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nand: Merge BCH code from Linux nand driver
[backport from linux commit 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe] This patch merges the BCH ECC algorithm from the 3.0 Linux kernel. This enables U-Boot to support modern NAND flash chips that require more than 1-bit of ECC in software. Signed-off-by: Christian Hitz <christian.hitz@aizo.com> Cc: Scott Wood <scottwood@freescale.com> Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Christian Hitz
committed by
Scott Wood
Scott Wood
parent
4d2aee2b36
commit
4c6de8560c
79
include/linux/bch.h
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79
include/linux/bch.h
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@@ -0,0 +1,79 @@
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/*
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* Generic binary BCH encoding/decoding library
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright © 2011 Parrot S.A.
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*
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* Author: Ivan Djelic <ivan.djelic@parrot.com>
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*
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* Description:
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*
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* This library provides runtime configurable encoding/decoding of binary
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* Bose-Chaudhuri-Hocquenghem (BCH) codes.
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*/
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#ifndef _BCH_H
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#define _BCH_H
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#include <linux/types.h>
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/**
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* struct bch_control - BCH control structure
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* @m: Galois field order
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* @n: maximum codeword size in bits (= 2^m-1)
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* @t: error correction capability in bits
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* @ecc_bits: ecc exact size in bits, i.e. generator polynomial degree (<=m*t)
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* @ecc_bytes: ecc max size (m*t bits) in bytes
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* @a_pow_tab: Galois field GF(2^m) exponentiation lookup table
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* @a_log_tab: Galois field GF(2^m) log lookup table
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* @mod8_tab: remainder generator polynomial lookup tables
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* @ecc_buf: ecc parity words buffer
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* @ecc_buf2: ecc parity words buffer
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* @xi_tab: GF(2^m) base for solving degree 2 polynomial roots
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* @syn: syndrome buffer
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* @cache: log-based polynomial representation buffer
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* @elp: error locator polynomial
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* @poly_2t: temporary polynomials of degree 2t
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*/
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struct bch_control {
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unsigned int m;
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unsigned int n;
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unsigned int t;
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unsigned int ecc_bits;
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unsigned int ecc_bytes;
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/* private: */
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uint16_t *a_pow_tab;
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uint16_t *a_log_tab;
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uint32_t *mod8_tab;
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uint32_t *ecc_buf;
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uint32_t *ecc_buf2;
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unsigned int *xi_tab;
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unsigned int *syn;
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int *cache;
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struct gf_poly *elp;
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struct gf_poly *poly_2t[4];
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};
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struct bch_control *init_bch(int m, int t, unsigned int prim_poly);
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void free_bch(struct bch_control *bch);
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void encode_bch(struct bch_control *bch, const uint8_t *data,
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unsigned int len, uint8_t *ecc);
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int decode_bch(struct bch_control *bch, const uint8_t *data, unsigned int len,
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const uint8_t *recv_ecc, const uint8_t *calc_ecc,
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const unsigned int *syn, unsigned int *errloc);
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#endif /* _BCH_H */
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@@ -18,13 +18,6 @@
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#ifndef __LINUX_MTD_NAND_H
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#define __LINUX_MTD_NAND_H
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/* XXX U-BOOT XXX */
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#if 0
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#include <linux/wait.h>
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#include <linux/spinlock.h>
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#include <linux/mtd/mtd.h>
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#endif
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#include "config.h"
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#include "linux/mtd/compat.h"
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@@ -132,6 +125,7 @@ typedef enum {
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NAND_ECC_HW,
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NAND_ECC_HW_SYNDROME,
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NAND_ECC_HW_OOB_FIRST,
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NAND_ECC_SOFT_BCH,
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} nand_ecc_modes_t;
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/*
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@@ -308,6 +302,7 @@ struct nand_hw_control {
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* @prepad: padding information for syndrome based ecc generators
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* @postpad: padding information for syndrome based ecc generators
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* @layout: ECC layout control struct pointer
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* @priv: pointer to private ecc control data
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* @hwctl: function to control hardware ecc generator. Must only
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* be provided if an hardware ECC is available
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* @calculate: function for ecc calculation or readback from ecc hardware
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@@ -328,6 +323,7 @@ struct nand_ecc_ctrl {
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int prepad;
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int postpad;
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struct nand_ecclayout *layout;
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void *priv;
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void (*hwctl)(struct mtd_info *mtd, int mode);
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int (*calculate)(struct mtd_info *mtd,
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const uint8_t *dat,
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72
include/linux/mtd/nand_bch.h
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72
include/linux/mtd/nand_bch.h
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/*
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* Copyright © 2011 Ivan Djelic <ivan.djelic@parrot.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This file is the header for the NAND BCH ECC implementation.
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*/
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#ifndef __MTD_NAND_BCH_H__
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#define __MTD_NAND_BCH_H__
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struct mtd_info;
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struct nand_bch_control;
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#if defined(CONFIG_NAND_ECC_BCH)
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static inline int mtd_nand_has_bch(void) { return 1; }
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/*
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* Calculate BCH ecc code
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*/
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int nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
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u_char *ecc_code);
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/*
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* Detect and correct bit errors
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*/
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int nand_bch_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc,
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u_char *calc_ecc);
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/*
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* Initialize BCH encoder/decoder
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*/
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struct nand_bch_control *
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nand_bch_init(struct mtd_info *mtd, unsigned int eccsize,
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unsigned int eccbytes, struct nand_ecclayout **ecclayout);
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/*
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* Release BCH encoder/decoder resources
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*/
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void nand_bch_free(struct nand_bch_control *nbc);
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#else /* !CONFIG_NAND_ECC_BCH */
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static inline int mtd_nand_has_bch(void) { return 0; }
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static inline int
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nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
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u_char *ecc_code)
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{
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return -1;
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}
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static inline int
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nand_bch_correct_data(struct mtd_info *mtd, unsigned char *buf,
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unsigned char *read_ecc, unsigned char *calc_ecc)
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{
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return -1;
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}
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static inline struct nand_bch_control *
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nand_bch_init(struct mtd_info *mtd, unsigned int eccsize,
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unsigned int eccbytes, struct nand_ecclayout **ecclayout)
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{
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return NULL;
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}
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static inline void nand_bch_free(struct nand_bch_control *nbc) {}
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#endif /* CONFIG_NAND_ECC_BCH */
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#endif /* __MTD_NAND_BCH_H__ */
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