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/mtd/rawnand.h>
20
21static void amd_nand_decode_id(struct nand_chip *chip)
22{
23	struct mtd_info *mtd = nand_to_mtd(chip);
24
25	nand_decode_ext_id(chip);
26
27	/*
28	 * Check for Spansion/AMD ID + repeating 5th, 6th byte since
29	 * some Spansion chips have erasesize that conflicts with size
30	 * listed in nand_ids table.
31	 * Data sheet (5 byte ID): Spansion S30ML-P ORNAND (p.39)
32	 */
33	if (chip->id.data[4] != 0x00 && chip->id.data[5] == 0x00 &&
34	    chip->id.data[6] == 0x00 && chip->id.data[7] == 0x00 &&
35	    mtd->writesize == 512) {
36		mtd->erasesize = 128 * 1024;
37		mtd->erasesize <<= ((chip->id.data[3] & 0x03) << 1);
38	}
39}
40
41static int amd_nand_init(struct nand_chip *chip)
42{
43	if (nand_is_slc(chip))
44		chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
45
46	return 0;
47}
48
49const struct nand_manufacturer_ops amd_nand_manuf_ops = {
50	.detect = amd_nand_decode_id,
51	.init = amd_nand_init,
52};
53