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 1.11 2009-09-09 03:03:01 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         dev->nPageReads++;
  33
  34         /* If there are no tags provided, use local tags to get prioritised gc working */
  35         if (!tags)
  36                 tags = &localTags;
  37
  38         if (dev->readChunkWithTagsFromNAND)
  39                 result = dev->readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
  40                                                       tags);
  41         else
  42                 result = yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
  43                                                                         realignedChunkInNAND,
  44                                                                         buffer,
  45                                                                         tags);
  46         if (tags &&
  47            tags->eccResult > YAFFS_ECC_RESULT_NO_ERROR) {
  48
  49                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->nChunksPerBlock);
  50                 yaffs_HandleChunkError(dev, bi);
  51         }
  52
  53         return result;
  54 }
  55
  56 int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,
  57                                                    int chunkInNAND,
  58                                                    const __u8 *buffer,
  59                                                    yaffs_ExtendedTags *tags)
  60 {
  61
  62         dev->nPageWrites++;
  63
  64         chunkInNAND -= dev->chunkOffset;
  65
  66
  67         if (tags) {
  68                 tags->sequenceNumber = dev->sequenceNumber;
  69                 tags->chunkUsed = 1;
  70                 if (!yaffs_ValidateTags(tags)) {
  71                         T(YAFFS_TRACE_ERROR,
  72                           (TSTR("Writing uninitialised tags" TENDSTR)));
  73                         YBUG();
  74                 }
  75                 T(YAFFS_TRACE_WRITE,
  76                   (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
  77                    tags->objectId, tags->chunkId));
  78         } else {
  79                 T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
  80                 YBUG();
  81         }
  82
  83         if (dev->writeChunkWithTagsToNAND)
  84                 return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
  85                                                      tags);
  86         else
  87                 return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
  88                                                                        chunkInNAND,
  89                                                                        buffer,
  90                                                                        tags);
  91 }
  92
  93 int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo)
  94 {
  95         blockNo -= dev->blockOffset;
  96
  97
  98         if (dev->markNANDBlockBad)
  99                 return dev->markNANDBlockBad(dev, blockNo);
 100         else
 101                 return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
 102 }
 103
 104 int yaffs_QueryInitialBlockState(yaffs_Device *dev,
 105                                                  int blockNo,
 106                                                  yaffs_BlockState *state,
 107                                                  __u32 *sequenceNumber)
 108 {
 109         blockNo -= dev->blockOffset;
 110
 111         if (dev->queryNANDBlock)
 112                 return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
 113         else
 114                 return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
 115                                                              state,
 116                                                              sequenceNumber);
 117 }
 118
 119
 120 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
 121                                   int blockInNAND)
 122 {
 123         int result;
 124
 125         blockInNAND -= dev->blockOffset;
 126
 127         dev->nBlockErasures++;
 128
 129         result = dev->eraseBlockInNAND(dev, blockInNAND);
 130
 131         return result;
 132 }
 133
 134 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 135 {
 136         return dev->initialiseNAND(dev);
 137 }
 138
 139
 140