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1 | /* |
2 | * Copyright (C) 2013 ARM Ltd. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | #ifndef __ASM_CPU_OPS_H | |
17 | #define __ASM_CPU_OPS_H | |
18 | ||
19 | #include <linux/init.h> | |
20 | #include <linux/threads.h> | |
21 | ||
22 | struct device_node; | |
23 | ||
24 | /** | |
25 | * struct cpu_operations - Callback operations for hotplugging CPUs. | |
26 | * | |
27 | * @name: Name of the property as appears in a devicetree cpu node's | |
28 | * enable-method property. | |
29 | * @cpu_init: Reads any data necessary for a specific enable-method from the | |
30 | * devicetree, for a given cpu node and proposed logical id. | |
31 | * @cpu_prepare: Early one-time preparation step for a cpu. If there is a | |
32 | * mechanism for doing so, tests whether it is possible to boot | |
33 | * the given CPU. | |
34 | * @cpu_boot: Boots a cpu into the kernel. | |
35 | * @cpu_postboot: Optionally, perform any post-boot cleanup or necesary | |
36 | * synchronisation. Called from the cpu being booted. | |
37 | * @cpu_disable: Prepares a cpu to die. May fail for some mechanism-specific | |
38 | * reason, which will cause the hot unplug to be aborted. Called | |
39 | * from the cpu to be killed. | |
40 | * @cpu_die: Makes a cpu leave the kernel. Must not fail. Called from the | |
41 | * cpu being killed. | |
42 | * @cpu_kill: Ensures a cpu has left the kernel. Called from another cpu. | |
43 | * @cpu_suspend: Suspends a cpu and saves the required context. May fail owing | |
44 | * to wrong parameters or error conditions. Called from the | |
45 | * CPU being suspended. Must be called with IRQs disabled. | |
46 | */ | |
47 | struct cpu_operations { | |
48 | const char *name; | |
49 | int (*cpu_init)(struct device_node *, unsigned int); | |
50 | int (*cpu_prepare)(unsigned int); | |
51 | int (*cpu_boot)(unsigned int); | |
52 | void (*cpu_postboot)(void); | |
53 | #ifdef CONFIG_HOTPLUG_CPU | |
54 | int (*cpu_disable)(unsigned int cpu); | |
55 | void (*cpu_die)(unsigned int cpu); | |
56 | int (*cpu_kill)(unsigned int cpu); | |
57 | #endif | |
58 | #ifdef CONFIG_ARM64_CPU_SUSPEND | |
59 | int (*cpu_suspend)(unsigned long); | |
60 | #endif | |
61 | }; | |
62 | ||
63 | extern const struct cpu_operations *cpu_ops[NR_CPUS]; | |
64 | extern int __init cpu_read_ops(struct device_node *dn, int cpu); | |
65 | extern void __init cpu_read_bootcpu_ops(void); | |
66 | ||
67 | #endif /* ifndef __ASM_CPU_OPS_H */ |