diff options
Diffstat (limited to 'package/kernel/avila-wdt/src/avila-wdt.c')
| -rw-r--r-- | package/kernel/avila-wdt/src/avila-wdt.c | 231 |
1 files changed, 0 insertions, 231 deletions
diff --git a/package/kernel/avila-wdt/src/avila-wdt.c b/package/kernel/avila-wdt/src/avila-wdt.c deleted file mode 100644 index 22a3d6c7ea..0000000000 --- a/package/kernel/avila-wdt/src/avila-wdt.c +++ /dev/null @@ -1,231 +0,0 @@ -/* - * avila-wdt.c - * Copyright (C) 2009 Felix Fietkau <nbd@nbd.name> - * - * based on: - * drivers/char/watchdog/ixp4xx_wdt.c - * - * Watchdog driver for Intel IXP4xx network processors - * - * Author: Deepak Saxena <dsaxena@plexity.net> - * - * Copyright 2004 (c) MontaVista, Software, Inc. - * Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu> - * - * This file is licensed under the terms of the GNU General Public - * License version 2. This program is licensed "as is" without any - * warranty of any kind, whether express or implied. - */ - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/jiffies.h> -#include <linux/timer.h> -#include <linux/fs.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/init.h> -#include <linux/bitops.h> -#include <linux/uaccess.h> -#include <mach/hardware.h> - -static int nowayout = WATCHDOG_NOWAYOUT; -static int heartbeat = 20; /* (secs) Default is 20 seconds */ -static unsigned long wdt_status; -static atomic_t wdt_counter; -struct timer_list wdt_timer; - -#define WDT_IN_USE 0 -#define WDT_OK_TO_CLOSE 1 -#define WDT_RUNNING 2 - -static void wdt_refresh(unsigned long data) -{ - if (test_bit(WDT_RUNNING, &wdt_status)) { - if (atomic_dec_and_test(&wdt_counter)) { - printk(KERN_WARNING "Avila watchdog expired, expect a reboot soon!\n"); - clear_bit(WDT_RUNNING, &wdt_status); - return; - } - } - - /* strobe to the watchdog */ - gpio_line_set(14, IXP4XX_GPIO_HIGH); - gpio_line_set(14, IXP4XX_GPIO_LOW); - - mod_timer(&wdt_timer, jiffies + msecs_to_jiffies(500)); -} - -static void wdt_enable(void) -{ - atomic_set(&wdt_counter, heartbeat * 2); - - /* Disable clock generator output on GPIO 14/15 */ - *IXP4XX_GPIO_GPCLKR &= ~(1 << 8); - - /* activate GPIO 14 out */ - gpio_line_config(14, IXP4XX_GPIO_OUT); - gpio_line_set(14, IXP4XX_GPIO_LOW); - - if (!test_bit(WDT_RUNNING, &wdt_status)) - wdt_refresh(0); - set_bit(WDT_RUNNING, &wdt_status); -} - -static void wdt_disable(void) -{ - /* Re-enable clock generator output on GPIO 14/15 */ - *IXP4XX_GPIO_GPCLKR |= (1 << 8); -} - -static int avila_wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(WDT_IN_USE, &wdt_status)) - return -EBUSY; - - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - wdt_enable(); - return nonseekable_open(inode, file); -} - -static ssize_t -avila_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) -{ - if (len) { - if (!nowayout) { - size_t i; - - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - - for (i = 0; i != len; i++) { - char c; - - if (get_user(c, data + i)) - return -EFAULT; - if (c == 'V') - set_bit(WDT_OK_TO_CLOSE, &wdt_status); - } - } - wdt_enable(); - } - return len; -} - -static struct watchdog_info ident = { - .options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE | - WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, - .identity = "Avila Watchdog", -}; - - -static long avila_wdt_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - int ret = -ENOTTY; - int time; - - switch (cmd) { - case WDIOC_GETSUPPORT: - ret = copy_to_user((struct watchdog_info *)arg, &ident, - sizeof(ident)) ? -EFAULT : 0; - break; - - case WDIOC_GETSTATUS: - ret = put_user(0, (int *)arg); - break; - - case WDIOC_KEEPALIVE: - wdt_enable(); - ret = 0; - break; - - case WDIOC_SETTIMEOUT: - ret = get_user(time, (int *)arg); - if (ret) - break; - - if (time <= 0 || time > 60) { - ret = -EINVAL; - break; - } - - heartbeat = time; - wdt_enable(); - /* Fall through */ - - case WDIOC_GETTIMEOUT: - ret = put_user(heartbeat, (int *)arg); - break; - } - return ret; -} - -static int avila_wdt_release(struct inode *inode, struct file *file) -{ - if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) - wdt_disable(); - else - printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - " - "timer will not stop\n"); - clear_bit(WDT_IN_USE, &wdt_status); - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - - return 0; -} - - -static const struct file_operations avila_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = avila_wdt_write, - .unlocked_ioctl = avila_wdt_ioctl, - .open = avila_wdt_open, - .release = avila_wdt_release, -}; - -static struct miscdevice avila_wdt_miscdev = { - .minor = WATCHDOG_MINOR + 1, - .name = "avila_watchdog", - .fops = &avila_wdt_fops, -}; - -static int __init avila_wdt_init(void) -{ - int ret; - - init_timer(&wdt_timer); - wdt_timer.expires = 0; - wdt_timer.data = 0; - wdt_timer.function = wdt_refresh; - ret = misc_register(&avila_wdt_miscdev); - if (ret == 0) - printk(KERN_INFO "Avila Watchdog Timer: heartbeat %d sec\n", - heartbeat); - return ret; -} - -static void __exit avila_wdt_exit(void) -{ - misc_deregister(&avila_wdt_miscdev); - del_timer(&wdt_timer); - wdt_disable(); -} - - -module_init(avila_wdt_init); -module_exit(avila_wdt_exit); - -MODULE_AUTHOR("Felix Fietkau <nbd@nbd.name>"); -MODULE_DESCRIPTION("Gateworks Avila Hardware Watchdog"); - -module_param(heartbeat, int, 0); -MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 20s)"); - -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"); - -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); - |