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-rw-r--r--include/linux/clocksource.h122
1 files changed, 11 insertions, 111 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 1219be4fb42..83d2fbd81b9 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -14,6 +14,7 @@
#include <linux/list.h>
#include <linux/cache.h>
#include <linux/timer.h>
+#include <linux/init.h>
#include <asm/div64.h>
#include <asm/io.h>
@@ -148,14 +149,11 @@ extern u64 timecounter_cyc2time(struct timecounter *tc,
* @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)
* @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 {
/*
@@ -169,7 +167,6 @@ struct clocksource {
void (*disable)(struct clocksource *cs);
cycle_t mask;
u32 mult;
- u32 mult_orig;
u32 shift;
unsigned long flags;
cycle_t (*vread)(void);
@@ -181,19 +178,12 @@ struct clocksource {
#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 */
@@ -202,8 +192,6 @@ struct clocksource {
#endif
};
-extern struct clocksource *clock; /* current clocksource */
-
/*
* Clock source flags bits::
*/
@@ -212,6 +200,7 @@ extern struct clocksource *clock; /* current clocksource */
#define CLOCK_SOURCE_WATCHDOG 0x10
#define CLOCK_SOURCE_VALID_FOR_HRES 0x20
+#define CLOCK_SOURCE_UNSTABLE 0x40
/* simplify initialization of mask field */
#define CLOCKSOURCE_MASK(bits) (cycle_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
@@ -268,108 +257,15 @@ static inline u32 clocksource_hz2mult(u32 hz, u32 shift_constant)
}
/**
- * 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 clocksource_read(struct clocksource *cs)
-{
- return cs->read(cs);
-}
-
-/**
- * clocksource_enable: - enable clocksource
- * @cs: pointer to clocksource
- *
- * Enables the specified clocksource. The clocksource callback
- * function should start up the hardware and setup mult and field
- * members of struct clocksource to reflect hardware capabilities.
- */
-static inline int clocksource_enable(struct clocksource *cs)
-{
- int ret = 0;
-
- if (cs->enable)
- ret = cs->enable(cs);
-
- /*
- * The frequency may have changed while the clocksource
- * was disabled. If so the code in ->enable() must update
- * the mult value to reflect the new frequency. Make sure
- * mult_orig follows this change.
- */
- cs->mult_orig = cs->mult;
-
- return ret;
-}
-
-/**
- * clocksource_disable: - disable clocksource
- * @cs: pointer to clocksource
- *
- * Disables the specified clocksource. The clocksource callback
- * function should power down the now unused hardware block to
- * save power.
- */
-static inline void clocksource_disable(struct clocksource *cs)
-{
- /*
- * Save mult_orig in mult so clocksource_enable() can
- * restore the value regardless if ->enable() updates
- * the value of mult or not.
- */
- cs->mult = cs->mult_orig;
-
- if (cs->disable)
- cs->disable(cs);
-}
-
-/**
- * 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)
-{
- 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)
+static inline s64 clocksource_cyc2ns(cycle_t cycles, u32 mult, u32 shift)
{
- 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;
}
@@ -380,6 +276,8 @@ extern void clocksource_touch_watchdog(void);
extern struct clocksource* clocksource_get_next(void);
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);
#ifdef CONFIG_GENERIC_TIME_VSYSCALL
extern void update_vsyscall(struct timespec *ts, struct clocksource *c);
@@ -394,4 +292,6 @@ static inline void update_vsyscall_tz(void)
}
#endif
+extern void timekeeping_notify(struct clocksource *clock);
+
#endif /* _LINUX_CLOCKSOURCE_H */