[PATCH] ARM: OMAP: make Mistral support explicit

This starts packaging support for the Mistral board and its devices
separately from OSK framebuffer support, and supports the "wakeup"
button (SW1) on that board.  This involved some mux fixes, both for
the MicroWire stuff (!) and for MPUIO2.

There's still a lot more to be done ... currently the board-specific
setup for the LCD, keypad, touchscreen, and so forth is scattered
throughout several drivers, rather than gathered in one place where
it's more naturally updated to match board revisions (or replaced
for folk using different UI boards).
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap1/Kconfig

@@ -47,6 +47,14 @@ config MACH_OMAP_OSK
 	  TI OMAP 5912 OSK (OMAP Starter Kit) board support. Say Y here
           if you have such a board.
 
+config OMAP_OSK_MISTRAL
+	bool "Mistral QVGA board Support"
+	depends on MACH_OMAP_OSK
+    	help
+	  The OSK supports an optional add-on board with a Quarter-VGA
+	  touchscreen, PDA-ish buttons, a resume button, bicolor LED,
+	  and camera connector.  Say Y here if you have this board.
+
 config MACH_OMAP_PERSEUS2
 	bool "TI Perseus2"
 	depends on ARCH_OMAP1 && ARCH_OMAP730

arch/arm/mach-omap1/board-osk.c

@@ -29,6 +29,8 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/device.h>
+#include <linux/interrupt.h>
+
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
 
@@ -189,6 +191,54 @@ static struct omap_board_config_kernel osk_config[] = {
 	{ OMAP_TAG_USB,           &osk_usb_config },
 };
 
+#ifdef	CONFIG_OMAP_OSK_MISTRAL
+
+#ifdef	CONFIG_PM
+static irqreturn_t
+osk_mistral_wake_interrupt(int irq, void *ignored, struct pt_regs *regs)
+{
+	return IRQ_HANDLED;
+}
+#endif
+
+static void __init osk_mistral_init(void)
+{
+	/* FIXME here's where to feed in framebuffer, touchpad, and
+	 * keyboard setup ...  not in the drivers for those devices!
+	 *
+	 * NOTE:  we could actually tell if there's a Mistral board
+	 * attached, e.g. by trying to read something from the ads7846.
+	 * But this is too early for that...
+	 */
+
+	/* the sideways button (SW1) is for use as a "wakeup" button */
+	omap_cfg_reg(N15_1610_MPUIO2);
+	if (omap_request_gpio(OMAP_MPUIO(2)) == 0) {
+		int ret = 0;
+		omap_set_gpio_direction(OMAP_MPUIO(2), 1);
+		set_irq_type(OMAP_GPIO_IRQ(OMAP_MPUIO(2)), IRQT_RISING);
+#ifdef	CONFIG_PM
+		/* share the IRQ in case someone wants to use the
+		 * button for more than wakeup from system sleep.
+		 */
+		ret = request_irq(OMAP_GPIO_IRQ(OMAP_MPUIO(2)),
+				&osk_mistral_wake_interrupt,
+				SA_SHIRQ, "mistral_wakeup",
+				&osk_mistral_wake_interrupt);
+		if (ret != 0) {
+			omap_free_gpio(OMAP_MPUIO(2));
+			printk(KERN_ERR "OSK+Mistral: no wakeup irq, %d?\n",
+				ret);
+		} else
+			enable_irq_wake(OMAP_GPIO_IRQ(OMAP_MPUIO(2)));
+#endif
+	} else
+		printk(KERN_ERR "OSK+Mistral: wakeup button is awol\n");
+}
+#else
+static void __init osk_mistral_init(void) { }
+#endif
+
 static void __init osk_init(void)
 {
 	osk_flash_resource.end = osk_flash_resource.start = omap_cs3_phys();
@@ -197,6 +247,8 @@ static void __init osk_init(void)
 	omap_board_config = osk_config;
 	omap_board_config_size = ARRAY_SIZE(osk_config);
 	USB_TRANSCEIVER_CTRL_REG |= (3 << 1);
+
+	osk_mistral_init();
 }
 
 static void __init osk_map_io(void)

arch/arm/mach-omap1/leds-osk.c

@@ -64,7 +64,7 @@ static void tps_work(void *unused)
 
 static DECLARE_WORK(work, tps_work, NULL);
 
-#ifdef	CONFIG_FB_OMAP
+#ifdef	CONFIG_OMAP_OSK_MISTRAL
 
 /* For now, all system indicators require the Mistral board, since that
  * LED can be manipulated without a task context.  This LED is either red,
@@ -127,7 +127,7 @@ void osk_leds_event(led_event_t evt)
 		hw_led_state = 0;
 		break;
 
-#ifdef	CONFIG_FB_OMAP
+#ifdef	CONFIG_OMAP_OSK_MISTRAL
 
 	case led_timer:
 		hw_led_state ^= TIMER_LED;
@@ -144,7 +144,7 @@ void osk_leds_event(led_event_t evt)
 		mistral_setled();
 		break;
 
-#endif	/* CONFIG_FB_OMAP */
+#endif	/* CONFIG_OMAP_OSK_MISTRAL */
 
 	/* "green" == tps LED1 (leftmost, normally power-good)
 	 * works only with DC adapter, not on battery power!

arch/arm/mach-omap1/leds.c

@@ -34,7 +34,10 @@ omap_leds_init(void)
 	if (machine_is_omap_h2()
 			|| machine_is_omap_h3()
 			|| machine_is_omap_perseus2()
-			|| machine_is_omap_osk()) {
+#ifdef	CONFIG_OMAP_OSK_MISTRAL
+			|| machine_is_omap_osk()
+#endif
+			) {
 
 		/* LED1/LED2 pins can be used as GPIO (as done here), or by
 		 * the LPG (works even in deep sleep!), to drive a bicolor

drivers/input/touchscreen/omap/ts_osk.c

@@ -83,6 +83,7 @@ static int osk_ts_penup(void)
 
 static int  __init osk_ts_probe(struct omap_ts_t *ts)
 {
+#ifdef	CONFIG_OMAP_OSK_MISTRAL
 	if (!machine_is_omap_osk())
 		return -ENODEV;
 
@@ -100,7 +101,15 @@ static int  __init osk_ts_probe(struct omap_ts_t *ts)
 		                                    UWIRE_CS_ACTIVE_LOW |
 				                    UWIRE_FREQ_DIV_2);
 
+	/* FIXME verify there's really a Mistral board:
+	 * see if the AD7846 chip responds.
+	 */
+
+	/* NOTE:  no VREF; must ignore the temp, VBAT, and AUX sensors */
 	return 0;
+#else
+	return -ENODEV;
+#endif
 }
 
 static void osk_ts_read(u16 *data)

drivers/ssi/omap-uwire.c

@@ -200,11 +200,18 @@ static int __init omap_uwire_init(void)
 		uwire_idx_shift = 2;
 
 	uwire_write_reg(UWIRE_SR3, 1);
-	if (machine_is_omap_h2() || machine_is_omap_osk()) {
+	if (machine_is_omap_h2()) {
 		/* defaults: W21 SDO, U18 SDI, V19 SCL */
 		omap_cfg_reg(N14_1610_UWIRE_CS0);
 		omap_cfg_reg(N15_1610_UWIRE_CS1);
 	}
+	if (machine_is_omap_osk()) {
+		/* this is the standard expansion connector usage, with
+		 * the other chipselect pins for MPUIO2 and MPUIO4.
+		 */
+		omap_cfg_reg(N14_1610_UWIRE_CS0);
+		omap_cfg_reg(P15_1610_UWIRE_CS3);
+	}
 	if (machine_is_omap_perseus2()) {
 		/* configure pins: MPU_UW_nSCS1, MPU_UW_SDO, MPU_UW_SCLK */
 		int val = omap_readl(OMAP730_IO_CONF_9) & ~0x00EEE000;

include/asm-arm/arch-omap/mux.h

@@ -185,6 +185,7 @@ typedef enum {
 
 	/* MPUIO */
 	MPUIO2,
+	N15_1610_MPUIO2,
 	MPUIO4,
 	MPUIO5,
 	T20_1610_MPUIO5,
@@ -252,7 +253,7 @@ typedef enum {
 	U18_1610_UWIRE_SDI,
 	W21_1610_UWIRE_SDO,
 	N14_1610_UWIRE_CS0,
-	P15_1610_UWIRE_CS0,
+	P15_1610_UWIRE_CS3,
 	N15_1610_UWIRE_CS1,
 
 	/* OMAP-1610 Flash */
@@ -413,7 +414,8 @@ MUX_CFG("N21_1710_GPIO14",       6,    9,    0,   1,   1,   1,    1,     1,  1)
 MUX_CFG("W15_1710_GPIO40",       9,   27,    7,   2,   5,   1,    2,     1,  1)
 
 /* MPUIO */
-MUX_CFG("MPUIO2",		 7,   18,    0,	  1,   1,   1,	 NA,	 0,  1)
+MUX_CFG("MPUIO2",		 7,   18,    0,	  1,  14,   1,	 NA,	 0,  1)
+MUX_CFG("N15_1610_MPUIO2",	 7,   18,    0,	  1,  14,   1,	  1,	 0,  1)
 MUX_CFG("MPUIO4",		 7,   15,    0,	  1,  13,   1,	 NA,	 0,  1)
 MUX_CFG("MPUIO5",		 7,   12,    0,	  1,  12,   1,	 NA,	 0,  1)