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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 <linux/mtd/nand.h> | |
19 | ||
20 | static void toshiba_nand_decode_id(struct nand_chip *chip) | |
21 | { | |
22 | struct mtd_info *mtd = nand_to_mtd(chip); | |
23 | ||
24 | nand_decode_ext_id(chip); | |
25 | ||
26 | /* | |
27 | * Toshiba 24nm raw SLC (i.e., not BENAND) have 32B OOB per | |
28 | * 512B page. For Toshiba SLC, we decode the 5th/6th byte as | |
29 | * follows: | |
30 | * - ID byte 6, bits[2:0]: 100b -> 43nm, 101b -> 32nm, | |
31 | * 110b -> 24nm | |
32 | * - ID byte 5, bit[7]: 1 -> BENAND, 0 -> raw SLC | |
33 | */ | |
34 | if (chip->id.len >= 6 && nand_is_slc(chip) && | |
35 | (chip->id.data[5] & 0x7) == 0x6 /* 24nm */ && | |
36 | !(chip->id.data[4] & 0x80) /* !BENAND */) | |
37 | mtd->oobsize = 32 * mtd->writesize >> 9; | |
38 | } | |
39 | ||
40 | static int toshiba_nand_init(struct nand_chip *chip) | |
41 | { | |
42 | if (nand_is_slc(chip)) | |
43 | chip->bbt_options |= NAND_BBT_SCAN2NDPAGE; | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
48 | const struct nand_manufacturer_ops toshiba_nand_manuf_ops = { | |
49 | .detect = toshiba_nand_decode_id, | |
50 | .init = toshiba_nand_init, | |
51 | }; |