blob: 8ea3b33d4b40bb4b96ad7edd83f6dac7e219aa03 [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 */
Russell King2f8163b2011-07-26 10:53:52 +010010#include <linux/gpio.h>
Dmitry Baryshkov45528e32008-04-10 13:31:47 +010011#include <linux/init.h>
12#include <linux/module.h>
13
Russell Kinga09e64f2008-08-05 16:14:15 +010014#include <mach/hardware.h>
Rob Herringf314f332012-02-24 00:06:51 +010015#include <mach/irqs.h>
Dmitry Baryshkov45528e32008-04-10 13:31:47 +010016
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
Russell Kingf408c982011-12-18 18:24:57 +000051static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
52{
53 return offset < 11 ? (IRQ_GPIO0 + offset) : (IRQ_GPIO11 - 11 + offset);
54}
55
Dmitry Baryshkov45528e32008-04-10 13:31:47 +010056static 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,
Russell Kingf408c982011-12-18 18:24:57 +000062 .to_irq = sa1100_to_irq,
Dmitry Baryshkov45528e32008-04-10 13:31:47 +010063 .base = 0,
64 .ngpio = GPIO_MAX + 1,
65};
66
67void __init sa1100_init_gpio(void)
68{
69 gpiochip_add(&sa1100_gpio_chip);
70}