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 <version.h>
  29 #include <net.h>
  30 #include <environment.h>
  31
  32 DECLARE_GLOBAL_DATA_PTR;
  33
  34 #if ( ((CFG_ENV_ADDR+CFG_ENV_SIZE) < CFG_MONITOR_BASE) || \
  35       (CFG_ENV_ADDR >= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)) ) || \
  36     defined(CFG_ENV_IS_IN_NVRAM)
  37 #define TOTAL_MALLOC_LEN        (CFG_MALLOC_LEN + CFG_ENV_SIZE)
  38 #else
  39 #define TOTAL_MALLOC_LEN        CFG_MALLOC_LEN
  40 #endif
  41
  42 #undef DEBUG
  43
  44 extern int timer_init(void);
  45
  46 extern int incaip_set_cpuclk(void);
  47
  48 extern ulong uboot_end_data;
  49 extern ulong uboot_end;
  50
  51 ulong monitor_flash_len;
  52
  53 const char version_string[] =
  54         U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
  55
  56 static char *failed = "*** failed ***\n";
  57
  58 /*
  59  * Begin and End of memory area for malloc(), and current "brk"
  60  */
  61 static ulong mem_malloc_start;
  62 static ulong mem_malloc_end;
  63 static ulong mem_malloc_brk;
  64
  65
  66 /*
  67  * The Malloc area is immediately below the monitor copy in DRAM
  68  */
  69 static void mem_malloc_init (void)
  70 {
  71         ulong dest_addr = CFG_MONITOR_BASE + gd->reloc_off;
  72
  73         mem_malloc_end = dest_addr;
  74         mem_malloc_start = dest_addr - TOTAL_MALLOC_LEN;
  75         mem_malloc_brk = mem_malloc_start;
  76
  77         memset ((void *) mem_malloc_start,
  78                 0,
  79                 mem_malloc_end - mem_malloc_start);
  80 }
  81
  82 void *sbrk (ptrdiff_t increment)
  83 {
  84         ulong old = mem_malloc_brk;
  85         ulong new = old + increment;
  86
  87         if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
  88                 return (NULL);
  89         }
  90         mem_malloc_brk = new;
  91         return ((void *) old);
  92 }
  93
  94
  95 static int init_func_ram (void)
  96 {
  97 #ifdef  CONFIG_BOARD_TYPES
  98         int board_type = gd->board_type;
  99 #else
 100         int board_type = 0;     /* use dummy arg */
 101 #endif
 102         puts ("DRAM:  ");
 103
 104         if ((gd->ram_size = initdram (board_type)) > 0) {
 105                 print_size (gd->ram_size, "\n");
 106                 return (0);
 107         }
 108         puts (failed);
 109         return (1);
 110 }
 111
 112 static int display_banner(void)
 113 {
 114
 115         printf ("\n\n%s\n\n", version_string);
 116         return (0);
 117 }
 118
 119 static void display_flash_config(ulong size)
 120 {
 121         puts ("Flash: ");
 122         print_size (size, "\n");
 123 }
 124
 125
 126 static int init_baudrate (void)
 127 {
 128         char tmp[64];   /* long enough for environment variables */
 129         int i = getenv_r ("baudrate", tmp, sizeof (tmp));
 130
 131         gd->baudrate = (i > 0)
 132                         ? (int) simple_strtoul (tmp, NULL, 10)
 133                         : CONFIG_BAUDRATE;
 134
 135         return (0);
 136 }
 137
 138
 139 /*
 140  * Breath some life into the board...
 141  *
 142  * The first part of initialization is running from Flash memory;
 143  * its main purpose is to initialize the RAM so that we
 144  * can relocate the monitor code to RAM.
 145  */
 146
 147 /*
 148  * All attempts to come up with a "common" initialization sequence
 149  * that works for all boards and architectures failed: some of the
 150  * requirements are just _too_ different. To get rid of the resulting
 151  * mess of board dependend #ifdef'ed code we now make the whole
 152  * initialization sequence configurable to the user.
 153  *
 154  * The requirements for any new initalization function is simple: it
 155  * receives a pointer to the "global data" structure as it's only
 156  * argument, and returns an integer return code, where 0 means
 157  * "continue" and != 0 means "fatal error, hang the system".
 158  */
 159 typedef int (init_fnc_t) (void);
 160
 161 init_fnc_t *init_sequence[] = {
 162         timer_init,
 163         env_init,               /* initialize environment */
 164 #ifdef CONFIG_INCA_IP
 165         incaip_set_cpuclk,      /* set cpu clock according to environment variable */
 166 #endif
 167         init_baudrate,          /* initialze baudrate settings */
 168         serial_init,            /* serial communications setup */
 169         console_init_f,
 170         display_banner,         /* say that we are here */
 171         checkboard,
 172         init_func_ram,
 173         NULL,
 174 };
 175
 176
 177 void board_init_f(ulong bootflag)
 178 {
 179         gd_t gd_data, *id;
 180         bd_t *bd;
 181         init_fnc_t **init_fnc_ptr;
 182         ulong addr, addr_sp, len = (ulong)&uboot_end - CFG_MONITOR_BASE;
 183         ulong *s;
 184 #ifdef CONFIG_PURPLE
 185         void copy_code (ulong);
 186 #endif
 187
 188         /* Pointer is writable since we allocated a register for it.
 189          */
 190         gd = &gd_data;
 191         /* compiler optimization barrier needed for GCC >= 3.4 */
 192         __asm__ __volatile__("": : :"memory");
 193
 194         memset ((void *)gd, 0, sizeof (gd_t));
 195
 196         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 197                 if ((*init_fnc_ptr)() != 0) {
 198                         hang ();
 199                 }
 200         }
 201
 202         /*
 203          * Now that we have DRAM mapped and working, we can
 204          * relocate the code and continue running from DRAM.
 205          */
 206         addr = CFG_SDRAM_BASE + gd->ram_size;
 207
 208         /* We can reserve some RAM "on top" here.
 209          */
 210
 211         /* round down to next 4 kB limit.
 212          */
 213         addr &= ~(4096 - 1);
 214         debug ("Top of RAM usable for U-Boot at: %08lx\n", addr);
 215
 216         /* Reserve memory for U-Boot code, data & bss
 217          * round down to next 16 kB limit
 218          */
 219         addr -= len;
 220         addr &= ~(16 * 1024 - 1);
 221
 222         debug ("Reserving %ldk for U-Boot at: %08lx\n", len >> 10, addr);
 223
 224          /* Reserve memory for malloc() arena.
 225          */
 226         addr_sp = addr - TOTAL_MALLOC_LEN;
 227         debug ("Reserving %dk for malloc() at: %08lx\n",
 228                         TOTAL_MALLOC_LEN >> 10, addr_sp);
 229
 230         /*
 231          * (permanently) allocate a Board Info struct
 232          * and a permanent copy of the "global" data
 233          */
 234         addr_sp -= sizeof(bd_t);
 235         bd = (bd_t *)addr_sp;
 236         gd->bd = bd;
 237         debug ("Reserving %d Bytes for Board Info at: %08lx\n",
 238                         sizeof(bd_t), addr_sp);
 239
 240         addr_sp -= sizeof(gd_t);
 241         id = (gd_t *)addr_sp;
 242         debug ("Reserving %d Bytes for Global Data at: %08lx\n",
 243                         sizeof (gd_t), addr_sp);
 244
 245         /* Reserve memory for boot params.
 246          */
 247         addr_sp -= CFG_BOOTPARAMS_LEN;
 248         bd->bi_boot_params = addr_sp;
 249         debug ("Reserving %dk for boot params() at: %08lx\n",
 250                         CFG_BOOTPARAMS_LEN >> 10, addr_sp);
 251
 252         /*
 253          * Finally, we set up a new (bigger) stack.
 254          *
 255          * Leave some safety gap for SP, force alignment on 16 byte boundary
 256          * Clear initial stack frame
 257          */
 258         addr_sp -= 16;
 259         addr_sp &= ~0xF;
 260         s = (ulong *)addr_sp;
 261         *s-- = 0;
 262         *s-- = 0;
 263         addr_sp = (ulong)s;
 264         debug ("Stack Pointer at: %08lx\n", addr_sp);
 265
 266         /*
 267          * Save local variables to board info struct
 268          */
 269         bd->bi_memstart = CFG_SDRAM_BASE;       /* start of  DRAM memory */
 270         bd->bi_memsize  = gd->ram_size;         /* size  of  DRAM memory in bytes */
 271         bd->bi_baudrate = gd->baudrate;         /* Console Baudrate */
 272
 273         memcpy (id, (void *)gd, sizeof (gd_t));
 274
 275         /* On the purple board we copy the code in a special way
 276          * in order to solve flash problems
 277          */
 278 #ifdef CONFIG_PURPLE
 279         copy_code(addr);
 280 #endif
 281
 282         relocate_code (addr_sp, id, addr);
 283
 284         /* NOTREACHED - relocate_code() does not return */
 285 }
 286 /************************************************************************
 287  *
 288  * This is the next part if the initialization sequence: we are now
 289  * running from RAM and have a "normal" C environment, i. e. global
 290  * data can be written, BSS has been cleared, the stack size in not
 291  * that critical any more, etc.
 292  *
 293  ************************************************************************
 294  */
 295
 296 void board_init_r (gd_t *id, ulong dest_addr)
 297 {
 298         cmd_tbl_t *cmdtp;
 299         ulong size;
 300         extern void malloc_bin_reloc (void);
 301 #ifndef CFG_ENV_IS_NOWHERE
 302         extern char * env_name_spec;
 303 #endif
 304         char *s, *e;
 305         bd_t *bd;
 306         int i;
 307
 308         gd = id;
 309         gd->flags |= GD_FLG_RELOC;      /* tell others: relocation done */
 310
 311         debug ("Now running in RAM - U-Boot at: %08lx\n", dest_addr);
 312
 313         gd->reloc_off = dest_addr - CFG_MONITOR_BASE;
 314
 315         monitor_flash_len = (ulong)&uboot_end_data - dest_addr;
 316
 317         /*
 318          * We have to relocate the command table manually
 319          */
 320         for (cmdtp = &__u_boot_cmd_start; cmdtp !=  &__u_boot_cmd_end; cmdtp++) {
 321                 ulong addr;
 322
 323                 addr = (ulong) (cmdtp->cmd) + gd->reloc_off;
 324 #if 0
 325                 printf ("Command \"%s\": 0x%08lx => 0x%08lx\n",
 326                                 cmdtp->name, (ulong) (cmdtp->cmd), addr);
 327 #endif
 328                 cmdtp->cmd =
 329                         (int (*)(struct cmd_tbl_s *, int, int, char *[]))addr;
 330
 331                 addr = (ulong)(cmdtp->name) + gd->reloc_off;
 332                 cmdtp->name = (char *)addr;
 333
 334                 if (cmdtp->usage) {
 335                         addr = (ulong)(cmdtp->usage) + gd->reloc_off;
 336                         cmdtp->usage = (char *)addr;
 337                 }
 338 #ifdef  CFG_LONGHELP
 339                 if (cmdtp->help) {
 340                         addr = (ulong)(cmdtp->help) + gd->reloc_off;
 341                         cmdtp->help = (char *)addr;
 342                 }
 343 #endif
 344         }
 345         /* there are some other pointer constants we must deal with */
 346 #ifndef CFG_ENV_IS_NOWHERE
 347         env_name_spec += gd->reloc_off;
 348 #endif
 349
 350         /* configure available FLASH banks */
 351         size = flash_init();
 352         display_flash_config (size);
 353
 354         bd = gd->bd;
 355         bd->bi_flashstart = CFG_FLASH_BASE;
 356         bd->bi_flashsize = size;
 357 #if CFG_MONITOR_BASE == CFG_FLASH_BASE
 358         bd->bi_flashoffset = monitor_flash_len; /* reserved area for U-Boot */
 359 #else
 360         bd->bi_flashoffset = 0;
 361 #endif
 362
 363         /* initialize malloc() area */
 364         mem_malloc_init();
 365         malloc_bin_reloc();
 366
 367         /* relocate environment function pointers etc. */
 368         env_relocate();
 369
 370         /* board MAC address */
 371         s = getenv ("ethaddr");
 372         for (i = 0; i < 6; ++i) {
 373                 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
 374                 if (s)
 375                         s = (*e) ? e + 1 : e;
 376         }
 377
 378         /* IP Address */
 379         bd->bi_ip_addr = getenv_IPaddr("ipaddr");
 380
 381 #if defined(CONFIG_PCI)
 382         /*
 383          * Do pci configuration
 384          */
 385         pci_init();
 386 #endif
 387
 388 /** leave this here (after malloc(), environment and PCI are working) **/
 389         /* Initialize devices */
 390         devices_init ();
 391
 392         jumptable_init ();
 393
 394         /* Initialize the console (after the relocation and devices init) */
 395         console_init_r ();
 396 /** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **/
 397
 398         /* Initialize from environment */
 399         if ((s = getenv ("loadaddr")) != NULL) {
 400                 load_addr = simple_strtoul (s, NULL, 16);
 401         }
 402 #if (CONFIG_COMMANDS & CFG_CMD_NET)
 403         if ((s = getenv ("bootfile")) != NULL) {
 404                 copy_filename (BootFile, s, sizeof (BootFile));
 405         }
 406 #endif  /* CFG_CMD_NET */
 407
 408 #if defined(CONFIG_MISC_INIT_R)
 409         /* miscellaneous platform dependent initialisations */
 410         misc_init_r ();
 411 #endif
 412
 413 #if (CONFIG_COMMANDS & CFG_CMD_NET)
 414 #if defined(CONFIG_NET_MULTI)
 415         puts ("Net:   ");
 416 #endif
 417         eth_initialize(gd->bd);
 418 #endif
 419
 420         /* main_loop() can return to retry autoboot, if so just run it again. */
 421         for (;;) {
 422                 main_loop ();
 423         }
 424
 425         /* NOTREACHED - no way out of command loop except booting */
 426 }
 427
 428 void hang (void)
 429 {
 430         puts ("### ERROR ### Please RESET the board ###\n");
 431         for (;;);
 432 }