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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 | ||
12 | #ifndef __KERNEL__ | |
13 | #error This is a kernel header. Perhaps include mtd-user.h instead? | |
14 | #endif | |
15 | ||
1da177e4 LT |
16 | #include <linux/types.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/uio.h> | |
963a6fb0 | 19 | #include <linux/notifier.h> |
1da177e4 LT |
20 | |
21 | #include <linux/mtd/compatmac.h> | |
22 | #include <mtd/mtd-abi.h> | |
23 | ||
24 | #define MTD_CHAR_MAJOR 90 | |
25 | #define MTD_BLOCK_MAJOR 31 | |
c0fe10ae | 26 | #define MAX_MTD_DEVICES 32 |
1da177e4 LT |
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 | /* If the erase fails, fail_addr might indicate exactly which block failed. If | |
35 | fail_addr = 0xffffffff, the failure was not at the device level or was not | |
36 | specific to any particular block. */ | |
37 | struct erase_info { | |
38 | struct mtd_info *mtd; | |
39 | u_int32_t addr; | |
40 | u_int32_t len; | |
41 | u_int32_t fail_addr; | |
42 | u_long time; | |
43 | u_long retries; | |
44 | u_int dev; | |
45 | u_int cell; | |
46 | void (*callback) (struct erase_info *self); | |
47 | u_long priv; | |
48 | u_char state; | |
49 | struct erase_info *next; | |
50 | }; | |
51 | ||
52 | struct mtd_erase_region_info { | |
53 | u_int32_t offset; /* At which this region starts, from the beginning of the MTD */ | |
54 | u_int32_t erasesize; /* For this region */ | |
55 | u_int32_t numblocks; /* Number of blocks of erasesize in this region */ | |
56 | }; | |
57 | ||
8593fbc6 TG |
58 | /* |
59 | * oob operation modes | |
60 | * | |
61 | * MTD_OOB_PLACE: oob data are placed at the given offset | |
62 | * MTD_OOB_AUTO: oob data are automatically placed at the free areas | |
63 | * which are defined by the ecclayout | |
64 | * MTD_OOB_RAW: mode to read raw data+oob in one chunk. The oob data | |
65 | * is inserted into the data. Thats a raw image of the | |
66 | * flash contents. | |
67 | */ | |
68 | typedef enum { | |
69 | MTD_OOB_PLACE, | |
70 | MTD_OOB_AUTO, | |
71 | MTD_OOB_RAW, | |
72 | } mtd_oob_mode_t; | |
73 | ||
74 | /** | |
75 | * struct mtd_oob_ops - oob operation operands | |
76 | * @mode: operation mode | |
77 | * | |
7014568b | 78 | * @len: number of data bytes to write/read |
8593fbc6 | 79 | * |
7014568b | 80 | * @retlen: number of data bytes written/read |
8593fbc6 | 81 | * |
7014568b VW |
82 | * @ooblen: number of oob bytes to write/read |
83 | * @oobretlen: number of oob bytes written/read | |
8593fbc6 TG |
84 | * @ooboffs: offset of oob data in the oob area (only relevant when |
85 | * mode = MTD_OOB_PLACE) | |
86 | * @datbuf: data buffer - if NULL only oob data are read/written | |
87 | * @oobbuf: oob data buffer | |
88 | */ | |
89 | struct mtd_oob_ops { | |
90 | mtd_oob_mode_t mode; | |
91 | size_t len; | |
92 | size_t retlen; | |
93 | size_t ooblen; | |
7014568b | 94 | size_t oobretlen; |
8593fbc6 TG |
95 | uint32_t ooboffs; |
96 | uint8_t *datbuf; | |
97 | uint8_t *oobbuf; | |
98 | }; | |
99 | ||
1da177e4 LT |
100 | struct mtd_info { |
101 | u_char type; | |
102 | u_int32_t flags; | |
103 | u_int32_t size; // Total size of the MTD | |
104 | ||
151e7659 | 105 | /* "Major" erase size for the device. Naïve users may take this |
1da177e4 LT |
106 | * to be the only erase size available, or may use the more detailed |
107 | * information below if they desire | |
108 | */ | |
109 | u_int32_t erasesize; | |
783ed81f AB |
110 | /* Minimal writable flash unit size. In case of NOR flash it is 1 (even |
111 | * though individual bits can be cleared), in case of NAND flash it is | |
112 | * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR | |
113 | * it is of ECC block size, etc. It is illegal to have writesize = 0. | |
114 | * Any driver registering a struct mtd_info must ensure a writesize of | |
115 | * 1 or larger. | |
28318776 JE |
116 | */ |
117 | u_int32_t writesize; | |
1da177e4 | 118 | |
1da177e4 | 119 | u_int32_t oobsize; // Amount of OOB data per block (e.g. 16) |
1da177e4 LT |
120 | u_int32_t ecctype; |
121 | u_int32_t eccsize; | |
638d9838 NP |
122 | |
123 | /* | |
124 | * Reuse some of the above unused fields in the case of NOR flash | |
125 | * with configurable programming regions to avoid modifying the | |
126 | * user visible structure layout/size. Only valid when the | |
127 | * MTD_PROGRAM_REGIONS flag is set. | |
128 | * (Maybe we should have an union for those?) | |
129 | */ | |
638d9838 NP |
130 | #define MTD_PROGREGION_CTRLMODE_VALID(mtd) (mtd)->oobsize |
131 | #define MTD_PROGREGION_CTRLMODE_INVALID(mtd) (mtd)->ecctype | |
1da177e4 LT |
132 | |
133 | // Kernel-only stuff starts here. | |
134 | char *name; | |
135 | int index; | |
136 | ||
5bd34c09 TG |
137 | /* ecc layout structure pointer - read only ! */ |
138 | struct nand_ecclayout *ecclayout; | |
1da177e4 LT |
139 | |
140 | /* Data for variable erase regions. If numeraseregions is zero, | |
61ecfa87 | 141 | * it means that the whole device has erasesize as given above. |
1da177e4 LT |
142 | */ |
143 | int numeraseregions; | |
61ecfa87 | 144 | struct mtd_erase_region_info *eraseregions; |
1da177e4 LT |
145 | |
146 | /* This really shouldn't be here. It can go away in 2.5 */ | |
147 | u_int32_t bank_size; | |
148 | ||
149 | int (*erase) (struct mtd_info *mtd, struct erase_info *instr); | |
150 | ||
151 | /* This stuff for eXecute-In-Place */ | |
152 | int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf); | |
153 | ||
154 | /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ | |
155 | void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len); | |
156 | ||
157 | ||
158 | int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); | |
159 | int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); | |
160 | ||
8593fbc6 TG |
161 | int (*read_oob) (struct mtd_info *mtd, loff_t from, |
162 | struct mtd_oob_ops *ops); | |
163 | int (*write_oob) (struct mtd_info *mtd, loff_t to, | |
164 | struct mtd_oob_ops *ops); | |
1da177e4 | 165 | |
61ecfa87 TG |
166 | /* |
167 | * Methods to access the protection register area, present in some | |
1da177e4 | 168 | * flash devices. The user data is one time programmable but the |
61ecfa87 | 169 | * factory data is read only. |
1da177e4 | 170 | */ |
f77814dd | 171 | int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len); |
1da177e4 | 172 | int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); |
f77814dd NP |
173 | int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len); |
174 | int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); | |
1da177e4 | 175 | int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); |
f77814dd | 176 | int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len); |
1da177e4 | 177 | |
2528e8cd | 178 | /* kvec-based read/write methods. |
61ecfa87 | 179 | NB: The 'count' parameter is the number of _vectors_, each of |
1da177e4 LT |
180 | which contains an (ofs, len) tuple. |
181 | */ | |
1da177e4 | 182 | int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen); |
1da177e4 LT |
183 | |
184 | /* Sync */ | |
185 | void (*sync) (struct mtd_info *mtd); | |
186 | ||
187 | /* Chip-supported device locking */ | |
188 | int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len); | |
189 | int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len); | |
190 | ||
191 | /* Power Management functions */ | |
192 | int (*suspend) (struct mtd_info *mtd); | |
193 | void (*resume) (struct mtd_info *mtd); | |
194 | ||
195 | /* Bad block management functions */ | |
196 | int (*block_isbad) (struct mtd_info *mtd, loff_t ofs); | |
197 | int (*block_markbad) (struct mtd_info *mtd, loff_t ofs); | |
198 | ||
963a6fb0 NP |
199 | struct notifier_block reboot_notifier; /* default mode before reboot */ |
200 | ||
7fac4648 TG |
201 | /* ECC status information */ |
202 | struct mtd_ecc_stats ecc_stats; | |
29072b96 TG |
203 | /* Subpage shift (NAND) */ |
204 | int subpage_sft; | |
7fac4648 | 205 | |
1da177e4 LT |
206 | void *priv; |
207 | ||
208 | struct module *owner; | |
209 | int usecount; | |
210 | }; | |
211 | ||
212 | ||
213 | /* Kernel-side ioctl definitions */ | |
214 | ||
215 | extern int add_mtd_device(struct mtd_info *mtd); | |
216 | extern int del_mtd_device (struct mtd_info *mtd); | |
217 | ||
218 | extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num); | |
219 | ||
220 | extern void put_mtd_device(struct mtd_info *mtd); | |
221 | ||
222 | ||
223 | struct mtd_notifier { | |
224 | void (*add)(struct mtd_info *mtd); | |
225 | void (*remove)(struct mtd_info *mtd); | |
226 | struct list_head list; | |
227 | }; | |
228 | ||
229 | ||
230 | extern void register_mtd_user (struct mtd_notifier *new); | |
231 | extern int unregister_mtd_user (struct mtd_notifier *old); | |
232 | ||
233 | int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
234 | unsigned long count, loff_t to, size_t *retlen); | |
235 | ||
236 | int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs, | |
237 | unsigned long count, loff_t from, size_t *retlen); | |
238 | ||
1da177e4 LT |
239 | #ifdef CONFIG_MTD_PARTITIONS |
240 | void mtd_erase_callback(struct erase_info *instr); | |
241 | #else | |
242 | static inline void mtd_erase_callback(struct erase_info *instr) | |
243 | { | |
244 | if (instr->callback) | |
245 | instr->callback(instr); | |
246 | } | |
247 | #endif | |
248 | ||
249 | /* | |
250 | * Debugging macro and defines | |
251 | */ | |
252 | #define MTD_DEBUG_LEVEL0 (0) /* Quiet */ | |
253 | #define MTD_DEBUG_LEVEL1 (1) /* Audible */ | |
254 | #define MTD_DEBUG_LEVEL2 (2) /* Loud */ | |
255 | #define MTD_DEBUG_LEVEL3 (3) /* Noisy */ | |
256 | ||
257 | #ifdef CONFIG_MTD_DEBUG | |
258 | #define DEBUG(n, args...) \ | |
f4a43cfc | 259 | do { \ |
1da177e4 LT |
260 | if (n <= CONFIG_MTD_DEBUG_VERBOSE) \ |
261 | printk(KERN_INFO args); \ | |
262 | } while(0) | |
263 | #else /* CONFIG_MTD_DEBUG */ | |
264 | #define DEBUG(n, args...) do { } while(0) | |
265 | ||
266 | #endif /* CONFIG_MTD_DEBUG */ | |
267 | ||
268 | #endif /* __MTD_MTD_H__ */ |