1 /* 2 * $Id: mtd.h,v 1.61 2005/11/07 11:14:54 gleixner Exp $ 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 #include <linux/types.h> 13 #include <linux/mtd/mtd-abi.h> 14 15 #define MTD_CHAR_MAJOR 90 16 #define MTD_BLOCK_MAJOR 31 17 #define MAX_MTD_DEVICES 32 18 19 #define MTD_ERASE_PENDING 0x01 20 #define MTD_ERASING 0x02 21 #define MTD_ERASE_SUSPEND 0x04 22 #define MTD_ERASE_DONE 0x08 23 #define MTD_ERASE_FAILED 0x10 24 25 /* 26 * Enumeration for NAND/OneNAND flash chip state 27 */ 28 enum { 29 FL_READY, 30 FL_READING, 31 FL_WRITING, 32 FL_ERASING, 33 FL_SYNCING, 34 FL_CACHEDPRG, 35 FL_RESETING, 36 FL_UNLOCKING, 37 FL_LOCKING, 38 FL_PM_SUSPENDED, 39 }; 40 41 /* If the erase fails, fail_addr might indicate exactly which block failed. If 42 fail_addr = 0xffffffff, the failure was not at the device level or was not 43 specific to any particular block. */ 44 struct erase_info { 45 struct mtd_info *mtd; 46 u_int32_t addr; 47 u_int32_t len; 48 u_int32_t fail_addr; 49 u_long time; 50 u_long retries; 51 u_int dev; 52 u_int cell; 53 void (*callback) (struct erase_info *self); 54 u_long priv; 55 u_char state; 56 struct erase_info *next; 57 }; 58 59 struct mtd_erase_region_info { 60 u_int32_t offset; /* At which this region starts, from the beginning of the MTD */ 61 u_int32_t erasesize; /* For this region */ 62 u_int32_t numblocks; /* Number of blocks of erasesize in this region */ 63 unsigned long *lockmap; /* If keeping bitmap of locks */ 64 }; 65 66 /* 67 * oob operation modes 68 * 69 * MTD_OOB_PLACE: oob data are placed at the given offset 70 * MTD_OOB_AUTO: oob data are automatically placed at the free areas 71 * which are defined by the ecclayout 72 * MTD_OOB_RAW: mode to read raw data+oob in one chunk. The oob data 73 * is inserted into the data. Thats a raw image of the 74 * flash contents. 75 */ 76 typedef enum { 77 MTD_OOB_PLACE, 78 MTD_OOB_AUTO, 79 MTD_OOB_RAW, 80 } mtd_oob_mode_t; 81 82 /** 83 * struct mtd_oob_ops - oob operation operands 84 * @mode: operation mode 85 * 86 * @len: number of data bytes to write/read 87 * 88 * @retlen: number of data bytes written/read 89 * 90 * @ooblen: number of oob bytes to write/read 91 * @oobretlen: number of oob bytes written/read 92 * @ooboffs: offset of oob data in the oob area (only relevant when 93 * mode = MTD_OOB_PLACE) 94 * @datbuf: data buffer - if NULL only oob data are read/written 95 * @oobbuf: oob data buffer 96 * 97 * Note, it is allowed to read more then one OOB area at one go, but not write. 98 * The interface assumes that the OOB write requests program only one page's 99 * OOB area. 100 */ 101 struct mtd_oob_ops { 102 mtd_oob_mode_t mode; 103 size_t len; 104 size_t retlen; 105 size_t ooblen; 106 size_t oobretlen; 107 uint32_t ooboffs; 108 uint8_t *datbuf; 109 uint8_t *oobbuf; 110 }; 111 112 struct mtd_info { 113 u_char type; 114 u_int32_t flags; 115 u_int32_t size; // Total size of the MTD 116 117 /* "Major" erase size for the device. Naïve users may take this 118 * to be the only erase size available, or may use the more detailed 119 * information below if they desire 120 */ 121 u_int32_t erasesize; 122 /* Minimal writable flash unit size. In case of NOR flash it is 1 (even 123 * though individual bits can be cleared), in case of NAND flash it is 124 * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR 125 * it is of ECC block size, etc. It is illegal to have writesize = 0. 126 * Any driver registering a struct mtd_info must ensure a writesize of 127 * 1 or larger. 128 */ 129 u_int32_t writesize; 130 131 u_int32_t oobsize; // Amount of OOB data per block (e.g. 16) 132 u_int32_t oobavail; // Available OOB bytes per block 133 134 // Kernel-only stuff starts here. 135 char *name; 136 int index; 137 138 /* ecc layout structure pointer - read only ! */ 139 struct nand_ecclayout *ecclayout; 140 141 /* Data for variable erase regions. If numeraseregions is zero, 142 * it means that the whole device has erasesize as given above. 143 */ 144 int numeraseregions; 145 struct mtd_erase_region_info *eraseregions; 146 147 int (*erase) (struct mtd_info *mtd, struct erase_info *instr); 148 149 /* This stuff for eXecute-In-Place */ 150 int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf); 151 152 /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ 153 void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len); 154 155 156 int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); 157 int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); 158 159 int (*read_oob) (struct mtd_info *mtd, loff_t from, 160 struct mtd_oob_ops *ops); 161 int (*write_oob) (struct mtd_info *mtd, loff_t to, 162 struct mtd_oob_ops *ops); 163 164 /* 165 * Methods to access the protection register area, present in some 166 * flash devices. The user data is one time programmable but the 167 * factory data is read only. 168 */ 169 int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len); 170 int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); 171 int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len); 172 int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); 173 int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); 174 int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len); 175 176 /* XXX U-BOOT XXX */ 177 #if 0 178 /* kvec-based read/write methods. 179 NB: The 'count' parameter is the number of _vectors_, each of 180 which contains an (ofs, len) tuple. 181 */ 182 int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen); 183 #endif 184 185 /* Sync */ 186 void (*sync) (struct mtd_info *mtd); 187 188 /* Chip-supported device locking */ 189 int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len); 190 int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len); 191 192 /* Power Management functions */ 193 int (*suspend) (struct mtd_info *mtd); 194 void (*resume) (struct mtd_info *mtd); 195 196 /* Bad block management functions */ 197 int (*block_isbad) (struct mtd_info *mtd, loff_t ofs); 198 int (*block_markbad) (struct mtd_info *mtd, loff_t ofs); 199 200 /* XXX U-BOOT XXX */ 201 #if 0 202 struct notifier_block reboot_notifier; /* default mode before reboot */ 203 #endif 204 205 /* ECC status information */ 206 struct mtd_ecc_stats ecc_stats; 207 /* Subpage shift (NAND) */ 208 int subpage_sft; 209 210 void *priv; 211 212 struct module *owner; 213 int usecount; 214 215 /* If the driver is something smart, like UBI, it may need to maintain 216 * its own reference counting. The below functions are only for driver. 217 * The driver may register its callbacks. These callbacks are not 218 * supposed to be called by MTD users */ 219 int (*get_device) (struct mtd_info *mtd); 220 void (*put_device) (struct mtd_info *mtd); 221 }; 222 223 224 /* Kernel-side ioctl definitions */ 225 226 extern int add_mtd_device(struct mtd_info *mtd); 227 extern int del_mtd_device (struct mtd_info *mtd); 228 229 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num); 230 extern struct mtd_info *get_mtd_device_nm(const char *name); 231 232 extern void put_mtd_device(struct mtd_info *mtd); 233 234 /* XXX U-BOOT XXX */ 235 #if 0 236 struct mtd_notifier { 237 void (*add)(struct mtd_info *mtd); 238 void (*remove)(struct mtd_info *mtd); 239 struct list_head list; 240 }; 241 242 extern void register_mtd_user (struct mtd_notifier *new); 243 extern int unregister_mtd_user (struct mtd_notifier *old); 244 245 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, 246 unsigned long count, loff_t to, size_t *retlen); 247 248 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs, 249 unsigned long count, loff_t from, size_t *retlen); 250 #endif 251 252 #ifdef CONFIG_MTD_PARTITIONS 253 void mtd_erase_callback(struct erase_info *instr); 254 #else 255 static inline void mtd_erase_callback(struct erase_info *instr) 256 { 257 if (instr->callback) 258 instr->callback(instr); 259 } 260 #endif 261 262 /* 263 * Debugging macro and defines 264 */ 265 #define MTD_DEBUG_LEVEL0 (0) /* Quiet */ 266 #define MTD_DEBUG_LEVEL1 (1) /* Audible */ 267 #define MTD_DEBUG_LEVEL2 (2) /* Loud */ 268 #define MTD_DEBUG_LEVEL3 (3) /* Noisy */ 269 270 #ifdef CONFIG_MTD_DEBUG 271 #define MTDDEBUG(n, args...) \ 272 do { \ 273 if (n <= CONFIG_MTD_DEBUG_VERBOSE) \ 274 printk(KERN_INFO args); \ 275 } while(0) 276 #else /* CONFIG_MTD_DEBUG */ 277 #define MTDDEBUG(n, args...) do { } while(0) 278 #endif /* CONFIG_MTD_DEBUG */ 279 280 #endif /* __MTD_MTD_H__ */ 281