Implement GPIO interrupt debouncing.


Index: linux-2.6.17-git10/arch/arm/mach-ep93xx/core.c
===================================================================
--- linux-2.6.17-git10.orig/arch/arm/mach-ep93xx/core.c
+++ linux-2.6.17-git10/arch/arm/mach-ep93xx/core.c
@@ -154,6 +154,7 @@ struct sys_timer ep93xx_timer = {
  * GPIO handling for EP93xx
  *************************************************************************/
 static unsigned char gpio_int_enable[2];
+static unsigned char gpio_int_debounce[2];
 static unsigned char gpio_int_type1[2];
 static unsigned char gpio_int_type2[2];
 
@@ -161,11 +162,13 @@ static void update_gpio_ab_int_params(in
 {
 	if (port == 0) {
 		__raw_writeb(0, EP93XX_GPIO_A_INT_ENABLE);
+		__raw_writeb(gpio_int_debounce[0], EP93XX_GPIO_A_INT_DEBOUNCE);
 		__raw_writeb(gpio_int_type2[0], EP93XX_GPIO_A_INT_TYPE2);
 		__raw_writeb(gpio_int_type1[0], EP93XX_GPIO_A_INT_TYPE1);
 		__raw_writeb(gpio_int_enable[0], EP93XX_GPIO_A_INT_ENABLE);
 	} else if (port == 1) {
 		__raw_writeb(0, EP93XX_GPIO_B_INT_ENABLE);
+		__raw_writeb(gpio_int_debounce[1], EP93XX_GPIO_B_INT_DEBOUNCE);
 		__raw_writeb(gpio_int_type2[1], EP93XX_GPIO_B_INT_TYPE2);
 		__raw_writeb(gpio_int_type1[1], EP93XX_GPIO_B_INT_TYPE1);
 		__raw_writeb(gpio_int_enable[1], EP93XX_GPIO_B_INT_ENABLE);
@@ -331,6 +334,13 @@ static int ep93xx_gpio_ab_irq_type(unsig
 		gpio_int_type1[port] &= ~(1 << line);
 		gpio_int_type2[port] &= ~(1 << line);
 	}
+
+	if (type & IRQT_DEBOUNCE) {
+		gpio_int_debounce[port] |= 1 << line;
+	} else {
+		gpio_int_debounce[port] &= ~(1 << line);
+	}
+
 	update_gpio_ab_int_params(port);
 
 	return 0;
Index: linux-2.6.17-git10/include/asm-arm/arch-ep93xx/ep93xx-regs.h
===================================================================
--- linux-2.6.17-git10.orig/include/asm-arm/arch-ep93xx/ep93xx-regs.h
+++ linux-2.6.17-git10/include/asm-arm/arch-ep93xx/ep93xx-regs.h
@@ -77,11 +77,13 @@
 #define EP93XX_GPIO_A_INT_ACK		EP93XX_GPIO_REG(0x98)
 #define EP93XX_GPIO_A_INT_ENABLE	EP93XX_GPIO_REG(0x9c)
 #define EP93XX_GPIO_A_INT_STATUS	EP93XX_GPIO_REG(0xa0)
+#define EP93XX_GPIO_A_INT_DEBOUNCE	EP93XX_GPIO_REG(0xa8)
 #define EP93XX_GPIO_B_INT_TYPE1		EP93XX_GPIO_REG(0xac)
 #define EP93XX_GPIO_B_INT_TYPE2		EP93XX_GPIO_REG(0xb0)
 #define EP93XX_GPIO_B_INT_ACK		EP93XX_GPIO_REG(0xb4)
 #define EP93XX_GPIO_B_INT_ENABLE	EP93XX_GPIO_REG(0xb8)
 #define EP93XX_GPIO_B_INT_STATUS	EP93XX_GPIO_REG(0xbc)
+#define EP93XX_GPIO_B_INT_DEBOUNCE	EP93XX_GPIO_REG(0xc4)
 
 #define EP93XX_AAC_BASE			(EP93XX_APB_VIRT_BASE + 0x00080000)
 
Index: linux-2.6.17-git10/include/asm-arm/irq.h
===================================================================
--- linux-2.6.17-git10.orig/include/asm-arm/irq.h
+++ linux-2.6.17-git10/include/asm-arm/irq.h
@@ -41,6 +41,7 @@ extern void enable_irq(unsigned int);
 #define IRQT_LOW	(__IRQT_LOWLVL)
 #define IRQT_HIGH	(__IRQT_HIGHLVL)
 #define IRQT_PROBE	(1 << 4)
+#define IRQT_DEBOUNCE	(1 << 5)
 
 int set_irq_type(unsigned int irq, unsigned int type);
 void disable_irq_wake(unsigned int irq);