LXR linux/arch/arm/mach-sa1100/gpio.c

   1/*
   2 * linux/arch/arm/mach-sa1100/gpio.c
   3 *
   4 * Generic SA-1100 GPIO handling
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#include <linux/init.h>
  12#include <linux/module.h>
  13
  14#include <asm/gpio.h>
  15#include <mach/hardware.h>
  16#include "generic.h"
  17
  18static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
  19{
  20        return GPLR & GPIO_GPIO(offset);
  21}
  22
  23static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
  24{
  25        if (value)
  26                GPSR = GPIO_GPIO(offset);
  27        else
  28                GPCR = GPIO_GPIO(offset);
  29}
  30
  31static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
  32{
  33        unsigned long flags;
  34
  35        local_irq_save(flags);
  36        GPDR &= ~GPIO_GPIO(offset);
  37        local_irq_restore(flags);
  38        return 0;
  39}
  40
  41static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
  42{
  43        unsigned long flags;
  44
  45        local_irq_save(flags);
  46        sa1100_gpio_set(chip, offset, value);
  47        GPDR |= GPIO_GPIO(offset);
  48        local_irq_restore(flags);
  49        return 0;
  50}
  51
  52static struct gpio_chip sa1100_gpio_chip = {
  53        .label                  = "gpio",
  54        .direction_input        = sa1100_direction_input,
  55        .direction_output       = sa1100_direction_output,
  56        .set                    = sa1100_gpio_set,
  57        .get                    = sa1100_gpio_get,
  58        .base                   = 0,
  59        .ngpio                  = GPIO_MAX + 1,
  60};
  61
  62void __init sa1100_init_gpio(void)
  63{
  64        gpiochip_add(&sa1100_gpio_chip);
  65}
  66