yaffs_nand.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002 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
  15 const char *yaffs_nand_c_version =
  16     "$Id: yaffs_nand.c,v 1.3 2006-10-03 10:13:03 charles Exp $";
  17
  18 #include "yaffs_nand.h"
  19 #include "yaffs_tagscompat.h"
  20 #include "yaffs_tagsvalidity.h"
  21
  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                 bi->gcPrioritise = 1;
  49                 dev->hasPendingPrioritisedGCs = 1;
  50         }
  51
  52         return result;
  53 }
  54
  55 int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
  56                                                    int chunkInNAND,
  57                                                    const __u8 * buffer,
  58                                                    yaffs_ExtendedTags * tags)
  59 {
  60         chunkInNAND -= dev->chunkOffset;
  61
  62
  63         if (tags) {
  64                 tags->sequenceNumber = dev->sequenceNumber;
  65                 tags->chunkUsed = 1;
  66                 if (!yaffs_ValidateTags(tags)) {
  67                         T(YAFFS_TRACE_ERROR,
  68                           (TSTR("Writing uninitialised tags" TENDSTR)));
  69                         YBUG();
  70                 }
  71                 T(YAFFS_TRACE_WRITE,
  72                   (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
  73                    tags->objectId, tags->chunkId));
  74         } else {
  75                 T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
  76                 YBUG();
  77         }
  78
  79         if (dev->writeChunkWithTagsToNAND)
  80                 return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
  81                                                      tags);
  82         else
  83                 return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
  84                                                                        chunkInNAND,
  85                                                                        buffer,
  86                                                                        tags);
  87 }
  88
  89 int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo)
  90 {
  91         blockNo -= dev->blockOffset;
  92
  93 ;
  94         if (dev->markNANDBlockBad)
  95                 return dev->markNANDBlockBad(dev, blockNo);
  96         else
  97                 return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
  98 }
  99
 100 int yaffs_QueryInitialBlockState(yaffs_Device * dev,
 101                                                  int blockNo,
 102                                                  yaffs_BlockState * state,
 103                                                  unsigned *sequenceNumber)
 104 {
 105         blockNo -= dev->blockOffset;
 106
 107         if (dev->queryNANDBlock)
 108                 return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
 109         else
 110                 return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
 111                                                              state,
 112                                                              sequenceNumber);
 113 }
 114
 115
 116 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
 117                                   int blockInNAND)
 118 {
 119         int result;
 120
 121         blockInNAND -= dev->blockOffset;
 122
 123
 124         dev->nBlockErasures++;
 125         result = dev->eraseBlockInNAND(dev, blockInNAND);
 126
 127         /* If at first we don't succeed, try again *once*.*/
 128         if (!result)
 129                 result = dev->eraseBlockInNAND(dev, blockInNAND);
 130         return result;
 131 }
 132
 133 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 134 {
 135         return dev->initialiseNAND(dev);
 136 }
 137
 138
 139