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https://github.com/torvalds/linux
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61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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extern 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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