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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 @@
22#include <linux/mtd/mtd.h> 22#include <linux/mtd/mtd.h>
23#include <linux/mtd/partitions.h> 23#include <linux/mtd/partitions.h>
24 24
25#include <linux/spi/spi.h>
26#include <linux/spi/ads7846.h>
27#include <asm/arch/pxa2xx_spi.h>
28
25#include <asm/setup.h> 29#include <asm/setup.h>
26#include <asm/memory.h> 30#include <asm/memory.h>
27#include <asm/mach-types.h> 31#include <asm/mach-types.h>
@@ -196,6 +200,78 @@ static struct resource smc91x_resources[] = {
196 }, 200 },
197}; 201};
198 202
203/* ADS7846 is connected through SSP ... and if your board has J5 populated,
204 * you can select it to replace the ucb1400 by switching the touchscreen cable
205 * (to J5) and poking board registers (as done below). Else it's only useful
206 * for the temperature sensors.
207 */
208static struct resource pxa_ssp_resources[] = {
209 [0] = {
210 .start = __PREG(SSCR0_P(1)),
211 .end = __PREG(SSCR0_P(1)) + 0x14,
212 .flags = IORESOURCE_MEM,
213 },
214 [1] = {
215 .start = IRQ_SSP,
216 .end = IRQ_SSP,
217 .flags = IORESOURCE_IRQ,
218 },
219};
220
221static struct pxa2xx_spi_master pxa_ssp_master_info = {
222 .ssp_type = PXA25x_SSP,
223 .clock_enable = CKEN3_SSP,
224 .num_chipselect = 0,
225};
226
227static struct platform_device pxa_ssp = {
228 .name = "pxa2xx-spi",
229 .id = 1,
230 .resource = pxa_ssp_resources,
231 .num_resources = ARRAY_SIZE(pxa_ssp_resources),
232 .dev = {
233 .platform_data = &pxa_ssp_master_info,
234 },
235};
236
237static int lubbock_ads7846_pendown_state(void)
238{
239 /* TS_BUSY is bit 8 in LUB_MISC_RD, but pendown is irq-only */
240 return 0;
241}
242
243static struct ads7846_platform_data ads_info = {
244 .model = 7846,
245 .vref_delay_usecs = 100, /* internal, no cap */
246 .get_pendown_state = lubbock_ads7846_pendown_state,
247 // .x_plate_ohms = 500, /* GUESS! */
248 // .y_plate_ohms = 500, /* GUESS! */
249};
250
251static void ads7846_cs(u32 command)
252{
253 static const unsigned TS_nCS = 1 << 11;
254 lubbock_set_misc_wr(TS_nCS, (command == PXA2XX_CS_ASSERT) ? 0 : TS_nCS);
255}
256
257static struct pxa2xx_spi_chip ads_hw = {
258 .tx_threshold = 1,
259 .rx_threshold = 2,
260 .cs_control = ads7846_cs,
261};
262
263static struct spi_board_info spi_board_info[] __initdata = { {
264 .modalias = "ads7846",
265 .platform_data = &ads_info,
266 .controller_data = &ads_hw,
267 .irq = LUBBOCK_BB_IRQ,
268 .max_speed_hz = 120000 /* max sample rate at 3V */
269 * 26 /* command + data + overhead */,
270 .bus_num = 1,
271 .chip_select = 0,
272},
273};
274
199static struct platform_device smc91x_device = { 275static struct platform_device smc91x_device = {
200 .name = "smc91x", 276 .name = "smc91x",
201 .id = -1, 277 .id = -1,
@@ -272,6 +348,7 @@ static struct platform_device *devices[] __initdata = {
272 &smc91x_device, 348 &smc91x_device,
273 &lubbock_flash_device[0], 349 &lubbock_flash_device[0],
274 &lubbock_flash_device[1], 350 &lubbock_flash_device[1],
351 &pxa_ssp,
275}; 352};
276 353
277static struct pxafb_mach_info sharp_lm8v31 __initdata = { 354static struct pxafb_mach_info sharp_lm8v31 __initdata = {
@@ -400,6 +477,8 @@ static void __init lubbock_init(void)
400 lubbock_flash_data[flashboot^1].name = "application-flash"; 477 lubbock_flash_data[flashboot^1].name = "application-flash";
401 lubbock_flash_data[flashboot].name = "boot-rom"; 478 lubbock_flash_data[flashboot].name = "boot-rom";
402 (void) platform_add_devices(devices, ARRAY_SIZE(devices)); 479 (void) platform_add_devices(devices, ARRAY_SIZE(devices));
480
481 spi_register_board_info(spi_board_info, ARRAY_SIZE(spi_board_info));
403} 482}
404 483
405static struct map_desc lubbock_io_desc[] __initdata = { 484static struct map_desc lubbock_io_desc[] __initdata = {
@@ -416,6 +495,11 @@ static void __init lubbock_map_io(void)
416 pxa_map_io(); 495 pxa_map_io();
417 iotable_init(lubbock_io_desc, ARRAY_SIZE(lubbock_io_desc)); 496 iotable_init(lubbock_io_desc, ARRAY_SIZE(lubbock_io_desc));
418 497
498 /* SSP data pins */
499 pxa_gpio_mode(GPIO23_SCLK_MD);
500 pxa_gpio_mode(GPIO25_STXD_MD);
501 pxa_gpio_mode(GPIO26_SRXD_MD);
502
419 /* This enables the BTUART */ 503 /* This enables the BTUART */
420 pxa_gpio_mode(GPIO42_BTRXD_MD); 504 pxa_gpio_mode(GPIO42_BTRXD_MD);
421 pxa_gpio_mode(GPIO43_BTTXD_MD); 505 pxa_gpio_mode(GPIO43_BTTXD_MD);