Add PTP IEEE-1588 support and make accesible via the PHC subsystem. v2: make e1000e_ptp_clock_info a static const struct per Stephen Hemminger Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Bruce Allan <bruce.w.allan@intel.com> Reviewed-by: Jacob Keller <Jacob.e.keller@intel.com> Acked-by: Richard Cochran <richardcochran@gmail.com> Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>tirimbino
Bruce Allan
12 years ago
committed by
Jeff Kirsher
parent
347b5201cb
commit
d89777bf0e
@ -0,0 +1,276 @@ |
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/*******************************************************************************
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Intel PRO/1000 Linux driver |
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Copyright(c) 1999 - 2012 Intel Corporation. |
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This program is free software; you can redistribute it and/or modify it |
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under the terms and conditions of the GNU General Public License, |
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version 2, as published by the Free Software Foundation. |
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This program is distributed in the hope it will be useful, but WITHOUT |
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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more details. |
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You should have received a copy of the GNU General Public License along with |
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this program; if not, write to the Free Software Foundation, Inc., |
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51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
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The full GNU General Public License is included in this distribution in |
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the file called "COPYING". |
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Contact Information: |
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Linux NICS <linux.nics@intel.com> |
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e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> |
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Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
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*******************************************************************************/ |
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/* PTP 1588 Hardware Clock (PHC)
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* Derived from PTP Hardware Clock driver for Intel 82576 and 82580 (igb) |
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* Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com> |
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*/ |
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#include "e1000.h" |
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/**
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* e1000e_phc_adjfreq - adjust the frequency of the hardware clock |
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* @ptp: ptp clock structure |
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* @delta: Desired frequency change in parts per billion |
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* |
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* Adjust the frequency of the PHC cycle counter by the indicated delta from |
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* the base frequency. |
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**/ |
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static int e1000e_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) |
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{ |
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struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter, |
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ptp_clock_info); |
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struct e1000_hw *hw = &adapter->hw; |
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bool neg_adj = false; |
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u64 adjustment; |
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u32 timinca, incvalue; |
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s32 ret_val; |
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if ((delta > ptp->max_adj) || (delta <= -1000000000)) |
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return -EINVAL; |
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if (delta < 0) { |
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neg_adj = true; |
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delta = -delta; |
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} |
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/* Get the System Time Register SYSTIM base frequency */ |
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ret_val = e1000e_get_base_timinca(adapter, &timinca); |
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if (ret_val) |
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return ret_val; |
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incvalue = timinca & E1000_TIMINCA_INCVALUE_MASK; |
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adjustment = incvalue; |
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adjustment *= delta; |
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adjustment = div_u64(adjustment, 1000000000); |
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incvalue = neg_adj ? (incvalue - adjustment) : (incvalue + adjustment); |
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timinca &= ~E1000_TIMINCA_INCVALUE_MASK; |
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timinca |= incvalue; |
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ew32(TIMINCA, timinca); |
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return 0; |
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} |
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/**
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* e1000e_phc_adjtime - Shift the time of the hardware clock |
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* @ptp: ptp clock structure |
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* @delta: Desired change in nanoseconds |
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* |
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* Adjust the timer by resetting the timecounter structure. |
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**/ |
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static int e1000e_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) |
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{ |
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struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter, |
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ptp_clock_info); |
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unsigned long flags; |
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s64 now; |
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spin_lock_irqsave(&adapter->systim_lock, flags); |
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now = timecounter_read(&adapter->tc); |
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now += delta; |
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timecounter_init(&adapter->tc, &adapter->cc, now); |
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spin_unlock_irqrestore(&adapter->systim_lock, flags); |
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return 0; |
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} |
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/**
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* e1000e_phc_gettime - Reads the current time from the hardware clock |
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* @ptp: ptp clock structure |
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* @ts: timespec structure to hold the current time value |
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* |
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* Read the timecounter and return the correct value in ns after converting |
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* it into a struct timespec. |
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**/ |
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static int e1000e_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts) |
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{ |
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struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter, |
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ptp_clock_info); |
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unsigned long flags; |
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u32 remainder; |
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u64 ns; |
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spin_lock_irqsave(&adapter->systim_lock, flags); |
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ns = timecounter_read(&adapter->tc); |
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spin_unlock_irqrestore(&adapter->systim_lock, flags); |
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ts->tv_sec = div_u64_rem(ns, NSEC_PER_SEC, &remainder); |
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ts->tv_nsec = remainder; |
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return 0; |
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} |
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/**
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* e1000e_phc_settime - Set the current time on the hardware clock |
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* @ptp: ptp clock structure |
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* @ts: timespec containing the new time for the cycle counter |
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* |
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* Reset the timecounter to use a new base value instead of the kernel |
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* wall timer value. |
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**/ |
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static int e1000e_phc_settime(struct ptp_clock_info *ptp, |
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const struct timespec *ts) |
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{ |
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struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter, |
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ptp_clock_info); |
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unsigned long flags; |
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u64 ns; |
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ns = ts->tv_sec * NSEC_PER_SEC; |
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ns += ts->tv_nsec; |
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/* reset the timecounter */ |
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spin_lock_irqsave(&adapter->systim_lock, flags); |
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timecounter_init(&adapter->tc, &adapter->cc, ns); |
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spin_unlock_irqrestore(&adapter->systim_lock, flags); |
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return 0; |
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} |
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/**
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* e1000e_phc_enable - enable or disable an ancillary feature |
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* @ptp: ptp clock structure |
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* @request: Desired resource to enable or disable |
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* @on: Caller passes one to enable or zero to disable |
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* |
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* Enable (or disable) ancillary features of the PHC subsystem. |
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* Currently, no ancillary features are supported. |
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**/ |
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static int e1000e_phc_enable(struct ptp_clock_info *ptp, |
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struct ptp_clock_request *request, int on) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static void e1000e_systim_overflow_work(struct work_struct *work) |
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{ |
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struct e1000_adapter *adapter = container_of(work, struct e1000_adapter, |
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systim_overflow_work.work); |
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struct e1000_hw *hw = &adapter->hw; |
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struct timespec ts; |
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adapter->ptp_clock_info.gettime(&adapter->ptp_clock_info, &ts); |
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e_dbg("SYSTIM overflow check at %ld.%09lu\n", ts.tv_sec, ts.tv_nsec); |
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schedule_delayed_work(&adapter->systim_overflow_work, |
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E1000_SYSTIM_OVERFLOW_PERIOD); |
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} |
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static const struct ptp_clock_info e1000e_ptp_clock_info = { |
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.owner = THIS_MODULE, |
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.n_alarm = 0, |
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.n_ext_ts = 0, |
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.n_per_out = 0, |
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.pps = 0, |
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.adjfreq = e1000e_phc_adjfreq, |
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.adjtime = e1000e_phc_adjtime, |
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.gettime = e1000e_phc_gettime, |
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.settime = e1000e_phc_settime, |
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.enable = e1000e_phc_enable, |
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}; |
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/**
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* e1000e_ptp_init - initialize PTP for devices which support it |
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* @adapter: board private structure |
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* |
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* This function performs the required steps for enabling PTP support. |
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* If PTP support has already been loaded it simply calls the cyclecounter |
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* init routine and exits. |
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**/ |
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void e1000e_ptp_init(struct e1000_adapter *adapter) |
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{ |
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struct e1000_hw *hw = &adapter->hw; |
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adapter->ptp_clock = NULL; |
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if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP)) |
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return; |
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adapter->ptp_clock_info = e1000e_ptp_clock_info; |
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snprintf(adapter->ptp_clock_info.name, |
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sizeof(adapter->ptp_clock_info.name), "%pm", |
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adapter->netdev->perm_addr); |
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switch (hw->mac.type) { |
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case e1000_pch2lan: |
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case e1000_pch_lpt: |
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if ((hw->mac.type != e1000_pch_lpt) || |
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(er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI)) { |
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adapter->ptp_clock_info.max_adj = 24000000 - 1; |
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break; |
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} |
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/* fall-through */ |
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case e1000_82574: |
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case e1000_82583: |
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adapter->ptp_clock_info.max_adj = 600000000 - 1; |
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break; |
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default: |
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break; |
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} |
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INIT_DELAYED_WORK(&adapter->systim_overflow_work, |
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e1000e_systim_overflow_work); |
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schedule_delayed_work(&adapter->systim_overflow_work, |
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E1000_SYSTIM_OVERFLOW_PERIOD); |
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adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info, |
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&adapter->pdev->dev); |
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if (IS_ERR(adapter->ptp_clock)) { |
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adapter->ptp_clock = NULL; |
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e_err("ptp_clock_register failed\n"); |
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} else { |
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e_info("registered PHC clock\n"); |
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} |
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} |
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/**
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* e1000e_ptp_remove - disable PTP device and stop the overflow check |
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* @adapter: board private structure |
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* |
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* Stop the PTP support, and cancel the delayed work. |
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**/ |
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void e1000e_ptp_remove(struct e1000_adapter *adapter) |
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{ |
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if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP)) |
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return; |
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cancel_delayed_work_sync(&adapter->systim_overflow_work); |
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if (adapter->ptp_clock) { |
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ptp_clock_unregister(adapter->ptp_clock); |
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adapter->ptp_clock = NULL; |
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e_info("removed PHC\n"); |
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} |
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} |
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