From: Gabor Juhos Date: Mon, 4 Mar 2013 09:40:44 +0000 (+0000) Subject: ar71xx: use backported SPI patches X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0ad50b0bec02ae964b722eb865d79e80439e066c;p=openwrt%2Fstaging%2Faparcar.git ar71xx: use backported SPI patches Signed-off-by: Gabor Juhos SVN-Revision: 35873 --- diff --git a/target/linux/ar71xx/patches-3.8/001-spi-ath79-add-delay-between-SCK-changes.patch b/target/linux/ar71xx/patches-3.8/001-spi-ath79-add-delay-between-SCK-changes.patch new file mode 100644 index 0000000000..9a1062287c --- /dev/null +++ b/target/linux/ar71xx/patches-3.8/001-spi-ath79-add-delay-between-SCK-changes.patch @@ -0,0 +1,126 @@ +From 486c150478777ef53cfef6f0d46840b9406b0612 Mon Sep 17 00:00:00 2001 +From: Gabor Juhos +Date: Thu, 27 Dec 2012 10:42:24 +0100 +Subject: [PATCH] spi/ath79: add delay between SCK changes + +commit 440114fdb13cbc53ea734bcc05b86bcf5b1e430c upstream. + +The driver uses the "as fast as it can" approach +to drive the SCK signal. However this does not +work with certain low speed SPI chips (e.g. the +PCF2123 RTC chip). + +The patch adds per-bit slowdowns in order to be +able to use the driver with such chips as well. + +Signed-off-by: Gabor Juhos +Signed-off-by: Grant Likely +--- + drivers/spi/spi-ath79.c | 44 +++++++++++++++++++++++++++++++++++++++++++- + 1 file changed, 43 insertions(+), 1 deletion(-) + +--- a/drivers/spi/spi-ath79.c ++++ b/drivers/spi/spi-ath79.c +@@ -24,17 +24,24 @@ + #include + #include + #include ++#include ++#include + + #include + #include + + #define DRV_NAME "ath79-spi" + ++#define ATH79_SPI_RRW_DELAY_FACTOR 12000 ++#define MHZ (1000 * 1000) ++ + struct ath79_spi { + struct spi_bitbang bitbang; + u32 ioc_base; + u32 reg_ctrl; + void __iomem *base; ++ struct clk *clk; ++ unsigned rrw_delay; + }; + + static inline u32 ath79_spi_rr(struct ath79_spi *sp, unsigned reg) +@@ -52,6 +59,12 @@ static inline struct ath79_spi *ath79_sp + return spi_master_get_devdata(spi->master); + } + ++static inline void ath79_spi_delay(struct ath79_spi *sp, unsigned nsecs) ++{ ++ if (nsecs > sp->rrw_delay) ++ ndelay(nsecs - sp->rrw_delay); ++} ++ + static void ath79_spi_chipselect(struct spi_device *spi, int is_active) + { + struct ath79_spi *sp = ath79_spidev_to_sp(spi); +@@ -184,7 +197,9 @@ static u32 ath79_spi_txrx_mode0(struct s + + /* setup MSB (to slave) on trailing edge */ + ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out); ++ ath79_spi_delay(sp, nsecs); + ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK); ++ ath79_spi_delay(sp, nsecs); + + word <<= 1; + } +@@ -198,6 +213,7 @@ static int ath79_spi_probe(struct platfo + struct ath79_spi *sp; + struct ath79_spi_platform_data *pdata; + struct resource *r; ++ unsigned long rate; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof(*sp)); +@@ -236,12 +252,36 @@ static int ath79_spi_probe(struct platfo + goto err_put_master; + } + ++ sp->clk = clk_get(&pdev->dev, "ahb"); ++ if (IS_ERR(sp->clk)) { ++ ret = PTR_ERR(sp->clk); ++ goto err_unmap; ++ } ++ ++ ret = clk_enable(sp->clk); ++ if (ret) ++ goto err_clk_put; ++ ++ rate = DIV_ROUND_UP(clk_get_rate(sp->clk), MHZ); ++ if (!rate) { ++ ret = -EINVAL; ++ goto err_clk_disable; ++ } ++ ++ sp->rrw_delay = ATH79_SPI_RRW_DELAY_FACTOR / rate; ++ dev_dbg(&pdev->dev, "register read/write delay is %u nsecs\n", ++ sp->rrw_delay); ++ + ret = spi_bitbang_start(&sp->bitbang); + if (ret) +- goto err_unmap; ++ goto err_clk_disable; + + return 0; + ++err_clk_disable: ++ clk_disable(sp->clk); ++err_clk_put: ++ clk_put(sp->clk); + err_unmap: + iounmap(sp->base); + err_put_master: +@@ -256,6 +296,8 @@ static int ath79_spi_remove(struct platf + struct ath79_spi *sp = platform_get_drvdata(pdev); + + spi_bitbang_stop(&sp->bitbang); ++ clk_disable(sp->clk); ++ clk_put(sp->clk); + iounmap(sp->base); + platform_set_drvdata(pdev, NULL); + spi_master_put(sp->bitbang.master); diff --git a/target/linux/ar71xx/patches-3.8/002-spi-ath79-add-missing-HIGH-LOW-SCK-transition.patch b/target/linux/ar71xx/patches-3.8/002-spi-ath79-add-missing-HIGH-LOW-SCK-transition.patch new file mode 100644 index 0000000000..393ffa5158 --- /dev/null +++ b/target/linux/ar71xx/patches-3.8/002-spi-ath79-add-missing-HIGH-LOW-SCK-transition.patch @@ -0,0 +1,31 @@ +From c7c943b1e3813ff5764ee6417a14530cb7cd6f57 Mon Sep 17 00:00:00 2001 +From: Gabor Juhos +Date: Thu, 27 Dec 2012 10:42:25 +0100 +Subject: [PATCH] spi/ath79: add missing HIGH->LOW SCK transition + +commit 72611db0eef21f4456d79ba302af4b34ea384f30 upstream. + +The 'ath79_spi_txrx_mode0' function does not +set the SCK signal to LOW at the end of a word +transfer. This causes communications errors with +certain devices (e.g. the PCF2123 RTC chip). + +The patch ensures that the SCK signal will be LOW. + +Signed-off-by: Gabor Juhos +Signed-off-by: Grant Likely +--- + drivers/spi/spi-ath79.c | 2 ++ + 1 file changed, 2 insertions(+) + +--- a/drivers/spi/spi-ath79.c ++++ b/drivers/spi/spi-ath79.c +@@ -200,6 +200,8 @@ static u32 ath79_spi_txrx_mode0(struct s + ath79_spi_delay(sp, nsecs); + ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK); + ath79_spi_delay(sp, nsecs); ++ if (bits == 1) ++ ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out); + + word <<= 1; + } diff --git a/target/linux/ar71xx/patches-3.8/003-spi-ath79-remove-superfluous-chip-select-code.patch b/target/linux/ar71xx/patches-3.8/003-spi-ath79-remove-superfluous-chip-select-code.patch new file mode 100644 index 0000000000..58272bdbf5 --- /dev/null +++ b/target/linux/ar71xx/patches-3.8/003-spi-ath79-remove-superfluous-chip-select-code.patch @@ -0,0 +1,33 @@ +From 622d87da7f99b29dde053881bf42c46de7572ce5 Mon Sep 17 00:00:00 2001 +From: Gabor Juhos +Date: Thu, 27 Dec 2012 10:42:26 +0100 +Subject: [PATCH] spi/ath79: remove superfluous chip select code + +commit f1e8fc9898fd8ca78b7438d3c2e60028d3ae2a34 upstream. + +The spi_bitbang driver calls the chipselect function +of the driver from spi_bitbang_setup in order to +deselect the given SPI chip, so we don't have to +initialize the CS line here. + +Signed-off-by: Gabor Juhos +Signed-off-by: Grant Likely +--- + drivers/spi/spi-ath79.c | 6 ------ + 1 file changed, 6 deletions(-) + +--- a/drivers/spi/spi-ath79.c ++++ b/drivers/spi/spi-ath79.c +@@ -128,12 +128,6 @@ static int ath79_spi_setup_cs(struct spi + gpio_free(cdata->gpio); + return status; + } +- } else { +- if (spi->mode & SPI_CS_HIGH) +- sp->ioc_base |= AR71XX_SPI_IOC_CS0; +- else +- sp->ioc_base &= ~AR71XX_SPI_IOC_CS0; +- ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base); + } + + return 0; diff --git a/target/linux/ar71xx/patches-3.8/004-spi-ath79-use-gpio_request_one.patch b/target/linux/ar71xx/patches-3.8/004-spi-ath79-use-gpio_request_one.patch new file mode 100644 index 0000000000..ee81ecd7fd --- /dev/null +++ b/target/linux/ar71xx/patches-3.8/004-spi-ath79-use-gpio_request_one.patch @@ -0,0 +1,59 @@ +From f0b166c931c9971f2ae9614881565d23f58b3178 Mon Sep 17 00:00:00 2001 +From: Gabor Juhos +Date: Thu, 27 Dec 2012 10:42:27 +0100 +Subject: [PATCH] spi/ath79: use gpio_request_one + +commit 95d79419feffb326a3d5cb50e2248129dec06bb0 upstream. + +Use gpio_request_one() instead of multiple gpiolib calls. + +Signed-off-by: Gabor Juhos +Signed-off-by: Grant Likely +--- + drivers/spi/spi-ath79.c | 22 +++++++++++----------- + 1 file changed, 11 insertions(+), 11 deletions(-) + +--- a/drivers/spi/spi-ath79.c ++++ b/drivers/spi/spi-ath79.c +@@ -100,6 +100,7 @@ static int ath79_spi_setup_cs(struct spi + { + struct ath79_spi *sp = ath79_spidev_to_sp(spi); + struct ath79_spi_controller_data *cdata; ++ int status; + + cdata = spi->controller_data; + if (spi->chip_select && !cdata) +@@ -115,22 +116,21 @@ static int ath79_spi_setup_cs(struct spi + /* TODO: setup speed? */ + ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43); + ++ status = 0; + if (spi->chip_select) { +- int status = 0; ++ unsigned long flags; + +- status = gpio_request(cdata->gpio, dev_name(&spi->dev)); +- if (status) +- return status; +- +- status = gpio_direction_output(cdata->gpio, +- spi->mode & SPI_CS_HIGH); +- if (status) { +- gpio_free(cdata->gpio); +- return status; +- } ++ 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, ++ dev_name(&spi->dev)); + } + +- return 0; ++ return status; + } + + static void ath79_spi_cleanup_cs(struct spi_device *spi) diff --git a/target/linux/ar71xx/patches-3.8/005-spi-ath79-avoid-multiple-initialization-of-the-SPI-c.patch b/target/linux/ar71xx/patches-3.8/005-spi-ath79-avoid-multiple-initialization-of-the-SPI-c.patch new file mode 100644 index 0000000000..8ad1dc3a93 --- /dev/null +++ b/target/linux/ar71xx/patches-3.8/005-spi-ath79-avoid-multiple-initialization-of-the-SPI-c.patch @@ -0,0 +1,112 @@ +From d731c08cf1d264fd6113b9a97790c5a3a86ea520 Mon Sep 17 00:00:00 2001 +From: Gabor Juhos +Date: Thu, 27 Dec 2012 10:42:28 +0100 +Subject: [PATCH] spi/ath79: avoid multiple initialization of the SPI + controller + +commit c4a31f43005512b366e8bfc346e7f14c1a7a1ba7 upstream. + +Currently we are initializing the SPI controller in +the chip select line function, and that function is +called once for each SPI device on the bus. If a +board has multiple SPI devices, the controller will +be initialized multiple times. + +Introduce ath79_spi_{en,dis}able helper functions, +and call those from probe/response in order to avoid +the mutliple initialization of the controller. + +Signed-off-by: Gabor Juhos +Signed-off-by: Grant Likely +--- + drivers/spi/spi-ath79.c | 41 ++++++++++++++++++++++++----------------- + 1 file changed, 24 insertions(+), 17 deletions(-) + +--- a/drivers/spi/spi-ath79.c ++++ b/drivers/spi/spi-ath79.c +@@ -96,16 +96,8 @@ static void ath79_spi_chipselect(struct + + } + +-static int ath79_spi_setup_cs(struct spi_device *spi) ++static void ath79_spi_enable(struct ath79_spi *sp) + { +- struct ath79_spi *sp = ath79_spidev_to_sp(spi); +- struct ath79_spi_controller_data *cdata; +- int status; +- +- cdata = spi->controller_data; +- if (spi->chip_select && !cdata) +- return -EINVAL; +- + /* enable GPIO mode */ + ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO); + +@@ -115,6 +107,24 @@ static int ath79_spi_setup_cs(struct spi + + /* TODO: setup speed? */ + ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43); ++} ++ ++static void ath79_spi_disable(struct ath79_spi *sp) ++{ ++ /* restore CTRL register */ ++ ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl); ++ /* disable GPIO mode */ ++ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0); ++} ++ ++static int ath79_spi_setup_cs(struct spi_device *spi) ++{ ++ struct ath79_spi_controller_data *cdata; ++ int status; ++ ++ cdata = spi->controller_data; ++ if (spi->chip_select && !cdata) ++ return -EINVAL; + + status = 0; + if (spi->chip_select) { +@@ -135,17 +145,10 @@ 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); +- + if (spi->chip_select) { + struct ath79_spi_controller_data *cdata = spi->controller_data; + gpio_free(cdata->gpio); + } +- +- /* restore CTRL register */ +- ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl); +- /* disable GPIO mode */ +- ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0); + } + + static int ath79_spi_setup(struct spi_device *spi) +@@ -268,12 +271,15 @@ static int ath79_spi_probe(struct platfo + dev_dbg(&pdev->dev, "register read/write delay is %u nsecs\n", + sp->rrw_delay); + ++ ath79_spi_enable(sp); + ret = spi_bitbang_start(&sp->bitbang); + if (ret) +- goto err_clk_disable; ++ goto err_disable; + + return 0; + ++err_disable: ++ ath79_spi_disable(sp); + err_clk_disable: + clk_disable(sp->clk); + err_clk_put: +@@ -292,6 +298,7 @@ static int ath79_spi_remove(struct platf + struct ath79_spi *sp = platform_get_drvdata(pdev); + + spi_bitbang_stop(&sp->bitbang); ++ ath79_spi_disable(sp); + clk_disable(sp->clk); + clk_put(sp->clk); + iounmap(sp->base); diff --git a/target/linux/ar71xx/patches-3.8/006-spi-ath79-add-shutdown-handler.patch b/target/linux/ar71xx/patches-3.8/006-spi-ath79-add-shutdown-handler.patch new file mode 100644 index 0000000000..6f59884374 --- /dev/null +++ b/target/linux/ar71xx/patches-3.8/006-spi-ath79-add-shutdown-handler.patch @@ -0,0 +1,54 @@ +From a32b0e7851320cba0144d20e87e5326ee81e1063 Mon Sep 17 00:00:00 2001 +From: Gabor Juhos +Date: Tue, 5 Feb 2013 20:57:55 +0100 +Subject: [PATCH] spi/ath79: add shutdown handler + +commit 7410e848583f9120dd5f9414629f01bb76b5ee5f upstream. + +The SPI controller of the AR7xxx/AR9xxx SoCs +have a special mode which allows the SoC to +directly read data from SPI flash chips. In +this mode, the content of the SPI flash chip +can be accessed via a memory mapped region. + +During early init time, the kernel expects +that the flash chip is accessible through +that memory region because it reads board +specific values (e.g. MAC address, WiFi +calibration data) from the flash on various +boards. + +This is working if the kernel is loaded +directly by the bootloader because that +leaves the SPI controller in the special +mode. However it is not working in a kexec'd +kernel because the SPI driver does not restore +the special mode during shutdown. + +The patch adds a shutdown handler to fix this +issue. + +Signed-off-by: Gabor Juhos +Signed-off-by: Grant Likely +--- + drivers/spi/spi-ath79.c | 6 ++++++ + 1 file changed, 6 insertions(+) + +--- a/drivers/spi/spi-ath79.c ++++ b/drivers/spi/spi-ath79.c +@@ -308,9 +308,15 @@ static int ath79_spi_remove(struct platf + return 0; + } + ++static void ath79_spi_shutdown(struct platform_device *pdev) ++{ ++ ath79_spi_remove(pdev); ++} ++ + static struct platform_driver ath79_spi_driver = { + .probe = ath79_spi_probe, + .remove = ath79_spi_remove, ++ .shutdown = ath79_spi_shutdown, + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, diff --git a/target/linux/ar71xx/patches-3.8/200-spi-ath79-add-delay-between-SCK-changes.patch b/target/linux/ar71xx/patches-3.8/200-spi-ath79-add-delay-between-SCK-changes.patch deleted file mode 100644 index 7db744acf6..0000000000 --- a/target/linux/ar71xx/patches-3.8/200-spi-ath79-add-delay-between-SCK-changes.patch +++ /dev/null @@ -1,122 +0,0 @@ -From cbb3ade4765bc715b5c2eae4a7b6eaf3ff7ad958 Mon Sep 17 00:00:00 2001 -From: Gabor Juhos -Date: Wed, 11 Jan 2012 20:06:35 +0100 -Subject: [PATCH 28/34] spi/ath79: add delay between SCK changes - -The driver uses the "as fast as it can" approach -to drive the SCK signal. However this does not -work with certain low speed SPI chips (e.g. the -PCF2123 RTC chip). Add per-bit slowdowns in order -to be able to use the driver with such chips as -well. - -Signed-off-by: Gabor Juhos ---- - drivers/spi/spi-ath79.c | 44 +++++++++++++++++++++++++++++++++++++++++++- - 1 files changed, 43 insertions(+), 1 deletions(-) - ---- a/drivers/spi/spi-ath79.c -+++ b/drivers/spi/spi-ath79.c -@@ -24,17 +24,24 @@ - #include - #include - #include -+#include -+#include - - #include - #include - - #define DRV_NAME "ath79-spi" - -+#define ATH79_SPI_RRW_DELAY_FACTOR 12000 -+#define MHZ (1000 * 1000) -+ - struct ath79_spi { - struct spi_bitbang bitbang; - u32 ioc_base; - u32 reg_ctrl; - void __iomem *base; -+ struct clk *clk; -+ unsigned rrw_delay; - }; - - static inline u32 ath79_spi_rr(struct ath79_spi *sp, unsigned reg) -@@ -52,6 +59,12 @@ static inline struct ath79_spi *ath79_sp - return spi_master_get_devdata(spi->master); - } - -+static inline void ath79_spi_delay(struct ath79_spi *sp, unsigned nsecs) -+{ -+ if (nsecs > sp->rrw_delay) -+ ndelay(nsecs - sp->rrw_delay); -+} -+ - static void ath79_spi_chipselect(struct spi_device *spi, int is_active) - { - struct ath79_spi *sp = ath79_spidev_to_sp(spi); -@@ -184,7 +197,9 @@ static u32 ath79_spi_txrx_mode0(struct s - - /* setup MSB (to slave) on trailing edge */ - ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out); -+ ath79_spi_delay(sp, nsecs); - ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK); -+ ath79_spi_delay(sp, nsecs); - - word <<= 1; - } -@@ -198,6 +213,7 @@ static int ath79_spi_probe(struct platfo - struct ath79_spi *sp; - struct ath79_spi_platform_data *pdata; - struct resource *r; -+ unsigned long rate; - int ret; - - master = spi_alloc_master(&pdev->dev, sizeof(*sp)); -@@ -236,12 +252,36 @@ static int ath79_spi_probe(struct platfo - goto err_put_master; - } - -+ sp->clk = clk_get(&pdev->dev, "ahb"); -+ if (IS_ERR(sp->clk)) { -+ ret = PTR_ERR(sp->clk); -+ goto err_unmap; -+ } -+ -+ ret = clk_enable(sp->clk); -+ if (ret) -+ goto err_clk_put; -+ -+ rate = DIV_ROUND_UP(clk_get_rate(sp->clk), MHZ); -+ if (!rate) { -+ ret = -EINVAL; -+ goto err_clk_disable; -+ } -+ -+ sp->rrw_delay = ATH79_SPI_RRW_DELAY_FACTOR / rate; -+ dev_dbg(&pdev->dev, "register read/write delay is %u nsecs\n", -+ sp->rrw_delay); -+ - ret = spi_bitbang_start(&sp->bitbang); - if (ret) -- goto err_unmap; -+ goto err_clk_disable; - - return 0; - -+err_clk_disable: -+ clk_disable(sp->clk); -+err_clk_put: -+ clk_put(sp->clk); - err_unmap: - iounmap(sp->base); - err_put_master: -@@ -256,6 +296,8 @@ static int ath79_spi_remove(struct platf - struct ath79_spi *sp = platform_get_drvdata(pdev); - - spi_bitbang_stop(&sp->bitbang); -+ clk_disable(sp->clk); -+ clk_put(sp->clk); - iounmap(sp->base); - platform_set_drvdata(pdev, NULL); - spi_master_put(sp->bitbang.master); diff --git a/target/linux/ar71xx/patches-3.8/201-spi-ath79-add-missing-HIGH-LOW-SCK-transition.patch b/target/linux/ar71xx/patches-3.8/201-spi-ath79-add-missing-HIGH-LOW-SCK-transition.patch deleted file mode 100644 index fd3d9689a2..0000000000 --- a/target/linux/ar71xx/patches-3.8/201-spi-ath79-add-missing-HIGH-LOW-SCK-transition.patch +++ /dev/null @@ -1,21 +0,0 @@ -From bcb0fdebc08f828b54d0a2eb74a9d1378701a8e0 Mon Sep 17 00:00:00 2001 -From: Gabor Juhos -Date: Wed, 11 Jan 2012 20:33:41 +0100 -Subject: [PATCH 29/34] spi/ath79: add missing HIGH->LOW SCK transition - -Signed-off-by: Gabor Juhos ---- - drivers/spi/spi-ath79.c | 2 ++ - 1 files changed, 2 insertions(+), 0 deletions(-) - ---- a/drivers/spi/spi-ath79.c -+++ b/drivers/spi/spi-ath79.c -@@ -200,6 +200,8 @@ static u32 ath79_spi_txrx_mode0(struct s - ath79_spi_delay(sp, nsecs); - ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK); - ath79_spi_delay(sp, nsecs); -+ if (bits == 1) -+ ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out); - - word <<= 1; - } diff --git a/target/linux/ar71xx/patches-3.8/202-spi-ath79-remove-superfluous-chip-select-code.patch b/target/linux/ar71xx/patches-3.8/202-spi-ath79-remove-superfluous-chip-select-code.patch deleted file mode 100644 index eec3293d9e..0000000000 --- a/target/linux/ar71xx/patches-3.8/202-spi-ath79-remove-superfluous-chip-select-code.patch +++ /dev/null @@ -1,30 +0,0 @@ -From 06752f9b169493cd1323f8337c147ad2dd31025c Mon Sep 17 00:00:00 2001 -From: Gabor Juhos -Date: Mon, 9 Jan 2012 15:03:28 +0100 -Subject: [PATCH 30/34] spi/ath79: remove superfluous chip select code - -The spi_bitbang driver calls the chipselect function -of the driver from spi_bitbang_setup in order to -deselect the given SPI chip, so we don't have to -initialize the CS line here. - -Signed-off-by: Gabor Juhos ---- - drivers/spi/spi-ath79.c | 6 ------ - 1 files changed, 0 insertions(+), 6 deletions(-) - ---- a/drivers/spi/spi-ath79.c -+++ b/drivers/spi/spi-ath79.c -@@ -128,12 +128,6 @@ static int ath79_spi_setup_cs(struct spi - gpio_free(cdata->gpio); - return status; - } -- } else { -- if (spi->mode & SPI_CS_HIGH) -- sp->ioc_base |= AR71XX_SPI_IOC_CS0; -- else -- sp->ioc_base &= ~AR71XX_SPI_IOC_CS0; -- ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base); - } - - return 0; diff --git a/target/linux/ar71xx/patches-3.8/203-spi-ath79-use-gpio_request_one.patch b/target/linux/ar71xx/patches-3.8/203-spi-ath79-use-gpio_request_one.patch deleted file mode 100644 index 12559bcae1..0000000000 --- a/target/linux/ar71xx/patches-3.8/203-spi-ath79-use-gpio_request_one.patch +++ /dev/null @@ -1,56 +0,0 @@ -From 6bd876a46b977643f27d2cc63f49e1bc84b78134 Mon Sep 17 00:00:00 2001 -From: Gabor Juhos -Date: Mon, 9 Jan 2012 15:04:21 +0100 -Subject: [PATCH 31/34] spi/ath79: use gpio_request_one - -Use gpio_request_one() instead of multiple gpiolib calls. - -Signed-off-by: Gabor Juhos ---- - drivers/spi/spi-ath79.c | 26 +++++++++++++------------- - 1 files changed, 13 insertions(+), 13 deletions(-) - ---- a/drivers/spi/spi-ath79.c -+++ b/drivers/spi/spi-ath79.c -@@ -100,6 +100,7 @@ static int ath79_spi_setup_cs(struct spi - { - struct ath79_spi *sp = ath79_spidev_to_sp(spi); - struct ath79_spi_controller_data *cdata; -+ int status; - - cdata = spi->controller_data; - if (spi->chip_select && !cdata) -@@ -115,22 +116,21 @@ static int ath79_spi_setup_cs(struct spi - /* TODO: setup speed? */ - ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43); - -+ status = 0; - if (spi->chip_select) { -- int status = 0; -+ unsigned long flags; - -- status = gpio_request(cdata->gpio, dev_name(&spi->dev)); -- if (status) -- return status; -- -- status = gpio_direction_output(cdata->gpio, -- spi->mode & SPI_CS_HIGH); -- if (status) { -- gpio_free(cdata->gpio); -- return status; -- } -+ 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, -+ dev_name(&spi->dev)); - } - -- return 0; -+ return status; - } - - static void ath79_spi_cleanup_cs(struct spi_device *spi) diff --git a/target/linux/ar71xx/patches-3.8/204-spi-ath79-avoid-multiple-initialization-of-the-SPI-c.patch b/target/linux/ar71xx/patches-3.8/204-spi-ath79-avoid-multiple-initialization-of-the-SPI-c.patch deleted file mode 100644 index e69b9b3958..0000000000 --- a/target/linux/ar71xx/patches-3.8/204-spi-ath79-avoid-multiple-initialization-of-the-SPI-c.patch +++ /dev/null @@ -1,108 +0,0 @@ -From e63ceaa0c4f7be0498cd452981073d3ce8e7d1f5 Mon Sep 17 00:00:00 2001 -From: Gabor Juhos -Date: Mon, 9 Jan 2012 15:00:46 +0100 -Subject: [PATCH 32/34] spi/ath79: avoid multiple initialization of the SPI controller - -Currently we are initializing the SPI controller in -the chip select line function, and that function is -called once for each SPI device on the bus. If a -board has multiple SPI devices, the controller will -be initialized multiple times. - -Introduce ath79_spi_{en,dis}able helper functions, -and call those from probe/response in order to avoid -the mutliple initialization of the controller. - -Signed-off-by: Gabor Juhos ---- - drivers/spi/spi-ath79.c | 41 ++++++++++++++++++++++++----------------- - 1 files changed, 24 insertions(+), 17 deletions(-) - ---- a/drivers/spi/spi-ath79.c -+++ b/drivers/spi/spi-ath79.c -@@ -96,16 +96,8 @@ static void ath79_spi_chipselect(struct - - } - --static int ath79_spi_setup_cs(struct spi_device *spi) -+static void ath79_spi_enable(struct ath79_spi *sp) - { -- struct ath79_spi *sp = ath79_spidev_to_sp(spi); -- struct ath79_spi_controller_data *cdata; -- int status; -- -- cdata = spi->controller_data; -- if (spi->chip_select && !cdata) -- return -EINVAL; -- - /* enable GPIO mode */ - ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO); - -@@ -115,6 +107,24 @@ static int ath79_spi_setup_cs(struct spi - - /* TODO: setup speed? */ - ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43); -+} -+ -+static void ath79_spi_disable(struct ath79_spi *sp) -+{ -+ /* restore CTRL register */ -+ ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl); -+ /* disable GPIO mode */ -+ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0); -+} -+ -+static int ath79_spi_setup_cs(struct spi_device *spi) -+{ -+ struct ath79_spi_controller_data *cdata; -+ int status; -+ -+ cdata = spi->controller_data; -+ if (spi->chip_select && !cdata) -+ return -EINVAL; - - status = 0; - if (spi->chip_select) { -@@ -135,17 +145,10 @@ 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); -- - if (spi->chip_select) { - struct ath79_spi_controller_data *cdata = spi->controller_data; - gpio_free(cdata->gpio); - } -- -- /* restore CTRL register */ -- ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl); -- /* disable GPIO mode */ -- ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0); - } - - static int ath79_spi_setup(struct spi_device *spi) -@@ -268,12 +271,15 @@ static int ath79_spi_probe(struct platfo - dev_dbg(&pdev->dev, "register read/write delay is %u nsecs\n", - sp->rrw_delay); - -+ ath79_spi_enable(sp); - ret = spi_bitbang_start(&sp->bitbang); - if (ret) -- goto err_clk_disable; -+ goto err_disable; - - return 0; - -+err_disable: -+ ath79_spi_disable(sp); - err_clk_disable: - clk_disable(sp->clk); - err_clk_put: -@@ -292,6 +298,7 @@ static int ath79_spi_remove(struct platf - struct ath79_spi *sp = platform_get_drvdata(pdev); - - spi_bitbang_stop(&sp->bitbang); -+ ath79_spi_disable(sp); - clk_disable(sp->clk); - clk_put(sp->clk); - iounmap(sp->base); diff --git a/target/linux/ar71xx/patches-3.8/205-spi-ath79-add-shutdown-handler.patch b/target/linux/ar71xx/patches-3.8/205-spi-ath79-add-shutdown-handler.patch deleted file mode 100644 index fc54923bbe..0000000000 --- a/target/linux/ar71xx/patches-3.8/205-spi-ath79-add-shutdown-handler.patch +++ /dev/null @@ -1,28 +0,0 @@ -From dab305def68a9ea28c1c0ca2fc20bba645944914 Mon Sep 17 00:00:00 2001 -From: Gabor Juhos -Date: Wed, 11 Jan 2012 22:19:32 +0100 -Subject: [PATCH 33/34] spi/ath79: add shutdown handler - -Signed-off-by: Gabor Juhos ---- - drivers/spi/spi-ath79.c | 12 +++++++++++- - 1 files changed, 11 insertions(+), 1 deletions(-) - ---- a/drivers/spi/spi-ath79.c -+++ b/drivers/spi/spi-ath79.c -@@ -308,9 +308,15 @@ static int ath79_spi_remove(struct platf - return 0; - } - -+static void ath79_spi_shutdown(struct platform_device *pdev) -+{ -+ ath79_spi_remove(pdev); -+} -+ - static struct platform_driver ath79_spi_driver = { - .probe = ath79_spi_probe, - .remove = ath79_spi_remove, -+ .shutdown = ath79_spi_shutdown, - .driver = { - .name = DRV_NAME, - .owner = THIS_MODULE,