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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