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| author | Dmitry Osipenko <digetx@gmail.com> | 2015-07-06 01:47:47 +0300 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2015-07-06 10:25:37 +0100 |
| commit | 8a52340cbaf60d4dd0a78bbfe12632639fe3da6d (patch) | |
| tree | 73f82b1c8f19b101e5ee6d9606f1a0b576965b72 /hw/timer | |
| parent | 12dc273e98e4e111880b25c12bf671dc8951b8e6 (diff) | |
| download | qemu-8a52340cbaf60d4dd0a78bbfe12632639fe3da6d.tar.gz qemu-8a52340cbaf60d4dd0a78bbfe12632639fe3da6d.tar.bz2 qemu-8a52340cbaf60d4dd0a78bbfe12632639fe3da6d.zip | |
arm_mptimer: Fix timer shutdown and mode change
The running timer can't be stopped because timer control code just
doesn't handle disabling the timer. Fix it by deleting the timer if
the enable bit is cleared.
The timer won't start periodic ticking if a ONE-SHOT -> PERIODIC mode
change happens after a one-shot tick was completed. Fix it by
re-starting ticking if the timer isn't ticking right now.
To avoid code churning, these two fixes are squashed in one commit.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/timer')
| -rw-r--r-- | hw/timer/arm_mptimer.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/hw/timer/arm_mptimer.c b/hw/timer/arm_mptimer.c index 8b93b3c1ae..0e132b15b5 100644 --- a/hw/timer/arm_mptimer.c +++ b/hw/timer/arm_mptimer.c @@ -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. */ |