Commit | Line | Data |
---|---|---|
d64f84f6 LP |
1 | /* |
2 | * ARM64 CPU idle arch support | |
3 | * | |
4 | * Copyright (C) 2014 ARM Ltd. | |
5 | * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
5a611ed9 SH |
12 | #include <linux/acpi.h> |
13 | #include <linux/cpuidle.h> | |
14 | #include <linux/cpu_pm.h> | |
d64f84f6 LP |
15 | #include <linux/of.h> |
16 | #include <linux/of_device.h> | |
17 | ||
18 | #include <asm/cpuidle.h> | |
19 | #include <asm/cpu_ops.h> | |
20 | ||
ce3ad710 | 21 | int arm_cpuidle_init(unsigned int cpu) |
d64f84f6 LP |
22 | { |
23 | int ret = -EOPNOTSUPP; | |
d64f84f6 | 24 | |
b5fda7ed JZ |
25 | if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_suspend && |
26 | cpu_ops[cpu]->cpu_init_idle) | |
819a8826 | 27 | ret = cpu_ops[cpu]->cpu_init_idle(cpu); |
d64f84f6 | 28 | |
d64f84f6 LP |
29 | return ret; |
30 | } | |
af3cfdbf LP |
31 | |
32 | /** | |
33 | * cpu_suspend() - function to enter a low-power idle state | |
34 | * @arg: argument to pass to CPU suspend operations | |
35 | * | |
36 | * Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU | |
37 | * operations back-end error code otherwise. | |
38 | */ | |
af391b15 | 39 | int arm_cpuidle_suspend(int index) |
af3cfdbf LP |
40 | { |
41 | int cpu = smp_processor_id(); | |
42 | ||
af391b15 | 43 | return cpu_ops[cpu]->cpu_suspend(index); |
af3cfdbf | 44 | } |
5a611ed9 SH |
45 | |
46 | #ifdef CONFIG_ACPI | |
47 | ||
48 | #include <acpi/processor.h> | |
49 | ||
50 | int acpi_processor_ffh_lpi_probe(unsigned int cpu) | |
51 | { | |
52 | return arm_cpuidle_init(cpu); | |
53 | } | |
54 | ||
55 | int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi) | |
56 | { | |
57 | return CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, lpi->index); | |
58 | } | |
59 | #endif |