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1da177e4 LT |
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 | #include <linux/init.h> | |
23 | #include <sound/initval.h> | |
24 | #include <sound/pcm.h> | |
25 | ||
26 | /* | |
27 | * define the following if you want to use this pcm with non-interleaved mode | |
28 | */ | |
29 | /* #define USE_NONINTERLEAVE */ | |
30 | ||
31 | /* NOTE: for using the non-interleaved mode with alsa-lib, you have to set | |
32 | * mmap_emulation flag to 1 in your .asoundrc, such like | |
33 | * | |
34 | * pcm.emu8k { | |
35 | * type plug | |
36 | * slave.pcm { | |
37 | * type hw | |
38 | * card 0 | |
39 | * device 1 | |
40 | * mmap_emulation 1 | |
41 | * } | |
42 | * } | |
43 | * | |
44 | * besides, for the time being, the non-interleaved mode doesn't work well on | |
45 | * alsa-lib... | |
46 | */ | |
47 | ||
48 | ||
49 | typedef struct snd_emu8k_pcm emu8k_pcm_t; | |
50 | ||
51 | struct snd_emu8k_pcm { | |
52 | emu8000_t *emu; | |
53 | snd_pcm_substream_t *substream; | |
54 | ||
55 | unsigned int allocated_bytes; | |
56 | snd_util_memblk_t *block; | |
57 | unsigned int offset; | |
58 | unsigned int buf_size; | |
59 | unsigned int period_size; | |
60 | unsigned int loop_start[2]; | |
61 | unsigned int pitch; | |
62 | int panning[2]; | |
63 | int last_ptr; | |
64 | int period_pos; | |
65 | int voices; | |
66 | unsigned int dram_opened: 1; | |
67 | unsigned int running: 1; | |
68 | unsigned int timer_running: 1; | |
69 | struct timer_list timer; | |
70 | spinlock_t timer_lock; | |
71 | }; | |
72 | ||
73 | #define LOOP_BLANK_SIZE 8 | |
74 | ||
75 | ||
76 | /* | |
77 | * open up channels for the simultaneous data transfer and playback | |
78 | */ | |
79 | static int | |
80 | emu8k_open_dram_for_pcm(emu8000_t *emu, int channels) | |
81 | { | |
82 | int i; | |
83 | ||
84 | /* reserve up to 2 voices for playback */ | |
85 | snd_emux_lock_voice(emu->emu, 0); | |
86 | if (channels > 1) | |
87 | snd_emux_lock_voice(emu->emu, 1); | |
88 | ||
89 | /* reserve 28 voices for loading */ | |
90 | for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) { | |
91 | unsigned int mode = EMU8000_RAM_WRITE; | |
92 | snd_emux_lock_voice(emu->emu, i); | |
93 | #ifndef USE_NONINTERLEAVE | |
94 | if (channels > 1 && (i & 1) != 0) | |
95 | mode |= EMU8000_RAM_RIGHT; | |
96 | #endif | |
97 | snd_emu8000_dma_chan(emu, i, mode); | |
98 | } | |
99 | ||
100 | /* assign voice 31 and 32 to ROM */ | |
101 | EMU8000_VTFT_WRITE(emu, 30, 0); | |
102 | EMU8000_PSST_WRITE(emu, 30, 0x1d8); | |
103 | EMU8000_CSL_WRITE(emu, 30, 0x1e0); | |
104 | EMU8000_CCCA_WRITE(emu, 30, 0x1d8); | |
105 | EMU8000_VTFT_WRITE(emu, 31, 0); | |
106 | EMU8000_PSST_WRITE(emu, 31, 0x1d8); | |
107 | EMU8000_CSL_WRITE(emu, 31, 0x1e0); | |
108 | EMU8000_CCCA_WRITE(emu, 31, 0x1d8); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | /* | |
114 | */ | |
115 | static void | |
116 | snd_emu8000_write_wait(emu8000_t *emu, int can_schedule) | |
117 | { | |
118 | while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) { | |
119 | if (can_schedule) { | |
120 | set_current_state(TASK_INTERRUPTIBLE); | |
121 | schedule_timeout(1); | |
122 | if (signal_pending(current)) | |
123 | break; | |
124 | } | |
125 | } | |
126 | } | |
127 | ||
128 | /* | |
129 | * close all channels | |
130 | */ | |
131 | static void | |
132 | emu8k_close_dram(emu8000_t *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 | ||
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 snd_pcm_hardware_t 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 | */ | |
184 | static inline int emu8k_get_curpos(emu8k_pcm_t *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 | */ | |
196 | static void emu8k_pcm_timer_func(unsigned long data) | |
197 | { | |
198 | emu8k_pcm_t *rec = (emu8k_pcm_t *)data; | |
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 | rec->timer.expires = jiffies + 1; | |
213 | add_timer(&rec->timer); | |
214 | ||
215 | /* update period */ | |
216 | if (rec->period_pos >= (int)rec->period_size) { | |
217 | rec->period_pos %= rec->period_size; | |
218 | spin_unlock(&rec->timer_lock); | |
219 | snd_pcm_period_elapsed(rec->substream); | |
220 | return; | |
221 | } | |
222 | spin_unlock(&rec->timer_lock); | |
223 | } | |
224 | ||
225 | ||
226 | /* | |
227 | * open pcm | |
228 | * creating an instance here | |
229 | */ | |
230 | static int emu8k_pcm_open(snd_pcm_substream_t *subs) | |
231 | { | |
232 | emu8000_t *emu = snd_pcm_substream_chip(subs); | |
233 | emu8k_pcm_t *rec; | |
234 | snd_pcm_runtime_t *runtime = subs->runtime; | |
235 | ||
9e76a76e | 236 | rec = kzalloc(sizeof(*rec), GFP_KERNEL); |
1da177e4 LT |
237 | if (! rec) |
238 | return -ENOMEM; | |
239 | ||
240 | rec->emu = emu; | |
241 | rec->substream = subs; | |
242 | runtime->private_data = rec; | |
243 | ||
244 | spin_lock_init(&rec->timer_lock); | |
245 | init_timer(&rec->timer); | |
246 | rec->timer.function = emu8k_pcm_timer_func; | |
247 | rec->timer.data = (unsigned long)rec; | |
248 | ||
249 | runtime->hw = emu8k_pcm_hw; | |
250 | runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3; | |
251 | runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2; | |
252 | ||
253 | /* use timer to update periods.. (specified in msec) */ | |
254 | snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
255 | (1000000 + HZ - 1) / HZ, UINT_MAX); | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | static int emu8k_pcm_close(snd_pcm_substream_t *subs) | |
261 | { | |
262 | emu8k_pcm_t *rec = subs->runtime->private_data; | |
263 | kfree(rec); | |
264 | subs->runtime->private_data = NULL; | |
265 | return 0; | |
266 | } | |
267 | ||
268 | /* | |
269 | * calculate pitch target | |
270 | */ | |
271 | static int calc_pitch_target(int pitch) | |
272 | { | |
273 | int ptarget = 1 << (pitch >> 12); | |
274 | if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710; | |
275 | if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710; | |
276 | if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710; | |
277 | ptarget += (ptarget >> 1); | |
278 | if (ptarget > 0xffff) ptarget = 0xffff; | |
279 | return ptarget; | |
280 | } | |
281 | ||
282 | /* | |
283 | * set up the voice | |
284 | */ | |
285 | static void setup_voice(emu8k_pcm_t *rec, int ch) | |
286 | { | |
287 | emu8000_t *hw = rec->emu; | |
288 | unsigned int temp; | |
289 | ||
290 | /* channel to be silent and idle */ | |
291 | EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080); | |
292 | EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF); | |
293 | EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF); | |
294 | EMU8000_PTRX_WRITE(hw, ch, 0); | |
295 | EMU8000_CPF_WRITE(hw, ch, 0); | |
296 | ||
297 | /* pitch offset */ | |
298 | EMU8000_IP_WRITE(hw, ch, rec->pitch); | |
299 | /* set envelope parameters */ | |
300 | EMU8000_ENVVAL_WRITE(hw, ch, 0x8000); | |
301 | EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f); | |
302 | EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f); | |
303 | EMU8000_ENVVOL_WRITE(hw, ch, 0x8000); | |
304 | EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f); | |
305 | /* decay/sustain parameter for volume envelope is used | |
306 | for triggerg the voice */ | |
307 | /* modulation envelope heights */ | |
308 | EMU8000_PEFE_WRITE(hw, ch, 0x0); | |
309 | /* lfo1/2 delay */ | |
310 | EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000); | |
311 | EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000); | |
312 | /* lfo1 pitch & cutoff shift */ | |
313 | EMU8000_FMMOD_WRITE(hw, ch, 0); | |
314 | /* lfo1 volume & freq */ | |
315 | EMU8000_TREMFRQ_WRITE(hw, ch, 0); | |
316 | /* lfo2 pitch & freq */ | |
317 | EMU8000_FM2FRQ2_WRITE(hw, ch, 0); | |
318 | /* pan & loop start */ | |
319 | temp = rec->panning[ch]; | |
320 | temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1); | |
321 | EMU8000_PSST_WRITE(hw, ch, temp); | |
322 | /* chorus & loop end (chorus 8bit, MSB) */ | |
323 | temp = 0; // chorus | |
324 | temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1); | |
325 | EMU8000_CSL_WRITE(hw, ch, temp); | |
326 | /* Q & current address (Q 4bit value, MSB) */ | |
327 | temp = 0; // filterQ | |
328 | temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1); | |
329 | EMU8000_CCCA_WRITE(hw, ch, temp); | |
330 | /* clear unknown registers */ | |
331 | EMU8000_00A0_WRITE(hw, ch, 0); | |
332 | EMU8000_0080_WRITE(hw, ch, 0); | |
333 | } | |
334 | ||
335 | /* | |
336 | * trigger the voice | |
337 | */ | |
338 | static void start_voice(emu8k_pcm_t *rec, int ch) | |
339 | { | |
340 | unsigned long flags; | |
341 | emu8000_t *hw = rec->emu; | |
342 | unsigned int temp, aux; | |
343 | int pt = calc_pitch_target(rec->pitch); | |
344 | ||
345 | /* cutoff and volume */ | |
346 | EMU8000_IFATN_WRITE(hw, ch, 0xff00); | |
347 | EMU8000_VTFT_WRITE(hw, ch, 0xffff); | |
348 | EMU8000_CVCF_WRITE(hw, ch, 0xffff); | |
349 | /* trigger envelope */ | |
350 | EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f); | |
351 | /* set reverb and pitch target */ | |
352 | temp = 0; // reverb | |
353 | if (rec->panning[ch] == 0) | |
354 | aux = 0xff; | |
355 | else | |
356 | aux = (-rec->panning[ch]) & 0xff; | |
357 | temp = (temp << 8) | (pt << 16) | aux; | |
358 | EMU8000_PTRX_WRITE(hw, ch, temp); | |
359 | EMU8000_CPF_WRITE(hw, ch, pt << 16); | |
360 | ||
361 | /* start timer */ | |
362 | spin_lock_irqsave(&rec->timer_lock, flags); | |
363 | if (! rec->timer_running) { | |
364 | rec->timer.expires = jiffies + 1; | |
365 | add_timer(&rec->timer); | |
366 | rec->timer_running = 1; | |
367 | } | |
368 | spin_unlock_irqrestore(&rec->timer_lock, flags); | |
369 | } | |
370 | ||
371 | /* | |
372 | * stop the voice immediately | |
373 | */ | |
374 | static void stop_voice(emu8k_pcm_t *rec, int ch) | |
375 | { | |
376 | unsigned long flags; | |
377 | emu8000_t *hw = rec->emu; | |
378 | ||
379 | EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F); | |
380 | ||
381 | /* stop timer */ | |
382 | spin_lock_irqsave(&rec->timer_lock, flags); | |
383 | if (rec->timer_running) { | |
384 | del_timer(&rec->timer); | |
385 | rec->timer_running = 0; | |
386 | } | |
387 | spin_unlock_irqrestore(&rec->timer_lock, flags); | |
388 | } | |
389 | ||
390 | static int emu8k_pcm_trigger(snd_pcm_substream_t *subs, int cmd) | |
391 | { | |
392 | emu8k_pcm_t *rec = subs->runtime->private_data; | |
393 | int ch; | |
394 | ||
395 | switch (cmd) { | |
396 | case SNDRV_PCM_TRIGGER_START: | |
397 | for (ch = 0; ch < rec->voices; ch++) | |
398 | start_voice(rec, ch); | |
399 | rec->running = 1; | |
400 | break; | |
401 | case SNDRV_PCM_TRIGGER_STOP: | |
402 | rec->running = 0; | |
403 | for (ch = 0; ch < rec->voices; ch++) | |
404 | stop_voice(rec, ch); | |
405 | break; | |
406 | default: | |
407 | return -EINVAL; | |
408 | } | |
409 | return 0; | |
410 | } | |
411 | ||
412 | ||
413 | /* | |
414 | * copy / silence ops | |
415 | */ | |
416 | ||
417 | /* | |
418 | * this macro should be inserted in the copy/silence loops | |
419 | * to reduce the latency. without this, the system will hang up | |
420 | * during the whole loop. | |
421 | */ | |
422 | #define CHECK_SCHEDULER() \ | |
423 | do { \ | |
424 | cond_resched();\ | |
425 | if (signal_pending(current))\ | |
426 | return -EAGAIN;\ | |
427 | } while (0) | |
428 | ||
429 | ||
430 | #ifdef USE_NONINTERLEAVE | |
431 | /* copy one channel block */ | |
432 | static int emu8k_transfer_block(emu8000_t *emu, int offset, unsigned short *buf, int count) | |
433 | { | |
434 | EMU8000_SMALW_WRITE(emu, offset); | |
435 | while (count > 0) { | |
436 | unsigned short sval; | |
437 | CHECK_SCHEDULER(); | |
438 | get_user(sval, buf); | |
439 | EMU8000_SMLD_WRITE(emu, sval); | |
440 | buf++; | |
441 | count--; | |
442 | } | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static int emu8k_pcm_copy(snd_pcm_substream_t *subs, | |
447 | int voice, | |
448 | snd_pcm_uframes_t pos, | |
449 | void *src, | |
450 | snd_pcm_uframes_t count) | |
451 | { | |
452 | emu8k_pcm_t *rec = subs->runtime->private_data; | |
453 | emu8000_t *emu = rec->emu; | |
454 | ||
455 | snd_emu8000_write_wait(emu, 1); | |
456 | if (voice == -1) { | |
457 | unsigned short *buf = src; | |
458 | int i, err; | |
459 | count /= rec->voices; | |
460 | for (i = 0; i < rec->voices; i++) { | |
461 | err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count); | |
462 | if (err < 0) | |
463 | return err; | |
464 | buf += count; | |
465 | } | |
466 | return 0; | |
467 | } else { | |
468 | return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count); | |
469 | } | |
470 | } | |
471 | ||
472 | /* make a channel block silence */ | |
473 | static int emu8k_silence_block(emu8000_t *emu, int offset, int count) | |
474 | { | |
475 | EMU8000_SMALW_WRITE(emu, offset); | |
476 | while (count > 0) { | |
477 | CHECK_SCHEDULER(); | |
478 | EMU8000_SMLD_WRITE(emu, 0); | |
479 | count--; | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | ||
484 | static int emu8k_pcm_silence(snd_pcm_substream_t *subs, | |
485 | int voice, | |
486 | snd_pcm_uframes_t pos, | |
487 | snd_pcm_uframes_t count) | |
488 | { | |
489 | emu8k_pcm_t *rec = subs->runtime->private_data; | |
490 | emu8000_t *emu = rec->emu; | |
491 | ||
492 | snd_emu8000_write_wait(emu, 1); | |
493 | if (voice == -1 && rec->voices == 1) | |
494 | voice = 0; | |
495 | if (voice == -1) { | |
496 | int err; | |
497 | err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2); | |
498 | if (err < 0) | |
499 | return err; | |
500 | return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2); | |
501 | } else { | |
502 | return emu8k_silence_block(emu, pos + rec->loop_start[voice], count); | |
503 | } | |
504 | } | |
505 | ||
506 | #else /* interleave */ | |
507 | ||
508 | /* | |
509 | * copy the interleaved data can be done easily by using | |
510 | * DMA "left" and "right" channels on emu8k engine. | |
511 | */ | |
512 | static int emu8k_pcm_copy(snd_pcm_substream_t *subs, | |
513 | int voice, | |
514 | snd_pcm_uframes_t pos, | |
515 | void __user *src, | |
516 | snd_pcm_uframes_t count) | |
517 | { | |
518 | emu8k_pcm_t *rec = subs->runtime->private_data; | |
519 | emu8000_t *emu = rec->emu; | |
520 | unsigned short __user *buf = src; | |
521 | ||
522 | snd_emu8000_write_wait(emu, 1); | |
523 | EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]); | |
524 | if (rec->voices > 1) | |
525 | EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]); | |
526 | ||
527 | while (count-- > 0) { | |
528 | unsigned short sval; | |
529 | CHECK_SCHEDULER(); | |
530 | get_user(sval, buf); | |
531 | EMU8000_SMLD_WRITE(emu, sval); | |
532 | buf++; | |
533 | if (rec->voices > 1) { | |
534 | CHECK_SCHEDULER(); | |
535 | get_user(sval, buf); | |
536 | EMU8000_SMRD_WRITE(emu, sval); | |
537 | buf++; | |
538 | } | |
539 | } | |
540 | return 0; | |
541 | } | |
542 | ||
543 | static int emu8k_pcm_silence(snd_pcm_substream_t *subs, | |
544 | int voice, | |
545 | snd_pcm_uframes_t pos, | |
546 | snd_pcm_uframes_t count) | |
547 | { | |
548 | emu8k_pcm_t *rec = subs->runtime->private_data; | |
549 | emu8000_t *emu = rec->emu; | |
550 | ||
551 | snd_emu8000_write_wait(emu, 1); | |
552 | EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos); | |
553 | if (rec->voices > 1) | |
554 | EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos); | |
555 | while (count-- > 0) { | |
556 | CHECK_SCHEDULER(); | |
557 | EMU8000_SMLD_WRITE(emu, 0); | |
558 | if (rec->voices > 1) { | |
559 | CHECK_SCHEDULER(); | |
560 | EMU8000_SMRD_WRITE(emu, 0); | |
561 | } | |
562 | } | |
563 | return 0; | |
564 | } | |
565 | #endif | |
566 | ||
567 | ||
568 | /* | |
569 | * allocate a memory block | |
570 | */ | |
571 | static int emu8k_pcm_hw_params(snd_pcm_substream_t *subs, | |
572 | snd_pcm_hw_params_t *hw_params) | |
573 | { | |
574 | emu8k_pcm_t *rec = subs->runtime->private_data; | |
575 | ||
576 | if (rec->block) { | |
577 | /* reallocation - release the old block */ | |
578 | snd_util_mem_free(rec->emu->memhdr, rec->block); | |
579 | rec->block = NULL; | |
580 | } | |
581 | ||
582 | rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4; | |
583 | rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes); | |
584 | if (! rec->block) | |
585 | return -ENOMEM; | |
586 | rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */ | |
587 | /* at least dma_bytes must be set for non-interleaved mode */ | |
588 | subs->dma_buffer.bytes = params_buffer_bytes(hw_params); | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | /* | |
594 | * free the memory block | |
595 | */ | |
596 | static int emu8k_pcm_hw_free(snd_pcm_substream_t *subs) | |
597 | { | |
598 | emu8k_pcm_t *rec = subs->runtime->private_data; | |
599 | ||
600 | if (rec->block) { | |
601 | int ch; | |
602 | for (ch = 0; ch < rec->voices; ch++) | |
603 | stop_voice(rec, ch); // to be sure | |
604 | if (rec->dram_opened) | |
605 | emu8k_close_dram(rec->emu); | |
606 | snd_util_mem_free(rec->emu->memhdr, rec->block); | |
607 | rec->block = NULL; | |
608 | } | |
609 | return 0; | |
610 | } | |
611 | ||
612 | /* | |
613 | */ | |
614 | static int emu8k_pcm_prepare(snd_pcm_substream_t *subs) | |
615 | { | |
616 | emu8k_pcm_t *rec = subs->runtime->private_data; | |
617 | ||
618 | rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate); | |
619 | rec->last_ptr = 0; | |
620 | rec->period_pos = 0; | |
621 | ||
622 | rec->buf_size = subs->runtime->buffer_size; | |
623 | rec->period_size = subs->runtime->period_size; | |
624 | rec->voices = subs->runtime->channels; | |
625 | rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE; | |
626 | if (rec->voices > 1) | |
627 | rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE; | |
628 | if (rec->voices > 1) { | |
629 | rec->panning[0] = 0xff; | |
630 | rec->panning[1] = 0x00; | |
631 | } else | |
632 | rec->panning[0] = 0x80; | |
633 | ||
634 | if (! rec->dram_opened) { | |
635 | int err, i, ch; | |
636 | ||
637 | snd_emux_terminate_all(rec->emu->emu); | |
638 | if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0) | |
639 | return err; | |
640 | rec->dram_opened = 1; | |
641 | ||
642 | /* clear loop blanks */ | |
643 | snd_emu8000_write_wait(rec->emu, 0); | |
644 | EMU8000_SMALW_WRITE(rec->emu, rec->offset); | |
645 | for (i = 0; i < LOOP_BLANK_SIZE; i++) | |
646 | EMU8000_SMLD_WRITE(rec->emu, 0); | |
647 | for (ch = 0; ch < rec->voices; ch++) { | |
648 | EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size); | |
649 | for (i = 0; i < LOOP_BLANK_SIZE; i++) | |
650 | EMU8000_SMLD_WRITE(rec->emu, 0); | |
651 | } | |
652 | } | |
653 | ||
654 | setup_voice(rec, 0); | |
655 | if (rec->voices > 1) | |
656 | setup_voice(rec, 1); | |
657 | return 0; | |
658 | } | |
659 | ||
660 | static snd_pcm_uframes_t emu8k_pcm_pointer(snd_pcm_substream_t *subs) | |
661 | { | |
662 | emu8k_pcm_t *rec = subs->runtime->private_data; | |
663 | if (rec->running) | |
664 | return emu8k_get_curpos(rec, 0); | |
665 | return 0; | |
666 | } | |
667 | ||
668 | ||
669 | static snd_pcm_ops_t emu8k_pcm_ops = { | |
670 | .open = emu8k_pcm_open, | |
671 | .close = emu8k_pcm_close, | |
672 | .ioctl = snd_pcm_lib_ioctl, | |
673 | .hw_params = emu8k_pcm_hw_params, | |
674 | .hw_free = emu8k_pcm_hw_free, | |
675 | .prepare = emu8k_pcm_prepare, | |
676 | .trigger = emu8k_pcm_trigger, | |
677 | .pointer = emu8k_pcm_pointer, | |
678 | .copy = emu8k_pcm_copy, | |
679 | .silence = emu8k_pcm_silence, | |
680 | }; | |
681 | ||
682 | ||
683 | static void snd_emu8000_pcm_free(snd_pcm_t *pcm) | |
684 | { | |
685 | emu8000_t *emu = pcm->private_data; | |
686 | emu->pcm = NULL; | |
687 | } | |
688 | ||
689 | int snd_emu8000_pcm_new(snd_card_t *card, emu8000_t *emu, int index) | |
690 | { | |
691 | snd_pcm_t *pcm; | |
692 | int err; | |
693 | ||
694 | if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0) | |
695 | return err; | |
696 | pcm->private_data = emu; | |
697 | pcm->private_free = snd_emu8000_pcm_free; | |
698 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops); | |
699 | emu->pcm = pcm; | |
700 | ||
701 | snd_device_register(card, pcm); | |
702 | ||
703 | return 0; | |
704 | } |