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
socinfo_to_major(u32 socinfo)79 static inline unsigned int socinfo_to_major(u32 socinfo)
80 {
81 return FIELD_GET(SOCINFO_MAJOR, socinfo);
82 }
83
socinfo_to_minor(u32 socinfo)84 static inline unsigned int socinfo_to_minor(u32 socinfo)
85 {
86 return FIELD_GET(SOCINFO_MINOR, socinfo);
87 }
88
socinfo_to_pack(u32 socinfo)89 static inline unsigned int socinfo_to_pack(u32 socinfo)
90 {
91 return FIELD_GET(SOCINFO_PACK, socinfo);
92 }
93
socinfo_to_misc(u32 socinfo)94 static inline unsigned int socinfo_to_misc(u32 socinfo)
95 {
96 return FIELD_GET(SOCINFO_MISC, socinfo);
97 }
98
socinfo_to_package_id(u32 socinfo)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
socinfo_to_soc_id(u32 socinfo)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
meson_gx_socinfo_init(void)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