ntp: increase time_offset resolution

[linux-2.6] / include / linux / timex.h

diff --git a/include/linux/timex.h b/include/linux/timex.h
index 8ea3e71ba7fa8ff17d8de5587f482450c349ef36..9fbdd12a52f14e8742d50c2ceee2ce6e9b3dccf5 100644 (file)
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -58,6 +58,8 @@
 
 #include <asm/param.h>
 
+#define NTP_API                4       /* NTP API version */
+
 /*
  * SHIFT_KG and SHIFT_KF establish the damping of the PLL and are chosen
  * for a slightly underdamped convergence characteristic. SHIFT_KH
@@ -74,24 +76,22 @@
 #define MAXTC          10      /* maximum time constant (shift) */
 
 /*
- * The SHIFT_UPDATE define establishes the decimal point of the
- * time_offset variable which represents the current offset with
- * respect to standard time.
- *
  * SHIFT_USEC defines the scaling (shift) of the time_freq and
  * time_tolerance variables, which represent the current frequency
  * offset and maximum frequency tolerance.
  */
-#define SHIFT_UPDATE (SHIFT_HZ + 1) /* time offset scale (shift) */
 #define SHIFT_USEC 16          /* frequency offset scale (shift) */
-#define SHIFT_NSEC 12          /* kernel frequency offset scale */
-
-#define MAXPHASE 512000L        /* max phase error (us) */
-#define MAXFREQ (512L << SHIFT_USEC)  /* max frequency error (ppm) */
-#define MAXFREQ_NSEC (512000L << SHIFT_NSEC) /* max frequency error (ppb) */
+#define PPM_SCALE (NSEC_PER_USEC << (TICK_LENGTH_SHIFT - SHIFT_USEC))
+#define PPM_SCALE_INV_SHIFT 20
+#define PPM_SCALE_INV ((1ll << (PPM_SCALE_INV_SHIFT + TICK_LENGTH_SHIFT)) / \
+                      PPM_SCALE + 1)
+
+#define MAXPHASE 500000000l    /* max phase error (ns) */
+#define MAXFREQ 500000         /* max frequency error (ns/s) */
+#define MAXFREQ_SCALED ((s64)MAXFREQ << TICK_LENGTH_SHIFT)
 #define MINSEC 256             /* min interval between updates (s) */
 #define MAXSEC 2048            /* max interval between updates (s) */
-#define        NTP_PHASE_LIMIT (MAXPHASE << 5) /* beyond max. dispersion */
+#define NTP_PHASE_LIMIT ((MAXPHASE / NSEC_PER_USEC) << 5) /* beyond max. dispersion */
 
 /*
  * syscall interface - used (mainly by NTP daemon)
@@ -135,6 +135,8 @@ struct timex {
 #define ADJ_ESTERROR           0x0008  /* estimated time error */
 #define ADJ_STATUS             0x0010  /* clock status */
 #define ADJ_TIMECONST          0x0020  /* pll time constant */
+#define ADJ_MICRO              0x1000  /* select microsecond resolution */
+#define ADJ_NANO               0x2000  /* select nanosecond resolution */
 #define ADJ_TICK               0x4000  /* tick value */
 #define ADJ_OFFSET_SINGLESHOT  0x8001  /* old-fashioned adjtime */
 #define ADJ_OFFSET_SS_READ     0xa001  /* read-only adjtime */
@@ -146,8 +148,6 @@ struct timex {
 #define MOD_ESTERROR   ADJ_ESTERROR
 #define MOD_STATUS     ADJ_STATUS
 #define MOD_TIMECONST  ADJ_TIMECONST
-#define MOD_CLKB       ADJ_TICK
-#define MOD_CLKA       ADJ_OFFSET_SINGLESHOT /* 0x8000 in original */
 
 
 /*
@@ -169,9 +169,13 @@ struct timex {
 #define STA_PPSERROR   0x0800  /* PPS signal calibration error (ro) */
 
 #define STA_CLOCKERR   0x1000  /* clock hardware fault (ro) */
+#define STA_NANO       0x2000  /* resolution (0 = us, 1 = ns) (ro) */
+#define STA_MODE       0x4000  /* mode (0 = PLL, 1 = FLL) (ro) */
+#define STA_CLK                0x8000  /* clock source (0 = A, 1 = B) (ro) */
 
+/* read-only bits */
 #define STA_RONLY (STA_PPSSIGNAL | STA_PPSJITTER | STA_PPSWANDER | \
-    STA_PPSERROR | STA_CLOCKERR) /* read-only bits */
+       STA_PPSERROR | STA_CLOCKERR | STA_NANO | STA_MODE | STA_CLK)
 
 /*
  * Clock states (time_state)
@@ -203,8 +207,6 @@ extern int time_status;             /* clock synchronization status bits */
 extern long time_maxerror;     /* maximum error */
 extern long time_esterror;     /* estimated error */
 
-extern long time_freq;         /* frequency offset (scaled ppm) */
-
 extern long time_adjust;       /* The amount of adjtime left */
 
 extern void ntp_clear(void);