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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Core registration and callback routines for MTD |
3 | * drivers and users. | |
4 | * | |
a1452a37 DW |
5 | * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
6 | * Copyright © 2006 Red Hat UK Limited | |
7 | * | |
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 | |
21 | * | |
1da177e4 LT |
22 | */ |
23 | ||
1da177e4 LT |
24 | #include <linux/module.h> |
25 | #include <linux/kernel.h> | |
1da177e4 | 26 | #include <linux/ptrace.h> |
447d9bd8 | 27 | #include <linux/seq_file.h> |
1da177e4 LT |
28 | #include <linux/string.h> |
29 | #include <linux/timer.h> | |
30 | #include <linux/major.h> | |
31 | #include <linux/fs.h> | |
7799308f | 32 | #include <linux/err.h> |
1da177e4 LT |
33 | #include <linux/ioctl.h> |
34 | #include <linux/init.h> | |
215a02fd | 35 | #include <linux/of.h> |
1da177e4 | 36 | #include <linux/proc_fs.h> |
b520e412 | 37 | #include <linux/idr.h> |
a33eb6b9 | 38 | #include <linux/backing-dev.h> |
05d71b46 | 39 | #include <linux/gfp.h> |
0d01ff25 | 40 | #include <linux/slab.h> |
3efe41be | 41 | #include <linux/reboot.h> |
fea728c0 | 42 | #include <linux/leds.h> |
e8e3edb9 | 43 | #include <linux/debugfs.h> |
c4dfa25a | 44 | #include <linux/nvmem-provider.h> |
1da177e4 LT |
45 | |
46 | #include <linux/mtd/mtd.h> | |
f5671ab3 | 47 | #include <linux/mtd/partitions.h> |
1da177e4 | 48 | |
356d70f1 | 49 | #include "mtdcore.h" |
660685d9 | 50 | |
fa06052d | 51 | struct backing_dev_info *mtd_bdi; |
356d70f1 | 52 | |
57b8045d LPC |
53 | #ifdef CONFIG_PM_SLEEP |
54 | ||
55 | static int mtd_cls_suspend(struct device *dev) | |
56 | { | |
57 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
58 | ||
59 | return mtd ? mtd_suspend(mtd) : 0; | |
60 | } | |
61 | ||
62 | static int mtd_cls_resume(struct device *dev) | |
63 | { | |
64 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
65 | ||
66 | if (mtd) | |
67 | mtd_resume(mtd); | |
68 | return 0; | |
69 | } | |
70 | ||
71 | static SIMPLE_DEV_PM_OPS(mtd_cls_pm_ops, mtd_cls_suspend, mtd_cls_resume); | |
72 | #define MTD_CLS_PM_OPS (&mtd_cls_pm_ops) | |
73 | #else | |
74 | #define MTD_CLS_PM_OPS NULL | |
75 | #endif | |
15bce40c DW |
76 | |
77 | static struct class mtd_class = { | |
78 | .name = "mtd", | |
79 | .owner = THIS_MODULE, | |
57b8045d | 80 | .pm = MTD_CLS_PM_OPS, |
15bce40c | 81 | }; |
1f24b5a8 | 82 | |
b520e412 BH |
83 | static DEFINE_IDR(mtd_idr); |
84 | ||
97894cda | 85 | /* These are exported solely for the purpose of mtd_blkdevs.c. You |
1da177e4 | 86 | should not use them for _anything_ else */ |
48b19268 | 87 | DEFINE_MUTEX(mtd_table_mutex); |
1da177e4 | 88 | EXPORT_SYMBOL_GPL(mtd_table_mutex); |
b520e412 BH |
89 | |
90 | struct mtd_info *__mtd_next_device(int i) | |
91 | { | |
92 | return idr_get_next(&mtd_idr, &i); | |
93 | } | |
94 | EXPORT_SYMBOL_GPL(__mtd_next_device); | |
1da177e4 LT |
95 | |
96 | static LIST_HEAD(mtd_notifiers); | |
97 | ||
1f24b5a8 | 98 | |
1f24b5a8 | 99 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) |
1f24b5a8 DB |
100 | |
101 | /* REVISIT once MTD uses the driver model better, whoever allocates | |
102 | * the mtd_info will probably want to use the release() hook... | |
103 | */ | |
104 | static void mtd_release(struct device *dev) | |
105 | { | |
5e472128 | 106 | struct mtd_info *mtd = dev_get_drvdata(dev); |
d5de20a9 | 107 | dev_t index = MTD_DEVT(mtd->index); |
1f24b5a8 | 108 | |
5e472128 BN |
109 | /* remove /dev/mtdXro node */ |
110 | device_destroy(&mtd_class, index + 1); | |
15bce40c DW |
111 | } |
112 | ||
1f24b5a8 DB |
113 | static ssize_t mtd_type_show(struct device *dev, |
114 | struct device_attribute *attr, char *buf) | |
115 | { | |
d5de20a9 | 116 | struct mtd_info *mtd = dev_get_drvdata(dev); |
1f24b5a8 DB |
117 | char *type; |
118 | ||
119 | switch (mtd->type) { | |
120 | case MTD_ABSENT: | |
121 | type = "absent"; | |
122 | break; | |
123 | case MTD_RAM: | |
124 | type = "ram"; | |
125 | break; | |
126 | case MTD_ROM: | |
127 | type = "rom"; | |
128 | break; | |
129 | case MTD_NORFLASH: | |
130 | type = "nor"; | |
131 | break; | |
132 | case MTD_NANDFLASH: | |
133 | type = "nand"; | |
134 | break; | |
135 | case MTD_DATAFLASH: | |
136 | type = "dataflash"; | |
137 | break; | |
138 | case MTD_UBIVOLUME: | |
139 | type = "ubi"; | |
140 | break; | |
f4837246 HS |
141 | case MTD_MLCNANDFLASH: |
142 | type = "mlc-nand"; | |
143 | break; | |
1f24b5a8 DB |
144 | default: |
145 | type = "unknown"; | |
146 | } | |
147 | ||
148 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
149 | } | |
694bb7fc KC |
150 | static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); |
151 | ||
152 | static ssize_t mtd_flags_show(struct device *dev, | |
153 | struct device_attribute *attr, char *buf) | |
154 | { | |
d5de20a9 | 155 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
156 | |
157 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); | |
158 | ||
159 | } | |
160 | static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); | |
161 | ||
162 | static ssize_t mtd_size_show(struct device *dev, | |
163 | struct device_attribute *attr, char *buf) | |
164 | { | |
d5de20a9 | 165 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
166 | |
167 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
168 | (unsigned long long)mtd->size); | |
169 | ||
170 | } | |
171 | static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); | |
172 | ||
173 | static ssize_t mtd_erasesize_show(struct device *dev, | |
174 | struct device_attribute *attr, char *buf) | |
175 | { | |
d5de20a9 | 176 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
177 | |
178 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); | |
179 | ||
180 | } | |
181 | static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); | |
182 | ||
183 | static ssize_t mtd_writesize_show(struct device *dev, | |
184 | struct device_attribute *attr, char *buf) | |
185 | { | |
d5de20a9 | 186 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
187 | |
188 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); | |
189 | ||
190 | } | |
191 | static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); | |
192 | ||
e7693548 AB |
193 | static ssize_t mtd_subpagesize_show(struct device *dev, |
194 | struct device_attribute *attr, char *buf) | |
195 | { | |
d5de20a9 | 196 | struct mtd_info *mtd = dev_get_drvdata(dev); |
e7693548 AB |
197 | unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; |
198 | ||
199 | return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize); | |
200 | ||
201 | } | |
202 | static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); | |
203 | ||
694bb7fc KC |
204 | static ssize_t mtd_oobsize_show(struct device *dev, |
205 | struct device_attribute *attr, char *buf) | |
206 | { | |
d5de20a9 | 207 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
208 | |
209 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); | |
210 | ||
211 | } | |
212 | static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); | |
213 | ||
7cc9aa66 XL |
214 | static ssize_t mtd_oobavail_show(struct device *dev, |
215 | struct device_attribute *attr, char *buf) | |
216 | { | |
217 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
218 | ||
219 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->oobavail); | |
220 | } | |
221 | static DEVICE_ATTR(oobavail, S_IRUGO, mtd_oobavail_show, NULL); | |
222 | ||
694bb7fc KC |
223 | static ssize_t mtd_numeraseregions_show(struct device *dev, |
224 | struct device_attribute *attr, char *buf) | |
225 | { | |
d5de20a9 | 226 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
227 | |
228 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); | |
229 | ||
230 | } | |
231 | static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, | |
232 | NULL); | |
233 | ||
234 | static ssize_t mtd_name_show(struct device *dev, | |
235 | struct device_attribute *attr, char *buf) | |
236 | { | |
d5de20a9 | 237 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
238 | |
239 | return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); | |
240 | ||
241 | } | |
242 | static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); | |
1f24b5a8 | 243 | |
a9b672e8 MD |
244 | static ssize_t mtd_ecc_strength_show(struct device *dev, |
245 | struct device_attribute *attr, char *buf) | |
246 | { | |
247 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
248 | ||
249 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_strength); | |
250 | } | |
251 | static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL); | |
252 | ||
d062d4ed MD |
253 | static ssize_t mtd_bitflip_threshold_show(struct device *dev, |
254 | struct device_attribute *attr, | |
255 | char *buf) | |
256 | { | |
257 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
258 | ||
259 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->bitflip_threshold); | |
260 | } | |
261 | ||
262 | static ssize_t mtd_bitflip_threshold_store(struct device *dev, | |
263 | struct device_attribute *attr, | |
264 | const char *buf, size_t count) | |
265 | { | |
266 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
267 | unsigned int bitflip_threshold; | |
268 | int retval; | |
269 | ||
270 | retval = kstrtouint(buf, 0, &bitflip_threshold); | |
271 | if (retval) | |
272 | return retval; | |
273 | ||
274 | mtd->bitflip_threshold = bitflip_threshold; | |
275 | return count; | |
276 | } | |
277 | static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR, | |
278 | mtd_bitflip_threshold_show, | |
279 | mtd_bitflip_threshold_store); | |
280 | ||
bf977e3f HS |
281 | static ssize_t mtd_ecc_step_size_show(struct device *dev, |
282 | struct device_attribute *attr, char *buf) | |
283 | { | |
284 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
285 | ||
286 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_step_size); | |
287 | ||
288 | } | |
289 | static DEVICE_ATTR(ecc_step_size, S_IRUGO, mtd_ecc_step_size_show, NULL); | |
290 | ||
990a3af0 EG |
291 | static ssize_t mtd_ecc_stats_corrected_show(struct device *dev, |
292 | struct device_attribute *attr, char *buf) | |
293 | { | |
294 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
295 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
296 | ||
297 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->corrected); | |
298 | } | |
299 | static DEVICE_ATTR(corrected_bits, S_IRUGO, | |
300 | mtd_ecc_stats_corrected_show, NULL); | |
301 | ||
302 | static ssize_t mtd_ecc_stats_errors_show(struct device *dev, | |
303 | struct device_attribute *attr, char *buf) | |
304 | { | |
305 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
306 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
307 | ||
308 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->failed); | |
309 | } | |
310 | static DEVICE_ATTR(ecc_failures, S_IRUGO, mtd_ecc_stats_errors_show, NULL); | |
311 | ||
312 | static ssize_t mtd_badblocks_show(struct device *dev, | |
313 | struct device_attribute *attr, char *buf) | |
314 | { | |
315 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
316 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
317 | ||
318 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->badblocks); | |
319 | } | |
320 | static DEVICE_ATTR(bad_blocks, S_IRUGO, mtd_badblocks_show, NULL); | |
321 | ||
322 | static ssize_t mtd_bbtblocks_show(struct device *dev, | |
323 | struct device_attribute *attr, char *buf) | |
324 | { | |
325 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
326 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
327 | ||
328 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->bbtblocks); | |
329 | } | |
330 | static DEVICE_ATTR(bbt_blocks, S_IRUGO, mtd_bbtblocks_show, NULL); | |
331 | ||
1f24b5a8 | 332 | static struct attribute *mtd_attrs[] = { |
694bb7fc KC |
333 | &dev_attr_type.attr, |
334 | &dev_attr_flags.attr, | |
335 | &dev_attr_size.attr, | |
336 | &dev_attr_erasesize.attr, | |
337 | &dev_attr_writesize.attr, | |
e7693548 | 338 | &dev_attr_subpagesize.attr, |
694bb7fc | 339 | &dev_attr_oobsize.attr, |
7cc9aa66 | 340 | &dev_attr_oobavail.attr, |
694bb7fc KC |
341 | &dev_attr_numeraseregions.attr, |
342 | &dev_attr_name.attr, | |
a9b672e8 | 343 | &dev_attr_ecc_strength.attr, |
bf977e3f | 344 | &dev_attr_ecc_step_size.attr, |
990a3af0 EG |
345 | &dev_attr_corrected_bits.attr, |
346 | &dev_attr_ecc_failures.attr, | |
347 | &dev_attr_bad_blocks.attr, | |
348 | &dev_attr_bbt_blocks.attr, | |
d062d4ed | 349 | &dev_attr_bitflip_threshold.attr, |
1f24b5a8 DB |
350 | NULL, |
351 | }; | |
54c738f6 | 352 | ATTRIBUTE_GROUPS(mtd); |
1f24b5a8 | 353 | |
75864b30 | 354 | static const struct device_type mtd_devtype = { |
1f24b5a8 DB |
355 | .name = "mtd", |
356 | .groups = mtd_groups, | |
357 | .release = mtd_release, | |
358 | }; | |
359 | ||
b4caecd4 CH |
360 | #ifndef CONFIG_MMU |
361 | unsigned mtd_mmap_capabilities(struct mtd_info *mtd) | |
362 | { | |
363 | switch (mtd->type) { | |
364 | case MTD_RAM: | |
365 | return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | | |
366 | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
367 | case MTD_ROM: | |
368 | return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | | |
369 | NOMMU_MAP_READ; | |
370 | default: | |
371 | return NOMMU_MAP_COPY; | |
372 | } | |
373 | } | |
706a4e5a | 374 | EXPORT_SYMBOL_GPL(mtd_mmap_capabilities); |
b4caecd4 CH |
375 | #endif |
376 | ||
3efe41be BN |
377 | static int mtd_reboot_notifier(struct notifier_block *n, unsigned long state, |
378 | void *cmd) | |
379 | { | |
380 | struct mtd_info *mtd; | |
381 | ||
382 | mtd = container_of(n, struct mtd_info, reboot_notifier); | |
383 | mtd->_reboot(mtd); | |
384 | ||
385 | return NOTIFY_DONE; | |
386 | } | |
387 | ||
477b0229 BB |
388 | /** |
389 | * mtd_wunit_to_pairing_info - get pairing information of a wunit | |
390 | * @mtd: pointer to new MTD device info structure | |
391 | * @wunit: write unit we are interested in | |
392 | * @info: returned pairing information | |
393 | * | |
394 | * Retrieve pairing information associated to the wunit. | |
395 | * This is mainly useful when dealing with MLC/TLC NANDs where pages can be | |
396 | * paired together, and where programming a page may influence the page it is | |
397 | * paired with. | |
398 | * The notion of page is replaced by the term wunit (write-unit) to stay | |
399 | * consistent with the ->writesize field. | |
400 | * | |
401 | * The @wunit argument can be extracted from an absolute offset using | |
402 | * mtd_offset_to_wunit(). @info is filled with the pairing information attached | |
403 | * to @wunit. | |
404 | * | |
405 | * From the pairing info the MTD user can find all the wunits paired with | |
406 | * @wunit using the following loop: | |
407 | * | |
408 | * for (i = 0; i < mtd_pairing_groups(mtd); i++) { | |
409 | * info.pair = i; | |
410 | * mtd_pairing_info_to_wunit(mtd, &info); | |
411 | * ... | |
412 | * } | |
413 | */ | |
414 | int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit, | |
415 | struct mtd_pairing_info *info) | |
416 | { | |
417 | int npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd); | |
418 | ||
419 | if (wunit < 0 || wunit >= npairs) | |
420 | return -EINVAL; | |
421 | ||
422 | if (mtd->pairing && mtd->pairing->get_info) | |
423 | return mtd->pairing->get_info(mtd, wunit, info); | |
424 | ||
425 | info->group = 0; | |
426 | info->pair = wunit; | |
427 | ||
428 | return 0; | |
429 | } | |
430 | EXPORT_SYMBOL_GPL(mtd_wunit_to_pairing_info); | |
431 | ||
432 | /** | |
c77a9312 | 433 | * mtd_pairing_info_to_wunit - get wunit from pairing information |
477b0229 BB |
434 | * @mtd: pointer to new MTD device info structure |
435 | * @info: pairing information struct | |
436 | * | |
437 | * Returns a positive number representing the wunit associated to the info | |
438 | * struct, or a negative error code. | |
439 | * | |
440 | * This is the reverse of mtd_wunit_to_pairing_info(), and can help one to | |
441 | * iterate over all wunits of a given pair (see mtd_wunit_to_pairing_info() | |
442 | * doc). | |
443 | * | |
444 | * It can also be used to only program the first page of each pair (i.e. | |
445 | * page attached to group 0), which allows one to use an MLC NAND in | |
446 | * software-emulated SLC mode: | |
447 | * | |
448 | * info.group = 0; | |
449 | * npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd); | |
450 | * for (info.pair = 0; info.pair < npairs; info.pair++) { | |
451 | * wunit = mtd_pairing_info_to_wunit(mtd, &info); | |
452 | * mtd_write(mtd, mtd_wunit_to_offset(mtd, blkoffs, wunit), | |
453 | * mtd->writesize, &retlen, buf + (i * mtd->writesize)); | |
454 | * } | |
455 | */ | |
456 | int mtd_pairing_info_to_wunit(struct mtd_info *mtd, | |
457 | const struct mtd_pairing_info *info) | |
458 | { | |
459 | int ngroups = mtd_pairing_groups(mtd); | |
460 | int npairs = mtd_wunit_per_eb(mtd) / ngroups; | |
461 | ||
462 | if (!info || info->pair < 0 || info->pair >= npairs || | |
463 | info->group < 0 || info->group >= ngroups) | |
464 | return -EINVAL; | |
465 | ||
466 | if (mtd->pairing && mtd->pairing->get_wunit) | |
467 | return mtd->pairing->get_wunit(mtd, info); | |
468 | ||
469 | return info->pair; | |
470 | } | |
471 | EXPORT_SYMBOL_GPL(mtd_pairing_info_to_wunit); | |
472 | ||
473 | /** | |
474 | * mtd_pairing_groups - get the number of pairing groups | |
475 | * @mtd: pointer to new MTD device info structure | |
476 | * | |
477 | * Returns the number of pairing groups. | |
478 | * | |
479 | * This number is usually equal to the number of bits exposed by a single | |
480 | * cell, and can be used in conjunction with mtd_pairing_info_to_wunit() | |
481 | * to iterate over all pages of a given pair. | |
482 | */ | |
483 | int mtd_pairing_groups(struct mtd_info *mtd) | |
484 | { | |
485 | if (!mtd->pairing || !mtd->pairing->ngroups) | |
486 | return 1; | |
487 | ||
488 | return mtd->pairing->ngroups; | |
489 | } | |
490 | EXPORT_SYMBOL_GPL(mtd_pairing_groups); | |
491 | ||
c4dfa25a AB |
492 | static int mtd_nvmem_reg_read(void *priv, unsigned int offset, |
493 | void *val, size_t bytes) | |
494 | { | |
495 | struct mtd_info *mtd = priv; | |
496 | size_t retlen; | |
497 | int err; | |
498 | ||
499 | err = mtd_read(mtd, offset, bytes, &retlen, val); | |
500 | if (err && err != -EUCLEAN) | |
501 | return err; | |
502 | ||
503 | return retlen == bytes ? 0 : -EIO; | |
504 | } | |
505 | ||
506 | static int mtd_nvmem_add(struct mtd_info *mtd) | |
507 | { | |
508 | struct nvmem_config config = {}; | |
509 | ||
510 | config.dev = &mtd->dev; | |
511 | config.name = mtd->name; | |
512 | config.owner = THIS_MODULE; | |
513 | config.reg_read = mtd_nvmem_reg_read; | |
514 | config.size = mtd->size; | |
515 | config.word_size = 1; | |
516 | config.stride = 1; | |
517 | config.read_only = true; | |
518 | config.root_only = true; | |
519 | config.no_of_node = true; | |
520 | config.priv = mtd; | |
521 | ||
522 | mtd->nvmem = nvmem_register(&config); | |
523 | if (IS_ERR(mtd->nvmem)) { | |
524 | /* Just ignore if there is no NVMEM support in the kernel */ | |
525 | if (PTR_ERR(mtd->nvmem) == -ENOSYS) { | |
526 | mtd->nvmem = NULL; | |
527 | } else { | |
528 | dev_err(&mtd->dev, "Failed to register NVMEM device\n"); | |
529 | return PTR_ERR(mtd->nvmem); | |
530 | } | |
531 | } | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
e8e3edb9 MR |
536 | static struct dentry *dfs_dir_mtd; |
537 | ||
1da177e4 LT |
538 | /** |
539 | * add_mtd_device - register an MTD device | |
540 | * @mtd: pointer to new MTD device info structure | |
541 | * | |
542 | * Add a device to the list of MTD devices present in the system, and | |
543 | * notify each currently active MTD 'user' of its arrival. Returns | |
57dd990c | 544 | * zero on success or non-zero on failure. |
1da177e4 LT |
545 | */ |
546 | ||
547 | int add_mtd_device(struct mtd_info *mtd) | |
548 | { | |
b520e412 BH |
549 | struct mtd_notifier *not; |
550 | int i, error; | |
1da177e4 | 551 | |
be0dbff8 BN |
552 | /* |
553 | * May occur, for instance, on buggy drivers which call | |
554 | * mtd_device_parse_register() multiple times on the same master MTD, | |
555 | * especially with CONFIG_MTD_PARTITIONED_MASTER=y. | |
556 | */ | |
fa06052d | 557 | if (WARN_ONCE(mtd->dev.type, "MTD already registered\n")) |
be0dbff8 BN |
558 | return -EEXIST; |
559 | ||
783ed81f | 560 | BUG_ON(mtd->writesize == 0); |
33f45c44 BB |
561 | |
562 | if (WARN_ON((!mtd->erasesize || !mtd->_erase) && | |
563 | !(mtd->flags & MTD_NO_ERASE))) | |
564 | return -EINVAL; | |
565 | ||
48b19268 | 566 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 567 | |
589e9c4d | 568 | i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL); |
57dd990c BN |
569 | if (i < 0) { |
570 | error = i; | |
b520e412 | 571 | goto fail_locked; |
57dd990c | 572 | } |
1f24b5a8 | 573 | |
b520e412 BH |
574 | mtd->index = i; |
575 | mtd->usecount = 0; | |
576 | ||
d062d4ed MD |
577 | /* default value if not set by driver */ |
578 | if (mtd->bitflip_threshold == 0) | |
579 | mtd->bitflip_threshold = mtd->ecc_strength; | |
580 | ||
b520e412 BH |
581 | if (is_power_of_2(mtd->erasesize)) |
582 | mtd->erasesize_shift = ffs(mtd->erasesize) - 1; | |
583 | else | |
584 | mtd->erasesize_shift = 0; | |
585 | ||
586 | if (is_power_of_2(mtd->writesize)) | |
587 | mtd->writesize_shift = ffs(mtd->writesize) - 1; | |
588 | else | |
589 | mtd->writesize_shift = 0; | |
590 | ||
591 | mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; | |
592 | mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; | |
593 | ||
594 | /* Some chips always power up locked. Unlock them now */ | |
38134565 AB |
595 | if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) { |
596 | error = mtd_unlock(mtd, 0, mtd->size); | |
597 | if (error && error != -EOPNOTSUPP) | |
b520e412 BH |
598 | printk(KERN_WARNING |
599 | "%s: unlock failed, writes may not work\n", | |
600 | mtd->name); | |
57dd990c BN |
601 | /* Ignore unlock failures? */ |
602 | error = 0; | |
b520e412 BH |
603 | } |
604 | ||
605 | /* Caller should have set dev.parent to match the | |
260e89a6 | 606 | * physical device, if appropriate. |
b520e412 BH |
607 | */ |
608 | mtd->dev.type = &mtd_devtype; | |
609 | mtd->dev.class = &mtd_class; | |
610 | mtd->dev.devt = MTD_DEVT(i); | |
611 | dev_set_name(&mtd->dev, "mtd%d", i); | |
612 | dev_set_drvdata(&mtd->dev, mtd); | |
215a02fd | 613 | of_node_get(mtd_get_of_node(mtd)); |
57dd990c BN |
614 | error = device_register(&mtd->dev); |
615 | if (error) | |
b520e412 BH |
616 | goto fail_added; |
617 | ||
c4dfa25a AB |
618 | /* Add the nvmem provider */ |
619 | error = mtd_nvmem_add(mtd); | |
620 | if (error) | |
621 | goto fail_nvmem_add; | |
622 | ||
e8e3edb9 MR |
623 | if (!IS_ERR_OR_NULL(dfs_dir_mtd)) { |
624 | mtd->dbg.dfs_dir = debugfs_create_dir(dev_name(&mtd->dev), dfs_dir_mtd); | |
625 | if (IS_ERR_OR_NULL(mtd->dbg.dfs_dir)) { | |
626 | pr_debug("mtd device %s won't show data in debugfs\n", | |
627 | dev_name(&mtd->dev)); | |
628 | } | |
629 | } | |
630 | ||
5e472128 BN |
631 | device_create(&mtd_class, mtd->dev.parent, MTD_DEVT(i) + 1, NULL, |
632 | "mtd%dro", i); | |
b520e412 | 633 | |
289c0522 | 634 | pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name); |
b520e412 BH |
635 | /* No need to get a refcount on the module containing |
636 | the notifier, since we hold the mtd_table_mutex */ | |
637 | list_for_each_entry(not, &mtd_notifiers, list) | |
638 | not->add(mtd); | |
639 | ||
640 | mutex_unlock(&mtd_table_mutex); | |
641 | /* We _know_ we aren't being removed, because | |
642 | our caller is still holding us here. So none | |
643 | of this try_ nonsense, and no bitching about it | |
644 | either. :) */ | |
645 | __module_get(THIS_MODULE); | |
646 | return 0; | |
97894cda | 647 | |
c4dfa25a AB |
648 | fail_nvmem_add: |
649 | device_unregister(&mtd->dev); | |
b520e412 | 650 | fail_added: |
215a02fd | 651 | of_node_put(mtd_get_of_node(mtd)); |
b520e412 BH |
652 | idr_remove(&mtd_idr, i); |
653 | fail_locked: | |
48b19268 | 654 | mutex_unlock(&mtd_table_mutex); |
57dd990c | 655 | return error; |
1da177e4 LT |
656 | } |
657 | ||
658 | /** | |
659 | * del_mtd_device - unregister an MTD device | |
660 | * @mtd: pointer to MTD device info structure | |
661 | * | |
662 | * Remove a device from the list of MTD devices present in the system, | |
663 | * and notify each currently active MTD 'user' of its departure. | |
664 | * Returns zero on success or 1 on failure, which currently will happen | |
665 | * if the requested device does not appear to be present in the list. | |
666 | */ | |
667 | ||
eea72d5f | 668 | int del_mtd_device(struct mtd_info *mtd) |
1da177e4 LT |
669 | { |
670 | int ret; | |
75c0b84d | 671 | struct mtd_notifier *not; |
97894cda | 672 | |
48b19268 | 673 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 674 | |
e8e3edb9 MR |
675 | debugfs_remove_recursive(mtd->dbg.dfs_dir); |
676 | ||
b520e412 | 677 | if (idr_find(&mtd_idr, mtd->index) != mtd) { |
1da177e4 | 678 | ret = -ENODEV; |
75c0b84d ML |
679 | goto out_error; |
680 | } | |
681 | ||
682 | /* No need to get a refcount on the module containing | |
683 | the notifier, since we hold the mtd_table_mutex */ | |
684 | list_for_each_entry(not, &mtd_notifiers, list) | |
685 | not->remove(mtd); | |
686 | ||
687 | if (mtd->usecount) { | |
97894cda | 688 | printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", |
1da177e4 LT |
689 | mtd->index, mtd->name, mtd->usecount); |
690 | ret = -EBUSY; | |
691 | } else { | |
c4dfa25a AB |
692 | /* Try to remove the NVMEM provider */ |
693 | if (mtd->nvmem) | |
694 | nvmem_unregister(mtd->nvmem); | |
695 | ||
694bb7fc KC |
696 | device_unregister(&mtd->dev); |
697 | ||
b520e412 | 698 | idr_remove(&mtd_idr, mtd->index); |
215a02fd | 699 | of_node_put(mtd_get_of_node(mtd)); |
1da177e4 LT |
700 | |
701 | module_put(THIS_MODULE); | |
702 | ret = 0; | |
703 | } | |
704 | ||
75c0b84d | 705 | out_error: |
48b19268 | 706 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
707 | return ret; |
708 | } | |
709 | ||
472b444e BN |
710 | /* |
711 | * Set a few defaults based on the parent devices, if not provided by the | |
712 | * driver | |
713 | */ | |
714 | static void mtd_set_dev_defaults(struct mtd_info *mtd) | |
715 | { | |
716 | if (mtd->dev.parent) { | |
717 | if (!mtd->owner && mtd->dev.parent->driver) | |
718 | mtd->owner = mtd->dev.parent->driver->owner; | |
719 | if (!mtd->name) | |
720 | mtd->name = dev_name(mtd->dev.parent); | |
721 | } else { | |
722 | pr_debug("mtd device won't show a device symlink in sysfs\n"); | |
723 | } | |
1186af45 RM |
724 | |
725 | mtd->orig_flags = mtd->flags; | |
472b444e | 726 | } |
727dc612 | 727 | |
1c4c215c DES |
728 | /** |
729 | * mtd_device_parse_register - parse partitions and register an MTD device. | |
730 | * | |
731 | * @mtd: the MTD device to register | |
732 | * @types: the list of MTD partition probes to try, see | |
733 | * 'parse_mtd_partitions()' for more information | |
c7975330 | 734 | * @parser_data: MTD partition parser-specific data |
1c4c215c DES |
735 | * @parts: fallback partition information to register, if parsing fails; |
736 | * only valid if %nr_parts > %0 | |
737 | * @nr_parts: the number of partitions in parts, if zero then the full | |
738 | * MTD device is registered if no partition info is found | |
739 | * | |
740 | * This function aggregates MTD partitions parsing (done by | |
741 | * 'parse_mtd_partitions()') and MTD device and partitions registering. It | |
742 | * basically follows the most common pattern found in many MTD drivers: | |
743 | * | |
55a999a0 RM |
744 | * * If the MTD_PARTITIONED_MASTER option is set, then the device as a whole is |
745 | * registered first. | |
746 | * * Then It tries to probe partitions on MTD device @mtd using parsers | |
1c4c215c DES |
747 | * specified in @types (if @types is %NULL, then the default list of parsers |
748 | * is used, see 'parse_mtd_partitions()' for more information). If none are | |
749 | * found this functions tries to fallback to information specified in | |
750 | * @parts/@nr_parts. | |
1c4c215c DES |
751 | * * If no partitions were found this function just registers the MTD device |
752 | * @mtd and exits. | |
753 | * | |
754 | * Returns zero in case of success and a negative error code in case of failure. | |
755 | */ | |
26a47346 | 756 | int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types, |
c7975330 | 757 | struct mtd_part_parser_data *parser_data, |
1c4c215c DES |
758 | const struct mtd_partition *parts, |
759 | int nr_parts) | |
760 | { | |
727dc612 | 761 | int ret; |
1c4c215c | 762 | |
472b444e BN |
763 | mtd_set_dev_defaults(mtd); |
764 | ||
2c77c57d RM |
765 | if (IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) { |
766 | ret = add_mtd_device(mtd); | |
767 | if (ret) | |
768 | return ret; | |
769 | } | |
770 | ||
0dbe4ea7 | 771 | /* Prefer parsed partitions over driver-provided fallback */ |
5ac67ce3 RM |
772 | ret = parse_mtd_partitions(mtd, types, parser_data); |
773 | if (ret > 0) | |
774 | ret = 0; | |
775 | else if (nr_parts) | |
0dbe4ea7 RM |
776 | ret = add_mtd_partitions(mtd, parts, nr_parts); |
777 | else if (!device_is_registered(&mtd->dev)) | |
778 | ret = add_mtd_device(mtd); | |
779 | else | |
780 | ret = 0; | |
781 | ||
3e00ed0e BN |
782 | if (ret) |
783 | goto out; | |
1c4c215c | 784 | |
e1dd8641 NC |
785 | /* |
786 | * FIXME: some drivers unfortunately call this function more than once. | |
787 | * So we have to check if we've already assigned the reboot notifier. | |
788 | * | |
789 | * Generally, we can make multiple calls work for most cases, but it | |
790 | * does cause problems with parse_mtd_partitions() above (e.g., | |
791 | * cmdlineparts will register partitions more than once). | |
792 | */ | |
f8479dd6 BN |
793 | WARN_ONCE(mtd->_reboot && mtd->reboot_notifier.notifier_call, |
794 | "MTD already registered\n"); | |
e1dd8641 | 795 | if (mtd->_reboot && !mtd->reboot_notifier.notifier_call) { |
3efe41be BN |
796 | mtd->reboot_notifier.notifier_call = mtd_reboot_notifier; |
797 | register_reboot_notifier(&mtd->reboot_notifier); | |
798 | } | |
799 | ||
3e00ed0e | 800 | out: |
2c77c57d RM |
801 | if (ret && device_is_registered(&mtd->dev)) |
802 | del_mtd_device(mtd); | |
803 | ||
727dc612 | 804 | return ret; |
1c4c215c DES |
805 | } |
806 | EXPORT_SYMBOL_GPL(mtd_device_parse_register); | |
807 | ||
f5671ab3 JI |
808 | /** |
809 | * mtd_device_unregister - unregister an existing MTD device. | |
810 | * | |
811 | * @master: the MTD device to unregister. This will unregister both the master | |
812 | * and any partitions if registered. | |
813 | */ | |
814 | int mtd_device_unregister(struct mtd_info *master) | |
815 | { | |
816 | int err; | |
817 | ||
3efe41be BN |
818 | if (master->_reboot) |
819 | unregister_reboot_notifier(&master->reboot_notifier); | |
820 | ||
f5671ab3 JI |
821 | err = del_mtd_partitions(master); |
822 | if (err) | |
823 | return err; | |
824 | ||
825 | if (!device_is_registered(&master->dev)) | |
826 | return 0; | |
827 | ||
828 | return del_mtd_device(master); | |
829 | } | |
830 | EXPORT_SYMBOL_GPL(mtd_device_unregister); | |
831 | ||
1da177e4 LT |
832 | /** |
833 | * register_mtd_user - register a 'user' of MTD devices. | |
834 | * @new: pointer to notifier info structure | |
835 | * | |
836 | * Registers a pair of callbacks function to be called upon addition | |
837 | * or removal of MTD devices. Causes the 'add' callback to be immediately | |
838 | * invoked for each MTD device currently present in the system. | |
839 | */ | |
1da177e4 LT |
840 | void register_mtd_user (struct mtd_notifier *new) |
841 | { | |
f1332ba2 | 842 | struct mtd_info *mtd; |
1da177e4 | 843 | |
48b19268 | 844 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
845 | |
846 | list_add(&new->list, &mtd_notifiers); | |
847 | ||
d5ca5129 | 848 | __module_get(THIS_MODULE); |
97894cda | 849 | |
f1332ba2 BH |
850 | mtd_for_each_device(mtd) |
851 | new->add(mtd); | |
1da177e4 | 852 | |
48b19268 | 853 | mutex_unlock(&mtd_table_mutex); |
1da177e4 | 854 | } |
33c87b4a | 855 | EXPORT_SYMBOL_GPL(register_mtd_user); |
1da177e4 LT |
856 | |
857 | /** | |
49450795 AB |
858 | * unregister_mtd_user - unregister a 'user' of MTD devices. |
859 | * @old: pointer to notifier info structure | |
1da177e4 LT |
860 | * |
861 | * Removes a callback function pair from the list of 'users' to be | |
862 | * notified upon addition or removal of MTD devices. Causes the | |
863 | * 'remove' callback to be immediately invoked for each MTD device | |
864 | * currently present in the system. | |
865 | */ | |
1da177e4 LT |
866 | int unregister_mtd_user (struct mtd_notifier *old) |
867 | { | |
f1332ba2 | 868 | struct mtd_info *mtd; |
1da177e4 | 869 | |
48b19268 | 870 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
871 | |
872 | module_put(THIS_MODULE); | |
873 | ||
f1332ba2 BH |
874 | mtd_for_each_device(mtd) |
875 | old->remove(mtd); | |
97894cda | 876 | |
1da177e4 | 877 | list_del(&old->list); |
48b19268 | 878 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
879 | return 0; |
880 | } | |
33c87b4a | 881 | EXPORT_SYMBOL_GPL(unregister_mtd_user); |
1da177e4 LT |
882 | |
883 | /** | |
884 | * get_mtd_device - obtain a validated handle for an MTD device | |
885 | * @mtd: last known address of the required MTD device | |
886 | * @num: internal device number of the required MTD device | |
887 | * | |
888 | * Given a number and NULL address, return the num'th entry in the device | |
889 | * table, if any. Given an address and num == -1, search the device table | |
890 | * for a device with that address and return if it's still present. Given | |
9c74034f AB |
891 | * both, return the num'th driver only if its address matches. Return |
892 | * error code if not. | |
1da177e4 | 893 | */ |
1da177e4 LT |
894 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) |
895 | { | |
f1332ba2 BH |
896 | struct mtd_info *ret = NULL, *other; |
897 | int err = -ENODEV; | |
1da177e4 | 898 | |
48b19268 | 899 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
900 | |
901 | if (num == -1) { | |
f1332ba2 BH |
902 | mtd_for_each_device(other) { |
903 | if (other == mtd) { | |
904 | ret = mtd; | |
905 | break; | |
906 | } | |
907 | } | |
b520e412 BH |
908 | } else if (num >= 0) { |
909 | ret = idr_find(&mtd_idr, num); | |
1da177e4 LT |
910 | if (mtd && mtd != ret) |
911 | ret = NULL; | |
912 | } | |
913 | ||
3bd45657 ML |
914 | if (!ret) { |
915 | ret = ERR_PTR(err); | |
916 | goto out; | |
9fe912ce | 917 | } |
1da177e4 | 918 | |
3bd45657 ML |
919 | err = __get_mtd_device(ret); |
920 | if (err) | |
921 | ret = ERR_PTR(err); | |
922 | out: | |
9c74034f AB |
923 | mutex_unlock(&mtd_table_mutex); |
924 | return ret; | |
3bd45657 | 925 | } |
33c87b4a | 926 | EXPORT_SYMBOL_GPL(get_mtd_device); |
1da177e4 | 927 | |
3bd45657 ML |
928 | |
929 | int __get_mtd_device(struct mtd_info *mtd) | |
930 | { | |
931 | int err; | |
932 | ||
933 | if (!try_module_get(mtd->owner)) | |
934 | return -ENODEV; | |
935 | ||
3c3c10bb AB |
936 | if (mtd->_get_device) { |
937 | err = mtd->_get_device(mtd); | |
3bd45657 ML |
938 | |
939 | if (err) { | |
940 | module_put(mtd->owner); | |
941 | return err; | |
942 | } | |
943 | } | |
944 | mtd->usecount++; | |
945 | return 0; | |
1da177e4 | 946 | } |
33c87b4a | 947 | EXPORT_SYMBOL_GPL(__get_mtd_device); |
1da177e4 | 948 | |
7799308f AB |
949 | /** |
950 | * get_mtd_device_nm - obtain a validated handle for an MTD device by | |
951 | * device name | |
952 | * @name: MTD device name to open | |
953 | * | |
954 | * This function returns MTD device description structure in case of | |
955 | * success and an error code in case of failure. | |
956 | */ | |
7799308f AB |
957 | struct mtd_info *get_mtd_device_nm(const char *name) |
958 | { | |
f1332ba2 BH |
959 | int err = -ENODEV; |
960 | struct mtd_info *mtd = NULL, *other; | |
7799308f AB |
961 | |
962 | mutex_lock(&mtd_table_mutex); | |
963 | ||
f1332ba2 BH |
964 | mtd_for_each_device(other) { |
965 | if (!strcmp(name, other->name)) { | |
966 | mtd = other; | |
7799308f AB |
967 | break; |
968 | } | |
969 | } | |
970 | ||
9fe912ce | 971 | if (!mtd) |
7799308f AB |
972 | goto out_unlock; |
973 | ||
52534f2d WG |
974 | err = __get_mtd_device(mtd); |
975 | if (err) | |
7799308f AB |
976 | goto out_unlock; |
977 | ||
9fe912ce AB |
978 | mutex_unlock(&mtd_table_mutex); |
979 | return mtd; | |
7799308f AB |
980 | |
981 | out_unlock: | |
982 | mutex_unlock(&mtd_table_mutex); | |
9fe912ce | 983 | return ERR_PTR(err); |
7799308f | 984 | } |
33c87b4a | 985 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); |
7799308f | 986 | |
1da177e4 LT |
987 | void put_mtd_device(struct mtd_info *mtd) |
988 | { | |
48b19268 | 989 | mutex_lock(&mtd_table_mutex); |
3bd45657 ML |
990 | __put_mtd_device(mtd); |
991 | mutex_unlock(&mtd_table_mutex); | |
992 | ||
993 | } | |
33c87b4a | 994 | EXPORT_SYMBOL_GPL(put_mtd_device); |
3bd45657 ML |
995 | |
996 | void __put_mtd_device(struct mtd_info *mtd) | |
997 | { | |
998 | --mtd->usecount; | |
999 | BUG_ON(mtd->usecount < 0); | |
1000 | ||
3c3c10bb AB |
1001 | if (mtd->_put_device) |
1002 | mtd->_put_device(mtd); | |
1da177e4 LT |
1003 | |
1004 | module_put(mtd->owner); | |
1005 | } | |
33c87b4a | 1006 | EXPORT_SYMBOL_GPL(__put_mtd_device); |
1da177e4 | 1007 | |
8273a0c9 | 1008 | /* |
884cfd90 BB |
1009 | * Erase is an synchronous operation. Device drivers are epected to return a |
1010 | * negative error code if the operation failed and update instr->fail_addr | |
1011 | * to point the portion that was not properly erased. | |
8273a0c9 AB |
1012 | */ |
1013 | int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) | |
1014 | { | |
c585da9f BB |
1015 | instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; |
1016 | ||
e6e620f0 BB |
1017 | if (!mtd->erasesize || !mtd->_erase) |
1018 | return -ENOTSUPP; | |
1019 | ||
0c2b4e21 | 1020 | if (instr->addr >= mtd->size || instr->len > mtd->size - instr->addr) |
8273a0c9 | 1021 | return -EINVAL; |
664addc2 AB |
1022 | if (!(mtd->flags & MTD_WRITEABLE)) |
1023 | return -EROFS; | |
e6e620f0 | 1024 | |
e7bfb3fd | 1025 | if (!instr->len) |
bcb1d238 | 1026 | return 0; |
e7bfb3fd | 1027 | |
fea728c0 | 1028 | ledtrig_mtd_activity(); |
8273a0c9 AB |
1029 | return mtd->_erase(mtd, instr); |
1030 | } | |
1031 | EXPORT_SYMBOL_GPL(mtd_erase); | |
1032 | ||
1033 | /* | |
1034 | * This stuff for eXecute-In-Place. phys is optional and may be set to NULL. | |
1035 | */ | |
1036 | int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, | |
1037 | void **virt, resource_size_t *phys) | |
1038 | { | |
1039 | *retlen = 0; | |
0dd5235f AB |
1040 | *virt = NULL; |
1041 | if (phys) | |
1042 | *phys = 0; | |
8273a0c9 AB |
1043 | if (!mtd->_point) |
1044 | return -EOPNOTSUPP; | |
0c2b4e21 | 1045 | if (from < 0 || from >= mtd->size || len > mtd->size - from) |
8273a0c9 | 1046 | return -EINVAL; |
bcb1d238 AB |
1047 | if (!len) |
1048 | return 0; | |
8273a0c9 AB |
1049 | return mtd->_point(mtd, from, len, retlen, virt, phys); |
1050 | } | |
1051 | EXPORT_SYMBOL_GPL(mtd_point); | |
1052 | ||
1053 | /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ | |
1054 | int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len) | |
1055 | { | |
b9504247 | 1056 | if (!mtd->_unpoint) |
8273a0c9 | 1057 | return -EOPNOTSUPP; |
0c2b4e21 | 1058 | if (from < 0 || from >= mtd->size || len > mtd->size - from) |
8273a0c9 | 1059 | return -EINVAL; |
bcb1d238 AB |
1060 | if (!len) |
1061 | return 0; | |
8273a0c9 AB |
1062 | return mtd->_unpoint(mtd, from, len); |
1063 | } | |
1064 | EXPORT_SYMBOL_GPL(mtd_unpoint); | |
1065 | ||
1066 | /* | |
1067 | * Allow NOMMU mmap() to directly map the device (if not NULL) | |
1068 | * - return the address to which the offset maps | |
1069 | * - return -ENOSYS to indicate refusal to do the mapping | |
1070 | */ | |
1071 | unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len, | |
1072 | unsigned long offset, unsigned long flags) | |
1073 | { | |
9eaa903c NP |
1074 | size_t retlen; |
1075 | void *virt; | |
1076 | int ret; | |
1077 | ||
1078 | ret = mtd_point(mtd, offset, len, &retlen, &virt, NULL); | |
1079 | if (ret) | |
1080 | return ret; | |
1081 | if (retlen != len) { | |
1082 | mtd_unpoint(mtd, offset, retlen); | |
1083 | return -ENOSYS; | |
1084 | } | |
1085 | return (unsigned long)virt; | |
8273a0c9 AB |
1086 | } |
1087 | EXPORT_SYMBOL_GPL(mtd_get_unmapped_area); | |
1088 | ||
1089 | int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, | |
1090 | u_char *buf) | |
1091 | { | |
edbc4540 | 1092 | int ret_code; |
834247ec | 1093 | *retlen = 0; |
0c2b4e21 | 1094 | if (from < 0 || from >= mtd->size || len > mtd->size - from) |
8273a0c9 | 1095 | return -EINVAL; |
bcb1d238 AB |
1096 | if (!len) |
1097 | return 0; | |
edbc4540 | 1098 | |
fea728c0 | 1099 | ledtrig_mtd_activity(); |
edbc4540 MD |
1100 | /* |
1101 | * In the absence of an error, drivers return a non-negative integer | |
1102 | * representing the maximum number of bitflips that were corrected on | |
1103 | * any one ecc region (if applicable; zero otherwise). | |
1104 | */ | |
24ff1292 BB |
1105 | if (mtd->_read) { |
1106 | ret_code = mtd->_read(mtd, from, len, retlen, buf); | |
1107 | } else if (mtd->_read_oob) { | |
1108 | struct mtd_oob_ops ops = { | |
1109 | .len = len, | |
1110 | .datbuf = buf, | |
1111 | }; | |
1112 | ||
1113 | ret_code = mtd->_read_oob(mtd, from, &ops); | |
1114 | *retlen = ops.retlen; | |
1115 | } else { | |
1116 | return -ENOTSUPP; | |
1117 | } | |
1118 | ||
edbc4540 MD |
1119 | if (unlikely(ret_code < 0)) |
1120 | return ret_code; | |
1121 | if (mtd->ecc_strength == 0) | |
1122 | return 0; /* device lacks ecc */ | |
1123 | return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; | |
8273a0c9 AB |
1124 | } |
1125 | EXPORT_SYMBOL_GPL(mtd_read); | |
1126 | ||
1127 | int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
1128 | const u_char *buf) | |
1129 | { | |
1130 | *retlen = 0; | |
0c2b4e21 | 1131 | if (to < 0 || to >= mtd->size || len > mtd->size - to) |
8273a0c9 | 1132 | return -EINVAL; |
24ff1292 BB |
1133 | if ((!mtd->_write && !mtd->_write_oob) || |
1134 | !(mtd->flags & MTD_WRITEABLE)) | |
664addc2 | 1135 | return -EROFS; |
bcb1d238 AB |
1136 | if (!len) |
1137 | return 0; | |
fea728c0 | 1138 | ledtrig_mtd_activity(); |
24ff1292 BB |
1139 | |
1140 | if (!mtd->_write) { | |
1141 | struct mtd_oob_ops ops = { | |
1142 | .len = len, | |
1143 | .datbuf = (u8 *)buf, | |
1144 | }; | |
1145 | int ret; | |
1146 | ||
1147 | ret = mtd->_write_oob(mtd, to, &ops); | |
1148 | *retlen = ops.retlen; | |
1149 | return ret; | |
1150 | } | |
1151 | ||
8273a0c9 AB |
1152 | return mtd->_write(mtd, to, len, retlen, buf); |
1153 | } | |
1154 | EXPORT_SYMBOL_GPL(mtd_write); | |
1155 | ||
1156 | /* | |
1157 | * In blackbox flight recorder like scenarios we want to make successful writes | |
1158 | * in interrupt context. panic_write() is only intended to be called when its | |
1159 | * known the kernel is about to panic and we need the write to succeed. Since | |
1160 | * the kernel is not going to be running for much longer, this function can | |
1161 | * break locks and delay to ensure the write succeeds (but not sleep). | |
1162 | */ | |
1163 | int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
1164 | const u_char *buf) | |
1165 | { | |
1166 | *retlen = 0; | |
1167 | if (!mtd->_panic_write) | |
1168 | return -EOPNOTSUPP; | |
0c2b4e21 | 1169 | if (to < 0 || to >= mtd->size || len > mtd->size - to) |
8273a0c9 | 1170 | return -EINVAL; |
664addc2 AB |
1171 | if (!(mtd->flags & MTD_WRITEABLE)) |
1172 | return -EROFS; | |
bcb1d238 AB |
1173 | if (!len) |
1174 | return 0; | |
8273a0c9 AB |
1175 | return mtd->_panic_write(mtd, to, len, retlen, buf); |
1176 | } | |
1177 | EXPORT_SYMBOL_GPL(mtd_panic_write); | |
1178 | ||
5cdd929d BB |
1179 | static int mtd_check_oob_ops(struct mtd_info *mtd, loff_t offs, |
1180 | struct mtd_oob_ops *ops) | |
1181 | { | |
1182 | /* | |
1183 | * Some users are setting ->datbuf or ->oobbuf to NULL, but are leaving | |
1184 | * ->len or ->ooblen uninitialized. Force ->len and ->ooblen to 0 in | |
1185 | * this case. | |
1186 | */ | |
1187 | if (!ops->datbuf) | |
1188 | ops->len = 0; | |
1189 | ||
1190 | if (!ops->oobbuf) | |
1191 | ops->ooblen = 0; | |
1192 | ||
d82c3682 | 1193 | if (offs < 0 || offs + ops->len > mtd->size) |
5cdd929d BB |
1194 | return -EINVAL; |
1195 | ||
1196 | if (ops->ooblen) { | |
89f706db | 1197 | size_t maxooblen; |
5cdd929d BB |
1198 | |
1199 | if (ops->ooboffs >= mtd_oobavail(mtd, ops)) | |
1200 | return -EINVAL; | |
1201 | ||
89f706db MR |
1202 | maxooblen = ((size_t)(mtd_div_by_ws(mtd->size, mtd) - |
1203 | mtd_div_by_ws(offs, mtd)) * | |
5cdd929d BB |
1204 | mtd_oobavail(mtd, ops)) - ops->ooboffs; |
1205 | if (ops->ooblen > maxooblen) | |
1206 | return -EINVAL; | |
1207 | } | |
1208 | ||
1209 | return 0; | |
1210 | } | |
1211 | ||
d2d48480 BN |
1212 | int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) |
1213 | { | |
e47f6858 | 1214 | int ret_code; |
d2d48480 | 1215 | ops->retlen = ops->oobretlen = 0; |
fea728c0 | 1216 | |
5cdd929d BB |
1217 | ret_code = mtd_check_oob_ops(mtd, from, ops); |
1218 | if (ret_code) | |
1219 | return ret_code; | |
1220 | ||
fea728c0 | 1221 | ledtrig_mtd_activity(); |
89fd23ef MR |
1222 | |
1223 | /* Check the validity of a potential fallback on mtd->_read */ | |
1224 | if (!mtd->_read_oob && (!mtd->_read || ops->oobbuf)) | |
1225 | return -EOPNOTSUPP; | |
1226 | ||
1227 | if (mtd->_read_oob) | |
1228 | ret_code = mtd->_read_oob(mtd, from, ops); | |
1229 | else | |
1230 | ret_code = mtd->_read(mtd, from, ops->len, &ops->retlen, | |
1231 | ops->datbuf); | |
1232 | ||
e47f6858 BN |
1233 | /* |
1234 | * In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics | |
1235 | * similar to mtd->_read(), returning a non-negative integer | |
1236 | * representing max bitflips. In other cases, mtd->_read_oob() may | |
1237 | * return -EUCLEAN. In all cases, perform similar logic to mtd_read(). | |
1238 | */ | |
e47f6858 BN |
1239 | if (unlikely(ret_code < 0)) |
1240 | return ret_code; | |
1241 | if (mtd->ecc_strength == 0) | |
1242 | return 0; /* device lacks ecc */ | |
1243 | return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; | |
d2d48480 BN |
1244 | } |
1245 | EXPORT_SYMBOL_GPL(mtd_read_oob); | |
1246 | ||
0c034fe3 EG |
1247 | int mtd_write_oob(struct mtd_info *mtd, loff_t to, |
1248 | struct mtd_oob_ops *ops) | |
1249 | { | |
5cdd929d BB |
1250 | int ret; |
1251 | ||
0c034fe3 | 1252 | ops->retlen = ops->oobretlen = 0; |
89fd23ef | 1253 | |
0c034fe3 EG |
1254 | if (!(mtd->flags & MTD_WRITEABLE)) |
1255 | return -EROFS; | |
5cdd929d BB |
1256 | |
1257 | ret = mtd_check_oob_ops(mtd, to, ops); | |
1258 | if (ret) | |
1259 | return ret; | |
1260 | ||
fea728c0 | 1261 | ledtrig_mtd_activity(); |
89fd23ef MR |
1262 | |
1263 | /* Check the validity of a potential fallback on mtd->_write */ | |
1264 | if (!mtd->_write_oob && (!mtd->_write || ops->oobbuf)) | |
1265 | return -EOPNOTSUPP; | |
1266 | ||
1267 | if (mtd->_write_oob) | |
1268 | return mtd->_write_oob(mtd, to, ops); | |
1269 | else | |
1270 | return mtd->_write(mtd, to, ops->len, &ops->retlen, | |
1271 | ops->datbuf); | |
0c034fe3 EG |
1272 | } |
1273 | EXPORT_SYMBOL_GPL(mtd_write_oob); | |
1274 | ||
75eb2cec BB |
1275 | /** |
1276 | * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section | |
1277 | * @mtd: MTD device structure | |
1278 | * @section: ECC section. Depending on the layout you may have all the ECC | |
1279 | * bytes stored in a single contiguous section, or one section | |
1280 | * per ECC chunk (and sometime several sections for a single ECC | |
1281 | * ECC chunk) | |
1282 | * @oobecc: OOB region struct filled with the appropriate ECC position | |
1283 | * information | |
1284 | * | |
7da0fffb | 1285 | * This function returns ECC section information in the OOB area. If you want |
75eb2cec BB |
1286 | * to get all the ECC bytes information, then you should call |
1287 | * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE. | |
1288 | * | |
1289 | * Returns zero on success, a negative error code otherwise. | |
1290 | */ | |
1291 | int mtd_ooblayout_ecc(struct mtd_info *mtd, int section, | |
1292 | struct mtd_oob_region *oobecc) | |
1293 | { | |
75eb2cec BB |
1294 | memset(oobecc, 0, sizeof(*oobecc)); |
1295 | ||
1296 | if (!mtd || section < 0) | |
1297 | return -EINVAL; | |
1298 | ||
adbbc3bc | 1299 | if (!mtd->ooblayout || !mtd->ooblayout->ecc) |
75eb2cec BB |
1300 | return -ENOTSUPP; |
1301 | ||
adbbc3bc | 1302 | return mtd->ooblayout->ecc(mtd, section, oobecc); |
75eb2cec BB |
1303 | } |
1304 | EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc); | |
1305 | ||
1306 | /** | |
1307 | * mtd_ooblayout_free - Get the OOB region definition of a specific free | |
1308 | * section | |
1309 | * @mtd: MTD device structure | |
1310 | * @section: Free section you are interested in. Depending on the layout | |
1311 | * you may have all the free bytes stored in a single contiguous | |
1312 | * section, or one section per ECC chunk plus an extra section | |
1313 | * for the remaining bytes (or other funky layout). | |
1314 | * @oobfree: OOB region struct filled with the appropriate free position | |
1315 | * information | |
1316 | * | |
7da0fffb | 1317 | * This function returns free bytes position in the OOB area. If you want |
75eb2cec BB |
1318 | * to get all the free bytes information, then you should call |
1319 | * mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE. | |
1320 | * | |
1321 | * Returns zero on success, a negative error code otherwise. | |
1322 | */ | |
1323 | int mtd_ooblayout_free(struct mtd_info *mtd, int section, | |
1324 | struct mtd_oob_region *oobfree) | |
1325 | { | |
1326 | memset(oobfree, 0, sizeof(*oobfree)); | |
1327 | ||
1328 | if (!mtd || section < 0) | |
1329 | return -EINVAL; | |
1330 | ||
adbbc3bc | 1331 | if (!mtd->ooblayout || !mtd->ooblayout->free) |
75eb2cec BB |
1332 | return -ENOTSUPP; |
1333 | ||
adbbc3bc | 1334 | return mtd->ooblayout->free(mtd, section, oobfree); |
75eb2cec BB |
1335 | } |
1336 | EXPORT_SYMBOL_GPL(mtd_ooblayout_free); | |
1337 | ||
1338 | /** | |
1339 | * mtd_ooblayout_find_region - Find the region attached to a specific byte | |
1340 | * @mtd: mtd info structure | |
1341 | * @byte: the byte we are searching for | |
1342 | * @sectionp: pointer where the section id will be stored | |
1343 | * @oobregion: used to retrieve the ECC position | |
1344 | * @iter: iterator function. Should be either mtd_ooblayout_free or | |
1345 | * mtd_ooblayout_ecc depending on the region type you're searching for | |
1346 | * | |
7da0fffb | 1347 | * This function returns the section id and oobregion information of a |
75eb2cec BB |
1348 | * specific byte. For example, say you want to know where the 4th ECC byte is |
1349 | * stored, you'll use: | |
1350 | * | |
1351 | * mtd_ooblayout_find_region(mtd, 3, §ion, &oobregion, mtd_ooblayout_ecc); | |
1352 | * | |
1353 | * Returns zero on success, a negative error code otherwise. | |
1354 | */ | |
1355 | static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte, | |
1356 | int *sectionp, struct mtd_oob_region *oobregion, | |
1357 | int (*iter)(struct mtd_info *, | |
1358 | int section, | |
1359 | struct mtd_oob_region *oobregion)) | |
1360 | { | |
1361 | int pos = 0, ret, section = 0; | |
1362 | ||
1363 | memset(oobregion, 0, sizeof(*oobregion)); | |
1364 | ||
1365 | while (1) { | |
1366 | ret = iter(mtd, section, oobregion); | |
1367 | if (ret) | |
1368 | return ret; | |
1369 | ||
1370 | if (pos + oobregion->length > byte) | |
1371 | break; | |
1372 | ||
1373 | pos += oobregion->length; | |
1374 | section++; | |
1375 | } | |
1376 | ||
1377 | /* | |
1378 | * Adjust region info to make it start at the beginning at the | |
1379 | * 'start' ECC byte. | |
1380 | */ | |
1381 | oobregion->offset += byte - pos; | |
1382 | oobregion->length -= byte - pos; | |
1383 | *sectionp = section; | |
1384 | ||
1385 | return 0; | |
1386 | } | |
1387 | ||
1388 | /** | |
1389 | * mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific | |
1390 | * ECC byte | |
1391 | * @mtd: mtd info structure | |
1392 | * @eccbyte: the byte we are searching for | |
1393 | * @sectionp: pointer where the section id will be stored | |
1394 | * @oobregion: OOB region information | |
1395 | * | |
1396 | * Works like mtd_ooblayout_find_region() except it searches for a specific ECC | |
1397 | * byte. | |
1398 | * | |
1399 | * Returns zero on success, a negative error code otherwise. | |
1400 | */ | |
1401 | int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte, | |
1402 | int *section, | |
1403 | struct mtd_oob_region *oobregion) | |
1404 | { | |
1405 | return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion, | |
1406 | mtd_ooblayout_ecc); | |
1407 | } | |
1408 | EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion); | |
1409 | ||
1410 | /** | |
1411 | * mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer | |
1412 | * @mtd: mtd info structure | |
1413 | * @buf: destination buffer to store OOB bytes | |
1414 | * @oobbuf: OOB buffer | |
1415 | * @start: first byte to retrieve | |
1416 | * @nbytes: number of bytes to retrieve | |
1417 | * @iter: section iterator | |
1418 | * | |
1419 | * Extract bytes attached to a specific category (ECC or free) | |
1420 | * from the OOB buffer and copy them into buf. | |
1421 | * | |
1422 | * Returns zero on success, a negative error code otherwise. | |
1423 | */ | |
1424 | static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf, | |
1425 | const u8 *oobbuf, int start, int nbytes, | |
1426 | int (*iter)(struct mtd_info *, | |
1427 | int section, | |
1428 | struct mtd_oob_region *oobregion)) | |
1429 | { | |
8e8fd4d1 MY |
1430 | struct mtd_oob_region oobregion; |
1431 | int section, ret; | |
75eb2cec BB |
1432 | |
1433 | ret = mtd_ooblayout_find_region(mtd, start, §ion, | |
1434 | &oobregion, iter); | |
1435 | ||
1436 | while (!ret) { | |
1437 | int cnt; | |
1438 | ||
7c295ef9 | 1439 | cnt = min_t(int, nbytes, oobregion.length); |
75eb2cec BB |
1440 | memcpy(buf, oobbuf + oobregion.offset, cnt); |
1441 | buf += cnt; | |
1442 | nbytes -= cnt; | |
1443 | ||
1444 | if (!nbytes) | |
1445 | break; | |
1446 | ||
1447 | ret = iter(mtd, ++section, &oobregion); | |
1448 | } | |
1449 | ||
1450 | return ret; | |
1451 | } | |
1452 | ||
1453 | /** | |
1454 | * mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer | |
1455 | * @mtd: mtd info structure | |
1456 | * @buf: source buffer to get OOB bytes from | |
1457 | * @oobbuf: OOB buffer | |
1458 | * @start: first OOB byte to set | |
1459 | * @nbytes: number of OOB bytes to set | |
1460 | * @iter: section iterator | |
1461 | * | |
1462 | * Fill the OOB buffer with data provided in buf. The category (ECC or free) | |
1463 | * is selected by passing the appropriate iterator. | |
1464 | * | |
1465 | * Returns zero on success, a negative error code otherwise. | |
1466 | */ | |
1467 | static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf, | |
1468 | u8 *oobbuf, int start, int nbytes, | |
1469 | int (*iter)(struct mtd_info *, | |
1470 | int section, | |
1471 | struct mtd_oob_region *oobregion)) | |
1472 | { | |
8e8fd4d1 MY |
1473 | struct mtd_oob_region oobregion; |
1474 | int section, ret; | |
75eb2cec BB |
1475 | |
1476 | ret = mtd_ooblayout_find_region(mtd, start, §ion, | |
1477 | &oobregion, iter); | |
1478 | ||
1479 | while (!ret) { | |
1480 | int cnt; | |
1481 | ||
7c295ef9 | 1482 | cnt = min_t(int, nbytes, oobregion.length); |
75eb2cec BB |
1483 | memcpy(oobbuf + oobregion.offset, buf, cnt); |
1484 | buf += cnt; | |
1485 | nbytes -= cnt; | |
1486 | ||
1487 | if (!nbytes) | |
1488 | break; | |
1489 | ||
1490 | ret = iter(mtd, ++section, &oobregion); | |
1491 | } | |
1492 | ||
1493 | return ret; | |
1494 | } | |
1495 | ||
1496 | /** | |
1497 | * mtd_ooblayout_count_bytes - count the number of bytes in a OOB category | |
1498 | * @mtd: mtd info structure | |
1499 | * @iter: category iterator | |
1500 | * | |
1501 | * Count the number of bytes in a given category. | |
1502 | * | |
1503 | * Returns a positive value on success, a negative error code otherwise. | |
1504 | */ | |
1505 | static int mtd_ooblayout_count_bytes(struct mtd_info *mtd, | |
1506 | int (*iter)(struct mtd_info *, | |
1507 | int section, | |
1508 | struct mtd_oob_region *oobregion)) | |
1509 | { | |
4d6aecfb | 1510 | struct mtd_oob_region oobregion; |
75eb2cec BB |
1511 | int section = 0, ret, nbytes = 0; |
1512 | ||
1513 | while (1) { | |
1514 | ret = iter(mtd, section++, &oobregion); | |
1515 | if (ret) { | |
1516 | if (ret == -ERANGE) | |
1517 | ret = nbytes; | |
1518 | break; | |
1519 | } | |
1520 | ||
1521 | nbytes += oobregion.length; | |
1522 | } | |
1523 | ||
1524 | return ret; | |
1525 | } | |
1526 | ||
1527 | /** | |
1528 | * mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer | |
1529 | * @mtd: mtd info structure | |
1530 | * @eccbuf: destination buffer to store ECC bytes | |
1531 | * @oobbuf: OOB buffer | |
1532 | * @start: first ECC byte to retrieve | |
1533 | * @nbytes: number of ECC bytes to retrieve | |
1534 | * | |
1535 | * Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes. | |
1536 | * | |
1537 | * Returns zero on success, a negative error code otherwise. | |
1538 | */ | |
1539 | int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf, | |
1540 | const u8 *oobbuf, int start, int nbytes) | |
1541 | { | |
1542 | return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes, | |
1543 | mtd_ooblayout_ecc); | |
1544 | } | |
1545 | EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes); | |
1546 | ||
1547 | /** | |
1548 | * mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer | |
1549 | * @mtd: mtd info structure | |
1550 | * @eccbuf: source buffer to get ECC bytes from | |
1551 | * @oobbuf: OOB buffer | |
1552 | * @start: first ECC byte to set | |
1553 | * @nbytes: number of ECC bytes to set | |
1554 | * | |
1555 | * Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes. | |
1556 | * | |
1557 | * Returns zero on success, a negative error code otherwise. | |
1558 | */ | |
1559 | int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf, | |
1560 | u8 *oobbuf, int start, int nbytes) | |
1561 | { | |
1562 | return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes, | |
1563 | mtd_ooblayout_ecc); | |
1564 | } | |
1565 | EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes); | |
1566 | ||
1567 | /** | |
1568 | * mtd_ooblayout_get_databytes - extract data bytes from the oob buffer | |
1569 | * @mtd: mtd info structure | |
1570 | * @databuf: destination buffer to store ECC bytes | |
1571 | * @oobbuf: OOB buffer | |
1572 | * @start: first ECC byte to retrieve | |
1573 | * @nbytes: number of ECC bytes to retrieve | |
1574 | * | |
1575 | * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. | |
1576 | * | |
1577 | * Returns zero on success, a negative error code otherwise. | |
1578 | */ | |
1579 | int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf, | |
1580 | const u8 *oobbuf, int start, int nbytes) | |
1581 | { | |
1582 | return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes, | |
1583 | mtd_ooblayout_free); | |
1584 | } | |
1585 | EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes); | |
1586 | ||
1587 | /** | |
c77a9312 | 1588 | * mtd_ooblayout_set_databytes - set data bytes into the oob buffer |
75eb2cec | 1589 | * @mtd: mtd info structure |
c77a9312 | 1590 | * @databuf: source buffer to get data bytes from |
75eb2cec BB |
1591 | * @oobbuf: OOB buffer |
1592 | * @start: first ECC byte to set | |
1593 | * @nbytes: number of ECC bytes to set | |
1594 | * | |
1595 | * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. | |
1596 | * | |
1597 | * Returns zero on success, a negative error code otherwise. | |
1598 | */ | |
1599 | int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf, | |
1600 | u8 *oobbuf, int start, int nbytes) | |
1601 | { | |
1602 | return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes, | |
1603 | mtd_ooblayout_free); | |
1604 | } | |
1605 | EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes); | |
1606 | ||
1607 | /** | |
1608 | * mtd_ooblayout_count_freebytes - count the number of free bytes in OOB | |
1609 | * @mtd: mtd info structure | |
1610 | * | |
1611 | * Works like mtd_ooblayout_count_bytes(), except it count free bytes. | |
1612 | * | |
1613 | * Returns zero on success, a negative error code otherwise. | |
1614 | */ | |
1615 | int mtd_ooblayout_count_freebytes(struct mtd_info *mtd) | |
1616 | { | |
1617 | return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free); | |
1618 | } | |
1619 | EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes); | |
1620 | ||
1621 | /** | |
c77a9312 | 1622 | * mtd_ooblayout_count_eccbytes - count the number of ECC bytes in OOB |
75eb2cec BB |
1623 | * @mtd: mtd info structure |
1624 | * | |
1625 | * Works like mtd_ooblayout_count_bytes(), except it count ECC bytes. | |
1626 | * | |
1627 | * Returns zero on success, a negative error code otherwise. | |
1628 | */ | |
1629 | int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd) | |
1630 | { | |
1631 | return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc); | |
1632 | } | |
1633 | EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes); | |
1634 | ||
de3cac93 AB |
1635 | /* |
1636 | * Method to access the protection register area, present in some flash | |
1637 | * devices. The user data is one time programmable but the factory data is read | |
1638 | * only. | |
1639 | */ | |
4b78fc42 CR |
1640 | int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, |
1641 | struct otp_info *buf) | |
de3cac93 AB |
1642 | { |
1643 | if (!mtd->_get_fact_prot_info) | |
1644 | return -EOPNOTSUPP; | |
1645 | if (!len) | |
1646 | return 0; | |
4b78fc42 | 1647 | return mtd->_get_fact_prot_info(mtd, len, retlen, buf); |
de3cac93 AB |
1648 | } |
1649 | EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info); | |
1650 | ||
1651 | int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
1652 | size_t *retlen, u_char *buf) | |
1653 | { | |
1654 | *retlen = 0; | |
1655 | if (!mtd->_read_fact_prot_reg) | |
1656 | return -EOPNOTSUPP; | |
1657 | if (!len) | |
1658 | return 0; | |
1659 | return mtd->_read_fact_prot_reg(mtd, from, len, retlen, buf); | |
1660 | } | |
1661 | EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg); | |
1662 | ||
4b78fc42 CR |
1663 | int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, |
1664 | struct otp_info *buf) | |
de3cac93 AB |
1665 | { |
1666 | if (!mtd->_get_user_prot_info) | |
1667 | return -EOPNOTSUPP; | |
1668 | if (!len) | |
1669 | return 0; | |
4b78fc42 | 1670 | return mtd->_get_user_prot_info(mtd, len, retlen, buf); |
de3cac93 AB |
1671 | } |
1672 | EXPORT_SYMBOL_GPL(mtd_get_user_prot_info); | |
1673 | ||
1674 | int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
1675 | size_t *retlen, u_char *buf) | |
1676 | { | |
1677 | *retlen = 0; | |
1678 | if (!mtd->_read_user_prot_reg) | |
1679 | return -EOPNOTSUPP; | |
1680 | if (!len) | |
1681 | return 0; | |
1682 | return mtd->_read_user_prot_reg(mtd, from, len, retlen, buf); | |
1683 | } | |
1684 | EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg); | |
1685 | ||
1686 | int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len, | |
1687 | size_t *retlen, u_char *buf) | |
1688 | { | |
9a78bc83 CR |
1689 | int ret; |
1690 | ||
de3cac93 AB |
1691 | *retlen = 0; |
1692 | if (!mtd->_write_user_prot_reg) | |
1693 | return -EOPNOTSUPP; | |
1694 | if (!len) | |
1695 | return 0; | |
9a78bc83 CR |
1696 | ret = mtd->_write_user_prot_reg(mtd, to, len, retlen, buf); |
1697 | if (ret) | |
1698 | return ret; | |
1699 | ||
1700 | /* | |
1701 | * If no data could be written at all, we are out of memory and | |
1702 | * must return -ENOSPC. | |
1703 | */ | |
1704 | return (*retlen) ? 0 : -ENOSPC; | |
de3cac93 AB |
1705 | } |
1706 | EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg); | |
1707 | ||
1708 | int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) | |
1709 | { | |
1710 | if (!mtd->_lock_user_prot_reg) | |
1711 | return -EOPNOTSUPP; | |
1712 | if (!len) | |
1713 | return 0; | |
1714 | return mtd->_lock_user_prot_reg(mtd, from, len); | |
1715 | } | |
1716 | EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg); | |
1717 | ||
8273a0c9 AB |
1718 | /* Chip-supported device locking */ |
1719 | int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
1720 | { | |
1721 | if (!mtd->_lock) | |
1722 | return -EOPNOTSUPP; | |
0c2b4e21 | 1723 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c9 | 1724 | return -EINVAL; |
bcb1d238 AB |
1725 | if (!len) |
1726 | return 0; | |
8273a0c9 AB |
1727 | return mtd->_lock(mtd, ofs, len); |
1728 | } | |
1729 | EXPORT_SYMBOL_GPL(mtd_lock); | |
1730 | ||
1731 | int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
1732 | { | |
1733 | if (!mtd->_unlock) | |
1734 | return -EOPNOTSUPP; | |
0c2b4e21 | 1735 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c9 | 1736 | return -EINVAL; |
bcb1d238 AB |
1737 | if (!len) |
1738 | return 0; | |
8273a0c9 AB |
1739 | return mtd->_unlock(mtd, ofs, len); |
1740 | } | |
1741 | EXPORT_SYMBOL_GPL(mtd_unlock); | |
1742 | ||
1743 | int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
1744 | { | |
1745 | if (!mtd->_is_locked) | |
1746 | return -EOPNOTSUPP; | |
0c2b4e21 | 1747 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c9 | 1748 | return -EINVAL; |
bcb1d238 AB |
1749 | if (!len) |
1750 | return 0; | |
8273a0c9 AB |
1751 | return mtd->_is_locked(mtd, ofs, len); |
1752 | } | |
1753 | EXPORT_SYMBOL_GPL(mtd_is_locked); | |
1754 | ||
8471bb73 | 1755 | int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs) |
8273a0c9 | 1756 | { |
0c2b4e21 | 1757 | if (ofs < 0 || ofs >= mtd->size) |
8471bb73 EG |
1758 | return -EINVAL; |
1759 | if (!mtd->_block_isreserved) | |
8273a0c9 | 1760 | return 0; |
8471bb73 EG |
1761 | return mtd->_block_isreserved(mtd, ofs); |
1762 | } | |
1763 | EXPORT_SYMBOL_GPL(mtd_block_isreserved); | |
1764 | ||
1765 | int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs) | |
1766 | { | |
0c2b4e21 | 1767 | if (ofs < 0 || ofs >= mtd->size) |
8273a0c9 | 1768 | return -EINVAL; |
8471bb73 EG |
1769 | if (!mtd->_block_isbad) |
1770 | return 0; | |
8273a0c9 AB |
1771 | return mtd->_block_isbad(mtd, ofs); |
1772 | } | |
1773 | EXPORT_SYMBOL_GPL(mtd_block_isbad); | |
1774 | ||
1775 | int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs) | |
1776 | { | |
1777 | if (!mtd->_block_markbad) | |
1778 | return -EOPNOTSUPP; | |
0c2b4e21 | 1779 | if (ofs < 0 || ofs >= mtd->size) |
8273a0c9 | 1780 | return -EINVAL; |
664addc2 AB |
1781 | if (!(mtd->flags & MTD_WRITEABLE)) |
1782 | return -EROFS; | |
8273a0c9 AB |
1783 | return mtd->_block_markbad(mtd, ofs); |
1784 | } | |
1785 | EXPORT_SYMBOL_GPL(mtd_block_markbad); | |
1786 | ||
52b02031 AB |
1787 | /* |
1788 | * default_mtd_writev - the default writev method | |
1789 | * @mtd: mtd device description object pointer | |
1790 | * @vecs: the vectors to write | |
1791 | * @count: count of vectors in @vecs | |
1792 | * @to: the MTD device offset to write to | |
1793 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
1794 | * | |
1795 | * This function returns zero in case of success and a negative error code in | |
1796 | * case of failure. | |
1da177e4 | 1797 | */ |
1dbebd32 AB |
1798 | static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, |
1799 | unsigned long count, loff_t to, size_t *retlen) | |
1da177e4 LT |
1800 | { |
1801 | unsigned long i; | |
1802 | size_t totlen = 0, thislen; | |
1803 | int ret = 0; | |
1804 | ||
52b02031 AB |
1805 | for (i = 0; i < count; i++) { |
1806 | if (!vecs[i].iov_len) | |
1807 | continue; | |
1808 | ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen, | |
1809 | vecs[i].iov_base); | |
1810 | totlen += thislen; | |
1811 | if (ret || thislen != vecs[i].iov_len) | |
1812 | break; | |
1813 | to += vecs[i].iov_len; | |
1da177e4 | 1814 | } |
52b02031 | 1815 | *retlen = totlen; |
1da177e4 LT |
1816 | return ret; |
1817 | } | |
1dbebd32 AB |
1818 | |
1819 | /* | |
1820 | * mtd_writev - the vector-based MTD write method | |
1821 | * @mtd: mtd device description object pointer | |
1822 | * @vecs: the vectors to write | |
1823 | * @count: count of vectors in @vecs | |
1824 | * @to: the MTD device offset to write to | |
1825 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
1826 | * | |
1827 | * This function returns zero in case of success and a negative error code in | |
1828 | * case of failure. | |
1829 | */ | |
1830 | int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
1831 | unsigned long count, loff_t to, size_t *retlen) | |
1832 | { | |
1833 | *retlen = 0; | |
664addc2 AB |
1834 | if (!(mtd->flags & MTD_WRITEABLE)) |
1835 | return -EROFS; | |
3c3c10bb | 1836 | if (!mtd->_writev) |
1dbebd32 | 1837 | return default_mtd_writev(mtd, vecs, count, to, retlen); |
3c3c10bb | 1838 | return mtd->_writev(mtd, vecs, count, to, retlen); |
1dbebd32 AB |
1839 | } |
1840 | EXPORT_SYMBOL_GPL(mtd_writev); | |
1da177e4 | 1841 | |
33b53716 GE |
1842 | /** |
1843 | * mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size | |
52b02031 AB |
1844 | * @mtd: mtd device description object pointer |
1845 | * @size: a pointer to the ideal or maximum size of the allocation, points | |
33b53716 GE |
1846 | * to the actual allocation size on success. |
1847 | * | |
1848 | * This routine attempts to allocate a contiguous kernel buffer up to | |
1849 | * the specified size, backing off the size of the request exponentially | |
1850 | * until the request succeeds or until the allocation size falls below | |
1851 | * the system page size. This attempts to make sure it does not adversely | |
1852 | * impact system performance, so when allocating more than one page, we | |
caf49191 LT |
1853 | * ask the memory allocator to avoid re-trying, swapping, writing back |
1854 | * or performing I/O. | |
33b53716 GE |
1855 | * |
1856 | * Note, this function also makes sure that the allocated buffer is aligned to | |
1857 | * the MTD device's min. I/O unit, i.e. the "mtd->writesize" value. | |
1858 | * | |
1859 | * This is called, for example by mtd_{read,write} and jffs2_scan_medium, | |
1860 | * to handle smaller (i.e. degraded) buffer allocations under low- or | |
1861 | * fragmented-memory situations where such reduced allocations, from a | |
1862 | * requested ideal, are allowed. | |
1863 | * | |
1864 | * Returns a pointer to the allocated buffer on success; otherwise, NULL. | |
1865 | */ | |
1866 | void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size) | |
1867 | { | |
d0164adc | 1868 | gfp_t flags = __GFP_NOWARN | __GFP_DIRECT_RECLAIM | __GFP_NORETRY; |
33b53716 GE |
1869 | size_t min_alloc = max_t(size_t, mtd->writesize, PAGE_SIZE); |
1870 | void *kbuf; | |
1871 | ||
1872 | *size = min_t(size_t, *size, KMALLOC_MAX_SIZE); | |
1873 | ||
1874 | while (*size > min_alloc) { | |
1875 | kbuf = kmalloc(*size, flags); | |
1876 | if (kbuf) | |
1877 | return kbuf; | |
1878 | ||
1879 | *size >>= 1; | |
1880 | *size = ALIGN(*size, mtd->writesize); | |
1881 | } | |
1882 | ||
1883 | /* | |
1884 | * For the last resort allocation allow 'kmalloc()' to do all sorts of | |
1885 | * things (write-back, dropping caches, etc) by using GFP_KERNEL. | |
1886 | */ | |
1887 | return kmalloc(*size, GFP_KERNEL); | |
1888 | } | |
33b53716 | 1889 | EXPORT_SYMBOL_GPL(mtd_kmalloc_up_to); |
1da177e4 | 1890 | |
2d2dce0e PM |
1891 | #ifdef CONFIG_PROC_FS |
1892 | ||
1da177e4 LT |
1893 | /*====================================================================*/ |
1894 | /* Support for /proc/mtd */ | |
1895 | ||
447d9bd8 | 1896 | static int mtd_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1897 | { |
f1332ba2 | 1898 | struct mtd_info *mtd; |
1da177e4 | 1899 | |
447d9bd8 | 1900 | seq_puts(m, "dev: size erasesize name\n"); |
48b19268 | 1901 | mutex_lock(&mtd_table_mutex); |
f1332ba2 | 1902 | mtd_for_each_device(mtd) { |
447d9bd8 AD |
1903 | seq_printf(m, "mtd%d: %8.8llx %8.8x \"%s\"\n", |
1904 | mtd->index, (unsigned long long)mtd->size, | |
1905 | mtd->erasesize, mtd->name); | |
d5ca5129 | 1906 | } |
48b19268 | 1907 | mutex_unlock(&mtd_table_mutex); |
d5ca5129 | 1908 | return 0; |
1da177e4 | 1909 | } |
45b09076 KC |
1910 | #endif /* CONFIG_PROC_FS */ |
1911 | ||
1da177e4 LT |
1912 | /*====================================================================*/ |
1913 | /* Init code */ | |
1914 | ||
445caaa2 | 1915 | static struct backing_dev_info * __init mtd_bdi_init(char *name) |
0661b1ac | 1916 | { |
445caaa2 | 1917 | struct backing_dev_info *bdi; |
0661b1ac JA |
1918 | int ret; |
1919 | ||
fa06052d | 1920 | bdi = bdi_alloc(GFP_KERNEL); |
445caaa2 SL |
1921 | if (!bdi) |
1922 | return ERR_PTR(-ENOMEM); | |
0661b1ac | 1923 | |
fa06052d JK |
1924 | bdi->name = name; |
1925 | /* | |
1926 | * We put '-0' suffix to the name to get the same name format as we | |
1927 | * used to get. Since this is called only once, we get a unique name. | |
1928 | */ | |
7c4cc300 | 1929 | ret = bdi_register(bdi, "%.28s-0", name); |
0661b1ac | 1930 | if (ret) |
fa06052d | 1931 | bdi_put(bdi); |
0661b1ac | 1932 | |
445caaa2 | 1933 | return ret ? ERR_PTR(ret) : bdi; |
0661b1ac JA |
1934 | } |
1935 | ||
93e56214 AB |
1936 | static struct proc_dir_entry *proc_mtd; |
1937 | ||
1da177e4 LT |
1938 | static int __init init_mtd(void) |
1939 | { | |
15bce40c | 1940 | int ret; |
0661b1ac | 1941 | |
15bce40c | 1942 | ret = class_register(&mtd_class); |
0661b1ac JA |
1943 | if (ret) |
1944 | goto err_reg; | |
1945 | ||
445caaa2 SL |
1946 | mtd_bdi = mtd_bdi_init("mtd"); |
1947 | if (IS_ERR(mtd_bdi)) { | |
1948 | ret = PTR_ERR(mtd_bdi); | |
b4caecd4 | 1949 | goto err_bdi; |
445caaa2 | 1950 | } |
694bb7fc | 1951 | |
3f3942ac | 1952 | proc_mtd = proc_create_single("mtd", 0, NULL, mtd_proc_show); |
93e56214 | 1953 | |
660685d9 AB |
1954 | ret = init_mtdchar(); |
1955 | if (ret) | |
1956 | goto out_procfs; | |
1957 | ||
e8e3edb9 MR |
1958 | dfs_dir_mtd = debugfs_create_dir("mtd", NULL); |
1959 | ||
1da177e4 | 1960 | return 0; |
0661b1ac | 1961 | |
660685d9 AB |
1962 | out_procfs: |
1963 | if (proc_mtd) | |
1964 | remove_proc_entry("mtd", NULL); | |
fa06052d | 1965 | bdi_put(mtd_bdi); |
b4caecd4 | 1966 | err_bdi: |
0661b1ac JA |
1967 | class_unregister(&mtd_class); |
1968 | err_reg: | |
1969 | pr_err("Error registering mtd class or bdi: %d\n", ret); | |
1970 | return ret; | |
1da177e4 LT |
1971 | } |
1972 | ||
1973 | static void __exit cleanup_mtd(void) | |
1974 | { | |
e8e3edb9 | 1975 | debugfs_remove_recursive(dfs_dir_mtd); |
660685d9 | 1976 | cleanup_mtdchar(); |
d5ca5129 | 1977 | if (proc_mtd) |
93e56214 | 1978 | remove_proc_entry("mtd", NULL); |
15bce40c | 1979 | class_unregister(&mtd_class); |
fa06052d | 1980 | bdi_put(mtd_bdi); |
35667b99 | 1981 | idr_destroy(&mtd_idr); |
1da177e4 LT |
1982 | } |
1983 | ||
1984 | module_init(init_mtd); | |
1985 | module_exit(cleanup_mtd); | |
1986 | ||
1da177e4 LT |
1987 | MODULE_LICENSE("GPL"); |
1988 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
1989 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |