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path: root/drivers/gpio/gpio-sa1100.c
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Diffstat (limited to 'drivers/gpio/gpio-sa1100.c')
-rw-r--r--drivers/gpio/gpio-sa1100.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-sa1100.c b/drivers/gpio/gpio-sa1100.c
new file mode 100644
index 000000000000..b6c1f6d80649
--- /dev/null
+++ b/drivers/gpio/gpio-sa1100.c
@@ -0,0 +1,63 @@
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
16static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
17{
18 return GPLR & GPIO_GPIO(offset);
19}
20
21static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
22{
23 if (value)
24 GPSR = GPIO_GPIO(offset);
25 else
26 GPCR = GPIO_GPIO(offset);
27}
28
29static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
30{
31 unsigned long flags;
32
33 local_irq_save(flags);
34 GPDR &= ~GPIO_GPIO(offset);
35 local_irq_restore(flags);
36 return 0;
37}
38
39static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
40{
41 unsigned long flags;
42
43 local_irq_save(flags);
44 sa1100_gpio_set(chip, offset, value);
45 GPDR |= GPIO_GPIO(offset);
46 local_irq_restore(flags);
47 return 0;
48}
49
50static struct gpio_chip sa1100_gpio_chip = {
51 .label = "gpio",
52 .direction_input = sa1100_direction_input,
53 .direction_output = sa1100_direction_output,
54 .set = sa1100_gpio_set,
55 .get = sa1100_gpio_get,
56 .base = 0,
57 .ngpio = GPIO_MAX + 1,
58};
59
60void __init sa1100_init_gpio(void)
61{
62 gpiochip_add(&sa1100_gpio_chip);
63}