lib_nios/board.c

   1 /*
   2  * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
   3  * Scott McNutt <smcnutt@psyent.com>
   4  *
   5  * (C) Copyright 2000-2002
   6  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   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 <devices.h>
  29 #include <watchdog.h>
  30 #include <net.h>
  31 #ifdef CONFIG_STATUS_LED
  32 #include <status_led.h>
  33 #endif
  34
  35
  36 /*
  37  * All attempts to come up with a "common" initialization sequence
  38  * that works for all boards and architectures failed: some of the
  39  * requirements are just _too_ different. To get rid of the resulting
  40  * mess of board dependend #ifdef'ed code we now make the whole
  41  * initialization sequence configurable to the user.
  42  *
  43  * The requirements for any new initalization function is simple: it
  44  * receives a pointer to the "global data" structure as it's only
  45  * argument, and returns an integer return code, where 0 means
  46  * "continue" and != 0 means "fatal error, hang the system".
  47  */
  48
  49
  50 extern void malloc_bin_reloc (void);
  51 typedef int (init_fnc_t) (void);
  52
  53 /*
  54  * Begin and End of memory area for malloc(), and current "brk"
  55  */
  56 static  ulong   mem_malloc_start = 0;
  57 static  ulong   mem_malloc_end   = 0;
  58 static  ulong   mem_malloc_brk   = 0;
  59
  60 /*
  61  * The Malloc area is immediately below the monitor copy in RAM
  62  */
  63 static void mem_malloc_init (void)
  64 {
  65         mem_malloc_start = CFG_MALLOC_BASE;
  66         mem_malloc_end = mem_malloc_start + CFG_MALLOC_LEN;
  67         mem_malloc_brk = mem_malloc_start;
  68         memset ((void *) mem_malloc_start,
  69                 0,
  70                 mem_malloc_end - mem_malloc_start);
  71 }
  72
  73 void *sbrk (ptrdiff_t increment)
  74 {
  75         ulong old = mem_malloc_brk;
  76         ulong new = old + increment;
  77
  78         if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
  79                 return (NULL);
  80         }
  81         mem_malloc_brk = new;
  82         return ((void *) old);
  83 }
  84
  85
  86 /************************************************************************
  87  * Initialization sequence                                              *
  88  ***********************************************************************/
  89
  90 init_fnc_t *init_sequence[] = {
  91
  92 #if defined(CONFIG_BOARD_EARLY_INIT_F)
  93         board_early_init_f,     /* Call board-specific init code early.*/
  94 #endif
  95
  96         env_init,
  97         serial_init,
  98         console_init_f,
  99         display_options,
 100         checkcpu,
 101         checkboard,
 102         NULL,                   /* Terminate this list */
 103 };
 104
 105
 106 /***********************************************************************/
 107 void board_init (void)
 108 {
 109         DECLARE_GLOBAL_DATA_PTR;
 110
 111         bd_t *bd;
 112         init_fnc_t **init_fnc_ptr;
 113         char *s, *e;
 114         int i;
 115
 116         /* Pointer is writable since we allocated a register for it.
 117          * Nios treats CFG_GBL_DATA_OFFSET as an address.
 118          */
 119         gd = (gd_t *)CFG_GBL_DATA_OFFSET;
 120         /* compiler optimization barrier needed for GCC >= 3.4 */
 121         __asm__ __volatile__("": : :"memory");
 122
 123         memset( gd, 0, CFG_GBL_DATA_SIZE );
 124
 125         gd->bd = (bd_t *)(gd+1);        /* At end of global data */
 126         gd->baudrate = CONFIG_BAUDRATE;
 127         gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
 128
 129         bd = gd->bd;
 130         bd->bi_memstart = CFG_SDRAM_BASE;
 131         bd->bi_memsize = CFG_SDRAM_SIZE;
 132         bd->bi_flashstart = CFG_FLASH_BASE;
 133 #if     defined(CFG_SRAM_BASE) && defined(CFG_SRAM_SIZE)
 134         bd->bi_sramstart= CFG_SRAM_BASE;
 135         bd->bi_sramsize = CFG_SRAM_SIZE;
 136 #endif
 137         bd->bi_baudrate = CONFIG_BAUDRATE;
 138
 139         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 140                 WATCHDOG_RESET ();
 141                 if ((*init_fnc_ptr) () != 0) {
 142                         hang ();
 143                 }
 144         }
 145
 146         WATCHDOG_RESET ();
 147         bd->bi_flashsize = flash_init();
 148
 149         WATCHDOG_RESET ();
 150         mem_malloc_init();
 151         malloc_bin_reloc();
 152         env_relocate();
 153
 154         bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
 155         s = getenv ("ethaddr");
 156         for (i = 0; i < 6; ++i) {
 157                 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
 158                 if (s) s = (*e) ? e + 1 : e;
 159         }
 160
 161         WATCHDOG_RESET ();
 162         devices_init();
 163         jumptable_init();
 164         console_init_r();
 165         /*
 166          */
 167
 168         WATCHDOG_RESET ();
 169         interrupt_init ();
 170
 171 #ifdef CONFIG_STATUS_LED
 172         status_led_set(STATUS_LED_BOOT, STATUS_LED_BLINKING);
 173 #endif
 174
 175         /* main_loop */
 176         for (;;) {
 177                 WATCHDOG_RESET ();
 178                 main_loop ();
 179         }
 180 }
 181
 182
 183 /***********************************************************************/
 184
 185 void hang (void)
 186 {
 187 #ifdef CONFIG_STATUS_LED
 188         status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
 189         status_led_set(STATUS_LED_RED, STATUS_LED_BLINKING);
 190 #endif
 191         puts("### ERROR ### Please reset board ###\n");
 192         for (;;);
 193 }