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From 7008284716403237f6bc7d7590b3ed073555bd56 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Wed, 11 Jan 2012 22:25:11 +0100
Subject: [PATCH 34/34] spi/ath79: make chipselect logic more flexible
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
arch/mips/ath79/mach-pb44.c | 6 ++
.../include/asm/mach-ath79/ath79_spi_platform.h | 8 ++-
drivers/spi/spi-ath79.c | 67 +++++++++++++-------
8 files changed, 88 insertions(+), 23 deletions(-)
--- a/arch/mips/ath79/mach-pb44.c
+++ b/arch/mips/ath79/mach-pb44.c
@@ -87,12 +87,18 @@ static struct gpio_keys_button pb44_gpio
}
};
+static struct ath79_spi_controller_data pb44_spi0_data = {
+ .cs_type = ATH79_SPI_CS_TYPE_INTERNAL,
+ .cs_line = 0,
+};
+
static struct spi_board_info pb44_spi_info[] = {
{
.bus_num = 0,
.chip_select = 0,
.max_speed_hz = 25000000,
.modalias = "m25p64",
+ .controller_data = &pb44_spi0_data,
},
};
--- a/arch/mips/include/asm/mach-ath79/ath79_spi_platform.h
+++ b/arch/mips/include/asm/mach-ath79/ath79_spi_platform.h
@@ -16,8 +16,14 @@ struct ath79_spi_platform_data {
unsigned num_chipselect;
};
+enum ath79_spi_cs_type {
+ ATH79_SPI_CS_TYPE_INTERNAL,
+ ATH79_SPI_CS_TYPE_GPIO,
+};
+
struct ath79_spi_controller_data {
- unsigned gpio;
+ enum ath79_spi_cs_type cs_type;
+ unsigned cs_line;
};
#endif /* _ATH79_SPI_PLATFORM_H */
--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -33,6 +33,8 @@
#define ATH79_SPI_RRW_DELAY_FACTOR 12000
#define MHZ (1000 * 1000)
+#define ATH79_SPI_CS_LINE_MAX 2
+
struct ath79_spi {
struct spi_bitbang bitbang;
u32 ioc_base;
@@ -67,6 +69,7 @@ static void ath79_spi_chipselect(struct
{
struct ath79_spi *sp = ath79_spidev_to_sp(spi);
int cs_high = (spi->mode & SPI_CS_HIGH) ? is_active : !is_active;
+ struct ath79_spi_controller_data *cdata = spi->controller_data;
if (is_active) {
/* set initial clock polarity */
@@ -78,20 +81,24 @@ static void ath79_spi_chipselect(struct
ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
}
- if (spi->chip_select) {
- struct ath79_spi_controller_data *cdata = spi->controller_data;
-
- /* SPI is normally active-low */
- gpio_set_value(cdata->gpio, cs_high);
- } else {
+ switch (cdata->cs_type) {
+ case ATH79_SPI_CS_TYPE_INTERNAL:
if (cs_high)
- sp->ioc_base |= AR71XX_SPI_IOC_CS0;
+ sp->ioc_base |= AR71XX_SPI_IOC_CS(cdata->cs_line);
else
- sp->ioc_base &= ~AR71XX_SPI_IOC_CS0;
+ sp->ioc_base &= ~AR71XX_SPI_IOC_CS(cdata->cs_line);
ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
- }
+ break;
+ case ATH79_SPI_CS_TYPE_GPIO:
+ /* SPI is normally active-low */
+ if (gpio_cansleep(cdata->cs_line))
+ gpio_set_value_cansleep(cdata->cs_line, cs_high);
+ else
+ gpio_set_value(cdata->cs_line, cs_high);
+ break;
+ }
}
static void ath79_spi_enable(struct ath79_spi *sp)
@@ -118,24 +125,30 @@ static void ath79_spi_disable(struct ath
static int ath79_spi_setup_cs(struct spi_device *spi)
{
struct ath79_spi_controller_data *cdata;
+ unsigned long flags;
int status;
cdata = spi->controller_data;
- if (spi->chip_select && !cdata)
+ if (!cdata)
return -EINVAL;
status = 0;
- if (spi->chip_select) {
- unsigned long flags;
+ switch (cdata->cs_type) {
+ case ATH79_SPI_CS_TYPE_INTERNAL:
+ if (cdata->cs_line > ATH79_SPI_CS_LINE_MAX)
+ status = -EINVAL;
+ break;
+ case ATH79_SPI_CS_TYPE_GPIO:
flags = GPIOF_DIR_OUT;
if (spi->mode & SPI_CS_HIGH)
flags |= GPIOF_INIT_LOW;
else
flags |= GPIOF_INIT_HIGH;
- status = gpio_request_one(cdata->gpio, flags,
+ status = gpio_request_one(cdata->cs_line, flags,
dev_name(&spi->dev));
+ break;
}
return status;
@@ -143,9 +156,19 @@ static int ath79_spi_setup_cs(struct spi
static void ath79_spi_cleanup_cs(struct spi_device *spi)
{
- if (spi->chip_select) {
- struct ath79_spi_controller_data *cdata = spi->controller_data;
- gpio_free(cdata->gpio);
+ struct ath79_spi_controller_data *cdata;
+
+ cdata = spi->controller_data;
+ if (!cdata)
+ return;
+
+ switch (cdata->cs_type) {
+ case ATH79_SPI_CS_TYPE_INTERNAL:
+ /* nothing to do */
+ break;
+ case ATH79_SPI_CS_TYPE_GPIO:
+ gpio_free(cdata->cs_line);
+ break;
}
}
@@ -210,6 +233,10 @@ static int ath79_spi_probe(struct platfo
unsigned long rate;
int ret;
+ pdata = pdev->dev.platform_data;
+ if (!pdata)
+ return -EINVAL;
+
master = spi_alloc_master(&pdev->dev, sizeof(*sp));
if (master == NULL) {
dev_err(&pdev->dev, "failed to allocate spi master\n");
@@ -219,15 +246,11 @@ static int ath79_spi_probe(struct platfo
sp = spi_master_get_devdata(master);
platform_set_drvdata(pdev, sp);
- pdata = dev_get_platdata(&pdev->dev);
-
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
master->setup = ath79_spi_setup;
master->cleanup = ath79_spi_cleanup;
- if (pdata) {
- master->bus_num = pdata->bus_num;
- master->num_chipselect = pdata->num_chipselect;
- }
+ master->bus_num = pdata->bus_num;
+ master->num_chipselect = pdata->num_chipselect;
sp->bitbang.master = master;
sp->bitbang.chipselect = ath79_spi_chipselect;
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