aboutsummaryrefslogtreecommitdiffstats
path: root/sound/oss/dmabuf.c
blob: baf4244a54f2f9b6d81661c983eb117ae189fb3e (plain) (blame)
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
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
/*
 * sound/dmabuf.c
 *
 * The DMA buffer manager for digitized voice applications
 */
/*
 * Copyright (C) by Hannu Savolainen 1993-1997
 *
 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 *
 * Thomas Sailer   : moved several static variables into struct audio_operations
 *                   (which is grossly misnamed btw.) because they have the same
 *                   lifetime as the rest in there and dynamic allocation saves
 *                   12k or so
 * Thomas Sailer   : remove {in,out}_sleep_flag. It was used for the sleeper to
 *                   determine if it was woken up by the expiring timeout or by
 *                   an explicit wake_up. The return value from schedule_timeout
 *		     can be used instead; if 0, the wakeup was due to the timeout.
 *
 * Rob Riggs		Added persistent DMA buffers (1998/10/17)
 */

#define BE_CONSERVATIVE
#define SAMPLE_ROUNDUP 0

#include "sound_config.h"

#define DMAP_FREE_ON_CLOSE      0
#define DMAP_KEEP_ON_CLOSE      1
extern int sound_dmap_flag;

static void dma_reset_output(int dev);
static void dma_reset_input(int dev);
static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode);



static int debugmem;    	/* switched off by default */
static int dma_buffsize = DSP_BUFFSIZE;

static long dmabuf_timeout(struct dma_buffparms *dmap)
{
	long tmout;

	tmout = (dmap->fragment_size * HZ) / dmap->data_rate;
	tmout += HZ / 5;	/* Some safety distance */
	if (tmout < (HZ / 2))
		tmout = HZ / 2;
	if (tmout > 20 * HZ)
		tmout = 20 * HZ;
	return tmout;
}

static int sound_alloc_dmap(struct dma_buffparms *dmap)
{
	char *start_addr, *end_addr;
	int dma_pagesize;
	int sz, size;
	struct page *page;

	dmap->mapping_flags &= ~DMA_MAP_MAPPED;

	if (dmap->raw_buf != NULL)
		return 0;	/* Already done */
	if (dma_buffsize < 4096)
		dma_buffsize = 4096;
	dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024);
	
	/*
	 *	Now check for the Cyrix problem.
	 */
	 
	if(isa_dma_bridge_buggy==2)
		dma_pagesize=32768;
	 
	dmap->raw_buf = NULL;
	dmap->buffsize = dma_buffsize;
	if (dmap->buffsize > dma_pagesize)
		dmap->buffsize = dma_pagesize;
	start_addr = NULL;
	/*
	 * Now loop until we get a free buffer. Try to get smaller buffer if
	 * it fails. Don't accept smaller than 8k buffer for performance
	 * reasons.
	 */
	while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) {
		for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
		dmap->buffsize = PAGE_SIZE * (1 << sz);
		start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA|__GFP_NOWARN, sz);
		if (start_addr == NULL)
			dmap->buffsize /= 2;
	}

	if (start_addr == NULL) {
		printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n");
		return -ENOMEM;
	} else {
		/* make some checks */
		end_addr = start_addr + dmap->buffsize - 1;

		if (debugmem)
			printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (long) start_addr, (long) end_addr);
		
		/* now check if it fits into the same dma-pagesize */

		if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1))
		    || end_addr >= (char *) (MAX_DMA_ADDRESS)) {
			printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, dmap->buffsize);
			return -EFAULT;
		}
	}
	dmap->raw_buf = start_addr;
	dmap->raw_buf_phys = virt_to_bus(start_addr);

	for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
		SetPageReserved(page);
	return 0;
}

static void sound_free_dmap(struct dma_buffparms *dmap)
{
	int sz, size;
	struct page *page;
	unsigned long start_addr, end_addr;

	if (dmap->raw_buf == NULL)
		return;
	if (dmap->mapping_flags & DMA_MAP_MAPPED)
		return;		/* Don't free mmapped buffer. Will use it next time */
	for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);

	start_addr = (unsigned long) dmap->raw_buf;
	end_addr = start_addr + dmap->buffsize;

	for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
		ClearPageReserved(page);

	free_pages((unsigned long) dmap->raw_buf, sz);
	dmap->raw_buf = NULL;
}


/* Intel version !!!!!!!!! */

static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode)
{
	unsigned long flags;
	int chan = dmap->dma;

	/* printk( "Start DMA%d %d, %d\n",  chan,  (int)(physaddr-dmap->raw_buf_phys),  count); */

	flags = claim_dma_lock();
	disable_dma(chan);
	clear_dma_ff(chan);
	set_dma_mode(chan, dma_mode);
	set_dma_addr(chan, physaddr);
	set_dma_count(chan, count);
	enable_dma(chan);
	release_dma_lock(flags);

	return 0;
}

static void dma_init_buffers(struct dma_buffparms *dmap)
{
	dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
	dmap->byte_counter = 0;
	dmap->max_byte_counter = 8000 * 60 * 60;
	dmap->bytes_in_use = dmap->buffsize;

	dmap->dma_mode = DMODE_NONE;
	dmap->mapping_flags = 0;
	dmap->neutral_byte = 0x80;
	dmap->data_rate = 8000;
	dmap->cfrag = -1;
	dmap->closing = 0;
	dmap->nbufs = 1;
	dmap->flags = DMA_BUSY;	/* Other flags off */
}

static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap)
{
	int err;
	
	if (dmap->flags & DMA_BUSY)
		return -EBUSY;
	if ((err = sound_alloc_dmap(dmap)) < 0)
		return err;

	if (dmap->raw_buf == NULL) {
		printk(KERN_WARNING "Sound: DMA buffers not available\n");
		return -ENOSPC;	/* Memory allocation failed during boot */
	}
	if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) {
		printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma);
		return -EBUSY;
	}
	dma_init_buffers(dmap);
	spin_lock_init(&dmap->lock);
	dmap->open_mode = mode;
	dmap->subdivision = dmap->underrun_count = 0;
	dmap->fragment_size = 0;
	dmap->max_fragments = 65536;	/* Just a large value */
	dmap->byte_counter = 0;
	dmap->max_byte_counter = 8000 * 60 * 60;
	dmap->applic_profile = APF_NORMAL;
	dmap->needs_reorg = 1;
	dmap->audio_callback = NULL;
	dmap->callback_parm = 0;
	return 0;
}

static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap)
{
	unsigned long flags;
	
	if (dmap->dma >= 0) {
		sound_close_dma(dmap->dma);
		flags=claim_dma_lock();
		disable_dma(dmap->dma);
		release_dma_lock(flags);
	}
	if (dmap->flags & DMA_BUSY)
		dmap->dma_mode = DMODE_NONE;
	dmap->flags &= ~DMA_BUSY;
	
	if (sound_dmap_flag == DMAP_FREE_ON_CLOSE)
		sound_free_dmap(dmap);
}


static unsigned int default_set_bits(int dev, unsigned int bits)
{
	mm_segment_t fs = get_fs();

	set_fs(get_ds());
	audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (void __user *)&bits);
	set_fs(fs);
	return bits;
}

static int default_set_speed(int dev, int speed)
{
	mm_segment_t fs = get_fs();

	set_fs(get_ds());
	audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (void __user *)&speed);
	set_fs(fs);
	return speed;
}

static short default_set_channels(int dev, short channels)
{
	int c = channels;
	mm_segment_t fs = get_fs();

	set_fs(get_ds());
	audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (void __user *)&c);
	set_fs(fs);
	return c;
}

static void check_driver(struct audio_driver *d)
{
	if (d->set_speed == NULL)
		d->set_speed = default_set_speed;
	if (d->set_bits == NULL)
		d->set_bits = default_set_bits;
	if (d->set_channels == NULL)
		d->set_channels = default_set_channels;
}

int DMAbuf_open(int dev, int mode)
{
	struct audio_operations *adev = audio_devs[dev];
	int retval;
	struct dma_buffparms *dmap_in = NULL;
	struct dma_buffparms *dmap_out = NULL;

	if (!adev)
		  return -ENXIO;
	if (!(adev->flags & DMA_DUPLEX))
		adev->dmap_in = adev->dmap_out;
	check_driver(adev->d);

	if ((retval = adev->d->open(dev, mode)) < 0)
		return retval;
	dmap_out = adev->dmap_out;
	dmap_in = adev->dmap_in;
	if (dmap_in == dmap_out)
		adev->flags &= ~DMA_DUPLEX;

	if (mode & OPEN_WRITE) {
		if ((retval = open_dmap(adev, mode, dmap_out)) < 0) {
			adev->d->close(dev);
			return retval;
		}
	}
	adev->enable_bits = mode;

	if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) {
		if ((retval = open_dmap(adev, mode, dmap_in)) < 0) {
			adev->d->close(dev);
			if (mode & OPEN_WRITE)
				close_dmap(adev, dmap_out);
			return retval;
		}
	}
	adev->open_mode = mode;
	adev->go = 1;

	adev->d->set_bits(dev, 8);
	adev->d->set_channels(dev, 1);
	adev->d->set_speed(dev, DSP_DEFAULT_SPEED);
	if (adev->dmap_out->dma_mode == DMODE_OUTPUT) 
		memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
		       adev->dmap_out->bytes_in_use);
	return 0;
}
/* MUST not hold the spinlock */
void DMAbuf_reset(int dev)
{
	if (audio_devs[dev]->open_mode & OPEN_WRITE)
		dma_reset_output(dev);

	if (audio_devs[dev]->open_mode & OPEN_READ)
		dma_reset_input(dev);
}

static void dma_reset_output(int dev)
{
	struct audio_operations *adev = audio_devs[dev];
	unsigned long flags,f ;
	struct dma_buffparms *dmap = adev->dmap_out;

	if (!(dmap->flags & DMA_STARTED))	/* DMA is not active */
		return;

	/*
	 *	First wait until the current fragment has been played completely
	 */
	spin_lock_irqsave(&dmap->lock,flags);
	adev->dmap_out->flags |= DMA_SYNCING;

	adev->dmap_out->underrun_count = 0;
	if (!signal_pending(current) && adev->dmap_out->qlen && 
	    adev->dmap_out->underrun_count == 0){
		spin_unlock_irqrestore(&dmap->lock,flags);
		interruptible_sleep_on_timeout(&adev->out_sleeper,
					       dmabuf_timeout(dmap));
		spin_lock_irqsave(&dmap->lock,flags);
	}
	adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);

	/*
	 *	Finally shut the device off
	 */
	if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output)
		adev->d->halt_io(dev);
	else
		adev->d->halt_output(dev);
	adev->dmap_out->flags &= ~DMA_STARTED;
	
	f=claim_dma_lock();
	clear_dma_ff(dmap->dma);
	disable_dma(dmap->dma);
	release_dma_lock(f);
	
	dmap->byte_counter = 0;
	reorganize_buffers(dev, adev->dmap_out, 0);
	dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
	spin_unlock_irqrestore(&dmap->lock,flags);
}

static void dma_reset_input(int dev)
{
        struct audio_operations *adev = audio_devs[dev];
	unsigned long flags;
	struct dma_buffparms *dmap = adev->dmap_in;

	spin_lock_irqsave(&dmap->lock,flags);
	if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input)
		adev->d->halt_io(dev);
	else
		adev->d->halt_input(dev);
	adev->dmap_in->flags &= ~DMA_STARTED;

	dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
	dmap->byte_counter = 0;
	reorganize_buffers(dev, adev->dmap_in, 1);
	spin_unlock_irqrestore(&dmap->lock,flags);
}
/* MUST be called with holding the dmap->lock */
void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap)
{
	struct audio_operations *adev = audio_devs[dev];

	if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT))
		return;		/* Don't start DMA yet */
	dmap->dma_mode = DMODE_OUTPUT;

	if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
		if (!(dmap->flags & DMA_STARTED)) {
			reorganize_buffers(dev, dmap, 0);
			if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs))
				return;
			if (!(dmap->flags & DMA_NODMA))
				local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_WRITE);
			dmap->flags |= DMA_STARTED;
		}
		if (dmap->counts[dmap->qhead] == 0)
			dmap->counts[dmap->qhead] = dmap->fragment_size;
		dmap->dma_mode = DMODE_OUTPUT;
		adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size,
				      dmap->counts[dmap->qhead], 1);
		if (adev->d->trigger)
			adev->d->trigger(dev,adev->enable_bits * adev->go);
	}
	dmap->flags |= DMA_ACTIVE;
}

int DMAbuf_sync(int dev)
{
	struct audio_operations *adev = audio_devs[dev];
	unsigned long flags;
	int n = 0;
	struct dma_buffparms *dmap;

	if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT))
		return 0;

	if (adev->dmap_out->dma_mode == DMODE_OUTPUT) {
		dmap = adev->dmap_out;
		spin_lock_irqsave(&dmap->lock,flags);
		if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE))
			DMAbuf_launch_output(dev, dmap);
		adev->dmap_out->flags |= DMA_SYNCING;
		adev->dmap_out->underrun_count = 0;
		while (!signal_pending(current) && n++ <= adev->dmap_out->nbufs && 
		       adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) {
			long t = dmabuf_timeout(dmap);
			spin_unlock_irqrestore(&dmap->lock,flags);
			/* FIXME: not safe may miss events */
			t = interruptible_sleep_on_timeout(&adev->out_sleeper, t);
			spin_lock_irqsave(&dmap->lock,flags);
			if (!t) {
				adev->dmap_out->flags &= ~DMA_SYNCING;
				spin_unlock_irqrestore(&dmap->lock,flags);
				return adev->dmap_out->qlen;
			}
		}
		adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
		
		/*
		 * Some devices such as GUS have huge amount of on board RAM for the
		 * audio data. We have to wait until the device has finished playing.
		 */

		/* still holding the lock */
		if (adev->d->local_qlen) {   /* Device has hidden buffers */
			while (!signal_pending(current) &&
			       adev->d->local_qlen(dev)){
				spin_unlock_irqrestore(&dmap->lock,flags);
				interruptible_sleep_on_timeout(&adev->out_sleeper,
							       dmabuf_timeout(dmap));
				spin_lock_irqsave(&dmap->lock,flags);
			}
		}
		spin_unlock_irqrestore(&dmap->lock,flags);
	}
	adev->dmap_out->dma_mode = DMODE_NONE;
	return adev->dmap_out->qlen;
}

int DMAbuf_release(int dev, int mode)
{
	struct audio_operations *adev = audio_devs[dev];
	struct dma_buffparms *dmap;
	unsigned long flags;

	dmap = adev->dmap_out;
	if (adev->open_mode & OPEN_WRITE)
		adev->dmap_out->closing = 1;

	if (adev->open_mode & OPEN_READ){
		adev->dmap_in->closing = 1;
		dmap = adev->dmap_in;
	}
	if (adev->open_mode & OPEN_WRITE)
		if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED))
			if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT))
				DMAbuf_sync(dev);
	if (adev->dmap_out->dma_mode == DMODE_OUTPUT)
		memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use);

	DMAbuf_reset(dev);
	spin_lock_irqsave(&dmap->lock,flags);
	adev->d->close(dev);

	if (adev->open_mode & OPEN_WRITE)
		close_dmap(adev, adev->dmap_out);

	if (adev->open_mode == OPEN_READ ||
	    (adev->open_mode != OPEN_WRITE &&
	     (adev->flags & DMA_DUPLEX)))
		close_dmap(adev, adev->dmap_in);
	adev->open_mode = 0;
	spin_unlock_irqrestore(&dmap->lock,flags);
	return 0;
}
/* called with dmap->lock dold */
int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap)
{
	struct audio_operations *adev = audio_devs[dev];
	int  err;

	if (!(adev->open_mode & OPEN_READ))
		return 0;
	if (!(adev->enable_bits & PCM_ENABLE_INPUT))
		return 0;
	if (dmap->dma_mode == DMODE_OUTPUT) {	/* Direction change */
		/* release lock - it's not recursive */
		spin_unlock_irq(&dmap->lock);
		DMAbuf_sync(dev);
		DMAbuf_reset(dev);
		spin_lock_irq(&dmap->lock);
		dmap->dma_mode = DMODE_NONE;
	}
	if (!dmap->dma_mode) {
		reorganize_buffers(dev, dmap, 1);
		if ((err = adev->d->prepare_for_input(dev,
				dmap->fragment_size, dmap->nbufs)) < 0)
			return err;
		dmap->dma_mode = DMODE_INPUT;
	}
	if (!(dmap->flags & DMA_ACTIVE)) {
		if (dmap->needs_reorg)
			reorganize_buffers(dev, dmap, 0);
		local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
		adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
				     dmap->fragment_size, 0);
		dmap->flags |= DMA_ACTIVE;
		if (adev->d->trigger)
			adev->d->trigger(dev, adev->enable_bits * adev->go);
	}
	return 0;
}
/* aquires lock */
int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock)
{
	struct audio_operations *adev = audio_devs[dev];
	unsigned long flags;
	int err = 0, n = 0;
	struct dma_buffparms *dmap = adev->dmap_in;
	int go;

	if (!(adev->open_mode & OPEN_READ))
		return -EIO;
	spin_lock_irqsave(&dmap->lock,flags);
	if (dmap->needs_reorg)
		reorganize_buffers(dev, dmap, 0);
	if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) {
/*		  printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/
		  spin_unlock_irqrestore(&dmap->lock,flags);
		  return -EINVAL;
	} else while (dmap->qlen <= 0 && n++ < 10) {
		long timeout = MAX_SCHEDULE_TIMEOUT;
		if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) {
			spin_unlock_irqrestore(&dmap->lock,flags);
			return -EAGAIN;
		}
		if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) {
			spin_unlock_irqrestore(&dmap->lock,flags);
			return err;
		}
		/* Wait for the next block */

		if (dontblock) {
			spin_unlock_irqrestore(&dmap->lock,flags);
			return -EAGAIN;
		}
		if ((go = adev->go))
			timeout = dmabuf_timeout(dmap);

		spin_unlock_irqrestore(&dmap->lock,flags);
		timeout = interruptible_sleep_on_timeout(&adev->in_sleeper,
							 timeout);
		if (!timeout) {
			/* FIXME: include device name */
			err = -EIO;
			printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n");
			dma_reset_input(dev);
		} else
			err = -EINTR;
		spin_lock_irqsave(&dmap->lock,flags);
	}
	spin_unlock_irqrestore(&dmap->lock,flags);

	if (dmap->qlen <= 0)
		return err ? err : -EINTR;
	*buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]];
	*len = dmap->fragment_size - dmap->counts[dmap->qhead];

	return dmap->qhead;
}

int DMAbuf_rmchars(int dev, int buff_no, int c)
{
	struct audio_operations *adev = audio_devs[dev];
	struct dma_buffparms *dmap = adev->dmap_in;
	int p = dmap->counts[dmap->qhead] + c;

	if (dmap->mapping_flags & DMA_MAP_MAPPED)
	{
/*		  printk("Sound: Can't read from mmapped device (2)\n");*/
		return -EINVAL;
	}
	else if (dmap->qlen <= 0)
		return -EIO;
	else if (p >= dmap->fragment_size) {  /* This buffer is completely empty */
		dmap->counts[dmap->qhead] = 0;
		dmap->qlen--;
		dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
	}
	else dmap->counts[dmap->qhead] = p;

	return 0;
}
/* MUST be called with dmap->lock hold */
int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction)
{
	/*
	 *	Try to approximate the active byte position of the DMA pointer within the
	 *	buffer area as well as possible.
	 */

	int pos;
	unsigned long f;

	if (!(dmap->flags & DMA_ACTIVE))
		pos = 0;
	else {
		int chan = dmap->dma;
		
		f=claim_dma_lock();
		clear_dma_ff(chan);
		
		if(!isa_dma_bridge_buggy)
			disable_dma(dmap->dma);
		
		pos = get_dma_residue(chan);
		
		pos = dmap->bytes_in_use - pos;

		if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) {
			if (direction == DMODE_OUTPUT) {
				if (dmap->qhead == 0)
					if (pos > dmap->fragment_size)
						pos = 0;
			} else {
				if (dmap->qtail == 0)
					if (pos > dmap->fragment_size)
						pos = 0;
			}
		}
		if (pos < 0)
			pos = 0;
		if (pos >= dmap->bytes_in_use)
			pos = 0;
		
		if(!isa_dma_bridge_buggy)
			enable_dma(dmap->dma);
			
		release_dma_lock(f);
	}
	/* printk( "%04x ",  pos); */

	return pos;
}

/*
 *	DMAbuf_start_devices() is called by the /dev/music driver to start
 *	one or more audio devices at desired moment.
 */

void DMAbuf_start_devices(unsigned int devmask)
{
	struct audio_operations *adev;
	int dev;

	for (dev = 0; dev < num_audiodevs; dev++) {
		if (!(devmask & (1 << dev)))
			continue;
		if (!(adev = audio_devs[dev]))
			continue;
		if (adev->open_mode == 0)
			continue;
		if (adev->go)
			continue;
		/* OK to start the device */
		adev->go = 1;
		if (adev->d->trigger)
			adev->d->trigger(dev,adev->enable_bits * adev->go);
	}
}
/* via poll called without a lock ?*/
int DMAbuf_space_in_queue(int dev)
{
	struct audio_operations *adev = audio_devs[dev];
	int len, max, tmp;
	struct dma_buffparms *dmap = adev->dmap_out;
	int lim = dmap->nbufs;

	if (lim < 2)
		lim = 2;

	if (dmap->qlen >= lim)	/* No space at all */
		return 0;

	/*
	 *	Verify that there are no more pending buffers than the limit
	 *	defined by the process.
	 */

	max = dmap->max_fragments;
	if (max > lim)
		max = lim;
	len = dmap->qlen;

	if (adev->d->local_qlen) {
		tmp = adev->d->local_qlen(dev);
		if (tmp && len)
			tmp--;	/* This buffer has been counted twice */
		len += tmp;
	}
	if (dmap->byte_counter % dmap->fragment_size)	/* There is a partial fragment */
		len = len + 1;

	if (len >= max)
		return 0;
	return max - len;
}
/* MUST not hold the spinlock  - this function may sleep */
static int output_sleep(int dev, int dontblock)
{
	struct audio_operations *adev = audio_devs[dev];
	int err = 0;
	struct dma_buffparms *dmap = adev->dmap_out;
	long timeout;
	long timeout_value;

	if (dontblock)
		return -EAGAIN;
	if (!(adev->enable_bits & PCM_ENABLE_OUTPUT))
		return -EAGAIN;

	/*
	 * Wait for free space
	 */
	if (signal_pending(current))
		return -EINTR;
	timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT));
	if (timeout) 
		timeout_value = dmabuf_timeout(dmap);
	else
		timeout_value = MAX_SCHEDULE_TIMEOUT;
	timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper,
						       timeout_value);
	if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) {
		printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n");
		dma_reset_output(dev);
	} else {
		if (signal_pending(current))
			err = -EINTR;
	}
	return err;
}
/* called with the lock held */
static int find_output_space(int dev, char **buf, int *size)
{
	struct audio_operations *adev = audio_devs[dev];
	struct dma_buffparms *dmap = adev->dmap_out;
	unsigned long active_offs;
	long len, offs;
	int maxfrags;
	int occupied_bytes = (dmap->user_counter % dmap->fragment_size);

	*buf = dmap->raw_buf;
	if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes)
		return 0;

#ifdef BE_CONSERVATIVE
	active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size;
#else
	active_offs = DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT);
	/* Check for pointer wrapping situation */
	if (active_offs < 0 || active_offs >= dmap->bytes_in_use)
		active_offs = 0;
	active_offs += dmap->byte_counter;
#endif

	offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP;
	if (offs < 0 || offs >= dmap->bytes_in_use) {
		printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs);
		printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use);
		return 0;
	}
	*buf = dmap->raw_buf + offs;

	len = active_offs + dmap->bytes_in_use - dmap->user_counter;	/* Number of unused bytes in buffer */

	if ((offs + len) > dmap->bytes_in_use)
		len = dmap->bytes_in_use - offs;
	if (len < 0) {
		return 0;
	}
	if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes))
		len = (maxfrags * dmap->fragment_size) - occupied_bytes;
	*size = len & ~SAMPLE_ROUNDUP;
	return (*size > 0);
}
/* aquires lock  */
int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock)
{
	struct audio_operations *adev = audio_devs[dev];
	unsigned long flags;
	int err = -EIO;
	struct dma_buffparms *dmap = adev->dmap_out;

	if (dmap->mapping_flags & DMA_MAP_MAPPED) {
/*		printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/
		return -EINVAL;
	}
	spin_lock_irqsave(&dmap->lock,flags);
	if (dmap->needs_reorg)
		reorganize_buffers(dev, dmap, 0);

	if (dmap->dma_mode == DMODE_INPUT) {	/* Direction change */
		spin_unlock_irqrestore(&dmap->lock,flags);
		DMAbuf_reset(dev);
		spin_lock_irqsave(&dmap->lock,flags);
	}
	dmap->dma_mode = DMODE_OUTPUT;

	while (find_output_space(dev, buf, size) <= 0) {
		spin_unlock_irqrestore(&dmap->lock,flags);
		if ((err = output_sleep(dev, dontblock)) < 0) {
			return err;
		}
		spin_lock_irqsave(&dmap->lock,flags);
	}

	spin_unlock_irqrestore(&dmap->lock,flags);
	return 0;
}
/* has to aquire dmap->lock */
int DMAbuf_move_wrpointer(int dev, int l)
{
	struct audio_operations *adev = audio_devs[dev];
	struct dma_buffparms *dmap = adev->dmap_out;
	unsigned long ptr;
	unsigned long end_ptr, p;
	int post;
	unsigned long flags;

	spin_lock_irqsave(&dmap->lock,flags);
	post= (dmap->flags & DMA_POST);
	ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;

	dmap->flags &= ~DMA_POST;
	dmap->cfrag = -1;
	dmap->user_counter += l;
	dmap->flags |= DMA_DIRTY;

	if (dmap->byte_counter >= dmap->max_byte_counter) {
		/* Wrap the byte counters */
		long decr = dmap->byte_counter;
		dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
		decr -= dmap->byte_counter;
		dmap->user_counter -= decr;
	}
	end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;

	p = (dmap->user_counter - 1) % dmap->bytes_in_use;
	dmap->neutral_byte = dmap->raw_buf[p];

	/* Update the fragment based bookkeeping too */
	while (ptr < end_ptr) {
		dmap->counts[dmap->qtail] = dmap->fragment_size;
		dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
		dmap->qlen++;
		ptr += dmap->fragment_size;
	}

	dmap->counts[dmap->qtail] = dmap->user_counter - ptr;

	/*
	 *	Let the low level driver perform some postprocessing to
	 *	the written data.
	 */
	if (adev->d->postprocess_write)
		adev->d->postprocess_write(dev);

	if (!(dmap->flags & DMA_ACTIVE))
		if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1)))
			DMAbuf_launch_output(dev, dmap);

	spin_unlock_irqrestore(&dmap->lock,flags);
	return 0;
}

int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode)
{
	struct audio_operations *adev = audio_devs[dev];
	struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;

	if (dmap->raw_buf == NULL) {
		printk(KERN_ERR "sound: DMA buffer(1) == NULL\n");
		printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in");
		return 0;
	}
	if (dmap->dma < 0)
		return 0;
	sound_start_dma(dmap, physaddr, count, dma_mode);
	return count;
}

static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode)
{
	struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;

	if (dmap->raw_buf == NULL) {
		printk(KERN_ERR "sound: DMA buffer(2) == NULL\n");
		printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in");
		return 0;
	}
	if (dmap->flags & DMA_NODMA)
		return 1;
	if (dmap->dma < 0)
		return 0;
	sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT);
	dmap->flags |= DMA_STARTED;
	return count;
}

static void finish_output_interrupt(int dev, struct dma_buffparms *dmap)
{
	struct audio_operations *adev = audio_devs[dev];

	if (dmap->audio_callback != NULL)
		dmap->audio_callback(dev, dmap->callback_parm);
	wake_up(&adev->out_sleeper);
	wake_up(&adev->poll_sleeper);
}
/* called with dmap->lock held in irq context*/
static void do_outputintr(int dev, int dummy)
{
	struct audio_operations *adev = audio_devs[dev];
	struct dma_buffparms *dmap = adev->dmap_out;
	int this_fragment;

	if (dmap->raw_buf == NULL) {
		printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev);
		return;
	}
	if (dmap->mapping_flags & DMA_MAP_MAPPED) {	/* Virtual memory mapped access */
		/* mmapped access */
		dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
		if (dmap->qhead == 0) {	    /* Wrapped */
			dmap->byte_counter += dmap->bytes_in_use;
			if (dmap->byte_counter >= dmap->max_byte_counter) {	/* Overflow */
				long decr = dmap->byte_counter;
				dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
				decr -= dmap->byte_counter;
				dmap->user_counter -= decr;
			}
		}
		dmap->qlen++;	/* Yes increment it (don't decrement) */
		if (!(adev->flags & DMA_AUTOMODE))
			dmap->flags &= ~DMA_ACTIVE;
		dmap->counts[dmap->qhead] = dmap->fragment_size;
		DMAbuf_launch_output(dev, dmap);
		finish_output_interrupt(dev, dmap);
		return;
	}

	dmap->qlen--;
	this_fragment = dmap->qhead;
	dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;

	if (dmap->qhead == 0) {	/* Wrapped */
		dmap->byte_counter += dmap->bytes_in_use;
		if (dmap->byte_counter >= dmap->max_byte_counter) {	/* Overflow */
			long decr = dmap->byte_counter;
			dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
			decr -= dmap->byte_counter;
			dmap->user_counter -= decr;
		}
	}
	if (!(adev->flags & DMA_AUTOMODE))
		dmap->flags &= ~DMA_ACTIVE;
		
	/*
	 *	This is  dmap->qlen <= 0 except when closing when
	 *	dmap->qlen < 0
	 */
	 
	while (dmap->qlen <= -dmap->closing) {
		dmap->underrun_count++;
		dmap->qlen++;
		if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) {
			dmap->flags &= ~DMA_DIRTY;
			memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
			       adev->dmap_out->buffsize);
		}
		dmap->user_counter += dmap->fragment_size;
		dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
	}
	if (dmap->qlen > 0)
		DMAbuf_launch_output(dev, dmap);
	finish_output_interrupt(dev, dmap);
}
/* called in irq context */
void DMAbuf_outputintr(int dev, int notify_only)
{
	struct audio_operations *adev = audio_devs[dev];
	unsigned long flags;
	struct dma_buffparms *dmap = adev->dmap_out;

	spin_lock_irqsave(&dmap->lock,flags);
	if (!(dmap->flags & DMA_NODMA)) {
		int chan = dmap->dma, pos, n;
		unsigned long f;
		
		f=claim_dma_lock();
		
		if(!isa_dma_bridge_buggy)
			disable_dma(dmap->dma);
		clear_dma_ff(chan);
		pos = dmap->bytes_in_use - get_dma_residue(chan);
		if(!isa_dma_bridge_buggy)
			enable_dma(dmap->dma);
		release_dma_lock(f);
		
		pos = pos / dmap->fragment_size;	/* Actual qhead */
		if (pos < 0 || pos >= dmap->nbufs)
			pos = 0;
		n = 0;
		while (dmap->qhead != pos && n++ < dmap->nbufs)
			do_outputintr(dev, notify_only);
	}
	else
		do_outputintr(dev, notify_only);
	spin_unlock_irqrestore(&dmap->lock,flags);
}
/* called with dmap->lock held in irq context */
static void do_inputintr(int dev)
{
	struct audio_operations *adev = audio_devs[dev];
	struct dma_buffparms *dmap = adev->dmap_in;

	if (dmap->raw_buf == NULL) {
		printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n");
		return;
	}
	if (dmap->mapping_flags & DMA_MAP_MAPPED) {
		dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
		if (dmap->qtail == 0) {		/* Wrapped */
			dmap->byte_counter += dmap->bytes_in_use;
			if (dmap->byte_counter >= dmap->max_byte_counter) {	/* Overflow */
				long decr = dmap->byte_counter;
				dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
				decr -= dmap->byte_counter;
				dmap->user_counter -= decr;
			}
		}
		dmap->qlen++;

		if (!(adev->flags & DMA_AUTOMODE)) {
			if (dmap->needs_reorg)
				reorganize_buffers(dev, dmap, 0);
			local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ);
			adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
					     dmap->fragment_size, 1);
			if (adev->d->trigger)
				adev->d->trigger(dev, adev->enable_bits * adev->go);
		}
		dmap->flags |= DMA_ACTIVE;
	} else if (dmap->qlen >= (dmap->nbufs - 1)) {
		printk(KERN_WARNING "Sound: Recording overrun\n");
		dmap->underrun_count++;

		/* Just throw away the oldest fragment but keep the engine running */
		dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
		dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
	} else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) {
		dmap->qlen++;
		dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
		if (dmap->qtail == 0) {		/* Wrapped */
			dmap->byte_counter += dmap->bytes_in_use;
			if (dmap->byte_counter >= dmap->max_byte_counter) {	/* Overflow */
				long decr = dmap->byte_counter;
				dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
				decr -= dmap->byte_counter;
				dmap->user_counter -= decr;
			}
		}
	}
	if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
		local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
		adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1);
		if (adev->d->trigger)
			adev->d->trigger(dev,adev->enable_bits * adev->go);
	}
	dmap->flags |= DMA_ACTIVE;
	if (dmap->qlen > 0)
	{
		wake_up(&adev->in_sleeper);
		wake_up(&adev->poll_sleeper);
	}
}
/* called in irq context */
void DMAbuf_inputintr(int dev)
{
	struct audio_operations *adev = audio_devs[dev];
	struct dma_buffparms *dmap = adev->dmap_in;
	unsigned long flags;

	spin_lock_irqsave(&dmap->lock,flags);

	if (!(dmap->flags & DMA_NODMA)) {
		int chan = dmap->dma, pos, n;
		unsigned long f;
		
		f=claim_dma_lock();
		if(!isa_dma_bridge_buggy)
			disable_dma(dmap->dma);
		clear_dma_ff(chan);
		pos = dmap->bytes_in_use - get_dma_residue(chan);
		if(!isa_dma_bridge_buggy)
			enable_dma(dmap->dma);
		release_dma_lock(f);

		pos = pos / dmap->fragment_size;	/* Actual qhead */
		if (pos < 0 || pos >= dmap->nbufs)
			pos = 0;

		n = 0;
		while (dmap->qtail != pos && ++n < dmap->nbufs)
			do_inputintr(dev);
	} else
		do_inputintr(dev);
	spin_unlock_irqrestore(&dmap->lock,flags);
}

int DMAbuf_open_dma(int dev)
{
	/*
	 *    NOTE!  This routine opens only the primary DMA channel (output).
	 */
	struct audio_operations *adev = audio_devs[dev];
	int err;

	if ((err = open_dmap(adev, OPEN_READWRITE, adev->dmap_out)) < 0)
		return -EBUSY;
	dma_init_buffers(adev->dmap_out);
	adev->dmap_out->flags |= DMA_ALLOC_DONE;
	adev->dmap_out->fragment_size = adev->dmap_out->buffsize;

	if (adev->dmap_out->dma >= 0) {
		unsigned long flags;

		flags=claim_dma_lock();
		clear_dma_ff(adev->dmap_out->dma);
		disable_dma(adev->dmap_out->dma);
		release_dma_lock(flags);
	}
	return 0;
}

void DMAbuf_close_dma(int dev)
{
	close_dmap(audio_devs[dev], audio_devs[dev]->dmap_out);
}

void DMAbuf_init(int dev, int dma1, int dma2)
{
	struct audio_operations *adev = audio_devs[dev];
	/*
	 * NOTE! This routine could be called several times.
	 */

	/* drag in audio_syms.o */
	{
		extern char audio_syms_symbol;
		audio_syms_symbol = 0;
	}

	if (adev && adev->dmap_out == NULL) {
		if (adev->d == NULL)
			panic("OSS: audio_devs[%d]->d == NULL\n", dev);

		if (adev->parent_dev) {	 /* Use DMA map of the parent dev */
			int parent = adev->parent_dev - 1;
			adev->dmap_out = audio_devs[parent]->dmap_out;
			adev->dmap_in = audio_devs[parent]->dmap_in;
		} else {
			adev->dmap_out = adev->dmap_in = &adev->dmaps[0];
			adev->dmap_out->dma = dma1;
			if (adev->flags & DMA_DUPLEX) {
				adev->dmap_in = &adev->dmaps[1];
				adev->dmap_in->dma = dma2;
			}
		}
		/* Persistent DMA buffers allocated here */
		if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
			if (adev->dmap_in->raw_buf == NULL)
				sound_alloc_dmap(adev->dmap_in);
			if (adev->dmap_out->raw_buf == NULL)
				sound_alloc_dmap(adev->dmap_out);
		}
	}
}

/* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */
static unsigned int poll_input(struct file * file, int dev, poll_table *wait)
{
	struct audio_operations *adev = audio_devs[dev];
	struct dma_buffparms *dmap = adev->dmap_in;

	if (!(adev->open_mode & OPEN_READ))
		return 0;
	if (dmap->mapping_flags & DMA_MAP_MAPPED) {
		if (dmap->qlen)
			return POLLIN | POLLRDNORM;
		return 0;
	}
	if (dmap->dma_mode != DMODE_INPUT) {
		if (dmap->dma_mode == DMODE_NONE &&
		    adev->enable_bits & PCM_ENABLE_INPUT &&
		    !dmap->qlen && adev->go) {
			unsigned long flags;
			
			spin_lock_irqsave(&dmap->lock,flags);
			DMAbuf_activate_recording(dev, dmap);
			spin_unlock_irqrestore(&dmap->lock,flags);
		}
		return 0;
	}
	if (!dmap->qlen)
		return 0;
	return POLLIN | POLLRDNORM;
}

static unsigned int poll_output(struct file * file, int dev, poll_table *wait)
{
	struct audio_operations *adev = audio_devs[dev];
	struct dma_buffparms *dmap = adev->dmap_out;
	
	if (!(adev->open_mode & OPEN_WRITE))
		return 0;
	if (dmap->mapping_flags & DMA_MAP_MAPPED) {
		if (dmap->qlen)
			return POLLOUT | POLLWRNORM;
		return 0;
	}
	if (dmap->dma_mode == DMODE_INPUT)
		return 0;
	if (dmap->dma_mode == DMODE_NONE)
		return POLLOUT | POLLWRNORM;
	if (!DMAbuf_space_in_queue(dev))
		return 0;
	return POLLOUT | POLLWRNORM;
}

unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait)
{
	struct audio_operations *adev = audio_devs[dev];
	poll_wait(file, &adev->poll_sleeper, wait);
	return poll_input(file, dev, wait) | poll_output(file, dev, wait);
}

void DMAbuf_deinit(int dev)
{
	struct audio_operations *adev = audio_devs[dev];
	/* This routine is called when driver is being unloaded */
	if (!adev)
		return;

	/* Persistent DMA buffers deallocated here */
	if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
		sound_free_dmap(adev->dmap_out);
		if (adev->flags & DMA_DUPLEX)
			sound_free_dmap(adev->dmap_in);
	}
}