target/linux/sunxi/patches-4.1/117-mtd-nand-add-hynix-init.patch

   1 From 5c5e3963a1b58be1669da5da93f51dc339cd73d7 Mon Sep 17 00:00:00 2001
   2 From: Boris BREZILLON <b.brezillon.dev@gmail.com>
   3 Date: Mon, 24 Feb 2014 16:30:22 +0100
   4 Subject: [PATCH] mtd: nand: Add hynix specific initializer
   5
   6 Add an hynix initiliazer to manage read retries on h27uxgt8t2a chip.
   7
   8 Signed-off-by: Boris BREZILLON <b.brezillon.dev@gmail.com>
   9 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  10 ---
  11  drivers/mtd/nand/Makefile     |   2 +-
  12  drivers/mtd/nand/nand_hynix.c | 159 ++++++++++++++++++++++++++++++++++++++++++
  13  drivers/mtd/nand/nand_ids.c   |   3 +-
  14  include/linux/mtd/nand.h      |   2 +
  15  4 files changed, 164 insertions(+), 2 deletions(-)
  16  create mode 100644 drivers/mtd/nand/nand_hynix.c
  17
  18 diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
  19 index fcbe032..07b7c8c 100644
  20 --- a/drivers/mtd/nand/Makefile
  21 +++ b/drivers/mtd/nand/Makefile
  22 @@ -5,7 +5,7 @@
  23  obj-$(CONFIG_MTD_NAND)                 += nand.o
  24  obj-$(CONFIG_MTD_NAND_ECC)             += nand_ecc.o
  25  obj-$(CONFIG_MTD_NAND_BCH)             += nand_bch.o
  26 -obj-$(CONFIG_MTD_NAND_IDS)             += nand_ids.o
  27 +obj-$(CONFIG_MTD_NAND_IDS)             += nand_ids.o nand_hynix.o
  28  obj-$(CONFIG_MTD_SM_COMMON)            += sm_common.o
  29
  30  obj-$(CONFIG_MTD_NAND_CAFE)            += cafe_nand.o
  31 diff --git a/drivers/mtd/nand/nand_hynix.c b/drivers/mtd/nand/nand_hynix.c
  32 new file mode 100644
  33 index 0000000..0d051bf5
  34 --- /dev/null
  35 +++ b/drivers/mtd/nand/nand_hynix.c
  36 @@ -0,0 +1,159 @@
  37 +/*
  38 + * Copyright (C) 2014 Boris BREZILLON <b.brezillon.dev@gmail.com>
  39 + *
  40 + * This program is free software; you can redistribute it and/or modify
  41 + * it under the terms of the GNU General Public License as published by
  42 + * the Free Software Foundation; either version 2 of the License, or
  43 + * (at your option) any later version.
  44 + *
  45 + * This program is distributed in the hope that it will be useful,
  46 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  47 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  48 + * GNU General Public License for more details.
  49 + */
  50 +
  51 +#include <linux/module.h>
  52 +#include <linux/mtd/nand.h>
  53 +#include <linux/slab.h>
  54 +
  55 +static u8 h27ucg8t2a_read_retry_regs[] = {
  56 +       0xcc, 0xbf, 0xaa, 0xab, 0xcd, 0xad, 0xae, 0xaf
  57 +};
  58 +
  59 +struct hynix_read_retry {
  60 +       u8 *regs;
  61 +       u8 values[64];
  62 +};
  63 +
  64 +struct hynix_nand {
  65 +       struct hynix_read_retry read_retry;
  66 +};
  67 +
  68 +int nand_setup_read_retry_hynix(struct mtd_info *mtd, int retry_mode)
  69 +{
  70 +       struct nand_chip *chip = mtd->priv;
  71 +       struct hynix_nand *hynix = chip->manuf_priv;
  72 +       int offset = retry_mode * 8;
  73 +       int status;
  74 +       int i;
  75 +
  76 +       chip->cmdfunc(mtd, 0x36, -1, -1);
  77 +       for (i = 0; i < 8; i++) {
  78 +               int column = hynix->read_retry.regs[i];
  79 +               column |= column << 8;
  80 +               chip->cmdfunc(mtd, NAND_CMD_NONE, column, -1);
  81 +               chip->write_byte(mtd, hynix->read_retry.values[offset + i]);
  82 +       }
  83 +       chip->cmdfunc(mtd, 0x16, -1, -1);
  84 +
  85 +       status = chip->waitfunc(mtd, chip);
  86 +       if (status & NAND_STATUS_FAIL)
  87 +               return -EIO;
  88 +
  89 +       return 0;
  90 +}
  91 +
  92 +static void h27ucg8t2a_cleanup(struct mtd_info *mtd)
  93 +{
  94 +       struct nand_chip *chip = mtd->priv;
  95 +       kfree(chip->manuf_priv);
  96 +}
  97 +
  98 +static int h27ucg8t2a_init(struct mtd_info *mtd, const uint8_t *id)
  99 +{
 100 +       struct nand_chip *chip = mtd->priv;
 101 +       struct hynix_nand *hynix;
 102 +       u8 * buf = NULL;
 103 +       int i, j;
 104 +       int ret;
 105 +
 106 +       buf = kzalloc(1024, GFP_KERNEL);
 107 +       if (!buf)
 108 +               return -ENOMEM;
 109 +
 110 +       chip->select_chip(mtd, 0);
 111 +       chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
 112 +       chip->cmdfunc(mtd, 0x36, 0xff, -1);
 113 +       chip->write_byte(mtd, 0x40);
 114 +       chip->cmdfunc(mtd, NAND_CMD_NONE, 0xcc, -1);
 115 +       chip->write_byte(mtd, 0x4d);
 116 +       chip->cmdfunc(mtd, 0x16, -1, -1);
 117 +       chip->cmdfunc(mtd, 0x17, -1, -1);
 118 +       chip->cmdfunc(mtd, 0x04, -1, -1);
 119 +       chip->cmdfunc(mtd, 0x19, -1, -1);
 120 +       chip->cmdfunc(mtd, NAND_CMD_READ0, 0x0, 0x200);
 121 +
 122 +       chip->read_buf(mtd, buf, 2);
 123 +       if (buf[0] != 0x8 || buf[1] != 0x8) {
 124 +               ret = -EINVAL;
 125 +               goto leave;
 126 +       }
 127 +       chip->read_buf(mtd, buf, 1024);
 128 +
 129 +       ret = 0;
 130 +       for (j = 0; j < 8; j++) {
 131 +               for (i = 0; i < 64; i++) {
 132 +                       u8 *tmp = buf + (128 * j);
 133 +                       if ((tmp[i] | tmp[i + 64]) != 0xff) {
 134 +                               ret = -EINVAL;
 135 +                               goto leave;
 136 +                       }
 137 +               }
 138 +       }
 139 +
 140 +       chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
 141 +       chip->cmdfunc(mtd, 0x38, -1, -1);
 142 +       chip->select_chip(mtd, -1);
 143 +
 144 +       if (!ret) {
 145 +               hynix = kzalloc(sizeof(*hynix), GFP_KERNEL);
 146 +               if (!hynix) {
 147 +                       ret = -ENOMEM;
 148 +                       goto leave;
 149 +               }
 150 +
 151 +               hynix->read_retry.regs = h27ucg8t2a_read_retry_regs;
 152 +               memcpy(hynix->read_retry.values, buf, 64);
 153 +               chip->manuf_priv = hynix;
 154 +               chip->setup_read_retry = nand_setup_read_retry_hynix;
 155 +               chip->read_retries = 8;
 156 +               chip->manuf_cleanup = h27ucg8t2a_cleanup;
 157 +       }
 158 +
 159 +leave:
 160 +       kfree(buf);
 161 +
 162 +       return ret;
 163 +}
 164 +
 165 +struct hynix_nand_initializer {
 166 +       u8 id[6];
 167 +       int (*init)(struct mtd_info *mtd, const uint8_t *id);
 168 +};
 169 +
 170 +struct hynix_nand_initializer initializers[] = {
 171 +       {
 172 +               .id = {NAND_MFR_HYNIX, 0xde, 0x94, 0xda, 0x74, 0xc4},
 173 +               .init = h27ucg8t2a_init,
 174 +       },
 175 +};
 176 +
 177 +int hynix_nand_init(struct mtd_info *mtd, const uint8_t *id)
 178 +{
 179 +       int i;
 180 +
 181 +       for (i = 0; i < ARRAY_SIZE(initializers); i++) {
 182 +               struct hynix_nand_initializer *initializer = &initializers[i];
 183 +               if (memcmp(id, initializer->id, sizeof(initializer->id)))
 184 +                       continue;
 185 +
 186 +               return initializer->init(mtd, id);
 187 +       }
 188 +
 189 +       return 0;
 190 +}
 191 +EXPORT_SYMBOL(hynix_nand_init);
 192 +
 193 +MODULE_LICENSE("GPL");
 194 +MODULE_AUTHOR("Boris BREZILLON <b.brezillon.dev@gmail.com>");
 195 +MODULE_DESCRIPTION("Hynix NAND specific code");
 196 diff --git a/drivers/mtd/nand/nand_ids.c b/drivers/mtd/nand/nand_ids.c
 197 index dd620c1..b786718 100644
 198 --- a/drivers/mtd/nand/nand_ids.c
 199 +++ b/drivers/mtd/nand/nand_ids.c
 200 @@ -163,6 +163,7 @@ struct nand_flash_dev nand_flash_ids[] = {
 201         {NULL}
 202  };
 203
 204 +
 205  /* Manufacturer IDs */
 206  struct nand_manufacturers nand_manuf_ids[] = {
 207         {NAND_MFR_TOSHIBA, "Toshiba"},
 208 @@ -171,7 +172,7 @@ struct nand_manufacturers nand_manuf_ids[] = {
 209         {NAND_MFR_NATIONAL, "National"},
 210         {NAND_MFR_RENESAS, "Renesas"},
 211         {NAND_MFR_STMICRO, "ST Micro"},
 212 -       {NAND_MFR_HYNIX, "Hynix"},
 213 +       {NAND_MFR_HYNIX, "Hynix", hynix_nand_init},
 214         {NAND_MFR_MICRON, "Micron"},
 215         {NAND_MFR_AMD, "AMD/Spansion"},
 216         {NAND_MFR_MACRONIX, "Macronix"},
 217 diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
 218 index 5844d6f..328aab2 100644
 219 --- a/include/linux/mtd/nand.h
 220 +++ b/include/linux/mtd/nand.h
 221 @@ -959,6 +959,8 @@ struct nand_manufacturers {
 222  extern struct nand_flash_dev nand_flash_ids[];
 223  extern struct nand_manufacturers nand_manuf_ids[];
 224
 225 +int hynix_nand_init(struct mtd_info *mtd, const uint8_t *id);
 226 +
 227  extern int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd);
 228  extern int nand_default_bbt(struct mtd_info *mtd);
 229  extern int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs);