yaffs_mtdif2.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  * yaffs_mtdif.c  NAND mtd wrapper functions.
   4  *
   5  * Copyright (C) 2002 Aleph One Ltd.
   6  *   for Toby Churchill Ltd and Brightstar Engineering
   7  *
   8  * Created by Charles Manning <charles@aleph1.co.uk>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15
  16 // mtd interface for YAFFS2
  17
  18 const char *yaffs_mtdif2_c_version = "$Id: yaffs_mtdif2.c,v 1.3 2005-07-20 18:57:05 charles Exp $";
  19
  20 #ifdef CONFIG_YAFFS_MTD_ENABLED
  21
  22 #include "yportenv.h"
  23
  24 #include "yaffs_mtdif2.h"
  25
  26 #include "linux/mtd/mtd.h"
  27 #include "linux/types.h"
  28 #include "linux/time.h"
  29
  30 #include "yaffs_packedtags2.h"
  31
  32
  33
  34
  35 int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags)
  36 {
  37         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  38         size_t dummy;
  39         int retval = 0;
  40
  41
  42         loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
  43
  44         yaffs_PackedTags2 pt;
  45
  46         T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p" TENDSTR),chunkInNAND,data,tags));
  47
  48         if(tags)
  49         {
  50                 yaffs_PackTags2(&pt,tags);
  51         }
  52
  53 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  54         if(data && tags)
  55         {
  56                 if(dev->useNANDECC)
  57                   retval = mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,(__u8 *)&pt,NULL);
  58                 else
  59                   retval = mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,(__u8 *)&pt,NULL);
  60         }
  61         else
  62         {
  63 #endif
  64         if(data)
  65                 retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
  66         if(tags)
  67                 retval = mtd->write_oob(mtd,addr,mtd->oobsize,&dummy,(__u8 *)&pt);
  68
  69 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  70         }
  71 #endif
  72
  73     if (retval == 0)
  74         return YAFFS_OK;
  75     else
  76         return YAFFS_FAIL;
  77 }
  78
  79 int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
  80 {
  81         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  82         size_t dummy;
  83         int retval = 0;
  84
  85
  86         loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
  87
  88         yaffs_PackedTags2 pt;
  89
  90         T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_ReadChunkWithTagsToNAND chunk %d data %p tags %p" TENDSTR),chunkInNAND,data,tags));
  91
  92 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  93         if(data && tags)
  94         {
  95                 if(dev->useNANDECC)
  96                 {
  97                         retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,dev->spareBuffer,NULL);
  98                 }
  99                 else
 100                 {
 101                         retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,dev->spareBuffer,NULL);
 102                 }
 103         }
 104         else
 105         {
 106 #endif
 107         if(data)
 108                 retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);
 109         if(tags)
 110                 retval = mtd->read_oob(mtd,addr,mtd->oobsize,&dummy,dev->spareBuffer);
 111 #ifndef CONFIG_YAFFS_USE_OLD_MTD
 112         }
 113 #endif
 114
 115     memcpy(&pt,dev->spareBuffer,sizeof(pt));
 116
 117     if(tags)
 118         yaffs_UnpackTags2(tags,&pt);
 119
 120     if (retval == 0)
 121         return YAFFS_OK;
 122     else
 123         return YAFFS_FAIL;
 124 }
 125
 126 int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 127 {
 128         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 129         int retval;
 130         T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR),blockNo));
 131
 132
 133         retval = mtd->block_markbad(mtd,blockNo * dev->nChunksPerBlock * dev->nBytesPerChunk);
 134
 135     if (retval == 0)
 136         return YAFFS_OK;
 137     else
 138         return YAFFS_FAIL;
 139
 140 }
 141
 142 int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
 143 {
 144         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 145         int retval;
 146
 147         T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR),blockNo));
 148         retval = mtd->block_isbad(mtd,blockNo* dev->nChunksPerBlock * dev->nBytesPerChunk);
 149
 150         if(retval)
 151         {
 152                 T(YAFFS_TRACE_MTD,(TSTR("block is bad" TENDSTR)));
 153
 154                 *state = YAFFS_BLOCK_STATE_DEAD;
 155                 *sequenceNumber = 0;
 156         }
 157         else
 158         {
 159                 yaffs_ExtendedTags t;
 160                 nandmtd2_ReadChunkWithTagsFromNAND(dev,blockNo * dev->nChunksPerBlock,NULL, &t);
 161
 162                 if(t.chunkUsed)
 163                 {
 164                   *sequenceNumber = t.sequenceNumber;
 165                   *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
 166                 }
 167                 else
 168                 {
 169                   *sequenceNumber = 0;
 170                   *state = YAFFS_BLOCK_STATE_EMPTY;
 171                 }
 172         }
 173                 T(YAFFS_TRACE_MTD,(TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,*state));
 174
 175     if (retval == 0)
 176         return YAFFS_OK;
 177     else
 178         return YAFFS_FAIL;
 179 }
 180
 181 #endif
 182
 183
 184