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 {
42 static const struct meson_gx_package_id {
44 unsigned int major_id;
46 unsigned int pack_mask;
48 { "S905", 0x1f, 0, 0x20 }, /* pack_id != 0x20 */
49 { "S905H", 0x1f, 0x3, 0xf }, /* pack_id & 0xf == 0x3 */
50 { "S905M", 0x1f, 0x20, 0xf0 }, /* pack_id == 0x20 */
51 { "S905D", 0x21, 0, 0xf0 },
52 { "S905X", 0x21, 0x80, 0xf0 },
53 { "S905W", 0x21, 0xa0, 0xf0 },
54 { "S905L", 0x21, 0xc0, 0xf0 },
55 { "S905M2", 0x21, 0xe0, 0xf0 },
56 { "S912", 0x22, 0, 0x0 }, /* Only S912 is known for GXM */
57 { "962X", 0x24, 0x10, 0xf0 },
58 { "962E", 0x24, 0x20, 0xf0 },
59 { "A113X", 0x25, 0x37, 0xff },
60 { "A113D", 0x25, 0x22, 0xff },
63 static inline unsigned int socinfo_to_major(u32 socinfo)
65 return FIELD_GET(SOCINFO_MAJOR, socinfo);
68 static inline unsigned int socinfo_to_minor(u32 socinfo)
70 return FIELD_GET(SOCINFO_MINOR, socinfo);
73 static inline unsigned int socinfo_to_pack(u32 socinfo)
75 return FIELD_GET(SOCINFO_PACK, socinfo);
78 static inline unsigned int socinfo_to_misc(u32 socinfo)
80 return FIELD_GET(SOCINFO_MISC, socinfo);
83 static const char *socinfo_to_package_id(u32 socinfo)
85 unsigned int pack = socinfo_to_pack(socinfo);
86 unsigned int major = socinfo_to_major(socinfo);
89 for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
90 if (soc_packages[i].major_id == major &&
91 soc_packages[i].pack_id ==
92 (pack & soc_packages[i].pack_mask))
93 return soc_packages[i].name;
99 static const char *socinfo_to_soc_id(u32 socinfo)
101 unsigned int id = socinfo_to_major(socinfo);
104 for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
105 if (soc_ids[i].id == id)
106 return soc_ids[i].name;
112 static int __init meson_gx_socinfo_init(void)
114 struct soc_device_attribute *soc_dev_attr;
115 struct soc_device *soc_dev;
116 struct device_node *np;
117 struct regmap *regmap;
118 unsigned int socinfo;
122 /* look up for chipid node */
123 np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
127 /* check if interface is enabled */
128 if (!of_device_is_available(np))
131 /* check if chip-id is available */
132 if (!of_property_read_bool(np, "amlogic,has-chip-id"))
135 /* node should be a syscon */
136 regmap = syscon_node_to_regmap(np);
138 if (IS_ERR(regmap)) {
139 pr_err("%s: failed to get regmap\n", __func__);
143 ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
148 pr_err("%s: invalid chipid value\n", __func__);
152 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
156 soc_dev_attr->family = "Amlogic Meson";
158 np = of_find_node_by_path("/");
159 of_property_read_string(np, "model", &soc_dev_attr->machine);
162 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
163 socinfo_to_major(socinfo),
164 socinfo_to_minor(socinfo),
165 socinfo_to_pack(socinfo),
166 socinfo_to_misc(socinfo));
167 soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
168 socinfo_to_soc_id(socinfo),
169 socinfo_to_package_id(socinfo));
171 soc_dev = soc_device_register(soc_dev_attr);
172 if (IS_ERR(soc_dev)) {
173 kfree(soc_dev_attr->revision);
174 kfree_const(soc_dev_attr->soc_id);
176 return PTR_ERR(soc_dev);
178 dev = soc_device_to_device(soc_dev);
180 dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
181 soc_dev_attr->soc_id,
182 socinfo_to_major(socinfo),
183 socinfo_to_minor(socinfo),
184 socinfo_to_pack(socinfo),
185 socinfo_to_misc(socinfo));
189 device_initcall(meson_gx_socinfo_init);