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  1. 14 Nov, 2019 4 commits
    • Vladimir Oltean's avatar
      net: dsa: sja1105: Simplify reset handling · abfb228a
      Vladimir Oltean authored 
      We don't really need 10k species of reset. Remove everything except cold
reset which is what is actually used. Too bad the hardware designers
couldn't agree to use the same bit field for rev 1 and rev 2, so the
(*reset_cmd) function pointer is there to stay.

However let's simplify the prototype and give it a struct dsa_switch (we
want to avoid forward-declarations of structures, in this case struct
sja1105_private, wherever we can).
Signed-off-by: default avatarVladimir Oltean <olteanv@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      abfb228a
    • David S. Miller's avatar
      Merge branch 'PTP-clock-source-for-SJA1105-tc-taprio-offload' · ccb68993
      David S. Miller authored 
      Vladimir Oltean says:

====================
PTP clock source for SJA1105 tc-taprio offload

This series makes the IEEE 802.1Qbv egress scheduler of the sja1105
switch use a time reference that is synchronized to the network. This
enables quite a few real Time Sensitive Networking use cases, since in
this mode the switch can offer its clients a TDMA sort of access to the
network, and guaranteed latency for frames that are properly scheduled
based on the common PTP time.

The driver needs to do a 2-part activity:
- Program the gate control list into the static config and upload it
  over SPI to the switch (already supported)
- Write the activation time of the scheduler (base-time) into the
  PTPSCHTM register, and set the PTPSTRTSCH bit.
- Monitor the activation of the scheduler at the planned time and its
  health.

Ok, 3 parts.

The time-aware scheduler cannot be programmed to activate at a time in
the past, and there is some logic to avoid that.

PTPCLKCORP is one of those "black magic" registers that just need to be
written to the length of the cycle. There is a 40-line long comment in
the second patch which explains why.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ccb68993
    • Vladimir Oltean's avatar
      net: dsa: sja1105: Implement state machine for TAS with PTP clock source · 86db36a3
      Vladimir Oltean authored 
      Tested using the following bash script and the tc from iproute2-next:

	#!/bin/bash

	set -e -u -o pipefail

	NSEC_PER_SEC="1000000000"

	gatemask() {
		local tc_list="$1"
		local mask=0

		for tc in ${tc_list}; do
			mask=$((${mask} | (1 << ${tc})))
		done

		printf "%02x" ${mask}
	}

	if ! systemctl is-active --quiet ptp4l; then
		echo "Please start the ptp4l service"
		exit
	fi

	now=$(phc_ctl /dev/ptp1 get | gawk '/clock time is/ { print $5; }')
	# Phase-align the base time to the start of the next second.
	sec=$(echo "${now}" | gawk -F. '{ print $1; }')
	base_time="$(((${sec} + 1) * ${NSEC_PER_SEC}))"

	tc qdisc add dev swp5 parent root handle 100 taprio \
		num_tc 8 \
		map 0 1 2 3 5 6 7 \
		queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 \
		base-time ${base_time} \
		sched-entry S $(gatemask 7) 100000 \
		sched-entry S $(gatemask "0 1 2 3 4 5 6") 400000 \
		clockid CLOCK_TAI flags 2

The "state machine" is a workqueue invoked after each manipulation
command on the PTP clock (reset, adjust time, set time, adjust
frequency) which checks over the state of the time-aware scheduler.
So it is not monitored periodically, only in reaction to a PTP command
typically triggered from a userspace daemon (linuxptp). Otherwise there
is no reason for things to go wrong.

Now that the timecounter/cyclecounter has been replaced with hardware
operations on the PTP clock, the TAS Kconfig now depends upon PTP and
the standalone clocksource operating mode has been removed.
Signed-off-by: default avatarVladimir Oltean <olteanv@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      86db36a3
    • Vladimir Oltean's avatar
      net: dsa: sja1105: Make the PTP command read-write · 41603d78
      Vladimir Oltean authored 
      The PTPSTRTSCH and PTPSTOPSCH bits are actually readable and indicate
whether the time-aware scheduler is running or not. We will be using
that for monitoring the scheduler in the next patch, so refactor the PTP
command API in order to allow that.
Signed-off-by: default avatarVladimir Oltean <olteanv@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      41603d78
  3. 13 Nov, 2019 35 commits
  5. 12 Nov, 2019 1 commit
    • David S. Miller's avatar
      Merge tag 'linux-can-next-for-5.5-20191111' of... · e0580b50
      David S. Miller authored 
      Merge tag 'linux-can-next-for-5.5-20191111' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
pull-request: can-next 2019-10-07

this is a pull request for net-next/master consisting of 32 patches.

The first patch is by Gustavo A. R. Silva and removes unused code in the
generic CAN infrastructure.

The next three patches target the mcp251x driver. The one by Andy
Shevchenko removes the legacy platform data support from the driver. The
other two are by Timo Schlüßler and reset the device only when needed,
to prevent glitches on the output when GPIO support is added.

I'm contributing two patches fixing checkpatch warnings in the
c_can_platform and peak_canfd driver.

Stephane Grosjean's patch for the peak_canfd driver adds hw timestamps
support in rx skbs.

The next three patches target the xilinx_can driver. One patch by me to
fix checkpatch warnings, one patch by Anssi Hannula to avoid non
requested bus error frames, and a patch by YueHaibing that switches the
driver to devm_platform_ioremap_resource().

Pankaj Sharma contributes two patches for the m_can driver, the first
one adds support for one shot mode, the other support for handling
arbitration errors.

Followed by four patches by YueHaibing, switching the grcan, ifi, rcar,
and sun4i drivers to devm_platform_ioremap_resource()

I'm contributing cleanup patches for the rx-offload helper, while Joakim
Zhang's patch prepares the rx-offload helper for CAN-FD support. The rx
offload users flexcan and ti_hecc are converted accordingly.

The remaining twelve patches target the flexcan driver. First Joakim
Zhang switches the driver to devm_platform_ioremap_resource(). The
remaining eleven patch are by me and clean up the abstract the access of
the iflag1 and iflag2 register both for RX and TX mailboxes. This is a
preparation for the upcoming CAN-FD support.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e0580b50
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