+++ /dev/null
-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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