1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2018 Toradex AG
5 * Author: Marcel Ziswiler <marcel.ziswiler@toradex.com>
8 #include <linux/mtd/rawnand.h>
11 static void esmt_nand_decode_id(struct nand_chip *chip)
13 struct nand_device *base = &chip->base;
14 struct nand_ecc_props requirements = {};
16 nand_decode_ext_id(chip);
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) {
23 requirements.strength = 4;
26 requirements.strength = 2;
29 requirements.strength = 1;
32 WARN(1, "Could not get ECC info");
33 requirements.step_size = 0;
38 nanddev_set_ecc_requirements(base, &requirements);
41 static int esmt_nand_init(struct nand_chip *chip)
43 if (nand_is_slc(chip))
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.
50 chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE |
56 const struct nand_manufacturer_ops esmt_nand_manuf_ops = {
57 .detect = esmt_nand_decode_id,
58 .init = esmt_nand_init,