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gerrit.cesnet.cz / github / trini / u-boot / 7d2f669b94aa42579b5d5775dfb076bce0102e3f / . / board / spear / common / spr_lowlevel_init.S
blob: 23a0369cbe8d2b21110a00cce700e281f468dc48 [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:
17 /* By default, U-Boot switches CPU to low-vector */
18 /* Revert this as we work in high vector even in U-Boot */
19 mrc p15, 0, r0, c1, c0, 0
20 orr r0, r0, #0x00002000
21 mcr p15, 0, r0, c1, c0, 0
22 mov pc, lr
23
24/* void setfreq(unsigned int device, unsigned int frequency) */
25.global setfreq
26setfreq:
27 stmfd sp!,{r14}
28 stmfd sp!,{r0-r12}
29
30 mov r8,sp
31 ldr sp,SRAM_STACK_V
32
33 /* Saving the function arguements for later use */
34 mov r4,r0
35 mov r5,r1
36
37 /* Putting DDR into self refresh */
38 ldr r0,DDR_07_V
39 ldr r1,[r0]
40 ldr r2,DDR_ACTIVE_V
41 bic r1, r1, r2
42 str r1,[r0]
43 ldr r0,DDR_57_V
44 ldr r1,[r0]
45 ldr r2,CYCLES_MASK_V
46 bic r1, r1, r2
47 ldr r2,REFRESH_CYCLES_V
48 orr r1, r1, r2, lsl #16
49 str r1,[r0]
50 ldr r0,DDR_07_V
51 ldr r1,[r0]
52 ldr r2,SREFRESH_MASK_V
53 orr r1, r1, r2
54 str r1,[r0]
55
56 /* flush pipeline */
57 b flush
58 .align 5
59flush:
60 /* Delay to ensure self refresh mode */
61 ldr r0,SREFRESH_DELAY_V
62delay:
63 sub r0,r0,#1
64 cmp r0,#0
65 bne delay
66
67 /* Putting system in slow mode */
68 ldr r0,SCCTRL_V
69 mov r1,#2
70 str r1,[r0]
71
72 /* Changing PLL(1/2) frequency */
73 mov r0,r4
74 mov r1,r5
75
76 cmp r4,#0
77 beq pll1_freq
78
79 /* Change PLL2 (DDR frequency) */
80 ldr r6,PLL2_FREQ_V
81 ldr r7,PLL2_CNTL_V
82 b pll2_freq
83
84pll1_freq:
85 /* Change PLL1 (CPU frequency) */
86 ldr r6,PLL1_FREQ_V
87 ldr r7,PLL1_CNTL_V
88
89pll2_freq:
90 mov r0,r6
91 ldr r1,[r0]
92 ldr r2,PLLFREQ_MASK_V
93 bic r1,r1,r2
94 mov r2,r5,lsr#1
95 orr r1,r1,r2,lsl#24
96 str r1,[r0]
97
98 mov r0,r7
99 ldr r1,P1C0A_V
100 str r1,[r0]
101 ldr r1,P1C0E_V
102 str r1,[r0]
103 ldr r1,P1C06_V
104 str r1,[r0]
105 ldr r1,P1C0E_V
106 str r1,[r0]
107
108lock:
109 ldr r1,[r0]
110 and r1,r1,#1
111 cmp r1,#0
112 beq lock
113
114 /* Putting system back to normal mode */
115 ldr r0,SCCTRL_V
116 mov r1,#4
117 str r1,[r0]
118
119 /* Putting DDR back to normal */
120 ldr r0,DDR_07_V
121 ldr r1,[R0]
122 ldr r2,SREFRESH_MASK_V
123 bic r1, r1, r2
124 str r1,[r0]
125 ldr r2,DDR_ACTIVE_V
126 orr r1, r1, r2
127 str r1,[r0]
128
129 /* Delay to ensure self refresh mode */
130 ldr r0,SREFRESH_DELAY_V
1311:
132 sub r0,r0,#1
133 cmp r0,#0
134 bne 1b
135
136 mov sp,r8
137 /* Resuming back to code */
138 ldmia sp!,{r0-r12}
139 ldmia sp!,{pc}
140
141SCCTRL_V:
142 .word 0xfca00000
143PLL1_FREQ_V:
144 .word 0xfca8000C
145PLL1_CNTL_V:
146 .word 0xfca80008
147PLL2_FREQ_V:
148 .word 0xfca80018
149PLL2_CNTL_V:
150 .word 0xfca80014
151PLLFREQ_MASK_V:
152 .word 0xff000000
153P1C0A_V:
154 .word 0x1C0A
155P1C0E_V:
156 .word 0x1C0E
157P1C06_V:
158 .word 0x1C06
159
160SREFRESH_DELAY_V:
161 .word 0x9999
162SRAM_STACK_V:
163 .word 0xD2800600
164DDR_07_V:
165 .word 0xfc60001c
166DDR_ACTIVE_V:
167 .word 0x01000000
168DDR_57_V:
169 .word 0xfc6000e4
170CYCLES_MASK_V:
171 .word 0xffff0000
172REFRESH_CYCLES_V:
173 .word 0xf0f0
174SREFRESH_MASK_V:
175 .word 0x00010000
176
177.global setfreq_sz
178setfreq_sz:
179 .word setfreq_sz - setfreq