1/*
2 * Copyright (c) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
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, fmt: "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(s: 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 { /* sentinel */ }
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(s: "amlogic,meson-mx-assist");
118 if (IS_ERR(ptr: assist_regmap))
119 return PTR_ERR(ptr: assist_regmap);
120
121 bootrom_regmap =
122 syscon_regmap_lookup_by_compatible(s: "amlogic,meson-mx-bootrom");
123 if (IS_ERR(ptr: bootrom_regmap))
124 return PTR_ERR(ptr: bootrom_regmap);
125
126 np = of_find_matching_node(NULL, matches: meson_mx_socinfo_analog_top_ids);
127 if (np) {
128 analog_top_regmap = syscon_node_to_regmap(np);
129 of_node_put(node: np);
130 if (IS_ERR(ptr: analog_top_regmap))
131 return PTR_ERR(ptr: analog_top_regmap);
132
133 ret = regmap_read(map: analog_top_regmap,
134 MESON_MX_ANALOG_TOP_METAL_REVISION,
135 val: &metal_rev);
136 if (ret)
137 return ret;
138 }
139
140 ret = regmap_read(map: assist_regmap, MESON_MX_ASSIST_HW_REV, val: &major_ver);
141 if (ret < 0)
142 return ret;
143
144 ret = regmap_read(map: bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,
145 val: &misc_ver);
146 if (ret < 0)
147 return ret;
148
149 soc_dev_attr = kzalloc(size: sizeof(*soc_dev_attr), GFP_KERNEL);
150 if (!soc_dev_attr)
151 return -ENODEV;
152
153 soc_dev_attr->family = "Amlogic Meson";
154
155 np = of_find_node_by_path(path: "/");
156 of_property_read_string(np, propname: "model", out_string: &soc_dev_attr->machine);
157 of_node_put(node: np);
158
159 soc_dev_attr->revision = meson_mx_socinfo_revision(major_ver, misc_ver,
160 metal_rev);
161 soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);
162
163 soc_dev = soc_device_register(soc_plat_dev_attr: soc_dev_attr);
164 if (IS_ERR(ptr: soc_dev)) {
165 kfree_const(x: soc_dev_attr->revision);
166 kfree_const(x: soc_dev_attr->soc_id);
167 kfree(objp: soc_dev_attr);
168 return PTR_ERR(ptr: soc_dev);
169 }
170
171 dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",
172 soc_dev_attr->soc_id, soc_dev_attr->revision);
173
174 return 0;
175}
176device_initcall(meson_mx_socinfo_init);
177

source code of linux/drivers/soc/amlogic/meson-mx-socinfo.c