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1da177e4 LT |
1 | /* |
2 | * drivers/s390/char/tape_std.c | |
3 | * standard tape device functions for ibm tapes. | |
4 | * | |
5 | * S390 and zSeries version | |
6 | * Copyright (C) 2001,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
7 | * Author(s): Carsten Otte <cotte@de.ibm.com> | |
8 | * Michael Holzheu <holzheu@de.ibm.com> | |
9 | * Tuan Ngo-Anh <ngoanh@de.ibm.com> | |
10 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
11 | * Stefan Bader <shbader@de.ibm.com> | |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/stddef.h> |
15 | #include <linux/kernel.h> | |
16 | #include <linux/bio.h> | |
17 | #include <linux/timer.h> | |
18 | ||
19 | #include <asm/types.h> | |
20 | #include <asm/idals.h> | |
21 | #include <asm/ebcdic.h> | |
22 | #include <asm/tape390.h> | |
23 | ||
24 | #define TAPE_DBF_AREA tape_core_dbf | |
25 | ||
26 | #include "tape.h" | |
27 | #include "tape_std.h" | |
28 | ||
29 | #define PRINTK_HEADER "TAPE_STD: " | |
30 | ||
31 | /* | |
32 | * tape_std_assign | |
33 | */ | |
34 | static void | |
35 | tape_std_assign_timeout(unsigned long data) | |
36 | { | |
37 | struct tape_request * request; | |
38 | struct tape_device * device; | |
5f384338 | 39 | int rc; |
1da177e4 LT |
40 | |
41 | request = (struct tape_request *) data; | |
42 | if ((device = request->device) == NULL) | |
43 | BUG(); | |
44 | ||
5f384338 | 45 | DBF_EVENT(3, "%08x: Assignment timeout. Device busy.\n", |
1da177e4 | 46 | device->cdev_id); |
5f384338 MH |
47 | rc = tape_cancel_io(device, request); |
48 | if(rc) | |
49 | PRINT_ERR("(%s): Assign timeout: Cancel failed with rc = %i\n", | |
50 | device->cdev->dev.bus_id, rc); | |
51 | ||
1da177e4 LT |
52 | } |
53 | ||
54 | int | |
55 | tape_std_assign(struct tape_device *device) | |
56 | { | |
57 | int rc; | |
58 | struct timer_list timeout; | |
59 | struct tape_request *request; | |
60 | ||
61 | request = tape_alloc_request(2, 11); | |
62 | if (IS_ERR(request)) | |
63 | return PTR_ERR(request); | |
64 | ||
65 | request->op = TO_ASSIGN; | |
66 | tape_ccw_cc(request->cpaddr, ASSIGN, 11, request->cpdata); | |
67 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
68 | ||
69 | /* | |
70 | * The assign command sometimes blocks if the device is assigned | |
71 | * to another host (actually this shouldn't happen but it does). | |
72 | * So we set up a timeout for this call. | |
73 | */ | |
74 | init_timer(&timeout); | |
75 | timeout.function = tape_std_assign_timeout; | |
76 | timeout.data = (unsigned long) request; | |
77 | timeout.expires = jiffies + 2 * HZ; | |
78 | add_timer(&timeout); | |
79 | ||
80 | rc = tape_do_io_interruptible(device, request); | |
81 | ||
82 | del_timer(&timeout); | |
83 | ||
84 | if (rc != 0) { | |
85 | PRINT_WARN("%s: assign failed - device might be busy\n", | |
86 | device->cdev->dev.bus_id); | |
87 | DBF_EVENT(3, "%08x: assign failed - device might be busy\n", | |
88 | device->cdev_id); | |
89 | } else { | |
90 | DBF_EVENT(3, "%08x: Tape assigned\n", device->cdev_id); | |
91 | } | |
92 | tape_free_request(request); | |
93 | return rc; | |
94 | } | |
95 | ||
96 | /* | |
97 | * tape_std_unassign | |
98 | */ | |
99 | int | |
100 | tape_std_unassign (struct tape_device *device) | |
101 | { | |
102 | int rc; | |
103 | struct tape_request *request; | |
104 | ||
105 | if (device->tape_state == TS_NOT_OPER) { | |
106 | DBF_EVENT(3, "(%08x): Can't unassign device\n", | |
107 | device->cdev_id); | |
108 | PRINT_WARN("(%s): Can't unassign device - device gone\n", | |
109 | device->cdev->dev.bus_id); | |
110 | return -EIO; | |
111 | } | |
112 | ||
113 | request = tape_alloc_request(2, 11); | |
114 | if (IS_ERR(request)) | |
115 | return PTR_ERR(request); | |
116 | ||
117 | request->op = TO_UNASSIGN; | |
118 | tape_ccw_cc(request->cpaddr, UNASSIGN, 11, request->cpdata); | |
119 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
120 | ||
121 | if ((rc = tape_do_io(device, request)) != 0) { | |
122 | DBF_EVENT(3, "%08x: Unassign failed\n", device->cdev_id); | |
123 | PRINT_WARN("%s: Unassign failed\n", device->cdev->dev.bus_id); | |
124 | } else { | |
125 | DBF_EVENT(3, "%08x: Tape unassigned\n", device->cdev_id); | |
126 | } | |
127 | tape_free_request(request); | |
128 | return rc; | |
129 | } | |
130 | ||
131 | /* | |
132 | * TAPE390_DISPLAY: Show a string on the tape display. | |
133 | */ | |
134 | int | |
135 | tape_std_display(struct tape_device *device, struct display_struct *disp) | |
136 | { | |
137 | struct tape_request *request; | |
138 | int rc; | |
139 | ||
140 | request = tape_alloc_request(2, 17); | |
141 | if (IS_ERR(request)) { | |
142 | DBF_EVENT(3, "TAPE: load display failed\n"); | |
143 | return PTR_ERR(request); | |
144 | } | |
145 | request->op = TO_DIS; | |
146 | ||
147 | *(unsigned char *) request->cpdata = disp->cntrl; | |
148 | DBF_EVENT(5, "TAPE: display cntrl=%04x\n", disp->cntrl); | |
149 | memcpy(((unsigned char *) request->cpdata) + 1, disp->message1, 8); | |
150 | memcpy(((unsigned char *) request->cpdata) + 9, disp->message2, 8); | |
151 | ASCEBC(((unsigned char*) request->cpdata) + 1, 16); | |
152 | ||
153 | tape_ccw_cc(request->cpaddr, LOAD_DISPLAY, 17, request->cpdata); | |
154 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
155 | ||
156 | rc = tape_do_io_interruptible(device, request); | |
157 | tape_free_request(request); | |
158 | return rc; | |
159 | } | |
160 | ||
161 | /* | |
162 | * Read block id. | |
163 | */ | |
164 | int | |
165 | tape_std_read_block_id(struct tape_device *device, __u64 *id) | |
166 | { | |
167 | struct tape_request *request; | |
168 | int rc; | |
169 | ||
170 | request = tape_alloc_request(3, 8); | |
171 | if (IS_ERR(request)) | |
172 | return PTR_ERR(request); | |
173 | request->op = TO_RBI; | |
174 | /* setup ccws */ | |
175 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
176 | tape_ccw_cc(request->cpaddr + 1, READ_BLOCK_ID, 8, request->cpdata); | |
177 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
178 | /* execute it */ | |
179 | rc = tape_do_io(device, request); | |
180 | if (rc == 0) | |
181 | /* Get result from read buffer. */ | |
182 | *id = *(__u64 *) request->cpdata; | |
183 | tape_free_request(request); | |
184 | return rc; | |
185 | } | |
186 | ||
187 | int | |
188 | tape_std_terminate_write(struct tape_device *device) | |
189 | { | |
190 | int rc; | |
191 | ||
192 | if(device->required_tapemarks == 0) | |
193 | return 0; | |
194 | ||
195 | DBF_LH(5, "tape%d: terminate write %dxEOF\n", device->first_minor, | |
196 | device->required_tapemarks); | |
197 | ||
198 | rc = tape_mtop(device, MTWEOF, device->required_tapemarks); | |
199 | if (rc) | |
200 | return rc; | |
201 | ||
202 | device->required_tapemarks = 0; | |
203 | return tape_mtop(device, MTBSR, 1); | |
204 | } | |
205 | ||
206 | /* | |
207 | * MTLOAD: Loads the tape. | |
208 | * The default implementation just wait until the tape medium state changes | |
209 | * to MS_LOADED. | |
210 | */ | |
211 | int | |
212 | tape_std_mtload(struct tape_device *device, int count) | |
213 | { | |
214 | return wait_event_interruptible(device->state_change_wq, | |
215 | (device->medium_state == MS_LOADED)); | |
216 | } | |
217 | ||
218 | /* | |
219 | * MTSETBLK: Set block size. | |
220 | */ | |
221 | int | |
222 | tape_std_mtsetblk(struct tape_device *device, int count) | |
223 | { | |
224 | struct idal_buffer *new; | |
225 | ||
226 | DBF_LH(6, "tape_std_mtsetblk(%d)\n", count); | |
227 | if (count <= 0) { | |
228 | /* | |
229 | * Just set block_size to 0. tapechar_read/tapechar_write | |
230 | * will realloc the idal buffer if a bigger one than the | |
231 | * current is needed. | |
232 | */ | |
233 | device->char_data.block_size = 0; | |
234 | return 0; | |
235 | } | |
236 | if (device->char_data.idal_buf != NULL && | |
237 | device->char_data.idal_buf->size == count) | |
238 | /* We already have a idal buffer of that size. */ | |
239 | return 0; | |
240 | ||
241 | if (count > MAX_BLOCKSIZE) { | |
242 | DBF_EVENT(3, "Invalid block size (%d > %d) given.\n", | |
243 | count, MAX_BLOCKSIZE); | |
244 | PRINT_ERR("Invalid block size (%d > %d) given.\n", | |
245 | count, MAX_BLOCKSIZE); | |
246 | return -EINVAL; | |
247 | } | |
248 | ||
249 | /* Allocate a new idal buffer. */ | |
250 | new = idal_buffer_alloc(count, 0); | |
251 | if (new == NULL) | |
252 | return -ENOMEM; | |
253 | if (device->char_data.idal_buf != NULL) | |
254 | idal_buffer_free(device->char_data.idal_buf); | |
255 | device->char_data.idal_buf = new; | |
256 | device->char_data.block_size = count; | |
257 | ||
258 | DBF_LH(6, "new blocksize is %d\n", device->char_data.block_size); | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | /* | |
264 | * MTRESET: Set block size to 0. | |
265 | */ | |
266 | int | |
267 | tape_std_mtreset(struct tape_device *device, int count) | |
268 | { | |
269 | DBF_EVENT(6, "TCHAR:devreset:\n"); | |
270 | device->char_data.block_size = 0; | |
271 | return 0; | |
272 | } | |
273 | ||
274 | /* | |
275 | * MTFSF: Forward space over 'count' file marks. The tape is positioned | |
276 | * at the EOT (End of Tape) side of the file mark. | |
277 | */ | |
278 | int | |
279 | tape_std_mtfsf(struct tape_device *device, int mt_count) | |
280 | { | |
281 | struct tape_request *request; | |
282 | struct ccw1 *ccw; | |
283 | ||
284 | request = tape_alloc_request(mt_count + 2, 0); | |
285 | if (IS_ERR(request)) | |
286 | return PTR_ERR(request); | |
287 | request->op = TO_FSF; | |
288 | /* setup ccws */ | |
289 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
290 | device->modeset_byte); | |
291 | ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); | |
292 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
293 | ||
294 | /* execute it */ | |
295 | return tape_do_io_free(device, request); | |
296 | } | |
297 | ||
298 | /* | |
299 | * MTFSR: Forward space over 'count' tape blocks (blocksize is set | |
300 | * via MTSETBLK. | |
301 | */ | |
302 | int | |
303 | tape_std_mtfsr(struct tape_device *device, int mt_count) | |
304 | { | |
305 | struct tape_request *request; | |
306 | struct ccw1 *ccw; | |
307 | int rc; | |
308 | ||
309 | request = tape_alloc_request(mt_count + 2, 0); | |
310 | if (IS_ERR(request)) | |
311 | return PTR_ERR(request); | |
312 | request->op = TO_FSB; | |
313 | /* setup ccws */ | |
314 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
315 | device->modeset_byte); | |
316 | ccw = tape_ccw_repeat(ccw, FORSPACEBLOCK, mt_count); | |
317 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
318 | ||
319 | /* execute it */ | |
320 | rc = tape_do_io(device, request); | |
321 | if (rc == 0 && request->rescnt > 0) { | |
322 | DBF_LH(3, "FSR over tapemark\n"); | |
323 | rc = 1; | |
324 | } | |
325 | tape_free_request(request); | |
326 | ||
327 | return rc; | |
328 | } | |
329 | ||
330 | /* | |
331 | * MTBSR: Backward space over 'count' tape blocks. | |
332 | * (blocksize is set via MTSETBLK. | |
333 | */ | |
334 | int | |
335 | tape_std_mtbsr(struct tape_device *device, int mt_count) | |
336 | { | |
337 | struct tape_request *request; | |
338 | struct ccw1 *ccw; | |
339 | int rc; | |
340 | ||
341 | request = tape_alloc_request(mt_count + 2, 0); | |
342 | if (IS_ERR(request)) | |
343 | return PTR_ERR(request); | |
344 | request->op = TO_BSB; | |
345 | /* setup ccws */ | |
346 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
347 | device->modeset_byte); | |
348 | ccw = tape_ccw_repeat(ccw, BACKSPACEBLOCK, mt_count); | |
349 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
350 | ||
351 | /* execute it */ | |
352 | rc = tape_do_io(device, request); | |
353 | if (rc == 0 && request->rescnt > 0) { | |
354 | DBF_LH(3, "BSR over tapemark\n"); | |
355 | rc = 1; | |
356 | } | |
357 | tape_free_request(request); | |
358 | ||
359 | return rc; | |
360 | } | |
361 | ||
362 | /* | |
363 | * MTWEOF: Write 'count' file marks at the current position. | |
364 | */ | |
365 | int | |
366 | tape_std_mtweof(struct tape_device *device, int mt_count) | |
367 | { | |
368 | struct tape_request *request; | |
369 | struct ccw1 *ccw; | |
370 | ||
371 | request = tape_alloc_request(mt_count + 2, 0); | |
372 | if (IS_ERR(request)) | |
373 | return PTR_ERR(request); | |
374 | request->op = TO_WTM; | |
375 | /* setup ccws */ | |
376 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
377 | device->modeset_byte); | |
378 | ccw = tape_ccw_repeat(ccw, WRITETAPEMARK, mt_count); | |
379 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
380 | ||
381 | /* execute it */ | |
382 | return tape_do_io_free(device, request); | |
383 | } | |
384 | ||
385 | /* | |
386 | * MTBSFM: Backward space over 'count' file marks. | |
387 | * The tape is positioned at the BOT (Begin Of Tape) side of the | |
388 | * last skipped file mark. | |
389 | */ | |
390 | int | |
391 | tape_std_mtbsfm(struct tape_device *device, int mt_count) | |
392 | { | |
393 | struct tape_request *request; | |
394 | struct ccw1 *ccw; | |
395 | ||
396 | request = tape_alloc_request(mt_count + 2, 0); | |
397 | if (IS_ERR(request)) | |
398 | return PTR_ERR(request); | |
399 | request->op = TO_BSF; | |
400 | /* setup ccws */ | |
401 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
402 | device->modeset_byte); | |
403 | ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); | |
404 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
405 | ||
406 | /* execute it */ | |
407 | return tape_do_io_free(device, request); | |
408 | } | |
409 | ||
410 | /* | |
411 | * MTBSF: Backward space over 'count' file marks. The tape is positioned at | |
412 | * the EOT (End of Tape) side of the last skipped file mark. | |
413 | */ | |
414 | int | |
415 | tape_std_mtbsf(struct tape_device *device, int mt_count) | |
416 | { | |
417 | struct tape_request *request; | |
418 | struct ccw1 *ccw; | |
419 | int rc; | |
420 | ||
421 | request = tape_alloc_request(mt_count + 2, 0); | |
422 | if (IS_ERR(request)) | |
423 | return PTR_ERR(request); | |
424 | request->op = TO_BSF; | |
425 | /* setup ccws */ | |
426 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
427 | device->modeset_byte); | |
428 | ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); | |
429 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
430 | /* execute it */ | |
431 | rc = tape_do_io_free(device, request); | |
432 | if (rc == 0) { | |
433 | rc = tape_mtop(device, MTFSR, 1); | |
434 | if (rc > 0) | |
435 | rc = 0; | |
436 | } | |
437 | return rc; | |
438 | } | |
439 | ||
440 | /* | |
441 | * MTFSFM: Forward space over 'count' file marks. | |
442 | * The tape is positioned at the BOT (Begin Of Tape) side | |
443 | * of the last skipped file mark. | |
444 | */ | |
445 | int | |
446 | tape_std_mtfsfm(struct tape_device *device, int mt_count) | |
447 | { | |
448 | struct tape_request *request; | |
449 | struct ccw1 *ccw; | |
450 | int rc; | |
451 | ||
452 | request = tape_alloc_request(mt_count + 2, 0); | |
453 | if (IS_ERR(request)) | |
454 | return PTR_ERR(request); | |
455 | request->op = TO_FSF; | |
456 | /* setup ccws */ | |
457 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
458 | device->modeset_byte); | |
459 | ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); | |
460 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
461 | /* execute it */ | |
462 | rc = tape_do_io_free(device, request); | |
463 | if (rc == 0) { | |
464 | rc = tape_mtop(device, MTBSR, 1); | |
465 | if (rc > 0) | |
466 | rc = 0; | |
467 | } | |
468 | ||
469 | return rc; | |
470 | } | |
471 | ||
472 | /* | |
473 | * MTREW: Rewind the tape. | |
474 | */ | |
475 | int | |
476 | tape_std_mtrew(struct tape_device *device, int mt_count) | |
477 | { | |
478 | struct tape_request *request; | |
479 | ||
480 | request = tape_alloc_request(3, 0); | |
481 | if (IS_ERR(request)) | |
482 | return PTR_ERR(request); | |
483 | request->op = TO_REW; | |
484 | /* setup ccws */ | |
485 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
486 | device->modeset_byte); | |
487 | tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); | |
488 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
489 | ||
490 | /* execute it */ | |
491 | return tape_do_io_free(device, request); | |
492 | } | |
493 | ||
494 | /* | |
495 | * MTOFFL: Rewind the tape and put the drive off-line. | |
496 | * Implement 'rewind unload' | |
497 | */ | |
498 | int | |
499 | tape_std_mtoffl(struct tape_device *device, int mt_count) | |
500 | { | |
501 | struct tape_request *request; | |
502 | ||
503 | request = tape_alloc_request(3, 0); | |
504 | if (IS_ERR(request)) | |
505 | return PTR_ERR(request); | |
506 | request->op = TO_RUN; | |
507 | /* setup ccws */ | |
508 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
509 | tape_ccw_cc(request->cpaddr + 1, REWIND_UNLOAD, 0, NULL); | |
510 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
511 | ||
512 | /* execute it */ | |
513 | return tape_do_io_free(device, request); | |
514 | } | |
515 | ||
516 | /* | |
517 | * MTNOP: 'No operation'. | |
518 | */ | |
519 | int | |
520 | tape_std_mtnop(struct tape_device *device, int mt_count) | |
521 | { | |
522 | struct tape_request *request; | |
523 | ||
524 | request = tape_alloc_request(2, 0); | |
525 | if (IS_ERR(request)) | |
526 | return PTR_ERR(request); | |
527 | request->op = TO_NOP; | |
528 | /* setup ccws */ | |
529 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
530 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
531 | /* execute it */ | |
532 | return tape_do_io_free(device, request); | |
533 | } | |
534 | ||
535 | /* | |
536 | * MTEOM: positions at the end of the portion of the tape already used | |
537 | * for recordind data. MTEOM positions after the last file mark, ready for | |
538 | * appending another file. | |
539 | */ | |
540 | int | |
541 | tape_std_mteom(struct tape_device *device, int mt_count) | |
542 | { | |
543 | int rc; | |
544 | ||
545 | /* | |
546 | * Seek from the beginning of tape (rewind). | |
547 | */ | |
548 | if ((rc = tape_mtop(device, MTREW, 1)) < 0) | |
549 | return rc; | |
550 | ||
551 | /* | |
552 | * The logical end of volume is given by two sewuential tapemarks. | |
553 | * Look for this by skipping to the next file (over one tapemark) | |
554 | * and then test for another one (fsr returns 1 if a tapemark was | |
555 | * encountered). | |
556 | */ | |
557 | do { | |
558 | if ((rc = tape_mtop(device, MTFSF, 1)) < 0) | |
559 | return rc; | |
560 | if ((rc = tape_mtop(device, MTFSR, 1)) < 0) | |
561 | return rc; | |
562 | } while (rc == 0); | |
563 | ||
564 | return tape_mtop(device, MTBSR, 1); | |
565 | } | |
566 | ||
567 | /* | |
568 | * MTRETEN: Retension the tape, i.e. forward space to end of tape and rewind. | |
569 | */ | |
570 | int | |
571 | tape_std_mtreten(struct tape_device *device, int mt_count) | |
572 | { | |
573 | struct tape_request *request; | |
574 | int rc; | |
575 | ||
576 | request = tape_alloc_request(4, 0); | |
577 | if (IS_ERR(request)) | |
578 | return PTR_ERR(request); | |
579 | request->op = TO_FSF; | |
580 | /* setup ccws */ | |
581 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
582 | tape_ccw_cc(request->cpaddr + 1,FORSPACEFILE, 0, NULL); | |
583 | tape_ccw_cc(request->cpaddr + 2, NOP, 0, NULL); | |
584 | tape_ccw_end(request->cpaddr + 3, CCW_CMD_TIC, 0, request->cpaddr); | |
585 | /* execute it, MTRETEN rc gets ignored */ | |
586 | rc = tape_do_io_interruptible(device, request); | |
587 | tape_free_request(request); | |
588 | return tape_mtop(device, MTREW, 1); | |
589 | } | |
590 | ||
591 | /* | |
592 | * MTERASE: erases the tape. | |
593 | */ | |
594 | int | |
595 | tape_std_mterase(struct tape_device *device, int mt_count) | |
596 | { | |
597 | struct tape_request *request; | |
598 | ||
599 | request = tape_alloc_request(6, 0); | |
600 | if (IS_ERR(request)) | |
601 | return PTR_ERR(request); | |
602 | request->op = TO_DSE; | |
603 | /* setup ccws */ | |
604 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
605 | tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); | |
606 | tape_ccw_cc(request->cpaddr + 2, ERASE_GAP, 0, NULL); | |
607 | tape_ccw_cc(request->cpaddr + 3, DATA_SEC_ERASE, 0, NULL); | |
608 | tape_ccw_cc(request->cpaddr + 4, REWIND, 0, NULL); | |
609 | tape_ccw_end(request->cpaddr + 5, NOP, 0, NULL); | |
610 | ||
611 | /* execute it */ | |
612 | return tape_do_io_free(device, request); | |
613 | } | |
614 | ||
615 | /* | |
616 | * MTUNLOAD: Rewind the tape and unload it. | |
617 | */ | |
618 | int | |
619 | tape_std_mtunload(struct tape_device *device, int mt_count) | |
620 | { | |
621 | return tape_mtop(device, MTOFFL, mt_count); | |
622 | } | |
623 | ||
624 | /* | |
625 | * MTCOMPRESSION: used to enable compression. | |
626 | * Sets the IDRC on/off. | |
627 | */ | |
628 | int | |
629 | tape_std_mtcompression(struct tape_device *device, int mt_count) | |
630 | { | |
631 | struct tape_request *request; | |
632 | ||
633 | if (mt_count < 0 || mt_count > 1) { | |
634 | DBF_EXCEPTION(6, "xcom parm\n"); | |
635 | if (*device->modeset_byte & 0x08) | |
636 | PRINT_INFO("(%s) Compression is currently on\n", | |
637 | device->cdev->dev.bus_id); | |
638 | else | |
639 | PRINT_INFO("(%s) Compression is currently off\n", | |
640 | device->cdev->dev.bus_id); | |
641 | PRINT_INFO("Use 1 to switch compression on, 0 to " | |
642 | "switch it off\n"); | |
643 | return -EINVAL; | |
644 | } | |
645 | request = tape_alloc_request(2, 0); | |
646 | if (IS_ERR(request)) | |
647 | return PTR_ERR(request); | |
648 | request->op = TO_NOP; | |
649 | /* setup ccws */ | |
4925c7e2 MH |
650 | if (mt_count == 0) |
651 | *device->modeset_byte &= ~0x08; | |
652 | else | |
653 | *device->modeset_byte |= 0x08; | |
1da177e4 LT |
654 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
655 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
656 | /* execute it */ | |
657 | return tape_do_io_free(device, request); | |
658 | } | |
659 | ||
660 | /* | |
661 | * Read Block | |
662 | */ | |
663 | struct tape_request * | |
664 | tape_std_read_block(struct tape_device *device, size_t count) | |
665 | { | |
666 | struct tape_request *request; | |
667 | ||
668 | /* | |
669 | * We have to alloc 4 ccws in order to be able to transform request | |
670 | * into a read backward request in error case. | |
671 | */ | |
672 | request = tape_alloc_request(4, 0); | |
673 | if (IS_ERR(request)) { | |
674 | DBF_EXCEPTION(6, "xrbl fail"); | |
675 | return request; | |
676 | } | |
677 | request->op = TO_RFO; | |
678 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
679 | tape_ccw_end_idal(request->cpaddr + 1, READ_FORWARD, | |
680 | device->char_data.idal_buf); | |
681 | DBF_EVENT(6, "xrbl ccwg\n"); | |
682 | return request; | |
683 | } | |
684 | ||
685 | /* | |
686 | * Read Block backward transformation function. | |
687 | */ | |
688 | void | |
689 | tape_std_read_backward(struct tape_device *device, struct tape_request *request) | |
690 | { | |
691 | /* | |
692 | * We have allocated 4 ccws in tape_std_read, so we can now | |
693 | * transform the request to a read backward, followed by a | |
694 | * forward space block. | |
695 | */ | |
696 | request->op = TO_RBA; | |
697 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
698 | tape_ccw_cc_idal(request->cpaddr + 1, READ_BACKWARD, | |
699 | device->char_data.idal_buf); | |
700 | tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL); | |
701 | tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL); | |
702 | DBF_EVENT(6, "xrop ccwg");} | |
703 | ||
704 | /* | |
705 | * Write Block | |
706 | */ | |
707 | struct tape_request * | |
708 | tape_std_write_block(struct tape_device *device, size_t count) | |
709 | { | |
710 | struct tape_request *request; | |
711 | ||
712 | request = tape_alloc_request(2, 0); | |
713 | if (IS_ERR(request)) { | |
714 | DBF_EXCEPTION(6, "xwbl fail\n"); | |
715 | return request; | |
716 | } | |
717 | request->op = TO_WRI; | |
718 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
719 | tape_ccw_end_idal(request->cpaddr + 1, WRITE_CMD, | |
720 | device->char_data.idal_buf); | |
721 | DBF_EVENT(6, "xwbl ccwg\n"); | |
722 | return request; | |
723 | } | |
724 | ||
725 | /* | |
726 | * This routine is called by frontend after an ENOSP on write | |
727 | */ | |
728 | void | |
729 | tape_std_process_eov(struct tape_device *device) | |
730 | { | |
731 | /* | |
732 | * End of volume: We have to backspace the last written record, then | |
733 | * we TRY to write a tapemark and then backspace over the written TM | |
734 | */ | |
735 | if (tape_mtop(device, MTBSR, 1) == 0 && | |
736 | tape_mtop(device, MTWEOF, 1) == 0) { | |
737 | tape_mtop(device, MTBSR, 1); | |
738 | } | |
739 | } | |
740 | ||
741 | EXPORT_SYMBOL(tape_std_assign); | |
742 | EXPORT_SYMBOL(tape_std_unassign); | |
743 | EXPORT_SYMBOL(tape_std_display); | |
744 | EXPORT_SYMBOL(tape_std_read_block_id); | |
745 | EXPORT_SYMBOL(tape_std_mtload); | |
746 | EXPORT_SYMBOL(tape_std_mtsetblk); | |
747 | EXPORT_SYMBOL(tape_std_mtreset); | |
748 | EXPORT_SYMBOL(tape_std_mtfsf); | |
749 | EXPORT_SYMBOL(tape_std_mtfsr); | |
750 | EXPORT_SYMBOL(tape_std_mtbsr); | |
751 | EXPORT_SYMBOL(tape_std_mtweof); | |
752 | EXPORT_SYMBOL(tape_std_mtbsfm); | |
753 | EXPORT_SYMBOL(tape_std_mtbsf); | |
754 | EXPORT_SYMBOL(tape_std_mtfsfm); | |
755 | EXPORT_SYMBOL(tape_std_mtrew); | |
756 | EXPORT_SYMBOL(tape_std_mtoffl); | |
757 | EXPORT_SYMBOL(tape_std_mtnop); | |
758 | EXPORT_SYMBOL(tape_std_mteom); | |
759 | EXPORT_SYMBOL(tape_std_mtreten); | |
760 | EXPORT_SYMBOL(tape_std_mterase); | |
761 | EXPORT_SYMBOL(tape_std_mtunload); | |
762 | EXPORT_SYMBOL(tape_std_mtcompression); | |
763 | EXPORT_SYMBOL(tape_std_read_block); | |
764 | EXPORT_SYMBOL(tape_std_read_backward); | |
765 | EXPORT_SYMBOL(tape_std_write_block); | |
766 | EXPORT_SYMBOL(tape_std_process_eov); |