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 148