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path: root/drivers/spi/spi-ath79.c
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Diffstat (limited to 'drivers/spi/spi-ath79.c')
-rw-r--r--drivers/spi/spi-ath79.c114
1 files changed, 24 insertions, 90 deletions
diff --git a/drivers/spi/spi-ath79.c b/drivers/spi/spi-ath79.c
index 3f6b657394de..847f354ebef1 100644
--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -21,18 +21,26 @@
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/bitops.h>
-#include <linux/gpio.h>
#include <linux/clk.h>
#include <linux/err.h>
-
-#include <asm/mach-ath79/ar71xx_regs.h>
-#include <asm/mach-ath79/ath79_spi_platform.h>
+#include <linux/platform_data/spi-ath79.h>
#define DRV_NAME "ath79-spi"
#define ATH79_SPI_RRW_DELAY_FACTOR 12000
#define MHZ (1000 * 1000)
+#define AR71XX_SPI_REG_FS 0x00 /* Function Select */
+#define AR71XX_SPI_REG_CTRL 0x04 /* SPI Control */
+#define AR71XX_SPI_REG_IOC 0x08 /* SPI I/O Control */
+#define AR71XX_SPI_REG_RDS 0x0c /* Read Data Shift */
+
+#define AR71XX_SPI_FS_GPIO BIT(0) /* Enable GPIO mode */
+
+#define AR71XX_SPI_IOC_DO BIT(0) /* Data Out pin */
+#define AR71XX_SPI_IOC_CLK BIT(8) /* CLK pin */
+#define AR71XX_SPI_IOC_CS(n) BIT(16 + (n))
+
struct ath79_spi {
struct spi_bitbang bitbang;
u32 ioc_base;
@@ -67,31 +75,14 @@ static void ath79_spi_chipselect(struct spi_device *spi, int is_active)
{
struct ath79_spi *sp = ath79_spidev_to_sp(spi);
int cs_high = (spi->mode & SPI_CS_HIGH) ? is_active : !is_active;
+ u32 cs_bit = AR71XX_SPI_IOC_CS(spi->chip_select);
- if (is_active) {
- /* set initial clock polarity */
- if (spi->mode & SPI_CPOL)
- sp->ioc_base |= AR71XX_SPI_IOC_CLK;
- else
- sp->ioc_base &= ~AR71XX_SPI_IOC_CLK;
-
- ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
- }
-
- if (gpio_is_valid(spi->cs_gpio)) {
- /* SPI is normally active-low */
- gpio_set_value_cansleep(spi->cs_gpio, cs_high);
- } else {
- u32 cs_bit = AR71XX_SPI_IOC_CS(spi->chip_select);
-
- if (cs_high)
- sp->ioc_base |= cs_bit;
- else
- sp->ioc_base &= ~cs_bit;
-
- ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
- }
+ if (cs_high)
+ sp->ioc_base |= cs_bit;
+ else
+ sp->ioc_base &= ~cs_bit;
+ ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
}
static void ath79_spi_enable(struct ath79_spi *sp)
@@ -103,6 +94,9 @@ static void ath79_spi_enable(struct ath79_spi *sp)
sp->reg_ctrl = ath79_spi_rr(sp, AR71XX_SPI_REG_CTRL);
sp->ioc_base = ath79_spi_rr(sp, AR71XX_SPI_REG_IOC);
+ /* clear clk and mosi in the base state */
+ sp->ioc_base &= ~(AR71XX_SPI_IOC_DO | AR71XX_SPI_IOC_CLK);
+
/* TODO: setup speed? */
ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);
}
@@ -115,66 +109,6 @@ static void ath79_spi_disable(struct ath79_spi *sp)
ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
}
-static int ath79_spi_setup_cs(struct spi_device *spi)
-{
- struct ath79_spi *sp = ath79_spidev_to_sp(spi);
- int status;
-
- status = 0;
- if (gpio_is_valid(spi->cs_gpio)) {
- unsigned long flags;
-
- flags = GPIOF_DIR_OUT;
- if (spi->mode & SPI_CS_HIGH)
- flags |= GPIOF_INIT_LOW;
- else
- flags |= GPIOF_INIT_HIGH;
-
- status = gpio_request_one(spi->cs_gpio, flags,
- dev_name(&spi->dev));
- } else {
- u32 cs_bit = AR71XX_SPI_IOC_CS(spi->chip_select);
-
- if (spi->mode & SPI_CS_HIGH)
- sp->ioc_base &= ~cs_bit;
- else
- sp->ioc_base |= cs_bit;
-
- ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
- }
-
- return status;
-}
-
-static void ath79_spi_cleanup_cs(struct spi_device *spi)
-{
- if (gpio_is_valid(spi->cs_gpio))
- gpio_free(spi->cs_gpio);
-}
-
-static int ath79_spi_setup(struct spi_device *spi)
-{
- int status = 0;
-
- if (!spi->controller_state) {
- status = ath79_spi_setup_cs(spi);
- if (status)
- return status;
- }
-
- status = spi_bitbang_setup(spi);
- if (status && !spi->controller_state)
- ath79_spi_cleanup_cs(spi);
-
- return status;
-}
-
-static void ath79_spi_cleanup(struct spi_device *spi)
-{
- ath79_spi_cleanup_cs(spi);
- spi_bitbang_cleanup(spi);
-}
-
static u32 ath79_spi_txrx_mode0(struct spi_device *spi, unsigned int nsecs,
u32 word, u8 bits, unsigned flags)
{
@@ -225,9 +159,10 @@ static int ath79_spi_probe(struct platform_device *pdev)
pdata = dev_get_platdata(&pdev->dev);
+ master->use_gpio_descriptors = true;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
- master->setup = ath79_spi_setup;
- master->cleanup = ath79_spi_cleanup;
+ master->setup = spi_bitbang_setup;
+ master->cleanup = spi_bitbang_cleanup;
if (pdata) {
master->bus_num = pdata->bus_num;
master->num_chipselect = pdata->num_chipselect;
@@ -236,7 +171,6 @@ static int ath79_spi_probe(struct platform_device *pdev)
sp->bitbang.master = master;
sp->bitbang.chipselect = ath79_spi_chipselect;
sp->bitbang.txrx_word[SPI_MODE_0] = ath79_spi_txrx_mode0;
- sp->bitbang.setup_transfer = spi_bitbang_setup_transfer;
sp->bitbang.flags = SPI_CS_HIGH;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);