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61ecfa87 TG |
1 | /* |
2 | * $Id: mtd.h,v 1.61 2005/11/07 11:14:54 gleixner Exp $ | |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> et al. | |
5 | * | |
6 | * Released under GPL | |
7 | */ | |
8 | ||
9 | #ifndef __MTD_MTD_H__ | |
10 | #define __MTD_MTD_H__ | |
11 | ||
1da177e4 LT |
12 | #include <linux/types.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/uio.h> | |
963a6fb0 | 15 | #include <linux/notifier.h> |
1da177e4 LT |
16 | |
17 | #include <linux/mtd/compatmac.h> | |
18 | #include <mtd/mtd-abi.h> | |
19 | ||
20 | #define MTD_CHAR_MAJOR 90 | |
21 | #define MTD_BLOCK_MAJOR 31 | |
c0fe10ae | 22 | #define MAX_MTD_DEVICES 32 |
1da177e4 LT |
23 | |
24 | #define MTD_ERASE_PENDING 0x01 | |
25 | #define MTD_ERASING 0x02 | |
26 | #define MTD_ERASE_SUSPEND 0x04 | |
27 | #define MTD_ERASE_DONE 0x08 | |
28 | #define MTD_ERASE_FAILED 0x10 | |
29 | ||
30 | /* If the erase fails, fail_addr might indicate exactly which block failed. If | |
31 | fail_addr = 0xffffffff, the failure was not at the device level or was not | |
32 | specific to any particular block. */ | |
33 | struct erase_info { | |
34 | struct mtd_info *mtd; | |
35 | u_int32_t addr; | |
36 | u_int32_t len; | |
37 | u_int32_t fail_addr; | |
38 | u_long time; | |
39 | u_long retries; | |
40 | u_int dev; | |
41 | u_int cell; | |
42 | void (*callback) (struct erase_info *self); | |
43 | u_long priv; | |
44 | u_char state; | |
45 | struct erase_info *next; | |
46 | }; | |
47 | ||
48 | struct mtd_erase_region_info { | |
49 | u_int32_t offset; /* At which this region starts, from the beginning of the MTD */ | |
50 | u_int32_t erasesize; /* For this region */ | |
51 | u_int32_t numblocks; /* Number of blocks of erasesize in this region */ | |
0ecbc81a | 52 | unsigned long *lockmap; /* If keeping bitmap of locks */ |
1da177e4 LT |
53 | }; |
54 | ||
8593fbc6 TG |
55 | /* |
56 | * oob operation modes | |
57 | * | |
58 | * MTD_OOB_PLACE: oob data are placed at the given offset | |
59 | * MTD_OOB_AUTO: oob data are automatically placed at the free areas | |
60 | * which are defined by the ecclayout | |
61 | * MTD_OOB_RAW: mode to read raw data+oob in one chunk. The oob data | |
62 | * is inserted into the data. Thats a raw image of the | |
63 | * flash contents. | |
64 | */ | |
65 | typedef enum { | |
66 | MTD_OOB_PLACE, | |
67 | MTD_OOB_AUTO, | |
68 | MTD_OOB_RAW, | |
69 | } mtd_oob_mode_t; | |
70 | ||
71 | /** | |
72 | * struct mtd_oob_ops - oob operation operands | |
73 | * @mode: operation mode | |
74 | * | |
7014568b | 75 | * @len: number of data bytes to write/read |
8593fbc6 | 76 | * |
7014568b | 77 | * @retlen: number of data bytes written/read |
8593fbc6 | 78 | * |
7014568b VW |
79 | * @ooblen: number of oob bytes to write/read |
80 | * @oobretlen: number of oob bytes written/read | |
8593fbc6 TG |
81 | * @ooboffs: offset of oob data in the oob area (only relevant when |
82 | * mode = MTD_OOB_PLACE) | |
83 | * @datbuf: data buffer - if NULL only oob data are read/written | |
84 | * @oobbuf: oob data buffer | |
73a4421c AB |
85 | * |
86 | * Note, it is allowed to read more then one OOB area at one go, but not write. | |
87 | * The interface assumes that the OOB write requests program only one page's | |
88 | * OOB area. | |
8593fbc6 TG |
89 | */ |
90 | struct mtd_oob_ops { | |
91 | mtd_oob_mode_t mode; | |
92 | size_t len; | |
93 | size_t retlen; | |
94 | size_t ooblen; | |
7014568b | 95 | size_t oobretlen; |
8593fbc6 TG |
96 | uint32_t ooboffs; |
97 | uint8_t *datbuf; | |
98 | uint8_t *oobbuf; | |
99 | }; | |
100 | ||
1da177e4 LT |
101 | struct mtd_info { |
102 | u_char type; | |
103 | u_int32_t flags; | |
104 | u_int32_t size; // Total size of the MTD | |
105 | ||
151e7659 | 106 | /* "Major" erase size for the device. Naïve users may take this |
1da177e4 LT |
107 | * to be the only erase size available, or may use the more detailed |
108 | * information below if they desire | |
109 | */ | |
110 | u_int32_t erasesize; | |
783ed81f AB |
111 | /* Minimal writable flash unit size. In case of NOR flash it is 1 (even |
112 | * though individual bits can be cleared), in case of NAND flash it is | |
113 | * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR | |
114 | * it is of ECC block size, etc. It is illegal to have writesize = 0. | |
115 | * Any driver registering a struct mtd_info must ensure a writesize of | |
116 | * 1 or larger. | |
28318776 JE |
117 | */ |
118 | u_int32_t writesize; | |
1da177e4 | 119 | |
1da177e4 | 120 | u_int32_t oobsize; // Amount of OOB data per block (e.g. 16) |
1f92267c | 121 | u_int32_t oobavail; // Available OOB bytes per block |
638d9838 | 122 | |
1da177e4 LT |
123 | // Kernel-only stuff starts here. |
124 | char *name; | |
125 | int index; | |
126 | ||
5bd34c09 TG |
127 | /* ecc layout structure pointer - read only ! */ |
128 | struct nand_ecclayout *ecclayout; | |
1da177e4 LT |
129 | |
130 | /* Data for variable erase regions. If numeraseregions is zero, | |
61ecfa87 | 131 | * it means that the whole device has erasesize as given above. |
1da177e4 LT |
132 | */ |
133 | int numeraseregions; | |
61ecfa87 | 134 | struct mtd_erase_region_info *eraseregions; |
1da177e4 | 135 | |
b38178ee JE |
136 | /* |
137 | * Erase is an asynchronous operation. Device drivers are supposed | |
138 | * to call instr->callback() whenever the operation completes, even | |
139 | * if it completes with a failure. | |
140 | * Callers are supposed to pass a callback function and wait for it | |
141 | * to be called before writing to the block. | |
142 | */ | |
1da177e4 LT |
143 | int (*erase) (struct mtd_info *mtd, struct erase_info *instr); |
144 | ||
145 | /* This stuff for eXecute-In-Place */ | |
146 | int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf); | |
147 | ||
148 | /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ | |
149 | void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len); | |
150 | ||
151 | ||
152 | int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); | |
153 | int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); | |
154 | ||
388bbb09 RP |
155 | /* In blackbox flight recorder like scenarios we want to make successful |
156 | writes in interrupt context. panic_write() is only intended to be | |
157 | called when its known the kernel is about to panic and we need the | |
158 | write to succeed. Since the kernel is not going to be running for much | |
159 | longer, this function can break locks and delay to ensure the write | |
160 | succeeds (but not sleep). */ | |
161 | ||
162 | int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); | |
163 | ||
8593fbc6 TG |
164 | int (*read_oob) (struct mtd_info *mtd, loff_t from, |
165 | struct mtd_oob_ops *ops); | |
166 | int (*write_oob) (struct mtd_info *mtd, loff_t to, | |
167 | struct mtd_oob_ops *ops); | |
1da177e4 | 168 | |
61ecfa87 TG |
169 | /* |
170 | * Methods to access the protection register area, present in some | |
1da177e4 | 171 | * flash devices. The user data is one time programmable but the |
61ecfa87 | 172 | * factory data is read only. |
1da177e4 | 173 | */ |
f77814dd | 174 | int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len); |
1da177e4 | 175 | int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); |
f77814dd NP |
176 | int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len); |
177 | int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); | |
1da177e4 | 178 | int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); |
f77814dd | 179 | int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len); |
1da177e4 | 180 | |
2528e8cd | 181 | /* kvec-based read/write methods. |
61ecfa87 | 182 | NB: The 'count' parameter is the number of _vectors_, each of |
1da177e4 LT |
183 | which contains an (ofs, len) tuple. |
184 | */ | |
1da177e4 | 185 | int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen); |
1da177e4 LT |
186 | |
187 | /* Sync */ | |
188 | void (*sync) (struct mtd_info *mtd); | |
189 | ||
190 | /* Chip-supported device locking */ | |
191 | int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len); | |
192 | int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len); | |
193 | ||
194 | /* Power Management functions */ | |
195 | int (*suspend) (struct mtd_info *mtd); | |
196 | void (*resume) (struct mtd_info *mtd); | |
197 | ||
198 | /* Bad block management functions */ | |
199 | int (*block_isbad) (struct mtd_info *mtd, loff_t ofs); | |
200 | int (*block_markbad) (struct mtd_info *mtd, loff_t ofs); | |
201 | ||
963a6fb0 NP |
202 | struct notifier_block reboot_notifier; /* default mode before reboot */ |
203 | ||
7fac4648 TG |
204 | /* ECC status information */ |
205 | struct mtd_ecc_stats ecc_stats; | |
29072b96 TG |
206 | /* Subpage shift (NAND) */ |
207 | int subpage_sft; | |
7fac4648 | 208 | |
1da177e4 LT |
209 | void *priv; |
210 | ||
211 | struct module *owner; | |
212 | int usecount; | |
9fe912ce AB |
213 | |
214 | /* If the driver is something smart, like UBI, it may need to maintain | |
215 | * its own reference counting. The below functions are only for driver. | |
216 | * The driver may register its callbacks. These callbacks are not | |
217 | * supposed to be called by MTD users */ | |
218 | int (*get_device) (struct mtd_info *mtd); | |
219 | void (*put_device) (struct mtd_info *mtd); | |
1da177e4 LT |
220 | }; |
221 | ||
222 | ||
223 | /* Kernel-side ioctl definitions */ | |
224 | ||
225 | extern int add_mtd_device(struct mtd_info *mtd); | |
226 | extern int del_mtd_device (struct mtd_info *mtd); | |
227 | ||
228 | extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num); | |
7799308f | 229 | extern struct mtd_info *get_mtd_device_nm(const char *name); |
1da177e4 LT |
230 | |
231 | extern void put_mtd_device(struct mtd_info *mtd); | |
232 | ||
233 | ||
234 | struct mtd_notifier { | |
235 | void (*add)(struct mtd_info *mtd); | |
236 | void (*remove)(struct mtd_info *mtd); | |
237 | struct list_head list; | |
238 | }; | |
239 | ||
240 | ||
241 | extern void register_mtd_user (struct mtd_notifier *new); | |
242 | extern int unregister_mtd_user (struct mtd_notifier *old); | |
243 | ||
244 | int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
245 | unsigned long count, loff_t to, size_t *retlen); | |
246 | ||
247 | int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs, | |
248 | unsigned long count, loff_t from, size_t *retlen); | |
249 | ||
1da177e4 LT |
250 | #ifdef CONFIG_MTD_PARTITIONS |
251 | void mtd_erase_callback(struct erase_info *instr); | |
252 | #else | |
253 | static inline void mtd_erase_callback(struct erase_info *instr) | |
254 | { | |
255 | if (instr->callback) | |
256 | instr->callback(instr); | |
257 | } | |
258 | #endif | |
259 | ||
260 | /* | |
261 | * Debugging macro and defines | |
262 | */ | |
263 | #define MTD_DEBUG_LEVEL0 (0) /* Quiet */ | |
264 | #define MTD_DEBUG_LEVEL1 (1) /* Audible */ | |
265 | #define MTD_DEBUG_LEVEL2 (2) /* Loud */ | |
266 | #define MTD_DEBUG_LEVEL3 (3) /* Noisy */ | |
267 | ||
268 | #ifdef CONFIG_MTD_DEBUG | |
269 | #define DEBUG(n, args...) \ | |
f4a43cfc | 270 | do { \ |
1da177e4 LT |
271 | if (n <= CONFIG_MTD_DEBUG_VERBOSE) \ |
272 | printk(KERN_INFO args); \ | |
273 | } while(0) | |
274 | #else /* CONFIG_MTD_DEBUG */ | |
275 | #define DEBUG(n, args...) do { } while(0) | |
276 | ||
277 | #endif /* CONFIG_MTD_DEBUG */ | |
278 | ||
279 | #endif /* __MTD_MTD_H__ */ |