1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* armboot - Startup Code for XScale CPU-core
*
* Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
* Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
* Copyright (C) 2000 Wolfgang Denk <wd@denx.de>
* Copyright (C) 2001 Alex Zuepke <azu@sysgo.de>
* Copyright (C) 2001 Marius Groger <mag@sysgo.de>
* Copyright (C) 2002 Alex Zupke <azu@sysgo.de>
* Copyright (C) 2002 Gary Jennejohn <garyj@denx.de>
* Copyright (C) 2002 Kyle Harris <kharris@nexus-tech.net>
* Copyright (C) 2003 Kai-Uwe Bloem <kai-uwe.bloem@auerswald.de>
* Copyright (C) 2003 Kshitij <kshitij@ti.com>
* Copyright (C) 2003 Richard Woodruff <r-woodruff2@ti.com>
* Copyright (C) 2003 Robert Schwebel <r.schwebel@pengutronix.de>
* Copyright (C) 2004 Texas Instruments <r-woodruff2@ti.com>
* Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
*/
#include <asm-offsets.h>
#include <config.h>
/*
*************************************************************************
*
* Startup Code (reset vector)
*
* do important init only if we don't start from memory!
* setup Memory and board specific bits prior to relocation.
* relocate armboot to ram
* setup stack
*
*************************************************************************
*/
.globl reset
reset:
/*
* set the cpu to SVC32 mode
*/
mrs r0,cpsr
bic r0,r0,#0x1f
orr r0,r0,#0xd3
msr cpsr,r0
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
bl cpu_init_crit
#endif
#ifdef CONFIG_CPU_PXA25X
bl lock_cache_for_stack
#endif
#ifdef CONFIG_CPU_PXA27X
/*
* enable clock for SRAM
*/
ldr r0,=CKEN
ldr r1,[r0]
orr r1,r1,#(1 << 20)
str r1,[r0]
#endif
bl _main
/*------------------------------------------------------------------------------*/
.globl c_runtime_cpu_setup
c_runtime_cpu_setup:
#ifdef CONFIG_CPU_PXA25X
/*
* Unlock (actually, disable) the cache now that board_init_f
* is done. We could do this earlier but we would need to add
* a new C runtime hook, whereas c_runtime_cpu_setup already
* exists.
* As this routine is just a call to cpu_init_crit, let us
* tail-optimize and do a simple branch here.
*/
b cpu_init_crit
#else
bx lr
#endif
/*
*************************************************************************
*
* CPU_init_critical registers
*
* setup important registers
* setup memory timing
*
*************************************************************************
*/
#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) || defined(CONFIG_CPU_PXA25X)
cpu_init_crit:
/*
* flush v4 I/D caches
*/
mov r0, #0
mcr p15, 0, r0, c7, c7, 0 /* Invalidate I+D+BTB caches */
mcr p15, 0, r0, c8, c7, 0 /* Invalidate Unified TLB */
/*
* disable MMU stuff and caches
*/
mrc p15, 0, r0, c1, c0, 0
bic r0, r0, #0x00003300 @ clear bits 13:12, 9:8 (--VI --RS)
bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
orr r0, r0, #0x00000002 @ set bit 1 (A) Align
mcr p15, 0, r0, c1, c0, 0
mov pc, lr /* back to my caller */
#endif /* !CONFIG_SKIP_LOWLEVEL_INIT || CONFIG_CPU_PXA25X */
/*
* Enable MMU to use DCache as DRAM.
*
* This is useful on PXA25x and PXA26x in early bootstages, where there is no
* other possible memory available to hold stack.
*/
#ifdef CONFIG_CPU_PXA25X
.macro CPWAIT reg
mrc p15, 0, \reg, c2, c0, 0
mov \reg, \reg
sub pc, pc, #4
.endm
lock_cache_for_stack:
/* Domain access -- enable for all CPs */
ldr r0, =0x0000ffff
mcr p15, 0, r0, c3, c0, 0
/* Point TTBR to MMU table */
ldr r0, =mmutable
mcr p15, 0, r0, c2, c0, 0
/* Kick in MMU, ICache, DCache, BTB */
mrc p15, 0, r0, c1, c0, 0
bic r0, #0x1b00
bic r0, #0x0087
orr r0, #0x1800
orr r0, #0x0005
mcr p15, 0, r0, c1, c0, 0
CPWAIT r0
/* Unlock Icache, Dcache */
mcr p15, 0, r0, c9, c1, 1
mcr p15, 0, r0, c9, c2, 1
/* Flush Icache, Dcache, BTB */
mcr p15, 0, r0, c7, c7, 0
/* Unlock I-TLB, D-TLB */
mcr p15, 0, r0, c10, c4, 1
mcr p15, 0, r0, c10, c8, 1
/* Flush TLB */
mcr p15, 0, r0, c8, c7, 0
/* Allocate 4096 bytes of Dcache as RAM */
/* Drain pending loads and stores */
mcr p15, 0, r0, c7, c10, 4
mov r4, #0x00
mov r5, #0x00
mov r2, #0x01
mcr p15, 0, r0, c9, c2, 0
CPWAIT r0
/* 128 lines reserved (128 x 32bytes = 4096 bytes total) */
mov r0, #128
ldr r1, =0xfffff000
alloc:
mcr p15, 0, r1, c7, c2, 5
/* Drain pending loads and stores */
mcr p15, 0, r0, c7, c10, 4
strd r4, [r1], #8
strd r4, [r1], #8
strd r4, [r1], #8
strd r4, [r1], #8
subs r0, #0x01
bne alloc
/* Drain pending loads and stores */
mcr p15, 0, r0, c7, c10, 4
mov r2, #0x00
mcr p15, 0, r2, c9, c2, 0
CPWAIT r0
mov pc, lr
.section .mmutable, "a"
mmutable:
.align 14
/* 0x00000000 - 0xffe00000 : 1:1, uncached mapping */
.set __base, 0
.rept 0xfff
.word (__base << 20) | 0xc12
.set __base, __base + 1
.endr
/* 0xfff00000 : 1:1, cached mapping */
.word (0xfff << 20) | 0x1c1e
#endif /* CONFIG_CPU_PXA25X */
|
