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/*
scsicb.c
Implementation of a raw SCSI/SASI bus for machines that don't use a SCSI
controler chip such as the RM Nimbus, which implements it as a bunch of
74LS series chips.
*/
#include "scsicb.h"
#include "scsibus.h"
#define VERBOSE_LEVEL ( 0 )
INLINE void ATTR_PRINTF( 3, 4 ) verboselog( int n_level, running_machine &machine, const char *s_fmt, ... )
{
if( VERBOSE_LEVEL >= n_level )
{
va_list v;
char buf[ 32768 ];
va_start( v, s_fmt );
vsprintf( buf, s_fmt, v );
va_end( v );
logerror( "%s: %s", machine.describe_context( ), buf );
}
}
scsicb_device::scsicb_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: scsidev_device(mconfig, SCSICB, "SCSI callback", tag, owner, clock, "scsicb", __FILE__),
m_bsy_handler(*this),
m_sel_handler(*this),
m_cd_handler(*this),
m_io_handler(*this),
m_msg_handler(*this),
m_req_handler(*this),
m_ack_handler(*this),
m_atn_handler(*this),
m_rst_handler(*this)
{
}
void scsicb_device::device_start()
{
scsidev_device::device_start();
linestate = 0;
m_bsy_handler.resolve_safe();
m_sel_handler.resolve_safe();
m_cd_handler.resolve_safe();
m_io_handler.resolve_safe();
m_msg_handler.resolve_safe();
m_req_handler.resolve_safe();
m_ack_handler.resolve_safe();
m_atn_handler.resolve_safe();
m_rst_handler.resolve_safe();
}
void scsicb_device::scsi_in( UINT32 data, UINT32 mask )
{
linestate = data;
trigger_callback( mask, SCSI_MASK_BSY, m_bsy_handler );
trigger_callback( mask, SCSI_MASK_SEL, m_sel_handler );
trigger_callback( mask, SCSI_MASK_CD, m_cd_handler );
trigger_callback( mask, SCSI_MASK_IO, m_io_handler );
trigger_callback( mask, SCSI_MASK_MSG, m_msg_handler );
trigger_callback( mask, SCSI_MASK_REQ, m_req_handler );
trigger_callback( mask, SCSI_MASK_ACK, m_ack_handler );
trigger_callback( mask, SCSI_MASK_ATN, m_atn_handler );
trigger_callback( mask, SCSI_MASK_RST, m_rst_handler );
}
UINT8 scsicb_device::scsi_data_r()
{
UINT8 data = linestate & SCSI_MASK_DATA;
verboselog( 1, machine(), "%s scsi_data_r() %02x\n", tag(), data );
return data;
}
void scsicb_device::scsi_data_w( UINT8 data )
{
verboselog( 1, machine(), "%s scsi_data_w( %02x )\n", tag(), data );
scsi_out( data, SCSI_MASK_DATA );
}
READ8_MEMBER( scsicb_device::scsi_data_r )
{
return scsi_data_r();
}
WRITE8_MEMBER( scsicb_device::scsi_data_w )
{
scsi_data_w( data );
}
READ_LINE_MEMBER( scsicb_device::scsi_bsy_r ) { return get_scsi_line(SCSI_MASK_BSY); }
READ_LINE_MEMBER( scsicb_device::scsi_sel_r ) { return get_scsi_line(SCSI_MASK_SEL); }
READ_LINE_MEMBER( scsicb_device::scsi_cd_r ) { return get_scsi_line(SCSI_MASK_CD); }
READ_LINE_MEMBER( scsicb_device::scsi_io_r ) { return get_scsi_line(SCSI_MASK_IO); }
READ_LINE_MEMBER( scsicb_device::scsi_msg_r ) { return get_scsi_line(SCSI_MASK_MSG); }
READ_LINE_MEMBER( scsicb_device::scsi_req_r ) { return get_scsi_line(SCSI_MASK_REQ); }
READ_LINE_MEMBER( scsicb_device::scsi_ack_r ) { return get_scsi_line(SCSI_MASK_ACK); }
READ_LINE_MEMBER( scsicb_device::scsi_atn_r ) { return get_scsi_line(SCSI_MASK_ATN); }
READ_LINE_MEMBER( scsicb_device::scsi_rst_r ) { return get_scsi_line(SCSI_MASK_RST); }
WRITE_LINE_MEMBER( scsicb_device::scsi_bsy_w ) { set_scsi_line(SCSI_MASK_BSY, state); }
WRITE_LINE_MEMBER( scsicb_device::scsi_sel_w ) { set_scsi_line(SCSI_MASK_SEL, state); }
WRITE_LINE_MEMBER( scsicb_device::scsi_cd_w ) { set_scsi_line(SCSI_MASK_CD, state); }
WRITE_LINE_MEMBER( scsicb_device::scsi_io_w ) { set_scsi_line(SCSI_MASK_IO, state); }
WRITE_LINE_MEMBER( scsicb_device::scsi_msg_w ) { set_scsi_line(SCSI_MASK_MSG, state); }
WRITE_LINE_MEMBER( scsicb_device::scsi_req_w ) { set_scsi_line(SCSI_MASK_REQ, state); }
WRITE_LINE_MEMBER( scsicb_device::scsi_ack_w ) { set_scsi_line(SCSI_MASK_ACK, state); }
WRITE_LINE_MEMBER( scsicb_device::scsi_atn_w ) { set_scsi_line(SCSI_MASK_ATN, state); }
WRITE_LINE_MEMBER( scsicb_device::scsi_rst_w ) { set_scsi_line(SCSI_MASK_RST, state); }
UINT8 scsicb_device::get_scsi_line( UINT32 mask )
{
UINT8 state;
if( ( linestate & mask ) != 0 )
{
state = 1;
}
else
{
state = 0;
}
verboselog( 1, machine(), "%s get_scsi_line %s %d\n", tag(), get_line_name( mask ), state );
return state;
}
void scsicb_device::set_scsi_line( UINT32 mask, UINT8 state )
{
verboselog( 1, machine(), "%s set_scsi_line %s %d\n", tag(), get_line_name( mask ), state );
if( state )
{
scsi_out( mask, mask );
}
else
{
scsi_out( 0, mask );
}
}
void scsicb_device::trigger_callback( UINT32 update_mask, UINT32 line_mask, devcb2_write_line &write_line )
{
if( ( update_mask & line_mask ) != 0 && !write_line.isnull() )
{
UINT8 state;
if( ( linestate & line_mask ) != 0 )
{
state = 1;
}
else
{
state = 0;
}
verboselog( 1, machine(), "%s trigger_callback %s %d\n", tag(), get_line_name( line_mask ), state );
write_line( state );
}
}
const char *scsicb_device::get_line_name( UINT32 mask )
{
switch( mask )
{
case SCSI_MASK_BSY:
return "bsy";
case SCSI_MASK_SEL:
return "sel";
case SCSI_MASK_CD:
return "cd";
case SCSI_MASK_IO:
return "io";
case SCSI_MASK_MSG:
return "msg";
case SCSI_MASK_REQ:
return "req";
case SCSI_MASK_ACK:
return "ack";
case SCSI_MASK_ATN:
return "atn";
case SCSI_MASK_RST:
return "rst";
}
return "?";
}
const device_type SCSICB = &device_creator<scsicb_device>;
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