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   1 /*
   2  *  drivers/s390/char/tape_34xx.c
   3  *    tape device discipline for 3480/3490 tapes.
   4  *
   5  *    Copyright (C) IBM Corp. 2001,2006
   6  *    Author(s): Carsten Otte <cotte@de.ibm.com>
   7  *               Tuan Ngo-Anh <ngoanh@de.ibm.com>
   8  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
   9  */
  10
  11 #define KMSG_COMPONENT "tape"
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/bio.h>
  16 #include <linux/workqueue.h>
  17
  18 #define TAPE_DBF_AREA   tape_34xx_dbf
  19
  20 #include "tape.h"
  21 #include "tape_std.h"
  22
  23 /*
  24  * Pointer to debug area.
  25  */
  26 debug_info_t *TAPE_DBF_AREA = NULL;
  27 EXPORT_SYMBOL(TAPE_DBF_AREA);
  28
  29 #define TAPE34XX_FMT_3480       0
  30 #define TAPE34XX_FMT_3480_2_XF  1
  31 #define TAPE34XX_FMT_3480_XF    2
  32
  33 struct tape_34xx_block_id {
  34         unsigned int    wrap            : 1;
  35         unsigned int    segment         : 7;
  36         unsigned int    format          : 2;
  37         unsigned int    block           : 22;
  38 };
  39
  40 /*
  41  * A list of block ID's is used to faster seek blocks.
  42  */
  43 struct tape_34xx_sbid {
  44         struct list_head                list;
  45         struct tape_34xx_block_id       bid;
  46 };
  47
  48 static void tape_34xx_delete_sbid_from(struct tape_device *, int);
  49
  50 /*
  51  * Medium sense for 34xx tapes. There is no 'real' medium sense call.
  52  * So we just do a normal sense.
  53  */
  54 static int
  55 tape_34xx_medium_sense(struct tape_device *device)
  56 {
  57         struct tape_request *request;
  58         unsigned char       *sense;
  59         int                  rc;
  60
  61         request = tape_alloc_request(1, 32);
  62         if (IS_ERR(request)) {
  63                 DBF_EXCEPTION(6, "MSEN fail\n");
  64                 return PTR_ERR(request);
  65         }
  66
  67         request->op = TO_MSEN;
  68         tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata);
  69
  70         rc = tape_do_io_interruptible(device, request);
  71         if (request->rc == 0) {
  72                 sense = request->cpdata;
  73
  74                 /*
  75                  * This isn't quite correct. But since INTERVENTION_REQUIRED
  76                  * means that the drive is 'neither ready nor on-line' it is
  77                  * only slightly inaccurate to say there is no tape loaded if
  78                  * the drive isn't online...
  79                  */
  80                 if (sense[0] & SENSE_INTERVENTION_REQUIRED)
  81                         tape_med_state_set(device, MS_UNLOADED);
  82                 else
  83                         tape_med_state_set(device, MS_LOADED);
  84
  85                 if (sense[1] & SENSE_WRITE_PROTECT)
  86                         device->tape_generic_status |= GMT_WR_PROT(~0);
  87                 else
  88                         device->tape_generic_status &= ~GMT_WR_PROT(~0);
  89         } else {
  90                 DBF_EVENT(4, "tape_34xx: medium sense failed with rc=%d\n",
  91                         request->rc);
  92         }
  93         tape_free_request(request);
  94
  95         return rc;
  96 }
  97
  98 struct tape_34xx_work {
  99         struct tape_device      *device;
 100         enum tape_op             op;
 101         struct work_struct       work;
 102 };
 103
 104 /*
 105  * These functions are currently used only to schedule a medium_sense for
 106  * later execution. This is because we get an interrupt whenever a medium
 107  * is inserted but cannot call tape_do_io* from an interrupt context.
 108  * Maybe that's useful for other actions we want to start from the
 109  * interrupt handler.
 110  */
 111 static void
 112 tape_34xx_work_handler(struct work_struct *work)
 113 {
 114         struct tape_34xx_work *p =
 115                 container_of(work, struct tape_34xx_work, work);
 116
 117         switch(p->op) {
 118                 case TO_MSEN:
 119                         tape_34xx_medium_sense(p->device);
 120                         break;
 121                 default:
 122                         DBF_EVENT(3, "T34XX: internal error: unknown work\n");
 123         }
 124
 125         p->device = tape_put_device(p->device);
 126         kfree(p);
 127 }
 128
 129 static int
 130 tape_34xx_schedule_work(struct tape_device *device, enum tape_op op)
 131 {
 132         struct tape_34xx_work *p;
 133
 134         if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
 135                 return -ENOMEM;
 136
 137         INIT_WORK(&p->work, tape_34xx_work_handler);
 138
 139         p->device = tape_get_device_reference(device);
 140         p->op     = op;
 141
 142         schedule_work(&p->work);
 143         return 0;
 144 }
 145
 146 /*
 147  * Done Handler is called when dev stat = DEVICE-END (successful operation)
 148  */
 149 static inline int
 150 tape_34xx_done(struct tape_request *request)
 151 {
 152         DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
 153
 154         switch (request->op) {
 155                 case TO_DSE:
 156                 case TO_RUN:
 157                 case TO_WRI:
 158                 case TO_WTM:
 159                 case TO_ASSIGN:
 160                 case TO_UNASSIGN:
 161                         tape_34xx_delete_sbid_from(request->device, 0);
 162                         break;
 163                 default:
 164                         ;
 165         }
 166         return TAPE_IO_SUCCESS;
 167 }
 168
 169 static inline int
 170 tape_34xx_erp_failed(struct tape_request *request, int rc)
 171 {
 172         DBF_EVENT(3, "Error recovery failed for %s (RC=%d)\n",
 173                   tape_op_verbose[request->op], rc);
 174         return rc;
 175 }
 176
 177 static inline int
 178 tape_34xx_erp_succeeded(struct tape_request *request)
 179 {
 180         DBF_EVENT(3, "Error Recovery successful for %s\n",
 181                   tape_op_verbose[request->op]);
 182         return tape_34xx_done(request);
 183 }
 184
 185 static inline int
 186 tape_34xx_erp_retry(struct tape_request *request)
 187 {
 188         DBF_EVENT(3, "xerp retr %s\n", tape_op_verbose[request->op]);
 189         return TAPE_IO_RETRY;
 190 }
 191
 192 /*
 193  * This function is called, when no request is outstanding and we get an
 194  * interrupt
 195  */
 196 static int
 197 tape_34xx_unsolicited_irq(struct tape_device *device, struct irb *irb)
 198 {
 199         if (irb->scsw.cmd.dstat == 0x85) { /* READY */
 200                 /* A medium was inserted in the drive. */
 201                 DBF_EVENT(6, "xuud med\n");
 202                 tape_34xx_delete_sbid_from(device, 0);
 203                 tape_34xx_schedule_work(device, TO_MSEN);
 204         } else {
 205                 DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id);
 206                 tape_dump_sense_dbf(device, NULL, irb);
 207         }
 208         return TAPE_IO_SUCCESS;
 209 }
 210
 211 /*
 212  * Read Opposite Error Recovery Function:
 213  * Used, when Read Forward does not work
 214  */
 215 static int
 216 tape_34xx_erp_read_opposite(struct tape_device *device,
 217                             struct tape_request *request)
 218 {
 219         if (request->op == TO_RFO) {
 220                 /*
 221                  * We did read forward, but the data could not be read
 222                  * *correctly*. We transform the request to a read backward
 223                  * and try again.
 224                  */
 225                 tape_std_read_backward(device, request);
 226                 return tape_34xx_erp_retry(request);
 227         }
 228
 229         /*
 230          * We tried to read forward and backward, but hat no
 231          * success -> failed.
 232          */
 233         return tape_34xx_erp_failed(request, -EIO);
 234 }
 235
 236 static int
 237 tape_34xx_erp_bug(struct tape_device *device, struct tape_request *request,
 238                   struct irb *irb, int no)
 239 {
 240         if (request->op != TO_ASSIGN) {
 241                 dev_err(&device->cdev->dev, "An unexpected condition %d "
 242                         "occurred in tape error recovery\n", no);
 243                 tape_dump_sense_dbf(device, request, irb);
 244         }
 245         return tape_34xx_erp_failed(request, -EIO);
 246 }
 247
 248 /*
 249  * Handle data overrun between cu and drive. The channel speed might
 250  * be too slow.
 251  */
 252 static int
 253 tape_34xx_erp_overrun(struct tape_device *device, struct tape_request *request,
 254                       struct irb *irb)
 255 {
 256         if (irb->ecw[3] == 0x40) {
 257                 dev_warn (&device->cdev->dev, "A data overrun occurred between"
 258                         " the control unit and tape unit\n");
 259                 return tape_34xx_erp_failed(request, -EIO);
 260         }
 261         return tape_34xx_erp_bug(device, request, irb, -1);
 262 }
 263
 264 /*
 265  * Handle record sequence error.
 266  */
 267 static int
 268 tape_34xx_erp_sequence(struct tape_device *device,
 269                        struct tape_request *request, struct irb *irb)
 270 {
 271         if (irb->ecw[3] == 0x41) {
 272                 /*
 273                  * cu detected incorrect block-id sequence on tape.
 274                  */
 275                 dev_warn (&device->cdev->dev, "The block ID sequence on the "
 276                         "tape is incorrect\n");
 277                 return tape_34xx_erp_failed(request, -EIO);
 278         }
 279         /*
 280          * Record sequence error bit is set, but erpa does not
 281          * show record sequence error.
 282          */
 283         return tape_34xx_erp_bug(device, request, irb, -2);
 284 }
 285
 286 /*
 287  * This function analyses the tape's sense-data in case of a unit-check.
 288  * If possible, it tries to recover from the error. Else the user is
 289  * informed about the problem.
 290  */
 291 static int
 292 tape_34xx_unit_check(struct tape_device *device, struct tape_request *request,
 293                      struct irb *irb)
 294 {
 295         int inhibit_cu_recovery;
 296         __u8* sense;
 297
 298         inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0;
 299         sense = irb->ecw;
 300
 301 #ifdef CONFIG_S390_TAPE_BLOCK
 302         if (request->op == TO_BLOCK) {
 303                 /*
 304                  * Recovery for block device requests. Set the block_position
 305                  * to something invalid and retry.
 306                  */
 307                 device->blk_data.block_position = -1;
 308                 if (request->retries-- <= 0)
 309                         return tape_34xx_erp_failed(request, -EIO);
 310                 else
 311                         return tape_34xx_erp_retry(request);
 312         }
 313 #endif
 314
 315         if (
 316                 sense[0] & SENSE_COMMAND_REJECT &&
 317                 sense[1] & SENSE_WRITE_PROTECT
 318         ) {
 319                 if (
 320                         request->op == TO_DSE ||
 321                         request->op == TO_WRI ||
 322                         request->op == TO_WTM
 323                 ) {
 324                         /* medium is write protected */
 325                         return tape_34xx_erp_failed(request, -EACCES);
 326                 } else {
 327                         return tape_34xx_erp_bug(device, request, irb, -3);
 328                 }
 329         }
 330
 331         /*
 332          * Special cases for various tape-states when reaching
 333          * end of recorded area
 334          *
 335          * FIXME: Maybe a special case of the special case:
 336          *        sense[0] == SENSE_EQUIPMENT_CHECK &&
 337          *        sense[1] == SENSE_DRIVE_ONLINE    &&
 338          *        sense[3] == 0x47 (Volume Fenced)
 339          *
 340          *        This was caused by continued FSF or FSR after an
 341          *        'End Of Data'.
 342          */
 343         if ((
 344                 sense[0] == SENSE_DATA_CHECK      ||
 345                 sense[0] == SENSE_EQUIPMENT_CHECK ||
 346                 sense[0] == SENSE_EQUIPMENT_CHECK + SENSE_DEFERRED_UNIT_CHECK
 347         ) && (
 348                 sense[1] == SENSE_DRIVE_ONLINE ||
 349                 sense[1] == SENSE_BEGINNING_OF_TAPE + SENSE_WRITE_MODE
 350         )) {
 351                 switch (request->op) {
 352                 /*
 353                  * sense[0] == SENSE_DATA_CHECK   &&
 354                  * sense[1] == SENSE_DRIVE_ONLINE
 355                  * sense[3] == 0x36 (End Of Data)
 356                  *
 357                  * Further seeks might return a 'Volume Fenced'.
 358                  */
 359                 case TO_FSF:
 360                 case TO_FSB:
 361                         /* Trying to seek beyond end of recorded area */
 362                         return tape_34xx_erp_failed(request, -ENOSPC);
 363                 case TO_BSB:
 364                         return tape_34xx_erp_retry(request);
 365
 366                 /*
 367                  * sense[0] == SENSE_DATA_CHECK   &&
 368                  * sense[1] == SENSE_DRIVE_ONLINE &&
 369                  * sense[3] == 0x36 (End Of Data)
 370                  */
 371                 case TO_LBL:
 372                         /* Block could not be located. */
 373                         tape_34xx_delete_sbid_from(device, 0);
 374                         return tape_34xx_erp_failed(request, -EIO);
 375
 376                 case TO_RFO:
 377                         /* Read beyond end of recorded area -> 0 bytes read */
 378                         return tape_34xx_erp_failed(request, 0);
 379
 380                 /*
 381                  * sense[0] == SENSE_EQUIPMENT_CHECK &&
 382                  * sense[1] == SENSE_DRIVE_ONLINE    &&
 383                  * sense[3] == 0x38 (Physical End Of Volume)
 384                  */
 385                 case TO_WRI:
 386                         /* Writing at physical end of volume */
 387                         return tape_34xx_erp_failed(request, -ENOSPC);
 388                 default:
 389                         return tape_34xx_erp_failed(request, 0);
 390                 }
 391         }
 392
 393         /* Sensing special bits */
 394         if (sense[0] & SENSE_BUS_OUT_CHECK)
 395                 return tape_34xx_erp_retry(request);
 396
 397         if (sense[0] & SENSE_DATA_CHECK) {
 398                 /*
 399                  * hardware failure, damaged tape or improper
 400                  * operating conditions
 401                  */
 402                 switch (sense[3]) {
 403                 case 0x23:
 404                         /* a read data check occurred */
 405                         if ((sense[2] & SENSE_TAPE_SYNC_MODE) ||
 406                             inhibit_cu_recovery)
 407                                 // data check is not permanent, may be
 408                                 // recovered. We always use async-mode with
 409                                 // cu-recovery, so this should *never* happen.
 410                                 return tape_34xx_erp_bug(device, request,
 411                                                          irb, -4);
 412
 413                         /* data check is permanent, CU recovery has failed */
 414                         dev_warn (&device->cdev->dev, "A read error occurred "
 415                                 "that cannot be recovered\n");
 416                         return tape_34xx_erp_failed(request, -EIO);
 417                 case 0x25:
 418                         // a write data check occurred
 419                         if ((sense[2] & SENSE_TAPE_SYNC_MODE) ||
 420                             inhibit_cu_recovery)
 421                                 // data check is not permanent, may be
 422                                 // recovered. We always use async-mode with
 423                                 // cu-recovery, so this should *never* happen.
 424                                 return tape_34xx_erp_bug(device, request,
 425                                                          irb, -5);
 426
 427                         // data check is permanent, cu-recovery has failed
 428                         dev_warn (&device->cdev->dev, "A write error on the "
 429                                 "tape cannot be recovered\n");
 430                         return tape_34xx_erp_failed(request, -EIO);
 431                 case 0x26:
 432                         /* Data Check (read opposite) occurred. */
 433                         return tape_34xx_erp_read_opposite(device, request);
 434                 case 0x28:
 435                         /* ID-Mark at tape start couldn't be written */
 436                         dev_warn (&device->cdev->dev, "Writing the ID-mark "
 437                                 "failed\n");
 438                         return tape_34xx_erp_failed(request, -EIO);
 439                 case 0x31:
 440                         /* Tape void. Tried to read beyond end of device. */
 441                         dev_warn (&device->cdev->dev, "Reading the tape beyond"
 442                                 " the end of the recorded area failed\n");
 443                         return tape_34xx_erp_failed(request, -ENOSPC);
 444                 case 0x41:
 445                         /* Record sequence error. */
 446                         dev_warn (&device->cdev->dev, "The tape contains an "
 447                                 "incorrect block ID sequence\n");
 448                         return tape_34xx_erp_failed(request, -EIO);
 449                 default:
 450                         /* all data checks for 3480 should result in one of
 451                          * the above erpa-codes. For 3490, other data-check
 452                          * conditions do exist. */
 453                         if (device->cdev->id.driver_info == tape_3480)
 454                                 return tape_34xx_erp_bug(device, request,
 455                                                          irb, -6);
 456                 }
 457         }
 458
 459         if (sense[0] & SENSE_OVERRUN)
 460                 return tape_34xx_erp_overrun(device, request, irb);
 461
 462         if (sense[1] & SENSE_RECORD_SEQUENCE_ERR)
 463                 return tape_34xx_erp_sequence(device, request, irb);
 464
 465         /* Sensing erpa codes */
 466         switch (sense[3]) {
 467         case 0x00:
 468                 /* Unit check with erpa code 0. Report and ignore. */
 469                 return TAPE_IO_SUCCESS;
 470         case 0x21:
 471                 /*
 472                  * Data streaming not operational. CU will switch to
 473                  * interlock mode. Reissue the command.
 474                  */
 475                 return tape_34xx_erp_retry(request);
 476         case 0x22:
 477                 /*
 478                  * Path equipment check. Might be drive adapter error, buffer
 479                  * error on the lower interface, internal path not usable,
 480                  * or error during cartridge load.
 481                  */
 482                 dev_warn (&device->cdev->dev, "A path equipment check occurred"
 483                         " for the tape device\n");
 484                 return tape_34xx_erp_failed(request, -EIO);
 485         case 0x24:
 486                 /*
 487                  * Load display check. Load display was command was issued,
 488                  * but the drive is displaying a drive check message. Can
 489                  * be threated as "device end".
 490                  */
 491                 return tape_34xx_erp_succeeded(request);
 492         case 0x27:
 493                 /*
 494                  * Command reject. May indicate illegal channel program or
 495                  * buffer over/underrun. Since all channel programs are
 496                  * issued by this driver and ought be correct, we assume a
 497                  * over/underrun situation and retry the channel program.
 498                  */
 499                 return tape_34xx_erp_retry(request);
 500         case 0x29:
 501                 /*
 502                  * Function incompatible. Either the tape is idrc compressed
 503                  * but the hardware isn't capable to do idrc, or a perform
 504                  * subsystem func is issued and the CU is not on-line.
 505                  */
 506                 return tape_34xx_erp_failed(request, -EIO);
 507         case 0x2a:
 508                 /*
 509                  * Unsolicited environmental data. An internal counter
 510                  * overflows, we can ignore this and reissue the cmd.
 511                  */
 512                 return tape_34xx_erp_retry(request);
 513         case 0x2b:
 514                 /*
 515                  * Environmental data present. Indicates either unload
 516                  * completed ok or read buffered log command completed ok.
 517                  */
 518                 if (request->op == TO_RUN) {
 519                         /* Rewind unload completed ok. */
 520                         tape_med_state_set(device, MS_UNLOADED);
 521                         return tape_34xx_erp_succeeded(request);
 522                 }
 523                 /* tape_34xx doesn't use read buffered log commands. */
 524                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 525         case 0x2c:
 526                 /*
 527                  * Permanent equipment check. CU has tried recovery, but
 528                  * did not succeed.
 529                  */
 530                 return tape_34xx_erp_failed(request, -EIO);
 531         case 0x2d:
 532                 /* Data security erase failure. */
 533                 if (request->op == TO_DSE)
 534                         return tape_34xx_erp_failed(request, -EIO);
 535                 /* Data security erase failure, but no such command issued. */
 536                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 537         case 0x2e:
 538                 /*
 539                  * Not capable. This indicates either that the drive fails
 540                  * reading the format id mark or that that format specified
 541                  * is not supported by the drive.
 542                  */
 543                 dev_warn (&device->cdev->dev, "The tape unit cannot process "
 544                         "the tape format\n");
 545                 return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
 546         case 0x30:
 547                 /* The medium is write protected. */
 548                 dev_warn (&device->cdev->dev, "The tape medium is write-"
 549                         "protected\n");
 550                 return tape_34xx_erp_failed(request, -EACCES);
 551         case 0x32:
 552                 // Tension loss. We cannot recover this, it's an I/O error.
 553                 dev_warn (&device->cdev->dev, "The tape does not have the "
 554                         "required tape tension\n");
 555                 return tape_34xx_erp_failed(request, -EIO);
 556         case 0x33:
 557                 /*
 558                  * Load Failure. The cartridge was not inserted correctly or
 559                  * the tape is not threaded correctly.
 560                  */
 561                 dev_warn (&device->cdev->dev, "The tape unit failed to load"
 562                         " the cartridge\n");
 563                 tape_34xx_delete_sbid_from(device, 0);
 564                 return tape_34xx_erp_failed(request, -EIO);
 565         case 0x34:
 566                 /*
 567                  * Unload failure. The drive cannot maintain tape tension
 568                  * and control tape movement during an unload operation.
 569                  */
 570                 dev_warn (&device->cdev->dev, "Automatic unloading of the tape"
 571                         " cartridge failed\n");
 572                 if (request->op == TO_RUN)
 573                         return tape_34xx_erp_failed(request, -EIO);
 574                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 575         case 0x35:
 576                 /*
 577                  * Drive equipment check. One of the following:
 578                  * - cu cannot recover from a drive detected error
 579                  * - a check code message is shown on drive display
 580                  * - the cartridge loader does not respond correctly
 581                  * - a failure occurs during an index, load, or unload cycle
 582                  */
 583                 dev_warn (&device->cdev->dev, "An equipment check has occurred"
 584                         " on the tape unit\n");
 585                 return tape_34xx_erp_failed(request, -EIO);
 586         case 0x36:
 587                 if (device->cdev->id.driver_info == tape_3490)
 588                         /* End of data. */
 589                         return tape_34xx_erp_failed(request, -EIO);
 590                 /* This erpa is reserved for 3480 */
 591                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 592         case 0x37:
 593                 /*
 594                  * Tape length error. The tape is shorter than reported in
 595                  * the beginning-of-tape data.
 596                  */
 597                 dev_warn (&device->cdev->dev, "The tape information states an"
 598                         " incorrect length\n");
 599                 return tape_34xx_erp_failed(request, -EIO);
 600         case 0x38:
 601                 /*
 602                  * Physical end of tape. A read/write operation reached
 603                  * the physical end of tape.
 604                  */
 605                 if (request->op==TO_WRI ||
 606                     request->op==TO_DSE ||
 607                     request->op==TO_WTM)
 608                         return tape_34xx_erp_failed(request, -ENOSPC);
 609                 return tape_34xx_erp_failed(request, -EIO);
 610         case 0x39:
 611                 /* Backward at Beginning of tape. */
 612                 return tape_34xx_erp_failed(request, -EIO);
 613         case 0x3a:
 614                 /* Drive switched to not ready. */
 615                 dev_warn (&device->cdev->dev, "The tape unit is not ready\n");
 616                 return tape_34xx_erp_failed(request, -EIO);
 617         case 0x3b:
 618                 /* Manual rewind or unload. This causes an I/O error. */
 619                 dev_warn (&device->cdev->dev, "The tape medium has been "
 620                         "rewound or unloaded manually\n");
 621                 tape_34xx_delete_sbid_from(device, 0);
 622                 return tape_34xx_erp_failed(request, -EIO);
 623         case 0x42:
 624                 /*
 625                  * Degraded mode. A condition that can cause degraded
 626                  * performance is detected.
 627                  */
 628                 dev_warn (&device->cdev->dev, "The tape subsystem is running "
 629                         "in degraded mode\n");
 630                 return tape_34xx_erp_retry(request);
 631         case 0x43:
 632                 /* Drive not ready. */
 633                 tape_34xx_delete_sbid_from(device, 0);
 634                 tape_med_state_set(device, MS_UNLOADED);
 635                 /* Some commands commands are successful even in this case */
 636                 if (sense[1] & SENSE_DRIVE_ONLINE) {
 637                         switch(request->op) {
 638                                 case TO_ASSIGN:
 639                                 case TO_UNASSIGN:
 640                                 case TO_DIS:
 641                                 case TO_NOP:
 642                                         return tape_34xx_done(request);
 643                                         break;
 644                                 default:
 645                                         break;
 646                         }
 647                 }
 648                 return tape_34xx_erp_failed(request, -ENOMEDIUM);
 649         case 0x44:
 650                 /* Locate Block unsuccessful. */
 651                 if (request->op != TO_BLOCK && request->op != TO_LBL)
 652                         /* No locate block was issued. */
 653                         return tape_34xx_erp_bug(device, request,
 654                                                  irb, sense[3]);
 655                 return tape_34xx_erp_failed(request, -EIO);
 656         case 0x45:
 657                 /* The drive is assigned to a different channel path. */
 658                 dev_warn (&device->cdev->dev, "The tape unit is already "
 659                         "assigned\n");
 660                 return tape_34xx_erp_failed(request, -EIO);
 661         case 0x46:
 662                 /*
 663                  * Drive not on-line. Drive may be switched offline,
 664                  * the power supply may be switched off or
 665                  * the drive address may not be set correctly.
 666                  */
 667                 dev_warn (&device->cdev->dev, "The tape unit is not online\n");
 668                 return tape_34xx_erp_failed(request, -EIO);
 669         case 0x47:
 670                 /* Volume fenced. CU reports volume integrity is lost. */
 671                 dev_warn (&device->cdev->dev, "The control unit has fenced "
 672                         "access to the tape volume\n");
 673                 tape_34xx_delete_sbid_from(device, 0);
 674                 return tape_34xx_erp_failed(request, -EIO);
 675         case 0x48:
 676                 /* Log sense data and retry request. */
 677                 return tape_34xx_erp_retry(request);
 678         case 0x49:
 679                 /* Bus out check. A parity check error on the bus was found. */
 680                 dev_warn (&device->cdev->dev, "A parity error occurred on the "
 681                         "tape bus\n");
 682                 return tape_34xx_erp_failed(request, -EIO);
 683         case 0x4a:
 684                 /* Control unit erp failed. */
 685                 dev_warn (&device->cdev->dev, "I/O error recovery failed on "
 686                         "the tape control unit\n");
 687                 return tape_34xx_erp_failed(request, -EIO);
 688         case 0x4b:
 689                 /*
 690                  * CU and drive incompatible. The drive requests micro-program
 691                  * patches, which are not available on the CU.
 692                  */
 693                 dev_warn (&device->cdev->dev, "The tape unit requires a "
 694                         "firmware update\n");
 695                 return tape_34xx_erp_failed(request, -EIO);
 696         case 0x4c:
 697                 /*
 698                  * Recovered Check-One failure. Cu develops a hardware error,
 699                  * but is able to recover.
 700                  */
 701                 return tape_34xx_erp_retry(request);
 702         case 0x4d:
 703                 if (device->cdev->id.driver_info == tape_3490)
 704                         /*
 705                          * Resetting event received. Since the driver does
 706                          * not support resetting event recovery (which has to
 707                          * be handled by the I/O Layer), retry our command.
 708                          */
 709                         return tape_34xx_erp_retry(request);
 710                 /* This erpa is reserved for 3480. */
 711                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 712         case 0x4e:
 713                 if (device->cdev->id.driver_info == tape_3490) {
 714                         /*
 715                          * Maximum block size exceeded. This indicates, that
 716                          * the block to be written is larger than allowed for
 717                          * buffered mode.
 718                          */
 719                         dev_warn (&device->cdev->dev, "The maximum block size"
 720                                 " for buffered mode is exceeded\n");
 721                         return tape_34xx_erp_failed(request, -ENOBUFS);
 722                 }
 723                 /* This erpa is reserved for 3480. */
 724                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 725         case 0x50:
 726                 /*
 727                  * Read buffered log (Overflow). CU is running in extended
 728                  * buffered log mode, and a counter overflows. This should
 729                  * never happen, since we're never running in extended
 730                  * buffered log mode.
 731                  */
 732                 return tape_34xx_erp_retry(request);
 733         case 0x51:
 734                 /*
 735                  * Read buffered log (EOV). EOF processing occurs while the
 736                  * CU is in extended buffered log mode. This should never
 737                  * happen, since we're never running in extended buffered
 738                  * log mode.
 739                  */
 740                 return tape_34xx_erp_retry(request);
 741         case 0x52:
 742                 /* End of Volume complete. Rewind unload completed ok. */
 743                 if (request->op == TO_RUN) {
 744                         tape_med_state_set(device, MS_UNLOADED);
 745                         tape_34xx_delete_sbid_from(device, 0);
 746                         return tape_34xx_erp_succeeded(request);
 747                 }
 748                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 749         case 0x53:
 750                 /* Global command intercept. */
 751                 return tape_34xx_erp_retry(request);
 752         case 0x54:
 753                 /* Channel interface recovery (temporary). */
 754                 return tape_34xx_erp_retry(request);
 755         case 0x55:
 756                 /* Channel interface recovery (permanent). */
 757                 dev_warn (&device->cdev->dev, "A channel interface error cannot be"
 758                         " recovered\n");
 759                 return tape_34xx_erp_failed(request, -EIO);
 760         case 0x56:
 761                 /* Channel protocol error. */
 762                 dev_warn (&device->cdev->dev, "A channel protocol error "
 763                         "occurred\n");
 764                 return tape_34xx_erp_failed(request, -EIO);
 765         case 0x57:
 766                 if (device->cdev->id.driver_info == tape_3480) {
 767                         /* Attention intercept. */
 768                         return tape_34xx_erp_retry(request);
 769                 } else {
 770                         /* Global status intercept. */
 771                         return tape_34xx_erp_retry(request);
 772                 }
 773         case 0x5a:
 774                 /*
 775                  * Tape length incompatible. The tape inserted is too long,
 776                  * which could cause damage to the tape or the drive.
 777                  */
 778                 dev_warn (&device->cdev->dev, "The tape unit does not support "
 779                         "the tape length\n");
 780                 return tape_34xx_erp_failed(request, -EIO);
 781         case 0x5b:
 782                 /* Format 3480 XF incompatible */
 783                 if (sense[1] & SENSE_BEGINNING_OF_TAPE)
 784                         /* The tape will get overwritten. */
 785                         return tape_34xx_erp_retry(request);
 786                 dev_warn (&device->cdev->dev, "The tape unit does not support"
 787                         " format 3480 XF\n");
 788                 return tape_34xx_erp_failed(request, -EIO);
 789         case 0x5c:
 790                 /* Format 3480-2 XF incompatible */
 791                 dev_warn (&device->cdev->dev, "The tape unit does not support tape "
 792                         "format 3480-2 XF\n");
 793                 return tape_34xx_erp_failed(request, -EIO);
 794         case 0x5d:
 795                 /* Tape length violation. */
 796                 dev_warn (&device->cdev->dev, "The tape unit does not support"
 797                         " the current tape length\n");
 798                 return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
 799         case 0x5e:
 800                 /* Compaction algorithm incompatible. */
 801                 dev_warn (&device->cdev->dev, "The tape unit does not support"
 802                         " the compaction algorithm\n");
 803                 return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
 804
 805                 /* The following erpas should have been covered earlier. */
 806         case 0x23: /* Read data check. */
 807         case 0x25: /* Write data check. */
 808         case 0x26: /* Data check (read opposite). */
 809         case 0x28: /* Write id mark check. */
 810         case 0x31: /* Tape void. */
 811         case 0x40: /* Overrun error. */
 812         case 0x41: /* Record sequence error. */
 813                 /* All other erpas are reserved for future use. */
 814         default:
 815                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 816         }
 817 }
 818
 819 /*
 820  * 3480/3490 interrupt handler
 821  */
 822 static int
 823 tape_34xx_irq(struct tape_device *device, struct tape_request *request,
 824               struct irb *irb)
 825 {
 826         if (request == NULL)
 827                 return tape_34xx_unsolicited_irq(device, irb);
 828
 829         if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) &&
 830             (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) &&
 831             (request->op == TO_WRI)) {
 832                 /* Write at end of volume */
 833                 return tape_34xx_erp_failed(request, -ENOSPC);
 834         }
 835
 836         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 837                 return tape_34xx_unit_check(device, request, irb);
 838
 839         if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
 840                 /*
 841                  * A unit exception occurs on skipping over a tapemark block.
 842                  */
 843                 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
 844                         if (request->op == TO_BSB || request->op == TO_FSB)
 845                                 request->rescnt++;
 846                         else
 847                                 DBF_EVENT(5, "Unit Exception!\n");
 848                 }
 849                 return tape_34xx_done(request);
 850         }
 851
 852         DBF_EVENT(6, "xunknownirq\n");
 853         tape_dump_sense_dbf(device, request, irb);
 854         return TAPE_IO_STOP;
 855 }
 856
 857 /*
 858  * ioctl_overload
 859  */
 860 static int
 861 tape_34xx_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
 862 {
 863         if (cmd == TAPE390_DISPLAY) {
 864                 struct display_struct disp;
 865
 866                 if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)) != 0)
 867                         return -EFAULT;
 868
 869                 return tape_std_display(device, &disp);
 870         } else
 871                 return -EINVAL;
 872 }
 873
 874 static inline void
 875 tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l)
 876 {
 877         struct tape_34xx_sbid * new_sbid;
 878
 879         new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC);
 880         if (!new_sbid)
 881                 return;
 882
 883         new_sbid->bid = bid;
 884         list_add(&new_sbid->list, l);
 885 }
 886
 887 /*
 888  * Build up the search block ID list. The block ID consists of a logical
 889  * block number and a hardware specific part. The hardware specific part
 890  * helps the tape drive to speed up searching for a specific block.
 891  */
 892 static void
 893 tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid)
 894 {
 895         struct list_head *      sbid_list;
 896         struct tape_34xx_sbid * sbid;
 897         struct list_head *      l;
 898
 899         /*
 900          * immediately return if there is no list at all or the block to add
 901          * is located in segment 1 of wrap 0 because this position is used
 902          * if no hardware position data is supplied.
 903          */
 904         sbid_list = (struct list_head *) device->discdata;
 905         if (!sbid_list || (bid.segment < 2 && bid.wrap == 0))
 906                 return;
 907
 908         /*
 909          * Search the position where to insert the new entry. Hardware
 910          * acceleration uses only the segment and wrap number. So we
 911          * need only one entry for a specific wrap/segment combination.
 912          * If there is a block with a lower number but the same hard-
 913          * ware position data we just update the block number in the
 914          * existing entry.
 915          */
 916         list_for_each(l, sbid_list) {
 917                 sbid = list_entry(l, struct tape_34xx_sbid, list);
 918
 919                 if (
 920                         (sbid->bid.segment == bid.segment) &&
 921                         (sbid->bid.wrap    == bid.wrap)
 922                 ) {
 923                         if (bid.block < sbid->bid.block)
 924                                 sbid->bid = bid;
 925                         else return;
 926                         break;
 927                 }
 928
 929                 /* Sort in according to logical block number. */
 930                 if (bid.block < sbid->bid.block) {
 931                         tape_34xx_append_new_sbid(bid, l->prev);
 932                         break;
 933                 }
 934         }
 935         /* List empty or new block bigger than last entry. */
 936         if (l == sbid_list)
 937                 tape_34xx_append_new_sbid(bid, l->prev);
 938
 939         DBF_LH(4, "Current list is:\n");
 940         list_for_each(l, sbid_list) {
 941                 sbid = list_entry(l, struct tape_34xx_sbid, list);
 942                 DBF_LH(4, "%d:%03d@%05d\n",
 943                         sbid->bid.wrap,
 944                         sbid->bid.segment,
 945                         sbid->bid.block
 946                 );
 947         }
 948 }
 949
 950 /*
 951  * Delete all entries from the search block ID list that belong to tape blocks
 952  * equal or higher than the given number.
 953  */
 954 static void
 955 tape_34xx_delete_sbid_from(struct tape_device *device, int from)
 956 {
 957         struct list_head *      sbid_list;
 958         struct tape_34xx_sbid * sbid;
 959         struct list_head *      l;
 960         struct list_head *      n;
 961
 962         sbid_list = (struct list_head *) device->discdata;
 963         if (!sbid_list)
 964                 return;
 965
 966         list_for_each_safe(l, n, sbid_list) {
 967                 sbid = list_entry(l, struct tape_34xx_sbid, list);
 968                 if (sbid->bid.block >= from) {
 969                         DBF_LH(4, "Delete sbid %d:%03d@%05d\n",
 970                                 sbid->bid.wrap,
 971                                 sbid->bid.segment,
 972                                 sbid->bid.block
 973                         );
 974                         list_del(l);
 975                         kfree(sbid);
 976                 }
 977         }
 978 }
 979
 980 /*
 981  * Merge hardware position data into a block id.
 982  */
 983 static void
 984 tape_34xx_merge_sbid(
 985         struct tape_device *            device,
 986         struct tape_34xx_block_id *     bid
 987 ) {
 988         struct tape_34xx_sbid * sbid;
 989         struct tape_34xx_sbid * sbid_to_use;
 990         struct list_head *      sbid_list;
 991         struct list_head *      l;
 992
 993         sbid_list = (struct list_head *) device->discdata;
 994         bid->wrap    = 0;
 995         bid->segment = 1;
 996
 997         if (!sbid_list || list_empty(sbid_list))
 998                 return;
 999
1000         sbid_to_use = NULL;
1001         list_for_each(l, sbid_list) {
1002                 sbid = list_entry(l, struct tape_34xx_sbid, list);
1003
1004                 if (sbid->bid.block >= bid->block)
1005                         break;
1006                 sbid_to_use = sbid;
1007         }
1008         if (sbid_to_use) {
1009                 bid->wrap    = sbid_to_use->bid.wrap;
1010                 bid->segment = sbid_to_use->bid.segment;
1011                 DBF_LH(4, "Use %d:%03d@%05d for %05d\n",
1012                         sbid_to_use->bid.wrap,
1013                         sbid_to_use->bid.segment,
1014                         sbid_to_use->bid.block,
1015                         bid->block
1016                 );
1017         }
1018 }
1019
1020 static int
1021 tape_34xx_setup_device(struct tape_device * device)
1022 {
1023         int                     rc;
1024         struct list_head *      discdata;
1025
1026         DBF_EVENT(6, "34xx device setup\n");
1027         if ((rc = tape_std_assign(device)) == 0) {
1028                 if ((rc = tape_34xx_medium_sense(device)) != 0) {
1029                         DBF_LH(3, "34xx medium sense returned %d\n", rc);
1030                 }
1031         }
1032         discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL);
1033         if (discdata) {
1034                         INIT_LIST_HEAD(discdata);
1035                         device->discdata = discdata;
1036         }
1037
1038         return rc;
1039 }
1040
1041 static void
1042 tape_34xx_cleanup_device(struct tape_device *device)
1043 {
1044         tape_std_unassign(device);
1045
1046         if (device->discdata) {
1047                 tape_34xx_delete_sbid_from(device, 0);
1048                 kfree(device->discdata);
1049                 device->discdata = NULL;
1050         }
1051 }
1052
1053
1054 /*
1055  * MTTELL: Tell block. Return the number of block relative to current file.
1056  */
1057 static int
1058 tape_34xx_mttell(struct tape_device *device, int mt_count)
1059 {
1060         struct {
1061                 struct tape_34xx_block_id       cbid;
1062                 struct tape_34xx_block_id       dbid;
1063         } __attribute__ ((packed)) block_id;
1064         int rc;
1065
1066         rc = tape_std_read_block_id(device, (__u64 *) &block_id);
1067         if (rc)
1068                 return rc;
1069
1070         tape_34xx_add_sbid(device, block_id.cbid);
1071         return block_id.cbid.block;
1072 }
1073
1074 /*
1075  * MTSEEK: seek to the specified block.
1076  */
1077 static int
1078 tape_34xx_mtseek(struct tape_device *device, int mt_count)
1079 {
1080         struct tape_request *request;
1081         struct tape_34xx_block_id *     bid;
1082
1083         if (mt_count > 0x3fffff) {
1084                 DBF_EXCEPTION(6, "xsee parm\n");
1085                 return -EINVAL;
1086         }
1087         request = tape_alloc_request(3, 4);
1088         if (IS_ERR(request))
1089                 return PTR_ERR(request);
1090
1091         /* setup ccws */
1092         request->op = TO_LBL;
1093         bid         = (struct tape_34xx_block_id *) request->cpdata;
1094         bid->format = (*device->modeset_byte & 0x08) ?
1095                         TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480;
1096         bid->block  = mt_count;
1097         tape_34xx_merge_sbid(device, bid);
1098
1099         tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
1100         tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
1101         tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
1102
1103         /* execute it */
1104         return tape_do_io_free(device, request);
1105 }
1106
1107 #ifdef CONFIG_S390_TAPE_BLOCK
1108 /*
1109  * Tape block read for 34xx.
1110  */
1111 static struct tape_request *
1112 tape_34xx_bread(struct tape_device *device, struct request *req)
1113 {
1114         struct tape_request *request;
1115         struct ccw1 *ccw;
1116         int count = 0;
1117         unsigned off;
1118         char *dst;
1119         struct bio_vec *bv;
1120         struct req_iterator iter;
1121         struct tape_34xx_block_id *     start_block;
1122
1123         DBF_EVENT(6, "xBREDid:");
1124
1125         /* Count the number of blocks for the request. */
1126         rq_for_each_segment(bv, req, iter)
1127                 count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9);
1128
1129         /* Allocate the ccw request. */
1130         request = tape_alloc_request(3+count+1, 8);
1131         if (IS_ERR(request))
1132                 return request;
1133
1134         /* Setup ccws. */
1135         request->op = TO_BLOCK;
1136         start_block = (struct tape_34xx_block_id *) request->cpdata;
1137         start_block->block = req->sector >> TAPEBLOCK_HSEC_S2B;
1138         DBF_EVENT(6, "start_block = %i\n", start_block->block);
1139
1140         ccw = request->cpaddr;
1141         ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte);
1142
1143         /*
1144          * We always setup a nop after the mode set ccw. This slot is
1145          * used in tape_std_check_locate to insert a locate ccw if the
1146          * current tape position doesn't match the start block to be read.
1147          * The second nop will be filled with a read block id which is in
1148          * turn used by tape_34xx_free_bread to populate the segment bid
1149          * table.
1150          */
1151         ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
1152         ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
1153
1154         rq_for_each_segment(bv, req, iter) {
1155                 dst = kmap(bv->bv_page) + bv->bv_offset;
1156                 for (off = 0; off < bv->bv_len; off += TAPEBLOCK_HSEC_SIZE) {
1157                         ccw->flags = CCW_FLAG_CC;
1158                         ccw->cmd_code = READ_FORWARD;
1159                         ccw->count = TAPEBLOCK_HSEC_SIZE;
1160                         set_normalized_cda(ccw, (void*) __pa(dst));
1161                         ccw++;
1162                         dst += TAPEBLOCK_HSEC_SIZE;
1163                 }
1164         }
1165
1166         ccw = tape_ccw_end(ccw, NOP, 0, NULL);
1167         DBF_EVENT(6, "xBREDccwg\n");
1168         return request;
1169 }
1170
1171 static void
1172 tape_34xx_free_bread (struct tape_request *request)
1173 {
1174         struct ccw1* ccw;
1175
1176         ccw = request->cpaddr;
1177         if ((ccw + 2)->cmd_code == READ_BLOCK_ID) {
1178                 struct {
1179                         struct tape_34xx_block_id       cbid;
1180                         struct tape_34xx_block_id       dbid;
1181                 } __attribute__ ((packed)) *rbi_data;
1182
1183                 rbi_data = request->cpdata;
1184
1185                 if (request->device)
1186                         tape_34xx_add_sbid(request->device, rbi_data->cbid);
1187         }
1188
1189         /* Last ccw is a nop and doesn't need clear_normalized_cda */
1190         for (; ccw->flags & CCW_FLAG_CC; ccw++)
1191                 if (ccw->cmd_code == READ_FORWARD)
1192                         clear_normalized_cda(ccw);
1193         tape_free_request(request);
1194 }
1195
1196 /*
1197  * check_locate is called just before the tape request is passed to
1198  * the common io layer for execution. It has to check the current
1199  * tape position and insert a locate ccw if it doesn't match the
1200  * start block for the request.
1201  */
1202 static void
1203 tape_34xx_check_locate(struct tape_device *device, struct tape_request *request)
1204 {
1205         struct tape_34xx_block_id *     start_block;
1206
1207         start_block = (struct tape_34xx_block_id *) request->cpdata;
1208         if (start_block->block == device->blk_data.block_position)
1209                 return;
1210
1211         DBF_LH(4, "Block seek(%06d+%06d)\n", start_block->block, device->bof);
1212         start_block->wrap    = 0;
1213         start_block->segment = 1;
1214         start_block->format  = (*device->modeset_byte & 0x08) ?
1215                                 TAPE34XX_FMT_3480_XF :
1216                                 TAPE34XX_FMT_3480;
1217         start_block->block   = start_block->block + device->bof;
1218         tape_34xx_merge_sbid(device, start_block);
1219         tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
1220         tape_ccw_cc(request->cpaddr + 2, READ_BLOCK_ID, 8, request->cpdata);
1221 }
1222 #endif
1223
1224 /*
1225  * List of 3480/3490 magnetic tape commands.
1226  */
1227 static tape_mtop_fn tape_34xx_mtop[TAPE_NR_MTOPS] = {
1228         [MTRESET]        = tape_std_mtreset,
1229         [MTFSF]          = tape_std_mtfsf,
1230         [MTBSF]          = tape_std_mtbsf,
1231         [MTFSR]          = tape_std_mtfsr,
1232         [MTBSR]          = tape_std_mtbsr,
1233         [MTWEOF]         = tape_std_mtweof,
1234         [MTREW]          = tape_std_mtrew,
1235         [MTOFFL]         = tape_std_mtoffl,
1236         [MTNOP]          = tape_std_mtnop,
1237         [MTRETEN]        = tape_std_mtreten,
1238         [MTBSFM]         = tape_std_mtbsfm,
1239         [MTFSFM]         = tape_std_mtfsfm,
1240         [MTEOM]          = tape_std_mteom,
1241         [MTERASE]        = tape_std_mterase,
1242         [MTRAS1]         = NULL,
1243         [MTRAS2]         = NULL,
1244         [MTRAS3]         = NULL,
1245         [MTSETBLK]       = tape_std_mtsetblk,
1246         [MTSETDENSITY]   = NULL,
1247         [MTSEEK]         = tape_34xx_mtseek,
1248         [MTTELL]         = tape_34xx_mttell,
1249         [MTSETDRVBUFFER] = NULL,
1250         [MTFSS]          = NULL,
1251         [MTBSS]          = NULL,
1252         [MTWSM]          = NULL,
1253         [MTLOCK]         = NULL,
1254         [MTUNLOCK]       = NULL,
1255         [MTLOAD]         = tape_std_mtload,
1256         [MTUNLOAD]       = tape_std_mtunload,
1257         [MTCOMPRESSION]  = tape_std_mtcompression,
1258         [MTSETPART]      = NULL,
1259         [MTMKPART]       = NULL
1260 };
1261
1262 /*
1263  * Tape discipline structure for 3480 and 3490.
1264  */
1265 static struct tape_discipline tape_discipline_34xx = {
1266         .owner = THIS_MODULE,
1267         .setup_device = tape_34xx_setup_device,
1268         .cleanup_device = tape_34xx_cleanup_device,
1269         .process_eov = tape_std_process_eov,
1270         .irq = tape_34xx_irq,
1271         .read_block = tape_std_read_block,
1272         .write_block = tape_std_write_block,
1273 #ifdef CONFIG_S390_TAPE_BLOCK
1274         .bread = tape_34xx_bread,
1275         .free_bread = tape_34xx_free_bread,
1276         .check_locate = tape_34xx_check_locate,
1277 #endif
1278         .ioctl_fn = tape_34xx_ioctl,
1279         .mtop_array = tape_34xx_mtop
1280 };
1281
1282 static struct ccw_device_id tape_34xx_ids[] = {
1283         { CCW_DEVICE_DEVTYPE(0x3480, 0, 0x3480, 0), .driver_info = tape_3480},
1284         { CCW_DEVICE_DEVTYPE(0x3490, 0, 0x3490, 0), .driver_info = tape_3490},
1285         { /* end of list */ },
1286 };
1287
1288 static int
1289 tape_34xx_online(struct ccw_device *cdev)
1290 {
1291         return tape_generic_online(
1292                 cdev->dev.driver_data,
1293                 &tape_discipline_34xx
1294         );
1295 }
1296
1297 static int
1298 tape_34xx_offline(struct ccw_device *cdev)
1299 {
1300         return tape_generic_offline(cdev->dev.driver_data);
1301 }
1302
1303 static struct ccw_driver tape_34xx_driver = {
1304         .name = "tape_34xx",
1305         .owner = THIS_MODULE,
1306         .ids = tape_34xx_ids,
1307         .probe = tape_generic_probe,
1308         .remove = tape_generic_remove,
1309         .set_online = tape_34xx_online,
1310         .set_offline = tape_34xx_offline,
1311 };
1312
1313 static int
1314 tape_34xx_init (void)
1315 {
1316         int rc;
1317
1318         TAPE_DBF_AREA = debug_register ( "tape_34xx", 2, 2, 4*sizeof(long));
1319         debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1320 #ifdef DBF_LIKE_HELL
1321         debug_set_level(TAPE_DBF_AREA, 6);
1322 #endif
1323
1324         DBF_EVENT(3, "34xx init\n");
1325         /* Register driver for 3480/3490 tapes. */
1326         rc = ccw_driver_register(&tape_34xx_driver);
1327         if (rc)
1328                 DBF_EVENT(3, "34xx init failed\n");
1329         else
1330                 DBF_EVENT(3, "34xx registered\n");
1331         return rc;
1332 }
1333
1334 static void
1335 tape_34xx_exit(void)
1336 {
1337         ccw_driver_unregister(&tape_34xx_driver);
1338
1339         debug_unregister(TAPE_DBF_AREA);
1340 }
1341
1342 MODULE_DEVICE_TABLE(ccw, tape_34xx_ids);
1343 MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH");
1344 MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape device driver");
1345 MODULE_LICENSE("GPL");
1346
1347 module_init(tape_34xx_init);
1348 module_exit(tape_34xx_exit);