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hw/ptimer: Add "no counter round down" policy 

For most of the timers counter starts to decrement after first period
expires. Due to rounding down performed by the ptimer_get_count, it returns
counter - 1 for the running timer, so that for the ptimer user it looks
like counter gets decremented immediately after running the timer. Add "no
counter round down" policy that provides correct behaviour for those timers.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Message-id: ef39622d0ebfdc32a0877e59ffdf6910dc3db688.1475421224.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 16:26:52 +01:00 committed by Peter Maydell
parent 56700e1aa6
commit 5580ea4576
2 changed files with 13 additions and 0 deletions
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9
hw/core/ptimer.c
View File

@ -231,6 +231,15 @@ uint64_t ptimer_get_count(ptimer_state *s)
}
}
}
if (s->policy_mask & PTIMER_POLICY_NO_COUNTER_ROUND_DOWN) {
/* If now == last then delta == limit, i.e. the counter already
represents the correct value. It would be rounded down a 1ns
later. */
if (now != last) {
counter += 1;
}
}
} else {
counter = s->delta;
}

4
include/hw/ptimer.h
View File

@ -51,6 +51,10 @@
* immediately, but after a one period. */
#define PTIMER_POLICY_NO_IMMEDIATE_RELOAD (1 << 3)
/* Make counter value of the running timer represent the actual value and
* not the one less. */
#define PTIMER_POLICY_NO_COUNTER_ROUND_DOWN (1 << 4)
/* ptimer.c */
typedef struct ptimer_state ptimer_state;
typedef void (*ptimer_cb)(void *opaque);