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         int i;
  64         int fSize;
  65         int written;
  66
  67         yflash_Page p;
  68
  69         (void)dev;
  70
  71         if(initialised)
  72         {
  73                 return YAFFS_OK;
  74         }
  75
  76         initialised = 1;
  77
  78
  79         filedisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
  80
  81         filedisk.handle = open("emfile-512-0", O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
  82
  83         if(filedisk.handle < 0)
  84         {
  85                 perror("Failed to open yaffs emulation file");
  86                 return YAFFS_FAIL;
  87         }
  88
  89
  90         fSize = lseek(filedisk.handle,0,SEEK_END);
  91
  92         if(fSize < SIZE_IN_MB * 1024 * 1024)
  93         {
  94                 printf("Creating yaffs emulation file\n");
  95
  96                 lseek(filedisk.handle,0,SEEK_SET);
  97
  98                 memset(&p,0xff,sizeof(yflash_Page));
  99
 100                 for(i = 0; i < SIZE_IN_MB * 1024 * 1024; i+= 512)
 101                 {
 102                         written = write(filedisk.handle,&p,sizeof(yflash_Page));
 103
 104                         if(written != sizeof(yflash_Page))
 105                         {
 106                                 printf("Write failed\n");
 107                                 return YAFFS_FAIL;
 108                         }
 109                 }
 110         }
 111
 112         return 1;
 113 }
 114
 115 int yflash_WriteChunkToNAND(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const struct yaffs_spare *spare)
 116 {
 117         int written;
 118
 119         CheckInit(dev);
 120
 121         if(data)
 122         {
 123                 lseek(filedisk.handle,nand_chunk * 528,SEEK_SET);
 124                 written = write(filedisk.handle,data,512);
 125
 126                 if(written != 512) return YAFFS_FAIL;
 127         }
 128
 129         if(spare)
 130         {
 131                 lseek(filedisk.handle,nand_chunk * 528 + 512,SEEK_SET);
 132                 written = write(filedisk.handle,spare,16);
 133
 134                 if(written != 16) return YAFFS_FAIL;
 135         }
 136
 137
 138         return YAFFS_OK;
 139
 140 }
 141
 142
 143 int yflash_ReadChunkFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_spare *spare)
 144 {
 145         int nread;
 146
 147         CheckInit(dev);
 148
 149         if(data)
 150         {
 151                 lseek(filedisk.handle,nand_chunk * 528,SEEK_SET);
 152                 nread = read(filedisk.handle,data,512);
 153
 154                 if(nread != 512) return YAFFS_FAIL;
 155         }
 156
 157         if(spare)
 158         {
 159                 lseek(filedisk.handle,nand_chunk * 528 + 512,SEEK_SET);
 160                 nread= read(filedisk.handle,spare,16);
 161
 162                 if(nread != 16) return YAFFS_FAIL;
 163         }
 164
 165
 166         return YAFFS_OK;
 167
 168 }
 169
 170
 171 int yflash_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
 172 {
 173         int i;
 174
 175         CheckInit(dev);
 176
 177         if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
 178         {
 179                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 180                         "Attempt to erase non-existant block %d\n",
 181                         blockNumber);
 182                 return YAFFS_FAIL;
 183         }
 184         else
 185         {
 186
 187                 yflash_Page pg;
 188
 189                 memset(&pg,0xff,sizeof(yflash_Page));
 190
 191                 lseek(filedisk.handle, blockNumber * 32 * 528, SEEK_SET);
 192
 193                 for(i = 0; i < 32; i++)
 194                 {
 195                         write(filedisk.handle,&pg,528);
 196                 }
 197                 return YAFFS_OK;
 198         }
 199
 200 }
 201
 202 int yflash_InitialiseNAND(struct yaffs_dev *dev)
 203 {
 204         (void) dev;
 205
 206         return YAFFS_OK;
 207 }
 208
 209