contrib/smc9462tx-flash/dp83820_write.c

   1 /*
   2    DP83820 flash utility written by Dave Ashley for NXTV, Inc.
   3    Copyright (C) 2004 by NXTV, Inc.
   4    Written 20040219 by Dave Ashley.
   5
   6    Currently only supports the AT29C512
   7
   8    This code is released under the terms of the GPL. No warranty.
   9
  10
  11    THEORY:
  12    This code uses the /proc/dp83820 file which is created by the
  13    dp83820flash.o module. That file allows single byte reads + writes
  14    to the bootrom.
  15
  16 */
  17
  18 #include <unistd.h>
  19 #include <sys/io.h>
  20 #include <stdio.h>
  21 #include <unistd.h>
  22 #include <sys/mman.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <fcntl.h>
  26 #include <stdlib.h>
  27 #include <signal.h>
  28
  29
  30 // SMC9462TX card has D5 + D6 on the bootrom socket reversed
  31 int fixb(int val)
  32 {
  33         return (val&~0x60) | ((val&0x20)<<1) | ((val&0x40)>>1);
  34 }
  35 int openit(void)
  36 {
  37 int fd;
  38         fd=open("/proc/dp83820",O_RDWR);
  39         if(fd<0)
  40         {
  41                 printf("Failed to open the /proc/dp83820 file to access the flashrom.\n");
  42                 printf("Make sure you've done:\n");
  43                 printf("  modprobe dp83820flash\n");
  44                 exit(-1);
  45         }
  46         return fd;
  47 }
  48 void set(int addr, unsigned char val)
  49 {
  50 unsigned char msg[3];
  51 int fd;
  52         fd=openit();
  53         msg[0]=addr;
  54         msg[1]=addr>>8;
  55         msg[2]=val;
  56         write(fd,msg,3);
  57         close(fd);
  58 }
  59 int get(int addr)
  60 {
  61 unsigned char msg[2];
  62 int fd;
  63         fd=openit();
  64         msg[0]=addr;
  65         msg[1]=addr>>8;
  66         write(fd,msg,2);
  67         read(fd,msg,1);
  68         close(fd);
  69         return msg[0];
  70 }
  71
  72
  73 int getromsize(unsigned char *id)
  74 {
  75         if(id[0]==0xbf && id[1]==0xb6) return 0x40000;
  76         if(id[0]==0xc2 && id[1]==0xb0) return 0x40000;
  77         if(id[0]==0x1f && id[1]==0x3d) return 0x10000;
  78         return -1;
  79 }
  80
  81 #define MAXROMSIZE 0x200000
  82 unsigned char *buffer;
  83
  84 int loadfile(char *name)
  85 {
  86 int filefd;
  87 int filesize;
  88         filefd=open(name,O_RDONLY);
  89         if(filefd<0)
  90         {
  91                 printf("Couldn't open file %s\n",name);
  92                 return -1;
  93         }
  94         filesize=read(filefd,buffer,MAXROMSIZE);
  95         close(filefd);
  96         if(filesize<0)
  97         {
  98                 printf("Error trying to read from file %s\n",name);
  99         }
 100         return filesize;
 101 }
 102
 103 void readbios(char *name,int len)
 104 {
 105 int filefd;
 106 int filesize=0;
 107 unsigned char block[256];
 108 int i,j;
 109
 110         filefd=open(name,O_WRONLY|O_TRUNC|O_CREAT,0644);
 111         if(filefd<0)
 112         {
 113                 printf("Couldn't create file %s for writing\n",name);
 114                 return;
 115         }
 116         for(i=j=0;i<len;++i)
 117         {
 118                 block[j++]=get(i);
 119                 if(j<sizeof(block)) continue;
 120                 filesize+=write(filefd,block,j);
 121                 j=0;
 122         }
 123         close(filefd);
 124         if(filesize!=len)
 125         {
 126                 printf("Error during write of %s file\n",name);
 127                 return;
 128         }
 129         printf("BIOS contents saved to %s, $%x bytes\n",name,len);
 130 }
 131
 132 int verifybios(char *name,int len, int print)
 133 {
 134 int filelen;
 135 int i;
 136 int same=0;
 137
 138         filelen=loadfile(name);
 139         for(i=0;i<filelen;++i)
 140                 if(get(i)!=buffer[i]) break;
 141         if(i<filelen)
 142         {
 143                 if(print)
 144                         printf("BIOS contents does not match file %s, from byte $%x\n",
 145                                 name,i);
 146         } else
 147         {
 148                 if(print)
 149                         printf("BIOS contents match file %s for all of its $%x bytes\n",
 150                                 name,i);
 151                 same=1;
 152         }
 153         return same;
 154 }
 155
 156 void writebios(char *name,int len,unsigned char *id)
 157 {
 158 int i;
 159 int p1,p2;
 160 int sectorsize=128;
 161
 162         if(len!=loadfile(name))
 163         {
 164                 printf("File size does not match expected ROM size\n");
 165                 return;
 166         }
 167         if(0 && (id[0]!=0xbf || id[1]!=0xb6))
 168         {
 169                 printf("Don't know how to write this kind of flash device\n");
 170                 return;
 171         }
 172
 173         printf("Erasing device\n");
 174         set(0x5555,fixb(0xaa));
 175         set(0x2aaa,fixb(0x55));
 176         set(0x5555,fixb(0x80));
 177         set(0x5555,fixb(0xaa));
 178         set(0x2aaa,fixb(0x55));
 179         set(0x5555,fixb(0x10));
 180
 181         for(;;)
 182         {
 183                 printf(".");fflush(stdout);
 184                 usleep(250000);
 185                 if(get(0)==get(0) && get(0)==get(0))
 186                         break;
 187         }
 188         printf("BIOS erased\n");
 189
 190         printf("Writing to BIOS\n");
 191         p1=-1;
 192         for(i=0;i<len;++i)
 193         {
 194                 p2=100*i/(len-1);
 195                 if(p2!=p1)
 196                 {
 197                         printf("\r%d%%",p1=p2);
 198                         fflush(stdout);
 199                 }
 200                 if(i%sectorsize==0)
 201                 {
 202                         set(0x5555,fixb(0xaa));
 203                         set(0x2aaa,fixb(0x55));
 204                         set(0x5555,fixb(0xa0));
 205                 }
 206                 set(i,buffer[i]);
 207                 if(i%sectorsize==sectorsize-1)
 208                         while(get(0)!=get(0) || get(0)!=get(0));
 209         }
 210         printf("\n");
 211 }
 212
 213 void helptext(char *name)
 214 {
 215         printf("USE: %s <options>\n",name);
 216         printf("  -v <filename>  = verify bios rom contents with file\n");
 217         printf("  -w <filename>  = write to bios rom contents from file\n");
 218         printf("  -r <filename>  = read from bios rom contents to file\n");
 219         printf("  -f             = force erase/write even if contents already match\n");
 220         exit(0);
 221 }
 222
 223 int main(int argc,char **argv)
 224 {
 225 int i;
 226 int vals;
 227 unsigned char id[4];
 228 char *filename=0;
 229 char action=0;
 230 int romsize;
 231 int force=0;
 232 int same;
 233
 234         vals=0;
 235
 236         if(argc<2) helptext(argv[0]);
 237         for(i=1;i<argc;++i)
 238         {
 239                 if(argv[i][0]!='-')
 240                         helptext(argv[0]);
 241                 switch(argv[i][1])
 242                 {
 243                 case 'f':
 244                         force=1;
 245                         break;
 246                 case 'v':
 247                 case 'w':
 248                 case 'r':
 249                         action=argv[i][1];
 250                         if(i+1<argc)
 251                                 filename=argv[++i];
 252                         else helptext(argv[0]);
 253                         break;
 254                 default:
 255                         helptext(argv[0]);
 256                 }
 257
 258         }
 259
 260         buffer=malloc(MAXROMSIZE);
 261         if(!buffer)
 262         {
 263                 printf("No memory available!\n");
 264                 exit(-1);
 265         }
 266
 267         set(0x5555,fixb(0xaa)); // get into flash ID mode
 268         set(0x2aaa,fixb(0x55));
 269         set(0x5555,fixb(0x90));
 270
 271         for(i=0;i<4;++i) id[i]=get(i);
 272
 273         set(0x5555,fixb(0xaa)); // get out of flash ID mode
 274         set(0x2aaa,fixb(0x55));
 275         set(0x5555,fixb(0xf0));
 276         usleep(10000);
 277
 278         for(i=0;i<4;++i)
 279                 if(id[i]!=get(i)) break;
 280         if(i==4)
 281         {
 282                 printf("Could not read BIOS flashrom ID.\n");
 283                 goto biosdone;
 284         }
 285         printf("ID %02x %02x\n",id[0],id[1]);
 286         romsize=getromsize(id);
 287         if(romsize<0)
 288         {
 289                 printf("Unknown rom type\n");
 290                 goto biosdone;
 291         }
 292         printf("romsize=$%x bytes\n",romsize);
 293         if(action=='r')
 294                 readbios(filename,romsize);
 295         if(action=='w')
 296         {
 297                 if(!force)
 298                         same=verifybios(filename,romsize,0);
 299                 else
 300                         same=0;
 301                 if(!same)
 302                         writebios(filename,romsize,id);
 303         }
 304         if(action=='v' || action=='w')
 305                 verifybios(filename,romsize,1);
 306
 307 biosdone:
 308
 309         return 0;
 310 }