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 "internals.h" 19 20 static void amd_nand_decode_id(struct nand_chip *chip) 21 { 22 struct mtd_info *mtd = nand_to_mtd(chip); 23 struct nand_memory_organization *memorg; 24 25 memorg = nanddev_get_memorg(&chip->base); 26 27 nand_decode_ext_id(chip); 28 29 /* 30 * Check for Spansion/AMD ID + repeating 5th, 6th byte since 31 * some Spansion chips have erasesize that conflicts with size 32 * listed in nand_ids table. 33 * Data sheet (5 byte ID): Spansion S30ML-P ORNAND (p.39) 34 */ 35 if (chip->id.data[4] != 0x00 && chip->id.data[5] == 0x00 && 36 chip->id.data[6] == 0x00 && chip->id.data[7] == 0x00 && 37 memorg->pagesize == 512) { 38 memorg->pages_per_eraseblock = 256; 39 memorg->pages_per_eraseblock <<= ((chip->id.data[3] & 0x03) << 1); 40 mtd->erasesize = memorg->pages_per_eraseblock * 41 memorg->pagesize; 42 } 43 } 44 45 static int amd_nand_init(struct nand_chip *chip) 46 { 47 if (nand_is_slc(chip)) 48 /* 49 * According to the datasheet of some Cypress SLC NANDs, 50 * the bad block markers can be in the first, second or last 51 * page of a block. So let's check all three locations. 52 */ 53 chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE | 54 NAND_BBM_LASTPAGE; 55 56 return 0; 57 } 58 59 const struct nand_manufacturer_ops amd_nand_manuf_ops = { 60 .detect = amd_nand_decode_id, 61 .init = amd_nand_init, 62 }; 63