2 * Copyright (c) 2017 BayLibre, SAS
3 * Author: Neil Armstrong <narmstrong@baylibre.com>
5 * SPDX-License-Identifier: GPL-2.0+
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>
19 #define AO_SEC_SD_CFG8 0xe0
20 #define AO_SEC_SOCINFO_OFFSET AO_SEC_SD_CFG8
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)
27 static const struct meson_gx_soc_id {
38 static const struct meson_gx_package_id {
40 unsigned int major_id;
44 { "S905M", 0x1f, 0x20 },
46 { "S905X", 0x21, 0x80 },
47 { "S905L", 0x21, 0xc0 },
48 { "S905M2", 0x21, 0xe0 },
52 static inline unsigned int socinfo_to_major(u32 socinfo)
54 return FIELD_GET(SOCINFO_MAJOR, socinfo);
57 static inline unsigned int socinfo_to_minor(u32 socinfo)
59 return FIELD_GET(SOCINFO_MINOR, socinfo);
62 static inline unsigned int socinfo_to_pack(u32 socinfo)
64 return FIELD_GET(SOCINFO_PACK, socinfo);
67 static inline unsigned int socinfo_to_misc(u32 socinfo)
69 return FIELD_GET(SOCINFO_MISC, socinfo);
72 static const char *socinfo_to_package_id(u32 socinfo)
74 unsigned int pack = socinfo_to_pack(socinfo) & 0xf0;
75 unsigned int major = socinfo_to_major(socinfo);
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;
87 static const char *socinfo_to_soc_id(u32 socinfo)
89 unsigned int id = socinfo_to_major(socinfo);
92 for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
93 if (soc_ids[i].id == id)
94 return soc_ids[i].name;
100 int __init meson_gx_socinfo_init(void)
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;
110 /* look up for chipid node */
111 np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
115 /* check if interface is enabled */
116 if (!of_device_is_available(np))
119 /* check if chip-id is available */
120 if (!of_property_read_bool(np, "amlogic,has-chip-id"))
123 /* node should be a syscon */
124 regmap = syscon_node_to_regmap(np);
126 if (IS_ERR(regmap)) {
127 pr_err("%s: failed to get regmap\n", __func__);
131 ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
136 pr_err("%s: invalid chipid value\n", __func__);
140 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
144 soc_dev_attr->family = "Amlogic Meson";
146 np = of_find_node_by_path("/");
147 of_property_read_string(np, "model", &soc_dev_attr->machine);
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));
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);
164 return PTR_ERR(soc_dev);
166 dev = soc_device_to_device(soc_dev);
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));
177 device_initcall(meson_gx_socinfo_init);