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/*
* (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 <stdio_dev.h>
#include <asm/u-boot-x86.h>
#include <asm/relocate.h>
#include <asm/processor.h>
#include <asm/init_helpers.h>
#include <asm/init_wrappers.h>
/*
* Breath some life into the board...
*
* Getting the board up and running is a three-stage process:
* 1) Execute from Flash, SDRAM Uninitialised
* At this point, there is a limited amount of non-SDRAM memory
* (typically the CPU cache, but can also be SRAM or even a buffer of
* of some peripheral). This limited memory is used to hold:
* - The initial copy of the Global Data Structure
* - A temporary stack
* - A temporary x86 Global Descriptor Table
* - The pre-console buffer (if enabled)
*
* The following is performed during this phase of execution:
* - Core low-level CPU initialisation
* - Console initialisation
* - SDRAM initialisation
*
* 2) Execute from Flash, SDRAM Initialised
* At this point we copy Global Data from the initial non-SDRAM
* memory and set up the permanent stack in SDRAM. The CPU cache is no
* longer being used as temporary memory, so we can now fully enable
* it.
*
* The following is performed during this phase of execution:
* - Create final stack in SDRAM
* - Copy Global Data from temporary memory to SDRAM
* - Enabling of CPU cache(s),
* - Copying of U-Boot code and data from Flash to RAM
* - Clearing of the BSS
* - ELF relocation adjustments
*
* 3) Execute from SDRAM
* The following is performed during this phase of execution:
* - All remaining initialisation
*/
/*
* The requirements for any new initalization function is simple: it is
* a function with no parameters which returns an integer return code,
* where 0 means "continue" and != 0 means "fatal error, hang the system"
*/
typedef int (init_fnc_t) (void);
/*
* init_sequence_f is the list of init functions which are run when U-Boot
* is executing from Flash with a limited 'C' environment. The following
* limitations must be considered when implementing an '_f' function:
* - 'static' variables are read-only
* - Global Data (gd->xxx) is read/write
* - Stack space is limited
*
* The '_f' sequence must, as a minimum, initialise SDRAM. It _should_
* also initialise the console (to provide early debug output)
*/
init_fnc_t *init_sequence_f[] = {
cpu_init_f,
board_early_init_f,
env_init,
init_baudrate_f,
serial_init,
console_init_f,
dram_init_f,
calculate_relocation_address,
NULL,
};
/*
* init_sequence_f_r is the list of init functions which are run when
* U-Boot is executing from Flash with a semi-limited 'C' environment.
* The following limitations must be considered when implementing an
* '_f_r' function:
* - 'static' variables are read-only
* - Global Data (gd->xxx) is read/write
*
* The '_f_r' sequence must, as a minimum, copy U-Boot to RAM (if
* supported). It _should_, if possible, copy global data to RAM and
* initialise the CPU caches (to speed up the relocation process)
*/
init_fnc_t *init_sequence_f_r[] = {
init_cache_f_r,
copy_uboot_to_ram,
clear_bss,
do_elf_reloc_fixups,
NULL,
};
/*
* init_sequence_r is the list of init functions which are run when U-Boot
* is executing from RAM with a full 'C' environment. There are no longer
* any limitations which must be considered when implementing an '_r'
* function, (i.e.'static' variables are read/write)
*
* If not already done, the '_r' sequence must copy global data to RAM and
* (should) initialise the CPU caches.
*/
init_fnc_t *init_sequence_r[] = {
set_reloc_flag_r,
init_bd_struct_r,
mem_malloc_init_r,
cpu_init_r,
board_early_init_r,
dram_init,
interrupt_init,
timer_init,
display_banner,
display_dram_config,
serial_initialize_r,
#ifndef CONFIG_SYS_NO_FLASH
flash_init_r,
#endif
env_relocate_r,
#ifdef CONFIG_PCI
pci_init_r,
#endif
stdio_init,
jumptable_init_r,
console_init_r,
#ifdef CONFIG_MISC_INIT_R
misc_init_r,
#endif
#if defined(CONFIG_CMD_PCMCIA) && !defined(CONFIG_CMD_IDE)
pci_init_r,
#endif
#if defined(CONFIG_CMD_KGDB)
kgdb_init_r,
#endif
enable_interrupts_r,
#ifdef CONFIG_STATUS_LED
status_led_set_r,
#endif
set_load_addr_r,
#if defined(CONFIG_CMD_IDE)
ide_init_r,
#endif
#if defined(CONFIG_CMD_SCSI)
scsi_init_r,
#endif
#if defined(CONFIG_CMD_DOC)
doc_init_r,
#endif
#ifdef CONFIG_BITBANGMII
bb_miiphy_init_r,
#endif
#if defined(CONFIG_CMD_NET)
eth_initialize_r,
#ifdef CONFIG_RESET_PHY_R
reset_phy_r,
#endif
#endif
#ifdef CONFIG_LAST_STAGE_INIT
last_stage_init,
#endif
NULL,
};
static void do_init_loop(init_fnc_t **init_fnc_ptr)
{
for (; *init_fnc_ptr; ++init_fnc_ptr) {
WATCHDOG_RESET();
if ((*init_fnc_ptr)() != 0)
hang();
}
}
void board_init_f(ulong boot_flags)
{
gd->flags = boot_flags;
do_init_loop(init_sequence_f);
/*
* SDRAM and console are now initialised. The final stack can now
* be setup in SDRAM. Code execution will continue 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)
{
do_init_loop(init_sequence_f_r);
/*
* U-Boot has been copied into SDRAM, the BSS has been cleared etc.
* 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)
;
}
void board_init_r(gd_t *id, ulong dest_addr)
{
do_init_loop(init_sequence_r);
/* 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 (;;)
;
}
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