mtd.h
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上传日期:2013-02-24
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- /* $Id: mtd.h,v 1.34 2001/11/27 14:55:12 cdavies Exp $ */
- #ifndef __MTD_MTD_H__
- #define __MTD_MTD_H__
- #ifdef __KERNEL__
- #include <linux/config.h>
- #include <linux/version.h>
- #include <linux/types.h>
- #include <linux/mtd/compatmac.h>
- #include <linux/module.h>
- #include <linux/uio.h>
- #endif /* __KERNEL__ */
- struct erase_info_user {
- u_int32_t start;
- u_int32_t length;
- };
- struct mtd_oob_buf {
- u_int32_t start;
- u_int32_t length;
- unsigned char *ptr;
- };
- #define MTD_CHAR_MAJOR 90
- #define MTD_BLOCK_MAJOR 31
- #define MAX_MTD_DEVICES 16
- #define MTD_ABSENT 0
- #define MTD_RAM 1
- #define MTD_ROM 2
- #define MTD_NORFLASH 3
- #define MTD_NANDFLASH 4
- #define MTD_PEROM 5
- #define MTD_OTHER 14
- #define MTD_UNKNOWN 15
- #define MTD_CLEAR_BITS 1 // Bits can be cleared (flash)
- #define MTD_SET_BITS 2 // Bits can be set
- #define MTD_ERASEABLE 4 // Has an erase function
- #define MTD_WRITEB_WRITEABLE 8 // Direct IO is possible
- #define MTD_VOLATILE 16 // Set for RAMs
- #define MTD_XIP 32 // eXecute-In-Place possible
- #define MTD_OOB 64 // Out-of-band data (NAND flash)
- #define MTD_ECC 128 // Device capable of automatic ECC
- // Some common devices / combinations of capabilities
- #define MTD_CAP_ROM 0
- #define MTD_CAP_RAM (MTD_CLEAR_BITS|MTD_SET_BITS|MTD_WRITEB_WRITEABLE)
- #define MTD_CAP_NORFLASH (MTD_CLEAR_BITS|MTD_ERASEABLE)
- #define MTD_CAP_NANDFLASH (MTD_CLEAR_BITS|MTD_ERASEABLE|MTD_OOB)
- #define MTD_WRITEABLE (MTD_CLEAR_BITS|MTD_SET_BITS)
- // Types of automatic ECC/Checksum available
- #define MTD_ECC_NONE 0 // No automatic ECC available
- #define MTD_ECC_RS_DiskOnChip 1 // Automatic ECC on DiskOnChip
- #define MTD_ECC_SW 2 // SW ECC for Toshiba & Samsung devices
- struct mtd_info_user {
- u_char type;
- u_int32_t flags;
- u_int32_t size; // Total size of the MTD
- 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;
- };
- struct region_info_user {
- 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 in this region */
- u_int32_t regionindex;
- };
- #define MEMGETINFO _IOR('M', 1, struct mtd_info_user)
- #define MEMERASE _IOW('M', 2, struct erase_info_user)
- #define MEMWRITEOOB _IOWR('M', 3, struct mtd_oob_buf)
- #define MEMREADOOB _IOWR('M', 4, struct mtd_oob_buf)
- #define MEMLOCK _IOW('M', 5, struct erase_info_user)
- #define MEMUNLOCK _IOW('M', 6, struct erase_info_user)
- #define MEMGETREGIONCOUNT _IOR('M', 7, int)
- #define MEMGETREGIONINFO _IOWR('M', 8, struct region_info_user)
- #ifndef __KERNEL__
- typedef struct mtd_info_user mtd_info_t;
- typedef struct erase_info_user erase_info_t;
- typedef struct region_info_user region_info_t;
- /* User-space ioctl definitions */
- #else /* __KERNEL__ */
- #define MTD_ERASE_PENDING 0x01
- #define MTD_ERASING 0x02
- #define MTD_ERASE_SUSPEND 0x04
- #define MTD_ERASE_DONE 0x08
- #define MTD_ERASE_FAILED 0x10
- struct erase_info {
- struct mtd_info *mtd;
- u_int32_t addr;
- u_int32_t len;
- 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;
- /* 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;
- struct module *module;
- 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);
- 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);
- int (*write_ecc) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf, u_char *eccbuf);
- 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 (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
- int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
- /* This function is not yet implemented */
- int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
- /* iovec-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 iovec *vecs, unsigned long count, loff_t from, size_t *retlen);
- int (*writev) (struct mtd_info *mtd, const struct iovec *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);
- void *priv;
- };
- /* 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);
- static inline struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
- {
- struct mtd_info *ret;
-
- ret = __get_mtd_device(mtd, num);
- if (ret && ret->module && !try_inc_mod_count(ret->module))
- return NULL;
- return ret;
- }
- static inline void put_mtd_device(struct mtd_info *mtd)
- {
- if (mtd->module)
- __MOD_DEC_USE_COUNT(mtd->module);
- }
- struct mtd_notifier {
- void (*add)(struct mtd_info *mtd);
- void (*remove)(struct mtd_info *mtd);
- struct mtd_notifier *next;
- };
- extern void register_mtd_user (struct mtd_notifier *new);
- extern int unregister_mtd_user (struct mtd_notifier *old);
- #ifndef MTDC
- #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)
- #endif /* MTDC */
- /*
- * 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...)
- if (n <= CONFIG_MTD_DEBUG_VERBOSE) {
- printk(KERN_INFO args);
- }
- #else /* CONFIG_MTD_DEBUG */
- #define DEBUG(n, args...)
- #endif /* CONFIG_MTD_DEBUG */
- #endif /* __KERNEL__ */
- #endif /* __MTD_MTD_H__ */