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i186: fix dma on timer2 and timer2 as prescaler (#12223)

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* i186: fix drq_callback case when used with timer 2

* i186: only run timer 0,1 when not incremented via timer 2 pre-scaler
This commit is contained in:
Hannes Janetzek 2024-04-07 01:12:32 +02:00 committed by GitHub
parent c6c79c7252
commit b49381262b
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GPG Key ID: B5690EEEBB952194
1 changed files with 6 additions and 2 deletions
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8
src/devices/cpu/i86/i186.cpp
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@ -1258,9 +1258,9 @@ TIMER_CALLBACK_MEMBER(i80186_cpu_device::timer_elapsed)
if (which == 2)
{
if ((m_dma[0].control & (TIMER_DRQ | ST_STOP)) == TIMER_DRQ)
if ((m_dma[0].control & (TIMER_DRQ | ST_STOP)) == (TIMER_DRQ | ST_STOP))
drq_callback(0);
if ((m_dma[1].control & (TIMER_DRQ | ST_STOP)) == TIMER_DRQ)
if ((m_dma[1].control & (TIMER_DRQ | ST_STOP)) == (TIMER_DRQ | ST_STOP))
drq_callback(1);
if ((m_timer[0].control & 0x800c) == 0x8008)
inc_timer(0);
@ -1308,6 +1308,10 @@ TIMER_CALLBACK_MEMBER(i80186_cpu_device::timer_elapsed)
void i80186_cpu_device::restart_timer(int which)
{
timer_state *t = &m_timer[which];
/* Only run timer 0,1 when not incremented via timer 2 pre-scaler */
if (which != 2 && (t->control & 0x800c) == 0x8008)
return;
int count = (t->control & 0x1000) ? t->maxB : t->maxA;
if (!(t->control & 4))
t->int_timer->adjust((attotime::from_hz(clock() / 8) * (count ? count : 0x10000)), which);