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-rw-r--r--target/linux/ar71xx/patches-3.2/207-spi-ath79-make-chipselect-logic-more-flexible.patch165
1 files changed, 165 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches-3.2/207-spi-ath79-make-chipselect-logic-more-flexible.patch b/target/linux/ar71xx/patches-3.2/207-spi-ath79-make-chipselect-logic-more-flexible.patch
new file mode 100644
index 0000000000..7c45b73f1f
--- /dev/null
+++ b/target/linux/ar71xx/patches-3.2/207-spi-ath79-make-chipselect-logic-more-flexible.patch
@@ -0,0 +1,165 @@
+From b875f877d06acb852342636db4c3d1e6c9fe01ba Mon Sep 17 00:00:00 2001
+From: Gabor Juhos <juhosg@openwrt.org>
+Date: Wed, 11 Jan 2012 22:25:11 +0100
+Subject: [PATCH 7/7] spi/ath79: make chipselect logic more flexible
+
+Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
+---
+ .../include/asm/mach-ath79/ath79_spi_platform.h | 8 ++-
+ drivers/spi/spi-ath79.c | 65 +++++++++++--------
+ 2 files changed, 45 insertions(+), 28 deletions(-)
+
+--- 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
+@@ -30,6 +30,8 @@
+
+ #define DRV_NAME "ath79-spi"
+
++#define ATH79_SPI_CS_LINE_MAX 2
++
+ struct ath79_spi {
+ struct spi_bitbang bitbang;
+ u32 ioc_base;
+@@ -62,6 +64,7 @@ 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 */
+@@ -73,20 +76,21 @@ 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 */
++ gpio_set_value(cdata->cs_line, cs_high);
++ break;
++ }
+ }
+
+ static void ath79_spi_enable(struct ath79_spi *sp)
+@@ -114,24 +118,30 @@ static int ath79_spi_setup_cs(struct spi
+ {
+ struct ath79_spi *sp = ath79_spidev_to_sp(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_HIGH;
+ else
+ flags |= GPIOF_INIT_LOW;
+
+- status = gpio_request_one(cdata->gpio, flags,
++ status = gpio_request_one(cdata->cs_line, flags,
+ dev_name(&spi->dev));
++ break;
+ }
+
+ return status;
+@@ -139,11 +149,15 @@ static int ath79_spi_setup_cs(struct spi
+
+ static void ath79_spi_cleanup_cs(struct spi_device *spi)
+ {
+- struct ath79_spi *sp = ath79_spidev_to_sp(spi);
++ struct ath79_spi_controller_data *cdata = spi->controller_data;
+
+- if (spi->chip_select) {
+- struct ath79_spi_controller_data *cdata = spi->controller_data;
+- gpio_free(cdata->gpio);
++ 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;
+ }
+ }
+
+@@ -209,6 +223,10 @@ static __devinit int ath79_spi_probe(str
+ struct resource *r;
+ 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");
+@@ -218,17 +236,10 @@ static __devinit int ath79_spi_probe(str
+ sp = spi_master_get_devdata(master);
+ platform_set_drvdata(pdev, sp);
+
+- pdata = pdev->dev.platform_data;
+-
+ master->setup = ath79_spi_setup;
+ master->cleanup = ath79_spi_cleanup;
+- if (pdata) {
+- master->bus_num = pdata->bus_num;
+- master->num_chipselect = pdata->num_chipselect;
+- } else {
+- master->bus_num = -1;
+- master->num_chipselect = 1;
+- }
++ master->bus_num = pdata->bus_num;
++ master->num_chipselect = pdata->num_chipselect;
+
+ sp->bitbang.master = spi_master_get(master);
+ sp->bitbang.chipselect = ath79_spi_chipselect;