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-rw-r--r--drivers/tty/serial/8250/8250.h5
-rw-r--r--drivers/tty/serial/8250/8250_core.c2
-rw-r--r--drivers/tty/serial/8250/8250_dma.c14
-rw-r--r--drivers/tty/serial/8250/8250_dw.c63
-rw-r--r--drivers/tty/serial/8250/8250_lpss.c378
-rw-r--r--drivers/tty/serial/8250/8250_mid.c8
-rw-r--r--drivers/tty/serial/8250/8250_mtk.c6
-rw-r--r--drivers/tty/serial/8250/8250_of.c7
-rw-r--r--drivers/tty/serial/8250/8250_pci.c312
-rw-r--r--drivers/tty/serial/8250/8250_port.c81
-rw-r--r--drivers/tty/serial/8250/Kconfig16
-rw-r--r--drivers/tty/serial/8250/Makefile1
-rw-r--r--drivers/tty/serial/Kconfig2
-rw-r--r--drivers/tty/serial/altera_jtaguart.c2
-rw-r--r--drivers/tty/serial/altera_uart.c2
-rw-r--r--drivers/tty/serial/amba-pl011.c57
-rw-r--r--drivers/tty/serial/arc_uart.c2
-rw-r--r--drivers/tty/serial/atmel_serial.c58
-rw-r--r--drivers/tty/serial/bcm63xx_uart.c2
-rw-r--r--drivers/tty/serial/earlycon-arm-semihost.c3
-rw-r--r--drivers/tty/serial/earlycon.c26
-rw-r--r--drivers/tty/serial/fsl_lpuart.c814
-rw-r--r--drivers/tty/serial/imx.c213
-rw-r--r--drivers/tty/serial/jsm/jsm_tty.c2
-rw-r--r--drivers/tty/serial/max3100.c2
-rw-r--r--drivers/tty/serial/max310x.c2
-rw-r--r--drivers/tty/serial/men_z135_uart.c2
-rw-r--r--drivers/tty/serial/mxs-auart.c15
-rw-r--r--drivers/tty/serial/pch_uart.c7
-rw-r--r--drivers/tty/serial/samsung.c2
-rw-r--r--drivers/tty/serial/samsung.h2
-rw-r--r--drivers/tty/serial/sc16is7xx.c20
-rw-r--r--drivers/tty/serial/serial_core.c136
-rw-r--r--drivers/tty/serial/sh-sci.c2
-rw-r--r--drivers/tty/serial/st-asc.c2
-rw-r--r--drivers/tty/serial/stm32-usart.c613
-rw-r--r--drivers/tty/serial/stm32-usart.h229
-rw-r--r--drivers/tty/serial/timbuart.c2
-rw-r--r--drivers/tty/serial/uartlite.c2
-rw-r--r--drivers/tty/serial/vt8500_serial.c8
-rw-r--r--drivers/tty/serial/xilinx_uartps.c304
41 files changed, 2288 insertions, 1138 deletions
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
index 1a16feac9a36..a697a8585ddc 100644
--- a/drivers/tty/serial/8250/8250.h
+++ b/drivers/tty/serial/8250/8250.h
@@ -31,6 +31,11 @@ struct uart_8250_dma {
struct dma_chan *rxchan;
struct dma_chan *txchan;
+ /* Device address base for DMA operations */
+ phys_addr_t rx_dma_addr;
+ phys_addr_t tx_dma_addr;
+
+ /* DMA address of the buffer in memory */
dma_addr_t rx_addr;
dma_addr_t tx_addr;
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index dcf43f66404f..240a361b674f 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -639,7 +639,7 @@ static int univ8250_console_match(struct console *co, char *name, int idx,
{
char match[] = "uart"; /* 8250-specific earlycon name */
unsigned char iotype;
- unsigned long addr;
+ resource_size_t addr;
int i;
if (strncmp(name, match, 4) != 0)
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index 3590d012001f..fdbddbc6375d 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -142,7 +142,7 @@ void serial8250_rx_dma_flush(struct uart_8250_port *p)
if (dma->rx_running) {
dmaengine_pause(dma->rxchan);
__dma_rx_complete(p);
- dmaengine_terminate_all(dma->rxchan);
+ dmaengine_terminate_async(dma->rxchan);
}
}
EXPORT_SYMBOL_GPL(serial8250_rx_dma_flush);
@@ -150,6 +150,10 @@ EXPORT_SYMBOL_GPL(serial8250_rx_dma_flush);
int serial8250_request_dma(struct uart_8250_port *p)
{
struct uart_8250_dma *dma = p->dma;
+ phys_addr_t rx_dma_addr = dma->rx_dma_addr ?
+ dma->rx_dma_addr : p->port.mapbase;
+ phys_addr_t tx_dma_addr = dma->tx_dma_addr ?
+ dma->tx_dma_addr : p->port.mapbase;
dma_cap_mask_t mask;
struct dma_slave_caps caps;
int ret;
@@ -157,11 +161,11 @@ int serial8250_request_dma(struct uart_8250_port *p)
/* Default slave configuration parameters */
dma->rxconf.direction = DMA_DEV_TO_MEM;
dma->rxconf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- dma->rxconf.src_addr = p->port.mapbase + UART_RX;
+ dma->rxconf.src_addr = rx_dma_addr + UART_RX;
dma->txconf.direction = DMA_MEM_TO_DEV;
dma->txconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- dma->txconf.dst_addr = p->port.mapbase + UART_TX;
+ dma->txconf.dst_addr = tx_dma_addr + UART_TX;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
@@ -247,14 +251,14 @@ void serial8250_release_dma(struct uart_8250_port *p)
return;
/* Release RX resources */
- dmaengine_terminate_all(dma->rxchan);
+ dmaengine_terminate_sync(dma->rxchan);
dma_free_coherent(dma->rxchan->device->dev, dma->rx_size, dma->rx_buf,
dma->rx_addr);
dma_release_channel(dma->rxchan);
dma->rxchan = NULL;
/* Release TX resources */
- dmaengine_terminate_all(dma->txchan);
+ dmaengine_terminate_sync(dma->txchan);
dma_unmap_single(dma->txchan->device->dev, dma->tx_addr,
UART_XMIT_SIZE, DMA_TO_DEVICE);
dma_release_channel(dma->txchan);
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index e19969614203..459d726f9d59 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -298,12 +298,17 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
p->serial_out = dw8250_serial_out32be;
}
} else if (has_acpi_companion(p->dev)) {
- p->iotype = UPIO_MEM32;
- p->regshift = 2;
- p->serial_in = dw8250_serial_in32;
+ const struct acpi_device_id *id;
+
+ id = acpi_match_device(p->dev->driver->acpi_match_table,
+ p->dev);
+ if (id && !strcmp(id->id, "APMC0D08")) {
+ p->iotype = UPIO_MEM32;
+ p->regshift = 2;
+ p->serial_in = dw8250_serial_in32;
+ data->uart_16550_compatible = true;
+ }
p->set_termios = dw8250_set_termios;
- /* So far none of there implement the Busy Functionality */
- data->uart_16550_compatible = true;
}
/* Platforms with iDMA */
@@ -360,18 +365,19 @@ static int dw8250_probe(struct platform_device *pdev)
struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
int irq = platform_get_irq(pdev, 0);
struct uart_port *p = &uart.port;
+ struct device *dev = &pdev->dev;
struct dw8250_data *data;
int err;
u32 val;
if (!regs) {
- dev_err(&pdev->dev, "no registers defined\n");
+ dev_err(dev, "no registers defined\n");
return -EINVAL;
}
if (irq < 0) {
if (irq != -EPROBE_DEFER)
- dev_err(&pdev->dev, "cannot get irq\n");
+ dev_err(dev, "cannot get irq\n");
return irq;
}
@@ -382,16 +388,16 @@ static int dw8250_probe(struct platform_device *pdev)
p->pm = dw8250_do_pm;
p->type = PORT_8250;
p->flags = UPF_SHARE_IRQ | UPF_FIXED_PORT;
- p->dev = &pdev->dev;
+ p->dev = dev;
p->iotype = UPIO_MEM;
p->serial_in = dw8250_serial_in;
p->serial_out = dw8250_serial_out;
- p->membase = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
+ p->membase = devm_ioremap(dev, regs->start, resource_size(regs));
if (!p->membase)
return -ENOMEM;
- data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
@@ -399,57 +405,57 @@ static int dw8250_probe(struct platform_device *pdev)
data->usr_reg = DW_UART_USR;
p->private_data = data;
- data->uart_16550_compatible = device_property_read_bool(p->dev,
+ data->uart_16550_compatible = device_property_read_bool(dev,
"snps,uart-16550-compatible");
- err = device_property_read_u32(p->dev, "reg-shift", &val);
+ err = device_property_read_u32(dev, "reg-shift", &val);
if (!err)
p->regshift = val;
- err = device_property_read_u32(p->dev, "reg-io-width", &val);
+ err = device_property_read_u32(dev, "reg-io-width", &val);
if (!err && val == 4) {
p->iotype = UPIO_MEM32;
p->serial_in = dw8250_serial_in32;
p->serial_out = dw8250_serial_out32;
}
- if (device_property_read_bool(p->dev, "dcd-override")) {
+ if (device_property_read_bool(dev, "dcd-override")) {
/* Always report DCD as active */
data->msr_mask_on |= UART_MSR_DCD;
data->msr_mask_off |= UART_MSR_DDCD;
}
- if (device_property_read_bool(p->dev, "dsr-override")) {
+ if (device_property_read_bool(dev, "dsr-override")) {
/* Always report DSR as active */
data->msr_mask_on |= UART_MSR_DSR;
data->msr_mask_off |= UART_MSR_DDSR;
}
- if (device_property_read_bool(p->dev, "cts-override")) {
+ if (device_property_read_bool(dev, "cts-override")) {
/* Always report CTS as active */
data->msr_mask_on |= UART_MSR_CTS;
data->msr_mask_off |= UART_MSR_DCTS;
}
- if (device_property_read_bool(p->dev, "ri-override")) {
+ if (device_property_read_bool(dev, "ri-override")) {
/* Always report Ring indicator as inactive */
data->msr_mask_off |= UART_MSR_RI;
data->msr_mask_off |= UART_MSR_TERI;
}
/* Always ask for fixed clock rate from a property. */
- device_property_read_u32(p->dev, "clock-frequency", &p->uartclk);
+ device_property_read_u32(dev, "clock-frequency", &p->uartclk);
/* If there is separate baudclk, get the rate from it. */
- data->clk = devm_clk_get(&pdev->dev, "baudclk");
+ data->clk = devm_clk_get(dev, "baudclk");
if (IS_ERR(data->clk) && PTR_ERR(data->clk) != -EPROBE_DEFER)
- data->clk = devm_clk_get(&pdev->dev, NULL);
+ data->clk = devm_clk_get(dev, NULL);
if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (!IS_ERR_OR_NULL(data->clk)) {
err = clk_prepare_enable(data->clk);
if (err)
- dev_warn(&pdev->dev, "could not enable optional baudclk: %d\n",
+ dev_warn(dev, "could not enable optional baudclk: %d\n",
err);
else
p->uartclk = clk_get_rate(data->clk);
@@ -457,24 +463,24 @@ static int dw8250_probe(struct platform_device *pdev)
/* If no clock rate is defined, fail. */
if (!p->uartclk) {
- dev_err(&pdev->dev, "clock rate not defined\n");
+ dev_err(dev, "clock rate not defined\n");
return -EINVAL;
}
- data->pclk = devm_clk_get(&pdev->dev, "apb_pclk");
- if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER) {
+ data->pclk = devm_clk_get(dev, "apb_pclk");
+ if (IS_ERR(data->pclk) && PTR_ERR(data->pclk) == -EPROBE_DEFER) {
err = -EPROBE_DEFER;
goto err_clk;
}
if (!IS_ERR(data->pclk)) {
err = clk_prepare_enable(data->pclk);
if (err) {
- dev_err(&pdev->dev, "could not enable apb_pclk\n");
+ dev_err(dev, "could not enable apb_pclk\n");
goto err_clk;
}
}
- data->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
+ data->rst = devm_reset_control_get_optional(dev, NULL);
if (IS_ERR(data->rst) && PTR_ERR(data->rst) == -EPROBE_DEFER) {
err = -EPROBE_DEFER;
goto err_pclk;
@@ -506,8 +512,8 @@ static int dw8250_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, data);
- pm_runtime_set_active(&pdev->dev);
- pm_runtime_enable(&pdev->dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
return 0;
@@ -619,6 +625,7 @@ static const struct acpi_device_id dw8250_acpi_match[] = {
{ "APMC0D08", 0},
{ "AMD0020", 0 },
{ "AMDI0020", 0 },
+ { "HISI0031", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match);
diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c
new file mode 100644
index 000000000000..886fcf37f291
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_lpss.c
@@ -0,0 +1,378 @@
+/*
+ * 8250_lpss.c - Driver for UART on Intel Braswell and various other Intel SoCs
+ *
+ * Copyright (C) 2016 Intel Corporation
+ * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/rational.h>
+
+#include <linux/dmaengine.h>
+#include <linux/dma/dw.h>
+
+#include "8250.h"
+
+#define PCI_DEVICE_ID_INTEL_QRK_UARTx 0x0936
+
+#define PCI_DEVICE_ID_INTEL_BYT_UART1 0x0f0a
+#define PCI_DEVICE_ID_INTEL_BYT_UART2 0x0f0c
+
+#define PCI_DEVICE_ID_INTEL_BSW_UART1 0x228a
+#define PCI_DEVICE_ID_INTEL_BSW_UART2 0x228c
+
+#define PCI_DEVICE_ID_INTEL_BDW_UART1 0x9ce3
+#define PCI_DEVICE_ID_INTEL_BDW_UART2 0x9ce4
+
+/* Intel LPSS specific registers */
+
+#define BYT_PRV_CLK 0x800
+#define BYT_PRV_CLK_EN BIT(0)
+#define BYT_PRV_CLK_M_VAL_SHIFT 1
+#define BYT_PRV_CLK_N_VAL_SHIFT 16
+#define BYT_PRV_CLK_UPDATE BIT(31)
+
+#define BYT_TX_OVF_INT 0x820
+#define BYT_TX_OVF_INT_MASK BIT(1)
+
+struct lpss8250;
+
+struct lpss8250_board {
+ unsigned long freq;
+ unsigned int base_baud;
+ int (*setup)(struct lpss8250 *, struct uart_port *p);
+ void (*exit)(struct lpss8250 *);
+};
+
+struct lpss8250 {
+ int line;
+ struct lpss8250_board *board;
+
+ /* DMA parameters */
+ struct uart_8250_dma dma;
+ struct dw_dma_chip dma_chip;
+ struct dw_dma_slave dma_param;
+ u8 dma_maxburst;
+};
+
+static void byt_set_termios(struct uart_port *p, struct ktermios *termios,
+ struct ktermios *old)
+{
+ unsigned int baud = tty_termios_baud_rate(termios);
+ struct lpss8250 *lpss = p->private_data;
+ unsigned long fref = lpss->board->freq, fuart = baud * 16;
+ unsigned long w = BIT(15) - 1;
+ unsigned long m, n;
+ u32 reg;
+
+ /* Gracefully handle the B0 case: fall back to B9600 */
+ fuart = fuart ? fuart : 9600 * 16;
+
+ /* Get Fuart closer to Fref */
+ fuart *= rounddown_pow_of_two(fref / fuart);
+
+ /*
+ * For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the
+ * dividers must be adjusted.
+ *
+ * uartclk = (m / n) * 100 MHz, where m <= n
+ */
+ rational_best_approximation(fuart, fref, w, w, &m, &n);
+ p->uartclk = fuart;
+
+ /* Reset the clock */
+ reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT);
+ writel(reg, p->membase + BYT_PRV_CLK);
+ reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE;
+ writel(reg, p->membase + BYT_PRV_CLK);
+
+ p->status &= ~UPSTAT_AUTOCTS;
+ if (termios->c_cflag & CRTSCTS)
+ p->status |= UPSTAT_AUTOCTS;
+
+ serial8250_do_set_termios(p, termios, old);
+}
+
+static unsigned int byt_get_mctrl(struct uart_port *port)
+{
+ unsigned int ret = serial8250_do_get_mctrl(port);
+
+ /* Force DCD and DSR signals to permanently be reported as active */
+ ret |= TIOCM_CAR | TIOCM_DSR;
+
+ return ret;
+}
+
+static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
+{
+ struct dw_dma_slave *param = &lpss->dma_param;
+ struct uart_8250_port *up = up_to_u8250p(port);
+ struct pci_dev *pdev = to_pci_dev(port->dev);
+ unsigned int dma_devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
+ struct pci_dev *dma_dev = pci_get_slot(pdev->bus, dma_devfn);
+
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_BYT_UART1:
+ case PCI_DEVICE_ID_INTEL_BSW_UART1:
+ case PCI_DEVICE_ID_INTEL_BDW_UART1:
+ param->src_id = 3;
+ param->dst_id = 2;
+ break;
+ case PCI_DEVICE_ID_INTEL_BYT_UART2:
+ case PCI_DEVICE_ID_INTEL_BSW_UART2:
+ case PCI_DEVICE_ID_INTEL_BDW_UART2:
+ param->src_id = 5;
+ param->dst_id = 4;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ param->dma_dev = &dma_dev->dev;
+ param->m_master = 0;
+ param->p_master = 1;
+
+ /* TODO: Detect FIFO size automaticaly for DesignWare 8250 */
+ port->fifosize = 64;
+ up->tx_loadsz = 64;
+
+ lpss->dma_maxburst = 16;
+
+ port->set_termios = byt_set_termios;
+ port->get_mctrl = byt_get_mctrl;
+
+ /* Disable TX counter interrupts */
+ writel(BYT_TX_OVF_INT_MASK, port->membase + BYT_TX_OVF_INT);
+
+ return 0;
+}
+
+#ifdef CONFIG_SERIAL_8250_DMA
+static const struct dw_dma_platform_data qrk_serial_dma_pdata = {
+ .nr_channels = 2,
+ .is_private = true,
+ .is_nollp = true,
+ .chan_allocation_order = CHAN_ALLOCATION_ASCENDING,
+ .chan_priority = CHAN_PRIORITY_ASCENDING,
+ .block_size = 4095,
+ .nr_masters = 1,
+ .data_width = {4},
+};
+
+static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
+{
+ struct uart_8250_dma *dma = &lpss->dma;
+ struct dw_dma_chip *chip = &lpss->dma_chip;
+ struct dw_dma_slave *param = &lpss->dma_param;
+ struct pci_dev *pdev = to_pci_dev(port->dev);
+ int ret;
+
+ chip->dev = &pdev->dev;
+ chip->irq = pdev->irq;
+ chip->regs = pci_ioremap_bar(pdev, 1);
+ chip->pdata = &qrk_serial_dma_pdata;
+
+ /* Falling back to PIO mode if DMA probing fails */
+ ret = dw_dma_probe(chip);
+ if (ret)
+ return;
+
+ /* Special DMA address for UART */
+ dma->rx_dma_addr = 0xfffff000;
+ dma->tx_dma_addr = 0xfffff000;
+
+ param->dma_dev = &pdev->dev;
+ param->src_id = 0;
+ param->dst_id = 1;
+ param->hs_polarity = true;
+
+ lpss->dma_maxburst = 8;
+}
+
+static void qrk_serial_exit_dma(struct lpss8250 *lpss)
+{
+ struct dw_dma_slave *param = &lpss->dma_param;
+
+ if (!param->dma_dev)
+ return;
+ dw_dma_remove(&lpss->dma_chip);
+}
+#else /* CONFIG_SERIAL_8250_DMA */
+static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port) {}
+static void qrk_serial_exit_dma(struct lpss8250 *lpss) {}
+#endif /* !CONFIG_SERIAL_8250_DMA */
+
+static int qrk_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
+{
+ struct pci_dev *pdev = to_pci_dev(port->dev);
+ int ret;
+
+ ret = pci_alloc_irq_vectors(pdev, 1, 1, 0);
+ if (ret < 0)
+ return ret;
+
+ port->irq = pci_irq_vector(pdev, 0);
+
+ qrk_serial_setup_dma(lpss, port);
+ return 0;
+}
+
+static void qrk_serial_exit(struct lpss8250 *lpss)
+{
+ qrk_serial_exit_dma(lpss);
+}
+
+static bool lpss8250_dma_filter(struct dma_chan *chan, void *param)
+{
+ struct dw_dma_slave *dws = param;
+
+ if (dws->dma_dev != chan->device->dev)
+ return false;
+
+ chan->private = dws;
+ return true;
+}
+
+static int lpss8250_dma_setup(struct lpss8250 *lpss, struct uart_8250_port *port)
+{
+ struct uart_8250_dma *dma = &lpss->dma;
+ struct dw_dma_slave *rx_param, *tx_param;
+ struct device *dev = port->port.dev;
+
+ if (!lpss->dma_param.dma_dev)
+ return 0;
+
+ rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL);
+ if (!rx_param)
+ return -ENOMEM;
+
+ tx_param = devm_kzalloc(dev, sizeof(*tx_param), GFP_KERNEL);
+ if (!tx_param)
+ return -ENOMEM;
+
+ *rx_param = lpss->dma_param;
+ dma->rxconf.src_maxburst = lpss->dma_maxburst;
+
+ *tx_param = lpss->dma_param;
+ dma->txconf.dst_maxburst = lpss->dma_maxburst;
+
+ dma->fn = lpss8250_dma_filter;
+ dma->rx_param = rx_param;
+ dma->tx_param = tx_param;
+
+ port->dma = dma;
+ return 0;
+}
+
+static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct uart_8250_port uart;
+ struct lpss8250 *lpss;
+ int ret;
+
+ ret = pcim_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ pci_set_master(pdev);
+
+ lpss = devm_kzalloc(&pdev->dev, sizeof(*lpss), GFP_KERNEL);
+ if (!lpss)
+ return -ENOMEM;
+
+ lpss->board = (struct lpss8250_board *)id->driver_data;
+
+ memset(&uart, 0, sizeof(struct uart_8250_port));
+
+ uart.port.dev = &pdev->dev;
+ uart.port.irq = pdev->irq;
+ uart.port.private_data = lpss;
+ uart.port.type = PORT_16550A;
+ uart.port.iotype = UPIO_MEM;
+ uart.port.regshift = 2;
+ uart.port.uartclk = lpss->board->base_baud * 16;
+ uart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE;
+ uart.capabilities = UART_CAP_FIFO | UART_CAP_AFE;
+ uart.port.mapbase = pci_resource_start(pdev, 0);
+ uart.port.membase = pcim_iomap(pdev, 0, 0);
+ if (!uart.port.membase)
+ return -ENOMEM;
+
+ ret = lpss->board->setup(lpss, &uart.port);
+ if (ret)
+ return ret;
+
+ ret = lpss8250_dma_setup(lpss, &uart);
+ if (ret)
+ goto err_exit;
+
+ ret = serial8250_register_8250_port(&uart);
+ if (ret < 0)
+ goto err_exit;
+
+ lpss->line = ret;
+
+ pci_set_drvdata(pdev, lpss);
+ return 0;
+
+err_exit:
+ if (lpss->board->exit)
+ lpss->board->exit(lpss);
+ return ret;
+}
+
+static void lpss8250_remove(struct pci_dev *pdev)
+{
+ struct lpss8250 *lpss = pci_get_drvdata(pdev);
+
+ if (lpss->board->exit)
+ lpss->board->exit(lpss);
+
+ serial8250_unregister_port(lpss->line);
+}
+
+static const struct lpss8250_board byt_board = {
+ .freq = 100000000,
+ .base_baud = 2764800,
+ .setup = byt_serial_setup,
+};
+
+static const struct lpss8250_board qrk_board = {
+ .freq = 44236800,
+ .base_baud = 2764800,
+ .setup = qrk_serial_setup,
+ .exit = qrk_serial_exit,
+};
+
+#define LPSS_DEVICE(id, board) { PCI_VDEVICE(INTEL, id), (kernel_ulong_t)&board }
+
+static const struct pci_device_id pci_ids[] = {
+ LPSS_DEVICE(PCI_DEVICE_ID_INTEL_QRK_UARTx, qrk_board),
+ LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BYT_UART1, byt_board),
+ LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BYT_UART2, byt_board),
+ LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BSW_UART1, byt_board),
+ LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BSW_UART2, byt_board),
+ LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BDW_UART1, byt_board),
+ LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BDW_UART2, byt_board),
+ { },
+};
+MODULE_DEVICE_TABLE(pci, pci_ids);
+
+static struct pci_driver lpss8250_pci_driver = {
+ .name = "8250_lpss",
+ .id_table = pci_ids,
+ .probe = lpss8250_probe,
+ .remove = lpss8250_remove,
+};
+
+module_pci_driver(lpss8250_pci_driver);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Intel LPSS UART driver");
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c
index 20c5db2f4264..39c2324484dd 100644
--- a/drivers/tty/serial/8250/8250_mid.c
+++ b/drivers/tty/serial/8250/8250_mid.c
@@ -99,27 +99,27 @@ static int dnv_handle_irq(struct uart_port *p)
struct uart_8250_port *up = up_to_u8250p(p);
unsigned int fisr = serial_port_in(p, INTEL_MID_UART_DNV_FISR);
u32 status;
- int ret = IRQ_NONE;
+ int ret = 0;
int err;
if (fisr & BIT(2)) {
err = hsu_dma_get_status(&mid->dma_chip, 1, &status);
if (err > 0) {
serial8250_rx_dma_flush(up);
- ret |= IRQ_HANDLED;
+ ret |= 1;
} else if (err == 0)
ret |= hsu_dma_do_irq(&mid->dma_chip, 1, status);
}
if (fisr & BIT(1)) {
err = hsu_dma_get_status(&mid->dma_chip, 0, &status);
if (err > 0)
- ret |= IRQ_HANDLED;
+ ret |= 1;
else if (err == 0)
ret |= hsu_dma_do_irq(&mid->dma_chip, 0, status);
}
if (fisr & BIT(0))
ret |= serial8250_handle_irq(p, serial_port_in(p, UART_IIR));
- return ret;
+ return IRQ_RETVAL(ret);
}
#define DNV_DMA_CHAN_OFFSET 0x80
diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index 3611ec9bb4fa..ce0cc471bfc3 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -62,7 +62,7 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios,
*/
baud = uart_get_baud_rate(port, termios, old,
port->uartclk / 16 / 0xffff,
- port->uartclk / 16);
+ port->uartclk);
if (baud <= 115200) {
serial_port_out(port, UART_MTK_HIGHS, 0x0);
@@ -76,10 +76,6 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios,
quot = DIV_ROUND_UP(port->uartclk, 4 * baud);
} else {
serial_port_out(port, UART_MTK_HIGHS, 0x3);
-
- /* Set to highest baudrate supported */
- if (baud >= 1152000)
- baud = 921600;
quot = DIV_ROUND_UP(port->uartclk, 256 * baud);
}
diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 38963d7bcf84..7a8b5fc81a19 100644
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -195,6 +195,7 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
switch (port_type) {
case PORT_8250 ... PORT_MAX_8250:
{
+ u32 tx_threshold;
struct uart_8250_port port8250;
memset(&port8250, 0, sizeof(port8250));
port8250.port = port;
@@ -202,6 +203,12 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
if (port.fifosize)
port8250.capabilities = UART_CAP_FIFO;
+ /* Check for TX FIFO threshold & set tx_loadsz */
+ if ((of_property_read_u32(ofdev->dev.of_node, "tx-threshold",
+ &tx_threshold) == 0) &&
+ (tx_threshold < port.fifosize))
+ port8250.tx_loadsz = port.fifosize - tx_threshold;
+
if (of_property_read_bool(ofdev->dev.of_node,
"auto-flow-control"))
port8250.capabilities |= UART_CAP_AFE;
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index bc51b32b2774..b98c1578f45a 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -21,14 +21,10 @@
#include <linux/serial_core.h>
#include <linux/8250_pci.h>
#include <linux/bitops.h>
-#include <linux/rational.h>
#include <asm/byteorder.h>
#include <asm/io.h>
-#include <linux/dmaengine.h>
-#include <linux/platform_data/dma-dw.h>
-
#include "8250.h"
/*
@@ -1349,160 +1345,6 @@ ce4100_serial_setup(struct serial_private *priv,
return ret;
}
-#define PCI_DEVICE_ID_INTEL_BYT_UART1 0x0f0a
-#define PCI_DEVICE_ID_INTEL_BYT_UART2 0x0f0c
-
-#define PCI_DEVICE_ID_INTEL_BSW_UART1 0x228a
-#define PCI_DEVICE_ID_INTEL_BSW_UART2 0x228c
-
-#define PCI_DEVICE_ID_INTEL_BDW_UART1 0x9ce3
-#define PCI_DEVICE_ID_INTEL_BDW_UART2 0x9ce4
-
-#define BYT_PRV_CLK 0x800
-#define BYT_PRV_CLK_EN (1 << 0)
-#define BYT_PRV_CLK_M_VAL_SHIFT 1
-#define BYT_PRV_CLK_N_VAL_SHIFT 16
-#define BYT_PRV_CLK_UPDATE (1 << 31)
-
-#define BYT_TX_OVF_INT 0x820
-#define BYT_TX_OVF_INT_MASK (1 << 1)
-
-static void
-byt_set_termios(struct uart_port *p, struct ktermios *termios,
- struct ktermios *old)
-{
- unsigned int baud = tty_termios_baud_rate(termios);
- unsigned long fref = 100000000, fuart = baud * 16;
- unsigned long w = BIT(15) - 1;
- unsigned long m, n;
- u32 reg;
-
- /* Gracefully handle the B0 case: fall back to B9600 */
- fuart = fuart ? fuart : 9600 * 16;
-
- /* Get Fuart closer to Fref */
- fuart *= rounddown_pow_of_two(fref / fuart);
-
- /*
- * For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the
- * dividers must be adjusted.
- *
- * uartclk = (m / n) * 100 MHz, where m <= n
- */
- rational_best_approximation(fuart, fref, w, w, &m, &n);
- p->uartclk = fuart;
-
- /* Reset the clock */
- reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT);
- writel(reg, p->membase + BYT_PRV_CLK);
- reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE;
- writel(reg, p->membase + BYT_PRV_CLK);
-
- p->status &= ~UPSTAT_AUTOCTS;
- if (termios->c_cflag & CRTSCTS)
- p->status |= UPSTAT_AUTOCTS;
-
- serial8250_do_set_termios(p, termios, old);
-}
-
-static bool byt_dma_filter(struct dma_chan *chan, void *param)
-{
- struct dw_dma_slave *dws = param;
-
- if (dws->dma_dev != chan->device->dev)
- return false;
-
- chan->private = dws;
- return true;
-}
-
-static unsigned int
-byt_get_mctrl(struct uart_port *port)
-{
- unsigned int ret = serial8250_do_get_mctrl(port);
-
- /* Force DCD and DSR signals to permanently be reported as active. */
- ret |= TIOCM_CAR | TIOCM_DSR;
-
- return ret;
-}
-
-static int
-byt_serial_setup(struct serial_private *priv,
- const struct pciserial_board *board,
- struct uart_8250_port *port, int idx)
-{
- struct pci_dev *pdev = priv->dev;
- struct device *dev = port->port.dev;
- struct uart_8250_dma *dma;
- struct dw_dma_slave *tx_param, *rx_param;
- struct pci_dev *dma_dev;
- int ret;
-
- dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
- if (!dma)
- return -ENOMEM;
-
- tx_param = devm_kzalloc(dev, sizeof(*tx_param), GFP_KERNEL);
- if (!tx_param)
- return -ENOMEM;
-
- rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL);
- if (!rx_param)
- return -ENOMEM;
-
- switch (pdev->device) {
- case PCI_DEVICE_ID_INTEL_BYT_UART1:
- case PCI_DEVICE_ID_INTEL_BSW_UART1:
- case PCI_DEVICE_ID_INTEL_BDW_UART1:
- rx_param->src_id = 3;
- tx_param->dst_id = 2;
- break;
- case PCI_DEVICE_ID_INTEL_BYT_UART2:
- case PCI_DEVICE_ID_INTEL_BSW_UART2:
- case PCI_DEVICE_ID_INTEL_BDW_UART2:
- rx_param->src_id = 5;
- tx_param->dst_id = 4;
- break;
- default:
- return -EINVAL;
- }
-
- rx_param->m_master = 0;
- rx_param->p_master = 1;
-
- dma->rxconf.src_maxburst = 16;
-
- tx_param->m_master = 0;
- tx_param->p_master = 1;
-
- dma->txconf.dst_maxburst = 16;
-
- dma_dev = pci_get_slot(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
- rx_param->dma_dev = &dma_dev->dev;
- tx_param->dma_dev = &dma_dev->dev;
-
- dma->fn = byt_dma_filter;
- dma->rx_param = rx_param;
- dma->tx_param = tx_param;
-
- ret = pci_default_setup(priv, board, port, idx);
- port->port.iotype = UPIO_MEM;
- port->port.type = PORT_16550A;
- port->port.flags = (port->port.flags | UPF_FIXED_PORT | UPF_FIXED_TYPE);
- port->port.set_termios = byt_set_termios;
- port->port.get_mctrl = byt_get_mctrl;
- port->port.fifosize = 64;
- port->tx_loadsz = 64;
- port->dma = dma;
- port->capabilities = UART_CAP_FIFO | UART_CAP_AFE;
-
- /* Disable Tx counter interrupts */
- writel(BYT_TX_OVF_INT_MASK, port->port.membase + BYT_TX_OVF_INT);
-
- return ret;
-}
-
static int
pci_omegapci_setup(struct serial_private *priv,
const struct pciserial_board *board,
@@ -1741,6 +1583,19 @@ static int pci_eg20t_init(struct pci_dev *dev)
#define PCI_DEVICE_ID_EXAR_XR17V4358 0x4358
#define PCI_DEVICE_ID_EXAR_XR17V8358 0x8358
+#define UART_EXAR_MPIOINT_7_0 0x8f /* MPIOINT[7:0] */
+#define UART_EXAR_MPIOLVL_7_0 0x90 /* MPIOLVL[7:0] */
+#define UART_EXAR_MPIO3T_7_0 0x91 /* MPIO3T[7:0] */
+#define UART_EXAR_MPIOINV_7_0 0x92 /* MPIOINV[7:0] */
+#define UART_EXAR_MPIOSEL_7_0 0x93 /* MPIOSEL[7:0] */
+#define UART_EXAR_MPIOOD_7_0 0x94 /* MPIOOD[7:0] */
+#define UART_EXAR_MPIOINT_15_8 0x95 /* MPIOINT[15:8] */
+#define UART_EXAR_MPIOLVL_15_8 0x96 /* MPIOLVL[15:8] */
+#define UART_EXAR_MPIO3T_15_8 0x97 /* MPIO3T[15:8] */
+#define UART_EXAR_MPIOINV_15_8 0x98 /* MPIOINV[15:8] */
+#define UART_EXAR_MPIOSEL_15_8 0x99 /* MPIOSEL[15:8] */
+#define UART_EXAR_MPIOOD_15_8 0x9a /* MPIOOD[15:8] */
+
static int
pci_xr17c154_setup(struct serial_private *priv,
const struct pciserial_board *board,
@@ -1783,18 +1638,18 @@ pci_xr17v35x_setup(struct serial_private *priv,
* Setup Multipurpose Input/Output pins.
*/
if (idx == 0) {
- writeb(0x00, p + 0x8f); /*MPIOINT[7:0]*/
- writeb(0x00, p + 0x90); /*MPIOLVL[7:0]*/
- writeb(0x00, p + 0x91); /*MPIO3T[7:0]*/
- writeb(0x00, p + 0x92); /*MPIOINV[7:0]*/
- writeb(0x00, p + 0x93); /*MPIOSEL[7:0]*/
- writeb(0x00, p + 0x94); /*MPIOOD[7:0]*/
- writeb(0x00, p + 0x95); /*MPIOINT[15:8]*/
- writeb(0x00, p + 0x96); /*MPIOLVL[15:8]*/
- writeb(0x00, p + 0x97); /*MPIO3T[15:8]*/
- writeb(0x00, p + 0x98); /*MPIOINV[15:8]*/
- writeb(0x00, p + 0x99); /*MPIOSEL[15:8]*/
- writeb(0x00, p + 0x9a); /*MPIOOD[15:8]*/
+ writeb(0x00, p + UART_EXAR_MPIOINT_7_0);
+ writeb(0x00, p + UART_EXAR_MPIOLVL_7_0);
+ writeb(0x00, p + UART_EXAR_MPIO3T_7_0);
+ writeb(0x00, p + UART_EXAR_MPIOINV_7_0);
+ writeb(0x00, p + UART_EXAR_MPIOSEL_7_0);
+ writeb(0x00, p + UART_EXAR_MPIOOD_7_0);
+ writeb(0x00, p + UART_EXAR_MPIOINT_15_8);
+ writeb(0x00, p + UART_EXAR_MPIOLVL_15_8);
+ writeb(0x00, p + UART_EXAR_MPIO3T_15_8);
+ writeb(0x00, p + UART_EXAR_MPIOINV_15_8);
+ writeb(0x00, p + UART_EXAR_MPIOSEL_15_8);
+ writeb(0x00, p + UART_EXAR_MPIOOD_15_8);
}
writeb(0x00, p + UART_EXAR_8XMODE);
writeb(UART_FCTR_EXAR_TRGD, p + UART_EXAR_FCTR);
@@ -1830,20 +1685,20 @@ pci_fastcom335_setup(struct serial_private *priv,
switch (priv->dev->device) {
case PCI_DEVICE_ID_COMMTECH_4222PCI335:
case PCI_DEVICE_ID_COMMTECH_4224PCI335:
- writeb(0x78, p + 0x90); /* MPIOLVL[7:0] */
- writeb(0x00, p + 0x92); /* MPIOINV[7:0] */
- writeb(0x00, p + 0x93); /* MPIOSEL[7:0] */
+ 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 + 0x90); /* MPIOLVL[7:0] */
- writeb(0xc0, p + 0x92); /* MPIOINV[7:0] */
- writeb(0xc0, p + 0x93); /* MPIOSEL[7:0] */
+ 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;
}
- writeb(0x00, p + 0x8f); /* MPIOINT[7:0] */
- writeb(0x00, p + 0x91); /* MPIO3T[7:0] */
- writeb(0x00, p + 0x94); /* MPIOOD[7:0] */
+ writeb(0x00, p + UART_EXAR_MPIOINT_7_0);
+ writeb(0x00, p + UART_EXAR_MPIO3T_7_0);
+ writeb(0x00, p + UART_EXAR_MPIOOD_7_0);
}
writeb(0x00, p + UART_EXAR_8XMODE);
writeb(UART_FCTR_EXAR_TRGD, p + UART_EXAR_FCTR);
@@ -1934,7 +1789,6 @@ pci_wch_ch38x_setup(struct serial_private *priv,
#define PCI_DEVICE_ID_COMMTECH_4222PCIE 0x0022
#define PCI_DEVICE_ID_BROADCOM_TRUMANAGE 0x160a
#define PCI_DEVICE_ID_AMCC_ADDIDATA_APCI7800 0x818e
-#define PCI_DEVICE_ID_INTEL_QRK_UART 0x0936
#define PCI_VENDOR_ID_SUNIX 0x1fd4
#define PCI_DEVICE_ID_SUNIX_1999 0x1999
@@ -2078,48 +1932,6 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
.subdevice = PCI_ANY_ID,
.setup = kt_serial_setup,
},
- {
- .vendor = PCI_VENDOR_ID_INTEL,
- .device = PCI_DEVICE_ID_INTEL_BYT_UART1,
- .subvendor = PCI_ANY_ID,
- .subdevice = PCI_ANY_ID,
- .setup = byt_serial_setup,
- },
- {
- .vendor = PCI_VENDOR_ID_INTEL,
- .device = PCI_DEVICE_ID_INTEL_BYT_UART2,
- .subvendor = PCI_ANY_ID,
- .subdevice = PCI_ANY_ID,
- .setup = byt_serial_setup,
- },
- {
- .vendor = PCI_VENDOR_ID_INTEL,
- .device = PCI_DEVICE_ID_INTEL_BSW_UART1,
- .subvendor = PCI_ANY_ID,
- .subdevice = PCI_ANY_ID,
- .setup = byt_serial_setup,
- },
- {
- .vendor = PCI_VENDOR_ID_INTEL,
- .device = PCI_DEVICE_ID_INTEL_BSW_UART2,
- .subvendor = PCI_ANY_ID,
- .subdevice = PCI_ANY_ID,
- .setup = byt_serial_setup,
- },
- {
- .vendor = PCI_VENDOR_ID_INTEL,
- .device = PCI_DEVICE_ID_INTEL_BDW_UART1,
- .subvendor = PCI_ANY_ID,
- .subdevice = PCI_ANY_ID,
- .setup = byt_serial_setup,
- },
- {
- .vendor = PCI_VENDOR_ID_INTEL,
- .device = PCI_DEVICE_ID_INTEL_BDW_UART2,
- .subvendor = PCI_ANY_ID,
- .subdevice = PCI_ANY_ID,
- .setup = byt_serial_setup,
- },
/*
* ITE
*/
@@ -2992,8 +2804,6 @@ enum pci_board_num_t {
pbn_ADDIDATA_PCIe_4_3906250,
pbn_ADDIDATA_PCIe_8_3906250,
pbn_ce4100_1_115200,
- pbn_byt,
- pbn_qrk,
pbn_omegapci,
pbn_NETMOS9900_2s_115200,
pbn_brcm_trumanage,
@@ -3769,18 +3579,6 @@ static struct pciserial_board pci_boards[] = {
.base_baud = 921600,
.reg_shift = 2,
},
- [pbn_byt] = {
- .flags = FL_BASE0,
- .num_ports = 1,
- .base_baud = 2764800,
- .reg_shift = 2,
- },
- [pbn_qrk] = {
- .flags = FL_BASE0,
- .num_ports = 1,
- .base_baud = 2764800,
- .reg_shift = 2,
- },
[pbn_omegapci] = {
.flags = FL_BASE0,
.num_ports = 8,
@@ -3892,6 +3690,15 @@ static const struct pci_device_id blacklist[] = {
{ PCI_VDEVICE(INTEL, 0x081d), },
{ PCI_VDEVICE(INTEL, 0x1191), },
{ PCI_VDEVICE(INTEL, 0x19d8), },
+
+ /* Intel platforms with DesignWare UART */
+ { PCI_VDEVICE(INTEL, 0x0936), },
+ { PCI_VDEVICE(INTEL, 0x0f0a), },
+ { PCI_VDEVICE(INTEL, 0x0f0c), },
+ { PCI_VDEVICE(INTEL, 0x228a), },
+ { PCI_VDEVICE(INTEL, 0x228c), },
+ { PCI_VDEVICE(INTEL, 0x9ce3), },
+ { PCI_VDEVICE(INTEL, 0x9ce4), },
};
/*
@@ -5659,41 +5466,8 @@ static struct pci_device_id serial_pci_tbl[] = {
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CE4100_UART,
PCI_ANY_ID, PCI_ANY_ID, 0, 0,
pbn_ce4100_1_115200 },
- /* Intel BayTrail */
- { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BYT_UART1,
- PCI_ANY_ID, PCI_ANY_ID,
- PCI_CLASS_COMMUNICATION_SERIAL << 8, 0xff0000,
- pbn_byt },
- { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BYT_UART2,
- PCI_ANY_ID, PCI_ANY_ID,
- PCI_CLASS_COMMUNICATION_SERIAL << 8, 0xff0000,
- pbn_byt },
- { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BSW_UART1,
- PCI_ANY_ID, PCI_ANY_ID,
- PCI_CLASS_COMMUNICATION_SERIAL << 8, 0xff0000,
- pbn_byt },
- { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BSW_UART2,
- PCI_ANY_ID, PCI_ANY_ID,
- PCI_CLASS_COMMUNICATION_SERIAL << 8, 0xff0000,
- pbn_byt },
-
- /* Intel Broadwell */
- { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BDW_UART1,
- PCI_ANY_ID, PCI_ANY_ID,
- PCI_CLASS_COMMUNICATION_SERIAL << 8, 0xff0000,
- pbn_byt },
- { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BDW_UART2,
- PCI_ANY_ID, PCI_ANY_ID,
- PCI_CLASS_COMMUNICATION_SERIAL << 8, 0xff0000,
- pbn_byt },
/*
- * Intel Quark x1000
- */
- { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_QRK_UART,
- PCI_ANY_ID, PCI_ANY_ID, 0, 0,
- pbn_qrk },
- /*
* Cronyx Omega PCI
*/
{ PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_CRONYX_OMEGA,
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index bdfa659b9606..1bfb6fdbaa20 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -178,7 +178,7 @@ static const struct serial8250_config uart_config[] = {
.fifo_size = 16,
.tx_loadsz = 16,
.fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00,
- .flags = UART_CAP_FIFO | UART_CAP_AFE,
+ .flags = UART_CAP_FIFO /* | UART_CAP_AFE */,
},
[PORT_U6_16550A] = {
.name = "U6_16550A",
@@ -585,11 +585,11 @@ EXPORT_SYMBOL_GPL(serial8250_rpm_put);
*/
int serial8250_em485_init(struct uart_8250_port *p)
{
- if (p->em485 != NULL)
+ if (p->em485)
return 0;
p->em485 = kmalloc(sizeof(struct uart_8250_em485), GFP_ATOMIC);
- if (p->em485 == NULL)
+ if (!p->em485)
return -ENOMEM;
setup_timer(&p->em485->stop_tx_timer,
@@ -619,7 +619,7 @@ EXPORT_SYMBOL_GPL(serial8250_em485_init);
*/
void serial8250_em485_destroy(struct uart_8250_port *p)
{
- if (p->em485 == NULL)
+ if (!p->em485)
return;
del_timer(&p->em485->start_tx_timer);
@@ -1402,10 +1402,8 @@ static void serial8250_stop_rx(struct uart_port *port)
static void __do_stop_tx_rs485(struct uart_8250_port *p)
{
- if (!p->em485)
- return;
-
serial8250_em485_rts_after_send(p);
+
/*
* Empty the RX FIFO, we are not interested in anything
* received during the half-duplex transmission.
@@ -1414,12 +1412,8 @@ static void __do_stop_tx_rs485(struct uart_8250_port *p)
if (!(p->port.rs485.flags & SER_RS485_RX_DURING_TX)) {
serial8250_clear_fifos(p);
- serial8250_rpm_get(p);
-
p->ier |= UART_IER_RLSI | UART_IER_RDI;
serial_port_out(&p->port, UART_IER, p->ier);
-
- serial8250_rpm_put(p);
}
}
@@ -1429,6 +1423,7 @@ static void serial8250_em485_handle_stop_tx(unsigned long arg)
struct uart_8250_em485 *em485 = p->em485;
unsigned long flags;
+ serial8250_rpm_get(p);
spin_lock_irqsave(&p->port.lock, flags);
if (em485 &&
em485->active_timer == &em485->stop_tx_timer) {
@@ -1436,15 +1431,13 @@ static void serial8250_em485_handle_stop_tx(unsigned long arg)
em485->active_timer = NULL;
}
spin_unlock_irqrestore(&p->port.lock, flags);
+ serial8250_rpm_put(p);
}
static void __stop_tx_rs485(struct uart_8250_port *p)
{
struct uart_8250_em485 *em485 = p->em485;
- if (!em485)
- return;
-
/*
* __do_stop_tx_rs485 is going to set RTS according to config
* AND flush RX FIFO if required.
@@ -1475,7 +1468,7 @@ static inline void __stop_tx(struct uart_8250_port *p)
unsigned char lsr = serial_in(p, UART_LSR);
/*
* To provide required timeing and allow FIFO transfer,
- * __stop_tx_rs485 must be called only when both FIFO and
+ * __stop_tx_rs485() must be called only when both FIFO and
* shift register are empty. It is for device driver to enable
* interrupt on TEMT.
*/
@@ -1484,9 +1477,10 @@ static inline void __stop_tx(struct uart_8250_port *p)
del_timer(&em485->start_tx_timer);
em485->active_timer = NULL;
+
+ __stop_tx_rs485(p);
}
__do_stop_tx(p);
- __stop_tx_rs485(p);
}
static void serial8250_stop_tx(struct uart_port *port)
@@ -1876,6 +1870,30 @@ static int exar_handle_irq(struct uart_port *port)
return ret;
}
+/*
+ * Newer 16550 compatible parts such as the SC16C650 & Altera 16550 Soft IP
+ * have a programmable TX threshold that triggers the THRE interrupt in
+ * the IIR register. In this case, the THRE interrupt indicates the FIFO
+ * has space available. Load it up with tx_loadsz bytes.
+ */
+static int serial8250_tx_threshold_handle_irq(struct uart_port *port)
+{
+ unsigned long flags;
+ unsigned int iir = serial_port_in(port, UART_IIR);
+
+ /* TX Threshold IRQ triggered so load up FIFO */
+ if ((iir & UART_IIR_ID) == UART_IIR_THRI) {
+ struct uart_8250_port *up = up_to_u8250p(port);
+
+ spin_lock_irqsave(&port->lock, flags);
+ serial8250_tx_chars(up);
+ spin_unlock_irqrestore(&port->lock, flags);
+ }
+
+ iir = serial_port_in(port, UART_IIR);
+ return serial8250_handle_irq(port, iir);
+}
+
static unsigned int serial8250_tx_empty(struct uart_port *port)
{
struct uart_8250_port *up = up_to_u8250p(port);
@@ -1988,6 +2006,7 @@ static void wait_for_xmitr(struct uart_8250_port *up, int bits)
if (--tmout == 0)
break;
udelay(1);
+ touch_nmi_watchdog();
}
/* Wait up to 1s for flow control if necessary */
@@ -2164,6 +2183,25 @@ int serial8250_do_startup(struct uart_port *port)
serial_port_out(port, UART_LCR, 0);
}
+ /*
+ * For the Altera 16550 variants, set TX threshold trigger level.
+ */
+ if (((port->type == PORT_ALTR_16550_F32) ||
+ (port->type == PORT_ALTR_16550_F64) ||
+ (port->type == PORT_ALTR_16550_F128)) && (port->fifosize > 1)) {
+ /* Bounds checking of TX threshold (valid 0 to fifosize-2) */
+ if ((up->tx_loadsz < 2) || (up->tx_loadsz > port->fifosize)) {
+ pr_err("ttyS%d TX FIFO Threshold errors, skipping\n",
+ serial_index(port));
+ } else {
+ serial_port_out(port, UART_ALTR_AFR,
+ UART_ALTR_EN_TXFIFO_LW);
+ serial_port_out(port, UART_ALTR_TX_LOW,
+ port->fifosize - up->tx_loadsz);
+ port->handle_irq = serial8250_tx_threshold_handle_irq;
+ }
+ }
+
if (port->irq) {
unsigned char iir1;
/*
@@ -2499,8 +2537,6 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port,
struct ktermios *termios,
struct ktermios *old)
{
- unsigned int tolerance = port->uartclk / 100;
-
/*
* Ask the core to calculate the divisor for us.
* Allow 1% tolerance at the upper limit so uart clks marginally
@@ -2509,7 +2545,7 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port,
*/
return uart_get_baud_rate(port, termios, old,
port->uartclk / 16 / 0xffff,
- (port->uartclk + tolerance) / 16);
+ port->uartclk);
}
void
@@ -2546,12 +2582,9 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
/*
* MCR-based auto flow control. When AFE is enabled, RTS will be
* deasserted when the receive FIFO contains more characters than
- * the trigger, or the MCR RTS bit is cleared. In the case where
- * the remote UART is not using CTS auto flow control, we must
- * have sufficient FIFO entries for the latency of the remote
- * UART to respond. IOW, at least 32 bytes of FIFO.
+ * the trigger, or the MCR RTS bit is cleared.
*/
- if (up->capabilities & UART_CAP_AFE && port->fifosize >= 32) {
+ if (up->capabilities & UART_CAP_AFE) {
up->mcr &= ~UART_MCR_AFE;
if (termios->c_cflag & CRTSCTS)
up->mcr |= UART_MCR_AFE;
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 7c6f7afca5dd..899834776b36 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -120,7 +120,6 @@ config SERIAL_8250_PCI
tristate "8250/16550 PCI device support" if EXPERT
depends on SERIAL_8250 && PCI
default SERIAL_8250
- select RATIONAL
help
This builds standard PCI serial support. You may be able to
disable this feature if you only need legacy serial support.
@@ -402,6 +401,21 @@ config SERIAL_8250_INGENIC
If you have a system using an Ingenic SoC and wish to make use of
its UARTs, say Y to this option. If unsure, say N.
+config SERIAL_8250_LPSS
+ tristate "Support for serial ports on Intel LPSS platforms" if EXPERT
+ default SERIAL_8250
+ depends on SERIAL_8250 && PCI
+ depends on X86 || COMPILE_TEST
+ select DW_DMAC_CORE if SERIAL_8250_DMA
+ select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS)
+ select RATIONAL
+ help
+ Selecting this option will enable handling of the extra features
+ present on the UART found on various Intel platforms such as:
+ - Intel Baytrail SoC
+ - Intel Braswell SoC
+ - Intel Quark X1000 SoC
+
config SERIAL_8250_MID
tristate "Support for serial ports on Intel MID platforms" if EXPERT
default SERIAL_8250
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 367d403d28d5..276c6fb60337 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_SERIAL_8250_LPC18XX) += 8250_lpc18xx.o
obj-$(CONFIG_SERIAL_8250_MT6577) += 8250_mtk.o
obj-$(CONFIG_SERIAL_8250_UNIPHIER) += 8250_uniphier.o
obj-$(CONFIG_SERIAL_8250_INGENIC) += 8250_ingenic.o
+obj-$(CONFIG_SERIAL_8250_LPSS) += 8250_lpss.o
obj-$(CONFIG_SERIAL_8250_MID) += 8250_mid.o
obj-$(CONFIG_SERIAL_8250_MOXA) += 8250_moxa.o
obj-$(CONFIG_SERIAL_OF_PLATFORM) += 8250_of.o
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 518db24a5b36..c7831407a882 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1380,7 +1380,7 @@ config SERIAL_IFX6X60
config SERIAL_PCH_UART
tristate "Intel EG20T PCH/LAPIS Semicon IOH(ML7213/ML7223/ML7831) UART"
- depends on PCI && (X86_32 || COMPILE_TEST)
+ depends on PCI && (X86_32 || MIPS || COMPILE_TEST)
select SERIAL_CORE
help
This driver is for PCH(Platform controller Hub) UART of Intel EG20T
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index 32df2a0cb060..e409d7dac7ab 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -280,7 +280,7 @@ static int altera_jtaguart_verify_port(struct uart_port *port,
/*
* Define the basic serial functions we support.
*/
-static struct uart_ops altera_jtaguart_ops = {
+static const struct uart_ops altera_jtaguart_ops = {
.tx_empty = altera_jtaguart_tx_empty,
.get_mctrl = altera_jtaguart_get_mctrl,
.set_mctrl = altera_jtaguart_set_mctrl,
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index 61b607f2488e..820a74208696 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -404,7 +404,7 @@ static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c)
/*
* Define the basic serial functions we support.
*/
-static struct uart_ops altera_uart_ops = {
+static const struct uart_ops altera_uart_ops = {
.tx_empty = altera_uart_tx_empty,
.get_mctrl = altera_uart_get_mctrl,
.set_mctrl = altera_uart_set_mctrl,
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 8a9e213387a7..e2c33b9528d8 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -93,6 +93,10 @@ static u16 pl011_std_offsets[REG_ARRAY_SIZE] = {
struct vendor_data {
const u16 *reg_offset;
unsigned int ifls;
+ unsigned int fr_busy;
+ unsigned int fr_dsr;
+ unsigned int fr_cts;
+ unsigned int fr_ri;
bool access_32b;
bool oversampling;
bool dma_threshold;
@@ -111,6 +115,10 @@ static unsigned int get_fifosize_arm(struct amba_device *dev)
static struct vendor_data vendor_arm = {
.reg_offset = pl011_std_offsets,
.ifls = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
+ .fr_busy = UART01x_FR_BUSY,
+ .fr_dsr = UART01x_FR_DSR,
+ .fr_cts = UART01x_FR_CTS,
+ .fr_ri = UART011_FR_RI,
.oversampling = false,
.dma_threshold = false,
.cts_event_workaround = false,
@@ -121,6 +129,10 @@ static struct vendor_data vendor_arm = {
static struct vendor_data vendor_sbsa = {
.reg_offset = pl011_std_offsets,
+ .fr_busy = UART01x_FR_BUSY,
+ .fr_dsr = UART01x_FR_DSR,
+ .fr_cts = UART01x_FR_CTS,
+ .fr_ri = UART011_FR_RI,
.access_32b = true,
.oversampling = false,
.dma_threshold = false,
@@ -164,6 +176,10 @@ static unsigned int get_fifosize_st(struct amba_device *dev)
static struct vendor_data vendor_st = {
.reg_offset = pl011_st_offsets,
.ifls = UART011_IFLS_RX_HALF|UART011_IFLS_TX_HALF,
+ .fr_busy = UART01x_FR_BUSY,
+ .fr_dsr = UART01x_FR_DSR,
+ .fr_cts = UART01x_FR_CTS,
+ .fr_ri = UART011_FR_RI,
.oversampling = true,
.dma_threshold = true,
.cts_event_workaround = true,
@@ -188,11 +204,20 @@ static const u16 pl011_zte_offsets[REG_ARRAY_SIZE] = {
[REG_DMACR] = ZX_UART011_DMACR,
};
-static struct vendor_data vendor_zte __maybe_unused = {
+static unsigned int get_fifosize_zte(struct amba_device *dev)
+{
+ return 16;
+}
+
+static struct vendor_data vendor_zte = {
.reg_offset = pl011_zte_offsets,
.access_32b = true,
.ifls = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
- .get_fifosize = get_fifosize_arm,
+ .fr_busy = ZX_UART01x_FR_BUSY,
+ .fr_dsr = ZX_UART01x_FR_DSR,
+ .fr_cts = ZX_UART01x_FR_CTS,
+ .fr_ri = ZX_UART011_FR_RI,
+ .get_fifosize = get_fifosize_zte,
};
/* Deals with DMA transactions */
@@ -1167,7 +1192,7 @@ static void pl011_dma_shutdown(struct uart_amba_port *uap)
return;
/* Disable RX and TX DMA */
- while (pl011_read(uap, REG_FR) & UART01x_FR_BUSY)
+ while (pl011_read(uap, REG_FR) & uap->vendor->fr_busy)
cpu_relax();
spin_lock_irq(&uap->port.lock);
@@ -1416,11 +1441,12 @@ static void pl011_modem_status(struct uart_amba_port *uap)
if (delta & UART01x_FR_DCD)
uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
- if (delta & UART01x_FR_DSR)
+ if (delta & uap->vendor->fr_dsr)
uap->port.icount.dsr++;
- if (delta & UART01x_FR_CTS)
- uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
+ if (delta & uap->vendor->fr_cts)
+ uart_handle_cts_change(&uap->port,
+ status & uap->vendor->fr_cts);
wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
}
@@ -1493,7 +1519,8 @@ static unsigned int pl011_tx_empty(struct uart_port *port)
struct uart_amba_port *uap =
container_of(port, struct uart_amba_port, port);
unsigned int status = pl011_read(uap, REG_FR);
- return status & (UART01x_FR_BUSY|UART01x_FR_TXFF) ? 0 : TIOCSER_TEMT;
+ return status & (uap->vendor->fr_busy | UART01x_FR_TXFF) ?
+ 0 : TIOCSER_TEMT;
}
static unsigned int pl011_get_mctrl(struct uart_port *port)
@@ -1508,9 +1535,9 @@ static unsigned int pl011_get_mctrl(struct uart_port *port)
result |= tiocmbit
TIOCMBIT(UART01x_FR_DCD, TIOCM_CAR);
- TIOCMBIT(UART01x_FR_DSR, TIOCM_DSR);
- TIOCMBIT(UART01x_FR_CTS, TIOCM_CTS);
- TIOCMBIT(UART011_FR_RI, TIOCM_RNG);
+ TIOCMBIT(uap->vendor->fr_dsr, TIOCM_DSR);
+ TIOCMBIT(uap->vendor->fr_cts, TIOCM_CTS);
+ TIOCMBIT(uap->vendor->fr_ri, TIOCM_RNG);
#undef TIOCMBIT
return result;
}
@@ -2191,7 +2218,7 @@ pl011_console_write(struct console *co, const char *s, unsigned int count)
* Finally, wait for transmitter to become empty
* and restore the TCR
*/
- while (pl011_read(uap, REG_FR) & UART01x_FR_BUSY)
+ while (pl011_read(uap, REG_FR) & uap->vendor->fr_busy)
cpu_relax();
if (!uap->vendor->always_enabled)
pl011_write(old_cr, uap, REG_CR);
@@ -2555,7 +2582,8 @@ static int sbsa_uart_probe(struct platform_device *pdev)
ret = platform_get_irq(pdev, 0);
if (ret < 0) {
- dev_err(&pdev->dev, "cannot obtain irq\n");
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "cannot obtain irq\n");
return ret;
}
uap->port.irq = ret;
@@ -2622,6 +2650,11 @@ static struct amba_id pl011_ids[] = {
.mask = 0x00ffffff,
.data = &vendor_st,
},
+ {
+ .id = AMBA_LINUX_ID(0x00, 0x1, 0xffe),
+ .mask = 0x00ffffff,
+ .data = &vendor_zte,
+ },
{ 0, 0 },
};
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index 3a1de5c87cb4..5ac06fcaa9c6 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -464,7 +464,7 @@ static int arc_serial_poll_getchar(struct uart_port *port)
}
#endif
-static struct uart_ops arc_serial_pops = {
+static const struct uart_ops arc_serial_pops = {
.tx_empty = arc_serial_tx_empty,
.set_mctrl = arc_serial_set_mctrl,
.get_mctrl = arc_serial_get_mctrl,
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 2eaa18ddef61..fd8aa1f4ba78 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -166,6 +166,7 @@ struct atmel_uart_port {
u32 rts_low;
bool ms_irq_enabled;
u32 rtor; /* address of receiver timeout register if it exists */
+ bool has_frac_baudrate;
bool has_hw_timer;
struct timer_list uart_timer;
@@ -1634,8 +1635,8 @@ static void atmel_init_property(struct atmel_uart_port *atmel_port,
if (np) {
/* DMA/PDC usage specification */
- if (of_get_property(np, "atmel,use-dma-rx", NULL)) {
- if (of_get_property(np, "dmas", NULL)) {
+ if (of_property_read_bool(np, "atmel,use-dma-rx")) {
+ if (of_property_read_bool(np, "dmas")) {
atmel_port->use_dma_rx = true;
atmel_port->use_pdc_rx = false;
} else {
@@ -1647,8 +1648,8 @@ static void atmel_init_property(struct atmel_uart_port *atmel_port,
atmel_port->use_pdc_rx = false;
}
- if (of_get_property(np, "atmel,use-dma-tx", NULL)) {
- if (of_get_property(np, "dmas", NULL)) {
+ if (of_property_read_bool(np, "atmel,use-dma-tx")) {
+ if (of_property_read_bool(np, "dmas")) {
atmel_port->use_dma_tx = true;
atmel_port->use_pdc_tx = false;
} else {
@@ -1745,6 +1746,11 @@ static void atmel_get_ip_name(struct uart_port *port)
dbgu_uart = 0x44424755; /* DBGU */
new_uart = 0x55415254; /* UART */
+ /*
+ * Only USART devices from at91sam9260 SOC implement fractional
+ * baudrate.
+ */
+ atmel_port->has_frac_baudrate = false;
atmel_port->has_hw_timer = false;
if (name == new_uart) {
@@ -1753,6 +1759,7 @@ static void atmel_get_ip_name(struct uart_port *port)
atmel_port->rtor = ATMEL_UA_RTOR;
} else if (name == usart) {
dev_dbg(port->dev, "Usart\n");
+ atmel_port->has_frac_baudrate = true;
atmel_port->has_hw_timer = true;
atmel_port->rtor = ATMEL_US_RTOR;
} else if (name == dbgu_uart) {
@@ -1764,6 +1771,7 @@ static void atmel_get_ip_name(struct uart_port *port)
case 0x302:
case 0x10213:
dev_dbg(port->dev, "This version is usart\n");
+ atmel_port->has_frac_baudrate = true;
atmel_port->has_hw_timer = true;
atmel_port->rtor = ATMEL_US_RTOR;
break;
@@ -1929,6 +1937,9 @@ static void atmel_shutdown(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ /* Disable modem control lines interrupts */
+ atmel_disable_ms(port);
+
/* Disable interrupts at device level */
atmel_uart_writel(port, ATMEL_US_IDR, -1);
@@ -1979,8 +1990,6 @@ static void atmel_shutdown(struct uart_port *port)
*/
free_irq(port->irq, port);
- atmel_port->ms_irq_enabled = false;
-
atmel_flush_buffer(port);
}
@@ -2025,8 +2034,9 @@ static void atmel_serial_pm(struct uart_port *port, unsigned int state,
static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
unsigned long flags;
- unsigned int old_mode, mode, imr, quot, baud;
+ unsigned int old_mode, mode, imr, quot, baud, div, cd, fp = 0;
/* save the current mode register */
mode = old_mode = atmel_uart_readl(port, ATMEL_US_MR);
@@ -2036,12 +2046,6 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
ATMEL_US_PAR | ATMEL_US_USMODE);
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
- quot = uart_get_divisor(port, baud);
-
- if (quot > 65535) { /* BRGR is 16-bit, so switch to slower clock */
- quot /= 8;
- mode |= ATMEL_US_USCLKS_MCK_DIV8;
- }
/* byte size */
switch (termios->c_cflag & CSIZE) {
@@ -2160,7 +2164,31 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
atmel_uart_writel(port, ATMEL_US_CR, rts_state);
}
- /* set the baud rate */
+ /*
+ * Set the baud rate:
+ * Fractional baudrate allows to setup output frequency more
+ * accurately. This feature is enabled only when using normal mode.
+ * baudrate = selected clock / (8 * (2 - OVER) * (CD + FP / 8))
+ * Currently, OVER is always set to 0 so we get
+ * baudrate = selected clock / (16 * (CD + FP / 8))
+ * then
+ * 8 CD + FP = selected clock / (2 * baudrate)
+ */
+ if (atmel_port->has_frac_baudrate &&
+ (mode & ATMEL_US_USMODE) == ATMEL_US_USMODE_NORMAL) {
+ div = DIV_ROUND_CLOSEST(port->uartclk, baud * 2);
+ cd = div >> 3;
+ fp = div & ATMEL_US_FP_MASK;
+ } else {
+ cd = uart_get_divisor(port, baud);
+ }
+
+ if (cd > 65535) { /* BRGR is 16-bit, so switch to slower clock */
+ cd /= 8;
+ mode |= ATMEL_US_USCLKS_MCK_DIV8;
+ }
+ quot = cd | fp << ATMEL_US_FP_OFFSET;
+
atmel_uart_writel(port, ATMEL_US_BRGR, quot);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN);
@@ -2292,7 +2320,7 @@ static void atmel_poll_put_char(struct uart_port *port, unsigned char ch)
}
#endif
-static struct uart_ops atmel_pops = {
+static const struct uart_ops atmel_pops = {
.tx_empty = atmel_tx_empty,
.set_mctrl = atmel_set_mctrl,
.get_mctrl = atmel_get_mctrl,
diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
index 5108fab953aa..583c9a0c7ecc 100644
--- a/drivers/tty/serial/bcm63xx_uart.c
+++ b/drivers/tty/serial/bcm63xx_uart.c
@@ -631,7 +631,7 @@ static int bcm_uart_verify_port(struct uart_port *port,
}
/* serial core callbacks */
-static struct uart_ops bcm_uart_ops = {
+static const struct uart_ops bcm_uart_ops = {
.tx_empty = bcm_uart_tx_empty,
.get_mctrl = bcm_uart_get_mctrl,
.set_mctrl = bcm_uart_set_mctrl,
diff --git a/drivers/tty/serial/earlycon-arm-semihost.c b/drivers/tty/serial/earlycon-arm-semihost.c
index 383db10fbb49..6bbeb699777c 100644
--- a/drivers/tty/serial/earlycon-arm-semihost.c
+++ b/drivers/tty/serial/earlycon-arm-semihost.c
@@ -53,7 +53,8 @@ static void smh_write(struct console *con, const char *s, unsigned n)
uart_console_write(&dev->port, s, n, smh_putc);
}
-int __init early_smh_setup(struct earlycon_device *device, const char *opt)
+static int
+__init early_smh_setup(struct earlycon_device *device, const char *opt)
{
device->con->write = smh_write;
return 0;
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index 067783f0523c..c3651540e1ba 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -21,6 +21,7 @@
#include <linux/sizes.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
+#include <linux/acpi.h>
#ifdef CONFIG_FIX_EARLYCON_MEM
#include <asm/fixmap.h>
@@ -38,7 +39,7 @@ static struct earlycon_device early_console_dev = {
.con = &early_con,
};
-static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
+static void __iomem * __init earlycon_map(resource_size_t paddr, size_t size)
{
void __iomem *base;
#ifdef CONFIG_FIX_EARLYCON_MEM
@@ -49,8 +50,7 @@ static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
base = ioremap(paddr, size);
#endif
if (!base)
- pr_err("%s: Couldn't map 0x%llx\n", __func__,
- (unsigned long long)paddr);
+ pr_err("%s: Couldn't map %pa\n", __func__, &paddr);
return base;
}
@@ -92,7 +92,7 @@ static int __init parse_options(struct earlycon_device *device, char *options)
{
struct uart_port *port = &device->port;
int length;
- unsigned long addr;
+ resource_size_t addr;
if (uart_parse_earlycon(options, &port->iotype, &addr, &options))
return -EINVAL;
@@ -199,6 +199,14 @@ int __init setup_earlycon(char *buf)
return -ENOENT;
}
+/*
+ * When CONFIG_ACPI_SPCR_TABLE is defined, "earlycon" without parameters in
+ * command line does not start DT earlycon immediately, instead it defers
+ * starting it until DT/ACPI decision is made. At that time if ACPI is enabled
+ * call parse_spcr(), else call early_init_dt_scan_chosen_stdout()
+ */
+bool earlycon_init_is_deferred __initdata;
+
/* early_param wrapper for setup_earlycon() */
static int __init param_setup_earlycon(char *buf)
{
@@ -208,8 +216,14 @@ static int __init param_setup_earlycon(char *buf)
* Just 'earlycon' is a valid param for devicetree earlycons;
* don't generate a warning from parse_early_params() in that case
*/
- if (!buf || !buf[0])
- return 0;
+ if (!buf || !buf[0]) {
+ if (IS_ENABLED(CONFIG_ACPI_SPCR_TABLE)) {
+ earlycon_init_is_deferred = true;
+ return 0;
+ } else {
+ return early_init_dt_scan_chosen_stdout();
+ }
+ }
err = setup_earlycon(buf);
if (err == -ENOENT || err == -EALREADY)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 7f95f782a485..de9d5107c00a 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -224,7 +224,8 @@
#define UARTWATER_TXWATER_OFF 0
#define UARTWATER_RXWATER_OFF 16
-#define FSL_UART_RX_DMA_BUFFER_SIZE 64
+/* Rx DMA timeout in ms, which is used to calculate Rx ring buffer size */
+#define DMA_RX_TIMEOUT (10)
#define DRIVER_NAME "fsl-lpuart"
#define DEV_NAME "ttyLP"
@@ -243,18 +244,18 @@ struct lpuart_port {
struct dma_chan *dma_rx_chan;
struct dma_async_tx_descriptor *dma_tx_desc;
struct dma_async_tx_descriptor *dma_rx_desc;
- dma_addr_t dma_tx_buf_bus;
- dma_addr_t dma_rx_buf_bus;
dma_cookie_t dma_tx_cookie;
dma_cookie_t dma_rx_cookie;
- unsigned char *dma_tx_buf_virt;
- unsigned char *dma_rx_buf_virt;
unsigned int dma_tx_bytes;
unsigned int dma_rx_bytes;
- int dma_tx_in_progress;
- int dma_rx_in_progress;
+ bool dma_tx_in_progress;
unsigned int dma_rx_timeout;
struct timer_list lpuart_timer;
+ struct scatterlist rx_sgl, tx_sgl[2];
+ struct circ_buf rx_ring;
+ int rx_dma_rng_buf_len;
+ unsigned int dma_tx_nents;
+ wait_queue_head_t dma_wait;
};
static const struct of_device_id lpuart_dt_ids[] = {
@@ -270,7 +271,6 @@ MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
/* Forward declare this for the dma callbacks*/
static void lpuart_dma_tx_complete(void *arg);
-static void lpuart_dma_rx_complete(void *arg);
static u32 lpuart32_read(void __iomem *addr)
{
@@ -316,141 +316,103 @@ static void lpuart32_stop_rx(struct uart_port *port)
lpuart32_write(temp & ~UARTCTRL_RE, port->membase + UARTCTRL);
}
-static void lpuart_copy_rx_to_tty(struct lpuart_port *sport,
- struct tty_port *tty, int count)
+static void lpuart_dma_tx(struct lpuart_port *sport)
{
- int copied;
-
- sport->port.icount.rx += count;
+ struct circ_buf *xmit = &sport->port.state->xmit;
+ struct scatterlist *sgl = sport->tx_sgl;
+ struct device *dev = sport->port.dev;
+ int ret;
- if (!tty) {
- dev_err(sport->port.dev, "No tty port\n");
+ if (sport->dma_tx_in_progress)
return;
- }
- dma_sync_single_for_cpu(sport->port.dev, sport->dma_rx_buf_bus,
- FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
- copied = tty_insert_flip_string(tty,
- ((unsigned char *)(sport->dma_rx_buf_virt)), count);
+ sport->dma_tx_bytes = uart_circ_chars_pending(xmit);
- if (copied != count) {
- WARN_ON(1);
- dev_err(sport->port.dev, "RxData copy to tty layer failed\n");
+ if (xmit->tail < xmit->head) {
+ 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);
}
- dma_sync_single_for_device(sport->port.dev, sport->dma_rx_buf_bus,
- FSL_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE);
-}
-
-static void lpuart_pio_tx(struct lpuart_port *sport)
-{
- struct circ_buf *xmit = &sport->port.state->xmit;
- unsigned long flags;
-
- spin_lock_irqsave(&sport->port.lock, flags);
-
- while (!uart_circ_empty(xmit) &&
- readb(sport->port.membase + UARTTCFIFO) < sport->txfifo_size) {
- writeb(xmit->buf[xmit->tail], sport->port.membase + UARTDR);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- sport->port.icount.tx++;
+ ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
+ if (!ret) {
+ dev_err(dev, "DMA mapping error for TX.\n");
+ return;
}
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&sport->port);
-
- if (uart_circ_empty(xmit))
- writeb(readb(sport->port.membase + UARTCR5) | UARTCR5_TDMAS,
- sport->port.membase + UARTCR5);
-
- spin_unlock_irqrestore(&sport->port.lock, flags);
-}
-
-static int lpuart_dma_tx(struct lpuart_port *sport, unsigned long count)
-{
- struct circ_buf *xmit = &sport->port.state->xmit;
- dma_addr_t tx_bus_addr;
-
- dma_sync_single_for_device(sport->port.dev, sport->dma_tx_buf_bus,
- UART_XMIT_SIZE, DMA_TO_DEVICE);
- sport->dma_tx_bytes = count & ~(sport->txfifo_size - 1);
- tx_bus_addr = sport->dma_tx_buf_bus + xmit->tail;
- sport->dma_tx_desc = dmaengine_prep_slave_single(sport->dma_tx_chan,
- tx_bus_addr, sport->dma_tx_bytes,
+ sport->dma_tx_desc = dmaengine_prep_slave_sg(sport->dma_tx_chan, sgl,
+ sport->dma_tx_nents,
DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
-
if (!sport->dma_tx_desc) {
- dev_err(sport->port.dev, "Not able to get desc for tx\n");
- return -EIO;
+ dma_unmap_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
+ dev_err(dev, "Cannot prepare TX slave DMA!\n");
+ return;
}
sport->dma_tx_desc->callback = lpuart_dma_tx_complete;
sport->dma_tx_desc->callback_param = sport;
- sport->dma_tx_in_progress = 1;
+ sport->dma_tx_in_progress = true;
sport->dma_tx_cookie = dmaengine_submit(sport->dma_tx_desc);
dma_async_issue_pending(sport->dma_tx_chan);
- return 0;
-}
-
-static void lpuart_prepare_tx(struct lpuart_port *sport)
-{
- struct circ_buf *xmit = &sport->port.state->xmit;
- unsigned long count = CIRC_CNT_TO_END(xmit->head,
- xmit->tail, UART_XMIT_SIZE);
-
- if (!count)
- return;
-
- if (count < sport->txfifo_size)
- writeb(readb(sport->port.membase + UARTCR5) & ~UARTCR5_TDMAS,
- sport->port.membase + UARTCR5);
- else {
- writeb(readb(sport->port.membase + UARTCR5) | UARTCR5_TDMAS,
- sport->port.membase + UARTCR5);
- lpuart_dma_tx(sport, count);
- }
}
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;
unsigned long flags;
- async_tx_ack(sport->dma_tx_desc);
-
spin_lock_irqsave(&sport->port.lock, flags);
+ dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
+
xmit->tail = (xmit->tail + sport->dma_tx_bytes) & (UART_XMIT_SIZE - 1);
- sport->dma_tx_in_progress = 0;
+
+ sport->port.icount.tx += sport->dma_tx_bytes;
+ sport->dma_tx_in_progress = false;
+ spin_unlock_irqrestore(&sport->port.lock, flags);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
- lpuart_prepare_tx(sport);
+ if (waitqueue_active(&sport->dma_wait)) {
+ wake_up(&sport->dma_wait);
+ return;
+ }
+
+ spin_lock_irqsave(&sport->port.lock, flags);
+
+ if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port))
+ lpuart_dma_tx(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
-static int lpuart_dma_rx(struct lpuart_port *sport)
+static int lpuart_dma_tx_request(struct uart_port *port)
{
- dma_sync_single_for_device(sport->port.dev, sport->dma_rx_buf_bus,
- FSL_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE);
- sport->dma_rx_desc = dmaengine_prep_slave_single(sport->dma_rx_chan,
- sport->dma_rx_buf_bus, FSL_UART_RX_DMA_BUFFER_SIZE,
- DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
+ struct lpuart_port *sport = container_of(port,
+ struct lpuart_port, port);
+ struct dma_slave_config dma_tx_sconfig = {};
+ int ret;
- if (!sport->dma_rx_desc) {
- dev_err(sport->port.dev, "Not able to get desc for rx\n");
- return -EIO;
- }
+ dma_tx_sconfig.dst_addr = sport->port.mapbase + UARTDR;
+ dma_tx_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ dma_tx_sconfig.dst_maxburst = 1;
+ dma_tx_sconfig.direction = DMA_MEM_TO_DEV;
+ ret = dmaengine_slave_config(sport->dma_tx_chan, &dma_tx_sconfig);
- sport->dma_rx_desc->callback = lpuart_dma_rx_complete;
- sport->dma_rx_desc->callback_param = sport;
- sport->dma_rx_in_progress = 1;
- sport->dma_rx_cookie = dmaengine_submit(sport->dma_rx_desc);
- dma_async_issue_pending(sport->dma_rx_chan);
+ if (ret) {
+ dev_err(sport->port.dev,
+ "DMA slave config failed, err = %d\n", ret);
+ return ret;
+ }
return 0;
}
@@ -458,75 +420,17 @@ static int lpuart_dma_rx(struct lpuart_port *sport)
static void lpuart_flush_buffer(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+
if (sport->lpuart_dma_tx_use) {
+ if (sport->dma_tx_in_progress) {
+ dma_unmap_sg(sport->port.dev, &sport->tx_sgl[0],
+ sport->dma_tx_nents, DMA_TO_DEVICE);
+ sport->dma_tx_in_progress = false;
+ }
dmaengine_terminate_all(sport->dma_tx_chan);
- sport->dma_tx_in_progress = 0;
}
}
-static void lpuart_dma_rx_complete(void *arg)
-{
- struct lpuart_port *sport = arg;
- struct tty_port *port = &sport->port.state->port;
- unsigned long flags;
-
- async_tx_ack(sport->dma_rx_desc);
- mod_timer(&sport->lpuart_timer, jiffies + sport->dma_rx_timeout);
-
- spin_lock_irqsave(&sport->port.lock, flags);
-
- sport->dma_rx_in_progress = 0;
- lpuart_copy_rx_to_tty(sport, port, FSL_UART_RX_DMA_BUFFER_SIZE);
- tty_flip_buffer_push(port);
- lpuart_dma_rx(sport);
-
- spin_unlock_irqrestore(&sport->port.lock, flags);
-}
-
-static void lpuart_timer_func(unsigned long data)
-{
- struct lpuart_port *sport = (struct lpuart_port *)data;
- struct tty_port *port = &sport->port.state->port;
- struct dma_tx_state state;
- unsigned long flags;
- unsigned char temp;
- int count;
-
- del_timer(&sport->lpuart_timer);
- dmaengine_pause(sport->dma_rx_chan);
- dmaengine_tx_status(sport->dma_rx_chan, sport->dma_rx_cookie, &state);
- dmaengine_terminate_all(sport->dma_rx_chan);
- count = FSL_UART_RX_DMA_BUFFER_SIZE - state.residue;
- async_tx_ack(sport->dma_rx_desc);
-
- spin_lock_irqsave(&sport->port.lock, flags);
-
- sport->dma_rx_in_progress = 0;
- lpuart_copy_rx_to_tty(sport, port, count);
- tty_flip_buffer_push(port);
- temp = readb(sport->port.membase + UARTCR5);
- writeb(temp & ~UARTCR5_RDMAS, sport->port.membase + UARTCR5);
-
- spin_unlock_irqrestore(&sport->port.lock, flags);
-}
-
-static inline void lpuart_prepare_rx(struct lpuart_port *sport)
-{
- unsigned long flags;
- unsigned char temp;
-
- spin_lock_irqsave(&sport->port.lock, flags);
-
- sport->lpuart_timer.expires = jiffies + sport->dma_rx_timeout;
- add_timer(&sport->lpuart_timer);
-
- lpuart_dma_rx(sport);
- temp = readb(sport->port.membase + UARTCR5);
- writeb(temp | UARTCR5_RDMAS, sport->port.membase + UARTCR5);
-
- spin_unlock_irqrestore(&sport->port.lock, flags);
-}
-
static inline void lpuart_transmit_buffer(struct lpuart_port *sport)
{
struct circ_buf *xmit = &sport->port.state->xmit;
@@ -580,8 +484,8 @@ static void lpuart_start_tx(struct uart_port *port)
writeb(temp | UARTCR2_TIE, port->membase + UARTCR2);
if (sport->lpuart_dma_tx_use) {
- if (!uart_circ_empty(xmit) && !sport->dma_tx_in_progress)
- lpuart_prepare_tx(sport);
+ if (!uart_circ_empty(xmit) && !uart_tx_stopped(port))
+ lpuart_dma_tx(sport);
} else {
if (readb(port->membase + UARTSR1) & UARTSR1_TDRE)
lpuart_transmit_buffer(sport);
@@ -600,6 +504,29 @@ static void lpuart32_start_tx(struct uart_port *port)
lpuart32_transmit_buffer(sport);
}
+/* return TIOCSER_TEMT when transmitter is not busy */
+static unsigned int lpuart_tx_empty(struct uart_port *port)
+{
+ struct lpuart_port *sport = container_of(port,
+ struct lpuart_port, port);
+ unsigned char sr1 = readb(port->membase + UARTSR1);
+ unsigned char sfifo = readb(port->membase + UARTSFIFO);
+
+ if (sport->dma_tx_in_progress)
+ return 0;
+
+ if (sr1 & UARTSR1_TC && sfifo & UARTSFIFO_TXEMPT)
+ return TIOCSER_TEMT;
+
+ return 0;
+}
+
+static unsigned int lpuart32_tx_empty(struct uart_port *port)
+{
+ return (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TC) ?
+ TIOCSER_TEMT : 0;
+}
+
static irqreturn_t lpuart_txint(int irq, void *dev_id)
{
struct lpuart_port *sport = dev_id;
@@ -766,23 +693,15 @@ out:
static irqreturn_t lpuart_int(int irq, void *dev_id)
{
struct lpuart_port *sport = dev_id;
- unsigned char sts, crdma;
+ unsigned char sts;
sts = readb(sport->port.membase + UARTSR1);
- crdma = readb(sport->port.membase + UARTCR5);
- if (sts & UARTSR1_RDRF && !(crdma & UARTCR5_RDMAS)) {
- if (sport->lpuart_dma_rx_use)
- lpuart_prepare_rx(sport);
- else
- lpuart_rxint(irq, dev_id);
- }
- if (sts & UARTSR1_TDRE && !(crdma & UARTCR5_TDMAS)) {
- if (sport->lpuart_dma_tx_use)
- lpuart_pio_tx(sport);
- else
- lpuart_txint(irq, dev_id);
- }
+ if (sts & UARTSR1_RDRF)
+ lpuart_rxint(irq, dev_id);
+
+ if (sts & UARTSR1_TDRE)
+ lpuart_txint(irq, dev_id);
return IRQ_HANDLED;
}
@@ -807,17 +726,241 @@ static irqreturn_t lpuart32_int(int irq, void *dev_id)
return IRQ_HANDLED;
}
-/* return TIOCSER_TEMT when transmitter is not busy */
-static unsigned int lpuart_tx_empty(struct uart_port *port)
+static void lpuart_copy_rx_to_tty(struct lpuart_port *sport)
{
- return (readb(port->membase + UARTSR1) & UARTSR1_TC) ?
- TIOCSER_TEMT : 0;
+ struct tty_port *port = &sport->port.state->port;
+ struct dma_tx_state state;
+ enum dma_status dmastat;
+ struct circ_buf *ring = &sport->rx_ring;
+ unsigned long flags;
+ int count = 0;
+ unsigned char sr;
+
+ sr = readb(sport->port.membase + UARTSR1);
+
+ if (sr & (UARTSR1_PE | UARTSR1_FE)) {
+ /* Read DR to clear the error flags */
+ readb(sport->port.membase + UARTDR);
+
+ if (sr & UARTSR1_PE)
+ sport->port.icount.parity++;
+ else if (sr & UARTSR1_FE)
+ sport->port.icount.frame++;
+ }
+
+ async_tx_ack(sport->dma_rx_desc);
+
+ spin_lock_irqsave(&sport->port.lock, flags);
+
+ dmastat = dmaengine_tx_status(sport->dma_rx_chan,
+ sport->dma_rx_cookie,
+ &state);
+
+ if (dmastat == DMA_ERROR) {
+ dev_err(sport->port.dev, "Rx DMA transfer failed!\n");
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+ return;
+ }
+
+ /* CPU claims ownership of RX DMA buffer */
+ dma_sync_sg_for_cpu(sport->port.dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE);
+
+ /*
+ * ring->head points to the end of data already written by the DMA.
+ * ring->tail points to the beginning of data to be read by the
+ * framework.
+ * The current transfer size should not be larger than the dma buffer
+ * length.
+ */
+ ring->head = sport->rx_sgl.length - state.residue;
+ BUG_ON(ring->head > sport->rx_sgl.length);
+ /*
+ * At this point ring->head may point to the first byte right after the
+ * last byte of the dma buffer:
+ * 0 <= ring->head <= sport->rx_sgl.length
+ *
+ * However ring->tail must always points inside the dma buffer:
+ * 0 <= ring->tail <= sport->rx_sgl.length - 1
+ *
+ * Since we use a ring buffer, we have to handle the case
+ * where head is lower than tail. In such a case, we first read from
+ * tail to the end of the buffer then reset tail.
+ */
+ if (ring->head < ring->tail) {
+ count = sport->rx_sgl.length - ring->tail;
+
+ tty_insert_flip_string(port, ring->buf + ring->tail, count);
+ ring->tail = 0;
+ sport->port.icount.rx += count;
+ }
+
+ /* Finally we read data from tail to head */
+ if (ring->tail < ring->head) {
+ count = ring->head - ring->tail;
+ tty_insert_flip_string(port, ring->buf + ring->tail, count);
+ /* Wrap ring->head if needed */
+ if (ring->head >= sport->rx_sgl.length)
+ ring->head = 0;
+ ring->tail = ring->head;
+ sport->port.icount.rx += count;
+ }
+
+ dma_sync_sg_for_device(sport->port.dev, &sport->rx_sgl, 1,
+ DMA_FROM_DEVICE);
+
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+
+ tty_flip_buffer_push(port);
+ mod_timer(&sport->lpuart_timer, jiffies + sport->dma_rx_timeout);
}
-static unsigned int lpuart32_tx_empty(struct uart_port *port)
+static void lpuart_dma_rx_complete(void *arg)
{
- return (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TC) ?
- TIOCSER_TEMT : 0;
+ struct lpuart_port *sport = arg;
+
+ lpuart_copy_rx_to_tty(sport);
+}
+
+static void lpuart_timer_func(unsigned long data)
+{
+ struct lpuart_port *sport = (struct lpuart_port *)data;
+
+ lpuart_copy_rx_to_tty(sport);
+}
+
+static inline int lpuart_start_rx_dma(struct lpuart_port *sport)
+{
+ struct dma_slave_config dma_rx_sconfig = {};
+ struct circ_buf *ring = &sport->rx_ring;
+ int ret, nent;
+ int bits, baud;
+ struct tty_struct *tty = tty_port_tty_get(&sport->port.state->port);
+ struct ktermios *termios = &tty->termios;
+
+ baud = tty_get_baud_rate(tty);
+
+ bits = (termios->c_cflag & CSIZE) == CS7 ? 9 : 10;
+ if (termios->c_cflag & PARENB)
+ bits++;
+
+ /*
+ * Calculate length of one DMA buffer size to keep latency below
+ * 10ms at any baud rate.
+ */
+ sport->rx_dma_rng_buf_len = (DMA_RX_TIMEOUT * baud / bits / 1000) * 2;
+ sport->rx_dma_rng_buf_len = (1 << (fls(sport->rx_dma_rng_buf_len) - 1));
+ if (sport->rx_dma_rng_buf_len < 16)
+ sport->rx_dma_rng_buf_len = 16;
+
+ ring->buf = kmalloc(sport->rx_dma_rng_buf_len, GFP_ATOMIC);
+ if (!ring->buf) {
+ dev_err(sport->port.dev, "Ring buf alloc failed\n");
+ return -ENOMEM;
+ }
+
+ sg_init_one(&sport->rx_sgl, ring->buf, sport->rx_dma_rng_buf_len);
+ sg_set_buf(&sport->rx_sgl, ring->buf, sport->rx_dma_rng_buf_len);
+ nent = dma_map_sg(sport->port.dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE);
+
+ if (!nent) {
+ dev_err(sport->port.dev, "DMA Rx mapping error\n");
+ return -EINVAL;
+ }
+
+ dma_rx_sconfig.src_addr = sport->port.mapbase + UARTDR;
+ dma_rx_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ dma_rx_sconfig.src_maxburst = 1;
+ dma_rx_sconfig.direction = DMA_DEV_TO_MEM;
+ ret = dmaengine_slave_config(sport->dma_rx_chan, &dma_rx_sconfig);
+
+ if (ret < 0) {
+ dev_err(sport->port.dev,
+ "DMA Rx slave config failed, err = %d\n", ret);
+ return ret;
+ }
+
+ sport->dma_rx_desc = dmaengine_prep_dma_cyclic(sport->dma_rx_chan,
+ sg_dma_address(&sport->rx_sgl),
+ sport->rx_sgl.length,
+ sport->rx_sgl.length / 2,
+ DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT);
+ if (!sport->dma_rx_desc) {
+ dev_err(sport->port.dev, "Cannot prepare cyclic DMA\n");
+ return -EFAULT;
+ }
+
+ sport->dma_rx_desc->callback = lpuart_dma_rx_complete;
+ sport->dma_rx_desc->callback_param = sport;
+ sport->dma_rx_cookie = dmaengine_submit(sport->dma_rx_desc);
+ dma_async_issue_pending(sport->dma_rx_chan);
+
+ writeb(readb(sport->port.membase + UARTCR5) | UARTCR5_RDMAS,
+ sport->port.membase + UARTCR5);
+
+ return 0;
+}
+
+static void lpuart_dma_rx_free(struct uart_port *port)
+{
+ struct lpuart_port *sport = container_of(port,
+ struct lpuart_port, port);
+
+ if (sport->dma_rx_chan)
+ dmaengine_terminate_all(sport->dma_rx_chan);
+
+ dma_unmap_sg(sport->port.dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE);
+ kfree(sport->rx_ring.buf);
+ sport->rx_ring.tail = 0;
+ sport->rx_ring.head = 0;
+ sport->dma_rx_desc = NULL;
+ sport->dma_rx_cookie = -EINVAL;
+}
+
+static int lpuart_config_rs485(struct uart_port *port,
+ struct serial_rs485 *rs485)
+{
+ struct lpuart_port *sport = container_of(port,
+ struct lpuart_port, port);
+
+ u8 modem = readb(sport->port.membase + UARTMODEM) &
+ ~(UARTMODEM_TXRTSPOL | UARTMODEM_TXRTSE);
+ writeb(modem, sport->port.membase + UARTMODEM);
+
+ if (rs485->flags & SER_RS485_ENABLED) {
+ /* Enable auto RS-485 RTS mode */
+ modem |= UARTMODEM_TXRTSE;
+
+ /*
+ * RTS needs to be logic HIGH either during transer _or_ after
+ * transfer, other variants are not supported by the hardware.
+ */
+
+ if (!(rs485->flags & (SER_RS485_RTS_ON_SEND |
+ SER_RS485_RTS_AFTER_SEND)))
+ rs485->flags |= SER_RS485_RTS_ON_SEND;
+
+ if (rs485->flags & SER_RS485_RTS_ON_SEND &&
+ rs485->flags & SER_RS485_RTS_AFTER_SEND)
+ rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
+
+ /*
+ * The hardware defaults to RTS logic HIGH while transfer.
+ * Switch polarity in case RTS shall be logic HIGH
+ * after transfer.
+ * Note: UART is assumed to be active high.
+ */
+ if (rs485->flags & SER_RS485_RTS_ON_SEND)
+ modem &= ~UARTMODEM_TXRTSPOL;
+ else if (rs485->flags & SER_RS485_RTS_AFTER_SEND)
+ modem |= UARTMODEM_TXRTSPOL;
+ }
+
+ /* Store the new configuration */
+ sport->port.rs485 = *rs485;
+
+ writeb(modem, sport->port.membase + UARTMODEM);
+ return 0;
}
static unsigned int lpuart_get_mctrl(struct uart_port *port)
@@ -853,17 +996,22 @@ static unsigned int lpuart32_get_mctrl(struct uart_port *port)
static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
unsigned char temp;
+ struct lpuart_port *sport = container_of(port,
+ struct lpuart_port, port);
- temp = readb(port->membase + UARTMODEM) &
+ /* Make sure RXRTSE bit is not set when RS485 is enabled */
+ if (!(sport->port.rs485.flags & SER_RS485_ENABLED)) {
+ temp = readb(sport->port.membase + UARTMODEM) &
~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
- if (mctrl & TIOCM_RTS)
- temp |= UARTMODEM_RXRTSE;
+ if (mctrl & TIOCM_RTS)
+ temp |= UARTMODEM_RXRTSE;
- if (mctrl & TIOCM_CTS)
- temp |= UARTMODEM_TXCTSE;
+ if (mctrl & TIOCM_CTS)
+ temp |= UARTMODEM_TXCTSE;
- writeb(temp, port->membase + UARTMODEM);
+ writeb(temp, port->membase + UARTMODEM);
+ }
}
static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl)
@@ -921,13 +1069,16 @@ static void lpuart_setup_watermark(struct lpuart_port *sport)
writeb(val | UARTPFIFO_TXFE | UARTPFIFO_RXFE,
sport->port.membase + UARTPFIFO);
- /* explicitly clear RDRF */
- readb(sport->port.membase + UARTSR1);
-
/* flush Tx and Rx FIFO */
writeb(UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH,
sport->port.membase + UARTCFIFO);
+ /* explicitly clear RDRF */
+ if (readb(sport->port.membase + UARTSR1) & UARTSR1_RDRF) {
+ readb(sport->port.membase + UARTDR);
+ writeb(UARTSFIFO_RXUF, sport->port.membase + UARTSFIFO);
+ }
+
writeb(0, sport->port.membase + UARTTWFIFO);
writeb(1, sport->port.membase + UARTRWFIFO);
@@ -960,110 +1111,12 @@ static void lpuart32_setup_watermark(struct lpuart_port *sport)
lpuart32_write(ctrl_saved, sport->port.membase + UARTCTRL);
}
-static int lpuart_dma_tx_request(struct uart_port *port)
-{
- struct lpuart_port *sport = container_of(port,
- struct lpuart_port, port);
- struct dma_slave_config dma_tx_sconfig;
- dma_addr_t dma_bus;
- unsigned char *dma_buf;
- int ret;
-
- dma_bus = dma_map_single(sport->dma_tx_chan->device->dev,
- sport->port.state->xmit.buf,
- UART_XMIT_SIZE, DMA_TO_DEVICE);
-
- if (dma_mapping_error(sport->dma_tx_chan->device->dev, dma_bus)) {
- dev_err(sport->port.dev, "dma_map_single tx failed\n");
- return -ENOMEM;
- }
-
- dma_buf = sport->port.state->xmit.buf;
- dma_tx_sconfig.dst_addr = sport->port.mapbase + UARTDR;
- dma_tx_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- dma_tx_sconfig.dst_maxburst = sport->txfifo_size;
- dma_tx_sconfig.direction = DMA_MEM_TO_DEV;
- ret = dmaengine_slave_config(sport->dma_tx_chan, &dma_tx_sconfig);
-
- if (ret < 0) {
- dev_err(sport->port.dev,
- "Dma slave config failed, err = %d\n", ret);
- return ret;
- }
-
- sport->dma_tx_buf_virt = dma_buf;
- sport->dma_tx_buf_bus = dma_bus;
- sport->dma_tx_in_progress = 0;
-
- return 0;
-}
-
-static int lpuart_dma_rx_request(struct uart_port *port)
+static void rx_dma_timer_init(struct lpuart_port *sport)
{
- struct lpuart_port *sport = container_of(port,
- struct lpuart_port, port);
- struct dma_slave_config dma_rx_sconfig;
- dma_addr_t dma_bus;
- unsigned char *dma_buf;
- int ret;
-
- dma_buf = devm_kzalloc(sport->port.dev,
- FSL_UART_RX_DMA_BUFFER_SIZE, GFP_KERNEL);
-
- if (!dma_buf) {
- dev_err(sport->port.dev, "Dma rx alloc failed\n");
- return -ENOMEM;
- }
-
- dma_bus = dma_map_single(sport->dma_rx_chan->device->dev, dma_buf,
- FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
-
- if (dma_mapping_error(sport->dma_rx_chan->device->dev, dma_bus)) {
- dev_err(sport->port.dev, "dma_map_single rx failed\n");
- return -ENOMEM;
- }
-
- dma_rx_sconfig.src_addr = sport->port.mapbase + UARTDR;
- dma_rx_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- dma_rx_sconfig.src_maxburst = 1;
- dma_rx_sconfig.direction = DMA_DEV_TO_MEM;
- ret = dmaengine_slave_config(sport->dma_rx_chan, &dma_rx_sconfig);
-
- if (ret < 0) {
- dev_err(sport->port.dev,
- "Dma slave config failed, err = %d\n", ret);
- return ret;
- }
-
- sport->dma_rx_buf_virt = dma_buf;
- sport->dma_rx_buf_bus = dma_bus;
- sport->dma_rx_in_progress = 0;
-
- return 0;
-}
-
-static void lpuart_dma_tx_free(struct uart_port *port)
-{
- struct lpuart_port *sport = container_of(port,
- struct lpuart_port, port);
-
- dma_unmap_single(sport->port.dev, sport->dma_tx_buf_bus,
- UART_XMIT_SIZE, DMA_TO_DEVICE);
-
- sport->dma_tx_buf_bus = 0;
- sport->dma_tx_buf_virt = NULL;
-}
-
-static void lpuart_dma_rx_free(struct uart_port *port)
-{
- struct lpuart_port *sport = container_of(port,
- struct lpuart_port, port);
-
- dma_unmap_single(sport->port.dev, sport->dma_rx_buf_bus,
- FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
-
- sport->dma_rx_buf_bus = 0;
- sport->dma_rx_buf_virt = NULL;
+ setup_timer(&sport->lpuart_timer, lpuart_timer_func,
+ (unsigned long)sport);
+ sport->lpuart_timer.expires = jiffies + sport->dma_rx_timeout;
+ add_timer(&sport->lpuart_timer);
}
static int lpuart_startup(struct uart_port *port)
@@ -1084,22 +1137,6 @@ static int lpuart_startup(struct uart_port *port)
sport->rxfifo_size = 0x1 << (((temp >> UARTPFIFO_RXSIZE_OFF) &
UARTPFIFO_FIFOSIZE_MASK) + 1);
- if (sport->dma_rx_chan && !lpuart_dma_rx_request(port)) {
- sport->lpuart_dma_rx_use = true;
- setup_timer(&sport->lpuart_timer, lpuart_timer_func,
- (unsigned long)sport);
- } else
- sport->lpuart_dma_rx_use = false;
-
-
- if (sport->dma_tx_chan && !lpuart_dma_tx_request(port)) {
- sport->lpuart_dma_tx_use = true;
- temp = readb(port->membase + UARTCR5);
- temp &= ~UARTCR5_RDMAS;
- writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);
- } else
- sport->lpuart_dma_tx_use = false;
-
ret = devm_request_irq(port->dev, port->irq, lpuart_int, 0,
DRIVER_NAME, sport);
if (ret)
@@ -1113,7 +1150,29 @@ static int lpuart_startup(struct uart_port *port)
temp |= (UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE);
writeb(temp, sport->port.membase + UARTCR2);
+ if (sport->dma_rx_chan && !lpuart_start_rx_dma(sport)) {
+ /* set Rx DMA timeout */
+ sport->dma_rx_timeout = msecs_to_jiffies(DMA_RX_TIMEOUT);
+ if (!sport->dma_rx_timeout)
+ sport->dma_rx_timeout = 1;
+
+ sport->lpuart_dma_rx_use = true;
+ rx_dma_timer_init(sport);
+ } else {
+ sport->lpuart_dma_rx_use = false;
+ }
+
+ if (sport->dma_tx_chan && !lpuart_dma_tx_request(port)) {
+ init_waitqueue_head(&sport->dma_wait);
+ sport->lpuart_dma_tx_use = true;
+ temp = readb(port->membase + UARTCR5);
+ writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);
+ } else {
+ sport->lpuart_dma_tx_use = false;
+ }
+
spin_unlock_irqrestore(&sport->port.lock, flags);
+
return 0;
}
@@ -1170,12 +1229,19 @@ static void lpuart_shutdown(struct uart_port *port)
devm_free_irq(port->dev, port->irq, sport);
if (sport->lpuart_dma_rx_use) {
- lpuart_dma_rx_free(&sport->port);
del_timer_sync(&sport->lpuart_timer);
+ lpuart_dma_rx_free(&sport->port);
}
- if (sport->lpuart_dma_tx_use)
- lpuart_dma_tx_free(&sport->port);
+ if (sport->lpuart_dma_tx_use) {
+ if (wait_event_interruptible(sport->dma_wait,
+ !sport->dma_tx_in_progress) != false) {
+ sport->dma_tx_in_progress = false;
+ dmaengine_terminate_all(sport->dma_tx_chan);
+ }
+
+ lpuart_stop_tx(port);
+ }
}
static void lpuart32_shutdown(struct uart_port *port)
@@ -1203,13 +1269,14 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
unsigned long flags;
- unsigned char cr1, old_cr1, old_cr2, cr4, bdh, modem;
+ unsigned char cr1, old_cr1, old_cr2, cr3, cr4, bdh, modem;
unsigned int baud;
unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
unsigned int sbr, brfa;
cr1 = old_cr1 = readb(sport->port.membase + UARTCR1);
old_cr2 = readb(sport->port.membase + UARTCR2);
+ cr3 = readb(sport->port.membase + UARTCR3);
cr4 = readb(sport->port.membase + UARTCR4);
bdh = readb(sport->port.membase + UARTBDH);
modem = readb(sport->port.membase + UARTMODEM);
@@ -1240,6 +1307,13 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
cr1 |= UARTCR1_M;
}
+ /*
+ * When auto RS-485 RTS mode is enabled,
+ * hardware flow control need to be disabled.
+ */
+ if (sport->port.rs485.flags & SER_RS485_ENABLED)
+ termios->c_cflag &= ~CRTSCTS;
+
if (termios->c_cflag & CRTSCTS) {
modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
} else {
@@ -1257,7 +1331,10 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
if ((termios->c_cflag & PARENB)) {
if (termios->c_cflag & CMSPAR) {
cr1 &= ~UARTCR1_PE;
- cr1 |= UARTCR1_M;
+ if (termios->c_cflag & PARODD)
+ cr3 |= UARTCR3_T8;
+ else
+ cr3 &= ~UARTCR3_T8;
} else {
cr1 |= UARTCR1_PE;
if ((termios->c_cflag & CSIZE) == CS8)
@@ -1297,17 +1374,6 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
/* update the per-port timeout */
uart_update_timeout(port, termios->c_cflag, baud);
- if (sport->lpuart_dma_rx_use) {
- /* Calculate delay for 1.5 DMA buffers */
- sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) *
- FSL_UART_RX_DMA_BUFFER_SIZE * 3 /
- sport->rxfifo_size / 2;
- dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n",
- sport->dma_rx_timeout * 1000 / HZ, sport->port.timeout);
- if (sport->dma_rx_timeout < msecs_to_jiffies(20))
- sport->dma_rx_timeout = msecs_to_jiffies(20);
- }
-
/* wait transmit engin complete */
while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
barrier();
@@ -1325,12 +1391,31 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
writeb(cr4 | brfa, sport->port.membase + UARTCR4);
writeb(bdh, sport->port.membase + UARTBDH);
writeb(sbr & 0xFF, sport->port.membase + UARTBDL);
+ writeb(cr3, sport->port.membase + UARTCR3);
writeb(cr1, sport->port.membase + UARTCR1);
writeb(modem, sport->port.membase + UARTMODEM);
/* restore control register */
writeb(old_cr2, sport->port.membase + UARTCR2);
+ /*
+ * If new baud rate is set, we will also need to update the Ring buffer
+ * length according to the selected baud rate and restart Rx DMA path.
+ */
+ if (old) {
+ if (sport->lpuart_dma_rx_use) {
+ del_timer_sync(&sport->lpuart_timer);
+ lpuart_dma_rx_free(&sport->port);
+ }
+
+ if (sport->dma_rx_chan && !lpuart_start_rx_dma(sport)) {
+ sport->lpuart_dma_rx_use = true;
+ rx_dma_timer_init(sport);
+ } else {
+ sport->lpuart_dma_rx_use = false;
+ }
+ }
+
spin_unlock_irqrestore(&sport->port.lock, flags);
}
@@ -1494,7 +1579,7 @@ static int lpuart_verify_port(struct uart_port *port, struct serial_struct *ser)
return ret;
}
-static struct uart_ops lpuart_pops = {
+static const struct uart_ops lpuart_pops = {
.tx_empty = lpuart_tx_empty,
.set_mctrl = lpuart_set_mctrl,
.get_mctrl = lpuart_get_mctrl,
@@ -1513,7 +1598,7 @@ static struct uart_ops lpuart_pops = {
.flush_buffer = lpuart_flush_buffer,
};
-static struct uart_ops lpuart32_pops = {
+static const struct uart_ops lpuart32_pops = {
.tx_empty = lpuart32_tx_empty,
.set_mctrl = lpuart32_set_mctrl,
.get_mctrl = lpuart32_get_mctrl,
@@ -1843,6 +1928,8 @@ static int lpuart_probe(struct platform_device *pdev)
sport->port.ops = &lpuart_pops;
sport->port.flags = UPF_BOOT_AUTOCONF;
+ sport->port.rs485_config = lpuart_config_rs485;
+
sport->clk = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(sport->clk)) {
ret = PTR_ERR(sport->clk);
@@ -1883,6 +1970,12 @@ static int lpuart_probe(struct platform_device *pdev)
dev_info(sport->port.dev, "DMA rx channel request failed, "
"operating without rx DMA\n");
+ if (of_property_read_bool(np, "linux,rs485-enabled-at-boot-time")) {
+ sport->port.rs485.flags |= SER_RS485_ENABLED;
+ sport->port.rs485.flags |= SER_RS485_RTS_ON_SEND;
+ writeb(UARTMODEM_TXRTSE, sport->port.membase + UARTMODEM);
+ }
+
return 0;
}
@@ -1923,6 +2016,32 @@ static int lpuart_suspend(struct device *dev)
uart_suspend_port(&lpuart_reg, &sport->port);
+ if (sport->lpuart_dma_rx_use) {
+ /*
+ * EDMA driver during suspend will forcefully release any
+ * non-idle DMA channels. If port wakeup is enabled or if port
+ * is console port or 'no_console_suspend' is set the Rx DMA
+ * cannot resume as as expected, hence gracefully release the
+ * Rx DMA path before suspend and start Rx DMA path on resume.
+ */
+ if (sport->port.irq_wake) {
+ del_timer_sync(&sport->lpuart_timer);
+ lpuart_dma_rx_free(&sport->port);
+ }
+
+ /* Disable Rx DMA to use UART port as wakeup source */
+ writeb(readb(sport->port.membase + UARTCR5) & ~UARTCR5_RDMAS,
+ sport->port.membase + UARTCR5);
+ }
+
+ if (sport->lpuart_dma_tx_use) {
+ sport->dma_tx_in_progress = false;
+ dmaengine_terminate_all(sport->dma_tx_chan);
+ }
+
+ if (sport->port.suspended && !sport->port.irq_wake)
+ clk_disable_unprepare(sport->clk);
+
return 0;
}
@@ -1931,6 +2050,9 @@ static int lpuart_resume(struct device *dev)
struct lpuart_port *sport = dev_get_drvdata(dev);
unsigned long temp;
+ if (sport->port.suspended && !sport->port.irq_wake)
+ clk_prepare_enable(sport->clk);
+
if (sport->lpuart32) {
lpuart32_setup_watermark(sport);
temp = lpuart32_read(sport->port.membase + UARTCTRL);
@@ -1944,6 +2066,26 @@ static int lpuart_resume(struct device *dev)
writeb(temp, sport->port.membase + UARTCR2);
}
+ if (sport->lpuart_dma_rx_use) {
+ if (sport->port.irq_wake) {
+ if (!lpuart_start_rx_dma(sport)) {
+ sport->lpuart_dma_rx_use = true;
+ rx_dma_timer_init(sport);
+ } else {
+ sport->lpuart_dma_rx_use = false;
+ }
+ }
+ }
+
+ if (sport->dma_tx_chan && !lpuart_dma_tx_request(&sport->port)) {
+ init_waitqueue_head(&sport->dma_wait);
+ sport->lpuart_dma_tx_use = true;
+ writeb(readb(sport->port.membase + UARTCR5) |
+ UARTCR5_TDMAS, sport->port.membase + UARTCR5);
+ } else {
+ sport->lpuart_dma_tx_use = false;
+ }
+
uart_resume_port(&lpuart_reg, &sport->port);
return 0;
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 0df2b1c091ae..a70356dad1b7 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -190,6 +190,7 @@
enum imx_uart_type {
IMX1_UART,
IMX21_UART,
+ IMX53_UART,
IMX6Q_UART,
};
@@ -222,6 +223,9 @@ struct imx_port {
struct dma_chan *dma_chan_rx, *dma_chan_tx;
struct scatterlist rx_sgl, tx_sgl[2];
void *rx_buf;
+ struct circ_buf rx_ring;
+ unsigned int rx_periods;
+ dma_cookie_t rx_cookie;
unsigned int tx_bytes;
unsigned int dma_tx_nents;
wait_queue_head_t dma_wait;
@@ -244,6 +248,10 @@ static struct imx_uart_data imx_uart_devdata[] = {
.uts_reg = IMX21_UTS,
.devtype = IMX21_UART,
},
+ [IMX53_UART] = {
+ .uts_reg = IMX21_UTS,
+ .devtype = IMX53_UART,
+ },
[IMX6Q_UART] = {
.uts_reg = IMX21_UTS,
.devtype = IMX6Q_UART,
@@ -258,6 +266,9 @@ static const struct platform_device_id imx_uart_devtype[] = {
.name = "imx21-uart",
.driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX21_UART],
}, {
+ .name = "imx53-uart",
+ .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX53_UART],
+ }, {
.name = "imx6q-uart",
.driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX6Q_UART],
}, {
@@ -268,6 +279,7 @@ MODULE_DEVICE_TABLE(platform, imx_uart_devtype);
static const struct of_device_id imx_uart_dt_ids[] = {
{ .compatible = "fsl,imx6q-uart", .data = &imx_uart_devdata[IMX6Q_UART], },
+ { .compatible = "fsl,imx53-uart", .data = &imx_uart_devdata[IMX53_UART], },
{ .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], },
{ .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX21_UART], },
{ /* sentinel */ }
@@ -289,6 +301,11 @@ static inline int is_imx21_uart(struct imx_port *sport)
return sport->devdata->devtype == IMX21_UART;
}
+static inline int is_imx53_uart(struct imx_port *sport)
+{
+ return sport->devdata->devtype == IMX53_UART;
+}
+
static inline int is_imx6q_uart(struct imx_port *sport)
{
return sport->devdata->devtype == IMX6Q_UART;
@@ -701,6 +718,7 @@ out:
return IRQ_HANDLED;
}
+static void clear_rx_errors(struct imx_port *sport);
static int start_rx_dma(struct imx_port *sport);
/*
* If the RXFIFO is filled with some data, and then we
@@ -726,6 +744,11 @@ static void imx_dma_rxint(struct imx_port *sport)
temp &= ~(UCR2_ATEN);
writel(temp, sport->port.membase + UCR2);
+ /* disable the rx errors interrupts */
+ temp = readl(sport->port.membase + UCR4);
+ temp &= ~UCR4_OREN;
+ writel(temp, sport->port.membase + UCR4);
+
/* tell the DMA to receive the data. */
start_rx_dma(sport);
}
@@ -740,12 +763,13 @@ static unsigned int imx_get_hwmctrl(struct imx_port *sport)
{
unsigned int tmp = TIOCM_DSR;
unsigned usr1 = readl(sport->port.membase + USR1);
+ unsigned usr2 = readl(sport->port.membase + USR2);
if (usr1 & USR1_RTSS)
tmp |= TIOCM_CTS;
/* in DCE mode DCDIN is always 0 */
- if (!(usr1 & USR2_DCDIN))
+ if (!(usr2 & USR2_DCDIN))
tmp |= TIOCM_CAR;
if (sport->dte_mode)
@@ -932,30 +956,6 @@ static void imx_timeout(unsigned long data)
}
#define RX_BUF_SIZE (PAGE_SIZE)
-static void imx_rx_dma_done(struct imx_port *sport)
-{
- unsigned long temp;
- unsigned long flags;
-
- spin_lock_irqsave(&sport->port.lock, flags);
-
- /* re-enable interrupts to get notified when new symbols are incoming */
- temp = readl(sport->port.membase + UCR1);
- temp |= UCR1_RRDYEN;
- writel(temp, sport->port.membase + UCR1);
-
- temp = readl(sport->port.membase + UCR2);
- temp |= UCR2_ATEN;
- writel(temp, sport->port.membase + UCR2);
-
- sport->dma_is_rxing = 0;
-
- /* Is the shutdown waiting for us? */
- if (waitqueue_active(&sport->dma_wait))
- wake_up(&sport->dma_wait);
-
- spin_unlock_irqrestore(&sport->port.lock, flags);
-}
/*
* There are two kinds of RX DMA interrupts(such as in the MX6Q):
@@ -972,43 +972,76 @@ static void dma_rx_callback(void *data)
struct scatterlist *sgl = &sport->rx_sgl;
struct tty_port *port = &sport->port.state->port;
struct dma_tx_state state;
+ struct circ_buf *rx_ring = &sport->rx_ring;
enum dma_status status;
- unsigned int count;
-
- /* unmap it first */
- dma_unmap_sg(sport->port.dev, sgl, 1, DMA_FROM_DEVICE);
+ unsigned int w_bytes = 0;
+ unsigned int r_bytes;
+ unsigned int bd_size;
status = dmaengine_tx_status(chan, (dma_cookie_t)0, &state);
- count = RX_BUF_SIZE - state.residue;
- dev_dbg(sport->port.dev, "We get %d bytes.\n", count);
+ if (status == DMA_ERROR) {
+ dev_err(sport->port.dev, "DMA transaction error.\n");
+ clear_rx_errors(sport);
+ return;
+ }
+
+ if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) {
+
+ /*
+ * The state-residue variable represents the empty space
+ * relative to the entire buffer. Taking this in consideration
+ * the head is always calculated base on the buffer total
+ * length - DMA transaction residue. The UART script from the
+ * SDMA firmware will jump to the next buffer descriptor,
+ * once a DMA transaction if finalized (IMX53 RM - A.4.1.2.4).
+ * Taking this in consideration the tail is always at the
+ * beginning of the buffer descriptor that contains the head.
+ */
+
+ /* Calculate the head */
+ rx_ring->head = sg_dma_len(sgl) - state.residue;
+
+ /* Calculate the tail. */
+ bd_size = sg_dma_len(sgl) / sport->rx_periods;
+ rx_ring->tail = ((rx_ring->head-1) / bd_size) * bd_size;
+
+ if (rx_ring->head <= sg_dma_len(sgl) &&
+ rx_ring->head > rx_ring->tail) {
+
+ /* Move data from tail to head */
+ r_bytes = rx_ring->head - rx_ring->tail;
- if (count) {
- if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) {
- int bytes = tty_insert_flip_string(port, sport->rx_buf,
- count);
+ /* CPU claims ownership of RX DMA buffer */
+ dma_sync_sg_for_cpu(sport->port.dev, sgl, 1,
+ DMA_FROM_DEVICE);
- if (bytes != count)
+ w_bytes = tty_insert_flip_string(port,
+ sport->rx_buf + rx_ring->tail, r_bytes);
+
+ /* UART retrieves ownership of RX DMA buffer */
+ dma_sync_sg_for_device(sport->port.dev, sgl, 1,
+ DMA_FROM_DEVICE);
+
+ if (w_bytes != r_bytes)
sport->port.icount.buf_overrun++;
+
+ sport->port.icount.rx += w_bytes;
+ } else {
+ WARN_ON(rx_ring->head > sg_dma_len(sgl));
+ WARN_ON(rx_ring->head <= rx_ring->tail);
}
- tty_flip_buffer_push(port);
- sport->port.icount.rx += count;
}
- /*
- * Restart RX DMA directly if more data is available in order to skip
- * the roundtrip through the IRQ handler. If there is some data already
- * in the FIFO, DMA needs to be restarted soon anyways.
- *
- * Otherwise stop the DMA and reactivate FIFO IRQs to restart DMA once
- * data starts to arrive again.
- */
- if (readl(sport->port.membase + USR2) & USR2_RDR)
- start_rx_dma(sport);
- else
- imx_rx_dma_done(sport);
+ if (w_bytes) {
+ tty_flip_buffer_push(port);
+ dev_dbg(sport->port.dev, "We get %d bytes.\n", w_bytes);
+ }
}
+/* RX DMA buffer periods */
+#define RX_DMA_PERIODS 4
+
static int start_rx_dma(struct imx_port *sport)
{
struct scatterlist *sgl = &sport->rx_sgl;
@@ -1017,14 +1050,21 @@ static int start_rx_dma(struct imx_port *sport)
struct dma_async_tx_descriptor *desc;
int ret;
+ sport->rx_ring.head = 0;
+ sport->rx_ring.tail = 0;
+ sport->rx_periods = RX_DMA_PERIODS;
+
sg_init_one(sgl, sport->rx_buf, RX_BUF_SIZE);
ret = dma_map_sg(dev, sgl, 1, DMA_FROM_DEVICE);
if (ret == 0) {
dev_err(dev, "DMA mapping error for RX.\n");
return -EINVAL;
}
- desc = dmaengine_prep_slave_sg(chan, sgl, 1, DMA_DEV_TO_MEM,
- DMA_PREP_INTERRUPT);
+
+ desc = dmaengine_prep_dma_cyclic(chan, sg_dma_address(sgl),
+ sg_dma_len(sgl), sg_dma_len(sgl) / sport->rx_periods,
+ DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
+
if (!desc) {
dma_unmap_sg(dev, sgl, 1, DMA_FROM_DEVICE);
dev_err(dev, "We cannot prepare for the RX slave dma!\n");
@@ -1034,11 +1074,36 @@ static int start_rx_dma(struct imx_port *sport)
desc->callback_param = sport;
dev_dbg(dev, "RX: prepare for the DMA.\n");
- dmaengine_submit(desc);
+ sport->rx_cookie = dmaengine_submit(desc);
dma_async_issue_pending(chan);
return 0;
}
+static void clear_rx_errors(struct imx_port *sport)
+{
+ unsigned int status_usr1, status_usr2;
+
+ status_usr1 = readl(sport->port.membase + USR1);
+ status_usr2 = readl(sport->port.membase + USR2);
+
+ if (status_usr2 & USR2_BRCD) {
+ sport->port.icount.brk++;
+ writel(USR2_BRCD, sport->port.membase + USR2);
+ } else if (status_usr1 & USR1_FRAMERR) {
+ sport->port.icount.frame++;
+ writel(USR1_FRAMERR, sport->port.membase + USR1);
+ } else if (status_usr1 & USR1_PARITYERR) {
+ sport->port.icount.parity++;
+ writel(USR1_PARITYERR, sport->port.membase + USR1);
+ }
+
+ if (status_usr2 & USR2_ORE) {
+ sport->port.icount.overrun++;
+ writel(USR2_ORE, sport->port.membase + USR2);
+ }
+
+}
+
#define TXTL_DEFAULT 2 /* reset default */
#define RXTL_DEFAULT 1 /* reset default */
#define TXTL_DMA 8 /* DMA burst setting */
@@ -1058,14 +1123,16 @@ static void imx_setup_ufcr(struct imx_port *sport,
static void imx_uart_dma_exit(struct imx_port *sport)
{
if (sport->dma_chan_rx) {
+ dmaengine_terminate_sync(sport->dma_chan_rx);
dma_release_channel(sport->dma_chan_rx);
sport->dma_chan_rx = NULL;
-
+ sport->rx_cookie = -EINVAL;
kfree(sport->rx_buf);
sport->rx_buf = NULL;
}
if (sport->dma_chan_tx) {
+ dmaengine_terminate_sync(sport->dma_chan_tx);
dma_release_channel(sport->dma_chan_tx);
sport->dma_chan_tx = NULL;
}
@@ -1103,6 +1170,7 @@ static int imx_uart_dma_init(struct imx_port *sport)
ret = -ENOMEM;
goto err;
}
+ sport->rx_ring.buf = sport->rx_buf;
/* Prepare for TX : */
sport->dma_chan_tx = dma_request_slave_channel(dev, "tx");
@@ -1201,8 +1269,7 @@ static int imx_startup(struct uart_port *port)
writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
/* Can we enable the DMA support? */
- if (is_imx6q_uart(sport) && !uart_console(port) &&
- !sport->dma_is_inited)
+ if (!uart_console(port) && !sport->dma_is_inited)
imx_uart_dma_init(sport);
spin_lock_irqsave(&sport->port.lock, flags);
@@ -1283,17 +1350,11 @@ static void imx_shutdown(struct uart_port *port)
unsigned long flags;
if (sport->dma_is_enabled) {
- int ret;
+ sport->dma_is_rxing = 0;
+ sport->dma_is_txing = 0;
+ dmaengine_terminate_sync(sport->dma_chan_tx);
+ dmaengine_terminate_sync(sport->dma_chan_rx);
- /* We have to wait for the DMA to finish. */
- ret = wait_event_interruptible(sport->dma_wait,
- !sport->dma_is_rxing && !sport->dma_is_txing);
- if (ret != 0) {
- sport->dma_is_rxing = 0;
- sport->dma_is_txing = 0;
- dmaengine_terminate_all(sport->dma_chan_tx);
- dmaengine_terminate_all(sport->dma_chan_rx);
- }
spin_lock_irqsave(&sport->port.lock, flags);
imx_stop_tx(port);
imx_stop_rx(port);
@@ -1690,7 +1751,7 @@ static int imx_rs485_config(struct uart_port *port,
return 0;
}
-static struct uart_ops imx_pops = {
+static const struct uart_ops imx_pops = {
.tx_empty = imx_tx_empty,
.set_mctrl = imx_set_mctrl,
.get_mctrl = imx_get_mctrl,
@@ -2077,8 +2138,10 @@ static int serial_imx_probe(struct platform_device *pdev)
/* For register access, we only need to enable the ipg clock. */
ret = clk_prepare_enable(sport->clk_ipg);
- if (ret)
+ if (ret) {
+ dev_err(&pdev->dev, "failed to enable per clk: %d\n", ret);
return ret;
+ }
/* Disable interrupts before requesting them */
reg = readl_relaxed(sport->port.membase + UCR1);
@@ -2095,18 +2158,26 @@ static int serial_imx_probe(struct platform_device *pdev)
if (txirq > 0) {
ret = devm_request_irq(&pdev->dev, rxirq, imx_rxint, 0,
dev_name(&pdev->dev), sport);
- if (ret)
+ if (ret) {
+ dev_err(&pdev->dev, "failed to request rx irq: %d\n",
+ ret);
return ret;
+ }
ret = devm_request_irq(&pdev->dev, txirq, imx_txint, 0,
dev_name(&pdev->dev), sport);
- if (ret)
+ if (ret) {
+ dev_err(&pdev->dev, "failed to request tx irq: %d\n",
+ ret);
return ret;
+ }
} else {
ret = devm_request_irq(&pdev->dev, rxirq, imx_int, 0,
dev_name(&pdev->dev), sport);
- if (ret)
+ if (ret) {
+ dev_err(&pdev->dev, "failed to request irq: %d\n", ret);
return ret;
+ }
}
imx_ports[sport->port.line] = sport;
diff --git a/drivers/tty/serial/jsm/jsm_tty.c b/drivers/tty/serial/jsm/jsm_tty.c
index c5ddfe542451..ec7d8383900f 100644
--- a/drivers/tty/serial/jsm/jsm_tty.c
+++ b/drivers/tty/serial/jsm/jsm_tty.c
@@ -346,7 +346,7 @@ static void jsm_config_port(struct uart_port *port, int flags)
port->type = PORT_JSM;
}
-static struct uart_ops jsm_ops = {
+static const struct uart_ops jsm_ops = {
.tx_empty = jsm_tty_tx_empty,
.set_mctrl = jsm_tty_set_mctrl,
.get_mctrl = jsm_tty_get_mctrl,
diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c
index 5c4c280b3207..ace82645b123 100644
--- a/drivers/tty/serial/max3100.c
+++ b/drivers/tty/serial/max3100.c
@@ -712,7 +712,7 @@ static void max3100_break_ctl(struct uart_port *port, int break_state)
dev_dbg(&s->spi->dev, "%s\n", __func__);
}
-static struct uart_ops max3100_ops = {
+static const struct uart_ops max3100_ops = {
.tx_empty = max3100_tx_empty,
.set_mctrl = max3100_set_mctrl,
.get_mctrl = max3100_get_mctrl,
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index 9360801df3c4..8a3e92638e10 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1329,9 +1329,9 @@ static int max310x_spi_probe(struct spi_device *spi)
const struct spi_device_id *id_entry = spi_get_device_id(spi);
devtype = (struct max310x_devtype *)id_entry->driver_data;
- flags = IRQF_TRIGGER_FALLING;
}
+ flags = IRQF_TRIGGER_FALLING;
regcfg.max_register = devtype->nr * 0x20 - 1;
regmap = devm_regmap_init_spi(spi, &regcfg);
diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
index a44290e9b5a8..e72ea61c70db 100644
--- a/drivers/tty/serial/men_z135_uart.c
+++ b/drivers/tty/serial/men_z135_uart.c
@@ -775,7 +775,7 @@ static int men_z135_verify_port(struct uart_port *port,
return -EINVAL;
}
-static struct uart_ops men_z135_ops = {
+static const struct uart_ops men_z135_ops = {
.tx_empty = men_z135_tx_empty,
.set_mctrl = men_z135_set_mctrl,
.get_mctrl = men_z135_get_mctrl,
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index eb54e5c77ead..770454e0dfa3 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1317,7 +1317,7 @@ static void mxs_auart_break_ctl(struct uart_port *u, int ctl)
mxs_clr(AUART_LINECTRL_BRK, s, REG_LINECTRL);
}
-static struct uart_ops mxs_auart_ops = {
+static const struct uart_ops mxs_auart_ops = {
.tx_empty = mxs_auart_tx_empty,
.start_tx = mxs_auart_start_tx,
.stop_tx = mxs_auart_stop_tx,
@@ -1510,10 +1510,7 @@ static int mxs_get_clks(struct mxs_auart_port *s,
if (!is_asm9260_auart(s)) {
s->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(s->clk))
- return PTR_ERR(s->clk);
-
- return 0;
+ return PTR_ERR_OR_ZERO(s->clk);
}
s->clk = devm_clk_get(s->dev, "mod");
@@ -1537,16 +1534,20 @@ static int mxs_get_clks(struct mxs_auart_port *s,
err = clk_set_rate(s->clk, clk_get_rate(s->clk_ahb));
if (err) {
dev_err(s->dev, "Failed to set rate!\n");
- return err;
+ goto disable_clk_ahb;
}
err = clk_prepare_enable(s->clk);
if (err) {
dev_err(s->dev, "Failed to enable clk!\n");
- return err;
+ goto disable_clk_ahb;
}
return 0;
+
+disable_clk_ahb:
+ clk_disable_unprepare(s->clk_ahb);
+ return err;
}
/*
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index ea4ffc2ebb2f..d391650b82e7 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -31,6 +31,7 @@
#include <linux/dmi.h>
#include <linux/nmi.h>
#include <linux/delay.h>
+#include <linux/of.h>
#include <linux/debugfs.h>
#include <linux/dmaengine.h>
@@ -1603,7 +1604,7 @@ static void pch_uart_put_poll_char(struct uart_port *port,
}
#endif /* CONFIG_CONSOLE_POLL */
-static struct uart_ops pch_uart_ops = {
+static const struct uart_ops pch_uart_ops = {
.tx_empty = pch_uart_tx_empty,
.set_mctrl = pch_uart_set_mctrl,
.get_mctrl = pch_uart_get_mctrl,
@@ -1826,6 +1827,10 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
priv->trigger_level = 1;
priv->fcr = 0;
+ if (pdev->dev.of_node)
+ of_property_read_u32(pdev->dev.of_node, "clock-frequency"
+ , &user_uartclk);
+
#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
pch_uart_ports[board->line_no] = priv;
#endif
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index ae2095a66708..f44615fa474d 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -1577,7 +1577,7 @@ static void s3c24xx_serial_resetport(struct uart_port *port,
}
-#ifdef CONFIG_CPU_FREQ
+#ifdef CONFIG_ARM_S3C24XX_CPUFREQ
static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
unsigned long val, void *data)
diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h
index 2ae4fcee1814..a04acef1cb20 100644
--- a/drivers/tty/serial/samsung.h
+++ b/drivers/tty/serial/samsung.h
@@ -102,7 +102,7 @@ struct s3c24xx_uart_port {
struct s3c24xx_uart_dma *dma;
-#ifdef CONFIG_CPU_FREQ
+#ifdef CONFIG_ARM_S3C24XX_CPUFREQ
struct notifier_block freq_transition;
#endif
};
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index f36e6df2fa90..a9d94f7cf683 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1205,6 +1205,10 @@ static int sc16is7xx_probe(struct device *dev,
}
#endif
+ /* reset device, purging any pending irq / data */
+ regmap_write(s->regmap, SC16IS7XX_IOCONTROL_REG << SC16IS7XX_REG_SHIFT,
+ SC16IS7XX_IOCONTROL_SRESET_BIT);
+
for (i = 0; i < devtype->nr_uart; ++i) {
s->p[i].line = i;
/* Initialize port data */
@@ -1234,6 +1238,22 @@ static int sc16is7xx_probe(struct device *dev,
init_kthread_work(&s->p[i].reg_work, sc16is7xx_reg_proc);
/* Register port */
uart_add_one_port(&sc16is7xx_uart, &s->p[i].port);
+
+ /* Enable EFR */
+ sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_LCR_REG,
+ SC16IS7XX_LCR_CONF_MODE_B);
+
+ regcache_cache_bypass(s->regmap, true);
+
+ /* Enable write access to enhanced features */
+ sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_EFR_REG,
+ SC16IS7XX_EFR_ENABLE_BIT);
+
+ regcache_cache_bypass(s->regmap, false);
+
+ /* Restore access to general registers */
+ sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_LCR_REG, 0x00);
+
/* Go to suspend mode */
sc16is7xx_power(&s->p[i].port, 0);
}
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 9fc15335c8c5..6e4f63627479 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -235,18 +235,9 @@ static int uart_startup(struct tty_struct *tty, struct uart_state *state,
if (tty_port_initialized(port))
return 0;
- /*
- * Set the TTY IO error marker - we will only clear this
- * once we have successfully opened the port.
- */
- set_bit(TTY_IO_ERROR, &tty->flags);
-
retval = uart_port_startup(tty, state, init_hw);
- if (!retval) {
- tty_port_set_initialized(port, 1);
- clear_bit(TTY_IO_ERROR, &tty->flags);
- } else if (retval > 0)
- retval = 0;
+ if (retval)
+ set_bit(TTY_IO_ERROR, &tty->flags);
return retval;
}
@@ -972,8 +963,11 @@ static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
}
uart_change_speed(tty, state, NULL);
}
- } else
+ } else {
retval = uart_startup(tty, state, 1);
+ if (retval > 0)
+ retval = 0;
+ }
exit:
return retval;
}
@@ -1139,6 +1133,8 @@ static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state)
uport->ops->config_port(uport, flags);
ret = uart_startup(tty, state, 1);
+ if (ret > 0)
+ ret = 0;
}
out:
mutex_unlock(&port->mutex);
@@ -1465,7 +1461,6 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
{
struct uart_state *state = tty->driver_data;
struct tty_port *port;
- struct uart_port *uport;
if (!state) {
struct uart_driver *drv = tty->driver->driver_state;
@@ -1481,56 +1476,36 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
port = &state->port;
pr_debug("uart_close(%d) called\n", tty->index);
- if (tty_port_close_start(port, tty, filp) == 0)
- return;
+ tty_port_close(tty->port, tty, filp);
+}
- mutex_lock(&port->mutex);
- uport = uart_port_check(state);
+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);
/*
* At this point, we stop accepting input. To do this, we
* disable the receive line status interrupts.
*/
- if (tty_port_initialized(port) &&
- !WARN(!uport, "detached port still initialized!\n")) {
- spin_lock_irq(&uport->lock);
- uport->ops->stop_rx(uport);
- spin_unlock_irq(&uport->lock);
- /*
- * Before we drop DTR, make sure the UART transmitter
- * has completely drained; this is especially
- * important if there is a transmit FIFO!
- */
- uart_wait_until_sent(tty, uport->timeout);
- }
-
- uart_shutdown(tty, state);
- tty_port_tty_set(port, NULL);
+ if (WARN(!uport, "detached port still initialized!\n"))
+ return;
- spin_lock_irq(&port->lock);
+ spin_lock_irq(&uport->lock);
+ uport->ops->stop_rx(uport);
+ spin_unlock_irq(&uport->lock);
- if (port->blocked_open) {
- spin_unlock_irq(&port->lock);
- if (port->close_delay)
- msleep_interruptible(jiffies_to_msecs(port->close_delay));
- spin_lock_irq(&port->lock);
- } else if (uport && !uart_console(uport)) {
- spin_unlock_irq(&port->lock);
- uart_change_pm(state, UART_PM_STATE_OFF);
- spin_lock_irq(&port->lock);
- }
- spin_unlock_irq(&port->lock);
- tty_port_set_active(port, 0);
+ uart_port_shutdown(port);
/*
- * Wake up anyone trying to open this port.
+ * It's possible for shutdown to be called after suspend if we get
+ * a DCD drop (hangup) at just the right time. Clear suspended bit so
+ * we don't try to resume a port that has been shutdown.
*/
- wake_up_interruptible(&port->open_wait);
+ tty_port_set_suspended(port, 0);
- mutex_unlock(&port->mutex);
+ uart_change_pm(state, UART_PM_STATE_OFF);
- tty_ldisc_flush(tty);
- tty->closing = 0;
}
static void uart_wait_until_sent(struct tty_struct *tty, int timeout)
@@ -1711,52 +1686,31 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
struct uart_driver *drv = tty->driver->driver_state;
int retval, line = tty->index;
struct uart_state *state = drv->state + line;
- struct tty_port *port = &state->port;
- struct uart_port *uport;
- pr_debug("uart_open(%d) called\n", line);
+ tty->driver_data = state;
- spin_lock_irq(&port->lock);
- ++port->count;
- spin_unlock_irq(&port->lock);
+ retval = tty_port_open(&state->port, tty, filp);
+ if (retval > 0)
+ retval = 0;
- /*
- * We take the semaphore here to guarantee that we won't be re-entered
- * while allocating the state structure, or while we request any IRQs
- * that the driver may need. This also has the nice side-effect that
- * it delays the action of uart_hangup, so we can guarantee that
- * state->port.tty will always contain something reasonable.
- */
- if (mutex_lock_interruptible(&port->mutex)) {
- retval = -ERESTARTSYS;
- goto end;
- }
+ return retval;
+}
+
+static int uart_port_activate(struct tty_port *port, struct tty_struct *tty)
+{
+ struct uart_state *state = container_of(port, struct uart_state, port);
+ struct uart_port *uport;
uport = uart_port_check(state);
- if (!uport || uport->flags & UPF_DEAD) {
- retval = -ENXIO;
- goto err_unlock;
- }
+ if (!uport || uport->flags & UPF_DEAD)
+ return -ENXIO;
- tty->driver_data = state;
- uport->state = state;
port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
- tty_port_tty_set(port, tty);
/*
* Start up the serial port.
*/
- retval = uart_startup(tty, state, 0);
-
- /*
- * If we succeeded, wait until the port is ready.
- */
-err_unlock:
- mutex_unlock(&port->mutex);
- if (retval == 0)
- retval = tty_port_block_til_ready(port, tty, filp);
-end:
- return retval;
+ return uart_startup(tty, state, 0);
}
static const char *uart_type(struct uart_port *port)
@@ -1940,7 +1894,7 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
*
* Returns 0 on success or -EINVAL on failure
*/
-int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
+int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
char **options)
{
if (strncmp(p, "mmio,", 5) == 0) {
@@ -1968,7 +1922,11 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
return -EINVAL;
}
- *addr = simple_strtoul(p, NULL, 0);
+ /*
+ * Before you replace it with kstrtoull(), think about options separator
+ * (',') it will not tolerate
+ */
+ *addr = simple_strtoull(p, NULL, 0);
p = strchr(p, ',');
if (p)
p++;
@@ -2470,6 +2428,8 @@ static const struct tty_operations uart_ops = {
static const struct tty_port_operations uart_port_ops = {
.carrier_raised = uart_carrier_raised,
.dtr_rts = uart_dtr_rts,
+ .activate = uart_port_activate,
+ .shutdown = uart_tty_port_shutdown,
};
/**
@@ -2786,6 +2746,8 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
uport->cons = drv->cons;
uport->minor = drv->tty_driver->minor_start + uport->line;
+ port->console = uart_console(uport);
+
/*
* If this port is a console, then the spinlock is already
* initialised.
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index d86eee38aae6..4b26252c2885 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2533,7 +2533,7 @@ static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
return 0;
}
-static struct uart_ops sci_uart_ops = {
+static const struct uart_ops sci_uart_ops = {
.tx_empty = sci_tx_empty,
.set_mctrl = sci_set_mctrl,
.get_mctrl = sci_get_mctrl,
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index 2d78cb3627ae..379e5bd37df9 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -639,7 +639,7 @@ static void asc_put_poll_char(struct uart_port *port, unsigned char c)
/*---------------------------------------------------------------------*/
-static struct uart_ops asc_uart_ops = {
+static const struct uart_ops asc_uart_ops = {
.tx_empty = asc_tx_empty,
.set_mctrl = asc_set_mctrl,
.get_mctrl = asc_get_mctrl,
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index f89d1f79be18..033856287ca2 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -1,6 +1,7 @@
/*
* Copyright (C) Maxime Coquelin 2015
- * Author: Maxime Coquelin <mcoquelin.stm32@gmail.com>
+ * Authors: Maxime Coquelin <mcoquelin.stm32@gmail.com>
+ * Gerald Baeza <gerald.baeza@st.com>
* License terms: GNU General Public License (GPL), version 2
*
* Inspired by st-asc.c from STMicroelectronics (c)
@@ -10,120 +11,31 @@
#define SUPPORT_SYSRQ
#endif
-#include <linux/module.h>
-#include <linux/serial.h>
+#include <linux/clk.h>
#include <linux/console.h>
-#include <linux/sysrq.h>
-#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/dma-direction.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
#include <linux/io.h>
+#include <linux/iopoll.h>
#include <linux/irq.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/delay.h>
-#include <linux/spinlock.h>
-#include <linux/pm_runtime.h>
+#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/serial_core.h>
-#include <linux/clk.h>
-
-#define DRIVER_NAME "stm32-usart"
-
-/* Register offsets */
-#define USART_SR 0x00
-#define USART_DR 0x04
-#define USART_BRR 0x08
-#define USART_CR1 0x0c
-#define USART_CR2 0x10
-#define USART_CR3 0x14
-#define USART_GTPR 0x18
-
-/* USART_SR */
-#define USART_SR_PE BIT(0)
-#define USART_SR_FE BIT(1)
-#define USART_SR_NF BIT(2)
-#define USART_SR_ORE BIT(3)
-#define USART_SR_IDLE BIT(4)
-#define USART_SR_RXNE BIT(5)
-#define USART_SR_TC BIT(6)
-#define USART_SR_TXE BIT(7)
-#define USART_SR_LBD BIT(8)
-#define USART_SR_CTS BIT(9)
-#define USART_SR_ERR_MASK (USART_SR_LBD | USART_SR_ORE | \
- USART_SR_FE | USART_SR_PE)
-/* Dummy bits */
-#define USART_SR_DUMMY_RX BIT(16)
-
-/* USART_DR */
-#define USART_DR_MASK GENMASK(8, 0)
-
-/* USART_BRR */
-#define USART_BRR_DIV_F_MASK GENMASK(3, 0)
-#define USART_BRR_DIV_M_MASK GENMASK(15, 4)
-#define USART_BRR_DIV_M_SHIFT 4
-
-/* USART_CR1 */
-#define USART_CR1_SBK BIT(0)
-#define USART_CR1_RWU BIT(1)
-#define USART_CR1_RE BIT(2)
-#define USART_CR1_TE BIT(3)
-#define USART_CR1_IDLEIE BIT(4)
-#define USART_CR1_RXNEIE BIT(5)
-#define USART_CR1_TCIE BIT(6)
-#define USART_CR1_TXEIE BIT(7)
-#define USART_CR1_PEIE BIT(8)
-#define USART_CR1_PS BIT(9)
-#define USART_CR1_PCE BIT(10)
-#define USART_CR1_WAKE BIT(11)
-#define USART_CR1_M BIT(12)
-#define USART_CR1_UE BIT(13)
-#define USART_CR1_OVER8 BIT(15)
-#define USART_CR1_IE_MASK GENMASK(8, 4)
-
-/* USART_CR2 */
-#define USART_CR2_ADD_MASK GENMASK(3, 0)
-#define USART_CR2_LBDL BIT(5)
-#define USART_CR2_LBDIE BIT(6)
-#define USART_CR2_LBCL BIT(8)
-#define USART_CR2_CPHA BIT(9)
-#define USART_CR2_CPOL BIT(10)
-#define USART_CR2_CLKEN BIT(11)
-#define USART_CR2_STOP_2B BIT(13)
-#define USART_CR2_STOP_MASK GENMASK(13, 12)
-#define USART_CR2_LINEN BIT(14)
-
-/* USART_CR3 */
-#define USART_CR3_EIE BIT(0)
-#define USART_CR3_IREN BIT(1)
-#define USART_CR3_IRLP BIT(2)
-#define USART_CR3_HDSEL BIT(3)
-#define USART_CR3_NACK BIT(4)
-#define USART_CR3_SCEN BIT(5)
-#define USART_CR3_DMAR BIT(6)
-#define USART_CR3_DMAT BIT(7)
-#define USART_CR3_RTSE BIT(8)
-#define USART_CR3_CTSE BIT(9)
-#define USART_CR3_CTSIE BIT(10)
-#define USART_CR3_ONEBIT BIT(11)
-
-/* USART_GTPR */
-#define USART_GTPR_PSC_MASK GENMASK(7, 0)
-#define USART_GTPR_GT_MASK GENMASK(15, 8)
-
-#define DRIVER_NAME "stm32-usart"
-#define STM32_SERIAL_NAME "ttyS"
-#define STM32_MAX_PORTS 6
-
-struct stm32_port {
- struct uart_port port;
- struct clk *clk;
- bool hw_flow_control;
-};
+#include <linux/serial.h>
+#include <linux/spinlock.h>
+#include <linux/sysrq.h>
+#include <linux/tty_flip.h>
+#include <linux/tty.h>
-static struct stm32_port stm32_ports[STM32_MAX_PORTS];
-static struct uart_driver stm32_usart_driver;
+#include "stm32-usart.h"
static void stm32_stop_tx(struct uart_port *port);
+static void stm32_transmit_chars(struct uart_port *port);
static inline struct stm32_port *to_stm32_port(struct uart_port *port)
{
@@ -148,19 +60,64 @@ static void stm32_clr_bits(struct uart_port *port, u32 reg, u32 bits)
writel_relaxed(val, port->membase + reg);
}
-static void stm32_receive_chars(struct uart_port *port)
+static int stm32_pending_rx(struct uart_port *port, u32 *sr, int *last_res,
+ bool threaded)
+{
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+ enum dma_status status;
+ struct dma_tx_state state;
+
+ *sr = readl_relaxed(port->membase + ofs->isr);
+
+ if (threaded && stm32_port->rx_ch) {
+ status = dmaengine_tx_status(stm32_port->rx_ch,
+ stm32_port->rx_ch->cookie,
+ &state);
+ if ((status == DMA_IN_PROGRESS) &&
+ (*last_res != state.residue))
+ return 1;
+ else
+ return 0;
+ } else if (*sr & USART_SR_RXNE) {
+ return 1;
+ }
+ return 0;
+}
+
+static unsigned long
+stm32_get_char(struct uart_port *port, u32 *sr, int *last_res)
+{
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+ unsigned long c;
+
+ if (stm32_port->rx_ch) {
+ c = stm32_port->rx_buf[RX_BUF_L - (*last_res)--];
+ if ((*last_res) == 0)
+ *last_res = RX_BUF_L;
+ return c;
+ } else {
+ return readl_relaxed(port->membase + ofs->rdr);
+ }
+}
+
+static void stm32_receive_chars(struct uart_port *port, bool threaded)
{
struct tty_port *tport = &port->state->port;
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long c;
u32 sr;
char flag;
+ static int last_res = RX_BUF_L;
if (port->irq_wake)
pm_wakeup_event(tport->tty->dev, 0);
- while ((sr = readl_relaxed(port->membase + USART_SR)) & USART_SR_RXNE) {
+ while (stm32_pending_rx(port, &sr, &last_res, threaded)) {
sr |= USART_SR_DUMMY_RX;
- c = readl_relaxed(port->membase + USART_DR);
+ c = stm32_get_char(port, &sr, &last_res);
flag = TTY_NORMAL;
port->icount.rx++;
@@ -170,6 +127,10 @@ static void stm32_receive_chars(struct uart_port *port)
if (uart_handle_break(port))
continue;
} else if (sr & USART_SR_ORE) {
+ if (ofs->icr != UNDEF_REG)
+ writel_relaxed(USART_ICR_ORECF,
+ port->membase +
+ ofs->icr);
port->icount.overrun++;
} else if (sr & USART_SR_PE) {
port->icount.parity++;
@@ -197,14 +158,138 @@ static void stm32_receive_chars(struct uart_port *port)
spin_lock(&port->lock);
}
+static void stm32_tx_dma_complete(void *arg)
+{
+ struct uart_port *port = arg;
+ struct stm32_port *stm32port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
+ unsigned int isr;
+ int ret;
+
+ ret = readl_relaxed_poll_timeout_atomic(port->membase + ofs->isr,
+ isr,
+ (isr & USART_SR_TC),
+ 10, 100000);
+
+ if (ret)
+ dev_err(port->dev, "terminal count not set\n");
+
+ if (ofs->icr == UNDEF_REG)
+ stm32_clr_bits(port, ofs->isr, USART_SR_TC);
+ else
+ stm32_set_bits(port, ofs->icr, USART_CR_TC);
+
+ stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
+ stm32port->tx_dma_busy = false;
+
+ /* Let's see if we have pending data to send */
+ stm32_transmit_chars(port);
+}
+
+static void stm32_transmit_chars_pio(struct uart_port *port)
+{
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+ struct circ_buf *xmit = &port->state->xmit;
+ unsigned int isr;
+ int ret;
+
+ if (stm32_port->tx_dma_busy) {
+ stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
+ stm32_port->tx_dma_busy = false;
+ }
+
+ ret = readl_relaxed_poll_timeout_atomic(port->membase + ofs->isr,
+ isr,
+ (isr & USART_SR_TXE),
+ 10, 100);
+
+ if (ret)
+ dev_err(port->dev, "tx empty not set\n");
+
+ stm32_set_bits(port, ofs->cr1, USART_CR1_TXEIE);
+
+ writel_relaxed(xmit->buf[xmit->tail], port->membase + ofs->tdr);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ port->icount.tx++;
+}
+
+static void stm32_transmit_chars_dma(struct uart_port *port)
+{
+ struct stm32_port *stm32port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
+ struct circ_buf *xmit = &port->state->xmit;
+ struct dma_async_tx_descriptor *desc = NULL;
+ dma_cookie_t cookie;
+ unsigned int count, i;
+
+ if (stm32port->tx_dma_busy)
+ return;
+
+ stm32port->tx_dma_busy = true;
+
+ 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);
+ }
+
+ desc = dmaengine_prep_slave_single(stm32port->tx_ch,
+ stm32port->tx_dma_buf,
+ count,
+ DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT);
+
+ if (!desc) {
+ for (i = count; i > 0; i--)
+ stm32_transmit_chars_pio(port);
+ return;
+ }
+
+ desc->callback = stm32_tx_dma_complete;
+ desc->callback_param = port;
+
+ /* Push current DMA TX transaction in the pending queue */
+ cookie = dmaengine_submit(desc);
+
+ /* Issue pending DMA TX requests */
+ dma_async_issue_pending(stm32port->tx_ch);
+
+ stm32_clr_bits(port, ofs->isr, USART_SR_TC);
+ stm32_set_bits(port, ofs->cr3, USART_CR3_DMAT);
+
+ xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
+ port->icount.tx += count;
+}
+
static void stm32_transmit_chars(struct uart_port *port)
{
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
struct circ_buf *xmit = &port->state->xmit;
if (port->x_char) {
- writel_relaxed(port->x_char, port->membase + USART_DR);
+ if (stm32_port->tx_dma_busy)
+ stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
+ writel_relaxed(port->x_char, port->membase + ofs->tdr);
port->x_char = 0;
port->icount.tx++;
+ if (stm32_port->tx_dma_busy)
+ stm32_set_bits(port, ofs->cr3, USART_CR3_DMAT);
return;
}
@@ -218,9 +303,10 @@ static void stm32_transmit_chars(struct uart_port *port)
return;
}
- writel_relaxed(xmit->buf[xmit->tail], port->membase + USART_DR);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
+ if (stm32_port->tx_ch)
+ stm32_transmit_chars_dma(port);
+ else
+ stm32_transmit_chars_pio(port);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
@@ -232,34 +318,60 @@ static void stm32_transmit_chars(struct uart_port *port)
static irqreturn_t stm32_interrupt(int irq, void *ptr)
{
struct uart_port *port = ptr;
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
u32 sr;
spin_lock(&port->lock);
- sr = readl_relaxed(port->membase + USART_SR);
+ sr = readl_relaxed(port->membase + ofs->isr);
- if (sr & USART_SR_RXNE)
- stm32_receive_chars(port);
+ if ((sr & USART_SR_RXNE) && !(stm32_port->rx_ch))
+ stm32_receive_chars(port, false);
- if (sr & USART_SR_TXE)
+ if ((sr & USART_SR_TXE) && !(stm32_port->tx_ch))
stm32_transmit_chars(port);
spin_unlock(&port->lock);
+ if (stm32_port->rx_ch)
+ return IRQ_WAKE_THREAD;
+ else
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t stm32_threaded_interrupt(int irq, void *ptr)
+{
+ struct uart_port *port = ptr;
+ struct stm32_port *stm32_port = to_stm32_port(port);
+
+ spin_lock(&port->lock);
+
+ if (stm32_port->rx_ch)
+ stm32_receive_chars(port, true);
+
+ spin_unlock(&port->lock);
+
return IRQ_HANDLED;
}
static unsigned int stm32_tx_empty(struct uart_port *port)
{
- return readl_relaxed(port->membase + USART_SR) & USART_SR_TXE;
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+
+ return readl_relaxed(port->membase + ofs->isr) & USART_SR_TXE;
}
static void stm32_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+
if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
- stm32_set_bits(port, USART_CR3, USART_CR3_RTSE);
+ stm32_set_bits(port, ofs->cr3, USART_CR3_RTSE);
else
- stm32_clr_bits(port, USART_CR3, USART_CR3_RTSE);
+ stm32_clr_bits(port, ofs->cr3, USART_CR3_RTSE);
}
static unsigned int stm32_get_mctrl(struct uart_port *port)
@@ -271,7 +383,10 @@ static unsigned int stm32_get_mctrl(struct uart_port *port)
/* Transmit stop */
static void stm32_stop_tx(struct uart_port *port)
{
- stm32_clr_bits(port, USART_CR1, USART_CR1_TXEIE);
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+
+ stm32_clr_bits(port, ofs->cr1, USART_CR1_TXEIE);
}
/* There are probably characters waiting to be transmitted. */
@@ -282,33 +397,40 @@ static void stm32_start_tx(struct uart_port *port)
if (uart_circ_empty(xmit))
return;
- stm32_set_bits(port, USART_CR1, USART_CR1_TXEIE | USART_CR1_TE);
+ stm32_transmit_chars(port);
}
/* Throttle the remote when input buffer is about to overflow. */
static void stm32_throttle(struct uart_port *port)
{
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
- stm32_clr_bits(port, USART_CR1, USART_CR1_RXNEIE);
+ stm32_clr_bits(port, ofs->cr1, USART_CR1_RXNEIE);
spin_unlock_irqrestore(&port->lock, flags);
}
/* Unthrottle the remote, the input buffer can now accept data. */
static void stm32_unthrottle(struct uart_port *port)
{
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
- stm32_set_bits(port, USART_CR1, USART_CR1_RXNEIE);
+ stm32_set_bits(port, ofs->cr1, USART_CR1_RXNEIE);
spin_unlock_irqrestore(&port->lock, flags);
}
/* Receive stop */
static void stm32_stop_rx(struct uart_port *port)
{
- stm32_clr_bits(port, USART_CR1, USART_CR1_RXNEIE);
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+
+ stm32_clr_bits(port, ofs->cr1, USART_CR1_RXNEIE);
}
/* Handle breaks - ignored by us */
@@ -318,26 +440,34 @@ static void stm32_break_ctl(struct uart_port *port, int break_state)
static int stm32_startup(struct uart_port *port)
{
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const char *name = to_platform_device(port->dev)->name;
u32 val;
int ret;
- ret = request_irq(port->irq, stm32_interrupt, 0, name, port);
+ ret = request_threaded_irq(port->irq, stm32_interrupt,
+ stm32_threaded_interrupt,
+ IRQF_NO_SUSPEND, name, port);
if (ret)
return ret;
val = USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
- stm32_set_bits(port, USART_CR1, val);
+ stm32_set_bits(port, ofs->cr1, val);
return 0;
}
static void stm32_shutdown(struct uart_port *port)
{
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+ struct stm32_usart_config *cfg = &stm32_port->info->cfg;
u32 val;
val = USART_CR1_TXEIE | USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
- stm32_set_bits(port, USART_CR1, val);
+ val |= BIT(cfg->uart_enable_bit);
+ stm32_clr_bits(port, ofs->cr1, val);
free_irq(port->irq, port);
}
@@ -346,6 +476,8 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+ struct stm32_usart_config *cfg = &stm32_port->info->cfg;
unsigned int baud;
u32 usartdiv, mantissa, fraction, oversampling;
tcflag_t cflag = termios->c_cflag;
@@ -360,9 +492,10 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
spin_lock_irqsave(&port->lock, flags);
/* Stop serial port and reset value */
- writel_relaxed(0, port->membase + USART_CR1);
+ writel_relaxed(0, port->membase + ofs->cr1);
- cr1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_UE | USART_CR1_RXNEIE;
+ cr1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE;
+ cr1 |= BIT(cfg->uart_enable_bit);
cr2 = 0;
cr3 = 0;
@@ -371,8 +504,12 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
if (cflag & PARENB) {
cr1 |= USART_CR1_PCE;
- if ((cflag & CSIZE) == CS8)
- cr1 |= USART_CR1_M;
+ if ((cflag & CSIZE) == CS8) {
+ if (cfg->has_7bits_data)
+ cr1 |= USART_CR1_M0;
+ else
+ cr1 |= USART_CR1_M;
+ }
}
if (cflag & PARODD)
@@ -394,15 +531,15 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
*/
if (usartdiv < 16) {
oversampling = 8;
- stm32_set_bits(port, USART_CR1, USART_CR1_OVER8);
+ stm32_set_bits(port, ofs->cr1, USART_CR1_OVER8);
} else {
oversampling = 16;
- stm32_clr_bits(port, USART_CR1, USART_CR1_OVER8);
+ stm32_clr_bits(port, ofs->cr1, USART_CR1_OVER8);
}
mantissa = (usartdiv / oversampling) << USART_BRR_DIV_M_SHIFT;
fraction = usartdiv % oversampling;
- writel_relaxed(mantissa | fraction, port->membase + USART_BRR);
+ writel_relaxed(mantissa | fraction, port->membase + ofs->brr);
uart_update_timeout(port, cflag, baud);
@@ -430,9 +567,12 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
if ((termios->c_cflag & CREAD) == 0)
port->ignore_status_mask |= USART_SR_DUMMY_RX;
- writel_relaxed(cr3, port->membase + USART_CR3);
- writel_relaxed(cr2, port->membase + USART_CR2);
- writel_relaxed(cr1, port->membase + USART_CR1);
+ if (stm32_port->rx_ch)
+ cr3 |= USART_CR3_DMAR;
+
+ writel_relaxed(cr3, port->membase + ofs->cr3);
+ writel_relaxed(cr2, port->membase + ofs->cr2);
+ writel_relaxed(cr1, port->membase + ofs->cr1);
spin_unlock_irqrestore(&port->lock, flags);
}
@@ -469,6 +609,8 @@ static void stm32_pm(struct uart_port *port, unsigned int state,
{
struct stm32_port *stm32port = container_of(port,
struct stm32_port, port);
+ struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
+ struct stm32_usart_config *cfg = &stm32port->info->cfg;
unsigned long flags = 0;
switch (state) {
@@ -477,7 +619,7 @@ static void stm32_pm(struct uart_port *port, unsigned int state,
break;
case UART_PM_STATE_OFF:
spin_lock_irqsave(&port->lock, flags);
- stm32_clr_bits(port, USART_CR1, USART_CR1_UE);
+ stm32_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
spin_unlock_irqrestore(&port->lock, flags);
clk_disable_unprepare(stm32port->clk);
break;
@@ -539,8 +681,6 @@ static int stm32_init_port(struct stm32_port *stm32port,
if (!stm32port->port.uartclk)
ret = -EINVAL;
- clk_disable_unprepare(stm32port->clk);
-
return ret;
}
@@ -560,30 +700,162 @@ static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev)
return NULL;
stm32_ports[id].hw_flow_control = of_property_read_bool(np,
- "auto-flow-control");
+ "st,hw-flow-ctrl");
stm32_ports[id].port.line = id;
return &stm32_ports[id];
}
#ifdef CONFIG_OF
static const struct of_device_id stm32_match[] = {
- { .compatible = "st,stm32-usart", },
- { .compatible = "st,stm32-uart", },
+ { .compatible = "st,stm32-usart", .data = &stm32f4_info},
+ { .compatible = "st,stm32-uart", .data = &stm32f4_info},
+ { .compatible = "st,stm32f7-usart", .data = &stm32f7_info},
+ { .compatible = "st,stm32f7-uart", .data = &stm32f7_info},
{},
};
MODULE_DEVICE_TABLE(of, stm32_match);
#endif
-static int stm32_serial_probe(struct platform_device *pdev)
+static int stm32_of_dma_rx_probe(struct stm32_port *stm32port,
+ struct platform_device *pdev)
{
+ struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
+ struct uart_port *port = &stm32port->port;
+ struct device *dev = &pdev->dev;
+ struct dma_slave_config config;
+ struct dma_async_tx_descriptor *desc = NULL;
+ dma_cookie_t cookie;
int ret;
+
+ /* Request DMA RX channel */
+ stm32port->rx_ch = dma_request_slave_channel(dev, "rx");
+ if (!stm32port->rx_ch) {
+ dev_info(dev, "rx dma alloc failed\n");
+ return -ENODEV;
+ }
+ stm32port->rx_buf = dma_alloc_coherent(&pdev->dev, RX_BUF_L,
+ &stm32port->rx_dma_buf,
+ GFP_KERNEL);
+ if (!stm32port->rx_buf) {
+ ret = -ENOMEM;
+ goto alloc_err;
+ }
+
+ /* Configure DMA channel */
+ memset(&config, 0, sizeof(config));
+ config.src_addr = port->mapbase + ofs->rdr;
+ config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+
+ ret = dmaengine_slave_config(stm32port->rx_ch, &config);
+ if (ret < 0) {
+ dev_err(dev, "rx dma channel config failed\n");
+ ret = -ENODEV;
+ goto config_err;
+ }
+
+ /* Prepare a DMA cyclic transaction */
+ desc = dmaengine_prep_dma_cyclic(stm32port->rx_ch,
+ stm32port->rx_dma_buf,
+ RX_BUF_L, RX_BUF_P, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT);
+ if (!desc) {
+ dev_err(dev, "rx dma prep cyclic failed\n");
+ ret = -ENODEV;
+ goto config_err;
+ }
+
+ /* No callback as dma buffer is drained on usart interrupt */
+ desc->callback = NULL;
+ desc->callback_param = NULL;
+
+ /* Push current DMA transaction in the pending queue */
+ cookie = dmaengine_submit(desc);
+
+ /* Issue pending DMA requests */
+ dma_async_issue_pending(stm32port->rx_ch);
+
+ return 0;
+
+config_err:
+ dma_free_coherent(&pdev->dev,
+ RX_BUF_L, stm32port->rx_buf,
+ stm32port->rx_dma_buf);
+
+alloc_err:
+ dma_release_channel(stm32port->rx_ch);
+ stm32port->rx_ch = NULL;
+
+ return ret;
+}
+
+static int stm32_of_dma_tx_probe(struct stm32_port *stm32port,
+ struct platform_device *pdev)
+{
+ struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
+ struct uart_port *port = &stm32port->port;
+ struct device *dev = &pdev->dev;
+ struct dma_slave_config config;
+ int ret;
+
+ stm32port->tx_dma_busy = false;
+
+ /* Request DMA TX channel */
+ stm32port->tx_ch = dma_request_slave_channel(dev, "tx");
+ if (!stm32port->tx_ch) {
+ dev_info(dev, "tx dma alloc failed\n");
+ return -ENODEV;
+ }
+ stm32port->tx_buf = dma_alloc_coherent(&pdev->dev, TX_BUF_L,
+ &stm32port->tx_dma_buf,
+ GFP_KERNEL);
+ if (!stm32port->tx_buf) {
+ ret = -ENOMEM;
+ goto alloc_err;
+ }
+
+ /* Configure DMA channel */
+ memset(&config, 0, sizeof(config));
+ config.dst_addr = port->mapbase + ofs->tdr;
+ config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+
+ ret = dmaengine_slave_config(stm32port->tx_ch, &config);
+ if (ret < 0) {
+ dev_err(dev, "tx dma channel config failed\n");
+ ret = -ENODEV;
+ goto config_err;
+ }
+
+ return 0;
+
+config_err:
+ dma_free_coherent(&pdev->dev,
+ TX_BUF_L, stm32port->tx_buf,
+ stm32port->tx_dma_buf);
+
+alloc_err:
+ dma_release_channel(stm32port->tx_ch);
+ stm32port->tx_ch = NULL;
+
+ return ret;
+}
+
+static int stm32_serial_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
struct stm32_port *stm32port;
+ int ret;
stm32port = stm32_of_get_stm32_port(pdev);
if (!stm32port)
return -ENODEV;
+ match = of_match_device(stm32_match, &pdev->dev);
+ if (match && match->data)
+ stm32port->info = (struct stm32_usart_info *)match->data;
+ else
+ return -EINVAL;
+
ret = stm32_init_port(stm32port, pdev);
if (ret)
return ret;
@@ -592,6 +864,14 @@ static int stm32_serial_probe(struct platform_device *pdev)
if (ret)
return ret;
+ ret = stm32_of_dma_rx_probe(stm32port, pdev);
+ if (ret)
+ dev_info(&pdev->dev, "interrupt mode used for rx (no dma)\n");
+
+ ret = stm32_of_dma_tx_probe(stm32port, pdev);
+ if (ret)
+ dev_info(&pdev->dev, "interrupt mode used for tx (no dma)\n");
+
platform_set_drvdata(pdev, &stm32port->port);
return 0;
@@ -600,6 +880,30 @@ static int stm32_serial_probe(struct platform_device *pdev)
static int stm32_serial_remove(struct platform_device *pdev)
{
struct uart_port *port = platform_get_drvdata(pdev);
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+
+ stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAR);
+
+ if (stm32_port->rx_ch)
+ dma_release_channel(stm32_port->rx_ch);
+
+ if (stm32_port->rx_dma_buf)
+ dma_free_coherent(&pdev->dev,
+ RX_BUF_L, stm32_port->rx_buf,
+ stm32_port->rx_dma_buf);
+
+ stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
+
+ if (stm32_port->tx_ch)
+ dma_release_channel(stm32_port->tx_ch);
+
+ if (stm32_port->tx_dma_buf)
+ dma_free_coherent(&pdev->dev,
+ TX_BUF_L, stm32_port->tx_buf,
+ stm32_port->tx_dma_buf);
+
+ clk_disable_unprepare(stm32_port->clk);
return uart_remove_one_port(&stm32_usart_driver, port);
}
@@ -608,15 +912,21 @@ static int stm32_serial_remove(struct platform_device *pdev)
#ifdef CONFIG_SERIAL_STM32_CONSOLE
static void stm32_console_putchar(struct uart_port *port, int ch)
{
- while (!(readl_relaxed(port->membase + USART_SR) & USART_SR_TXE))
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+
+ while (!(readl_relaxed(port->membase + ofs->isr) & USART_SR_TXE))
cpu_relax();
- writel_relaxed(ch, port->membase + USART_DR);
+ writel_relaxed(ch, port->membase + ofs->tdr);
}
static void stm32_console_write(struct console *co, const char *s, unsigned cnt)
{
struct uart_port *port = &stm32_ports[co->index].port;
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+ struct stm32_usart_config *cfg = &stm32_port->info->cfg;
unsigned long flags;
u32 old_cr1, new_cr1;
int locked = 1;
@@ -629,15 +939,16 @@ static void stm32_console_write(struct console *co, const char *s, unsigned cnt)
else
spin_lock(&port->lock);
- /* Save and disable interrupts */
- old_cr1 = readl_relaxed(port->membase + USART_CR1);
+ /* Save and disable interrupts, enable the transmitter */
+ old_cr1 = readl_relaxed(port->membase + ofs->cr1);
new_cr1 = old_cr1 & ~USART_CR1_IE_MASK;
- writel_relaxed(new_cr1, port->membase + USART_CR1);
+ new_cr1 |= USART_CR1_TE | BIT(cfg->uart_enable_bit);
+ writel_relaxed(new_cr1, port->membase + ofs->cr1);
uart_console_write(port, s, cnt, stm32_console_putchar);
/* Restore interrupt state */
- writel_relaxed(old_cr1, port->membase + USART_CR1);
+ writel_relaxed(old_cr1, port->membase + ofs->cr1);
if (locked)
spin_unlock(&port->lock);
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
new file mode 100644
index 000000000000..41d974923102
--- /dev/null
+++ b/drivers/tty/serial/stm32-usart.h
@@ -0,0 +1,229 @@
+/*
+ * Copyright (C) Maxime Coquelin 2015
+ * Authors: Maxime Coquelin <mcoquelin.stm32@gmail.com>
+ * Gerald Baeza <gerald_baeza@yahoo.fr>
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#define DRIVER_NAME "stm32-usart"
+
+struct stm32_usart_offsets {
+ u8 cr1;
+ u8 cr2;
+ u8 cr3;
+ u8 brr;
+ u8 gtpr;
+ u8 rtor;
+ u8 rqr;
+ u8 isr;
+ u8 icr;
+ u8 rdr;
+ u8 tdr;
+};
+
+struct stm32_usart_config {
+ u8 uart_enable_bit; /* USART_CR1_UE */
+ bool has_7bits_data;
+};
+
+struct stm32_usart_info {
+ struct stm32_usart_offsets ofs;
+ struct stm32_usart_config cfg;
+};
+
+#define UNDEF_REG ~0
+
+/* Register offsets */
+struct stm32_usart_info stm32f4_info = {
+ .ofs = {
+ .isr = 0x00,
+ .rdr = 0x04,
+ .tdr = 0x04,
+ .brr = 0x08,
+ .cr1 = 0x0c,
+ .cr2 = 0x10,
+ .cr3 = 0x14,
+ .gtpr = 0x18,
+ .rtor = UNDEF_REG,
+ .rqr = UNDEF_REG,
+ .icr = UNDEF_REG,
+ },
+ .cfg = {
+ .uart_enable_bit = 13,
+ .has_7bits_data = false,
+ }
+};
+
+struct stm32_usart_info stm32f7_info = {
+ .ofs = {
+ .cr1 = 0x00,
+ .cr2 = 0x04,
+ .cr3 = 0x08,
+ .brr = 0x0c,
+ .gtpr = 0x10,
+ .rtor = 0x14,
+ .rqr = 0x18,
+ .isr = 0x1c,
+ .icr = 0x20,
+ .rdr = 0x24,
+ .tdr = 0x28,
+ },
+ .cfg = {
+ .uart_enable_bit = 0,
+ .has_7bits_data = true,
+ }
+};
+
+/* USART_SR (F4) / USART_ISR (F7) */
+#define USART_SR_PE BIT(0)
+#define USART_SR_FE BIT(1)
+#define USART_SR_NF BIT(2)
+#define USART_SR_ORE BIT(3)
+#define USART_SR_IDLE BIT(4)
+#define USART_SR_RXNE BIT(5)
+#define USART_SR_TC BIT(6)
+#define USART_SR_TXE BIT(7)
+#define USART_SR_LBD BIT(8)
+#define USART_SR_CTSIF BIT(9)
+#define USART_SR_CTS BIT(10) /* F7 */
+#define USART_SR_RTOF BIT(11) /* F7 */
+#define USART_SR_EOBF BIT(12) /* F7 */
+#define USART_SR_ABRE BIT(14) /* F7 */
+#define USART_SR_ABRF BIT(15) /* F7 */
+#define USART_SR_BUSY BIT(16) /* F7 */
+#define USART_SR_CMF BIT(17) /* F7 */
+#define USART_SR_SBKF BIT(18) /* F7 */
+#define USART_SR_TEACK BIT(21) /* F7 */
+#define USART_SR_ERR_MASK (USART_SR_LBD | USART_SR_ORE | \
+ USART_SR_FE | USART_SR_PE)
+/* Dummy bits */
+#define USART_SR_DUMMY_RX BIT(16)
+
+/* USART_ICR (F7) */
+#define USART_CR_TC BIT(6)
+
+/* USART_DR */
+#define USART_DR_MASK GENMASK(8, 0)
+
+/* USART_BRR */
+#define USART_BRR_DIV_F_MASK GENMASK(3, 0)
+#define USART_BRR_DIV_M_MASK GENMASK(15, 4)
+#define USART_BRR_DIV_M_SHIFT 4
+
+/* USART_CR1 */
+#define USART_CR1_SBK BIT(0)
+#define USART_CR1_RWU BIT(1) /* F4 */
+#define USART_CR1_RE BIT(2)
+#define USART_CR1_TE BIT(3)
+#define USART_CR1_IDLEIE BIT(4)
+#define USART_CR1_RXNEIE BIT(5)
+#define USART_CR1_TCIE BIT(6)
+#define USART_CR1_TXEIE BIT(7)
+#define USART_CR1_PEIE BIT(8)
+#define USART_CR1_PS BIT(9)
+#define USART_CR1_PCE BIT(10)
+#define USART_CR1_WAKE BIT(11)
+#define USART_CR1_M BIT(12)
+#define USART_CR1_M0 BIT(12) /* F7 */
+#define USART_CR1_MME BIT(13) /* F7 */
+#define USART_CR1_CMIE BIT(14) /* F7 */
+#define USART_CR1_OVER8 BIT(15)
+#define USART_CR1_DEDT_MASK GENMASK(20, 16) /* F7 */
+#define USART_CR1_DEAT_MASK GENMASK(25, 21) /* F7 */
+#define USART_CR1_RTOIE BIT(26) /* F7 */
+#define USART_CR1_EOBIE BIT(27) /* F7 */
+#define USART_CR1_M1 BIT(28) /* F7 */
+#define USART_CR1_IE_MASK (GENMASK(8, 4) | BIT(14) | BIT(26) | BIT(27))
+
+/* USART_CR2 */
+#define USART_CR2_ADD_MASK GENMASK(3, 0) /* F4 */
+#define USART_CR2_ADDM7 BIT(4) /* F7 */
+#define USART_CR2_LBDL BIT(5)
+#define USART_CR2_LBDIE BIT(6)
+#define USART_CR2_LBCL BIT(8)
+#define USART_CR2_CPHA BIT(9)
+#define USART_CR2_CPOL BIT(10)
+#define USART_CR2_CLKEN BIT(11)
+#define USART_CR2_STOP_2B BIT(13)
+#define USART_CR2_STOP_MASK GENMASK(13, 12)
+#define USART_CR2_LINEN BIT(14)
+#define USART_CR2_SWAP BIT(15) /* F7 */
+#define USART_CR2_RXINV BIT(16) /* F7 */
+#define USART_CR2_TXINV BIT(17) /* F7 */
+#define USART_CR2_DATAINV BIT(18) /* F7 */
+#define USART_CR2_MSBFIRST BIT(19) /* F7 */
+#define USART_CR2_ABREN BIT(20) /* F7 */
+#define USART_CR2_ABRMOD_MASK GENMASK(22, 21) /* F7 */
+#define USART_CR2_RTOEN BIT(23) /* F7 */
+#define USART_CR2_ADD_F7_MASK GENMASK(31, 24) /* F7 */
+
+/* USART_CR3 */
+#define USART_CR3_EIE BIT(0)
+#define USART_CR3_IREN BIT(1)
+#define USART_CR3_IRLP BIT(2)
+#define USART_CR3_HDSEL BIT(3)
+#define USART_CR3_NACK BIT(4)
+#define USART_CR3_SCEN BIT(5)
+#define USART_CR3_DMAR BIT(6)
+#define USART_CR3_DMAT BIT(7)
+#define USART_CR3_RTSE BIT(8)
+#define USART_CR3_CTSE BIT(9)
+#define USART_CR3_CTSIE BIT(10)
+#define USART_CR3_ONEBIT BIT(11)
+#define USART_CR3_OVRDIS BIT(12) /* F7 */
+#define USART_CR3_DDRE BIT(13) /* F7 */
+#define USART_CR3_DEM BIT(14) /* F7 */
+#define USART_CR3_DEP BIT(15) /* F7 */
+#define USART_CR3_SCARCNT_MASK GENMASK(19, 17) /* F7 */
+
+/* USART_GTPR */
+#define USART_GTPR_PSC_MASK GENMASK(7, 0)
+#define USART_GTPR_GT_MASK GENMASK(15, 8)
+
+/* USART_RTOR */
+#define USART_RTOR_RTO_MASK GENMASK(23, 0) /* F7 */
+#define USART_RTOR_BLEN_MASK GENMASK(31, 24) /* F7 */
+
+/* USART_RQR */
+#define USART_RQR_ABRRQ BIT(0) /* F7 */
+#define USART_RQR_SBKRQ BIT(1) /* F7 */
+#define USART_RQR_MMRQ BIT(2) /* F7 */
+#define USART_RQR_RXFRQ BIT(3) /* F7 */
+#define USART_RQR_TXFRQ BIT(4) /* F7 */
+
+/* USART_ICR */
+#define USART_ICR_PECF BIT(0) /* F7 */
+#define USART_ICR_FFECF BIT(1) /* F7 */
+#define USART_ICR_NCF BIT(2) /* F7 */
+#define USART_ICR_ORECF BIT(3) /* F7 */
+#define USART_ICR_IDLECF BIT(4) /* F7 */
+#define USART_ICR_TCCF BIT(6) /* F7 */
+#define USART_ICR_LBDCF BIT(8) /* F7 */
+#define USART_ICR_CTSCF BIT(9) /* F7 */
+#define USART_ICR_RTOCF BIT(11) /* F7 */
+#define USART_ICR_EOBCF BIT(12) /* F7 */
+#define USART_ICR_CMCF BIT(17) /* F7 */
+
+#define STM32_SERIAL_NAME "ttyS"
+#define STM32_MAX_PORTS 6
+
+#define RX_BUF_L 200 /* dma rx buffer length */
+#define RX_BUF_P RX_BUF_L /* dma rx buffer period */
+#define TX_BUF_L 200 /* dma tx buffer length */
+
+struct stm32_port {
+ struct uart_port port;
+ struct clk *clk;
+ struct stm32_usart_info *info;
+ struct dma_chan *rx_ch; /* dma rx channel */
+ dma_addr_t rx_dma_buf; /* dma rx buffer bus address */
+ unsigned char *rx_buf; /* dma rx buffer cpu address */
+ struct dma_chan *tx_ch; /* dma tx channel */
+ dma_addr_t tx_dma_buf; /* dma tx buffer bus address */
+ unsigned char *tx_buf; /* dma tx buffer cpu address */
+ bool tx_dma_busy; /* dma tx busy */
+ bool hw_flow_control;
+};
+
+static struct stm32_port stm32_ports[STM32_MAX_PORTS];
+static struct uart_driver stm32_usart_driver;
diff --git a/drivers/tty/serial/timbuart.c b/drivers/tty/serial/timbuart.c
index 512c162634a3..5da7fe40e391 100644
--- a/drivers/tty/serial/timbuart.c
+++ b/drivers/tty/serial/timbuart.c
@@ -394,7 +394,7 @@ static int timbuart_verify_port(struct uart_port *port,
return -EINVAL;
}
-static struct uart_ops timbuart_ops = {
+static const struct uart_ops timbuart_ops = {
.tx_empty = timbuart_tx_empty,
.set_mctrl = timbuart_set_mctrl,
.get_mctrl = timbuart_get_mctrl,
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index 05089b6c2f30..817bb0d3f326 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -387,7 +387,7 @@ static void ulite_put_poll_char(struct uart_port *port, unsigned char ch)
}
#endif
-static struct uart_ops ulite_ops = {
+static const struct uart_ops ulite_ops = {
.tx_empty = ulite_tx_empty,
.set_mctrl = ulite_set_mctrl,
.get_mctrl = ulite_get_mctrl,
diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c
index 23cfc5e16b45..6b85adce0ac9 100644
--- a/drivers/tty/serial/vt8500_serial.c
+++ b/drivers/tty/serial/vt8500_serial.c
@@ -118,7 +118,7 @@ struct vt8500_port {
* have been allocated as we can't use pdev->id in
* devicetree
*/
-static unsigned long vt8500_ports_in_use;
+static DECLARE_BITMAP(vt8500_ports_in_use, VT8500_MAX_PORTS);
static inline void vt8500_write(struct uart_port *port, unsigned int val,
unsigned int off)
@@ -663,15 +663,15 @@ static int vt8500_serial_probe(struct platform_device *pdev)
if (port < 0) {
/* calculate the port id */
- port = find_first_zero_bit(&vt8500_ports_in_use,
- sizeof(vt8500_ports_in_use));
+ port = find_first_zero_bit(vt8500_ports_in_use,
+ VT8500_MAX_PORTS);
}
if (port >= VT8500_MAX_PORTS)
return -ENODEV;
/* reserve the port id */
- if (test_and_set_bit(port, &vt8500_ports_in_use)) {
+ if (test_and_set_bit(port, vt8500_ports_in_use)) {
/* port already in use - shouldn't really happen */
return -EBUSY;
}
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 9ca1a4d1b66a..f37edaa5ac75 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -57,7 +57,7 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
#define CDNS_UART_IMR 0x10 /* Interrupt Mask */
#define CDNS_UART_ISR 0x14 /* Interrupt Status */
#define CDNS_UART_BAUDGEN 0x18 /* Baud Rate Generator */
-#define CDNS_UART_RXTOUT 0x1C /* RX Timeout */
+#define CDNS_UART_RXTOUT 0x1C /* RX Timeout */
#define CDNS_UART_RXWM 0x20 /* RX FIFO Trigger Level */
#define CDNS_UART_MODEMCR 0x24 /* Modem Control */
#define CDNS_UART_MODEMSR 0x28 /* Modem Status */
@@ -68,6 +68,7 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
#define CDNS_UART_IRRX_PWIDTH 0x3C /* IR Min Received Pulse Width */
#define CDNS_UART_IRTX_PWIDTH 0x40 /* IR Transmitted pulse Width */
#define CDNS_UART_TXWM 0x44 /* TX FIFO Trigger Level */
+#define CDNS_UART_RXBS 0x48 /* RX FIFO byte status register */
/* Control Register Bit Definitions */
#define CDNS_UART_CR_STOPBRK 0x00000100 /* Stop TX break */
@@ -79,6 +80,9 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
#define CDNS_UART_CR_TXRST 0x00000002 /* TX logic reset */
#define CDNS_UART_CR_RXRST 0x00000001 /* RX logic reset */
#define CDNS_UART_CR_RST_TO 0x00000040 /* Restart Timeout Counter */
+#define CDNS_UART_RXBS_PARITY 0x00000001 /* Parity error status */
+#define CDNS_UART_RXBS_FRAMING 0x00000002 /* Framing error status */
+#define CDNS_UART_RXBS_BRK 0x00000004 /* Overrun error status */
/*
* Mode Register:
@@ -126,13 +130,27 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
#define CDNS_UART_IXR_RXEMPTY 0x00000002 /* RX FIFO empty interrupt. */
#define CDNS_UART_IXR_MASK 0x00001FFF /* Valid bit mask */
-#define CDNS_UART_RX_IRQS (CDNS_UART_IXR_PARITY | CDNS_UART_IXR_FRAMING | \
- CDNS_UART_IXR_OVERRUN | CDNS_UART_IXR_RXTRIG | \
+ /*
+ * Do not enable parity error interrupt for the following
+ * reason: When parity error interrupt is enabled, each Rx
+ * parity error always results in 2 events. The first one
+ * being parity error interrupt and the second one with a
+ * proper Rx interrupt with the incoming data. Disabling
+ * parity error interrupt ensures better handling of parity
+ * error events. With this change, for a parity error case, we
+ * get a Rx interrupt with parity error set in ISR register
+ * and we still handle parity errors in the desired way.
+ */
+
+#define CDNS_UART_RX_IRQS (CDNS_UART_IXR_FRAMING | \
+ CDNS_UART_IXR_OVERRUN | \
+ CDNS_UART_IXR_RXTRIG | \
CDNS_UART_IXR_TOUT)
/* Goes in read_status_mask for break detection as the HW doesn't do it*/
-#define CDNS_UART_IXR_BRK 0x80000000
+#define CDNS_UART_IXR_BRK 0x00002000
+#define CDNS_UART_RXBS_SUPPORT BIT(1)
/*
* Modem Control register:
* The read/write Modem Control register controls the interface with the modem
@@ -172,46 +190,66 @@ struct cdns_uart {
struct clk *pclk;
unsigned int baud;
struct notifier_block clk_rate_change_nb;
+ u32 quirks;
+};
+struct cdns_platform_data {
+ u32 quirks;
};
#define to_cdns_uart(_nb) container_of(_nb, struct cdns_uart, \
clk_rate_change_nb);
-static void cdns_uart_handle_rx(struct uart_port *port, unsigned int isrstatus)
+/**
+ * cdns_uart_handle_rx - Handle the received bytes along with Rx errors.
+ * @dev_id: Id of the UART port
+ * @isrstatus: The interrupt status register value as read
+ * Return: None
+ */
+static void cdns_uart_handle_rx(void *dev_id, unsigned int isrstatus)
{
- /*
- * There is no hardware break detection, so we interpret framing
- * error with all-zeros data as a break sequence. Most of the time,
- * there's another non-zero byte at the end of the sequence.
- */
- if (isrstatus & CDNS_UART_IXR_FRAMING) {
- while (!(readl(port->membase + CDNS_UART_SR) &
- CDNS_UART_SR_RXEMPTY)) {
- if (!readl(port->membase + CDNS_UART_FIFO)) {
+ struct uart_port *port = (struct uart_port *)dev_id;
+ struct cdns_uart *cdns_uart = port->private_data;
+ unsigned int data;
+ unsigned int rxbs_status = 0;
+ unsigned int status_mask;
+ unsigned int framerrprocessed = 0;
+ char status = TTY_NORMAL;
+ bool is_rxbs_support;
+
+ is_rxbs_support = cdns_uart->quirks & CDNS_UART_RXBS_SUPPORT;
+
+ while ((readl(port->membase + CDNS_UART_SR) &
+ CDNS_UART_SR_RXEMPTY) != CDNS_UART_SR_RXEMPTY) {
+ if (is_rxbs_support)
+ rxbs_status = readl(port->membase + CDNS_UART_RXBS);
+ data = readl(port->membase + CDNS_UART_FIFO);
+ port->icount.rx++;
+ /*
+ * There is no hardware break detection in Zynq, so we interpret
+ * framing error with all-zeros data as a break sequence.
+ * Most of the time, there's another non-zero byte at the
+ * end of the sequence.
+ */
+ if (!is_rxbs_support && (isrstatus & CDNS_UART_IXR_FRAMING)) {
+ if (!data) {
port->read_status_mask |= CDNS_UART_IXR_BRK;
- isrstatus &= ~CDNS_UART_IXR_FRAMING;
+ framerrprocessed = 1;
+ continue;
}
}
- writel(CDNS_UART_IXR_FRAMING, port->membase + CDNS_UART_ISR);
- }
-
- /* drop byte with parity error if IGNPAR specified */
- if (isrstatus & port->ignore_status_mask & CDNS_UART_IXR_PARITY)
- isrstatus &= ~(CDNS_UART_IXR_RXTRIG | CDNS_UART_IXR_TOUT);
-
- isrstatus &= port->read_status_mask;
- isrstatus &= ~port->ignore_status_mask;
-
- if (!(isrstatus & (CDNS_UART_IXR_TOUT | CDNS_UART_IXR_RXTRIG)))
- return;
-
- while (!(readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_RXEMPTY)) {
- u32 data;
- char status = TTY_NORMAL;
+ if (is_rxbs_support && (rxbs_status & CDNS_UART_RXBS_BRK)) {
+ port->icount.brk++;
+ status = TTY_BREAK;
+ if (uart_handle_break(port))
+ continue;
+ }
- data = readl(port->membase + CDNS_UART_FIFO);
+ isrstatus &= port->read_status_mask;
+ isrstatus &= ~port->ignore_status_mask;
+ status_mask = port->read_status_mask;
+ status_mask &= ~port->ignore_status_mask;
- /* Non-NULL byte after BREAK is garbage (99%) */
- if (data && (port->read_status_mask & CDNS_UART_IXR_BRK)) {
+ if (data &&
+ (port->read_status_mask & CDNS_UART_IXR_BRK)) {
port->read_status_mask &= ~CDNS_UART_IXR_BRK;
port->icount.brk++;
if (uart_handle_break(port))
@@ -221,57 +259,83 @@ static void cdns_uart_handle_rx(struct uart_port *port, unsigned int isrstatus)
if (uart_handle_sysrq_char(port, data))
continue;
- port->icount.rx++;
-
- if (isrstatus & CDNS_UART_IXR_PARITY) {
- port->icount.parity++;
- status = TTY_PARITY;
- } else if (isrstatus & CDNS_UART_IXR_FRAMING) {
- port->icount.frame++;
- status = TTY_FRAME;
- } else if (isrstatus & CDNS_UART_IXR_OVERRUN) {
+ if (is_rxbs_support) {
+ if ((rxbs_status & CDNS_UART_RXBS_PARITY)
+ && (status_mask & CDNS_UART_IXR_PARITY)) {
+ port->icount.parity++;
+ status = TTY_PARITY;
+ }
+ if ((rxbs_status & CDNS_UART_RXBS_FRAMING)
+ && (status_mask & CDNS_UART_IXR_PARITY)) {
+ port->icount.frame++;
+ status = TTY_FRAME;
+ }
+ } else {
+ if (isrstatus & CDNS_UART_IXR_PARITY) {
+ port->icount.parity++;
+ status = TTY_PARITY;
+ }
+ if ((isrstatus & CDNS_UART_IXR_FRAMING) &&
+ !framerrprocessed) {
+ port->icount.frame++;
+ status = TTY_FRAME;
+ }
+ }
+ if (isrstatus & CDNS_UART_IXR_OVERRUN) {
port->icount.overrun++;
+ tty_insert_flip_char(&port->state->port, 0,
+ TTY_OVERRUN);
}
-
- uart_insert_char(port, isrstatus, CDNS_UART_IXR_OVERRUN,
- data, status);
+ tty_insert_flip_char(&port->state->port, data, status);
+ isrstatus = 0;
}
+ spin_unlock(&port->lock);
tty_flip_buffer_push(&port->state->port);
+ spin_lock(&port->lock);
}
-static void cdns_uart_handle_tx(struct uart_port *port)
+/**
+ * cdns_uart_handle_tx - Handle the bytes to be Txed.
+ * @dev_id: Id of the UART port
+ * Return: None
+ */
+static void cdns_uart_handle_tx(void *dev_id)
{
+ struct uart_port *port = (struct uart_port *)dev_id;
unsigned int numbytes;
if (uart_circ_empty(&port->state->xmit)) {
writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IDR);
- return;
- }
-
- numbytes = port->fifosize;
- while (numbytes && !uart_circ_empty(&port->state->xmit) &&
- !(readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL)) {
- /*
- * Get the data from the UART circular buffer
- * and write it to the cdns_uart's TX_FIFO
- * register.
- */
- writel(port->state->xmit.buf[port->state->xmit.tail],
- port->membase + CDNS_UART_FIFO);
- port->icount.tx++;
-
- /*
- * Adjust the tail of the UART buffer and wrap
- * the buffer if it reaches limit.
- */
- port->state->xmit.tail =
- (port->state->xmit.tail + 1) & (UART_XMIT_SIZE - 1);
+ } else {
+ numbytes = port->fifosize;
+ while (numbytes && !uart_circ_empty(&port->state->xmit) &&
+ !(readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL)) {
+ /*
+ * Get the data from the UART circular buffer
+ * and write it to the cdns_uart's TX_FIFO
+ * register.
+ */
+ writel(
+ port->state->xmit.buf[port->state->xmit.
+ tail], port->membase + CDNS_UART_FIFO);
+
+ port->icount.tx++;
+
+ /*
+ * Adjust the tail of the UART buffer and wrap
+ * the buffer if it reaches limit.
+ */
+ port->state->xmit.tail =
+ (port->state->xmit.tail + 1) &
+ (UART_XMIT_SIZE - 1);
+
+ numbytes--;
+ }
- numbytes--;
+ if (uart_circ_chars_pending(
+ &port->state->xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(port);
}
-
- if (uart_circ_chars_pending(&port->state->xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
}
/**
@@ -284,27 +348,24 @@ static void cdns_uart_handle_tx(struct uart_port *port)
static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
{
struct uart_port *port = (struct uart_port *)dev_id;
- unsigned long flags;
unsigned int isrstatus;
- spin_lock_irqsave(&port->lock, flags);
+ spin_lock(&port->lock);
/* Read the interrupt status register to determine which
- * interrupt(s) is/are active.
+ * interrupt(s) is/are active and clear them.
*/
isrstatus = readl(port->membase + CDNS_UART_ISR);
-
- if (isrstatus & CDNS_UART_RX_IRQS)
- cdns_uart_handle_rx(port, isrstatus);
-
- if ((isrstatus & CDNS_UART_IXR_TXEMPTY) == CDNS_UART_IXR_TXEMPTY)
- cdns_uart_handle_tx(port);
-
writel(isrstatus, port->membase + CDNS_UART_ISR);
- /* be sure to release the lock and tty before leaving */
- spin_unlock_irqrestore(&port->lock, flags);
+ if (isrstatus & CDNS_UART_IXR_TXEMPTY) {
+ cdns_uart_handle_tx(dev_id);
+ isrstatus &= ~CDNS_UART_IXR_TXEMPTY;
+ }
+ if (isrstatus & CDNS_UART_IXR_MASK)
+ cdns_uart_handle_rx(dev_id, isrstatus);
+ spin_unlock(&port->lock);
return IRQ_HANDLED;
}
@@ -653,6 +714,10 @@ static void cdns_uart_set_termios(struct uart_port *port,
ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
writel(ctrl_reg, port->membase + CDNS_UART_CR);
+ while (readl(port->membase + CDNS_UART_CR) &
+ (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
+ cpu_relax();
+
/*
* Clear the RX disable and TX disable bits and then set the TX enable
* bit and RX enable bit to enable the transmitter and receiver.
@@ -736,10 +801,14 @@ static void cdns_uart_set_termios(struct uart_port *port,
*/
static int cdns_uart_startup(struct uart_port *port)
{
+ struct cdns_uart *cdns_uart = port->private_data;
+ bool is_brk_support;
int ret;
unsigned long flags;
unsigned int status = 0;
+ is_brk_support = cdns_uart->quirks & CDNS_UART_RXBS_SUPPORT;
+
spin_lock_irqsave(&port->lock, flags);
/* Disable the TX and RX */
@@ -752,6 +821,10 @@ static int cdns_uart_startup(struct uart_port *port)
writel(CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST,
port->membase + CDNS_UART_CR);
+ while (readl(port->membase + CDNS_UART_CR) &
+ (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
+ cpu_relax();
+
/*
* Clear the RX disable bit and then set the RX enable bit to enable
* the receiver.
@@ -794,7 +867,11 @@ static int cdns_uart_startup(struct uart_port *port)
}
/* Set the Interrupt Registers with desired interrupts */
- writel(CDNS_UART_RX_IRQS, port->membase + CDNS_UART_IER);
+ if (is_brk_support)
+ writel(CDNS_UART_RX_IRQS | CDNS_UART_IXR_BRK,
+ port->membase + CDNS_UART_IER);
+ else
+ writel(CDNS_UART_RX_IRQS, port->membase + CDNS_UART_IER);
return 0;
}
@@ -993,7 +1070,7 @@ static void cdns_uart_pm(struct uart_port *port, unsigned int state,
}
}
-static struct uart_ops cdns_uart_ops = {
+static const struct uart_ops cdns_uart_ops = {
.set_mctrl = cdns_uart_set_mctrl,
.get_mctrl = cdns_uart_get_mctrl,
.start_tx = cdns_uart_start_tx,
@@ -1088,9 +1165,34 @@ static void __init cdns_early_write(struct console *con, const char *s,
static int __init cdns_early_console_setup(struct earlycon_device *device,
const char *opt)
{
- if (!device->port.membase)
+ struct uart_port *port = &device->port;
+
+ if (!port->membase)
return -ENODEV;
+ /* initialise control register */
+ writel(CDNS_UART_CR_TX_EN|CDNS_UART_CR_TXRST|CDNS_UART_CR_RXRST,
+ port->membase + CDNS_UART_CR);
+
+ /* only set baud if specified on command line - otherwise
+ * assume it has been initialized by a boot loader.
+ */
+ if (device->baud) {
+ u32 cd = 0, bdiv = 0;
+ u32 mr;
+ int div8;
+
+ cdns_uart_calc_baud_divs(port->uartclk, device->baud,
+ &bdiv, &cd, &div8);
+ mr = CDNS_UART_MR_PARITY_NONE;
+ if (div8)
+ mr |= CDNS_UART_MR_CLKSEL;
+
+ writel(mr, port->membase + CDNS_UART_MR);
+ writel(cd, port->membase + CDNS_UART_BAUDGEN);
+ writel(bdiv, port->membase + CDNS_UART_BAUDDIV);
+ }
+
device->con->write = cdns_early_write;
return 0;
@@ -1328,6 +1430,18 @@ static int cdns_uart_resume(struct device *device)
static SIMPLE_DEV_PM_OPS(cdns_uart_dev_pm_ops, cdns_uart_suspend,
cdns_uart_resume);
+static const struct cdns_platform_data zynqmp_uart_def = {
+ .quirks = CDNS_UART_RXBS_SUPPORT, };
+
+/* Match table for of_platform binding */
+static const struct of_device_id cdns_uart_of_match[] = {
+ { .compatible = "xlnx,xuartps", },
+ { .compatible = "cdns,uart-r1p8", },
+ { .compatible = "cdns,uart-r1p12", .data = &zynqmp_uart_def },
+ {}
+};
+MODULE_DEVICE_TABLE(of, cdns_uart_of_match);
+
/**
* cdns_uart_probe - Platform driver probe
* @pdev: Pointer to the platform device structure
@@ -1340,12 +1454,20 @@ static int cdns_uart_probe(struct platform_device *pdev)
struct uart_port *port;
struct resource *res;
struct cdns_uart *cdns_uart_data;
+ const struct of_device_id *match;
cdns_uart_data = devm_kzalloc(&pdev->dev, sizeof(*cdns_uart_data),
GFP_KERNEL);
if (!cdns_uart_data)
return -ENOMEM;
+ match = of_match_node(cdns_uart_of_match, pdev->dev.of_node);
+ if (match && match->data) {
+ const struct cdns_platform_data *data = match->data;
+
+ cdns_uart_data->quirks = data->quirks;
+ }
+
cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(cdns_uart_data->pclk)) {
cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "aper_clk");
@@ -1471,14 +1593,6 @@ static int cdns_uart_remove(struct platform_device *pdev)
return rc;
}
-/* Match table for of_platform binding */
-static const struct of_device_id cdns_uart_of_match[] = {
- { .compatible = "xlnx,xuartps", },
- { .compatible = "cdns,uart-r1p8", },
- {}
-};
-MODULE_DEVICE_TABLE(of, cdns_uart_of_match);
-
static struct platform_driver cdns_uart_platform_driver = {
.probe = cdns_uart_probe,
.remove = cdns_uart_remove,