forked from Minki/linux
d241979074
We don't handle cases larger than 7. We probably shouldn't pretend we
know the ECC step size in this case, and it's probably also good to
WARN() like we do in many other similar cases.
Fixes: 8fc82d456e ("mtd: nand: samsung: Retrieve ECC requirements from extended ID")
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
/*
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* Copyright (C) 2017 Free Electrons
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* Copyright (C) 2017 NextThing Co
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*
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* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/mtd/nand.h>
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static void samsung_nand_decode_id(struct nand_chip *chip)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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/* New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44) */
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if (chip->id.len == 6 && !nand_is_slc(chip) &&
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chip->id.data[5] != 0x00) {
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u8 extid = chip->id.data[3];
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/* Get pagesize */
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mtd->writesize = 2048 << (extid & 0x03);
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extid >>= 2;
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/* Get oobsize */
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switch (((extid >> 2) & 0x4) | (extid & 0x3)) {
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case 1:
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mtd->oobsize = 128;
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break;
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case 2:
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mtd->oobsize = 218;
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break;
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case 3:
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mtd->oobsize = 400;
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break;
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case 4:
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mtd->oobsize = 436;
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break;
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case 5:
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mtd->oobsize = 512;
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break;
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case 6:
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mtd->oobsize = 640;
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break;
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default:
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/*
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* We should never reach this case, but if that
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* happens, this probably means Samsung decided to use
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* a different extended ID format, and we should find
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* a way to support it.
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*/
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WARN(1, "Invalid OOB size value");
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break;
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}
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/* Get blocksize */
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extid >>= 2;
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mtd->erasesize = (128 * 1024) <<
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(((extid >> 1) & 0x04) | (extid & 0x03));
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/* Extract ECC requirements from 5th id byte*/
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extid = (chip->id.data[4] >> 4) & 0x07;
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if (extid < 5) {
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chip->ecc_step_ds = 512;
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chip->ecc_strength_ds = 1 << extid;
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} else {
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chip->ecc_step_ds = 1024;
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switch (extid) {
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case 5:
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chip->ecc_strength_ds = 24;
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break;
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case 6:
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chip->ecc_strength_ds = 40;
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break;
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case 7:
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chip->ecc_strength_ds = 60;
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break;
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default:
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WARN(1, "Could not decode ECC info");
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chip->ecc_step_ds = 0;
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}
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}
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} else {
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nand_decode_ext_id(chip);
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}
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}
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static int samsung_nand_init(struct nand_chip *chip)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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if (mtd->writesize > 512)
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chip->options |= NAND_SAMSUNG_LP_OPTIONS;
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if (!nand_is_slc(chip))
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chip->bbt_options |= NAND_BBT_SCANLASTPAGE;
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else
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chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
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return 0;
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}
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const struct nand_manufacturer_ops samsung_nand_manuf_ops = {
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.detect = samsung_nand_decode_id,
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.init = samsung_nand_init,
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};
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