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