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git01.mediatek.com / filogic / uboot / a3eff93e4f9ff1404f368c6798aa651f3e96f8a3 / . / arch / arm / mach-at91 / arm920t / lowlevel_init.S
blob: de99c616ac836581c7b3cdb59da5173ead1dce6d [file] [log] [blame]
Tom Rini10e47792018-05-06 17:58:06 -0400[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0+ */
Jens Scharsig9bbaae32010-02-03 22:47:35 +0100[diff] [blame]2/*
3 * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) and
4 * Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
5 *
6 * Modified for the at91rm9200dk board by
7 * (C) Copyright 2004
8 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
Jens Scharsig9bbaae32010-02-03 22:47:35 +0100[diff] [blame]9 */
10
11#include <config.h>
12
13#ifndef CONFIG_SKIP_LOWLEVEL_INIT
14
15#include <asm/arch/hardware.h>
16#include <asm/arch/at91_mc.h>
17#include <asm/arch/at91_pmc.h>
18#include <asm/arch/at91_pio.h>
19
20#define ARM920T_CONTROL 0xC0000000 /* @ set bit 31 (iA) and 30 (nF) */
21
22_MTEXT_BASE:
23#undef START_FROM_MEM
24#ifdef START_FROM_MEM
Wolfgang Denk0708bc62010-10-07 21:51:12 +0200[diff] [blame]25 .word CONFIG_SYS_TEXT_BASE-PHYS_FLASH_1
Jens Scharsig9bbaae32010-02-03 22:47:35 +0100[diff] [blame]26#else
Wolfgang Denk0708bc62010-10-07 21:51:12 +0200[diff] [blame]27 .word CONFIG_SYS_TEXT_BASE
Jens Scharsig9bbaae32010-02-03 22:47:35 +0100[diff] [blame]28#endif
29
30.globl lowlevel_init
31lowlevel_init:
32 ldr r1, =AT91_ASM_PMC_MOR
33 /* Main oscillator Enable register */
34#ifdef CONFIG_SYS_USE_MAIN_OSCILLATOR
35 ldr r0, =0x0000FF01 /* Enable main oscillator */
36#else
37 ldr r0, =0x0000FF00 /* Disable main oscillator */
38#endif
39 str r0, [r1] /*AT91C_CKGR_MOR] */
40 /* Add loop to compensate Main Oscillator startup time */
41 ldr r0, =0x00000010
42LoopOsc:
43 subs r0, r0, #1
44 bhi LoopOsc
45
46 /* memory control configuration */
47 /* this isn't very elegant, but what the heck */
48 ldr r0, =SMRDATA
49 ldr r1, _MTEXT_BASE
50 sub r0, r0, r1
Jens Scharsig36ff5f72010-12-18 02:30:04 +0000[diff] [blame]51 ldr r2, =SMRDATAE
52 sub r2, r2, r1
Jens Scharsig9bbaae32010-02-03 22:47:35 +0100[diff] [blame]53pllloop:
54 /* the address */
55 ldr r1, [r0], #4
56 /* the value */
57 ldr r3, [r0], #4
58 str r3, [r1]
59 cmp r2, r0
60 bne pllloop
61 /* delay - this is all done by guess */
62 ldr r0, =0x00010000
63 /* (vs reading PMC_SR for LOCKA, LOCKB ... or MOSCS earlier) */
64lock:
65 subs r0, r0, #1
66 bhi lock
67 ldr r0, =SMRDATA1
68 ldr r1, _MTEXT_BASE
69 sub r0, r0, r1
Jens Scharsig36ff5f72010-12-18 02:30:04 +0000[diff] [blame]70 ldr r2, =SMRDATA1E
71 sub r2, r2, r1
Jens Scharsig9bbaae32010-02-03 22:47:35 +0100[diff] [blame]72sdinit:
73 /* the address */
74 ldr r1, [r0], #4
75 /* the value */
76 ldr r3, [r0], #4
77 str r3, [r1]
78 cmp r2, r0
79 bne sdinit
80
81 /* switch from FastBus to Asynchronous clock mode */
82 mrc p15, 0, r0, c1, c0, 0
83 orr r0, r0, #ARM920T_CONTROL
84 mcr p15, 0, r0, c1, c0, 0
85
86 /* everything is fine now */
87 mov pc, lr
88
89 .ltorg
90
91SMRDATA:
92 .word AT91_ASM_MC_EBI_CFG
93 .word CONFIG_SYS_EBI_CFGR_VAL
94 .word AT91_ASM_MC_SMC_CSR0
95 .word CONFIG_SYS_SMC_CSR0_VAL
96 .word AT91_ASM_PMC_PLLAR
97 .word CONFIG_SYS_PLLAR_VAL
98 .word AT91_ASM_PMC_PLLBR
99 .word CONFIG_SYS_PLLBR_VAL
100 .word AT91_ASM_PMC_MCKR
101 .word CONFIG_SYS_MCKR_VAL
Jens Scharsig36ff5f72010-12-18 02:30:04 +0000[diff] [blame]102SMRDATAE:
Jens Scharsig9bbaae32010-02-03 22:47:35 +0100[diff] [blame]103 /* here there's a delay */
104SMRDATA1:
105 .word AT91_ASM_PIOC_ASR
106 .word CONFIG_SYS_PIOC_ASR_VAL
107 .word AT91_ASM_PIOC_BSR
108 .word CONFIG_SYS_PIOC_BSR_VAL
109 .word AT91_ASM_PIOC_PDR
110 .word CONFIG_SYS_PIOC_PDR_VAL
111 .word AT91_ASM_MC_EBI_CSA
112 .word CONFIG_SYS_EBI_CSA_VAL
113 .word AT91_ASM_MC_SDRAMC_CR
114 .word CONFIG_SYS_SDRC_CR_VAL
115 .word AT91_ASM_MC_SDRAMC_MR
116 .word CONFIG_SYS_SDRC_MR_VAL
117 .word CONFIG_SYS_SDRAM
118 .word CONFIG_SYS_SDRAM_VAL
119 .word AT91_ASM_MC_SDRAMC_MR
120 .word CONFIG_SYS_SDRC_MR_VAL1
121 .word CONFIG_SYS_SDRAM
122 .word CONFIG_SYS_SDRAM_VAL
123 .word CONFIG_SYS_SDRAM
124 .word CONFIG_SYS_SDRAM_VAL
125 .word CONFIG_SYS_SDRAM
126 .word CONFIG_SYS_SDRAM_VAL
127 .word CONFIG_SYS_SDRAM
128 .word CONFIG_SYS_SDRAM_VAL
129 .word CONFIG_SYS_SDRAM
130 .word CONFIG_SYS_SDRAM_VAL
131 .word CONFIG_SYS_SDRAM
132 .word CONFIG_SYS_SDRAM_VAL
133 .word CONFIG_SYS_SDRAM
134 .word CONFIG_SYS_SDRAM_VAL
135 .word CONFIG_SYS_SDRAM
136 .word CONFIG_SYS_SDRAM_VAL
137 .word AT91_ASM_MC_SDRAMC_MR
138 .word CONFIG_SYS_SDRC_MR_VAL2
139 .word CONFIG_SYS_SDRAM1
140 .word CONFIG_SYS_SDRAM_VAL
141 .word AT91_ASM_MC_SDRAMC_TR
142 .word CONFIG_SYS_SDRC_TR_VAL
143 .word CONFIG_SYS_SDRAM
144 .word CONFIG_SYS_SDRAM_VAL
145 .word AT91_ASM_MC_SDRAMC_MR
146 .word CONFIG_SYS_SDRC_MR_VAL3
147 .word CONFIG_SYS_SDRAM
148 .word CONFIG_SYS_SDRAM_VAL
Jens Scharsig36ff5f72010-12-18 02:30:04 +0000[diff] [blame]149SMRDATA1E:
Jens Scharsig9bbaae32010-02-03 22:47:35 +0100[diff] [blame]150 /* SMRDATA1 is 176 bytes long */
151#endif /* CONFIG_SKIP_LOWLEVEL_INIT */