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 { "G12A", 0x28 }, 41 { "G12B", 0x29 }, 42 { "SM1", 0x2b }, 43 }; 44 45 static const struct meson_gx_package_id { 46 const char *name; 47 unsigned int major_id; 48 unsigned int pack_id; 49 unsigned int pack_mask; 50 } soc_packages[] = { 51 { "S905", 0x1f, 0, 0x20 }, /* pack_id != 0x20 */ 52 { "S905H", 0x1f, 0x3, 0xf }, /* pack_id & 0xf == 0x3 */ 53 { "S905M", 0x1f, 0x20, 0xf0 }, /* pack_id == 0x20 */ 54 { "S905D", 0x21, 0, 0xf0 }, 55 { "S905X", 0x21, 0x80, 0xf0 }, 56 { "S905W", 0x21, 0xa0, 0xf0 }, 57 { "S905L", 0x21, 0xc0, 0xf0 }, 58 { "S905M2", 0x21, 0xe0, 0xf0 }, 59 { "S805X", 0x21, 0x30, 0xf0 }, 60 { "S805Y", 0x21, 0xb0, 0xf0 }, 61 { "S912", 0x22, 0, 0x0 }, /* Only S912 is known for GXM */ 62 { "962X", 0x24, 0x10, 0xf0 }, 63 { "962E", 0x24, 0x20, 0xf0 }, 64 { "A113X", 0x25, 0x37, 0xff }, 65 { "A113D", 0x25, 0x22, 0xff }, 66 { "S905D2", 0x28, 0x10, 0xf0 }, 67 { "S905X2", 0x28, 0x40, 0xf0 }, 68 { "S922X", 0x29, 0x40, 0xf0 }, 69 { "A311D", 0x29, 0x10, 0xf0 }, 70 { "S905X3", 0x2b, 0x5, 0xf }, 71 }; 72 73 static inline unsigned int socinfo_to_major(u32 socinfo) 74 { 75 return FIELD_GET(SOCINFO_MAJOR, socinfo); 76 } 77 78 static inline unsigned int socinfo_to_minor(u32 socinfo) 79 { 80 return FIELD_GET(SOCINFO_MINOR, socinfo); 81 } 82 83 static inline unsigned int socinfo_to_pack(u32 socinfo) 84 { 85 return FIELD_GET(SOCINFO_PACK, socinfo); 86 } 87 88 static inline unsigned int socinfo_to_misc(u32 socinfo) 89 { 90 return FIELD_GET(SOCINFO_MISC, socinfo); 91 } 92 93 static const char *socinfo_to_package_id(u32 socinfo) 94 { 95 unsigned int pack = socinfo_to_pack(socinfo); 96 unsigned int major = socinfo_to_major(socinfo); 97 int i; 98 99 for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) { 100 if (soc_packages[i].major_id == major && 101 soc_packages[i].pack_id == 102 (pack & soc_packages[i].pack_mask)) 103 return soc_packages[i].name; 104 } 105 106 return "Unknown"; 107 } 108 109 static const char *socinfo_to_soc_id(u32 socinfo) 110 { 111 unsigned int id = socinfo_to_major(socinfo); 112 int i; 113 114 for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) { 115 if (soc_ids[i].id == id) 116 return soc_ids[i].name; 117 } 118 119 return "Unknown"; 120 } 121 122 static int __init meson_gx_socinfo_init(void) 123 { 124 struct soc_device_attribute *soc_dev_attr; 125 struct soc_device *soc_dev; 126 struct device_node *np; 127 struct regmap *regmap; 128 unsigned int socinfo; 129 struct device *dev; 130 int ret; 131 132 /* look up for chipid node */ 133 np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure"); 134 if (!np) 135 return -ENODEV; 136 137 /* check if interface is enabled */ 138 if (!of_device_is_available(np)) { 139 of_node_put(np); 140 return -ENODEV; 141 } 142 143 /* check if chip-id is available */ 144 if (!of_property_read_bool(np, "amlogic,has-chip-id")) { 145 of_node_put(np); 146 return -ENODEV; 147 } 148 149 /* node should be a syscon */ 150 regmap = syscon_node_to_regmap(np); 151 of_node_put(np); 152 if (IS_ERR(regmap)) { 153 pr_err("%s: failed to get regmap\n", __func__); 154 return -ENODEV; 155 } 156 157 ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo); 158 if (ret < 0) 159 return ret; 160 161 if (!socinfo) { 162 pr_err("%s: invalid chipid value\n", __func__); 163 return -EINVAL; 164 } 165 166 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 167 if (!soc_dev_attr) 168 return -ENODEV; 169 170 soc_dev_attr->family = "Amlogic Meson"; 171 172 np = of_find_node_by_path("/"); 173 of_property_read_string(np, "model", &soc_dev_attr->machine); 174 of_node_put(np); 175 176 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x", 177 socinfo_to_major(socinfo), 178 socinfo_to_minor(socinfo), 179 socinfo_to_pack(socinfo), 180 socinfo_to_misc(socinfo)); 181 soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)", 182 socinfo_to_soc_id(socinfo), 183 socinfo_to_package_id(socinfo)); 184 185 soc_dev = soc_device_register(soc_dev_attr); 186 if (IS_ERR(soc_dev)) { 187 kfree(soc_dev_attr->revision); 188 kfree_const(soc_dev_attr->soc_id); 189 kfree(soc_dev_attr); 190 return PTR_ERR(soc_dev); 191 } 192 dev = soc_device_to_device(soc_dev); 193 194 dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n", 195 soc_dev_attr->soc_id, 196 socinfo_to_major(socinfo), 197 socinfo_to_minor(socinfo), 198 socinfo_to_pack(socinfo), 199 socinfo_to_misc(socinfo)); 200 201 return 0; 202 } 203 device_initcall(meson_gx_socinfo_init); 204