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72edd84a LB |
1 | /* |
2 | * arch/arm/plat-iop/gpio.c | |
3 | * GPIO handling for Intel IOP3xx processors. | |
4 | * | |
5 | * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or (at | |
10 | * your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/device.h> | |
63f385cd AP |
14 | #include <linux/init.h> |
15 | #include <linux/types.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/gpio.h> | |
dc28094b | 18 | #include <linux/export.h> |
72edd84a LB |
19 | #include <asm/hardware/iop3xx.h> |
20 | ||
21 | void gpio_line_config(int line, int direction) | |
22 | { | |
23 | unsigned long flags; | |
24 | ||
25 | local_irq_save(flags); | |
26 | if (direction == GPIO_IN) { | |
27 | *IOP3XX_GPOE |= 1 << line; | |
28 | } else if (direction == GPIO_OUT) { | |
29 | *IOP3XX_GPOE &= ~(1 << line); | |
30 | } | |
31 | local_irq_restore(flags); | |
32 | } | |
33 | EXPORT_SYMBOL(gpio_line_config); | |
34 | ||
35 | int gpio_line_get(int line) | |
36 | { | |
37 | return !!(*IOP3XX_GPID & (1 << line)); | |
38 | } | |
39 | EXPORT_SYMBOL(gpio_line_get); | |
40 | ||
41 | void gpio_line_set(int line, int value) | |
42 | { | |
43 | unsigned long flags; | |
44 | ||
45 | local_irq_save(flags); | |
46 | if (value == GPIO_LOW) { | |
47 | *IOP3XX_GPOD &= ~(1 << line); | |
48 | } else if (value == GPIO_HIGH) { | |
49 | *IOP3XX_GPOD |= 1 << line; | |
50 | } | |
51 | local_irq_restore(flags); | |
52 | } | |
53 | EXPORT_SYMBOL(gpio_line_set); | |
63f385cd AP |
54 | |
55 | static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) | |
56 | { | |
57 | gpio_line_config(gpio, GPIO_IN); | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level) | |
62 | { | |
63 | gpio_line_set(gpio, level); | |
64 | gpio_line_config(gpio, GPIO_OUT); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio) | |
69 | { | |
70 | return gpio_line_get(gpio); | |
71 | } | |
72 | ||
73 | static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) | |
74 | { | |
75 | gpio_line_set(gpio, value); | |
76 | } | |
77 | ||
78 | static struct gpio_chip iop3xx_chip = { | |
79 | .label = "iop3xx", | |
80 | .direction_input = iop3xx_gpio_direction_input, | |
81 | .get = iop3xx_gpio_get_value, | |
82 | .direction_output = iop3xx_gpio_direction_output, | |
83 | .set = iop3xx_gpio_set_value, | |
84 | .base = 0, | |
85 | .ngpio = IOP3XX_N_GPIOS, | |
86 | }; | |
87 | ||
88 | static int __init iop3xx_gpio_setup(void) | |
89 | { | |
90 | return gpiochip_add(&iop3xx_chip); | |
91 | } | |
92 | arch_initcall(iop3xx_gpio_setup); |