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