[ifxmips] adss 2.6.33 kernel patches, not defult yet as linux-atm breaks on 2.6.33

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20789 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ifxmips/files-2.6.33/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);