1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2012 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 #include "../../video/ataricommon/SDL_atarisuper.h"
45
46 #include "SDL_mintaudio.h"
47 #include "SDL_mintaudio_dma8.h"
48
49 /*--- Defines ---*/
50
51 #define MINT_AUDIO_DRIVER_NAME "mint_xbios"
52
53 /* Debug print info */
54 #define DEBUG_NAME "audio:xbios: "
55 #if 0
56 #define DEBUG_PRINT(what) \
57 { \
58 printf what; \
59 }
60 #else
61 #define DEBUG_PRINT(what)
62 #endif
63
64 /*--- Static variables ---*/
65
66 static long cookie_snd;
67
68 /*--- Audio driver functions ---*/
69
70 static void Mint_CloseAudio(_THIS);
71 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
72 static void Mint_LockAudio(_THIS);
73 static void Mint_UnlockAudio(_THIS);
74
75 /* To check/init hardware audio */
76 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
77 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
78
79 /*--- Audio driver bootstrap functions ---*/
80
Audio_Available(void)81 static int Audio_Available(void)
82 {
83 /* unsigned long dummy;*/
84 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
85
86 /*SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);*/
87 SDL_MintAudio_mint_present = SDL_FALSE;
88
89 /* We can't use XBIOS in interrupt with Magic, don't know about thread */
90 /*if (Getcookie(C_MagX, &dummy) == C_FOUND) {
91 return(0);
92 }*/
93
94 /* Check if user asked a different audio driver */
95 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
96 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
97 return(0);
98 }
99
100 /* Cookie _SND present ? if not, assume ST machine */
101 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
102 cookie_snd = SND_PSG;
103 }
104
105 /* Check if we have 16 bits audio */
106 if ((cookie_snd & SND_16BIT)==0) {
107 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
108 return(0);
109 }
110
111 /* Check if audio is lockable */
112 if (Locksnd()!=1) {
113 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
114 return(0);
115 }
116
117 Unlocksnd();
118
119 DEBUG_PRINT((DEBUG_NAME "XBIOS audio available!\n"));
120 return(1);
121 }
122
Audio_DeleteDevice(SDL_AudioDevice * device)123 static void Audio_DeleteDevice(SDL_AudioDevice *device)
124 {
125 SDL_free(device->hidden);
126 SDL_free(device);
127 }
128
Audio_CreateDevice(int devindex)129 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
130 {
131 SDL_AudioDevice *this;
132
133 /* Initialize all variables that we clean on shutdown */
134 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
135 if ( this ) {
136 SDL_memset(this, 0, (sizeof *this));
137 this->hidden = (struct SDL_PrivateAudioData *)
138 SDL_malloc((sizeof *this->hidden));
139 }
140 if ( (this == NULL) || (this->hidden == NULL) ) {
141 SDL_OutOfMemory();
142 if ( this ) {
143 SDL_free(this);
144 }
145 return(0);
146 }
147 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
148
149 /* Set the function pointers */
150 this->OpenAudio = Mint_OpenAudio;
151 this->CloseAudio = Mint_CloseAudio;
152 this->LockAudio = Mint_LockAudio;
153 this->UnlockAudio = Mint_UnlockAudio;
154 this->free = Audio_DeleteDevice;
155
156 return this;
157 }
158
159 AudioBootStrap MINTAUDIO_XBIOS_bootstrap = {
160 MINT_AUDIO_DRIVER_NAME, "MiNT XBIOS audio driver",
161 Audio_Available, Audio_CreateDevice
162 };
163
Mint_LockAudio(_THIS)164 static void Mint_LockAudio(_THIS)
165 {
166 /* Stop replay */
167 Buffoper(0);
168 }
169
Mint_UnlockAudio(_THIS)170 static void Mint_UnlockAudio(_THIS)
171 {
172 /* Restart replay */
173 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
174 }
175
Mint_CloseAudio(_THIS)176 static void Mint_CloseAudio(_THIS)
177 {
178 /* Stop replay */
179 SDL_MintAudio_WaitThread();
180 Buffoper(0);
181
182 if (!SDL_MintAudio_mint_present) {
183 /* Uninstall interrupt */
184 Jdisint(MFP_DMASOUND);
185 }
186
187 /* Wait if currently playing sound */
188 while (SDL_MintAudio_mutex != 0) {
189 }
190
191 /* Clear buffers */
192 if (SDL_MintAudio_audiobuf[0]) {
193 Mfree(SDL_MintAudio_audiobuf[0]);
194 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
195 }
196
197 /* Unlock sound system */
198 Unlocksnd();
199 }
200
201 /* Falcon XBIOS implementation of Devconnect() is buggy with external clock */
Devconnect2(int src,int dst,int sclk,int pre)202 static void Devconnect2(int src, int dst, int sclk, int pre)
203 {
204 static const unsigned short MASK1[3] = { 0, 0x6000, 0 };
205 static const unsigned short MASK2[4] = { 0xFFF0, 0xFF8F, 0xF0FF, 0x0FFF };
206 static const unsigned short INDEX1[4] = { 1, 3, 5, 7 };
207 static const unsigned short INDEX2[4] = { 0, 2, 4, 6 };
208 unsigned short sync_div,dev_ctrl,dest_ctrl;
209 void *oldstack;
210
211 if (dst==0) {
212 return;
213 }
214
215 oldstack=(void *)Super(0);
216
217 dev_ctrl = DMAAUDIO_IO.dev_ctrl;
218 dest_ctrl = DMAAUDIO_IO.dest_ctrl;
219 dev_ctrl &= MASK2[src];
220
221 if (src==ADC) {
222 dev_ctrl |= MASK1[sclk];
223 } else {
224 dev_ctrl |= (INDEX1[sclk] << (src<<4));
225 }
226
227 if (dst & DMAREC) {
228 dest_ctrl &= 0xFFF0;
229 dest_ctrl |= INDEX1[src];
230 }
231
232 if (dst & DSPRECV) {
233 dest_ctrl &= 0xFF8F;
234 dest_ctrl |= (INDEX1[src]<<4);
235 }
236
237 if (dst & EXTOUT) {
238 dest_ctrl &= 0xF0FF;
239 dest_ctrl |= (INDEX1[src]<<8);
240 }
241
242 if (dst & DAC) {
243 dev_ctrl &= 0x0FFF;
244 dev_ctrl |= MASK1[sclk];
245 dest_ctrl &= 0x0FFF;
246 dest_ctrl |= (INDEX2[src]<<12);
247 }
248
249 sync_div = DMAAUDIO_IO.sync_div;
250 if (sclk==CLKEXT) {
251 pre<<=8;
252 sync_div &= 0xF0FF;
253 } else {
254 sync_div &= 0xFFF0;
255 }
256 sync_div |= pre;
257
258 DMAAUDIO_IO.dev_ctrl = dev_ctrl;
259 DMAAUDIO_IO.dest_ctrl = dest_ctrl;
260 DMAAUDIO_IO.sync_div = sync_div;
261
262 SuperToUser(oldstack);
263 }
264
Mint_CheckExternalClock(_THIS)265 static void Mint_CheckExternalClock(_THIS)
266 {
267 #define SIZE_BUF_CLOCK_MEASURE (44100/10)
268
269 char *buffer;
270 int i, j;
271
272 /* DSP present with its GPIO port ? */
273 if ((cookie_snd & SND_DSP)==0) {
274 return;
275 }
276
277 buffer = Atari_SysMalloc(SIZE_BUF_CLOCK_MEASURE, MX_STRAM);
278 if (buffer==NULL) {
279 DEBUG_PRINT((DEBUG_NAME "Not enough memory for the measure\n"));
280 return;
281 }
282 SDL_memset(buffer, 0, SIZE_BUF_CLOCK_MEASURE);
283
284 Buffoper(0);
285 Settracks(0,0);
286 Setmontracks(0);
287 Setmode(MONO8);
288 Jdisint(MFP_TIMERA);
289
290 for (i=0; i<2; i++) {
291 Gpio(GPIO_SET,7); /* DSP port gpio outputs */
292 Gpio(GPIO_WRITE,2+i); /* 22.5792/24.576 MHz for 44.1/48KHz */
293 Devconnect2(DMAPLAY, DAC, CLKEXT, CLK50K); /* Matrix and clock source */
294 Setbuffer(0, buffer, buffer + SIZE_BUF_CLOCK_MEASURE); /* Set buffer */
295 Xbtimer(XB_TIMERA, 5, 38, SDL_MintAudio_XbiosInterruptMeasureClock); /* delay mode timer A, prediv /64, 1KHz */
296 Jenabint(MFP_TIMERA);
297 SDL_MintAudio_clocktics = 0;
298 Buffoper(SB_PLA_ENA);
299 usleep(110000);
300
301 if((Buffoper(-1) & 1)==0) {
302 if (SDL_MintAudio_clocktics) {
303 unsigned long khz;
304
305 khz = ((SIZE_BUF_CLOCK_MEASURE/SDL_MintAudio_clocktics) +1) & 0xFFFFFFFE;
306 DEBUG_PRINT((DEBUG_NAME "measure %d: freq=%lu KHz\n", i+1, khz));
307
308 if(khz==44) {
309 for (j=1; j<4; j++) {
310 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_44K/(MASTERPREDIV_FALCON*(1<<j)), MASTERCLOCK_44K, (1<<j)-1, 2+i);
311 }
312 } else if (khz==48) {
313 for (j=1; j<4; j++) {
314 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_48K/(MASTERPREDIV_FALCON*(1<<j)), MASTERCLOCK_48K, (1<<j)-1, 2+i);
315 }
316 }
317 } else {
318 DEBUG_PRINT((DEBUG_NAME "No measure\n"));
319 }
320 } else {
321 DEBUG_PRINT((DEBUG_NAME "No SDMA clock\n"));
322 }
323
324 Buffoper(0); /* stop */
325 Jdisint(MFP_TIMERA); /* Uninstall interrupt */
326 }
327
328 Mfree(buffer);
329 }
330
Mint_CheckAudio(_THIS,SDL_AudioSpec * spec)331 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
332 {
333 int i;
334
335 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
336 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
337 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
338 DEBUG_PRINT(("channels=%d, ", spec->channels));
339 DEBUG_PRINT(("freq=%d\n", spec->freq));
340
341 if (spec->channels > 2) {
342 spec->channels = 2; /* no more than stereo! */
343 }
344
345 spec->format |= 0x8000; /* Audio is always signed */
346 if ((spec->format & 0x00ff)==16) {
347 spec->format |= 0x1000; /* Audio is always big endian */
348 spec->channels=2; /* 16 bits always stereo */
349 }
350
351 MINTAUDIO_freqcount=0;
352
353 /* Add external clocks if present */
354 Mint_CheckExternalClock(this);
355
356 /* Standard clocks */
357 for (i=1;i<12;i++) {
358 /* Remove unusable Falcon codec predivisors */
359 if ((i==6) || (i==8) || (i==10)) {
360 continue;
361 }
362 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)), MASTERCLOCK_FALCON1, i, -1);
363 }
364
365 #if 1
366 for (i=0; i<MINTAUDIO_freqcount; i++) {
367 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
368 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
369 MINTAUDIO_frequencies[i].predivisor
370 ));
371 }
372 #endif
373
374 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
375 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
376
377 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
378 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
379 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
380 DEBUG_PRINT(("channels=%d, ", spec->channels));
381 DEBUG_PRINT(("freq=%d\n", spec->freq));
382
383 return 0;
384 }
385
Mint_InitAudio(_THIS,SDL_AudioSpec * spec)386 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
387 {
388 int channels_mode, prediv;
389 void *buffer;
390
391 /* Stop currently playing sound */
392 SDL_MintAudio_quit_thread = SDL_FALSE;
393 SDL_MintAudio_thread_finished = SDL_TRUE;
394 SDL_MintAudio_WaitThread();
395 Buffoper(0);
396
397 /* Set replay tracks */
398 Settracks(0,0);
399 Setmontracks(0);
400
401 /* Select replay format */
402 channels_mode=STEREO16;
403 switch (spec->format & 0xff) {
404 case 8:
405 if (spec->channels==2) {
406 channels_mode=STEREO8;
407 } else {
408 channels_mode=MONO8;
409 }
410 break;
411 }
412 if (Setmode(channels_mode)<0) {
413 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
414 }
415
416 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
417 if (MINTAUDIO_frequencies[MINTAUDIO_numfreq].gpio_bits != -1) {
418 Gpio(GPIO_SET,7); /* DSP port gpio outputs */
419 Gpio(GPIO_WRITE, MINTAUDIO_frequencies[MINTAUDIO_numfreq].gpio_bits);
420 Devconnect2(DMAPLAY, DAC|EXTOUT, CLKEXT, prediv);
421 } else {
422 Devconnect2(DMAPLAY, DAC, CLK25M, prediv);
423 }
424
425 /* Set buffer */
426 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
427 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
428 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
429 }
430
431 if (SDL_MintAudio_mint_present) {
432 SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0);
433 } else {
434 /* Install interrupt */
435 Jdisint(MFP_DMASOUND);
436 /*Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);*/
437 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
438 Jenabint(MFP_DMASOUND);
439
440 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
441 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
442 }
443 }
444
445 /* Go */
446 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
447 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
448 }
449
Mint_OpenAudio(_THIS,SDL_AudioSpec * spec)450 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
451 {
452 /* Lock sound system */
453 if (Locksnd()!=1) {
454 SDL_SetError("Mint_OpenAudio: Audio system already in use");
455 return(-1);
456 }
457
458 SDL_MintAudio_device = this;
459
460 /* Check audio capabilities */
461 if (Mint_CheckAudio(this, spec)==-1) {
462 return -1;
463 }
464
465 SDL_CalculateAudioSpec(spec);
466
467 /* Allocate memory for audio buffers in DMA-able RAM */
468 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
469
470 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
471 if (SDL_MintAudio_audiobuf[0]==NULL) {
472 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
473 return (-1);
474 }
475 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
476 SDL_MintAudio_numbuf=0;
477 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
478 SDL_MintAudio_audiosize = spec->size;
479 SDL_MintAudio_mutex = 0;
480
481 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
482 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
483
484 SDL_MintAudio_CheckFpu();
485
486 /* Setup audio hardware */
487 Mint_InitAudio(this, spec);
488
489 return(1); /* We don't use SDL threaded audio */
490 }
491