+++ /dev/null
-/*
- * 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);
-
projects / openwrt / staging / chunkeey.git / blobdiff