1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Copyright 2019 IBM Corp. */ 3 4 #include <linux/io.h> 5 #include <linux/of.h> 6 #include <linux/of_address.h> 7 #include <linux/of_platform.h> 8 #include <linux/platform_device.h> 9 #include <linux/slab.h> 10 #include <linux/sys_soc.h> 11 12 static struct { 13 const char *name; 14 const u32 id; 15 } const rev_table[] = { 16 /* AST2400 */ 17 { "AST2400", 0x02000303 }, 18 { "AST1400", 0x02010103 }, 19 { "AST1250", 0x02010303 }, 20 /* AST2500 */ 21 { "AST2500", 0x04000303 }, 22 { "AST2510", 0x04000103 }, 23 { "AST2520", 0x04000203 }, 24 { "AST2530", 0x04000403 }, 25 /* AST2600 */ 26 { "AST2600", 0x05000303 }, 27 { "AST2620", 0x05010203 }, 28 { "AST2605", 0x05030103 }, 29 }; 30 31 static const char *siliconid_to_name(u32 siliconid) 32 { 33 unsigned int id = siliconid & 0xff00ffff; 34 unsigned int i; 35 36 for (i = 0 ; i < ARRAY_SIZE(rev_table) ; ++i) { 37 if (rev_table[i].id == id) 38 return rev_table[i].name; 39 } 40 41 return "Unknown"; 42 } 43 44 static const char *siliconid_to_rev(u32 siliconid) 45 { 46 unsigned int rev = (siliconid >> 16) & 0xff; 47 unsigned int gen = (siliconid >> 24) & 0xff; 48 49 if (gen < 0x5) { 50 /* AST2500 and below */ 51 switch (rev) { 52 case 0: 53 return "A0"; 54 case 1: 55 return "A1"; 56 case 3: 57 return "A2"; 58 } 59 } else { 60 /* AST2600 */ 61 switch (rev) { 62 case 0: 63 return "A0"; 64 case 1: 65 return "A1"; 66 case 2: 67 return "A2"; 68 case 3: 69 return "A3"; 70 } 71 } 72 73 return "??"; 74 } 75 76 static int __init aspeed_socinfo_init(void) 77 { 78 struct soc_device_attribute *attrs; 79 struct soc_device *soc_dev; 80 struct device_node *np; 81 void __iomem *reg; 82 bool has_chipid = false; 83 u32 siliconid; 84 u32 chipid[2]; 85 const char *machine = NULL; 86 87 np = of_find_compatible_node(NULL, NULL, "aspeed,silicon-id"); 88 if (!of_device_is_available(np)) { 89 of_node_put(np); 90 return -ENODEV; 91 } 92 93 reg = of_iomap(np, 0); 94 if (!reg) { 95 of_node_put(np); 96 return -ENODEV; 97 } 98 siliconid = readl(reg); 99 iounmap(reg); 100 101 /* This is optional, the ast2400 does not have it */ 102 reg = of_iomap(np, 1); 103 if (reg) { 104 has_chipid = true; 105 chipid[0] = readl(reg); 106 chipid[1] = readl(reg + 4); 107 iounmap(reg); 108 } 109 of_node_put(np); 110 111 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); 112 if (!attrs) 113 return -ENODEV; 114 115 /* 116 * Machine: Romulus BMC 117 * Family: AST2500 118 * Revision: A1 119 * SoC ID: raw silicon revision id 120 * Serial Number: 64-bit chipid 121 */ 122 123 np = of_find_node_by_path("/"); 124 of_property_read_string(np, "model", &machine); 125 if (machine) 126 attrs->machine = kstrdup(machine, GFP_KERNEL); 127 of_node_put(np); 128 129 attrs->family = siliconid_to_name(siliconid); 130 attrs->revision = siliconid_to_rev(siliconid); 131 attrs->soc_id = kasprintf(GFP_KERNEL, "%08x", siliconid); 132 133 if (has_chipid) 134 attrs->serial_number = kasprintf(GFP_KERNEL, "%08x%08x", 135 chipid[1], chipid[0]); 136 137 soc_dev = soc_device_register(attrs); 138 if (IS_ERR(soc_dev)) { 139 kfree(attrs->soc_id); 140 kfree(attrs->serial_number); 141 kfree(attrs); 142 return PTR_ERR(soc_dev); 143 } 144 145 pr_info("ASPEED %s rev %s (%s)\n", 146 attrs->family, 147 attrs->revision, 148 attrs->soc_id); 149 150 return 0; 151 } 152 early_initcall(aspeed_socinfo_init); 153