target/linux/generic-2.6/files-2.6.25/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 1.17 2007-02-14 01:09:06 wookey 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 int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
  31                                       const __u8 * data,
  32                                       const yaffs_ExtendedTags * tags)
  33 {
  34         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  35 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  36         struct mtd_oob_ops ops;
  37 #else
  38         size_t dummy;
  39 #endif
  40         int retval = 0;
  41
  42         loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
  43
  44         yaffs_PackedTags2 pt;
  45
  46         T(YAFFS_TRACE_MTD,
  47           (TSTR
  48            ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
  49             TENDSTR), chunkInNAND, data, tags));
  50
  51 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  52         if (tags)
  53                 yaffs_PackTags2(&pt, tags);
  54         else
  55                 BUG(); /* both tags and data should always be present */
  56
  57         if (data) {
  58                 ops.mode = MTD_OOB_AUTO;
  59                 ops.ooblen = sizeof(pt);
  60                 ops.len = dev->nDataBytesPerChunk;
  61                 ops.ooboffs = 0;
  62                 ops.datbuf = (__u8 *)data;
  63                 ops.oobbuf = (void *)&pt;
  64                 retval = mtd->write_oob(mtd, addr, &ops);
  65         } else
  66                 BUG(); /* both tags and data should always be present */
  67 #else
  68         if (tags) {
  69                 yaffs_PackTags2(&pt, tags);
  70         }
  71
  72         if (data && tags) {
  73                 if (dev->useNANDECC)
  74                         retval =
  75                             mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
  76                                            &dummy, data, (__u8 *) & pt, NULL);
  77                 else
  78                         retval =
  79                             mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
  80                                            &dummy, data, (__u8 *) & pt, NULL);
  81         } else {
  82                 if (data)
  83                         retval =
  84                             mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
  85                                        data);
  86                 if (tags)
  87                         retval =
  88                             mtd->write_oob(mtd, addr, mtd->oobsize, &dummy,
  89                                            (__u8 *) & pt);
  90
  91         }
  92 #endif
  93
  94         if (retval == 0)
  95                 return YAFFS_OK;
  96         else
  97                 return YAFFS_FAIL;
  98 }
  99
 100 int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
 101                                        __u8 * data, yaffs_ExtendedTags * tags)
 102 {
 103         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 104 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 105         struct mtd_oob_ops ops;
 106 #endif
 107         size_t dummy;
 108         int retval = 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 (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 120         if (data && !tags)
 121                 retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
 122                                 &dummy, data);
 123         else if (tags) {
 124                 ops.mode = MTD_OOB_AUTO;
 125                 ops.ooblen = sizeof(pt);
 126                 ops.len = data ? dev->nDataBytesPerChunk : sizeof(pt);
 127                 ops.ooboffs = 0;
 128                 ops.datbuf = data;
 129                 ops.oobbuf = dev->spareBuffer;
 130                 retval = mtd->read_oob(mtd, addr, &ops);
 131         }
 132 #else
 133         if (data && tags) {
 134                 if (dev->useNANDECC) {
 135                         retval =
 136                             mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 137                                           &dummy, data, dev->spareBuffer,
 138                                           NULL);
 139                 } else {
 140                         retval =
 141                             mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 142                                           &dummy, data, dev->spareBuffer,
 143                                           NULL);
 144                 }
 145         } else {
 146                 if (data)
 147                         retval =
 148                             mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 149                                       data);
 150                 if (tags)
 151                         retval =
 152                             mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
 153                                           dev->spareBuffer);
 154         }
 155 #endif
 156
 157         memcpy(&pt, dev->spareBuffer, sizeof(pt));
 158
 159         if (tags)
 160                 yaffs_UnpackTags2(tags, &pt);
 161
 162         if(tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR)
 163                 tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
 164
 165         if (retval == 0)
 166                 return YAFFS_OK;
 167         else
 168                 return YAFFS_FAIL;
 169 }
 170
 171 int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 172 {
 173         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 174         int retval;
 175         T(YAFFS_TRACE_MTD,
 176           (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
 177
 178         retval =
 179             mtd->block_markbad(mtd,
 180                                blockNo * dev->nChunksPerBlock *
 181                                dev->nDataBytesPerChunk);
 182
 183         if (retval == 0)
 184                 return YAFFS_OK;
 185         else
 186                 return YAFFS_FAIL;
 187
 188 }
 189
 190 int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
 191                             yaffs_BlockState * state, int *sequenceNumber)
 192 {
 193         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 194         int retval;
 195
 196         T(YAFFS_TRACE_MTD,
 197           (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
 198         retval =
 199             mtd->block_isbad(mtd,
 200                              blockNo * dev->nChunksPerBlock *
 201                              dev->nDataBytesPerChunk);
 202
 203         if (retval) {
 204                 T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
 205
 206                 *state = YAFFS_BLOCK_STATE_DEAD;
 207                 *sequenceNumber = 0;
 208         } else {
 209                 yaffs_ExtendedTags t;
 210                 nandmtd2_ReadChunkWithTagsFromNAND(dev,
 211                                                    blockNo *
 212                                                    dev->nChunksPerBlock, NULL,
 213                                                    &t);
 214
 215                 if (t.chunkUsed) {
 216                         *sequenceNumber = t.sequenceNumber;
 217                         *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
 218                 } else {
 219                         *sequenceNumber = 0;
 220                         *state = YAFFS_BLOCK_STATE_EMPTY;
 221                 }
 222         }
 223         T(YAFFS_TRACE_MTD,
 224           (TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,
 225            *state));
 226
 227         if (retval == 0)
 228                 return YAFFS_OK;
 229         else
 230                 return YAFFS_FAIL;
 231 }
 232