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cxd1185: fixes (nw)

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* clear initiator state and scsi control after selection timeout
* start dma during dma out operations
* improve scsi reset timer logic
This commit is contained in:
Patrick Mackinlay 2020-03-31 21:30:48 +07:00
parent c3c45bb12f
commit d1022589dc
1 changed files with 16 additions and 7 deletions
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23
src/devices/machine/cxd1185.cpp
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@ -129,7 +129,7 @@ void cxd1185_device::reset_chip()
m_int_req[0] = 0;
m_int_req[1] = 0;
m_sel_time = 0;
m_rst_time = SCSI_RST_HOLD;
m_rst_time = 0;
m_scsi_id = 0;
m_int_auth[0] = 0;
m_int_auth[1] = 0;
@ -299,12 +299,12 @@ void cxd1185_device::command_w(u8 data)
case 0x40: LOGMASKED(LOG_CMD, "reselect\n"); break;
case 0x41:
LOGMASKED(LOG_CMD, "select without atn\n");
LOGMASKED(LOG_CMD, "select target %d without atn\n", (m_scsi_id & TID) >> 5);
m_status |= INIT;
m_state = ARB_BUS_FREE;
break;
case 0x42:
LOGMASKED(LOG_CMD, "select with atn\n");
LOGMASKED(LOG_CMD, "select target %d with atn\n", (m_scsi_id & TID) >> 5);
m_status |= INIT;
m_state = ARB_BUS_FREE;
break;
@ -531,8 +531,8 @@ int cxd1185_device::state_step()
if ((scsi_bus->ctrl_r() & S_SEL) || (scsi_bus->data_r() & ~((oid - 1) | oid)))
{
LOGMASKED(LOG_STATE, "arbitration: lost\n");
m_int_req[0] |= ARBF;
m_status &= ~INIT;
m_int_req[0] |= ARBF;
m_state = COMPLETE;
@ -578,8 +578,11 @@ int cxd1185_device::state_step()
else
{
LOGMASKED(LOG_STATE, "selection: timed out\n");
m_status &= ~INIT;
m_int_req[0] |= STO;
m_state = COMPLETE;
scsi_bus->ctrl_w(scsi_refid, 0, S_ATN | S_SEL);
}
break;
case SEL_COMPLETE:
@ -670,7 +673,11 @@ int cxd1185_device::state_step()
scsi_bus->ctrl_w(scsi_refid, S_ACK, S_ACK);
}
else
{
delay = -1;
if (m_command & DMA)
set_drq(true);
}
break;
case XFR_OUT_NEXT:
if (!(scsi_bus->ctrl_r() & S_REQ))
@ -706,11 +713,11 @@ int cxd1185_device::state_step()
case BUS_RESET:
LOGMASKED(LOG_STATE, "bus reset: asserted\n");
m_int_req[1] |= SRST;
m_status &= ~(INIT | TARG);
m_int_req[1] |= SRST;
m_state = BUS_RESET_DONE;
delay = m_rst_time;
delay = (m_mode & TMSL) ? m_rst_time : SCSI_RST_HOLD;
// clear data and assert RST
scsi_bus->data_w(scsi_refid, 0);
@ -718,6 +725,8 @@ int cxd1185_device::state_step()
break;
case BUS_RESET_DONE:
LOGMASKED(LOG_STATE, "bus reset: complete\n");
if (m_mode & TMSL)
m_int_req[0] |= STO;
m_state = COMPLETE;
// clear RST
@ -750,8 +759,8 @@ void cxd1185_device::scsi_ctrl_changed()
if (ctrl & S_RST)
{
m_int_req[1] |= SRST;
m_status &= ~(INIT | TARG);
m_int_req[1] |= SRST;
// clear data and ctrl
scsi_bus->data_w(scsi_refid, 0);