Initial import

1 files changed, 245 insertions, 0 deletions

diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
new file mode 100644
index 000000000..9c5e89254
--- /dev/null
+++ b/include/linux/cpuidle.h
@@ -0,0 +1,245 @@
+/*
+ * cpuidle.h - a generic framework for CPU idle power management
+ *
+ * (C) 2007 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+ *          Shaohua Li <shaohua.li@intel.com>
+ *          Adam Belay <abelay@novell.com>
+ *
+ * This code is licenced under the GPL.
+ */
+
+#ifndef _LINUX_CPUIDLE_H
+#define _LINUX_CPUIDLE_H
+
+#include <linux/percpu.h>
+#include <linux/list.h>
+#include <linux/hrtimer.h>
+
+#define CPUIDLE_STATE_MAX	10
+#define CPUIDLE_NAME_LEN	16
+#define CPUIDLE_DESC_LEN	32
+
+struct module;
+
+struct cpuidle_device;
+struct cpuidle_driver;
+
+
+/****************************
+ * CPUIDLE DEVICE INTERFACE *
+ ****************************/
+
+struct cpuidle_state_usage {
+	unsigned long long	disable;
+	unsigned long long	usage;
+	unsigned long long	time; /* in US */
+};
+
+struct cpuidle_state {
+	char		name[CPUIDLE_NAME_LEN];
+	char		desc[CPUIDLE_DESC_LEN];
+
+	unsigned int	flags;
+	unsigned int	exit_latency; /* in US */
+	int		power_usage; /* in mW */
+	unsigned int	target_residency; /* in US */
+	bool		disabled; /* disabled on all CPUs */
+
+	int (*enter)	(struct cpuidle_device *dev,
+			struct cpuidle_driver *drv,
+			int index);
+
+	int (*enter_dead) (struct cpuidle_device *dev, int index);
+
+	/*
+	 * CPUs execute ->enter_freeze with the local tick or entire timekeeping
+	 * suspended, so it must not re-enable interrupts at any point (even
+	 * temporarily) or attempt to change states of clock event devices.
+	 */
+	void (*enter_freeze) (struct cpuidle_device *dev,
+			      struct cpuidle_driver *drv,
+			      int index);
+};
+
+/* Idle State Flags */
+#define CPUIDLE_FLAG_COUPLED	(0x02) /* state applies to multiple cpus */
+#define CPUIDLE_FLAG_TIMER_STOP (0x04)  /* timer is stopped on this state */
+
+#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)
+
+struct cpuidle_device_kobj;
+struct cpuidle_state_kobj;
+struct cpuidle_driver_kobj;
+
+struct cpuidle_device {
+	unsigned int		registered:1;
+	unsigned int		enabled:1;
+	unsigned int		cpu;
+
+	int			last_residency;
+	struct cpuidle_state_usage	states_usage[CPUIDLE_STATE_MAX];
+	struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];
+	struct cpuidle_driver_kobj *kobj_driver;
+	struct cpuidle_device_kobj *kobj_dev;
+	struct list_head 	device_list;
+
+#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
+	int			safe_state_index;
+	cpumask_t		coupled_cpus;
+	struct cpuidle_coupled	*coupled;
+#endif
+};
+
+DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices);
+DECLARE_PER_CPU(struct cpuidle_device, cpuidle_dev);
+
+/**
+ * cpuidle_get_last_residency - retrieves the last state's residency time
+ * @dev: the target CPU
+ */
+static inline int cpuidle_get_last_residency(struct cpuidle_device *dev)
+{
+	return dev->last_residency;
+}
+
+
+/****************************
+ * CPUIDLE DRIVER INTERFACE *
+ ****************************/
+
+struct cpuidle_driver {
+	const char		*name;
+	struct module 		*owner;
+	int                     refcnt;
+
+        /* used by the cpuidle framework to setup the broadcast timer */
+	unsigned int            bctimer:1;
+	/* states array must be ordered in decreasing power consumption */
+	struct cpuidle_state	states[CPUIDLE_STATE_MAX];
+	int			state_count;
+	int			safe_state_index;
+
+	/* the driver handles the cpus in cpumask */
+	struct cpumask		*cpumask;
+};
+
+#ifdef CONFIG_CPU_IDLE
+extern void disable_cpuidle(void);
+extern bool cpuidle_not_available(struct cpuidle_driver *drv,
+				  struct cpuidle_device *dev);
+
+extern int cpuidle_select(struct cpuidle_driver *drv,
+			  struct cpuidle_device *dev);
+extern int cpuidle_enter(struct cpuidle_driver *drv,
+			 struct cpuidle_device *dev, int index);
+extern void cpuidle_reflect(struct cpuidle_device *dev, int index);
+
+extern int cpuidle_register_driver(struct cpuidle_driver *drv);
+extern struct cpuidle_driver *cpuidle_get_driver(void);
+extern struct cpuidle_driver *cpuidle_driver_ref(void);
+extern void cpuidle_driver_unref(void);
+extern void cpuidle_unregister_driver(struct cpuidle_driver *drv);
+extern int cpuidle_register_device(struct cpuidle_device *dev);
+extern void cpuidle_unregister_device(struct cpuidle_device *dev);
+extern int cpuidle_register(struct cpuidle_driver *drv,
+			    const struct cpumask *const coupled_cpus);
+extern void cpuidle_unregister(struct cpuidle_driver *drv);
+extern void cpuidle_pause_and_lock(void);
+extern void cpuidle_resume_and_unlock(void);
+extern void cpuidle_pause(void);
+extern void cpuidle_resume(void);
+extern int cpuidle_enable_device(struct cpuidle_device *dev);
+extern void cpuidle_disable_device(struct cpuidle_device *dev);
+extern int cpuidle_play_dead(void);
+extern int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
+				      struct cpuidle_device *dev);
+extern int cpuidle_enter_freeze(struct cpuidle_driver *drv,
+				struct cpuidle_device *dev);
+
+extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev);
+#else
+static inline void disable_cpuidle(void) { }
+static inline bool cpuidle_not_available(struct cpuidle_driver *drv,
+					 struct cpuidle_device *dev)
+{return true; }
+static inline int cpuidle_select(struct cpuidle_driver *drv,
+				 struct cpuidle_device *dev)
+{return -ENODEV; }
+static inline int cpuidle_enter(struct cpuidle_driver *drv,
+				struct cpuidle_device *dev, int index)
+{return -ENODEV; }
+static inline void cpuidle_reflect(struct cpuidle_device *dev, int index) { }
+static inline int cpuidle_register_driver(struct cpuidle_driver *drv)
+{return -ENODEV; }
+static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; }
+static inline struct cpuidle_driver *cpuidle_driver_ref(void) {return NULL; }
+static inline void cpuidle_driver_unref(void) {}
+static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { }
+static inline int cpuidle_register_device(struct cpuidle_device *dev)
+{return -ENODEV; }
+static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { }
+static inline int cpuidle_register(struct cpuidle_driver *drv,
+				   const struct cpumask *const coupled_cpus)
+{return -ENODEV; }
+static inline void cpuidle_unregister(struct cpuidle_driver *drv) { }
+static inline void cpuidle_pause_and_lock(void) { }
+static inline void cpuidle_resume_and_unlock(void) { }
+static inline void cpuidle_pause(void) { }
+static inline void cpuidle_resume(void) { }
+static inline int cpuidle_enable_device(struct cpuidle_device *dev)
+{return -ENODEV; }
+static inline void cpuidle_disable_device(struct cpuidle_device *dev) { }
+static inline int cpuidle_play_dead(void) {return -ENODEV; }
+static inline int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
+					     struct cpuidle_device *dev)
+{return -ENODEV; }
+static inline int cpuidle_enter_freeze(struct cpuidle_driver *drv,
+				       struct cpuidle_device *dev)
+{return -ENODEV; }
+static inline struct cpuidle_driver *cpuidle_get_cpu_driver(
+	struct cpuidle_device *dev) {return NULL; }
+#endif
+
+#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
+void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a);
+#else
+static inline void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a)
+{
+}
+#endif
+
+/******************************
+ * CPUIDLE GOVERNOR INTERFACE *
+ ******************************/
+
+struct cpuidle_governor {
+	char			name[CPUIDLE_NAME_LEN];
+	struct list_head 	governor_list;
+	unsigned int		rating;
+
+	int  (*enable)		(struct cpuidle_driver *drv,
+					struct cpuidle_device *dev);
+	void (*disable)		(struct cpuidle_driver *drv,
+					struct cpuidle_device *dev);
+
+	int  (*select)		(struct cpuidle_driver *drv,
+					struct cpuidle_device *dev);
+	void (*reflect)		(struct cpuidle_device *dev, int index);
+
+	struct module 		*owner;
+};
+
+#ifdef CONFIG_CPU_IDLE
+extern int cpuidle_register_governor(struct cpuidle_governor *gov);
+#else
+static inline int cpuidle_register_governor(struct cpuidle_governor *gov)
+{return 0;}
+#endif
+
+#ifdef CONFIG_ARCH_HAS_CPU_RELAX
+#define CPUIDLE_DRIVER_STATE_START	1
+#else
+#define CPUIDLE_DRIVER_STATE_START	0
+#endif
+
+#endif /* _LINUX_CPUIDLE_H */