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yaml
---
r: 107839
b: refs/heads/master
c: ff94806
h: refs/heads/master
i:
  107837: 4ceee54
  107835: afe25ff
  107831: 9d89e5b
  107823: 45eaa5a
  107807: e75cbf9
  107775: b9fe7c2
v: v3
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Alan Cox authored and Wim Van Sebroeck committed Jun 21, 2008
1 parent fb55f3a commit 2f468aa
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Showing 2 changed files with 87 additions and 76 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: d14bccaadaa49b651fabcd1298b6ea07db3af552
refs/heads/master: ff94806057fba557abd6295f7313f5f9e972a48f
161 changes: 86 additions & 75 deletions trunk/drivers/watchdog/sc520_wdt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -64,9 +64,9 @@
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/io.h>
#include <linux/uaccess.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>

#define OUR_NAME "sc520_wdt"
Expand All @@ -91,13 +91,18 @@
*/

#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 */
/* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
static int timeout = WATCHDOG_TIMEOUT;
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
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) ")");
MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

/*
* AMD Elan SC520 - Watchdog Timer Registers
Expand Down Expand Up @@ -136,8 +141,7 @@ 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))
{
if (time_before(jiffies, next_heartbeat)) {
/* Ping the WDT */
spin_lock(&wdt_spinlock);
writew(0xAAAA, wdtmrctl);
Expand All @@ -146,9 +150,9 @@ static void wdt_timer_ping(unsigned long data)

/* Re-set the timer interval */
mod_timer(&timer, jiffies + WDT_INTERVAL);
} else {
printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
}
} else
printk(KERN_WARNING PFX
"Heartbeat lost! Will not ping the watchdog\n");
}

/*
Expand All @@ -162,7 +166,7 @@ static void wdt_config(int writeval)

/* buy some time (ping) */
spin_lock_irqsave(&wdt_spinlock, flags);
dummy=readw(wdtmrctl); /* ensure write synchronization */
dummy = readw(wdtmrctl); /* ensure write synchronization */
writew(0xAAAA, wdtmrctl);
writew(0x5555, wdtmrctl);
/* unlock WDT = make WDT configuration register writable one time */
Expand Down Expand Up @@ -219,10 +223,11 @@ static int wdt_set_heartbeat(int t)
* /dev/watchdog handling
*/

static ssize_t fop_write(struct file * file, const char __user * buf, size_t count, loff_t * ppos)
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 (count) {
if (!nowayout) {
size_t ofs;

Expand All @@ -231,25 +236,26 @@ static ssize_t fop_write(struct file * file, const char __user * buf, size_t cou
wdt_expect_close = 0;

/* now scan */
for(ofs = 0; ofs != count; ofs++) {
for (ofs = 0; ofs != count; ofs++) {
char c;
if (get_user(c, buf + ofs))
return -EFAULT;
if(c == 'V')
if (c == 'V')
wdt_expect_close = 42;
}
}

/* Well, anyhow someone wrote to us, we should return that favour */
/* 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)
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))
if (test_and_set_bit(0, &wdt_is_open))
return -EBUSY;
if (nowayout)
__module_get(THIS_MODULE);
Expand All @@ -259,76 +265,77 @@ static int fop_open(struct inode * inode, struct file * file)
return nonseekable_open(inode, file);
}

static int fop_close(struct inode * inode, struct file * file)
static int fop_close(struct inode *inode, struct file *file)
{
if(wdt_expect_close == 42) {
if (wdt_expect_close == 42)
wdt_turnoff();
} else {
printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
else {
printk(KERN_CRIT PFX
"Unexpected close, not stopping watchdog!\n");
wdt_keepalive();
}
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)
static int fop_ioctl(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,
static const struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
| WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "SC520",
};

switch(cmd)
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;
}
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(new_options & WDIOS_ENABLECARD) {
wdt_startup();
retval = 0;
}
if (get_user(new_options, p))
return -EFAULT;

if (new_options & WDIOS_DISABLECARD) {
wdt_turnoff();
retval = 0;
}

return retval;
if (new_options & WDIOS_ENABLECARD) {
wdt_startup();
retval = 0;
}
case WDIOC_SETTIMEOUT:
{
int new_timeout;

if(get_user(new_timeout, p))
return -EFAULT;
return retval;
}
case WDIOC_SETTIMEOUT:
{
int new_timeout;

if(wdt_set_heartbeat(new_timeout))
return -EINVAL;
if (get_user(new_timeout, p))
return -EFAULT;

wdt_keepalive();
/* Fall through */
}
case WDIOC_GETTIMEOUT:
return put_user(timeout, p);
if (wdt_set_heartbeat(new_timeout))
return -EINVAL;

wdt_keepalive();
/* Fall through */
}
case WDIOC_GETTIMEOUT:
return put_user(timeout, p);
}
}

Expand All @@ -354,7 +361,7 @@ static struct miscdevice wdt_miscdev = {
static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
if(code==SYS_DOWN || code==SYS_HALT)
if (code == SYS_DOWN || code == SYS_HALT)
wdt_turnoff();
return NOTIFY_DONE;
}
Expand Down Expand Up @@ -383,11 +390,13 @@ static int __init sc520_wdt_init(void)
{
int rc = -EBUSY;

/* Check that the timeout value is within it's range ; if not reset to the default */
/* Check that the timeout value is within it's range ;
if not reset to the default */
if (wdt_set_heartbeat(timeout)) {
wdt_set_heartbeat(WATCHDOG_TIMEOUT);
printk(KERN_INFO PFX "timeout value must be 1<=timeout<=3600, using %d\n",
WATCHDOG_TIMEOUT);
printk(KERN_INFO PFX
"timeout value must be 1 <= timeout <= 3600, using %d\n",
WATCHDOG_TIMEOUT);
}

wdtmrctl = ioremap((unsigned long)(MMCR_BASE + OFFS_WDTMRCTL), 2);
Expand All @@ -399,20 +408,22 @@ static int __init sc520_wdt_init(void)

rc = register_reboot_notifier(&wdt_notifier);
if (rc) {
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
rc);
printk(KERN_ERR PFX
"cannot register reboot notifier (err=%d)\n", rc);
goto err_out_ioremap;
}

rc = misc_register(&wdt_miscdev);
if (rc) {
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, rc);
printk(KERN_ERR PFX
"cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, rc);
goto err_out_notifier;
}

printk(KERN_INFO PFX "WDT driver for SC520 initialised. timeout=%d sec (nowayout=%d)\n",
timeout,nowayout);
printk(KERN_INFO PFX
"WDT driver for SC520 initialised. timeout=%d sec (nowayout=%d)\n",
timeout, nowayout);

return 0;

Expand Down

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