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/nand.h> 19 20static void toshiba_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 * Toshiba 24nm raw SLC (i.e., not BENAND) have 32B OOB per 28 * 512B page. For Toshiba SLC, we decode the 5th/6th byte as 29 * follows: 30 * - ID byte 6, bits[2:0]: 100b -> 43nm, 101b -> 32nm, 31 * 110b -> 24nm 32 * - ID byte 5, bit[7]: 1 -> BENAND, 0 -> raw SLC 33 */ 34 if (chip->id.len >= 6 && nand_is_slc(chip) && 35 (chip->id.data[5] & 0x7) == 0x6 /* 24nm */ && 36 !(chip->id.data[4] & 0x80) /* !BENAND */) 37 mtd->oobsize = 32 * mtd->writesize >> 9; 38} 39 40static int toshiba_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 48const struct nand_manufacturer_ops toshiba_nand_manuf_ops = { 49 .detect = toshiba_nand_decode_id, 50 .init = toshiba_nand_init, 51}; 52