// license:BSD-3-Clause
// copyright-holders:smf
/*
* ds1204.c
*
* Electronic Key
*
*/
#include <stdio.h>
#include "emu.h"
#include "ds1204.h"
#define VERBOSE_LEVEL ( 0 )
inline void ATTR_PRINTF( 3, 4 ) ds1204_device::verboselog( int n_level, 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: ds1204(%s) %s", machine().describe_context(), tag().c_str(), buf );
}
}
// device type definition
const device_type DS1204 = &device_creator<ds1204_device>;
ds1204_device::ds1204_device( const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock )
: device_t( mconfig, DS1204, "DS1204", tag, owner, clock, "ds1204", __FILE__ ),
device_nvram_interface(mconfig, *this),
m_rst( 0 ),
m_clk( 0 ),
m_dqw( 0 ), m_dqr(0), m_state(0), m_bit(0)
{
}
void ds1204_device::device_start()
{
new_state( STATE_STOP );
m_dqr = DQ_HIGH_IMPEDANCE;
memset( m_command, 0, sizeof( m_command ) );
memset( m_compare_register, 0, sizeof( m_compare_register ) );
save_item( NAME( m_rst ) );
save_item( NAME( m_clk ) );
save_item( NAME( m_dqw ) );
save_item( NAME( m_dqr ) );
save_item( NAME( m_state ) );
save_item( NAME( m_bit ) );
save_item( NAME( m_command ) );
save_item( NAME( m_compare_register ) );
save_item( NAME( m_unique_pattern ) );
save_item( NAME( m_identification ) );
save_item( NAME( m_security_match ) );
save_item( NAME( m_secure_memory ) );
}
void ds1204_device::nvram_default()
{
memset( m_unique_pattern, 0, sizeof( m_unique_pattern ) );
memset( m_identification, 0, sizeof( m_identification ) );
memset( m_security_match, 0, sizeof( m_security_match ) );
memset( m_secure_memory, 0, sizeof( m_secure_memory ) );
int expected_bytes = sizeof( m_unique_pattern ) + sizeof( m_identification ) + sizeof( m_security_match ) + sizeof( m_secure_memory );
if( !m_region )
{
logerror( "ds1204(%s) region not found\n", tag().c_str() );
}
else if( m_region->bytes() != expected_bytes )
{
logerror( "ds1204(%s) region length 0x%x expected 0x%x\n", tag().c_str(), m_region->bytes(), expected_bytes );
}
else
{
UINT8 *region = m_region->base();
memcpy( m_unique_pattern, region, sizeof( m_unique_pattern ) ); region += sizeof( m_unique_pattern );
memcpy( m_identification, region, sizeof( m_identification ) ); region += sizeof( m_identification );
memcpy( m_security_match, region, sizeof( m_security_match ) ); region += sizeof( m_security_match );
memcpy( m_secure_memory, region, sizeof( m_secure_memory ) ); region += sizeof( m_secure_memory );
}
}
void ds1204_device::nvram_read( emu_file &file )
{
file.read( m_unique_pattern, sizeof( m_unique_pattern ) );
file.read( m_identification, sizeof( m_identification ) );
file.read( m_security_match, sizeof( m_security_match ) );
file.read( m_secure_memory, sizeof( m_secure_memory ) );
}
void ds1204_device::nvram_write( emu_file &file )
{
file.write( m_unique_pattern, sizeof( m_unique_pattern ) );
file.write( m_identification, sizeof( m_identification ) );
file.write( m_security_match, sizeof( m_security_match ) );
file.write( m_secure_memory, sizeof( m_secure_memory ) );
}
void ds1204_device::new_state( int state )
{
m_state = state;
m_bit = 0;
}
void ds1204_device::writebit( UINT8 *buffer )
{
if( m_clk )
{
int index = m_bit / 8;
int mask = 1 << ( m_bit % 8 );
if( m_dqw )
{
buffer[ index ] |= mask;
}
else
{
buffer[ index ] &= ~mask;
}
m_bit++;
}
}
void ds1204_device::readbit( UINT8 *buffer )
{
if( !m_clk )
{
int index = m_bit / 8;
int mask = 1 << ( m_bit % 8 );
if( buffer[ index ] & mask )
{
m_dqr = 1;
}
else
{
m_dqr = 0;
}
}
else
{
m_bit++;
}
}
WRITE_LINE_MEMBER( ds1204_device::write_rst )
{
if( m_rst != state )
{
m_rst = state;
verboselog( 2, "rst=%d\n", m_rst );
if( m_rst )
{
new_state( STATE_PROTOCOL );
}
else
{
switch( m_state )
{
case STATE_WRITE_IDENTIFICATION:
verboselog( 0, "reset during write identification (bit=%d)\n", m_bit );
break;
case STATE_WRITE_SECURITY_MATCH:
verboselog( 0, "reset during write security match (bit=%d)\n", m_bit );
break;
case STATE_WRITE_SECURE_MEMORY:
verboselog( 0, "reset during write secure memory (bit=%d)\n", m_bit );
break;
}
new_state( STATE_STOP );
m_dqr = DQ_HIGH_IMPEDANCE;
}
}
}
WRITE_LINE_MEMBER( ds1204_device::write_clk )
{
if( m_clk != state )
{
m_clk = state;
verboselog( 2, "clk=%d (bit=%d)\n", m_clk, m_bit );
if( m_clk )
{
m_dqr = DQ_HIGH_IMPEDANCE;
}
switch( m_state )
{
case STATE_PROTOCOL:
writebit( m_command );
if( m_bit == 24 )
{
verboselog( 1, "-> command %02x %02x %02x (%02x %02x)\n",
m_command[ 0 ], m_command[ 1 ], m_command[ 2 ], m_unique_pattern[ 0 ], m_unique_pattern[ 1 ] );
if( m_command[ 0 ] == COMMAND_READ && m_command[ 1 ] == ( m_unique_pattern[ 0 ] | CYCLE_NORMAL ) && m_command[ 2 ] == m_unique_pattern[ 1 ] )
{
new_state( STATE_READ_IDENTIFICATION );
}
else if( m_command[ 0 ] == COMMAND_WRITE && m_command[ 1 ] == ( m_unique_pattern[ 0 ] | CYCLE_NORMAL ) && m_command[ 2 ] == m_unique_pattern[ 1 ] )
{
new_state( STATE_READ_IDENTIFICATION );
}
else if( m_command[ 0 ] == COMMAND_WRITE && m_command[ 1 ] == ( m_unique_pattern[ 0 ] | CYCLE_PROGRAM ) && m_command[ 2 ] == m_unique_pattern[ 1 ] )
{
new_state( STATE_WRITE_IDENTIFICATION );
}
else
{
new_state( STATE_STOP );
}
}
break;
case STATE_READ_IDENTIFICATION:
readbit( m_identification );
if( m_bit == 64 )
{
verboselog( 1, "<- identification %02x %02x %02x %02x %02x %02x %02x %02x\n",
m_identification[ 0 ], m_identification[ 1 ], m_identification[ 2 ], m_identification[ 3 ],
m_identification[ 4 ], m_identification[ 5 ], m_identification[ 6 ], m_identification[ 7 ] );
new_state( STATE_WRITE_COMPARE_REGISTER );
}
break;
case STATE_WRITE_COMPARE_REGISTER:
writebit( m_compare_register );
if( m_bit == 64 )
{
verboselog( 1, "-> compare register %02x %02x %02x %02x %02x %02x %02x %02x (%02x %02x %02x %02x %02x %02x %02x %02x)\n",
m_compare_register[ 0 ], m_compare_register[ 1 ], m_compare_register[ 2 ], m_compare_register[ 3 ],
m_compare_register[ 4 ], m_compare_register[ 5 ], m_compare_register[ 6 ], m_compare_register[ 7 ],
m_security_match[ 0 ], m_security_match[ 1 ], m_security_match[ 2 ], m_security_match[ 3 ],
m_security_match[ 4 ], m_security_match[ 5 ], m_security_match[ 6 ], m_security_match[ 7 ] );
if( memcmp( m_compare_register, m_security_match, sizeof( m_compare_register ) ) == 0 )
{
if( m_command[ 0 ] == COMMAND_READ )
{
new_state( STATE_READ_SECURE_MEMORY );
}
else
{
new_state( STATE_WRITE_SECURE_MEMORY );
}
}
else
{
new_state( STATE_OUTPUT_GARBLED_DATA );
}
}
break;
case STATE_READ_SECURE_MEMORY:
readbit( m_secure_memory );
if( m_bit == 128 )
{
verboselog( 1, "<- secure memory %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
m_secure_memory[ 0 ], m_secure_memory[ 1 ], m_secure_memory[ 2 ], m_secure_memory[ 3 ],
m_secure_memory[ 4 ], m_secure_memory[ 5 ], m_secure_memory[ 6 ], m_secure_memory[ 7 ],
m_secure_memory[ 8 ], m_secure_memory[ 9 ], m_secure_memory[ 10 ], m_secure_memory[ 11 ],
m_secure_memory[ 12 ], m_secure_memory[ 13 ], m_secure_memory[ 14 ], m_secure_memory[ 15 ] );
new_state( STATE_STOP );
}
break;
case STATE_WRITE_SECURE_MEMORY:
writebit( m_secure_memory );
if( m_bit == 128 )
{
verboselog( 1, "-> secure memory %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
m_secure_memory[ 0 ], m_secure_memory[ 1 ], m_secure_memory[ 2 ], m_secure_memory[ 3 ],
m_secure_memory[ 4 ], m_secure_memory[ 5 ], m_secure_memory[ 6 ], m_secure_memory[ 7 ],
m_secure_memory[ 8 ], m_secure_memory[ 9 ], m_secure_memory[ 10 ], m_secure_memory[ 11 ],
m_secure_memory[ 12 ], m_secure_memory[ 13 ], m_secure_memory[ 14 ], m_secure_memory[ 15 ] );
new_state( STATE_STOP );
}
break;
case STATE_WRITE_IDENTIFICATION:
writebit( m_identification );
if( m_bit == 64 )
{
verboselog( 1, "-> identification %02x %02x %02x %02x %02x %02x %02x %02x\n",
m_identification[ 0 ], m_identification[ 1 ], m_identification[ 2 ], m_identification[ 3 ],
m_identification[ 4 ], m_identification[ 5 ], m_identification[ 6 ], m_identification[ 7 ] );
new_state( STATE_WRITE_SECURITY_MATCH );
}
break;
case STATE_WRITE_SECURITY_MATCH:
writebit( m_security_match );
if( m_bit == 64 )
{
verboselog( 1, ">- security match %02x %02x %02x %02x %02x %02x %02x %02x\n",
m_security_match[ 0 ], m_security_match[ 1 ], m_security_match[ 2 ], m_security_match[ 3 ],
m_security_match[ 4 ], m_security_match[ 5 ], m_security_match[ 6 ], m_security_match[ 7 ] );
new_state( STATE_STOP );
}
break;
case STATE_OUTPUT_GARBLED_DATA:
if( !m_clk && m_command[ 0 ] == COMMAND_READ )
{
m_dqr = machine().rand() & 1;
m_bit++;
}
else if( m_clk && m_command[ 0 ] == COMMAND_WRITE )
{
m_bit++;
}
if( m_bit == 64 )
{
if( m_command[ 0 ] == COMMAND_READ )
{
verboselog( 1, "<- random\n" );
}
else
{
verboselog( 1, "-> ignore\n" );
}
new_state( STATE_STOP );
}
break;
}
}
}
WRITE_LINE_MEMBER( ds1204_device::write_dq )
{
if( m_dqw != state )
{
m_dqw = state;
verboselog( 2, "dqw=%d\n", m_dqw );
}
}
READ_LINE_MEMBER( ds1204_device::read_dq )
{
if( m_dqr == DQ_HIGH_IMPEDANCE )
{
verboselog( 2, "dqr=high impedance\n" );
return 0;
}
verboselog( 2, "dqr=%d (bit=%d)\n", m_dqr, m_bit );
return m_dqr;
}