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
8 extern int arm_cpuidle_init(unsigned int cpu);
9 extern int arm_cpuidle_suspend(int index);
10 #else
arm_cpuidle_init(unsigned int cpu)11 static inline int arm_cpuidle_init(unsigned int cpu)
12 {
13 	return -EOPNOTSUPP;
14 }
15 
arm_cpuidle_suspend(int index)16 static 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 
25 struct 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
51 struct 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
57