summaryrefslogtreecommitdiffstats
path: root/board/hidden_dragon/early_init.S
blob: 61b4b55534226357e1f74120baf3f484c2feeec0 (plain)
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
/*
 * (C) Copyright 2001
 * Thomas Koeller, tkoeller@gmx.net
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#ifndef	__ASSEMBLY__
#define __ASSEMBLY__	1
#endif

#include <asm-offsets.h>
#include <config.h>
#include <asm/processor.h>
#include <mpc824x.h>
#include <ppc_asm.tmpl>

#if defined(USE_DINK32)
  /* We are running from RAM, so do not clear the MCCR1_MEMGO bit! */
  #define MCCR1VAL ((CONFIG_SYS_ROMNAL << MCCR1_ROMNAL_SHIFT) | (CONFIG_SYS_ROMFAL << MCCR1_ROMFAL_SHIFT) | MCCR1_MEMGO)
#else
  #define MCCR1VAL (CONFIG_SYS_ROMNAL << MCCR1_ROMNAL_SHIFT) | (CONFIG_SYS_ROMFAL << MCCR1_ROMFAL_SHIFT)
#endif

	.text

	/* Values to program into memory controller registers */
tbl:	.long	MCCR1, MCCR1VAL
	.long	MCCR2, CONFIG_SYS_REFINT << MCCR2_REFINT_SHIFT
	.long	MCCR3
	.long	(((CONFIG_SYS_BSTOPRE & 0x000000f0) >> 4) << MCCR3_BSTOPRE2TO5_SHIFT) | \
		(CONFIG_SYS_REFREC << MCCR3_REFREC_SHIFT) | \
		(CONFIG_SYS_RDLAT  << MCCR3_RDLAT_SHIFT)
	.long	MCCR4
	.long	(CONFIG_SYS_PRETOACT << MCCR4_PRETOACT_SHIFT) | (CONFIG_SYS_ACTTOPRE << MCCR4_ACTTOPRE_SHIFT) | \
		(CONFIG_SYS_REGISTERD_TYPE_BUFFER << 20) | \
		(((CONFIG_SYS_BSTOPRE & 0x00000300) >> 8) << MCCR4_BSTOPRE0TO1_SHIFT ) | \
		((CONFIG_SYS_SDMODE_CAS_LAT << 4) | (CONFIG_SYS_SDMODE_WRAP << 3) | \
		(CONFIG_SYS_SDMODE_BURSTLEN) << MCCR4_SDMODE_SHIFT) | \
		(CONFIG_SYS_ACTTORW << MCCR4_ACTTORW_SHIFT) | \
		((CONFIG_SYS_BSTOPRE & 0x0000000f) << MCCR4_BSTOPRE6TO9_SHIFT )
	.long	MSAR1
	.long	(((CONFIG_SYS_BANK0_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) <<  0) | \
		(((CONFIG_SYS_BANK1_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) <<  8) | \
		(((CONFIG_SYS_BANK2_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
		(((CONFIG_SYS_BANK3_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
	.long	EMSAR1
	.long	(((CONFIG_SYS_BANK0_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) <<  0) | \
		(((CONFIG_SYS_BANK1_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) <<  8) | \
		(((CONFIG_SYS_BANK2_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
		(((CONFIG_SYS_BANK3_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
	.long	MSAR2
	.long	(((CONFIG_SYS_BANK4_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) <<  0) | \
		(((CONFIG_SYS_BANK5_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) <<  8) | \
		(((CONFIG_SYS_BANK6_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
		(((CONFIG_SYS_BANK7_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
	.long	EMSAR2
	.long	(((CONFIG_SYS_BANK4_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) <<  0) | \
		(((CONFIG_SYS_BANK5_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) <<  8) | \
		(((CONFIG_SYS_BANK6_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
		(((CONFIG_SYS_BANK7_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
	.long	MEAR1
	.long	(((CONFIG_SYS_BANK0_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) <<  0) | \
		(((CONFIG_SYS_BANK1_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) <<  8) | \
		(((CONFIG_SYS_BANK2_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
		(((CONFIG_SYS_BANK3_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
	.long	EMEAR1
	.long	(((CONFIG_SYS_BANK0_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) <<  0) | \
		(((CONFIG_SYS_BANK1_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) <<  8) | \
		(((CONFIG_SYS_BANK2_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
		(((CONFIG_SYS_BANK3_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
	.long	MEAR2
	.long	(((CONFIG_SYS_BANK4_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) <<  0) | \
		(((CONFIG_SYS_BANK5_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) <<  8) | \
		(((CONFIG_SYS_BANK6_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
		(((CONFIG_SYS_BANK7_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
	.long	EMEAR2
	.long	(((CONFIG_SYS_BANK4_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) <<  0) | \
		(((CONFIG_SYS_BANK5_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) <<  8) | \
		(((CONFIG_SYS_BANK6_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
		(((CONFIG_SYS_BANK7_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
	.long	0


	/*
	 * Early CPU initialization. Set up memory controller, so we can access any RAM at all. This
	 * must be done in assembly, since we have no stack at this point.
	 */
	.global	early_init_f
early_init_f:
	mflr	r10

	/* basic memory controller configuration */
	lis	r3, CONFIG_ADDR_HIGH
	lis	r4, CONFIG_DATA_HIGH
	bl	lab
lab:	mflr	r5
	lwzu	r0, tbl - lab(r5)
loop:	lwz	r1, 4(r5)
	stwbrx	r0, 0, r3
	eieio
	stwbrx	r1, 0, r4
	eieio
	lwzu	r0, 8(r5)
	cmpli	cr0, 0, r0, 0
	bne	cr0, loop

	/* set bank enable bits */
	lis	r0, MBER@h
	ori	r0, 0, MBER@l
	li	r1, CONFIG_SYS_BANK_ENABLE
	stwbrx	r0, 0, r3
	eieio
	stb	r1, 0(r4)
	eieio

	/* delay loop */
	lis	r0, 0x0003
	mtctr   r0
delay:	bdnz	delay

	/* enable memory controller */
	lis	r0, MCCR1@h
	ori	r0, 0, MCCR1@l
	stwbrx	r0, 0, r3
	eieio
	lwbrx	r0, 0, r4
	oris	r0, 0, MCCR1_MEMGO@h
	stwbrx	r0, 0, r4
	eieio

	/* set up stack pointer */
	lis	r1, CONFIG_SYS_INIT_SP_OFFSET@h
	ori	r1, r1, CONFIG_SYS_INIT_SP_OFFSET@l

	mtlr	r10
	blr
OpenPOWER on IntegriCloud