summaryrefslogtreecommitdiff
path: root/target/linux/au1000-2.6/patches/004-mtx1_watchdog.patch
blob: c7e329b2950af81ea5316077048089b29e172e03 (plain)
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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
diff -urN linux-2.6.16.7/drivers/char/watchdog/Kconfig linux-2.6.16.7.new/drivers/char/watchdog/Kconfig
--- linux-2.6.16.7/drivers/char/watchdog/Kconfig	2006-04-17 23:53:25.000000000 +0200
+++ linux-2.6.16.7.new/drivers/char/watchdog/Kconfig	2006-04-22 23:23:53.000000000 +0200
@@ -460,6 +460,14 @@
 	  timer expired and no process has written to /dev/watchdog during
 	  that time.
 
+config MTX1_WATCHDOG
+	tristate "MTX-1 Hardware Watchdog"
+	depends on WATCHDOG && MIPS_MTX1
+	help
+	  Hardware driver for the AccessCube MTX-1 watchdog. This is a
+	  watchdog timer that will reboot the machine after a 100 seconds
+	  timer expired.
+
 # S390 Architecture
 
 config ZVM_WATCHDOG
diff -urN linux-2.6.16.7/drivers/char/watchdog/Makefile linux-2.6.16.7.new/drivers/char/watchdog/Makefile
--- linux-2.6.16.7/drivers/char/watchdog/Makefile	2006-04-17 23:53:25.000000000 +0200
+++ linux-2.6.16.7.new/drivers/char/watchdog/Makefile	2006-04-22 23:21:18.000000000 +0200
@@ -65,6 +65,7 @@
 
 # MIPS Architecture
 obj-$(CONFIG_INDYDOG) += indydog.o
+obj-$(CONFIG_MTX1_WATCHDOG) += mtx-1_watchdog.o
 
 # S390 Architecture
 
diff -urN linux-2.6.16.7/drivers/char/watchdog/mtx-1_watchdog.c linux-2.6.16.7.new/drivers/char/watchdog/mtx-1_watchdog.c
--- linux-2.6.16.7/drivers/char/watchdog/mtx-1_watchdog.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16.7.new/drivers/char/watchdog/mtx-1_watchdog.c	2006-04-22 23:20:53.000000000 +0200
@@ -0,0 +1,246 @@
+/*
+ *      Driver for the MTX-1 Watchdog.
+ *
+ *      (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.
+ *                              http://www.4g-systems.biz
+ *
+ *      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.
+ *
+ *      Neither Michael Stickel nor 4G Systems admit liability nor provide
+ *      warranty for any of this software. This material is provided
+ *      "AS-IS" and at no charge.
+ *
+ *      (c) Copyright 2005    4G Systems <info@4g-systems.biz>
+ *
+ *      Release 0.01.
+ *
+ *      Author: Michael Stickel  michael.stickel@4g-systems.biz
+ *
+ *
+ *      The Watchdog is configured to reset the MTX-1
+ *      if it is not triggered for 100 seconds.
+ *      It should not be triggered more often than 1.6 seconds.
+ *
+ *      A timer triggers the watchdog every 5 seconds, until
+ *      it is opened for the first time. After the first open
+ *      it MUST be triggered every 2..95 seconds.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <linux/fs.h>
+
+#include <asm/mach-au1x00/au1000.h>
+
+#ifndef FALSE
+# define FALSE (0)
+#endif
+
+#ifndef TRUE
+# define TRUE (!FALSE)
+#endif
+
+
+//---------[ Hardware Functions ]-----------------
+
+static void mtx1_trigger_wd (void)
+{
+	/*
+	 * toggle GPIO2_15
+	 */
+
+	u32 tmp = au_readl(GPIO2_DIR);
+	tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15));
+	au_writel (tmp, GPIO2_DIR);
+}
+
+static void mtx1_enable_wd (void)
+{
+	au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR);
+}
+
+static void mtx1_disable_wd (void)
+{
+	au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR);
+}
+
+
+//---------[ Timer Functions ]-----------------
+
+static struct timer_list   wd_trigger_timer;
+static char                timer_is_running = FALSE;
+
+static void wd_timer_callback (unsigned long data)
+{
+	if (timer_is_running)
+		mod_timer (&wd_trigger_timer, jiffies + 5 * HZ);
+	mtx1_trigger_wd();
+}
+
+static void start_wd_timer (void)
+{
+	if (!timer_is_running) {
+		struct timer_list *t = &wd_trigger_timer;
+		
+		init_timer (t);
+		t->function = wd_timer_callback;
+		t->data     = (unsigned long)0L;
+		t->expires  = jiffies + 5 * HZ;   // 5 seconds.
+		add_timer (t);
+		timer_is_running = TRUE;
+	}
+}
+
+
+
+static void stop_wd_timer (void)
+{
+	if (timer_is_running) {
+		del_timer(&wd_trigger_timer);
+		timer_is_running = FALSE;
+	}
+}
+
+
+//---------[ File Functions ]-----------------
+
+static char restart_after_close;
+
+static int mtx1wd_open (struct inode *inode, struct file *file)
+{
+	if (MINOR(inode->i_rdev) != WATCHDOG_MINOR) return -ENODEV;
+	//MOD_INC_USE_COUNT;
+
+	// stop the timer, if it is running. It will not be
+	// started again, until the module is loaded again.
+	stop_wd_timer();
+
+	// sleep for 2 seconds, to ensure, that the wd is
+	// not triggered more often than every 2 seconds.
+	schedule_timeout (2 * HZ);
+
+	return 0;
+}
+
+
+static int mtx1wd_release (struct inode *inode, struct file *file) {
+	if (MINOR(inode->i_rdev)==WATCHDOG_MINOR) {
+	}
+	if (restart_after_close)
+		start_wd_timer();
+	//MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+
+static ssize_t mtx1wd_write (struct file *file, const char *buf, size_t count, loff_t *ppos) {
+
+	mtx1_trigger_wd ();
+
+	if (count > 0) {
+               char buffer[10];
+               int n = (count>9)?9:count;
+
+               if (copy_from_user (&buffer, buf, n))
+                       return -EFAULT;
+               buffer[n]=0;
+
+               if (count >= 4 && strncmp("auto", buffer, 4)==0)
+                       restart_after_close = 1;
+
+               else if (count >= 6 && strncmp("manual", buffer, 6)==0)
+                       restart_after_close = 0;
+
+               return n;
+	}
+
+	return 0;
+}
+
+static ssize_t mtx1wd_read (struct file *file, char *buf, size_t count, loff_t *ppos)
+{
+       char * state = restart_after_close ? "auto\n" : "manual\n";
+       int n = strlen(state)+1;
+
+       if (file->f_pos >= n)
+               return 0;
+
+       if (count < n)
+               return -EINVAL;
+
+       if(copy_to_user(buf, state, n))
+               return -EFAULT;
+
+       file->f_pos += n;
+
+       return n;
+}
+
+static struct file_operations mtx1wd_fops = {
+	.owner = THIS_MODULE,
+	.read = mtx1wd_read,
+	.write = mtx1wd_write,
+	.open = mtx1wd_open,
+	.release = mtx1wd_release
+};
+
+
+static struct miscdevice mtx1wd_miscdev = {
+	WATCHDOG_MINOR,
+	"watchdog",
+	&mtx1wd_fops
+};
+
+
+
+//---------[ Module Functions ]-----------------
+
+
+static int __init init_mtx1_watchdog(void)
+{
+	printk("MTX-1 watchdog driver\n");
+
+	misc_register(&mtx1wd_miscdev);
+	
+	restart_after_close = 0;
+
+	mtx1_enable_wd ();
+
+	//-- trigger it for the first time.
+	//-- We do not exactly know how long it has not been triggered.
+	mtx1_trigger_wd ();
+
+	// start a timer, that calls mtx1_trigger_wd every 5 seconds.
+	start_wd_timer();
+
+	return 0;
+}
+
+static void __exit exit_mtx1_watchdog(void) {
+
+	// stop the timer, if it is running.
+        stop_wd_timer();
+
+        misc_deregister(&mtx1wd_miscdev);
+
+        mtx1_disable_wd();
+}
+
+module_init(init_mtx1_watchdog);
+module_exit(exit_mtx1_watchdog);
+
+MODULE_AUTHOR("Michael Stickel");
+MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
+MODULE_LICENSE("GPL");