diff options
Diffstat (limited to 'arch/arm/plat-mxc/gpio.c')
| -rw-r--r-- | arch/arm/plat-mxc/gpio.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/arch/arm/plat-mxc/gpio.c b/arch/arm/plat-mxc/gpio.c index 57ec4a8..9c3e362 100644 --- a/arch/arm/plat-mxc/gpio.c +++ b/arch/arm/plat-mxc/gpio.c @@ -20,6 +20,7 @@ */ #include <linux/init.h> +#include <linux/interrupt.h> #include <linux/io.h> #include <linux/irq.h> #include <linux/gpio.h> @@ -201,11 +202,42 @@ static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc) } } +/* + * Set interrupt number "irq" in the GPIO as a wake-up source. + * While system is running, all registered GPIO interrupts need to have + * wake-up enabled. When system is suspended, only selected GPIO interrupts + * need to have wake-up enabled. + * @param irq interrupt source number + * @param enable enable as wake-up if equal to non-zero + * @return This function returns 0 on success. + */ +static int gpio_set_wake_irq(u32 irq, u32 enable) +{ + u32 gpio = irq_to_gpio(irq); + u32 gpio_idx = gpio & 0x1F; + struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32]; + + if (enable) { + if (port->irq_high && (gpio_idx >= 16)) + enable_irq_wake(port->irq_high); + else + enable_irq_wake(port->irq); + } else { + if (port->irq_high && (gpio_idx >= 16)) + disable_irq_wake(port->irq_high); + else + disable_irq_wake(port->irq); + } + + return 0; +} + static struct irq_chip gpio_irq_chip = { .ack = gpio_ack_irq, .mask = gpio_mask_irq, .unmask = gpio_unmask_irq, .set_type = gpio_set_irq_type, + .set_wake = gpio_set_wake_irq, }; static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset, @@ -235,7 +267,7 @@ static void mxc_gpio_set(struct gpio_chip *chip, unsigned offset, int value) unsigned long flags; spin_lock_irqsave(&port->lock, flags); - l = (__raw_readl(reg) & (~(1 << offset))) | (value << offset); + l = (__raw_readl(reg) & (~(1 << offset))) | (!!value << offset); __raw_writel(l, reg); spin_unlock_irqrestore(&port->lock, flags); } |
