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 }; 41 42 static const struct meson_gx_package_id { 43 const char *name; 44 unsigned int major_id; 45 unsigned int pack_id; 46 } soc_packages[] = { 47 { "S905", 0x1f, 0 }, 48 { "S905H", 0x1f, 0x13 }, 49 { "S905M", 0x1f, 0x20 }, 50 { "S905D", 0x21, 0 }, 51 { "S905X", 0x21, 0x80 }, 52 { "S905W", 0x21, 0xa0 }, 53 { "S905L", 0x21, 0xc0 }, 54 { "S905M2", 0x21, 0xe0 }, 55 { "S912", 0x22, 0 }, 56 { "962X", 0x24, 0x10 }, 57 { "962E", 0x24, 0x20 }, 58 { "A113X", 0x25, 0x37 }, 59 { "A113D", 0x25, 0x22 }, 60 }; 61 62 static inline unsigned int socinfo_to_major(u32 socinfo) 63 { 64 return FIELD_GET(SOCINFO_MAJOR, socinfo); 65 } 66 67 static inline unsigned int socinfo_to_minor(u32 socinfo) 68 { 69 return FIELD_GET(SOCINFO_MINOR, socinfo); 70 } 71 72 static inline unsigned int socinfo_to_pack(u32 socinfo) 73 { 74 return FIELD_GET(SOCINFO_PACK, socinfo); 75 } 76 77 static inline unsigned int socinfo_to_misc(u32 socinfo) 78 { 79 return FIELD_GET(SOCINFO_MISC, socinfo); 80 } 81 82 static const char *socinfo_to_package_id(u32 socinfo) 83 { 84 unsigned int pack = socinfo_to_pack(socinfo) & 0xf0; 85 unsigned int major = socinfo_to_major(socinfo); 86 int i; 87 88 for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) { 89 if (soc_packages[i].major_id == major && 90 soc_packages[i].pack_id == pack) 91 return soc_packages[i].name; 92 } 93 94 return "Unknown"; 95 } 96 97 static const char *socinfo_to_soc_id(u32 socinfo) 98 { 99 unsigned int id = socinfo_to_major(socinfo); 100 int i; 101 102 for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) { 103 if (soc_ids[i].id == id) 104 return soc_ids[i].name; 105 } 106 107 return "Unknown"; 108 } 109 110 static int __init meson_gx_socinfo_init(void) 111 { 112 struct soc_device_attribute *soc_dev_attr; 113 struct soc_device *soc_dev; 114 struct device_node *np; 115 struct regmap *regmap; 116 unsigned int socinfo; 117 struct device *dev; 118 int ret; 119 120 /* look up for chipid node */ 121 np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure"); 122 if (!np) 123 return -ENODEV; 124 125 /* check if interface is enabled */ 126 if (!of_device_is_available(np)) 127 return -ENODEV; 128 129 /* check if chip-id is available */ 130 if (!of_property_read_bool(np, "amlogic,has-chip-id")) 131 return -ENODEV; 132 133 /* node should be a syscon */ 134 regmap = syscon_node_to_regmap(np); 135 of_node_put(np); 136 if (IS_ERR(regmap)) { 137 pr_err("%s: failed to get regmap\n", __func__); 138 return -ENODEV; 139 } 140 141 ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo); 142 if (ret < 0) 143 return ret; 144 145 if (!socinfo) { 146 pr_err("%s: invalid chipid value\n", __func__); 147 return -EINVAL; 148 } 149 150 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 151 if (!soc_dev_attr) 152 return -ENODEV; 153 154 soc_dev_attr->family = "Amlogic Meson"; 155 156 np = of_find_node_by_path("/"); 157 of_property_read_string(np, "model", &soc_dev_attr->machine); 158 of_node_put(np); 159 160 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x", 161 socinfo_to_major(socinfo), 162 socinfo_to_minor(socinfo), 163 socinfo_to_pack(socinfo), 164 socinfo_to_misc(socinfo)); 165 soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)", 166 socinfo_to_soc_id(socinfo), 167 socinfo_to_package_id(socinfo)); 168 169 soc_dev = soc_device_register(soc_dev_attr); 170 if (IS_ERR(soc_dev)) { 171 kfree(soc_dev_attr->revision); 172 kfree_const(soc_dev_attr->soc_id); 173 kfree(soc_dev_attr); 174 return PTR_ERR(soc_dev); 175 } 176 dev = soc_device_to_device(soc_dev); 177 178 dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n", 179 soc_dev_attr->soc_id, 180 socinfo_to_major(socinfo), 181 socinfo_to_minor(socinfo), 182 socinfo_to_pack(socinfo), 183 socinfo_to_misc(socinfo)); 184 185 return 0; 186 } 187 device_initcall(meson_gx_socinfo_init); 188