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