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Thomas Gleixner61ecfa82005-11-07 11:15:31 +00001/*
David Woodhousea1452a32010-08-08 20:58:20 +01002 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
David Woodhousea1452a32010-08-08 20:58:20 +01004 * 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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
20#ifndef __MTD_MTD_H__
21#define __MTD_MTD_H__
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/types.h>
24#include <linux/module.h>
25#include <linux/uio.h>
Nicolas Pitre963a6fb2005-04-01 02:59:56 +010026#include <linux/notifier.h>
David Brownell1f24b5a2009-03-26 00:42:41 -070027#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <mtd/mtd-abi.h>
30
Adrian Hunter69423d92008-12-10 13:37:21 +000031#include <asm/div64.h>
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#define MTD_CHAR_MAJOR 90
34#define MTD_BLOCK_MAJOR 31
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#define MTD_ERASE_PENDING 0x01
37#define MTD_ERASING 0x02
38#define MTD_ERASE_SUSPEND 0x04
39#define MTD_ERASE_DONE 0x08
40#define MTD_ERASE_FAILED 0x10
41
Adrian Hunter69423d92008-12-10 13:37:21 +000042#define MTD_FAIL_ADDR_UNKNOWN -1LL
Adrian Hunterbb0eb212008-08-12 12:40:50 +030043
Linus Torvalds1da177e2005-04-16 15:20:36 -070044/* If the erase fails, fail_addr might indicate exactly which block failed. If
Adrian Hunterbb0eb212008-08-12 12:40:50 +030045 fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level or was not
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 specific to any particular block. */
47struct erase_info {
48 struct mtd_info *mtd;
Adrian Hunter69423d92008-12-10 13:37:21 +000049 uint64_t addr;
50 uint64_t len;
51 uint64_t fail_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 u_long time;
53 u_long retries;
David Woodhouse26cdb672008-12-10 14:08:12 +000054 unsigned dev;
55 unsigned cell;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 void (*callback) (struct erase_info *self);
57 u_long priv;
58 u_char state;
59 struct erase_info *next;
60};
61
62struct mtd_erase_region_info {
Adrian Hunter69423d92008-12-10 13:37:21 +000063 uint64_t offset; /* At which this region starts, from the beginning of the MTD */
David Woodhouse26cdb672008-12-10 14:08:12 +000064 uint32_t erasesize; /* For this region */
65 uint32_t numblocks; /* Number of blocks of erasesize in this region */
Rodolfo Giometti0ecbc812007-03-26 21:45:43 -080066 unsigned long *lockmap; /* If keeping bitmap of locks */
Linus Torvalds1da177e2005-04-16 15:20:36 -070067};
68
Thomas Gleixner8593fbc2006-05-29 03:26:58 +020069/*
70 * oob operation modes
71 *
72 * MTD_OOB_PLACE: oob data are placed at the given offset
73 * MTD_OOB_AUTO: oob data are automatically placed at the free areas
74 * which are defined by the ecclayout
Maxim Levitskyb64d39d2010-02-22 20:39:37 +020075 * MTD_OOB_RAW: mode to read oob and data without doing ECC checking
Thomas Gleixner8593fbc2006-05-29 03:26:58 +020076 */
77typedef enum {
78 MTD_OOB_PLACE,
79 MTD_OOB_AUTO,
80 MTD_OOB_RAW,
81} mtd_oob_mode_t;
82
83/**
84 * struct mtd_oob_ops - oob operation operands
85 * @mode: operation mode
86 *
Vitaly Wool70145682006-11-03 18:20:38 +030087 * @len: number of data bytes to write/read
Thomas Gleixner8593fbc2006-05-29 03:26:58 +020088 *
Vitaly Wool70145682006-11-03 18:20:38 +030089 * @retlen: number of data bytes written/read
Thomas Gleixner8593fbc2006-05-29 03:26:58 +020090 *
Vitaly Wool70145682006-11-03 18:20:38 +030091 * @ooblen: number of oob bytes to write/read
92 * @oobretlen: number of oob bytes written/read
Thomas Gleixner8593fbc2006-05-29 03:26:58 +020093 * @ooboffs: offset of oob data in the oob area (only relevant when
94 * mode = MTD_OOB_PLACE)
95 * @datbuf: data buffer - if NULL only oob data are read/written
96 * @oobbuf: oob data buffer
Artem Bityutskiy73a44212007-01-31 11:43:13 +020097 *
Frederik Schwarzer025dfda2008-10-16 19:02:37 +020098 * Note, it is allowed to read more than one OOB area at one go, but not write.
Artem Bityutskiy73a44212007-01-31 11:43:13 +020099 * The interface assumes that the OOB write requests program only one page's
100 * OOB area.
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200101 */
102struct mtd_oob_ops {
103 mtd_oob_mode_t mode;
104 size_t len;
105 size_t retlen;
106 size_t ooblen;
Vitaly Wool70145682006-11-03 18:20:38 +0300107 size_t oobretlen;
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200108 uint32_t ooboffs;
109 uint8_t *datbuf;
110 uint8_t *oobbuf;
111};
112
Brian Norriscc26c3c2010-08-24 18:12:00 -0700113#define MTD_MAX_OOBFREE_ENTRIES_LARGE 32
114#define MTD_MAX_ECCPOS_ENTRIES_LARGE 448
Brian Norriscc26c3c2010-08-24 18:12:00 -0700115/*
Brian Norris0ceacf32010-09-19 23:57:12 -0700116 * Internal ECC layout control structure. For historical reasons, there is a
117 * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
118 * for export to user-space via the ECCGETLAYOUT ioctl.
119 * nand_ecclayout should be expandable in the future simply by the above macros.
Brian Norriscc26c3c2010-08-24 18:12:00 -0700120 */
121struct nand_ecclayout {
122 __u32 eccbytes;
123 __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
124 __u32 oobavail;
125 struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
126};
127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128struct mtd_info {
129 u_char type;
David Woodhouse26cdb672008-12-10 14:08:12 +0000130 uint32_t flags;
Adrian Hunter69423d92008-12-10 13:37:21 +0000131 uint64_t size; // Total size of the MTD
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
David Woodhouse151e7652006-05-14 01:51:54 +0100133 /* "Major" erase size for the device. Naïve users may take this
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 * to be the only erase size available, or may use the more detailed
135 * information below if they desire
136 */
David Woodhouse26cdb672008-12-10 14:08:12 +0000137 uint32_t erasesize;
Artem B. Bityutskiy783ed812006-06-14 19:53:44 +0400138 /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
139 * though individual bits can be cleared), in case of NAND flash it is
140 * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
141 * it is of ECC block size, etc. It is illegal to have writesize = 0.
142 * Any driver registering a struct mtd_info must ensure a writesize of
143 * 1 or larger.
Joern Engel28318772006-05-22 23:18:05 +0200144 */
David Woodhouse26cdb672008-12-10 14:08:12 +0000145 uint32_t writesize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Anatolij Gustschin0e4ca7e2010-12-16 23:42:14 +0100147 /*
148 * Size of the write buffer used by the MTD. MTD devices having a write
149 * buffer can write multiple writesize chunks at a time. E.g. while
150 * writing 4 * writesize bytes to a device with 2 * writesize bytes
151 * buffer the MTD driver can (but doesn't have to) do 2 writesize
152 * operations, but not 4. Currently, all NANDs have writebufsize
153 * equivalent to writesize (NAND page size). Some NOR flashes do have
154 * writebufsize greater than writesize.
155 */
156 uint32_t writebufsize;
157
David Woodhouse26cdb672008-12-10 14:08:12 +0000158 uint32_t oobsize; // Amount of OOB data per block (e.g. 16)
159 uint32_t oobavail; // Available OOB bytes per block
Nicolas Pitre638d9832005-08-06 05:40:46 +0100160
Adrian Hunter69423d92008-12-10 13:37:21 +0000161 /*
162 * If erasesize is a power of 2 then the shift is stored in
163 * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
164 */
165 unsigned int erasesize_shift;
166 unsigned int writesize_shift;
167 /* Masks based on erasesize_shift and writesize_shift */
168 unsigned int erasesize_mask;
169 unsigned int writesize_mask;
Nicolas Pitre638d9832005-08-06 05:40:46 +0100170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 // Kernel-only stuff starts here.
Greg Kroah-Hartmaneadcf0d2008-07-02 12:46:22 -0700172 const char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 int index;
174
Thomas Gleixner5bd34c02006-05-27 22:16:10 +0200175 /* ecc layout structure pointer - read only ! */
176 struct nand_ecclayout *ecclayout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178 /* Data for variable erase regions. If numeraseregions is zero,
Thomas Gleixner61ecfa82005-11-07 11:15:31 +0000179 * it means that the whole device has erasesize as given above.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 */
181 int numeraseregions;
Thomas Gleixner61ecfa82005-11-07 11:15:31 +0000182 struct mtd_erase_region_info *eraseregions;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Jörn Engelb38178e2007-09-21 15:41:44 +0200184 /*
185 * Erase is an asynchronous operation. Device drivers are supposed
186 * to call instr->callback() whenever the operation completes, even
187 * if it completes with a failure.
188 * Callers are supposed to pass a callback function and wait for it
189 * to be called before writing to the block.
190 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
192
193 /* This stuff for eXecute-In-Place */
Jared Hulberta98889f2008-04-29 23:26:49 -0700194 /* phys is optional and may be set to NULL */
195 int (*point) (struct mtd_info *mtd, loff_t from, size_t len,
196 size_t *retlen, void **virt, resource_size_t *phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
Jared Hulberta98889f2008-04-29 23:26:49 -0700199 void (*unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
David Howells402d3262009-02-12 10:40:00 +0000201 /* Allow NOMMU mmap() to directly map the device (if not NULL)
202 * - return the address to which the offset maps
203 * - return -ENOSYS to indicate refusal to do the mapping
204 */
205 unsigned long (*get_unmapped_area) (struct mtd_info *mtd,
206 unsigned long len,
207 unsigned long offset,
208 unsigned long flags);
209
210 /* Backing device capabilities for this device
211 * - provides mmap capabilities
212 */
213 struct backing_dev_info *backing_dev_info;
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216 int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
217 int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
218
Richard Purdie388bbb02008-02-06 10:17:15 +0000219 /* In blackbox flight recorder like scenarios we want to make successful
220 writes in interrupt context. panic_write() is only intended to be
221 called when its known the kernel is about to panic and we need the
222 write to succeed. Since the kernel is not going to be running for much
223 longer, this function can break locks and delay to ensure the write
224 succeeds (but not sleep). */
225
226 int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
227
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200228 int (*read_oob) (struct mtd_info *mtd, loff_t from,
229 struct mtd_oob_ops *ops);
230 int (*write_oob) (struct mtd_info *mtd, loff_t to,
231 struct mtd_oob_ops *ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Thomas Gleixner61ecfa82005-11-07 11:15:31 +0000233 /*
234 * Methods to access the protection register area, present in some
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 * flash devices. The user data is one time programmable but the
Thomas Gleixner61ecfa82005-11-07 11:15:31 +0000236 * factory data is read only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 */
Nicolas Pitref77814d2005-02-08 17:11:19 +0000238 int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
Nicolas Pitref77814d2005-02-08 17:11:19 +0000240 int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
241 int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
Nicolas Pitref77814d2005-02-08 17:11:19 +0000243 int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Thomas Gleixner2528e8c2006-05-23 16:10:00 +0200245 /* kvec-based read/write methods.
Thomas Gleixner61ecfa82005-11-07 11:15:31 +0000246 NB: The 'count' parameter is the number of _vectors_, each of
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 which contains an (ofs, len) tuple.
248 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251 /* Sync */
252 void (*sync) (struct mtd_info *mtd);
253
254 /* Chip-supported device locking */
Adrian Hunter69423d92008-12-10 13:37:21 +0000255 int (*lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
256 int (*unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
Richard Cochran99384242010-06-14 18:10:33 +0200257 int (*is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259 /* Power Management functions */
260 int (*suspend) (struct mtd_info *mtd);
261 void (*resume) (struct mtd_info *mtd);
262
263 /* Bad block management functions */
264 int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
265 int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
266
Nicolas Pitre963a6fb2005-04-01 02:59:56 +0100267 struct notifier_block reboot_notifier; /* default mode before reboot */
268
Thomas Gleixner7fac4642006-05-25 09:57:31 +0200269 /* ECC status information */
270 struct mtd_ecc_stats ecc_stats;
Thomas Gleixner29072b92006-09-28 15:38:36 +0200271 /* Subpage shift (NAND) */
272 int subpage_sft;
Thomas Gleixner7fac4642006-05-25 09:57:31 +0200273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 void *priv;
275
276 struct module *owner;
David Brownell1f24b5a2009-03-26 00:42:41 -0700277 struct device dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 int usecount;
Artem Bityutskiy9fe912c2006-10-11 14:52:45 +0300279
280 /* If the driver is something smart, like UBI, it may need to maintain
281 * its own reference counting. The below functions are only for driver.
282 * The driver may register its callbacks. These callbacks are not
283 * supposed to be called by MTD users */
284 int (*get_device) (struct mtd_info *mtd);
285 void (*put_device) (struct mtd_info *mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286};
287
David Brownell1f24b5a2009-03-26 00:42:41 -0700288static inline struct mtd_info *dev_to_mtd(struct device *dev)
289{
Saeed Bishara6afc4fd2009-07-28 04:56:43 -0700290 return dev ? dev_get_drvdata(dev) : NULL;
David Brownell1f24b5a2009-03-26 00:42:41 -0700291}
292
David Woodhouse26cdb672008-12-10 14:08:12 +0000293static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
Adrian Hunter69423d92008-12-10 13:37:21 +0000294{
295 if (mtd->erasesize_shift)
296 return sz >> mtd->erasesize_shift;
297 do_div(sz, mtd->erasesize);
298 return sz;
299}
300
David Woodhouse26cdb672008-12-10 14:08:12 +0000301static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
Adrian Hunter69423d92008-12-10 13:37:21 +0000302{
303 if (mtd->erasesize_shift)
304 return sz & mtd->erasesize_mask;
305 return do_div(sz, mtd->erasesize);
306}
307
David Woodhouse26cdb672008-12-10 14:08:12 +0000308static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
Adrian Hunter69423d92008-12-10 13:37:21 +0000309{
310 if (mtd->writesize_shift)
311 return sz >> mtd->writesize_shift;
312 do_div(sz, mtd->writesize);
313 return sz;
314}
315
David Woodhouse26cdb672008-12-10 14:08:12 +0000316static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
Adrian Hunter69423d92008-12-10 13:37:21 +0000317{
318 if (mtd->writesize_shift)
319 return sz & mtd->writesize_mask;
320 return do_div(sz, mtd->writesize);
321}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323 /* Kernel-side ioctl definitions */
324
325extern int add_mtd_device(struct mtd_info *mtd);
326extern int del_mtd_device (struct mtd_info *mtd);
327
328extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
Maxim Levitsky3bd45652010-02-22 20:39:28 +0200329extern int __get_mtd_device(struct mtd_info *mtd);
330extern void __put_mtd_device(struct mtd_info *mtd);
Artem Bityutskiy77993082006-10-11 14:52:44 +0300331extern struct mtd_info *get_mtd_device_nm(const char *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332extern void put_mtd_device(struct mtd_info *mtd);
333
334
335struct mtd_notifier {
336 void (*add)(struct mtd_info *mtd);
337 void (*remove)(struct mtd_info *mtd);
338 struct list_head list;
339};
340
341
342extern void register_mtd_user (struct mtd_notifier *new);
343extern int unregister_mtd_user (struct mtd_notifier *old);
344
345int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
346 unsigned long count, loff_t to, size_t *retlen);
347
348int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
349 unsigned long count, loff_t from, size_t *retlen);
350
Grant Erickson33b53712011-04-08 08:51:32 -0700351void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353#ifdef CONFIG_MTD_PARTITIONS
354void mtd_erase_callback(struct erase_info *instr);
355#else
356static inline void mtd_erase_callback(struct erase_info *instr)
357{
358 if (instr->callback)
359 instr->callback(instr);
360}
361#endif
362
363/*
364 * Debugging macro and defines
365 */
366#define MTD_DEBUG_LEVEL0 (0) /* Quiet */
367#define MTD_DEBUG_LEVEL1 (1) /* Audible */
368#define MTD_DEBUG_LEVEL2 (2) /* Loud */
369#define MTD_DEBUG_LEVEL3 (3) /* Noisy */
370
371#ifdef CONFIG_MTD_DEBUG
372#define DEBUG(n, args...) \
Thomas Gleixnerf4a43cf2006-05-28 11:01:53 +0200373 do { \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 if (n <= CONFIG_MTD_DEBUG_VERBOSE) \
375 printk(KERN_INFO args); \
376 } while(0)
377#else /* CONFIG_MTD_DEBUG */
David Brownell95b1bc22008-07-29 22:28:12 -0700378#define DEBUG(n, args...) \
379 do { \
380 if (0) \
381 printk(KERN_INFO args); \
382 } while(0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
384#endif /* CONFIG_MTD_DEBUG */
385
386#endif /* __MTD_MTD_H__ */