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[linux-2.6-omap-h63xx.git] / drivers / s390 / char / tape_34xx.c
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);