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Commit a3484ffd authored by Dinh Nguyen's avatar Dinh Nguyen Committed by Sascha Hauer
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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: default avatarDinh Nguyen <Dinh.Nguyen@freescale.com>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
parent f2d36ecb

arch/arm/plat-mxc/gpio.c

+32 −0
Original line number Diff line number Diff line
@@ -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,