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hw/ptimer: Add "wraparound after one period" policy

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Currently, periodic counter wraps around immediately once counter reaches
"0", this is wrong behaviour for some of the timers, resulting in one period
being lost. Add new ptimer policy that provides correct behaviour for such
timers, so that counter stays with "0" for a one period before wrapping
around.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Message-id: f22a670cf1f4be298b31640cb5f4be1df0f20ab6.1475421224.git.digetx@gmail.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Dmitry Osipenko 2016-10-24 16:26:50 +01:00 • committed by Peter Maydell
parent a2519ad182
commit 2b5c0322b7
2 changed files with 47 additions and 15 deletions
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4
include/hw/ptimer.h
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@ -35,6 +35,10 @@
*/
#define PTIMER_POLICY_DEFAULT 0
/* Periodic timer counter stays with "0" for a one period before wrapping
* around. */
#define PTIMER_POLICY_WRAP_AFTER_ONE_PERIOD (1 << 0)
/* ptimer.c */
typedef struct ptimer_state ptimer_state;
typedef void (*ptimer_cb)(void *opaque);