root/drivers/mtd/nand/spi/toshiba.c

DEFINITIONS

1. tc58cxgxsx_ooblayout_ecc
2. tc58cxgxsx_ooblayout_free
3. tc58cxgxsx_ecc_get_status
4. toshiba_spinand_detect

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018 exceet electronics GmbH
   4  * Copyright (c) 2018 Kontron Electronics GmbH
   5  *
   6  * Author: Frieder Schrempf <frieder.schrempf@kontron.de>
   7  */
   8 
   9 #include <linux/device.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mtd/spinand.h>
  12 
  13 #define SPINAND_MFR_TOSHIBA             0x98
  14 #define TOSH_STATUS_ECC_HAS_BITFLIPS_T  (3 << 4)
  15 
  16 static SPINAND_OP_VARIANTS(read_cache_variants,
  17                 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
  18                 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
  19                 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
  20                 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
  21 
  22 static SPINAND_OP_VARIANTS(write_cache_variants,
  23                 SPINAND_PROG_LOAD(true, 0, NULL, 0));
  24 
  25 static SPINAND_OP_VARIANTS(update_cache_variants,
  26                 SPINAND_PROG_LOAD(false, 0, NULL, 0));
  27 
  28 static int tc58cxgxsx_ooblayout_ecc(struct mtd_info *mtd, int section,
  29                                      struct mtd_oob_region *region)
  30 {
  31         if (section > 0)
  32                 return -ERANGE;
  33 
  34         region->offset = mtd->oobsize / 2;
  35         region->length = mtd->oobsize / 2;
  36 
  37         return 0;
  38 }
  39 
  40 static int tc58cxgxsx_ooblayout_free(struct mtd_info *mtd, int section,
  41                                       struct mtd_oob_region *region)
  42 {
  43         if (section > 0)
  44                 return -ERANGE;
  45 
  46         /* 2 bytes reserved for BBM */
  47         region->offset = 2;
  48         region->length = (mtd->oobsize / 2) - 2;
  49 
  50         return 0;
  51 }
  52 
  53 static const struct mtd_ooblayout_ops tc58cxgxsx_ooblayout = {
  54         .ecc = tc58cxgxsx_ooblayout_ecc,
  55         .free = tc58cxgxsx_ooblayout_free,
  56 };
  57 
  58 static int tc58cxgxsx_ecc_get_status(struct spinand_device *spinand,
  59                                       u8 status)
  60 {
  61         struct nand_device *nand = spinand_to_nand(spinand);
  62         u8 mbf = 0;
  63         struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &mbf);
  64 
  65         switch (status & STATUS_ECC_MASK) {
  66         case STATUS_ECC_NO_BITFLIPS:
  67                 return 0;
  68 
  69         case STATUS_ECC_UNCOR_ERROR:
  70                 return -EBADMSG;
  71 
  72         case STATUS_ECC_HAS_BITFLIPS:
  73         case TOSH_STATUS_ECC_HAS_BITFLIPS_T:
  74                 /*
  75                  * Let's try to retrieve the real maximum number of bitflips
  76                  * in order to avoid forcing the wear-leveling layer to move
  77                  * data around if it's not necessary.
  78                  */
  79                 if (spi_mem_exec_op(spinand->spimem, &op))
  80                         return nand->eccreq.strength;
  81 
  82                 mbf >>= 4;
  83 
  84                 if (WARN_ON(mbf > nand->eccreq.strength || !mbf))
  85                         return nand->eccreq.strength;
  86 
  87                 return mbf;
  88 
  89         default:
  90                 break;
  91         }
  92 
  93         return -EINVAL;
  94 }
  95 
  96 static const struct spinand_info toshiba_spinand_table[] = {
  97         /* 3.3V 1Gb */
  98         SPINAND_INFO("TC58CVG0S3", 0xC2,
  99                      NAND_MEMORG(1, 2048, 128, 64, 1024, 20, 1, 1, 1),
 100                      NAND_ECCREQ(8, 512),
 101                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
 102                                               &write_cache_variants,
 103                                               &update_cache_variants),
 104                      0,
 105                      SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
 106                                      tc58cxgxsx_ecc_get_status)),
 107         /* 3.3V 2Gb */
 108         SPINAND_INFO("TC58CVG1S3", 0xCB,
 109                      NAND_MEMORG(1, 2048, 128, 64, 2048, 40, 1, 1, 1),
 110                      NAND_ECCREQ(8, 512),
 111                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
 112                                               &write_cache_variants,
 113                                               &update_cache_variants),
 114                      0,
 115                      SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
 116                                      tc58cxgxsx_ecc_get_status)),
 117         /* 3.3V 4Gb */
 118         SPINAND_INFO("TC58CVG2S0", 0xCD,
 119                      NAND_MEMORG(1, 4096, 256, 64, 2048, 40, 1, 1, 1),
 120                      NAND_ECCREQ(8, 512),
 121                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
 122                                               &write_cache_variants,
 123                                               &update_cache_variants),
 124                      0,
 125                      SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
 126                                      tc58cxgxsx_ecc_get_status)),
 127         /* 1.8V 1Gb */
 128         SPINAND_INFO("TC58CYG0S3", 0xB2,
 129                      NAND_MEMORG(1, 2048, 128, 64, 1024, 20, 1, 1, 1),
 130                      NAND_ECCREQ(8, 512),
 131                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
 132                                               &write_cache_variants,
 133                                               &update_cache_variants),
 134                      0,
 135                      SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
 136                                      tc58cxgxsx_ecc_get_status)),
 137         /* 1.8V 2Gb */
 138         SPINAND_INFO("TC58CYG1S3", 0xBB,
 139                      NAND_MEMORG(1, 2048, 128, 64, 2048, 40, 1, 1, 1),
 140                      NAND_ECCREQ(8, 512),
 141                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
 142                                               &write_cache_variants,
 143                                               &update_cache_variants),
 144                      0,
 145                      SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
 146                                      tc58cxgxsx_ecc_get_status)),
 147         /* 1.8V 4Gb */
 148         SPINAND_INFO("TC58CYG2S0", 0xBD,
 149                      NAND_MEMORG(1, 4096, 256, 64, 2048, 40, 1, 1, 1),
 150                      NAND_ECCREQ(8, 512),
 151                      SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
 152                                               &write_cache_variants,
 153                                               &update_cache_variants),
 154                      0,
 155                      SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
 156                                      tc58cxgxsx_ecc_get_status)),
 157 };
 158 
 159 static int toshiba_spinand_detect(struct spinand_device *spinand)
 160 {
 161         u8 *id = spinand->id.data;
 162         int ret;
 163 
 164         /*
 165          * Toshiba SPI NAND read ID needs a dummy byte,
 166          * so the first byte in id is garbage.
 167          */
 168         if (id[1] != SPINAND_MFR_TOSHIBA)
 169                 return 0;
 170 
 171         ret = spinand_match_and_init(spinand, toshiba_spinand_table,
 172                                      ARRAY_SIZE(toshiba_spinand_table),
 173                                      id[2]);
 174         if (ret)
 175                 return ret;
 176 
 177         return 1;
 178 }
 179 
 180 static const struct spinand_manufacturer_ops toshiba_spinand_manuf_ops = {
 181         .detect = toshiba_spinand_detect,
 182 };
 183 
 184 const struct spinand_manufacturer toshiba_spinand_manufacturer = {
 185         .id = SPINAND_MFR_TOSHIBA,
 186         .name = "Toshiba",
 187         .ops = &toshiba_spinand_manuf_ops,
 188 };