drivers/mtd/nand/raw/nand_samsung.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2017 Free Electrons
   4  * Copyright (C) 2017 NextThing Co
   5  *
   6  * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
   7  */
   8
   9 #include "internals.h"
  10
  11 static void samsung_nand_decode_id(struct nand_chip *chip)
  12 {
  13         struct nand_device *base = &chip->base;
  14         struct nand_ecc_props requirements = {};
  15         struct mtd_info *mtd = nand_to_mtd(chip);
  16         struct nand_memory_organization *memorg;
  17
  18         memorg = nanddev_get_memorg(&chip->base);
  19
  20         /* New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44) */
  21         if (chip->id.len == 6 && !nand_is_slc(chip) &&
  22             chip->id.data[5] != 0x00) {
  23                 u8 extid = chip->id.data[3];
  24
  25                 /* Get pagesize */
  26                 memorg->pagesize = 2048 << (extid & 0x03);
  27                 mtd->writesize = memorg->pagesize;
  28
  29                 extid >>= 2;
  30
  31                 /* Get oobsize */
  32                 switch (((extid >> 2) & 0x4) | (extid & 0x3)) {
  33                 case 1:
  34                         memorg->oobsize = 128;
  35                         break;
  36                 case 2:
  37                         memorg->oobsize = 218;
  38                         break;
  39                 case 3:
  40                         memorg->oobsize = 400;
  41                         break;
  42                 case 4:
  43                         memorg->oobsize = 436;
  44                         break;
  45                 case 5:
  46                         memorg->oobsize = 512;
  47                         break;
  48                 case 6:
  49                         memorg->oobsize = 640;
  50                         break;
  51                 default:
  52                         /*
  53                          * We should never reach this case, but if that
  54                          * happens, this probably means Samsung decided to use
  55                          * a different extended ID format, and we should find
  56                          * a way to support it.
  57                          */
  58                         WARN(1, "Invalid OOB size value");
  59                         break;
  60                 }
  61
  62                 mtd->oobsize = memorg->oobsize;
  63
  64                 /* Get blocksize */
  65                 extid >>= 2;
  66                 memorg->pages_per_eraseblock = (128 * 1024) <<
  67                                                (((extid >> 1) & 0x04) |
  68                                                 (extid & 0x03)) /
  69                                                memorg->pagesize;
  70                 mtd->erasesize = (128 * 1024) <<
  71                                  (((extid >> 1) & 0x04) | (extid & 0x03));
  72
  73                 /* Extract ECC requirements from 5th id byte*/
  74                 extid = (chip->id.data[4] >> 4) & 0x07;
  75                 if (extid < 5) {
  76                         requirements.step_size = 512;
  77                         requirements.strength = 1 << extid;
  78                 } else {
  79                         requirements.step_size = 1024;
  80                         switch (extid) {
  81                         case 5:
  82                                 requirements.strength = 24;
  83                                 break;
  84                         case 6:
  85                                 requirements.strength = 40;
  86                                 break;
  87                         case 7:
  88                                 requirements.strength = 60;
  89                                 break;
  90                         default:
  91                                 WARN(1, "Could not decode ECC info");
  92                                 requirements.step_size = 0;
  93                         }
  94                 }
  95         } else {
  96                 nand_decode_ext_id(chip);
  97
  98                 if (nand_is_slc(chip)) {
  99                         switch (chip->id.data[1]) {
 100                         /* K9F4G08U0D-S[I|C]B0(T00) */
 101                         case 0xDC:
 102                                 requirements.step_size = 512;
 103                                 requirements.strength = 1;
 104                                 break;
 105
 106                         /* K9F1G08U0E 21nm chips do not support subpage write */
 107                         case 0xF1:
 108                                 if (chip->id.len > 4 &&
 109                                     (chip->id.data[4] & GENMASK(1, 0)) == 0x1)
 110                                         chip->options |= NAND_NO_SUBPAGE_WRITE;
 111                                 break;
 112                         default:
 113                                 break;
 114                         }
 115                 }
 116         }
 117
 118         nanddev_set_ecc_requirements(base, &requirements);
 119 }
 120
 121 static int samsung_nand_init(struct nand_chip *chip)
 122 {
 123         struct mtd_info *mtd = nand_to_mtd(chip);
 124
 125         if (mtd->writesize > 512)
 126                 chip->options |= NAND_SAMSUNG_LP_OPTIONS;
 127
 128         if (!nand_is_slc(chip))
 129                 chip->options |= NAND_BBM_LASTPAGE;
 130         else
 131                 chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
 132
 133         return 0;
 134 }
 135
 136 const struct nand_manufacturer_ops samsung_nand_manuf_ops = {
 137         .detect = samsung_nand_decode_id,
 138         .init = samsung_nand_init,
 139 };