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  * Internal ECC layout control structure. For historical reasons, there is a
 101  * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
 102  * for export to user-space via the ECCGETLAYOUT ioctl.
 103  * nand_ecclayout should be expandable in the future simply by the above macros.
 104  */
 105 struct nand_ecclayout {
 106         __u32 eccbytes;
 107         __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
 108         __u32 oobavail;
 109         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 110 };
 111
 112 struct module;  /* only needed for owner field in mtd_info */
 113
 114 struct mtd_info {
 115         u_char type;
 116         uint32_t flags;
 117         uint64_t size;   // Total size of the MTD
 118
 119         /* "Major" erase size for the device. Naïve users may take this
 120          * to be the only erase size available, or may use the more detailed
 121          * information below if they desire
 122          */
 123         uint32_t erasesize;
 124         /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
 125          * though individual bits can be cleared), in case of NAND flash it is
 126          * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
 127          * it is of ECC block size, etc. It is illegal to have writesize = 0.
 128          * Any driver registering a struct mtd_info must ensure a writesize of
 129          * 1 or larger.
 130          */
 131         uint32_t writesize;
 132
 133         /*
 134          * Size of the write buffer used by the MTD. MTD devices having a write
 135          * buffer can write multiple writesize chunks at a time. E.g. while
 136          * writing 4 * writesize bytes to a device with 2 * writesize bytes
 137          * buffer the MTD driver can (but doesn't have to) do 2 writesize
 138          * operations, but not 4. Currently, all NANDs have writebufsize
 139          * equivalent to writesize (NAND page size). Some NOR flashes do have
 140          * writebufsize greater than writesize.
 141          */
 142         uint32_t writebufsize;
 143
 144         uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
 145         uint32_t oobavail;  // Available OOB bytes per block
 146
 147         /*
 148          * If erasesize is a power of 2 then the shift is stored in
 149          * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
 150          */
 151         unsigned int erasesize_shift;
 152         unsigned int writesize_shift;
 153         /* Masks based on erasesize_shift and writesize_shift */
 154         unsigned int erasesize_mask;
 155         unsigned int writesize_mask;
 156
 157         /*
 158          * read ops return -EUCLEAN if max number of bitflips corrected on any
 159          * one region comprising an ecc step equals or exceeds this value.
 160          * Settable by driver, else defaults to ecc_strength.  User can override
 161          * in sysfs.  N.B. The meaning of the -EUCLEAN return code has changed;
 162          * see Documentation/ABI/testing/sysfs-class-mtd for more detail.
 163          */
 164         unsigned int bitflip_threshold;
 165
 166         // Kernel-only stuff starts here.
 167         const char *name;
 168         int index;
 169
 170         /* ECC layout structure pointer - read only! */
 171         struct nand_ecclayout *ecclayout;
 172
 173         /* the ecc step size. */
 174         unsigned int ecc_step_size;
 175
 176         /* max number of correctible bit errors per ecc step */
 177         unsigned int ecc_strength;
 178
 179         /* Data for variable erase regions. If numeraseregions is zero,
 180          * it means that the whole device has erasesize as given above.
 181          */
 182         int numeraseregions;
 183         struct mtd_erase_region_info *eraseregions;
 184
 185         /*
 186          * Do not call via these pointers, use corresponding mtd_*()
 187          * wrappers instead.
 188          */
 189         int (*_erase) (struct mtd_info *mtd, struct erase_info *instr);
 190         int (*_point) (struct mtd_info *mtd, loff_t from, size_t len,
 191                        size_t *retlen, void **virt, resource_size_t *phys);
 192         int (*_unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
 193         unsigned long (*_get_unmapped_area) (struct mtd_info *mtd,
 194                                              unsigned long len,
 195                                              unsigned long offset,
 196                                              unsigned long flags);
 197         int (*_read) (struct mtd_info *mtd, loff_t from, size_t len,
 198                       size_t *retlen, u_char *buf);
 199         int (*_write) (struct mtd_info *mtd, loff_t to, size_t len,
 200                        size_t *retlen, const u_char *buf);
 201         int (*_panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
 202                              size_t *retlen, const u_char *buf);
 203         int (*_read_oob) (struct mtd_info *mtd, loff_t from,
 204                           struct mtd_oob_ops *ops);
 205         int (*_write_oob) (struct mtd_info *mtd, loff_t to,
 206                            struct mtd_oob_ops *ops);
 207         int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len,
 208                                     size_t *retlen, struct otp_info *buf);
 209         int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
 210                                     size_t len, size_t *retlen, u_char *buf);
 211         int (*_get_user_prot_info) (struct mtd_info *mtd, size_t len,
 212                                     size_t *retlen, struct otp_info *buf);
 213         int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 214                                     size_t len, size_t *retlen, u_char *buf);
 215         int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to,
 216                                      size_t len, size_t *retlen, u_char *buf);
 217         int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 218                                     size_t len);
 219         int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs,
 220                         unsigned long count, loff_t to, size_t *retlen);
 221         void (*_sync) (struct mtd_info *mtd);
 222         int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 223         int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 224         int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 225         int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs);
 226         int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs);
 227         int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
 228         int (*_suspend) (struct mtd_info *mtd);
 229         void (*_resume) (struct mtd_info *mtd);
 230         void (*_reboot) (struct mtd_info *mtd);
 231         /*
 232          * If the driver is something smart, like UBI, it may need to maintain
 233          * its own reference counting. The below functions are only for driver.
 234          */
 235         int (*_get_device) (struct mtd_info *mtd);
 236         void (*_put_device) (struct mtd_info *mtd);
 237
 238         /* Backing device capabilities for this device
 239          * - provides mmap capabilities
 240          */
 241         struct backing_dev_info *backing_dev_info;
 242
 243         struct notifier_block reboot_notifier;  /* default mode before reboot */
 244
 245         /* ECC status information */
 246         struct mtd_ecc_stats ecc_stats;
 247         /* Subpage shift (NAND) */
 248         int subpage_sft;
 249
 250         void *priv;
 251
 252         struct module *owner;
 253         struct device dev;
 254         int usecount;
 255 };
 256
 257 int mtd_erase(struct mtd_info *mtd, struct erase_info *instr);
 258 int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
 259               void **virt, resource_size_t *phys);
 260 int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
 261 unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
 262                                     unsigned long offset, unsigned long flags);
 263 int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
 264              u_char *buf);
 265 int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
 266               const u_char *buf);
 267 int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
 268                     const u_char *buf);
 269
 270 int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops);
 271
 272 static inline int mtd_write_oob(struct mtd_info *mtd, loff_t to,
 273                                 struct mtd_oob_ops *ops)
 274 {
 275         ops->retlen = ops->oobretlen = 0;
 276         if (!mtd->_write_oob)
 277                 return -EOPNOTSUPP;
 278         if (!(mtd->flags & MTD_WRITEABLE))
 279                 return -EROFS;
 280         return mtd->_write_oob(mtd, to, ops);
 281 }
 282
 283 int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
 284                            struct otp_info *buf);
 285 int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
 286                            size_t *retlen, u_char *buf);
 287 int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
 288                            struct otp_info *buf);
 289 int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
 290                            size_t *retlen, u_char *buf);
 291 int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
 292                             size_t *retlen, u_char *buf);
 293 int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);
 294
 295 int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 296                unsigned long count, loff_t to, size_t *retlen);
 297
 298 static inline void mtd_sync(struct mtd_info *mtd)
 299 {
 300         if (mtd->_sync)
 301                 mtd->_sync(mtd);
 302 }
 303
 304 int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 305 int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 306 int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 307 int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs);
 308 int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
 309 int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
 310
 311 static inline int mtd_suspend(struct mtd_info *mtd)
 312 {
 313         return mtd->_suspend ? mtd->_suspend(mtd) : 0;
 314 }
 315
 316 static inline void mtd_resume(struct mtd_info *mtd)
 317 {
 318         if (mtd->_resume)
 319                 mtd->_resume(mtd);
 320 }
 321
 322 static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
 323 {
 324         if (mtd->erasesize_shift)
 325                 return sz >> mtd->erasesize_shift;
 326         do_div(sz, mtd->erasesize);
 327         return sz;
 328 }
 329
 330 static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
 331 {
 332         if (mtd->erasesize_shift)
 333                 return sz & mtd->erasesize_mask;
 334         return do_div(sz, mtd->erasesize);
 335 }
 336
 337 static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
 338 {
 339         if (mtd->writesize_shift)
 340                 return sz >> mtd->writesize_shift;
 341         do_div(sz, mtd->writesize);
 342         return sz;
 343 }
 344
 345 static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
 346 {
 347         if (mtd->writesize_shift)
 348                 return sz & mtd->writesize_mask;
 349         return do_div(sz, mtd->writesize);
 350 }
 351
 352 static inline int mtd_has_oob(const struct mtd_info *mtd)
 353 {
 354         return mtd->_read_oob && mtd->_write_oob;
 355 }
 356
 357 static inline int mtd_type_is_nand(const struct mtd_info *mtd)
 358 {
 359         return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
 360 }
 361
 362 static inline int mtd_can_have_bb(const struct mtd_info *mtd)
 363 {
 364         return !!mtd->_block_isbad;
 365 }
 366
 367         /* Kernel-side ioctl definitions */
 368
 369 struct mtd_partition;
 370 struct mtd_part_parser_data;
 371
 372 extern int mtd_device_parse_register(struct mtd_info *mtd,
 373                                      const char * const *part_probe_types,
 374                                      struct mtd_part_parser_data *parser_data,
 375                                      const struct mtd_partition *defparts,
 376                                      int defnr_parts);
 377 #define mtd_device_register(master, parts, nr_parts)    \
 378         mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
 379 extern int mtd_device_unregister(struct mtd_info *master);
 380 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 381 extern int __get_mtd_device(struct mtd_info *mtd);
 382 extern void __put_mtd_device(struct mtd_info *mtd);
 383 extern struct mtd_info *get_mtd_device_nm(const char *name);
 384 extern void put_mtd_device(struct mtd_info *mtd);
 385
 386
 387 struct mtd_notifier {
 388         void (*add)(struct mtd_info *mtd);
 389         void (*remove)(struct mtd_info *mtd);
 390         struct list_head list;
 391 };
 392
 393
 394 extern void register_mtd_user (struct mtd_notifier *new);
 395 extern int unregister_mtd_user (struct mtd_notifier *old);
 396 void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
 397
 398 void mtd_erase_callback(struct erase_info *instr);
 399
 400 static inline int mtd_is_bitflip(int err) {
 401         return err == -EUCLEAN;
 402 }
 403
 404 static inline int mtd_is_eccerr(int err) {
 405         return err == -EBADMSG;
 406 }
 407
 408 static inline int mtd_is_bitflip_or_eccerr(int err) {
 409         return mtd_is_bitflip(err) || mtd_is_eccerr(err);
 410 }
 411
 412 unsigned mtd_mmap_capabilities(struct mtd_info *mtd);
 413
 414 #endif /* __MTD_MTD_H__ */