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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         { "G12A", 0x28 },
41         { "G12B", 0x29 },
42         { "SM1", 0x2b },
43         { "A1", 0x2c },
44 };
45
46 static const struct meson_gx_package_id {
47         const char *name;
48         unsigned int major_id;
49         unsigned int pack_id;
50         unsigned int pack_mask;
51 } soc_packages[] = {
52         { "S905", 0x1f, 0, 0x20 }, /* pack_id != 0x20 */
53         { "S905H", 0x1f, 0x3, 0xf }, /* pack_id & 0xf == 0x3 */
54         { "S905M", 0x1f, 0x20, 0xf0 }, /* pack_id == 0x20 */
55         { "S905D", 0x21, 0, 0xf0 },
56         { "S905X", 0x21, 0x80, 0xf0 },
57         { "S905W", 0x21, 0xa0, 0xf0 },
58         { "S905L", 0x21, 0xc0, 0xf0 },
59         { "S905M2", 0x21, 0xe0, 0xf0 },
60         { "S805X", 0x21, 0x30, 0xf0 },
61         { "S805Y", 0x21, 0xb0, 0xf0 },
62         { "S912", 0x22, 0, 0x0 }, /* Only S912 is known for GXM */
63         { "962X", 0x24, 0x10, 0xf0 },
64         { "962E", 0x24, 0x20, 0xf0 },
65         { "A113X", 0x25, 0x37, 0xff },
66         { "A113X", 0x25, 0x43, 0xff },
67         { "A113D", 0x25, 0x22, 0xff },
68         { "S905L", 0x26, 0, 0x0 },
69         { "S905D2", 0x28, 0x10, 0xf0 },
70         { "S905Y2", 0x28, 0x30, 0xf0 },
71         { "S905X2", 0x28, 0x40, 0xf0 },
72         { "A311D", 0x29, 0x10, 0xf0 },
73         { "S922X", 0x29, 0x40, 0xf0 },
74         { "S905D3", 0x2b, 0x4, 0xf5 },
75         { "S905X3", 0x2b, 0x5, 0xf5 },
76         { "S905X3", 0x2b, 0x10, 0x3f },
77         { "S905D3", 0x2b, 0x30, 0x3f },
78         { "A113L", 0x2c, 0x0, 0xf8 },
79 };
80
81 static inline unsigned int socinfo_to_major(u32 socinfo)
82 {
83         return FIELD_GET(SOCINFO_MAJOR, socinfo);
84 }
85
86 static inline unsigned int socinfo_to_minor(u32 socinfo)
87 {
88         return FIELD_GET(SOCINFO_MINOR, socinfo);
89 }
90
91 static inline unsigned int socinfo_to_pack(u32 socinfo)
92 {
93         return FIELD_GET(SOCINFO_PACK, socinfo);
94 }
95
96 static inline unsigned int socinfo_to_misc(u32 socinfo)
97 {
98         return FIELD_GET(SOCINFO_MISC, socinfo);
99 }
100
101 static const char *socinfo_to_package_id(u32 socinfo)
102 {
103         unsigned int pack = socinfo_to_pack(socinfo);
104         unsigned int major = socinfo_to_major(socinfo);
105         int i;
106
107         for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
108                 if (soc_packages[i].major_id == major &&
109                     soc_packages[i].pack_id ==
110                                 (pack & soc_packages[i].pack_mask))
111                         return soc_packages[i].name;
112         }
113
114         return "Unknown";
115 }
116
117 static const char *socinfo_to_soc_id(u32 socinfo)
118 {
119         unsigned int id = socinfo_to_major(socinfo);
120         int i;
121
122         for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
123                 if (soc_ids[i].id == id)
124                         return soc_ids[i].name;
125         }
126
127         return "Unknown";
128 }
129
130 static int __init meson_gx_socinfo_init(void)
131 {
132         struct soc_device_attribute *soc_dev_attr;
133         struct soc_device *soc_dev;
134         struct device_node *np;
135         struct regmap *regmap;
136         unsigned int socinfo;
137         struct device *dev;
138         int ret;
139
140         /* look up for chipid node */
141         np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
142         if (!np)
143                 return -ENODEV;
144
145         /* check if interface is enabled */
146         if (!of_device_is_available(np)) {
147                 of_node_put(np);
148                 return -ENODEV;
149         }
150
151         /* check if chip-id is available */
152         if (!of_property_read_bool(np, "amlogic,has-chip-id")) {
153                 of_node_put(np);
154                 return -ENODEV;
155         }
156
157         /* node should be a syscon */
158         regmap = syscon_node_to_regmap(np);
159         of_node_put(np);
160         if (IS_ERR(regmap)) {
161                 pr_err("%s: failed to get regmap\n", __func__);
162                 return -ENODEV;
163         }
164
165         ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
166         if (ret < 0)
167                 return ret;
168
169         if (!socinfo) {
170                 pr_err("%s: invalid chipid value\n", __func__);
171                 return -EINVAL;
172         }
173
174         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
175         if (!soc_dev_attr)
176                 return -ENODEV;
177
178         soc_dev_attr->family = "Amlogic Meson";
179         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
180                                            socinfo_to_major(socinfo),
181                                            socinfo_to_minor(socinfo),
182                                            socinfo_to_pack(socinfo),
183                                            socinfo_to_misc(socinfo));
184         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
185                                          socinfo_to_soc_id(socinfo),
186                                          socinfo_to_package_id(socinfo));
187
188         soc_dev = soc_device_register(soc_dev_attr);
189         if (IS_ERR(soc_dev)) {
190                 kfree(soc_dev_attr->revision);
191                 kfree_const(soc_dev_attr->soc_id);
192                 kfree(soc_dev_attr);
193                 return PTR_ERR(soc_dev);
194         }
195         dev = soc_device_to_device(soc_dev);
196
197         dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
198                         soc_dev_attr->soc_id,
199                         socinfo_to_major(socinfo),
200                         socinfo_to_minor(socinfo),
201                         socinfo_to_pack(socinfo),
202                         socinfo_to_misc(socinfo));
203
204         return 0;
205 }
206 device_initcall(meson_gx_socinfo_init);
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