205 lines
6.0 KiB
C
205 lines
6.0 KiB
C
/*
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* calculate ecc code for nand flash
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*
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* Copyright (C) 2008 yajin <yajin@vm-kernel.org>
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* Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 or
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* (at your option) version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <stdio.h>
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#define DEF_NAND_PAGE_SIZE 2048
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#define DEF_NAND_OOB_SIZE 64
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#define DEF_NAND_ECC_OFFSET 0x28
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static int page_size = DEF_NAND_PAGE_SIZE;
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static int oob_size = DEF_NAND_OOB_SIZE;
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static int ecc_offset = DEF_NAND_ECC_OFFSET;
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/*
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* Pre-calculated 256-way 1 byte column parity
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*/
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static const uint8_t nand_ecc_precalc_table[] = {
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0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00,
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0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65,
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0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66,
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0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03,
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0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69,
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0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c,
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0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f,
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0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a,
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0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a,
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0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f,
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0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c,
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0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69,
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0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03,
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0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66,
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0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65,
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0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00
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};
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/**
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* nand_calculate_ecc - [NAND Interface] Calculate 3-byte ECC for 256-byte block
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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(const uint8_t *dat,
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uint8_t *ecc_code)
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{
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uint8_t idx, reg1, reg2, reg3, tmp1, tmp2;
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int i;
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/* Initialize variables */
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reg1 = reg2 = reg3 = 0;
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/* Build up column parity */
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for(i = 0; i < 256; i++) {
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/* Get CP0 - CP5 from table */
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idx = nand_ecc_precalc_table[*dat++];
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reg1 ^= (idx & 0x3f);
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/* All bit XOR = 1 ? */
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if (idx & 0x40) {
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reg3 ^= (uint8_t) i;
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reg2 ^= ~((uint8_t) i);
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}
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}
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/* Create non-inverted ECC code from line parity */
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tmp1 = (reg3 & 0x80) >> 0; /* B7 -> B7 */
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tmp1 |= (reg2 & 0x80) >> 1; /* B7 -> B6 */
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tmp1 |= (reg3 & 0x40) >> 1; /* B6 -> B5 */
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tmp1 |= (reg2 & 0x40) >> 2; /* B6 -> B4 */
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tmp1 |= (reg3 & 0x20) >> 2; /* B5 -> B3 */
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tmp1 |= (reg2 & 0x20) >> 3; /* B5 -> B2 */
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tmp1 |= (reg3 & 0x10) >> 3; /* B4 -> B1 */
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tmp1 |= (reg2 & 0x10) >> 4; /* B4 -> B0 */
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tmp2 = (reg3 & 0x08) << 4; /* B3 -> B7 */
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tmp2 |= (reg2 & 0x08) << 3; /* B3 -> B6 */
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tmp2 |= (reg3 & 0x04) << 3; /* B2 -> B5 */
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tmp2 |= (reg2 & 0x04) << 2; /* B2 -> B4 */
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tmp2 |= (reg3 & 0x02) << 2; /* B1 -> B3 */
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tmp2 |= (reg2 & 0x02) << 1; /* B1 -> B2 */
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tmp2 |= (reg3 & 0x01) << 1; /* B0 -> B1 */
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tmp2 |= (reg2 & 0x01) << 0; /* B7 -> B0 */
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/* Calculate final ECC code */
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#ifdef CONFIG_MTD_NAND_ECC_SMC
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ecc_code[0] = ~tmp2;
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ecc_code[1] = ~tmp1;
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#else
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ecc_code[0] = ~tmp1;
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ecc_code[1] = ~tmp2;
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#endif
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ecc_code[2] = ((~reg1) << 2) | 0x03;
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return 0;
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}
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/*
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* usage: bb-nandflash-ecc start_address size
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*/
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void usage(const char *prog)
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{
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fprintf(stderr, "Usage: %s [options] <input> <output>\n"
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"Options:\n"
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" -p <pagesize> NAND page size (default: %d)\n"
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" -o <oobsize> NAND OOB size (default: %d)\n"
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" -e <offset> NAND ECC offset (default: %d)\n"
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"\n", prog, DEF_NAND_PAGE_SIZE, DEF_NAND_OOB_SIZE,
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DEF_NAND_ECC_OFFSET);
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exit(1);
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}
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/*start_address/size does not include oob
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*/
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int main(int argc, char **argv)
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{
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uint8_t *page_data = NULL;
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uint8_t *ecc_data;
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int infd = -1, outfd = -1;
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int ret = 1;
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ssize_t bytes;
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int ch;
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while ((ch = getopt(argc, argv, "e:o:p:")) != -1) {
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switch(ch) {
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case 'p':
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page_size = strtoul(optarg, NULL, 0);
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break;
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case 'o':
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oob_size = strtoul(optarg, NULL, 0);
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break;
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case 'e':
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ecc_offset = strtoul(optarg, NULL, 0);
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break;
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default:
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usage(argv[0]);
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}
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}
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argc -= optind;
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if (argc < 2)
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usage(argv[0]);
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argv += optind;
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infd = open(argv[0], O_RDONLY, 0);
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if (infd < 0) {
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perror("open input file");
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goto out;
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}
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outfd = open(argv[1], O_WRONLY|O_CREAT|O_TRUNC, 0644);
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if (outfd < 0) {
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perror("open output file");
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goto out;
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}
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page_data = malloc(page_size + oob_size);
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while ((bytes = read(infd, page_data, page_size)) == page_size) {
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int j;
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ecc_data = page_data + page_size + ecc_offset;
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for (j = 0; j < page_size / 256; j++)
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{
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nand_calculate_ecc(page_data + j * 256, ecc_data);
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ecc_data += 3;
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}
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write(outfd, page_data, page_size + oob_size);
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}
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ret = 0;
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out:
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if (infd >= 0)
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close(infd);
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if (outfd >= 0)
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close(outfd);
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if (page_data)
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free(page_data);
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return ret;
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}
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