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openwrt/target/linux/ramips/patches-3.14/0051-rt5350-spi-second-device.patch
Felix Fietkau aefd3c569c ramips: split mt7621 spi into a separate driver, increase maximum transfer size 
Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 43807
2015-01-02 21:52:53 +00:00

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10 KiB
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From 27b11d4f1888e1a3d6d75b46d4d5a4d86fc03891 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Wed, 6 Aug 2014 10:53:40 +0200
Subject: [PATCH 51/57] SPI: MIPS: ralink: add rt5350 dual SPI support
Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
drivers/spi/spi-rt2880.c | 218 +++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 205 insertions(+), 13 deletions(-)
--- a/drivers/spi/spi-rt2880.c
+++ b/drivers/spi/spi-rt2880.c
@@ -21,19 +21,25 @@
#include <linux/io.h>
#include <linux/reset.h>
#include <linux/spi/spi.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
+#include <ralink_regs.h>
+
+#define SPI_BPW_MASK(bits) BIT((bits) - 1)
+
#define DRIVER_NAME "spi-rt2880"
-/* only one slave is supported*/
-#define RALINK_NUM_CHIPSELECTS 1
/* in usec */
#define RALINK_SPI_WAIT_MAX_LOOP 2000
-#define RAMIPS_SPI_STAT 0x00
-#define RAMIPS_SPI_CFG 0x10
-#define RAMIPS_SPI_CTL 0x14
-#define RAMIPS_SPI_DATA 0x20
-#define RAMIPS_SPI_FIFO_STAT 0x38
+#define RAMIPS_SPI_DEV_OFFSET 0x40
+
+#define RAMIPS_SPI_STAT(cs) (0x00 + (cs * RAMIPS_SPI_DEV_OFFSET))
+#define RAMIPS_SPI_CFG(cs) (0x10 + (cs * RAMIPS_SPI_DEV_OFFSET))
+#define RAMIPS_SPI_CTL(cs) (0x14 + (cs * RAMIPS_SPI_DEV_OFFSET))
+#define RAMIPS_SPI_DATA(cs) (0x20 + (cs * RAMIPS_SPI_DEV_OFFSET))
+#define RAMIPS_SPI_FIFO_STAT(cs) (0x38 + (cs * RAMIPS_SPI_DEV_OFFSET))
+#define RAMIPS_SPI_ARBITER 0xF0
/* SPISTAT register bit field */
#define SPISTAT_BUSY BIT(0)
@@ -63,6 +69,19 @@
/* SPIFIFOSTAT register bit field */
#define SPIFIFOSTAT_TXFULL BIT(17)
+#define SPICTL_ARB_EN BIT(31)
+#define SPI1_POR BIT(1)
+#define SPI0_POR BIT(0)
+
+#define RT2880_SPI_MODE_BITS (SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH)
+
+struct rt2880_spi;
+
+struct rt2880_spi_ops {
+ void (*init_hw)(struct rt2880_spi *rs);
+ int num_cs;
+};
+
struct rt2880_spi {
struct spi_master *master;
void __iomem *base;
@@ -70,6 +89,8 @@ struct rt2880_spi {
unsigned int speed;
struct clk *clk;
spinlock_t lock;
+
+ struct rt2880_spi_ops *ops;
};
static inline struct rt2880_spi *spidev_to_rt2880_spi(struct spi_device *spi)
@@ -115,6 +136,7 @@ static inline void rt2880_spi_clrbits(st
static int rt2880_spi_baudrate_set(struct spi_device *spi, unsigned int speed)
{
+ int cs = spi->chip_select;
struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
u32 rate;
u32 prescale;
@@ -142,9 +164,9 @@ static int rt2880_spi_baudrate_set(struc
prescale = ilog2(rate / 2);
dev_dbg(&spi->dev, "prescale:%u\n", prescale);
- reg = rt2880_spi_read(rs, RAMIPS_SPI_CFG);
+ reg = rt2880_spi_read(rs, RAMIPS_SPI_CFG(cs));
reg = ((reg & ~SPICFG_SPICLK_PRESCALE_MASK) | prescale);
- rt2880_spi_write(rs, RAMIPS_SPI_CFG, reg);
+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(cs), reg);
rs->speed = speed;
return 0;
}
@@ -157,7 +179,8 @@ rt2880_spi_setup_transfer(struct spi_dev
{
struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
unsigned int speed = spi->max_speed_hz;
- int rc;
+ int rc, cs = spi->chip_select;
+ u32 reg;
if ((t != NULL) && t->speed_hz)
speed = t->speed_hz;
@@ -169,25 +192,68 @@ rt2880_spi_setup_transfer(struct spi_dev
return rc;
}
+ reg = rt2880_spi_read(rs, RAMIPS_SPI_CFG(cs));
+
+ reg = (reg & ~SPICFG_MSBFIRST);
+ if (!(spi->mode & SPI_LSB_FIRST))
+ reg |= SPICFG_MSBFIRST;
+
+ reg = (reg & ~(SPICFG_SPICLKPOL | SPICFG_RXCLKEDGE_FALLING |SPICFG_TXCLKEDGE_FALLING));
+ switch(spi->mode & (SPI_CPOL | SPI_CPHA)) {
+ case SPI_MODE_0:
+ reg |= SPICFG_SPICLKPOL | SPICFG_TXCLKEDGE_FALLING;
+ break;
+ case SPI_MODE_1:
+ reg |= SPICFG_SPICLKPOL | SPICFG_RXCLKEDGE_FALLING;
+ break;
+ case SPI_MODE_2:
+ reg |= SPICFG_RXCLKEDGE_FALLING;
+ break;
+ case SPI_MODE_3:
+ reg |= SPICFG_TXCLKEDGE_FALLING;
+ break;
+ }
+
+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(cs), reg);
+
+ reg = SPICTL_ARB_EN;
+ if (spi->mode & SPI_CS_HIGH) {
+ switch(cs) {
+ case 0:
+ reg |= SPI0_POR;
+ break;
+ case 1:
+ reg |= SPI1_POR;
+ break;
+ }
+ }
+
+ rt2880_spi_write(rs, RAMIPS_SPI_ARBITER, reg);
+
return 0;
}
-static void rt2880_spi_set_cs(struct rt2880_spi *rs, int enable)
+static void rt2880_spi_set_cs(struct spi_device *spi, int enable)
{
+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
+ int cs = spi->chip_select;
+
if (enable)
- rt2880_spi_clrbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA);
+ rt2880_spi_clrbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_SPIENA);
else
- rt2880_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA);
+ rt2880_spi_setbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_SPIENA);
}
-static inline int rt2880_spi_wait_till_ready(struct rt2880_spi *rs)
+static inline int rt2880_spi_wait_till_ready(struct spi_device *spi)
{
+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
+ int cs = spi->chip_select;
int i;
for (i = 0; i < RALINK_SPI_WAIT_MAX_LOOP; i++) {
u32 status;
- status = rt2880_spi_read(rs, RAMIPS_SPI_STAT);
+ status = rt2880_spi_read(rs, RAMIPS_SPI_STAT(cs));
if ((status & SPISTAT_BUSY) == 0)
return 0;
@@ -199,9 +265,10 @@ static inline int rt2880_spi_wait_till_r
}
static unsigned int
-rt2880_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)
+rt2880_spi_write_read(struct spi_device *spi, struct list_head *list, struct spi_transfer *xfer)
{
struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
+ int cs = spi->chip_select;
unsigned count = 0;
u8 *rx = xfer->rx_buf;
const u8 *tx = xfer->tx_buf;
@@ -213,9 +280,9 @@ rt2880_spi_write_read(struct spi_device
if (tx) {
for (count = 0; count < xfer->len; count++) {
- rt2880_spi_write(rs, RAMIPS_SPI_DATA, tx[count]);
- rt2880_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_STARTWR);
- err = rt2880_spi_wait_till_ready(rs);
+ rt2880_spi_write(rs, RAMIPS_SPI_DATA(cs), tx[count]);
+ rt2880_spi_setbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_STARTWR);
+ err = rt2880_spi_wait_till_ready(spi);
if (err) {
dev_err(&spi->dev, "TX failed, err=%d\n", err);
goto out;
@@ -225,13 +292,13 @@ rt2880_spi_write_read(struct spi_device
if (rx) {
for (count = 0; count < xfer->len; count++) {
- rt2880_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_STARTRD);
- err = rt2880_spi_wait_till_ready(rs);
+ rt2880_spi_setbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_STARTRD);
+ err = rt2880_spi_wait_till_ready(spi);
if (err) {
dev_err(&spi->dev, "RX failed, err=%d\n", err);
goto out;
}
- rx[count] = (u8) rt2880_spi_read(rs, RAMIPS_SPI_DATA);
+ rx[count] = (u8) rt2880_spi_read(rs, RAMIPS_SPI_DATA(cs));
}
}
@@ -280,25 +347,25 @@ static int rt2880_spi_transfer_one_messa
}
if (!cs_active) {
- rt2880_spi_set_cs(rs, 1);
+ rt2880_spi_set_cs(spi, 1);
cs_active = 1;
}
if (t->len)
- m->actual_length += rt2880_spi_write_read(spi, t);
+ m->actual_length += rt2880_spi_write_read(spi, &m->transfers, t);
if (t->delay_usecs)
udelay(t->delay_usecs);
if (t->cs_change) {
- rt2880_spi_set_cs(rs, 0);
+ rt2880_spi_set_cs(spi, 0);
cs_active = 0;
}
}
msg_done:
if (cs_active)
- rt2880_spi_set_cs(rs, 0);
+ rt2880_spi_set_cs(spi, 0);
m->status = status;
spi_finalize_current_message(master);
@@ -311,7 +378,7 @@ static int rt2880_spi_setup(struct spi_d
struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
if ((spi->max_speed_hz == 0) ||
- (spi->max_speed_hz > (rs->sys_freq / 2)))
+ (spi->max_speed_hz > (rs->sys_freq / 2)))
spi->max_speed_hz = (rs->sys_freq / 2);
if (spi->max_speed_hz < (rs->sys_freq / 128)) {
@@ -328,14 +395,47 @@ static int rt2880_spi_setup(struct spi_d
static void rt2880_spi_reset(struct rt2880_spi *rs)
{
- rt2880_spi_write(rs, RAMIPS_SPI_CFG,
+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(0),
SPICFG_MSBFIRST | SPICFG_TXCLKEDGE_FALLING |
SPICFG_SPICLK_DIV16 | SPICFG_SPICLKPOL);
- rt2880_spi_write(rs, RAMIPS_SPI_CTL, SPICTL_HIZSDO | SPICTL_SPIENA);
+ rt2880_spi_write(rs, RAMIPS_SPI_CTL(0), SPICTL_HIZSDO | SPICTL_SPIENA);
}
+static void rt5350_spi_reset(struct rt2880_spi *rs)
+{
+ int cs;
+
+ rt2880_spi_write(rs, RAMIPS_SPI_ARBITER,
+ SPICTL_ARB_EN);
+
+ for (cs = 0; cs < rs->ops->num_cs; cs++) {
+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(cs),
+ SPICFG_MSBFIRST | SPICFG_TXCLKEDGE_FALLING |
+ SPICFG_SPICLK_DIV16 | SPICFG_SPICLKPOL);
+ rt2880_spi_write(rs, RAMIPS_SPI_CTL(cs), SPICTL_HIZSDO | SPICTL_SPIENA);
+ }
+}
+
+static struct rt2880_spi_ops spi_ops[] = {
+ {
+ .init_hw = rt2880_spi_reset,
+ .num_cs = 1,
+ }, {
+ .init_hw = rt5350_spi_reset,
+ .num_cs = 2,
+ },
+};
+
+static const struct of_device_id rt2880_spi_match[] = {
+ { .compatible = "ralink,rt2880-spi", .data = &spi_ops[0]},
+ { .compatible = "ralink,rt5350-spi", .data = &spi_ops[1]},
+ {},
+};
+MODULE_DEVICE_TABLE(of, rt2880_spi_match);
+
static int rt2880_spi_probe(struct platform_device *pdev)
{
+ const struct of_device_id *match;
struct spi_master *master;
struct rt2880_spi *rs;
unsigned long flags;
@@ -343,6 +443,12 @@ static int rt2880_spi_probe(struct platf
struct resource *r;
int status = 0;
struct clk *clk;
+ struct rt2880_spi_ops *ops;
+
+ match = of_match_device(rt2880_spi_match, &pdev->dev);
+ if (!match)
+ return -EINVAL;
+ ops = (struct rt2880_spi_ops *)match->data;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, r);
@@ -366,14 +472,13 @@ static int rt2880_spi_probe(struct platf
return -ENOMEM;
}
- /* we support only mode 0, and no options */
- master->mode_bits = 0;
+ master->mode_bits = RT2880_SPI_MODE_BITS;
master->setup = rt2880_spi_setup;
master->transfer_one_message = rt2880_spi_transfer_one_message;
- master->num_chipselect = RALINK_NUM_CHIPSELECTS;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->dev.of_node = pdev->dev.of_node;
+ master->num_chipselect = ops->num_cs;
dev_set_drvdata(&pdev->dev, master);
@@ -382,12 +487,13 @@ static int rt2880_spi_probe(struct platf
rs->clk = clk;
rs->master = master;
rs->sys_freq = clk_get_rate(rs->clk);
+ rs->ops = ops;
dev_dbg(&pdev->dev, "sys_freq: %u\n", rs->sys_freq);
spin_lock_irqsave(&rs->lock, flags);
device_reset(&pdev->dev);
- rt2880_spi_reset(rs);
+ rs->ops->init_hw(rs);
return spi_register_master(master);
}
@@ -408,12 +514,6 @@ static int rt2880_spi_remove(struct plat
MODULE_ALIAS("platform:" DRIVER_NAME);
-static const struct of_device_id rt2880_spi_match[] = {
- { .compatible = "ralink,rt2880-spi" },
- {},
-};
-MODULE_DEVICE_TABLE(of, rt2880_spi_match);
-
static struct platform_driver rt2880_spi_driver = {
.driver = {
.name = DRIVER_NAME,
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