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path: root/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c
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Diffstat (limited to 'target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c')
-rw-r--r--target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c99
1 files changed, 66 insertions, 33 deletions
diff --git a/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c b/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c
index f7f148a..56260ff 100644
--- a/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c
+++ b/target/linux/ar71xx/files/drivers/spi/spi-rb4xx.c
@@ -12,7 +12,10 @@
*
*/
+#include <linux/clk.h>
+#include <linux/err.h>
#include <linux/kernel.h>
+#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
@@ -20,7 +23,8 @@
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
-#include <asm/mach-ar71xx/ar71xx.h>
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include <asm/mach-ath79/ath79.h>
#define DRV_NAME "rb4xx-spi"
#define DRV_DESC "Mikrotik RB4xx SPI controller driver"
@@ -41,13 +45,16 @@ struct rb4xx_spi {
unsigned spi_ctrl_flash;
unsigned spi_ctrl_fread;
+ struct clk *ahb_clk;
+ unsigned long ahb_freq;
+
spinlock_t lock;
struct list_head queue;
int busy:1;
int cs_wait;
};
-static unsigned spi_clk_low = SPI_IOC_CS1;
+static unsigned spi_clk_low = AR71XX_SPI_IOC_CS1;
#ifdef RB4XX_SPI_DEBUG
static inline void do_spi_delay(void)
@@ -60,10 +67,11 @@ static inline void do_spi_delay(void) { }
static inline void do_spi_init(struct spi_device *spi)
{
- unsigned cs = SPI_IOC_CS0 | SPI_IOC_CS1;
+ unsigned cs = AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1;
if (!(spi->mode & SPI_CS_HIGH))
- cs ^= (spi->chip_select == 2) ? SPI_IOC_CS1 : SPI_IOC_CS0;
+ cs ^= (spi->chip_select == 2) ? AR71XX_SPI_IOC_CS1 :
+ AR71XX_SPI_IOC_CS0;
spi_clk_low = cs;
}
@@ -71,17 +79,18 @@ static inline void do_spi_init(struct spi_device *spi)
static inline void do_spi_finish(void __iomem *base)
{
do_spi_delay();
- __raw_writel(SPI_IOC_CS0 | SPI_IOC_CS1, base + SPI_REG_IOC);
+ __raw_writel(AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1,
+ base + AR71XX_SPI_REG_IOC);
}
static inline void do_spi_clk(void __iomem *base, int bit)
{
- unsigned bval = spi_clk_low | ((bit & 1) ? SPI_IOC_DO : 0);
+ unsigned bval = spi_clk_low | ((bit & 1) ? AR71XX_SPI_IOC_DO : 0);
do_spi_delay();
- __raw_writel(bval, base + SPI_REG_IOC);
+ __raw_writel(bval, base + AR71XX_SPI_REG_IOC);
do_spi_delay();
- __raw_writel(bval | SPI_IOC_CLK, base + SPI_REG_IOC);
+ __raw_writel(bval | AR71XX_SPI_IOC_CLK, base + AR71XX_SPI_REG_IOC);
}
static void do_spi_byte(void __iomem *base, unsigned char byte)
@@ -97,19 +106,19 @@ static void do_spi_byte(void __iomem *base, unsigned char byte)
pr_debug("spi_byte sent 0x%02x got 0x%02x\n",
(unsigned)byte,
- (unsigned char)__raw_readl(base + SPI_REG_RDS));
+ (unsigned char)__raw_readl(base + AR71XX_SPI_REG_RDS));
}
static inline void do_spi_clk_fast(void __iomem *base, unsigned bit1,
unsigned bit2)
{
unsigned bval = (spi_clk_low |
- ((bit1 & 1) ? SPI_IOC_DO : 0) |
- ((bit2 & 1) ? SPI_IOC_CS2 : 0));
+ ((bit1 & 1) ? AR71XX_SPI_IOC_DO : 0) |
+ ((bit2 & 1) ? AR71XX_SPI_IOC_CS2 : 0));
do_spi_delay();
- __raw_writel(bval, base + SPI_REG_IOC);
+ __raw_writel(bval, base + AR71XX_SPI_REG_IOC);
do_spi_delay();
- __raw_writel(bval | SPI_IOC_CLK, base + SPI_REG_IOC);
+ __raw_writel(bval | AR71XX_SPI_IOC_CLK, base + AR71XX_SPI_REG_IOC);
}
static void do_spi_byte_fast(void __iomem *base, unsigned char byte)
@@ -121,7 +130,7 @@ static void do_spi_byte_fast(void __iomem *base, unsigned char byte)
pr_debug("spi_byte_fast sent 0x%02x got 0x%02x\n",
(unsigned)byte,
- (unsigned char) __raw_readl(base + SPI_REG_RDS));
+ (unsigned char) __raw_readl(base + AR71XX_SPI_REG_RDS));
}
static int rb4xx_spi_txrx(void __iomem *base, struct spi_transfer *t)
@@ -150,9 +159,9 @@ static int rb4xx_spi_txrx(void __iomem *base, struct spi_transfer *t)
do_spi_byte(base, sdata);
if (rx_ptr) {
- rx_ptr[i] = __raw_readl(base + SPI_REG_RDS) & 0xff;
+ rx_ptr[i] = __raw_readl(base + AR71XX_SPI_REG_RDS) & 0xff;
} else if (rxv_ptr) {
- unsigned char c = __raw_readl(base + SPI_REG_RDS);
+ unsigned char c = __raw_readl(base + AR71XX_SPI_REG_RDS);
if (rxv_ptr[i] != c)
return i;
}
@@ -201,9 +210,9 @@ static int rb4xx_spi_read_fast(struct rb4xx_spi *rbspi,
if (t->tx_buf && !t->verify)
return -1;
- __raw_writel(SPI_FS_GPIO, base + SPI_REG_FS);
- __raw_writel(rbspi->spi_ctrl_fread, base + SPI_REG_CTRL);
- __raw_writel(0, base + SPI_REG_FS);
+ __raw_writel(AR71XX_SPI_FS_GPIO, base + AR71XX_SPI_REG_FS);
+ __raw_writel(rbspi->spi_ctrl_fread, base + AR71XX_SPI_REG_CTRL);
+ __raw_writel(0, base + AR71XX_SPI_REG_FS);
if (t->rx_buf) {
memcpy(t->rx_buf, (const void *)addr, t->len);
@@ -216,9 +225,9 @@ static int rb4xx_spi_read_fast(struct rb4xx_spi *rbspi,
m->actual_length += t->len;
if (rbspi->spi_ctrl_flash != rbspi->spi_ctrl_fread) {
- __raw_writel(SPI_FS_GPIO, base + SPI_REG_FS);
- __raw_writel(rbspi->spi_ctrl_flash, base + SPI_REG_CTRL);
- __raw_writel(0, base + SPI_REG_FS);
+ __raw_writel(AR71XX_SPI_FS_GPIO, base + AR71XX_SPI_REG_FS);
+ __raw_writel(rbspi->spi_ctrl_flash, base + AR71XX_SPI_REG_CTRL);
+ __raw_writel(0, base + AR71XX_SPI_REG_FS);
}
return 0;
@@ -237,8 +246,8 @@ static int rb4xx_spi_msg(struct rb4xx_spi *rbspi, struct spi_message *m)
if (rb4xx_spi_read_fast(rbspi, m) == 0)
return -1;
- __raw_writel(SPI_FS_GPIO, base + SPI_REG_FS);
- __raw_writel(SPI_CTRL_FASTEST, base + SPI_REG_CTRL);
+ __raw_writel(AR71XX_SPI_FS_GPIO, base + AR71XX_SPI_REG_FS);
+ __raw_writel(SPI_CTRL_FASTEST, base + AR71XX_SPI_REG_CTRL);
do_spi_init(m->spi);
list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -262,8 +271,8 @@ static int rb4xx_spi_msg(struct rb4xx_spi *rbspi, struct spi_message *m)
}
do_spi_finish(base);
- __raw_writel(rbspi->spi_ctrl_flash, base + SPI_REG_CTRL);
- __raw_writel(0, base + SPI_REG_FS);
+ __raw_writel(rbspi->spi_ctrl_flash, base + AR71XX_SPI_REG_CTRL);
+ __raw_writel(0, base + AR71XX_SPI_REG_FS);
return -1;
}
@@ -352,11 +361,12 @@ static int rb4xx_spi_setup(struct spi_device *spi)
return 0;
}
-static unsigned get_spi_ctrl(unsigned hz_max, const char *name)
+static unsigned get_spi_ctrl(struct rb4xx_spi *rbspi, unsigned hz_max,
+ const char *name)
{
unsigned div;
- div = (ar71xx_ahb_freq - 1) / (2 * hz_max);
+ div = (rbspi->ahb_freq - 1) / (2 * hz_max);
/*
* CPU has a bug at (div == 0) - first bit read is random
@@ -365,7 +375,7 @@ static unsigned get_spi_ctrl(unsigned hz_max, const char *name)
++div;
if (name) {
- unsigned ahb_khz = (ar71xx_ahb_freq + 500) / 1000;
+ unsigned ahb_khz = (rbspi->ahb_freq + 500) / 1000;
unsigned div_real = 2 * (div + 1);
pr_debug("rb4xx: %s SPI clock %u kHz (AHB %u kHz / %u)\n",
name,
@@ -396,23 +406,40 @@ static int rb4xx_spi_probe(struct platform_device *pdev)
master->transfer = rb4xx_spi_transfer;
rbspi = spi_master_get_devdata(master);
+
+ rbspi->ahb_clk = clk_get(&pdev->dev, "ahb");
+ if (IS_ERR(rbspi->ahb_clk)) {
+ err = PTR_ERR(rbspi->ahb_clk);
+ goto err_put_master;
+ }
+
+ err = clk_enable(rbspi->ahb_clk);
+ if (err)
+ goto err_clk_put;
+
+ rbspi->ahb_freq = clk_get_rate(rbspi->ahb_clk);
+ if (!rbspi->ahb_freq) {
+ err = -EINVAL;
+ goto err_clk_disable;
+ }
+
platform_set_drvdata(pdev, rbspi);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
err = -ENOENT;
- goto err_put_master;
+ goto err_clk_disable;
}
rbspi->base = ioremap(r->start, r->end - r->start + 1);
if (!rbspi->base) {
err = -ENXIO;
- goto err_put_master;
+ goto err_clk_disable;
}
rbspi->master = master;
- rbspi->spi_ctrl_flash = get_spi_ctrl(SPI_FLASH_HZ, "FLASH");
- rbspi->spi_ctrl_fread = get_spi_ctrl(SPI_CPLD_HZ, "CPLD");
+ rbspi->spi_ctrl_flash = get_spi_ctrl(rbspi, SPI_FLASH_HZ, "FLASH");
+ rbspi->spi_ctrl_fread = get_spi_ctrl(rbspi, SPI_CPLD_HZ, "CPLD");
rbspi->cs_wait = -1;
spin_lock_init(&rbspi->lock);
@@ -428,6 +455,10 @@ static int rb4xx_spi_probe(struct platform_device *pdev)
err_iounmap:
iounmap(rbspi->base);
+err_clk_disable:
+ clk_disable(rbspi->ahb_clk);
+err_clk_put:
+ clk_put(rbspi->ahb_clk);
err_put_master:
platform_set_drvdata(pdev, NULL);
spi_master_put(master);
@@ -440,6 +471,8 @@ static int rb4xx_spi_remove(struct platform_device *pdev)
struct rb4xx_spi *rbspi = platform_get_drvdata(pdev);
iounmap(rbspi->base);
+ clk_disable(rbspi->ahb_clk);
+ clk_put(rbspi->ahb_clk);
platform_set_drvdata(pdev, NULL);
spi_master_put(rbspi->master);
generated by cgit v1.1 at 2024-11-06 01:26:28 +0000