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
  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 */
  25static 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
  55static 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
  65const struct nand_manufacturer_ops macronix_nand_manuf_ops = {
  66        .init = macronix_nand_init,
  67};
  68