aboutsummaryrefslogtreecommitdiff
path: root/sound/isa/gus/gus_pcm.c
blob: a7971f5ffe637f16dfe4c6d0e5230eaad61562dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Routines for control of GF1 chip (PCM things)
 *
 *  InterWave chips supports interleaved DMA, but this feature isn't used in
 *  this code.
 *  
 *  This code emulates autoinit DMA transfer for playback, recording by GF1
 *  chip doesn't support autoinit DMA.
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/driver.h>
#include <asm/dma.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/gus.h>
#include <sound/pcm_params.h>
#include "gus_tables.h"

/* maximum rate */

#define SNDRV_GF1_PCM_RATE		48000

#define SNDRV_GF1_PCM_PFLG_NONE		0
#define SNDRV_GF1_PCM_PFLG_ACTIVE	(1<<0)
#define SNDRV_GF1_PCM_PFLG_NEUTRAL	(2<<0)

struct gus_pcm_private {
	struct snd_gus_card * gus;
	struct snd_pcm_substream *substream;
	spinlock_t lock;
	unsigned int voices;
	struct snd_gus_voice *pvoices[2];
	unsigned int memory;
	unsigned short flags;
	unsigned char voice_ctrl, ramp_ctrl;
	unsigned int bpos;
	unsigned int blocks;
	unsigned int block_size;
	unsigned int dma_size;
	wait_queue_head_t sleep;
	atomic_t dma_count;
	int final_volume;
};

static int snd_gf1_pcm_use_dma = 1;

static void snd_gf1_pcm_block_change_ack(struct snd_gus_card * gus, void *private_data)
{
	struct gus_pcm_private *pcmp = private_data;

	if (pcmp) {
		atomic_dec(&pcmp->dma_count);
		wake_up(&pcmp->sleep);
	}
}

static int snd_gf1_pcm_block_change(struct snd_pcm_substream *substream,
				    unsigned int offset,
				    unsigned int addr,
				    unsigned int count)
{
	struct snd_gf1_dma_block block;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct gus_pcm_private *pcmp = runtime->private_data;

	count += offset & 31;
	offset &= ~31;
	// snd_printk("block change - offset = 0x%x, count = 0x%x\n", offset, count);
	memset(&block, 0, sizeof(block));
	block.cmd = SNDRV_GF1_DMA_IRQ;
	if (snd_pcm_format_unsigned(runtime->format))
		block.cmd |= SNDRV_GF1_DMA_UNSIGNED;
	if (snd_pcm_format_width(runtime->format) == 16)
		block.cmd |= SNDRV_GF1_DMA_16BIT;
	block.addr = addr & ~31;
	block.buffer = runtime->dma_area + offset;
	block.buf_addr = runtime->dma_addr + offset;
	block.count = count;
	block.private_data = pcmp;
	block.ack = snd_gf1_pcm_block_change_ack;
	if (!snd_gf1_dma_transfer_block(pcmp->gus, &block, 0, 0))
		atomic_inc(&pcmp->dma_count);
	return 0;
}

static void snd_gf1_pcm_trigger_up(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct gus_pcm_private *pcmp = runtime->private_data;
	struct snd_gus_card * gus = pcmp->gus;
	unsigned long flags;
	unsigned char voice_ctrl, ramp_ctrl;
	unsigned short rate;
	unsigned int curr, begin, end;
	unsigned short vol;
	unsigned char pan;
	unsigned int voice;

	spin_lock_irqsave(&pcmp->lock, flags);
	if (pcmp->flags & SNDRV_GF1_PCM_PFLG_ACTIVE) {
		spin_unlock_irqrestore(&pcmp->lock, flags);
		return;
	}
	pcmp->flags |= SNDRV_GF1_PCM_PFLG_ACTIVE;
	pcmp->final_volume = 0;
	spin_unlock_irqrestore(&pcmp->lock, flags);
	rate = snd_gf1_translate_freq(gus, runtime->rate << 4);
	/* enable WAVE IRQ */
	voice_ctrl = snd_pcm_format_width(runtime->format) == 16 ? 0x24 : 0x20;
	/* enable RAMP IRQ + rollover */
	ramp_ctrl = 0x24;
	if (pcmp->blocks == 1) {
		voice_ctrl |= 0x08;	/* loop enable */
		ramp_ctrl &= ~0x04;	/* disable rollover */
	}
	for (voice = 0; voice < pcmp->voices; voice++) {
		begin = pcmp->memory + voice * (pcmp->dma_size / runtime->channels);
		curr = begin + (pcmp->bpos * pcmp->block_size) / runtime->channels;
		end = curr + (pcmp->block_size / runtime->channels);
		end -= snd_pcm_format_width(runtime->format) == 16 ? 2 : 1;
		// snd_printk("init: curr=0x%x, begin=0x%x, end=0x%x, ctrl=0x%x, ramp=0x%x, rate=0x%x\n", curr, begin, end, voice_ctrl, ramp_ctrl, rate);
		pan = runtime->channels == 2 ? (!voice ? 1 : 14) : 8;
		vol = !voice ? gus->gf1.pcm_volume_level_left : gus->gf1.pcm_volume_level_right;
		spin_lock_irqsave(&gus->reg_lock, flags);
		snd_gf1_select_voice(gus, pcmp->pvoices[voice]->number);
		snd_gf1_write8(gus, SNDRV_GF1_VB_PAN, pan);
		snd_gf1_write16(gus, SNDRV_GF1_VW_FREQUENCY, rate);
		snd_gf1_write_addr(gus, SNDRV_GF1_VA_START, begin << 4, voice_ctrl & 4);
		snd_gf1_write_addr(gus, SNDRV_GF1_VA_END, end << 4, voice_ctrl & 4);
		snd_gf1_write_addr(gus, SNDRV_GF1_VA_CURRENT, curr << 4, voice_ctrl & 4);
		snd_gf1_write16(gus, SNDRV_GF1_VW_VOLUME, SNDRV_GF1_MIN_VOLUME << 4);
		snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_RATE, 0x2f);
		snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_START, SNDRV_GF1_MIN_OFFSET);
		snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_END, vol >> 8);
		snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_CONTROL, ramp_ctrl);
		if (!gus->gf1.enh_mode) {
			snd_gf1_delay(gus);
			snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_CONTROL, ramp_ctrl);
		}
		spin_unlock_irqrestore(&gus->reg_lock, flags);
	}
	spin_lock_irqsave(&gus->reg_lock, flags);
	for (voice = 0; voice < pcmp->voices; voice++) {
		snd_gf1_select_voice(gus, pcmp->pvoices[voice]->number);
		if (gus->gf1.enh_mode)
			snd_gf1_write8(gus, SNDRV_GF1_VB_MODE, 0x00);	/* deactivate voice */
		snd_gf1_write8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL, voice_ctrl);
		voice_ctrl &= ~0x20;
	}
	voice_ctrl |= 0x20;
	if (!gus->gf1.enh_mode) {
		snd_gf1_delay(gus);
		for (voice = 0; voice < pcmp->voices; voice++) {
			snd_gf1_select_voice(gus, pcmp->pvoices[voice]->number);
			snd_gf1_write8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL, voice_ctrl);
			voice_ctrl &= ~0x20;	/* disable IRQ for next voice */
		}
	}
	spin_unlock_irqrestore(&gus->reg_lock, flags);
}

static void snd_gf1_pcm_interrupt_wave(struct snd_gus_card * gus,
				       struct snd_gus_voice *pvoice)
{
	struct gus_pcm_private * pcmp;
	struct snd_pcm_runtime *runtime;
	unsigned char voice_ctrl, ramp_ctrl;
	unsigned int idx;
	unsigned int end, step;

	if (!pvoice->private_data) {
		snd_printd("snd_gf1_pcm: unknown wave irq?\n");
		snd_gf1_smart_stop_voice(gus, pvoice->number);
		return;
	}
	pcmp = pvoice->private_data;
	if (pcmp == NULL) {
		snd_printd("snd_gf1_pcm: unknown wave irq?\n");
		snd_gf1_smart_stop_voice(gus, pvoice->number);
		return;
	}		
	gus = pcmp->gus;
	runtime = pcmp->substream->runtime;

	spin_lock(&gus->reg_lock);
	snd_gf1_select_voice(gus, pvoice->number);
	voice_ctrl = snd_gf1_read8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL) & ~0x8b;
	ramp_ctrl = (snd_gf1_read8(gus, SNDRV_GF1_VB_VOLUME_CONTROL) & ~0xa4) | 0x03;
#if 0
	snd_gf1_select_voice(gus, pvoice->number);
	printk("position = 0x%x\n", (snd_gf1_read_addr(gus, SNDRV_GF1_VA_CURRENT, voice_ctrl & 4) >> 4));
	snd_gf1_select_voice(gus, pcmp->pvoices[1]->number);
	printk("position = 0x%x\n", (snd_gf1_read_addr(gus, SNDRV_GF1_VA_CURRENT, voice_ctrl & 4) >> 4));
	snd_gf1_select_voice(gus, pvoice->number);
#endif
	pcmp->bpos++;
	pcmp->bpos %= pcmp->blocks;
	if (pcmp->bpos + 1 >= pcmp->blocks) {	/* last block? */
		voice_ctrl |= 0x08;	/* enable loop */
	} else {
		ramp_ctrl |= 0x04;	/* enable rollover */
	}
	end = pcmp->memory + (((pcmp->bpos + 1) * pcmp->block_size) / runtime->channels);
	end -= voice_ctrl & 4 ? 2 : 1;
	step = pcmp->dma_size / runtime->channels;
	voice_ctrl |= 0x20;
	if (!pcmp->final_volume) {
		ramp_ctrl |= 0x20;
		ramp_ctrl &= ~0x03;
	}
	for (idx = 0; idx < pcmp->voices; idx++, end += step) {
		snd_gf1_select_voice(gus, pcmp->pvoices[idx]->number);
		snd_gf1_write_addr(gus, SNDRV_GF1_VA_END, end << 4, voice_ctrl & 4);
		snd_gf1_write8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL, voice_ctrl);
		snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_CONTROL, ramp_ctrl);
		voice_ctrl &= ~0x20;
	}
	if (!gus->gf1.enh_mode) {
		snd_gf1_delay(gus);
		voice_ctrl |= 0x20;
		for (idx = 0; idx < pcmp->voices; idx++) {
			snd_gf1_select_voice(gus, pcmp->pvoices[idx]->number);
			snd_gf1_write8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL, voice_ctrl);
			snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_CONTROL, ramp_ctrl);
			voice_ctrl &= ~0x20;
		}
	}
	spin_unlock(&gus->reg_lock);

	snd_pcm_period_elapsed(pcmp->substream);
#if 0
	if ((runtime->flags & SNDRV_PCM_FLG_MMAP) &&
	    *runtime->state == SNDRV_PCM_STATE_RUNNING) {
		end = pcmp->bpos * pcmp->block_size;
		if (runtime->channels > 1) {
			snd_gf1_pcm_block_change(pcmp->substream, end, pcmp->memory + (end / 2), pcmp->block_size / 2);
			snd_gf1_pcm_block_change(pcmp->substream, end + (pcmp->block_size / 2), pcmp->memory + (pcmp->dma_size / 2) + (end / 2), pcmp->block_size / 2);
		} else {
			snd_gf1_pcm_block_change(pcmp->substream, end, pcmp->memory + end, pcmp->block_size);
		}
	}
#endif
}

static void snd_gf1_pcm_interrupt_volume(struct snd_gus_card * gus,
					 struct snd_gus_voice * pvoice)
{
	unsigned short vol;
	int cvoice;
	struct gus_pcm_private *pcmp = pvoice->private_data;

	/* stop ramp, but leave rollover bit untouched */
	spin_lock(&gus->reg_lock);
	snd_gf1_select_voice(gus, pvoice->number);
	snd_gf1_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);
	spin_unlock(&gus->reg_lock);
	if (pcmp == NULL)
		return;
	/* are we active? */
	if (!(pcmp->flags & SNDRV_GF1_PCM_PFLG_ACTIVE))
		return;
	/* load real volume - better precision */
	cvoice = pcmp->pvoices[0] == pvoice ? 0 : 1;
	if (pcmp->substream == NULL)
		return;
	vol = !cvoice ? gus->gf1.pcm_volume_level_left : gus->gf1.pcm_volume_level_right;
	spin_lock(&gus->reg_lock);
	snd_gf1_select_voice(gus, pvoice->number);
	snd_gf1_write16(gus, SNDRV_GF1_VW_VOLUME, vol);
	pcmp->final_volume = 1;
	spin_unlock(&gus->reg_lock);
}

static void snd_gf1_pcm_volume_change(struct snd_gus_card * gus)
{
}

static int snd_gf1_pcm_poke_block(struct snd_gus_card *gus, unsigned char *buf,
				  unsigned int pos, unsigned int count,
				  int w16, int invert)
{
	unsigned int len;
	unsigned long flags;

	// printk("poke block; buf = 0x%x, pos = %i, count = %i, port = 0x%x\n", (int)buf, pos, count, gus->gf1.port);
	while (count > 0) {
		len = count;
		if (len > 512)		/* limit, to allow IRQ */
			len = 512;
		count -= len;
		if (gus->interwave) {
			spin_lock_irqsave(&gus->reg_lock, flags);
			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01 | (invert ? 0x08 : 0x00));
			snd_gf1_dram_addr(gus, pos);
			if (w16) {
				outb(SNDRV_GF1_GW_DRAM_IO16, GUSP(gus, GF1REGSEL));
				outsw(GUSP(gus, GF1DATALOW), buf, len >> 1);
			} else {
				outsb(GUSP(gus, DRAM), buf, len);
			}
			spin_unlock_irqrestore(&gus->reg_lock, flags);
			buf += 512;
			pos += 512;
		} else {
			invert = invert ? 0x80 : 0x00;
			if (w16) {
				len >>= 1;
				while (len--) {
					snd_gf1_poke(gus, pos++, *buf++);
					snd_gf1_poke(gus, pos++, *buf++ ^ invert);
				}
			} else {
				while (len--)
					snd_gf1_poke(gus, pos++, *buf++ ^ invert);
			}
		}
		if (count > 0 && !in_interrupt()) {
			schedule_timeout_interruptible(1);
			if (signal_pending(current))
				return -EAGAIN;
		}
	}
	return 0;
}

static int snd_gf1_pcm_playback_copy(struct snd_pcm_substream *substream,
				     int voice,
				     snd_pcm_uframes_t pos,
				     void __user *src,
				     snd_pcm_uframes_t count)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct gus_pcm_private *pcmp = runtime->private_data;
	unsigned int bpos, len;
	
	bpos = samples_to_bytes(runtime, pos) + (voice * (pcmp->dma_size / 2));
	len = samples_to_bytes(runtime, count);
	snd_assert(bpos <= pcmp->dma_size, return -EIO);
	snd_assert(bpos + len <= pcmp->dma_size, return -EIO);
	if (copy_from_user(runtime->dma_area + bpos, src, len))
		return -EFAULT;
	if (snd_gf1_pcm_use_dma && len > 32) {
		return snd_gf1_pcm_block_change(substream, bpos, pcmp->memory + bpos, len);
	} else {
		struct snd_gus_card *gus = pcmp->gus;
		int err, w16, invert;

		w16 = (snd_pcm_format_width(runtime->format) == 16);
		invert = snd_pcm_format_unsigned(runtime->format);
		if ((err = snd_gf1_pcm_poke_block(gus, runtime->dma_area + bpos, pcmp->memory + bpos, len, w16, invert)) < 0)
			return err;
	}
	return 0;
}

static int snd_gf1_pcm_playback_silence(struct snd_pcm_substream *substream,
					int voice,
					snd_pcm_uframes_t pos,
					snd_pcm_uframes_t count)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct gus_pcm_private *pcmp = runtime->private_data;
	unsigned int bpos, len;
	
	bpos = samples_to_bytes(runtime, pos) + (voice * (pcmp->dma_size / 2));
	len = samples_to_bytes(runtime, count);
	snd_assert(bpos <= pcmp->dma_size, return -EIO);
	snd_assert(bpos + len <= pcmp->dma_size, return -EIO);
	snd_pcm_format_set_silence(runtime->format, runtime->dma_area + bpos, count);
	if (snd_gf1_pcm_use_dma && len > 32) {
		return snd_gf1_pcm_block_change(substream, bpos, pcmp->memory + bpos, len);
	} else {
		struct snd_gus_card *gus = pcmp->gus;
		int err, w16, invert;

		w16 = (snd_pcm_format_width(runtime->format) == 16);
		invert = snd_pcm_format_unsigned(runtime->format);
		if ((err = snd_gf1_pcm_poke_block(gus, runtime->dma_area + bpos, pcmp->memory + bpos, len, w16, invert)) < 0)
			return err;
	}
	return 0;
}

static int snd_gf1_pcm_playback_hw_params(struct snd_pcm_substream *substream,
					  struct snd_pcm_hw_params *hw_params)
{
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct gus_pcm_private *pcmp = runtime->private_data;
	int err;
	
	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
		return err;
	if (err > 0) {	/* change */
		struct snd_gf1_mem_block *block;
		if (pcmp->memory > 0) {
			snd_gf1_mem_free(&gus->gf1.mem_alloc, pcmp->memory);
			pcmp->memory = 0;
		}
		if ((block = snd_gf1_mem_alloc(&gus->gf1.mem_alloc,
		                               SNDRV_GF1_MEM_OWNER_DRIVER,
					       "GF1 PCM",
		                               runtime->dma_bytes, 1, 32,
		                               NULL)) == NULL)
			return -ENOMEM;
		pcmp->memory = block->ptr;
	}
	pcmp->voices = params_channels(hw_params);
	if (pcmp->pvoices[0] == NULL) {
		if ((pcmp->pvoices[0] = snd_gf1_alloc_voice(pcmp->gus, SNDRV_GF1_VOICE_TYPE_PCM, 0, 0)) == NULL)
			return -ENOMEM;
		pcmp->pvoices[0]->handler_wave = snd_gf1_pcm_interrupt_wave;
		pcmp->pvoices[0]->handler_volume = snd_gf1_pcm_interrupt_volume;
		pcmp->pvoices[0]->volume_change = snd_gf1_pcm_volume_change;
		pcmp->pvoices[0]->private_data = pcmp;
	}
	if (pcmp->voices > 1 && pcmp->pvoices[1] == NULL) {
		if ((pcmp->pvoices[1] = snd_gf1_alloc_voice(pcmp->gus, SNDRV_GF1_VOICE_TYPE_PCM, 0, 0)) == NULL)
			return -ENOMEM;
		pcmp->pvoices[1]->handler_wave = snd_gf1_pcm_interrupt_wave;
		pcmp->pvoices[1]->handler_volume = snd_gf1_pcm_interrupt_volume;
		pcmp->pvoices[1]->volume_change = snd_gf1_pcm_volume_change;
		pcmp->pvoices[1]->private_data = pcmp;
	} else if (pcmp->voices == 1) {
		if (pcmp->pvoices[1]) {
			snd_gf1_free_voice(pcmp->gus, pcmp->pvoices[1]);
			pcmp->pvoices[1] = NULL;
		}
	}
	return 0;
}

static int snd_gf1_pcm_playback_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct gus_pcm_private *pcmp = runtime->private_data;

	snd_pcm_lib_free_pages(substream);
	if (pcmp->pvoices[0]) {
		snd_gf1_free_voice(pcmp->gus, pcmp->pvoices[0]);
		pcmp->pvoices[0] = NULL;
	}
	if (pcmp->pvoices[1]) {
		snd_gf1_free_voice(pcmp->gus, pcmp->pvoices[1]);
		pcmp->pvoices[1] = NULL;
	}
	if (pcmp->memory > 0) {
		snd_gf1_mem_free(&pcmp->gus->gf1.mem_alloc, pcmp->memory);
		pcmp->memory = 0;
	}
	return 0;
}

static int snd_gf1_pcm_playback_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct gus_pcm_private *pcmp = runtime->private_data;

	pcmp->bpos = 0;
	pcmp->dma_size = snd_pcm_lib_buffer_bytes(substream);
	pcmp->block_size = snd_pcm_lib_period_bytes(substream);
	pcmp->blocks = pcmp->dma_size / pcmp->block_size;
	return 0;
}

static int snd_gf1_pcm_playback_trigger(struct snd_pcm_substream *substream,
					int cmd)
{
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct gus_pcm_private *pcmp = runtime->private_data;
	int voice;

	if (cmd == SNDRV_PCM_TRIGGER_START) {
		snd_gf1_pcm_trigger_up(substream);
	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
		spin_lock(&pcmp->lock);
		pcmp->flags &= ~SNDRV_GF1_PCM_PFLG_ACTIVE;
		spin_unlock(&pcmp->lock);
		voice = pcmp->pvoices[0]->number;
		snd_gf1_stop_voices(gus, voice, voice);
		if (pcmp->pvoices[1]) {
			voice = pcmp->pvoices[1]->number;
			snd_gf1_stop_voices(gus, voice, voice);
		}
	} else {
		return -EINVAL;
	}
	return 0;
}

static snd_pcm_uframes_t snd_gf1_pcm_playback_pointer(struct snd_pcm_substream *substream)
{
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct gus_pcm_private *pcmp = runtime->private_data;
	unsigned int pos;
	unsigned char voice_ctrl;

	pos = 0;
	spin_lock(&gus->reg_lock);
	if (pcmp->flags & SNDRV_GF1_PCM_PFLG_ACTIVE) {
		snd_gf1_select_voice(gus, pcmp->pvoices[0]->number);
		voice_ctrl = snd_gf1_read8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL);
		pos = (snd_gf1_read_addr(gus, SNDRV_GF1_VA_CURRENT, voice_ctrl & 4) >> 4) - pcmp->memory;
		if (substream->runtime->channels > 1)
			pos <<= 1;
		pos = bytes_to_frames(runtime, pos);
	}
	spin_unlock(&gus->reg_lock);
	return pos;
}

static struct snd_ratnum clock = {
	.num = 9878400/16,
	.den_min = 2,
	.den_max = 257,
	.den_step = 1,
};

static struct snd_pcm_hw_constraint_ratnums hw_constraints_clocks  = {
	.nrats = 1,
	.rats = &clock,
};

static int snd_gf1_pcm_capture_hw_params(struct snd_pcm_substream *substream,
					 struct snd_pcm_hw_params *hw_params)
{
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);

	gus->c_dma_size = params_buffer_bytes(hw_params);
	gus->c_period_size = params_period_bytes(hw_params);
	gus->c_pos = 0;
	gus->gf1.pcm_rcntrl_reg = 0x21;		/* IRQ at end, enable & start */
	if (params_channels(hw_params) > 1)
		gus->gf1.pcm_rcntrl_reg |= 2;
	if (gus->gf1.dma2 > 3)
		gus->gf1.pcm_rcntrl_reg |= 4;
	if (snd_pcm_format_unsigned(params_format(hw_params)))
		gus->gf1.pcm_rcntrl_reg |= 0x80;
	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
}

static int snd_gf1_pcm_capture_hw_free(struct snd_pcm_substream *substream)
{
	return snd_pcm_lib_free_pages(substream);
}

static int snd_gf1_pcm_capture_prepare(struct snd_pcm_substream *substream)
{
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_gf1_i_write8(gus, SNDRV_GF1_GB_RECORD_RATE, runtime->rate_den - 2);
	snd_gf1_i_write8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL, 0);	/* disable sampling */
	snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL);	/* Sampling Control Register */
	snd_dma_program(gus->gf1.dma2, runtime->dma_addr, gus->c_period_size, DMA_MODE_READ);
	return 0;
}

static int snd_gf1_pcm_capture_trigger(struct snd_pcm_substream *substream,
				       int cmd)
{
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
	int val;
	
	if (cmd == SNDRV_PCM_TRIGGER_START) {
		val = gus->gf1.pcm_rcntrl_reg;
	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
		val = 0;
	} else {
		return -EINVAL;
	}

	spin_lock(&gus->reg_lock);
	snd_gf1_write8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL, val);
	snd_gf1_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL);
	spin_unlock(&gus->reg_lock);
	return 0;
}

static snd_pcm_uframes_t snd_gf1_pcm_capture_pointer(struct snd_pcm_substream *substream)
{
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
	int pos = snd_dma_pointer(gus->gf1.dma2, gus->c_period_size);
	pos = bytes_to_frames(substream->runtime, (gus->c_pos + pos) % gus->c_dma_size);
	return pos;
}

static void snd_gf1_pcm_interrupt_dma_read(struct snd_gus_card * gus)
{
	snd_gf1_i_write8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL, 0);	/* disable sampling */
	snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL);	/* Sampling Control Register */
	if (gus->pcm_cap_substream != NULL) {
		snd_gf1_pcm_capture_prepare(gus->pcm_cap_substream); 
		snd_gf1_pcm_capture_trigger(gus->pcm_cap_substream, SNDRV_PCM_TRIGGER_START);
		gus->c_pos += gus->c_period_size;
		snd_pcm_period_elapsed(gus->pcm_cap_substream);
	}
}

static struct snd_pcm_hardware snd_gf1_pcm_playback =
{
	.info =			SNDRV_PCM_INFO_NONINTERLEAVED,
	.formats		= (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
				 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE),
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		5510,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		0,
};

static struct snd_pcm_hardware snd_gf1_pcm_capture =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8,
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_44100,
	.rate_min =		5510,
	.rate_max =		44100,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		0,
};

static void snd_gf1_pcm_playback_free(struct snd_pcm_runtime *runtime)
{
	kfree(runtime->private_data);
}

static int snd_gf1_pcm_playback_open(struct snd_pcm_substream *substream)
{
	struct gus_pcm_private *pcmp;
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	pcmp = kzalloc(sizeof(*pcmp), GFP_KERNEL);
	if (pcmp == NULL)
		return -ENOMEM;
	pcmp->gus = gus;
	spin_lock_init(&pcmp->lock);
	init_waitqueue_head(&pcmp->sleep);
	atomic_set(&pcmp->dma_count, 0);

	runtime->private_data = pcmp;
	runtime->private_free = snd_gf1_pcm_playback_free;

#if 0
	printk("playback.buffer = 0x%lx, gf1.pcm_buffer = 0x%lx\n", (long) pcm->playback.buffer, (long) gus->gf1.pcm_buffer);
#endif
	if ((err = snd_gf1_dma_init(gus)) < 0)
		return err;
	pcmp->flags = SNDRV_GF1_PCM_PFLG_NONE;
	pcmp->substream = substream;
	runtime->hw = snd_gf1_pcm_playback;
	snd_pcm_limit_isa_dma_size(gus->gf1.dma1, &runtime->hw.buffer_bytes_max);
	snd_pcm_limit_isa_dma_size(gus->gf1.dma1, &runtime->hw.period_bytes_max);
	snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 64);
	return 0;
}

static int snd_gf1_pcm_playback_close(struct snd_pcm_substream *substream)
{
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct gus_pcm_private *pcmp = runtime->private_data;
	
	if (!wait_event_timeout(pcmp->sleep, (atomic_read(&pcmp->dma_count) <= 0), 2*HZ))
		snd_printk(KERN_ERR "gf1 pcm - serious DMA problem\n");

	snd_gf1_dma_done(gus);	
	return 0;
}

static int snd_gf1_pcm_capture_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);

	gus->gf1.interrupt_handler_dma_read = snd_gf1_pcm_interrupt_dma_read;
	gus->pcm_cap_substream = substream;
	substream->runtime->hw = snd_gf1_pcm_capture;
	snd_pcm_limit_isa_dma_size(gus->gf1.dma2, &runtime->hw.buffer_bytes_max);
	snd_pcm_limit_isa_dma_size(gus->gf1.dma2, &runtime->hw.period_bytes_max);
	snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				      &hw_constraints_clocks);
	return 0;
}

static int snd_gf1_pcm_capture_close(struct snd_pcm_substream *substream)
{
	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);

	gus->pcm_cap_substream = NULL;
	snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_DMA_READ);
	return 0;
}

static int snd_gf1_pcm_volume_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 127;
	return 0;
}

static int snd_gf1_pcm_volume_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_gus_card *gus = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	
	spin_lock_irqsave(&gus->pcm_volume_level_lock, flags);
	ucontrol->value.integer.value[0] = gus->gf1.pcm_volume_level_left1;
	ucontrol->value.integer.value[1] = gus->gf1.pcm_volume_level_right1;
	spin_unlock_irqrestore(&gus->pcm_volume_level_lock, flags);
	return 0;
}

static int snd_gf1_pcm_volume_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_gus_card *gus = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int change;
	unsigned int idx;
	unsigned short val1, val2, vol;
	struct gus_pcm_private *pcmp;
	struct snd_gus_voice *pvoice;
	
	val1 = ucontrol->value.integer.value[0] & 127;
	val2 = ucontrol->value.integer.value[1] & 127;
	spin_lock_irqsave(&gus->pcm_volume_level_lock, flags);
	change = val1 != gus->gf1.pcm_volume_level_left1 ||
	         val2 != gus->gf1.pcm_volume_level_right1;
	gus->gf1.pcm_volume_level_left1 = val1;
	gus->gf1.pcm_volume_level_right1 = val2;
	gus->gf1.pcm_volume_level_left = snd_gf1_lvol_to_gvol_raw(val1 << 9) << 4;
	gus->gf1.pcm_volume_level_right = snd_gf1_lvol_to_gvol_raw(val2 << 9) << 4;
	spin_unlock_irqrestore(&gus->pcm_volume_level_lock, flags);
	/* are we active? */
	spin_lock_irqsave(&gus->voice_alloc, flags);
	for (idx = 0; idx < 32; idx++) {
		pvoice = &gus->gf1.voices[idx];
		if (!pvoice->pcm)
			continue;
		pcmp = pvoice->private_data;
		if (!(pcmp->flags & SNDRV_GF1_PCM_PFLG_ACTIVE))
			continue;
		/* load real volume - better precision */
		spin_lock_irqsave(&gus->reg_lock, flags);
		snd_gf1_select_voice(gus, pvoice->number);
		snd_gf1_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);
		vol = pvoice == pcmp->pvoices[0] ? gus->gf1.pcm_volume_level_left : gus->gf1.pcm_volume_level_right;
		snd_gf1_write16(gus, SNDRV_GF1_VW_VOLUME, vol);
		pcmp->final_volume = 1;
		spin_unlock_irqrestore(&gus->reg_lock, flags);
	}
	spin_unlock_irqrestore(&gus->voice_alloc, flags);
	return change;
}

static struct snd_kcontrol_new snd_gf1_pcm_volume_control =
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "PCM Playback Volume",
	.info = snd_gf1_pcm_volume_info,
	.get = snd_gf1_pcm_volume_get,
	.put = snd_gf1_pcm_volume_put
};

static struct snd_kcontrol_new snd_gf1_pcm_volume_control1 =
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "GPCM Playback Volume",
	.info = snd_gf1_pcm_volume_info,
	.get = snd_gf1_pcm_volume_get,
	.put = snd_gf1_pcm_volume_put
};

static struct snd_pcm_ops snd_gf1_pcm_playback_ops = {
	.open =		snd_gf1_pcm_playback_open,
	.close =	snd_gf1_pcm_playback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_gf1_pcm_playback_hw_params,
	.hw_free =	snd_gf1_pcm_playback_hw_free,
	.prepare =	snd_gf1_pcm_playback_prepare,
	.trigger =	snd_gf1_pcm_playback_trigger,
	.pointer =	snd_gf1_pcm_playback_pointer,
	.copy =		snd_gf1_pcm_playback_copy,
	.silence =	snd_gf1_pcm_playback_silence,
};

static struct snd_pcm_ops snd_gf1_pcm_capture_ops = {
	.open =		snd_gf1_pcm_capture_open,
	.close =	snd_gf1_pcm_capture_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_gf1_pcm_capture_hw_params,
	.hw_free =	snd_gf1_pcm_capture_hw_free,
	.prepare =	snd_gf1_pcm_capture_prepare,
	.trigger =	snd_gf1_pcm_capture_trigger,
	.pointer =	snd_gf1_pcm_capture_pointer,
};

int snd_gf1_pcm_new(struct snd_gus_card * gus, int pcm_dev, int control_index, struct snd_pcm ** rpcm)
{
	struct snd_card *card;
	struct snd_kcontrol *kctl;
	struct snd_pcm *pcm;
	struct snd_pcm_substream *substream;
	int capture, err;

	if (rpcm)
		*rpcm = NULL;
	card = gus->card;
	capture = !gus->interwave && !gus->ess_flag && !gus->ace_flag ? 1 : 0;
	err = snd_pcm_new(card,
			  gus->interwave ? "AMD InterWave" : "GF1",
			  pcm_dev,
			  gus->gf1.pcm_channels / 2,
			  capture,
			  &pcm);
	if (err < 0)
		return err;
	pcm->private_data = gus;
	/* playback setup */
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_gf1_pcm_playback_ops);

	for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next)
		snd_pcm_lib_preallocate_pages(substream, SNDRV_DMA_TYPE_DEV,
					      snd_dma_isa_data(),
					      64*1024, gus->gf1.dma1 > 3 ? 128*1024 : 64*1024);
	
	pcm->info_flags = 0;
	pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
	if (capture) {
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_gf1_pcm_capture_ops);
		if (gus->gf1.dma2 == gus->gf1.dma1)
			pcm->info_flags |= SNDRV_PCM_INFO_HALF_DUPLEX;
		snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
					      SNDRV_DMA_TYPE_DEV, snd_dma_isa_data(),
					      64*1024, gus->gf1.dma2 > 3 ? 128*1024 : 64*1024);
	}
	strcpy(pcm->name, pcm->id);
	if (gus->interwave) {
		sprintf(pcm->name + strlen(pcm->name), " rev %c", gus->revision + 'A');
	}
	strcat(pcm->name, " (synth)");
	gus->pcm = pcm;

	if (gus->codec_flag)
		kctl = snd_ctl_new1(&snd_gf1_pcm_volume_control1, gus);
	else
		kctl = snd_ctl_new1(&snd_gf1_pcm_volume_control, gus);
	if ((err = snd_ctl_add(card, kctl)) < 0)
		return err;
	kctl->id.index = control_index;

	if (rpcm)
		*rpcm = pcm;
	return 0;
}