1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2018 Toradex AG
4 *
5 * Author: Marcel Ziswiler <marcel.ziswiler@toradex.com>
6 */
7
8#include <linux/mtd/rawnand.h>
9#include "internals.h"
10
11static void esmt_nand_decode_id(struct nand_chip *chip)
12{
13	struct nand_device *base = &chip->base;
14	struct nand_ecc_props requirements = {};
15
16	nand_decode_ext_id(chip);
17
18	/* Extract ECC requirements from 5th id byte. */
19	if (chip->id.len >= 5 && nand_is_slc(chip)) {
20		requirements.step_size = 512;
21		switch (chip->id.data[4] & 0x3) {
22		case 0x0:
23			requirements.strength = 4;
24			break;
25		case 0x1:
26			requirements.strength = 2;
27			break;
28		case 0x2:
29			requirements.strength = 1;
30			break;
31		default:
32			WARN(1, "Could not get ECC info");
33			requirements.step_size = 0;
34			break;
35		}
36	}
37
38	nanddev_set_ecc_requirements(base, &requirements);
39}
40
41static int esmt_nand_init(struct nand_chip *chip)
42{
43	if (nand_is_slc(chip))
44		/*
45		 * It is known that some ESMT SLC NANDs have been shipped
46		 * with the factory bad block markers in the first or last page
47		 * of the block, instead of the first or second page. To be on
48		 * the safe side, let's check all three locations.
49		 */
50		chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE |
51				 NAND_BBM_LASTPAGE;
52
53	return 0;
54}
55
56const struct nand_manufacturer_ops esmt_nand_manuf_ops = {
57	.detect = esmt_nand_decode_id,
58	.init = esmt_nand_init,
59};
60