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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> |
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 | |
2524534d | 50 | * the pointer to that structure. |
1da177e4 | 51 | */ |
2524534d BN |
52 | static inline struct mtd_part *mtd_to_part(const struct mtd_info *mtd) |
53 | { | |
54 | return container_of(mtd, struct mtd_part, mtd); | |
55 | } | |
1da177e4 | 56 | |
97894cda TG |
57 | |
58 | /* | |
1da177e4 LT |
59 | * MTD methods which simply translate the effective address and pass through |
60 | * to the _real_ device. | |
61 | */ | |
62 | ||
b33a2887 AN |
63 | static int part_read(struct mtd_info *mtd, loff_t from, size_t len, |
64 | size_t *retlen, u_char *buf) | |
1da177e4 | 65 | { |
2524534d | 66 | struct mtd_part *part = mtd_to_part(mtd); |
d8877f19 | 67 | struct mtd_ecc_stats stats; |
f1a28c02 TG |
68 | int res; |
69 | ||
d8877f19 | 70 | stats = part->master->ecc_stats; |
994c8409 MD |
71 | res = part->master->_read(part->master, from + part->offset, len, |
72 | retlen, buf); | |
edbc4540 MD |
73 | if (unlikely(mtd_is_eccerr(res))) |
74 | mtd->ecc_stats.failed += | |
75 | part->master->ecc_stats.failed - stats.failed; | |
76 | else | |
77 | mtd->ecc_stats.corrected += | |
78 | part->master->ecc_stats.corrected - stats.corrected; | |
f1a28c02 | 79 | return res; |
1da177e4 LT |
80 | } |
81 | ||
b33a2887 AN |
82 | static int part_point(struct mtd_info *mtd, loff_t from, size_t len, |
83 | size_t *retlen, void **virt, resource_size_t *phys) | |
1da177e4 | 84 | { |
2524534d | 85 | struct mtd_part *part = mtd_to_part(mtd); |
5def4898 | 86 | |
994c8409 MD |
87 | return part->master->_point(part->master, from + part->offset, len, |
88 | retlen, virt, phys); | |
1da177e4 | 89 | } |
9223a456 | 90 | |
5e4e6e3f | 91 | static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) |
1da177e4 | 92 | { |
2524534d | 93 | struct mtd_part *part = mtd_to_part(mtd); |
1da177e4 | 94 | |
994c8409 | 95 | return part->master->_unpoint(part->master, from + part->offset, len); |
1da177e4 LT |
96 | } |
97 | ||
402d3265 DH |
98 | static unsigned long part_get_unmapped_area(struct mtd_info *mtd, |
99 | unsigned long len, | |
100 | unsigned long offset, | |
101 | unsigned long flags) | |
102 | { | |
2524534d | 103 | struct mtd_part *part = mtd_to_part(mtd); |
402d3265 DH |
104 | |
105 | offset += part->offset; | |
994c8409 MD |
106 | return part->master->_get_unmapped_area(part->master, len, offset, |
107 | flags); | |
402d3265 DH |
108 | } |
109 | ||
8593fbc6 | 110 | static int part_read_oob(struct mtd_info *mtd, loff_t from, |
b33a2887 | 111 | struct mtd_oob_ops *ops) |
1da177e4 | 112 | { |
2524534d | 113 | struct mtd_part *part = mtd_to_part(mtd); |
f1a28c02 | 114 | int res; |
8593fbc6 | 115 | |
1da177e4 | 116 | if (from >= mtd->size) |
8593fbc6 | 117 | return -EINVAL; |
7014568b | 118 | if (ops->datbuf && from + ops->len > mtd->size) |
8593fbc6 | 119 | return -EINVAL; |
f1a28c02 | 120 | |
154bf89f AB |
121 | /* |
122 | * If OOB is also requested, make sure that we do not read past the end | |
123 | * of this partition. | |
124 | */ | |
125 | if (ops->oobbuf) { | |
126 | size_t len, pages; | |
127 | ||
29f1058a | 128 | len = mtd_oobavail(mtd, ops); |
154bf89f AB |
129 | pages = mtd_div_by_ws(mtd->size, mtd); |
130 | pages -= mtd_div_by_ws(from, mtd); | |
131 | if (ops->ooboffs + ops->ooblen > pages * len) | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
994c8409 | 135 | res = part->master->_read_oob(part->master, from + part->offset, ops); |
f1a28c02 | 136 | if (unlikely(res)) { |
d57f4054 | 137 | if (mtd_is_bitflip(res)) |
f1a28c02 | 138 | mtd->ecc_stats.corrected++; |
d57f4054 | 139 | if (mtd_is_eccerr(res)) |
f1a28c02 TG |
140 | mtd->ecc_stats.failed++; |
141 | } | |
142 | return res; | |
1da177e4 LT |
143 | } |
144 | ||
b33a2887 AN |
145 | static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from, |
146 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 | 147 | { |
2524534d | 148 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
149 | return part->master->_read_user_prot_reg(part->master, from, len, |
150 | retlen, buf); | |
1da177e4 LT |
151 | } |
152 | ||
4b78fc42 CR |
153 | static int part_get_user_prot_info(struct mtd_info *mtd, size_t len, |
154 | size_t *retlen, struct otp_info *buf) | |
f77814dd | 155 | { |
2524534d | 156 | struct mtd_part *part = mtd_to_part(mtd); |
4b78fc42 CR |
157 | return part->master->_get_user_prot_info(part->master, len, retlen, |
158 | buf); | |
f77814dd NP |
159 | } |
160 | ||
b33a2887 AN |
161 | static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, |
162 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 | 163 | { |
2524534d | 164 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
165 | return part->master->_read_fact_prot_reg(part->master, from, len, |
166 | retlen, buf); | |
1da177e4 LT |
167 | } |
168 | ||
4b78fc42 CR |
169 | static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len, |
170 | size_t *retlen, struct otp_info *buf) | |
f77814dd | 171 | { |
2524534d | 172 | struct mtd_part *part = mtd_to_part(mtd); |
4b78fc42 CR |
173 | return part->master->_get_fact_prot_info(part->master, len, retlen, |
174 | buf); | |
f77814dd NP |
175 | } |
176 | ||
b33a2887 AN |
177 | static int part_write(struct mtd_info *mtd, loff_t to, size_t len, |
178 | size_t *retlen, const u_char *buf) | |
1da177e4 | 179 | { |
2524534d | 180 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
181 | return part->master->_write(part->master, to + part->offset, len, |
182 | retlen, buf); | |
1da177e4 LT |
183 | } |
184 | ||
b33a2887 AN |
185 | static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len, |
186 | size_t *retlen, const u_char *buf) | |
388bbb09 | 187 | { |
2524534d | 188 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
189 | return part->master->_panic_write(part->master, to + part->offset, len, |
190 | retlen, buf); | |
388bbb09 RP |
191 | } |
192 | ||
8593fbc6 | 193 | static int part_write_oob(struct mtd_info *mtd, loff_t to, |
b33a2887 | 194 | struct mtd_oob_ops *ops) |
1da177e4 | 195 | { |
2524534d | 196 | struct mtd_part *part = mtd_to_part(mtd); |
8593fbc6 | 197 | |
1da177e4 | 198 | if (to >= mtd->size) |
8593fbc6 | 199 | return -EINVAL; |
7014568b | 200 | if (ops->datbuf && to + ops->len > mtd->size) |
8593fbc6 | 201 | return -EINVAL; |
994c8409 | 202 | return part->master->_write_oob(part->master, to + part->offset, ops); |
1da177e4 LT |
203 | } |
204 | ||
b33a2887 AN |
205 | static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from, |
206 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 | 207 | { |
2524534d | 208 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
209 | return part->master->_write_user_prot_reg(part->master, from, len, |
210 | retlen, buf); | |
1da177e4 LT |
211 | } |
212 | ||
b33a2887 AN |
213 | static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, |
214 | size_t len) | |
f77814dd | 215 | { |
2524534d | 216 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 217 | return part->master->_lock_user_prot_reg(part->master, from, len); |
f77814dd NP |
218 | } |
219 | ||
b33a2887 AN |
220 | static int part_writev(struct mtd_info *mtd, const struct kvec *vecs, |
221 | unsigned long count, loff_t to, size_t *retlen) | |
1da177e4 | 222 | { |
2524534d | 223 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 MD |
224 | return part->master->_writev(part->master, vecs, count, |
225 | to + part->offset, retlen); | |
1da177e4 LT |
226 | } |
227 | ||
b33a2887 | 228 | static int part_erase(struct mtd_info *mtd, struct erase_info *instr) |
1da177e4 | 229 | { |
2524534d | 230 | struct mtd_part *part = mtd_to_part(mtd); |
1da177e4 | 231 | int ret; |
664addc2 | 232 | |
1da177e4 | 233 | instr->addr += part->offset; |
994c8409 | 234 | ret = part->master->_erase(part->master, instr); |
74641d75 | 235 | if (ret) { |
bb0eb217 | 236 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
74641d75 AH |
237 | instr->fail_addr -= part->offset; |
238 | instr->addr -= part->offset; | |
239 | } | |
1da177e4 LT |
240 | return ret; |
241 | } | |
242 | ||
243 | void mtd_erase_callback(struct erase_info *instr) | |
244 | { | |
3c3c10bb | 245 | if (instr->mtd->_erase == part_erase) { |
2524534d | 246 | struct mtd_part *part = mtd_to_part(instr->mtd); |
1da177e4 | 247 | |
bb0eb217 | 248 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
1da177e4 LT |
249 | instr->fail_addr -= part->offset; |
250 | instr->addr -= part->offset; | |
251 | } | |
252 | if (instr->callback) | |
253 | instr->callback(instr); | |
254 | } | |
255 | EXPORT_SYMBOL_GPL(mtd_erase_callback); | |
256 | ||
69423d99 | 257 | static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 | 258 | { |
2524534d | 259 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 260 | return part->master->_lock(part->master, ofs + part->offset, len); |
1da177e4 LT |
261 | } |
262 | ||
69423d99 | 263 | static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 | 264 | { |
2524534d | 265 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 266 | return part->master->_unlock(part->master, ofs + part->offset, len); |
1da177e4 LT |
267 | } |
268 | ||
9938424f RC |
269 | static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
270 | { | |
2524534d | 271 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 272 | return part->master->_is_locked(part->master, ofs + part->offset, len); |
9938424f RC |
273 | } |
274 | ||
1da177e4 LT |
275 | static void part_sync(struct mtd_info *mtd) |
276 | { | |
2524534d | 277 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 278 | part->master->_sync(part->master); |
1da177e4 LT |
279 | } |
280 | ||
281 | static int part_suspend(struct mtd_info *mtd) | |
282 | { | |
2524534d | 283 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 284 | return part->master->_suspend(part->master); |
1da177e4 LT |
285 | } |
286 | ||
287 | static void part_resume(struct mtd_info *mtd) | |
288 | { | |
2524534d | 289 | struct mtd_part *part = mtd_to_part(mtd); |
994c8409 | 290 | part->master->_resume(part->master); |
1da177e4 LT |
291 | } |
292 | ||
8471bb73 EG |
293 | static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs) |
294 | { | |
2524534d | 295 | struct mtd_part *part = mtd_to_part(mtd); |
8471bb73 EG |
296 | ofs += part->offset; |
297 | return part->master->_block_isreserved(part->master, ofs); | |
298 | } | |
299 | ||
b33a2887 | 300 | static int part_block_isbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 | 301 | { |
2524534d | 302 | struct mtd_part *part = mtd_to_part(mtd); |
1da177e4 | 303 | ofs += part->offset; |
994c8409 | 304 | return part->master->_block_isbad(part->master, ofs); |
1da177e4 LT |
305 | } |
306 | ||
b33a2887 | 307 | static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 | 308 | { |
2524534d | 309 | struct mtd_part *part = mtd_to_part(mtd); |
f1a28c02 TG |
310 | int res; |
311 | ||
1da177e4 | 312 | ofs += part->offset; |
994c8409 | 313 | res = part->master->_block_markbad(part->master, ofs); |
f1a28c02 TG |
314 | if (!res) |
315 | mtd->ecc_stats.badblocks++; | |
316 | return res; | |
1da177e4 LT |
317 | } |
318 | ||
5e149073 RW |
319 | static int part_get_device(struct mtd_info *mtd) |
320 | { | |
321 | struct mtd_part *part = mtd_to_part(mtd); | |
322 | return part->master->_get_device(part->master); | |
323 | } | |
324 | ||
325 | static void part_put_device(struct mtd_info *mtd) | |
326 | { | |
327 | struct mtd_part *part = mtd_to_part(mtd); | |
328 | part->master->_put_device(part->master); | |
329 | } | |
330 | ||
adbbc3bc BB |
331 | static int part_ooblayout_ecc(struct mtd_info *mtd, int section, |
332 | struct mtd_oob_region *oobregion) | |
333 | { | |
334 | struct mtd_part *part = mtd_to_part(mtd); | |
335 | ||
336 | return mtd_ooblayout_ecc(part->master, section, oobregion); | |
337 | } | |
338 | ||
339 | static int part_ooblayout_free(struct mtd_info *mtd, int section, | |
340 | struct mtd_oob_region *oobregion) | |
341 | { | |
342 | struct mtd_part *part = mtd_to_part(mtd); | |
343 | ||
344 | return mtd_ooblayout_free(part->master, section, oobregion); | |
345 | } | |
346 | ||
347 | static const struct mtd_ooblayout_ops part_ooblayout_ops = { | |
348 | .ecc = part_ooblayout_ecc, | |
349 | .free = part_ooblayout_free, | |
350 | }; | |
351 | ||
6080ef6e JW |
352 | static int part_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len) |
353 | { | |
354 | struct mtd_part *part = mtd_to_part(mtd); | |
355 | ||
356 | return part->master->_max_bad_blocks(part->master, | |
357 | ofs + part->offset, len); | |
358 | } | |
359 | ||
5daa7b21 RT |
360 | static inline void free_partition(struct mtd_part *p) |
361 | { | |
362 | kfree(p->mtd.name); | |
363 | kfree(p); | |
364 | } | |
365 | ||
5daa7b21 RT |
366 | static struct mtd_part *allocate_partition(struct mtd_info *master, |
367 | const struct mtd_partition *part, int partno, | |
368 | uint64_t cur_offset) | |
7788ba71 | 369 | { |
1eeef2d7 CP |
370 | int wr_alignment = (master->flags & MTD_NO_ERASE) ? master->writesize: |
371 | master->erasesize; | |
7788ba71 | 372 | struct mtd_part *slave; |
1eeef2d7 | 373 | u32 remainder; |
5daa7b21 | 374 | char *name; |
1eeef2d7 | 375 | u64 tmp; |
7788ba71 AN |
376 | |
377 | /* allocate the partition structure */ | |
b33a2887 | 378 | slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
5daa7b21 RT |
379 | name = kstrdup(part->name, GFP_KERNEL); |
380 | if (!name || !slave) { | |
b33a2887 | 381 | printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n", |
5daa7b21 RT |
382 | master->name); |
383 | kfree(name); | |
384 | kfree(slave); | |
385 | return ERR_PTR(-ENOMEM); | |
7788ba71 | 386 | } |
7788ba71 AN |
387 | |
388 | /* set up the MTD object for this partition */ | |
389 | slave->mtd.type = master->type; | |
390 | slave->mtd.flags = master->flags & ~part->mask_flags; | |
391 | slave->mtd.size = part->size; | |
392 | slave->mtd.writesize = master->writesize; | |
7fa33ac0 | 393 | slave->mtd.writebufsize = master->writebufsize; |
7788ba71 AN |
394 | slave->mtd.oobsize = master->oobsize; |
395 | slave->mtd.oobavail = master->oobavail; | |
396 | slave->mtd.subpage_sft = master->subpage_sft; | |
477b0229 | 397 | slave->mtd.pairing = master->pairing; |
7788ba71 | 398 | |
5daa7b21 | 399 | slave->mtd.name = name; |
7788ba71 AN |
400 | slave->mtd.owner = master->owner; |
401 | ||
727dc612 DE |
402 | /* NOTE: Historically, we didn't arrange MTDs as a tree out of |
403 | * concern for showing the same data in multiple partitions. | |
404 | * However, it is very useful to have the master node present, | |
405 | * so the MTD_PARTITIONED_MASTER option allows that. The master | |
406 | * will have device nodes etc only if this is set, so make the | |
407 | * parent conditional on that option. Note, this is a way to | |
408 | * distinguish between the master and the partition in sysfs. | |
1f24b5a8 | 409 | */ |
727dc612 DE |
410 | slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) ? |
411 | &master->dev : | |
412 | master->dev.parent; | |
42e9401b | 413 | slave->mtd.dev.of_node = part->of_node; |
1f24b5a8 | 414 | |
3c3c10bb AB |
415 | slave->mtd._read = part_read; |
416 | slave->mtd._write = part_write; | |
7788ba71 | 417 | |
3c3c10bb AB |
418 | if (master->_panic_write) |
419 | slave->mtd._panic_write = part_panic_write; | |
7788ba71 | 420 | |
3c3c10bb AB |
421 | if (master->_point && master->_unpoint) { |
422 | slave->mtd._point = part_point; | |
423 | slave->mtd._unpoint = part_unpoint; | |
7788ba71 AN |
424 | } |
425 | ||
3c3c10bb AB |
426 | if (master->_get_unmapped_area) |
427 | slave->mtd._get_unmapped_area = part_get_unmapped_area; | |
428 | if (master->_read_oob) | |
429 | slave->mtd._read_oob = part_read_oob; | |
430 | if (master->_write_oob) | |
431 | slave->mtd._write_oob = part_write_oob; | |
432 | if (master->_read_user_prot_reg) | |
433 | slave->mtd._read_user_prot_reg = part_read_user_prot_reg; | |
434 | if (master->_read_fact_prot_reg) | |
435 | slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg; | |
436 | if (master->_write_user_prot_reg) | |
437 | slave->mtd._write_user_prot_reg = part_write_user_prot_reg; | |
438 | if (master->_lock_user_prot_reg) | |
439 | slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg; | |
440 | if (master->_get_user_prot_info) | |
441 | slave->mtd._get_user_prot_info = part_get_user_prot_info; | |
442 | if (master->_get_fact_prot_info) | |
443 | slave->mtd._get_fact_prot_info = part_get_fact_prot_info; | |
444 | if (master->_sync) | |
445 | slave->mtd._sync = part_sync; | |
446 | if (!partno && !master->dev.class && master->_suspend && | |
447 | master->_resume) { | |
448 | slave->mtd._suspend = part_suspend; | |
449 | slave->mtd._resume = part_resume; | |
7788ba71 | 450 | } |
3c3c10bb AB |
451 | if (master->_writev) |
452 | slave->mtd._writev = part_writev; | |
453 | if (master->_lock) | |
454 | slave->mtd._lock = part_lock; | |
455 | if (master->_unlock) | |
456 | slave->mtd._unlock = part_unlock; | |
457 | if (master->_is_locked) | |
458 | slave->mtd._is_locked = part_is_locked; | |
8471bb73 EG |
459 | if (master->_block_isreserved) |
460 | slave->mtd._block_isreserved = part_block_isreserved; | |
3c3c10bb AB |
461 | if (master->_block_isbad) |
462 | slave->mtd._block_isbad = part_block_isbad; | |
463 | if (master->_block_markbad) | |
464 | slave->mtd._block_markbad = part_block_markbad; | |
6080ef6e JW |
465 | if (master->_max_bad_blocks) |
466 | slave->mtd._max_bad_blocks = part_max_bad_blocks; | |
5e149073 RW |
467 | |
468 | if (master->_get_device) | |
469 | slave->mtd._get_device = part_get_device; | |
470 | if (master->_put_device) | |
471 | slave->mtd._put_device = part_put_device; | |
472 | ||
3c3c10bb | 473 | slave->mtd._erase = part_erase; |
7788ba71 AN |
474 | slave->master = master; |
475 | slave->offset = part->offset; | |
7788ba71 AN |
476 | |
477 | if (slave->offset == MTDPART_OFS_APPEND) | |
478 | slave->offset = cur_offset; | |
479 | if (slave->offset == MTDPART_OFS_NXTBLK) { | |
1eeef2d7 | 480 | tmp = cur_offset; |
7788ba71 | 481 | slave->offset = cur_offset; |
1eeef2d7 CP |
482 | remainder = do_div(tmp, wr_alignment); |
483 | if (remainder) { | |
484 | slave->offset += wr_alignment - remainder; | |
7788ba71 | 485 | printk(KERN_NOTICE "Moving partition %d: " |
69423d99 AH |
486 | "0x%012llx -> 0x%012llx\n", partno, |
487 | (unsigned long long)cur_offset, (unsigned long long)slave->offset); | |
7788ba71 AN |
488 | } |
489 | } | |
1a31368b DB |
490 | if (slave->offset == MTDPART_OFS_RETAIN) { |
491 | slave->offset = cur_offset; | |
492 | if (master->size - slave->offset >= slave->mtd.size) { | |
493 | slave->mtd.size = master->size - slave->offset | |
494 | - slave->mtd.size; | |
495 | } else { | |
496 | printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n", | |
497 | part->name, master->size - slave->offset, | |
498 | slave->mtd.size); | |
499 | /* register to preserve ordering */ | |
500 | goto out_register; | |
501 | } | |
502 | } | |
7788ba71 AN |
503 | if (slave->mtd.size == MTDPART_SIZ_FULL) |
504 | slave->mtd.size = master->size - slave->offset; | |
505 | ||
69423d99 AH |
506 | printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset, |
507 | (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name); | |
7788ba71 AN |
508 | |
509 | /* let's do some sanity checks */ | |
510 | if (slave->offset >= master->size) { | |
f636ffb4 | 511 | /* let's register it anyway to preserve ordering */ |
7788ba71 AN |
512 | slave->offset = 0; |
513 | slave->mtd.size = 0; | |
b33a2887 | 514 | printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n", |
7788ba71 | 515 | part->name); |
f636ffb4 | 516 | goto out_register; |
7788ba71 AN |
517 | } |
518 | if (slave->offset + slave->mtd.size > master->size) { | |
519 | slave->mtd.size = master->size - slave->offset; | |
69423d99 AH |
520 | printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n", |
521 | part->name, master->name, (unsigned long long)slave->mtd.size); | |
7788ba71 | 522 | } |
b33a2887 | 523 | if (master->numeraseregions > 1) { |
7788ba71 | 524 | /* Deal with variable erase size stuff */ |
6910c136 | 525 | int i, max = master->numeraseregions; |
69423d99 | 526 | u64 end = slave->offset + slave->mtd.size; |
7788ba71 AN |
527 | struct mtd_erase_region_info *regions = master->eraseregions; |
528 | ||
6910c136 AN |
529 | /* Find the first erase regions which is part of this |
530 | * partition. */ | |
531 | for (i = 0; i < max && regions[i].offset <= slave->offset; i++) | |
7788ba71 | 532 | ; |
6910c136 | 533 | /* The loop searched for the region _behind_ the first one */ |
a57ca046 RK |
534 | if (i > 0) |
535 | i--; | |
7788ba71 | 536 | |
6910c136 AN |
537 | /* Pick biggest erasesize */ |
538 | for (; i < max && regions[i].offset < end; i++) { | |
7788ba71 AN |
539 | if (slave->mtd.erasesize < regions[i].erasesize) { |
540 | slave->mtd.erasesize = regions[i].erasesize; | |
541 | } | |
542 | } | |
6910c136 | 543 | BUG_ON(slave->mtd.erasesize == 0); |
7788ba71 AN |
544 | } else { |
545 | /* Single erase size */ | |
546 | slave->mtd.erasesize = master->erasesize; | |
547 | } | |
548 | ||
1eeef2d7 CP |
549 | tmp = slave->offset; |
550 | remainder = do_div(tmp, wr_alignment); | |
551 | if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) { | |
7788ba71 | 552 | /* Doesn't start on a boundary of major erase size */ |
b33a2887 AN |
553 | /* FIXME: Let it be writable if it is on a boundary of |
554 | * _minor_ erase size though */ | |
7788ba71 | 555 | slave->mtd.flags &= ~MTD_WRITEABLE; |
1eeef2d7 | 556 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n", |
7788ba71 AN |
557 | part->name); |
558 | } | |
1eeef2d7 CP |
559 | |
560 | tmp = slave->mtd.size; | |
561 | remainder = do_div(tmp, wr_alignment); | |
562 | if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) { | |
7788ba71 | 563 | slave->mtd.flags &= ~MTD_WRITEABLE; |
1eeef2d7 | 564 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n", |
7788ba71 AN |
565 | part->name); |
566 | } | |
567 | ||
adbbc3bc | 568 | mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops); |
bdf69c47 | 569 | slave->mtd.ecc_step_size = master->ecc_step_size; |
6a918bad | 570 | slave->mtd.ecc_strength = master->ecc_strength; |
d062d4ed MD |
571 | slave->mtd.bitflip_threshold = master->bitflip_threshold; |
572 | ||
3c3c10bb | 573 | if (master->_block_isbad) { |
69423d99 | 574 | uint64_t offs = 0; |
7788ba71 | 575 | |
b33a2887 | 576 | while (offs < slave->mtd.size) { |
fdf43a42 EG |
577 | if (mtd_block_isreserved(master, offs + slave->offset)) |
578 | slave->mtd.ecc_stats.bbtblocks++; | |
579 | else if (mtd_block_isbad(master, offs + slave->offset)) | |
7788ba71 AN |
580 | slave->mtd.ecc_stats.badblocks++; |
581 | offs += slave->mtd.erasesize; | |
582 | } | |
583 | } | |
584 | ||
f636ffb4 | 585 | out_register: |
7788ba71 AN |
586 | return slave; |
587 | } | |
588 | ||
a62c24d7 DE |
589 | static ssize_t mtd_partition_offset_show(struct device *dev, |
590 | struct device_attribute *attr, char *buf) | |
591 | { | |
592 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
2524534d | 593 | struct mtd_part *part = mtd_to_part(mtd); |
a62c24d7 DE |
594 | return snprintf(buf, PAGE_SIZE, "%lld\n", part->offset); |
595 | } | |
596 | ||
597 | static DEVICE_ATTR(offset, S_IRUGO, mtd_partition_offset_show, NULL); | |
598 | ||
599 | static const struct attribute *mtd_partition_attrs[] = { | |
600 | &dev_attr_offset.attr, | |
601 | NULL | |
602 | }; | |
603 | ||
604 | static int mtd_add_partition_attrs(struct mtd_part *new) | |
605 | { | |
606 | int ret = sysfs_create_files(&new->mtd.dev.kobj, mtd_partition_attrs); | |
607 | if (ret) | |
608 | printk(KERN_WARNING | |
609 | "mtd: failed to create partition attrs, err=%d\n", ret); | |
610 | return ret; | |
611 | } | |
612 | ||
26a6d240 | 613 | int mtd_add_partition(struct mtd_info *master, const char *name, |
5daa7b21 RT |
614 | long long offset, long long length) |
615 | { | |
616 | struct mtd_partition part; | |
3a434f66 | 617 | struct mtd_part *new; |
5daa7b21 RT |
618 | int ret = 0; |
619 | ||
620 | /* the direct offset is expected */ | |
621 | if (offset == MTDPART_OFS_APPEND || | |
622 | offset == MTDPART_OFS_NXTBLK) | |
623 | return -EINVAL; | |
624 | ||
625 | if (length == MTDPART_SIZ_FULL) | |
626 | length = master->size - offset; | |
627 | ||
628 | if (length <= 0) | |
629 | return -EINVAL; | |
630 | ||
93867233 | 631 | memset(&part, 0, sizeof(part)); |
5daa7b21 RT |
632 | part.name = name; |
633 | part.size = length; | |
634 | part.offset = offset; | |
5daa7b21 RT |
635 | |
636 | new = allocate_partition(master, &part, -1, offset); | |
637 | if (IS_ERR(new)) | |
638 | return PTR_ERR(new); | |
639 | ||
5daa7b21 | 640 | mutex_lock(&mtd_partitions_mutex); |
5daa7b21 RT |
641 | list_add(&new->list, &mtd_partitions); |
642 | mutex_unlock(&mtd_partitions_mutex); | |
643 | ||
644 | add_mtd_device(&new->mtd); | |
645 | ||
a62c24d7 DE |
646 | mtd_add_partition_attrs(new); |
647 | ||
5daa7b21 | 648 | return ret; |
5daa7b21 RT |
649 | } |
650 | EXPORT_SYMBOL_GPL(mtd_add_partition); | |
651 | ||
08263a9a RM |
652 | /** |
653 | * __mtd_del_partition - delete MTD partition | |
654 | * | |
655 | * @priv: internal MTD struct for partition to be deleted | |
656 | * | |
657 | * This function must be called with the partitions mutex locked. | |
658 | */ | |
659 | static int __mtd_del_partition(struct mtd_part *priv) | |
660 | { | |
661 | int err; | |
662 | ||
663 | err = del_mtd_device(&priv->mtd); | |
664 | if (err) | |
665 | return err; | |
666 | ||
667 | list_del(&priv->list); | |
668 | free_partition(priv); | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | /* | |
674 | * This function unregisters and destroy all slave MTD objects which are | |
675 | * attached to the given master MTD object. | |
676 | */ | |
677 | int del_mtd_partitions(struct mtd_info *master) | |
678 | { | |
679 | struct mtd_part *slave, *next; | |
680 | int ret, err = 0; | |
681 | ||
682 | mutex_lock(&mtd_partitions_mutex); | |
683 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) | |
684 | if (slave->master == master) { | |
685 | ret = __mtd_del_partition(slave); | |
686 | if (ret < 0) | |
687 | err = ret; | |
688 | } | |
689 | mutex_unlock(&mtd_partitions_mutex); | |
690 | ||
691 | return err; | |
692 | } | |
693 | ||
5daa7b21 RT |
694 | int mtd_del_partition(struct mtd_info *master, int partno) |
695 | { | |
696 | struct mtd_part *slave, *next; | |
697 | int ret = -EINVAL; | |
698 | ||
699 | mutex_lock(&mtd_partitions_mutex); | |
700 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) | |
701 | if ((slave->master == master) && | |
702 | (slave->mtd.index == partno)) { | |
a62c24d7 DE |
703 | sysfs_remove_files(&slave->mtd.dev.kobj, |
704 | mtd_partition_attrs); | |
08263a9a | 705 | ret = __mtd_del_partition(slave); |
5daa7b21 RT |
706 | break; |
707 | } | |
708 | mutex_unlock(&mtd_partitions_mutex); | |
709 | ||
710 | return ret; | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(mtd_del_partition); | |
713 | ||
1da177e4 LT |
714 | /* |
715 | * This function, given a master MTD object and a partition table, creates | |
716 | * and registers slave MTD objects which are bound to the master according to | |
717 | * the partition definitions. | |
1f24b5a8 | 718 | * |
727dc612 DE |
719 | * For historical reasons, this function's caller only registers the master |
720 | * if the MTD_PARTITIONED_MASTER config option is set. | |
1da177e4 LT |
721 | */ |
722 | ||
97894cda | 723 | int add_mtd_partitions(struct mtd_info *master, |
1da177e4 LT |
724 | const struct mtd_partition *parts, |
725 | int nbparts) | |
726 | { | |
727 | struct mtd_part *slave; | |
69423d99 | 728 | uint64_t cur_offset = 0; |
1da177e4 LT |
729 | int i; |
730 | ||
b33a2887 | 731 | printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); |
1da177e4 LT |
732 | |
733 | for (i = 0; i < nbparts; i++) { | |
5daa7b21 | 734 | slave = allocate_partition(master, parts + i, i, cur_offset); |
e5bae867 BB |
735 | if (IS_ERR(slave)) { |
736 | del_mtd_partitions(master); | |
5daa7b21 | 737 | return PTR_ERR(slave); |
e5bae867 | 738 | } |
5daa7b21 RT |
739 | |
740 | mutex_lock(&mtd_partitions_mutex); | |
741 | list_add(&slave->list, &mtd_partitions); | |
742 | mutex_unlock(&mtd_partitions_mutex); | |
743 | ||
744 | add_mtd_device(&slave->mtd); | |
a62c24d7 | 745 | mtd_add_partition_attrs(slave); |
5daa7b21 | 746 | |
1da177e4 | 747 | cur_offset = slave->offset + slave->mtd.size; |
1da177e4 LT |
748 | } |
749 | ||
750 | return 0; | |
751 | } | |
1da177e4 LT |
752 | |
753 | static DEFINE_SPINLOCK(part_parser_lock); | |
754 | static LIST_HEAD(part_parsers); | |
755 | ||
5531ae48 | 756 | static struct mtd_part_parser *mtd_part_parser_get(const char *name) |
1da177e4 | 757 | { |
71a928c0 | 758 | struct mtd_part_parser *p, *ret = NULL; |
1da177e4 | 759 | |
71a928c0 | 760 | spin_lock(&part_parser_lock); |
1da177e4 | 761 | |
71a928c0 | 762 | list_for_each_entry(p, &part_parsers, list) |
1da177e4 LT |
763 | if (!strcmp(p->name, name) && try_module_get(p->owner)) { |
764 | ret = p; | |
765 | break; | |
766 | } | |
71a928c0 | 767 | |
1da177e4 LT |
768 | spin_unlock(&part_parser_lock); |
769 | ||
770 | return ret; | |
771 | } | |
772 | ||
5531ae48 BN |
773 | static inline void mtd_part_parser_put(const struct mtd_part_parser *p) |
774 | { | |
775 | module_put(p->owner); | |
776 | } | |
953b3bd1 | 777 | |
adc83bf8 BN |
778 | /* |
779 | * Many partition parsers just expected the core to kfree() all their data in | |
780 | * one chunk. Do that by default. | |
781 | */ | |
782 | static void mtd_part_parser_cleanup_default(const struct mtd_partition *pparts, | |
783 | int nr_parts) | |
784 | { | |
785 | kfree(pparts); | |
786 | } | |
787 | ||
b9eab011 | 788 | int __register_mtd_parser(struct mtd_part_parser *p, struct module *owner) |
1da177e4 | 789 | { |
b9eab011 BN |
790 | p->owner = owner; |
791 | ||
adc83bf8 BN |
792 | if (!p->cleanup) |
793 | p->cleanup = &mtd_part_parser_cleanup_default; | |
794 | ||
1da177e4 LT |
795 | spin_lock(&part_parser_lock); |
796 | list_add(&p->list, &part_parsers); | |
797 | spin_unlock(&part_parser_lock); | |
b9eab011 BN |
798 | |
799 | return 0; | |
1da177e4 | 800 | } |
b9eab011 | 801 | EXPORT_SYMBOL_GPL(__register_mtd_parser); |
1da177e4 | 802 | |
cf3b2b1e | 803 | void deregister_mtd_parser(struct mtd_part_parser *p) |
1da177e4 LT |
804 | { |
805 | spin_lock(&part_parser_lock); | |
806 | list_del(&p->list); | |
807 | spin_unlock(&part_parser_lock); | |
1da177e4 | 808 | } |
b33a2887 | 809 | EXPORT_SYMBOL_GPL(deregister_mtd_parser); |
1da177e4 | 810 | |
ad274cec AB |
811 | /* |
812 | * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you | |
813 | * are changing this array! | |
814 | */ | |
ccef4dcc | 815 | static const char * const default_mtd_part_types[] = { |
d26c87d6 DB |
816 | "cmdlinepart", |
817 | "ofpart", | |
818 | NULL | |
819 | }; | |
5c4eefbd | 820 | |
01f9c724 BN |
821 | static int mtd_part_do_parse(struct mtd_part_parser *parser, |
822 | struct mtd_info *master, | |
823 | struct mtd_partitions *pparts, | |
824 | struct mtd_part_parser_data *data) | |
825 | { | |
826 | int ret; | |
827 | ||
828 | ret = (*parser->parse_fn)(master, &pparts->parts, data); | |
829 | pr_debug("%s: parser %s: %i\n", master->name, parser->name, ret); | |
830 | if (ret <= 0) | |
831 | return ret; | |
832 | ||
833 | pr_notice("%d %s partitions found on MTD device %s\n", ret, | |
834 | parser->name, master->name); | |
835 | ||
836 | pparts->nr_parts = ret; | |
837 | pparts->parser = parser; | |
838 | ||
839 | return ret; | |
840 | } | |
841 | ||
ad274cec AB |
842 | /** |
843 | * parse_mtd_partitions - parse MTD partitions | |
844 | * @master: the master partition (describes whole MTD device) | |
845 | * @types: names of partition parsers to try or %NULL | |
07fd2f87 | 846 | * @pparts: info about partitions found is returned here |
c7975330 | 847 | * @data: MTD partition parser-specific data |
ad274cec AB |
848 | * |
849 | * This function tries to find partition on MTD device @master. It uses MTD | |
850 | * partition parsers, specified in @types. However, if @types is %NULL, then | |
851 | * the default list of parsers is used. The default list contains only the | |
d26c87d6 | 852 | * "cmdlinepart" and "ofpart" parsers ATM. |
c51803dd HS |
853 | * Note: If there are more then one parser in @types, the kernel only takes the |
854 | * partitions parsed out by the first parser. | |
ad274cec AB |
855 | * |
856 | * This function may return: | |
857 | * o a negative error code in case of failure | |
07fd2f87 | 858 | * o zero otherwise, and @pparts will describe the partitions, number of |
adc83bf8 BN |
859 | * partitions, and the parser which parsed them. Caller must release |
860 | * resources with mtd_part_parser_cleanup() when finished with the returned | |
861 | * data. | |
ad274cec | 862 | */ |
26a47346 | 863 | int parse_mtd_partitions(struct mtd_info *master, const char *const *types, |
07fd2f87 | 864 | struct mtd_partitions *pparts, |
c7975330 | 865 | struct mtd_part_parser_data *data) |
1da177e4 LT |
866 | { |
867 | struct mtd_part_parser *parser; | |
5a2415b0 | 868 | int ret, err = 0; |
97894cda | 869 | |
5c4eefbd DB |
870 | if (!types) |
871 | types = default_mtd_part_types; | |
872 | ||
5a2415b0 | 873 | for ( ; *types; types++) { |
8e2c992b | 874 | pr_debug("%s: parsing partitions %s\n", master->name, *types); |
5531ae48 | 875 | parser = mtd_part_parser_get(*types); |
1da177e4 | 876 | if (!parser && !request_module("%s", *types)) |
5531ae48 | 877 | parser = mtd_part_parser_get(*types); |
8e2c992b MS |
878 | pr_debug("%s: got parser %s\n", master->name, |
879 | parser ? parser->name : NULL); | |
7c802fbd | 880 | if (!parser) |
1da177e4 | 881 | continue; |
01f9c724 BN |
882 | ret = mtd_part_do_parse(parser, master, pparts, data); |
883 | /* Found partitions! */ | |
884 | if (ret > 0) | |
07fd2f87 | 885 | return 0; |
adc83bf8 | 886 | mtd_part_parser_put(parser); |
5a2415b0 BN |
887 | /* |
888 | * Stash the first error we see; only report it if no parser | |
889 | * succeeds | |
890 | */ | |
891 | if (ret < 0 && !err) | |
892 | err = ret; | |
1da177e4 | 893 | } |
5a2415b0 | 894 | return err; |
1da177e4 | 895 | } |
5daa7b21 | 896 | |
adc83bf8 BN |
897 | void mtd_part_parser_cleanup(struct mtd_partitions *parts) |
898 | { | |
899 | const struct mtd_part_parser *parser; | |
900 | ||
901 | if (!parts) | |
902 | return; | |
903 | ||
904 | parser = parts->parser; | |
905 | if (parser) { | |
906 | if (parser->cleanup) | |
907 | parser->cleanup(parts->parts, parts->nr_parts); | |
908 | ||
909 | mtd_part_parser_put(parser); | |
910 | } | |
911 | } | |
912 | ||
5dee4674 | 913 | int mtd_is_partition(const struct mtd_info *mtd) |
5daa7b21 RT |
914 | { |
915 | struct mtd_part *part; | |
a7e93dcd | 916 | int ispart = 0; |
5daa7b21 RT |
917 | |
918 | mutex_lock(&mtd_partitions_mutex); | |
919 | list_for_each_entry(part, &mtd_partitions, list) | |
920 | if (&part->mtd == mtd) { | |
a7e93dcd | 921 | ispart = 1; |
5daa7b21 RT |
922 | break; |
923 | } | |
924 | mutex_unlock(&mtd_partitions_mutex); | |
925 | ||
a7e93dcd | 926 | return ispart; |
5daa7b21 | 927 | } |
a7e93dcd | 928 | EXPORT_SYMBOL_GPL(mtd_is_partition); |
62082e56 RG |
929 | |
930 | /* Returns the size of the entire flash chip */ | |
931 | uint64_t mtd_get_device_size(const struct mtd_info *mtd) | |
932 | { | |
933 | if (!mtd_is_partition(mtd)) | |
934 | return mtd->size; | |
935 | ||
2524534d | 936 | return mtd_to_part(mtd)->master->size; |
62082e56 RG |
937 | } |
938 | EXPORT_SYMBOL_GPL(mtd_get_device_size); |