projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| c51d0ac5 BB |
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)); | |
| 8fc82d45 HG |
69 | |
| 70 | /* Extract ECC requirements from 5th id byte*/ | |
| 71 | extid = (chip->id.data[4] >> 4) & 0x07; | |
| 72 | if (extid < 5) { | |
| 73 | chip->ecc_step_ds = 512; | |
| 74 | chip->ecc_strength_ds = 1 << extid; | |
| 75 | } else { | |
| 76 | chip->ecc_step_ds = 1024; | |
| 77 | switch (extid) { | |
| 78 | case 5: | |
| 79 | chip->ecc_strength_ds = 24; | |
| 80 | break; | |
| 81 | case 6: | |
| 82 | chip->ecc_strength_ds = 40; | |
| 83 | break; | |
| 84 | case 7: | |
| 85 | chip->ecc_strength_ds = 60; | |
| 86 | break; | |
| d2419790 BN |
87 | default: |
| 88 | WARN(1, "Could not decode ECC info"); | |
| 89 | chip->ecc_step_ds = 0; | |
| 8fc82d45 HG |
90 | } |
| 91 | } | |
| c51d0ac5 BB |
92 | } else { |
| 93 | nand_decode_ext_id(chip); | |
| 94 | } | |
| 95 | } | |
| 96 | ||
| 97 | static int samsung_nand_init(struct nand_chip *chip) | |
| 98 | { | |
| 99 | struct mtd_info *mtd = nand_to_mtd(chip); | |
| 100 | ||
| 101 | if (mtd->writesize > 512) | |
| 102 | chip->options |= NAND_SAMSUNG_LP_OPTIONS; | |
| 103 | ||
| 104 | if (!nand_is_slc(chip)) | |
| 105 | chip->bbt_options |= NAND_BBT_SCANLASTPAGE; | |
| 106 | else | |
| 107 | chip->bbt_options |= NAND_BBT_SCAN2NDPAGE; | |
| 108 | ||
| 109 | return 0; | |
| 110 | } | |
| 111 | ||
| 112 | const struct nand_manufacturer_ops samsung_nand_manuf_ops = { | |
| 113 | .detect = samsung_nand_decode_id, | |
| 114 | .init = samsung_nand_init, | |
| 115 | }; |