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-rw-r--r--arch/arm/mach-pxa/lubbock.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/lubbock.c b/arch/arm/mach-pxa/lubbock.c
index 3e26d7ce5bb2..1ab26c6914f2 100644
--- a/arch/arm/mach-pxa/lubbock.c
+++ b/arch/arm/mach-pxa/lubbock.c
@@ -22,6 +22,10 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/ads7846.h>
+#include <asm/arch/pxa2xx_spi.h>
+
#include <asm/setup.h>
#include <asm/memory.h>
#include <asm/mach-types.h>
@@ -196,6 +200,78 @@ static struct resource smc91x_resources[] = {
},
};
+/* ADS7846 is connected through SSP ... and if your board has J5 populated,
+ * you can select it to replace the ucb1400 by switching the touchscreen cable
+ * (to J5) and poking board registers (as done below). Else it's only useful
+ * for the temperature sensors.
+ */
+static struct resource pxa_ssp_resources[] = {
+ [0] = {
+ .start = __PREG(SSCR0_P(1)),
+ .end = __PREG(SSCR0_P(1)) + 0x14,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = IRQ_SSP,
+ .end = IRQ_SSP,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct pxa2xx_spi_master pxa_ssp_master_info = {
+ .ssp_type = PXA25x_SSP,
+ .clock_enable = CKEN3_SSP,
+ .num_chipselect = 0,
+};
+
+static struct platform_device pxa_ssp = {
+ .name = "pxa2xx-spi",
+ .id = 1,
+ .resource = pxa_ssp_resources,
+ .num_resources = ARRAY_SIZE(pxa_ssp_resources),
+ .dev = {
+ .platform_data = &pxa_ssp_master_info,
+ },
+};
+
+static int lubbock_ads7846_pendown_state(void)
+{
+ /* TS_BUSY is bit 8 in LUB_MISC_RD, but pendown is irq-only */
+ return 0;
+}
+
+static struct ads7846_platform_data ads_info = {
+ .model = 7846,
+ .vref_delay_usecs = 100, /* internal, no cap */
+ .get_pendown_state = lubbock_ads7846_pendown_state,
+ // .x_plate_ohms = 500, /* GUESS! */
+ // .y_plate_ohms = 500, /* GUESS! */
+};
+
+static void ads7846_cs(u32 command)
+{
+ static const unsigned TS_nCS = 1 << 11;
+ lubbock_set_misc_wr(TS_nCS, (command == PXA2XX_CS_ASSERT) ? 0 : TS_nCS);
+}
+
+static struct pxa2xx_spi_chip ads_hw = {
+ .tx_threshold = 1,
+ .rx_threshold = 2,
+ .cs_control = ads7846_cs,
+};
+
+static struct spi_board_info spi_board_info[] __initdata = { {
+ .modalias = "ads7846",
+ .platform_data = &ads_info,
+ .controller_data = &ads_hw,
+ .irq = LUBBOCK_BB_IRQ,
+ .max_speed_hz = 120000 /* max sample rate at 3V */
+ * 26 /* command + data + overhead */,
+ .bus_num = 1,
+ .chip_select = 0,
+},
+};
+
static struct platform_device smc91x_device = {
.name = "smc91x",
.id = -1,
@@ -272,6 +348,7 @@ static struct platform_device *devices[] __initdata = {
&smc91x_device,
&lubbock_flash_device[0],
&lubbock_flash_device[1],
+ &pxa_ssp,
};
static struct pxafb_mach_info sharp_lm8v31 __initdata = {
@@ -400,6 +477,8 @@ static void __init lubbock_init(void)
lubbock_flash_data[flashboot^1].name = "application-flash";
lubbock_flash_data[flashboot].name = "boot-rom";
(void) platform_add_devices(devices, ARRAY_SIZE(devices));
+
+ spi_register_board_info(spi_board_info, ARRAY_SIZE(spi_board_info));
}
static struct map_desc lubbock_io_desc[] __initdata = {
@@ -416,6 +495,11 @@ static void __init lubbock_map_io(void)
pxa_map_io();
iotable_init(lubbock_io_desc, ARRAY_SIZE(lubbock_io_desc));
+ /* SSP data pins */
+ pxa_gpio_mode(GPIO23_SCLK_MD);
+ pxa_gpio_mode(GPIO25_STXD_MD);
+ pxa_gpio_mode(GPIO26_SRXD_MD);
+
/* This enables the BTUART */
pxa_gpio_mode(GPIO42_BTRXD_MD);
pxa_gpio_mode(GPIO43_BTTXD_MD);
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