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 }; 37 38 static const struct meson_gx_package_id { 39 const char *name; 40 unsigned int major_id; 41 unsigned int pack_id; 42 } soc_packages[] = { 43 { "S905", 0x1f, 0 }, 44 { "S905H", 0x1f, 0x13 }, 45 { "S905M", 0x1f, 0x20 }, 46 { "S905D", 0x21, 0 }, 47 { "S905X", 0x21, 0x80 }, 48 { "S905L", 0x21, 0xc0 }, 49 { "S905M2", 0x21, 0xe0 }, 50 { "S912", 0x22, 0 }, 51 }; 52 53 static inline unsigned int socinfo_to_major(u32 socinfo) 54 { 55 return FIELD_GET(SOCINFO_MAJOR, socinfo); 56 } 57 58 static inline unsigned int socinfo_to_minor(u32 socinfo) 59 { 60 return FIELD_GET(SOCINFO_MINOR, socinfo); 61 } 62 63 static inline unsigned int socinfo_to_pack(u32 socinfo) 64 { 65 return FIELD_GET(SOCINFO_PACK, socinfo); 66 } 67 68 static inline unsigned int socinfo_to_misc(u32 socinfo) 69 { 70 return FIELD_GET(SOCINFO_MISC, socinfo); 71 } 72 73 static const char *socinfo_to_package_id(u32 socinfo) 74 { 75 unsigned int pack = socinfo_to_pack(socinfo) & 0xf0; 76 unsigned int major = socinfo_to_major(socinfo); 77 int i; 78 79 for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) { 80 if (soc_packages[i].major_id == major && 81 soc_packages[i].pack_id == pack) 82 return soc_packages[i].name; 83 } 84 85 return "Unknown"; 86 } 87 88 static const char *socinfo_to_soc_id(u32 socinfo) 89 { 90 unsigned int id = socinfo_to_major(socinfo); 91 int i; 92 93 for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) { 94 if (soc_ids[i].id == id) 95 return soc_ids[i].name; 96 } 97 98 return "Unknown"; 99 } 100 101 int __init meson_gx_socinfo_init(void) 102 { 103 struct soc_device_attribute *soc_dev_attr; 104 struct soc_device *soc_dev; 105 struct device_node *np; 106 struct regmap *regmap; 107 unsigned int socinfo; 108 struct device *dev; 109 int ret; 110 111 /* look up for chipid node */ 112 np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure"); 113 if (!np) 114 return -ENODEV; 115 116 /* check if interface is enabled */ 117 if (!of_device_is_available(np)) 118 return -ENODEV; 119 120 /* check if chip-id is available */ 121 if (!of_property_read_bool(np, "amlogic,has-chip-id")) 122 return -ENODEV; 123 124 /* node should be a syscon */ 125 regmap = syscon_node_to_regmap(np); 126 of_node_put(np); 127 if (IS_ERR(regmap)) { 128 pr_err("%s: failed to get regmap\n", __func__); 129 return -ENODEV; 130 } 131 132 ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo); 133 if (ret < 0) 134 return ret; 135 136 if (!socinfo) { 137 pr_err("%s: invalid chipid value\n", __func__); 138 return -EINVAL; 139 } 140 141 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 142 if (!soc_dev_attr) 143 return -ENODEV; 144 145 soc_dev_attr->family = "Amlogic Meson"; 146 147 np = of_find_node_by_path("/"); 148 of_property_read_string(np, "model", &soc_dev_attr->machine); 149 of_node_put(np); 150 151 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x", 152 socinfo_to_major(socinfo), 153 socinfo_to_minor(socinfo), 154 socinfo_to_pack(socinfo), 155 socinfo_to_misc(socinfo)); 156 soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)", 157 socinfo_to_soc_id(socinfo), 158 socinfo_to_package_id(socinfo)); 159 160 soc_dev = soc_device_register(soc_dev_attr); 161 if (IS_ERR(soc_dev)) { 162 kfree(soc_dev_attr->revision); 163 kfree_const(soc_dev_attr->soc_id); 164 kfree(soc_dev_attr); 165 return PTR_ERR(soc_dev); 166 } 167 dev = soc_device_to_device(soc_dev); 168 169 dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n", 170 soc_dev_attr->soc_id, 171 socinfo_to_major(socinfo), 172 socinfo_to_minor(socinfo), 173 socinfo_to_pack(socinfo), 174 socinfo_to_misc(socinfo)); 175 176 return 0; 177 } 178 device_initcall(meson_gx_socinfo_init); 179