1/*
 2 *  linux/arch/arm/kernel/pmu.c
 3 *
 4 *  Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
 5 *  Copyright (C) 2010 ARM Ltd, Will Deacon
 6 *
 7 * This program is free software; you can redistribute it and/or modify
 8 * it under the terms of the GNU General Public License version 2 as
 9 * published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/err.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16
17#include <asm/pmu.h>
18
19/*
20 * PMU locking to ensure mutual exclusion between different subsystems.
21 */
22static unsigned long pmu_lock[BITS_TO_LONGS(ARM_NUM_PMU_DEVICES)];
23
24int
25reserve_pmu(enum arm_pmu_type type)
26{
27	return test_and_set_bit_lock(type, pmu_lock) ? -EBUSY : 0;
28}
29EXPORT_SYMBOL_GPL(reserve_pmu);
30
31void
32release_pmu(enum arm_pmu_type type)
33{
34	clear_bit_unlock(type, pmu_lock);
35}
36EXPORT_SYMBOL_GPL(release_pmu);