[ifxmips]:

[openwrt/svn-archive/archive.git] / target / linux / ifxmips / files / drivers / watchdog / ifxmips.c

diff --git a/target/linux/ifxmips/files/drivers/watchdog/ifxmips.c b/target/linux/ifxmips/files/drivers/watchdog/ifxmips.c
new file mode 100644 (file)
index 0000000..b06307c
--- /dev/null
+++ b/target/linux/ifxmips/files/drivers/watchdog/ifxmips.c
@@ -0,0 +1,195 @@
+/*
+ * 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 wdt driver
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+
+#include <ifxmips.h>
+#include <ifxmips_cgu.h>
+
+#define IFXMIPS_WDT_PW1                        0x00BE0000
+#define IFXMIPS_WDT_PW2                        0x00DC0000
+
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+static int wdt_ok_to_close;
+#endif
+
+static int wdt_timeout = 30;
+
+int ifxmips_wdt_enable(unsigned int timeout)
+{
+       u32 fpi;
+       fpi = cgu_get_io_region_clock();
+       ifxmips_w32(IFXMIPS_WDT_PW1, IFXMIPS_BIU_WDT_CR);
+       ifxmips_w32(IFXMIPS_WDT_PW2 |
+               (0x3 << 26) | /* PWL */
+               (0x3 << 24) | /* CLKDIV */
+               (0x1 << 31) | /* enable */
+               ((timeout * (fpi / 0x40000)) + 0x1000), /* reload */
+               IFXMIPS_BIU_WDT_CR);
+       return 0;
+}
+
+void ifxmips_wdt_disable(void)
+{
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+       wdt_ok_to_close = 0;
+#endif
+       ifxmips_w32(IFXMIPS_WDT_PW1, IFXMIPS_BIU_WDT_CR);
+       ifxmips_w32(IFXMIPS_WDT_PW2, IFXMIPS_BIU_WDT_CR);
+}
+
+static ssize_t ifxmips_wdt_write(struct file *file, const char __user *data,
+               size_t len, loff_t *ppos)
+{
+       size_t i;
+
+       if (!len)
+               return 0;
+
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+       for (i = 0; i != len; i++) {
+               char c;
+               if (get_user(c, data + i))
+                       return -EFAULT;
+               if (c == 'V')
+                       wdt_ok_to_close = 1;
+       }
+#endif
+       ifxmips_wdt_enable(wdt_timeout);
+       return len;
+}
+
+static struct watchdog_info ident = {
+       .options = WDIOF_MAGICCLOSE,
+       .identity = "ifxmips Watchdog",
+};
+
+static int ifxmips_wdt_ioctl(struct inode *inode, struct file *file,
+               unsigned int cmd, unsigned long arg)
+{
+       int ret = -ENOTTY;
+
+       switch (cmd) {
+       case WDIOC_GETSUPPORT:
+               ret = copy_to_user((struct watchdog_info __user *)arg, &ident,
+                               sizeof(ident)) ? -EFAULT : 0;
+               break;
+
+       case WDIOC_GETTIMEOUT:
+               ret = put_user(wdt_timeout, (int __user *)arg);
+               break;
+
+       case WDIOC_SETTIMEOUT:
+               ret = get_user(wdt_timeout, (int __user *)arg);
+               break;
+
+       case WDIOC_KEEPALIVE:
+               ifxmips_wdt_enable(wdt_timeout);
+               ret = 0;
+               break;
+       }
+       return ret;
+}
+
+static int ifxmips_wdt_open(struct inode *inode, struct file *file)
+{
+       ifxmips_wdt_enable(wdt_timeout);
+       return nonseekable_open(inode, file);
+}
+
+static int ifxmips_wdt_release(struct inode *inode, struct file *file)
+{
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+       if (wdt_ok_to_close)
+               ifxmips_wdt_disable();
+       else
+#endif
+               printk(KERN_ERR "ifxmips_wdt: watchdog closed without warning,"
+                       " rebooting system\n");
+       return 0;
+}
+
+static const struct file_operations ifxmips_wdt_fops = {
+       .owner          = THIS_MODULE,
+       .write          = ifxmips_wdt_write,
+       .ioctl          = ifxmips_wdt_ioctl,
+       .open           = ifxmips_wdt_open,
+       .release        = ifxmips_wdt_release,
+};
+
+static struct miscdevice ifxmips_wdt_miscdev = {
+       .minor          = WATCHDOG_MINOR,
+       .name           = "watchdog",
+       .fops           = &ifxmips_wdt_fops,
+};
+
+static int ifxmips_wdt_probe(struct platform_device *dev)
+{
+       int err;
+       err = misc_register(&ifxmips_wdt_miscdev);
+       if (err)
+               printk(KERN_INFO "ifxmips_wdt: error creating device\n");
+       else
+               printk(KERN_INFO "ifxmips_wdt: loaded\n");
+       return err;
+}
+
+static int ifxmips_wdt_remove(struct platform_device *dev)
+{
+       ifxmips_wdt_disable();
+       misc_deregister(&ifxmips_wdt_miscdev);
+       return 0;
+}
+
+
+static struct platform_driver ifxmips_wdt_driver = {
+       .probe = ifxmips_wdt_probe,
+       .remove = ifxmips_wdt_remove,
+       .driver = {
+               .name = "ifxmips_wdt",
+               .owner = THIS_MODULE,
+       },
+};
+
+static int __init init_ifxmips_wdt(void)
+{
+       int ret = platform_driver_register(&ifxmips_wdt_driver);
+       if (ret)
+               printk(KERN_INFO "ifxmips_wdt: error registering platfom driver!");
+       return ret;
+}
+
+static void __exit exit_ifxmips_wdt(void)
+{
+       platform_driver_unregister(&ifxmips_wdt_driver);
+}
+
+module_init(init_ifxmips_wdt);
+module_exit(exit_ifxmips_wdt);
+
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION("ifxmips Watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);