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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> |
f6ffa5ee LW |
19 | |
20 | #define IOP3XX_N_GPIOS 8 | |
72edd84a | 21 | |
51a97d82 | 22 | static void gpio_line_config(int line, int direction) |
72edd84a LB |
23 | { |
24 | unsigned long flags; | |
25 | ||
26 | local_irq_save(flags); | |
27 | if (direction == GPIO_IN) { | |
28 | *IOP3XX_GPOE |= 1 << line; | |
29 | } else if (direction == GPIO_OUT) { | |
30 | *IOP3XX_GPOE &= ~(1 << line); | |
31 | } | |
32 | local_irq_restore(flags); | |
33 | } | |
72edd84a | 34 | |
51a97d82 | 35 | static int gpio_line_get(int line) |
72edd84a LB |
36 | { |
37 | return !!(*IOP3XX_GPID & (1 << line)); | |
38 | } | |
72edd84a | 39 | |
51a97d82 | 40 | static void gpio_line_set(int line, int value) |
72edd84a LB |
41 | { |
42 | unsigned long flags; | |
43 | ||
44 | local_irq_save(flags); | |
45 | if (value == GPIO_LOW) { | |
46 | *IOP3XX_GPOD &= ~(1 << line); | |
47 | } else if (value == GPIO_HIGH) { | |
48 | *IOP3XX_GPOD |= 1 << line; | |
49 | } | |
50 | local_irq_restore(flags); | |
51 | } | |
63f385cd AP |
52 | |
53 | static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) | |
54 | { | |
55 | gpio_line_config(gpio, GPIO_IN); | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level) | |
60 | { | |
61 | gpio_line_set(gpio, level); | |
62 | gpio_line_config(gpio, GPIO_OUT); | |
63 | return 0; | |
64 | } | |
65 | ||
66 | static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio) | |
67 | { | |
68 | return gpio_line_get(gpio); | |
69 | } | |
70 | ||
71 | static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) | |
72 | { | |
73 | gpio_line_set(gpio, value); | |
74 | } | |
75 | ||
76 | static struct gpio_chip iop3xx_chip = { | |
77 | .label = "iop3xx", | |
78 | .direction_input = iop3xx_gpio_direction_input, | |
79 | .get = iop3xx_gpio_get_value, | |
80 | .direction_output = iop3xx_gpio_direction_output, | |
81 | .set = iop3xx_gpio_set_value, | |
82 | .base = 0, | |
83 | .ngpio = IOP3XX_N_GPIOS, | |
84 | }; | |
85 | ||
86 | static int __init iop3xx_gpio_setup(void) | |
87 | { | |
88 | return gpiochip_add(&iop3xx_chip); | |
89 | } | |
90 | arch_initcall(iop3xx_gpio_setup); |