80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
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/*******************************************************************************
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Filename: new_rs.h
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Description: Global definitions for Reed-Solomon encoder/decoder
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Author: STMicroelectronics
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You have a license to reproduce, display, perform, produce derivative works of,
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and distribute (in original or modified form) the Program, provided that you
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explicitly agree to the following disclaimer:
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THIS PROGRAM IS PROVIDED "AS IT IS" WITHOUT WARRANTY OF ANY KIND, EITHER
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EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTY
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK
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AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
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PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
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REPAIR OR CORRECTION.
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********************************************************************************/
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#ifndef __MTD_NAND_ECC_RS_H__
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#define __MTD_NAND_ECC_RS_H__
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#include <common.h>
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//typedef unsigned int dtype;
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typedef u_short dtype;
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/* Initialization function */
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void init_rs(void);
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/* These two functions *must* be called in this order (e.g.,
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* by init_rs()) before any encoding/decoding
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*/
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void generate_gf(void); /* Generate Galois Field */
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void gen_poly(void); /* Generate generator polynomial */
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/* Reed-Solomon encoding
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* data[] is the input block, parity symbols are placed in bb[]
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* bb[] may lie past the end of the data, e.g., for (255,223):
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* encode_rs(&data[0],&data[223]);
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*/
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char encode_rs(dtype data[], dtype bb[]);
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/* Reed-Solomon errors decoding
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* The received block goes into data[]
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*
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* The decoder corrects the symbols in place, if possible and returns
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* the number of corrected symbols. If the codeword is illegal or
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* uncorrectible, the data array is unchanged and -1 is returned
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*/
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int decode_rs(dtype data[]);
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/**
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* nand_calculate_ecc - [NAND Interface] Calculate 3 byte ECC code for 256 byte block
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* @mtd: MTD block structure
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* @dat: raw data
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* @ecc_code: buffer for ECC
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*/
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int nand_calculate_ecc_rs(struct mtd_info *mtd, const u_char *data, u_char *ecc_code);
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/**
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* nand_correct_data - [NAND Interface] Detect and correct bit error(s)
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* @mtd: MTD block structure
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* @dat: raw data read from the chip
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* @store_ecc: ECC from the chip
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* @calc_ecc: the ECC calculated from raw data
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*
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* Detect and correct a 1 bit error for 256 byte block
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*/
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int nand_correct_data_rs(struct mtd_info *mtd, u_char *data, u_char *store_ecc, u_char *calc_ecc);
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#endif
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