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Commit d3710471 authored by Wim Van Sebroeck's avatar Wim Van Sebroeck
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[WATCHDOG] v2.6.5-rc2 pcwd.c-patch4 

Version 0.16 of pcwd.c - Changes that were made are:
* Changed the driver so that it uses an internal timer to do
  the actual watchdog pinging. This way the watchdog's emulated
  'heartbeat' is usuable as a module parameter. The watchdog's
  heartbeat can now vary from 2 till 7200 seconds

Tested on pcwd card with temperature option
parent 0fca96c5
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Showing with 108 additions and 34 deletions
drivers/char/watchdog/pcwd.c
View file @ d3710471
......@@ -53,6 +53,7 @@
#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>
......@@ -69,7 +70,7 @@
#include <asm/uaccess.h>
#include <asm/io.h>
#define WD_VER "1.15 (03/27/2004)"
#define WD_VER "1.16 (03/27/2004)"
#define PFX "pcwd: "
/*
......@@ -115,20 +116,36 @@
#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 int current_readport, revision, temp_panic;
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;
static int heartbeat;
/* 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
......@@ -204,18 +221,53 @@ static void unset_command_mode(void)
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)
{
if (stat_reg & 0x10) {
printk(KERN_INFO PFX "Could not start watchdog\n");
return -EIO;
}
......@@ -227,15 +279,19 @@ 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)
{
if ((stat_reg & 0x10) == 0) {
printk(KERN_INFO PFX "Could not stop watchdog\n");
return -EIO;
}
......@@ -243,19 +299,19 @@ static int pcwd_stop(void)
return 0;
}
static void pcwd_send_heartbeat(void)
static void pcwd_keepalive(void)
{
int wdrst_stat;
wdrst_stat = inb_p(current_readport);
wdrst_stat &= 0x0F;
/* user land ping */
next_heartbeat = jiffies + (heartbeat * HZ);
}
wdrst_stat |= WD_WDRST;
static int pcwd_set_heartbeat(int t)
{
if ((t < 2) || (t > 7200)) /* arbitrary upper limit */
return -EINVAL;
if (revision == PCWD_REVISION_A)
outb_p(wdrst_stat, current_readport + 1);
else
outb_p(wdrst_stat, current_readport);
heartbeat = t;
return 0;
}
static int pcwd_get_status(int *status)
......@@ -347,11 +403,12 @@ static int pcwd_ioctl(struct inode *inode, struct file *file,
int rv;
int status;
int temperature;
static struct watchdog_info ident=
{
int new_heartbeat;
static struct watchdog_info ident = {
.options = WDIOF_OVERHEAT |
WDIOF_CARDRESET |
WDIOF_KEEPALIVEPING |
WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "PCWD",
......@@ -403,9 +460,19 @@ static int pcwd_ioctl(struct inode *inode, struct file *file,
return -EINVAL;
case WDIOC_KEEPALIVE:
pcwd_send_heartbeat();
pcwd_keepalive();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_heartbeat, (int *) arg))
return -EFAULT;
if (pcwd_set_heartbeat(new_heartbeat))
return -EINVAL;
pcwd_keepalive();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(heartbeat, (int *)arg);
}
......@@ -436,7 +503,7 @@ static ssize_t pcwd_write(struct file *file, const char *buf, size_t len,
expect_close = 42;
}
}
pcwd_send_heartbeat();
pcwd_keepalive();
}
return len;
}
......@@ -453,6 +520,7 @@ static int pcwd_open(struct inode *inode, struct file *file)
/* Activate */
pcwd_start();
pcwd_keepalive();
return(0);
}
......@@ -463,7 +531,7 @@ static int pcwd_close(struct inode *inode, struct file *file)
atomic_inc( &open_allowed );
} else {
printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
pcwd_send_heartbeat();
pcwd_keepalive();
}
expect_close = 0;
return 0;
......@@ -651,7 +719,6 @@ static int __devinit pcwatchdog_init(int base_addr)
supports_temp = 0;
temp_panic = 0;
initial_status = 0x0000;
heartbeat = 0;
/* get the boot_status */
pcwd_get_status(&initial_status);
......@@ -659,6 +726,10 @@ static int __devinit pcwatchdog_init(int base_addr)
/* 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();
......@@ -674,20 +745,16 @@ static int __devinit pcwatchdog_init(int base_addr)
current_readport, firmware);
kfree(firmware);
option_switches = get_option_switches();
switch (option_switches & 0x07) {
case 0: heartbeat = 20; break;
case 1: heartbeat = 40; break;
case 2: heartbeat = 60; break;
case 3: heartbeat = 300; break;
case 4: heartbeat = 600; break;
case 5: heartbeat = 1800; break;
case 6: heartbeat = 3600; break;
case 7: heartbeat = 7200; break;
}
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");
......@@ -710,6 +777,13 @@ static int __devinit pcwatchdog_init(int base_addr)
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",
......
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