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 <common.h>
10 #include <cpu.h>
11 #include <dm.h>
12 #include <errno.h>
13 #include <log.h>
14 #include <dm/lists.h>
15 #include <dm/root.h>
16 #include <linux/err.h>
17
cpu_probe_all(void)18 int cpu_probe_all(void)
19 {
20 struct udevice *cpu;
21 int ret;
22
23 ret = uclass_first_device(UCLASS_CPU, &cpu);
24 if (ret) {
25 debug("%s: No CPU found (err = %d)\n", __func__, ret);
26 return ret;
27 }
28
29 while (cpu) {
30 ret = uclass_next_device(&cpu);
31 if (ret) {
32 debug("%s: Error while probing CPU (err = %d)\n",
33 __func__, ret);
34 return ret;
35 }
36 }
37
38 return 0;
39 }
40
cpu_is_current(struct udevice * cpu)41 int cpu_is_current(struct udevice *cpu)
42 {
43 struct cpu_ops *ops = cpu_get_ops(cpu);
44
45 if (ops->is_current) {
46 if (ops->is_current(cpu))
47 return 1;
48 }
49
50 return -ENOSYS;
51 }
52
cpu_get_current_dev(void)53 struct udevice *cpu_get_current_dev(void)
54 {
55 struct udevice *cpu;
56 int ret;
57
58 uclass_foreach_dev_probe(UCLASS_CPU, cpu) {
59 if (cpu_is_current(cpu) > 0)
60 return cpu;
61 }
62
63 /* If can't find current cpu device, use the first dev instead */
64 ret = uclass_first_device_err(UCLASS_CPU, &cpu);
65 if (ret) {
66 debug("%s: Could not get CPU device (err = %d)\n",
67 __func__, ret);
68 return NULL;
69 }
70
71 return cpu;
72 }
73
cpu_get_desc(const struct udevice * dev,char * buf,int size)74 int cpu_get_desc(const struct udevice *dev, char *buf, int size)
75 {
76 struct cpu_ops *ops = cpu_get_ops(dev);
77
78 if (!ops->get_desc)
79 return -ENOSYS;
80
81 return ops->get_desc(dev, buf, size);
82 }
83
cpu_get_info(const struct udevice * dev,struct cpu_info * info)84 int cpu_get_info(const struct udevice *dev, struct cpu_info *info)
85 {
86 struct cpu_ops *ops = cpu_get_ops(dev);
87
88 if (!ops->get_info)
89 return -ENOSYS;
90
91 /* Init cpu_info to 0 */
92 memset(info, 0, sizeof(struct cpu_info));
93
94 return ops->get_info(dev, info);
95 }
96
cpu_get_count(const struct udevice * dev)97 int cpu_get_count(const struct udevice *dev)
98 {
99 struct cpu_ops *ops = cpu_get_ops(dev);
100
101 if (!ops->get_count)
102 return -ENOSYS;
103
104 return ops->get_count(dev);
105 }
106
cpu_get_vendor(const struct udevice * dev,char * buf,int size)107 int cpu_get_vendor(const struct udevice *dev, char *buf, int size)
108 {
109 struct cpu_ops *ops = cpu_get_ops(dev);
110
111 if (!ops->get_vendor)
112 return -ENOSYS;
113
114 return ops->get_vendor(dev, buf, size);
115 }
116
117 U_BOOT_DRIVER(cpu_bus) = {
118 .name = "cpu_bus",
119 .id = UCLASS_SIMPLE_BUS,
120 .per_child_plat_auto = sizeof(struct cpu_plat),
121 };
122
uclass_cpu_init(struct uclass * uc)123 static 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
139 UCLASS_DRIVER(cpu) = {
140 .id = UCLASS_CPU,
141 .name = "cpu",
142 .flags = DM_UC_FLAG_SEQ_ALIAS,
143 .init = uclass_cpu_init,
144 };
145