LXR linux/drivers/mtd/nand/raw/nand

   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/rawnand.h>
  19
  20static void amd_nand_decode_id(struct nand_chip *chip)
  21{
  22        struct mtd_info *mtd = nand_to_mtd(chip);
  23
  24        nand_decode_ext_id(chip);
  25
  26        /*
  27         * Check for Spansion/AMD ID + repeating 5th, 6th byte since
  28         * some Spansion chips have erasesize that conflicts with size
  29         * listed in nand_ids table.
  30         * Data sheet (5 byte ID): Spansion S30ML-P ORNAND (p.39)
  31         */
  32        if (chip->id.data[4] != 0x00 && chip->id.data[5] == 0x00 &&
  33            chip->id.data[6] == 0x00 && chip->id.data[7] == 0x00 &&
  34            mtd->writesize == 512) {
  35                mtd->erasesize = 128 * 1024;
  36                mtd->erasesize <<= ((chip->id.data[3] & 0x03) << 1);
  37        }
  38}
  39
  40static int amd_nand_init(struct nand_chip *chip)
  41{
  42        if (nand_is_slc(chip))
  43                chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
  44
  45        return 0;
  46}
  47
  48const struct nand_manufacturer_ops amd_nand_manuf_ops = {
  49        .detect = amd_nand_decode_id,
  50        .init = amd_nand_init,
  51};
  52