summaryrefslogtreecommitdiff
path: root/drivers/soc/imx/soc-imx8.c
blob: b9831576dd252b16757b075da1248000733d3c14 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2019 NXP.
 */

#include <linux/init.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/platform_device.h>
#include <linux/of.h>

#define REV_B1				0x21

#define IMX8MQ_SW_INFO_B1		0x40
#define IMX8MQ_SW_MAGIC_B1		0xff0055aa

#define OCOTP_UID_LOW			0x410
#define OCOTP_UID_HIGH			0x420

/* Same as ANADIG_DIGPROG_IMX7D */
#define ANADIG_DIGPROG_IMX8MM	0x800

struct imx8_soc_data {
	char *name;
	u32 (*soc_revision)(void);
};

static u64 soc_uid;

static ssize_t soc_uid_show(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%016llX\n", soc_uid);
}

static DEVICE_ATTR_RO(soc_uid);

static u32 __init imx8mq_soc_revision(void)
{
	struct device_node *np;
	void __iomem *ocotp_base;
	u32 magic;
	u32 rev = 0;

	np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp");
	if (!np)
		goto out;

	ocotp_base = of_iomap(np, 0);
	WARN_ON(!ocotp_base);

	magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1);
	if (magic == IMX8MQ_SW_MAGIC_B1)
		rev = REV_B1;

	soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
	soc_uid <<= 32;
	soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);

	iounmap(ocotp_base);

out:
	of_node_put(np);
	return rev;
}

static void __init imx8mm_soc_uid(void)
{
	void __iomem *ocotp_base;
	struct device_node *np;

	np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-ocotp");
	if (!np)
		return;

	ocotp_base = of_iomap(np, 0);
	WARN_ON(!ocotp_base);

	soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
	soc_uid <<= 32;
	soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);

	iounmap(ocotp_base);
	of_node_put(np);
}

static u32 __init imx8mm_soc_revision(void)
{
	struct device_node *np;
	void __iomem *anatop_base;
	u32 rev;

	np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-anatop");
	if (!np)
		return 0;

	anatop_base = of_iomap(np, 0);
	WARN_ON(!anatop_base);

	rev = readl_relaxed(anatop_base + ANADIG_DIGPROG_IMX8MM);

	iounmap(anatop_base);
	of_node_put(np);

	imx8mm_soc_uid();

	return rev;
}

static const struct imx8_soc_data imx8mq_soc_data = {
	.name = "i.MX8MQ",
	.soc_revision = imx8mq_soc_revision,
};

static const struct imx8_soc_data imx8mm_soc_data = {
	.name = "i.MX8MM",
	.soc_revision = imx8mm_soc_revision,
};

static const struct imx8_soc_data imx8mn_soc_data = {
	.name = "i.MX8MN",
	.soc_revision = imx8mm_soc_revision,
};

static const struct of_device_id imx8_soc_match[] = {
	{ .compatible = "fsl,imx8mq", .data = &imx8mq_soc_data, },
	{ .compatible = "fsl,imx8mm", .data = &imx8mm_soc_data, },
	{ .compatible = "fsl,imx8mn", .data = &imx8mn_soc_data, },
	{ }
};

#define imx8_revision(soc_rev) \
	soc_rev ? \
	kasprintf(GFP_KERNEL, "%d.%d", (soc_rev >> 4) & 0xf,  soc_rev & 0xf) : \
	"unknown"

static int __init imx8_soc_init(void)
{
	struct soc_device_attribute *soc_dev_attr;
	struct soc_device *soc_dev;
	const struct of_device_id *id;
	u32 soc_rev = 0;
	const struct imx8_soc_data *data;
	int ret;

	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
	if (!soc_dev_attr)
		return -ENOMEM;

	soc_dev_attr->family = "Freescale i.MX";

	ret = of_property_read_string(of_root, "model", &soc_dev_attr->machine);
	if (ret)
		goto free_soc;

	id = of_match_node(imx8_soc_match, of_root);
	if (!id) {
		ret = -ENODEV;
		goto free_soc;
	}

	data = id->data;
	if (data) {
		soc_dev_attr->soc_id = data->name;
		if (data->soc_revision)
			soc_rev = data->soc_revision();
	}

	soc_dev_attr->revision = imx8_revision(soc_rev);
	if (!soc_dev_attr->revision) {
		ret = -ENOMEM;
		goto free_soc;
	}

	soc_dev = soc_device_register(soc_dev_attr);
	if (IS_ERR(soc_dev)) {
		ret = PTR_ERR(soc_dev);
		goto free_rev;
	}

	ret = device_create_file(soc_device_to_device(soc_dev),
				 &dev_attr_soc_uid);
	if (ret)
		goto free_rev;

	if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
		platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);

	return 0;

free_rev:
	if (strcmp(soc_dev_attr->revision, "unknown"))
		kfree(soc_dev_attr->revision);
free_soc:
	kfree(soc_dev_attr);
	return ret;
}
device_initcall(imx8_soc_init);