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);