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/**
23 * struct cpu_operations - Callback operations for hotplugging CPUs.
24 *
25 * @name:	Name of the property as appears in a devicetree cpu node's
26 *		enable-method property. On systems booting with ACPI, @name
27 *		identifies the struct cpu_operations entry corresponding to
28 *		the boot protocol specified in the ACPI MADT table.
29 * @cpu_init:	Reads any data necessary for a specific enable-method for a
30 *		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_init_idle: Reads any data necessary to initialize CPU idle states for
44 *		   a proposed logical id.
45 * @cpu_suspend: Suspends a cpu and saves the required context. May fail owing
46 *               to wrong parameters or error conditions. Called from the
47 *               CPU being suspended. Must be called with IRQs disabled.
48 */
49struct cpu_operations {
50	const char	*name;
51	int		(*cpu_init)(unsigned int);
52	int		(*cpu_prepare)(unsigned int);
53	int		(*cpu_boot)(unsigned int);
54	void		(*cpu_postboot)(void);
55#ifdef CONFIG_HOTPLUG_CPU
56	int		(*cpu_disable)(unsigned int cpu);
57	void		(*cpu_die)(unsigned int cpu);
58	int		(*cpu_kill)(unsigned int cpu);
59#endif
60#ifdef CONFIG_CPU_IDLE
61	int		(*cpu_init_idle)(unsigned int);
62	int		(*cpu_suspend)(unsigned long);
63#endif
64};
65
66extern const struct cpu_operations *cpu_ops[NR_CPUS];
67int __init cpu_read_ops(int cpu);
68
69static inline void __init cpu_read_bootcpu_ops(void)
70{
71	cpu_read_ops(0);
72}
73
74#endif /* ifndef __ASM_CPU_OPS_H */
75