282 lines
8.7 KiB
C
282 lines
8.7 KiB
C
/*
|
|
* $Id: mtd.h,v 1.61 2005/11/07 11:14:54 gleixner Exp $
|
|
*
|
|
* Copyright (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> et al.
|
|
*
|
|
* Released under GPL
|
|
*/
|
|
|
|
#ifndef __MTD_MTD_H__
|
|
#define __MTD_MTD_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 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;
|
|
|
|
/*
|
|
* Erase is an asynchronous operation. Device drivers are supposed
|
|
* to call instr->callback() whenever the operation completes, even
|
|
* if it completes with a failure.
|
|
* Callers are supposed to pass a callback function and wait for it
|
|
* to be called before writing to the block.
|
|
*/
|
|
int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
|
|
|
|
/* This stuff for eXecute-In-Place */
|
|
/* phys is optional and may be set to NULL */
|
|
int (*point) (struct mtd_info *mtd, loff_t from, size_t len,
|
|
size_t *retlen, void **virt, resource_size_t *phys);
|
|
|
|
/* We probably shouldn't allow XIP if the unpoint isn't a NULL */
|
|
void (*unpoint) (struct mtd_info *mtd, 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);
|
|
|
|
/* In blackbox flight recorder like scenarios we want to make successful
|
|
writes in interrupt context. panic_write() is only intended to be
|
|
called when its known the kernel is about to panic and we need the
|
|
write to succeed. Since the kernel is not going to be running for much
|
|
longer, this function can break locks and delay to ensure the write
|
|
succeeds (but not sleep). */
|
|
|
|
int (*panic_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__ */
|