| 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 | |
| 11 | static 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(nand: base, reqs: &requirements); |
| 39 | } |
| 40 | |
| 41 | static 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 | |
| 56 | const struct nand_manufacturer_ops esmt_nand_manuf_ops = { |
| 57 | .detect = esmt_nand_decode_id, |
| 58 | .init = esmt_nand_init, |
| 59 | }; |
| 60 |