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musicpal: Make PIT emulation more robust 

Stop the periodic timers of the PIT on reset, disabling via the control
register and invalid parameters.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2009-09-18 20:51:23 +02:00 committed by Anthony Liguori
parent 267c48404f
commit c88d6bded6
1 changed files with 28 additions and 6 deletions
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34
hw/musicpal.c
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@ -696,7 +696,6 @@ typedef struct mv88w8618_timer_state {
typedef struct mv88w8618_pit_state {
SysBusDevice busdev;
mv88w8618_timer_state timer[4];
uint32_t control;
} mv88w8618_pit_state;
static void mv88w8618_timer_tick(void *opaque)
@ -744,16 +743,22 @@ static void mv88w8618_pit_write(void *opaque, target_phys_addr_t offset,
case MP_PIT_TIMER1_LENGTH ... MP_PIT_TIMER4_LENGTH:
t = &s->timer[offset >> 2];
t->limit = value;
ptimer_set_limit(t->ptimer, t->limit, 1);
if (t->limit > 0) {
ptimer_set_limit(t->ptimer, t->limit, 1);
} else {
ptimer_stop(t->ptimer);
}
break;
case MP_PIT_CONTROL:
for (i = 0; i < 4; i++) {
if (value & 0xf) {
t = &s->timer[i];
t = &s->timer[i];
if (value & 0xf && t->limit > 0) {
ptimer_set_limit(t->ptimer, t->limit, 0);
ptimer_set_freq(t->ptimer, t->freq);
ptimer_run(t->ptimer, 0);
} else {
ptimer_stop(t->ptimer);
}
value >>= 4;
}
@ -767,6 +772,17 @@ static void mv88w8618_pit_write(void *opaque, target_phys_addr_t offset,
}
}
static void mv88w8618_pit_reset(void *opaque)
{
mv88w8618_pit_state *s = opaque;
int i;
for (i = 0; i < 4; i++) {
ptimer_stop(s->timer[i].ptimer);
s->timer[i].limit = 0;
}
}
static CPUReadMemoryFunc * const mv88w8618_pit_readfn[] = {
mv88w8618_pit_read,
mv88w8618_pit_read,
@ -797,6 +813,13 @@ static int mv88w8618_pit_init(SysBusDevice *dev)
return 0;
}
static SysBusDeviceInfo mv88w8618_pit_info = {
.init = mv88w8618_pit_init,
.qdev.name = "mv88w8618_pit",
.qdev.size = sizeof(mv88w8618_pit_state),
.qdev.reset = mv88w8618_pit_reset,
};
/* Flash config register offsets */
#define MP_FLASHCFG_CFGR0 0x04
@ -1448,8 +1471,7 @@ static void musicpal_register_devices(void)
{
sysbus_register_dev("mv88w8618_pic", sizeof(mv88w8618_pic_state),
mv88w8618_pic_init);
sysbus_register_dev("mv88w8618_pit", sizeof(mv88w8618_pit_state),
mv88w8618_pit_init);
sysbus_register_withprop(&mv88w8618_pit_info);
sysbus_register_dev("mv88w8618_flashcfg", sizeof(mv88w8618_flashcfg_state),
mv88w8618_flashcfg_init);
sysbus_register_dev("mv88w8618_eth", sizeof(mv88w8618_eth_state),