return 0;
}
+static void __booke_wdt_set(void *data)
+{
+ u32 val;
+
+ val = mfspr(SPRN_TCR);
+ val &= ~WDTP_MASK;
+ val |= WDTP(booke_wdt_period);
+
+ mtspr(SPRN_TCR, val);
+}
+
+static void booke_wdt_set(void)
+{
+ on_each_cpu(__booke_wdt_set, NULL, 0);
+}
+
static void __booke_wdt_ping(void *data)
{
mtspr(SPRN_TSR, TSR_ENW|TSR_WIS);
#else
booke_wdt_period = tmp;
#endif
- mtspr(SPRN_TCR, (mfspr(SPRN_TCR) & ~WDTP_MASK) |
- WDTP(booke_wdt_period));
+ booke_wdt_set();
return 0;
case WDIOC_GETTIMEOUT:
return put_user(booke_wdt_period, p);
return 0;
}
+/* wdt_is_active stores wether or not the /dev/watchdog device is opened */
+static unsigned long wdt_is_active;
+
static int booke_wdt_open(struct inode *inode, struct file *file)
{
+ /* /dev/watchdog can only be opened once */
+ if (test_and_set_bit(0, &wdt_is_active))
+ return -EBUSY;
+
spin_lock(&booke_wdt_lock);
if (booke_wdt_enabled == 0) {
booke_wdt_enabled = 1;
static int booke_wdt_release(struct inode *inode, struct file *file)
{
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ /* Normally, the watchdog is disabled when /dev/watchdog is closed, but
+ * if CONFIG_WATCHDOG_NOWAYOUT is defined, then it means that the
+ * watchdog should remain enabled. So we disable it only if
+ * CONFIG_WATCHDOG_NOWAYOUT is not defined.
+ */
on_each_cpu(__booke_wdt_disable, NULL, 0);
booke_wdt_enabled = 0;
+#endif
+
+ clear_bit(0, &wdt_is_active);
return 0;
}