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 <stdio_dev.h>
  29 #include <watchdog.h>
  30 #include <malloc.h>
  31 #include <net.h>
  32 #ifdef CONFIG_STATUS_LED
  33 #include <status_led.h>
  34 #endif
  35
  36 DECLARE_GLOBAL_DATA_PTR;
  37
  38 /*
  39  * All attempts to come up with a "common" initialization sequence
  40  * that works for all boards and architectures failed: some of the
  41  * requirements are just _too_ different. To get rid of the resulting
  42  * mess of board dependend #ifdef'ed code we now make the whole
  43  * initialization sequence configurable to the user.
  44  *
  45  * The requirements for any new initalization function is simple: it
  46  * receives a pointer to the "global data" structure as it's only
  47  * argument, and returns an integer return code, where 0 means
  48  * "continue" and != 0 means "fatal error, hang the system".
  49  */
  50
  51
  52 typedef int (init_fnc_t) (void);
  53
  54
  55 /************************************************************************
  56  * Initialization sequence                                              *
  57  ***********************************************************************/
  58
  59 init_fnc_t *init_sequence[] = {
  60
  61 #if defined(CONFIG_BOARD_EARLY_INIT_F)
  62         board_early_init_f,     /* Call board-specific init code early.*/
  63 #endif
  64
  65         env_init,
  66         serial_init,
  67         console_init_f,
  68         display_options,
  69         checkcpu,
  70         checkboard,
  71         NULL,                   /* Terminate this list */
  72 };
  73
  74
  75 /***********************************************************************/
  76 void board_init (void)
  77 {
  78         bd_t *bd;
  79         init_fnc_t **init_fnc_ptr;
  80         char *s, *e;
  81         int i;
  82
  83         /* Pointer is writable since we allocated a register for it.
  84          * Nios treats CONFIG_SYS_GBL_DATA_OFFSET as an address.
  85          */
  86         gd = (gd_t *)CONFIG_SYS_GBL_DATA_OFFSET;
  87         /* compiler optimization barrier needed for GCC >= 3.4 */
  88         __asm__ __volatile__("": : :"memory");
  89
  90         memset( gd, 0, CONFIG_SYS_GBL_DATA_SIZE );
  91
  92         gd->bd = (bd_t *)(gd+1);        /* At end of global data */
  93         gd->baudrate = CONFIG_BAUDRATE;
  94         gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
  95
  96         bd = gd->bd;
  97         bd->bi_memstart = CONFIG_SYS_SDRAM_BASE;
  98         bd->bi_memsize = CONFIG_SYS_SDRAM_SIZE;
  99         bd->bi_flashstart = CONFIG_SYS_FLASH_BASE;
 100 #if     defined(CONFIG_SYS_SRAM_BASE) && defined(CONFIG_SYS_SRAM_SIZE)
 101         bd->bi_sramstart= CONFIG_SYS_SRAM_BASE;
 102         bd->bi_sramsize = CONFIG_SYS_SRAM_SIZE;
 103 #endif
 104         bd->bi_baudrate = CONFIG_BAUDRATE;
 105
 106         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 107                 WATCHDOG_RESET ();
 108                 if ((*init_fnc_ptr) () != 0) {
 109                         hang ();
 110                 }
 111         }
 112
 113         WATCHDOG_RESET ();
 114
 115         /* The Malloc area is immediately below the monitor copy in RAM */
 116         mem_malloc_init(CONFIG_SYS_MALLOC_BASE, CONFIG_SYS_MALLOC_LEN);
 117
 118         WATCHDOG_RESET ();
 119         bd->bi_flashsize = flash_init();
 120
 121         WATCHDOG_RESET ();
 122         env_relocate();
 123
 124         bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
 125
 126         WATCHDOG_RESET ();
 127         stdio_init();
 128         jumptable_init();
 129         console_init_r();
 130         /*
 131          */
 132
 133         WATCHDOG_RESET ();
 134         interrupt_init ();
 135
 136 #ifdef CONFIG_STATUS_LED
 137         status_led_set(STATUS_LED_BOOT, STATUS_LED_BLINKING);
 138 #endif
 139
 140         /* main_loop */
 141         for (;;) {
 142                 WATCHDOG_RESET ();
 143                 main_loop ();
 144         }
 145 }
 146
 147
 148 /***********************************************************************/
 149
 150 void hang (void)
 151 {
 152 #ifdef CONFIG_STATUS_LED
 153         status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
 154         status_led_set(STATUS_LED_RED, STATUS_LED_BLINKING);
 155 #endif
 156         puts("### ERROR ### Please reset board ###\n");
 157         for (;;);
 158 }
 159
 160 unsigned long do_go_exec (ulong (*entry)(int, char *[]), int argc, char *argv[])
 161 {
 162         /*
 163          * x86 does not use a dedicated register to pass the pointer
 164          * to the global_data
 165          */
 166         argv[-1] = (char *)gd;
 167         return entry (argc, argv);
 168 }