1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al. 4 * 5 */ 6 7 #ifndef __MTD_MTD_H__ 8 #define __MTD_MTD_H__ 9 10 #ifndef __UBOOT__ 11 #include <linux/types.h> 12 #include <linux/uio.h> 13 #include <linux/notifier.h> 14 #include <linux/device.h> 15 16 #include <mtd/mtd-abi.h> 17 18 #include <asm/div64.h> 19 #else 20 #include <linux/compat.h> 21 #include <mtd/mtd-abi.h> 22 #include <linux/errno.h> 23 #include <div64.h> 24 25 #define MAX_MTD_DEVICES 32 26 #endif 27 28 #define MTD_ERASE_PENDING 0x01 29 #define MTD_ERASING 0x02 30 #define MTD_ERASE_SUSPEND 0x04 31 #define MTD_ERASE_DONE 0x08 32 #define MTD_ERASE_FAILED 0x10 33 34 #define MTD_FAIL_ADDR_UNKNOWN -1LL 35 36 /* 37 * If the erase fails, fail_addr might indicate exactly which block failed. If 38 * fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level 39 * or was not specific to any particular block. 40 */ 41 struct erase_info { 42 struct mtd_info *mtd; 43 uint64_t addr; 44 uint64_t len; 45 uint64_t fail_addr; 46 u_long time; 47 u_long retries; 48 unsigned dev; 49 unsigned cell; 50 void (*callback) (struct erase_info *self); 51 u_long priv; 52 u_char state; 53 struct erase_info *next; 54 int scrub; 55 }; 56 57 struct mtd_erase_region_info { 58 uint64_t offset; /* At which this region starts, from the beginning of the MTD */ 59 uint32_t erasesize; /* For this region */ 60 uint32_t numblocks; /* Number of blocks of erasesize in this region */ 61 unsigned long *lockmap; /* If keeping bitmap of locks */ 62 }; 63 64 /** 65 * struct mtd_oob_ops - oob operation operands 66 * @mode: operation mode 67 * 68 * @len: number of data bytes to write/read 69 * 70 * @retlen: number of data bytes written/read 71 * 72 * @ooblen: number of oob bytes to write/read 73 * @oobretlen: number of oob bytes written/read 74 * @ooboffs: offset of oob data in the oob area (only relevant when 75 * mode = MTD_OPS_PLACE_OOB or MTD_OPS_RAW) 76 * @datbuf: data buffer - if NULL only oob data are read/written 77 * @oobbuf: oob data buffer 78 */ 79 struct mtd_oob_ops { 80 unsigned int mode; 81 size_t len; 82 size_t retlen; 83 size_t ooblen; 84 size_t oobretlen; 85 uint32_t ooboffs; 86 uint8_t *datbuf; 87 uint8_t *oobbuf; 88 }; 89 90 #ifdef CONFIG_SYS_NAND_MAX_OOBFREE 91 #define MTD_MAX_OOBFREE_ENTRIES_LARGE CONFIG_SYS_NAND_MAX_OOBFREE 92 #else 93 #define MTD_MAX_OOBFREE_ENTRIES_LARGE 32 94 #endif 95 96 #ifdef CONFIG_SYS_NAND_MAX_ECCPOS 97 #define MTD_MAX_ECCPOS_ENTRIES_LARGE CONFIG_SYS_NAND_MAX_ECCPOS 98 #else 99 #define MTD_MAX_ECCPOS_ENTRIES_LARGE 680 100 #endif 101 /** 102 * struct mtd_oob_region - oob region definition 103 * @offset: region offset 104 * @length: region length 105 * 106 * This structure describes a region of the OOB area, and is used 107 * to retrieve ECC or free bytes sections. 108 * Each section is defined by an offset within the OOB area and a 109 * length. 110 */ 111 struct mtd_oob_region { 112 u32 offset; 113 u32 length; 114 }; 115 116 /* 117 * struct mtd_ooblayout_ops - NAND OOB layout operations 118 * @ecc: function returning an ECC region in the OOB area. 119 * Should return -ERANGE if %section exceeds the total number of 120 * ECC sections. 121 * @free: function returning a free region in the OOB area. 122 * Should return -ERANGE if %section exceeds the total number of 123 * free sections. 124 */ 125 struct mtd_ooblayout_ops { 126 int (*ecc)(struct mtd_info *mtd, int section, 127 struct mtd_oob_region *oobecc); 128 int (*free)(struct mtd_info *mtd, int section, 129 struct mtd_oob_region *oobfree); 130 }; 131 132 /* 133 * Internal ECC layout control structure. For historical reasons, there is a 134 * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained 135 * for export to user-space via the ECCGETLAYOUT ioctl. 136 * nand_ecclayout should be expandable in the future simply by the above macros. 137 */ 138 struct nand_ecclayout { 139 __u32 eccbytes; 140 __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE]; 141 __u32 oobavail; 142 struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE]; 143 }; 144 145 struct module; /* only needed for owner field in mtd_info */ 146 147 struct mtd_info { 148 u_char type; 149 uint32_t flags; 150 uint64_t size; // Total size of the MTD 151 152 /* "Major" erase size for the device. Naïve users may take this 153 * to be the only erase size available, or may use the more detailed 154 * information below if they desire 155 */ 156 uint32_t erasesize; 157 /* Minimal writable flash unit size. In case of NOR flash it is 1 (even 158 * though individual bits can be cleared), in case of NAND flash it is 159 * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR 160 * it is of ECC block size, etc. It is illegal to have writesize = 0. 161 * Any driver registering a struct mtd_info must ensure a writesize of 162 * 1 or larger. 163 */ 164 uint32_t writesize; 165 166 /* 167 * Size of the write buffer used by the MTD. MTD devices having a write 168 * buffer can write multiple writesize chunks at a time. E.g. while 169 * writing 4 * writesize bytes to a device with 2 * writesize bytes 170 * buffer the MTD driver can (but doesn't have to) do 2 writesize 171 * operations, but not 4. Currently, all NANDs have writebufsize 172 * equivalent to writesize (NAND page size). Some NOR flashes do have 173 * writebufsize greater than writesize. 174 */ 175 uint32_t writebufsize; 176 177 uint32_t oobsize; // Amount of OOB data per block (e.g. 16) 178 uint32_t oobavail; // Available OOB bytes per block 179 180 /* 181 * If erasesize is a power of 2 then the shift is stored in 182 * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize. 183 */ 184 unsigned int erasesize_shift; 185 unsigned int writesize_shift; 186 /* Masks based on erasesize_shift and writesize_shift */ 187 unsigned int erasesize_mask; 188 unsigned int writesize_mask; 189 190 /* 191 * read ops return -EUCLEAN if max number of bitflips corrected on any 192 * one region comprising an ecc step equals or exceeds this value. 193 * Settable by driver, else defaults to ecc_strength. User can override 194 * in sysfs. N.B. The meaning of the -EUCLEAN return code has changed; 195 * see Documentation/ABI/testing/sysfs-class-mtd for more detail. 196 */ 197 unsigned int bitflip_threshold; 198 199 // Kernel-only stuff starts here. 200 #ifndef __UBOOT__ 201 const char *name; 202 #else 203 char *name; 204 #endif 205 int index; 206 207 /* OOB layout description */ 208 const struct mtd_ooblayout_ops *ooblayout; 209 210 /* ECC layout structure pointer - read only! */ 211 struct nand_ecclayout *ecclayout; 212 213 /* the ecc step size. */ 214 unsigned int ecc_step_size; 215 216 /* max number of correctible bit errors per ecc step */ 217 unsigned int ecc_strength; 218 219 /* Data for variable erase regions. If numeraseregions is zero, 220 * it means that the whole device has erasesize as given above. 221 */ 222 int numeraseregions; 223 struct mtd_erase_region_info *eraseregions; 224 225 /* 226 * Do not call via these pointers, use corresponding mtd_*() 227 * wrappers instead. 228 */ 229 int (*_erase) (struct mtd_info *mtd, struct erase_info *instr); 230 #ifndef __UBOOT__ 231 int (*_point) (struct mtd_info *mtd, loff_t from, size_t len, 232 size_t *retlen, void **virt, resource_size_t *phys); 233 int (*_unpoint) (struct mtd_info *mtd, loff_t from, size_t len); 234 #endif 235 unsigned long (*_get_unmapped_area) (struct mtd_info *mtd, 236 unsigned long len, 237 unsigned long offset, 238 unsigned long flags); 239 int (*_read) (struct mtd_info *mtd, loff_t from, size_t len, 240 size_t *retlen, u_char *buf); 241 int (*_write) (struct mtd_info *mtd, loff_t to, size_t len, 242 size_t *retlen, const u_char *buf); 243 int (*_panic_write) (struct mtd_info *mtd, loff_t to, size_t len, 244 size_t *retlen, const u_char *buf); 245 int (*_read_oob) (struct mtd_info *mtd, loff_t from, 246 struct mtd_oob_ops *ops); 247 int (*_write_oob) (struct mtd_info *mtd, loff_t to, 248 struct mtd_oob_ops *ops); 249 int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len, 250 size_t *retlen, struct otp_info *buf); 251 int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, 252 size_t len, size_t *retlen, u_char *buf); 253 int (*_get_user_prot_info) (struct mtd_info *mtd, size_t len, 254 size_t *retlen, struct otp_info *buf); 255 int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from, 256 size_t len, size_t *retlen, u_char *buf); 257 int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to, 258 size_t len, size_t *retlen, u_char *buf); 259 int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, 260 size_t len); 261 #ifndef __UBOOT__ 262 int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs, 263 unsigned long count, loff_t to, size_t *retlen); 264 #endif 265 void (*_sync) (struct mtd_info *mtd); 266 int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len); 267 int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len); 268 int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len); 269 int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs); 270 int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs); 271 int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs); 272 #ifndef __UBOOT__ 273 int (*_suspend) (struct mtd_info *mtd); 274 void (*_resume) (struct mtd_info *mtd); 275 void (*_reboot) (struct mtd_info *mtd); 276 #endif 277 /* 278 * If the driver is something smart, like UBI, it may need to maintain 279 * its own reference counting. The below functions are only for driver. 280 */ 281 int (*_get_device) (struct mtd_info *mtd); 282 void (*_put_device) (struct mtd_info *mtd); 283 284 #ifndef __UBOOT__ 285 /* Backing device capabilities for this device 286 * - provides mmap capabilities 287 */ 288 struct backing_dev_info *backing_dev_info; 289 290 struct notifier_block reboot_notifier; /* default mode before reboot */ 291 #endif 292 293 /* ECC status information */ 294 struct mtd_ecc_stats ecc_stats; 295 /* Subpage shift (NAND) */ 296 int subpage_sft; 297 298 void *priv; 299 300 struct module *owner; 301 #ifndef __UBOOT__ 302 struct device dev; 303 #else 304 struct udevice *dev; 305 #endif 306 int usecount; 307 }; 308 309 int mtd_ooblayout_ecc(struct mtd_info *mtd, int section, 310 struct mtd_oob_region *oobecc); 311 int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte, 312 int *section, 313 struct mtd_oob_region *oobregion); 314 int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf, 315 const u8 *oobbuf, int start, int nbytes); 316 int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf, 317 u8 *oobbuf, int start, int nbytes); 318 int mtd_ooblayout_free(struct mtd_info *mtd, int section, 319 struct mtd_oob_region *oobfree); 320 int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf, 321 const u8 *oobbuf, int start, int nbytes); 322 int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf, 323 u8 *oobbuf, int start, int nbytes); 324 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd); 325 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd); 326 327 static inline void mtd_set_ooblayout(struct mtd_info *mtd, 328 const struct mtd_ooblayout_ops *ooblayout) 329 { 330 mtd->ooblayout = ooblayout; 331 } 332 333 static inline int mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops) 334 { 335 return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize; 336 } 337 338 int mtd_erase(struct mtd_info *mtd, struct erase_info *instr); 339 #ifndef __UBOOT__ 340 int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, 341 void **virt, resource_size_t *phys); 342 int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len); 343 #endif 344 unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len, 345 unsigned long offset, unsigned long flags); 346 int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, 347 u_char *buf); 348 int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, 349 const u_char *buf); 350 int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, 351 const u_char *buf); 352 353 int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops); 354 355 static inline int mtd_write_oob(struct mtd_info *mtd, loff_t to, 356 struct mtd_oob_ops *ops) 357 { 358 ops->retlen = ops->oobretlen = 0; 359 if (!mtd->_write_oob) 360 return -EOPNOTSUPP; 361 if (!(mtd->flags & MTD_WRITEABLE)) 362 return -EROFS; 363 return mtd->_write_oob(mtd, to, ops); 364 } 365 366 int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, 367 struct otp_info *buf); 368 int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, 369 size_t *retlen, u_char *buf); 370 int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, 371 struct otp_info *buf); 372 int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, 373 size_t *retlen, u_char *buf); 374 int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len, 375 size_t *retlen, u_char *buf); 376 int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len); 377 378 #ifndef __UBOOT__ 379 int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, 380 unsigned long count, loff_t to, size_t *retlen); 381 #endif 382 383 static inline void mtd_sync(struct mtd_info *mtd) 384 { 385 if (mtd->_sync) 386 mtd->_sync(mtd); 387 } 388 389 int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len); 390 int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len); 391 int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len); 392 int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs); 393 int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs); 394 int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs); 395 396 #ifndef __UBOOT__ 397 static inline int mtd_suspend(struct mtd_info *mtd) 398 { 399 return mtd->_suspend ? mtd->_suspend(mtd) : 0; 400 } 401 402 static inline void mtd_resume(struct mtd_info *mtd) 403 { 404 if (mtd->_resume) 405 mtd->_resume(mtd); 406 } 407 #endif 408 409 static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd) 410 { 411 if (mtd->erasesize_shift) 412 return sz >> mtd->erasesize_shift; 413 do_div(sz, mtd->erasesize); 414 return sz; 415 } 416 417 static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd) 418 { 419 if (mtd->erasesize_shift) 420 return sz & mtd->erasesize_mask; 421 return do_div(sz, mtd->erasesize); 422 } 423 424 static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd) 425 { 426 if (mtd->writesize_shift) 427 return sz >> mtd->writesize_shift; 428 do_div(sz, mtd->writesize); 429 return sz; 430 } 431 432 static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd) 433 { 434 if (mtd->writesize_shift) 435 return sz & mtd->writesize_mask; 436 return do_div(sz, mtd->writesize); 437 } 438 439 static inline int mtd_has_oob(const struct mtd_info *mtd) 440 { 441 return mtd->_read_oob && mtd->_write_oob; 442 } 443 444 static inline int mtd_type_is_nand(const struct mtd_info *mtd) 445 { 446 return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH; 447 } 448 449 static inline int mtd_can_have_bb(const struct mtd_info *mtd) 450 { 451 return !!mtd->_block_isbad; 452 } 453 454 /* Kernel-side ioctl definitions */ 455 456 struct mtd_partition; 457 struct mtd_part_parser_data; 458 459 extern int mtd_device_parse_register(struct mtd_info *mtd, 460 const char * const *part_probe_types, 461 struct mtd_part_parser_data *parser_data, 462 const struct mtd_partition *defparts, 463 int defnr_parts); 464 #define mtd_device_register(master, parts, nr_parts) \ 465 mtd_device_parse_register(master, NULL, NULL, parts, nr_parts) 466 extern int mtd_device_unregister(struct mtd_info *master); 467 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num); 468 extern int __get_mtd_device(struct mtd_info *mtd); 469 extern void __put_mtd_device(struct mtd_info *mtd); 470 extern struct mtd_info *get_mtd_device_nm(const char *name); 471 extern void put_mtd_device(struct mtd_info *mtd); 472 473 474 #ifndef __UBOOT__ 475 struct mtd_notifier { 476 void (*add)(struct mtd_info *mtd); 477 void (*remove)(struct mtd_info *mtd); 478 struct list_head list; 479 }; 480 481 482 extern void register_mtd_user (struct mtd_notifier *new); 483 extern int unregister_mtd_user (struct mtd_notifier *old); 484 #endif 485 void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size); 486 487 #ifdef CONFIG_MTD_PARTITIONS 488 void mtd_erase_callback(struct erase_info *instr); 489 #else 490 static inline void mtd_erase_callback(struct erase_info *instr) 491 { 492 if (instr->callback) 493 instr->callback(instr); 494 } 495 #endif 496 497 static inline int mtd_is_bitflip(int err) { 498 return err == -EUCLEAN; 499 } 500 501 static inline int mtd_is_eccerr(int err) { 502 return err == -EBADMSG; 503 } 504 505 static inline int mtd_is_bitflip_or_eccerr(int err) { 506 return mtd_is_bitflip(err) || mtd_is_eccerr(err); 507 } 508 509 unsigned mtd_mmap_capabilities(struct mtd_info *mtd); 510 511 #ifdef __UBOOT__ 512 /* drivers/mtd/mtdcore.h */ 513 int add_mtd_device(struct mtd_info *mtd); 514 int del_mtd_device(struct mtd_info *mtd); 515 int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int); 516 int del_mtd_partitions(struct mtd_info *); 517 518 int mtd_arg_off(const char *arg, int *idx, loff_t *off, loff_t *size, 519 loff_t *maxsize, int devtype, uint64_t chipsize); 520 int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off, 521 loff_t *size, loff_t *maxsize, int devtype, 522 uint64_t chipsize); 523 524 /* drivers/mtd/mtdcore.c */ 525 void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset, 526 const uint64_t length, uint64_t *len_incl_bad, 527 int *truncated); 528 #endif 529 #endif /* __MTD_MTD_H__ */ 530