direct/basic-test/yaffs_fileem.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2010 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 const char *yaffs_flashif_c_version = "$Id: yaffs_fileem.c,v 1.7 2010-02-18 01:18:04 charles Exp $";
  20
  21
  22 #include "yportenv.h"
  23 #include "yaffs_trace.h"
  24
  25 #include "yaffs_flashif.h"
  26 #include "yaffs_guts.h"
  27
  28 #include "devextras.h"
  29
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33 #include <unistd.h>
  34
  35
  36
  37 #define SIZE_IN_MB 16
  38
  39 #define BLOCK_SIZE (32 * 528)
  40 #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
  41
  42
  43
  44 typedef struct
  45 {
  46         u8 data[528]; // Data + spare
  47 } yflash_Page;
  48
  49 typedef struct
  50 {
  51         yflash_Page page[32]; // The pages in the block
  52
  53 } yflash_Block;
  54
  55
  56
  57 typedef struct
  58 {
  59         int handle;
  60         int nBlocks;
  61 } yflash_Device;
  62
  63 static yflash_Device filedisk;
  64
  65 static int  CheckInit(struct yaffs_dev *dev)
  66 {
  67         static int initialised = 0;
  68
  69         int i;
  70
  71
  72         int fSize;
  73         int written;
  74
  75         yflash_Page p;
  76
  77         if(initialised)
  78         {
  79                 return YAFFS_OK;
  80         }
  81
  82         initialised = 1;
  83
  84
  85         filedisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
  86
  87         filedisk.handle = open("emfile-512-0", O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
  88
  89         if(filedisk.handle < 0)
  90         {
  91                 perror("Failed to open yaffs emulation file");
  92                 return YAFFS_FAIL;
  93         }
  94
  95
  96         fSize = lseek(filedisk.handle,0,SEEK_END);
  97
  98         if(fSize < SIZE_IN_MB * 1024 * 1024)
  99         {
 100                 printf("Creating yaffs emulation file\n");
 101
 102                 lseek(filedisk.handle,0,SEEK_SET);
 103
 104                 memset(&p,0xff,sizeof(yflash_Page));
 105
 106                 for(i = 0; i < SIZE_IN_MB * 1024 * 1024; i+= 512)
 107                 {
 108                         written = write(filedisk.handle,&p,sizeof(yflash_Page));
 109
 110                         if(written != sizeof(yflash_Page))
 111                         {
 112                                 printf("Write failed\n");
 113                                 return YAFFS_FAIL;
 114                         }
 115                 }
 116         }
 117
 118         return 1;
 119 }
 120
 121 int yflash_WriteChunkToNAND(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const yaffs_spare *spare)
 122 {
 123         int written;
 124
 125         CheckInit(dev);
 126
 127
 128
 129         if(data)
 130         {
 131                 lseek(filedisk.handle,nand_chunk * 528,SEEK_SET);
 132                 written = write(filedisk.handle,data,512);
 133
 134                 if(written != 512) return YAFFS_FAIL;
 135         }
 136
 137         if(spare)
 138         {
 139                 lseek(filedisk.handle,nand_chunk * 528 + 512,SEEK_SET);
 140                 written = write(filedisk.handle,spare,16);
 141
 142                 if(written != 16) return YAFFS_FAIL;
 143         }
 144
 145
 146         return YAFFS_OK;
 147
 148 }
 149
 150
 151 int yflash_ReadChunkFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, yaffs_spare *spare)
 152 {
 153         int nread;
 154
 155         CheckInit(dev);
 156
 157
 158
 159         if(data)
 160         {
 161                 lseek(filedisk.handle,nand_chunk * 528,SEEK_SET);
 162                 nread = read(filedisk.handle,data,512);
 163
 164                 if(nread != 512) return YAFFS_FAIL;
 165         }
 166
 167         if(spare)
 168         {
 169                 lseek(filedisk.handle,nand_chunk * 528 + 512,SEEK_SET);
 170                 nread= read(filedisk.handle,spare,16);
 171
 172                 if(nread != 16) return YAFFS_FAIL;
 173         }
 174
 175
 176         return YAFFS_OK;
 177
 178 }
 179
 180
 181 int yflash_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
 182 {
 183
 184         int i;
 185
 186         CheckInit(dev);
 187
 188         if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
 189         {
 190                 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
 191                 return YAFFS_FAIL;
 192         }
 193         else
 194         {
 195
 196                 yflash_Page pg;
 197
 198                 memset(&pg,0xff,sizeof(yflash_Page));
 199
 200                 lseek(filedisk.handle, blockNumber * 32 * 528, SEEK_SET);
 201
 202                 for(i = 0; i < 32; i++)
 203                 {
 204                         write(filedisk.handle,&pg,528);
 205                 }
 206                 return YAFFS_OK;
 207         }
 208
 209 }
 210
 211 int yflash_InitialiseNAND(struct yaffs_dev *dev)
 212 {
 213
 214         return YAFFS_OK;
 215 }
 216
 217