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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * MTD device concatenation layer | |
3 | * | |
4 | * (C) 2002 Robert Kaiser <rkaiser@sysgo.de> | |
5 | * | |
6 | * NAND support by Christian Gan <cgan@iders.ca> | |
7 | * | |
8 | * This code is GPL | |
9 | * | |
10 | * $Id: mtdconcat.c,v 1.9 2004/06/30 15:17:41 dbrown Exp $ | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/slab.h> | |
4e57b681 | 17 | #include <linux/sched.h> /* TASK_* */ |
1da177e4 LT |
18 | #include <linux/mtd/mtd.h> |
19 | #include <linux/mtd/concat.h> | |
20 | ||
21 | /* | |
22 | * Our storage structure: | |
23 | * Subdev points to an array of pointers to struct mtd_info objects | |
24 | * which is allocated along with this structure | |
25 | * | |
26 | */ | |
27 | struct mtd_concat { | |
28 | struct mtd_info mtd; | |
29 | int num_subdev; | |
30 | struct mtd_info **subdev; | |
31 | }; | |
32 | ||
33 | /* | |
34 | * how to calculate the size required for the above structure, | |
35 | * including the pointer array subdev points to: | |
36 | */ | |
37 | #define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \ | |
38 | ((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *))) | |
39 | ||
40 | /* | |
41 | * Given a pointer to the MTD object in the mtd_concat structure, | |
42 | * we can retrieve the pointer to that structure with this macro. | |
43 | */ | |
44 | #define CONCAT(x) ((struct mtd_concat *)(x)) | |
45 | ||
46 | /* | |
47 | * MTD methods which look up the relevant subdevice, translate the | |
48 | * effective address and pass through to the subdevice. | |
49 | */ | |
50 | ||
51 | static int | |
52 | concat_read(struct mtd_info *mtd, loff_t from, size_t len, | |
53 | size_t * retlen, u_char * buf) | |
54 | { | |
55 | struct mtd_concat *concat = CONCAT(mtd); | |
56 | int err = -EINVAL; | |
57 | int i; | |
58 | ||
59 | *retlen = 0; | |
60 | ||
61 | for (i = 0; i < concat->num_subdev; i++) { | |
62 | struct mtd_info *subdev = concat->subdev[i]; | |
63 | size_t size, retsize; | |
64 | ||
65 | if (from >= subdev->size) { | |
66 | /* Not destined for this subdev */ | |
67 | size = 0; | |
68 | from -= subdev->size; | |
69 | continue; | |
70 | } | |
71 | if (from + len > subdev->size) | |
72 | /* First part goes into this subdev */ | |
73 | size = subdev->size - from; | |
74 | else | |
75 | /* Entire transaction goes into this subdev */ | |
76 | size = len; | |
77 | ||
78 | err = subdev->read(subdev, from, size, &retsize, buf); | |
79 | ||
80 | if (err) | |
81 | break; | |
82 | ||
83 | *retlen += retsize; | |
84 | len -= size; | |
85 | if (len == 0) | |
86 | break; | |
87 | ||
88 | err = -EINVAL; | |
89 | buf += size; | |
90 | from = 0; | |
91 | } | |
92 | return err; | |
93 | } | |
94 | ||
95 | static int | |
96 | concat_write(struct mtd_info *mtd, loff_t to, size_t len, | |
97 | size_t * retlen, const u_char * buf) | |
98 | { | |
99 | struct mtd_concat *concat = CONCAT(mtd); | |
100 | int err = -EINVAL; | |
101 | int i; | |
102 | ||
103 | if (!(mtd->flags & MTD_WRITEABLE)) | |
104 | return -EROFS; | |
105 | ||
106 | *retlen = 0; | |
107 | ||
108 | for (i = 0; i < concat->num_subdev; i++) { | |
109 | struct mtd_info *subdev = concat->subdev[i]; | |
110 | size_t size, retsize; | |
111 | ||
112 | if (to >= subdev->size) { | |
113 | size = 0; | |
114 | to -= subdev->size; | |
115 | continue; | |
116 | } | |
117 | if (to + len > subdev->size) | |
118 | size = subdev->size - to; | |
119 | else | |
120 | size = len; | |
121 | ||
122 | if (!(subdev->flags & MTD_WRITEABLE)) | |
123 | err = -EROFS; | |
124 | else | |
125 | err = subdev->write(subdev, to, size, &retsize, buf); | |
126 | ||
127 | if (err) | |
128 | break; | |
129 | ||
130 | *retlen += retsize; | |
131 | len -= size; | |
132 | if (len == 0) | |
133 | break; | |
134 | ||
135 | err = -EINVAL; | |
136 | buf += size; | |
137 | to = 0; | |
138 | } | |
139 | return err; | |
140 | } | |
141 | ||
142 | static int | |
143 | concat_read_ecc(struct mtd_info *mtd, loff_t from, size_t len, | |
144 | size_t * retlen, u_char * buf, u_char * eccbuf, | |
145 | struct nand_oobinfo *oobsel) | |
146 | { | |
147 | struct mtd_concat *concat = CONCAT(mtd); | |
148 | int err = -EINVAL; | |
149 | int i; | |
150 | ||
151 | *retlen = 0; | |
152 | ||
153 | for (i = 0; i < concat->num_subdev; i++) { | |
154 | struct mtd_info *subdev = concat->subdev[i]; | |
155 | size_t size, retsize; | |
156 | ||
157 | if (from >= subdev->size) { | |
158 | /* Not destined for this subdev */ | |
159 | size = 0; | |
160 | from -= subdev->size; | |
161 | continue; | |
162 | } | |
163 | ||
164 | if (from + len > subdev->size) | |
165 | /* First part goes into this subdev */ | |
166 | size = subdev->size - from; | |
167 | else | |
168 | /* Entire transaction goes into this subdev */ | |
169 | size = len; | |
170 | ||
171 | if (subdev->read_ecc) | |
172 | err = subdev->read_ecc(subdev, from, size, | |
173 | &retsize, buf, eccbuf, oobsel); | |
174 | else | |
175 | err = -EINVAL; | |
176 | ||
177 | if (err) | |
178 | break; | |
179 | ||
180 | *retlen += retsize; | |
181 | len -= size; | |
182 | if (len == 0) | |
183 | break; | |
184 | ||
185 | err = -EINVAL; | |
186 | buf += size; | |
187 | if (eccbuf) { | |
188 | eccbuf += subdev->oobsize; | |
189 | /* in nand.c at least, eccbufs are | |
190 | tagged with 2 (int)eccstatus'; we | |
191 | must account for these */ | |
192 | eccbuf += 2 * (sizeof (int)); | |
193 | } | |
194 | from = 0; | |
195 | } | |
196 | return err; | |
197 | } | |
198 | ||
199 | static int | |
200 | concat_write_ecc(struct mtd_info *mtd, loff_t to, size_t len, | |
201 | size_t * retlen, const u_char * buf, u_char * eccbuf, | |
202 | struct nand_oobinfo *oobsel) | |
203 | { | |
204 | struct mtd_concat *concat = CONCAT(mtd); | |
205 | int err = -EINVAL; | |
206 | int i; | |
207 | ||
208 | if (!(mtd->flags & MTD_WRITEABLE)) | |
209 | return -EROFS; | |
210 | ||
211 | *retlen = 0; | |
212 | ||
213 | for (i = 0; i < concat->num_subdev; i++) { | |
214 | struct mtd_info *subdev = concat->subdev[i]; | |
215 | size_t size, retsize; | |
216 | ||
217 | if (to >= subdev->size) { | |
218 | size = 0; | |
219 | to -= subdev->size; | |
220 | continue; | |
221 | } | |
222 | if (to + len > subdev->size) | |
223 | size = subdev->size - to; | |
224 | else | |
225 | size = len; | |
226 | ||
227 | if (!(subdev->flags & MTD_WRITEABLE)) | |
228 | err = -EROFS; | |
229 | else if (subdev->write_ecc) | |
230 | err = subdev->write_ecc(subdev, to, size, | |
231 | &retsize, buf, eccbuf, oobsel); | |
232 | else | |
233 | err = -EINVAL; | |
234 | ||
235 | if (err) | |
236 | break; | |
237 | ||
238 | *retlen += retsize; | |
239 | len -= size; | |
240 | if (len == 0) | |
241 | break; | |
242 | ||
243 | err = -EINVAL; | |
244 | buf += size; | |
245 | if (eccbuf) | |
246 | eccbuf += subdev->oobsize; | |
247 | to = 0; | |
248 | } | |
249 | return err; | |
250 | } | |
251 | ||
252 | static int | |
253 | concat_read_oob(struct mtd_info *mtd, loff_t from, size_t len, | |
254 | size_t * retlen, u_char * buf) | |
255 | { | |
256 | struct mtd_concat *concat = CONCAT(mtd); | |
257 | int err = -EINVAL; | |
258 | int i; | |
259 | ||
260 | *retlen = 0; | |
261 | ||
262 | for (i = 0; i < concat->num_subdev; i++) { | |
263 | struct mtd_info *subdev = concat->subdev[i]; | |
264 | size_t size, retsize; | |
265 | ||
266 | if (from >= subdev->size) { | |
267 | /* Not destined for this subdev */ | |
268 | size = 0; | |
269 | from -= subdev->size; | |
270 | continue; | |
271 | } | |
272 | if (from + len > subdev->size) | |
273 | /* First part goes into this subdev */ | |
274 | size = subdev->size - from; | |
275 | else | |
276 | /* Entire transaction goes into this subdev */ | |
277 | size = len; | |
278 | ||
279 | if (subdev->read_oob) | |
280 | err = subdev->read_oob(subdev, from, size, | |
281 | &retsize, buf); | |
282 | else | |
283 | err = -EINVAL; | |
284 | ||
285 | if (err) | |
286 | break; | |
287 | ||
288 | *retlen += retsize; | |
289 | len -= size; | |
290 | if (len == 0) | |
291 | break; | |
292 | ||
293 | err = -EINVAL; | |
294 | buf += size; | |
295 | from = 0; | |
296 | } | |
297 | return err; | |
298 | } | |
299 | ||
300 | static int | |
301 | concat_write_oob(struct mtd_info *mtd, loff_t to, size_t len, | |
302 | size_t * retlen, const u_char * buf) | |
303 | { | |
304 | struct mtd_concat *concat = CONCAT(mtd); | |
305 | int err = -EINVAL; | |
306 | int i; | |
307 | ||
308 | if (!(mtd->flags & MTD_WRITEABLE)) | |
309 | return -EROFS; | |
310 | ||
311 | *retlen = 0; | |
312 | ||
313 | for (i = 0; i < concat->num_subdev; i++) { | |
314 | struct mtd_info *subdev = concat->subdev[i]; | |
315 | size_t size, retsize; | |
316 | ||
317 | if (to >= subdev->size) { | |
318 | size = 0; | |
319 | to -= subdev->size; | |
320 | continue; | |
321 | } | |
322 | if (to + len > subdev->size) | |
323 | size = subdev->size - to; | |
324 | else | |
325 | size = len; | |
326 | ||
327 | if (!(subdev->flags & MTD_WRITEABLE)) | |
328 | err = -EROFS; | |
329 | else if (subdev->write_oob) | |
330 | err = subdev->write_oob(subdev, to, size, &retsize, | |
331 | buf); | |
332 | else | |
333 | err = -EINVAL; | |
334 | ||
335 | if (err) | |
336 | break; | |
337 | ||
338 | *retlen += retsize; | |
339 | len -= size; | |
340 | if (len == 0) | |
341 | break; | |
342 | ||
343 | err = -EINVAL; | |
344 | buf += size; | |
345 | to = 0; | |
346 | } | |
347 | return err; | |
348 | } | |
349 | ||
350 | static void concat_erase_callback(struct erase_info *instr) | |
351 | { | |
352 | wake_up((wait_queue_head_t *) instr->priv); | |
353 | } | |
354 | ||
355 | static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase) | |
356 | { | |
357 | int err; | |
358 | wait_queue_head_t waitq; | |
359 | DECLARE_WAITQUEUE(wait, current); | |
360 | ||
361 | /* | |
362 | * This code was stol^H^H^H^Hinspired by mtdchar.c | |
363 | */ | |
364 | init_waitqueue_head(&waitq); | |
365 | ||
366 | erase->mtd = mtd; | |
367 | erase->callback = concat_erase_callback; | |
368 | erase->priv = (unsigned long) &waitq; | |
369 | ||
370 | /* | |
371 | * FIXME: Allow INTERRUPTIBLE. Which means | |
372 | * not having the wait_queue head on the stack. | |
373 | */ | |
374 | err = mtd->erase(mtd, erase); | |
375 | if (!err) { | |
376 | set_current_state(TASK_UNINTERRUPTIBLE); | |
377 | add_wait_queue(&waitq, &wait); | |
378 | if (erase->state != MTD_ERASE_DONE | |
379 | && erase->state != MTD_ERASE_FAILED) | |
380 | schedule(); | |
381 | remove_wait_queue(&waitq, &wait); | |
382 | set_current_state(TASK_RUNNING); | |
383 | ||
384 | err = (erase->state == MTD_ERASE_FAILED) ? -EIO : 0; | |
385 | } | |
386 | return err; | |
387 | } | |
388 | ||
389 | static int concat_erase(struct mtd_info *mtd, struct erase_info *instr) | |
390 | { | |
391 | struct mtd_concat *concat = CONCAT(mtd); | |
392 | struct mtd_info *subdev; | |
393 | int i, err; | |
394 | u_int32_t length, offset = 0; | |
395 | struct erase_info *erase; | |
396 | ||
397 | if (!(mtd->flags & MTD_WRITEABLE)) | |
398 | return -EROFS; | |
399 | ||
400 | if (instr->addr > concat->mtd.size) | |
401 | return -EINVAL; | |
402 | ||
403 | if (instr->len + instr->addr > concat->mtd.size) | |
404 | return -EINVAL; | |
405 | ||
406 | /* | |
407 | * Check for proper erase block alignment of the to-be-erased area. | |
408 | * It is easier to do this based on the super device's erase | |
409 | * region info rather than looking at each particular sub-device | |
410 | * in turn. | |
411 | */ | |
412 | if (!concat->mtd.numeraseregions) { | |
413 | /* the easy case: device has uniform erase block size */ | |
414 | if (instr->addr & (concat->mtd.erasesize - 1)) | |
415 | return -EINVAL; | |
416 | if (instr->len & (concat->mtd.erasesize - 1)) | |
417 | return -EINVAL; | |
418 | } else { | |
419 | /* device has variable erase size */ | |
420 | struct mtd_erase_region_info *erase_regions = | |
421 | concat->mtd.eraseregions; | |
422 | ||
423 | /* | |
424 | * Find the erase region where the to-be-erased area begins: | |
425 | */ | |
426 | for (i = 0; i < concat->mtd.numeraseregions && | |
427 | instr->addr >= erase_regions[i].offset; i++) ; | |
428 | --i; | |
429 | ||
430 | /* | |
431 | * Now erase_regions[i] is the region in which the | |
432 | * to-be-erased area begins. Verify that the starting | |
433 | * offset is aligned to this region's erase size: | |
434 | */ | |
435 | if (instr->addr & (erase_regions[i].erasesize - 1)) | |
436 | return -EINVAL; | |
437 | ||
438 | /* | |
439 | * now find the erase region where the to-be-erased area ends: | |
440 | */ | |
441 | for (; i < concat->mtd.numeraseregions && | |
442 | (instr->addr + instr->len) >= erase_regions[i].offset; | |
443 | ++i) ; | |
444 | --i; | |
445 | /* | |
446 | * check if the ending offset is aligned to this region's erase size | |
447 | */ | |
448 | if ((instr->addr + instr->len) & (erase_regions[i].erasesize - | |
449 | 1)) | |
450 | return -EINVAL; | |
451 | } | |
452 | ||
453 | instr->fail_addr = 0xffffffff; | |
454 | ||
455 | /* make a local copy of instr to avoid modifying the caller's struct */ | |
456 | erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL); | |
457 | ||
458 | if (!erase) | |
459 | return -ENOMEM; | |
460 | ||
461 | *erase = *instr; | |
462 | length = instr->len; | |
463 | ||
464 | /* | |
465 | * find the subdevice where the to-be-erased area begins, adjust | |
466 | * starting offset to be relative to the subdevice start | |
467 | */ | |
468 | for (i = 0; i < concat->num_subdev; i++) { | |
469 | subdev = concat->subdev[i]; | |
470 | if (subdev->size <= erase->addr) { | |
471 | erase->addr -= subdev->size; | |
472 | offset += subdev->size; | |
473 | } else { | |
474 | break; | |
475 | } | |
476 | } | |
477 | ||
478 | /* must never happen since size limit has been verified above */ | |
479 | if (i >= concat->num_subdev) | |
480 | BUG(); | |
481 | ||
482 | /* now do the erase: */ | |
483 | err = 0; | |
484 | for (; length > 0; i++) { | |
485 | /* loop for all subdevices affected by this request */ | |
486 | subdev = concat->subdev[i]; /* get current subdevice */ | |
487 | ||
488 | /* limit length to subdevice's size: */ | |
489 | if (erase->addr + length > subdev->size) | |
490 | erase->len = subdev->size - erase->addr; | |
491 | else | |
492 | erase->len = length; | |
493 | ||
494 | if (!(subdev->flags & MTD_WRITEABLE)) { | |
495 | err = -EROFS; | |
496 | break; | |
497 | } | |
498 | length -= erase->len; | |
499 | if ((err = concat_dev_erase(subdev, erase))) { | |
500 | /* sanity check: should never happen since | |
501 | * block alignment has been checked above */ | |
502 | if (err == -EINVAL) | |
503 | BUG(); | |
504 | if (erase->fail_addr != 0xffffffff) | |
505 | instr->fail_addr = erase->fail_addr + offset; | |
506 | break; | |
507 | } | |
508 | /* | |
509 | * erase->addr specifies the offset of the area to be | |
510 | * erased *within the current subdevice*. It can be | |
511 | * non-zero only the first time through this loop, i.e. | |
512 | * for the first subdevice where blocks need to be erased. | |
513 | * All the following erases must begin at the start of the | |
514 | * current subdevice, i.e. at offset zero. | |
515 | */ | |
516 | erase->addr = 0; | |
517 | offset += subdev->size; | |
518 | } | |
519 | instr->state = erase->state; | |
520 | kfree(erase); | |
521 | if (err) | |
522 | return err; | |
523 | ||
524 | if (instr->callback) | |
525 | instr->callback(instr); | |
526 | return 0; | |
527 | } | |
528 | ||
529 | static int concat_lock(struct mtd_info *mtd, loff_t ofs, size_t len) | |
530 | { | |
531 | struct mtd_concat *concat = CONCAT(mtd); | |
532 | int i, err = -EINVAL; | |
533 | ||
534 | if ((len + ofs) > mtd->size) | |
535 | return -EINVAL; | |
536 | ||
537 | for (i = 0; i < concat->num_subdev; i++) { | |
538 | struct mtd_info *subdev = concat->subdev[i]; | |
539 | size_t size; | |
540 | ||
541 | if (ofs >= subdev->size) { | |
542 | size = 0; | |
543 | ofs -= subdev->size; | |
544 | continue; | |
545 | } | |
546 | if (ofs + len > subdev->size) | |
547 | size = subdev->size - ofs; | |
548 | else | |
549 | size = len; | |
550 | ||
551 | err = subdev->lock(subdev, ofs, size); | |
552 | ||
553 | if (err) | |
554 | break; | |
555 | ||
556 | len -= size; | |
557 | if (len == 0) | |
558 | break; | |
559 | ||
560 | err = -EINVAL; | |
561 | ofs = 0; | |
562 | } | |
563 | ||
564 | return err; | |
565 | } | |
566 | ||
567 | static int concat_unlock(struct mtd_info *mtd, loff_t ofs, size_t len) | |
568 | { | |
569 | struct mtd_concat *concat = CONCAT(mtd); | |
570 | int i, err = 0; | |
571 | ||
572 | if ((len + ofs) > mtd->size) | |
573 | return -EINVAL; | |
574 | ||
575 | for (i = 0; i < concat->num_subdev; i++) { | |
576 | struct mtd_info *subdev = concat->subdev[i]; | |
577 | size_t size; | |
578 | ||
579 | if (ofs >= subdev->size) { | |
580 | size = 0; | |
581 | ofs -= subdev->size; | |
582 | continue; | |
583 | } | |
584 | if (ofs + len > subdev->size) | |
585 | size = subdev->size - ofs; | |
586 | else | |
587 | size = len; | |
588 | ||
589 | err = subdev->unlock(subdev, ofs, size); | |
590 | ||
591 | if (err) | |
592 | break; | |
593 | ||
594 | len -= size; | |
595 | if (len == 0) | |
596 | break; | |
597 | ||
598 | err = -EINVAL; | |
599 | ofs = 0; | |
600 | } | |
601 | ||
602 | return err; | |
603 | } | |
604 | ||
605 | static void concat_sync(struct mtd_info *mtd) | |
606 | { | |
607 | struct mtd_concat *concat = CONCAT(mtd); | |
608 | int i; | |
609 | ||
610 | for (i = 0; i < concat->num_subdev; i++) { | |
611 | struct mtd_info *subdev = concat->subdev[i]; | |
612 | subdev->sync(subdev); | |
613 | } | |
614 | } | |
615 | ||
616 | static int concat_suspend(struct mtd_info *mtd) | |
617 | { | |
618 | struct mtd_concat *concat = CONCAT(mtd); | |
619 | int i, rc = 0; | |
620 | ||
621 | for (i = 0; i < concat->num_subdev; i++) { | |
622 | struct mtd_info *subdev = concat->subdev[i]; | |
623 | if ((rc = subdev->suspend(subdev)) < 0) | |
624 | return rc; | |
625 | } | |
626 | return rc; | |
627 | } | |
628 | ||
629 | static void concat_resume(struct mtd_info *mtd) | |
630 | { | |
631 | struct mtd_concat *concat = CONCAT(mtd); | |
632 | int i; | |
633 | ||
634 | for (i = 0; i < concat->num_subdev; i++) { | |
635 | struct mtd_info *subdev = concat->subdev[i]; | |
636 | subdev->resume(subdev); | |
637 | } | |
638 | } | |
639 | ||
640 | /* | |
641 | * This function constructs a virtual MTD device by concatenating | |
642 | * num_devs MTD devices. A pointer to the new device object is | |
643 | * stored to *new_dev upon success. This function does _not_ | |
644 | * register any devices: this is the caller's responsibility. | |
645 | */ | |
646 | struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to concatenate */ | |
647 | int num_devs, /* number of subdevices */ | |
648 | char *name) | |
649 | { /* name for the new device */ | |
650 | int i; | |
651 | size_t size; | |
652 | struct mtd_concat *concat; | |
653 | u_int32_t max_erasesize, curr_erasesize; | |
654 | int num_erase_region; | |
655 | ||
656 | printk(KERN_NOTICE "Concatenating MTD devices:\n"); | |
657 | for (i = 0; i < num_devs; i++) | |
658 | printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name); | |
659 | printk(KERN_NOTICE "into device \"%s\"\n", name); | |
660 | ||
661 | /* allocate the device structure */ | |
662 | size = SIZEOF_STRUCT_MTD_CONCAT(num_devs); | |
663 | concat = kmalloc(size, GFP_KERNEL); | |
664 | if (!concat) { | |
665 | printk | |
666 | ("memory allocation error while creating concatenated device \"%s\"\n", | |
667 | name); | |
668 | return NULL; | |
669 | } | |
670 | memset(concat, 0, size); | |
671 | concat->subdev = (struct mtd_info **) (concat + 1); | |
672 | ||
673 | /* | |
674 | * Set up the new "super" device's MTD object structure, check for | |
675 | * incompatibilites between the subdevices. | |
676 | */ | |
677 | concat->mtd.type = subdev[0]->type; | |
678 | concat->mtd.flags = subdev[0]->flags; | |
679 | concat->mtd.size = subdev[0]->size; | |
680 | concat->mtd.erasesize = subdev[0]->erasesize; | |
681 | concat->mtd.oobblock = subdev[0]->oobblock; | |
682 | concat->mtd.oobsize = subdev[0]->oobsize; | |
683 | concat->mtd.ecctype = subdev[0]->ecctype; | |
684 | concat->mtd.eccsize = subdev[0]->eccsize; | |
685 | if (subdev[0]->read_ecc) | |
686 | concat->mtd.read_ecc = concat_read_ecc; | |
687 | if (subdev[0]->write_ecc) | |
688 | concat->mtd.write_ecc = concat_write_ecc; | |
689 | if (subdev[0]->read_oob) | |
690 | concat->mtd.read_oob = concat_read_oob; | |
691 | if (subdev[0]->write_oob) | |
692 | concat->mtd.write_oob = concat_write_oob; | |
693 | ||
694 | concat->subdev[0] = subdev[0]; | |
695 | ||
696 | for (i = 1; i < num_devs; i++) { | |
697 | if (concat->mtd.type != subdev[i]->type) { | |
698 | kfree(concat); | |
699 | printk("Incompatible device type on \"%s\"\n", | |
700 | subdev[i]->name); | |
701 | return NULL; | |
702 | } | |
703 | if (concat->mtd.flags != subdev[i]->flags) { | |
704 | /* | |
705 | * Expect all flags except MTD_WRITEABLE to be | |
706 | * equal on all subdevices. | |
707 | */ | |
708 | if ((concat->mtd.flags ^ subdev[i]-> | |
709 | flags) & ~MTD_WRITEABLE) { | |
710 | kfree(concat); | |
711 | printk("Incompatible device flags on \"%s\"\n", | |
712 | subdev[i]->name); | |
713 | return NULL; | |
714 | } else | |
715 | /* if writeable attribute differs, | |
716 | make super device writeable */ | |
717 | concat->mtd.flags |= | |
718 | subdev[i]->flags & MTD_WRITEABLE; | |
719 | } | |
720 | concat->mtd.size += subdev[i]->size; | |
721 | if (concat->mtd.oobblock != subdev[i]->oobblock || | |
722 | concat->mtd.oobsize != subdev[i]->oobsize || | |
723 | concat->mtd.ecctype != subdev[i]->ecctype || | |
724 | concat->mtd.eccsize != subdev[i]->eccsize || | |
725 | !concat->mtd.read_ecc != !subdev[i]->read_ecc || | |
726 | !concat->mtd.write_ecc != !subdev[i]->write_ecc || | |
727 | !concat->mtd.read_oob != !subdev[i]->read_oob || | |
728 | !concat->mtd.write_oob != !subdev[i]->write_oob) { | |
729 | kfree(concat); | |
730 | printk("Incompatible OOB or ECC data on \"%s\"\n", | |
731 | subdev[i]->name); | |
732 | return NULL; | |
733 | } | |
734 | concat->subdev[i] = subdev[i]; | |
735 | ||
736 | } | |
737 | ||
738 | concat->num_subdev = num_devs; | |
739 | concat->mtd.name = name; | |
740 | ||
741 | /* | |
742 | * NOTE: for now, we do not provide any readv()/writev() methods | |
743 | * because they are messy to implement and they are not | |
744 | * used to a great extent anyway. | |
745 | */ | |
746 | concat->mtd.erase = concat_erase; | |
747 | concat->mtd.read = concat_read; | |
748 | concat->mtd.write = concat_write; | |
749 | concat->mtd.sync = concat_sync; | |
750 | concat->mtd.lock = concat_lock; | |
751 | concat->mtd.unlock = concat_unlock; | |
752 | concat->mtd.suspend = concat_suspend; | |
753 | concat->mtd.resume = concat_resume; | |
754 | ||
755 | /* | |
756 | * Combine the erase block size info of the subdevices: | |
757 | * | |
758 | * first, walk the map of the new device and see how | |
759 | * many changes in erase size we have | |
760 | */ | |
761 | max_erasesize = curr_erasesize = subdev[0]->erasesize; | |
762 | num_erase_region = 1; | |
763 | for (i = 0; i < num_devs; i++) { | |
764 | if (subdev[i]->numeraseregions == 0) { | |
765 | /* current subdevice has uniform erase size */ | |
766 | if (subdev[i]->erasesize != curr_erasesize) { | |
767 | /* if it differs from the last subdevice's erase size, count it */ | |
768 | ++num_erase_region; | |
769 | curr_erasesize = subdev[i]->erasesize; | |
770 | if (curr_erasesize > max_erasesize) | |
771 | max_erasesize = curr_erasesize; | |
772 | } | |
773 | } else { | |
774 | /* current subdevice has variable erase size */ | |
775 | int j; | |
776 | for (j = 0; j < subdev[i]->numeraseregions; j++) { | |
777 | ||
778 | /* walk the list of erase regions, count any changes */ | |
779 | if (subdev[i]->eraseregions[j].erasesize != | |
780 | curr_erasesize) { | |
781 | ++num_erase_region; | |
782 | curr_erasesize = | |
783 | subdev[i]->eraseregions[j]. | |
784 | erasesize; | |
785 | if (curr_erasesize > max_erasesize) | |
786 | max_erasesize = curr_erasesize; | |
787 | } | |
788 | } | |
789 | } | |
790 | } | |
791 | ||
792 | if (num_erase_region == 1) { | |
793 | /* | |
794 | * All subdevices have the same uniform erase size. | |
795 | * This is easy: | |
796 | */ | |
797 | concat->mtd.erasesize = curr_erasesize; | |
798 | concat->mtd.numeraseregions = 0; | |
799 | } else { | |
800 | /* | |
801 | * erase block size varies across the subdevices: allocate | |
802 | * space to store the data describing the variable erase regions | |
803 | */ | |
804 | struct mtd_erase_region_info *erase_region_p; | |
805 | u_int32_t begin, position; | |
806 | ||
807 | concat->mtd.erasesize = max_erasesize; | |
808 | concat->mtd.numeraseregions = num_erase_region; | |
809 | concat->mtd.eraseregions = erase_region_p = | |
810 | kmalloc(num_erase_region * | |
811 | sizeof (struct mtd_erase_region_info), GFP_KERNEL); | |
812 | if (!erase_region_p) { | |
813 | kfree(concat); | |
814 | printk | |
815 | ("memory allocation error while creating erase region list" | |
816 | " for device \"%s\"\n", name); | |
817 | return NULL; | |
818 | } | |
819 | ||
820 | /* | |
821 | * walk the map of the new device once more and fill in | |
822 | * in erase region info: | |
823 | */ | |
824 | curr_erasesize = subdev[0]->erasesize; | |
825 | begin = position = 0; | |
826 | for (i = 0; i < num_devs; i++) { | |
827 | if (subdev[i]->numeraseregions == 0) { | |
828 | /* current subdevice has uniform erase size */ | |
829 | if (subdev[i]->erasesize != curr_erasesize) { | |
830 | /* | |
831 | * fill in an mtd_erase_region_info structure for the area | |
832 | * we have walked so far: | |
833 | */ | |
834 | erase_region_p->offset = begin; | |
835 | erase_region_p->erasesize = | |
836 | curr_erasesize; | |
837 | erase_region_p->numblocks = | |
838 | (position - begin) / curr_erasesize; | |
839 | begin = position; | |
840 | ||
841 | curr_erasesize = subdev[i]->erasesize; | |
842 | ++erase_region_p; | |
843 | } | |
844 | position += subdev[i]->size; | |
845 | } else { | |
846 | /* current subdevice has variable erase size */ | |
847 | int j; | |
848 | for (j = 0; j < subdev[i]->numeraseregions; j++) { | |
849 | /* walk the list of erase regions, count any changes */ | |
850 | if (subdev[i]->eraseregions[j]. | |
851 | erasesize != curr_erasesize) { | |
852 | erase_region_p->offset = begin; | |
853 | erase_region_p->erasesize = | |
854 | curr_erasesize; | |
855 | erase_region_p->numblocks = | |
856 | (position - | |
857 | begin) / curr_erasesize; | |
858 | begin = position; | |
859 | ||
860 | curr_erasesize = | |
861 | subdev[i]->eraseregions[j]. | |
862 | erasesize; | |
863 | ++erase_region_p; | |
864 | } | |
865 | position += | |
866 | subdev[i]->eraseregions[j]. | |
867 | numblocks * curr_erasesize; | |
868 | } | |
869 | } | |
870 | } | |
871 | /* Now write the final entry */ | |
872 | erase_region_p->offset = begin; | |
873 | erase_region_p->erasesize = curr_erasesize; | |
874 | erase_region_p->numblocks = (position - begin) / curr_erasesize; | |
875 | } | |
876 | ||
877 | return &concat->mtd; | |
878 | } | |
879 | ||
880 | /* | |
881 | * This function destroys an MTD object obtained from concat_mtd_devs() | |
882 | */ | |
883 | ||
884 | void mtd_concat_destroy(struct mtd_info *mtd) | |
885 | { | |
886 | struct mtd_concat *concat = CONCAT(mtd); | |
887 | if (concat->mtd.numeraseregions) | |
888 | kfree(concat->mtd.eraseregions); | |
889 | kfree(concat); | |
890 | } | |
891 | ||
892 | EXPORT_SYMBOL(mtd_concat_create); | |
893 | EXPORT_SYMBOL(mtd_concat_destroy); | |
894 | ||
895 | MODULE_LICENSE("GPL"); | |
896 | MODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>"); | |
897 | MODULE_DESCRIPTION("Generic support for concatenating of MTD devices"); |