git.sur5r.net Git - u-boot/blob - fs/yaffs2/direct/yaffs_flashif.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 /* XXX U-BOOT XXX */
  15 #include <common.h>
  16
  17 const char *yaffs_flashif_c_version = "$Id: yaffs_flashif.c,v 1.3 2007/02/14 01:09:06 wookey Exp $";
  18
  19
  20 #include "yportenv.h"
  21
  22 #include "yaffs_flashif.h"
  23 #include "yaffs_guts.h"
  24 #include "devextras.h"
  25
  26
  27 #define SIZE_IN_MB 16
  28
  29 #define BLOCK_SIZE (32 * 528)
  30 #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
  31
  32
  33
  34 typedef struct
  35 {
  36         __u8 data[528]; // Data + spare
  37 } yflash_Page;
  38
  39 typedef struct
  40 {
  41         yflash_Page page[32]; // The pages in the block
  42
  43 } yflash_Block;
  44
  45
  46
  47 typedef struct
  48 {
  49         yflash_Block **block;
  50         int nBlocks;
  51 } yflash_Device;
  52
  53 static yflash_Device ramdisk;
  54
  55 static int  CheckInit(yaffs_Device *dev)
  56 {
  57         static int initialised = 0;
  58
  59         int i;
  60         int fail = 0;
  61         int nAllocated = 0;
  62
  63         if(initialised)
  64         {
  65                 return YAFFS_OK;
  66         }
  67
  68         initialised = 1;
  69
  70
  71         ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
  72
  73         ramdisk.block = YMALLOC(sizeof(yflash_Block *) * ramdisk.nBlocks);
  74
  75         if(!ramdisk.block) return 0;
  76
  77         for(i=0; i <ramdisk.nBlocks; i++)
  78         {
  79                 ramdisk.block[i] = NULL;
  80         }
  81
  82         for(i=0; i <ramdisk.nBlocks && !fail; i++)
  83         {
  84                 if((ramdisk.block[i] = YMALLOC(sizeof(yflash_Block))) == 0)
  85                 {
  86                         fail = 1;
  87                 }
  88                 else
  89                 {
  90                         yflash_EraseBlockInNAND(dev,i);
  91                         nAllocated++;
  92                 }
  93         }
  94
  95         if(fail)
  96         {
  97                 for(i = 0; i < nAllocated; i++)
  98                 {
  99                         YFREE(ramdisk.block[i]);
 100                 }
 101                 YFREE(ramdisk.block);
 102
 103                 T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
 104                    nAllocated/64,ramdisk.nBlocks * YAFFS_BYTES_PER_BLOCK));
 105                 return 0;
 106         }
 107
 108
 109
 110         return 1;
 111 }
 112
 113 int yflash_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
 114 {
 115         int blk;
 116         int pg;
 117
 118
 119         CheckInit(dev);
 120
 121         blk = chunkInNAND/32;
 122         pg = chunkInNAND%32;
 123
 124
 125         if(data)
 126         {
 127                 memcpy(ramdisk.block[blk]->page[pg].data,data,512);
 128         }
 129
 130
 131         if(tags)
 132         {
 133                 yaffs_PackedTags pt;
 134                 yaffs_PackTags(&pt,tags);
 135                 memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
 136         }
 137
 138         return YAFFS_OK;
 139
 140 }
 141
 142
 143 int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Tags *tags)
 144 {
 145         int blk;
 146         int pg;
 147
 148
 149         CheckInit(dev);
 150
 151         blk = chunkInNAND/32;
 152         pg = chunkInNAND%32;
 153
 154
 155         if(data)
 156         {
 157                 memcpy(data,ramdisk.block[blk]->page[pg].data,512);
 158         }
 159
 160
 161         if(tags)
 162         {
 163                 yaffs_PackedTags pt;
 164                 memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(yaffs_PackedTags));
 165                 yaffs_UnpackTags(tags,&pt);
 166         }
 167
 168         return YAFFS_OK;
 169 }
 170
 171
 172 int yflash_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
 173 {
 174         int blk;
 175         int pg;
 176         int i;
 177
 178
 179         CheckInit(dev);
 180
 181         blk = chunkInNAND/32;
 182         pg = chunkInNAND%32;
 183
 184
 185         for(i = 0; i < 528; i++)
 186         {
 187                 if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
 188                 {
 189                         return YAFFS_FAIL;
 190                 }
 191         }
 192
 193         return YAFFS_OK;
 194
 195 }
 196
 197 int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
 198 {
 199
 200         CheckInit(dev);
 201
 202         if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
 203         {
 204                 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
 205                 return YAFFS_FAIL;
 206         }
 207         else
 208         {
 209                 memset(ramdisk.block[blockNumber],0xFF,sizeof(yflash_Block));
 210                 return YAFFS_OK;
 211         }
 212
 213 }
 214
 215 int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 216 {
 217         return YAFFS_OK;
 218
 219 }
 220 int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
 221 {
 222         *state = YAFFS_BLOCK_STATE_EMPTY;
 223         *sequenceNumber = 0;
 224 }
 225
 226
 227 int yflash_InitialiseNAND(yaffs_Device *dev)
 228 {
 229         return YAFFS_OK;
 230 }