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gpio.c

/*
 * linux/arch/arm/mach-sa1100/gpio.c
 *
 * Generic SA-1100 GPIO handling
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/module.h>

#include <asm/gpio.h>
#include <mach/hardware.h>
#include "generic.h"

static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
{
      return GPLR & GPIO_GPIO(offset);
}

static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
      if (value)
            GPSR = GPIO_GPIO(offset);
      else
            GPCR = GPIO_GPIO(offset);
}

static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
{
      unsigned long flags;

      local_irq_save(flags);
      GPDR &= ~GPIO_GPIO(offset);
      local_irq_restore(flags);
      return 0;
}

static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
{
      unsigned long flags;

      local_irq_save(flags);
      sa1100_gpio_set(chip, offset, value);
      GPDR |= GPIO_GPIO(offset);
      local_irq_restore(flags);
      return 0;
}

static struct gpio_chip sa1100_gpio_chip = {
      .label                  = "gpio",
      .direction_input  = sa1100_direction_input,
      .direction_output = sa1100_direction_output,
      .set              = sa1100_gpio_set,
      .get              = sa1100_gpio_get,
      .base             = 0,
      .ngpio                  = GPIO_MAX + 1,
};

void __init sa1100_init_gpio(void)
{
      gpiochip_add(&sa1100_gpio_chip);
}

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