在 2014-03-15六的 14:01 +0100，Beniamino Galvani写道：
> This implements the prescaler and source fields of the timer control
> register as described in the A10 user manual.
>
> Signed-off-by: Beniamino Galvani <b.galv...@gmail.com>
Reviewed-by: Li Guang <lig.f...@cn.fujitsu.com>
> ---
> hw/timer/allwinner-a10-pit.c | 30 +++++++++++++++++++++++++++++-
> include/hw/timer/allwinner-a10-pit.h | 8 ++++++++
> 2 files changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/hw/timer/allwinner-a10-pit.c b/hw/timer/allwinner-a10-pit.c
> index f8c9236..a448689 100644
> --- a/hw/timer/allwinner-a10-pit.c
> +++ b/hw/timer/allwinner-a10-pit.c
> @@ -74,6 +74,34 @@ static uint64_t a10_pit_read(void *opaque, hwaddr offset,
> unsigned size)
> return 0;
> }
>
> +static void a10_pit_set_freq(AwA10PITState *s, int index)
> +{
> + uint32_t prescaler, source;
> + uint32_t source_freq = AW_A10_PIT_OSC24M_FREQ;
> +
> + prescaler = 1 << extract32(s->control[index], 4, 3);
> + source = extract32(s->control[index], 2, 2);
> +
> + switch (source) {
> + case AW_A10_PIT_SOURCE_LS_OSC:
> + source_freq = AW_A10_PIT_LS_OSC_FREQ;
> + break;
> + case AW_A10_PIT_SOURCE_OSC24M:
> + source_freq = AW_A10_PIT_OSC24M_FREQ;
> + break;
> + case AW_A10_PIT_SOURCE_PLL6:
> + qemu_log_mask(LOG_UNIMP, "%s: unimplemented clock source %u",
> __func__,
> + source);
> + break;
> + case AW_A10_PIT_SOURCE_UNDEF:
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid clock source %u",
> __func__,
> + source);
> + break;
> + }
> +
> + ptimer_set_freq(s->timer[index], source_freq / prescaler);
> +}
> +
> static void a10_pit_write(void *opaque, hwaddr offset, uint64_t value,
> unsigned size)
> {
> @@ -96,6 +124,7 @@ static void a10_pit_write(void *opaque, hwaddr offset,
> uint64_t value,
> switch (offset & 0x0f) {
> case AW_A10_PIT_TIMER_CONTROL:
> s->control[index] = value;
> + a10_pit_set_freq(s, index);
> if (s->control[index] & AW_A10_PIT_TIMER_RELOAD) {
> ptimer_set_count(s->timer[index], s->interval[index]);
> }
> @@ -239,7 +268,6 @@ static void a10_pit_init(Object *obj)
> tc->index = i;
> bh[i] = qemu_bh_new(a10_pit_timer_cb, tc);
> s->timer[i] = ptimer_init(bh[i]);
> - ptimer_set_freq(s->timer[i], 240000);
> }
> }
>
> diff --git a/include/hw/timer/allwinner-a10-pit.h
> b/include/hw/timer/allwinner-a10-pit.h
> index a48d3c7..37a2662 100644
> --- a/include/hw/timer/allwinner-a10-pit.h
> +++ b/include/hw/timer/allwinner-a10-pit.h
> @@ -33,6 +33,14 @@
> #define AW_A10_PIT_TIMER_BASE_END \
> (AW_A10_PIT_TIMER_BASE * 6 + AW_A10_PIT_TIMER_COUNT)
>
> +#define AW_A10_PIT_SOURCE_LS_OSC 0
> +#define AW_A10_PIT_SOURCE_OSC24M 1
> +#define AW_A10_PIT_SOURCE_PLL6 2
> +#define AW_A10_PIT_SOURCE_UNDEF 3
> +
> +#define AW_A10_PIT_LS_OSC_FREQ 32768
> +#define AW_A10_PIT_OSC24M_FREQ 24000000
> +
> #define AW_A10_PIT_DEFAULT_CLOCK 0x4
>
> typedef struct AwA10PITState AwA10PITState;
