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 { "S905X2", 0x28, 0x40, 0xf0 },
69 { "A311D", 0x29, 0x10, 0xf0 },
70 { "S922X", 0x29, 0x40, 0xf0 },
71 { "S905D3", 0x2b, 0x4, 0xf5 },
72 { "S905X3", 0x2b, 0x5, 0xf5 },
73 { "S905X3", 0x2b, 0x10, 0x3f },
74 { "S905D3", 0x2b, 0x30, 0x3f },
75 { "A113L", 0x2c, 0x0, 0xf8 },
76 };
77
socinfo_to_major(u32 socinfo)78 static inline unsigned int socinfo_to_major(u32 socinfo)
79 {
80 return FIELD_GET(SOCINFO_MAJOR, socinfo);
81 }
82
socinfo_to_minor(u32 socinfo)83 static inline unsigned int socinfo_to_minor(u32 socinfo)
84 {
85 return FIELD_GET(SOCINFO_MINOR, socinfo);
86 }
87
socinfo_to_pack(u32 socinfo)88 static inline unsigned int socinfo_to_pack(u32 socinfo)
89 {
90 return FIELD_GET(SOCINFO_PACK, socinfo);
91 }
92
socinfo_to_misc(u32 socinfo)93 static inline unsigned int socinfo_to_misc(u32 socinfo)
94 {
95 return FIELD_GET(SOCINFO_MISC, socinfo);
96 }
97
socinfo_to_package_id(u32 socinfo)98 static const char *socinfo_to_package_id(u32 socinfo)
99 {
100 unsigned int pack = socinfo_to_pack(socinfo);
101 unsigned int major = socinfo_to_major(socinfo);
102 int i;
103
104 for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
105 if (soc_packages[i].major_id == major &&
106 soc_packages[i].pack_id ==
107 (pack & soc_packages[i].pack_mask))
108 return soc_packages[i].name;
109 }
110
111 return "Unknown";
112 }
113
socinfo_to_soc_id(u32 socinfo)114 static const char *socinfo_to_soc_id(u32 socinfo)
115 {
116 unsigned int id = socinfo_to_major(socinfo);
117 int i;
118
119 for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
120 if (soc_ids[i].id == id)
121 return soc_ids[i].name;
122 }
123
124 return "Unknown";
125 }
126
meson_gx_socinfo_init(void)127 static int __init meson_gx_socinfo_init(void)
128 {
129 struct soc_device_attribute *soc_dev_attr;
130 struct soc_device *soc_dev;
131 struct device_node *np;
132 struct regmap *regmap;
133 unsigned int socinfo;
134 struct device *dev;
135 int ret;
136
137 /* look up for chipid node */
138 np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
139 if (!np)
140 return -ENODEV;
141
142 /* check if interface is enabled */
143 if (!of_device_is_available(np)) {
144 of_node_put(np);
145 return -ENODEV;
146 }
147
148 /* check if chip-id is available */
149 if (!of_property_read_bool(np, "amlogic,has-chip-id")) {
150 of_node_put(np);
151 return -ENODEV;
152 }
153
154 /* node should be a syscon */
155 regmap = syscon_node_to_regmap(np);
156 of_node_put(np);
157 if (IS_ERR(regmap)) {
158 pr_err("%s: failed to get regmap\n", __func__);
159 return -ENODEV;
160 }
161
162 ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
163 if (ret < 0)
164 return ret;
165
166 if (!socinfo) {
167 pr_err("%s: invalid chipid value\n", __func__);
168 return -EINVAL;
169 }
170
171 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
172 if (!soc_dev_attr)
173 return -ENODEV;
174
175 soc_dev_attr->family = "Amlogic Meson";
176
177 np = of_find_node_by_path("/");
178 of_property_read_string(np, "model", &soc_dev_attr->machine);
179 of_node_put(np);
180
181 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
182 socinfo_to_major(socinfo),
183 socinfo_to_minor(socinfo),
184 socinfo_to_pack(socinfo),
185 socinfo_to_misc(socinfo));
186 soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
187 socinfo_to_soc_id(socinfo),
188 socinfo_to_package_id(socinfo));
189
190 soc_dev = soc_device_register(soc_dev_attr);
191 if (IS_ERR(soc_dev)) {
192 kfree(soc_dev_attr->revision);
193 kfree_const(soc_dev_attr->soc_id);
194 kfree(soc_dev_attr);
195 return PTR_ERR(soc_dev);
196 }
197 dev = soc_device_to_device(soc_dev);
198
199 dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
200 soc_dev_attr->soc_id,
201 socinfo_to_major(socinfo),
202 socinfo_to_minor(socinfo),
203 socinfo_to_pack(socinfo),
204 socinfo_to_misc(socinfo));
205
206 return 0;
207 }
208 device_initcall(meson_gx_socinfo_init);
209
