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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 | * @n_pins: The number of programmable pins. | |
53 | * @pps: Indicates whether the clock supports a PPS callback. | |
54 | * @pin_config: Array of length 'n_pins'. If the number of | |
55 | * programmable pins is nonzero, then drivers must | |
56 | * allocate and initialize this array. | |
57 | * | |
58 | * clock operations | |
59 | * | |
60 | * @adjfreq: Adjusts the frequency of the hardware clock. | |
61 | * parameter delta: Desired frequency offset from nominal frequency | |
62 | * in parts per billion | |
63 | * | |
64 | * @adjtime: Shifts the time of the hardware clock. | |
65 | * parameter delta: Desired change in nanoseconds. | |
66 | * | |
67 | * @gettime64: Reads the current time from the hardware clock. | |
68 | * parameter ts: Holds the result. | |
69 | * | |
70 | * @settime64: Set the current time on the hardware clock. | |
71 | * parameter ts: Time value to set. | |
72 | * | |
73 | * @enable: Request driver to enable or disable an ancillary feature. | |
74 | * parameter request: Desired resource to enable or disable. | |
75 | * parameter on: Caller passes one to enable or zero to disable. | |
76 | * | |
77 | * @verify: Confirm that a pin can perform a given function. The PTP | |
78 | * Hardware Clock subsystem maintains the 'pin_config' | |
79 | * array on behalf of the drivers, but the PHC subsystem | |
80 | * assumes that every pin can perform every function. This | |
81 | * hook gives drivers a way of telling the core about | |
82 | * limitations on specific pins. This function must return | |
83 | * zero if the function can be assigned to this pin, and | |
84 | * nonzero otherwise. | |
85 | * parameter pin: index of the pin in question. | |
86 | * parameter func: the desired function to use. | |
87 | * parameter chan: the function channel index to use. | |
88 | * | |
89 | * Drivers should embed their ptp_clock_info within a private | |
90 | * structure, obtaining a reference to it using container_of(). | |
91 | * | |
92 | * The callbacks must all return zero on success, non-zero otherwise. | |
93 | */ | |
94 | ||
95 | struct ptp_clock_info { | |
96 | struct module *owner; | |
97 | char name[16]; | |
98 | s32 max_adj; | |
99 | int n_alarm; | |
100 | int n_ext_ts; | |
101 | int n_per_out; | |
102 | int n_pins; | |
103 | int pps; | |
104 | struct ptp_pin_desc *pin_config; | |
105 | int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta); | |
106 | int (*adjtime)(struct ptp_clock_info *ptp, s64 delta); | |
107 | int (*gettime64)(struct ptp_clock_info *ptp, struct timespec64 *ts); | |
108 | int (*settime64)(struct ptp_clock_info *p, const struct timespec64 *ts); | |
109 | int (*enable)(struct ptp_clock_info *ptp, | |
110 | struct ptp_clock_request *request, int on); | |
111 | int (*verify)(struct ptp_clock_info *ptp, unsigned int pin, | |
112 | enum ptp_pin_function func, unsigned int chan); | |
113 | }; | |
114 | ||
115 | struct ptp_clock; | |
116 | ||
117 | /** | |
118 | * ptp_clock_register() - register a PTP hardware clock driver | |
119 | * | |
120 | * @info: Structure describing the new clock. | |
121 | * @parent: Pointer to the parent device of the new clock. | |
122 | */ | |
123 | ||
124 | extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, | |
125 | struct device *parent); | |
126 | ||
127 | /** | |
128 | * ptp_clock_unregister() - unregister a PTP hardware clock driver | |
129 | * | |
130 | * @ptp: The clock to remove from service. | |
131 | */ | |
132 | ||
133 | extern int ptp_clock_unregister(struct ptp_clock *ptp); | |
134 | ||
135 | ||
136 | enum ptp_clock_events { | |
137 | PTP_CLOCK_ALARM, | |
138 | PTP_CLOCK_EXTTS, | |
139 | PTP_CLOCK_PPS, | |
140 | PTP_CLOCK_PPSUSR, | |
141 | }; | |
142 | ||
143 | /** | |
144 | * struct ptp_clock_event - decribes a PTP hardware clock event | |
145 | * | |
146 | * @type: One of the ptp_clock_events enumeration values. | |
147 | * @index: Identifies the source of the event. | |
148 | * @timestamp: When the event occurred (%PTP_CLOCK_EXTTS only). | |
149 | * @pps_times: When the event occurred (%PTP_CLOCK_PPSUSR only). | |
150 | */ | |
151 | ||
152 | struct ptp_clock_event { | |
153 | int type; | |
154 | int index; | |
155 | union { | |
156 | u64 timestamp; | |
157 | struct pps_event_time pps_times; | |
158 | }; | |
159 | }; | |
160 | ||
161 | /** | |
162 | * ptp_clock_event() - notify the PTP layer about an event | |
163 | * | |
164 | * @ptp: The clock obtained from ptp_clock_register(). | |
165 | * @event: Message structure describing the event. | |
166 | */ | |
167 | ||
168 | extern void ptp_clock_event(struct ptp_clock *ptp, | |
169 | struct ptp_clock_event *event); | |
170 | ||
171 | /** | |
172 | * ptp_clock_index() - obtain the device index of a PTP clock | |
173 | * | |
174 | * @ptp: The clock obtained from ptp_clock_register(). | |
175 | */ | |
176 | ||
177 | extern int ptp_clock_index(struct ptp_clock *ptp); | |
178 | ||
179 | /** | |
180 | * ptp_find_pin() - obtain the pin index of a given auxiliary function | |
181 | * | |
182 | * @ptp: The clock obtained from ptp_clock_register(). | |
183 | * @func: One of the ptp_pin_function enumerated values. | |
184 | * @chan: The particular functional channel to find. | |
185 | * Return: Pin index in the range of zero to ptp_clock_caps.n_pins - 1, | |
186 | * or -1 if the auxiliary function cannot be found. | |
187 | */ | |
188 | ||
189 | int ptp_find_pin(struct ptp_clock *ptp, | |
190 | enum ptp_pin_function func, unsigned int chan); | |
191 | ||
192 | #endif |