include/uapi/linux/ptp_clock.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  * PTP 1588 clock support - user space interface
   4  *
   5  * Copyright (C) 2010 OMICRON electronics GmbH
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #ifndef _PTP_CLOCK_H_
  23 #define _PTP_CLOCK_H_
  24
  25 #include <linux/ioctl.h>
  26 #include <linux/types.h>
  27
  28 /* PTP_xxx bits, for the flags field within the request structures. */
  29 #define PTP_ENABLE_FEATURE (1<<0)
  30 #define PTP_RISING_EDGE    (1<<1)
  31 #define PTP_FALLING_EDGE   (1<<2)
  32
  33 /*
  34  * struct ptp_clock_time - represents a time value
  35  *
  36  * The sign of the seconds field applies to the whole value. The
  37  * nanoseconds field is always unsigned. The reserved field is
  38  * included for sub-nanosecond resolution, should the demand for
  39  * this ever appear.
  40  *
  41  */
  42 struct ptp_clock_time {
  43         __s64 sec;  /* seconds */
  44         __u32 nsec; /* nanoseconds */
  45         __u32 reserved;
  46 };
  47
  48 struct ptp_clock_caps {
  49         int max_adj;   /* Maximum frequency adjustment in parts per billon. */
  50         int n_alarm;   /* Number of programmable alarms. */
  51         int n_ext_ts;  /* Number of external time stamp channels. */
  52         int n_per_out; /* Number of programmable periodic signals. */
  53         int pps;       /* Whether the clock supports a PPS callback. */
  54         int n_pins;    /* Number of input/output pins. */
  55         /* Whether the clock supports precise system-device cross timestamps */
  56         int cross_timestamping;
  57         int rsv[13];   /* Reserved for future use. */
  58 };
  59
  60 struct ptp_extts_request {
  61         unsigned int index;  /* Which channel to configure. */
  62         unsigned int flags;  /* Bit field for PTP_xxx flags. */
  63         unsigned int rsv[2]; /* Reserved for future use. */
  64 };
  65
  66 struct ptp_perout_request {
  67         struct ptp_clock_time start;  /* Absolute start time. */
  68         struct ptp_clock_time period; /* Desired period, zero means disable. */
  69         unsigned int index;           /* Which channel to configure. */
  70         unsigned int flags;           /* Reserved for future use. */
  71         unsigned int rsv[4];          /* Reserved for future use. */
  72 };
  73
  74 #define PTP_MAX_SAMPLES 25 /* Maximum allowed offset measurement samples. */
  75
  76 struct ptp_sys_offset {
  77         unsigned int n_samples; /* Desired number of measurements. */
  78         unsigned int rsv[3];    /* Reserved for future use. */
  79         /*
  80          * Array of interleaved system/phc time stamps. The kernel
  81          * will provide 2*n_samples + 1 time stamps, with the last
  82          * one as a system time stamp.
  83          */
  84         struct ptp_clock_time ts[2 * PTP_MAX_SAMPLES + 1];
  85 };
  86
  87 struct ptp_sys_offset_precise {
  88         struct ptp_clock_time device;
  89         struct ptp_clock_time sys_realtime;
  90         struct ptp_clock_time sys_monoraw;
  91         unsigned int rsv[4];    /* Reserved for future use. */
  92 };
  93
  94 enum ptp_pin_function {
  95         PTP_PF_NONE,
  96         PTP_PF_EXTTS,
  97         PTP_PF_PEROUT,
  98         PTP_PF_PHYSYNC,
  99 };
 100
 101 struct ptp_pin_desc {
 102         /*
 103          * Hardware specific human readable pin name. This field is
 104          * set by the kernel during the PTP_PIN_GETFUNC ioctl and is
 105          * ignored for the PTP_PIN_SETFUNC ioctl.
 106          */
 107         char name[64];
 108         /*
 109          * Pin index in the range of zero to ptp_clock_caps.n_pins - 1.
 110          */
 111         unsigned int index;
 112         /*
 113          * Which of the PTP_PF_xxx functions to use on this pin.
 114          */
 115         unsigned int func;
 116         /*
 117          * The specific channel to use for this function.
 118          * This corresponds to the 'index' field of the
 119          * PTP_EXTTS_REQUEST and PTP_PEROUT_REQUEST ioctls.
 120          */
 121         unsigned int chan;
 122         /*
 123          * Reserved for future use.
 124          */
 125         unsigned int rsv[5];
 126 };
 127
 128 #define PTP_CLK_MAGIC '='
 129
 130 #define PTP_CLOCK_GETCAPS  _IOR(PTP_CLK_MAGIC, 1, struct ptp_clock_caps)
 131 #define PTP_EXTTS_REQUEST  _IOW(PTP_CLK_MAGIC, 2, struct ptp_extts_request)
 132 #define PTP_PEROUT_REQUEST _IOW(PTP_CLK_MAGIC, 3, struct ptp_perout_request)
 133 #define PTP_ENABLE_PPS     _IOW(PTP_CLK_MAGIC, 4, int)
 134 #define PTP_SYS_OFFSET     _IOW(PTP_CLK_MAGIC, 5, struct ptp_sys_offset)
 135 #define PTP_PIN_GETFUNC    _IOWR(PTP_CLK_MAGIC, 6, struct ptp_pin_desc)
 136 #define PTP_PIN_SETFUNC    _IOW(PTP_CLK_MAGIC, 7, struct ptp_pin_desc)
 137 #define PTP_SYS_OFFSET_PRECISE \
 138         _IOWR(PTP_CLK_MAGIC, 8, struct ptp_sys_offset_precise)
 139
 140 struct ptp_extts_event {
 141         struct ptp_clock_time t; /* Time event occured. */
 142         unsigned int index;      /* Which channel produced the event. */
 143         unsigned int flags;      /* Reserved for future use. */
 144         unsigned int rsv[2];     /* Reserved for future use. */
 145 };
 146
 147 #endif