/*
 * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
 * Scott McNutt <smcnutt@psyent.com>
 *
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <devices.h>
#include <watchdog.h>
#include <net.h>
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

/*
 * All attempts to come up with a "common" initialization sequence
 * that works for all boards and architectures failed: some of the
 * requirements are just _too_ different. To get rid of the resulting
 * mess of board dependend #ifdef'ed code we now make the whole
 * initialization sequence configurable to the user.
 *
 * The requirements for any new initalization function is simple: it
 * receives a pointer to the "global data" structure as it's only
 * argument, and returns an integer return code, where 0 means
 * "continue" and != 0 means "fatal error, hang the system".
 */


extern void malloc_bin_reloc (void);
typedef int (init_fnc_t) (void);

/*
 * Begin and End of memory area for malloc(), and current "brk"
 */
static  ulong   mem_malloc_start = 0;
static  ulong   mem_malloc_end   = 0;
static  ulong   mem_malloc_brk   = 0;

/*
 * The Malloc area is immediately below the monitor copy in RAM
 */
static void mem_malloc_init (void)
{
        mem_malloc_start = CFG_MALLOC_BASE;
        mem_malloc_end = mem_malloc_start + CFG_MALLOC_LEN;
        mem_malloc_brk = mem_malloc_start;
        memset ((void *) mem_malloc_start,
                0,
                mem_malloc_end - mem_malloc_start);
}

void *sbrk (ptrdiff_t increment)
{
        ulong old = mem_malloc_brk;
        ulong new = old + increment;

        if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
                return (NULL);
        }
        mem_malloc_brk = new;
        return ((void *) old);
}


/************************************************************************
 * Initialization sequence                                              *
 ***********************************************************************/

init_fnc_t *init_sequence[] = {

#if defined(CONFIG_BOARD_EARLY_INIT_F)
        board_early_init_f,     /* Call board-specific init code early.*/
#endif

        env_init,
        serial_init,
        console_init_f,
        display_options,
        checkcpu,
        checkboard,
        NULL,                   /* Terminate this list */
};


/***********************************************************************/
void board_init (void)
{
        bd_t *bd;
        init_fnc_t **init_fnc_ptr;
        char *s, *e;
        int i;

        /* Pointer is writable since we allocated a register for it.
         * Nios treats CFG_GBL_DATA_OFFSET as an address.
         */
        gd = (gd_t *)CFG_GBL_DATA_OFFSET;
        /* compiler optimization barrier needed for GCC >= 3.4 */
        __asm__ __volatile__("": : :"memory");

        memset( gd, 0, CFG_GBL_DATA_SIZE );

        gd->bd = (bd_t *)(gd+1);        /* At end of global data */
        gd->baudrate = CONFIG_BAUDRATE;
        gd->cpu_clk = CONFIG_SYS_CLK_FREQ;

        bd = gd->bd;
        bd->bi_memstart = CFG_SDRAM_BASE;
        bd->bi_memsize = CFG_SDRAM_SIZE;
        bd->bi_flashstart = CFG_FLASH_BASE;
#if     defined(CFG_SRAM_BASE) && defined(CFG_SRAM_SIZE)
        bd->bi_sramstart= CFG_SRAM_BASE;
        bd->bi_sramsize = CFG_SRAM_SIZE;
#endif
        bd->bi_baudrate = CONFIG_BAUDRATE;

        for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
                WATCHDOG_RESET ();
                if ((*init_fnc_ptr) () != 0) {
                        hang ();
                }
        }

        WATCHDOG_RESET ();
        bd->bi_flashsize = flash_init();

        WATCHDOG_RESET ();
        mem_malloc_init();
        malloc_bin_reloc();
        env_relocate();

        bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
        s = getenv ("ethaddr");
        for (i = 0; i < 6; ++i) {
                bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
                if (s) s = (*e) ? e + 1 : e;
        }

        WATCHDOG_RESET ();
        devices_init();
        jumptable_init();
        console_init_r();
        /*
         */

        WATCHDOG_RESET ();
        interrupt_init ();

#ifdef CONFIG_STATUS_LED
        status_led_set(STATUS_LED_BOOT, STATUS_LED_BLINKING);
#endif

        /* main_loop */
        for (;;) {
                WATCHDOG_RESET ();
                main_loop ();
        }
}


/***********************************************************************/

void hang (void)
{
#ifdef CONFIG_STATUS_LED
        status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
        status_led_set(STATUS_LED_RED, STATUS_LED_BLINKING);
#endif
        puts("### ERROR ### Please reset board ###\n");
        for (;;);
}

unsigned long do_go_exec (ulong (*entry)(int, char *[]), int argc, char *argv[])
{
        /*
         * x86 does not use a dedicated register to pass the pointer
         * to the global_data
         */
        argv[-1] = (char *)gd;
        return entry (argc, argv);
}