Commit | Line | Data |
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9fc51a37 ML |
1 | /* |
2 | * Copyright © 2009 - Maxim Levitsky | |
3 | * Common routines & support for SmartMedia/xD format | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | #include <linux/bitops.h> | |
10 | #include <linux/mtd/mtd.h> | |
11 | ||
12 | /* Full oob structure as written on the flash */ | |
13 | struct sm_oob { | |
14 | uint32_t reserved; | |
15 | uint8_t data_status; | |
16 | uint8_t block_status; | |
17 | uint8_t lba_copy1[2]; | |
18 | uint8_t ecc2[3]; | |
19 | uint8_t lba_copy2[2]; | |
20 | uint8_t ecc1[3]; | |
21 | } __attribute__((packed)); | |
22 | ||
23 | ||
24 | /* one sector is always 512 bytes, but it can consist of two nand pages */ | |
25 | #define SM_SECTOR_SIZE 512 | |
26 | ||
27 | /* oob area is also 16 bytes, but might be from two pages */ | |
28 | #define SM_OOB_SIZE 16 | |
29 | ||
30 | /* This is maximum zone size, and all devices that have more that one zone | |
31 | have this size */ | |
32 | #define SM_MAX_ZONE_SIZE 1024 | |
33 | ||
34 | /* support for small page nand */ | |
35 | #define SM_SMALL_PAGE 256 | |
36 | #define SM_SMALL_OOB_SIZE 8 | |
37 | ||
38 | ||
c3611570 | 39 | extern int sm_register_device(struct mtd_info *mtd, int smartmedia); |
9fc51a37 ML |
40 | |
41 | ||
1f6ca0d6 | 42 | static inline int sm_sector_valid(struct sm_oob *oob) |
9fc51a37 ML |
43 | { |
44 | return hweight16(oob->data_status) >= 5; | |
45 | } | |
46 | ||
1f6ca0d6 | 47 | static inline int sm_block_valid(struct sm_oob *oob) |
9fc51a37 ML |
48 | { |
49 | return hweight16(oob->block_status) >= 7; | |
50 | } | |
51 | ||
1f6ca0d6 | 52 | static inline int sm_block_erased(struct sm_oob *oob) |
9fc51a37 ML |
53 | { |
54 | static const uint32_t erased_pattern[4] = { | |
55 | 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; | |
56 | ||
57 | /* First test for erased block */ | |
58 | if (!memcmp(oob, erased_pattern, sizeof(*oob))) | |
59 | return 1; | |
60 | return 0; | |
61 | } |