3  * This file provides ECC correction for more than 1 bit per block of data,
24  * @ecclayout: private ecc layout for this BCH configuration
26  * @eccmask:   XOR ecc mask, allows erased pages to be decoded as valid
36  * nand_bch_calculate_ecc - [NAND Interface] Calculate ECC for data block
39  * @code:	output buffer with ECC
45 	struct nand_bch_control *nbc = chip->ecc.priv;  in nand_bch_calculate_ecc()
48 	memset(code, 0, chip->ecc.bytes);  in nand_bch_calculate_ecc()
49 	encode_bch(nbc->bch, buf, chip->ecc.size, code);  in nand_bch_calculate_ecc()
52 	for (i = 0; i < chip->ecc.bytes; i++)  in nand_bch_calculate_ecc()
62  * @read_ecc:	ECC from the chip
63  * @calc_ecc:	the ECC calculated from raw data
71 	struct nand_bch_control *nbc = chip->ecc.priv;  in nand_bch_correct_data()
75 	count = decode_bch(nbc->bch, NULL, chip->ecc.size, read_ecc, calc_ecc,  in nand_bch_correct_data()
79 			if (errloc[i] < (chip->ecc.size*8))  in nand_bch_correct_data()
82 			/* else error in ecc, no action needed */  in nand_bch_correct_data()
88 		printk(KERN_ERR "ecc unrecoverable error\n");  in nand_bch_correct_data()
114 	struct nand_ecclayout *layout = nand->ecc.layout;  in nand_bch_init()
117 	unsigned int eccsize = nand->ecc.size;  in nand_bch_init()
118 	unsigned int eccbytes = nand->ecc.bytes;  in nand_bch_init()
119 	unsigned int eccstrength = nand->ecc.strength;  in nand_bch_init()
123 		nand->ecc.bytes = eccbytes;  in nand_bch_init()
127 		printk(KERN_WARNING "ecc parameters not supplied\n");  in nand_bch_init()
151 	/* if no ecc placement scheme was provided, build one */  in nand_bch_init()
171 		/* put ecc bytes at oob tail */  in nand_bch_init()
178 		nand->ecc.layout = layout;  in nand_bch_init()
187 		printk(KERN_WARNING "invalid ecc layout\n");  in nand_bch_init()
196 	 * compute and store the inverted ecc of an erased ecc block  in nand_bch_init()
211 		nand->ecc.strength = (eccbytes * 8) / fls(8 * eccsize);  in nand_bch_init()
220  * nand_bch_free - [NAND Interface] Release NAND BCH ECC resources