lib_microblaze/board.c

   1 /*
   2  * (C) Copyright 2007 Michal Simek
   3  * (C) Copyright 2004 Atmark Techno, Inc.
   4  *
   5  * Michal  SIMEK <monstr@monstr.eu>
   6  * Yasushi SHOJI <yashi@atmark-techno.com>
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <malloc.h>
  30 #include <version.h>
  31 #include <watchdog.h>
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 const char version_string[] = U_BOOT_VERSION " (" __DATE__ " - " __TIME__ ")";
  36
  37 #ifdef CFG_GPIO_0
  38 extern int gpio_init (void);
  39 #endif
  40 #ifdef CFG_INTC_0
  41 extern int interrupts_init (void);
  42 #endif
  43 #if defined(CONFIG_CMD_NET)
  44 extern int eth_init (bd_t * bis);
  45 extern int getenv_IPaddr (char *);
  46 #endif
  47
  48 /*
  49  * Begin and End of memory area for malloc(), and current "brk"
  50  */
  51 static ulong mem_malloc_start;
  52 static ulong mem_malloc_end;
  53 static ulong mem_malloc_brk;
  54
  55 /*
  56  * The Malloc area is immediately below the monitor copy in DRAM
  57  * aka CFG_MONITOR_BASE - Note there is no need for reloc_off
  58  * as our monitory code is run from SDRAM
  59  */
  60 static void mem_malloc_init (void)
  61 {
  62         mem_malloc_end = (CFG_MALLOC_BASE + CFG_MALLOC_LEN);
  63         mem_malloc_start = CFG_MALLOC_BASE;
  64         mem_malloc_brk = mem_malloc_start;
  65         memset ((void *)mem_malloc_start, 0, mem_malloc_end - mem_malloc_start);
  66 }
  67
  68 void *sbrk (ptrdiff_t increment)
  69 {
  70         ulong old = mem_malloc_brk;
  71         ulong new = old + increment;
  72
  73         if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
  74                 return (NULL);
  75         }
  76         mem_malloc_brk = new;
  77         return ((void *)old);
  78 }
  79
  80 /*
  81  * All attempts to come up with a "common" initialization sequence
  82  * that works for all boards and architectures failed: some of the
  83  * requirements are just _too_ different. To get rid of the resulting
  84  * mess of board dependend #ifdef'ed code we now make the whole
  85  * initialization sequence configurable to the user.
  86  *
  87  * The requirements for any new initalization function is simple: it
  88  * receives a pointer to the "global data" structure as it's only
  89  * argument, and returns an integer return code, where 0 means
  90  * "continue" and != 0 means "fatal error, hang the system".
  91  */
  92 typedef int (init_fnc_t) (void);
  93
  94 init_fnc_t *init_sequence[] = {
  95         env_init,
  96         serial_init,
  97 #ifdef CFG_GPIO_0
  98         gpio_init,
  99 #endif
 100 #ifdef CFG_INTC_0
 101         interrupts_init,
 102 #endif
 103         NULL,
 104 };
 105
 106 void board_init (void)
 107 {
 108         bd_t *bd;
 109         init_fnc_t **init_fnc_ptr;
 110         gd = (gd_t *) CFG_GBL_DATA_OFFSET;
 111 #if defined(CONFIG_CMD_FLASH)
 112         ulong flash_size = 0;
 113 #endif
 114         asm ("nop");    /* FIXME gd is not initialize - wait */
 115         memset ((void *)gd, 0, CFG_GBL_DATA_SIZE);
 116         gd->bd = (bd_t *) (gd + 1);     /* At end of global data */
 117         gd->baudrate = CONFIG_BAUDRATE;
 118         bd = gd->bd;
 119         bd->bi_baudrate = CONFIG_BAUDRATE;
 120         bd->bi_memstart = CFG_SDRAM_BASE;
 121         bd->bi_memsize = CFG_SDRAM_SIZE;
 122
 123         /* Initialise malloc() area */
 124         mem_malloc_init ();
 125
 126         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 127                 WATCHDOG_RESET ();
 128                 if ((*init_fnc_ptr) () != 0) {
 129                         hang ();
 130                 }
 131         }
 132
 133 #if defined(CONFIG_CMD_FLASH)
 134         bd->bi_flashstart = CFG_FLASH_BASE;
 135         if (0 < (flash_size = flash_init ())) {
 136                 bd->bi_flashsize = flash_size;
 137                 bd->bi_flashoffset = CFG_FLASH_BASE + flash_size;
 138         } else {
 139                 puts ("Flash init FAILED");
 140                 bd->bi_flashstart = 0;
 141                 bd->bi_flashsize = 0;
 142                 bd->bi_flashoffset = 0;
 143         }
 144 #endif
 145
 146 #if defined(CONFIG_CMD_NET)
 147         char *s, *e;
 148         int i;
 149         /* board MAC address */
 150         s = getenv ("ethaddr");
 151         for (i = 0; i < 6; ++i) {
 152                 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
 153                 if (s)
 154                         s = (*e) ? e + 1 : e;
 155         }
 156         /* IP Address */
 157         bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
 158         eth_init (bd);
 159 #endif
 160
 161         /* relocate environment function pointers etc. */
 162         env_relocate ();
 163
 164         /* main_loop */
 165         for (;;) {
 166                 WATCHDOG_RESET ();
 167                 main_loop ();
 168         }
 169 }
 170
 171 void hang (void)
 172 {
 173         puts ("### ERROR ### Please RESET the board ###\n");
 174         for (;;) ;
 175 }