All,
Since the NTP PPS code required an out of tree patch which I don't
believe there is a 2.6 version of, this patch removes the unused PPS
logic in the kernel.
Any comments or feedback would be greatly appreciated.
thanks
-john
linux-2.6.13-rc3_timeofday-ntp-part3_B4.patch
============================================
diff --git a/kernel/ntp.c b/kernel/ntp.c
--- a/kernel/ntp.c
+++ b/kernel/ntp.c
@@ -46,26 +46,9 @@ void time_interpolator_update(long delta
#define time_interpolator_update(x)
#endif
-
-static long pps_offset; /* pps time offset (us) */
-static long pps_jitter = MAXTIME; /* time dispersion (jitter) (us) */
-
-static long pps_freq; /* frequency offset (scaled ppm) */
-static long pps_stabil = MAXFREQ; /* frequency dispersion (scaled ppm) */
-
-static long pps_valid = PPS_VALID; /* pps signal watchdog counter */
-
-static int pps_shift = PPS_SHIFT; /* interval duration (s) (shift) */
-
-static long pps_jitcnt; /* jitter limit exceeded */
-static long pps_calcnt; /* calibration intervals */
-static long pps_errcnt; /* calibration errors */
-static long pps_stbcnt; /* stability limit exceeded */
-
/* Don't completely fail for HZ > 500. */
int tickadj = 500/HZ ? : 1; /* microsecs */
-
/*
* phase-lock loop variables
*/
@@ -235,21 +218,7 @@ void second_overflow(void)
time_adj = ltemp << (SHIFT_SCALE - SHIFT_HZ - SHIFT_UPDATE);
}
- /*
- * 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.
- */
- 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;
if (ltemp < 0)
time_adj -= -ltemp >> (SHIFT_USEC + SHIFT_HZ - SHIFT_SCALE);
else
@@ -307,10 +276,6 @@ int ntp_adjtimex(struct timex *txc)
/* Save for later - semantics of adjtime is to return old value */
save_adjust = time_next_adjust ? time_next_adjust : time_adjust;
-#if 0 /* STA_CLOCKERR is never set yet */
- time_status &= ~STA_CLOCKERR; /* reset STA_CLOCKERR */
-#endif
-
/* If there are input parameters, then process them */
if (txc->modes) {
if (txc->modes & ADJ_STATUS) /* only set allowed bits */
@@ -322,7 +287,7 @@ int ntp_adjtimex(struct timex *txc)
result = -EINVAL;
goto leave;
}
- time_freq = txc->freq - pps_freq;
+ time_freq = txc->freq;
}
if (txc->modes & ADJ_MAXERROR) {
@@ -356,11 +321,8 @@ int ntp_adjtimex(struct timex *txc)
/* adjtime() is independent from ntp_adjtime() */
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
@@ -415,7 +377,7 @@ int ntp_adjtimex(struct timex *txc)
time_freq = time_tolerance;
else if (time_freq < -time_tolerance)
time_freq = -time_tolerance;
- } /* STA_PLL || STA_PPSTIME */
+ } /* STA_PLL */
} /* txc->modes & ADJ_OFFSET */
if (txc->modes & ADJ_TICK) {
@@ -425,17 +387,8 @@ int ntp_adjtimex(struct timex *txc)
} /* 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) */
- result = TIME_ERROR;
+ if ((time_status & (STA_UNSYNC|STA_CLOCKERR)) != 0)
+ result = TIME_ERROR;
if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT)
txc->offset = save_adjust;
@@ -445,7 +398,7 @@ leave:
else
txc->offset = 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;
@@ -453,14 +406,17 @@ leave:
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);
return result;
-
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