/*
- * 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 <asm-mips/ifxmips/ifxmips_cgu.h>
-#include <asm-mips/ifxmips/ifxmips.h>
-
-#define DRVNAME "ifxmips_wdt"
-
-// TODO remove magic numbers and weirdo macros
-extern unsigned int ifxmips_get_fpi_hz (void);
-
-static int ifxmips_wdt_inuse = 0;
-
-int
-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));
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
- 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);
+#include <asm/mach-ifxmips/cgu.h>
+#include <asm/ifxmips/ifxmips.h>
- ifxmips_w32(wdt_cr, IFXMIPS_BIU_WDT_CR);
+#define IFXMIPS_WDT_PW1 0x00BE0000
+#define IFXMIPS_WDT_PW2 0x00DC0000
- printk("watchdog enabled\n");
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+static int wdt_ok_to_close;
+#endif
-out:
- return retval;
-}
+static int wdt_timeout = 30;
-void
-ifxmips_wdt_disable (void)
+int ifxmips_wdt_enable(unsigned int timeout)
{
- 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");
+ 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;
}
-/* passed LPEN or DSEN */
-void
-ifxmips_wdt_enable_feature (int en, int type)
+void ifxmips_wdt_disable(void)
{
- unsigned int wdt_cr = 0;
-
- ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
-
- wdt_cr = ifxmips_r32(IFXMIPS_BIU_WDT_CR);
-
- if (en)
- {
- 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);
- }
-
- ifxmips_w32(wdt_cr, IFXMIPS_BIU_WDT_CR);
+#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);
}
-void
-ifxmips_wdt_prewarning_limit (int pwl)
+static ssize_t ifxmips_wdt_write(struct file *file, const char __user *data,
+ size_t len, loff_t *ppos)
{
- 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);
+ 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;
}
-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)
+static int 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;
- }
- }
-
- 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;
+ int ret = -ENOTTY;
- case IFXMIPS_WDT_IOC_PING:
- if (timeout < 0)
- result = -EIO;
- else
- result = ifxmips_wdt_enable(timeout);
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ ret = copy_to_user((struct watchdog_info __user *)arg, &ident,
+ sizeof(ident)) ? -EFAULT : 0;
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));
+ case WDIOC_GETTIMEOUT:
+ ret = put_user(wdt_timeout, (int __user *)arg);
break;
- case IFXMIPS_WDT_IOC_SET_PWL:
- ifxmips_wdt_prewarning_limit(user_arg);
+ case WDIOC_SETTIMEOUT:
+ ret = get_user(wdt_timeout, (int __user *)arg);
break;
- case IFXMIPS_WDT_IOC_SET_DSEN:
- ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_DSEN);
+ case WDIOC_KEEPALIVE:
+ ifxmips_wdt_enable(wdt_timeout);
+ ret = 0;
break;
-
- case IFXMIPS_WDT_IOC_SET_LPEN:
- ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_LPEN);
- break;
-
- case IFXMIPS_WDT_IOC_SET_CLKDIV:
- ifxmips_wdt_set_clkdiv(user_arg);
- 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)
+static int 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);
+ 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_ERR "ifxmips_wdt: 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)
+static int 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(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 *pdev)
+static int 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!");
+ 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);
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