1 /*
2 * Copyright (C) 2010 - Maxim Levitsky
3 *
4 * mtd_probe is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * mtd_probe is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with mtd_probe; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301 USA
18 */
19
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <mtd/mtd-user.h>
23 #include <string.h>
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <fcntl.h>
27 #include <unistd.h>
28 #include <stdint.h>
29 #include "mtd_probe.h"
30
31 static const uint8_t cis_signature[] = {
32 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
33 };
34
35
probe_smart_media(int mtd_fd,mtd_info_t * info)36 void probe_smart_media(int mtd_fd, mtd_info_t* info)
37 {
38 int sector_size;
39 int block_size;
40 int size_in_megs;
41 int spare_count;
42 char* cis_buffer = malloc(SM_SECTOR_SIZE);
43 int offset;
44 int cis_found = 0;
45
46 if (!cis_buffer)
47 return;
48
49 if (info->type != MTD_NANDFLASH)
50 goto exit;
51
52 sector_size = info->writesize;
53 block_size = info->erasesize;
54 size_in_megs = info->size / (1024 * 1024);
55
56 if (sector_size != SM_SECTOR_SIZE && sector_size != SM_SMALL_PAGE)
57 goto exit;
58
59 switch(size_in_megs) {
60 case 1:
61 case 2:
62 spare_count = 6;
63 break;
64 case 4:
65 spare_count = 12;
66 break;
67 default:
68 spare_count = 24;
69 break;
70 }
71
72 for (offset = 0 ; offset < block_size * spare_count ;
73 offset += sector_size) {
74 lseek(mtd_fd, SEEK_SET, offset);
75 if (read(mtd_fd, cis_buffer, SM_SECTOR_SIZE) == SM_SECTOR_SIZE){
76 cis_found = 1;
77 break;
78 }
79 }
80
81 if (!cis_found)
82 goto exit;
83
84 if (memcmp(cis_buffer, cis_signature, sizeof(cis_signature)) != 0 &&
85 (memcmp(cis_buffer + SM_SMALL_PAGE, cis_signature,
86 sizeof(cis_signature)) != 0))
87 goto exit;
88
89 printf("MTD_FTL=smartmedia\n");
90 free(cis_buffer);
91 exit(0);
92 exit:
93 free(cis_buffer);
94 return;
95 }
96