lib_mips/board.c

   1 /*
   2  * (C) Copyright 2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <malloc.h>
  27 #include <devices.h>
  28 #include <syscall.h>
  29 #include <version.h>
  30 #include <net.h>
  31 #include <environment.h>
  32
  33 #if ( ((CFG_ENV_ADDR+CFG_ENV_SIZE) < CFG_MONITOR_BASE) || \
  34       (CFG_ENV_ADDR >= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)) ) || \
  35     defined(CFG_ENV_IS_IN_NVRAM)
  36 #define TOTAL_MALLOC_LEN        (CFG_MALLOC_LEN + CFG_ENV_SIZE)
  37 #else
  38 #define TOTAL_MALLOC_LEN        CFG_MALLOC_LEN
  39 #endif
  40
  41 #undef DEBUG
  42
  43 extern int timer_init(void);
  44
  45 const char version_string[] =
  46         U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
  47
  48 static char *failed = "*** failed ***\n";
  49
  50 /*
  51  * Begin and End of memory area for malloc(), and current "brk"
  52  */
  53 static ulong mem_malloc_start;
  54 static ulong mem_malloc_end;
  55 static ulong mem_malloc_brk;
  56
  57
  58 /*
  59  * The Malloc area is immediately below the monitor copy in DRAM
  60  */
  61 static void mem_malloc_init (void)
  62 {
  63         DECLARE_GLOBAL_DATA_PTR;
  64
  65         ulong dest_addr = CFG_MONITOR_BASE + gd->reloc_off;
  66
  67         mem_malloc_end = dest_addr;
  68         mem_malloc_start = dest_addr - TOTAL_MALLOC_LEN;
  69         mem_malloc_brk = mem_malloc_start;
  70
  71         memset ((void *) mem_malloc_start,
  72                 0,
  73                 mem_malloc_end - mem_malloc_start);
  74 }
  75
  76 void *sbrk (ptrdiff_t increment)
  77 {
  78         ulong old = mem_malloc_brk;
  79         ulong new = old + increment;
  80
  81         if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
  82                 return (NULL);
  83         }
  84         mem_malloc_brk = new;
  85         return ((void *) old);
  86 }
  87
  88
  89 static int init_func_ram (void)
  90 {
  91         DECLARE_GLOBAL_DATA_PTR;
  92
  93 #ifdef  CONFIG_BOARD_TYPES
  94         int board_type = gd->board_type;
  95 #else
  96         int board_type = 0;     /* use dummy arg */
  97 #endif
  98         puts ("DRAM:  ");
  99
 100         if ((gd->ram_size = initdram (board_type)) > 0) {
 101                 print_size (gd->ram_size, "\n");
 102                 return (0);
 103         }
 104         puts (failed);
 105         return (1);
 106 }
 107
 108 static int display_banner(void)
 109 {
 110
 111         printf ("\n\n%s\n\n", version_string);
 112         return (0);
 113 }
 114
 115 static void display_flash_config(ulong size)
 116 {
 117         puts ("Flash: ");
 118         print_size (size, "\n");
 119 }
 120
 121
 122 static int init_baudrate (void)
 123 {
 124         DECLARE_GLOBAL_DATA_PTR;
 125
 126         uchar tmp[64];  /* long enough for environment variables */
 127         int i = getenv_r ("baudrate", tmp, sizeof (tmp));
 128
 129         gd->baudrate = (i > 0)
 130                         ? (int) simple_strtoul (tmp, NULL, 10)
 131                         : CONFIG_BAUDRATE;
 132
 133         return (0);
 134 }
 135
 136
 137 /*
 138  * Breath some life into the board...
 139  *
 140  * The first part of initialization is running from Flash memory;
 141  * its main purpose is to initialize the RAM so that we
 142  * can relocate the monitor code to RAM.
 143  */
 144
 145 /*
 146  * All attempts to come up with a "common" initialization sequence
 147  * that works for all boards and architectures failed: some of the
 148  * requirements are just _too_ different. To get rid of the resulting
 149  * mess of board dependend #ifdef'ed code we now make the whole
 150  * initialization sequence configurable to the user.
 151  *
 152  * The requirements for any new initalization function is simple: it
 153  * receives a pointer to the "global data" structure as it's only
 154  * argument, and returns an integer return code, where 0 means
 155  * "continue" and != 0 means "fatal error, hang the system".
 156  */
 157 typedef int (init_fnc_t) (void);
 158
 159 init_fnc_t *init_sequence[] = {
 160         timer_init,
 161         env_init,               /* initialize environment */
 162         init_baudrate,          /* initialze baudrate settings */
 163         serial_init,            /* serial communications setup */
 164         console_init_f,
 165         display_banner,         /* say that we are here */
 166         checkboard,
 167         init_func_ram,
 168         NULL,
 169 };
 170
 171
 172 void board_init_f(ulong bootflag)
 173 {
 174         DECLARE_GLOBAL_DATA_PTR;
 175
 176         gd_t gd_data, *id;
 177         bd_t *bd;
 178         init_fnc_t **init_fnc_ptr;
 179         ulong addr, addr_sp, len   = CFG_MONITOR_LEN;
 180 #ifdef CONFIG_PURPLE
 181         void copy_code (ulong);
 182 #endif
 183
 184                 /* Pointer is writable since we allocated a register for it.
 185                  */
 186         gd = &gd_data;
 187         memset (gd, 0, sizeof (gd_t));
 188
 189         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 190                 if ((*init_fnc_ptr)() != 0) {
 191                         hang ();
 192                 }
 193         }
 194
 195         /*
 196          * Now that we have DRAM mapped and working, we can
 197          * relocate the code and continue running from DRAM.
 198          */
 199         addr = CFG_SDRAM_BASE + gd->ram_size;
 200
 201                 /* We can reserve some RAM "on top" here.
 202                  */
 203
 204                 /* round down to next 4 kB limit.
 205                  */
 206         addr &= ~(4096 - 1);
 207 #ifdef DEBUG
 208         printf ("Top of RAM usable for U-Boot at: %08lx\n", addr);
 209 #endif
 210
 211                 /* Reserve memory for U-Boot code, data & bss
 212                  * round down to next 4 kB limit
 213                  */
 214         addr -= len;
 215         addr &= ~(4096 - 1);
 216
 217 #ifdef DEBUG
 218         printf ("Reserving %ldk for U-Boot at: %08lx\n", len >> 10, addr);
 219 #endif
 220
 221                 /* Reserve memory for malloc() arena.
 222                  */
 223         addr_sp = addr - TOTAL_MALLOC_LEN;
 224 #ifdef DEBUG
 225         printf ("Reserving %dk for malloc() at: %08lx\n",
 226                         TOTAL_MALLOC_LEN >> 10, addr_sp);
 227 #endif
 228
 229         /*
 230          * (permanently) allocate a Board Info struct
 231          * and a permanent copy of the "global" data
 232          */
 233         addr_sp -= sizeof(bd_t);
 234         bd = (bd_t *)addr_sp;
 235         gd->bd = bd;
 236 #ifdef DEBUG
 237         printf ("Reserving %d Bytes for Board Info at: %08lx\n",
 238                         sizeof(bd_t), addr_sp);
 239 #endif
 240         addr_sp -= sizeof(gd_t);
 241         id = (gd_t *)addr_sp;
 242 #ifdef DEBUG
 243         printf ("Reserving %d Bytes for Global Data at: %08lx\n",
 244                         sizeof (gd_t), addr_sp);
 245 #endif
 246
 247                 /* Reserve memory for boot params.
 248                  */
 249         addr_sp -= CFG_BOOTPARAMS_LEN;
 250         bd->bi_boot_params = addr_sp;
 251 #ifdef DEBUG
 252         printf ("Reserving %dk for malloc() at: %08lx\n",
 253                         CFG_BOOTPARAMS_LEN >> 10, addr_sp);
 254 #endif
 255
 256         /*
 257          * Finally, we set up a new (bigger) stack.
 258          *
 259          * Leave some safety gap for SP, force alignment on 16 byte boundary
 260          * Clear initial stack frame
 261          */
 262         addr_sp -= 16;
 263         addr_sp &= ~0xF;
 264         *((ulong *) addr_sp)-- = 0;
 265         *((ulong *) addr_sp)-- = 0;
 266 #ifdef DEBUG
 267         printf ("Stack Pointer at: %08lx\n", addr_sp);
 268 #endif
 269         /*
 270          * Save local variables to board info struct
 271          */
 272         bd->bi_memstart = CFG_SDRAM_BASE;       /* start of  DRAM memory */
 273         bd->bi_memsize  = gd->ram_size;         /* size  of  DRAM memory in bytes */
 274         bd->bi_baudrate = gd->baudrate;         /* Console Baudrate */
 275
 276         memcpy (id, gd, sizeof (gd_t));
 277
 278         /* On the purple board we copy the code in a special way
 279          * in order to solve flash problems
 280          */
 281 #ifdef CONFIG_PURPLE
 282         copy_code(addr);
 283 #endif
 284
 285         relocate_code (addr_sp, id, addr);
 286
 287         /* NOTREACHED - relocate_code() does not return */
 288 }
 289 /************************************************************************
 290  *
 291  * This is the next part if the initialization sequence: we are now
 292  * running from RAM and have a "normal" C environment, i. e. global
 293  * data can be written, BSS has been cleared, the stack size in not
 294  * that critical any more, etc.
 295  *
 296  ************************************************************************
 297  */
 298
 299 void board_init_r (gd_t *id, ulong dest_addr)
 300 {
 301         DECLARE_GLOBAL_DATA_PTR;
 302
 303         cmd_tbl_t *cmdtp;
 304         ulong size;
 305         extern void malloc_bin_reloc (void);
 306 #ifndef CFG_ENV_IS_NOWHERE
 307         extern char * env_name_spec;
 308 #endif
 309         char *s, *e;
 310         bd_t *bd;
 311         int i;
 312
 313         gd = id;
 314         gd->flags |= GD_FLG_RELOC;      /* tell others: relocation done */
 315
 316 #ifdef DEBUG
 317         printf ("Now running in RAM - U-Boot at: %08lx\n", dest_addr);
 318 #endif
 319
 320         gd->reloc_off = dest_addr - CFG_MONITOR_BASE;
 321
 322         /*
 323          * We have to relocate the command table manually
 324          */
 325         for (cmdtp = &cmd_tbl[0]; cmdtp->name; cmdtp++) {
 326                 ulong addr;
 327
 328                 addr = (ulong) (cmdtp->cmd) + gd->reloc_off;
 329 #if 0
 330                 printf ("Command \"%s\": 0x%08lx => 0x%08lx\n",
 331                                 cmdtp->name, (ulong) (cmdtp->cmd), addr);
 332 #endif
 333                 cmdtp->cmd =
 334                         (int (*)(struct cmd_tbl_s *, int, int, char *[]))addr;
 335
 336                 addr = (ulong)(cmdtp->name) + gd->reloc_off;
 337                 cmdtp->name = (char *)addr;
 338
 339                 if (cmdtp->usage) {
 340                         addr = (ulong)(cmdtp->usage) + gd->reloc_off;
 341                         cmdtp->usage = (char *)addr;
 342                 }
 343 #ifdef  CFG_LONGHELP
 344                 if (cmdtp->help) {
 345                         addr = (ulong)(cmdtp->help) + gd->reloc_off;
 346                         cmdtp->help = (char *)addr;
 347                 }
 348 #endif
 349         }
 350         /* there are some other pointer constants we must deal with */
 351 #ifndef CFG_ENV_IS_NOWHERE
 352         env_name_spec += gd->reloc_off;
 353 #endif
 354
 355         /* configure available FLASH banks */
 356         size = flash_init();
 357         display_flash_config (size);
 358
 359         bd = gd->bd;
 360         bd->bi_flashstart = CFG_FLASH_BASE;
 361         bd->bi_flashsize = size;
 362 #if CFG_MONITOR_BASE == CFG_FLASH_BASE
 363         bd->bi_flashoffset = CFG_MONITOR_LEN;   /* reserved area for U-Boot */
 364 #else
 365         bd->bi_flashoffset = 0;
 366 #endif
 367
 368         /* initialize malloc() area */
 369         mem_malloc_init();
 370         malloc_bin_reloc();
 371
 372         /* relocate environment function pointers etc. */
 373         env_relocate();
 374
 375         /* board MAC address */
 376         s = getenv ("ethaddr");
 377         for (i = 0; i < 6; ++i) {
 378                 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
 379                 if (s)
 380                         s = (*e) ? e + 1 : e;
 381         }
 382
 383         /* IP Address */
 384         bd->bi_ip_addr = getenv_IPaddr("ipaddr");
 385
 386 /** leave this here (after malloc(), environment and PCI are working) **/
 387         /* Initialize devices */
 388         devices_init ();
 389
 390         /* allocate syscalls table (console_init_r will fill it in */
 391         syscall_tbl = (void **) malloc (NR_SYSCALLS * sizeof (void *));
 392
 393         /* Initialize the console (after the relocation and devices init) */
 394         console_init_r ();
 395 /** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **/
 396
 397         /* Initialize from environment */
 398         if ((s = getenv ("loadaddr")) != NULL) {
 399                 load_addr = simple_strtoul (s, NULL, 16);
 400         }
 401 #if (CONFIG_COMMANDS & CFG_CMD_NET)
 402         if ((s = getenv ("bootfile")) != NULL) {
 403                 copy_filename (BootFile, s, sizeof (BootFile));
 404         }
 405 #endif  /* CFG_CMD_NET */
 406
 407 #if defined(CONFIG_MISC_INIT_R)
 408         /* miscellaneous platform dependent initialisations */
 409         misc_init_r ();
 410 #endif
 411
 412 #if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_NET_MULTI)
 413         puts ("Net:   ");
 414         eth_initialize(gd->bd);
 415 #endif
 416
 417         /* main_loop() can return to retry autoboot, if so just run it again. */
 418         for (;;) {
 419                 main_loop ();
 420         }
 421
 422         /* NOTREACHED - no way out of command loop except booting */
 423 }
 424
 425 void hang (void)
 426 {
 427         puts ("### ERROR ### Please RESET the board ###\n");
 428         for (;;);
 429 }
 430