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gerrit.cesnet.cz / github / trini / u-boot / 8a2bd215a26baf73f06ad64f0ac276f8172cd3d8 / . / arch / arm / cpu / armv7 / u8500 / cpu.c
blob: d8634bebbdf759286137b2bc17390cf92229c3cf [file] [log] [blame]
Mathieu J. Poirier9652de72012-07-31 08:59:25 +0000[diff] [blame]1/*
2 * Copyright (C) 2012 Linaro Limited
3 * Mathieu Poirier <mathieu.poirier@linaro.org>
4 *
5 * Based on original code from Joakim Axelsson at ST-Ericsson
6 * (C) Copyright 2010 ST-Ericsson
7 *
Wolfgang Denk1a459662013-07-08 09:37:19 +0200[diff] [blame]8 * SPDX-License-Identifier: GPL-2.0+
Mathieu J. Poirier9652de72012-07-31 08:59:25 +0000[diff] [blame]9 */
10
11#include <common.h>
12#include <asm/io.h>
13#include <asm/arch/prcmu.h>
Mathieu J. Poirier81637e22012-07-31 08:59:26 +0000[diff] [blame]14#include <asm/arch/clock.h>
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]15#include <asm/arch/hardware.h>
16
17#include <asm/arch/hardware.h>
18
19#define CPUID_DB8500V1 0x411fc091
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]20#define CPUID_DB8500V2 0x412fc091
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]21#define ASICID_DB8500V11 0x008500A1
22
Mathieu J. Poirierf4185972012-07-31 08:59:33 +0000[diff] [blame]23#define CACHE_CONTR_BASE 0xA0412000
24/* Cache controller register offsets
25 * as found in ARM's technical reference manual
26 */
27#define CACHE_INVAL_BY_WAY (CACHE_CONTR_BASE + 0x77C)
28#define CACHE_LOCKDOWN_BY_D (CACHE_CONTR_BASE + 0X900)
29#define CACHE_LOCKDOWN_BY_I (CACHE_CONTR_BASE + 0X904)
30
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]31static unsigned int read_asicid(void);
32
33static inline unsigned int read_cpuid(void)
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]34{
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]35 unsigned int val;
36
37 /* Main ID register (MIDR) */
38 asm("mrc p15, 0, %0, c0, c0, 0"
39 : "=r" (val)
40 :
41 : "cc");
42
43 return val;
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]44}
45
46static int cpu_is_u8500v11(void)
47{
48 return read_asicid() == ASICID_DB8500V11;
49}
Mathieu J. Poirier9652de72012-07-31 08:59:25 +0000[diff] [blame]50
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]51static int cpu_is_u8500v2(void)
52{
53 return read_cpuid() == CPUID_DB8500V2;
54}
55
56static unsigned int read_asicid(void)
57{
58 unsigned int *address;
59
60 if (cpu_is_u8500v2())
61 address = (void *) U8500_ASIC_ID_LOC_V2;
62 else
63 address = (void *) U8500_ASIC_ID_LOC_ED_V1;
64
65 return readl(address);
66}
67
Mathieu J. Poirierf4185972012-07-31 08:59:33 +0000[diff] [blame]68void cpu_cache_initialization(void)
69{
70 unsigned int value;
71 /* invalidate all cache entries */
72 writel(0xFFFF, CACHE_INVAL_BY_WAY);
73
74 /* ways are set to '0' when they are totally
75 * cleaned and invalidated
76 */
77 do {
78 value = readl(CACHE_INVAL_BY_WAY);
79 } while (value & 0xFF);
80
81 /* Invalidate register 9 D and I lockdown */
82 writel(0xFF, CACHE_LOCKDOWN_BY_D);
83 writel(0xFF, CACHE_LOCKDOWN_BY_I);
84}
85
Mathieu J. Poirier9652de72012-07-31 08:59:25 +0000[diff] [blame]86#ifdef CONFIG_ARCH_CPU_INIT
87/*
88 * SOC specific cpu init
89 */
90int arch_cpu_init(void)
91{
92 db8500_prcmu_init();
Mathieu J. Poirier81637e22012-07-31 08:59:26 +0000[diff] [blame]93 db8500_clocks_init();
Mathieu J. Poirier9652de72012-07-31 08:59:25 +0000[diff] [blame]94
95 return 0;
96}
97#endif /* CONFIG_ARCH_CPU_INIT */
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]98
99#ifdef CONFIG_MMC
100
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]101int u8500_mmc_power_init(void)
102{
103 int ret;
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]104 int enable, voltage;
105 int ab8500_revision;
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]106
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]107 if (!cpu_is_u8500v11() && !cpu_is_u8500v2())
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]108 return 0;
109
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]110 /* Get AB8500 revision */
111 ret = ab8500_read(AB8500_MISC, AB8500_REV_REG);
112 if (ret < 0)
113 goto out;
114
115 ab8500_revision = ret;
116
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]117 /*
118 * On v1.1 HREF boards (HREF+), Vaux3 needs to be enabled for the SD
119 * card to work. This is done by enabling the regulators in the AB8500
120 * via PRCMU I2C transactions.
121 *
122 * This code is derived from the handling of AB8500_LDO_VAUX3 in
123 * ab8500_ldo_enable() and ab8500_ldo_disable() in Linux.
124 *
125 * Turn off and delay is required to have it work across soft reboots.
126 */
127
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]128 /* Turn off (read-modify-write) */
129 ret = ab8500_read(AB8500_REGU_CTRL2,
130 AB8500_REGU_VRF1VAUX3_REGU_REG);
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]131 if (ret < 0)
132 goto out;
133
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]134 enable = ret;
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]135
136 /* Turn off */
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]137 ret = ab8500_write(AB8500_REGU_CTRL2,
138 AB8500_REGU_VRF1VAUX3_REGU_REG,
139 enable & ~LDO_VAUX3_ENABLE_MASK);
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]140 if (ret < 0)
141 goto out;
142
143 udelay(10 * 1000);
144
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]145 /* Set the voltage to 2.91 V or 2.9 V without overriding VRF1 value */
146 ret = ab8500_read(AB8500_REGU_CTRL2,
147 AB8500_REGU_VRF1VAUX3_SEL_REG);
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]148 if (ret < 0)
149 goto out;
150
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]151 voltage = ret;
152
153 if (ab8500_revision < 0x20) {
154 voltage &= ~LDO_VAUX3_SEL_MASK;
155 voltage |= LDO_VAUX3_SEL_2V9;
156 } else {
157 voltage &= ~LDO_VAUX3_V2_SEL_MASK;
158 voltage |= LDO_VAUX3_V2_SEL_2V91;
159 }
160
161 ret = ab8500_write(AB8500_REGU_CTRL2,
162 AB8500_REGU_VRF1VAUX3_SEL_REG, voltage);
163 if (ret < 0)
164 goto out;
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]165
166 /* Turn on the supply */
Mathieu J. Poirier75dfe962012-07-31 08:59:30 +0000[diff] [blame]167 enable &= ~LDO_VAUX3_ENABLE_MASK;
168 enable |= LDO_VAUX3_ENABLE_VAL;
169
170 ret = ab8500_write(AB8500_REGU_CTRL2,
171 AB8500_REGU_VRF1VAUX3_REGU_REG, enable);
Mathieu J. Poirier1e373222012-07-31 08:59:29 +0000[diff] [blame]172
173out:
174 return ret;
175}
176#endif /* CONFIG_MMC */