LXR linux/drivers/mtd/nand/sm

   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
  13static 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
  29static 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
  39static 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
  70static 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)
  97static 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
 110int 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}
 144EXPORT_SYMBOL_GPL(sm_register_device);
 145
 146MODULE_LICENSE("GPL");
 147MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
 148MODULE_DESCRIPTION("Common SmartMedia/xD functions");
 149