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
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
/*
 *    tape device discipline for 3480/3490 tapes.
 *
 *    Copyright IBM Corp. 2001, 2009
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *		 Tuan Ngo-Anh <ngoanh@de.ibm.com>
 *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
 */

#define KMSG_COMPONENT "tape_34xx"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/bio.h>
#include <linux/workqueue.h>
#include <linux/slab.h>

#define TAPE_DBF_AREA	tape_34xx_dbf

#include "tape.h"
#include "tape_std.h"

/*
 * Pointer to debug area.
 */
debug_info_t *TAPE_DBF_AREA = NULL;
EXPORT_SYMBOL(TAPE_DBF_AREA);

#define TAPE34XX_FMT_3480	0
#define TAPE34XX_FMT_3480_2_XF	1
#define TAPE34XX_FMT_3480_XF	2

struct tape_34xx_block_id {
	unsigned int	wrap		: 1;
	unsigned int	segment		: 7;
	unsigned int	format		: 2;
	unsigned int	block		: 22;
};

/*
 * A list of block ID's is used to faster seek blocks.
 */
struct tape_34xx_sbid {
	struct list_head		list;
	struct tape_34xx_block_id	bid;
};

static void tape_34xx_delete_sbid_from(struct tape_device *, int);

/*
 * Medium sense for 34xx tapes. There is no 'real' medium sense call.
 * So we just do a normal sense.
 */
static void __tape_34xx_medium_sense(struct tape_request *request)
{
	struct tape_device *device = request->device;
	unsigned char *sense;

	if (request->rc == 0) {
		sense = request->cpdata;

		/*
		 * This isn't quite correct. But since INTERVENTION_REQUIRED
		 * means that the drive is 'neither ready nor on-line' it is
		 * only slightly inaccurate to say there is no tape loaded if
		 * the drive isn't online...
		 */
		if (sense[0] & SENSE_INTERVENTION_REQUIRED)
			tape_med_state_set(device, MS_UNLOADED);
		else
			tape_med_state_set(device, MS_LOADED);

		if (sense[1] & SENSE_WRITE_PROTECT)
			device->tape_generic_status |= GMT_WR_PROT(~0);
		else
			device->tape_generic_status &= ~GMT_WR_PROT(~0);
	} else
		DBF_EVENT(4, "tape_34xx: medium sense failed with rc=%d\n",
			request->rc);
	tape_free_request(request);
}

static int tape_34xx_medium_sense(struct tape_device *device)
{
	struct tape_request *request;
	int rc;

	request = tape_alloc_request(1, 32);
	if (IS_ERR(request)) {
		DBF_EXCEPTION(6, "MSEN fail\n");
		return PTR_ERR(request);
	}

	request->op = TO_MSEN;
	tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata);
	rc = tape_do_io_interruptible(device, request);
	__tape_34xx_medium_sense(request);
	return rc;
}

static void tape_34xx_medium_sense_async(struct tape_device *device)
{
	struct tape_request *request;

	request = tape_alloc_request(1, 32);
	if (IS_ERR(request)) {
		DBF_EXCEPTION(6, "MSEN fail\n");
		return;
	}

	request->op = TO_MSEN;
	tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata);
	request->callback = (void *) __tape_34xx_medium_sense;
	request->callback_data = NULL;
	tape_do_io_async(device, request);
}

struct tape_34xx_work {
	struct tape_device	*device;
	enum tape_op		 op;
	struct work_struct	 work;
};

/*
 * These functions are currently used only to schedule a medium_sense for
 * later execution. This is because we get an interrupt whenever a medium
 * is inserted but cannot call tape_do_io* from an interrupt context.
 * Maybe that's useful for other actions we want to start from the
 * interrupt handler.
 * Note: the work handler is called by the system work queue. The tape
 * commands started by the handler need to be asynchrounous, otherwise
 * a deadlock can occur e.g. in case of a deferred cc=1 (see __tape_do_irq).
 */
static void
tape_34xx_work_handler(struct work_struct *work)
{
	struct tape_34xx_work *p =
		container_of(work, struct tape_34xx_work, work);
	struct tape_device *device = p->device;

	switch(p->op) {
		case TO_MSEN:
			tape_34xx_medium_sense_async(device);
			break;
		default:
			DBF_EVENT(3, "T34XX: internal error: unknown work\n");
	}
	tape_put_device(device);
	kfree(p);
}

static int
tape_34xx_schedule_work(struct tape_device *device, enum tape_op op)
{
	struct tape_34xx_work *p;

	if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
		return -ENOMEM;

	INIT_WORK(&p->work, tape_34xx_work_handler);

	p->device = tape_get_device(device);
	p->op     = op;

	schedule_work(&p->work);
	return 0;
}

/*
 * Done Handler is called when dev stat = DEVICE-END (successful operation)
 */
static inline int
tape_34xx_done(struct tape_request *request)
{
	DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);

	switch (request->op) {
		case TO_DSE:
		case TO_RUN:
		case TO_WRI:
		case TO_WTM:
		case TO_ASSIGN:
		case TO_UNASSIGN:
			tape_34xx_delete_sbid_from(request->device, 0);
			break;
		default:
			;
	}
	return TAPE_IO_SUCCESS;
}

static inline int
tape_34xx_erp_failed(struct tape_request *request, int rc)
{
	DBF_EVENT(3, "Error recovery failed for %s (RC=%d)\n",
		  tape_op_verbose[request->op], rc);
	return rc;
}

static inline int
tape_34xx_erp_succeeded(struct tape_request *request)
{
	DBF_EVENT(3, "Error Recovery successful for %s\n",
		  tape_op_verbose[request->op]);
	return tape_34xx_done(request);
}

static inline int
tape_34xx_erp_retry(struct tape_request *request)
{
	DBF_EVENT(3, "xerp retr %s\n", tape_op_verbose[request->op]);
	return TAPE_IO_RETRY;
}

/*
 * This function is called, when no request is outstanding and we get an
 * interrupt
 */
static int
tape_34xx_unsolicited_irq(struct tape_device *device, struct irb *irb)
{
	if (irb->scsw.cmd.dstat == 0x85) { /* READY */
		/* A medium was inserted in the drive. */
		DBF_EVENT(6, "xuud med\n");
		tape_34xx_delete_sbid_from(device, 0);
		tape_34xx_schedule_work(device, TO_MSEN);
	} else {
		DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id);
		tape_dump_sense_dbf(device, NULL, irb);
	}
	return TAPE_IO_SUCCESS;
}

/*
 * Read Opposite Error Recovery Function:
 * Used, when Read Forward does not work
 */
static int
tape_34xx_erp_read_opposite(struct tape_device *device,
			    struct tape_request *request)
{
	if (request->op == TO_RFO) {
		/*
		 * We did read forward, but the data could not be read
		 * *correctly*. We transform the request to a read backward
		 * and try again.
		 */
		tape_std_read_backward(device, request);
		return tape_34xx_erp_retry(request);
	}

	/*
	 * We tried to read forward and backward, but hat no
	 * success -> failed.
	 */
	return tape_34xx_erp_failed(request, -EIO);
}

static int
tape_34xx_erp_bug(struct tape_device *device, struct tape_request *request,
		  struct irb *irb, int no)
{
	if (request->op != TO_ASSIGN) {
		dev_err(&device->cdev->dev, "An unexpected condition %d "
			"occurred in tape error recovery\n", no);
		tape_dump_sense_dbf(device, request, irb);
	}
	return tape_34xx_erp_failed(request, -EIO);
}

/*
 * Handle data overrun between cu and drive. The channel speed might
 * be too slow.
 */
static int
tape_34xx_erp_overrun(struct tape_device *device, struct tape_request *request,
		      struct irb *irb)
{
	if (irb->ecw[3] == 0x40) {
		dev_warn (&device->cdev->dev, "A data overrun occurred between"
			" the control unit and tape unit\n");
		return tape_34xx_erp_failed(request, -EIO);
	}
	return tape_34xx_erp_bug(device, request, irb, -1);
}

/*
 * Handle record sequence error.
 */
static int
tape_34xx_erp_sequence(struct tape_device *device,
		       struct tape_request *request, struct irb *irb)
{
	if (irb->ecw[3] == 0x41) {
		/*
		 * cu detected incorrect block-id sequence on tape.
		 */
		dev_warn (&device->cdev->dev, "The block ID sequence on the "
			"tape is incorrect\n");
		return tape_34xx_erp_failed(request, -EIO);
	}
	/*
	 * Record sequence error bit is set, but erpa does not
	 * show record sequence error.
	 */
	return tape_34xx_erp_bug(device, request, irb, -2);
}

/*
 * This function analyses the tape's sense-data in case of a unit-check.
 * If possible, it tries to recover from the error. Else the user is
 * informed about the problem.
 */
static int
tape_34xx_unit_check(struct tape_device *device, struct tape_request *request,
		     struct irb *irb)
{
	int inhibit_cu_recovery;
	__u8* sense;

	inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0;
	sense = irb->ecw;

	if (
		sense[0] & SENSE_COMMAND_REJECT &&
		sense[1] & SENSE_WRITE_PROTECT
	) {
		if (
			request->op == TO_DSE ||
			request->op == TO_WRI ||
			request->op == TO_WTM
		) {
			/* medium is write protected */
			return tape_34xx_erp_failed(request, -EACCES);
		} else {
			return tape_34xx_erp_bug(device, request, irb, -3);
		}
	}

	/*
	 * Special cases for various tape-states when reaching
	 * end of recorded area
	 *
	 * FIXME: Maybe a special case of the special case:
	 *        sense[0] == SENSE_EQUIPMENT_CHECK &&
	 *        sense[1] == SENSE_DRIVE_ONLINE    &&
	 *        sense[3] == 0x47 (Volume Fenced)
	 *
	 *        This was caused by continued FSF or FSR after an
	 *        'End Of Data'.
	 */
	if ((
		sense[0] == SENSE_DATA_CHECK      ||
		sense[0] == SENSE_EQUIPMENT_CHECK ||
		sense[0] == SENSE_EQUIPMENT_CHECK + SENSE_DEFERRED_UNIT_CHECK
	) && (
		sense[1] == SENSE_DRIVE_ONLINE ||
		sense[1] == SENSE_BEGINNING_OF_TAPE + SENSE_WRITE_MODE
	)) {
		switch (request->op) {
		/*
		 * sense[0] == SENSE_DATA_CHECK   &&
		 * sense[1] == SENSE_DRIVE_ONLINE
		 * sense[3] == 0x36 (End Of Data)
		 *
		 * Further seeks might return a 'Volume Fenced'.
		 */
		case TO_FSF:
		case TO_FSB:
			/* Trying to seek beyond end of recorded area */
			return tape_34xx_erp_failed(request, -ENOSPC);
		case TO_BSB:
			return tape_34xx_erp_retry(request);

		/*
		 * sense[0] == SENSE_DATA_CHECK   &&
		 * sense[1] == SENSE_DRIVE_ONLINE &&
		 * sense[3] == 0x36 (End Of Data)
		 */
		case TO_LBL:
			/* Block could not be located. */
			tape_34xx_delete_sbid_from(device, 0);
			return tape_34xx_erp_failed(request, -EIO);

		case TO_RFO:
			/* Read beyond end of recorded area -> 0 bytes read */
			return tape_34xx_erp_failed(request, 0);

		/*
		 * sense[0] == SENSE_EQUIPMENT_CHECK &&
		 * sense[1] == SENSE_DRIVE_ONLINE    &&
		 * sense[3] == 0x38 (Physical End Of Volume)
		 */
		case TO_WRI:
			/* Writing at physical end of volume */
			return tape_34xx_erp_failed(request, -ENOSPC);
		default:
			return tape_34xx_erp_failed(request, 0);
		}
	}

	/* Sensing special bits */
	if (sense[0] & SENSE_BUS_OUT_CHECK)
		return tape_34xx_erp_retry(request);

	if (sense[0] & SENSE_DATA_CHECK) {
		/*
		 * hardware failure, damaged tape or improper
		 * operating conditions
		 */
		switch (sense[3]) {
		case 0x23:
			/* a read data check occurred */
			if ((sense[2] & SENSE_TAPE_SYNC_MODE) ||
			    inhibit_cu_recovery)
				// data check is not permanent, may be
				// recovered. We always use async-mode with
				// cu-recovery, so this should *never* happen.
				return tape_34xx_erp_bug(device, request,
							 irb, -4);

			/* data check is permanent, CU recovery has failed */
			dev_warn (&device->cdev->dev, "A read error occurred "
				"that cannot be recovered\n");
			return tape_34xx_erp_failed(request, -EIO);
		case 0x25:
			// a write data check occurred
			if ((sense[2] & SENSE_TAPE_SYNC_MODE) ||
			    inhibit_cu_recovery)
				// data check is not permanent, may be
				// recovered. We always use async-mode with
				// cu-recovery, so this should *never* happen.
				return tape_34xx_erp_bug(device, request,
							 irb, -5);

			// data check is permanent, cu-recovery has failed
			dev_warn (&device->cdev->dev, "A write error on the "
				"tape cannot be recovered\n");
			return tape_34xx_erp_failed(request, -EIO);
		case 0x26:
			/* Data Check (read opposite) occurred. */
			return tape_34xx_erp_read_opposite(device, request);
		case 0x28:
			/* ID-Mark at tape start couldn't be written */
			dev_warn (&device->cdev->dev, "Writing the ID-mark "
				"failed\n");
			return tape_34xx_erp_failed(request, -EIO);
		case 0x31:
			/* Tape void. Tried to read beyond end of device. */
			dev_warn (&device->cdev->dev, "Reading the tape beyond"
				" the end of the recorded area failed\n");
			return tape_34xx_erp_failed(request, -ENOSPC);
		case 0x41:
			/* Record sequence error. */
			dev_warn (&device->cdev->dev, "The tape contains an "
				"incorrect block ID sequence\n");
			return tape_34xx_erp_failed(request, -EIO);
		default:
			/* all data checks for 3480 should result in one of
			 * the above erpa-codes. For 3490, other data-check
			 * conditions do exist. */
			if (device->cdev->id.driver_info == tape_3480)
				return tape_34xx_erp_bug(device, request,
							 irb, -6);
		}
	}

	if (sense[0] & SENSE_OVERRUN)
		return tape_34xx_erp_overrun(device, request, irb);

	if (sense[1] & SENSE_RECORD_SEQUENCE_ERR)
		return tape_34xx_erp_sequence(device, request, irb);

	/* Sensing erpa codes */
	switch (sense[3]) {
	case 0x00:
		/* Unit check with erpa code 0. Report and ignore. */
		return TAPE_IO_SUCCESS;
	case 0x21:
		/*
		 * Data streaming not operational. CU will switch to
		 * interlock mode. Reissue the command.
		 */
		return tape_34xx_erp_retry(request);
	case 0x22:
		/*
		 * Path equipment check. Might be drive adapter error, buffer
		 * error on the lower interface, internal path not usable,
		 * or error during cartridge load.
		 */
		dev_warn (&device->cdev->dev, "A path equipment check occurred"
			" for the tape device\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x24:
		/*
		 * Load display check. Load display was command was issued,
		 * but the drive is displaying a drive check message. Can
		 * be threated as "device end".
		 */
		return tape_34xx_erp_succeeded(request);
	case 0x27:
		/*
		 * Command reject. May indicate illegal channel program or
		 * buffer over/underrun. Since all channel programs are
		 * issued by this driver and ought be correct, we assume a
		 * over/underrun situation and retry the channel program.
		 */
		return tape_34xx_erp_retry(request);
	case 0x29:
		/*
		 * Function incompatible. Either the tape is idrc compressed
		 * but the hardware isn't capable to do idrc, or a perform
		 * subsystem func is issued and the CU is not on-line.
		 */
		return tape_34xx_erp_failed(request, -EIO);
	case 0x2a:
		/*
		 * Unsolicited environmental data. An internal counter
		 * overflows, we can ignore this and reissue the cmd.
		 */
		return tape_34xx_erp_retry(request);
	case 0x2b:
		/*
		 * Environmental data present. Indicates either unload
		 * completed ok or read buffered log command completed ok.
		 */
		if (request->op == TO_RUN) {
			/* Rewind unload completed ok. */
			tape_med_state_set(device, MS_UNLOADED);
			return tape_34xx_erp_succeeded(request);
		}
		/* tape_34xx doesn't use read buffered log commands. */
		return tape_34xx_erp_bug(device, request, irb, sense[3]);
	case 0x2c:
		/*
		 * Permanent equipment check. CU has tried recovery, but
		 * did not succeed.
		 */
		return tape_34xx_erp_failed(request, -EIO);
	case 0x2d:
		/* Data security erase failure. */
		if (request->op == TO_DSE)
			return tape_34xx_erp_failed(request, -EIO);
		/* Data security erase failure, but no such command issued. */
		return tape_34xx_erp_bug(device, request, irb, sense[3]);
	case 0x2e:
		/*
		 * Not capable. This indicates either that the drive fails
		 * reading the format id mark or that that format specified
		 * is not supported by the drive.
		 */
		dev_warn (&device->cdev->dev, "The tape unit cannot process "
			"the tape format\n");
		return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
	case 0x30:
		/* The medium is write protected. */
		dev_warn (&device->cdev->dev, "The tape medium is write-"
			"protected\n");
		return tape_34xx_erp_failed(request, -EACCES);
	case 0x32:
		// Tension loss. We cannot recover this, it's an I/O error.
		dev_warn (&device->cdev->dev, "The tape does not have the "
			"required tape tension\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x33:
		/*
		 * Load Failure. The cartridge was not inserted correctly or
		 * the tape is not threaded correctly.
		 */
		dev_warn (&device->cdev->dev, "The tape unit failed to load"
			" the cartridge\n");
		tape_34xx_delete_sbid_from(device, 0);
		return tape_34xx_erp_failed(request, -EIO);
	case 0x34:
		/*
		 * Unload failure. The drive cannot maintain tape tension
		 * and control tape movement during an unload operation.
		 */
		dev_warn (&device->cdev->dev, "Automatic unloading of the tape"
			" cartridge failed\n");
		if (request->op == TO_RUN)
			return tape_34xx_erp_failed(request, -EIO);
		return tape_34xx_erp_bug(device, request, irb, sense[3]);
	case 0x35:
		/*
		 * Drive equipment check. One of the following:
		 * - cu cannot recover from a drive detected error
		 * - a check code message is shown on drive display
		 * - the cartridge loader does not respond correctly
		 * - a failure occurs during an index, load, or unload cycle
		 */
		dev_warn (&device->cdev->dev, "An equipment check has occurred"
			" on the tape unit\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x36:
		if (device->cdev->id.driver_info == tape_3490)
			/* End of data. */
			return tape_34xx_erp_failed(request, -EIO);
		/* This erpa is reserved for 3480 */
		return tape_34xx_erp_bug(device, request, irb, sense[3]);
	case 0x37:
		/*
		 * Tape length error. The tape is shorter than reported in
		 * the beginning-of-tape data.
		 */
		dev_warn (&device->cdev->dev, "The tape information states an"
			" incorrect length\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x38:
		/*
		 * Physical end of tape. A read/write operation reached
		 * the physical end of tape.
		 */
		if (request->op==TO_WRI ||
		    request->op==TO_DSE ||
		    request->op==TO_WTM)
			return tape_34xx_erp_failed(request, -ENOSPC);
		return tape_34xx_erp_failed(request, -EIO);
	case 0x39:
		/* Backward at Beginning of tape. */
		return tape_34xx_erp_failed(request, -EIO);
	case 0x3a:
		/* Drive switched to not ready. */
		dev_warn (&device->cdev->dev, "The tape unit is not ready\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x3b:
		/* Manual rewind or unload. This causes an I/O error. */
		dev_warn (&device->cdev->dev, "The tape medium has been "
			"rewound or unloaded manually\n");
		tape_34xx_delete_sbid_from(device, 0);
		return tape_34xx_erp_failed(request, -EIO);
	case 0x42:
		/*
		 * Degraded mode. A condition that can cause degraded
		 * performance is detected.
		 */
		dev_warn (&device->cdev->dev, "The tape subsystem is running "
			"in degraded mode\n");
		return tape_34xx_erp_retry(request);
	case 0x43:
		/* Drive not ready. */
		tape_34xx_delete_sbid_from(device, 0);
		tape_med_state_set(device, MS_UNLOADED);
		/* Some commands commands are successful even in this case */
		if (sense[1] & SENSE_DRIVE_ONLINE) {
			switch(request->op) {
				case TO_ASSIGN:
				case TO_UNASSIGN:
				case TO_DIS:
				case TO_NOP:
					return tape_34xx_done(request);
					break;
				default:
					break;
			}
		}
		return tape_34xx_erp_failed(request, -ENOMEDIUM);
	case 0x44:
		/* Locate Block unsuccessful. */
		if (request->op != TO_BLOCK && request->op != TO_LBL)
			/* No locate block was issued. */
			return tape_34xx_erp_bug(device, request,
						 irb, sense[3]);
		return tape_34xx_erp_failed(request, -EIO);
	case 0x45:
		/* The drive is assigned to a different channel path. */
		dev_warn (&device->cdev->dev, "The tape unit is already "
			"assigned\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x46:
		/*
		 * Drive not on-line. Drive may be switched offline,
		 * the power supply may be switched off or
		 * the drive address may not be set correctly.
		 */
		dev_warn (&device->cdev->dev, "The tape unit is not online\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x47:
		/* Volume fenced. CU reports volume integrity is lost. */
		dev_warn (&device->cdev->dev, "The control unit has fenced "
			"access to the tape volume\n");
		tape_34xx_delete_sbid_from(device, 0);
		return tape_34xx_erp_failed(request, -EIO);
	case 0x48:
		/* Log sense data and retry request. */
		return tape_34xx_erp_retry(request);
	case 0x49:
		/* Bus out check. A parity check error on the bus was found. */
		dev_warn (&device->cdev->dev, "A parity error occurred on the "
			"tape bus\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x4a:
		/* Control unit erp failed. */
		dev_warn (&device->cdev->dev, "I/O error recovery failed on "
			"the tape control unit\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x4b:
		/*
		 * CU and drive incompatible. The drive requests micro-program
		 * patches, which are not available on the CU.
		 */
		dev_warn (&device->cdev->dev, "The tape unit requires a "
			"firmware update\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x4c:
		/*
		 * Recovered Check-One failure. Cu develops a hardware error,
		 * but is able to recover.
		 */
		return tape_34xx_erp_retry(request);
	case 0x4d:
		if (device->cdev->id.driver_info == tape_3490)
			/*
			 * Resetting event received. Since the driver does
			 * not support resetting event recovery (which has to
			 * be handled by the I/O Layer), retry our command.
			 */
			return tape_34xx_erp_retry(request);
		/* This erpa is reserved for 3480. */
		return tape_34xx_erp_bug(device, request, irb, sense[3]);
	case 0x4e:
		if (device->cdev->id.driver_info == tape_3490) {
			/*
			 * Maximum block size exceeded. This indicates, that
			 * the block to be written is larger than allowed for
			 * buffered mode.
			 */
			dev_warn (&device->cdev->dev, "The maximum block size"
				" for buffered mode is exceeded\n");
			return tape_34xx_erp_failed(request, -ENOBUFS);
		}
		/* This erpa is reserved for 3480. */
		return tape_34xx_erp_bug(device, request, irb, sense[3]);
	case 0x50:
		/*
		 * Read buffered log (Overflow). CU is running in extended
		 * buffered log mode, and a counter overflows. This should
		 * never happen, since we're never running in extended
		 * buffered log mode.
		 */
		return tape_34xx_erp_retry(request);
	case 0x51:
		/*
		 * Read buffered log (EOV). EOF processing occurs while the
		 * CU is in extended buffered log mode. This should never
		 * happen, since we're never running in extended buffered
		 * log mode.
		 */
		return tape_34xx_erp_retry(request);
	case 0x52:
		/* End of Volume complete. Rewind unload completed ok. */
		if (request->op == TO_RUN) {
			tape_med_state_set(device, MS_UNLOADED);
			tape_34xx_delete_sbid_from(device, 0);
			return tape_34xx_erp_succeeded(request);
		}
		return tape_34xx_erp_bug(device, request, irb, sense[3]);
	case 0x53:
		/* Global command intercept. */
		return tape_34xx_erp_retry(request);
	case 0x54:
		/* Channel interface recovery (temporary). */
		return tape_34xx_erp_retry(request);
	case 0x55:
		/* Channel interface recovery (permanent). */
		dev_warn (&device->cdev->dev, "A channel interface error cannot be"
			" recovered\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x56:
		/* Channel protocol error. */
		dev_warn (&device->cdev->dev, "A channel protocol error "
			"occurred\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x57:
		/*
		 * 3480: Attention intercept.
		 * 3490: Global status intercept.
		 */
		return tape_34xx_erp_retry(request);
	case 0x5a:
		/*
		 * Tape length incompatible. The tape inserted is too long,
		 * which could cause damage to the tape or the drive.
		 */
		dev_warn (&device->cdev->dev, "The tape unit does not support "
			"the tape length\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x5b:
		/* Format 3480 XF incompatible */
		if (sense[1] & SENSE_BEGINNING_OF_TAPE)
			/* The tape will get overwritten. */
			return tape_34xx_erp_retry(request);
		dev_warn (&device->cdev->dev, "The tape unit does not support"
			" format 3480 XF\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x5c:
		/* Format 3480-2 XF incompatible */
		dev_warn (&device->cdev->dev, "The tape unit does not support tape "
			"format 3480-2 XF\n");
		return tape_34xx_erp_failed(request, -EIO);
	case 0x5d:
		/* Tape length violation. */
		dev_warn (&device->cdev->dev, "The tape unit does not support"
			" the current tape length\n");
		return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
	case 0x5e:
		/* Compaction algorithm incompatible. */
		dev_warn (&device->cdev->dev, "The tape unit does not support"
			" the compaction algorithm\n");
		return tape_34xx_erp_failed(request, -EMEDIUMTYPE);

		/* The following erpas should have been covered earlier. */
	case 0x23: /* Read data check. */
	case 0x25: /* Write data check. */
	case 0x26: /* Data check (read opposite). */
	case 0x28: /* Write id mark check. */
	case 0x31: /* Tape void. */
	case 0x40: /* Overrun error. */
	case 0x41: /* Record sequence error. */
		/* All other erpas are reserved for future use. */
	default:
		return tape_34xx_erp_bug(device, request, irb, sense[3]);
	}
}

/*
 * 3480/3490 interrupt handler
 */
static int
tape_34xx_irq(struct tape_device *device, struct tape_request *request,
	      struct irb *irb)
{
	if (request == NULL)
		return tape_34xx_unsolicited_irq(device, irb);

	if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) &&
	    (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) &&
	    (request->op == TO_WRI)) {
		/* Write at end of volume */
		return tape_34xx_erp_failed(request, -ENOSPC);
	}

	if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
		return tape_34xx_unit_check(device, request, irb);

	if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
		/*
		 * A unit exception occurs on skipping over a tapemark block.
		 */
		if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
			if (request->op == TO_BSB || request->op == TO_FSB)
				request->rescnt++;
			else
				DBF_EVENT(5, "Unit Exception!\n");
		}
		return tape_34xx_done(request);
	}

	DBF_EVENT(6, "xunknownirq\n");
	tape_dump_sense_dbf(device, request, irb);
	return TAPE_IO_STOP;
}

/*
 * ioctl_overload
 */
static int
tape_34xx_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
{
	if (cmd == TAPE390_DISPLAY) {
		struct display_struct disp;

		if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)) != 0)
			return -EFAULT;

		return tape_std_display(device, &disp);
	} else
		return -EINVAL;
}

static inline void
tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l)
{
	struct tape_34xx_sbid *	new_sbid;

	new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC);
	if (!new_sbid)
		return;

	new_sbid->bid = bid;
	list_add(&new_sbid->list, l);
}

/*
 * Build up the search block ID list. The block ID consists of a logical
 * block number and a hardware specific part. The hardware specific part
 * helps the tape drive to speed up searching for a specific block.
 */
static void
tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid)
{
	struct list_head *	sbid_list;
	struct tape_34xx_sbid *	sbid;
	struct list_head *	l;

	/*
	 * immediately return if there is no list at all or the block to add
	 * is located in segment 1 of wrap 0 because this position is used
	 * if no hardware position data is supplied.
	 */
	sbid_list = (struct list_head *) device->discdata;
	if (!sbid_list || (bid.segment < 2 && bid.wrap == 0))
		return;

	/*
	 * Search the position where to insert the new entry. Hardware
	 * acceleration uses only the segment and wrap number. So we
	 * need only one entry for a specific wrap/segment combination.
	 * If there is a block with a lower number but the same hard-
	 * ware position data we just update the block number in the
	 * existing entry.
	 */
	list_for_each(l, sbid_list) {
		sbid = list_entry(l, struct tape_34xx_sbid, list);

		if (
			(sbid->bid.segment == bid.segment) &&
			(sbid->bid.wrap    == bid.wrap)
		) {
			if (bid.block < sbid->bid.block)
				sbid->bid = bid;
			else return;
			break;
		}

		/* Sort in according to logical block number. */
		if (bid.block < sbid->bid.block) {
			tape_34xx_append_new_sbid(bid, l->prev);
			break;
		}
	}
	/* List empty or new block bigger than last entry. */
	if (l == sbid_list)
		tape_34xx_append_new_sbid(bid, l->prev);

	DBF_LH(4, "Current list is:\n");
	list_for_each(l, sbid_list) {
		sbid = list_entry(l, struct tape_34xx_sbid, list);
		DBF_LH(4, "%d:%03d@%05d\n",
			sbid->bid.wrap,
			sbid->bid.segment,
			sbid->bid.block
		);
	}
}

/*
 * Delete all entries from the search block ID list that belong to tape blocks
 * equal or higher than the given number.
 */
static void
tape_34xx_delete_sbid_from(struct tape_device *device, int from)
{
	struct list_head *	sbid_list;
	struct tape_34xx_sbid *	sbid;
	struct list_head *	l;
	struct list_head *	n;

	sbid_list = (struct list_head *) device->discdata;
	if (!sbid_list)
		return;

	list_for_each_safe(l, n, sbid_list) {
		sbid = list_entry(l, struct tape_34xx_sbid, list);
		if (sbid->bid.block >= from) {
			DBF_LH(4, "Delete sbid %d:%03d@%05d\n",
				sbid->bid.wrap,
				sbid->bid.segment,
				sbid->bid.block
			);
			list_del(l);
			kfree(sbid);
		}
	}
}

/*
 * Merge hardware position data into a block id.
 */
static void
tape_34xx_merge_sbid(
	struct tape_device *		device,
	struct tape_34xx_block_id *	bid
) {
	struct tape_34xx_sbid *	sbid;
	struct tape_34xx_sbid *	sbid_to_use;
	struct list_head *	sbid_list;
	struct list_head *	l;

	sbid_list = (struct list_head *) device->discdata;
	bid->wrap    = 0;
	bid->segment = 1;

	if (!sbid_list || list_empty(sbid_list))
		return;

	sbid_to_use = NULL;
	list_for_each(l, sbid_list) {
		sbid = list_entry(l, struct tape_34xx_sbid, list);

		if (sbid->bid.block >= bid->block)
			break;
		sbid_to_use = sbid;
	}
	if (sbid_to_use) {
		bid->wrap    = sbid_to_use->bid.wrap;
		bid->segment = sbid_to_use->bid.segment;
		DBF_LH(4, "Use %d:%03d@%05d for %05d\n",
			sbid_to_use->bid.wrap,
			sbid_to_use->bid.segment,
			sbid_to_use->bid.block,
			bid->block
		);
	}
}

static int
tape_34xx_setup_device(struct tape_device * device)
{
	int			rc;
	struct list_head *	discdata;

	DBF_EVENT(6, "34xx device setup\n");
	if ((rc = tape_std_assign(device)) == 0) {
		if ((rc = tape_34xx_medium_sense(device)) != 0) {
			DBF_LH(3, "34xx medium sense returned %d\n", rc);
		}
	}
	discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL);
	if (discdata) {
			INIT_LIST_HEAD(discdata);
			device->discdata = discdata;
	}

	return rc;
}

static void
tape_34xx_cleanup_device(struct tape_device *device)
{
	tape_std_unassign(device);
	
	if (device->discdata) {
		tape_34xx_delete_sbid_from(device, 0);
		kfree(device->discdata);
		device->discdata = NULL;
	}
}


/*
 * MTTELL: Tell block. Return the number of block relative to current file.
 */
static int
tape_34xx_mttell(struct tape_device *device, int mt_count)
{
	struct {
		struct tape_34xx_block_id	cbid;
		struct tape_34xx_block_id	dbid;
	} __attribute__ ((packed)) block_id;
	int rc;

	rc = tape_std_read_block_id(device, (__u64 *) &block_id);
	if (rc)
		return rc;

	tape_34xx_add_sbid(device, block_id.cbid);
	return block_id.cbid.block;
}

/*
 * MTSEEK: seek to the specified block.
 */
static int
tape_34xx_mtseek(struct tape_device *device, int mt_count)
{
	struct tape_request *request;
	struct tape_34xx_block_id *	bid;

	if (mt_count > 0x3fffff) {
		DBF_EXCEPTION(6, "xsee parm\n");
		return -EINVAL;
	}
	request = tape_alloc_request(3, 4);
	if (IS_ERR(request))
		return PTR_ERR(request);

	/* setup ccws */
	request->op = TO_LBL;
	bid         = (struct tape_34xx_block_id *) request->cpdata;
	bid->format = (*device->modeset_byte & 0x08) ?
			TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480;
	bid->block  = mt_count;
	tape_34xx_merge_sbid(device, bid);

	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
	tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
	tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);

	/* execute it */
	return tape_do_io_free(device, request);
}

/*
 * List of 3480/3490 magnetic tape commands.
 */
static tape_mtop_fn tape_34xx_mtop[TAPE_NR_MTOPS] = {
	[MTRESET]	 = tape_std_mtreset,
	[MTFSF]		 = tape_std_mtfsf,
	[MTBSF]		 = tape_std_mtbsf,
	[MTFSR]		 = tape_std_mtfsr,
	[MTBSR]		 = tape_std_mtbsr,
	[MTWEOF]	 = tape_std_mtweof,
	[MTREW]		 = tape_std_mtrew,
	[MTOFFL]	 = tape_std_mtoffl,
	[MTNOP]		 = tape_std_mtnop,
	[MTRETEN]	 = tape_std_mtreten,
	[MTBSFM]	 = tape_std_mtbsfm,
	[MTFSFM]	 = tape_std_mtfsfm,
	[MTEOM]		 = tape_std_mteom,
	[MTERASE]	 = tape_std_mterase,
	[MTRAS1]	 = NULL,
	[MTRAS2]	 = NULL,
	[MTRAS3]	 = NULL,
	[MTSETBLK]	 = tape_std_mtsetblk,
	[MTSETDENSITY]	 = NULL,
	[MTSEEK]	 = tape_34xx_mtseek,
	[MTTELL]	 = tape_34xx_mttell,
	[MTSETDRVBUFFER] = NULL,
	[MTFSS]		 = NULL,
	[MTBSS]		 = NULL,
	[MTWSM]		 = NULL,
	[MTLOCK]	 = NULL,
	[MTUNLOCK]	 = NULL,
	[MTLOAD]	 = tape_std_mtload,
	[MTUNLOAD]	 = tape_std_mtunload,
	[MTCOMPRESSION]	 = tape_std_mtcompression,
	[MTSETPART]	 = NULL,
	[MTMKPART]	 = NULL
};

/*
 * Tape discipline structure for 3480 and 3490.
 */
static struct tape_discipline tape_discipline_34xx = {
	.owner = THIS_MODULE,
	.setup_device = tape_34xx_setup_device,
	.cleanup_device = tape_34xx_cleanup_device,
	.process_eov = tape_std_process_eov,
	.irq = tape_34xx_irq,
	.read_block = tape_std_read_block,
	.write_block = tape_std_write_block,
	.ioctl_fn = tape_34xx_ioctl,
	.mtop_array = tape_34xx_mtop
};

static struct ccw_device_id tape_34xx_ids[] = {
	{ CCW_DEVICE_DEVTYPE(0x3480, 0, 0x3480, 0), .driver_info = tape_3480},
	{ CCW_DEVICE_DEVTYPE(0x3490, 0, 0x3490, 0), .driver_info = tape_3490},
	{ /* end of list */ },
};

static int
tape_34xx_online(struct ccw_device *cdev)
{
	return tape_generic_online(
		dev_get_drvdata(&cdev->dev),
		&tape_discipline_34xx
	);
}

static struct ccw_driver tape_34xx_driver = {
	.driver = {
		.name = "tape_34xx",
		.owner = THIS_MODULE,
	},
	.ids = tape_34xx_ids,
	.probe = tape_generic_probe,
	.remove = tape_generic_remove,
	.set_online = tape_34xx_online,
	.set_offline = tape_generic_offline,
	.freeze = tape_generic_pm_suspend,
	.int_class = IRQIO_TAP,
};

static int
tape_34xx_init (void)
{
	int rc;

	TAPE_DBF_AREA = debug_register ( "tape_34xx", 2, 2, 4*sizeof(long));
	debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
#ifdef DBF_LIKE_HELL
	debug_set_level(TAPE_DBF_AREA, 6);
#endif

	DBF_EVENT(3, "34xx init\n");
	/* Register driver for 3480/3490 tapes. */
	rc = ccw_driver_register(&tape_34xx_driver);
	if (rc)
		DBF_EVENT(3, "34xx init failed\n");
	else
		DBF_EVENT(3, "34xx registered\n");
	return rc;
}

static void
tape_34xx_exit(void)
{
	ccw_driver_unregister(&tape_34xx_driver);

	debug_unregister(TAPE_DBF_AREA);
}

MODULE_DEVICE_TABLE(ccw, tape_34xx_ids);
MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH");
MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape device driver");
MODULE_LICENSE("GPL");

module_init(tape_34xx_init);
module_exit(tape_34xx_exit);