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allwinner-a10-pit: implement prescaler and source selection

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This implements the prescaler and source fields of the timer control
register. The source for each timer can be selected among 4 clock
inputs whose frequencies are set through model properties.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 1395771730-16882-6-git-send-email-b.galvani@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Beniamino Galvani 2014-03-25 19:22:08 +01:00 • committed by Peter Maydell
parent a63f9f85e3
commit 286226a479
3 changed files with 41 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

28
hw/timer/allwinner-a10-pit.c
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@ -74,6 +74,22 @@ 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, source_freq;
prescaler = 1 << extract32(s->control[index], 4, 3);
source = extract32(s->control[index], 2, 2);
source_freq = s->clk_freq[source];
if (source_freq) {
ptimer_set_freq(s->timer[index], source_freq / prescaler);
} else {
qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid clock source %u\n",
__func__, source);
}
}
static void a10_pit_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
@ -96,6 +112,7 @@ 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]);
}
@ -161,6 +178,14 @@ static const MemoryRegionOps a10_pit_ops = {
.endianness = DEVICE_NATIVE_ENDIAN,
};
static Property a10_pit_properties[] = {
DEFINE_PROP_UINT32("clk0-freq", AwA10PITState, clk_freq[0], 0),
DEFINE_PROP_UINT32("clk1-freq", AwA10PITState, clk_freq[1], 0),
DEFINE_PROP_UINT32("clk2-freq", AwA10PITState, clk_freq[2], 0),
DEFINE_PROP_UINT32("clk3-freq", AwA10PITState, clk_freq[3], 0),
DEFINE_PROP_END_OF_LIST(),
};
static const VMStateDescription vmstate_a10_pit = {
.name = "a10.pit",
.version_id = 1,
@ -196,6 +221,7 @@ static void a10_pit_reset(DeviceState *dev)
s->interval[i] = 0;
s->count[i] = 0;
ptimer_stop(s->timer[i]);
a10_pit_set_freq(s, i);
}
s->watch_dog_mode = 0;
s->watch_dog_control = 0;
@ -241,7 +267,6 @@ 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);
}
}
@ -250,6 +275,7 @@ static void a10_pit_class_init(ObjectClass *klass, void *data)
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = a10_pit_reset;
dc->props = a10_pit_properties;
dc->desc = "allwinner a10 timer";
dc->vmsd = &vmstate_a10_pit;
}