diff options
Diffstat (limited to 'tools/firmware-utils/src/nand_ecc.c')
| -rw-r--r-- | tools/firmware-utils/src/nand_ecc.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/tools/firmware-utils/src/nand_ecc.c b/tools/firmware-utils/src/nand_ecc.c new file mode 100644 index 0000000..b1e9305 --- /dev/null +++ b/tools/firmware-utils/src/nand_ecc.c @@ -0,0 +1,204 @@ +/* + * calculate ecc code for nand flash + * + * Copyright (C) 2008 yajin <yajin@vm-kernel.org> + * Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 or + * (at your option) version 3 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + + +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <stdlib.h> +#include <stdint.h> +#include <fcntl.h> +#include <stdio.h> + +#define DEF_NAND_PAGE_SIZE 2048 +#define DEF_NAND_OOB_SIZE 64 +#define DEF_NAND_ECC_OFFSET 0x28 + +static int page_size = DEF_NAND_PAGE_SIZE; +static int oob_size = DEF_NAND_OOB_SIZE; +static int ecc_offset = DEF_NAND_ECC_OFFSET; + +/* + * Pre-calculated 256-way 1 byte column parity + */ +static const uint8_t nand_ecc_precalc_table[] = { + 0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00, + 0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65, + 0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66, + 0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03, + 0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69, + 0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c, + 0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f, + 0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a, + 0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a, + 0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f, + 0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c, + 0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69, + 0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03, + 0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66, + 0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65, + 0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00 +}; + +/** + * nand_calculate_ecc - [NAND Interface] Calculate 3-byte ECC for 256-byte block + * @dat: raw data + * @ecc_code: buffer for ECC + */ +int nand_calculate_ecc(const uint8_t *dat, + uint8_t *ecc_code) +{ + uint8_t idx, reg1, reg2, reg3, tmp1, tmp2; + int i; + + /* Initialize variables */ + reg1 = reg2 = reg3 = 0; + + /* Build up column parity */ + for(i = 0; i < 256; i++) { + /* Get CP0 - CP5 from table */ + idx = nand_ecc_precalc_table[*dat++]; + reg1 ^= (idx & 0x3f); + + /* All bit XOR = 1 ? */ + if (idx & 0x40) { + reg3 ^= (uint8_t) i; + reg2 ^= ~((uint8_t) i); + } + } + + /* Create non-inverted ECC code from line parity */ + tmp1 = (reg3 & 0x80) >> 0; /* B7 -> B7 */ + tmp1 |= (reg2 & 0x80) >> 1; /* B7 -> B6 */ + tmp1 |= (reg3 & 0x40) >> 1; /* B6 -> B5 */ + tmp1 |= (reg2 & 0x40) >> 2; /* B6 -> B4 */ + tmp1 |= (reg3 & 0x20) >> 2; /* B5 -> B3 */ + tmp1 |= (reg2 & 0x20) >> 3; /* B5 -> B2 */ + tmp1 |= (reg3 & 0x10) >> 3; /* B4 -> B1 */ + tmp1 |= (reg2 & 0x10) >> 4; /* B4 -> B0 */ + + tmp2 = (reg3 & 0x08) << 4; /* B3 -> B7 */ + tmp2 |= (reg2 & 0x08) << 3; /* B3 -> B6 */ + tmp2 |= (reg3 & 0x04) << 3; /* B2 -> B5 */ + tmp2 |= (reg2 & 0x04) << 2; /* B2 -> B4 */ + tmp2 |= (reg3 & 0x02) << 2; /* B1 -> B3 */ + tmp2 |= (reg2 & 0x02) << 1; /* B1 -> B2 */ + tmp2 |= (reg3 & 0x01) << 1; /* B0 -> B1 */ + tmp2 |= (reg2 & 0x01) << 0; /* B7 -> B0 */ + + /* Calculate final ECC code */ +#ifdef CONFIG_MTD_NAND_ECC_SMC + ecc_code[0] = ~tmp2; + ecc_code[1] = ~tmp1; +#else + ecc_code[0] = ~tmp1; + ecc_code[1] = ~tmp2; +#endif + ecc_code[2] = ((~reg1) << 2) | 0x03; + + return 0; +} + +/* + * usage: bb-nandflash-ecc start_address size + */ +void usage(const char *prog) +{ + fprintf(stderr, "Usage: %s [options] <input> <output>\n" + "Options:\n" + " -p <pagesize> NAND page size (default: %d)\n" + " -o <oobsize> NAND OOB size (default: %d)\n" + " -e <offset> NAND ECC offset (default: %d)\n" + "\n", prog, DEF_NAND_PAGE_SIZE, DEF_NAND_OOB_SIZE, + DEF_NAND_ECC_OFFSET); + exit(1); +} + +/*start_address/size does not include oob + */ +int main(int argc, char **argv) +{ + uint8_t *page_data = NULL; + uint8_t *ecc_data; + int infd = -1, outfd = -1; + int ret = 1; + ssize_t bytes; + int ch; + + while ((ch = getopt(argc, argv, "e:o:p:")) != -1) { + switch(ch) { + case 'p': + page_size = strtoul(optarg, NULL, 0); + break; + case 'o': + oob_size = strtoul(optarg, NULL, 0); + break; + case 'e': + ecc_offset = strtoul(optarg, NULL, 0); + break; + default: + usage(argv[0]); + } + } + argc -= optind; + if (argc < 2) + usage(argv[0]); + + argv += optind; + + infd = open(argv[0], O_RDONLY, 0); + if (infd < 0) { + perror("open input file"); + goto out; + } + + outfd = open(argv[1], O_WRONLY|O_CREAT|O_TRUNC, 0644); + if (outfd < 0) { + perror("open output file"); + goto out; + } + + page_data = malloc(page_size + oob_size); + + while ((bytes = read(infd, page_data, page_size)) == page_size) { + int j; + + ecc_data = page_data + page_size + ecc_offset; + for (j = 0; j < page_size / 256; j++) + { + nand_calculate_ecc(page_data + j * 256, ecc_data); + ecc_data += 3; + } + write(outfd, page_data, page_size + oob_size); + } + + ret = 0; +out: + if (infd >= 0) + close(infd); + if (outfd >= 0) + close(outfd); + if (page_data) + free(page_data); + return ret; +} + |