e1000e: add support for IEEE-1588 PTP
authorBruce Allan <bruce.w.allan@intel.com>
Sat, 19 Jan 2013 01:09:58 +0000 (01:09 +0000)
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>
Sun, 27 Jan 2013 08:36:35 +0000 (00:36 -0800)
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>
drivers/net/ethernet/intel/Kconfig
drivers/net/ethernet/intel/e1000e/Makefile
drivers/net/ethernet/intel/e1000e/defines.h
drivers/net/ethernet/intel/e1000e/e1000.h
drivers/net/ethernet/intel/e1000e/ethtool.c
drivers/net/ethernet/intel/e1000e/hw.h
drivers/net/ethernet/intel/e1000e/netdev.c
drivers/net/ethernet/intel/e1000e/ptp.c [new file with mode: 0644]

index 21353f0fef63ecf99384455a90b33399e43185e6..3d5f6d463757ff06d95a88d6fe13b22ec2ff7788 100644 (file)
@@ -74,6 +74,7 @@ config E1000E
        tristate "Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support"
        depends on PCI && (!SPARC32 || BROKEN)
        select CRC32
+       select PTP_1588_CLOCK
        ---help---
          This driver supports the PCI-Express Intel(R) PRO/1000 gigabit
          ethernet family of adapters. For PCI or PCI-X e1000 adapters,
index 591b713245057fc4b2ae2fccf797665090ef972c..1da0faac0411753caf35a1f10b0160f2c12a5485 100644 (file)
@@ -34,5 +34,5 @@ obj-$(CONFIG_E1000E) += e1000e.o
 
 e1000e-objs := 82571.o ich8lan.o 80003es2lan.o \
               mac.o manage.o nvm.o phy.o \
-              param.o ethtool.o netdev.o
+              param.o ethtool.o netdev.o ptp.o
 
index 36f9fad19a7649cb0d5a919219fcef631c8b1e96..5cb7441dca2af674e9272d11ed2f4a8fd7296bf9 100644 (file)
 
 #define E1000_TSYNCRXCTL_VALID         0x00000001 /* Rx timestamp valid */
 #define E1000_TSYNCRXCTL_TYPE_MASK     0x0000000E /* Rx type mask */
+#define E1000_TSYNCRXCTL_TYPE_L2_V2    0x00
+#define E1000_TSYNCRXCTL_TYPE_L4_V1    0x02
+#define E1000_TSYNCRXCTL_TYPE_L2_L4_V2 0x04
+#define E1000_TSYNCRXCTL_TYPE_ALL      0x08
+#define E1000_TSYNCRXCTL_TYPE_EVENT_V2 0x0A
 #define E1000_TSYNCRXCTL_ENABLED       0x00000010 /* enable Rx timestamping */
 #define E1000_TSYNCRXCTL_SYSCFI                0x00000020 /* Sys clock frequency */
 
+#define E1000_RXMTRL_PTP_V1_SYNC_MESSAGE       0x00000000
+#define E1000_RXMTRL_PTP_V1_DELAY_REQ_MESSAGE  0x00010000
+
+#define E1000_RXMTRL_PTP_V2_SYNC_MESSAGE       0x00000000
+#define E1000_RXMTRL_PTP_V2_DELAY_REQ_MESSAGE  0x01000000
+
 #define E1000_TIMINCA_INCPERIOD_SHIFT  24
 #define E1000_TIMINCA_INCVALUE_MASK    0x00FFFFFF
 
index dea9e5552966868de6bed6c28cedac656d9dfc04..bd5876171376c10cebd1cd4e36cb8257b891b562 100644 (file)
@@ -43,7 +43,8 @@
 #include <linux/if_vlan.h>
 #include <linux/clocksource.h>
 #include <linux/net_tstamp.h>
-
+#include <linux/ptp_clock_kernel.h>
+#include <linux/ptp_classify.h>
 #include "hw.h"
 
 struct e1000_info;
@@ -413,6 +414,8 @@ struct e1000_adapter {
        spinlock_t systim_lock; /* protects SYSTIML/H regsters */
        struct cyclecounter cc;
        struct timecounter tc;
+       struct ptp_clock *ptp_clock;
+       struct ptp_clock_info ptp_clock_info;
 };
 
 struct e1000_info {
@@ -427,6 +430,8 @@ struct e1000_info {
        const struct e1000_nvm_operations *nvm_ops;
 };
 
+s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca);
+
 /* The system time is maintained by a 64-bit counter comprised of the 32-bit
  * SYSTIMH and SYSTIML registers.  How the counter increments (and therefore
  * its resolution) is based on the contents of the TIMINCA register - it
@@ -704,6 +709,8 @@ extern s32 e1000_phy_force_speed_duplex_ife(struct e1000_hw *hw);
 extern s32 e1000_check_polarity_igp(struct e1000_hw *hw);
 extern bool e1000_check_phy_82574(struct e1000_hw *hw);
 extern s32 e1000_read_emi_reg_locked(struct e1000_hw *hw, u16 addr, u16 *data);
+extern void e1000e_ptp_init(struct e1000_adapter *adapter);
+extern void e1000e_ptp_remove(struct e1000_adapter *adapter);
 
 static inline s32 e1000_phy_hw_reset(struct e1000_hw *hw)
 {
index ceff1bf300b395f5ef14ce21388ba14834daaac8..e3855bb10599beb17432d3c3ef83c1bd0e74dcfb 100644 (file)
@@ -2209,8 +2209,20 @@ static int e1000e_get_ts_info(struct net_device *netdev,
        info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);
 
        info->rx_filters = ((1 << HWTSTAMP_FILTER_NONE) |
+                           (1 << HWTSTAMP_FILTER_PTP_V1_L4_SYNC) |
+                           (1 << HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ) |
+                           (1 << HWTSTAMP_FILTER_PTP_V2_L4_SYNC) |
+                           (1 << HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ) |
+                           (1 << HWTSTAMP_FILTER_PTP_V2_L2_SYNC) |
+                           (1 << HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ) |
+                           (1 << HWTSTAMP_FILTER_PTP_V2_EVENT) |
+                           (1 << HWTSTAMP_FILTER_PTP_V2_SYNC) |
+                           (1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ) |
                            (1 << HWTSTAMP_FILTER_ALL));
 
+       if (adapter->ptp_clock)
+               info->phc_index = ptp_clock_index(adapter->ptp_clock);
+
        return 0;
 }
 
index 8e7e80345a601534c33129a24d85566a2128b34a..84e6beb78718a93a2ed3c68f677c55efef005dfe 100644 (file)
@@ -251,6 +251,8 @@ enum e1e_registers {
        E1000_TSYNCRXCTL = 0x0B620, /* Rx Time Sync Control register - RW */
        E1000_RXSTMPL   = 0x0B624, /* Rx timestamp Low - RO */
        E1000_RXSTMPH   = 0x0B628, /* Rx timestamp High - RO */
+       E1000_RXMTRL    = 0x0B634, /* Timesync Rx EtherType and Msg Type - RW */
+       E1000_RXUDP     = 0x0B638, /* Timesync Rx UDP Port - RW */
 };
 
 #define E1000_MAX_PHY_ADDR             4
index 8bb5d28eca1474a24c7a30e09b8542345dfe8052..34be756ee1e2b15097800021be34738f40bb38d6 100644 (file)
@@ -3413,7 +3413,7 @@ static void e1000e_setup_rss_hash(struct e1000_adapter *adapter)
  * Get attributes for incrementing the System Time Register SYSTIML/H at
  * the default base frequency, and set the cyclecounter shift value.
  **/
-static s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca)
+s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca)
 {
        struct e1000_hw *hw = &adapter->hw;
        u32 incvalue, incperiod, shift;
@@ -3485,6 +3485,10 @@ static int e1000e_config_hwtstamp(struct e1000_adapter *adapter)
        struct hwtstamp_config *config = &adapter->hwtstamp_config;
        u32 tsync_tx_ctl = E1000_TSYNCTXCTL_ENABLED;
        u32 tsync_rx_ctl = E1000_TSYNCRXCTL_ENABLED;
+       u32 rxmtrl = 0;
+       u16 rxudp = 0;
+       bool is_l4 = false;
+       bool is_l2 = false;
        u32 regval;
        s32 ret_val;
 
@@ -3509,7 +3513,69 @@ static int e1000e_config_hwtstamp(struct e1000_adapter *adapter)
        case HWTSTAMP_FILTER_NONE:
                tsync_rx_ctl = 0;
                break;
+       case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+               tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L4_V1;
+               rxmtrl = E1000_RXMTRL_PTP_V1_SYNC_MESSAGE;
+               is_l4 = true;
+               break;
+       case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+               tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L4_V1;
+               rxmtrl = E1000_RXMTRL_PTP_V1_DELAY_REQ_MESSAGE;
+               is_l4 = true;
+               break;
+       case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+               /* Also time stamps V2 L2 Path Delay Request/Response */
+               tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L2_V2;
+               rxmtrl = E1000_RXMTRL_PTP_V2_SYNC_MESSAGE;
+               is_l2 = true;
+               break;
+       case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+               /* Also time stamps V2 L2 Path Delay Request/Response. */
+               tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L2_V2;
+               rxmtrl = E1000_RXMTRL_PTP_V2_DELAY_REQ_MESSAGE;
+               is_l2 = true;
+               break;
+       case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+               /* Hardware cannot filter just V2 L4 Sync messages;
+                * fall-through to V2 (both L2 and L4) Sync.
+                */
+       case HWTSTAMP_FILTER_PTP_V2_SYNC:
+               /* Also time stamps V2 Path Delay Request/Response. */
+               tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L2_L4_V2;
+               rxmtrl = E1000_RXMTRL_PTP_V2_SYNC_MESSAGE;
+               is_l2 = true;
+               is_l4 = true;
+               break;
+       case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+               /* Hardware cannot filter just V2 L4 Delay Request messages;
+                * fall-through to V2 (both L2 and L4) Delay Request.
+                */
+       case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+               /* Also time stamps V2 Path Delay Request/Response. */
+               tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L2_L4_V2;
+               rxmtrl = E1000_RXMTRL_PTP_V2_DELAY_REQ_MESSAGE;
+               is_l2 = true;
+               is_l4 = true;
+               break;
+       case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+       case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+               /* Hardware cannot filter just V2 L4 or L2 Event messages;
+                * fall-through to all V2 (both L2 and L4) Events.
+                */
+       case HWTSTAMP_FILTER_PTP_V2_EVENT:
+               tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_EVENT_V2;
+               config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
+               is_l2 = true;
+               is_l4 = true;
+               break;
+       case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+               /* For V1, the hardware can only filter Sync messages or
+                * Delay Request messages but not both so fall-through to
+                * time stamp all packets.
+                */
        case HWTSTAMP_FILTER_ALL:
+               is_l2 = true;
+               is_l4 = true;
                tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_ALL;
                config->rx_filter = HWTSTAMP_FILTER_ALL;
                break;
@@ -3541,6 +3607,22 @@ static int e1000e_config_hwtstamp(struct e1000_adapter *adapter)
                return -EAGAIN;
        }
 
+       /* L2: define ethertype filter for time stamped packets */
+       if (is_l2)
+               rxmtrl |= ETH_P_1588;
+
+       /* define which PTP packets get time stamped */
+       ew32(RXMTRL, rxmtrl);
+
+       /* Filter by destination port */
+       if (is_l4) {
+               rxudp = PTP_EV_PORT;
+               cpu_to_be16s(&rxudp);
+       }
+       ew32(RXUDP, rxudp);
+
+       e1e_flush();
+
        /* Clear TSYNCRXCTL_VALID & TSYNCTXCTL_VALID bit */
        regval = er32(RXSTMPH);
        regval = er32(TXSTMPH);
@@ -5665,6 +5747,24 @@ static int e1000e_hwtstamp_ioctl(struct net_device *netdev, struct ifreq *ifr)
 
        config = adapter->hwtstamp_config;
 
+       switch (config.rx_filter) {
+       case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+       case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+       case HWTSTAMP_FILTER_PTP_V2_SYNC:
+       case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+       case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+       case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+               /* With V2 type filters which specify a Sync or Delay Request,
+                * Path Delay Request/Response messages are also time stamped
+                * by hardware so notify the caller the requested packets plus
+                * some others are time stamped.
+                */
+               config.rx_filter = HWTSTAMP_FILTER_SOME;
+               break;
+       default:
+               break;
+       }
+
        return copy_to_user(ifr->ifr_data, &config,
                            sizeof(config)) ? -EFAULT : 0;
 }
@@ -6672,6 +6772,9 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
        /* carrier off reporting is important to ethtool even BEFORE open */
        netif_carrier_off(netdev);
 
+       /* init PTP hardware clock */
+       e1000e_ptp_init(adapter);
+
        e1000_print_device_info(adapter);
 
        if (pci_dev_run_wake(pdev))
@@ -6720,6 +6823,8 @@ static void e1000_remove(struct pci_dev *pdev)
        struct e1000_adapter *adapter = netdev_priv(netdev);
        bool down = test_bit(__E1000_DOWN, &adapter->state);
 
+       e1000e_ptp_remove(adapter);
+
        /* The timers may be rescheduled, so explicitly disable them
         * from being rescheduled.
         */
diff --git a/drivers/net/ethernet/intel/e1000e/ptp.c b/drivers/net/ethernet/intel/e1000e/ptp.c
new file mode 100644 (file)
index 0000000..32da00c
--- /dev/null
@@ -0,0 +1,276 @@
+/*******************************************************************************
+
+  Intel PRO/1000 Linux driver
+  Copyright(c) 1999 - 2012 Intel Corporation.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope 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.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Contact Information:
+  Linux NICS <linux.nics@intel.com>
+  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+/* PTP 1588 Hardware Clock (PHC)
+ * Derived from PTP Hardware Clock driver for Intel 82576 and 82580 (igb)
+ * Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
+ */
+
+#include "e1000.h"
+
+/**
+ * e1000e_phc_adjfreq - adjust the frequency of the hardware clock
+ * @ptp: ptp clock structure
+ * @delta: Desired frequency change in parts per billion
+ *
+ * Adjust the frequency of the PHC cycle counter by the indicated delta from
+ * the base frequency.
+ **/
+static int e1000e_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta)
+{
+       struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,
+                                                    ptp_clock_info);
+       struct e1000_hw *hw = &adapter->hw;
+       bool neg_adj = false;
+       u64 adjustment;
+       u32 timinca, incvalue;
+       s32 ret_val;
+
+       if ((delta > ptp->max_adj) || (delta <= -1000000000))
+               return -EINVAL;
+
+       if (delta < 0) {
+               neg_adj = true;
+               delta = -delta;
+       }
+
+       /* Get the System Time Register SYSTIM base frequency */
+       ret_val = e1000e_get_base_timinca(adapter, &timinca);
+       if (ret_val)
+               return ret_val;
+
+       incvalue = timinca & E1000_TIMINCA_INCVALUE_MASK;
+
+       adjustment = incvalue;
+       adjustment *= delta;
+       adjustment = div_u64(adjustment, 1000000000);
+
+       incvalue = neg_adj ? (incvalue - adjustment) : (incvalue + adjustment);
+
+       timinca &= ~E1000_TIMINCA_INCVALUE_MASK;
+       timinca |= incvalue;
+
+       ew32(TIMINCA, timinca);
+
+       return 0;
+}
+
+/**
+ * e1000e_phc_adjtime - Shift the time of the hardware clock
+ * @ptp: ptp clock structure
+ * @delta: Desired change in nanoseconds
+ *
+ * Adjust the timer by resetting the timecounter structure.
+ **/
+static int e1000e_phc_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+       struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,
+                                                    ptp_clock_info);
+       unsigned long flags;
+       s64 now;
+
+       spin_lock_irqsave(&adapter->systim_lock, flags);
+       now = timecounter_read(&adapter->tc);
+       now += delta;
+       timecounter_init(&adapter->tc, &adapter->cc, now);
+       spin_unlock_irqrestore(&adapter->systim_lock, flags);
+
+       return 0;
+}
+
+/**
+ * e1000e_phc_gettime - Reads the current time from the hardware clock
+ * @ptp: ptp clock structure
+ * @ts: timespec structure to hold the current time value
+ *
+ * Read the timecounter and return the correct value in ns after converting
+ * it into a struct timespec.
+ **/
+static int e1000e_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
+{
+       struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,
+                                                    ptp_clock_info);
+       unsigned long flags;
+       u32 remainder;
+       u64 ns;
+
+       spin_lock_irqsave(&adapter->systim_lock, flags);
+       ns = timecounter_read(&adapter->tc);
+       spin_unlock_irqrestore(&adapter->systim_lock, flags);
+
+       ts->tv_sec = div_u64_rem(ns, NSEC_PER_SEC, &remainder);
+       ts->tv_nsec = remainder;
+
+       return 0;
+}
+
+/**
+ * e1000e_phc_settime - Set the current time on the hardware clock
+ * @ptp: ptp clock structure
+ * @ts: timespec containing the new time for the cycle counter
+ *
+ * Reset the timecounter to use a new base value instead of the kernel
+ * wall timer value.
+ **/
+static int e1000e_phc_settime(struct ptp_clock_info *ptp,
+                             const struct timespec *ts)
+{
+       struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,
+                                                    ptp_clock_info);
+       unsigned long flags;
+       u64 ns;
+
+       ns = ts->tv_sec * NSEC_PER_SEC;
+       ns += ts->tv_nsec;
+
+       /* reset the timecounter */
+       spin_lock_irqsave(&adapter->systim_lock, flags);
+       timecounter_init(&adapter->tc, &adapter->cc, ns);
+       spin_unlock_irqrestore(&adapter->systim_lock, flags);
+
+       return 0;
+}
+
+/**
+ * e1000e_phc_enable - enable or disable an ancillary feature
+ * @ptp: ptp clock structure
+ * @request: Desired resource to enable or disable
+ * @on: Caller passes one to enable or zero to disable
+ *
+ * Enable (or disable) ancillary features of the PHC subsystem.
+ * Currently, no ancillary features are supported.
+ **/
+static int e1000e_phc_enable(struct ptp_clock_info *ptp,
+                            struct ptp_clock_request *request, int on)
+{
+       return -EOPNOTSUPP;
+}
+
+static void e1000e_systim_overflow_work(struct work_struct *work)
+{
+       struct e1000_adapter *adapter = container_of(work, struct e1000_adapter,
+                                                    systim_overflow_work.work);
+       struct e1000_hw *hw = &adapter->hw;
+       struct timespec ts;
+
+       adapter->ptp_clock_info.gettime(&adapter->ptp_clock_info, &ts);
+
+       e_dbg("SYSTIM overflow check at %ld.%09lu\n", ts.tv_sec, ts.tv_nsec);
+
+       schedule_delayed_work(&adapter->systim_overflow_work,
+                             E1000_SYSTIM_OVERFLOW_PERIOD);
+}
+
+static const struct ptp_clock_info e1000e_ptp_clock_info = {
+       .owner          = THIS_MODULE,
+       .n_alarm        = 0,
+       .n_ext_ts       = 0,
+       .n_per_out      = 0,
+       .pps            = 0,
+       .adjfreq        = e1000e_phc_adjfreq,
+       .adjtime        = e1000e_phc_adjtime,
+       .gettime        = e1000e_phc_gettime,
+       .settime        = e1000e_phc_settime,
+       .enable         = e1000e_phc_enable,
+};
+
+/**
+ * e1000e_ptp_init - initialize PTP for devices which support it
+ * @adapter: board private structure
+ *
+ * This function performs the required steps for enabling PTP support.
+ * If PTP support has already been loaded it simply calls the cyclecounter
+ * init routine and exits.
+ **/
+void e1000e_ptp_init(struct e1000_adapter *adapter)
+{
+       struct e1000_hw *hw = &adapter->hw;
+
+       adapter->ptp_clock = NULL;
+
+       if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP))
+               return;
+
+       adapter->ptp_clock_info = e1000e_ptp_clock_info;
+
+       snprintf(adapter->ptp_clock_info.name,
+                sizeof(adapter->ptp_clock_info.name), "%pm",
+                adapter->netdev->perm_addr);
+
+       switch (hw->mac.type) {
+       case e1000_pch2lan:
+       case e1000_pch_lpt:
+               if ((hw->mac.type != e1000_pch_lpt) ||
+                   (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI)) {
+                       adapter->ptp_clock_info.max_adj = 24000000 - 1;
+                       break;
+               }
+               /* fall-through */
+       case e1000_82574:
+       case e1000_82583:
+               adapter->ptp_clock_info.max_adj = 600000000 - 1;
+               break;
+       default:
+               break;
+       }
+
+       INIT_DELAYED_WORK(&adapter->systim_overflow_work,
+                         e1000e_systim_overflow_work);
+
+       schedule_delayed_work(&adapter->systim_overflow_work,
+                             E1000_SYSTIM_OVERFLOW_PERIOD);
+
+       adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info,
+                                               &adapter->pdev->dev);
+       if (IS_ERR(adapter->ptp_clock)) {
+               adapter->ptp_clock = NULL;
+               e_err("ptp_clock_register failed\n");
+       } else {
+               e_info("registered PHC clock\n");
+       }
+}
+
+/**
+ * e1000e_ptp_remove - disable PTP device and stop the overflow check
+ * @adapter: board private structure
+ *
+ * Stop the PTP support, and cancel the delayed work.
+ **/
+void e1000e_ptp_remove(struct e1000_adapter *adapter)
+{
+       if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP))
+               return;
+
+       cancel_delayed_work_sync(&adapter->systim_overflow_work);
+
+       if (adapter->ptp_clock) {
+               ptp_clock_unregister(adapter->ptp_clock);
+               adapter->ptp_clock = NULL;
+               e_info("removed PHC\n");
+       }
+}