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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / bf9e3b38f77c2eac620263dd60437c6ec47a27bf / . / cpu / mcf52x2 / start.S
blob: cf1b97d84c06400602e4510f54629ac646feac03 [file] [log] [blame]
wdenkbf9e3b32004-02-12 00:47:09 +0000[diff] [blame^]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
24#include <config.h>
25#include "version.h"
26
27#ifndef CONFIG_IDENT_STRING
28#define CONFIG_IDENT_STRING ""
29#endif
30
31
32#define _START _start
33#define _FAULT _fault
34
35
36#define SAVE_ALL \
37 move.w #0x2700,%sr; /* disable intrs */ \
38 subl #60,%sp; /* space for 15 regs */ \
39 moveml %d0-%d7/%a0-%a6,%sp@; \
40
41#define RESTORE_ALL \
42 moveml %sp@,%d0-%d7/%a0-%a6; \
43 addl #60,%sp; /* space for 15 regs */ \
44 rte
45
46/* If we come from a pre-loader we don't need an initial exception
47 * table.
48 */
49#if !defined(CONFIG_MONITOR_IS_IN_RAM)
50
51.text
52/*
53 * Vector table. This is used for initial platform startup.
54 * These vectors are to catch any un-intended traps.
55 */
56_vectors:
57
58.long 0x00000000, _START
59.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
60.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
61.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
62.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
63.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
64.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
65.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
66.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
67
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, _FAULT, _FAULT
74.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
75.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
76
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
84.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
85
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
93.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
94
95#endif
96
97 .text
98
99 .globl _start
100_start:
101 nop
102 nop
103 move.w #0x2700,%sr
104
105 /* if we come from a pre-loader we have no exception table and
106 * therefore no VBR to set
107 */
108#if !defined(CONFIG_MONITOR_IS_IN_RAM)
109 move.l #CFG_FLASH_BASE, %d0
110 movec %d0, %VBR
111#endif
112
113#ifdef CONFIG_M5272
114 move.l #(CFG_MBAR + 1), %d0 /* set MBAR address + valid flag */
115 move.c %d0, %MBAR
116
117 move.l #(CFG_INIT_RAM_ADDR + 1), %d0
118 movec %d0, %RAMBAR0
119#endif
120
121#ifdef CONFIG_M5282
122 /* Initialize IPSBAR */
123 move.l #(CFG_MBAR + 1), %d0 /* set IPSBAR address + valid flag */
124 move.l %d0, 0x40000000
125
126 /* Initialize FLASHBAR: locate internal Flash and validate it */
127 move.l #(CFG_INT_FLASH_BASE + 0x21), %d0
128 movec %d0, %RAMBAR0
129
130 /* Initialize RAMBAR1: locate SRAM and validate it */
131 move.l #(CFG_INIT_RAM_ADDR + 0x21), %d0
132 movec %d0, %RAMBAR1
133#endif
134
135 /* invalidate and disable cache */
136 move.l #0x01000000, %d0 /* Invalidate cache cmd */
137 movec %d0, %CACR /* Invalidate cache */
138 move.l #0, %d0
139 movec %d0, %ACR0
140 movec %d0, %ACR1
141
142 /* set stackpointer to end of internal ram to get some stackspace for the first c-code */
143 move.l #(CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET), %sp
144 clr.l %sp@-
145
146 move.l #__got_start, %a5 /* put relocation table address to a5 */
147
148 bsr cpu_init_f /* run low-level CPU init code (from flash) */
149 bsr board_init_f /* run low-level board init code (from flash) */
150
151 /* board_init_f() does not return
152
153/*------------------------------------------------------------------------------*/
154
155/*
156 * void relocate_code (addr_sp, gd, addr_moni)
157 *
158 * This "function" does not return, instead it continues in RAM
159 * after relocating the monitor code.
160 *
161 * r3 = dest
162 * r4 = src
163 * r5 = length in bytes
164 * r6 = cachelinesize
165 */
166 .globl relocate_code
167relocate_code:
168 link.w %a6,#0
169 move.l 8(%a6), %sp /* set new stack pointer */
170
171 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */
172 move.l 16(%a6), %a0 /* Save copy of Destination Address */
173
174 move.l #CFG_MONITOR_BASE, %a1
175 move.l #__init_end, %a2
176 move.l %a0, %a3
177
178 /* copy the code to RAM */
1791:
180 move.l (%a1)+, (%a3)+
181 cmp.l %a1,%a2
182 bgt.s 1b
183
184/*
185 * We are done. Do not return, instead branch to second part of board
186 * initialization, now running from RAM.
187 */
188 move.l %a0, %a1
189 add.l #(in_ram - CFG_MONITOR_BASE), %a1
190 jmp (%a1)
191
192in_ram:
193
194clear_bss:
195 /*
196 * Now clear BSS segment
197 */
198 move.l %a0, %a1
199 add.l #(_sbss - CFG_MONITOR_BASE),%a1
200 move.l %a0, %d1
201 add.l #(_ebss - CFG_MONITOR_BASE),%d1
2026:
203 clr.l (%a1)+
204 cmp.l %a1,%d1
205 bgt.s 6b
206
207 /*
208 * fix got table in RAM
209 */
210 move.l %a0, %a1
211 add.l #(__got_start - CFG_MONITOR_BASE),%a1
212 move.l %a1,%a5 /* * fix got pointer register a5 */
213
214 move.l %a0, %a2
215 add.l #(__got_end - CFG_MONITOR_BASE),%a2
216
2177:
218 move.l (%a1),%d1
219 sub.l #_start,%d1
220 add.l %a0,%d1
221 move.l %d1,(%a1)+
222 cmp.l %a2, %a1
223 bne 7b
224
225 /* calculate relative jump to board_init_r in ram */
226 move.l %a0, %a1
227 add.l #(board_init_r - CFG_MONITOR_BASE), %a1
228
229 /* set parameters for board_init_r */
230 move.l %a0,-(%sp) /* dest_addr */
231 move.l %d0,-(%sp) /* gd */
232 jsr (%a1)
233
234/*------------------------------------------------------------------------------*/
235/* exception code */
236 .globl _fault
237_fault:
238 jmp _fault
239
240 .globl _exc_handler
241_exc_handler:
242 SAVE_ALL
243 movel %sp,%sp@-
244 bsr exc_handler
245 addql #4,%sp
246 RESTORE_ALL
247
248 .globl _int_handler
249_int_handler:
250 SAVE_ALL
251 movel %sp,%sp@-
252 bsr int_handler
253 addql #4,%sp
254 RESTORE_ALL
255
256/*------------------------------------------------------------------------------*/
257/* cache functions */
258#ifdef CONFIG_M5272
259 .globl icache_enable
260icache_enable:
261 move.l #0x01000000, %d0 /* Invalidate cache cmd */
262 movec %d0, %CACR /* Invalidate cache */
263 move.l #0x0000c000, %d0 /* Setup cache mask */
264 movec %d0, %ACR0 /* Enable cache */
265 move.l #0xff00c000, %d0 /* Setup cache mask */
266 movec %d0, %ACR1 /* Enable cache */
267 move.l #0x80000100, %d0 /* Setup cache mask */
268 movec %d0, %CACR /* Enable cache */
269 moveq #1, %d0
270 move.l %d0, icache_state
271 rts
272#endif
273
274#ifdef CONFIG_M5282
275 .globl icache_enable
276icache_enable:
277 move.l #0x01000000, %d0 /* Invalidate cache cmd */
278 movec %d0, %CACR /* Invalidate cache */
279 move.l #0x0000c000, %d0 /* Setup cache mask */
280 movec %d0, %ACR0 /* Enable cache */
281 move.l #0xff00c000, %d0 /* Setup cache mask */
282 movec %d0, %ACR1 /* Enable cache */
283 move.l #0x80400100, %d0 /* Setup cache mask, data cache disabel*/
284 movec %d0, %CACR /* Enable cache */
285 moveq #1, %d0
286 move.l %d0, icache_state
287 rts
288#endif
289
290 .globl icache_disable
291icache_disable:
292 move.l #0x00000100, %d0 /* Setup cache mask */
293 movec %d0, %CACR /* Enable cache */
294 clr.l %d0 /* Setup cache mask */
295 movec %d0, %ACR0 /* Enable cache */
296 movec %d0, %ACR1 /* Enable cache */
297 moveq #0, %d0
298 move.l %d0, icache_state
299 rts
300
301 .globl icache_status
302icache_status:
303 move.l icache_state, %d0
304 rts
305
306 .data
307icache_state:
308 .long 1
309
310/*------------------------------------------------------------------------------*/
311
312 .globl version_string
313version_string:
314 .ascii U_BOOT_VERSION
315 .ascii " (", __DATE__, " - ", __TIME__, ")"
316 .ascii CONFIG_IDENT_STRING, "\0"