1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/*
* 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);
|
