Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Simple MTD partitioning layer | |
3 | * | |
a1452a37 DW |
4 | * Copyright © 2000 Nicolas Pitre <nico@fluxnic.net> |
5 | * Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de> | |
6 | * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org> | |
1da177e4 | 7 | * |
a1452a37 DW |
8 | * This program is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 21 | * |
97894cda | 22 | */ |
1da177e4 LT |
23 | |
24 | #include <linux/module.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/list.h> | |
1da177e4 LT |
29 | #include <linux/kmod.h> |
30 | #include <linux/mtd/mtd.h> | |
31 | #include <linux/mtd/partitions.h> | |
5daa7b21 | 32 | #include <linux/err.h> |
1da177e4 | 33 | |
eea72d5f JI |
34 | #include "mtdcore.h" |
35 | ||
1da177e4 LT |
36 | /* Our partition linked list */ |
37 | static LIST_HEAD(mtd_partitions); | |
5daa7b21 | 38 | static DEFINE_MUTEX(mtd_partitions_mutex); |
1da177e4 LT |
39 | |
40 | /* Our partition node structure */ | |
41 | struct mtd_part { | |
42 | struct mtd_info mtd; | |
43 | struct mtd_info *master; | |
69423d99 | 44 | uint64_t offset; |
1da177e4 | 45 | struct list_head list; |
1da177e4 LT |
46 | }; |
47 | ||
48 | /* | |
49 | * Given a pointer to the MTD object in the mtd_part structure, we can retrieve | |
50 | * the pointer to that structure with this macro. | |
51 | */ | |
52 | #define PART(x) ((struct mtd_part *)(x)) | |
53 | ||
97894cda TG |
54 | |
55 | /* | |
1da177e4 LT |
56 | * MTD methods which simply translate the effective address and pass through |
57 | * to the _real_ device. | |
58 | */ | |
59 | ||
b33a2887 AN |
60 | static int part_read(struct mtd_info *mtd, loff_t from, size_t len, |
61 | size_t *retlen, u_char *buf) | |
1da177e4 LT |
62 | { |
63 | struct mtd_part *part = PART(mtd); | |
d8877f19 | 64 | struct mtd_ecc_stats stats; |
f1a28c02 TG |
65 | int res; |
66 | ||
d8877f19 YK |
67 | stats = part->master->ecc_stats; |
68 | ||
1da177e4 LT |
69 | if (from >= mtd->size) |
70 | len = 0; | |
71 | else if (from + len > mtd->size) | |
72 | len = mtd->size - from; | |
b33a2887 | 73 | res = part->master->read(part->master, from + part->offset, |
9223a456 | 74 | len, retlen, buf); |
f1a28c02 TG |
75 | if (unlikely(res)) { |
76 | if (res == -EUCLEAN) | |
d8877f19 | 77 | mtd->ecc_stats.corrected += part->master->ecc_stats.corrected - stats.corrected; |
f1a28c02 | 78 | if (res == -EBADMSG) |
d8877f19 | 79 | mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed; |
f1a28c02 TG |
80 | } |
81 | return res; | |
1da177e4 LT |
82 | } |
83 | ||
b33a2887 AN |
84 | static int part_point(struct mtd_info *mtd, loff_t from, size_t len, |
85 | size_t *retlen, void **virt, resource_size_t *phys) | |
1da177e4 LT |
86 | { |
87 | struct mtd_part *part = PART(mtd); | |
88 | if (from >= mtd->size) | |
89 | len = 0; | |
90 | else if (from + len > mtd->size) | |
91 | len = mtd->size - from; | |
97894cda | 92 | return part->master->point (part->master, from + part->offset, |
a98889f3 | 93 | len, retlen, virt, phys); |
1da177e4 | 94 | } |
9223a456 | 95 | |
a98889f3 | 96 | static void part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) |
1da177e4 LT |
97 | { |
98 | struct mtd_part *part = PART(mtd); | |
99 | ||
a98889f3 | 100 | part->master->unpoint(part->master, from + part->offset, len); |
1da177e4 LT |
101 | } |
102 | ||
402d3265 DH |
103 | static unsigned long part_get_unmapped_area(struct mtd_info *mtd, |
104 | unsigned long len, | |
105 | unsigned long offset, | |
106 | unsigned long flags) | |
107 | { | |
108 | struct mtd_part *part = PART(mtd); | |
109 | ||
110 | offset += part->offset; | |
111 | return part->master->get_unmapped_area(part->master, len, offset, | |
112 | flags); | |
113 | } | |
114 | ||
8593fbc6 | 115 | static int part_read_oob(struct mtd_info *mtd, loff_t from, |
b33a2887 | 116 | struct mtd_oob_ops *ops) |
1da177e4 LT |
117 | { |
118 | struct mtd_part *part = PART(mtd); | |
f1a28c02 | 119 | int res; |
8593fbc6 | 120 | |
1da177e4 | 121 | if (from >= mtd->size) |
8593fbc6 | 122 | return -EINVAL; |
7014568b | 123 | if (ops->datbuf && from + ops->len > mtd->size) |
8593fbc6 | 124 | return -EINVAL; |
f1a28c02 | 125 | |
154bf89f AB |
126 | /* |
127 | * If OOB is also requested, make sure that we do not read past the end | |
128 | * of this partition. | |
129 | */ | |
130 | if (ops->oobbuf) { | |
131 | size_t len, pages; | |
132 | ||
133 | if (ops->mode == MTD_OOB_AUTO) | |
134 | len = mtd->oobavail; | |
135 | else | |
136 | len = mtd->oobsize; | |
137 | pages = mtd_div_by_ws(mtd->size, mtd); | |
138 | pages -= mtd_div_by_ws(from, mtd); | |
139 | if (ops->ooboffs + ops->ooblen > pages * len) | |
140 | return -EINVAL; | |
141 | } | |
142 | ||
143 | res = part->master->read_oob(part->master, from + part->offset, ops); | |
f1a28c02 TG |
144 | if (unlikely(res)) { |
145 | if (res == -EUCLEAN) | |
146 | mtd->ecc_stats.corrected++; | |
147 | if (res == -EBADMSG) | |
148 | mtd->ecc_stats.failed++; | |
149 | } | |
150 | return res; | |
1da177e4 LT |
151 | } |
152 | ||
b33a2887 AN |
153 | static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from, |
154 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
155 | { |
156 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 157 | return part->master->read_user_prot_reg(part->master, from, |
1da177e4 LT |
158 | len, retlen, buf); |
159 | } | |
160 | ||
b33a2887 AN |
161 | static int part_get_user_prot_info(struct mtd_info *mtd, |
162 | struct otp_info *buf, size_t len) | |
f77814dd NP |
163 | { |
164 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 165 | return part->master->get_user_prot_info(part->master, buf, len); |
f77814dd NP |
166 | } |
167 | ||
b33a2887 AN |
168 | static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, |
169 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
170 | { |
171 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 172 | return part->master->read_fact_prot_reg(part->master, from, |
1da177e4 LT |
173 | len, retlen, buf); |
174 | } | |
175 | ||
b33a2887 AN |
176 | static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf, |
177 | size_t len) | |
f77814dd NP |
178 | { |
179 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 180 | return part->master->get_fact_prot_info(part->master, buf, len); |
f77814dd NP |
181 | } |
182 | ||
b33a2887 AN |
183 | static int part_write(struct mtd_info *mtd, loff_t to, size_t len, |
184 | size_t *retlen, const u_char *buf) | |
1da177e4 LT |
185 | { |
186 | struct mtd_part *part = PART(mtd); | |
187 | if (!(mtd->flags & MTD_WRITEABLE)) | |
188 | return -EROFS; | |
189 | if (to >= mtd->size) | |
190 | len = 0; | |
191 | else if (to + len > mtd->size) | |
192 | len = mtd->size - to; | |
b33a2887 | 193 | return part->master->write(part->master, to + part->offset, |
9223a456 | 194 | len, retlen, buf); |
1da177e4 LT |
195 | } |
196 | ||
b33a2887 AN |
197 | static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len, |
198 | size_t *retlen, const u_char *buf) | |
388bbb09 RP |
199 | { |
200 | struct mtd_part *part = PART(mtd); | |
201 | if (!(mtd->flags & MTD_WRITEABLE)) | |
202 | return -EROFS; | |
203 | if (to >= mtd->size) | |
204 | len = 0; | |
205 | else if (to + len > mtd->size) | |
206 | len = mtd->size - to; | |
b33a2887 | 207 | return part->master->panic_write(part->master, to + part->offset, |
388bbb09 RP |
208 | len, retlen, buf); |
209 | } | |
210 | ||
8593fbc6 | 211 | static int part_write_oob(struct mtd_info *mtd, loff_t to, |
b33a2887 | 212 | struct mtd_oob_ops *ops) |
1da177e4 LT |
213 | { |
214 | struct mtd_part *part = PART(mtd); | |
8593fbc6 | 215 | |
1da177e4 LT |
216 | if (!(mtd->flags & MTD_WRITEABLE)) |
217 | return -EROFS; | |
8593fbc6 | 218 | |
1da177e4 | 219 | if (to >= mtd->size) |
8593fbc6 | 220 | return -EINVAL; |
7014568b | 221 | if (ops->datbuf && to + ops->len > mtd->size) |
8593fbc6 TG |
222 | return -EINVAL; |
223 | return part->master->write_oob(part->master, to + part->offset, ops); | |
1da177e4 LT |
224 | } |
225 | ||
b33a2887 AN |
226 | static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from, |
227 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
228 | { |
229 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 230 | return part->master->write_user_prot_reg(part->master, from, |
1da177e4 LT |
231 | len, retlen, buf); |
232 | } | |
233 | ||
b33a2887 AN |
234 | static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, |
235 | size_t len) | |
f77814dd NP |
236 | { |
237 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 238 | return part->master->lock_user_prot_reg(part->master, from, len); |
f77814dd NP |
239 | } |
240 | ||
b33a2887 AN |
241 | static int part_writev(struct mtd_info *mtd, const struct kvec *vecs, |
242 | unsigned long count, loff_t to, size_t *retlen) | |
1da177e4 LT |
243 | { |
244 | struct mtd_part *part = PART(mtd); | |
245 | if (!(mtd->flags & MTD_WRITEABLE)) | |
246 | return -EROFS; | |
b33a2887 | 247 | return part->master->writev(part->master, vecs, count, |
1da177e4 | 248 | to + part->offset, retlen); |
1da177e4 LT |
249 | } |
250 | ||
b33a2887 | 251 | static int part_erase(struct mtd_info *mtd, struct erase_info *instr) |
1da177e4 LT |
252 | { |
253 | struct mtd_part *part = PART(mtd); | |
254 | int ret; | |
255 | if (!(mtd->flags & MTD_WRITEABLE)) | |
256 | return -EROFS; | |
257 | if (instr->addr >= mtd->size) | |
258 | return -EINVAL; | |
259 | instr->addr += part->offset; | |
260 | ret = part->master->erase(part->master, instr); | |
74641d75 | 261 | if (ret) { |
bb0eb217 | 262 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
74641d75 AH |
263 | instr->fail_addr -= part->offset; |
264 | instr->addr -= part->offset; | |
265 | } | |
1da177e4 LT |
266 | return ret; |
267 | } | |
268 | ||
269 | void mtd_erase_callback(struct erase_info *instr) | |
270 | { | |
271 | if (instr->mtd->erase == part_erase) { | |
272 | struct mtd_part *part = PART(instr->mtd); | |
273 | ||
bb0eb217 | 274 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
1da177e4 LT |
275 | instr->fail_addr -= part->offset; |
276 | instr->addr -= part->offset; | |
277 | } | |
278 | if (instr->callback) | |
279 | instr->callback(instr); | |
280 | } | |
281 | EXPORT_SYMBOL_GPL(mtd_erase_callback); | |
282 | ||
69423d99 | 283 | static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 LT |
284 | { |
285 | struct mtd_part *part = PART(mtd); | |
97894cda | 286 | if ((len + ofs) > mtd->size) |
1da177e4 LT |
287 | return -EINVAL; |
288 | return part->master->lock(part->master, ofs + part->offset, len); | |
289 | } | |
290 | ||
69423d99 | 291 | static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 LT |
292 | { |
293 | struct mtd_part *part = PART(mtd); | |
97894cda | 294 | if ((len + ofs) > mtd->size) |
1da177e4 LT |
295 | return -EINVAL; |
296 | return part->master->unlock(part->master, ofs + part->offset, len); | |
297 | } | |
298 | ||
9938424f RC |
299 | static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
300 | { | |
301 | struct mtd_part *part = PART(mtd); | |
302 | if ((len + ofs) > mtd->size) | |
303 | return -EINVAL; | |
304 | return part->master->is_locked(part->master, ofs + part->offset, len); | |
305 | } | |
306 | ||
1da177e4 LT |
307 | static void part_sync(struct mtd_info *mtd) |
308 | { | |
309 | struct mtd_part *part = PART(mtd); | |
310 | part->master->sync(part->master); | |
311 | } | |
312 | ||
313 | static int part_suspend(struct mtd_info *mtd) | |
314 | { | |
315 | struct mtd_part *part = PART(mtd); | |
316 | return part->master->suspend(part->master); | |
317 | } | |
318 | ||
319 | static void part_resume(struct mtd_info *mtd) | |
320 | { | |
321 | struct mtd_part *part = PART(mtd); | |
322 | part->master->resume(part->master); | |
323 | } | |
324 | ||
b33a2887 | 325 | static int part_block_isbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 LT |
326 | { |
327 | struct mtd_part *part = PART(mtd); | |
328 | if (ofs >= mtd->size) | |
329 | return -EINVAL; | |
330 | ofs += part->offset; | |
331 | return part->master->block_isbad(part->master, ofs); | |
332 | } | |
333 | ||
b33a2887 | 334 | static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 LT |
335 | { |
336 | struct mtd_part *part = PART(mtd); | |
f1a28c02 TG |
337 | int res; |
338 | ||
1da177e4 LT |
339 | if (!(mtd->flags & MTD_WRITEABLE)) |
340 | return -EROFS; | |
341 | if (ofs >= mtd->size) | |
342 | return -EINVAL; | |
343 | ofs += part->offset; | |
f1a28c02 TG |
344 | res = part->master->block_markbad(part->master, ofs); |
345 | if (!res) | |
346 | mtd->ecc_stats.badblocks++; | |
347 | return res; | |
1da177e4 LT |
348 | } |
349 | ||
5daa7b21 RT |
350 | static inline void free_partition(struct mtd_part *p) |
351 | { | |
352 | kfree(p->mtd.name); | |
353 | kfree(p); | |
354 | } | |
355 | ||
97894cda TG |
356 | /* |
357 | * This function unregisters and destroy all slave MTD objects which are | |
1da177e4 LT |
358 | * attached to the given master MTD object. |
359 | */ | |
360 | ||
361 | int del_mtd_partitions(struct mtd_info *master) | |
362 | { | |
71a928c0 | 363 | struct mtd_part *slave, *next; |
5daa7b21 | 364 | int ret, err = 0; |
1da177e4 | 365 | |
5daa7b21 | 366 | mutex_lock(&mtd_partitions_mutex); |
71a928c0 | 367 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) |
1da177e4 | 368 | if (slave->master == master) { |
5daa7b21 RT |
369 | ret = del_mtd_device(&slave->mtd); |
370 | if (ret < 0) { | |
371 | err = ret; | |
372 | continue; | |
373 | } | |
71a928c0 | 374 | list_del(&slave->list); |
5daa7b21 | 375 | free_partition(slave); |
1da177e4 | 376 | } |
5daa7b21 | 377 | mutex_unlock(&mtd_partitions_mutex); |
1da177e4 | 378 | |
5daa7b21 | 379 | return err; |
1da177e4 LT |
380 | } |
381 | ||
5daa7b21 RT |
382 | static struct mtd_part *allocate_partition(struct mtd_info *master, |
383 | const struct mtd_partition *part, int partno, | |
384 | uint64_t cur_offset) | |
7788ba71 AN |
385 | { |
386 | struct mtd_part *slave; | |
5daa7b21 | 387 | char *name; |
7788ba71 AN |
388 | |
389 | /* allocate the partition structure */ | |
b33a2887 | 390 | slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
5daa7b21 RT |
391 | name = kstrdup(part->name, GFP_KERNEL); |
392 | if (!name || !slave) { | |
b33a2887 | 393 | printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n", |
5daa7b21 RT |
394 | master->name); |
395 | kfree(name); | |
396 | kfree(slave); | |
397 | return ERR_PTR(-ENOMEM); | |
7788ba71 | 398 | } |
7788ba71 AN |
399 | |
400 | /* set up the MTD object for this partition */ | |
401 | slave->mtd.type = master->type; | |
402 | slave->mtd.flags = master->flags & ~part->mask_flags; | |
403 | slave->mtd.size = part->size; | |
404 | slave->mtd.writesize = master->writesize; | |
7fa33ac0 | 405 | slave->mtd.writebufsize = master->writebufsize; |
7788ba71 AN |
406 | slave->mtd.oobsize = master->oobsize; |
407 | slave->mtd.oobavail = master->oobavail; | |
408 | slave->mtd.subpage_sft = master->subpage_sft; | |
409 | ||
5daa7b21 | 410 | slave->mtd.name = name; |
7788ba71 | 411 | slave->mtd.owner = master->owner; |
402d3265 | 412 | slave->mtd.backing_dev_info = master->backing_dev_info; |
7788ba71 | 413 | |
1f24b5a8 DB |
414 | /* NOTE: we don't arrange MTDs as a tree; it'd be error-prone |
415 | * to have the same data be in two different partitions. | |
416 | */ | |
417 | slave->mtd.dev.parent = master->dev.parent; | |
418 | ||
7788ba71 AN |
419 | slave->mtd.read = part_read; |
420 | slave->mtd.write = part_write; | |
421 | ||
422 | if (master->panic_write) | |
423 | slave->mtd.panic_write = part_panic_write; | |
424 | ||
b33a2887 | 425 | if (master->point && master->unpoint) { |
7788ba71 AN |
426 | slave->mtd.point = part_point; |
427 | slave->mtd.unpoint = part_unpoint; | |
428 | } | |
429 | ||
402d3265 DH |
430 | if (master->get_unmapped_area) |
431 | slave->mtd.get_unmapped_area = part_get_unmapped_area; | |
7788ba71 AN |
432 | if (master->read_oob) |
433 | slave->mtd.read_oob = part_read_oob; | |
434 | if (master->write_oob) | |
435 | slave->mtd.write_oob = part_write_oob; | |
b33a2887 | 436 | if (master->read_user_prot_reg) |
7788ba71 | 437 | slave->mtd.read_user_prot_reg = part_read_user_prot_reg; |
b33a2887 | 438 | if (master->read_fact_prot_reg) |
7788ba71 | 439 | slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg; |
b33a2887 | 440 | if (master->write_user_prot_reg) |
7788ba71 | 441 | slave->mtd.write_user_prot_reg = part_write_user_prot_reg; |
b33a2887 | 442 | if (master->lock_user_prot_reg) |
7788ba71 | 443 | slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg; |
b33a2887 | 444 | if (master->get_user_prot_info) |
7788ba71 | 445 | slave->mtd.get_user_prot_info = part_get_user_prot_info; |
b33a2887 | 446 | if (master->get_fact_prot_info) |
7788ba71 AN |
447 | slave->mtd.get_fact_prot_info = part_get_fact_prot_info; |
448 | if (master->sync) | |
449 | slave->mtd.sync = part_sync; | |
4704a784 | 450 | if (!partno && !master->dev.class && master->suspend && master->resume) { |
7788ba71 AN |
451 | slave->mtd.suspend = part_suspend; |
452 | slave->mtd.resume = part_resume; | |
453 | } | |
454 | if (master->writev) | |
455 | slave->mtd.writev = part_writev; | |
456 | if (master->lock) | |
457 | slave->mtd.lock = part_lock; | |
458 | if (master->unlock) | |
459 | slave->mtd.unlock = part_unlock; | |
9938424f RC |
460 | if (master->is_locked) |
461 | slave->mtd.is_locked = part_is_locked; | |
7788ba71 AN |
462 | if (master->block_isbad) |
463 | slave->mtd.block_isbad = part_block_isbad; | |
464 | if (master->block_markbad) | |
465 | slave->mtd.block_markbad = part_block_markbad; | |
466 | slave->mtd.erase = part_erase; | |
467 | slave->master = master; | |
468 | slave->offset = part->offset; | |
7788ba71 AN |
469 | |
470 | if (slave->offset == MTDPART_OFS_APPEND) | |
471 | slave->offset = cur_offset; | |
472 | if (slave->offset == MTDPART_OFS_NXTBLK) { | |
473 | slave->offset = cur_offset; | |
69423d99 | 474 | if (mtd_mod_by_eb(cur_offset, master) != 0) { |
7788ba71 | 475 | /* Round up to next erasesize */ |
69423d99 | 476 | slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize; |
7788ba71 | 477 | printk(KERN_NOTICE "Moving partition %d: " |
69423d99 AH |
478 | "0x%012llx -> 0x%012llx\n", partno, |
479 | (unsigned long long)cur_offset, (unsigned long long)slave->offset); | |
7788ba71 AN |
480 | } |
481 | } | |
482 | if (slave->mtd.size == MTDPART_SIZ_FULL) | |
483 | slave->mtd.size = master->size - slave->offset; | |
484 | ||
69423d99 AH |
485 | printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset, |
486 | (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name); | |
7788ba71 AN |
487 | |
488 | /* let's do some sanity checks */ | |
489 | if (slave->offset >= master->size) { | |
f636ffb4 | 490 | /* let's register it anyway to preserve ordering */ |
7788ba71 AN |
491 | slave->offset = 0; |
492 | slave->mtd.size = 0; | |
b33a2887 | 493 | printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n", |
7788ba71 | 494 | part->name); |
f636ffb4 | 495 | goto out_register; |
7788ba71 AN |
496 | } |
497 | if (slave->offset + slave->mtd.size > master->size) { | |
498 | slave->mtd.size = master->size - slave->offset; | |
69423d99 AH |
499 | printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n", |
500 | part->name, master->name, (unsigned long long)slave->mtd.size); | |
7788ba71 | 501 | } |
b33a2887 | 502 | if (master->numeraseregions > 1) { |
7788ba71 | 503 | /* Deal with variable erase size stuff */ |
6910c136 | 504 | int i, max = master->numeraseregions; |
69423d99 | 505 | u64 end = slave->offset + slave->mtd.size; |
7788ba71 AN |
506 | struct mtd_erase_region_info *regions = master->eraseregions; |
507 | ||
6910c136 AN |
508 | /* Find the first erase regions which is part of this |
509 | * partition. */ | |
510 | for (i = 0; i < max && regions[i].offset <= slave->offset; i++) | |
7788ba71 | 511 | ; |
6910c136 | 512 | /* The loop searched for the region _behind_ the first one */ |
a57ca046 RK |
513 | if (i > 0) |
514 | i--; | |
7788ba71 | 515 | |
6910c136 AN |
516 | /* Pick biggest erasesize */ |
517 | for (; i < max && regions[i].offset < end; i++) { | |
7788ba71 AN |
518 | if (slave->mtd.erasesize < regions[i].erasesize) { |
519 | slave->mtd.erasesize = regions[i].erasesize; | |
520 | } | |
521 | } | |
6910c136 | 522 | BUG_ON(slave->mtd.erasesize == 0); |
7788ba71 AN |
523 | } else { |
524 | /* Single erase size */ | |
525 | slave->mtd.erasesize = master->erasesize; | |
526 | } | |
527 | ||
528 | if ((slave->mtd.flags & MTD_WRITEABLE) && | |
69423d99 | 529 | mtd_mod_by_eb(slave->offset, &slave->mtd)) { |
7788ba71 | 530 | /* Doesn't start on a boundary of major erase size */ |
b33a2887 AN |
531 | /* FIXME: Let it be writable if it is on a boundary of |
532 | * _minor_ erase size though */ | |
7788ba71 | 533 | slave->mtd.flags &= ~MTD_WRITEABLE; |
b33a2887 | 534 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n", |
7788ba71 AN |
535 | part->name); |
536 | } | |
537 | if ((slave->mtd.flags & MTD_WRITEABLE) && | |
69423d99 | 538 | mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) { |
7788ba71 | 539 | slave->mtd.flags &= ~MTD_WRITEABLE; |
b33a2887 | 540 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n", |
7788ba71 AN |
541 | part->name); |
542 | } | |
543 | ||
544 | slave->mtd.ecclayout = master->ecclayout; | |
545 | if (master->block_isbad) { | |
69423d99 | 546 | uint64_t offs = 0; |
7788ba71 | 547 | |
b33a2887 | 548 | while (offs < slave->mtd.size) { |
7788ba71 AN |
549 | if (master->block_isbad(master, |
550 | offs + slave->offset)) | |
551 | slave->mtd.ecc_stats.badblocks++; | |
552 | offs += slave->mtd.erasesize; | |
553 | } | |
554 | } | |
555 | ||
f636ffb4 | 556 | out_register: |
7788ba71 AN |
557 | return slave; |
558 | } | |
559 | ||
5daa7b21 RT |
560 | int mtd_add_partition(struct mtd_info *master, char *name, |
561 | long long offset, long long length) | |
562 | { | |
563 | struct mtd_partition part; | |
564 | struct mtd_part *p, *new; | |
565 | uint64_t start, end; | |
566 | int ret = 0; | |
567 | ||
568 | /* the direct offset is expected */ | |
569 | if (offset == MTDPART_OFS_APPEND || | |
570 | offset == MTDPART_OFS_NXTBLK) | |
571 | return -EINVAL; | |
572 | ||
573 | if (length == MTDPART_SIZ_FULL) | |
574 | length = master->size - offset; | |
575 | ||
576 | if (length <= 0) | |
577 | return -EINVAL; | |
578 | ||
579 | part.name = name; | |
580 | part.size = length; | |
581 | part.offset = offset; | |
582 | part.mask_flags = 0; | |
583 | part.ecclayout = NULL; | |
584 | ||
585 | new = allocate_partition(master, &part, -1, offset); | |
586 | if (IS_ERR(new)) | |
587 | return PTR_ERR(new); | |
588 | ||
589 | start = offset; | |
590 | end = offset + length; | |
591 | ||
592 | mutex_lock(&mtd_partitions_mutex); | |
593 | list_for_each_entry(p, &mtd_partitions, list) | |
594 | if (p->master == master) { | |
595 | if ((start >= p->offset) && | |
596 | (start < (p->offset + p->mtd.size))) | |
597 | goto err_inv; | |
598 | ||
599 | if ((end >= p->offset) && | |
600 | (end < (p->offset + p->mtd.size))) | |
601 | goto err_inv; | |
602 | } | |
603 | ||
604 | list_add(&new->list, &mtd_partitions); | |
605 | mutex_unlock(&mtd_partitions_mutex); | |
606 | ||
607 | add_mtd_device(&new->mtd); | |
608 | ||
609 | return ret; | |
610 | err_inv: | |
611 | mutex_unlock(&mtd_partitions_mutex); | |
612 | free_partition(new); | |
613 | return -EINVAL; | |
614 | } | |
615 | EXPORT_SYMBOL_GPL(mtd_add_partition); | |
616 | ||
617 | int mtd_del_partition(struct mtd_info *master, int partno) | |
618 | { | |
619 | struct mtd_part *slave, *next; | |
620 | int ret = -EINVAL; | |
621 | ||
622 | mutex_lock(&mtd_partitions_mutex); | |
623 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) | |
624 | if ((slave->master == master) && | |
625 | (slave->mtd.index == partno)) { | |
626 | ret = del_mtd_device(&slave->mtd); | |
627 | if (ret < 0) | |
628 | break; | |
629 | ||
630 | list_del(&slave->list); | |
631 | free_partition(slave); | |
632 | break; | |
633 | } | |
634 | mutex_unlock(&mtd_partitions_mutex); | |
635 | ||
636 | return ret; | |
637 | } | |
638 | EXPORT_SYMBOL_GPL(mtd_del_partition); | |
639 | ||
1da177e4 LT |
640 | /* |
641 | * This function, given a master MTD object and a partition table, creates | |
642 | * and registers slave MTD objects which are bound to the master according to | |
643 | * the partition definitions. | |
1f24b5a8 DB |
644 | * |
645 | * We don't register the master, or expect the caller to have done so, | |
646 | * for reasons of data integrity. | |
1da177e4 LT |
647 | */ |
648 | ||
97894cda | 649 | int add_mtd_partitions(struct mtd_info *master, |
1da177e4 LT |
650 | const struct mtd_partition *parts, |
651 | int nbparts) | |
652 | { | |
653 | struct mtd_part *slave; | |
69423d99 | 654 | uint64_t cur_offset = 0; |
1da177e4 LT |
655 | int i; |
656 | ||
b33a2887 | 657 | printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); |
1da177e4 LT |
658 | |
659 | for (i = 0; i < nbparts; i++) { | |
5daa7b21 RT |
660 | slave = allocate_partition(master, parts + i, i, cur_offset); |
661 | if (IS_ERR(slave)) | |
662 | return PTR_ERR(slave); | |
663 | ||
664 | mutex_lock(&mtd_partitions_mutex); | |
665 | list_add(&slave->list, &mtd_partitions); | |
666 | mutex_unlock(&mtd_partitions_mutex); | |
667 | ||
668 | add_mtd_device(&slave->mtd); | |
669 | ||
1da177e4 | 670 | cur_offset = slave->offset + slave->mtd.size; |
1da177e4 LT |
671 | } |
672 | ||
673 | return 0; | |
674 | } | |
1da177e4 LT |
675 | |
676 | static DEFINE_SPINLOCK(part_parser_lock); | |
677 | static LIST_HEAD(part_parsers); | |
678 | ||
679 | static struct mtd_part_parser *get_partition_parser(const char *name) | |
680 | { | |
71a928c0 | 681 | struct mtd_part_parser *p, *ret = NULL; |
1da177e4 | 682 | |
71a928c0 | 683 | spin_lock(&part_parser_lock); |
1da177e4 | 684 | |
71a928c0 | 685 | list_for_each_entry(p, &part_parsers, list) |
1da177e4 LT |
686 | if (!strcmp(p->name, name) && try_module_get(p->owner)) { |
687 | ret = p; | |
688 | break; | |
689 | } | |
71a928c0 | 690 | |
1da177e4 LT |
691 | spin_unlock(&part_parser_lock); |
692 | ||
693 | return ret; | |
694 | } | |
695 | ||
696 | int register_mtd_parser(struct mtd_part_parser *p) | |
697 | { | |
698 | spin_lock(&part_parser_lock); | |
699 | list_add(&p->list, &part_parsers); | |
700 | spin_unlock(&part_parser_lock); | |
701 | ||
702 | return 0; | |
703 | } | |
b33a2887 | 704 | EXPORT_SYMBOL_GPL(register_mtd_parser); |
1da177e4 LT |
705 | |
706 | int deregister_mtd_parser(struct mtd_part_parser *p) | |
707 | { | |
708 | spin_lock(&part_parser_lock); | |
709 | list_del(&p->list); | |
710 | spin_unlock(&part_parser_lock); | |
711 | return 0; | |
712 | } | |
b33a2887 | 713 | EXPORT_SYMBOL_GPL(deregister_mtd_parser); |
1da177e4 | 714 | |
97894cda | 715 | int parse_mtd_partitions(struct mtd_info *master, const char **types, |
1da177e4 LT |
716 | struct mtd_partition **pparts, unsigned long origin) |
717 | { | |
718 | struct mtd_part_parser *parser; | |
719 | int ret = 0; | |
97894cda | 720 | |
1da177e4 LT |
721 | for ( ; ret <= 0 && *types; types++) { |
722 | parser = get_partition_parser(*types); | |
1da177e4 LT |
723 | if (!parser && !request_module("%s", *types)) |
724 | parser = get_partition_parser(*types); | |
7c802fbd | 725 | if (!parser) |
1da177e4 | 726 | continue; |
1da177e4 LT |
727 | ret = (*parser->parse_fn)(master, pparts, origin); |
728 | if (ret > 0) { | |
97894cda | 729 | printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n", |
1da177e4 LT |
730 | ret, parser->name, master->name); |
731 | } | |
732 | put_partition_parser(parser); | |
733 | } | |
734 | return ret; | |
735 | } | |
1da177e4 | 736 | EXPORT_SYMBOL_GPL(parse_mtd_partitions); |
5daa7b21 | 737 | |
a7e93dcd | 738 | int mtd_is_partition(struct mtd_info *mtd) |
5daa7b21 RT |
739 | { |
740 | struct mtd_part *part; | |
a7e93dcd | 741 | int ispart = 0; |
5daa7b21 RT |
742 | |
743 | mutex_lock(&mtd_partitions_mutex); | |
744 | list_for_each_entry(part, &mtd_partitions, list) | |
745 | if (&part->mtd == mtd) { | |
a7e93dcd | 746 | ispart = 1; |
5daa7b21 RT |
747 | break; |
748 | } | |
749 | mutex_unlock(&mtd_partitions_mutex); | |
750 | ||
a7e93dcd | 751 | return ispart; |
5daa7b21 | 752 | } |
a7e93dcd | 753 | EXPORT_SYMBOL_GPL(mtd_is_partition); |