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-rw-r--r--src/devices/machine/akiko.cpp927
1 files changed, 927 insertions, 0 deletions
diff --git a/src/devices/machine/akiko.cpp b/src/devices/machine/akiko.cpp
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+++ b/src/devices/machine/akiko.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Mariusz Wojcieszek
+/***************************************************************************
+
+ Akiko
+
+ ASIC used in the Amiga CD32. Commodore Part number 391563-01.
+
+ - CD-ROM controller
+ - Builtin 1KB NVRAM
+ - Chunky to planar converter
+ - 2x CIA chips
+
+***************************************************************************/
+
+#include "akiko.h"
+#include "includes/amiga.h"
+#include "imagedev/chd_cd.h"
+#include "coreutil.h"
+
+
+//**************************************************************************
+// CONSTANTS / MACROS
+//**************************************************************************
+
+#define LOG_AKIKO 0
+#define LOG_AKIKO_CD 0
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type AKIKO = &device_creator<akiko_device>;
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+static MACHINE_CONFIG_FRAGMENT( akiko )
+MACHINE_CONFIG_END
+
+machine_config_constructor akiko_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( akiko );
+}
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// akiko_device - constructor
+//-------------------------------------------------
+
+akiko_device::akiko_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, AKIKO, "CBM AKIKO", tag, owner, clock, "akiko", __FILE__),
+ m_c2p_input_index(0),
+ m_c2p_output_index(0),
+ m_i2c_scl_out(0),
+ m_i2c_scl_dir(0),
+ m_i2c_sda_out(0),
+ m_i2c_sda_dir(0),
+ m_cdrom_track_index(0),
+ m_cdrom_lba_start(0),
+ m_cdrom_lba_end(0),
+ m_cdrom_lba_cur(0),
+ m_cdrom_readmask(0),
+ m_cdrom_readreqmask(0),
+ m_cdrom_dmacontrol(0),
+ m_cdrom_numtracks(0),
+ m_cdrom_speed(0),
+ m_cdrom_cmd_start(0),
+ m_cdrom_cmd_end(0),
+ m_cdrom_cmd_resp(0),
+ m_cdda(NULL),
+ m_cdrom(NULL),
+ m_cdrom_toc(NULL),
+ m_dma_timer(NULL),
+ m_frame_timer(NULL),
+ m_cdrom_is_device(0),
+ m_scl_w(*this),
+ m_sda_r(*this),
+ m_sda_w(*this)
+{
+ for (int i = 0; i < 8; i++)
+ {
+ m_c2p_input_buffer[i] = 0;
+ m_c2p_output_buffer[i] = 0;
+ }
+
+ for (int i = 0; i < 2; i++)
+ {
+ m_cdrom_status[i] = 0;
+ m_cdrom_address[i] = 0;
+ }
+}
+
+
+//-------------------------------------------------
+// set_cputag - set cpu tag for cpu we working on
+//-------------------------------------------------
+
+void akiko_device::set_cputag(device_t &device, const char *tag)
+{
+ akiko_device &akiko = downcast<akiko_device &>(device);
+ akiko.m_cputag = tag;
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void akiko_device::device_start()
+{
+ // resolve callbacks
+ m_scl_w.resolve_safe();
+ m_sda_r.resolve_safe(1);
+ m_sda_w.resolve_safe();
+
+ m_c2p_input_index = 0;
+ m_c2p_output_index = 0;
+
+ m_i2c_scl_out = 0;
+ m_i2c_scl_dir = 0;
+ m_i2c_sda_out = 0;
+ m_i2c_sda_dir = 0;
+
+ m_cdrom_status[0] = m_cdrom_status[1] = 0;
+ m_cdrom_address[0] = m_cdrom_address[1] = 0;
+ m_cdrom_track_index = 0;
+ m_cdrom_lba_start = 0;
+ m_cdrom_lba_end = 0;
+ m_cdrom_lba_cur = 0;
+ m_cdrom_readmask = 0;
+ m_cdrom_readreqmask = 0;
+ m_cdrom_dmacontrol = 0;
+ m_cdrom_numtracks = 0;
+ m_cdrom_speed = 0;
+ m_cdrom_cmd_start = 0;
+ m_cdrom_cmd_end = 0;
+ m_cdrom_cmd_resp = 0;
+
+ device_t *cpu = machine().device(m_cputag);
+ m_space = &cpu->memory().space(AS_PROGRAM);
+
+ m_cdrom_toc = NULL;
+ m_dma_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(akiko_device::dma_proc), this));
+ m_frame_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(akiko_device::frame_proc), this));
+ m_cdda = machine().device<cdda_device>("cdda");
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void akiko_device::device_reset()
+{
+ cdrom_image_device *cddevice = machine().device<cdrom_image_device>("cdrom");
+
+ if (cddevice != NULL)
+ {
+ // MESS case
+ m_cdrom = cddevice->get_cdrom_file();
+ m_cdrom_is_device = 1;
+ }
+ else
+ {
+ // MAME case
+ m_cdrom = cdrom_open(get_disk_handle(machine(), ":cdrom"));
+ m_cdrom_is_device = 0;
+ }
+
+ /* create the TOC table */
+ if ( m_cdrom != NULL && cdrom_get_last_track(m_cdrom) )
+ {
+ UINT8 *p;
+ int i, addrctrl = cdrom_get_adr_control( m_cdrom, 0 );
+ UINT32 discend;
+
+ discend = cdrom_get_track_start(m_cdrom,cdrom_get_last_track(m_cdrom)-1);
+ discend += cdrom_get_toc(m_cdrom)->tracks[cdrom_get_last_track(m_cdrom)-1].frames;
+ discend = lba_to_msf(discend);
+
+ m_cdrom_numtracks = cdrom_get_last_track(m_cdrom)+3;
+
+ m_cdrom_toc = auto_alloc_array(machine(), UINT8, 13*m_cdrom_numtracks);
+ memset( m_cdrom_toc, 0, 13*m_cdrom_numtracks);
+
+ p = m_cdrom_toc;
+ p[1] = ((addrctrl & 0x0f) << 4) | ((addrctrl & 0xf0) >> 4);
+ p[3] = 0xa0; /* first track */
+ p[8] = 1;
+ p += 13;
+ p[1] = 0x01;
+ p[3] = 0xa1; /* last track */
+ p[8] = cdrom_get_last_track(m_cdrom);
+ p += 13;
+ p[1] = 0x01;
+ p[3] = 0xa2; /* disc end */
+ p[8] = (discend >> 16 ) & 0xff;
+ p[9] = (discend >> 8 ) & 0xff;
+ p[10] = discend & 0xff;
+ p += 13;
+
+ for( i = 0; i < cdrom_get_last_track(m_cdrom); i++ )
+ {
+ UINT32 trackpos = cdrom_get_track_start(m_cdrom,i);
+
+ trackpos = lba_to_msf(trackpos);
+ addrctrl = cdrom_get_adr_control( m_cdrom, i );
+
+ p[1] = ((addrctrl & 0x0f) << 4) | ((addrctrl & 0xf0) >> 4);
+ p[3] = dec_2_bcd( i+1 );
+ p[8] = (trackpos >> 16 ) & 0xff;
+ p[9] = (trackpos >> 8 ) & 0xff;
+ p[10] = trackpos & 0xff;
+
+ p += 13;
+ }
+ }
+
+}
+
+//-------------------------------------------------
+// device_stop - device-specific stop
+//-------------------------------------------------
+
+void akiko_device::device_stop()
+{
+ if (!m_cdrom_is_device)
+ {
+ if( m_cdrom )
+ {
+ cdrom_close(m_cdrom);
+ m_cdrom = (cdrom_file *)NULL;
+ }
+ }
+}
+
+void akiko_device::nvram_write(UINT32 data)
+{
+ m_i2c_scl_out = BIT(data, 31);
+ m_i2c_sda_out = BIT(data, 30);
+ m_i2c_scl_dir = BIT(data, 15);
+ m_i2c_sda_dir = BIT(data, 14);
+
+ m_scl_w(m_i2c_scl_out);
+ m_sda_w(m_i2c_sda_out);
+}
+
+UINT32 akiko_device::nvram_read()
+{
+ UINT32 v = 0;
+
+ if (m_i2c_scl_dir)
+ v |= m_i2c_scl_out << 31;
+
+ if (m_i2c_sda_dir)
+ v |= m_i2c_sda_out << 30;
+ else
+ v |= m_sda_r() << 30;
+
+ v |= m_i2c_scl_dir << 15;
+ v |= m_i2c_sda_dir << 14;
+
+ return v;
+}
+
+/*************************************
+ *
+ * Akiko Chunky to Planar converter
+ *
+ ************************************/
+
+void akiko_device::c2p_write(UINT32 data)
+{
+ m_c2p_input_buffer[m_c2p_input_index] = data;
+ m_c2p_input_index++;
+ m_c2p_input_index &= 7;
+ m_c2p_output_index = 0;
+}
+
+UINT32 akiko_device::c2p_read()
+{
+ UINT32 val;
+
+ if ( m_c2p_output_index == 0 )
+ {
+ int i;
+
+ for ( i = 0; i < 8; i++ )
+ m_c2p_output_buffer[i] = 0;
+
+ for (i = 0; i < 8 * 32; i++)
+ {
+ if (m_c2p_input_buffer[7 - (i >> 5)] & (1 << (i & 31)))
+ m_c2p_output_buffer[i & 7] |= 1 << (i >> 3);
+ }
+ }
+ m_c2p_input_index = 0;
+ val = m_c2p_output_buffer[m_c2p_output_index];
+ m_c2p_output_index++;
+ m_c2p_output_index &= 7;
+ return val;
+}
+
+static const char *const akiko_reg_names[] =
+{
+ /*0*/ "ID",
+ /*1*/ "CDROM STATUS 1",
+ /*2*/ "CDROM_STATUS 2",
+ /*3*/ "???",
+ /*4*/ "CDROM ADDRESS 1",
+ /*5*/ "CDROM ADDRESS 2",
+ /*6*/ "CDROM COMMAND 1",
+ /*7*/ "CDROM COMMAND 2",
+ /*8*/ "CDROM READMASK",
+ /*9*/ "CDROM DMACONTROL",
+ /*A*/ "???",
+ /*B*/ "???",
+ /*C*/ "NVRAM",
+ /*D*/ "???",
+ /*E*/ "C2P"
+};
+
+static const char* get_akiko_reg_name(int reg)
+{
+ if (reg < 0xf )
+ {
+ return akiko_reg_names[reg];
+ }
+ else
+ {
+ return "???";
+ }
+}
+
+/*************************************
+ *
+ * Akiko CDROM Controller
+ *
+ ************************************/
+
+void akiko_device::cdda_stop()
+{
+ if (m_cdda != NULL)
+ {
+ m_cdda->stop_audio();
+ m_frame_timer->reset( );
+ }
+}
+
+void akiko_device::cdda_play(UINT32 lba, UINT32 num_blocks)
+{
+ if (m_cdda != NULL)
+ {
+ m_cdda->start_audio(lba, num_blocks);
+ m_frame_timer->adjust( attotime::from_hz( 75 ) );
+ }
+}
+
+void akiko_device::cdda_pause(int pause)
+{
+ if (m_cdda != NULL)
+ {
+ if (m_cdda->audio_active() && m_cdda->audio_paused() != pause )
+ {
+ m_cdda->pause_audio(pause);
+
+ if ( pause )
+ {
+ m_frame_timer->reset( );
+ }
+ else
+ {
+ m_frame_timer->adjust( attotime::from_hz( 75 ) );
+ }
+ }
+ }
+}
+
+UINT8 akiko_device::cdda_getstatus(UINT32 *lba)
+{
+ if ( lba ) *lba = 0;
+
+ if (m_cdda != NULL)
+ {
+ if (m_cdda->audio_active())
+ {
+ if ( lba ) *lba = m_cdda->get_audio_lba();
+
+ if (m_cdda->audio_paused())
+ {
+ return 0x12; /* audio paused */
+ }
+ else
+ {
+ return 0x11; /* audio in progress */
+ }
+ }
+ else if (m_cdda->audio_ended())
+ {
+ return 0x13; /* audio ended */
+ }
+ }
+
+ return 0x15; /* no audio status */
+}
+
+void akiko_device::set_cd_status(UINT32 status)
+{
+ amiga_state *amiga = machine().driver_data<amiga_state>();
+
+ m_cdrom_status[0] |= status;
+
+ if ( m_cdrom_status[0] & m_cdrom_status[1] )
+ {
+ if (LOG_AKIKO_CD)
+ logerror("Akiko CD IRQ\n");
+
+ amiga->custom_chip_w(REG_INTREQ, INTENA_SETCLR | INTENA_PORTS);
+ }
+}
+
+TIMER_CALLBACK_MEMBER(akiko_device::frame_proc)
+{
+ (void)param;
+
+ if (m_cdda != NULL)
+ {
+ UINT8 s = cdda_getstatus(NULL);
+
+ if ( s == 0x11 )
+ {
+ set_cd_status(0x80000000); /* subcode ready */
+ }
+
+ m_frame_timer->adjust( attotime::from_hz( 75 ) );
+ }
+}
+
+static UINT32 lba_from_triplet( UINT8 *triplet )
+{
+ UINT32 r;
+
+ r = bcd_2_dec(triplet[0]) * (60*75);
+ r += bcd_2_dec(triplet[1]) * 75;
+ r += bcd_2_dec(triplet[2]);
+
+ return r;
+}
+
+TIMER_CALLBACK_MEMBER(akiko_device::dma_proc)
+{
+ UINT8 buf[2352];
+ int index;
+
+ if ( (m_cdrom_dmacontrol & 0x04000000) == 0 )
+ return;
+
+ if ( m_cdrom_readreqmask == 0 )
+ return;
+
+ index = (m_cdrom_lba_cur - m_cdrom_lba_start) & 0x0f;
+
+ if ( m_cdrom_readreqmask & ( 1 << index ) )
+ {
+ amiga_state *amiga = machine().driver_data<amiga_state>();
+ UINT32 track = cdrom_get_track( m_cdrom, m_cdrom_lba_cur );
+ UINT32 datasize = cdrom_get_toc( m_cdrom )->tracks[track].datasize;
+ UINT32 subsize = cdrom_get_toc( m_cdrom )->tracks[track].subsize;
+ int i;
+
+ UINT32 curmsf = lba_to_msf( m_cdrom_lba_cur );
+ memset( buf, 0, 16 );
+
+ buf[3] = m_cdrom_lba_cur - m_cdrom_lba_start;
+ memset( &buf[4], 0xff, 8 );
+
+ buf[12] = (curmsf >> 16) & 0xff;
+ buf[13] = (curmsf >> 8) & 0xff;
+ buf[14] = curmsf & 0xff;
+ buf[15] = 0x01; /* mode1 */
+
+ datasize = 2048;
+ if ( !cdrom_read_data( m_cdrom, m_cdrom_lba_cur, &buf[16], CD_TRACK_MODE1 ) )
+ {
+ logerror( "AKIKO: Read error trying to read sector %08x!\n", m_cdrom_lba_cur );
+ return;
+ }
+
+ if ( subsize )
+ {
+ if ( !cdrom_read_subcode( m_cdrom, m_cdrom_lba_cur, &buf[16+datasize] ) )
+ {
+ logerror( "AKIKO: Read error trying to read subcode for sector %08x!\n", m_cdrom_lba_cur );
+ return;
+ }
+ }
+
+ if (LOG_AKIKO_CD) logerror( "DMA: sector %d - address %08x\n", m_cdrom_lba_cur, m_cdrom_address[0] + (index*4096) );
+
+ for( i = 0; i < 2352; i += 2 )
+ {
+ UINT16 data;
+
+ data = buf[i];
+ data <<= 8;
+ data |= buf[i+1];
+
+ amiga->chip_ram_w(m_cdrom_address[0] + (index*4096) + i, data );
+ }
+
+ m_cdrom_readmask |= ( 1 << index );
+ m_cdrom_readreqmask &= ~( 1 << index );
+ m_cdrom_lba_cur++;
+ }
+
+ if ( m_cdrom_readreqmask == 0 )
+ set_cd_status(0x04000000);
+ else
+ m_dma_timer->adjust( attotime::from_usec( CD_SECTOR_TIME / m_cdrom_speed ) );
+}
+
+void akiko_device::start_dma()
+{
+ if ( m_cdrom_readreqmask == 0 )
+ return;
+
+ if ( m_cdrom_lba_start > m_cdrom_lba_end )
+ return;
+
+ if ( m_cdrom_speed == 0 )
+ return;
+
+ m_cdrom_lba_cur = m_cdrom_lba_start;
+
+ m_dma_timer->adjust( attotime::from_usec( CD_SECTOR_TIME / m_cdrom_speed ) );
+}
+
+void akiko_device::setup_response( int len, UINT8 *r1 )
+{
+ int resp_addr = m_cdrom_address[1];
+ UINT8 resp_csum = 0xff;
+ UINT8 resp_buffer[32];
+ int i;
+
+ memset( resp_buffer, 0, sizeof( resp_buffer ) );
+
+ for( i = 0; i < len; i++ )
+ {
+ resp_buffer[i] = r1[i];
+ resp_csum -= resp_buffer[i];
+ }
+
+ resp_buffer[len++] = resp_csum;
+
+ for( i = 0; i < len; i++ )
+ {
+ m_space->write_byte( resp_addr + ((m_cdrom_cmd_resp + i) & 0xff), resp_buffer[i] );
+ }
+
+ m_cdrom_cmd_resp = (m_cdrom_cmd_resp+len) & 0xff;
+
+ set_cd_status(0x10000000); /* new data available */
+}
+
+TIMER_CALLBACK_MEMBER( akiko_device::cd_delayed_cmd )
+{
+ UINT8 resp[32];
+ UINT8 cddastatus;
+
+ if ( m_cdrom_status[0] & 0x10000000 )
+ return;
+
+ cddastatus = cdda_getstatus(NULL);
+
+ if ( cddastatus == 0x11 || cddastatus == 0x12 )
+ return;
+
+ memset( resp, 0, sizeof( resp ) );
+ resp[0] = param;
+
+ param &= 0x0f;
+
+ if ( param == 0x05 )
+ {
+ if (LOG_AKIKO_CD) logerror( "AKIKO: Completing Command %d\n", param );
+
+ resp[0] = 0x06;
+
+ if ( m_cdrom == NULL || m_cdrom_numtracks == 0 )
+ {
+ resp[1] = 0x80;
+ setup_response( 15, resp );
+ }
+ else
+ {
+ resp[1] = 0x00;
+ memcpy( &resp[2], &m_cdrom_toc[13*m_cdrom_track_index], 13 );
+
+ m_cdrom_track_index = ( m_cdrom_track_index + 1 ) % m_cdrom_numtracks;
+
+ setup_response( 15, resp );
+ }
+ }
+}
+
+void akiko_device::update_cdrom()
+{
+ UINT8 resp[32], cmdbuf[32];
+
+ if ( m_cdrom_status[0] & 0x10000000 )
+ return;
+
+ while ( m_cdrom_cmd_start != m_cdrom_cmd_end )
+ {
+ UINT32 cmd_addr = m_cdrom_address[1] + 0x200 + m_cdrom_cmd_start;
+ int cmd = m_space->read_byte( cmd_addr );
+
+ memset( resp, 0, sizeof( resp ) );
+ resp[0] = cmd;
+
+ cmd &= 0x0f;
+
+ if (LOG_AKIKO_CD) logerror( "CDROM command: %02X\n", cmd );
+
+ if ( cmd == 0x02 ) /* pause audio */
+ {
+ resp[1] = 0x00;
+
+ if ( cdda_getstatus(NULL) == 0x11 )
+ resp[1] = 0x08;
+
+ cdda_pause(1);
+
+ m_cdrom_cmd_start = (m_cdrom_cmd_start+2) & 0xff;
+
+ setup_response( 2, resp );
+ }
+ else if ( cmd == 0x03 ) /* unpause audio (and check audiocd playing status) */
+ {
+ resp[1] = 0x00;
+
+ if ( cdda_getstatus(NULL) == 0x11 )
+ resp[1] = 0x08;
+
+ cdda_pause(0);
+
+ m_cdrom_cmd_start = (m_cdrom_cmd_start+2) & 0xff;
+
+ setup_response( 2, resp );
+ }
+ else if ( cmd == 0x04 ) /* seek/read/play cd multi command */
+ {
+ int i;
+ UINT32 startpos, endpos;
+
+ for( i = 0; i < 13; i++ )
+ {
+ cmdbuf[i] = m_space->read_byte( cmd_addr );
+ cmd_addr &= 0xffffff00;
+ cmd_addr += ( m_cdrom_cmd_start + i + 1 ) & 0xff;
+ }
+
+ m_cdrom_cmd_start = (m_cdrom_cmd_start+13) & 0xff;
+
+ if ( m_cdrom == NULL || m_cdrom_numtracks == 0 )
+ {
+ resp[1] = 0x80;
+ setup_response( 2, resp );
+ }
+ else
+ {
+ startpos = lba_from_triplet( &cmdbuf[1] );
+ endpos = lba_from_triplet( &cmdbuf[4] );
+
+ cdda_stop();
+
+ resp[1] = 0x00;
+
+ if ( cmdbuf[7] == 0x80 )
+ {
+ if (LOG_AKIKO_CD) logerror( "%s:AKIKO CD: Data read - start lba: %08x - end lba: %08x\n", machine().describe_context(), startpos, endpos );
+ m_cdrom_speed = (cmdbuf[8] & 0x40) ? 2 : 1;
+ m_cdrom_lba_start = startpos;
+ m_cdrom_lba_end = endpos;
+
+ resp[1] = 0x02;
+ }
+ else if ( cmdbuf[10] & 0x04 )
+ {
+ logerror( "AKIKO CD: Audio Play - start lba: %08x - end lba: %08x\n", startpos, endpos );
+ cdda_play(startpos, endpos - startpos);
+ resp[1] = 0x08;
+ }
+ else
+ {
+ if (LOG_AKIKO_CD) logerror( "AKIKO CD: Seek - start lba: %08x - end lba: %08x\n", startpos, endpos );
+ m_cdrom_track_index = 0;
+
+ for( i = 0; i < cdrom_get_last_track(m_cdrom); i++ )
+ {
+ if ( startpos <= cdrom_get_track_start( m_cdrom, i ) )
+ {
+ /* reset to 0 */
+ m_cdrom_track_index = i + 2;
+ m_cdrom_track_index %= m_cdrom_numtracks;
+ break;
+ }
+ }
+ }
+
+ setup_response( 2, resp );
+ }
+ }
+ else if ( cmd == 0x05 ) /* read toc */
+ {
+ m_cdrom_cmd_start = (m_cdrom_cmd_start+3) & 0xff;
+
+ machine().scheduler().timer_set( attotime::from_msec(1), timer_expired_delegate(FUNC(akiko_device::cd_delayed_cmd ), this), resp[0]);
+
+ break;
+ }
+ else if ( cmd == 0x06 ) /* read subq */
+ {
+ UINT32 lba;
+
+ resp[1] = 0x00;
+
+ (void)cdda_getstatus(&lba);
+
+ if ( lba > 0 )
+ {
+ UINT32 disk_pos;
+ UINT32 track_pos;
+ UINT32 track;
+ int addrctrl;
+
+ track = cdrom_get_track(m_cdrom, lba);
+ addrctrl = cdrom_get_adr_control(m_cdrom, track);
+
+ resp[2] = 0x00;
+ resp[3] = ((addrctrl & 0x0f) << 4) | ((addrctrl & 0xf0) >> 4);
+ resp[4] = dec_2_bcd(track+1);
+ resp[5] = 0; /* index */
+
+ disk_pos = lba_to_msf(lba);
+ track_pos = lba_to_msf(lba - cdrom_get_track_start(m_cdrom, track));
+
+ /* track position */
+ resp[6] = (track_pos >> 16) & 0xff;
+ resp[7] = (track_pos >> 8) & 0xff;
+ resp[8] = track_pos & 0xff;
+
+ /* disk position */
+ resp[9] = (disk_pos >> 24) & 0xff;
+ resp[10] = (disk_pos >> 16) & 0xff;
+ resp[11] = (disk_pos >> 8) & 0xff;
+ resp[12] = disk_pos & 0xff;
+ }
+ else
+ {
+ resp[1] = 0x80;
+ }
+
+ setup_response( 15, resp );
+ }
+ else if ( cmd == 0x07 ) /* check door status */
+ {
+ resp[1] = 0x01;
+
+ m_cdrom_cmd_start = (m_cdrom_cmd_start+2) & 0xff;
+
+ if ( m_cdrom == NULL || m_cdrom_numtracks == 0 )
+ resp[1] = 0x80;
+
+ setup_response( 20, resp );
+ break;
+ }
+ else
+ {
+ break;
+ }
+ }
+}
+
+READ32_MEMBER( akiko_device::read )
+{
+ UINT32 retval;
+
+ if ( LOG_AKIKO && offset < (0x30/4) )
+ {
+ logerror( "Reading AKIKO reg %0x [%s] at PC=%06x\n", offset, get_akiko_reg_name(offset), m_space->device().safe_pc() );
+ }
+
+ switch( offset )
+ {
+ case 0x00/4: /* ID */
+ if ( m_cdrom != NULL ) m_cdda->set_cdrom(m_cdrom);
+ return 0x0000cafe;
+
+ case 0x04/4: /* CDROM STATUS 1 */
+ return m_cdrom_status[0];
+
+ case 0x08/4: /* CDROM STATUS 2 */
+ return m_cdrom_status[1];
+
+ case 0x10/4: /* CDROM ADDRESS 1 */
+ return m_cdrom_address[0];
+
+ case 0x14/4: /* CDROM ADDRESS 2 */
+ return m_cdrom_address[1];
+
+ case 0x18/4: /* CDROM COMMAND 1 */
+ update_cdrom();
+ retval = m_cdrom_cmd_start;
+ retval <<= 8;
+ retval |= m_cdrom_cmd_resp;
+ retval <<= 8;
+ return retval;
+
+ case 0x1C/4: /* CDROM COMMAND 2 */
+ update_cdrom();
+ retval = m_cdrom_cmd_end;
+ retval <<= 16;
+ return retval;
+
+ case 0x20/4: /* CDROM DMA SECTOR READ MASK */
+ retval = m_cdrom_readmask << 16;
+ return retval;
+
+ case 0x24/4: /* CDROM DMA ENABLE? */
+ retval = m_cdrom_dmacontrol;
+ return retval;
+
+ case 0x30/4: /* NVRAM */
+ return nvram_read();
+
+ case 0x38/4: /* C2P */
+ return c2p_read();
+
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+WRITE32_MEMBER( akiko_device::write )
+{
+ if ( LOG_AKIKO && offset < (0x30/4) )
+ {
+ logerror( "Writing AKIKO reg %0x [%s] with %08x at PC=%06x\n", offset, get_akiko_reg_name(offset), data, m_space->device().safe_pc() );
+ }
+
+ switch( offset )
+ {
+ case 0x04/4: /* CDROM STATUS 1 */
+ m_cdrom_status[0] = data;
+ break;
+
+ case 0x08/4: /* CDROM STATUS 2 */
+ m_cdrom_status[1] = data;
+ m_cdrom_status[0] &= data;
+ break;
+
+ case 0x10/4: /* CDROM ADDRESS 1 */
+ m_cdrom_address[0] = data;
+ break;
+
+ case 0x14/4: /* CDROM ADDRESS 2 */
+ m_cdrom_address[1] = data;
+ break;
+
+ case 0x18/4: /* CDROM COMMAND 1 */
+ if ( ACCESSING_BITS_16_23 )
+ m_cdrom_cmd_start = ( data >> 16 ) & 0xff;
+
+ if ( ACCESSING_BITS_8_15 )
+ m_cdrom_cmd_resp = ( data >> 8 ) & 0xff;
+
+ update_cdrom();
+ break;
+
+ case 0x1C/4: /* CDROM COMMAND 2 */
+ if ( ACCESSING_BITS_16_23 )
+ m_cdrom_cmd_end = ( data >> 16 ) & 0xff;
+
+ update_cdrom();
+ break;
+
+ case 0x20/4: /* CDROM DMA SECTOR READ REQUEST WRITE */
+ if (LOG_AKIKO_CD) logerror( "Read Req mask W: data %08x - mem mask %08x\n", data, mem_mask );
+ if ( ACCESSING_BITS_16_31 )
+ {
+ m_cdrom_readreqmask = (data >> 16);
+ m_cdrom_readmask = 0;
+ }
+ break;
+
+ case 0x24/4: /* CDROM DMA ENABLE? */
+ if (LOG_AKIKO_CD) logerror( "DMA enable W: data %08x - mem mask %08x\n", data, mem_mask );
+ if ( ( m_cdrom_dmacontrol ^ data ) & 0x04000000 )
+ {
+ if ( data & 0x04000000 )
+ start_dma();
+ }
+ m_cdrom_dmacontrol = data;
+ break;
+
+ case 0x30/4:
+ nvram_write(data);
+ break;
+
+ case 0x38/4:
+ c2p_write(data);
+ break;
+
+ default:
+ break;
+ }
+}