xref: /openbmc/u-boot/arch/m68k/cpu/mcf5227x/start.S (revision c6af2e7d) 
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 <asm-offsets.h>
25#include <config.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 - CONFIG_SYS_TEXT_BASE + CONFIG_SYS_INIT_RAM_ADDR)
48#define ASM_SBF_IMG_HDR	(asm_sbf_img_hdr - CONFIG_SYS_TEXT_BASE + CONFIG_SYS_INIT_RAM_ADDR)
49#endif
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#if defined(CONFIG_CF_SBF)
59INITSP:		.long	0		/* Initial SP	*/
60INITPC:		.long	ASM_DRAMINIT	/* Initial PC 	*/
61#else
62INITSP:		.long	0	/* Initial SP	*/
63INITPC:		.long	_START	/* Initial PC 		*/
64#endif
65
66vector02:	.long	_FAULT	/* Access Error		*/
67vector03:	.long	_FAULT	/* Address Error	*/
68vector04:	.long	_FAULT	/* Illegal Instruction	*/
69vector05:	.long	_FAULT	/* Reserved		*/
70vector06:	.long	_FAULT	/* Reserved		*/
71vector07:	.long	_FAULT	/* Reserved		*/
72vector08:	.long	_FAULT	/* Privilege Violation	*/
73vector09:	.long	_FAULT	/* Trace		*/
74vector0A:	.long	_FAULT	/* Unimplemented A-Line	*/
75vector0B:	.long	_FAULT	/* Unimplemented F-Line	*/
76vector0C:	.long	_FAULT	/* Debug Interrupt	*/
77vector0D:	.long	_FAULT	/* Reserved		*/
78vector0E:	.long	_FAULT	/* Format Error		*/
79vector0F:	.long	_FAULT	/* Unitialized Int.	*/
80
81/* Reserved */
82vector10_17:
83.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
84
85vector18:	.long	_FAULT	/* Spurious Interrupt	*/
86vector19:	.long	_FAULT	/* Autovector Level 1	*/
87vector1A:	.long	_FAULT	/* Autovector Level 2	*/
88vector1B:	.long	_FAULT	/* Autovector Level 3	*/
89vector1C:	.long	_FAULT	/* Autovector Level 4	*/
90vector1D:	.long	_FAULT	/* Autovector Level 5	*/
91vector1E:	.long	_FAULT	/* Autovector Level 6	*/
92vector1F:	.long	_FAULT	/* Autovector Level 7	*/
93
94#if !defined(CONFIG_CF_SBF)
95/* TRAP #0 - #15 */
96vector20_2F:
97.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
98.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
99
100/* Reserved	*/
101vector30_3F:
102.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
103.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
104
105vector64_127:
106.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
107.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
108.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
109.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
110.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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
115vector128_191:
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.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
120.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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
125vector192_255:
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.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
130.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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#endif
135
136#if defined(CONFIG_CF_SBF)
137	/* Image header: chksum 4 bytes, len 4 bytes, img dest 4 bytes */
138asm_sbf_img_hdr:
139	.long	0x00000000	/* checksum, not yet implemented */
140	.long	0x00020000	/* image length */
141	.long	CONFIG_SYS_TEXT_BASE	/* image to be relocated at */
142
143asm_dram_init:
144	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
145	movec	%d0, %RAMBAR1	/* init Rambar */
146	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
147	clr.l %sp@-
148
149	/* Must disable global address */
150	move.l	#0xFC008000, %a1
151	move.l	#(CONFIG_SYS_CS0_BASE), (%a1)
152	move.l	#0xFC008008, %a1
153	move.l	#(CONFIG_SYS_CS0_CTRL), (%a1)
154	move.l	#0xFC008004, %a1
155	move.l	#(CONFIG_SYS_CS0_MASK), (%a1)
156
157	/*
158	 * Dram Initialization
159	 * a1, a2, and d0
160	 */
161	/* mscr sdram */
162	move.l	#0xFC0A4074, %a1
163	move.b	#(CONFIG_SYS_SDRAM_DRV_STRENGTH), (%a1)
164	nop
165
166	/* SDRAM Chip 0 and 1 */
167	move.l	#0xFC0B8110, %a1
168	move.l	#0xFC0B8114, %a2
169
170	/* calculate the size */
171	move.l	#0x13, %d1
172	move.l	#(CONFIG_SYS_SDRAM_SIZE), %d2
173#ifdef CONFIG_SYS_SDRAM_BASE1
174	lsr.l	#1, %d2
175#endif
176
177dramsz_loop:
178	lsr.l	#1, %d2
179	add.l	#1, %d1
180	cmp.l	#1, %d2
181	bne	dramsz_loop
182
183	/* SDRAM Chip 0 and 1 */
184	move.l	#(CONFIG_SYS_SDRAM_BASE), (%a1)
185	or.l	%d1, (%a1)
186#ifdef CONFIG_SYS_SDRAM_BASE1
187	move.l	#(CONFIG_SYS_SDRAM_BASE1), (%a2)
188	or.l	%d1, (%a2)
189#endif
190	nop
191
192	/* dram cfg1 and cfg2 */
193	move.l	#0xFC0B8008, %a1
194	move.l	#(CONFIG_SYS_SDRAM_CFG1), (%a1)
195	nop
196	move.l	#0xFC0B800C, %a2
197	move.l	#(CONFIG_SYS_SDRAM_CFG2), (%a2)
198	nop
199
200	move.l	#0xFC0B8000, %a1	/* Mode */
201	move.l	#0xFC0B8004, %a2	/* Ctrl */
202
203	/* Issue PALL */
204	move.l	#(CONFIG_SYS_SDRAM_CTRL + 2), (%a2)
205	nop
206
207	/* Issue LEMR */
208	move.l	#(CONFIG_SYS_SDRAM_MODE), (%a1)
209	nop
210	move.l	#(CONFIG_SYS_SDRAM_EMOD), (%a1)
211	nop
212
213	move.l	#1000, %d0
214wait1000:
215	nop
216	subq.l	#1, %d0
217	bne	wait1000
218
219	/* Issue PALL */
220	move.l	#(CONFIG_SYS_SDRAM_CTRL + 2), (%a2)
221	nop
222
223	/* Perform two refresh cycles */
224	move.l	#(CONFIG_SYS_SDRAM_CTRL + 4), %d0
225	nop
226	move.l	%d0, (%a2)
227	move.l	%d0, (%a2)
228	nop
229
230	move.l	#(CONFIG_SYS_SDRAM_CTRL), %d0
231	and.l	#0x7FFFFFFF, %d0
232	or.l	#0x10000c00, %d0
233	move.l	%d0, (%a2)
234	nop
235
236	/*
237	 * DSPI Initialization
238	 * a0 - general, sram - 0x80008000 - 32, see M52277EVB.h
239	 * a1 - dspi status
240	 * a2 - dtfr
241	 * a3 - drfr
242	 * a4 - Dst addr
243	 */
244
245	/* Enable pins for DSPI mode - chip-selects are enabled later */
246	move.l	#0xFC0A4036, %a0
247	move.b	#0x3F, %d0
248	move.b	%d0, (%a0)
249
250	/* DSPI CS */
251#ifdef CONFIG_SYS_DSPI_CS0
252	move.b	(%a0), %d0
253	or.l	#0xC0, %d0
254	move.b	%d0, (%a0)
255#endif
256#ifdef CONFIG_SYS_DSPI_CS2
257	move.l	#0xFC0A4037, %a0
258	move.b	(%a0), %d0
259	or.l	#0x10, %d0
260	move.b	%d0, (%a0)
261#endif
262	nop
263
264	/* Configure DSPI module */
265	move.l	#0xFC05C000, %a0
266	move.l	#0x80FF0C00, (%a0)	/* Master, clear TX/RX FIFO */
267
268	move.l	#0xFC05C00C, %a0
269	move.l	#0x3E000011, (%a0)
270
271	move.l	#0xFC05C034, %a2	/* dtfr */
272	move.l	#0xFC05C03B, %a3	/* drfr */
273
274	move.l	#(ASM_SBF_IMG_HDR + 4), %a1
275	move.l	(%a1)+, %d5
276	move.l	(%a1), %a4
277
278	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_SBFHDR_DATA_OFFSET), %a0
279	move.l	#(CONFIG_SYS_SBFHDR_SIZE), %d4
280
281	move.l	#0xFC05C02C, %a1	/* dspi status */
282
283	/* Issue commands and address */
284	move.l	#0x8004000B, %d2	/* Fast Read Cmd */
285	jsr	asm_dspi_wr_status
286	jsr	asm_dspi_rd_status
287
288	move.l	#0x80040000, %d2	/* Address byte 2 */
289	jsr	asm_dspi_wr_status
290	jsr	asm_dspi_rd_status
291
292	move.l	#0x80040000, %d2	/* Address byte 1 */
293	jsr	asm_dspi_wr_status
294	jsr	asm_dspi_rd_status
295
296	move.l	#0x80040000, %d2	/* Address byte 0 */
297	jsr	asm_dspi_wr_status
298	jsr	asm_dspi_rd_status
299
300	move.l	#0x80040000, %d2	/* Dummy Wr and Rd */
301	jsr	asm_dspi_wr_status
302	jsr	asm_dspi_rd_status
303
304	/* Transfer serial boot header to sram */
305asm_dspi_rd_loop1:
306	move.l	#0x80040000, %d2
307	jsr	asm_dspi_wr_status
308	jsr	asm_dspi_rd_status
309
310	move.b	%d1, (%a0)		/* read, copy to dst */
311
312	add.l	#1, %a0			/* inc dst by 1 */
313	sub.l	#1, %d4			/* dec cnt by 1 */
314	bne	asm_dspi_rd_loop1
315
316	/* Transfer u-boot from serial flash to memory */
317asm_dspi_rd_loop2:
318	move.l	#0x80040000, %d2
319	jsr	asm_dspi_wr_status
320	jsr	asm_dspi_rd_status
321
322	move.b	%d1, (%a4)		/* read, copy to dst */
323
324	add.l	#1, %a4			/* inc dst by 1 */
325	sub.l	#1, %d5			/* dec cnt by 1 */
326	bne	asm_dspi_rd_loop2
327
328	move.l	#0x00040000, %d2	/* Terminate */
329	jsr	asm_dspi_wr_status
330	jsr	asm_dspi_rd_status
331
332	/* jump to memory and execute */
333	move.l	#(CONFIG_SYS_TEXT_BASE + 0x400), %a0
334	move.l	%a0, (%a1)
335	jmp	(%a0)
336
337asm_dspi_wr_status:
338	move.l	(%a1), %d0		/* status */
339	and.l	#0x0000F000, %d0
340	cmp.l	#0x00003000, %d0
341	bgt	asm_dspi_wr_status
342
343	move.l	%d2, (%a2)
344	rts
345
346asm_dspi_rd_status:
347	move.l	(%a1), %d0		/* status */
348	and.l	#0x000000F0, %d0
349	lsr.l	#4, %d0
350	cmp.l	#0, %d0
351	beq	asm_dspi_rd_status
352
353	move.b	(%a3), %d1
354	rts
355#endif			/* CONFIG_CF_SBF */
356
357	.text
358	. = 0x400
359	.globl	_start
360_start:
361	nop
362	nop
363	move.w #0x2700,%sr		/* Mask off Interrupt */
364
365	/* Set vector base register at the beginning of the Flash */
366#if defined(CONFIG_CF_SBF)
367	move.l	#CONFIG_SYS_TEXT_BASE, %d0
368	movec	%d0, %VBR
369#else
370	move.l	#CONFIG_SYS_FLASH_BASE, %d0
371	movec	%d0, %VBR
372
373	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
374	movec	%d0, %RAMBAR1
375#endif
376
377	/* invalidate and disable cache */
378	move.l	#CF_CACR_CINV, %d0	/* Invalidate cache cmd */
379	movec	%d0, %CACR		/* Invalidate cache */
380	move.l	#0, %d0
381	movec	%d0, %ACR0
382	movec	%d0, %ACR1
383
384	/* initialize general use internal ram */
385	move.l #0, %d0
386	move.l #(ICACHE_STATUS), %a1	/* icache */
387	move.l #(DCACHE_STATUS), %a2	/* icache */
388	move.l %d0, (%a1)
389	move.l %d0, (%a2)
390
391	/* set stackpointer to end of internal ram to get some stackspace for
392	   the first c-code */
393	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
394	clr.l %sp@-
395
396	move.l #__got_start, %a5	/* put relocation table address to a5 */
397
398	bsr cpu_init_f			/* run low-level CPU init code (from flash) */
399	bsr board_init_f		/* run low-level board init code (from flash) */
400
401	/* board_init_f() does not return */
402
403/*------------------------------------------------------------------------------*/
404
405/*
406 * void relocate_code (addr_sp, gd, addr_moni)
407 *
408 * This "function" does not return, instead it continues in RAM
409 * after relocating the monitor code.
410 *
411 * r3 = dest
412 * r4 = src
413 * r5 = length in bytes
414 * r6 = cachelinesize
415 */
416	.globl	relocate_code
417relocate_code:
418	link.w %a6,#0
419	move.l 8(%a6), %sp		/* set new stack pointer */
420
421	move.l 12(%a6), %d0		/* Save copy of Global Data pointer */
422	move.l 16(%a6), %a0		/* Save copy of Destination Address */
423
424	move.l #CONFIG_SYS_MONITOR_BASE, %a1
425	move.l #__init_end, %a2
426	move.l %a0, %a3
427
428	/* copy the code to RAM */
4291:
430	move.l (%a1)+, (%a3)+
431	cmp.l  %a1,%a2
432	bgt.s	 1b
433
434/*
435 * We are done. Do not return, instead branch to second part of board
436 * initialization, now running from RAM.
437 */
438	move.l	%a0, %a1
439	add.l	#(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
440	jmp	(%a1)
441
442in_ram:
443
444clear_bss:
445	/*
446	 * Now clear BSS segment
447	 */
448	move.l	%a0, %a1
449	add.l	#(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
450	move.l	%a0, %d1
451	add.l	#(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
4526:
453	clr.l	(%a1)+
454	cmp.l	%a1,%d1
455	bgt.s	6b
456
457	/*
458	 * fix got table in RAM
459	 */
460	move.l	%a0, %a1
461	add.l	#(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
462	move.l	%a1,%a5			/* * fix got pointer register a5 */
463
464	move.l	%a0, %a2
465	add.l	#(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
466
4677:
468	move.l	(%a1),%d1
469	sub.l	#_start,%d1
470	add.l	%a0,%d1
471	move.l	%d1,(%a1)+
472	cmp.l	%a2, %a1
473	bne	7b
474
475	/* calculate relative jump to board_init_r in ram */
476	move.l %a0, %a1
477	add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
478
479	/* set parameters for board_init_r */
480	move.l %a0,-(%sp)		/* dest_addr */
481	move.l %d0,-(%sp)		/* gd */
482	jsr	(%a1)
483
484/*------------------------------------------------------------------------------*/
485/* exception code */
486	.globl _fault
487_fault:
488	jmp _fault
489	.globl	_exc_handler
490
491_exc_handler:
492	SAVE_ALL
493	movel	%sp,%sp@-
494	bsr exc_handler
495	addql	#4,%sp
496	RESTORE_ALL
497
498	.globl	_int_handler
499_int_handler:
500	SAVE_ALL
501	movel	%sp,%sp@-
502	bsr int_handler
503	addql	#4,%sp
504	RESTORE_ALL
505
506/*------------------------------------------------------------------------------*/
507
508	.globl	version_string
509version_string:
510	.ascii U_BOOT_VERSION_STRING, "\0"
511	.align 4
512