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MIPS: cpuidle wait instruction state

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Defines a macro intended to allow trivial use of the regular MIPS wait
instruction from cpuidle drivers, which may simply invoke the macro
within their array of states.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
This commit is contained in:
Paul Burton 2014-04-14 16:16:41 +01:00
parent 0155a06529
commit da9f970fdd
2 changed files with 25 additions and 0 deletions
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14
arch/mips/include/asm/idle.h
View file

@ -1,6 +1,7 @@
#ifndef __ASM_IDLE_H
#define __ASM_IDLE_H
#include <linux/cpuidle.h>
#include <linux/linkage.h>
extern void (*cpu_wait)(void);
@ -20,4 +21,17 @@ static inline int address_is_in_r4k_wait_irqoff(unsigned long addr)
addr < (unsigned long)__pastwait;
}
extern int mips_cpuidle_wait_enter(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index);
#define MIPS_CPUIDLE_WAIT_STATE {\
.enter = mips_cpuidle_wait_enter,\
.exit_latency = 1,\
.target_residency = 1,\
.power_usage = UINT_MAX,\
.flags = CPUIDLE_FLAG_TIME_VALID,\
.name = "wait",\
.desc = "MIPS wait",\
}
#endif /* __ASM_IDLE_H */

11
arch/mips/kernel/idle.c
View file

@ -250,3 +250,14 @@ void arch_cpu_idle(void)
else
local_irq_enable();
}
#ifdef CONFIG_CPU_IDLE
int mips_cpuidle_wait_enter(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
arch_cpu_idle();
return index;
}
#endif