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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / fbe76ae4e3bacd5183294488947ec148df28d55b / . / board / logicpd / imx27lite / lowlevel_init.S
blob: c286d0dfe10dd2d43466720fe79e16bfbd26ac04 [file] [log] [blame]
Ilya Yanok10bc2412009-08-11 02:32:09 +0400[diff] [blame]1/*
2 * For clock initialization, see chapter 3 of the "MCIMX27 Multimedia
3 * Applications Processor Reference Manual, Rev. 0.2".
4 *
5 * (C) Copyright 2008 Eric Jarrige <eric.jarrige@armadeus.org>
6 * (C) Copyright 2009 Ilya Yanok <yanok@emcraft.com>
7 *
Wolfgang Denk1a459662013-07-08 09:37:19 +0200[diff] [blame]8 * SPDX-License-Identifier: GPL-2.0+
Ilya Yanok10bc2412009-08-11 02:32:09 +0400[diff] [blame]9 */
10
11
12#include <config.h>
13#include <version.h>
14#include <asm/macro.h>
15#include <asm/arch/imx-regs.h>
Stefano Babica4814a62011-09-05 04:32:28 +0000[diff] [blame]16#include <generated/asm-offsets.h>
Ilya Yanok10bc2412009-08-11 02:32:09 +0400[diff] [blame]17
18SOC_ESDCTL_BASE_W: .word IMX_ESD_BASE
19SOC_SI_ID_REG_W: .word IMX_SYSTEM_CTL_BASE
20SDRAM_ESDCFG_T1_W: .word SDRAM_ESDCFG_REGISTER_VAL(0)
21SDRAM_ESDCFG_T2_W: .word SDRAM_ESDCFG_REGISTER_VAL(3)
22SDRAM_PRECHARGE_CMD_W: .word (ESDCTL_SDE | ESDCTL_SMODE_PRECHARGE | \
23 ESDCTL_ROW13 | ESDCTL_COL10)
24SDRAM_AUTOREF_CMD_W: .word (ESDCTL_SDE | ESDCTL_SMODE_AUTO_REF | \
25 ESDCTL_ROW13 | ESDCTL_COL10)
26SDRAM_LOADMODE_CMD_W: .word (ESDCTL_SDE | ESDCTL_SMODE_LOAD_MODE | \
27 ESDCTL_ROW13 | ESDCTL_COL10)
28SDRAM_NORMAL_CMD_W: .word SDRAM_ESDCTL_REGISTER_VAL
29
30.macro init_aipi
31 /*
32 * setup AIPI1 and AIPI2
33 */
34 write32 AIPI1_PSR0, AIPI1_PSR0_VAL
35 write32 AIPI1_PSR1, AIPI1_PSR1_VAL
36 write32 AIPI2_PSR0, AIPI2_PSR0_VAL
37 write32 AIPI2_PSR1, AIPI2_PSR1_VAL
38
39.endm /* init_aipi */
40
41.macro init_clock
42 ldr r0, =CSCR
43 /* disable MPLL/SPLL first */
44 ldr r1, [r0]
45 bic r1, r1, #(CSCR_MPEN|CSCR_SPEN)
46 str r1, [r0]
47
48 write32 MPCTL0, MPCTL0_VAL
49 write32 SPCTL0, SPCTL0_VAL
50
51 write32 CSCR, CSCR_VAL | CSCR_MPLL_RESTART | CSCR_SPLL_RESTART
52
53 /*
54 * add some delay here
55 */
56 wait_timer 0x1000
57
58 /* peripheral clock divider */
59 write32 PCDR0, PCDR0_VAL
60 write32 PCDR1, PCDR1_VAL
61
62 /* Configure PCCR0 and PCCR1 */
63 write32 PCCR0, PCCR0_VAL
64 write32 PCCR1, PCCR1_VAL
65
66.endm /* init_clock */
67
68.macro sdram_init
69 ldr r0, SOC_ESDCTL_BASE_W
70 mov r2, #PHYS_SDRAM_1
71
72 /* Do initial reset */
73 mov r1, #ESDMISC_MDDR_DL_RST
74 str r1, [r0, #ESDMISC_ROF]
75
76 /* Hold for more than 200ns */
77 wait_timer 0x10000
78
79 /* Activate LPDDR iface */
80 mov r1, #ESDMISC_MDDREN
81 str r1, [r0, #ESDMISC_ROF]
82
83 /* Check The chip version TO1 or TO2 */
84 ldr r1, SOC_SI_ID_REG_W
85 ldr r1, [r1]
86 ands r1, r1, #0xF0000000
87 /* add Latency on CAS only for TO2 */
88 ldreq r1, SDRAM_ESDCFG_T2_W
89 ldrne r1, SDRAM_ESDCFG_T1_W
90 str r1, [r0, #ESDCFG0_ROF]
91
92 /* Run initialization sequence */
93 ldr r1, SDRAM_PRECHARGE_CMD_W
94 str r1, [r0, #ESDCTL0_ROF]
95 ldr r1, [r2, #SDRAM_ALL_VAL]
96
97 ldr r1, SDRAM_AUTOREF_CMD_W
98 str r1, [r0, #ESDCTL0_ROF]
99 ldr r1, [r2, #SDRAM_ALL_VAL]
100 ldr r1, [r2, #SDRAM_ALL_VAL]
101
102 ldr r1, SDRAM_LOADMODE_CMD_W
103 str r1, [r0, #ESDCTL0_ROF]
104 ldrb r1, [r2, #SDRAM_MODE_REGISTER_VAL]
105 add r3, r2, #SDRAM_EXT_MODE_REGISTER_VAL
106 ldrb r1, [r3]
107
108 ldr r1, SDRAM_NORMAL_CMD_W
109 str r1, [r0, #ESDCTL0_ROF]
110
111#if (CONFIG_NR_DRAM_BANKS > 1)
112 /* 2nd sdram */
113 mov r2, #PHYS_SDRAM_2
114
115 /* Check The chip version TO1 or TO2 */
116 ldr r1, SOC_SI_ID_REG_W
117 ldr r1, [r1]
118 ands r1, r1, #0xF0000000
119 /* add Latency on CAS only for TO2 */
120 ldreq r1, SDRAM_ESDCFG_T2_W
121 ldrne r1, SDRAM_ESDCFG_T1_W
122 str r1, [r0, #ESDCFG1_ROF]
123
124 /* Run initialization sequence */
125 ldr r1, SDRAM_PRECHARGE_CMD_W
126 str r1, [r0, #ESDCTL1_ROF]
127 ldr r1, [r2, #SDRAM_ALL_VAL]
128
129 ldr r1, SDRAM_AUTOREF_CMD_W
130 str r1, [r0, #ESDCTL1_ROF]
131 ldr r1, [r2, #SDRAM_ALL_VAL]
132 ldr r1, [r2, #SDRAM_ALL_VAL]
133
134 ldr r1, SDRAM_LOADMODE_CMD_W
135 str r1, [r0, #ESDCTL1_ROF]
136 ldrb r1, [r2, #SDRAM_MODE_REGISTER_VAL]
137 add r3, r2, #SDRAM_EXT_MODE_REGISTER_VAL
138 ldrb r1, [r3]
139
140 ldr r1, SDRAM_NORMAL_CMD_W
141 str r1, [r0, #ESDCTL1_ROF]
142#endif /* CONFIG_NR_DRAM_BANKS > 1 */
143
144.endm /* sdram_init */
145
146.globl lowlevel_init
147lowlevel_init:
148
149 mov r10, lr
150
151 init_aipi
152
153 init_clock
154
155 sdram_init
156
157 mov pc,r10