Remove reference to old ar7-2.4 code
[openwrt.git] / target / linux / brcm63xx-2.6 / files / arch / mips / bcm963xx / wdt.c
1 /*
2 * Watchdog driver for the BCM963xx devices
3 *
4 * Copyright (C) 2007 OpenWrt.org
5 * Florian Fainelli <florian@openwrt.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/errno.h>
16 #include <linux/miscdevice.h>
17 #include <linux/fs.h>
18 #include <linux/init.h>
19 #include <linux/notifier.h>
20 #include <linux/watchdog.h>
21 #include <linux/timer.h>
22 #include <linux/jiffies.h>
23 #include <linux/completion.h>
24 #include <linux/ioport.h>
25
26 typedef struct bcm963xx_timer {
27 unsigned short unused0;
28 unsigned char timer_mask;
29 #define TIMER0EN 0x01
30 #define TIMER1EN 0x02
31 #define TIMER2EN 0x04
32 unsigned char timer_ints;
33 #define TIMER0 0x01
34 #define TIMER1 0x02
35 #define TIMER2 0x04
36 #define WATCHDOG 0x08
37 unsigned long timer_ctl0;
38 unsigned long timer_ctl1;
39 unsigned long timer_ctl2;
40 #define TIMERENABLE 0x80000000
41 #define RSTCNTCLR 0x40000000
42 unsigned long timer_cnt0;
43 unsigned long timer_cnt1;
44 unsigned long timer_cnt2;
45 unsigned long wdt_def_count;
46
47 /* Write 0xff00 0x00ff to Start timer
48 * Write 0xee00 0x00ee to Stop and re-load default count
49 * Read from this register returns current watch dog count
50 */
51 unsigned long wdt_ctl;
52
53 /* Number of 40-MHz ticks for WD Reset pulse to last */
54 unsigned long wdt_rst_count;
55 } bcm963xx_timer;
56
57 static struct bcm963xx_wdt_device {
58 struct completion stop;
59 volatile int running;
60 struct timer_list timer;
61 volatile int queue;
62 int default_ticks;
63 unsigned long inuse;
64 } bcm963xx_wdt_device;
65
66 static int ticks = 1000;
67
68 #define WDT_BASE 0xfffe0200
69 #define WDT ((volatile bcm963xx_timer * const) WDT_BASE)
70
71 #define BCM963XX_INTERVAL (HZ/10+1)
72
73 static void bcm963xx_wdt_trigger(unsigned long unused)
74 {
75 if (bcm963xx_wdt_device.running)
76 ticks--;
77
78 /* Load the default ticking value into the reset counter register */
79 WDT->wdt_rst_count = bcm963xx_wdt_device.default_ticks;
80
81 if (bcm963xx_wdt_device.queue && ticks) {
82 bcm963xx_wdt_device.timer.expires = jiffies + BCM963XX_INTERVAL;
83 add_timer(&bcm963xx_wdt_device.timer);
84 }
85 else {
86 complete(&bcm963xx_wdt_device.stop);
87 }
88 }
89
90 static void bcm963xx_wdt_reset(void)
91 {
92 ticks = bcm963xx_wdt_device.default_ticks;
93 /* Also reload default count */
94 WDT->wdt_def_count = ticks;
95 WDT->wdt_ctl = 0xee00;
96 WDT->wdt_ctl = 0x00ee;
97 }
98
99 static void bcm963xx_wdt_start(void)
100 {
101 if (!bcm963xx_wdt_device.queue) {
102 bcm963xx_wdt_device.queue;
103 /* Enable the watchdog by writing 0xff00 ,then 0x00ff to the control register */
104 WDT->wdt_ctl = 0xff00;
105 WDT->wdt_ctl = 0x00ff;
106 bcm963xx_wdt_device.timer.expires = jiffies + BCM963XX_INTERVAL;
107 add_timer(&bcm963xx_wdt_device.timer);
108 }
109 bcm963xx_wdt_device.running++;
110 }
111
112 static int bcm963xx_wdt_stop(void)
113 {
114 if (bcm963xx_wdt_device.running)
115 bcm963xx_wdt_device.running = 0;
116
117 ticks = bcm963xx_wdt_device.default_ticks;
118
119 /* Stop the watchdog by writing 0xee00 then 0x00ee to the control register */
120 WDT->wdt_ctl = 0xee00;
121 WDT->wdt_ctl = 0x00ee;
122
123 return -EIO;
124 }
125
126 static int bcm963xx_wdt_open(struct inode *inode, struct file *file)
127 {
128 if (test_and_set_bit(0, &bcm963xx_wdt_device.inuse))
129 return -EBUSY;
130 return nonseekable_open(inode, file);
131 }
132
133 static int bcm963xx_wdt_release(struct inode *inode, struct file *file)
134 {
135 clear_bit(0, &bcm963xx_wdt_device.inuse);
136 return 0;
137 }
138
139 static int bcm963xx_wdt_ioctl(struct inode *inode, struct file *file,
140 unsigned int cmd, unsigned long arg)
141 {
142 void __user *argp = (void __user *)arg;
143 unsigned int value;
144
145 static struct watchdog_info ident = {
146 .options = WDIOF_CARDRESET,
147 .identity = "BCM963xx WDT",
148 };
149
150 switch (cmd) {
151 case WDIOC_KEEPALIVE:
152 bcm963xx_wdt_reset();
153 break;
154 case WDIOC_GETSTATUS:
155 /* Reading from the control register will return the current value */
156 value = WDT->wdt_ctl;
157 if ( copy_to_user(argp, &value, sizeof(int)) )
158 return -EFAULT;
159 break;
160 case WDIOC_GETSUPPORT:
161 if ( copy_to_user(argp, &ident, sizeof(ident)) )
162 return -EFAULT;
163 break;
164 case WDIOC_SETOPTIONS:
165 if ( copy_from_user(&value, argp, sizeof(int)) )
166 return -EFAULT;
167 switch(value) {
168 case WDIOS_ENABLECARD:
169 bcm963xx_wdt_start();
170 break;
171 case WDIOS_DISABLECARD:
172 bcm963xx_wdt_stop();
173 break;
174 default:
175 return -EINVAL;
176 }
177 break;
178 default:
179 return -ENOTTY;
180 }
181 return 0;
182 }
183
184 static int bcm963xx_wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
185 {
186 if (!count)
187 return -EIO;
188 bcm963xx_wdt_reset();
189 return count;
190 }
191
192 static const struct file_operations bcm963xx_wdt_fops = {
193 .owner = THIS_MODULE,
194 .llseek = no_llseek,
195 .write = bcm963xx_wdt_write,
196 .ioctl = bcm963xx_wdt_ioctl,
197 .open = bcm963xx_wdt_open,
198 .release = bcm963xx_wdt_release,
199 };
200
201 static struct miscdevice bcm963xx_wdt_miscdev = {
202 .minor = WATCHDOG_MINOR,
203 .name = "watchdog",
204 .fops = &bcm963xx_wdt_fops,
205 };
206
207 static void __exit bcm963xx_wdt_exit(void)
208 {
209 if (bcm963xx_wdt_device.queue ){
210 bcm963xx_wdt_device.queue = 0;
211 wait_for_completion(&bcm963xx_wdt_device.stop);
212 }
213 misc_deregister(&bcm963xx_wdt_miscdev);
214 }
215
216 static int __init bcm963xx_wdt_init(void)
217 {
218 int ret = 0;
219
220 printk("Broadcom BCM963xx Watchdog timer\n");
221
222 ret = misc_register(&bcm963xx_wdt_miscdev);
223 if (ret) {
224 printk(KERN_CRIT "Cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, ret);
225 return ret;
226 }
227 init_completion(&bcm963xx_wdt_device.stop);
228 bcm963xx_wdt_device.queue = 0;
229
230 clear_bit(0, &bcm963xx_wdt_device.inuse);
231
232 init_timer(&bcm963xx_wdt_device.timer);
233 bcm963xx_wdt_device.timer.function = bcm963xx_wdt_trigger;
234 bcm963xx_wdt_device.timer.data = 0;
235
236 bcm963xx_wdt_device.default_ticks = ticks;
237 return ret;
238 }
239
240
241 module_init(bcm963xx_wdt_init);
242 module_exit(bcm963xx_wdt_exit);
243
244 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
245 MODULE_DESCRIPTION("Broadcom BCM963xx Watchdog driver");
246 MODULE_LICENSE("GPL");
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