include/linux/mtd/mtd.h

   1 /*
   2  * $Id: mtd.h,v 1.61 2005/11/07 11:14:54 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/types.h>
  18 #include <linux/module.h>
  19 #include <linux/uio.h>
  20 #include <linux/notifier.h>
  21
  22 #include <linux/mtd/compatmac.h>
  23 #include <mtd/mtd-abi.h>
  24
  25 #define MTD_CHAR_MAJOR 90
  26 #define MTD_BLOCK_MAJOR 31
  27 #define MAX_MTD_DEVICES 16
  28
  29 #define MTD_ERASE_PENDING       0x01
  30 #define MTD_ERASING             0x02
  31 #define MTD_ERASE_SUSPEND       0x04
  32 #define MTD_ERASE_DONE          0x08
  33 #define MTD_ERASE_FAILED        0x10
  34
  35 /* If the erase fails, fail_addr might indicate exactly which block failed.  If
  36    fail_addr = 0xffffffff, the failure was not at the device level or was not
  37    specific to any particular block. */
  38 struct erase_info {
  39         struct mtd_info *mtd;
  40         u_int32_t addr;
  41         u_int32_t len;
  42         u_int32_t fail_addr;
  43         u_long time;
  44         u_long retries;
  45         u_int dev;
  46         u_int cell;
  47         void (*callback) (struct erase_info *self);
  48         u_long priv;
  49         u_char state;
  50         struct erase_info *next;
  51 };
  52
  53 struct mtd_erase_region_info {
  54         u_int32_t offset;                       /* At which this region starts, from the beginning of the MTD */
  55         u_int32_t erasesize;            /* For this region */
  56         u_int32_t numblocks;            /* Number of blocks of erasesize in this region */
  57 };
  58
  59 struct mtd_info {
  60         u_char type;
  61         u_int32_t flags;
  62         u_int32_t size;  // Total size of the MTD
  63
  64         /* "Major" erase size for the device. Naïve users may take this
  65          * to be the only erase size available, or may use the more detailed
  66          * information below if they desire
  67          */
  68         u_int32_t erasesize;
  69         /* Smallest availlable size for writing to the device.  For NAND,
  70          * this is the page size, for some NOR chips, the size of ECC
  71          * covered blocks.
  72          */
  73         u_int32_t writesize;
  74
  75         u_int32_t oobsize;   // Amount of OOB data per block (e.g. 16)
  76         u_int32_t ecctype;
  77         u_int32_t eccsize;
  78
  79         /*
  80          * Reuse some of the above unused fields in the case of NOR flash
  81          * with configurable programming regions to avoid modifying the
  82          * user visible structure layout/size.  Only valid when the
  83          * MTD_PROGRAM_REGIONS flag is set.
  84          * (Maybe we should have an union for those?)
  85          */
  86 #define MTD_PROGREGION_CTRLMODE_VALID(mtd)  (mtd)->oobsize
  87 #define MTD_PROGREGION_CTRLMODE_INVALID(mtd)  (mtd)->ecctype
  88
  89         // Kernel-only stuff starts here.
  90         char *name;
  91         int index;
  92
  93         // oobinfo is a nand_oobinfo structure, which can be set by iotcl (MEMSETOOBINFO)
  94         struct nand_oobinfo oobinfo;
  95         u_int32_t oobavail;  // Number of bytes in OOB area available for fs
  96
  97         /* Data for variable erase regions. If numeraseregions is zero,
  98          * it means that the whole device has erasesize as given above.
  99          */
 100         int numeraseregions;
 101         struct mtd_erase_region_info *eraseregions;
 102
 103         /* This really shouldn't be here. It can go away in 2.5 */
 104         u_int32_t bank_size;
 105
 106         int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
 107
 108         /* This stuff for eXecute-In-Place */
 109         int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
 110
 111         /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
 112         void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
 113
 114
 115         int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 116         int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 117
 118         int (*read_oob) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 119         int (*write_oob) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 120
 121         /*
 122          * Methods to access the protection register area, present in some
 123          * flash devices. The user data is one time programmable but the
 124          * factory data is read only.
 125          */
 126         int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 127         int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 128         int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 129         int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 130         int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 131         int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
 132
 133         /* kvec-based read/write methods.
 134            NB: The 'count' parameter is the number of _vectors_, each of
 135            which contains an (ofs, len) tuple.
 136         */
 137         int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
 138
 139         /* Sync */
 140         void (*sync) (struct mtd_info *mtd);
 141
 142         /* Chip-supported device locking */
 143         int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 144         int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 145
 146         /* Power Management functions */
 147         int (*suspend) (struct mtd_info *mtd);
 148         void (*resume) (struct mtd_info *mtd);
 149
 150         /* Bad block management functions */
 151         int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
 152         int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
 153
 154         struct notifier_block reboot_notifier;  /* default mode before reboot */
 155
 156         void *priv;
 157
 158         struct module *owner;
 159         int usecount;
 160 };
 161
 162
 163         /* Kernel-side ioctl definitions */
 164
 165 extern int add_mtd_device(struct mtd_info *mtd);
 166 extern int del_mtd_device (struct mtd_info *mtd);
 167
 168 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 169
 170 extern void put_mtd_device(struct mtd_info *mtd);
 171
 172
 173 struct mtd_notifier {
 174         void (*add)(struct mtd_info *mtd);
 175         void (*remove)(struct mtd_info *mtd);
 176         struct list_head list;
 177 };
 178
 179
 180 extern void register_mtd_user (struct mtd_notifier *new);
 181 extern int unregister_mtd_user (struct mtd_notifier *old);
 182
 183 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 184                        unsigned long count, loff_t to, size_t *retlen);
 185
 186 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
 187                       unsigned long count, loff_t from, size_t *retlen);
 188
 189 #define MTD_ERASE(mtd, args...) (*(mtd->erase))(mtd, args)
 190 #define MTD_POINT(mtd, a,b,c,d) (*(mtd->point))(mtd, a,b,c, (u_char **)(d))
 191 #define MTD_UNPOINT(mtd, arg) (*(mtd->unpoint))(mtd, (u_char *)arg)
 192 #define MTD_READ(mtd, args...) (*(mtd->read))(mtd, args)
 193 #define MTD_WRITE(mtd, args...) (*(mtd->write))(mtd, args)
 194 #define MTD_READV(mtd, args...) (*(mtd->readv))(mtd, args)
 195 #define MTD_WRITEV(mtd, args...) (*(mtd->writev))(mtd, args)
 196 #define MTD_READECC(mtd, args...) (*(mtd->read_ecc))(mtd, args)
 197 #define MTD_WRITEECC(mtd, args...) (*(mtd->write_ecc))(mtd, args)
 198 #define MTD_READOOB(mtd, args...) (*(mtd->read_oob))(mtd, args)
 199 #define MTD_WRITEOOB(mtd, args...) (*(mtd->write_oob))(mtd, args)
 200 #define MTD_SYNC(mtd) do { if (mtd->sync) (*(mtd->sync))(mtd);  } while (0)
 201
 202
 203 #ifdef CONFIG_MTD_PARTITIONS
 204 void mtd_erase_callback(struct erase_info *instr);
 205 #else
 206 static inline void mtd_erase_callback(struct erase_info *instr)
 207 {
 208         if (instr->callback)
 209                 instr->callback(instr);
 210 }
 211 #endif
 212
 213 /*
 214  * Debugging macro and defines
 215  */
 216 #define MTD_DEBUG_LEVEL0        (0)     /* Quiet   */
 217 #define MTD_DEBUG_LEVEL1        (1)     /* Audible */
 218 #define MTD_DEBUG_LEVEL2        (2)     /* Loud    */
 219 #define MTD_DEBUG_LEVEL3        (3)     /* Noisy   */
 220
 221 #ifdef CONFIG_MTD_DEBUG
 222 #define DEBUG(n, args...)                               \
 223         do {                                            \
 224                 if (n <= CONFIG_MTD_DEBUG_VERBOSE)      \
 225                         printk(KERN_INFO args);         \
 226         } while(0)
 227 #else /* CONFIG_MTD_DEBUG */
 228 #define DEBUG(n, args...) do { } while(0)
 229
 230 #endif /* CONFIG_MTD_DEBUG */
 231
 232 #endif /* __MTD_MTD_H__ */