[PATCH 12/15] OMAP: GPIO: Fix: use wake set/clear regs

[Tarun Kanti DebBarma <tarun.kanti@ti.com>]

From: Charulatha V <charu@ti.com>

In set_24xx_gpio_triggering(), for OMAP4, GPIO wakeup request
is set for all type of GPIO triggers whereas as per TRM the GPIO
wakeup request can only be generated on edge transitions. Fix this.

In set_24xx_gpio_triggering(), OMAP4_GPIO_IRQWAKEN0 register
is used for wakeup request and the GPIO set/clear wakeup registers
are not used in OMAP4 but is handled without retaining it's old
value. This would corrupt the contents of OMAP4_GPIO_IRQWAKEN0
register by writing the value of the last requested GPIO pin in
a given bank. This can be avoided by making use of GPIO set/clear
wakeup registers.

Signed-off-by: Charulatha V <charu@ti.com>
---
 arch/arm/mach-omap2/gpio.c |    4 ++--
 drivers/gpio/gpio_omap.c   |   32 ++++++++++----------------------
 2 files changed, 12 insertions(+), 24 deletions(-)

diff --git a/arch/arm/mach-omap2/gpio.c b/arch/arm/mach-omap2/gpio.c
index 5c888dd..fbedbbb 100644
--- a/arch/arm/mach-omap2/gpio.c
+++ b/arch/arm/mach-omap2/gpio.c
@@ -142,8 +142,8 @@ static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
 		pdata->regs->risingdetect = OMAP4_GPIO_RISINGDETECT;
 		pdata->regs->fallingdetect = OMAP4_GPIO_FALLINGDETECT;
 		pdata->regs->wkupstatus = OMAP4_GPIO_IRQWAKEN0;
-		pdata->regs->wkupclear = OMAP4_GPIO_IRQWAKEN0;
-		pdata->regs->wkupset = OMAP4_GPIO_IRQWAKEN0;
+		pdata->regs->wkupclear = OMAP4_GPIO_CLEARWKUENA;
+		pdata->regs->wkupset = OMAP4_GPIO_SETWKUENA;
 		break;
 	default:
 		WARN(1, "Invalid gpio bank_type\n");
diff --git a/drivers/gpio/gpio_omap.c b/drivers/gpio/gpio_omap.c
index 05c2857..762d73c 100644
--- a/drivers/gpio/gpio_omap.c
+++ b/drivers/gpio/gpio_omap.c
@@ -229,30 +229,18 @@ static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio,
 		MOD_REG_BIT(OMAP24XX_GPIO_FALLINGDETECT, gpio_bit,
 			trigger & IRQ_TYPE_EDGE_FALLING);
 	}
+
 	if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
-		if (cpu_is_omap44xx()) {
-			if (trigger != 0)
-				__raw_writel(1 << gpio, bank->base+
-						OMAP4_GPIO_IRQWAKEN0);
-			else {
-				val = __raw_readl(bank->base +
-							OMAP4_GPIO_IRQWAKEN0);
-				__raw_writel(val & (~(1 << gpio)), bank->base +
-							 OMAP4_GPIO_IRQWAKEN0);
-			}
-		} else {
-			/*
-			 * GPIO wakeup request can only be generated on edge
-			 * transitions
-			 */
-			if (trigger & IRQ_TYPE_EDGE_BOTH)
-				__raw_writel(1 << gpio, bank->base
-					+ OMAP24XX_GPIO_SETWKUENA);
-			else
-				__raw_writel(1 << gpio, bank->base
-					+ OMAP24XX_GPIO_CLEARWKUENA);
-		}
+		/*
+		 * GPIO wakeup request can only be generated on edge
+		 * transitions
+		 */
+		if (trigger & IRQ_TYPE_EDGE_BOTH)
+			__raw_writel(1 << gpio, bank->wake_set);
+		else
+			__raw_writel(1 << gpio, bank->wake_clear);
 	}
+
 	/* This part needs to be executed always for OMAP34xx */
 	if (cpu_is_omap34xx() || (bank->non_wakeup_gpios & gpio_bit)) {
 		/*
-- 
1.6.0.4