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Commit | Line | Data |
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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> |
727dc612 | 33 | #include <linux/kconfig.h> |
1da177e4 | 34 | |
eea72d5f JI |
35 | #include "mtdcore.h" |
36 | ||
1da177e4 LT |
37 | /* Our partition linked list */ |
38 | static LIST_HEAD(mtd_partitions); | |
5daa7b21 | 39 | static DEFINE_MUTEX(mtd_partitions_mutex); |
1da177e4 LT |
40 | |
41 | /* Our partition node structure */ | |
42 | struct mtd_part { | |
43 | struct mtd_info mtd; | |
44 | struct mtd_info *master; | |
69423d99 | 45 | uint64_t offset; |
1da177e4 | 46 | struct list_head list; |
1da177e4 LT |
47 | }; |
48 | ||
49 | /* | |
50 | * Given a pointer to the MTD object in the mtd_part structure, we can retrieve | |
2524534d | 51 | * the pointer to that structure. |
1da177e4 | 52 | */ |
2524534d BN |
53 | static inline struct mtd_part *mtd_to_part(const struct mtd_info *mtd) |
54 | { | |
55 | return container_of(mtd, struct mtd_part, mtd); | |
56 | } | |
1da177e4 | 57 | |
97894cda TG |
58 | |
59 | /* | |
1da177e4 LT |
60 | * MTD methods which simply translate the effective address and pass through |
61 | * to the _real_ device. | |
62 | */ | |
63 | ||
b33a2887 AN |
64 | static int part_read(struct mtd_info *mtd, loff_t from, size_t len, |
65 | size_t *retlen, u_char *buf) | |
1da177e4 | 66 | { |
2524534d | 67 | struct mtd_part *part = mtd_to_part(mtd); |
d8877f19 | 68 | struct mtd_ecc_stats stats; |
f1a28c02 TG |
69 | int res; |
70 | ||
d8877f19 | 71 | stats = part->master->ecc_stats; |
994c8409 MD |
72 | res = part->master->_read(part->master, from + part->offset, len, |
73 | retlen, buf); | |
edbc4540 MD |
74 | if (unlikely(mtd_is_eccerr(res))) |
75 | mtd->ecc_stats.failed += | |
76 | part->master->ecc_stats.failed - stats.failed; | |
77 | else | |
78 | mtd->ecc_stats.corrected += | |
79 | part->master->ecc_stats.corrected - stats.corrected; | |
f1a28c02 | 80 | return res; |
1da177e4 LT |
81 | } |
82 | ||
b33a2887 AN |
83 | static int part_point(struct mtd_info *mtd, loff_t from, size_t len, |
84 | size_t *retlen, void **virt, resource_size_t *phys) | |
1da177e4 | 85 | { |
2524534d | 86 | struct mtd_part *part = mtd_to_part(mtd); |
5def4898 | 87 | |
994c8409 MD |
88 | return part->master->_point(part->master, from + part->offset, len, |
89 | retlen, virt, phys); | |
1da177e4 | 90 | } |
9223a456 | 91 | |
5e4e6e3f | 92 | static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) |
1da177e4 | 93 | { |
2524534d | 94 | struct mtd_part *part = mtd_to_part(mtd); |
1da177e4 | 95 | |
994c8409 | 96 | return part->master->_unpoint(part->master, from + part->offset, len); |
1da177e4 LT |
97 | } |
98 | ||
402d3265 DH |
99 | static unsigned long part_get_unmapped_area(struct mtd_info *mtd, |
100 | unsigned long len, | |
101 | unsigned long offset, | |
102 | unsigned long flags) | |
103 | { | |
2524534d | 104 | struct mtd_part *part = mtd_to_part(mtd); |
402d3265 DH |
105 | |
106 | offset += part->offset; | |
994c8409 MD |
107 | return part->master->_get_unmapped_area(part->master, len, offset, |
108 | flags); | |
402d3265 DH |
109 | } |
110 | ||
8593fbc6 | 111 | static int part_read_oob(struct mtd_info *mtd, loff_t from, |
b33a2887 | 112 | struct mtd_oob_ops *ops) |
1da177e4 | 113 | { |
2524534d | 114 | struct mtd_part *part = mtd_to_part(mtd); |
f1a28c02 | 115 | int res; |
8593fbc6 | 116 | |
1da177e4 | 117 | if (from >= mtd->size) |
8593fbc6 | 118 | return -EINVAL; |
7014568b | 119 | if (ops->datbuf && from + ops->len > mtd->size) |
8593fbc6 | 120 | return -EINVAL; |
f1a28c02 | 121 | |
154bf89f AB |
122 | /* |
123 | * If OOB is also requested, make sure that we do not read past the end | |
124 | * of this partition. | |
125 | */ | |
126 | if (ops->oobbuf) { | |
127 | size_t len, pages; | |
128 | ||
29f1058a | 129 | len = mtd_oobavail(mtd, ops); |
154bf89f AB |
130 | pages = mtd_div_by_ws(mtd->size, mtd); |
131 | pages -= mtd_div_by_ws(from, mtd); | |
132 | if (ops->ooboffs + ops->ooblen > pages * len) | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
994c8409 | 136 | res = part->master->_read_oob(part->master, from + part->offset, ops); |
f1a28c02 | 137 | if (unlikely(res)) { |
d57f4054 | 138 | if (mtd_is_bitflip(res)) |
f1a28c02 | 139 | mtd->ecc_stats.corrected++; |
d57f4054 | 140 | if (mtd_is_eccerr(res)) |
f1a28c02 TG |
141 | mtd->ecc_stats.failed++; |
142 | } | |
143 | return res; | |
1da177e4 LT |
144 | } |
145 | ||
b33a2887 AN |
146 | static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from, |
147 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 | 148 | { |
2524534d | 149 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
150 | return part->master->_read_user_prot_reg(part->master, from, len, |
151 | retlen, buf); | |
1da177e4 LT |
152 | } |
153 | ||
4b78fc42 CR |
154 | static int part_get_user_prot_info(struct mtd_info *mtd, size_t len, |
155 | size_t *retlen, struct otp_info *buf) | |
f77814dd | 156 | { |
2524534d | 157 | struct mtd_part *part = mtd_to_part(mtd); |
4b78fc42 CR |
158 | return part->master->_get_user_prot_info(part->master, len, retlen, |
159 | buf); | |
f77814dd NP |
160 | } |
161 | ||
b33a2887 AN |
162 | static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, |
163 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 | 164 | { |
2524534d | 165 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
166 | return part->master->_read_fact_prot_reg(part->master, from, len, |
167 | retlen, buf); | |
1da177e4 LT |
168 | } |
169 | ||
4b78fc42 CR |
170 | static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len, |
171 | size_t *retlen, struct otp_info *buf) | |
f77814dd | 172 | { |
2524534d | 173 | struct mtd_part *part = mtd_to_part(mtd); |
4b78fc42 CR |
174 | return part->master->_get_fact_prot_info(part->master, len, retlen, |
175 | buf); | |
f77814dd NP |
176 | } |
177 | ||
b33a2887 AN |
178 | static int part_write(struct mtd_info *mtd, loff_t to, size_t len, |
179 | size_t *retlen, const u_char *buf) | |
1da177e4 | 180 | { |
2524534d | 181 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
182 | return part->master->_write(part->master, to + part->offset, len, |
183 | retlen, buf); | |
1da177e4 LT |
184 | } |
185 | ||
b33a2887 AN |
186 | static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len, |
187 | size_t *retlen, const u_char *buf) | |
388bbb09 | 188 | { |
2524534d | 189 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
190 | return part->master->_panic_write(part->master, to + part->offset, len, |
191 | retlen, buf); | |
388bbb09 RP |
192 | } |
193 | ||
8593fbc6 | 194 | static int part_write_oob(struct mtd_info *mtd, loff_t to, |
b33a2887 | 195 | struct mtd_oob_ops *ops) |
1da177e4 | 196 | { |
2524534d | 197 | struct mtd_part *part = mtd_to_part(mtd); |
8593fbc6 | 198 | |
1da177e4 | 199 | if (to >= mtd->size) |
8593fbc6 | 200 | return -EINVAL; |
7014568b | 201 | if (ops->datbuf && to + ops->len > mtd->size) |
8593fbc6 | 202 | return -EINVAL; |
994c8409 | 203 | return part->master->_write_oob(part->master, to + part->offset, ops); |
1da177e4 LT |
204 | } |
205 | ||
b33a2887 AN |
206 | static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from, |
207 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 | 208 | { |
2524534d | 209 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
210 | return part->master->_write_user_prot_reg(part->master, from, len, |
211 | retlen, buf); | |
1da177e4 LT |
212 | } |
213 | ||
b33a2887 AN |
214 | static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, |
215 | size_t len) | |
f77814dd | 216 | { |
2524534d | 217 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 218 | return part->master->_lock_user_prot_reg(part->master, from, len); |
f77814dd NP |
219 | } |
220 | ||
b33a2887 AN |
221 | static int part_writev(struct mtd_info *mtd, const struct kvec *vecs, |
222 | unsigned long count, loff_t to, size_t *retlen) | |
1da177e4 | 223 | { |
2524534d | 224 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
225 | return part->master->_writev(part->master, vecs, count, |
226 | to + part->offset, retlen); | |
1da177e4 LT |
227 | } |
228 | ||
b33a2887 | 229 | static int part_erase(struct mtd_info *mtd, struct erase_info *instr) |
1da177e4 | 230 | { |
2524534d | 231 | struct mtd_part *part = mtd_to_part(mtd); |
1da177e4 | 232 | int ret; |
664addc2 | 233 | |
1da177e4 | 234 | instr->addr += part->offset; |
994c8409 | 235 | ret = part->master->_erase(part->master, instr); |
74641d75 | 236 | if (ret) { |
bb0eb217 | 237 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
74641d75 AH |
238 | instr->fail_addr -= part->offset; |
239 | instr->addr -= part->offset; | |
240 | } | |
1da177e4 LT |
241 | return ret; |
242 | } | |
243 | ||
244 | void mtd_erase_callback(struct erase_info *instr) | |
245 | { | |
3c3c10bb | 246 | if (instr->mtd->_erase == part_erase) { |
2524534d | 247 | struct mtd_part *part = mtd_to_part(instr->mtd); |
1da177e4 | 248 | |
bb0eb217 | 249 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
1da177e4 LT |
250 | instr->fail_addr -= part->offset; |
251 | instr->addr -= part->offset; | |
252 | } | |
253 | if (instr->callback) | |
254 | instr->callback(instr); | |
255 | } | |
256 | EXPORT_SYMBOL_GPL(mtd_erase_callback); | |
257 | ||
69423d99 | 258 | static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 | 259 | { |
2524534d | 260 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 261 | return part->master->_lock(part->master, ofs + part->offset, len); |
1da177e4 LT |
262 | } |
263 | ||
69423d99 | 264 | static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 | 265 | { |
2524534d | 266 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 267 | return part->master->_unlock(part->master, ofs + part->offset, len); |
1da177e4 LT |
268 | } |
269 | ||
9938424f RC |
270 | static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
271 | { | |
2524534d | 272 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 273 | return part->master->_is_locked(part->master, ofs + part->offset, len); |
9938424f RC |
274 | } |
275 | ||
1da177e4 LT |
276 | static void part_sync(struct mtd_info *mtd) |
277 | { | |
2524534d | 278 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 279 | part->master->_sync(part->master); |
1da177e4 LT |
280 | } |
281 | ||
282 | static int part_suspend(struct mtd_info *mtd) | |
283 | { | |
2524534d | 284 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 285 | return part->master->_suspend(part->master); |
1da177e4 LT |
286 | } |
287 | ||
288 | static void part_resume(struct mtd_info *mtd) | |
289 | { | |
2524534d | 290 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 291 | part->master->_resume(part->master); |
1da177e4 LT |
292 | } |
293 | ||
8471bb73 EG |
294 | static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs) |
295 | { | |
2524534d | 296 | struct mtd_part *part = mtd_to_part(mtd); |
8471bb73 EG |
297 | ofs += part->offset; |
298 | return part->master->_block_isreserved(part->master, ofs); | |
299 | } | |
300 | ||
b33a2887 | 301 | static int part_block_isbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 | 302 | { |
2524534d | 303 | struct mtd_part *part = mtd_to_part(mtd); |
1da177e4 | 304 | ofs += part->offset; |
994c8409 | 305 | return part->master->_block_isbad(part->master, ofs); |
1da177e4 LT |
306 | } |
307 | ||
b33a2887 | 308 | static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 | 309 | { |
2524534d | 310 | struct mtd_part *part = mtd_to_part(mtd); |
f1a28c02 TG |
311 | int res; |
312 | ||
1da177e4 | 313 | ofs += part->offset; |
994c8409 | 314 | res = part->master->_block_markbad(part->master, ofs); |
f1a28c02 TG |
315 | if (!res) |
316 | mtd->ecc_stats.badblocks++; | |
317 | return res; | |
1da177e4 LT |
318 | } |
319 | ||
5e149073 RW |
320 | static int part_get_device(struct mtd_info *mtd) |
321 | { | |
322 | struct mtd_part *part = mtd_to_part(mtd); | |
323 | return part->master->_get_device(part->master); | |
324 | } | |
325 | ||
326 | static void part_put_device(struct mtd_info *mtd) | |
327 | { | |
328 | struct mtd_part *part = mtd_to_part(mtd); | |
329 | part->master->_put_device(part->master); | |
330 | } | |
331 | ||
adbbc3bc BB |
332 | static int part_ooblayout_ecc(struct mtd_info *mtd, int section, |
333 | struct mtd_oob_region *oobregion) | |
334 | { | |
335 | struct mtd_part *part = mtd_to_part(mtd); | |
336 | ||
337 | return mtd_ooblayout_ecc(part->master, section, oobregion); | |
338 | } | |
339 | ||
340 | static int part_ooblayout_free(struct mtd_info *mtd, int section, | |
341 | struct mtd_oob_region *oobregion) | |
342 | { | |
343 | struct mtd_part *part = mtd_to_part(mtd); | |
344 | ||
345 | return mtd_ooblayout_free(part->master, section, oobregion); | |
346 | } | |
347 | ||
348 | static const struct mtd_ooblayout_ops part_ooblayout_ops = { | |
349 | .ecc = part_ooblayout_ecc, | |
350 | .free = part_ooblayout_free, | |
351 | }; | |
352 | ||
5daa7b21 RT |
353 | static inline void free_partition(struct mtd_part *p) |
354 | { | |
355 | kfree(p->mtd.name); | |
356 | kfree(p); | |
357 | } | |
358 | ||
97894cda TG |
359 | /* |
360 | * This function unregisters and destroy all slave MTD objects which are | |
1da177e4 LT |
361 | * attached to the given master MTD object. |
362 | */ | |
363 | ||
364 | int del_mtd_partitions(struct mtd_info *master) | |
365 | { | |
71a928c0 | 366 | struct mtd_part *slave, *next; |
5daa7b21 | 367 | int ret, err = 0; |
1da177e4 | 368 | |
5daa7b21 | 369 | mutex_lock(&mtd_partitions_mutex); |
71a928c0 | 370 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) |
1da177e4 | 371 | if (slave->master == master) { |
5daa7b21 RT |
372 | ret = del_mtd_device(&slave->mtd); |
373 | if (ret < 0) { | |
374 | err = ret; | |
375 | continue; | |
376 | } | |
71a928c0 | 377 | list_del(&slave->list); |
5daa7b21 | 378 | free_partition(slave); |
1da177e4 | 379 | } |
5daa7b21 | 380 | mutex_unlock(&mtd_partitions_mutex); |
1da177e4 | 381 | |
5daa7b21 | 382 | return err; |
1da177e4 LT |
383 | } |
384 | ||
5daa7b21 RT |
385 | static struct mtd_part *allocate_partition(struct mtd_info *master, |
386 | const struct mtd_partition *part, int partno, | |
387 | uint64_t cur_offset) | |
7788ba71 AN |
388 | { |
389 | struct mtd_part *slave; | |
5daa7b21 | 390 | char *name; |
7788ba71 AN |
391 | |
392 | /* allocate the partition structure */ | |
b33a2887 | 393 | slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
5daa7b21 RT |
394 | name = kstrdup(part->name, GFP_KERNEL); |
395 | if (!name || !slave) { | |
b33a2887 | 396 | printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n", |
5daa7b21 RT |
397 | master->name); |
398 | kfree(name); | |
399 | kfree(slave); | |
400 | return ERR_PTR(-ENOMEM); | |
7788ba71 | 401 | } |
7788ba71 AN |
402 | |
403 | /* set up the MTD object for this partition */ | |
404 | slave->mtd.type = master->type; | |
405 | slave->mtd.flags = master->flags & ~part->mask_flags; | |
406 | slave->mtd.size = part->size; | |
407 | slave->mtd.writesize = master->writesize; | |
7fa33ac0 | 408 | slave->mtd.writebufsize = master->writebufsize; |
7788ba71 AN |
409 | slave->mtd.oobsize = master->oobsize; |
410 | slave->mtd.oobavail = master->oobavail; | |
411 | slave->mtd.subpage_sft = master->subpage_sft; | |
477b0229 | 412 | slave->mtd.pairing = master->pairing; |
7788ba71 | 413 | |
5daa7b21 | 414 | slave->mtd.name = name; |
7788ba71 AN |
415 | slave->mtd.owner = master->owner; |
416 | ||
727dc612 DE |
417 | /* NOTE: Historically, we didn't arrange MTDs as a tree out of |
418 | * concern for showing the same data in multiple partitions. | |
419 | * However, it is very useful to have the master node present, | |
420 | * so the MTD_PARTITIONED_MASTER option allows that. The master | |
421 | * will have device nodes etc only if this is set, so make the | |
422 | * parent conditional on that option. Note, this is a way to | |
423 | * distinguish between the master and the partition in sysfs. | |
1f24b5a8 | 424 | */ |
727dc612 DE |
425 | slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) ? |
426 | &master->dev : | |
427 | master->dev.parent; | |
1f24b5a8 | 428 | |
3c3c10bb AB |
429 | slave->mtd._read = part_read; |
430 | slave->mtd._write = part_write; | |
7788ba71 | 431 | |
3c3c10bb AB |
432 | if (master->_panic_write) |
433 | slave->mtd._panic_write = part_panic_write; | |
7788ba71 | 434 | |
3c3c10bb AB |
435 | if (master->_point && master->_unpoint) { |
436 | slave->mtd._point = part_point; | |
437 | slave->mtd._unpoint = part_unpoint; | |
7788ba71 AN |
438 | } |
439 | ||
3c3c10bb AB |
440 | if (master->_get_unmapped_area) |
441 | slave->mtd._get_unmapped_area = part_get_unmapped_area; | |
442 | if (master->_read_oob) | |
443 | slave->mtd._read_oob = part_read_oob; | |
444 | if (master->_write_oob) | |
445 | slave->mtd._write_oob = part_write_oob; | |
446 | if (master->_read_user_prot_reg) | |
447 | slave->mtd._read_user_prot_reg = part_read_user_prot_reg; | |
448 | if (master->_read_fact_prot_reg) | |
449 | slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg; | |
450 | if (master->_write_user_prot_reg) | |
451 | slave->mtd._write_user_prot_reg = part_write_user_prot_reg; | |
452 | if (master->_lock_user_prot_reg) | |
453 | slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg; | |
454 | if (master->_get_user_prot_info) | |
455 | slave->mtd._get_user_prot_info = part_get_user_prot_info; | |
456 | if (master->_get_fact_prot_info) | |
457 | slave->mtd._get_fact_prot_info = part_get_fact_prot_info; | |
458 | if (master->_sync) | |
459 | slave->mtd._sync = part_sync; | |
460 | if (!partno && !master->dev.class && master->_suspend && | |
461 | master->_resume) { | |
462 | slave->mtd._suspend = part_suspend; | |
463 | slave->mtd._resume = part_resume; | |
7788ba71 | 464 | } |
3c3c10bb AB |
465 | if (master->_writev) |
466 | slave->mtd._writev = part_writev; | |
467 | if (master->_lock) | |
468 | slave->mtd._lock = part_lock; | |
469 | if (master->_unlock) | |
470 | slave->mtd._unlock = part_unlock; | |
471 | if (master->_is_locked) | |
472 | slave->mtd._is_locked = part_is_locked; | |
8471bb73 EG |
473 | if (master->_block_isreserved) |
474 | slave->mtd._block_isreserved = part_block_isreserved; | |
3c3c10bb AB |
475 | if (master->_block_isbad) |
476 | slave->mtd._block_isbad = part_block_isbad; | |
477 | if (master->_block_markbad) | |
478 | slave->mtd._block_markbad = part_block_markbad; | |
5e149073 RW |
479 | |
480 | if (master->_get_device) | |
481 | slave->mtd._get_device = part_get_device; | |
482 | if (master->_put_device) | |
483 | slave->mtd._put_device = part_put_device; | |
484 | ||
3c3c10bb | 485 | slave->mtd._erase = part_erase; |
7788ba71 AN |
486 | slave->master = master; |
487 | slave->offset = part->offset; | |
7788ba71 AN |
488 | |
489 | if (slave->offset == MTDPART_OFS_APPEND) | |
490 | slave->offset = cur_offset; | |
491 | if (slave->offset == MTDPART_OFS_NXTBLK) { | |
492 | slave->offset = cur_offset; | |
69423d99 | 493 | if (mtd_mod_by_eb(cur_offset, master) != 0) { |
7788ba71 | 494 | /* Round up to next erasesize */ |
69423d99 | 495 | slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize; |
7788ba71 | 496 | printk(KERN_NOTICE "Moving partition %d: " |
69423d99 AH |
497 | "0x%012llx -> 0x%012llx\n", partno, |
498 | (unsigned long long)cur_offset, (unsigned long long)slave->offset); | |
7788ba71 AN |
499 | } |
500 | } | |
1a31368b DES |
501 | if (slave->offset == MTDPART_OFS_RETAIN) { |
502 | slave->offset = cur_offset; | |
503 | if (master->size - slave->offset >= slave->mtd.size) { | |
504 | slave->mtd.size = master->size - slave->offset | |
505 | - slave->mtd.size; | |
506 | } else { | |
507 | printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n", | |
508 | part->name, master->size - slave->offset, | |
509 | slave->mtd.size); | |
510 | /* register to preserve ordering */ | |
511 | goto out_register; | |
512 | } | |
513 | } | |
7788ba71 AN |
514 | if (slave->mtd.size == MTDPART_SIZ_FULL) |
515 | slave->mtd.size = master->size - slave->offset; | |
516 | ||
69423d99 AH |
517 | printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset, |
518 | (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name); | |
7788ba71 AN |
519 | |
520 | /* let's do some sanity checks */ | |
521 | if (slave->offset >= master->size) { | |
f636ffb4 | 522 | /* let's register it anyway to preserve ordering */ |
7788ba71 AN |
523 | slave->offset = 0; |
524 | slave->mtd.size = 0; | |
b33a2887 | 525 | printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n", |
7788ba71 | 526 | part->name); |
f636ffb4 | 527 | goto out_register; |
7788ba71 AN |
528 | } |
529 | if (slave->offset + slave->mtd.size > master->size) { | |
530 | slave->mtd.size = master->size - slave->offset; | |
69423d99 AH |
531 | printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n", |
532 | part->name, master->name, (unsigned long long)slave->mtd.size); | |
7788ba71 | 533 | } |
b33a2887 | 534 | if (master->numeraseregions > 1) { |
7788ba71 | 535 | /* Deal with variable erase size stuff */ |
6910c136 | 536 | int i, max = master->numeraseregions; |
69423d99 | 537 | u64 end = slave->offset + slave->mtd.size; |
7788ba71 AN |
538 | struct mtd_erase_region_info *regions = master->eraseregions; |
539 | ||
6910c136 AN |
540 | /* Find the first erase regions which is part of this |
541 | * partition. */ | |
542 | for (i = 0; i < max && regions[i].offset <= slave->offset; i++) | |
7788ba71 | 543 | ; |
6910c136 | 544 | /* The loop searched for the region _behind_ the first one */ |
a57ca046 RK |
545 | if (i > 0) |
546 | i--; | |
7788ba71 | 547 | |
6910c136 AN |
548 | /* Pick biggest erasesize */ |
549 | for (; i < max && regions[i].offset < end; i++) { | |
7788ba71 AN |
550 | if (slave->mtd.erasesize < regions[i].erasesize) { |
551 | slave->mtd.erasesize = regions[i].erasesize; | |
552 | } | |
553 | } | |
6910c136 | 554 | BUG_ON(slave->mtd.erasesize == 0); |
7788ba71 AN |
555 | } else { |
556 | /* Single erase size */ | |
557 | slave->mtd.erasesize = master->erasesize; | |
558 | } | |
559 | ||
560 | if ((slave->mtd.flags & MTD_WRITEABLE) && | |
69423d99 | 561 | mtd_mod_by_eb(slave->offset, &slave->mtd)) { |
7788ba71 | 562 | /* Doesn't start on a boundary of major erase size */ |
b33a2887 AN |
563 | /* FIXME: Let it be writable if it is on a boundary of |
564 | * _minor_ erase size though */ | |
7788ba71 | 565 | slave->mtd.flags &= ~MTD_WRITEABLE; |
b33a2887 | 566 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n", |
7788ba71 AN |
567 | part->name); |
568 | } | |
569 | if ((slave->mtd.flags & MTD_WRITEABLE) && | |
69423d99 | 570 | mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) { |
7788ba71 | 571 | slave->mtd.flags &= ~MTD_WRITEABLE; |
b33a2887 | 572 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n", |
7788ba71 AN |
573 | part->name); |
574 | } | |
575 | ||
adbbc3bc | 576 | mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops); |
bdf69c47 | 577 | slave->mtd.ecc_step_size = master->ecc_step_size; |
6a918bad | 578 | slave->mtd.ecc_strength = master->ecc_strength; |
d062d4ed MD |
579 | slave->mtd.bitflip_threshold = master->bitflip_threshold; |
580 | ||
3c3c10bb | 581 | if (master->_block_isbad) { |
69423d99 | 582 | uint64_t offs = 0; |
7788ba71 | 583 | |
b33a2887 | 584 | while (offs < slave->mtd.size) { |
fdf43a42 EG |
585 | if (mtd_block_isreserved(master, offs + slave->offset)) |
586 | slave->mtd.ecc_stats.bbtblocks++; | |
587 | else if (mtd_block_isbad(master, offs + slave->offset)) | |
7788ba71 AN |
588 | slave->mtd.ecc_stats.badblocks++; |
589 | offs += slave->mtd.erasesize; | |
590 | } | |
591 | } | |
592 | ||
f636ffb4 | 593 | out_register: |
7788ba71 AN |
594 | return slave; |
595 | } | |
596 | ||
a62c24d7 DE |
597 | static ssize_t mtd_partition_offset_show(struct device *dev, |
598 | struct device_attribute *attr, char *buf) | |
599 | { | |
600 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
2524534d | 601 | struct mtd_part *part = mtd_to_part(mtd); |
a62c24d7 DE |
602 | return snprintf(buf, PAGE_SIZE, "%lld\n", part->offset); |
603 | } | |
604 | ||
605 | static DEVICE_ATTR(offset, S_IRUGO, mtd_partition_offset_show, NULL); | |
606 | ||
607 | static const struct attribute *mtd_partition_attrs[] = { | |
608 | &dev_attr_offset.attr, | |
609 | NULL | |
610 | }; | |
611 | ||
612 | static int mtd_add_partition_attrs(struct mtd_part *new) | |
613 | { | |
614 | int ret = sysfs_create_files(&new->mtd.dev.kobj, mtd_partition_attrs); | |
615 | if (ret) | |
616 | printk(KERN_WARNING | |
617 | "mtd: failed to create partition attrs, err=%d\n", ret); | |
618 | return ret; | |
619 | } | |
620 | ||
26a6d240 | 621 | int mtd_add_partition(struct mtd_info *master, const char *name, |
5daa7b21 RT |
622 | long long offset, long long length) |
623 | { | |
624 | struct mtd_partition part; | |
3a434f66 | 625 | struct mtd_part *new; |
5daa7b21 RT |
626 | int ret = 0; |
627 | ||
628 | /* the direct offset is expected */ | |
629 | if (offset == MTDPART_OFS_APPEND || | |
630 | offset == MTDPART_OFS_NXTBLK) | |
631 | return -EINVAL; | |
632 | ||
633 | if (length == MTDPART_SIZ_FULL) | |
634 | length = master->size - offset; | |
635 | ||
636 | if (length <= 0) | |
637 | return -EINVAL; | |
638 | ||
93867233 | 639 | memset(&part, 0, sizeof(part)); |
5daa7b21 RT |
640 | part.name = name; |
641 | part.size = length; | |
642 | part.offset = offset; | |
5daa7b21 RT |
643 | |
644 | new = allocate_partition(master, &part, -1, offset); | |
645 | if (IS_ERR(new)) | |
646 | return PTR_ERR(new); | |
647 | ||
5daa7b21 | 648 | mutex_lock(&mtd_partitions_mutex); |
5daa7b21 RT |
649 | list_add(&new->list, &mtd_partitions); |
650 | mutex_unlock(&mtd_partitions_mutex); | |
651 | ||
652 | add_mtd_device(&new->mtd); | |
653 | ||
a62c24d7 DE |
654 | mtd_add_partition_attrs(new); |
655 | ||
5daa7b21 | 656 | return ret; |
5daa7b21 RT |
657 | } |
658 | EXPORT_SYMBOL_GPL(mtd_add_partition); | |
659 | ||
660 | int mtd_del_partition(struct mtd_info *master, int partno) | |
661 | { | |
662 | struct mtd_part *slave, *next; | |
663 | int ret = -EINVAL; | |
664 | ||
665 | mutex_lock(&mtd_partitions_mutex); | |
666 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) | |
667 | if ((slave->master == master) && | |
668 | (slave->mtd.index == partno)) { | |
a62c24d7 DE |
669 | sysfs_remove_files(&slave->mtd.dev.kobj, |
670 | mtd_partition_attrs); | |
5daa7b21 RT |
671 | ret = del_mtd_device(&slave->mtd); |
672 | if (ret < 0) | |
673 | break; | |
674 | ||
675 | list_del(&slave->list); | |
676 | free_partition(slave); | |
677 | break; | |
678 | } | |
679 | mutex_unlock(&mtd_partitions_mutex); | |
680 | ||
681 | return ret; | |
682 | } | |
683 | EXPORT_SYMBOL_GPL(mtd_del_partition); | |
684 | ||
1da177e4 LT |
685 | /* |
686 | * This function, given a master MTD object and a partition table, creates | |
687 | * and registers slave MTD objects which are bound to the master according to | |
688 | * the partition definitions. | |
1f24b5a8 | 689 | * |
727dc612 DE |
690 | * For historical reasons, this function's caller only registers the master |
691 | * if the MTD_PARTITIONED_MASTER config option is set. | |
1da177e4 LT |
692 | */ |
693 | ||
97894cda | 694 | int add_mtd_partitions(struct mtd_info *master, |
1da177e4 LT |
695 | const struct mtd_partition *parts, |
696 | int nbparts) | |
697 | { | |
698 | struct mtd_part *slave; | |
69423d99 | 699 | uint64_t cur_offset = 0; |
1da177e4 LT |
700 | int i; |
701 | ||
b33a2887 | 702 | printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); |
1da177e4 LT |
703 | |
704 | for (i = 0; i < nbparts; i++) { | |
5daa7b21 | 705 | slave = allocate_partition(master, parts + i, i, cur_offset); |
e5bae867 BB |
706 | if (IS_ERR(slave)) { |
707 | del_mtd_partitions(master); | |
5daa7b21 | 708 | return PTR_ERR(slave); |
e5bae867 | 709 | } |
5daa7b21 RT |
710 | |
711 | mutex_lock(&mtd_partitions_mutex); | |
712 | list_add(&slave->list, &mtd_partitions); | |
713 | mutex_unlock(&mtd_partitions_mutex); | |
714 | ||
715 | add_mtd_device(&slave->mtd); | |
a62c24d7 | 716 | mtd_add_partition_attrs(slave); |
5daa7b21 | 717 | |
1da177e4 | 718 | cur_offset = slave->offset + slave->mtd.size; |
1da177e4 LT |
719 | } |
720 | ||
721 | return 0; | |
722 | } | |
1da177e4 LT |
723 | |
724 | static DEFINE_SPINLOCK(part_parser_lock); | |
725 | static LIST_HEAD(part_parsers); | |
726 | ||
5531ae48 | 727 | static struct mtd_part_parser *mtd_part_parser_get(const char *name) |
1da177e4 | 728 | { |
71a928c0 | 729 | struct mtd_part_parser *p, *ret = NULL; |
1da177e4 | 730 | |
71a928c0 | 731 | spin_lock(&part_parser_lock); |
1da177e4 | 732 | |
71a928c0 | 733 | list_for_each_entry(p, &part_parsers, list) |
1da177e4 LT |
734 | if (!strcmp(p->name, name) && try_module_get(p->owner)) { |
735 | ret = p; | |
736 | break; | |
737 | } | |
71a928c0 | 738 | |
1da177e4 LT |
739 | spin_unlock(&part_parser_lock); |
740 | ||
741 | return ret; | |
742 | } | |
743 | ||
5531ae48 BN |
744 | static inline void mtd_part_parser_put(const struct mtd_part_parser *p) |
745 | { | |
746 | module_put(p->owner); | |
747 | } | |
953b3bd1 | 748 | |
adc83bf8 BN |
749 | /* |
750 | * Many partition parsers just expected the core to kfree() all their data in | |
751 | * one chunk. Do that by default. | |
752 | */ | |
753 | static void mtd_part_parser_cleanup_default(const struct mtd_partition *pparts, | |
754 | int nr_parts) | |
755 | { | |
756 | kfree(pparts); | |
757 | } | |
758 | ||
b9eab011 | 759 | int __register_mtd_parser(struct mtd_part_parser *p, struct module *owner) |
1da177e4 | 760 | { |
b9eab011 BN |
761 | p->owner = owner; |
762 | ||
adc83bf8 BN |
763 | if (!p->cleanup) |
764 | p->cleanup = &mtd_part_parser_cleanup_default; | |
765 | ||
1da177e4 LT |
766 | spin_lock(&part_parser_lock); |
767 | list_add(&p->list, &part_parsers); | |
768 | spin_unlock(&part_parser_lock); | |
b9eab011 BN |
769 | |
770 | return 0; | |
1da177e4 | 771 | } |
b9eab011 | 772 | EXPORT_SYMBOL_GPL(__register_mtd_parser); |
1da177e4 | 773 | |
cf3b2b1e | 774 | void deregister_mtd_parser(struct mtd_part_parser *p) |
1da177e4 LT |
775 | { |
776 | spin_lock(&part_parser_lock); | |
777 | list_del(&p->list); | |
778 | spin_unlock(&part_parser_lock); | |
1da177e4 | 779 | } |
b33a2887 | 780 | EXPORT_SYMBOL_GPL(deregister_mtd_parser); |
1da177e4 | 781 | |
ad274cec AB |
782 | /* |
783 | * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you | |
784 | * are changing this array! | |
785 | */ | |
ccef4dcc | 786 | static const char * const default_mtd_part_types[] = { |
d26c87d6 DES |
787 | "cmdlinepart", |
788 | "ofpart", | |
789 | NULL | |
790 | }; | |
5c4eefbd | 791 | |
ad274cec AB |
792 | /** |
793 | * parse_mtd_partitions - parse MTD partitions | |
794 | * @master: the master partition (describes whole MTD device) | |
795 | * @types: names of partition parsers to try or %NULL | |
07fd2f87 | 796 | * @pparts: info about partitions found is returned here |
c7975330 | 797 | * @data: MTD partition parser-specific data |
ad274cec AB |
798 | * |
799 | * This function tries to find partition on MTD device @master. It uses MTD | |
800 | * partition parsers, specified in @types. However, if @types is %NULL, then | |
801 | * the default list of parsers is used. The default list contains only the | |
d26c87d6 | 802 | * "cmdlinepart" and "ofpart" parsers ATM. |
c51803dd HS |
803 | * Note: If there are more then one parser in @types, the kernel only takes the |
804 | * partitions parsed out by the first parser. | |
ad274cec AB |
805 | * |
806 | * This function may return: | |
807 | * o a negative error code in case of failure | |
07fd2f87 | 808 | * o zero otherwise, and @pparts will describe the partitions, number of |
adc83bf8 BN |
809 | * partitions, and the parser which parsed them. Caller must release |
810 | * resources with mtd_part_parser_cleanup() when finished with the returned | |
811 | * data. | |
ad274cec | 812 | */ |
26a47346 | 813 | int parse_mtd_partitions(struct mtd_info *master, const char *const *types, |
07fd2f87 | 814 | struct mtd_partitions *pparts, |
c7975330 | 815 | struct mtd_part_parser_data *data) |
1da177e4 LT |
816 | { |
817 | struct mtd_part_parser *parser; | |
5a2415b0 | 818 | int ret, err = 0; |
97894cda | 819 | |
5c4eefbd DES |
820 | if (!types) |
821 | types = default_mtd_part_types; | |
822 | ||
5a2415b0 | 823 | for ( ; *types; types++) { |
8e2c992b | 824 | pr_debug("%s: parsing partitions %s\n", master->name, *types); |
5531ae48 | 825 | parser = mtd_part_parser_get(*types); |
1da177e4 | 826 | if (!parser && !request_module("%s", *types)) |
5531ae48 | 827 | parser = mtd_part_parser_get(*types); |
8e2c992b MS |
828 | pr_debug("%s: got parser %s\n", master->name, |
829 | parser ? parser->name : NULL); | |
7c802fbd | 830 | if (!parser) |
1da177e4 | 831 | continue; |
07fd2f87 | 832 | ret = (*parser->parse_fn)(master, &pparts->parts, data); |
8e2c992b MS |
833 | pr_debug("%s: parser %s: %i\n", |
834 | master->name, parser->name, ret); | |
1da177e4 | 835 | if (ret > 0) { |
97894cda | 836 | printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n", |
1da177e4 | 837 | ret, parser->name, master->name); |
07fd2f87 BN |
838 | pparts->nr_parts = ret; |
839 | pparts->parser = parser; | |
840 | return 0; | |
1da177e4 | 841 | } |
adc83bf8 | 842 | mtd_part_parser_put(parser); |
5a2415b0 BN |
843 | /* |
844 | * Stash the first error we see; only report it if no parser | |
845 | * succeeds | |
846 | */ | |
847 | if (ret < 0 && !err) | |
848 | err = ret; | |
1da177e4 | 849 | } |
5a2415b0 | 850 | return err; |
1da177e4 | 851 | } |
5daa7b21 | 852 | |
adc83bf8 BN |
853 | void mtd_part_parser_cleanup(struct mtd_partitions *parts) |
854 | { | |
855 | const struct mtd_part_parser *parser; | |
856 | ||
857 | if (!parts) | |
858 | return; | |
859 | ||
860 | parser = parts->parser; | |
861 | if (parser) { | |
862 | if (parser->cleanup) | |
863 | parser->cleanup(parts->parts, parts->nr_parts); | |
864 | ||
865 | mtd_part_parser_put(parser); | |
866 | } | |
867 | } | |
868 | ||
5dee4674 | 869 | int mtd_is_partition(const struct mtd_info *mtd) |
5daa7b21 RT |
870 | { |
871 | struct mtd_part *part; | |
a7e93dcd | 872 | int ispart = 0; |
5daa7b21 RT |
873 | |
874 | mutex_lock(&mtd_partitions_mutex); | |
875 | list_for_each_entry(part, &mtd_partitions, list) | |
876 | if (&part->mtd == mtd) { | |
a7e93dcd | 877 | ispart = 1; |
5daa7b21 RT |
878 | break; |
879 | } | |
880 | mutex_unlock(&mtd_partitions_mutex); | |
881 | ||
a7e93dcd | 882 | return ispart; |
5daa7b21 | 883 | } |
a7e93dcd | 884 | EXPORT_SYMBOL_GPL(mtd_is_partition); |
62082e56 RG |
885 | |
886 | /* Returns the size of the entire flash chip */ | |
887 | uint64_t mtd_get_device_size(const struct mtd_info *mtd) | |
888 | { | |
889 | if (!mtd_is_partition(mtd)) | |
890 | return mtd->size; | |
891 | ||
2524534d | 892 | return mtd_to_part(mtd)->master->size; |
62082e56 RG |
893 | } |
894 | EXPORT_SYMBOL_GPL(mtd_get_device_size); |