1 /*
2 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 */
19
20 #ifndef __MTD_MTD_H__
21 #define __MTD_MTD_H__
22
23 #include <linux/types.h>
24 #include <linux/uio.h>
25 #include <linux/notifier.h>
26 #include <linux/device.h>
27 #include <linux/of.h>
28
29 #include <mtd/mtd-abi.h>
30
31 #include <asm/div64.h>
32
33 #define MTD_FAIL_ADDR_UNKNOWN -1LL
34
35 struct mtd_info;
36
37 /*
38 * If the erase fails, fail_addr might indicate exactly which block failed. If
39 * fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level
40 * or was not specific to any particular block.
41 */
42 struct erase_info {
43 uint64_t addr;
44 uint64_t len;
45 uint64_t fail_addr;
46 };
47
48 struct mtd_erase_region_info {
49 uint64_t offset; /* At which this region starts, from the beginning of the MTD */
50 uint32_t erasesize; /* For this region */
51 uint32_t numblocks; /* Number of blocks of erasesize in this region */
52 unsigned long *lockmap; /* If keeping bitmap of locks */
53 };
54
55 /**
56 * struct mtd_oob_ops - oob operation operands
57 * @mode: operation mode
58 *
59 * @len: number of data bytes to write/read
60 *
61 * @retlen: number of data bytes written/read
62 *
63 * @ooblen: number of oob bytes to write/read
64 * @oobretlen: number of oob bytes written/read
65 * @ooboffs: offset of oob data in the oob area (only relevant when
66 * mode = MTD_OPS_PLACE_OOB or MTD_OPS_RAW)
67 * @datbuf: data buffer - if NULL only oob data are read/written
68 * @oobbuf: oob data buffer
69 *
70 * Note, some MTD drivers do not allow you to write more than one OOB area at
71 * one go. If you try to do that on such an MTD device, -EINVAL will be
72 * returned. If you want to make your implementation portable on all kind of MTD
73 * devices you should split the write request into several sub-requests when the
74 * request crosses a page boundary.
75 */
76 struct mtd_oob_ops {
77 unsigned int mode;
78 size_t len;
79 size_t retlen;
80 size_t ooblen;
81 size_t oobretlen;
82 uint32_t ooboffs;
83 uint8_t *datbuf;
84 uint8_t *oobbuf;
85 };
86
87 #define MTD_MAX_OOBFREE_ENTRIES_LARGE 32
88 #define MTD_MAX_ECCPOS_ENTRIES_LARGE 640
89 /**
90 * struct mtd_oob_region - oob region definition
91 * @offset: region offset
92 * @length: region length
93 *
94 * This structure describes a region of the OOB area, and is used
95 * to retrieve ECC or free bytes sections.
96 * Each section is defined by an offset within the OOB area and a
97 * length.
98 */
99 struct mtd_oob_region {
100 u32 offset;
101 u32 length;
102 };
103
104 /*
105 * struct mtd_ooblayout_ops - NAND OOB layout operations
106 * @ecc: function returning an ECC region in the OOB area.
107 * Should return -ERANGE if %section exceeds the total number of
108 * ECC sections.
109 * @free: function returning a free region in the OOB area.
110 * Should return -ERANGE if %section exceeds the total number of
111 * free sections.
112 */
113 struct mtd_ooblayout_ops {
114 int (*ecc)(struct mtd_info *mtd, int section,
115 struct mtd_oob_region *oobecc);
116 int (*free)(struct mtd_info *mtd, int section,
117 struct mtd_oob_region *oobfree);
118 };
119
120 /**
121 * struct mtd_pairing_info - page pairing information
122 *
123 * @pair: pair id
124 * @group: group id
125 *
126 * The term "pair" is used here, even though TLC NANDs might group pages by 3
127 * (3 bits in a single cell). A pair should regroup all pages that are sharing
128 * the same cell. Pairs are then indexed in ascending order.
129 *
130 * @group is defining the position of a page in a given pair. It can also be
131 * seen as the bit position in the cell: page attached to bit 0 belongs to
132 * group 0, page attached to bit 1 belongs to group 1, etc.
133 *
134 * Example:
135 * The H27UCG8T2BTR-BC datasheet describes the following pairing scheme:
136 *
137 * group-0 group-1
138 *
139 * pair-0 page-0 page-4
140 * pair-1 page-1 page-5
141 * pair-2 page-2 page-8
142 * ...
143 * pair-127 page-251 page-255
144 *
145 *
146 * Note that the "group" and "pair" terms were extracted from Samsung and
147 * Hynix datasheets, and might be referenced under other names in other
148 * datasheets (Micron is describing this concept as "shared pages").
149 */
150 struct mtd_pairing_info {
151 int pair;
152 int group;
153 };
154
155 /**
156 * struct mtd_pairing_scheme - page pairing scheme description
157 *
158 * @ngroups: number of groups. Should be related to the number of bits
159 * per cell.
160 * @get_info: converts a write-unit (page number within an erase block) into
161 * mtd_pairing information (pair + group). This function should
162 * fill the info parameter based on the wunit index or return
163 * -EINVAL if the wunit parameter is invalid.
164 * @get_wunit: converts pairing information into a write-unit (page) number.
165 * This function should return the wunit index pointed by the
166 * pairing information described in the info argument. It should
167 * return -EINVAL, if there's no wunit corresponding to the
168 * passed pairing information.
169 *
170 * See mtd_pairing_info documentation for a detailed explanation of the
171 * pair and group concepts.
172 *
173 * The mtd_pairing_scheme structure provides a generic solution to represent
174 * NAND page pairing scheme. Instead of exposing two big tables to do the
175 * write-unit <-> (pair + group) conversions, we ask the MTD drivers to
176 * implement the ->get_info() and ->get_wunit() functions.
177 *
178 * MTD users will then be able to query these information by using the
179 * mtd_pairing_info_to_wunit() and mtd_wunit_to_pairing_info() helpers.
180 *
181 * @ngroups is here to help MTD users iterating over all the pages in a
182 * given pair. This value can be retrieved by MTD users using the
183 * mtd_pairing_groups() helper.
184 *
185 * Examples are given in the mtd_pairing_info_to_wunit() and
186 * mtd_wunit_to_pairing_info() documentation.
187 */
188 struct mtd_pairing_scheme {
189 int ngroups;
190 int (*get_info)(struct mtd_info *mtd, int wunit,
191 struct mtd_pairing_info *info);
192 int (*get_wunit)(struct mtd_info *mtd,
193 const struct mtd_pairing_info *info);
194 };
195
196 struct module; /* only needed for owner field in mtd_info */
197
198 /**
199 * struct mtd_debug_info - debugging information for an MTD device.
200 *
201 * @dfs_dir: direntry object of the MTD device debugfs directory
202 */
203 struct mtd_debug_info {
204 struct dentry *dfs_dir;
205 };
206
207 struct mtd_info {
208 u_char type;
209 uint32_t flags;
210 uint64_t size; // Total size of the MTD
211
212 /* "Major" erase size for the device. Naïve users may take this
213 * to be the only erase size available, or may use the more detailed
214 * information below if they desire
215 */
216 uint32_t erasesize;
217 /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
218 * though individual bits can be cleared), in case of NAND flash it is
219 * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
220 * it is of ECC block size, etc. It is illegal to have writesize = 0.
221 * Any driver registering a struct mtd_info must ensure a writesize of
222 * 1 or larger.
223 */
224 uint32_t writesize;
225
226 /*
227 * Size of the write buffer used by the MTD. MTD devices having a write
228 * buffer can write multiple writesize chunks at a time. E.g. while
229 * writing 4 * writesize bytes to a device with 2 * writesize bytes
230 * buffer the MTD driver can (but doesn't have to) do 2 writesize
231 * operations, but not 4. Currently, all NANDs have writebufsize
232 * equivalent to writesize (NAND page size). Some NOR flashes do have
233 * writebufsize greater than writesize.
234 */
235 uint32_t writebufsize;
236
237 uint32_t oobsize; // Amount of OOB data per block (e.g. 16)
238 uint32_t oobavail; // Available OOB bytes per block
239
240 /*
241 * If erasesize is a power of 2 then the shift is stored in
242 * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
243 */
244 unsigned int erasesize_shift;
245 unsigned int writesize_shift;
246 /* Masks based on erasesize_shift and writesize_shift */
247 unsigned int erasesize_mask;
248 unsigned int writesize_mask;
249
250 /*
251 * read ops return -EUCLEAN if max number of bitflips corrected on any
252 * one region comprising an ecc step equals or exceeds this value.
253 * Settable by driver, else defaults to ecc_strength. User can override
254 * in sysfs. N.B. The meaning of the -EUCLEAN return code has changed;
255 * see Documentation/ABI/testing/sysfs-class-mtd for more detail.
256 */
257 unsigned int bitflip_threshold;
258
259 /* Kernel-only stuff starts here. */
260 const char *name;
261 int index;
262
263 /* OOB layout description */
264 const struct mtd_ooblayout_ops *ooblayout;
265
266 /* NAND pairing scheme, only provided for MLC/TLC NANDs */
267 const struct mtd_pairing_scheme *pairing;
268
269 /* the ecc step size. */
270 unsigned int ecc_step_size;
271
272 /* max number of correctible bit errors per ecc step */
273 unsigned int ecc_strength;
274
275 /* Data for variable erase regions. If numeraseregions is zero,
276 * it means that the whole device has erasesize as given above.
277 */
278 int numeraseregions;
279 struct mtd_erase_region_info *eraseregions;
280
281 /*
282 * Do not call via these pointers, use corresponding mtd_*()
283 * wrappers instead.
284 */
285 int (*_erase) (struct mtd_info *mtd, struct erase_info *instr);
286 int (*_point) (struct mtd_info *mtd, loff_t from, size_t len,
287 size_t *retlen, void **virt, resource_size_t *phys);
288 int (*_unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
289 int (*_read) (struct mtd_info *mtd, loff_t from, size_t len,
290 size_t *retlen, u_char *buf);
291 int (*_write) (struct mtd_info *mtd, loff_t to, size_t len,
292 size_t *retlen, const u_char *buf);
293 int (*_panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
294 size_t *retlen, const u_char *buf);
295 int (*_read_oob) (struct mtd_info *mtd, loff_t from,
296 struct mtd_oob_ops *ops);
297 int (*_write_oob) (struct mtd_info *mtd, loff_t to,
298 struct mtd_oob_ops *ops);
299 int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len,
300 size_t *retlen, struct otp_info *buf);
301 int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
302 size_t len, size_t *retlen, u_char *buf);
303 int (*_get_user_prot_info) (struct mtd_info *mtd, size_t len,
304 size_t *retlen, struct otp_info *buf);
305 int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
306 size_t len, size_t *retlen, u_char *buf);
307 int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to,
308 size_t len, size_t *retlen, u_char *buf);
309 int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from,
310 size_t len);
311 int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs,
312 unsigned long count, loff_t to, size_t *retlen);
313 void (*_sync) (struct mtd_info *mtd);
314 int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
315 int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
316 int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
317 int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs);
318 int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs);
319 int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
320 int (*_max_bad_blocks) (struct mtd_info *mtd, loff_t ofs, size_t len);
321 int (*_suspend) (struct mtd_info *mtd);
322 void (*_resume) (struct mtd_info *mtd);
323 void (*_reboot) (struct mtd_info *mtd);
324 /*
325 * If the driver is something smart, like UBI, it may need to maintain
326 * its own reference counting. The below functions are only for driver.
327 */
328 int (*_get_device) (struct mtd_info *mtd);
329 void (*_put_device) (struct mtd_info *mtd);
330
331 struct notifier_block reboot_notifier; /* default mode before reboot */
332
333 /* ECC status information */
334 struct mtd_ecc_stats ecc_stats;
335 /* Subpage shift (NAND) */
336 int subpage_sft;
337
338 void *priv;
339
340 struct module *owner;
341 struct device dev;
342 int usecount;
343 struct mtd_debug_info dbg;
344 };
345
346 int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
347 struct mtd_oob_region *oobecc);
348 int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
349 int *section,
350 struct mtd_oob_region *oobregion);
351 int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
352 const u8 *oobbuf, int start, int nbytes);
353 int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
354 u8 *oobbuf, int start, int nbytes);
355 int mtd_ooblayout_free(struct mtd_info *mtd, int section,
356 struct mtd_oob_region *oobfree);
357 int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
358 const u8 *oobbuf, int start, int nbytes);
359 int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
360 u8 *oobbuf, int start, int nbytes);
361 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
362 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
363
mtd_set_ooblayout(struct mtd_info * mtd,const struct mtd_ooblayout_ops * ooblayout)364 static inline void mtd_set_ooblayout(struct mtd_info *mtd,
365 const struct mtd_ooblayout_ops *ooblayout)
366 {
367 mtd->ooblayout = ooblayout;
368 }
369
mtd_set_pairing_scheme(struct mtd_info * mtd,const struct mtd_pairing_scheme * pairing)370 static inline void mtd_set_pairing_scheme(struct mtd_info *mtd,
371 const struct mtd_pairing_scheme *pairing)
372 {
373 mtd->pairing = pairing;
374 }
375
mtd_set_of_node(struct mtd_info * mtd,struct device_node * np)376 static inline void mtd_set_of_node(struct mtd_info *mtd,
377 struct device_node *np)
378 {
379 mtd->dev.of_node = np;
380 if (!mtd->name)
381 of_property_read_string(np, "label", &mtd->name);
382 }
383
mtd_get_of_node(struct mtd_info * mtd)384 static inline struct device_node *mtd_get_of_node(struct mtd_info *mtd)
385 {
386 return dev_of_node(&mtd->dev);
387 }
388
mtd_oobavail(struct mtd_info * mtd,struct mtd_oob_ops * ops)389 static inline int mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops)
390 {
391 return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
392 }
393
mtd_max_bad_blocks(struct mtd_info * mtd,loff_t ofs,size_t len)394 static inline int mtd_max_bad_blocks(struct mtd_info *mtd,
395 loff_t ofs, size_t len)
396 {
397 if (!mtd->_max_bad_blocks)
398 return -ENOTSUPP;
399
400 if (mtd->size < (len + ofs) || ofs < 0)
401 return -EINVAL;
402
403 return mtd->_max_bad_blocks(mtd, ofs, len);
404 }
405
406 int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
407 struct mtd_pairing_info *info);
408 int mtd_pairing_info_to_wunit(struct mtd_info *mtd,
409 const struct mtd_pairing_info *info);
410 int mtd_pairing_groups(struct mtd_info *mtd);
411 int mtd_erase(struct mtd_info *mtd, struct erase_info *instr);
412 int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
413 void **virt, resource_size_t *phys);
414 int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
415 unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
416 unsigned long offset, unsigned long flags);
417 int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
418 u_char *buf);
419 int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
420 const u_char *buf);
421 int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
422 const u_char *buf);
423
424 int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops);
425 int mtd_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops);
426
427 int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
428 struct otp_info *buf);
429 int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
430 size_t *retlen, u_char *buf);
431 int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
432 struct otp_info *buf);
433 int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
434 size_t *retlen, u_char *buf);
435 int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
436 size_t *retlen, u_char *buf);
437 int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);
438
439 int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
440 unsigned long count, loff_t to, size_t *retlen);
441
mtd_sync(struct mtd_info * mtd)442 static inline void mtd_sync(struct mtd_info *mtd)
443 {
444 if (mtd->_sync)
445 mtd->_sync(mtd);
446 }
447
448 int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
449 int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
450 int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
451 int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs);
452 int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
453 int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
454
mtd_suspend(struct mtd_info * mtd)455 static inline int mtd_suspend(struct mtd_info *mtd)
456 {
457 return mtd->_suspend ? mtd->_suspend(mtd) : 0;
458 }
459
mtd_resume(struct mtd_info * mtd)460 static inline void mtd_resume(struct mtd_info *mtd)
461 {
462 if (mtd->_resume)
463 mtd->_resume(mtd);
464 }
465
mtd_div_by_eb(uint64_t sz,struct mtd_info * mtd)466 static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
467 {
468 if (mtd->erasesize_shift)
469 return sz >> mtd->erasesize_shift;
470 do_div(sz, mtd->erasesize);
471 return sz;
472 }
473
mtd_mod_by_eb(uint64_t sz,struct mtd_info * mtd)474 static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
475 {
476 if (mtd->erasesize_shift)
477 return sz & mtd->erasesize_mask;
478 return do_div(sz, mtd->erasesize);
479 }
480
481 /**
482 * mtd_align_erase_req - Adjust an erase request to align things on eraseblock
483 * boundaries.
484 * @mtd: the MTD device this erase request applies on
485 * @req: the erase request to adjust
486 *
487 * This function will adjust @req->addr and @req->len to align them on
488 * @mtd->erasesize. Of course we expect @mtd->erasesize to be != 0.
489 */
mtd_align_erase_req(struct mtd_info * mtd,struct erase_info * req)490 static inline void mtd_align_erase_req(struct mtd_info *mtd,
491 struct erase_info *req)
492 {
493 u32 mod;
494
495 if (WARN_ON(!mtd->erasesize))
496 return;
497
498 mod = mtd_mod_by_eb(req->addr, mtd);
499 if (mod) {
500 req->addr -= mod;
501 req->len += mod;
502 }
503
504 mod = mtd_mod_by_eb(req->addr + req->len, mtd);
505 if (mod)
506 req->len += mtd->erasesize - mod;
507 }
508
mtd_div_by_ws(uint64_t sz,struct mtd_info * mtd)509 static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
510 {
511 if (mtd->writesize_shift)
512 return sz >> mtd->writesize_shift;
513 do_div(sz, mtd->writesize);
514 return sz;
515 }
516
mtd_mod_by_ws(uint64_t sz,struct mtd_info * mtd)517 static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
518 {
519 if (mtd->writesize_shift)
520 return sz & mtd->writesize_mask;
521 return do_div(sz, mtd->writesize);
522 }
523
mtd_wunit_per_eb(struct mtd_info * mtd)524 static inline int mtd_wunit_per_eb(struct mtd_info *mtd)
525 {
526 return mtd->erasesize / mtd->writesize;
527 }
528
mtd_offset_to_wunit(struct mtd_info * mtd,loff_t offs)529 static inline int mtd_offset_to_wunit(struct mtd_info *mtd, loff_t offs)
530 {
531 return mtd_div_by_ws(mtd_mod_by_eb(offs, mtd), mtd);
532 }
533
mtd_wunit_to_offset(struct mtd_info * mtd,loff_t base,int wunit)534 static inline loff_t mtd_wunit_to_offset(struct mtd_info *mtd, loff_t base,
535 int wunit)
536 {
537 return base + (wunit * mtd->writesize);
538 }
539
540
mtd_has_oob(const struct mtd_info * mtd)541 static inline int mtd_has_oob(const struct mtd_info *mtd)
542 {
543 return mtd->_read_oob && mtd->_write_oob;
544 }
545
mtd_type_is_nand(const struct mtd_info * mtd)546 static inline int mtd_type_is_nand(const struct mtd_info *mtd)
547 {
548 return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
549 }
550
mtd_can_have_bb(const struct mtd_info * mtd)551 static inline int mtd_can_have_bb(const struct mtd_info *mtd)
552 {
553 return !!mtd->_block_isbad;
554 }
555
556 /* Kernel-side ioctl definitions */
557
558 struct mtd_partition;
559 struct mtd_part_parser_data;
560
561 extern int mtd_device_parse_register(struct mtd_info *mtd,
562 const char * const *part_probe_types,
563 struct mtd_part_parser_data *parser_data,
564 const struct mtd_partition *defparts,
565 int defnr_parts);
566 #define mtd_device_register(master, parts, nr_parts) \
567 mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
568 extern int mtd_device_unregister(struct mtd_info *master);
569 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
570 extern int __get_mtd_device(struct mtd_info *mtd);
571 extern void __put_mtd_device(struct mtd_info *mtd);
572 extern struct mtd_info *get_mtd_device_nm(const char *name);
573 extern void put_mtd_device(struct mtd_info *mtd);
574
575
576 struct mtd_notifier {
577 void (*add)(struct mtd_info *mtd);
578 void (*remove)(struct mtd_info *mtd);
579 struct list_head list;
580 };
581
582
583 extern void register_mtd_user (struct mtd_notifier *new);
584 extern int unregister_mtd_user (struct mtd_notifier *old);
585 void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
586
mtd_is_bitflip(int err)587 static inline int mtd_is_bitflip(int err) {
588 return err == -EUCLEAN;
589 }
590
mtd_is_eccerr(int err)591 static inline int mtd_is_eccerr(int err) {
592 return err == -EBADMSG;
593 }
594
mtd_is_bitflip_or_eccerr(int err)595 static inline int mtd_is_bitflip_or_eccerr(int err) {
596 return mtd_is_bitflip(err) || mtd_is_eccerr(err);
597 }
598
599 unsigned mtd_mmap_capabilities(struct mtd_info *mtd);
600
601 #endif /* __MTD_MTD_H__ */
602
