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_CHAR_MAJOR 90
  33 #define MTD_BLOCK_MAJOR 31
  34
  35 #define MTD_ERASE_PENDING       0x01
  36 #define MTD_ERASING             0x02
  37 #define MTD_ERASE_SUSPEND       0x04
  38 #define MTD_ERASE_DONE          0x08
  39 #define MTD_ERASE_FAILED        0x10
  40
  41 #define MTD_FAIL_ADDR_UNKNOWN -1LL
  42
  43 /*
  44  * If the erase fails, fail_addr might indicate exactly which block failed. If
  45  * fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level
  46  * or was not specific to any particular block.
  47  */
  48 struct erase_info {
  49         struct mtd_info *mtd;
  50         uint64_t addr;
  51         uint64_t len;
  52         uint64_t fail_addr;
  53         u_long time;
  54         u_long retries;
  55         unsigned dev;
  56         unsigned cell;
  57         void (*callback) (struct erase_info *self);
  58         u_long priv;
  59         u_char state;
  60         struct erase_info *next;
  61 };
  62
  63 struct mtd_erase_region_info {
  64         uint64_t offset;                /* At which this region starts, from the beginning of the MTD */
  65         uint32_t erasesize;             /* For this region */
  66         uint32_t numblocks;             /* Number of blocks of erasesize in this region */
  67         unsigned long *lockmap;         /* If keeping bitmap of locks */
  68 };
  69
  70 /**
  71  * struct mtd_oob_ops - oob operation operands
  72  * @mode:       operation mode
  73  *
  74  * @len:        number of data bytes to write/read
  75  *
  76  * @retlen:     number of data bytes written/read
  77  *
  78  * @ooblen:     number of oob bytes to write/read
  79  * @oobretlen:  number of oob bytes written/read
  80  * @ooboffs:    offset of oob data in the oob area (only relevant when
  81  *              mode = MTD_OPS_PLACE_OOB or MTD_OPS_RAW)
  82  * @datbuf:     data buffer - if NULL only oob data are read/written
  83  * @oobbuf:     oob data buffer
  84  *
  85  * Note, it is allowed to read more than one OOB area at one go, but not write.
  86  * The interface assumes that the OOB write requests program only one page's
  87  * OOB area.
  88  */
  89 struct mtd_oob_ops {
  90         unsigned int    mode;
  91         size_t          len;
  92         size_t          retlen;
  93         size_t          ooblen;
  94         size_t          oobretlen;
  95         uint32_t        ooboffs;
  96         uint8_t         *datbuf;
  97         uint8_t         *oobbuf;
  98 };
  99
 100 #define MTD_MAX_OOBFREE_ENTRIES_LARGE   32
 101 #define MTD_MAX_ECCPOS_ENTRIES_LARGE    448
 102 /*
 103  * Internal ECC layout control structure. For historical reasons, there is a
 104  * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
 105  * for export to user-space via the ECCGETLAYOUT ioctl.
 106  * nand_ecclayout should be expandable in the future simply by the above macros.
 107  */
 108 struct nand_ecclayout {
 109         __u32 eccbytes;
 110         __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
 111         __u32 oobavail;
 112         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 113 };
 114
 115 struct module;  /* only needed for owner field in mtd_info */
 116
 117 struct mtd_info {
 118         u_char type;
 119         uint32_t flags;
 120         uint64_t size;   // Total size of the MTD
 121
 122         /* "Major" erase size for the device. Naïve users may take this
 123          * to be the only erase size available, or may use the more detailed
 124          * information below if they desire
 125          */
 126         uint32_t erasesize;
 127         /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
 128          * though individual bits can be cleared), in case of NAND flash it is
 129          * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
 130          * it is of ECC block size, etc. It is illegal to have writesize = 0.
 131          * Any driver registering a struct mtd_info must ensure a writesize of
 132          * 1 or larger.
 133          */
 134         uint32_t writesize;
 135
 136         /*
 137          * Size of the write buffer used by the MTD. MTD devices having a write
 138          * buffer can write multiple writesize chunks at a time. E.g. while
 139          * writing 4 * writesize bytes to a device with 2 * writesize bytes
 140          * buffer the MTD driver can (but doesn't have to) do 2 writesize
 141          * operations, but not 4. Currently, all NANDs have writebufsize
 142          * equivalent to writesize (NAND page size). Some NOR flashes do have
 143          * writebufsize greater than writesize.
 144          */
 145         uint32_t writebufsize;
 146
 147         uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
 148         uint32_t oobavail;  // Available OOB bytes per block
 149
 150         /*
 151          * If erasesize is a power of 2 then the shift is stored in
 152          * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
 153          */
 154         unsigned int erasesize_shift;
 155         unsigned int writesize_shift;
 156         /* Masks based on erasesize_shift and writesize_shift */
 157         unsigned int erasesize_mask;
 158         unsigned int writesize_mask;
 159
 160         // Kernel-only stuff starts here.
 161         const char *name;
 162         int index;
 163
 164         /* ECC layout structure pointer - read only! */
 165         struct nand_ecclayout *ecclayout;
 166
 167         /* Data for variable erase regions. If numeraseregions is zero,
 168          * it means that the whole device has erasesize as given above.
 169          */
 170         int numeraseregions;
 171         struct mtd_erase_region_info *eraseregions;
 172
 173         /*
 174          * Do not call via these pointers, use corresponding mtd_*()
 175          * wrappers instead.
 176          */
 177         int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
 178         int (*point) (struct mtd_info *mtd, loff_t from, size_t len,
 179                       size_t *retlen, void **virt, resource_size_t *phys);
 180         void (*unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
 181         unsigned long (*get_unmapped_area) (struct mtd_info *mtd,
 182                                             unsigned long len,
 183                                             unsigned long offset,
 184                                             unsigned long flags);
 185         int (*read) (struct mtd_info *mtd, loff_t from, size_t len,
 186                      size_t *retlen, u_char *buf);
 187         int (*write) (struct mtd_info *mtd, loff_t to, size_t len,
 188                       size_t *retlen, const u_char *buf);
 189         int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
 190                             size_t *retlen, const u_char *buf);
 191         int (*read_oob) (struct mtd_info *mtd, loff_t from,
 192                          struct mtd_oob_ops *ops);
 193         int (*write_oob) (struct mtd_info *mtd, loff_t to,
 194                           struct mtd_oob_ops *ops);
 195         int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf,
 196                                    size_t len);
 197         int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
 198                                    size_t len, size_t *retlen, u_char *buf);
 199         int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf,
 200                                    size_t len);
 201         int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 202                                    size_t len, size_t *retlen, u_char *buf);
 203         int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t to, size_t len,
 204                                     size_t *retlen, u_char *buf);
 205         int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 206                                    size_t len);
 207         int (*writev) (struct mtd_info *mtd, const struct kvec *vecs,
 208                         unsigned long count, loff_t to, size_t *retlen);
 209         void (*sync) (struct mtd_info *mtd);
 210         int (*lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 211         int (*unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 212         int (*is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 213         int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
 214         int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
 215         int (*suspend) (struct mtd_info *mtd);
 216         void (*resume) (struct mtd_info *mtd);
 217         /*
 218          * If the driver is something smart, like UBI, it may need to maintain
 219          * its own reference counting. The below functions are only for driver.
 220          */
 221         int (*get_device) (struct mtd_info *mtd);
 222         void (*put_device) (struct mtd_info *mtd);
 223
 224         /* Backing device capabilities for this device
 225          * - provides mmap capabilities
 226          */
 227         struct backing_dev_info *backing_dev_info;
 228
 229         struct notifier_block reboot_notifier;  /* default mode before reboot */
 230
 231         /* ECC status information */
 232         struct mtd_ecc_stats ecc_stats;
 233         /* Subpage shift (NAND) */
 234         int subpage_sft;
 235
 236         void *priv;
 237
 238         struct module *owner;
 239         struct device dev;
 240         int usecount;
 241 };
 242
 243 /*
 244  * Erase is an asynchronous operation.  Device drivers are supposed
 245  * to call instr->callback() whenever the operation completes, even
 246  * if it completes with a failure.
 247  * Callers are supposed to pass a callback function and wait for it
 248  * to be called before writing to the block.
 249  */
 250 static inline int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
 251 {
 252         return mtd->erase(mtd, instr);
 253 }
 254
 255 /*
 256  * This stuff for eXecute-In-Place. phys is optional and may be set to NULL.
 257  */
 258 static inline int mtd_point(struct mtd_info *mtd, loff_t from, size_t len,
 259                             size_t *retlen, void **virt, resource_size_t *phys)
 260 {
 261         *retlen = 0;
 262         if (!mtd->point)
 263                 return -EOPNOTSUPP;
 264         return mtd->point(mtd, from, len, retlen, virt, phys);
 265 }
 266
 267 /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
 268 static inline void mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
 269 {
 270         return mtd->unpoint(mtd, from, len);
 271 }
 272
 273 /*
 274  * Allow NOMMU mmap() to directly map the device (if not NULL)
 275  * - return the address to which the offset maps
 276  * - return -ENOSYS to indicate refusal to do the mapping
 277  */
 278 static inline unsigned long mtd_get_unmapped_area(struct mtd_info *mtd,
 279                                                   unsigned long len,
 280                                                   unsigned long offset,
 281                                                   unsigned long flags)
 282 {
 283         if (!mtd->get_unmapped_area)
 284                 return -EOPNOTSUPP;
 285         return mtd->get_unmapped_area(mtd, len, offset, flags);
 286 }
 287
 288 static inline int mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
 289                            size_t *retlen, u_char *buf)
 290 {
 291         return mtd->read(mtd, from, len, retlen, buf);
 292 }
 293
 294 static inline int mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
 295                             size_t *retlen, const u_char *buf)
 296 {
 297         *retlen = 0;
 298         if (!mtd->write)
 299                 return -EROFS;
 300         return mtd->write(mtd, to, len, retlen, buf);
 301 }
 302
 303 /*
 304  * In blackbox flight recorder like scenarios we want to make successful writes
 305  * in interrupt context. panic_write() is only intended to be called when its
 306  * known the kernel is about to panic and we need the write to succeed. Since
 307  * the kernel is not going to be running for much longer, this function can
 308  * break locks and delay to ensure the write succeeds (but not sleep).
 309  */
 310 static inline int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
 311                                   size_t *retlen, const u_char *buf)
 312 {
 313         *retlen = 0;
 314         if (!mtd->panic_write)
 315                 return -EOPNOTSUPP;
 316         return mtd->panic_write(mtd, to, len, retlen, buf);
 317 }
 318
 319 static inline int mtd_read_oob(struct mtd_info *mtd, loff_t from,
 320                                struct mtd_oob_ops *ops)
 321 {
 322         ops->retlen = ops->oobretlen = 0;
 323         if (!mtd->read_oob)
 324                 return -EOPNOTSUPP;
 325         return mtd->read_oob(mtd, from, ops);
 326 }
 327
 328 static inline int mtd_write_oob(struct mtd_info *mtd, loff_t to,
 329                                 struct mtd_oob_ops *ops)
 330 {
 331         ops->retlen = ops->oobretlen = 0;
 332         if (!mtd->write_oob)
 333                 return -EOPNOTSUPP;
 334         return mtd->write_oob(mtd, to, ops);
 335 }
 336
 337 /*
 338  * Method to access the protection register area, present in some flash
 339  * devices. The user data is one time programmable but the factory data is read
 340  * only.
 341  */
 342 static inline int mtd_get_fact_prot_info(struct mtd_info *mtd,
 343                                          struct otp_info *buf, size_t len)
 344 {
 345         if (!mtd->get_fact_prot_info)
 346                 return -EOPNOTSUPP;
 347         return mtd->get_fact_prot_info(mtd, buf, len);
 348 }
 349
 350 static inline int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
 351                                          size_t len, size_t *retlen,
 352                                          u_char *buf)
 353 {
 354         *retlen = 0;
 355         if (!mtd->read_fact_prot_reg)
 356                 return -EOPNOTSUPP;
 357         return mtd->read_fact_prot_reg(mtd, from, len, retlen, buf);
 358 }
 359
 360 static inline int mtd_get_user_prot_info(struct mtd_info *mtd,
 361                                          struct otp_info *buf,
 362                                          size_t len)
 363 {
 364         if (!mtd->get_user_prot_info)
 365                 return -EOPNOTSUPP;
 366         return mtd->get_user_prot_info(mtd, buf, len);
 367 }
 368
 369 static inline int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
 370                                          size_t len, size_t *retlen,
 371                                          u_char *buf)
 372 {
 373         *retlen = 0;
 374         if (!mtd->read_user_prot_reg)
 375                 return -EOPNOTSUPP;
 376         return mtd->read_user_prot_reg(mtd, from, len, retlen, buf);
 377 }
 378
 379 static inline int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to,
 380                                           size_t len, size_t *retlen,
 381                                           u_char *buf)
 382 {
 383         *retlen = 0;
 384         if (!mtd->write_user_prot_reg)
 385                 return -EOPNOTSUPP;
 386         return mtd->write_user_prot_reg(mtd, to, len, retlen, buf);
 387 }
 388
 389 static inline int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
 390                                          size_t len)
 391 {
 392         if (!mtd->lock_user_prot_reg)
 393                 return -EOPNOTSUPP;
 394         return mtd->lock_user_prot_reg(mtd, from, len);
 395 }
 396
 397 int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 398                unsigned long count, loff_t to, size_t *retlen);
 399
 400 static inline void mtd_sync(struct mtd_info *mtd)
 401 {
 402         if (mtd->sync)
 403                 mtd->sync(mtd);
 404 }
 405
 406 /* Chip-supported device locking */
 407 static inline int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 408 {
 409         if (!mtd->lock)
 410                 return -EOPNOTSUPP;
 411         return mtd->lock(mtd, ofs, len);
 412 }
 413
 414 static inline int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 415 {
 416         if (!mtd->unlock)
 417                 return -EOPNOTSUPP;
 418         return mtd->unlock(mtd, ofs, len);
 419 }
 420
 421 static inline int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 422 {
 423         if (!mtd->is_locked)
 424                 return -EOPNOTSUPP;
 425         return mtd->is_locked(mtd, ofs, len);
 426 }
 427
 428 static inline int mtd_suspend(struct mtd_info *mtd)
 429 {
 430         return mtd->suspend(mtd);
 431 }
 432
 433 static inline void mtd_resume(struct mtd_info *mtd)
 434 {
 435         mtd->resume(mtd);
 436 }
 437
 438 static inline int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
 439 {
 440         return mtd->block_isbad(mtd, ofs);
 441 }
 442
 443 static inline int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs)
 444 {
 445         return mtd->block_markbad(mtd, ofs);
 446 }
 447
 448 static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
 449 {
 450         if (mtd->erasesize_shift)
 451                 return sz >> mtd->erasesize_shift;
 452         do_div(sz, mtd->erasesize);
 453         return sz;
 454 }
 455
 456 static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
 457 {
 458         if (mtd->erasesize_shift)
 459                 return sz & mtd->erasesize_mask;
 460         return do_div(sz, mtd->erasesize);
 461 }
 462
 463 static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
 464 {
 465         if (mtd->writesize_shift)
 466                 return sz >> mtd->writesize_shift;
 467         do_div(sz, mtd->writesize);
 468         return sz;
 469 }
 470
 471 static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
 472 {
 473         if (mtd->writesize_shift)
 474                 return sz & mtd->writesize_mask;
 475         return do_div(sz, mtd->writesize);
 476 }
 477
 478 static inline int mtd_has_oob(const struct mtd_info *mtd)
 479 {
 480         return mtd->read_oob && mtd->write_oob;
 481 }
 482
 483         /* Kernel-side ioctl definitions */
 484
 485 struct mtd_partition;
 486 struct mtd_part_parser_data;
 487
 488 extern int mtd_device_parse_register(struct mtd_info *mtd,
 489                               const char **part_probe_types,
 490                               struct mtd_part_parser_data *parser_data,
 491                               const struct mtd_partition *defparts,
 492                               int defnr_parts);
 493 #define mtd_device_register(master, parts, nr_parts)    \
 494         mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
 495 extern int mtd_device_unregister(struct mtd_info *master);
 496 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 497 extern int __get_mtd_device(struct mtd_info *mtd);
 498 extern void __put_mtd_device(struct mtd_info *mtd);
 499 extern struct mtd_info *get_mtd_device_nm(const char *name);
 500 extern void put_mtd_device(struct mtd_info *mtd);
 501
 502
 503 struct mtd_notifier {
 504         void (*add)(struct mtd_info *mtd);
 505         void (*remove)(struct mtd_info *mtd);
 506         struct list_head list;
 507 };
 508
 509
 510 extern void register_mtd_user (struct mtd_notifier *new);
 511 extern int unregister_mtd_user (struct mtd_notifier *old);
 512 void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
 513
 514 void mtd_erase_callback(struct erase_info *instr);
 515
 516 static inline int mtd_is_bitflip(int err) {
 517         return err == -EUCLEAN;
 518 }
 519
 520 static inline int mtd_is_eccerr(int err) {
 521         return err == -EBADMSG;
 522 }
 523
 524 static inline int mtd_is_bitflip_or_eccerr(int err) {
 525         return mtd_is_bitflip(err) || mtd_is_eccerr(err);
 526 }
 527
 528 #endif /* __MTD_MTD_H__ */