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