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 { "T7", 0x36 },
45 { "S4", 0x37 },
46 { "A5", 0x3c },
47 { "C3", 0x3d },
48 { "A4", 0x40 },
49 };
50
51 static const struct meson_gx_package_id {
52 const char *name;
53 unsigned int major_id;
54 unsigned int pack_id;
55 unsigned int pack_mask;
56 } soc_packages[] = {
57 { "S905", 0x1f, 0, 0x20 }, /* pack_id != 0x20 */
58 { "S905H", 0x1f, 0x3, 0xf }, /* pack_id & 0xf == 0x3 */
59 { "S905M", 0x1f, 0x20, 0xf0 }, /* pack_id == 0x20 */
60 { "S905D", 0x21, 0, 0xf0 },
61 { "S905X", 0x21, 0x80, 0xf0 },
62 { "S905W", 0x21, 0xa0, 0xf0 },
63 { "S905L", 0x21, 0xc0, 0xf0 },
64 { "S905M2", 0x21, 0xe0, 0xf0 },
65 { "S805X", 0x21, 0x30, 0xf0 },
66 { "S805Y", 0x21, 0xb0, 0xf0 },
67 { "S912", 0x22, 0, 0x0 }, /* Only S912 is known for GXM */
68 { "962X", 0x24, 0x10, 0xf0 },
69 { "962E", 0x24, 0x20, 0xf0 },
70 { "A113X", 0x25, 0x37, 0xff },
71 { "A113X", 0x25, 0x43, 0xff },
72 { "A113D", 0x25, 0x22, 0xff },
73 { "S905L", 0x26, 0, 0x0 },
74 { "S905D2", 0x28, 0x10, 0xf0 },
75 { "S905Y2", 0x28, 0x30, 0xf0 },
76 { "S905X2", 0x28, 0x40, 0xf0 },
77 { "A311D", 0x29, 0x10, 0xf0 },
78 { "S922X", 0x29, 0x40, 0xf0 },
79 { "S905D3", 0x2b, 0x4, 0xf5 },
80 { "S905X3", 0x2b, 0x5, 0xf5 },
81 { "S905X3", 0x2b, 0x10, 0x3f },
82 { "S905D3", 0x2b, 0x30, 0x3f },
83 { "A113L", 0x2c, 0x0, 0xf8 },
84 { "S805X2", 0x37, 0x2, 0xf },
85 { "C308L", 0x3d, 0x1, 0xf },
86 { "A311D2", 0x36, 0x1, 0xf },
87 { "A113X2", 0x3c, 0x1, 0xf },
88 { "A113L2", 0x40, 0x1, 0xf },
89 };
90
socinfo_to_major(u32 socinfo)91 static inline unsigned int socinfo_to_major(u32 socinfo)
92 {
93 return FIELD_GET(SOCINFO_MAJOR, socinfo);
94 }
95
socinfo_to_minor(u32 socinfo)96 static inline unsigned int socinfo_to_minor(u32 socinfo)
97 {
98 return FIELD_GET(SOCINFO_MINOR, socinfo);
99 }
100
socinfo_to_pack(u32 socinfo)101 static inline unsigned int socinfo_to_pack(u32 socinfo)
102 {
103 return FIELD_GET(SOCINFO_PACK, socinfo);
104 }
105
socinfo_to_misc(u32 socinfo)106 static inline unsigned int socinfo_to_misc(u32 socinfo)
107 {
108 return FIELD_GET(SOCINFO_MISC, socinfo);
109 }
110
socinfo_to_package_id(u32 socinfo)111 static const char *socinfo_to_package_id(u32 socinfo)
112 {
113 unsigned int pack = socinfo_to_pack(socinfo);
114 unsigned int major = socinfo_to_major(socinfo);
115 int i;
116
117 for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
118 if (soc_packages[i].major_id == major &&
119 soc_packages[i].pack_id ==
120 (pack & soc_packages[i].pack_mask))
121 return soc_packages[i].name;
122 }
123
124 return "Unknown";
125 }
126
socinfo_to_soc_id(u32 socinfo)127 static const char *socinfo_to_soc_id(u32 socinfo)
128 {
129 unsigned int id = socinfo_to_major(socinfo);
130 int i;
131
132 for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
133 if (soc_ids[i].id == id)
134 return soc_ids[i].name;
135 }
136
137 return "Unknown";
138 }
139
meson_gx_socinfo_init(void)140 static int __init meson_gx_socinfo_init(void)
141 {
142 struct soc_device_attribute *soc_dev_attr;
143 struct soc_device *soc_dev;
144 struct device_node *np;
145 struct regmap *regmap;
146 unsigned int socinfo;
147 struct device *dev;
148 int ret;
149
150 /* look up for chipid node */
151 np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
152 if (!np)
153 return -ENODEV;
154
155 /* check if interface is enabled */
156 if (!of_device_is_available(np)) {
157 of_node_put(np);
158 return -ENODEV;
159 }
160
161 /* check if chip-id is available */
162 if (!of_property_read_bool(np, "amlogic,has-chip-id")) {
163 of_node_put(np);
164 return -ENODEV;
165 }
166
167 /* node should be a syscon */
168 regmap = syscon_node_to_regmap(np);
169 of_node_put(np);
170 if (IS_ERR(regmap)) {
171 pr_err("%s: failed to get regmap\n", __func__);
172 return -ENODEV;
173 }
174
175 ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
176 if (ret < 0)
177 return ret;
178
179 if (!socinfo) {
180 pr_err("%s: invalid chipid value\n", __func__);
181 return -EINVAL;
182 }
183
184 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
185 if (!soc_dev_attr)
186 return -ENODEV;
187
188 soc_dev_attr->family = "Amlogic Meson";
189 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
190 socinfo_to_major(socinfo),
191 socinfo_to_minor(socinfo),
192 socinfo_to_pack(socinfo),
193 socinfo_to_misc(socinfo));
194 soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
195 socinfo_to_soc_id(socinfo),
196 socinfo_to_package_id(socinfo));
197
198 soc_dev = soc_device_register(soc_dev_attr);
199 if (IS_ERR(soc_dev)) {
200 kfree(soc_dev_attr->revision);
201 kfree_const(soc_dev_attr->soc_id);
202 kfree(soc_dev_attr);
203 return PTR_ERR(soc_dev);
204 }
205 dev = soc_device_to_device(soc_dev);
206
207 dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
208 soc_dev_attr->soc_id,
209 socinfo_to_major(socinfo),
210 socinfo_to_minor(socinfo),
211 socinfo_to_pack(socinfo),
212 socinfo_to_misc(socinfo));
213
214 return 0;
215 }
216 device_initcall(meson_gx_socinfo_init);
217