drivers/mtd/nand/raw/nand_macronix.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 /*
  21  * Macronix AC series does not support using SET/GET_FEATURES to change
  22  * the timings unlike what is declared in the parameter page. Unflag
  23  * this feature to avoid unnecessary downturns.
  24  */
  25 static void macronix_nand_fix_broken_get_timings(struct nand_chip *chip)
  26 {
  27         unsigned int i;
  28         static const char * const broken_get_timings[] = {
  29                 "MX30LF1G18AC",
  30                 "MX30LF1G28AC",
  31                 "MX30LF2G18AC",
  32                 "MX30LF2G28AC",
  33                 "MX30LF4G18AC",
  34                 "MX30LF4G28AC",
  35                 "MX60LF8G18AC",
  36         };
  37
  38         if (!chip->parameters.supports_set_get_features)
  39                 return;
  40
  41         for (i = 0; i < ARRAY_SIZE(broken_get_timings); i++) {
  42                 if (!strcmp(broken_get_timings[i], chip->parameters.model))
  43                         break;
  44         }
  45
  46         if (i == ARRAY_SIZE(broken_get_timings))
  47                 return;
  48
  49         bitmap_clear(chip->parameters.get_feature_list,
  50                      ONFI_FEATURE_ADDR_TIMING_MODE, 1);
  51         bitmap_clear(chip->parameters.set_feature_list,
  52                      ONFI_FEATURE_ADDR_TIMING_MODE, 1);
  53 }
  54
  55 static int macronix_nand_init(struct nand_chip *chip)
  56 {
  57         if (nand_is_slc(chip))
  58                 chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
  59
  60         macronix_nand_fix_broken_get_timings(chip);
  61
  62         return 0;
  63 }
  64
  65 const struct nand_manufacturer_ops macronix_nand_manuf_ops = {
  66         .init = macronix_nand_init,
  67 };