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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright © 2011 Ivan Djelic <ivan.djelic@parrot.com>
*
* This file is the header for the NAND BCH ECC implementation.
*/
#ifndef __MTD_NAND_ECC_SW_BCH_H__
#define __MTD_NAND_ECC_SW_BCH_H__
#include <linux/mtd/nand.h>
#include <linux/bch.h>
/**
* struct nand_ecc_sw_bch_conf - private software BCH 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)
* @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
* @bch: BCH control structure
* @errloc: error location array
* @eccmask: XOR ecc mask, allows erased pages to be decoded as valid
*/
struct nand_ecc_sw_bch_conf {
struct nand_ecc_req_tweak_ctx req_ctx;
unsigned int code_size;
unsigned int nsteps;
u8 *calc_buf;
u8 *code_buf;
struct bch_control *bch;
unsigned int *errloc;
unsigned char *eccmask;
};
#if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_BCH)
int nand_ecc_sw_bch_calculate(struct nand_device *nand,
const unsigned char *buf, unsigned char *code);
int nand_ecc_sw_bch_correct(struct nand_device *nand, unsigned char *buf,
unsigned char *read_ecc, unsigned char *calc_ecc);
int nand_ecc_sw_bch_init_ctx(struct nand_device *nand);
void nand_ecc_sw_bch_cleanup_ctx(struct nand_device *nand);
struct nand_ecc_engine *nand_ecc_sw_bch_get_engine(void);
#else /* !CONFIG_MTD_NAND_ECC_SW_BCH */
static inline int nand_ecc_sw_bch_calculate(struct nand_device *nand,
const unsigned char *buf,
unsigned char *code)
{
return -ENOTSUPP;
}
static inline int nand_ecc_sw_bch_correct(struct nand_device *nand,
unsigned char *buf,
unsigned char *read_ecc,
unsigned char *calc_ecc)
{
return -ENOTSUPP;
}
static inline int nand_ecc_sw_bch_init_ctx(struct nand_device *nand)
{
return -ENOTSUPP;
}
static inline void nand_ecc_sw_bch_cleanup_ctx(struct nand_device *nand) {}
#endif /* CONFIG_MTD_NAND_ECC_SW_BCH */
#endif /* __MTD_NAND_ECC_SW_BCH_H__ */
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