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Diffstat (limited to 'src/devices/machine/ds1205.cpp')
-rw-r--r--src/devices/machine/ds1205.cpp391
1 files changed, 391 insertions, 0 deletions
diff --git a/src/devices/machine/ds1205.cpp b/src/devices/machine/ds1205.cpp
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+++ b/src/devices/machine/ds1205.cpp
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+// license:BSD-3-Clause
+// copyright-holders:smf, Carl
+/*
+ * ds1205.c
+ *
+ * MultiKey
+ *
+ */
+
+#include <stdio.h>
+#include "emu.h"
+#include "ds1205.h"
+
+#define VERBOSE_LEVEL ( 2 )
+
+inline void ATTR_PRINTF( 3, 4 ) ds1205_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: ds1205(%s) %s", machine().describe_context(), tag(), buf );
+ }
+}
+
+// device type definition
+const device_type DS1205 = device_creator<ds1205_device>;
+
+ds1205_device::ds1205_device( const machine_config &mconfig, const char *tag, device_t *owner, u32 clock )
+ : device_t( mconfig, DS1205, "DS1205", tag, owner, clock, "ds1205", __FILE__ ),
+ device_nvram_interface(mconfig, *this),
+ m_region(*this, DEVICE_SELF),
+ m_rst( 0 ),
+ m_clk( 0 ),
+ m_dqw( 0 ), m_dqr(0), m_state(0), m_bit(0)
+{
+}
+
+void ds1205_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 ) );
+ memset( m_scratchpad, 0, sizeof( m_scratchpad ) );
+
+ 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_scratchpad ) );
+ save_item( NAME( m_compare_register ) );
+ save_item( NAME( m_identification ) );
+ save_item( NAME( m_security_match ) );
+ save_item( NAME( m_secure_memory ) );
+}
+
+void ds1205_device::nvram_default()
+{
+ 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_identification ) + sizeof( m_security_match ) + sizeof( m_secure_memory );
+
+ if (!m_region.found())
+ {
+ logerror( "ds1205(%s) region not found\n", tag() );
+ }
+ else if( m_region->bytes() != expected_bytes )
+ {
+ logerror( "ds1205(%s) region length 0x%x expected 0x%x\n", tag(), m_region->bytes(), expected_bytes );
+ }
+ else
+ {
+ u8 *region = m_region->base();
+
+ for(int i = 0; i < 3; i++)
+ {
+ memcpy( m_identification[i], region, sizeof( m_identification[i] ) ); region += sizeof( m_identification[i] );
+ memcpy( m_security_match[i], region, sizeof( m_security_match[i] ) ); region += sizeof( m_security_match[i] );
+ memcpy( m_secure_memory[i], region, sizeof( m_secure_memory[i] ) ); region += sizeof( m_secure_memory[i] );
+ }
+ }
+}
+
+void ds1205_device::nvram_read( emu_file &file )
+{
+ for(int i = 0; i < 3; i++)
+ {
+ file.read( m_identification[i], sizeof( m_identification[i] ) );
+ file.read( m_security_match[i], sizeof( m_security_match[i] ) );
+ file.read( m_secure_memory[i], sizeof( m_secure_memory[i] ) );
+ }
+}
+
+void ds1205_device::nvram_write( emu_file &file )
+{
+ for(int i = 0; i < 3; i++)
+ {
+ file.write( m_identification[i], sizeof( m_identification[i] ) );
+ file.write( m_security_match[i], sizeof( m_security_match[i] ) );
+ file.write( m_secure_memory[i], sizeof( m_secure_memory[i] ) );
+ }
+}
+
+void ds1205_device::new_state( int state )
+{
+ m_state = state;
+ m_bit = 0;
+}
+
+void ds1205_device::writebit( u8 *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 ds1205_device::readbit( u8 *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( ds1205_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_DATA:
+ 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( ds1205_device::write_clk )
+{
+ if( m_clk != state )
+ {
+ m_clk = state;
+ verboselog( 2, "clk=%d state=%d (bit=%d)\n", m_clk, m_state, 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\n",
+ m_command[ 0 ], m_command[ 1 ], m_command[ 2 ] );
+
+ if( m_command[ 0 ] == COMMAND_GET_SCRATCHPAD && (m_command[ 1 ] & 0xc0) == 0xc0 && m_command[ 1 ] == ( ~m_command[ 2 ] & 0xff ) )
+ {
+ new_state( STATE_READ_SCRATCH );
+ }
+ else if( m_command[ 0 ] == COMMAND_GET_DATA && (m_command[ 1 ] & 0xc0) != 0xc0 && (m_command[ 1 ] & 0x3f) >= 0x10 && m_command[ 1 ] == ( ~m_command[ 2 ] & 0xff ) )
+ {
+ new_state( STATE_READ_IDENTIFICATION );
+ }
+ else if( m_command[ 0 ] == COMMAND_SET_SECURITY && (m_command[ 1 ] & 0xc0) != 0xc0 && !(m_command [ 1 ] & 0x3f) && m_command[ 1 ] == ( ~m_command[ 2 ] & 0xff ) )
+ {
+ new_state( STATE_READ_IDENTIFICATION );
+ }
+ else
+ {
+ new_state( STATE_STOP );
+ }
+ }
+ break;
+
+ case STATE_READ_IDENTIFICATION:
+ readbit( m_identification[ m_command[ 1 ] >> 6 ] );
+
+ if( m_bit == 64 )
+ {
+ int page = m_command [ 1 ] >> 6;
+ verboselog( 1, "<- identification %02x %02x %02x %02x %02x %02x %02x %02x\n",
+ m_identification[ page ][ 0 ], m_identification[ page ][ 1 ], m_identification[ page ][ 2 ], m_identification[ page ][ 3 ],
+ m_identification[ page ][ 4 ], m_identification[ page ][ 5 ], m_identification[ page ][ 6 ], m_identification[ page ][ 7 ] );
+
+ new_state( STATE_WRITE_COMPARE_REGISTER );
+ }
+ break;
+
+ case STATE_WRITE_COMPARE_REGISTER:
+ writebit( m_compare_register );
+
+ if( m_bit == 64 )
+ {
+ int page = m_command[ 1 ] >> 6;
+ 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[ page ][ 0 ], m_security_match[ page ][ 1 ], m_security_match[ page ][ 2 ], m_security_match[ page ][ 3 ],
+ m_security_match[ page ][ 4 ], m_security_match[ page ][ 5 ], m_security_match[ page ][ 6 ], m_security_match[ page ][ 7 ] );
+
+ if( memcmp( m_compare_register, m_security_match[ page ], sizeof( m_compare_register ) ) == 0 )
+ {
+ if( m_command[ 0 ] == COMMAND_GET_DATA )
+ {
+ new_state( STATE_READ_DATA );
+ }
+ else if( m_command[ 0 ] == COMMAND_GET_SCRATCHPAD)
+ {
+ new_state( STATE_READ_SCRATCH );
+ }
+ else if( m_command[ 0 ] == COMMAND_SET_SECURITY)
+ {
+ new_state( STATE_WRITE_IDENTIFICATION );
+ }
+ }
+ else
+ {
+ new_state( STATE_OUTPUT_GARBLED_DATA );
+ }
+ }
+ break;
+
+ case STATE_READ_DATA:
+ readbit( m_secure_memory[ m_command[ 1 ] >> 6 ] );
+
+ if( m_bit == 384 )
+ {
+ int page = m_command [ 1 ] >> 6;
+ verboselog( 1, "<- secure memory %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
+ m_secure_memory[ page ][ 0 ], m_secure_memory[ page ][ 1 ], m_secure_memory[ page ][ 2 ], m_secure_memory[ page ][ 3 ],
+ m_secure_memory[ page ][ 4 ], m_secure_memory[ page ][ 5 ], m_secure_memory[ page ][ 6 ], m_secure_memory[ page ][ 7 ],
+ m_secure_memory[ page ][ 8 ], m_secure_memory[ page ][ 9 ], m_secure_memory[ page ][ 10 ], m_secure_memory[ page ][ 11 ],
+ m_secure_memory[ page ][ 12 ], m_secure_memory[ page ][ 13 ], m_secure_memory[ page ][ 14 ], m_secure_memory[ page ][ 15 ] );
+
+ new_state( STATE_STOP );
+ }
+ break;
+
+ case STATE_READ_SCRATCH:
+ readbit( m_scratchpad );
+
+ if( m_bit == 512 )
+ {
+ verboselog( 1, "<- scratchpad %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
+ m_scratchpad[ 0 ], m_scratchpad[ 1 ], m_scratchpad[ 2 ], m_scratchpad[ 3 ],
+ m_scratchpad[ 4 ], m_scratchpad[ 5 ], m_scratchpad[ 6 ], m_scratchpad[ 7 ],
+ m_scratchpad[ 8 ], m_scratchpad[ 9 ], m_scratchpad[ 10 ], m_scratchpad[ 11 ],
+ m_scratchpad[ 12 ], m_scratchpad[ 13 ], m_scratchpad[ 14 ], m_scratchpad[ 15 ] );
+
+ new_state( STATE_STOP );
+ }
+ break;
+
+ case STATE_WRITE_IDENTIFICATION:
+ writebit( m_identification[ m_command[ 1 ] >> 6 ] );
+
+ if( m_bit == 64 )
+ {
+ int page = m_command[ 1 ] >> 6;
+ verboselog( 1, "-> identification %02x %02x %02x %02x %02x %02x %02x %02x\n",
+ m_identification[ page ][ 0 ], m_identification[ page ][ 1 ], m_identification[ page ][ 2 ], m_identification[ page ][ 3 ],
+ m_identification[ page ][ 4 ], m_identification[ page ][ 5 ], m_identification[ page ][ 6 ], m_identification[ page ][ 7 ] );
+
+ new_state( STATE_WRITE_SECURITY_MATCH );
+ }
+ break;
+
+ case STATE_WRITE_SECURITY_MATCH:
+ writebit( m_security_match[ m_command[ 1 ] >> 6 ] );
+
+ if( m_bit == 64 )
+ {
+ int page = m_command[ 1 ] >> 6;
+ verboselog( 1, ">- security match %02x %02x %02x %02x %02x %02x %02x %02x\n",
+ m_security_match[ page ][ 0 ], m_security_match[ page ][ 1 ], m_security_match[ page ][ 2 ], m_security_match[ page ][ 3 ],
+ m_security_match[ page ][ 4 ], m_security_match[ page ][ 5 ], m_security_match[ page ][ 6 ], m_security_match[ page ][ 7 ] );
+
+ new_state( STATE_STOP );
+ }
+ break;
+
+ case STATE_OUTPUT_GARBLED_DATA:
+ if( !m_clk && m_command[ 0 ] == COMMAND_GET_DATA )
+ {
+ m_dqr = machine().rand() & 1;
+ m_bit++;
+ }
+ else if( m_clk && m_command[ 0 ] == COMMAND_SET_DATA )
+ {
+ m_bit++;
+ }
+
+ if( m_bit == 64 )
+ {
+ if( m_command[ 0 ] == COMMAND_GET_DATA )
+ {
+ verboselog( 1, "<- random\n" );
+ }
+ else
+ {
+ verboselog( 1, "-> ignore\n" );
+ }
+
+ new_state( STATE_STOP );
+ }
+ break;
+ }
+ }
+}
+
+WRITE_LINE_MEMBER( ds1205_device::write_dq )
+{
+ if( m_dqw != state )
+ {
+ m_dqw = state;
+
+ verboselog( 2, "dqw=%d\n", m_dqw );
+ }
+}
+
+READ_LINE_MEMBER( ds1205_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;
+}