ts2phc: Support using a PHC as the master clock.
This patch introduces a new ts2phc source using a PHC device. There are multiple use cases for such a master. By connecting pins of two or more separate PHC devices together, one may act as the source, and the others may be synchronized to it in hardware. In this way, "just a bunch of devices" together forms a Transparent Clock. If the master clock is synchronized to a global time source (like a PPS from a GPS), then the system becomes a mutli-port Grand Master or a Boundary Clock with GM capability. Signed-off-by: Richard Cochran <richardcochran@gmail.com>master
parent
1bdc9143aa
commit
9c6e0f57b3
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@ -0,0 +1,27 @@
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#
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# This example shows ts2phc keeping a group of three Intel i210 cards
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# synchronized to each other in order to form a Transparent Clock.
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# The cards are configured to use their SDP0 pins connected in
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# hardware. Here eth3 and eth4 will be slaved to eth6.
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#
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# Important! The polarity is set to "both" because the i210 always
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# time stamps both the rising and the falling edges of the input
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# signal.
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#
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[global]
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use_syslog 0
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verbose 1
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logging_level 6
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ts2phc.pulsewidth 500000000
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[eth6]
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ts2phc.channel 0
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ts2phc.master 1
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ts2phc.pin_index 0
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[eth3]
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ts2phc.channel 0
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ts2phc.extts_polarity both
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ts2phc.pin_index 0
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[eth4]
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ts2phc.channel 0
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ts2phc.extts_polarity both
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ts2phc.pin_index 0
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3
makefile
3
makefile
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@ -26,7 +26,8 @@ PRG = ptp4l hwstamp_ctl nsm phc2sys phc_ctl pmc timemaster ts2phc
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FILTERS = filter.o mave.o mmedian.o
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SERVOS = linreg.o ntpshm.o nullf.o pi.o servo.o
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TRANSP = raw.o transport.o udp.o udp6.o uds.o
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TS2PHC = ts2phc.o ts2phc_generic_master.o ts2phc_master.o ts2phc_slave.o
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TS2PHC = ts2phc.o ts2phc_generic_master.o ts2phc_master.o ts2phc_phc_master.o \
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ts2phc_slave.o
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OBJ = bmc.o clock.o clockadj.o clockcheck.o config.o designated_fsm.o \
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e2e_tc.o fault.o $(FILTERS) fsm.o hash.o interface.o msg.o phc.o port.o \
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port_signaling.o pqueue.o print.o ptp4l.o p2p_tc.o rtnl.o $(SERVOS) sk.o \
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6
ts2phc.c
6
ts2phc.c
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@ -45,6 +45,8 @@ static void usage(char *progname)
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" -s [dev|name] source of the PPS signal\n"
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" may take any of the following forms:\n"
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" generic - an external 1-PPS without ToD information\n"
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" /dev/ptp0 - a local PTP Hardware Clock (PHC)\n"
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" eth0 - a local PTP Hardware Clock (PHC)\n"
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" -v prints the software version and exits\n"
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"\n",
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progname);
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@ -179,7 +181,11 @@ int main(int argc, char *argv[])
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return -1;
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}
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if (!strcasecmp(pps_source, "generic")) {
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pps_type = TS2PHC_MASTER_GENERIC;
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} else {
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pps_type = TS2PHC_MASTER_PHC;
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}
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master = ts2phc_master_create(cfg, pps_source, pps_type);
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if (!master) {
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fprintf(stderr, "failed to create master\n");
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@ -5,6 +5,7 @@
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*/
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#include "ts2phc_generic_master.h"
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#include "ts2phc_master_private.h"
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#include "ts2phc_phc_master.h"
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struct ts2phc_master *ts2phc_master_create(struct config *cfg, const char *dev,
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enum ts2phc_master_type type)
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@ -18,6 +19,7 @@ struct ts2phc_master *ts2phc_master_create(struct config *cfg, const char *dev,
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case TS2PHC_MASTER_NMEA:
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break;
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case TS2PHC_MASTER_PHC:
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master = ts2phc_phc_master_create(cfg, dev);
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break;
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}
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return master;
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@ -0,0 +1,113 @@
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/**
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* @file ts2phc_phc_master.c
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* @note Copyright (C) 2019 Richard Cochran <richardcochran@gmail.com>
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* @note SPDX-License-Identifier: GPL-2.0+
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*/
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#include <linux/ptp_clock.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include "config.h"
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#include "phc.h"
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#include "print.h"
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#include "missing.h"
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#include "ts2phc_master_private.h"
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#include "ts2phc_phc_master.h"
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#include "util.h"
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struct ts2phc_phc_master {
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struct ts2phc_master master;
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clockid_t clkid;
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int channel;
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int fd;
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};
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static int ts2phc_phc_master_activate(struct config *cfg, const char *dev,
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struct ts2phc_phc_master *master)
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{
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struct ptp_perout_request perout_request;
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struct ptp_pin_desc desc;
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struct timespec ts;
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memset(&desc, 0, sizeof(desc));
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master->channel = config_get_int(cfg, dev, "ts2phc.channel");
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desc.index = config_get_int(cfg, dev, "ts2phc.pin_index");
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desc.func = PTP_PF_PEROUT;
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desc.chan = master->channel;
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if (phc_pin_setfunc(master->clkid, &desc)) {
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pr_warning("Failed to set the pin. Continuing bravely on...");
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}
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if (clock_gettime(master->clkid, &ts)) {
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perror("clock_gettime");
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return -1;
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}
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memset(&perout_request, 0, sizeof(perout_request));
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perout_request.index = master->channel;
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perout_request.start.sec = ts.tv_sec + 2;
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perout_request.start.nsec = 0;
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perout_request.period.sec = 1;
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perout_request.period.nsec = 0;
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if (ioctl(master->fd, PTP_PEROUT_REQUEST2, &perout_request)) {
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pr_err(PTP_PEROUT_REQUEST_FAILED);
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return -1;
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}
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return 0;
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}
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static void ts2phc_phc_master_destroy(struct ts2phc_master *master)
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{
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struct ts2phc_phc_master *m =
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container_of(master, struct ts2phc_phc_master, master);
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struct ptp_perout_request perout_request;
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memset(&perout_request, 0, sizeof(perout_request));
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perout_request.index = m->channel;
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if (ioctl(m->fd, PTP_PEROUT_REQUEST2, &perout_request)) {
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pr_err(PTP_PEROUT_REQUEST_FAILED);
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}
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posix_clock_close(m->clkid);
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free(m);
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}
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static int ts2phc_phc_master_getppstime(struct ts2phc_master *m,
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struct timespec *ts)
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{
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struct ts2phc_phc_master *master =
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container_of(m, struct ts2phc_phc_master, master);
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return clock_gettime(master->clkid, ts);
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}
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struct ts2phc_master *ts2phc_phc_master_create(struct config *cfg,
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const char *dev)
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{
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struct ts2phc_phc_master *master;
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int junk;
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master = calloc(1, sizeof(*master));
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if (!master) {
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return NULL;
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}
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master->master.destroy = ts2phc_phc_master_destroy;
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master->master.getppstime = ts2phc_phc_master_getppstime;
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master->clkid = posix_clock_open(dev, &junk);
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if (master->clkid == CLOCK_INVALID) {
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free(master);
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return NULL;
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}
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master->fd = CLOCKID_TO_FD(master->clkid);
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pr_debug("PHC master %s has ptp index %d", dev, junk);
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if (ts2phc_phc_master_activate(cfg, dev, master)) {
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ts2phc_phc_master_destroy(&master->master);
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return NULL;
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}
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return &master->master;
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}
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@ -0,0 +1,14 @@
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/**
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* @file ts2phc_phc_master.h
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* @note Copyright (C) 2019 Richard Cochran <richardcochran@gmail.com>
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* @note SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef HAVE_TS2PHC_PHC_MASTER_H
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#define HAVE_TS2PHC_PHC_MASTER_H
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#include "ts2phc_master.h"
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struct ts2phc_master *ts2phc_phc_master_create(struct config *cfg,
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const char *dev);
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#endif
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