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 1.2 2006-09-21 08:13:59 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
  29         int realignedChunkInNAND = chunkInNAND - dev->chunkOffset;
  30
  31         if (dev->readChunkWithTagsFromNAND)
  32                 result = dev->readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
  33                                                       tags);
  34         else
  35                 result = yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
  36                                                                         realignedChunkInNAND,
  37                                                                         buffer,
  38                                                                         tags);
  39         if(tags &&
  40            tags->eccResult > YAFFS_ECC_RESULT_NO_ERROR){
  41
  42                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->nChunksPerBlock);
  43                 bi->gcPrioritise = 1;
  44         }
  45
  46         return result;
  47 }
  48
  49 int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
  50                                                    int chunkInNAND,
  51                                                    const __u8 * buffer,
  52                                                    yaffs_ExtendedTags * tags)
  53 {
  54         chunkInNAND -= dev->chunkOffset;
  55
  56
  57         if (tags) {
  58                 tags->sequenceNumber = dev->sequenceNumber;
  59                 tags->chunkUsed = 1;
  60                 if (!yaffs_ValidateTags(tags)) {
  61                         T(YAFFS_TRACE_ERROR,
  62                           (TSTR("Writing uninitialised tags" TENDSTR)));
  63                         YBUG();
  64                 }
  65                 T(YAFFS_TRACE_WRITE,
  66                   (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
  67                    tags->objectId, tags->chunkId));
  68         } else {
  69                 T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
  70                 YBUG();
  71         }
  72
  73         if (dev->writeChunkWithTagsToNAND)
  74                 return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
  75                                                      tags);
  76         else
  77                 return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
  78                                                                        chunkInNAND,
  79                                                                        buffer,
  80                                                                        tags);
  81 }
  82
  83 int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo)
  84 {
  85         blockNo -= dev->blockOffset;
  86
  87 ;
  88         if (dev->markNANDBlockBad)
  89                 return dev->markNANDBlockBad(dev, blockNo);
  90         else
  91                 return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
  92 }
  93
  94 int yaffs_QueryInitialBlockState(yaffs_Device * dev,
  95                                                  int blockNo,
  96                                                  yaffs_BlockState * state,
  97                                                  unsigned *sequenceNumber)
  98 {
  99         blockNo -= dev->blockOffset;
 100
 101         if (dev->queryNANDBlock)
 102                 return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
 103         else
 104                 return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
 105                                                              state,
 106                                                              sequenceNumber);
 107 }
 108
 109
 110 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
 111                                   int blockInNAND)
 112 {
 113         int result;
 114
 115         blockInNAND -= dev->blockOffset;
 116
 117
 118         dev->nBlockErasures++;
 119         result = dev->eraseBlockInNAND(dev, blockInNAND);
 120
 121         /* If at first we don't succeed, try again *once*.*/
 122         if (!result)
 123                 result = dev->eraseBlockInNAND(dev, blockInNAND);
 124         return result;
 125 }
 126
 127 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 128 {
 129         return dev->initialiseNAND(dev);
 130 }
 131
 132
 133