target/linux/generic-2.6/files-2.6.25/fs/yaffs2/yaffs_nand.c

   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 const char *yaffs_nand_c_version =
  15     "$Id: yaffs_nand.c,v 1.7 2007-02-14 01:09:06 wookey Exp $";
  16
  17 #include "yaffs_nand.h"
  18 #include "yaffs_tagscompat.h"
  19 #include "yaffs_tagsvalidity.h"
  20
  21
  22 int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
  23                                            __u8 * buffer,
  24                                            yaffs_ExtendedTags * tags)
  25 {
  26         int result;
  27         yaffs_ExtendedTags localTags;
  28
  29         int realignedChunkInNAND = chunkInNAND - dev->chunkOffset;
  30
  31         /* If there are no tags provided, use local tags to get prioritised gc working */
  32         if(!tags)
  33                 tags = &localTags;
  34
  35         if (dev->readChunkWithTagsFromNAND)
  36                 result = dev->readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
  37                                                       tags);
  38         else
  39                 result = yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
  40                                                                         realignedChunkInNAND,
  41                                                                         buffer,
  42                                                                         tags);
  43         if(tags &&
  44            tags->eccResult > YAFFS_ECC_RESULT_NO_ERROR){
  45
  46                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->nChunksPerBlock);
  47                 yaffs_HandleChunkError(dev,bi);
  48         }
  49
  50         return result;
  51 }
  52
  53 int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
  54                                                    int chunkInNAND,
  55                                                    const __u8 * buffer,
  56                                                    yaffs_ExtendedTags * tags)
  57 {
  58         chunkInNAND -= dev->chunkOffset;
  59
  60
  61         if (tags) {
  62                 tags->sequenceNumber = dev->sequenceNumber;
  63                 tags->chunkUsed = 1;
  64                 if (!yaffs_ValidateTags(tags)) {
  65                         T(YAFFS_TRACE_ERROR,
  66                           (TSTR("Writing uninitialised tags" TENDSTR)));
  67                         YBUG();
  68                 }
  69                 T(YAFFS_TRACE_WRITE,
  70                   (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
  71                    tags->objectId, tags->chunkId));
  72         } else {
  73                 T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
  74                 YBUG();
  75         }
  76
  77         if (dev->writeChunkWithTagsToNAND)
  78                 return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
  79                                                      tags);
  80         else
  81                 return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
  82                                                                        chunkInNAND,
  83                                                                        buffer,
  84                                                                        tags);
  85 }
  86
  87 int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo)
  88 {
  89         blockNo -= dev->blockOffset;
  90
  91 ;
  92         if (dev->markNANDBlockBad)
  93                 return dev->markNANDBlockBad(dev, blockNo);
  94         else
  95                 return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
  96 }
  97
  98 int yaffs_QueryInitialBlockState(yaffs_Device * dev,
  99                                                  int blockNo,
 100                                                  yaffs_BlockState * state,
 101                                                  unsigned *sequenceNumber)
 102 {
 103         blockNo -= dev->blockOffset;
 104
 105         if (dev->queryNANDBlock)
 106                 return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
 107         else
 108                 return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
 109                                                              state,
 110                                                              sequenceNumber);
 111 }
 112
 113
 114 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
 115                                   int blockInNAND)
 116 {
 117         int result;
 118
 119         blockInNAND -= dev->blockOffset;
 120
 121
 122         dev->nBlockErasures++;
 123         result = dev->eraseBlockInNAND(dev, blockInNAND);
 124
 125         return result;
 126 }
 127
 128 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 129 {
 130         return dev->initialiseNAND(dev);
 131 }
 132
 133
 134