Commit a9e7da60 authored by Dave Jones's avatar Dave Jones Committed by Dave Jones

[WATCHDOG] Add several new watchdog drivers from 2.4

parent 7e218275
...@@ -283,4 +283,24 @@ config MACHZ_WDT ...@@ -283,4 +283,24 @@ config MACHZ_WDT
The module is called machzwd.o. If you want to compile it as a The module is called machzwd.o. If you want to compile it as a
module, say M here and read <file:Documentation/modules.txt>. module, say M here and read <file:Documentation/modules.txt>.
config W83877F_WDT
tristate "W83877F Computer Watchdog"
depends on WATCHDOG
config SC520_WDT
tristate "AMD Elan SC520 processor Watchdog"
depends on WATCHDOG
config ALIM7101_WDT
tristate "ALi M7101 PMU Computer Watchdog"
depends on WATCHDOG
config SC1200_WDT
tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog"
depends on WATCHDOG
config WAFER_WDT
tristate "ICP Wafer 5823 Single Board Computer Watchdog"
depends on WATCHDOG
endmenu endmenu
...@@ -23,3 +23,8 @@ obj-$(CONFIG_MACHZ_WDT) += machzwd.o ...@@ -23,3 +23,8 @@ obj-$(CONFIG_MACHZ_WDT) += machzwd.o
obj-$(CONFIG_SH_WDT) += shwdt.o obj-$(CONFIG_SH_WDT) += shwdt.o
obj-$(CONFIG_EUROTECH_WDT) += eurotechwdt.o obj-$(CONFIG_EUROTECH_WDT) += eurotechwdt.o
obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o
obj-$(CONFIG_SC520_WDT) += sc520_wdt.o
obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o
/*
* ALi M7101 PMU Computer Watchdog Timer driver for Linux 2.4.x
*
* Based on w83877f_wdt.c by Scott Jennings <management@oro.net>
* and the Cobalt kernel WDT timer driver by Tim Hockin
* <thockin@cobaltnet.com>
*
* (c)2002 Steve Hill <steve@navaho.co.uk>
*
* Theory of operation:
* A Watchdog Timer (WDT) is a hardware circuit that can
* reset the computer system in case of a software fault.
* You probably knew that already.
*
* Usually a userspace daemon will notify the kernel WDT driver
* via the /proc/watchdog special device file that userspace is
* still alive, at regular intervals. When such a notification
* occurs, the driver will usually tell the hardware watchdog
* that everything is in order, and that the watchdog should wait
* for yet another little while to reset the system.
* If userspace fails (RAM error, kernel bug, whatever), the
* notifications cease to occur, and the hardware watchdog will
* reset the system (causing a reboot) after the timeout occurs.
*
* This WDT driver is different from most other Linux WDT
* drivers in that the driver will ping the watchdog by itself,
* because this particular WDT has a very short timeout (1.6
* seconds) and it would be insane to count on any userspace
* daemon always getting scheduled within that time frame.
*/
#include <linux/module.h>
#include <linux/version.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <linux/smp_lock.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/pci.h>
#define OUR_NAME "alim7101_wdt"
#define WDT_ENABLE 0x9C
#define WDT_DISABLE 0x8C
#define ALI_7101_WDT 0x92
#define ALI_WDT_ARM 0x01
/*
* We're going to use a 1 second timeout.
* 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.
*/
#define WDT_HEARTBEAT (HZ * 30)
static void wdt_timer_ping(unsigned long);
static struct timer_list timer;
static unsigned long next_heartbeat;
static unsigned long wdt_is_open;
static int wdt_expect_close;
static struct pci_dev *alim7101_pmu;
/*
* 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
*/
char tmp;
if(time_before(jiffies, next_heartbeat))
{
/* Ping the WDT (this is actually a disarm/arm sequence) */
pci_read_config_byte(alim7101_pmu, 0x92, &tmp);
pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM));
} else {
printk(OUR_NAME ": Heartbeat lost! Will not ping the watchdog\n");
}
/* Re-set the timer interval */
timer.expires = jiffies + WDT_INTERVAL;
add_timer(&timer);
}
/*
* Utility routines
*/
static void wdt_change(int writeval)
{
char tmp;
pci_read_config_byte(alim7101_pmu, 0x92, &tmp);
if (writeval == WDT_ENABLE)
pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM));
else
pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
}
static void wdt_startup(void)
{
next_heartbeat = jiffies + WDT_HEARTBEAT;
/* We must enable before we kick off the timer in case the timer
occurs as we ping it */
wdt_change(WDT_ENABLE);
/* Start the timer */
timer.expires = jiffies + WDT_INTERVAL;
add_timer(&timer);
printk(OUR_NAME ": Watchdog timer is now enabled.\n");
}
static void wdt_turnoff(void)
{
/* Stop the timer */
del_timer_sync(&timer);
wdt_change(WDT_DISABLE);
printk(OUR_NAME ": Watchdog timer is now disabled...\n");
}
/*
* /dev/watchdog handling
*/
static ssize_t fop_write(struct file * file, const char * buf, size_t count, loff_t * ppos)
{
/* We can't seek */
if(ppos != &file->f_pos)
return -ESPIPE;
/* See if we got the magic character */
if(count)
{
size_t ofs;
/* note: just in case someone wrote the magic character
* five months ago... */
wdt_expect_close = 0;
/* now scan */
for(ofs = 0; ofs != count; ofs++)
{
char c;
if(get_user(c, buf+ofs))
return -EFAULT;
if(c == 'V')
wdt_expect_close = 1;
}
/* someone wrote to us, we should restart timer */
next_heartbeat = jiffies + WDT_HEARTBEAT;
return 1;
};
return 0;
}
static ssize_t fop_read(struct file * file, char * buf, size_t count, loff_t * ppos)
{
/* No can do */
return -EINVAL;
}
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;
/* Good, fire up the show */
wdt_startup();
return 0;
}
static int fop_close(struct inode * inode, struct file * file)
{
#ifdef CONFIG_WDT_NOWAYOUT
if(wdt_expect_close)
wdt_turnoff();
else {
printk(OUR_NAME ": device file closed unexpectedly. Will not stop the WDT!\n");
}
#else
wdt_turnoff();
#endif
clear_bit(0, &wdt_is_open);
return 0;
}
static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
static struct watchdog_info ident=
{
0,
1,
"ALiM7101"
};
switch(cmd)
{
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
case WDIOC_KEEPALIVE:
next_heartbeat = jiffies + WDT_HEARTBEAT;
return 0;
default:
return -ENOTTY;
}
}
static struct file_operations wdt_fops = {
.owner= THIS_MODULE,
.llseek= no_llseek,
.read= fop_read,
.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();
if (code==SYS_RESTART) {
/*
* Cobalt devices have no way of rebooting themselves other than
* getting the watchdog to pull reset, so we restart the watchdog on
* reboot with no heartbeat
*/
wdt_change(WDT_ENABLE);
printk(OUR_NAME ": Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second.\n");
};
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=
{
wdt_notify_sys,
0,
0
};
static void __exit alim7101_wdt_unload(void)
{
wdt_turnoff();
/* Deregister */
misc_deregister(&wdt_miscdev);
unregister_reboot_notifier(&wdt_notifier);
}
static int __init alim7101_wdt_init(void)
{
int rc = -EBUSY;
struct pci_dev *ali1543_south;
char tmp;
printk(KERN_INFO OUR_NAME ": Steve Hill <steve@navaho.co.uk>.\n");
alim7101_pmu = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101,NULL);
if (!alim7101_pmu) {
printk(KERN_INFO OUR_NAME ": ALi M7101 PMU not present - WDT not set\n");
return -EBUSY;
};
/* Set the WDT in the PMU to 1 second */
pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, 0x02);
ali1543_south = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
if (!ali1543_south) {
printk(KERN_INFO OUR_NAME ": ALi 1543 South-Bridge not present - WDT not set\n");
return -EBUSY;
};
pci_read_config_byte(ali1543_south, 0x5e, &tmp);
if ((tmp & 0x1e) != 0x12) {
printk(KERN_INFO OUR_NAME ": ALi 1543 South-Bridge does not have the correct revision number (???1001?) - WDT not set\n");
return -EBUSY;
};
init_timer(&timer);
timer.function = wdt_timer_ping;
timer.data = 1;
rc = misc_register(&wdt_miscdev);
if (rc)
return rc;
rc = register_reboot_notifier(&wdt_notifier);
if (rc) {
misc_deregister(&wdt_miscdev);
return rc;
};
printk(KERN_INFO OUR_NAME ": WDT driver for ALi M7101 initialised.\n");
return 0;
}
module_init(alim7101_wdt_init);
module_exit(alim7101_wdt_unload);
EXPORT_NO_SYMBOLS;
MODULE_AUTHOR("Steve Hill");
MODULE_LICENSE("GPL");
/*
* IndyDog 0.2 A Hardware Watchdog Device for SGI IP22
*
* (c) Copyright 2002 Guido Guenther <agx@sigxcpu.org>, All Rights Reserved.
*
* 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.
*
* based on softdog.c by Alan Cox <alan@redhat.com>
*/
#include <linux/module.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <asm/sgi/sgimc.h>
static unsigned long indydog_alive;
static struct sgimc_misc_ctrl *mcmisc_regs;
static void indydog_ping()
{
mcmisc_regs->watchdogt = 0;
}
/*
* Allow only one person to hold it open
*/
static int indydog_open(struct inode *inode, struct file *file)
{
u32 mc_ctrl0;
if( test_and_set_bit(0,&indydog_alive) )
return -EBUSY;
#ifdef CONFIG_WATCHDOG_NOWAYOUT
MOD_INC_USE_COUNT;
#endif
/*
* Activate timer
*/
mcmisc_regs = (struct sgimc_misc_ctrl *)(KSEG1+0x1fa00000);
mc_ctrl0 = mcmisc_regs->cpuctrl0 | SGIMC_CCTRL0_WDOG;
mcmisc_regs->cpuctrl0 = mc_ctrl0;
indydog_ping();
printk("Started watchdog timer.\n");
return 0;
}
static int indydog_release(struct inode *inode, struct file *file)
{
/*
* Shut off the timer.
* Lock it in if it's a module and we defined ...NOWAYOUT
*/
#ifndef CONFIG_WATCHDOG_NOWAYOUT
{
u32 mc_ctrl0 = mcmisc_regs->cpuctrl0;
mc_ctrl0 &= ~SGIMC_CCTRL0_WDOG;
mcmisc_regs->cpuctrl0 = mc_ctrl0;
printk("Stopped watchdog timer.\n");
}
#endif
clear_bit(0,&indydog_alive);
return 0;
}
static ssize_t indydog_write(struct file *file, const char *data, size_t len, loff_t *ppos)
{
/* Can't seek (pwrite) on this device */
if (ppos != &file->f_pos)
return -ESPIPE;
/*
* Refresh the timer.
*/
if(len) {
indydog_ping();
return 1;
}
return 0;
}
static int indydog_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
static struct watchdog_info ident = {
identity: "Hardware Watchdog for SGI IP22",
};
switch (cmd) {
default:
return -ENOIOCTLCMD;
case WDIOC_GETSUPPORT:
if(copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)))
return -EFAULT;
return 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0,(int *)arg);
case WDIOC_KEEPALIVE:
indydog_ping();
return 0;
}
}
static struct file_operations indydog_fops = {
.owner = THIS_MODULE,
.write = indydog_write,
.ioctl = indydog_ioctl,
.open = indydog_open,
.release= indydog_release,
};
static struct miscdevice indydog_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &indydog_fops,
};
static const char banner[] __initdata = KERN_INFO "Hardware Watchdog Timer for SGI IP22: 0.2\n";
static int __init watchdog_init(void)
{
int ret;
ret = misc_register(&indydog_miscdev);
if (ret)
return ret;
printk(banner);
return 0;
}
static void __exit watchdog_exit(void)
{
misc_deregister(&indydog_miscdev);
}
module_init(watchdog_init);
module_exit(watchdog_exit);
MODULE_LICENSE("GPL");
This diff is collapsed.
/*
* AMD Elan SC520 processor Watchdog Timer driver for Linux 2.4.x
*
* Based on acquirewdt.c by Alan Cox,
* and sbc60xxwdt.c by Jakob Oestergaard <jakob@ostenfeld.dk>
*
* 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 authors do 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 2001 Scott Jennings <linuxdrivers@oro.net>
* 9/27 - 2001 [Initial release]
*
* Additional fixes Alan Cox
* - Fixed formatting
* - Removed debug printks
* - Fixed SMP built kernel deadlock
* - Switched to private locks not lock_kernel
* - Used ioremap/writew/readw
* - Added NOWAYOUT support
*
* Theory of operation:
* A Watchdog Timer (WDT) is a hardware circuit that can
* reset the computer system in case of a software fault.
* You probably knew that already.
*
* Usually a userspace daemon will notify the kernel WDT driver
* via the /proc/watchdog special device file that userspace is
* still alive, at regular intervals. When such a notification
* occurs, the driver will usually tell the hardware watchdog
* that everything is in order, and that the watchdog should wait
* for yet another little while to reset the system.
* If userspace fails (RAM error, kernel bug, whatever), the
* notifications cease to occur, and the hardware watchdog will
* reset the system (causing a reboot) after the timeout occurs.
*
* This WDT driver is different from most other Linux WDT
* drivers in that the driver will ping the watchdog by itself,
* because this particular WDT has a very short timeout (1.6
* seconds) and it would be insane to count on any userspace
* daemon always getting scheduled within that time frame.
*
* This driver uses memory mapped IO, and spinlock.
*/
#include <linux/module.h>
#include <linux/version.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <linux/smp_lock.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
/*
* The SC520 can timeout anywhere from 492us to 32.21s.
* 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.
*/
#define WDT_HEARTBEAT (HZ * 30)
/*
* AMD Elan SC520 timeout value is 492us times a power of 2 (0-7)
*
* 0: 492us 2: 1.01s 4: 4.03s 6: 16.22s
* 1: 503ms 3: 2.01s 5: 8.05s 7: 32.21s
*/
#define TIMEOUT_EXPONENT ( 1 << 3 ) /* 0x08 = 2.01s */
/* #define MMCR_BASE_DEFAULT 0xfffef000 */
#define MMCR_BASE_DEFAULT ((__u16 *)0xffffe)
#define OFFS_WDTMRCTL ((unsigned int)0xcb0)
#define WDT_ENB 0x8000 /* [15] Watchdog Timer Enable */
#define WDT_WRST_ENB 0x4000 /* [14] Watchdog Timer Reset Enable */
#define OUR_NAME "sc520_wdt"
#define WRT_DOG(data) *wdtmrctl=data
static __u16 *wdtmrctl;
static void wdt_timer_ping(unsigned long);
static struct timer_list timer;
static unsigned long next_heartbeat;
static unsigned long wdt_is_open;
static int wdt_expect_close;
static spinlock_t wdt_spinlock;
/*
* 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 */
spin_lock(&wdt_spinlock);
writew(0xAAAA, wdtmrctl);
writew(0x5555, wdtmrctl);
spin_unlock(&wdt_spinlock);
/* Re-set the timer interval */
timer.expires = jiffies + WDT_INTERVAL;
add_timer(&timer);
} else {
printk(OUR_NAME ": Heartbeat lost! Will not ping the watchdog\n");
}
}
/*
* Utility routines
*/
static void wdt_config(int writeval)
{
__u16 dummy;
unsigned long flags;
/* buy some time (ping) */
spin_lock_irqsave(&wdt_spinlock, flags);
dummy=readw(wdtmrctl); /* ensure write synchronization */
writew(0xAAAA, wdtmrctl);
writew(0x5555, wdtmrctl);
/* make WDT configuration register writable one time */
writew(0x3333, wdtmrctl);
writew(0xCCCC, wdtmrctl);
/* write WDT configuration register */
writew(writeval, wdtmrctl);
spin_unlock_irqrestore(&wdt_spinlock, flags);
}
static void wdt_startup(void)
{
next_heartbeat = jiffies + WDT_HEARTBEAT;
/* Start the timer */
timer.expires = jiffies + WDT_INTERVAL;
add_timer(&timer);
wdt_config(WDT_ENB | WDT_WRST_ENB | TIMEOUT_EXPONENT);
printk(OUR_NAME ": Watchdog timer is now enabled.\n");
}
static void wdt_turnoff(void)
{
#ifndef CONFIG_WATCHDOG_NOWAYOUT
/* Stop the timer */
del_timer(&timer);
wdt_config(0);
printk(OUR_NAME ": Watchdog timer is now disabled...\n");
#endif
}
/*
* /dev/watchdog handling
*/
static ssize_t fop_write(struct file * file, const char * buf, size_t count, loff_t * ppos)
{
/* We can't seek */
if(ppos != &file->f_pos)
return -ESPIPE;
/* See if we got the magic character */
if(count)
{
size_t ofs;
/* note: just in case someone wrote the magic character
* five months ago... */
wdt_expect_close = 0;
/* now scan */
for(ofs = 0; ofs != count; ofs++) {
char c;
if (get_user(c, buf + ofs))
return -EFAULT;
if(c == 'V')
wdt_expect_close = 1;
}
/* Well, anyhow someone wrote to us, we should return that favour */
next_heartbeat = jiffies + WDT_HEARTBEAT;
return 1;
}
return 0;
}
static int fop_open(struct inode * inode, struct file * file)
{
switch(minor(inode->i_rdev))
{
case WATCHDOG_MINOR:
/* Just in case we're already talking to someone... */
if(test_and_set_bit(0, &wdt_is_open))
return -EBUSY;
/* Good, fire up the show */
wdt_startup();
#ifdef CONFIG_WATCHDOG_NOWAYOUT
MOD_INC_USE_COUNT;
#endif
return 0;
default:
return -ENODEV;
}
}
static int fop_close(struct inode * inode, struct file * file)
{
if(minor(inode->i_rdev) == WATCHDOG_MINOR)
{
if(wdt_expect_close)
wdt_turnoff();
else {
del_timer(&timer);
printk(OUR_NAME ": device file closed unexpectedly. Will not stop the WDT!\n");
}
}
clear_bit(0, &wdt_is_open);
return 0;
}
static long long fop_llseek(struct file *file, long long offset, int origin)
{
return -ESPIPE;
}
static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
static struct watchdog_info ident=
{
0,
1,
"SC520"
};
switch(cmd)
{
default:
return -ENOIOCTLCMD;
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
case WDIOC_KEEPALIVE:
next_heartbeat = jiffies + WDT_HEARTBEAT;
return 0;
}
}
static struct file_operations wdt_fops = {
owner: THIS_MODULE,
llseek: fop_llseek,
write: fop_write,
open: fop_open,
release: fop_close,
ioctl: fop_ioctl
};
static struct miscdevice wdt_miscdev = {
WATCHDOG_MINOR,
"watchdog",
&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=
{
wdt_notify_sys,
0,
0
};
static void __exit sc520_wdt_unload(void)
{
wdt_turnoff();
/* Deregister */
misc_deregister(&wdt_miscdev);
iounmap(wdtmrctl);
unregister_reboot_notifier(&wdt_notifier);
}
static int __init sc520_wdt_init(void)
{
int rc = -EBUSY;
unsigned long cbar;
spin_lock_init(&wdt_spinlock);
init_timer(&timer);
timer.function = wdt_timer_ping;
timer.data = 0;
rc = misc_register(&wdt_miscdev);
if (rc)
goto err_out_region2;
rc = register_reboot_notifier(&wdt_notifier);
if (rc)
goto err_out_miscdev;
/* get the Base Address Register */
cbar = inl_p(0xfffc);
printk(OUR_NAME ": CBAR: 0x%08lx\n", cbar);
/* check if MMCR aliasing bit is set */
if (cbar & 0x80000000) {
printk(OUR_NAME ": MMCR Aliasing enabled.\n");
wdtmrctl = (__u16 *)(cbar & 0x3fffffff);
} else {
printk(OUR_NAME "!!! WARNING !!!\n"
"\t MMCR Aliasing found NOT enabled!\n"
"\t Using default value of: %p\n"
"\t This has not been tested!\n"
"\t Please email Scott Jennings <smj@oro.net>\n"
"\t and Bill Jennings <bj@oro.net> if it works!\n"
, MMCR_BASE_DEFAULT
);
wdtmrctl = MMCR_BASE_DEFAULT;
}
wdtmrctl = (__u16 *)((char *)wdtmrctl + OFFS_WDTMRCTL);
wdtmrctl = ioremap((unsigned long)wdtmrctl, 2);
printk(KERN_INFO OUR_NAME ": WDT driver for SC520 initialised.\n");
return 0;
err_out_miscdev:
misc_deregister(&wdt_miscdev);
err_out_region2:
return rc;
}
module_init(sc520_wdt_init);
module_exit(sc520_wdt_unload);
MODULE_AUTHOR("Scott and Bill Jennings");
MODULE_DESCRIPTION("Driver for watchdog timer in AMD \"Elan\" SC520 uProcessor");
MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;
/*
* ICP Wafer 5823 Single Board Computer WDT driver for Linux 2.4.x
* http://www.icpamerica.com/wafer_5823.php
* May also work on other similar models
*
* (c) Copyright 2002 Justin Cormack <justin@street-vision.com>
*
* Release 0.02
*
* Based on advantechwdt.c which is based on wdt.c.
* Original copyright messages:
*
* (c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved.
* http://www.redhat.com
*
* 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.
*
* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
* warranty for any of this software. This material is provided
* "AS-IS" and at no charge.
*
* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/spinlock.h>
static unsigned long wafwdt_is_open;
static spinlock_t wafwdt_lock;
/*
* You must set these - there is no sane way to probe for this board.
*
* To enable, write the timeout value in seconds (1 to 255) to I/O
* port WDT_START, then read the port to start the watchdog. To pat
* the dog, read port WDT_STOP to stop the timer, then read WDT_START
* to restart it again.
*/
#define WDT_START 0x443
#define WDT_STOP 0x843
#define WD_TIMO 60 /* 1 minute */
static int wd_margin = WD_TIMO;
static void wafwdt_ping(void)
{
/* pat watchdog */
spin_lock(&wafwdt_lock);
inb_p(WDT_STOP);
inb_p(WDT_START);
spin_unlock(&wafwdt_lock);
}
static void wafwdt_start(void)
{
/* start up watchdog */
outb_p(wd_margin, WDT_START);
inb_p(WDT_START);
}
static void
wafwdt_stop(void)
{
/* stop watchdog */
inb_p(WDT_STOP);
}
static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, loff_t * ppos)
{
/* Can't seek (pwrite) on this device */
if (ppos != &file->f_pos)
return -ESPIPE;
if (count) {
wafwdt_ping();
return 1;
}
return 0;
}
static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
int new_margin;
static struct watchdog_info ident = {
WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
1, "Wafer 5823 WDT"
};
int one=1;
switch (cmd) {
case WDIOC_GETSUPPORT:
if (copy_to_user
((struct watchdog_info *) arg, &ident, sizeof (ident)))
return -EFAULT;
break;
case WDIOC_GETSTATUS:
if (copy_to_user((int *) arg, &one, sizeof (int)))
return -EFAULT;
break;
case WDIOC_KEEPALIVE:
wafwdt_ping();
break;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int *)arg))
return -EFAULT;
if ((new_margin < 1) || (new_margin > 255))
return -EINVAL;
wd_margin = new_margin;
wafwdt_stop();
wafwdt_start();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(wd_margin, (int *)arg);
default:
return -ENOTTY;
}
return 0;
}
static int wafwdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &wafwdt_is_open))
return -EBUSY;
wafwdt_start();
return 0;
}
static int
wafwdt_close(struct inode *inode, struct file *file)
{
clear_bit(0, &wafwdt_is_open);
#ifndef CONFIG_WATCHDOG_NOWAYOUT
wafwdt_stop();
#endif
return 0;
}
/*
* Notifier for system down
*/
static int wafwdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
{
if (code == SYS_DOWN || code == SYS_HALT) {
/* Turn the WDT off */
wafwdt_stop();
}
return NOTIFY_DONE;
}
/*
* Kernel Interfaces
*/
static struct file_operations wafwdt_fops = {
owner:THIS_MODULE,
write:wafwdt_write,
ioctl:wafwdt_ioctl,
open:wafwdt_open,
release:wafwdt_close,
};
static struct miscdevice wafwdt_miscdev = {
WATCHDOG_MINOR,
"watchdog",
&wafwdt_fops
};
/*
* The WDT needs to learn about soft shutdowns in order to
* turn the timebomb registers off.
*/
static struct notifier_block wafwdt_notifier = {
wafwdt_notify_sys,
NULL,
0
};
static int __init wafwdt_init(void)
{
printk(KERN_INFO "WDT driver for Wafer 5823 single board computer initialising.\n");
spin_lock_init(&wafwdt_lock);
if(!request_region(WDT_STOP, 1, "Wafer 5823 WDT"))
goto error;
if(!request_region(WDT_START, 1, "Wafer 5823 WDT"))
goto error2;
if(misc_register(&wafwdt_miscdev)<0)
goto error3;
register_reboot_notifier(&wafwdt_notifier);
return 0;
error3:
release_region(WDT_START, 1);
error2:
release_region(WDT_STOP, 1);
error:
return -ENODEV;
}
static void __exit wafwdt_exit(void)
{
misc_deregister(&wafwdt_miscdev);
unregister_reboot_notifier(&wafwdt_notifier);
release_region(WDT_STOP, 1);
release_region(WDT_START, 1);
}
module_init(wafwdt_init);
module_exit(wafwdt_exit);
MODULE_AUTHOR("Justin Cormack");
MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;
/* end of wafer5823wdt.c */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment