void wd33c93_get_dma_data( int bytes, UINT8 *pData )
{
int len = bytes;
if ( len >= wd33c93_get_xfer_count() )
len = wd33c93_get_xfer_count();
if ( len == 0 )
return;
if ( (scsi_data.temp_input_pos+len) >= TEMP_INPUT_LEN )
{
logerror( "Reading past end of buffer, increase TEMP_INPUT_LEN size\n" );
len = TEMP_INPUT_LEN - len;
}
memcpy( pData, &scsi_data.temp_input[scsi_data.temp_input_pos], len );
scsi_data.temp_input_pos += len;
len = wd33c93_get_xfer_count() - len;
wd33c93_set_xfer_count(len);
}
void wd33c93_clear_dma(void)
{
/* indicate DMA completed by clearing the transfer count */
wd33c93_set_xfer_count(0);
scsi_data.regs[WD_AUXILIARY_STATUS] &= ~ASR_DBR;
}
static CMD_HANDLER( wd33c93_selectxfer_cmd )
{
UINT8 unit = wd33c93_getunit();
UINT8 newstatus;
/* see if we can select that device */
if ( devices[unit] )
{
if ( scsi_data.regs[WD_COMMAND_PHASE] < 0x45 )
{
/* device is available */
int xfercount;
int phase;
/* do the request */
devices[unit]->SetCommand( &scsi_data.regs[WD_CDB_1], 12 );
devices[unit]->ExecCommand( &xfercount );
devices[unit]->GetPhase( &phase );
/* set transfer count */
if ( wd33c93_get_xfer_count() > TEMP_INPUT_LEN )
{
logerror( "WD33C93: Transfer count too big. Please increase TEMP_INPUT_LEN (size=%d)\n", wd33c93_get_xfer_count() );
wd33c93_set_xfer_count( TEMP_INPUT_LEN );
}
switch( phase )
{
case SCSI_PHASE_DATAIN:
scsi_data.read_pending = 1;
break;
}
}
if ( scsi_data.read_pending )
{
int len = TEMP_INPUT_LEN;
if ( wd33c93_get_xfer_count() < len ) len = wd33c93_get_xfer_count();
memset( &scsi_data.temp_input[0], 0, TEMP_INPUT_LEN );
wd33c93_read_data( len, &scsi_data.temp_input[0] );
scsi_data.temp_input_pos = 0;
scsi_data.read_pending = 0;
}
scsi_data.regs[WD_TARGET_LUN] = 0;
scsi_data.regs[WD_CONTROL] |= CTRL_EDI;
scsi_data.regs[WD_COMMAND_PHASE] = 0x60;
/* signal transfer ready */
newstatus = CSR_SEL_XFER_DONE;
/* if allowed disconnect, queue a service request */
if ( scsi_data.identify & 0x40 )
{
/* queue disconnect message in */
scsi_data.busphase = PHS_MESS_IN;
/* queue up a service request out in the future */
machine.scheduler().timer_set( attotime::from_msec(50), FUNC(wd33c93_service_request ));
}
}
else
{
/* device is not available */
newstatus = CSR_TIMEOUT;
wd33c93_set_xfer_count( 0 );
}
/* complete the command */
wd33c93_complete_cmd(newstatus);
}
