LXR uboot/fs/yaffs2/yaffs

   1/*
   2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3 *
   4 * Copyright (C) 2002-2007 Aleph One Ltd.
   5 *   for Toby Churchill Ltd and Brightstar Engineering
   6 *
   7 * Created by Charles Manning <charles@aleph1.co.uk>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14/* XXX U-BOOT XXX */
  15#include <common.h>
  16
  17const char *yaffs_mtdif_c_version =
  18    "$Id: yaffs_mtdif.c,v 1.19 2007/02/14 01:09:06 wookey Exp $";
  19
  20#include "yportenv.h"
  21
  22
  23#include "yaffs_mtdif.h"
  24
  25#include "linux/mtd/mtd.h"
  26#include "linux/types.h"
  27#include "linux/time.h"
  28#include "linux/mtd/nand.h"
  29
  30#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
  31static struct nand_oobinfo yaffs_oobinfo = {
  32        .useecc = 1,
  33        .eccbytes = 6,
  34        .eccpos = {8, 9, 10, 13, 14, 15}
  35};
  36
  37static struct nand_oobinfo yaffs_noeccinfo = {
  38        .useecc = 0,
  39};
  40#endif
  41
  42#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  43static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
  44{
  45        oob[0] = spare->tagByte0;
  46        oob[1] = spare->tagByte1;
  47        oob[2] = spare->tagByte2;
  48        oob[3] = spare->tagByte3;
  49        oob[4] = spare->tagByte4;
  50        oob[5] = spare->tagByte5 & 0x3f;
  51        oob[5] |= spare->blockStatus == 'Y' ? 0: 0x80;
  52        oob[5] |= spare->pageStatus == 0 ? 0: 0x40;
  53        oob[6] = spare->tagByte6;
  54        oob[7] = spare->tagByte7;
  55}
  56
  57static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
  58{
  59        struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
  60        spare->tagByte0 = oob[0];
  61        spare->tagByte1 = oob[1];
  62        spare->tagByte2 = oob[2];
  63        spare->tagByte3 = oob[3];
  64        spare->tagByte4 = oob[4];
  65        spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
  66        spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
  67        spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
  68        spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
  69        spare->tagByte6 = oob[6];
  70        spare->tagByte7 = oob[7];
  71        spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
  72
  73        nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
  74}
  75#endif
  76
  77int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
  78                             const __u8 * data, const yaffs_Spare * spare)
  79{
  80        struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  81#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  82        struct mtd_oob_ops ops;
  83#endif
  84        size_t dummy;
  85        int retval = 0;
  86
  87        loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
  88#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  89        __u8 spareAsBytes[8]; /* OOB */
  90
  91        if (data && !spare)
  92                retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
  93                                &dummy, data);
  94        else if (spare) {
  95                if (dev->useNANDECC) {
  96                        translate_spare2oob(spare, spareAsBytes);
  97                        ops.mode = MTD_OOB_AUTO;
  98                        ops.ooblen = 8; /* temp hack */
  99                } else {
 100                        ops.mode = MTD_OOB_RAW;
 101                        ops.ooblen = YAFFS_BYTES_PER_SPARE;
 102                }
 103                ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
 104                ops.datbuf = (u8 *)data;
 105                ops.ooboffs = 0;
 106                ops.oobbuf = spareAsBytes;
 107                retval = mtd->write_oob(mtd, addr, &ops);
 108        }
 109#else
 110        __u8 *spareAsBytes = (__u8 *) spare;
 111
 112        if (data && spare) {
 113                if (dev->useNANDECC)
 114                        retval =
 115                            mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
 116                                           &dummy, data, spareAsBytes,
 117                                           &yaffs_oobinfo);
 118                else
 119                        retval =
 120                            mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
 121                                           &dummy, data, spareAsBytes,
 122                                           &yaffs_noeccinfo);
 123        } else {
 124                if (data)
 125                        retval =
 126                            mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 127                                       data);
 128                if (spare)
 129                        retval =
 130                            mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 131                                           &dummy, spareAsBytes);
 132        }
 133#endif
 134
 135        if (retval == 0)
 136                return YAFFS_OK;
 137        else
 138                return YAFFS_FAIL;
 139}
 140
 141int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
 142                              yaffs_Spare * spare)
 143{
 144        struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 145#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 146        struct mtd_oob_ops ops;
 147#endif
 148        size_t dummy;
 149        int retval = 0;
 150
 151        loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
 152#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 153        __u8 spareAsBytes[8]; /* OOB */
 154
 155        if (data && !spare)
 156                retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
 157                                &dummy, data);
 158        else if (spare) {
 159                if (dev->useNANDECC) {
 160                        ops.mode = MTD_OOB_AUTO;
 161                        ops.ooblen = 8; /* temp hack */
 162                } else {
 163                        ops.mode = MTD_OOB_RAW;
 164                        ops.ooblen = YAFFS_BYTES_PER_SPARE;
 165                }
 166                ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
 167                ops.datbuf = data;
 168                ops.ooboffs = 0;
 169                ops.oobbuf = spareAsBytes;
 170                retval = mtd->read_oob(mtd, addr, &ops);
 171                if (dev->useNANDECC)
 172                        translate_oob2spare(spare, spareAsBytes);
 173        }
 174#else
 175        __u8 *spareAsBytes = (__u8 *) spare;
 176
 177        if (data && spare) {
 178                if (dev->useNANDECC) {
 179                        /* Careful, this call adds 2 ints */
 180                        /* to the end of the spare data.  Calling function */
 181                        /* should allocate enough memory for spare, */
 182                        /* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
 183                        retval =
 184                            mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 185                                          &dummy, data, spareAsBytes,
 186                                          &yaffs_oobinfo);
 187                } else {
 188                        retval =
 189                            mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 190                                          &dummy, data, spareAsBytes,
 191                                          &yaffs_noeccinfo);
 192                }
 193        } else {
 194                if (data)
 195                        retval =
 196                            mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 197                                      data);
 198                if (spare)
 199                        retval =
 200                            mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 201                                          &dummy, spareAsBytes);
 202        }
 203#endif
 204
 205        if (retval == 0)
 206                return YAFFS_OK;
 207        else
 208                return YAFFS_FAIL;
 209}
 210
 211int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
 212{
 213        struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 214        __u32 addr =
 215            ((loff_t) blockNumber) * dev->nDataBytesPerChunk
 216                * dev->nChunksPerBlock;
 217        struct erase_info ei;
 218        int retval = 0;
 219
 220        ei.mtd = mtd;
 221        ei.addr = addr;
 222        ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
 223        ei.time = 1000;
 224        ei.retries = 2;
 225        ei.callback = NULL;
 226        ei.priv = (u_long) dev;
 227
 228        /* Todo finish off the ei if required */
 229
 230/* XXX U-BOOT XXX */
 231#if 0
 232        sema_init(&dev->sem, 0);
 233#endif
 234
 235        retval = mtd->erase(mtd, &ei);
 236
 237        if (retval == 0)
 238                return YAFFS_OK;
 239        else
 240                return YAFFS_FAIL;
 241}
 242
 243int nandmtd_InitialiseNAND(yaffs_Device * dev)
 244{
 245        return YAFFS_OK;
 246}
 247