1 // SPDX-License-Identifier: GPL-2.0-or-later 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 9 #include "internals.h" 10 11 static void amd_nand_decode_id(struct nand_chip *chip) 12 { 13 struct mtd_info *mtd = nand_to_mtd(chip); 14 struct nand_memory_organization *memorg; 15 16 memorg = nanddev_get_memorg(&chip->base); 17 18 nand_decode_ext_id(chip); 19 20 /* 21 * Check for Spansion/AMD ID + repeating 5th, 6th byte since 22 * some Spansion chips have erasesize that conflicts with size 23 * listed in nand_ids table. 24 * Data sheet (5 byte ID): Spansion S30ML-P ORNAND (p.39) 25 */ 26 if (chip->id.data[4] != 0x00 && chip->id.data[5] == 0x00 && 27 chip->id.data[6] == 0x00 && chip->id.data[7] == 0x00 && 28 memorg->pagesize == 512) { 29 memorg->pages_per_eraseblock = 256; 30 memorg->pages_per_eraseblock <<= ((chip->id.data[3] & 0x03) << 1); 31 mtd->erasesize = memorg->pages_per_eraseblock * 32 memorg->pagesize; 33 } 34 } 35 36 static int amd_nand_init(struct nand_chip *chip) 37 { 38 if (nand_is_slc(chip)) 39 /* 40 * According to the datasheet of some Cypress SLC NANDs, 41 * the bad block markers can be in the first, second or last 42 * page of a block. So let's check all three locations. 43 */ 44 chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE | 45 NAND_BBM_LASTPAGE; 46 47 return 0; 48 } 49 50 const struct nand_manufacturer_ops amd_nand_manuf_ops = { 51 .detect = amd_nand_decode_id, 52 .init = amd_nand_init, 53 }; 54