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58 lines
1.3 KiB
58 lines
1.3 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright © 2009 - Maxim Levitsky |
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* Common routines & support for SmartMedia/xD format |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/mtd/mtd.h> |
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/* Full oob structure as written on the flash */ |
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struct sm_oob { |
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uint32_t reserved; |
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uint8_t data_status; |
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uint8_t block_status; |
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uint8_t lba_copy1[2]; |
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uint8_t ecc2[3]; |
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uint8_t lba_copy2[2]; |
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uint8_t ecc1[3]; |
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} __packed; |
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/* one sector is always 512 bytes, but it can consist of two nand pages */ |
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#define SM_SECTOR_SIZE 512 |
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/* oob area is also 16 bytes, but might be from two pages */ |
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#define SM_OOB_SIZE 16 |
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/* This is maximum zone size, and all devices that have more that one zone |
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have this size */ |
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#define SM_MAX_ZONE_SIZE 1024 |
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/* support for small page nand */ |
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#define SM_SMALL_PAGE 256 |
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#define SM_SMALL_OOB_SIZE 8 |
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int sm_register_device(struct mtd_info *mtd, int smartmedia); |
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static inline int sm_sector_valid(struct sm_oob *oob) |
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{ |
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return hweight16(oob->data_status) >= 5; |
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} |
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static inline int sm_block_valid(struct sm_oob *oob) |
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{ |
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return hweight16(oob->block_status) >= 7; |
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} |
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static inline int sm_block_erased(struct sm_oob *oob) |
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{ |
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static const uint32_t erased_pattern[4] = { |
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0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; |
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/* First test for erased block */ |
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if (!memcmp(oob, erased_pattern, sizeof(*oob))) |
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return 1; |
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return 0; |
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}
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