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 1.1 2006-05-08 10:13:34 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         chunkInNAND -= dev->chunkOffset;
  28
  29         if (dev->readChunkWithTagsFromNAND)
  30                 return dev->readChunkWithTagsFromNAND(dev, chunkInNAND, buffer,
  31                                                       tags);
  32         else
  33                 return yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
  34                                                                         chunkInNAND,
  35                                                                         buffer,
  36                                                                         tags);
  37 }
  38
  39 int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
  40                                                    int chunkInNAND,
  41                                                    const __u8 * buffer,
  42                                                    yaffs_ExtendedTags * tags)
  43 {
  44         chunkInNAND -= dev->chunkOffset;
  45
  46
  47         if (tags) {
  48                 tags->sequenceNumber = dev->sequenceNumber;
  49                 tags->chunkUsed = 1;
  50                 if (!yaffs_ValidateTags(tags)) {
  51                         T(YAFFS_TRACE_ERROR,
  52                           (TSTR("Writing uninitialised tags" TENDSTR)));
  53                         YBUG();
  54                 }
  55                 T(YAFFS_TRACE_WRITE,
  56                   (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
  57                    tags->objectId, tags->chunkId));
  58         } else {
  59                 T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
  60                 YBUG();
  61         }
  62
  63         if (dev->writeChunkWithTagsToNAND)
  64                 return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
  65                                                      tags);
  66         else
  67                 return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
  68                                                                        chunkInNAND,
  69                                                                        buffer,
  70                                                                        tags);
  71 }
  72
  73 int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo)
  74 {
  75         blockNo -= dev->blockOffset;
  76
  77 ;
  78         if (dev->markNANDBlockBad)
  79                 return dev->markNANDBlockBad(dev, blockNo);
  80         else
  81                 return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
  82 }
  83
  84 int yaffs_QueryInitialBlockState(yaffs_Device * dev,
  85                                                  int blockNo,
  86                                                  yaffs_BlockState * state,
  87                                                  unsigned *sequenceNumber)
  88 {
  89         blockNo -= dev->blockOffset;
  90
  91         if (dev->queryNANDBlock)
  92                 return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
  93         else
  94                 return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
  95                                                              state,
  96                                                              sequenceNumber);
  97 }
  98
  99
 100 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
 101                                   int blockInNAND)
 102 {
 103         int result;
 104
 105         blockInNAND -= dev->blockOffset;
 106
 107
 108         dev->nBlockErasures++;
 109         result = dev->eraseBlockInNAND(dev, blockInNAND);
 110
 111         /* If at first we don't succeed, try again *once*.*/
 112         if (!result)
 113                 result = dev->eraseBlockInNAND(dev, blockInNAND);
 114         return result;
 115 }
 116
 117 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 118 {
 119         return dev->initialiseNAND(dev);
 120 }
 121
 122
 123