gpio-sa1100.c

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

#include <mach/hardware.h>
#include <mach/irqs.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 int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
{
    return offset < 11 ? (IRQ_GPIO0 + offset) : (IRQ_GPIO11 - 11 + offset);
}

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,
    .to_irq         = sa1100_to_irq,
    .base           = 0,
    .ngpio          = GPIO_MAX + 1,
};

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