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ptp: Added a brand new class driver for ptp clocks.

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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>
This commit is contained in:
Richard Cochran
2011-04-22 12:03:08 +02:00
committed by John Stultz
parent caebc160ce
commit d94ba80ebb
16 changed files with 1695 additions and 0 deletions
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84
include/linux/ptp_clock.h Normal file
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/*
* PTP 1588 clock support - user space interface
*
* 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_H_
#define _PTP_CLOCK_H_
#include <linux/ioctl.h>
#include <linux/types.h>
/* PTP_xxx bits, for the flags field within the request structures. */
#define PTP_ENABLE_FEATURE (1<<0)
#define PTP_RISING_EDGE (1<<1)
#define PTP_FALLING_EDGE (1<<2)
/*
* struct ptp_clock_time - represents a time value
*
* The sign of the seconds field applies to the whole value. The
* nanoseconds field is always unsigned. The reserved field is
* included for sub-nanosecond resolution, should the demand for
* this ever appear.
*
*/
struct ptp_clock_time {
__s64 sec; /* seconds */
__u32 nsec; /* nanoseconds */
__u32 reserved;
};
struct ptp_clock_caps {
int max_adj; /* Maximum frequency adjustment in parts per billon. */
int n_alarm; /* Number of programmable alarms. */
int n_ext_ts; /* Number of external time stamp channels. */
int n_per_out; /* Number of programmable periodic signals. */
int pps; /* Whether the clock supports a PPS callback. */
int rsv[15]; /* Reserved for future use. */
};
struct ptp_extts_request {
unsigned int index; /* Which channel to configure. */
unsigned int flags; /* Bit field for PTP_xxx flags. */
unsigned int rsv[2]; /* Reserved for future use. */
};
struct ptp_perout_request {
struct ptp_clock_time start; /* Absolute start time. */
struct ptp_clock_time period; /* Desired period, zero means disable. */
unsigned int index; /* Which channel to configure. */
unsigned int flags; /* Reserved for future use. */
unsigned int rsv[4]; /* Reserved for future use. */
};
#define PTP_CLK_MAGIC '='
#define PTP_CLOCK_GETCAPS _IOR(PTP_CLK_MAGIC, 1, struct ptp_clock_caps)
#define PTP_EXTTS_REQUEST _IOW(PTP_CLK_MAGIC, 2, struct ptp_extts_request)
#define PTP_PEROUT_REQUEST _IOW(PTP_CLK_MAGIC, 3, struct ptp_perout_request)
#define PTP_ENABLE_PPS _IOW(PTP_CLK_MAGIC, 4, int)
struct ptp_extts_event {
struct ptp_clock_time t; /* Time event occured. */
unsigned int index; /* Which channel produced the event. */
unsigned int flags; /* Reserved for future use. */
unsigned int rsv[2]; /* Reserved for future use. */
};
#endif