blob: 0d3829a8c2c1df94cd2e8ceb3ef8aa751291a336 [file] [log] [blame]
Dmitry Baryshkov45528e32008-04-10 13:31:47 +01001/*
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>
Russell Kinga09e64f2008-08-05 16:14:15 +010015#include <mach/hardware.h>
Dmitry Baryshkov45528e32008-04-10 13:31:47 +010016#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}