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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 | |
1da177e4 LT |
9 | */ |
10 | ||
1da177e4 | 11 | #include <linux/kernel.h> |
15fdc52f | 12 | #include <linux/module.h> |
1da177e4 | 13 | #include <linux/slab.h> |
15fdc52f TG |
14 | #include <linux/sched.h> |
15 | #include <linux/types.h> | |
6e232cfc | 16 | #include <linux/backing-dev.h> |
15fdc52f | 17 | |
1da177e4 LT |
18 | #include <linux/mtd/mtd.h> |
19 | #include <linux/mtd/concat.h> | |
20 | ||
6c8b44ab AM |
21 | #include <asm/div64.h> |
22 | ||
1da177e4 LT |
23 | /* |
24 | * Our storage structure: | |
25 | * Subdev points to an array of pointers to struct mtd_info objects | |
26 | * which is allocated along with this structure | |
27 | * | |
28 | */ | |
29 | struct mtd_concat { | |
30 | struct mtd_info mtd; | |
31 | int num_subdev; | |
32 | struct mtd_info **subdev; | |
33 | }; | |
34 | ||
35 | /* | |
36 | * how to calculate the size required for the above structure, | |
37 | * including the pointer array subdev points to: | |
38 | */ | |
39 | #define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \ | |
40 | ((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *))) | |
41 | ||
42 | /* | |
43 | * Given a pointer to the MTD object in the mtd_concat structure, | |
44 | * we can retrieve the pointer to that structure with this macro. | |
45 | */ | |
46 | #define CONCAT(x) ((struct mtd_concat *)(x)) | |
47 | ||
97894cda | 48 | /* |
1da177e4 LT |
49 | * MTD methods which look up the relevant subdevice, translate the |
50 | * effective address and pass through to the subdevice. | |
51 | */ | |
52 | ||
53 | static int | |
54 | concat_read(struct mtd_info *mtd, loff_t from, size_t len, | |
55 | size_t * retlen, u_char * buf) | |
56 | { | |
57 | struct mtd_concat *concat = CONCAT(mtd); | |
f1a28c02 | 58 | int ret = 0, err; |
1da177e4 LT |
59 | int i; |
60 | ||
61 | *retlen = 0; | |
62 | ||
63 | for (i = 0; i < concat->num_subdev; i++) { | |
64 | struct mtd_info *subdev = concat->subdev[i]; | |
65 | size_t size, retsize; | |
66 | ||
67 | if (from >= subdev->size) { | |
68 | /* Not destined for this subdev */ | |
69 | size = 0; | |
70 | from -= subdev->size; | |
71 | continue; | |
72 | } | |
73 | if (from + len > subdev->size) | |
74 | /* First part goes into this subdev */ | |
75 | size = subdev->size - from; | |
76 | else | |
77 | /* Entire transaction goes into this subdev */ | |
78 | size = len; | |
79 | ||
80 | err = subdev->read(subdev, from, size, &retsize, buf); | |
81 | ||
9a1fcdfd | 82 | /* Save information about bitflips! */ |
f1a28c02 TG |
83 | if (unlikely(err)) { |
84 | if (err == -EBADMSG) { | |
85 | mtd->ecc_stats.failed++; | |
9a1fcdfd | 86 | ret = err; |
f1a28c02 TG |
87 | } else if (err == -EUCLEAN) { |
88 | mtd->ecc_stats.corrected++; | |
89 | /* Do not overwrite -EBADMSG !! */ | |
90 | if (!ret) | |
91 | ret = err; | |
92 | } else | |
93 | return err; | |
9a1fcdfd TG |
94 | } |
95 | ||
1da177e4 LT |
96 | *retlen += retsize; |
97 | len -= size; | |
98 | if (len == 0) | |
f1a28c02 | 99 | return ret; |
1da177e4 | 100 | |
1da177e4 LT |
101 | buf += size; |
102 | from = 0; | |
103 | } | |
f1a28c02 | 104 | return -EINVAL; |
1da177e4 LT |
105 | } |
106 | ||
107 | static int | |
108 | concat_write(struct mtd_info *mtd, loff_t to, size_t len, | |
109 | size_t * retlen, const u_char * buf) | |
110 | { | |
111 | struct mtd_concat *concat = CONCAT(mtd); | |
112 | int err = -EINVAL; | |
113 | int i; | |
114 | ||
115 | if (!(mtd->flags & MTD_WRITEABLE)) | |
116 | return -EROFS; | |
117 | ||
118 | *retlen = 0; | |
119 | ||
120 | for (i = 0; i < concat->num_subdev; i++) { | |
121 | struct mtd_info *subdev = concat->subdev[i]; | |
122 | size_t size, retsize; | |
123 | ||
124 | if (to >= subdev->size) { | |
125 | size = 0; | |
126 | to -= subdev->size; | |
127 | continue; | |
128 | } | |
129 | if (to + len > subdev->size) | |
130 | size = subdev->size - to; | |
131 | else | |
132 | size = len; | |
133 | ||
134 | if (!(subdev->flags & MTD_WRITEABLE)) | |
135 | err = -EROFS; | |
136 | else | |
137 | err = subdev->write(subdev, to, size, &retsize, buf); | |
138 | ||
139 | if (err) | |
140 | break; | |
141 | ||
142 | *retlen += retsize; | |
143 | len -= size; | |
144 | if (len == 0) | |
145 | break; | |
146 | ||
147 | err = -EINVAL; | |
148 | buf += size; | |
149 | to = 0; | |
150 | } | |
151 | return err; | |
152 | } | |
153 | ||
e8d32937 | 154 | static int |
9d8522df TG |
155 | concat_writev(struct mtd_info *mtd, const struct kvec *vecs, |
156 | unsigned long count, loff_t to, size_t * retlen) | |
e8d32937 AB |
157 | { |
158 | struct mtd_concat *concat = CONCAT(mtd); | |
159 | struct kvec *vecs_copy; | |
160 | unsigned long entry_low, entry_high; | |
161 | size_t total_len = 0; | |
162 | int i; | |
163 | int err = -EINVAL; | |
164 | ||
165 | if (!(mtd->flags & MTD_WRITEABLE)) | |
166 | return -EROFS; | |
167 | ||
168 | *retlen = 0; | |
169 | ||
170 | /* Calculate total length of data */ | |
171 | for (i = 0; i < count; i++) | |
172 | total_len += vecs[i].iov_len; | |
173 | ||
174 | /* Do not allow write past end of device */ | |
175 | if ((to + total_len) > mtd->size) | |
176 | return -EINVAL; | |
177 | ||
178 | /* Check alignment */ | |
28318776 | 179 | if (mtd->writesize > 1) { |
0bf9733d | 180 | uint64_t __to = to; |
28318776 | 181 | if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize)) |
e8d32937 | 182 | return -EINVAL; |
6c8b44ab | 183 | } |
e8d32937 AB |
184 | |
185 | /* make a copy of vecs */ | |
d80f2666 | 186 | vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL); |
e8d32937 AB |
187 | if (!vecs_copy) |
188 | return -ENOMEM; | |
e8d32937 AB |
189 | |
190 | entry_low = 0; | |
191 | for (i = 0; i < concat->num_subdev; i++) { | |
192 | struct mtd_info *subdev = concat->subdev[i]; | |
193 | size_t size, wsize, retsize, old_iov_len; | |
194 | ||
195 | if (to >= subdev->size) { | |
196 | to -= subdev->size; | |
197 | continue; | |
198 | } | |
199 | ||
69423d99 | 200 | size = min_t(uint64_t, total_len, subdev->size - to); |
e8d32937 AB |
201 | wsize = size; /* store for future use */ |
202 | ||
203 | entry_high = entry_low; | |
204 | while (entry_high < count) { | |
205 | if (size <= vecs_copy[entry_high].iov_len) | |
206 | break; | |
207 | size -= vecs_copy[entry_high++].iov_len; | |
208 | } | |
209 | ||
210 | old_iov_len = vecs_copy[entry_high].iov_len; | |
211 | vecs_copy[entry_high].iov_len = size; | |
212 | ||
213 | if (!(subdev->flags & MTD_WRITEABLE)) | |
214 | err = -EROFS; | |
e8d32937 AB |
215 | else |
216 | err = subdev->writev(subdev, &vecs_copy[entry_low], | |
217 | entry_high - entry_low + 1, to, &retsize); | |
218 | ||
219 | vecs_copy[entry_high].iov_len = old_iov_len - size; | |
220 | vecs_copy[entry_high].iov_base += size; | |
221 | ||
222 | entry_low = entry_high; | |
223 | ||
224 | if (err) | |
225 | break; | |
226 | ||
227 | *retlen += retsize; | |
228 | total_len -= wsize; | |
e8d32937 AB |
229 | |
230 | if (total_len == 0) | |
231 | break; | |
232 | ||
233 | err = -EINVAL; | |
234 | to = 0; | |
235 | } | |
236 | ||
237 | kfree(vecs_copy); | |
238 | return err; | |
239 | } | |
240 | ||
1da177e4 | 241 | static int |
8593fbc6 | 242 | concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) |
1da177e4 LT |
243 | { |
244 | struct mtd_concat *concat = CONCAT(mtd); | |
8593fbc6 | 245 | struct mtd_oob_ops devops = *ops; |
f1a28c02 | 246 | int i, err, ret = 0; |
1da177e4 | 247 | |
7014568b | 248 | ops->retlen = ops->oobretlen = 0; |
1da177e4 LT |
249 | |
250 | for (i = 0; i < concat->num_subdev; i++) { | |
251 | struct mtd_info *subdev = concat->subdev[i]; | |
1da177e4 LT |
252 | |
253 | if (from >= subdev->size) { | |
1da177e4 LT |
254 | from -= subdev->size; |
255 | continue; | |
256 | } | |
1da177e4 | 257 | |
8593fbc6 TG |
258 | /* partial read ? */ |
259 | if (from + devops.len > subdev->size) | |
260 | devops.len = subdev->size - from; | |
1da177e4 | 261 | |
8593fbc6 TG |
262 | err = subdev->read_oob(subdev, from, &devops); |
263 | ops->retlen += devops.retlen; | |
7014568b | 264 | ops->oobretlen += devops.oobretlen; |
f1a28c02 TG |
265 | |
266 | /* Save information about bitflips! */ | |
267 | if (unlikely(err)) { | |
268 | if (err == -EBADMSG) { | |
269 | mtd->ecc_stats.failed++; | |
270 | ret = err; | |
271 | } else if (err == -EUCLEAN) { | |
272 | mtd->ecc_stats.corrected++; | |
273 | /* Do not overwrite -EBADMSG !! */ | |
274 | if (!ret) | |
275 | ret = err; | |
276 | } else | |
277 | return err; | |
278 | } | |
1da177e4 | 279 | |
7014568b VW |
280 | if (devops.datbuf) { |
281 | devops.len = ops->len - ops->retlen; | |
282 | if (!devops.len) | |
283 | return ret; | |
8593fbc6 | 284 | devops.datbuf += devops.retlen; |
7014568b VW |
285 | } |
286 | if (devops.oobbuf) { | |
287 | devops.ooblen = ops->ooblen - ops->oobretlen; | |
288 | if (!devops.ooblen) | |
289 | return ret; | |
290 | devops.oobbuf += ops->oobretlen; | |
291 | } | |
1da177e4 | 292 | |
1da177e4 LT |
293 | from = 0; |
294 | } | |
8593fbc6 | 295 | return -EINVAL; |
1da177e4 LT |
296 | } |
297 | ||
298 | static int | |
8593fbc6 | 299 | concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops) |
1da177e4 LT |
300 | { |
301 | struct mtd_concat *concat = CONCAT(mtd); | |
8593fbc6 TG |
302 | struct mtd_oob_ops devops = *ops; |
303 | int i, err; | |
1da177e4 LT |
304 | |
305 | if (!(mtd->flags & MTD_WRITEABLE)) | |
306 | return -EROFS; | |
307 | ||
8593fbc6 | 308 | ops->retlen = 0; |
1da177e4 LT |
309 | |
310 | for (i = 0; i < concat->num_subdev; i++) { | |
311 | struct mtd_info *subdev = concat->subdev[i]; | |
1da177e4 LT |
312 | |
313 | if (to >= subdev->size) { | |
1da177e4 LT |
314 | to -= subdev->size; |
315 | continue; | |
316 | } | |
1da177e4 | 317 | |
8593fbc6 TG |
318 | /* partial write ? */ |
319 | if (to + devops.len > subdev->size) | |
320 | devops.len = subdev->size - to; | |
1da177e4 | 321 | |
8593fbc6 TG |
322 | err = subdev->write_oob(subdev, to, &devops); |
323 | ops->retlen += devops.retlen; | |
1da177e4 | 324 | if (err) |
8593fbc6 | 325 | return err; |
1da177e4 | 326 | |
7014568b VW |
327 | if (devops.datbuf) { |
328 | devops.len = ops->len - ops->retlen; | |
329 | if (!devops.len) | |
330 | return 0; | |
8593fbc6 | 331 | devops.datbuf += devops.retlen; |
7014568b VW |
332 | } |
333 | if (devops.oobbuf) { | |
334 | devops.ooblen = ops->ooblen - ops->oobretlen; | |
335 | if (!devops.ooblen) | |
336 | return 0; | |
337 | devops.oobbuf += devops.oobretlen; | |
338 | } | |
1da177e4 LT |
339 | to = 0; |
340 | } | |
8593fbc6 | 341 | return -EINVAL; |
1da177e4 LT |
342 | } |
343 | ||
344 | static void concat_erase_callback(struct erase_info *instr) | |
345 | { | |
346 | wake_up((wait_queue_head_t *) instr->priv); | |
347 | } | |
348 | ||
349 | static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase) | |
350 | { | |
351 | int err; | |
352 | wait_queue_head_t waitq; | |
353 | DECLARE_WAITQUEUE(wait, current); | |
354 | ||
355 | /* | |
356 | * This code was stol^H^H^H^Hinspired by mtdchar.c | |
357 | */ | |
358 | init_waitqueue_head(&waitq); | |
359 | ||
360 | erase->mtd = mtd; | |
361 | erase->callback = concat_erase_callback; | |
362 | erase->priv = (unsigned long) &waitq; | |
363 | ||
364 | /* | |
365 | * FIXME: Allow INTERRUPTIBLE. Which means | |
366 | * not having the wait_queue head on the stack. | |
367 | */ | |
368 | err = mtd->erase(mtd, erase); | |
369 | if (!err) { | |
370 | set_current_state(TASK_UNINTERRUPTIBLE); | |
371 | add_wait_queue(&waitq, &wait); | |
372 | if (erase->state != MTD_ERASE_DONE | |
373 | && erase->state != MTD_ERASE_FAILED) | |
374 | schedule(); | |
375 | remove_wait_queue(&waitq, &wait); | |
376 | set_current_state(TASK_RUNNING); | |
377 | ||
378 | err = (erase->state == MTD_ERASE_FAILED) ? -EIO : 0; | |
379 | } | |
380 | return err; | |
381 | } | |
382 | ||
383 | static int concat_erase(struct mtd_info *mtd, struct erase_info *instr) | |
384 | { | |
385 | struct mtd_concat *concat = CONCAT(mtd); | |
386 | struct mtd_info *subdev; | |
387 | int i, err; | |
69423d99 | 388 | uint64_t length, offset = 0; |
1da177e4 LT |
389 | struct erase_info *erase; |
390 | ||
391 | if (!(mtd->flags & MTD_WRITEABLE)) | |
392 | return -EROFS; | |
393 | ||
394 | if (instr->addr > concat->mtd.size) | |
395 | return -EINVAL; | |
396 | ||
397 | if (instr->len + instr->addr > concat->mtd.size) | |
398 | return -EINVAL; | |
399 | ||
400 | /* | |
401 | * Check for proper erase block alignment of the to-be-erased area. | |
402 | * It is easier to do this based on the super device's erase | |
403 | * region info rather than looking at each particular sub-device | |
404 | * in turn. | |
405 | */ | |
406 | if (!concat->mtd.numeraseregions) { | |
407 | /* the easy case: device has uniform erase block size */ | |
408 | if (instr->addr & (concat->mtd.erasesize - 1)) | |
409 | return -EINVAL; | |
410 | if (instr->len & (concat->mtd.erasesize - 1)) | |
411 | return -EINVAL; | |
412 | } else { | |
413 | /* device has variable erase size */ | |
414 | struct mtd_erase_region_info *erase_regions = | |
415 | concat->mtd.eraseregions; | |
416 | ||
417 | /* | |
418 | * Find the erase region where the to-be-erased area begins: | |
419 | */ | |
420 | for (i = 0; i < concat->mtd.numeraseregions && | |
421 | instr->addr >= erase_regions[i].offset; i++) ; | |
422 | --i; | |
423 | ||
424 | /* | |
425 | * Now erase_regions[i] is the region in which the | |
426 | * to-be-erased area begins. Verify that the starting | |
427 | * offset is aligned to this region's erase size: | |
428 | */ | |
ebf2e930 | 429 | if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1)) |
1da177e4 LT |
430 | return -EINVAL; |
431 | ||
432 | /* | |
433 | * now find the erase region where the to-be-erased area ends: | |
434 | */ | |
435 | for (; i < concat->mtd.numeraseregions && | |
436 | (instr->addr + instr->len) >= erase_regions[i].offset; | |
437 | ++i) ; | |
438 | --i; | |
439 | /* | |
440 | * check if the ending offset is aligned to this region's erase size | |
441 | */ | |
ebf2e930 RK |
442 | if (i < 0 || ((instr->addr + instr->len) & |
443 | (erase_regions[i].erasesize - 1))) | |
1da177e4 LT |
444 | return -EINVAL; |
445 | } | |
446 | ||
bb0eb217 | 447 | instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; |
1da177e4 LT |
448 | |
449 | /* make a local copy of instr to avoid modifying the caller's struct */ | |
450 | erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL); | |
451 | ||
452 | if (!erase) | |
453 | return -ENOMEM; | |
454 | ||
455 | *erase = *instr; | |
456 | length = instr->len; | |
457 | ||
458 | /* | |
459 | * find the subdevice where the to-be-erased area begins, adjust | |
460 | * starting offset to be relative to the subdevice start | |
461 | */ | |
462 | for (i = 0; i < concat->num_subdev; i++) { | |
463 | subdev = concat->subdev[i]; | |
464 | if (subdev->size <= erase->addr) { | |
465 | erase->addr -= subdev->size; | |
466 | offset += subdev->size; | |
467 | } else { | |
468 | break; | |
469 | } | |
470 | } | |
471 | ||
472 | /* must never happen since size limit has been verified above */ | |
373ebfbf | 473 | BUG_ON(i >= concat->num_subdev); |
1da177e4 LT |
474 | |
475 | /* now do the erase: */ | |
476 | err = 0; | |
477 | for (; length > 0; i++) { | |
478 | /* loop for all subdevices affected by this request */ | |
479 | subdev = concat->subdev[i]; /* get current subdevice */ | |
480 | ||
481 | /* limit length to subdevice's size: */ | |
482 | if (erase->addr + length > subdev->size) | |
483 | erase->len = subdev->size - erase->addr; | |
484 | else | |
485 | erase->len = length; | |
486 | ||
487 | if (!(subdev->flags & MTD_WRITEABLE)) { | |
488 | err = -EROFS; | |
489 | break; | |
490 | } | |
491 | length -= erase->len; | |
492 | if ((err = concat_dev_erase(subdev, erase))) { | |
493 | /* sanity check: should never happen since | |
494 | * block alignment has been checked above */ | |
373ebfbf | 495 | BUG_ON(err == -EINVAL); |
bb0eb217 | 496 | if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
1da177e4 LT |
497 | instr->fail_addr = erase->fail_addr + offset; |
498 | break; | |
499 | } | |
500 | /* | |
501 | * erase->addr specifies the offset of the area to be | |
502 | * erased *within the current subdevice*. It can be | |
503 | * non-zero only the first time through this loop, i.e. | |
504 | * for the first subdevice where blocks need to be erased. | |
505 | * All the following erases must begin at the start of the | |
506 | * current subdevice, i.e. at offset zero. | |
507 | */ | |
508 | erase->addr = 0; | |
509 | offset += subdev->size; | |
510 | } | |
511 | instr->state = erase->state; | |
512 | kfree(erase); | |
513 | if (err) | |
514 | return err; | |
515 | ||
516 | if (instr->callback) | |
517 | instr->callback(instr); | |
518 | return 0; | |
519 | } | |
520 | ||
69423d99 | 521 | static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 LT |
522 | { |
523 | struct mtd_concat *concat = CONCAT(mtd); | |
524 | int i, err = -EINVAL; | |
525 | ||
526 | if ((len + ofs) > mtd->size) | |
527 | return -EINVAL; | |
528 | ||
529 | for (i = 0; i < concat->num_subdev; i++) { | |
530 | struct mtd_info *subdev = concat->subdev[i]; | |
69423d99 | 531 | uint64_t size; |
1da177e4 LT |
532 | |
533 | if (ofs >= subdev->size) { | |
534 | size = 0; | |
535 | ofs -= subdev->size; | |
536 | continue; | |
537 | } | |
538 | if (ofs + len > subdev->size) | |
539 | size = subdev->size - ofs; | |
540 | else | |
541 | size = len; | |
542 | ||
543 | err = subdev->lock(subdev, ofs, size); | |
544 | ||
545 | if (err) | |
546 | break; | |
547 | ||
548 | len -= size; | |
549 | if (len == 0) | |
550 | break; | |
551 | ||
552 | err = -EINVAL; | |
553 | ofs = 0; | |
554 | } | |
555 | ||
556 | return err; | |
557 | } | |
558 | ||
69423d99 | 559 | static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 LT |
560 | { |
561 | struct mtd_concat *concat = CONCAT(mtd); | |
562 | int i, err = 0; | |
563 | ||
564 | if ((len + ofs) > mtd->size) | |
565 | return -EINVAL; | |
566 | ||
567 | for (i = 0; i < concat->num_subdev; i++) { | |
568 | struct mtd_info *subdev = concat->subdev[i]; | |
69423d99 | 569 | uint64_t size; |
1da177e4 LT |
570 | |
571 | if (ofs >= subdev->size) { | |
572 | size = 0; | |
573 | ofs -= subdev->size; | |
574 | continue; | |
575 | } | |
576 | if (ofs + len > subdev->size) | |
577 | size = subdev->size - ofs; | |
578 | else | |
579 | size = len; | |
580 | ||
581 | err = subdev->unlock(subdev, ofs, size); | |
582 | ||
583 | if (err) | |
584 | break; | |
585 | ||
586 | len -= size; | |
587 | if (len == 0) | |
588 | break; | |
589 | ||
590 | err = -EINVAL; | |
591 | ofs = 0; | |
592 | } | |
593 | ||
594 | return err; | |
595 | } | |
596 | ||
597 | static void concat_sync(struct mtd_info *mtd) | |
598 | { | |
599 | struct mtd_concat *concat = CONCAT(mtd); | |
600 | int i; | |
601 | ||
602 | for (i = 0; i < concat->num_subdev; i++) { | |
603 | struct mtd_info *subdev = concat->subdev[i]; | |
604 | subdev->sync(subdev); | |
605 | } | |
606 | } | |
607 | ||
608 | static int concat_suspend(struct mtd_info *mtd) | |
609 | { | |
610 | struct mtd_concat *concat = CONCAT(mtd); | |
611 | int i, rc = 0; | |
612 | ||
613 | for (i = 0; i < concat->num_subdev; i++) { | |
614 | struct mtd_info *subdev = concat->subdev[i]; | |
615 | if ((rc = subdev->suspend(subdev)) < 0) | |
616 | return rc; | |
617 | } | |
618 | return rc; | |
619 | } | |
620 | ||
621 | static void concat_resume(struct mtd_info *mtd) | |
622 | { | |
623 | struct mtd_concat *concat = CONCAT(mtd); | |
624 | int i; | |
625 | ||
626 | for (i = 0; i < concat->num_subdev; i++) { | |
627 | struct mtd_info *subdev = concat->subdev[i]; | |
628 | subdev->resume(subdev); | |
629 | } | |
630 | } | |
631 | ||
e8d32937 AB |
632 | static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs) |
633 | { | |
634 | struct mtd_concat *concat = CONCAT(mtd); | |
635 | int i, res = 0; | |
636 | ||
637 | if (!concat->subdev[0]->block_isbad) | |
638 | return res; | |
639 | ||
640 | if (ofs > mtd->size) | |
641 | return -EINVAL; | |
642 | ||
643 | for (i = 0; i < concat->num_subdev; i++) { | |
644 | struct mtd_info *subdev = concat->subdev[i]; | |
645 | ||
646 | if (ofs >= subdev->size) { | |
647 | ofs -= subdev->size; | |
648 | continue; | |
649 | } | |
650 | ||
651 | res = subdev->block_isbad(subdev, ofs); | |
652 | break; | |
653 | } | |
654 | ||
655 | return res; | |
656 | } | |
657 | ||
658 | static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs) | |
659 | { | |
660 | struct mtd_concat *concat = CONCAT(mtd); | |
661 | int i, err = -EINVAL; | |
662 | ||
663 | if (!concat->subdev[0]->block_markbad) | |
664 | return 0; | |
665 | ||
666 | if (ofs > mtd->size) | |
667 | return -EINVAL; | |
668 | ||
669 | for (i = 0; i < concat->num_subdev; i++) { | |
670 | struct mtd_info *subdev = concat->subdev[i]; | |
671 | ||
672 | if (ofs >= subdev->size) { | |
673 | ofs -= subdev->size; | |
674 | continue; | |
675 | } | |
676 | ||
677 | err = subdev->block_markbad(subdev, ofs); | |
f1a28c02 TG |
678 | if (!err) |
679 | mtd->ecc_stats.badblocks++; | |
e8d32937 AB |
680 | break; |
681 | } | |
682 | ||
683 | return err; | |
684 | } | |
685 | ||
6e232cfc DH |
686 | /* |
687 | * try to support NOMMU mmaps on concatenated devices | |
688 | * - we don't support subdev spanning as we can't guarantee it'll work | |
689 | */ | |
690 | static unsigned long concat_get_unmapped_area(struct mtd_info *mtd, | |
691 | unsigned long len, | |
692 | unsigned long offset, | |
693 | unsigned long flags) | |
694 | { | |
695 | struct mtd_concat *concat = CONCAT(mtd); | |
696 | int i; | |
697 | ||
698 | for (i = 0; i < concat->num_subdev; i++) { | |
699 | struct mtd_info *subdev = concat->subdev[i]; | |
700 | ||
701 | if (offset >= subdev->size) { | |
702 | offset -= subdev->size; | |
703 | continue; | |
704 | } | |
705 | ||
706 | /* we've found the subdev over which the mapping will reside */ | |
707 | if (offset + len > subdev->size) | |
708 | return (unsigned long) -EINVAL; | |
709 | ||
710 | if (subdev->get_unmapped_area) | |
711 | return subdev->get_unmapped_area(subdev, len, offset, | |
712 | flags); | |
713 | ||
714 | break; | |
715 | } | |
716 | ||
717 | return (unsigned long) -ENOSYS; | |
718 | } | |
719 | ||
1da177e4 LT |
720 | /* |
721 | * This function constructs a virtual MTD device by concatenating | |
722 | * num_devs MTD devices. A pointer to the new device object is | |
723 | * stored to *new_dev upon success. This function does _not_ | |
724 | * register any devices: this is the caller's responsibility. | |
725 | */ | |
726 | struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to concatenate */ | |
727 | int num_devs, /* number of subdevices */ | |
160bbab3 | 728 | const char *name) |
1da177e4 LT |
729 | { /* name for the new device */ |
730 | int i; | |
731 | size_t size; | |
732 | struct mtd_concat *concat; | |
26cdb67c | 733 | uint32_t max_erasesize, curr_erasesize; |
1da177e4 LT |
734 | int num_erase_region; |
735 | ||
736 | printk(KERN_NOTICE "Concatenating MTD devices:\n"); | |
737 | for (i = 0; i < num_devs; i++) | |
738 | printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name); | |
739 | printk(KERN_NOTICE "into device \"%s\"\n", name); | |
740 | ||
741 | /* allocate the device structure */ | |
742 | size = SIZEOF_STRUCT_MTD_CONCAT(num_devs); | |
95b93a0c | 743 | concat = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
744 | if (!concat) { |
745 | printk | |
746 | ("memory allocation error while creating concatenated device \"%s\"\n", | |
747 | name); | |
748 | return NULL; | |
749 | } | |
1da177e4 LT |
750 | concat->subdev = (struct mtd_info **) (concat + 1); |
751 | ||
752 | /* | |
753 | * Set up the new "super" device's MTD object structure, check for | |
754 | * incompatibilites between the subdevices. | |
755 | */ | |
756 | concat->mtd.type = subdev[0]->type; | |
757 | concat->mtd.flags = subdev[0]->flags; | |
758 | concat->mtd.size = subdev[0]->size; | |
759 | concat->mtd.erasesize = subdev[0]->erasesize; | |
28318776 | 760 | concat->mtd.writesize = subdev[0]->writesize; |
a2e1b833 | 761 | concat->mtd.subpage_sft = subdev[0]->subpage_sft; |
1da177e4 | 762 | concat->mtd.oobsize = subdev[0]->oobsize; |
1f92267c | 763 | concat->mtd.oobavail = subdev[0]->oobavail; |
e8d32937 AB |
764 | if (subdev[0]->writev) |
765 | concat->mtd.writev = concat_writev; | |
1da177e4 LT |
766 | if (subdev[0]->read_oob) |
767 | concat->mtd.read_oob = concat_read_oob; | |
768 | if (subdev[0]->write_oob) | |
769 | concat->mtd.write_oob = concat_write_oob; | |
e8d32937 AB |
770 | if (subdev[0]->block_isbad) |
771 | concat->mtd.block_isbad = concat_block_isbad; | |
772 | if (subdev[0]->block_markbad) | |
773 | concat->mtd.block_markbad = concat_block_markbad; | |
1da177e4 | 774 | |
f1a28c02 TG |
775 | concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks; |
776 | ||
6e232cfc DH |
777 | concat->mtd.backing_dev_info = subdev[0]->backing_dev_info; |
778 | ||
1da177e4 LT |
779 | concat->subdev[0] = subdev[0]; |
780 | ||
781 | for (i = 1; i < num_devs; i++) { | |
782 | if (concat->mtd.type != subdev[i]->type) { | |
783 | kfree(concat); | |
784 | printk("Incompatible device type on \"%s\"\n", | |
785 | subdev[i]->name); | |
786 | return NULL; | |
787 | } | |
788 | if (concat->mtd.flags != subdev[i]->flags) { | |
789 | /* | |
790 | * Expect all flags except MTD_WRITEABLE to be | |
791 | * equal on all subdevices. | |
792 | */ | |
793 | if ((concat->mtd.flags ^ subdev[i]-> | |
794 | flags) & ~MTD_WRITEABLE) { | |
795 | kfree(concat); | |
796 | printk("Incompatible device flags on \"%s\"\n", | |
797 | subdev[i]->name); | |
798 | return NULL; | |
799 | } else | |
800 | /* if writeable attribute differs, | |
801 | make super device writeable */ | |
802 | concat->mtd.flags |= | |
803 | subdev[i]->flags & MTD_WRITEABLE; | |
804 | } | |
6e232cfc DH |
805 | |
806 | /* only permit direct mapping if the BDIs are all the same | |
807 | * - copy-mapping is still permitted | |
808 | */ | |
809 | if (concat->mtd.backing_dev_info != | |
810 | subdev[i]->backing_dev_info) | |
811 | concat->mtd.backing_dev_info = | |
812 | &default_backing_dev_info; | |
813 | ||
1da177e4 | 814 | concat->mtd.size += subdev[i]->size; |
f1a28c02 TG |
815 | concat->mtd.ecc_stats.badblocks += |
816 | subdev[i]->ecc_stats.badblocks; | |
28318776 | 817 | if (concat->mtd.writesize != subdev[i]->writesize || |
29072b96 | 818 | concat->mtd.subpage_sft != subdev[i]->subpage_sft || |
1da177e4 | 819 | concat->mtd.oobsize != subdev[i]->oobsize || |
1da177e4 LT |
820 | !concat->mtd.read_oob != !subdev[i]->read_oob || |
821 | !concat->mtd.write_oob != !subdev[i]->write_oob) { | |
822 | kfree(concat); | |
823 | printk("Incompatible OOB or ECC data on \"%s\"\n", | |
824 | subdev[i]->name); | |
825 | return NULL; | |
826 | } | |
827 | concat->subdev[i] = subdev[i]; | |
828 | ||
829 | } | |
830 | ||
5bd34c09 | 831 | concat->mtd.ecclayout = subdev[0]->ecclayout; |
e8d32937 | 832 | |
1da177e4 LT |
833 | concat->num_subdev = num_devs; |
834 | concat->mtd.name = name; | |
835 | ||
1da177e4 LT |
836 | concat->mtd.erase = concat_erase; |
837 | concat->mtd.read = concat_read; | |
838 | concat->mtd.write = concat_write; | |
839 | concat->mtd.sync = concat_sync; | |
840 | concat->mtd.lock = concat_lock; | |
841 | concat->mtd.unlock = concat_unlock; | |
842 | concat->mtd.suspend = concat_suspend; | |
843 | concat->mtd.resume = concat_resume; | |
6e232cfc | 844 | concat->mtd.get_unmapped_area = concat_get_unmapped_area; |
1da177e4 LT |
845 | |
846 | /* | |
847 | * Combine the erase block size info of the subdevices: | |
848 | * | |
849 | * first, walk the map of the new device and see how | |
850 | * many changes in erase size we have | |
851 | */ | |
852 | max_erasesize = curr_erasesize = subdev[0]->erasesize; | |
853 | num_erase_region = 1; | |
854 | for (i = 0; i < num_devs; i++) { | |
855 | if (subdev[i]->numeraseregions == 0) { | |
856 | /* current subdevice has uniform erase size */ | |
857 | if (subdev[i]->erasesize != curr_erasesize) { | |
858 | /* if it differs from the last subdevice's erase size, count it */ | |
859 | ++num_erase_region; | |
860 | curr_erasesize = subdev[i]->erasesize; | |
861 | if (curr_erasesize > max_erasesize) | |
862 | max_erasesize = curr_erasesize; | |
863 | } | |
864 | } else { | |
865 | /* current subdevice has variable erase size */ | |
866 | int j; | |
867 | for (j = 0; j < subdev[i]->numeraseregions; j++) { | |
868 | ||
869 | /* walk the list of erase regions, count any changes */ | |
870 | if (subdev[i]->eraseregions[j].erasesize != | |
871 | curr_erasesize) { | |
872 | ++num_erase_region; | |
873 | curr_erasesize = | |
874 | subdev[i]->eraseregions[j]. | |
875 | erasesize; | |
876 | if (curr_erasesize > max_erasesize) | |
877 | max_erasesize = curr_erasesize; | |
878 | } | |
879 | } | |
880 | } | |
881 | } | |
882 | ||
883 | if (num_erase_region == 1) { | |
884 | /* | |
885 | * All subdevices have the same uniform erase size. | |
886 | * This is easy: | |
887 | */ | |
888 | concat->mtd.erasesize = curr_erasesize; | |
889 | concat->mtd.numeraseregions = 0; | |
890 | } else { | |
69423d99 AH |
891 | uint64_t tmp64; |
892 | ||
1da177e4 LT |
893 | /* |
894 | * erase block size varies across the subdevices: allocate | |
895 | * space to store the data describing the variable erase regions | |
896 | */ | |
897 | struct mtd_erase_region_info *erase_region_p; | |
69423d99 | 898 | uint64_t begin, position; |
1da177e4 LT |
899 | |
900 | concat->mtd.erasesize = max_erasesize; | |
901 | concat->mtd.numeraseregions = num_erase_region; | |
902 | concat->mtd.eraseregions = erase_region_p = | |
903 | kmalloc(num_erase_region * | |
904 | sizeof (struct mtd_erase_region_info), GFP_KERNEL); | |
905 | if (!erase_region_p) { | |
906 | kfree(concat); | |
907 | printk | |
908 | ("memory allocation error while creating erase region list" | |
909 | " for device \"%s\"\n", name); | |
910 | return NULL; | |
911 | } | |
912 | ||
913 | /* | |
914 | * walk the map of the new device once more and fill in | |
915 | * in erase region info: | |
916 | */ | |
917 | curr_erasesize = subdev[0]->erasesize; | |
918 | begin = position = 0; | |
919 | for (i = 0; i < num_devs; i++) { | |
920 | if (subdev[i]->numeraseregions == 0) { | |
921 | /* current subdevice has uniform erase size */ | |
922 | if (subdev[i]->erasesize != curr_erasesize) { | |
923 | /* | |
924 | * fill in an mtd_erase_region_info structure for the area | |
925 | * we have walked so far: | |
926 | */ | |
927 | erase_region_p->offset = begin; | |
928 | erase_region_p->erasesize = | |
929 | curr_erasesize; | |
69423d99 AH |
930 | tmp64 = position - begin; |
931 | do_div(tmp64, curr_erasesize); | |
932 | erase_region_p->numblocks = tmp64; | |
1da177e4 LT |
933 | begin = position; |
934 | ||
935 | curr_erasesize = subdev[i]->erasesize; | |
936 | ++erase_region_p; | |
937 | } | |
938 | position += subdev[i]->size; | |
939 | } else { | |
940 | /* current subdevice has variable erase size */ | |
941 | int j; | |
942 | for (j = 0; j < subdev[i]->numeraseregions; j++) { | |
943 | /* walk the list of erase regions, count any changes */ | |
944 | if (subdev[i]->eraseregions[j]. | |
945 | erasesize != curr_erasesize) { | |
946 | erase_region_p->offset = begin; | |
947 | erase_region_p->erasesize = | |
948 | curr_erasesize; | |
69423d99 AH |
949 | tmp64 = position - begin; |
950 | do_div(tmp64, curr_erasesize); | |
951 | erase_region_p->numblocks = tmp64; | |
1da177e4 LT |
952 | begin = position; |
953 | ||
954 | curr_erasesize = | |
955 | subdev[i]->eraseregions[j]. | |
956 | erasesize; | |
957 | ++erase_region_p; | |
958 | } | |
959 | position += | |
960 | subdev[i]->eraseregions[j]. | |
69423d99 | 961 | numblocks * (uint64_t)curr_erasesize; |
1da177e4 LT |
962 | } |
963 | } | |
964 | } | |
965 | /* Now write the final entry */ | |
966 | erase_region_p->offset = begin; | |
967 | erase_region_p->erasesize = curr_erasesize; | |
69423d99 AH |
968 | tmp64 = position - begin; |
969 | do_div(tmp64, curr_erasesize); | |
970 | erase_region_p->numblocks = tmp64; | |
1da177e4 LT |
971 | } |
972 | ||
973 | return &concat->mtd; | |
974 | } | |
975 | ||
97894cda | 976 | /* |
1da177e4 LT |
977 | * This function destroys an MTD object obtained from concat_mtd_devs() |
978 | */ | |
979 | ||
980 | void mtd_concat_destroy(struct mtd_info *mtd) | |
981 | { | |
982 | struct mtd_concat *concat = CONCAT(mtd); | |
983 | if (concat->mtd.numeraseregions) | |
984 | kfree(concat->mtd.eraseregions); | |
985 | kfree(concat); | |
986 | } | |
987 | ||
988 | EXPORT_SYMBOL(mtd_concat_create); | |
989 | EXPORT_SYMBOL(mtd_concat_destroy); | |
990 | ||
991 | MODULE_LICENSE("GPL"); | |
992 | MODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>"); | |
993 | MODULE_DESCRIPTION("Generic support for concatenating of MTD devices"); |