static void arm_timer_write(void *opaque, hwaddr offset,
uint32_t value)
{
arm_timer_state *s = (arm_timer_state *)opaque;
int freq;
switch (offset >> 2) {
case 0: /* TimerLoad */
s->limit = value;
arm_timer_recalibrate(s, 1);
break;
case 1: /* TimerValue */
/* ??? Linux seems to want to write to this readonly register.
Ignore it. */
break;
case 2: /* TimerControl */
if (s->control & TIMER_CTRL_ENABLE) {
/* Pause the timer if it is running. This may cause some
inaccuracy dure to rounding, but avoids a whole lot of other
messyness. */
ptimer_stop(s->timer);
}
s->control = value;
freq = s->freq;
/* ??? Need to recalculate expiry time after changing divisor. */
switch ((value >> 2) & 3) {
case 1: freq >>= 4; break;
case 2: freq >>= 8; break;
}
arm_timer_recalibrate(s, s->control & TIMER_CTRL_ENABLE);
ptimer_set_freq(s->timer, freq);
if (s->control & TIMER_CTRL_ENABLE) {
/* Restart the timer if still enabled. */
ptimer_run(s->timer, (s->control & TIMER_CTRL_ONESHOT) != 0);
}
break;
case 3: /* TimerIntClr */
s->int_level = 0;
break;
case 6: /* TimerBGLoad */
s->limit = value;
arm_timer_recalibrate(s, 0);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Bad offset %x\n", __func__, (int)offset);
}
arm_timer_update(s);
}
static void arm_timer_tick(void *opaque)
{
arm_timer_state *s = (arm_timer_state *)opaque;
s->int_level = 1;
arm_timer_update(s);
}