/* * $Id: mtd.h,v 1.61 2005/11/07 11:14:54 gleixner Exp $ * * Copyright (C) 1999-2003 David Woodhouse et al. * * Released under GPL */ #ifndef __MTD_MTD_H__ #define __MTD_MTD_H__ #include #include #include #include #include #include #define MTD_CHAR_MAJOR 90 #define MTD_BLOCK_MAJOR 31 #define MAX_MTD_DEVICES 32 #define MTD_ERASE_PENDING 0x01 #define MTD_ERASING 0x02 #define MTD_ERASE_SUSPEND 0x04 #define MTD_ERASE_DONE 0x08 #define MTD_ERASE_FAILED 0x10 /* If the erase fails, fail_addr might indicate exactly which block failed. If fail_addr = 0xffffffff, the failure was not at the device level or was not specific to any particular block. */ struct erase_info { struct mtd_info *mtd; u_int32_t addr; u_int32_t len; u_int32_t fail_addr; u_long time; u_long retries; u_int dev; u_int cell; void (*callback) (struct erase_info *self); u_long priv; u_char state; struct erase_info *next; }; struct mtd_erase_region_info { u_int32_t offset; /* At which this region starts, from the beginning of the MTD */ u_int32_t erasesize; /* For this region */ u_int32_t numblocks; /* Number of blocks of erasesize in this region */ unsigned long *lockmap; /* If keeping bitmap of locks */ }; /* * oob operation modes * * MTD_OOB_PLACE: oob data are placed at the given offset * MTD_OOB_AUTO: oob data are automatically placed at the free areas * which are defined by the ecclayout * MTD_OOB_RAW: mode to read raw data+oob in one chunk. The oob data * is inserted into the data. Thats a raw image of the * flash contents. */ typedef enum { MTD_OOB_PLACE, MTD_OOB_AUTO, MTD_OOB_RAW, } mtd_oob_mode_t; /** * struct mtd_oob_ops - oob operation operands * @mode: operation mode * * @len: number of data bytes to write/read * * @retlen: number of data bytes written/read * * @ooblen: number of oob bytes to write/read * @oobretlen: number of oob bytes written/read * @ooboffs: offset of oob data in the oob area (only relevant when * mode = MTD_OOB_PLACE) * @datbuf: data buffer - if NULL only oob data are read/written * @oobbuf: oob data buffer * * Note, it is allowed to read more then one OOB area at one go, but not write. * The interface assumes that the OOB write requests program only one page's * OOB area. */ struct mtd_oob_ops { mtd_oob_mode_t mode; size_t len; size_t retlen; size_t ooblen; size_t oobretlen; uint32_t ooboffs; uint8_t *datbuf; uint8_t *oobbuf; }; struct mtd_info { u_char type; u_int32_t flags; u_int32_t size; // Total size of the MTD /* "Major" erase size for the device. Naïve users may take this * to be the only erase size available, or may use the more detailed * information below if they desire */ u_int32_t erasesize; /* Minimal writable flash unit size. In case of NOR flash it is 1 (even * though individual bits can be cleared), in case of NAND flash it is * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR * it is of ECC block size, etc. It is illegal to have writesize = 0. * Any driver registering a struct mtd_info must ensure a writesize of * 1 or larger. */ u_int32_t writesize; u_int32_t oobsize; // Amount of OOB data per block (e.g. 16) u_int32_t oobavail; // Available OOB bytes per block // Kernel-only stuff starts here. char *name; int index; /* ecc layout structure pointer - read only ! */ struct nand_ecclayout *ecclayout; /* Data for variable erase regions. If numeraseregions is zero, * it means that the whole device has erasesize as given above. */ int numeraseregions; struct mtd_erase_region_info *eraseregions; int (*erase) (struct mtd_info *mtd, struct erase_info *instr); /* This stuff for eXecute-In-Place */ int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf); /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len); int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); int (*read_oob) (struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops); int (*write_oob) (struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops); /* * Methods to access the protection register area, present in some * flash devices. The user data is one time programmable but the * factory data is read only. */ int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len); int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len); int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len); /* kvec-based read/write methods. NB: The 'count' parameter is the number of _vectors_, each of which contains an (ofs, len) tuple. */ int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen); /* Sync */ void (*sync) (struct mtd_info *mtd); /* Chip-supported device locking */ int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len); int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len); /* Power Management functions */ int (*suspend) (struct mtd_info *mtd); void (*resume) (struct mtd_info *mtd); /* Bad block management functions */ int (*block_isbad) (struct mtd_info *mtd, loff_t ofs); int (*block_markbad) (struct mtd_info *mtd, loff_t ofs); struct notifier_block reboot_notifier; /* default mode before reboot */ /* ECC status information */ struct mtd_ecc_stats ecc_stats; /* Subpage shift (NAND) */ int subpage_sft; void *priv; struct module *owner; int usecount; /* If the driver is something smart, like UBI, it may need to maintain * its own reference counting. The below functions are only for driver. * The driver may register its callbacks. These callbacks are not * supposed to be called by MTD users */ int (*get_device) (struct mtd_info *mtd); void (*put_device) (struct mtd_info *mtd); }; /* Kernel-side ioctl definitions */ extern int add_mtd_device(struct mtd_info *mtd); extern int del_mtd_device (struct mtd_info *mtd); extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num); extern struct mtd_info *get_mtd_device_nm(const char *name); extern void put_mtd_device(struct mtd_info *mtd); struct mtd_notifier { void (*add)(struct mtd_info *mtd); void (*remove)(struct mtd_info *mtd); struct list_head list; }; extern void register_mtd_user (struct mtd_notifier *new); extern int unregister_mtd_user (struct mtd_notifier *old); int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen); int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs, unsigned long count, loff_t from, size_t *retlen); #ifdef CONFIG_MTD_PARTITIONS void mtd_erase_callback(struct erase_info *instr); #else static inline void mtd_erase_callback(struct erase_info *instr) { if (instr->callback) instr->callback(instr); } #endif /* * Debugging macro and defines */ #define MTD_DEBUG_LEVEL0 (0) /* Quiet */ #define MTD_DEBUG_LEVEL1 (1) /* Audible */ #define MTD_DEBUG_LEVEL2 (2) /* Loud */ #define MTD_DEBUG_LEVEL3 (3) /* Noisy */ #ifdef CONFIG_MTD_DEBUG #define DEBUG(n, args...) \ do { \ if (n <= CONFIG_MTD_DEBUG_VERBOSE) \ printk(KERN_INFO args); \ } while(0) #else /* CONFIG_MTD_DEBUG */ #define DEBUG(n, args...) do { } while(0) #endif /* CONFIG_MTD_DEBUG */ #endif /* __MTD_MTD_H__ */