fixes ifxmips watchdog driver

SVN-Revision: 11602

1 files changed, 112 insertions, 230 deletions

diff --git a/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c b/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c
index a5ecb234e0..6228c6b05d 100644
--- a/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c
+++ b/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c
@@ -1,323 +1,205 @@
 /*
- *   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 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.
  *
- *   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) 2006 infineon
- *   Copyright (C) 2007 John Crispin <blogic@openwrt.org> 
+ * 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 <asm/uaccess.h>
-#include <linux/errno.h>
-#include <linux/proc_fs.h>
-#include <linux/ioctl.h>
 #include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/watchdog.h>
+#include <linux/fs.h>
 #include <linux/miscdevice.h>
-#include <asm-mips/ifxmips/ifxmips_wdt.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <asm/uaccess.h>
 #include <asm-mips/ifxmips/ifxmips_cgu.h>
 #include <asm-mips/ifxmips/ifxmips.h>
 
-#define DRVNAME			"ifxmips_wdt"
+#define IFXMIPS_WDT_PW1                  0x00BE0000
+#define IFXMIPS_WDT_PW2                  0x00DC0000
 
-// TODO remove magic numbers and weirdo macros
-extern unsigned int ifxmips_get_fpi_hz (void);
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+static int wdt_ok_to_close = 0;
+#endif
 
-static int ifxmips_wdt_inuse = 0;
+int wdt_timeout = 30;
 
 int
-ifxmips_wdt_enable (unsigned int timeout)
+ifxmips_wdt_enable(unsigned int timeout)
 {
-	unsigned int wdt_cr = 0;
-	unsigned int wdt_reload = 0;
-	unsigned int wdt_clkdiv, wdt_pwl, ffpi;
-	int retval = 0;
-
-	/* clock divider & prewarning limit */
-	wdt_clkdiv = 1 << (7 * IFXMIPS_BIU_WDT_CR_CLKDIV_GET(ifxmips_r32(IFXMIPS_BIU_WDT_CR)));
-	wdt_pwl = 0x8000 >> IFXMIPS_BIU_WDT_CR_PWL_GET(ifxmips_r32(IFXMIPS_BIU_WDT_CR));
-
-	ffpi = cgu_get_io_region_clock();
-	printk("cpu clock = %d\n", ffpi);
-
-	/* caculate reload value */
-	wdt_reload = (timeout * (ffpi / wdt_clkdiv)) + wdt_pwl;
-
-	printk(KERN_WARNING DRVNAME ": wdt_pwl=0x%x, wdt_clkdiv=%d, ffpi=%d, wdt_reload = 0x%x\n",
-		wdt_pwl, wdt_clkdiv, ffpi, wdt_reload);
-
-	if (wdt_reload > 0xFFFF)
-	{
-		printk(KERN_WARNING DRVNAME ": timeout too large %d\n", timeout);
-		retval = -EINVAL;
-		goto out;
-	}
-
-	/* Write first part of password access */
-	ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
-
-	wdt_cr = ifxmips_r32(IFXMIPS_BIU_WDT_CR);
-	wdt_cr &= (!IFXMIPS_BIU_WDT_CR_PW_SET(0xff) &
-		   !IFXMIPS_BIU_WDT_CR_PWL_SET(0x3) &
-		   !IFXMIPS_BIU_WDT_CR_CLKDIV_SET(0x3) &
-		   !IFXMIPS_BIU_WDT_CR_RELOAD_SET(0xffff));
-
-	wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) |
-		   IFXMIPS_BIU_WDT_CR_PWL_SET(IFXMIPS_BIU_WDT_CR_PWL_GET(ifxmips_r32(IFXMIPS_BIU_WDT_CR))) |
-		   IFXMIPS_BIU_WDT_CR_CLKDIV_SET(IFXMIPS_BIU_WDT_CR_CLKDIV_GET(ifxmips_r32(IFXMIPS_BIU_WDT_CR))) |
-		   IFXMIPS_BIU_WDT_CR_RELOAD_SET(wdt_reload) |
-		   IFXMIPS_BIU_WDT_CR_GEN);
-
-	ifxmips_w32(wdt_cr, IFXMIPS_BIU_WDT_CR);
-
-	printk("watchdog enabled\n");
-
-out:
-	return retval;
+	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)
+ifxmips_wdt_disable(void)
 {
-	ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
-	ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2), IFXMIPS_BIU_WDT_CR);
-
-	printk("watchdog disabled\n");
+#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);
 }
 
-/* passed LPEN or DSEN */
-void
-ifxmips_wdt_enable_feature (int en, int type)
+static ssize_t
+ifxmips_wdt_write(struct file *file, const char __user *data, size_t len,
+		 loff_t *ppos)
 {
-	unsigned int wdt_cr = 0;
+	size_t i;
 
-	ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
+	if(!len)
+		return 0;
 
-	wdt_cr = ifxmips_r32(IFXMIPS_BIU_WDT_CR);
-
-	if (en)
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	for(i = 0; i != len; i++)
 	{
-		wdt_cr &= (~IFXMIPS_BIU_WDT_CR_PW_SET(0xff));
-		wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | type);
-	} else {
-		wdt_cr &= (~IFXMIPS_BIU_WDT_CR_PW_SET(0xff) & ~type);
-		wdt_cr |= IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2);
+		char c;
+		if(get_user(c, data + i))
+			return -EFAULT;
+		if(c == 'V')
+			wdt_ok_to_close = 1;
 	}
-
-	ifxmips_w32(wdt_cr, IFXMIPS_BIU_WDT_CR);
-}
-
-void
-ifxmips_wdt_prewarning_limit (int pwl)
-{
-	unsigned int wdt_cr = 0;
-
-	wdt_cr = ifxmips_r32(IFXMIPS_BIU_WDT_CR);
-	ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
-
-	wdt_cr &= 0xf300ffff;
-	wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | IFXMIPS_BIU_WDT_CR_PWL_SET(pwl));
-
-	/* Set reload value in second password access */
-	ifxmips_w32(wdt_cr, IFXMIPS_BIU_WDT_CR);
+#endif
+	ifxmips_wdt_enable(wdt_timeout);
+	return len;
 }
 
-void
-ifxmips_wdt_set_clkdiv (int clkdiv)
-{
-	unsigned int wdt_cr = 0;
-
-	wdt_cr = ifxmips_r32(IFXMIPS_BIU_WDT_CR);
-	ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
-
-	wdt_cr &= 0xfc00ffff;
-	wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | IFXMIPS_BIU_WDT_CR_CLKDIV_SET(clkdiv));
-
-	/* Set reload value in second password access */
-	ifxmips_w32(wdt_cr, IFXMIPS_BIU_WDT_CR);
-}
+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)
+ifxmips_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+		 unsigned long arg)
 {
-	int result = 0;
-	static int timeout = -1;
-	unsigned int user_arg;
-
-	if ((cmd != IFXMIPS_WDT_IOC_STOP) && (cmd != IFXMIPS_WDT_IOC_PING) && (cmd != IFXMIPS_WDT_IOC_GET_STATUS))
-	{
-		if (copy_from_user((void *) &user_arg, (void *) arg, sizeof (int))){
-			result = -EINVAL;
-			goto out;
-		}
-	}
+	int ret = -ENOTTY;
 
-	switch (cmd)
+	switch(cmd)
 	{
-	case IFXMIPS_WDT_IOC_START:
-		if ((result = ifxmips_wdt_enable(user_arg)) < 0)
-			timeout = -1;
-		else
-			timeout = user_arg;
-		break;
-
-	case IFXMIPS_WDT_IOC_STOP:
-		printk(KERN_INFO DRVNAME ": disable watch dog timer\n");
-		ifxmips_wdt_disable();
-		break;
-
-	case IFXMIPS_WDT_IOC_PING:
-		if (timeout < 0)
-			result = -EIO;
-		else
-			result = ifxmips_wdt_enable(timeout);
-		break;
-
-	case IFXMIPS_WDT_IOC_GET_STATUS:
-		user_arg = ifxmips_r32(IFXMIPS_BIU_WDT_SR);
-		copy_to_user((int*)arg, (int*)&user_arg, sizeof(int));
-		break;
-
-	case IFXMIPS_WDT_IOC_SET_PWL:
-		ifxmips_wdt_prewarning_limit(user_arg);
+	case WDIOC_GETSUPPORT:
+		ret = copy_to_user((struct watchdog_info __user *)arg, &ident,
+				sizeof(ident)) ? -EFAULT : 0;
 		break;
 
-	case IFXMIPS_WDT_IOC_SET_DSEN:
-		ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_DSEN);
+	case WDIOC_GETTIMEOUT:
+		ret = put_user(wdt_timeout, (int __user *)arg);
 		break;
 
-	case IFXMIPS_WDT_IOC_SET_LPEN:
-		ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_LPEN);
+	case WDIOC_SETTIMEOUT:
+		ret = get_user(wdt_timeout, (int __user*)arg);
 		break;
 
-	case IFXMIPS_WDT_IOC_SET_CLKDIV:
-		ifxmips_wdt_set_clkdiv(user_arg);
+	case WDIOC_KEEPALIVE:
+		ifxmips_wdt_enable(wdt_timeout);
+		ret = 0;
 		break;
-
-	default:
-		printk(KERN_WARNING DRVNAME ": unknown watchdog iotcl\n");
 	}
-
-out:
-	return result;
+	return ret;
 }
 
 static int
-ifxmips_wdt_open (struct inode *inode, struct file *file)
+ifxmips_wdt_open(struct inode *inode, struct file *file)
 {
-	if (ifxmips_wdt_inuse)
-		return -EBUSY;
-
-	ifxmips_wdt_inuse = 1;
-
-	return 0;
+	ifxmips_wdt_enable(wdt_timeout);
+	printk("ifxmips_wdt: activated");
+	return nonseekable_open(inode, file);
 }
 
-static int
-ifxmips_wdt_release (struct inode *inode, struct file *file)
+static int ifxmips_wdt_release(struct inode *inode, struct file *file)
 {
-	ifxmips_wdt_inuse = 0;
-
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	if(wdt_ok_to_close)
+		ifxmips_wdt_disable();
+	else
+#endif
+		printk(KERN_INFO "watchdog closed without warning, rebooting system\n");
 	return 0;
 }
 
-int
-ifxmips_wdt_register_proc_read (char *buf, char **start, off_t offset, int count,
-			int *eof, void *data)
-{
-	int len = 0;
-
-	len += sprintf (buf + len, "IFXMIPS_BIU_WDT_PROC_READ\n");
-	len += sprintf (buf + len, "IFXMIPS_BIU_WDT_CR(0x%08x)	: 0x%08x\n",
-			(unsigned int)IFXMIPS_BIU_WDT_CR, ifxmips_r32(IFXMIPS_BIU_WDT_CR));
-	len += sprintf (buf + len, "IFXMIPS_BIU_WDT_SR(0x%08x)	: 0x%08x\n",
-			(unsigned int)IFXMIPS_BIU_WDT_SR, ifxmips_r32(IFXMIPS_BIU_WDT_SR));
-
-	*eof = 1;
-
-	return len;
-}
-
 static const struct file_operations ifxmips_wdt_fops = {
 	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
+	.write		= ifxmips_wdt_write,
 	.ioctl		= ifxmips_wdt_ioctl,
 	.open		= ifxmips_wdt_open,
 	.release	= ifxmips_wdt_release,
-//	.write		= at91_wdt_write,
 };
 
 static struct miscdevice ifxmips_wdt_miscdev = {
 	.minor		= WATCHDOG_MINOR,
-	.name		= "ifxmips_wdt",
+	.name		= "watchdog",
 	.fops		= &ifxmips_wdt_fops,
 };
 
-
 static int
-ifxmips_wdt_probe (struct platform_device *pdev)
+ifxmips_wdt_probe(struct platform_device *dev)
 {
-	int ret = misc_register(&ifxmips_wdt_miscdev);
-	if (ret)
-		return ret;
-
-	create_proc_read_entry(DRVNAME, 0, NULL, ifxmips_wdt_register_proc_read, NULL);
-
-	printk(KERN_INFO DRVNAME ": ifxmips watchdog loaded\n");
-
-	return 0;
+	int err;
+	err = misc_register(&ifxmips_wdt_miscdev);
+	if(err)
+		printk("ifxmips_wdt: error creating device\n");
+	else
+		printk("ifxmips_wdt: loaded\n");
+	return err;
 }
 
 static int
-ifxmips_wdt_remove (struct platform_device *pdev)
+ifxmips_wdt_remove(struct platform_device *dev)
 {
+	ifxmips_wdt_disable();
 	misc_deregister(&ifxmips_wdt_miscdev);
-	remove_proc_entry(DRVNAME, NULL);
 	return 0;
 }
 
-static struct
-platform_driver ifxmips_wdt_driver = {
+
+static struct platform_driver ifxmips_wdt_driver = {
 	.probe = ifxmips_wdt_probe,
 	.remove = ifxmips_wdt_remove,
 	.driver = {
-		.name = DRVNAME,
+		.name = "ifxmips_wdt",
 		.owner = THIS_MODULE,
 	},
 };
 
-int __init
-ifxmips_wdt_init_module (void)
+static int __init
+init_ifxmips_wdt(void)
 {
 	int ret = platform_driver_register(&ifxmips_wdt_driver);
-	if (ret)
-		printk(KERN_INFO DRVNAME ": Error registering platfom driver!");
+	if(ret)
+		printk(KERN_INFO "ifxmips_wdt: error registering platfom driver!");
 	return ret;
 }
 
-void
-ifxmips_wdt_cleanup_module (void)
+static void __exit
+exit_ifxmips_wdt(void)
 {
 	platform_driver_unregister(&ifxmips_wdt_driver);
 }
 
-module_init(ifxmips_wdt_init_module);
-module_exit(ifxmips_wdt_cleanup_module);
+module_init(init_ifxmips_wdt);
+module_exit(exit_ifxmips_wdt);
 
 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
-MODULE_DESCRIPTION("Watchdog driver for infineon ifxmips family");
+MODULE_DESCRIPTION("ifxmips Watchdog");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);