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[linux.git] / drivers / soc / amlogic / meson-gx-socinfo.c
1 /*
2  * Copyright (c) 2017 BayLibre, SAS
3  * Author: Neil Armstrong <[email protected]>
4  *
5  * SPDX-License-Identifier: GPL-2.0+
6  */
7
8 #include <linux/io.h>
9 #include <linux/of.h>
10 #include <linux/of_address.h>
11 #include <linux/of_platform.h>
12 #include <linux/platform_device.h>
13 #include <linux/slab.h>
14 #include <linux/sys_soc.h>
15 #include <linux/bitfield.h>
16 #include <linux/regmap.h>
17 #include <linux/mfd/syscon.h>
18
19 #define AO_SEC_SD_CFG8          0xe0
20 #define AO_SEC_SOCINFO_OFFSET   AO_SEC_SD_CFG8
21
22 #define SOCINFO_MAJOR   GENMASK(31, 24)
23 #define SOCINFO_PACK    GENMASK(23, 16)
24 #define SOCINFO_MINOR   GENMASK(15, 8)
25 #define SOCINFO_MISC    GENMASK(7, 0)
26
27 static const struct meson_gx_soc_id {
28         const char *name;
29         unsigned int id;
30 } soc_ids[] = {
31         { "GXBB", 0x1f },
32         { "GXTVBB", 0x20 },
33         { "GXL", 0x21 },
34         { "GXM", 0x22 },
35         { "TXL", 0x23 },
36         { "TXLX", 0x24 },
37         { "AXG", 0x25 },
38         { "GXLX", 0x26 },
39         { "TXHD", 0x27 },
40 };
41
42 static const struct meson_gx_package_id {
43         const char *name;
44         unsigned int major_id;
45         unsigned int pack_id;
46 } soc_packages[] = {
47         { "S905", 0x1f, 0 },
48         { "S905H", 0x1f, 0x13 },
49         { "S905M", 0x1f, 0x20 },
50         { "S905D", 0x21, 0 },
51         { "S905X", 0x21, 0x80 },
52         { "S905W", 0x21, 0xa0 },
53         { "S905L", 0x21, 0xc0 },
54         { "S905M2", 0x21, 0xe0 },
55         { "S912", 0x22, 0 },
56         { "962X", 0x24, 0x10 },
57         { "962E", 0x24, 0x20 },
58         { "A113X", 0x25, 0x37 },
59         { "A113D", 0x25, 0x22 },
60 };
61
62 static inline unsigned int socinfo_to_major(u32 socinfo)
63 {
64         return FIELD_GET(SOCINFO_MAJOR, socinfo);
65 }
66
67 static inline unsigned int socinfo_to_minor(u32 socinfo)
68 {
69         return FIELD_GET(SOCINFO_MINOR, socinfo);
70 }
71
72 static inline unsigned int socinfo_to_pack(u32 socinfo)
73 {
74         return FIELD_GET(SOCINFO_PACK, socinfo);
75 }
76
77 static inline unsigned int socinfo_to_misc(u32 socinfo)
78 {
79         return FIELD_GET(SOCINFO_MISC, socinfo);
80 }
81
82 static const char *socinfo_to_package_id(u32 socinfo)
83 {
84         unsigned int pack = socinfo_to_pack(socinfo) & 0xf0;
85         unsigned int major = socinfo_to_major(socinfo);
86         int i;
87
88         for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
89                 if (soc_packages[i].major_id == major &&
90                     soc_packages[i].pack_id == pack)
91                         return soc_packages[i].name;
92         }
93
94         return "Unknown";
95 }
96
97 static const char *socinfo_to_soc_id(u32 socinfo)
98 {
99         unsigned int id = socinfo_to_major(socinfo);
100         int i;
101
102         for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
103                 if (soc_ids[i].id == id)
104                         return soc_ids[i].name;
105         }
106
107         return "Unknown";
108 }
109
110 static int __init meson_gx_socinfo_init(void)
111 {
112         struct soc_device_attribute *soc_dev_attr;
113         struct soc_device *soc_dev;
114         struct device_node *np;
115         struct regmap *regmap;
116         unsigned int socinfo;
117         struct device *dev;
118         int ret;
119
120         /* look up for chipid node */
121         np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
122         if (!np)
123                 return -ENODEV;
124
125         /* check if interface is enabled */
126         if (!of_device_is_available(np))
127                 return -ENODEV;
128
129         /* check if chip-id is available */
130         if (!of_property_read_bool(np, "amlogic,has-chip-id"))
131                 return -ENODEV;
132
133         /* node should be a syscon */
134         regmap = syscon_node_to_regmap(np);
135         of_node_put(np);
136         if (IS_ERR(regmap)) {
137                 pr_err("%s: failed to get regmap\n", __func__);
138                 return -ENODEV;
139         }
140
141         ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
142         if (ret < 0)
143                 return ret;
144
145         if (!socinfo) {
146                 pr_err("%s: invalid chipid value\n", __func__);
147                 return -EINVAL;
148         }
149
150         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
151         if (!soc_dev_attr)
152                 return -ENODEV;
153
154         soc_dev_attr->family = "Amlogic Meson";
155
156         np = of_find_node_by_path("/");
157         of_property_read_string(np, "model", &soc_dev_attr->machine);
158         of_node_put(np);
159
160         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
161                                            socinfo_to_major(socinfo),
162                                            socinfo_to_minor(socinfo),
163                                            socinfo_to_pack(socinfo),
164                                            socinfo_to_misc(socinfo));
165         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
166                                          socinfo_to_soc_id(socinfo),
167                                          socinfo_to_package_id(socinfo));
168
169         soc_dev = soc_device_register(soc_dev_attr);
170         if (IS_ERR(soc_dev)) {
171                 kfree(soc_dev_attr->revision);
172                 kfree_const(soc_dev_attr->soc_id);
173                 kfree(soc_dev_attr);
174                 return PTR_ERR(soc_dev);
175         }
176         dev = soc_device_to_device(soc_dev);
177
178         dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
179                         soc_dev_attr->soc_id,
180                         socinfo_to_major(socinfo),
181                         socinfo_to_minor(socinfo),
182                         socinfo_to_pack(socinfo),
183                         socinfo_to_misc(socinfo));
184
185         return 0;
186 }
187 device_initcall(meson_gx_socinfo_init);
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