projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| c197da91 AP |
1 | /* |
| 2 | * STLS2F GPIO Support | |
| 3 | * | |
| 70342287 | 4 | * Copyright (c) 2008 Richard Liu, STMicroelectronics <richard.liu@st.com> |
| c197da91 AP |
5 | * Copyright (c) 2008-2010 Arnaud Patard <apatard@mandriva.com> |
| 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 | |
| 10 | * (at your option) any later version. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/kernel.h> | |
| 14 | #include <linux/init.h> | |
| 15 | #include <linux/module.h> | |
| 16 | #include <linux/spinlock.h> | |
| 17 | #include <linux/err.h> | |
| 18 | #include <asm/types.h> | |
| 19 | #include <loongson.h> | |
| 20 | #include <linux/gpio.h> | |
| 21 | ||
| 22 | #define STLS2F_N_GPIO 4 | |
| 23 | #define STLS2F_GPIO_IN_OFFSET 16 | |
| 24 | ||
| 25 | static DEFINE_SPINLOCK(gpio_lock); | |
| 26 | ||
| c197da91 AP |
27 | static int ls2f_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) |
| 28 | { | |
| 29 | u32 temp; | |
| 30 | u32 mask; | |
| 31 | ||
| c197da91 AP |
32 | spin_lock(&gpio_lock); |
| 33 | mask = 1 << gpio; | |
| 34 | temp = LOONGSON_GPIOIE; | |
| 35 | temp |= mask; | |
| 36 | LOONGSON_GPIOIE = temp; | |
| 37 | spin_unlock(&gpio_lock); | |
| 38 | ||
| 39 | return 0; | |
| 40 | } | |
| 41 | ||
| 42 | static int ls2f_gpio_direction_output(struct gpio_chip *chip, | |
| 43 | unsigned gpio, int level) | |
| 44 | { | |
| 45 | u32 temp; | |
| 46 | u32 mask; | |
| 47 | ||
| c197da91 AP |
48 | gpio_set_value(gpio, level); |
| 49 | spin_lock(&gpio_lock); | |
| 50 | mask = 1 << gpio; | |
| 51 | temp = LOONGSON_GPIOIE; | |
| 52 | temp &= (~mask); | |
| 53 | LOONGSON_GPIOIE = temp; | |
| 54 | spin_unlock(&gpio_lock); | |
| 55 | ||
| 56 | return 0; | |
| 57 | } | |
| 58 | ||
| 59 | static int ls2f_gpio_get_value(struct gpio_chip *chip, unsigned gpio) | |
| 60 | { | |
| df5dade4 HC |
61 | u32 val; |
| 62 | u32 mask; | |
| 63 | ||
| 64 | mask = 1 << (gpio + STLS2F_GPIO_IN_OFFSET); | |
| 65 | spin_lock(&gpio_lock); | |
| 66 | val = LOONGSON_GPIODATA; | |
| 67 | spin_unlock(&gpio_lock); | |
| 68 | ||
| 69 | return (val & mask) != 0; | |
| c197da91 AP |
70 | } |
| 71 | ||
| 72 | static void ls2f_gpio_set_value(struct gpio_chip *chip, | |
| 73 | unsigned gpio, int value) | |
| 74 | { | |
| df5dade4 HC |
75 | u32 val; |
| 76 | u32 mask; | |
| 77 | ||
| 78 | mask = 1 << gpio; | |
| 79 | ||
| 80 | spin_lock(&gpio_lock); | |
| 81 | val = LOONGSON_GPIODATA; | |
| 82 | if (value) | |
| 83 | val |= mask; | |
| 84 | else | |
| 85 | val &= (~mask); | |
| 86 | LOONGSON_GPIODATA = val; | |
| 87 | spin_unlock(&gpio_lock); | |
| c197da91 AP |
88 | } |
| 89 | ||
| 90 | static struct gpio_chip ls2f_chip = { | |
| 70342287 RB |
91 | .label = "ls2f", |
| 92 | .direction_input = ls2f_gpio_direction_input, | |
| 93 | .get = ls2f_gpio_get_value, | |
| 94 | .direction_output = ls2f_gpio_direction_output, | |
| 95 | .set = ls2f_gpio_set_value, | |
| 96 | .base = 0, | |
| 97 | .ngpio = STLS2F_N_GPIO, | |
| df5dade4 | 98 | .can_sleep = false, |
| c197da91 AP |
99 | }; |
| 100 | ||
| 101 | static int __init ls2f_gpio_setup(void) | |
| 102 | { | |
| 103 | return gpiochip_add(&ls2f_chip); | |
| 104 | } | |
| 105 | arch_initcall(ls2f_gpio_setup); |