src/audio/mint/SDL_mintaudio_xbios.c

   1 /*
   2     SDL - Simple DirectMedia Layer
   3     Copyright (C) 1997-2009 Sam Lantinga
   4
   5     This library is free software; you can redistribute it and/or
   6     modify it under the terms of the GNU Library General Public
   7     License as published by the Free Software Foundation; either
   8     version 2 of the License, or (at your option) any later version.
   9
  10     This library is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13     Library General Public License for more details.
  14
  15     You should have received a copy of the GNU Library General Public
  16     License along with this library; if not, write to the Free
  17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18
  19     Sam Lantinga
  20     slouken@libsdl.org
  21 */
  22 #include "SDL_config.h"
  23
  24 /*
  25         MiNT audio driver
  26         using XBIOS functions (Falcon)
  27
  28         Patrice Mandin, Didier Méquignon
  29 */
  30
  31 #include <unistd.h>
  32 #include <support.h>
  33
  34 /* Mint includes */
  35 #include <mint/osbind.h>
  36 #include <mint/falcon.h>
  37 #include <mint/cookie.h>
  38
  39 #include "SDL_audio.h"
  40 #include "../SDL_audio_c.h"
  41 #include "../SDL_sysaudio.h"
  42
  43 #include "../../video/ataricommon/SDL_atarimxalloc_c.h"
  44
  45 #include "SDL_mintaudio.h"
  46 #include "SDL_mintaudio_dma8.h"
  47
  48 /*--- Defines ---*/
  49
  50 #define MINT_AUDIO_DRIVER_NAME "mint_xbios"
  51
  52 /* Debug print info */
  53 #define DEBUG_NAME "audio:xbios: "
  54 #if 0
  55 #define DEBUG_PRINT(what) \
  56         { \
  57                 printf what; \
  58         }
  59 #else
  60 #define DEBUG_PRINT(what)
  61 #endif
  62
  63 /*--- Static variables ---*/
  64
  65 static unsigned long cookie_snd;
  66
  67 /*--- Audio driver functions ---*/
  68
  69 static void Mint_CloseAudio(_THIS);
  70 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
  71 static void Mint_LockAudio(_THIS);
  72 static void Mint_UnlockAudio(_THIS);
  73
  74 /* To check/init hardware audio */
  75 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
  76 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
  77
  78 /*--- Audio driver bootstrap functions ---*/
  79
  80 static int Audio_Available(void)
  81 {
  82         unsigned long dummy;
  83         const char *envr = SDL_getenv("SDL_AUDIODRIVER");
  84
  85         /*SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);*/
  86         SDL_MintAudio_mint_present = SDL_FALSE;
  87
  88         /* We can't use XBIOS in interrupt with Magic, don't know about thread */
  89         /*if (Getcookie(C_MagX, &dummy) == C_FOUND) {
  90                 return(0);
  91         }*/
  92
  93         /* Check if user asked a different audio driver */
  94         if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
  95                 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
  96                 return(0);
  97         }
  98
  99         /* Cookie _SND present ? if not, assume ST machine */
 100         if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
 101                 cookie_snd = SND_PSG;
 102         }
 103
 104         /* Check if we have 16 bits audio */
 105         if ((cookie_snd & SND_16BIT)==0) {
 106                 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
 107             return(0);
 108         }
 109
 110         /* Check if audio is lockable */
 111         if (Locksnd()!=1) {
 112                 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
 113                 return(0);
 114         }
 115
 116         Unlocksnd();
 117
 118         DEBUG_PRINT((DEBUG_NAME "XBIOS audio available!\n"));
 119         return(1);
 120 }
 121
 122 static void Audio_DeleteDevice(SDL_AudioDevice *device)
 123 {
 124     SDL_free(device->hidden);
 125     SDL_free(device);
 126 }
 127
 128 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
 129 {
 130         SDL_AudioDevice *this;
 131
 132         /* Initialize all variables that we clean on shutdown */
 133         this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
 134     if ( this ) {
 135         SDL_memset(this, 0, (sizeof *this));
 136         this->hidden = (struct SDL_PrivateAudioData *)
 137                 SDL_malloc((sizeof *this->hidden));
 138     }
 139     if ( (this == NULL) || (this->hidden == NULL) ) {
 140         SDL_OutOfMemory();
 141         if ( this ) {
 142             SDL_free(this);
 143         }
 144         return(0);
 145     }
 146     SDL_memset(this->hidden, 0, (sizeof *this->hidden));
 147
 148     /* Set the function pointers */
 149     this->OpenAudio   = Mint_OpenAudio;
 150     this->CloseAudio  = Mint_CloseAudio;
 151     this->LockAudio   = Mint_LockAudio;
 152     this->UnlockAudio = Mint_UnlockAudio;
 153     this->free        = Audio_DeleteDevice;
 154
 155     return this;
 156 }
 157
 158 AudioBootStrap MINTAUDIO_XBIOS_bootstrap = {
 159         MINT_AUDIO_DRIVER_NAME, "MiNT XBIOS audio driver",
 160         Audio_Available, Audio_CreateDevice
 161 };
 162
 163 static void Mint_LockAudio(_THIS)
 164 {
 165         /* Stop replay */
 166         Buffoper(0);
 167 }
 168
 169 static void Mint_UnlockAudio(_THIS)
 170 {
 171         /* Restart replay */
 172         Buffoper(SB_PLA_ENA|SB_PLA_RPT);
 173 }
 174
 175 static void Mint_CloseAudio(_THIS)
 176 {
 177         /* Stop replay */
 178         SDL_MintAudio_WaitThread();
 179         Buffoper(0);
 180
 181         if (!SDL_MintAudio_mint_present) {
 182                 /* Uninstall interrupt */
 183                 Jdisint(MFP_DMASOUND);
 184         }
 185
 186         /* Wait if currently playing sound */
 187         while (SDL_MintAudio_mutex != 0) {
 188         }
 189
 190         /* Clear buffers */
 191         if (SDL_MintAudio_audiobuf[0]) {
 192                 Mfree(SDL_MintAudio_audiobuf[0]);
 193                 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
 194         }
 195
 196         /* Unlock sound system */
 197         Unlocksnd();
 198 }
 199
 200 /* Falcon XBIOS implementation of Devconnect() is buggy with external clock */
 201 static void Devconnect2(int src, int dst, int sclk, int pre)
 202 {
 203         static const unsigned short MASK1[3] = { 0, 0x6000, 0 };
 204         static const unsigned short MASK2[4] = { 0xFFF0, 0xFF8F, 0xF0FF, 0x0FFF };
 205         static const unsigned short INDEX1[4] = {  1, 3, 5, 7 };
 206         static const unsigned short INDEX2[4] = {  0, 2, 4, 6 };
 207         unsigned short sync_div,dev_ctrl,dest_ctrl;
 208         void *oldstack;
 209
 210         if (dst==0) {
 211                 return;
 212         }
 213
 214         oldstack=(void *)Super(0);
 215
 216         dev_ctrl = DMAAUDIO_IO.dev_ctrl;
 217         dest_ctrl = DMAAUDIO_IO.dest_ctrl;
 218         dev_ctrl &= MASK2[src];
 219
 220         if (src==ADC) {
 221                 dev_ctrl |= MASK1[sclk];
 222         } else {
 223                 dev_ctrl |= (INDEX1[sclk] << (src<<4));
 224         }
 225
 226         if (dst & DMAREC) {
 227                 dest_ctrl &= 0xFFF0;
 228                 dest_ctrl |= INDEX1[src];
 229         }
 230
 231         if (dst & DSPRECV) {
 232                 dest_ctrl &= 0xFF8F;
 233                 dest_ctrl |= (INDEX1[src]<<4);
 234         }
 235
 236         if (dst & EXTOUT) {
 237                 dest_ctrl &= 0xF0FF;
 238                 dest_ctrl |= (INDEX1[src]<<8);
 239         }
 240
 241         if (dst & DAC) {
 242                 dev_ctrl &= 0x0FFF;
 243                 dev_ctrl |= MASK1[sclk];
 244                 dest_ctrl &=  0x0FFF;
 245                 dest_ctrl |= (INDEX2[src]<<12);
 246         }
 247
 248         sync_div = DMAAUDIO_IO.sync_div;
 249         if (sclk==CLKEXT) {
 250                 pre<<=8;
 251                 sync_div &= 0xF0FF;
 252         } else {
 253                 sync_div &= 0xFFF0;
 254         }
 255         sync_div |= pre;
 256
 257         DMAAUDIO_IO.dev_ctrl = dev_ctrl;
 258         DMAAUDIO_IO.dest_ctrl = dest_ctrl;
 259         DMAAUDIO_IO.sync_div = sync_div;
 260
 261         Super(oldstack);
 262 }
 263
 264 static void Mint_CheckExternalClock(_THIS)
 265 {
 266 #define SIZE_BUF_CLOCK_MEASURE (44100/10)
 267
 268         unsigned long cookie_snd;
 269         char *buffer;
 270         int i, j;
 271
 272         /* DSP present with its GPIO port ? */
 273         if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
 274                 return;
 275         }
 276         if ((cookie_snd & SND_DSP)==0) {
 277                 return;
 278         }
 279
 280         buffer = Atari_SysMalloc(SIZE_BUF_CLOCK_MEASURE, MX_STRAM);
 281         if (buffer==NULL) {
 282                 DEBUG_PRINT((DEBUG_NAME "Not enough memory for the measure\n"));
 283                 return;
 284         }
 285         SDL_memset(buffer, 0, SIZE_BUF_CLOCK_MEASURE);
 286
 287         Buffoper(0);
 288         Settracks(0,0);
 289         Setmontracks(0);
 290         Setmode(MONO8);
 291         Jdisint(MFP_TIMERA);
 292
 293         for (i=0; i<2; i++) {
 294                 Gpio(GPIO_SET,7);      /* DSP port gpio outputs */
 295                 Gpio(GPIO_WRITE,2+i);  /* 22.5792/24.576 MHz for 44.1/48KHz */
 296                 Devconnect2(DMAPLAY, DAC, CLKEXT, CLK50K);  /* Matrix and clock source */
 297                 Setbuffer(0, buffer, buffer + SIZE_BUF_CLOCK_MEASURE);                     /* Set buffer */
 298                 Xbtimer(XB_TIMERA, 5, 38, SDL_MintAudio_XbiosInterruptMeasureClock); /* delay mode timer A, prediv /64, 1KHz */
 299                 Jenabint(MFP_TIMERA);
 300                 SDL_MintAudio_clocktics = 0;
 301                 Buffoper(SB_PLA_ENA);
 302                 usleep(110000);
 303
 304                 if((Buffoper(-1) & 1)==0) {
 305                         if (SDL_MintAudio_clocktics) {
 306                                 unsigned long khz;
 307
 308                                 khz = ((SIZE_BUF_CLOCK_MEASURE/SDL_MintAudio_clocktics) +1) & 0xFFFFFFFE;
 309                                 DEBUG_PRINT((DEBUG_NAME "measure %d: freq=%lu KHz\n", i+1, khz));
 310
 311                                 if(khz==44) {
 312                                         for (j=1; j<4; j++) {
 313                                                 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_44K/(MASTERPREDIV_FALCON*(1<<j)), MASTERCLOCK_44K, (1<<j)-1, 2+i);
 314                                         }
 315                                 } else if (khz==48) {
 316                                         for (j=1; j<4; j++) {
 317                                                 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_48K/(MASTERPREDIV_FALCON*(1<<j)), MASTERCLOCK_48K, (1<<j)-1, 2+i);
 318                                         }
 319                                 }
 320                         } else {
 321                                 DEBUG_PRINT((DEBUG_NAME "No measure\n"));
 322                         }
 323                 } else {
 324                         DEBUG_PRINT((DEBUG_NAME "No SDMA clock\n"));
 325                 }
 326
 327                 Buffoper(0);             /* stop */
 328                 Jdisint(MFP_TIMERA);     /* Uninstall interrupt */
 329         }
 330
 331         Mfree(buffer);
 332 }
 333
 334 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
 335 {
 336         int i;
 337         Uint32 extclock;
 338
 339         DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
 340         DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
 341         DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
 342         DEBUG_PRINT(("channels=%d, ", spec->channels));
 343         DEBUG_PRINT(("freq=%d\n", spec->freq));
 344
 345     if (spec->channels > 2) {
 346         spec->channels = 2;  /* no more than stereo! */
 347     }
 348
 349         spec->format |= 0x8000; /* Audio is always signed */
 350         if ((spec->format & 0x00ff)==16) {
 351                 spec->format |= 0x1000; /* Audio is always big endian */
 352                 spec->channels=2;       /* 16 bits always stereo */
 353         }
 354
 355         MINTAUDIO_freqcount=0;
 356
 357         /* Add external clocks if present */
 358         Mint_CheckExternalClock(this);
 359
 360         /* Standard clocks */
 361         for (i=1;i<12;i++) {
 362                 /* Remove unusable Falcon codec predivisors */
 363                 if ((i==6) || (i==8) || (i==10)) {
 364                         continue;
 365                 }
 366                 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)), MASTERCLOCK_FALCON1, i, -1);
 367         }
 368
 369 #if 1
 370         for (i=0; i<MINTAUDIO_freqcount; i++) {
 371                 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
 372                         i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
 373                         MINTAUDIO_frequencies[i].predivisor
 374                 ));
 375         }
 376 #endif
 377
 378         MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
 379         spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
 380
 381         DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
 382         DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
 383         DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
 384         DEBUG_PRINT(("channels=%d, ", spec->channels));
 385         DEBUG_PRINT(("freq=%d\n", spec->freq));
 386
 387         return 0;
 388 }
 389
 390 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
 391 {
 392         int channels_mode, dmaclock, prediv;
 393         void *buffer;
 394
 395         /* Stop currently playing sound */
 396         SDL_MintAudio_quit_thread = SDL_FALSE;
 397         SDL_MintAudio_thread_finished = SDL_TRUE;
 398         SDL_MintAudio_WaitThread();
 399         Buffoper(0);
 400
 401         /* Set replay tracks */
 402         Settracks(0,0);
 403         Setmontracks(0);
 404
 405         /* Select replay format */
 406         channels_mode=STEREO16;
 407         switch (spec->format & 0xff) {
 408                 case 8:
 409                         if (spec->channels==2) {
 410                                 channels_mode=STEREO8;
 411                         } else {
 412                                 channels_mode=MONO8;
 413                         }
 414                         break;
 415         }
 416         if (Setmode(channels_mode)<0) {
 417                 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
 418         }
 419
 420         dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
 421         prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
 422         if (MINTAUDIO_frequencies[MINTAUDIO_numfreq].gpio_bits != -1) {
 423                 Gpio(GPIO_SET,7);               /* DSP port gpio outputs */
 424                 Gpio(GPIO_WRITE, MINTAUDIO_frequencies[MINTAUDIO_numfreq].gpio_bits);
 425                 Devconnect2(DMAPLAY, DAC|EXTOUT, CLKEXT, prediv);
 426         } else {
 427                 Devconnect2(DMAPLAY, DAC, CLK25M, prediv);
 428         }
 429
 430         /* Set buffer */
 431         buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
 432         if (Setbuffer(0, buffer, buffer + spec->size)<0) {
 433                 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
 434         }
 435
 436         if (SDL_MintAudio_mint_present) {
 437                 SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0);
 438         } else {
 439                 /* Install interrupt */
 440                 Jdisint(MFP_DMASOUND);
 441                 /*Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);*/
 442                 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
 443                 Jenabint(MFP_DMASOUND);
 444
 445                 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
 446                         DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
 447                 }
 448         }
 449
 450         /* Go */
 451         Buffoper(SB_PLA_ENA|SB_PLA_RPT);
 452         DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
 453 }
 454
 455 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
 456 {
 457         /* Lock sound system */
 458         if (Locksnd()!=1) {
 459             SDL_SetError("Mint_OpenAudio: Audio system already in use");
 460         return(-1);
 461         }
 462
 463         SDL_MintAudio_device = this;
 464
 465         /* Check audio capabilities */
 466         if (Mint_CheckAudio(this, spec)==-1) {
 467                 return -1;
 468         }
 469
 470         SDL_CalculateAudioSpec(spec);
 471
 472         /* Allocate memory for audio buffers in DMA-able RAM */
 473         DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
 474
 475         SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
 476         if (SDL_MintAudio_audiobuf[0]==NULL) {
 477                 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
 478                 return (-1);
 479         }
 480         SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
 481         SDL_MintAudio_numbuf=0;
 482         SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
 483         SDL_MintAudio_audiosize = spec->size;
 484         SDL_MintAudio_mutex = 0;
 485
 486         DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
 487         DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
 488
 489         SDL_MintAudio_CheckFpu();
 490
 491         /* Setup audio hardware */
 492         Mint_InitAudio(this, spec);
 493
 494     return(1);  /* We don't use SDL threaded audio */
 495 }