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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / a9398e018593782c5fa7d0741955fc1256b34c1e / . / board / xsengine / lowlevel_init.S
blob: 309faabd921f327d841e8e918461475e5416a379 [file] [log] [blame]
wdenkca0e7742004-06-09 15:37:23 +0000[diff] [blame]1#include <config.h>
2#include <version.h>
3#include <asm/arch/pxa-regs.h>
4
5DRAM_SIZE: .long CFG_DRAM_SIZE
6
wdenk400558b2005-04-02 23:52:25 +0000[diff] [blame]7.globl lowlevel_init
8lowlevel_init:
wdenkca0e7742004-06-09 15:37:23 +0000[diff] [blame]9
10 mov r10, lr
11
12/* ---- GPIO INITIALISATION ---- */
13/* Set up GPIO pins first (3 groups [31:0] [63:32] [80:64]) */
14
15 /* General purpose set registers */
16 ldr r0, =GPSR0
17 ldr r1, =CFG_GPSR0_VAL
18 str r1, [r0]
19 ldr r0, =GPSR1
20 ldr r1, =CFG_GPSR1_VAL
21 str r1, [r0]
22 ldr r0, =GPSR2
23 ldr r1, =CFG_GPSR2_VAL
24 str r1, [r0]
25
26 /* General purpose clear registers */
27 ldr r0, =GPCR0
28 ldr r1, =CFG_GPCR0_VAL
29 str r1, [r0]
30 ldr r0, =GPCR1
31 ldr r1, =CFG_GPCR1_VAL
32 str r1, [r0]
33 ldr r0, =GPCR2
34 ldr r1, =CFG_GPCR2_VAL
35 str r1, [r0]
36
37 /* General rising edge registers */
38 ldr r0, =GRER0
39 ldr r1, =CFG_GRER0_VAL
40 str r1, [r0]
41 ldr r0, =GRER1
42 ldr r1, =CFG_GRER1_VAL
43 str r1, [r0]
44 ldr r0, =GRER2
45 ldr r1, =CFG_GRER2_VAL
46 str r1, [r0]
47
48 /* General falling edge registers */
49 ldr r0, =GFER0
50 ldr r1, =CFG_GFER0_VAL
51 str r1, [r0]
52 ldr r0, =GFER1
53 ldr r1, =CFG_GFER1_VAL
54 str r1, [r0]
55 ldr r0, =GFER2
56 ldr r1, =CFG_GFER2_VAL
57 str r1, [r0]
58
59 /* General edge detect registers */
60 ldr r0, =GPDR0
61 ldr r1, =CFG_GPDR0_VAL
62 str r1, [r0]
63 ldr r0, =GPDR1
64 ldr r1, =CFG_GPDR1_VAL
65 str r1, [r0]
66 ldr r0, =GPDR2
67 ldr r1, =CFG_GPDR2_VAL
68 str r1, [r0]
69
70 /* General alternate function registers */
71 ldr r0, =GAFR0_L /* [0:15] */
72 ldr r1, =CFG_GAFR0_L_VAL
73 str r1, [r0]
74 ldr r0, =GAFR0_U /* [31:16] */
75 ldr r1, =CFG_GAFR0_U_VAL
76 str r1, [r0]
77 ldr r0, =GAFR1_L /* [47:32] */
78 ldr r1, =CFG_GAFR1_L_VAL
79 str r1, [r0]
80 ldr r0, =GAFR1_U /* [63:48] */
81 ldr r1, =CFG_GAFR1_U_VAL
82 str r1, [r0]
83 ldr r0, =GAFR2_L /* [79:64] */
84 ldr r1, =CFG_GAFR2_L_VAL
85 str r1, [r0]
86 ldr r0, =GAFR2_U /* [80] */
87 ldr r1, =CFG_GAFR2_U_VAL
88 str r1, [r0]
89
90 /* General purpose direction registers */
91 ldr r0, =GPDR0
92 ldr r1, =CFG_GPDR0_VAL
93 str r1, [r0]
94 ldr r0, =GPDR1
95 ldr r1, =CFG_GPDR1_VAL
96 str r1, [r0]
97 ldr r0, =GPDR2
98 ldr r1, =CFG_GPDR2_VAL
99 str r1, [r0]
100
101 /* Power manager sleep status */
102 ldr r0, =PSSR
103 ldr r1, =CFG_PSSR_VAL
104 str r1, [r0]
105
106/* ---- MEMORY INITIALISATION ---- */
107/* Initialize Memory Controller, see PXA250 Operating System Developer's Guide */
108/* pause for 200 uSecs- allow internal clocks to settle */
109 ldr r3, =OSCR /* reset the OS Timer Count to zero */
110 mov r2, #0
111 str r2, [r3]
112 ldr r4, =0x300 /* really 0x2E1 is about 200usec, so 0x300 should be plenty */
1131:
114 ldr r2, [r3]
115 cmp r4, r2
116 bgt 1b
117
118mem_init:
119/* get memory controller base address */
120 ldr r1, =MEMC_BASE
121
122/* ---- FLASH INITIALISATION ---- */
123/* Write MSC0 and read back to ensure data change is accepted by cpu */
124 ldr r2, =CFG_MSC0_VAL
125 str r2, [r1, #MSC0_OFFSET]
126 ldr r2, [r1, #MSC0_OFFSET]
127
128/* ---- SDRAM INITIALISATION ---- */
129/* get the MDREFR settings */
130 ldr r2, =CFG_MDREFR_VAL
131 str r2, [r1, #MDREFR_OFFSET]
132
133/* fetch platform value of MDCNFG */
134 ldr r2, =CFG_MDCNFG_VAL
135
136/* disable all sdram banks */
137 bic r2, r2, #(MDCNFG_DE0 | MDCNFG_DE1)
138 bic r2, r2, #(MDCNFG_DE2 | MDCNFG_DE3)
139
140/* write initial value of MDCNFG, w/o enabling sdram banks */
141 str r2, [r1, #MDCNFG_OFFSET]
142
143/* pause for 200 uSecs */
144 ldr r3, =OSCR /* reset the OS Timer Count to zero */
145 mov r2, #0
146 str r2, [r3]
147 ldr r4, =0x300 /* about 200 usec */
1481:
149 ldr r2, [r3]
150 cmp r4, r2
151 bgt 1b
152
153/* Access memory *not yet enabled* for CBR refresh cycles (8) */
154/* CBR is generated for all banks */
155
156 ldr r2, =CFG_DRAM_BASE
157 str r2, [r2]
158 str r2, [r2]
159 str r2, [r2]
160 str r2, [r2]
161 str r2, [r2]
162 str r2, [r2]
163 str r2, [r2]
164 str r2, [r2]
165
166/* get memory controller base address */
167 ldr r2, =MEMC_BASE
168
169/* Enable SDRAM bank 0 in MDCNFG register */
170 ldr r2, [r1, #MDCNFG_OFFSET]
171 orr r2, r2, #MDCNFG_DE0
172 str r2, [r1, #MDCNFG_OFFSET]
173
174/* write MDMRS to trigger an MSR command to all enabled SDRAM banks */
175 ldr r2, =CFG_MDMRS_VAL
176 str r2, [r1, #MDMRS_OFFSET]
177
178/* ---- INTERRUPT INITIALISATION ---- */
179/* Disable (mask) all interrupts at the interrupt controller */
180/* clear the interrupt level register (use IRQ, not FIQ) */
181 mov r1, #0
182 ldr r2, =ICLR
183 str r1, [r2]
184
185/* Set interrupt mask register */
186 ldr r1, =CFG_ICMR_VAL
187 ldr r2, =ICMR
188 str r1, [r2]
189
190/* ---- CLOCK INITIALISATION ---- */
191/* Disable the peripheral clocks, and set the core clock */
192
193/* Turn Off ALL on-chip peripheral clocks for re-configuration */
194 ldr r1, =CKEN
195 mov r2, #0
196 str r2, [r1]
197
198/* set core clocks */
199 ldr r2, =CFG_CCCR_VAL
200 ldr r1, =CCCR
201 str r2, [r1]
202
203#ifdef ENABLE32KHZ
204/* enable the 32Khz oscillator for RTC and PowerManager */
205 ldr r1, =OSCC
206 mov r2, #OSCC_OON
207 str r2, [r1]
208
209/* NOTE: spin here until OSCC.OOK get set, meaning the PLL has settled. */
21060:
211 ldr r2, [r1]
212 ands r2, r2, #1
213 beq 60b
214#endif
215
216/* Turn on needed clocks */
217 ldr r1, =CKEN
218 ldr r2, =CFG_CKEN_VAL
219 str r2, [r1]
220
221 mov pc, r10