* @disable: optional function to disable the clocksource
* @mask: bitmask for two's complement
* subtraction of non 64 bit counters
- * @mult: cycle to nanosecond multiplier (adjusted by NTP)
- * @mult_orig: cycle to nanosecond multiplier (unadjusted by NTP)
+ * @mult: cycle to nanosecond multiplier
* @shift: cycle to nanosecond divisor (power of two)
+ * @max_idle_ns: max idle time permitted by the clocksource (nsecs)
* @flags: flags describing special properties
* @vread: vsyscall based read
* @resume: resume function for the clocksource, if necessary
- * @cycle_interval: Used internally by timekeeping core, please ignore.
- * @xtime_interval: Used internally by timekeeping core, please ignore.
*/
struct clocksource {
/*
void (*disable)(struct clocksource *cs);
cycle_t mask;
u32 mult;
- u32 mult_orig;
u32 shift;
+ u64 max_idle_ns;
unsigned long flags;
cycle_t (*vread)(void);
void (*resume)(void);
#define CLKSRC_FSYS_MMIO_SET(mmio, addr) do { } while (0)
#endif
- /* timekeeping specific data, ignore */
- cycle_t cycle_interval;
- u64 xtime_interval;
- u32 raw_interval;
/*
* Second part is written at each timer interrupt
* Keep it in a different cache line to dirty no
* more than one cache line.
*/
cycle_t cycle_last ____cacheline_aligned_in_smp;
- u64 xtime_nsec;
- s64 error;
- struct timespec raw_time;
#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
/* Watchdog related data, used by the framework */
#endif
};
-extern struct clocksource *clock; /* current clocksource */
-
/*
* Clock source flags bits::
*/
}
/**
- * cyc2ns - converts clocksource cycles to nanoseconds
- * @cs: Pointer to clocksource
- * @cycles: Cycles
+ * clocksource_cyc2ns - converts clocksource cycles to nanoseconds
*
- * Uses the clocksource and ntp ajdustment to convert cycle_ts to nanoseconds.
+ * Converts cycles to nanoseconds, using the given mult and shift.
*
* XXX - This could use some mult_lxl_ll() asm optimization
*/
-static inline s64 cyc2ns(struct clocksource *cs, cycle_t cycles)
+static inline s64 clocksource_cyc2ns(cycle_t cycles, u32 mult, u32 shift)
{
- u64 ret = (u64)cycles;
- ret = (ret * cs->mult) >> cs->shift;
- return ret;
-}
-
-/**
- * clocksource_calculate_interval - Calculates a clocksource interval struct
- *
- * @c: Pointer to clocksource.
- * @length_nsec: Desired interval length in nanoseconds.
- *
- * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment
- * pair and interval request.
- *
- * Unless you're the timekeeping code, you should not be using this!
- */
-static inline void clocksource_calculate_interval(struct clocksource *c,
- unsigned long length_nsec)
-{
- u64 tmp;
-
- /* Do the ns -> cycle conversion first, using original mult */
- tmp = length_nsec;
- tmp <<= c->shift;
- tmp += c->mult_orig/2;
- do_div(tmp, c->mult_orig);
-
- c->cycle_interval = (cycle_t)tmp;
- if (c->cycle_interval == 0)
- c->cycle_interval = 1;
-
- /* Go back from cycles -> shifted ns, this time use ntp adjused mult */
- c->xtime_interval = (u64)c->cycle_interval * c->mult;
- c->raw_interval = ((u64)c->cycle_interval * c->mult_orig) >> c->shift;
+ return ((u64) cycles * mult) >> shift;
}
extern void clocksource_change_rating(struct clocksource *cs, int rating);
extern void clocksource_resume(void);
extern struct clocksource * __init __weak clocksource_default_clock(void);
+extern void clocksource_mark_unstable(struct clocksource *cs);
+
+extern void
+clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec);
+
+static inline void
+clocksource_calc_mult_shift(struct clocksource *cs, u32 freq, u32 minsec)
+{
+ return clocks_calc_mult_shift(&cs->mult, &cs->shift, freq,
+ NSEC_PER_SEC, minsec);
+}
#ifdef CONFIG_GENERIC_TIME_VSYSCALL
-extern void update_vsyscall(struct timespec *ts, struct clocksource *c);
+extern void
+update_vsyscall(struct timespec *ts, struct clocksource *c, u32 mult);
extern void update_vsyscall_tz(void);
#else
-static inline void update_vsyscall(struct timespec *ts, struct clocksource *c)
+static inline void
+update_vsyscall(struct timespec *ts, struct clocksource *c, u32 mult)
{
}
}
#endif
+extern void timekeeping_notify(struct clocksource *clock);
+
#endif /* _LINUX_CLOCKSOURCE_H */