fs/yaffs2/yaffs_nandif.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2011 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 #include "yportenv.h"
  15 #include "yaffs_guts.h"
  16
  17
  18 #include "yaffs_nandif.h"
  19 #include "yaffs_packedtags2.h"
  20
  21 #include "yramsim.h"
  22
  23 #include "yaffs_trace.h"
  24 #include "yaffsfs.h"
  25
  26
  27 /* NB For use with inband tags....
  28  * We assume that the data buffer is of size totalBytersPerChunk so that
  29  * we can also use it to load the tags.
  30  */
  31 int ynandif_WriteChunkWithTagsToNAND(struct yaffs_dev *dev, int nand_chunk,
  32                                       const u8 *data,
  33                                       const struct yaffs_ext_tags *tags)
  34 {
  35
  36         int retval = 0;
  37         struct yaffs_packed_tags2 pt;
  38         void *spare;
  39         unsigned spareSize = 0;
  40         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
  41
  42         yaffs_trace(YAFFS_TRACE_MTD,
  43                 "nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p",
  44                 nand_chunk, data, tags);
  45
  46
  47         /* For yaffs2 writing there must be both data and tags.
  48          * If we're using inband tags, then the tags are stuffed into
  49          * the end of the data buffer.
  50          */
  51
  52         if (dev->param.inband_tags) {
  53                 struct yaffs_packed_tags2_tags_only *pt2tp;
  54
  55                 pt2tp = (struct yaffs_packed_tags2_tags_only *)
  56                         (data + dev->data_bytes_per_chunk);
  57                 yaffs_pack_tags2_tags_only(pt2tp, tags);
  58                 spare = NULL;
  59                 spareSize = 0;
  60         } else {
  61                 yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
  62                 spare = &pt;
  63                 spareSize = sizeof(struct yaffs_packed_tags2);
  64         }
  65
  66         retval = geometry->writeChunk(dev, nand_chunk,
  67                                 data, dev->param.total_bytes_per_chunk,
  68                                 spare, spareSize);
  69
  70         return retval;
  71 }
  72
  73 int ynandif_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev, int nand_chunk,
  74                                        u8 *data, struct yaffs_ext_tags *tags)
  75 {
  76         struct yaffs_packed_tags2 pt;
  77         int localData = 0;
  78         void *spare = NULL;
  79         unsigned spareSize;
  80         int retval = 0;
  81         int eccStatus; /* 0 = ok, 1 = fixed, -1 = unfixed */
  82         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
  83
  84         yaffs_trace(YAFFS_TRACE_MTD,
  85                 "nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p",
  86                 nand_chunk, data, tags);
  87
  88         if (!tags) {
  89                 spare = NULL;
  90                 spareSize = 0;
  91         } else if (dev->param.inband_tags) {
  92
  93                 if (!data) {
  94                         localData = 1;
  95                         data = yaffs_get_temp_buffer(dev);
  96                 }
  97                 spare = NULL;
  98                 spareSize = 0;
  99         } else {
 100                 spare = &pt;
 101                 spareSize = sizeof(struct yaffs_packed_tags2);
 102         }
 103
 104         retval = geometry->readChunk(dev, nand_chunk,
 105                                  data,
 106                                  data ? dev->param.total_bytes_per_chunk : 0,
 107                                  spare, spareSize,
 108                                  &eccStatus);
 109
 110         if (dev->param.inband_tags) {
 111                 if (tags) {
 112                         struct yaffs_packed_tags2_tags_only *pt2tp;
 113                         pt2tp = (struct yaffs_packed_tags2_tags_only *)
 114                                         &data[dev->data_bytes_per_chunk];
 115                         yaffs_unpack_tags2_tags_only(tags, pt2tp);
 116                 }
 117         } else {
 118                 if (tags)
 119                         yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
 120         }
 121
 122         if (tags && tags->chunk_used) {
 123                 if (eccStatus < 0 ||
 124                    tags->ecc_result == YAFFS_ECC_RESULT_UNFIXED)
 125                         tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
 126                 else if (eccStatus > 0 ||
 127                              tags->ecc_result == YAFFS_ECC_RESULT_FIXED)
 128                         tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
 129                 else
 130                         tags->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
 131         }
 132
 133         if (localData)
 134                 yaffs_release_temp_buffer(dev, data);
 135
 136         return retval;
 137 }
 138
 139 int ynandif_MarkNANDBlockBad(struct yaffs_dev *dev, int blockId)
 140 {
 141         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
 142
 143         return geometry->markBlockBad(dev, blockId);
 144 }
 145
 146 int ynandif_EraseBlockInNAND(struct yaffs_dev *dev, int blockId)
 147 {
 148         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
 149
 150         return geometry->eraseBlock(dev, blockId);
 151
 152 }
 153
 154
 155 static int ynandif_IsBlockOk(struct yaffs_dev *dev, int blockId)
 156 {
 157         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
 158
 159         return geometry->checkBlockOk(dev, blockId);
 160 }
 161
 162 int ynandif_QueryNANDBlock(struct yaffs_dev *dev, int blockId,
 163                 enum yaffs_block_state *state, u32 *seq_number)
 164 {
 165         unsigned chunkNo;
 166         struct yaffs_ext_tags tags;
 167
 168         *seq_number = 0;
 169
 170         chunkNo = blockId * dev->param.chunks_per_block;
 171
 172         if (!ynandif_IsBlockOk(dev, blockId)) {
 173                 *state = YAFFS_BLOCK_STATE_DEAD;
 174         } else {
 175                 ynandif_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &tags);
 176
 177                 if (!tags.chunk_used) {
 178                         *state = YAFFS_BLOCK_STATE_EMPTY;
 179                 } else {
 180                         *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
 181                         *seq_number = tags.seq_number;
 182                 }
 183         }
 184
 185         return YAFFS_OK;
 186 }
 187
 188
 189 int ynandif_InitialiseNAND(struct yaffs_dev *dev)
 190 {
 191         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
 192
 193         geometry->initialise(dev);
 194
 195         return YAFFS_OK;
 196 }
 197
 198 int ynandif_Deinitialise_flash_fn(struct yaffs_dev *dev)
 199 {
 200         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
 201
 202         geometry->deinitialise(dev);
 203
 204         return YAFFS_OK;
 205 }
 206
 207
 208 struct yaffs_dev *
 209         yaffs_add_dev_from_geometry(const YCHAR *name,
 210                                         const struct ynandif_Geometry *geometry)
 211 {
 212         YCHAR *clonedName = malloc(sizeof(YCHAR) *
 213                                 (strnlen(name, YAFFS_MAX_NAME_LENGTH)+1));
 214         struct yaffs_dev *dev = malloc(sizeof(struct yaffs_dev));
 215         struct yaffs_param *param;
 216
 217         if (dev && clonedName) {
 218                 memset(dev, 0, sizeof(struct yaffs_dev));
 219                 strcpy(clonedName, name);
 220
 221                 param = &dev->param;
 222
 223                 param->name = clonedName;
 224                 param->write_chunk_tags_fn = ynandif_WriteChunkWithTagsToNAND;
 225                 param->read_chunk_tags_fn = ynandif_ReadChunkWithTagsFromNAND;
 226                 param->erase_fn = ynandif_EraseBlockInNAND;
 227                 param->initialise_flash_fn = ynandif_InitialiseNAND;
 228                 param->query_block_fn = ynandif_QueryNANDBlock;
 229                 param->bad_block_fn = ynandif_MarkNANDBlockBad;
 230                 param->n_caches = 20;
 231                 param->start_block = geometry->start_block;
 232                 param->end_block   = geometry->end_block;
 233                 param->total_bytes_per_chunk  = geometry->dataSize;
 234                 param->spare_bytes_per_chunk  = geometry->spareSize;
 235                 param->inband_tags                = geometry->inband_tags;
 236                 param->chunks_per_block   = geometry->pagesPerBlock;
 237                 param->use_nand_ecc               = geometry->hasECC;
 238                 param->is_yaffs2                  = geometry->useYaffs2;
 239                 param->n_reserved_blocks          = 5;
 240                 dev->driver_context               = (void *)geometry;
 241
 242                 yaffs_add_device(dev);
 243
 244                 return dev;
 245         }
 246
 247         free(dev);
 248         free(clonedName);
 249
 250         return NULL;
 251 }