summaryrefslogtreecommitdiff
path: root/arch/m68k/cpu/mcf52x2/start.S
diff options
context:
space:
mode:
authorPeter Tyser <ptyser@xes-inc.com>2010-04-12 22:28:12 -0500
committerWolfgang Denk <wd@denx.de>2010-04-13 09:13:24 +0200
commita4145534851bf74619cb373a942613a74547bb82 (patch)
tree653ca8e04cad5da1eecac601b77f1f9b9cfd5fc5 /arch/m68k/cpu/mcf52x2/start.S
parent84ad688473bec2875e171b71040eb9e033c6c206 (diff)
downloadu-boot-imx-a4145534851bf74619cb373a942613a74547bb82.zip
u-boot-imx-a4145534851bf74619cb373a942613a74547bb82.tar.gz
u-boot-imx-a4145534851bf74619cb373a942613a74547bb82.tar.bz2
m68k: Move cpu/$CPU to arch/m68k/cpu/$CPU
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Diffstat (limited to 'arch/m68k/cpu/mcf52x2/start.S')
-rw-r--r--arch/m68k/cpu/mcf52x2/start.S335
1 files changed, 335 insertions, 0 deletions
diff --git a/arch/m68k/cpu/mcf52x2/start.S b/arch/m68k/cpu/mcf52x2/start.S
new file mode 100644
index 0000000..9ef206a
--- /dev/null
+++ b/arch/m68k/cpu/mcf52x2/start.S
@@ -0,0 +1,335 @@
+/*
+ * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de>
+ * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
+ *
+ * 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 <config.h>
+#include <timestamp.h>
+#include "version.h"
+#include <asm/cache.h>
+
+#ifndef CONFIG_IDENT_STRING
+#define CONFIG_IDENT_STRING ""
+#endif
+
+#define _START _start
+#define _FAULT _fault
+
+
+#define SAVE_ALL \
+ move.w #0x2700,%sr; /* disable intrs */ \
+ subl #60,%sp; /* space for 15 regs */ \
+ moveml %d0-%d7/%a0-%a6,%sp@; \
+
+#define RESTORE_ALL \
+ moveml %sp@,%d0-%d7/%a0-%a6; \
+ addl #60,%sp; /* space for 15 regs */ \
+ rte
+
+/* 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:
+
+.long 0x00000000 /* Flash offset is 0 until we setup CS0 */
+#if defined(CONFIG_M5282) && (TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
+.long _start - 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
+
+
+#if defined(CONFIG_SYS_INT_FLASH_BASE) && \
+ (defined(CONFIG_M5282) || defined(CONFIG_M5281))
+ #if (TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
+ .long 0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */
+ .long 0xFFFFFFFF /* all sectors protected */
+ .long 0x00000000 /* supervisor/User restriction */
+ .long 0x00000000 /* programm/data space restriction */
+ .long 0x00000000 /* Flash security */
+ #endif
+#endif
+ .globl _start
+_start:
+ nop
+ nop
+ move.w #0x2700,%sr
+
+#if defined(CONFIG_M5208)
+ /* Initialize RAMBAR: locate SRAM and validate it */
+ move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
+ movec %d0, %RAMBAR1
+#endif
+
+#if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5253)
+ move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set MBAR address + valid flag */
+ move.c %d0, %MBAR
+
+ /*** The 5249 has MBAR2 as well ***/
+#ifdef CONFIG_SYS_MBAR2
+ move.l #(CONFIG_SYS_MBAR2 + 1), %d0 /* Get MBAR2 address */
+ movec %d0, #0xc0e /* Set MBAR2 */
+#endif
+
+ move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
+ movec %d0, %RAMBAR0
+#endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */
+
+#if defined(CONFIG_M5282) || defined(CONFIG_M5271)
+ /* Initialize IPSBAR */
+ move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set IPSBAR address + valid flag */
+ move.l %d0, 0x40000000
+
+ /* Initialize RAMBAR1: locate SRAM and validate it */
+ move.l #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0
+ movec %d0, %RAMBAR1
+
+#if defined(CONFIG_M5282)
+#if (TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
+ /* Setup code in SRAM to initialize FLASHBAR, if start from internal Flash */
+
+ move.l #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0
+ move.l #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1
+ move.l #(CONFIG_SYS_INIT_RAM_ADDR), %a2
+_copy_flash:
+ move.l (%a0)+, (%a2)+
+ cmp.l %a0, %a1
+ bgt.s _copy_flash
+ jmp CONFIG_SYS_INIT_RAM_ADDR
+
+_flashbar_setup:
+ /* Initialize FLASHBAR: locate internal Flash and validate it */
+ move.l #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0
+ movec %d0, %FLASHBAR
+ jmp _after_flashbar_copy.L /* Force jump to absolute address */
+_flashbar_setup_end:
+ nop
+_after_flashbar_copy:
+#else
+ /* Setup code to initialize FLASHBAR, if start from external Memory */
+ move.l #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0
+ movec %d0, %FLASHBAR
+#endif /* (TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) */
+
+#endif
+#endif
+ /* 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)
+#if defined(CONFIG_M5282) && (TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
+ move.l #CONFIG_SYS_INT_FLASH_BASE, %d0
+#else
+ move.l #CONFIG_SYS_FLASH_BASE, %d0
+#endif
+ movec %d0, %VBR
+#endif
+
+#ifdef CONFIG_M5275
+ /* Initialize IPSBAR */
+ move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set IPSBAR address + valid flag */
+ move.l %d0, 0x40000000
+/* movec %d0, %MBAR */
+
+ /* Initialize RAMBAR: locate SRAM and validate it */
+ move.l #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0
+ movec %d0, %RAMBAR1
+#endif
+
+ /* initialize general use internal ram */
+ move.l #0, %d0
+ move.l #(ICACHE_STATUS), %a1 /* icache */
+ move.l #(DCACHE_STATUS), %a2 /* icache */
+ move.l %d0, (%a1)
+ move.l %d0, (%a2)
+
+ /* set stackpointer to end of internal ram to get some stackspace for the first c-code */
+ move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
+ clr.l %sp@-
+
+ move.l #__got_start, %a5 /* put relocation table address to a5 */
+
+ bsr cpu_init_f /* run low-level CPU init code (from flash) */
+ bsr board_init_f /* run low-level board init code (from flash) */
+
+ /* 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.
+ *
+ * r3 = dest
+ * r4 = src
+ * r5 = length in bytes
+ * r6 = cachelinesize
+ */
+ .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
+ move.l %a1,%a5 /* * fix got pointer register 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) && (TEXT_BASE != CONFIG_SYS_INT_FLASH_BASE) && \
+ defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
+ halt
+#endif
+ jsr (%a1)
+
+/*------------------------------------------------------------------------------*/
+/* exception code */
+ .globl _fault
+_fault:
+ jmp _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