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Richard Cochrand94ba802011-04-22 12:03:08 +02001/*
2 * PTP 1588 clock support
3 *
4 * Copyright (C) 2010 OMICRON electronics GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#ifndef _PTP_CLOCK_KERNEL_H_
22#define _PTP_CLOCK_KERNEL_H_
23
Richard Cochran1ef76152012-09-22 07:02:03 +000024#include <linux/device.h>
Ben Hutchings220a60a2012-09-03 11:34:58 +010025#include <linux/pps_kernel.h>
Richard Cochrand94ba802011-04-22 12:03:08 +020026#include <linux/ptp_clock.h>
27
28
29struct ptp_clock_request {
30 enum {
31 PTP_CLK_REQ_EXTTS,
32 PTP_CLK_REQ_PEROUT,
33 PTP_CLK_REQ_PPS,
34 } type;
35 union {
36 struct ptp_extts_request extts;
37 struct ptp_perout_request perout;
38 };
39};
40
41/**
42 * struct ptp_clock_info - decribes a PTP hardware clock
43 *
44 * @owner: The clock driver should set to THIS_MODULE.
Richard Cochrande465842012-09-22 07:02:04 +000045 * @name: A short "friendly name" to identify the clock and to
46 * help distinguish PHY based devices from MAC based ones.
47 * The string is not meant to be a unique id.
Richard Cochrand94ba802011-04-22 12:03:08 +020048 * @max_adj: The maximum possible frequency adjustment, in parts per billon.
49 * @n_alarm: The number of programmable alarms.
50 * @n_ext_ts: The number of external time stamp channels.
51 * @n_per_out: The number of programmable periodic signals.
52 * @pps: Indicates whether the clock supports a PPS callback.
53 *
54 * clock operations
55 *
56 * @adjfreq: Adjusts the frequency of the hardware clock.
57 * parameter delta: Desired period change in parts per billion.
58 *
59 * @adjtime: Shifts the time of the hardware clock.
60 * parameter delta: Desired change in nanoseconds.
61 *
62 * @gettime: Reads the current time from the hardware clock.
63 * parameter ts: Holds the result.
64 *
65 * @settime: Set the current time on the hardware clock.
66 * parameter ts: Time value to set.
67 *
68 * @enable: Request driver to enable or disable an ancillary feature.
69 * parameter request: Desired resource to enable or disable.
70 * parameter on: Caller passes one to enable or zero to disable.
71 *
72 * Drivers should embed their ptp_clock_info within a private
73 * structure, obtaining a reference to it using container_of().
74 *
75 * The callbacks must all return zero on success, non-zero otherwise.
76 */
77
78struct ptp_clock_info {
79 struct module *owner;
80 char name[16];
81 s32 max_adj;
82 int n_alarm;
83 int n_ext_ts;
84 int n_per_out;
85 int pps;
86 int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta);
87 int (*adjtime)(struct ptp_clock_info *ptp, s64 delta);
88 int (*gettime)(struct ptp_clock_info *ptp, struct timespec *ts);
89 int (*settime)(struct ptp_clock_info *ptp, const struct timespec *ts);
90 int (*enable)(struct ptp_clock_info *ptp,
91 struct ptp_clock_request *request, int on);
92};
93
94struct ptp_clock;
95
96/**
97 * ptp_clock_register() - register a PTP hardware clock driver
98 *
Richard Cochran1ef76152012-09-22 07:02:03 +000099 * @info: Structure describing the new clock.
100 * @parent: Pointer to the parent device of the new clock.
Richard Cochrand94ba802011-04-22 12:03:08 +0200101 */
102
Richard Cochran1ef76152012-09-22 07:02:03 +0000103extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
104 struct device *parent);
Richard Cochrand94ba802011-04-22 12:03:08 +0200105
106/**
107 * ptp_clock_unregister() - unregister a PTP hardware clock driver
108 *
109 * @ptp: The clock to remove from service.
110 */
111
112extern int ptp_clock_unregister(struct ptp_clock *ptp);
113
114
115enum ptp_clock_events {
116 PTP_CLOCK_ALARM,
117 PTP_CLOCK_EXTTS,
118 PTP_CLOCK_PPS,
Ben Hutchings220a60a2012-09-03 11:34:58 +0100119 PTP_CLOCK_PPSUSR,
Richard Cochrand94ba802011-04-22 12:03:08 +0200120};
121
122/**
123 * struct ptp_clock_event - decribes a PTP hardware clock event
124 *
125 * @type: One of the ptp_clock_events enumeration values.
126 * @index: Identifies the source of the event.
Ben Hutchings220a60a2012-09-03 11:34:58 +0100127 * @timestamp: When the event occurred (%PTP_CLOCK_EXTTS only).
128 * @pps_times: When the event occurred (%PTP_CLOCK_PPSUSR only).
Richard Cochrand94ba802011-04-22 12:03:08 +0200129 */
130
131struct ptp_clock_event {
132 int type;
133 int index;
Ben Hutchings220a60a2012-09-03 11:34:58 +0100134 union {
135 u64 timestamp;
136 struct pps_event_time pps_times;
137 };
Richard Cochrand94ba802011-04-22 12:03:08 +0200138};
139
140/**
141 * ptp_clock_event() - notify the PTP layer about an event
142 *
143 * @ptp: The clock obtained from ptp_clock_register().
144 * @event: Message structure describing the event.
145 */
146
147extern void ptp_clock_event(struct ptp_clock *ptp,
148 struct ptp_clock_event *event);
149
Richard Cochran995a9092012-04-03 22:59:16 +0000150/**
151 * ptp_clock_index() - obtain the device index of a PTP clock
152 *
153 * @ptp: The clock obtained from ptp_clock_register().
154 */
155
156extern int ptp_clock_index(struct ptp_clock *ptp);
157
Richard Cochrand94ba802011-04-22 12:03:08 +0200158#endif