summaryrefslogtreecommitdiffstats
path: root/target/linux/brcm63xx/patches-2.6.35/121-spi-gpio-norxtx-support.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm63xx/patches-2.6.35/121-spi-gpio-norxtx-support.patch')
-rw-r--r--target/linux/brcm63xx/patches-2.6.35/121-spi-gpio-norxtx-support.patch217
1 files changed, 0 insertions, 217 deletions
diff --git a/target/linux/brcm63xx/patches-2.6.35/121-spi-gpio-norxtx-support.patch b/target/linux/brcm63xx/patches-2.6.35/121-spi-gpio-norxtx-support.patch
deleted file mode 100644
index 7ecf39fb0..000000000
--- a/target/linux/brcm63xx/patches-2.6.35/121-spi-gpio-norxtx-support.patch
+++ /dev/null
@@ -1,217 +0,0 @@
-From 3c8e1a84fd6b984a7bce8816db2e3defc57bbfe4 Mon Sep 17 00:00:00 2001
-From: Marek Szyprowski <m.szyprowski@samsung.com>
-Date: Wed, 30 Jun 2010 14:27:37 -0600
-Subject: [PATCH] spi/spi-gpio: add support for controllers without MISO or MOSI pin
-
-There are some boards that do not strictly follow SPI standard and use
-only 3 wires (SCLK, MOSI or MISO, SS) for connecting some simple auxiliary
-chips and controls them with GPIO based 'spi controller'. In this
-configuration the MISO or MOSI line is missing (it is not required if the
-chip does not transfer any data back to host or host only reads data from
-chip).
-
-This patch adds support for such non-standard configuration in GPIO-based
-SPI controller. It has been tested in configuration without MISO pin.
-
-Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>
-Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
-Acked-by: David Brownell <dbrownell@users.sourceforge.net>
-Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
----
- drivers/spi/spi_gpio.c | 101 ++++++++++++++++++++++++++++++++++-------
- include/linux/spi/spi_gpio.h | 5 ++
- 2 files changed, 88 insertions(+), 18 deletions(-)
-
---- a/drivers/spi/spi_gpio.c
-+++ b/drivers/spi/spi_gpio.c
-@@ -178,6 +178,44 @@ static u32 spi_gpio_txrx_word_mode3(stru
- return bitbang_txrx_be_cpha1(spi, nsecs, 1, 0, word, bits);
- }
-
-+/*
-+ * These functions do not call setmosi or getmiso if respective flag
-+ * (SPI_MASTER_NO_RX or SPI_MASTER_NO_TX) is set, so they are safe to
-+ * call when such pin is not present or defined in the controller.
-+ * A separate set of callbacks is defined to get highest possible
-+ * speed in the generic case (when both MISO and MOSI lines are
-+ * available), as optimiser will remove the checks when argument is
-+ * constant.
-+ */
-+
-+static u32 spi_gpio_spec_txrx_word_mode0(struct spi_device *spi,
-+ unsigned nsecs, u32 word, u8 bits)
-+{
-+ unsigned flags = spi->master->flags;
-+ return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits);
-+}
-+
-+static u32 spi_gpio_spec_txrx_word_mode1(struct spi_device *spi,
-+ unsigned nsecs, u32 word, u8 bits)
-+{
-+ unsigned flags = spi->master->flags;
-+ return bitbang_txrx_be_cpha1(spi, nsecs, 0, flags, word, bits);
-+}
-+
-+static u32 spi_gpio_spec_txrx_word_mode2(struct spi_device *spi,
-+ unsigned nsecs, u32 word, u8 bits)
-+{
-+ unsigned flags = spi->master->flags;
-+ return bitbang_txrx_be_cpha0(spi, nsecs, 1, flags, word, bits);
-+}
-+
-+static u32 spi_gpio_spec_txrx_word_mode3(struct spi_device *spi,
-+ unsigned nsecs, u32 word, u8 bits)
-+{
-+ unsigned flags = spi->master->flags;
-+ return bitbang_txrx_be_cpha1(spi, nsecs, 1, flags, word, bits);
-+}
-+
- /*----------------------------------------------------------------------*/
-
- static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
-@@ -243,19 +281,30 @@ static int __devinit spi_gpio_alloc(unsi
- }
-
- static int __devinit
--spi_gpio_request(struct spi_gpio_platform_data *pdata, const char *label)
-+spi_gpio_request(struct spi_gpio_platform_data *pdata, const char *label,
-+ u16 *res_flags)
- {
- int value;
-
- /* NOTE: SPI_*_GPIO symbols may reference "pdata" */
-
-- value = spi_gpio_alloc(SPI_MOSI_GPIO, label, false);
-- if (value)
-- goto done;
--
-- value = spi_gpio_alloc(SPI_MISO_GPIO, label, true);
-- if (value)
-- goto free_mosi;
-+ if (SPI_MOSI_GPIO != SPI_GPIO_NO_MOSI) {
-+ value = spi_gpio_alloc(SPI_MOSI_GPIO, label, false);
-+ if (value)
-+ goto done;
-+ } else {
-+ /* HW configuration without MOSI pin */
-+ *res_flags |= SPI_MASTER_NO_TX;
-+ }
-+
-+ if (SPI_MISO_GPIO != SPI_GPIO_NO_MISO) {
-+ value = spi_gpio_alloc(SPI_MISO_GPIO, label, true);
-+ if (value)
-+ goto free_mosi;
-+ } else {
-+ /* HW configuration without MISO pin */
-+ *res_flags |= SPI_MASTER_NO_RX;
-+ }
-
- value = spi_gpio_alloc(SPI_SCK_GPIO, label, false);
- if (value)
-@@ -264,9 +313,11 @@ spi_gpio_request(struct spi_gpio_platfor
- goto done;
-
- free_miso:
-- gpio_free(SPI_MISO_GPIO);
-+ if (SPI_MISO_GPIO != SPI_GPIO_NO_MISO)
-+ gpio_free(SPI_MISO_GPIO);
- free_mosi:
-- gpio_free(SPI_MOSI_GPIO);
-+ if (SPI_MOSI_GPIO != SPI_GPIO_NO_MOSI)
-+ gpio_free(SPI_MOSI_GPIO);
- done:
- return value;
- }
-@@ -277,6 +328,7 @@ static int __devinit spi_gpio_probe(stru
- struct spi_master *master;
- struct spi_gpio *spi_gpio;
- struct spi_gpio_platform_data *pdata;
-+ u16 master_flags = 0;
-
- pdata = pdev->dev.platform_data;
- #ifdef GENERIC_BITBANG
-@@ -284,7 +336,7 @@ static int __devinit spi_gpio_probe(stru
- return -ENODEV;
- #endif
-
-- status = spi_gpio_request(pdata, dev_name(&pdev->dev));
-+ status = spi_gpio_request(pdata, dev_name(&pdev->dev), &master_flags);
- if (status < 0)
- return status;
-
-@@ -300,6 +352,7 @@ static int __devinit spi_gpio_probe(stru
- if (pdata)
- spi_gpio->pdata = *pdata;
-
-+ master->flags = master_flags;
- master->bus_num = pdev->id;
- master->num_chipselect = SPI_N_CHIPSEL;
- master->setup = spi_gpio_setup;
-@@ -307,10 +360,18 @@ static int __devinit spi_gpio_probe(stru
-
- spi_gpio->bitbang.master = spi_master_get(master);
- spi_gpio->bitbang.chipselect = spi_gpio_chipselect;
-- spi_gpio->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_txrx_word_mode0;
-- spi_gpio->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_txrx_word_mode1;
-- spi_gpio->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_txrx_word_mode2;
-- spi_gpio->bitbang.txrx_word[SPI_MODE_3] = spi_gpio_txrx_word_mode3;
-+
-+ if ((master_flags & (SPI_MASTER_NO_RX | SPI_MASTER_NO_RX)) == 0) {
-+ spi_gpio->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_txrx_word_mode0;
-+ spi_gpio->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_txrx_word_mode1;
-+ spi_gpio->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_txrx_word_mode2;
-+ spi_gpio->bitbang.txrx_word[SPI_MODE_3] = spi_gpio_txrx_word_mode3;
-+ } else {
-+ spi_gpio->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_spec_txrx_word_mode0;
-+ spi_gpio->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_spec_txrx_word_mode1;
-+ spi_gpio->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_spec_txrx_word_mode2;
-+ spi_gpio->bitbang.txrx_word[SPI_MODE_3] = spi_gpio_spec_txrx_word_mode3;
-+ }
- spi_gpio->bitbang.setup_transfer = spi_bitbang_setup_transfer;
- spi_gpio->bitbang.flags = SPI_CS_HIGH;
-
-@@ -318,8 +379,10 @@ static int __devinit spi_gpio_probe(stru
- if (status < 0) {
- spi_master_put(spi_gpio->bitbang.master);
- gpio_free:
-- gpio_free(SPI_MISO_GPIO);
-- gpio_free(SPI_MOSI_GPIO);
-+ if (SPI_MISO_GPIO != SPI_GPIO_NO_MISO)
-+ gpio_free(SPI_MISO_GPIO);
-+ if (SPI_MOSI_GPIO != SPI_GPIO_NO_MOSI)
-+ gpio_free(SPI_MOSI_GPIO);
- gpio_free(SPI_SCK_GPIO);
- spi_master_put(master);
- }
-@@ -342,8 +405,10 @@ static int __devexit spi_gpio_remove(str
-
- platform_set_drvdata(pdev, NULL);
-
-- gpio_free(SPI_MISO_GPIO);
-- gpio_free(SPI_MOSI_GPIO);
-+ if (SPI_MISO_GPIO != SPI_GPIO_NO_MISO)
-+ gpio_free(SPI_MISO_GPIO);
-+ if (SPI_MOSI_GPIO != SPI_GPIO_NO_MOSI)
-+ gpio_free(SPI_MOSI_GPIO);
- gpio_free(SPI_SCK_GPIO);
-
- return status;
---- a/include/linux/spi/spi_gpio.h
-+++ b/include/linux/spi/spi_gpio.h
-@@ -29,11 +29,16 @@
- * SPI_GPIO_NO_CHIPSELECT to the controller_data:
- * .controller_data = (void *) SPI_GPIO_NO_CHIPSELECT;
- *
-+ * If the MISO or MOSI pin is not available then it should be set to
-+ * SPI_GPIO_NO_MISO or SPI_GPIO_NO_MOSI.
-+ *
- * If the bitbanged bus is later switched to a "native" controller,
- * that platform_device and controller_data should be removed.
- */
-
- #define SPI_GPIO_NO_CHIPSELECT ((unsigned long)-1l)
-+#define SPI_GPIO_NO_MISO ((unsigned long)-1l)
-+#define SPI_GPIO_NO_MOSI ((unsigned long)-1l)
-
- /**
- * struct spi_gpio_platform_data - parameter for bitbanged SPI master
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-30 11:37:05 +0000