git.openwrt.org Git - openwrt/staging/svanheule.git/blob

   1 From 10949af1681d5bb5cdbcc012815c6e40eec17d02 Mon Sep 17 00:00:00 2001
   2 From: Schrempf Frieder <frieder.schrempf@kontron.De>
   3 Date: Thu, 8 Nov 2018 08:32:11 +0000
   4 Subject: [PATCH 2/8] mtd: spinand: Add initial support for Toshiba TC58CVG2S0H
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Add minimal support for the Toshiba TC58CVG2S0H SPI NAND chip.
  10
  11 Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
  12 Acked-by: Clément Péron <peron.clem@gmail.com>
  13 Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
  14 ---
  15  drivers/mtd/nand/spi/Makefile  |   2 +-
  16  drivers/mtd/nand/spi/core.c    |   1 +
  17  drivers/mtd/nand/spi/toshiba.c | 137 +++++++++++++++++++++++++++++++++
  18  include/linux/mtd/spinand.h    |   1 +
  19  4 files changed, 140 insertions(+), 1 deletion(-)
  20  create mode 100644 drivers/mtd/nand/spi/toshiba.c
  21
  22 --- a/drivers/mtd/nand/spi/Makefile
  23 +++ b/drivers/mtd/nand/spi/Makefile
  24 @@ -1,3 +1,3 @@
  25  # SPDX-License-Identifier: GPL-2.0
  26 -spinand-objs := core.o macronix.o micron.o winbond.o
  27 +spinand-objs := core.o macronix.o micron.o toshiba.o winbond.o
  28  obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
  29 --- a/drivers/mtd/nand/spi/core.c
  30 +++ b/drivers/mtd/nand/spi/core.c
  31 @@ -764,6 +764,7 @@ static const struct nand_ops spinand_ops
  32  static const struct spinand_manufacturer *spinand_manufacturers[] = {
  33         &macronix_spinand_manufacturer,
  34         &micron_spinand_manufacturer,
  35 +       &toshiba_spinand_manufacturer,
  36         &winbond_spinand_manufacturer,
  37  };
  38
  39 --- /dev/null
  40 +++ b/drivers/mtd/nand/spi/toshiba.c
  41 @@ -0,0 +1,137 @@
  42 +// SPDX-License-Identifier: GPL-2.0
  43 +/*
  44 + * Copyright (c) 2018 exceet electronics GmbH
  45 + * Copyright (c) 2018 Kontron Electronics GmbH
  46 + *
  47 + * Author: Frieder Schrempf <frieder.schrempf@kontron.de>
  48 + */
  49 +
  50 +#include <linux/device.h>
  51 +#include <linux/kernel.h>
  52 +#include <linux/mtd/spinand.h>
  53 +
  54 +#define SPINAND_MFR_TOSHIBA            0x98
  55 +#define TOSH_STATUS_ECC_HAS_BITFLIPS_T (3 << 4)
  56 +
  57 +static SPINAND_OP_VARIANTS(read_cache_variants,
  58 +               SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
  59 +               SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
  60 +               SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
  61 +               SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
  62 +
  63 +static SPINAND_OP_VARIANTS(write_cache_variants,
  64 +               SPINAND_PROG_LOAD(true, 0, NULL, 0));
  65 +
  66 +static SPINAND_OP_VARIANTS(update_cache_variants,
  67 +               SPINAND_PROG_LOAD(false, 0, NULL, 0));
  68 +
  69 +static int tc58cvg2s0h_ooblayout_ecc(struct mtd_info *mtd, int section,
  70 +                                    struct mtd_oob_region *region)
  71 +{
  72 +       if (section > 7)
  73 +               return -ERANGE;
  74 +
  75 +       region->offset = 128 + 16 * section;
  76 +       region->length = 16;
  77 +
  78 +       return 0;
  79 +}
  80 +
  81 +static int tc58cvg2s0h_ooblayout_free(struct mtd_info *mtd, int section,
  82 +                                     struct mtd_oob_region *region)
  83 +{
  84 +       if (section > 0)
  85 +               return -ERANGE;
  86 +
  87 +       /* 2 bytes reserved for BBM */
  88 +       region->offset = 2;
  89 +       region->length = 126;
  90 +
  91 +       return 0;
  92 +}
  93 +
  94 +static const struct mtd_ooblayout_ops tc58cvg2s0h_ooblayout = {
  95 +       .ecc = tc58cvg2s0h_ooblayout_ecc,
  96 +       .free = tc58cvg2s0h_ooblayout_free,
  97 +};
  98 +
  99 +static int tc58cvg2s0h_ecc_get_status(struct spinand_device *spinand,
 100 +                                     u8 status)
 101 +{
 102 +       struct nand_device *nand = spinand_to_nand(spinand);
 103 +       u8 mbf = 0;
 104 +       struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &mbf);
 105 +
 106 +       switch (status & STATUS_ECC_MASK) {
 107 +       case STATUS_ECC_NO_BITFLIPS:
 108 +               return 0;
 109 +
 110 +       case STATUS_ECC_UNCOR_ERROR:
 111 +               return -EBADMSG;
 112 +
 113 +       case STATUS_ECC_HAS_BITFLIPS:
 114 +       case TOSH_STATUS_ECC_HAS_BITFLIPS_T:
 115 +               /*
 116 +                * Let's try to retrieve the real maximum number of bitflips
 117 +                * in order to avoid forcing the wear-leveling layer to move
 118 +                * data around if it's not necessary.
 119 +                */
 120 +               if (spi_mem_exec_op(spinand->spimem, &op))
 121 +                       return nand->eccreq.strength;
 122 +
 123 +               mbf >>= 4;
 124 +
 125 +               if (WARN_ON(mbf > nand->eccreq.strength || !mbf))
 126 +                       return nand->eccreq.strength;
 127 +
 128 +               return mbf;
 129 +
 130 +       default:
 131 +               break;
 132 +       }
 133 +
 134 +       return -EINVAL;
 135 +}
 136 +
 137 +static const struct spinand_info toshiba_spinand_table[] = {
 138 +       SPINAND_INFO("TC58CVG2S0H", 0xCD,
 139 +                    NAND_MEMORG(1, 4096, 256, 64, 2048, 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 +                    SPINAND_HAS_QE_BIT,
 145 +                    SPINAND_ECCINFO(&tc58cvg2s0h_ooblayout,
 146 +                                    tc58cvg2s0h_ecc_get_status)),
 147 +};
 148 +
 149 +static int toshiba_spinand_detect(struct spinand_device *spinand)
 150 +{
 151 +       u8 *id = spinand->id.data;
 152 +       int ret;
 153 +
 154 +       /*
 155 +        * Toshiba SPI NAND read ID needs a dummy byte,
 156 +        * so the first byte in id is garbage.
 157 +        */
 158 +       if (id[1] != SPINAND_MFR_TOSHIBA)
 159 +               return 0;
 160 +
 161 +       ret = spinand_match_and_init(spinand, toshiba_spinand_table,
 162 +                                    ARRAY_SIZE(toshiba_spinand_table),
 163 +                                    id[2]);
 164 +       if (ret)
 165 +               return ret;
 166 +
 167 +       return 1;
 168 +}
 169 +
 170 +static const struct spinand_manufacturer_ops toshiba_spinand_manuf_ops = {
 171 +       .detect = toshiba_spinand_detect,
 172 +};
 173 +
 174 +const struct spinand_manufacturer toshiba_spinand_manufacturer = {
 175 +       .id = SPINAND_MFR_TOSHIBA,
 176 +       .name = "Toshiba",
 177 +       .ops = &toshiba_spinand_manuf_ops,
 178 +};
 179 --- a/include/linux/mtd/spinand.h
 180 +++ b/include/linux/mtd/spinand.h
 181 @@ -196,6 +196,7 @@ struct spinand_manufacturer {
 182  /* SPI NAND manufacturers */
 183  extern const struct spinand_manufacturer macronix_spinand_manufacturer;
 184  extern const struct spinand_manufacturer micron_spinand_manufacturer;
 185 +extern const struct spinand_manufacturer toshiba_spinand_manufacturer;
 186  extern const struct spinand_manufacturer winbond_spinand_manufacturer;
 187
 188  /**