1 files changed, 343 insertions, 108 deletions

diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c
index 7e892b1cbd3d..4b7bad9a485d 100644
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -7,32 +7,30 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/ptrace.h>
-#include <linux/errno.h>
-#include <linux/ioport.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/pci.h>
+#include <linux/bitops.h>
+#include <linux/clk.h>
 #include <linux/delay.h>
-#include <linux/netdevice.h>
+#include <linux/errno.h>
 #include <linux/etherdevice.h>
-#include <linux/skbuff.h>
-#include <linux/spinlock.h>
-#include <linux/workqueue.h>
-#include <linux/bitops.h>
+#include <linux/fec.h>
+#include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/ioport.h>
 #include <linux/irq.h>
-#include <linux/clk.h>
-#include <linux/platform_device.h>
-#include <linux/phy.h>
-#include <linux/fec.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
 #include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/of_gpio.h>
 #include <linux/of_net.h>
+#include <linux/pci.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/ptrace.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/workqueue.h>
 
 #include "fec.h"
 
@@ -85,15 +83,41 @@
 #define FEC_CC_MULT	(1 << 31)
 #define FEC_COUNTER_PERIOD	(1 << 31)
 #define PPS_OUPUT_RELOAD_PERIOD	NSEC_PER_SEC
-#define FEC_CHANNLE_0		0
-#define DEFAULT_PPS_CHANNEL	FEC_CHANNLE_0
+#define DEFAULT_PPS_CHANNEL	0
+
+#define FEC_PTP_MAX_NSEC_PERIOD		4000000000ULL
+#define FEC_PTP_MAX_NSEC_COUNTER	0x80000000ULL
+
+/**
+ * fec_ptp_read - read raw cycle counter (to be used by time counter)
+ * @cc: the cyclecounter structure
+ *
+ * this function reads the cyclecounter registers and is called by the
+ * cyclecounter structure used to construct a ns counter from the
+ * arbitrary fixed point registers
+ */
+static u64 fec_ptp_read(struct cyclecounter *cc)
+{
+	struct fec_enet_private *fep =
+		container_of(cc, struct fec_enet_private, cc);
+	u32 tempval;
+
+	tempval = readl(fep->hwp + FEC_ATIME_CTRL);
+	tempval |= FEC_T_CTRL_CAPTURE;
+	writel(tempval, fep->hwp + FEC_ATIME_CTRL);
+
+	if (fep->quirks & FEC_QUIRK_BUG_CAPTURE)
+		udelay(1);
+
+	return readl(fep->hwp + FEC_ATIME);
+}
 
 /**
  * fec_ptp_enable_pps
  * @fep: the fec_enet_private structure handle
  * @enable: enable the channel pps output
  *
- * This function enble the PPS ouput on the timer channel.
+ * This function enables the PPS output on the timer channel.
  */
 static int fec_ptp_enable_pps(struct fec_enet_private *fep, uint enable)
 {
@@ -101,20 +125,19 @@ static int fec_ptp_enable_pps(struct fec_enet_private *fep, uint enable)
 	u32 val, tempval;
 	struct timespec64 ts;
 	u64 ns;
-	val = 0;
 
-	if (!(fep->hwts_tx_en || fep->hwts_rx_en)) {
-		dev_err(&fep->pdev->dev, "No ptp stack is running\n");
-		return -EINVAL;
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+
+	if (fep->perout_enable) {
+		spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+		dev_err(&fep->pdev->dev, "PEROUT is running");
+		return -EBUSY;
 	}
 
-	if (fep->pps_enable == enable)
+	if (fep->pps_enable == enable) {
+		spin_unlock_irqrestore(&fep->tmreg_lock, flags);
 		return 0;
-
-	fep->pps_channel = DEFAULT_PPS_CHANNEL;
-	fep->reload_period = PPS_OUPUT_RELOAD_PERIOD;
-
-	spin_lock_irqsave(&fep->tmreg_lock, flags);
+	}
 
 	if (enable) {
 		/* clear capture or output compare interrupt status if have.
@@ -141,11 +164,7 @@ static int fec_ptp_enable_pps(struct fec_enet_private *fep, uint enable)
 		 * NSEC_PER_SEC - ts.tv_nsec. Add the remaining nanoseconds
 		 * to current timer would be next second.
 		 */
-		tempval = readl(fep->hwp + FEC_ATIME_CTRL);
-		tempval |= FEC_T_CTRL_CAPTURE;
-		writel(tempval, fep->hwp + FEC_ATIME_CTRL);
-
-		tempval = readl(fep->hwp + FEC_ATIME);
+		tempval = fec_ptp_read(&fep->cc);
 		/* Convert the ptp local counter to 1588 timestamp */
 		ns = timecounter_cyc2time(&fep->tc, tempval);
 		ts = ns_to_timespec64(ns);
@@ -159,7 +178,7 @@ static int fec_ptp_enable_pps(struct fec_enet_private *fep, uint enable)
 		 * very close to the second point, which means NSEC_PER_SEC
 		 * - ts.tv_nsec is close to be zero(For example 20ns); Since the timer
 		 * is still running when we calculate the first compare event, it is
-		 * possible that the remaining nanoseonds run out before the compare
+		 * possible that the remaining nanoseconds run out before the compare
 		 * counter is calculated and written into TCCR register. To avoid
 		 * this possibility, we will set the compare event to be the next
 		 * of next second. The current setting is 31-bit timer and wrap
@@ -208,30 +227,71 @@ static int fec_ptp_enable_pps(struct fec_enet_private *fep, uint enable)
 	return 0;
 }
 
-/**
- * fec_ptp_read - read raw cycle counter (to be used by time counter)
- * @cc: the cyclecounter structure
- *
- * this function reads the cyclecounter registers and is called by the
- * cyclecounter structure used to construct a ns counter from the
- * arbitrary fixed point registers
- */
-static u64 fec_ptp_read(const struct cyclecounter *cc)
+static int fec_ptp_pps_perout(struct fec_enet_private *fep)
 {
-	struct fec_enet_private *fep =
-		container_of(cc, struct fec_enet_private, cc);
-	const struct platform_device_id *id_entry =
-		platform_get_device_id(fep->pdev);
-	u32 tempval;
+	u32 compare_val, ptp_hc, temp_val;
+	u64 curr_time;
+	unsigned long flags;
 
-	tempval = readl(fep->hwp + FEC_ATIME_CTRL);
-	tempval |= FEC_T_CTRL_CAPTURE;
-	writel(tempval, fep->hwp + FEC_ATIME_CTRL);
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
 
-	if (id_entry->driver_data & FEC_QUIRK_BUG_CAPTURE)
-		udelay(1);
+	/* Update time counter */
+	timecounter_read(&fep->tc);
 
-	return readl(fep->hwp + FEC_ATIME);
+	/* Get the current ptp hardware time counter */
+	ptp_hc = fec_ptp_read(&fep->cc);
+
+	/* Convert the ptp local counter to 1588 timestamp */
+	curr_time = timecounter_cyc2time(&fep->tc, ptp_hc);
+
+	/* If the pps start time less than current time add 100ms, just return.
+	 * Because the software might not able to set the comparison time into
+	 * the FEC_TCCR register in time and missed the start time.
+	 */
+	if (fep->perout_stime < curr_time + 100 * NSEC_PER_MSEC) {
+		fep->perout_enable = false;
+		dev_err(&fep->pdev->dev, "Current time is too close to the start time!\n");
+		spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+		return -1;
+	}
+
+	compare_val = fep->perout_stime - curr_time + ptp_hc;
+	compare_val &= fep->cc.mask;
+
+	writel(compare_val, fep->hwp + FEC_TCCR(fep->pps_channel));
+	fep->next_counter = (compare_val + fep->reload_period) & fep->cc.mask;
+
+	/* Enable compare event when overflow */
+	temp_val = readl(fep->hwp + FEC_ATIME_CTRL);
+	temp_val |= FEC_T_CTRL_PINPER;
+	writel(temp_val, fep->hwp + FEC_ATIME_CTRL);
+
+	/* Compare channel setting. */
+	temp_val = readl(fep->hwp + FEC_TCSR(fep->pps_channel));
+	temp_val |= (1 << FEC_T_TF_OFFSET | 1 << FEC_T_TIE_OFFSET);
+	temp_val &= ~(1 << FEC_T_TDRE_OFFSET);
+	temp_val &= ~(FEC_T_TMODE_MASK);
+	temp_val |= (FEC_TMODE_TOGGLE << FEC_T_TMODE_OFFSET);
+	writel(temp_val, fep->hwp + FEC_TCSR(fep->pps_channel));
+
+	/* Write the second compare event timestamp and calculate
+	 * the third timestamp. Refer the TCCR register detail in the spec.
+	 */
+	writel(fep->next_counter, fep->hwp + FEC_TCCR(fep->pps_channel));
+	fep->next_counter = (fep->next_counter + fep->reload_period) & fep->cc.mask;
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+
+	return 0;
+}
+
+static enum hrtimer_restart fec_ptp_pps_perout_handler(struct hrtimer *timer)
+{
+	struct fec_enet_private *fep = container_of(timer,
+					struct fec_enet_private, perout_timer);
+
+	fec_ptp_pps_perout(fep);
+
+	return HRTIMER_NORESTART;
 }
 
 /**
@@ -269,24 +329,27 @@ void fec_ptp_start_cyclecounter(struct net_device *ndev)
 	fep->cc.mult = FEC_CC_MULT;
 
 	/* reset the ns time counter */
-	timecounter_init(&fep->tc, &fep->cc, ktime_to_ns(ktime_get_real()));
+	timecounter_init(&fep->tc, &fep->cc, 0);
 
 	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
 }
 
 /**
- * fec_ptp_adjfreq - adjust ptp cycle frequency
+ * fec_ptp_adjfine - adjust ptp cycle frequency
  * @ptp: the ptp clock structure
- * @ppb: parts per billion adjustment from base
+ * @scaled_ppm: scaled parts per million adjustment from base
  *
  * Adjust the frequency of the ptp cycle counter by the
- * indicated ppb from the base frequency.
+ * indicated amount from the base frequency.
+ *
+ * Scaled parts per million is ppm with a 16-bit binary fractional field.
  *
  * Because ENET hardware frequency adjust is complex,
  * using software method to do that.
  */
-static int fec_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+static int fec_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 {
+	s32 ppb = scaled_ppm_to_ppb(scaled_ppm);
 	unsigned long flags;
 	int neg_adj = 0;
 	u32 i, tmp;
@@ -377,14 +440,21 @@ static int fec_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
  */
 static int fec_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
 {
-	struct fec_enet_private *adapter =
+	struct fec_enet_private *fep =
 	    container_of(ptp, struct fec_enet_private, ptp_caps);
 	u64 ns;
 	unsigned long flags;
 
-	spin_lock_irqsave(&adapter->tmreg_lock, flags);
-	ns = timecounter_read(&adapter->tc);
-	spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+	mutex_lock(&fep->ptp_clk_mutex);
+	/* Check the ptp clock */
+	if (!fep->ptp_clk_on) {
+		mutex_unlock(&fep->ptp_clk_mutex);
+		return -EINVAL;
+	}
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+	ns = timecounter_read(&fep->tc);
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+	mutex_unlock(&fep->ptp_clk_mutex);
 
 	*ts = ns_to_timespec64(ns);
 
@@ -430,6 +500,20 @@ static int fec_ptp_settime(struct ptp_clock_info *ptp,
 	return 0;
 }
 
+static int fec_ptp_pps_disable(struct fec_enet_private *fep, uint channel)
+{
+	unsigned long flags;
+
+	hrtimer_cancel(&fep->perout_timer);
+
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+	fep->perout_enable = false;
+	writel(0, fep->hwp + FEC_TCSR(channel));
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+
+	return 0;
+}
+
 /**
  * fec_ptp_enable
  * @ptp: the ptp clock structure
@@ -442,30 +526,120 @@ static int fec_ptp_enable(struct ptp_clock_info *ptp,
 {
 	struct fec_enet_private *fep =
 	    container_of(ptp, struct fec_enet_private, ptp_caps);
+	ktime_t timeout;
+	struct timespec64 start_time, period;
+	u64 curr_time, delta, period_ns;
+	unsigned long flags;
 	int ret = 0;
 
 	if (rq->type == PTP_CLK_REQ_PPS) {
+		fep->reload_period = PPS_OUPUT_RELOAD_PERIOD;
+
 		ret = fec_ptp_enable_pps(fep, on);
 
 		return ret;
+	} else if (rq->type == PTP_CLK_REQ_PEROUT) {
+		u32 reload_period;
+
+		/* Reject requests with unsupported flags */
+		if (rq->perout.flags)
+			return -EOPNOTSUPP;
+
+		if (rq->perout.index != fep->pps_channel)
+			return -EOPNOTSUPP;
+
+		period.tv_sec = rq->perout.period.sec;
+		period.tv_nsec = rq->perout.period.nsec;
+		period_ns = timespec64_to_ns(&period);
+
+		/* FEC PTP timer only has 31 bits, so if the period exceed
+		 * 4s is not supported.
+		 */
+		if (period_ns > FEC_PTP_MAX_NSEC_PERIOD) {
+			dev_err(&fep->pdev->dev, "The period must equal to or less than 4s!\n");
+			return -EOPNOTSUPP;
+		}
+
+		reload_period = div_u64(period_ns, 2);
+		if (on && reload_period) {
+			u64 perout_stime;
+
+			/* Convert 1588 timestamp to ns*/
+			start_time.tv_sec = rq->perout.start.sec;
+			start_time.tv_nsec = rq->perout.start.nsec;
+			perout_stime = timespec64_to_ns(&start_time);
+
+			mutex_lock(&fep->ptp_clk_mutex);
+			if (!fep->ptp_clk_on) {
+				dev_err(&fep->pdev->dev, "Error: PTP clock is closed!\n");
+				mutex_unlock(&fep->ptp_clk_mutex);
+				return -EOPNOTSUPP;
+			}
+			spin_lock_irqsave(&fep->tmreg_lock, flags);
+
+			if (fep->pps_enable) {
+				dev_err(&fep->pdev->dev, "PPS is running");
+				ret = -EBUSY;
+				goto unlock;
+			}
+
+			if (fep->perout_enable) {
+				dev_err(&fep->pdev->dev,
+					"PEROUT has been enabled\n");
+				ret = -EBUSY;
+				goto unlock;
+			}
+
+			/* Read current timestamp */
+			curr_time = timecounter_read(&fep->tc);
+			if (perout_stime <= curr_time) {
+				dev_err(&fep->pdev->dev,
+					"Start time must be greater than current time\n");
+				ret = -EINVAL;
+				goto unlock;
+			}
+
+			/* Calculate time difference */
+			delta = perout_stime - curr_time;
+			fep->reload_period = reload_period;
+			fep->perout_stime = perout_stime;
+			fep->perout_enable = true;
+
+unlock:
+			spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+			mutex_unlock(&fep->ptp_clk_mutex);
+
+			if (ret)
+				return ret;
+
+			/* Because the timer counter of FEC only has 31-bits, correspondingly,
+			 * the time comparison register FEC_TCCR also only low 31 bits can be
+			 * set. If the start time of pps signal exceeds current time more than
+			 * 0x80000000 ns, a software timer is used and the timer expires about
+			 * 1 second before the start time to be able to set FEC_TCCR.
+			 */
+			if (delta > FEC_PTP_MAX_NSEC_COUNTER) {
+				timeout = ns_to_ktime(delta - NSEC_PER_SEC);
+				hrtimer_start(&fep->perout_timer, timeout, HRTIMER_MODE_REL);
+			} else {
+				return fec_ptp_pps_perout(fep);
+			}
+		} else {
+			fec_ptp_pps_disable(fep, fep->pps_channel);
+		}
+
+		return 0;
+	} else {
+		return -EOPNOTSUPP;
 	}
-	return -EOPNOTSUPP;
 }
 
-int fec_ptp_set(struct net_device *ndev, struct ifreq *ifr)
+int fec_ptp_set(struct net_device *ndev, struct kernel_hwtstamp_config *config,
+		struct netlink_ext_ack *extack)
 {
 	struct fec_enet_private *fep = netdev_priv(ndev);
 
-	struct hwtstamp_config config;
-
-	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
-		return -EFAULT;
-
-	/* reserved for future extensions */
-	if (config.flags)
-		return -EINVAL;
-
-	switch (config.tx_type) {
+	switch (config->tx_type) {
 	case HWTSTAMP_TX_OFF:
 		fep->hwts_tx_en = 0;
 		break;
@@ -476,38 +650,31 @@ int fec_ptp_set(struct net_device *ndev, struct ifreq *ifr)
 		return -ERANGE;
 	}
 
-	switch (config.rx_filter) {
+	switch (config->rx_filter) {
 	case HWTSTAMP_FILTER_NONE:
-		if (fep->hwts_rx_en)
-			fep->hwts_rx_en = 0;
-		config.rx_filter = HWTSTAMP_FILTER_NONE;
+		fep->hwts_rx_en = 0;
 		break;
 
 	default:
 		fep->hwts_rx_en = 1;
-		config.rx_filter = HWTSTAMP_FILTER_ALL;
+		config->rx_filter = HWTSTAMP_FILTER_ALL;
 		break;
 	}
 
-	return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
-	    -EFAULT : 0;
+	return 0;
 }
 
-int fec_ptp_get(struct net_device *ndev, struct ifreq *ifr)
+void fec_ptp_get(struct net_device *ndev, struct kernel_hwtstamp_config *config)
 {
 	struct fec_enet_private *fep = netdev_priv(ndev);
-	struct hwtstamp_config config;
 
-	config.flags = 0;
-	config.tx_type = fep->hwts_tx_en ? HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF;
-	config.rx_filter = (fep->hwts_rx_en ?
-			    HWTSTAMP_FILTER_ALL : HWTSTAMP_FILTER_NONE);
-
-	return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
-		-EFAULT : 0;
+	config->flags = 0;
+	config->tx_type = fep->hwts_tx_en ? HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF;
+	config->rx_filter = (fep->hwts_rx_en ?
+			     HWTSTAMP_FILTER_ALL : HWTSTAMP_FILTER_NONE);
 }
 
-/**
+/*
  * fec_time_keep - call timecounter_read every second to avoid timer overrun
  *                 because ENET just support 32bit counter, will timeout in 4s
  */
@@ -515,13 +682,12 @@ static void fec_time_keep(struct work_struct *work)
 {
 	struct delayed_work *dwork = to_delayed_work(work);
 	struct fec_enet_private *fep = container_of(dwork, struct fec_enet_private, time_keep);
-	u64 ns;
 	unsigned long flags;
 
 	mutex_lock(&fep->ptp_clk_mutex);
 	if (fep->ptp_clk_on) {
 		spin_lock_irqsave(&fep->tmreg_lock, flags);
-		ns = timecounter_read(&fep->tc);
+		timecounter_read(&fep->tc);
 		spin_unlock_irqrestore(&fep->tmreg_lock, flags);
 	}
 	mutex_unlock(&fep->ptp_clk_mutex);
@@ -552,8 +718,11 @@ static irqreturn_t fec_pps_interrupt(int irq, void *dev_id)
 		fep->next_counter = (fep->next_counter + fep->reload_period) &
 				fep->cc.mask;
 
-		event.type = PTP_CLOCK_PPS;
-		ptp_clock_event(fep->ptp_clock, &event);
+		if (fep->pps_enable) {
+			event.type = PTP_CLOCK_PPS;
+			ptp_clock_event(fep->ptp_clock, &event);
+		}
+
 		return IRQ_HANDLED;
 	}
 
@@ -562,7 +731,8 @@ static irqreturn_t fec_pps_interrupt(int irq, void *dev_id)
 
 /**
  * fec_ptp_init
- * @ndev: The FEC network adapter
+ * @pdev: The FEC network adapter
+ * @irq_idx: the interrupt index
  *
  * This function performs the required steps for enabling ptp
  * support. If ptp support has already been loaded it simply calls the
@@ -573,25 +743,33 @@ void fec_ptp_init(struct platform_device *pdev, int irq_idx)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct fec_enet_private *fep = netdev_priv(ndev);
+	struct device_node *np = fep->pdev->dev.of_node;
 	int irq;
 	int ret;
 
 	fep->ptp_caps.owner = THIS_MODULE;
-	snprintf(fep->ptp_caps.name, 16, "fec ptp");
+	strscpy(fep->ptp_caps.name, "fec ptp", sizeof(fep->ptp_caps.name));
+
+	fep->pps_channel = DEFAULT_PPS_CHANNEL;
+	of_property_read_u32(np, "fsl,pps-channel", &fep->pps_channel);
 
 	fep->ptp_caps.max_adj = 250000000;
 	fep->ptp_caps.n_alarm = 0;
 	fep->ptp_caps.n_ext_ts = 0;
-	fep->ptp_caps.n_per_out = 0;
+	fep->ptp_caps.n_per_out = 1;
 	fep->ptp_caps.n_pins = 0;
 	fep->ptp_caps.pps = 1;
-	fep->ptp_caps.adjfreq = fec_ptp_adjfreq;
+	fep->ptp_caps.adjfine = fec_ptp_adjfine;
 	fep->ptp_caps.adjtime = fec_ptp_adjtime;
 	fep->ptp_caps.gettime64 = fec_ptp_gettime;
 	fep->ptp_caps.settime64 = fec_ptp_settime;
 	fep->ptp_caps.enable = fec_ptp_enable;
 
 	fep->cycle_speed = clk_get_rate(fep->clk_ptp);
+	if (!fep->cycle_speed) {
+		fep->cycle_speed = NSEC_PER_SEC;
+		dev_err(&fep->pdev->dev, "clk_ptp clock rate is zero\n");
+	}
 	fep->ptp_inc = NSEC_PER_SEC / fep->cycle_speed;
 
 	spin_lock_init(&fep->tmreg_lock);
@@ -600,9 +778,12 @@ void fec_ptp_init(struct platform_device *pdev, int irq_idx)
 
 	INIT_DELAYED_WORK(&fep->time_keep, fec_time_keep);
 
-	irq = platform_get_irq_byname(pdev, "pps");
+	hrtimer_setup(&fep->perout_timer, fec_ptp_pps_perout_handler, CLOCK_REALTIME,
+		      HRTIMER_MODE_REL);
+
+	irq = platform_get_irq_byname_optional(pdev, "pps");
 	if (irq < 0)
-		irq = platform_get_irq(pdev, irq_idx);
+		irq = platform_get_irq_optional(pdev, irq_idx);
 	/* Failure to get an irq is not fatal,
 	 * only the PTP_CLOCK_PPS clock events should stop
 	 */
@@ -617,18 +798,72 @@ void fec_ptp_init(struct platform_device *pdev, int irq_idx)
 	fep->ptp_clock = ptp_clock_register(&fep->ptp_caps, &pdev->dev);
 	if (IS_ERR(fep->ptp_clock)) {
 		fep->ptp_clock = NULL;
-		pr_err("ptp_clock_register failed\n");
+		dev_err(&pdev->dev, "ptp_clock_register failed\n");
 	}
 
 	schedule_delayed_work(&fep->time_keep, HZ);
 }
 
+void fec_ptp_save_state(struct fec_enet_private *fep)
+{
+	unsigned long flags;
+	u32 atime_inc_corr;
+
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+
+	fep->ptp_saved_state.pps_enable = fep->pps_enable;
+
+	fep->ptp_saved_state.ns_phc = timecounter_read(&fep->tc);
+	fep->ptp_saved_state.ns_sys = ktime_get_ns();
+
+	fep->ptp_saved_state.at_corr = readl(fep->hwp + FEC_ATIME_CORR);
+	atime_inc_corr = readl(fep->hwp + FEC_ATIME_INC) & FEC_T_INC_CORR_MASK;
+	fep->ptp_saved_state.at_inc_corr = (u8)(atime_inc_corr >> FEC_T_INC_CORR_OFFSET);
+
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+}
+
+/* Restore PTP functionality after a reset */
+void fec_ptp_restore_state(struct fec_enet_private *fep)
+{
+	u32 atime_inc = readl(fep->hwp + FEC_ATIME_INC) & FEC_T_INC_MASK;
+	unsigned long flags;
+	u32 counter;
+	u64 ns;
+
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+
+	/* Reset turned it off, so adjust our status flag */
+	fep->pps_enable = 0;
+
+	writel(fep->ptp_saved_state.at_corr, fep->hwp + FEC_ATIME_CORR);
+	atime_inc |= ((u32)fep->ptp_saved_state.at_inc_corr) << FEC_T_INC_CORR_OFFSET;
+	writel(atime_inc, fep->hwp + FEC_ATIME_INC);
+
+	ns = ktime_get_ns() - fep->ptp_saved_state.ns_sys + fep->ptp_saved_state.ns_phc;
+	counter = ns & fep->cc.mask;
+	writel(counter, fep->hwp + FEC_ATIME);
+	timecounter_init(&fep->tc, &fep->cc, ns);
+
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+
+	/* Restart PPS if needed */
+	if (fep->ptp_saved_state.pps_enable) {
+		/* Re-enable PPS */
+		fec_ptp_enable_pps(fep, 1);
+	}
+}
+
 void fec_ptp_stop(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct fec_enet_private *fep = netdev_priv(ndev);
 
+	if (fep->pps_enable)
+		fec_ptp_enable_pps(fep, 0);
+
 	cancel_delayed_work_sync(&fep->time_keep);
+	hrtimer_cancel(&fep->perout_timer);
 	if (fep->ptp_clock)
 		ptp_clock_unregister(fep->ptp_clock);
 }