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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,3 @@ | ||
| src-rt-6.x/.config | ||
| src-rt/.config | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,6 +1,6 @@ | ||
| cfe patch against brcm sdk linux-2.6-router-6.30.39.16 | ||
| - src/cfe/cfe/arch/mips/board/bcm947xx/src/ui_bcm947xx.c | ||
| - src/include/amemc_core.h | ||
| - src/include/bcmnvram.h | ||
| - src/include/nflash.h | ||
| - src/shared/nflash.c | ||
| - src/shared/nand_ecc.c |
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * 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 ([email protected]) | ||
| * Toshiba America Electronics Components, Inc. | ||
| * | ||
| * Copyright (C) 2006 Thomas Gleixner <[email protected]> | ||
| * | ||
| * $Id: nand_ecc.c,v 1.1.1.1 2007-08-03 18:52:44 rnuti Exp $ | ||
| * | ||
| * 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 <typedefs.h> | ||
| typedef uint8 u_char; | ||
| struct mtd_info { | ||
| }; | ||
| typedef uint8 uint8_t; | ||
| typedef uint16 uint16_t; | ||
| typedef uint32 uint32_t; | ||
| int nand_calculate_ecc(void *mtd, const u_char *dat, | ||
| u_char *ecc_code); | ||
| int nand_correct_data(void *mtd, u_char *dat, | ||
| u_char *read_ecc, u_char *calc_ecc); | ||
|
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||
|
|
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| /* | ||
| * Pre-calculated 256-way 1 byte column parity | ||
| */ | ||
| static const u_char 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 | ||
| * @mtd: MTD block structure | ||
| * @dat: raw data | ||
| * @ecc_code: buffer for ECC | ||
| */ | ||
| int nand_calculate_ecc(void *mtd, const u_char *dat, | ||
| u_char *ecc_code) | ||
| { | ||
| uint8_t idx, reg1, reg2, reg3, tmp1, tmp2; | ||
| int i; | ||
|
|
||
| /* Initialize variables */ | ||
| reg1 = reg2 = reg3 = 0; | ||
|
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| /* 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 */ | ||
|
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| 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; | ||
|
|
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| return 0; | ||
| } | ||
|
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|
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| static inline int countbits(uint32_t byte) | ||
| { | ||
| int res = 0; | ||
|
|
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| for (;byte; byte >>= 1) | ||
| res += byte & 0x01; | ||
| return res; | ||
| } | ||
|
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| /** | ||
| * nand_correct_data - [NAND Interface] Detect and correct bit error(s) | ||
| * @mtd: MTD block structure | ||
| * @dat: raw data read from the chip | ||
| * @read_ecc: ECC from the chip | ||
| * @calc_ecc: the ECC calculated from raw data | ||
| * | ||
| * Detect and correct a 1 bit error for 256 byte block | ||
| */ | ||
| int nand_correct_data(void *mtd, u_char *dat, | ||
| u_char *read_ecc, u_char *calc_ecc) | ||
| { | ||
| uint8_t s0, s1, s2; | ||
|
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| #ifdef CONFIG_MTD_NAND_ECC_SMC | ||
| s0 = calc_ecc[0] ^ read_ecc[0]; | ||
| s1 = calc_ecc[1] ^ read_ecc[1]; | ||
| s2 = calc_ecc[2] ^ read_ecc[2]; | ||
| #else | ||
| s1 = calc_ecc[0] ^ read_ecc[0]; | ||
| s0 = calc_ecc[1] ^ read_ecc[1]; | ||
| s2 = calc_ecc[2] ^ read_ecc[2]; | ||
| #endif | ||
| if ((s0 | s1 | s2) == 0) | ||
| return 0; | ||
|
|
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| /* Check for a single bit error */ | ||
| if( ((s0 ^ (s0 >> 1)) & 0x55) == 0x55 && | ||
| ((s1 ^ (s1 >> 1)) & 0x55) == 0x55 && | ||
| ((s2 ^ (s2 >> 1)) & 0x54) == 0x54) { | ||
|
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| uint32_t byteoffs, bitnum; | ||
|
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| byteoffs = (s1 << 0) & 0x80; | ||
| byteoffs |= (s1 << 1) & 0x40; | ||
| byteoffs |= (s1 << 2) & 0x20; | ||
| byteoffs |= (s1 << 3) & 0x10; | ||
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| byteoffs |= (s0 >> 4) & 0x08; | ||
| byteoffs |= (s0 >> 3) & 0x04; | ||
| byteoffs |= (s0 >> 2) & 0x02; | ||
| byteoffs |= (s0 >> 1) & 0x01; | ||
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| bitnum = (s2 >> 5) & 0x04; | ||
| bitnum |= (s2 >> 4) & 0x02; | ||
| bitnum |= (s2 >> 3) & 0x01; | ||
|
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| dat[byteoffs] ^= (1 << bitnum); | ||
|
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| return 1; | ||
| } | ||
|
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| if(countbits(s0 | ((uint32_t)s1 << 8) | ((uint32_t)s2 <<16)) == 1) | ||
| return 1; | ||
|
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| return -1; | ||
| } |
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