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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
* @req_ctx: Save request context and tweak the original request to fit the
* engine needs
* @code_size: Number of bytes needed to store a code (one code per step)
* @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 {
struct nand_ecc_req_tweak_ctx req_ctx;
unsigned int code_size;
u8 *calc_buf;
u8 *code_buf;
unsigned int sm_order;
};
#if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING)
int nand_ecc_sw_hamming_init_ctx(struct nand_device *nand);
void nand_ecc_sw_hamming_cleanup_ctx(struct nand_device *nand);
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);
#else /* !CONFIG_MTD_NAND_ECC_SW_HAMMING */
static inline int nand_ecc_sw_hamming_init_ctx(struct nand_device *nand)
{
return -ENOTSUPP;
}
static inline void nand_ecc_sw_hamming_cleanup_ctx(struct nand_device *nand) {}
static inline int ecc_sw_hamming_calculate(const unsigned char *buf,
unsigned int step_size,
unsigned char *code, bool sm_order)
{
return -ENOTSUPP;
}
static inline int nand_ecc_sw_hamming_calculate(struct nand_device *nand,
const unsigned char *buf,
unsigned char *code)
{
return -ENOTSUPP;
}
static inline int ecc_sw_hamming_correct(unsigned char *buf,
unsigned char *read_ecc,
unsigned char *calc_ecc,
unsigned int step_size, bool sm_order)
{
return -ENOTSUPP;
}
static inline int nand_ecc_sw_hamming_correct(struct nand_device *nand,
unsigned char *buf,
unsigned char *read_ecc,
unsigned char *calc_ecc)
{
return -ENOTSUPP;
}
#endif /* CONFIG_MTD_NAND_ECC_SW_HAMMING */
#endif /* __MTD_NAND_ECC_SW_HAMMING_H__ */
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