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
  28 #include <mtd/mtd-abi.h>
  29
  30 #include <asm/div64.h>
  31
  32 #define MTD_ERASE_PENDING       0x01
  33 #define MTD_ERASING             0x02
  34 #define MTD_ERASE_SUSPEND       0x04
  35 #define MTD_ERASE_DONE          0x08
  36 #define MTD_ERASE_FAILED        0x10
  37
  38 #define MTD_FAIL_ADDR_UNKNOWN -1LL
  39
  40 /*
  41  * If the erase fails, fail_addr might indicate exactly which block failed. If
  42  * fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level
  43  * or was not specific to any particular block.
  44  */
  45 struct erase_info {
  46         struct mtd_info *mtd;
  47         uint64_t addr;
  48         uint64_t len;
  49         uint64_t fail_addr;
  50         u_long time;
  51         u_long retries;
  52         unsigned dev;
  53         unsigned cell;
  54         void (*callback) (struct erase_info *self);
  55         u_long priv;
  56         u_char state;
  57         struct erase_info *next;
  58 };
  59
  60 struct mtd_erase_region_info {
  61         uint64_t offset;                /* At which this region starts, from the beginning of the MTD */
  62         uint32_t erasesize;             /* For this region */
  63         uint32_t numblocks;             /* Number of blocks of erasesize in this region */
  64         unsigned long *lockmap;         /* If keeping bitmap of locks */
  65 };
  66
  67 /**
  68  * struct mtd_oob_ops - oob operation operands
  69  * @mode:       operation mode
  70  *
  71  * @len:        number of data bytes to write/read
  72  *
  73  * @retlen:     number of data bytes written/read
  74  *
  75  * @ooblen:     number of oob bytes to write/read
  76  * @oobretlen:  number of oob bytes written/read
  77  * @ooboffs:    offset of oob data in the oob area (only relevant when
  78  *              mode = MTD_OPS_PLACE_OOB or MTD_OPS_RAW)
  79  * @datbuf:     data buffer - if NULL only oob data are read/written
  80  * @oobbuf:     oob data buffer
  81  *
  82  * Note, it is allowed to read more than one OOB area at one go, but not write.
  83  * The interface assumes that the OOB write requests program only one page's
  84  * OOB area.
  85  */
  86 struct mtd_oob_ops {
  87         unsigned int    mode;
  88         size_t          len;
  89         size_t          retlen;
  90         size_t          ooblen;
  91         size_t          oobretlen;
  92         uint32_t        ooboffs;
  93         uint8_t         *datbuf;
  94         uint8_t         *oobbuf;
  95 };
  96
  97 #define MTD_MAX_OOBFREE_ENTRIES_LARGE   32
  98 #define MTD_MAX_ECCPOS_ENTRIES_LARGE    640
  99 /**
 100  * struct mtd_oob_region - oob region definition
 101  * @offset: region offset
 102  * @length: region length
 103  *
 104  * This structure describes a region of the OOB area, and is used
 105  * to retrieve ECC or free bytes sections.
 106  * Each section is defined by an offset within the OOB area and a
 107  * length.
 108  */
 109 struct mtd_oob_region {
 110         u32 offset;
 111         u32 length;
 112 };
 113
 114 /*
 115  * struct mtd_ooblayout_ops - NAND OOB layout operations
 116  * @ecc: function returning an ECC region in the OOB area.
 117  *       Should return -ERANGE if %section exceeds the total number of
 118  *       ECC sections.
 119  * @free: function returning a free region in the OOB area.
 120  *        Should return -ERANGE if %section exceeds the total number of
 121  *        free sections.
 122  */
 123 struct mtd_ooblayout_ops {
 124         int (*ecc)(struct mtd_info *mtd, int section,
 125                    struct mtd_oob_region *oobecc);
 126         int (*free)(struct mtd_info *mtd, int section,
 127                     struct mtd_oob_region *oobfree);
 128 };
 129
 130 struct module;  /* only needed for owner field in mtd_info */
 131
 132 struct mtd_info {
 133         u_char type;
 134         uint32_t flags;
 135         uint64_t size;   // Total size of the MTD
 136
 137         /* "Major" erase size for the device. Naïve users may take this
 138          * to be the only erase size available, or may use the more detailed
 139          * information below if they desire
 140          */
 141         uint32_t erasesize;
 142         /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
 143          * though individual bits can be cleared), in case of NAND flash it is
 144          * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
 145          * it is of ECC block size, etc. It is illegal to have writesize = 0.
 146          * Any driver registering a struct mtd_info must ensure a writesize of
 147          * 1 or larger.
 148          */
 149         uint32_t writesize;
 150
 151         /*
 152          * Size of the write buffer used by the MTD. MTD devices having a write
 153          * buffer can write multiple writesize chunks at a time. E.g. while
 154          * writing 4 * writesize bytes to a device with 2 * writesize bytes
 155          * buffer the MTD driver can (but doesn't have to) do 2 writesize
 156          * operations, but not 4. Currently, all NANDs have writebufsize
 157          * equivalent to writesize (NAND page size). Some NOR flashes do have
 158          * writebufsize greater than writesize.
 159          */
 160         uint32_t writebufsize;
 161
 162         uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
 163         uint32_t oobavail;  // Available OOB bytes per block
 164
 165         /*
 166          * If erasesize is a power of 2 then the shift is stored in
 167          * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
 168          */
 169         unsigned int erasesize_shift;
 170         unsigned int writesize_shift;
 171         /* Masks based on erasesize_shift and writesize_shift */
 172         unsigned int erasesize_mask;
 173         unsigned int writesize_mask;
 174
 175         /*
 176          * read ops return -EUCLEAN if max number of bitflips corrected on any
 177          * one region comprising an ecc step equals or exceeds this value.
 178          * Settable by driver, else defaults to ecc_strength.  User can override
 179          * in sysfs.  N.B. The meaning of the -EUCLEAN return code has changed;
 180          * see Documentation/ABI/testing/sysfs-class-mtd for more detail.
 181          */
 182         unsigned int bitflip_threshold;
 183
 184         // Kernel-only stuff starts here.
 185         const char *name;
 186         int index;
 187
 188         /* OOB layout description */
 189         const struct mtd_ooblayout_ops *ooblayout;
 190
 191         /* the ecc step size. */
 192         unsigned int ecc_step_size;
 193
 194         /* max number of correctible bit errors per ecc step */
 195         unsigned int ecc_strength;
 196
 197         /* Data for variable erase regions. If numeraseregions is zero,
 198          * it means that the whole device has erasesize as given above.
 199          */
 200         int numeraseregions;
 201         struct mtd_erase_region_info *eraseregions;
 202
 203         /*
 204          * Do not call via these pointers, use corresponding mtd_*()
 205          * wrappers instead.
 206          */
 207         int (*_erase) (struct mtd_info *mtd, struct erase_info *instr);
 208         int (*_point) (struct mtd_info *mtd, loff_t from, size_t len,
 209                        size_t *retlen, void **virt, resource_size_t *phys);
 210         int (*_unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
 211         unsigned long (*_get_unmapped_area) (struct mtd_info *mtd,
 212                                              unsigned long len,
 213                                              unsigned long offset,
 214                                              unsigned long flags);
 215         int (*_read) (struct mtd_info *mtd, loff_t from, size_t len,
 216                       size_t *retlen, u_char *buf);
 217         int (*_write) (struct mtd_info *mtd, loff_t to, size_t len,
 218                        size_t *retlen, const u_char *buf);
 219         int (*_panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
 220                              size_t *retlen, const u_char *buf);
 221         int (*_read_oob) (struct mtd_info *mtd, loff_t from,
 222                           struct mtd_oob_ops *ops);
 223         int (*_write_oob) (struct mtd_info *mtd, loff_t to,
 224                            struct mtd_oob_ops *ops);
 225         int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len,
 226                                     size_t *retlen, struct otp_info *buf);
 227         int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
 228                                     size_t len, size_t *retlen, u_char *buf);
 229         int (*_get_user_prot_info) (struct mtd_info *mtd, size_t len,
 230                                     size_t *retlen, struct otp_info *buf);
 231         int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 232                                     size_t len, size_t *retlen, u_char *buf);
 233         int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to,
 234                                      size_t len, size_t *retlen, u_char *buf);
 235         int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 236                                     size_t len);
 237         int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs,
 238                         unsigned long count, loff_t to, size_t *retlen);
 239         void (*_sync) (struct mtd_info *mtd);
 240         int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 241         int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 242         int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 243         int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs);
 244         int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs);
 245         int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
 246         int (*_suspend) (struct mtd_info *mtd);
 247         void (*_resume) (struct mtd_info *mtd);
 248         void (*_reboot) (struct mtd_info *mtd);
 249         /*
 250          * If the driver is something smart, like UBI, it may need to maintain
 251          * its own reference counting. The below functions are only for driver.
 252          */
 253         int (*_get_device) (struct mtd_info *mtd);
 254         void (*_put_device) (struct mtd_info *mtd);
 255
 256         /* Backing device capabilities for this device
 257          * - provides mmap capabilities
 258          */
 259         struct backing_dev_info *backing_dev_info;
 260
 261         struct notifier_block reboot_notifier;  /* default mode before reboot */
 262
 263         /* ECC status information */
 264         struct mtd_ecc_stats ecc_stats;
 265         /* Subpage shift (NAND) */
 266         int subpage_sft;
 267
 268         void *priv;
 269
 270         struct module *owner;
 271         struct device dev;
 272         int usecount;
 273 };
 274
 275 int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
 276                       struct mtd_oob_region *oobecc);
 277 int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
 278                                  int *section,
 279                                  struct mtd_oob_region *oobregion);
 280 int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
 281                                const u8 *oobbuf, int start, int nbytes);
 282 int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
 283                                u8 *oobbuf, int start, int nbytes);
 284 int mtd_ooblayout_free(struct mtd_info *mtd, int section,
 285                        struct mtd_oob_region *oobfree);
 286 int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
 287                                 const u8 *oobbuf, int start, int nbytes);
 288 int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 289                                 u8 *oobbuf, int start, int nbytes);
 290 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 291 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 292
 293 static inline void mtd_set_ooblayout(struct mtd_info *mtd,
 294                                      const struct mtd_ooblayout_ops *ooblayout)
 295 {
 296         mtd->ooblayout = ooblayout;
 297 }
 298
 299 static inline void mtd_set_of_node(struct mtd_info *mtd,
 300                                    struct device_node *np)
 301 {
 302         mtd->dev.of_node = np;
 303 }
 304
 305 static inline struct device_node *mtd_get_of_node(struct mtd_info *mtd)
 306 {
 307         return mtd->dev.of_node;
 308 }
 309
 310 static inline int mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops)
 311 {
 312         return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
 313 }
 314
 315 int mtd_erase(struct mtd_info *mtd, struct erase_info *instr);
 316 int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
 317               void **virt, resource_size_t *phys);
 318 int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
 319 unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
 320                                     unsigned long offset, unsigned long flags);
 321 int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
 322              u_char *buf);
 323 int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
 324               const u_char *buf);
 325 int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
 326                     const u_char *buf);
 327
 328 int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops);
 329 int mtd_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops);
 330
 331 int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
 332                            struct otp_info *buf);
 333 int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
 334                            size_t *retlen, u_char *buf);
 335 int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
 336                            struct otp_info *buf);
 337 int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
 338                            size_t *retlen, u_char *buf);
 339 int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
 340                             size_t *retlen, u_char *buf);
 341 int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);
 342
 343 int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 344                unsigned long count, loff_t to, size_t *retlen);
 345
 346 static inline void mtd_sync(struct mtd_info *mtd)
 347 {
 348         if (mtd->_sync)
 349                 mtd->_sync(mtd);
 350 }
 351
 352 int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 353 int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 354 int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 355 int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs);
 356 int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
 357 int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
 358
 359 static inline int mtd_suspend(struct mtd_info *mtd)
 360 {
 361         return mtd->_suspend ? mtd->_suspend(mtd) : 0;
 362 }
 363
 364 static inline void mtd_resume(struct mtd_info *mtd)
 365 {
 366         if (mtd->_resume)
 367                 mtd->_resume(mtd);
 368 }
 369
 370 static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
 371 {
 372         if (mtd->erasesize_shift)
 373                 return sz >> mtd->erasesize_shift;
 374         do_div(sz, mtd->erasesize);
 375         return sz;
 376 }
 377
 378 static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
 379 {
 380         if (mtd->erasesize_shift)
 381                 return sz & mtd->erasesize_mask;
 382         return do_div(sz, mtd->erasesize);
 383 }
 384
 385 static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
 386 {
 387         if (mtd->writesize_shift)
 388                 return sz >> mtd->writesize_shift;
 389         do_div(sz, mtd->writesize);
 390         return sz;
 391 }
 392
 393 static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
 394 {
 395         if (mtd->writesize_shift)
 396                 return sz & mtd->writesize_mask;
 397         return do_div(sz, mtd->writesize);
 398 }
 399
 400 static inline int mtd_has_oob(const struct mtd_info *mtd)
 401 {
 402         return mtd->_read_oob && mtd->_write_oob;
 403 }
 404
 405 static inline int mtd_type_is_nand(const struct mtd_info *mtd)
 406 {
 407         return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
 408 }
 409
 410 static inline int mtd_can_have_bb(const struct mtd_info *mtd)
 411 {
 412         return !!mtd->_block_isbad;
 413 }
 414
 415         /* Kernel-side ioctl definitions */
 416
 417 struct mtd_partition;
 418 struct mtd_part_parser_data;
 419
 420 extern int mtd_device_parse_register(struct mtd_info *mtd,
 421                                      const char * const *part_probe_types,
 422                                      struct mtd_part_parser_data *parser_data,
 423                                      const struct mtd_partition *defparts,
 424                                      int defnr_parts);
 425 #define mtd_device_register(master, parts, nr_parts)    \
 426         mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
 427 extern int mtd_device_unregister(struct mtd_info *master);
 428 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 429 extern int __get_mtd_device(struct mtd_info *mtd);
 430 extern void __put_mtd_device(struct mtd_info *mtd);
 431 extern struct mtd_info *get_mtd_device_nm(const char *name);
 432 extern void put_mtd_device(struct mtd_info *mtd);
 433
 434
 435 struct mtd_notifier {
 436         void (*add)(struct mtd_info *mtd);
 437         void (*remove)(struct mtd_info *mtd);
 438         struct list_head list;
 439 };
 440
 441
 442 extern void register_mtd_user (struct mtd_notifier *new);
 443 extern int unregister_mtd_user (struct mtd_notifier *old);
 444 void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
 445
 446 void mtd_erase_callback(struct erase_info *instr);
 447
 448 static inline int mtd_is_bitflip(int err) {
 449         return err == -EUCLEAN;
 450 }
 451
 452 static inline int mtd_is_eccerr(int err) {
 453         return err == -EBADMSG;
 454 }
 455
 456 static inline int mtd_is_bitflip_or_eccerr(int err) {
 457         return mtd_is_bitflip(err) || mtd_is_eccerr(err);
 458 }
 459
 460 unsigned mtd_mmap_capabilities(struct mtd_info *mtd);
 461
 462 #endif /* __MTD_MTD_H__ */