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1// SPDX-License-Identifier: GPL-2.0-or-later2/* 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 12static 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 { "AST2625", 0x05030403 },30};31 32static const char *siliconid_to_name(u32 siliconid)33{34 unsigned int id = siliconid & 0xff00ffff;35 unsigned int i;36 37 for (i = 0 ; i < ARRAY_SIZE(rev_table) ; ++i) {38 if (rev_table[i].id == id)39 return rev_table[i].name;40 }41 42 return "Unknown";43}44 45static const char *siliconid_to_rev(u32 siliconid)46{47 unsigned int rev = (siliconid >> 16) & 0xff;48 unsigned int gen = (siliconid >> 24) & 0xff;49 50 if (gen < 0x5) {51 /* AST2500 and below */52 switch (rev) {53 case 0:54 return "A0";55 case 1:56 return "A1";57 case 3:58 return "A2";59 }60 } else {61 /* AST2600 */62 switch (rev) {63 case 0:64 return "A0";65 case 1:66 return "A1";67 case 2:68 return "A2";69 case 3:70 return "A3";71 }72 }73 74 return "??";75}76 77static int __init aspeed_socinfo_init(void)78{79 struct soc_device_attribute *attrs;80 struct soc_device *soc_dev;81 struct device_node *np;82 void __iomem *reg;83 bool has_chipid = false;84 u32 siliconid;85 u32 chipid[2];86 const char *machine = NULL;87 88 np = of_find_compatible_node(NULL, NULL, "aspeed,silicon-id");89 if (!of_device_is_available(np)) {90 of_node_put(np);91 return -ENODEV;92 }93 94 reg = of_iomap(np, 0);95 if (!reg) {96 of_node_put(np);97 return -ENODEV;98 }99 siliconid = readl(reg);100 iounmap(reg);101 102 /* This is optional, the ast2400 does not have it */103 reg = of_iomap(np, 1);104 if (reg) {105 has_chipid = true;106 chipid[0] = readl(reg);107 chipid[1] = readl(reg + 4);108 iounmap(reg);109 }110 of_node_put(np);111 112 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);113 if (!attrs)114 return -ENODEV;115 116 /*117 * Machine: Romulus BMC118 * Family: AST2500119 * Revision: A1120 * SoC ID: raw silicon revision id121 * Serial Number: 64-bit chipid122 */123 124 np = of_find_node_by_path("/");125 of_property_read_string(np, "model", &machine);126 if (machine)127 attrs->machine = kstrdup(machine, GFP_KERNEL);128 of_node_put(np);129 130 attrs->family = siliconid_to_name(siliconid);131 attrs->revision = siliconid_to_rev(siliconid);132 attrs->soc_id = kasprintf(GFP_KERNEL, "%08x", siliconid);133 134 if (has_chipid)135 attrs->serial_number = kasprintf(GFP_KERNEL, "%08x%08x",136 chipid[1], chipid[0]);137 138 soc_dev = soc_device_register(attrs);139 if (IS_ERR(soc_dev)) {140 kfree(attrs->machine);141 kfree(attrs->soc_id);142 kfree(attrs->serial_number);143 kfree(attrs);144 return PTR_ERR(soc_dev);145 }146 147 pr_info("ASPEED %s rev %s (%s)\n",148 attrs->family,149 attrs->revision,150 attrs->soc_id);151 152 return 0;153}154early_initcall(aspeed_socinfo_init);155