Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / 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 #include <linux/config.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/bio.h>
15 #include <linux/workqueue.h>
16
17 #define TAPE_DBF_AREA   tape_34xx_dbf
18
19 #include "tape.h"
20 #include "tape_std.h"
21
22 #define PRINTK_HEADER "TAPE_34XX: "
23
24 /*
25  * Pointer to debug area.
26  */
27 debug_info_t *TAPE_DBF_AREA = NULL;
28 EXPORT_SYMBOL(TAPE_DBF_AREA);
29
30 #define TAPE34XX_FMT_3480       0
31 #define TAPE34XX_FMT_3480_2_XF  1
32 #define TAPE34XX_FMT_3480_XF    2
33
34 struct tape_34xx_block_id {
35         unsigned int    wrap            : 1;
36         unsigned int    segment         : 7;
37         unsigned int    format          : 2;
38         unsigned int    block           : 22;
39 };
40
41 /*
42  * A list of block ID's is used to faster seek blocks.
43  */
44 struct tape_34xx_sbid {
45         struct list_head                list;
46         struct tape_34xx_block_id       bid;
47 };
48
49 static void tape_34xx_delete_sbid_from(struct tape_device *, int);
50
51 /*
52  * Medium sense for 34xx tapes. There is no 'real' medium sense call.
53  * So we just do a normal sense.
54  */
55 static int
56 tape_34xx_medium_sense(struct tape_device *device)
57 {
58         struct tape_request *request;
59         unsigned char       *sense;
60         int                  rc;
61
62         request = tape_alloc_request(1, 32);
63         if (IS_ERR(request)) {
64                 DBF_EXCEPTION(6, "MSEN fail\n");
65                 return PTR_ERR(request);
66         }
67
68         request->op = TO_MSEN;
69         tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata);
70
71         rc = tape_do_io_interruptible(device, request);
72         if (request->rc == 0) {
73                 sense = request->cpdata;
74
75                 /*
76                  * This isn't quite correct. But since INTERVENTION_REQUIRED
77                  * means that the drive is 'neither ready nor on-line' it is
78                  * only slightly inaccurate to say there is no tape loaded if
79                  * the drive isn't online...
80                  */
81                 if (sense[0] & SENSE_INTERVENTION_REQUIRED)
82                         tape_med_state_set(device, MS_UNLOADED);
83                 else
84                         tape_med_state_set(device, MS_LOADED);
85
86                 if (sense[1] & SENSE_WRITE_PROTECT)
87                         device->tape_generic_status |= GMT_WR_PROT(~0);
88                 else
89                         device->tape_generic_status &= ~GMT_WR_PROT(~0);
90         } else {
91                 DBF_EVENT(4, "tape_34xx: medium sense failed with rc=%d\n",
92                         request->rc);
93         }
94         tape_free_request(request);
95
96         return rc;
97 }
98
99 /*
100  * These functions are currently used only to schedule a medium_sense for
101  * later execution. This is because we get an interrupt whenever a medium
102  * is inserted but cannot call tape_do_io* from an interrupt context.
103  * Maybe that's useful for other actions we want to start from the
104  * interrupt handler.
105  */
106 static void
107 tape_34xx_work_handler(void *data)
108 {
109         struct {
110                 struct tape_device      *device;
111                 enum tape_op             op;
112                 struct work_struct       work;
113         } *p = data;
114
115         switch(p->op) {
116                 case TO_MSEN:
117                         tape_34xx_medium_sense(p->device);
118                         break;
119                 default:
120                         DBF_EVENT(3, "T34XX: internal error: unknown work\n");
121         }
122
123         p->device = tape_put_device(p->device);
124         kfree(p);
125 }
126
127 static int
128 tape_34xx_schedule_work(struct tape_device *device, enum tape_op op)
129 {
130         struct {
131                 struct tape_device      *device;
132                 enum tape_op             op;
133                 struct work_struct       work;
134         } *p;
135
136         if ((p = kmalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
137                 return -ENOMEM;
138
139         memset(p, 0, sizeof(*p));
140         INIT_WORK(&p->work, tape_34xx_work_handler, p);
141
142         p->device = tape_get_device_reference(device);
143         p->op     = op;
144
145         schedule_work(&p->work);
146         return 0;
147 }
148
149 /*
150  * Done Handler is called when dev stat = DEVICE-END (successful operation)
151  */
152 static inline int
153 tape_34xx_done(struct tape_request *request)
154 {
155         DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
156
157         switch (request->op) {
158                 case TO_DSE:
159                 case TO_RUN:
160                 case TO_WRI:
161                 case TO_WTM:
162                 case TO_ASSIGN:
163                 case TO_UNASSIGN:
164                         tape_34xx_delete_sbid_from(request->device, 0);
165                         break;
166                 default:
167                         ;
168         }
169         return TAPE_IO_SUCCESS;
170 }
171
172 static inline int
173 tape_34xx_erp_failed(struct tape_request *request, int rc)
174 {
175         DBF_EVENT(3, "Error recovery failed for %s (RC=%d)\n",
176                   tape_op_verbose[request->op], rc);
177         return rc;
178 }
179
180 static inline int
181 tape_34xx_erp_succeeded(struct tape_request *request)
182 {
183         DBF_EVENT(3, "Error Recovery successful for %s\n",
184                   tape_op_verbose[request->op]);
185         return tape_34xx_done(request);
186 }
187
188 static inline int
189 tape_34xx_erp_retry(struct tape_request *request)
190 {
191         DBF_EVENT(3, "xerp retr %s\n", tape_op_verbose[request->op]);
192         return TAPE_IO_RETRY;
193 }
194
195 /*
196  * This function is called, when no request is outstanding and we get an
197  * interrupt
198  */
199 static int
200 tape_34xx_unsolicited_irq(struct tape_device *device, struct irb *irb)
201 {
202         if (irb->scsw.dstat == 0x85 /* READY */) {
203                 /* A medium was inserted in the drive. */
204                 DBF_EVENT(6, "xuud med\n");
205                 tape_34xx_delete_sbid_from(device, 0);
206                 tape_34xx_schedule_work(device, TO_MSEN);
207         } else {
208                 DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id);
209                 PRINT_WARN("Unsolicited IRQ (Device End) caught.\n");
210                 tape_dump_sense(device, NULL, irb);
211         }
212         return TAPE_IO_SUCCESS;
213 }
214
215 /*
216  * Read Opposite Error Recovery Function:
217  * Used, when Read Forward does not work
218  */
219 static int
220 tape_34xx_erp_read_opposite(struct tape_device *device,
221                             struct tape_request *request)
222 {
223         if (request->op == TO_RFO) {
224                 /*
225                  * We did read forward, but the data could not be read
226                  * *correctly*. We transform the request to a read backward
227                  * and try again.
228                  */
229                 tape_std_read_backward(device, request);
230                 return tape_34xx_erp_retry(request);
231         }
232         if (request->op != TO_RBA)
233                 PRINT_ERR("read_opposite called with state:%s\n",
234                           tape_op_verbose[request->op]);
235         /*
236          * We tried to read forward and backward, but hat no
237          * success -> failed.
238          */
239         return tape_34xx_erp_failed(request, -EIO);
240 }
241
242 static int
243 tape_34xx_erp_bug(struct tape_device *device, struct tape_request *request,
244                   struct irb *irb, int no)
245 {
246         if (request->op != TO_ASSIGN) {
247                 PRINT_WARN("An unexpected condition #%d was caught in "
248                            "tape error recovery.\n", no);
249                 PRINT_WARN("Please report this incident.\n");
250                 if (request)
251                         PRINT_WARN("Operation of tape:%s\n",
252                                    tape_op_verbose[request->op]);
253                 tape_dump_sense(device, request, irb);
254         }
255         return tape_34xx_erp_failed(request, -EIO);
256 }
257
258 /*
259  * Handle data overrun between cu and drive. The channel speed might
260  * be too slow.
261  */
262 static int
263 tape_34xx_erp_overrun(struct tape_device *device, struct tape_request *request,
264                       struct irb *irb)
265 {
266         if (irb->ecw[3] == 0x40) {
267                 PRINT_WARN ("Data overrun error between control-unit "
268                             "and drive. Use a faster channel connection, "
269                             "if possible! \n");
270                 return tape_34xx_erp_failed(request, -EIO);
271         }
272         return tape_34xx_erp_bug(device, request, irb, -1);
273 }
274
275 /*
276  * Handle record sequence error.
277  */
278 static int
279 tape_34xx_erp_sequence(struct tape_device *device,
280                        struct tape_request *request, struct irb *irb)
281 {
282         if (irb->ecw[3] == 0x41) {
283                 /*
284                  * cu detected incorrect block-id sequence on tape.
285                  */
286                 PRINT_WARN("Illegal block-id sequence found!\n");
287                 return tape_34xx_erp_failed(request, -EIO);
288         }
289         /*
290          * Record sequence error bit is set, but erpa does not
291          * show record sequence error.
292          */
293         return tape_34xx_erp_bug(device, request, irb, -2);
294 }
295
296 /*
297  * This function analyses the tape's sense-data in case of a unit-check.
298  * If possible, it tries to recover from the error. Else the user is
299  * informed about the problem.
300  */
301 static int
302 tape_34xx_unit_check(struct tape_device *device, struct tape_request *request,
303                      struct irb *irb)
304 {
305         int inhibit_cu_recovery;
306         __u8* sense;
307
308         inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0;
309         sense = irb->ecw;
310
311 #ifdef CONFIG_S390_TAPE_BLOCK
312         if (request->op == TO_BLOCK) {
313                 /*
314                  * Recovery for block device requests. Set the block_position
315                  * to something invalid and retry.
316                  */
317                 device->blk_data.block_position = -1;
318                 if (request->retries-- <= 0)
319                         return tape_34xx_erp_failed(request, -EIO);
320                 else
321                         return tape_34xx_erp_retry(request);
322         }
323 #endif
324
325         if (
326                 sense[0] & SENSE_COMMAND_REJECT &&
327                 sense[1] & SENSE_WRITE_PROTECT
328         ) {
329                 if (
330                         request->op == TO_DSE ||
331                         request->op == TO_WRI ||
332                         request->op == TO_WTM
333                 ) {
334                         /* medium is write protected */
335                         return tape_34xx_erp_failed(request, -EACCES);
336                 } else {
337                         return tape_34xx_erp_bug(device, request, irb, -3);
338                 }
339         }
340
341         /*
342          * Special cases for various tape-states when reaching
343          * end of recorded area
344          *
345          * FIXME: Maybe a special case of the special case:
346          *        sense[0] == SENSE_EQUIPMENT_CHECK &&
347          *        sense[1] == SENSE_DRIVE_ONLINE    &&
348          *        sense[3] == 0x47 (Volume Fenced)
349          *
350          *        This was caused by continued FSF or FSR after an
351          *        'End Of Data'.
352          */
353         if ((
354                 sense[0] == SENSE_DATA_CHECK      ||
355                 sense[0] == SENSE_EQUIPMENT_CHECK ||
356                 sense[0] == SENSE_EQUIPMENT_CHECK + SENSE_DEFERRED_UNIT_CHECK
357         ) && (
358                 sense[1] == SENSE_DRIVE_ONLINE ||
359                 sense[1] == SENSE_BEGINNING_OF_TAPE + SENSE_WRITE_MODE
360         )) {
361                 switch (request->op) {
362                 /*
363                  * sense[0] == SENSE_DATA_CHECK   &&
364                  * sense[1] == SENSE_DRIVE_ONLINE
365                  * sense[3] == 0x36 (End Of Data)
366                  *
367                  * Further seeks might return a 'Volume Fenced'.
368                  */
369                 case TO_FSF:
370                 case TO_FSB:
371                         /* Trying to seek beyond end of recorded area */
372                         return tape_34xx_erp_failed(request, -ENOSPC);
373                 case TO_BSB:
374                         return tape_34xx_erp_retry(request);
375
376                 /*
377                  * sense[0] == SENSE_DATA_CHECK   &&
378                  * sense[1] == SENSE_DRIVE_ONLINE &&
379                  * sense[3] == 0x36 (End Of Data)
380                  */
381                 case TO_LBL:
382                         /* Block could not be located. */
383                         tape_34xx_delete_sbid_from(device, 0);
384                         return tape_34xx_erp_failed(request, -EIO);
385
386                 case TO_RFO:
387                         /* Read beyond end of recorded area -> 0 bytes read */
388                         return tape_34xx_erp_failed(request, 0);
389
390                 /*
391                  * sense[0] == SENSE_EQUIPMENT_CHECK &&
392                  * sense[1] == SENSE_DRIVE_ONLINE    &&
393                  * sense[3] == 0x38 (Physical End Of Volume)
394                  */
395                 case TO_WRI:
396                         /* Writing at physical end of volume */
397                         return tape_34xx_erp_failed(request, -ENOSPC);
398                 default:
399                         PRINT_ERR("Invalid op in %s:%i\n",
400                                   __FUNCTION__, __LINE__);
401                         return tape_34xx_erp_failed(request, 0);
402                 }
403         }
404
405         /* Sensing special bits */
406         if (sense[0] & SENSE_BUS_OUT_CHECK)
407                 return tape_34xx_erp_retry(request);
408
409         if (sense[0] & SENSE_DATA_CHECK) {
410                 /*
411                  * hardware failure, damaged tape or improper
412                  * operating conditions
413                  */
414                 switch (sense[3]) {
415                 case 0x23:
416                         /* a read data check occurred */
417                         if ((sense[2] & SENSE_TAPE_SYNC_MODE) ||
418                             inhibit_cu_recovery)
419                                 // data check is not permanent, may be
420                                 // recovered. We always use async-mode with
421                                 // cu-recovery, so this should *never* happen.
422                                 return tape_34xx_erp_bug(device, request,
423                                                          irb, -4);
424
425                         /* data check is permanent, CU recovery has failed */
426                         PRINT_WARN("Permanent read error\n");
427                         return tape_34xx_erp_failed(request, -EIO);
428                 case 0x25:
429                         // a write data check occurred
430                         if ((sense[2] & SENSE_TAPE_SYNC_MODE) ||
431                             inhibit_cu_recovery)
432                                 // data check is not permanent, may be
433                                 // recovered. We always use async-mode with
434                                 // cu-recovery, so this should *never* happen.
435                                 return tape_34xx_erp_bug(device, request,
436                                                          irb, -5);
437
438                         // data check is permanent, cu-recovery has failed
439                         PRINT_WARN("Permanent write error\n");
440                         return tape_34xx_erp_failed(request, -EIO);
441                 case 0x26:
442                         /* Data Check (read opposite) occurred. */
443                         return tape_34xx_erp_read_opposite(device, request);
444                 case 0x28:
445                         /* ID-Mark at tape start couldn't be written */
446                         PRINT_WARN("ID-Mark could not be written.\n");
447                         return tape_34xx_erp_failed(request, -EIO);
448                 case 0x31:
449                         /* Tape void. Tried to read beyond end of device. */
450                         PRINT_WARN("Read beyond end of recorded area.\n");
451                         return tape_34xx_erp_failed(request, -ENOSPC);
452                 case 0x41:
453                         /* Record sequence error. */
454                         PRINT_WARN("Invalid block-id sequence found.\n");
455                         return tape_34xx_erp_failed(request, -EIO);
456                 default:
457                         /* all data checks for 3480 should result in one of
458                          * the above erpa-codes. For 3490, other data-check
459                          * conditions do exist. */
460                         if (device->cdev->id.driver_info == tape_3480)
461                                 return tape_34xx_erp_bug(device, request,
462                                                          irb, -6);
463                 }
464         }
465
466         if (sense[0] & SENSE_OVERRUN)
467                 return tape_34xx_erp_overrun(device, request, irb);
468
469         if (sense[1] & SENSE_RECORD_SEQUENCE_ERR)
470                 return tape_34xx_erp_sequence(device, request, irb);
471
472         /* Sensing erpa codes */
473         switch (sense[3]) {
474         case 0x00:
475                 /* Unit check with erpa code 0. Report and ignore. */
476                 PRINT_WARN("Non-error sense was found. "
477                            "Unit-check will be ignored.\n");
478                 return TAPE_IO_SUCCESS;
479         case 0x21:
480                 /*
481                  * Data streaming not operational. CU will switch to
482                  * interlock mode. Reissue the command.
483                  */
484                 PRINT_WARN("Data streaming not operational. "
485                            "Switching to interlock-mode.\n");
486                 return tape_34xx_erp_retry(request);
487         case 0x22:
488                 /*
489                  * Path equipment check. Might be drive adapter error, buffer
490                  * error on the lower interface, internal path not usable,
491                  * or error during cartridge load.
492                  */
493                 PRINT_WARN("A path equipment check occurred. One of the "
494                            "following conditions occurred:\n");
495                 PRINT_WARN("drive adapter error, buffer error on the lower "
496                            "interface, internal path not usable, error "
497                            "during cartridge load.\n");
498                 return tape_34xx_erp_failed(request, -EIO);
499         case 0x24:
500                 /*
501                  * Load display check. Load display was command was issued,
502                  * but the drive is displaying a drive check message. Can
503                  * be threated as "device end".
504                  */
505                 return tape_34xx_erp_succeeded(request);
506         case 0x27:
507                 /*
508                  * Command reject. May indicate illegal channel program or
509                  * buffer over/underrun. Since all channel programs are
510                  * issued by this driver and ought be correct, we assume a
511                  * over/underrun situation and retry the channel program.
512                  */
513                 return tape_34xx_erp_retry(request);
514         case 0x29:
515                 /*
516                  * Function incompatible. Either the tape is idrc compressed
517                  * but the hardware isn't capable to do idrc, or a perform
518                  * subsystem func is issued and the CU is not on-line.
519                  */
520                 PRINT_WARN ("Function incompatible. Try to switch off idrc\n");
521                 return tape_34xx_erp_failed(request, -EIO);
522         case 0x2a:
523                 /*
524                  * Unsolicited environmental data. An internal counter
525                  * overflows, we can ignore this and reissue the cmd.
526                  */
527                 return tape_34xx_erp_retry(request);
528         case 0x2b:
529                 /*
530                  * Environmental data present. Indicates either unload
531                  * completed ok or read buffered log command completed ok.
532                  */
533                 if (request->op == TO_RUN) {
534                         /* Rewind unload completed ok. */
535                         tape_med_state_set(device, MS_UNLOADED);
536                         return tape_34xx_erp_succeeded(request);
537                 }
538                 /* tape_34xx doesn't use read buffered log commands. */
539                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
540         case 0x2c:
541                 /*
542                  * Permanent equipment check. CU has tried recovery, but
543                  * did not succeed.
544                  */
545                 return tape_34xx_erp_failed(request, -EIO);
546         case 0x2d:
547                 /* Data security erase failure. */
548                 if (request->op == TO_DSE)
549                         return tape_34xx_erp_failed(request, -EIO);
550                 /* Data security erase failure, but no such command issued. */
551                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
552         case 0x2e:
553                 /*
554                  * Not capable. This indicates either that the drive fails
555                  * reading the format id mark or that that format specified
556                  * is not supported by the drive.
557                  */
558                 PRINT_WARN("Drive not capable processing the tape format!\n");
559                 return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
560         case 0x30:
561                 /* The medium is write protected. */
562                 PRINT_WARN("Medium is write protected!\n");
563                 return tape_34xx_erp_failed(request, -EACCES);
564         case 0x32:
565                 // Tension loss. We cannot recover this, it's an I/O error.
566                 PRINT_WARN("The drive lost tape tension.\n");
567                 return tape_34xx_erp_failed(request, -EIO);
568         case 0x33:
569                 /*
570                  * Load Failure. The cartridge was not inserted correctly or
571                  * the tape is not threaded correctly.
572                  */
573                 PRINT_WARN("Cartridge load failure. Reload the cartridge "
574                            "and try again.\n");
575                 tape_34xx_delete_sbid_from(device, 0);
576                 return tape_34xx_erp_failed(request, -EIO);
577         case 0x34:
578                 /*
579                  * Unload failure. The drive cannot maintain tape tension
580                  * and control tape movement during an unload operation.
581                  */
582                 PRINT_WARN("Failure during cartridge unload. "
583                            "Please try manually.\n");
584                 if (request->op == TO_RUN)
585                         return tape_34xx_erp_failed(request, -EIO);
586                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
587         case 0x35:
588                 /*
589                  * Drive equipment check. One of the following:
590                  * - cu cannot recover from a drive detected error
591                  * - a check code message is shown on drive display
592                  * - the cartridge loader does not respond correctly
593                  * - a failure occurs during an index, load, or unload cycle
594                  */
595                 PRINT_WARN("Equipment check! Please check the drive and "
596                            "the cartridge loader.\n");
597                 return tape_34xx_erp_failed(request, -EIO);
598         case 0x36:
599                 if (device->cdev->id.driver_info == tape_3490)
600                         /* End of data. */
601                         return tape_34xx_erp_failed(request, -EIO);
602                 /* This erpa is reserved for 3480 */
603                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
604         case 0x37:
605                 /*
606                  * Tape length error. The tape is shorter than reported in
607                  * the beginning-of-tape data.
608                  */
609                 PRINT_WARN("Tape length error.\n");
610                 return tape_34xx_erp_failed(request, -EIO);
611         case 0x38:
612                 /*
613                  * Physical end of tape. A read/write operation reached
614                  * the physical end of tape.
615                  */
616                 if (request->op==TO_WRI ||
617                     request->op==TO_DSE ||
618                     request->op==TO_WTM)
619                         return tape_34xx_erp_failed(request, -ENOSPC);
620                 return tape_34xx_erp_failed(request, -EIO);
621         case 0x39:
622                 /* Backward at Beginning of tape. */
623                 return tape_34xx_erp_failed(request, -EIO);
624         case 0x3a:
625                 /* Drive switched to not ready. */
626                 PRINT_WARN("Drive not ready. Turn the ready/not ready switch "
627                            "to ready position and try again.\n");
628                 return tape_34xx_erp_failed(request, -EIO);
629         case 0x3b:
630                 /* Manual rewind or unload. This causes an I/O error. */
631                 PRINT_WARN("Medium was rewound or unloaded manually.\n");
632                 tape_34xx_delete_sbid_from(device, 0);
633                 return tape_34xx_erp_failed(request, -EIO);
634         case 0x42:
635                 /*
636                  * Degraded mode. A condition that can cause degraded
637                  * performance is detected.
638                  */
639                 PRINT_WARN("Subsystem is running in degraded mode.\n");
640                 return tape_34xx_erp_retry(request);
641         case 0x43:
642                 /* Drive not ready. */
643                 tape_34xx_delete_sbid_from(device, 0);
644                 tape_med_state_set(device, MS_UNLOADED);
645                 /* Some commands commands are successful even in this case */
646                 if (sense[1] & SENSE_DRIVE_ONLINE) {
647                         switch(request->op) {
648                                 case TO_ASSIGN:
649                                 case TO_UNASSIGN:
650                                 case TO_DIS:
651                                 case TO_NOP:
652                                         return tape_34xx_done(request);
653                                         break;
654                                 default:
655                                         break;
656                         }
657                 }
658                 PRINT_WARN("The drive is not ready.\n");
659                 return tape_34xx_erp_failed(request, -ENOMEDIUM);
660         case 0x44:
661                 /* Locate Block unsuccessful. */
662                 if (request->op != TO_BLOCK && request->op != TO_LBL)
663                         /* No locate block was issued. */
664                         return tape_34xx_erp_bug(device, request,
665                                                  irb, sense[3]);
666                 return tape_34xx_erp_failed(request, -EIO);
667         case 0x45:
668                 /* The drive is assigned to a different channel path. */
669                 PRINT_WARN("The drive is assigned elsewhere.\n");
670                 return tape_34xx_erp_failed(request, -EIO);
671         case 0x46:
672                 /*
673                  * Drive not on-line. Drive may be switched offline,
674                  * the power supply may be switched off or
675                  * the drive address may not be set correctly.
676                  */
677                 PRINT_WARN("The drive is not on-line.");
678                 return tape_34xx_erp_failed(request, -EIO);
679         case 0x47:
680                 /* Volume fenced. CU reports volume integrity is lost. */
681                 PRINT_WARN("Volume fenced. The volume integrity is lost.\n");
682                 tape_34xx_delete_sbid_from(device, 0);
683                 return tape_34xx_erp_failed(request, -EIO);
684         case 0x48:
685                 /* Log sense data and retry request. */
686                 return tape_34xx_erp_retry(request);
687         case 0x49:
688                 /* Bus out check. A parity check error on the bus was found. */
689                 PRINT_WARN("Bus out check. A data transfer over the bus "
690                            "has been corrupted.\n");
691                 return tape_34xx_erp_failed(request, -EIO);
692         case 0x4a:
693                 /* Control unit erp failed. */
694                 PRINT_WARN("The control unit I/O error recovery failed.\n");
695                 return tape_34xx_erp_failed(request, -EIO);
696         case 0x4b:
697                 /*
698                  * CU and drive incompatible. The drive requests micro-program
699                  * patches, which are not available on the CU.
700                  */
701                 PRINT_WARN("The drive needs microprogram patches from the "
702                            "control unit, which are not available.\n");
703                 return tape_34xx_erp_failed(request, -EIO);
704         case 0x4c:
705                 /*
706                  * Recovered Check-One failure. Cu develops a hardware error,
707                  * but is able to recover.
708                  */
709                 return tape_34xx_erp_retry(request);
710         case 0x4d:
711                 if (device->cdev->id.driver_info == tape_3490)
712                         /*
713                          * Resetting event received. Since the driver does
714                          * not support resetting event recovery (which has to
715                          * be handled by the I/O Layer), retry our command.
716                          */
717                         return tape_34xx_erp_retry(request);
718                 /* This erpa is reserved for 3480. */
719                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
720         case 0x4e:
721                 if (device->cdev->id.driver_info == tape_3490) {
722                         /*
723                          * Maximum block size exceeded. This indicates, that
724                          * the block to be written is larger than allowed for
725                          * buffered mode.
726                          */
727                         PRINT_WARN("Maximum block size for buffered "
728                                    "mode exceeded.\n");
729                         return tape_34xx_erp_failed(request, -ENOBUFS);
730                 }
731                 /* This erpa is reserved for 3480. */
732                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
733         case 0x50:
734                 /*
735                  * Read buffered log (Overflow). CU is running in extended
736                  * buffered log mode, and a counter overflows. This should
737                  * never happen, since we're never running in extended
738                  * buffered log mode.
739                  */
740                 return tape_34xx_erp_retry(request);
741         case 0x51:
742                 /*
743                  * Read buffered log (EOV). EOF processing occurs while the
744                  * CU is in extended buffered log mode. This should never
745                  * happen, since we're never running in extended buffered
746                  * log mode.
747                  */
748                 return tape_34xx_erp_retry(request);
749         case 0x52:
750                 /* End of Volume complete. Rewind unload completed ok. */
751                 if (request->op == TO_RUN) {
752                         tape_med_state_set(device, MS_UNLOADED);
753                         tape_34xx_delete_sbid_from(device, 0);
754                         return tape_34xx_erp_succeeded(request);
755                 }
756                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
757         case 0x53:
758                 /* Global command intercept. */
759                 return tape_34xx_erp_retry(request);
760         case 0x54:
761                 /* Channel interface recovery (temporary). */
762                 return tape_34xx_erp_retry(request);
763         case 0x55:
764                 /* Channel interface recovery (permanent). */
765                 PRINT_WARN("A permanent channel interface error occurred.\n");
766                 return tape_34xx_erp_failed(request, -EIO);
767         case 0x56:
768                 /* Channel protocol error. */
769                 PRINT_WARN("A channel protocol error occurred.\n");
770                 return tape_34xx_erp_failed(request, -EIO);
771         case 0x57:
772                 if (device->cdev->id.driver_info == tape_3480) {
773                         /* Attention intercept. */
774                         PRINT_WARN("An attention intercept occurred, "
775                                    "which will be recovered.\n");
776                         return tape_34xx_erp_retry(request);
777                 } else {
778                         /* Global status intercept. */
779                         PRINT_WARN("An global status intercept was received, "
780                                    "which will be recovered.\n");
781                         return tape_34xx_erp_retry(request);
782                 }
783         case 0x5a:
784                 /*
785                  * Tape length incompatible. The tape inserted is too long,
786                  * which could cause damage to the tape or the drive.
787                  */
788                 PRINT_WARN("Tape Length Incompatible\n");
789                 PRINT_WARN("Tape length exceeds IBM enhanced capacity "
790                         "cartdridge length or a medium\n");
791                 PRINT_WARN("with EC-CST identification mark has been mounted "
792                         "in a device that writes\n");
793                 PRINT_WARN("3480 or 3480 XF format.\n");
794                 return tape_34xx_erp_failed(request, -EIO);
795         case 0x5b:
796                 /* Format 3480 XF incompatible */
797                 if (sense[1] & SENSE_BEGINNING_OF_TAPE)
798                         /* The tape will get overwritten. */
799                         return tape_34xx_erp_retry(request);
800                 PRINT_WARN("Format 3480 XF Incompatible\n");
801                 PRINT_WARN("Medium has been created in 3480 format. "
802                         "To change the format writes\n");
803                 PRINT_WARN("must be issued at BOT.\n");
804                 return tape_34xx_erp_failed(request, -EIO);
805         case 0x5c:
806                 /* Format 3480-2 XF incompatible */
807                 PRINT_WARN("Format 3480-2 XF Incompatible\n");
808                 PRINT_WARN("Device can only read 3480 or 3480 XF format.\n");
809                 return tape_34xx_erp_failed(request, -EIO);
810         case 0x5d:
811                 /* Tape length violation. */
812                 PRINT_WARN("Tape Length Violation\n");
813                 PRINT_WARN("The mounted tape exceeds IBM Enhanced Capacity "
814                         "Cartdridge System Tape length.\n");
815                 PRINT_WARN("This may cause damage to the drive or tape when "
816                         "processing to the EOV\n");
817                 return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
818         case 0x5e:
819                 /* Compaction algorithm incompatible. */
820                 PRINT_WARN("Compaction Algorithm Incompatible\n");
821                 PRINT_WARN("The volume is recorded using an incompatible "
822                         "compaction algorithm,\n");
823                 PRINT_WARN("which is not supported by the device.\n");
824                 return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
825
826                 /* The following erpas should have been covered earlier. */
827         case 0x23: /* Read data check. */
828         case 0x25: /* Write data check. */
829         case 0x26: /* Data check (read opposite). */
830         case 0x28: /* Write id mark check. */
831         case 0x31: /* Tape void. */
832         case 0x40: /* Overrun error. */
833         case 0x41: /* Record sequence error. */
834                 /* All other erpas are reserved for future use. */
835         default:
836                 return tape_34xx_erp_bug(device, request, irb, sense[3]);
837         }
838 }
839
840 /*
841  * 3480/3490 interrupt handler
842  */
843 static int
844 tape_34xx_irq(struct tape_device *device, struct tape_request *request,
845               struct irb *irb)
846 {
847         if (request == NULL)
848                 return tape_34xx_unsolicited_irq(device, irb);
849
850         if ((irb->scsw.dstat & DEV_STAT_UNIT_EXCEP) &&
851             (irb->scsw.dstat & DEV_STAT_DEV_END) &&
852             (request->op == TO_WRI)) {
853                 /* Write at end of volume */
854                 PRINT_INFO("End of volume\n"); /* XXX */
855                 return tape_34xx_erp_failed(request, -ENOSPC);
856         }
857
858         if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
859                 return tape_34xx_unit_check(device, request, irb);
860
861         if (irb->scsw.dstat & DEV_STAT_DEV_END) {
862                 /*
863                  * A unit exception occurs on skipping over a tapemark block.
864                  */
865                 if (irb->scsw.dstat & DEV_STAT_UNIT_EXCEP) {
866                         if (request->op == TO_BSB || request->op == TO_FSB)
867                                 request->rescnt++;
868                         else
869                                 DBF_EVENT(5, "Unit Exception!\n");
870                 }
871                 return tape_34xx_done(request);
872         }
873
874         DBF_EVENT(6, "xunknownirq\n");
875         PRINT_ERR("Unexpected interrupt.\n");
876         PRINT_ERR("Current op is: %s", tape_op_verbose[request->op]);
877         tape_dump_sense(device, request, irb);
878         return TAPE_IO_STOP;
879 }
880
881 /*
882  * ioctl_overload
883  */
884 static int
885 tape_34xx_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
886 {
887         if (cmd == TAPE390_DISPLAY) {
888                 struct display_struct disp;
889
890                 if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)) != 0)
891                         return -EFAULT;
892
893                 return tape_std_display(device, &disp);
894         } else
895                 return -EINVAL;
896 }
897
898 static inline void
899 tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l)
900 {
901         struct tape_34xx_sbid * new_sbid;
902
903         new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC);
904         if (!new_sbid)
905                 return;
906
907         new_sbid->bid = bid;
908         list_add(&new_sbid->list, l);
909 }
910
911 /*
912  * Build up the search block ID list. The block ID consists of a logical
913  * block number and a hardware specific part. The hardware specific part
914  * helps the tape drive to speed up searching for a specific block.
915  */
916 static void
917 tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid)
918 {
919         struct list_head *      sbid_list;
920         struct tape_34xx_sbid * sbid;
921         struct list_head *      l;
922
923         /*
924          * immediately return if there is no list at all or the block to add
925          * is located in segment 1 of wrap 0 because this position is used
926          * if no hardware position data is supplied.
927          */
928         sbid_list = (struct list_head *) device->discdata;
929         if (!sbid_list || (bid.segment < 2 && bid.wrap == 0))
930                 return;
931
932         /*
933          * Search the position where to insert the new entry. Hardware
934          * acceleration uses only the segment and wrap number. So we
935          * need only one entry for a specific wrap/segment combination.
936          * If there is a block with a lower number but the same hard-
937          * ware position data we just update the block number in the
938          * existing entry.
939          */
940         list_for_each(l, sbid_list) {
941                 sbid = list_entry(l, struct tape_34xx_sbid, list);
942
943                 if (
944                         (sbid->bid.segment == bid.segment) &&
945                         (sbid->bid.wrap    == bid.wrap)
946                 ) {
947                         if (bid.block < sbid->bid.block)
948                                 sbid->bid = bid;
949                         else return;
950                         break;
951                 }
952
953                 /* Sort in according to logical block number. */
954                 if (bid.block < sbid->bid.block) {
955                         tape_34xx_append_new_sbid(bid, l->prev);
956                         break;
957                 }
958         }
959         /* List empty or new block bigger than last entry. */
960         if (l == sbid_list)
961                 tape_34xx_append_new_sbid(bid, l->prev);
962
963         DBF_LH(4, "Current list is:\n");
964         list_for_each(l, sbid_list) {
965                 sbid = list_entry(l, struct tape_34xx_sbid, list);
966                 DBF_LH(4, "%d:%03d@%05d\n",
967                         sbid->bid.wrap,
968                         sbid->bid.segment,
969                         sbid->bid.block
970                 );
971         }
972 }
973
974 /*
975  * Delete all entries from the search block ID list that belong to tape blocks
976  * equal or higher than the given number.
977  */
978 static void
979 tape_34xx_delete_sbid_from(struct tape_device *device, int from)
980 {
981         struct list_head *      sbid_list;
982         struct tape_34xx_sbid * sbid;
983         struct list_head *      l;
984         struct list_head *      n;
985
986         sbid_list = (struct list_head *) device->discdata;
987         if (!sbid_list)
988                 return;
989
990         list_for_each_safe(l, n, sbid_list) {
991                 sbid = list_entry(l, struct tape_34xx_sbid, list);
992                 if (sbid->bid.block >= from) {
993                         DBF_LH(4, "Delete sbid %d:%03d@%05d\n",
994                                 sbid->bid.wrap,
995                                 sbid->bid.segment,
996                                 sbid->bid.block
997                         );
998                         list_del(l);
999                         kfree(sbid);
1000                 }
1001         }
1002 }
1003
1004 /*
1005  * Merge hardware position data into a block id.
1006  */
1007 static void
1008 tape_34xx_merge_sbid(
1009         struct tape_device *            device,
1010         struct tape_34xx_block_id *     bid
1011 ) {
1012         struct tape_34xx_sbid * sbid;
1013         struct tape_34xx_sbid * sbid_to_use;
1014         struct list_head *      sbid_list;
1015         struct list_head *      l;
1016
1017         sbid_list = (struct list_head *) device->discdata;
1018         bid->wrap    = 0;
1019         bid->segment = 1;
1020
1021         if (!sbid_list || list_empty(sbid_list))
1022                 return;
1023
1024         sbid_to_use = NULL;
1025         list_for_each(l, sbid_list) {
1026                 sbid = list_entry(l, struct tape_34xx_sbid, list);
1027
1028                 if (sbid->bid.block >= bid->block)
1029                         break;
1030                 sbid_to_use = sbid;
1031         }
1032         if (sbid_to_use) {
1033                 bid->wrap    = sbid_to_use->bid.wrap;
1034                 bid->segment = sbid_to_use->bid.segment;
1035                 DBF_LH(4, "Use %d:%03d@%05d for %05d\n",
1036                         sbid_to_use->bid.wrap,
1037                         sbid_to_use->bid.segment,
1038                         sbid_to_use->bid.block,
1039                         bid->block
1040                 );
1041         }
1042 }
1043
1044 static int
1045 tape_34xx_setup_device(struct tape_device * device)
1046 {
1047         int                     rc;
1048         struct list_head *      discdata;
1049
1050         DBF_EVENT(6, "34xx device setup\n");
1051         if ((rc = tape_std_assign(device)) == 0) {
1052                 if ((rc = tape_34xx_medium_sense(device)) != 0) {
1053                         DBF_LH(3, "34xx medium sense returned %d\n", rc);
1054                 }
1055         }
1056         discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL);
1057         if (discdata) {
1058                         INIT_LIST_HEAD(discdata);
1059                         device->discdata = discdata;
1060         }
1061
1062         return rc;
1063 }
1064
1065 static void
1066 tape_34xx_cleanup_device(struct tape_device *device)
1067 {
1068         tape_std_unassign(device);
1069         
1070         if (device->discdata) {
1071                 tape_34xx_delete_sbid_from(device, 0);
1072                 kfree(device->discdata);
1073                 device->discdata = NULL;
1074         }
1075 }
1076
1077
1078 /*
1079  * MTTELL: Tell block. Return the number of block relative to current file.
1080  */
1081 static int
1082 tape_34xx_mttell(struct tape_device *device, int mt_count)
1083 {
1084         struct {
1085                 struct tape_34xx_block_id       cbid;
1086                 struct tape_34xx_block_id       dbid;
1087         } __attribute__ ((packed)) block_id;
1088         int rc;
1089
1090         rc = tape_std_read_block_id(device, (__u64 *) &block_id);
1091         if (rc)
1092                 return rc;
1093
1094         tape_34xx_add_sbid(device, block_id.cbid);
1095         return block_id.cbid.block;
1096 }
1097
1098 /*
1099  * MTSEEK: seek to the specified block.
1100  */
1101 static int
1102 tape_34xx_mtseek(struct tape_device *device, int mt_count)
1103 {
1104         struct tape_request *request;
1105         struct tape_34xx_block_id *     bid;
1106
1107         if (mt_count > 0x3fffff) {
1108                 DBF_EXCEPTION(6, "xsee parm\n");
1109                 return -EINVAL;
1110         }
1111         request = tape_alloc_request(3, 4);
1112         if (IS_ERR(request))
1113                 return PTR_ERR(request);
1114
1115         /* setup ccws */
1116         request->op = TO_LBL;
1117         bid         = (struct tape_34xx_block_id *) request->cpdata;
1118         bid->format = (*device->modeset_byte & 0x08) ?
1119                         TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480;
1120         bid->block  = mt_count;
1121         tape_34xx_merge_sbid(device, bid);
1122
1123         tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
1124         tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
1125         tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
1126
1127         /* execute it */
1128         return tape_do_io_free(device, request);
1129 }
1130
1131 #ifdef CONFIG_S390_TAPE_BLOCK
1132 /*
1133  * Tape block read for 34xx.
1134  */
1135 static struct tape_request *
1136 tape_34xx_bread(struct tape_device *device, struct request *req)
1137 {
1138         struct tape_request *request;
1139         struct ccw1 *ccw;
1140         int count = 0, i;
1141         unsigned off;
1142         char *dst;
1143         struct bio_vec *bv;
1144         struct bio *bio;
1145         struct tape_34xx_block_id *     start_block;
1146
1147         DBF_EVENT(6, "xBREDid:");
1148
1149         /* Count the number of blocks for the request. */
1150         rq_for_each_bio(bio, req) {
1151                 bio_for_each_segment(bv, bio, i) {
1152                         count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9);
1153                 }
1154         }
1155
1156         /* Allocate the ccw request. */
1157         request = tape_alloc_request(3+count+1, 8);
1158         if (IS_ERR(request))
1159                 return request;
1160
1161         /* Setup ccws. */
1162         request->op = TO_BLOCK;
1163         start_block = (struct tape_34xx_block_id *) request->cpdata;
1164         start_block->block = req->sector >> TAPEBLOCK_HSEC_S2B;
1165         DBF_EVENT(6, "start_block = %i\n", start_block->block);
1166
1167         ccw = request->cpaddr;
1168         ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte);
1169
1170         /*
1171          * We always setup a nop after the mode set ccw. This slot is
1172          * used in tape_std_check_locate to insert a locate ccw if the
1173          * current tape position doesn't match the start block to be read.
1174          * The second nop will be filled with a read block id which is in
1175          * turn used by tape_34xx_free_bread to populate the segment bid
1176          * table.
1177          */
1178         ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
1179         ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
1180
1181         rq_for_each_bio(bio, req) {
1182                 bio_for_each_segment(bv, bio, i) {
1183                         dst = kmap(bv->bv_page) + bv->bv_offset;
1184                         for (off = 0; off < bv->bv_len;
1185                              off += TAPEBLOCK_HSEC_SIZE) {
1186                                 ccw->flags = CCW_FLAG_CC;
1187                                 ccw->cmd_code = READ_FORWARD;
1188                                 ccw->count = TAPEBLOCK_HSEC_SIZE;
1189                                 set_normalized_cda(ccw, (void*) __pa(dst));
1190                                 ccw++;
1191                                 dst += TAPEBLOCK_HSEC_SIZE;
1192                         }
1193                 }
1194         }
1195
1196         ccw = tape_ccw_end(ccw, NOP, 0, NULL);
1197         DBF_EVENT(6, "xBREDccwg\n");
1198         return request;
1199 }
1200
1201 static void
1202 tape_34xx_free_bread (struct tape_request *request)
1203 {
1204         struct ccw1* ccw;
1205
1206         ccw = request->cpaddr;
1207         if ((ccw + 2)->cmd_code == READ_BLOCK_ID) {
1208                 struct {
1209                         struct tape_34xx_block_id       cbid;
1210                         struct tape_34xx_block_id       dbid;
1211                 } __attribute__ ((packed)) *rbi_data;
1212
1213                 rbi_data = request->cpdata;
1214
1215                 if (request->device)
1216                         tape_34xx_add_sbid(request->device, rbi_data->cbid);
1217         }
1218
1219         /* Last ccw is a nop and doesn't need clear_normalized_cda */
1220         for (; ccw->flags & CCW_FLAG_CC; ccw++)
1221                 if (ccw->cmd_code == READ_FORWARD)
1222                         clear_normalized_cda(ccw);
1223         tape_free_request(request);
1224 }
1225
1226 /*
1227  * check_locate is called just before the tape request is passed to
1228  * the common io layer for execution. It has to check the current
1229  * tape position and insert a locate ccw if it doesn't match the
1230  * start block for the request.
1231  */
1232 static void
1233 tape_34xx_check_locate(struct tape_device *device, struct tape_request *request)
1234 {
1235         struct tape_34xx_block_id *     start_block;
1236
1237         start_block = (struct tape_34xx_block_id *) request->cpdata;
1238         if (start_block->block == device->blk_data.block_position)
1239                 return;
1240
1241         DBF_LH(4, "Block seek(%06d+%06d)\n", start_block->block, device->bof);
1242         start_block->wrap    = 0;
1243         start_block->segment = 1;
1244         start_block->format  = (*device->modeset_byte & 0x08) ?
1245                                 TAPE34XX_FMT_3480_XF :
1246                                 TAPE34XX_FMT_3480;
1247         start_block->block   = start_block->block + device->bof;
1248         tape_34xx_merge_sbid(device, start_block);
1249         tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
1250         tape_ccw_cc(request->cpaddr + 2, READ_BLOCK_ID, 8, request->cpdata);
1251 }
1252 #endif
1253
1254 /*
1255  * List of 3480/3490 magnetic tape commands.
1256  */
1257 static tape_mtop_fn tape_34xx_mtop[TAPE_NR_MTOPS] = {
1258         [MTRESET]        = tape_std_mtreset,
1259         [MTFSF]          = tape_std_mtfsf,
1260         [MTBSF]          = tape_std_mtbsf,
1261         [MTFSR]          = tape_std_mtfsr,
1262         [MTBSR]          = tape_std_mtbsr,
1263         [MTWEOF]         = tape_std_mtweof,
1264         [MTREW]          = tape_std_mtrew,
1265         [MTOFFL]         = tape_std_mtoffl,
1266         [MTNOP]          = tape_std_mtnop,
1267         [MTRETEN]        = tape_std_mtreten,
1268         [MTBSFM]         = tape_std_mtbsfm,
1269         [MTFSFM]         = tape_std_mtfsfm,
1270         [MTEOM]          = tape_std_mteom,
1271         [MTERASE]        = tape_std_mterase,
1272         [MTRAS1]         = NULL,
1273         [MTRAS2]         = NULL,
1274         [MTRAS3]         = NULL,
1275         [MTSETBLK]       = tape_std_mtsetblk,
1276         [MTSETDENSITY]   = NULL,
1277         [MTSEEK]         = tape_34xx_mtseek,
1278         [MTTELL]         = tape_34xx_mttell,
1279         [MTSETDRVBUFFER] = NULL,
1280         [MTFSS]          = NULL,
1281         [MTBSS]          = NULL,
1282         [MTWSM]          = NULL,
1283         [MTLOCK]         = NULL,
1284         [MTUNLOCK]       = NULL,
1285         [MTLOAD]         = tape_std_mtload,
1286         [MTUNLOAD]       = tape_std_mtunload,
1287         [MTCOMPRESSION]  = tape_std_mtcompression,
1288         [MTSETPART]      = NULL,
1289         [MTMKPART]       = NULL
1290 };
1291
1292 /*
1293  * Tape discipline structure for 3480 and 3490.
1294  */
1295 static struct tape_discipline tape_discipline_34xx = {
1296         .owner = THIS_MODULE,
1297         .setup_device = tape_34xx_setup_device,
1298         .cleanup_device = tape_34xx_cleanup_device,
1299         .process_eov = tape_std_process_eov,
1300         .irq = tape_34xx_irq,
1301         .read_block = tape_std_read_block,
1302         .write_block = tape_std_write_block,
1303 #ifdef CONFIG_S390_TAPE_BLOCK
1304         .bread = tape_34xx_bread,
1305         .free_bread = tape_34xx_free_bread,
1306         .check_locate = tape_34xx_check_locate,
1307 #endif
1308         .ioctl_fn = tape_34xx_ioctl,
1309         .mtop_array = tape_34xx_mtop
1310 };
1311
1312 static struct ccw_device_id tape_34xx_ids[] = {
1313         { CCW_DEVICE_DEVTYPE(0x3480, 0, 0x3480, 0), driver_info: tape_3480},
1314         { CCW_DEVICE_DEVTYPE(0x3490, 0, 0x3490, 0), driver_info: tape_3490},
1315         { /* end of list */ }
1316 };
1317
1318 static int
1319 tape_34xx_online(struct ccw_device *cdev)
1320 {
1321         return tape_generic_online(
1322                 cdev->dev.driver_data,
1323                 &tape_discipline_34xx
1324         );
1325 }
1326
1327 static int
1328 tape_34xx_offline(struct ccw_device *cdev)
1329 {
1330         return tape_generic_offline(cdev->dev.driver_data);
1331 }
1332
1333 static struct ccw_driver tape_34xx_driver = {
1334         .name = "tape_34xx",
1335         .owner = THIS_MODULE,
1336         .ids = tape_34xx_ids,
1337         .probe = tape_generic_probe,
1338         .remove = tape_generic_remove,
1339         .set_online = tape_34xx_online,
1340         .set_offline = tape_34xx_offline,
1341 };
1342
1343 static int
1344 tape_34xx_init (void)
1345 {
1346         int rc;
1347
1348         TAPE_DBF_AREA = debug_register ( "tape_34xx", 2, 2, 4*sizeof(long));
1349         debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1350 #ifdef DBF_LIKE_HELL
1351         debug_set_level(TAPE_DBF_AREA, 6);
1352 #endif
1353
1354         DBF_EVENT(3, "34xx init\n");
1355         /* Register driver for 3480/3490 tapes. */
1356         rc = ccw_driver_register(&tape_34xx_driver);
1357         if (rc)
1358                 DBF_EVENT(3, "34xx init failed\n");
1359         else
1360                 DBF_EVENT(3, "34xx registered\n");
1361         return rc;
1362 }
1363
1364 static void
1365 tape_34xx_exit(void)
1366 {
1367         ccw_driver_unregister(&tape_34xx_driver);
1368
1369         debug_unregister(TAPE_DBF_AREA);
1370 }
1371
1372 MODULE_DEVICE_TABLE(ccw, tape_34xx_ids);
1373 MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH");
1374 MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape device driver");
1375 MODULE_LICENSE("GPL");
1376
1377 module_init(tape_34xx_init);
1378 module_exit(tape_34xx_exit);