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1 | /* | |
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 | ||
24 | #include <linux/device.h> | |
25 | #include <linux/pps_kernel.h> | |
26 | #include <linux/ptp_clock.h> | |
27 | ||
28 | ||
29 | struct 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. | |
45 | * @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. | |
48 | * @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 frequency offset from nominal frequency | |
58 | * in parts per billion | |
59 | * | |
60 | * @adjtime: Shifts the time of the hardware clock. | |
61 | * parameter delta: Desired change in nanoseconds. | |
62 | * | |
63 | * @gettime: Reads the current time from the hardware clock. | |
64 | * parameter ts: Holds the result. | |
65 | * | |
66 | * @settime: Set the current time on the hardware clock. | |
67 | * parameter ts: Time value to set. | |
68 | * | |
69 | * @enable: Request driver to enable or disable an ancillary feature. | |
70 | * parameter request: Desired resource to enable or disable. | |
71 | * parameter on: Caller passes one to enable or zero to disable. | |
72 | * | |
73 | * Drivers should embed their ptp_clock_info within a private | |
74 | * structure, obtaining a reference to it using container_of(). | |
75 | * | |
76 | * The callbacks must all return zero on success, non-zero otherwise. | |
77 | */ | |
78 | ||
79 | struct ptp_clock_info { | |
80 | struct module *owner; | |
81 | char name[16]; | |
82 | s32 max_adj; | |
83 | int n_alarm; | |
84 | int n_ext_ts; | |
85 | int n_per_out; | |
86 | int pps; | |
87 | int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta); | |
88 | int (*adjtime)(struct ptp_clock_info *ptp, s64 delta); | |
89 | int (*gettime)(struct ptp_clock_info *ptp, struct timespec *ts); | |
90 | int (*settime)(struct ptp_clock_info *ptp, const struct timespec *ts); | |
91 | int (*enable)(struct ptp_clock_info *ptp, | |
92 | struct ptp_clock_request *request, int on); | |
93 | }; | |
94 | ||
95 | struct ptp_clock; | |
96 | ||
97 | /** | |
98 | * ptp_clock_register() - register a PTP hardware clock driver | |
99 | * | |
100 | * @info: Structure describing the new clock. | |
101 | * @parent: Pointer to the parent device of the new clock. | |
102 | */ | |
103 | ||
104 | extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, | |
105 | struct device *parent); | |
106 | ||
107 | /** | |
108 | * ptp_clock_unregister() - unregister a PTP hardware clock driver | |
109 | * | |
110 | * @ptp: The clock to remove from service. | |
111 | */ | |
112 | ||
113 | extern int ptp_clock_unregister(struct ptp_clock *ptp); | |
114 | ||
115 | ||
116 | enum ptp_clock_events { | |
117 | PTP_CLOCK_ALARM, | |
118 | PTP_CLOCK_EXTTS, | |
119 | PTP_CLOCK_PPS, | |
120 | PTP_CLOCK_PPSUSR, | |
121 | }; | |
122 | ||
123 | /** | |
124 | * struct ptp_clock_event - decribes a PTP hardware clock event | |
125 | * | |
126 | * @type: One of the ptp_clock_events enumeration values. | |
127 | * @index: Identifies the source of the event. | |
128 | * @timestamp: When the event occurred (%PTP_CLOCK_EXTTS only). | |
129 | * @pps_times: When the event occurred (%PTP_CLOCK_PPSUSR only). | |
130 | */ | |
131 | ||
132 | struct ptp_clock_event { | |
133 | int type; | |
134 | int index; | |
135 | union { | |
136 | u64 timestamp; | |
137 | struct pps_event_time pps_times; | |
138 | }; | |
139 | }; | |
140 | ||
141 | /** | |
142 | * ptp_clock_event() - notify the PTP layer about an event | |
143 | * | |
144 | * @ptp: The clock obtained from ptp_clock_register(). | |
145 | * @event: Message structure describing the event. | |
146 | */ | |
147 | ||
148 | extern void ptp_clock_event(struct ptp_clock *ptp, | |
149 | struct ptp_clock_event *event); | |
150 | ||
151 | /** | |
152 | * ptp_clock_index() - obtain the device index of a PTP clock | |
153 | * | |
154 | * @ptp: The clock obtained from ptp_clock_register(). | |
155 | */ | |
156 | ||
157 | extern int ptp_clock_index(struct ptp_clock *ptp); | |
158 | ||
159 | #endif |