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Linux kernel mirror (for testing)
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kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_CPUIDLE_H
3#define __ASM_CPUIDLE_H
4
5#include <asm/proc-fns.h>
6
7#ifdef CONFIG_CPU_IDLE
8extern int arm_cpuidle_init(unsigned int cpu);
9extern int arm_cpuidle_suspend(int index);
10#else
11static inline int arm_cpuidle_init(unsigned int cpu)
12{
13 return -EOPNOTSUPP;
14}
15
16static inline int arm_cpuidle_suspend(int index)
17{
18 return -EOPNOTSUPP;
19}
20#endif
21
22#ifdef CONFIG_ARM64_PSEUDO_NMI
23#include <asm/arch_gicv3.h>
24
25struct arm_cpuidle_irq_context {
26 unsigned long pmr;
27 unsigned long daif_bits;
28};
29
30#define arm_cpuidle_save_irq_context(__c) \
31 do { \
32 struct arm_cpuidle_irq_context *c = __c; \
33 if (system_uses_irq_prio_masking()) { \
34 c->daif_bits = read_sysreg(daif); \
35 write_sysreg(c->daif_bits | PSR_I_BIT | PSR_F_BIT, \
36 daif); \
37 c->pmr = gic_read_pmr(); \
38 gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET); \
39 } \
40 } while (0)
41
42#define arm_cpuidle_restore_irq_context(__c) \
43 do { \
44 struct arm_cpuidle_irq_context *c = __c; \
45 if (system_uses_irq_prio_masking()) { \
46 gic_write_pmr(c->pmr); \
47 write_sysreg(c->daif_bits, daif); \
48 } \
49 } while (0)
50#else
51struct arm_cpuidle_irq_context { };
52
53#define arm_cpuidle_save_irq_context(c) (void)c
54#define arm_cpuidle_restore_irq_context(c) (void)c
55#endif
56#endif