linux/drivers/gpio/gpio-sa1100.c
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   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#include <linux/gpio.h>
  11#include <linux/init.h>
  12#include <linux/module.h>
  13
  14#include <mach/hardware.h>
  15#include <mach/irqs.h>
  16
  17static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
  18{
  19        return GPLR & GPIO_GPIO(offset);
  20}
  21
  22static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
  23{
  24        if (value)
  25                GPSR = GPIO_GPIO(offset);
  26        else
  27                GPCR = GPIO_GPIO(offset);
  28}
  29
  30static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
  31{
  32        unsigned long flags;
  33
  34        local_irq_save(flags);
  35        GPDR &= ~GPIO_GPIO(offset);
  36        local_irq_restore(flags);
  37        return 0;
  38}
  39
  40static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
  41{
  42        unsigned long flags;
  43
  44        local_irq_save(flags);
  45        sa1100_gpio_set(chip, offset, value);
  46        GPDR |= GPIO_GPIO(offset);
  47        local_irq_restore(flags);
  48        return 0;
  49}
  50
  51static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
  52{
  53        return offset < 11 ? (IRQ_GPIO0 + offset) : (IRQ_GPIO11 - 11 + offset);
  54}
  55
  56static struct gpio_chip sa1100_gpio_chip = {
  57        .label                  = "gpio",
  58        .direction_input        = sa1100_direction_input,
  59        .direction_output       = sa1100_direction_output,
  60        .set                    = sa1100_gpio_set,
  61        .get                    = sa1100_gpio_get,
  62        .to_irq                 = sa1100_to_irq,
  63        .base                   = 0,
  64        .ngpio                  = GPIO_MAX + 1,
  65};
  66
  67void __init sa1100_init_gpio(void)
  68{
  69        gpiochip_add(&sa1100_gpio_chip);
  70}
  71
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