1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2018 Toradex AG 4 * 5 * Author: Marcel Ziswiler <marcel.ziswiler@toradex.com> 6 */ 7 8 #include <linux/mtd/rawnand.h> 9 #include "internals.h" 10 11 static void esmt_nand_decode_id(struct nand_chip *chip) 12 { 13 nand_decode_ext_id(chip); 14 15 /* Extract ECC requirements from 5th id byte. */ 16 if (chip->id.len >= 5 && nand_is_slc(chip)) { 17 chip->ecc_step_ds = 512; 18 switch (chip->id.data[4] & 0x3) { 19 case 0x0: 20 chip->ecc_strength_ds = 4; 21 break; 22 case 0x1: 23 chip->ecc_strength_ds = 2; 24 break; 25 case 0x2: 26 chip->ecc_strength_ds = 1; 27 break; 28 default: 29 WARN(1, "Could not get ECC info"); 30 chip->ecc_step_ds = 0; 31 break; 32 } 33 } 34 } 35 36 static int esmt_nand_init(struct nand_chip *chip) 37 { 38 if (nand_is_slc(chip)) 39 chip->bbt_options |= NAND_BBT_SCAN2NDPAGE; 40 41 return 0; 42 } 43 44 const struct nand_manufacturer_ops esmt_nand_manuf_ops = { 45 .detect = esmt_nand_decode_id, 46 .init = esmt_nand_init, 47 }; 48