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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 9485076c86c02bd702f889a69c0f4e9c4f2aac75 / . / arch / m68k / cpu / mcf530x / start.S
blob: 32356d875ec13a4fe67b00f9fb522dc28b21583b [file] [log] [blame]
Tom Rini83d290c2018-05-06 17:58:06 -0400[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0+ */
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]2/*
3 * (C) Copyright 2015 Angelo Dureghello <angelo@sysam.it>
4 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]5 */
6
7#include <asm-offsets.h>
8#include <config.h>
9#include "version.h"
10#include <asm/cache.h>
11
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]12#define _START _start
13#define _FAULT _fault
14
15
16.macro SAVE_ALL
17 move.w #0x2700,%sr; /* disable intrs */
18 subl #60,%sp; /* space for 15 regs */
19 moveml %d0-%d7/%a0-%a6,%sp@
20.endm
21
22.macro RESTORE_ALL
23 moveml %sp@,%d0-%d7/%a0-%a6;
24 addl #60,%sp; /* space for 15 regs */
25 rte
26.endm
27
28/* If we come from a pre-loader we don't need an initial exception
29 * table.
30 */
31#if !defined(CONFIG_MONITOR_IS_IN_RAM)
32
33.text
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]34
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]35/*
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]36 * Vector table. This is used for initial platform startup.
37 * These vectors are to catch any un-intended traps.
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]38 */
39_vectors:
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]40/* Flash offset is 0 until we setup CS0 */
41.long 0x00000000
42#if defined(CONFIG_M5307) && \
43 (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
44.long _start - CONFIG_SYS_TEXT_BASE
45#else
46.long _START
47#endif
48
49.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
50.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
51.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
52.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
53.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
55.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
56.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
57
58.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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
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, _FAULT, _FAULT
74.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
75
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
84
85#endif
86
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]87.text
88
89.globl _start
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]90_start:
91 nop
92 nop
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]93 move.w #0x2700,%sr
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]94
95 /* set MBAR address + valid flag */
96 move.l #(CONFIG_SYS_MBAR + 1), %d0
97 move.c %d0, %MBAR
98
99 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
100 move.c %d0, %RAMBAR
101
102 /* DS 4.8.2 (Cache Organization) invalidate and disable cache */
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]103 move.l #CF_CACR_CINVA, %d0
104 movec %d0, %CACR
105 move.l #0, %d0
106 movec %d0, %ACR0
107 movec %d0, %ACR1
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]108
109 /*
110 * if we come from a pre-loader we have no exception table and
111 * therefore no VBR to set
112 */
113#if !defined(CONFIG_MONITOR_IS_IN_RAM)
114 move.l #CONFIG_SYS_FLASH_BASE, %d0
115 movec %d0, %VBR
116#endif
117
118 /* initialize general use internal ram */
119 move.l #0, %d0
120 move.l #(ICACHE_STATUS), %a1 /* icache */
121 move.l #(DCACHE_STATUS), %a2 /* dcache */
122 move.l %d0, (%a1)
123 move.l %d0, (%a2)
124
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]125 /* put relocation table address to a5 */
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]126 move.l #__got_start, %a5
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]127
angelo@sysam.it5044c9c2016-04-27 21:50:44 +0200[diff] [blame]128 /* setup stack initially on top of internal static ram */
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]129 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp
angelo@sysam.it5044c9c2016-04-27 21:50:44 +0200[diff] [blame]130
131 /*
132 * if configured, malloc_f arena will be reserved first,
133 * then (and always) gd struct space will be reserved
134 */
135 move.l %sp, -(%sp)
136 bsr board_init_f_alloc_reserve
137
138 /* update stack and frame-pointers */
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]139 move.l %d0, %sp
140 move.l %sp, %fp
angelo@sysam.it5044c9c2016-04-27 21:50:44 +0200[diff] [blame]141
142 /* initialize reserved area */
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]143 move.l %d0, -(%sp)
144 bsr board_init_f_init_reserve
angelo@sysam.it5044c9c2016-04-27 21:50:44 +0200[diff] [blame]145
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]146 /* run low-level CPU init code (from flash) */
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]147 bsr cpu_init_f
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]148
149 /* run low-level board init code (from flash) */
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]150 clr.l %sp@-
151 bsr board_init_f
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]152
153 /* board_init_f() does not return */
154
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]155/******************************************************************************/
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]156
157/*
Simon Glass94133872019-12-28 10:44:45 -0700[diff] [blame]158 * void relocate_code(addr_sp, gd, addr_moni)
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]159 *
160 * This "function" does not return, instead it continues in RAM
161 * after relocating the monitor code.
162 *
163 */
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]164.globl relocate_code
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]165relocate_code:
166 link.w %a6,#0
167 move.l 8(%a6), %sp /* set new stack pointer */
168 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */
169 move.l 16(%a6), %a0 /* Save copy of Destination Address */
170
171 move.l #CONFIG_SYS_MONITOR_BASE, %a1
172 move.l #__init_end, %a2
173 move.l %a0, %a3
174 /* copy the code to RAM */
1751:
176 move.l (%a1)+, (%a3)+
177 cmp.l %a1,%a2
178 bgt.s 1b
179
180/*
181 * We are done. Do not return, instead branch to second part of board
182 * initialization, now running from RAM.
183 */
184 move.l %a0, %a1
185 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
186 jmp (%a1)
187
188in_ram:
189
190clear_bss:
191 /*
192 * Now clear BSS segment
193 */
194 move.l %a0, %a1
195 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE), %a1
196 move.l %a0, %d1
197 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE), %d1
1986:
199 clr.l (%a1)+
200 cmp.l %a1,%d1
201 bgt.s 6b
202
203 /*
204 * fix got table in RAM
205 */
206 move.l %a0, %a1
207 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE), %a1
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]208
209 /* fix got pointer register a5 */
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]210 move.l %a1,%a5
211
212 move.l %a0, %a2
213 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE), %a2
214
2157:
216 move.l (%a1),%d1
217 sub.l #_start, %d1
218 add.l %a0,%d1
219 move.l %d1,(%a1)+
220 cmp.l %a2, %a1
221 bne 7b
222
223 /* calculate relative jump to board_init_r in ram */
224 move.l %a0, %a1
225 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
226
227 /* set parameters for board_init_r */
228 move.l %a0,-(%sp) /* dest_addr */
229 move.l %d0,-(%sp) /* gd */
230#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE!=CONFIG_SYS_INT_FLASH_BASE) && \
231 defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
232 halt
233#endif
234 jsr (%a1)
235
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]236/******************************************************************************/
237
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]238/* exception code */
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]239.globl _fault
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]240_fault:
241 bra _fault
242
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]243.globl _exc_handler
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]244_exc_handler:
245 SAVE_ALL
246 movel %sp,%sp@-
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]247 bsr exc_handler
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]248 addql #4,%sp
249 RESTORE_ALL
250
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]251.globl _int_handler
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]252_int_handler:
253 SAVE_ALL
254 movel %sp,%sp@-
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]255 bsr int_handler
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]256 addql #4,%sp
257 RESTORE_ALL
258
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]259/******************************************************************************/
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]260
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]261.globl version_string
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame]262version_string:
Angelo Dureghello5c928d02016-05-22 00:14:29 +0200[diff] [blame]263.ascii U_BOOT_VERSION
264.ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
265.ascii CONFIG_IDENT_STRING, "\0"
266.align 4