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
|
From 3c6c80a04d6ca99c4f9fbb5e4f279bd644b2df48 Mon Sep 17 00:00:00 2001
From: Kurt Mahan <kmahan@freescale.com>
Date: Tue, 8 Jul 2008 14:10:46 -0600
Subject: [PATCH] Add Coldfire Watchdog support.
LTIBName: mcfv4e-watchdog
Signed-off-by: Kurt Mahan <kmahan@freescale.com>
---
drivers/watchdog/Kconfig | 9 ++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/mcf_wdt.c | 220 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 230 insertions(+), 0 deletions(-)
create mode 100644 drivers/watchdog/mcf_wdt.c
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -672,6 +672,15 @@ config TXX9_WDT
# PARISC Architecture
+# ColdFire Architecture
+
+config COLDFIRE_WATCHDOG
+ tristate "ColdFire watchdog support"
+ depends on WATCHDOG
+ help
+ To compile this driver as a module, choose M here: the
+ module will be called softdog.
+
# POWERPC Architecture
config MPC5200_WDT
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -86,6 +86,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc
# M32R Architecture
# M68K Architecture
+obj-$(CONFIG_COLDFIRE_WATCHDOG) += mcf_wdt.o
# M68KNOMMU Architecture
--- /dev/null
+++ b/drivers/watchdog/mcf_wdt.c
@@ -0,0 +1,220 @@
+/*
+ * drivers/watchdog/mcf_wdt.c
+ *
+ * Watchdog driver for ColdFire processors
+ *
+ * Adapted from the IXP4xx watchdog driver.
+ * The original version carries these notices:
+ *
+ * Author: Deepak Saxena <dsaxena@plexity.net>
+ *
+ * Copyright 2004 (c) MontaVista, Software, Inc.
+ * Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+
+#include <asm-m68k/uaccess.h>
+#include <asm-m68k/coldfire.h>
+#include <asm-m68k/m5485gpt.h>
+
+static int nowayout;
+static unsigned int heartbeat = 30; /* (secs) Default is 0.5 minute */
+static unsigned long wdt_status;
+
+#define WDT_IN_USE 0
+#define WDT_OK_TO_CLOSE 1
+
+static unsigned long wdt_tick_rate;
+
+static void
+wdt_enable(void)
+{
+ MCF_GPT_GMS0 = 0;
+ MCF_GPT_GCIR0 = MCF_GPT_GCIR_PRE(heartbeat*wdt_tick_rate) |
+ MCF_GPT_GCIR_CNT(0xffff);
+ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS_WDEN |
+ MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS_GPIO;
+}
+
+static void
+wdt_disable(void)
+{
+ MCF_GPT_GMS0 = 0;
+}
+
+static void
+wdt_keepalive(void)
+{
+ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS0;
+}
+
+static int
+mcf_wdt_open(struct inode *inode, struct file *file)
+{
+ if (test_and_set_bit(WDT_IN_USE, &wdt_status))
+ return -EBUSY;
+
+ clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+ wdt_enable();
+
+ return nonseekable_open(inode, file);
+}
+
+static ssize_t
+mcf_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+{
+ if (len) {
+ if (!nowayout) {
+ size_t i;
+
+ clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+ for (i = 0; i != len; i++) {
+ char c;
+
+ if (get_user(c, data + i))
+ return -EFAULT;
+ if (c == 'V')
+ set_bit(WDT_OK_TO_CLOSE, &wdt_status);
+ }
+ }
+ wdt_keepalive();
+ }
+
+ return len;
+}
+
+
+static struct watchdog_info ident = {
+ .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING,
+ .identity = "Coldfire Watchdog",
+};
+
+static int
+mcf_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int ret = -ENOIOCTLCMD;
+ int time;
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ ret = copy_to_user((struct watchdog_info *)arg, &ident,
+ sizeof(ident)) ? -EFAULT : 0;
+ break;
+
+ case WDIOC_GETSTATUS:
+ ret = put_user(0, (int *)arg);
+ break;
+
+ case WDIOC_GETBOOTSTATUS:
+ ret = put_user(0, (int *)arg);
+ break;
+
+ case WDIOC_SETTIMEOUT:
+ ret = get_user(time, (int *)arg);
+ if (ret)
+ break;
+
+ if (time <= 0 || time > 30) {
+ ret = -EINVAL;
+ break;
+ }
+
+ heartbeat = time;
+ wdt_enable();
+ /* Fall through */
+
+ case WDIOC_GETTIMEOUT:
+ ret = put_user(heartbeat, (int *)arg);
+ break;
+
+ case WDIOC_KEEPALIVE:
+ wdt_keepalive();
+ ret = 0;
+ break;
+ }
+
+ return ret;
+}
+
+static int
+mcf_wdt_release(struct inode *inode, struct file *file)
+{
+ if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) {
+ wdt_disable();
+ } else {
+ printk(KERN_CRIT "WATCHDOG: Device closed unexpectdly - "
+ "timer will not stop\n");
+ }
+
+ clear_bit(WDT_IN_USE, &wdt_status);
+ clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+ return 0;
+}
+
+
+static struct file_operations mcf_wdt_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = mcf_wdt_write,
+ .ioctl = mcf_wdt_ioctl,
+ .open = mcf_wdt_open,
+ .release = mcf_wdt_release,
+};
+
+static struct miscdevice mcf_wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &mcf_wdt_fops,
+};
+
+static int __init mcf_wdt_init(void)
+{
+ wdt_tick_rate = MCF_BUSCLK/0xffff;
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ nowayout = 1;
+#else
+ nowayout = 0;
+#endif
+ printk("ColdFire watchdog driver is loaded.\n");
+
+ return misc_register(&mcf_wdt_miscdev);
+}
+
+static void __exit mcf_wdt_exit(void)
+{
+ misc_deregister(&mcf_wdt_miscdev);
+}
+
+module_init(mcf_wdt_init);
+module_exit(mcf_wdt_exit);
+
+MODULE_AUTHOR("Deepak Saxena");
+MODULE_DESCRIPTION("ColdFire Watchdog");
+
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 60s)");
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
|
