lib_microblaze/board.c

   1 /*
   2  * (C) Copyright 2004 Atmark Techno, Inc.
   3  *
   4  * Yasushi SHOJI <yashi@atmark-techno.com>
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26 #include <command.h>
  27 #include <malloc.h>
  28 #include <version.h>
  29 #include <watchdog.h>
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 const char version_string[] =
  34         U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
  35
  36 /*
  37  * Begin and End of memory area for malloc(), and current "brk"
  38  */
  39 static ulong mem_malloc_start;
  40 static ulong mem_malloc_end;
  41 static ulong mem_malloc_brk;
  42
  43
  44 void *sbrk (ptrdiff_t increment)
  45 {
  46         ulong old = mem_malloc_brk;
  47         ulong new = old + increment;
  48
  49         if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
  50                 return (NULL);
  51         }
  52         mem_malloc_brk = new;
  53         return ((void *) old);
  54 }
  55
  56 /*
  57  * All attempts to come up with a "common" initialization sequence
  58  * that works for all boards and architectures failed: some of the
  59  * requirements are just _too_ different. To get rid of the resulting
  60  * mess of board dependend #ifdef'ed code we now make the whole
  61  * initialization sequence configurable to the user.
  62  *
  63  * The requirements for any new initalization function is simple: it
  64  * receives a pointer to the "global data" structure as it's only
  65  * argument, and returns an integer return code, where 0 means
  66  * "continue" and != 0 means "fatal error, hang the system".
  67  */
  68 typedef int (init_fnc_t) (void);
  69
  70 init_fnc_t *init_sequence[] = {
  71         serial_init,            /* serial communications setup */
  72         NULL,
  73 };
  74
  75 void board_init(void)
  76 {
  77         bd_t *bd;
  78         init_fnc_t **init_fnc_ptr;
  79
  80         /* Pointer is writable since we allocated a register for it. */
  81         gd = (gd_t *)CFG_GBL_DATA_OFFSET;
  82         memset((void *)gd, 0, CFG_GBL_DATA_SIZE);
  83
  84         gd->bd = (bd_t *)(gd+1);        /* At end of global data */
  85         gd->baudrate = CONFIG_BAUDRATE;
  86
  87         bd = gd->bd;
  88         bd->bi_baudrate = CONFIG_BAUDRATE;
  89
  90         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
  91                 WATCHDOG_RESET ();
  92                 if ((*init_fnc_ptr) () != 0) {
  93                         hang ();
  94                 }
  95         }
  96
  97         /* main_loop */
  98         for (;;) {
  99                 WATCHDOG_RESET ();
 100                 main_loop ();
 101         }
 102 }
 103
 104 void hang (void)
 105 {
 106         puts ("### ERROR ### Please RESET the board ###\n");
 107         for (;;);
 108 }