1 /*
2 * pcm emulation on emu8000 wavetable
3 *
4 * Copyright (C) 2002 Takashi Iwai <tiwai@suse.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include "emu8000_local.h"
22
23 #include <linux/sched/signal.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <sound/initval.h>
27 #include <sound/pcm.h>
28
29 /*
30 * define the following if you want to use this pcm with non-interleaved mode
31 */
32 /* #define USE_NONINTERLEAVE */
33
34 /* NOTE: for using the non-interleaved mode with alsa-lib, you have to set
35 * mmap_emulation flag to 1 in your .asoundrc, such like
36 *
37 * pcm.emu8k {
38 * type plug
39 * slave.pcm {
40 * type hw
41 * card 0
42 * device 1
43 * mmap_emulation 1
44 * }
45 * }
46 *
47 * besides, for the time being, the non-interleaved mode doesn't work well on
48 * alsa-lib...
49 */
50
51
52 struct snd_emu8k_pcm {
53 struct snd_emu8000 *emu;
54 struct snd_pcm_substream *substream;
55
56 unsigned int allocated_bytes;
57 struct snd_util_memblk *block;
58 unsigned int offset;
59 unsigned int buf_size;
60 unsigned int period_size;
61 unsigned int loop_start[2];
62 unsigned int pitch;
63 int panning[2];
64 int last_ptr;
65 int period_pos;
66 int voices;
67 unsigned int dram_opened: 1;
68 unsigned int running: 1;
69 unsigned int timer_running: 1;
70 struct timer_list timer;
71 spinlock_t timer_lock;
72 };
73
74 #define LOOP_BLANK_SIZE 8
75
76
77 /*
78 * open up channels for the simultaneous data transfer and playback
79 */
80 static int
emu8k_open_dram_for_pcm(struct snd_emu8000 * emu,int channels)81 emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels)
82 {
83 int i;
84
85 /* reserve up to 2 voices for playback */
86 snd_emux_lock_voice(emu->emu, 0);
87 if (channels > 1)
88 snd_emux_lock_voice(emu->emu, 1);
89
90 /* reserve 28 voices for loading */
91 for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) {
92 unsigned int mode = EMU8000_RAM_WRITE;
93 snd_emux_lock_voice(emu->emu, i);
94 #ifndef USE_NONINTERLEAVE
95 if (channels > 1 && (i & 1) != 0)
96 mode |= EMU8000_RAM_RIGHT;
97 #endif
98 snd_emu8000_dma_chan(emu, i, mode);
99 }
100
101 /* assign voice 31 and 32 to ROM */
102 EMU8000_VTFT_WRITE(emu, 30, 0);
103 EMU8000_PSST_WRITE(emu, 30, 0x1d8);
104 EMU8000_CSL_WRITE(emu, 30, 0x1e0);
105 EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
106 EMU8000_VTFT_WRITE(emu, 31, 0);
107 EMU8000_PSST_WRITE(emu, 31, 0x1d8);
108 EMU8000_CSL_WRITE(emu, 31, 0x1e0);
109 EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
110
111 return 0;
112 }
113
114 /*
115 */
116 static void
snd_emu8000_write_wait(struct snd_emu8000 * emu,int can_schedule)117 snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule)
118 {
119 while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
120 if (can_schedule) {
121 schedule_timeout_interruptible(1);
122 if (signal_pending(current))
123 break;
124 }
125 }
126 }
127
128 /*
129 * close all channels
130 */
131 static void
emu8k_close_dram(struct snd_emu8000 * emu)132 emu8k_close_dram(struct snd_emu8000 *emu)
133 {
134 int i;
135
136 for (i = 0; i < 2; i++)
137 snd_emux_unlock_voice(emu->emu, i);
138 for (; i < EMU8000_DRAM_VOICES; i++) {
139 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
140 snd_emux_unlock_voice(emu->emu, i);
141 }
142 }
143
144 /*
145 * convert Hz to AWE32 rate offset (see emux/soundfont.c)
146 */
147
148 #define OFFSET_SAMPLERATE 1011119 /* base = 44100 */
149 #define SAMPLERATE_RATIO 4096
150
calc_rate_offset(int hz)151 static int calc_rate_offset(int hz)
152 {
153 return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
154 }
155
156
157 /*
158 */
159
160 static const struct snd_pcm_hardware emu8k_pcm_hw = {
161 #ifdef USE_NONINTERLEAVE
162 .info = SNDRV_PCM_INFO_NONINTERLEAVED,
163 #else
164 .info = SNDRV_PCM_INFO_INTERLEAVED,
165 #endif
166 .formats = SNDRV_PCM_FMTBIT_S16_LE,
167 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
168 .rate_min = 4000,
169 .rate_max = 48000,
170 .channels_min = 1,
171 .channels_max = 2,
172 .buffer_bytes_max = (128*1024),
173 .period_bytes_min = 1024,
174 .period_bytes_max = (128*1024),
175 .periods_min = 2,
176 .periods_max = 1024,
177 .fifo_size = 0,
178
179 };
180
181 /*
182 * get the current position at the given channel from CCCA register
183 */
emu8k_get_curpos(struct snd_emu8k_pcm * rec,int ch)184 static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)
185 {
186 int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;
187 val -= rec->loop_start[ch] - 1;
188 return val;
189 }
190
191
192 /*
193 * timer interrupt handler
194 * check the current position and update the period if necessary.
195 */
emu8k_pcm_timer_func(struct timer_list * t)196 static void emu8k_pcm_timer_func(struct timer_list *t)
197 {
198 struct snd_emu8k_pcm *rec = from_timer(rec, t, timer);
199 int ptr, delta;
200
201 spin_lock(&rec->timer_lock);
202 /* update the current pointer */
203 ptr = emu8k_get_curpos(rec, 0);
204 if (ptr < rec->last_ptr)
205 delta = ptr + rec->buf_size - rec->last_ptr;
206 else
207 delta = ptr - rec->last_ptr;
208 rec->period_pos += delta;
209 rec->last_ptr = ptr;
210
211 /* reprogram timer */
212 mod_timer(&rec->timer, jiffies + 1);
213
214 /* update period */
215 if (rec->period_pos >= (int)rec->period_size) {
216 rec->period_pos %= rec->period_size;
217 spin_unlock(&rec->timer_lock);
218 snd_pcm_period_elapsed(rec->substream);
219 return;
220 }
221 spin_unlock(&rec->timer_lock);
222 }
223
224
225 /*
226 * open pcm
227 * creating an instance here
228 */
emu8k_pcm_open(struct snd_pcm_substream * subs)229 static int emu8k_pcm_open(struct snd_pcm_substream *subs)
230 {
231 struct snd_emu8000 *emu = snd_pcm_substream_chip(subs);
232 struct snd_emu8k_pcm *rec;
233 struct snd_pcm_runtime *runtime = subs->runtime;
234
235 rec = kzalloc(sizeof(*rec), GFP_KERNEL);
236 if (! rec)
237 return -ENOMEM;
238
239 rec->emu = emu;
240 rec->substream = subs;
241 runtime->private_data = rec;
242
243 spin_lock_init(&rec->timer_lock);
244 timer_setup(&rec->timer, emu8k_pcm_timer_func, 0);
245
246 runtime->hw = emu8k_pcm_hw;
247 runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
248 runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
249
250 /* use timer to update periods.. (specified in msec) */
251 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
252 (1000000 + HZ - 1) / HZ, UINT_MAX);
253
254 return 0;
255 }
256
emu8k_pcm_close(struct snd_pcm_substream * subs)257 static int emu8k_pcm_close(struct snd_pcm_substream *subs)
258 {
259 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
260 kfree(rec);
261 subs->runtime->private_data = NULL;
262 return 0;
263 }
264
265 /*
266 * calculate pitch target
267 */
calc_pitch_target(int pitch)268 static int calc_pitch_target(int pitch)
269 {
270 int ptarget = 1 << (pitch >> 12);
271 if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
272 if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
273 if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
274 ptarget += (ptarget >> 1);
275 if (ptarget > 0xffff) ptarget = 0xffff;
276 return ptarget;
277 }
278
279 /*
280 * set up the voice
281 */
setup_voice(struct snd_emu8k_pcm * rec,int ch)282 static void setup_voice(struct snd_emu8k_pcm *rec, int ch)
283 {
284 struct snd_emu8000 *hw = rec->emu;
285 unsigned int temp;
286
287 /* channel to be silent and idle */
288 EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
289 EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
290 EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
291 EMU8000_PTRX_WRITE(hw, ch, 0);
292 EMU8000_CPF_WRITE(hw, ch, 0);
293
294 /* pitch offset */
295 EMU8000_IP_WRITE(hw, ch, rec->pitch);
296 /* set envelope parameters */
297 EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
298 EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
299 EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
300 EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
301 EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
302 /* decay/sustain parameter for volume envelope is used
303 for triggerg the voice */
304 /* modulation envelope heights */
305 EMU8000_PEFE_WRITE(hw, ch, 0x0);
306 /* lfo1/2 delay */
307 EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
308 EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
309 /* lfo1 pitch & cutoff shift */
310 EMU8000_FMMOD_WRITE(hw, ch, 0);
311 /* lfo1 volume & freq */
312 EMU8000_TREMFRQ_WRITE(hw, ch, 0);
313 /* lfo2 pitch & freq */
314 EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
315 /* pan & loop start */
316 temp = rec->panning[ch];
317 temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
318 EMU8000_PSST_WRITE(hw, ch, temp);
319 /* chorus & loop end (chorus 8bit, MSB) */
320 temp = 0; // chorus
321 temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
322 EMU8000_CSL_WRITE(hw, ch, temp);
323 /* Q & current address (Q 4bit value, MSB) */
324 temp = 0; // filterQ
325 temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
326 EMU8000_CCCA_WRITE(hw, ch, temp);
327 /* clear unknown registers */
328 EMU8000_00A0_WRITE(hw, ch, 0);
329 EMU8000_0080_WRITE(hw, ch, 0);
330 }
331
332 /*
333 * trigger the voice
334 */
start_voice(struct snd_emu8k_pcm * rec,int ch)335 static void start_voice(struct snd_emu8k_pcm *rec, int ch)
336 {
337 unsigned long flags;
338 struct snd_emu8000 *hw = rec->emu;
339 unsigned int temp, aux;
340 int pt = calc_pitch_target(rec->pitch);
341
342 /* cutoff and volume */
343 EMU8000_IFATN_WRITE(hw, ch, 0xff00);
344 EMU8000_VTFT_WRITE(hw, ch, 0xffff);
345 EMU8000_CVCF_WRITE(hw, ch, 0xffff);
346 /* trigger envelope */
347 EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
348 /* set reverb and pitch target */
349 temp = 0; // reverb
350 if (rec->panning[ch] == 0)
351 aux = 0xff;
352 else
353 aux = (-rec->panning[ch]) & 0xff;
354 temp = (temp << 8) | (pt << 16) | aux;
355 EMU8000_PTRX_WRITE(hw, ch, temp);
356 EMU8000_CPF_WRITE(hw, ch, pt << 16);
357
358 /* start timer */
359 spin_lock_irqsave(&rec->timer_lock, flags);
360 if (! rec->timer_running) {
361 mod_timer(&rec->timer, jiffies + 1);
362 rec->timer_running = 1;
363 }
364 spin_unlock_irqrestore(&rec->timer_lock, flags);
365 }
366
367 /*
368 * stop the voice immediately
369 */
stop_voice(struct snd_emu8k_pcm * rec,int ch)370 static void stop_voice(struct snd_emu8k_pcm *rec, int ch)
371 {
372 unsigned long flags;
373 struct snd_emu8000 *hw = rec->emu;
374
375 EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
376
377 /* stop timer */
378 spin_lock_irqsave(&rec->timer_lock, flags);
379 if (rec->timer_running) {
380 del_timer(&rec->timer);
381 rec->timer_running = 0;
382 }
383 spin_unlock_irqrestore(&rec->timer_lock, flags);
384 }
385
emu8k_pcm_trigger(struct snd_pcm_substream * subs,int cmd)386 static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
387 {
388 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
389 int ch;
390
391 switch (cmd) {
392 case SNDRV_PCM_TRIGGER_START:
393 for (ch = 0; ch < rec->voices; ch++)
394 start_voice(rec, ch);
395 rec->running = 1;
396 break;
397 case SNDRV_PCM_TRIGGER_STOP:
398 rec->running = 0;
399 for (ch = 0; ch < rec->voices; ch++)
400 stop_voice(rec, ch);
401 break;
402 default:
403 return -EINVAL;
404 }
405 return 0;
406 }
407
408
409 /*
410 * copy / silence ops
411 */
412
413 /*
414 * this macro should be inserted in the copy/silence loops
415 * to reduce the latency. without this, the system will hang up
416 * during the whole loop.
417 */
418 #define CHECK_SCHEDULER() \
419 do { \
420 cond_resched();\
421 if (signal_pending(current))\
422 return -EAGAIN;\
423 } while (0)
424
425 enum {
426 COPY_USER, COPY_KERNEL, FILL_SILENCE,
427 };
428
429 #define GET_VAL(sval, buf, mode) \
430 do { \
431 switch (mode) { \
432 case FILL_SILENCE: \
433 sval = 0; \
434 break; \
435 case COPY_KERNEL: \
436 sval = *buf++; \
437 break; \
438 default: \
439 if (get_user(sval, (unsigned short __user *)buf)) \
440 return -EFAULT; \
441 buf++; \
442 break; \
443 } \
444 } while (0)
445
446 #ifdef USE_NONINTERLEAVE
447
448 #define LOOP_WRITE(rec, offset, _buf, count, mode) \
449 do { \
450 struct snd_emu8000 *emu = (rec)->emu; \
451 unsigned short *buf = (unsigned short *)(_buf); \
452 snd_emu8000_write_wait(emu, 1); \
453 EMU8000_SMALW_WRITE(emu, offset); \
454 while (count > 0) { \
455 unsigned short sval; \
456 CHECK_SCHEDULER(); \
457 GET_VAL(sval, buf, mode); \
458 EMU8000_SMLD_WRITE(emu, sval); \
459 count--; \
460 } \
461 } while (0)
462
463 /* copy one channel block */
emu8k_pcm_copy(struct snd_pcm_substream * subs,int voice,unsigned long pos,void __user * src,unsigned long count)464 static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
465 int voice, unsigned long pos,
466 void __user *src, unsigned long count)
467 {
468 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
469
470 /* convert to word unit */
471 pos = (pos << 1) + rec->loop_start[voice];
472 count <<= 1;
473 LOOP_WRITE(rec, pos, src, count, COPY_USER);
474 return 0;
475 }
476
emu8k_pcm_copy_kernel(struct snd_pcm_substream * subs,int voice,unsigned long pos,void * src,unsigned long count)477 static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
478 int voice, unsigned long pos,
479 void *src, unsigned long count)
480 {
481 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
482
483 /* convert to word unit */
484 pos = (pos << 1) + rec->loop_start[voice];
485 count <<= 1;
486 LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
487 return 0;
488 }
489
490 /* make a channel block silence */
emu8k_pcm_silence(struct snd_pcm_substream * subs,int voice,unsigned long pos,unsigned long count)491 static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
492 int voice, unsigned long pos, unsigned long count)
493 {
494 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
495
496 /* convert to word unit */
497 pos = (pos << 1) + rec->loop_start[voice];
498 count <<= 1;
499 LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
500 return 0;
501 }
502
503 #else /* interleave */
504
505 #define LOOP_WRITE(rec, pos, _buf, count, mode) \
506 do { \
507 struct snd_emu8000 *emu = rec->emu; \
508 unsigned short *buf = (unsigned short *)(_buf); \
509 snd_emu8000_write_wait(emu, 1); \
510 EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]); \
511 if (rec->voices > 1) \
512 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]); \
513 while (count > 0) { \
514 unsigned short sval; \
515 CHECK_SCHEDULER(); \
516 GET_VAL(sval, buf, mode); \
517 EMU8000_SMLD_WRITE(emu, sval); \
518 if (rec->voices > 1) { \
519 CHECK_SCHEDULER(); \
520 GET_VAL(sval, buf, mode); \
521 EMU8000_SMRD_WRITE(emu, sval); \
522 } \
523 count--; \
524 } \
525 } while (0)
526
527
528 /*
529 * copy the interleaved data can be done easily by using
530 * DMA "left" and "right" channels on emu8k engine.
531 */
emu8k_pcm_copy(struct snd_pcm_substream * subs,int voice,unsigned long pos,void __user * src,unsigned long count)532 static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
533 int voice, unsigned long pos,
534 void __user *src, unsigned long count)
535 {
536 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
537
538 /* convert to frames */
539 pos = bytes_to_frames(subs->runtime, pos);
540 count = bytes_to_frames(subs->runtime, count);
541 LOOP_WRITE(rec, pos, src, count, COPY_USER);
542 return 0;
543 }
544
emu8k_pcm_copy_kernel(struct snd_pcm_substream * subs,int voice,unsigned long pos,void * src,unsigned long count)545 static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
546 int voice, unsigned long pos,
547 void *src, unsigned long count)
548 {
549 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
550
551 /* convert to frames */
552 pos = bytes_to_frames(subs->runtime, pos);
553 count = bytes_to_frames(subs->runtime, count);
554 LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
555 return 0;
556 }
557
emu8k_pcm_silence(struct snd_pcm_substream * subs,int voice,unsigned long pos,unsigned long count)558 static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
559 int voice, unsigned long pos, unsigned long count)
560 {
561 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
562
563 /* convert to frames */
564 pos = bytes_to_frames(subs->runtime, pos);
565 count = bytes_to_frames(subs->runtime, count);
566 LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
567 return 0;
568 }
569 #endif
570
571
572 /*
573 * allocate a memory block
574 */
emu8k_pcm_hw_params(struct snd_pcm_substream * subs,struct snd_pcm_hw_params * hw_params)575 static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs,
576 struct snd_pcm_hw_params *hw_params)
577 {
578 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
579
580 if (rec->block) {
581 /* reallocation - release the old block */
582 snd_util_mem_free(rec->emu->memhdr, rec->block);
583 rec->block = NULL;
584 }
585
586 rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;
587 rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);
588 if (! rec->block)
589 return -ENOMEM;
590 rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */
591 /* at least dma_bytes must be set for non-interleaved mode */
592 subs->dma_buffer.bytes = params_buffer_bytes(hw_params);
593
594 return 0;
595 }
596
597 /*
598 * free the memory block
599 */
emu8k_pcm_hw_free(struct snd_pcm_substream * subs)600 static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs)
601 {
602 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
603
604 if (rec->block) {
605 int ch;
606 for (ch = 0; ch < rec->voices; ch++)
607 stop_voice(rec, ch); // to be sure
608 if (rec->dram_opened)
609 emu8k_close_dram(rec->emu);
610 snd_util_mem_free(rec->emu->memhdr, rec->block);
611 rec->block = NULL;
612 }
613 return 0;
614 }
615
616 /*
617 */
emu8k_pcm_prepare(struct snd_pcm_substream * subs)618 static int emu8k_pcm_prepare(struct snd_pcm_substream *subs)
619 {
620 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
621
622 rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);
623 rec->last_ptr = 0;
624 rec->period_pos = 0;
625
626 rec->buf_size = subs->runtime->buffer_size;
627 rec->period_size = subs->runtime->period_size;
628 rec->voices = subs->runtime->channels;
629 rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;
630 if (rec->voices > 1)
631 rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;
632 if (rec->voices > 1) {
633 rec->panning[0] = 0xff;
634 rec->panning[1] = 0x00;
635 } else
636 rec->panning[0] = 0x80;
637
638 if (! rec->dram_opened) {
639 int err, i, ch;
640
641 snd_emux_terminate_all(rec->emu->emu);
642 if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0)
643 return err;
644 rec->dram_opened = 1;
645
646 /* clear loop blanks */
647 snd_emu8000_write_wait(rec->emu, 0);
648 EMU8000_SMALW_WRITE(rec->emu, rec->offset);
649 for (i = 0; i < LOOP_BLANK_SIZE; i++)
650 EMU8000_SMLD_WRITE(rec->emu, 0);
651 for (ch = 0; ch < rec->voices; ch++) {
652 EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);
653 for (i = 0; i < LOOP_BLANK_SIZE; i++)
654 EMU8000_SMLD_WRITE(rec->emu, 0);
655 }
656 }
657
658 setup_voice(rec, 0);
659 if (rec->voices > 1)
660 setup_voice(rec, 1);
661 return 0;
662 }
663
emu8k_pcm_pointer(struct snd_pcm_substream * subs)664 static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs)
665 {
666 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
667 if (rec->running)
668 return emu8k_get_curpos(rec, 0);
669 return 0;
670 }
671
672
673 static const struct snd_pcm_ops emu8k_pcm_ops = {
674 .open = emu8k_pcm_open,
675 .close = emu8k_pcm_close,
676 .ioctl = snd_pcm_lib_ioctl,
677 .hw_params = emu8k_pcm_hw_params,
678 .hw_free = emu8k_pcm_hw_free,
679 .prepare = emu8k_pcm_prepare,
680 .trigger = emu8k_pcm_trigger,
681 .pointer = emu8k_pcm_pointer,
682 .copy_user = emu8k_pcm_copy,
683 .copy_kernel = emu8k_pcm_copy_kernel,
684 .fill_silence = emu8k_pcm_silence,
685 };
686
687
snd_emu8000_pcm_free(struct snd_pcm * pcm)688 static void snd_emu8000_pcm_free(struct snd_pcm *pcm)
689 {
690 struct snd_emu8000 *emu = pcm->private_data;
691 emu->pcm = NULL;
692 }
693
snd_emu8000_pcm_new(struct snd_card * card,struct snd_emu8000 * emu,int index)694 int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index)
695 {
696 struct snd_pcm *pcm;
697 int err;
698
699 if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0)
700 return err;
701 pcm->private_data = emu;
702 pcm->private_free = snd_emu8000_pcm_free;
703 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops);
704 emu->pcm = pcm;
705
706 snd_device_register(card, pcm);
707
708 return 0;
709 }
710
