arch/arm64/include/asm/cpuidle.h

   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
  11 static inline int arm_cpuidle_init(unsigned int cpu)
  12 {
  13         return -EOPNOTSUPP;
  14 }
  15
  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