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/*
* linux/arch/arm/include/asm/pmu.h
*
* Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#ifndef __ARM_PMU_H__
#define __ARM_PMU_H__
#include <linux/interrupt.h>
enum arm_pmu_type {
ARM_PMU_DEVICE_CPU = 0,
ARM_NUM_PMU_DEVICES,
};
/*
* struct arm_pmu_platdata - ARM PMU platform data
*
* @handle_irq: an optional handler which will be called from the interrupt and
* passed the address of the low level handler, and can be used to implement
* any platform specific handling before or after calling it.
*/
struct arm_pmu_platdata {
irqreturn_t (*handle_irq)(int irq, void *dev,
irq_handler_t pmu_handler);
};
#ifdef CONFIG_CPU_HAS_PMU
/**
* reserve_pmu() - reserve the hardware performance counters
*
* Reserve the hardware performance counters in the system for exclusive use.
* The platform_device for the system is returned on success, ERR_PTR()
* encoded error on failure.
*/
extern struct platform_device *
reserve_pmu(enum arm_pmu_type type);
/**
* release_pmu() - Relinquish control of the performance counters
*
* Release the performance counters and allow someone else to use them.
* Callers must have disabled the counters and released IRQs before calling
* this. The platform_device returned from reserve_pmu() must be passed as
* a cookie.
*/
extern int
release_pmu(enum arm_pmu_type type);
/**
* init_pmu() - Initialise the PMU.
*
* Initialise the system ready for PMU enabling. This should typically set the
* IRQ affinity and nothing else. The users (oprofile/perf events etc) will do
* the actual hardware initialisation.
*/
extern int
init_pmu(enum arm_pmu_type type);
#else /* CONFIG_CPU_HAS_PMU */
#include <linux/err.h>
static inline struct platform_device *
reserve_pmu(enum arm_pmu_type type)
{
return ERR_PTR(-ENODEV);
}
static inline int
release_pmu(enum arm_pmu_type type)
{
return -ENODEV;
}
static inline int
init_pmu(enum arm_pmu_type type)
{
return -ENODEV;
}
#endif /* CONFIG_CPU_HAS_PMU */
#endif /* __ARM_PMU_H__ */
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