1 files changed, 618 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
new file mode 100644
index 000000000000..ae782778d6dd
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
@@ -0,0 +1,618 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/ptp_classify.h>
+
+#include "lan966x_main.h"
+
+#define LAN966X_MAX_PTP_ID	512
+
+/* Represents 1ppm adjustment in 2^59 format with 6.037735849ns as reference
+ * The value is calculated as following: (1/1000000)/((2^-59)/6.037735849)
+ */
+#define LAN966X_1PPM_FORMAT		3480517749723LL
+
+/* Represents 1ppb adjustment in 2^29 format with 6.037735849ns as reference
+ * The value is calculated as following: (1/1000000000)/((2^59)/6.037735849)
+ */
+#define LAN966X_1PPB_FORMAT		3480517749LL
+
+#define TOD_ACC_PIN		0x5
+
+enum {
+	PTP_PIN_ACTION_IDLE = 0,
+	PTP_PIN_ACTION_LOAD,
+	PTP_PIN_ACTION_SAVE,
+	PTP_PIN_ACTION_CLOCK,
+	PTP_PIN_ACTION_DELTA,
+	PTP_PIN_ACTION_TOD
+};
+
+static u64 lan966x_ptp_get_nominal_value(void)
+{
+	u64 res = 0x304d2df1;
+
+	res <<= 32;
+	return res;
+}
+
+int lan966x_ptp_hwtstamp_set(struct lan966x_port *port, struct ifreq *ifr)
+{
+	struct lan966x *lan966x = port->lan966x;
+	struct hwtstamp_config cfg;
+	struct lan966x_phc *phc;
+
+	/* For now don't allow to run ptp on ports that are part of a bridge,
+	 * because in case of transparent clock the HW will still forward the
+	 * frames, so there would be duplicate frames
+	 */
+	if (lan966x->bridge_mask & BIT(port->chip_port))
+		return -EINVAL;
+
+	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
+		return -EFAULT;
+
+	switch (cfg.tx_type) {
+	case HWTSTAMP_TX_ON:
+		port->ptp_cmd = IFH_REW_OP_TWO_STEP_PTP;
+		break;
+	case HWTSTAMP_TX_ONESTEP_SYNC:
+		port->ptp_cmd = IFH_REW_OP_ONE_STEP_PTP;
+		break;
+	case HWTSTAMP_TX_OFF:
+		port->ptp_cmd = IFH_REW_OP_NOOP;
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	switch (cfg.rx_filter) {
+	case HWTSTAMP_FILTER_NONE:
+		break;
+	case HWTSTAMP_FILTER_ALL:
+	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+	case HWTSTAMP_FILTER_PTP_V2_EVENT:
+	case HWTSTAMP_FILTER_PTP_V2_SYNC:
+	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+	case HWTSTAMP_FILTER_NTP_ALL:
+		cfg.rx_filter = HWTSTAMP_FILTER_ALL;
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	/* Commit back the result & save it */
+	mutex_lock(&lan966x->ptp_lock);
+	phc = &lan966x->phc[LAN966X_PHC_PORT];
+	memcpy(&phc->hwtstamp_config, &cfg, sizeof(cfg));
+	mutex_unlock(&lan966x->ptp_lock);
+
+	return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
+}
+
+int lan966x_ptp_hwtstamp_get(struct lan966x_port *port, struct ifreq *ifr)
+{
+	struct lan966x *lan966x = port->lan966x;
+	struct lan966x_phc *phc;
+
+	phc = &lan966x->phc[LAN966X_PHC_PORT];
+	return copy_to_user(ifr->ifr_data, &phc->hwtstamp_config,
+			    sizeof(phc->hwtstamp_config)) ? -EFAULT : 0;
+}
+
+static int lan966x_ptp_classify(struct lan966x_port *port, struct sk_buff *skb)
+{
+	struct ptp_header *header;
+	u8 msgtype;
+	int type;
+
+	if (port->ptp_cmd == IFH_REW_OP_NOOP)
+		return IFH_REW_OP_NOOP;
+
+	type = ptp_classify_raw(skb);
+	if (type == PTP_CLASS_NONE)
+		return IFH_REW_OP_NOOP;
+
+	header = ptp_parse_header(skb, type);
+	if (!header)
+		return IFH_REW_OP_NOOP;
+
+	if (port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP)
+		return IFH_REW_OP_TWO_STEP_PTP;
+
+	/* If it is sync and run 1 step then set the correct operation,
+	 * otherwise run as 2 step
+	 */
+	msgtype = ptp_get_msgtype(header, type);
+	if ((msgtype & 0xf) == 0)
+		return IFH_REW_OP_ONE_STEP_PTP;
+
+	return IFH_REW_OP_TWO_STEP_PTP;
+}
+
+static void lan966x_ptp_txtstamp_old_release(struct lan966x_port *port)
+{
+	struct sk_buff *skb, *skb_tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->tx_skbs.lock, flags);
+	skb_queue_walk_safe(&port->tx_skbs, skb, skb_tmp) {
+		if time_after(LAN966X_SKB_CB(skb)->jiffies + LAN966X_PTP_TIMEOUT,
+			      jiffies)
+			break;
+
+		__skb_unlink(skb, &port->tx_skbs);
+		dev_kfree_skb_any(skb);
+	}
+	spin_unlock_irqrestore(&port->tx_skbs.lock, flags);
+}
+
+int lan966x_ptp_txtstamp_request(struct lan966x_port *port,
+				 struct sk_buff *skb)
+{
+	struct lan966x *lan966x = port->lan966x;
+	unsigned long flags;
+	u8 rew_op;
+
+	rew_op = lan966x_ptp_classify(port, skb);
+	LAN966X_SKB_CB(skb)->rew_op = rew_op;
+
+	if (rew_op != IFH_REW_OP_TWO_STEP_PTP)
+		return 0;
+
+	lan966x_ptp_txtstamp_old_release(port);
+
+	spin_lock_irqsave(&lan966x->ptp_ts_id_lock, flags);
+	if (lan966x->ptp_skbs == LAN966X_MAX_PTP_ID) {
+		spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
+		return -EBUSY;
+	}
+
+	skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+
+	skb_queue_tail(&port->tx_skbs, skb);
+	LAN966X_SKB_CB(skb)->ts_id = port->ts_id;
+	LAN966X_SKB_CB(skb)->jiffies = jiffies;
+
+	lan966x->ptp_skbs++;
+	port->ts_id++;
+	if (port->ts_id == LAN966X_MAX_PTP_ID)
+		port->ts_id = 0;
+
+	spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
+
+	return 0;
+}
+
+void lan966x_ptp_txtstamp_release(struct lan966x_port *port,
+				  struct sk_buff *skb)
+{
+	struct lan966x *lan966x = port->lan966x;
+	unsigned long flags;
+
+	spin_lock_irqsave(&lan966x->ptp_ts_id_lock, flags);
+	port->ts_id--;
+	lan966x->ptp_skbs--;
+	skb_unlink(skb, &port->tx_skbs);
+	spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
+}
+
+static void lan966x_get_hwtimestamp(struct lan966x *lan966x,
+				    struct timespec64 *ts,
+				    u32 nsec)
+{
+	/* Read current PTP time to get seconds */
+	unsigned long flags;
+	u32 curr_nsec;
+
+	spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
+
+	lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) |
+		PTP_PIN_CFG_PIN_DOM_SET(LAN966X_PHC_PORT) |
+		PTP_PIN_CFG_PIN_SYNC_SET(0),
+		PTP_PIN_CFG_PIN_ACTION |
+		PTP_PIN_CFG_PIN_DOM |
+		PTP_PIN_CFG_PIN_SYNC,
+		lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+	ts->tv_sec = lan_rd(lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
+	curr_nsec = lan_rd(lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
+
+	ts->tv_nsec = nsec;
+
+	/* Sec has incremented since the ts was registered */
+	if (curr_nsec < nsec)
+		ts->tv_sec--;
+
+	spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
+}
+
+irqreturn_t lan966x_ptp_irq_handler(int irq, void *args)
+{
+	int budget = LAN966X_MAX_PTP_ID;
+	struct lan966x *lan966x = args;
+
+	while (budget--) {
+		struct sk_buff *skb, *skb_tmp, *skb_match = NULL;
+		struct skb_shared_hwtstamps shhwtstamps;
+		struct lan966x_port *port;
+		struct timespec64 ts;
+		unsigned long flags;
+		u32 val, id, txport;
+		u32 delay;
+
+		val = lan_rd(lan966x, PTP_TWOSTEP_CTRL);
+
+		/* Check if a timestamp can be retrieved */
+		if (!(val & PTP_TWOSTEP_CTRL_VLD))
+			break;
+
+		WARN_ON(val & PTP_TWOSTEP_CTRL_OVFL);
+
+		if (!(val & PTP_TWOSTEP_CTRL_STAMP_TX))
+			continue;
+
+		/* Retrieve the ts Tx port */
+		txport = PTP_TWOSTEP_CTRL_STAMP_PORT_GET(val);
+
+		/* Retrieve its associated skb */
+		port = lan966x->ports[txport];
+
+		/* Retrieve the delay */
+		delay = lan_rd(lan966x, PTP_TWOSTEP_STAMP);
+		delay = PTP_TWOSTEP_STAMP_STAMP_NSEC_GET(delay);
+
+		/* Get next timestamp from fifo, which needs to be the
+		 * rx timestamp which represents the id of the frame
+		 */
+		lan_rmw(PTP_TWOSTEP_CTRL_NXT_SET(1),
+			PTP_TWOSTEP_CTRL_NXT,
+			lan966x, PTP_TWOSTEP_CTRL);
+
+		val = lan_rd(lan966x, PTP_TWOSTEP_CTRL);
+
+		/* Check if a timestamp can be retried */
+		if (!(val & PTP_TWOSTEP_CTRL_VLD))
+			break;
+
+		/* Read RX timestamping to get the ID */
+		id = lan_rd(lan966x, PTP_TWOSTEP_STAMP);
+
+		spin_lock_irqsave(&port->tx_skbs.lock, flags);
+		skb_queue_walk_safe(&port->tx_skbs, skb, skb_tmp) {
+			if (LAN966X_SKB_CB(skb)->ts_id != id)
+				continue;
+
+			__skb_unlink(skb, &port->tx_skbs);
+			skb_match = skb;
+			break;
+		}
+		spin_unlock_irqrestore(&port->tx_skbs.lock, flags);
+
+		/* Next ts */
+		lan_rmw(PTP_TWOSTEP_CTRL_NXT_SET(1),
+			PTP_TWOSTEP_CTRL_NXT,
+			lan966x, PTP_TWOSTEP_CTRL);
+
+		if (WARN_ON(!skb_match))
+			continue;
+
+		spin_lock(&lan966x->ptp_ts_id_lock);
+		lan966x->ptp_skbs--;
+		spin_unlock(&lan966x->ptp_ts_id_lock);
+
+		/* Get the h/w timestamp */
+		lan966x_get_hwtimestamp(lan966x, &ts, delay);
+
+		/* Set the timestamp into the skb */
+		shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
+		skb_tstamp_tx(skb_match, &shhwtstamps);
+
+		dev_kfree_skb_any(skb_match);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int lan966x_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
+{
+	struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
+	struct lan966x *lan966x = phc->lan966x;
+	unsigned long flags;
+	bool neg_adj = 0;
+	u64 tod_inc;
+	u64 ref;
+
+	if (!scaled_ppm)
+		return 0;
+
+	if (scaled_ppm < 0) {
+		neg_adj = 1;
+		scaled_ppm = -scaled_ppm;
+	}
+
+	tod_inc = lan966x_ptp_get_nominal_value();
+
+	/* The multiplication is split in 2 separate additions because of
+	 * overflow issues. If scaled_ppm with 16bit fractional part was bigger
+	 * than 20ppm then we got overflow.
+	 */
+	ref = LAN966X_1PPM_FORMAT * (scaled_ppm >> 16);
+	ref += (LAN966X_1PPM_FORMAT * (0xffff & scaled_ppm)) >> 16;
+	tod_inc = neg_adj ? tod_inc - ref : tod_inc + ref;
+
+	spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
+
+	lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(1 << BIT(phc->index)),
+		PTP_DOM_CFG_CLKCFG_DIS,
+		lan966x, PTP_DOM_CFG);
+
+	lan_wr((u32)tod_inc & 0xFFFFFFFF, lan966x,
+	       PTP_CLK_PER_CFG(phc->index, 0));
+	lan_wr((u32)(tod_inc >> 32), lan966x,
+	       PTP_CLK_PER_CFG(phc->index, 1));
+
+	lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0),
+		PTP_DOM_CFG_CLKCFG_DIS,
+		lan966x, PTP_DOM_CFG);
+
+	spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
+
+	return 0;
+}
+
+static int lan966x_ptp_settime64(struct ptp_clock_info *ptp,
+				 const struct timespec64 *ts)
+{
+	struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
+	struct lan966x *lan966x = phc->lan966x;
+	unsigned long flags;
+
+	spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
+
+	/* Must be in IDLE mode before the time can be loaded */
+	lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
+		PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
+		PTP_PIN_CFG_PIN_SYNC_SET(0),
+		PTP_PIN_CFG_PIN_ACTION |
+		PTP_PIN_CFG_PIN_DOM |
+		PTP_PIN_CFG_PIN_SYNC,
+		lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+	/* Set new value */
+	lan_wr(PTP_TOD_SEC_MSB_TOD_SEC_MSB_SET(upper_32_bits(ts->tv_sec)),
+	       lan966x, PTP_TOD_SEC_MSB(TOD_ACC_PIN));
+	lan_wr(lower_32_bits(ts->tv_sec),
+	       lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
+	lan_wr(ts->tv_nsec, lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
+
+	/* Apply new values */
+	lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_LOAD) |
+		PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
+		PTP_PIN_CFG_PIN_SYNC_SET(0),
+		PTP_PIN_CFG_PIN_ACTION |
+		PTP_PIN_CFG_PIN_DOM |
+		PTP_PIN_CFG_PIN_SYNC,
+		lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+	spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
+
+	return 0;
+}
+
+static int lan966x_ptp_gettime64(struct ptp_clock_info *ptp,
+				 struct timespec64 *ts)
+{
+	struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
+	struct lan966x *lan966x = phc->lan966x;
+	unsigned long flags;
+	time64_t s;
+	s64 ns;
+
+	spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
+
+	lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) |
+		PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
+		PTP_PIN_CFG_PIN_SYNC_SET(0),
+		PTP_PIN_CFG_PIN_ACTION |
+		PTP_PIN_CFG_PIN_DOM |
+		PTP_PIN_CFG_PIN_SYNC,
+		lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+	s = lan_rd(lan966x, PTP_TOD_SEC_MSB(TOD_ACC_PIN));
+	s <<= 32;
+	s |= lan_rd(lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
+	ns = lan_rd(lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
+	ns &= PTP_TOD_NSEC_TOD_NSEC;
+
+	spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
+
+	/* Deal with negative values */
+	if ((ns & 0xFFFFFFF0) == 0x3FFFFFF0) {
+		s--;
+		ns &= 0xf;
+		ns += 999999984;
+	}
+
+	set_normalized_timespec64(ts, s, ns);
+	return 0;
+}
+
+static int lan966x_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+	struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
+	struct lan966x *lan966x = phc->lan966x;
+
+	if (delta > -(NSEC_PER_SEC / 2) && delta < (NSEC_PER_SEC / 2)) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
+
+		/* Must be in IDLE mode before the time can be loaded */
+		lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
+			PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
+			PTP_PIN_CFG_PIN_SYNC_SET(0),
+			PTP_PIN_CFG_PIN_ACTION |
+			PTP_PIN_CFG_PIN_DOM |
+			PTP_PIN_CFG_PIN_SYNC,
+			lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+		lan_wr(PTP_TOD_NSEC_TOD_NSEC_SET(delta),
+		       lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
+
+		/* Adjust time with the value of PTP_TOD_NSEC */
+		lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_DELTA) |
+			PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
+			PTP_PIN_CFG_PIN_SYNC_SET(0),
+			PTP_PIN_CFG_PIN_ACTION |
+			PTP_PIN_CFG_PIN_DOM |
+			PTP_PIN_CFG_PIN_SYNC,
+			lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
+
+		spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
+	} else {
+		/* Fall back using lan966x_ptp_settime64 which is not exact */
+		struct timespec64 ts;
+		u64 now;
+
+		lan966x_ptp_gettime64(ptp, &ts);
+
+		now = ktime_to_ns(timespec64_to_ktime(ts));
+		ts = ns_to_timespec64(now + delta);
+
+		lan966x_ptp_settime64(ptp, &ts);
+	}
+
+	return 0;
+}
+
+static struct ptp_clock_info lan966x_ptp_clock_info = {
+	.owner		= THIS_MODULE,
+	.name		= "lan966x ptp",
+	.max_adj	= 200000,
+	.gettime64	= lan966x_ptp_gettime64,
+	.settime64	= lan966x_ptp_settime64,
+	.adjtime	= lan966x_ptp_adjtime,
+	.adjfine	= lan966x_ptp_adjfine,
+};
+
+static int lan966x_ptp_phc_init(struct lan966x *lan966x,
+				int index,
+				struct ptp_clock_info *clock_info)
+{
+	struct lan966x_phc *phc = &lan966x->phc[index];
+
+	phc->info = *clock_info;
+	phc->clock = ptp_clock_register(&phc->info, lan966x->dev);
+	if (IS_ERR(phc->clock))
+		return PTR_ERR(phc->clock);
+
+	phc->index = index;
+	phc->lan966x = lan966x;
+
+	/* PTP Rx stamping is always enabled.  */
+	phc->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
+
+	return 0;
+}
+
+int lan966x_ptp_init(struct lan966x *lan966x)
+{
+	u64 tod_adj = lan966x_ptp_get_nominal_value();
+	struct lan966x_port *port;
+	int err, i;
+
+	if (!lan966x->ptp)
+		return 0;
+
+	for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
+		err = lan966x_ptp_phc_init(lan966x, i, &lan966x_ptp_clock_info);
+		if (err)
+			return err;
+	}
+
+	spin_lock_init(&lan966x->ptp_clock_lock);
+	spin_lock_init(&lan966x->ptp_ts_id_lock);
+	mutex_init(&lan966x->ptp_lock);
+
+	/* Disable master counters */
+	lan_wr(PTP_DOM_CFG_ENA_SET(0), lan966x, PTP_DOM_CFG);
+
+	/* Configure the nominal TOD increment per clock cycle */
+	lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0x7),
+		PTP_DOM_CFG_CLKCFG_DIS,
+		lan966x, PTP_DOM_CFG);
+
+	for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
+		lan_wr((u32)tod_adj & 0xFFFFFFFF, lan966x,
+		       PTP_CLK_PER_CFG(i, 0));
+		lan_wr((u32)(tod_adj >> 32), lan966x,
+		       PTP_CLK_PER_CFG(i, 1));
+	}
+
+	lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0),
+		PTP_DOM_CFG_CLKCFG_DIS,
+		lan966x, PTP_DOM_CFG);
+
+	/* Enable master counters */
+	lan_wr(PTP_DOM_CFG_ENA_SET(0x7), lan966x, PTP_DOM_CFG);
+
+	for (i = 0; i < lan966x->num_phys_ports; i++) {
+		port = lan966x->ports[i];
+		if (!port)
+			continue;
+
+		skb_queue_head_init(&port->tx_skbs);
+	}
+
+	return 0;
+}
+
+void lan966x_ptp_deinit(struct lan966x *lan966x)
+{
+	struct lan966x_port *port;
+	int i;
+
+	for (i = 0; i < lan966x->num_phys_ports; i++) {
+		port = lan966x->ports[i];
+		if (!port)
+			continue;
+
+		skb_queue_purge(&port->tx_skbs);
+	}
+
+	for (i = 0; i < LAN966X_PHC_COUNT; ++i)
+		ptp_clock_unregister(lan966x->phc[i].clock);
+}
+
+void lan966x_ptp_rxtstamp(struct lan966x *lan966x, struct sk_buff *skb,
+			  u64 timestamp)
+{
+	struct skb_shared_hwtstamps *shhwtstamps;
+	struct lan966x_phc *phc;
+	struct timespec64 ts;
+	u64 full_ts_in_ns;
+
+	if (!lan966x->ptp)
+		return;
+
+	phc = &lan966x->phc[LAN966X_PHC_PORT];
+	lan966x_ptp_gettime64(&phc->info, &ts);
+
+	/* Drop the sub-ns precision */
+	timestamp = timestamp >> 2;
+	if (ts.tv_nsec < timestamp)
+		ts.tv_sec--;
+	ts.tv_nsec = timestamp;
+	full_ts_in_ns = ktime_set(ts.tv_sec, ts.tv_nsec);
+
+	shhwtstamps = skb_hwtstamps(skb);
+	shhwtstamps->hwtstamp = full_ts_in_ns;
+}