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hw/ptimer: Support "on the fly" timer mode switch

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Allow switching between periodic <-> oneshot modes while timer is running.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Message-id: f030be6e28fbd219e1e8d22297aee367bd9af5bb.1464367869.git.digetx@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Dmitry Osipenko 2016-06-06 16:59:31 +01:00 committed by Peter Maydell
parent 7ef6e3cf8d
commit 869e92b5c3
1 changed files with 7 additions and 6 deletions
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9
hw/core/ptimer.c
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@ -163,16 +163,17 @@ void ptimer_set_count(ptimer_state *s, uint64_t count)
void ptimer_run(ptimer_state *s, int oneshot)
{
if (s->enabled) {
return;
}
if (s->period == 0) {
bool was_disabled = !s->enabled;
if (was_disabled && s->period == 0) {
fprintf(stderr, "Timer with period zero, disabling\n");
return;
}
s->enabled = oneshot ? 2 : 1;
if (was_disabled) {
s->next_event = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
ptimer_reload(s);
}
}
/* Pause a timer. Note that this may cause it to "lose" time, even if it