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d94ba80ebb
This patch adds an infrastructure for hardware clocks that implement IEEE 1588, the Precision Time Protocol (PTP). A class driver offers a registration method to particular hardware clock drivers. Each clock is presented as a standard POSIX clock. The ancillary clock features are exposed in two different ways, via the sysfs and by a character device. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: John Stultz <john.stultz@linaro.org>
140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/*
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* PTP 1588 clock support
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*
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* Copyright (C) 2010 OMICRON electronics GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _PTP_CLOCK_KERNEL_H_
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#define _PTP_CLOCK_KERNEL_H_
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#include <linux/ptp_clock.h>
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struct ptp_clock_request {
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enum {
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PTP_CLK_REQ_EXTTS,
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PTP_CLK_REQ_PEROUT,
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PTP_CLK_REQ_PPS,
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} type;
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union {
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struct ptp_extts_request extts;
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struct ptp_perout_request perout;
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};
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};
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/**
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* struct ptp_clock_info - decribes a PTP hardware clock
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*
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* @owner: The clock driver should set to THIS_MODULE.
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* @name: A short name to identify the clock.
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* @max_adj: The maximum possible frequency adjustment, in parts per billon.
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* @n_alarm: The number of programmable alarms.
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* @n_ext_ts: The number of external time stamp channels.
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* @n_per_out: The number of programmable periodic signals.
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* @pps: Indicates whether the clock supports a PPS callback.
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*
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* clock operations
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*
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* @adjfreq: Adjusts the frequency of the hardware clock.
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* parameter delta: Desired period change in parts per billion.
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*
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* @adjtime: Shifts the time of the hardware clock.
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* parameter delta: Desired change in nanoseconds.
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*
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* @gettime: Reads the current time from the hardware clock.
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* parameter ts: Holds the result.
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*
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* @settime: Set the current time on the hardware clock.
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* parameter ts: Time value to set.
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*
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* @enable: Request driver to enable or disable an ancillary feature.
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* parameter request: Desired resource to enable or disable.
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* parameter on: Caller passes one to enable or zero to disable.
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*
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* Drivers should embed their ptp_clock_info within a private
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* structure, obtaining a reference to it using container_of().
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*
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* The callbacks must all return zero on success, non-zero otherwise.
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*/
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struct ptp_clock_info {
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struct module *owner;
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char name[16];
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s32 max_adj;
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int n_alarm;
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int n_ext_ts;
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int n_per_out;
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int pps;
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int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta);
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int (*adjtime)(struct ptp_clock_info *ptp, s64 delta);
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int (*gettime)(struct ptp_clock_info *ptp, struct timespec *ts);
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int (*settime)(struct ptp_clock_info *ptp, const struct timespec *ts);
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int (*enable)(struct ptp_clock_info *ptp,
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struct ptp_clock_request *request, int on);
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};
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struct ptp_clock;
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/**
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* ptp_clock_register() - register a PTP hardware clock driver
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*
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* @info: Structure describing the new clock.
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*/
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extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info);
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/**
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* ptp_clock_unregister() - unregister a PTP hardware clock driver
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*
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* @ptp: The clock to remove from service.
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*/
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extern int ptp_clock_unregister(struct ptp_clock *ptp);
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enum ptp_clock_events {
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PTP_CLOCK_ALARM,
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PTP_CLOCK_EXTTS,
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PTP_CLOCK_PPS,
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};
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/**
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* struct ptp_clock_event - decribes a PTP hardware clock event
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*
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* @type: One of the ptp_clock_events enumeration values.
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* @index: Identifies the source of the event.
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* @timestamp: When the event occured.
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*/
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struct ptp_clock_event {
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int type;
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int index;
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u64 timestamp;
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};
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/**
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* ptp_clock_event() - notify the PTP layer about an event
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*
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* @ptp: The clock obtained from ptp_clock_register().
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* @event: Message structure describing the event.
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*/
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extern void ptp_clock_event(struct ptp_clock *ptp,
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struct ptp_clock_event *event);
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#endif
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