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Linux/include/linux/mtd/mtd.h

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  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    640
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         /*
161          * read ops return -EUCLEAN if max number of bitflips corrected on any
162          * one region comprising an ecc step equals or exceeds this value.
163          * Settable by driver, else defaults to ecc_strength.  User can override
164          * in sysfs.  N.B. The meaning of the -EUCLEAN return code has changed;
165          * see Documentation/ABI/testing/sysfs-class-mtd for more detail.
166          */
167         unsigned int bitflip_threshold;
168 
169         // Kernel-only stuff starts here.
170         const char *name;
171         int index;
172 
173         /* ECC layout structure pointer - read only! */
174         struct nand_ecclayout *ecclayout;
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, struct otp_info *buf,
208                                     size_t len);
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, struct otp_info *buf,
212                                     size_t len);
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_isbad) (struct mtd_info *mtd, loff_t ofs);
226         int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
227         int (*_suspend) (struct mtd_info *mtd);
228         void (*_resume) (struct mtd_info *mtd);
229         /*
230          * If the driver is something smart, like UBI, it may need to maintain
231          * its own reference counting. The below functions are only for driver.
232          */
233         int (*_get_device) (struct mtd_info *mtd);
234         void (*_put_device) (struct mtd_info *mtd);
235 
236         /* Backing device capabilities for this device
237          * - provides mmap capabilities
238          */
239         struct backing_dev_info *backing_dev_info;
240 
241         struct notifier_block reboot_notifier;  /* default mode before reboot */
242 
243         /* ECC status information */
244         struct mtd_ecc_stats ecc_stats;
245         /* Subpage shift (NAND) */
246         int subpage_sft;
247 
248         void *priv;
249 
250         struct module *owner;
251         struct device dev;
252         int usecount;
253 };
254 
255 int mtd_erase(struct mtd_info *mtd, struct erase_info *instr);
256 int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
257               void **virt, resource_size_t *phys);
258 int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
259 unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
260                                     unsigned long offset, unsigned long flags);
261 int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
262              u_char *buf);
263 int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
264               const u_char *buf);
265 int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
266                     const u_char *buf);
267 
268 int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops);
269 
270 static inline int mtd_write_oob(struct mtd_info *mtd, loff_t to,
271                                 struct mtd_oob_ops *ops)
272 {
273         ops->retlen = ops->oobretlen = 0;
274         if (!mtd->_write_oob)
275                 return -EOPNOTSUPP;
276         if (!(mtd->flags & MTD_WRITEABLE))
277                 return -EROFS;
278         return mtd->_write_oob(mtd, to, ops);
279 }
280 
281 int mtd_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf,
282                            size_t len);
283 int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
284                            size_t *retlen, u_char *buf);
285 int mtd_get_user_prot_info(struct mtd_info *mtd, struct otp_info *buf,
286                            size_t len);
287 int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
288                            size_t *retlen, u_char *buf);
289 int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
290                             size_t *retlen, u_char *buf);
291 int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);
292 
293 int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
294                unsigned long count, loff_t to, size_t *retlen);
295 
296 static inline void mtd_sync(struct mtd_info *mtd)
297 {
298         if (mtd->_sync)
299                 mtd->_sync(mtd);
300 }
301 
302 int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
303 int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
304 int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
305 int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
306 int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
307 
308 static inline int mtd_suspend(struct mtd_info *mtd)
309 {
310         return mtd->_suspend ? mtd->_suspend(mtd) : 0;
311 }
312 
313 static inline void mtd_resume(struct mtd_info *mtd)
314 {
315         if (mtd->_resume)
316                 mtd->_resume(mtd);
317 }
318 
319 static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
320 {
321         if (mtd->erasesize_shift)
322                 return sz >> mtd->erasesize_shift;
323         do_div(sz, mtd->erasesize);
324         return sz;
325 }
326 
327 static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
328 {
329         if (mtd->erasesize_shift)
330                 return sz & mtd->erasesize_mask;
331         return do_div(sz, mtd->erasesize);
332 }
333 
334 static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
335 {
336         if (mtd->writesize_shift)
337                 return sz >> mtd->writesize_shift;
338         do_div(sz, mtd->writesize);
339         return sz;
340 }
341 
342 static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
343 {
344         if (mtd->writesize_shift)
345                 return sz & mtd->writesize_mask;
346         return do_div(sz, mtd->writesize);
347 }
348 
349 static inline int mtd_has_oob(const struct mtd_info *mtd)
350 {
351         return mtd->_read_oob && mtd->_write_oob;
352 }
353 
354 static inline int mtd_can_have_bb(const struct mtd_info *mtd)
355 {
356         return !!mtd->_block_isbad;
357 }
358 
359         /* Kernel-side ioctl definitions */
360 
361 struct mtd_partition;
362 struct mtd_part_parser_data;
363 
364 extern int mtd_device_parse_register(struct mtd_info *mtd,
365                                      const char * const *part_probe_types,
366                                      struct mtd_part_parser_data *parser_data,
367                                      const struct mtd_partition *defparts,
368                                      int defnr_parts);
369 #define mtd_device_register(master, parts, nr_parts)    \
370         mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
371 extern int mtd_device_unregister(struct mtd_info *master);
372 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
373 extern int __get_mtd_device(struct mtd_info *mtd);
374 extern void __put_mtd_device(struct mtd_info *mtd);
375 extern struct mtd_info *get_mtd_device_nm(const char *name);
376 extern void put_mtd_device(struct mtd_info *mtd);
377 
378 
379 struct mtd_notifier {
380         void (*add)(struct mtd_info *mtd);
381         void (*remove)(struct mtd_info *mtd);
382         struct list_head list;
383 };
384 
385 
386 extern void register_mtd_user (struct mtd_notifier *new);
387 extern int unregister_mtd_user (struct mtd_notifier *old);
388 void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
389 
390 void mtd_erase_callback(struct erase_info *instr);
391 
392 static inline int mtd_is_bitflip(int err) {
393         return err == -EUCLEAN;
394 }
395 
396 static inline int mtd_is_eccerr(int err) {
397         return err == -EBADMSG;
398 }
399 
400 static inline int mtd_is_bitflip_or_eccerr(int err) {
401         return mtd_is_bitflip(err) || mtd_is_eccerr(err);
402 }
403 
404 #endif /* __MTD_MTD_H__ */
405 

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