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/*
29 * Bits of the ptp_extts_request.flags field:
30 */
31#define PTP_ENABLE_FEATURE (1<<0)
32#define PTP_RISING_EDGE (1<<1)
33#define PTP_FALLING_EDGE (1<<2)
34#define PTP_STRICT_FLAGS (1<<3)
35#define PTP_EXT_OFFSET (1<<4)
36#define PTP_EXTTS_EDGES (PTP_RISING_EDGE | PTP_FALLING_EDGE)
37
38/*
39 * flag fields valid for the new PTP_EXTTS_REQUEST2 ioctl.
40 */
41#define PTP_EXTTS_VALID_FLAGS (PTP_ENABLE_FEATURE | \
42 PTP_RISING_EDGE | \
43 PTP_FALLING_EDGE | \
44 PTP_STRICT_FLAGS | \
45 PTP_EXT_OFFSET)
46
47/*
48 * flag fields valid for the original PTP_EXTTS_REQUEST ioctl.
49 * DO NOT ADD NEW FLAGS HERE.
50 */
51#define PTP_EXTTS_V1_VALID_FLAGS (PTP_ENABLE_FEATURE | \
52 PTP_RISING_EDGE | \
53 PTP_FALLING_EDGE)
54
55/*
56 * flag fields valid for the ptp_extts_event report.
57 */
58#define PTP_EXTTS_EVENT_VALID (PTP_ENABLE_FEATURE)
59
60/*
61 * Bits of the ptp_perout_request.flags field:
62 */
63#define PTP_PEROUT_ONE_SHOT (1<<0)
64#define PTP_PEROUT_DUTY_CYCLE (1<<1)
65#define PTP_PEROUT_PHASE (1<<2)
66
67/*
68 * flag fields valid for the new PTP_PEROUT_REQUEST2 ioctl.
69 */
70#define PTP_PEROUT_VALID_FLAGS (PTP_PEROUT_ONE_SHOT | \
71 PTP_PEROUT_DUTY_CYCLE | \
72 PTP_PEROUT_PHASE)
73
74/*
75 * No flags are valid for the original PTP_PEROUT_REQUEST ioctl
76 */
77#define PTP_PEROUT_V1_VALID_FLAGS (0)
78
79/*
80 * struct ptp_clock_time - represents a time value
81 *
82 * The sign of the seconds field applies to the whole value. The
83 * nanoseconds field is always unsigned. The reserved field is
84 * included for sub-nanosecond resolution, should the demand for
85 * this ever appear.
86 *
87 */
88struct ptp_clock_time {
89 __s64 sec; /* seconds */
90 __u32 nsec; /* nanoseconds */
91 __u32 reserved;
92};
93
94struct ptp_clock_caps {
95 int max_adj; /* Maximum frequency adjustment in parts per billon. */
96 int n_alarm; /* Number of programmable alarms. */
97 int n_ext_ts; /* Number of external time stamp channels. */
98 int n_per_out; /* Number of programmable periodic signals. */
99 int pps; /* Whether the clock supports a PPS callback. */
100 int n_pins; /* Number of input/output pins. */
101 /* Whether the clock supports precise system-device cross timestamps */
102 int cross_timestamping;
103 /* Whether the clock supports adjust phase */
104 int adjust_phase;
105 int max_phase_adj; /* Maximum phase adjustment in nanoseconds. */
106 int rsv[11]; /* Reserved for future use. */
107};
108
109struct ptp_extts_request {
110 unsigned int index; /* Which channel to configure. */
111 unsigned int flags; /* Bit field for PTP_xxx flags. */
112 unsigned int rsv[2]; /* Reserved for future use. */
113};
114
115struct ptp_perout_request {
116 union {
117 /*
118 * Absolute start time.
119 * Valid only if (flags & PTP_PEROUT_PHASE) is unset.
120 */
121 struct ptp_clock_time start;
122 /*
123 * Phase offset. The signal should start toggling at an
124 * unspecified integer multiple of the period, plus this value.
125 * The start time should be "as soon as possible".
126 * Valid only if (flags & PTP_PEROUT_PHASE) is set.
127 */
128 struct ptp_clock_time phase;
129 };
130 struct ptp_clock_time period; /* Desired period, zero means disable. */
131 unsigned int index; /* Which channel to configure. */
132 unsigned int flags;
133 union {
134 /*
135 * The "on" time of the signal.
136 * Must be lower than the period.
137 * Valid only if (flags & PTP_PEROUT_DUTY_CYCLE) is set.
138 */
139 struct ptp_clock_time on;
140 /* Reserved for future use. */
141 unsigned int rsv[4];
142 };
143};
144
145#define PTP_MAX_SAMPLES 25 /* Maximum allowed offset measurement samples. */
146
147struct ptp_sys_offset {
148 unsigned int n_samples; /* Desired number of measurements. */
149 unsigned int rsv[3]; /* Reserved for future use. */
150 /*
151 * Array of interleaved system/phc time stamps. The kernel
152 * will provide 2*n_samples + 1 time stamps, with the last
153 * one as a system time stamp.
154 */
155 struct ptp_clock_time ts[2 * PTP_MAX_SAMPLES + 1];
156};
157
158/*
159 * ptp_sys_offset_extended - data structure for IOCTL operation
160 * PTP_SYS_OFFSET_EXTENDED
161 *
162 * @n_samples: Desired number of measurements.
163 * @clockid: clockid of a clock-base used for pre/post timestamps.
164 * @rsv: Reserved for future use.
165 * @ts: Array of samples in the form [pre-TS, PHC, post-TS]. The
166 * kernel provides @n_samples.
167 *
168 * Starting from kernel 6.12 and onwards, the first word of the reserved-field
169 * is used for @clockid. That's backward compatible since previous kernel
170 * expect all three reserved words (@rsv[3]) to be 0 while the clockid (first
171 * word in the new structure) for CLOCK_REALTIME is '0'.
172 */
173struct ptp_sys_offset_extended {
174 unsigned int n_samples;
175 __kernel_clockid_t clockid;
176 unsigned int rsv[2];
177 struct ptp_clock_time ts[PTP_MAX_SAMPLES][3];
178};
179
180struct ptp_sys_offset_precise {
181 struct ptp_clock_time device;
182 struct ptp_clock_time sys_realtime;
183 struct ptp_clock_time sys_monoraw;
184 unsigned int rsv[4]; /* Reserved for future use. */
185};
186
187enum ptp_pin_function {
188 PTP_PF_NONE,
189 PTP_PF_EXTTS,
190 PTP_PF_PEROUT,
191 PTP_PF_PHYSYNC,
192};
193
194struct ptp_pin_desc {
195 /*
196 * Hardware specific human readable pin name. This field is
197 * set by the kernel during the PTP_PIN_GETFUNC ioctl and is
198 * ignored for the PTP_PIN_SETFUNC ioctl.
199 */
200 char name[64];
201 /*
202 * Pin index in the range of zero to ptp_clock_caps.n_pins - 1.
203 */
204 unsigned int index;
205 /*
206 * Which of the PTP_PF_xxx functions to use on this pin.
207 */
208 unsigned int func;
209 /*
210 * The specific channel to use for this function.
211 * This corresponds to the 'index' field of the
212 * PTP_EXTTS_REQUEST and PTP_PEROUT_REQUEST ioctls.
213 */
214 unsigned int chan;
215 /*
216 * Reserved for future use.
217 */
218 unsigned int rsv[5];
219};
220
221#define PTP_CLK_MAGIC '='
222
223#define PTP_CLOCK_GETCAPS _IOR(PTP_CLK_MAGIC, 1, struct ptp_clock_caps)
224#define PTP_EXTTS_REQUEST _IOW(PTP_CLK_MAGIC, 2, struct ptp_extts_request)
225#define PTP_PEROUT_REQUEST _IOW(PTP_CLK_MAGIC, 3, struct ptp_perout_request)
226#define PTP_ENABLE_PPS _IOW(PTP_CLK_MAGIC, 4, int)
227#define PTP_SYS_OFFSET _IOW(PTP_CLK_MAGIC, 5, struct ptp_sys_offset)
228#define PTP_PIN_GETFUNC _IOWR(PTP_CLK_MAGIC, 6, struct ptp_pin_desc)
229#define PTP_PIN_SETFUNC _IOW(PTP_CLK_MAGIC, 7, struct ptp_pin_desc)
230#define PTP_SYS_OFFSET_PRECISE \
231 _IOWR(PTP_CLK_MAGIC, 8, struct ptp_sys_offset_precise)
232#define PTP_SYS_OFFSET_EXTENDED \
233 _IOWR(PTP_CLK_MAGIC, 9, struct ptp_sys_offset_extended)
234
235#define PTP_CLOCK_GETCAPS2 _IOR(PTP_CLK_MAGIC, 10, struct ptp_clock_caps)
236#define PTP_EXTTS_REQUEST2 _IOW(PTP_CLK_MAGIC, 11, struct ptp_extts_request)
237#define PTP_PEROUT_REQUEST2 _IOW(PTP_CLK_MAGIC, 12, struct ptp_perout_request)
238#define PTP_ENABLE_PPS2 _IOW(PTP_CLK_MAGIC, 13, int)
239#define PTP_SYS_OFFSET2 _IOW(PTP_CLK_MAGIC, 14, struct ptp_sys_offset)
240#define PTP_PIN_GETFUNC2 _IOWR(PTP_CLK_MAGIC, 15, struct ptp_pin_desc)
241#define PTP_PIN_SETFUNC2 _IOW(PTP_CLK_MAGIC, 16, struct ptp_pin_desc)
242#define PTP_SYS_OFFSET_PRECISE2 \
243 _IOWR(PTP_CLK_MAGIC, 17, struct ptp_sys_offset_precise)
244#define PTP_SYS_OFFSET_EXTENDED2 \
245 _IOWR(PTP_CLK_MAGIC, 18, struct ptp_sys_offset_extended)
246#define PTP_MASK_CLEAR_ALL _IO(PTP_CLK_MAGIC, 19)
247#define PTP_MASK_EN_SINGLE _IOW(PTP_CLK_MAGIC, 20, unsigned int)
248
249struct ptp_extts_event {
250 struct ptp_clock_time t; /* Time event occurred. */
251 unsigned int index; /* Which channel produced the event. */
252 unsigned int flags; /* Event type. */
253 unsigned int rsv[2]; /* Reserved for future use. */
254};
255
256#endif
257

source code of linux/include/uapi/linux/ptp_clock.h

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