| Boris Brezillon | c51d0ac | 2016-06-08 10:22:19 +0200 | [diff] [blame^] | 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 samsung_nand_decode_id(struct nand_chip *chip) |
| 21 | { |
| 22 | struct mtd_info *mtd = nand_to_mtd(chip); |
| 23 | |
| 24 | /* New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44) */ |
| 25 | if (chip->id.len == 6 && !nand_is_slc(chip) && |
| 26 | chip->id.data[5] != 0x00) { |
| 27 | u8 extid = chip->id.data[3]; |
| 28 | |
| 29 | /* Get pagesize */ |
| 30 | mtd->writesize = 2048 << (extid & 0x03); |
| 31 | |
| 32 | extid >>= 2; |
| 33 | |
| 34 | /* Get oobsize */ |
| 35 | switch (((extid >> 2) & 0x4) | (extid & 0x3)) { |
| 36 | case 1: |
| 37 | mtd->oobsize = 128; |
| 38 | break; |
| 39 | case 2: |
| 40 | mtd->oobsize = 218; |
| 41 | break; |
| 42 | case 3: |
| 43 | mtd->oobsize = 400; |
| 44 | break; |
| 45 | case 4: |
| 46 | mtd->oobsize = 436; |
| 47 | break; |
| 48 | case 5: |
| 49 | mtd->oobsize = 512; |
| 50 | break; |
| 51 | case 6: |
| 52 | mtd->oobsize = 640; |
| 53 | break; |
| 54 | default: |
| 55 | /* |
| 56 | * We should never reach this case, but if that |
| 57 | * happens, this probably means Samsung decided to use |
| 58 | * a different extended ID format, and we should find |
| 59 | * a way to support it. |
| 60 | */ |
| 61 | WARN(1, "Invalid OOB size value"); |
| 62 | break; |
| 63 | } |
| 64 | |
| 65 | /* Get blocksize */ |
| 66 | extid >>= 2; |
| 67 | mtd->erasesize = (128 * 1024) << |
| 68 | (((extid >> 1) & 0x04) | (extid & 0x03)); |
| 69 | } else { |
| 70 | nand_decode_ext_id(chip); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | static int samsung_nand_init(struct nand_chip *chip) |
| 75 | { |
| 76 | struct mtd_info *mtd = nand_to_mtd(chip); |
| 77 | |
| 78 | if (mtd->writesize > 512) |
| 79 | chip->options |= NAND_SAMSUNG_LP_OPTIONS; |
| 80 | |
| 81 | if (!nand_is_slc(chip)) |
| 82 | chip->bbt_options |= NAND_BBT_SCANLASTPAGE; |
| 83 | else |
| 84 | chip->bbt_options |= NAND_BBT_SCAN2NDPAGE; |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | const struct nand_manufacturer_ops samsung_nand_manuf_ops = { |
| 90 | .detect = samsung_nand_decode_id, |
| 91 | .init = samsung_nand_init, |
| 92 | }; |