target/linux/generic-2.6/files-2.6.26/fs/yaffs2/yaffs_mtdif2.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 /* mtd interface for YAFFS2 */
  15
  16 const char *yaffs_mtdif2_c_version =
  17     "$Id: yaffs_mtdif2.c,v 1.20 2008-05-05 07:58:58 charles Exp $";
  18
  19 #include "yportenv.h"
  20
  21
  22 #include "yaffs_mtdif2.h"
  23
  24 #include "linux/mtd/mtd.h"
  25 #include "linux/types.h"
  26 #include "linux/time.h"
  27
  28 #include "yaffs_packedtags2.h"
  29
  30 /* NB For use with inband tags....
  31  * We assume that the data buffer is of size totalBytersPerChunk so that we can also
  32  * use it to load the tags.
  33  */
  34 int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
  35                                       const __u8 * data,
  36                                       const yaffs_ExtendedTags * tags)
  37 {
  38         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  39 #if (MTD_VERSION_CODE > MTD_VERSION(2,6,17))
  40         struct mtd_oob_ops ops;
  41 #else
  42         size_t dummy;
  43 #endif
  44         int retval = 0;
  45
  46         loff_t addr;
  47
  48         yaffs_PackedTags2 pt;
  49
  50         T(YAFFS_TRACE_MTD,
  51           (TSTR
  52            ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
  53             TENDSTR), chunkInNAND, data, tags));
  54
  55
  56         addr  = ((loff_t) chunkInNAND) * dev->totalBytesPerChunk;
  57
  58         /* For yaffs2 writing there must be both data and tags.
  59          * If we're using inband tags, then the tags are stuffed into
  60          * the end of the data buffer.
  61          */
  62         if(!data || !tags)
  63                 BUG();
  64         else if(dev->inbandTags){
  65                 yaffs_PackedTags2TagsPart *pt2tp;
  66                 pt2tp = (yaffs_PackedTags2TagsPart *)(data + dev->nDataBytesPerChunk);
  67                 yaffs_PackTags2TagsPart(pt2tp,tags);
  68         }
  69         else
  70                 yaffs_PackTags2(&pt, tags);
  71
  72 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  73         ops.mode = MTD_OOB_AUTO;
  74         ops.ooblen = (dev->inbandTags) ? 0 : sizeof(pt);
  75         ops.len = dev->totalBytesPerChunk;
  76         ops.ooboffs = 0;
  77         ops.datbuf = (__u8 *)data;
  78         ops.oobbuf = (dev->inbandTags) ? NULL : (void *)&pt;
  79         retval = mtd->write_oob(mtd, addr, &ops);
  80
  81 #else
  82         if (!dev->inbandTags) {
  83                 retval =
  84                     mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
  85                                    &dummy, data, (__u8 *) & pt, NULL);
  86         } else {
  87                 retval =
  88                     mtd->write(mtd, addr, dev->totalBytesPerChunk, &dummy,
  89                                data);
  90         }
  91 #endif
  92
  93         if (retval == 0)
  94                 return YAFFS_OK;
  95         else
  96                 return YAFFS_FAIL;
  97 }
  98
  99 int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
 100                                        __u8 * data, yaffs_ExtendedTags * tags)
 101 {
 102         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 103 #if (MTD_VERSION_CODE > MTD_VERSION(2,6,17))
 104         struct mtd_oob_ops ops;
 105 #endif
 106         size_t dummy;
 107         int retval = 0;
 108         int localData = 0;
 109
 110         loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
 111
 112         yaffs_PackedTags2 pt;
 113
 114         T(YAFFS_TRACE_MTD,
 115           (TSTR
 116            ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
 117             TENDSTR), chunkInNAND, data, tags));
 118
 119         if(dev->inbandTags){
 120
 121                 if(!data) {
 122                         localData = 1;
 123                         data = yaffs_GetTempBuffer(dev,__LINE__);
 124                 }
 125
 126
 127         }
 128
 129
 130 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 131         if (dev->inbandTags || (data && !tags))
 132                 retval = mtd->read(mtd, addr, dev->totalBytesPerChunk,
 133                                 &dummy, data);
 134         else if (tags) {
 135                 ops.mode = MTD_OOB_AUTO;
 136                 ops.ooblen = sizeof(pt);
 137                 ops.len = data ? dev->nDataBytesPerChunk : sizeof(pt);
 138                 ops.ooboffs = 0;
 139                 ops.datbuf = data;
 140                 ops.oobbuf = dev->spareBuffer;
 141                 retval = mtd->read_oob(mtd, addr, &ops);
 142         }
 143 #else
 144         if (!dev->inbandTags && data && tags) {
 145
 146                 retval = mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 147                                           &dummy, data, dev->spareBuffer,
 148                                           NULL);
 149         } else {
 150                 if (data)
 151                         retval =
 152                             mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 153                                       data);
 154                 if (!dev->inbandTags && tags)
 155                         retval =
 156                             mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
 157                                           dev->spareBuffer);
 158         }
 159 #endif
 160
 161
 162         if(dev->inbandTags){
 163                 if(tags){
 164                         yaffs_PackedTags2TagsPart * pt2tp;
 165                         pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];
 166                         yaffs_UnpackTags2TagsPart(tags,pt2tp);
 167                 }
 168         }
 169         else {
 170                 if (tags){
 171                         memcpy(&pt, dev->spareBuffer, sizeof(pt));
 172                         yaffs_UnpackTags2(tags, &pt);
 173                 }
 174         }
 175
 176         if(localData)
 177                 yaffs_ReleaseTempBuffer(dev,data,__LINE__);
 178
 179         if(tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR)
 180                 tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
 181         if (retval == 0)
 182                 return YAFFS_OK;
 183         else
 184                 return YAFFS_FAIL;
 185 }
 186
 187 int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 188 {
 189         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 190         int retval;
 191         T(YAFFS_TRACE_MTD,
 192           (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
 193
 194         retval =
 195             mtd->block_markbad(mtd,
 196                                blockNo * dev->nChunksPerBlock *
 197                                dev->nDataBytesPerChunk);
 198
 199         if (retval == 0)
 200                 return YAFFS_OK;
 201         else
 202                 return YAFFS_FAIL;
 203
 204 }
 205
 206 int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
 207                             yaffs_BlockState * state, int *sequenceNumber)
 208 {
 209         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 210         int retval;
 211
 212         T(YAFFS_TRACE_MTD,
 213           (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
 214         retval =
 215             mtd->block_isbad(mtd,
 216                              blockNo * dev->nChunksPerBlock *
 217                              dev->nDataBytesPerChunk);
 218
 219         if (retval) {
 220                 T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
 221
 222                 *state = YAFFS_BLOCK_STATE_DEAD;
 223                 *sequenceNumber = 0;
 224         } else {
 225                 yaffs_ExtendedTags t;
 226                 nandmtd2_ReadChunkWithTagsFromNAND(dev,
 227                                                    blockNo *
 228                                                    dev->nChunksPerBlock, NULL,
 229                                                    &t);
 230
 231                 if (t.chunkUsed) {
 232                         *sequenceNumber = t.sequenceNumber;
 233                         *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
 234                 } else {
 235                         *sequenceNumber = 0;
 236                         *state = YAFFS_BLOCK_STATE_EMPTY;
 237                 }
 238         }
 239         T(YAFFS_TRACE_MTD,
 240           (TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,
 241            *state));
 242
 243         if (retval == 0)
 244                 return YAFFS_OK;
 245         else
 246                 return YAFFS_FAIL;
 247 }
 248