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
|
/*
* Lowlevel setup for SMDK5250 board based on S5PC520
*
* Copyright (C) 2012 Samsung Electronics
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <version.h>
#include <asm/arch/cpu.h>
_TEXT_BASE:
.word CONFIG_SYS_TEXT_BASE
.globl lowlevel_init
lowlevel_init:
/* use iRAM stack in bl2 */
ldr sp, =CONFIG_IRAM_STACK
stmdb r13!, {ip,lr}
/* check reset status */
ldr r0, =(EXYNOS5_POWER_BASE + INFORM1_OFFSET)
ldr r1, [r0]
/* AFTR wakeup reset */
ldr r2, =S5P_CHECK_DIDLE
cmp r1, r2
beq exit_wakeup
/* LPA wakeup reset */
ldr r2, =S5P_CHECK_LPA
cmp r1, r2
beq exit_wakeup
/* Sleep wakeup reset */
ldr r2, =S5P_CHECK_SLEEP
cmp r1, r2
beq wakeup_reset
/*
* If U-boot is already running in RAM, no need to relocate U-Boot.
* Memory controller must be configured before relocating U-Boot
* in ram.
*/
ldr r0, =0x0ffffff /* r0 <- Mask Bits*/
bic r1, pc, r0 /* pc <- current addr of code */
/* r1 <- unmasked bits of pc */
ldr r2, _TEXT_BASE /* r2 <- original base addr in ram */
bic r2, r2, r0 /* r2 <- unmasked bits of r2*/
cmp r1, r2 /* compare r1, r2 */
beq 1f /* r0 == r1 then skip sdram init */
/* init system clock */
bl system_clock_init
/* Memory initialize */
bl mem_ctrl_init
1:
bl arch_cpu_init
bl tzpc_init
ldmia r13!, {ip,pc}
wakeup_reset:
bl system_clock_init
bl mem_ctrl_init
bl arch_cpu_init
bl tzpc_init
exit_wakeup:
/* Load return address and jump to kernel */
ldr r0, =(EXYNOS5_POWER_BASE + INFORM0_OFFSET)
/* r1 = physical address of exynos5_cpu_resume function*/
ldr r1, [r0]
/* Jump to kernel */
mov pc, r1
nop
nop
|
