+++ /dev/null
-/*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
- * Based on EP93xx wdt driver
- */
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/miscdevice.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/platform_device.h>
-#include <linux/uaccess.h>
-
-#include <ifxmips.h>
-#include <ifxmips_cgu.h>
-
-#define IFXMIPS_WDT_PW1 0x00BE0000
-#define IFXMIPS_WDT_PW2 0x00DC0000
-
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
-static int wdt_ok_to_close;
-#endif
-
-static int wdt_timeout = 30;
-
-int ifxmips_wdt_enable(unsigned int timeout)
-{
- u32 fpi;
- fpi = cgu_get_io_region_clock();
- ifxmips_w32(IFXMIPS_WDT_PW1, IFXMIPS_BIU_WDT_CR);
- ifxmips_w32(IFXMIPS_WDT_PW2 |
- (0x3 << 26) | /* PWL */
- (0x3 << 24) | /* CLKDIV */
- (0x1 << 31) | /* enable */
- ((timeout * (fpi / 0x40000)) + 0x1000), /* reload */
- IFXMIPS_BIU_WDT_CR);
- return 0;
-}
-
-void ifxmips_wdt_disable(void)
-{
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- wdt_ok_to_close = 0;
-#endif
- ifxmips_w32(IFXMIPS_WDT_PW1, IFXMIPS_BIU_WDT_CR);
- ifxmips_w32(IFXMIPS_WDT_PW2, IFXMIPS_BIU_WDT_CR);
-}
-
-static ssize_t ifxmips_wdt_write(struct file *file, const char __user *data,
- size_t len, loff_t *ppos)
-{
- size_t i;
-
- if (!len)
- return 0;
-
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- for (i = 0; i != len; i++) {
- char c;
- if (get_user(c, data + i))
- return -EFAULT;
- if (c == 'V')
- wdt_ok_to_close = 1;
- }
-#endif
- ifxmips_wdt_enable(wdt_timeout);
- return len;
-}
-
-static struct watchdog_info ident = {
- .options = WDIOF_MAGICCLOSE,
- .identity = "ifxmips Watchdog",
-};
-
-static int ifxmips_wdt_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- int ret = -ENOTTY;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- ret = copy_to_user((struct watchdog_info __user *)arg, &ident,
- sizeof(ident)) ? -EFAULT : 0;
- break;
-
- case WDIOC_GETTIMEOUT:
- ret = put_user(wdt_timeout, (int __user *)arg);
- break;
-
- case WDIOC_SETTIMEOUT:
- ret = get_user(wdt_timeout, (int __user *)arg);
- break;
-
- case WDIOC_KEEPALIVE:
- ifxmips_wdt_enable(wdt_timeout);
- ret = 0;
- break;
- }
- return ret;
-}
-
-static int ifxmips_wdt_open(struct inode *inode, struct file *file)
-{
- ifxmips_wdt_enable(wdt_timeout);
- return nonseekable_open(inode, file);
-}
-
-static int ifxmips_wdt_release(struct inode *inode, struct file *file)
-{
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- if (wdt_ok_to_close)
- ifxmips_wdt_disable();
- else
-#endif
- printk(KERN_ERR "ifxmips_wdt: watchdog closed without warning,"
- " rebooting system\n");
- return 0;
-}
-
-static const struct file_operations ifxmips_wdt_fops = {
- .owner = THIS_MODULE,
- .write = ifxmips_wdt_write,
- .ioctl = ifxmips_wdt_ioctl,
- .open = ifxmips_wdt_open,
- .release = ifxmips_wdt_release,
-};
-
-static struct miscdevice ifxmips_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &ifxmips_wdt_fops,
-};
-
-static int ifxmips_wdt_probe(struct platform_device *dev)
-{
- int err;
- err = misc_register(&ifxmips_wdt_miscdev);
- if (err)
- printk(KERN_INFO "ifxmips_wdt: error creating device\n");
- else
- printk(KERN_INFO "ifxmips_wdt: loaded\n");
- return err;
-}
-
-static int ifxmips_wdt_remove(struct platform_device *dev)
-{
- ifxmips_wdt_disable();
- misc_deregister(&ifxmips_wdt_miscdev);
- return 0;
-}
-
-
-static struct platform_driver ifxmips_wdt_driver = {
- .probe = ifxmips_wdt_probe,
- .remove = ifxmips_wdt_remove,
- .driver = {
- .name = "ifxmips_wdt",
- .owner = THIS_MODULE,
- },
-};
-
-static int __init init_ifxmips_wdt(void)
-{
- int ret = platform_driver_register(&ifxmips_wdt_driver);
- if (ret)
- printk(KERN_INFO "ifxmips_wdt: error registering platfom driver!");
- return ret;
-}
-
-static void __exit exit_ifxmips_wdt(void)
-{
- platform_driver_unregister(&ifxmips_wdt_driver);
-}
-
-module_init(init_ifxmips_wdt);
-module_exit(exit_ifxmips_wdt);
-
-MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
-MODULE_DESCRIPTION("ifxmips Watchdog");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
projects / openwrt / svn-archive / archive.git / blobdiff