[PATCH] Allow OMAP3 GPIO wakeup from power off.

[Russ Dill <russ.dill@xxxxxxxxx>]

This patch configures the wakeup padconf registers to reflect the sysfs
power/wakeup settings. This allows a GPIO to wake the processor from
off mode.

Signed-off-by: Russ Dill <Russ.Dill@xxxxxxxxx>

---
 arch/arm/plat-omap/gpio.c |   58 ++++++++++++++++++++++++++++++--------------
 1 files changed, 39 insertions(+), 19 deletions(-)

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index 64852db..3b2054b 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -277,7 +277,14 @@ static const struct gpio_pad_range gpio_pads_config[] = {
 	{ 170, 182, 0x1c6 },
 	{ 0, 0, 0x1e0 },
 	{ 186, 186, 0x1e2 },
+	{ 187, 187, 0x238 },
+	{ 32, 32, 0x23a },
 	{ 12, 29, 0x5d8 },
+	{ 1, 1, 0xa06 },
+	{ 30, 30, 0xa08 },
+	{ 2, 10, 0xa0a },
+	{ 11, 11, 0xa24 },
+	{ 31, 31, 0xa26 },
 };
 
 /* GPIO -> PAD config mapping for OMAP3 */
@@ -289,7 +296,8 @@ struct gpio_pad {
 
 #define OMAP34XX_GPIO_AMT	(32 * OMAP34XX_NR_GPIOS)
 
-struct gpio_pad *gpio_pads;
+static struct gpio_pad *gpio_pads;
+static u16 gpio_pad_map[OMAP34XX_GPIO_AMT];
 #endif
 
 static struct gpio_bank *gpio_bank;
@@ -1353,32 +1361,21 @@ static int __init omap3_gpio_pads_init(void)
 {
 	int i, j, min, max, gpio_amt;
 	u16 offset;
-	u16 *gpio_pad_map;
 
 	gpio_amt = 0;
 
-	gpio_pad_map = kzalloc(sizeof(u16) * OMAP34XX_GPIO_AMT, GFP_KERNEL);
-	if (gpio_pad_map == NULL) {
-		printk(KERN_ERR "FATAL: Failed to allocate gpio_pad_map\n");
-		return -ENOMEM;
-	}
-
 	for (i = 0; i < ARRAY_SIZE(gpio_pads_config); i++) {
 		min = gpio_pads_config[i].min;
 		max = gpio_pads_config[i].max;
 		offset = gpio_pads_config[i].offset;
 
 		for (j = min; j <= max; j++) {
-			/*
-			 * Check if pad has been configured as GPIO.
-			 * First module (gpio 0...31) is ignored as it is
-			 * in wakeup domain and does not need special
-			 * handling during off mode.
-			 */
-			if (j > 31 && (omap_ctrl_readw(offset) &
+			/* Check if pad has been configured as GPIO. */
+			if ((omap_ctrl_readw(offset) &
 				OMAP34XX_MUX_MODE7) == OMAP34XX_MUX_MODE4) {
 				gpio_pad_map[j] = offset;
-				gpio_amt++;
+				if (j > 31)
+					gpio_amt++;
 			}
 			offset += 2;
 		}
@@ -1388,20 +1385,23 @@ static int __init omap3_gpio_pads_init(void)
 
 	if (gpio_pads == NULL) {
 		printk(KERN_ERR "FATAL: Failed to allocate gpio_pads\n");
-		kfree(gpio_pad_map);
 		return -ENOMEM;
 	}
 
 	gpio_amt = 0;
 	for (i = 0; i < OMAP34XX_GPIO_AMT; i++) {
-		if (gpio_pad_map[i] != 0) {
+		/*
+		 * First module (gpio 0...31) is ignored as it is
+		 * in wakeup domain and does not need special
+		 * handling during off mode.
+		 */
+		if (gpio_pad_map[i] && i > 31) {
 			gpio_pads[gpio_amt].gpio = i;
 			gpio_pads[gpio_amt].offset = gpio_pad_map[i];
 			gpio_amt++;
 		}
 	}
 	gpio_pads[gpio_amt].gpio = -1;
-	kfree(gpio_pad_map);
 	return 0;
 }
 late_initcall(omap3_gpio_pads_init);
@@ -1676,6 +1676,26 @@ static int omap_gpio_suspend(struct sys_device *dev, pm_message_t mesg)
 		__raw_writel(0xffffffff, wake_clear);
 		__raw_writel(bank->suspend_wakeup, wake_set);
 		spin_unlock_irqrestore(&bank->lock, flags);
+
+#ifdef CONFIG_ARCH_OMAP34XX
+		if (bank->method == METHOD_GPIO_24XX) {
+			int j;
+			for (j = 0; j < 32; j++) {
+				int offset = gpio_pad_map[j + i * 32];
+				u16 v;
+
+				if (!offset)
+					continue;
+
+				v = omap_ctrl_readw(offset);
+				if (bank->suspend_wakeup & (1 << j))
+					v |= OMAP3_PADCONF_WAKEUPENABLE0;
+				else
+					v &= ~OMAP3_PADCONF_WAKEUPENABLE0;
+				omap_ctrl_writew(v, offset);
+			}
+		}
+#endif
 	}
 
 	return 0;
-- 
1.6.0.4

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