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/*
* (C) Copyright 2017 Whitebox Systems / Northend Systems B.V.
* S.J.R. van Schaik <stephan@whiteboxsystems.nl>
* M.B.W. Wajer <merlijn@whiteboxsystems.nl>
*
* (C) Copyright 2017 Olimex Ltd..
* Stefan Mavrodiev <stefan@olimex.com>
*
* Based on linux spi driver. Original copyright follows:
* linux/drivers/spi/spi-sun4i.c
*
* Copyright (C) 2012 - 2014 Allwinner Tech
* Pan Nan <pannan@allwinnertech.com>
*
* Copyright (C) 2014 Maxime Ripard
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <log.h>
#include <spi.h>
#include <errno.h>
#include <fdt_support.h>
#include <reset.h>
#include <wait_bit.h>
#include <asm/global_data.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <asm/bitops.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <linux/iopoll.h>
DECLARE_GLOBAL_DATA_PTR;
/* sun4i spi registers */
#define SUN4I_RXDATA_REG 0x00
#define SUN4I_TXDATA_REG 0x04
#define SUN4I_CTL_REG 0x08
#define SUN4I_CLK_CTL_REG 0x1c
#define SUN4I_BURST_CNT_REG 0x20
#define SUN4I_XMIT_CNT_REG 0x24
#define SUN4I_FIFO_STA_REG 0x28
/* sun6i spi registers */
#define SUN6I_GBL_CTL_REG 0x04
#define SUN6I_TFR_CTL_REG 0x08
#define SUN6I_FIFO_CTL_REG 0x18
#define SUN6I_FIFO_STA_REG 0x1c
#define SUN6I_CLK_CTL_REG 0x24
#define SUN6I_BURST_CNT_REG 0x30
#define SUN6I_XMIT_CNT_REG 0x34
#define SUN6I_BURST_CTL_REG 0x38
#define SUN6I_TXDATA_REG 0x200
#define SUN6I_RXDATA_REG 0x300
/* sun spi bits */
#define SUN4I_CTL_ENABLE BIT(0)
#define SUN4I_CTL_MASTER BIT(1)
#define SUN4I_CLK_CTL_CDR2_MASK 0xff
#define SUN4I_CLK_CTL_CDR2(div) ((div) & SUN4I_CLK_CTL_CDR2_MASK)
#define SUN4I_CLK_CTL_CDR1_MASK 0xf
#define SUN4I_CLK_CTL_CDR1(div) (((div) & SUN4I_CLK_CTL_CDR1_MASK) << 8)
#define SUN4I_CLK_CTL_DRS BIT(12)
#define SUN4I_MAX_XFER_SIZE 0xffffff
#define SUN4I_BURST_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE)
#define SUN4I_XMIT_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE)
#define SUN4I_FIFO_STA_RF_CNT_BITS 0
#define SUN4I_SPI_MAX_RATE 24000000
#define SUN4I_SPI_MIN_RATE 3000
#define SUN4I_SPI_DEFAULT_RATE 1000000
#define SUN4I_SPI_TIMEOUT_US 1000000
#define SPI_REG(priv, reg) ((priv)->base + \
(priv)->variant->regs[reg])
#define SPI_BIT(priv, bit) ((priv)->variant->bits[bit])
#define SPI_CS(priv, cs) (((cs) << SPI_BIT(priv, SPI_TCR_CS_SEL)) & \
SPI_BIT(priv, SPI_TCR_CS_MASK))
/* sun spi register set */
enum sun4i_spi_regs {
SPI_GCR,
SPI_TCR,
SPI_FCR,
SPI_FSR,
SPI_CCR,
SPI_BC,
SPI_TC,
SPI_BCTL,
SPI_TXD,
SPI_RXD,
};
/* sun spi register bits */
enum sun4i_spi_bits {
SPI_GCR_TP,
SPI_GCR_SRST,
SPI_TCR_CPHA,
SPI_TCR_CPOL,
SPI_TCR_CS_ACTIVE_LOW,
SPI_TCR_CS_SEL,
SPI_TCR_CS_MASK,
SPI_TCR_XCH,
SPI_TCR_CS_MANUAL,
SPI_TCR_CS_LEVEL,
SPI_FCR_TF_RST,
SPI_FCR_RF_RST,
SPI_FSR_RF_CNT_MASK,
};
struct sun4i_spi_variant {
const unsigned long *regs;
const u32 *bits;
u32 fifo_depth;
bool has_soft_reset;
bool has_burst_ctl;
};
struct sun4i_spi_plat {
struct sun4i_spi_variant *variant;
u32 base;
u32 max_hz;
};
struct sun4i_spi_priv {
struct sun4i_spi_variant *variant;
struct clk clk_ahb, clk_mod;
struct reset_ctl reset;
u32 base;
u32 freq;
u32 mode;
const u8 *tx_buf;
u8 *rx_buf;
};
static inline void sun4i_spi_drain_fifo(struct sun4i_spi_priv *priv, int len)
{
u8 byte;
while (len--) {
byte = readb(SPI_REG(priv, SPI_RXD));
if (priv->rx_buf)
*priv->rx_buf++ = byte;
}
}
static inline void sun4i_spi_fill_fifo(struct sun4i_spi_priv *priv, int len)
{
u8 byte;
while (len--) {
byte = priv->tx_buf ? *priv->tx_buf++ : 0;
writeb(byte, SPI_REG(priv, SPI_TXD));
}
}
static void sun4i_spi_set_cs(struct udevice *bus, u8 cs, bool enable)
{
struct sun4i_spi_priv *priv = dev_get_priv(bus);
u32 reg;
reg = readl(SPI_REG(priv, SPI_TCR));
reg &= ~SPI_BIT(priv, SPI_TCR_CS_MASK);
reg |= SPI_CS(priv, cs);
if (enable)
reg &= ~SPI_BIT(priv, SPI_TCR_CS_LEVEL);
else
reg |= SPI_BIT(priv, SPI_TCR_CS_LEVEL);
writel(reg, SPI_REG(priv, SPI_TCR));
}
static int sun4i_spi_parse_pins(struct udevice *dev)
{
const void *fdt = gd->fdt_blob;
const char *pin_name;
const fdt32_t *list;
u32 phandle;
int drive, pull = 0, pin, i;
int offset;
int size;
list = fdt_getprop(fdt, dev_of_offset(dev), "pinctrl-0", &size);
if (!list) {
printf("WARNING: sun4i_spi: cannot find pinctrl-0 node\n");
return -EINVAL;
}
while (size) {
phandle = fdt32_to_cpu(*list++);
size -= sizeof(*list);
offset = fdt_node_offset_by_phandle(fdt, phandle);
if (offset < 0)
return offset;
drive = fdt_getprop_u32_default_node(fdt, offset, 0,
"drive-strength", 0);
if (drive) {
if (drive <= 10)
drive = 0;
else if (drive <= 20)
drive = 1;
else if (drive <= 30)
drive = 2;
else
drive = 3;
} else {
drive = fdt_getprop_u32_default_node(fdt, offset, 0,
"allwinner,drive",
0);
drive = min(drive, 3);
}
if (fdt_get_property(fdt, offset, "bias-disable", NULL))
pull = 0;
else if (fdt_get_property(fdt, offset, "bias-pull-up", NULL))
pull = 1;
else if (fdt_get_property(fdt, offset, "bias-pull-down", NULL))
pull = 2;
else
pull = fdt_getprop_u32_default_node(fdt, offset, 0,
"allwinner,pull",
0);
pull = min(pull, 2);
for (i = 0; ; i++) {
pin_name = fdt_stringlist_get(fdt, offset,
"pins", i, NULL);
if (!pin_name) {
pin_name = fdt_stringlist_get(fdt, offset,
"allwinner,pins",
i, NULL);
if (!pin_name)
break;
}
pin = sunxi_name_to_gpio(pin_name);
if (pin < 0)
break;
if (IS_ENABLED(CONFIG_MACH_SUN50I) ||
IS_ENABLED(CONFIG_SUN50I_GEN_H6))
sunxi_gpio_set_cfgpin(pin, SUN50I_GPC_SPI0);
else
sunxi_gpio_set_cfgpin(pin, SUNXI_GPC_SPI0);
sunxi_gpio_set_drv(pin, drive);
sunxi_gpio_set_pull(pin, pull);
}
}
return 0;
}
static inline int sun4i_spi_set_clock(struct udevice *dev, bool enable)
{
struct sun4i_spi_priv *priv = dev_get_priv(dev);
int ret;
if (!enable) {
clk_disable(&priv->clk_ahb);
clk_disable(&priv->clk_mod);
if (reset_valid(&priv->reset))
reset_assert(&priv->reset);
return 0;
}
ret = clk_enable(&priv->clk_ahb);
if (ret) {
dev_err(dev, "failed to enable ahb clock (ret=%d)\n", ret);
return ret;
}
ret = clk_enable(&priv->clk_mod);
if (ret) {
dev_err(dev, "failed to enable mod clock (ret=%d)\n", ret);
goto err_ahb;
}
if (reset_valid(&priv->reset)) {
ret = reset_deassert(&priv->reset);
if (ret) {
dev_err(dev, "failed to deassert reset\n");
goto err_mod;
}
}
return 0;
err_mod:
clk_disable(&priv->clk_mod);
err_ahb:
clk_disable(&priv->clk_ahb);
return ret;
}
static int sun4i_spi_claim_bus(struct udevice *dev)
{
struct sun4i_spi_priv *priv = dev_get_priv(dev->parent);
int ret;
ret = sun4i_spi_set_clock(dev->parent, true);
if (ret)
return ret;
setbits_le32(SPI_REG(priv, SPI_GCR), SUN4I_CTL_ENABLE |
SUN4I_CTL_MASTER | SPI_BIT(priv, SPI_GCR_TP));
if (priv->variant->has_soft_reset)
setbits_le32(SPI_REG(priv, SPI_GCR),
SPI_BIT(priv, SPI_GCR_SRST));
setbits_le32(SPI_REG(priv, SPI_TCR), SPI_BIT(priv, SPI_TCR_CS_MANUAL) |
SPI_BIT(priv, SPI_TCR_CS_ACTIVE_LOW));
return 0;
}
static int sun4i_spi_release_bus(struct udevice *dev)
{
struct sun4i_spi_priv *priv = dev_get_priv(dev->parent);
clrbits_le32(SPI_REG(priv, SPI_GCR), SUN4I_CTL_ENABLE);
sun4i_spi_set_clock(dev->parent, false);
return 0;
}
static int sun4i_spi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
struct udevice *bus = dev->parent;
struct sun4i_spi_priv *priv = dev_get_priv(bus);
struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
u32 len = bitlen / 8;
u32 rx_fifocnt;
u8 nbytes;
int ret;
priv->tx_buf = dout;
priv->rx_buf = din;
if (bitlen % 8) {
debug("%s: non byte-aligned SPI transfer.\n", __func__);
return -ENAVAIL;
}
if (flags & SPI_XFER_BEGIN)
sun4i_spi_set_cs(bus, slave_plat->cs, true);
/* Reset FIFOs */
setbits_le32(SPI_REG(priv, SPI_FCR), SPI_BIT(priv, SPI_FCR_RF_RST) |
SPI_BIT(priv, SPI_FCR_TF_RST));
while (len) {
/* Setup the transfer now... */
nbytes = min(len, (priv->variant->fifo_depth - 1));
/* Setup the counters */
writel(SUN4I_BURST_CNT(nbytes), SPI_REG(priv, SPI_BC));
writel(SUN4I_XMIT_CNT(nbytes), SPI_REG(priv, SPI_TC));
if (priv->variant->has_burst_ctl)
writel(SUN4I_BURST_CNT(nbytes),
SPI_REG(priv, SPI_BCTL));
/* Fill the TX FIFO */
sun4i_spi_fill_fifo(priv, nbytes);
/* Start the transfer */
setbits_le32(SPI_REG(priv, SPI_TCR),
SPI_BIT(priv, SPI_TCR_XCH));
/* Wait till RX FIFO to be empty */
ret = readl_poll_timeout(SPI_REG(priv, SPI_FSR),
rx_fifocnt,
(((rx_fifocnt &
SPI_BIT(priv, SPI_FSR_RF_CNT_MASK)) >>
SUN4I_FIFO_STA_RF_CNT_BITS) >= nbytes),
SUN4I_SPI_TIMEOUT_US);
if (ret < 0) {
printf("ERROR: sun4i_spi: Timeout transferring data\n");
sun4i_spi_set_cs(bus, slave_plat->cs, false);
return ret;
}
/* Drain the RX FIFO */
sun4i_spi_drain_fifo(priv, nbytes);
len -= nbytes;
}
if (flags & SPI_XFER_END)
sun4i_spi_set_cs(bus, slave_plat->cs, false);
return 0;
}
static int sun4i_spi_set_speed(struct udevice *dev, uint speed)
{
struct sun4i_spi_plat *plat = dev_get_plat(dev);
struct sun4i_spi_priv *priv = dev_get_priv(dev);
unsigned int div;
u32 reg;
if (speed > plat->max_hz)
speed = plat->max_hz;
if (speed < SUN4I_SPI_MIN_RATE)
speed = SUN4I_SPI_MIN_RATE;
/*
* Setup clock divider.
*
* We have two choices there. Either we can use the clock
* divide rate 1, which is calculated thanks to this formula:
* SPI_CLK = MOD_CLK / (2 ^ (cdr + 1))
* Or we can use CDR2, which is calculated with the formula:
* SPI_CLK = MOD_CLK / (2 * (cdr + 1))
* Whether we use the former or the latter is set through the
* DRS bit.
*
* First try CDR2, and if we can't reach the expected
* frequency, fall back to CDR1.
*/
div = SUN4I_SPI_MAX_RATE / (2 * speed);
reg = readl(SPI_REG(priv, SPI_CCR));
if (div <= (SUN4I_CLK_CTL_CDR2_MASK + 1)) {
if (div > 0)
div--;
reg &= ~(SUN4I_CLK_CTL_CDR2_MASK | SUN4I_CLK_CTL_DRS);
reg |= SUN4I_CLK_CTL_CDR2(div) | SUN4I_CLK_CTL_DRS;
} else {
div = __ilog2(SUN4I_SPI_MAX_RATE) - __ilog2(speed);
reg &= ~((SUN4I_CLK_CTL_CDR1_MASK << 8) | SUN4I_CLK_CTL_DRS);
reg |= SUN4I_CLK_CTL_CDR1(div);
}
priv->freq = speed;
writel(reg, SPI_REG(priv, SPI_CCR));
return 0;
}
static int sun4i_spi_set_mode(struct udevice *dev, uint mode)
{
struct sun4i_spi_priv *priv = dev_get_priv(dev);
u32 reg;
reg = readl(SPI_REG(priv, SPI_TCR));
reg &= ~(SPI_BIT(priv, SPI_TCR_CPOL) | SPI_BIT(priv, SPI_TCR_CPHA));
if (mode & SPI_CPOL)
reg |= SPI_BIT(priv, SPI_TCR_CPOL);
if (mode & SPI_CPHA)
reg |= SPI_BIT(priv, SPI_TCR_CPHA);
priv->mode = mode;
writel(reg, SPI_REG(priv, SPI_TCR));
return 0;
}
static const struct dm_spi_ops sun4i_spi_ops = {
.claim_bus = sun4i_spi_claim_bus,
.release_bus = sun4i_spi_release_bus,
.xfer = sun4i_spi_xfer,
.set_speed = sun4i_spi_set_speed,
.set_mode = sun4i_spi_set_mode,
};
static int sun4i_spi_probe(struct udevice *bus)
{
struct sun4i_spi_plat *plat = dev_get_plat(bus);
struct sun4i_spi_priv *priv = dev_get_priv(bus);
int ret;
ret = clk_get_by_name(bus, "ahb", &priv->clk_ahb);
if (ret) {
dev_err(bus, "failed to get ahb clock\n");
return ret;
}
ret = clk_get_by_name(bus, "mod", &priv->clk_mod);
if (ret) {
dev_err(bus, "failed to get mod clock\n");
return ret;
}
ret = reset_get_by_index(bus, 0, &priv->reset);
if (ret && ret != -ENOENT) {
dev_err(bus, "failed to get reset\n");
return ret;
}
sun4i_spi_parse_pins(bus);
priv->variant = plat->variant;
priv->base = plat->base;
priv->freq = plat->max_hz;
return 0;
}
static int sun4i_spi_of_to_plat(struct udevice *bus)
{
struct sun4i_spi_plat *plat = dev_get_plat(bus);
int node = dev_of_offset(bus);
plat->base = dev_read_addr(bus);
plat->variant = (struct sun4i_spi_variant *)dev_get_driver_data(bus);
plat->max_hz = fdtdec_get_int(gd->fdt_blob, node,
"spi-max-frequency",
SUN4I_SPI_DEFAULT_RATE);
if (plat->max_hz > SUN4I_SPI_MAX_RATE)
plat->max_hz = SUN4I_SPI_MAX_RATE;
return 0;
}
static const unsigned long sun4i_spi_regs[] = {
[SPI_GCR] = SUN4I_CTL_REG,
[SPI_TCR] = SUN4I_CTL_REG,
[SPI_FCR] = SUN4I_CTL_REG,
[SPI_FSR] = SUN4I_FIFO_STA_REG,
[SPI_CCR] = SUN4I_CLK_CTL_REG,
[SPI_BC] = SUN4I_BURST_CNT_REG,
[SPI_TC] = SUN4I_XMIT_CNT_REG,
[SPI_TXD] = SUN4I_TXDATA_REG,
[SPI_RXD] = SUN4I_RXDATA_REG,
};
static const u32 sun4i_spi_bits[] = {
[SPI_GCR_TP] = BIT(18),
[SPI_TCR_CPHA] = BIT(2),
[SPI_TCR_CPOL] = BIT(3),
[SPI_TCR_CS_ACTIVE_LOW] = BIT(4),
[SPI_TCR_XCH] = BIT(10),
[SPI_TCR_CS_SEL] = 12,
[SPI_TCR_CS_MASK] = 0x3000,
[SPI_TCR_CS_MANUAL] = BIT(16),
[SPI_TCR_CS_LEVEL] = BIT(17),
[SPI_FCR_TF_RST] = BIT(8),
[SPI_FCR_RF_RST] = BIT(9),
[SPI_FSR_RF_CNT_MASK] = GENMASK(6, 0),
};
static const unsigned long sun6i_spi_regs[] = {
[SPI_GCR] = SUN6I_GBL_CTL_REG,
[SPI_TCR] = SUN6I_TFR_CTL_REG,
[SPI_FCR] = SUN6I_FIFO_CTL_REG,
[SPI_FSR] = SUN6I_FIFO_STA_REG,
[SPI_CCR] = SUN6I_CLK_CTL_REG,
[SPI_BC] = SUN6I_BURST_CNT_REG,
[SPI_TC] = SUN6I_XMIT_CNT_REG,
[SPI_BCTL] = SUN6I_BURST_CTL_REG,
[SPI_TXD] = SUN6I_TXDATA_REG,
[SPI_RXD] = SUN6I_RXDATA_REG,
};
static const u32 sun6i_spi_bits[] = {
[SPI_GCR_TP] = BIT(7),
[SPI_GCR_SRST] = BIT(31),
[SPI_TCR_CPHA] = BIT(0),
[SPI_TCR_CPOL] = BIT(1),
[SPI_TCR_CS_ACTIVE_LOW] = BIT(2),
[SPI_TCR_CS_SEL] = 4,
[SPI_TCR_CS_MASK] = 0x30,
[SPI_TCR_CS_MANUAL] = BIT(6),
[SPI_TCR_CS_LEVEL] = BIT(7),
[SPI_TCR_XCH] = BIT(31),
[SPI_FCR_RF_RST] = BIT(15),
[SPI_FCR_TF_RST] = BIT(31),
[SPI_FSR_RF_CNT_MASK] = GENMASK(7, 0),
};
static const struct sun4i_spi_variant sun4i_a10_spi_variant = {
.regs = sun4i_spi_regs,
.bits = sun4i_spi_bits,
.fifo_depth = 64,
};
static const struct sun4i_spi_variant sun6i_a31_spi_variant = {
.regs = sun6i_spi_regs,
.bits = sun6i_spi_bits,
.fifo_depth = 128,
.has_soft_reset = true,
.has_burst_ctl = true,
};
static const struct sun4i_spi_variant sun8i_h3_spi_variant = {
.regs = sun6i_spi_regs,
.bits = sun6i_spi_bits,
.fifo_depth = 64,
.has_soft_reset = true,
.has_burst_ctl = true,
};
static const struct udevice_id sun4i_spi_ids[] = {
{
.compatible = "allwinner,sun4i-a10-spi",
.data = (ulong)&sun4i_a10_spi_variant,
},
{
.compatible = "allwinner,sun6i-a31-spi",
.data = (ulong)&sun6i_a31_spi_variant,
},
{
.compatible = "allwinner,sun8i-h3-spi",
.data = (ulong)&sun8i_h3_spi_variant,
},
{ /* sentinel */ }
};
U_BOOT_DRIVER(sun4i_spi) = {
.name = "sun4i_spi",
.id = UCLASS_SPI,
.of_match = sun4i_spi_ids,
.ops = &sun4i_spi_ops,
.of_to_plat = sun4i_spi_of_to_plat,
.plat_auto = sizeof(struct sun4i_spi_plat),
.priv_auto = sizeof(struct sun4i_spi_priv),
.probe = sun4i_spi_probe,
};
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