direct/yaffs_flashif.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2010 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
  15 const char *yaffs_flashif_c_version = "$Id: yaffs_flashif.c,v 1.3 2007-02-14 01:09:06 wookey Exp $";
  16
  17
  18 #include "yportenv.h"
  19
  20 #include "yaffs_flashif.h"
  21 #include "yaffs_guts.h"
  22 #include "devextras.h"
  23
  24
  25 #define SIZE_IN_MB 16
  26
  27 #define BLOCK_SIZE (32 * 528)
  28 #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
  29
  30
  31
  32 typedef struct
  33 {
  34         __u8 data[528]; // Data + spare
  35 } yflash_Page;
  36
  37 typedef struct
  38 {
  39         yflash_Page page[32]; // The pages in the block
  40
  41 } yflash_Block;
  42
  43
  44
  45 typedef struct
  46 {
  47         yflash_Block **block;
  48         int nBlocks;
  49 } yflash_Device;
  50
  51 static yflash_Device ramdisk;
  52
  53 static int  CheckInit(yaffs_Device *dev)
  54 {
  55         static int initialised = 0;
  56
  57         int i;
  58         int fail = 0;
  59         int nAllocated = 0;
  60
  61         if(initialised)
  62         {
  63                 return YAFFS_OK;
  64         }
  65
  66         initialised = 1;
  67
  68
  69         ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
  70
  71         ramdisk.block = YMALLOC(sizeof(yflash_Block *) * ramdisk.nBlocks);
  72
  73         if(!ramdisk.block) return 0;
  74
  75         for(i=0; i <ramdisk.nBlocks; i++)
  76         {
  77                 ramdisk.block[i] = NULL;
  78         }
  79
  80         for(i=0; i <ramdisk.nBlocks && !fail; i++)
  81         {
  82                 if((ramdisk.block[i] = YMALLOC(sizeof(yflash_Block))) == 0)
  83                 {
  84                         fail = 1;
  85                 }
  86                 else
  87                 {
  88                         yflash_EraseBlockInNAND(dev,i);
  89                         nAllocated++;
  90                 }
  91         }
  92
  93         if(fail)
  94         {
  95                 for(i = 0; i < nAllocated; i++)
  96                 {
  97                         YFREE(ramdisk.block[i]);
  98                 }
  99                 YFREE(ramdisk.block);
 100
 101                 T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
 102                    nAllocated/64,ramdisk.nBlocks * YAFFS_BYTES_PER_BLOCK));
 103                 return 0;
 104         }
 105
 106
 107
 108         return 1;
 109 }
 110
 111 int yflash_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
 112 {
 113         int blk;
 114         int pg;
 115
 116
 117         CheckInit(dev);
 118
 119         blk = chunkInNAND/32;
 120         pg = chunkInNAND%32;
 121
 122
 123         if(data)
 124         {
 125                 memcpy(ramdisk.block[blk]->page[pg].data,data,512);
 126         }
 127
 128
 129         if(tags)
 130         {
 131                 yaffs_PackedTags pt;
 132                 yaffs_PackTags(&pt,tags);
 133                 memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
 134         }
 135
 136         return YAFFS_OK;
 137
 138 }
 139
 140
 141 int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Tags *tags)
 142 {
 143         int blk;
 144         int pg;
 145
 146
 147         CheckInit(dev);
 148
 149         blk = chunkInNAND/32;
 150         pg = chunkInNAND%32;
 151
 152
 153         if(data)
 154         {
 155                 memcpy(data,ramdisk.block[blk]->page[pg].data,512);
 156         }
 157
 158
 159         if(tags)
 160         {
 161                 yaffs_PackedTags pt;
 162                 memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(yaffs_PackedTags));
 163                 yaffs_UnpackTags(tags,&pt);
 164         }
 165
 166         return YAFFS_OK;
 167 }
 168
 169
 170 int yflash_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
 171 {
 172         int blk;
 173         int pg;
 174         int i;
 175
 176
 177         CheckInit(dev);
 178
 179         blk = chunkInNAND/32;
 180         pg = chunkInNAND%32;
 181
 182
 183         for(i = 0; i < 528; i++)
 184         {
 185                 if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
 186                 {
 187                         return YAFFS_FAIL;
 188                 }
 189         }
 190
 191         return YAFFS_OK;
 192
 193 }
 194
 195 int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
 196 {
 197
 198         CheckInit(dev);
 199
 200         if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
 201         {
 202                 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
 203                 return YAFFS_FAIL;
 204         }
 205         else
 206         {
 207                 memset(ramdisk.block[blockNumber],0xFF,sizeof(yflash_Block));
 208                 return YAFFS_OK;
 209         }
 210
 211 }
 212
 213 int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 214 {
 215         return YAFFS_OK;
 216
 217 }
 218 int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
 219 {
 220         *state = YAFFS_BLOCK_STATE_EMPTY;
 221         *sequenceNumber = 0;
 222 }
 223
 224
 225 int yflash_InitialiseNAND(yaffs_Device *dev)
 226 {
 227         return YAFFS_OK;
 228 }
 229