summaryrefslogtreecommitdiff
path: root/target/linux/coldfire/patches/031-Add-watchdog-driver-support-for-MCF5445x-and-MCF547x.patch
blob: 5362aa3334e267ad596ffa42996673dcb1e468eb (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
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
From 42bf8a598049f6cb3c90b1f28a2f1b8daebe3de8 Mon Sep 17 00:00:00 2001
From: Alison Wang <b18965@freescale.com>
Date: Thu, 4 Aug 2011 09:59:47 +0800
Subject: [PATCH 31/52] Add watchdog driver support for MCF5445x and MCF547x/MCF548x

Add watchdog driver support for MCF5445x and MCF547x/MCF548x.

Signed-off-by: Alison Wang <b18965@freescale.com>
---
 drivers/watchdog/Kconfig   |    9 ++
 drivers/watchdog/Makefile  |    1 +
 drivers/watchdog/mcf_wdt.c |  292 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 302 insertions(+), 0 deletions(-)
 create mode 100644 drivers/watchdog/mcf_wdt.c

--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -974,6 +974,15 @@ config BCM63XX_WDT
 
 # PARISC Architecture
 
+# ColdFire Architecture
+
+config COLDFIRE_WATCHDOG
+	tristate "ColdFire watchdog support"
+	depends on M547X_8X || M5445X || M5441X
+	help
+	  To compile this driver as a module, choose M here: the
+	  module will be called softdog.
+
 # POWERPC Architecture
 
 config GEF_WDT
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -107,6 +107,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc
 
 # M68K Architecture
 obj-$(CONFIG_M54xx_WATCHDOG) += m54xx_wdt.o
+obj-$(CONFIG_COLDFIRE_WATCHDOG) += mcf_wdt.o
 
 # MIPS Architecture
 obj-$(CONFIG_ATH79_WDT) += ath79_wdt.o
--- /dev/null
+++ b/drivers/watchdog/mcf_wdt.c
@@ -0,0 +1,292 @@
+/*
+ * drivers/watchdog/mcf_wdt.c
+ *
+ * Watchdog driver for ColdFire processors
+ *
+ * Copyright (C) 2006-2007, 2009-2011 Freescale Semiconductor, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Shrek Wu<B16972@freesale.com>
+ *         ChengJu Cai<B22600@freesale.com>
+ *
+ * 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 <linux/uaccess.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+
+static int nowayout;
+static unsigned int heartbeat = MCF_GPT_MAX_TIMEOUT;
+static unsigned long wdt_status;
+
+#define	WDT_IN_USE		0
+#define	WDT_OK_TO_CLOSE		1
+
+static unsigned long wdt_tick_rate;
+
+#ifdef CONFIG_M547X_8X
+static int
+wdt_enable(int time)
+{
+	if (time > 30 || time < 1)
+		return -EINVAL;
+
+	heartbeat = time;
+
+	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;
+
+	return 0;
+}
+
+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;
+}
+
+#elif defined(CONFIG_M5445X) || defined(CONFIG_M5441X)
+
+/* Enable watchdog and set time-out */
+static int
+wdt_enable(int time)
+{
+	unsigned int sign = 0x01 << 31;
+	int i = 0, timeout_n = 31;
+	int max_timeout = sign / MCF_BUSCLK;
+	unsigned int count;
+
+	if (time > max_timeout || time < 1)
+		return -EINVAL;
+
+	count = time * MCF_BUSCLK;
+
+	for (i = 0; i < 31; i++) {
+		if (count & (sign >> i)) {
+			if ((count & (~(sign >> i))) == 0)
+				timeout_n = 31 - i;
+			else
+				timeout_n = 31 - i + 1;
+			break;
+		}
+	}
+
+	heartbeat = (unsigned int)(0x01 << timeout_n) / MCF_BUSCLK;
+
+	MCF_SCM_CWCR = MCF_SCM_CWCR_CWE
+			| MCF_SCM_CWCR_CWRI(0x02)
+			| MCF_SCM_CWCR_CWT(timeout_n);
+
+	return 0;
+}
+
+/* Disable the watchdog */
+static void
+wdt_disable(void)
+{
+	MCF_SCM_CWCR = 0x00;
+}
+
+/* Reset the watchdog timer counter */
+static void
+wdt_keepalive(void)
+{
+	MCF_SCM_CWSR = 0x55;
+	MCF_SCM_CWSR = 0xAA;
+}
+#endif
+
+static int
+mcf_wdt_open(struct inode *inode, struct file *file)
+{
+	int ret;
+	if (test_and_set_bit(WDT_IN_USE, &wdt_status))
+		return -EBUSY;
+
+	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+	ret = wdt_enable(heartbeat);
+	if (ret)
+		return ret;
+
+	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 long
+mcf_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long __user arg)
+{
+	long ret = -ENOIOCTLCMD;
+	int time = 0;
+
+	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;
+
+		ret = wdt_enable(time);
+		if (ret)
+			break;
+		ret = put_user(heartbeat, (int *)arg);
+		break;
+
+	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)) {
+#ifdef CONFIG_M547X_8X
+		MCF_GPT_GCIR0 = (0x0A << 16) | 0x09;
+		MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS0;
+#else
+		wdt_keepalive();
+#endif
+	} else {
+		printk(KERN_CRIT "WATCHDOG: Device closed unexpectdly\n");
+		wdt_disable();
+	}
+
+	clear_bit(WDT_IN_USE, &wdt_status);
+	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+#ifdef CONFIG_M547X_8X
+	/*disable the XLB priority, otherwise the watchdog reset may fail*/
+	MCF_XARB_PRIEN = 0;
+	/* Also disable the PCI, Ugly! But there is issue between PCI and
+	 * watchdog. Otherwise the watchdog reset may fail, only valuable
+	 * for testing!
+	 */
+	MCF_SPCR &= ~0x02;
+	asm("tpf");
+#endif
+
+	return 0;
+}
+
+
+static const struct file_operations mcf_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= mcf_wdt_write,
+	.unlocked_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(KERN_INFO "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);
+