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gerrit.cesnet.cz / github / trini / u-boot / 0edd82e2448d4aa8f729ac1df8bb55121388a069 / . / board / spear / common / spr_lowlevel_init.S
blob: 649488399a6a292345b976811f2b7c8e31dd9a50 [file] [log] [blame]
Vipin KUMAR566c9c12010-01-15 19:15:48 +0530[diff] [blame]1/*
2 * (C) Copyright 2006
3 * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
4 *
Wolfgang Denk1a459662013-07-08 09:37:19 +0200[diff] [blame]5 * SPDX-License-Identifier: GPL-2.0+
Vipin KUMAR566c9c12010-01-15 19:15:48 +0530[diff] [blame]6 */
7
8#include <config.h>
9
10/*
11 * platform specific initializations are already done in Xloader
12 * Initializations already done include
13 * DDR, PLLs, IP's clock enable and reset release etc
14 */
15.globl lowlevel_init
16lowlevel_init:
Vipin KUMAR566c9c12010-01-15 19:15:48 +0530[diff] [blame]17 mov pc, lr
18
19/* void setfreq(unsigned int device, unsigned int frequency) */
20.global setfreq
21setfreq:
22 stmfd sp!,{r14}
23 stmfd sp!,{r0-r12}
24
25 mov r8,sp
26 ldr sp,SRAM_STACK_V
27
28 /* Saving the function arguements for later use */
29 mov r4,r0
30 mov r5,r1
31
32 /* Putting DDR into self refresh */
33 ldr r0,DDR_07_V
34 ldr r1,[r0]
35 ldr r2,DDR_ACTIVE_V
36 bic r1, r1, r2
37 str r1,[r0]
38 ldr r0,DDR_57_V
39 ldr r1,[r0]
40 ldr r2,CYCLES_MASK_V
41 bic r1, r1, r2
42 ldr r2,REFRESH_CYCLES_V
43 orr r1, r1, r2, lsl #16
44 str r1,[r0]
45 ldr r0,DDR_07_V
46 ldr r1,[r0]
47 ldr r2,SREFRESH_MASK_V
48 orr r1, r1, r2
49 str r1,[r0]
50
51 /* flush pipeline */
52 b flush
53 .align 5
54flush:
55 /* Delay to ensure self refresh mode */
56 ldr r0,SREFRESH_DELAY_V
57delay:
58 sub r0,r0,#1
59 cmp r0,#0
60 bne delay
61
62 /* Putting system in slow mode */
63 ldr r0,SCCTRL_V
64 mov r1,#2
65 str r1,[r0]
66
67 /* Changing PLL(1/2) frequency */
68 mov r0,r4
69 mov r1,r5
70
71 cmp r4,#0
72 beq pll1_freq
73
74 /* Change PLL2 (DDR frequency) */
75 ldr r6,PLL2_FREQ_V
76 ldr r7,PLL2_CNTL_V
77 b pll2_freq
78
79pll1_freq:
80 /* Change PLL1 (CPU frequency) */
81 ldr r6,PLL1_FREQ_V
82 ldr r7,PLL1_CNTL_V
83
84pll2_freq:
85 mov r0,r6
86 ldr r1,[r0]
87 ldr r2,PLLFREQ_MASK_V
88 bic r1,r1,r2
89 mov r2,r5,lsr#1
90 orr r1,r1,r2,lsl#24
91 str r1,[r0]
92
93 mov r0,r7
94 ldr r1,P1C0A_V
95 str r1,[r0]
96 ldr r1,P1C0E_V
97 str r1,[r0]
98 ldr r1,P1C06_V
99 str r1,[r0]
100 ldr r1,P1C0E_V
101 str r1,[r0]
102
103lock:
104 ldr r1,[r0]
105 and r1,r1,#1
106 cmp r1,#0
107 beq lock
108
109 /* Putting system back to normal mode */
110 ldr r0,SCCTRL_V
111 mov r1,#4
112 str r1,[r0]
113
114 /* Putting DDR back to normal */
115 ldr r0,DDR_07_V
116 ldr r1,[R0]
117 ldr r2,SREFRESH_MASK_V
118 bic r1, r1, r2
119 str r1,[r0]
120 ldr r2,DDR_ACTIVE_V
121 orr r1, r1, r2
122 str r1,[r0]
123
124 /* Delay to ensure self refresh mode */
125 ldr r0,SREFRESH_DELAY_V
1261:
127 sub r0,r0,#1
128 cmp r0,#0
129 bne 1b
130
131 mov sp,r8
132 /* Resuming back to code */
133 ldmia sp!,{r0-r12}
134 ldmia sp!,{pc}
135
136SCCTRL_V:
137 .word 0xfca00000
138PLL1_FREQ_V:
139 .word 0xfca8000C
140PLL1_CNTL_V:
141 .word 0xfca80008
142PLL2_FREQ_V:
143 .word 0xfca80018
144PLL2_CNTL_V:
145 .word 0xfca80014
146PLLFREQ_MASK_V:
147 .word 0xff000000
148P1C0A_V:
149 .word 0x1C0A
150P1C0E_V:
151 .word 0x1C0E
152P1C06_V:
153 .word 0x1C06
154
155SREFRESH_DELAY_V:
156 .word 0x9999
157SRAM_STACK_V:
158 .word 0xD2800600
159DDR_07_V:
160 .word 0xfc60001c
161DDR_ACTIVE_V:
162 .word 0x01000000
163DDR_57_V:
164 .word 0xfc6000e4
165CYCLES_MASK_V:
166 .word 0xffff0000
167REFRESH_CYCLES_V:
168 .word 0xf0f0
169SREFRESH_MASK_V:
170 .word 0x00010000
171
172.global setfreq_sz
173setfreq_sz:
174 .word setfreq_sz - setfreq