1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (C) 2017 Free Electrons 4 * Copyright (C) 2017 NextThing Co 5 * 6 * Author: Boris Brezillon <boris.brezillon@free-electrons.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19#include <linux/mtd/rawnand.h> 20 21static void amd_nand_decode_id(struct nand_chip *chip) 22{ 23 struct mtd_info *mtd = nand_to_mtd(chip); 24 25 nand_decode_ext_id(chip); 26 27 /* 28 * Check for Spansion/AMD ID + repeating 5th, 6th byte since 29 * some Spansion chips have erasesize that conflicts with size 30 * listed in nand_ids table. 31 * Data sheet (5 byte ID): Spansion S30ML-P ORNAND (p.39) 32 */ 33 if (chip->id.data[4] != 0x00 && chip->id.data[5] == 0x00 && 34 chip->id.data[6] == 0x00 && chip->id.data[7] == 0x00 && 35 mtd->writesize == 512) { 36 mtd->erasesize = 128 * 1024; 37 mtd->erasesize <<= ((chip->id.data[3] & 0x03) << 1); 38 } 39} 40 41static int amd_nand_init(struct nand_chip *chip) 42{ 43 if (nand_is_slc(chip)) 44 chip->bbt_options |= NAND_BBT_SCAN2NDPAGE; 45 46 return 0; 47} 48 49const struct nand_manufacturer_ops amd_nand_manuf_ops = { 50 .detect = amd_nand_decode_id, 51 .init = amd_nand_init, 52}; 53