drivers/mtd/nand/sm_common.c

   1 /*
   2  * Copyright © 2009 - Maxim Levitsky
   3  * Common routines & support for xD format
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/mtd/nand.h>
  11 #include <linux/module.h>
  12 #include <linux/sizes.h>
  13 #include "sm_common.h"
  14
  15 static struct nand_ecclayout nand_oob_sm = {
  16         .eccbytes = 6,
  17         .eccpos = {8, 9, 10, 13, 14, 15},
  18         .oobfree = {
  19                 {.offset = 0 , .length = 4}, /* reserved */
  20                 {.offset = 6 , .length = 2}, /* LBA1 */
  21                 {.offset = 11, .length = 2}  /* LBA2 */
  22         }
  23 };
  24
  25 /* NOTE: This layout is is not compatabable with SmartMedia, */
  26 /* because the 256 byte devices have page depenent oob layout */
  27 /* However it does preserve the bad block markers */
  28 /* If you use smftl, it will bypass this and work correctly */
  29 /* If you not, then you break SmartMedia compliance anyway */
  30
  31 static struct nand_ecclayout nand_oob_sm_small = {
  32         .eccbytes = 3,
  33         .eccpos = {0, 1, 2},
  34         .oobfree = {
  35                 {.offset = 3 , .length = 2}, /* reserved */
  36                 {.offset = 6 , .length = 2}, /* LBA1 */
  37         }
  38 };
  39
  40
  41 static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs)
  42 {
  43         struct mtd_oob_ops ops;
  44         struct sm_oob oob;
  45         int ret, error = 0;
  46
  47         memset(&oob, -1, SM_OOB_SIZE);
  48         oob.block_status = 0x0F;
  49
  50         /* As long as this function is called on erase block boundaries
  51                 it will work correctly for 256 byte nand */
  52         ops.mode = MTD_OPS_PLACE_OOB;
  53         ops.ooboffs = 0;
  54         ops.ooblen = mtd->oobsize;
  55         ops.oobbuf = (void *)&oob;
  56         ops.datbuf = NULL;
  57
  58
  59         ret = mtd_write_oob(mtd, ofs, &ops);
  60         if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) {
  61                 printk(KERN_NOTICE
  62                         "sm_common: can't mark sector at %i as bad\n",
  63                                                                 (int)ofs);
  64                 error = -EIO;
  65         } else
  66                 mtd->ecc_stats.badblocks++;
  67
  68         return error;
  69 }
  70
  71 static struct nand_flash_dev nand_smartmedia_flash_ids[] = {
  72         LEGACY_ID_NAND("SmartMedia 2MiB 3,3V ROM",   0x5d, 2,   SZ_8K, NAND_ROM),
  73         LEGACY_ID_NAND("SmartMedia 4MiB 3,3V",       0xe3, 4,   SZ_8K, 0),
  74         LEGACY_ID_NAND("SmartMedia 4MiB 3,3/5V",     0xe5, 4,   SZ_8K, 0),
  75         LEGACY_ID_NAND("SmartMedia 4MiB 5V",         0x6b, 4,   SZ_8K, 0),
  76         LEGACY_ID_NAND("SmartMedia 4MiB 3,3V ROM",   0xd5, 4,   SZ_8K, NAND_ROM),
  77         LEGACY_ID_NAND("SmartMedia 8MiB 3,3V",       0xe6, 8,   SZ_8K, 0),
  78         LEGACY_ID_NAND("SmartMedia 8MiB 3,3V ROM",   0xd6, 8,   SZ_8K, NAND_ROM),
  79         LEGACY_ID_NAND("SmartMedia 16MiB 3,3V",      0x73, 16,  SZ_16K, 0),
  80         LEGACY_ID_NAND("SmartMedia 16MiB 3,3V ROM",  0x57, 16,  SZ_16K, NAND_ROM),
  81         LEGACY_ID_NAND("SmartMedia 32MiB 3,3V",      0x75, 32,  SZ_16K, 0),
  82         LEGACY_ID_NAND("SmartMedia 32MiB 3,3V ROM",  0x58, 32,  SZ_16K, NAND_ROM),
  83         LEGACY_ID_NAND("SmartMedia 64MiB 3,3V",      0x76, 64,  SZ_16K, 0),
  84         LEGACY_ID_NAND("SmartMedia 64MiB 3,3V ROM",  0xd9, 64,  SZ_16K, NAND_ROM),
  85         LEGACY_ID_NAND("SmartMedia 128MiB 3,3V",     0x79, 128, SZ_16K, 0),
  86         LEGACY_ID_NAND("SmartMedia 128MiB 3,3V ROM", 0xda, 128, SZ_16K, NAND_ROM),
  87         LEGACY_ID_NAND("SmartMedia 256MiB 3, 3V",    0x71, 256, SZ_16K, 0),
  88         LEGACY_ID_NAND("SmartMedia 256MiB 3,3V ROM", 0x5b, 256, SZ_16K, NAND_ROM),
  89         {NULL}
  90 };
  91
  92 static struct nand_flash_dev nand_xd_flash_ids[] = {
  93         LEGACY_ID_NAND("xD 16MiB 3,3V",  0x73, 16,   SZ_16K, 0),
  94         LEGACY_ID_NAND("xD 32MiB 3,3V",  0x75, 32,   SZ_16K, 0),
  95         LEGACY_ID_NAND("xD 64MiB 3,3V",  0x76, 64,   SZ_16K, 0),
  96         LEGACY_ID_NAND("xD 128MiB 3,3V", 0x79, 128,  SZ_16K, 0),
  97         LEGACY_ID_NAND("xD 256MiB 3,3V", 0x71, 256,  SZ_16K, NAND_BROKEN_XD),
  98         LEGACY_ID_NAND("xD 512MiB 3,3V", 0xdc, 512,  SZ_16K, NAND_BROKEN_XD),
  99         LEGACY_ID_NAND("xD 1GiB 3,3V",   0xd3, 1024, SZ_16K, NAND_BROKEN_XD),
 100         LEGACY_ID_NAND("xD 2GiB 3,3V",   0xd5, 2048, SZ_16K, NAND_BROKEN_XD),
 101         {NULL}
 102 };
 103
 104 int sm_register_device(struct mtd_info *mtd, int smartmedia)
 105 {
 106         struct nand_chip *chip = mtd->priv;
 107         int ret;
 108
 109         chip->options |= NAND_SKIP_BBTSCAN;
 110
 111         /* Scan for card properties */
 112         ret = nand_scan_ident(mtd, 1, smartmedia ?
 113                 nand_smartmedia_flash_ids : nand_xd_flash_ids);
 114
 115         if (ret)
 116                 return ret;
 117
 118         /* Bad block marker position */
 119         chip->badblockpos = 0x05;
 120         chip->badblockbits = 7;
 121         chip->block_markbad = sm_block_markbad;
 122
 123         /* ECC layout */
 124         if (mtd->writesize == SM_SECTOR_SIZE)
 125                 chip->ecc.layout = &nand_oob_sm;
 126         else if (mtd->writesize == SM_SMALL_PAGE)
 127                 chip->ecc.layout = &nand_oob_sm_small;
 128         else
 129                 return -ENODEV;
 130
 131         ret = nand_scan_tail(mtd);
 132
 133         if (ret)
 134                 return ret;
 135
 136         return mtd_device_register(mtd, NULL, 0);
 137 }
 138 EXPORT_SYMBOL_GPL(sm_register_device);
 139
 140 MODULE_LICENSE("GPL");
 141 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
 142 MODULE_DESCRIPTION("Common SmartMedia/xD functions");