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                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 179                         "Allocation failed, could only allocate %dMB of %dMB requested.\n",
 180                         nAllocated/64,sizeInMB);
 181                 return 0;
 182         }
 183
 184         ned.nBlocks = nBlocks;
 185
 186         initialised = 1;
 187
 188         return 1;
 189 }
 190
 191 int nandemul2k_WriteChunkWithTagsToNAND(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const struct yaffs_ext_tags *tags)
 192 {
 193         int blk;
 194         int pg;
 195         int i;
 196
 197         u8 *x;
 198
 199
 200         blk = nand_chunk/PAGES_PER_BLOCK;
 201         pg = nand_chunk%PAGES_PER_BLOCK;
 202
 203
 204         if(data)
 205         {
 206                 x = ned.block[blk]->page[pg]->data;
 207
 208                 for(i = 0; i < PAGE_DATA_SIZE; i++)
 209                 {
 210                         x[i] &=data[i];
 211                 }
 212
 213                 ned.block[blk]->page[pg]->empty = 0;
 214         }
 215
 216
 217         if(tags)
 218         {
 219                 x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE];
 220
 221                 yaffs_pack_tags2(dev, (struct yaffs_packed_tags2 *)x,tags, !dev->param.no_tags_ecc);
 222
 223         }
 224
 225         if(tags || data)
 226         {
 227                 nandemul_yield(1);
 228         }
 229
 230         return YAFFS_OK;
 231 }
 232
 233
 234 int nandemul2k_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_ext_tags *tags)
 235 {
 236         int blk;
 237         int pg;
 238
 239         u8 *x;
 240
 241
 242
 243         blk = nand_chunk/PAGES_PER_BLOCK;
 244         pg = nand_chunk%PAGES_PER_BLOCK;
 245
 246
 247         if(data)
 248         {
 249                 memcpy(data,ned.block[blk]->page[pg]->data,PAGE_DATA_SIZE);
 250         }
 251
 252
 253         if(tags)
 254         {
 255                 x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE];
 256
 257                 yaffs_unpack_tags2(dev, tags,(struct yaffs_packed_tags2 *)x, !dev->param.no_tags_ecc);
 258         }
 259
 260         return YAFFS_OK;
 261 }
 262
 263 int nandemul2k_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
 264 {
 265         (void) dev;
 266
 267         if(blockNumber < 0 || blockNumber >= ned.nBlocks)
 268         {
 269                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 270                         "Attempt to erase non-existant block %d\n",
 271                         blockNumber);
 272         }
 273         else if(ned.block[blockNumber]->damaged)
 274         {
 275                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 276                         "Attempt to erase damaged block %d\n",
 277                         blockNumber);
 278         }
 279         else
 280         {
 281                 nandemul_ReallyEraseBlock(blockNumber);
 282         }
 283
 284         return YAFFS_OK;
 285 }
 286
 287 int nandemul2k_InitialiseNAND(struct yaffs_dev *dev)
 288 {
 289         (void) dev;
 290
 291         CheckInit();
 292         return YAFFS_OK;
 293 }
 294
 295 int nandemul2k_MarkNANDBlockBad(struct yaffs_dev *dev, int block_no)
 296 {
 297
 298         u8 *x;
 299
 300         (void) dev;
 301
 302         x = &ned.block[block_no]->page[0]->data[PAGE_DATA_SIZE];
 303
 304         memset(x,0,sizeof(struct yaffs_packed_tags2));
 305
 306
 307         return YAFFS_OK;
 308
 309 }
 310
 311 int nandemul2k_QueryNANDBlock(struct yaffs_dev *dev, int block_no, enum yaffs_block_state *state, u32  *seq_number)
 312 {
 313         struct yaffs_ext_tags tags;
 314         int chunkNo;
 315
 316         *seq_number = 0;
 317
 318         chunkNo = block_no * dev->param.chunks_per_block;
 319
 320         nandemul2k_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags);
 321         if(tags.block_bad)
 322         {
 323                 *state = YAFFS_BLOCK_STATE_DEAD;
 324         }
 325         else if(!tags.chunk_used)
 326         {
 327                 *state = YAFFS_BLOCK_STATE_EMPTY;
 328         }
 329         else if(tags.chunk_used)
 330         {
 331                 *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
 332                 *seq_number = tags.seq_number;
 333         }
 334         return YAFFS_OK;
 335 }
 336
 337 int nandemul2k_GetBytesPerChunk(void) { return PAGE_DATA_SIZE;}
 338
 339 int nandemul2k_GetChunksPerBlock(void) { return PAGES_PER_BLOCK; }
 340 int nandemul2k_GetNumberOfBlocks(void) {return nandemul2k_CalcNBlocks();}
 341
 342
 343 #endif //YAFFS_RAM_ENABLED
 344