betty/fwflash.c

   1 /*
   2  * fwflash.c - handling the betty flashes
   3  *
   4  * author: hackbard@hackdaworld.org
   5  *
   6  */
   7
   8 /*
   9  * include files
  10  */
  11
  12 #include <stdio.h>
  13
  14 #include "lpc2xxx.h"
  15
  16 /*
  17  * defines
  18  */
  19
  20 /* bank 0/2 and boootloader addr/size */
  21 #define BANK0                   0x80000000
  22 #define BANK2                   0x82000000
  23 #define BANK_SIZE               0x00100000
  24 #define BOOTLOADER              0x7fffe000
  25 #define BL_SIZE                 0x00002000
  26
  27 /* flash cmd addresses - flash[0-18] <--> arm[1-19]*/
  28 #define B0F555  (*((volatile unsigned short *)(BANK0|0xaaa)))   // 0x555
  29 #define B0F2AA  (*((volatile unsigned short *)(BANK0|0x554)))   // 0x2aa
  30 #define B0F     (*((volatile unsigned short *)(BANK0)))
  31 #define B2F555  (*((volatile unsigned short *)(BANK2|0xaaa)))   // 0x555
  32 #define B2F2AA  (*((volatile unsigned short *)(BANK2|0x554)))   // 0x2aa
  33 #define B2F     (*((volatile unsigned short *)(BANK2)))
  34
  35 /* commands */
  36 #define CMD_READ                'R'
  37 #define CMD_WRITE               'W'
  38 #define CMD_CHIP_ERASE          'E'
  39 #define CMD_SECTOR_ERASE        'S'
  40 #define CMD_CHIP_ID             'I'
  41
  42 #define BUFSIZE                 16
  43
  44 /*
  45  * type definitions
  46  */
  47
  48 typedef unsigned char u8;
  49 typedef unsigned short u16;
  50 typedef unsigned int u32;
  51
  52 /*
  53  * sector addresses
  54  */
  55
  56 unsigned long sector_address[19]={
  57         0x00000,0x02000,0x03000,0x04000,0x08000,
  58         0x10000,0x18000,
  59         0x20000,0x28000,
  60         0x30000,0x38000,
  61         0x40000,0x48000,
  62         0x50000,0x58000,
  63         0x60000,0x68000,
  64         0x70000,0x78000
  65 };
  66
  67 /*
  68  * functions
  69  */
  70
  71 void uart0_send_byte(u8 send);
  72
  73 void mmap_init(u8 memtype) {
  74
  75         MEMMAP=memtype;
  76 }
  77
  78 void pll_init(void) {
  79
  80         /* configuration */
  81         PLLCFG=0x42;    // multiplier = 3 (for cclk), dividor = 4 (for f_cco)
  82         PLLCON=0x03;    // enable and set as clk source for the lpc
  83         /* feed sequence */
  84         PLLFEED=0xaa;
  85         PLLFEED=0x55;
  86         /* wait for lock */
  87         while(!(PLLSTAT&(1<<10)))
  88                 continue;
  89 }
  90
  91 void ext_mem_bank_init(void) {
  92
  93         BCFG0=0x10000420;       // flash 1
  94         BCFG1=0x00000c42;       // lcd
  95         BCFG2=0x10000420;       // flash 2
  96 }
  97
  98 void pin_select_init() {
  99
 100         /*
 101          * a[19:2] -> address lines
 102          */
 103
 104         PINSEL2=0x0d6041d4;
 105 }
 106
 107 void uart0_init(void) {
 108
 109         PINSEL0=0x05;                   // pin select -> tx, rx
 110         UART0_FCR=0x07;                 // enable fifo
 111         UART0_LCR=0x83;                 // set dlab + word length
 112         UART0_DLL=0x04;                 // br: 38400 @ 10/4 mhz
 113         UART0_DLM=0x00;
 114         UART0_LCR=0x03;                 // unset dlab
 115 }
 116
 117 void uart0_send_string(char *txbuf) {
 118
 119         int i;
 120
 121         i=0;
 122
 123         while(txbuf[i]) {
 124                 UART0_THR=txbuf[i++];
 125                 /* flush if tx buffer maximum reached */
 126                 if(!(i%16))
 127                         while(!(UART0_LSR&(1<<6)))
 128                                 continue;
 129         }
 130
 131         /* flush if \n and \r do not fit in the tx buffer */
 132         if(i>14)
 133                 while(!(UART0_LSR&(1<<6)))
 134                         continue;
 135
 136         UART0_THR='\n';
 137         UART0_THR='\r';
 138
 139         /* flush uart0 anyways */
 140         while(!(UART0_LSR&(1<<6)))
 141                 continue;
 142 }
 143
 144 void uart0_send_buf16(u16 *buf,int len) {
 145
 146         int i;
 147
 148         i=0;
 149
 150         for(i=0;i<len/2;i++) {
 151                 if(!(i%8))
 152                         while(!(UART0_LSR&(1<<6)))
 153                                 continue;
 154                 UART0_THR=buf[i]&0xff;
 155                 UART0_THR=(buf[i]>>8)&0xff;
 156         }
 157 }
 158
 159 void uart0_send_buf32(u32 *buf,int len) {
 160
 161         int i;
 162
 163         i=0;
 164
 165         for(i=0;i<len/4;i++) {
 166                 if(!(i%4))
 167                         while(!(UART0_LSR&(1<<6)))
 168                                 continue;
 169                 UART0_THR=buf[i]&0xff;
 170                 UART0_THR=(buf[i]>>8)&0xff;
 171                 UART0_THR=(buf[i]>>16)&0xff;
 172                 UART0_THR=(buf[i]>>24)&0xff;
 173         }
 174 }
 175
 176 void uart0_send_byte(u8 send) {
 177
 178         while(!(UART0_LSR&(1<<5)))
 179                 continue;
 180
 181         UART0_THR=send;
 182 }
 183
 184 u8 uart0_get_byte(void) {
 185
 186         u8 rx;
 187
 188         while(!(UART0_LSR&(1<<0)))
 189                 continue;
 190
 191         rx=UART0_RBR;
 192
 193         return rx;
 194 }
 195
 196 void flash_reset(u8 bank) {
 197
 198         if((bank!='0')&(bank!='2'))
 199                 return;
 200
 201         if(bank=='0')
 202                 B0F=0xf0;
 203         else
 204                 B2F=0xf0;
 205 }
 206
 207 void flash_sector_erase(u8 flash,u8 sector) {
 208
 209         u32 a18_12;
 210         u32 base;
 211
 212         if(sector>18)
 213                 return;
 214         a18_12=sector_address[sector]<<1;
 215
 216         if((flash!='0')&(flash!='2'))
 217                 return;
 218
 219         switch(flash) {
 220                 case '0':
 221                         base=0x80000000;
 222                         B0F555=0xaa;
 223                         B0F2AA=0x55;
 224                         B0F555=0x80;
 225                         B0F555=0xaa;
 226                         B0F2AA=0x55;
 227                         *((volatile u16 *)(base|a18_12))=0x30;
 228                         break;
 229                 case '2':
 230                         base=0x82000000;
 231                         B2F555=0xaa;
 232                         B2F2AA=0x55;
 233                         B2F555=0x80;
 234                         B2F555=0xaa;
 235                         B2F2AA=0x55;
 236                         *((volatile u16 *)(base|a18_12))=0x30;
 237                         break;
 238                 default:
 239                         return;
 240         }
 241
 242         return;
 243 }
 244
 245 void flash_chip_erase(u8 bank) {
 246
 247         u8 status;
 248
 249         if((bank!='0')&(bank!='2'))
 250                 return;
 251
 252         if(bank=='0') {
 253                 B0F555=0xaa;
 254                 B0F2AA=0x55;
 255                 B0F555=0x80;
 256                 B0F555=0xaa;
 257                 B0F2AA=0x55;
 258                 B0F555=0x10;
 259         }
 260         else {
 261                 B2F555=0xaa;
 262                 B2F2AA=0x55;
 263                 B2F555=0x80;
 264                 B2F555=0xaa;
 265                 B2F2AA=0x55;
 266                 B2F555=0x10;
 267         }
 268
 269         while(1) {
 270                 if(bank=='0')
 271                         status=B0F;
 272                 else
 273                         status=B2F;
 274
 275                 if(status&0x80)
 276                         break;
 277         }
 278 }
 279
 280 void unlock_bypass(u8 bank) {
 281
 282         if((bank!='0')&(bank!='2'))
 283                 return;
 284
 285         if(bank=='0') {
 286                 B0F555=0xaa;
 287                 B0F2AA=0x55;
 288                 B0F555=0x20;
 289         }
 290         else {
 291                 B2F555=0xaa;
 292                 B2F2AA=0x55;
 293                 B2F555=0x20;
 294         }
 295 }
 296
 297 void unlock_bypass_reset(u8 bank) {
 298
 299         if((bank!='0')&(bank!='2'))
 300                 return;
 301
 302         if(bank=='0') {
 303                 B0F=0x90;
 304                 B0F=0x00;
 305         }
 306         else {
 307                 B2F=0x90;
 308                 B2F=0x00;
 309         }
 310 }
 311
 312 int flash_write(u32 addr,u16 data) {
 313
 314         u16 check;
 315
 316         *((unsigned volatile short *)addr)=0xa0;
 317         *((unsigned volatile short *)addr)=data;
 318         while(1) {
 319                 check=*((unsigned short *)addr);
 320                 if((data&0x80)==(check&0x80))
 321                         break;
 322         }
 323         if(data!=check)
 324                 return -1;
 325
 326         return 0;
 327 }
 328
 329 int receive_data_and_write_to_flash(u32 addr,u32 datalen) {
 330
 331         u8 bank;
 332         u32 i,ret;
 333         u16 data;
 334         u8 cksm;
 335         u8 byte;
 336
 337         /* which bank to program */
 338         if(addr<0x82000000)
 339                 bank='0';
 340         else
 341                 bank='2';
 342
 343         /* unlock bypass */
 344         unlock_bypass(bank);
 345
 346         /* receive and write data */
 347         cksm=0;
 348         ret=0;
 349         for(i=0;i<datalen/2;i++) {
 350                 byte=uart0_get_byte();
 351                 uart0_send_byte(byte);
 352                 data=byte;
 353                 cksm+=byte;
 354                 byte=uart0_get_byte();
 355                 uart0_send_byte(byte);
 356                 cksm+=byte;
 357                 data|=byte<<8;
 358                 if(flash_write(addr,data)<0)
 359                         ret=-1;
 360                 addr+=2;
 361         }
 362
 363         /* relock bypass */
 364         unlock_bypass_reset(bank);
 365
 366         /* modify cksm on purpose, so the user knows ... */
 367         if(ret==-1)
 368                 cksm+=1;
 369
 370         /* send the cksm */
 371         uart0_send_byte(cksm);
 372
 373         return ret;
 374 }
 375
 376 /*
 377  * main function
 378  */
 379
 380 int main(void) {
 381
 382         /* variables */
 383
 384         u32 i,addrlen,datalen,addr;
 385         u8 buf[BUFSIZE];
 386         u16 data;
 387         u8 cmd;
 388         u8 txrx;
 389
 390         /* memory mapping of interrupt vectors to static ram */
 391
 392         //mmap_init(MMAP_RAM);
 393
 394         /* pll initialization */
 395         pll_init();
 396
 397         /* uart initialization */
 398         uart0_init();
 399
 400         /* external memory init */
 401         ext_mem_bank_init();
 402
 403         /* pin select init */
 404         pin_select_init();
 405
 406         /* begin the main loop */
 407         while(1) {
 408
 409         /* receive cmd */
 410         while(1) {
 411
 412                 cmd=uart0_get_byte();
 413                 txrx=1;
 414                 switch(cmd) {
 415                         case CMD_CHIP_ERASE:
 416                                 addrlen=0;
 417                                 datalen=1;
 418                                 break;
 419                         case CMD_SECTOR_ERASE:
 420                                 addrlen=0;
 421                                 datalen=2;
 422                                 break;
 423                         case CMD_READ:
 424                                 addrlen=4;
 425                                 datalen=4;
 426                         case CMD_WRITE:
 427                                 addrlen=4;
 428                                 datalen=4;
 429                                 break;
 430                         case CMD_CHIP_ID:
 431                                 addrlen=0;
 432                                 datalen=1;
 433                                 break;
 434                         default:
 435                                 txrx=0;
 436                                 break;
 437                 }
 438
 439                 if(txrx)
 440                         break;
 441         }
 442
 443         /* receive (only if there is) more data from uart0 */
 444         addr=0;
 445         for(i=0;i<addrlen;i++) {
 446                 txrx=uart0_get_byte();
 447                 addr|=(txrx<<((addrlen-i-1)*8));
 448         }
 449
 450         for(i=0;i<datalen;i++)
 451                 buf[i]=uart0_get_byte();
 452
 453         /* process the cmd */
 454         switch(cmd) {
 455                 case CMD_SECTOR_ERASE:
 456                         flash_sector_erase(buf[0],buf[1]);
 457                         break;
 458                 case CMD_READ:
 459                         /* data length to read */
 460                         datalen=buf[0]<<24|buf[1]<<16|buf[2]<<8|buf[3];
 461                         /* check addr and datalen */
 462                         if((addr>=BANK0)&(addr+datalen<=BANK0+BANK_SIZE))
 463                                 uart0_send_buf16((u16 *)addr,datalen);
 464                         if((addr>=BANK2)&(addr+datalen<=BANK2+BANK_SIZE))
 465                                 uart0_send_buf16((u16 *)addr,datalen);
 466                         if((addr>=BOOTLOADER)&(addr+datalen<=BOOTLOADER+BL_SIZE))
 467                                 uart0_send_buf32((u32 *)addr,datalen);
 468                         break;
 469                 case CMD_WRITE:
 470                         /* data length */
 471                         datalen=buf[0]<<24|buf[1]<<16|buf[2]<<8|buf[3];
 472                         /* check addr and data len */
 473                         if(((addr>=BANK0)&(addr+datalen<=BANK0+BANK_SIZE))|
 474                            ((addr>=BANK2)&(addr+datalen<=BANK2+BANK_SIZE)))
 475                                 receive_data_and_write_to_flash(addr,datalen);
 476                         break;
 477                 case CMD_CHIP_ERASE:
 478                         flash_chip_erase(buf[0]);
 479                         break;
 480                 case CMD_CHIP_ID:
 481                         if(buf[0]=='0') {
 482                                 B0F555=0xaa;
 483                                 B0F2AA=0x55;
 484                                 B0F555=0x90;
 485                                 data=*((u16 *)BANK0);
 486                                 uart0_send_buf16(&data,2);
 487                                 data=*((u16 *)(BANK0|0x200));
 488                                 uart0_send_buf16(&data,2);
 489                         }
 490                         else if(buf[0]=='2') {
 491                                 B2F555=0xaa;
 492                                 B2F2AA=0x55;
 493                                 B2F555=0x90;
 494                                 data=*((u16 *)BANK2);
 495                                 uart0_send_buf16(&data,2);
 496                                 data=*((u16 *)(BANK2|0x200));
 497                                 uart0_send_buf16(&data,2);
 498                         }
 499                         break;
 500                 default:
 501                         break;
 502         }
 503
 504         }
 505
 506         return 0;
 507 }
 508