Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20150706' into staging

target-arm queue:
 * TLBI ALLEI1IS should operate on all CPUs, not just this one
 * Fix interval interrupt of cadence ttc in decrement mode
 * Implement YIELD insn to yield in ARM and Thumb translators
 * ARM GIC: reset all registers
 * arm_mptimer: fix timer shutdown and mode change
 * arm_mptimer: respect IT bit state

# gpg: Signature made Mon Jul  6 10:58:27 2015 BST using RSA key ID 14360CDE
# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>"

* remotes/pmaydell/tags/pull-target-arm-20150706:
  arm_mptimer: Respect IT bit state
  arm_mptimer: Fix timer shutdown and mode change
  hw/intc/arm_gic_common.c: Reset all registers
  target-arm: Implement YIELD insn to yield in ARM and Thumb translators
  target-arm: Split DISAS_YIELD from DISAS_WFE
  Fix interval interrupt of cadence ttc when timer is in decrement mode
  target-arm: fix write helper for TLBI ALLE1IS

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 10 insertions, 3 deletions

diff --git a/hw/timer/arm_mptimer.c b/hw/timer/arm_mptimer.c
index 8b93b3c1ae..3e59c2a288 100644
--- a/hw/timer/arm_mptimer.c
+++ b/hw/timer/arm_mptimer.c
@@ -38,7 +38,7 @@ static inline int get_current_cpu(ARMMPTimerState *s)
 
 static inline void timerblock_update_irq(TimerBlock *tb)
 {
-    qemu_set_irq(tb->irq, tb->status);
+    qemu_set_irq(tb->irq, tb->status && (tb->control & 4));
 }
 
 /* Return conversion factor from mpcore timer ticks to qemu timer ticks.  */
@@ -122,11 +122,18 @@ static void timerblock_write(void *opaque, hwaddr addr,
     case 8: /* Control.  */
         old = tb->control;
         tb->control = value;
-        if (((old & 1) == 0) && (value & 1)) {
-            if (tb->count == 0 && (tb->control & 2)) {
+        if (value & 1) {
+            if ((old & 1) && (tb->count != 0)) {
+                /* Do nothing if timer is ticking right now.  */
+                break;
+            }
+            if (tb->control & 2) {
                 tb->count = tb->load;
             }
             timerblock_reload(tb, 1);
+        } else if (old & 1) {
+            /* Shutdown the timer.  */
+            timer_del(tb->timer);
         }
         break;
     case 12: /* Interrupt status.  */