/*
 * (C) Copyright 2008-2011
 * Graeme Russ, <graeme.russ@gmail.com>
 *
 * (C) Copyright 2002
 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
 *
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.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 <watchdog.h>
#include <command.h>
#include <stdio_dev.h>
#include <version.h>
#include <malloc.h>
#include <net.h>
#include <ide.h>
#include <serial.h>
#include <asm/u-boot-x86.h>
#include <elf.h>

#ifdef CONFIG_BITBANGMII
#include <miiphy.h>
#endif

/*
 * Pointer to initial global data area
 *
 * Here we initialize it.
 */
#undef  XTRN_DECLARE_GLOBAL_DATA_PTR
#define XTRN_DECLARE_GLOBAL_DATA_PTR    /* empty = allocate here */
DECLARE_GLOBAL_DATA_PTR = (gd_t *) (CONFIG_SYS_INIT_GD_ADDR);


/* Exports from the Linker Script */
extern ulong __text_start;
extern ulong __data_end;
extern ulong __rel_dyn_start;
extern ulong __rel_dyn_end;
extern ulong __bss_start;
extern ulong __bss_end;

/************************************************************************
 * Init Utilities                                                       *
 ************************************************************************
 * Some of this code should be moved into the core functions,
 * or dropped completely,
 * but let's get it working (again) first...
 */
static int init_baudrate (void)
{
        char tmp[64];   /* long enough for environment variables */
        int i = getenv_f("baudrate", tmp, 64);

        gd->baudrate = (i != 0)
                        ? (int) simple_strtoul (tmp, NULL, 10)
                        : CONFIG_BAUDRATE;

        return (0);
}

static int display_banner (void)
{

        printf ("\n\n%s\n\n", version_string);
/*
        printf ("U-Boot code: %08lX -> %08lX  data: %08lX -> %08lX\n"
                "        BSS: %08lX -> %08lX stack: %08lX -> %08lX\n",
                i386boot_start, i386boot_romdata_start-1,
                i386boot_romdata_dest, i386boot_romdata_dest+i386boot_romdata_size-1,
                i386boot_bss_start, i386boot_bss_start+i386boot_bss_size-1,
                i386boot_bss_start+i386boot_bss_size,
                i386boot_bss_start+i386boot_bss_size+CONFIG_SYS_STACK_SIZE-1);

*/

        return (0);
}

static int display_dram_config (void)
{
        int i;

        puts ("DRAM Configuration:\n");

        for (i=0; i<CONFIG_NR_DRAM_BANKS; i++) {
                printf ("Bank #%d: %08lx ", i, gd->bd->bi_dram[i].start);
                print_size (gd->bd->bi_dram[i].size, "\n");
        }

        return (0);
}

static void display_flash_config (ulong size)
{
        puts ("Flash: ");
        print_size (size, "\n");
}

/*
 * Breath some life into the board...
 *
 * Initialize an SMC for serial comms, and carry out some hardware
 * tests.
 *
 * The first part of initialization is running from Flash memory;
 * its main purpose is to initialize the RAM so that we
 * can relocate the monitor code to RAM.
 */

/*
 * 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".
 */
typedef int (init_fnc_t) (void);

static int calculate_relocation_address(void);
static int copy_uboot_to_ram(void);
static int clear_bss(void);
static int do_elf_reloc_fixups(void);

init_fnc_t *init_sequence_f[] = {
        cpu_init_f,
        board_early_init_f,
        env_init,
        init_baudrate,
        serial_init,
        console_init_f,
        dram_init_f,
        calculate_relocation_address,
        copy_uboot_to_ram,
        clear_bss,
        do_elf_reloc_fixups,

        NULL,
};

init_fnc_t *init_sequence_r[] = {
        cpu_init_r,             /* basic cpu dependent setup */
        board_early_init_r,     /* basic board dependent setup */
        dram_init,              /* configure available RAM banks */
        interrupt_init,         /* set up exceptions */
        timer_init,
        display_banner,
        display_dram_config,

        NULL,
};

gd_t *gd;

static int calculate_relocation_address(void)
{
        void *text_start = &__text_start;
        void *bss_end = &__bss_end;
        void *dest_addr;
        ulong rel_offset;

        /* Calculate destination RAM Address and relocation offset */
        dest_addr = (void *)gd->ram_size;
        dest_addr -= CONFIG_SYS_STACK_SIZE;
        dest_addr -= (bss_end - text_start);
        rel_offset = dest_addr - text_start;

        gd->start_addr_sp = gd->ram_size;
        gd->relocaddr = (ulong)dest_addr;
        gd->reloc_off = rel_offset;

        return 0;
}

static int copy_uboot_to_ram(void)
{
        ulong *dst_addr = (ulong *)gd->relocaddr;
        ulong *src_addr = (ulong *)&__text_start;
        ulong *end_addr = (ulong *)&__data_end;

        while (src_addr < end_addr)
                *dst_addr++ = *src_addr++;

        return 0;
}

static int clear_bss(void)
{
        void *bss_start = &__bss_start;
        void *bss_end = &__bss_end;

        ulong *dst_addr = (ulong *)(bss_start + gd->reloc_off);
        ulong *end_addr = (ulong *)(bss_end + gd->reloc_off);;

        while (dst_addr < end_addr)
                *dst_addr++ = 0x00000000;

        return 0;
}

static int do_elf_reloc_fixups(void)
{
        Elf32_Rel *re_src = (Elf32_Rel *)(&__rel_dyn_start);
        Elf32_Rel *re_end = (Elf32_Rel *)(&__rel_dyn_end);

        do {
                if (re_src->r_offset >= CONFIG_SYS_TEXT_BASE)
                        if (*(Elf32_Addr *)(re_src->r_offset + gd->reloc_off) >= CONFIG_SYS_TEXT_BASE)
                                *(Elf32_Addr *)(re_src->r_offset + gd->reloc_off) += gd->reloc_off;
        } while (re_src++ < re_end);

        return 0;
}

/* Load U-Boot into RAM, initialize BSS, perform relocation adjustments */
void board_init_f(ulong boot_flags)
{
        init_fnc_t **init_fnc_ptr;

        gd->flags = boot_flags;

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

        gd->flags |= GD_FLG_RELOC;

        /* Enter the relocated U-Boot! */
        relocate_code(gd->start_addr_sp, gd, gd->relocaddr);

        /* NOTREACHED - relocate_code() does not return */
        while(1);
}

void board_init_r(gd_t *id, ulong dest_addr)
{
        char *s;
        ulong size;
        static bd_t bd_data;
        static gd_t gd_data;
        init_fnc_t **init_fnc_ptr;

        show_boot_progress(0x21);

        /* Global data pointer is now writable */
        gd = &gd_data;
        memcpy(gd, id, sizeof(gd_t));

        /* compiler optimization barrier needed for GCC >= 3.4 */
        __asm__ __volatile__("": : :"memory");

        gd->bd = &bd_data;
        memset (gd->bd, 0, sizeof (bd_t));
        show_boot_progress(0x22);

        gd->baudrate =  CONFIG_BAUDRATE;

        mem_malloc_init((((ulong)dest_addr - CONFIG_SYS_MALLOC_LEN)+3)&~3,
                        CONFIG_SYS_MALLOC_LEN);

        for (init_fnc_ptr = init_sequence_r; *init_fnc_ptr; ++init_fnc_ptr) {
                if ((*init_fnc_ptr)() != 0)
                        hang ();
        }
        show_boot_progress(0x23);

#ifdef CONFIG_SERIAL_MULTI
        serial_initialize();
#endif
        /* configure available FLASH banks */
        size = flash_init();
        display_flash_config(size);
        show_boot_progress(0x24);

        show_boot_progress(0x25);

        /* initialize environment */
        env_relocate ();
        show_boot_progress(0x26);


#ifdef CONFIG_CMD_NET
        /* IP Address */
        bd_data.bi_ip_addr = getenv_IPaddr ("ipaddr");
#endif

#if defined(CONFIG_PCI)
        /*
         * Do pci configuration
         */
        pci_init();
#endif

        show_boot_progress(0x27);


        stdio_init ();

        jumptable_init ();

        /* Initialize the console (after the relocation and devices init) */
        console_init_r();

#ifdef CONFIG_MISC_INIT_R
        /* miscellaneous platform dependent initialisations */
        misc_init_r();
#endif

#if defined(CONFIG_CMD_PCMCIA) && !defined(CONFIG_CMD_IDE)
        WATCHDOG_RESET();
        puts ("PCMCIA:");
        pcmcia_init();
#endif

#if defined(CONFIG_CMD_KGDB)
        WATCHDOG_RESET();
        puts("KGDB:  ");
        kgdb_init();
#endif

        /* enable exceptions */
        enable_interrupts();
        show_boot_progress(0x28);

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

        udelay(20);

        /* Initialize from environment */
        if ((s = getenv ("loadaddr")) != NULL) {
                load_addr = simple_strtoul (s, NULL, 16);
        }
#if defined(CONFIG_CMD_NET)
        if ((s = getenv ("bootfile")) != NULL) {
                copy_filename (BootFile, s, sizeof (BootFile));
        }
#endif

        WATCHDOG_RESET();

#if defined(CONFIG_CMD_IDE)
        WATCHDOG_RESET();
        puts("IDE:   ");
        ide_init();
#endif

#if defined(CONFIG_CMD_SCSI)
        WATCHDOG_RESET();
        puts("SCSI:  ");
        scsi_init();
#endif

#if defined(CONFIG_CMD_DOC)
        WATCHDOG_RESET();
        puts("DOC:   ");
        doc_init();
#endif

#ifdef CONFIG_BITBANGMII
        bb_miiphy_init();
#endif
#if defined(CONFIG_CMD_NET)
#if defined(CONFIG_NET_MULTI)
        WATCHDOG_RESET();
        puts("Net:   ");
#endif
        eth_initialize(gd->bd);
#endif

#if ( defined(CONFIG_CMD_NET)) && (0)
        WATCHDOG_RESET();
# ifdef DEBUG
        puts ("Reset Ethernet PHY\n");
# endif
        reset_phy();
#endif

#ifdef CONFIG_LAST_STAGE_INIT
        WATCHDOG_RESET();
        /*
         * Some parts can be only initialized if all others (like
         * Interrupts) are up and running (i.e. the PC-style ISA
         * keyboard).
         */
        last_stage_init();
#endif


#ifdef CONFIG_POST
        post_run (NULL, POST_RAM | post_bootmode_get(0));
#endif


        show_boot_progress(0x29);

        /* main_loop() can return to retry autoboot, if so just run it again. */
        for (;;) {
                main_loop();
        }

        /* NOTREACHED - no way out of command loop except booting */
}

void hang (void)
{
        puts ("### ERROR ### Please RESET the board ###\n");
        for (;;);
}

unsigned long do_go_exec (ulong (*entry)(int, char * const []), int argc, char * const argv[])
{
        unsigned long ret = 0;
        char **argv_tmp;

        /*
         * x86 does not use a dedicated register to pass the pointer to
         * the global_data, so it is instead passed as argv[-1]. By using
         * argv[-1], the called 'Application' can use the contents of
         * argv natively. However, to safely use argv[-1] a new copy of
         * argv is needed with the extra element
         */
        argv_tmp = malloc(sizeof(char *) * (argc + 1));

        if (argv_tmp) {
                argv_tmp[0] = (char *)gd;

                memcpy(&argv_tmp[1], argv, (size_t)(sizeof(char *) * argc));

                ret = (entry) (argc, &argv_tmp[1]);
                free(argv_tmp);
        }

        return ret;
}

void setup_pcat_compatibility(void)
        __attribute__((weak, alias("__setup_pcat_compatibility")));

void __setup_pcat_compatibility(void)
{
}