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
206
207
208
209
210
211
212
213
214
|
/*
* Board specific setup info
*
* (C) Copyright 2003, ARM Ltd.
* Philippe Robin, <philippe.robin@arm.com>
*
* 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
*/
#include <config.h>
#include <version.h>
/* Reset using CM control register */
.global reset_cpu
reset_cpu:
mov r0, #CM_BASE
ldr r1,[r0,#OS_CTRL]
orr r1,r1,#CMMASK_RESET
str r1,[r0,#OS_CTRL]
reset_failed:
b reset_failed
/* Set up the platform, once the cpu has been initialized */
.globl lowlevel_init
lowlevel_init:
/* If U-Boot has been run after the ARM boot monitor
* then all the necessary actions have been done
* otherwise we are running from user flash mapped to 0x00000000
* --- DO NOT REMAP BEFORE THE CODE HAS BEEN RELOCATED --
* Changes to the (possibly soft) reset defaults of the processor
* itself should be performed in cpu/arm<>/start.S
* This function affects only the core module or board settings
*/
#ifdef CONFIG_CM_INIT
/* CM has an initialization register
* - bits in it are wired into test-chip pins to force
* reset defaults
* - may need to change its contents for U-Boot
*/
/* set the desired CM specific value */
mov r2,#CMMASK_LOWVEC /* Vectors at 0x00000000 for all */
#if defined (CONFIG_CM10200E) || defined (CONFIG_CM10220E)
orr r2,r2,#CMMASK_INIT_102
#else
#if !defined (CONFIG_CM920T) && !defined (CONFIG_CM920T_ETM) && \
!defined (CONFIG_CM940T)
/* CMxx6 code */
#ifdef CONFIG_CM_MULTIPLE_SSRAM
/* set simple mapping */
and r2,r2,#CMMASK_MAP_SIMPLE
#endif /* #ifdef CONFIG_CM_MULTIPLE_SSRAM */
#ifdef CONFIG_CM_TCRAM
/* disable TCRAM */
and r2,r2,#CMMASK_TCRAM_DISABLE
#endif /* #ifdef CONFIG_CM_TCRAM */
#if defined (CONFIG_CM926EJ_S) || defined (CONFIG_CM1026EJ_S) || \
defined (CONFIG_CM1136JF_S)
and r2,r2,#CMMASK_LE
#endif /* cpu with little endian initialization */
orr r2,r2,#CMMASK_CMxx6_COMMON
#endif /* CMxx6 code */
#endif /* ARM102xxE value */
/* read CM_INIT */
mov r0, #CM_BASE
ldr r1, [r0, #OS_INIT]
/* check against desired bit setting */
and r3,r1,r2
cmp r3,r2
beq init_reg_OK
/* lock for change */
mov r3, #CMVAL_LOCK1
and r3, r3, #CMVAL_LOCK2
str r3, [r0, #OS_LOCK]
/* set desired value */
orr r1,r1,r2
/* write & relock CM_INIT */
str r1, [r0, #OS_INIT]
mov r1, #CMVAL_UNLOCK
str r1, [r0, #OS_LOCK]
/* soft reset so new values used */
b reset_cpu
init_reg_OK:
#endif /* CONFIG_CM_INIT */
mov pc, lr
#ifdef CONFIG_CM_SPD_DETECT
/* Fast memory is available for the DRAM data
* - ensure it has been transferred, then summarize the data
* into a CM register
*/
.globl dram_query
dram_query:
stmfd r13!,{r4-r6,lr}
/* set up SDRAM info */
/* - based on example code from the CM User Guide */
mov r0, #CM_BASE
readspdbit:
ldr r1, [r0, #OS_SDRAM] /* read the SDRAM register */
and r1, r1, #0x20 /* mask SPD bit (5) */
cmp r1, #0x20 /* test if set */
bne readspdbit
setupsdram:
add r0, r0, #OS_SPD /* address the copy of the SDP data */
ldrb r1, [r0, #3] /* number of row address lines */
ldrb r2, [r0, #4] /* number of column address lines */
ldrb r3, [r0, #5] /* number of banks */
ldrb r4, [r0, #31] /* module bank density */
mul r5, r4, r3 /* size of SDRAM (MB divided by 4) */
mov r5, r5, ASL#2 /* size in MB */
mov r0, #CM_BASE /* reload for later code */
cmp r5, #0x10 /* is it 16MB? */
bne not16
mov r6, #0x2 /* store size and CAS latency of 2 */
b writesize
not16:
cmp r5, #0x20 /* is it 32MB? */
bne not32
mov r6, #0x6
b writesize
not32:
cmp r5, #0x40 /* is it 64MB? */
bne not64
mov r6, #0xa
b writesize
not64:
cmp r5, #0x80 /* is it 128MB? */
bne not128
mov r6, #0xe
b writesize
not128:
/* if it is none of these sizes then it is either 256MB, or
* there is no SDRAM fitted so default to 256MB
*/
mov r6, #0x12
writesize:
mov r1, r1, ASL#8 /* row addr lines from SDRAM reg */
orr r2, r1, r2, ASL#12 /* OR in column address lines */
orr r3, r2, r3, ASL#16 /* OR in number of banks */
orr r6, r6, r3 /* OR in size and CAS latency */
str r6, [r0, #OS_SDRAM] /* store SDRAM parameters */
#endif /* #ifdef CONFIG_CM_SPD_DETECT */
ldmfd r13!,{r4-r6,pc} /* back to caller */
#ifdef CONFIG_CM_REMAP
/* CM remap bit is operational
* - use it to map writeable memory at 0x00000000, in place of flash
*/
.globl cm_remap
cm_remap:
stmfd r13!,{r4-r10,lr}
mov r0, #CM_BASE
ldr r1, [r0, #OS_CTRL]
orr r1, r1, #CMMASK_REMAP /* set remap and led bits */
str r1, [r0, #OS_CTRL]
/* Now 0x00000000 is writeable, replace the vectors */
ldr r0, =_start /* r0 <- start of vectors */
ldr r2, =_armboot_start /* r2 <- past vectors */
sub r1,r1,r1 /* destination 0x00000000 */
copy_vec:
ldmia r0!, {r3-r10} /* copy from source address [r0] */
stmia r1!, {r3-r10} /* copy to target address [r1] */
cmp r0, r2 /* until source end address [r2] */
ble copy_vec
ldmfd r13!,{r4-r10,pc} /* back to caller */
#endif /* #ifdef CONFIG_CM_REMAP */
|
