drivers/mtd/nand/raw/sm_common.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright © 2009 - Maxim Levitsky
   4  * Common routines & support for xD format
   5  */
   6 #include <linux/kernel.h>
   7 #include <linux/mtd/rawnand.h>
   8 #include <linux/module.h>
   9 #include <linux/sizes.h>
  10 #include "sm_common.h"
  11
  12 static int oob_sm_ooblayout_ecc(struct mtd_info *mtd, int section,
  13                                 struct mtd_oob_region *oobregion)
  14 {
  15         if (section > 1)
  16                 return -ERANGE;
  17
  18         oobregion->length = 3;
  19         oobregion->offset = ((section + 1) * 8) - 3;
  20
  21         return 0;
  22 }
  23
  24 static int oob_sm_ooblayout_free(struct mtd_info *mtd, int section,
  25                                  struct mtd_oob_region *oobregion)
  26 {
  27         switch (section) {
  28         case 0:
  29                 /* reserved */
  30                 oobregion->offset = 0;
  31                 oobregion->length = 4;
  32                 break;
  33         case 1:
  34                 /* LBA1 */
  35                 oobregion->offset = 6;
  36                 oobregion->length = 2;
  37                 break;
  38         case 2:
  39                 /* LBA2 */
  40                 oobregion->offset = 11;
  41                 oobregion->length = 2;
  42                 break;
  43         default:
  44                 return -ERANGE;
  45         }
  46
  47         return 0;
  48 }
  49
  50 static const struct mtd_ooblayout_ops oob_sm_ops = {
  51         .ecc = oob_sm_ooblayout_ecc,
  52         .free = oob_sm_ooblayout_free,
  53 };
  54
  55 /* NOTE: This layout is is not compatabable with SmartMedia, */
  56 /* because the 256 byte devices have page depenent oob layout */
  57 /* However it does preserve the bad block markers */
  58 /* If you use smftl, it will bypass this and work correctly */
  59 /* If you not, then you break SmartMedia compliance anyway */
  60
  61 static int oob_sm_small_ooblayout_ecc(struct mtd_info *mtd, int section,
  62                                       struct mtd_oob_region *oobregion)
  63 {
  64         if (section)
  65                 return -ERANGE;
  66
  67         oobregion->length = 3;
  68         oobregion->offset = 0;
  69
  70         return 0;
  71 }
  72
  73 static int oob_sm_small_ooblayout_free(struct mtd_info *mtd, int section,
  74                                        struct mtd_oob_region *oobregion)
  75 {
  76         switch (section) {
  77         case 0:
  78                 /* reserved */
  79                 oobregion->offset = 3;
  80                 oobregion->length = 2;
  81                 break;
  82         case 1:
  83                 /* LBA1 */
  84                 oobregion->offset = 6;
  85                 oobregion->length = 2;
  86                 break;
  87         default:
  88                 return -ERANGE;
  89         }
  90
  91         return 0;
  92 }
  93
  94 static const struct mtd_ooblayout_ops oob_sm_small_ops = {
  95         .ecc = oob_sm_small_ooblayout_ecc,
  96         .free = oob_sm_small_ooblayout_free,
  97 };
  98
  99 static int sm_block_markbad(struct nand_chip *chip, loff_t ofs)
 100 {
 101         struct mtd_info *mtd = nand_to_mtd(chip);
 102         struct mtd_oob_ops ops;
 103         struct sm_oob oob;
 104         int ret;
 105
 106         memset(&oob, -1, SM_OOB_SIZE);
 107         oob.block_status = 0x0F;
 108
 109         /* As long as this function is called on erase block boundaries
 110                 it will work correctly for 256 byte nand */
 111         ops.mode = MTD_OPS_PLACE_OOB;
 112         ops.ooboffs = 0;
 113         ops.ooblen = mtd->oobsize;
 114         ops.oobbuf = (void *)&oob;
 115         ops.datbuf = NULL;
 116
 117
 118         ret = mtd_write_oob(mtd, ofs, &ops);
 119         if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) {
 120                 pr_notice("sm_common: can't mark sector at %i as bad\n",
 121                           (int)ofs);
 122                 return -EIO;
 123         }
 124
 125         return 0;
 126 }
 127
 128 static struct nand_flash_dev nand_smartmedia_flash_ids[] = {
 129         LEGACY_ID_NAND("SmartMedia 2MiB 3,3V ROM",   0x5d, 2,   SZ_8K, NAND_ROM),
 130         LEGACY_ID_NAND("SmartMedia 4MiB 3,3V",       0xe3, 4,   SZ_8K, 0),
 131         LEGACY_ID_NAND("SmartMedia 4MiB 3,3/5V",     0xe5, 4,   SZ_8K, 0),
 132         LEGACY_ID_NAND("SmartMedia 4MiB 5V",         0x6b, 4,   SZ_8K, 0),
 133         LEGACY_ID_NAND("SmartMedia 4MiB 3,3V ROM",   0xd5, 4,   SZ_8K, NAND_ROM),
 134         LEGACY_ID_NAND("SmartMedia 8MiB 3,3V",       0xe6, 8,   SZ_8K, 0),
 135         LEGACY_ID_NAND("SmartMedia 8MiB 3,3V ROM",   0xd6, 8,   SZ_8K, NAND_ROM),
 136         LEGACY_ID_NAND("SmartMedia 16MiB 3,3V",      0x73, 16,  SZ_16K, 0),
 137         LEGACY_ID_NAND("SmartMedia 16MiB 3,3V ROM",  0x57, 16,  SZ_16K, NAND_ROM),
 138         LEGACY_ID_NAND("SmartMedia 32MiB 3,3V",      0x75, 32,  SZ_16K, 0),
 139         LEGACY_ID_NAND("SmartMedia 32MiB 3,3V ROM",  0x58, 32,  SZ_16K, NAND_ROM),
 140         LEGACY_ID_NAND("SmartMedia 64MiB 3,3V",      0x76, 64,  SZ_16K, 0),
 141         LEGACY_ID_NAND("SmartMedia 64MiB 3,3V ROM",  0xd9, 64,  SZ_16K, NAND_ROM),
 142         LEGACY_ID_NAND("SmartMedia 128MiB 3,3V",     0x79, 128, SZ_16K, 0),
 143         LEGACY_ID_NAND("SmartMedia 128MiB 3,3V ROM", 0xda, 128, SZ_16K, NAND_ROM),
 144         LEGACY_ID_NAND("SmartMedia 256MiB 3, 3V",    0x71, 256, SZ_16K, 0),
 145         LEGACY_ID_NAND("SmartMedia 256MiB 3,3V ROM", 0x5b, 256, SZ_16K, NAND_ROM),
 146         {NULL}
 147 };
 148
 149 static struct nand_flash_dev nand_xd_flash_ids[] = {
 150         LEGACY_ID_NAND("xD 16MiB 3,3V",  0x73, 16,   SZ_16K, 0),
 151         LEGACY_ID_NAND("xD 32MiB 3,3V",  0x75, 32,   SZ_16K, 0),
 152         LEGACY_ID_NAND("xD 64MiB 3,3V",  0x76, 64,   SZ_16K, 0),
 153         LEGACY_ID_NAND("xD 128MiB 3,3V", 0x79, 128,  SZ_16K, 0),
 154         LEGACY_ID_NAND("xD 256MiB 3,3V", 0x71, 256,  SZ_16K, NAND_BROKEN_XD),
 155         LEGACY_ID_NAND("xD 512MiB 3,3V", 0xdc, 512,  SZ_16K, NAND_BROKEN_XD),
 156         LEGACY_ID_NAND("xD 1GiB 3,3V",   0xd3, 1024, SZ_16K, NAND_BROKEN_XD),
 157         LEGACY_ID_NAND("xD 2GiB 3,3V",   0xd5, 2048, SZ_16K, NAND_BROKEN_XD),
 158         {NULL}
 159 };
 160
 161 static int sm_attach_chip(struct nand_chip *chip)
 162 {
 163         struct mtd_info *mtd = nand_to_mtd(chip);
 164
 165         /* Bad block marker position */
 166         chip->badblockpos = 0x05;
 167         chip->badblockbits = 7;
 168         chip->legacy.block_markbad = sm_block_markbad;
 169
 170         /* ECC layout */
 171         if (mtd->writesize == SM_SECTOR_SIZE)
 172                 mtd_set_ooblayout(mtd, &oob_sm_ops);
 173         else if (mtd->writesize == SM_SMALL_PAGE)
 174                 mtd_set_ooblayout(mtd, &oob_sm_small_ops);
 175         else
 176                 return -ENODEV;
 177
 178         return 0;
 179 }
 180
 181 static const struct nand_controller_ops sm_controller_ops = {
 182         .attach_chip = sm_attach_chip,
 183 };
 184
 185 int sm_register_device(struct mtd_info *mtd, int smartmedia)
 186 {
 187         struct nand_chip *chip = mtd_to_nand(mtd);
 188         struct nand_flash_dev *flash_ids;
 189         int ret;
 190
 191         chip->options |= NAND_SKIP_BBTSCAN;
 192
 193         /* Scan for card properties */
 194         chip->legacy.dummy_controller.ops = &sm_controller_ops;
 195         flash_ids = smartmedia ? nand_smartmedia_flash_ids : nand_xd_flash_ids;
 196         ret = nand_scan_with_ids(chip, 1, flash_ids);
 197         if (ret)
 198                 return ret;
 199
 200         ret = mtd_device_register(mtd, NULL, 0);
 201         if (ret)
 202                 nand_cleanup(chip);
 203
 204         return ret;
 205 }
 206 EXPORT_SYMBOL_GPL(sm_register_device);
 207
 208 MODULE_LICENSE("GPL");
 209 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
 210 MODULE_DESCRIPTION("Common SmartMedia/xD functions");