// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
#include "emu.h"
#include "machine/nscsi_cd.h"
#include "imagedev/chd_cd.h"
#define VERBOSE 1
#include "logmacro.h"
DEFINE_DEVICE_TYPE(NSCSI_CDROM, nscsi_cdrom_device, "scsi_cdrom", "SCSI CD-ROM")
nscsi_cdrom_device::nscsi_cdrom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
nscsi_full_device(mconfig, NSCSI_CDROM, tag, owner, clock), cdrom(nullptr), bytes_per_block(bytes_per_sector), lba(0), cur_sector(0)
{
}
void nscsi_cdrom_device::device_start()
{
nscsi_full_device::device_start();
save_item(NAME(sector_buffer));
save_item(NAME(lba));
save_item(NAME(cur_sector));
save_item(NAME(bytes_per_block));
}
void nscsi_cdrom_device::device_reset()
{
nscsi_full_device::device_reset();
cdrom = subdevice<cdrom_image_device>("image")->get_cdrom_file();
lba = 0;
cur_sector = -1;
}
MACHINE_CONFIG_START(nscsi_cdrom_device::device_add_mconfig)
MCFG_CDROM_ADD("image")
MCFG_CDROM_INTERFACE("cdrom")
MACHINE_CONFIG_END
void nscsi_cdrom_device::set_block_size(u32 block_size)
{
assert_always(!started(), "block size should not be set after device start");
assert_always(bytes_per_sector % block_size == 0, "block size must be a factor of sector size");
bytes_per_block = block_size;
};
uint8_t nscsi_cdrom_device::scsi_get_data(int id, int pos)
{
if(id != 2)
return nscsi_full_device::scsi_get_data(id, pos);
int sector = (lba * bytes_per_block + pos) / bytes_per_sector;
if(sector != cur_sector) {
cur_sector = sector;
if(!cdrom_read_data(cdrom, sector, sector_buffer, CD_TRACK_MODE1)) {
LOG("CD READ ERROR sector %d!\n", sector);
std::fill_n(sector_buffer, sizeof(sector_buffer), 0);
}
}
return sector_buffer[pos & (bytes_per_sector - 1)];
}
void nscsi_cdrom_device::return_no_cd()
{
sense(false, 3);
scsi_status_complete(SS_CHECK_CONDITION);
}
void nscsi_cdrom_device::scsi_command()
{
int blocks;
switch(scsi_cmdbuf[0]) {
case SC_TEST_UNIT_READY:
LOG("command TEST UNIT READY\n");
if(cdrom)
scsi_status_complete(SS_GOOD);
else
return_no_cd();
break;
case SC_READ_6:
if(!cdrom) {
return_no_cd();
break;
}
lba = ((scsi_cmdbuf[1] & 0x1f)<<16) | (scsi_cmdbuf[2]<<8) | scsi_cmdbuf[3];
blocks = scsi_cmdbuf[4];
if(!blocks)
blocks = 256;
LOG("command READ start=%08x blocks=%04x\n", lba, blocks);
scsi_data_in(2, blocks*bytes_per_block);
scsi_status_complete(SS_GOOD);
break;
case SC_INQUIRY: {
int lun = get_lun(scsi_cmdbuf[1] >> 5);
LOG("command INQUIRY lun=%d EVPD=%d page=%d alloc=%02x link=%02x\n",
lun, scsi_cmdbuf[1] & 1, scsi_cmdbuf[2], scsi_cmdbuf[4], scsi_cmdbuf[5]);
if(lun) {
bad_lun();
return;
}
int page = scsi_cmdbuf[2];
int size = scsi_cmdbuf[4];
switch(page) {
case 0:
std::fill_n(scsi_cmdbuf, 148, 0);
// vendor and product information must be padded with spaces
std::fill_n(&scsi_cmdbuf[8], 28, 0x20);
scsi_cmdbuf[0] = 0x05; // device is present, device is CD/DVD (MMC-3)
scsi_cmdbuf[1] = 0x80; // media is removable
scsi_cmdbuf[2] = 0x05; // device complies with SPC-3 standard
scsi_cmdbuf[3] = 0x02; // response data format = SPC-3 standard
// some Konami games freak out if this isn't "Sony", so we'll lie
// this is the actual drive on my Nagano '98 board
strncpy((char *)&scsi_cmdbuf[8], "Sony", 4);
strncpy((char *)&scsi_cmdbuf[16], "CDU-76S", 7);
strncpy((char *)&scsi_cmdbuf[32], "1.0", 3);
if(size > 148)
size = 148;
scsi_data_in(SBUF_MAIN, size);
break;
}
scsi_status_complete(SS_GOOD);
break;
}
case SC_START_STOP_UNIT:
LOG("command START STOP UNIT\n");
scsi_status_complete(SS_GOOD);
break;
case SC_READ_CAPACITY: {
if(!cdrom) {
return_no_cd();
break;
}
LOG("command READ CAPACITY\n");
// get the last used block on the disc
const uint32_t temp = cdrom_get_track_start(cdrom, 0xaa) * (bytes_per_sector / bytes_per_block) - 1;
scsi_cmdbuf[0] = (temp>>24) & 0xff;
scsi_cmdbuf[1] = (temp>>16) & 0xff;
scsi_cmdbuf[2] = (temp>>8) & 0xff;
scsi_cmdbuf[3] = (temp & 0xff);
scsi_cmdbuf[4] = 0;
scsi_cmdbuf[5] = 0;
scsi_cmdbuf[6] = (bytes_per_block>>8)&0xff;
scsi_cmdbuf[7] = (bytes_per_block & 0xff);
scsi_data_in(SBUF_MAIN, 8);
scsi_status_complete(SS_GOOD);
break;
}
case SC_READ_10:
if(!cdrom) {
return_no_cd();
break;
}
lba = (scsi_cmdbuf[2]<<24) | (scsi_cmdbuf[3]<<16) | (scsi_cmdbuf[4]<<8) | scsi_cmdbuf[5];
blocks = (scsi_cmdbuf[7] << 8) | scsi_cmdbuf[8];
LOG("command READ EXTENDED start=%08x blocks=%04x\n", lba, blocks);
scsi_data_in(2, blocks*bytes_per_block);
scsi_status_complete(SS_GOOD);
break;
case SC_MODE_SENSE_6: {
int lun = get_lun(scsi_cmdbuf[1] >> 5);
LOG("command MODE SENSE 6 lun=%d page=%02x alloc=%02x link=%02x\n",
lun, scsi_cmdbuf[2] & 0x3f, scsi_cmdbuf[4], scsi_cmdbuf[5]);
if(lun) {
bad_lun();
return;
}
int page = scsi_cmdbuf[2] & 0x3f;
int size = scsi_cmdbuf[4];
int pos = 1;
scsi_cmdbuf[pos++] = 0x00; // medium type
scsi_cmdbuf[pos++] = 0x80; // WP, cache
// get the last used block on the disc
const uint32_t temp = cdrom_get_track_start(cdrom, 0xaa) * (bytes_per_sector / bytes_per_block) - 1;
scsi_cmdbuf[pos++] = 0x08; // Block descriptor length
scsi_cmdbuf[pos++] = (temp>>24) & 0xff;
scsi_cmdbuf[pos++] = (temp>>16) & 0xff;
scsi_cmdbuf[pos++] = (temp>>8) & 0xff;
scsi_cmdbuf[pos++] = (temp & 0xff);
scsi_cmdbuf[pos++] = 0;
scsi_cmdbuf[pos++] = 0;
scsi_cmdbuf[pos++] = (bytes_per_block>>8)&0xff;
scsi_cmdbuf[pos++] = (bytes_per_block & 0xff);
int pmax = page == 0x3f ? 0x3e : page;
int pmin = page == 0x3f ? 0x00 : page;
for(int page=pmax; page >= pmin; page--) {
switch(page) {
case 0x00: // Unit attention parameters page (weird)
scsi_cmdbuf[pos++] = 0x80; // PS, page id
scsi_cmdbuf[pos++] = 0x02; // Page length
scsi_cmdbuf[pos++] = 0x00; // Meh
scsi_cmdbuf[pos++] = 0x00; // Double meh
break;
case 0x02: // Disconnect/reconnect control parameters (guessed)
scsi_cmdbuf[pos++] = 0x82; // PS, page id
scsi_cmdbuf[pos++] = 0x0e; // Page length
scsi_cmdbuf[pos++] = 0xe6; // Buffer full ratio, 90%
scsi_cmdbuf[pos++] = 0x1a; // Buffer empty ratio, 10%
scsi_cmdbuf[pos++] = 0x00; // Bus inactivity limit, 0
scsi_cmdbuf[pos++] = 0x00;
scsi_cmdbuf[pos++] = 0x00; // Disconnect time limit, 0
scsi_cmdbuf[pos++] = 0x00;
scsi_cmdbuf[pos++] = 0x00; // Connect time limit, 0
scsi_cmdbuf[pos++] = 0x00;
scsi_cmdbuf[pos++] = 0x00; // Maximum burst size, 0
scsi_cmdbuf[pos++] = 0x00;
scsi_cmdbuf[pos++] = 0x00; // EMDP, Dimm, DTDC
scsi_cmdbuf[pos++] = 0x00; // Reserved
scsi_cmdbuf[pos++] = 0x00; // Reserved
scsi_cmdbuf[pos++] = 0x00; // Reserved
break;
default:
LOG("mode sense page %02x unhandled\n", page);
break;
}
}
scsi_cmdbuf[0] = pos;
if(pos > size)
pos = size;
scsi_data_in(0, pos);
scsi_status_complete(SS_GOOD);
break;
}
case SC_PREVENT_ALLOW_MEDIUM_REMOVAL:
// TODO: support eject prevention
LOG("command PREVENT ALLOW MEDIUM REMOVAL\n");
scsi_status_complete(SS_GOOD);
break;
default:
logerror("unhandled command %02x\n", scsi_cmdbuf[0]);
nscsi_full_device::scsi_command();
break;
}
}