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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Copyright (C) 2000-2010 Steven J. Hill <sjhill@realitydiluted.com>4 * David Woodhouse <dwmw2@infradead.org>5 * Thomas Gleixner <tglx@linutronix.de>6 *7 * This file is the header for the NAND Hamming ECC implementation.8 */9 10#ifndef __MTD_NAND_ECC_SW_HAMMING_H__11#define __MTD_NAND_ECC_SW_HAMMING_H__12 13#include <linux/mtd/nand.h>14 15/**16 * struct nand_ecc_sw_hamming_conf - private software Hamming ECC engine structure17 * @req_ctx: Save request context and tweak the original request to fit the18 * engine needs19 * @code_size: Number of bytes needed to store a code (one code per step)20 * @calc_buf: Buffer to use when calculating ECC bytes21 * @code_buf: Buffer to use when reading (raw) ECC bytes from the chip22 * @sm_order: Smart Media special ordering23 */24struct nand_ecc_sw_hamming_conf {25 struct nand_ecc_req_tweak_ctx req_ctx;26 unsigned int code_size;27 u8 *calc_buf;28 u8 *code_buf;29 unsigned int sm_order;30};31 32#if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING)33 34int nand_ecc_sw_hamming_init_ctx(struct nand_device *nand);35void nand_ecc_sw_hamming_cleanup_ctx(struct nand_device *nand);36int ecc_sw_hamming_calculate(const unsigned char *buf, unsigned int step_size,37 unsigned char *code, bool sm_order);38int nand_ecc_sw_hamming_calculate(struct nand_device *nand,39 const unsigned char *buf,40 unsigned char *code);41int ecc_sw_hamming_correct(unsigned char *buf, unsigned char *read_ecc,42 unsigned char *calc_ecc, unsigned int step_size,43 bool sm_order);44int nand_ecc_sw_hamming_correct(struct nand_device *nand, unsigned char *buf,45 unsigned char *read_ecc,46 unsigned char *calc_ecc);47 48#else /* !CONFIG_MTD_NAND_ECC_SW_HAMMING */49 50static inline int nand_ecc_sw_hamming_init_ctx(struct nand_device *nand)51{52 return -ENOTSUPP;53}54 55static inline void nand_ecc_sw_hamming_cleanup_ctx(struct nand_device *nand) {}56 57static inline int ecc_sw_hamming_calculate(const unsigned char *buf,58 unsigned int step_size,59 unsigned char *code, bool sm_order)60{61 return -ENOTSUPP;62}63 64static inline int nand_ecc_sw_hamming_calculate(struct nand_device *nand,65 const unsigned char *buf,66 unsigned char *code)67{68 return -ENOTSUPP;69}70 71static inline int ecc_sw_hamming_correct(unsigned char *buf,72 unsigned char *read_ecc,73 unsigned char *calc_ecc,74 unsigned int step_size, bool sm_order)75{76 return -ENOTSUPP;77}78 79static inline int nand_ecc_sw_hamming_correct(struct nand_device *nand,80 unsigned char *buf,81 unsigned char *read_ecc,82 unsigned char *calc_ecc)83{84 return -ENOTSUPP;85}86 87#endif /* CONFIG_MTD_NAND_ECC_SW_HAMMING */88 89#endif /* __MTD_NAND_ECC_SW_HAMMING_H__ */90