xref: /openbmc/u-boot/arch/m68k/cpu/mcf5445x/start.S (revision ed56fb1d) 
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 <timestamp.h>
26#include "version.h"
27#include <asm/cache.h>
28
29#ifndef	 CONFIG_IDENT_STRING
30#define	 CONFIG_IDENT_STRING ""
31#endif
32
33#define _START	_start
34#define _FAULT	_fault
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 defined(CONFIG_CF_SBF)
47#define ASM_DRAMINIT	(asm_dram_init - TEXT_BASE + CONFIG_SYS_INIT_RAM_ADDR)
48#define ASM_SBF_IMG_HDR	(asm_sbf_img_hdr - TEXT_BASE + CONFIG_SYS_INIT_RAM_ADDR)
49#endif
50
51.text
52
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#if defined(CONFIG_CF_SBF)
59
60INITSP:	.long	0		/* Initial SP	*/
61INITPC:	.long	ASM_DRAMINIT	/* Initial PC 	*/
62
63#else
64
65INITSP:		.long	0	/* Initial SP	*/
66INITPC:		.long	_START	/* Initial PC 		*/
67
68#endif
69
70vector02:	.long	_FAULT	/* Access Error		*/
71vector03:	.long	_FAULT	/* Address Error	*/
72vector04:	.long	_FAULT	/* Illegal Instruction	*/
73vector05:	.long	_FAULT	/* Reserved		*/
74vector06:	.long	_FAULT	/* Reserved		*/
75vector07:	.long	_FAULT	/* Reserved		*/
76vector08:	.long	_FAULT	/* Privilege Violation	*/
77vector09:	.long	_FAULT	/* Trace		*/
78vector0A:	.long	_FAULT	/* Unimplemented A-Line	*/
79vector0B:	.long	_FAULT	/* Unimplemented F-Line	*/
80vector0C:	.long	_FAULT	/* Debug Interrupt	*/
81vector0D:	.long	_FAULT	/* Reserved		*/
82vector0E:	.long	_FAULT	/* Format Error		*/
83vector0F:	.long	_FAULT	/* Unitialized Int.	*/
84
85/* Reserved */
86vector10_17:
87.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
88
89vector18:	.long	_FAULT	/* Spurious Interrupt	*/
90vector19:	.long	_FAULT	/* Autovector Level 1	*/
91vector1A:	.long	_FAULT	/* Autovector Level 2	*/
92vector1B:	.long	_FAULT	/* Autovector Level 3	*/
93vector1C:	.long	_FAULT	/* Autovector Level 4	*/
94vector1D:	.long	_FAULT	/* Autovector Level 5	*/
95vector1E:	.long	_FAULT	/* Autovector Level 6	*/
96vector1F:	.long	_FAULT	/* Autovector Level 7	*/
97
98#if !defined(CONFIG_CF_SBF)
99
100/* TRAP #0 - #15 */
101vector20_2F:
102.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
103.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
104
105/* Reserved	*/
106vector30_3F:
107.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
108.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
109
110vector64_127:
111.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
112.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
113.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
114.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
115.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
116.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
117.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
118.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
119
120vector128_191:
121.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
122.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
123.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
124.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
125.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
126.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
127.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
128.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
129
130vector192_255:
131.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
132.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
133.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
134.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
135.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
136.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
137.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
138.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
139#endif
140
141#if defined(CONFIG_CF_SBF)
142	/* Image header: chksum 4 bytes, len 4 bytes, img dest 4 bytes */
143asm_sbf_img_hdr:
144	.long	0x00000000	/* checksum, not yet implemented */
145	.long	0x00030000	/* image length */
146	.long	TEXT_BASE	/* image to be relocated at */
147
148asm_dram_init:
149	move.w #0x2700,%sr		/* Mask off Interrupt */
150
151	move.l	#CONFIG_SYS_INIT_RAM_ADDR, %d0
152	movec	%d0, %VBR
153
154	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
155	movec	%d0, %RAMBAR1
156
157	/* initialize general use internal ram */
158	move.l #0, %d0
159	move.l #(ICACHE_STATUS), %a1	/* icache */
160	move.l #(DCACHE_STATUS), %a2	/* dcache */
161	move.l %d0, (%a1)
162	move.l %d0, (%a2)
163
164	/* invalidate and disable cache */
165	move.l	#(CONFIG_SYS_ICACHE_INV + CONFIG_SYS_DCACHE_INV), %d0
166	movec	%d0, %CACR		/* Invalidate cache */
167	move.l	#0, %d0
168	movec	%d0, %ACR0
169	movec	%d0, %ACR1
170	movec	%d0, %ACR2
171	movec	%d0, %ACR3
172
173	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
174	clr.l %sp@-
175
176	/* Must disable global address */
177	move.l	#0xFC008000, %a1
178	move.l	#(CONFIG_SYS_CS0_BASE), (%a1)
179	move.l	#0xFC008008, %a1
180	move.l	#(CONFIG_SYS_CS0_CTRL), (%a1)
181	move.l	#0xFC008004, %a1
182	move.l	#(CONFIG_SYS_CS0_MASK), (%a1)
183
184	/* Dram Initialization a1, a2, and d0 */
185	/* mscr sdram */
186	move.l	#0xFC0A4074, %a1
187	move.b	#(CONFIG_SYS_SDRAM_DRV_STRENGTH), (%a1)
188	nop
189
190	/* SDRAM Chip 0 and 1 */
191	move.l	#0xFC0B8110, %a1
192	move.l	#0xFC0B8114, %a2
193
194	/* calculate the size */
195	move.l	#0x13, %d1
196	move.l	#(CONFIG_SYS_SDRAM_SIZE), %d2
197#ifdef CONFIG_SYS_SDRAM_BASE1
198	lsr.l	#1, %d2
199#endif
200
201dramsz_loop:
202	lsr.l	#1, %d2
203	add.l	#1, %d1
204	cmp.l	#1, %d2
205	bne	dramsz_loop
206
207	/* SDRAM Chip 0 and 1 */
208	move.l	#(CONFIG_SYS_SDRAM_BASE), (%a1)
209	or.l	%d1, (%a1)
210#ifdef CONFIG_SYS_SDRAM_BASE1
211	move.l	#(CONFIG_SYS_SDRAM_BASE1), (%a2)
212	or.l	%d1, (%a2)
213#endif
214	nop
215
216	/* dram cfg1 and cfg2 */
217	move.l	#0xFC0B8008, %a1
218	move.l	#(CONFIG_SYS_SDRAM_CFG1), (%a1)
219	nop
220	move.l	#0xFC0B800C, %a2
221	move.l	#(CONFIG_SYS_SDRAM_CFG2), (%a2)
222	nop
223
224	move.l	#0xFC0B8000, %a1	/* Mode */
225	move.l	#0xFC0B8004, %a2	/* Ctrl */
226
227	/* Issue PALL */
228	move.l	#(CONFIG_SYS_SDRAM_CTRL + 2), (%a2)
229	nop
230
231#ifdef CONFIG_M54455EVB
232	/* Issue LEMR */
233	move.l	#(CONFIG_SYS_SDRAM_EMOD + 0x408), (%a1)
234	nop
235	move.l	#(CONFIG_SYS_SDRAM_MODE + 0x300), (%a1)
236	nop
237#endif
238
239	move.l	#1000, %d1
240	jsr	asm_delay
241
242	/* Issue PALL */
243	move.l	#(CONFIG_SYS_SDRAM_CTRL + 2), (%a2)
244	nop
245
246	/* Perform two refresh cycles */
247	move.l	#(CONFIG_SYS_SDRAM_CTRL + 4), %d0
248	nop
249	move.l	%d0, (%a2)
250	move.l	%d0, (%a2)
251	nop
252
253#ifdef CONFIG_M54455EVB
254	move.l	#(CONFIG_SYS_SDRAM_MODE + 0x200), (%a1)
255	nop
256#elif defined(CONFIG_M54451EVB)
257	/* Issue LEMR */
258	move.l	#(CONFIG_SYS_SDRAM_MODE), (%a1)
259	nop
260	move.l	#(CONFIG_SYS_SDRAM_EMOD), (%a1)
261#endif
262
263	move.l	#500, %d1
264	jsr	asm_delay
265
266	move.l	#(CONFIG_SYS_SDRAM_CTRL), %d1
267	and.l	#0x7FFFFFFF, %d1
268#ifdef CONFIG_M54455EVB
269	or.l	#0x10000C00, %d1
270#elif defined(CONFIG_M54451EVB)
271	or.l	#0x10000C00, %d1
272#endif
273	move.l	%d1, (%a2)
274	nop
275
276	move.l	#2000, %d1
277	jsr	asm_delay
278
279	/*
280	 * DSPI Initialization
281	 * a0 - general, sram - 0x80008000 - 32, see M54455EVB.h
282	 * a1 - dspi status
283	 * a2 - dtfr
284	 * a3 - drfr
285	 * a4 - Dst addr
286	 */
287	/* Enable pins for DSPI mode - chip-selects are enabled later */
288asm_dspi_init:
289	move.l	#0xFC0A4063, %a0
290	move.b	#0x7F, (%a0)
291
292	/* Configure DSPI module */
293	move.l	#0xFC05C000, %a0
294	move.l	#0x80FF0C00, (%a0)	/* Master, clear TX/RX FIFO */
295
296	move.l	#0xFC05C00C, %a0
297	move.l	#0x3E000011, (%a0)
298
299	move.l	#0xFC05C034, %a2	/* dtfr */
300	move.l	#0xFC05C03B, %a3	/* drfr */
301
302	move.l	#(ASM_SBF_IMG_HDR + 4), %a1
303	move.l	(%a1)+, %d5
304	move.l	(%a1), %a4
305
306	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_SBFHDR_DATA_OFFSET), %a0
307	move.l	#(CONFIG_SYS_SBFHDR_SIZE), %d4
308
309	move.l	#0xFC05C02C, %a1	/* dspi status */
310
311	/* Issue commands and address */
312	move.l	#0x8002000B, %d2	/* Fast Read Cmd */
313	jsr	asm_dspi_wr_status
314	jsr	asm_dspi_rd_status
315
316	move.l	#0x80020000, %d2	/* Address byte 2 */
317	jsr	asm_dspi_wr_status
318	jsr	asm_dspi_rd_status
319
320	move.l	#0x80020000, %d2	/* Address byte 1 */
321	jsr	asm_dspi_wr_status
322	jsr	asm_dspi_rd_status
323
324	move.l	#0x80020000, %d2	/* Address byte 0 */
325	jsr	asm_dspi_wr_status
326	jsr	asm_dspi_rd_status
327
328	move.l	#0x80020000, %d2	/* Dummy Wr and Rd */
329	jsr	asm_dspi_wr_status
330	jsr	asm_dspi_rd_status
331
332	/* Transfer serial boot header to sram */
333asm_dspi_rd_loop1:
334	move.l	#0x80020000, %d2
335	jsr	asm_dspi_wr_status
336	jsr	asm_dspi_rd_status
337
338	move.b	%d1, (%a0)		/* read, copy to dst */
339
340	add.l	#1, %a0			/* inc dst by 1 */
341	sub.l	#1, %d4			/* dec cnt by 1 */
342	bne	asm_dspi_rd_loop1
343
344	/* Transfer u-boot from serial flash to memory */
345asm_dspi_rd_loop2:
346	move.l	#0x80020000, %d2
347	jsr	asm_dspi_wr_status
348	jsr	asm_dspi_rd_status
349
350	move.b	%d1, (%a4)		/* read, copy to dst */
351
352	add.l	#1, %a4			/* inc dst by 1 */
353	sub.l	#1, %d5			/* dec cnt by 1 */
354	bne	asm_dspi_rd_loop2
355
356	move.l	#0x00020000, %d2	/* Terminate */
357	jsr	asm_dspi_wr_status
358	jsr	asm_dspi_rd_status
359
360	/* jump to memory and execute */
361	move.l	#(TEXT_BASE + 0x400), %a0
362	jmp	(%a0)
363
364asm_dspi_wr_status:
365	move.l	(%a1), %d0		/* status */
366	and.l	#0x0000F000, %d0
367	cmp.l	#0x00003000, %d0
368	bgt	asm_dspi_wr_status
369
370	move.l	%d2, (%a2)
371	rts
372
373asm_dspi_rd_status:
374	move.l	(%a1), %d0		/* status */
375	and.l	#0x000000F0, %d0
376	lsr.l	#4, %d0
377	cmp.l	#0, %d0
378	beq	asm_dspi_rd_status
379
380	move.b	(%a3), %d1
381	rts
382
383asm_delay:
384	nop
385	subq.l	#1, %d1
386	bne	asm_delay
387	rts
388#endif			/* CONFIG_CF_SBF */
389
390	.text
391	. = 0x400
392	.globl	_start
393_start:
394#if !defined(CONFIG_CF_SBF)
395	nop
396	nop
397	move.w #0x2700,%sr		/* Mask off Interrupt */
398
399	/* Set vector base register at the beginning of the Flash */
400	move.l	#CONFIG_SYS_FLASH_BASE, %d0
401	movec	%d0, %VBR
402
403	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
404	movec	%d0, %RAMBAR1
405
406	/* initialize general use internal ram */
407	move.l #0, %d0
408	move.l #(ICACHE_STATUS), %a1	/* icache */
409	move.l #(DCACHE_STATUS), %a2	/* dcache */
410	move.l %d0, (%a1)
411	move.l %d0, (%a2)
412
413	/* invalidate and disable cache */
414	move.l	#(CONFIG_SYS_ICACHE_INV + CONFIG_SYS_DCACHE_INV), %d0
415	movec	%d0, %CACR		/* Invalidate cache */
416	move.l	#0, %d0
417	movec	%d0, %ACR0
418	movec	%d0, %ACR1
419	movec	%d0, %ACR2
420	movec	%d0, %ACR3
421
422	/* set stackpointer to end of internal ram to get some stackspace for
423	   the first c-code */
424	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
425	clr.l %sp@-
426#endif
427
428	move.l #__got_start, %a5	/* put relocation table address to a5 */
429
430	bsr cpu_init_f			/* run low-level CPU init code (from flash) */
431	bsr board_init_f		/* run low-level board init code (from flash) */
432
433	/* board_init_f() does not return */
434
435/*------------------------------------------------------------------------------*/
436
437/*
438 * void relocate_code (addr_sp, gd, addr_moni)
439 *
440 * This "function" does not return, instead it continues in RAM
441 * after relocating the monitor code.
442 *
443 * r3 = dest
444 * r4 = src
445 * r5 = length in bytes
446 * r6 = cachelinesize
447 */
448	.globl	relocate_code
449relocate_code:
450	link.w %a6,#0
451	move.l 8(%a6), %sp		/* set new stack pointer */
452
453	move.l 12(%a6), %d0		/* Save copy of Global Data pointer */
454	move.l 16(%a6), %a0		/* Save copy of Destination Address */
455
456	move.l #CONFIG_SYS_MONITOR_BASE, %a1
457	move.l #__init_end, %a2
458	move.l %a0, %a3
459
460	/* copy the code to RAM */
4611:
462	move.l (%a1)+, (%a3)+
463	cmp.l  %a1,%a2
464	bgt.s	 1b
465
466/*
467 * We are done. Do not return, instead branch to second part of board
468 * initialization, now running from RAM.
469 */
470	move.l	%a0, %a1
471	add.l	#(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
472	jmp	(%a1)
473
474in_ram:
475
476clear_bss:
477	/*
478	 * Now clear BSS segment
479	 */
480	move.l	%a0, %a1
481	add.l	#(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
482	move.l	%a0, %d1
483	add.l	#(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
4846:
485	clr.l	(%a1)+
486	cmp.l	%a1,%d1
487	bgt.s	6b
488
489	/*
490	 * fix got table in RAM
491	 */
492	move.l	%a0, %a1
493	add.l	#(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
494	move.l	%a1,%a5			/* * fix got pointer register a5 */
495
496	move.l	%a0, %a2
497	add.l	#(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
498
4997:
500	move.l	(%a1),%d1
501	sub.l	#_start,%d1
502	add.l	%a0,%d1
503	move.l	%d1,(%a1)+
504	cmp.l	%a2, %a1
505	bne	7b
506
507	/* calculate relative jump to board_init_r in ram */
508	move.l %a0, %a1
509	add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
510
511	/* set parameters for board_init_r */
512	move.l %a0,-(%sp)		/* dest_addr */
513	move.l %d0,-(%sp)		/* gd */
514	jsr	(%a1)
515
516/*------------------------------------------------------------------------------*/
517/* exception code */
518	.globl _fault
519_fault:
520	bra _fault
521	.globl	_exc_handler
522
523_exc_handler:
524	SAVE_ALL
525	movel	%sp,%sp@-
526	bsr exc_handler
527	addql	#4,%sp
528	RESTORE_ALL
529
530	.globl	_int_handler
531_int_handler:
532	SAVE_ALL
533	movel	%sp,%sp@-
534	bsr int_handler
535	addql	#4,%sp
536	RESTORE_ALL
537
538/*------------------------------------------------------------------------------*/
539
540	.globl	version_string
541version_string:
542	.ascii U_BOOT_VERSION
543	.ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
544	.ascii CONFIG_IDENT_STRING, "\0"
545	.align 4
546