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 /* AST2700 */
31 { "AST2750", 0x06000003 },
32 { "AST2700", 0x06000103 },
33 { "AST2720", 0x06000203 },
34 };
35
siliconid_to_name(u32 siliconid)36 static const char *siliconid_to_name(u32 siliconid)
37 {
38 unsigned int id = siliconid & 0xff00ffff;
39 unsigned int i;
40
41 for (i = 0 ; i < ARRAY_SIZE(rev_table) ; ++i) {
42 if (rev_table[i].id == id)
43 return rev_table[i].name;
44 }
45
46 return "Unknown";
47 }
48
siliconid_to_rev(u32 siliconid)49 static const char *siliconid_to_rev(u32 siliconid)
50 {
51 unsigned int rev = (siliconid >> 16) & 0xff;
52 unsigned int gen = (siliconid >> 24) & 0xff;
53
54 if (gen < 0x5) {
55 /* AST2500 and below */
56 switch (rev) {
57 case 0:
58 return "A0";
59 case 1:
60 return "A1";
61 case 3:
62 return "A2";
63 }
64 } else {
65 /* AST2600 */
66 switch (rev) {
67 case 0:
68 return "A0";
69 case 1:
70 return "A1";
71 case 2:
72 return "A2";
73 case 3:
74 return "A3";
75 }
76 }
77
78 return "??";
79 }
80
aspeed_socinfo_init(void)81 static int __init aspeed_socinfo_init(void)
82 {
83 struct soc_device_attribute *attrs;
84 struct soc_device *soc_dev;
85 struct device_node *np;
86 void __iomem *reg;
87 bool has_chipid = false;
88 u32 siliconid;
89 u32 chipid[2];
90 const char *machine = NULL;
91
92 np = of_find_compatible_node(NULL, NULL, "aspeed,silicon-id");
93 if (!of_device_is_available(np)) {
94 of_node_put(np);
95 return -ENODEV;
96 }
97
98 reg = of_iomap(np, 0);
99 if (!reg) {
100 of_node_put(np);
101 return -ENODEV;
102 }
103 siliconid = readl(reg);
104 iounmap(reg);
105
106 /* This is optional, the ast2400 does not have it */
107 reg = of_iomap(np, 1);
108 if (reg) {
109 has_chipid = true;
110 chipid[0] = readl(reg);
111 chipid[1] = readl(reg + 4);
112 iounmap(reg);
113 }
114 of_node_put(np);
115
116 attrs = kzalloc_obj(*attrs);
117 if (!attrs)
118 return -ENODEV;
119
120 /*
121 * Machine: Romulus BMC
122 * Family: AST2500
123 * Revision: A1
124 * SoC ID: raw silicon revision id
125 * Serial Number: 64-bit chipid
126 */
127
128 np = of_find_node_by_path("/");
129 of_property_read_string(np, "model", &machine);
130 if (machine)
131 attrs->machine = kstrdup(machine, GFP_KERNEL);
132 of_node_put(np);
133
134 attrs->family = siliconid_to_name(siliconid);
135 attrs->revision = siliconid_to_rev(siliconid);
136 attrs->soc_id = kasprintf(GFP_KERNEL, "%08x", siliconid);
137
138 if (has_chipid)
139 attrs->serial_number = kasprintf(GFP_KERNEL, "%08x%08x",
140 chipid[1], chipid[0]);
141
142 soc_dev = soc_device_register(attrs);
143 if (IS_ERR(soc_dev)) {
144 kfree(attrs->machine);
145 kfree(attrs->soc_id);
146 kfree(attrs->serial_number);
147 kfree(attrs);
148 return PTR_ERR(soc_dev);
149 }
150
151 pr_info("ASPEED %s rev %s (%s)\n",
152 attrs->family,
153 attrs->revision,
154 attrs->soc_id);
155
156 return 0;
157 }
158 early_initcall(aspeed_socinfo_init);
159