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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  * Note, it is allowed to read more than one OOB area at one go, but not write.
80  * The interface assumes that the OOB write requests program only one page's
81  * OOB area.
82  */
83 struct mtd_oob_ops {
84 	unsigned int	mode;
85 	size_t		len;
86 	size_t		retlen;
87 	size_t		ooblen;
88 	size_t		oobretlen;
89 	uint32_t	ooboffs;
90 	uint8_t		*datbuf;
91 	uint8_t		*oobbuf;
92 };
93 
94 #ifdef CONFIG_SYS_NAND_MAX_OOBFREE
95 #define MTD_MAX_OOBFREE_ENTRIES_LARGE	CONFIG_SYS_NAND_MAX_OOBFREE
96 #else
97 #define MTD_MAX_OOBFREE_ENTRIES_LARGE	32
98 #endif
99 
100 #ifdef CONFIG_SYS_NAND_MAX_ECCPOS
101 #define MTD_MAX_ECCPOS_ENTRIES_LARGE	CONFIG_SYS_NAND_MAX_ECCPOS
102 #else
103 #define MTD_MAX_ECCPOS_ENTRIES_LARGE	680
104 #endif
105 /**
106  * struct mtd_oob_region - oob region definition
107  * @offset: region offset
108  * @length: region length
109  *
110  * This structure describes a region of the OOB area, and is used
111  * to retrieve ECC or free bytes sections.
112  * Each section is defined by an offset within the OOB area and a
113  * length.
114  */
115 struct mtd_oob_region {
116 	u32 offset;
117 	u32 length;
118 };
119 
120 /*
121  * struct mtd_ooblayout_ops - NAND OOB layout operations
122  * @ecc: function returning an ECC region in the OOB area.
123  *	 Should return -ERANGE if %section exceeds the total number of
124  *	 ECC sections.
125  * @free: function returning a free region in the OOB area.
126  *	  Should return -ERANGE if %section exceeds the total number of
127  *	  free sections.
128  */
129 struct mtd_ooblayout_ops {
130 	int (*ecc)(struct mtd_info *mtd, int section,
131 		   struct mtd_oob_region *oobecc);
132 	int (*free)(struct mtd_info *mtd, int section,
133 		    struct mtd_oob_region *oobfree);
134 };
135 
136 /*
137  * Internal ECC layout control structure. For historical reasons, there is a
138  * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
139  * for export to user-space via the ECCGETLAYOUT ioctl.
140  * nand_ecclayout should be expandable in the future simply by the above macros.
141  */
142 struct nand_ecclayout {
143 	__u32 eccbytes;
144 	__u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
145 	__u32 oobavail;
146 	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
147 };
148 
149 struct module;	/* only needed for owner field in mtd_info */
150 
151 struct mtd_info {
152 	u_char type;
153 	uint32_t flags;
154 	uint64_t size;	 // Total size of the MTD
155 
156 	/* "Major" erase size for the device. Naïve users may take this
157 	 * to be the only erase size available, or may use the more detailed
158 	 * information below if they desire
159 	 */
160 	uint32_t erasesize;
161 	/* Minimal writable flash unit size. In case of NOR flash it is 1 (even
162 	 * though individual bits can be cleared), in case of NAND flash it is
163 	 * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
164 	 * it is of ECC block size, etc. It is illegal to have writesize = 0.
165 	 * Any driver registering a struct mtd_info must ensure a writesize of
166 	 * 1 or larger.
167 	 */
168 	uint32_t writesize;
169 
170 	/*
171 	 * Size of the write buffer used by the MTD. MTD devices having a write
172 	 * buffer can write multiple writesize chunks at a time. E.g. while
173 	 * writing 4 * writesize bytes to a device with 2 * writesize bytes
174 	 * buffer the MTD driver can (but doesn't have to) do 2 writesize
175 	 * operations, but not 4. Currently, all NANDs have writebufsize
176 	 * equivalent to writesize (NAND page size). Some NOR flashes do have
177 	 * writebufsize greater than writesize.
178 	 */
179 	uint32_t writebufsize;
180 
181 	uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
182 	uint32_t oobavail;  // Available OOB bytes per block
183 
184 	/*
185 	 * If erasesize is a power of 2 then the shift is stored in
186 	 * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
187 	 */
188 	unsigned int erasesize_shift;
189 	unsigned int writesize_shift;
190 	/* Masks based on erasesize_shift and writesize_shift */
191 	unsigned int erasesize_mask;
192 	unsigned int writesize_mask;
193 
194 	/*
195 	 * read ops return -EUCLEAN if max number of bitflips corrected on any
196 	 * one region comprising an ecc step equals or exceeds this value.
197 	 * Settable by driver, else defaults to ecc_strength.  User can override
198 	 * in sysfs.  N.B. The meaning of the -EUCLEAN return code has changed;
199 	 * see Documentation/ABI/testing/sysfs-class-mtd for more detail.
200 	 */
201 	unsigned int bitflip_threshold;
202 
203 	// Kernel-only stuff starts here.
204 #ifndef __UBOOT__
205 	const char *name;
206 #else
207 	char *name;
208 #endif
209 	int index;
210 
211 	/* OOB layout description */
212 	const struct mtd_ooblayout_ops *ooblayout;
213 
214 	/* ECC layout structure pointer - read only! */
215 	struct nand_ecclayout *ecclayout;
216 
217 	/* the ecc step size. */
218 	unsigned int ecc_step_size;
219 
220 	/* max number of correctible bit errors per ecc step */
221 	unsigned int ecc_strength;
222 
223 	/* Data for variable erase regions. If numeraseregions is zero,
224 	 * it means that the whole device has erasesize as given above.
225 	 */
226 	int numeraseregions;
227 	struct mtd_erase_region_info *eraseregions;
228 
229 	/*
230 	 * Do not call via these pointers, use corresponding mtd_*()
231 	 * wrappers instead.
232 	 */
233 	int (*_erase) (struct mtd_info *mtd, struct erase_info *instr);
234 #ifndef __UBOOT__
235 	int (*_point) (struct mtd_info *mtd, loff_t from, size_t len,
236 		       size_t *retlen, void **virt, resource_size_t *phys);
237 	int (*_unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
238 #endif
239 	unsigned long (*_get_unmapped_area) (struct mtd_info *mtd,
240 					     unsigned long len,
241 					     unsigned long offset,
242 					     unsigned long flags);
243 	int (*_read) (struct mtd_info *mtd, loff_t from, size_t len,
244 		      size_t *retlen, u_char *buf);
245 	int (*_write) (struct mtd_info *mtd, loff_t to, size_t len,
246 		       size_t *retlen, const u_char *buf);
247 	int (*_panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
248 			     size_t *retlen, const u_char *buf);
249 	int (*_read_oob) (struct mtd_info *mtd, loff_t from,
250 			  struct mtd_oob_ops *ops);
251 	int (*_write_oob) (struct mtd_info *mtd, loff_t to,
252 			   struct mtd_oob_ops *ops);
253 	int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len,
254 				    size_t *retlen, struct otp_info *buf);
255 	int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
256 				    size_t len, size_t *retlen, u_char *buf);
257 	int (*_get_user_prot_info) (struct mtd_info *mtd, size_t len,
258 				    size_t *retlen, struct otp_info *buf);
259 	int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
260 				    size_t len, size_t *retlen, u_char *buf);
261 	int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to,
262 				     size_t len, size_t *retlen, u_char *buf);
263 	int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from,
264 				    size_t len);
265 #ifndef __UBOOT__
266 	int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs,
267 			unsigned long count, loff_t to, size_t *retlen);
268 #endif
269 	void (*_sync) (struct mtd_info *mtd);
270 	int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
271 	int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
272 	int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
273 	int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs);
274 	int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs);
275 	int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
276 #ifndef __UBOOT__
277 	int (*_suspend) (struct mtd_info *mtd);
278 	void (*_resume) (struct mtd_info *mtd);
279 	void (*_reboot) (struct mtd_info *mtd);
280 #endif
281 	/*
282 	 * If the driver is something smart, like UBI, it may need to maintain
283 	 * its own reference counting. The below functions are only for driver.
284 	 */
285 	int (*_get_device) (struct mtd_info *mtd);
286 	void (*_put_device) (struct mtd_info *mtd);
287 
288 #ifndef __UBOOT__
289 	/* Backing device capabilities for this device
290 	 * - provides mmap capabilities
291 	 */
292 	struct backing_dev_info *backing_dev_info;
293 
294 	struct notifier_block reboot_notifier;  /* default mode before reboot */
295 #endif
296 
297 	/* ECC status information */
298 	struct mtd_ecc_stats ecc_stats;
299 	/* Subpage shift (NAND) */
300 	int subpage_sft;
301 
302 	void *priv;
303 
304 	struct module *owner;
305 #ifndef __UBOOT__
306 	struct device dev;
307 #else
308 	struct udevice *dev;
309 #endif
310 	int usecount;
311 };
312 
313 int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
314 		      struct mtd_oob_region *oobecc);
315 int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
316 				 int *section,
317 				 struct mtd_oob_region *oobregion);
318 int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
319 			       const u8 *oobbuf, int start, int nbytes);
320 int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
321 			       u8 *oobbuf, int start, int nbytes);
322 int mtd_ooblayout_free(struct mtd_info *mtd, int section,
323 		       struct mtd_oob_region *oobfree);
324 int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
325 				const u8 *oobbuf, int start, int nbytes);
326 int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
327 				u8 *oobbuf, int start, int nbytes);
328 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
329 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
330 
mtd_set_ooblayout(struct mtd_info * mtd,const struct mtd_ooblayout_ops * ooblayout)331 static inline void mtd_set_ooblayout(struct mtd_info *mtd,
332 				     const struct mtd_ooblayout_ops *ooblayout)
333 {
334 	mtd->ooblayout = ooblayout;
335 }
336 
mtd_oobavail(struct mtd_info * mtd,struct mtd_oob_ops * ops)337 static inline int mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops)
338 {
339 	return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
340 }
341 
342 int mtd_erase(struct mtd_info *mtd, struct erase_info *instr);
343 #ifndef __UBOOT__
344 int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
345 	      void **virt, resource_size_t *phys);
346 int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
347 #endif
348 unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
349 				    unsigned long offset, unsigned long flags);
350 int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
351 	     u_char *buf);
352 int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
353 	      const u_char *buf);
354 int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
355 		    const u_char *buf);
356 
357 int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops);
358 
mtd_write_oob(struct mtd_info * mtd,loff_t to,struct mtd_oob_ops * ops)359 static inline int mtd_write_oob(struct mtd_info *mtd, loff_t to,
360 				struct mtd_oob_ops *ops)
361 {
362 	ops->retlen = ops->oobretlen = 0;
363 	if (!mtd->_write_oob)
364 		return -EOPNOTSUPP;
365 	if (!(mtd->flags & MTD_WRITEABLE))
366 		return -EROFS;
367 	return mtd->_write_oob(mtd, to, ops);
368 }
369 
370 int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
371 			   struct otp_info *buf);
372 int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
373 			   size_t *retlen, u_char *buf);
374 int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
375 			   struct otp_info *buf);
376 int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
377 			   size_t *retlen, u_char *buf);
378 int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
379 			    size_t *retlen, u_char *buf);
380 int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);
381 
382 #ifndef __UBOOT__
383 int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
384 	       unsigned long count, loff_t to, size_t *retlen);
385 #endif
386 
mtd_sync(struct mtd_info * mtd)387 static inline void mtd_sync(struct mtd_info *mtd)
388 {
389 	if (mtd->_sync)
390 		mtd->_sync(mtd);
391 }
392 
393 int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
394 int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
395 int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
396 int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs);
397 int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
398 int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
399 
400 #ifndef __UBOOT__
mtd_suspend(struct mtd_info * mtd)401 static inline int mtd_suspend(struct mtd_info *mtd)
402 {
403 	return mtd->_suspend ? mtd->_suspend(mtd) : 0;
404 }
405 
mtd_resume(struct mtd_info * mtd)406 static inline void mtd_resume(struct mtd_info *mtd)
407 {
408 	if (mtd->_resume)
409 		mtd->_resume(mtd);
410 }
411 #endif
412 
mtd_div_by_eb(uint64_t sz,struct mtd_info * mtd)413 static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
414 {
415 	if (mtd->erasesize_shift)
416 		return sz >> mtd->erasesize_shift;
417 	do_div(sz, mtd->erasesize);
418 	return sz;
419 }
420 
mtd_mod_by_eb(uint64_t sz,struct mtd_info * mtd)421 static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
422 {
423 	if (mtd->erasesize_shift)
424 		return sz & mtd->erasesize_mask;
425 	return do_div(sz, mtd->erasesize);
426 }
427 
mtd_div_by_ws(uint64_t sz,struct mtd_info * mtd)428 static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
429 {
430 	if (mtd->writesize_shift)
431 		return sz >> mtd->writesize_shift;
432 	do_div(sz, mtd->writesize);
433 	return sz;
434 }
435 
mtd_mod_by_ws(uint64_t sz,struct mtd_info * mtd)436 static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
437 {
438 	if (mtd->writesize_shift)
439 		return sz & mtd->writesize_mask;
440 	return do_div(sz, mtd->writesize);
441 }
442 
mtd_has_oob(const struct mtd_info * mtd)443 static inline int mtd_has_oob(const struct mtd_info *mtd)
444 {
445 	return mtd->_read_oob && mtd->_write_oob;
446 }
447 
mtd_type_is_nand(const struct mtd_info * mtd)448 static inline int mtd_type_is_nand(const struct mtd_info *mtd)
449 {
450 	return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
451 }
452 
mtd_can_have_bb(const struct mtd_info * mtd)453 static inline int mtd_can_have_bb(const struct mtd_info *mtd)
454 {
455 	return !!mtd->_block_isbad;
456 }
457 
458 	/* Kernel-side ioctl definitions */
459 
460 struct mtd_partition;
461 struct mtd_part_parser_data;
462 
463 extern int mtd_device_parse_register(struct mtd_info *mtd,
464 				     const char * const *part_probe_types,
465 				     struct mtd_part_parser_data *parser_data,
466 				     const struct mtd_partition *defparts,
467 				     int defnr_parts);
468 #define mtd_device_register(master, parts, nr_parts)	\
469 	mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
470 extern int mtd_device_unregister(struct mtd_info *master);
471 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
472 extern int __get_mtd_device(struct mtd_info *mtd);
473 extern void __put_mtd_device(struct mtd_info *mtd);
474 extern struct mtd_info *get_mtd_device_nm(const char *name);
475 extern void put_mtd_device(struct mtd_info *mtd);
476 
477 
478 #ifndef __UBOOT__
479 struct mtd_notifier {
480 	void (*add)(struct mtd_info *mtd);
481 	void (*remove)(struct mtd_info *mtd);
482 	struct list_head list;
483 };
484 
485 
486 extern void register_mtd_user (struct mtd_notifier *new);
487 extern int unregister_mtd_user (struct mtd_notifier *old);
488 #endif
489 void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
490 
491 #ifdef CONFIG_MTD_PARTITIONS
492 void mtd_erase_callback(struct erase_info *instr);
493 #else
mtd_erase_callback(struct erase_info * instr)494 static inline void mtd_erase_callback(struct erase_info *instr)
495 {
496 	if (instr->callback)
497 		instr->callback(instr);
498 }
499 #endif
500 
mtd_is_bitflip(int err)501 static inline int mtd_is_bitflip(int err) {
502 	return err == -EUCLEAN;
503 }
504 
mtd_is_eccerr(int err)505 static inline int mtd_is_eccerr(int err) {
506 	return err == -EBADMSG;
507 }
508 
mtd_is_bitflip_or_eccerr(int err)509 static inline int mtd_is_bitflip_or_eccerr(int err) {
510 	return mtd_is_bitflip(err) || mtd_is_eccerr(err);
511 }
512 
513 unsigned mtd_mmap_capabilities(struct mtd_info *mtd);
514 
515 #ifdef __UBOOT__
516 /* drivers/mtd/mtdcore.h */
517 int add_mtd_device(struct mtd_info *mtd);
518 int del_mtd_device(struct mtd_info *mtd);
519 int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
520 int del_mtd_partitions(struct mtd_info *);
521 
522 int mtd_arg_off(const char *arg, int *idx, loff_t *off, loff_t *size,
523 		loff_t *maxsize, int devtype, uint64_t chipsize);
524 int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off,
525 		     loff_t *size, loff_t *maxsize, int devtype,
526 		     uint64_t chipsize);
527 
528 /* drivers/mtd/mtdcore.c */
529 void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset,
530 			  const uint64_t length, uint64_t *len_incl_bad,
531 			  int *truncated);
532 #endif
533 #endif /* __MTD_MTD_H__ */
534