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mtd: nand: Move Samsung specific init/detection logic in nand_samsung.c
Move Samsung specific initialization and detection logic into nand_samsung.c. This is part of the "separate vendor specific code from core" cleanup process. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Acked-by: Richard Weinberger <richard@nod.at>
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Boris Brezillon
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Mar 8, 2017
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| /* | ||
| * Copyright (C) 2017 Free Electrons | ||
| * Copyright (C) 2017 NextThing Co | ||
| * | ||
| * Author: Boris Brezillon <boris.brezillon@free-electrons.com> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; either version 2 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| */ | ||
|
|
||
| #include <linux/mtd/nand.h> | ||
|
|
||
| static void samsung_nand_decode_id(struct nand_chip *chip) | ||
| { | ||
| struct mtd_info *mtd = nand_to_mtd(chip); | ||
|
|
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| /* New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44) */ | ||
| if (chip->id.len == 6 && !nand_is_slc(chip) && | ||
| chip->id.data[5] != 0x00) { | ||
| u8 extid = chip->id.data[3]; | ||
|
|
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| /* Get pagesize */ | ||
| mtd->writesize = 2048 << (extid & 0x03); | ||
|
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| extid >>= 2; | ||
|
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| /* Get oobsize */ | ||
| switch (((extid >> 2) & 0x4) | (extid & 0x3)) { | ||
| case 1: | ||
| mtd->oobsize = 128; | ||
| break; | ||
| case 2: | ||
| mtd->oobsize = 218; | ||
| break; | ||
| case 3: | ||
| mtd->oobsize = 400; | ||
| break; | ||
| case 4: | ||
| mtd->oobsize = 436; | ||
| break; | ||
| case 5: | ||
| mtd->oobsize = 512; | ||
| break; | ||
| case 6: | ||
| mtd->oobsize = 640; | ||
| break; | ||
| default: | ||
| /* | ||
| * We should never reach this case, but if that | ||
| * happens, this probably means Samsung decided to use | ||
| * a different extended ID format, and we should find | ||
| * a way to support it. | ||
| */ | ||
| WARN(1, "Invalid OOB size value"); | ||
| break; | ||
| } | ||
|
|
||
| /* Get blocksize */ | ||
| extid >>= 2; | ||
| mtd->erasesize = (128 * 1024) << | ||
| (((extid >> 1) & 0x04) | (extid & 0x03)); | ||
| } else { | ||
| nand_decode_ext_id(chip); | ||
| } | ||
| } | ||
|
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| static int samsung_nand_init(struct nand_chip *chip) | ||
| { | ||
| struct mtd_info *mtd = nand_to_mtd(chip); | ||
|
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| if (mtd->writesize > 512) | ||
| chip->options |= NAND_SAMSUNG_LP_OPTIONS; | ||
|
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| if (!nand_is_slc(chip)) | ||
| chip->bbt_options |= NAND_BBT_SCANLASTPAGE; | ||
| else | ||
| chip->bbt_options |= NAND_BBT_SCAN2NDPAGE; | ||
|
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| return 0; | ||
| } | ||
|
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| const struct nand_manufacturer_ops samsung_nand_manuf_ops = { | ||
| .detect = samsung_nand_decode_id, | ||
| .init = samsung_nand_init, | ||
| }; |
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