Free Electrons

Embedded Linux Experts

   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
/****************************************************************************

   Copyright Echo Digital Audio Corporation (c) 1998 - 2004
   All rights reserved
   www.echoaudio.com

   This file is part of Echo Digital Audio's generic driver library.

   Echo Digital Audio's generic driver library 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.

   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.

   *************************************************************************

 Translation from C++ and adaptation for use in ALSA-Driver
 were made by Giuliano Pochini <pochini@shiny.it>

****************************************************************************/

#if PAGE_SIZE < 4096
#error PAGE_SIZE is < 4k
#endif

static int restore_dsp_rettings(struct echoaudio *chip);


/* Some vector commands involve the DSP reading or writing data to and from the
comm page; if you send one of these commands to the DSP, it will complete the
command and then write a non-zero value to the Handshake field in the
comm page.  This function waits for the handshake to show up. */
static int wait_handshake(struct echoaudio *chip)
{
	int i;

	/* Wait up to 20ms for the handshake from the DSP */
	for (i = 0; i < HANDSHAKE_TIMEOUT; i++) {
		/* Look for the handshake value */
		barrier();
		if (chip->comm_page->handshake) {
			return 0;
		}
		udelay(1);
	}

	snd_printk(KERN_ERR "wait_handshake(): Timeout waiting for DSP\n");
	return -EBUSY;
}



/* Much of the interaction between the DSP and the driver is done via vector
commands; send_vector writes a vector command to the DSP.  Typically, this
causes the DSP to read or write fields in the comm page.
PCI posting is not required thanks to the handshake logic. */
static int send_vector(struct echoaudio *chip, u32 command)
{
	int i;

	wmb();	/* Flush all pending writes before sending the command */

	/* Wait up to 100ms for the "vector busy" bit to be off */
	for (i = 0; i < VECTOR_BUSY_TIMEOUT; i++) {
		if (!(get_dsp_register(chip, CHI32_VECTOR_REG) &
		      CHI32_VECTOR_BUSY)) {
			set_dsp_register(chip, CHI32_VECTOR_REG, command);
			/*if (i)  DE_ACT(("send_vector time: %d\n", i));*/
			return 0;
		}
		udelay(1);
	}

	DE_ACT((KERN_ERR "timeout on send_vector\n"));
	return -EBUSY;
}



/* write_dsp writes a 32-bit value to the DSP; this is used almost
exclusively for loading the DSP. */
static int write_dsp(struct echoaudio *chip, u32 data)
{
	u32 status, i;

	for (i = 0; i < 10000000; i++) {	/* timeout = 10s */
		status = get_dsp_register(chip, CHI32_STATUS_REG);
		if ((status & CHI32_STATUS_HOST_WRITE_EMPTY) != 0) {
			set_dsp_register(chip, CHI32_DATA_REG, data);
			wmb();			/* write it immediately */
			return 0;
		}
		udelay(1);
		cond_resched();
	}

	chip->bad_board = TRUE;		/* Set TRUE until DSP re-loaded */
	DE_ACT((KERN_ERR "write_dsp: Set bad_board to TRUE\n"));
	return -EIO;
}



/* read_dsp reads a 32-bit value from the DSP; this is used almost
exclusively for loading the DSP and checking the status of the ASIC. */
static int read_dsp(struct echoaudio *chip, u32 *data)
{
	u32 status, i;

	for (i = 0; i < READ_DSP_TIMEOUT; i++) {
		status = get_dsp_register(chip, CHI32_STATUS_REG);
		if ((status & CHI32_STATUS_HOST_READ_FULL) != 0) {
			*data = get_dsp_register(chip, CHI32_DATA_REG);
			return 0;
		}
		udelay(1);
		cond_resched();
	}

	chip->bad_board = TRUE;		/* Set TRUE until DSP re-loaded */
	DE_INIT((KERN_ERR "read_dsp: Set bad_board to TRUE\n"));
	return -EIO;
}



/****************************************************************************
	Firmware loading functions
 ****************************************************************************/

/* This function is used to read back the serial number from the DSP;
this is triggered by the SET_COMMPAGE_ADDR command.
Only some early Echogals products have serial numbers in the ROM;
the serial number is not used, but you still need to do this as
part of the DSP load process. */
static int read_sn(struct echoaudio *chip)
{
	int i;
	u32 sn[6];

	for (i = 0; i < 5; i++) {
		if (read_dsp(chip, &sn[i])) {
			snd_printk(KERN_ERR "Failed to read serial number\n");
			return -EIO;
		}
	}
	DE_INIT(("Read serial number %08x %08x %08x %08x %08x\n",
		 sn[0], sn[1], sn[2], sn[3], sn[4]));
	return 0;
}



#ifndef ECHOCARD_HAS_ASIC
/* This card has no ASIC, just return ok */
static inline int check_asic_status(struct echoaudio *chip)
{
	chip->asic_loaded = TRUE;
	return 0;
}

#endif /* !ECHOCARD_HAS_ASIC */



#ifdef ECHOCARD_HAS_ASIC

/* Load ASIC code - done after the DSP is loaded */
static int load_asic_generic(struct echoaudio *chip, u32 cmd, short asic)
{
	const struct firmware *fw;
	int err;
	u32 i, size;
	u8 *code;

	err = get_firmware(&fw, chip, asic);
	if (err < 0) {
		snd_printk(KERN_WARNING "Firmware not found !\n");
		return err;
	}

	code = (u8 *)fw->data;
	size = fw->size;

	/* Send the "Here comes the ASIC" command */
	if (write_dsp(chip, cmd) < 0)
		goto la_error;

	/* Write length of ASIC file in bytes */
	if (write_dsp(chip, size) < 0)
		goto la_error;

	for (i = 0; i < size; i++) {
		if (write_dsp(chip, code[i]) < 0)
			goto la_error;
	}

	DE_INIT(("ASIC loaded\n"));
	free_firmware(fw);
	return 0;

la_error:
	DE_INIT(("failed on write_dsp\n"));
	free_firmware(fw);
	return -EIO;
}

#endif /* ECHOCARD_HAS_ASIC */



#ifdef DSP_56361

/* Install the resident loader for 56361 DSPs;  The resident loader is on
the EPROM on the board for 56301 DSP. The resident loader is a tiny little
program that is used to load the real DSP code. */
static int install_resident_loader(struct echoaudio *chip)
{
	u32 address;
	int index, words, i;
	u16 *code;
	u32 status;
	const struct firmware *fw;

	/* 56361 cards only!  This check is required by the old 56301-based
	Mona and Gina24 */
	if (chip->device_id != DEVICE_ID_56361)
		return 0;

	/* Look to see if the resident loader is present.  If the resident
	loader is already installed, host flag 5 will be on. */
	status = get_dsp_register(chip, CHI32_STATUS_REG);
	if (status & CHI32_STATUS_REG_HF5) {
		DE_INIT(("Resident loader already installed; status is 0x%x\n",
			 status));
		return 0;
	}

	i = get_firmware(&fw, chip, FW_361_LOADER);
	if (i < 0) {
		snd_printk(KERN_WARNING "Firmware not found !\n");
		return i;
	}

	/* The DSP code is an array of 16 bit words.  The array is divided up
	into sections.  The first word of each section is the size in words,
	followed by the section type.
	Since DSP addresses and data are 24 bits wide, they each take up two
	16 bit words in the array.
	This is a lot like the other loader loop, but it's not a loop, you
	don't write the memory type, and you don't write a zero at the end. */

	/* Set DSP format bits for 24 bit mode */
	set_dsp_register(chip, CHI32_CONTROL_REG,
			 get_dsp_register(chip, CHI32_CONTROL_REG) | 0x900);

	code = (u16 *)fw->data;

	/* Skip the header section; the first word in the array is the size
	of the first section, so the first real section of code is pointed
	to by Code[0]. */
	index = code[0];

	/* Skip the section size, LRS block type, and DSP memory type */
	index += 3;

	/* Get the number of DSP words to write */
	words = code[index++];

	/* Get the DSP address for this block; 24 bits, so build from two words */
	address = ((u32)code[index] << 16) + code[index + 1];
	index += 2;

	/* Write the count to the DSP */
	if (write_dsp(chip, words)) {
		DE_INIT(("install_resident_loader: Failed to write word count!\n"));
		goto irl_error;
	}
	/* Write the DSP address */
	if (write_dsp(chip, address)) {
		DE_INIT(("install_resident_loader: Failed to write DSP address!\n"));
		goto irl_error;
	}
	/* Write out this block of code to the DSP */
	for (i = 0; i < words; i++) {
		u32 data;

		data = ((u32)code[index] << 16) + code[index + 1];
		if (write_dsp(chip, data)) {
			DE_INIT(("install_resident_loader: Failed to write DSP code\n"));
			goto irl_error;
		}
		index += 2;
	}

	/* Wait for flag 5 to come up */
	for (i = 0; i < 200; i++) {	/* Timeout is 50us * 200 = 10ms */
		udelay(50);
		status = get_dsp_register(chip, CHI32_STATUS_REG);
		if (status & CHI32_STATUS_REG_HF5)
			break;
	}

	if (i == 200) {
		DE_INIT(("Resident loader failed to set HF5\n"));
		goto irl_error;
	}

	DE_INIT(("Resident loader successfully installed\n"));
	free_firmware(fw);
	return 0;

irl_error:
	free_firmware(fw);
	return -EIO;
}

#endif /* DSP_56361 */


static int load_dsp(struct echoaudio *chip, u16 *code)
{
	u32 address, data;
	int index, words, i;

	if (chip->dsp_code == code) {
		DE_INIT(("DSP is already loaded!\n"));
		return 0;
	}
	chip->bad_board = TRUE;		/* Set TRUE until DSP loaded */
	chip->dsp_code = NULL;		/* Current DSP code not loaded */
	chip->asic_loaded = FALSE;	/* Loading the DSP code will reset the ASIC */

	DE_INIT(("load_dsp: Set bad_board to TRUE\n"));

	/* If this board requires a resident loader, install it. */
#ifdef DSP_56361
	if ((i = install_resident_loader(chip)) < 0)
		return i;
#endif

	/* Send software reset command */
	if (send_vector(chip, DSP_VC_RESET) < 0) {
		DE_INIT(("LoadDsp: send_vector DSP_VC_RESET failed, Critical Failure\n"));
		return -EIO;
	}
	/* Delay 10us */
	udelay(10);

	/* Wait 10ms for HF3 to indicate that software reset is complete */
	for (i = 0; i < 1000; i++) {	/* Timeout is 10us * 1000 = 10ms */
		if (get_dsp_register(chip, CHI32_STATUS_REG) &
		    CHI32_STATUS_REG_HF3)
			break;
		udelay(10);
	}

	if (i == 1000) {
		DE_INIT(("load_dsp: Timeout waiting for CHI32_STATUS_REG_HF3\n"));
		return -EIO;
	}

	/* Set DSP format bits for 24 bit mode now that soft reset is done */
	set_dsp_register(chip, CHI32_CONTROL_REG,
			 get_dsp_register(chip, CHI32_CONTROL_REG) | 0x900);

	/* Main loader loop */

	index = code[0];
	for (;;) {
		int block_type, mem_type;

		/* Total Block Size */
		index++;

		/* Block Type */
		block_type = code[index];
		if (block_type == 4)	/* We're finished */
			break;

		index++;

		/* Memory Type  P=0,X=1,Y=2 */
		mem_type = code[index++];

		/* Block Code Size */
		words = code[index++];
		if (words == 0)		/* We're finished */
			break;

		/* Start Address */
		address = ((u32)code[index] << 16) + code[index + 1];
		index += 2;

		if (write_dsp(chip, words) < 0) {
			DE_INIT(("load_dsp: failed to write number of DSP words\n"));
			return -EIO;
		}
		if (write_dsp(chip, address) < 0) {
			DE_INIT(("load_dsp: failed to write DSP address\n"));
			return -EIO;
		}
		if (write_dsp(chip, mem_type) < 0) {
			DE_INIT(("load_dsp: failed to write DSP memory type\n"));
			return -EIO;
		}
		/* Code */
		for (i = 0; i < words; i++, index+=2) {
			data = ((u32)code[index] << 16) + code[index + 1];
			if (write_dsp(chip, data) < 0) {
				DE_INIT(("load_dsp: failed to write DSP data\n"));
				return -EIO;
			}
		}
	}

	if (write_dsp(chip, 0) < 0) {	/* We're done!!! */
		DE_INIT(("load_dsp: Failed to write final zero\n"));
		return -EIO;
	}
	udelay(10);

	for (i = 0; i < 5000; i++) {	/* Timeout is 100us * 5000 = 500ms */
		/* Wait for flag 4 - indicates that the DSP loaded OK */
		if (get_dsp_register(chip, CHI32_STATUS_REG) &
		    CHI32_STATUS_REG_HF4) {
			set_dsp_register(chip, CHI32_CONTROL_REG,
					 get_dsp_register(chip, CHI32_CONTROL_REG) & ~0x1b00);

			if (write_dsp(chip, DSP_FNC_SET_COMMPAGE_ADDR) < 0) {
				DE_INIT(("load_dsp: Failed to write DSP_FNC_SET_COMMPAGE_ADDR\n"));
				return -EIO;
			}

			if (write_dsp(chip, chip->comm_page_phys) < 0) {
				DE_INIT(("load_dsp: Failed to write comm page address\n"));
				return -EIO;
			}

			/* Get the serial number via slave mode.
			This is triggered by the SET_COMMPAGE_ADDR command.
			We don't actually use the serial number but we have to
			get it as part of the DSP init voodoo. */
			if (read_sn(chip) < 0) {
				DE_INIT(("load_dsp: Failed to read serial number\n"));
				return -EIO;
			}

			chip->dsp_code = code;		/* Show which DSP code loaded */
			chip->bad_board = FALSE;	/* DSP OK */
			DE_INIT(("load_dsp: OK!\n"));
			return 0;
		}
		udelay(100);
	}

	DE_INIT(("load_dsp: DSP load timed out waiting for HF4\n"));
	return -EIO;
}



/* load_firmware takes care of loading the DSP and any ASIC code. */
static int load_firmware(struct echoaudio *chip)
{
	const struct firmware *fw;
	int box_type, err;

	if (snd_BUG_ON(!chip->comm_page))
		return -EPERM;

	/* See if the ASIC is present and working - only if the DSP is already loaded */
	if (chip->dsp_code) {
		if ((box_type = check_asic_status(chip)) >= 0)
			return box_type;
		/* ASIC check failed; force the DSP to reload */
		chip->dsp_code = NULL;
	}

	err = get_firmware(&fw, chip, chip->dsp_code_to_load);
	if (err < 0)
		return err;
	err = load_dsp(chip, (u16 *)fw->data);
	free_firmware(fw);
	if (err < 0)
		return err;

	if ((box_type = load_asic(chip)) < 0)
		return box_type;	/* error */

	return box_type;
}



/****************************************************************************
	Mixer functions
 ****************************************************************************/

#if defined(ECHOCARD_HAS_INPUT_NOMINAL_LEVEL) || \
	defined(ECHOCARD_HAS_OUTPUT_NOMINAL_LEVEL)

/* Set the nominal level for an input or output bus (true = -10dBV, false = +4dBu) */
static int set_nominal_level(struct echoaudio *chip, u16 index, char consumer)
{
	if (snd_BUG_ON(index >= num_busses_out(chip) + num_busses_in(chip)))
		return -EINVAL;

	/* Wait for the handshake (OK even if ASIC is not loaded) */
	if (wait_handshake(chip))
		return -EIO;

	chip->nominal_level[index] = consumer;

	if (consumer)
		chip->comm_page->nominal_level_mask |= cpu_to_le32(1 << index);
	else
		chip->comm_page->nominal_level_mask &= ~cpu_to_le32(1 << index);

	return 0;
}

#endif /* ECHOCARD_HAS_*_NOMINAL_LEVEL */



/* Set the gain for a single physical output channel (dB). */
static int set_output_gain(struct echoaudio *chip, u16 channel, s8 gain)
{
	if (snd_BUG_ON(channel >= num_busses_out(chip)))
		return -EINVAL;

	if (wait_handshake(chip))
		return -EIO;

	/* Save the new value */
	chip->output_gain[channel] = gain;
	chip->comm_page->line_out_level[channel] = gain;
	return 0;
}



#ifdef ECHOCARD_HAS_MONITOR
/* Set the monitor level from an input bus to an output bus. */
static int set_monitor_gain(struct echoaudio *chip, u16 output, u16 input,
			    s8 gain)
{
	if (snd_BUG_ON(output >= num_busses_out(chip) ||
		    input >= num_busses_in(chip)))
		return -EINVAL;

	if (wait_handshake(chip))
		return -EIO;

	chip->monitor_gain[output][input] = gain;
	chip->comm_page->monitors[monitor_index(chip, output, input)] = gain;
	return 0;
}
#endif /* ECHOCARD_HAS_MONITOR */


/* Tell the DSP to read and update output, nominal & monitor levels in comm page. */
static int update_output_line_level(struct echoaudio *chip)
{
	if (wait_handshake(chip))
		return -EIO;
	clear_handshake(chip);
	return send_vector(chip, DSP_VC_UPDATE_OUTVOL);
}



/* Tell the DSP to read and update input levels in comm page */
static int update_input_line_level(struct echoaudio *chip)
{
	if (wait_handshake(chip))
		return -EIO;
	clear_handshake(chip);
	return send_vector(chip, DSP_VC_UPDATE_INGAIN);
}



/* set_meters_on turns the meters on or off.  If meters are turned on, the DSP
will write the meter and clock detect values to the comm page at about 30Hz */
static void set_meters_on(struct echoaudio *chip, char on)
{
	if (on && !chip->meters_enabled) {
		send_vector(chip, DSP_VC_METERS_ON);
		chip->meters_enabled = 1;
	} else if (!on && chip->meters_enabled) {
		send_vector(chip, DSP_VC_METERS_OFF);
		chip->meters_enabled = 0;
		memset((s8 *)chip->comm_page->vu_meter, ECHOGAIN_MUTED,
		       DSP_MAXPIPES);
		memset((s8 *)chip->comm_page->peak_meter, ECHOGAIN_MUTED,
		       DSP_MAXPIPES);
	}
}



/* Fill out an the given array using the current values in the comm page.
Meters are written in the comm page by the DSP in this order:
 Output busses
 Input busses
 Output pipes (vmixer cards only)

This function assumes there are no more than 16 in/out busses or pipes
Meters is an array [3][16][2] of long. */
static void get_audio_meters(struct echoaudio *chip, long *meters)
{
	int i, m, n;

	m = 0;
	n = 0;
	for (i = 0; i < num_busses_out(chip); i++, m++) {
		meters[n++] = chip->comm_page->vu_meter[m];
		meters[n++] = chip->comm_page->peak_meter[m];
	}
	for (; n < 32; n++)
		meters[n] = 0;

#ifdef ECHOCARD_ECHO3G
	m = E3G_MAX_OUTPUTS;	/* Skip unused meters */
#endif

	for (i = 0; i < num_busses_in(chip); i++, m++) {
		meters[n++] = chip->comm_page->vu_meter[m];
		meters[n++] = chip->comm_page->peak_meter[m];
	}
	for (; n < 64; n++)
		meters[n] = 0;

#ifdef ECHOCARD_HAS_VMIXER
	for (i = 0; i < num_pipes_out(chip); i++, m++) {
		meters[n++] = chip->comm_page->vu_meter[m];
		meters[n++] = chip->comm_page->peak_meter[m];
	}
#endif
	for (; n < 96; n++)
		meters[n] = 0;
}



static int restore_dsp_rettings(struct echoaudio *chip)
{
	int i, o, err;
	DE_INIT(("restore_dsp_settings\n"));

	if ((err = check_asic_status(chip)) < 0)
		return err;

	/* Gina20/Darla20 only. Should be harmless for other cards. */
	chip->comm_page->gd_clock_state = GD_CLOCK_UNDEF;
	chip->comm_page->gd_spdif_status = GD_SPDIF_STATUS_UNDEF;
	chip->comm_page->handshake = 0xffffffff;

	/* Restore output busses */
	for (i = 0; i < num_busses_out(chip); i++) {
		err = set_output_gain(chip, i, chip->output_gain[i]);
		if (err < 0)
			return err;
	}

#ifdef ECHOCARD_HAS_VMIXER
	for (i = 0; i < num_pipes_out(chip); i++)
		for (o = 0; o < num_busses_out(chip); o++) {
			err = set_vmixer_gain(chip, o, i,
						chip->vmixer_gain[o][i]);
			if (err < 0)
				return err;
		}
	if (update_vmixer_level(chip) < 0)
		return -EIO;
#endif /* ECHOCARD_HAS_VMIXER */

#ifdef ECHOCARD_HAS_MONITOR
	for (o = 0; o < num_busses_out(chip); o++)
		for (i = 0; i < num_busses_in(chip); i++) {
			err = set_monitor_gain(chip, o, i,
						chip->monitor_gain[o][i]);
			if (err < 0)
				return err;
		}
#endif /* ECHOCARD_HAS_MONITOR */

#ifdef ECHOCARD_HAS_INPUT_GAIN
	for (i = 0; i < num_busses_in(chip); i++) {
		err = set_input_gain(chip, i, chip->input_gain[i]);
		if (err < 0)
			return err;
	}
#endif /* ECHOCARD_HAS_INPUT_GAIN */

	err = update_output_line_level(chip);
	if (err < 0)
		return err;

	err = update_input_line_level(chip);
	if (err < 0)
		return err;

	err = set_sample_rate(chip, chip->sample_rate);
	if (err < 0)
		return err;

	if (chip->meters_enabled) {
		err = send_vector(chip, DSP_VC_METERS_ON);
		if (err < 0)
			return err;
	}

#ifdef ECHOCARD_HAS_DIGITAL_MODE_SWITCH
	if (set_digital_mode(chip, chip->digital_mode) < 0)
		return -EIO;
#endif

#ifdef ECHOCARD_HAS_DIGITAL_IO
	if (set_professional_spdif(chip, chip->professional_spdif) < 0)
		return -EIO;
#endif

#ifdef ECHOCARD_HAS_PHANTOM_POWER
	if (set_phantom_power(chip, chip->phantom_power) < 0)
		return -EIO;
#endif

#ifdef ECHOCARD_HAS_EXTERNAL_CLOCK
	/* set_input_clock() also restores automute setting */
	if (set_input_clock(chip, chip->input_clock) < 0)
		return -EIO;
#endif

#ifdef ECHOCARD_HAS_OUTPUT_CLOCK_SWITCH
	if (set_output_clock(chip, chip->output_clock) < 0)
		return -EIO;
#endif

	if (wait_handshake(chip) < 0)
		return -EIO;
	clear_handshake(chip);
	if (send_vector(chip, DSP_VC_UPDATE_FLAGS) < 0)
		return -EIO;

	DE_INIT(("restore_dsp_rettings done\n"));
	return 0;
}



/****************************************************************************
	Transport functions
 ****************************************************************************/

/* set_audio_format() sets the format of the audio data in host memory for
this pipe.  Note that _MS_ (mono-to-stereo) playback modes are not used by ALSA
but they are here because they are just mono while capturing */
static void set_audio_format(struct echoaudio *chip, u16 pipe_index,
			     const struct audioformat *format)
{
	u16 dsp_format;

	dsp_format = DSP_AUDIOFORM_SS_16LE;

	/* Look for super-interleave (no big-endian and 8 bits) */
	if (format->interleave > 2) {
		switch (format->bits_per_sample) {
		case 16:
			dsp_format = DSP_AUDIOFORM_SUPER_INTERLEAVE_16LE;
			break;
		case 24:
			dsp_format = DSP_AUDIOFORM_SUPER_INTERLEAVE_24LE;
			break;
		case 32:
			dsp_format = DSP_AUDIOFORM_SUPER_INTERLEAVE_32LE;
			break;
		}
		dsp_format |= format->interleave;
	} else if (format->data_are_bigendian) {
		/* For big-endian data, only 32 bit samples are supported */
		switch (format->interleave) {
		case 1:
			dsp_format = DSP_AUDIOFORM_MM_32BE;
			break;
#ifdef ECHOCARD_HAS_STEREO_BIG_ENDIAN32
		case 2:
			dsp_format = DSP_AUDIOFORM_SS_32BE;
			break;
#endif
		}
	} else if (format->interleave == 1 &&
		   format->bits_per_sample == 32 && !format->mono_to_stereo) {
		/* 32 bit little-endian mono->mono case */
		dsp_format = DSP_AUDIOFORM_MM_32LE;
	} else {
		/* Handle the other little-endian formats */
		switch (format->bits_per_sample) {
		case 8:
			if (format->interleave == 2)
				dsp_format = DSP_AUDIOFORM_SS_8;
			else
				dsp_format = DSP_AUDIOFORM_MS_8;
			break;
		default:
		case 16:
			if (format->interleave == 2)
				dsp_format = DSP_AUDIOFORM_SS_16LE;
			else
				dsp_format = DSP_AUDIOFORM_MS_16LE;
			break;
		case 24:
			if (format->interleave == 2)
				dsp_format = DSP_AUDIOFORM_SS_24LE;
			else
				dsp_format = DSP_AUDIOFORM_MS_24LE;
			break;
		case 32:
			if (format->interleave == 2)
				dsp_format = DSP_AUDIOFORM_SS_32LE;
			else
				dsp_format = DSP_AUDIOFORM_MS_32LE;
			break;
		}
	}
	DE_ACT(("set_audio_format[%d] = %x\n", pipe_index, dsp_format));
	chip->comm_page->audio_format[pipe_index] = cpu_to_le16(dsp_format);
}



/* start_transport starts transport for a set of pipes.
The bits 1 in channel_mask specify what pipes to start. Only the bit of the
first channel must be set, regardless its interleave.
Same thing for pause_ and stop_ -trasport below. */
static int start_transport(struct echoaudio *chip, u32 channel_mask,
			   u32 cyclic_mask)
{
	DE_ACT(("start_transport %x\n", channel_mask));

	if (wait_handshake(chip))
		return -EIO;

	chip->comm_page->cmd_start |= cpu_to_le32(channel_mask);

	if (chip->comm_page->cmd_start) {
		clear_handshake(chip);
		send_vector(chip, DSP_VC_START_TRANSFER);
		if (wait_handshake(chip))
			return -EIO;
		/* Keep track of which pipes are transporting */
		chip->active_mask |= channel_mask;
		chip->comm_page->cmd_start = 0;
		return 0;
	}

	DE_ACT(("start_transport: No pipes to start!\n"));
	return -EINVAL;
}



static int pause_transport(struct echoaudio *chip, u32 channel_mask)
{
	DE_ACT(("pause_transport %x\n", channel_mask));

	if (wait_handshake(chip))
		return -EIO;

	chip->comm_page->cmd_stop |= cpu_to_le32(channel_mask);
	chip->comm_page->cmd_reset = 0;
	if (chip->comm_page->cmd_stop) {
		clear_handshake(chip);
		send_vector(chip, DSP_VC_STOP_TRANSFER);
		if (wait_handshake(chip))
			return -EIO;
		/* Keep track of which pipes are transporting */
		chip->active_mask &= ~channel_mask;
		chip->comm_page->cmd_stop = 0;
		chip->comm_page->cmd_reset = 0;
		return 0;
	}

	DE_ACT(("pause_transport: No pipes to stop!\n"));
	return 0;
}



static int stop_transport(struct echoaudio *chip, u32 channel_mask)
{
	DE_ACT(("stop_transport %x\n", channel_mask));

	if (wait_handshake(chip))
		return -EIO;

	chip->comm_page->cmd_stop |= cpu_to_le32(channel_mask);
	chip->comm_page->cmd_reset |= cpu_to_le32(channel_mask);
	if (chip->comm_page->cmd_reset) {
		clear_handshake(chip);
		send_vector(chip, DSP_VC_STOP_TRANSFER);
		if (wait_handshake(chip))
			return -EIO;
		/* Keep track of which pipes are transporting */
		chip->active_mask &= ~channel_mask;
		chip->comm_page->cmd_stop = 0;
		chip->comm_page->cmd_reset = 0;
		return 0;
	}

	DE_ACT(("stop_transport: No pipes to stop!\n"));
	return 0;
}



static inline int is_pipe_allocated(struct echoaudio *chip, u16 pipe_index)
{
	return (chip->pipe_alloc_mask & (1 << pipe_index));
}



/* Stops everything and turns off the DSP. All pipes should be already
stopped and unallocated. */
static int rest_in_peace(struct echoaudio *chip)
{
	DE_ACT(("rest_in_peace() open=%x\n", chip->pipe_alloc_mask));

	/* Stops all active pipes (just to be sure) */
	stop_transport(chip, chip->active_mask);

	set_meters_on(chip, FALSE);

#ifdef ECHOCARD_HAS_MIDI
	enable_midi_input(chip, FALSE);
#endif

	/* Go to sleep */
	if (chip->dsp_code) {
		/* Make load_firmware do a complete reload */
		chip->dsp_code = NULL;
		/* Put the DSP to sleep */
		return send_vector(chip, DSP_VC_GO_COMATOSE);
	}
	return 0;
}



/* Fills the comm page with default values */
static int init_dsp_comm_page(struct echoaudio *chip)
{
	/* Check if the compiler added extra padding inside the structure */
	if (offsetof(struct comm_page, midi_output) != 0xbe0) {
		DE_INIT(("init_dsp_comm_page() - Invalid struct comm_page structure\n"));
		return -EPERM;
	}

	/* Init all the basic stuff */
	chip->card_name = ECHOCARD_NAME;
	chip->bad_board = TRUE;	/* Set TRUE until DSP loaded */
	chip->dsp_code = NULL;	/* Current DSP code not loaded */
	chip->asic_loaded = FALSE;
	memset(chip->comm_page, 0, sizeof(struct comm_page));

	/* Init the comm page */
	chip->comm_page->comm_size =
		cpu_to_le32(sizeof(struct comm_page));
	chip->comm_page->handshake = 0xffffffff;
	chip->comm_page->midi_out_free_count =
		cpu_to_le32(DSP_MIDI_OUT_FIFO_SIZE);
	chip->comm_page->sample_rate = cpu_to_le32(44100);

	/* Set line levels so we don't blast any inputs on startup */
	memset(chip->comm_page->monitors, ECHOGAIN_MUTED, MONITOR_ARRAY_SIZE);
	memset(chip->comm_page->vmixer, ECHOGAIN_MUTED, VMIXER_ARRAY_SIZE);

	return 0;
}



/* This function initializes the chip structure with default values, ie. all
 * muted and internal clock source. Then it copies the settings to the DSP.
 * This MUST be called after the DSP is up and running !
 */
static int init_line_levels(struct echoaudio *chip)
{
	DE_INIT(("init_line_levels\n"));
	memset(chip->output_gain, ECHOGAIN_MUTED, sizeof(chip->output_gain));
	memset(chip->input_gain, ECHOGAIN_MUTED, sizeof(chip->input_gain));
	memset(chip->monitor_gain, ECHOGAIN_MUTED, sizeof(chip->monitor_gain));
	memset(chip->vmixer_gain, ECHOGAIN_MUTED, sizeof(chip->vmixer_gain));
	chip->input_clock = ECHO_CLOCK_INTERNAL;
	chip->output_clock = ECHO_CLOCK_WORD;
	chip->sample_rate = 44100;
	return restore_dsp_rettings(chip);
}



/* This is low level part of the interrupt handler.
It returns -1 if the IRQ is not ours, or N>=0 if it is, where N is the number
of midi data in the input queue. */
static int service_irq(struct echoaudio *chip)
{
	int st;

	/* Read the DSP status register and see if this DSP generated this interrupt */
	if (get_dsp_register(chip, CHI32_STATUS_REG) & CHI32_STATUS_IRQ) {
		st = 0;
#ifdef ECHOCARD_HAS_MIDI
		/* Get and parse midi data if present */
		if (chip->comm_page->midi_input[0])	/* The count is at index 0 */
			st = midi_service_irq(chip);	/* Returns how many midi bytes we received */
#endif
		/* Clear the hardware interrupt */
		chip->comm_page->midi_input[0] = 0;
		send_vector(chip, DSP_VC_ACK_INT);
		return st;
	}
	return -1;
}




/******************************************************************************
	Functions for opening and closing pipes
 ******************************************************************************/

/* allocate_pipes is used to reserve audio pipes for your exclusive use.
The call will fail if some pipes are already allocated. */
static int allocate_pipes(struct echoaudio *chip, struct audiopipe *pipe,
			  int pipe_index, int interleave)
{
	int i;
	u32 channel_mask;
	char is_cyclic;

	DE_ACT(("allocate_pipes: ch=%d int=%d\n", pipe_index, interleave));

	if (chip->bad_board)
		return -EIO;

	is_cyclic = 1;	/* This driver uses cyclic buffers only */

	for (channel_mask = i = 0; i < interleave; i++)
		channel_mask |= 1 << (pipe_index + i);
	if (chip->pipe_alloc_mask & channel_mask) {
		DE_ACT(("allocate_pipes: channel already open\n"));
		return -EAGAIN;
	}

	chip->comm_page->position[pipe_index] = 0;
	chip->pipe_alloc_mask |= channel_mask;
	if (is_cyclic)
		chip->pipe_cyclic_mask |= channel_mask;
	pipe->index = pipe_index;
	pipe->interleave = interleave;
	pipe->state = PIPE_STATE_STOPPED;

	/* The counter register is where the DSP writes the 32 bit DMA
	position for a pipe.  The DSP is constantly updating this value as
	it moves data. The DMA counter is in units of bytes, not samples. */
	pipe->dma_counter = &chip->comm_page->position[pipe_index];
	*pipe->dma_counter = 0;
	DE_ACT(("allocate_pipes: ok\n"));
	return pipe_index;
}



static int free_pipes(struct echoaudio *chip, struct audiopipe *pipe)
{
	u32 channel_mask;
	int i;

	DE_ACT(("free_pipes: Pipe %d\n", pipe->index));
	if (snd_BUG_ON(!is_pipe_allocated(chip, pipe->index)))
		return -EINVAL;
	if (snd_BUG_ON(pipe->state != PIPE_STATE_STOPPED))
		return -EINVAL;

	for (channel_mask = i = 0; i < pipe->interleave; i++)
		channel_mask |= 1 << (pipe->index + i);

	chip->pipe_alloc_mask &= ~channel_mask;
	chip->pipe_cyclic_mask &= ~channel_mask;
	return 0;
}



/******************************************************************************
	Functions for managing the scatter-gather list
******************************************************************************/

static int sglist_init(struct echoaudio *chip, struct audiopipe *pipe)
{
	pipe->sglist_head = 0;
	memset(pipe->sgpage.area, 0, PAGE_SIZE);
	chip->comm_page->sglist_addr[pipe->index].addr =
		cpu_to_le32(pipe->sgpage.addr);
	return 0;
}



static int sglist_add_mapping(struct echoaudio *chip, struct audiopipe *pipe,
				dma_addr_t address, size_t length)
{
	int head = pipe->sglist_head;
	struct sg_entry *list = (struct sg_entry *)pipe->sgpage.area;

	if (head < MAX_SGLIST_ENTRIES - 1) {
		list[head].addr = cpu_to_le32(address);
		list[head].size = cpu_to_le32(length);
		pipe->sglist_head++;
	} else {
		DE_ACT(("SGlist: too many fragments\n"));
		return -ENOMEM;
	}
	return 0;
}



static inline int sglist_add_irq(struct echoaudio *chip, struct audiopipe *pipe)
{
	return sglist_add_mapping(chip, pipe, 0, 0);
}



static inline int sglist_wrap(struct echoaudio *chip, struct audiopipe *pipe)
{
	return sglist_add_mapping(chip, pipe, pipe->sgpage.addr, 0);
}