#include <linux/timex.h>
#include <linux/time.h>
#include <linux/list.h>
+#include <linux/timer.h>
#include <asm/div64.h>
#include <asm/io.h>
/* clocksource cycle base type */
typedef u64 cycle_t;
+struct clocksource;
/**
* struct clocksource - hardware abstraction for a free running counter
* subtraction of non 64 bit counters
* @mult: cycle to nanosecond multiplier
* @shift: cycle to nanosecond divisor (power of two)
- * @update_callback: called when safe to alter clocksource values
- * @is_continuous: defines if clocksource is free-running.
- * @interval_cycles: Used internally by timekeeping core, please ignore.
- * @interval_snsecs: Used internally by timekeeping core, please ignore.
+ * @flags: flags describing special properties
+ * @vread: vsyscall based read
+ * @cycle_interval: Used internally by timekeeping core, please ignore.
+ * @xtime_interval: Used internally by timekeeping core, please ignore.
*/
struct clocksource {
char *name;
cycle_t mask;
u32 mult;
u32 shift;
- int (*update_callback)(void);
- int is_continuous;
+ unsigned long flags;
+ cycle_t (*vread)(void);
/* timekeeping specific data, ignore */
- cycle_t interval_cycles;
- u64 interval_snsecs;
+ cycle_t cycle_last, cycle_interval;
+ u64 xtime_nsec, xtime_interval;
+ s64 error;
+
+#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
+ /* Watchdog related data, used by the framework */
+ struct list_head wd_list;
+ cycle_t wd_last;
+#endif
};
+/*
+ * Clock source flags bits::
+ */
+#define CLOCK_SOURCE_IS_CONTINUOUS 0x01
+#define CLOCK_SOURCE_MUST_VERIFY 0x02
+
+#define CLOCK_SOURCE_WATCHDOG 0x10
+#define CLOCK_SOURCE_VALID_FOR_HRES 0x20
+
+/* simplify initialization of mask field */
+#define CLOCKSOURCE_MASK(bits) (cycle_t)(bits<64 ? ((1ULL<<bits)-1) : -1)
/**
* clocksource_khz2mult - calculates mult from khz and shift
}
/**
- * read_clocksource: - Access the clocksource's current cycle value
+ * clocksource_read: - Access the clocksource's current cycle value
* @cs: pointer to clocksource being read
*
* Uses the clocksource to return the current cycle_t value
*/
-static inline cycle_t read_clocksource(struct clocksource *cs)
+static inline cycle_t clocksource_read(struct clocksource *cs)
{
return cs->read();
}
}
/**
- * calculate_clocksource_interval - Calculates a clocksource interval struct
+ * clocksource_calculate_interval - Calculates a clocksource interval struct
*
* @c: Pointer to clocksource.
* @length_nsec: Desired interval length in nanoseconds.
*
* Unless you're the timekeeping code, you should not be using this!
*/
-static inline void calculate_clocksource_interval(struct clocksource *c,
- unsigned long length_nsec)
+static inline void clocksource_calculate_interval(struct clocksource *c,
+ unsigned long length_nsec)
{
u64 tmp;
tmp += c->mult/2;
do_div(tmp, c->mult);
- c->interval_cycles = (cycle_t)tmp;
- if(c->interval_cycles == 0)
- c->interval_cycles = 1;
+ c->cycle_interval = (cycle_t)tmp;
+ if (c->cycle_interval == 0)
+ c->cycle_interval = 1;
- c->interval_snsecs = (u64)c->interval_cycles * c->mult;
+ c->xtime_interval = (u64)c->cycle_interval * c->mult;
}
+
/* used to install a new clocksource */
-int register_clocksource(struct clocksource*);
-void reselect_clocksource(void);
-struct clocksource* get_next_clocksource(void);
+extern int clocksource_register(struct clocksource*);
+extern struct clocksource* clocksource_get_next(void);
+extern void clocksource_change_rating(struct clocksource *cs, int rating);
+
+#ifdef CONFIG_GENERIC_TIME_VSYSCALL
+extern void update_vsyscall(struct timespec *ts, struct clocksource *c);
+#else
+static inline void update_vsyscall(struct timespec *ts, struct clocksource *c)
+{
+}
+#endif
#endif /* _LINUX_CLOCKSOURCE_H */