include/linux/mtd/mtd.h

   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  */
  46 struct 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
  61 struct 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  */
  87 struct 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  */
 110 struct 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  */
 124 struct 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  */
 161 struct 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  */
 199 struct 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
 207 struct module;  /* only needed for owner field in mtd_info */
 208
 209 /**
 210  * struct mtd_debug_info - debugging information for an MTD device.
 211  *
 212  * @dfs_dir: direntry object of the MTD device debugfs directory
 213  */
 214 struct mtd_debug_info {
 215         struct dentry *dfs_dir;
 216 };
 217
 218 struct mtd_info {
 219         u_char type;
 220         uint32_t flags;
 221         uint64_t size;   // Total size of the MTD
 222
 223         /* "Major" erase size for the device. Naïve users may take this
 224          * to be the only erase size available, or may use the more detailed
 225          * information below if they desire
 226          */
 227         uint32_t erasesize;
 228         /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
 229          * though individual bits can be cleared), in case of NAND flash it is
 230          * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
 231          * it is of ECC block size, etc. It is illegal to have writesize = 0.
 232          * Any driver registering a struct mtd_info must ensure a writesize of
 233          * 1 or larger.
 234          */
 235         uint32_t writesize;
 236
 237         /*
 238          * Size of the write buffer used by the MTD. MTD devices having a write
 239          * buffer can write multiple writesize chunks at a time. E.g. while
 240          * writing 4 * writesize bytes to a device with 2 * writesize bytes
 241          * buffer the MTD driver can (but doesn't have to) do 2 writesize
 242          * operations, but not 4. Currently, all NANDs have writebufsize
 243          * equivalent to writesize (NAND page size). Some NOR flashes do have
 244          * writebufsize greater than writesize.
 245          */
 246         uint32_t writebufsize;
 247
 248         uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
 249         uint32_t oobavail;  // Available OOB bytes per block
 250
 251         /*
 252          * If erasesize is a power of 2 then the shift is stored in
 253          * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
 254          */
 255         unsigned int erasesize_shift;
 256         unsigned int writesize_shift;
 257         /* Masks based on erasesize_shift and writesize_shift */
 258         unsigned int erasesize_mask;
 259         unsigned int writesize_mask;
 260
 261         /*
 262          * read ops return -EUCLEAN if max number of bitflips corrected on any
 263          * one region comprising an ecc step equals or exceeds this value.
 264          * Settable by driver, else defaults to ecc_strength.  User can override
 265          * in sysfs.  N.B. The meaning of the -EUCLEAN return code has changed;
 266          * see Documentation/ABI/testing/sysfs-class-mtd for more detail.
 267          */
 268         unsigned int bitflip_threshold;
 269
 270         /* Kernel-only stuff starts here. */
 271         const char *name;
 272         int index;
 273
 274         /* OOB layout description */
 275         const struct mtd_ooblayout_ops *ooblayout;
 276
 277         /* NAND pairing scheme, only provided for MLC/TLC NANDs */
 278         const struct mtd_pairing_scheme *pairing;
 279
 280         /* the ecc step size. */
 281         unsigned int ecc_step_size;
 282
 283         /* max number of correctible bit errors per ecc step */
 284         unsigned int ecc_strength;
 285
 286         /* Data for variable erase regions. If numeraseregions is zero,
 287          * it means that the whole device has erasesize as given above.
 288          */
 289         int numeraseregions;
 290         struct mtd_erase_region_info *eraseregions;
 291
 292         /*
 293          * Do not call via these pointers, use corresponding mtd_*()
 294          * wrappers instead.
 295          */
 296         int (*_erase) (struct mtd_info *mtd, struct erase_info *instr);
 297         int (*_point) (struct mtd_info *mtd, loff_t from, size_t len,
 298                        size_t *retlen, void **virt, resource_size_t *phys);
 299         int (*_unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
 300         int (*_read) (struct mtd_info *mtd, loff_t from, size_t len,
 301                       size_t *retlen, u_char *buf);
 302         int (*_write) (struct mtd_info *mtd, loff_t to, size_t len,
 303                        size_t *retlen, const u_char *buf);
 304         int (*_panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
 305                              size_t *retlen, const u_char *buf);
 306         int (*_read_oob) (struct mtd_info *mtd, loff_t from,
 307                           struct mtd_oob_ops *ops);
 308         int (*_write_oob) (struct mtd_info *mtd, loff_t to,
 309                            struct mtd_oob_ops *ops);
 310         int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len,
 311                                     size_t *retlen, struct otp_info *buf);
 312         int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
 313                                     size_t len, size_t *retlen, u_char *buf);
 314         int (*_get_user_prot_info) (struct mtd_info *mtd, size_t len,
 315                                     size_t *retlen, struct otp_info *buf);
 316         int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 317                                     size_t len, size_t *retlen, u_char *buf);
 318         int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to,
 319                                      size_t len, size_t *retlen, u_char *buf);
 320         int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 321                                     size_t len);
 322         int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs,
 323                         unsigned long count, loff_t to, size_t *retlen);
 324         void (*_sync) (struct mtd_info *mtd);
 325         int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 326         int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 327         int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 328         int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs);
 329         int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs);
 330         int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
 331         int (*_max_bad_blocks) (struct mtd_info *mtd, loff_t ofs, size_t len);
 332         int (*_suspend) (struct mtd_info *mtd);
 333         void (*_resume) (struct mtd_info *mtd);
 334         void (*_reboot) (struct mtd_info *mtd);
 335         /*
 336          * If the driver is something smart, like UBI, it may need to maintain
 337          * its own reference counting. The below functions are only for driver.
 338          */
 339         int (*_get_device) (struct mtd_info *mtd);
 340         void (*_put_device) (struct mtd_info *mtd);
 341
 342         struct notifier_block reboot_notifier;  /* default mode before reboot */
 343
 344         /* ECC status information */
 345         struct mtd_ecc_stats ecc_stats;
 346         /* Subpage shift (NAND) */
 347         int subpage_sft;
 348
 349         void *priv;
 350
 351         struct module *owner;
 352         struct device dev;
 353         int usecount;
 354         struct mtd_debug_info dbg;
 355 };
 356
 357 int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
 358                       struct mtd_oob_region *oobecc);
 359 int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
 360                                  int *section,
 361                                  struct mtd_oob_region *oobregion);
 362 int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
 363                                const u8 *oobbuf, int start, int nbytes);
 364 int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
 365                                u8 *oobbuf, int start, int nbytes);
 366 int mtd_ooblayout_free(struct mtd_info *mtd, int section,
 367                        struct mtd_oob_region *oobfree);
 368 int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
 369                                 const u8 *oobbuf, int start, int nbytes);
 370 int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 371                                 u8 *oobbuf, int start, int nbytes);
 372 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 373 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 374
 375 static inline void mtd_set_ooblayout(struct mtd_info *mtd,
 376                                      const struct mtd_ooblayout_ops *ooblayout)
 377 {
 378         mtd->ooblayout = ooblayout;
 379 }
 380
 381 static inline void mtd_set_pairing_scheme(struct mtd_info *mtd,
 382                                 const struct mtd_pairing_scheme *pairing)
 383 {
 384         mtd->pairing = pairing;
 385 }
 386
 387 static inline void mtd_set_of_node(struct mtd_info *mtd,
 388                                    struct device_node *np)
 389 {
 390         mtd->dev.of_node = np;
 391         if (!mtd->name)
 392                 of_property_read_string(np, "label", &mtd->name);
 393 }
 394
 395 static inline struct device_node *mtd_get_of_node(struct mtd_info *mtd)
 396 {
 397         return dev_of_node(&mtd->dev);
 398 }
 399
 400 static inline int mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops)
 401 {
 402         return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
 403 }
 404
 405 static inline int mtd_max_bad_blocks(struct mtd_info *mtd,
 406                                      loff_t ofs, size_t len)
 407 {
 408         if (!mtd->_max_bad_blocks)
 409                 return -ENOTSUPP;
 410
 411         if (mtd->size < (len + ofs) || ofs < 0)
 412                 return -EINVAL;
 413
 414         return mtd->_max_bad_blocks(mtd, ofs, len);
 415 }
 416
 417 int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
 418                               struct mtd_pairing_info *info);
 419 int mtd_pairing_info_to_wunit(struct mtd_info *mtd,
 420                               const struct mtd_pairing_info *info);
 421 int mtd_pairing_groups(struct mtd_info *mtd);
 422 int mtd_erase(struct mtd_info *mtd, struct erase_info *instr);
 423 int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
 424               void **virt, resource_size_t *phys);
 425 int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
 426 unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
 427                                     unsigned long offset, unsigned long flags);
 428 int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
 429              u_char *buf);
 430 int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
 431               const u_char *buf);
 432 int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
 433                     const u_char *buf);
 434
 435 int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops);
 436 int mtd_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops);
 437
 438 int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
 439                            struct otp_info *buf);
 440 int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
 441                            size_t *retlen, u_char *buf);
 442 int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
 443                            struct otp_info *buf);
 444 int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
 445                            size_t *retlen, u_char *buf);
 446 int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
 447                             size_t *retlen, u_char *buf);
 448 int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);
 449
 450 int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 451                unsigned long count, loff_t to, size_t *retlen);
 452
 453 static inline void mtd_sync(struct mtd_info *mtd)
 454 {
 455         if (mtd->_sync)
 456                 mtd->_sync(mtd);
 457 }
 458
 459 int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 460 int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 461 int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 462 int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs);
 463 int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
 464 int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
 465
 466 static inline int mtd_suspend(struct mtd_info *mtd)
 467 {
 468         return mtd->_suspend ? mtd->_suspend(mtd) : 0;
 469 }
 470
 471 static inline void mtd_resume(struct mtd_info *mtd)
 472 {
 473         if (mtd->_resume)
 474                 mtd->_resume(mtd);
 475 }
 476
 477 static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
 478 {
 479         if (mtd->erasesize_shift)
 480                 return sz >> mtd->erasesize_shift;
 481         do_div(sz, mtd->erasesize);
 482         return sz;
 483 }
 484
 485 static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
 486 {
 487         if (mtd->erasesize_shift)
 488                 return sz & mtd->erasesize_mask;
 489         return do_div(sz, mtd->erasesize);
 490 }
 491
 492 /**
 493  * mtd_align_erase_req - Adjust an erase request to align things on eraseblock
 494  *                       boundaries.
 495  * @mtd: the MTD device this erase request applies on
 496  * @req: the erase request to adjust
 497  *
 498  * This function will adjust @req->addr and @req->len to align them on
 499  * @mtd->erasesize. Of course we expect @mtd->erasesize to be != 0.
 500  */
 501 static inline void mtd_align_erase_req(struct mtd_info *mtd,
 502                                        struct erase_info *req)
 503 {
 504         u32 mod;
 505
 506         if (WARN_ON(!mtd->erasesize))
 507                 return;
 508
 509         mod = mtd_mod_by_eb(req->addr, mtd);
 510         if (mod) {
 511                 req->addr -= mod;
 512                 req->len += mod;
 513         }
 514
 515         mod = mtd_mod_by_eb(req->addr + req->len, mtd);
 516         if (mod)
 517                 req->len += mtd->erasesize - mod;
 518 }
 519
 520 static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
 521 {
 522         if (mtd->writesize_shift)
 523                 return sz >> mtd->writesize_shift;
 524         do_div(sz, mtd->writesize);
 525         return sz;
 526 }
 527
 528 static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
 529 {
 530         if (mtd->writesize_shift)
 531                 return sz & mtd->writesize_mask;
 532         return do_div(sz, mtd->writesize);
 533 }
 534
 535 static inline int mtd_wunit_per_eb(struct mtd_info *mtd)
 536 {
 537         return mtd->erasesize / mtd->writesize;
 538 }
 539
 540 static inline int mtd_offset_to_wunit(struct mtd_info *mtd, loff_t offs)
 541 {
 542         return mtd_div_by_ws(mtd_mod_by_eb(offs, mtd), mtd);
 543 }
 544
 545 static inline loff_t mtd_wunit_to_offset(struct mtd_info *mtd, loff_t base,
 546                                          int wunit)
 547 {
 548         return base + (wunit * mtd->writesize);
 549 }
 550
 551
 552 static inline int mtd_has_oob(const struct mtd_info *mtd)
 553 {
 554         return mtd->_read_oob && mtd->_write_oob;
 555 }
 556
 557 static inline int mtd_type_is_nand(const struct mtd_info *mtd)
 558 {
 559         return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
 560 }
 561
 562 static inline int mtd_can_have_bb(const struct mtd_info *mtd)
 563 {
 564         return !!mtd->_block_isbad;
 565 }
 566
 567         /* Kernel-side ioctl definitions */
 568
 569 struct mtd_partition;
 570 struct mtd_part_parser_data;
 571
 572 extern int mtd_device_parse_register(struct mtd_info *mtd,
 573                                      const char * const *part_probe_types,
 574                                      struct mtd_part_parser_data *parser_data,
 575                                      const struct mtd_partition *defparts,
 576                                      int defnr_parts);
 577 #define mtd_device_register(master, parts, nr_parts)    \
 578         mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
 579 extern int mtd_device_unregister(struct mtd_info *master);
 580 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 581 extern int __get_mtd_device(struct mtd_info *mtd);
 582 extern void __put_mtd_device(struct mtd_info *mtd);
 583 extern struct mtd_info *get_mtd_device_nm(const char *name);
 584 extern void put_mtd_device(struct mtd_info *mtd);
 585
 586
 587 struct mtd_notifier {
 588         void (*add)(struct mtd_info *mtd);
 589         void (*remove)(struct mtd_info *mtd);
 590         struct list_head list;
 591 };
 592
 593
 594 extern void register_mtd_user (struct mtd_notifier *new);
 595 extern int unregister_mtd_user (struct mtd_notifier *old);
 596 void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
 597
 598 void mtd_erase_callback(struct erase_info *instr);
 599
 600 static inline int mtd_is_bitflip(int err) {
 601         return err == -EUCLEAN;
 602 }
 603
 604 static inline int mtd_is_eccerr(int err) {
 605         return err == -EBADMSG;
 606 }
 607
 608 static inline int mtd_is_bitflip_or_eccerr(int err) {
 609         return mtd_is_bitflip(err) || mtd_is_eccerr(err);
 610 }
 611
 612 unsigned mtd_mmap_capabilities(struct mtd_info *mtd);
 613
 614 #endif /* __MTD_MTD_H__ */