ARM: 6765/1: remove obsolete comment from asm/mach/arch.h
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / arm / include / asm / pmu.h
blob8ccea012722cb78686287acc7566be31aa295403
1 /*
2 * linux/arch/arm/include/asm/pmu.h
4 * Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
12 #ifndef __ARM_PMU_H__
13 #define __ARM_PMU_H__
15 enum arm_pmu_type {
16 ARM_PMU_DEVICE_CPU = 0,
17 ARM_NUM_PMU_DEVICES,
20 #ifdef CONFIG_CPU_HAS_PMU
22 /**
23 * reserve_pmu() - reserve the hardware performance counters
25 * Reserve the hardware performance counters in the system for exclusive use.
26 * The platform_device for the system is returned on success, ERR_PTR()
27 * encoded error on failure.
29 extern struct platform_device *
30 reserve_pmu(enum arm_pmu_type device);
32 /**
33 * release_pmu() - Relinquish control of the performance counters
35 * Release the performance counters and allow someone else to use them.
36 * Callers must have disabled the counters and released IRQs before calling
37 * this. The platform_device returned from reserve_pmu() must be passed as
38 * a cookie.
40 extern int
41 release_pmu(struct platform_device *pdev);
43 /**
44 * init_pmu() - Initialise the PMU.
46 * Initialise the system ready for PMU enabling. This should typically set the
47 * IRQ affinity and nothing else. The users (oprofile/perf events etc) will do
48 * the actual hardware initialisation.
50 extern int
51 init_pmu(enum arm_pmu_type device);
53 #else /* CONFIG_CPU_HAS_PMU */
55 #include <linux/err.h>
57 static inline struct platform_device *
58 reserve_pmu(enum arm_pmu_type device)
60 return ERR_PTR(-ENODEV);
63 static inline int
64 release_pmu(struct platform_device *pdev)
66 return -ENODEV;
69 static inline int
70 init_pmu(enum arm_pmu_type device)
72 return -ENODEV;
75 #endif /* CONFIG_CPU_HAS_PMU */
77 #endif /* __ARM_PMU_H__ */