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 { "A1", 0x2c }, 44 }; 45 46 static const struct meson_gx_package_id { 47 const char *name; 48 unsigned int major_id; 49 unsigned int pack_id; 50 unsigned int pack_mask; 51 } soc_packages[] = { 52 { "S905", 0x1f, 0, 0x20 }, /* pack_id != 0x20 */ 53 { "S905H", 0x1f, 0x3, 0xf }, /* pack_id & 0xf == 0x3 */ 54 { "S905M", 0x1f, 0x20, 0xf0 }, /* pack_id == 0x20 */ 55 { "S905D", 0x21, 0, 0xf0 }, 56 { "S905X", 0x21, 0x80, 0xf0 }, 57 { "S905W", 0x21, 0xa0, 0xf0 }, 58 { "S905L", 0x21, 0xc0, 0xf0 }, 59 { "S905M2", 0x21, 0xe0, 0xf0 }, 60 { "S805X", 0x21, 0x30, 0xf0 }, 61 { "S805Y", 0x21, 0xb0, 0xf0 }, 62 { "S912", 0x22, 0, 0x0 }, /* Only S912 is known for GXM */ 63 { "962X", 0x24, 0x10, 0xf0 }, 64 { "962E", 0x24, 0x20, 0xf0 }, 65 { "A113X", 0x25, 0x37, 0xff }, 66 { "A113D", 0x25, 0x22, 0xff }, 67 { "S905L", 0x26, 0, 0x0 }, 68 { "S905D2", 0x28, 0x10, 0xf0 }, 69 { "S905Y2", 0x28, 0x30, 0xf0 }, 70 { "S905X2", 0x28, 0x40, 0xf0 }, 71 { "A311D", 0x29, 0x10, 0xf0 }, 72 { "S922X", 0x29, 0x40, 0xf0 }, 73 { "S905D3", 0x2b, 0x4, 0xf5 }, 74 { "S905X3", 0x2b, 0x5, 0xf5 }, 75 { "S905X3", 0x2b, 0x10, 0x3f }, 76 { "S905D3", 0x2b, 0x30, 0x3f }, 77 { "A113L", 0x2c, 0x0, 0xf8 }, 78 }; 79 80 static inline unsigned int socinfo_to_major(u32 socinfo) 81 { 82 return FIELD_GET(SOCINFO_MAJOR, socinfo); 83 } 84 85 static inline unsigned int socinfo_to_minor(u32 socinfo) 86 { 87 return FIELD_GET(SOCINFO_MINOR, socinfo); 88 } 89 90 static inline unsigned int socinfo_to_pack(u32 socinfo) 91 { 92 return FIELD_GET(SOCINFO_PACK, socinfo); 93 } 94 95 static inline unsigned int socinfo_to_misc(u32 socinfo) 96 { 97 return FIELD_GET(SOCINFO_MISC, socinfo); 98 } 99 100 static const char *socinfo_to_package_id(u32 socinfo) 101 { 102 unsigned int pack = socinfo_to_pack(socinfo); 103 unsigned int major = socinfo_to_major(socinfo); 104 int i; 105 106 for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) { 107 if (soc_packages[i].major_id == major && 108 soc_packages[i].pack_id == 109 (pack & soc_packages[i].pack_mask)) 110 return soc_packages[i].name; 111 } 112 113 return "Unknown"; 114 } 115 116 static const char *socinfo_to_soc_id(u32 socinfo) 117 { 118 unsigned int id = socinfo_to_major(socinfo); 119 int i; 120 121 for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) { 122 if (soc_ids[i].id == id) 123 return soc_ids[i].name; 124 } 125 126 return "Unknown"; 127 } 128 129 static int __init meson_gx_socinfo_init(void) 130 { 131 struct soc_device_attribute *soc_dev_attr; 132 struct soc_device *soc_dev; 133 struct device_node *np; 134 struct regmap *regmap; 135 unsigned int socinfo; 136 struct device *dev; 137 int ret; 138 139 /* look up for chipid node */ 140 np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure"); 141 if (!np) 142 return -ENODEV; 143 144 /* check if interface is enabled */ 145 if (!of_device_is_available(np)) { 146 of_node_put(np); 147 return -ENODEV; 148 } 149 150 /* check if chip-id is available */ 151 if (!of_property_read_bool(np, "amlogic,has-chip-id")) { 152 of_node_put(np); 153 return -ENODEV; 154 } 155 156 /* node should be a syscon */ 157 regmap = syscon_node_to_regmap(np); 158 of_node_put(np); 159 if (IS_ERR(regmap)) { 160 pr_err("%s: failed to get regmap\n", __func__); 161 return -ENODEV; 162 } 163 164 ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo); 165 if (ret < 0) 166 return ret; 167 168 if (!socinfo) { 169 pr_err("%s: invalid chipid value\n", __func__); 170 return -EINVAL; 171 } 172 173 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 174 if (!soc_dev_attr) 175 return -ENODEV; 176 177 soc_dev_attr->family = "Amlogic Meson"; 178 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x", 179 socinfo_to_major(socinfo), 180 socinfo_to_minor(socinfo), 181 socinfo_to_pack(socinfo), 182 socinfo_to_misc(socinfo)); 183 soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)", 184 socinfo_to_soc_id(socinfo), 185 socinfo_to_package_id(socinfo)); 186 187 soc_dev = soc_device_register(soc_dev_attr); 188 if (IS_ERR(soc_dev)) { 189 kfree(soc_dev_attr->revision); 190 kfree_const(soc_dev_attr->soc_id); 191 kfree(soc_dev_attr); 192 return PTR_ERR(soc_dev); 193 } 194 dev = soc_device_to_device(soc_dev); 195 196 dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n", 197 soc_dev_attr->soc_id, 198 socinfo_to_major(socinfo), 199 socinfo_to_minor(socinfo), 200 socinfo_to_pack(socinfo), 201 socinfo_to_misc(socinfo)); 202 203 return 0; 204 } 205 device_initcall(meson_gx_socinfo_init); 206