[PATCH] remove pps support

This removes the support for pps.  It's completely unused within the kernel
and is basically in the way for further cleanups.  It should be easier to
readd proper support for it after the rest has been converted to NTP4
(where the pps mechanisms are quite different from NTP3 anyway).

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: Adrian Bunk <bunk@stusta.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 18 insertions, 54 deletions

diff --git a/kernel/time.c b/kernel/time.c
index 804539165d8b..e00a97b77241 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -202,24 +202,6 @@ asmlinkage long sys_settimeofday(struct timeval __user *tv,
         return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
 }
 
-long pps_offset;                /* pps time offset (us) */
-long pps_jitter = MAXTIME;      /* time dispersion (jitter) (us) */
-
-long pps_freq;                  /* frequency offset (scaled ppm) */
-long pps_stabil = MAXFREQ;      /* frequency dispersion (scaled ppm) */
-
-long pps_valid = PPS_VALID;     /* pps signal watchdog counter */
-
-int pps_shift = PPS_SHIFT;      /* interval duration (s) (shift) */
-
-long pps_jitcnt;                /* jitter limit exceeded */
-long pps_calcnt;                /* calibration intervals */
-long pps_errcnt;                /* calibration errors */
-long pps_stbcnt;                /* stability limit exceeded */
-
-/* hook for a loadable hardpps kernel module */
-void (*hardpps_ptr)(struct timeval *);
-
 /* we call this to notify the arch when the clock is being
  * controlled.  If no such arch routine, do nothing.
  */
@@ -279,7 +261,7 @@ int do_adjtimex(struct timex *txc)
                     result = -EINVAL;
                     goto leave;
                 }
-                time_freq = txc->freq - pps_freq;
+                time_freq = txc->freq;
             }
 
             if (txc->modes & ADJ_MAXERROR) {
@@ -312,10 +294,8 @@ int do_adjtimex(struct timex *txc)
                     if ((time_next_adjust = txc->offset) == 0)
                          time_adjust = 0;
                 }
-                else if ( time_status & (STA_PLL | STA_PPSTIME) ) {
-                    ltemp = (time_status & (STA_PPSTIME | STA_PPSSIGNAL)) ==
-                            (STA_PPSTIME | STA_PPSSIGNAL) ?
-                            pps_offset : txc->offset;
+                else if (time_status & STA_PLL) {
+                    ltemp = txc->offset;
 
                     /*
                      * Scale the phase adjustment and
@@ -356,23 +336,14 @@ int do_adjtimex(struct timex *txc)
                     }
                     time_freq = min(time_freq, time_tolerance);
                     time_freq = max(time_freq, -time_tolerance);
-                } /* STA_PLL || STA_PPSTIME */
+                } /* STA_PLL */
             } /* txc->modes & ADJ_OFFSET */
             if (txc->modes & ADJ_TICK) {
                 tick_usec = txc->tick;
                 tick_nsec = TICK_USEC_TO_NSEC(tick_usec);
             }
         } /* txc->modes */
-leave:  if ((time_status & (STA_UNSYNC|STA_CLOCKERR)) != 0
-            || ((time_status & (STA_PPSFREQ|STA_PPSTIME)) != 0
-                && (time_status & STA_PPSSIGNAL) == 0)
-            /* p. 24, (b) */
-            || ((time_status & (STA_PPSTIME|STA_PPSJITTER))
-                == (STA_PPSTIME|STA_PPSJITTER))
-            /* p. 24, (c) */
-            || ((time_status & STA_PPSFREQ) != 0
-                && (time_status & (STA_PPSWANDER|STA_PPSERROR)) != 0))
-            /* p. 24, (d) */
+leave:  if ((time_status & (STA_UNSYNC|STA_CLOCKERR)) != 0)
                 result = TIME_ERROR;
         
         if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT)
@@ -380,7 +351,7 @@ leave:	if ((time_status & (STA_UNSYNC|STA_CLOCKERR)) != 0
         else {
             txc->offset = shift_right(time_offset, SHIFT_UPDATE);
         }
-        txc->freq          = time_freq + pps_freq;
+        txc->freq          = time_freq;
         txc->maxerror      = time_maxerror;
         txc->esterror      = time_esterror;
         txc->status        = time_status;
@@ -388,14 +359,16 @@ leave:	if ((time_status & (STA_UNSYNC|STA_CLOCKERR)) != 0
         txc->precision     = time_precision;
         txc->tolerance     = time_tolerance;
         txc->tick          = tick_usec;
-        txc->ppsfreq       = pps_freq;
-        txc->jitter        = pps_jitter >> PPS_AVG;
-        txc->shift         = pps_shift;
-        txc->stabil        = pps_stabil;
-        txc->jitcnt        = pps_jitcnt;
-        txc->calcnt        = pps_calcnt;
-        txc->errcnt        = pps_errcnt;
-        txc->stbcnt        = pps_stbcnt;
+
+        /* PPS is not implemented, so these are zero */
+        txc->ppsfreq       = 0;
+        txc->jitter        = 0;
+        txc->shift         = 0;
+        txc->stabil        = 0;
+        txc->jitcnt        = 0;
+        txc->calcnt        = 0;
+        txc->errcnt        = 0;
+        txc->stbcnt        = 0;
         write_sequnlock_irq(&xtime_lock);
         do_gettimeofday(&txc->time);
         notify_arch_cmos_timer();
diff --git a/kernel/timer.c b/kernel/timer.c
index 13fa72cac7d8..ab189dd187cb 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -697,18 +697,9 @@ static void second_overflow(void)
 
         /*
          * Compute the frequency estimate and additional phase adjustment due
-         * to frequency error for the next second. When the PPS signal is
-         * engaged, gnaw on the watchdog counter and update the frequency
-         * computed by the pll and the PPS signal.
+         * to frequency error for the next second.
          */
-        pps_valid++;
-        if (pps_valid == PPS_VALID) {   /* PPS signal lost */
-                pps_jitter = MAXTIME;
-                pps_stabil = MAXFREQ;
-                time_status &= ~(STA_PPSSIGNAL | STA_PPSJITTER |
-                                STA_PPSWANDER | STA_PPSERROR);
-        }
-        ltemp = time_freq + pps_freq;
+        ltemp = time_freq;
         time_adj += shift_right(ltemp,(SHIFT_USEC + SHIFT_HZ - SHIFT_SCALE));
 
 #if HZ == 100