Root/target/linux/atheros/patches-2.6.37/130-watchdog.patch

1--- /dev/null
2+++ b/drivers/watchdog/ar2315-wtd.c
3@@ -0,0 +1,200 @@
4+/*
5+ * This program is free software; you can redistribute it and/or modify
6+ * it under the terms of the GNU General Public License as published by
7+ * the Free Software Foundation; either version 2 of the License, or
8+ * (at your option) any later version.
9+ *
10+ * This program is distributed in the hope that it will be useful,
11+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
12+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13+ * GNU General Public License for more details.
14+ *
15+ * You should have received a copy of the GNU General Public License
16+ * along with this program; if not, write to the Free Software
17+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18+ *
19+ * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
20+ * Based on EP93xx and ifxmips wdt driver
21+ */
22+
23+#include <linux/interrupt.h>
24+#include <linux/module.h>
25+#include <linux/moduleparam.h>
26+#include <linux/types.h>
27+#include <linux/miscdevice.h>
28+#include <linux/watchdog.h>
29+#include <linux/fs.h>
30+#include <linux/ioport.h>
31+#include <linux/notifier.h>
32+#include <linux/reboot.h>
33+#include <linux/init.h>
34+#include <linux/platform_device.h>
35+
36+#include <asm/io.h>
37+#include <asm/uaccess.h>
38+#include <asm/system.h>
39+#include <asm/addrspace.h>
40+#include <ar231x_platform.h>
41+#include <ar2315_regs.h>
42+#include <ar231x.h>
43+
44+#define CLOCK_RATE 40000000
45+#define HEARTBEAT(x) (x < 1 || x > 90)?(20):(x)
46+
47+static int wdt_timeout = 20;
48+static int started = 0;
49+static int in_use = 0;
50+
51+static void
52+ar2315_wdt_enable(void)
53+{
54+ ar231x_write_reg(AR2315_WD, wdt_timeout * CLOCK_RATE);
55+ ar231x_write_reg(AR2315_ISR, 0x80);
56+}
57+
58+static ssize_t
59+ar2315_wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos)
60+{
61+ if(len)
62+ ar2315_wdt_enable();
63+ return len;
64+}
65+
66+static int
67+ar2315_wdt_open(struct inode *inode, struct file *file)
68+{
69+ if(in_use)
70+ return -EBUSY;
71+ ar2315_wdt_enable();
72+ in_use = started = 1;
73+ return nonseekable_open(inode, file);
74+}
75+
76+static int
77+ar2315_wdt_release(struct inode *inode, struct file *file)
78+{
79+ in_use = 0;
80+ return 0;
81+}
82+
83+static irqreturn_t
84+ar2315_wdt_interrupt(int irq, void *dev_id)
85+{
86+ if(started)
87+ {
88+ printk(KERN_CRIT "watchdog expired, rebooting system\n");
89+ emergency_restart();
90+ } else {
91+ ar231x_write_reg(AR2315_WDC, 0);
92+ ar231x_write_reg(AR2315_WD, 0);
93+ ar231x_write_reg(AR2315_ISR, 0x80);
94+ }
95+ return IRQ_HANDLED;
96+}
97+
98+static struct watchdog_info ident = {
99+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
100+ .identity = "ar2315 Watchdog",
101+};
102+
103+static int
104+ar2315_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
105+{
106+ int new_wdt_timeout;
107+ int ret = -ENOIOCTLCMD;
108+
109+ switch(cmd)
110+ {
111+ case WDIOC_GETSUPPORT:
112+ ret = copy_to_user((struct watchdog_info __user *)arg, &ident, sizeof(ident)) ? -EFAULT : 0;
113+ break;
114+
115+ case WDIOC_KEEPALIVE:
116+ ar2315_wdt_enable();
117+ ret = 0;
118+ break;
119+
120+ case WDIOC_SETTIMEOUT:
121+ if((ret = get_user(new_wdt_timeout, (int __user *)arg)))
122+ break;
123+ wdt_timeout = HEARTBEAT(new_wdt_timeout);
124+ ar2315_wdt_enable();
125+ break;
126+
127+ case WDIOC_GETTIMEOUT:
128+ ret = put_user(wdt_timeout, (int __user *)arg);
129+ break;
130+ }
131+ return ret;
132+}
133+
134+static struct file_operations ar2315_wdt_fops = {
135+ .owner = THIS_MODULE,
136+ .llseek = no_llseek,
137+ .write = ar2315_wdt_write,
138+ .ioctl = ar2315_wdt_ioctl,
139+ .open = ar2315_wdt_open,
140+ .release = ar2315_wdt_release,
141+};
142+
143+static struct miscdevice ar2315_wdt_miscdev = {
144+ .minor = WATCHDOG_MINOR,
145+ .name = "watchdog",
146+ .fops = &ar2315_wdt_fops,
147+};
148+
149+static int
150+ar2315_wdt_probe(struct platform_device *dev)
151+{
152+ int ret = 0;
153+
154+ ar2315_wdt_enable();
155+ ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt, IRQF_DISABLED, "ar2315_wdt", NULL);
156+ if(ret)
157+ {
158+ printk(KERN_ERR "ar2315wdt: failed to register inetrrupt\n");
159+ goto out;
160+ }
161+
162+ ret = misc_register(&ar2315_wdt_miscdev);
163+ if(ret)
164+ printk(KERN_ERR "ar2315wdt: failed to register miscdev\n");
165+
166+out:
167+ return ret;
168+}
169+
170+static int
171+ar2315_wdt_remove(struct platform_device *dev)
172+{
173+ misc_deregister(&ar2315_wdt_miscdev);
174+ free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL);
175+ return 0;
176+}
177+
178+static struct platform_driver ar2315_wdt_driver = {
179+ .probe = ar2315_wdt_probe,
180+ .remove = ar2315_wdt_remove,
181+ .driver = {
182+ .name = "ar2315_wdt",
183+ .owner = THIS_MODULE,
184+ },
185+};
186+
187+static int __init
188+init_ar2315_wdt(void)
189+{
190+ int ret = platform_driver_register(&ar2315_wdt_driver);
191+ if(ret)
192+ printk(KERN_INFO "ar2315_wdt: error registering platfom driver!");
193+ return ret;
194+}
195+
196+static void __exit
197+exit_ar2315_wdt(void)
198+{
199+ platform_driver_unregister(&ar2315_wdt_driver);
200+}
201+
202+module_init(init_ar2315_wdt);
203+module_exit(exit_ar2315_wdt);
204--- a/drivers/watchdog/Kconfig
205+++ b/drivers/watchdog/Kconfig
206@@ -930,6 +930,12 @@ config BCM63XX_WDT
207       To compile this driver as a loadable module, choose M here.
208       The module will be called bcm63xx_wdt.
209 
210+config ATHEROS_WDT
211+ tristate "Atheros wisoc Watchdog Timer"
212+ depends on ATHEROS_AR231X
213+ help
214+ Hardware driver for the Atheros wisoc Watchdog Timer.
215+
216 # PARISC Architecture
217 
218 # POWERPC Architecture
219--- a/drivers/watchdog/Makefile
220+++ b/drivers/watchdog/Makefile
221@@ -116,6 +116,7 @@ obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
222 obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
223 obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
224 obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
225+obj-$(CONFIG_ATHEROS_WDT) += ar2315-wtd.o
226 obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
227 obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
228 octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
229

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