git.sur5r.net Git - u-boot/blob - fs/yaffs2/direct/yaffs_fileem.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 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 /* XXX U-BOOT XXX */
  20 #include <common.h>
  21
  22 const char *yaffs_flashif_c_version = "$Id: yaffs_fileem.c,v 1.3 2007/02/14 01:09:06 wookey Exp $";
  23
  24
  25 #include "yportenv.h"
  26
  27 #include "yaffs_flashif.h"
  28 #include "yaffs_guts.h"
  29
  30 #include "devextras.h"
  31
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36
  37
  38
  39 #define SIZE_IN_MB 16
  40
  41 #define BLOCK_SIZE (32 * 528)
  42 #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
  43
  44
  45
  46 typedef struct
  47 {
  48         __u8 data[528]; // Data + spare
  49 } yflash_Page;
  50
  51 typedef struct
  52 {
  53         yflash_Page page[32]; // The pages in the block
  54
  55 } yflash_Block;
  56
  57
  58
  59 typedef struct
  60 {
  61         int handle;
  62         int nBlocks;
  63 } yflash_Device;
  64
  65 static yflash_Device filedisk;
  66
  67 static int  CheckInit(yaffs_Device *dev)
  68 {
  69         static int initialised = 0;
  70
  71         int i;
  72
  73
  74         int fSize;
  75         int written;
  76
  77         yflash_Page p;
  78
  79         if(initialised)
  80         {
  81                 return YAFFS_OK;
  82         }
  83
  84         initialised = 1;
  85
  86
  87         filedisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
  88
  89         filedisk.handle = open("yaffsemfile", O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
  90
  91         if(filedisk.handle < 0)
  92         {
  93                 perror("Failed to open yaffs emulation file");
  94                 return YAFFS_FAIL;
  95         }
  96
  97
  98         fSize = lseek(filedisk.handle,0,SEEK_END);
  99
 100         if(fSize < SIZE_IN_MB * 1024 * 1024)
 101         {
 102                 printf("Creating yaffs emulation file\n");
 103
 104                 lseek(filedisk.handle,0,SEEK_SET);
 105
 106                 memset(&p,0xff,sizeof(yflash_Page));
 107
 108                 for(i = 0; i < SIZE_IN_MB * 1024 * 1024; i+= 512)
 109                 {
 110                         written = write(filedisk.handle,&p,sizeof(yflash_Page));
 111
 112                         if(written != sizeof(yflash_Page))
 113                         {
 114                                 printf("Write failed\n");
 115                                 return YAFFS_FAIL;
 116                         }
 117                 }
 118         }
 119
 120         return 1;
 121 }
 122
 123 int yflash_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)
 124 {
 125         int written;
 126
 127         CheckInit(dev);
 128
 129
 130
 131         if(data)
 132         {
 133                 lseek(filedisk.handle,chunkInNAND * 528,SEEK_SET);
 134                 written = write(filedisk.handle,data,512);
 135
 136                 if(written != 512) return YAFFS_FAIL;
 137         }
 138
 139         if(spare)
 140         {
 141                 lseek(filedisk.handle,chunkInNAND * 528 + 512,SEEK_SET);
 142                 written = write(filedisk.handle,spare,16);
 143
 144                 if(written != 16) return YAFFS_FAIL;
 145         }
 146
 147
 148         return YAFFS_OK;
 149
 150 }
 151
 152
 153 int yflash_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
 154 {
 155         int nread;
 156
 157         CheckInit(dev);
 158
 159
 160
 161         if(data)
 162         {
 163                 lseek(filedisk.handle,chunkInNAND * 528,SEEK_SET);
 164                 nread = read(filedisk.handle,data,512);
 165
 166                 if(nread != 512) return YAFFS_FAIL;
 167         }
 168
 169         if(spare)
 170         {
 171                 lseek(filedisk.handle,chunkInNAND * 528 + 512,SEEK_SET);
 172                 nread= read(filedisk.handle,spare,16);
 173
 174                 if(nread != 16) return YAFFS_FAIL;
 175         }
 176
 177
 178         return YAFFS_OK;
 179
 180 }
 181
 182
 183 int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
 184 {
 185
 186         int i;
 187
 188         CheckInit(dev);
 189
 190         if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
 191         {
 192                 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
 193                 return YAFFS_FAIL;
 194         }
 195         else
 196         {
 197
 198                 yflash_Page pg;
 199
 200                 memset(&pg,0xff,sizeof(yflash_Page));
 201
 202                 lseek(filedisk.handle, blockNumber * 32 * 528, SEEK_SET);
 203
 204                 for(i = 0; i < 32; i++)
 205                 {
 206                         write(filedisk.handle,&pg,528);
 207                 }
 208                 return YAFFS_OK;
 209         }
 210
 211 }
 212
 213 int yflash_InitialiseNAND(yaffs_Device *dev)
 214 {
 215         dev->useNANDECC = 1; // force on useNANDECC which gets faked.
 216                                                  // This saves us doing ECC checks.
 217
 218         return YAFFS_OK;
 219 }