240 lines
8.1 KiB
C
240 lines
8.1 KiB
C
/*
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* $Id: mtd.h,v 1.61 2005/11/07 11:14:54 gleixner Exp $
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*
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* Copyright (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> et al.
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*
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* Released under GPL
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*/
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#ifndef __MTD_MTD_H__
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#define __MTD_MTD_H__
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#ifndef __KERNEL__
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#error This is a kernel header. Perhaps include mtd-user.h instead?
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#endif
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#include <linux/config.h>
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#include <linux/version.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/uio.h>
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#include <linux/notifier.h>
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#include <linux/mtd/compatmac.h>
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#include <mtd/mtd-abi.h>
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#define MTD_CHAR_MAJOR 90
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#define MTD_BLOCK_MAJOR 31
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#define MAX_MTD_DEVICES 16
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#define MTD_ERASE_PENDING 0x01
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#define MTD_ERASING 0x02
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#define MTD_ERASE_SUSPEND 0x04
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#define MTD_ERASE_DONE 0x08
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#define MTD_ERASE_FAILED 0x10
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/* If the erase fails, fail_addr might indicate exactly which block failed. If
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fail_addr = 0xffffffff, the failure was not at the device level or was not
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specific to any particular block. */
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struct erase_info {
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struct mtd_info *mtd;
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u_int32_t addr;
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u_int32_t len;
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u_int32_t fail_addr;
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u_long time;
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u_long retries;
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u_int dev;
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u_int cell;
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void (*callback) (struct erase_info *self);
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u_long priv;
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u_char state;
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struct erase_info *next;
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};
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struct mtd_erase_region_info {
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u_int32_t offset; /* At which this region starts, from the beginning of the MTD */
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u_int32_t erasesize; /* For this region */
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u_int32_t numblocks; /* Number of blocks of erasesize in this region */
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};
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struct mtd_info {
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u_char type;
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u_int32_t flags;
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u_int32_t size; // Total size of the MTD
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/* "Major" erase size for the device. Naïve users may take this
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* to be the only erase size available, or may use the more detailed
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* information below if they desire
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*/
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u_int32_t erasesize;
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u_int32_t oobblock; // Size of OOB blocks (e.g. 512)
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u_int32_t oobsize; // Amount of OOB data per block (e.g. 16)
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u_int32_t ecctype;
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u_int32_t eccsize;
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/*
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* Reuse some of the above unused fields in the case of NOR flash
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* with configurable programming regions to avoid modifying the
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* user visible structure layout/size. Only valid when the
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* MTD_PROGRAM_REGIONS flag is set.
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* (Maybe we should have an union for those?)
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*/
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#define MTD_PROGREGION_SIZE(mtd) (mtd)->oobblock
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#define MTD_PROGREGION_CTRLMODE_VALID(mtd) (mtd)->oobsize
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#define MTD_PROGREGION_CTRLMODE_INVALID(mtd) (mtd)->ecctype
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// Kernel-only stuff starts here.
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char *name;
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int index;
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// oobinfo is a nand_oobinfo structure, which can be set by iotcl (MEMSETOOBINFO)
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struct nand_oobinfo oobinfo;
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u_int32_t oobavail; // Number of bytes in OOB area available for fs
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/* Data for variable erase regions. If numeraseregions is zero,
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* it means that the whole device has erasesize as given above.
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*/
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int numeraseregions;
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struct mtd_erase_region_info *eraseregions;
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/* This really shouldn't be here. It can go away in 2.5 */
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u_int32_t bank_size;
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int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
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/* This stuff for eXecute-In-Place */
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int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
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/* We probably shouldn't allow XIP if the unpoint isn't a NULL */
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void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
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int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
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int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
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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);
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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);
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int (*read_oob) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
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int (*write_oob) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
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/*
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* Methods to access the protection register area, present in some
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* flash devices. The user data is one time programmable but the
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* factory data is read only.
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*/
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int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
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int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
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int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
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int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
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int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
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int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
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/* kvec-based read/write methods. We need these especially for NAND flash,
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with its limited number of write cycles per erase.
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NB: The 'count' parameter is the number of _vectors_, each of
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which contains an (ofs, len) tuple.
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*/
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int (*readv) (struct mtd_info *mtd, struct kvec *vecs, unsigned long count, loff_t from, size_t *retlen);
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int (*readv_ecc) (struct mtd_info *mtd, struct kvec *vecs, unsigned long count, loff_t from,
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size_t *retlen, u_char *eccbuf, struct nand_oobinfo *oobsel);
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int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
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int (*writev_ecc) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to,
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size_t *retlen, u_char *eccbuf, struct nand_oobinfo *oobsel);
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/* Sync */
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void (*sync) (struct mtd_info *mtd);
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/* Chip-supported device locking */
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int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
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int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
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/* Power Management functions */
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int (*suspend) (struct mtd_info *mtd);
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void (*resume) (struct mtd_info *mtd);
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/* Bad block management functions */
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int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
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int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
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struct notifier_block reboot_notifier; /* default mode before reboot */
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void *priv;
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struct module *owner;
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int usecount;
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};
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/* Kernel-side ioctl definitions */
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extern int add_mtd_device(struct mtd_info *mtd);
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extern int del_mtd_device (struct mtd_info *mtd);
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extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
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extern void put_mtd_device(struct mtd_info *mtd);
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struct mtd_notifier {
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void (*add)(struct mtd_info *mtd);
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void (*remove)(struct mtd_info *mtd);
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struct list_head list;
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};
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extern void register_mtd_user (struct mtd_notifier *new);
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extern int unregister_mtd_user (struct mtd_notifier *old);
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int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
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unsigned long count, loff_t to, size_t *retlen);
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int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
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unsigned long count, loff_t from, size_t *retlen);
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#define MTD_ERASE(mtd, args...) (*(mtd->erase))(mtd, args)
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#define MTD_POINT(mtd, a,b,c,d) (*(mtd->point))(mtd, a,b,c, (u_char **)(d))
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#define MTD_UNPOINT(mtd, arg) (*(mtd->unpoint))(mtd, (u_char *)arg)
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#define MTD_READ(mtd, args...) (*(mtd->read))(mtd, args)
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#define MTD_WRITE(mtd, args...) (*(mtd->write))(mtd, args)
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#define MTD_READV(mtd, args...) (*(mtd->readv))(mtd, args)
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#define MTD_WRITEV(mtd, args...) (*(mtd->writev))(mtd, args)
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#define MTD_READECC(mtd, args...) (*(mtd->read_ecc))(mtd, args)
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#define MTD_WRITEECC(mtd, args...) (*(mtd->write_ecc))(mtd, args)
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#define MTD_READOOB(mtd, args...) (*(mtd->read_oob))(mtd, args)
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#define MTD_WRITEOOB(mtd, args...) (*(mtd->write_oob))(mtd, args)
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#define MTD_SYNC(mtd) do { if (mtd->sync) (*(mtd->sync))(mtd); } while (0)
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#ifdef CONFIG_MTD_PARTITIONS
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void mtd_erase_callback(struct erase_info *instr);
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#else
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static inline void mtd_erase_callback(struct erase_info *instr)
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{
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if (instr->callback)
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instr->callback(instr);
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}
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#endif
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/*
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* Debugging macro and defines
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*/
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#define MTD_DEBUG_LEVEL0 (0) /* Quiet */
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#define MTD_DEBUG_LEVEL1 (1) /* Audible */
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#define MTD_DEBUG_LEVEL2 (2) /* Loud */
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#define MTD_DEBUG_LEVEL3 (3) /* Noisy */
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#ifdef CONFIG_MTD_DEBUG
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#define DEBUG(n, args...) \
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do { \
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if (n <= CONFIG_MTD_DEBUG_VERBOSE) \
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printk(KERN_INFO args); \
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} while(0)
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#else /* CONFIG_MTD_DEBUG */
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#define DEBUG(n, args...) do { } while(0)
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#endif /* CONFIG_MTD_DEBUG */
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#endif /* __MTD_MTD_H__ */
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