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 #include <common.h>
8 #include <cpu.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <log.h>
12 #include <dm/lists.h>
13 #include <dm/root.h>
14 #include <linux/err.h>
15
cpu_probe_all(void)16 int cpu_probe_all(void)
17 {
18 struct udevice *cpu;
19 int ret;
20
21 ret = uclass_first_device(UCLASS_CPU, &cpu);
22 if (ret) {
23 debug("%s: No CPU found (err = %d)\n", __func__, ret);
24 return ret;
25 }
26
27 while (cpu) {
28 ret = uclass_next_device(&cpu);
29 if (ret) {
30 debug("%s: Error while probing CPU (err = %d)\n",
31 __func__, ret);
32 return ret;
33 }
34 }
35
36 return 0;
37 }
38
cpu_is_current(struct udevice * cpu)39 int cpu_is_current(struct udevice *cpu)
40 {
41 struct cpu_ops *ops = cpu_get_ops(cpu);
42
43 if (ops->is_current) {
44 if (ops->is_current(cpu))
45 return 1;
46 }
47
48 return -ENOSYS;
49 }
50
cpu_get_current_dev(void)51 struct udevice *cpu_get_current_dev(void)
52 {
53 struct udevice *cpu;
54 int ret;
55
56 uclass_foreach_dev_probe(UCLASS_CPU, cpu) {
57 if (cpu_is_current(cpu) > 0)
58 return cpu;
59 }
60
61 /* If can't find current cpu device, use the first dev instead */
62 ret = uclass_first_device_err(UCLASS_CPU, &cpu);
63 if (ret) {
64 debug("%s: Could not get CPU device (err = %d)\n",
65 __func__, ret);
66 return NULL;
67 }
68
69 return cpu;
70 }
71
cpu_get_desc(const struct udevice * dev,char * buf,int size)72 int cpu_get_desc(const struct udevice *dev, char *buf, int size)
73 {
74 struct cpu_ops *ops = cpu_get_ops(dev);
75
76 if (!ops->get_desc)
77 return -ENOSYS;
78
79 return ops->get_desc(dev, buf, size);
80 }
81
cpu_get_info(const struct udevice * dev,struct cpu_info * info)82 int cpu_get_info(const struct udevice *dev, struct cpu_info *info)
83 {
84 struct cpu_ops *ops = cpu_get_ops(dev);
85
86 if (!ops->get_info)
87 return -ENOSYS;
88
89 /* Init cpu_info to 0 */
90 memset(info, 0, sizeof(struct cpu_info));
91
92 return ops->get_info(dev, info);
93 }
94
cpu_get_count(const struct udevice * dev)95 int cpu_get_count(const struct udevice *dev)
96 {
97 struct cpu_ops *ops = cpu_get_ops(dev);
98
99 if (!ops->get_count)
100 return -ENOSYS;
101
102 return ops->get_count(dev);
103 }
104
cpu_get_vendor(const struct udevice * dev,char * buf,int size)105 int cpu_get_vendor(const struct udevice *dev, char *buf, int size)
106 {
107 struct cpu_ops *ops = cpu_get_ops(dev);
108
109 if (!ops->get_vendor)
110 return -ENOSYS;
111
112 return ops->get_vendor(dev, buf, size);
113 }
114
115 U_BOOT_DRIVER(cpu_bus) = {
116 .name = "cpu_bus",
117 .id = UCLASS_SIMPLE_BUS,
118 .per_child_plat_auto = sizeof(struct cpu_plat),
119 };
120
uclass_cpu_init(struct uclass * uc)121 static int uclass_cpu_init(struct uclass *uc)
122 {
123 struct udevice *dev;
124 ofnode node;
125 int ret;
126
127 node = ofnode_path("/cpus");
128 if (!ofnode_valid(node))
129 return 0;
130
131 ret = device_bind_driver_to_node(dm_root(), "cpu_bus", "cpus", node,
132 &dev);
133
134 return ret;
135 }
136
137 UCLASS_DRIVER(cpu) = {
138 .id = UCLASS_CPU,
139 .name = "cpu",
140 .flags = DM_UC_FLAG_SEQ_ALIAS,
141 .init = uclass_cpu_init,
142 };
143