include/linux/mtd/mtd.h

   1 /*
   2  * $Id: mtd.h,v 1.59 2005/04/11 10:19:02 gleixner Exp $
   3  *
   4  * Copyright (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> et al.
   5  *
   6  * Released under GPL
   7  */
   8
   9 #ifndef __MTD_MTD_H__
  10 #define __MTD_MTD_H__
  11
  12 #ifndef __KERNEL__
  13 #error This is a kernel header. Perhaps include mtd-user.h instead?
  14 #endif
  15
  16 #include <linux/config.h>
  17 #include <linux/version.h>
  18 #include <linux/types.h>
  19 #include <linux/module.h>
  20 #include <linux/uio.h>
  21 #include <linux/notifier.h>
  22
  23 #include <linux/mtd/compatmac.h>
  24 #include <mtd/mtd-abi.h>
  25
  26 #define MTD_CHAR_MAJOR 90
  27 #define MTD_BLOCK_MAJOR 31
  28 #define MAX_MTD_DEVICES 16
  29
  30 #define MTD_ERASE_PENDING       0x01
  31 #define MTD_ERASING             0x02
  32 #define MTD_ERASE_SUSPEND       0x04
  33 #define MTD_ERASE_DONE          0x08
  34 #define MTD_ERASE_FAILED        0x10
  35
  36 /* If the erase fails, fail_addr might indicate exactly which block failed.  If
  37    fail_addr = 0xffffffff, the failure was not at the device level or was not
  38    specific to any particular block. */
  39 struct erase_info {
  40         struct mtd_info *mtd;
  41         u_int32_t addr;
  42         u_int32_t len;
  43         u_int32_t fail_addr;
  44         u_long time;
  45         u_long retries;
  46         u_int dev;
  47         u_int cell;
  48         void (*callback) (struct erase_info *self);
  49         u_long priv;
  50         u_char state;
  51         struct erase_info *next;
  52 };
  53
  54 struct mtd_erase_region_info {
  55         u_int32_t offset;                       /* At which this region starts, from the beginning of the MTD */
  56         u_int32_t erasesize;            /* For this region */
  57         u_int32_t numblocks;            /* Number of blocks of erasesize in this region */
  58 };
  59
  60 struct mtd_info {
  61         u_char type;
  62         u_int32_t flags;
  63         u_int32_t size;  // Total size of the MTD
  64
  65         /* "Major" erase size for the device. Naïve users may take this
  66          * to be the only erase size available, or may use the more detailed
  67          * information below if they desire
  68          */
  69         u_int32_t erasesize;
  70
  71         u_int32_t oobblock;  // Size of OOB blocks (e.g. 512)
  72         u_int32_t oobsize;   // Amount of OOB data per block (e.g. 16)
  73         u_int32_t ecctype;
  74         u_int32_t eccsize;
  75
  76
  77         // Kernel-only stuff starts here.
  78         char *name;
  79         int index;
  80
  81         // oobinfo is a nand_oobinfo structure, which can be set by iotcl (MEMSETOOBINFO)
  82         struct nand_oobinfo oobinfo;
  83         u_int32_t oobavail;  // Number of bytes in OOB area available for fs
  84
  85         /* Data for variable erase regions. If numeraseregions is zero,
  86          * it means that the whole device has erasesize as given above.
  87          */
  88         int numeraseregions;
  89         struct mtd_erase_region_info *eraseregions;
  90
  91         /* This really shouldn't be here. It can go away in 2.5 */
  92         u_int32_t bank_size;
  93
  94         int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
  95
  96         /* This stuff for eXecute-In-Place */
  97         int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
  98
  99         /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
 100         void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
 101
 102
 103         int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 104         int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 105
 106         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);
 107         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);
 108
 109         int (*read_oob) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 110         int (*write_oob) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 111
 112         /*
 113          * Methods to access the protection register area, present in some
 114          * flash devices. The user data is one time programmable but the
 115          * factory data is read only.
 116          */
 117         int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 118         int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 119         int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 120         int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 121         int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 122         int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
 123
 124         /* kvec-based read/write methods. We need these especially for NAND flash,
 125            with its limited number of write cycles per erase.
 126            NB: The 'count' parameter is the number of _vectors_, each of
 127            which contains an (ofs, len) tuple.
 128         */
 129         int (*readv) (struct mtd_info *mtd, struct kvec *vecs, unsigned long count, loff_t from, size_t *retlen);
 130         int (*readv_ecc) (struct mtd_info *mtd, struct kvec *vecs, unsigned long count, loff_t from,
 131                 size_t *retlen, u_char *eccbuf, struct nand_oobinfo *oobsel);
 132         int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
 133         int (*writev_ecc) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to,
 134                 size_t *retlen, u_char *eccbuf, struct nand_oobinfo *oobsel);
 135
 136         /* Sync */
 137         void (*sync) (struct mtd_info *mtd);
 138
 139         /* Chip-supported device locking */
 140         int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 141         int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 142
 143         /* Power Management functions */
 144         int (*suspend) (struct mtd_info *mtd);
 145         void (*resume) (struct mtd_info *mtd);
 146
 147         /* Bad block management functions */
 148         int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
 149         int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
 150
 151         struct notifier_block reboot_notifier;  /* default mode before reboot */
 152
 153         void *priv;
 154
 155         struct module *owner;
 156         int usecount;
 157 };
 158
 159
 160         /* Kernel-side ioctl definitions */
 161
 162 extern int add_mtd_device(struct mtd_info *mtd);
 163 extern int del_mtd_device (struct mtd_info *mtd);
 164
 165 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 166
 167 extern void put_mtd_device(struct mtd_info *mtd);
 168
 169
 170 struct mtd_notifier {
 171         void (*add)(struct mtd_info *mtd);
 172         void (*remove)(struct mtd_info *mtd);
 173         struct list_head list;
 174 };
 175
 176
 177 extern void register_mtd_user (struct mtd_notifier *new);
 178 extern int unregister_mtd_user (struct mtd_notifier *old);
 179
 180 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 181                        unsigned long count, loff_t to, size_t *retlen);
 182
 183 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
 184                       unsigned long count, loff_t from, size_t *retlen);
 185
 186 #define MTD_ERASE(mtd, args...) (*(mtd->erase))(mtd, args)
 187 #define MTD_POINT(mtd, a,b,c,d) (*(mtd->point))(mtd, a,b,c, (u_char **)(d))
 188 #define MTD_UNPOINT(mtd, arg) (*(mtd->unpoint))(mtd, (u_char *)arg)
 189 #define MTD_READ(mtd, args...) (*(mtd->read))(mtd, args)
 190 #define MTD_WRITE(mtd, args...) (*(mtd->write))(mtd, args)
 191 #define MTD_READV(mtd, args...) (*(mtd->readv))(mtd, args)
 192 #define MTD_WRITEV(mtd, args...) (*(mtd->writev))(mtd, args)
 193 #define MTD_READECC(mtd, args...) (*(mtd->read_ecc))(mtd, args)
 194 #define MTD_WRITEECC(mtd, args...) (*(mtd->write_ecc))(mtd, args)
 195 #define MTD_READOOB(mtd, args...) (*(mtd->read_oob))(mtd, args)
 196 #define MTD_WRITEOOB(mtd, args...) (*(mtd->write_oob))(mtd, args)
 197 #define MTD_SYNC(mtd) do { if (mtd->sync) (*(mtd->sync))(mtd);  } while (0)
 198
 199
 200 #ifdef CONFIG_MTD_PARTITIONS
 201 void mtd_erase_callback(struct erase_info *instr);
 202 #else
 203 static inline void mtd_erase_callback(struct erase_info *instr)
 204 {
 205         if (instr->callback)
 206                 instr->callback(instr);
 207 }
 208 #endif
 209
 210 /*
 211  * Debugging macro and defines
 212  */
 213 #define MTD_DEBUG_LEVEL0        (0)     /* Quiet   */
 214 #define MTD_DEBUG_LEVEL1        (1)     /* Audible */
 215 #define MTD_DEBUG_LEVEL2        (2)     /* Loud    */
 216 #define MTD_DEBUG_LEVEL3        (3)     /* Noisy   */
 217
 218 #ifdef CONFIG_MTD_DEBUG
 219 #define DEBUG(n, args...)                               \
 220         do {                                            \
 221                 if (n <= CONFIG_MTD_DEBUG_VERBOSE)      \
 222                         printk(KERN_INFO args);         \
 223         } while(0)
 224 #else /* CONFIG_MTD_DEBUG */
 225 #define DEBUG(n, args...) do { } while(0)
 226
 227 #endif /* CONFIG_MTD_DEBUG */
 228
 229 #endif /* __MTD_MTD_H__ */