1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2004 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 M�quignon
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
Audio_Available(void)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
Audio_DeleteDevice(SDL_AudioDevice * device)122 static void Audio_DeleteDevice(SDL_AudioDevice *device)
123 {
124 SDL_free(device->hidden);
125 SDL_free(device);
126 }
127
Audio_CreateDevice(int devindex)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
Mint_LockAudio(_THIS)163 static void Mint_LockAudio(_THIS)
164 {
165 /* Stop replay */
166 Buffoper(0);
167 }
168
Mint_UnlockAudio(_THIS)169 static void Mint_UnlockAudio(_THIS)
170 {
171 /* Restart replay */
172 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
173 }
174
Mint_CloseAudio(_THIS)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 */
Devconnect2(int src,int dst,int sclk,int pre)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
Mint_CheckExternalClock(_THIS)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
Mint_CheckAudio(_THIS,SDL_AudioSpec * spec)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
Mint_InitAudio(_THIS,SDL_AudioSpec * spec)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
Mint_OpenAudio(_THIS,SDL_AudioSpec * spec)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 }
496