1 /*
2  * Copyright (c) 2017 BayLibre, SAS
3  * Author: Neil Armstrong <narmstrong@baylibre.com>
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_MINOR	GENMASK(23, 16)
24 #define SOCINFO_PACK	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 };
37 
38 static const struct meson_gx_package_id {
39 	const char *name;
40 	unsigned int major_id;
41 	unsigned int pack_id;
42 } soc_packages[] = {
43 	{ "S905", 0x1f, 0 },
44 	{ "S905M", 0x1f, 0x20 },
45 	{ "S905D", 0x21, 0 },
46 	{ "S905X", 0x21, 0x80 },
47 	{ "S905L", 0x21, 0xc0 },
48 	{ "S905M2", 0x21, 0xe0 },
49 	{ "S912", 0x22, 0 },
50 };
51 
52 static inline unsigned int socinfo_to_major(u32 socinfo)
53 {
54 	return FIELD_GET(SOCINFO_MAJOR, socinfo);
55 }
56 
57 static inline unsigned int socinfo_to_minor(u32 socinfo)
58 {
59 	return FIELD_GET(SOCINFO_MINOR, socinfo);
60 }
61 
62 static inline unsigned int socinfo_to_pack(u32 socinfo)
63 {
64 	return FIELD_GET(SOCINFO_PACK, socinfo);
65 }
66 
67 static inline unsigned int socinfo_to_misc(u32 socinfo)
68 {
69 	return FIELD_GET(SOCINFO_MISC, socinfo);
70 }
71 
72 static const char *socinfo_to_package_id(u32 socinfo)
73 {
74 	unsigned int pack = socinfo_to_pack(socinfo) & 0xf0;
75 	unsigned int major = socinfo_to_major(socinfo);
76 	int i;
77 
78 	for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
79 		if (soc_packages[i].major_id == major &&
80 		    soc_packages[i].pack_id == pack)
81 			return soc_packages[i].name;
82 	}
83 
84 	return "Unknown";
85 }
86 
87 static const char *socinfo_to_soc_id(u32 socinfo)
88 {
89 	unsigned int id = socinfo_to_major(socinfo);
90 	int i;
91 
92 	for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
93 		if (soc_ids[i].id == id)
94 			return soc_ids[i].name;
95 	}
96 
97 	return "Unknown";
98 }
99 
100 int __init meson_gx_socinfo_init(void)
101 {
102 	struct soc_device_attribute *soc_dev_attr;
103 	struct soc_device *soc_dev;
104 	struct device_node *np;
105 	struct regmap *regmap;
106 	unsigned int socinfo;
107 	struct device *dev;
108 	int ret;
109 
110 	/* look up for chipid node */
111 	np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
112 	if (!np)
113 		return -ENODEV;
114 
115 	/* check if interface is enabled */
116 	if (!of_device_is_available(np))
117 		return -ENODEV;
118 
119 	/* check if chip-id is available */
120 	if (!of_property_read_bool(np, "amlogic,has-chip-id"))
121 		return -ENODEV;
122 
123 	/* node should be a syscon */
124 	regmap = syscon_node_to_regmap(np);
125 	of_node_put(np);
126 	if (IS_ERR(regmap)) {
127 		pr_err("%s: failed to get regmap\n", __func__);
128 		return -ENODEV;
129 	}
130 
131 	ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
132 	if (ret < 0)
133 		return ret;
134 
135 	if (!socinfo) {
136 		pr_err("%s: invalid chipid value\n", __func__);
137 		return -EINVAL;
138 	}
139 
140 	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
141 	if (!soc_dev_attr)
142 		return -ENODEV;
143 
144 	soc_dev_attr->family = "Amlogic Meson";
145 
146 	np = of_find_node_by_path("/");
147 	of_property_read_string(np, "model", &soc_dev_attr->machine);
148 	of_node_put(np);
149 
150 	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
151 					   socinfo_to_major(socinfo),
152 					   socinfo_to_minor(socinfo),
153 					   socinfo_to_pack(socinfo),
154 					   socinfo_to_misc(socinfo));
155 	soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
156 					 socinfo_to_soc_id(socinfo),
157 					 socinfo_to_package_id(socinfo));
158 
159 	soc_dev = soc_device_register(soc_dev_attr);
160 	if (IS_ERR(soc_dev)) {
161 		kfree(soc_dev_attr->revision);
162 		kfree_const(soc_dev_attr->soc_id);
163 		kfree(soc_dev_attr);
164 		return PTR_ERR(soc_dev);
165 	}
166 	dev = soc_device_to_device(soc_dev);
167 
168 	dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
169 			soc_dev_attr->soc_id,
170 			socinfo_to_major(socinfo),
171 			socinfo_to_minor(socinfo),
172 			socinfo_to_pack(socinfo),
173 			socinfo_to_misc(socinfo));
174 
175 	return 0;
176 }
177 device_initcall(meson_gx_socinfo_init);
178