Gitiles
Code Review Sign In
gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 8bc4ee9e8213abe4031ea1720aa02fa98d4402ad / . / board / samsung / smdkc100 / lowlevel_init.S
blob: 32572c51da9ac155d00bf90b7258c616df3ecf1a [file] [log] [blame]
Minkyu Kang8bc4ee92009-10-01 17:20:40 +0900[diff] [blame^]1/*
2 * Copyright (C) 2009 Samsung Electronics
3 * Kyungmin Park <kyungmin.park@samsung.com>
4 * Minkyu Kang <mk7.kang@samsung.com>
5 *
6 * See file CREDITS for list of people who contributed to this
7 * project.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 * MA 02111-1307 USA
23 */
24
25#include <config.h>
26#include <version.h>
27#include <asm/arch/cpu.h>
28#include <asm/arch/power.h>
29
30/*
31 * Register usages:
32 *
33 * r5 has zero always
34 */
35
36_TEXT_BASE:
37 .word TEXT_BASE
38
39 .globl lowlevel_init
40lowlevel_init:
41 mov r9, lr
42
43 /* r5 has always zero */
44 mov r5, #0
45
46 ldr r8, =S5PC100_GPIO_BASE
47
48 /* Disable Watchdog */
49 ldr r0, =S5PC100_WATCHDOG_BASE @0xEA200000
50 orr r0, r0, #0x0
51 str r5, [r0]
52
53#ifndef CONFIG_ONENAND_IPL
54 /* setting SRAM */
55 ldr r0, =S5PC100_SROMC_BASE
56 ldr r1, =0x9
57 str r1, [r0]
58#endif
59
60 /* S5PC100 has 3 groups of interrupt sources */
61 ldr r0, =S5PC100_VIC0_BASE @0xE4000000
62 ldr r1, =S5PC100_VIC1_BASE @0xE4000000
63 ldr r2, =S5PC100_VIC2_BASE @0xE4000000
64
65 /* Disable all interrupts (VIC0, VIC1 and VIC2) */
66 mvn r3, #0x0
67 str r3, [r0, #0x14] @INTENCLEAR
68 str r3, [r1, #0x14] @INTENCLEAR
69 str r3, [r2, #0x14] @INTENCLEAR
70
71#ifndef CONFIG_ONENAND_IPL
72 /* Set all interrupts as IRQ */
73 str r5, [r0, #0xc] @INTSELECT
74 str r5, [r1, #0xc] @INTSELECT
75 str r5, [r2, #0xc] @INTSELECT
76
77 /* Pending Interrupt Clear */
78 str r5, [r0, #0xf00] @INTADDRESS
79 str r5, [r1, #0xf00] @INTADDRESS
80 str r5, [r2, #0xf00] @INTADDRESS
81#endif
82
83#ifndef CONFIG_ONENAND_IPL
84 /* for UART */
85 bl uart_asm_init
86
87 /* for TZPC */
88 bl tzpc_asm_init
89#endif
90
91#ifdef CONFIG_ONENAND_IPL
92 /* init system clock */
93 bl system_clock_init
94
95 bl mem_ctrl_asm_init
96
97 /* Wakeup support. Don't know if it's going to be used, untested. */
98 ldr r0, =S5PC100_RST_STAT
99 ldr r1, [r0]
100 bic r1, r1, #0xfffffff7
101 cmp r1, #0x8
102 beq wakeup_reset
103#endif
104
1051:
106 mov lr, r9
107 mov pc, lr
108
109#ifdef CONFIG_ONENAND_IPL
110wakeup_reset:
111
112 /* Clear wakeup status register */
113 ldr r0, =S5PC100_WAKEUP_STAT
114 ldr r1, [r0]
115 str r1, [r0]
116
117 /* Load return address and jump to kernel */
118 ldr r0, =S5PC100_INFORM0
119
120 /* r1 = physical address of s5pc100_cpu_resume function */
121 ldr r1, [r0]
122
123 /* Jump to kernel (sleep.S) */
124 mov pc, r1
125 nop
126 nop
127#endif
128
129/*
130 * system_clock_init: Initialize core clock and bus clock.
131 * void system_clock_init(void)
132 */
133system_clock_init:
134 ldr r8, =S5PC1XX_CLOCK_BASE @ 0xE0100000
135
136 /* Set Clock divider */
137 ldr r1, =0x00011110
138 str r1, [r8, #0x304]
139 ldr r1, =0x1
140 str r1, [r8, #0x308]
141 ldr r1, =0x00011301
142 str r1, [r8, #0x300]
143
144 /* Set Lock Time */
145 ldr r1, =0xe10 @ Locktime : 0xe10 = 3600
146 str r1, [r8, #0x000] @ APLL_LOCK
147 str r1, [r8, #0x004] @ MPLL_LOCK
148 str r1, [r8, #0x008] @ EPLL_LOCK
149 str r1, [r8, #0x00C] @ HPLL_LOCK
150
151 /* APLL_CON */
152 ldr r1, =0x81bc0400 @ SDIV 0, PDIV 4, MDIV 444 (1332MHz)
153 str r1, [r8, #0x100]
154 /* MPLL_CON */
155 ldr r1, =0x80590201 @ SDIV 1, PDIV 2, MDIV 89 (267MHz)
156 str r1, [r8, #0x104]
157 /* EPLL_CON */
158 ldr r1, =0x80870303 @ SDIV 3, PDIV 3, MDIV 135 (67.5MHz)
159 str r1, [r8, #0x108]
160 /* HPLL_CON */
161 ldr r1, =0x80600603
162 str r1, [r8, #0x10C]
163
164 /* Set Source Clock */
165 ldr r1, =0x1111 @ A, M, E, HPLL Muxing
166 str r1, [r8, #0x200] @ CLK_SRC0
167
168 ldr r1, =0x1000001 @ Uart Clock & CLK48M Muxing
169 str r1, [r8, #0x204] @ CLK_SRC1
170
171 ldr r1, =0x9000 @ ARMCLK/4
172 str r1, [r8, #0x400] @ CLK_OUT
173
174 /* wait at least 200us to stablize all clock */
175 mov r2, #0x10000
1761: subs r2, r2, #1
177 bne 1b
178
179 mov pc, lr
180
181#ifndef CONFIG_ONENAND_IPL
182/*
183 * uart_asm_init: Initialize UART's pins
184 */
185uart_asm_init:
186 mov r0, r8
187 ldr r1, =0x22222222
188 str r1, [r0, #0x0] @ GPA0_CON
189 ldr r1, =0x00022222
190 str r1, [r0, #0x20] @ GPA1_CON
191
192 mov pc, lr
193
194/*
195 * tzpc_asm_init: Initialize TZPC
196 */
197tzpc_asm_init:
198 ldr r0, =0xE3800000
199 mov r1, #0x0
200 str r1, [r0]
201 mov r1, #0xff
202 str r1, [r0, #0x804]
203 str r1, [r0, #0x810]
204
205 ldr r0, =0xE2800000
206 str r1, [r0, #0x804]
207 str r1, [r0, #0x810]
208 str r1, [r0, #0x81C]
209
210 ldr r0, =0xE2900000
211 str r1, [r0, #0x804]
212 str r1, [r0, #0x810]
213
214 mov pc, lr
215#endif