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 =
  19     "$Id: yaffs_mtdif2.c,v 1.9 2005-12-07 21:49:18 charles Exp $";
  20
  21 #include "yportenv.h"
  22
  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 int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
  33                                       const __u8 * data,
  34                                       const yaffs_ExtendedTags * tags)
  35 {
  36         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  37         size_t dummy;
  38         int retval = 0;
  39
  40         loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;
  41
  42         yaffs_PackedTags2 pt;
  43
  44         T(YAFFS_TRACE_MTD,
  45           (TSTR
  46            ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
  47             TENDSTR), chunkInNAND, data, tags));
  48
  49         if (tags) {
  50                 yaffs_PackTags2(&pt, tags);
  51         }
  52
  53         if (data && tags) {
  54                 if (dev->useNANDECC)
  55                         retval =
  56                             mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,
  57                                            &dummy, data, (__u8 *) & pt, NULL);
  58                 else
  59                         retval =
  60                             mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,
  61                                            &dummy, data, (__u8 *) & pt, NULL);
  62         } else {
  63                 if (data)
  64                         retval =
  65                             mtd->write(mtd, addr, dev->nBytesPerChunk, &dummy,
  66                                        data);
  67                 if (tags)
  68                         retval =
  69                             mtd->write_oob(mtd, addr, mtd->oobsize, &dummy,
  70                                            (__u8 *) & pt);
  71
  72         }
  73
  74         if (retval == 0)
  75                 return YAFFS_OK;
  76         else
  77                 return YAFFS_FAIL;
  78 }
  79
  80 int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
  81                                        __u8 * data, yaffs_ExtendedTags * tags)
  82 {
  83         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  84         size_t dummy;
  85         int retval = 0;
  86
  87         loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;
  88
  89         yaffs_PackedTags2 pt;
  90
  91         T(YAFFS_TRACE_MTD,
  92           (TSTR
  93            ("nandmtd2_ReadChunkWithTagsToNAND chunk %d data %p tags %p"
  94             TENDSTR), chunkInNAND, data, tags));
  95
  96         if (1 ||  /* Always do this */
  97             data && tags) {
  98                 if (dev->useNANDECC) {
  99                         retval =
 100                             mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,
 101                                           &dummy, data, dev->spareBuffer,
 102                                           NULL);
 103                 } else {
 104                         retval =
 105                             mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,
 106                                           &dummy, data, dev->spareBuffer,
 107                                           NULL);
 108                 }
 109         } else {
 110                 if (data)
 111                         retval =
 112                             mtd->read(mtd, addr, dev->nBytesPerChunk, &dummy,
 113                                       data);
 114                 if (tags)
 115                         retval =
 116                             mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
 117                                           dev->spareBuffer);
 118         }
 119
 120         memcpy(&pt, dev->spareBuffer, sizeof(pt));
 121
 122         if (tags)
 123                 yaffs_UnpackTags2(tags, &pt);
 124
 125         if (retval == 0)
 126                 return YAFFS_OK;
 127         else
 128                 return YAFFS_FAIL;
 129 }
 130
 131 int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 132 {
 133         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 134         int retval;
 135         T(YAFFS_TRACE_MTD,
 136           (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
 137
 138         retval =
 139             mtd->block_markbad(mtd,
 140                                blockNo * dev->nChunksPerBlock *
 141                                dev->nBytesPerChunk);
 142
 143         if (retval == 0)
 144                 return YAFFS_OK;
 145         else
 146                 return YAFFS_FAIL;
 147
 148 }
 149
 150 int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
 151                             yaffs_BlockState * state, int *sequenceNumber)
 152 {
 153         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 154         int retval;
 155
 156         T(YAFFS_TRACE_MTD,
 157           (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
 158         retval =
 159             mtd->block_isbad(mtd,
 160                              blockNo * dev->nChunksPerBlock *
 161                              dev->nBytesPerChunk);
 162
 163         if (retval) {
 164                 T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
 165
 166                 *state = YAFFS_BLOCK_STATE_DEAD;
 167                 *sequenceNumber = 0;
 168         } else {
 169                 yaffs_ExtendedTags t;
 170                 nandmtd2_ReadChunkWithTagsFromNAND(dev,
 171                                                    blockNo *
 172                                                    dev->nChunksPerBlock, NULL,
 173                                                    &t);
 174
 175                 if (t.chunkUsed) {
 176                         *sequenceNumber = t.sequenceNumber;
 177                         *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
 178                 } else {
 179                         *sequenceNumber = 0;
 180                         *state = YAFFS_BLOCK_STATE_EMPTY;
 181                 }
 182         }
 183         T(YAFFS_TRACE_MTD,
 184           (TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,
 185            *state));
 186
 187         if (retval == 0)
 188                 return YAFFS_OK;
 189         else
 190                 return YAFFS_FAIL;
 191 }
 192