2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* PC Watchdog Driver
|
|
|
|
* by Ken Hollis (khollis@bitgate.com)
|
|
|
|
*
|
|
|
|
* Permission granted from Simon Machell (73244.1270@compuserve.com)
|
|
|
|
* Written for the Linux Kernel, and GPLed by Ken Hollis
|
|
|
|
*
|
|
|
|
* 960107 Added request_region routines, modulized the whole thing.
|
|
|
|
* 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added
|
|
|
|
* WD_TIMEOUT define.
|
|
|
|
* 960216 Added eof marker on the file, and changed verbose messages.
|
|
|
|
* 960716 Made functional and cosmetic changes to the source for
|
|
|
|
* inclusion in Linux 2.0.x kernels, thanks to Alan Cox.
|
|
|
|
* 960717 Removed read/seek routines, replaced with ioctl. Also, added
|
|
|
|
* check_region command due to Alan's suggestion.
|
|
|
|
* 960821 Made changes to compile in newer 2.0.x kernels. Added
|
|
|
|
* "cold reboot sense" entry.
|
|
|
|
* 960825 Made a few changes to code, deleted some defines and made
|
|
|
|
* typedefs to replace them. Made heartbeat reset only available
|
|
|
|
* via ioctl, and removed the write routine.
|
|
|
|
* 960828 Added new items for PC Watchdog Rev.C card.
|
|
|
|
* 960829 Changed around all of the IOCTLs, added new features,
|
|
|
|
* added watchdog disable/re-enable routines. Added firmware
|
|
|
|
* version reporting. Added read routine for temperature.
|
|
|
|
* Removed some extra defines, added an autodetect Revision
|
|
|
|
* routine.
|
|
|
|
* 961006 Revised some documentation, fixed some cosmetic bugs. Made
|
|
|
|
* drivers to panic the system if it's overheating at bootup.
|
|
|
|
* 961118 Changed some verbiage on some of the output, tidied up
|
|
|
|
* code bits, and added compatibility to 2.1.x.
|
|
|
|
* 970912 Enabled board on open and disable on close.
|
|
|
|
* 971107 Took account of recent VFS changes (broke read).
|
|
|
|
* 971210 Disable board on initialisation in case board already ticking.
|
|
|
|
* 971222 Changed open/close for temperature handling
|
|
|
|
* Michael Meskes <meskes@debian.org>.
|
|
|
|
* 980112 Used minor numbers from include/linux/miscdevice.h
|
|
|
|
* 990403 Clear reset status after reading control status register in
|
|
|
|
* pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>]
|
|
|
|
* 990605 Made changes to code to support Firmware 1.22a, added
|
|
|
|
* fairly useless proc entry.
|
|
|
|
* 990610 removed said useless proc code for the merge <alan>
|
|
|
|
* 000403 Removed last traces of proc code. <davej>
|
|
|
|
* 011214 Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com>
|
|
|
|
* Added timeout module option to override default
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* A bells and whistles driver is available from http://www.pcwd.de/
|
|
|
|
* More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/moduleparam.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/timer.h>
|
|
|
|
#include <linux/jiffies.h>
|
|
|
|
#include <linux/config.h>
|
|
|
|
#include <linux/wait.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/ioport.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/fs.h>
|
|
|
|
#include <linux/miscdevice.h>
|
|
|
|
#include <linux/watchdog.h>
|
|
|
|
#include <linux/notifier.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <linux/reboot.h>
|
|
|
|
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
|
|
|
|
#define WD_VER "1.16 (06/12/2004)"
|
|
|
|
#define PFX "pcwd: "
|
|
|
|
|
|
|
|
/*
|
|
|
|
* It should be noted that PCWD_REVISION_B was removed because A and B
|
|
|
|
* are essentially the same types of card, with the exception that B
|
|
|
|
* has temperature reporting. Since I didn't receive a Rev.B card,
|
|
|
|
* the Rev.B card is not supported. (It's a good thing too, as they
|
|
|
|
* are no longer in production.)
|
|
|
|
*/
|
|
|
|
#define PCWD_REVISION_A 1
|
|
|
|
#define PCWD_REVISION_C 2
|
|
|
|
|
|
|
|
/*
|
|
|
|
* These are the defines that describe the control status bits for the
|
|
|
|
* PC Watchdog card, revision A.
|
|
|
|
*/
|
|
|
|
#define WD_WDRST 0x01 /* Previously reset state */
|
|
|
|
#define WD_T110 0x02 /* Temperature overheat sense */
|
|
|
|
#define WD_HRTBT 0x04 /* Heartbeat sense */
|
|
|
|
#define WD_RLY2 0x08 /* External relay triggered */
|
|
|
|
#define WD_SRLY2 0x80 /* Software external relay triggered */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* These are the defines that describe the control status bits for the
|
|
|
|
* PC Watchdog card, revision C.
|
|
|
|
*/
|
|
|
|
#define WD_REVC_WTRP 0x01 /* Watchdog Trip status */
|
|
|
|
#define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */
|
|
|
|
#define WD_REVC_TTRP 0x04 /* Temperature Trip status */
|
|
|
|
|
|
|
|
/* max. time we give an ISA watchdog card to process a command */
|
|
|
|
/* 500ms for each 4 bit response (according to spec.) */
|
|
|
|
#define ISA_COMMAND_TIMEOUT 1000
|
|
|
|
|
|
|
|
/* Watchdog's internal commands */
|
|
|
|
#define CMD_ISA_IDLE 0x00
|
|
|
|
#define CMD_ISA_VERSION_INTEGER 0x01
|
|
|
|
#define CMD_ISA_VERSION_TENTH 0x02
|
|
|
|
#define CMD_ISA_VERSION_HUNDRETH 0x03
|
|
|
|
#define CMD_ISA_VERSION_MINOR 0x04
|
|
|
|
#define CMD_ISA_SWITCH_SETTINGS 0x05
|
|
|
|
#define CMD_ISA_DELAY_TIME_2SECS 0x0A
|
|
|
|
#define CMD_ISA_DELAY_TIME_4SECS 0x0B
|
|
|
|
#define CMD_ISA_DELAY_TIME_8SECS 0x0C
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We are using an kernel timer to do the pinging of the watchdog
|
|
|
|
* every ~500ms. We try to set the internal heartbeat of the
|
|
|
|
* watchdog to 2 ms.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define WDT_INTERVAL (HZ/2+1)
|
|
|
|
|
|
|
|
/* We can only use 1 card due to the /dev/watchdog restriction */
|
|
|
|
static int cards_found;
|
|
|
|
|
|
|
|
/* internal variables */
|
|
|
|
static atomic_t open_allowed = ATOMIC_INIT(1);
|
|
|
|
static char expect_close;
|
|
|
|
static struct timer_list timer;
|
|
|
|
static unsigned long next_heartbeat;
|
|
|
|
static int temp_panic;
|
|
|
|
static int revision; /* The card's revision */
|
|
|
|
static int supports_temp; /* Wether or not the card has a temperature device */
|
|
|
|
static int command_mode; /* Wether or not the card is in command mode */
|
|
|
|
static int initial_status; /* The card's boot status */
|
|
|
|
static int current_readport; /* The cards I/O address */
|
|
|
|
static spinlock_t io_lock;
|
|
|
|
|
|
|
|
/* module parameters */
|
|
|
|
#define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */
|
|
|
|
static int heartbeat = WATCHDOG_HEARTBEAT;
|
|
|
|
module_param(heartbeat, int, 0);
|
|
|
|
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
|
|
|
|
|
|
|
|
#ifdef CONFIG_WATCHDOG_NOWAYOUT
|
|
|
|
static int nowayout = 1;
|
|
|
|
#else
|
|
|
|
static int nowayout = 0;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
module_param(nowayout, int, 0);
|
|
|
|
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Internal functions
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int send_isa_command(int cmd)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
int control_status;
|
|
|
|
int port0, last_port0; /* Double read for stabilising */
|
|
|
|
|
|
|
|
/* The WCMD bit must be 1 and the command is only 4 bits in size */
|
|
|
|
control_status = (cmd & 0x0F) | 0x80;
|
|
|
|
outb_p(control_status, current_readport + 2);
|
|
|
|
udelay(ISA_COMMAND_TIMEOUT);
|
|
|
|
|
|
|
|
port0 = inb_p(current_readport);
|
|
|
|
for (i = 0; i < 25; ++i) {
|
|
|
|
last_port0 = port0;
|
|
|
|
port0 = inb_p(current_readport);
|
|
|
|
|
|
|
|
if (port0 == last_port0)
|
|
|
|
break; /* Data is stable */
|
|
|
|
|
|
|
|
udelay (250);
|
|
|
|
}
|
|
|
|
|
|
|
|
return port0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int set_command_mode(void)
|
|
|
|
{
|
|
|
|
int i, found=0, count=0;
|
|
|
|
|
|
|
|
/* Set the card into command mode */
|
|
|
|
spin_lock(&io_lock);
|
|
|
|
while ((!found) && (count < 3)) {
|
|
|
|
i = send_isa_command(CMD_ISA_IDLE);
|
|
|
|
|
|
|
|
if (i == 0x00)
|
|
|
|
found = 1;
|
|
|
|
else if (i == 0xF3) {
|
|
|
|
/* Card does not like what we've done to it */
|
|
|
|
outb_p(0x00, current_readport + 2);
|
|
|
|
udelay(1200); /* Spec says wait 1ms */
|
|
|
|
outb_p(0x00, current_readport + 2);
|
|
|
|
udelay(ISA_COMMAND_TIMEOUT);
|
|
|
|
}
|
|
|
|
count++;
|
|
|
|
}
|
|
|
|
spin_unlock(&io_lock);
|
|
|
|
command_mode = found;
|
|
|
|
|
|
|
|
return(found);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void unset_command_mode(void)
|
|
|
|
{
|
|
|
|
/* Set the card into normal mode */
|
|
|
|
spin_lock(&io_lock);
|
|
|
|
outb_p(0x00, current_readport + 2);
|
|
|
|
udelay(ISA_COMMAND_TIMEOUT);
|
|
|
|
spin_unlock(&io_lock);
|
|
|
|
|
|
|
|
command_mode = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void pcwd_timer_ping(unsigned long data)
|
|
|
|
{
|
|
|
|
int wdrst_stat;
|
|
|
|
|
|
|
|
/* If we got a heartbeat pulse within the WDT_INTERVAL
|
|
|
|
* we agree to ping the WDT */
|
|
|
|
if(time_before(jiffies, next_heartbeat)) {
|
|
|
|
/* Ping the watchdog */
|
|
|
|
spin_lock(&io_lock);
|
|
|
|
if (revision == PCWD_REVISION_A) {
|
|
|
|
/* Rev A cards are reset by setting the WD_WDRST bit in register 1 */
|
|
|
|
wdrst_stat = inb_p(current_readport);
|
|
|
|
wdrst_stat &= 0x0F;
|
|
|
|
wdrst_stat |= WD_WDRST;
|
|
|
|
|
|
|
|
outb_p(wdrst_stat, current_readport + 1);
|
|
|
|
} else {
|
|
|
|
/* Re-trigger watchdog by writing to port 0 */
|
|
|
|
outb_p(0x00, current_readport);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Re-set the timer interval */
|
|
|
|
mod_timer(&timer, jiffies + WDT_INTERVAL);
|
|
|
|
|
|
|
|
spin_unlock(&io_lock);
|
|
|
|
} else {
|
|
|
|
printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_start(void)
|
|
|
|
{
|
|
|
|
int stat_reg;
|
|
|
|
|
|
|
|
next_heartbeat = jiffies + (heartbeat * HZ);
|
|
|
|
|
|
|
|
/* Start the timer */
|
|
|
|
mod_timer(&timer, jiffies + WDT_INTERVAL);
|
|
|
|
|
|
|
|
/* Enable the port */
|
|
|
|
if (revision == PCWD_REVISION_C) {
|
|
|
|
spin_lock(&io_lock);
|
|
|
|
outb_p(0x00, current_readport + 3);
|
|
|
|
udelay(ISA_COMMAND_TIMEOUT);
|
|
|
|
stat_reg = inb_p(current_readport + 2);
|
|
|
|
spin_unlock(&io_lock);
|
|
|
|
if (stat_reg & 0x10) {
|
|
|
|
printk(KERN_INFO PFX "Could not start watchdog\n");
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_stop(void)
|
|
|
|
{
|
|
|
|
int stat_reg;
|
|
|
|
|
|
|
|
/* Stop the timer */
|
|
|
|
del_timer(&timer);
|
|
|
|
|
|
|
|
/* Disable the board */
|
|
|
|
if (revision == PCWD_REVISION_C) {
|
|
|
|
spin_lock(&io_lock);
|
|
|
|
outb_p(0xA5, current_readport + 3);
|
|
|
|
udelay(ISA_COMMAND_TIMEOUT);
|
|
|
|
outb_p(0xA5, current_readport + 3);
|
|
|
|
udelay(ISA_COMMAND_TIMEOUT);
|
|
|
|
stat_reg = inb_p(current_readport + 2);
|
|
|
|
spin_unlock(&io_lock);
|
|
|
|
if ((stat_reg & 0x10) == 0) {
|
|
|
|
printk(KERN_INFO PFX "Could not stop watchdog\n");
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_keepalive(void)
|
|
|
|
{
|
|
|
|
/* user land ping */
|
|
|
|
next_heartbeat = jiffies + (heartbeat * HZ);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_set_heartbeat(int t)
|
|
|
|
{
|
|
|
|
if ((t < 2) || (t > 7200)) /* arbitrary upper limit */
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
heartbeat = t;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_get_status(int *status)
|
|
|
|
{
|
|
|
|
int card_status;
|
|
|
|
|
|
|
|
*status=0;
|
|
|
|
spin_lock(&io_lock);
|
|
|
|
if (revision == PCWD_REVISION_A)
|
|
|
|
/* Rev A cards return status information from
|
|
|
|
* the base register, which is used for the
|
|
|
|
* temperature in other cards. */
|
|
|
|
card_status = inb(current_readport);
|
|
|
|
else {
|
|
|
|
/* Rev C cards return card status in the base
|
|
|
|
* address + 1 register. And use different bits
|
|
|
|
* to indicate a card initiated reset, and an
|
|
|
|
* over-temperature condition. And the reboot
|
|
|
|
* status can be reset. */
|
|
|
|
card_status = inb(current_readport + 1);
|
|
|
|
}
|
|
|
|
spin_unlock(&io_lock);
|
|
|
|
|
|
|
|
if (revision == PCWD_REVISION_A) {
|
|
|
|
if (card_status & WD_WDRST)
|
|
|
|
*status |= WDIOF_CARDRESET;
|
|
|
|
|
|
|
|
if (card_status & WD_T110) {
|
|
|
|
*status |= WDIOF_OVERHEAT;
|
|
|
|
if (temp_panic) {
|
|
|
|
printk (KERN_INFO PFX "Temperature overheat trip!\n");
|
2005-07-26 20:03:08 +02:00
|
|
|
kernel_power_off();
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if (card_status & WD_REVC_WTRP)
|
|
|
|
*status |= WDIOF_CARDRESET;
|
|
|
|
|
|
|
|
if (card_status & WD_REVC_TTRP) {
|
|
|
|
*status |= WDIOF_OVERHEAT;
|
|
|
|
if (temp_panic) {
|
|
|
|
printk (KERN_INFO PFX "Temperature overheat trip!\n");
|
2005-07-26 20:03:08 +02:00
|
|
|
kernel_power_off();
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_clear_status(void)
|
|
|
|
{
|
|
|
|
if (revision == PCWD_REVISION_C) {
|
|
|
|
spin_lock(&io_lock);
|
|
|
|
outb_p(0x00, current_readport + 1); /* clear reset status */
|
|
|
|
spin_unlock(&io_lock);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_get_temperature(int *temperature)
|
|
|
|
{
|
|
|
|
/* check that port 0 gives temperature info and no command results */
|
|
|
|
if (command_mode)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
*temperature = 0;
|
|
|
|
if (!supports_temp)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Convert celsius to fahrenheit, since this was
|
|
|
|
* the decided 'standard' for this return value.
|
|
|
|
*/
|
|
|
|
spin_lock(&io_lock);
|
|
|
|
*temperature = ((inb(current_readport)) * 9 / 5) + 32;
|
|
|
|
spin_unlock(&io_lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* /dev/watchdog handling
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int pcwd_ioctl(struct inode *inode, struct file *file,
|
|
|
|
unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
int rv;
|
|
|
|
int status;
|
|
|
|
int temperature;
|
|
|
|
int new_heartbeat;
|
|
|
|
int __user *argp = (int __user *)arg;
|
|
|
|
static struct watchdog_info ident = {
|
|
|
|
.options = WDIOF_OVERHEAT |
|
|
|
|
WDIOF_CARDRESET |
|
|
|
|
WDIOF_KEEPALIVEPING |
|
|
|
|
WDIOF_SETTIMEOUT |
|
|
|
|
WDIOF_MAGICCLOSE,
|
|
|
|
.firmware_version = 1,
|
|
|
|
.identity = "PCWD",
|
|
|
|
};
|
|
|
|
|
|
|
|
switch(cmd) {
|
|
|
|
default:
|
|
|
|
return -ENOIOCTLCMD;
|
|
|
|
|
|
|
|
case WDIOC_GETSUPPORT:
|
|
|
|
if(copy_to_user(argp, &ident, sizeof(ident)))
|
|
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
case WDIOC_GETSTATUS:
|
|
|
|
pcwd_get_status(&status);
|
|
|
|
return put_user(status, argp);
|
|
|
|
|
|
|
|
case WDIOC_GETBOOTSTATUS:
|
|
|
|
return put_user(initial_status, argp);
|
|
|
|
|
|
|
|
case WDIOC_GETTEMP:
|
|
|
|
if (pcwd_get_temperature(&temperature))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
return put_user(temperature, argp);
|
|
|
|
|
|
|
|
case WDIOC_SETOPTIONS:
|
|
|
|
if (revision == PCWD_REVISION_C)
|
|
|
|
{
|
|
|
|
if(copy_from_user(&rv, argp, sizeof(int)))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
if (rv & WDIOS_DISABLECARD)
|
|
|
|
{
|
|
|
|
return pcwd_stop();
|
|
|
|
}
|
|
|
|
|
|
|
|
if (rv & WDIOS_ENABLECARD)
|
|
|
|
{
|
|
|
|
return pcwd_start();
|
|
|
|
}
|
|
|
|
|
|
|
|
if (rv & WDIOS_TEMPPANIC)
|
|
|
|
{
|
|
|
|
temp_panic = 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
case WDIOC_KEEPALIVE:
|
|
|
|
pcwd_keepalive();
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
case WDIOC_SETTIMEOUT:
|
|
|
|
if (get_user(new_heartbeat, argp))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
if (pcwd_set_heartbeat(new_heartbeat))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
pcwd_keepalive();
|
|
|
|
/* Fall */
|
|
|
|
|
|
|
|
case WDIOC_GETTIMEOUT:
|
|
|
|
return put_user(heartbeat, argp);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len,
|
|
|
|
loff_t *ppos)
|
|
|
|
{
|
|
|
|
if (len) {
|
|
|
|
if (!nowayout) {
|
|
|
|
size_t i;
|
|
|
|
|
|
|
|
/* In case it was set long ago */
|
|
|
|
expect_close = 0;
|
|
|
|
|
|
|
|
for (i = 0; i != len; i++) {
|
|
|
|
char c;
|
|
|
|
|
|
|
|
if (get_user(c, buf + i))
|
|
|
|
return -EFAULT;
|
|
|
|
if (c == 'V')
|
|
|
|
expect_close = 42;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
pcwd_keepalive();
|
|
|
|
}
|
|
|
|
return len;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
if (!atomic_dec_and_test(&open_allowed) ) {
|
|
|
|
atomic_inc( &open_allowed );
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (nowayout)
|
|
|
|
__module_get(THIS_MODULE);
|
|
|
|
|
|
|
|
/* Activate */
|
|
|
|
pcwd_start();
|
|
|
|
pcwd_keepalive();
|
|
|
|
return nonseekable_open(inode, file);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_close(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
if (expect_close == 42) {
|
|
|
|
pcwd_stop();
|
|
|
|
} else {
|
|
|
|
printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
|
|
|
|
pcwd_keepalive();
|
|
|
|
}
|
|
|
|
expect_close = 0;
|
|
|
|
atomic_inc( &open_allowed );
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* /dev/temperature handling
|
|
|
|
*/
|
|
|
|
|
|
|
|
static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count,
|
|
|
|
loff_t *ppos)
|
|
|
|
{
|
|
|
|
int temperature;
|
|
|
|
|
|
|
|
if (pcwd_get_temperature(&temperature))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
if (copy_to_user(buf, &temperature, 1))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_temp_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
if (!supports_temp)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
return nonseekable_open(inode, file);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcwd_temp_close(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Notify system
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
|
|
|
|
{
|
|
|
|
if (code==SYS_DOWN || code==SYS_HALT) {
|
|
|
|
/* Turn the WDT off */
|
|
|
|
pcwd_stop();
|
|
|
|
}
|
|
|
|
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Kernel Interfaces
|
|
|
|
*/
|
|
|
|
|
|
|
|
static struct file_operations pcwd_fops = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.llseek = no_llseek,
|
|
|
|
.write = pcwd_write,
|
|
|
|
.ioctl = pcwd_ioctl,
|
|
|
|
.open = pcwd_open,
|
|
|
|
.release = pcwd_close,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice pcwd_miscdev = {
|
|
|
|
.minor = WATCHDOG_MINOR,
|
|
|
|
.name = "watchdog",
|
|
|
|
.fops = &pcwd_fops,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct file_operations pcwd_temp_fops = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.llseek = no_llseek,
|
|
|
|
.read = pcwd_temp_read,
|
|
|
|
.open = pcwd_temp_open,
|
|
|
|
.release = pcwd_temp_close,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice temp_miscdev = {
|
|
|
|
.minor = TEMP_MINOR,
|
|
|
|
.name = "temperature",
|
|
|
|
.fops = &pcwd_temp_fops,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct notifier_block pcwd_notifier = {
|
|
|
|
.notifier_call = pcwd_notify_sys,
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Init & exit routines
|
|
|
|
*/
|
|
|
|
|
|
|
|
static inline void get_support(void)
|
|
|
|
{
|
|
|
|
if (inb(current_readport) != 0xF0)
|
|
|
|
supports_temp = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int get_revision(void)
|
|
|
|
{
|
|
|
|
int r = PCWD_REVISION_C;
|
|
|
|
|
|
|
|
spin_lock(&io_lock);
|
|
|
|
/* REV A cards use only 2 io ports; test
|
|
|
|
* presumes a floating bus reads as 0xff. */
|
|
|
|
if ((inb(current_readport + 2) == 0xFF) ||
|
|
|
|
(inb(current_readport + 3) == 0xFF))
|
|
|
|
r=PCWD_REVISION_A;
|
|
|
|
spin_unlock(&io_lock);
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline char *get_firmware(void)
|
|
|
|
{
|
|
|
|
int one, ten, hund, minor;
|
|
|
|
char *ret;
|
|
|
|
|
|
|
|
ret = kmalloc(6, GFP_KERNEL);
|
|
|
|
if(ret == NULL)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
if (set_command_mode()) {
|
|
|
|
one = send_isa_command(CMD_ISA_VERSION_INTEGER);
|
|
|
|
ten = send_isa_command(CMD_ISA_VERSION_TENTH);
|
|
|
|
hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH);
|
|
|
|
minor = send_isa_command(CMD_ISA_VERSION_MINOR);
|
|
|
|
sprintf(ret, "%c.%c%c%c", one, ten, hund, minor);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
sprintf(ret, "ERROR");
|
|
|
|
|
|
|
|
unset_command_mode();
|
|
|
|
return(ret);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int get_option_switches(void)
|
|
|
|
{
|
|
|
|
int rv=0;
|
|
|
|
|
|
|
|
if (set_command_mode()) {
|
|
|
|
/* Get switch settings */
|
|
|
|
rv = send_isa_command(CMD_ISA_SWITCH_SETTINGS);
|
|
|
|
}
|
|
|
|
|
|
|
|
unset_command_mode();
|
|
|
|
return(rv);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __devinit pcwatchdog_init(int base_addr)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
char *firmware;
|
|
|
|
int option_switches;
|
|
|
|
|
|
|
|
cards_found++;
|
|
|
|
if (cards_found == 1)
|
|
|
|
printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER);
|
|
|
|
|
|
|
|
if (cards_found > 1) {
|
|
|
|
printk(KERN_ERR PFX "This driver only supports 1 device\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (base_addr == 0x0000) {
|
|
|
|
printk(KERN_ERR PFX "No I/O-Address for card detected\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
current_readport = base_addr;
|
|
|
|
|
|
|
|
/* Check card's revision */
|
|
|
|
revision = get_revision();
|
|
|
|
|
|
|
|
if (!request_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
|
|
|
|
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
|
|
|
|
current_readport);
|
|
|
|
current_readport = 0x0000;
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Initial variables */
|
|
|
|
supports_temp = 0;
|
|
|
|
temp_panic = 0;
|
|
|
|
initial_status = 0x0000;
|
|
|
|
|
|
|
|
/* get the boot_status */
|
|
|
|
pcwd_get_status(&initial_status);
|
|
|
|
|
|
|
|
/* clear the "card caused reboot" flag */
|
|
|
|
pcwd_clear_status();
|
|
|
|
|
|
|
|
init_timer(&timer);
|
|
|
|
timer.function = pcwd_timer_ping;
|
|
|
|
timer.data = 0;
|
|
|
|
|
|
|
|
/* Disable the board */
|
|
|
|
pcwd_stop();
|
|
|
|
|
|
|
|
/* Check whether or not the card supports the temperature device */
|
|
|
|
get_support();
|
|
|
|
|
|
|
|
/* Get some extra info from the hardware (in command/debug/diag mode) */
|
|
|
|
if (revision == PCWD_REVISION_A)
|
|
|
|
printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", current_readport);
|
|
|
|
else if (revision == PCWD_REVISION_C) {
|
|
|
|
firmware = get_firmware();
|
|
|
|
printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",
|
|
|
|
current_readport, firmware);
|
|
|
|
kfree(firmware);
|
|
|
|
option_switches = get_option_switches();
|
|
|
|
printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
|
|
|
|
option_switches,
|
|
|
|
((option_switches & 0x10) ? "ON" : "OFF"),
|
|
|
|
((option_switches & 0x08) ? "ON" : "OFF"));
|
|
|
|
|
|
|
|
/* Reprogram internal heartbeat to 2 seconds */
|
|
|
|
if (set_command_mode()) {
|
|
|
|
send_isa_command(CMD_ISA_DELAY_TIME_2SECS);
|
|
|
|
unset_command_mode();
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* Should NEVER happen, unless get_revision() fails. */
|
|
|
|
printk(KERN_INFO PFX "Unable to get revision\n");
|
|
|
|
release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
|
|
|
|
current_readport = 0x0000;
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (supports_temp)
|
|
|
|
printk(KERN_INFO PFX "Temperature Option Detected\n");
|
|
|
|
|
|
|
|
if (initial_status & WDIOF_CARDRESET)
|
|
|
|
printk(KERN_INFO PFX "Previous reboot was caused by the card\n");
|
|
|
|
|
|
|
|
if (initial_status & WDIOF_OVERHEAT) {
|
|
|
|
printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n");
|
|
|
|
printk(KERN_EMERG PFX "CPU Overheat\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
if (initial_status == 0)
|
|
|
|
printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
|
|
|
|
|
|
|
|
/* Check that the heartbeat value is within it's range ; if not reset to the default */
|
|
|
|
if (pcwd_set_heartbeat(heartbeat)) {
|
|
|
|
pcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
|
|
|
|
printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n",
|
|
|
|
WATCHDOG_HEARTBEAT);
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = register_reboot_notifier(&pcwd_notifier);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
|
|
|
|
ret);
|
|
|
|
release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
|
|
|
|
current_readport = 0x0000;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (supports_temp) {
|
|
|
|
ret = misc_register(&temp_miscdev);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
|
|
|
|
TEMP_MINOR, ret);
|
|
|
|
unregister_reboot_notifier(&pcwd_notifier);
|
|
|
|
release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
|
|
|
|
current_readport = 0x0000;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = misc_register(&pcwd_miscdev);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
|
|
|
|
WATCHDOG_MINOR, ret);
|
|
|
|
if (supports_temp)
|
|
|
|
misc_deregister(&temp_miscdev);
|
|
|
|
unregister_reboot_notifier(&pcwd_notifier);
|
|
|
|
release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
|
|
|
|
current_readport = 0x0000;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
|
|
|
|
heartbeat, nowayout);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __devexit pcwatchdog_exit(void)
|
|
|
|
{
|
|
|
|
/* Disable the board */
|
|
|
|
if (!nowayout)
|
|
|
|
pcwd_stop();
|
|
|
|
|
|
|
|
/* Deregister */
|
|
|
|
misc_deregister(&pcwd_miscdev);
|
|
|
|
if (supports_temp)
|
|
|
|
misc_deregister(&temp_miscdev);
|
|
|
|
unregister_reboot_notifier(&pcwd_notifier);
|
|
|
|
release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
|
|
|
|
current_readport = 0x0000;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The ISA cards have a heartbeat bit in one of the registers, which
|
|
|
|
* register is card dependent. The heartbeat bit is monitored, and if
|
|
|
|
* found, is considered proof that a Berkshire card has been found.
|
|
|
|
* The initial rate is once per second at board start up, then twice
|
|
|
|
* per second for normal operation.
|
|
|
|
*/
|
|
|
|
static int __init pcwd_checkcard(int base_addr)
|
|
|
|
{
|
|
|
|
int port0, last_port0; /* Reg 0, in case it's REV A */
|
|
|
|
int port1, last_port1; /* Register 1 for REV C cards */
|
|
|
|
int i;
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
if (!request_region (base_addr, 4, "PCWD")) {
|
|
|
|
printk (KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
retval = 0;
|
|
|
|
|
|
|
|
port0 = inb_p(base_addr); /* For REV A boards */
|
|
|
|
port1 = inb_p(base_addr + 1); /* For REV C boards */
|
|
|
|
if (port0 != 0xff || port1 != 0xff) {
|
|
|
|
/* Not an 'ff' from a floating bus, so must be a card! */
|
|
|
|
for (i = 0; i < 4; ++i) {
|
|
|
|
|
|
|
|
msleep(500);
|
|
|
|
|
|
|
|
last_port0 = port0;
|
|
|
|
last_port1 = port1;
|
|
|
|
|
|
|
|
port0 = inb_p(base_addr);
|
|
|
|
port1 = inb_p(base_addr + 1);
|
|
|
|
|
|
|
|
/* Has either hearbeat bit changed? */
|
|
|
|
if ((port0 ^ last_port0) & WD_HRTBT ||
|
|
|
|
(port1 ^ last_port1) & WD_REVC_HRBT) {
|
|
|
|
retval = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
release_region (base_addr, 4);
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* These are the auto-probe addresses available.
|
|
|
|
*
|
|
|
|
* Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350.
|
|
|
|
* Revision A has an address range of 2 addresses, while Revision C has 4.
|
|
|
|
*/
|
|
|
|
static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };
|
|
|
|
|
|
|
|
static int __init pcwd_init_module(void)
|
|
|
|
{
|
|
|
|
int i, found = 0;
|
|
|
|
|
|
|
|
spin_lock_init(&io_lock);
|
|
|
|
|
|
|
|
for (i = 0; pcwd_ioports[i] != 0; i++) {
|
|
|
|
if (pcwd_checkcard(pcwd_ioports[i])) {
|
|
|
|
if (!(pcwatchdog_init(pcwd_ioports[i])))
|
|
|
|
found++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!found) {
|
|
|
|
printk (KERN_INFO PFX "No card detected, or port not available\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit pcwd_cleanup_module(void)
|
|
|
|
{
|
|
|
|
if (current_readport)
|
|
|
|
pcwatchdog_exit();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(pcwd_init_module);
|
|
|
|
module_exit(pcwd_cleanup_module);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>");
|
|
|
|
MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
|
|
MODULE_ALIAS_MISCDEV(TEMP_MINOR);
|