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7#include <linux/io.h>
8#include <linux/of.h>
9#include <linux/of_address.h>
10#include <linux/of_platform.h>
11#include <linux/platform_device.h>
12#include <linux/slab.h>
13#include <linux/sys_soc.h>
14#include <linux/bitfield.h>
15#include <linux/regmap.h>
16#include <linux/mfd/syscon.h>
17
18#define MESON_SOCINFO_MAJOR_VER_MESON6 0x16
19#define MESON_SOCINFO_MAJOR_VER_MESON8 0x19
20#define MESON_SOCINFO_MAJOR_VER_MESON8B 0x1b
21
22#define MESON_MX_ASSIST_HW_REV 0x14c
23
24#define MESON_MX_ANALOG_TOP_METAL_REVISION 0x0
25
26#define MESON_MX_BOOTROM_MISC_VER 0x4
27
28static const char *meson_mx_socinfo_revision(unsigned int major_ver,
29 unsigned int misc_ver,
30 unsigned int metal_rev)
31{
32 unsigned int minor_ver;
33
34 switch (major_ver) {
35 case MESON_SOCINFO_MAJOR_VER_MESON6:
36 minor_ver = 0xa;
37 break;
38
39 case MESON_SOCINFO_MAJOR_VER_MESON8:
40 if (metal_rev == 0x11111112)
41 major_ver = 0x1d;
42
43 if (metal_rev == 0x11111111 || metal_rev == 0x11111112)
44 minor_ver = 0xa;
45 else if (metal_rev == 0x11111113)
46 minor_ver = 0xb;
47 else if (metal_rev == 0x11111133)
48 minor_ver = 0xc;
49 else
50 minor_ver = 0xd;
51
52 break;
53
54 case MESON_SOCINFO_MAJOR_VER_MESON8B:
55 if (metal_rev == 0x11111111)
56 minor_ver = 0xa;
57 else
58 minor_ver = 0xb;
59
60 break;
61
62 default:
63 minor_ver = 0x0;
64 break;
65 }
66
67 return kasprintf(GFP_KERNEL, "Rev%X (%x - 0:%X)", minor_ver, major_ver,
68 misc_ver);
69}
70
71static const char *meson_mx_socinfo_soc_id(unsigned int major_ver,
72 unsigned int metal_rev)
73{
74 const char *soc_id;
75
76 switch (major_ver) {
77 case MESON_SOCINFO_MAJOR_VER_MESON6:
78 soc_id = "Meson6 (AML8726-MX)";
79 break;
80
81 case MESON_SOCINFO_MAJOR_VER_MESON8:
82 if (metal_rev == 0x11111112)
83 soc_id = "Meson8m2 (S812)";
84 else
85 soc_id = "Meson8 (S802)";
86
87 break;
88
89 case MESON_SOCINFO_MAJOR_VER_MESON8B:
90 soc_id = "Meson8b (S805)";
91 break;
92
93 default:
94 soc_id = "Unknown";
95 break;
96 }
97
98 return kstrdup_const(soc_id, GFP_KERNEL);
99}
100
101static const struct of_device_id meson_mx_socinfo_analog_top_ids[] = {
102 { .compatible = "amlogic,meson8-analog-top", },
103 { .compatible = "amlogic,meson8b-analog-top", },
104 { }
105};
106
107static int __init meson_mx_socinfo_init(void)
108{
109 struct soc_device_attribute *soc_dev_attr;
110 struct soc_device *soc_dev;
111 struct device_node *np;
112 struct regmap *assist_regmap, *bootrom_regmap, *analog_top_regmap;
113 unsigned int major_ver, misc_ver, metal_rev = 0;
114 int ret;
115
116 assist_regmap =
117 syscon_regmap_lookup_by_compatible("amlogic,meson-mx-assist");
118 if (IS_ERR(assist_regmap))
119 return PTR_ERR(assist_regmap);
120
121 bootrom_regmap =
122 syscon_regmap_lookup_by_compatible("amlogic,meson-mx-bootrom");
123 if (IS_ERR(bootrom_regmap))
124 return PTR_ERR(bootrom_regmap);
125
126 np = of_find_matching_node(NULL, meson_mx_socinfo_analog_top_ids);
127 if (np) {
128 analog_top_regmap = syscon_node_to_regmap(np);
129 if (IS_ERR(analog_top_regmap))
130 return PTR_ERR(analog_top_regmap);
131
132 ret = regmap_read(analog_top_regmap,
133 MESON_MX_ANALOG_TOP_METAL_REVISION,
134 &metal_rev);
135 if (ret)
136 return ret;
137 }
138
139 ret = regmap_read(assist_regmap, MESON_MX_ASSIST_HW_REV, &major_ver);
140 if (ret < 0)
141 return ret;
142
143 ret = regmap_read(bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,
144 &misc_ver);
145 if (ret < 0)
146 return ret;
147
148 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
149 if (!soc_dev_attr)
150 return -ENODEV;
151
152 soc_dev_attr->family = "Amlogic Meson";
153
154 np = of_find_node_by_path("/");
155 of_property_read_string(np, "model", &soc_dev_attr->machine);
156 of_node_put(np);
157
158 soc_dev_attr->revision = meson_mx_socinfo_revision(major_ver, misc_ver,
159 metal_rev);
160 soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);
161
162 soc_dev = soc_device_register(soc_dev_attr);
163 if (IS_ERR(soc_dev)) {
164 kfree_const(soc_dev_attr->revision);
165 kfree_const(soc_dev_attr->soc_id);
166 kfree(soc_dev_attr);
167 return PTR_ERR(soc_dev);
168 }
169
170 dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",
171 soc_dev_attr->soc_id, soc_dev_attr->revision);
172
173 return 0;
174}
175device_initcall(meson_mx_socinfo_init);
176
