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openwrt/target/linux/ramips/patches-3.10/0215-SPI-ralink-add-mt7621-...

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From 1a961f146e65e2716dbe9065baa4c0931fcb6b3e Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sun, 16 Mar 2014 05:34:11 +0000
Subject: [PATCH 215/215] SPI: ralink: add mt7621 support
Signed-off-by: John Crispin <blogic@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
@@ -21,8 +21,13 @@
#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
@@ -63,6 +68,25 @@
/* SPIFIFOSTAT register bit field */
#define SPIFIFOSTAT_TXFULL BIT(17)
+#define MT7621_SPI_TRANS 0x00
+#define SPITRANS_BUSY BIT(16)
+#define MT7621_SPI_OPCODE 0x04
+#define MT7621_SPI_DATA0 0x08
+#define SPI_CTL_TX_RX_CNT_MASK 0xff
+#define SPI_CTL_START BIT(8)
+#define MT7621_SPI_POLAR 0x38
+#define MT7621_SPI_MASTER 0x28
+#define MT7621_SPI_SPACE 0x3c
+
+struct rt2880_spi;
+
+struct rt2880_spi_ops {
+ void (*init_hw)(struct rt2880_spi *rs);
+ void (*set_cs)(struct rt2880_spi *rs, int enable);
+ int (*baudrate_set)(struct spi_device *spi, unsigned int speed);
+ unsigned int (*write_read)(struct spi_device *spi, struct list_head *list, struct spi_transfer *xfer);
+};
+
struct rt2880_spi {
struct spi_master *master;
void __iomem *base;
@@ -70,6 +94,8 @@ 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)
@@ -149,6 +175,17 @@ static int rt2880_spi_baudrate_set(struc
return 0;
}
+static int mt7621_spi_baudrate_set(struct spi_device *spi, unsigned int speed)
+{
+/* u32 master = rt2880_spi_read(rs, MT7621_SPI_MASTER);
+
+ // set default clock to hclk/5
+ master &= ~(0xfff << 16);
+ master |= 0x3 << 16;
+*/
+ return 0;
+}
+
/*
* called only when no transfer is active on the bus
*/
@@ -164,7 +201,7 @@ rt2880_spi_setup_transfer(struct spi_dev
if (rs->speed != speed) {
dev_dbg(&spi->dev, "speed_hz:%u\n", speed);
- rc = rt2880_spi_baudrate_set(spi, speed);
+ rc = rs->ops->baudrate_set(spi, speed);
if (rc)
return rc;
}
@@ -180,6 +217,17 @@ static void rt2880_spi_set_cs(struct rt2
rt2880_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA);
}
+static void mt7621_spi_set_cs(struct rt2880_spi *rs, int enable)
+{
+ u32 polar = rt2880_spi_read(rs, MT7621_SPI_POLAR);
+
+ if (enable)
+ polar |= 1;
+ else
+ polar &= ~1;
+ rt2880_spi_write(rs, MT7621_SPI_POLAR, polar);
+}
+
static inline int rt2880_spi_wait_till_ready(struct rt2880_spi *rs)
{
int i;
@@ -198,8 +246,26 @@ static inline int rt2880_spi_wait_till_r
return -ETIMEDOUT;
}
+static inline int mt7621_spi_wait_till_ready(struct rt2880_spi *rs)
+{
+ int i;
+
+ for (i = 0; i < RALINK_SPI_WAIT_MAX_LOOP; i++) {
+ u32 status;
+
+ status = rt2880_spi_read(rs, MT7621_SPI_TRANS);
+ if ((status & SPITRANS_BUSY) == 0) {
+ return 0;
+ }
+ cpu_relax();
+ udelay(1);
+ }
+
+ return -ETIMEDOUT;
+}
+
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);
unsigned count = 0;
@@ -239,6 +305,100 @@ out:
return count;
}
+static unsigned int
+mt7621_spi_write_read(struct spi_device *spi, struct list_head *list, struct spi_transfer *xfer)
+{
+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
+ struct spi_transfer *next = NULL;
+ const u8 *tx = xfer->tx_buf;
+ u8 *rx = NULL;
+ u32 trans;
+ int len = xfer->len;
+
+ if (!tx)
+ return 0;
+
+ if (!list_is_last(&xfer->transfer_list, list)) {
+ next = list_entry(xfer->transfer_list.next, struct spi_transfer, transfer_list);
+ rx = next->rx_buf;
+ }
+
+ trans = rt2880_spi_read(rs, MT7621_SPI_TRANS);
+ trans &= ~SPI_CTL_TX_RX_CNT_MASK;
+
+ if (tx) {
+ u32 data0 = 0, opcode = 0;
+
+ switch (xfer->len) {
+ case 8:
+ data0 |= tx[7] << 24;
+ case 7:
+ data0 |= tx[6] << 16;
+ case 6:
+ data0 |= tx[5] << 8;
+ case 5:
+ data0 |= tx[4];
+ case 4:
+ opcode |= tx[3] << 8;
+ case 3:
+ opcode |= tx[2] << 16;
+ case 2:
+ opcode |= tx[1] << 24;
+ case 1:
+ opcode |= tx[0];
+ break;
+
+ default:
+ dev_err(&spi->dev, "trying to write too many bytes: %d\n", next->len);
+ return -EINVAL;
+ }
+
+ rt2880_spi_write(rs, MT7621_SPI_DATA0, data0);
+ rt2880_spi_write(rs, MT7621_SPI_OPCODE, opcode);
+ trans |= xfer->len;
+ }
+
+ if (rx)
+ trans |= (next->len << 4);
+ rt2880_spi_write(rs, MT7621_SPI_TRANS, trans);
+ trans |= SPI_CTL_START;
+ rt2880_spi_write(rs, MT7621_SPI_TRANS, trans);
+
+ mt7621_spi_wait_till_ready(rs);
+
+ if (rx) {
+ u32 data0 = rt2880_spi_read(rs, MT7621_SPI_DATA0);
+ u32 opcode = rt2880_spi_read(rs, MT7621_SPI_OPCODE);
+
+ switch (next->len) {
+ case 8:
+ rx[7] = (opcode >> 24) & 0xff;
+ case 7:
+ rx[6] = (opcode >> 16) & 0xff;
+ case 6:
+ rx[5] = (opcode >> 8) & 0xff;
+ case 5:
+ rx[4] = opcode & 0xff;
+ case 4:
+ rx[3] = (data0 >> 24) & 0xff;
+ case 3:
+ rx[2] = (data0 >> 16) & 0xff;
+ case 2:
+ rx[1] = (data0 >> 8) & 0xff;
+ case 1:
+ rx[0] = data0 & 0xff;
+ break;
+
+ default:
+ dev_err(&spi->dev, "trying to read too many bytes: %d\n", next->len);
+ return -EINVAL;
+ }
+ len += next->len;
+ }
+
+ return len;
+}
+
static int rt2880_spi_transfer_one_message(struct spi_master *master,
struct spi_message *m)
{
@@ -280,25 +440,25 @@ static int rt2880_spi_transfer_one_messa
}
if (!cs_active) {
- rt2880_spi_set_cs(rs, 1);
+ rs->ops->set_cs(rs, 1);
cs_active = 1;
}
if (t->len)
- m->actual_length += rt2880_spi_write_read(spi, t);
+ m->actual_length += rs->ops->write_read(spi, &m->transfers, t);
if (t->delay_usecs)
udelay(t->delay_usecs);
if (t->cs_change) {
- rt2880_spi_set_cs(rs, 0);
+ rs->ops->set_cs(rs, 0);
cs_active = 0;
}
}
msg_done:
if (cs_active)
- rt2880_spi_set_cs(rs, 0);
+ rs->ops->set_cs(rs, 0);
m->status = status;
spi_finalize_current_message(master);
@@ -334,8 +494,41 @@ static void rt2880_spi_reset(struct rt28
rt2880_spi_write(rs, RAMIPS_SPI_CTL, SPICTL_HIZSDO | SPICTL_SPIENA);
}
+static void mt7621_spi_reset(struct rt2880_spi *rs)
+{
+ u32 master = rt2880_spi_read(rs, MT7621_SPI_MASTER);
+
+ master &= ~(0xfff << 16);
+ master |= 3 << 16;
+
+ master |= 7 << 29;
+ rt2880_spi_write(rs, MT7621_SPI_MASTER, master);
+}
+
+static struct rt2880_spi_ops spi_ops[] = {
+ {
+ .init_hw = rt2880_spi_reset,
+ .set_cs = rt2880_spi_set_cs,
+ .baudrate_set = rt2880_spi_baudrate_set,
+ .write_read = rt2880_spi_write_read,
+ }, {
+ .init_hw = mt7621_spi_reset,
+ .set_cs = mt7621_spi_set_cs,
+ .baudrate_set = mt7621_spi_baudrate_set,
+ .write_read = mt7621_spi_write_read,
+ },
+};
+
+static const struct of_device_id rt2880_spi_match[] = {
+ { .compatible = "ralink,rt2880-spi", .data = &spi_ops[0]},
+ { .compatible = "ralink,mt7621-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;
@@ -344,6 +537,10 @@ static int rt2880_spi_probe(struct platf
int status = 0;
struct clk *clk;
+ match = of_match_device(rt2880_spi_match, &pdev->dev);
+ if (!match)
+ return -EINVAL;
+
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, r);
if (IS_ERR(base))
@@ -382,12 +579,13 @@ static int rt2880_spi_probe(struct platf
rs->clk = clk;
rs->master = master;
rs->sys_freq = clk_get_rate(rs->clk);
+ rs->ops = (struct rt2880_spi_ops *) match->data;
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 +606,6 @@ 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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