/*
 * (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>
#include <asm/processor.h>

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

/************************************************************************
 * 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)
{
	gd->baudrate = getenv_ulong("baudrate", 10, CONFIG_BAUDRATE);
	return 0;
}

static int display_banner(void)
{

	printf("\n\n%s\n\n", version_string);

	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;
}

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

/*
 * 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);
static int copy_gd_to_ram(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,

	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,
};

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

	/*
	 * NOTE: All destination address are rounded down to 16-byte
	 *       boundary to satisfy various worst-case alignment
	 *       requirements
	 */

	/* Global Data is at top of available memory */
	dest_addr = gd->ram_size;
	dest_addr -= GENERATED_GBL_DATA_SIZE;
	dest_addr &= ~15;
	gd->new_gd_addr = dest_addr;

	/* GDT is below Global Data */
	dest_addr -= X86_GDT_SIZE;
	dest_addr &= ~15;
	gd->gdt_addr = dest_addr;

	/* Stack is below GDT */
	gd->start_addr_sp = dest_addr;

	/* U-Boot is below the stack */
	dest_addr -= CONFIG_SYS_STACK_SIZE;
	dest_addr -= (bss_end - text_start);
	dest_addr &= ~15;
	gd->relocaddr = dest_addr;
	gd->reloc_off = (dest_addr - text_start);

	return 0;
}

static int copy_uboot_to_ram(void)
{
	size_t len = (size_t)&__data_end - (size_t)&__text_start;

	memcpy((void *)gd->relocaddr, (void *)&__text_start, len);

	return 0;
}

static int clear_bss(void)
{
	ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
	size_t len = (size_t)&__bss_end - (size_t)&__bss_start;

	memset((void *)dst_addr, 0x00, len);

	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);

	Elf32_Addr *offset_ptr_rom;
	Elf32_Addr *offset_ptr_ram;

	/* The size of the region of u-boot that runs out of RAM. */
	uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;

	do {
		/* Get the location from the relocation entry */
		offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;

		/* Check that the location of the relocation is in .text */
		if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE) {

			/* Switch to the in-RAM version */
			offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
							gd->reloc_off);

			/* Check that the target points into .text */
			if (*offset_ptr_ram >= CONFIG_SYS_TEXT_BASE &&
					*offset_ptr_ram <
					(CONFIG_SYS_TEXT_BASE + size)) {
				*offset_ptr_ram += 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();
	}

	/*
	 * SDRAM is now initialised, U-Boot has been copied into SDRAM,
	 * the BSS has been cleared etc. The final stack can now be setup
	 * in SDRAM. Code execution will continue (momentarily) in Flash,
	 * but with the stack in SDRAM and Global Data in temporary memory
	 * (CPU cache)
	 */
	board_init_f_r_trampoline(gd->start_addr_sp);

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

void board_init_f_r(void)
{
	if (copy_gd_to_ram() != 0)
		hang();

	if (init_cache() != 0)
		hang();

	copy_uboot_to_ram();
	clear_bss();
	do_elf_reloc_fixups();

	/*
	 * Transfer execution from Flash to RAM by calculating the address
	 * of the in-RAM copy of board_init_r() and calling it
	 */
	(board_init_r + gd->reloc_off)(gd, gd->relocaddr);

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

static int copy_gd_to_ram(void)
{
	gd_t *ram_gd;

	/*
	 * Global data is still in temporary memory (the CPU cache).
	 * calculate_relocation_address() has set gd->new_gd_addr to
	 * where the global data lives in RAM but getting it there
	 * safely is a bit tricky due to the 'F-Segment Hack' that
	 * we need to use for x86
	 */
	ram_gd = (gd_t *)gd->new_gd_addr;
	memcpy((void *)ram_gd, gd, sizeof(gd_t));

	/*
	 * Reload the Global Descriptor Table so FS points to the
	 * in-RAM copy of Global Data (calculate_relocation_address()
	 * has already calculated the in-RAM location of the GDT)
	 */
	ram_gd->gd_addr = (ulong)ram_gd;
	init_gd(ram_gd, (u64 *)gd->gdt_addr);

	return 0;
}

void board_init_r(gd_t *id, ulong dest_addr)
{
#if defined(CONFIG_CMD_NET)
	char *s;
#endif
#ifndef CONFIG_SYS_NO_FLASH
	ulong size;
#endif
	static bd_t bd_data;
	init_fnc_t **init_fnc_ptr;

	show_boot_progress(0x21);

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

	gd->flags |= GD_FLG_RELOC;

	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

#ifndef CONFIG_SYS_NO_FLASH
	/* configure available FLASH banks */
	size = flash_init();
	display_flash_config(size);
	show_boot_progress(0x24);
#endif

	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 */
	load_addr = getenv_ulong("loadaddr", 16, load_addr);
#if defined(CONFIG_CMD_NET)
	s = getenv("bootfile");

	if (s != 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)
	WATCHDOG_RESET();
	puts("Net:   ");
	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 (;;)
		;
}