lib_nios2/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 #if defined(CONFIG_SYS_NIOS_EPCSBASE)
  35 #include <nios2-epcs.h>
  36 #endif
  37
  38 DECLARE_GLOBAL_DATA_PTR;
  39
  40 /*
  41  * All attempts to come up with a "common" initialization sequence
  42  * that works for all boards and architectures failed: some of the
  43  * requirements are just _too_ different. To get rid of the resulting
  44  * mess of board dependend #ifdef'ed code we now make the whole
  45  * initialization sequence configurable to the user.
  46  *
  47  * The requirements for any new initalization function is simple: it
  48  * receives a pointer to the "global data" structure as it's only
  49  * argument, and returns an integer return code, where 0 means
  50  * "continue" and != 0 means "fatal error, hang the system".
  51  */
  52
  53
  54 extern void malloc_bin_reloc (void);
  55 typedef int (init_fnc_t) (void);
  56
  57 /*
  58  * Begin and End of memory area for malloc(), and current "brk"
  59  */
  60 static  ulong   mem_malloc_start = 0;
  61 static  ulong   mem_malloc_end   = 0;
  62 static  ulong   mem_malloc_brk   = 0;
  63
  64 /*
  65  * The Malloc area is immediately below the monitor copy in RAM
  66  */
  67 static void mem_malloc_init (void)
  68 {
  69         mem_malloc_start = CONFIG_SYS_MALLOC_BASE;
  70         mem_malloc_end = mem_malloc_start + CONFIG_SYS_MALLOC_LEN;
  71         mem_malloc_brk = mem_malloc_start;
  72         memset ((void *) mem_malloc_start,
  73                 0,
  74                 mem_malloc_end - mem_malloc_start);
  75 }
  76
  77 void *sbrk (ptrdiff_t increment)
  78 {
  79         ulong old = mem_malloc_brk;
  80         ulong new = old + increment;
  81
  82         if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
  83                 return (NULL);
  84         }
  85         mem_malloc_brk = new;
  86         return ((void *) old);
  87 }
  88
  89
  90 /************************************************************************
  91  * Initialization sequence                                              *
  92  ***********************************************************************/
  93
  94 init_fnc_t *init_sequence[] = {
  95
  96 #if defined(CONFIG_BOARD_EARLY_INIT_F)
  97         board_early_init_f,     /* Call board-specific init code early.*/
  98 #endif
  99 #if defined(CONFIG_SYS_NIOS_EPCSBASE)
 100         epcs_reset,
 101 #endif
 102
 103         env_init,
 104         serial_init,
 105         console_init_f,
 106         display_options,
 107         checkcpu,
 108         checkboard,
 109         NULL,                   /* Terminate this list */
 110 };
 111
 112
 113 /***********************************************************************/
 114 void board_init (void)
 115 {
 116         bd_t *bd;
 117         init_fnc_t **init_fnc_ptr;
 118         char *s, *e;
 119         int i;
 120
 121         /* Pointer is writable since we allocated a register for it.
 122          * Nios treats CONFIG_SYS_GBL_DATA_OFFSET as an address.
 123          */
 124         gd = (gd_t *)CONFIG_SYS_GBL_DATA_OFFSET;
 125         /* compiler optimization barrier needed for GCC >= 3.4 */
 126         __asm__ __volatile__("": : :"memory");
 127
 128         memset( gd, 0, CONFIG_SYS_GBL_DATA_SIZE );
 129
 130         gd->bd = (bd_t *)(gd+1);        /* At end of global data */
 131         gd->baudrate = CONFIG_BAUDRATE;
 132         gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
 133
 134         bd = gd->bd;
 135         bd->bi_memstart = CONFIG_SYS_SDRAM_BASE;
 136         bd->bi_memsize = CONFIG_SYS_SDRAM_SIZE;
 137         bd->bi_flashstart = CONFIG_SYS_FLASH_BASE;
 138 #if     defined(CONFIG_SYS_SRAM_BASE) && defined(CONFIG_SYS_SRAM_SIZE)
 139         bd->bi_sramstart= CONFIG_SYS_SRAM_BASE;
 140         bd->bi_sramsize = CONFIG_SYS_SRAM_SIZE;
 141 #endif
 142         bd->bi_baudrate = CONFIG_BAUDRATE;
 143
 144         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 145                 WATCHDOG_RESET ();
 146                 if ((*init_fnc_ptr) () != 0) {
 147                         hang ();
 148                 }
 149         }
 150
 151         WATCHDOG_RESET ();
 152         bd->bi_flashsize = flash_init();
 153
 154         WATCHDOG_RESET ();
 155         mem_malloc_init();
 156         malloc_bin_reloc();
 157         env_relocate();
 158
 159         bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
 160         s = getenv ("ethaddr");
 161         for (i = 0; i < 6; ++i) {
 162                 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
 163                 if (s) s = (*e) ? e + 1 : e;
 164         }
 165
 166         WATCHDOG_RESET ();
 167         devices_init();
 168         jumptable_init();
 169         console_init_r();
 170
 171         WATCHDOG_RESET ();
 172         interrupt_init ();
 173
 174 #if defined(CONFIG_BOARD_LATE_INIT)
 175         board_late_init ();
 176 #endif
 177
 178         /* main_loop */
 179         for (;;) {
 180                 WATCHDOG_RESET ();
 181                 main_loop ();
 182         }
 183 }
 184
 185
 186 /***********************************************************************/
 187
 188 void hang (void)
 189 {
 190         disable_interrupts ();
 191         puts("### ERROR ### Please reset board ###\n");
 192         for (;;);
 193 }