forked from luck/tmp_suning_uos_patched
d2912cb15b
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
/* 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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