| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * Copyright © 2009 - Maxim Levitsky |
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| 4 | * Common routines & support for SmartMedia/xD format |
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| 5 | */ |
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| 6 | #include <linux/bitops.h> |
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| 7 | #include <linux/mtd/mtd.h> |
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| 8 | |
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| 9 | /* Full oob structure as written on the flash */ |
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| 10 | struct sm_oob { |
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| 11 | uint32_t reserved; |
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| 12 | uint8_t data_status; |
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| 13 | uint8_t block_status; |
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| 14 | uint8_t lba_copy1[2]; |
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| 15 | uint8_t ecc2[3]; |
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| 16 | uint8_t lba_copy2[2]; |
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| 17 | uint8_t ecc1[3]; |
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| 18 | } __packed; |
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| 19 | |
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| 20 | |
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| 21 | /* one sector is always 512 bytes, but it can consist of two nand pages */ |
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| 22 | #define SM_SECTOR_SIZE 512 |
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| 23 | |
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| 24 | /* oob area is also 16 bytes, but might be from two pages */ |
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| 25 | #define SM_OOB_SIZE 16 |
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| 26 | |
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| 27 | /* This is maximum zone size, and all devices that have more that one zone |
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| 28 | have this size */ |
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| 29 | #define SM_MAX_ZONE_SIZE 1024 |
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| 30 | |
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| 31 | /* support for small page nand */ |
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| 32 | #define SM_SMALL_PAGE 256 |
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| 33 | #define SM_SMALL_OOB_SIZE 8 |
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| 34 | |
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| 35 | |
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| 36 | int sm_register_device(struct mtd_info *mtd, int smartmedia); |
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| 37 | |
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| 38 | |
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| 39 | static inline int sm_sector_valid(struct sm_oob *oob) |
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| 40 | { |
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| 41 | return hweight16(oob->data_status) >= 5; |
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| 42 | } |
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| 43 | |
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| 44 | static inline int sm_block_valid(struct sm_oob *oob) |
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| 45 | { |
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| 46 | return hweight16(oob->block_status) >= 7; |
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| 47 | } |
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| 48 | |
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| 49 | static inline int sm_block_erased(struct sm_oob *oob) |
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| 50 | { |
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| 51 | static const uint32_t erased_pattern[4] = { |
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| 52 | 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; |
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| 53 | |
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| 54 | /* First test for erased block */ |
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| 55 | if (!memcmp(p: oob, q: erased_pattern, size: sizeof(*oob))) |
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| 56 | return 1; |
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| 57 | return 0; |
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| 58 | } |
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| 59 | |
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