projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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]; | |
| 31f75462 | 21 | } __packed; |
| 9fc51a37 ML |
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 | } |