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yaml
---
r: 107819
b: refs/heads/master
c: f4fabce
h: refs/heads/master
i:
  107817: 6bd5f93
  107815: 049015f
v: v3
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Alan Cox authored and Wim Van Sebroeck committed Jun 13, 2008
1 parent ce41932 commit 1615775
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Showing 2 changed files with 63 additions and 58 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: 20d35f3e50ea7e573f9568b9fce4e98523aaee5d
refs/heads/master: f4fabce15bb9b547f934e2b6f0e5e01044108e4d
119 changes: 62 additions & 57 deletions trunk/drivers/watchdog/ks8695_wdt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,8 +19,8 @@
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <asm/arch/regs-timer.h>


Expand All @@ -31,38 +31,44 @@ static int wdt_time = WDT_DEFAULT_TIME;
static int nowayout = WATCHDOG_NOWAYOUT;

module_param(wdt_time, int, 0);
MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="__MODULE_STRING(WDT_DEFAULT_TIME) ")");
MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
__MODULE_STRING(WDT_DEFAULT_TIME) ")");

#ifdef CONFIG_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) ")");
#endif


static unsigned long ks8695wdt_busy;
static spinlock_t ks8695_lock;

/* ......................................................................... */

/*
* Disable the watchdog.
*/
static void inline ks8695_wdt_stop(void)
static inline void ks8695_wdt_stop(void)
{
unsigned long tmcon;

spin_lock(&ks8695_lock);
/* disable timer0 */
tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
spin_unlock(&ks8695_lock);
}

/*
* Enable and reset the watchdog.
*/
static void inline ks8695_wdt_start(void)
static inline void ks8695_wdt_start(void)
{
unsigned long tmcon;
unsigned long tval = wdt_time * CLOCK_TICK_RATE;

spin_lock(&ks8695_lock);
/* disable timer0 */
tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
Expand All @@ -73,19 +79,22 @@ static void inline ks8695_wdt_start(void)
/* re-enable timer0 */
tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
__raw_writel(tmcon | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
spin_unlock(&ks8695_lock);
}

/*
* Reload the watchdog timer. (ie, pat the watchdog)
*/
static void inline ks8695_wdt_reload(void)
static inline void ks8695_wdt_reload(void)
{
unsigned long tmcon;

spin_lock(&ks8695_lock);
/* disable, then re-enable timer0 */
tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
__raw_writel(tmcon | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
spin_unlock(&ks8695_lock);
}

/*
Expand All @@ -102,7 +111,8 @@ static int ks8695_wdt_settimeout(int new_time)
if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
return -EINVAL;

/* Set new watchdog time. It will be used when ks8695_wdt_start() is called. */
/* Set new watchdog time. It will be used when
ks8695_wdt_start() is called. */
wdt_time = new_time;
return 0;
}
Expand All @@ -128,9 +138,9 @@ static int ks8695_wdt_open(struct inode *inode, struct file *file)
*/
static int ks8695_wdt_close(struct inode *inode, struct file *file)
{
/* Disable the watchdog when file is closed */
if (!nowayout)
ks8695_wdt_stop(); /* Disable the watchdog when file is closed */

ks8695_wdt_stop();
clear_bit(0, &ks8695wdt_busy);
return 0;
}
Expand All @@ -143,60 +153,52 @@ static struct watchdog_info ks8695_wdt_info = {
/*
* Handle commands from user-space.
*/
static int ks8695_wdt_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
static long ks8695_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_value;

switch(cmd) {
case WDIOC_KEEPALIVE:
ks8695_wdt_reload(); /* pat the watchdog */
return 0;

case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ks8695_wdt_info, sizeof(ks8695_wdt_info)) ? -EFAULT : 0;

case WDIOC_SETTIMEOUT:
if (get_user(new_value, p))
return -EFAULT;

if (ks8695_wdt_settimeout(new_value))
return -EINVAL;

/* Enable new time value */
switch (cmd) {
case WDIOC_KEEPALIVE:
ks8695_wdt_reload(); /* pat the watchdog */
return 0;
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ks8695_wdt_info,
sizeof(ks8695_wdt_info)) ? -EFAULT : 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_value, p))
return -EFAULT;
if (ks8695_wdt_settimeout(new_value))
return -EINVAL;
/* Enable new time value */
ks8695_wdt_start();
/* Return current value */
return put_user(wdt_time, p);
case WDIOC_GETTIMEOUT:
return put_user(wdt_time, p);
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_SETOPTIONS:
if (get_user(new_value, p))
return -EFAULT;
if (new_value & WDIOS_DISABLECARD)
ks8695_wdt_stop();
if (new_value & WDIOS_ENABLECARD)
ks8695_wdt_start();

/* Return current value */
return put_user(wdt_time, p);

case WDIOC_GETTIMEOUT:
return put_user(wdt_time, p);

case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);

case WDIOC_SETOPTIONS:
if (get_user(new_value, p))
return -EFAULT;

if (new_value & WDIOS_DISABLECARD)
ks8695_wdt_stop();
if (new_value & WDIOS_ENABLECARD)
ks8695_wdt_start();
return 0;

default:
return -ENOTTY;
return 0;
default:
return -ENOTTY;
}
}

/*
* Pat the watchdog whenever device is written to.
*/
static ssize_t ks8695_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
static ssize_t ks8695_wdt_write(struct file *file, const char *data,
size_t len, loff_t *ppos)
{
ks8695_wdt_reload(); /* pat the watchdog */
return len;
Expand All @@ -207,7 +209,7 @@ static ssize_t ks8695_wdt_write(struct file *file, const char *data, size_t len,
static const struct file_operations ks8695wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.ioctl = ks8695_wdt_ioctl,
.unlocked_ioctl = ks8695_wdt_ioctl,
.open = ks8695_wdt_open,
.release = ks8695_wdt_close,
.write = ks8695_wdt_write,
Expand All @@ -231,7 +233,8 @@ static int __init ks8695wdt_probe(struct platform_device *pdev)
if (res)
return res;

printk("KS8695 Watchdog Timer enabled (%d seconds%s)\n", wdt_time, nowayout ? ", nowayout" : "");
printk(KERN_INFO "KS8695 Watchdog Timer enabled (%d seconds%s)\n",
wdt_time, nowayout ? ", nowayout" : "");
return 0;
}

Expand Down Expand Up @@ -285,12 +288,14 @@ static struct platform_driver ks8695wdt_driver = {

static int __init ks8695_wdt_init(void)
{
/* Check that the heartbeat value is within range; if not reset to the default */
spin_lock_init(&ks8695_lock);
/* Check that the heartbeat value is within range;
if not reset to the default */
if (ks8695_wdt_settimeout(wdt_time)) {
ks8695_wdt_settimeout(WDT_DEFAULT_TIME);
pr_info("ks8695_wdt: wdt_time value must be 1 <= wdt_time <= %i, using %d\n", wdt_time, WDT_MAX_TIME);
pr_info("ks8695_wdt: wdt_time value must be 1 <= wdt_time <= %i, using %d\n",
wdt_time, WDT_MAX_TIME);
}

return platform_driver_register(&ks8695wdt_driver);
}

Expand Down

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