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"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6
7#define LOG_CATEGORY UCLASS_CPU
8
9#include <cpu.h>
10#include <dm.h>
11#include <errno.h>
12#include <log.h>
13#include <dm/lists.h>
14#include <dm/root.h>
15#include <linux/err.h>
16#include <relocate.h>
17
18DECLARE_GLOBAL_DATA_PTR;
19
20int cpu_probe_all(void)
21{
22 int ret = uclass_probe_all(UCLASS_CPU);
23
24 if (ret) {
25 debug("%s: Error while probing CPUs (err = %d %s)\n",
26 __func__, ret, errno_str(ret));
27 }
28 return ret;
29}
30
31int cpu_is_current(struct udevice *cpu)
32{
33 struct cpu_ops *ops = cpu_get_ops(cpu);
34
35 if (ops->is_current) {
36 if (ops->is_current(cpu))
37 return 1;
38 }
39
40 return -ENOSYS;
41}
42
43struct udevice *cpu_get_current_dev(void)
44{
45 struct udevice *cpu;
46 int ret;
47
48 uclass_foreach_dev_probe(UCLASS_CPU, cpu) {
49 if (cpu_is_current(cpu) > 0)
50 return cpu;
51 }
52
53 /* If can't find current cpu device, use the first dev instead */
54 ret = uclass_first_device_err(UCLASS_CPU, &cpu);
55 if (ret) {
56 debug("%s: Could not get CPU device (err = %d)\n",
57 __func__, ret);
58 return NULL;
59 }
60
61 return cpu;
62}
63
64int cpu_get_desc(const struct udevice *dev, char *buf, int size)
65{
66 struct cpu_ops *ops = cpu_get_ops(dev);
67
68 if (!ops->get_desc)
69 return -ENOSYS;
70
71 return ops->get_desc(dev, buf, size);
72}
73
74int cpu_get_info(const struct udevice *dev, struct cpu_info *info)
75{
76 struct cpu_ops *ops = cpu_get_ops(dev);
77
78 if (!ops->get_info)
79 return -ENOSYS;
80
81 /* Init cpu_info to 0 */
82 memset(info, 0, sizeof(struct cpu_info));
83
84 return ops->get_info(dev, info);
85}
86
87int cpu_get_count(const struct udevice *dev)
88{
89 struct cpu_ops *ops = cpu_get_ops(dev);
90
91 if (!ops->get_count)
92 return -ENOSYS;
93
94 return ops->get_count(dev);
95}
96
97int cpu_get_vendor(const struct udevice *dev, char *buf, int size)
98{
99 struct cpu_ops *ops = cpu_get_ops(dev);
100
101 if (!ops->get_vendor)
102 return -ENOSYS;
103
104 return ops->get_vendor(dev, buf, size);
105}
106
107int cpu_release_core(const struct udevice *dev, phys_addr_t addr)
108{
109 struct cpu_ops *ops = cpu_get_ops(dev);
110
111 if (!ops->release_core)
112 return -ENOSYS;
113
114 return ops->release_core(dev, addr);
115}
116
117U_BOOT_DRIVER(cpu_bus) = {
118 .name = "cpu_bus",
119 .id = UCLASS_SIMPLE_BUS,
120 .per_child_plat_auto = sizeof(struct cpu_plat),
121};
122
123static int uclass_cpu_init(struct uclass *uc)
124{
125 struct udevice *dev;
126 ofnode node;
127 int ret;
128
129 node = ofnode_path("/cpus");
130 if (!ofnode_valid(node))
131 return 0;
132
133 ret = device_bind_driver_to_node(dm_root(), "cpu_bus", "cpus", node,
134 &dev);
135
136 return ret;
137}
138
139UCLASS_DRIVER(cpu) = {
140 .id = UCLASS_CPU,
141 .name = "cpu",
142 .flags = DM_UC_FLAG_SEQ_ALIAS,
143 .init = uclass_cpu_init,
144};