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 unsigned int pack_mask; 47 } soc_packages[] = { 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 }, 61 }; 62 63 static inline unsigned int socinfo_to_major(u32 socinfo) 64 { 65 return FIELD_GET(SOCINFO_MAJOR, socinfo); 66 } 67 68 static inline unsigned int socinfo_to_minor(u32 socinfo) 69 { 70 return FIELD_GET(SOCINFO_MINOR, socinfo); 71 } 72 73 static inline unsigned int socinfo_to_pack(u32 socinfo) 74 { 75 return FIELD_GET(SOCINFO_PACK, socinfo); 76 } 77 78 static inline unsigned int socinfo_to_misc(u32 socinfo) 79 { 80 return FIELD_GET(SOCINFO_MISC, socinfo); 81 } 82 83 static const char *socinfo_to_package_id(u32 socinfo) 84 { 85 unsigned int pack = socinfo_to_pack(socinfo); 86 unsigned int major = socinfo_to_major(socinfo); 87 int i; 88 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; 94 } 95 96 return "Unknown"; 97 } 98 99 static const char *socinfo_to_soc_id(u32 socinfo) 100 { 101 unsigned int id = socinfo_to_major(socinfo); 102 int i; 103 104 for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) { 105 if (soc_ids[i].id == id) 106 return soc_ids[i].name; 107 } 108 109 return "Unknown"; 110 } 111 112 static int __init meson_gx_socinfo_init(void) 113 { 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; 119 struct device *dev; 120 int ret; 121 122 /* look up for chipid node */ 123 np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure"); 124 if (!np) 125 return -ENODEV; 126 127 /* check if interface is enabled */ 128 if (!of_device_is_available(np)) 129 return -ENODEV; 130 131 /* check if chip-id is available */ 132 if (!of_property_read_bool(np, "amlogic,has-chip-id")) 133 return -ENODEV; 134 135 /* node should be a syscon */ 136 regmap = syscon_node_to_regmap(np); 137 of_node_put(np); 138 if (IS_ERR(regmap)) { 139 pr_err("%s: failed to get regmap\n", __func__); 140 return -ENODEV; 141 } 142 143 ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo); 144 if (ret < 0) 145 return ret; 146 147 if (!socinfo) { 148 pr_err("%s: invalid chipid value\n", __func__); 149 return -EINVAL; 150 } 151 152 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 153 if (!soc_dev_attr) 154 return -ENODEV; 155 156 soc_dev_attr->family = "Amlogic Meson"; 157 158 np = of_find_node_by_path("/"); 159 of_property_read_string(np, "model", &soc_dev_attr->machine); 160 of_node_put(np); 161 162 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)); 170 171 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); 175 kfree(soc_dev_attr); 176 return PTR_ERR(soc_dev); 177 } 178 dev = soc_device_to_device(soc_dev); 179 180 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)); 186 187 return 0; 188 } 189 device_initcall(meson_gx_socinfo_init); 190