nand/raw/nand_ecc.c

1 // SPDX-License-Identifier: GPL-2.0+
8  * Copyright (C) 2000-2004 Steven J. Hill (sjhill@realitydiluted.com)
32  * NAND-SPL has no sofware ECC for now, so don't include nand_calculate_ecc(),
38  * Pre-calculated 256-way 1 byte column parity
60  * nand_calculate_ecc - [NAND Interface] Calculate 3-byte ECC for 256-byte block
76 		/* Get CP0 - CP5 from table */  in nand_calculate_ecc()
87 	/* Create non-inverted ECC code from line parity */  in nand_calculate_ecc()
88 	tmp1  = (reg3 & 0x80) >> 0; /* B7 -> B7 */  in nand_calculate_ecc()
89 	tmp1 |= (reg2 & 0x80) >> 1; /* B7 -> B6 */  in nand_calculate_ecc()
90 	tmp1 |= (reg3 & 0x40) >> 1; /* B6 -> B5 */  in nand_calculate_ecc()
91 	tmp1 |= (reg2 & 0x40) >> 2; /* B6 -> B4 */  in nand_calculate_ecc()
92 	tmp1 |= (reg3 & 0x20) >> 2; /* B5 -> B3 */  in nand_calculate_ecc()
93 	tmp1 |= (reg2 & 0x20) >> 3; /* B5 -> B2 */  in nand_calculate_ecc()
94 	tmp1 |= (reg3 & 0x10) >> 3; /* B4 -> B1 */  in nand_calculate_ecc()
95 	tmp1 |= (reg2 & 0x10) >> 4; /* B4 -> B0 */  in nand_calculate_ecc()
97 	tmp2  = (reg3 & 0x08) << 4; /* B3 -> B7 */  in nand_calculate_ecc()
98 	tmp2 |= (reg2 & 0x08) << 3; /* B3 -> B6 */  in nand_calculate_ecc()
99 	tmp2 |= (reg3 & 0x04) << 3; /* B2 -> B5 */  in nand_calculate_ecc()
100 	tmp2 |= (reg2 & 0x04) << 2; /* B2 -> B4 */  in nand_calculate_ecc()
101 	tmp2 |= (reg3 & 0x02) << 2; /* B1 -> B3 */  in nand_calculate_ecc()
102 	tmp2 |= (reg2 & 0x02) << 1; /* B1 -> B2 */  in nand_calculate_ecc()
103 	tmp2 |= (reg3 & 0x01) << 1; /* B0 -> B1 */  in nand_calculate_ecc()
104 	tmp2 |= (reg2 & 0x01) << 0; /* B7 -> B0 */  in nand_calculate_ecc()
125  * nand_correct_data - [NAND Interface] Detect and correct bit error(s)
173 	return -EBADMSG;  in nand_correct_data()