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4
5
6#include <linux/init.h>
7#include <linux/io.h>
8#include <linux/of_address.h>
9#include <linux/slab.h>
10#include <linux/sys_soc.h>
11#include <linux/platform_device.h>
12#include <linux/of.h>
13
14#define REV_B1 0x21
15
16#define IMX8MQ_SW_INFO_B1 0x40
17#define IMX8MQ_SW_MAGIC_B1 0xff0055aa
18
19#define OCOTP_UID_LOW 0x410
20#define OCOTP_UID_HIGH 0x420
21
22
23#define ANADIG_DIGPROG_IMX8MM 0x800
24
25struct imx8_soc_data {
26 char *name;
27 u32 (*soc_revision)(void);
28};
29
30static u64 soc_uid;
31
32static ssize_t soc_uid_show(struct device *dev,
33 struct device_attribute *attr, char *buf)
34{
35 return sprintf(buf, "%016llX\n", soc_uid);
36}
37
38static DEVICE_ATTR_RO(soc_uid);
39
40static u32 __init imx8mq_soc_revision(void)
41{
42 struct device_node *np;
43 void __iomem *ocotp_base;
44 u32 magic;
45 u32 rev = 0;
46
47 np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp");
48 if (!np)
49 goto out;
50
51 ocotp_base = of_iomap(np, 0);
52 WARN_ON(!ocotp_base);
53
54 magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1);
55 if (magic == IMX8MQ_SW_MAGIC_B1)
56 rev = REV_B1;
57
58 soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
59 soc_uid <<= 32;
60 soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
61
62 iounmap(ocotp_base);
63
64out:
65 of_node_put(np);
66 return rev;
67}
68
69static void __init imx8mm_soc_uid(void)
70{
71 void __iomem *ocotp_base;
72 struct device_node *np;
73
74 np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-ocotp");
75 if (!np)
76 return;
77
78 ocotp_base = of_iomap(np, 0);
79 WARN_ON(!ocotp_base);
80
81 soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
82 soc_uid <<= 32;
83 soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
84
85 iounmap(ocotp_base);
86 of_node_put(np);
87}
88
89static u32 __init imx8mm_soc_revision(void)
90{
91 struct device_node *np;
92 void __iomem *anatop_base;
93 u32 rev;
94
95 np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-anatop");
96 if (!np)
97 return 0;
98
99 anatop_base = of_iomap(np, 0);
100 WARN_ON(!anatop_base);
101
102 rev = readl_relaxed(anatop_base + ANADIG_DIGPROG_IMX8MM);
103
104 iounmap(anatop_base);
105 of_node_put(np);
106
107 imx8mm_soc_uid();
108
109 return rev;
110}
111
112static const struct imx8_soc_data imx8mq_soc_data = {
113 .name = "i.MX8MQ",
114 .soc_revision = imx8mq_soc_revision,
115};
116
117static const struct imx8_soc_data imx8mm_soc_data = {
118 .name = "i.MX8MM",
119 .soc_revision = imx8mm_soc_revision,
120};
121
122static const struct imx8_soc_data imx8mn_soc_data = {
123 .name = "i.MX8MN",
124 .soc_revision = imx8mm_soc_revision,
125};
126
127static const struct of_device_id imx8_soc_match[] = {
128 { .compatible = "fsl,imx8mq", .data = &imx8mq_soc_data, },
129 { .compatible = "fsl,imx8mm", .data = &imx8mm_soc_data, },
130 { .compatible = "fsl,imx8mn", .data = &imx8mn_soc_data, },
131 { }
132};
133
134#define imx8_revision(soc_rev) \
135 soc_rev ? \
136 kasprintf(GFP_KERNEL, "%d.%d", (soc_rev >> 4) & 0xf, soc_rev & 0xf) : \
137 "unknown"
138
139static int __init imx8_soc_init(void)
140{
141 struct soc_device_attribute *soc_dev_attr;
142 struct soc_device *soc_dev;
143 const struct of_device_id *id;
144 u32 soc_rev = 0;
145 const struct imx8_soc_data *data;
146 int ret;
147
148 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
149 if (!soc_dev_attr)
150 return -ENOMEM;
151
152 soc_dev_attr->family = "Freescale i.MX";
153
154 ret = of_property_read_string(of_root, "model", &soc_dev_attr->machine);
155 if (ret)
156 goto free_soc;
157
158 id = of_match_node(imx8_soc_match, of_root);
159 if (!id) {
160 ret = -ENODEV;
161 goto free_soc;
162 }
163
164 data = id->data;
165 if (data) {
166 soc_dev_attr->soc_id = data->name;
167 if (data->soc_revision)
168 soc_rev = data->soc_revision();
169 }
170
171 soc_dev_attr->revision = imx8_revision(soc_rev);
172 if (!soc_dev_attr->revision) {
173 ret = -ENOMEM;
174 goto free_soc;
175 }
176
177 soc_dev = soc_device_register(soc_dev_attr);
178 if (IS_ERR(soc_dev)) {
179 ret = PTR_ERR(soc_dev);
180 goto free_rev;
181 }
182
183 ret = device_create_file(soc_device_to_device(soc_dev),
184 &dev_attr_soc_uid);
185 if (ret)
186 goto free_rev;
187
188 if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
189 platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
190
191 return 0;
192
193free_rev:
194 if (strcmp(soc_dev_attr->revision, "unknown"))
195 kfree(soc_dev_attr->revision);
196free_soc:
197 kfree(soc_dev_attr);
198 return ret;
199}
200device_initcall(imx8_soc_init);
201
