From a3484ffd2acc196ca934369395fe9aac63ed1a47 Mon Sep 17 00:00:00 2001 From: Dinh Nguyen Date: Sat, 23 Oct 2010 09:12:48 -0500 Subject: ARM: imx: Add wake functionality to GPIO Add function definition for irq_chip.set_wake to enable GPIO to wake-up the system. This patch has been tested on a MX51 Babbage system that had suspend code implemented. The set_wake implementation is necessary for a GPIO to wake up a system from suspend. Signed-off-by: Dinh Nguyen Signed-off-by: Sascha Hauer --- arch/arm/plat-mxc/gpio.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'arch/arm/plat-mxc/gpio.c') diff --git a/arch/arm/plat-mxc/gpio.c b/arch/arm/plat-mxc/gpio.c index 9d38da077edb..9c3e36232b5b 100644 --- a/arch/arm/plat-mxc/gpio.c +++ b/arch/arm/plat-mxc/gpio.c @@ -20,6 +20,7 @@ */ #include +#include #include #include #include @@ -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, -- cgit v1.2.3