Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 780 insertions, 0 deletions

diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c
new file mode 100644
index 0000000000..181d9bfbee
--- /dev/null
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -0,0 +1,780 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Fast Ethernet Controller (ENET) PTP driver for MX6x.
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ */
+
+#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/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/phy.h>
+#include <linux/fec.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_net.h>
+
+#include "fec.h"
+
+/* FEC 1588 register bits */
+#define FEC_T_CTRL_SLAVE                0x00002000
+#define FEC_T_CTRL_CAPTURE              0x00000800
+#define FEC_T_CTRL_RESTART              0x00000200
+#define FEC_T_CTRL_PERIOD_RST           0x00000030
+#define FEC_T_CTRL_PERIOD_EN		0x00000010
+#define FEC_T_CTRL_ENABLE               0x00000001
+
+#define FEC_T_INC_MASK                  0x0000007f
+#define FEC_T_INC_OFFSET                0
+#define FEC_T_INC_CORR_MASK             0x00007f00
+#define FEC_T_INC_CORR_OFFSET           8
+
+#define FEC_T_CTRL_PINPER		0x00000080
+#define FEC_T_TF0_MASK			0x00000001
+#define FEC_T_TF0_OFFSET		0
+#define FEC_T_TF1_MASK			0x00000002
+#define FEC_T_TF1_OFFSET		1
+#define FEC_T_TF2_MASK			0x00000004
+#define FEC_T_TF2_OFFSET		2
+#define FEC_T_TF3_MASK			0x00000008
+#define FEC_T_TF3_OFFSET		3
+#define FEC_T_TDRE_MASK			0x00000001
+#define FEC_T_TDRE_OFFSET		0
+#define FEC_T_TMODE_MASK		0x0000003C
+#define FEC_T_TMODE_OFFSET		2
+#define FEC_T_TIE_MASK			0x00000040
+#define FEC_T_TIE_OFFSET		6
+#define FEC_T_TF_MASK			0x00000080
+#define FEC_T_TF_OFFSET			7
+
+#define FEC_ATIME_CTRL		0x400
+#define FEC_ATIME		0x404
+#define FEC_ATIME_EVT_OFFSET	0x408
+#define FEC_ATIME_EVT_PERIOD	0x40c
+#define FEC_ATIME_CORR		0x410
+#define FEC_ATIME_INC		0x414
+#define FEC_TS_TIMESTAMP	0x418
+
+#define FEC_TGSR		0x604
+#define FEC_TCSR(n)		(0x608 + n * 0x08)
+#define FEC_TCCR(n)		(0x60C + n * 0x08)
+#define MAX_TIMER_CHANNEL	3
+#define FEC_TMODE_TOGGLE	0x05
+#define FEC_HIGH_PULSE		0x0F
+
+#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 FEC_PTP_MAX_NSEC_PERIOD		4000000000ULL
+#define FEC_PTP_MAX_NSEC_COUNTER	0x80000000ULL
+
+/**
+ * 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.
+ */
+static int fec_ptp_enable_pps(struct fec_enet_private *fep, uint enable)
+{
+	unsigned long flags;
+	u32 val, tempval;
+	struct timespec64 ts;
+	u64 ns;
+
+	if (fep->pps_enable == enable)
+		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.
+		 */
+		writel(FEC_T_TF_MASK, fep->hwp + FEC_TCSR(fep->pps_channel));
+
+		/* It is recommended to double check the TMODE field in the
+		 * TCSR register to be cleared before the first compare counter
+		 * is written into TCCR register. Just add a double check.
+		 */
+		val = readl(fep->hwp + FEC_TCSR(fep->pps_channel));
+		do {
+			val &= ~(FEC_T_TMODE_MASK);
+			writel(val, fep->hwp + FEC_TCSR(fep->pps_channel));
+			val = readl(fep->hwp + FEC_TCSR(fep->pps_channel));
+		} while (val & FEC_T_TMODE_MASK);
+
+		/* Dummy read counter to update the counter */
+		timecounter_read(&fep->tc);
+		/* We want to find the first compare event in the next
+		 * second point. So we need to know what the ptp time
+		 * is now and how many nanoseconds is ahead to get next second.
+		 * The remaining nanosecond ahead before the next second would be
+		 * NSEC_PER_SEC - ts.tv_nsec. Add the remaining nanoseconds
+		 * to current timer would be next second.
+		 */
+		tempval = fep->cc.read(&fep->cc);
+		/* Convert the ptp local counter to 1588 timestamp */
+		ns = timecounter_cyc2time(&fep->tc, tempval);
+		ts = ns_to_timespec64(ns);
+
+		/* The tempval is  less than 3 seconds, and  so val is less than
+		 * 4 seconds. No overflow for 32bit calculation.
+		 */
+		val = NSEC_PER_SEC - (u32)ts.tv_nsec + tempval;
+
+		/* Need to consider the situation that the current time is
+		 * 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
+		 * 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
+		 * around over 2 seconds. So it is okay to set the next of next
+		 * seond for the timer.
+		 */
+		val += NSEC_PER_SEC;
+
+		/* We add (2 * NSEC_PER_SEC - (u32)ts.tv_nsec) to current
+		 * ptp counter, which maybe cause 32-bit wrap. Since the
+		 * (NSEC_PER_SEC - (u32)ts.tv_nsec) is less than 2 second.
+		 * We can ensure the wrap will not cause issue. If the offset
+		 * is bigger than fep->cc.mask would be a error.
+		 */
+		val &= fep->cc.mask;
+		writel(val, fep->hwp + FEC_TCCR(fep->pps_channel));
+
+		/* Calculate the second the compare event timestamp */
+		fep->next_counter = (val + fep->reload_period) & fep->cc.mask;
+
+		/* * Enable compare event when overflow */
+		val = readl(fep->hwp + FEC_ATIME_CTRL);
+		val |= FEC_T_CTRL_PINPER;
+		writel(val, fep->hwp + FEC_ATIME_CTRL);
+
+		/* Compare channel setting. */
+		val = readl(fep->hwp + FEC_TCSR(fep->pps_channel));
+		val |= (1 << FEC_T_TF_OFFSET | 1 << FEC_T_TIE_OFFSET);
+		val &= ~(1 << FEC_T_TDRE_OFFSET);
+		val &= ~(FEC_T_TMODE_MASK);
+		val |= (FEC_HIGH_PULSE << FEC_T_TMODE_OFFSET);
+		writel(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;
+	} else {
+		writel(0, fep->hwp + FEC_TCSR(fep->pps_channel));
+	}
+
+	fep->pps_enable = enable;
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+
+	return 0;
+}
+
+static int fec_ptp_pps_perout(struct fec_enet_private *fep)
+{
+	u32 compare_val, ptp_hc, temp_val;
+	u64 curr_time;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+
+	/* Update time counter */
+	timecounter_read(&fep->tc);
+
+	/* Get the current ptp hardware time counter */
+	temp_val = readl(fep->hwp + FEC_ATIME_CTRL);
+	temp_val |= FEC_T_CTRL_CAPTURE;
+	writel(temp_val, fep->hwp + FEC_ATIME_CTRL);
+	if (fep->quirks & FEC_QUIRK_BUG_CAPTURE)
+		udelay(1);
+
+	ptp_hc = readl(fep->hwp + FEC_ATIME);
+
+	/* 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) {
+		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;
+}
+
+/**
+ * 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)
+{
+	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_start_cyclecounter - create the cycle counter from hw
+ * @ndev: network device
+ *
+ * this function initializes the timecounter and cyclecounter
+ * structures for use in generated a ns counter from the arbitrary
+ * fixed point cycles registers in the hardware.
+ */
+void fec_ptp_start_cyclecounter(struct net_device *ndev)
+{
+	struct fec_enet_private *fep = netdev_priv(ndev);
+	unsigned long flags;
+	int inc;
+
+	inc = 1000000000 / fep->cycle_speed;
+
+	/* grab the ptp lock */
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+
+	/* 1ns counter */
+	writel(inc << FEC_T_INC_OFFSET, fep->hwp + FEC_ATIME_INC);
+
+	/* use 31-bit timer counter */
+	writel(FEC_COUNTER_PERIOD, fep->hwp + FEC_ATIME_EVT_PERIOD);
+
+	writel(FEC_T_CTRL_ENABLE | FEC_T_CTRL_PERIOD_RST,
+		fep->hwp + FEC_ATIME_CTRL);
+
+	memset(&fep->cc, 0, sizeof(fep->cc));
+	fep->cc.read = fec_ptp_read;
+	fep->cc.mask = CLOCKSOURCE_MASK(31);
+	fep->cc.shift = 31;
+	fep->cc.mult = FEC_CC_MULT;
+
+	/* reset the ns time counter */
+	timecounter_init(&fep->tc, &fep->cc, 0);
+
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+}
+
+/**
+ * fec_ptp_adjfine - adjust ptp cycle frequency
+ * @ptp: the ptp clock structure
+ * @scaled_ppm: scaled parts per million adjustment from base
+ *
+ * Adjust the frequency of the ptp cycle counter by the
+ * 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_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;
+	u32 corr_inc, corr_period;
+	u32 corr_ns;
+	u64 lhs, rhs;
+
+	struct fec_enet_private *fep =
+	    container_of(ptp, struct fec_enet_private, ptp_caps);
+
+	if (ppb == 0)
+		return 0;
+
+	if (ppb < 0) {
+		ppb = -ppb;
+		neg_adj = 1;
+	}
+
+	/* In theory, corr_inc/corr_period = ppb/NSEC_PER_SEC;
+	 * Try to find the corr_inc  between 1 to fep->ptp_inc to
+	 * meet adjustment requirement.
+	 */
+	lhs = NSEC_PER_SEC;
+	rhs = (u64)ppb * (u64)fep->ptp_inc;
+	for (i = 1; i <= fep->ptp_inc; i++) {
+		if (lhs >= rhs) {
+			corr_inc = i;
+			corr_period = div_u64(lhs, rhs);
+			break;
+		}
+		lhs += NSEC_PER_SEC;
+	}
+	/* Not found? Set it to high value - double speed
+	 * correct in every clock step.
+	 */
+	if (i > fep->ptp_inc) {
+		corr_inc = fep->ptp_inc;
+		corr_period = 1;
+	}
+
+	if (neg_adj)
+		corr_ns = fep->ptp_inc - corr_inc;
+	else
+		corr_ns = fep->ptp_inc + corr_inc;
+
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+
+	tmp = readl(fep->hwp + FEC_ATIME_INC) & FEC_T_INC_MASK;
+	tmp |= corr_ns << FEC_T_INC_CORR_OFFSET;
+	writel(tmp, fep->hwp + FEC_ATIME_INC);
+	corr_period = corr_period > 1 ? corr_period - 1 : corr_period;
+	writel(corr_period, fep->hwp + FEC_ATIME_CORR);
+	/* dummy read to update the timer. */
+	timecounter_read(&fep->tc);
+
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+
+	return 0;
+}
+
+/**
+ * fec_ptp_adjtime
+ * @ptp: the ptp clock structure
+ * @delta: offset to adjust the cycle counter by
+ *
+ * adjust the timer by resetting the timecounter structure.
+ */
+static int fec_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+	struct fec_enet_private *fep =
+	    container_of(ptp, struct fec_enet_private, ptp_caps);
+	unsigned long flags;
+
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+	timecounter_adjtime(&fep->tc, delta);
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+
+	return 0;
+}
+
+/**
+ * fec_ptp_gettime
+ * @ptp: the ptp clock structure
+ * @ts: timespec structure to hold the current time value
+ *
+ * read the timecounter and return the correct value on ns,
+ * after converting it into a struct timespec.
+ */
+static int fec_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
+{
+	struct fec_enet_private *fep =
+	    container_of(ptp, struct fec_enet_private, ptp_caps);
+	u64 ns;
+	unsigned long 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);
+
+	return 0;
+}
+
+/**
+ * fec_ptp_settime
+ * @ptp: the ptp clock structure
+ * @ts: the 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 fec_ptp_settime(struct ptp_clock_info *ptp,
+			   const struct timespec64 *ts)
+{
+	struct fec_enet_private *fep =
+	    container_of(ptp, struct fec_enet_private, ptp_caps);
+
+	u64 ns;
+	unsigned long flags;
+	u32 counter;
+
+	mutex_lock(&fep->ptp_clk_mutex);
+	/* Check the ptp clock */
+	if (!fep->ptp_clk_on) {
+		mutex_unlock(&fep->ptp_clk_mutex);
+		return -EINVAL;
+	}
+
+	ns = timespec64_to_ns(ts);
+	/* Get the timer value based on timestamp.
+	 * Update the counter with the masked value.
+	 */
+	counter = ns & fep->cc.mask;
+
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+	writel(counter, fep->hwp + FEC_ATIME);
+	timecounter_init(&fep->tc, &fep->cc, ns);
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+	mutex_unlock(&fep->ptp_clk_mutex);
+	return 0;
+}
+
+static int fec_ptp_pps_disable(struct fec_enet_private *fep, uint channel)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&fep->tmreg_lock, flags);
+	writel(0, fep->hwp + FEC_TCSR(channel));
+	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+
+	return 0;
+}
+
+/**
+ * fec_ptp_enable
+ * @ptp: the ptp clock structure
+ * @rq: the requested feature to change
+ * @on: whether to enable or disable the feature
+ *
+ */
+static int fec_ptp_enable(struct ptp_clock_info *ptp,
+			  struct ptp_clock_request *rq, int on)
+{
+	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) {
+		ret = fec_ptp_enable_pps(fep, on);
+
+		return ret;
+	} else if (rq->type == PTP_CLK_REQ_PEROUT) {
+		/* Reject requests with unsupported flags */
+		if (rq->perout.flags)
+			return -EOPNOTSUPP;
+
+		if (rq->perout.index != DEFAULT_PPS_CHANNEL)
+			return -EOPNOTSUPP;
+
+		fep->pps_channel = DEFAULT_PPS_CHANNEL;
+		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;
+		}
+
+		fep->reload_period = div_u64(period_ns, 2);
+		if (on && fep->reload_period) {
+			/* Convert 1588 timestamp to ns*/
+			start_time.tv_sec = rq->perout.start.sec;
+			start_time.tv_nsec = rq->perout.start.nsec;
+			fep->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);
+			/* Read current timestamp */
+			curr_time = timecounter_read(&fep->tc);
+			spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+			mutex_unlock(&fep->ptp_clk_mutex);
+
+			/* Calculate time difference */
+			delta = fep->perout_stime - curr_time;
+
+			if (fep->perout_stime <= curr_time) {
+				dev_err(&fep->pdev->dev, "Start time must larger than current time!\n");
+				return -EINVAL;
+			}
+
+			/* 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;
+	}
+}
+
+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);
+
+	switch (config->tx_type) {
+	case HWTSTAMP_TX_OFF:
+		fep->hwts_tx_en = 0;
+		break;
+	case HWTSTAMP_TX_ON:
+		fep->hwts_tx_en = 1;
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	switch (config->rx_filter) {
+	case HWTSTAMP_FILTER_NONE:
+		fep->hwts_rx_en = 0;
+		break;
+
+	default:
+		fep->hwts_rx_en = 1;
+		config->rx_filter = HWTSTAMP_FILTER_ALL;
+		break;
+	}
+
+	return 0;
+}
+
+void fec_ptp_get(struct net_device *ndev, struct kernel_hwtstamp_config *config)
+{
+	struct fec_enet_private *fep = netdev_priv(ndev);
+
+	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
+ */
+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);
+	unsigned long flags;
+
+	mutex_lock(&fep->ptp_clk_mutex);
+	if (fep->ptp_clk_on) {
+		spin_lock_irqsave(&fep->tmreg_lock, flags);
+		timecounter_read(&fep->tc);
+		spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+	}
+	mutex_unlock(&fep->ptp_clk_mutex);
+
+	schedule_delayed_work(&fep->time_keep, HZ);
+}
+
+/* This function checks the pps event and reloads the timer compare counter. */
+static irqreturn_t fec_pps_interrupt(int irq, void *dev_id)
+{
+	struct net_device *ndev = dev_id;
+	struct fec_enet_private *fep = netdev_priv(ndev);
+	u32 val;
+	u8 channel = fep->pps_channel;
+	struct ptp_clock_event event;
+
+	val = readl(fep->hwp + FEC_TCSR(channel));
+	if (val & FEC_T_TF_MASK) {
+		/* Write the next next compare(not the next according the spec)
+		 * value to the register
+		 */
+		writel(fep->next_counter, fep->hwp + FEC_TCCR(channel));
+		do {
+			writel(val, fep->hwp + FEC_TCSR(channel));
+		} while (readl(fep->hwp + FEC_TCSR(channel)) & FEC_T_TF_MASK);
+
+		/* Update the counter; */
+		fep->next_counter = (fep->next_counter + fep->reload_period) &
+				fep->cc.mask;
+
+		event.type = PTP_CLOCK_PPS;
+		ptp_clock_event(fep->ptp_clock, &event);
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+/**
+ * fec_ptp_init
+ * @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
+ * cyclecounter init routine and exits.
+ */
+
+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);
+	int irq;
+	int ret;
+
+	fep->ptp_caps.owner = THIS_MODULE;
+	strscpy(fep->ptp_caps.name, "fec ptp", sizeof(fep->ptp_caps.name));
+
+	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 = 1;
+	fep->ptp_caps.n_pins = 0;
+	fep->ptp_caps.pps = 1;
+	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);
+
+	fec_ptp_start_cyclecounter(ndev);
+
+	INIT_DELAYED_WORK(&fep->time_keep, fec_time_keep);
+
+	hrtimer_init(&fep->perout_timer, CLOCK_REALTIME, HRTIMER_MODE_REL);
+	fep->perout_timer.function = fec_ptp_pps_perout_handler;
+
+	irq = platform_get_irq_byname_optional(pdev, "pps");
+	if (irq < 0)
+		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
+	 */
+	if (irq >= 0) {
+		ret = devm_request_irq(&pdev->dev, irq, fec_pps_interrupt,
+				       0, pdev->name, ndev);
+		if (ret < 0)
+			dev_warn(&pdev->dev, "request for pps irq failed(%d)\n",
+				 ret);
+	}
+
+	fep->ptp_clock = ptp_clock_register(&fep->ptp_caps, &pdev->dev);
+	if (IS_ERR(fep->ptp_clock)) {
+		fep->ptp_clock = NULL;
+		dev_err(&pdev->dev, "ptp_clock_register failed\n");
+	}
+
+	schedule_delayed_work(&fep->time_keep, HZ);
+}
+
+void fec_ptp_stop(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct fec_enet_private *fep = netdev_priv(ndev);
+
+	cancel_delayed_work_sync(&fep->time_keep);
+	hrtimer_cancel(&fep->perout_timer);
+	if (fep->ptp_clock)
+		ptp_clock_unregister(fep->ptp_clock);
+}