1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Low-level idle sequences
4 */
5
6 #include <linux/cpu.h>
7 #include <linux/irqflags.h>
8
9 #include <asm/barrier.h>
10 #include <asm/cpuidle.h>
11 #include <asm/cpufeature.h>
12 #include <asm/sysreg.h>
13
14 /*
15 * cpu_do_idle()
16 *
17 * Idle the processor (wait for interrupt).
18 *
19 * If the CPU supports priority masking we must do additional work to
20 * ensure that interrupts are not masked at the PMR (because the core will
21 * not wake up if we block the wake up signal in the interrupt controller).
22 */
23 void __cpuidle cpu_do_idle(void)
24 {
25 struct arm_cpuidle_irq_context context;
26
27 arm_cpuidle_save_irq_context(&context);
28
29 dsb(sy);
30 wfi();
31
32 arm_cpuidle_restore_irq_context(&context);
33 }
34
35 /*
36 * This is our default idle handler.
37 */
38 void __cpuidle arch_cpu_idle(void)
39 {
40 /*
41 * This should do all the clock switching and wait for interrupt
42 * tricks
43 */
44 cpu_do_idle();
45 }
46
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.