Release 4.18 drivers/mtd/nand/raw/nand_samsung.c
/*
* 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/rawnand.h>
static void samsung_nand_decode_id(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
/* 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];
/* Get pagesize */
mtd->writesize = 2048 << (extid & 0x03);
extid >>= 2;
/* 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));
/* Extract ECC requirements from 5th id byte*/
extid = (chip->id.data[4] >> 4) & 0x07;
if (extid < 5) {
chip->ecc_step_ds = 512;
chip->ecc_strength_ds = 1 << extid;
} else {
chip->ecc_step_ds = 1024;
switch (extid) {
case 5:
chip->ecc_strength_ds = 24;
break;
case 6:
chip->ecc_strength_ds = 40;
break;
case 7:
chip->ecc_strength_ds = 60;
break;
default:
WARN(1, "Could not decode ECC info");
chip->ecc_step_ds = 0;
}
}
} else {
nand_decode_ext_id(chip);
if (nand_is_slc(chip)) {
switch (chip->id.data[1]) {
/* K9F4G08U0D-S[I|C]B0(T00) */
case 0xDC:
chip->ecc_step_ds = 512;
chip->ecc_strength_ds = 1;
break;
/* K9F1G08U0E 21nm chips do not support subpage write */
case 0xF1:
if (chip->id.len > 4 &&
(chip->id.data[4] & GENMASK(1, 0)) == 0x1)
chip->options |= NAND_NO_SUBPAGE_WRITE;
break;
default:
break;
}
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Boris Brezillon | 212 | 53.94% | 1 | 20.00% |
| Hans de Goede | 85 | 21.63% | 1 | 20.00% |
| Ladislav Michl | 53 | 13.49% | 1 | 20.00% |
| Miquel Raynal | 29 | 7.38% | 1 | 20.00% |
| Brian Norris | 14 | 3.56% | 1 | 20.00% |
| Total | 393 | 100.00% | 5 | 100.00% |
static int samsung_nand_init(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
if (mtd->writesize > 512)
chip->options |= NAND_SAMSUNG_LP_OPTIONS;
if (!nand_is_slc(chip))
chip->bbt_options |= NAND_BBT_SCANLASTPAGE;
else
chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Boris Brezillon | 59 | 100.00% | 1 | 100.00% |
| Total | 59 | 100.00% | 1 | 100.00% |
const struct nand_manufacturer_ops samsung_nand_manuf_ops = {
.detect = samsung_nand_decode_id,
.init = samsung_nand_init,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Boris Brezillon | 292 | 61.73% | 2 | 33.33% |
| Hans de Goede | 85 | 17.97% | 1 | 16.67% |
| Ladislav Michl | 53 | 11.21% | 1 | 16.67% |
| Miquel Raynal | 29 | 6.13% | 1 | 16.67% |
| Brian Norris | 14 | 2.96% | 1 | 16.67% |
| Total | 473 | 100.00% | 6 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.