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Diffstat (limited to 'ubi-utils/src/nandecc.c')
| -rw-r--r-- | ubi-utils/src/nandecc.c | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/ubi-utils/src/nandecc.c b/ubi-utils/src/nandecc.c deleted file mode 100644 index 71660ef..0000000 --- a/ubi-utils/src/nandecc.c +++ /dev/null @@ -1,159 +0,0 @@ -/* - * This file contains an ECC algorithm from Toshiba that detects and - * corrects 1 bit errors in a 256 byte block of data. - * - * drivers/mtd/nand/nand_ecc.c - * - * Copyright (C) 2000-2004 Steven J. Hill (sjhill@realitydiluted.com) - * Toshiba America Electronics Components, Inc. - * - * This file 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) any - * later version. - * - * This file 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 file; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. - * - * As a special exception, if other files instantiate templates or use - * macros or inline functions from these files, or you compile these - * files and link them with other works to produce a work based on these - * files, these files do not by themselves cause the resulting work to be - * covered by the GNU General Public License. However the source code for - * these files must still be made available in accordance with section (3) - * of the GNU General Public License. - * - * This exception does not invalidate any other reasons why a work based on - * this file might be covered by the GNU General Public License. - */ - -#include "nandecc.h" - -/* - * 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_trans_result - [GENERIC] create non-inverted ECC - * @reg2: line parity reg 2 - * @reg3: line parity reg 3 - * @ecc_code: ecc - * - * Creates non-inverted ECC code from line parity - */ -static void nand_trans_result(uint8_t reg2, uint8_t reg3, - uint8_t *ecc_code) -{ - uint8_t a, b, i, tmp1, tmp2; - - /* Initialize variables */ - a = b = 0x80; - tmp1 = tmp2 = 0; - - /* Calculate first ECC byte */ - for (i = 0; i < 4; i++) { - if (reg3 & a) /* LP15,13,11,9 --> ecc_code[0] */ - tmp1 |= b; - b >>= 1; - if (reg2 & a) /* LP14,12,10,8 --> ecc_code[0] */ - tmp1 |= b; - b >>= 1; - a >>= 1; - } - - /* Calculate second ECC byte */ - b = 0x80; - for (i = 0; i < 4; i++) { - if (reg3 & a) /* LP7,5,3,1 --> ecc_code[1] */ - tmp2 |= b; - b >>= 1; - if (reg2 & a) /* LP6,4,2,0 --> ecc_code[1] */ - tmp2 |= b; - b >>= 1; - a >>= 1; - } - - /* Store two of the ECC bytes */ - ecc_code[1] = tmp1; - ecc_code[0] = tmp2; -} - -/** - * nand_calculate_ecc - [NAND Interface] Calculate 3 byte ECC code 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; - int j; - - /* Initialize variables */ - reg1 = reg2 = reg3 = 0; - ecc_code[0] = ecc_code[1] = ecc_code[2] = 0; - - /* Build up column parity */ - for(j = 0; j < 256; j++) { - - /* Get CP0 - CP5 from table */ - idx = nand_ecc_precalc_table[dat[j]]; - reg1 ^= (idx & 0x3f); - - /* All bit XOR = 1 ? */ - if (idx & 0x40) { - reg3 ^= (uint8_t) j; - reg2 ^= ~((uint8_t) j); - } - } - - /* Create non-inverted ECC code from line parity */ - nand_trans_result(reg2, reg3, ecc_code); - - /* Calculate final ECC code */ - ecc_code[0] = ~ecc_code[0]; - ecc_code[1] = ~ecc_code[1]; - ecc_code[2] = ((~reg1) << 2) | 0x03; - return 0; -} |