25  * ECC4 and ECC1 have 13 bytes and 3 bytes of ecc respectively for 512 bytes of
63  * of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 118
98  * ECC placement definitions in oobfree type format
99  * There are 13 bytes of ecc for every 512 byte block and it has to be read
102  * Managing the ecc bytes in the following way makes it easier for software to
103  * read ecc bytes consecutive to data bytes. This way is similar to
197 	/* The calculated ecc is actually the correction index in data */  in fsmc_bch8_correct_data()
210 		 * would result in an ecc error because the oob data is also  in fsmc_bch8_correct_data()
211 		 * erased to FF and the calculated ecc for an FF data is not  in fsmc_bch8_correct_data()
262 			const u_char *data, u_char *ecc)  in fsmc_read_hwecc()  argument
273 			 * Busy waiting for ecc computation  in fsmc_read_hwecc()
281 		ecc[0] = (u_char) (ecc_tmp >> 0);  in fsmc_read_hwecc()
282 		ecc[1] = (u_char) (ecc_tmp >> 8);  in fsmc_read_hwecc()
283 		ecc[2] = (u_char) (ecc_tmp >> 16);  in fsmc_read_hwecc()
284 		ecc[3] = (u_char) (ecc_tmp >> 24);  in fsmc_read_hwecc()
287 		ecc[4] = (u_char) (ecc_tmp >> 0);  in fsmc_read_hwecc()
288 		ecc[5] = (u_char) (ecc_tmp >> 8);  in fsmc_read_hwecc()
289 		ecc[6] = (u_char) (ecc_tmp >> 16);  in fsmc_read_hwecc()
290 		ecc[7] = (u_char) (ecc_tmp >> 24);  in fsmc_read_hwecc()
293 		ecc[8] = (u_char) (ecc_tmp >> 0);  in fsmc_read_hwecc()
294 		ecc[9] = (u_char) (ecc_tmp >> 8);  in fsmc_read_hwecc()
295 		ecc[10] = (u_char) (ecc_tmp >> 16);  in fsmc_read_hwecc()
296 		ecc[11] = (u_char) (ecc_tmp >> 24);  in fsmc_read_hwecc()
299 		ecc[12] = (u_char) (ecc_tmp >> 16);  in fsmc_read_hwecc()
304 		ecc[0] = (u_char) (ecc_tmp >> 0);  in fsmc_read_hwecc()
305 		ecc[1] = (u_char) (ecc_tmp >> 8);  in fsmc_read_hwecc()
306 		ecc[2] = (u_char) (ecc_tmp >> 16);  in fsmc_read_hwecc()
333  * data(512 byte) -> ecc(13 byte)
341 	int i, j, s, stat, eccsize = chip->ecc.size;  in fsmc_read_page_hwecc()
342 	int eccbytes = chip->ecc.bytes;  in fsmc_read_page_hwecc()
343 	int eccsteps = chip->ecc.steps;  in fsmc_read_page_hwecc()
350 	/* Differentiate between small and large page ecc place definitions */  in fsmc_read_page_hwecc()
359 		chip->ecc.hwctl(mtd, NAND_ECC_READ);  in fsmc_read_page_hwecc()
380 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);  in fsmc_read_page_hwecc()
382 		stat = chip->ecc.correct(mtd, p, &ecc_code[i],  in fsmc_read_page_hwecc()
395  * fsmc_nand_switch_ecc - switch the ECC operation between different engines
408 	 * 1 bit HW ECC. The BCH8 HW ECC (FSMC_VER8) from the ST-Ericsson  in fsmc_nand_switch_ecc()
410 	 * function, as it doesn't need to switch to a different ECC layout.  in fsmc_nand_switch_ecc()
415 	/* Setup the ecc configurations again */  in fsmc_nand_switch_ecc()
417 		nand->ecc.mode = NAND_ECC_HW;  in fsmc_nand_switch_ecc()
418 		nand->ecc.bytes = 3;  in fsmc_nand_switch_ecc()
419 		nand->ecc.strength = 1;  in fsmc_nand_switch_ecc()
420 		nand->ecc.layout = &fsmc_ecc1_layout;  in fsmc_nand_switch_ecc()
421 		nand->ecc.calculate = fsmc_read_hwecc;  in fsmc_nand_switch_ecc()
422 		nand->ecc.correct = nand_correct_data;  in fsmc_nand_switch_ecc()
428 		nand->ecc.mode = NAND_ECC_SOFT_BCH;  in fsmc_nand_switch_ecc()
429 		nand->ecc.strength = 4;  in fsmc_nand_switch_ecc()
430 		nand->ecc.layout = NULL;  in fsmc_nand_switch_ecc()
432 		printf("Error: ECC strength %d not supported!\n", eccstrength);  in fsmc_nand_switch_ecc()
435 	/* Update NAND handling after ECC mode switch */  in fsmc_nand_switch_ecc()
473 	nand->ecc.mode = NAND_ECC_HW;  in fsmc_nand_init()
474 	nand->ecc.size = 512;  in fsmc_nand_init()
475 	nand->ecc.calculate = fsmc_read_hwecc;  in fsmc_nand_init()
476 	nand->ecc.hwctl = fsmc_enable_hwecc;  in fsmc_nand_init()
486 		nand->ecc.bytes = 13;  in fsmc_nand_init()
487 		nand->ecc.strength = 8;  in fsmc_nand_init()
488 		nand->ecc.correct = fsmc_bch8_correct_data;  in fsmc_nand_init()
489 		nand->ecc.read_page = fsmc_read_page_hwecc;  in fsmc_nand_init()
491 			nand->ecc.layout = &fsmc_ecc4_sp_layout;  in fsmc_nand_init()
494 				nand->ecc.layout = &fsmc_ecc4_224_layout;  in fsmc_nand_init()
496 				nand->ecc.layout = &fsmc_ecc4_lp_layout;  in fsmc_nand_init()
501 		nand->ecc.bytes = 3;  in fsmc_nand_init()
502 		nand->ecc.strength = 1;  in fsmc_nand_init()
503 		nand->ecc.layout = &fsmc_ecc1_layout;  in fsmc_nand_init()
504 		nand->ecc.correct = nand_correct_data;  in fsmc_nand_init()