1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2017 Free Electrons
4 * Copyright (C) 2017 NextThing Co
6 * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
11 static void samsung_nand_decode_id(struct nand_chip *chip)
13 struct nand_device *base = &chip->base;
14 struct nand_ecc_props requirements = {};
15 struct mtd_info *mtd = nand_to_mtd(chip);
16 struct nand_memory_organization *memorg;
18 memorg = nanddev_get_memorg(&chip->base);
20 /* New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44) */
21 if (chip->id.len == 6 && !nand_is_slc(chip) &&
22 chip->id.data[5] != 0x00) {
23 u8 extid = chip->id.data[3];
26 memorg->pagesize = 2048 << (extid & 0x03);
27 mtd->writesize = memorg->pagesize;
32 switch (((extid >> 2) & 0x4) | (extid & 0x3)) {
34 memorg->oobsize = 128;
37 memorg->oobsize = 218;
40 memorg->oobsize = 400;
43 memorg->oobsize = 436;
46 memorg->oobsize = 512;
49 memorg->oobsize = 640;
53 * We should never reach this case, but if that
54 * happens, this probably means Samsung decided to use
55 * a different extended ID format, and we should find
56 * a way to support it.
58 WARN(1, "Invalid OOB size value");
62 mtd->oobsize = memorg->oobsize;
66 memorg->pages_per_eraseblock = (128 * 1024) <<
67 (((extid >> 1) & 0x04) |
70 mtd->erasesize = (128 * 1024) <<
71 (((extid >> 1) & 0x04) | (extid & 0x03));
73 /* Extract ECC requirements from 5th id byte*/
74 extid = (chip->id.data[4] >> 4) & 0x07;
76 requirements.step_size = 512;
77 requirements.strength = 1 << extid;
79 requirements.step_size = 1024;
82 requirements.strength = 24;
85 requirements.strength = 40;
88 requirements.strength = 60;
91 WARN(1, "Could not decode ECC info");
92 requirements.step_size = 0;
96 nand_decode_ext_id(chip);
98 if (nand_is_slc(chip)) {
99 switch (chip->id.data[1]) {
100 /* K9F4G08U0D-S[I|C]B0(T00) */
102 requirements.step_size = 512;
103 requirements.strength = 1;
106 /* K9F1G08U0E 21nm chips do not support subpage write */
108 if (chip->id.len > 4 &&
109 (chip->id.data[4] & GENMASK(1, 0)) == 0x1)
110 chip->options |= NAND_NO_SUBPAGE_WRITE;
118 nanddev_set_ecc_requirements(base, &requirements);
121 static int samsung_nand_init(struct nand_chip *chip)
123 struct mtd_info *mtd = nand_to_mtd(chip);
125 if (mtd->writesize > 512)
126 chip->options |= NAND_SAMSUNG_LP_OPTIONS;
128 if (!nand_is_slc(chip))
129 chip->options |= NAND_BBM_LASTPAGE;
131 chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
136 const struct nand_manufacturer_ops samsung_nand_manuf_ops = {
137 .detect = samsung_nand_decode_id,
138 .init = samsung_nand_init,