direct/test-framework/yaffs_fileem.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2011 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  * This provides a YAFFS nand emulation on a file.
  16  * This is only intended as test code to test persistence etc.
  17  */
  18
  19 #include "yportenv.h"
  20 #include "yaffs_trace.h"
  21
  22 #include "yaffs_flashif.h"
  23 #include "yaffs_guts.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29
  30
  31
  32 #define SIZE_IN_MB 16
  33
  34 #define BLOCK_SIZE (32 * 528)
  35 #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
  36
  37
  38
  39 typedef struct
  40 {
  41         u8 data[528]; // Data + spare
  42 } yflash_Page;
  43
  44 typedef struct
  45 {
  46         yflash_Page page[32]; // The pages in the block
  47
  48 } yflash_Block;
  49
  50
  51
  52 typedef struct
  53 {
  54         int handle;
  55         int nBlocks;
  56 } yflash_Device;
  57
  58 static yflash_Device filedisk;
  59
  60 static int  CheckInit(struct yaffs_dev *dev)
  61 {
  62         static int initialised = 0;
  63
  64         int i;
  65
  66
  67         int fSize;
  68         int written;
  69
  70         yflash_Page p;
  71
  72         if(initialised)
  73         {
  74                 return YAFFS_OK;
  75         }
  76
  77         initialised = 1;
  78
  79
  80         filedisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
  81
  82         filedisk.handle = open("emfile-512-0", O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
  83
  84         if(filedisk.handle < 0)
  85         {
  86                 perror("Failed to open yaffs emulation file");
  87                 return YAFFS_FAIL;
  88         }
  89
  90
  91         fSize = lseek(filedisk.handle,0,SEEK_END);
  92
  93         if(fSize < SIZE_IN_MB * 1024 * 1024)
  94         {
  95                 printf("Creating yaffs emulation file\n");
  96
  97                 lseek(filedisk.handle,0,SEEK_SET);
  98
  99                 memset(&p,0xff,sizeof(yflash_Page));
 100
 101                 for(i = 0; i < SIZE_IN_MB * 1024 * 1024; i+= 512)
 102                 {
 103                         written = write(filedisk.handle,&p,sizeof(yflash_Page));
 104
 105                         if(written != sizeof(yflash_Page))
 106                         {
 107                                 printf("Write failed\n");
 108                                 return YAFFS_FAIL;
 109                         }
 110                 }
 111         }
 112
 113         return 1;
 114 }
 115
 116 int yflash_WriteChunkToNAND(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const struct yaffs_spare *spare)
 117 {
 118         int written;
 119
 120         CheckInit(dev);
 121
 122
 123
 124         if(data)
 125         {
 126                 lseek(filedisk.handle,nand_chunk * 528,SEEK_SET);
 127                 written = write(filedisk.handle,data,512);
 128
 129                 if(written != 512) return YAFFS_FAIL;
 130         }
 131
 132         if(spare)
 133         {
 134                 lseek(filedisk.handle,nand_chunk * 528 + 512,SEEK_SET);
 135                 written = write(filedisk.handle,spare,16);
 136
 137                 if(written != 16) return YAFFS_FAIL;
 138         }
 139
 140
 141         return YAFFS_OK;
 142
 143 }
 144
 145
 146 int yflash_ReadChunkFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_spare *spare)
 147 {
 148         int nread;
 149
 150         CheckInit(dev);
 151
 152
 153
 154         if(data)
 155         {
 156                 lseek(filedisk.handle,nand_chunk * 528,SEEK_SET);
 157                 nread = read(filedisk.handle,data,512);
 158
 159                 if(nread != 512) return YAFFS_FAIL;
 160         }
 161
 162         if(spare)
 163         {
 164                 lseek(filedisk.handle,nand_chunk * 528 + 512,SEEK_SET);
 165                 nread= read(filedisk.handle,spare,16);
 166
 167                 if(nread != 16) return YAFFS_FAIL;
 168         }
 169
 170
 171         return YAFFS_OK;
 172
 173 }
 174
 175
 176 int yflash_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
 177 {
 178
 179         int i;
 180
 181         CheckInit(dev);
 182
 183         if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
 184         {
 185                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 186                         "Attempt to erase non-existant block %d\n",
 187                         blockNumber);
 188                 return YAFFS_FAIL;
 189         }
 190         else
 191         {
 192
 193                 yflash_Page pg;
 194
 195                 memset(&pg,0xff,sizeof(yflash_Page));
 196
 197                 lseek(filedisk.handle, blockNumber * 32 * 528, SEEK_SET);
 198
 199                 for(i = 0; i < 32; i++)
 200                 {
 201                         write(filedisk.handle,&pg,528);
 202                 }
 203                 return YAFFS_OK;
 204         }
 205
 206 }
 207
 208 int yflash_InitialiseNAND(struct yaffs_dev *dev)
 209 {
 210
 211         return YAFFS_OK;
 212 }
 213
 214