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u-boot/arch/m68k/cpu/mcf530x/start.S
angelo@sysam.it e77e65dfc2 m68k: add mcf5307 cpu support 
Add Freescale MCF5307 cpu support.

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
2015-03-05 20:13:21 -05:00

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6.7 KiB
ArmAsm
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/*
* (C) Copyright 2015 Angelo Dureghello <angelo@sysam.it>
* Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
#include "version.h"
#include <asm/cache.h>
#ifndef CONFIG_IDENT_STRING
#define CONFIG_IDENT_STRING ""
#endif
#define _START _start
#define _FAULT _fault
.macro SAVE_ALL
move.w #0x2700,%sr; /* disable intrs */
subl #60,%sp; /* space for 15 regs */
moveml %d0-%d7/%a0-%a6,%sp@
.endm
.macro RESTORE_ALL
moveml %sp@,%d0-%d7/%a0-%a6;
addl #60,%sp; /* space for 15 regs */
rte
.endm
/* If we come from a pre-loader we don't need an initial exception
* table.
*/
#if !defined(CONFIG_MONITOR_IS_IN_RAM)
.text
/*
* Vector table. This is used for initial platform startup.
* These vectors are to catch any un-intended traps.
*/
_vectors:
/* Flash offset is 0 until we setup CS0 */
.long 0x00000000
#if defined(CONFIG_M5307) && \
(CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
.long _start - CONFIG_SYS_TEXT_BASE
#else
.long _START
#endif
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
#endif
.text
.globl _start
_start:
nop
nop
move.w #0x2700,%sr
/* set MBAR address + valid flag */
move.l #(CONFIG_SYS_MBAR + 1), %d0
move.c %d0, %MBAR
move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
move.c %d0, %RAMBAR
/* DS 4.8.2 (Cache Organization) invalidate and disable cache */
move.l #CF_CACR_CINVA, %d0
movec %d0, %CACR
move.l #0, %d0
movec %d0, %ACR0
movec %d0, %ACR1
/*
* if we come from a pre-loader we have no exception table and
* therefore no VBR to set
*/
#if !defined(CONFIG_MONITOR_IS_IN_RAM)
move.l #CONFIG_SYS_FLASH_BASE, %d0
movec %d0, %VBR
#endif
/* initialize general use internal ram */
move.l #0, %d0
move.l #(ICACHE_STATUS), %a1 /* icache */
move.l #(DCACHE_STATUS), %a2 /* dcache */
move.l %d0, (%a1)
move.l %d0, (%a2)
/*
* set stackpointer to internal sram end - 80
* (global data struct size + some bytes)
* get some stackspace for the first c-code,
*/
move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
clr.l %sp@-
/* put relocation table address to a5 */
move.l #__got_start, %a5
/* run low-level CPU init code (from flash) */
bsr cpu_init_f
/* run low-level board init code (from flash) */
bsr board_init_f
/* board_init_f() does not return */
/*--------------------------------------------------------------------------*/
/*
* void relocate_code (addr_sp, gd, addr_moni)
*
* This "function" does not return, instead it continues in RAM
* after relocating the monitor code.
*
*/
.globl relocate_code
relocate_code:
link.w %a6,#0
move.l 8(%a6), %sp /* set new stack pointer */
move.l 12(%a6), %d0 /* Save copy of Global Data pointer */
move.l 16(%a6), %a0 /* Save copy of Destination Address */
move.l #CONFIG_SYS_MONITOR_BASE, %a1
move.l #__init_end, %a2
move.l %a0, %a3
/* copy the code to RAM */
1:
move.l (%a1)+, (%a3)+
cmp.l %a1,%a2
bgt.s 1b
/*
* We are done. Do not return, instead branch to second part of board
* initialization, now running from RAM.
*/
move.l %a0, %a1
add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
jmp (%a1)
in_ram:
clear_bss:
/*
* Now clear BSS segment
*/
move.l %a0, %a1
add.l #(_sbss - CONFIG_SYS_MONITOR_BASE), %a1
move.l %a0, %d1
add.l #(_ebss - CONFIG_SYS_MONITOR_BASE), %d1
6:
clr.l (%a1)+
cmp.l %a1,%d1
bgt.s 6b
/*
* fix got table in RAM
*/
move.l %a0, %a1
add.l #(__got_start - CONFIG_SYS_MONITOR_BASE), %a1
/* * fix got pointer register a5 */
move.l %a1,%a5
move.l %a0, %a2
add.l #(__got_end - CONFIG_SYS_MONITOR_BASE), %a2
7:
move.l (%a1),%d1
sub.l #_start, %d1
add.l %a0,%d1
move.l %d1,(%a1)+
cmp.l %a2, %a1
bne 7b
/* calculate relative jump to board_init_r in ram */
move.l %a0, %a1
add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
/* set parameters for board_init_r */
move.l %a0,-(%sp) /* dest_addr */
move.l %d0,-(%sp) /* gd */
#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE!=CONFIG_SYS_INT_FLASH_BASE) && \
defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
halt
#endif
jsr (%a1)
/*--------------------------------------------------------------------------*/
/* exception code */
.globl _fault
_fault:
bra _fault
.globl _exc_handler
_exc_handler:
SAVE_ALL
movel %sp,%sp@-
bsr exc_handler
addql #4,%sp
RESTORE_ALL
.globl _int_handler
_int_handler:
SAVE_ALL
movel %sp,%sp@-
bsr int_handler
addql #4,%sp
RESTORE_ALL
/*--------------------------------------------------------------------------*/
.globl version_string
version_string:
.ascii U_BOOT_VERSION
.ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
.ascii CONFIG_IDENT_STRING, "\0"
.align 4
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