powerpc/watchdog: Don't enable interrupt on PPC64 BookE

Critical interrupts are not handled on PPC64 BookE machines,
so when the first watchdog interrupt fires the machine will
freeze without a warning until it's rebooted by the second
watchdog trigger.
Plus, the interrupt isn't used anyway since the driver
expects a usermode app to ping the watchdog periodically.

Signed-off-by: Laurentiu Tudor <Laurentiu.Tudor@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/watchdog/booke_wdt.c b/drivers/watchdog/booke_wdt.c
index a8dbceb32914..f1b8d555080e 100644
--- a/drivers/watchdog/booke_wdt.c
+++ b/drivers/watchdog/booke_wdt.c
@@ -138,6 +138,14 @@ static void __booke_wdt_enable(void *data)
         val &= ~WDTP_MASK;
         val |= (TCR_WIE|TCR_WRC(WRC_CHIP)|WDTP(booke_wdt_period));
 
+#ifdef CONFIG_PPC_BOOK3E_64
+        /*
+         * Crit ints are currently broken on PPC64 Book-E, so
+         * just disable them for now.
+         */
+        val &= ~TCR_WIE;
+#endif
+
         mtspr(SPRN_TCR, val);
 }