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[people/ms/u-boot.git] / arch / m68k / cpu / mcf52x2 / start.S
CommitLineData
bf9e3b38
WD		 1/*
2 * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de>
3 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
25ddd1fb 24#include <asm-offsets.h>
bf9e3b38
WD		 25#include <config.h>
26#include "version.h"
dd9f054e 27#include <asm/cache.h>
bf9e3b38
WD		 28
29#ifndef CONFIG_IDENT_STRING
30#define CONFIG_IDENT_STRING ""
31#endif
32
bf9e3b38
WD		 33#define _START _start
34#define _FAULT _fault
35
36
37#define SAVE_ALL \
38 move.w #0x2700,%sr; /* disable intrs */ \
39 subl #60,%sp; /* space for 15 regs */ \
40 moveml %d0-%d7/%a0-%a6,%sp@; \
41
42#define RESTORE_ALL \
43 moveml %sp@,%d0-%d7/%a0-%a6; \
44 addl #60,%sp; /* space for 15 regs */ \
45 rte
46
47/* If we come from a pre-loader we don't need an initial exception
48 * table.
49 */
50#if !defined(CONFIG_MONITOR_IS_IN_RAM)
51
52.text
53/*
54 * Vector table. This is used for initial platform startup.
55 * These vectors are to catch any un-intended traps.
56 */
57_vectors:
58
4176c799 59.long 0x00000000 /* Flash offset is 0 until we setup CS0 */
14d0a02a
WD		 60#if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
61.long _start - CONFIG_SYS_TEXT_BASE
eacbd317 62#else
4176c799 63.long _START
eacbd317 64#endif
4176c799 65
bf9e3b38
WD		 66.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
67.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
68.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
69.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
70.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
71.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
72.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
73.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
74
75.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
76.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
77.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
78.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
79.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
80.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
81.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
82.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
83
84.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
85.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
86.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
87.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
88.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
89.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
90.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
91.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
92
93.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
94.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
95.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
96.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
97.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
98.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
99.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
100.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
101
102#endif
103
104 .text
105
9acb626f 106
6d0f6bcf 107#if defined(CONFIG_SYS_INT_FLASH_BASE) && \
9acb626f 108 (defined(CONFIG_M5282) || defined(CONFIG_M5281))
14d0a02a 109 #if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
9acb626f
HS		 110 .long 0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */
111 .long 0xFFFFFFFF /* all sectors protected */
112 .long 0x00000000 /* supervisor/User restriction */
113 .long 0x00000000 /* programm/data space restriction */
114 .long 0x00000000 /* Flash security */
115 #endif
116#endif
bf9e3b38
WD		 117 .globl _start
118_start:
119 nop
120 nop
121 move.w #0x2700,%sr
122
bf9a5215
TL		 123#if defined(CONFIG_M5208)
124 /* Initialize RAMBAR: locate SRAM and validate it */
125 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
126 movec %d0, %RAMBAR1
127#endif
128
a1436a84 129#if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5253)
6d0f6bcf 130 move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set MBAR address + valid flag */
bf9e3b38
WD		 131 move.c %d0, %MBAR
132
8c725b93 133 /*** The 5249 has MBAR2 as well ***/
6d0f6bcf
JCPV		 134#ifdef CONFIG_SYS_MBAR2
135 move.l #(CONFIG_SYS_MBAR2 + 1), %d0 /* Get MBAR2 address */
8c725b93
SR		 136 movec %d0, #0xc0e /* Set MBAR2 */
137#endif
138
6d0f6bcf 139 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
bf9e3b38 140 movec %d0, %RAMBAR0
a1436a84 141#endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */
bf9e3b38 142
4176c799 143#if defined(CONFIG_M5282) || defined(CONFIG_M5271)
bf9e3b38 144 /* Initialize IPSBAR */
6d0f6bcf 145 move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set IPSBAR address + valid flag */
bf9e3b38
WD		 146 move.l %d0, 0x40000000
147
9acb626f 148 /* Initialize RAMBAR1: locate SRAM and validate it */
6d0f6bcf 149 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0
9acb626f
HS		 150 movec %d0, %RAMBAR1
151
daa6e418 152#if defined(CONFIG_M5282)
14d0a02a 153#if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
9acb626f
HS		 154 /* Setup code in SRAM to initialize FLASHBAR, if start from internal Flash */
155
6d0f6bcf
JCPV		 156 move.l #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0
157 move.l #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1
158 move.l #(CONFIG_SYS_INIT_RAM_ADDR), %a2
9acb626f
HS		 159_copy_flash:
160 move.l (%a0)+, (%a2)+
161 cmp.l %a0, %a1
162 bgt.s _copy_flash
6d0f6bcf 163 jmp CONFIG_SYS_INIT_RAM_ADDR
9acb626f
HS		 164
165_flashbar_setup:
bf9e3b38 166 /* Initialize FLASHBAR: locate internal Flash and validate it */
6d0f6bcf 167 move.l #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0
43d60642 168 movec %d0, %FLASHBAR
9acb626f
HS		 169 jmp _after_flashbar_copy.L /* Force jump to absolute address */
170_flashbar_setup_end:
171 nop
172_after_flashbar_copy:
173#else
174 /* Setup code to initialize FLASHBAR, if start from external Memory */
6d0f6bcf 175 move.l #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0
4cb4e654 176 movec %d0, %FLASHBAR
14d0a02a 177#endif /* (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) */
bf9e3b38 178
6741ae92 179#endif
9acb626f
HS		 180#endif
181 /* if we come from a pre-loader we have no exception table and
182 * therefore no VBR to set
183 */
184#if !defined(CONFIG_MONITOR_IS_IN_RAM)
14d0a02a 185#if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
6d0f6bcf 186 move.l #CONFIG_SYS_INT_FLASH_BASE, %d0
2acefa72 187#else
6d0f6bcf 188 move.l #CONFIG_SYS_FLASH_BASE, %d0
2acefa72 189#endif
9acb626f 190 movec %d0, %VBR
6f5155a9
MB		 191#endif
192
f71d9d91
MF		 193#ifdef CONFIG_M5275
194 /* Initialize IPSBAR */
6d0f6bcf 195 move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set IPSBAR address + valid flag */
f71d9d91
MF		 196 move.l %d0, 0x40000000
197/* movec %d0, %MBAR */
198
199 /* Initialize RAMBAR: locate SRAM and validate it */
6d0f6bcf 200 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0
f71d9d91
MF		 201 movec %d0, %RAMBAR1
202#endif
203
dd9f054e
TL		 204 /* initialize general use internal ram */
205 move.l #0, %d0
206 move.l #(ICACHE_STATUS), %a1 /* icache */
207 move.l #(DCACHE_STATUS), %a2 /* icache */
208 move.l %d0, (%a1)
209 move.l %d0, (%a2)
210
bf9e3b38 211 /* set stackpointer to end of internal ram to get some stackspace for the first c-code */
6d0f6bcf 212 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
bf9e3b38
WD		 213 clr.l %sp@-
214
215 move.l #__got_start, %a5 /* put relocation table address to a5 */
216
217 bsr cpu_init_f /* run low-level CPU init code (from flash) */
218 bsr board_init_f /* run low-level board init code (from flash) */
219
6f5155a9 220 /* board_init_f() does not return */
bf9e3b38
WD		 221
222/*------------------------------------------------------------------------------*/
223
224/*
225 * void relocate_code (addr_sp, gd, addr_moni)
226 *
227 * This "function" does not return, instead it continues in RAM
228 * after relocating the monitor code.
229 *
230 * r3 = dest
231 * r4 = src
232 * r5 = length in bytes
233 * r6 = cachelinesize
234 */
235 .globl relocate_code
236relocate_code:
237 link.w %a6,#0
238 move.l 8(%a6), %sp /* set new stack pointer */
239
240 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */
241 move.l 16(%a6), %a0 /* Save copy of Destination Address */
242
6d0f6bcf 243 move.l #CONFIG_SYS_MONITOR_BASE, %a1
bf9e3b38
WD		 244 move.l #__init_end, %a2
245 move.l %a0, %a3
bf9e3b38
WD		 246 /* copy the code to RAM */
2471:
248 move.l (%a1)+, (%a3)+
249 cmp.l %a1,%a2
250 bgt.s 1b
251
252/*
253 * We are done. Do not return, instead branch to second part of board
254 * initialization, now running from RAM.
255 */
53677ef1 256 move.l %a0, %a1
6d0f6bcf 257 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
bf9e3b38
WD		 258 jmp (%a1)
259
260in_ram:
261
262clear_bss:
53677ef1 263 /*
bf9e3b38
WD		 264 * Now clear BSS segment
265 */
266 move.l %a0, %a1
6d0f6bcf 267 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
bf9e3b38 268 move.l %a0, %d1
6d0f6bcf 269 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
bf9e3b38
WD		 2706:
271 clr.l (%a1)+
272 cmp.l %a1,%d1
273 bgt.s 6b
274
275 /*
276 * fix got table in RAM
277 */
278 move.l %a0, %a1
6d0f6bcf 279 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
bf9e3b38
WD		 280 move.l %a1,%a5 /* * fix got pointer register a5 */
281
282 move.l %a0, %a2
6d0f6bcf 283 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
bf9e3b38
WD		 284
2857:
286 move.l (%a1),%d1
287 sub.l #_start,%d1
288 add.l %a0,%d1
289 move.l %d1,(%a1)+
290 cmp.l %a2, %a1
291 bne 7b
292
293 /* calculate relative jump to board_init_r in ram */
294 move.l %a0, %a1
6d0f6bcf 295 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
bf9e3b38
WD		 296
297 /* set parameters for board_init_r */
298 move.l %a0,-(%sp) /* dest_addr */
299 move.l %d0,-(%sp) /* gd */
14d0a02a 300#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE != CONFIG_SYS_INT_FLASH_BASE) && \
6d0f6bcf 301 defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
83ec20bc
TL		 302 halt
303#endif
bf9e3b38
WD		 304 jsr (%a1)
305
306/*------------------------------------------------------------------------------*/
307/* exception code */
308 .globl _fault
309_fault:
37d6cc31 310 bra _fault
bf9e3b38
WD		 311
312 .globl _exc_handler
313_exc_handler:
314 SAVE_ALL
315 movel %sp,%sp@-
316 bsr exc_handler
317 addql #4,%sp
318 RESTORE_ALL
319
320 .globl _int_handler
321_int_handler:
322 SAVE_ALL
323 movel %sp,%sp@-
324 bsr int_handler
325 addql #4,%sp
326 RESTORE_ALL
327
bf9e3b38
WD		 328/*------------------------------------------------------------------------------*/
329
330 .globl version_string
331version_string:
09c2e90c 332 .ascii U_BOOT_VERSION_STRING, "\0"
9b46432f 333 .align 4
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