/*
* 60xx Single Board Computer Watchdog Timer driver for Linux 2.2.x
*
* Based on acquirewdt.c by Alan Cox.
*
* 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.
*
* The author does NOT admit liability nor provide warranty for
* any of this software. This material is provided "AS-IS" in
* the hope that it may be useful for others.
*
* (c) Copyright 2000 Jakob Oestergaard <jakob@unthought.net>
*
* 12/4 - 2000 [Initial revision]
* 25/4 - 2000 Added /dev/watchdog support
* 09/5 - 2001 [smj@oro.net] fixed fop_write to "return 1" on success
* 12/4 - 2002 [rob@osinvestor.com] eliminate fop_read
* fix possible wdt_is_open race
* add CONFIG_WATCHDOG_NOWAYOUT support
* remove lock_kernel/unlock_kernel pairs
* added KERN_* to printk's
* got rid of extraneous comments
* changed watchdog_info to correctly reflect what the driver offers
* added WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS, WDIOC_SETTIMEOUT,
* WDIOC_GETTIMEOUT, and WDIOC_SETOPTIONS ioctls
* 09/8 - 2003 [wim@iguana.be] cleanup of trailing spaces
* use module_param
* made timeout (the emulated heartbeat) a module_param
* made the keepalive ping an internal subroutine
* made wdt_stop and wdt_start module params
* added extra printk's for startup problems
* added MODULE_AUTHOR and MODULE_DESCRIPTION info
*
*
* This WDT driver is different from the other Linux WDT
* drivers in the following ways:
* *) The driver will ping the watchdog by itself, because this
* particular WDT has a very short timeout (one second) and it
* would be insane to count on any userspace daemon always
* getting scheduled within that time frame.
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/fs.h>
#include <linux/ioport.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#define OUR_NAME "sbc60xxwdt"
#define PFX OUR_NAME ": "
/*
* You must set these - The driver cannot probe for the settings
*/
static int wdt_stop = 0x45;
module_param(wdt_stop, int, 0);
MODULE_PARM_DESC(wdt_stop, "SBC60xx WDT 'stop' io port (default 0x45)");
static int wdt_start = 0x443;
module_param(wdt_start, int, 0);
MODULE_PARM_DESC(wdt_start, "SBC60xx WDT 'start' io port (default 0x443)");
/*
* The 60xx board can use watchdog timeout values from one second
* to several minutes. The default is one second, so if we reset
* the watchdog every ~250ms we should be safe.
*/
#define WDT_INTERVAL (HZ/4+1)
/*
* We must not require too good response from the userspace daemon.
* Here we require the userspace daemon to send us a heartbeat
* char to /dev/watchdog every 30 seconds.
* If the daemon pulses us every 25 seconds, we can still afford
* a 5 second scheduling delay on the (high priority) daemon. That
* should be sufficient for a box under any load.
*/
#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */
static int timeout = WATCHDOG_TIMEOUT; /* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static void wdt_timer_ping(unsigned long);
static DEFINE_TIMER(timer, wdt_timer_ping, 0, 0);
static unsigned long next_heartbeat;
static unsigned long wdt_is_open;
static char wdt_expect_close;
/*
* Whack the dog
*/
static void wdt_timer_ping(unsigned long data)
{
/* If we got a heartbeat pulse within the WDT_US_INTERVAL
* we agree to ping the WDT
*/
if(time_before(jiffies, next_heartbeat))
{
/* Ping the WDT by reading from wdt_start */
inb_p(wdt_start);
/* Re-set the timer interval */
mod_timer(&timer, jiffies + WDT_INTERVAL);
} else {
printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
}
}
/*
* Utility routines
*/
static void wdt_startup(void)
{
next_heartbeat = jiffies + (timeout * HZ);
/* Start the timer */
mod_timer(&timer, jiffies + WDT_INTERVAL);
printk(KERN_INFO PFX "Watchdog timer is now enabled.\n");
}
static void wdt_turnoff(void)
{
/* Stop the timer */
del_timer(&timer);
inb_p(wdt_stop);
printk(KERN_INFO PFX "Watchdog timer is now disabled...\n");
}
static void wdt_keepalive(void)
{
/* user land ping */
next_heartbeat = jiffies + (timeout * HZ);
}
/*
* /dev/watchdog handling
*/
static ssize_t fop_write(struct file * file, const char __user * buf, size_t count, loff_t * ppos)
{
/* See if we got the magic character 'V' and reload the timer */
if(count)
{
if (!nowayout)
{
size_t ofs;
/* note: just in case someone wrote the magic character
* five months ago... */
wdt_expect_close = 0;
/* scan to see whether or not we got the magic character */
for(ofs = 0; ofs != count; ofs++)
{
char c;
if(get_user(c, buf+ofs))
return -EFAULT;
if(c == 'V')
wdt_expect_close = 42;
}
}
/* Well, anyhow someone wrote to us, we should return that favour */
wdt_keepalive();
}
return count;
}
static int fop_open(struct inode * inode, struct file * file)
{
/* Just in case we're already talking to someone... */
if(test_and_set_bit(0, &wdt_is_open))
return -EBUSY;
if (nowayout)
__module_get(THIS_MODULE);
/* Good, fire up the show */
wdt_startup();
return nonseekable_open(inode, file);
}
static int fop_close(struct inode * inode, struct file * file)
{
if(wdt_expect_close == 42)
wdt_turnoff();
else {
del_timer(&timer);
printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT!\n");
}
clear_bit(0, &wdt_is_open);
wdt_expect_close = 0;
return 0;
}
static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
static struct watchdog_info ident=
{
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "SBC60xx",
};
switch(cmd)
{
default:
return -ENOTTY;
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_KEEPALIVE:
wdt_keepalive();
return 0;
case WDIOC_SETOPTIONS:
{
int new_options, retval = -EINVAL;
if(get_user(new_options, p))
return -EFAULT;
if(new_options & WDIOS_DISABLECARD) {
wdt_turnoff();
retval = 0;
}
if(new_options & WDIOS_ENABLECARD) {
wdt_startup();
retval = 0;
}
return retval;
}
case WDIOC_SETTIMEOUT:
{
int new_timeout;
if(get_user(new_timeout, p))
return -EFAULT;
if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
return -EINVAL;
timeout = new_timeout;
wdt_keepalive();
/* Fall through */
}
case WDIOC_GETTIMEOUT:
return put_user(timeout, p);
}
}
static const struct file_operations wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = fop_write,
.open = fop_open,
.release = fop_close,
.ioctl = fop_ioctl,
};
static struct miscdevice wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &wdt_fops,
};
/*
* Notifier for system down
*/
static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
if(code==SYS_DOWN || code==SYS_HALT)
wdt_turnoff();
return NOTIFY_DONE;
}
/*
* The WDT needs to learn about soft shutdowns in order to
* turn the timebomb registers off.
*/
static struct notifier_block wdt_notifier=
{
.notifier_call = wdt_notify_sys,
};
static void __exit sbc60xxwdt_unload(void)
{
wdt_turnoff();
/* Deregister */
misc_deregister(&wdt_miscdev);
unregister_reboot_notifier(&wdt_notifier);
if ((wdt_stop != 0x45) && (wdt_stop != wdt_start))
release_region(wdt_stop,1);
release_region(wdt_start,1);
}
static int __init sbc60xxwdt_init(void)
{
int rc = -EBUSY;
if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */
{
timeout = WATCHDOG_TIMEOUT;
printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n",
timeout);
}
if (!request_region(wdt_start, 1, "SBC 60XX WDT"))
{
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
wdt_start);
rc = -EIO;
goto err_out;
}
/* We cannot reserve 0x45 - the kernel already has! */
if ((wdt_stop != 0x45) && (wdt_stop != wdt_start))
{
if (!request_region(wdt_stop, 1, "SBC 60XX WDT"))
{
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
wdt_stop);
rc = -EIO;
goto err_out_region1;
}
}
rc = register_reboot_notifier(&wdt_notifier);
if (rc)
{
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
rc);
goto err_out_region2;
}
rc = misc_register(&wdt_miscdev);
if (rc)
{
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt_miscdev.minor, rc);
goto err_out_reboot;
}
printk(KERN_INFO PFX "WDT driver for 60XX single board computer initialised. timeout=%d sec (nowayout=%d)\n",
timeout, nowayout);
return 0;
err_out_reboot:
unregister_reboot_notifier(&wdt_notifier);
err_out_region2:
if ((wdt_stop != 0x45) && (wdt_stop != wdt_start))
release_region(wdt_stop,1);
err_out_region1:
release_region(wdt_start,1);
err_out:
return rc;
}
module_init(sbc60xxwdt_init);
module_exit(sbc60xxwdt_unload);
MODULE_AUTHOR("Jakob Oestergaard <jakob@unthought.net>");
MODULE_DESCRIPTION("60xx Single Board Computer Watchdog Timer driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
