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