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 */
62 u_int32_t size; // Total size of the MTD
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
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
75 u_int32_t oobsize; // Amount of OOB data per block (e.g. 16)
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?)
86 #define MTD_PROGREGION_CTRLMODE_VALID(mtd) (mtd)->oobsize
87 #define MTD_PROGREGION_CTRLMODE_INVALID(mtd) (mtd)->ecctype
89 // Kernel-only stuff starts here.
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
97 /* Data for variable erase regions. If numeraseregions is zero,
98 * it means that the whole device has erasesize as given above.
101 struct mtd_erase_region_info *eraseregions;
103 /* This really shouldn't be here. It can go away in 2.5 */
106 int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
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);
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);
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);
118 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);
119 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);
121 int (*read_oob) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
122 int (*write_oob) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
125 * Methods to access the protection register area, present in some
126 * flash devices. The user data is one time programmable but the
127 * factory data is read only.
129 int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
130 int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
131 int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
132 int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
133 int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
134 int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
136 /* kvec-based read/write methods. We need these especially for NAND flash,
137 with its limited number of write cycles per erase.
138 NB: The 'count' parameter is the number of _vectors_, each of
139 which contains an (ofs, len) tuple.
141 int (*readv) (struct mtd_info *mtd, struct kvec *vecs, unsigned long count, loff_t from, size_t *retlen);
142 int (*readv_ecc) (struct mtd_info *mtd, struct kvec *vecs, unsigned long count, loff_t from,
143 size_t *retlen, u_char *eccbuf, struct nand_oobinfo *oobsel);
144 int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
147 void (*sync) (struct mtd_info *mtd);
149 /* Chip-supported device locking */
150 int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
151 int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
153 /* Power Management functions */
154 int (*suspend) (struct mtd_info *mtd);
155 void (*resume) (struct mtd_info *mtd);
157 /* Bad block management functions */
158 int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
159 int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
161 struct notifier_block reboot_notifier; /* default mode before reboot */
165 struct module *owner;
170 /* Kernel-side ioctl definitions */
172 extern int add_mtd_device(struct mtd_info *mtd);
173 extern int del_mtd_device (struct mtd_info *mtd);
175 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
177 extern void put_mtd_device(struct mtd_info *mtd);
180 struct mtd_notifier {
181 void (*add)(struct mtd_info *mtd);
182 void (*remove)(struct mtd_info *mtd);
183 struct list_head list;
187 extern void register_mtd_user (struct mtd_notifier *new);
188 extern int unregister_mtd_user (struct mtd_notifier *old);
190 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
191 unsigned long count, loff_t to, size_t *retlen);
193 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
194 unsigned long count, loff_t from, size_t *retlen);
196 #define MTD_ERASE(mtd, args...) (*(mtd->erase))(mtd, args)
197 #define MTD_POINT(mtd, a,b,c,d) (*(mtd->point))(mtd, a,b,c, (u_char **)(d))
198 #define MTD_UNPOINT(mtd, arg) (*(mtd->unpoint))(mtd, (u_char *)arg)
199 #define MTD_READ(mtd, args...) (*(mtd->read))(mtd, args)
200 #define MTD_WRITE(mtd, args...) (*(mtd->write))(mtd, args)
201 #define MTD_READV(mtd, args...) (*(mtd->readv))(mtd, args)
202 #define MTD_WRITEV(mtd, args...) (*(mtd->writev))(mtd, args)
203 #define MTD_READECC(mtd, args...) (*(mtd->read_ecc))(mtd, args)
204 #define MTD_WRITEECC(mtd, args...) (*(mtd->write_ecc))(mtd, args)
205 #define MTD_READOOB(mtd, args...) (*(mtd->read_oob))(mtd, args)
206 #define MTD_WRITEOOB(mtd, args...) (*(mtd->write_oob))(mtd, args)
207 #define MTD_SYNC(mtd) do { if (mtd->sync) (*(mtd->sync))(mtd); } while (0)
210 #ifdef CONFIG_MTD_PARTITIONS
211 void mtd_erase_callback(struct erase_info *instr);
213 static inline void mtd_erase_callback(struct erase_info *instr)
216 instr->callback(instr);
221 * Debugging macro and defines
223 #define MTD_DEBUG_LEVEL0 (0) /* Quiet */
224 #define MTD_DEBUG_LEVEL1 (1) /* Audible */
225 #define MTD_DEBUG_LEVEL2 (2) /* Loud */
226 #define MTD_DEBUG_LEVEL3 (3) /* Noisy */
228 #ifdef CONFIG_MTD_DEBUG
229 #define DEBUG(n, args...) \
231 if (n <= CONFIG_MTD_DEBUG_VERBOSE) \
232 printk(KERN_INFO args); \
234 #else /* CONFIG_MTD_DEBUG */
235 #define DEBUG(n, args...) do { } while(0)
237 #endif /* CONFIG_MTD_DEBUG */
239 #endif /* __MTD_MTD_H__ */