2 * Copyright (C) 2017 Free Electrons
3 * Copyright (C) 2017 NextThing Co
5 * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
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.
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.
18 #include "internals.h"
20 static void amd_nand_decode_id(struct nand_chip
*chip
)
22 struct mtd_info
*mtd
= nand_to_mtd(chip
);
23 struct nand_memory_organization
*memorg
;
25 memorg
= nanddev_get_memorg(&chip
->base
);
27 nand_decode_ext_id(chip
);
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)
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
*
45 static int amd_nand_init(struct nand_chip
*chip
)
47 if (nand_is_slc(chip
))
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.
53 chip
->options
|= NAND_BBM_FIRSTPAGE
| NAND_BBM_SECONDPAGE
|
59 const struct nand_manufacturer_ops amd_nand_manuf_ops
= {
60 .detect
= amd_nand_decode_id
,
61 .init
= amd_nand_init
,