2 * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <sys/mount.h>
15 #include <sys/types.h>
18 #include <asm/byteorder.h>
22 #include <mtd/mtd-user.h>
24 #include "../fs-state.h"
36 static struct driver mtd_driver
;
38 static int mtd_open(const char *mtd
, int block
)
42 int i
, ret
, flags
= O_RDWR
| O_SYNC
;
44 if ((fp
= fopen("/proc/mtd", "r"))) {
45 while (fgets(dev
, sizeof(dev
), fp
)) {
46 if (sscanf(dev
, "mtd%d:", &i
) && strstr(dev
, mtd
)) {
47 snprintf(dev
, sizeof(dev
), "/dev/mtd%s/%d", (block
? "block" : ""), i
);
48 ret
= open(dev
, flags
);
50 snprintf(dev
, sizeof(dev
), "/dev/mtd%s%d", (block
? "block" : ""), i
);
51 ret
= open(dev
, flags
);
60 return open(mtd
, flags
);
63 static void mtd_volume_close(struct volume
*v
)
65 struct mtd_priv
*p
= (struct mtd_priv
*) v
->priv
;
74 static int mtd_volume_load(struct volume
*v
)
76 struct mtd_priv
*p
= (struct mtd_priv
*) v
->priv
;
77 struct mtd_info_user mtdInfo
;
78 struct erase_info_user mtdLockInfo
;
86 p
->fd
= mtd_open(p
->chr
, 0);
89 fprintf(stderr
, "Could not open mtd device: %s\n", p
->chr
);
93 if (ioctl(p
->fd
, MEMGETINFO
, &mtdInfo
)) {
95 fprintf(stderr
, "Could not get MTD device info from %s\n", p
->chr
);
99 v
->size
= mtdInfo
.size
;
100 v
->block_size
= mtdInfo
.erasesize
;
101 switch (mtdInfo
.type
) {
112 v
->type
= UNKNOWN_TYPE
;
116 mtdLockInfo
.start
= 0;
117 mtdLockInfo
.length
= v
->size
;
118 ioctl(p
->fd
, MEMUNLOCK
, &mtdLockInfo
);
123 static char* mtd_find_index(char *name
)
125 FILE *fp
= fopen("/proc/mtd", "r");
126 static char line
[256];
132 while (!index
&& fgets(line
, sizeof(line
), fp
)) {
133 if (strstr(line
, name
)) {
134 char *eol
= strstr(line
, ":");
149 static int mtd_volume_find(struct volume
*v
, char *name
)
151 char *idx
= mtd_find_index(name
);
158 p
= calloc(1, sizeof(struct mtd_priv
));
163 v
->name
= strdup(name
);
164 v
->drv
= &mtd_driver
;
167 snprintf(buffer
, sizeof(buffer
), "/dev/mtdblock%s", idx
);
168 v
->blk
= strdup(buffer
);
170 snprintf(buffer
, sizeof(buffer
), "/dev/mtd%s", idx
);
171 p
->chr
= strdup(buffer
);
176 static int mtd_volume_identify(struct volume
*v
)
178 struct mtd_priv
*p
= (struct mtd_priv
*) v
->priv
;
183 if (mtd_volume_load(v
)) {
184 fprintf(stderr
, "reading %s failed\n", v
->name
);
188 sz
= read(p
->fd
, &deadc0de
, sizeof(deadc0de
));
190 if (sz
!= sizeof(deadc0de
)) {
191 fprintf(stderr
, "reading %s failed: %s\n", v
->name
, strerror(errno
));
195 if (deadc0de
== 0x4f575254)
198 deadc0de
= __be32_to_cpu(deadc0de
);
199 if (deadc0de
== 0xdeadc0de) {
200 fprintf(stderr
, "jffs2 is not ready - marker found\n");
204 jffs2
= __be16_to_cpu(deadc0de
>> 16);
205 if (jffs2
== 0x1985) {
206 fprintf(stderr
, "jffs2 is ready\n");
210 if (v
->type
== UBIVOLUME
&& deadc0de
== 0xffffffff) {
211 fprintf(stderr
, "jffs2 is ready\n");
215 fprintf(stderr
, "No jffs2 marker was found\n");
220 static int mtd_volume_erase(struct volume
*v
, int offset
, int len
)
222 struct mtd_priv
*p
= (struct mtd_priv
*) v
->priv
;
223 struct erase_info_user eiu
;
224 int first_block
, num_blocks
;
226 if (mtd_volume_load(v
))
229 if (offset
% v
->block_size
|| len
% v
->block_size
) {
230 fprintf(stderr
, "mtd erase needs to be block aligned\n");
234 first_block
= offset
/ v
->block_size
;
235 num_blocks
= len
/ v
->block_size
;
236 eiu
.length
= v
->block_size
;
238 for (eiu
.start
= first_block
* v
->block_size
;
239 eiu
.start
< v
->size
&& eiu
.start
< (first_block
+ num_blocks
) * v
->block_size
;
240 eiu
.start
+= v
->block_size
) {
241 fprintf(stderr
, "erasing %x %x\n", eiu
.start
, v
->block_size
);
242 ioctl(p
->fd
, MEMUNLOCK
, &eiu
);
243 if (ioctl(p
->fd
, MEMERASE
, &eiu
))
244 fprintf(stderr
, "Failed to erase block at 0x%x\n", eiu
.start
);
252 static int mtd_volume_erase_all(struct volume
*v
)
254 mtd_volume_erase(v
, 0, v
->size
);
260 static int mtd_volume_init(struct volume
*v
)
262 struct mtd_priv
*p
= (struct mtd_priv
*) v
->priv
;
263 struct mtd_info_user mtdinfo
;
266 if (mtd_volume_load(v
))
269 ret
= ioctl(p
->fd
, MEMGETINFO
, &mtdinfo
);
271 fprintf(stderr
, "ioctl(%d, MEMGETINFO) failed: %s\n", p
->fd
, strerror(errno
));
273 struct erase_info_user mtdlock
;
276 mtdlock
.length
= mtdinfo
.size
;
277 ioctl(p
->fd
, MEMUNLOCK
, &mtdlock
);
283 static int mtd_volume_read(struct volume
*v
, void *buf
, int offset
, int length
)
285 struct mtd_priv
*p
= (struct mtd_priv
*) v
->priv
;
287 if (mtd_volume_load(v
))
290 if (lseek(p
->fd
, offset
, SEEK_SET
) == (off_t
) -1) {
291 fprintf(stderr
, "lseek/read failed\n");
295 if (read(p
->fd
, buf
, length
) == -1) {
296 fprintf(stderr
, "read failed\n");
303 static int mtd_volume_write(struct volume
*v
, void *buf
, int offset
, int length
)
305 struct mtd_priv
*p
= (struct mtd_priv
*) v
->priv
;
307 if (mtd_volume_load(v
))
310 if (lseek(p
->fd
, offset
, SEEK_SET
) == (off_t
) -1) {
311 fprintf(stderr
, "lseek/write failed at offset %d\n", offset
);
316 if (write(p
->fd
, buf
, length
) == -1) {
317 fprintf(stderr
, "write failed\n");
324 static struct driver mtd_driver
= {
326 .find
= mtd_volume_find
,
327 .init
= mtd_volume_init
,
328 .erase
= mtd_volume_erase
,
329 .erase_all
= mtd_volume_erase_all
,
330 .read
= mtd_volume_read
,
331 .write
= mtd_volume_write
,
332 .identify
= mtd_volume_identify
,