MIPS: Alchemy: Touchscreen support on DB1100

Wire up the ADS7846 touchscreen controller on the DB1100.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2879/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/arch/mips/alchemy/devboards/db1000.c b/arch/mips/alchemy/devboards/db1000.c
index 5206d2fbe0c6..1b81dbf6b804 100644
--- a/arch/mips/alchemy/devboards/db1000.c
+++ b/arch/mips/alchemy/devboards/db1000.c
@@ -28,6 +28,9 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_gpio.h>
+#include <linux/spi/ads7846.h>
 #include <asm/mach-au1x00/au1000.h>
 #include <asm/mach-au1x00/au1000_dma.h>
 #include <asm/mach-au1x00/au1100_mmc.h>
@@ -424,6 +427,43 @@ static struct platform_device db1000_irda_dev = {
         .num_resources  = ARRAY_SIZE(au1000_irda_res),
 };
 
+/******************************************************************************/
+
+static struct ads7846_platform_data db1100_touch_pd = {
+        .model          = 7846,
+        .vref_mv        = 3300,
+        .gpio_pendown   = 21,
+};
+
+static struct spi_gpio_platform_data db1100_spictl_pd = {
+        .sck            = 209,
+        .mosi           = 208,
+        .miso           = 207,
+        .num_chipselect = 1,
+};
+
+static struct spi_board_info db1100_spi_info[] __initdata = {
+        [0] = {
+                .modalias        = "ads7846",
+                .max_speed_hz    = 3250000,
+                .bus_num         = 0,
+                .chip_select     = 0,
+                .mode            = 0,
+                .irq             = AU1100_GPIO21_INT,
+                .platform_data   = &db1100_touch_pd,
+                .controller_data = (void *)210, /* for spi_gpio: CS# GPIO210 */
+        },
+};
+
+static struct platform_device db1100_spi_dev = {
+        .name           = "spi_gpio",
+        .id             = 0,
+        .dev            = {
+                .platform_data  = &db1100_spictl_pd,
+        },
+};
+
+
 static struct platform_device *db1x00_devs[] = {
         &db1x00_codec_dev,
         &alchemy_ac97c_dma_dev,
@@ -440,12 +480,14 @@ static struct platform_device *db1100_devs[] = {
         &db1100_mmc0_dev,
         &db1100_mmc1_dev,
         &db1000_irda_dev,
+        &db1100_spi_dev,
 };
 
 static int __init db1000_dev_init(void)
 {
         int board = BCSR_WHOAMI_BOARD(bcsr_read(BCSR_WHOAMI));
         int c0, c1, d0, d1, s0, s1;
+        unsigned long pfc;
 
         if (board == BCSR_WHOAMI_DB1500) {
                 c0 = AU1500_GPIO2_INT;
@@ -464,6 +506,20 @@ static int __init db1000_dev_init(void)
 
                 gpio_direction_input(19);       /* sd0 cd# */
                 gpio_direction_input(20);       /* sd1 cd# */
+                gpio_direction_input(21);       /* touch pendown# */
+                gpio_direction_input(207);      /* SPI MISO */
+                gpio_direction_output(208, 0);  /* SPI MOSI */
+                gpio_direction_output(209, 1);  /* SPI SCK */
+                gpio_direction_output(210, 1);  /* SPI CS# */
+
+                /* spi_gpio on SSI0 pins */
+                pfc = __raw_readl((void __iomem *)SYS_PINFUNC);
+                pfc |= (1 << 0);        /* SSI0 pins as GPIOs */
+                __raw_writel(pfc, (void __iomem *)SYS_PINFUNC);
+                wmb();
+
+                spi_register_board_info(db1100_spi_info,
+                                        ARRAY_SIZE(db1100_spi_info));
 
                 platform_add_devices(db1100_devs, ARRAY_SIZE(db1100_devs));
         } else if (board == BCSR_WHOAMI_DB1000) {