hw/sb16.c

   1 /*
   2  * QEMU Soundblaster 16 emulation
   3  *
   4  * Copyright (c) 2003-2005 Vassili Karpov (malc)
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "audiodev.h"
  26 #include "audio/audio.h"
  27 #include "isa.h"
  28 #include "qemu-timer.h"
  29
  30 #define LENOFA(a) ((int) (sizeof(a)/sizeof(a[0])))
  31
  32 #define dolog(...) AUD_log ("sb16", __VA_ARGS__)
  33
  34 /* #define DEBUG */
  35 /* #define DEBUG_SB16_MOST */
  36
  37 #ifdef DEBUG
  38 #define ldebug(...) dolog (__VA_ARGS__)
  39 #else
  40 #define ldebug(...)
  41 #endif
  42
  43 #define IO_READ_PROTO(name)                             \
  44     uint32_t name (void *opaque, uint32_t nport)
  45 #define IO_WRITE_PROTO(name)                                    \
  46     void name (void *opaque, uint32_t nport, uint32_t val)
  47
  48 static const char e3[] = "COPYRIGHT (C) CREATIVE TECHNOLOGY LTD, 1992.";
  49
  50 static struct {
  51     int ver_lo;
  52     int ver_hi;
  53     int irq;
  54     int dma;
  55     int hdma;
  56     int port;
  57 } conf = {5, 4, 5, 1, 5, 0x220};
  58
  59 typedef struct SB16State {
  60     QEMUSoundCard card;
  61     qemu_irq *pic;
  62     int irq;
  63     int dma;
  64     int hdma;
  65     int port;
  66     int ver;
  67
  68     int in_index;
  69     int out_data_len;
  70     int fmt_stereo;
  71     int fmt_signed;
  72     int fmt_bits;
  73     audfmt_e fmt;
  74     int dma_auto;
  75     int block_size;
  76     int fifo;
  77     int freq;
  78     int time_const;
  79     int speaker;
  80     int needed_bytes;
  81     int cmd;
  82     int use_hdma;
  83     int highspeed;
  84     int can_write;
  85
  86     int v2x6;
  87
  88     uint8_t csp_param;
  89     uint8_t csp_value;
  90     uint8_t csp_mode;
  91     uint8_t csp_regs[256];
  92     uint8_t csp_index;
  93     uint8_t csp_reg83[4];
  94     int csp_reg83r;
  95     int csp_reg83w;
  96
  97     uint8_t in2_data[10];
  98     uint8_t out_data[50];
  99     uint8_t test_reg;
 100     uint8_t last_read_byte;
 101     int nzero;
 102
 103     int left_till_irq;
 104
 105     int dma_running;
 106     int bytes_per_second;
 107     int align;
 108     int audio_free;
 109     SWVoiceOut *voice;
 110
 111     QEMUTimer *aux_ts;
 112     /* mixer state */
 113     int mixer_nreg;
 114     uint8_t mixer_regs[256];
 115 } SB16State;
 116
 117 static void SB_audio_callback (void *opaque, int free);
 118
 119 static int magic_of_irq (int irq)
 120 {
 121     switch (irq) {
 122     case 5:
 123         return 2;
 124     case 7:
 125         return 4;
 126     case 9:
 127         return 1;
 128     case 10:
 129         return 8;
 130     default:
 131         dolog ("bad irq %d\n", irq);
 132         return 2;
 133     }
 134 }
 135
 136 static int irq_of_magic (int magic)
 137 {
 138     switch (magic) {
 139     case 1:
 140         return 9;
 141     case 2:
 142         return 5;
 143     case 4:
 144         return 7;
 145     case 8:
 146         return 10;
 147     default:
 148         dolog ("bad irq magic %d\n", magic);
 149         return -1;
 150     }
 151 }
 152
 153 #if 0
 154 static void log_dsp (SB16State *dsp)
 155 {
 156     ldebug ("%s:%s:%d:%s:dmasize=%d:freq=%d:const=%d:speaker=%d\n",
 157             dsp->fmt_stereo ? "Stereo" : "Mono",
 158             dsp->fmt_signed ? "Signed" : "Unsigned",
 159             dsp->fmt_bits,
 160             dsp->dma_auto ? "Auto" : "Single",
 161             dsp->block_size,
 162             dsp->freq,
 163             dsp->time_const,
 164             dsp->speaker);
 165 }
 166 #endif
 167
 168 static void speaker (SB16State *s, int on)
 169 {
 170     s->speaker = on;
 171     /* AUD_enable (s->voice, on); */
 172 }
 173
 174 static void control (SB16State *s, int hold)
 175 {
 176     int dma = s->use_hdma ? s->hdma : s->dma;
 177     s->dma_running = hold;
 178
 179     ldebug ("hold %d high %d dma %d\n", hold, s->use_hdma, dma);
 180
 181     if (hold) {
 182         DMA_hold_DREQ (dma);
 183         AUD_set_active_out (s->voice, 1);
 184     }
 185     else {
 186         DMA_release_DREQ (dma);
 187         AUD_set_active_out (s->voice, 0);
 188     }
 189 }
 190
 191 static void aux_timer (void *opaque)
 192 {
 193     SB16State *s = opaque;
 194     s->can_write = 1;
 195     qemu_irq_raise (s->pic[s->irq]);
 196 }
 197
 198 #define DMA8_AUTO 1
 199 #define DMA8_HIGH 2
 200
 201 static void continue_dma8 (SB16State *s)
 202 {
 203     if (s->freq > 0) {
 204         struct audsettings as;
 205
 206         s->audio_free = 0;
 207
 208         as.freq = s->freq;
 209         as.nchannels = 1 << s->fmt_stereo;
 210         as.fmt = s->fmt;
 211         as.endianness = 0;
 212
 213         s->voice = AUD_open_out (
 214             &s->card,
 215             s->voice,
 216             "sb16",
 217             s,
 218             SB_audio_callback,
 219             &as
 220             );
 221     }
 222
 223     control (s, 1);
 224 }
 225
 226 static void dma_cmd8 (SB16State *s, int mask, int dma_len)
 227 {
 228     s->fmt = AUD_FMT_U8;
 229     s->use_hdma = 0;
 230     s->fmt_bits = 8;
 231     s->fmt_signed = 0;
 232     s->fmt_stereo = (s->mixer_regs[0x0e] & 2) != 0;
 233     if (-1 == s->time_const) {
 234         if (s->freq <= 0)
 235             s->freq = 11025;
 236     }
 237     else {
 238         int tmp = (256 - s->time_const);
 239         s->freq = (1000000 + (tmp / 2)) / tmp;
 240     }
 241
 242     if (dma_len != -1) {
 243         s->block_size = dma_len << s->fmt_stereo;
 244     }
 245     else {
 246         /* This is apparently the only way to make both Act1/PL
 247            and SecondReality/FC work
 248
 249            Act1 sets block size via command 0x48 and it's an odd number
 250            SR does the same with even number
 251            Both use stereo, and Creatives own documentation states that
 252            0x48 sets block size in bytes less one.. go figure */
 253         s->block_size &= ~s->fmt_stereo;
 254     }
 255
 256     s->freq >>= s->fmt_stereo;
 257     s->left_till_irq = s->block_size;
 258     s->bytes_per_second = (s->freq << s->fmt_stereo);
 259     /* s->highspeed = (mask & DMA8_HIGH) != 0; */
 260     s->dma_auto = (mask & DMA8_AUTO) != 0;
 261     s->align = (1 << s->fmt_stereo) - 1;
 262
 263     if (s->block_size & s->align) {
 264         dolog ("warning: misaligned block size %d, alignment %d\n",
 265                s->block_size, s->align + 1);
 266     }
 267
 268     ldebug ("freq %d, stereo %d, sign %d, bits %d, "
 269             "dma %d, auto %d, fifo %d, high %d\n",
 270             s->freq, s->fmt_stereo, s->fmt_signed, s->fmt_bits,
 271             s->block_size, s->dma_auto, s->fifo, s->highspeed);
 272
 273     continue_dma8 (s);
 274     speaker (s, 1);
 275 }
 276
 277 static void dma_cmd (SB16State *s, uint8_t cmd, uint8_t d0, int dma_len)
 278 {
 279     s->use_hdma = cmd < 0xc0;
 280     s->fifo = (cmd >> 1) & 1;
 281     s->dma_auto = (cmd >> 2) & 1;
 282     s->fmt_signed = (d0 >> 4) & 1;
 283     s->fmt_stereo = (d0 >> 5) & 1;
 284
 285     switch (cmd >> 4) {
 286     case 11:
 287         s->fmt_bits = 16;
 288         break;
 289
 290     case 12:
 291         s->fmt_bits = 8;
 292         break;
 293     }
 294
 295     if (-1 != s->time_const) {
 296 #if 1
 297         int tmp = 256 - s->time_const;
 298         s->freq = (1000000 + (tmp / 2)) / tmp;
 299 #else
 300         /* s->freq = 1000000 / ((255 - s->time_const) << s->fmt_stereo); */
 301         s->freq = 1000000 / ((255 - s->time_const));
 302 #endif
 303         s->time_const = -1;
 304     }
 305
 306     s->block_size = dma_len + 1;
 307     s->block_size <<= (s->fmt_bits == 16);
 308     if (!s->dma_auto) {
 309         /* It is clear that for DOOM and auto-init this value
 310            shouldn't take stereo into account, while Miles Sound Systems
 311            setsound.exe with single transfer mode wouldn't work without it
 312            wonders of SB16 yet again */
 313         s->block_size <<= s->fmt_stereo;
 314     }
 315
 316     ldebug ("freq %d, stereo %d, sign %d, bits %d, "
 317             "dma %d, auto %d, fifo %d, high %d\n",
 318             s->freq, s->fmt_stereo, s->fmt_signed, s->fmt_bits,
 319             s->block_size, s->dma_auto, s->fifo, s->highspeed);
 320
 321     if (16 == s->fmt_bits) {
 322         if (s->fmt_signed) {
 323             s->fmt = AUD_FMT_S16;
 324         }
 325         else {
 326             s->fmt = AUD_FMT_U16;
 327         }
 328     }
 329     else {
 330         if (s->fmt_signed) {
 331             s->fmt = AUD_FMT_S8;
 332         }
 333         else {
 334             s->fmt = AUD_FMT_U8;
 335         }
 336     }
 337
 338     s->left_till_irq = s->block_size;
 339
 340     s->bytes_per_second = (s->freq << s->fmt_stereo) << (s->fmt_bits == 16);
 341     s->highspeed = 0;
 342     s->align = (1 << (s->fmt_stereo + (s->fmt_bits == 16))) - 1;
 343     if (s->block_size & s->align) {
 344         dolog ("warning: misaligned block size %d, alignment %d\n",
 345                s->block_size, s->align + 1);
 346     }
 347
 348     if (s->freq) {
 349         struct audsettings as;
 350
 351         s->audio_free = 0;
 352
 353         as.freq = s->freq;
 354         as.nchannels = 1 << s->fmt_stereo;
 355         as.fmt = s->fmt;
 356         as.endianness = 0;
 357
 358         s->voice = AUD_open_out (
 359             &s->card,
 360             s->voice,
 361             "sb16",
 362             s,
 363             SB_audio_callback,
 364             &as
 365             );
 366     }
 367
 368     control (s, 1);
 369     speaker (s, 1);
 370 }
 371
 372 static inline void dsp_out_data (SB16State *s, uint8_t val)
 373 {
 374     ldebug ("outdata %#x\n", val);
 375     if ((size_t) s->out_data_len < sizeof (s->out_data)) {
 376         s->out_data[s->out_data_len++] = val;
 377     }
 378 }
 379
 380 static inline uint8_t dsp_get_data (SB16State *s)
 381 {
 382     if (s->in_index) {
 383         return s->in2_data[--s->in_index];
 384     }
 385     else {
 386         dolog ("buffer underflow\n");
 387         return 0;
 388     }
 389 }
 390
 391 static void command (SB16State *s, uint8_t cmd)
 392 {
 393     ldebug ("command %#x\n", cmd);
 394
 395     if (cmd > 0xaf && cmd < 0xd0) {
 396         if (cmd & 8) {
 397             dolog ("ADC not yet supported (command %#x)\n", cmd);
 398         }
 399
 400         switch (cmd >> 4) {
 401         case 11:
 402         case 12:
 403             break;
 404         default:
 405             dolog ("%#x wrong bits\n", cmd);
 406         }
 407         s->needed_bytes = 3;
 408     }
 409     else {
 410         s->needed_bytes = 0;
 411
 412         switch (cmd) {
 413         case 0x03:
 414             dsp_out_data (s, 0x10); /* s->csp_param); */
 415             goto warn;
 416
 417         case 0x04:
 418             s->needed_bytes = 1;
 419             goto warn;
 420
 421         case 0x05:
 422             s->needed_bytes = 2;
 423             goto warn;
 424
 425         case 0x08:
 426             /* __asm__ ("int3"); */
 427             goto warn;
 428
 429         case 0x0e:
 430             s->needed_bytes = 2;
 431             goto warn;
 432
 433         case 0x09:
 434             dsp_out_data (s, 0xf8);
 435             goto warn;
 436
 437         case 0x0f:
 438             s->needed_bytes = 1;
 439             goto warn;
 440
 441         case 0x10:
 442             s->needed_bytes = 1;
 443             goto warn;
 444
 445         case 0x14:
 446             s->needed_bytes = 2;
 447             s->block_size = 0;
 448             break;
 449
 450         case 0x1c:              /* Auto-Initialize DMA DAC, 8-bit */
 451             dma_cmd8 (s, DMA8_AUTO, -1);
 452             break;
 453
 454         case 0x20:              /* Direct ADC, Juice/PL */
 455             dsp_out_data (s, 0xff);
 456             goto warn;
 457
 458         case 0x35:
 459             dolog ("0x35 - MIDI command not implemented\n");
 460             break;
 461
 462         case 0x40:
 463             s->freq = -1;
 464             s->time_const = -1;
 465             s->needed_bytes = 1;
 466             break;
 467
 468         case 0x41:
 469             s->freq = -1;
 470             s->time_const = -1;
 471             s->needed_bytes = 2;
 472             break;
 473
 474         case 0x42:
 475             s->freq = -1;
 476             s->time_const = -1;
 477             s->needed_bytes = 2;
 478             goto warn;
 479
 480         case 0x45:
 481             dsp_out_data (s, 0xaa);
 482             goto warn;
 483
 484         case 0x47:                /* Continue Auto-Initialize DMA 16bit */
 485             break;
 486
 487         case 0x48:
 488             s->needed_bytes = 2;
 489             break;
 490
 491         case 0x74:
 492             s->needed_bytes = 2; /* DMA DAC, 4-bit ADPCM */
 493             dolog ("0x75 - DMA DAC, 4-bit ADPCM not implemented\n");
 494             break;
 495
 496         case 0x75:              /* DMA DAC, 4-bit ADPCM Reference */
 497             s->needed_bytes = 2;
 498             dolog ("0x74 - DMA DAC, 4-bit ADPCM Reference not implemented\n");
 499             break;
 500
 501         case 0x76:              /* DMA DAC, 2.6-bit ADPCM */
 502             s->needed_bytes = 2;
 503             dolog ("0x74 - DMA DAC, 2.6-bit ADPCM not implemented\n");
 504             break;
 505
 506         case 0x77:              /* DMA DAC, 2.6-bit ADPCM Reference */
 507             s->needed_bytes = 2;
 508             dolog ("0x74 - DMA DAC, 2.6-bit ADPCM Reference not implemented\n");
 509             break;
 510
 511         case 0x7d:
 512             dolog ("0x7d - Autio-Initialize DMA DAC, 4-bit ADPCM Reference\n");
 513             dolog ("not implemented\n");
 514             break;
 515
 516         case 0x7f:
 517             dolog (
 518                 "0x7d - Autio-Initialize DMA DAC, 2.6-bit ADPCM Reference\n"
 519                 );
 520             dolog ("not implemented\n");
 521             break;
 522
 523         case 0x80:
 524             s->needed_bytes = 2;
 525             break;
 526
 527         case 0x90:
 528         case 0x91:
 529             dma_cmd8 (s, ((cmd & 1) == 0) | DMA8_HIGH, -1);
 530             break;
 531
 532         case 0xd0:              /* halt DMA operation. 8bit */
 533             control (s, 0);
 534             break;
 535
 536         case 0xd1:              /* speaker on */
 537             speaker (s, 1);
 538             break;
 539
 540         case 0xd3:              /* speaker off */
 541             speaker (s, 0);
 542             break;
 543
 544         case 0xd4:              /* continue DMA operation. 8bit */
 545             /* KQ6 (or maybe Sierras audblst.drv in general) resets
 546                the frequency between halt/continue */
 547             continue_dma8 (s);
 548             break;
 549
 550         case 0xd5:              /* halt DMA operation. 16bit */
 551             control (s, 0);
 552             break;
 553
 554         case 0xd6:              /* continue DMA operation. 16bit */
 555             control (s, 1);
 556             break;
 557
 558         case 0xd9:              /* exit auto-init DMA after this block. 16bit */
 559             s->dma_auto = 0;
 560             break;
 561
 562         case 0xda:              /* exit auto-init DMA after this block. 8bit */
 563             s->dma_auto = 0;
 564             break;
 565
 566         case 0xe0:              /* DSP identification */
 567             s->needed_bytes = 1;
 568             break;
 569
 570         case 0xe1:
 571             dsp_out_data (s, s->ver & 0xff);
 572             dsp_out_data (s, s->ver >> 8);
 573             break;
 574
 575         case 0xe2:
 576             s->needed_bytes = 1;
 577             goto warn;
 578
 579         case 0xe3:
 580             {
 581                 int i;
 582                 for (i = sizeof (e3) - 1; i >= 0; --i)
 583                     dsp_out_data (s, e3[i]);
 584             }
 585             break;
 586
 587         case 0xe4:              /* write test reg */
 588             s->needed_bytes = 1;
 589             break;
 590
 591         case 0xe7:
 592             dolog ("Attempt to probe for ESS (0xe7)?\n");
 593             break;
 594
 595         case 0xe8:              /* read test reg */
 596             dsp_out_data (s, s->test_reg);
 597             break;
 598
 599         case 0xf2:
 600         case 0xf3:
 601             dsp_out_data (s, 0xaa);
 602             s->mixer_regs[0x82] |= (cmd == 0xf2) ? 1 : 2;
 603             qemu_irq_raise (s->pic[s->irq]);
 604             break;
 605
 606         case 0xf9:
 607             s->needed_bytes = 1;
 608             goto warn;
 609
 610         case 0xfa:
 611             dsp_out_data (s, 0);
 612             goto warn;
 613
 614         case 0xfc:              /* FIXME */
 615             dsp_out_data (s, 0);
 616             goto warn;
 617
 618         default:
 619             dolog ("Unrecognized command %#x\n", cmd);
 620             break;
 621         }
 622     }
 623
 624     if (!s->needed_bytes) {
 625         ldebug ("\n");
 626     }
 627
 628  exit:
 629     if (!s->needed_bytes) {
 630         s->cmd = -1;
 631     }
 632     else {
 633         s->cmd = cmd;
 634     }
 635     return;
 636
 637  warn:
 638     dolog ("warning: command %#x,%d is not truly understood yet\n",
 639            cmd, s->needed_bytes);
 640     goto exit;
 641
 642 }
 643
 644 static uint16_t dsp_get_lohi (SB16State *s)
 645 {
 646     uint8_t hi = dsp_get_data (s);
 647     uint8_t lo = dsp_get_data (s);
 648     return (hi << 8) | lo;
 649 }
 650
 651 static uint16_t dsp_get_hilo (SB16State *s)
 652 {
 653     uint8_t lo = dsp_get_data (s);
 654     uint8_t hi = dsp_get_data (s);
 655     return (hi << 8) | lo;
 656 }
 657
 658 static void complete (SB16State *s)
 659 {
 660     int d0, d1, d2;
 661     ldebug ("complete command %#x, in_index %d, needed_bytes %d\n",
 662             s->cmd, s->in_index, s->needed_bytes);
 663
 664     if (s->cmd > 0xaf && s->cmd < 0xd0) {
 665         d2 = dsp_get_data (s);
 666         d1 = dsp_get_data (s);
 667         d0 = dsp_get_data (s);
 668
 669         if (s->cmd & 8) {
 670             dolog ("ADC params cmd = %#x d0 = %d, d1 = %d, d2 = %d\n",
 671                    s->cmd, d0, d1, d2);
 672         }
 673         else {
 674             ldebug ("cmd = %#x d0 = %d, d1 = %d, d2 = %d\n",
 675                     s->cmd, d0, d1, d2);
 676             dma_cmd (s, s->cmd, d0, d1 + (d2 << 8));
 677         }
 678     }
 679     else {
 680         switch (s->cmd) {
 681         case 0x04:
 682             s->csp_mode = dsp_get_data (s);
 683             s->csp_reg83r = 0;
 684             s->csp_reg83w = 0;
 685             ldebug ("CSP command 0x04: mode=%#x\n", s->csp_mode);
 686             break;
 687
 688         case 0x05:
 689             s->csp_param = dsp_get_data (s);
 690             s->csp_value = dsp_get_data (s);
 691             ldebug ("CSP command 0x05: param=%#x value=%#x\n",
 692                     s->csp_param,
 693                     s->csp_value);
 694             break;
 695
 696         case 0x0e:
 697             d0 = dsp_get_data (s);
 698             d1 = dsp_get_data (s);
 699             ldebug ("write CSP register %d <- %#x\n", d1, d0);
 700             if (d1 == 0x83) {
 701                 ldebug ("0x83[%d] <- %#x\n", s->csp_reg83r, d0);
 702                 s->csp_reg83[s->csp_reg83r % 4] = d0;
 703                 s->csp_reg83r += 1;
 704             }
 705             else {
 706                 s->csp_regs[d1] = d0;
 707             }
 708             break;
 709
 710         case 0x0f:
 711             d0 = dsp_get_data (s);
 712             ldebug ("read CSP register %#x -> %#x, mode=%#x\n",
 713                     d0, s->csp_regs[d0], s->csp_mode);
 714             if (d0 == 0x83) {
 715                 ldebug ("0x83[%d] -> %#x\n",
 716                         s->csp_reg83w,
 717                         s->csp_reg83[s->csp_reg83w % 4]);
 718                 dsp_out_data (s, s->csp_reg83[s->csp_reg83w % 4]);
 719                 s->csp_reg83w += 1;
 720             }
 721             else {
 722                 dsp_out_data (s, s->csp_regs[d0]);
 723             }
 724             break;
 725
 726         case 0x10:
 727             d0 = dsp_get_data (s);
 728             dolog ("cmd 0x10 d0=%#x\n", d0);
 729             break;
 730
 731         case 0x14:
 732             dma_cmd8 (s, 0, dsp_get_lohi (s) + 1);
 733             break;
 734
 735         case 0x40:
 736             s->time_const = dsp_get_data (s);
 737             ldebug ("set time const %d\n", s->time_const);
 738             break;
 739
 740         case 0x42:              /* FT2 sets output freq with this, go figure */
 741 #if 0
 742             dolog ("cmd 0x42 might not do what it think it should\n");
 743 #endif
 744         case 0x41:
 745             s->freq = dsp_get_hilo (s);
 746             ldebug ("set freq %d\n", s->freq);
 747             break;
 748
 749         case 0x48:
 750             s->block_size = dsp_get_lohi (s) + 1;
 751             ldebug ("set dma block len %d\n", s->block_size);
 752             break;
 753
 754         case 0x74:
 755         case 0x75:
 756         case 0x76:
 757         case 0x77:
 758             /* ADPCM stuff, ignore */
 759             break;
 760
 761         case 0x80:
 762             {
 763                 int freq, samples, bytes;
 764                 int64_t ticks;
 765
 766                 freq = s->freq > 0 ? s->freq : 11025;
 767                 samples = dsp_get_lohi (s) + 1;
 768                 bytes = samples << s->fmt_stereo << (s->fmt_bits == 16);
 769                 ticks = (bytes * ticks_per_sec) / freq;
 770                 if (ticks < ticks_per_sec / 1024) {
 771                     qemu_irq_raise (s->pic[s->irq]);
 772                 }
 773                 else {
 774                     if (s->aux_ts) {
 775                         qemu_mod_timer (
 776                             s->aux_ts,
 777                             qemu_get_clock (vm_clock) + ticks
 778                             );
 779                     }
 780                 }
 781                 ldebug ("mix silence %d %d %" PRId64 "\n", samples, bytes, ticks);
 782             }
 783             break;
 784
 785         case 0xe0:
 786             d0 = dsp_get_data (s);
 787             s->out_data_len = 0;
 788             ldebug ("E0 data = %#x\n", d0);
 789             dsp_out_data (s, ~d0);
 790             break;
 791
 792         case 0xe2:
 793             d0 = dsp_get_data (s);
 794             ldebug ("E2 = %#x\n", d0);
 795             break;
 796
 797         case 0xe4:
 798             s->test_reg = dsp_get_data (s);
 799             break;
 800
 801         case 0xf9:
 802             d0 = dsp_get_data (s);
 803             ldebug ("command 0xf9 with %#x\n", d0);
 804             switch (d0) {
 805             case 0x0e:
 806                 dsp_out_data (s, 0xff);
 807                 break;
 808
 809             case 0x0f:
 810                 dsp_out_data (s, 0x07);
 811                 break;
 812
 813             case 0x37:
 814                 dsp_out_data (s, 0x38);
 815                 break;
 816
 817             default:
 818                 dsp_out_data (s, 0x00);
 819                 break;
 820             }
 821             break;
 822
 823         default:
 824             dolog ("complete: unrecognized command %#x\n", s->cmd);
 825             return;
 826         }
 827     }
 828
 829     ldebug ("\n");
 830     s->cmd = -1;
 831     return;
 832 }
 833
 834 static void legacy_reset (SB16State *s)
 835 {
 836     struct audsettings as;
 837
 838     s->freq = 11025;
 839     s->fmt_signed = 0;
 840     s->fmt_bits = 8;
 841     s->fmt_stereo = 0;
 842
 843     as.freq = s->freq;
 844     as.nchannels = 1;
 845     as.fmt = AUD_FMT_U8;
 846     as.endianness = 0;
 847
 848     s->voice = AUD_open_out (
 849         &s->card,
 850         s->voice,
 851         "sb16",
 852         s,
 853         SB_audio_callback,
 854         &as
 855         );
 856
 857     /* Not sure about that... */
 858     /* AUD_set_active_out (s->voice, 1); */
 859 }
 860
 861 static void reset (SB16State *s)
 862 {
 863     qemu_irq_lower (s->pic[s->irq]);
 864     if (s->dma_auto) {
 865         qemu_irq_raise (s->pic[s->irq]);
 866         qemu_irq_lower (s->pic[s->irq]);
 867     }
 868
 869     s->mixer_regs[0x82] = 0;
 870     s->dma_auto = 0;
 871     s->in_index = 0;
 872     s->out_data_len = 0;
 873     s->left_till_irq = 0;
 874     s->needed_bytes = 0;
 875     s->block_size = -1;
 876     s->nzero = 0;
 877     s->highspeed = 0;
 878     s->v2x6 = 0;
 879     s->cmd = -1;
 880
 881     dsp_out_data(s, 0xaa);
 882     speaker (s, 0);
 883     control (s, 0);
 884     legacy_reset (s);
 885 }
 886
 887 static IO_WRITE_PROTO (dsp_write)
 888 {
 889     SB16State *s = opaque;
 890     int iport;
 891
 892     iport = nport - s->port;
 893
 894     ldebug ("write %#x <- %#x\n", nport, val);
 895     switch (iport) {
 896     case 0x06:
 897         switch (val) {
 898         case 0x00:
 899             if (s->v2x6 == 1) {
 900                 if (0 && s->highspeed) {
 901                     s->highspeed = 0;
 902                     qemu_irq_lower (s->pic[s->irq]);
 903                     control (s, 0);
 904                 }
 905                 else {
 906                     reset (s);
 907                 }
 908             }
 909             s->v2x6 = 0;
 910             break;
 911
 912         case 0x01:
 913         case 0x03:              /* FreeBSD kludge */
 914             s->v2x6 = 1;
 915             break;
 916
 917         case 0xc6:
 918             s->v2x6 = 0;        /* Prince of Persia, csp.sys, diagnose.exe */
 919             break;
 920
 921         case 0xb8:              /* Panic */
 922             reset (s);
 923             break;
 924
 925         case 0x39:
 926             dsp_out_data (s, 0x38);
 927             reset (s);
 928             s->v2x6 = 0x39;
 929             break;
 930
 931         default:
 932             s->v2x6 = val;
 933             break;
 934         }
 935         break;
 936
 937     case 0x0c:                  /* write data or command | write status */
 938 /*         if (s->highspeed) */
 939 /*             break; */
 940
 941         if (0 == s->needed_bytes) {
 942             command (s, val);
 943 #if 0
 944             if (0 == s->needed_bytes) {
 945                 log_dsp (s);
 946             }
 947 #endif
 948         }
 949         else {
 950             if (s->in_index == sizeof (s->in2_data)) {
 951                 dolog ("in data overrun\n");
 952             }
 953             else {
 954                 s->in2_data[s->in_index++] = val;
 955                 if (s->in_index == s->needed_bytes) {
 956                     s->needed_bytes = 0;
 957                     complete (s);
 958 #if 0
 959                     log_dsp (s);
 960 #endif
 961                 }
 962             }
 963         }
 964         break;
 965
 966     default:
 967         ldebug ("(nport=%#x, val=%#x)\n", nport, val);
 968         break;
 969     }
 970 }
 971
 972 static IO_READ_PROTO (dsp_read)
 973 {
 974     SB16State *s = opaque;
 975     int iport, retval, ack = 0;
 976
 977     iport = nport - s->port;
 978
 979     switch (iport) {
 980     case 0x06:                  /* reset */
 981         retval = 0xff;
 982         break;
 983
 984     case 0x0a:                  /* read data */
 985         if (s->out_data_len) {
 986             retval = s->out_data[--s->out_data_len];
 987             s->last_read_byte = retval;
 988         }
 989         else {
 990             if (s->cmd != -1) {
 991                 dolog ("empty output buffer for command %#x\n",
 992                        s->cmd);
 993             }
 994             retval = s->last_read_byte;
 995             /* goto error; */
 996         }
 997         break;
 998
 999     case 0x0c:                  /* 0 can write */
1000         retval = s->can_write ? 0 : 0x80;
1001         break;
1002
1003     case 0x0d:                  /* timer interrupt clear */
1004         /* dolog ("timer interrupt clear\n"); */
1005         retval = 0;
1006         break;
1007
1008     case 0x0e:                  /* data available status | irq 8 ack */
1009         retval = (!s->out_data_len || s->highspeed) ? 0 : 0x80;
1010         if (s->mixer_regs[0x82] & 1) {
1011             ack = 1;
1012             s->mixer_regs[0x82] &= 1;
1013             qemu_irq_lower (s->pic[s->irq]);
1014         }
1015         break;
1016
1017     case 0x0f:                  /* irq 16 ack */
1018         retval = 0xff;
1019         if (s->mixer_regs[0x82] & 2) {
1020             ack = 1;
1021             s->mixer_regs[0x82] &= 2;
1022             qemu_irq_lower (s->pic[s->irq]);
1023         }
1024         break;
1025
1026     default:
1027         goto error;
1028     }
1029
1030     if (!ack) {
1031         ldebug ("read %#x -> %#x\n", nport, retval);
1032     }
1033
1034     return retval;
1035
1036  error:
1037     dolog ("warning: dsp_read %#x error\n", nport);
1038     return 0xff;
1039 }
1040
1041 static void reset_mixer (SB16State *s)
1042 {
1043     int i;
1044
1045     memset (s->mixer_regs, 0xff, 0x7f);
1046     memset (s->mixer_regs + 0x83, 0xff, sizeof (s->mixer_regs) - 0x83);
1047
1048     s->mixer_regs[0x02] = 4;    /* master volume 3bits */
1049     s->mixer_regs[0x06] = 4;    /* MIDI volume 3bits */
1050     s->mixer_regs[0x08] = 0;    /* CD volume 3bits */
1051     s->mixer_regs[0x0a] = 0;    /* voice volume 2bits */
1052
1053     /* d5=input filt, d3=lowpass filt, d1,d2=input source */
1054     s->mixer_regs[0x0c] = 0;
1055
1056     /* d5=output filt, d1=stereo switch */
1057     s->mixer_regs[0x0e] = 0;
1058
1059     /* voice volume L d5,d7, R d1,d3 */
1060     s->mixer_regs[0x04] = (4 << 5) | (4 << 1);
1061     /* master ... */
1062     s->mixer_regs[0x22] = (4 << 5) | (4 << 1);
1063     /* MIDI ... */
1064     s->mixer_regs[0x26] = (4 << 5) | (4 << 1);
1065
1066     for (i = 0x30; i < 0x48; i++) {
1067         s->mixer_regs[i] = 0x20;
1068     }
1069 }
1070
1071 static IO_WRITE_PROTO(mixer_write_indexb)
1072 {
1073     SB16State *s = opaque;
1074     (void) nport;
1075     s->mixer_nreg = val;
1076 }
1077
1078 static IO_WRITE_PROTO(mixer_write_datab)
1079 {
1080     SB16State *s = opaque;
1081
1082     (void) nport;
1083     ldebug ("mixer_write [%#x] <- %#x\n", s->mixer_nreg, val);
1084
1085     switch (s->mixer_nreg) {
1086     case 0x00:
1087         reset_mixer (s);
1088         break;
1089
1090     case 0x80:
1091         {
1092             int irq = irq_of_magic (val);
1093             ldebug ("setting irq to %d (val=%#x)\n", irq, val);
1094             if (irq > 0) {
1095                 s->irq = irq;
1096             }
1097         }
1098         break;
1099
1100     case 0x81:
1101         {
1102             int dma, hdma;
1103
1104             dma = lsbindex (val & 0xf);
1105             hdma = lsbindex (val & 0xf0);
1106             if (dma != s->dma || hdma != s->hdma) {
1107                 dolog (
1108                     "attempt to change DMA "
1109                     "8bit %d(%d), 16bit %d(%d) (val=%#x)\n",
1110                     dma, s->dma, hdma, s->hdma, val);
1111             }
1112 #if 0
1113             s->dma = dma;
1114             s->hdma = hdma;
1115 #endif
1116         }
1117         break;
1118
1119     case 0x82:
1120         dolog ("attempt to write into IRQ status register (val=%#x)\n",
1121                val);
1122         return;
1123
1124     default:
1125         if (s->mixer_nreg >= 0x80) {
1126             ldebug ("attempt to write mixer[%#x] <- %#x\n", s->mixer_nreg, val);
1127         }
1128         break;
1129     }
1130
1131     s->mixer_regs[s->mixer_nreg] = val;
1132 }
1133
1134 static IO_WRITE_PROTO(mixer_write_indexw)
1135 {
1136     mixer_write_indexb (opaque, nport, val & 0xff);
1137     mixer_write_datab (opaque, nport, (val >> 8) & 0xff);
1138 }
1139
1140 static IO_READ_PROTO(mixer_read)
1141 {
1142     SB16State *s = opaque;
1143
1144     (void) nport;
1145 #ifndef DEBUG_SB16_MOST
1146     if (s->mixer_nreg != 0x82) {
1147         ldebug ("mixer_read[%#x] -> %#x\n",
1148                 s->mixer_nreg, s->mixer_regs[s->mixer_nreg]);
1149     }
1150 #else
1151     ldebug ("mixer_read[%#x] -> %#x\n",
1152             s->mixer_nreg, s->mixer_regs[s->mixer_nreg]);
1153 #endif
1154     return s->mixer_regs[s->mixer_nreg];
1155 }
1156
1157 static int write_audio (SB16State *s, int nchan, int dma_pos,
1158                         int dma_len, int len)
1159 {
1160     int temp, net;
1161     uint8_t tmpbuf[4096];
1162
1163     temp = len;
1164     net = 0;
1165
1166     while (temp) {
1167         int left = dma_len - dma_pos;
1168         int copied;
1169         size_t to_copy;
1170
1171         to_copy = audio_MIN (temp, left);
1172         if (to_copy > sizeof (tmpbuf)) {
1173             to_copy = sizeof (tmpbuf);
1174         }
1175
1176         copied = DMA_read_memory (nchan, tmpbuf, dma_pos, to_copy);
1177         copied = AUD_write (s->voice, tmpbuf, copied);
1178
1179         temp -= copied;
1180         dma_pos = (dma_pos + copied) % dma_len;
1181         net += copied;
1182
1183         if (!copied) {
1184             break;
1185         }
1186     }
1187
1188     return net;
1189 }
1190
1191 static int SB_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
1192 {
1193     SB16State *s = opaque;
1194     int till, copy, written, free;
1195
1196     if (s->block_size <= 0) {
1197         dolog ("invalid block size=%d nchan=%d dma_pos=%d dma_len=%d\n",
1198                s->block_size, nchan, dma_pos, dma_len);
1199         return dma_pos;
1200     }
1201
1202     if (s->left_till_irq < 0) {
1203         s->left_till_irq = s->block_size;
1204     }
1205
1206     if (s->voice) {
1207         free = s->audio_free & ~s->align;
1208         if ((free <= 0) || !dma_len) {
1209             return dma_pos;
1210         }
1211     }
1212     else {
1213         free = dma_len;
1214     }
1215
1216     copy = free;
1217     till = s->left_till_irq;
1218
1219 #ifdef DEBUG_SB16_MOST
1220     dolog ("pos:%06d %d till:%d len:%d\n",
1221            dma_pos, free, till, dma_len);
1222 #endif
1223
1224     if (till <= copy) {
1225         if (0 == s->dma_auto) {
1226             copy = till;
1227         }
1228     }
1229
1230     written = write_audio (s, nchan, dma_pos, dma_len, copy);
1231     dma_pos = (dma_pos + written) % dma_len;
1232     s->left_till_irq -= written;
1233
1234     if (s->left_till_irq <= 0) {
1235         s->mixer_regs[0x82] |= (nchan & 4) ? 2 : 1;
1236         qemu_irq_raise (s->pic[s->irq]);
1237         if (0 == s->dma_auto) {
1238             control (s, 0);
1239             speaker (s, 0);
1240         }
1241     }
1242
1243 #ifdef DEBUG_SB16_MOST
1244     ldebug ("pos %5d free %5d size %5d till % 5d copy %5d written %5d size %5d\n",
1245             dma_pos, free, dma_len, s->left_till_irq, copy, written,
1246             s->block_size);
1247 #endif
1248
1249     while (s->left_till_irq <= 0) {
1250         s->left_till_irq = s->block_size + s->left_till_irq;
1251     }
1252
1253     return dma_pos;
1254 }
1255
1256 static void SB_audio_callback (void *opaque, int free)
1257 {
1258     SB16State *s = opaque;
1259     s->audio_free = free;
1260 }
1261
1262 static void SB_save (QEMUFile *f, void *opaque)
1263 {
1264     SB16State *s = opaque;
1265
1266     qemu_put_be32 (f, s->irq);
1267     qemu_put_be32 (f, s->dma);
1268     qemu_put_be32 (f, s->hdma);
1269     qemu_put_be32 (f, s->port);
1270     qemu_put_be32 (f, s->ver);
1271     qemu_put_be32 (f, s->in_index);
1272     qemu_put_be32 (f, s->out_data_len);
1273     qemu_put_be32 (f, s->fmt_stereo);
1274     qemu_put_be32 (f, s->fmt_signed);
1275     qemu_put_be32 (f, s->fmt_bits);
1276     qemu_put_be32s (f, &s->fmt);
1277     qemu_put_be32 (f, s->dma_auto);
1278     qemu_put_be32 (f, s->block_size);
1279     qemu_put_be32 (f, s->fifo);
1280     qemu_put_be32 (f, s->freq);
1281     qemu_put_be32 (f, s->time_const);
1282     qemu_put_be32 (f, s->speaker);
1283     qemu_put_be32 (f, s->needed_bytes);
1284     qemu_put_be32 (f, s->cmd);
1285     qemu_put_be32 (f, s->use_hdma);
1286     qemu_put_be32 (f, s->highspeed);
1287     qemu_put_be32 (f, s->can_write);
1288     qemu_put_be32 (f, s->v2x6);
1289
1290     qemu_put_8s (f, &s->csp_param);
1291     qemu_put_8s (f, &s->csp_value);
1292     qemu_put_8s (f, &s->csp_mode);
1293     qemu_put_8s (f, &s->csp_param);
1294     qemu_put_buffer (f, s->csp_regs, 256);
1295     qemu_put_8s (f, &s->csp_index);
1296     qemu_put_buffer (f, s->csp_reg83, 4);
1297     qemu_put_be32 (f, s->csp_reg83r);
1298     qemu_put_be32 (f, s->csp_reg83w);
1299
1300     qemu_put_buffer (f, s->in2_data, sizeof (s->in2_data));
1301     qemu_put_buffer (f, s->out_data, sizeof (s->out_data));
1302     qemu_put_8s (f, &s->test_reg);
1303     qemu_put_8s (f, &s->last_read_byte);
1304
1305     qemu_put_be32 (f, s->nzero);
1306     qemu_put_be32 (f, s->left_till_irq);
1307     qemu_put_be32 (f, s->dma_running);
1308     qemu_put_be32 (f, s->bytes_per_second);
1309     qemu_put_be32 (f, s->align);
1310
1311     qemu_put_be32 (f, s->mixer_nreg);
1312     qemu_put_buffer (f, s->mixer_regs, 256);
1313 }
1314
1315 static int SB_load (QEMUFile *f, void *opaque, int version_id)
1316 {
1317     SB16State *s = opaque;
1318
1319     if (version_id != 1) {
1320         return -EINVAL;
1321     }
1322
1323     s->irq=qemu_get_be32 (f);
1324     s->dma=qemu_get_be32 (f);
1325     s->hdma=qemu_get_be32 (f);
1326     s->port=qemu_get_be32 (f);
1327     s->ver=qemu_get_be32 (f);
1328     s->in_index=qemu_get_be32 (f);
1329     s->out_data_len=qemu_get_be32 (f);
1330     s->fmt_stereo=qemu_get_be32 (f);
1331     s->fmt_signed=qemu_get_be32 (f);
1332     s->fmt_bits=qemu_get_be32 (f);
1333     qemu_get_be32s (f, &s->fmt);
1334     s->dma_auto=qemu_get_be32 (f);
1335     s->block_size=qemu_get_be32 (f);
1336     s->fifo=qemu_get_be32 (f);
1337     s->freq=qemu_get_be32 (f);
1338     s->time_const=qemu_get_be32 (f);
1339     s->speaker=qemu_get_be32 (f);
1340     s->needed_bytes=qemu_get_be32 (f);
1341     s->cmd=qemu_get_be32 (f);
1342     s->use_hdma=qemu_get_be32 (f);
1343     s->highspeed=qemu_get_be32 (f);
1344     s->can_write=qemu_get_be32 (f);
1345     s->v2x6=qemu_get_be32 (f);
1346
1347     qemu_get_8s (f, &s->csp_param);
1348     qemu_get_8s (f, &s->csp_value);
1349     qemu_get_8s (f, &s->csp_mode);
1350     qemu_get_8s (f, &s->csp_param);
1351     qemu_get_buffer (f, s->csp_regs, 256);
1352     qemu_get_8s (f, &s->csp_index);
1353     qemu_get_buffer (f, s->csp_reg83, 4);
1354     s->csp_reg83r=qemu_get_be32 (f);
1355     s->csp_reg83w=qemu_get_be32 (f);
1356
1357     qemu_get_buffer (f, s->in2_data, sizeof (s->in2_data));
1358     qemu_get_buffer (f, s->out_data, sizeof (s->out_data));
1359     qemu_get_8s (f, &s->test_reg);
1360     qemu_get_8s (f, &s->last_read_byte);
1361
1362     s->nzero=qemu_get_be32 (f);
1363     s->left_till_irq=qemu_get_be32 (f);
1364     s->dma_running=qemu_get_be32 (f);
1365     s->bytes_per_second=qemu_get_be32 (f);
1366     s->align=qemu_get_be32 (f);
1367
1368     s->mixer_nreg=qemu_get_be32 (f);
1369     qemu_get_buffer (f, s->mixer_regs, 256);
1370
1371     if (s->voice) {
1372         AUD_close_out (&s->card, s->voice);
1373         s->voice = NULL;
1374     }
1375
1376     if (s->dma_running) {
1377         if (s->freq) {
1378             struct audsettings as;
1379
1380             s->audio_free = 0;
1381
1382             as.freq = s->freq;
1383             as.nchannels = 1 << s->fmt_stereo;
1384             as.fmt = s->fmt;
1385             as.endianness = 0;
1386
1387             s->voice = AUD_open_out (
1388                 &s->card,
1389                 s->voice,
1390                 "sb16",
1391                 s,
1392                 SB_audio_callback,
1393                 &as
1394                 );
1395         }
1396
1397         control (s, 1);
1398         speaker (s, s->speaker);
1399     }
1400     return 0;
1401 }
1402
1403 int SB16_init (AudioState *audio, qemu_irq *pic)
1404 {
1405     SB16State *s;
1406     int i;
1407     static const uint8_t dsp_write_ports[] = {0x6, 0xc};
1408     static const uint8_t dsp_read_ports[] = {0x6, 0xa, 0xc, 0xd, 0xe, 0xf};
1409
1410     if (!audio) {
1411         dolog ("No audio state\n");
1412         return -1;
1413     }
1414
1415     s = qemu_mallocz (sizeof (*s));
1416     if (!s) {
1417         dolog ("Could not allocate memory for SB16 (%zu bytes)\n",
1418                sizeof (*s));
1419         return -1;
1420     }
1421
1422     s->cmd = -1;
1423     s->pic = pic;
1424     s->irq = conf.irq;
1425     s->dma = conf.dma;
1426     s->hdma = conf.hdma;
1427     s->port = conf.port;
1428     s->ver = conf.ver_lo | (conf.ver_hi << 8);
1429
1430     s->mixer_regs[0x80] = magic_of_irq (s->irq);
1431     s->mixer_regs[0x81] = (1 << s->dma) | (1 << s->hdma);
1432     s->mixer_regs[0x82] = 2 << 5;
1433
1434     s->csp_regs[5] = 1;
1435     s->csp_regs[9] = 0xf8;
1436
1437     reset_mixer (s);
1438     s->aux_ts = qemu_new_timer (vm_clock, aux_timer, s);
1439     if (!s->aux_ts) {
1440         dolog ("warning: Could not create auxiliary timer\n");
1441     }
1442
1443     for (i = 0; i < LENOFA (dsp_write_ports); i++) {
1444         register_ioport_write (s->port + dsp_write_ports[i], 1, 1, dsp_write, s);
1445     }
1446
1447     for (i = 0; i < LENOFA (dsp_read_ports); i++) {
1448         register_ioport_read (s->port + dsp_read_ports[i], 1, 1, dsp_read, s);
1449     }
1450
1451     register_ioport_write (s->port + 0x4, 1, 1, mixer_write_indexb, s);
1452     register_ioport_write (s->port + 0x4, 1, 2, mixer_write_indexw, s);
1453     register_ioport_read (s->port + 0x5, 1, 1, mixer_read, s);
1454     register_ioport_write (s->port + 0x5, 1, 1, mixer_write_datab, s);
1455
1456     DMA_register_channel (s->hdma, SB_read_DMA, s);
1457     DMA_register_channel (s->dma, SB_read_DMA, s);
1458     s->can_write = 1;
1459
1460     register_savevm ("sb16", 0, 1, SB_save, SB_load, s);
1461     AUD_register_card (audio, "sb16", &s->card);
1462     return 0;
1463 }