target/linux/generic-2.6/files-2.6.26/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 1.9 2008-05-05 07:58:58 charles Exp $";
  16
  17 #include "yaffs_nand.h"
  18 #include "yaffs_tagscompat.h"
  19 #include "yaffs_tagsvalidity.h"
  20
  21 #include "yaffs_getblockinfo.h"
  22
  23 int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
  24                                            __u8 * buffer,
  25                                            yaffs_ExtendedTags * tags)
  26 {
  27         int result;
  28         yaffs_ExtendedTags localTags;
  29
  30         int realignedChunkInNAND = chunkInNAND - dev->chunkOffset;
  31
  32         /* If there are no tags provided, use local tags to get prioritised gc working */
  33         if(!tags)
  34                 tags = &localTags;
  35
  36         if (dev->readChunkWithTagsFromNAND)
  37                 result = dev->readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
  38                                                       tags);
  39         else
  40                 result = yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
  41                                                                         realignedChunkInNAND,
  42                                                                         buffer,
  43                                                                         tags);
  44         if(tags &&
  45            tags->eccResult > YAFFS_ECC_RESULT_NO_ERROR){
  46
  47                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->nChunksPerBlock);
  48                 yaffs_HandleChunkError(dev,bi);
  49         }
  50
  51         return result;
  52 }
  53
  54 int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
  55                                                    int chunkInNAND,
  56                                                    const __u8 * buffer,
  57                                                    yaffs_ExtendedTags * tags)
  58 {
  59         chunkInNAND -= dev->chunkOffset;
  60
  61
  62         if (tags) {
  63                 tags->sequenceNumber = dev->sequenceNumber;
  64                 tags->chunkUsed = 1;
  65                 if (!yaffs_ValidateTags(tags)) {
  66                         T(YAFFS_TRACE_ERROR,
  67                           (TSTR("Writing uninitialised tags" TENDSTR)));
  68                         YBUG();
  69                 }
  70                 T(YAFFS_TRACE_WRITE,
  71                   (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
  72                    tags->objectId, tags->chunkId));
  73         } else {
  74                 T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
  75                 YBUG();
  76         }
  77
  78         if (dev->writeChunkWithTagsToNAND)
  79                 return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
  80                                                      tags);
  81         else
  82                 return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
  83                                                                        chunkInNAND,
  84                                                                        buffer,
  85                                                                        tags);
  86 }
  87
  88 int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo)
  89 {
  90         blockNo -= dev->blockOffset;
  91
  92 ;
  93         if (dev->markNANDBlockBad)
  94                 return dev->markNANDBlockBad(dev, blockNo);
  95         else
  96                 return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
  97 }
  98
  99 int yaffs_QueryInitialBlockState(yaffs_Device * dev,
 100                                                  int blockNo,
 101                                                  yaffs_BlockState * state,
 102                                                  __u32 *sequenceNumber)
 103 {
 104         blockNo -= dev->blockOffset;
 105
 106         if (dev->queryNANDBlock)
 107                 return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
 108         else
 109                 return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
 110                                                              state,
 111                                                              sequenceNumber);
 112 }
 113
 114
 115 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
 116                                   int blockInNAND)
 117 {
 118         int result;
 119
 120         blockInNAND -= dev->blockOffset;
 121
 122
 123         dev->nBlockErasures++;
 124         result = dev->eraseBlockInNAND(dev, blockInNAND);
 125
 126         return result;
 127 }
 128
 129 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 130 {
 131         return dev->initialiseNAND(dev);
 132 }
 133
 134
 135