drivers/mtd/nand/nand_micron.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/nand.h>
  19
  20 struct nand_onfi_vendor_micron {
  21         u8 two_plane_read;
  22         u8 read_cache;
  23         u8 read_unique_id;
  24         u8 dq_imped;
  25         u8 dq_imped_num_settings;
  26         u8 dq_imped_feat_addr;
  27         u8 rb_pulldown_strength;
  28         u8 rb_pulldown_strength_feat_addr;
  29         u8 rb_pulldown_strength_num_settings;
  30         u8 otp_mode;
  31         u8 otp_page_start;
  32         u8 otp_data_prot_addr;
  33         u8 otp_num_pages;
  34         u8 otp_feat_addr;
  35         u8 read_retry_options;
  36         u8 reserved[72];
  37         u8 param_revision;
  38 } __packed;
  39
  40 static int micron_nand_setup_read_retry(struct mtd_info *mtd, int retry_mode)
  41 {
  42         struct nand_chip *chip = mtd_to_nand(mtd);
  43         u8 feature[ONFI_SUBFEATURE_PARAM_LEN] = {retry_mode};
  44
  45         return chip->onfi_set_features(mtd, chip, ONFI_FEATURE_ADDR_READ_RETRY,
  46                                        feature);
  47 }
  48
  49 /*
  50  * Configure chip properties from Micron vendor-specific ONFI table
  51  */
  52 static int micron_nand_onfi_init(struct nand_chip *chip)
  53 {
  54         struct nand_onfi_params *p = &chip->onfi_params;
  55         struct nand_onfi_vendor_micron *micron = (void *)p->vendor;
  56
  57         if (!chip->onfi_version)
  58                 return 0;
  59
  60         if (le16_to_cpu(p->vendor_revision) < 1)
  61                 return 0;
  62
  63         chip->read_retries = micron->read_retry_options;
  64         chip->setup_read_retry = micron_nand_setup_read_retry;
  65
  66         return 0;
  67 }
  68
  69 static int micron_nand_init(struct nand_chip *chip)
  70 {
  71         struct mtd_info *mtd = nand_to_mtd(chip);
  72         int ret;
  73
  74         ret = micron_nand_onfi_init(chip);
  75         if (ret)
  76                 return ret;
  77
  78         if (mtd->writesize == 2048)
  79                 chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
  80
  81         return 0;
  82 }
  83
  84 const struct nand_manufacturer_ops micron_nand_manuf_ops = {
  85         .init = micron_nand_init,
  86 };