first commit

1 files changed, 202 insertions, 0 deletions

diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h
new file mode 100644
index 000000000..ae1193bcf
--- /dev/null
+++ b/include/linux/clockchips.h
@@ -0,0 +1,202 @@
+/*  linux/include/linux/clockchips.h
+ *
+ *  This file contains the structure definitions for clockchips.
+ *
+ *  If you are not a clockchip, or the time of day code, you should
+ *  not be including this file!
+ */
+#ifndef _LINUX_CLOCKCHIPS_H
+#define _LINUX_CLOCKCHIPS_H
+
+/* Clock event notification values */
+enum clock_event_nofitiers {
+	CLOCK_EVT_NOTIFY_ADD,
+	CLOCK_EVT_NOTIFY_BROADCAST_ON,
+	CLOCK_EVT_NOTIFY_BROADCAST_OFF,
+	CLOCK_EVT_NOTIFY_BROADCAST_FORCE,
+	CLOCK_EVT_NOTIFY_BROADCAST_ENTER,
+	CLOCK_EVT_NOTIFY_BROADCAST_EXIT,
+	CLOCK_EVT_NOTIFY_SUSPEND,
+	CLOCK_EVT_NOTIFY_RESUME,
+	CLOCK_EVT_NOTIFY_CPU_DYING,
+	CLOCK_EVT_NOTIFY_CPU_DEAD,
+};
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
+
+#include <linux/clocksource.h>
+#include <linux/cpumask.h>
+#include <linux/ktime.h>
+#include <linux/notifier.h>
+
+struct clock_event_device;
+struct module;
+
+/* Clock event mode commands */
+enum clock_event_mode {
+	CLOCK_EVT_MODE_UNUSED = 0,
+	CLOCK_EVT_MODE_SHUTDOWN,
+	CLOCK_EVT_MODE_PERIODIC,
+	CLOCK_EVT_MODE_ONESHOT,
+	CLOCK_EVT_MODE_RESUME,
+};
+
+/*
+ * Clock event features
+ */
+#define CLOCK_EVT_FEAT_PERIODIC		0x000001
+#define CLOCK_EVT_FEAT_ONESHOT		0x000002
+#define CLOCK_EVT_FEAT_KTIME		0x000004
+/*
+ * x86(64) specific misfeatures:
+ *
+ * - Clockevent source stops in C3 State and needs broadcast support.
+ * - Local APIC timer is used as a dummy device.
+ */
+#define CLOCK_EVT_FEAT_C3STOP		0x000008
+#define CLOCK_EVT_FEAT_DUMMY		0x000010
+
+/*
+ * Core shall set the interrupt affinity dynamically in broadcast mode
+ */
+#define CLOCK_EVT_FEAT_DYNIRQ		0x000020
+
+/**
+ * struct clock_event_device - clock event device descriptor
+ * @event_handler:	Assigned by the framework to be called by the low
+ *			level handler of the event source
+ * @set_next_event:	set next event function using a clocksource delta
+ * @set_next_ktime:	set next event function using a direct ktime value
+ * @next_event:		local storage for the next event in oneshot mode
+ * @max_delta_ns:	maximum delta value in ns
+ * @min_delta_ns:	minimum delta value in ns
+ * @mult:		nanosecond to cycles multiplier
+ * @shift:		nanoseconds to cycles divisor (power of two)
+ * @mode:		operating mode assigned by the management code
+ * @features:		features
+ * @retries:		number of forced programming retries
+ * @set_mode:		set mode function
+ * @broadcast:		function to broadcast events
+ * @min_delta_ticks:	minimum delta value in ticks stored for reconfiguration
+ * @max_delta_ticks:	maximum delta value in ticks stored for reconfiguration
+ * @name:		ptr to clock event name
+ * @rating:		variable to rate clock event devices
+ * @irq:		IRQ number (only for non CPU local devices)
+ * @cpumask:		cpumask to indicate for which CPUs this device works
+ * @list:		list head for the management code
+ * @owner:		module reference
+ */
+struct clock_event_device {
+	void			(*event_handler)(struct clock_event_device *);
+	int			(*set_next_event)(unsigned long evt,
+						  struct clock_event_device *);
+	int			(*set_next_ktime)(ktime_t expires,
+						  struct clock_event_device *);
+	ktime_t			next_event;
+	u64			max_delta_ns;
+	u64			min_delta_ns;
+	u32			mult;
+	u32			shift;
+	enum clock_event_mode	mode;
+	unsigned int		features;
+	unsigned long		retries;
+
+	void			(*broadcast)(const struct cpumask *mask);
+	void			(*set_mode)(enum clock_event_mode mode,
+					    struct clock_event_device *);
+	void			(*suspend)(struct clock_event_device *);
+	void			(*resume)(struct clock_event_device *);
+	unsigned long		min_delta_ticks;
+	unsigned long		max_delta_ticks;
+
+	const char		*name;
+	int			rating;
+	int			irq;
+	const struct cpumask	*cpumask;
+	struct list_head	list;
+	struct module		*owner;
+} ____cacheline_aligned;
+
+/*
+ * Calculate a multiplication factor for scaled math, which is used to convert
+ * nanoseconds based values to clock ticks:
+ *
+ * clock_ticks = (nanoseconds * factor) >> shift.
+ *
+ * div_sc is the rearranged equation to calculate a factor from a given clock
+ * ticks / nanoseconds ratio:
+ *
+ * factor = (clock_ticks << shift) / nanoseconds
+ */
+static inline unsigned long div_sc(unsigned long ticks, unsigned long nsec,
+				   int shift)
+{
+	uint64_t tmp = ((uint64_t)ticks) << shift;
+
+	do_div(tmp, nsec);
+	return (unsigned long) tmp;
+}
+
+/* Clock event layer functions */
+extern u64 clockevent_delta2ns(unsigned long latch,
+			       struct clock_event_device *evt);
+extern void clockevents_register_device(struct clock_event_device *dev);
+
+extern void clockevents_config(struct clock_event_device *dev, u32 freq);
+extern void clockevents_config_and_register(struct clock_event_device *dev,
+					    u32 freq, unsigned long min_delta,
+					    unsigned long max_delta);
+
+extern int clockevents_update_freq(struct clock_event_device *ce, u32 freq);
+
+extern void clockevents_exchange_device(struct clock_event_device *old,
+					struct clock_event_device *new);
+extern void clockevents_set_mode(struct clock_event_device *dev,
+				 enum clock_event_mode mode);
+extern int clockevents_program_event(struct clock_event_device *dev,
+				     ktime_t expires, bool force);
+
+extern void clockevents_handle_noop(struct clock_event_device *dev);
+
+static inline void
+clockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 minsec)
+{
+	return clocks_calc_mult_shift(&ce->mult, &ce->shift, NSEC_PER_SEC,
+				      freq, minsec);
+}
+
+extern void clockevents_suspend(void);
+extern void clockevents_resume(void);
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+#ifdef CONFIG_ARCH_HAS_TICK_BROADCAST
+extern void tick_broadcast(const struct cpumask *mask);
+#else
+#define tick_broadcast	NULL
+#endif
+extern int tick_receive_broadcast(void);
+#endif
+
+#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
+extern int tick_check_broadcast_expired(void);
+#else
+static inline int tick_check_broadcast_expired(void) { return 0; }
+#endif
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+extern void clockevents_notify(unsigned long reason, void *arg);
+#else
+static inline void clockevents_notify(unsigned long reason, void *arg) {}
+#endif
+
+#else /* CONFIG_GENERIC_CLOCKEVENTS_BUILD */
+
+static inline void clockevents_suspend(void) {}
+static inline void clockevents_resume(void) {}
+
+static inline void clockevents_notify(unsigned long reason, void *arg) {}
+static inline int tick_check_broadcast_expired(void) { return 0; }
+
+#endif
+
+#endif