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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 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/bio.h>
  14 #include <linux/workqueue.h>
  15
  16 #define TAPE_DBF_AREA   tape_34xx_dbf
  17
  18 #include "tape.h"
  19 #include "tape_std.h"
  20
  21 #define PRINTK_HEADER "TAPE_34XX: "
  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                 PRINT_WARN("Unsolicited IRQ (Device End) caught.\n");
 207                 tape_dump_sense(device, NULL, irb);
 208         }
 209         return TAPE_IO_SUCCESS;
 210 }
 211
 212 /*
 213  * Read Opposite Error Recovery Function:
 214  * Used, when Read Forward does not work
 215  */
 216 static int
 217 tape_34xx_erp_read_opposite(struct tape_device *device,
 218                             struct tape_request *request)
 219 {
 220         if (request->op == TO_RFO) {
 221                 /*
 222                  * We did read forward, but the data could not be read
 223                  * *correctly*. We transform the request to a read backward
 224                  * and try again.
 225                  */
 226                 tape_std_read_backward(device, request);
 227                 return tape_34xx_erp_retry(request);
 228         }
 229         if (request->op != TO_RBA)
 230                 PRINT_ERR("read_opposite called with state:%s\n",
 231                           tape_op_verbose[request->op]);
 232         /*
 233          * We tried to read forward and backward, but hat no
 234          * success -> failed.
 235          */
 236         return tape_34xx_erp_failed(request, -EIO);
 237 }
 238
 239 static int
 240 tape_34xx_erp_bug(struct tape_device *device, struct tape_request *request,
 241                   struct irb *irb, int no)
 242 {
 243         if (request->op != TO_ASSIGN) {
 244                 PRINT_WARN("An unexpected condition #%d was caught in "
 245                            "tape error recovery.\n", no);
 246                 PRINT_WARN("Please report this incident.\n");
 247                 if (request)
 248                         PRINT_WARN("Operation of tape:%s\n",
 249                                    tape_op_verbose[request->op]);
 250                 tape_dump_sense(device, request, irb);
 251         }
 252         return tape_34xx_erp_failed(request, -EIO);
 253 }
 254
 255 /*
 256  * Handle data overrun between cu and drive. The channel speed might
 257  * be too slow.
 258  */
 259 static int
 260 tape_34xx_erp_overrun(struct tape_device *device, struct tape_request *request,
 261                       struct irb *irb)
 262 {
 263         if (irb->ecw[3] == 0x40) {
 264                 PRINT_WARN ("Data overrun error between control-unit "
 265                             "and drive. Use a faster channel connection, "
 266                             "if possible! \n");
 267                 return tape_34xx_erp_failed(request, -EIO);
 268         }
 269         return tape_34xx_erp_bug(device, request, irb, -1);
 270 }
 271
 272 /*
 273  * Handle record sequence error.
 274  */
 275 static int
 276 tape_34xx_erp_sequence(struct tape_device *device,
 277                        struct tape_request *request, struct irb *irb)
 278 {
 279         if (irb->ecw[3] == 0x41) {
 280                 /*
 281                  * cu detected incorrect block-id sequence on tape.
 282                  */
 283                 PRINT_WARN("Illegal block-id sequence found!\n");
 284                 return tape_34xx_erp_failed(request, -EIO);
 285         }
 286         /*
 287          * Record sequence error bit is set, but erpa does not
 288          * show record sequence error.
 289          */
 290         return tape_34xx_erp_bug(device, request, irb, -2);
 291 }
 292
 293 /*
 294  * This function analyses the tape's sense-data in case of a unit-check.
 295  * If possible, it tries to recover from the error. Else the user is
 296  * informed about the problem.
 297  */
 298 static int
 299 tape_34xx_unit_check(struct tape_device *device, struct tape_request *request,
 300                      struct irb *irb)
 301 {
 302         int inhibit_cu_recovery;
 303         __u8* sense;
 304
 305         inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0;
 306         sense = irb->ecw;
 307
 308 #ifdef CONFIG_S390_TAPE_BLOCK
 309         if (request->op == TO_BLOCK) {
 310                 /*
 311                  * Recovery for block device requests. Set the block_position
 312                  * to something invalid and retry.
 313                  */
 314                 device->blk_data.block_position = -1;
 315                 if (request->retries-- <= 0)
 316                         return tape_34xx_erp_failed(request, -EIO);
 317                 else
 318                         return tape_34xx_erp_retry(request);
 319         }
 320 #endif
 321
 322         if (
 323                 sense[0] & SENSE_COMMAND_REJECT &&
 324                 sense[1] & SENSE_WRITE_PROTECT
 325         ) {
 326                 if (
 327                         request->op == TO_DSE ||
 328                         request->op == TO_WRI ||
 329                         request->op == TO_WTM
 330                 ) {
 331                         /* medium is write protected */
 332                         return tape_34xx_erp_failed(request, -EACCES);
 333                 } else {
 334                         return tape_34xx_erp_bug(device, request, irb, -3);
 335                 }
 336         }
 337
 338         /*
 339          * Special cases for various tape-states when reaching
 340          * end of recorded area
 341          *
 342          * FIXME: Maybe a special case of the special case:
 343          *        sense[0] == SENSE_EQUIPMENT_CHECK &&
 344          *        sense[1] == SENSE_DRIVE_ONLINE    &&
 345          *        sense[3] == 0x47 (Volume Fenced)
 346          *
 347          *        This was caused by continued FSF or FSR after an
 348          *        'End Of Data'.
 349          */
 350         if ((
 351                 sense[0] == SENSE_DATA_CHECK      ||
 352                 sense[0] == SENSE_EQUIPMENT_CHECK ||
 353                 sense[0] == SENSE_EQUIPMENT_CHECK + SENSE_DEFERRED_UNIT_CHECK
 354         ) && (
 355                 sense[1] == SENSE_DRIVE_ONLINE ||
 356                 sense[1] == SENSE_BEGINNING_OF_TAPE + SENSE_WRITE_MODE
 357         )) {
 358                 switch (request->op) {
 359                 /*
 360                  * sense[0] == SENSE_DATA_CHECK   &&
 361                  * sense[1] == SENSE_DRIVE_ONLINE
 362                  * sense[3] == 0x36 (End Of Data)
 363                  *
 364                  * Further seeks might return a 'Volume Fenced'.
 365                  */
 366                 case TO_FSF:
 367                 case TO_FSB:
 368                         /* Trying to seek beyond end of recorded area */
 369                         return tape_34xx_erp_failed(request, -ENOSPC);
 370                 case TO_BSB:
 371                         return tape_34xx_erp_retry(request);
 372
 373                 /*
 374                  * sense[0] == SENSE_DATA_CHECK   &&
 375                  * sense[1] == SENSE_DRIVE_ONLINE &&
 376                  * sense[3] == 0x36 (End Of Data)
 377                  */
 378                 case TO_LBL:
 379                         /* Block could not be located. */
 380                         tape_34xx_delete_sbid_from(device, 0);
 381                         return tape_34xx_erp_failed(request, -EIO);
 382
 383                 case TO_RFO:
 384                         /* Read beyond end of recorded area -> 0 bytes read */
 385                         return tape_34xx_erp_failed(request, 0);
 386
 387                 /*
 388                  * sense[0] == SENSE_EQUIPMENT_CHECK &&
 389                  * sense[1] == SENSE_DRIVE_ONLINE    &&
 390                  * sense[3] == 0x38 (Physical End Of Volume)
 391                  */
 392                 case TO_WRI:
 393                         /* Writing at physical end of volume */
 394                         return tape_34xx_erp_failed(request, -ENOSPC);
 395                 default:
 396                         PRINT_ERR("Invalid op in %s:%i\n",
 397                                   __func__, __LINE__);
 398                         return tape_34xx_erp_failed(request, 0);
 399                 }
 400         }
 401
 402         /* Sensing special bits */
 403         if (sense[0] & SENSE_BUS_OUT_CHECK)
 404                 return tape_34xx_erp_retry(request);
 405
 406         if (sense[0] & SENSE_DATA_CHECK) {
 407                 /*
 408                  * hardware failure, damaged tape or improper
 409                  * operating conditions
 410                  */
 411                 switch (sense[3]) {
 412                 case 0x23:
 413                         /* a read data check occurred */
 414                         if ((sense[2] & SENSE_TAPE_SYNC_MODE) ||
 415                             inhibit_cu_recovery)
 416                                 // data check is not permanent, may be
 417                                 // recovered. We always use async-mode with
 418                                 // cu-recovery, so this should *never* happen.
 419                                 return tape_34xx_erp_bug(device, request,
 420                                                          irb, -4);
 421
 422                         /* data check is permanent, CU recovery has failed */
 423                         PRINT_WARN("Permanent read error\n");
 424                         return tape_34xx_erp_failed(request, -EIO);
 425                 case 0x25:
 426                         // a write data check occurred
 427                         if ((sense[2] & SENSE_TAPE_SYNC_MODE) ||
 428                             inhibit_cu_recovery)
 429                                 // data check is not permanent, may be
 430                                 // recovered. We always use async-mode with
 431                                 // cu-recovery, so this should *never* happen.
 432                                 return tape_34xx_erp_bug(device, request,
 433                                                          irb, -5);
 434
 435                         // data check is permanent, cu-recovery has failed
 436                         PRINT_WARN("Permanent write error\n");
 437                         return tape_34xx_erp_failed(request, -EIO);
 438                 case 0x26:
 439                         /* Data Check (read opposite) occurred. */
 440                         return tape_34xx_erp_read_opposite(device, request);
 441                 case 0x28:
 442                         /* ID-Mark at tape start couldn't be written */
 443                         PRINT_WARN("ID-Mark could not be written.\n");
 444                         return tape_34xx_erp_failed(request, -EIO);
 445                 case 0x31:
 446                         /* Tape void. Tried to read beyond end of device. */
 447                         PRINT_WARN("Read beyond end of recorded area.\n");
 448                         return tape_34xx_erp_failed(request, -ENOSPC);
 449                 case 0x41:
 450                         /* Record sequence error. */
 451                         PRINT_WARN("Invalid block-id sequence found.\n");
 452                         return tape_34xx_erp_failed(request, -EIO);
 453                 default:
 454                         /* all data checks for 3480 should result in one of
 455                          * the above erpa-codes. For 3490, other data-check
 456                          * conditions do exist. */
 457                         if (device->cdev->id.driver_info == tape_3480)
 458                                 return tape_34xx_erp_bug(device, request,
 459                                                          irb, -6);
 460                 }
 461         }
 462
 463         if (sense[0] & SENSE_OVERRUN)
 464                 return tape_34xx_erp_overrun(device, request, irb);
 465
 466         if (sense[1] & SENSE_RECORD_SEQUENCE_ERR)
 467                 return tape_34xx_erp_sequence(device, request, irb);
 468
 469         /* Sensing erpa codes */
 470         switch (sense[3]) {
 471         case 0x00:
 472                 /* Unit check with erpa code 0. Report and ignore. */
 473                 PRINT_WARN("Non-error sense was found. "
 474                            "Unit-check will be ignored.\n");
 475                 return TAPE_IO_SUCCESS;
 476         case 0x21:
 477                 /*
 478                  * Data streaming not operational. CU will switch to
 479                  * interlock mode. Reissue the command.
 480                  */
 481                 PRINT_WARN("Data streaming not operational. "
 482                            "Switching to interlock-mode.\n");
 483                 return tape_34xx_erp_retry(request);
 484         case 0x22:
 485                 /*
 486                  * Path equipment check. Might be drive adapter error, buffer
 487                  * error on the lower interface, internal path not usable,
 488                  * or error during cartridge load.
 489                  */
 490                 PRINT_WARN("A path equipment check occurred. One of the "
 491                            "following conditions occurred:\n");
 492                 PRINT_WARN("drive adapter error, buffer error on the lower "
 493                            "interface, internal path not usable, error "
 494                            "during cartridge load.\n");
 495                 return tape_34xx_erp_failed(request, -EIO);
 496         case 0x24:
 497                 /*
 498                  * Load display check. Load display was command was issued,
 499                  * but the drive is displaying a drive check message. Can
 500                  * be threated as "device end".
 501                  */
 502                 return tape_34xx_erp_succeeded(request);
 503         case 0x27:
 504                 /*
 505                  * Command reject. May indicate illegal channel program or
 506                  * buffer over/underrun. Since all channel programs are
 507                  * issued by this driver and ought be correct, we assume a
 508                  * over/underrun situation and retry the channel program.
 509                  */
 510                 return tape_34xx_erp_retry(request);
 511         case 0x29:
 512                 /*
 513                  * Function incompatible. Either the tape is idrc compressed
 514                  * but the hardware isn't capable to do idrc, or a perform
 515                  * subsystem func is issued and the CU is not on-line.
 516                  */
 517                 PRINT_WARN ("Function incompatible. Try to switch off idrc\n");
 518                 return tape_34xx_erp_failed(request, -EIO);
 519         case 0x2a:
 520                 /*
 521                  * Unsolicited environmental data. An internal counter
 522                  * overflows, we can ignore this and reissue the cmd.
 523                  */
 524                 return tape_34xx_erp_retry(request);
 525         case 0x2b:
 526                 /*
 527                  * Environmental data present. Indicates either unload
 528                  * completed ok or read buffered log command completed ok.
 529                  */
 530                 if (request->op == TO_RUN) {
 531                         /* Rewind unload completed ok. */
 532                         tape_med_state_set(device, MS_UNLOADED);
 533                         return tape_34xx_erp_succeeded(request);
 534                 }
 535                 /* tape_34xx doesn't use read buffered log commands. */
 536                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 537         case 0x2c:
 538                 /*
 539                  * Permanent equipment check. CU has tried recovery, but
 540                  * did not succeed.
 541                  */
 542                 return tape_34xx_erp_failed(request, -EIO);
 543         case 0x2d:
 544                 /* Data security erase failure. */
 545                 if (request->op == TO_DSE)
 546                         return tape_34xx_erp_failed(request, -EIO);
 547                 /* Data security erase failure, but no such command issued. */
 548                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 549         case 0x2e:
 550                 /*
 551                  * Not capable. This indicates either that the drive fails
 552                  * reading the format id mark or that that format specified
 553                  * is not supported by the drive.
 554                  */
 555                 PRINT_WARN("Drive not capable processing the tape format!\n");
 556                 return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
 557         case 0x30:
 558                 /* The medium is write protected. */
 559                 PRINT_WARN("Medium is write protected!\n");
 560                 return tape_34xx_erp_failed(request, -EACCES);
 561         case 0x32:
 562                 // Tension loss. We cannot recover this, it's an I/O error.
 563                 PRINT_WARN("The drive lost tape tension.\n");
 564                 return tape_34xx_erp_failed(request, -EIO);
 565         case 0x33:
 566                 /*
 567                  * Load Failure. The cartridge was not inserted correctly or
 568                  * the tape is not threaded correctly.
 569                  */
 570                 PRINT_WARN("Cartridge load failure. Reload the cartridge "
 571                            "and try again.\n");
 572                 tape_34xx_delete_sbid_from(device, 0);
 573                 return tape_34xx_erp_failed(request, -EIO);
 574         case 0x34:
 575                 /*
 576                  * Unload failure. The drive cannot maintain tape tension
 577                  * and control tape movement during an unload operation.
 578                  */
 579                 PRINT_WARN("Failure during cartridge unload. "
 580                            "Please try manually.\n");
 581                 if (request->op == TO_RUN)
 582                         return tape_34xx_erp_failed(request, -EIO);
 583                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 584         case 0x35:
 585                 /*
 586                  * Drive equipment check. One of the following:
 587                  * - cu cannot recover from a drive detected error
 588                  * - a check code message is shown on drive display
 589                  * - the cartridge loader does not respond correctly
 590                  * - a failure occurs during an index, load, or unload cycle
 591                  */
 592                 PRINT_WARN("Equipment check! Please check the drive and "
 593                            "the cartridge loader.\n");
 594                 return tape_34xx_erp_failed(request, -EIO);
 595         case 0x36:
 596                 if (device->cdev->id.driver_info == tape_3490)
 597                         /* End of data. */
 598                         return tape_34xx_erp_failed(request, -EIO);
 599                 /* This erpa is reserved for 3480 */
 600                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 601         case 0x37:
 602                 /*
 603                  * Tape length error. The tape is shorter than reported in
 604                  * the beginning-of-tape data.
 605                  */
 606                 PRINT_WARN("Tape length error.\n");
 607                 return tape_34xx_erp_failed(request, -EIO);
 608         case 0x38:
 609                 /*
 610                  * Physical end of tape. A read/write operation reached
 611                  * the physical end of tape.
 612                  */
 613                 if (request->op==TO_WRI ||
 614                     request->op==TO_DSE ||
 615                     request->op==TO_WTM)
 616                         return tape_34xx_erp_failed(request, -ENOSPC);
 617                 return tape_34xx_erp_failed(request, -EIO);
 618         case 0x39:
 619                 /* Backward at Beginning of tape. */
 620                 return tape_34xx_erp_failed(request, -EIO);
 621         case 0x3a:
 622                 /* Drive switched to not ready. */
 623                 PRINT_WARN("Drive not ready. Turn the ready/not ready switch "
 624                            "to ready position and try again.\n");
 625                 return tape_34xx_erp_failed(request, -EIO);
 626         case 0x3b:
 627                 /* Manual rewind or unload. This causes an I/O error. */
 628                 PRINT_WARN("Medium was rewound or unloaded manually.\n");
 629                 tape_34xx_delete_sbid_from(device, 0);
 630                 return tape_34xx_erp_failed(request, -EIO);
 631         case 0x42:
 632                 /*
 633                  * Degraded mode. A condition that can cause degraded
 634                  * performance is detected.
 635                  */
 636                 PRINT_WARN("Subsystem is running in degraded mode.\n");
 637                 return tape_34xx_erp_retry(request);
 638         case 0x43:
 639                 /* Drive not ready. */
 640                 tape_34xx_delete_sbid_from(device, 0);
 641                 tape_med_state_set(device, MS_UNLOADED);
 642                 /* Some commands commands are successful even in this case */
 643                 if (sense[1] & SENSE_DRIVE_ONLINE) {
 644                         switch(request->op) {
 645                                 case TO_ASSIGN:
 646                                 case TO_UNASSIGN:
 647                                 case TO_DIS:
 648                                 case TO_NOP:
 649                                         return tape_34xx_done(request);
 650                                         break;
 651                                 default:
 652                                         break;
 653                         }
 654                 }
 655                 PRINT_WARN("The drive is not ready.\n");
 656                 return tape_34xx_erp_failed(request, -ENOMEDIUM);
 657         case 0x44:
 658                 /* Locate Block unsuccessful. */
 659                 if (request->op != TO_BLOCK && request->op != TO_LBL)
 660                         /* No locate block was issued. */
 661                         return tape_34xx_erp_bug(device, request,
 662                                                  irb, sense[3]);
 663                 return tape_34xx_erp_failed(request, -EIO);
 664         case 0x45:
 665                 /* The drive is assigned to a different channel path. */
 666                 PRINT_WARN("The drive is assigned elsewhere.\n");
 667                 return tape_34xx_erp_failed(request, -EIO);
 668         case 0x46:
 669                 /*
 670                  * Drive not on-line. Drive may be switched offline,
 671                  * the power supply may be switched off or
 672                  * the drive address may not be set correctly.
 673                  */
 674                 PRINT_WARN("The drive is not on-line.");
 675                 return tape_34xx_erp_failed(request, -EIO);
 676         case 0x47:
 677                 /* Volume fenced. CU reports volume integrity is lost. */
 678                 PRINT_WARN("Volume fenced. The volume integrity is lost.\n");
 679                 tape_34xx_delete_sbid_from(device, 0);
 680                 return tape_34xx_erp_failed(request, -EIO);
 681         case 0x48:
 682                 /* Log sense data and retry request. */
 683                 return tape_34xx_erp_retry(request);
 684         case 0x49:
 685                 /* Bus out check. A parity check error on the bus was found. */
 686                 PRINT_WARN("Bus out check. A data transfer over the bus "
 687                            "has been corrupted.\n");
 688                 return tape_34xx_erp_failed(request, -EIO);
 689         case 0x4a:
 690                 /* Control unit erp failed. */
 691                 PRINT_WARN("The control unit I/O error recovery failed.\n");
 692                 return tape_34xx_erp_failed(request, -EIO);
 693         case 0x4b:
 694                 /*
 695                  * CU and drive incompatible. The drive requests micro-program
 696                  * patches, which are not available on the CU.
 697                  */
 698                 PRINT_WARN("The drive needs microprogram patches from the "
 699                            "control unit, which are not available.\n");
 700                 return tape_34xx_erp_failed(request, -EIO);
 701         case 0x4c:
 702                 /*
 703                  * Recovered Check-One failure. Cu develops a hardware error,
 704                  * but is able to recover.
 705                  */
 706                 return tape_34xx_erp_retry(request);
 707         case 0x4d:
 708                 if (device->cdev->id.driver_info == tape_3490)
 709                         /*
 710                          * Resetting event received. Since the driver does
 711                          * not support resetting event recovery (which has to
 712                          * be handled by the I/O Layer), retry our command.
 713                          */
 714                         return tape_34xx_erp_retry(request);
 715                 /* This erpa is reserved for 3480. */
 716                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 717         case 0x4e:
 718                 if (device->cdev->id.driver_info == tape_3490) {
 719                         /*
 720                          * Maximum block size exceeded. This indicates, that
 721                          * the block to be written is larger than allowed for
 722                          * buffered mode.
 723                          */
 724                         PRINT_WARN("Maximum block size for buffered "
 725                                    "mode exceeded.\n");
 726                         return tape_34xx_erp_failed(request, -ENOBUFS);
 727                 }
 728                 /* This erpa is reserved for 3480. */
 729                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 730         case 0x50:
 731                 /*
 732                  * Read buffered log (Overflow). CU is running in extended
 733                  * buffered log mode, and a counter overflows. This should
 734                  * never happen, since we're never running in extended
 735                  * buffered log mode.
 736                  */
 737                 return tape_34xx_erp_retry(request);
 738         case 0x51:
 739                 /*
 740                  * Read buffered log (EOV). EOF processing occurs while the
 741                  * CU is in extended buffered log mode. This should never
 742                  * happen, since we're never running in extended buffered
 743                  * log mode.
 744                  */
 745                 return tape_34xx_erp_retry(request);
 746         case 0x52:
 747                 /* End of Volume complete. Rewind unload completed ok. */
 748                 if (request->op == TO_RUN) {
 749                         tape_med_state_set(device, MS_UNLOADED);
 750                         tape_34xx_delete_sbid_from(device, 0);
 751                         return tape_34xx_erp_succeeded(request);
 752                 }
 753                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 754         case 0x53:
 755                 /* Global command intercept. */
 756                 return tape_34xx_erp_retry(request);
 757         case 0x54:
 758                 /* Channel interface recovery (temporary). */
 759                 return tape_34xx_erp_retry(request);
 760         case 0x55:
 761                 /* Channel interface recovery (permanent). */
 762                 PRINT_WARN("A permanent channel interface error occurred.\n");
 763                 return tape_34xx_erp_failed(request, -EIO);
 764         case 0x56:
 765                 /* Channel protocol error. */
 766                 PRINT_WARN("A channel protocol error occurred.\n");
 767                 return tape_34xx_erp_failed(request, -EIO);
 768         case 0x57:
 769                 if (device->cdev->id.driver_info == tape_3480) {
 770                         /* Attention intercept. */
 771                         PRINT_WARN("An attention intercept occurred, "
 772                                    "which will be recovered.\n");
 773                         return tape_34xx_erp_retry(request);
 774                 } else {
 775                         /* Global status intercept. */
 776                         PRINT_WARN("An global status intercept was received, "
 777                                    "which will be recovered.\n");
 778                         return tape_34xx_erp_retry(request);
 779                 }
 780         case 0x5a:
 781                 /*
 782                  * Tape length incompatible. The tape inserted is too long,
 783                  * which could cause damage to the tape or the drive.
 784                  */
 785                 PRINT_WARN("Tape Length Incompatible\n");
 786                 PRINT_WARN("Tape length exceeds IBM enhanced capacity "
 787                         "cartdridge length or a medium\n");
 788                 PRINT_WARN("with EC-CST identification mark has been mounted "
 789                         "in a device that writes\n");
 790                 PRINT_WARN("3480 or 3480 XF format.\n");
 791                 return tape_34xx_erp_failed(request, -EIO);
 792         case 0x5b:
 793                 /* Format 3480 XF incompatible */
 794                 if (sense[1] & SENSE_BEGINNING_OF_TAPE)
 795                         /* The tape will get overwritten. */
 796                         return tape_34xx_erp_retry(request);
 797                 PRINT_WARN("Format 3480 XF Incompatible\n");
 798                 PRINT_WARN("Medium has been created in 3480 format. "
 799                         "To change the format writes\n");
 800                 PRINT_WARN("must be issued at BOT.\n");
 801                 return tape_34xx_erp_failed(request, -EIO);
 802         case 0x5c:
 803                 /* Format 3480-2 XF incompatible */
 804                 PRINT_WARN("Format 3480-2 XF Incompatible\n");
 805                 PRINT_WARN("Device can only read 3480 or 3480 XF format.\n");
 806                 return tape_34xx_erp_failed(request, -EIO);
 807         case 0x5d:
 808                 /* Tape length violation. */
 809                 PRINT_WARN("Tape Length Violation\n");
 810                 PRINT_WARN("The mounted tape exceeds IBM Enhanced Capacity "
 811                         "Cartdridge System Tape length.\n");
 812                 PRINT_WARN("This may cause damage to the drive or tape when "
 813                         "processing to the EOV\n");
 814                 return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
 815         case 0x5e:
 816                 /* Compaction algorithm incompatible. */
 817                 PRINT_WARN("Compaction Algorithm Incompatible\n");
 818                 PRINT_WARN("The volume is recorded using an incompatible "
 819                         "compaction algorithm,\n");
 820                 PRINT_WARN("which is not supported by the device.\n");
 821                 return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
 822
 823                 /* The following erpas should have been covered earlier. */
 824         case 0x23: /* Read data check. */
 825         case 0x25: /* Write data check. */
 826         case 0x26: /* Data check (read opposite). */
 827         case 0x28: /* Write id mark check. */
 828         case 0x31: /* Tape void. */
 829         case 0x40: /* Overrun error. */
 830         case 0x41: /* Record sequence error. */
 831                 /* All other erpas are reserved for future use. */
 832         default:
 833                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
 834         }
 835 }
 836
 837 /*
 838  * 3480/3490 interrupt handler
 839  */
 840 static int
 841 tape_34xx_irq(struct tape_device *device, struct tape_request *request,
 842               struct irb *irb)
 843 {
 844         if (request == NULL)
 845                 return tape_34xx_unsolicited_irq(device, irb);
 846
 847         if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) &&
 848             (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) &&
 849             (request->op == TO_WRI)) {
 850                 /* Write at end of volume */
 851                 PRINT_INFO("End of volume\n"); /* XXX */
 852                 return tape_34xx_erp_failed(request, -ENOSPC);
 853         }
 854
 855         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 856                 return tape_34xx_unit_check(device, request, irb);
 857
 858         if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
 859                 /*
 860                  * A unit exception occurs on skipping over a tapemark block.
 861                  */
 862                 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
 863                         if (request->op == TO_BSB || request->op == TO_FSB)
 864                                 request->rescnt++;
 865                         else
 866                                 DBF_EVENT(5, "Unit Exception!\n");
 867                 }
 868                 return tape_34xx_done(request);
 869         }
 870
 871         DBF_EVENT(6, "xunknownirq\n");
 872         PRINT_ERR("Unexpected interrupt.\n");
 873         PRINT_ERR("Current op is: %s", tape_op_verbose[request->op]);
 874         tape_dump_sense(device, request, irb);
 875         return TAPE_IO_STOP;
 876 }
 877
 878 /*
 879  * ioctl_overload
 880  */
 881 static int
 882 tape_34xx_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
 883 {
 884         if (cmd == TAPE390_DISPLAY) {
 885                 struct display_struct disp;
 886
 887                 if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)) != 0)
 888                         return -EFAULT;
 889
 890                 return tape_std_display(device, &disp);
 891         } else
 892                 return -EINVAL;
 893 }
 894
 895 static inline void
 896 tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l)
 897 {
 898         struct tape_34xx_sbid * new_sbid;
 899
 900         new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC);
 901         if (!new_sbid)
 902                 return;
 903
 904         new_sbid->bid = bid;
 905         list_add(&new_sbid->list, l);
 906 }
 907
 908 /*
 909  * Build up the search block ID list. The block ID consists of a logical
 910  * block number and a hardware specific part. The hardware specific part
 911  * helps the tape drive to speed up searching for a specific block.
 912  */
 913 static void
 914 tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid)
 915 {
 916         struct list_head *      sbid_list;
 917         struct tape_34xx_sbid * sbid;
 918         struct list_head *      l;
 919
 920         /*
 921          * immediately return if there is no list at all or the block to add
 922          * is located in segment 1 of wrap 0 because this position is used
 923          * if no hardware position data is supplied.
 924          */
 925         sbid_list = (struct list_head *) device->discdata;
 926         if (!sbid_list || (bid.segment < 2 && bid.wrap == 0))
 927                 return;
 928
 929         /*
 930          * Search the position where to insert the new entry. Hardware
 931          * acceleration uses only the segment and wrap number. So we
 932          * need only one entry for a specific wrap/segment combination.
 933          * If there is a block with a lower number but the same hard-
 934          * ware position data we just update the block number in the
 935          * existing entry.
 936          */
 937         list_for_each(l, sbid_list) {
 938                 sbid = list_entry(l, struct tape_34xx_sbid, list);
 939
 940                 if (
 941                         (sbid->bid.segment == bid.segment) &&
 942                         (sbid->bid.wrap    == bid.wrap)
 943                 ) {
 944                         if (bid.block < sbid->bid.block)
 945                                 sbid->bid = bid;
 946                         else return;
 947                         break;
 948                 }
 949
 950                 /* Sort in according to logical block number. */
 951                 if (bid.block < sbid->bid.block) {
 952                         tape_34xx_append_new_sbid(bid, l->prev);
 953                         break;
 954                 }
 955         }
 956         /* List empty or new block bigger than last entry. */
 957         if (l == sbid_list)
 958                 tape_34xx_append_new_sbid(bid, l->prev);
 959
 960         DBF_LH(4, "Current list is:\n");
 961         list_for_each(l, sbid_list) {
 962                 sbid = list_entry(l, struct tape_34xx_sbid, list);
 963                 DBF_LH(4, "%d:%03d@%05d\n",
 964                         sbid->bid.wrap,
 965                         sbid->bid.segment,
 966                         sbid->bid.block
 967                 );
 968         }
 969 }
 970
 971 /*
 972  * Delete all entries from the search block ID list that belong to tape blocks
 973  * equal or higher than the given number.
 974  */
 975 static void
 976 tape_34xx_delete_sbid_from(struct tape_device *device, int from)
 977 {
 978         struct list_head *      sbid_list;
 979         struct tape_34xx_sbid * sbid;
 980         struct list_head *      l;
 981         struct list_head *      n;
 982
 983         sbid_list = (struct list_head *) device->discdata;
 984         if (!sbid_list)
 985                 return;
 986
 987         list_for_each_safe(l, n, sbid_list) {
 988                 sbid = list_entry(l, struct tape_34xx_sbid, list);
 989                 if (sbid->bid.block >= from) {
 990                         DBF_LH(4, "Delete sbid %d:%03d@%05d\n",
 991                                 sbid->bid.wrap,
 992                                 sbid->bid.segment,
 993                                 sbid->bid.block
 994                         );
 995                         list_del(l);
 996                         kfree(sbid);
 997                 }
 998         }
 999 }
1000
1001 /*
1002  * Merge hardware position data into a block id.
1003  */
1004 static void
1005 tape_34xx_merge_sbid(
1006         struct tape_device *            device,
1007         struct tape_34xx_block_id *     bid
1008 ) {
1009         struct tape_34xx_sbid * sbid;
1010         struct tape_34xx_sbid * sbid_to_use;
1011         struct list_head *      sbid_list;
1012         struct list_head *      l;
1013
1014         sbid_list = (struct list_head *) device->discdata;
1015         bid->wrap    = 0;
1016         bid->segment = 1;
1017
1018         if (!sbid_list || list_empty(sbid_list))
1019                 return;
1020
1021         sbid_to_use = NULL;
1022         list_for_each(l, sbid_list) {
1023                 sbid = list_entry(l, struct tape_34xx_sbid, list);
1024
1025                 if (sbid->bid.block >= bid->block)
1026                         break;
1027                 sbid_to_use = sbid;
1028         }
1029         if (sbid_to_use) {
1030                 bid->wrap    = sbid_to_use->bid.wrap;
1031                 bid->segment = sbid_to_use->bid.segment;
1032                 DBF_LH(4, "Use %d:%03d@%05d for %05d\n",
1033                         sbid_to_use->bid.wrap,
1034                         sbid_to_use->bid.segment,
1035                         sbid_to_use->bid.block,
1036                         bid->block
1037                 );
1038         }
1039 }
1040
1041 static int
1042 tape_34xx_setup_device(struct tape_device * device)
1043 {
1044         int                     rc;
1045         struct list_head *      discdata;
1046
1047         DBF_EVENT(6, "34xx device setup\n");
1048         if ((rc = tape_std_assign(device)) == 0) {
1049                 if ((rc = tape_34xx_medium_sense(device)) != 0) {
1050                         DBF_LH(3, "34xx medium sense returned %d\n", rc);
1051                 }
1052         }
1053         discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL);
1054         if (discdata) {
1055                         INIT_LIST_HEAD(discdata);
1056                         device->discdata = discdata;
1057         }
1058
1059         return rc;
1060 }
1061
1062 static void
1063 tape_34xx_cleanup_device(struct tape_device *device)
1064 {
1065         tape_std_unassign(device);
1066
1067         if (device->discdata) {
1068                 tape_34xx_delete_sbid_from(device, 0);
1069                 kfree(device->discdata);
1070                 device->discdata = NULL;
1071         }
1072 }
1073
1074
1075 /*
1076  * MTTELL: Tell block. Return the number of block relative to current file.
1077  */
1078 static int
1079 tape_34xx_mttell(struct tape_device *device, int mt_count)
1080 {
1081         struct {
1082                 struct tape_34xx_block_id       cbid;
1083                 struct tape_34xx_block_id       dbid;
1084         } __attribute__ ((packed)) block_id;
1085         int rc;
1086
1087         rc = tape_std_read_block_id(device, (__u64 *) &block_id);
1088         if (rc)
1089                 return rc;
1090
1091         tape_34xx_add_sbid(device, block_id.cbid);
1092         return block_id.cbid.block;
1093 }
1094
1095 /*
1096  * MTSEEK: seek to the specified block.
1097  */
1098 static int
1099 tape_34xx_mtseek(struct tape_device *device, int mt_count)
1100 {
1101         struct tape_request *request;
1102         struct tape_34xx_block_id *     bid;
1103
1104         if (mt_count > 0x3fffff) {
1105                 DBF_EXCEPTION(6, "xsee parm\n");
1106                 return -EINVAL;
1107         }
1108         request = tape_alloc_request(3, 4);
1109         if (IS_ERR(request))
1110                 return PTR_ERR(request);
1111
1112         /* setup ccws */
1113         request->op = TO_LBL;
1114         bid         = (struct tape_34xx_block_id *) request->cpdata;
1115         bid->format = (*device->modeset_byte & 0x08) ?
1116                         TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480;
1117         bid->block  = mt_count;
1118         tape_34xx_merge_sbid(device, bid);
1119
1120         tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
1121         tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
1122         tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
1123
1124         /* execute it */
1125         return tape_do_io_free(device, request);
1126 }
1127
1128 #ifdef CONFIG_S390_TAPE_BLOCK
1129 /*
1130  * Tape block read for 34xx.
1131  */
1132 static struct tape_request *
1133 tape_34xx_bread(struct tape_device *device, struct request *req)
1134 {
1135         struct tape_request *request;
1136         struct ccw1 *ccw;
1137         int count = 0;
1138         unsigned off;
1139         char *dst;
1140         struct bio_vec *bv;
1141         struct req_iterator iter;
1142         struct tape_34xx_block_id *     start_block;
1143
1144         DBF_EVENT(6, "xBREDid:");
1145
1146         /* Count the number of blocks for the request. */
1147         rq_for_each_segment(bv, req, iter)
1148                 count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9);
1149
1150         /* Allocate the ccw request. */
1151         request = tape_alloc_request(3+count+1, 8);
1152         if (IS_ERR(request))
1153                 return request;
1154
1155         /* Setup ccws. */
1156         request->op = TO_BLOCK;
1157         start_block = (struct tape_34xx_block_id *) request->cpdata;
1158         start_block->block = req->sector >> TAPEBLOCK_HSEC_S2B;
1159         DBF_EVENT(6, "start_block = %i\n", start_block->block);
1160
1161         ccw = request->cpaddr;
1162         ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte);
1163
1164         /*
1165          * We always setup a nop after the mode set ccw. This slot is
1166          * used in tape_std_check_locate to insert a locate ccw if the
1167          * current tape position doesn't match the start block to be read.
1168          * The second nop will be filled with a read block id which is in
1169          * turn used by tape_34xx_free_bread to populate the segment bid
1170          * table.
1171          */
1172         ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
1173         ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
1174
1175         rq_for_each_segment(bv, req, iter) {
1176                 dst = kmap(bv->bv_page) + bv->bv_offset;
1177                 for (off = 0; off < bv->bv_len; off += TAPEBLOCK_HSEC_SIZE) {
1178                         ccw->flags = CCW_FLAG_CC;
1179                         ccw->cmd_code = READ_FORWARD;
1180                         ccw->count = TAPEBLOCK_HSEC_SIZE;
1181                         set_normalized_cda(ccw, (void*) __pa(dst));
1182                         ccw++;
1183                         dst += TAPEBLOCK_HSEC_SIZE;
1184                 }
1185         }
1186
1187         ccw = tape_ccw_end(ccw, NOP, 0, NULL);
1188         DBF_EVENT(6, "xBREDccwg\n");
1189         return request;
1190 }
1191
1192 static void
1193 tape_34xx_free_bread (struct tape_request *request)
1194 {
1195         struct ccw1* ccw;
1196
1197         ccw = request->cpaddr;
1198         if ((ccw + 2)->cmd_code == READ_BLOCK_ID) {
1199                 struct {
1200                         struct tape_34xx_block_id       cbid;
1201                         struct tape_34xx_block_id       dbid;
1202                 } __attribute__ ((packed)) *rbi_data;
1203
1204                 rbi_data = request->cpdata;
1205
1206                 if (request->device)
1207                         tape_34xx_add_sbid(request->device, rbi_data->cbid);
1208         }
1209
1210         /* Last ccw is a nop and doesn't need clear_normalized_cda */
1211         for (; ccw->flags & CCW_FLAG_CC; ccw++)
1212                 if (ccw->cmd_code == READ_FORWARD)
1213                         clear_normalized_cda(ccw);
1214         tape_free_request(request);
1215 }
1216
1217 /*
1218  * check_locate is called just before the tape request is passed to
1219  * the common io layer for execution. It has to check the current
1220  * tape position and insert a locate ccw if it doesn't match the
1221  * start block for the request.
1222  */
1223 static void
1224 tape_34xx_check_locate(struct tape_device *device, struct tape_request *request)
1225 {
1226         struct tape_34xx_block_id *     start_block;
1227
1228         start_block = (struct tape_34xx_block_id *) request->cpdata;
1229         if (start_block->block == device->blk_data.block_position)
1230                 return;
1231
1232         DBF_LH(4, "Block seek(%06d+%06d)\n", start_block->block, device->bof);
1233         start_block->wrap    = 0;
1234         start_block->segment = 1;
1235         start_block->format  = (*device->modeset_byte & 0x08) ?
1236                                 TAPE34XX_FMT_3480_XF :
1237                                 TAPE34XX_FMT_3480;
1238         start_block->block   = start_block->block + device->bof;
1239         tape_34xx_merge_sbid(device, start_block);
1240         tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
1241         tape_ccw_cc(request->cpaddr + 2, READ_BLOCK_ID, 8, request->cpdata);
1242 }
1243 #endif
1244
1245 /*
1246  * List of 3480/3490 magnetic tape commands.
1247  */
1248 static tape_mtop_fn tape_34xx_mtop[TAPE_NR_MTOPS] = {
1249         [MTRESET]        = tape_std_mtreset,
1250         [MTFSF]          = tape_std_mtfsf,
1251         [MTBSF]          = tape_std_mtbsf,
1252         [MTFSR]          = tape_std_mtfsr,
1253         [MTBSR]          = tape_std_mtbsr,
1254         [MTWEOF]         = tape_std_mtweof,
1255         [MTREW]          = tape_std_mtrew,
1256         [MTOFFL]         = tape_std_mtoffl,
1257         [MTNOP]          = tape_std_mtnop,
1258         [MTRETEN]        = tape_std_mtreten,
1259         [MTBSFM]         = tape_std_mtbsfm,
1260         [MTFSFM]         = tape_std_mtfsfm,
1261         [MTEOM]          = tape_std_mteom,
1262         [MTERASE]        = tape_std_mterase,
1263         [MTRAS1]         = NULL,
1264         [MTRAS2]         = NULL,
1265         [MTRAS3]         = NULL,
1266         [MTSETBLK]       = tape_std_mtsetblk,
1267         [MTSETDENSITY]   = NULL,
1268         [MTSEEK]         = tape_34xx_mtseek,
1269         [MTTELL]         = tape_34xx_mttell,
1270         [MTSETDRVBUFFER] = NULL,
1271         [MTFSS]          = NULL,
1272         [MTBSS]          = NULL,
1273         [MTWSM]          = NULL,
1274         [MTLOCK]         = NULL,
1275         [MTUNLOCK]       = NULL,
1276         [MTLOAD]         = tape_std_mtload,
1277         [MTUNLOAD]       = tape_std_mtunload,
1278         [MTCOMPRESSION]  = tape_std_mtcompression,
1279         [MTSETPART]      = NULL,
1280         [MTMKPART]       = NULL
1281 };
1282
1283 /*
1284  * Tape discipline structure for 3480 and 3490.
1285  */
1286 static struct tape_discipline tape_discipline_34xx = {
1287         .owner = THIS_MODULE,
1288         .setup_device = tape_34xx_setup_device,
1289         .cleanup_device = tape_34xx_cleanup_device,
1290         .process_eov = tape_std_process_eov,
1291         .irq = tape_34xx_irq,
1292         .read_block = tape_std_read_block,
1293         .write_block = tape_std_write_block,
1294 #ifdef CONFIG_S390_TAPE_BLOCK
1295         .bread = tape_34xx_bread,
1296         .free_bread = tape_34xx_free_bread,
1297         .check_locate = tape_34xx_check_locate,
1298 #endif
1299         .ioctl_fn = tape_34xx_ioctl,
1300         .mtop_array = tape_34xx_mtop
1301 };
1302
1303 static struct ccw_device_id tape_34xx_ids[] = {
1304         { CCW_DEVICE_DEVTYPE(0x3480, 0, 0x3480, 0), .driver_info = tape_3480},
1305         { CCW_DEVICE_DEVTYPE(0x3490, 0, 0x3490, 0), .driver_info = tape_3490},
1306         { /* end of list */ },
1307 };
1308
1309 static int
1310 tape_34xx_online(struct ccw_device *cdev)
1311 {
1312         return tape_generic_online(
1313                 cdev->dev.driver_data,
1314                 &tape_discipline_34xx
1315         );
1316 }
1317
1318 static int
1319 tape_34xx_offline(struct ccw_device *cdev)
1320 {
1321         return tape_generic_offline(cdev->dev.driver_data);
1322 }
1323
1324 static struct ccw_driver tape_34xx_driver = {
1325         .name = "tape_34xx",
1326         .owner = THIS_MODULE,
1327         .ids = tape_34xx_ids,
1328         .probe = tape_generic_probe,
1329         .remove = tape_generic_remove,
1330         .set_online = tape_34xx_online,
1331         .set_offline = tape_34xx_offline,
1332 };
1333
1334 static int
1335 tape_34xx_init (void)
1336 {
1337         int rc;
1338
1339         TAPE_DBF_AREA = debug_register ( "tape_34xx", 2, 2, 4*sizeof(long));
1340         debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1341 #ifdef DBF_LIKE_HELL
1342         debug_set_level(TAPE_DBF_AREA, 6);
1343 #endif
1344
1345         DBF_EVENT(3, "34xx init\n");
1346         /* Register driver for 3480/3490 tapes. */
1347         rc = ccw_driver_register(&tape_34xx_driver);
1348         if (rc)
1349                 DBF_EVENT(3, "34xx init failed\n");
1350         else
1351                 DBF_EVENT(3, "34xx registered\n");
1352         return rc;
1353 }
1354
1355 static void
1356 tape_34xx_exit(void)
1357 {
1358         ccw_driver_unregister(&tape_34xx_driver);
1359
1360         debug_unregister(TAPE_DBF_AREA);
1361 }
1362
1363 MODULE_DEVICE_TABLE(ccw, tape_34xx_ids);
1364 MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH");
1365 MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape device driver");
1366 MODULE_LICENSE("GPL");
1367
1368 module_init(tape_34xx_init);
1369 module_exit(tape_34xx_exit);