2 * $Id: mtd.h,v 1.61 2005/11/07 11:14:54 gleixner Exp $
4 * Copyright (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> et al.
13 #error This is a kernel header. Perhaps include mtd-user.h instead?
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>
22 #include <linux/mtd/compatmac.h>
23 #include <mtd/mtd-abi.h>
25 #define MTD_CHAR_MAJOR 90
26 #define MTD_BLOCK_MAJOR 31
27 #define MAX_MTD_DEVICES 16
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
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. */
47 void (*callback) (struct erase_info *self);
50 struct erase_info *next;
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 */
60 * struct mtd_ecc_stats - error correction status
62 * @corrected: number of corrected bits
63 * @failed: number of uncorrectable errors
65 struct mtd_ecc_stats {
66 unsigned long corrected;
73 u_int32_t size; // Total size of the MTD
75 /* "Major" erase size for the device. Naïve users may take this
76 * to be the only erase size available, or may use the more detailed
77 * information below if they desire
80 /* Smallest availlable size for writing to the device. For NAND,
81 * this is the page size, for some NOR chips, the size of ECC
86 u_int32_t oobsize; // Amount of OOB data per block (e.g. 16)
91 * Reuse some of the above unused fields in the case of NOR flash
92 * with configurable programming regions to avoid modifying the
93 * user visible structure layout/size. Only valid when the
94 * MTD_PROGRAM_REGIONS flag is set.
95 * (Maybe we should have an union for those?)
97 #define MTD_PROGREGION_CTRLMODE_VALID(mtd) (mtd)->oobsize
98 #define MTD_PROGREGION_CTRLMODE_INVALID(mtd) (mtd)->ecctype
100 // Kernel-only stuff starts here.
104 // oobinfo is a nand_oobinfo structure, which can be set by iotcl (MEMSETOOBINFO)
105 struct nand_oobinfo oobinfo;
106 u_int32_t oobavail; // Number of bytes in OOB area available for fs
108 /* Data for variable erase regions. If numeraseregions is zero,
109 * it means that the whole device has erasesize as given above.
112 struct mtd_erase_region_info *eraseregions;
114 /* This really shouldn't be here. It can go away in 2.5 */
117 int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
119 /* This stuff for eXecute-In-Place */
120 int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
122 /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
123 void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
126 int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
127 int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
129 int (*read_oob) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
130 int (*write_oob) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
133 * Methods to access the protection register area, present in some
134 * flash devices. The user data is one time programmable but the
135 * factory data is read only.
137 int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
138 int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
139 int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
140 int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
141 int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
142 int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
144 /* kvec-based read/write methods.
145 NB: The 'count' parameter is the number of _vectors_, each of
146 which contains an (ofs, len) tuple.
148 int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
151 void (*sync) (struct mtd_info *mtd);
153 /* Chip-supported device locking */
154 int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
155 int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
157 /* Power Management functions */
158 int (*suspend) (struct mtd_info *mtd);
159 void (*resume) (struct mtd_info *mtd);
161 /* Bad block management functions */
162 int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
163 int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
165 struct notifier_block reboot_notifier; /* default mode before reboot */
167 /* ECC status information */
168 struct mtd_ecc_stats ecc_stats;
172 struct module *owner;
177 /* Kernel-side ioctl definitions */
179 extern int add_mtd_device(struct mtd_info *mtd);
180 extern int del_mtd_device (struct mtd_info *mtd);
182 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
184 extern void put_mtd_device(struct mtd_info *mtd);
187 struct mtd_notifier {
188 void (*add)(struct mtd_info *mtd);
189 void (*remove)(struct mtd_info *mtd);
190 struct list_head list;
194 extern void register_mtd_user (struct mtd_notifier *new);
195 extern int unregister_mtd_user (struct mtd_notifier *old);
197 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
198 unsigned long count, loff_t to, size_t *retlen);
200 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
201 unsigned long count, loff_t from, size_t *retlen);
203 #define MTD_ERASE(mtd, args...) (*(mtd->erase))(mtd, args)
204 #define MTD_POINT(mtd, a,b,c,d) (*(mtd->point))(mtd, a,b,c, (u_char **)(d))
205 #define MTD_UNPOINT(mtd, arg) (*(mtd->unpoint))(mtd, (u_char *)arg)
206 #define MTD_READ(mtd, args...) (*(mtd->read))(mtd, args)
207 #define MTD_WRITE(mtd, args...) (*(mtd->write))(mtd, args)
208 #define MTD_READV(mtd, args...) (*(mtd->readv))(mtd, args)
209 #define MTD_WRITEV(mtd, args...) (*(mtd->writev))(mtd, args)
210 #define MTD_READECC(mtd, args...) (*(mtd->read_ecc))(mtd, args)
211 #define MTD_WRITEECC(mtd, args...) (*(mtd->write_ecc))(mtd, args)
212 #define MTD_READOOB(mtd, args...) (*(mtd->read_oob))(mtd, args)
213 #define MTD_WRITEOOB(mtd, args...) (*(mtd->write_oob))(mtd, args)
214 #define MTD_SYNC(mtd) do { if (mtd->sync) (*(mtd->sync))(mtd); } while (0)
217 #ifdef CONFIG_MTD_PARTITIONS
218 void mtd_erase_callback(struct erase_info *instr);
220 static inline void mtd_erase_callback(struct erase_info *instr)
223 instr->callback(instr);
228 * Debugging macro and defines
230 #define MTD_DEBUG_LEVEL0 (0) /* Quiet */
231 #define MTD_DEBUG_LEVEL1 (1) /* Audible */
232 #define MTD_DEBUG_LEVEL2 (2) /* Loud */
233 #define MTD_DEBUG_LEVEL3 (3) /* Noisy */
235 #ifdef CONFIG_MTD_DEBUG
236 #define DEBUG(n, args...) \
238 if (n <= CONFIG_MTD_DEBUG_VERBOSE) \
239 printk(KERN_INFO args); \
241 #else /* CONFIG_MTD_DEBUG */
242 #define DEBUG(n, args...) do { } while(0)
244 #endif /* CONFIG_MTD_DEBUG */
246 #endif /* __MTD_MTD_H__ */