| Michael Trimarchi | 6c8ef80 | 2022-07-20 18:22:09 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Copyright (C) 2017 Free Electrons |
| 4 | * Copyright (C) 2017 NextThing Co |
| 5 | * |
| 6 | * Author: Boris Brezillon <boris.brezillon@free-electrons.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/bug.h> |
| 20 | #include <linux/mtd/rawnand.h> |
| 21 | |
| 22 | static void samsung_nand_decode_id(struct nand_chip *chip) |
| 23 | { |
| 24 | struct mtd_info *mtd = nand_to_mtd(chip); |
| 25 | |
| 26 | /* New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44) */ |
| 27 | if (chip->id.len == 6 && !nand_is_slc(chip) && |
| 28 | chip->id.data[5] != 0x00) { |
| 29 | u8 extid = chip->id.data[3]; |
| 30 | |
| 31 | /* Get pagesize */ |
| 32 | mtd->writesize = 2048 << (extid & 0x03); |
| 33 | |
| 34 | extid >>= 2; |
| 35 | |
| 36 | /* Get oobsize */ |
| 37 | switch (((extid >> 2) & 0x4) | (extid & 0x3)) { |
| 38 | case 1: |
| 39 | mtd->oobsize = 128; |
| 40 | break; |
| 41 | case 2: |
| 42 | mtd->oobsize = 218; |
| 43 | break; |
| 44 | case 3: |
| 45 | mtd->oobsize = 400; |
| 46 | break; |
| 47 | case 4: |
| 48 | mtd->oobsize = 436; |
| 49 | break; |
| 50 | case 5: |
| 51 | mtd->oobsize = 512; |
| 52 | break; |
| 53 | case 6: |
| 54 | mtd->oobsize = 640; |
| 55 | break; |
| 56 | case 7: |
| 57 | default: /* Other cases are "reserved" (unknown) */ |
| 58 | WARN(1, "Invalid OOB size value"); |
| 59 | mtd->oobsize = 1024; |
| 60 | break; |
| 61 | } |
| 62 | |
| 63 | /* Get blocksize */ |
| 64 | extid >>= 2; |
| 65 | mtd->erasesize = (128 * 1024) << |
| 66 | (((extid >> 1) & 0x04) | (extid & 0x03)); |
| Michael Trimarchi | 2ee0a56 | 2022-07-25 12:20:24 +0200 | [diff] [blame] | 67 | |
| 68 | /* Extract ECC requirements from 5th id byte*/ |
| 69 | extid = (chip->id.data[4] >> 4) & 0x07; |
| 70 | if (extid < 5) { |
| 71 | chip->ecc_step_ds = 512; |
| 72 | chip->ecc_strength_ds = 1 << extid; |
| 73 | } else { |
| 74 | chip->ecc_step_ds = 1024; |
| 75 | switch (extid) { |
| 76 | case 5: |
| 77 | chip->ecc_strength_ds = 24; |
| 78 | break; |
| 79 | case 6: |
| 80 | chip->ecc_strength_ds = 40; |
| 81 | break; |
| 82 | case 7: |
| 83 | chip->ecc_strength_ds = 60; |
| 84 | break; |
| 85 | } |
| 86 | } |
| Michael Trimarchi | 6c8ef80 | 2022-07-20 18:22:09 +0200 | [diff] [blame] | 87 | } else { |
| 88 | nand_decode_ext_id(chip); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | static int samsung_nand_init(struct nand_chip *chip) |
| 93 | { |
| 94 | struct mtd_info *mtd = nand_to_mtd(chip); |
| 95 | |
| 96 | if (mtd->writesize > 512) |
| 97 | chip->options |= NAND_SAMSUNG_LP_OPTIONS; |
| 98 | |
| 99 | if (!nand_is_slc(chip)) |
| 100 | chip->bbt_options |= NAND_BBT_SCANLASTPAGE; |
| 101 | else |
| 102 | chip->bbt_options |= NAND_BBT_SCAN2NDPAGE; |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | const struct nand_manufacturer_ops samsung_nand_manuf_ops = { |
| 108 | .detect = samsung_nand_decode_id, |
| 109 | .init = samsung_nand_init, |
| 110 | }; |