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2016-11-09ptp: Introduce a high resolution frequency adjustment method.Richard Cochran1-1/+4
The internal PTP Hardware Clock (PHC) interface limits the resolution for frequency adjustments to one part per billion. However, some hardware devices allow finer adjustment, and making use of the increased resolution improves synchronization measurably on such devices. This patch adds an alternative method that allows finer frequency tuning by passing the scaled ppm value to PHC drivers. This value comes from user space, and it has a resolution of about 0.015 ppb. We also deprecate the older method, anticipating its removal once existing drivers have been converted over. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Suggested-by: Ulrik De Bie <ulrik.debie-os@e2big.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-10-03ptp: Fix resource leak in case of errorChristophe Jaillet1-0/+1
A call to 'ida_simple_remove()' is missing in the error handling path. This as been spotted with the following coccinelle script which tries to detect missing 'ida_simple_remove()' call in error handling paths. /////////////// @@ expression x; identifier l; @@ * x = ida_simple_get(...); ... if (...) { ... } ... if (...) { ... goto l; } ... * l: ... when != ida_simple_remove(...); Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-03-31ptp: remove 32 bit get/set methods.Richard Cochran1-11/+4
All of the PHC drivers have been converted to the new methods. This patch converts the three remaining callers within the core code and removes the older methods for good. As a result, the core PHC code is ready for the year 2038. However, some of the PHC drivers are not quite ready yet. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-03-31ptp: use the 64 bit get/set time methods for the posix clock.Richard Cochran1-2/+17
This patch changes the posix clock code to prefer the new methods whenever they are implemented by the PHC drivers. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-04-28ptp: validate the requested frequency adjustment.Richard Cochran1-1/+4
PTP Hardware Clock drivers specify a maximum frequency adjustment that their clocks can accommodate. Normally, user space programs will want to respect the advertised limits. However, no kernel or driver code checks that the dialed frequency offset is within the bounds, and out of range values can lead to surprising results. This patch fixes the issue by rejecting bad values. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-03-21ptp: introduce programmable pins.Richard Cochran1-0/+23
This patch adds a pair of new ioctls to the PTP Hardware Clock device interface. Using the ioctls, user space programs can query each pin to find out its current function and also reprogram a different function if desired. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-26PTP: convert class code to use dev_groupsGreg Kroah-Hartman1-1/+1
The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the ptp class code to use the correct field. Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-12ptp: dynamic allocation of PHC char devicesJiri Benc1-25/+13
As network adapters supporting PTP are becoming more common, machines with many NICs suddenly have many PHCs, too. The current limit of eight /dev/ptp* char devices (and thus, 8 network interfaces with PHC) is insufficient. Let the ptp driver allocate the char devices dynamically. Tested with 28 PHCs, removing and re-adding some of them. Thanks to Ben Hutchings for advice leading to simpler and cleaner patch. Signed-off-by: Jiri Benc <jbenc@redhat.com> Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-22ptp: link the phc device to its parent deviceRichard Cochran1-2/+3
PTP Hardware Clock devices appear as class devices in sysfs. This patch changes the registration API to use the parent device, clarifying the clock's relationship to the underlying device. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Acked-by: Ben Hutchings <bhutchings@solarflare.com> Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-22ptp: provide the clock's adjusted frequencyRichard Cochran1-2/+3
If the timex.mode field indicates a query, then we provide the value of the current frequency adjustment. [ Get rid of extraneous empty lines -DaveM ] Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-22ptp: remember the adjusted frequencyRichard Cochran1-0/+1
This patch adds a field to the representation of a PTP hardware clock in order to remember the frequency adjustment value dialed by the user. Adding this field will let us answer queries in the manner of adjtimex in a follow on patch. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-07pps/ptp: Allow PHC devices to adjust PPS events for known delayBen Hutchings1-0/+5
Initial version by Stuart Hodgson <smhodgson@solarflare.com> Some PHC device drivers may deliver PPS events with a significant and variable delay, but still be able to measure precisely what that delay is. Add a pps_sub_ts() function for subtracting a delay from the timestamp(s) in a PPS event, and a PTP event type (PTP_CLOCK_PPSUSR) for which the caller provides a complete PPS event. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
2012-04-04ptp: Add a method for obtaining the device index.Richard Cochran1-0/+6
This commit adds a method that MAC drivers may call in order to find out the device number of their associated PTP Hardware Clock. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-17phc: Update author's email address.Richard Cochran1-1/+1
This commit brings the author email address macros up to date for four modules in the PTP Hardware Clock subsystem. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-12-06ptp: Fix clock_getres() implementationThomas Gleixner1-1/+3
The clock_getres() function must return the resolution in the timespec argument and return 0 for success. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <john.stultz@linaro.org> Cc: stable@kernel.org Cc: Richard Cochran <richard.cochran@omicron.at>
2011-05-23ptp: Added a brand new class driver for ptp clocks.Richard Cochran1-0/+343
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>
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