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/bug.h> 20#include <linux/mtd/rawnand.h> 21 22static void toshiba_nand_decode_id(struct nand_chip *chip) 23{ 24 struct mtd_info *mtd = nand_to_mtd(chip); 25 26 nand_decode_ext_id(chip); 27 28 /* 29 * Toshiba 24nm raw SLC (i.e., not BENAND) have 32B OOB per 30 * 512B page. For Toshiba SLC, we decode the 5th/6th byte as 31 * follows: 32 * - ID byte 6, bits[2:0]: 100b -> 43nm, 101b -> 32nm, 33 * 110b -> 24nm 34 * - ID byte 5, bit[7]: 1 -> BENAND, 0 -> raw SLC 35 */ 36 if (chip->id.len >= 6 && nand_is_slc(chip) && 37 (chip->id.data[5] & 0x7) == 0x6 /* 24nm */ && 38 !(chip->id.data[4] & 0x80) /* !BENAND */) 39 mtd->oobsize = 32 * mtd->writesize >> 9; 40 41 /* 42 * Extract ECC requirements from 6th id byte. 43 * For Toshiba SLC, ecc requrements are as follows: 44 * - 43nm: 1 bit ECC for each 512Byte is required. 45 * - 32nm: 4 bit ECC for each 512Byte is required. 46 * - 24nm: 8 bit ECC for each 512Byte is required. 47 */ 48 if (chip->id.len >= 6 && nand_is_slc(chip)) { 49 chip->ecc_step_ds = 512; 50 switch (chip->id.data[5] & 0x7) { 51 case 0x4: 52 chip->ecc_strength_ds = 1; 53 break; 54 case 0x5: 55 chip->ecc_strength_ds = 4; 56 break; 57 case 0x6: 58 chip->ecc_strength_ds = 8; 59 break; 60 default: 61 WARN(1, "Could not get ECC info"); 62 chip->ecc_step_ds = 0; 63 break; 64 } 65 } 66} 67 68static int toshiba_nand_init(struct nand_chip *chip) 69{ 70 if (nand_is_slc(chip)) 71 chip->bbt_options |= NAND_BBT_SCAN2NDPAGE; 72 73 return 0; 74} 75 76const struct nand_manufacturer_ops toshiba_nand_manuf_ops = { 77 .detect = toshiba_nand_decode_id, 78 .init = toshiba_nand_init, 79}; 80