1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * pcm emulation on emu8000 wavetable |
4 | * |
5 | * Copyright (C) 2002 Takashi Iwai <tiwai@suse.de> |
6 | */ |
7 | |
8 | #include "emu8000_local.h" |
9 | |
10 | #include <linux/sched/signal.h> |
11 | #include <linux/init.h> |
12 | #include <linux/slab.h> |
13 | #include <sound/initval.h> |
14 | #include <sound/pcm.h> |
15 | |
16 | /* |
17 | * define the following if you want to use this pcm with non-interleaved mode |
18 | */ |
19 | /* #define USE_NONINTERLEAVE */ |
20 | |
21 | /* NOTE: for using the non-interleaved mode with alsa-lib, you have to set |
22 | * mmap_emulation flag to 1 in your .asoundrc, such like |
23 | * |
24 | * pcm.emu8k { |
25 | * type plug |
26 | * slave.pcm { |
27 | * type hw |
28 | * card 0 |
29 | * device 1 |
30 | * mmap_emulation 1 |
31 | * } |
32 | * } |
33 | * |
34 | * besides, for the time being, the non-interleaved mode doesn't work well on |
35 | * alsa-lib... |
36 | */ |
37 | |
38 | |
39 | struct snd_emu8k_pcm { |
40 | struct snd_emu8000 *emu; |
41 | struct snd_pcm_substream *substream; |
42 | |
43 | unsigned int allocated_bytes; |
44 | struct snd_util_memblk *block; |
45 | unsigned int offset; |
46 | unsigned int buf_size; |
47 | unsigned int period_size; |
48 | unsigned int loop_start[2]; |
49 | unsigned int pitch; |
50 | int panning[2]; |
51 | int last_ptr; |
52 | int period_pos; |
53 | int voices; |
54 | unsigned int dram_opened: 1; |
55 | unsigned int running: 1; |
56 | unsigned int timer_running: 1; |
57 | struct timer_list timer; |
58 | spinlock_t timer_lock; |
59 | }; |
60 | |
61 | #define LOOP_BLANK_SIZE 8 |
62 | |
63 | |
64 | /* |
65 | * open up channels for the simultaneous data transfer and playback |
66 | */ |
67 | static int |
68 | emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels) |
69 | { |
70 | int i; |
71 | |
72 | /* reserve up to 2 voices for playback */ |
73 | snd_emux_lock_voice(emu: emu->emu, voice: 0); |
74 | if (channels > 1) |
75 | snd_emux_lock_voice(emu: emu->emu, voice: 1); |
76 | |
77 | /* reserve 28 voices for loading */ |
78 | for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) { |
79 | unsigned int mode = EMU8000_RAM_WRITE; |
80 | snd_emux_lock_voice(emu: emu->emu, voice: i); |
81 | #ifndef USE_NONINTERLEAVE |
82 | if (channels > 1 && (i & 1) != 0) |
83 | mode |= EMU8000_RAM_RIGHT; |
84 | #endif |
85 | snd_emu8000_dma_chan(emu, ch: i, mode); |
86 | } |
87 | |
88 | /* assign voice 31 and 32 to ROM */ |
89 | EMU8000_VTFT_WRITE(emu, 30, 0); |
90 | EMU8000_PSST_WRITE(emu, 30, 0x1d8); |
91 | EMU8000_CSL_WRITE(emu, 30, 0x1e0); |
92 | EMU8000_CCCA_WRITE(emu, 30, 0x1d8); |
93 | EMU8000_VTFT_WRITE(emu, 31, 0); |
94 | EMU8000_PSST_WRITE(emu, 31, 0x1d8); |
95 | EMU8000_CSL_WRITE(emu, 31, 0x1e0); |
96 | EMU8000_CCCA_WRITE(emu, 31, 0x1d8); |
97 | |
98 | return 0; |
99 | } |
100 | |
101 | /* |
102 | */ |
103 | static void |
104 | snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule) |
105 | { |
106 | while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) { |
107 | if (can_schedule) { |
108 | schedule_timeout_interruptible(timeout: 1); |
109 | if (signal_pending(current)) |
110 | break; |
111 | } |
112 | } |
113 | } |
114 | |
115 | /* |
116 | * close all channels |
117 | */ |
118 | static void |
119 | emu8k_close_dram(struct snd_emu8000 *emu) |
120 | { |
121 | int i; |
122 | |
123 | for (i = 0; i < 2; i++) |
124 | snd_emux_unlock_voice(emu: emu->emu, voice: i); |
125 | for (; i < EMU8000_DRAM_VOICES; i++) { |
126 | snd_emu8000_dma_chan(emu, ch: i, EMU8000_RAM_CLOSE); |
127 | snd_emux_unlock_voice(emu: emu->emu, voice: i); |
128 | } |
129 | } |
130 | |
131 | /* |
132 | * convert Hz to AWE32 rate offset (see emux/soundfont.c) |
133 | */ |
134 | |
135 | #define OFFSET_SAMPLERATE 1011119 /* base = 44100 */ |
136 | #define SAMPLERATE_RATIO 4096 |
137 | |
138 | static int calc_rate_offset(int hz) |
139 | { |
140 | return snd_sf_linear_to_log(amount: hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO); |
141 | } |
142 | |
143 | |
144 | /* |
145 | */ |
146 | |
147 | static const struct snd_pcm_hardware emu8k_pcm_hw = { |
148 | #ifdef USE_NONINTERLEAVE |
149 | .info = SNDRV_PCM_INFO_NONINTERLEAVED, |
150 | #else |
151 | .info = SNDRV_PCM_INFO_INTERLEAVED, |
152 | #endif |
153 | .formats = SNDRV_PCM_FMTBIT_S16_LE, |
154 | .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000, |
155 | .rate_min = 4000, |
156 | .rate_max = 48000, |
157 | .channels_min = 1, |
158 | .channels_max = 2, |
159 | .buffer_bytes_max = (128*1024), |
160 | .period_bytes_min = 1024, |
161 | .period_bytes_max = (128*1024), |
162 | .periods_min = 2, |
163 | .periods_max = 1024, |
164 | .fifo_size = 0, |
165 | |
166 | }; |
167 | |
168 | /* |
169 | * get the current position at the given channel from CCCA register |
170 | */ |
171 | static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch) |
172 | { |
173 | int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff; |
174 | val -= rec->loop_start[ch] - 1; |
175 | return val; |
176 | } |
177 | |
178 | |
179 | /* |
180 | * timer interrupt handler |
181 | * check the current position and update the period if necessary. |
182 | */ |
183 | static void emu8k_pcm_timer_func(struct timer_list *t) |
184 | { |
185 | struct snd_emu8k_pcm *rec = from_timer(rec, t, timer); |
186 | int ptr, delta; |
187 | |
188 | spin_lock(lock: &rec->timer_lock); |
189 | /* update the current pointer */ |
190 | ptr = emu8k_get_curpos(rec, ch: 0); |
191 | if (ptr < rec->last_ptr) |
192 | delta = ptr + rec->buf_size - rec->last_ptr; |
193 | else |
194 | delta = ptr - rec->last_ptr; |
195 | rec->period_pos += delta; |
196 | rec->last_ptr = ptr; |
197 | |
198 | /* reprogram timer */ |
199 | mod_timer(timer: &rec->timer, expires: jiffies + 1); |
200 | |
201 | /* update period */ |
202 | if (rec->period_pos >= (int)rec->period_size) { |
203 | rec->period_pos %= rec->period_size; |
204 | spin_unlock(lock: &rec->timer_lock); |
205 | snd_pcm_period_elapsed(substream: rec->substream); |
206 | return; |
207 | } |
208 | spin_unlock(lock: &rec->timer_lock); |
209 | } |
210 | |
211 | |
212 | /* |
213 | * open pcm |
214 | * creating an instance here |
215 | */ |
216 | static int emu8k_pcm_open(struct snd_pcm_substream *subs) |
217 | { |
218 | struct snd_emu8000 *emu = snd_pcm_substream_chip(subs); |
219 | struct snd_emu8k_pcm *rec; |
220 | struct snd_pcm_runtime *runtime = subs->runtime; |
221 | |
222 | rec = kzalloc(size: sizeof(*rec), GFP_KERNEL); |
223 | if (! rec) |
224 | return -ENOMEM; |
225 | |
226 | rec->emu = emu; |
227 | rec->substream = subs; |
228 | runtime->private_data = rec; |
229 | |
230 | spin_lock_init(&rec->timer_lock); |
231 | timer_setup(&rec->timer, emu8k_pcm_timer_func, 0); |
232 | |
233 | runtime->hw = emu8k_pcm_hw; |
234 | runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3; |
235 | runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2; |
236 | |
237 | /* use timer to update periods.. (specified in msec) */ |
238 | snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, |
239 | DIV_ROUND_UP(1000000, HZ), UINT_MAX); |
240 | |
241 | return 0; |
242 | } |
243 | |
244 | static int emu8k_pcm_close(struct snd_pcm_substream *subs) |
245 | { |
246 | struct snd_emu8k_pcm *rec = subs->runtime->private_data; |
247 | kfree(objp: rec); |
248 | subs->runtime->private_data = NULL; |
249 | return 0; |
250 | } |
251 | |
252 | /* |
253 | * calculate pitch target |
254 | */ |
255 | static int calc_pitch_target(int pitch) |
256 | { |
257 | int ptarget = 1 << (pitch >> 12); |
258 | if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710; |
259 | if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710; |
260 | if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710; |
261 | ptarget += (ptarget >> 1); |
262 | if (ptarget > 0xffff) ptarget = 0xffff; |
263 | return ptarget; |
264 | } |
265 | |
266 | /* |
267 | * set up the voice |
268 | */ |
269 | static void setup_voice(struct snd_emu8k_pcm *rec, int ch) |
270 | { |
271 | struct snd_emu8000 *hw = rec->emu; |
272 | unsigned int temp; |
273 | |
274 | /* channel to be silent and idle */ |
275 | EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080); |
276 | EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF); |
277 | EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF); |
278 | EMU8000_PTRX_WRITE(hw, ch, 0); |
279 | EMU8000_CPF_WRITE(hw, ch, 0); |
280 | |
281 | /* pitch offset */ |
282 | EMU8000_IP_WRITE(hw, ch, rec->pitch); |
283 | /* set envelope parameters */ |
284 | EMU8000_ENVVAL_WRITE(hw, ch, 0x8000); |
285 | EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f); |
286 | EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f); |
287 | EMU8000_ENVVOL_WRITE(hw, ch, 0x8000); |
288 | EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f); |
289 | /* decay/sustain parameter for volume envelope is used |
290 | for triggerg the voice */ |
291 | /* modulation envelope heights */ |
292 | EMU8000_PEFE_WRITE(hw, ch, 0x0); |
293 | /* lfo1/2 delay */ |
294 | EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000); |
295 | EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000); |
296 | /* lfo1 pitch & cutoff shift */ |
297 | EMU8000_FMMOD_WRITE(hw, ch, 0); |
298 | /* lfo1 volume & freq */ |
299 | EMU8000_TREMFRQ_WRITE(hw, ch, 0); |
300 | /* lfo2 pitch & freq */ |
301 | EMU8000_FM2FRQ2_WRITE(hw, ch, 0); |
302 | /* pan & loop start */ |
303 | temp = rec->panning[ch]; |
304 | temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1); |
305 | EMU8000_PSST_WRITE(hw, ch, temp); |
306 | /* chorus & loop end (chorus 8bit, MSB) */ |
307 | temp = 0; // chorus |
308 | temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1); |
309 | EMU8000_CSL_WRITE(hw, ch, temp); |
310 | /* Q & current address (Q 4bit value, MSB) */ |
311 | temp = 0; // filterQ |
312 | temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1); |
313 | EMU8000_CCCA_WRITE(hw, ch, temp); |
314 | /* clear unknown registers */ |
315 | EMU8000_00A0_WRITE(hw, ch, 0); |
316 | EMU8000_0080_WRITE(hw, ch, 0); |
317 | } |
318 | |
319 | /* |
320 | * trigger the voice |
321 | */ |
322 | static void start_voice(struct snd_emu8k_pcm *rec, int ch) |
323 | { |
324 | unsigned long flags; |
325 | struct snd_emu8000 *hw = rec->emu; |
326 | unsigned int temp, aux; |
327 | int pt = calc_pitch_target(pitch: rec->pitch); |
328 | |
329 | /* cutoff and volume */ |
330 | EMU8000_IFATN_WRITE(hw, ch, 0xff00); |
331 | EMU8000_VTFT_WRITE(hw, ch, 0xffff); |
332 | EMU8000_CVCF_WRITE(hw, ch, 0xffff); |
333 | /* trigger envelope */ |
334 | EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f); |
335 | /* set reverb and pitch target */ |
336 | temp = 0; // reverb |
337 | if (rec->panning[ch] == 0) |
338 | aux = 0xff; |
339 | else |
340 | aux = (-rec->panning[ch]) & 0xff; |
341 | temp = (temp << 8) | (pt << 16) | aux; |
342 | EMU8000_PTRX_WRITE(hw, ch, temp); |
343 | EMU8000_CPF_WRITE(hw, ch, pt << 16); |
344 | |
345 | /* start timer */ |
346 | spin_lock_irqsave(&rec->timer_lock, flags); |
347 | if (! rec->timer_running) { |
348 | mod_timer(timer: &rec->timer, expires: jiffies + 1); |
349 | rec->timer_running = 1; |
350 | } |
351 | spin_unlock_irqrestore(lock: &rec->timer_lock, flags); |
352 | } |
353 | |
354 | /* |
355 | * stop the voice immediately |
356 | */ |
357 | static void stop_voice(struct snd_emu8k_pcm *rec, int ch) |
358 | { |
359 | unsigned long flags; |
360 | struct snd_emu8000 *hw = rec->emu; |
361 | |
362 | EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F); |
363 | |
364 | /* stop timer */ |
365 | spin_lock_irqsave(&rec->timer_lock, flags); |
366 | if (rec->timer_running) { |
367 | del_timer(timer: &rec->timer); |
368 | rec->timer_running = 0; |
369 | } |
370 | spin_unlock_irqrestore(lock: &rec->timer_lock, flags); |
371 | } |
372 | |
373 | static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd) |
374 | { |
375 | struct snd_emu8k_pcm *rec = subs->runtime->private_data; |
376 | int ch; |
377 | |
378 | switch (cmd) { |
379 | case SNDRV_PCM_TRIGGER_START: |
380 | for (ch = 0; ch < rec->voices; ch++) |
381 | start_voice(rec, ch); |
382 | rec->running = 1; |
383 | break; |
384 | case SNDRV_PCM_TRIGGER_STOP: |
385 | rec->running = 0; |
386 | for (ch = 0; ch < rec->voices; ch++) |
387 | stop_voice(rec, ch); |
388 | break; |
389 | default: |
390 | return -EINVAL; |
391 | } |
392 | return 0; |
393 | } |
394 | |
395 | |
396 | /* |
397 | * copy / silence ops |
398 | */ |
399 | |
400 | /* |
401 | * this macro should be inserted in the copy/silence loops |
402 | * to reduce the latency. without this, the system will hang up |
403 | * during the whole loop. |
404 | */ |
405 | #define CHECK_SCHEDULER() \ |
406 | do { \ |
407 | cond_resched();\ |
408 | if (signal_pending(current))\ |
409 | return -EAGAIN;\ |
410 | } while (0) |
411 | |
412 | #define GET_VAL(sval, iter) \ |
413 | do { \ |
414 | if (!iter) \ |
415 | sval = 0; \ |
416 | else if (copy_from_iter(&sval, 2, iter) != 2) \ |
417 | return -EFAULT; \ |
418 | } while (0) |
419 | |
420 | #ifdef USE_NONINTERLEAVE |
421 | |
422 | #define LOOP_WRITE(rec, offset, iter, count) \ |
423 | do { \ |
424 | struct snd_emu8000 *emu = (rec)->emu; \ |
425 | snd_emu8000_write_wait(emu, 1); \ |
426 | EMU8000_SMALW_WRITE(emu, offset); \ |
427 | while (count > 0) { \ |
428 | unsigned short sval; \ |
429 | CHECK_SCHEDULER(); \ |
430 | GET_VAL(sval, iter); \ |
431 | EMU8000_SMLD_WRITE(emu, sval); \ |
432 | count--; \ |
433 | } \ |
434 | } while (0) |
435 | |
436 | /* copy one channel block */ |
437 | static int emu8k_pcm_copy(struct snd_pcm_substream *subs, |
438 | int voice, unsigned long pos, |
439 | struct iov_iter *src, unsigned long count) |
440 | { |
441 | struct snd_emu8k_pcm *rec = subs->runtime->private_data; |
442 | |
443 | /* convert to word unit */ |
444 | pos = (pos << 1) + rec->loop_start[voice]; |
445 | count <<= 1; |
446 | LOOP_WRITE(rec, pos, src, count); |
447 | return 0; |
448 | } |
449 | |
450 | /* make a channel block silence */ |
451 | static int emu8k_pcm_silence(struct snd_pcm_substream *subs, |
452 | int voice, unsigned long pos, unsigned long count) |
453 | { |
454 | struct snd_emu8k_pcm *rec = subs->runtime->private_data; |
455 | |
456 | /* convert to word unit */ |
457 | pos = (pos << 1) + rec->loop_start[voice]; |
458 | count <<= 1; |
459 | LOOP_WRITE(rec, pos, NULL, count); |
460 | return 0; |
461 | } |
462 | |
463 | #else /* interleave */ |
464 | |
465 | #define LOOP_WRITE(rec, pos, iter, count) \ |
466 | do { \ |
467 | struct snd_emu8000 *emu = rec->emu; \ |
468 | snd_emu8000_write_wait(emu, 1); \ |
469 | EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]); \ |
470 | if (rec->voices > 1) \ |
471 | EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]); \ |
472 | while (count > 0) { \ |
473 | unsigned short sval; \ |
474 | CHECK_SCHEDULER(); \ |
475 | GET_VAL(sval, iter); \ |
476 | EMU8000_SMLD_WRITE(emu, sval); \ |
477 | if (rec->voices > 1) { \ |
478 | CHECK_SCHEDULER(); \ |
479 | GET_VAL(sval, iter); \ |
480 | EMU8000_SMRD_WRITE(emu, sval); \ |
481 | } \ |
482 | count--; \ |
483 | } \ |
484 | } while (0) |
485 | |
486 | |
487 | /* |
488 | * copy the interleaved data can be done easily by using |
489 | * DMA "left" and "right" channels on emu8k engine. |
490 | */ |
491 | static int emu8k_pcm_copy(struct snd_pcm_substream *subs, |
492 | int voice, unsigned long pos, |
493 | struct iov_iter *src, unsigned long count) |
494 | { |
495 | struct snd_emu8k_pcm *rec = subs->runtime->private_data; |
496 | |
497 | /* convert to frames */ |
498 | pos = bytes_to_frames(runtime: subs->runtime, size: pos); |
499 | count = bytes_to_frames(runtime: subs->runtime, size: count); |
500 | LOOP_WRITE(rec, pos, src, count); |
501 | return 0; |
502 | } |
503 | |
504 | static int emu8k_pcm_silence(struct snd_pcm_substream *subs, |
505 | int voice, unsigned long pos, unsigned long count) |
506 | { |
507 | struct snd_emu8k_pcm *rec = subs->runtime->private_data; |
508 | |
509 | /* convert to frames */ |
510 | pos = bytes_to_frames(runtime: subs->runtime, size: pos); |
511 | count = bytes_to_frames(runtime: subs->runtime, size: count); |
512 | LOOP_WRITE(rec, pos, NULL, count); |
513 | return 0; |
514 | } |
515 | #endif |
516 | |
517 | |
518 | /* |
519 | * allocate a memory block |
520 | */ |
521 | static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs, |
522 | struct snd_pcm_hw_params *hw_params) |
523 | { |
524 | struct snd_emu8k_pcm *rec = subs->runtime->private_data; |
525 | |
526 | if (rec->block) { |
527 | /* reallocation - release the old block */ |
528 | snd_util_mem_free(hdr: rec->emu->memhdr, blk: rec->block); |
529 | rec->block = NULL; |
530 | } |
531 | |
532 | rec->allocated_bytes = params_buffer_bytes(p: hw_params) + LOOP_BLANK_SIZE * 4; |
533 | rec->block = snd_util_mem_alloc(hdr: rec->emu->memhdr, size: rec->allocated_bytes); |
534 | if (! rec->block) |
535 | return -ENOMEM; |
536 | rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */ |
537 | /* at least dma_bytes must be set for non-interleaved mode */ |
538 | subs->dma_buffer.bytes = params_buffer_bytes(p: hw_params); |
539 | |
540 | return 0; |
541 | } |
542 | |
543 | /* |
544 | * free the memory block |
545 | */ |
546 | static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs) |
547 | { |
548 | struct snd_emu8k_pcm *rec = subs->runtime->private_data; |
549 | |
550 | if (rec->block) { |
551 | int ch; |
552 | for (ch = 0; ch < rec->voices; ch++) |
553 | stop_voice(rec, ch); // to be sure |
554 | if (rec->dram_opened) |
555 | emu8k_close_dram(emu: rec->emu); |
556 | snd_util_mem_free(hdr: rec->emu->memhdr, blk: rec->block); |
557 | rec->block = NULL; |
558 | } |
559 | return 0; |
560 | } |
561 | |
562 | /* |
563 | */ |
564 | static int emu8k_pcm_prepare(struct snd_pcm_substream *subs) |
565 | { |
566 | struct snd_emu8k_pcm *rec = subs->runtime->private_data; |
567 | |
568 | rec->pitch = 0xe000 + calc_rate_offset(hz: subs->runtime->rate); |
569 | rec->last_ptr = 0; |
570 | rec->period_pos = 0; |
571 | |
572 | rec->buf_size = subs->runtime->buffer_size; |
573 | rec->period_size = subs->runtime->period_size; |
574 | rec->voices = subs->runtime->channels; |
575 | rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE; |
576 | if (rec->voices > 1) |
577 | rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE; |
578 | if (rec->voices > 1) { |
579 | rec->panning[0] = 0xff; |
580 | rec->panning[1] = 0x00; |
581 | } else |
582 | rec->panning[0] = 0x80; |
583 | |
584 | if (! rec->dram_opened) { |
585 | int err, i, ch; |
586 | |
587 | snd_emux_terminate_all(emu: rec->emu->emu); |
588 | err = emu8k_open_dram_for_pcm(emu: rec->emu, channels: rec->voices); |
589 | if (err) |
590 | return err; |
591 | rec->dram_opened = 1; |
592 | |
593 | /* clear loop blanks */ |
594 | snd_emu8000_write_wait(emu: rec->emu, can_schedule: 0); |
595 | EMU8000_SMALW_WRITE(rec->emu, rec->offset); |
596 | for (i = 0; i < LOOP_BLANK_SIZE; i++) |
597 | EMU8000_SMLD_WRITE(rec->emu, 0); |
598 | for (ch = 0; ch < rec->voices; ch++) { |
599 | EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size); |
600 | for (i = 0; i < LOOP_BLANK_SIZE; i++) |
601 | EMU8000_SMLD_WRITE(rec->emu, 0); |
602 | } |
603 | } |
604 | |
605 | setup_voice(rec, ch: 0); |
606 | if (rec->voices > 1) |
607 | setup_voice(rec, ch: 1); |
608 | return 0; |
609 | } |
610 | |
611 | static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs) |
612 | { |
613 | struct snd_emu8k_pcm *rec = subs->runtime->private_data; |
614 | if (rec->running) |
615 | return emu8k_get_curpos(rec, ch: 0); |
616 | return 0; |
617 | } |
618 | |
619 | |
620 | static const struct snd_pcm_ops emu8k_pcm_ops = { |
621 | .open = emu8k_pcm_open, |
622 | .close = emu8k_pcm_close, |
623 | .hw_params = emu8k_pcm_hw_params, |
624 | .hw_free = emu8k_pcm_hw_free, |
625 | .prepare = emu8k_pcm_prepare, |
626 | .trigger = emu8k_pcm_trigger, |
627 | .pointer = emu8k_pcm_pointer, |
628 | .copy = emu8k_pcm_copy, |
629 | .fill_silence = emu8k_pcm_silence, |
630 | }; |
631 | |
632 | |
633 | static void snd_emu8000_pcm_free(struct snd_pcm *pcm) |
634 | { |
635 | struct snd_emu8000 *emu = pcm->private_data; |
636 | emu->pcm = NULL; |
637 | } |
638 | |
639 | int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index) |
640 | { |
641 | struct snd_pcm *pcm; |
642 | int err; |
643 | |
644 | err = snd_pcm_new(card, id: "Emu8000 PCM" , device: index, playback_count: 1, capture_count: 0, rpcm: &pcm); |
645 | if (err < 0) |
646 | return err; |
647 | pcm->private_data = emu; |
648 | pcm->private_free = snd_emu8000_pcm_free; |
649 | snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_PLAYBACK, ops: &emu8k_pcm_ops); |
650 | emu->pcm = pcm; |
651 | |
652 | snd_device_register(card, device_data: pcm); |
653 | |
654 | return 0; |
655 | } |
656 | |