ARM: OMAP: add 24xx GPIO debounce support

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/gpio.c

@@ -111,6 +111,8 @@
 #define OMAP24XX_GPIO_LEVELDETECT1	0x0044
 #define OMAP24XX_GPIO_RISINGDETECT	0x0048
 #define OMAP24XX_GPIO_FALLINGDETECT	0x004c
+#define OMAP24XX_GPIO_DEBOUNCE_EN	0x0050
+#define OMAP24XX_GPIO_DEBOUNCE_VAL	0x0054
 #define OMAP24XX_GPIO_CLEARIRQENABLE1	0x0060
 #define OMAP24XX_GPIO_SETIRQENABLE1	0x0064
 #define OMAP24XX_GPIO_CLEARWKUENA	0x0080
@@ -484,6 +486,43 @@ static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio, in
 	/* FIXME: Possibly do 'set_irq_handler(j, handle_level_irq)' if only level
 	 * triggering requested. */
 }
+
+void
+omap_set_gpio_debounce(int gpio, int enable)
+{
+	struct gpio_bank *bank;
+	void __iomem *reg;
+	u32 val, l = 1 << get_gpio_index(gpio);
+
+	bank = get_gpio_bank(gpio);
+	reg = bank->base;
+
+	reg += OMAP24XX_GPIO_DEBOUNCE_EN;
+	val = __raw_readl(reg);
+
+	if (enable)
+		val |= l;
+	else
+		val &= ~l;
+
+	__raw_writel(val, reg);
+}
+EXPORT_SYMBOL(omap_set_gpio_debounce);
+
+void
+omap_set_gpio_debounce_time(int gpio, int enc_time)
+{
+	struct gpio_bank *bank;
+	void __iomem *reg;
+
+	bank = get_gpio_bank(gpio);
+	reg = bank->base;
+
+	enc_time &= 0xff;
+	reg += OMAP24XX_GPIO_DEBOUNCE_VAL;
+	__raw_writel(enc_time, reg);
+}
+EXPORT_SYMBOL(omap_set_gpio_debounce_time);
 #endif
 
 static int _set_gpio_triggering(struct gpio_bank *bank, int gpio, int trigger)

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

@@ -78,6 +78,11 @@ extern int omap_get_gpio_datain(int gpio);
 extern void omap2_gpio_prepare_for_retention(void);
 extern void omap2_gpio_resume_after_retention(void);
 
+#ifdef CONFIG_ARCH_OMAP24XX
+extern void omap_set_gpio_debounce(int gpio, int enable);
+extern void omap_set_gpio_debounce_time(int gpio, int enable);
+#endif
+
 /*-------------------------------------------------------------------------*/
 
 /* wrappers for "new style" GPIO calls. the old OMAP-specfic ones should