mtd.h
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上传日期:2009-04-28
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- /*
- * $Id: mtd.h,v 1.59 2005/04/11 10:19:02 gleixner Exp $
- *
- * Copyright (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> et al.
- *
- * Released under GPL
- */
- #ifndef __MTD_MTD_H__
- #define __MTD_MTD_H__
- #ifndef __KERNEL__
- #error This is a kernel header. Perhaps include mtd-user.h instead?
- #endif
- #include <linux/config.h>
- #include <linux/version.h>
- #include <linux/types.h>
- #include <linux/module.h>
- #include <linux/uio.h>
- #include <linux/notifier.h>
- #include <linux/mtd/compatmac.h>
- #include <mtd/mtd-abi.h>
- #define MTD_CHAR_MAJOR 90
- #define MTD_BLOCK_MAJOR 31
- #define MAX_MTD_DEVICES 16
- #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 */
- };
- 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. Na飗e 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;
- u_int32_t oobblock; // Size of OOB blocks (e.g. 512)
- u_int32_t oobsize; // Amount of OOB data per block (e.g. 16)
- u_int32_t ecctype;
- u_int32_t eccsize;
-
- // Kernel-only stuff starts here.
- char *name;
- int index;
- // oobinfo is a nand_oobinfo structure, which can be set by iotcl (MEMSETOOBINFO)
- struct nand_oobinfo oobinfo;
- u_int32_t oobavail; // Number of bytes in OOB area available for fs
- /* 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;
- /* This really shouldn't be here. It can go away in 2.5 */
- u_int32_t bank_size;
- 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_ecc) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf, u_char *eccbuf, struct nand_oobinfo *oobsel);
- int (*write_ecc) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf, u_char *eccbuf, struct nand_oobinfo *oobsel);
- int (*read_oob) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
- int (*write_oob) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
- /*
- * 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. We need these especially for NAND flash,
- with its limited number of write cycles per erase.
- NB: The 'count' parameter is the number of _vectors_, each of
- which contains an (ofs, len) tuple.
- */
- int (*readv) (struct mtd_info *mtd, struct kvec *vecs, unsigned long count, loff_t from, size_t *retlen);
- int (*readv_ecc) (struct mtd_info *mtd, struct kvec *vecs, unsigned long count, loff_t from,
- size_t *retlen, u_char *eccbuf, struct nand_oobinfo *oobsel);
- int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
- int (*writev_ecc) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to,
- size_t *retlen, u_char *eccbuf, struct nand_oobinfo *oobsel);
- /* 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 */
- void *priv;
- struct module *owner;
- int usecount;
- };
- /* 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 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);
- #define MTD_ERASE(mtd, args...) (*(mtd->erase))(mtd, args)
- #define MTD_POINT(mtd, a,b,c,d) (*(mtd->point))(mtd, a,b,c, (u_char **)(d))
- #define MTD_UNPOINT(mtd, arg) (*(mtd->unpoint))(mtd, (u_char *)arg)
- #define MTD_READ(mtd, args...) (*(mtd->read))(mtd, args)
- #define MTD_WRITE(mtd, args...) (*(mtd->write))(mtd, args)
- #define MTD_READV(mtd, args...) (*(mtd->readv))(mtd, args)
- #define MTD_WRITEV(mtd, args...) (*(mtd->writev))(mtd, args)
- #define MTD_READECC(mtd, args...) (*(mtd->read_ecc))(mtd, args)
- #define MTD_WRITEECC(mtd, args...) (*(mtd->write_ecc))(mtd, args)
- #define MTD_READOOB(mtd, args...) (*(mtd->read_oob))(mtd, args)
- #define MTD_WRITEOOB(mtd, args...) (*(mtd->write_oob))(mtd, args)
- #define MTD_SYNC(mtd) do { if (mtd->sync) (*(mtd->sync))(mtd); } while (0)
- #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__ */