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