static inline void ath79_wdt_enable(void)
{
ath79_wdt_keepalive();
ath79_reset_wr(AR71XX_RESET_REG_WDOG_CTRL, WDOG_CTRL_ACTION_FCR);
/* flush write */
ath79_reset_rr(AR71XX_RESET_REG_WDOG_CTRL);
}
static ssize_t ath79_wdt_write(struct file *file, const char *data,
size_t len, loff_t *ppos)
{
if (len) {
if (!nowayout) {
size_t i;
clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags);
for (i = 0; i != len; i++) {
char c;
if (get_user(c, data + i))
return -EFAULT;
if (c == 'V')
set_bit(WDT_FLAGS_EXPECT_CLOSE,
&wdt_flags);
}
}
ath79_wdt_keepalive();
}
return len;
}
static int ath79_wdt_set_timeout(int val)
{
if (val < 1 || val > max_timeout)
return -EINVAL;
timeout = val;
ath79_wdt_keepalive();
return 0;
}
static inline void ath79_wdt_enable(void)
{
ath79_wdt_keepalive();
/*
* Updating the TIMER register requires a few microseconds
* on the AR934x SoCs at least. Use a small delay to ensure
* that the TIMER register is updated within the hardware
* before enabling the watchdog.
*/
udelay(2);
ath79_reset_wr(AR71XX_RESET_REG_WDOG_CTRL, WDOG_CTRL_ACTION_FCR);
}
static int ath79_wdt_release(struct inode *inode, struct file *file)
{
if (test_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags))
ath79_wdt_disable();
else {
pr_crit("device closed unexpectedly, watchdog timer will not stop!\n");
ath79_wdt_keepalive();
}
clear_bit(WDT_FLAGS_BUSY, &wdt_flags);
clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags);
return 0;
}
static long ath79_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int err;
int t;
switch (cmd) {
case WDIOC_GETSUPPORT:
err = copy_to_user(argp, &ath79_wdt_info,
sizeof(ath79_wdt_info)) ? -EFAULT : 0;
break;
case WDIOC_GETSTATUS:
err = put_user(0, p);
break;
case WDIOC_GETBOOTSTATUS:
err = put_user(boot_status, p);
break;
case WDIOC_KEEPALIVE:
ath79_wdt_keepalive();
err = 0;
break;
case WDIOC_SETTIMEOUT:
err = get_user(t, p);
if (err)
break;
err = ath79_wdt_set_timeout(t);
if (err)
break;
/* fallthrough */
case WDIOC_GETTIMEOUT:
err = put_user(timeout, p);
break;
default:
err = -ENOTTY;
break;
}
return err;
}