diff options
Diffstat (limited to 'target/linux/ar71xx/patches-3.3/207-spi-ath79-make-chipselect-logic-more-flexible.patch')
| -rw-r--r-- | target/linux/ar71xx/patches-3.3/207-spi-ath79-make-chipselect-logic-more-flexible.patch | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches-3.3/207-spi-ath79-make-chipselect-logic-more-flexible.patch b/target/linux/ar71xx/patches-3.3/207-spi-ath79-make-chipselect-logic-more-flexible.patch new file mode 100644 index 000000000..af96f5573 --- /dev/null +++ b/target/linux/ar71xx/patches-3.3/207-spi-ath79-make-chipselect-logic-more-flexible.patch @@ -0,0 +1,164 @@ +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) +@@ -113,24 +117,30 @@ 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_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; +@@ -138,9 +148,15 @@ 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 = spi->controller_data; ++ ++ 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; + } + } + +@@ -206,6 +222,10 @@ 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"); +@@ -215,17 +235,10 @@ 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; |