yaffs_nand.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2010 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 #include "yaffs_nand.h"
  15 #include "yaffs_tagscompat.h"
  16 #include "yaffs_tagsvalidity.h"
  17
  18 #include "yaffs_getblockinfo.h"
  19
  20 int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev, int chunkInNAND,
  21                                            __u8 *buffer,
  22                                            yaffs_ExtendedTags *tags)
  23 {
  24         int result;
  25         yaffs_ExtendedTags localTags;
  26
  27         int realignedChunkInNAND = chunkInNAND - dev->chunkOffset;
  28
  29         dev->nPageReads++;
  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->param.readChunkWithTagsFromNAND)
  36                 result = dev->param.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->param.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
  59         dev->nPageWrites++;
  60
  61         chunkInNAND -= dev->chunkOffset;
  62
  63
  64         if (tags) {
  65                 tags->sequenceNumber = dev->sequenceNumber;
  66                 tags->chunkUsed = 1;
  67                 if (!yaffs_ValidateTags(tags)) {
  68                         T(YAFFS_TRACE_ERROR,
  69                           (TSTR("Writing uninitialised tags" TENDSTR)));
  70                         YBUG();
  71                 }
  72                 T(YAFFS_TRACE_WRITE,
  73                   (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
  74                    tags->objectId, tags->chunkId));
  75         } else {
  76                 T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
  77                 YBUG();
  78         }
  79
  80         if (dev->param.writeChunkWithTagsToNAND)
  81                 return dev->param.writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
  82                                                      tags);
  83         else
  84                 return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
  85                                                                        chunkInNAND,
  86                                                                        buffer,
  87                                                                        tags);
  88 }
  89
  90 int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo)
  91 {
  92         blockNo -= dev->blockOffset;
  93
  94
  95         if (dev->param.markNANDBlockBad)
  96                 return dev->param.markNANDBlockBad(dev, blockNo);
  97         else
  98                 return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
  99 }
 100
 101 int yaffs_QueryInitialBlockState(yaffs_Device *dev,
 102                                                  int blockNo,
 103                                                  yaffs_BlockState *state,
 104                                                  __u32 *sequenceNumber)
 105 {
 106         blockNo -= dev->blockOffset;
 107
 108         if (dev->param.queryNANDBlock)
 109                 return dev->param.queryNANDBlock(dev, blockNo, state, sequenceNumber);
 110         else
 111                 return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
 112                                                              state,
 113                                                              sequenceNumber);
 114 }
 115
 116
 117 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
 118                                   int blockInNAND)
 119 {
 120         int result;
 121
 122         blockInNAND -= dev->blockOffset;
 123
 124         dev->nBlockErasures++;
 125
 126         result = dev->param.eraseBlockInNAND(dev, blockInNAND);
 127
 128         return result;
 129 }
 130
 131 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 132 {
 133         if(dev->param.initialiseNAND)
 134                 return dev->param.initialiseNAND(dev);
 135         return YAFFS_OK;
 136 }
 137
 138
 139