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> | |
1da177e4 LT |
32 | |
33 | /* Our partition linked list */ | |
34 | static LIST_HEAD(mtd_partitions); | |
35 | ||
36 | /* Our partition node structure */ | |
37 | struct mtd_part { | |
38 | struct mtd_info mtd; | |
39 | struct mtd_info *master; | |
69423d99 | 40 | uint64_t offset; |
1da177e4 | 41 | struct list_head list; |
1da177e4 LT |
42 | }; |
43 | ||
44 | /* | |
45 | * Given a pointer to the MTD object in the mtd_part structure, we can retrieve | |
46 | * the pointer to that structure with this macro. | |
47 | */ | |
48 | #define PART(x) ((struct mtd_part *)(x)) | |
49 | ||
97894cda TG |
50 | |
51 | /* | |
1da177e4 LT |
52 | * MTD methods which simply translate the effective address and pass through |
53 | * to the _real_ device. | |
54 | */ | |
55 | ||
b33a2887 AN |
56 | static int part_read(struct mtd_info *mtd, loff_t from, size_t len, |
57 | size_t *retlen, u_char *buf) | |
1da177e4 LT |
58 | { |
59 | struct mtd_part *part = PART(mtd); | |
d8877f19 | 60 | struct mtd_ecc_stats stats; |
f1a28c02 TG |
61 | int res; |
62 | ||
d8877f19 YK |
63 | stats = part->master->ecc_stats; |
64 | ||
1da177e4 LT |
65 | if (from >= mtd->size) |
66 | len = 0; | |
67 | else if (from + len > mtd->size) | |
68 | len = mtd->size - from; | |
b33a2887 | 69 | res = part->master->read(part->master, from + part->offset, |
9223a456 | 70 | len, retlen, buf); |
f1a28c02 TG |
71 | if (unlikely(res)) { |
72 | if (res == -EUCLEAN) | |
d8877f19 | 73 | mtd->ecc_stats.corrected += part->master->ecc_stats.corrected - stats.corrected; |
f1a28c02 | 74 | if (res == -EBADMSG) |
d8877f19 | 75 | mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed; |
f1a28c02 TG |
76 | } |
77 | return res; | |
1da177e4 LT |
78 | } |
79 | ||
b33a2887 AN |
80 | static int part_point(struct mtd_info *mtd, loff_t from, size_t len, |
81 | size_t *retlen, void **virt, resource_size_t *phys) | |
1da177e4 LT |
82 | { |
83 | struct mtd_part *part = PART(mtd); | |
84 | if (from >= mtd->size) | |
85 | len = 0; | |
86 | else if (from + len > mtd->size) | |
87 | len = mtd->size - from; | |
97894cda | 88 | return part->master->point (part->master, from + part->offset, |
a98889f3 | 89 | len, retlen, virt, phys); |
1da177e4 | 90 | } |
9223a456 | 91 | |
a98889f3 | 92 | static void part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) |
1da177e4 LT |
93 | { |
94 | struct mtd_part *part = PART(mtd); | |
95 | ||
a98889f3 | 96 | 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 | { | |
104 | struct mtd_part *part = PART(mtd); | |
105 | ||
106 | offset += part->offset; | |
107 | return part->master->get_unmapped_area(part->master, len, offset, | |
108 | flags); | |
109 | } | |
110 | ||
8593fbc6 | 111 | static int part_read_oob(struct mtd_info *mtd, loff_t from, |
b33a2887 | 112 | struct mtd_oob_ops *ops) |
1da177e4 LT |
113 | { |
114 | struct mtd_part *part = 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 TG |
121 | res = part->master->read_oob(part->master, from + part->offset, ops); |
122 | ||
123 | if (unlikely(res)) { | |
124 | if (res == -EUCLEAN) | |
125 | mtd->ecc_stats.corrected++; | |
126 | if (res == -EBADMSG) | |
127 | mtd->ecc_stats.failed++; | |
128 | } | |
129 | return res; | |
1da177e4 LT |
130 | } |
131 | ||
b33a2887 AN |
132 | static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from, |
133 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
134 | { |
135 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 136 | return part->master->read_user_prot_reg(part->master, from, |
1da177e4 LT |
137 | len, retlen, buf); |
138 | } | |
139 | ||
b33a2887 AN |
140 | static int part_get_user_prot_info(struct mtd_info *mtd, |
141 | struct otp_info *buf, size_t len) | |
f77814dd NP |
142 | { |
143 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 144 | return part->master->get_user_prot_info(part->master, buf, len); |
f77814dd NP |
145 | } |
146 | ||
b33a2887 AN |
147 | static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, |
148 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
149 | { |
150 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 151 | return part->master->read_fact_prot_reg(part->master, from, |
1da177e4 LT |
152 | len, retlen, buf); |
153 | } | |
154 | ||
b33a2887 AN |
155 | static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf, |
156 | size_t len) | |
f77814dd NP |
157 | { |
158 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 159 | return part->master->get_fact_prot_info(part->master, buf, len); |
f77814dd NP |
160 | } |
161 | ||
b33a2887 AN |
162 | static int part_write(struct mtd_info *mtd, loff_t to, size_t len, |
163 | size_t *retlen, const u_char *buf) | |
1da177e4 LT |
164 | { |
165 | struct mtd_part *part = PART(mtd); | |
166 | if (!(mtd->flags & MTD_WRITEABLE)) | |
167 | return -EROFS; | |
168 | if (to >= mtd->size) | |
169 | len = 0; | |
170 | else if (to + len > mtd->size) | |
171 | len = mtd->size - to; | |
b33a2887 | 172 | return part->master->write(part->master, to + part->offset, |
9223a456 | 173 | len, retlen, buf); |
1da177e4 LT |
174 | } |
175 | ||
b33a2887 AN |
176 | static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len, |
177 | size_t *retlen, const u_char *buf) | |
388bbb09 RP |
178 | { |
179 | struct mtd_part *part = PART(mtd); | |
180 | if (!(mtd->flags & MTD_WRITEABLE)) | |
181 | return -EROFS; | |
182 | if (to >= mtd->size) | |
183 | len = 0; | |
184 | else if (to + len > mtd->size) | |
185 | len = mtd->size - to; | |
b33a2887 | 186 | return part->master->panic_write(part->master, to + part->offset, |
388bbb09 RP |
187 | len, retlen, buf); |
188 | } | |
189 | ||
8593fbc6 | 190 | static int part_write_oob(struct mtd_info *mtd, loff_t to, |
b33a2887 | 191 | struct mtd_oob_ops *ops) |
1da177e4 LT |
192 | { |
193 | struct mtd_part *part = PART(mtd); | |
8593fbc6 | 194 | |
1da177e4 LT |
195 | if (!(mtd->flags & MTD_WRITEABLE)) |
196 | return -EROFS; | |
8593fbc6 | 197 | |
1da177e4 | 198 | if (to >= mtd->size) |
8593fbc6 | 199 | return -EINVAL; |
7014568b | 200 | if (ops->datbuf && to + ops->len > mtd->size) |
8593fbc6 TG |
201 | return -EINVAL; |
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 LT |
207 | { |
208 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 209 | return part->master->write_user_prot_reg(part->master, from, |
1da177e4 LT |
210 | len, retlen, buf); |
211 | } | |
212 | ||
b33a2887 AN |
213 | static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, |
214 | size_t len) | |
f77814dd NP |
215 | { |
216 | struct mtd_part *part = PART(mtd); | |
b33a2887 | 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 LT |
222 | { |
223 | struct mtd_part *part = PART(mtd); | |
224 | if (!(mtd->flags & MTD_WRITEABLE)) | |
225 | return -EROFS; | |
b33a2887 | 226 | return part->master->writev(part->master, vecs, count, |
1da177e4 | 227 | to + part->offset, retlen); |
1da177e4 LT |
228 | } |
229 | ||
b33a2887 | 230 | static int part_erase(struct mtd_info *mtd, struct erase_info *instr) |
1da177e4 LT |
231 | { |
232 | struct mtd_part *part = PART(mtd); | |
233 | int ret; | |
234 | if (!(mtd->flags & MTD_WRITEABLE)) | |
235 | return -EROFS; | |
236 | if (instr->addr >= mtd->size) | |
237 | return -EINVAL; | |
238 | instr->addr += part->offset; | |
239 | ret = part->master->erase(part->master, instr); | |
74641d75 | 240 | if (ret) { |
bb0eb217 | 241 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
74641d75 AH |
242 | instr->fail_addr -= part->offset; |
243 | instr->addr -= part->offset; | |
244 | } | |
1da177e4 LT |
245 | return ret; |
246 | } | |
247 | ||
248 | void mtd_erase_callback(struct erase_info *instr) | |
249 | { | |
250 | if (instr->mtd->erase == part_erase) { | |
251 | struct mtd_part *part = PART(instr->mtd); | |
252 | ||
bb0eb217 | 253 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
1da177e4 LT |
254 | instr->fail_addr -= part->offset; |
255 | instr->addr -= part->offset; | |
256 | } | |
257 | if (instr->callback) | |
258 | instr->callback(instr); | |
259 | } | |
260 | EXPORT_SYMBOL_GPL(mtd_erase_callback); | |
261 | ||
69423d99 | 262 | static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 LT |
263 | { |
264 | struct mtd_part *part = PART(mtd); | |
97894cda | 265 | if ((len + ofs) > mtd->size) |
1da177e4 LT |
266 | return -EINVAL; |
267 | return part->master->lock(part->master, ofs + part->offset, len); | |
268 | } | |
269 | ||
69423d99 | 270 | static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 LT |
271 | { |
272 | struct mtd_part *part = PART(mtd); | |
97894cda | 273 | if ((len + ofs) > mtd->size) |
1da177e4 LT |
274 | return -EINVAL; |
275 | return part->master->unlock(part->master, ofs + part->offset, len); | |
276 | } | |
277 | ||
9938424f RC |
278 | static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
279 | { | |
280 | struct mtd_part *part = PART(mtd); | |
281 | if ((len + ofs) > mtd->size) | |
282 | return -EINVAL; | |
283 | return part->master->is_locked(part->master, ofs + part->offset, len); | |
284 | } | |
285 | ||
1da177e4 LT |
286 | static void part_sync(struct mtd_info *mtd) |
287 | { | |
288 | struct mtd_part *part = PART(mtd); | |
289 | part->master->sync(part->master); | |
290 | } | |
291 | ||
292 | static int part_suspend(struct mtd_info *mtd) | |
293 | { | |
294 | struct mtd_part *part = PART(mtd); | |
295 | return part->master->suspend(part->master); | |
296 | } | |
297 | ||
298 | static void part_resume(struct mtd_info *mtd) | |
299 | { | |
300 | struct mtd_part *part = PART(mtd); | |
301 | part->master->resume(part->master); | |
302 | } | |
303 | ||
b33a2887 | 304 | static int part_block_isbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 LT |
305 | { |
306 | struct mtd_part *part = PART(mtd); | |
307 | if (ofs >= mtd->size) | |
308 | return -EINVAL; | |
309 | ofs += part->offset; | |
310 | return part->master->block_isbad(part->master, ofs); | |
311 | } | |
312 | ||
b33a2887 | 313 | static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 LT |
314 | { |
315 | struct mtd_part *part = PART(mtd); | |
f1a28c02 TG |
316 | int res; |
317 | ||
1da177e4 LT |
318 | if (!(mtd->flags & MTD_WRITEABLE)) |
319 | return -EROFS; | |
320 | if (ofs >= mtd->size) | |
321 | return -EINVAL; | |
322 | ofs += part->offset; | |
f1a28c02 TG |
323 | res = part->master->block_markbad(part->master, ofs); |
324 | if (!res) | |
325 | mtd->ecc_stats.badblocks++; | |
326 | return res; | |
1da177e4 LT |
327 | } |
328 | ||
97894cda TG |
329 | /* |
330 | * This function unregisters and destroy all slave MTD objects which are | |
1da177e4 LT |
331 | * attached to the given master MTD object. |
332 | */ | |
333 | ||
334 | int del_mtd_partitions(struct mtd_info *master) | |
335 | { | |
71a928c0 | 336 | struct mtd_part *slave, *next; |
1da177e4 | 337 | |
71a928c0 | 338 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) |
1da177e4 | 339 | if (slave->master == master) { |
71a928c0 | 340 | list_del(&slave->list); |
b90cf668 | 341 | del_mtd_device(&slave->mtd); |
1da177e4 | 342 | kfree(slave); |
1da177e4 | 343 | } |
1da177e4 LT |
344 | |
345 | return 0; | |
346 | } | |
b33a2887 | 347 | EXPORT_SYMBOL(del_mtd_partitions); |
1da177e4 | 348 | |
7788ba71 AN |
349 | static struct mtd_part *add_one_partition(struct mtd_info *master, |
350 | const struct mtd_partition *part, int partno, | |
69423d99 | 351 | uint64_t cur_offset) |
7788ba71 AN |
352 | { |
353 | struct mtd_part *slave; | |
354 | ||
355 | /* allocate the partition structure */ | |
b33a2887 | 356 | slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
7788ba71 | 357 | if (!slave) { |
b33a2887 | 358 | printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n", |
7788ba71 AN |
359 | master->name); |
360 | del_mtd_partitions(master); | |
361 | return NULL; | |
362 | } | |
363 | list_add(&slave->list, &mtd_partitions); | |
364 | ||
365 | /* set up the MTD object for this partition */ | |
366 | slave->mtd.type = master->type; | |
367 | slave->mtd.flags = master->flags & ~part->mask_flags; | |
368 | slave->mtd.size = part->size; | |
369 | slave->mtd.writesize = master->writesize; | |
370 | slave->mtd.oobsize = master->oobsize; | |
371 | slave->mtd.oobavail = master->oobavail; | |
372 | slave->mtd.subpage_sft = master->subpage_sft; | |
373 | ||
374 | slave->mtd.name = part->name; | |
375 | slave->mtd.owner = master->owner; | |
402d3265 | 376 | slave->mtd.backing_dev_info = master->backing_dev_info; |
7788ba71 | 377 | |
1f24b5a8 DB |
378 | /* NOTE: we don't arrange MTDs as a tree; it'd be error-prone |
379 | * to have the same data be in two different partitions. | |
380 | */ | |
381 | slave->mtd.dev.parent = master->dev.parent; | |
382 | ||
7788ba71 AN |
383 | slave->mtd.read = part_read; |
384 | slave->mtd.write = part_write; | |
385 | ||
386 | if (master->panic_write) | |
387 | slave->mtd.panic_write = part_panic_write; | |
388 | ||
b33a2887 | 389 | if (master->point && master->unpoint) { |
7788ba71 AN |
390 | slave->mtd.point = part_point; |
391 | slave->mtd.unpoint = part_unpoint; | |
392 | } | |
393 | ||
402d3265 DH |
394 | if (master->get_unmapped_area) |
395 | slave->mtd.get_unmapped_area = part_get_unmapped_area; | |
7788ba71 AN |
396 | if (master->read_oob) |
397 | slave->mtd.read_oob = part_read_oob; | |
398 | if (master->write_oob) | |
399 | slave->mtd.write_oob = part_write_oob; | |
b33a2887 | 400 | if (master->read_user_prot_reg) |
7788ba71 | 401 | slave->mtd.read_user_prot_reg = part_read_user_prot_reg; |
b33a2887 | 402 | if (master->read_fact_prot_reg) |
7788ba71 | 403 | slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg; |
b33a2887 | 404 | if (master->write_user_prot_reg) |
7788ba71 | 405 | slave->mtd.write_user_prot_reg = part_write_user_prot_reg; |
b33a2887 | 406 | if (master->lock_user_prot_reg) |
7788ba71 | 407 | slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg; |
b33a2887 | 408 | if (master->get_user_prot_info) |
7788ba71 | 409 | slave->mtd.get_user_prot_info = part_get_user_prot_info; |
b33a2887 | 410 | if (master->get_fact_prot_info) |
7788ba71 AN |
411 | slave->mtd.get_fact_prot_info = part_get_fact_prot_info; |
412 | if (master->sync) | |
413 | slave->mtd.sync = part_sync; | |
4704a784 | 414 | if (!partno && !master->dev.class && master->suspend && master->resume) { |
7788ba71 AN |
415 | slave->mtd.suspend = part_suspend; |
416 | slave->mtd.resume = part_resume; | |
417 | } | |
418 | if (master->writev) | |
419 | slave->mtd.writev = part_writev; | |
420 | if (master->lock) | |
421 | slave->mtd.lock = part_lock; | |
422 | if (master->unlock) | |
423 | slave->mtd.unlock = part_unlock; | |
9938424f RC |
424 | if (master->is_locked) |
425 | slave->mtd.is_locked = part_is_locked; | |
7788ba71 AN |
426 | if (master->block_isbad) |
427 | slave->mtd.block_isbad = part_block_isbad; | |
428 | if (master->block_markbad) | |
429 | slave->mtd.block_markbad = part_block_markbad; | |
430 | slave->mtd.erase = part_erase; | |
431 | slave->master = master; | |
432 | slave->offset = part->offset; | |
7788ba71 AN |
433 | |
434 | if (slave->offset == MTDPART_OFS_APPEND) | |
435 | slave->offset = cur_offset; | |
436 | if (slave->offset == MTDPART_OFS_NXTBLK) { | |
437 | slave->offset = cur_offset; | |
69423d99 | 438 | if (mtd_mod_by_eb(cur_offset, master) != 0) { |
7788ba71 | 439 | /* Round up to next erasesize */ |
69423d99 | 440 | slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize; |
7788ba71 | 441 | printk(KERN_NOTICE "Moving partition %d: " |
69423d99 AH |
442 | "0x%012llx -> 0x%012llx\n", partno, |
443 | (unsigned long long)cur_offset, (unsigned long long)slave->offset); | |
7788ba71 AN |
444 | } |
445 | } | |
446 | if (slave->mtd.size == MTDPART_SIZ_FULL) | |
447 | slave->mtd.size = master->size - slave->offset; | |
448 | ||
69423d99 AH |
449 | printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset, |
450 | (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name); | |
7788ba71 AN |
451 | |
452 | /* let's do some sanity checks */ | |
453 | if (slave->offset >= master->size) { | |
f636ffb4 | 454 | /* let's register it anyway to preserve ordering */ |
7788ba71 AN |
455 | slave->offset = 0; |
456 | slave->mtd.size = 0; | |
b33a2887 | 457 | printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n", |
7788ba71 | 458 | part->name); |
f636ffb4 | 459 | goto out_register; |
7788ba71 AN |
460 | } |
461 | if (slave->offset + slave->mtd.size > master->size) { | |
462 | slave->mtd.size = master->size - slave->offset; | |
69423d99 AH |
463 | printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n", |
464 | part->name, master->name, (unsigned long long)slave->mtd.size); | |
7788ba71 | 465 | } |
b33a2887 | 466 | if (master->numeraseregions > 1) { |
7788ba71 | 467 | /* Deal with variable erase size stuff */ |
6910c136 | 468 | int i, max = master->numeraseregions; |
69423d99 | 469 | u64 end = slave->offset + slave->mtd.size; |
7788ba71 AN |
470 | struct mtd_erase_region_info *regions = master->eraseregions; |
471 | ||
6910c136 AN |
472 | /* Find the first erase regions which is part of this |
473 | * partition. */ | |
474 | for (i = 0; i < max && regions[i].offset <= slave->offset; i++) | |
7788ba71 | 475 | ; |
6910c136 | 476 | /* The loop searched for the region _behind_ the first one */ |
a57ca046 RK |
477 | if (i > 0) |
478 | i--; | |
7788ba71 | 479 | |
6910c136 AN |
480 | /* Pick biggest erasesize */ |
481 | for (; i < max && regions[i].offset < end; i++) { | |
7788ba71 AN |
482 | if (slave->mtd.erasesize < regions[i].erasesize) { |
483 | slave->mtd.erasesize = regions[i].erasesize; | |
484 | } | |
485 | } | |
6910c136 | 486 | BUG_ON(slave->mtd.erasesize == 0); |
7788ba71 AN |
487 | } else { |
488 | /* Single erase size */ | |
489 | slave->mtd.erasesize = master->erasesize; | |
490 | } | |
491 | ||
492 | if ((slave->mtd.flags & MTD_WRITEABLE) && | |
69423d99 | 493 | mtd_mod_by_eb(slave->offset, &slave->mtd)) { |
7788ba71 | 494 | /* Doesn't start on a boundary of major erase size */ |
b33a2887 AN |
495 | /* FIXME: Let it be writable if it is on a boundary of |
496 | * _minor_ erase size though */ | |
7788ba71 | 497 | slave->mtd.flags &= ~MTD_WRITEABLE; |
b33a2887 | 498 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n", |
7788ba71 AN |
499 | part->name); |
500 | } | |
501 | if ((slave->mtd.flags & MTD_WRITEABLE) && | |
69423d99 | 502 | mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) { |
7788ba71 | 503 | slave->mtd.flags &= ~MTD_WRITEABLE; |
b33a2887 | 504 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n", |
7788ba71 AN |
505 | part->name); |
506 | } | |
507 | ||
508 | slave->mtd.ecclayout = master->ecclayout; | |
509 | if (master->block_isbad) { | |
69423d99 | 510 | uint64_t offs = 0; |
7788ba71 | 511 | |
b33a2887 | 512 | while (offs < slave->mtd.size) { |
7788ba71 AN |
513 | if (master->block_isbad(master, |
514 | offs + slave->offset)) | |
515 | slave->mtd.ecc_stats.badblocks++; | |
516 | offs += slave->mtd.erasesize; | |
517 | } | |
518 | } | |
519 | ||
f636ffb4 | 520 | out_register: |
b90cf668 DW |
521 | /* register our partition */ |
522 | add_mtd_device(&slave->mtd); | |
523 | ||
7788ba71 AN |
524 | return slave; |
525 | } | |
526 | ||
1da177e4 LT |
527 | /* |
528 | * This function, given a master MTD object and a partition table, creates | |
529 | * and registers slave MTD objects which are bound to the master according to | |
530 | * the partition definitions. | |
1f24b5a8 DB |
531 | * |
532 | * We don't register the master, or expect the caller to have done so, | |
533 | * for reasons of data integrity. | |
1da177e4 LT |
534 | */ |
535 | ||
97894cda | 536 | int add_mtd_partitions(struct mtd_info *master, |
1da177e4 LT |
537 | const struct mtd_partition *parts, |
538 | int nbparts) | |
539 | { | |
540 | struct mtd_part *slave; | |
69423d99 | 541 | uint64_t cur_offset = 0; |
1da177e4 LT |
542 | int i; |
543 | ||
b33a2887 | 544 | printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); |
1da177e4 LT |
545 | |
546 | for (i = 0; i < nbparts; i++) { | |
7788ba71 AN |
547 | slave = add_one_partition(master, parts + i, i, cur_offset); |
548 | if (!slave) | |
1da177e4 | 549 | return -ENOMEM; |
1da177e4 | 550 | cur_offset = slave->offset + slave->mtd.size; |
1da177e4 LT |
551 | } |
552 | ||
553 | return 0; | |
554 | } | |
1da177e4 | 555 | EXPORT_SYMBOL(add_mtd_partitions); |
1da177e4 LT |
556 | |
557 | static DEFINE_SPINLOCK(part_parser_lock); | |
558 | static LIST_HEAD(part_parsers); | |
559 | ||
560 | static struct mtd_part_parser *get_partition_parser(const char *name) | |
561 | { | |
71a928c0 | 562 | struct mtd_part_parser *p, *ret = NULL; |
1da177e4 | 563 | |
71a928c0 | 564 | spin_lock(&part_parser_lock); |
1da177e4 | 565 | |
71a928c0 | 566 | list_for_each_entry(p, &part_parsers, list) |
1da177e4 LT |
567 | if (!strcmp(p->name, name) && try_module_get(p->owner)) { |
568 | ret = p; | |
569 | break; | |
570 | } | |
71a928c0 | 571 | |
1da177e4 LT |
572 | spin_unlock(&part_parser_lock); |
573 | ||
574 | return ret; | |
575 | } | |
576 | ||
577 | int register_mtd_parser(struct mtd_part_parser *p) | |
578 | { | |
579 | spin_lock(&part_parser_lock); | |
580 | list_add(&p->list, &part_parsers); | |
581 | spin_unlock(&part_parser_lock); | |
582 | ||
583 | return 0; | |
584 | } | |
b33a2887 | 585 | EXPORT_SYMBOL_GPL(register_mtd_parser); |
1da177e4 LT |
586 | |
587 | int deregister_mtd_parser(struct mtd_part_parser *p) | |
588 | { | |
589 | spin_lock(&part_parser_lock); | |
590 | list_del(&p->list); | |
591 | spin_unlock(&part_parser_lock); | |
592 | return 0; | |
593 | } | |
b33a2887 | 594 | EXPORT_SYMBOL_GPL(deregister_mtd_parser); |
1da177e4 | 595 | |
97894cda | 596 | int parse_mtd_partitions(struct mtd_info *master, const char **types, |
1da177e4 LT |
597 | struct mtd_partition **pparts, unsigned long origin) |
598 | { | |
599 | struct mtd_part_parser *parser; | |
600 | int ret = 0; | |
97894cda | 601 | |
1da177e4 LT |
602 | for ( ; ret <= 0 && *types; types++) { |
603 | parser = get_partition_parser(*types); | |
1da177e4 LT |
604 | if (!parser && !request_module("%s", *types)) |
605 | parser = get_partition_parser(*types); | |
1da177e4 LT |
606 | if (!parser) { |
607 | printk(KERN_NOTICE "%s partition parsing not available\n", | |
608 | *types); | |
609 | continue; | |
610 | } | |
611 | ret = (*parser->parse_fn)(master, pparts, origin); | |
612 | if (ret > 0) { | |
97894cda | 613 | printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n", |
1da177e4 LT |
614 | ret, parser->name, master->name); |
615 | } | |
616 | put_partition_parser(parser); | |
617 | } | |
618 | return ret; | |
619 | } | |
1da177e4 | 620 | EXPORT_SYMBOL_GPL(parse_mtd_partitions); |