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
|
--- /dev/null
+++ b/drivers/watchdog/ar2315-wtd.c
@@ -0,0 +1,186 @@
+/*
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
+ * Based on EP93xx and ifxmips wdt driver
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <ar231x_platform.h>
+#include <ar2315_regs.h>
+#include <ar231x.h>
+
+#define DRIVER_NAME "ar2315-wdt"
+
+#define CLOCK_RATE 40000000
+#define HEARTBEAT(x) (x < 1 || x > 90 ? 20 : x)
+
+static int wdt_timeout = 20;
+static int started;
+static int in_use;
+
+static void
+ar2315_wdt_enable(void)
+{
+ ar231x_write_reg(AR2315_WD, wdt_timeout * CLOCK_RATE);
+}
+
+static ssize_t
+ar2315_wdt_write(struct file *file, const char __user *data, size_t len,
+ loff_t *ppos)
+{
+ if (len)
+ ar2315_wdt_enable();
+ return len;
+}
+
+static int
+ar2315_wdt_open(struct inode *inode, struct file *file)
+{
+ if (in_use)
+ return -EBUSY;
+ ar2315_wdt_enable();
+ in_use = started = 1;
+ return nonseekable_open(inode, file);
+}
+
+static int
+ar2315_wdt_release(struct inode *inode, struct file *file)
+{
+ in_use = 0;
+ return 0;
+}
+
+static irqreturn_t
+ar2315_wdt_interrupt(int irq, void *dev)
+{
+ struct platform_device *pdev = (struct platform_device *)dev;
+
+ if (started) {
+ dev_crit(&pdev->dev, "watchdog expired, rebooting system\n");
+ emergency_restart();
+ } else {
+ ar231x_write_reg(AR2315_WDC, 0);
+ ar231x_write_reg(AR2315_WD, 0);
+ }
+ return IRQ_HANDLED;
+}
+
+static struct watchdog_info ident = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+ .identity = "ar2315 Watchdog",
+};
+
+static long
+ar2315_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int new_wdt_timeout;
+ int ret = -ENOIOCTLCMD;
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ ret = copy_to_user((void __user *)arg, &ident, sizeof(ident)) ?
+ -EFAULT : 0;
+ break;
+ case WDIOC_KEEPALIVE:
+ ar2315_wdt_enable();
+ ret = 0;
+ break;
+ case WDIOC_SETTIMEOUT:
+ ret = get_user(new_wdt_timeout, (int __user *)arg);
+ if (ret)
+ break;
+ wdt_timeout = HEARTBEAT(new_wdt_timeout);
+ ar2315_wdt_enable();
+ break;
+ case WDIOC_GETTIMEOUT:
+ ret = put_user(wdt_timeout, (int __user *)arg);
+ break;
+ }
+ return ret;
+}
+
+static const struct file_operations ar2315_wdt_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = ar2315_wdt_write,
+ .unlocked_ioctl = ar2315_wdt_ioctl,
+ .open = ar2315_wdt_open,
+ .release = ar2315_wdt_release,
+};
+
+static struct miscdevice ar2315_wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &ar2315_wdt_fops,
+};
+
+static int
+ar2315_wdt_probe(struct platform_device *dev)
+{
+ int ret = 0;
+
+ ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt,
+ IRQF_DISABLED, DRIVER_NAME, dev);
+ if (ret) {
+ dev_err(&dev->dev, "failed to register inetrrupt\n");
+ goto out;
+ }
+
+ ret = misc_register(&ar2315_wdt_miscdev);
+ if (ret)
+ dev_err(&dev->dev, "failed to register miscdev\n");
+
+out:
+ return ret;
+}
+
+static int
+ar2315_wdt_remove(struct platform_device *dev)
+{
+ misc_deregister(&ar2315_wdt_miscdev);
+ free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL);
+ return 0;
+}
+
+static struct platform_driver ar2315_wdt_driver = {
+ .probe = ar2315_wdt_probe,
+ .remove = ar2315_wdt_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(ar2315_wdt_driver);
+
+MODULE_DESCRIPTION("Atheros AR2315 hardware watchdog driver");
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1113,6 +1113,13 @@ config LANTIQ_WDT
help
Hardware driver for the Lantiq SoC Watchdog Timer.
+config AR2315_WDT
+ tristate "Atheros AR2315+ WiSoCs Watchdog Timer"
+ depends on ATHEROS_AR231X
+ help
+ Hardware driver for the built-in watchdog timer on the Atheros
+ AR2315/AR2316 WiSoCs.
+
# PARISC Architecture
# POWERPC Architecture
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -131,6 +131,7 @@ obj-$(CONFIG_GPIO_WDT) += gpio_wdt.o
obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
+obj-$(CONFIG_AR2315_WDT) += ar2315-wtd.o
obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
|
