1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Copyright © 2010 - Maxim Levitsky
4 *
5 * mtd_probe is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * mtd_probe is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with mtd_probe; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301 USA
19 */
20
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <mtd/mtd-user.h>
24 #include <stdint.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <sys/stat.h>
29 #include <sys/types.h>
30 #include <unistd.h>
31
32 #include "alloc-util.h"
33 #include "mtd_probe.h"
34
35 static const uint8_t cis_signature[] = {
36 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
37 };
38
probe_smart_media(int mtd_fd,mtd_info_t * info)39 int probe_smart_media(int mtd_fd, mtd_info_t* info) {
40 int sector_size;
41 int block_size;
42 int size_in_megs;
43 int spare_count;
44 _cleanup_free_ uint8_t *cis_buffer = NULL;
45 int offset;
46 int cis_found = 0;
47
48 cis_buffer = malloc(SM_SECTOR_SIZE);
49 if (!cis_buffer)
50 return log_oom();
51
52 if (info->type != MTD_NANDFLASH)
53 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
54 "Not marked MTD_NANDFLASH.");
55
56 sector_size = info->writesize;
57 block_size = info->erasesize;
58 size_in_megs = info->size / (1024 * 1024);
59
60 if (!IN_SET(sector_size, SM_SECTOR_SIZE, SM_SMALL_PAGE))
61 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
62 "Unexpected sector size: %i", sector_size);
63
64 switch (size_in_megs) {
65 case 1:
66 case 2:
67 spare_count = 6;
68 break;
69 case 4:
70 spare_count = 12;
71 break;
72 default:
73 spare_count = 24;
74 break;
75 }
76
77 for (offset = 0; offset < block_size * spare_count; offset += sector_size) {
78 (void) lseek(mtd_fd, SEEK_SET, offset);
79
80 if (read(mtd_fd, cis_buffer, SM_SECTOR_SIZE) == SM_SECTOR_SIZE) {
81 cis_found = 1;
82 break;
83 }
84 }
85
86 if (!cis_found)
87 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
88 "CIS not found");
89
90 if (memcmp(cis_buffer, cis_signature, sizeof(cis_signature)) != 0 &&
91 memcmp(cis_buffer + SM_SMALL_PAGE, cis_signature, sizeof(cis_signature)) != 0)
92 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
93 "CIS signature didn't match");
94
95 printf("MTD_FTL=smartmedia\n");
96 return 0;
97 }
98