart->dev, dma->rx.phys, UARTDM_RX_SIZE, dma->dir);
sw_mode:
/*
@@ -831,8 +847,8 @@ static void msm_handle_rx(struct uart_port *port)
static void msm_handle_tx_pio(struct uart_port *port, unsigned int tx_count)
{
- struct circ_buf *xmit = &port->state->xmit;
struct msm_port *msm_port = to_msm_port(port);
+ struct tty_port *tport = &port->state->port;
unsigned int num_chars;
unsigned int tf_pointer = 0;
void __iomem *tf;
@@ -846,8 +862,7 @@ static void msm_handle_tx_pio(struct uart_port *port, unsigned int tx_count)
msm_reset_dm_count(port, tx_count);
while (tf_pointer < tx_count) {
- int i;
- char buf[4] = { 0 };
+ unsigned char buf[4] = { 0 };
if (!(msm_read(port, MSM_UART_SR) & MSM_UART_SR_TX_READY))
break;
@@ -858,26 +873,23 @@ static void msm_handle_tx_pio(struct uart_port *port, unsigned int tx_count)
else
num_chars = 1;
- for (i = 0; i < num_chars; i++)
- buf[i] = xmit->buf[xmit->tail + i];
-
+ num_chars = uart_fifo_out(port, buf, num_chars);
iowrite32_rep(tf, buf, 1);
- uart_xmit_advance(port, num_chars);
tf_pointer += num_chars;
}
/* disable tx interrupts if nothing more to send */
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
msm_stop_tx(port);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
static void msm_handle_tx(struct uart_port *port)
{
struct msm_port *msm_port = to_msm_port(port);
- struct circ_buf *xmit = &msm_port->uart.state->xmit;
+ struct tty_port *tport = &port->state->port;
struct msm_dma *dma = &msm_port->tx_dma;
unsigned int pio_count, dma_count, dma_min;
char buf[4] = { 0 };
@@ -901,13 +913,13 @@ static void msm_handle_tx(struct uart_port *port)
return;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
msm_stop_tx(port);
return;
}
- pio_count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
- dma_count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ dma_count = pio_count = kfifo_out_linear(&tport->xmit_fifo, NULL,
+ UART_XMIT_SIZE);
dma_min = 1; /* Always DMA */
if (msm_port->is_uartdm > UARTDM_1P3) {
@@ -955,7 +967,7 @@ static irqreturn_t msm_uart_irq(int irq, void *dev_id)
}
if (misr & (MSM_UART_IMR_RXLEV | MSM_UART_IMR_RXSTALE)) {
- if (dma->count) {
+ if (dma->rx.count) {
val = MSM_UART_CR_CMD_STALE_EVENT_DISABLE;
msm_write(port, val, MSM_UART_CR);
val = MSM_UART_CR_CMD_RESET_STALE_INT;
diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
index 0255646bc175..5de57b77abdb 100644
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -219,12 +219,10 @@ static void mvebu_uart_stop_tx(struct uart_port *port)
static void mvebu_uart_start_tx(struct uart_port *port)
{
unsigned int ctl;
- struct circ_buf *xmit = &port->state->xmit;
+ unsigned char c;
- if (IS_EXTENDED(port) && !uart_circ_empty(xmit)) {
- writel(xmit->buf[xmit->tail], port->membase + UART_TSH(port));
- uart_xmit_advance(port, 1);
- }
+ if (IS_EXTENDED(port) && uart_fifo_get(port, &c))
+ writel(c, port->membase + UART_TSH(port));
ctl = readl(port->membase + UART_INTR(port));
ctl |= CTRL_TX_RDY_INT(port);
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 1e8853eae504..a1c76565c399 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -517,7 +517,7 @@ static void mxs_auart_tx_chars(struct mxs_auart_port *s);
static void dma_tx_callback(void *param)
{
struct mxs_auart_port *s = param;
- struct circ_buf *xmit = &s->port.state->xmit;
+ struct tty_port *tport = &s->port.state->port;
dma_unmap_sg(s->dev, &s->tx_sgl, 1, DMA_TO_DEVICE);
@@ -526,7 +526,7 @@ static void dma_tx_callback(void *param)
smp_mb__after_atomic();
/* wake up the possible processes. */
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&s->port);
mxs_auart_tx_chars(s);
@@ -568,33 +568,22 @@ static int mxs_auart_dma_tx(struct mxs_auart_port *s, int size)
static void mxs_auart_tx_chars(struct mxs_auart_port *s)
{
- struct circ_buf *xmit = &s->port.state->xmit;
+ struct tty_port *tport = &s->port.state->port;
bool pending;
u8 ch;
if (auart_dma_enabled(s)) {
u32 i = 0;
- int size;
void *buffer = s->tx_dma_buf;
if (test_and_set_bit(MXS_AUART_DMA_TX_SYNC, &s->flags))
return;
- while (!uart_circ_empty(xmit) && !uart_tx_stopped(&s->port)) {
- size = min_t(u32, UART_XMIT_SIZE - i,
- CIRC_CNT_TO_END(xmit->head,
- xmit->tail,
- UART_XMIT_SIZE));
- memcpy(buffer + i, xmit->buf + xmit->tail, size);
- xmit->tail = (xmit->tail + size) & (UART_XMIT_SIZE - 1);
-
- i += size;
- if (i >= UART_XMIT_SIZE)
- break;
- }
-
if (uart_tx_stopped(&s->port))
mxs_auart_stop_tx(&s->port);
+ else
+ i = kfifo_out(&tport->xmit_fifo, buffer,
+ UART_XMIT_SIZE);
if (i) {
mxs_auart_dma_tx(s, i);
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 9be1c871cf11..d7e172eeaab1 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1093,7 +1093,6 @@ static void __maybe_unused wait_for_xmitr(struct uart_omap_port *up)
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
- tmout = 1000000;
for (tmout = 1000000; tmout; tmout--) {
unsigned int msr = serial_in(up, UART_MSR);
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 89257cddf540..c7cee5fee603 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -808,7 +808,7 @@ static int dma_handle_rx(struct eg20t_port *priv)
static unsigned int handle_tx(struct eg20t_port *priv)
{
struct uart_port *port = &priv->port;
- struct circ_buf *xmit = &port->state->xmit;
+ unsigned char ch;
int fifo_size;
int tx_empty;
@@ -830,9 +830,9 @@ static unsigned int handle_tx(struct eg20t_port *priv)
fifo_size--;
}
- while (!uart_tx_stopped(port) && !uart_circ_empty(xmit) && fifo_size) {
- iowrite8(xmit->buf[xmit->tail], priv->membase + PCH_UART_THR);
- uart_xmit_advance(port, 1);
+ while (!uart_tx_stopped(port) && fifo_size &&
+ uart_fifo_get(port, &ch)) {
+ iowrite8(ch, priv->membase + PCH_UART_THR);
fifo_size--;
tx_empty = 0;
}
@@ -850,14 +850,14 @@ static unsigned int handle_tx(struct eg20t_port *priv)
static unsigned int dma_handle_tx(struct eg20t_port *priv)
{
struct uart_port *port = &priv->port;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
struct scatterlist *sg;
int nent;
int fifo_size;
struct dma_async_tx_descriptor *desc;
+ unsigned int bytes, tail;
int num;
int i;
- int bytes;
int size;
int rem;
@@ -886,7 +886,7 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
fifo_size--;
}
- bytes = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ bytes = kfifo_out_linear(&tport->xmit_fifo, &tail, UART_XMIT_SIZE);
if (!bytes) {
dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
@@ -920,10 +920,10 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
for (i = 0; i < num; i++, sg++) {
if (i == (num - 1))
- sg_set_page(sg, virt_to_page(xmit->buf),
+ sg_set_page(sg, virt_to_page(tport->xmit_buf),
rem, fifo_size * i);
else
- sg_set_page(sg, virt_to_page(xmit->buf),
+ sg_set_page(sg, virt_to_page(tport->xmit_buf),
size, fifo_size * i);
}
@@ -937,8 +937,7 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
priv->nent = nent;
for (i = 0; i < nent; i++, sg++) {
- sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
- fifo_size * i;
+ sg->offset = tail + fifo_size * i;
sg_dma_address(sg) = (sg_dma_address(sg) &
~(UART_XMIT_SIZE - 1)) + sg->offset;
if (i == (nent - 1))
diff --git a/drivers/tty/serial/pic32_uart.c b/drivers/tty/serial/pic32_uart.c
index bbb46e6e98a2..261c8115a700 100644
--- a/drivers/tty/serial/pic32_uart.c
+++ b/drivers/tty/serial/pic32_uart.c
@@ -8,11 +8,11 @@
* Sorin-Andrei Pistirica <andrei.pistirica@microchip.com>
*/
+#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_irq.h>
-#include <linux/of_gpio.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
@@ -342,7 +342,7 @@ static void pic32_uart_do_rx(struct uart_port *port)
static void pic32_uart_do_tx(struct uart_port *port)
{
struct pic32_sport *sport = to_pic32_sport(port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
unsigned int max_count = PIC32_UART_TX_FIFO_DEPTH;
if (port->x_char) {
@@ -357,7 +357,7 @@ static void pic32_uart_do_tx(struct uart_port *port)
return;
}
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
goto txq_empty;
/* keep stuffing chars into uart tx buffer
@@ -371,21 +371,20 @@ static void pic32_uart_do_tx(struct uart_port *port)
*/
while (!(PIC32_UART_STA_UTXBF &
pic32_uart_readl(sport, PIC32_UART_STA))) {
- unsigned int c = xmit->buf[xmit->tail];
+ unsigned char c;
+ if (!uart_fifo_get(port, &c))
+ break;
pic32_uart_writel(sport, PIC32_UART_TX, c);
- uart_xmit_advance(port, 1);
- if (uart_circ_empty(xmit))
- break;
if (--max_count == 0)
break;
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
goto txq_empty;
return;
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 92195f984de1..8969b11cc0a9 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -333,7 +333,8 @@ static void pmz_status_handle(struct uart_pmac_port *uap)
static void pmz_transmit_chars(struct uart_pmac_port *uap)
{
- struct circ_buf *xmit;
+ struct tty_port *tport;
+ unsigned char ch;
if (ZS_IS_CONS(uap)) {
unsigned char status = read_zsreg(uap, R0);
@@ -384,8 +385,8 @@ static void pmz_transmit_chars(struct uart_pmac_port *uap)
if (uap->port.state == NULL)
goto ack_tx_int;
- xmit = &uap->port.state->xmit;
- if (uart_circ_empty(xmit)) {
+ tport = &uap->port.state->port;
+ if (kfifo_is_empty(&tport->xmit_fifo)) {
uart_write_wakeup(&uap->port);
goto ack_tx_int;
}
@@ -393,12 +394,11 @@ static void pmz_transmit_chars(struct uart_pmac_port *uap)
goto ack_tx_int;
uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
- write_zsdata(uap, xmit->buf[xmit->tail]);
+ WARN_ON(!uart_fifo_get(&uap->port, &ch));
+ write_zsdata(uap, ch);
zssync(uap);
- uart_xmit_advance(&uap->port, 1);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&uap->port);
return;
@@ -606,15 +606,15 @@ static void pmz_start_tx(struct uart_port *port)
port->icount.tx++;
port->x_char = 0;
} else {
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
+ unsigned char ch;
- if (uart_circ_empty(xmit))
+ if (!uart_fifo_get(&uap->port, &ch))
return;
- write_zsdata(uap, xmit->buf[xmit->tail]);
+ write_zsdata(uap, ch);
zssync(uap);
- uart_xmit_advance(port, 1);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&uap->port);
}
}
@@ -1681,7 +1681,7 @@ static void pmz_dispose_port(struct uart_pmac_port *uap)
memset(uap, 0, sizeof(struct uart_pmac_port));
}
-static int __init pmz_attach(struct platform_device *pdev)
+static int pmz_attach(struct platform_device *pdev)
{
struct uart_pmac_port *uap;
int i;
@@ -1700,7 +1700,7 @@ static int __init pmz_attach(struct platform_device *pdev)
return uart_add_one_port(&pmz_uart_reg, &uap->port);
}
-static void __exit pmz_detach(struct platform_device *pdev)
+static void pmz_detach(struct platform_device *pdev)
{
struct uart_pmac_port *uap = platform_get_drvdata(pdev);
@@ -1775,7 +1775,8 @@ static struct macio_driver pmz_driver = {
#else
static struct platform_driver pmz_driver = {
- .remove_new = __exit_p(pmz_detach),
+ .probe = pmz_attach,
+ .remove_new = pmz_detach,
.driver = {
.name = "scc",
},
@@ -1823,7 +1824,7 @@ static int __init init_pmz(void)
#ifdef CONFIG_PPC_PMAC
return macio_register_driver(&pmz_driver);
#else
- return platform_driver_probe(&pmz_driver, pmz_attach);
+ return platform_driver_register(&pmz_driver);
#endif
}
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index f9f7ac1a10df..2bd25afe0d92 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -505,7 +505,7 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s,
*/
qcom_geni_serial_poll_tx_done(uport);
- if (!uart_circ_empty(&uport->state->xmit)) {
+ if (!kfifo_is_empty(&uport->state->port.xmit_fifo)) {
irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
writel(irq_en | M_TX_FIFO_WATERMARK_EN,
uport->membase + SE_GENI_M_IRQ_EN);
@@ -620,22 +620,24 @@ static void qcom_geni_serial_stop_tx_dma(struct uart_port *uport)
static void qcom_geni_serial_start_tx_dma(struct uart_port *uport)
{
struct qcom_geni_serial_port *port = to_dev_port(uport);
- struct circ_buf *xmit = &uport->state->xmit;
+ struct tty_port *tport = &uport->state->port;
unsigned int xmit_size;
+ u8 *tail;
int ret;
if (port->tx_dma_addr)
return;
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
return;
- xmit_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ xmit_size = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail,
+ UART_XMIT_SIZE);
qcom_geni_serial_setup_tx(uport, xmit_size);
- ret = geni_se_tx_dma_prep(&port->se, &xmit->buf[xmit->tail],
- xmit_size, &port->tx_dma_addr);
+ ret = geni_se_tx_dma_prep(&port->se, tail, xmit_size,
+ &port->tx_dma_addr);
if (ret) {
dev_err(uport->dev, "unable to start TX SE DMA: %d\n", ret);
qcom_geni_serial_stop_tx_dma(uport);
@@ -853,18 +855,14 @@ static void qcom_geni_serial_send_chunk_fifo(struct uart_port *uport,
unsigned int chunk)
{
struct qcom_geni_serial_port *port = to_dev_port(uport);
- struct circ_buf *xmit = &uport->state->xmit;
- unsigned int tx_bytes, c, remaining = chunk;
+ unsigned int tx_bytes, remaining = chunk;
u8 buf[BYTES_PER_FIFO_WORD];
while (remaining) {
memset(buf, 0, sizeof(buf));
tx_bytes = min(remaining, BYTES_PER_FIFO_WORD);
- for (c = 0; c < tx_bytes ; c++) {
- buf[c] = xmit->buf[xmit->tail];
- uart_xmit_advance(uport, 1);
- }
+ tx_bytes = uart_fifo_out(uport, buf, tx_bytes);
iowrite32_rep(uport->membase + SE_GENI_TX_FIFOn, buf, 1);
@@ -877,7 +875,7 @@ static void qcom_geni_serial_handle_tx_fifo(struct uart_port *uport,
bool done, bool active)
{
struct qcom_geni_serial_port *port = to_dev_port(uport);
- struct circ_buf *xmit = &uport->state->xmit;
+ struct tty_port *tport = &uport->state->port;
size_t avail;
size_t pending;
u32 status;
@@ -890,7 +888,7 @@ static void qcom_geni_serial_handle_tx_fifo(struct uart_port *uport,
if (active)
pending = port->tx_remaining;
else
- pending = uart_circ_chars_pending(xmit);
+ pending = kfifo_len(&tport->xmit_fifo);
/* All data has been transmitted and acknowledged as received */
if (!pending && !status && done) {
@@ -933,24 +931,24 @@ out_write_wakeup:
uport->membase + SE_GENI_M_IRQ_EN);
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(uport);
}
static void qcom_geni_serial_handle_tx_dma(struct uart_port *uport)
{
struct qcom_geni_serial_port *port = to_dev_port(uport);
- struct circ_buf *xmit = &uport->state->xmit;
+ struct tty_port *tport = &uport->state->port;
uart_xmit_advance(uport, port->tx_remaining);
geni_se_tx_dma_unprep(&port->se, port->tx_dma_addr, port->tx_remaining);
port->tx_dma_addr = 0;
port->tx_remaining = 0;
- if (!uart_circ_empty(xmit))
+ if (!kfifo_is_empty(&tport->xmit_fifo))
qcom_geni_serial_start_tx_dma(uport);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(uport);
}
diff --git a/drivers/tty/serial/rda-uart.c b/drivers/tty/serial/rda-uart.c
index 82def9b8632a..663e35e424bd 100644
--- a/drivers/tty/serial/rda-uart.c
+++ b/drivers/tty/serial/rda-uart.c
@@ -330,8 +330,8 @@ static void rda_uart_set_termios(struct uart_port *port,
static void rda_uart_send_chars(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
- unsigned int ch;
+ struct tty_port *tport = &port->state->port;
+ unsigned char ch;
u32 val;
if (uart_tx_stopped(port))
@@ -347,19 +347,14 @@ static void rda_uart_send_chars(struct uart_port *port)
port->x_char = 0;
}
- while (rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK) {
- if (uart_circ_empty(xmit))
- break;
-
- ch = xmit->buf[xmit->tail];
+ while ((rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK) &&
+ uart_fifo_get(port, &ch))
rda_uart_write(port, ch, RDA_UART_RXTX_BUFFER);
- uart_xmit_advance(port, 1);
- }
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (!uart_circ_empty(xmit)) {
+ if (!kfifo_is_empty(&tport->xmit_fifo)) {
/* Re-enable Tx FIFO interrupt */
val = rda_uart_read(port, RDA_UART_IRQ_MASK);
val |= RDA_UART_TX_DATA_NEEDED;
diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index a2d07e05c502..dc35eb77d2ef 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -329,7 +329,7 @@ static void s3c24xx_serial_tx_dma_complete(void *args)
{
struct s3c24xx_uart_port *ourport = args;
struct uart_port *port = &ourport->port;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
struct s3c24xx_uart_dma *dma = ourport->dma;
struct dma_tx_state state;
unsigned long flags;
@@ -348,7 +348,7 @@ static void s3c24xx_serial_tx_dma_complete(void *args)
uart_xmit_advance(port, count);
ourport->tx_in_progress = 0;
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
s3c24xx_serial_start_next_tx(ourport);
@@ -431,17 +431,15 @@ static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
}
static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
- unsigned int count)
+ unsigned int count, unsigned int tail)
{
- struct uart_port *port = &ourport->port;
- struct circ_buf *xmit = &port->state->xmit;
struct s3c24xx_uart_dma *dma = ourport->dma;
if (ourport->tx_mode != S3C24XX_TX_DMA)
enable_tx_dma(ourport);
dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
- dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
+ dma->tx_transfer_addr = dma->tx_addr + tail;
dma_sync_single_for_device(dma->tx_chan->device->dev,
dma->tx_transfer_addr, dma->tx_size,
@@ -468,11 +466,11 @@ static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
{
struct uart_port *port = &ourport->port;
- struct circ_buf *xmit = &port->state->xmit;
- unsigned long count;
+ struct tty_port *tport = &port->state->port;
+ unsigned int count, tail;
/* Get data size up to the end of buffer */
- count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ count = kfifo_out_linear(&tport->xmit_fifo, &tail, UART_XMIT_SIZE);
if (!count) {
s3c24xx_serial_stop_tx(port);
@@ -481,16 +479,16 @@ static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
if (!ourport->dma || !ourport->dma->tx_chan ||
count < ourport->min_dma_size ||
- xmit->tail & (dma_get_cache_alignment() - 1))
+ tail & (dma_get_cache_alignment() - 1))
s3c24xx_serial_start_tx_pio(ourport);
else
- s3c24xx_serial_start_tx_dma(ourport, count);
+ s3c24xx_serial_start_tx_dma(ourport, count, tail);
}
static void s3c24xx_serial_start_tx(struct uart_port *port)
{
struct s3c24xx_uart_port *ourport = to_ourport(port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
if (!ourport->tx_enabled) {
if (port->flags & UPF_CONS_FLOW)
@@ -502,7 +500,8 @@ static void s3c24xx_serial_start_tx(struct uart_port *port)
}
if (ourport->dma && ourport->dma->tx_chan) {
- if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
+ if (!kfifo_is_empty(&tport->xmit_fifo) &&
+ !ourport->tx_in_progress)
s3c24xx_serial_start_next_tx(ourport);
}
}
@@ -868,18 +867,19 @@ static irqreturn_t s3c24xx_serial_rx_irq(int irq, void *dev_id)
static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport)
{
struct uart_port *port = &ourport->port;
- struct circ_buf *xmit = &port->state->xmit;
- int count, dma_count = 0;
+ struct tty_port *tport = &port->state->port;
+ unsigned int count, dma_count = 0, tail;
- count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ count = kfifo_out_linear(&tport->xmit_fifo, &tail, UART_XMIT_SIZE);
if (ourport->dma && ourport->dma->tx_chan &&
count >= ourport->min_dma_size) {
int align = dma_get_cache_alignment() -
- (xmit->tail & (dma_get_cache_alignment() - 1));
+ (tail & (dma_get_cache_alignment() - 1));
if (count - align >= ourport->min_dma_size) {
dma_count = count - align;
count = align;
+ tail += align;
}
}
@@ -894,7 +894,7 @@ static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport)
* stopped, disable the uart and exit
*/
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
s3c24xx_serial_stop_tx(port);
return;
}
@@ -906,24 +906,25 @@ static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport)
dma_count = 0;
}
- while (!uart_circ_empty(xmit) && count > 0) {
- if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
+ while (!(rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)) {
+ unsigned char ch;
+
+ if (!uart_fifo_get(port, &ch))
break;
- wr_reg(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
- uart_xmit_advance(port, 1);
+ wr_reg(port, S3C2410_UTXH, ch);
count--;
}
if (!count && dma_count) {
- s3c24xx_serial_start_tx_dma(ourport, dma_count);
+ s3c24xx_serial_start_tx_dma(ourport, dma_count, tail);
return;
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
s3c24xx_serial_stop_tx(port);
}
@@ -1118,7 +1119,8 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
/* TX buffer */
dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
- p->port.state->xmit.buf, UART_XMIT_SIZE,
+ p->port.state->port.xmit_buf,
+ UART_XMIT_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(dma->tx_chan->device->dev, dma->tx_addr)) {
reason = "DMA mapping error for TX buffer";
diff --git a/drivers/tty/serial/sb1250-duart.c b/drivers/tty/serial/sb1250-duart.c
index dbec29d9a6c3..b4e1b90e5960 100644
--- a/drivers/tty/serial/sb1250-duart.c
+++ b/drivers/tty/serial/sb1250-duart.c
@@ -382,7 +382,8 @@ static void sbd_receive_chars(struct sbd_port *sport)
static void sbd_transmit_chars(struct sbd_port *sport)
{
struct uart_port *uport = &sport->port;
- struct circ_buf *xmit = &sport->port.state->xmit;
+ struct tty_port *tport = &sport->port.state->port;
+ unsigned char ch;
unsigned int mask;
int stop_tx;
@@ -395,19 +396,19 @@ static void sbd_transmit_chars(struct sbd_port *sport)
}
/* If nothing to do or stopped or hardware stopped. */
- stop_tx = (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port));
+ stop_tx = uart_tx_stopped(&sport->port) ||
+ !uart_fifo_get(&sport->port, &ch);
/* Send char. */
if (!stop_tx) {
- write_sbdchn(sport, R_DUART_TX_HOLD, xmit->buf[xmit->tail]);
- uart_xmit_advance(&sport->port, 1);
+ write_sbdchn(sport, R_DUART_TX_HOLD, ch);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
}
/* Are we are done? */
- if (stop_tx || uart_circ_empty(xmit)) {
+ if (stop_tx || kfifo_is_empty(&tport->xmit_fifo)) {
/* Disable tx interrupts. */
mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2));
mask &= ~M_DUART_IMR_TX;
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 929206a9a6e1..03cf30e20b75 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1,35 +1,38 @@
// SPDX-License-Identifier: GPL-2.0+
/*
- * SC16IS7xx tty serial driver - Copyright (C) 2014 GridPoint
- * Author: Jon Ringle <jringle@gridpoint.com>
+ * SC16IS7xx tty serial driver - common code
*
- * Based on max310x.c, by Alexander Shiyan <shc_work@mail.ru>
+ * Copyright (C) 2014 GridPoint
+ * Author: Jon Ringle <jringle@gridpoint.com>
+ * Based on max310x.c, by Alexander Shiyan <shc_work@mail.ru>
*/
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#undef DEFAULT_SYMBOL_NAMESPACE
+#define DEFAULT_SYMBOL_NAMESPACE SERIAL_NXP_SC16IS7XX
-#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/export.h>
#include <linux/gpio/driver.h>
-#include <linux/i2c.h>
+#include <linux/idr.h>
+#include <linux/kthread.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regmap.h>
+#include <linux/sched.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
+#include <linux/string.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
-#include <linux/spi/spi.h>
#include <linux/uaccess.h>
#include <linux/units.h>
-#include <uapi/linux/sched/types.h>
-#define SC16IS7XX_NAME "sc16is7xx"
+#include "sc16is7xx.h"
+
#define SC16IS7XX_MAX_DEVS 8
-#define SC16IS7XX_MAX_PORTS 2 /* Maximum number of UART ports per IC. */
/* SC16IS7XX register definitions */
#define SC16IS7XX_RHR_REG (0x00) /* RX FIFO */
@@ -302,16 +305,9 @@
/* Misc definitions */
-#define SC16IS7XX_SPI_READ_BIT BIT(7)
#define SC16IS7XX_FIFO_SIZE (64)
#define SC16IS7XX_GPIOS_PER_BANK 4
-struct sc16is7xx_devtype {
- char name[10];
- int nr_gpio;
- int nr_uart;
-};
-
#define SC16IS7XX_RECONF_MD (1 << 0)
#define SC16IS7XX_RECONF_IER (1 << 1)
#define SC16IS7XX_RECONF_RS485 (1 << 2)
@@ -349,7 +345,7 @@ struct sc16is7xx_port {
struct sc16is7xx_one p[];
};
-static DECLARE_BITMAP(sc16is7xx_lines, SC16IS7XX_MAX_DEVS);
+static DEFINE_IDA(sc16is7xx_lines);
static struct uart_driver sc16is7xx_uart = {
.owner = THIS_MODULE,
@@ -492,35 +488,40 @@ static void sc16is7xx_stop_rx(struct uart_port *port)
sc16is7xx_ier_clear(port, SC16IS7XX_IER_RDI_BIT);
}
-static const struct sc16is7xx_devtype sc16is74x_devtype = {
+const struct sc16is7xx_devtype sc16is74x_devtype = {
.name = "SC16IS74X",
.nr_gpio = 0,
.nr_uart = 1,
};
+EXPORT_SYMBOL_GPL(sc16is74x_devtype);
-static const struct sc16is7xx_devtype sc16is750_devtype = {
+const struct sc16is7xx_devtype sc16is750_devtype = {
.name = "SC16IS750",
.nr_gpio = 8,
.nr_uart = 1,
};
+EXPORT_SYMBOL_GPL(sc16is750_devtype);
-static const struct sc16is7xx_devtype sc16is752_devtype = {
+const struct sc16is7xx_devtype sc16is752_devtype = {
.name = "SC16IS752",
.nr_gpio = 8,
.nr_uart = 2,
};
+EXPORT_SYMBOL_GPL(sc16is752_devtype);
-static const struct sc16is7xx_devtype sc16is760_devtype = {
+const struct sc16is7xx_devtype sc16is760_devtype = {
.name = "SC16IS760",
.nr_gpio = 8,
.nr_uart = 1,
};
+EXPORT_SYMBOL_GPL(sc16is760_devtype);
-static const struct sc16is7xx_devtype sc16is762_devtype = {
+const struct sc16is7xx_devtype sc16is762_devtype = {
.name = "SC16IS762",
.nr_gpio = 8,
.nr_uart = 2,
};
+EXPORT_SYMBOL_GPL(sc16is762_devtype);
static bool sc16is7xx_regmap_volatile(struct device *dev, unsigned int reg)
{
@@ -676,9 +677,9 @@ static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen,
static void sc16is7xx_handle_tx(struct uart_port *port)
{
struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
- struct circ_buf *xmit = &port->state->xmit;
- unsigned int txlen, to_send, i;
+ struct tty_port *tport = &port->state->port;
unsigned long flags;
+ unsigned int txlen;
if (unlikely(port->x_char)) {
sc16is7xx_port_write(port, SC16IS7XX_THR_REG, port->x_char);
@@ -687,40 +688,30 @@ static void sc16is7xx_handle_tx(struct uart_port *port)
return;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
uart_port_lock_irqsave(port, &flags);
sc16is7xx_stop_tx(port);
uart_port_unlock_irqrestore(port, flags);
return;
}
- /* Get length of data pending in circular buffer */
- to_send = uart_circ_chars_pending(xmit);
- if (likely(to_send)) {
- /* Limit to space available in TX FIFO */
- txlen = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG);
- if (txlen > SC16IS7XX_FIFO_SIZE) {
- dev_err_ratelimited(port->dev,
- "chip reports %d free bytes in TX fifo, but it only has %d",
- txlen, SC16IS7XX_FIFO_SIZE);
- txlen = 0;
- }
- to_send = (to_send > txlen) ? txlen : to_send;
-
- /* Convert to linear buffer */
- for (i = 0; i < to_send; ++i) {
- s->buf[i] = xmit->buf[xmit->tail];
- uart_xmit_advance(port, 1);
- }
-
- sc16is7xx_fifo_write(port, s->buf, to_send);
+ /* Limit to space available in TX FIFO */
+ txlen = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG);
+ if (txlen > SC16IS7XX_FIFO_SIZE) {
+ dev_err_ratelimited(port->dev,
+ "chip reports %d free bytes in TX fifo, but it only has %d",
+ txlen, SC16IS7XX_FIFO_SIZE);
+ txlen = 0;
}
+ txlen = uart_fifo_out(port, s->buf, txlen);
+ sc16is7xx_fifo_write(port, s->buf, txlen);
+
uart_port_lock_irqsave(port, &flags);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
sc16is7xx_stop_tx(port);
else
sc16is7xx_ier_set(port, SC16IS7XX_IER_THRI_BIT);
@@ -1463,15 +1454,15 @@ static const struct serial_rs485 sc16is7xx_rs485_supported = {
.delay_rts_after_send = 1, /* Not supported but keep returning -EINVAL */
};
-static int sc16is7xx_probe(struct device *dev,
- const struct sc16is7xx_devtype *devtype,
- struct regmap *regmaps[], int irq)
+int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype,
+ struct regmap *regmaps[], int irq)
{
unsigned long freq = 0, *pfreq = dev_get_platdata(dev);
unsigned int val;
u32 uartclk = 0;
int i, ret;
struct sc16is7xx_port *s;
+ bool port_registered[SC16IS7XX_MAX_PORTS];
for (i = 0; i < devtype->nr_uart; i++)
if (IS_ERR(regmaps[i]))
@@ -1536,13 +1527,19 @@ static int sc16is7xx_probe(struct device *dev,
regmap_write(regmaps[0], SC16IS7XX_IOCONTROL_REG,
SC16IS7XX_IOCONTROL_SRESET_BIT);
+ /* Mark each port line and status as uninitialised. */
for (i = 0; i < devtype->nr_uart; ++i) {
- s->p[i].port.line = find_first_zero_bit(sc16is7xx_lines,
- SC16IS7XX_MAX_DEVS);
- if (s->p[i].port.line >= SC16IS7XX_MAX_DEVS) {
- ret = -ERANGE;
+ s->p[i].port.line = SC16IS7XX_MAX_DEVS;
+ port_registered[i] = false;
+ }
+
+ for (i = 0; i < devtype->nr_uart; ++i) {
+ ret = ida_alloc_max(&sc16is7xx_lines,
+ SC16IS7XX_MAX_DEVS - 1, GFP_KERNEL);
+ if (ret < 0)
goto out_ports;
- }
+
+ s->p[i].port.line = ret;
/* Initialize port data */
s->p[i].port.dev = dev;
@@ -1588,7 +1585,7 @@ static int sc16is7xx_probe(struct device *dev,
if (ret)
goto out_ports;
- set_bit(s->p[i].port.line, sc16is7xx_lines);
+ port_registered[i] = true;
/* Enable EFR */
sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_LCR_REG,
@@ -1646,9 +1643,12 @@ static int sc16is7xx_probe(struct device *dev,
#endif
out_ports:
- for (i = 0; i < devtype->nr_uart; i++)
- if (test_and_clear_bit(s->p[i].port.line, sc16is7xx_lines))
+ for (i = 0; i < devtype->nr_uart; i++) {
+ if (s->p[i].port.line < SC16IS7XX_MAX_DEVS)
+ ida_free(&sc16is7xx_lines, s->p[i].port.line);
+ if (port_registered[i])
uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port);
+ }
kthread_stop(s->kworker_task);
@@ -1657,8 +1657,9 @@ out_clk:
return ret;
}
+EXPORT_SYMBOL_GPL(sc16is7xx_probe);
-static void sc16is7xx_remove(struct device *dev)
+void sc16is7xx_remove(struct device *dev)
{
struct sc16is7xx_port *s = dev_get_drvdata(dev);
int i;
@@ -1670,8 +1671,8 @@ static void sc16is7xx_remove(struct device *dev)
for (i = 0; i < s->devtype->nr_uart; i++) {
kthread_cancel_delayed_work_sync(&s->p[i].ms_work);
- if (test_and_clear_bit(s->p[i].port.line, sc16is7xx_lines))
- uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port);
+ ida_free(&sc16is7xx_lines, s->p[i].port.line);
+ uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port);
sc16is7xx_power(&s->p[i].port, 0);
}
@@ -1680,8 +1681,9 @@ static void sc16is7xx_remove(struct device *dev)
clk_disable_unprepare(s->clk);
}
+EXPORT_SYMBOL_GPL(sc16is7xx_remove);
-static const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = {
+const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = {
{ .compatible = "nxp,sc16is740", .data = &sc16is74x_devtype, },
{ .compatible = "nxp,sc16is741", .data = &sc16is74x_devtype, },
{ .compatible = "nxp,sc16is750", .data = &sc16is750_devtype, },
@@ -1690,13 +1692,14 @@ static const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = {
{ .compatible = "nxp,sc16is762", .data = &sc16is762_devtype, },
{ }
};
+EXPORT_SYMBOL_GPL(sc16is7xx_dt_ids);
MODULE_DEVICE_TABLE(of, sc16is7xx_dt_ids);
-static struct regmap_config regcfg = {
+const struct regmap_config sc16is7xx_regcfg = {
.reg_bits = 5,
.pad_bits = 3,
.val_bits = 8,
- .cache_type = REGCACHE_RBTREE,
+ .cache_type = REGCACHE_MAPLE,
.volatile_reg = sc16is7xx_regmap_volatile,
.precious_reg = sc16is7xx_regmap_precious,
.writeable_noinc_reg = sc16is7xx_regmap_noinc,
@@ -1705,8 +1708,9 @@ static struct regmap_config regcfg = {
.max_raw_write = SC16IS7XX_FIFO_SIZE,
.max_register = SC16IS7XX_EFCR_REG,
};
+EXPORT_SYMBOL_GPL(sc16is7xx_regcfg);
-static const char *sc16is7xx_regmap_name(u8 port_id)
+const char *sc16is7xx_regmap_name(u8 port_id)
{
switch (port_id) {
case 0: return "port0";
@@ -1716,184 +1720,27 @@ static const char *sc16is7xx_regmap_name(u8 port_id)
return NULL;
}
}
+EXPORT_SYMBOL_GPL(sc16is7xx_regmap_name);
-static unsigned int sc16is7xx_regmap_port_mask(unsigned int port_id)
+unsigned int sc16is7xx_regmap_port_mask(unsigned int port_id)
{
/* CH1,CH0 are at bits 2:1. */
return port_id << 1;
}
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_SPI
-static int sc16is7xx_spi_probe(struct spi_device *spi)
-{
- const struct sc16is7xx_devtype *devtype;
- struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
- unsigned int i;
- int ret;
-
- /* Setup SPI bus */
- spi->bits_per_word = 8;
- /* For all variants, only mode 0 is supported */
- if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0)
- return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n");
-
- spi->mode = spi->mode ? : SPI_MODE_0;
- spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ;
- ret = spi_setup(spi);
- if (ret)
- return ret;
-
- devtype = spi_get_device_match_data(spi);
- if (!devtype)
- return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n");
-
- for (i = 0; i < devtype->nr_uart; i++) {
- regcfg.name = sc16is7xx_regmap_name(i);
- /*
- * If read_flag_mask is 0, the regmap code sets it to a default
- * of 0x80. Since we specify our own mask, we must add the READ
- * bit ourselves:
- */
- regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) |
- SC16IS7XX_SPI_READ_BIT;
- regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
- regmaps[i] = devm_regmap_init_spi(spi, &regcfg);
- }
-
- return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq);
-}
-
-static void sc16is7xx_spi_remove(struct spi_device *spi)
-{
- sc16is7xx_remove(&spi->dev);
-}
-
-static const struct spi_device_id sc16is7xx_spi_id_table[] = {
- { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },
- { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, },
- { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, },
- { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },
- { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },
- { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },
- { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },
- { }
-};
-
-MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table);
-
-static struct spi_driver sc16is7xx_spi_uart_driver = {
- .driver = {
- .name = SC16IS7XX_NAME,
- .of_match_table = sc16is7xx_dt_ids,
- },
- .probe = sc16is7xx_spi_probe,
- .remove = sc16is7xx_spi_remove,
- .id_table = sc16is7xx_spi_id_table,
-};
-#endif
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_I2C
-static int sc16is7xx_i2c_probe(struct i2c_client *i2c)
-{
- const struct sc16is7xx_devtype *devtype;
- struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
- unsigned int i;
-
- devtype = i2c_get_match_data(i2c);
- if (!devtype)
- return dev_err_probe(&i2c->dev, -ENODEV, "Failed to match device\n");
-
- for (i = 0; i < devtype->nr_uart; i++) {
- regcfg.name = sc16is7xx_regmap_name(i);
- regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i);
- regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
- regmaps[i] = devm_regmap_init_i2c(i2c, &regcfg);
- }
-
- return sc16is7xx_probe(&i2c->dev, devtype, regmaps, i2c->irq);
-}
-
-static void sc16is7xx_i2c_remove(struct i2c_client *client)
-{
- sc16is7xx_remove(&client->dev);
-}
-
-static const struct i2c_device_id sc16is7xx_i2c_id_table[] = {
- { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },
- { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, },
- { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, },
- { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },
- { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },
- { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },
- { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, sc16is7xx_i2c_id_table);
-
-static struct i2c_driver sc16is7xx_i2c_uart_driver = {
- .driver = {
- .name = SC16IS7XX_NAME,
- .of_match_table = sc16is7xx_dt_ids,
- },
- .probe = sc16is7xx_i2c_probe,
- .remove = sc16is7xx_i2c_remove,
- .id_table = sc16is7xx_i2c_id_table,
-};
-
-#endif
+EXPORT_SYMBOL_GPL(sc16is7xx_regmap_port_mask);
static int __init sc16is7xx_init(void)
{
- int ret;
-
- ret = uart_register_driver(&sc16is7xx_uart);
- if (ret) {
- pr_err("Registering UART driver failed\n");
- return ret;
- }
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_I2C
- ret = i2c_add_driver(&sc16is7xx_i2c_uart_driver);
- if (ret < 0) {
- pr_err("failed to init sc16is7xx i2c --> %d\n", ret);
- goto err_i2c;
- }
-#endif
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_SPI
- ret = spi_register_driver(&sc16is7xx_spi_uart_driver);
- if (ret < 0) {
- pr_err("failed to init sc16is7xx spi --> %d\n", ret);
- goto err_spi;
- }
-#endif
- return ret;
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_SPI
-err_spi:
-#endif
-#ifdef CONFIG_SERIAL_SC16IS7XX_I2C
- i2c_del_driver(&sc16is7xx_i2c_uart_driver);
-err_i2c:
-#endif
- uart_unregister_driver(&sc16is7xx_uart);
- return ret;
+ return uart_register_driver(&sc16is7xx_uart);
}
module_init(sc16is7xx_init);
static void __exit sc16is7xx_exit(void)
{
-#ifdef CONFIG_SERIAL_SC16IS7XX_I2C
- i2c_del_driver(&sc16is7xx_i2c_uart_driver);
-#endif
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_SPI
- spi_unregister_driver(&sc16is7xx_spi_uart_driver);
-#endif
uart_unregister_driver(&sc16is7xx_uart);
}
module_exit(sc16is7xx_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jon Ringle <jringle@gridpoint.com>");
-MODULE_DESCRIPTION("SC16IS7XX serial driver");
+MODULE_DESCRIPTION("SC16IS7xx tty serial core driver");
diff --git a/drivers/tty/serial/sc16is7xx.h b/drivers/tty/serial/sc16is7xx.h
new file mode 100644
index 000000000000..afb784eaee45
--- /dev/null
+++ b/drivers/tty/serial/sc16is7xx.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/* SC16IS7xx SPI/I2C tty serial driver */
+
+#ifndef _SC16IS7XX_H_
+#define _SC16IS7XX_H_
+
+#include <linux/mod_devicetable.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+
+#define SC16IS7XX_NAME "sc16is7xx"
+#define SC16IS7XX_MAX_PORTS 2 /* Maximum number of UART ports per IC. */
+
+struct device;
+
+struct sc16is7xx_devtype {
+ char name[10];
+ int nr_gpio;
+ int nr_uart;
+};
+
+extern const struct regmap_config sc16is7xx_regcfg;
+
+extern const struct of_device_id sc16is7xx_dt_ids[];
+
+extern const struct sc16is7xx_devtype sc16is74x_devtype;
+extern const struct sc16is7xx_devtype sc16is750_devtype;
+extern const struct sc16is7xx_devtype sc16is752_devtype;
+extern const struct sc16is7xx_devtype sc16is760_devtype;
+extern const struct sc16is7xx_devtype sc16is762_devtype;
+
+const char *sc16is7xx_regmap_name(u8 port_id);
+
+unsigned int sc16is7xx_regmap_port_mask(unsigned int port_id);
+
+int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype,
+ struct regmap *regmaps[], int irq);
+
+void sc16is7xx_remove(struct device *dev);
+
+#endif /* _SC16IS7XX_H_ */
diff --git a/drivers/tty/serial/sc16is7xx_i2c.c b/drivers/tty/serial/sc16is7xx_i2c.c
new file mode 100644
index 000000000000..3ed47c306d85
--- /dev/null
+++ b/drivers/tty/serial/sc16is7xx_i2c.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* SC16IS7xx I2C interface driver */
+
+#include <linux/dev_printk.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/string.h>
+
+#include "sc16is7xx.h"
+
+static int sc16is7xx_i2c_probe(struct i2c_client *i2c)
+{
+ const struct sc16is7xx_devtype *devtype;
+ struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
+ struct regmap_config regcfg;
+ unsigned int i;
+
+ devtype = i2c_get_match_data(i2c);
+ if (!devtype)
+ return dev_err_probe(&i2c->dev, -ENODEV, "Failed to match device\n");
+
+ memcpy(&regcfg, &sc16is7xx_regcfg, sizeof(struct regmap_config));
+
+ for (i = 0; i < devtype->nr_uart; i++) {
+ regcfg.name = sc16is7xx_regmap_name(i);
+ regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i);
+ regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
+ regmaps[i] = devm_regmap_init_i2c(i2c, &regcfg);
+ }
+
+ return sc16is7xx_probe(&i2c->dev, devtype, regmaps, i2c->irq);
+}
+
+static void sc16is7xx_i2c_remove(struct i2c_client *client)
+{
+ sc16is7xx_remove(&client->dev);
+}
+
+static const struct i2c_device_id sc16is7xx_i2c_id_table[] = {
+ { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },
+ { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, },
+ { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, },
+ { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },
+ { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },
+ { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },
+ { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, sc16is7xx_i2c_id_table);
+
+static struct i2c_driver sc16is7xx_i2c_driver = {
+ .driver = {
+ .name = SC16IS7XX_NAME,
+ .of_match_table = sc16is7xx_dt_ids,
+ },
+ .probe = sc16is7xx_i2c_probe,
+ .remove = sc16is7xx_i2c_remove,
+ .id_table = sc16is7xx_i2c_id_table,
+};
+
+module_i2c_driver(sc16is7xx_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SC16IS7xx I2C interface driver");
+MODULE_IMPORT_NS(SERIAL_NXP_SC16IS7XX);
diff --git a/drivers/tty/serial/sc16is7xx_spi.c b/drivers/tty/serial/sc16is7xx_spi.c
new file mode 100644
index 000000000000..73df36f8a7fd
--- /dev/null
+++ b/drivers/tty/serial/sc16is7xx_spi.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* SC16IS7xx SPI interface driver */
+
+#include <linux/dev_printk.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/string.h>
+#include <linux/units.h>
+
+#include "sc16is7xx.h"
+
+/* SPI definitions */
+#define SC16IS7XX_SPI_READ_BIT BIT(7)
+
+static int sc16is7xx_spi_probe(struct spi_device *spi)
+{
+ const struct sc16is7xx_devtype *devtype;
+ struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
+ struct regmap_config regcfg;
+ unsigned int i;
+ int ret;
+
+ /* Setup SPI bus */
+ spi->bits_per_word = 8;
+ /* For all variants, only mode 0 is supported */
+ if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0)
+ return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n");
+
+ spi->mode = spi->mode ? : SPI_MODE_0;
+ spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ;
+ ret = spi_setup(spi);
+ if (ret)
+ return ret;
+
+ devtype = spi_get_device_match_data(spi);
+ if (!devtype)
+ return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n");
+
+ memcpy(&regcfg, &sc16is7xx_regcfg, sizeof(struct regmap_config));
+
+ for (i = 0; i < devtype->nr_uart; i++) {
+ regcfg.name = sc16is7xx_regmap_name(i);
+ /*
+ * If read_flag_mask is 0, the regmap code sets it to a default
+ * of 0x80. Since we specify our own mask, we must add the READ
+ * bit ourselves:
+ */
+ regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) |
+ SC16IS7XX_SPI_READ_BIT;
+ regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
+ regmaps[i] = devm_regmap_init_spi(spi, &regcfg);
+ }
+
+ return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq);
+}
+
+static void sc16is7xx_spi_remove(struct spi_device *spi)
+{
+ sc16is7xx_remove(&spi->dev);
+}
+
+static const struct spi_device_id sc16is7xx_spi_id_table[] = {
+ { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },
+ { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, },
+ { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, },
+ { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },
+ { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },
+ { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },
+ { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table);
+
+static struct spi_driver sc16is7xx_spi_driver = {
+ .driver = {
+ .name = SC16IS7XX_NAME,
+ .of_match_table = sc16is7xx_dt_ids,
+ },
+ .probe = sc16is7xx_spi_probe,
+ .remove = sc16is7xx_spi_remove,
+ .id_table = sc16is7xx_spi_id_table,
+};
+
+module_spi_driver(sc16is7xx_spi_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SC16IS7xx SPI interface driver");
+MODULE_IMPORT_NS(SERIAL_NXP_SC16IS7XX);
diff --git a/drivers/tty/serial/sccnxp.c b/drivers/tty/serial/sccnxp.c
index f24217a560d7..6d1d142fd216 100644
--- a/drivers/tty/serial/sccnxp.c
+++ b/drivers/tty/serial/sccnxp.c
@@ -439,7 +439,7 @@ static void sccnxp_handle_rx(struct uart_port *port)
static void sccnxp_handle_tx(struct uart_port *port)
{
u8 sr;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
struct sccnxp_port *s = dev_get_drvdata(port->dev);
if (unlikely(port->x_char)) {
@@ -449,7 +449,7 @@ static void sccnxp_handle_tx(struct uart_port *port)
return;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
/* Disable TX if FIFO is empty */
if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXEMT) {
sccnxp_disable_irq(port, IMR_TXRDY);
@@ -461,16 +461,20 @@ static void sccnxp_handle_tx(struct uart_port *port)
return;
}
- while (!uart_circ_empty(xmit)) {
+ while (1) {
+ unsigned char ch;
+
sr = sccnxp_port_read(port, SCCNXP_SR_REG);
if (!(sr & SR_TXRDY))
break;
- sccnxp_port_write(port, SCCNXP_THR_REG, xmit->buf[xmit->tail]);
- uart_xmit_advance(port, 1);
+ if (!uart_fifo_get(port, &ch))
+ break;
+
+ sccnxp_port_write(port, SCCNXP_THR_REG, ch);
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index 525f3a2f7bd4..1183ca54ab92 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -484,18 +484,18 @@ static void tegra_uart_release_port(struct uart_port *u)
static void tegra_uart_fill_tx_fifo(struct tegra_uart_port *tup, int max_bytes)
{
- struct circ_buf *xmit = &tup->uport.state->xmit;
+ unsigned char ch;
int i;
for (i = 0; i < max_bytes; i++) {
- BUG_ON(uart_circ_empty(xmit));
if (tup->cdata->tx_fifo_full_status) {
unsigned long lsr = tegra_uart_read(tup, UART_LSR);
if ((lsr & TEGRA_UART_LSR_TXFIFO_FULL))
break;
}
- tegra_uart_write(tup, xmit->buf[xmit->tail], UART_TX);
- uart_xmit_advance(&tup->uport, 1);
+ if (WARN_ON_ONCE(!uart_fifo_get(&tup->uport, &ch)))
+ break;
+ tegra_uart_write(tup, ch, UART_TX);
}
}
@@ -514,7 +514,7 @@ static void tegra_uart_start_pio_tx(struct tegra_uart_port *tup,
static void tegra_uart_tx_dma_complete(void *args)
{
struct tegra_uart_port *tup = args;
- struct circ_buf *xmit = &tup->uport.state->xmit;
+ struct tty_port *tport = &tup->uport.state->port;
struct dma_tx_state state;
unsigned long flags;
unsigned int count;
@@ -525,7 +525,7 @@ static void tegra_uart_tx_dma_complete(void *args)
uart_port_lock_irqsave(&tup->uport, &flags);
uart_xmit_advance(&tup->uport, count);
tup->tx_in_progress = 0;
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&tup->uport);
tegra_uart_start_next_tx(tup);
uart_port_unlock_irqrestore(&tup->uport, flags);
@@ -534,11 +534,14 @@ static void tegra_uart_tx_dma_complete(void *args)
static int tegra_uart_start_tx_dma(struct tegra_uart_port *tup,
unsigned long count)
{
- struct circ_buf *xmit = &tup->uport.state->xmit;
+ struct tty_port *tport = &tup->uport.state->port;
dma_addr_t tx_phys_addr;
+ unsigned int tail;
tup->tx_bytes = count & ~(0xF);
- tx_phys_addr = tup->tx_dma_buf_phys + xmit->tail;
+ WARN_ON_ONCE(kfifo_out_linear(&tport->xmit_fifo, &tail,
+ UART_XMIT_SIZE) < count);
+ tx_phys_addr = tup->tx_dma_buf_phys + tail;
dma_sync_single_for_device(tup->uport.dev, tx_phys_addr,
tup->tx_bytes, DMA_TO_DEVICE);
@@ -562,18 +565,21 @@ static int tegra_uart_start_tx_dma(struct tegra_uart_port *tup,
static void tegra_uart_start_next_tx(struct tegra_uart_port *tup)
{
+ struct tty_port *tport = &tup->uport.state->port;
+ unsigned char *tail_ptr;
unsigned long tail;
- unsigned long count;
- struct circ_buf *xmit = &tup->uport.state->xmit;
+ unsigned int count;
if (!tup->current_baud)
return;
- tail = (unsigned long)&xmit->buf[xmit->tail];
- count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ count = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail_ptr,
+ UART_XMIT_SIZE);
if (!count)
return;
+ tail = (unsigned long)tail_ptr;
+
if (tup->use_tx_pio || count < TEGRA_UART_MIN_DMA)
tegra_uart_start_pio_tx(tup, count);
else if (BYTES_TO_ALIGN(tail) > 0)
@@ -586,9 +592,9 @@ static void tegra_uart_start_next_tx(struct tegra_uart_port *tup)
static void tegra_uart_start_tx(struct uart_port *u)
{
struct tegra_uart_port *tup = to_tegra_uport(u);
- struct circ_buf *xmit = &u->state->xmit;
+ struct tty_port *tport = &u->state->port;
- if (!uart_circ_empty(xmit) && !tup->tx_in_progress)
+ if (!kfifo_is_empty(&tport->xmit_fifo) && !tup->tx_in_progress)
tegra_uart_start_next_tx(tup);
}
@@ -628,11 +634,11 @@ static void tegra_uart_stop_tx(struct uart_port *u)
static void tegra_uart_handle_tx_pio(struct tegra_uart_port *tup)
{
- struct circ_buf *xmit = &tup->uport.state->xmit;
+ struct tty_port *tport = &tup->uport.state->port;
tegra_uart_fill_tx_fifo(tup, tup->tx_bytes);
tup->tx_in_progress = 0;
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&tup->uport);
tegra_uart_start_next_tx(tup);
}
@@ -1169,15 +1175,14 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup,
tup->rx_dma_buf_virt = dma_buf;
tup->rx_dma_buf_phys = dma_phys;
} else {
+ dma_buf = tup->uport.state->port.xmit_buf;
dma_phys = dma_map_single(tup->uport.dev,
- tup->uport.state->xmit.buf, UART_XMIT_SIZE,
- DMA_TO_DEVICE);
+ dma_buf, UART_XMIT_SIZE, DMA_TO_DEVICE);
if (dma_mapping_error(tup->uport.dev, dma_phys)) {
dev_err(tup->uport.dev, "dma_map_single tx failed\n");
dma_release_channel(dma_chan);
return -ENOMEM;
}
- dma_buf = tup->uport.state->xmit.buf;
dma_sconfig.dst_addr = tup->uport.mapbase;
dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
dma_sconfig.dst_maxburst = 16;
diff --git a/drivers/tty/serial/serial_base.h b/drivers/tty/serial/serial_base.h
index b6c38d2edfd4..743a72ac34f3 100644
--- a/drivers/tty/serial/serial_base.h
+++ b/drivers/tty/serial/serial_base.h
@@ -49,3 +49,33 @@ void serial_ctrl_unregister_port(struct uart_driver *drv, struct uart_port *port
int serial_core_register_port(struct uart_driver *drv, struct uart_port *port);
void serial_core_unregister_port(struct uart_driver *drv, struct uart_port *port);
+
+#ifdef CONFIG_SERIAL_CORE_CONSOLE
+
+int serial_base_add_preferred_console(struct uart_driver *drv,
+ struct uart_port *port);
+
+#else
+
+static inline
+int serial_base_add_preferred_console(struct uart_driver *drv,
+ struct uart_port *port)
+{
+ return 0;
+}
+
+#endif
+
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+
+int serial_base_add_isa_preferred_console(const char *name, int idx);
+
+#else
+
+static inline
+int serial_base_add_isa_preferred_console(const char *name, int idx)
+{
+ return 0;
+}
+
+#endif
diff --git a/drivers/tty/serial/serial_base_bus.c b/drivers/tty/serial/serial_base_bus.c
index 4df2a4b10445..73c6ee540c83 100644
--- a/drivers/tty/serial/serial_base_bus.c
+++ b/drivers/tty/serial/serial_base_bus.c
@@ -8,6 +8,7 @@
* The serial core bus manages the serial core controller instances.
*/
+#include <linux/cleanup.h>
#include <linux/container_of.h>
#include <linux/device.h>
#include <linux/idr.h>
@@ -204,6 +205,134 @@ void serial_base_port_device_remove(struct serial_port_device *port_dev)
put_device(&port_dev->dev);
}
+#ifdef CONFIG_SERIAL_CORE_CONSOLE
+
+static int serial_base_add_one_prefcon(const char *match, const char *dev_name,
+ int port_id)
+{
+ int ret;
+
+ ret = add_preferred_console_match(match, dev_name, port_id);
+ if (ret == -ENOENT)
+ return 0;
+
+ return ret;
+}
+
+#ifdef __sparc__
+
+/* Handle Sparc ttya and ttyb options as done in console_setup() */
+static int serial_base_add_sparc_console(const char *dev_name, int idx)
+{
+ const char *name;
+
+ switch (idx) {
+ case 0:
+ name = "ttya";
+ break;
+ case 1:
+ name = "ttyb";
+ break;
+ default:
+ return 0;
+ }
+
+ return serial_base_add_one_prefcon(name, dev_name, idx);
+}
+
+#else
+
+static inline int serial_base_add_sparc_console(const char *dev_name, int idx)
+{
+ return 0;
+}
+
+#endif
+
+static int serial_base_add_prefcon(const char *name, int idx)
+{
+ const char *char_match __free(kfree) = NULL;
+ const char *nmbr_match __free(kfree) = NULL;
+ int ret;
+
+ /* Handle ttyS specific options */
+ if (strstarts(name, "ttyS")) {
+ /* No name, just a number */
+ nmbr_match = kasprintf(GFP_KERNEL, "%i", idx);
+ if (!nmbr_match)
+ return -ENODEV;
+
+ ret = serial_base_add_one_prefcon(nmbr_match, name, idx);
+ if (ret)
+ return ret;
+
+ /* Sparc ttya and ttyb */
+ ret = serial_base_add_sparc_console(name, idx);
+ if (ret)
+ return ret;
+ }
+
+ /* Handle the traditional character device name style console=ttyS0 */
+ char_match = kasprintf(GFP_KERNEL, "%s%i", name, idx);
+ if (!char_match)
+ return -ENOMEM;
+
+ return serial_base_add_one_prefcon(char_match, name, idx);
+}
+
+/**
+ * serial_base_add_preferred_console - Adds a preferred console
+ * @drv: Serial port device driver
+ * @port: Serial port instance
+ *
+ * Tries to add a preferred console for a serial port if specified in the
+ * kernel command line. Supports both the traditional character device such
+ * as console=ttyS0, and a hardware addressing based console=DEVNAME:0.0
+ * style name.
+ *
+ * Translates the kernel command line option using a hardware based addressing
+ * console=DEVNAME:0.0 to the serial port character device such as ttyS0.
+ * Cannot be called early for ISA ports, depends on struct device.
+ *
+ * Note that duplicates are ignored by add_preferred_console().
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int serial_base_add_preferred_console(struct uart_driver *drv,
+ struct uart_port *port)
+{
+ const char *port_match __free(kfree) = NULL;
+ int ret;
+
+ ret = serial_base_add_prefcon(drv->dev_name, port->line);
+ if (ret)
+ return ret;
+
+ port_match = kasprintf(GFP_KERNEL, "%s:%i.%i", dev_name(port->dev),
+ port->ctrl_id, port->port_id);
+ if (!port_match)
+ return -ENOMEM;
+
+ /* Translate a hardware addressing style console=DEVNAME:0.0 */
+ return serial_base_add_one_prefcon(port_match, drv->dev_name, port->line);
+}
+
+#endif
+
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+
+/*
+ * Early ISA ports initialize the console before there is no struct device.
+ * This should be only called from serial8250_isa_init_preferred_console(),
+ * other callers are likely wrong and should rely on earlycon instead.
+ */
+int serial_base_add_isa_preferred_console(const char *name, int idx)
+{
+ return serial_base_add_prefcon(name, idx);
+}
+
+#endif
+
static int serial_base_init(void)
{
int ret;
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index c476d884356d..2c1a0254d3f4 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -243,25 +243,12 @@ static void uart_change_line_settings(struct tty_struct *tty, struct uart_state
uart_port_unlock_irq(uport);
}
-/*
- * Startup the port. This will be called once per open. All calls
- * will be serialised by the per-port mutex.
- */
-static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
- bool init_hw)
+static int uart_alloc_xmit_buf(struct tty_port *port)
{
- struct uart_port *uport = uart_port_check(state);
+ struct uart_state *state = container_of(port, struct uart_state, port);
+ struct uart_port *uport;
unsigned long flags;
unsigned long page;
- int retval = 0;
-
- if (uport->type == PORT_UNKNOWN)
- return 1;
-
- /*
- * Make sure the device is in D0 state.
- */
- uart_change_pm(state, UART_PM_STATE_ON);
/*
* Initialise and allocate the transmit and temporary
@@ -271,20 +258,68 @@ static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
if (!page)
return -ENOMEM;
- uart_port_lock(state, flags);
- if (!state->xmit.buf) {
- state->xmit.buf = (unsigned char *) page;
- uart_circ_clear(&state->xmit);
+ uport = uart_port_lock(state, flags);
+ if (!state->port.xmit_buf) {
+ state->port.xmit_buf = (unsigned char *)page;
+ kfifo_init(&state->port.xmit_fifo, state->port.xmit_buf,
+ PAGE_SIZE);
uart_port_unlock(uport, flags);
} else {
uart_port_unlock(uport, flags);
/*
* Do not free() the page under the port lock, see
- * uart_shutdown().
+ * uart_free_xmit_buf().
*/
free_page(page);
}
+ return 0;
+}
+
+static void uart_free_xmit_buf(struct tty_port *port)
+{
+ struct uart_state *state = container_of(port, struct uart_state, port);
+ struct uart_port *uport;
+ unsigned long flags;
+ char *xmit_buf;
+
+ /*
+ * Do not free() the transmit buffer page under the port lock since
+ * this can create various circular locking scenarios. For instance,
+ * console driver may need to allocate/free a debug object, which
+ * can end up in printk() recursion.
+ */
+ uport = uart_port_lock(state, flags);
+ xmit_buf = port->xmit_buf;
+ port->xmit_buf = NULL;
+ INIT_KFIFO(port->xmit_fifo);
+ uart_port_unlock(uport, flags);
+
+ free_page((unsigned long)xmit_buf);
+}
+
+/*
+ * Startup the port. This will be called once per open. All calls
+ * will be serialised by the per-port mutex.
+ */
+static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
+ bool init_hw)
+{
+ struct uart_port *uport = uart_port_check(state);
+ int retval;
+
+ if (uport->type == PORT_UNKNOWN)
+ return 1;
+
+ /*
+ * Make sure the device is in D0 state.
+ */
+ uart_change_pm(state, UART_PM_STATE_ON);
+
+ retval = uart_alloc_xmit_buf(&state->port);
+ if (retval)
+ return retval;
+
retval = uport->ops->startup(uport);
if (retval == 0) {
if (uart_console(uport) && uport->cons->cflag) {
@@ -356,8 +391,6 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
{
struct uart_port *uport = uart_port_check(state);
struct tty_port *port = &state->port;
- unsigned long flags;
- char *xmit_buf = NULL;
/*
* Set the TTY IO error marker
@@ -393,18 +426,7 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
*/
tty_port_set_suspended(port, false);
- /*
- * Do not free() the transmit buffer page under the port lock since
- * this can create various circular locking scenarios. For instance,
- * console driver may need to allocate/free a debug object, which
- * can endup in printk() recursion.
- */
- uart_port_lock(state, flags);
- xmit_buf = state->xmit.buf;
- state->xmit.buf = NULL;
- uart_port_unlock(uport, flags);
-
- free_page((unsigned long)xmit_buf);
+ uart_free_xmit_buf(port);
}
/**
@@ -565,22 +587,17 @@ static int uart_put_char(struct tty_struct *tty, u8 c)
{
struct uart_state *state = tty->driver_data;
struct uart_port *port;
- struct circ_buf *circ;
unsigned long flags;
int ret = 0;
- circ = &state->xmit;
port = uart_port_lock(state, flags);
- if (!circ->buf) {
+ if (!state->port.xmit_buf) {
uart_port_unlock(port, flags);
return 0;
}
- if (port && uart_circ_chars_free(circ) != 0) {
- circ->buf[circ->head] = c;
- circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1);
- ret = 1;
- }
+ if (port)
+ ret = kfifo_put(&state->port.xmit_fifo, c);
uart_port_unlock(port, flags);
return ret;
}
@@ -594,9 +611,8 @@ static ssize_t uart_write(struct tty_struct *tty, const u8 *buf, size_t count)
{
struct uart_state *state = tty->driver_data;
struct uart_port *port;
- struct circ_buf *circ;
unsigned long flags;
- int c, ret = 0;
+ int ret = 0;
/*
* This means you called this function _after_ the port was
@@ -606,24 +622,13 @@ static ssize_t uart_write(struct tty_struct *tty, const u8 *buf, size_t count)
return -EL3HLT;
port = uart_port_lock(state, flags);
- circ = &state->xmit;
- if (!circ->buf) {
+ if (WARN_ON_ONCE(!state->port.xmit_buf)) {
uart_port_unlock(port, flags);
return 0;
}
- while (port) {
- c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
- if (count < c)
- c = count;
- if (c <= 0)
- break;
- memcpy(circ->buf + circ->head, buf, c);
- circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);
- buf += c;
- count -= c;
- ret += c;
- }
+ if (port)
+ ret = kfifo_in(&state->port.xmit_fifo, buf, count);
__uart_start(state);
uart_port_unlock(port, flags);
@@ -638,7 +643,7 @@ static unsigned int uart_write_room(struct tty_struct *tty)
unsigned int ret;
port = uart_port_lock(state, flags);
- ret = uart_circ_chars_free(&state->xmit);
+ ret = kfifo_avail(&state->port.xmit_fifo);
uart_port_unlock(port, flags);
return ret;
}
@@ -651,7 +656,7 @@ static unsigned int uart_chars_in_buffer(struct tty_struct *tty)
unsigned int ret;
port = uart_port_lock(state, flags);
- ret = uart_circ_chars_pending(&state->xmit);
+ ret = kfifo_len(&state->port.xmit_fifo);
uart_port_unlock(port, flags);
return ret;
}
@@ -674,7 +679,7 @@ static void uart_flush_buffer(struct tty_struct *tty)
port = uart_port_lock(state, flags);
if (!port)
return;
- uart_circ_clear(&state->xmit);
+ kfifo_reset(&state->port.xmit_fifo);
if (port->ops->flush_buffer)
port->ops->flush_buffer(port);
uart_port_unlock(port, flags);
@@ -1077,7 +1082,7 @@ static int uart_get_lsr_info(struct tty_struct *tty,
* interrupt happens).
*/
if (uport->x_char ||
- ((uart_circ_chars_pending(&state->xmit) > 0) &&
+ (!kfifo_is_empty(&state->port.xmit_fifo) &&
!uart_tx_stopped(uport)))
result &= ~TIOCSER_TEMT;
@@ -1775,7 +1780,6 @@ static void uart_tty_port_shutdown(struct tty_port *port)
{
struct uart_state *state = container_of(port, struct uart_state, port);
struct uart_port *uport = uart_port_check(state);
- char *buf;
/*
* At this point, we stop accepting input. To do this, we
@@ -1798,16 +1802,7 @@ static void uart_tty_port_shutdown(struct tty_port *port)
*/
tty_port_set_suspended(port, false);
- /*
- * Free the transmit buffer.
- */
- uart_port_lock_irq(uport);
- uart_circ_clear(&state->xmit);
- buf = state->xmit.buf;
- state->xmit.buf = NULL;
- uart_port_unlock_irq(uport);
-
- free_page((unsigned long)buf);
+ uart_free_xmit_buf(port);
uart_change_pm(state, UART_PM_STATE_OFF);
}
@@ -2413,6 +2408,7 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
uport->ops->stop_rx(uport);
uart_port_unlock_irq(uport);
}
+ device_set_awake_path(uport->dev);
goto unlock;
}
@@ -3211,6 +3207,9 @@ static int serial_core_add_one_port(struct uart_driver *drv, struct uart_port *u
if (uport->attr_group)
uport->tty_groups[1] = uport->attr_group;
+ /* Ensure serdev drivers can call serdev_device_open() right away */
+ uport->flags &= ~UPF_DEAD;
+
/*
* Register the port whether it's detected or not. This allows
* setserial to be used to alter this port's parameters.
@@ -3221,6 +3220,7 @@ static int serial_core_add_one_port(struct uart_driver *drv, struct uart_port *u
if (!IS_ERR(tty_dev)) {
device_set_wakeup_capable(tty_dev, 1);
} else {
+ uport->flags |= UPF_DEAD;
dev_err(uport->dev, "Cannot register tty device on line %d\n",
uport->line);
}
@@ -3422,11 +3422,13 @@ int serial_core_register_port(struct uart_driver *drv, struct uart_port *port)
if (ret)
goto err_unregister_ctrl_dev;
- ret = serial_core_add_one_port(drv, port);
+ ret = serial_base_add_preferred_console(drv, port);
if (ret)
goto err_unregister_port_dev;
- port->flags &= ~UPF_DEAD;
+ ret = serial_core_add_one_port(drv, port);
+ if (ret)
+ goto err_unregister_port_dev;
mutex_unlock(&port_mutex);
diff --git a/drivers/tty/serial/serial_port.c b/drivers/tty/serial/serial_port.c
index 7e3a1c7b097c..91a338d3cb34 100644
--- a/drivers/tty/serial/serial_port.c
+++ b/drivers/tty/serial/serial_port.c
@@ -11,6 +11,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/pnp.h>
#include <linux/property.h>
#include <linux/serial_core.h>
#include <linux/spinlock.h>
@@ -23,7 +24,7 @@
static int __serial_port_busy(struct uart_port *port)
{
return !uart_tx_stopped(port) &&
- uart_circ_chars_pending(&port->state->xmit);
+ !kfifo_is_empty(&port->state->port.xmit_fifo);
}
static int serial_port_runtime_resume(struct device *dev)
@@ -255,7 +256,11 @@ static int __uart_read_properties(struct uart_port *port, bool use_defaults)
if (dev_is_platform(dev))
ret = platform_get_irq(to_platform_device(dev), 0);
- else
+ else if (dev_is_pnp(dev)) {
+ ret = pnp_irq(to_pnp_dev(dev), 0);
+ if (ret < 0)
+ ret = -ENXIO;
+ } else
ret = fwnode_irq_get(dev_fwnode(dev), 0);
if (ret == -EPROBE_DEFER)
return ret;
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index e512eaa57ed5..f738980a8b2c 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -585,7 +585,7 @@ static void sci_start_tx(struct uart_port *port)
sci_serial_out(port, SCSCR, new);
}
- if (s->chan_tx && !uart_circ_empty(&s->port.state->xmit) &&
+ if (s->chan_tx && !kfifo_is_empty(&port->state->port.xmit_fifo) &&
dma_submit_error(s->cookie_tx)) {
if (s->cfg->regtype == SCIx_RZ_SCIFA_REGTYPE)
/* Switch irq from SCIF to DMA */
@@ -817,7 +817,7 @@ static int sci_rxfill(struct uart_port *port)
static void sci_transmit_chars(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
unsigned int stopped = uart_tx_stopped(port);
unsigned short status;
unsigned short ctrl;
@@ -826,7 +826,7 @@ static void sci_transmit_chars(struct uart_port *port)
status = sci_serial_in(port, SCxSR);
if (!(status & SCxSR_TDxE(port))) {
ctrl = sci_serial_in(port, SCSCR);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
ctrl &= ~SCSCR_TIE;
else
ctrl |= SCSCR_TIE;
@@ -842,15 +842,14 @@ static void sci_transmit_chars(struct uart_port *port)
if (port->x_char) {
c = port->x_char;
port->x_char = 0;
- } else if (!uart_circ_empty(xmit) && !stopped) {
- c = xmit->buf[xmit->tail];
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- } else if (port->type == PORT_SCI && uart_circ_empty(xmit)) {
- ctrl = sci_serial_in(port, SCSCR);
- ctrl &= ~SCSCR_TE;
- sci_serial_out(port, SCSCR, ctrl);
- return;
- } else {
+ } else if (stopped || !kfifo_get(&tport->xmit_fifo, &c)) {
+ if (port->type == PORT_SCI &&
+ kfifo_is_empty(&tport->xmit_fifo)) {
+ ctrl = sci_serial_in(port, SCSCR);
+ ctrl &= ~SCSCR_TE;
+ sci_serial_out(port, SCSCR, ctrl);
+ return;
+ }
break;
}
@@ -861,9 +860,9 @@ static void sci_transmit_chars(struct uart_port *port)
sci_clear_SCxSR(port, SCxSR_TDxE_CLEAR(port));
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit)) {
+ if (kfifo_is_empty(&tport->xmit_fifo)) {
if (port->type == PORT_SCI) {
ctrl = sci_serial_in(port, SCSCR);
ctrl &= ~SCSCR_TIE;
@@ -1199,7 +1198,7 @@ static void sci_dma_tx_complete(void *arg)
{
struct sci_port *s = arg;
struct uart_port *port = &s->port;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
unsigned long flags;
dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
@@ -1208,10 +1207,10 @@ static void sci_dma_tx_complete(void *arg)
uart_xmit_advance(port, s->tx_dma_len);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (!uart_circ_empty(xmit)) {
+ if (!kfifo_is_empty(&tport->xmit_fifo)) {
s->cookie_tx = 0;
schedule_work(&s->work_tx);
} else {
@@ -1258,6 +1257,7 @@ static int sci_dma_rx_find_active(struct sci_port *s)
return -1;
}
+/* Must only be called with uart_port_lock taken */
static void sci_dma_rx_chan_invalidate(struct sci_port *s)
{
unsigned int i;
@@ -1271,9 +1271,14 @@ static void sci_dma_rx_chan_invalidate(struct sci_port *s)
static void sci_dma_rx_release(struct sci_port *s)
{
struct dma_chan *chan = s->chan_rx_saved;
+ struct uart_port *port = &s->port;
+ unsigned long flags;
+ uart_port_lock_irqsave(port, &flags);
s->chan_rx_saved = NULL;
sci_dma_rx_chan_invalidate(s);
+ uart_port_unlock_irqrestore(port, flags);
+
dmaengine_terminate_sync(chan);
dma_free_coherent(chan->device->dev, s->buf_len_rx * 2, s->rx_buf[0],
sg_dma_address(&s->sg_rx[0]));
@@ -1319,14 +1324,14 @@ static void sci_dma_rx_complete(void *arg)
dev_dbg(port->dev, "%s(%d) active cookie %d\n", __func__, port->line,
s->active_rx);
+ hrtimer_cancel(&s->rx_timer);
+
uart_port_lock_irqsave(port, &flags);
active = sci_dma_rx_find_active(s);
if (active >= 0)
count = sci_dma_rx_push(s, s->rx_buf[active], s->buf_len_rx);
- start_hrtimer_us(&s->rx_timer, s->rx_timeout);
-
if (count)
tty_flip_buffer_push(&port->state->port);
@@ -1349,17 +1354,18 @@ static void sci_dma_rx_complete(void *arg)
uart_port_unlock_irqrestore(port, flags);
dev_dbg(port->dev, "%s: cookie %d #%d, new active cookie %d\n",
__func__, s->cookie_rx[active], active, s->active_rx);
+
+ start_hrtimer_us(&s->rx_timer, s->rx_timeout);
+
return;
fail:
- uart_port_unlock_irqrestore(port, flags);
- dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n");
/* Switch to PIO */
- uart_port_lock_irqsave(port, &flags);
dmaengine_terminate_async(chan);
sci_dma_rx_chan_invalidate(s);
sci_dma_rx_reenable_irq(s);
uart_port_unlock_irqrestore(port, flags);
+ dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n");
}
static void sci_dma_tx_release(struct sci_port *s)
@@ -1424,10 +1430,10 @@ static void sci_dma_tx_work_fn(struct work_struct *work)
struct dma_async_tx_descriptor *desc;
struct dma_chan *chan = s->chan_tx;
struct uart_port *port = &s->port;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
unsigned long flags;
+ unsigned int tail;
dma_addr_t buf;
- int head, tail;
/*
* DMA is idle now.
@@ -1437,10 +1443,9 @@ static void sci_dma_tx_work_fn(struct work_struct *work)
* consistent xmit buffer state.
*/
uart_port_lock_irq(port);
- head = xmit->head;
- tail = xmit->tail;
+ s->tx_dma_len = kfifo_out_linear(&tport->xmit_fifo, &tail,
+ UART_XMIT_SIZE);
buf = s->tx_dma_addr + tail;
- s->tx_dma_len = CIRC_CNT_TO_END(head, tail, UART_XMIT_SIZE);
if (!s->tx_dma_len) {
/* Transmit buffer has been flushed */
uart_port_unlock_irq(port);
@@ -1469,8 +1474,8 @@ static void sci_dma_tx_work_fn(struct work_struct *work)
}
uart_port_unlock_irq(port);
- dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n",
- __func__, xmit->buf, tail, head, s->cookie_tx);
+ dev_dbg(port->dev, "%s: %p: %u, cookie %d\n",
+ __func__, tport->xmit_buf, tail, s->cookie_tx);
dma_async_issue_pending(chan);
return;
@@ -1585,6 +1590,7 @@ static struct dma_chan *sci_request_dma_chan(struct uart_port *port,
static void sci_request_dma(struct uart_port *port)
{
struct sci_port *s = to_sci_port(port);
+ struct tty_port *tport = &port->state->port;
struct dma_chan *chan;
dev_dbg(port->dev, "%s: port %d\n", __func__, port->line);
@@ -1613,7 +1619,7 @@ static void sci_request_dma(struct uart_port *port)
if (chan) {
/* UART circular tx buffer is an aligned page. */
s->tx_dma_addr = dma_map_single(chan->device->dev,
- port->state->xmit.buf,
+ tport->xmit_buf,
UART_XMIT_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(chan->device->dev, s->tx_dma_addr)) {
@@ -1622,7 +1628,7 @@ static void sci_request_dma(struct uart_port *port)
} else {
dev_dbg(port->dev, "%s: mapped %lu@%p to %pad\n",
__func__, UART_XMIT_SIZE,
- port->state->xmit.buf, &s->tx_dma_addr);
+ tport->xmit_buf, &s->tx_dma_addr);
INIT_WORK(&s->work_tx, sci_dma_tx_work_fn);
s->chan_tx_saved = s->chan_tx = chan;
diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c
index 0670fd9f8496..cbfce65c9d22 100644
--- a/drivers/tty/serial/sifive.c
+++ b/drivers/tty/serial/sifive.c
@@ -761,7 +761,7 @@ static int __init early_sifive_serial_setup(struct earlycon_device *dev,
}
OF_EARLYCON_DECLARE(sifive, "sifive,uart0", early_sifive_serial_setup);
-OF_EARLYCON_DECLARE(sifive, "sifive,fu540-c000-uart0",
+OF_EARLYCON_DECLARE(sifive, "sifive,fu540-c000-uart",
early_sifive_serial_setup);
#endif /* CONFIG_SERIAL_EARLYCON */
@@ -1032,7 +1032,7 @@ static DEFINE_SIMPLE_DEV_PM_OPS(sifive_uart_pm_ops, sifive_serial_suspend,
sifive_serial_resume);
static const struct of_device_id sifive_serial_of_match[] = {
- { .compatible = "sifive,fu540-c000-uart0" },
+ { .compatible = "sifive,fu540-c000-uart" },
{ .compatible = "sifive,uart0" },
{},
};
diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
index 15f14fa593da..3fc54cc02a1f 100644
--- a/drivers/tty/serial/sprd_serial.c
+++ b/drivers/tty/serial/sprd_serial.c
@@ -227,13 +227,13 @@ static int sprd_tx_buf_remap(struct uart_port *port)
{
struct sprd_uart_port *sp =
container_of(port, struct sprd_uart_port, port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
+ unsigned char *tail;
- sp->tx_dma.trans_len =
- CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ sp->tx_dma.trans_len = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail,
+ UART_XMIT_SIZE);
- sp->tx_dma.phys_addr = dma_map_single(port->dev,
- (void *)&(xmit->buf[xmit->tail]),
+ sp->tx_dma.phys_addr = dma_map_single(port->dev, tail,
sp->tx_dma.trans_len,
DMA_TO_DEVICE);
return dma_mapping_error(port->dev, sp->tx_dma.phys_addr);
@@ -244,7 +244,7 @@ static void sprd_complete_tx_dma(void *data)
struct uart_port *port = (struct uart_port *)data;
struct sprd_uart_port *sp =
container_of(port, struct sprd_uart_port, port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
unsigned long flags;
uart_port_lock_irqsave(port, &flags);
@@ -253,10 +253,10 @@ static void sprd_complete_tx_dma(void *data)
uart_xmit_advance(port, sp->tx_dma.trans_len);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit) || sprd_tx_buf_remap(port) ||
+ if (kfifo_is_empty(&tport->xmit_fifo) || sprd_tx_buf_remap(port) ||
sprd_tx_dma_config(port))
sp->tx_dma.trans_len = 0;
@@ -319,7 +319,7 @@ static void sprd_start_tx_dma(struct uart_port *port)
{
struct sprd_uart_port *sp =
container_of(port, struct sprd_uart_port, port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
if (port->x_char) {
serial_out(port, SPRD_TXD, port->x_char);
@@ -328,7 +328,7 @@ static void sprd_start_tx_dma(struct uart_port *port)
return;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
sprd_stop_tx_dma(port);
return;
}
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index a23e59551848..f91753a40a69 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -387,9 +387,9 @@ static unsigned int asc_get_mctrl(struct uart_port *port)
/* There are probably characters waiting to be transmitted. */
static void asc_start_tx(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
- if (!uart_circ_empty(xmit))
+ if (!kfifo_is_empty(&tport->xmit_fifo))
asc_enable_tx_interrupts(port);
}
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 4fa5a03ebac0..e1e7bc04c579 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -696,18 +696,23 @@ static void stm32_usart_transmit_chars_pio(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
+
+ while (1) {
+ unsigned char ch;
- while (!uart_circ_empty(xmit)) {
/* Check that TDR is empty before filling FIFO */
if (!(readl_relaxed(port->membase + ofs->isr) & USART_SR_TXE))
break;
- writel_relaxed(xmit->buf[xmit->tail], port->membase + ofs->tdr);
- uart_xmit_advance(port, 1);
+
+ if (!uart_fifo_get(port, &ch))
+ break;
+
+ writel_relaxed(ch, port->membase + ofs->tdr);
}
/* rely on TXE irq (mask or unmask) for sending remaining data */
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
stm32_usart_tx_interrupt_disable(port);
else
stm32_usart_tx_interrupt_enable(port);
@@ -716,7 +721,7 @@ static void stm32_usart_transmit_chars_pio(struct uart_port *port)
static void stm32_usart_transmit_chars_dma(struct uart_port *port)
{
struct stm32_port *stm32port = to_stm32_port(port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
struct dma_async_tx_descriptor *desc = NULL;
unsigned int count;
int ret;
@@ -728,25 +733,8 @@ static void stm32_usart_transmit_chars_dma(struct uart_port *port)
return;
}
- count = uart_circ_chars_pending(xmit);
-
- if (count > TX_BUF_L)
- count = TX_BUF_L;
-
- if (xmit->tail < xmit->head) {
- memcpy(&stm32port->tx_buf[0], &xmit->buf[xmit->tail], count);
- } else {
- size_t one = UART_XMIT_SIZE - xmit->tail;
- size_t two;
-
- if (one > count)
- one = count;
- two = count - one;
-
- memcpy(&stm32port->tx_buf[0], &xmit->buf[xmit->tail], one);
- if (two)
- memcpy(&stm32port->tx_buf[one], &xmit->buf[0], two);
- }
+ count = kfifo_out_peek(&tport->xmit_fifo, &stm32port->tx_buf[0],
+ TX_BUF_L);
desc = dmaengine_prep_slave_single(stm32port->tx_ch,
stm32port->tx_dma_buf,
@@ -792,14 +780,14 @@ static void stm32_usart_transmit_chars(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
u32 isr;
int ret;
if (!stm32_port->hw_flow_control &&
port->rs485.flags & SER_RS485_ENABLED &&
(port->x_char ||
- !(uart_circ_empty(xmit) || uart_tx_stopped(port)))) {
+ !(kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)))) {
stm32_usart_tc_interrupt_disable(port);
stm32_usart_rs485_rts_enable(port);
}
@@ -826,7 +814,7 @@ static void stm32_usart_transmit_chars(struct uart_port *port)
return;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
stm32_usart_tx_interrupt_disable(port);
return;
}
@@ -841,10 +829,10 @@ static void stm32_usart_transmit_chars(struct uart_port *port)
else
stm32_usart_transmit_chars_pio(port);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit)) {
+ if (kfifo_is_empty(&tport->xmit_fifo)) {
stm32_usart_tx_interrupt_disable(port);
if (!stm32_port->hw_flow_control &&
port->rs485.flags & SER_RS485_ENABLED) {
@@ -975,9 +963,9 @@ static void stm32_usart_stop_tx(struct uart_port *port)
/* There are probably characters waiting to be transmitted. */
static void stm32_usart_start_tx(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
- if (uart_circ_empty(xmit) && !port->x_char) {
+ if (kfifo_is_empty(&tport->xmit_fifo) && !port->x_char) {
stm32_usart_rs485_rts_disable(port);
return;
}
diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c
index 8d612ab80680..7f60679fdde1 100644
--- a/drivers/tty/serial/sunhv.c
+++ b/drivers/tty/serial/sunhv.c
@@ -39,10 +39,13 @@ static char *con_read_page;
static int hung_up = 0;
-static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit)
+static void transmit_chars_putchar(struct uart_port *port,
+ struct tty_port *tport)
{
- while (!uart_circ_empty(xmit)) {
- long status = sun4v_con_putchar(xmit->buf[xmit->tail]);
+ unsigned char ch;
+
+ while (kfifo_peek(&tport->xmit_fifo, &ch)) {
+ long status = sun4v_con_putchar(ch);
if (status != HV_EOK)
break;
@@ -51,14 +54,16 @@ static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit
}
}
-static void transmit_chars_write(struct uart_port *port, struct circ_buf *xmit)
+static void transmit_chars_write(struct uart_port *port, struct tty_port *tport)
{
- while (!uart_circ_empty(xmit)) {
- unsigned long ra = __pa(xmit->buf + xmit->tail);
- unsigned long len, status, sent;
+ while (!kfifo_is_empty(&tport->xmit_fifo)) {
+ unsigned long len, ra, status, sent;
+ unsigned char *tail;
+
+ len = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail,
+ UART_XMIT_SIZE);
+ ra = __pa(tail);
- len = CIRC_CNT_TO_END(xmit->head, xmit->tail,
- UART_XMIT_SIZE);
status = sun4v_con_write(ra, len, &sent);
if (status != HV_EOK)
break;
@@ -165,7 +170,7 @@ static int receive_chars_read(struct uart_port *port)
}
struct sunhv_ops {
- void (*transmit_chars)(struct uart_port *port, struct circ_buf *xmit);
+ void (*transmit_chars)(struct uart_port *port, struct tty_port *tport);
int (*receive_chars)(struct uart_port *port);
};
@@ -196,18 +201,18 @@ static struct tty_port *receive_chars(struct uart_port *port)
static void transmit_chars(struct uart_port *port)
{
- struct circ_buf *xmit;
+ struct tty_port *tport;
if (!port->state)
return;
- xmit = &port->state->xmit;
- if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+ tport = &port->state->port;
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port))
return;
- sunhv_ops->transmit_chars(port, xmit);
+ sunhv_ops->transmit_chars(port, tport);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
diff --git a/drivers/tty/serial/sunplus-uart.c b/drivers/tty/serial/sunplus-uart.c
index f5e29eb4a4ce..abf7c449308d 100644
--- a/drivers/tty/serial/sunplus-uart.c
+++ b/drivers/tty/serial/sunplus-uart.c
@@ -200,7 +200,7 @@ static void sunplus_break_ctl(struct uart_port *port, int ctl)
static void transmit_chars(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
if (port->x_char) {
sp_uart_put_char(port, port->x_char);
@@ -209,22 +209,24 @@ static void transmit_chars(struct uart_port *port)
return;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
sunplus_stop_tx(port);
return;
}
do {
- sp_uart_put_char(port, xmit->buf[xmit->tail]);
- uart_xmit_advance(port, 1);
- if (uart_circ_empty(xmit))
+ unsigned char ch;
+
+ if (!uart_fifo_get(port, &ch))
break;
+
+ sp_uart_put_char(port, ch);
} while (sunplus_tx_buf_not_full(port));
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
sunplus_stop_tx(port);
}
diff --git a/drivers/tty/serial/sunsab.c b/drivers/tty/serial/sunsab.c
index 1ea2f33a07a7..1acbe2fba746 100644
--- a/drivers/tty/serial/sunsab.c
+++ b/drivers/tty/serial/sunsab.c
@@ -232,7 +232,7 @@ static void sunsab_tx_idle(struct uart_sunsab_port *);
static void transmit_chars(struct uart_sunsab_port *up,
union sab82532_irq_status *stat)
{
- struct circ_buf *xmit = &up->port.state->xmit;
+ struct tty_port *tport = &up->port.state->port;
int i;
if (stat->sreg.isr1 & SAB82532_ISR1_ALLS) {
@@ -252,7 +252,7 @@ static void transmit_chars(struct uart_sunsab_port *up,
set_bit(SAB82532_XPR, &up->irqflags);
sunsab_tx_idle(up);
- if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(&up->port)) {
up->interrupt_mask1 |= SAB82532_IMR1_XPR;
writeb(up->interrupt_mask1, &up->regs->w.imr1);
return;
@@ -265,21 +265,22 @@ static void transmit_chars(struct uart_sunsab_port *up,
/* Stuff 32 bytes into Transmit FIFO. */
clear_bit(SAB82532_XPR, &up->irqflags);
for (i = 0; i < up->port.fifosize; i++) {
- writeb(xmit->buf[xmit->tail],
- &up->regs->w.xfifo[i]);
- uart_xmit_advance(&up->port, 1);
- if (uart_circ_empty(xmit))
+ unsigned char ch;
+
+ if (!uart_fifo_get(&up->port, &ch))
break;
+
+ writeb(ch, &up->regs->w.xfifo[i]);
}
/* Issue a Transmit Frame command. */
sunsab_cec_wait(up);
writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
sunsab_stop_tx(&up->port);
}
@@ -435,10 +436,10 @@ static void sunsab_start_tx(struct uart_port *port)
{
struct uart_sunsab_port *up =
container_of(port, struct uart_sunsab_port, port);
- struct circ_buf *xmit = &up->port.state->xmit;
+ struct tty_port *tport = &up->port.state->port;
int i;
- if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port))
return;
up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
@@ -451,11 +452,12 @@ static void sunsab_start_tx(struct uart_port *port)
clear_bit(SAB82532_XPR, &up->irqflags);
for (i = 0; i < up->port.fifosize; i++) {
- writeb(xmit->buf[xmit->tail],
- &up->regs->w.xfifo[i]);
- uart_xmit_advance(&up->port, 1);
- if (uart_circ_empty(xmit))
+ unsigned char ch;
+
+ if (!uart_fifo_get(&up->port, &ch))
break;
+
+ writeb(ch, &up->regs->w.xfifo[i]);
}
/* Issue a Transmit Frame command. */
diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c
index c8b65f4b2710..67a5fc70bb4b 100644
--- a/drivers/tty/serial/sunsu.c
+++ b/drivers/tty/serial/sunsu.c
@@ -396,7 +396,8 @@ receive_chars(struct uart_sunsu_port *up, unsigned char *status)
static void transmit_chars(struct uart_sunsu_port *up)
{
- struct circ_buf *xmit = &up->port.state->xmit;
+ struct tty_port *tport = &up->port.state->port;
+ unsigned char ch;
int count;
if (up->port.x_char) {
@@ -409,23 +410,23 @@ static void transmit_chars(struct uart_sunsu_port *up)
sunsu_stop_tx(&up->port);
return;
}
- if (uart_circ_empty(xmit)) {
+ if (kfifo_is_empty(&tport->xmit_fifo)) {
__stop_tx(up);
return;
}
count = up->port.fifosize;
do {
- serial_out(up, UART_TX, xmit->buf[xmit->tail]);
- uart_xmit_advance(&up->port, 1);
- if (uart_circ_empty(xmit))
+ if (!uart_fifo_get(&up->port, &ch))
break;
+
+ serial_out(up, UART_TX, ch);
} while (--count > 0);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
__stop_tx(up);
}
diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
index c99289c6c8f8..71758ad4241c 100644
--- a/drivers/tty/serial/sunzilog.c
+++ b/drivers/tty/serial/sunzilog.c
@@ -453,7 +453,8 @@ static void sunzilog_status_handle(struct uart_sunzilog_port *up,
static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
struct zilog_channel __iomem *channel)
{
- struct circ_buf *xmit;
+ struct tty_port *tport;
+ unsigned char ch;
if (ZS_IS_CONS(up)) {
unsigned char status = readb(&channel->control);
@@ -496,21 +497,20 @@ static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
if (up->port.state == NULL)
goto ack_tx_int;
- xmit = &up->port.state->xmit;
- if (uart_circ_empty(xmit))
- goto ack_tx_int;
+ tport = &up->port.state->port;
if (uart_tx_stopped(&up->port))
goto ack_tx_int;
+ if (!uart_fifo_get(&up->port, &ch))
+ goto ack_tx_int;
+
up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
- writeb(xmit->buf[xmit->tail], &channel->data);
+ writeb(ch, &channel->data);
ZSDELAY();
ZS_WSYNC(channel);
- uart_xmit_advance(&up->port, 1);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
return;
@@ -700,17 +700,16 @@ static void sunzilog_start_tx(struct uart_port *port)
port->icount.tx++;
port->x_char = 0;
} else {
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
+ unsigned char ch;
- if (uart_circ_empty(xmit))
+ if (!uart_fifo_get(&up->port, &ch))
return;
- writeb(xmit->buf[xmit->tail], &channel->data);
+ writeb(ch, &channel->data);
ZSDELAY();
ZS_WSYNC(channel);
- uart_xmit_advance(port, 1);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
}
}
diff --git a/drivers/tty/serial/tegra-tcu.c b/drivers/tty/serial/tegra-tcu.c
index d9c78320eb02..21ca5fcadf49 100644
--- a/drivers/tty/serial/tegra-tcu.c
+++ b/drivers/tty/serial/tegra-tcu.c
@@ -91,15 +91,17 @@ static void tegra_tcu_write(struct tegra_tcu *tcu, const char *s,
static void tegra_tcu_uart_start_tx(struct uart_port *port)
{
struct tegra_tcu *tcu = port->private_data;
- struct circ_buf *xmit = &port->state->xmit;
- unsigned long count;
+ struct tty_port *tport = &port->state->port;
+ unsigned char *tail;
+ unsigned int count;
for (;;) {
- count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ count = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail,
+ UART_XMIT_SIZE);
if (!count)
break;
- tegra_tcu_write(tcu, &xmit->buf[xmit->tail], count);
+ tegra_tcu_write(tcu, tail, count);
uart_xmit_advance(port, count);
}
diff --git a/drivers/tty/serial/timbuart.c b/drivers/tty/serial/timbuart.c
index 4bc89a9b380a..43fa0938b5e3 100644
--- a/drivers/tty/serial/timbuart.c
+++ b/drivers/tty/serial/timbuart.c
@@ -95,14 +95,11 @@ static void timbuart_rx_chars(struct uart_port *port)
static void timbuart_tx_chars(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
+ unsigned char ch;
while (!(ioread32(port->membase + TIMBUART_ISR) & TXBF) &&
- !uart_circ_empty(xmit)) {
- iowrite8(xmit->buf[xmit->tail],
- port->membase + TIMBUART_TXFIFO);
- uart_xmit_advance(port, 1);
- }
+ uart_fifo_get(port, &ch))
+ iowrite8(ch, port->membase + TIMBUART_TXFIFO);
dev_dbg(port->dev,
"%s - total written %d bytes, CTL: %x, RTS: %x, baud: %x\n",
@@ -117,9 +114,9 @@ static void timbuart_handle_tx_port(struct uart_port *port, u32 isr, u32 *ier)
{
struct timbuart_port *uart =
container_of(port, struct timbuart_port, port);
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
- if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port))
return;
if (port->x_char)
@@ -130,7 +127,7 @@ static void timbuart_handle_tx_port(struct uart_port *port, u32 isr, u32 *ier)
/* clear all TX interrupts */
iowrite32(TXFLAGS, port->membase + TIMBUART_ISR);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
} else
/* Re-enable any tx interrupt */
@@ -141,7 +138,7 @@ static void timbuart_handle_tx_port(struct uart_port *port, u32 isr, u32 *ier)
* we wake up the upper layer later when we got the interrupt
* to give it some time to go out...
*/
- if (!uart_circ_empty(xmit))
+ if (!kfifo_is_empty(&tport->xmit_fifo))
*ier |= TXBAE;
dev_dbg(port->dev, "%s - leaving\n", __func__);
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index 10ba41b7be99..68357ac8ffe3 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -189,7 +189,8 @@ static int ulite_receive(struct uart_port *port, int stat)
static int ulite_transmit(struct uart_port *port, int stat)
{
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
+ unsigned char ch;
if (stat & ULITE_STATUS_TXFULL)
return 0;
@@ -201,14 +202,16 @@ static int ulite_transmit(struct uart_port *port, int stat)
return 1;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+ if (uart_tx_stopped(port))
+ return 0;
+
+ if (!uart_fifo_get(port, &ch))
return 0;
- uart_out32(xmit->buf[xmit->tail], ULITE_TX, port);
- uart_xmit_advance(port, 1);
+ uart_out32(ch, ULITE_TX, port);
/* wake up */
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
return 1;
diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c
index 397b95dff7ed..53bb8c5ef499 100644
--- a/drivers/tty/serial/ucc_uart.c
+++ b/drivers/tty/serial/ucc_uart.c
@@ -334,7 +334,7 @@ static int qe_uart_tx_pump(struct uart_qe_port *qe_port)
unsigned char *p;
unsigned int count;
struct uart_port *port = &qe_port->port;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
/* Handle xon/xoff */
if (port->x_char) {
@@ -358,7 +358,7 @@ static int qe_uart_tx_pump(struct uart_qe_port *qe_port)
return 1;
}
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
qe_uart_stop_tx(port);
return 0;
}
@@ -366,16 +366,10 @@ static int qe_uart_tx_pump(struct uart_qe_port *qe_port)
/* Pick next descriptor and fill from buffer */
bdp = qe_port->tx_cur;
- while (!(ioread16be(&bdp->status) & BD_SC_READY) && !uart_circ_empty(xmit)) {
- count = 0;
+ while (!(ioread16be(&bdp->status) & BD_SC_READY) &&
+ !kfifo_is_empty(&tport->xmit_fifo)) {
p = qe2cpu_addr(ioread32be(&bdp->buf), qe_port);
- while (count < qe_port->tx_fifosize) {
- *p++ = xmit->buf[xmit->tail];
- uart_xmit_advance(port, 1);
- count++;
- if (uart_circ_empty(xmit))
- break;
- }
+ count = uart_fifo_out(port, p, qe_port->tx_fifosize);
iowrite16be(count, &bdp->length);
qe_setbits_be16(&bdp->status, BD_SC_READY);
@@ -388,10 +382,10 @@ static int qe_uart_tx_pump(struct uart_qe_port *qe_port)
}
qe_port->tx_cur = bdp;
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
- if (uart_circ_empty(xmit)) {
+ if (kfifo_is_empty(&tport->xmit_fifo)) {
/* The kernel buffer is empty, so turn off TX interrupts. We
don't need to be told when the QE is finished transmitting
the data. */
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 5f48ec37cb25..2acfcea403ce 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -25,6 +25,7 @@
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
+#include <linux/reset.h>
#define CDNS_UART_TTY_NAME "ttyPS"
#define CDNS_UART_NAME "xuartps"
@@ -198,6 +199,7 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
* @gpiod_rts: Pointer to the gpio descriptor
* @rs485_tx_started: RS485 tx state
* @tx_timer: Timer for tx
+ * @rstc: Pointer to the reset control
*/
struct cdns_uart {
struct uart_port *port;
@@ -211,6 +213,7 @@ struct cdns_uart {
struct gpio_desc *gpiod_rts;
bool rs485_tx_started;
struct hrtimer tx_timer;
+ struct reset_control *rstc;
};
struct cdns_platform_data {
u32 quirks;
@@ -425,32 +428,32 @@ static void cdns_uart_handle_tx(void *dev_id)
{
struct uart_port *port = (struct uart_port *)dev_id;
struct cdns_uart *cdns_uart = port->private_data;
- struct circ_buf *xmit = &port->state->xmit;
+ struct tty_port *tport = &port->state->port;
unsigned int numbytes;
+ unsigned char ch;
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
/* Disable the TX Empty interrupt */
writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IDR);
return;
}
numbytes = port->fifosize;
- while (numbytes && !uart_circ_empty(xmit) &&
- !(readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL)) {
-
- writel(xmit->buf[xmit->tail], port->membase + CDNS_UART_FIFO);
- uart_xmit_advance(port, 1);
+ while (numbytes &&
+ !(readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL) &&
+ uart_fifo_get(port, &ch)) {
+ writel(ch, port->membase + CDNS_UART_FIFO);
numbytes--;
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
/* Enable the TX Empty interrupt */
writel(CDNS_UART_IXR_TXEMPTY, cdns_uart->port->membase + CDNS_UART_IER);
if (cdns_uart->port->rs485.flags & SER_RS485_ENABLED &&
- (uart_circ_empty(xmit) || uart_tx_stopped(port))) {
+ (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port))) {
cdns_uart->tx_timer.function = &cdns_rs485_rx_callback;
hrtimer_start(&cdns_uart->tx_timer,
ns_to_ktime(cdns_calc_after_tx_delay(cdns_uart)), HRTIMER_MODE_REL);
@@ -723,7 +726,7 @@ static void cdns_uart_start_tx(struct uart_port *port)
status |= CDNS_UART_CR_TX_EN;
writel(status, port->membase + CDNS_UART_CR);
- if (uart_circ_empty(&port->state->xmit))
+ if (kfifo_is_empty(&port->state->port.xmit_fifo))
return;
/* Clear the TX Empty interrupt */
@@ -948,6 +951,10 @@ static int cdns_uart_startup(struct uart_port *port)
is_brk_support = cdns_uart->quirks & CDNS_UART_RXBS_SUPPORT;
+ ret = reset_control_deassert(cdns_uart->rstc);
+ if (ret)
+ return ret;
+
uart_port_lock_irqsave(port, &flags);
/* Disable the TX and RX */
@@ -1721,6 +1728,13 @@ static int cdns_uart_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
}
+ cdns_uart_data->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(cdns_uart_data->rstc)) {
+ rc = PTR_ERR(cdns_uart_data->rstc);
+ dev_err_probe(&pdev->dev, rc, "Cannot get UART reset\n");
+ goto err_out_unregister_driver;
+ }
+
rc = clk_prepare_enable(cdns_uart_data->pclk);
if (rc) {
dev_err(&pdev->dev, "Unable to enable pclk clock.\n");
@@ -1881,6 +1895,7 @@ static void cdns_uart_remove(struct platform_device *pdev)
if (console_port == port)
console_port = NULL;
#endif
+ reset_control_assert(cdns_uart_data->rstc);
if (!--instances)
uart_unregister_driver(cdns_uart_data->cdns_uart_driver);
diff --git a/drivers/tty/serial/zs.c b/drivers/tty/serial/zs.c
index 65ca4da6e368..79ea7108a0f3 100644
--- a/drivers/tty/serial/zs.c
+++ b/drivers/tty/serial/zs.c
@@ -606,7 +606,8 @@ static void zs_receive_chars(struct zs_port *zport)
static void zs_raw_transmit_chars(struct zs_port *zport)
{
- struct circ_buf *xmit = &zport->port.state->xmit;
+ struct tty_port *tport = &zport->port.state->port;
+ unsigned char ch;
/* XON/XOFF chars. */
if (zport->port.x_char) {
@@ -617,20 +618,20 @@ static void zs_raw_transmit_chars(struct zs_port *zport)
}
/* If nothing to do or stopped or hardware stopped. */
- if (uart_circ_empty(xmit) || uart_tx_stopped(&zport->port)) {
+ if (uart_tx_stopped(&zport->port) ||
+ !uart_fifo_get(&zport->port, &ch)) {
zs_raw_stop_tx(zport);
return;
}
/* Send char. */
- write_zsdata(zport, xmit->buf[xmit->tail]);
- uart_xmit_advance(&zport->port, 1);
+ write_zsdata(zport, ch);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(&zport->port);
/* Are we are done? */
- if (uart_circ_empty(xmit))
+ if (kfifo_is_empty(&tport->xmit_fifo))
zs_raw_stop_tx(zport);
}