1 #include <linux/autoconf.h>
2 #include <linux/module.h>
3 #include <linux/types.h>
4 #include <linux/miscdevice.h>
5 #include <linux/watchdog.h>
7 #include <linux/jiffies.h>
8 #include <linux/timer.h>
11 #include <asm/uaccess.h>
12 #include <asm/system.h>
13 #include <asm/bootinfo.h>
15 extern unsigned long mips_machtype;
17 static unsigned long wdt_is_open;
18 static struct timer_list wdt_timer;
20 static void wdt_merlot_refresh(void)
23 switch (mips_machtype) {
25 wdt = (__u32 *) 0xb8030034;
29 wdt = (__u32 *) 0xbc00300c;
35 static void wdt_merlot_timer_fn(unsigned long data)
38 if (!test_bit(1, &wdt_is_open))
39 mod_timer(&wdt_timer, jiffies + HZ);
42 static int wdt_merlot_setup_timer(void)
45 init_timer(&wdt_timer);
46 wdt_timer.function = wdt_merlot_timer_fn;
48 wdt_timer.expires = jiffies + HZ;
49 add_timer(&wdt_timer);
53 static int wdt_open(struct inode *inode, struct file *file)
55 if (test_and_set_bit(0, &wdt_is_open))
57 set_bit(1, &wdt_is_open);
58 return nonseekable_open(inode, file);
61 static ssize_t wdt_write(struct file *file, const char __user * buf, size_t count, loff_t * ppos)
63 if (count) /* something was written */
68 static int wdt_release(struct inode *inode, struct file *file)
70 clear_bit(0, &wdt_is_open);
74 static struct file_operations wdt_fops = {
79 .release = wdt_release,
82 static struct miscdevice wdt_miscdev = {
83 .minor = WATCHDOG_MINOR,
88 static void __exit wdt_exit(void)
90 misc_deregister(&wdt_miscdev);
93 static int __init wdt_init(void)
96 ret = misc_register(&wdt_miscdev);
99 "wdt: cannot register miscdev on minor=%d (err=%d)\n",
100 WATCHDOG_MINOR, ret);
101 misc_deregister(&wdt_miscdev);
104 printk("wdt: registered with refresh\n");
105 wdt_merlot_refresh();
106 wdt_merlot_setup_timer();
111 module_init(wdt_init);
112 module_exit(wdt_exit);