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cdtv.cpp
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cdtv.cpp
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/*
* UAE - The Un*x Amiga Emulator
*
* CDTV DMAC/CDROM controller emulation
*
* Copyright 2004/2007-2010 Toni Wilen
*
* Thanks to Mark Knibbs <markk@clara.co.uk> for CDTV Technical information
*
*/
//#define ROMHACK
//#define ROMHACK2
//#define CDTV_SUB_DEBUG
//#define CDTV_DEBUG
//#define CDTV_DEBUG_CMD
//#define CDTV_DEBUG_6525
#include "sysconfig.h"
#include "sysdeps.h"
#include "options.h"
#include "memory.h"
#include "custom.h"
#include "newcpu.h"
#include "debug.h"
#include "cdtv.h"
#include "blkdev.h"
#include "gui.h"
#include "zfile.h"
#include "threaddep/thread.h"
#include "a2091.h"
#include "uae.h"
#include "savestate.h"
/* DMAC CNTR bits. */
#define CNTR_TCEN (1<<7)
#define CNTR_PREST (1<<6)
#define CNTR_PDMD (1<<5)
#define CNTR_INTEN (1<<4)
#define CNTR_DDIR (1<<3)
/* ISTR bits. */
#define ISTR_INTX (1<<8)
#define ISTR_INT_F (1<<7)
#define ISTR_INTS (1<<6)
#define ISTR_E_INT (1<<5)
#define ISTR_INT_P (1<<4)
#define ISTR_UE_INT (1<<3)
#define ISTR_OE_INT (1<<2)
#define ISTR_FF_FLG (1<<1)
#define ISTR_FE_FLG (1<<0)
#define MODEL_NAME "MATSHITA0.96"
/* also MATSHITA0.97 exists but is apparently rare */
#define MAX_SUBCODEBUFFER 16
static volatile int subcodebufferoffset, subcodebufferoffsetw, subcodeoffset;
static uae_u8 subcodebufferinuse[MAX_SUBCODEBUFFER];
static uae_u8 subcodebuffer[MAX_SUBCODEBUFFER * SUB_CHANNEL_SIZE];
static uae_sem_t sub_sem;
static smp_comm_pipe requests;
static volatile int thread_alive;
static int configured;
static uae_u8 dmacmemory[100];
static struct cd_toc_head toc;
static uae_u32 last_cd_position, play_start, play_end;
static uae_u8 cdrom_qcode[4 + 12], cd_audio_status;
static int datatrack;
static volatile uae_u8 dmac_istr, dmac_cntr;
static volatile uae_u16 dmac_dawr;
static volatile uae_u32 dmac_acr;
static volatile int dmac_wtc;
static volatile int dmac_dma;
static volatile int activate_stch, cdrom_command_done;
static volatile int cdrom_sector, cdrom_sectors, cdrom_length, cdrom_offset;
static volatile int cd_playing, cd_paused, cd_motor, cd_media, cd_error, cd_finished, cd_isready, cd_audio_finished;
static uae_u32 last_play_pos, last_play_end;
static volatile int cdtv_hsync, dma_finished, cdtv_sectorsize;
static volatile uae_u64 dma_wait;
static int cd_volume, cd_volume_stored;
static int cd_led;
static int frontpanel;
static uae_u8 cdrom_command_input[16];
static int cdrom_command_cnt_in;
static uae_u8 tp_a, tp_b, tp_c, tp_ad, tp_bd, tp_cd;
static uae_u8 tp_imask, tp_cr, tp_air, tp_ilatch, tp_ilatch2;
#ifdef ROMHACK
#define ROM_VECTOR 0x2000
#define ROM_OFFSET 0x2000
static int rom_size, rom_mask;
static uae_u8 *rom;
#endif
static void do_stch (void);
static void INT2 (void)
{
if (!(intreq & 8)) {
INTREQ_0 (0x8000 | 0x0008);
}
cd_led ^= LED_CD_ACTIVE2;
}
static volatile int cdrom_command_cnt_out, cdrom_command_size_out;
static uae_u8 cdrom_command_output[16];
static volatile int stch, sten, scor, sbcp;
static volatile int cmd, enable, xaen, dten;
static int unitnum = -1;
static void subreset (void)
{
uae_sem_wait (&sub_sem);
memset (subcodebufferinuse, 0, sizeof subcodebufferinuse);
subcodebufferoffsetw = subcodebufferoffset = 0;
subcodeoffset = -1;
sbcp = 0;
scor = 0;
uae_sem_post (&sub_sem);
}
static int get_toc (void)
{
datatrack = 0;
if (!sys_command_cd_toc (unitnum, &toc))
return 0;
last_cd_position = toc.lastaddress;
if (toc.first_track == 1 && (toc.toc[toc.first_track_offset].control & 0x0c) == 0x04)
datatrack = 1;
return 1;
}
static int get_qcode (void)
{
if (!sys_command_cd_qcode (unitnum, cdrom_qcode))
return 0;
cdrom_qcode[1] = cd_audio_status;
return 1;
}
static void cdaudiostop_do (void)
{
if (unitnum < 0)
return;
sys_command_cd_pause (unitnum, 0);
sys_command_cd_stop (unitnum);
}
static void cdaudiostop (void)
{
cd_finished = 0;
cd_audio_status = AUDIO_STATUS_NO_STATUS;
if (cd_playing) {
cd_audio_status = AUDIO_STATUS_PLAY_COMPLETE;
cd_finished = 1;
}
cd_playing = 0;
cd_paused = 0;
cd_motor = 0;
cd_audio_finished = 0;
write_comm_pipe_u32 (&requests, 0x0104, 1);
}
static void cdaudiostopfp (void)
{
cdaudiostop_do ();
cd_audio_status = AUDIO_STATUS_NO_STATUS;
activate_stch = 1;
cd_finished = 0;
cd_playing = 0;
cd_paused = 0;
cd_motor = 0;
}
static int pause_audio (int pause)
{
sys_command_cd_pause (unitnum, pause);
if (!cd_playing) {
cd_paused = 0;
cd_audio_status = AUDIO_STATUS_NO_STATUS;
return 0;
}
cd_paused = pause;
cd_audio_status = pause ? AUDIO_STATUS_PAUSED : AUDIO_STATUS_IN_PROGRESS;
subreset ();
return 1;
}
static int read_sectors (int start, int length)
{
if (cd_playing)
cdaudiostop ();
#ifdef CDTV_DEBUG_CMD
write_log (L"READ DATA sector %d, %d sectors (blocksize=%d)\n", start, length, cdtv_sectorsize);
#endif
cdrom_sector = start;
cdrom_sectors = length;
cdrom_offset = start * cdtv_sectorsize;
cdrom_length = length * cdtv_sectorsize;
cd_motor = 1;
cd_audio_status = AUDIO_STATUS_NOT_SUPPORTED;
return 0;
}
static int ismedia (void)
{
if (unitnum < 0)
return 0;
return sys_command_ismedia (unitnum, 0);
}
static int issub (void)
{
return 1;
}
static void subfunc (uae_u8 *data, int cnt)
{
if (!issub ())
return;
uae_sem_wait (&sub_sem);
#ifdef CDTV_SUB_DEBUG
int total = 0;
for (int i = 0; i < MAX_SUBCODEBUFFER; i++) {
if (subcodebufferinuse[i])
total++;
}
write_log (L"%d ", total);
#endif
if (subcodebufferinuse[subcodebufferoffsetw]) {
memset (subcodebufferinuse, 0, sizeof subcodebufferinuse);
subcodebufferoffsetw = subcodebufferoffset = 0;
subcodeoffset = -1;
uae_sem_post (&sub_sem);
#ifdef CDTV_SUB_DEBUG
write_log (L"CDTV: subcode buffer overflow 1\n");
#endif
return;
}
int offset = subcodebufferoffsetw;
while (cnt > 0) {
if (subcodebufferinuse[offset]) {
#ifdef CDTV_SUB_DEBUG
write_log (L"CDTV: subcode buffer overflow 2\n");
#endif
break;
}
subcodebufferinuse[offset] = 1;
memcpy (&subcodebuffer[offset * SUB_CHANNEL_SIZE], data, SUB_CHANNEL_SIZE);
data += SUB_CHANNEL_SIZE;
offset++;
if (offset >= MAX_SUBCODEBUFFER)
offset = 0;
cnt--;
}
subcodebufferoffsetw = offset;
uae_sem_post (&sub_sem);
}
static int statusfunc (int status)
{
if (status == -1)
return 500;
if (status == -2)
return 75;
if (cd_audio_status != status) {
if (status == AUDIO_STATUS_PLAY_COMPLETE || status == AUDIO_STATUS_PLAY_ERROR) {
cd_audio_finished = 1;
} else {
if (status == AUDIO_STATUS_IN_PROGRESS)
cd_playing = 1;
activate_stch = 1;
}
}
cd_audio_status = status;
return 0;
}
static void do_play (void)
{
uae_u32 start = read_comm_pipe_u32_blocking (&requests);
uae_u32 end = read_comm_pipe_u32_blocking (&requests);
uae_u32 scan = read_comm_pipe_u32_blocking (&requests);
subreset ();
sys_command_cd_pause (unitnum, 0);
sys_command_cd_volume (unitnum, (cd_volume_stored << 5) | (cd_volume_stored >> 5), (cd_volume_stored << 5) | (cd_volume_stored >> 5));
sys_command_cd_play (unitnum, start, end, 0, statusfunc, subfunc);
}
static void startplay (void)
{
subreset ();
write_comm_pipe_u32 (&requests, 0x0110, 0);
write_comm_pipe_u32 (&requests, play_start, 0);
write_comm_pipe_u32 (&requests, play_end, 0);
write_comm_pipe_u32 (&requests, 0, 1);
if (!cd_motor) {
cd_motor = 1;
activate_stch = 1;
}
}
static int play_cdtrack (uae_u8 *p)
{
int track_start = p[1];
int index_start = p[2];
int track_end = p[3];
int index_end = p[4];
int start_found, end_found;
uae_u32 start, end;
int j;
if (track_start == 0 && track_end == 0)
return 0;
end = last_cd_position;
start_found = end_found = 0;
for (j = 0; j < toc.points; j++) {
struct cd_toc *s = &toc.toc[j];
if (track_start == s->track) {
start_found++;
start = s->paddress;
}
if (track_end == s->track) {
end = s->paddress;
end_found++;
}
}
if (start_found == 0) {
cdaudiostop ();
cd_error = 1;
activate_stch = 1;
write_log (L"PLAY CD AUDIO: illegal start track %d\n", track_start);
return 0;
}
play_end = end;
play_start = start;
last_play_pos = start;
last_play_end = end;
#ifdef CDTV_DEBUG_CMD
write_log (L"PLAY CD AUDIO from %d-%d, %06X (%d) to %06X (%d)\n",
track_start, track_end, start, start, end, end);
#endif
startplay ();
return 0;
}
static int play_cd (uae_u8 *p)
{
uae_u32 start, end;
start = (p[1] << 16) | (p[2] << 8) | p[3];
end = (p[4] << 16) | (p[5] << 8) | p[6];
if (p[0] == 0x09) /* end is length in lsn-mode */
end += start;
if (start == 0 && end == 0) {
cd_finished = 0;
if (cd_playing)
cd_finished = 1;
cd_playing = 0;
cd_paused = 0;
cd_motor = 0;
write_comm_pipe_u32 (&requests, 0x0104, 1);
cd_audio_status = AUDIO_STATUS_NO_STATUS;
cd_error = 1;
activate_stch = 1;
return 0;
}
if (p[0] != 0x09) { /* msf */
start = msf2lsn (start);
if (end < 0x00ffffff)
end = msf2lsn (end);
}
if (end >= 0x00ffffff || end > last_cd_position)
end = last_cd_position;
play_end = end;
play_start = start;
last_play_pos = start;
last_play_end = end;
#ifdef CDTV_DEBUG_CMD
write_log (L"PLAY CD AUDIO from %06X (%d) to %06X (%d)\n",
lsn2msf (start), start, lsn2msf (end), end);
#endif
startplay ();
return 0;
}
static int cdrom_subq (uae_u8 *out, int msflsn)
{
uae_u8 *s = cdrom_qcode;
uae_u32 trackposlsn, trackposmsf;
uae_u32 diskposlsn, diskposmsf;
out[0] = cd_audio_status;
s += 4;
out[1] = (s[0] >> 4) | (s[0] << 4);
out[2] = frombcd (s[1]); // track
out[3] = frombcd (s[2]); // index
trackposmsf = fromlongbcd (s + 3);
diskposmsf = fromlongbcd (s + 7);
trackposlsn = msf2lsn (trackposmsf);
diskposlsn = msf2lsn (diskposmsf);
out[4] = 0;
out[5] = (msflsn ? diskposmsf : diskposlsn) >> 16;
out[6] = (msflsn ? diskposmsf : diskposlsn) >> 8;
out[7] = (msflsn ? diskposmsf : diskposlsn) >> 0;
out[8] = 0;
out[9] = (msflsn ? trackposmsf : trackposlsn) >> 16;
out[10] = (msflsn ? trackposmsf : trackposlsn) >> 8;
out[11] = (msflsn ? trackposmsf : trackposlsn) >> 0;
out[12] = 0;
if (cd_audio_status == AUDIO_STATUS_IN_PROGRESS)
last_play_pos = diskposlsn;
return 13;
}
static int cdrom_info (uae_u8 *out)
{
uae_u32 size;
if (ismedia () <= 0)
return -1;
cd_motor = 1;
out[0] = toc.first_track;
out[1] = toc.last_track;
size = lsn2msf (toc.lastaddress);
out[2] = size >> 16;
out[3] = size >> 8;
out[4] = size >> 0;
cd_finished = 1;
return 5;
}
static int read_toc (int track, int msflsn, uae_u8 *out)
{
int j;
if (ismedia () <= 0)
return -1;
if (!out)
return 0;
cd_motor = 1;
for (j = 0; j < toc.points; j++) {
if (track == toc.toc[j].point) {
int lsn = toc.toc[j].paddress;
int msf = lsn2msf (lsn);
out[0] = 0;
out[1] = (toc.toc[j].adr << 4) | (toc.toc[j].control << 0);
out[2] = toc.toc[j].point;
out[3] = toc.tracks;
out[4] = 0;
out[5] = (msflsn ? msf : lsn) >> 16;
out[6] = (msflsn ? msf : lsn) >> 8;
out[7] = (msflsn ? msf : lsn) >> 0;
cd_finished = 1;
return 8;
}
}
return -1;
}
static int cdrom_modeset (uae_u8 *cmd)
{
cdtv_sectorsize = (cmd[2] << 8) | cmd[3];
if (cdtv_sectorsize != 2048 && cdtv_sectorsize != 2336 && cdtv_sectorsize != 2352 && cdtv_sectorsize != 2328) {
write_log (L"CDTV: tried to set unknown sector size %d\n", cdtv_sectorsize);
cdtv_sectorsize = 2048;
}
return 0;
}
static void cdrom_command_accepted (int size, uae_u8 *cdrom_command_input, int *cdrom_command_cnt_in)
{
#ifdef CDTV_DEBUG_CMD
TCHAR tmp[200];
int i;
#endif
cdrom_command_size_out = size;
#ifdef CDTV_DEBUG_CMD
tmp[0] = 0;
for (i = 0; i < *cdrom_command_cnt_in; i++)
_stprintf (tmp + i * 3, L"%02X%c", cdrom_command_input[i], i < *cdrom_command_cnt_in - 1 ? '.' : ' ');
write_log (L"CD<-: %s\n", tmp);
if (size > 0) {
tmp[0] = 0;
for (i = 0; i < size; i++)
_stprintf (tmp + i * 3, L"%02X%c", cdrom_command_output[i], i < size - 1 ? '.' : ' ');
write_log (L"CD->: %s\n", tmp);
}
#endif
*cdrom_command_cnt_in = 0;
cdrom_command_cnt_out = 0;
cdrom_command_done = 1;
}
static void cdrom_command_thread (uae_u8 b)
{
uae_u8 *s;
cdrom_command_input[cdrom_command_cnt_in] = b;
cdrom_command_cnt_in++;
s = cdrom_command_input;
switch (cdrom_command_input[0])
{
case 0x01: /* seek */
if (cdrom_command_cnt_in == 7) {
cdrom_command_accepted (0, s, &cdrom_command_cnt_in);
cd_finished = 1;
sleep_millis (500);
activate_stch = 1;
}
break;
case 0x02: /* read */
if (cdrom_command_cnt_in == 7) {
read_sectors ((s[1] << 16) | (s[2] << 8) | (s[3] << 0), (s[4] << 8) | (s[5] << 0));
cdrom_command_accepted (0, s, &cdrom_command_cnt_in);
}
break;
case 0x04: /* motor on */
if (cdrom_command_cnt_in == 7) {
cd_motor = 1;
cdrom_command_accepted (0, s, &cdrom_command_cnt_in);
cd_finished = 1;
}
break;
case 0x05: /* motor off */
if (cdrom_command_cnt_in == 7) {
cd_motor = 0;
cdrom_command_accepted (0, s, &cdrom_command_cnt_in);
cd_finished = 1;
}
break;
case 0x09: /* play (lsn) */
case 0x0a: /* play (msf) */
if (cdrom_command_cnt_in == 7) {
cdrom_command_accepted (play_cd (cdrom_command_input), s, &cdrom_command_cnt_in);
}
break;
case 0x0b:
if (cdrom_command_cnt_in == 7) {
cdrom_command_accepted (play_cdtrack (cdrom_command_input), s, &cdrom_command_cnt_in);
}
break;
case 0x81:
if (cdrom_command_cnt_in == 1) {
uae_u8 flag = 0;
if (!cd_isready)
flag |= 1 << 0; // 01
if (cd_playing)
flag |= 1 << 2; // 04
if (cd_finished)
flag |= 1 << 3; // 08
if (cd_error)
flag |= 1 << 4; // 10
if (cd_motor)
flag |= 1 << 5; // 20
if (cd_media)
flag |= 1 << 6; // 40
cdrom_command_output[0] = flag;
cdrom_command_accepted (1, s, &cdrom_command_cnt_in);
cd_finished = 0;
}
break;
case 0x82:
if (cdrom_command_cnt_in == 7) {
if (cd_error)
cdrom_command_output[2] |= 1 << 4;
cd_error = 0;
cd_isready = 0;
cdrom_command_accepted (6, s, &cdrom_command_cnt_in);
cd_finished = 1;
}
break;
case 0x83:
if (cdrom_command_cnt_in == 7) {
memcpy (cdrom_command_output, MODEL_NAME, strlen (MODEL_NAME));
cdrom_command_accepted (strlen (MODEL_NAME), s, &cdrom_command_cnt_in);
cd_finished = 1;
}
case 0x84:
if (cdrom_command_cnt_in == 7) {
cdrom_command_accepted (cdrom_modeset (cdrom_command_input), s, &cdrom_command_cnt_in);
cd_finished = 1;
}
break;
case 0x87: /* subq */
if (cdrom_command_cnt_in == 7) {
cdrom_command_accepted (cdrom_subq (cdrom_command_output, cdrom_command_input[1] & 2), s, &cdrom_command_cnt_in);
}
break;
case 0x89:
if (cdrom_command_cnt_in == 7) {
cdrom_command_accepted (cdrom_info (cdrom_command_output), s, &cdrom_command_cnt_in);
}
break;
case 0x8a: /* read toc */
if (cdrom_command_cnt_in == 7) {
cdrom_command_accepted (read_toc (cdrom_command_input[2], cdrom_command_input[1] & 2, cdrom_command_output), s, &cdrom_command_cnt_in);
}
break;
case 0x8b:
if (cdrom_command_cnt_in == 7) {
pause_audio (s[1] == 0x00 ? 1 : 0);
cdrom_command_accepted (0, s, &cdrom_command_cnt_in);
cd_finished = 1;
}
break;
case 0xa3: /* front panel */
if (cdrom_command_cnt_in == 7) {
frontpanel = s[1] ? 1 : 0;
cdrom_command_accepted (0, s, &cdrom_command_cnt_in);
cd_finished = 1;
}
break;
default:
write_log (L"unknown CDROM command %02X!\n", s[0]);
cd_error = 1;
cdrom_command_accepted (0, s, &cdrom_command_cnt_in);
break;
}
}
static void dma_do_thread (void)
{
static int readsector;
int didread = 0;
int cnt;
while (dma_finished)
sleep_millis (2);
if (!cdtv_sectorsize)
return;
cnt = dmac_wtc;
#ifdef CDTV_DEBUG_CMD
write_log (L"DMAC DMA: sector=%d, addr=%08X, words=%d (of %d)\n",
cdrom_offset / cdtv_sectorsize, dmac_acr, cnt, cdrom_length / 2);
#endif
dma_wait += cnt * (uae_u64)312 * 50 / 75 + 1;
while (cnt > 0 && dmac_dma) {
uae_u8 buffer[2352];
if (!didread || readsector != (cdrom_offset / cdtv_sectorsize)) {
readsector = cdrom_offset / cdtv_sectorsize;
if (cdtv_sectorsize != 2048)
didread = sys_command_cd_rawread (unitnum, buffer, readsector, 1, cdtv_sectorsize);
else
didread = sys_command_cd_read (unitnum, buffer, readsector, 1);
if (!didread) {
cd_error = 1;
activate_stch = 1;
write_log (L"CDTV: CD read error!\n");
break;
}
}
put_byte (dmac_acr, buffer[(cdrom_offset % cdtv_sectorsize) + 0]);
put_byte (dmac_acr + 1, buffer[(cdrom_offset % cdtv_sectorsize) + 1]);
cnt--;
dmac_acr += 2;
cdrom_length -= 2;
cdrom_offset += 2;
}
dmac_wtc = 0;
dmac_dma = 0;
dma_finished = 1;
cd_finished = 1;
}
static void *dev_thread (void *p)
{
write_log (L"CDTV: CD thread started\n");
thread_alive = 1;
for (;;) {
uae_u32 b = read_comm_pipe_u32_blocking (&requests);
if (b == 0xffff) {
thread_alive = -1;
return NULL;
}
if (unitnum < 0)
continue;
switch (b)
{
case 0x0100:
dma_do_thread ();
break;
case 0x0101:
{
int m = ismedia ();
if (m < 0) {
write_log (L"CDTV: device %d lost\n", unitnum);
activate_stch = 1;
cd_media = 0;
} else if (m != cd_media) {
cd_media = m;
get_toc ();
activate_stch = 1;
if (cd_playing)
cd_error = 1;
}
if (cd_media)
get_qcode ();
}
break;
case 0x0102: // pause
sys_command_cd_pause (unitnum, 1);
break;
case 0x0103: // unpause
sys_command_cd_pause (unitnum, 0);
break;
case 0x0104: // stop
cdaudiostop_do ();
break;
case 0x0105: // pause
pause_audio (1);
break;
case 0x0106: // unpause
pause_audio (0);
break;
case 0x0107: // frontpanel stop
cdaudiostopfp ();
break;
case 0x0110: // do_play!
do_play ();
break;
default:
cdrom_command_thread (b);
break;
}
}
}
static void cdrom_command (uae_u8 b)
{
write_comm_pipe_u32 (&requests, b, 1);
}
static void init_play (int start, int end)
{
play_end = end;
play_start = start;
last_play_pos = start;
last_play_end = end;
#ifdef CDTV_DEBUG_CMD
write_log (L"PLAY CD AUDIO from %06X (%d) to %06X (%d)\n",
lsn2msf (start), start, lsn2msf (end), end);
#endif
startplay ();
}
bool cdtv_front_panel (int button)
{
if (!frontpanel || configured <= 0)
return false;
if (button < 0)
return true;
switch (button)
{
case 0: // stop
if (cd_paused)
write_comm_pipe_u32 (&requests, 0x0106, 1);
write_comm_pipe_u32 (&requests, 0x0107, 1);
break;
case 1: // playpause
if (cd_playing) {
write_comm_pipe_u32 (&requests, cd_paused ? 0x0106 : 0x0105, 1);
} else if (cd_media) {
init_play (0, last_cd_position);
}
break;
case 2: // prev
case 3: // next
if (!cd_playing)
return true;
uae_u8 *sq = cdrom_qcode + 4;
int track = frombcd (sq[1]);
int pos = 0;
for (int j = 0; j < toc.points; j++) {
int t = toc.toc[j].track;
pos = toc.toc[j].paddress;
if (t == 1 && track == 1 && button == 2)
break;
else if (j == toc.points - 1 && t == track && button == 3)
break;
else if (t == track - 1 && track > 1 && button == 2)
break;
else if (t == track + 1 && track < 99 && button == 3)
break;
}
init_play (pos - 150, last_cd_position);
break;
}
return true;
}
static uae_u8 get_tp_c (void)
{
uae_u8 v = (sbcp ? 0 : (1 << 0)) | (scor ? 0 : (1 << 1)) |
(stch ? 0 : (1 << 2)) | (sten ? 0 : (1 << 3) | (1 << 4));
return v;
}
static uae_u8 get_tp_c_level (void)
{
uae_u8 v = (sbcp == 1 ? 0 : (1 << 0)) | (scor == 1 ? 0 : (1 << 1)) |
(stch == 1 ? 0 : (1 << 2)) | (sten == 1 ? 0 : (1 << 3)) | (1 << 4);
if (sten == 1)
sten = -1;
if (scor == 1)
scor = -1;
if (sbcp == 1)
sbcp = -1;
return v;
}
static void tp_check_interrupts (void)
{
/* MC = 1 ? */
if ((tp_cr & 1) != 1) {
get_tp_c_level ();
return;
}
tp_ilatch |= get_tp_c_level () ^ 0x1f;
stch = 0;
if (!(tp_ilatch & (1 << 5)) && (tp_ilatch & tp_imask)) {
tp_air = 0;
int mask = 0x10;
while (((tp_ilatch & tp_imask) & mask) == 0)
mask >>= 1;
tp_air |= tp_ilatch & mask;
tp_ilatch |= 1 << 5; // IRQ
tp_ilatch2 = tp_ilatch & mask;
tp_ilatch &= ~mask;
}
if (tp_ilatch & (1 << 5))
INT2 ();
}
// MC=1, C lines 0-4 = input irq lines, 5 = irq out, 6-7 IO
static void tp_bput (int addr, uae_u8 v)
{
static int volstrobe1, volstrobe2;
#ifdef CDTV_DEBUG_6525
if (addr != 1)
write_log (L"6525 write %x=%02X PC=%x %d\n", addr, v, M68K_GETPC, regs.s);
#endif
switch (addr)
{
case 0:
tp_a = v;
break;
case 1:
tp_b = v;
break;
case 2:
if (tp_cr & 1) {
// 0 = clear, 1 = ignored
tp_ilatch &= 0xe0 | v;
} else {
tp_c = get_tp_c () & ~tp_cd;
tp_c |= v & tp_cd;
if (tp_c & (1 << 5))
INT2 ();
}
break;
case 3:
tp_ad = v;
break;
case 4:
tp_bd = v;
break;
case 5:
// data direction (mode=0), interrupt mask (mode=1)
if (tp_cr & 1) {
tp_imask = v & 0x1f;
} else {
tp_cd = v;
}
break;
case 6:
tp_cr = v;
break;
case 7:
tp_air = v;
break;
}
cmd = (tp_b >> 0) & 1;
enable = (tp_b >> 1) & 1;
xaen = (tp_b >> 2) & 1;
dten = (tp_b >> 3) & 1;
if (!volstrobe1 && ((tp_b >> 6) & 1)) {
cd_volume >>= 1;
cd_volume |= ((tp_b >> 5) & 1) << 11;
volstrobe1 = 1;
} else if (volstrobe1 && !((tp_b >> 6) & 1)) {
volstrobe1 = 0;
}
if (!volstrobe2 && ((tp_b >> 7) & 1)) {
#ifdef CDTV_DEBUG_CMD
write_log (L"CDTV CD volume = %d\n", cd_volume);
#endif
if (cd_volume > 1023)
cd_volume = 1023;
if (unitnum >= 0)
sys_command_cd_volume (unitnum, (cd_volume << 5) | (cd_volume >> 5), (cd_volume << 5) | (cd_volume >> 5));
cd_volume_stored = cd_volume;
cd_volume = 0;
volstrobe2 = 1;
} else if (volstrobe2 && !((tp_b >> 7) & 1)) {
volstrobe2 = 0;
}
tp_check_interrupts ();
}
static uae_u8 subtransferbuf[SUB_CHANNEL_SIZE];
#define SUBCODE_CYCLES (2 * maxhpos)
static int subcode_activecnt;
static void subcode_interrupt (uae_u32 v)
{
subcode_activecnt--;
if (subcode_activecnt > 0) {
if (subcode_activecnt > 1)
subcode_activecnt = 1;
return;
}
if (subcodeoffset < -1)
return;
if (sbcp && scor == 0) {
sbcp = 0;
// CD+G interrupt didn't read data fast enough, just abort until next packet
return;
}
if (scor < 0) {
scor = 0;
if (issub ()) {
subcodeoffset = 0;
}
tp_check_interrupts ();
}
if (subcodeoffset >= SUB_CHANNEL_SIZE)
return;
sbcp = 1;
tp_check_interrupts ();
subcode_activecnt++;
event2_newevent2 (SUBCODE_CYCLES, 0, subcode_interrupt);
}
static uae_u8 tp_bget (int addr)
{
uae_u8 v = 0;
switch (addr)
{
case 0:
// A = subchannel byte input from serial to parallel converter
if (subcodeoffset < 0 || subcodeoffset >= SUB_CHANNEL_SIZE) {
#ifdef CDTV_SUB_DEBUG
write_log (L"CDTV: requested non-existing subchannel data!? %d\n", subcodeoffset);
#endif
v = 0;
} else {
v = subtransferbuf[subcodeoffset];
tp_a = 0;
tp_a |= (v >> 7) & 1;
tp_a |= (v >> 5) & 2;
tp_a |= (v >> 3) & 4;
tp_a |= (v >> 1) & 8;
tp_a |= (v << 1) & 16;
tp_a |= (v << 3) & 32;
tp_a |= (v << 5) & 64;
tp_a |= (v << 7) & 128;
v = tp_a;
subcodeoffset++;
sbcp = 0;
if (subcodeoffset >= SUB_CHANNEL_SIZE)
subcodeoffset = -2;
}
break;
case 1:
v = tp_b;
break;
case 2:
if (tp_cr & 1) {