diff options
Diffstat (limited to 'src/devices/machine/x76f041.cpp')
| -rw-r--r-- | src/devices/machine/x76f041.cpp | 246 |
1 files changed, 234 insertions, 12 deletions
diff --git a/src/devices/machine/x76f041.cpp b/src/devices/machine/x76f041.cpp index 03fb5b65bf9..06b831eeda6 100644 --- a/src/devices/machine/x76f041.cpp +++ b/src/devices/machine/x76f041.cpp @@ -48,13 +48,15 @@ x76f041_device::x76f041_device( const machine_config &mconfig, const char *tag, m_bit( 0 ), m_byte( 0 ), m_command( 0 ), - m_address( 0 ) + m_address( 0 ), + m_is_password_accepted ( false ) { } void x76f041_device::device_start() { - memset( m_write_buffer, 0, sizeof( m_write_buffer ) ); + std::fill( std::begin( m_write_buffer ), std::end( m_write_buffer ), 0 ); + std::fill( std::begin( m_password_temp ), std::end( m_password_temp ), 0 ); save_item( NAME( m_cs ) ); save_item( NAME( m_rst ) ); @@ -67,6 +69,7 @@ void x76f041_device::device_start() save_item( NAME( m_byte ) ); save_item( NAME( m_command ) ); save_item( NAME( m_address ) ); + save_item( NAME( m_is_password_accepted ) ); save_item( NAME( m_write_buffer ) ); save_item( NAME( m_response_to_reset ) ); save_item( NAME( m_write_password ) ); @@ -74,6 +77,26 @@ void x76f041_device::device_start() save_item( NAME( m_configuration_password ) ); save_item( NAME( m_configuration_registers ) ); save_item( NAME( m_data ) ); + save_item( NAME( m_password_temp ) ); +} + +void x76f041_device::device_reset() +{ + std::fill( std::begin( m_write_buffer ), std::end( m_write_buffer ), 0 ); + std::fill( std::begin( m_password_temp ), std::end( m_password_temp ), 0 ); + + m_cs = 0; + m_rst = 0; + m_scl = 0; + m_sdaw = 0; + m_sdar = 0; + m_state = STATE_STOP; + m_shift = 0; + m_bit = 0; + m_byte = 0; + m_command = 0; + m_address = 0; + m_is_password_accepted = false; } WRITE_LINE_MEMBER( x76f041_device::write_cs ) @@ -128,6 +151,15 @@ uint8_t *x76f041_device::password() case COMMAND_READ: return m_read_password; + case COMMAND_CONFIGURATION: + if( m_address == CONFIGURATION_PROGRAM_WRITE_PASSWORD ) + return m_write_password; + + if( m_address == CONFIGURATION_PROGRAM_READ_PASSWORD ) + return m_read_password; + + return m_configuration_password; + default: return m_configuration_password; } @@ -135,6 +167,9 @@ uint8_t *x76f041_device::password() void x76f041_device::password_ok() { + if( m_configuration_registers[ CONFIG_CR ] & CR_RETRY_COUNTER_RESET_BIT ) + m_configuration_registers[ CONFIG_RC ] = 0; + switch( m_command & 0xe0 ) { case COMMAND_WRITE: @@ -144,7 +179,7 @@ void x76f041_device::password_ok() m_state = STATE_READ_DATA; break; case COMMAND_WRITE_USE_CONFIGURATION_PASSWORD: - m_state = STATE_WRITE_DATA; + m_state = STATE_CONFIGURATION_WRITE_DATA; break; case COMMAND_READ_USE_CONFIGURATION_PASSWORD: m_state = STATE_READ_DATA; @@ -153,14 +188,22 @@ void x76f041_device::password_ok() switch( m_address ) { case CONFIGURATION_PROGRAM_WRITE_PASSWORD: + m_state = STATE_PROGRAM_WRITE_PASSWORD; + m_byte = 0; break; case CONFIGURATION_PROGRAM_READ_PASSWORD: + m_state = STATE_PROGRAM_READ_PASSWORD; + m_byte = 0; break; case CONFIGURATION_PROGRAM_CONFIGURATION_PASSWORD: + m_state = STATE_PROGRAM_CONFIGURATION_PASSWORD; + m_byte = 0; break; case CONFIGURATION_RESET_WRITE_PASSWORD: + m_state = STATE_RESET_WRITE_PASSWORD; break; case CONFIGURATION_RESET_READ_PASSWORD: + m_state = STATE_RESET_READ_PASSWORD; break; case CONFIGURATION_PROGRAM_CONFIGURATION_REGISTERS: m_state = STATE_WRITE_CONFIGURATION_REGISTERS; @@ -171,8 +214,10 @@ void x76f041_device::password_ok() m_byte = 0; break; case CONFIGURATION_MASS_PROGRAM: + m_state = STATE_MASS_PROGRAM; break; case CONFIGURATION_MASS_ERASE: + m_state = STATE_MASS_ERASE; break; default: break; @@ -182,21 +227,56 @@ void x76f041_device::password_ok() void x76f041_device::load_address() { - /* todo: handle other bcr bits */ - int bcr; - m_address = m_shift; verboselog( 1, "-> address: %02x\n", m_address ); - if( ( m_command & 1 ) == 0 ) + if( ( m_configuration_registers[ CONFIG_CR ] & CR_RETRY_COUNTER_ENABLE_BIT ) != 0 && + m_configuration_registers[ CONFIG_RR ] == m_configuration_registers[ CONFIG_RC ] && + ( m_configuration_registers[ CONFIG_CR ] & CR_UNAUTHORIZED_ACCESS_BITS ) == 0x80 ) { - bcr = m_configuration_registers[ CONFIG_BCR1 ]; + // No commands are allowed + verboselog( 1, "unauthorized access rejected\n" ); + m_state = STATE_STOP; + m_sdar = 1; + m_byte = 0; + return; } - else + + if( ( m_command & 0xe0 ) == COMMAND_CONFIGURATION ) { - bcr = m_configuration_registers[ CONFIG_BCR2 ]; + // Configuration commands can be used regardless of array control register bits + if( m_address == CONFIGURATION_RESET_WRITE_PASSWORD || + m_address == CONFIGURATION_RESET_READ_PASSWORD || + m_address == CONFIGURATION_MASS_PROGRAM || + m_address == CONFIGURATION_MASS_ERASE ) + { + verboselog( 1, "password not required\n" ); + password_ok(); + } + else + { + verboselog( 1, "send password\n" ); + m_state = STATE_LOAD_PASSWORD; + m_byte = 0; + } + + return; + } + + if( ( m_configuration_registers[ CONFIG_CR ] & CR_RETRY_COUNTER_ENABLE_BIT ) != 0 && + m_configuration_registers[ CONFIG_RR ] == m_configuration_registers[ CONFIG_RC ] && + ( m_configuration_registers[ CONFIG_CR ] & CR_UNAUTHORIZED_ACCESS_BITS ) != 0x80 ) + { + // Only configuration commands are allowed + verboselog( 1, "unauthorized access rejected\n" ); + m_state = STATE_STOP; + m_sdar = 1; + m_byte = 0; + return; } + + int bcr = m_configuration_registers[ ( m_command & 1 ) ? CONFIG_BCR2 : CONFIG_BCR1 ]; if( ( m_address & 0x80 ) != 0 ) { bcr >>= 4; @@ -208,7 +288,8 @@ void x76f041_device::load_address() /* todo: find out when this is really checked. */ verboselog( 1, "command not allowed\n" ); m_state = STATE_STOP; - m_sdar = 0; + m_sdar = 1; + m_byte = 0; } else if( ( ( m_command & 0xe0 ) == COMMAND_WRITE && ( bcr & BCR_X ) == 0 ) || ( ( m_command & 0xe0 ) == COMMAND_READ && ( bcr & BCR_Y ) == 0 ) ) @@ -272,7 +353,15 @@ WRITE_LINE_MEMBER( x76f041_device::write_scl ) case STATE_LOAD_PASSWORD: case STATE_VERIFY_PASSWORD: case STATE_WRITE_DATA: + case STATE_CONFIGURATION_WRITE_DATA: case STATE_WRITE_CONFIGURATION_REGISTERS: + case STATE_PROGRAM_WRITE_PASSWORD: + case STATE_PROGRAM_READ_PASSWORD: + case STATE_PROGRAM_CONFIGURATION_PASSWORD: + case STATE_RESET_WRITE_PASSWORD: + case STATE_RESET_READ_PASSWORD: + case STATE_MASS_PROGRAM: + case STATE_MASS_ERASE: if( m_scl == 0 && state != 0 ) { if( m_bit < 8 ) @@ -311,6 +400,16 @@ WRITE_LINE_MEMBER( x76f041_device::write_scl ) if( m_byte == sizeof( m_write_buffer ) ) { m_state = STATE_VERIFY_PASSWORD; + + // Perform the password acceptance check before verify password because + // password verify ack is spammed and will quickly overflow the + // retry counter. + m_is_password_accepted = memcmp( password(), m_write_buffer, sizeof( m_write_buffer ) ) == 0; + if( !m_is_password_accepted ) + { + if( m_configuration_registers[ CONFIG_CR ] & CR_RETRY_COUNTER_ENABLE_BIT ) + m_configuration_registers[ CONFIG_RC ]++; + } } break; @@ -321,7 +420,7 @@ WRITE_LINE_MEMBER( x76f041_device::write_scl ) if( m_shift == 0xc0 ) { /* todo: this should take 10ms before it returns ok. */ - if( memcmp( password(), m_write_buffer, sizeof( m_write_buffer ) ) == 0 ) + if( m_is_password_accepted ) { password_ok(); } @@ -338,6 +437,36 @@ WRITE_LINE_MEMBER( x76f041_device::write_scl ) if( m_byte == sizeof( m_write_buffer ) ) { + int bcr = m_configuration_registers[ ( m_command & 1 ) ? CONFIG_BCR2 : CONFIG_BCR1 ]; + if( ( m_address & 0x80 ) != 0 ) + { + bcr >>= 4; + } + + if( ( bcr & ( BCR_Z | BCR_T ) ) == BCR_T ) + { + // Bits in the data can only be set, not cleared, when in program only mode + bool is_unauthorized_write = false; + + for( m_byte = 0; m_byte < sizeof( m_write_buffer ); m_byte++ ) + { + int offset = data_offset(); + if( m_write_buffer[ m_byte ] < m_data[ offset ] ) + { + verboselog( 1, "tried to unset bits while in program only mode\n" ); + is_unauthorized_write = true; + break; + } + } + + if( is_unauthorized_write ) + { + m_sdar = 1; + m_byte = 0; + break; + } + } + for( m_byte = 0; m_byte < sizeof( m_write_buffer ); m_byte++ ) { int offset = data_offset(); @@ -350,6 +479,15 @@ WRITE_LINE_MEMBER( x76f041_device::write_scl ) } break; + + case STATE_CONFIGURATION_WRITE_DATA: + // Unlike normal writes, configuration writes aren't required to be exactly 8 bytes + // TODO: Store data in a temporary buffer until the proper end of the command before writing + verboselog( 2, "-> data: %02x\n", m_shift ); + m_data[ data_offset() ] = m_shift; + m_byte++; + break; + case STATE_WRITE_CONFIGURATION_REGISTERS: verboselog( 1, "-> configuration register[ %d ]: %02x\n", m_byte, m_shift ); /* todo: write after all bytes received? */ @@ -360,6 +498,90 @@ WRITE_LINE_MEMBER( x76f041_device::write_scl ) m_byte = 0; } break; + + case STATE_PROGRAM_WRITE_PASSWORD: + verboselog( 1, "-> program write password[ %d ]: %02x\n", m_byte, m_shift ); + m_password_temp[ m_byte++ ] = m_shift; + + if( m_byte == sizeof( m_password_temp ) ) + { + // Read in the password twice and if the two copies match then write it to the password field + if( memcmp( &m_password_temp[ 0 ], &m_password_temp[ 8 ], sizeof( m_write_password ) ) == 0 ) + { + std::copy_n( std::begin( m_password_temp ), sizeof( m_write_password ), std::begin ( m_write_password ) ); + } + else { + m_sdar = 1; + } + + std::fill( std::begin( m_password_temp ), std::end( m_password_temp ), 0 ); + + m_byte = 0; + } + break; + + case STATE_PROGRAM_READ_PASSWORD: + verboselog( 1, "-> program read password[ %d ]: %02x\n", m_byte, m_shift ); + m_password_temp[ m_byte++ ] = m_shift; + + if( m_byte == sizeof( m_password_temp ) ) + { + if( memcmp( &m_password_temp[ 0 ], &m_password_temp[ 8 ], sizeof( m_read_password ) ) == 0 ) + { + std::copy_n( std::begin( m_password_temp ), sizeof( m_read_password ), std::begin ( m_read_password ) ); + } + else { + m_sdar = 1; + } + + std::fill( std::begin( m_password_temp ), std::end( m_password_temp ), 0 ); + + m_byte = 0; + } + break; + + case STATE_PROGRAM_CONFIGURATION_PASSWORD: + verboselog( 1, "-> program configuration password[ %d ]: %02x\n", m_byte, m_shift ); + m_password_temp[ m_byte++ ] = m_shift; + + if( m_byte == sizeof( m_password_temp ) ) + { + if( memcmp( &m_password_temp[ 0 ], &m_password_temp[ 8 ], sizeof( m_configuration_password ) ) == 0 ) + { + std::copy_n( std::begin( m_password_temp ), sizeof( m_configuration_password ), std::begin ( m_configuration_password ) ); + } + else { + m_sdar = 1; + } + + std::fill( std::begin( m_password_temp ), std::end( m_password_temp ), 0 ); + + m_byte = 0; + } + break; + + case STATE_RESET_WRITE_PASSWORD: + verboselog( 1, "-> reset write password\n" ); + std::fill( std::begin( m_write_password ), std::end( m_write_password ), 0 ); + break; + + case STATE_RESET_READ_PASSWORD: + verboselog( 1, "-> reset read password\n" ); + std::fill( std::begin( m_read_password ), std::end( m_read_password ), 0 ); + break; + + case STATE_MASS_PROGRAM: + case STATE_MASS_ERASE: + { + const uint8_t fill = m_state == STATE_MASS_ERASE ? 0xff : 0; + verboselog( 1, "-> mass erase %02x\n", fill ); + std::fill( std::begin( m_data ), std::end( m_data ), fill ); + std::fill( std::begin( m_configuration_password ), std::end( m_configuration_password ), fill ); + std::fill( std::begin( m_configuration_registers ), std::end( m_configuration_registers ), fill ); + std::fill( std::begin( m_write_password ), std::end( m_write_password ), fill ); + std::fill( std::begin( m_read_password ), std::end( m_read_password ), fill ); + break; + } } m_bit = 0; |
