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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2000-2010 Steven J. Hill <sjhill@realitydiluted.com>
* David Woodhouse <dwmw2@infradead.org>
* Thomas Gleixner <tglx@linutronix.de>
*
* This file is the header for the NAND Hamming ECC implementation.
*/
#ifndef __MTD_NAND_ECC_SW_HAMMING_H__
#define __MTD_NAND_ECC_SW_HAMMING_H__
#include <linux/mtd/nand.h>
/**
* struct nand_ecc_sw_hamming_conf - private software Hamming ECC engine structure
* @reqooblen: Save the actual user OOB length requested before overwriting it
* @spare_oobbuf: Spare OOB buffer if none is provided
* @code_size: Number of bytes needed to store a code (one code per step)
* @nsteps: Number of steps
* @calc_buf: Buffer to use when calculating ECC bytes
* @code_buf: Buffer to use when reading (raw) ECC bytes from the chip
* @sm_order: Smart Media special ordering
*/
struct nand_ecc_sw_hamming_conf {
unsigned int reqooblen;
void *spare_oobbuf;
unsigned int code_size;
unsigned int nsteps;
u8 *calc_buf;
u8 *code_buf;
unsigned int sm_order;
};
int ecc_sw_hamming_calculate(const unsigned char *buf, unsigned int step_size,
unsigned char *code, bool sm_order);
int nand_ecc_sw_hamming_calculate(struct nand_device *nand,
const unsigned char *buf,
unsigned char *code);
int ecc_sw_hamming_correct(unsigned char *buf, unsigned char *read_ecc,
unsigned char *calc_ecc, unsigned int step_size,
bool sm_order);
int nand_ecc_sw_hamming_correct(struct nand_device *nand, unsigned char *buf,
unsigned char *read_ecc,
unsigned char *calc_ecc);
#endif /* __MTD_NAND_ECC_SW_HAMMING_H__ */
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