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/types.h>
  17 #include <linux/module.h>
  18 #include <linux/uio.h>
  19 #include <linux/notifier.h>
  20
  21 #include <linux/mtd/compatmac.h>
  22 #include <mtd/mtd-abi.h>
  23
  24 #define MTD_CHAR_MAJOR 90
  25 #define MTD_BLOCK_MAJOR 31
  26 #define MAX_MTD_DEVICES 32
  27
  28 #define MTD_ERASE_PENDING       0x01
  29 #define MTD_ERASING             0x02
  30 #define MTD_ERASE_SUSPEND       0x04
  31 #define MTD_ERASE_DONE          0x08
  32 #define MTD_ERASE_FAILED        0x10
  33
  34 /* If the erase fails, fail_addr might indicate exactly which block failed.  If
  35    fail_addr = 0xffffffff, the failure was not at the device level or was not
  36    specific to any particular block. */
  37 struct erase_info {
  38         struct mtd_info *mtd;
  39         u_int32_t addr;
  40         u_int32_t len;
  41         u_int32_t fail_addr;
  42         u_long time;
  43         u_long retries;
  44         u_int dev;
  45         u_int cell;
  46         void (*callback) (struct erase_info *self);
  47         u_long priv;
  48         u_char state;
  49         struct erase_info *next;
  50 };
  51
  52 struct mtd_erase_region_info {
  53         u_int32_t offset;                       /* At which this region starts, from the beginning of the MTD */
  54         u_int32_t erasesize;            /* For this region */
  55         u_int32_t numblocks;            /* Number of blocks of erasesize in this region */
  56 };
  57
  58 /*
  59  * oob operation modes
  60  *
  61  * MTD_OOB_PLACE:       oob data are placed at the given offset
  62  * MTD_OOB_AUTO:        oob data are automatically placed at the free areas
  63  *                      which are defined by the ecclayout
  64  * MTD_OOB_RAW:         mode to read raw data+oob in one chunk. The oob data
  65  *                      is inserted into the data. Thats a raw image of the
  66  *                      flash contents.
  67  */
  68 typedef enum {
  69         MTD_OOB_PLACE,
  70         MTD_OOB_AUTO,
  71         MTD_OOB_RAW,
  72 } mtd_oob_mode_t;
  73
  74 /**
  75  * struct mtd_oob_ops - oob operation operands
  76  * @mode:       operation mode
  77  *
  78  * @len:        number of data bytes to write/read
  79  *
  80  * @retlen:     number of data bytes written/read
  81  *
  82  * @ooblen:     number of oob bytes to write/read
  83  * @oobretlen:  number of oob bytes written/read
  84  * @ooboffs:    offset of oob data in the oob area (only relevant when
  85  *              mode = MTD_OOB_PLACE)
  86  * @datbuf:     data buffer - if NULL only oob data are read/written
  87  * @oobbuf:     oob data buffer
  88  */
  89 struct mtd_oob_ops {
  90         mtd_oob_mode_t  mode;
  91         size_t          len;
  92         size_t          retlen;
  93         size_t          ooblen;
  94         size_t          oobretlen;
  95         uint32_t        ooboffs;
  96         uint8_t         *datbuf;
  97         uint8_t         *oobbuf;
  98 };
  99
 100 struct mtd_info {
 101         u_char type;
 102         u_int32_t flags;
 103         u_int32_t size;  // Total size of the MTD
 104
 105         /* "Major" erase size for the device. Naïve users may take this
 106          * to be the only erase size available, or may use the more detailed
 107          * information below if they desire
 108          */
 109         u_int32_t erasesize;
 110         /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
 111          * though individual bits can be cleared), in case of NAND flash it is
 112          * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
 113          * it is of ECC block size, etc. It is illegal to have writesize = 0.
 114          * Any driver registering a struct mtd_info must ensure a writesize of
 115          * 1 or larger.
 116          */
 117         u_int32_t writesize;
 118
 119         u_int32_t oobsize;   // Amount of OOB data per block (e.g. 16)
 120
 121         // Kernel-only stuff starts here.
 122         char *name;
 123         int index;
 124
 125         /* ecc layout structure pointer - read only ! */
 126         struct nand_ecclayout *ecclayout;
 127
 128         /* Data for variable erase regions. If numeraseregions is zero,
 129          * it means that the whole device has erasesize as given above.
 130          */
 131         int numeraseregions;
 132         struct mtd_erase_region_info *eraseregions;
 133
 134         /* This really shouldn't be here. It can go away in 2.5 */
 135         u_int32_t bank_size;
 136
 137         int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
 138
 139         /* This stuff for eXecute-In-Place */
 140         int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
 141
 142         /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
 143         void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
 144
 145
 146         int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 147         int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 148
 149         int (*read_oob) (struct mtd_info *mtd, loff_t from,
 150                          struct mtd_oob_ops *ops);
 151         int (*write_oob) (struct mtd_info *mtd, loff_t to,
 152                          struct mtd_oob_ops *ops);
 153
 154         /*
 155          * Methods to access the protection register area, present in some
 156          * flash devices. The user data is one time programmable but the
 157          * factory data is read only.
 158          */
 159         int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 160         int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 161         int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 162         int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 163         int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 164         int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
 165
 166         /* kvec-based read/write methods.
 167            NB: The 'count' parameter is the number of _vectors_, each of
 168            which contains an (ofs, len) tuple.
 169         */
 170         int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
 171
 172         /* Sync */
 173         void (*sync) (struct mtd_info *mtd);
 174
 175         /* Chip-supported device locking */
 176         int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 177         int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 178
 179         /* Power Management functions */
 180         int (*suspend) (struct mtd_info *mtd);
 181         void (*resume) (struct mtd_info *mtd);
 182
 183         /* Bad block management functions */
 184         int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
 185         int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
 186
 187         struct notifier_block reboot_notifier;  /* default mode before reboot */
 188
 189         /* ECC status information */
 190         struct mtd_ecc_stats ecc_stats;
 191         /* Subpage shift (NAND) */
 192         int subpage_sft;
 193
 194         void *priv;
 195
 196         struct module *owner;
 197         int usecount;
 198
 199         /* If the driver is something smart, like UBI, it may need to maintain
 200          * its own reference counting. The below functions are only for driver.
 201          * The driver may register its callbacks. These callbacks are not
 202          * supposed to be called by MTD users */
 203         int (*get_device) (struct mtd_info *mtd);
 204         void (*put_device) (struct mtd_info *mtd);
 205 };
 206
 207
 208         /* Kernel-side ioctl definitions */
 209
 210 extern int add_mtd_device(struct mtd_info *mtd);
 211 extern int del_mtd_device (struct mtd_info *mtd);
 212
 213 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 214 extern struct mtd_info *get_mtd_device_nm(const char *name);
 215
 216 extern void put_mtd_device(struct mtd_info *mtd);
 217
 218
 219 struct mtd_notifier {
 220         void (*add)(struct mtd_info *mtd);
 221         void (*remove)(struct mtd_info *mtd);
 222         struct list_head list;
 223 };
 224
 225
 226 extern void register_mtd_user (struct mtd_notifier *new);
 227 extern int unregister_mtd_user (struct mtd_notifier *old);
 228
 229 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 230                        unsigned long count, loff_t to, size_t *retlen);
 231
 232 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
 233                       unsigned long count, loff_t from, size_t *retlen);
 234
 235 #ifdef CONFIG_MTD_PARTITIONS
 236 void mtd_erase_callback(struct erase_info *instr);
 237 #else
 238 static inline void mtd_erase_callback(struct erase_info *instr)
 239 {
 240         if (instr->callback)
 241                 instr->callback(instr);
 242 }
 243 #endif
 244
 245 /*
 246  * Debugging macro and defines
 247  */
 248 #define MTD_DEBUG_LEVEL0        (0)     /* Quiet   */
 249 #define MTD_DEBUG_LEVEL1        (1)     /* Audible */
 250 #define MTD_DEBUG_LEVEL2        (2)     /* Loud    */
 251 #define MTD_DEBUG_LEVEL3        (3)     /* Noisy   */
 252
 253 #ifdef CONFIG_MTD_DEBUG
 254 #define DEBUG(n, args...)                               \
 255         do {                                            \
 256                 if (n <= CONFIG_MTD_DEBUG_VERBOSE)      \
 257                         printk(KERN_INFO args);         \
 258         } while(0)
 259 #else /* CONFIG_MTD_DEBUG */
 260 #define DEBUG(n, args...) do { } while(0)
 261
 262 #endif /* CONFIG_MTD_DEBUG */
 263
 264 #endif /* __MTD_MTD_H__ */