6b13f685e
 김민수
BSP 최초 추가
|
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
|
From e1d54ffb987c346c45c20968be34c50c62a91c07 Mon Sep 17 00:00:00 2001
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Date: Wed, 14 Nov 2012 19:17:47 +0800
Subject: [PATCH 2/5] watchdog: add at91sam9 watchdog support
with keep alive support
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
drivers/watchdog/Kconfig | 7 +++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/at91sam9_wdt.c | 131 ++++++++++++++++++++++++++++++++++++++++
drivers/watchdog/at91sam9_wdt.h | 38 ++++++++++++
4 files changed, 177 insertions(+)
create mode 100644 drivers/watchdog/at91sam9_wdt.c
create mode 100644 drivers/watchdog/at91sam9_wdt.h
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 0b4dc84..98a21d7 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -11,6 +11,13 @@ menuconfig WATCHDOG
if WATCHDOG
+config WATCHDOG_AT91SAM9X
+ tristate "AT91SAM9X / AT91CAP9 watchdog"
+ depends on ARCH_AT91
+ help
+ Watchdog timer embedded into AT91SAM9X and AT91CAP9 chips. This will
+ reboot your system when the timeout is reached.
+
config WATCHDOG_MXS28
bool "i.MX28"
depends on ARCH_IMX28
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index f522b88..3d15d52 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_WATCHDOG) += wd_core.o
+obj-$(CONFIG_WATCHDOG_AT91SAM9X) += at91sam9_wdt.o
obj-$(CONFIG_WATCHDOG_MXS28) += im28wd.o
obj-$(CONFIG_WATCHDOG_IMX_RESET_SOURCE) += imxwd.o
diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c
new file mode 100644
index 0000000..203d83a
--- /dev/null
+++ b/drivers/watchdog/at91sam9_wdt.c
@@ -0,0 +1,131 @@
+/*
+ * (c) 2012 Juergen Beisert <kernel@pengutronix.de>
+ *
+ * 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.
+ *
+ * Note: this driver works for the i.MX28 SoC. It might work for the
+ * i.MX23 Soc as well, but is not tested yet.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <io.h>
+#include <errno.h>
+#include <malloc.h>
+#include <watchdog.h>
+
+#include "at91sam9_wdt.h"
+
+struct at91sam9_wdt {
+ struct watchdog wdt;
+ void __iomem *base;
+};
+
+#define to_at91sam9_wdt(h) container_of(h, struct at91sam9_wdt, wdt)
+
+#define wdt_read(at91wdt, field) \
+ __raw_readl(at91wdt->base + field)
+#define wdt_write(at91wdt, field, val) \
+ __raw_writel((val), at91wdt->base + field)
+
+static void at91sam9_wdt_keep_alive(struct watchdog *wdt)
+{
+ struct at91sam9_wdt *at91wdt = to_at91sam9_wdt(wdt);
+
+ wdt_write(at91wdt, AT91_WDT_CR, AT91_WDT_KEY | AT91_WDT_WDRSTT);
+}
+
+static int at91sam9_wdt_settimeout(struct watchdog *wdt, unsigned int timeout)
+{
+ struct at91sam9_wdt *at91wdt = to_at91sam9_wdt(wdt);
+ unsigned int reg;
+ unsigned int mr;
+
+ /* Check if disabled */
+ mr = wdt_read(at91wdt, AT91_WDT_MR);
+ if (mr & AT91_WDT_WDDIS) {
+ pr_err("sorry, watchdog is disabled
");
+ return -EIO;
+ }
+
+ if (!timeout) {
+ wdt_write(at91wdt, AT91_WDT_MR, AT91_WDT_WDDIS);
+ return 0;
+ }
+
+ /*
+ * All counting occurs at SLOW_CLOCK / 128 = 256 Hz
+ *
+ * Since WDV is a 12-bit counter, the maximum period is
+ * 4096 / 256 = 16 seconds.
+ */
+ reg = AT91_WDT_WDRSTEN /* causes watchdog reset */
+ /* | AT91_WDT_WDRPROC causes processor reset only */
+ | AT91_WDT_WDDBGHLT /* disabled in debug mode */
+ | AT91_WDT_WDD /* restart at any time */
+ | (timeout & AT91_WDT_WDV); /* timer value */
+ wdt_write(at91wdt, AT91_WDT_MR, reg);
+
+ return 0;
+}
+
+static int at91sam9_wdt_probe(struct device_d *dev)
+{
+ struct at91sam9_wdt *priv;
+ struct watchdog *wdt;
+ int ret;
+ unsigned int mr;
+
+ priv = xzalloc(sizeof(struct at91sam9_wdt));
+ priv->base = dev_request_mem_region(dev, 0);
+ wdt = &priv->wdt;
+
+ wdt->set_timeout = at91sam9_wdt_settimeout;
+ wdt->keep_alive = at91sam9_wdt_keep_alive;
+
+ /* Check if disabled */
+ mr = wdt_read(priv, AT91_WDT_MR);
+ if (mr & AT91_WDT_WDDIS) {
+ dev_err(dev, "sorry, watchdog is disabled
");
+ ret = -EIO;
+ goto err;
+ }
+
+ ret = watchdog_register(wdt);
+ if (ret != 0)
+ goto err;
+
+ dev->priv = priv;
+ return 0;
+
+err:
+ free(priv);
+ return ret;
+}
+
+static void at91sam9_wdt_remove(struct device_d *dev)
+{
+ struct at91sam9_wdt *priv= dev->priv;
+ watchdog_deregister(&priv->wdt);
+ free(priv);
+}
+
+static struct driver_d at91sam9_wdt_driver = {
+ .name = "at91sam9_wdt",
+ .probe = at91sam9_wdt_probe,
+ .remove = at91sam9_wdt_remove,
+};
+
+static int at91sam9_wdt_init(void)
+{
+ return platform_driver_register(&at91sam9_wdt_driver);
+}
+coredevice_initcall(at91sam9_wdt_init);
diff --git a/drivers/watchdog/at91sam9_wdt.h b/drivers/watchdog/at91sam9_wdt.h
new file mode 100644
index 0000000..2b68c1a
--- /dev/null
+++ b/drivers/watchdog/at91sam9_wdt.h
@@ -0,0 +1,38 @@
+/*
+ * drivers/watchdog/at91sam9_wdt.h
+ *
+ * Copyright (C) 2007 Andrew Victor
+ * Copyright (C) 2007 Atmel Corporation.
+ *
+ * Watchdog Timer (WDT) - System peripherals regsters.
+ * Based on AT91SAM9261 datasheet revision D.
+ *
+ * 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.
+ */
+
+#ifndef AT91_WDT_H
+#define AT91_WDT_H
+
+#define AT91_WDT_CR 0x00 /* Watchdog Control Register */
+#define AT91_WDT_WDRSTT (1 << 0) /* Restart */
+#define AT91_WDT_KEY (0xa5 << 24) /* KEY Password */
+
+#define AT91_WDT_MR 0x04 /* Watchdog Mode Register */
+#define AT91_WDT_WDV (0xfff << 0) /* Counter Value */
+#define AT91_WDT_WDFIEN (1 << 12) /* Fault Interrupt Enable */
+#define AT91_WDT_WDRSTEN (1 << 13) /* Reset Processor */
+#define AT91_WDT_WDRPROC (1 << 14) /* Timer Restart */
+#define AT91_WDT_WDDIS (1 << 15) /* Watchdog Disable */
+#define AT91_WDT_WDD (0xfff << 16) /* Delta Value */
+#define AT91_WDT_WDDBGHLT (1 << 28) /* Debug Halt */
+#define AT91_WDT_WDIDLEHLT (1 << 29) /* Idle Halt */
+
+#define AT91_WDT_SR 0x08 /* Watchdog Status Register */
+#define AT91_WDT_WDUNF (1 << 0) /* Watchdog Underflow */
+#define AT91_WDT_WDERR (1 << 1) /* Watchdog Error */
+
+
+#endif
--
1.8.1.4
|