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 	{ "AST2625", 0x05030403 },
30 };
31 
32 static 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 
45 static 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 
77 static 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 BMC
118 	 * Family: AST2500
119 	 * Revision: A1
120 	 * SoC ID: raw silicon revision id
121 	 * Serial Number: 64-bit chipid
122 	 */
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 }
154 early_initcall(aspeed_socinfo_init);
155