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 }; 29 30 static const char *siliconid_to_name(u32 siliconid) 31 { 32 unsigned int id = siliconid & 0xff00ffff; 33 unsigned int i; 34 35 for (i = 0 ; i < ARRAY_SIZE(rev_table) ; ++i) { 36 if (rev_table[i].id == id) 37 return rev_table[i].name; 38 } 39 40 return "Unknown"; 41 } 42 43 static const char *siliconid_to_rev(u32 siliconid) 44 { 45 unsigned int rev = (siliconid >> 16) & 0xff; 46 47 switch (rev) { 48 case 0: 49 return "A0"; 50 case 1: 51 return "A1"; 52 case 3: 53 return "A2"; 54 } 55 56 return "??"; 57 } 58 59 static int __init aspeed_socinfo_init(void) 60 { 61 struct soc_device_attribute *attrs; 62 struct soc_device *soc_dev; 63 struct device_node *np; 64 void __iomem *reg; 65 bool has_chipid = false; 66 u32 siliconid; 67 u32 chipid[2]; 68 const char *machine = NULL; 69 70 np = of_find_compatible_node(NULL, NULL, "aspeed,silicon-id"); 71 if (!of_device_is_available(np)) { 72 of_node_put(np); 73 return -ENODEV; 74 } 75 76 reg = of_iomap(np, 0); 77 if (!reg) { 78 of_node_put(np); 79 return -ENODEV; 80 } 81 siliconid = readl(reg); 82 iounmap(reg); 83 84 /* This is optional, the ast2400 does not have it */ 85 reg = of_iomap(np, 1); 86 if (reg) { 87 has_chipid = true; 88 chipid[0] = readl(reg); 89 chipid[1] = readl(reg + 4); 90 iounmap(reg); 91 } 92 of_node_put(np); 93 94 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); 95 if (!attrs) 96 return -ENODEV; 97 98 /* 99 * Machine: Romulus BMC 100 * Family: AST2500 101 * Revision: A1 102 * SoC ID: raw silicon revision id 103 * Serial Number: 64-bit chipid 104 */ 105 106 np = of_find_node_by_path("/"); 107 of_property_read_string(np, "model", &machine); 108 if (machine) 109 attrs->machine = kstrdup(machine, GFP_KERNEL); 110 of_node_put(np); 111 112 attrs->family = siliconid_to_name(siliconid); 113 attrs->revision = siliconid_to_rev(siliconid); 114 attrs->soc_id = kasprintf(GFP_KERNEL, "%08x", siliconid); 115 116 if (has_chipid) 117 attrs->serial_number = kasprintf(GFP_KERNEL, "%08x%08x", 118 chipid[1], chipid[0]); 119 120 soc_dev = soc_device_register(attrs); 121 if (IS_ERR(soc_dev)) { 122 kfree(attrs->soc_id); 123 kfree(attrs->serial_number); 124 kfree(attrs); 125 return PTR_ERR(soc_dev); 126 } 127 128 pr_info("ASPEED %s rev %s (%s)\n", 129 attrs->family, 130 attrs->revision, 131 attrs->soc_id); 132 133 return 0; 134 } 135 early_initcall(aspeed_socinfo_init); 136