xref: /openbmc/u-boot/arch/x86/cpu/cpu_x86.c (revision 699c4e59)
1 /*
2  * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <cpu.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <asm/cpu.h>
12 
13 DECLARE_GLOBAL_DATA_PTR;
14 
15 int cpu_x86_bind(struct udevice *dev)
16 {
17 	struct cpu_platdata *plat = dev_get_parent_platdata(dev);
18 
19 	plat->cpu_id = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
20 				      "intel,apic-id", -1);
21 
22 	return 0;
23 }
24 
25 int cpu_x86_get_desc(struct udevice *dev, char *buf, int size)
26 {
27 	if (size < CPU_MAX_NAME_LEN)
28 		return -ENOSPC;
29 
30 	cpu_get_name(buf);
31 
32 	return 0;
33 }
34 
35 static int cpu_x86_get_count(struct udevice *dev)
36 {
37 	int node, cpu;
38 	int num = 0;
39 
40 	node = fdt_path_offset(gd->fdt_blob, "/cpus");
41 	if (node < 0)
42 		return -ENOENT;
43 
44 	for (cpu = fdt_first_subnode(gd->fdt_blob, node);
45 	     cpu >= 0;
46 	     cpu = fdt_next_subnode(gd->fdt_blob, cpu)) {
47 		const char *device_type;
48 
49 		device_type = fdt_getprop(gd->fdt_blob, cpu,
50 					  "device_type", NULL);
51 		if (!device_type)
52 			continue;
53 		if (strcmp(device_type, "cpu") == 0)
54 			num++;
55 	}
56 
57 	return num;
58 }
59 
60 static const struct cpu_ops cpu_x86_ops = {
61 	.get_desc	= cpu_x86_get_desc,
62 	.get_count	= cpu_x86_get_count,
63 };
64 
65 static const struct udevice_id cpu_x86_ids[] = {
66 	{ .compatible = "cpu-x86" },
67 	{ }
68 };
69 
70 U_BOOT_DRIVER(cpu_x86_drv) = {
71 	.name		= "cpu_x86",
72 	.id		= UCLASS_CPU,
73 	.of_match	= cpu_x86_ids,
74 	.bind		= cpu_x86_bind,
75 	.ops		= &cpu_x86_ops,
76 };
77