projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 42a2478b MS |
1 | /* |
| 2 | * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> | |
| 3 | * Copyright (C) 2009 PetaLogix | |
| 4 | * | |
| 5 | * This file is subject to the terms and conditions of the GNU General Public | |
| 6 | * License. See the file "COPYING" in the main directory of this archive | |
| 7 | * for more details. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/init.h> | |
| 11 | #include <linux/of_platform.h> | |
| 12 | #include <asm/prom.h> | |
| 13 | ||
| 14 | /* Trigger specific functions */ | |
| 15 | #ifdef CONFIG_GPIOLIB | |
| 16 | ||
| 17 | #include <linux/of_gpio.h> | |
| 18 | ||
| 19 | static int handle; /* reset pin handle */ | |
| 67bf8766 | 20 | static unsigned int reset_val; |
| 42a2478b | 21 | |
| 42a2478b MS |
22 | void of_platform_reset_gpio_probe(void) |
| 23 | { | |
| 24 | int ret; | |
| fe9f6844 GL |
25 | handle = of_get_named_gpio(of_find_node_by_path("/"), |
| 26 | "hard-reset-gpios", 0); | |
| 42a2478b MS |
27 | |
| 28 | if (!gpio_is_valid(handle)) { | |
| 29 | printk(KERN_INFO "Skipping unavailable RESET gpio %d (%s)\n", | |
| 30 | handle, "reset"); | |
| 31 | } | |
| 32 | ||
| 33 | ret = gpio_request(handle, "reset"); | |
| 34 | if (ret < 0) { | |
| 35 | printk(KERN_INFO "GPIO pin is already allocated\n"); | |
| 36 | return; | |
| 37 | } | |
| 38 | ||
| 39 | /* get current setup value */ | |
| 67bf8766 | 40 | reset_val = gpio_get_value(handle); |
| 42a2478b | 41 | /* FIXME maybe worth to perform any action */ |
| 67bf8766 | 42 | pr_debug("Reset: Gpio output state: 0x%x\n", reset_val); |
| 42a2478b MS |
43 | |
| 44 | /* Setup GPIO as output */ | |
| 45 | ret = gpio_direction_output(handle, 0); | |
| 46 | if (ret < 0) | |
| 47 | goto err; | |
| 48 | ||
| 49 | /* Setup output direction */ | |
| 50 | gpio_set_value(handle, 0); | |
| 51 | ||
| 67bf8766 MS |
52 | printk(KERN_INFO "RESET: Registered gpio device: %d, current val: %d\n", |
| 53 | handle, reset_val); | |
| 42a2478b MS |
54 | return; |
| 55 | err: | |
| 56 | gpio_free(handle); | |
| 57 | return; | |
| 58 | } | |
| 59 | ||
| 60 | ||
| 61 | static void gpio_system_reset(void) | |
| 62 | { | |
| 67bf8766 | 63 | gpio_set_value(handle, 1 - reset_val); |
| 42a2478b MS |
64 | } |
| 65 | #else | |
| 66 | #define gpio_system_reset() do {} while (0) | |
| 67 | void of_platform_reset_gpio_probe(void) | |
| 68 | { | |
| 69 | return; | |
| 70 | } | |
| 71 | #endif | |
| 72 | ||
| 73 | void machine_restart(char *cmd) | |
| 74 | { | |
| 75 | printk(KERN_NOTICE "Machine restart...\n"); | |
| 76 | gpio_system_reset(); | |
| 77 | dump_stack(); | |
| 78 | while (1) | |
| 79 | ; | |
| 80 | } | |
| 81 | ||
| 82 | void machine_shutdown(void) | |
| 83 | { | |
| 84 | printk(KERN_NOTICE "Machine shutdown...\n"); | |
| 85 | while (1) | |
| 86 | ; | |
| 87 | } | |
| 88 | ||
| 89 | void machine_halt(void) | |
| 90 | { | |
| 91 | printk(KERN_NOTICE "Machine halt...\n"); | |
| 92 | while (1) | |
| 93 | ; | |
| 94 | } | |
| 95 | ||
| 96 | void machine_power_off(void) | |
| 97 | { | |
| 98 | printk(KERN_NOTICE "Machine power off...\n"); | |
| 99 | while (1) | |
| 100 | ; | |
| 101 | } |