static uint64_t slavio_timer_mem_readl(void *opaque, hwaddr addr,
unsigned size)
{
TimerContext *tc = opaque;
SLAVIO_TIMERState *s = tc->s;
uint32_t saddr, ret;
unsigned int timer_index = tc->timer_index;
CPUTimerState *t = &s->cputimer[timer_index];
saddr = addr >> 2;
switch (saddr) {
case TIMER_LIMIT:
// read limit (system counter mode) or read most signifying
// part of counter (user mode)
if (slavio_timer_is_user(tc)) {
// read user timer MSW
slavio_timer_get_out(t);
ret = t->counthigh | t->reached;
} else {
// read limit
// clear irq
qemu_irq_lower(t->irq);
t->reached = 0;
ret = t->limit & TIMER_LIMIT_MASK32;
}
break;
case TIMER_COUNTER:
// read counter and reached bit (system mode) or read lsbits
// of counter (user mode)
slavio_timer_get_out(t);
if (slavio_timer_is_user(tc)) { // read user timer LSW
ret = t->count & TIMER_MAX_COUNT64;
} else { // read limit
ret = (t->count & TIMER_MAX_COUNT32) |
t->reached;
}
break;
case TIMER_STATUS:
// only available in processor counter/timer
// read start/stop status
if (timer_index > 0) {
ret = t->run;
} else {
ret = 0;
}
break;
case TIMER_MODE:
// only available in system counter
// read user/system mode
ret = s->cputimer_mode;
break;
default:
trace_slavio_timer_mem_readl_invalid(addr);
ret = 0;
break;
}
trace_slavio_timer_mem_readl(addr, ret);
return ret;
}
static uint32_t slavio_timer_mem_readl(void *opaque, target_phys_addr_t addr)
{
SLAVIO_TIMERState *s = opaque;
uint32_t saddr, ret;
saddr = addr >> 2;
switch (saddr) {
case TIMER_LIMIT:
// read limit (system counter mode) or read most signifying
// part of counter (user mode)
if (slavio_timer_is_user(s)) {
// read user timer MSW
slavio_timer_get_out(s);
ret = s->counthigh | s->reached;
} else {
// read limit
// clear irq
qemu_irq_lower(s->irq);
s->reached = 0;
ret = s->limit & TIMER_LIMIT_MASK32;
}
break;
case TIMER_COUNTER:
// read counter and reached bit (system mode) or read lsbits
// of counter (user mode)
slavio_timer_get_out(s);
if (slavio_timer_is_user(s)) // read user timer LSW
ret = s->count & TIMER_MAX_COUNT64;
else // read limit
ret = (s->count & TIMER_MAX_COUNT32) | s->reached;
break;
case TIMER_STATUS:
// only available in processor counter/timer
// read start/stop status
ret = s->running;
break;
case TIMER_MODE:
// only available in system counter
// read user/system mode
ret = s->slave_mode;
break;
default:
DPRINTF("invalid read address " TARGET_FMT_plx "\n", addr);
ret = 0;
break;
}
DPRINTF("read " TARGET_FMT_plx " = %08x\n", addr, ret);
return ret;
}
// timer callback
static void slavio_timer_irq(void *opaque)
{
SLAVIO_TIMERState *s = opaque;
slavio_timer_get_out(s);
DPRINTF("callback: count %x%08x\n", s->counthigh, s->count);
s->reached = TIMER_REACHED;
if (!slavio_timer_is_user(s))
qemu_irq_raise(s->irq);
}
// timer callback
static void slavio_timer_irq(void *opaque)
{
TimerContext *tc = opaque;
SLAVIO_TIMERState *s = tc->s;
CPUTimerState *t = &s->cputimer[tc->timer_index];
slavio_timer_get_out(t);
DPRINTF("callback: count %x%08x\n", t->counthigh, t->count);
t->reached = TIMER_REACHED;
if (!slavio_timer_is_user(tc)) {
qemu_irq_raise(t->irq);
}
}
// timer callback
static void slavio_timer_irq(void *opaque)
{
TimerContext *tc = opaque;
SLAVIO_TIMERState *s = tc->s;
CPUTimerState *t = &s->cputimer[tc->timer_index];
slavio_timer_get_out(t);
trace_slavio_timer_irq(t->counthigh, t->count);
/* if limit is 0 (free-run), there will be no match */
if (t->limit != 0) {
t->reached = TIMER_REACHED;
}
/* there is no interrupt if user timer or free-run */
if (!slavio_timer_is_user(tc) && t->limit != 0) {
qemu_irq_raise(t->irq);
}
}
