target/linux/generic-2.6/files/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
  18 #include "yportenv.h"
  19
  20
  21 #include "yaffs_mtdif2.h"
  22
  23 #include "linux/mtd/mtd.h"
  24 #include "linux/types.h"
  25 #include "linux/time.h"
  26
  27 #include "yaffs_packedtags2.h"
  28
  29 int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
  30                                       const __u8 * data,
  31                                       const yaffs_ExtendedTags * tags)
  32 {
  33         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  34 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  35         struct mtd_oob_ops ops;
  36 #else
  37         size_t dummy;
  38 #endif
  39         int retval = 0;
  40
  41         loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
  42
  43         yaffs_PackedTags2 pt;
  44
  45         T(YAFFS_TRACE_MTD,
  46           (TSTR
  47            ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
  48             TENDSTR), chunkInNAND, data, tags));
  49
  50 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  51         if (tags)
  52                 yaffs_PackTags2(&pt, tags);
  53         else
  54                 BUG(); /* both tags and data should always be present */
  55
  56         if (data) {
  57                 ops.mode = MTD_OOB_AUTO;
  58                 ops.ooblen = sizeof(pt);
  59                 ops.len = dev->nDataBytesPerChunk;
  60                 ops.ooboffs = 0;
  61                 ops.datbuf = (__u8 *)data;
  62                 ops.oobbuf = (void *)&pt;
  63                 retval = mtd->write_oob(mtd, addr, &ops);
  64         } else
  65                 BUG(); /* both tags and data should always be present */
  66 #else
  67         if (tags) {
  68                 yaffs_PackTags2(&pt, tags);
  69         }
  70
  71         if (data && tags) {
  72                 if (dev->useNANDECC)
  73                         retval =
  74                             mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
  75                                            &dummy, data, (__u8 *) & pt, NULL);
  76                 else
  77                         retval =
  78                             mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
  79                                            &dummy, data, (__u8 *) & pt, NULL);
  80         } else {
  81                 if (data)
  82                         retval =
  83                             mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
  84                                        data);
  85                 if (tags)
  86                         retval =
  87                             mtd->write_oob(mtd, addr, mtd->oobsize, &dummy,
  88                                            (__u8 *) & pt);
  89
  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 (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 104         struct mtd_oob_ops ops;
 105 #endif
 106         size_t dummy;
 107         int retval = 0;
 108
 109         loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
 110
 111         yaffs_PackedTags2 pt;
 112
 113         T(YAFFS_TRACE_MTD,
 114           (TSTR
 115            ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
 116             TENDSTR), chunkInNAND, data, tags));
 117
 118 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 119         if (data && !tags)
 120                 retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
 121                                 &dummy, data);
 122         else if (tags) {
 123                 ops.mode = MTD_OOB_AUTO;
 124                 ops.ooblen = sizeof(pt);
 125                 ops.len = data ? dev->nDataBytesPerChunk : sizeof(pt);
 126                 ops.ooboffs = 0;
 127                 ops.datbuf = data;
 128                 ops.oobbuf = dev->spareBuffer;
 129                 retval = mtd->read_oob(mtd, addr, &ops);
 130         }
 131 #else
 132         if (data && tags) {
 133                 if (dev->useNANDECC) {
 134                         retval =
 135                             mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 136                                           &dummy, data, dev->spareBuffer,
 137                                           NULL);
 138                 } else {
 139                         retval =
 140                             mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 141                                           &dummy, data, dev->spareBuffer,
 142                                           NULL);
 143                 }
 144         } else {
 145                 if (data)
 146                         retval =
 147                             mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 148                                       data);
 149                 if (tags)
 150                         retval =
 151                             mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
 152                                           dev->spareBuffer);
 153         }
 154 #endif
 155
 156         memcpy(&pt, dev->spareBuffer, sizeof(pt));
 157
 158         if (tags)
 159                 yaffs_UnpackTags2(tags, &pt);
 160
 161         if(tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR)
 162                 tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
 163
 164         if (retval == 0)
 165                 return YAFFS_OK;
 166         else
 167                 return YAFFS_FAIL;
 168 }
 169
 170 int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 171 {
 172         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 173         int retval;
 174         T(YAFFS_TRACE_MTD,
 175           (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
 176
 177         retval =
 178             mtd->block_markbad(mtd,
 179                                blockNo * dev->nChunksPerBlock *
 180                                dev->nDataBytesPerChunk);
 181
 182         if (retval == 0)
 183                 return YAFFS_OK;
 184         else
 185                 return YAFFS_FAIL;
 186
 187 }
 188
 189 int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
 190                             yaffs_BlockState * state, int *sequenceNumber)
 191 {
 192         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 193         int retval;
 194
 195         T(YAFFS_TRACE_MTD,
 196           (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
 197         retval =
 198             mtd->block_isbad(mtd,
 199                              blockNo * dev->nChunksPerBlock *
 200                              dev->nDataBytesPerChunk);
 201
 202         if (retval) {
 203                 T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
 204
 205                 *state = YAFFS_BLOCK_STATE_DEAD;
 206                 *sequenceNumber = 0;
 207         } else {
 208                 yaffs_ExtendedTags t;
 209                 nandmtd2_ReadChunkWithTagsFromNAND(dev,
 210                                                    blockNo *
 211                                                    dev->nChunksPerBlock, NULL,
 212                                                    &t);
 213
 214                 if (t.chunkUsed) {
 215                         *sequenceNumber = t.sequenceNumber;
 216                         *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
 217                 } else {
 218                         *sequenceNumber = 0;
 219                         *state = YAFFS_BLOCK_STATE_EMPTY;
 220                 }
 221         }
 222         T(YAFFS_TRACE_MTD,
 223           (TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,
 224            *state));
 225
 226         if (retval == 0)
 227                 return YAFFS_OK;
 228         else
 229                 return YAFFS_FAIL;
 230 }
 231