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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This file contains the CPU initialization code.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include "hardware.h"
#include "common.h"
static int mx5_cpu_rev = -1;
#define IIM_SREV 0x24
static u32 imx5_read_srev_reg(const char *compat)
{
void __iomem *iim_base;
struct device_node *np;
u32 srev;
np = of_find_compatible_node(NULL, NULL, compat);
iim_base = of_iomap(np, 0);
of_node_put(np);
WARN_ON(!iim_base);
srev = readl(iim_base + IIM_SREV) & 0xff;
iounmap(iim_base);
return srev;
}
static int get_mx51_srev(void)
{
u32 rev = imx5_read_srev_reg("fsl,imx51-iim");
switch (rev) {
case 0x0:
return IMX_CHIP_REVISION_2_0;
case 0x10:
return IMX_CHIP_REVISION_3_0;
default:
return IMX_CHIP_REVISION_UNKNOWN;
}
}
/*
* Returns:
* the silicon revision of the cpu
*/
int mx51_revision(void)
{
if (mx5_cpu_rev == -1)
mx5_cpu_rev = get_mx51_srev();
return mx5_cpu_rev;
}
EXPORT_SYMBOL(mx51_revision);
#ifdef CONFIG_NEON
/*
* All versions of the silicon before Rev. 3 have broken NEON implementations.
* Dependent on link order - so the assumption is that vfp_init is called
* before us.
*/
int __init mx51_neon_fixup(void)
{
if (mx51_revision() < IMX_CHIP_REVISION_3_0 &&
(elf_hwcap & HWCAP_NEON)) {
elf_hwcap &= ~HWCAP_NEON;
pr_info("Turning off NEON support, detected broken NEON implementation\n");
}
return 0;
}
#endif
static int get_mx53_srev(void)
{
u32 rev = imx5_read_srev_reg("fsl,imx53-iim");
switch (rev) {
case 0x0:
return IMX_CHIP_REVISION_1_0;
case 0x2:
return IMX_CHIP_REVISION_2_0;
case 0x3:
return IMX_CHIP_REVISION_2_1;
default:
return IMX_CHIP_REVISION_UNKNOWN;
}
}
/*
* Returns:
* the silicon revision of the cpu
*/
int mx53_revision(void)
{
if (mx5_cpu_rev == -1)
mx5_cpu_rev = get_mx53_srev();
return mx5_cpu_rev;
}
EXPORT_SYMBOL(mx53_revision);
#define ARM_GPC 0x4
#define DBGEN BIT(16)
/*
* This enables the DBGEN bit in ARM_GPC register, which is
* required for accessing some performance counter features.
* Technically it is only required while perf is used, but to
* keep the source code simple we just enable it all the time
* when the kernel configuration allows using the feature.
*/
void __init imx5_pmu_init(void)
{
void __iomem *tigerp_base;
struct device_node *np;
u32 gpc;
if (!IS_ENABLED(CONFIG_ARM_PMU))
return;
np = of_find_compatible_node(NULL, NULL, "arm,cortex-a8-pmu");
if (!np)
return;
if (!of_property_read_bool(np, "secure-reg-access"))
goto exit;
of_node_put(np);
np = of_find_compatible_node(NULL, NULL, "fsl,imx51-tigerp");
if (!np)
return;
tigerp_base = of_iomap(np, 0);
if (!tigerp_base)
goto exit;
gpc = readl_relaxed(tigerp_base + ARM_GPC);
gpc |= DBGEN;
writel_relaxed(gpc, tigerp_base + ARM_GPC);
iounmap(tigerp_base);
exit:
of_node_put(np);
}
|
