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[J-linux.git] / drivers / soc / aspeed / aspeed-socinfo.c
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 };
30
31 static const char *siliconid_to_name(u32 siliconid)
32 {
33         unsigned int id = siliconid & 0xff00ffff;
34         unsigned int i;
35
36         for (i = 0 ; i < ARRAY_SIZE(rev_table) ; ++i) {
37                 if (rev_table[i].id == id)
38                         return rev_table[i].name;
39         }
40
41         return "Unknown";
42 }
43
44 static const char *siliconid_to_rev(u32 siliconid)
45 {
46         unsigned int rev = (siliconid >> 16) & 0xff;
47         unsigned int gen = (siliconid >> 24) & 0xff;
48
49         if (gen < 0x5) {
50                 /* AST2500 and below */
51                 switch (rev) {
52                 case 0:
53                         return "A0";
54                 case 1:
55                         return "A1";
56                 case 3:
57                         return "A2";
58                 }
59         } else {
60                 /* AST2600 */
61                 switch (rev) {
62                 case 0:
63                         return "A0";
64                 case 1:
65                         return "A1";
66                 case 2:
67                         return "A2";
68                 case 3:
69                         return "A3";
70                 }
71         }
72
73         return "??";
74 }
75
76 static int __init aspeed_socinfo_init(void)
77 {
78         struct soc_device_attribute *attrs;
79         struct soc_device *soc_dev;
80         struct device_node *np;
81         void __iomem *reg;
82         bool has_chipid = false;
83         u32 siliconid;
84         u32 chipid[2];
85         const char *machine = NULL;
86
87         np = of_find_compatible_node(NULL, NULL, "aspeed,silicon-id");
88         if (!of_device_is_available(np)) {
89                 of_node_put(np);
90                 return -ENODEV;
91         }
92
93         reg = of_iomap(np, 0);
94         if (!reg) {
95                 of_node_put(np);
96                 return -ENODEV;
97         }
98         siliconid = readl(reg);
99         iounmap(reg);
100
101         /* This is optional, the ast2400 does not have it */
102         reg = of_iomap(np, 1);
103         if (reg) {
104                 has_chipid = true;
105                 chipid[0] = readl(reg);
106                 chipid[1] = readl(reg + 4);
107                 iounmap(reg);
108         }
109         of_node_put(np);
110
111         attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
112         if (!attrs)
113                 return -ENODEV;
114
115         /*
116          * Machine: Romulus BMC
117          * Family: AST2500
118          * Revision: A1
119          * SoC ID: raw silicon revision id
120          * Serial Number: 64-bit chipid
121          */
122
123         np = of_find_node_by_path("/");
124         of_property_read_string(np, "model", &machine);
125         if (machine)
126                 attrs->machine = kstrdup(machine, GFP_KERNEL);
127         of_node_put(np);
128
129         attrs->family = siliconid_to_name(siliconid);
130         attrs->revision = siliconid_to_rev(siliconid);
131         attrs->soc_id = kasprintf(GFP_KERNEL, "%08x", siliconid);
132
133         if (has_chipid)
134                 attrs->serial_number = kasprintf(GFP_KERNEL, "%08x%08x",
135                                                  chipid[1], chipid[0]);
136
137         soc_dev = soc_device_register(attrs);
138         if (IS_ERR(soc_dev)) {
139                 kfree(attrs->soc_id);
140                 kfree(attrs->serial_number);
141                 kfree(attrs);
142                 return PTR_ERR(soc_dev);
143         }
144
145         pr_info("ASPEED %s rev %s (%s)\n",
146                         attrs->family,
147                         attrs->revision,
148                         attrs->soc_id);
149
150         return 0;
151 }
152 early_initcall(aspeed_socinfo_init);
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