static CMD_HANDLER( wd33c93_select_cmd )
{
UINT8 unit = wd33c93_getunit();
UINT8 newstatus;
/* see if we can select that device */
if ( devices[unit] )
{
/* device is available - signal selection done */
newstatus = CSR_SELECT;
/* determine the next bus phase depending on the command */
if ( (scsi_data.regs[WD_COMMAND] & 0x7f) == WD_CMD_SEL_ATN )
{
/* /ATN asserted during select: Move to Message Out Phase to read identify */
scsi_data.busphase = PHS_MESS_OUT;
}
else
{
/* No /ATN asserted: Move to Command Phase */
scsi_data.busphase = PHS_COMMAND;
}
/* queue up a service request out in the future */
machine.scheduler().timer_set( attotime::from_usec(50), FUNC(wd33c93_service_request ));
}
else
{
/* device is not available */
newstatus = CSR_TIMEOUT;
}
/* complete the command */
wd33c93_complete_cmd(newstatus);
}
/* command handlers */
static CMD_HANDLER( wd33c93_invalid_cmd )
{
logerror( "%s:Unknown/Unimplemented SCSI controller command: %02x\n", machine.describe_context(), scsi_data.regs[WD_COMMAND] );
/* complete the command */
wd33c93_complete_cmd( CSR_INVALID );
}
/* command handlers */
static void wd33c93_invalid_cmd( void )
{
logerror( "Unknown/Unimplemented SCSI controller command: %02x (PC=%x)\n", scsi_data.regs[WD_COMMAND], activecpu_get_pc() );
/* complete the command */
wd33c93_complete_cmd( CSR_INVALID );
}
static CMD_HANDLER( wd33c93_reset_cmd )
{
int advanced = 0;
/* see if it wants us to reset with advanced features */
if ( scsi_data.regs[WD_OWN_ID] & OWNID_EAF )
{
advanced = 1;
}
/* clear out all registers */
memset( scsi_data.regs, 0, sizeof( scsi_data.regs ) );
/* complete the command */
wd33c93_complete_cmd(advanced ? CSR_RESET_AF : CSR_RESET);
}
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);
}
static CMD_HANDLER( wd33c93_abort_cmd )
{
/* complete the command */
wd33c93_complete_cmd(CSR_ABORT);
}
static void wd33c93_abort_cmd( void )
{
/* complete the command */
wd33c93_complete_cmd(CSR_ABORT);
}