Root/target/linux/ifxmips/patches-2.6.30/150-wdt.patch

1Index: linux-2.6.30.8/drivers/watchdog/Makefile
2===================================================================
3--- linux-2.6.30.8.orig/drivers/watchdog/Makefile 2009-09-24 17:28:02.000000000 +0200
4+++ linux-2.6.30.8/drivers/watchdog/Makefile 2009-10-19 21:31:32.000000000 +0200
5@@ -105,6 +105,7 @@
6 obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
7 obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
8 obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
9+obj-$(CONFIG_IFXMIPS_WDT) += ifxmips_wdt.o
10 
11 # PARISC Architecture
12 
13Index: linux-2.6.30.8/drivers/watchdog/Kconfig
14===================================================================
15--- linux-2.6.30.8.orig/drivers/watchdog/Kconfig 2009-09-24 17:28:02.000000000 +0200
16+++ linux-2.6.30.8/drivers/watchdog/Kconfig 2009-10-19 21:31:32.000000000 +0200
17@@ -764,6 +764,12 @@
18     help
19       Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
20 
21+config IFXMIPS_WDT
22+ bool "IFXMips watchdog"
23+ depends on IFXMIPS
24+ help
25+ Hardware driver for the IFXMIPS Watchdog Timer.
26+
27 # PARISC Architecture
28 
29 # POWERPC Architecture
30Index: linux-2.6.30.8/drivers/watchdog/ifxmips_wdt.c
31===================================================================
32--- /dev/null 1970-01-01 00:00:00.000000000 +0000
33+++ linux-2.6.30.8/drivers/watchdog/ifxmips_wdt.c 2009-10-19 21:40:17.000000000 +0200
34@@ -0,0 +1,195 @@
35+/*
36+ * This program is free software; you can redistribute it and/or modify
37+ * it under the terms of the GNU General Public License as published by
38+ * the Free Software Foundation; either version 2 of the License, or
39+ * (at your option) any later version.
40+ *
41+ * This program is distributed in the hope that it will be useful,
42+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
43+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
44+ * GNU General Public License for more details.
45+ *
46+ * You should have received a copy of the GNU General Public License
47+ * along with this program; if not, write to the Free Software
48+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
49+ *
50+ * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
51+ * Based on EP93xx wdt driver
52+ */
53+
54+#include <linux/module.h>
55+#include <linux/fs.h>
56+#include <linux/miscdevice.h>
57+#include <linux/miscdevice.h>
58+#include <linux/watchdog.h>
59+#include <linux/platform_device.h>
60+#include <linux/uaccess.h>
61+
62+#include <ifxmips.h>
63+#include <ifxmips_cgu.h>
64+
65+#define IFXMIPS_WDT_PW1 0x00BE0000
66+#define IFXMIPS_WDT_PW2 0x00DC0000
67+
68+#ifndef CONFIG_WATCHDOG_NOWAYOUT
69+static int wdt_ok_to_close;
70+#endif
71+
72+static int wdt_timeout = 30;
73+
74+int ifxmips_wdt_enable(unsigned int timeout)
75+{
76+ u32 fpi;
77+ fpi = cgu_get_io_region_clock();
78+ ifxmips_w32(IFXMIPS_WDT_PW1, IFXMIPS_BIU_WDT_CR);
79+ ifxmips_w32(IFXMIPS_WDT_PW2 |
80+ (0x3 << 26) | /* PWL */
81+ (0x3 << 24) | /* CLKDIV */
82+ (0x1 << 31) | /* enable */
83+ ((timeout * (fpi / 0x40000)) + 0x1000), /* reload */
84+ IFXMIPS_BIU_WDT_CR);
85+ return 0;
86+}
87+
88+void ifxmips_wdt_disable(void)
89+{
90+#ifndef CONFIG_WATCHDOG_NOWAYOUT
91+ wdt_ok_to_close = 0;
92+#endif
93+ ifxmips_w32(IFXMIPS_WDT_PW1, IFXMIPS_BIU_WDT_CR);
94+ ifxmips_w32(IFXMIPS_WDT_PW2, IFXMIPS_BIU_WDT_CR);
95+}
96+
97+static ssize_t ifxmips_wdt_write(struct file *file, const char __user *data,
98+ size_t len, loff_t *ppos)
99+{
100+ size_t i;
101+
102+ if (!len)
103+ return 0;
104+
105+#ifndef CONFIG_WATCHDOG_NOWAYOUT
106+ for (i = 0; i != len; i++) {
107+ char c;
108+ if (get_user(c, data + i))
109+ return -EFAULT;
110+ if (c == 'V')
111+ wdt_ok_to_close = 1;
112+ }
113+#endif
114+ ifxmips_wdt_enable(wdt_timeout);
115+ return len;
116+}
117+
118+static struct watchdog_info ident = {
119+ .options = WDIOF_MAGICCLOSE,
120+ .identity = "ifxmips Watchdog",
121+};
122+
123+static int ifxmips_wdt_ioctl(struct inode *inode, struct file *file,
124+ unsigned int cmd, unsigned long arg)
125+{
126+ int ret = -ENOTTY;
127+
128+ switch (cmd) {
129+ case WDIOC_GETSUPPORT:
130+ ret = copy_to_user((struct watchdog_info __user *)arg, &ident,
131+ sizeof(ident)) ? -EFAULT : 0;
132+ break;
133+
134+ case WDIOC_GETTIMEOUT:
135+ ret = put_user(wdt_timeout, (int __user *)arg);
136+ break;
137+
138+ case WDIOC_SETTIMEOUT:
139+ ret = get_user(wdt_timeout, (int __user *)arg);
140+ break;
141+
142+ case WDIOC_KEEPALIVE:
143+ ifxmips_wdt_enable(wdt_timeout);
144+ ret = 0;
145+ break;
146+ }
147+ return ret;
148+}
149+
150+static int ifxmips_wdt_open(struct inode *inode, struct file *file)
151+{
152+ ifxmips_wdt_enable(wdt_timeout);
153+ return nonseekable_open(inode, file);
154+}
155+
156+static int ifxmips_wdt_release(struct inode *inode, struct file *file)
157+{
158+#ifndef CONFIG_WATCHDOG_NOWAYOUT
159+ if (wdt_ok_to_close)
160+ ifxmips_wdt_disable();
161+ else
162+#endif
163+ printk(KERN_ERR "ifxmips_wdt: watchdog closed without warning,"
164+ " rebooting system\n");
165+ return 0;
166+}
167+
168+static const struct file_operations ifxmips_wdt_fops = {
169+ .owner = THIS_MODULE,
170+ .write = ifxmips_wdt_write,
171+ .ioctl = ifxmips_wdt_ioctl,
172+ .open = ifxmips_wdt_open,
173+ .release = ifxmips_wdt_release,
174+};
175+
176+static struct miscdevice ifxmips_wdt_miscdev = {
177+ .minor = WATCHDOG_MINOR,
178+ .name = "watchdog",
179+ .fops = &ifxmips_wdt_fops,
180+};
181+
182+static int ifxmips_wdt_probe(struct platform_device *dev)
183+{
184+ int err;
185+ err = misc_register(&ifxmips_wdt_miscdev);
186+ if (err)
187+ printk(KERN_INFO "ifxmips_wdt: error creating device\n");
188+ else
189+ printk(KERN_INFO "ifxmips_wdt: loaded\n");
190+ return err;
191+}
192+
193+static int ifxmips_wdt_remove(struct platform_device *dev)
194+{
195+ ifxmips_wdt_disable();
196+ misc_deregister(&ifxmips_wdt_miscdev);
197+ return 0;
198+}
199+
200+
201+static struct platform_driver ifxmips_wdt_driver = {
202+ .probe = ifxmips_wdt_probe,
203+ .remove = ifxmips_wdt_remove,
204+ .driver = {
205+ .name = "ifxmips_wdt",
206+ .owner = THIS_MODULE,
207+ },
208+};
209+
210+static int __init init_ifxmips_wdt(void)
211+{
212+ int ret = platform_driver_register(&ifxmips_wdt_driver);
213+ if (ret)
214+ printk(KERN_INFO "ifxmips_wdt: error registering platfom driver!");
215+ return ret;
216+}
217+
218+static void __exit exit_ifxmips_wdt(void)
219+{
220+ platform_driver_unregister(&ifxmips_wdt_driver);
221+}
222+
223+module_init(init_ifxmips_wdt);
224+module_exit(exit_ifxmips_wdt);
225+
226+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
227+MODULE_DESCRIPTION("ifxmips Watchdog");
228+MODULE_LICENSE("GPL");
229+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
230

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