git.sur5r.net Git - u-boot/blob - fs/yaffs2/direct/yaffs_ramem2k.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 /*
  15  * yaffs_ramem2k.c: RAM emulation in-kernel for 2K pages (YAFFS2)
  16  */
  17
  18 /* XXX U-BOOT XXX */
  19 #include <common.h>
  20
  21 const char *yaffs_ramem2k_c_version = "$Id: yaffs_ramem2k.c,v 1.3 2007/02/14 01:09:06 wookey Exp $";
  22
  23 #ifndef __KERNEL__
  24 #define CONFIG_YAFFS_RAM_ENABLED
  25 #else
  26 #include <linux/config.h>
  27 #endif
  28
  29 #ifdef CONFIG_YAFFS_RAM_ENABLED
  30
  31 #include "yportenv.h"
  32
  33 #include "yaffs_nandemul2k.h"
  34 #include "yaffs_guts.h"
  35 #include "yaffsinterface.h"
  36 #include "devextras.h"
  37 #include "yaffs_packedtags2.h"
  38
  39
  40
  41 #define EM_SIZE_IN_MEG (32)
  42 #define PAGE_DATA_SIZE  (2048)
  43 #define PAGE_SPARE_SIZE (64)
  44 #define PAGES_PER_BLOCK (64)
  45
  46
  47
  48 #define EM_SIZE_IN_BYTES (EM_SIZE_IN_MEG * (1<<20))
  49
  50 #define PAGE_TOTAL_SIZE (PAGE_DATA_SIZE+PAGE_SPARE_SIZE)
  51
  52 #define BLOCK_TOTAL_SIZE (PAGES_PER_BLOCK * PAGE_TOTAL_SIZE)
  53
  54 #define BLOCKS_PER_MEG ((1<<20)/(PAGES_PER_BLOCK * PAGE_DATA_SIZE))
  55
  56
  57 typedef struct
  58 {
  59         __u8 data[PAGE_TOTAL_SIZE]; // Data + spare
  60         int empty;      // is this empty?
  61 } nandemul_Page;
  62
  63
  64 typedef struct
  65 {
  66         nandemul_Page *page[PAGES_PER_BLOCK];
  67         int damaged;
  68 } nandemul_Block;
  69
  70
  71
  72 typedef struct
  73 {
  74         nandemul_Block**block;
  75         int nBlocks;
  76 } nandemul_Device;
  77
  78 static nandemul_Device ned;
  79
  80 static int sizeInMB = EM_SIZE_IN_MEG;
  81
  82
  83 static void nandemul_yield(int n)
  84 {
  85 #ifdef __KERNEL__
  86         if(n > 0) schedule_timeout(n);
  87 #endif
  88
  89 }
  90
  91
  92 static void nandemul_ReallyEraseBlock(int blockNumber)
  93 {
  94         int i;
  95
  96         nandemul_Block *blk;
  97
  98         if(blockNumber < 0 || blockNumber >= ned.nBlocks)
  99         {
 100                 return;
 101         }
 102
 103         blk = ned.block[blockNumber];
 104
 105         for(i = 0; i < PAGES_PER_BLOCK; i++)
 106         {
 107                 memset(blk->page[i],0xff,sizeof(nandemul_Page));
 108                 blk->page[i]->empty = 1;
 109         }
 110         nandemul_yield(2);
 111 }
 112
 113
 114 static int nandemul2k_CalcNBlocks(void)
 115 {
 116         return EM_SIZE_IN_MEG * BLOCKS_PER_MEG;
 117 }
 118
 119
 120
 121 static int  CheckInit(void)
 122 {
 123         static int initialised = 0;
 124
 125         int i,j;
 126
 127         int fail = 0;
 128         int nBlocks;
 129
 130         int nAllocated = 0;
 131
 132         if(initialised)
 133         {
 134                 return YAFFS_OK;
 135         }
 136
 137
 138         ned.nBlocks = nBlocks = nandemul2k_CalcNBlocks();
 139
 140
 141         ned.block = YMALLOC(sizeof(nandemul_Block*) * nBlocks );
 142
 143         if(!ned.block) return YAFFS_FAIL;
 144
 145
 146
 147
 148
 149         for(i=fail=0; i <nBlocks; i++)
 150         {
 151
 152                 nandemul_Block *blk;
 153
 154                 if(!(blk = ned.block[i] = YMALLOC(sizeof(nandemul_Block))))
 155                 {
 156                  fail = 1;
 157                 }
 158                 else
 159                 {
 160                         for(j = 0; j < PAGES_PER_BLOCK; j++)
 161                         {
 162                                 if((blk->page[j] = YMALLOC(sizeof(nandemul_Page))) == 0)
 163                                 {
 164                                         fail = 1;
 165                                 }
 166                         }
 167                         nandemul_ReallyEraseBlock(i);
 168                         ned.block[i]->damaged = 0;
 169                         nAllocated++;
 170                 }
 171         }
 172
 173         if(fail)
 174         {
 175                 //Todo thump pages
 176
 177                 for(i = 0; i < nAllocated; i++)
 178                 {
 179                         YFREE(ned.block[i]);
 180                 }
 181                 YFREE(ned.block);
 182
 183                 T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
 184                    nAllocated/64,sizeInMB));
 185                 return 0;
 186         }
 187
 188         ned.nBlocks = nBlocks;
 189
 190         initialised = 1;
 191
 192         return 1;
 193 }
 194
 195 int nandemul2k_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
 196 {
 197         int blk;
 198         int pg;
 199         int i;
 200
 201         __u8 *x;
 202
 203
 204         blk = chunkInNAND/PAGES_PER_BLOCK;
 205         pg = chunkInNAND%PAGES_PER_BLOCK;
 206
 207
 208         if(data)
 209         {
 210                 x = ned.block[blk]->page[pg]->data;
 211
 212                 for(i = 0; i < PAGE_DATA_SIZE; i++)
 213                 {
 214                         x[i] &=data[i];
 215                 }
 216
 217                 ned.block[blk]->page[pg]->empty = 0;
 218         }
 219
 220
 221         if(tags)
 222         {
 223                 x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE];
 224
 225                 yaffs_PackTags2((yaffs_PackedTags2 *)x,tags);
 226
 227         }
 228
 229         if(tags || data)
 230         {
 231                 nandemul_yield(1);
 232         }
 233
 234         return YAFFS_OK;
 235 }
 236
 237
 238 int nandemul2k_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
 239 {
 240         int blk;
 241         int pg;
 242
 243         __u8 *x;
 244
 245
 246
 247         blk = chunkInNAND/PAGES_PER_BLOCK;
 248         pg = chunkInNAND%PAGES_PER_BLOCK;
 249
 250
 251         if(data)
 252         {
 253                 memcpy(data,ned.block[blk]->page[pg]->data,PAGE_DATA_SIZE);
 254         }
 255
 256
 257         if(tags)
 258         {
 259                 x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE];
 260
 261                 yaffs_UnpackTags2(tags,(yaffs_PackedTags2 *)x);
 262         }
 263
 264         return YAFFS_OK;
 265 }
 266
 267
 268 static int nandemul2k_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
 269 {
 270         int blk;
 271         int pg;
 272         int i;
 273
 274
 275
 276         blk = chunkInNAND/PAGES_PER_BLOCK;
 277         pg = chunkInNAND%PAGES_PER_BLOCK;
 278
 279
 280         for(i = 0; i < PAGE_TOTAL_SIZE; i++)
 281         {
 282                 if(ned.block[blk]->page[pg]->data[i] != 0xFF)
 283                 {
 284                         return YAFFS_FAIL;
 285                 }
 286         }
 287
 288         return YAFFS_OK;
 289
 290 }
 291
 292 int nandemul2k_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
 293 {
 294
 295
 296         if(blockNumber < 0 || blockNumber >= ned.nBlocks)
 297         {
 298                 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
 299         }
 300         else if(ned.block[blockNumber]->damaged)
 301         {
 302                 T(YAFFS_TRACE_ALWAYS,("Attempt to erase damaged block %d\n",blockNumber));
 303         }
 304         else
 305         {
 306                 nandemul_ReallyEraseBlock(blockNumber);
 307         }
 308
 309         return YAFFS_OK;
 310 }
 311
 312 int nandemul2k_InitialiseNAND(yaffs_Device *dev)
 313 {
 314         CheckInit();
 315         return YAFFS_OK;
 316 }
 317
 318 int nandemul2k_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 319 {
 320
 321         __u8 *x;
 322
 323         x = &ned.block[blockNo]->page[0]->data[PAGE_DATA_SIZE];
 324
 325         memset(x,0,sizeof(yaffs_PackedTags2));
 326
 327
 328         return YAFFS_OK;
 329
 330 }
 331
 332 int nandemul2k_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
 333 {
 334         yaffs_ExtendedTags tags;
 335         int chunkNo;
 336
 337         *sequenceNumber = 0;
 338
 339         chunkNo = blockNo * dev->nChunksPerBlock;
 340
 341         nandemul2k_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags);
 342         if(tags.blockBad)
 343         {
 344                 *state = YAFFS_BLOCK_STATE_DEAD;
 345         }
 346         else if(!tags.chunkUsed)
 347         {
 348                 *state = YAFFS_BLOCK_STATE_EMPTY;
 349         }
 350         else if(tags.chunkUsed)
 351         {
 352                 *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
 353                 *sequenceNumber = tags.sequenceNumber;
 354         }
 355         return YAFFS_OK;
 356 }
 357
 358 int nandemul2k_GetBytesPerChunk(void) { return PAGE_DATA_SIZE;}
 359
 360 int nandemul2k_GetChunksPerBlock(void) { return PAGES_PER_BLOCK; }
 361 int nandemul2k_GetNumberOfBlocks(void) {return nandemul2k_CalcNBlocks();}
 362
 363
 364 #endif //YAFFS_RAM_ENABLED