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