2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
17 * Based on EP93xx wdt driver
20 #include <linux/module.h>
22 #include <linux/miscdevice.h>
23 #include <linux/miscdevice.h>
24 #include <linux/watchdog.h>
25 #include <linux/platform_device.h>
26 #include <asm/uaccess.h>
27 #include <asm-mips/ifxmips/ifxmips_cgu.h>
28 #include <asm-mips/ifxmips/ifxmips.h>
30 #define IFXMIPS_WDT_PW1 0x00BE0000
31 #define IFXMIPS_WDT_PW2 0x00DC0000
33 #ifndef CONFIG_WATCHDOG_NOWAYOUT
34 static int wdt_ok_to_close = 0;
40 ifxmips_wdt_enable(unsigned int timeout)
43 fpi = cgu_get_io_region_clock();
44 ifxmips_w32(IFXMIPS_WDT_PW1, IFXMIPS_BIU_WDT_CR);
45 ifxmips_w32(IFXMIPS_WDT_PW2 |
47 (0x3 << 24) | // CLKDIV
48 (0x1 << 31) | // enable
49 ((timeout * (fpi / 0x40000)) + 0x1000), // reload
55 ifxmips_wdt_disable(void)
57 #ifndef CONFIG_WATCHDOG_NOWAYOUT
60 ifxmips_w32(IFXMIPS_WDT_PW1, IFXMIPS_BIU_WDT_CR);
61 ifxmips_w32(IFXMIPS_WDT_PW2, IFXMIPS_BIU_WDT_CR);
65 ifxmips_wdt_write(struct file *file, const char __user *data, size_t len,
73 #ifndef CONFIG_WATCHDOG_NOWAYOUT
74 for(i = 0; i != len; i++)
77 if(get_user(c, data + i))
83 ifxmips_wdt_enable(wdt_timeout);
87 static struct watchdog_info ident = {
88 .options = WDIOF_MAGICCLOSE,
89 .identity = "ifxmips Watchdog",
93 ifxmips_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
100 case WDIOC_GETSUPPORT:
101 ret = copy_to_user((struct watchdog_info __user *)arg, &ident,
102 sizeof(ident)) ? -EFAULT : 0;
105 case WDIOC_GETTIMEOUT:
106 ret = put_user(wdt_timeout, (int __user *)arg);
109 case WDIOC_SETTIMEOUT:
110 ret = get_user(wdt_timeout, (int __user*)arg);
113 case WDIOC_KEEPALIVE:
114 ifxmips_wdt_enable(wdt_timeout);
122 ifxmips_wdt_open(struct inode *inode, struct file *file)
124 ifxmips_wdt_enable(wdt_timeout);
125 printk("ifxmips_wdt: activated");
126 return nonseekable_open(inode, file);
129 static int ifxmips_wdt_release(struct inode *inode, struct file *file)
131 #ifndef CONFIG_WATCHDOG_NOWAYOUT
133 ifxmips_wdt_disable();
136 printk("ifxmips_wdt: watchdog closed without warning, rebooting system\n");
140 static const struct file_operations ifxmips_wdt_fops = {
141 .owner = THIS_MODULE,
142 .write = ifxmips_wdt_write,
143 .ioctl = ifxmips_wdt_ioctl,
144 .open = ifxmips_wdt_open,
145 .release = ifxmips_wdt_release,
148 static struct miscdevice ifxmips_wdt_miscdev = {
149 .minor = WATCHDOG_MINOR,
151 .fops = &ifxmips_wdt_fops,
155 ifxmips_wdt_probe(struct platform_device *dev)
158 err = misc_register(&ifxmips_wdt_miscdev);
160 printk("ifxmips_wdt: error creating device\n");
162 printk("ifxmips_wdt: loaded\n");
167 ifxmips_wdt_remove(struct platform_device *dev)
169 ifxmips_wdt_disable();
170 misc_deregister(&ifxmips_wdt_miscdev);
175 static struct platform_driver ifxmips_wdt_driver = {
176 .probe = ifxmips_wdt_probe,
177 .remove = ifxmips_wdt_remove,
179 .name = "ifxmips_wdt",
180 .owner = THIS_MODULE,
185 init_ifxmips_wdt(void)
187 int ret = platform_driver_register(&ifxmips_wdt_driver);
189 printk(KERN_INFO "ifxmips_wdt: error registering platfom driver!");
194 exit_ifxmips_wdt(void)
196 platform_driver_unregister(&ifxmips_wdt_driver);
199 module_init(init_ifxmips_wdt);
200 module_exit(exit_ifxmips_wdt);
202 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
203 MODULE_DESCRIPTION("ifxmips Watchdog");
204 MODULE_LICENSE("GPL");
205 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);