1 files changed, 11 insertions, 111 deletions

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 1219be4fb42e..83d2fbd81b93 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 */