initial_commit

1 files changed, 91 insertions, 0 deletions

diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h
new file mode 100644
index 00000000..7544ce6b
--- /dev/null
+++ b/arch/arm/include/asm/pmu.h
@@ -0,0 +1,91 @@
+/*
+ *  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 device);
+
+/**
+ * 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(struct platform_device *pdev);
+
+/**
+ * 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 device);
+
+#else /* CONFIG_CPU_HAS_PMU */
+
+#include <linux/err.h>
+
+static inline struct platform_device *
+reserve_pmu(enum arm_pmu_type device)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline int
+release_pmu(struct platform_device *pdev)
+{
+	return -ENODEV;
+}
+
+static inline int
+init_pmu(enum arm_pmu_type device)
+{
+	return -ENODEV;
+}
+
+#endif /* CONFIG_CPU_HAS_PMU */
+
+#endif /* __ARM_PMU_H__ */