release/src-rt-6.x.4708/linux/linux-2.6.36/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 "sm_common.h"
  12
  13 static struct nand_ecclayout nand_oob_sm = {
  14         .eccbytes = 6,
  15         .eccpos = {8, 9, 10, 13, 14, 15},
  16         .oobfree = {
  17                 {.offset = 0 , .length = 4}, /* reserved */
  18                 {.offset = 6 , .length = 2}, /* LBA1 */
  19                 {.offset = 11, .length = 2}  /* LBA2 */
  20         }
  21 };
  22
  23 /* NOTE: This layout is is not compatabable with SmartMedia, */
  24 /* because the 256 byte devices have page depenent oob layout */
  25 /* However it does preserve the bad block markers */
  26 /* If you use smftl, it will bypass this and work correctly */
  27 /* If you not, then you break SmartMedia compliance anyway */
  28
  29 static struct nand_ecclayout nand_oob_sm_small = {
  30         .eccbytes = 3,
  31         .eccpos = {0, 1, 2},
  32         .oobfree = {
  33                 {.offset = 3 , .length = 2}, /* reserved */
  34                 {.offset = 6 , .length = 2}, /* LBA1 */
  35         }
  36 };
  37
  38
  39 static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs)
  40 {
  41         struct mtd_oob_ops ops;
  42         struct sm_oob oob;
  43         int ret, error = 0;
  44
  45         memset(&oob, -1, SM_OOB_SIZE);
  46         oob.block_status = 0x0F;
  47
  48         /* As long as this function is called on erase block boundaries
  49                 it will work correctly for 256 byte nand */
  50         ops.mode = MTD_OOB_PLACE;
  51         ops.ooboffs = 0;
  52         ops.ooblen = mtd->oobsize;
  53         ops.oobbuf = (void *)&oob;
  54         ops.datbuf = NULL;
  55
  56
  57         ret = mtd->write_oob(mtd, ofs, &ops);
  58         if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) {
  59                 printk(KERN_NOTICE
  60                         "sm_common: can't mark sector at %i as bad\n",
  61                                                                 (int)ofs);
  62                 error = -EIO;
  63         } else
  64                 mtd->ecc_stats.badblocks++;
  65
  66         return error;
  67 }
  68
  69
  70 static struct nand_flash_dev nand_smartmedia_flash_ids[] = {
  71         {"SmartMedia 1MiB 5V",          0x6e, 256, 1, 0x1000, 0},
  72         {"SmartMedia 1MiB 3,3V",        0xe8, 256, 1, 0x1000, 0},
  73         {"SmartMedia 1MiB 3,3V",        0xec, 256, 1, 0x1000, 0},
  74         {"SmartMedia 2MiB 3,3V",        0xea, 256, 2, 0x1000, 0},
  75         {"SmartMedia 2MiB 5V",          0x64, 256, 2, 0x1000, 0},
  76         {"SmartMedia 2MiB 3,3V ROM",    0x5d, 512, 2, 0x2000, NAND_ROM},
  77         {"SmartMedia 4MiB 3,3V",        0xe3, 512, 4, 0x2000, 0},
  78         {"SmartMedia 4MiB 3,3/5V",      0xe5, 512, 4, 0x2000, 0},
  79         {"SmartMedia 4MiB 5V",          0x6b, 512, 4, 0x2000, 0},
  80         {"SmartMedia 4MiB 3,3V ROM",    0xd5, 512, 4, 0x2000, NAND_ROM},
  81         {"SmartMedia 8MiB 3,3V",        0xe6, 512, 8, 0x2000, 0},
  82         {"SmartMedia 8MiB 3,3V ROM",    0xd6, 512, 8, 0x2000, NAND_ROM},
  83         {"SmartMedia 16MiB 3,3V",       0x73, 512, 16, 0x4000, 0},
  84         {"SmartMedia 16MiB 3,3V ROM",   0x57, 512, 16, 0x4000, NAND_ROM},
  85         {"SmartMedia 32MiB 3,3V",       0x75, 512, 32, 0x4000, 0},
  86         {"SmartMedia 32MiB 3,3V ROM",   0x58, 512, 32, 0x4000, NAND_ROM},
  87         {"SmartMedia 64MiB 3,3V",       0x76, 512, 64, 0x4000, 0},
  88         {"SmartMedia 64MiB 3,3V ROM",   0xd9, 512, 64, 0x4000, NAND_ROM},
  89         {"SmartMedia 128MiB 3,3V",      0x79, 512, 128, 0x4000, 0},
  90         {"SmartMedia 128MiB 3,3V ROM",  0xda, 512, 128, 0x4000, NAND_ROM},
  91         {"SmartMedia 256MiB 3,3V",      0x71, 512, 256, 0x4000 },
  92         {"SmartMedia 256MiB 3,3V ROM",  0x5b, 512, 256, 0x4000, NAND_ROM},
  93         {NULL,}
  94 };
  95
  96 #define XD_TYPEM       (NAND_NO_AUTOINCR | NAND_BROKEN_XD)
  97 static struct nand_flash_dev nand_xd_flash_ids[] = {
  98
  99         {"xD 16MiB 3,3V",    0x73, 512, 16, 0x4000, 0},
 100         {"xD 32MiB 3,3V",    0x75, 512, 32, 0x4000, 0},
 101         {"xD 64MiB 3,3V",    0x76, 512, 64, 0x4000, 0},
 102         {"xD 128MiB 3,3V",   0x79, 512, 128, 0x4000, 0},
 103         {"xD 256MiB 3,3V",   0x71, 512, 256, 0x4000, XD_TYPEM},
 104         {"xD 512MiB 3,3V",   0xdc, 512, 512, 0x4000, XD_TYPEM},
 105         {"xD 1GiB 3,3V",     0xd3, 512, 1024, 0x4000, XD_TYPEM},
 106         {"xD 2GiB 3,3V",     0xd5, 512, 2048, 0x4000, XD_TYPEM},
 107         {NULL,}
 108 };
 109
 110 int sm_register_device(struct mtd_info *mtd, int smartmedia)
 111 {
 112         struct nand_chip *chip = mtd->priv;
 113         int ret;
 114
 115         chip->options |= NAND_SKIP_BBTSCAN;
 116
 117         /* Scan for card properties */
 118         ret = nand_scan_ident(mtd, 1, smartmedia ?
 119                 nand_smartmedia_flash_ids : nand_xd_flash_ids);
 120
 121         if (ret)
 122                 return ret;
 123
 124         /* Bad block marker postion */
 125         chip->badblockpos = 0x05;
 126         chip->badblockbits = 7;
 127         chip->block_markbad = sm_block_markbad;
 128
 129         /* ECC layout */
 130         if (mtd->writesize == SM_SECTOR_SIZE)
 131                 chip->ecc.layout = &nand_oob_sm;
 132         else if (mtd->writesize == SM_SMALL_PAGE)
 133                 chip->ecc.layout = &nand_oob_sm_small;
 134         else
 135                 return -ENODEV;
 136
 137         ret = nand_scan_tail(mtd);
 138
 139         if (ret)
 140                 return ret;
 141
 142         return add_mtd_device(mtd);
 143 }
 144 EXPORT_SYMBOL_GPL(sm_register_device);
 145
 146 MODULE_LICENSE("GPL");
 147 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
 148 MODULE_DESCRIPTION("Common SmartMedia/xD functions");