direct/test-framework/yaffs_ramem2k.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2018 Aleph One Ltd.
   5  *
   6  * Created by Charles Manning <charles@aleph1.co.uk>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 /*
  14  * yaffs_ramem2k.c: RAM emulation in-kernel for 2K pages (YAFFS2)
  15  */
  16
  17
  18 #ifndef __KERNEL__
  19 #define CONFIG_YAFFS_RAM_ENABLED
  20 #else
  21 #include <linux/config.h>
  22 #endif
  23
  24 #ifdef CONFIG_YAFFS_RAM_ENABLED
  25
  26 #include "yportenv.h"
  27 #include "yaffs_trace.h"
  28
  29 #include "yaffs_nandemul2k.h"
  30 #include "yaffs_guts.h"
  31 #include "yaffs_packedtags2.h"
  32
  33
  34
  35 #define EM_SIZE_IN_MEG (32)
  36 #define PAGE_DATA_SIZE  (2048)
  37 #define PAGE_SPARE_SIZE (64)
  38 #define PAGES_PER_BLOCK (64)
  39
  40
  41
  42 #define EM_SIZE_IN_BYTES (EM_SIZE_IN_MEG * (1<<20))
  43
  44 #define PAGE_TOTAL_SIZE (PAGE_DATA_SIZE+PAGE_SPARE_SIZE)
  45
  46 #define BLOCK_TOTAL_SIZE (PAGES_PER_BLOCK * PAGE_TOTAL_SIZE)
  47
  48 #define BLOCKS_PER_MEG ((1<<20)/(PAGES_PER_BLOCK * PAGE_DATA_SIZE))
  49
  50
  51 typedef struct
  52 {
  53         u8 data[PAGE_TOTAL_SIZE]; // Data + spare
  54         int empty;      // is this empty?
  55 } nandemul_Page;
  56
  57
  58 typedef struct
  59 {
  60         nandemul_Page *page[PAGES_PER_BLOCK];
  61         int damaged;
  62 } nandemul_Block;
  63
  64
  65
  66 typedef struct
  67 {
  68         nandemul_Block**block;
  69         int nBlocks;
  70 } nandemul_Device;
  71
  72 static nandemul_Device ned;
  73
  74 static int sizeInMB = EM_SIZE_IN_MEG;
  75
  76
  77 static void nandemul_yield(int n)
  78 {
  79         (void)n;
  80 #ifdef __KERNEL__
  81         if(n > 0) schedule_timeout(n);
  82 #endif
  83
  84 }
  85
  86
  87 static void nandemul_ReallyEraseBlock(int blockNumber)
  88 {
  89         int i;
  90
  91         nandemul_Block *blk;
  92
  93         if(blockNumber < 0 || blockNumber >= ned.nBlocks)
  94         {
  95                 return;
  96         }
  97
  98         blk = ned.block[blockNumber];
  99
 100         for(i = 0; i < PAGES_PER_BLOCK; i++)
 101         {
 102                 memset(blk->page[i],0xff,sizeof(nandemul_Page));
 103                 blk->page[i]->empty = 1;
 104         }
 105         nandemul_yield(2);
 106 }
 107
 108
 109 static int nandemul2k_CalcNBlocks(void)
 110 {
 111         return EM_SIZE_IN_MEG * BLOCKS_PER_MEG;
 112 }
 113
 114
 115
 116 static int  CheckInit(void)
 117 {
 118         static int initialised = 0;
 119
 120         int i,j;
 121
 122         int fail = 0;
 123         int nBlocks;
 124
 125         int nAllocated = 0;
 126
 127         if(initialised)
 128         {
 129                 return YAFFS_OK;
 130         }
 131
 132
 133         ned.nBlocks = nBlocks = nandemul2k_CalcNBlocks();
 134
 135
 136         ned.block = malloc(sizeof(nandemul_Block*) * nBlocks );
 137
 138         if(!ned.block) return YAFFS_FAIL;
 139
 140
 141
 142
 143
 144         for(i=fail=0; i <nBlocks; i++)
 145         {
 146
 147                 nandemul_Block *blk;
 148
 149                 if(!(blk = ned.block[i] = malloc(sizeof(nandemul_Block))))
 150                 {
 151                  fail = 1;
 152                 }
 153                 else
 154                 {
 155                         for(j = 0; j < PAGES_PER_BLOCK; j++)
 156                         {
 157                                 if((blk->page[j] = malloc(sizeof(nandemul_Page))) == 0)
 158                                 {
 159                                         fail = 1;
 160                                 }
 161                         }
 162                         nandemul_ReallyEraseBlock(i);
 163                         ned.block[i]->damaged = 0;
 164                         nAllocated++;
 165                 }
 166         }
 167
 168         if(fail)
 169         {
 170                 //Todo thump pages
 171
 172                 for(i = 0; i < nAllocated; i++)
 173                 {
 174                         kfree(ned.block[i]);
 175                 }
 176                 kfree(ned.block);
 177
 178                 (void) sizeInMB;
 179
 180                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 181                         "Allocation failed, could only allocate %dMB of %dMB requested.\n",
 182                         nAllocated/64, sizeInMB);
 183                 return 0;
 184         }
 185
 186         ned.nBlocks = nBlocks;
 187
 188         initialised = 1;
 189
 190         return 1;
 191 }
 192
 193 int nandemul2k_WriteChunkWithTagsToNAND(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const struct yaffs_ext_tags *tags)
 194 {
 195         int blk;
 196         int pg;
 197         int i;
 198
 199         u8 *x;
 200
 201
 202         blk = nand_chunk/PAGES_PER_BLOCK;
 203         pg = nand_chunk%PAGES_PER_BLOCK;
 204
 205
 206         if(data)
 207         {
 208                 x = ned.block[blk]->page[pg]->data;
 209
 210                 for(i = 0; i < PAGE_DATA_SIZE; i++)
 211                 {
 212                         x[i] &=data[i];
 213                 }
 214
 215                 ned.block[blk]->page[pg]->empty = 0;
 216         }
 217
 218
 219         if(tags)
 220         {
 221                 x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE];
 222
 223                 yaffs_pack_tags2(dev, (struct yaffs_packed_tags2 *)x,tags, !dev->param.no_tags_ecc);
 224
 225         }
 226
 227         if(tags || data)
 228         {
 229                 nandemul_yield(1);
 230         }
 231
 232         return YAFFS_OK;
 233 }
 234
 235
 236 int nandemul2k_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_ext_tags *tags)
 237 {
 238         int blk;
 239         int pg;
 240
 241         u8 *x;
 242
 243
 244
 245         blk = nand_chunk/PAGES_PER_BLOCK;
 246         pg = nand_chunk%PAGES_PER_BLOCK;
 247
 248
 249         if(data)
 250         {
 251                 memcpy(data,ned.block[blk]->page[pg]->data,PAGE_DATA_SIZE);
 252         }
 253
 254
 255         if(tags)
 256         {
 257                 x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE];
 258
 259                 yaffs_unpack_tags2(dev, tags,(struct yaffs_packed_tags2 *)x, !dev->param.no_tags_ecc);
 260         }
 261
 262         return YAFFS_OK;
 263 }
 264
 265 int nandemul2k_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
 266 {
 267         (void) dev;
 268
 269         if(blockNumber < 0 || blockNumber >= ned.nBlocks)
 270         {
 271                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 272                         "Attempt to erase non-existant block %d\n",
 273                         blockNumber);
 274         }
 275         else if(ned.block[blockNumber]->damaged)
 276         {
 277                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 278                         "Attempt to erase damaged block %d\n",
 279                         blockNumber);
 280         }
 281         else
 282         {
 283                 nandemul_ReallyEraseBlock(blockNumber);
 284         }
 285
 286         return YAFFS_OK;
 287 }
 288
 289 int nandemul2k_InitialiseNAND(struct yaffs_dev *dev)
 290 {
 291         (void) dev;
 292
 293         CheckInit();
 294         return YAFFS_OK;
 295 }
 296
 297 int nandemul2k_MarkNANDBlockBad(struct yaffs_dev *dev, int block_no)
 298 {
 299
 300         u8 *x;
 301
 302         (void) dev;
 303
 304         x = &ned.block[block_no]->page[0]->data[PAGE_DATA_SIZE];
 305
 306         memset(x,0,sizeof(struct yaffs_packed_tags2));
 307
 308
 309         return YAFFS_OK;
 310
 311 }
 312
 313 int nandemul2k_QueryNANDBlock(struct yaffs_dev *dev, int block_no, enum yaffs_block_state *state, u32  *seq_number)
 314 {
 315         struct yaffs_ext_tags tags;
 316         int chunkNo;
 317
 318         *seq_number = 0;
 319
 320         chunkNo = block_no * dev->param.chunks_per_block;
 321
 322         nandemul2k_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags);
 323         if(tags.block_bad)
 324         {
 325                 *state = YAFFS_BLOCK_STATE_DEAD;
 326         }
 327         else if(!tags.chunk_used)
 328         {
 329                 *state = YAFFS_BLOCK_STATE_EMPTY;
 330         }
 331         else if(tags.chunk_used)
 332         {
 333                 *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
 334                 *seq_number = tags.seq_number;
 335         }
 336         return YAFFS_OK;
 337 }
 338
 339 int nandemul2k_GetBytesPerChunk(void) { return PAGE_DATA_SIZE;}
 340
 341 int nandemul2k_GetChunksPerBlock(void) { return PAGES_PER_BLOCK; }
 342 int nandemul2k_GetNumberOfBlocks(void) {return nandemul2k_CalcNBlocks();}
 343
 344
 345 #endif //YAFFS_RAM_ENABLED
 346