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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 | |
17 | static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset) |
18 | { |
19 | return GPLR & GPIO_GPIO(offset); |
20 | } |
21 | |
22 | static 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 | |
30 | static 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 | |
40 | static 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 | |
51 | static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset) |
52 | { |
53 | return offset < 11 ? (IRQ_GPIO0 + offset) : (IRQ_GPIO11 - 11 + offset); |
54 | } |
55 | |
56 | static 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 | |
67 | void __init sa1100_init_gpio(void) |
68 | { |
69 | gpiochip_add(&sa1100_gpio_chip); |
70 | } |
71 |
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