OMAP support debouncing of gpio lines, implement
the method using gpiolib.
Signed-off-by: Felipe Balbi <[email protected]>
---
arch/arm/plat-omap/gpio.c | 46 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index 76a347b..f9cd64c 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -612,6 +612,38 @@ do { \
__raw_writel(l, base + reg); \
} while(0)
+static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio, int
value)
+{
+ void __iomem *reg = bank->base;
+ u32 val;
+ u32 l;
+
+ value &= 0xff;
+ l = 1 << get_gpio_index(gpio);
+
+ if (cpu_is_omap44xx())
+ reg += OMAP4_GPIO_DEBOUNCINGTIME;
+ else
+ reg += OMAP24XX_GPIO_DEBOUNCE_VAL;
+
+ __raw_writel(value, reg);
+
+ reg = bank->base;
+ if (cpu_is_omap44xx())
+ reg += OMAP4_GPIO_DEBOUNCENABLE;
+ else
+ reg += OMAP24XX_GPIO_DEBOUNCE_EN;
+
+ val = __raw_readl(reg);
+
+ if (value)
+ val |= l;
+ else
+ val &= ~l;
+
+ __raw_writel(val, reg);
+}
+
void omap_set_gpio_debounce(int gpio, int enable)
{
struct gpio_bank *bank;
@@ -1608,6 +1640,19 @@ static int gpio_output(struct gpio_chip *chip, unsigned
offset, int value)
return 0;
}
+static int gpio_debounce(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct gpio_bank *bank;
+ unsigned long flags;
+
+ bank = container_of(chip, struct gpio_bank, chip);
+ spin_lock_irqsave(&bank->lock, flags);
+ _set_gpio_debounce(bank, offset, value);
+ spin_unlock_irqrestore(&bank->lock, flags);
+
+ return 0;
+}
+
static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct gpio_bank *bank;
@@ -1860,6 +1905,7 @@ static int __init _omap_gpio_init(void)
bank->chip.direction_input = gpio_input;
bank->chip.get = gpio_get;
bank->chip.direction_output = gpio_output;
+ bank->chip.set_debounce = gpio_debounce;
bank->chip.set = gpio_set;
bank->chip.to_irq = gpio_2irq;
if (bank_is_mpuio(bank)) {
--
1.7.0.rc0.33.g7c3932
--
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