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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 327f7a020a3037ae8ef6c94488d5e9a3aa772943 / . / board / sandpoint / early_init.S
blob: 127bd37fa518ed0aff1e66f8ad86357a16e2f6fb [file] [log] [blame]
wdenk327f7a02001-11-28 17:49:55 +0000[diff] [blame^]1/*
2 * (C) Copyright 2001
3 * Thomas Koeller, tkoeller@gmx.net
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#ifndef __ASSEMBLY__
25#define __ASSEMBLY__ 1
26#endif
27
28#include <config.h>
29#include <asm/processor.h>
30#include <mpc824x.h>
31#include <ppc_asm.tmpl>
32
33#if defined(USE_DINK32)
34 /* We are running from RAM, so do not clear the MCCR1_MEMGO bit! */
35 #define MCCR1VAL ((CFG_ROMNAL << MCCR1_ROMNAL_SHIFT) | (CFG_ROMFAL << MCCR1_ROMFAL_SHIFT) | MCCR1_MEMGO)
36#else
37 #define MCCR1VAL (CFG_ROMNAL << MCCR1_ROMNAL_SHIFT) | (CFG_ROMFAL << MCCR1_ROMFAL_SHIFT)
38#endif
39
40 .text
41
42 /* Values to program into memory controller registers */
43tbl: .long MCCR1, MCCR1VAL
44 .long MCCR2, CFG_REFINT << MCCR2_REFINT_SHIFT
45 .long MCCR3
46 .long (((CFG_BSTOPRE & 0x000000f0) >> 4) << MCCR3_BSTOPRE2TO5_SHIFT) | \
47 (CFG_REFREC << MCCR3_REFREC_SHIFT) | \
48 (CFG_RDLAT << MCCR3_RDLAT_SHIFT)
49 .long MCCR4
50 .long (CFG_PRETOACT << MCCR4_PRETOACT_SHIFT) | (CFG_ACTTOPRE << MCCR4_ACTTOPRE_SHIFT) | \
51 (CFG_REGISTERD_TYPE_BUFFER << 20) | \
52 (((CFG_BSTOPRE & 0x00000300) >> 8) << MCCR4_BSTOPRE0TO1_SHIFT ) | \
53 ((CFG_SDMODE_CAS_LAT << 4) | (CFG_SDMODE_WRAP << 3) | \
54 (CFG_SDMODE_BURSTLEN) << MCCR4_SDMODE_SHIFT) | \
55 (CFG_ACTTORW << MCCR4_ACTTORW_SHIFT) | \
56 ((CFG_BSTOPRE & 0x0000000f) << MCCR4_BSTOPRE6TO9_SHIFT )
57 .long MSAR1
58 .long (((CFG_BANK0_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \
59 (((CFG_BANK1_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \
60 (((CFG_BANK2_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
61 (((CFG_BANK3_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
62 .long EMSAR1
63 .long (((CFG_BANK0_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \
64 (((CFG_BANK1_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \
65 (((CFG_BANK2_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
66 (((CFG_BANK3_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
67 .long MSAR2
68 .long (((CFG_BANK4_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \
69 (((CFG_BANK5_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \
70 (((CFG_BANK6_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
71 (((CFG_BANK7_START & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
72 .long EMSAR2
73 .long (((CFG_BANK4_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \
74 (((CFG_BANK5_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \
75 (((CFG_BANK6_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
76 (((CFG_BANK7_START & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
77 .long MEAR1
78 .long (((CFG_BANK0_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \
79 (((CFG_BANK1_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \
80 (((CFG_BANK2_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
81 (((CFG_BANK3_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
82 .long EMEAR1
83 .long (((CFG_BANK0_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \
84 (((CFG_BANK1_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \
85 (((CFG_BANK2_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
86 (((CFG_BANK3_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
87 .long MEAR2
88 .long (((CFG_BANK4_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 0) | \
89 (((CFG_BANK5_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 8) | \
90 (((CFG_BANK6_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 16) | \
91 (((CFG_BANK7_END & MICR_ADDR_MASK) >> MICR_ADDR_SHIFT) << 24)
92 .long EMEAR2
93 .long (((CFG_BANK4_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 0) | \
94 (((CFG_BANK5_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 8) | \
95 (((CFG_BANK6_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 16) | \
96 (((CFG_BANK7_END & MICR_EADDR_MASK) >> MICR_EADDR_SHIFT) << 24)
97 .long 0
98
99
100
101 /*
102 * Early CPU initialization. Set up memory controller, so we can access any RAM at all. This
103 * must be done in assembly, since we have no stack at this point.
104 */
105 .global early_init_f
106early_init_f:
107 mflr r10
108
109 /* basic memory controller configuration */
110 lis r3, CONFIG_ADDR_HIGH
111 lis r4, CONFIG_DATA_HIGH
112 bl lab
113lab: mflr r5
114 lwzu r0, tbl - lab(r5)
115loop: lwz r1, 4(r5)
116 stwbrx r0, 0, r3
117 eieio
118 stwbrx r1, 0, r4
119 eieio
120 lwzu r0, 8(r5)
121 cmpli cr0, 0, r0, 0
122 bne cr0, loop
123
124 /* set bank enable bits */
125 lis r0, MBER@h
126 ori r0, 0, MBER@l
127 li r1, CFG_BANK_ENABLE
128 stwbrx r0, 0, r3
129 eieio
130 stb r1, 0(r4)
131 eieio
132
133 /* delay loop */
134 lis r0, 0x0003
135 mtctr r0
136delay: bdnz delay
137
138 /* enable memory controller */
139 lis r0, MCCR1@h
140 ori r0, 0, MCCR1@l
141 stwbrx r0, 0, r3
142 eieio
143 lwbrx r0, 0, r4
144 oris r0, 0, MCCR1_MEMGO@h
145 stwbrx r0, 0, r4
146 eieio
147
148 /* set up stack pointer */
149 lis r1, CFG_INIT_SP_OFFSET@h
150 ori r1, r1, CFG_INIT_SP_OFFSET@l
151
152 mtlr r10
153 blr
154