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
siliconid_to_name(u32 siliconid)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
siliconid_to_rev(u32 siliconid)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
aspeed_socinfo_init(void)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