drivers/mtd/nand/nand_amd.c

   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
  20 static 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
  40 static 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
  48 const struct nand_manufacturer_ops amd_nand_manuf_ops = {
  49         .detect = amd_nand_decode_id,
  50         .init = amd_nand_init,
  51 };