summaryrefslogtreecommitdiff
path: root/arch/arm/cpu/arm926ejs/at91/lowlevel_init.S
blob: 39de2f4904381c65baaa948ac31f9f81562e5985 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
 * Memory Setup stuff - taken from blob memsetup.S
 *
 * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) and
 *		       Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
 *
 * Copyright (C) 2008 Ronetix Ilko Iliev (www.ronetix.at)
 * Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+ 
 */

#include <config.h>
#include <asm/arch/hardware.h>
#include <asm/arch/at91_pmc.h>
#include <asm/arch/at91_wdt.h>
#include <asm/arch/at91_pio.h>
#include <asm/arch/at91_matrix.h>
#include <asm/arch/at91sam9_sdramc.h>
#include <asm/arch/at91sam9_smc.h>
#include <asm/arch/at91_rstc.h>
#ifdef CONFIG_ATMEL_LEGACY
#include <asm/arch/at91sam9_matrix.h>
#endif
#ifndef CONFIG_SYS_MATRIX_EBICSA_VAL
#define CONFIG_SYS_MATRIX_EBICSA_VAL CONFIG_SYS_MATRIX_EBI0CSA_VAL
#endif

_TEXT_BASE:
	.word	CONFIG_SYS_TEXT_BASE

.globl lowlevel_init
.type lowlevel_init,function
lowlevel_init:

	mov	r5, pc		/* r5 = POS1 + 4 current */
POS1:
	ldr	r0, =POS1	/* r0 = POS1 compile */
	ldr	r2, _TEXT_BASE
	sub	r0, r0, r2	/* r0 = POS1-_TEXT_BASE (POS1 relative) */
	sub	r5, r5, r0	/* r0 = CONFIG_SYS_TEXT_BASE-1 */
	sub	r5, r5, #4	/* r1 = text base - current */

	/* memory control configuration 1 */
	ldr	r0, =SMRDATA
	ldr	r2, =SMRDATA1
	ldr	r1, _TEXT_BASE
	sub	r0, r0, r1
	sub	r2, r2, r1
	add	r0, r0, r5
	add	r2, r2, r5
0:
	/* the address */
	ldr	r1, [r0], #4
	/* the value */
	ldr	r3, [r0], #4
	str	r3, [r1]
	cmp	r2, r0
	bne	0b

/* ----------------------------------------------------------------------------
 * PMC Init Step 1.
 * ----------------------------------------------------------------------------
 * - Check if the PLL is already initialized
 * ----------------------------------------------------------------------------
 */
	ldr	r1, =(AT91_ASM_PMC_MCKR)
	ldr	r0, [r1]
	and	r0, r0, #3
	cmp	r0, #0
	bne	PLL_setup_end

/* ---------------------------------------------------------------------------
 * - Enable the Main Oscillator
 * ---------------------------------------------------------------------------
 */
	ldr	r1, =(AT91_ASM_PMC_MOR)
	ldr	r2, =(AT91_ASM_PMC_SR)
	/* Main oscillator Enable register PMC_MOR: */
	ldr	r0, =CONFIG_SYS_MOR_VAL
	str	r0, [r1]

	/* Reading the PMC Status to detect when the Main Oscillator is enabled */
	mov	r4, #AT91_PMC_IXR_MOSCS
MOSCS_Loop:
	ldr	r3, [r2]
	and	r3, r4, r3
	cmp	r3, #AT91_PMC_IXR_MOSCS
	bne	MOSCS_Loop

/* ----------------------------------------------------------------------------
 * PMC Init Step 2.
 * ----------------------------------------------------------------------------
 * Setup PLLA
 * ----------------------------------------------------------------------------
 */
	ldr	r1, =(AT91_ASM_PMC_PLLAR)
	ldr	r0, =CONFIG_SYS_PLLAR_VAL
	str	r0, [r1]

	/* Reading the PMC Status register to detect when the PLLA is locked */
	mov	r4, #AT91_PMC_IXR_LOCKA
MOSCS_Loop1:
	ldr	r3, [r2]
	and	r3, r4, r3
	cmp	r3, #AT91_PMC_IXR_LOCKA
	bne	MOSCS_Loop1

/* ----------------------------------------------------------------------------
 * PMC Init Step 3.
 * ----------------------------------------------------------------------------
 * - Switch on the Main Oscillator
 * ----------------------------------------------------------------------------
 */
	ldr	r1, =(AT91_ASM_PMC_MCKR)

	/* -Master Clock Controller register PMC_MCKR */
	ldr	r0, =CONFIG_SYS_MCKR1_VAL
	str	r0, [r1]

	/* Reading the PMC Status to detect when the Master clock is ready */
	mov	r4, #AT91_PMC_IXR_MCKRDY
MCKRDY_Loop:
	ldr	r3, [r2]
	and	r3, r4, r3
	cmp	r3, #AT91_PMC_IXR_MCKRDY
	bne	MCKRDY_Loop

	ldr	r0, =CONFIG_SYS_MCKR2_VAL
	str	r0, [r1]

	/* Reading the PMC Status to detect when the Master clock is ready */
	mov	r4, #AT91_PMC_IXR_MCKRDY
MCKRDY_Loop1:
	ldr	r3, [r2]
	and	r3, r4, r3
	cmp	r3, #AT91_PMC_IXR_MCKRDY
	bne	MCKRDY_Loop1
PLL_setup_end:

/* ----------------------------------------------------------------------------
 * - memory control configuration 2
 * ----------------------------------------------------------------------------
 */
	ldr	r0, =(AT91_ASM_SDRAMC_TR)
	ldr	r1, [r0]
	cmp	r1, #0
	bne	SDRAM_setup_end

	ldr	r0, =SMRDATA1
	ldr	r2, =SMRDATA2
	ldr	r1, _TEXT_BASE
	sub	r0, r0, r1
	sub	r2, r2, r1
	add	r0, r0, r5
	add	r2, r2, r5
2:
	/* the address */
	ldr	r1, [r0], #4
	/* the value */
	ldr	r3, [r0], #4
	str	r3, [r1]
	cmp	r2, r0
	bne	2b

SDRAM_setup_end:
	/* everything is fine now */
	mov	pc, lr

	.ltorg

SMRDATA:
	.word AT91_ASM_WDT_MR
	.word CONFIG_SYS_WDTC_WDMR_VAL
	/* configure PIOx as EBI0 D[16-31] */
#if defined(CONFIG_AT91SAM9263)
	.word AT91_ASM_PIOD_PDR
	.word CONFIG_SYS_PIOD_PDR_VAL1
	.word AT91_ASM_PIOD_PUDR
	.word CONFIG_SYS_PIOD_PPUDR_VAL
	.word AT91_ASM_PIOD_ASR
	.word CONFIG_SYS_PIOD_PPUDR_VAL
#elif defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9261) \
	|| defined(CONFIG_AT91SAM9G20)
	.word AT91_ASM_PIOC_PDR
	.word CONFIG_SYS_PIOC_PDR_VAL1
	.word AT91_ASM_PIOC_PUDR
	.word CONFIG_SYS_PIOC_PPUDR_VAL
#endif
	.word AT91_ASM_MATRIX_CSA0
	.word CONFIG_SYS_MATRIX_EBICSA_VAL

	/* flash */
	.word AT91_ASM_SMC_MODE0
	.word CONFIG_SYS_SMC0_MODE0_VAL

	.word AT91_ASM_SMC_CYCLE0
	.word CONFIG_SYS_SMC0_CYCLE0_VAL

	.word AT91_ASM_SMC_PULSE0
	.word CONFIG_SYS_SMC0_PULSE0_VAL

	.word AT91_ASM_SMC_SETUP0
	.word CONFIG_SYS_SMC0_SETUP0_VAL

SMRDATA1:
	.word AT91_ASM_SDRAMC_MR
	.word CONFIG_SYS_SDRC_MR_VAL1
	.word AT91_ASM_SDRAMC_TR
	.word CONFIG_SYS_SDRC_TR_VAL1
	.word AT91_ASM_SDRAMC_CR
	.word CONFIG_SYS_SDRC_CR_VAL
	.word AT91_ASM_SDRAMC_MDR
	.word CONFIG_SYS_SDRC_MDR_VAL
	.word AT91_ASM_SDRAMC_MR
	.word CONFIG_SYS_SDRC_MR_VAL2
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL1
	.word AT91_ASM_SDRAMC_MR
	.word CONFIG_SYS_SDRC_MR_VAL3
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL2
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL3
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL4
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL5
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL6
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL7
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL8
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL9
	.word AT91_ASM_SDRAMC_MR
	.word CONFIG_SYS_SDRC_MR_VAL4
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL10
	.word AT91_ASM_SDRAMC_MR
	.word CONFIG_SYS_SDRC_MR_VAL5
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL11
	.word AT91_ASM_SDRAMC_TR
	.word CONFIG_SYS_SDRC_TR_VAL2
	.word CONFIG_SYS_SDRAM_BASE
	.word CONFIG_SYS_SDRAM_VAL12
	/* User reset enable*/
	.word AT91_ASM_RSTC_MR
	.word CONFIG_SYS_RSTC_RMR_VAL
#ifdef CONFIG_SYS_MATRIX_MCFG_REMAP
	/* MATRIX_MCFG - REMAP all masters */
	.word AT91_ASM_MATRIX_MCFG
	.word 0x1FF
#endif
SMRDATA2:
	.word 0