1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015 Google, Inc
4 */
5
6 #include <common.h>
7 #include <cpu.h>
8 #include <dm.h>
9 #include <malloc.h>
10 #include <qfw.h>
11 #include <dm/lists.h>
12 #include <dm/uclass-internal.h>
13 #include <dm/root.h>
14
qemu_cpu_fixup(void)15 int qemu_cpu_fixup(void)
16 {
17 int ret;
18 int cpu_num;
19 int cpu_online;
20 struct uclass *uc;
21 struct udevice *dev, *pdev;
22 struct cpu_plat *plat;
23 char *cpu;
24
25 /* This will cause the CPUs devices to be bound */
26 ret = uclass_get(UCLASS_CPU, &uc);
27 if (ret)
28 return ret;
29
30 /* first we need to find '/cpus' */
31 for (device_find_first_child(dm_root(), &pdev);
32 pdev;
33 device_find_next_child(&pdev)) {
34 if (!strcmp(pdev->name, "cpus"))
35 break;
36 }
37 if (!pdev) {
38 printf("unable to find cpus device\n");
39 return -ENODEV;
40 }
41
42 /* calculate cpus that are already bound */
43 cpu_num = 0;
44 for (uclass_find_first_device(UCLASS_CPU, &dev);
45 dev;
46 uclass_find_next_device(&dev)) {
47 cpu_num++;
48 }
49
50 /* get actual cpu number */
51 cpu_online = qemu_fwcfg_online_cpus();
52 if (cpu_online < 0) {
53 printf("unable to get online cpu number: %d\n", cpu_online);
54 return cpu_online;
55 }
56
57 /* bind addtional cpus */
58 dev = NULL;
59 for (; cpu_num < cpu_online; cpu_num++) {
60 /*
61 * allocate device name here as device_bind_driver() does
62 * not copy device name, 8 bytes are enough for
63 * sizeof("cpu@") + 3 digits cpu number + '\0'
64 */
65 cpu = malloc(8);
66 if (!cpu) {
67 printf("unable to allocate device name\n");
68 return -ENOMEM;
69 }
70 sprintf(cpu, "cpu@%d", cpu_num);
71 ret = device_bind_driver(pdev, "cpu_qemu", cpu, &dev);
72 if (ret) {
73 printf("binding cpu@%d failed: %d\n", cpu_num, ret);
74 return ret;
75 }
76 plat = dev_get_parent_plat(dev);
77 plat->cpu_id = cpu_num;
78 }
79 return 0;
80 }
81