linux/include/linux/mtd/mtd.h
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   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_ERASE_PENDING       0x01
  34#define MTD_ERASING             0x02
  35#define MTD_ERASE_SUSPEND       0x04
  36#define MTD_ERASE_DONE          0x08
  37#define MTD_ERASE_FAILED        0x10
  38
  39#define MTD_FAIL_ADDR_UNKNOWN -1LL
  40
  41/*
  42 * If the erase fails, fail_addr might indicate exactly which block failed. If
  43 * fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level
  44 * or was not specific to any particular block.
  45 */
  46struct erase_info {
  47        struct mtd_info *mtd;
  48        uint64_t addr;
  49        uint64_t len;
  50        uint64_t fail_addr;
  51        u_long time;
  52        u_long retries;
  53        unsigned dev;
  54        unsigned cell;
  55        void (*callback) (struct erase_info *self);
  56        u_long priv;
  57        u_char state;
  58        struct erase_info *next;
  59};
  60
  61struct mtd_erase_region_info {
  62        uint64_t offset;                /* At which this region starts, from the beginning of the MTD */
  63        uint32_t erasesize;             /* For this region */
  64        uint32_t numblocks;             /* Number of blocks of erasesize in this region */
  65        unsigned long *lockmap;         /* If keeping bitmap of locks */
  66};
  67
  68/**
  69 * struct mtd_oob_ops - oob operation operands
  70 * @mode:       operation mode
  71 *
  72 * @len:        number of data bytes to write/read
  73 *
  74 * @retlen:     number of data bytes written/read
  75 *
  76 * @ooblen:     number of oob bytes to write/read
  77 * @oobretlen:  number of oob bytes written/read
  78 * @ooboffs:    offset of oob data in the oob area (only relevant when
  79 *              mode = MTD_OPS_PLACE_OOB or MTD_OPS_RAW)
  80 * @datbuf:     data buffer - if NULL only oob data are read/written
  81 * @oobbuf:     oob data buffer
  82 *
  83 * Note, it is allowed to read more than one OOB area at one go, but not write.
  84 * The interface assumes that the OOB write requests program only one page's
  85 * OOB area.
  86 */
  87struct mtd_oob_ops {
  88        unsigned int    mode;
  89        size_t          len;
  90        size_t          retlen;
  91        size_t          ooblen;
  92        size_t          oobretlen;
  93        uint32_t        ooboffs;
  94        uint8_t         *datbuf;
  95        uint8_t         *oobbuf;
  96};
  97
  98#define MTD_MAX_OOBFREE_ENTRIES_LARGE   32
  99#define MTD_MAX_ECCPOS_ENTRIES_LARGE    640
 100/**
 101 * struct mtd_oob_region - oob region definition
 102 * @offset: region offset
 103 * @length: region length
 104 *
 105 * This structure describes a region of the OOB area, and is used
 106 * to retrieve ECC or free bytes sections.
 107 * Each section is defined by an offset within the OOB area and a
 108 * length.
 109 */
 110struct mtd_oob_region {
 111        u32 offset;
 112        u32 length;
 113};
 114
 115/*
 116 * struct mtd_ooblayout_ops - NAND OOB layout operations
 117 * @ecc: function returning an ECC region in the OOB area.
 118 *       Should return -ERANGE if %section exceeds the total number of
 119 *       ECC sections.
 120 * @free: function returning a free region in the OOB area.
 121 *        Should return -ERANGE if %section exceeds the total number of
 122 *        free sections.
 123 */
 124struct mtd_ooblayout_ops {
 125        int (*ecc)(struct mtd_info *mtd, int section,
 126                   struct mtd_oob_region *oobecc);
 127        int (*free)(struct mtd_info *mtd, int section,
 128                    struct mtd_oob_region *oobfree);
 129};
 130
 131/**
 132 * struct mtd_pairing_info - page pairing information
 133 *
 134 * @pair: pair id
 135 * @group: group id
 136 *
 137 * The term "pair" is used here, even though TLC NANDs might group pages by 3
 138 * (3 bits in a single cell). A pair should regroup all pages that are sharing
 139 * the same cell. Pairs are then indexed in ascending order.
 140 *
 141 * @group is defining the position of a page in a given pair. It can also be
 142 * seen as the bit position in the cell: page attached to bit 0 belongs to
 143 * group 0, page attached to bit 1 belongs to group 1, etc.
 144 *
 145 * Example:
 146 * The H27UCG8T2BTR-BC datasheet describes the following pairing scheme:
 147 *
 148 *              group-0         group-1
 149 *
 150 *  pair-0      page-0          page-4
 151 *  pair-1      page-1          page-5
 152 *  pair-2      page-2          page-8
 153 *  ...
 154 *  pair-127    page-251        page-255
 155 *
 156 *
 157 * Note that the "group" and "pair" terms were extracted from Samsung and
 158 * Hynix datasheets, and might be referenced under other names in other
 159 * datasheets (Micron is describing this concept as "shared pages").
 160 */
 161struct mtd_pairing_info {
 162        int pair;
 163        int group;
 164};
 165
 166/**
 167 * struct mtd_pairing_scheme - page pairing scheme description
 168 *
 169 * @ngroups: number of groups. Should be related to the number of bits
 170 *           per cell.
 171 * @get_info: converts a write-unit (page number within an erase block) into
 172 *            mtd_pairing information (pair + group). This function should
 173 *            fill the info parameter based on the wunit index or return
 174 *            -EINVAL if the wunit parameter is invalid.
 175 * @get_wunit: converts pairing information into a write-unit (page) number.
 176 *             This function should return the wunit index pointed by the
 177 *             pairing information described in the info argument. It should
 178 *             return -EINVAL, if there's no wunit corresponding to the
 179 *             passed pairing information.
 180 *
 181 * See mtd_pairing_info documentation for a detailed explanation of the
 182 * pair and group concepts.
 183 *
 184 * The mtd_pairing_scheme structure provides a generic solution to represent
 185 * NAND page pairing scheme. Instead of exposing two big tables to do the
 186 * write-unit <-> (pair + group) conversions, we ask the MTD drivers to
 187 * implement the ->get_info() and ->get_wunit() functions.
 188 *
 189 * MTD users will then be able to query these information by using the
 190 * mtd_pairing_info_to_wunit() and mtd_wunit_to_pairing_info() helpers.
 191 *
 192 * @ngroups is here to help MTD users iterating over all the pages in a
 193 * given pair. This value can be retrieved by MTD users using the
 194 * mtd_pairing_groups() helper.
 195 *
 196 * Examples are given in the mtd_pairing_info_to_wunit() and
 197 * mtd_wunit_to_pairing_info() documentation.
 198 */
 199struct mtd_pairing_scheme {
 200        int ngroups;
 201        int (*get_info)(struct mtd_info *mtd, int wunit,
 202                        struct mtd_pairing_info *info);
 203        int (*get_wunit)(struct mtd_info *mtd,
 204                         const struct mtd_pairing_info *info);
 205};
 206
 207struct module;  /* only needed for owner field in mtd_info */
 208
 209struct mtd_info {
 210        u_char type;
 211        uint32_t flags;
 212        uint64_t size;   // Total size of the MTD
 213
 214        /* "Major" erase size for the device. Naïve users may take this
 215         * to be the only erase size available, or may use the more detailed
 216         * information below if they desire
 217         */
 218        uint32_t erasesize;
 219        /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
 220         * though individual bits can be cleared), in case of NAND flash it is
 221         * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
 222         * it is of ECC block size, etc. It is illegal to have writesize = 0.
 223         * Any driver registering a struct mtd_info must ensure a writesize of
 224         * 1 or larger.
 225         */
 226        uint32_t writesize;
 227
 228        /*
 229         * Size of the write buffer used by the MTD. MTD devices having a write
 230         * buffer can write multiple writesize chunks at a time. E.g. while
 231         * writing 4 * writesize bytes to a device with 2 * writesize bytes
 232         * buffer the MTD driver can (but doesn't have to) do 2 writesize
 233         * operations, but not 4. Currently, all NANDs have writebufsize
 234         * equivalent to writesize (NAND page size). Some NOR flashes do have
 235         * writebufsize greater than writesize.
 236         */
 237        uint32_t writebufsize;
 238
 239        uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
 240        uint32_t oobavail;  // Available OOB bytes per block
 241
 242        /*
 243         * If erasesize is a power of 2 then the shift is stored in
 244         * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
 245         */
 246        unsigned int erasesize_shift;
 247        unsigned int writesize_shift;
 248        /* Masks based on erasesize_shift and writesize_shift */
 249        unsigned int erasesize_mask;
 250        unsigned int writesize_mask;
 251
 252        /*
 253         * read ops return -EUCLEAN if max number of bitflips corrected on any
 254         * one region comprising an ecc step equals or exceeds this value.
 255         * Settable by driver, else defaults to ecc_strength.  User can override
 256         * in sysfs.  N.B. The meaning of the -EUCLEAN return code has changed;
 257         * see Documentation/ABI/testing/sysfs-class-mtd for more detail.
 258         */
 259        unsigned int bitflip_threshold;
 260
 261        // Kernel-only stuff starts here.
 262        const char *name;
 263        int index;
 264
 265        /* OOB layout description */
 266        const struct mtd_ooblayout_ops *ooblayout;
 267
 268        /* NAND pairing scheme, only provided for MLC/TLC NANDs */
 269        const struct mtd_pairing_scheme *pairing;
 270
 271        /* the ecc step size. */
 272        unsigned int ecc_step_size;
 273
 274        /* max number of correctible bit errors per ecc step */
 275        unsigned int ecc_strength;
 276
 277        /* Data for variable erase regions. If numeraseregions is zero,
 278         * it means that the whole device has erasesize as given above.
 279         */
 280        int numeraseregions;
 281        struct mtd_erase_region_info *eraseregions;
 282
 283        /*
 284         * Do not call via these pointers, use corresponding mtd_*()
 285         * wrappers instead.
 286         */
 287        int (*_erase) (struct mtd_info *mtd, struct erase_info *instr);
 288        int (*_point) (struct mtd_info *mtd, loff_t from, size_t len,
 289                       size_t *retlen, void **virt, resource_size_t *phys);
 290        int (*_unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
 291        unsigned long (*_get_unmapped_area) (struct mtd_info *mtd,
 292                                             unsigned long len,
 293                                             unsigned long offset,
 294                                             unsigned long flags);
 295        int (*_read) (struct mtd_info *mtd, loff_t from, size_t len,
 296                      size_t *retlen, u_char *buf);
 297        int (*_write) (struct mtd_info *mtd, loff_t to, size_t len,
 298                       size_t *retlen, const u_char *buf);
 299        int (*_panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
 300                             size_t *retlen, const u_char *buf);
 301        int (*_read_oob) (struct mtd_info *mtd, loff_t from,
 302                          struct mtd_oob_ops *ops);
 303        int (*_write_oob) (struct mtd_info *mtd, loff_t to,
 304                           struct mtd_oob_ops *ops);
 305        int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len,
 306                                    size_t *retlen, struct otp_info *buf);
 307        int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
 308                                    size_t len, size_t *retlen, u_char *buf);
 309        int (*_get_user_prot_info) (struct mtd_info *mtd, size_t len,
 310                                    size_t *retlen, struct otp_info *buf);
 311        int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 312                                    size_t len, size_t *retlen, u_char *buf);
 313        int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to,
 314                                     size_t len, size_t *retlen, u_char *buf);
 315        int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 316                                    size_t len);
 317        int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs,
 318                        unsigned long count, loff_t to, size_t *retlen);
 319        void (*_sync) (struct mtd_info *mtd);
 320        int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 321        int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 322        int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 323        int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs);
 324        int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs);
 325        int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
 326        int (*_max_bad_blocks) (struct mtd_info *mtd, loff_t ofs, size_t len);
 327        int (*_suspend) (struct mtd_info *mtd);
 328        void (*_resume) (struct mtd_info *mtd);
 329        void (*_reboot) (struct mtd_info *mtd);
 330        /*
 331         * If the driver is something smart, like UBI, it may need to maintain
 332         * its own reference counting. The below functions are only for driver.
 333         */
 334        int (*_get_device) (struct mtd_info *mtd);
 335        void (*_put_device) (struct mtd_info *mtd);
 336
 337        struct notifier_block reboot_notifier;  /* default mode before reboot */
 338
 339        /* ECC status information */
 340        struct mtd_ecc_stats ecc_stats;
 341        /* Subpage shift (NAND) */
 342        int subpage_sft;
 343
 344        void *priv;
 345
 346        struct module *owner;
 347        struct device dev;
 348        int usecount;
 349};
 350
 351int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
 352                      struct mtd_oob_region *oobecc);
 353int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
 354                                 int *section,
 355                                 struct mtd_oob_region *oobregion);
 356int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
 357                               const u8 *oobbuf, int start, int nbytes);
 358int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
 359                               u8 *oobbuf, int start, int nbytes);
 360int mtd_ooblayout_free(struct mtd_info *mtd, int section,
 361                       struct mtd_oob_region *oobfree);
 362int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
 363                                const u8 *oobbuf, int start, int nbytes);
 364int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 365                                u8 *oobbuf, int start, int nbytes);
 366int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 367int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 368
 369static inline void mtd_set_ooblayout(struct mtd_info *mtd,
 370                                     const struct mtd_ooblayout_ops *ooblayout)
 371{
 372        mtd->ooblayout = ooblayout;
 373}
 374
 375static inline void mtd_set_pairing_scheme(struct mtd_info *mtd,
 376                                const struct mtd_pairing_scheme *pairing)
 377{
 378        mtd->pairing = pairing;
 379}
 380
 381static inline void mtd_set_of_node(struct mtd_info *mtd,
 382                                   struct device_node *np)
 383{
 384        mtd->dev.of_node = np;
 385        if (!mtd->name)
 386                of_property_read_string(np, "label", &mtd->name);
 387}
 388
 389static inline struct device_node *mtd_get_of_node(struct mtd_info *mtd)
 390{
 391        return dev_of_node(&mtd->dev);
 392}
 393
 394static inline int mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops)
 395{
 396        return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
 397}
 398
 399static inline int mtd_max_bad_blocks(struct mtd_info *mtd,
 400                                     loff_t ofs, size_t len)
 401{
 402        if (!mtd->_max_bad_blocks)
 403                return -ENOTSUPP;
 404
 405        if (mtd->size < (len + ofs) || ofs < 0)
 406                return -EINVAL;
 407
 408        return mtd->_max_bad_blocks(mtd, ofs, len);
 409}
 410
 411int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
 412                              struct mtd_pairing_info *info);
 413int mtd_pairing_info_to_wunit(struct mtd_info *mtd,
 414                              const struct mtd_pairing_info *info);
 415int mtd_pairing_groups(struct mtd_info *mtd);
 416int mtd_erase(struct mtd_info *mtd, struct erase_info *instr);
 417int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
 418              void **virt, resource_size_t *phys);
 419int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
 420unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
 421                                    unsigned long offset, unsigned long flags);
 422int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
 423             u_char *buf);
 424int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
 425              const u_char *buf);
 426int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
 427                    const u_char *buf);
 428
 429int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops);
 430int mtd_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops);
 431
 432int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
 433                           struct otp_info *buf);
 434int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
 435                           size_t *retlen, u_char *buf);
 436int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
 437                           struct otp_info *buf);
 438int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
 439                           size_t *retlen, u_char *buf);
 440int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
 441                            size_t *retlen, u_char *buf);
 442int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);
 443
 444int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 445               unsigned long count, loff_t to, size_t *retlen);
 446
 447static inline void mtd_sync(struct mtd_info *mtd)
 448{
 449        if (mtd->_sync)
 450                mtd->_sync(mtd);
 451}
 452
 453int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 454int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 455int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 456int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs);
 457int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
 458int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
 459
 460static inline int mtd_suspend(struct mtd_info *mtd)
 461{
 462        return mtd->_suspend ? mtd->_suspend(mtd) : 0;
 463}
 464
 465static inline void mtd_resume(struct mtd_info *mtd)
 466{
 467        if (mtd->_resume)
 468                mtd->_resume(mtd);
 469}
 470
 471static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
 472{
 473        if (mtd->erasesize_shift)
 474                return sz >> mtd->erasesize_shift;
 475        do_div(sz, mtd->erasesize);
 476        return sz;
 477}
 478
 479static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
 480{
 481        if (mtd->erasesize_shift)
 482                return sz & mtd->erasesize_mask;
 483        return do_div(sz, mtd->erasesize);
 484}
 485
 486static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
 487{
 488        if (mtd->writesize_shift)
 489                return sz >> mtd->writesize_shift;
 490        do_div(sz, mtd->writesize);
 491        return sz;
 492}
 493
 494static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
 495{
 496        if (mtd->writesize_shift)
 497                return sz & mtd->writesize_mask;
 498        return do_div(sz, mtd->writesize);
 499}
 500
 501static inline int mtd_wunit_per_eb(struct mtd_info *mtd)
 502{
 503        return mtd->erasesize / mtd->writesize;
 504}
 505
 506static inline int mtd_offset_to_wunit(struct mtd_info *mtd, loff_t offs)
 507{
 508        return mtd_div_by_ws(mtd_mod_by_eb(offs, mtd), mtd);
 509}
 510
 511static inline loff_t mtd_wunit_to_offset(struct mtd_info *mtd, loff_t base,
 512                                         int wunit)
 513{
 514        return base + (wunit * mtd->writesize);
 515}
 516
 517
 518static inline int mtd_has_oob(const struct mtd_info *mtd)
 519{
 520        return mtd->_read_oob && mtd->_write_oob;
 521}
 522
 523static inline int mtd_type_is_nand(const struct mtd_info *mtd)
 524{
 525        return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
 526}
 527
 528static inline int mtd_can_have_bb(const struct mtd_info *mtd)
 529{
 530        return !!mtd->_block_isbad;
 531}
 532
 533        /* Kernel-side ioctl definitions */
 534
 535struct mtd_partition;
 536struct mtd_part_parser_data;
 537
 538extern int mtd_device_parse_register(struct mtd_info *mtd,
 539                                     const char * const *part_probe_types,
 540                                     struct mtd_part_parser_data *parser_data,
 541                                     const struct mtd_partition *defparts,
 542                                     int defnr_parts);
 543#define mtd_device_register(master, parts, nr_parts)    \
 544        mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
 545extern int mtd_device_unregister(struct mtd_info *master);
 546extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 547extern int __get_mtd_device(struct mtd_info *mtd);
 548extern void __put_mtd_device(struct mtd_info *mtd);
 549extern struct mtd_info *get_mtd_device_nm(const char *name);
 550extern void put_mtd_device(struct mtd_info *mtd);
 551
 552
 553struct mtd_notifier {
 554        void (*add)(struct mtd_info *mtd);
 555        void (*remove)(struct mtd_info *mtd);
 556        struct list_head list;
 557};
 558
 559
 560extern void register_mtd_user (struct mtd_notifier *new);
 561extern int unregister_mtd_user (struct mtd_notifier *old);
 562void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
 563
 564void mtd_erase_callback(struct erase_info *instr);
 565
 566static inline int mtd_is_bitflip(int err) {
 567        return err == -EUCLEAN;
 568}
 569
 570static inline int mtd_is_eccerr(int err) {
 571        return err == -EBADMSG;
 572}
 573
 574static inline int mtd_is_bitflip_or_eccerr(int err) {
 575        return mtd_is_bitflip(err) || mtd_is_eccerr(err);
 576}
 577
 578unsigned mtd_mmap_capabilities(struct mtd_info *mtd);
 579
 580#endif /* __MTD_MTD_H__ */
 581