[ARM] 3534/1: add spi support to lubbock platform (9df5db80) · Commits · 戴 / test

arch/arm/mach-pxa/lubbock.c

+84 −0

Original line number	Diff line number	Diff line
		@@ -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);

Admin message