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