target/linux: refresh 2.6.32 patches
[openwrt/openwrt.git] / target / linux / atheros / patches-2.6.32 / 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 @@ -850,6 +850,12 @@ config TXX9_WDT
207 help
208 Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
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 @@ -113,6 +113,7 @@ obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
222 obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
223 obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
224 obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
225 +obj-$(CONFIG_ATHEROS_WDT) += ar2315-wtd.o
226
227 # PARISC Architecture
228