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 * MTD_OOB_PLACE: oob data are placed at the given offset
63 * MTD_OOB_AUTO: oob data are automatically placed at the free areas
64 * which are defined by the ecclayout
65 * MTD_OOB_RAW: mode to read raw data+oob in one chunk. The oob data
66 * is inserted into the data. Thats a raw image of the
76 * struct mtd_oob_ops - oob operation operands
77 * @mode: operation mode
79 * @len: number of bytes to write/read. When a data buffer is given
80 * (datbuf != NULL) this is the number of data bytes. When
81 + no data buffer is available this is the number of oob bytes.
83 * @retlen: number of bytes written/read. When a data buffer is given
84 * (datbuf != NULL) this is the number of data bytes. When
85 + no data buffer is available this is the number of oob bytes.
87 * @ooblen: number of oob bytes per page
88 * @ooboffs: offset of oob data in the oob area (only relevant when
89 * mode = MTD_OOB_PLACE)
90 * @datbuf: data buffer - if NULL only oob data are read/written
91 * @oobbuf: oob data buffer
106 u_int32_t size; // Total size of the MTD
108 /* "Major" erase size for the device. Naïve users may take this
109 * to be the only erase size available, or may use the more detailed
110 * information below if they desire
113 /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
114 * though individual bits can be cleared), in case of NAND flash it is
115 * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
116 * it is of ECC block size, etc. It is illegal to have writesize = 0.
117 * Any driver registering a struct mtd_info must ensure a writesize of
122 u_int32_t oobsize; // Amount of OOB data per block (e.g. 16)
127 * Reuse some of the above unused fields in the case of NOR flash
128 * with configurable programming regions to avoid modifying the
129 * user visible structure layout/size. Only valid when the
130 * MTD_PROGRAM_REGIONS flag is set.
131 * (Maybe we should have an union for those?)
133 #define MTD_PROGREGION_CTRLMODE_VALID(mtd) (mtd)->oobsize
134 #define MTD_PROGREGION_CTRLMODE_INVALID(mtd) (mtd)->ecctype
136 // Kernel-only stuff starts here.
140 /* ecc layout structure pointer - read only ! */
141 struct nand_ecclayout *ecclayout;
143 /* Data for variable erase regions. If numeraseregions is zero,
144 * it means that the whole device has erasesize as given above.
147 struct mtd_erase_region_info *eraseregions;
149 /* This really shouldn't be here. It can go away in 2.5 */
152 int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
154 /* This stuff for eXecute-In-Place */
155 int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
157 /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
158 void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
161 int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
162 int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
164 int (*read_oob) (struct mtd_info *mtd, loff_t from,
165 struct mtd_oob_ops *ops);
166 int (*write_oob) (struct mtd_info *mtd, loff_t to,
167 struct mtd_oob_ops *ops);
170 * Methods to access the protection register area, present in some
171 * flash devices. The user data is one time programmable but the
172 * factory data is read only.
174 int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
175 int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
176 int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
177 int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
178 int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
179 int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
181 /* kvec-based read/write methods.
182 NB: The 'count' parameter is the number of _vectors_, each of
183 which contains an (ofs, len) tuple.
185 int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
188 void (*sync) (struct mtd_info *mtd);
190 /* Chip-supported device locking */
191 int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
192 int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
194 /* Power Management functions */
195 int (*suspend) (struct mtd_info *mtd);
196 void (*resume) (struct mtd_info *mtd);
198 /* Bad block management functions */
199 int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
200 int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
202 struct notifier_block reboot_notifier; /* default mode before reboot */
204 /* ECC status information */
205 struct mtd_ecc_stats ecc_stats;
209 struct module *owner;
214 /* Kernel-side ioctl definitions */
216 extern int add_mtd_device(struct mtd_info *mtd);
217 extern int del_mtd_device (struct mtd_info *mtd);
219 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
221 extern void put_mtd_device(struct mtd_info *mtd);
224 struct mtd_notifier {
225 void (*add)(struct mtd_info *mtd);
226 void (*remove)(struct mtd_info *mtd);
227 struct list_head list;
231 extern void register_mtd_user (struct mtd_notifier *new);
232 extern int unregister_mtd_user (struct mtd_notifier *old);
234 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
235 unsigned long count, loff_t to, size_t *retlen);
237 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
238 unsigned long count, loff_t from, size_t *retlen);
240 #ifdef CONFIG_MTD_PARTITIONS
241 void mtd_erase_callback(struct erase_info *instr);
243 static inline void mtd_erase_callback(struct erase_info *instr)
246 instr->callback(instr);
251 * Debugging macro and defines
253 #define MTD_DEBUG_LEVEL0 (0) /* Quiet */
254 #define MTD_DEBUG_LEVEL1 (1) /* Audible */
255 #define MTD_DEBUG_LEVEL2 (2) /* Loud */
256 #define MTD_DEBUG_LEVEL3 (3) /* Noisy */
258 #ifdef CONFIG_MTD_DEBUG
259 #define DEBUG(n, args...) \
261 if (n <= CONFIG_MTD_DEBUG_VERBOSE) \
262 printk(KERN_INFO args); \
264 #else /* CONFIG_MTD_DEBUG */
265 #define DEBUG(n, args...) do { } while(0)
267 #endif /* CONFIG_MTD_DEBUG */
269 #endif /* __MTD_MTD_H__ */