Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
   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
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Driver for SiS7019 Audio Accelerator
 *
 *  Copyright (C) 2004-2007, David Dillow
 *  Written by David Dillow <dave@thedillows.org>
 *  Inspired by the Trident 4D-WaveDX/NX driver.
 *
 *  All rights reserved.
 */

#include <linux/init.h>
#include <linux/pci.h>
#include <linux/time.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <sound/core.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include "sis7019.h"

MODULE_AUTHOR("David Dillow <dave@thedillows.org>");
MODULE_DESCRIPTION("SiS7019");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{SiS,SiS7019 Audio Accelerator}}");

static int index = SNDRV_DEFAULT_IDX1;	/* Index 0-MAX */
static char *id = SNDRV_DEFAULT_STR1;	/* ID for this card */
static bool enable = 1;
static int codecs = 1;

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for SiS7019 Audio Accelerator.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for SiS7019 Audio Accelerator.");
module_param(enable, bool, 0444);
MODULE_PARM_DESC(enable, "Enable SiS7019 Audio Accelerator.");
module_param(codecs, int, 0444);
MODULE_PARM_DESC(codecs, "Set bit to indicate that codec number is expected to be present (default 1)");

static const struct pci_device_id snd_sis7019_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_SI, 0x7019) },
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, snd_sis7019_ids);

/* There are three timing modes for the voices.
 *
 * For both playback and capture, when the buffer is one or two periods long,
 * we use the hardware's built-in Mid-Loop Interrupt and End-Loop Interrupt
 * to let us know when the periods have ended.
 *
 * When performing playback with more than two periods per buffer, we set
 * the "Stop Sample Offset" and tell the hardware to interrupt us when we
 * reach it. We then update the offset and continue on until we are
 * interrupted for the next period.
 *
 * Capture channels do not have a SSO, so we allocate a playback channel to
 * use as a timer for the capture periods. We use the SSO on the playback
 * channel to clock out virtual periods, and adjust the virtual period length
 * to maintain synchronization. This algorithm came from the Trident driver.
 *
 * FIXME: It'd be nice to make use of some of the synth features in the
 * hardware, but a woeful lack of documentation is a significant roadblock.
 */
struct voice {
	u16 flags;
#define 	VOICE_IN_USE		1
#define 	VOICE_CAPTURE		2
#define 	VOICE_SSO_TIMING	4
#define 	VOICE_SYNC_TIMING	8
	u16 sync_cso;
	u16 period_size;
	u16 buffer_size;
	u16 sync_period_size;
	u16 sync_buffer_size;
	u32 sso;
	u32 vperiod;
	struct snd_pcm_substream *substream;
	struct voice *timing;
	void __iomem *ctrl_base;
	void __iomem *wave_base;
	void __iomem *sync_base;
	int num;
};

/* We need four pages to store our wave parameters during a suspend. If
 * we're not doing power management, we still need to allocate a page
 * for the silence buffer.
 */
#ifdef CONFIG_PM_SLEEP
#define SIS_SUSPEND_PAGES	4
#else
#define SIS_SUSPEND_PAGES	1
#endif

struct sis7019 {
	unsigned long ioport;
	void __iomem *ioaddr;
	int irq;
	int codecs_present;

	struct pci_dev *pci;
	struct snd_pcm *pcm;
	struct snd_card *card;
	struct snd_ac97 *ac97[3];

	/* Protect against more than one thread hitting the AC97
	 * registers (in a more polite manner than pounding the hardware
	 * semaphore)
	 */
	struct mutex ac97_mutex;

	/* voice_lock protects allocation/freeing of the voice descriptions
	 */
	spinlock_t voice_lock;

	struct voice voices[64];
	struct voice capture_voice;

	/* Allocate pages to store the internal wave state during
	 * suspends. When we're operating, this can be used as a silence
	 * buffer for a timing channel.
	 */
	void *suspend_state[SIS_SUSPEND_PAGES];

	int silence_users;
	dma_addr_t silence_dma_addr;
};

/* These values are also used by the module param 'codecs' to indicate
 * which codecs should be present.
 */
#define SIS_PRIMARY_CODEC_PRESENT	0x0001
#define SIS_SECONDARY_CODEC_PRESENT	0x0002
#define SIS_TERTIARY_CODEC_PRESENT	0x0004

/* The HW offset parameters (Loop End, Stop Sample, End Sample) have a
 * documented range of 8-0xfff8 samples. Given that they are 0-based,
 * that places our period/buffer range at 9-0xfff9 samples. That makes the
 * max buffer size 0xfff9 samples * 2 channels * 2 bytes per sample, and
 * max samples / min samples gives us the max periods in a buffer.
 *
 * We'll add a constraint upon open that limits the period and buffer sample
 * size to values that are legal for the hardware.
 */
static const struct snd_pcm_hardware sis_playback_hw_info = {
	.info = (SNDRV_PCM_INFO_MMAP |
		 SNDRV_PCM_INFO_MMAP_VALID |
		 SNDRV_PCM_INFO_INTERLEAVED |
		 SNDRV_PCM_INFO_BLOCK_TRANSFER |
		 SNDRV_PCM_INFO_SYNC_START |
		 SNDRV_PCM_INFO_RESUME),
	.formats = (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
		    SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE),
	.rates = SNDRV_PCM_RATE_8000_48000 | SNDRV_PCM_RATE_CONTINUOUS,
	.rate_min = 4000,
	.rate_max = 48000,
	.channels_min = 1,
	.channels_max = 2,
	.buffer_bytes_max = (0xfff9 * 4),
	.period_bytes_min = 9,
	.period_bytes_max = (0xfff9 * 4),
	.periods_min = 1,
	.periods_max = (0xfff9 / 9),
};

static const struct snd_pcm_hardware sis_capture_hw_info = {
	.info = (SNDRV_PCM_INFO_MMAP |
		 SNDRV_PCM_INFO_MMAP_VALID |
		 SNDRV_PCM_INFO_INTERLEAVED |
		 SNDRV_PCM_INFO_BLOCK_TRANSFER |
		 SNDRV_PCM_INFO_SYNC_START |
		 SNDRV_PCM_INFO_RESUME),
	.formats = (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
		    SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE),
	.rates = SNDRV_PCM_RATE_48000,
	.rate_min = 4000,
	.rate_max = 48000,
	.channels_min = 1,
	.channels_max = 2,
	.buffer_bytes_max = (0xfff9 * 4),
	.period_bytes_min = 9,
	.period_bytes_max = (0xfff9 * 4),
	.periods_min = 1,
	.periods_max = (0xfff9 / 9),
};

static void sis_update_sso(struct voice *voice, u16 period)
{
	void __iomem *base = voice->ctrl_base;

	voice->sso += period;
	if (voice->sso >= voice->buffer_size)
		voice->sso -= voice->buffer_size;

	/* Enforce the documented hardware minimum offset */
	if (voice->sso < 8)
		voice->sso = 8;

	/* The SSO is in the upper 16 bits of the register. */
	writew(voice->sso & 0xffff, base + SIS_PLAY_DMA_SSO_ESO + 2);
}

static void sis_update_voice(struct voice *voice)
{
	if (voice->flags & VOICE_SSO_TIMING) {
		sis_update_sso(voice, voice->period_size);
	} else if (voice->flags & VOICE_SYNC_TIMING) {
		int sync;

		/* If we've not hit the end of the virtual period, update
		 * our records and keep going.
		 */
		if (voice->vperiod > voice->period_size) {
			voice->vperiod -= voice->period_size;
			if (voice->vperiod < voice->period_size)
				sis_update_sso(voice, voice->vperiod);
			else
				sis_update_sso(voice, voice->period_size);
			return;
		}

		/* Calculate our relative offset between the target and
		 * the actual CSO value. Since we're operating in a loop,
		 * if the value is more than half way around, we can
		 * consider ourselves wrapped.
		 */
		sync = voice->sync_cso;
		sync -= readw(voice->sync_base + SIS_CAPTURE_DMA_FORMAT_CSO);
		if (sync > (voice->sync_buffer_size / 2))
			sync -= voice->sync_buffer_size;

		/* If sync is positive, then we interrupted too early, and
		 * we'll need to come back in a few samples and try again.
		 * There's a minimum wait, as it takes some time for the DMA
		 * engine to startup, etc...
		 */
		if (sync > 0) {
			if (sync < 16)
				sync = 16;
			sis_update_sso(voice, sync);
			return;
		}

		/* Ok, we interrupted right on time, or (hopefully) just
		 * a bit late. We'll adjst our next waiting period based
		 * on how close we got.
		 *
		 * We need to stay just behind the actual channel to ensure
		 * it really is past a period when we get our interrupt --
		 * otherwise we'll fall into the early code above and have
		 * a minimum wait time, which makes us quite late here,
		 * eating into the user's time to refresh the buffer, esp.
		 * if using small periods.
		 *
		 * If we're less than 9 samples behind, we're on target.
		 * Otherwise, shorten the next vperiod by the amount we've
		 * been delayed.
		 */
		if (sync > -9)
			voice->vperiod = voice->sync_period_size + 1;
		else
			voice->vperiod = voice->sync_period_size + sync + 10;

		if (voice->vperiod < voice->buffer_size) {
			sis_update_sso(voice, voice->vperiod);
			voice->vperiod = 0;
		} else
			sis_update_sso(voice, voice->period_size);

		sync = voice->sync_cso + voice->sync_period_size;
		if (sync >= voice->sync_buffer_size)
			sync -= voice->sync_buffer_size;
		voice->sync_cso = sync;
	}

	snd_pcm_period_elapsed(voice->substream);
}

static void sis_voice_irq(u32 status, struct voice *voice)
{
	int bit;

	while (status) {
		bit = __ffs(status);
		status >>= bit + 1;
		voice += bit;
		sis_update_voice(voice);
		voice++;
	}
}

static irqreturn_t sis_interrupt(int irq, void *dev)
{
	struct sis7019 *sis = dev;
	unsigned long io = sis->ioport;
	struct voice *voice;
	u32 intr, status;

	/* We only use the DMA interrupts, and we don't enable any other
	 * source of interrupts. But, it is possible to see an interrupt
	 * status that didn't actually interrupt us, so eliminate anything
	 * we're not expecting to avoid falsely claiming an IRQ, and an
	 * ensuing endless loop.
	 */
	intr = inl(io + SIS_GISR);
	intr &= SIS_GISR_AUDIO_PLAY_DMA_IRQ_STATUS |
		SIS_GISR_AUDIO_RECORD_DMA_IRQ_STATUS;
	if (!intr)
		return IRQ_NONE;

	do {
		status = inl(io + SIS_PISR_A);
		if (status) {
			sis_voice_irq(status, sis->voices);
			outl(status, io + SIS_PISR_A);
		}

		status = inl(io + SIS_PISR_B);
		if (status) {
			sis_voice_irq(status, &sis->voices[32]);
			outl(status, io + SIS_PISR_B);
		}

		status = inl(io + SIS_RISR);
		if (status) {
			voice = &sis->capture_voice;
			if (!voice->timing)
				snd_pcm_period_elapsed(voice->substream);

			outl(status, io + SIS_RISR);
		}

		outl(intr, io + SIS_GISR);
		intr = inl(io + SIS_GISR);
		intr &= SIS_GISR_AUDIO_PLAY_DMA_IRQ_STATUS |
			SIS_GISR_AUDIO_RECORD_DMA_IRQ_STATUS;
	} while (intr);

	return IRQ_HANDLED;
}

static u32 sis_rate_to_delta(unsigned int rate)
{
	u32 delta;

	/* This was copied from the trident driver, but it seems its gotten
	 * around a bit... nevertheless, it works well.
	 *
	 * We special case 44100 and 8000 since rounding with the equation
	 * does not give us an accurate enough value. For 11025 and 22050
	 * the equation gives us the best answer. All other frequencies will
	 * also use the equation. JDW
	 */
	if (rate == 44100)
		delta = 0xeb3;
	else if (rate == 8000)
		delta = 0x2ab;
	else if (rate == 48000)
		delta = 0x1000;
	else
		delta = (((rate << 12) + 24000) / 48000) & 0x0000ffff;
	return delta;
}

static void __sis_map_silence(struct sis7019 *sis)
{
	/* Helper function: must hold sis->voice_lock on entry */
	if (!sis->silence_users)
		sis->silence_dma_addr = dma_map_single(&sis->pci->dev,
						sis->suspend_state[0],
						4096, DMA_TO_DEVICE);
	sis->silence_users++;
}

static void __sis_unmap_silence(struct sis7019 *sis)
{
	/* Helper function: must hold sis->voice_lock on entry */
	sis->silence_users--;
	if (!sis->silence_users)
		dma_unmap_single(&sis->pci->dev, sis->silence_dma_addr, 4096,
					DMA_TO_DEVICE);
}

static void sis_free_voice(struct sis7019 *sis, struct voice *voice)
{
	unsigned long flags;

	spin_lock_irqsave(&sis->voice_lock, flags);
	if (voice->timing) {
		__sis_unmap_silence(sis);
		voice->timing->flags &= ~(VOICE_IN_USE | VOICE_SSO_TIMING |
						VOICE_SYNC_TIMING);
		voice->timing = NULL;
	}
	voice->flags &= ~(VOICE_IN_USE | VOICE_SSO_TIMING | VOICE_SYNC_TIMING);
	spin_unlock_irqrestore(&sis->voice_lock, flags);
}

static struct voice *__sis_alloc_playback_voice(struct sis7019 *sis)
{
	/* Must hold the voice_lock on entry */
	struct voice *voice;
	int i;

	for (i = 0; i < 64; i++) {
		voice = &sis->voices[i];
		if (voice->flags & VOICE_IN_USE)
			continue;
		voice->flags |= VOICE_IN_USE;
		goto found_one;
	}
	voice = NULL;

found_one:
	return voice;
}

static struct voice *sis_alloc_playback_voice(struct sis7019 *sis)
{
	struct voice *voice;
	unsigned long flags;

	spin_lock_irqsave(&sis->voice_lock, flags);
	voice = __sis_alloc_playback_voice(sis);
	spin_unlock_irqrestore(&sis->voice_lock, flags);

	return voice;
}

static int sis_alloc_timing_voice(struct snd_pcm_substream *substream,
					struct snd_pcm_hw_params *hw_params)
{
	struct sis7019 *sis = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct voice *voice = runtime->private_data;
	unsigned int period_size, buffer_size;
	unsigned long flags;
	int needed;

	/* If there are one or two periods per buffer, we don't need a
	 * timing voice, as we can use the capture channel's interrupts
	 * to clock out the periods.
	 */
	period_size = params_period_size(hw_params);
	buffer_size = params_buffer_size(hw_params);
	needed = (period_size != buffer_size &&
			period_size != (buffer_size / 2));

	if (needed && !voice->timing) {
		spin_lock_irqsave(&sis->voice_lock, flags);
		voice->timing = __sis_alloc_playback_voice(sis);
		if (voice->timing)
			__sis_map_silence(sis);
		spin_unlock_irqrestore(&sis->voice_lock, flags);
		if (!voice->timing)
			return -ENOMEM;
		voice->timing->substream = substream;
	} else if (!needed && voice->timing) {
		sis_free_voice(sis, voice);
		voice->timing = NULL;
	}

	return 0;
}

static int sis_playback_open(struct snd_pcm_substream *substream)
{
	struct sis7019 *sis = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct voice *voice;

	voice = sis_alloc_playback_voice(sis);
	if (!voice)
		return -EAGAIN;

	voice->substream = substream;
	runtime->private_data = voice;
	runtime->hw = sis_playback_hw_info;
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
						9, 0xfff9);
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
						9, 0xfff9);
	snd_pcm_set_sync(substream);
	return 0;
}

static int sis_substream_close(struct snd_pcm_substream *substream)
{
	struct sis7019 *sis = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct voice *voice = runtime->private_data;

	sis_free_voice(sis, voice);
	return 0;
}

static int sis_playback_hw_params(struct snd_pcm_substream *substream,
					struct snd_pcm_hw_params *hw_params)
{
	return snd_pcm_lib_malloc_pages(substream,
					params_buffer_bytes(hw_params));
}

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

static int sis_pcm_playback_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct voice *voice = runtime->private_data;
	void __iomem *ctrl_base = voice->ctrl_base;
	void __iomem *wave_base = voice->wave_base;
	u32 format, dma_addr, control, sso_eso, delta, reg;
	u16 leo;

	/* We rely on the PCM core to ensure that the parameters for this
	 * substream do not change on us while we're programming the HW.
	 */
	format = 0;
	if (snd_pcm_format_width(runtime->format) == 8)
		format |= SIS_PLAY_DMA_FORMAT_8BIT;
	if (!snd_pcm_format_signed(runtime->format))
		format |= SIS_PLAY_DMA_FORMAT_UNSIGNED;
	if (runtime->channels == 1)
		format |= SIS_PLAY_DMA_FORMAT_MONO;

	/* The baseline setup is for a single period per buffer, and
	 * we add bells and whistles as needed from there.
	 */
	dma_addr = runtime->dma_addr;
	leo = runtime->buffer_size - 1;
	control = leo | SIS_PLAY_DMA_LOOP | SIS_PLAY_DMA_INTR_AT_LEO;
	sso_eso = leo;

	if (runtime->period_size == (runtime->buffer_size / 2)) {
		control |= SIS_PLAY_DMA_INTR_AT_MLP;
	} else if (runtime->period_size != runtime->buffer_size) {
		voice->flags |= VOICE_SSO_TIMING;
		voice->sso = runtime->period_size - 1;
		voice->period_size = runtime->period_size;
		voice->buffer_size = runtime->buffer_size;

		control &= ~SIS_PLAY_DMA_INTR_AT_LEO;
		control |= SIS_PLAY_DMA_INTR_AT_SSO;
		sso_eso |= (runtime->period_size - 1) << 16;
	}

	delta = sis_rate_to_delta(runtime->rate);

	/* Ok, we're ready to go, set up the channel.
	 */
	writel(format, ctrl_base + SIS_PLAY_DMA_FORMAT_CSO);
	writel(dma_addr, ctrl_base + SIS_PLAY_DMA_BASE);
	writel(control, ctrl_base + SIS_PLAY_DMA_CONTROL);
	writel(sso_eso, ctrl_base + SIS_PLAY_DMA_SSO_ESO);

	for (reg = 0; reg < SIS_WAVE_SIZE; reg += 4)
		writel(0, wave_base + reg);

	writel(SIS_WAVE_GENERAL_WAVE_VOLUME, wave_base + SIS_WAVE_GENERAL);
	writel(delta << 16, wave_base + SIS_WAVE_GENERAL_ARTICULATION);
	writel(SIS_WAVE_CHANNEL_CONTROL_FIRST_SAMPLE |
			SIS_WAVE_CHANNEL_CONTROL_AMP_ENABLE |
			SIS_WAVE_CHANNEL_CONTROL_INTERPOLATE_ENABLE,
			wave_base + SIS_WAVE_CHANNEL_CONTROL);

	/* Force PCI writes to post. */
	readl(ctrl_base);

	return 0;
}

static int sis_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct sis7019 *sis = snd_pcm_substream_chip(substream);
	unsigned long io = sis->ioport;
	struct snd_pcm_substream *s;
	struct voice *voice;
	void *chip;
	int starting;
	u32 record = 0;
	u32 play[2] = { 0, 0 };

	/* No locks needed, as the PCM core will hold the locks on the
	 * substreams, and the HW will only start/stop the indicated voices
	 * without changing the state of the others.
	 */
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	case SNDRV_PCM_TRIGGER_RESUME:
		starting = 1;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		starting = 0;
		break;
	default:
		return -EINVAL;
	}

	snd_pcm_group_for_each_entry(s, substream) {
		/* Make sure it is for us... */
		chip = snd_pcm_substream_chip(s);
		if (chip != sis)
			continue;

		voice = s->runtime->private_data;
		if (voice->flags & VOICE_CAPTURE) {
			record |= 1 << voice->num;
			voice = voice->timing;
		}

		/* voice could be NULL if this a recording stream, and it
		 * doesn't have an external timing channel.
		 */
		if (voice)
			play[voice->num / 32] |= 1 << (voice->num & 0x1f);

		snd_pcm_trigger_done(s, substream);
	}

	if (starting) {
		if (record)
			outl(record, io + SIS_RECORD_START_REG);
		if (play[0])
			outl(play[0], io + SIS_PLAY_START_A_REG);
		if (play[1])
			outl(play[1], io + SIS_PLAY_START_B_REG);
	} else {
		if (record)
			outl(record, io + SIS_RECORD_STOP_REG);
		if (play[0])
			outl(play[0], io + SIS_PLAY_STOP_A_REG);
		if (play[1])
			outl(play[1], io + SIS_PLAY_STOP_B_REG);
	}
	return 0;
}

static snd_pcm_uframes_t sis_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct voice *voice = runtime->private_data;
	u32 cso;

	cso = readl(voice->ctrl_base + SIS_PLAY_DMA_FORMAT_CSO);
	cso &= 0xffff;
	return cso;
}

static int sis_capture_open(struct snd_pcm_substream *substream)
{
	struct sis7019 *sis = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct voice *voice = &sis->capture_voice;
	unsigned long flags;

	/* FIXME: The driver only supports recording from one channel
	 * at the moment, but it could support more.
	 */
	spin_lock_irqsave(&sis->voice_lock, flags);
	if (voice->flags & VOICE_IN_USE)
		voice = NULL;
	else
		voice->flags |= VOICE_IN_USE;
	spin_unlock_irqrestore(&sis->voice_lock, flags);

	if (!voice)
		return -EAGAIN;

	voice->substream = substream;
	runtime->private_data = voice;
	runtime->hw = sis_capture_hw_info;
	runtime->hw.rates = sis->ac97[0]->rates[AC97_RATES_ADC];
	snd_pcm_limit_hw_rates(runtime);
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
						9, 0xfff9);
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
						9, 0xfff9);
	snd_pcm_set_sync(substream);
	return 0;
}

static int sis_capture_hw_params(struct snd_pcm_substream *substream,
					struct snd_pcm_hw_params *hw_params)
{
	struct sis7019 *sis = snd_pcm_substream_chip(substream);
	int rc;

	rc = snd_ac97_set_rate(sis->ac97[0], AC97_PCM_LR_ADC_RATE,
						params_rate(hw_params));
	if (rc)
		goto out;

	rc = snd_pcm_lib_malloc_pages(substream,
					params_buffer_bytes(hw_params));
	if (rc < 0)
		goto out;

	rc = sis_alloc_timing_voice(substream, hw_params);

out:
	return rc;
}

static void sis_prepare_timing_voice(struct voice *voice,
					struct snd_pcm_substream *substream)
{
	struct sis7019 *sis = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct voice *timing = voice->timing;
	void __iomem *play_base = timing->ctrl_base;
	void __iomem *wave_base = timing->wave_base;
	u16 buffer_size, period_size;
	u32 format, control, sso_eso, delta;
	u32 vperiod, sso, reg;

	/* Set our initial buffer and period as large as we can given a
	 * single page of silence.
	 */
	buffer_size = 4096 / runtime->channels;
	buffer_size /= snd_pcm_format_size(runtime->format, 1);
	period_size = buffer_size;

	/* Initially, we want to interrupt just a bit behind the end of
	 * the period we're clocking out. 12 samples seems to give a good
	 * delay.
	 *
	 * We want to spread our interrupts throughout the virtual period,
	 * so that we don't end up with two interrupts back to back at the
	 * end -- this helps minimize the effects of any jitter. Adjust our
	 * clocking period size so that the last period is at least a fourth
	 * of a full period.
	 *
	 * This is all moot if we don't need to use virtual periods.
	 */
	vperiod = runtime->period_size + 12;
	if (vperiod > period_size) {
		u16 tail = vperiod % period_size;
		u16 quarter_period = period_size / 4;

		if (tail && tail < quarter_period) {
			u16 loops = vperiod / period_size;

			tail = quarter_period - tail;
			tail += loops - 1;
			tail /= loops;
			period_size -= tail;
		}

		sso = period_size - 1;
	} else {
		/* The initial period will fit inside the buffer, so we
		 * don't need to use virtual periods -- disable them.
		 */
		period_size = runtime->period_size;
		sso = vperiod - 1;
		vperiod = 0;
	}

	/* The interrupt handler implements the timing synchronization, so
	 * setup its state.
	 */
	timing->flags |= VOICE_SYNC_TIMING;
	timing->sync_base = voice->ctrl_base;
	timing->sync_cso = runtime->period_size;
	timing->sync_period_size = runtime->period_size;
	timing->sync_buffer_size = runtime->buffer_size;
	timing->period_size = period_size;
	timing->buffer_size = buffer_size;
	timing->sso = sso;
	timing->vperiod = vperiod;

	/* Using unsigned samples with the all-zero silence buffer
	 * forces the output to the lower rail, killing playback.
	 * So ignore unsigned vs signed -- it doesn't change the timing.
	 */
	format = 0;
	if (snd_pcm_format_width(runtime->format) == 8)
		format = SIS_CAPTURE_DMA_FORMAT_8BIT;
	if (runtime->channels == 1)
		format |= SIS_CAPTURE_DMA_FORMAT_MONO;

	control = timing->buffer_size - 1;
	control |= SIS_PLAY_DMA_LOOP | SIS_PLAY_DMA_INTR_AT_SSO;
	sso_eso = timing->buffer_size - 1;
	sso_eso |= timing->sso << 16;

	delta = sis_rate_to_delta(runtime->rate);

	/* We've done the math, now configure the channel.
	 */
	writel(format, play_base + SIS_PLAY_DMA_FORMAT_CSO);
	writel(sis->silence_dma_addr, play_base + SIS_PLAY_DMA_BASE);
	writel(control, play_base + SIS_PLAY_DMA_CONTROL);
	writel(sso_eso, play_base + SIS_PLAY_DMA_SSO_ESO);

	for (reg = 0; reg < SIS_WAVE_SIZE; reg += 4)
		writel(0, wave_base + reg);

	writel(SIS_WAVE_GENERAL_WAVE_VOLUME, wave_base + SIS_WAVE_GENERAL);
	writel(delta << 16, wave_base + SIS_WAVE_GENERAL_ARTICULATION);
	writel(SIS_WAVE_CHANNEL_CONTROL_FIRST_SAMPLE |
			SIS_WAVE_CHANNEL_CONTROL_AMP_ENABLE |
			SIS_WAVE_CHANNEL_CONTROL_INTERPOLATE_ENABLE,
			wave_base + SIS_WAVE_CHANNEL_CONTROL);
}

static int sis_pcm_capture_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct voice *voice = runtime->private_data;
	void __iomem *rec_base = voice->ctrl_base;
	u32 format, dma_addr, control;
	u16 leo;

	/* We rely on the PCM core to ensure that the parameters for this
	 * substream do not change on us while we're programming the HW.
	 */
	format = 0;
	if (snd_pcm_format_width(runtime->format) == 8)
		format = SIS_CAPTURE_DMA_FORMAT_8BIT;
	if (!snd_pcm_format_signed(runtime->format))
		format |= SIS_CAPTURE_DMA_FORMAT_UNSIGNED;
	if (runtime->channels == 1)
		format |= SIS_CAPTURE_DMA_FORMAT_MONO;

	dma_addr = runtime->dma_addr;
	leo = runtime->buffer_size - 1;
	control = leo | SIS_CAPTURE_DMA_LOOP;

	/* If we've got more than two periods per buffer, then we have
	 * use a timing voice to clock out the periods. Otherwise, we can
	 * use the capture channel's interrupts.
	 */
	if (voice->timing) {
		sis_prepare_timing_voice(voice, substream);
	} else {
		control |= SIS_CAPTURE_DMA_INTR_AT_LEO;
		if (runtime->period_size != runtime->buffer_size)
			control |= SIS_CAPTURE_DMA_INTR_AT_MLP;
	}

	writel(format, rec_base + SIS_CAPTURE_DMA_FORMAT_CSO);
	writel(dma_addr, rec_base + SIS_CAPTURE_DMA_BASE);
	writel(control, rec_base + SIS_CAPTURE_DMA_CONTROL);

	/* Force the writes to post. */
	readl(rec_base);

	return 0;
}

static const struct snd_pcm_ops sis_playback_ops = {
	.open = sis_playback_open,
	.close = sis_substream_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = sis_playback_hw_params,
	.hw_free = sis_hw_free,
	.prepare = sis_pcm_playback_prepare,
	.trigger = sis_pcm_trigger,
	.pointer = sis_pcm_pointer,
};

static const struct snd_pcm_ops sis_capture_ops = {
	.open = sis_capture_open,
	.close = sis_substream_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = sis_capture_hw_params,
	.hw_free = sis_hw_free,
	.prepare = sis_pcm_capture_prepare,
	.trigger = sis_pcm_trigger,
	.pointer = sis_pcm_pointer,
};

static int sis_pcm_create(struct sis7019 *sis)
{
	struct snd_pcm *pcm;
	int rc;

	/* We have 64 voices, and the driver currently records from
	 * only one channel, though that could change in the future.
	 */
	rc = snd_pcm_new(sis->card, "SiS7019", 0, 64, 1, &pcm);
	if (rc)
		return rc;

	pcm->private_data = sis;
	strcpy(pcm->name, "SiS7019");
	sis->pcm = pcm;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &sis_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &sis_capture_ops);

	/* Try to preallocate some memory, but it's not the end of the
	 * world if this fails.
	 */
	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
				snd_dma_pci_data(sis->pci), 64*1024, 128*1024);

	return 0;
}

static unsigned short sis_ac97_rw(struct sis7019 *sis, int codec, u32 cmd)
{
	unsigned long io = sis->ioport;
	unsigned short val = 0xffff;
	u16 status;
	u16 rdy;
	int count;
	static const u16 codec_ready[3] = {
		SIS_AC97_STATUS_CODEC_READY,
		SIS_AC97_STATUS_CODEC2_READY,
		SIS_AC97_STATUS_CODEC3_READY,
	};

	rdy = codec_ready[codec];


	/* Get the AC97 semaphore -- software first, so we don't spin
	 * pounding out IO reads on the hardware semaphore...
	 */
	mutex_lock(&sis->ac97_mutex);

	count = 0xffff;
	while ((inw(io + SIS_AC97_SEMA) & SIS_AC97_SEMA_BUSY) && --count)
		udelay(1);

	if (!count)
		goto timeout;

	/* ... and wait for any outstanding commands to complete ...
	 */
	count = 0xffff;
	do {
		status = inw(io + SIS_AC97_STATUS);
		if ((status & rdy) && !(status & SIS_AC97_STATUS_BUSY))
			break;

		udelay(1);
	} while (--count);

	if (!count)
		goto timeout_sema;

	/* ... before sending our command and waiting for it to finish ...
	 */
	outl(cmd, io + SIS_AC97_CMD);
	udelay(10);

	count = 0xffff;
	while ((inw(io + SIS_AC97_STATUS) & SIS_AC97_STATUS_BUSY) && --count)
		udelay(1);

	/* ... and reading the results (if any).
	 */
	val = inl(io + SIS_AC97_CMD) >> 16;

timeout_sema:
	outl(SIS_AC97_SEMA_RELEASE, io + SIS_AC97_SEMA);
timeout:
	mutex_unlock(&sis->ac97_mutex);

	if (!count) {
		dev_err(&sis->pci->dev, "ac97 codec %d timeout cmd 0x%08x\n",
					codec, cmd);
	}

	return val;
}

static void sis_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
				unsigned short val)
{
	static const u32 cmd[3] = {
		SIS_AC97_CMD_CODEC_WRITE,
		SIS_AC97_CMD_CODEC2_WRITE,
		SIS_AC97_CMD_CODEC3_WRITE,
	};
	sis_ac97_rw(ac97->private_data, ac97->num,
			(val << 16) | (reg << 8) | cmd[ac97->num]);
}

static unsigned short sis_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
	static const u32 cmd[3] = {
		SIS_AC97_CMD_CODEC_READ,
		SIS_AC97_CMD_CODEC2_READ,
		SIS_AC97_CMD_CODEC3_READ,
	};
	return sis_ac97_rw(ac97->private_data, ac97->num,
					(reg << 8) | cmd[ac97->num]);
}

static int sis_mixer_create(struct sis7019 *sis)
{
	struct snd_ac97_bus *bus;
	struct snd_ac97_template ac97;
	static struct snd_ac97_bus_ops ops = {
		.write = sis_ac97_write,
		.read = sis_ac97_read,
	};
	int rc;

	memset(&ac97, 0, sizeof(ac97));
	ac97.private_data = sis;

	rc = snd_ac97_bus(sis->card, 0, &ops, NULL, &bus);
	if (!rc && sis->codecs_present & SIS_PRIMARY_CODEC_PRESENT)
		rc = snd_ac97_mixer(bus, &ac97, &sis->ac97[0]);
	ac97.num = 1;
	if (!rc && (sis->codecs_present & SIS_SECONDARY_CODEC_PRESENT))
		rc = snd_ac97_mixer(bus, &ac97, &sis->ac97[1]);
	ac97.num = 2;
	if (!rc && (sis->codecs_present & SIS_TERTIARY_CODEC_PRESENT))
		rc = snd_ac97_mixer(bus, &ac97, &sis->ac97[2]);

	/* If we return an error here, then snd_card_free() should
	 * free up any ac97 codecs that got created, as well as the bus.
	 */
	return rc;
}

static void sis_free_suspend(struct sis7019 *sis)
{
	int i;

	for (i = 0; i < SIS_SUSPEND_PAGES; i++)
		kfree(sis->suspend_state[i]);
}

static int sis_chip_free(struct sis7019 *sis)
{
	/* Reset the chip, and disable all interrputs.
	 */
	outl(SIS_GCR_SOFTWARE_RESET, sis->ioport + SIS_GCR);
	udelay(25);
	outl(0, sis->ioport + SIS_GCR);
	outl(0, sis->ioport + SIS_GIER);

	/* Now, free everything we allocated.
	 */
	if (sis->irq >= 0)
		free_irq(sis->irq, sis);

	iounmap(sis->ioaddr);
	pci_release_regions(sis->pci);
	pci_disable_device(sis->pci);
	sis_free_suspend(sis);
	return 0;
}

static int sis_dev_free(struct snd_device *dev)
{
	struct sis7019 *sis = dev->device_data;
	return sis_chip_free(sis);
}

static int sis_chip_init(struct sis7019 *sis)
{
	unsigned long io = sis->ioport;
	void __iomem *ioaddr = sis->ioaddr;
	unsigned long timeout;
	u16 status;
	int count;
	int i;

	/* Reset the audio controller
	 */
	outl(SIS_GCR_SOFTWARE_RESET, io + SIS_GCR);
	udelay(25);
	outl(0, io + SIS_GCR);

	/* Get the AC-link semaphore, and reset the codecs
	 */
	count = 0xffff;
	while ((inw(io + SIS_AC97_SEMA) & SIS_AC97_SEMA_BUSY) && --count)
		udelay(1);

	if (!count)
		return -EIO;

	outl(SIS_AC97_CMD_CODEC_COLD_RESET, io + SIS_AC97_CMD);
	udelay(250);

	count = 0xffff;
	while ((inw(io + SIS_AC97_STATUS) & SIS_AC97_STATUS_BUSY) && --count)
		udelay(1);

	/* Command complete, we can let go of the semaphore now.
	 */
	outl(SIS_AC97_SEMA_RELEASE, io + SIS_AC97_SEMA);
	if (!count)
		return -EIO;

	/* Now that we've finished the reset, find out what's attached.
	 * There are some codec/board combinations that take an extremely
	 * long time to come up. 350+ ms has been observed in the field,
	 * so we'll give them up to 500ms.
	 */
	sis->codecs_present = 0;
	timeout = msecs_to_jiffies(500) + jiffies;
	while (time_before_eq(jiffies, timeout)) {
		status = inl(io + SIS_AC97_STATUS);
		if (status & SIS_AC97_STATUS_CODEC_READY)
			sis->codecs_present |= SIS_PRIMARY_CODEC_PRESENT;
		if (status & SIS_AC97_STATUS_CODEC2_READY)
			sis->codecs_present |= SIS_SECONDARY_CODEC_PRESENT;
		if (status & SIS_AC97_STATUS_CODEC3_READY)
			sis->codecs_present |= SIS_TERTIARY_CODEC_PRESENT;

		if (sis->codecs_present == codecs)
			break;

		msleep(1);
	}

	/* All done, check for errors.
	 */
	if (!sis->codecs_present) {
		dev_err(&sis->pci->dev, "could not find any codecs\n");
		return -EIO;
	}

	if (sis->codecs_present != codecs) {
		dev_warn(&sis->pci->dev, "missing codecs, found %0x, expected %0x\n",
					 sis->codecs_present, codecs);
	}

	/* Let the hardware know that the audio driver is alive,
	 * and enable PCM slots on the AC-link for L/R playback (3 & 4) and
	 * record channels. We're going to want to use Variable Rate Audio
	 * for recording, to avoid needlessly resampling from 48kHZ.
	 */
	outl(SIS_AC97_CONF_AUDIO_ALIVE, io + SIS_AC97_CONF);
	outl(SIS_AC97_CONF_AUDIO_ALIVE | SIS_AC97_CONF_PCM_LR_ENABLE |
		SIS_AC97_CONF_PCM_CAP_MIC_ENABLE |
		SIS_AC97_CONF_PCM_CAP_LR_ENABLE |
		SIS_AC97_CONF_CODEC_VRA_ENABLE, io + SIS_AC97_CONF);

	/* All AC97 PCM slots should be sourced from sub-mixer 0.
	 */
	outl(0, io + SIS_AC97_PSR);

	/* There is only one valid DMA setup for a PCI environment.
	 */
	outl(SIS_DMA_CSR_PCI_SETTINGS, io + SIS_DMA_CSR);

	/* Reset the synchronization groups for all of the channels
	 * to be asynchronous. If we start doing SPDIF or 5.1 sound, etc.
	 * we'll need to change how we handle these. Until then, we just
	 * assign sub-mixer 0 to all playback channels, and avoid any
	 * attenuation on the audio.
	 */
	outl(0, io + SIS_PLAY_SYNC_GROUP_A);
	outl(0, io + SIS_PLAY_SYNC_GROUP_B);
	outl(0, io + SIS_PLAY_SYNC_GROUP_C);
	outl(0, io + SIS_PLAY_SYNC_GROUP_D);
	outl(0, io + SIS_MIXER_SYNC_GROUP);

	for (i = 0; i < 64; i++) {
		writel(i, SIS_MIXER_START_ADDR(ioaddr, i));
		writel(SIS_MIXER_RIGHT_NO_ATTEN | SIS_MIXER_LEFT_NO_ATTEN |
				SIS_MIXER_DEST_0, SIS_MIXER_ADDR(ioaddr, i));
	}

	/* Don't attenuate any audio set for the wave amplifier.
	 *
	 * FIXME: Maximum attenuation is set for the music amp, which will
	 * need to change if we start using the synth engine.
	 */
	outl(0xffff0000, io + SIS_WEVCR);

	/* Ensure that the wave engine is in normal operating mode.
	 */
	outl(0, io + SIS_WECCR);

	/* Go ahead and enable the DMA interrupts. They won't go live
	 * until we start a channel.
	 */
	outl(SIS_GIER_AUDIO_PLAY_DMA_IRQ_ENABLE |
		SIS_GIER_AUDIO_RECORD_DMA_IRQ_ENABLE, io + SIS_GIER);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int sis_suspend(struct device *dev)
{
	struct snd_card *card = dev_get_drvdata(dev);
	struct sis7019 *sis = card->private_data;
	void __iomem *ioaddr = sis->ioaddr;
	int i;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
	if (sis->codecs_present & SIS_PRIMARY_CODEC_PRESENT)
		snd_ac97_suspend(sis->ac97[0]);
	if (sis->codecs_present & SIS_SECONDARY_CODEC_PRESENT)
		snd_ac97_suspend(sis->ac97[1]);
	if (sis->codecs_present & SIS_TERTIARY_CODEC_PRESENT)
		snd_ac97_suspend(sis->ac97[2]);

	/* snd_pcm_suspend_all() stopped all channels, so we're quiescent.
	 */
	if (sis->irq >= 0) {
		free_irq(sis->irq, sis);
		sis->irq = -1;
	}

	/* Save the internal state away
	 */
	for (i = 0; i < 4; i++) {
		memcpy_fromio(sis->suspend_state[i], ioaddr, 4096);
		ioaddr += 4096;
	}

	return 0;
}

static int sis_resume(struct device *dev)
{
	struct pci_dev *pci = to_pci_dev(dev);
	struct snd_card *card = dev_get_drvdata(dev);
	struct sis7019 *sis = card->private_data;
	void __iomem *ioaddr = sis->ioaddr;
	int i;

	if (sis_chip_init(sis)) {
		dev_err(&pci->dev, "unable to re-init controller\n");
		goto error;
	}

	if (request_irq(pci->irq, sis_interrupt, IRQF_SHARED,
			KBUILD_MODNAME, sis)) {
		dev_err(&pci->dev, "unable to regain IRQ %d\n", pci->irq);
		goto error;
	}

	/* Restore saved state, then clear out the page we use for the
	 * silence buffer.
	 */
	for (i = 0; i < 4; i++) {
		memcpy_toio(ioaddr, sis->suspend_state[i], 4096);
		ioaddr += 4096;
	}

	memset(sis->suspend_state[0], 0, 4096);

	sis->irq = pci->irq;

	if (sis->codecs_present & SIS_PRIMARY_CODEC_PRESENT)
		snd_ac97_resume(sis->ac97[0]);
	if (sis->codecs_present & SIS_SECONDARY_CODEC_PRESENT)
		snd_ac97_resume(sis->ac97[1]);
	if (sis->codecs_present & SIS_TERTIARY_CODEC_PRESENT)
		snd_ac97_resume(sis->ac97[2]);

	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	return 0;

error:
	snd_card_disconnect(card);
	return -EIO;
}

static SIMPLE_DEV_PM_OPS(sis_pm, sis_suspend, sis_resume);
#define SIS_PM_OPS	&sis_pm
#else
#define SIS_PM_OPS	NULL
#endif /* CONFIG_PM_SLEEP */

static int sis_alloc_suspend(struct sis7019 *sis)
{
	int i;

	/* We need 16K to store the internal wave engine state during a
	 * suspend, but we don't need it to be contiguous, so play nice
	 * with the memory system. We'll also use this area for a silence
	 * buffer.
	 */
	for (i = 0; i < SIS_SUSPEND_PAGES; i++) {
		sis->suspend_state[i] = kmalloc(4096, GFP_KERNEL);
		if (!sis->suspend_state[i])
			return -ENOMEM;
	}
	memset(sis->suspend_state[0], 0, 4096);

	return 0;
}

static int sis_chip_create(struct snd_card *card,
			   struct pci_dev *pci)
{
	struct sis7019 *sis = card->private_data;
	struct voice *voice;
	static struct snd_device_ops ops = {
		.dev_free = sis_dev_free,
	};
	int rc;
	int i;

	rc = pci_enable_device(pci);
	if (rc)
		goto error_out;

	rc = dma_set_mask(&pci->dev, DMA_BIT_MASK(30));
	if (rc < 0) {
		dev_err(&pci->dev, "architecture does not support 30-bit PCI busmaster DMA");
		goto error_out_enabled;
	}

	memset(sis, 0, sizeof(*sis));
	mutex_init(&sis->ac97_mutex);
	spin_lock_init(&sis->voice_lock);
	sis->card = card;
	sis->pci = pci;
	sis->irq = -1;
	sis->ioport = pci_resource_start(pci, 0);

	rc = pci_request_regions(pci, "SiS7019");
	if (rc) {
		dev_err(&pci->dev, "unable request regions\n");
		goto error_out_enabled;
	}

	rc = -EIO;
	sis->ioaddr = ioremap_nocache(pci_resource_start(pci, 1), 0x4000);
	if (!sis->ioaddr) {
		dev_err(&pci->dev, "unable to remap MMIO, aborting\n");
		goto error_out_cleanup;
	}

	rc = sis_alloc_suspend(sis);
	if (rc < 0) {
		dev_err(&pci->dev, "unable to allocate state storage\n");
		goto error_out_cleanup;
	}

	rc = sis_chip_init(sis);
	if (rc)
		goto error_out_cleanup;

	rc = request_irq(pci->irq, sis_interrupt, IRQF_SHARED, KBUILD_MODNAME,
			 sis);
	if (rc) {
		dev_err(&pci->dev, "unable to allocate irq %d\n", sis->irq);
		goto error_out_cleanup;
	}

	sis->irq = pci->irq;
	pci_set_master(pci);

	for (i = 0; i < 64; i++) {
		voice = &sis->voices[i];
		voice->num = i;
		voice->ctrl_base = SIS_PLAY_DMA_ADDR(sis->ioaddr, i);
		voice->wave_base = SIS_WAVE_ADDR(sis->ioaddr, i);
	}

	voice = &sis->capture_voice;
	voice->flags = VOICE_CAPTURE;
	voice->num = SIS_CAPTURE_CHAN_AC97_PCM_IN;
	voice->ctrl_base = SIS_CAPTURE_DMA_ADDR(sis->ioaddr, voice->num);

	rc = snd_device_new(card, SNDRV_DEV_LOWLEVEL, sis, &ops);
	if (rc)
		goto error_out_cleanup;

	return 0;

error_out_cleanup:
	sis_chip_free(sis);

error_out_enabled:
	pci_disable_device(pci);

error_out:
	return rc;
}

static int snd_sis7019_probe(struct pci_dev *pci,
			     const struct pci_device_id *pci_id)
{
	struct snd_card *card;
	struct sis7019 *sis;
	int rc;

	rc = -ENOENT;
	if (!enable)
		goto error_out;

	/* The user can specify which codecs should be present so that we
	 * can wait for them to show up if they are slow to recover from
	 * the AC97 cold reset. We default to a single codec, the primary.
	 *
	 * We assume that SIS_PRIMARY_*_PRESENT matches bits 0-2.
	 */
	codecs &= SIS_PRIMARY_CODEC_PRESENT | SIS_SECONDARY_CODEC_PRESENT |
		  SIS_TERTIARY_CODEC_PRESENT;
	if (!codecs)
		codecs = SIS_PRIMARY_CODEC_PRESENT;

	rc = snd_card_new(&pci->dev, index, id, THIS_MODULE,
			  sizeof(*sis), &card);
	if (rc < 0)
		goto error_out;

	strcpy(card->driver, "SiS7019");
	strcpy(card->shortname, "SiS7019");
	rc = sis_chip_create(card, pci);
	if (rc)
		goto card_error_out;

	sis = card->private_data;

	rc = sis_mixer_create(sis);
	if (rc)
		goto card_error_out;

	rc = sis_pcm_create(sis);
	if (rc)
		goto card_error_out;

	snprintf(card->longname, sizeof(card->longname),
			"%s Audio Accelerator with %s at 0x%lx, irq %d",
			card->shortname, snd_ac97_get_short_name(sis->ac97[0]),
			sis->ioport, sis->irq);

	rc = snd_card_register(card);
	if (rc)
		goto card_error_out;

	pci_set_drvdata(pci, card);
	return 0;

card_error_out:
	snd_card_free(card);

error_out:
	return rc;
}

static void snd_sis7019_remove(struct pci_dev *pci)
{
	snd_card_free(pci_get_drvdata(pci));
}

static struct pci_driver sis7019_driver = {
	.name = KBUILD_MODNAME,
	.id_table = snd_sis7019_ids,
	.probe = snd_sis7019_probe,
	.remove = snd_sis7019_remove,
	.driver = {
		.pm = SIS_PM_OPS,
	},
};

module_pci_driver(sis7019_driver);