xref: /linux/drivers/net/ethernet/intel/ice/ice_ptp.c (revision 23bc637750e4142ef9e86a06872fdf32e74a9050)

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021, Intel Corporation. */

#include "ice.h"
#include "ice_lib.h"
#include "ice_trace.h"

static const char ice_pin_names[][64] = {
	"SDP0",
	"SDP1",
	"SDP2",
	"SDP3",
	"TIME_SYNC",
	"1PPS"
};

static const struct ice_ptp_pin_desc ice_pin_desc_e82x[] = {
	/* name,        gpio,       delay */
	{  TIME_SYNC, {  4, -1 }, { 0,  0 }},
	{  ONE_PPS,   { -1,  5 }, { 0, 11 }},
};

static const struct ice_ptp_pin_desc ice_pin_desc_e825c[] = {
	/* name,        gpio,       delay */
	{  SDP0,      {  0,  0 }, { 15, 14 }},
	{  SDP1,      {  1,  1 }, { 15, 14 }},
	{  SDP2,      {  2,  2 }, { 15, 14 }},
	{  SDP3,      {  3,  3 }, { 15, 14 }},
	{  TIME_SYNC, {  4, -1 }, { 11,  0 }},
	{  ONE_PPS,   { -1,  5 }, {  0,  9 }},
};

static const struct ice_ptp_pin_desc ice_pin_desc_e810[] = {
	/* name,        gpio,       delay */
	{  SDP0,      {  0,  0 }, { 0, 1 }},
	{  SDP1,      {  1,  1 }, { 0, 1 }},
	{  SDP2,      {  2,  2 }, { 0, 1 }},
	{  SDP3,      {  3,  3 }, { 0, 1 }},
	{  ONE_PPS,   { -1,  5 }, { 0, 1 }},
};

static const char ice_pin_names_dpll[][64] = {
	"SDP20",
	"SDP21",
	"SDP22",
	"SDP23",
};

static const struct ice_ptp_pin_desc ice_pin_desc_dpll[] = {
	/* name,   gpio,       delay */
	{  SDP0, { -1,  0 }, { 0, 1 }},
	{  SDP1, {  1, -1 }, { 0, 0 }},
	{  SDP2, { -1,  2 }, { 0, 1 }},
	{  SDP3, {  3, -1 }, { 0, 0 }},
};

static struct ice_pf *ice_get_ctrl_pf(struct ice_pf *pf)
{
	return !pf->adapter ? NULL : pf->adapter->ctrl_pf;
}

static struct ice_ptp *ice_get_ctrl_ptp(struct ice_pf *pf)
{
	struct ice_pf *ctrl_pf = ice_get_ctrl_pf(pf);

	return !ctrl_pf ? NULL : &ctrl_pf->ptp;
}

/**
 * ice_ptp_find_pin_idx - Find pin index in ptp_pin_desc
 * @pf: Board private structure
 * @func: Pin function
 * @chan: GPIO channel
 *
 * Return: positive pin number when pin is present, -1 otherwise
 */
static int ice_ptp_find_pin_idx(struct ice_pf *pf, enum ptp_pin_function func,
				unsigned int chan)
{
	const struct ptp_clock_info *info = &pf->ptp.info;
	int i;

	for (i = 0; i < info->n_pins; i++) {
		if (info->pin_config[i].func == func &&
		    info->pin_config[i].chan == chan)
			return i;
	}

	return -1;
}

/**
 * ice_ptp_cfg_tx_interrupt - Configure Tx timestamp interrupt for the device
 * @pf: Board private structure
 *
 * Program the device to respond appropriately to the Tx timestamp interrupt
 * cause.
 */
static void ice_ptp_cfg_tx_interrupt(struct ice_pf *pf)
{
	struct ice_hw *hw = &pf->hw;
	bool enable;
	u32 val;

	switch (pf->ptp.tx_interrupt_mode) {
	case ICE_PTP_TX_INTERRUPT_ALL:
		/* React to interrupts across all quads. */
		wr32(hw, PFINT_TSYN_MSK + (0x4 * hw->pf_id), (u32)0x1f);
		enable = true;
		break;
	case ICE_PTP_TX_INTERRUPT_NONE:
		/* Do not react to interrupts on any quad. */
		wr32(hw, PFINT_TSYN_MSK + (0x4 * hw->pf_id), (u32)0x0);
		enable = false;
		break;
	case ICE_PTP_TX_INTERRUPT_SELF:
	default:
		enable = pf->ptp.tstamp_config.tx_type == HWTSTAMP_TX_ON;
		break;
	}

	/* Configure the Tx timestamp interrupt */
	val = rd32(hw, PFINT_OICR_ENA);
	if (enable)
		val |= PFINT_OICR_TSYN_TX_M;
	else
		val &= ~PFINT_OICR_TSYN_TX_M;
	wr32(hw, PFINT_OICR_ENA, val);
}

/**
 * ice_set_rx_tstamp - Enable or disable Rx timestamping
 * @pf: The PF pointer to search in
 * @on: bool value for whether timestamps are enabled or disabled
 */
static void ice_set_rx_tstamp(struct ice_pf *pf, bool on)
{
	struct ice_vsi *vsi;
	u16 i;

	vsi = ice_get_main_vsi(pf);
	if (!vsi || !vsi->rx_rings)
		return;

	/* Set the timestamp flag for all the Rx rings */
	ice_for_each_rxq(vsi, i) {
		if (!vsi->rx_rings[i])
			continue;
		vsi->rx_rings[i]->ptp_rx = on;
	}
}

/**
 * ice_ptp_disable_timestamp_mode - Disable current timestamp mode
 * @pf: Board private structure
 *
 * Called during preparation for reset to temporarily disable timestamping on
 * the device. Called during remove to disable timestamping while cleaning up
 * driver resources.
 */
static void ice_ptp_disable_timestamp_mode(struct ice_pf *pf)
{
	struct ice_hw *hw = &pf->hw;
	u32 val;

	val = rd32(hw, PFINT_OICR_ENA);
	val &= ~PFINT_OICR_TSYN_TX_M;
	wr32(hw, PFINT_OICR_ENA, val);

	ice_set_rx_tstamp(pf, false);
}

/**
 * ice_ptp_restore_timestamp_mode - Restore timestamp configuration
 * @pf: Board private structure
 *
 * Called at the end of rebuild to restore timestamp configuration after
 * a device reset.
 */
void ice_ptp_restore_timestamp_mode(struct ice_pf *pf)
{
	struct ice_hw *hw = &pf->hw;
	bool enable_rx;

	ice_ptp_cfg_tx_interrupt(pf);

	enable_rx = pf->ptp.tstamp_config.rx_filter == HWTSTAMP_FILTER_ALL;
	ice_set_rx_tstamp(pf, enable_rx);

	/* Trigger an immediate software interrupt to ensure that timestamps
	 * which occurred during reset are handled now.
	 */
	wr32(hw, PFINT_OICR, PFINT_OICR_TSYN_TX_M);
	ice_flush(hw);
}

/**
 * ice_ptp_read_src_clk_reg - Read the source clock register
 * @pf: Board private structure
 * @sts: Optional parameter for holding a pair of system timestamps from
 *       the system clock. Will be ignored if NULL is given.
 */
u64 ice_ptp_read_src_clk_reg(struct ice_pf *pf,
			     struct ptp_system_timestamp *sts)
{
	struct ice_hw *hw = &pf->hw;
	u32 hi, lo, lo2;
	u8 tmr_idx;

	if (!ice_is_primary(hw))
		hw = ice_get_primary_hw(pf);

	tmr_idx = ice_get_ptp_src_clock_index(hw);
	guard(spinlock)(&pf->adapter->ptp_gltsyn_time_lock);
	/* Read the system timestamp pre PHC read */
	ptp_read_system_prets(sts);

	if (hw->mac_type == ICE_MAC_E830) {
		u64 clk_time = rd64(hw, E830_GLTSYN_TIME_L(tmr_idx));

		/* Read the system timestamp post PHC read */
		ptp_read_system_postts(sts);

		return clk_time;
	}

	lo = rd32(hw, GLTSYN_TIME_L(tmr_idx));

	/* Read the system timestamp post PHC read */
	ptp_read_system_postts(sts);

	hi = rd32(hw, GLTSYN_TIME_H(tmr_idx));
	lo2 = rd32(hw, GLTSYN_TIME_L(tmr_idx));

	if (lo2 < lo) {
		/* if TIME_L rolled over read TIME_L again and update
		 * system timestamps
		 */
		ptp_read_system_prets(sts);
		lo = rd32(hw, GLTSYN_TIME_L(tmr_idx));
		ptp_read_system_postts(sts);
		hi = rd32(hw, GLTSYN_TIME_H(tmr_idx));
	}

	return ((u64)hi << 32) | lo;
}

/**
 * ice_ptp_extend_32b_ts - Convert a 32b nanoseconds timestamp to 64b
 * @cached_phc_time: recently cached copy of PHC time
 * @in_tstamp: Ingress/egress 32b nanoseconds timestamp value
 *
 * Hardware captures timestamps which contain only 32 bits of nominal
 * nanoseconds, as opposed to the 64bit timestamps that the stack expects.
 * Note that the captured timestamp values may be 40 bits, but the lower
 * 8 bits are sub-nanoseconds and generally discarded.
 *
 * Extend the 32bit nanosecond timestamp using the following algorithm and
 * assumptions:
 *
 * 1) have a recently cached copy of the PHC time
 * 2) assume that the in_tstamp was captured 2^31 nanoseconds (~2.1
 *    seconds) before or after the PHC time was captured.
 * 3) calculate the delta between the cached time and the timestamp
 * 4) if the delta is smaller than 2^31 nanoseconds, then the timestamp was
 *    captured after the PHC time. In this case, the full timestamp is just
 *    the cached PHC time plus the delta.
 * 5) otherwise, if the delta is larger than 2^31 nanoseconds, then the
 *    timestamp was captured *before* the PHC time, i.e. because the PHC
 *    cache was updated after the timestamp was captured by hardware. In this
 *    case, the full timestamp is the cached time minus the inverse delta.
 *
 * This algorithm works even if the PHC time was updated after a Tx timestamp
 * was requested, but before the Tx timestamp event was reported from
 * hardware.
 *
 * This calculation primarily relies on keeping the cached PHC time up to
 * date. If the timestamp was captured more than 2^31 nanoseconds after the
 * PHC time, it is possible that the lower 32bits of PHC time have
 * overflowed more than once, and we might generate an incorrect timestamp.
 *
 * This is prevented by (a) periodically updating the cached PHC time once
 * a second, and (b) discarding any Tx timestamp packet if it has waited for
 * a timestamp for more than one second.
 */
static u64 ice_ptp_extend_32b_ts(u64 cached_phc_time, u32 in_tstamp)
{
	u32 delta, phc_time_lo;
	u64 ns;

	/* Extract the lower 32 bits of the PHC time */
	phc_time_lo = (u32)cached_phc_time;

	/* Calculate the delta between the lower 32bits of the cached PHC
	 * time and the in_tstamp value
	 */
	delta = (in_tstamp - phc_time_lo);

	/* Do not assume that the in_tstamp is always more recent than the
	 * cached PHC time. If the delta is large, it indicates that the
	 * in_tstamp was taken in the past, and should be converted
	 * forward.
	 */
	if (delta > (U32_MAX / 2)) {
		/* reverse the delta calculation here */
		delta = (phc_time_lo - in_tstamp);
		ns = cached_phc_time - delta;
	} else {
		ns = cached_phc_time + delta;
	}

	return ns;
}

/**
 * ice_ptp_extend_40b_ts - Convert a 40b timestamp to 64b nanoseconds
 * @pf: Board private structure
 * @in_tstamp: Ingress/egress 40b timestamp value
 *
 * The Tx and Rx timestamps are 40 bits wide, including 32 bits of nominal
 * nanoseconds, 7 bits of sub-nanoseconds, and a valid bit.
 *
 *  *--------------------------------------------------------------*
 *  | 32 bits of nanoseconds | 7 high bits of sub ns underflow | v |
 *  *--------------------------------------------------------------*
 *
 * The low bit is an indicator of whether the timestamp is valid. The next
 * 7 bits are a capture of the upper 7 bits of the sub-nanosecond underflow,
 * and the remaining 32 bits are the lower 32 bits of the PHC timer.
 *
 * It is assumed that the caller verifies the timestamp is valid prior to
 * calling this function.
 *
 * Extract the 32bit nominal nanoseconds and extend them. Use the cached PHC
 * time stored in the device private PTP structure as the basis for timestamp
 * extension.
 *
 * See ice_ptp_extend_32b_ts for a detailed explanation of the extension
 * algorithm.
 */
static u64 ice_ptp_extend_40b_ts(struct ice_pf *pf, u64 in_tstamp)
{
	const u64 mask = GENMASK_ULL(31, 0);
	unsigned long discard_time;

	/* Discard the hardware timestamp if the cached PHC time is too old */
	discard_time = pf->ptp.cached_phc_jiffies + msecs_to_jiffies(2000);
	if (time_is_before_jiffies(discard_time)) {
		pf->ptp.tx_hwtstamp_discarded++;
		return 0;
	}

	return ice_ptp_extend_32b_ts(pf->ptp.cached_phc_time,
				     (in_tstamp >> 8) & mask);
}

/**
 * ice_ptp_is_tx_tracker_up - Check if Tx tracker is ready for new timestamps
 * @tx: the PTP Tx timestamp tracker to check
 *
 * Check that a given PTP Tx timestamp tracker is up, i.e. that it is ready
 * to accept new timestamp requests.
 *
 * Assumes the tx->lock spinlock is already held.
 */
static bool
ice_ptp_is_tx_tracker_up(struct ice_ptp_tx *tx)
{
	lockdep_assert_held(&tx->lock);

	return tx->init && !tx->calibrating;
}

/**
 * ice_ptp_req_tx_single_tstamp - Request Tx timestamp for a port from FW
 * @tx: the PTP Tx timestamp tracker
 * @idx: index of the timestamp to request
 */
void ice_ptp_req_tx_single_tstamp(struct ice_ptp_tx *tx, u8 idx)
{
	struct ice_e810_params *params;
	struct ice_ptp_port *ptp_port;
	unsigned long flags;
	struct sk_buff *skb;
	struct ice_pf *pf;

	if (!tx->init)
		return;

	ptp_port = container_of(tx, struct ice_ptp_port, tx);
	pf = ptp_port_to_pf(ptp_port);
	params = &pf->hw.ptp.phy.e810;

	/* Drop packets which have waited for more than 2 seconds */
	if (time_is_before_jiffies(tx->tstamps[idx].start + 2 * HZ)) {
		/* Count the number of Tx timestamps that timed out */
		pf->ptp.tx_hwtstamp_timeouts++;

		skb = tx->tstamps[idx].skb;
		tx->tstamps[idx].skb = NULL;
		clear_bit(idx, tx->in_use);

		dev_kfree_skb_any(skb);
		return;
	}

	ice_trace(tx_tstamp_fw_req, tx->tstamps[idx].skb, idx);

	spin_lock_irqsave(&params->atqbal_wq.lock, flags);

	params->atqbal_flags |= ATQBAL_FLAGS_INTR_IN_PROGRESS;

	/* Write TS index to read to the PF register so the FW can read it */
	wr32(&pf->hw, REG_LL_PROXY_H,
	     REG_LL_PROXY_H_TS_INTR_ENA | FIELD_PREP(REG_LL_PROXY_H_TS_IDX, idx) |
	     REG_LL_PROXY_H_EXEC);
	tx->last_ll_ts_idx_read = idx;

	spin_unlock_irqrestore(&params->atqbal_wq.lock, flags);
}

/**
 * ice_ptp_complete_tx_single_tstamp - Complete Tx timestamp for a port
 * @tx: the PTP Tx timestamp tracker
 */
void ice_ptp_complete_tx_single_tstamp(struct ice_ptp_tx *tx)
{
	struct skb_shared_hwtstamps shhwtstamps = {};
	u8 idx = tx->last_ll_ts_idx_read;
	struct ice_e810_params *params;
	struct ice_ptp_port *ptp_port;
	u64 raw_tstamp, tstamp;
	bool drop_ts = false;
	struct sk_buff *skb;
	unsigned long flags;
	struct device *dev;
	struct ice_pf *pf;
	u32 reg_ll_high;

	if (!tx->init || tx->last_ll_ts_idx_read < 0)
		return;

	ptp_port = container_of(tx, struct ice_ptp_port, tx);
	pf = ptp_port_to_pf(ptp_port);
	dev = ice_pf_to_dev(pf);
	params = &pf->hw.ptp.phy.e810;

	ice_trace(tx_tstamp_fw_done, tx->tstamps[idx].skb, idx);

	spin_lock_irqsave(&params->atqbal_wq.lock, flags);

	if (!(params->atqbal_flags & ATQBAL_FLAGS_INTR_IN_PROGRESS))
		dev_dbg(dev, "%s: low latency interrupt request not in progress?\n",
			__func__);

	/* Read the low 32 bit value */
	raw_tstamp = rd32(&pf->hw, REG_LL_PROXY_L);
	/* Read the status together with high TS part */
	reg_ll_high = rd32(&pf->hw, REG_LL_PROXY_H);

	/* Wake up threads waiting on low latency interface */
	params->atqbal_flags &= ~ATQBAL_FLAGS_INTR_IN_PROGRESS;

	wake_up_locked(&params->atqbal_wq);

	spin_unlock_irqrestore(&params->atqbal_wq.lock, flags);

	/* When the bit is cleared, the TS is ready in the register */
	if (reg_ll_high & REG_LL_PROXY_H_EXEC) {
		dev_err(ice_pf_to_dev(pf), "Failed to get the Tx tstamp - FW not ready");
		return;
	}

	/* High 8 bit value of the TS is on the bits 16:23 */
	raw_tstamp |= ((u64)FIELD_GET(REG_LL_PROXY_H_TS_HIGH, reg_ll_high)) << 32;

	/* Devices using this interface always verify the timestamp differs
	 * relative to the last cached timestamp value.
	 */
	if (raw_tstamp == tx->tstamps[idx].cached_tstamp)
		return;

	tx->tstamps[idx].cached_tstamp = raw_tstamp;
	clear_bit(idx, tx->in_use);
	skb = tx->tstamps[idx].skb;
	tx->tstamps[idx].skb = NULL;
	if (test_and_clear_bit(idx, tx->stale))
		drop_ts = true;

	if (!skb)
		return;

	if (drop_ts) {
		dev_kfree_skb_any(skb);
		return;
	}

	/* Extend the timestamp using cached PHC time */
	tstamp = ice_ptp_extend_40b_ts(pf, raw_tstamp);
	if (tstamp) {
		shhwtstamps.hwtstamp = ns_to_ktime(tstamp);
		ice_trace(tx_tstamp_complete, skb, idx);

		/* Count the number of Tx timestamps that succeeded */
		pf->ptp.tx_hwtstamp_good++;
	}

	skb_tstamp_tx(skb, &shhwtstamps);
	dev_kfree_skb_any(skb);
}

/**
 * ice_ptp_process_tx_tstamp - Process Tx timestamps for a port
 * @tx: the PTP Tx timestamp tracker
 *
 * Process timestamps captured by the PHY associated with this port. To do
 * this, loop over each index with a waiting skb.
 *
 * If a given index has a valid timestamp, perform the following steps:
 *
 * 1) check that the timestamp request is not stale
 * 2) check that a timestamp is ready and available in the PHY memory bank
 * 3) read and copy the timestamp out of the PHY register
 * 4) unlock the index by clearing the associated in_use bit
 * 5) check if the timestamp is stale, and discard if so
 * 6) extend the 40 bit timestamp value to get a 64 bit timestamp value
 * 7) send this 64 bit timestamp to the stack
 *
 * Note that we do not hold the tracking lock while reading the Tx timestamp.
 * This is because reading the timestamp requires taking a mutex that might
 * sleep.
 *
 * The only place where we set in_use is when a new timestamp is initiated
 * with a slot index. This is only called in the hard xmit routine where an
 * SKB has a request flag set. The only places where we clear this bit is this
 * function, or during teardown when the Tx timestamp tracker is being
 * removed. A timestamp index will never be re-used until the in_use bit for
 * that index is cleared.
 *
 * If a Tx thread starts a new timestamp, we might not begin processing it
 * right away but we will notice it at the end when we re-queue the task.
 *
 * If a Tx thread starts a new timestamp just after this function exits, the
 * interrupt for that timestamp should re-trigger this function once
 * a timestamp is ready.
 *
 * In cases where the PTP hardware clock was directly adjusted, some
 * timestamps may not be able to safely use the timestamp extension math. In
 * this case, software will set the stale bit for any outstanding Tx
 * timestamps when the clock is adjusted. Then this function will discard
 * those captured timestamps instead of sending them to the stack.
 *
 * If a Tx packet has been waiting for more than 2 seconds, it is not possible
 * to correctly extend the timestamp using the cached PHC time. It is
 * extremely unlikely that a packet will ever take this long to timestamp. If
 * we detect a Tx timestamp request that has waited for this long we assume
 * the packet will never be sent by hardware and discard it without reading
 * the timestamp register.
 */
static void ice_ptp_process_tx_tstamp(struct ice_ptp_tx *tx)
{
	struct ice_ptp_port *ptp_port;
	unsigned long flags;
	u32 tstamp_good = 0;
	struct ice_pf *pf;
	struct ice_hw *hw;
	u64 tstamp_ready;
	bool link_up;
	int err;
	u8 idx;

	ptp_port = container_of(tx, struct ice_ptp_port, tx);
	pf = ptp_port_to_pf(ptp_port);
	hw = &pf->hw;

	if (!tx->init)
		return;

	/* Read the Tx ready status first */
	if (tx->has_ready_bitmap) {
		err = ice_get_phy_tx_tstamp_ready(hw, tx->block, &tstamp_ready);
		if (err)
			return;
	}

	/* Drop packets if the link went down */
	link_up = ptp_port->link_up;

	for_each_set_bit(idx, tx->in_use, tx->len) {
		struct skb_shared_hwtstamps shhwtstamps = {};
		u8 phy_idx = idx + tx->offset;
		u64 raw_tstamp = 0, tstamp;
		bool drop_ts = !link_up;
		struct sk_buff *skb;

		/* Drop packets which have waited for more than 2 seconds */
		if (time_is_before_jiffies(tx->tstamps[idx].start + 2 * HZ)) {
			drop_ts = true;

			/* Count the number of Tx timestamps that timed out */
			pf->ptp.tx_hwtstamp_timeouts++;
		}

		/* Only read a timestamp from the PHY if its marked as ready
		 * by the tstamp_ready register. This avoids unnecessary
		 * reading of timestamps which are not yet valid. This is
		 * important as we must read all timestamps which are valid
		 * and only timestamps which are valid during each interrupt.
		 * If we do not, the hardware logic for generating a new
		 * interrupt can get stuck on some devices.
		 */
		if (tx->has_ready_bitmap &&
		    !(tstamp_ready & BIT_ULL(phy_idx))) {
			if (drop_ts)
				goto skip_ts_read;

			continue;
		}

		ice_trace(tx_tstamp_fw_req, tx->tstamps[idx].skb, idx);

		err = ice_read_phy_tstamp(hw, tx->block, phy_idx, &raw_tstamp);
		if (err && !drop_ts)
			continue;

		ice_trace(tx_tstamp_fw_done, tx->tstamps[idx].skb, idx);

		/* For PHYs which don't implement a proper timestamp ready
		 * bitmap, verify that the timestamp value is different
		 * from the last cached timestamp. If it is not, skip this for
		 * now assuming it hasn't yet been captured by hardware.
		 */
		if (!drop_ts && !tx->has_ready_bitmap &&
		    raw_tstamp == tx->tstamps[idx].cached_tstamp)
			continue;

		/* Discard any timestamp value without the valid bit set */
		if (!(raw_tstamp & ICE_PTP_TS_VALID))
			drop_ts = true;

skip_ts_read:
		spin_lock_irqsave(&tx->lock, flags);
		if (!tx->has_ready_bitmap && raw_tstamp)
			tx->tstamps[idx].cached_tstamp = raw_tstamp;
		clear_bit(idx, tx->in_use);
		skb = tx->tstamps[idx].skb;
		tx->tstamps[idx].skb = NULL;
		if (test_and_clear_bit(idx, tx->stale))
			drop_ts = true;
		spin_unlock_irqrestore(&tx->lock, flags);

		/* It is unlikely but possible that the SKB will have been
		 * flushed at this point due to link change or teardown.
		 */
		if (!skb)
			continue;

		if (drop_ts) {
			dev_kfree_skb_any(skb);
			continue;
		}

		/* Extend the timestamp using cached PHC time */
		tstamp = ice_ptp_extend_40b_ts(pf, raw_tstamp);
		if (tstamp) {
			shhwtstamps.hwtstamp = ns_to_ktime(tstamp);
			ice_trace(tx_tstamp_complete, skb, idx);

			/* Count the number of Tx timestamps that succeeded */
			tstamp_good++;
		}

		skb_tstamp_tx(skb, &shhwtstamps);
		dev_kfree_skb_any(skb);
	}

	pf->ptp.tx_hwtstamp_good += tstamp_good;
}

static void ice_ptp_tx_tstamp_owner(struct ice_pf *pf)
{
	struct ice_ptp_port *port;

	mutex_lock(&pf->adapter->ports.lock);
	list_for_each_entry(port, &pf->adapter->ports.ports, list_node) {
		struct ice_ptp_tx *tx = &port->tx;

		if (!tx || !tx->init)
			continue;

		ice_ptp_process_tx_tstamp(tx);
	}
	mutex_unlock(&pf->adapter->ports.lock);
}

/**
 * ice_ptp_alloc_tx_tracker - Initialize tracking for Tx timestamps
 * @tx: Tx tracking structure to initialize
 *
 * Assumes that the length has already been initialized. Do not call directly,
 * use the ice_ptp_init_tx_* instead.
 */
static int
ice_ptp_alloc_tx_tracker(struct ice_ptp_tx *tx)
{
	unsigned long *in_use, *stale;
	struct ice_tx_tstamp *tstamps;

	tstamps = kzalloc_objs(*tstamps, tx->len);
	in_use = bitmap_zalloc(tx->len, GFP_KERNEL);
	stale = bitmap_zalloc(tx->len, GFP_KERNEL);

	if (!tstamps || !in_use || !stale) {
		kfree(tstamps);
		bitmap_free(in_use);
		bitmap_free(stale);

		return -ENOMEM;
	}

	tx->tstamps = tstamps;
	tx->in_use = in_use;
	tx->stale = stale;
	tx->init = 1;
	tx->last_ll_ts_idx_read = -1;

	spin_lock_init(&tx->lock);

	return 0;
}

/**
 * ice_ptp_flush_tx_tracker - Flush any remaining timestamps from the tracker
 * @pf: Board private structure
 * @tx: the tracker to flush
 *
 * Called during teardown when a Tx tracker is being removed.
 */
static void
ice_ptp_flush_tx_tracker(struct ice_pf *pf, struct ice_ptp_tx *tx)
{
	struct ice_hw *hw = &pf->hw;
	unsigned long flags;
	u64 tstamp_ready;
	int err;
	u8 idx;

	err = ice_get_phy_tx_tstamp_ready(hw, tx->block, &tstamp_ready);
	if (err) {
		dev_dbg(ice_pf_to_dev(pf), "Failed to get the Tx tstamp ready bitmap for block %u, err %d\n",
			tx->block, err);

		/* If we fail to read the Tx timestamp ready bitmap just
		 * skip clearing the PHY timestamps.
		 */
		tstamp_ready = 0;
	}

	for_each_set_bit(idx, tx->in_use, tx->len) {
		u8 phy_idx = idx + tx->offset;
		struct sk_buff *skb;

		/* In case this timestamp is ready, we need to clear it. */
		if (!hw->reset_ongoing && (tstamp_ready & BIT_ULL(phy_idx)))
			ice_clear_phy_tstamp(hw, tx->block, phy_idx);

		spin_lock_irqsave(&tx->lock, flags);
		skb = tx->tstamps[idx].skb;
		tx->tstamps[idx].skb = NULL;
		clear_bit(idx, tx->in_use);
		clear_bit(idx, tx->stale);
		spin_unlock_irqrestore(&tx->lock, flags);

		/* Count the number of Tx timestamps flushed */
		pf->ptp.tx_hwtstamp_flushed++;

		/* Free the SKB after we've cleared the bit */
		dev_kfree_skb_any(skb);
	}
}

/**
 * ice_ptp_mark_tx_tracker_stale - Mark unfinished timestamps as stale
 * @tx: the tracker to mark
 *
 * Mark currently outstanding Tx timestamps as stale. This prevents sending
 * their timestamp value to the stack. This is required to prevent extending
 * the 40bit hardware timestamp incorrectly.
 *
 * This should be called when the PTP clock is modified such as after a set
 * time request.
 */
static void
ice_ptp_mark_tx_tracker_stale(struct ice_ptp_tx *tx)
{
	unsigned long flags;

	spin_lock_irqsave(&tx->lock, flags);
	bitmap_or(tx->stale, tx->stale, tx->in_use, tx->len);
	spin_unlock_irqrestore(&tx->lock, flags);
}

/**
 * ice_ptp_flush_all_tx_tracker - Flush all timestamp trackers on this clock
 * @pf: Board private structure
 *
 * Called by the clock owner to flush all the Tx timestamp trackers associated
 * with the clock.
 */
static void
ice_ptp_flush_all_tx_tracker(struct ice_pf *pf)
{
	struct ice_ptp_port *port;

	list_for_each_entry(port, &pf->adapter->ports.ports, list_node)
		ice_ptp_flush_tx_tracker(ptp_port_to_pf(port), &port->tx);
}

/**
 * ice_ptp_release_tx_tracker - Release allocated memory for Tx tracker
 * @pf: Board private structure
 * @tx: Tx tracking structure to release
 *
 * Free memory associated with the Tx timestamp tracker.
 */
static void
ice_ptp_release_tx_tracker(struct ice_pf *pf, struct ice_ptp_tx *tx)
{
	unsigned long flags;

	spin_lock_irqsave(&tx->lock, flags);
	tx->init = 0;
	spin_unlock_irqrestore(&tx->lock, flags);

	/* wait for potentially outstanding interrupt to complete */
	synchronize_irq(pf->oicr_irq.virq);

	ice_ptp_flush_tx_tracker(pf, tx);

	kfree(tx->tstamps);
	tx->tstamps = NULL;

	bitmap_free(tx->in_use);
	tx->in_use = NULL;

	bitmap_free(tx->stale);
	tx->stale = NULL;

	tx->len = 0;
}

/**
 * ice_ptp_init_tx_e82x - Initialize tracking for Tx timestamps
 * @pf: Board private structure
 * @tx: the Tx tracking structure to initialize
 * @port: the port this structure tracks
 *
 * Initialize the Tx timestamp tracker for this port. For generic MAC devices,
 * the timestamp block is shared for all ports in the same quad. To avoid
 * ports using the same timestamp index, logically break the block of
 * registers into chunks based on the port number.
 *
 * Return: 0 on success, -ENOMEM when out of memory
 */
static int ice_ptp_init_tx_e82x(struct ice_pf *pf, struct ice_ptp_tx *tx,
				u8 port)
{
	tx->block = ICE_GET_QUAD_NUM(port);
	tx->offset = (port % ICE_PORTS_PER_QUAD) * INDEX_PER_PORT_E82X;
	tx->len = INDEX_PER_PORT_E82X;
	tx->has_ready_bitmap = 1;

	return ice_ptp_alloc_tx_tracker(tx);
}

/**
 * ice_ptp_init_tx - Initialize tracking for Tx timestamps
 * @pf: Board private structure
 * @tx: the Tx tracking structure to initialize
 * @port: the port this structure tracks
 *
 * Initialize the Tx timestamp tracker for this PF. For all PHYs except E82X,
 * each port has its own block of timestamps, independent of the other ports.
 *
 * Return: 0 on success, -ENOMEM when out of memory
 */
static int ice_ptp_init_tx(struct ice_pf *pf, struct ice_ptp_tx *tx, u8 port)
{
	tx->block = port;
	tx->offset = 0;
	tx->len = INDEX_PER_PORT;

	/* The E810 PHY does not provide a timestamp ready bitmap. Instead,
	 * verify new timestamps against cached copy of the last read
	 * timestamp.
	 */
	tx->has_ready_bitmap = pf->hw.mac_type != ICE_MAC_E810;

	return ice_ptp_alloc_tx_tracker(tx);
}

/**
 * ice_ptp_update_cached_phctime - Update the cached PHC time values
 * @pf: Board specific private structure
 *
 * This function updates the system time values which are cached in the PF
 * structure and the Rx rings.
 *
 * This function must be called periodically to ensure that the cached value
 * is never more than 2 seconds old.
 *
 * Note that the cached copy in the PF PTP structure is always updated, even
 * if we can't update the copy in the Rx rings.
 *
 * Return:
 * * 0 - OK, successfully updated
 * * -EAGAIN - PF was busy, need to reschedule the update
 */
static int ice_ptp_update_cached_phctime(struct ice_pf *pf)
{
	struct device *dev = ice_pf_to_dev(pf);
	unsigned long update_before;
	u64 systime;
	int i;

	update_before = pf->ptp.cached_phc_jiffies + msecs_to_jiffies(2000);
	if (pf->ptp.cached_phc_time &&
	    time_is_before_jiffies(update_before)) {
		unsigned long time_taken = jiffies - pf->ptp.cached_phc_jiffies;

		dev_warn(dev, "%u msecs passed between update to cached PHC time\n",
			 jiffies_to_msecs(time_taken));
		pf->ptp.late_cached_phc_updates++;
	}

	/* Read the current PHC time */
	systime = ice_ptp_read_src_clk_reg(pf, NULL);

	/* Update the cached PHC time stored in the PF structure */
	WRITE_ONCE(pf->ptp.cached_phc_time, systime);
	WRITE_ONCE(pf->ptp.cached_phc_jiffies, jiffies);

	if (test_and_set_bit(ICE_CFG_BUSY, pf->state))
		return -EAGAIN;

	ice_for_each_vsi(pf, i) {
		struct ice_vsi *vsi = pf->vsi[i];
		int j;

		if (!vsi)
			continue;

		if (vsi->type != ICE_VSI_PF)
			continue;

		ice_for_each_rxq(vsi, j) {
			if (!vsi->rx_rings[j])
				continue;
			WRITE_ONCE(vsi->rx_rings[j]->cached_phctime, systime);
		}
	}
	clear_bit(ICE_CFG_BUSY, pf->state);

	return 0;
}

/**
 * ice_ptp_reset_cached_phctime - Reset cached PHC time after an update
 * @pf: Board specific private structure
 *
 * This function must be called when the cached PHC time is no longer valid,
 * such as after a time adjustment. It marks any currently outstanding Tx
 * timestamps as stale and updates the cached PHC time for both the PF and Rx
 * rings.
 *
 * If updating the PHC time cannot be done immediately, a warning message is
 * logged and the work item is scheduled immediately to minimize the window
 * with a wrong cached timestamp.
 */
static void ice_ptp_reset_cached_phctime(struct ice_pf *pf)
{
	struct device *dev = ice_pf_to_dev(pf);
	int err;

	/* Update the cached PHC time immediately if possible, otherwise
	 * schedule the work item to execute soon.
	 */
	err = ice_ptp_update_cached_phctime(pf);
	if (err) {
		/* If another thread is updating the Rx rings, we won't
		 * properly reset them here. This could lead to reporting of
		 * invalid timestamps, but there isn't much we can do.
		 */
		dev_warn(dev, "%s: ICE_CFG_BUSY, unable to immediately update cached PHC time\n",
			 __func__);

		/* Queue the work item to update the Rx rings when possible */
		kthread_queue_delayed_work(pf->ptp.kworker, &pf->ptp.work,
					   msecs_to_jiffies(10));
	}

	/* Mark any outstanding timestamps as stale, since they might have
	 * been captured in hardware before the time update. This could lead
	 * to us extending them with the wrong cached value resulting in
	 * incorrect timestamp values.
	 */
	ice_ptp_mark_tx_tracker_stale(&pf->ptp.port.tx);
}

/**
 * ice_ptp_write_init - Set PHC time to provided value
 * @pf: Board private structure
 * @ts: timespec structure that holds the new time value
 *
 * Set the PHC time to the specified time provided in the timespec.
 */
static int ice_ptp_write_init(struct ice_pf *pf, struct timespec64 *ts)
{
	u64 ns = timespec64_to_ns(ts);
	struct ice_hw *hw = &pf->hw;

	return ice_ptp_init_time(hw, ns);
}

/**
 * ice_ptp_write_adj - Adjust PHC clock time atomically
 * @pf: Board private structure
 * @adj: Adjustment in nanoseconds
 *
 * Perform an atomic adjustment of the PHC time by the specified number of
 * nanoseconds.
 */
static int ice_ptp_write_adj(struct ice_pf *pf, s32 adj)
{
	struct ice_hw *hw = &pf->hw;

	return ice_ptp_adj_clock(hw, adj);
}

/**
 * ice_base_incval - Get base timer increment value
 * @pf: Board private structure
 *
 * Look up the base timer increment value for this device. The base increment
 * value is used to define the nominal clock tick rate. This increment value
 * is programmed during device initialization. It is also used as the basis
 * for calculating adjustments using scaled_ppm.
 */
static u64 ice_base_incval(struct ice_pf *pf)
{
	struct ice_hw *hw = &pf->hw;
	u64 incval;

	incval = ice_get_base_incval(hw);

	dev_dbg(ice_pf_to_dev(pf), "PTP: using base increment value of 0x%016llx\n",
		incval);

	return incval;
}

/**
 * ice_ptp_check_tx_fifo - Check whether Tx FIFO is in an OK state
 * @port: PTP port for which Tx FIFO is checked
 */
static int ice_ptp_check_tx_fifo(struct ice_ptp_port *port)
{
	int offs = port->port_num % ICE_PORTS_PER_QUAD;
	int quad = ICE_GET_QUAD_NUM(port->port_num);
	struct ice_pf *pf;
	struct ice_hw *hw;
	u32 val, phy_sts;
	int err;

	pf = ptp_port_to_pf(port);
	hw = &pf->hw;

	if (port->tx_fifo_busy_cnt == FIFO_OK)
		return 0;

	/* need to read FIFO state */
	if (offs == 0 || offs == 1)
		err = ice_read_quad_reg_e82x(hw, quad, Q_REG_FIFO01_STATUS,
					     &val);
	else
		err = ice_read_quad_reg_e82x(hw, quad, Q_REG_FIFO23_STATUS,
					     &val);

	if (err) {
		dev_err(ice_pf_to_dev(pf), "PTP failed to check port %d Tx FIFO, err %d\n",
			port->port_num, err);
		return err;
	}

	if (offs & 0x1)
		phy_sts = FIELD_GET(Q_REG_FIFO13_M, val);
	else
		phy_sts = FIELD_GET(Q_REG_FIFO02_M, val);

	if (phy_sts & FIFO_EMPTY) {
		port->tx_fifo_busy_cnt = FIFO_OK;
		return 0;
	}

	port->tx_fifo_busy_cnt++;

	dev_dbg(ice_pf_to_dev(pf), "Try %d, port %d FIFO not empty\n",
		port->tx_fifo_busy_cnt, port->port_num);

	if (port->tx_fifo_busy_cnt == ICE_PTP_FIFO_NUM_CHECKS) {
		dev_dbg(ice_pf_to_dev(pf),
			"Port %d Tx FIFO still not empty; resetting quad %d\n",
			port->port_num, quad);
		ice_ptp_reset_ts_memory_quad_e82x(hw, quad);
		port->tx_fifo_busy_cnt = FIFO_OK;
		return 0;
	}

	return -EAGAIN;
}

/**
 * ice_ptp_wait_for_offsets - Check for valid Tx and Rx offsets
 * @work: Pointer to the kthread_work structure for this task
 *
 * Check whether hardware has completed measuring the Tx and Rx offset values
 * used to configure and enable vernier timestamp calibration.
 *
 * Once the offset in either direction is measured, configure the associated
 * registers with the calibrated offset values and enable timestamping. The Tx
 * and Rx directions are configured independently as soon as their associated
 * offsets are known.
 *
 * This function reschedules itself until both Tx and Rx calibration have
 * completed.
 */
static void ice_ptp_wait_for_offsets(struct kthread_work *work)
{
	struct ice_ptp_port *port;
	struct ice_pf *pf;
	struct ice_hw *hw;
	int tx_err;
	int rx_err;

	port = container_of(work, struct ice_ptp_port, ov_work.work);
	pf = ptp_port_to_pf(port);
	hw = &pf->hw;

	if (ice_is_reset_in_progress(pf->state)) {
		/* wait for device driver to complete reset */
		kthread_queue_delayed_work(pf->ptp.kworker,
					   &port->ov_work,
					   msecs_to_jiffies(100));
		return;
	}

	tx_err = ice_ptp_check_tx_fifo(port);
	if (!tx_err)
		tx_err = ice_phy_cfg_tx_offset_e82x(hw, port->port_num);
	rx_err = ice_phy_cfg_rx_offset_e82x(hw, port->port_num);
	if (tx_err || rx_err) {
		/* Tx and/or Rx offset not yet configured, try again later */
		kthread_queue_delayed_work(pf->ptp.kworker,
					   &port->ov_work,
					   msecs_to_jiffies(100));
		return;
	}
}

/**
 * ice_ptp_port_phy_stop - Stop timestamping for a PHY port
 * @ptp_port: PTP port to stop
 */
static int
ice_ptp_port_phy_stop(struct ice_ptp_port *ptp_port)
{
	struct ice_pf *pf = ptp_port_to_pf(ptp_port);
	u8 port = ptp_port->port_num;
	struct ice_hw *hw = &pf->hw;
	int err;

	mutex_lock(&ptp_port->ps_lock);

	switch (hw->mac_type) {
	case ICE_MAC_E810:
	case ICE_MAC_E830:
		err = 0;
		break;
	case ICE_MAC_GENERIC:
		kthread_cancel_delayed_work_sync(&ptp_port->ov_work);

		err = ice_stop_phy_timer_e82x(hw, port, true);
		break;
	case ICE_MAC_GENERIC_3K_E825:
		err = ice_stop_phy_timer_eth56g(hw, port, true);
		break;
	default:
		err = -ENODEV;
	}
	if (err && err != -EBUSY)
		dev_err(ice_pf_to_dev(pf), "PTP failed to set PHY port %d down, err %d\n",
			port, err);

	mutex_unlock(&ptp_port->ps_lock);

	return err;
}

/**
 * ice_ptp_port_phy_restart - (Re)start and calibrate PHY timestamping
 * @ptp_port: PTP port for which the PHY start is set
 *
 * Start the PHY timestamping block, and initiate Vernier timestamping
 * calibration. If timestamping cannot be calibrated (such as if link is down)
 * then disable the timestamping block instead.
 */
static int
ice_ptp_port_phy_restart(struct ice_ptp_port *ptp_port)
{
	struct ice_pf *pf = ptp_port_to_pf(ptp_port);
	u8 port = ptp_port->port_num;
	struct ice_hw *hw = &pf->hw;
	unsigned long flags;
	int err;

	if (!ptp_port->link_up)
		return ice_ptp_port_phy_stop(ptp_port);

	mutex_lock(&ptp_port->ps_lock);

	switch (hw->mac_type) {
	case ICE_MAC_E810:
	case ICE_MAC_E830:
		err = 0;
		break;
	case ICE_MAC_GENERIC:
		/* Start the PHY timer in Vernier mode */
		kthread_cancel_delayed_work_sync(&ptp_port->ov_work);

		/* temporarily disable Tx timestamps while calibrating
		 * PHY offset
		 */
		spin_lock_irqsave(&ptp_port->tx.lock, flags);
		ptp_port->tx.calibrating = true;
		spin_unlock_irqrestore(&ptp_port->tx.lock, flags);
		ptp_port->tx_fifo_busy_cnt = 0;

		/* Start the PHY timer in Vernier mode */
		err = ice_start_phy_timer_e82x(hw, port);
		if (err)
			break;

		/* Enable Tx timestamps right away */
		spin_lock_irqsave(&ptp_port->tx.lock, flags);
		ptp_port->tx.calibrating = false;
		spin_unlock_irqrestore(&ptp_port->tx.lock, flags);

		kthread_queue_delayed_work(pf->ptp.kworker, &ptp_port->ov_work,
					   0);
		break;
	case ICE_MAC_GENERIC_3K_E825:
		err = ice_start_phy_timer_eth56g(hw, port);
		break;
	default:
		err = -ENODEV;
	}

	if (err)
		dev_err(ice_pf_to_dev(pf), "PTP failed to set PHY port %d up, err %d\n",
			port, err);

	mutex_unlock(&ptp_port->ps_lock);

	return err;
}

/**
 * ice_ptp_link_change - Reconfigure PTP after link status change
 * @pf: Board private structure
 * @linkup: Link is up or down
 */
void ice_ptp_link_change(struct ice_pf *pf, bool linkup)
{
	struct ice_ptp_port *ptp_port;
	struct ice_hw *hw = &pf->hw;

	if (pf->ptp.state != ICE_PTP_READY)
		return;

	ptp_port = &pf->ptp.port;

	/* Update cached link status for this port immediately */
	ptp_port->link_up = linkup;

	/* Skip HW writes if reset is in progress */
	if (pf->hw.reset_ongoing)
		return;

	if (hw->mac_type == ICE_MAC_GENERIC_3K_E825 &&
	    test_bit(ICE_FLAG_DPLL, pf->flags)) {
		int pin, err;

		mutex_lock(&pf->dplls.lock);
		for (pin = 0; pin < ICE_SYNCE_CLK_NUM; pin++) {
			enum ice_synce_clk clk_pin;
			bool active;
			u8 port_num;

			port_num = ptp_port->port_num;
			clk_pin = (enum ice_synce_clk)pin;
			err = ice_tspll_bypass_mux_active_e825c(hw,
								port_num,
								&active,
								clk_pin);
			if (err) {
				dev_err_once(ice_pf_to_dev(pf),
					     "Failed to read SyncE bypass mux for pin %d, err %d\n",
					     pin, err);
				break;
			}

			err = ice_tspll_cfg_synce_ethdiv_e825c(hw, clk_pin);
			if (active && err) {
				dev_err_once(ice_pf_to_dev(pf),
					     "Failed to configure SyncE ETH divider for pin %d, err %d\n",
					     pin, err);
				break;
			}
		}
		mutex_unlock(&pf->dplls.lock);
	}

	switch (hw->mac_type) {
	case ICE_MAC_E810:
	case ICE_MAC_E830:
		/* Do not reconfigure E810 or E830 PHY */
		return;
	case ICE_MAC_GENERIC:
		ice_ptp_port_phy_restart(ptp_port);
		return;
	case ICE_MAC_GENERIC_3K_E825:
		if (linkup)
			ice_ptp_port_phy_restart(ptp_port);
		return;
	default:
		dev_warn(ice_pf_to_dev(pf), "%s: Unknown PHY type\n", __func__);
	}
}

/**
 * ice_ptp_cfg_phy_interrupt - Configure PHY interrupt settings
 * @pf: PF private structure
 * @ena: bool value to enable or disable interrupt
 * @threshold: Minimum number of packets at which intr is triggered
 *
 * Utility function to configure all the PHY interrupt settings, including
 * whether the PHY interrupt is enabled, and what threshold to use. Also
 * configures The E82X timestamp owner to react to interrupts from all PHYs.
 *
 * Return: 0 on success, -EOPNOTSUPP when PHY model incorrect, other error codes
 * when failed to configure PHY interrupt for E82X
 */
static int ice_ptp_cfg_phy_interrupt(struct ice_pf *pf, bool ena, u32 threshold)
{
	struct device *dev = ice_pf_to_dev(pf);
	struct ice_hw *hw = &pf->hw;

	ice_ptp_reset_ts_memory(hw);

	switch (hw->mac_type) {
	case ICE_MAC_E810:
	case ICE_MAC_E830:
		return 0;
	case ICE_MAC_GENERIC: {
		int quad;

		for (quad = 0; quad < ICE_GET_QUAD_NUM(hw->ptp.num_lports);
		     quad++) {
			int err;

			err = ice_phy_cfg_intr_e82x(hw, quad, ena, threshold);
			if (err) {
				dev_err(dev, "Failed to configure PHY interrupt for quad %d, err %d\n",
					quad, err);
				return err;
			}
		}

		return 0;
	}
	case ICE_MAC_GENERIC_3K_E825: {
		int port;

		for (port = 0; port < hw->ptp.num_lports; port++) {
			int err;

			err = ice_phy_cfg_intr_eth56g(hw, port, ena, threshold);
			if (err) {
				dev_err(dev, "Failed to configure PHY interrupt for port %d, err %d\n",
					port, err);
				return err;
			}
		}

		return 0;
	}
	case ICE_MAC_UNKNOWN:
	default:
		return -EOPNOTSUPP;
	}
}

/**
 * ice_ptp_reset_phy_timestamping - Reset PHY timestamping block
 * @pf: Board private structure
 */
static void ice_ptp_reset_phy_timestamping(struct ice_pf *pf)
{
	ice_ptp_port_phy_restart(&pf->ptp.port);
}

/**
 * ice_ptp_restart_all_phy - Restart all PHYs to recalibrate timestamping
 * @pf: Board private structure
 */
static void ice_ptp_restart_all_phy(struct ice_pf *pf)
{
	struct list_head *entry;

	list_for_each(entry, &pf->adapter->ports.ports) {
		struct ice_ptp_port *port = list_entry(entry,
						       struct ice_ptp_port,
						       list_node);

		if (port->link_up)
			ice_ptp_port_phy_restart(port);
	}
}

/**
 * ice_ptp_adjfine - Adjust clock increment rate
 * @info: the driver's PTP info structure
 * @scaled_ppm: Parts per million with 16-bit fractional field
 *
 * Adjust the frequency of the clock by the indicated scaled ppm from the
 * base frequency.
 */
static int ice_ptp_adjfine(struct ptp_clock_info *info, long scaled_ppm)
{
	struct ice_pf *pf = ptp_info_to_pf(info);
	struct ice_hw *hw = &pf->hw;
	u64 incval;
	int err;

	incval = adjust_by_scaled_ppm(ice_base_incval(pf), scaled_ppm);
	err = ice_ptp_write_incval_locked(hw, incval);
	if (err) {
		dev_err(ice_pf_to_dev(pf), "PTP failed to set incval, err %d\n",
			err);
		return -EIO;
	}

	return 0;
}

/**
 * ice_ptp_extts_event - Process PTP external clock event
 * @pf: Board private structure
 */
void ice_ptp_extts_event(struct ice_pf *pf)
{
	struct ptp_clock_event event;
	struct ice_hw *hw = &pf->hw;
	u8 chan, tmr_idx;
	u32 hi, lo;

	/* Don't process timestamp events if PTP is not ready */
	if (pf->ptp.state != ICE_PTP_READY)
		return;

	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
	/* Event time is captured by one of the two matched registers
	 *      GLTSYN_EVNT_L: 32 LSB of sampled time event
	 *      GLTSYN_EVNT_H: 32 MSB of sampled time event
	 * Event is defined in GLTSYN_EVNT_0 register
	 */
	for (chan = 0; chan < GLTSYN_EVNT_H_IDX_MAX; chan++) {
		int pin_desc_idx;

		/* Check if channel is enabled */
		if (!(pf->ptp.ext_ts_irq & (1 << chan)))
			continue;

		lo = rd32(hw, GLTSYN_EVNT_L(chan, tmr_idx));
		hi = rd32(hw, GLTSYN_EVNT_H(chan, tmr_idx));
		event.timestamp = (u64)hi << 32 | lo;

		/* Add delay compensation */
		pin_desc_idx = ice_ptp_find_pin_idx(pf, PTP_PF_EXTTS, chan);
		if (pin_desc_idx >= 0) {
			const struct ice_ptp_pin_desc *desc;

			desc = &pf->ptp.ice_pin_desc[pin_desc_idx];
			event.timestamp -= desc->delay[0];
		}

		event.type = PTP_CLOCK_EXTTS;
		event.index = chan;
		pf->ptp.ext_ts_irq &= ~(1 << chan);
		ptp_clock_event(pf->ptp.clock, &event);
	}
}

/**
 * ice_ptp_cfg_extts - Configure EXTTS pin and channel
 * @pf: Board private structure
 * @rq: External timestamp request
 * @on: Enable/disable flag
 *
 * Configure an external timestamp event on the requested channel.
 *
 * Return: 0 on success, negative error code otherwise
 */
static int ice_ptp_cfg_extts(struct ice_pf *pf, struct ptp_extts_request *rq,
			     int on)
{
	u32 aux_reg, gpio_reg, irq_reg;
	struct ice_hw *hw = &pf->hw;
	unsigned int chan, gpio_pin;
	int pin_desc_idx;
	u8 tmr_idx;

	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
	chan = rq->index;

	pin_desc_idx = ice_ptp_find_pin_idx(pf, PTP_PF_EXTTS, chan);
	if (pin_desc_idx < 0)
		return -EIO;

	gpio_pin = pf->ptp.ice_pin_desc[pin_desc_idx].gpio[0];
	irq_reg = rd32(hw, PFINT_OICR_ENA);

	if (on) {
		/* Enable the interrupt */
		irq_reg |= PFINT_OICR_TSYN_EVNT_M;
		aux_reg = GLTSYN_AUX_IN_0_INT_ENA_M;

#define GLTSYN_AUX_IN_0_EVNTLVL_RISING_EDGE	BIT(0)
#define GLTSYN_AUX_IN_0_EVNTLVL_FALLING_EDGE	BIT(1)

		/* set event level to requested edge */
		if (rq->flags & PTP_FALLING_EDGE)
			aux_reg |= GLTSYN_AUX_IN_0_EVNTLVL_FALLING_EDGE;
		if (rq->flags & PTP_RISING_EDGE)
			aux_reg |= GLTSYN_AUX_IN_0_EVNTLVL_RISING_EDGE;

		/* Write GPIO CTL reg.
		 * 0x1 is input sampled by EVENT register(channel)
		 * + num_in_channels * tmr_idx
		 */
		gpio_reg = FIELD_PREP(GLGEN_GPIO_CTL_PIN_FUNC_M,
				      1 + chan + (tmr_idx * 3));
	} else {
		bool last_enabled = true;

		/* clear the values we set to reset defaults */
		aux_reg = 0;
		gpio_reg = 0;

		for (unsigned int i = 0; i < pf->ptp.info.n_ext_ts; i++)
			if ((pf->ptp.extts_rqs[i].flags &
			     PTP_ENABLE_FEATURE) &&
			    i != chan) {
				last_enabled = false;
			}

		if (last_enabled)
			irq_reg &= ~PFINT_OICR_TSYN_EVNT_M;
	}

	wr32(hw, PFINT_OICR_ENA, irq_reg);
	wr32(hw, GLTSYN_AUX_IN(chan, tmr_idx), aux_reg);
	wr32(hw, GLGEN_GPIO_CTL(gpio_pin), gpio_reg);

	return 0;
}

/**
 * ice_ptp_disable_all_extts - Disable all EXTTS channels
 * @pf: Board private structure
 */
static void ice_ptp_disable_all_extts(struct ice_pf *pf)
{
	for (unsigned int i = 0; i < pf->ptp.info.n_ext_ts ; i++)
		if (pf->ptp.extts_rqs[i].flags & PTP_ENABLE_FEATURE)
			ice_ptp_cfg_extts(pf, &pf->ptp.extts_rqs[i],
					  false);

	synchronize_irq(pf->oicr_irq.virq);
}

/**
 * ice_ptp_enable_all_extts - Enable all EXTTS channels
 * @pf: Board private structure
 *
 * Called during reset to restore user configuration.
 */
static void ice_ptp_enable_all_extts(struct ice_pf *pf)
{
	for (unsigned int i = 0; i < pf->ptp.info.n_ext_ts ; i++)
		if (pf->ptp.extts_rqs[i].flags & PTP_ENABLE_FEATURE)
			ice_ptp_cfg_extts(pf, &pf->ptp.extts_rqs[i],
					  true);
}

/**
 * ice_ptp_write_perout - Write periodic wave parameters to HW
 * @hw: pointer to the HW struct
 * @chan: target channel
 * @gpio_pin: target GPIO pin
 * @start: target time to start periodic output
 * @period: target period
 *
 * Return: 0 on success, negative error code otherwise
 */
static int ice_ptp_write_perout(struct ice_hw *hw, unsigned int chan,
				unsigned int gpio_pin, u64 start, u64 period)
{

	u8 tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
	u32 val = 0;

	/* 0. Reset mode & out_en in AUX_OUT */
	wr32(hw, GLTSYN_AUX_OUT(chan, tmr_idx), 0);

	if (hw->mac_type == ICE_MAC_GENERIC_3K_E825) {
		int err;

		/* Enable/disable CGU 1PPS output for E825C */
		err = ice_tspll_cfg_pps_out_e825c(hw, !!period);
		if (err)
			return err;
	}

	/* 1. Write perout with half of required period value.
	 * HW toggles output when source clock hits the TGT and then adds
	 * GLTSYN_CLKO value to the target, so it ends up with 50% duty cycle.
	 */
	period >>= 1;

	/* For proper operation, GLTSYN_CLKO must be larger than clock tick and
	 * period has to fit in 32 bit register.
	 */
#define MIN_PULSE 3
	if (!!period && (period <= MIN_PULSE || period > U32_MAX)) {
		dev_err(ice_hw_to_dev(hw), "CLK period ticks must be >= %d && <= 2^32",
			MIN_PULSE);
		return -EIO;
	}

	wr32(hw, GLTSYN_CLKO(chan, tmr_idx), lower_32_bits(period));

	/* 2. Write TARGET time */
	wr32(hw, GLTSYN_TGT_L(chan, tmr_idx), lower_32_bits(start));
	wr32(hw, GLTSYN_TGT_H(chan, tmr_idx), upper_32_bits(start));

	/* 3. Write AUX_OUT register */
	if (!!period)
		val = GLTSYN_AUX_OUT_0_OUT_ENA_M | GLTSYN_AUX_OUT_0_OUTMOD_M;
	wr32(hw, GLTSYN_AUX_OUT(chan, tmr_idx), val);

	/* 4. write GPIO CTL reg */
	val = GLGEN_GPIO_CTL_PIN_DIR_M;
	if (!!period)
		val |= FIELD_PREP(GLGEN_GPIO_CTL_PIN_FUNC_M,
				  8 + chan + (tmr_idx * 4));

	wr32(hw, GLGEN_GPIO_CTL(gpio_pin), val);
	ice_flush(hw);

	return 0;
}

/**
 * ice_ptp_cfg_perout - Configure clock to generate periodic wave
 * @pf: Board private structure
 * @rq: Periodic output request
 * @on: Enable/disable flag
 *
 * Configure the internal clock generator modules to generate the clock wave of
 * specified period.
 *
 * Return: 0 on success, negative error code otherwise
 */
static int ice_ptp_cfg_perout(struct ice_pf *pf, struct ptp_perout_request *rq,
			      int on)
{
	unsigned int gpio_pin, prop_delay_ns;
	u64 clk, period, start, phase;
	struct ice_hw *hw = &pf->hw;
	int pin_desc_idx;

	pin_desc_idx = ice_ptp_find_pin_idx(pf, PTP_PF_PEROUT, rq->index);
	if (pin_desc_idx < 0)
		return -EIO;

	gpio_pin = pf->ptp.ice_pin_desc[pin_desc_idx].gpio[1];
	prop_delay_ns = pf->ptp.ice_pin_desc[pin_desc_idx].delay[1];
	period = rq->period.sec * NSEC_PER_SEC + rq->period.nsec;

	/* If we're disabling the output or period is 0, clear out CLKO and TGT
	 * and keep output level low.
	 */
	if (!on || !period)
		return ice_ptp_write_perout(hw, rq->index, gpio_pin, 0, 0);

	if (strncmp(pf->ptp.pin_desc[pin_desc_idx].name, "1PPS", 64) == 0 &&
	    period != NSEC_PER_SEC && hw->mac_type == ICE_MAC_GENERIC) {
		dev_err(ice_pf_to_dev(pf), "1PPS pin supports only 1 s period\n");
		return -EOPNOTSUPP;
	}

	if (period & 0x1) {
		dev_err(ice_pf_to_dev(pf), "CLK Period must be an even value\n");
		return -EIO;
	}

	start = rq->start.sec * NSEC_PER_SEC + rq->start.nsec;

	/* If PTP_PEROUT_PHASE is set, rq has phase instead of start time */
	if (rq->flags & PTP_PEROUT_PHASE)
		phase = start;
	else
		div64_u64_rem(start, period, &phase);

	/* If we have only phase or start time is in the past, start the timer
	 * at the next multiple of period, maintaining phase at least 0.5 second
	 * from now, so we have time to write it to HW.
	 */
	clk = ice_ptp_read_src_clk_reg(pf, NULL) + NSEC_PER_MSEC * 500;
	if (rq->flags & PTP_PEROUT_PHASE || start <= clk - prop_delay_ns)
		start = div64_u64(clk + period - 1, period) * period + phase;

	/* Compensate for propagation delay from the generator to the pin. */
	start -= prop_delay_ns;

	return ice_ptp_write_perout(hw, rq->index, gpio_pin, start, period);
}

/**
 * ice_ptp_disable_all_perout - Disable all currently configured outputs
 * @pf: Board private structure
 *
 * Disable all currently configured clock outputs. This is necessary before
 * certain changes to the PTP hardware clock. Use ice_ptp_enable_all_perout to
 * re-enable the clocks again.
 */
static void ice_ptp_disable_all_perout(struct ice_pf *pf)
{
	for (unsigned int i = 0; i < pf->ptp.info.n_per_out; i++)
		if (pf->ptp.perout_rqs[i].period.sec ||
		    pf->ptp.perout_rqs[i].period.nsec)
			ice_ptp_cfg_perout(pf, &pf->ptp.perout_rqs[i],
					   false);
}

/**
 * ice_ptp_enable_all_perout - Enable all configured periodic clock outputs
 * @pf: Board private structure
 *
 * Enable all currently configured clock outputs. Use this after
 * ice_ptp_disable_all_perout to reconfigure the output signals according to
 * their configuration.
 */
static void ice_ptp_enable_all_perout(struct ice_pf *pf)
{
	for (unsigned int i = 0; i < pf->ptp.info.n_per_out; i++)
		if (pf->ptp.perout_rqs[i].period.sec ||
		    pf->ptp.perout_rqs[i].period.nsec)
			ice_ptp_cfg_perout(pf, &pf->ptp.perout_rqs[i],
					   true);
}

/**
 * ice_verify_pin - verify if pin supports requested pin function
 * @info: the driver's PTP info structure
 * @pin: Pin index
 * @func: Assigned function
 * @chan: Assigned channel
 *
 * Return: 0 on success, -EOPNOTSUPP when function is not supported.
 */
static int ice_verify_pin(struct ptp_clock_info *info, unsigned int pin,
			  enum ptp_pin_function func, unsigned int chan)
{
	struct ice_pf *pf = ptp_info_to_pf(info);
	const struct ice_ptp_pin_desc *pin_desc;

	pin_desc = &pf->ptp.ice_pin_desc[pin];

	/* Is assigned function allowed? */
	switch (func) {
	case PTP_PF_EXTTS:
		if (pin_desc->gpio[0] < 0)
			return -EOPNOTSUPP;
		break;
	case PTP_PF_PEROUT:
		if (pin_desc->gpio[1] < 0)
			return -EOPNOTSUPP;
		break;
	case PTP_PF_NONE:
		break;
	case PTP_PF_PHYSYNC:
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

/**
 * ice_ptp_gpio_enable - Enable/disable ancillary features of PHC
 * @info: The driver's PTP info structure
 * @rq: The requested feature to change
 * @on: Enable/disable flag
 *
 * Return: 0 on success, negative error code otherwise
 */
static int ice_ptp_gpio_enable(struct ptp_clock_info *info,
			       struct ptp_clock_request *rq, int on)
{
	struct ice_pf *pf = ptp_info_to_pf(info);
	int err;

	switch (rq->type) {
	case PTP_CLK_REQ_PEROUT:
	{
		struct ptp_perout_request *cached =
			&pf->ptp.perout_rqs[rq->perout.index];

		err = ice_ptp_cfg_perout(pf, &rq->perout, on);
		if (!err) {
			*cached = rq->perout;
		} else {
			cached->period.sec = 0;
			cached->period.nsec = 0;
		}
		return err;
	}
	case PTP_CLK_REQ_EXTTS:
	{
		struct ptp_extts_request *cached =
			&pf->ptp.extts_rqs[rq->extts.index];

		err = ice_ptp_cfg_extts(pf, &rq->extts, on);
		if (!err)
			*cached = rq->extts;
		else
			cached->flags &= ~PTP_ENABLE_FEATURE;
		return err;
	}
	default:
		return -EOPNOTSUPP;
	}
}

/**
 * ice_ptp_gettimex64 - Get the time of the clock
 * @info: the driver's PTP info structure
 * @ts: timespec64 structure to hold the current time value
 * @sts: Optional parameter for holding a pair of system timestamps from
 *       the system clock. Will be ignored if NULL is given.
 *
 * Read the device clock and return the correct value on ns, after converting it
 * into a timespec struct.
 */
static int
ice_ptp_gettimex64(struct ptp_clock_info *info, struct timespec64 *ts,
		   struct ptp_system_timestamp *sts)
{
	struct ice_pf *pf = ptp_info_to_pf(info);
	u64 time_ns;

	time_ns = ice_ptp_read_src_clk_reg(pf, sts);
	*ts = ns_to_timespec64(time_ns);
	return 0;
}

/**
 * ice_ptp_settime64 - Set the time of the clock
 * @info: the driver's PTP info structure
 * @ts: timespec64 structure that holds the new time value
 *
 * Set the device clock to the user input value. The conversion from timespec
 * to ns happens in the write function.
 */
static int
ice_ptp_settime64(struct ptp_clock_info *info, const struct timespec64 *ts)
{
	struct ice_pf *pf = ptp_info_to_pf(info);
	struct timespec64 ts64 = *ts;
	struct ice_hw *hw = &pf->hw;
	int err;

	/* For Vernier mode on E82X, we need to recalibrate after new settime.
	 * Start with marking timestamps as invalid.
	 */
	if (hw->mac_type == ICE_MAC_GENERIC) {
		err = ice_ptp_clear_phy_offset_ready_e82x(hw);
		if (err)
			dev_warn(ice_pf_to_dev(pf), "Failed to mark timestamps as invalid before settime\n");
	}

	if (!ice_ptp_lock(hw)) {
		err = -EBUSY;
		goto exit;
	}

	/* Disable periodic outputs */
	ice_ptp_disable_all_perout(pf);

	err = ice_ptp_write_init(pf, &ts64);
	ice_ptp_unlock(hw);

	if (!err)
		ice_ptp_reset_cached_phctime(pf);

	/* Reenable periodic outputs */
	ice_ptp_enable_all_perout(pf);

	/* Recalibrate and re-enable timestamp blocks for E822/E823 */
	if (hw->mac_type == ICE_MAC_GENERIC)
		ice_ptp_restart_all_phy(pf);
exit:
	if (err) {
		dev_err(ice_pf_to_dev(pf), "PTP failed to set time %d\n", err);
		return err;
	}

	return 0;
}

/**
 * ice_ptp_adjtime_nonatomic - Do a non-atomic clock adjustment
 * @info: the driver's PTP info structure
 * @delta: Offset in nanoseconds to adjust the time by
 */
static int ice_ptp_adjtime_nonatomic(struct ptp_clock_info *info, s64 delta)
{
	struct timespec64 now, then;
	int ret;

	then = ns_to_timespec64(delta);
	ret = ice_ptp_gettimex64(info, &now, NULL);
	if (ret)
		return ret;
	now = timespec64_add(now, then);

	return ice_ptp_settime64(info, (const struct timespec64 *)&now);
}

/**
 * ice_ptp_adjtime - Adjust the time of the clock by the indicated delta
 * @info: the driver's PTP info structure
 * @delta: Offset in nanoseconds to adjust the time by
 */
static int ice_ptp_adjtime(struct ptp_clock_info *info, s64 delta)
{
	struct ice_pf *pf = ptp_info_to_pf(info);
	struct ice_hw *hw = &pf->hw;
	struct device *dev;
	int err;

	dev = ice_pf_to_dev(pf);

	/* Hardware only supports atomic adjustments using signed 32-bit
	 * integers. For any adjustment outside this range, perform
	 * a non-atomic get->adjust->set flow.
	 */
	if (delta > S32_MAX || delta < S32_MIN) {
		dev_dbg(dev, "delta = %lld, adjtime non-atomic\n", delta);
		return ice_ptp_adjtime_nonatomic(info, delta);
	}

	if (!ice_ptp_lock(hw)) {
		dev_err(dev, "PTP failed to acquire semaphore in adjtime\n");
		return -EBUSY;
	}

	/* Disable periodic outputs */
	ice_ptp_disable_all_perout(pf);

	err = ice_ptp_write_adj(pf, delta);

	/* Reenable periodic outputs */
	ice_ptp_enable_all_perout(pf);

	ice_ptp_unlock(hw);

	if (err) {
		dev_err(dev, "PTP failed to adjust time, err %d\n", err);
		return err;
	}

	ice_ptp_reset_cached_phctime(pf);

	return 0;
}

/**
 * struct ice_crosststamp_cfg - Device cross timestamp configuration
 * @lock_reg: The hardware semaphore lock to use
 * @lock_busy: Bit in the semaphore lock indicating the lock is busy
 * @ctl_reg: The hardware register to request cross timestamp
 * @ctl_active: Bit in the control register to request cross timestamp
 * @art_time_l: Lower 32-bits of ART system time
 * @art_time_h: Upper 32-bits of ART system time
 * @dev_time_l: Lower 32-bits of device time (per timer index)
 * @dev_time_h: Upper 32-bits of device time (per timer index)
 */
struct ice_crosststamp_cfg {
	/* HW semaphore lock register */
	u32 lock_reg;
	u32 lock_busy;

	/* Capture control register */
	u32 ctl_reg;
	u32 ctl_active;

	/* Time storage */
	u32 art_time_l;
	u32 art_time_h;
	u32 dev_time_l[2];
	u32 dev_time_h[2];
};

static const struct ice_crosststamp_cfg ice_crosststamp_cfg_e82x = {
	.lock_reg = PFHH_SEM,
	.lock_busy = PFHH_SEM_BUSY_M,
	.ctl_reg = GLHH_ART_CTL,
	.ctl_active = GLHH_ART_CTL_ACTIVE_M,
	.art_time_l = GLHH_ART_TIME_L,
	.art_time_h = GLHH_ART_TIME_H,
	.dev_time_l[0] = GLTSYN_HHTIME_L(0),
	.dev_time_h[0] = GLTSYN_HHTIME_H(0),
	.dev_time_l[1] = GLTSYN_HHTIME_L(1),
	.dev_time_h[1] = GLTSYN_HHTIME_H(1),
};

#ifdef CONFIG_ICE_HWTS
static const struct ice_crosststamp_cfg ice_crosststamp_cfg_e830 = {
	.lock_reg = E830_PFPTM_SEM,
	.lock_busy = E830_PFPTM_SEM_BUSY_M,
	.ctl_reg = E830_GLPTM_ART_CTL,
	.ctl_active = E830_GLPTM_ART_CTL_ACTIVE_M,
	.art_time_l = E830_GLPTM_ART_TIME_L,
	.art_time_h = E830_GLPTM_ART_TIME_H,
	.dev_time_l[0] = E830_GLTSYN_PTMTIME_L(0),
	.dev_time_h[0] = E830_GLTSYN_PTMTIME_H(0),
	.dev_time_l[1] = E830_GLTSYN_PTMTIME_L(1),
	.dev_time_h[1] = E830_GLTSYN_PTMTIME_H(1),
};

#endif /* CONFIG_ICE_HWTS */
/**
 * struct ice_crosststamp_ctx - Device cross timestamp context
 * @snapshot: snapshot of system clocks for historic interpolation
 * @snapshot_clock_id: System clock ID for @snapshot
 * @pf: pointer to the PF private structure
 * @cfg: pointer to hardware configuration for cross timestamp
 */
struct ice_crosststamp_ctx {
	struct system_time_snapshot snapshot;
	clockid_t snapshot_clock_id;
	struct ice_pf *pf;
	const struct ice_crosststamp_cfg *cfg;
};

/**
 * ice_capture_crosststamp - Capture a device/system cross timestamp
 * @device: Current device time
 * @system: System counter value read synchronously with device time
 * @__ctx: Context passed from ice_ptp_getcrosststamp
 *
 * Read device and system (ART) clock simultaneously and return the corrected
 * clock values in ns.
 *
 * Return: zero on success, or a negative error code on failure.
 */
static int ice_capture_crosststamp(ktime_t *device,
				   struct system_counterval_t *system,
				   void *__ctx)
{
	struct ice_crosststamp_ctx *ctx = __ctx;
	const struct ice_crosststamp_cfg *cfg;
	u32 lock, ctl, ts_lo, ts_hi, tmr_idx;
	struct ice_pf *pf;
	struct ice_hw *hw;
	int err;
	u64 ts;

	cfg = ctx->cfg;
	pf = ctx->pf;
	hw = &pf->hw;

	tmr_idx = hw->func_caps.ts_func_info.tmr_index_assoc;
	if (tmr_idx > 1)
		return -EINVAL;

	/* Poll until we obtain the cross-timestamp hardware semaphore */
	err = rd32_poll_timeout(hw, cfg->lock_reg, lock,
				!(lock & cfg->lock_busy),
				10 * USEC_PER_MSEC, 50 * USEC_PER_MSEC);
	if (err) {
		dev_err(ice_pf_to_dev(pf), "PTP failed to get cross timestamp lock\n");
		return -EBUSY;
	}

	/* Snapshot system time for historic interpolation */
	ktime_get_snapshot_id(ctx->snapshot_clock_id, &ctx->snapshot);

	/* Program cmd to master timer */
	ice_ptp_src_cmd(hw, ICE_PTP_READ_TIME);

	/* Start the ART and device clock sync sequence */
	ctl = rd32(hw, cfg->ctl_reg);
	ctl |= cfg->ctl_active;
	wr32(hw, cfg->ctl_reg, ctl);

	/* Poll until hardware completes the capture */
	err = rd32_poll_timeout(hw, cfg->ctl_reg, ctl, !(ctl & cfg->ctl_active),
				5, 20 * USEC_PER_MSEC);
	if (err)
		goto err_timeout;

	/* Read ART system time */
	ts_lo = rd32(hw, cfg->art_time_l);
	ts_hi = rd32(hw, cfg->art_time_h);
	ts = ((u64)ts_hi << 32) | ts_lo;
	system->cycles = ts;
	system->cs_id = CSID_X86_ART;
	system->use_nsecs = true;

	/* Read Device source clock time */
	ts_lo = rd32(hw, cfg->dev_time_l[tmr_idx]);
	ts_hi = rd32(hw, cfg->dev_time_h[tmr_idx]);
	ts = ((u64)ts_hi << 32) | ts_lo;
	*device = ns_to_ktime(ts);

err_timeout:
	/* Clear the master timer */
	ice_ptp_src_cmd(hw, ICE_PTP_NOP);

	/* Release HW lock */
	lock = rd32(hw, cfg->lock_reg);
	lock &= ~cfg->lock_busy;
	wr32(hw, cfg->lock_reg, lock);

	return err;
}

/**
 * ice_ptp_getcrosststamp - Capture a device cross timestamp
 * @info: the driver's PTP info structure
 * @cts: The memory to fill the cross timestamp info
 *
 * Capture a cross timestamp between the ART and the device PTP hardware
 * clock. Fill the cross timestamp information and report it back to the
 * caller.
 *
 * In order to correctly correlate the ART timestamp back to the TSC time, the
 * CPU must have X86_FEATURE_TSC_KNOWN_FREQ.
 *
 * Return: zero on success, or a negative error code on failure.
 */
static int ice_ptp_getcrosststamp(struct ptp_clock_info *info,
				  struct system_device_crosststamp *cts)
{
	struct ice_pf *pf = ptp_info_to_pf(info);
	struct ice_crosststamp_ctx ctx = {
		.snapshot_clock_id = cts->clock_id,
		.pf = pf,
	};

	switch (pf->hw.mac_type) {
	case ICE_MAC_GENERIC:
	case ICE_MAC_GENERIC_3K_E825:
		ctx.cfg = &ice_crosststamp_cfg_e82x;
		break;
#ifdef CONFIG_ICE_HWTS
	case ICE_MAC_E830:
		ctx.cfg = &ice_crosststamp_cfg_e830;
		break;
#endif /* CONFIG_ICE_HWTS */
	default:
		return -EOPNOTSUPP;
	}

	return get_device_system_crosststamp(ice_capture_crosststamp, &ctx,
					     &ctx.snapshot, cts);
}

/**
 * ice_ptp_hwtstamp_get - interface to read the timestamping config
 * @netdev: Pointer to network interface device structure
 * @config: Timestamping configuration structure
 *
 * Copy the timestamping config to user buffer
 */
int ice_ptp_hwtstamp_get(struct net_device *netdev,
			 struct kernel_hwtstamp_config *config)
{
	struct ice_pf *pf = ice_netdev_to_pf(netdev);

	if (pf->ptp.state != ICE_PTP_READY)
		return -EIO;

	*config = pf->ptp.tstamp_config;

	return 0;
}

/**
 * ice_ptp_set_timestamp_mode - Setup driver for requested timestamp mode
 * @pf: Board private structure
 * @config: hwtstamp settings requested or saved
 */
static int ice_ptp_set_timestamp_mode(struct ice_pf *pf,
				      struct kernel_hwtstamp_config *config)
{
	switch (config->tx_type) {
	case HWTSTAMP_TX_OFF:
		pf->ptp.tstamp_config.tx_type = HWTSTAMP_TX_OFF;
		break;
	case HWTSTAMP_TX_ON:
		pf->ptp.tstamp_config.tx_type = HWTSTAMP_TX_ON;
		break;
	default:
		return -ERANGE;
	}

	switch (config->rx_filter) {
	case HWTSTAMP_FILTER_NONE:
		pf->ptp.tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
		break;
	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_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
	case HWTSTAMP_FILTER_NTP_ALL:
	case HWTSTAMP_FILTER_ALL:
		pf->ptp.tstamp_config.rx_filter = HWTSTAMP_FILTER_ALL;
		break;
	default:
		return -ERANGE;
	}

	/* Immediately update the device timestamping mode */
	ice_ptp_restore_timestamp_mode(pf);

	return 0;
}

/**
 * ice_ptp_hwtstamp_set - interface to control the timestamping
 * @netdev: Pointer to network interface device structure
 * @config: Timestamping configuration structure
 * @extack: Netlink extended ack structure for error reporting
 *
 * Get the user config and store it
 */
int ice_ptp_hwtstamp_set(struct net_device *netdev,
			 struct kernel_hwtstamp_config *config,
			 struct netlink_ext_ack *extack)
{
	struct ice_pf *pf = ice_netdev_to_pf(netdev);
	int err;

	if (pf->ptp.state != ICE_PTP_READY)
		return -EAGAIN;

	err = ice_ptp_set_timestamp_mode(pf, config);
	if (err)
		return err;

	/* Return the actual configuration set */
	*config = pf->ptp.tstamp_config;

	return 0;
}

/**
 * ice_ptp_get_rx_hwts - Get packet Rx timestamp in ns
 * @rx_desc: Receive descriptor
 * @pkt_ctx: Packet context to get the cached time
 *
 * The driver receives a notification in the receive descriptor with timestamp.
 */
u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
			const struct ice_pkt_ctx *pkt_ctx)
{
	u64 ts_ns, cached_time;
	u32 ts_high;

	if (!(rx_desc->wb.time_stamp_low & ICE_PTP_TS_VALID))
		return 0;

	cached_time = READ_ONCE(pkt_ctx->cached_phctime);

	/* Do not report a timestamp if we don't have a cached PHC time */
	if (!cached_time)
		return 0;

	/* Use ice_ptp_extend_32b_ts directly, using the ring-specific cached
	 * PHC value, rather than accessing the PF. This also allows us to
	 * simply pass the upper 32bits of nanoseconds directly. Calling
	 * ice_ptp_extend_40b_ts is unnecessary as it would just discard these
	 * bits itself.
	 */
	ts_high = le32_to_cpu(rx_desc->wb.flex_ts.ts_high);
	ts_ns = ice_ptp_extend_32b_ts(cached_time, ts_high);

	return ts_ns;
}

/**
 * ice_ptp_setup_pin_cfg - setup PTP pin_config structure
 * @pf: Board private structure
 */
static void ice_ptp_setup_pin_cfg(struct ice_pf *pf)
{
	for (unsigned int i = 0; i < pf->ptp.info.n_pins; i++) {
		const struct ice_ptp_pin_desc *desc = &pf->ptp.ice_pin_desc[i];
		struct ptp_pin_desc *pin = &pf->ptp.pin_desc[i];
		const char *name;

		if (!ice_is_feature_supported(pf, ICE_F_SMA_CTRL))
			name = ice_pin_names[desc->name_idx];
		else
			name = ice_pin_names_dpll[desc->name_idx];

		strscpy(pin->name, name, sizeof(pin->name));

		pin->index = i;
	}

	pf->ptp.info.pin_config = pf->ptp.pin_desc;
}

/**
 * ice_ptp_disable_pins - Disable PTP pins
 * @pf: pointer to the PF structure
 *
 * Disable the OS access to the pins. Called to clear out the OS
 * indications of pin support when we fail to setup pin array.
 */
static void ice_ptp_disable_pins(struct ice_pf *pf)
{
	struct ptp_clock_info *info = &pf->ptp.info;

	dev_warn(ice_pf_to_dev(pf), "Failed to configure PTP pin control\n");

	info->enable = NULL;
	info->verify = NULL;
	info->n_pins = 0;
	info->n_ext_ts = 0;
	info->n_per_out = 0;
}

/**
 * ice_ptp_parse_sdp_entries - update ice_ptp_pin_desc structure from NVM
 * @pf: pointer to the PF structure
 * @entries: SDP connection section from NVM
 * @num_entries: number of valid entries in sdp_entries
 * @pins: PTP pins array to update
 *
 * Return: 0 on success, negative error code otherwise.
 */
static int ice_ptp_parse_sdp_entries(struct ice_pf *pf, __le16 *entries,
				     unsigned int num_entries,
				     struct ice_ptp_pin_desc *pins)
{
	unsigned int n_pins = 0;
	unsigned int i;

	/* Setup ice_pin_desc array */
	for (i = 0; i < ICE_N_PINS_MAX; i++) {
		pins[i].name_idx = -1;
		pins[i].gpio[0] = -1;
		pins[i].gpio[1] = -1;
	}

	for (i = 0; i < num_entries; i++) {
		u16 entry = le16_to_cpu(entries[i]);
		DECLARE_BITMAP(bitmap, GPIO_NA);
		unsigned int idx;
		bool dir;
		u16 gpio;

		*bitmap = FIELD_GET(ICE_AQC_NVM_SDP_AC_PIN_M, entry);

		/* Check if entry's pin bitmap is valid. */
		if (bitmap_empty(bitmap, GPIO_NA))
			continue;

		dir = !!FIELD_GET(ICE_AQC_NVM_SDP_AC_DIR_M, entry);
		gpio = FIELD_GET(ICE_AQC_NVM_SDP_AC_SDP_NUM_M, entry);

		for (idx = 0; idx < ICE_N_PINS_MAX; idx++) {
			if (pins[idx].name_idx == gpio)
				break;
		}

		if (idx == ICE_N_PINS_MAX) {
			/* Pin not found, setup its entry and name */
			idx = n_pins++;
			pins[idx].name_idx = gpio;
		}
		pins[idx].gpio[dir] = gpio;
	}

	for (i = 0; i < n_pins; i++) {
		dev_dbg(ice_pf_to_dev(pf),
			"NVM pin entry[%d] : name_idx %d gpio_out %d gpio_in %d\n",
			i, pins[i].name_idx, pins[i].gpio[1], pins[i].gpio[0]);
	}

	pf->ptp.info.n_pins = n_pins;
	return 0;
}

/**
 * ice_ptp_set_funcs_e82x - Set specialized functions for E82X support
 * @pf: Board private structure
 *
 * Assign functions to the PTP capabilities structure for E82X devices.
 * Functions which operate across all device families should be set directly
 * in ice_ptp_set_caps. Only add functions here which are distinct for E82X
 * devices.
 */
static void ice_ptp_set_funcs_e82x(struct ice_pf *pf)
{
	pf->ptp.info.getcrosststamp = ice_ptp_getcrosststamp;

	if (pf->hw.mac_type == ICE_MAC_GENERIC_3K_E825) {
		pf->ptp.ice_pin_desc = ice_pin_desc_e825c;
		pf->ptp.info.n_pins = ARRAY_SIZE(ice_pin_desc_e825c);
	} else {
		pf->ptp.ice_pin_desc = ice_pin_desc_e82x;
		pf->ptp.info.n_pins = ARRAY_SIZE(ice_pin_desc_e82x);
	}
	ice_ptp_setup_pin_cfg(pf);
}

/**
 * ice_ptp_set_funcs_e810 - Set specialized functions for E810 support
 * @pf: Board private structure
 *
 * Assign functions to the PTP capabiltiies structure for E810 devices.
 * Functions which operate across all device families should be set directly
 * in ice_ptp_set_caps. Only add functions here which are distinct for E810
 * devices.
 */
static void ice_ptp_set_funcs_e810(struct ice_pf *pf)
{
	__le16 entries[ICE_AQC_NVM_SDP_AC_MAX_SIZE];
	struct ice_ptp_pin_desc *desc = NULL;
	struct ice_ptp *ptp = &pf->ptp;
	unsigned int num_entries;
	int err;

	err = ice_ptp_read_sdp_ac(&pf->hw, entries, &num_entries);
	if (err) {
		/* SDP section does not exist in NVM or is corrupted */
		if (ice_is_feature_supported(pf, ICE_F_SMA_CTRL)) {
			ptp->ice_pin_desc = ice_pin_desc_dpll;
			ptp->info.n_pins = ARRAY_SIZE(ice_pin_desc_dpll);
		} else {
			pf->ptp.ice_pin_desc = ice_pin_desc_e810;
			pf->ptp.info.n_pins = ARRAY_SIZE(ice_pin_desc_e810);
		}
		err = 0;
	} else {
		desc = devm_kcalloc(ice_pf_to_dev(pf), ICE_N_PINS_MAX,
				    sizeof(struct ice_ptp_pin_desc),
				    GFP_KERNEL);
		if (!desc)
			goto err;

		err = ice_ptp_parse_sdp_entries(pf, entries, num_entries, desc);
		if (err)
			goto err;

		ptp->ice_pin_desc = (const struct ice_ptp_pin_desc *)desc;
	}

	ptp->info.pin_config = ptp->pin_desc;
	ice_ptp_setup_pin_cfg(pf);

err:
	if (err) {
		devm_kfree(ice_pf_to_dev(pf), desc);
		ice_ptp_disable_pins(pf);
	}
}

/**
 * ice_ptp_set_funcs_e830 - Set specialized functions for E830 support
 * @pf: Board private structure
 *
 * Assign functions to the PTP capabiltiies structure for E830 devices.
 * Functions which operate across all device families should be set directly
 * in ice_ptp_set_caps. Only add functions here which are distinct for E830
 * devices.
 */
static void ice_ptp_set_funcs_e830(struct ice_pf *pf)
{
#ifdef CONFIG_ICE_HWTS
	if (pcie_ptm_enabled(pf->pdev) && boot_cpu_has(X86_FEATURE_ART))
		pf->ptp.info.getcrosststamp = ice_ptp_getcrosststamp;

#endif /* CONFIG_ICE_HWTS */
	/* Rest of the config is the same as base E810 */
	pf->ptp.ice_pin_desc = ice_pin_desc_e810;
	pf->ptp.info.n_pins = ARRAY_SIZE(ice_pin_desc_e810);
	ice_ptp_setup_pin_cfg(pf);
}

/**
 * ice_ptp_set_caps - Set PTP capabilities
 * @pf: Board private structure
 */
static void ice_ptp_set_caps(struct ice_pf *pf)
{
	struct ptp_clock_info *info = &pf->ptp.info;
	struct device *dev = ice_pf_to_dev(pf);

	snprintf(info->name, sizeof(info->name) - 1, "%s-%s-clk",
		 dev_driver_string(dev), dev_name(dev));
	info->owner = THIS_MODULE;
	info->max_adj = 100000000;
	info->adjtime = ice_ptp_adjtime;
	info->adjfine = ice_ptp_adjfine;
	info->gettimex64 = ice_ptp_gettimex64;
	info->settime64 = ice_ptp_settime64;
	info->n_per_out = GLTSYN_TGT_H_IDX_MAX;
	info->n_ext_ts = GLTSYN_EVNT_H_IDX_MAX;
	info->enable = ice_ptp_gpio_enable;
	info->verify = ice_verify_pin;

	info->supported_extts_flags = PTP_RISING_EDGE |
				      PTP_FALLING_EDGE |
				      PTP_STRICT_FLAGS;
	info->supported_perout_flags = PTP_PEROUT_PHASE;

	switch (pf->hw.mac_type) {
	case ICE_MAC_E810:
		ice_ptp_set_funcs_e810(pf);
		return;
	case ICE_MAC_E830:
		ice_ptp_set_funcs_e830(pf);
		return;
	case ICE_MAC_GENERIC:
	case ICE_MAC_GENERIC_3K_E825:
		ice_ptp_set_funcs_e82x(pf);
		return;
	default:
		return;
	}
}

/**
 * ice_ptp_create_clock - Create PTP clock device for userspace
 * @pf: Board private structure
 *
 * This function creates a new PTP clock device. It only creates one if we
 * don't already have one. Will return error if it can't create one, but success
 * if we already have a device. Should be used by ice_ptp_init to create clock
 * initially, and prevent global resets from creating new clock devices.
 */
static long ice_ptp_create_clock(struct ice_pf *pf)
{
	struct ptp_clock_info *info;
	struct device *dev;

	/* No need to create a clock device if we already have one */
	if (pf->ptp.clock)
		return 0;

	ice_ptp_set_caps(pf);

	info = &pf->ptp.info;
	dev = ice_pf_to_dev(pf);

	/* Attempt to register the clock before enabling the hardware. */
	pf->ptp.clock = ptp_clock_register(info, dev);
	if (IS_ERR(pf->ptp.clock)) {
		dev_err(ice_pf_to_dev(pf), "Failed to register PTP clock device");
		return PTR_ERR(pf->ptp.clock);
	}

	return 0;
}

/**
 * ice_ptp_request_ts - Request an available Tx timestamp index
 * @tx: the PTP Tx timestamp tracker to request from
 * @skb: the SKB to associate with this timestamp request
 */
s8 ice_ptp_request_ts(struct ice_ptp_tx *tx, struct sk_buff *skb)
{
	unsigned long flags;
	u8 idx;

	spin_lock_irqsave(&tx->lock, flags);

	/* Check that this tracker is accepting new timestamp requests */
	if (!ice_ptp_is_tx_tracker_up(tx)) {
		spin_unlock_irqrestore(&tx->lock, flags);
		return -1;
	}

	/* Find and set the first available index */
	idx = find_next_zero_bit(tx->in_use, tx->len,
				 tx->last_ll_ts_idx_read + 1);
	if (idx == tx->len)
		idx = find_first_zero_bit(tx->in_use, tx->len);

	if (idx < tx->len) {
		/* We got a valid index that no other thread could have set. Store
		 * a reference to the skb and the start time to allow discarding old
		 * requests.
		 */
		set_bit(idx, tx->in_use);
		clear_bit(idx, tx->stale);
		tx->tstamps[idx].start = jiffies;
		tx->tstamps[idx].skb = skb_get(skb);
		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
		ice_trace(tx_tstamp_request, skb, idx);
	}

	spin_unlock_irqrestore(&tx->lock, flags);

	/* return the appropriate PHY timestamp register index, -1 if no
	 * indexes were available.
	 */
	if (idx >= tx->len)
		return -1;
	else
		return idx + tx->offset;
}

void ice_ptp_process_ts(struct ice_pf *pf)
{
	switch (pf->ptp.tx_interrupt_mode) {
	case ICE_PTP_TX_INTERRUPT_NONE:
		/* This device has the clock owner handle timestamps for it */
		return;
	case ICE_PTP_TX_INTERRUPT_SELF:
		/* This device handles its own timestamps */
		ice_ptp_process_tx_tstamp(&pf->ptp.port.tx);
		return;
	case ICE_PTP_TX_INTERRUPT_ALL:
		/* This device handles timestamps for all ports */
		ice_ptp_tx_tstamp_owner(pf);
		return;
	default:
		WARN_ONCE(1, "Unexpected Tx timestamp interrupt mode %u\n",
			  pf->ptp.tx_interrupt_mode);
		return;
	}
}

static bool ice_port_has_timestamps(struct ice_ptp_tx *tx)
{
	bool more_timestamps;

	scoped_guard(spinlock_irqsave, &tx->lock) {
		if (!tx->init)
			return false;

		more_timestamps = !bitmap_empty(tx->in_use, tx->len);
	}

	return more_timestamps;
}

static bool ice_any_port_has_timestamps(struct ice_pf *pf)
{
	struct ice_ptp_port *port;

	scoped_guard(mutex, &pf->adapter->ports.lock) {
		list_for_each_entry(port, &pf->adapter->ports.ports,
				    list_node) {
			struct ice_ptp_tx *tx = &port->tx;

			if (ice_port_has_timestamps(tx))
				return true;
		}
	}

	return false;
}

bool ice_ptp_tx_tstamps_pending(struct ice_pf *pf)
{
	struct ice_hw *hw = &pf->hw;
	int ret;

	/* Check software indicator */
	switch (pf->ptp.tx_interrupt_mode) {
	case ICE_PTP_TX_INTERRUPT_NONE:
		return false;
	case ICE_PTP_TX_INTERRUPT_SELF:
		if (ice_port_has_timestamps(&pf->ptp.port.tx))
			return true;
		break;
	case ICE_PTP_TX_INTERRUPT_ALL:
		if (ice_any_port_has_timestamps(pf))
			return true;
		break;
	default:
		WARN_ONCE(1, "Unexpected Tx timestamp interrupt mode %u\n",
			  pf->ptp.tx_interrupt_mode);
		break;
	}

	/* Check hardware indicator */
	ret = ice_check_phy_tx_tstamp_ready(hw);
	if (ret < 0) {
		dev_dbg(ice_pf_to_dev(pf), "Unable to read PHY Tx timestamp ready bitmap, err %d\n",
			ret);
		/* Stop triggering IRQs if we're unable to read PHY */
		return false;
	}

	/* ice_check_phy_tx_tstamp_ready() returns 1 if there are timestamps
	 * available, 0 if there are no waiting timestamps, and a negative
	 * value if there was an error (which we checked for above).
	 */
	return ret > 0;
}

/**
 * ice_ptp_ts_irq - Process the PTP Tx timestamps in IRQ context
 * @pf: Board private structure
 *
 * Return: IRQ_WAKE_THREAD if Tx timestamp read has to be handled in the bottom
 *         half of the interrupt and IRQ_HANDLED otherwise.
 */
irqreturn_t ice_ptp_ts_irq(struct ice_pf *pf)
{
	struct ice_hw *hw = &pf->hw;

	switch (hw->mac_type) {
	case ICE_MAC_E810:
		/* E810 capable of low latency timestamping with interrupt can
		 * request a single timestamp in the top half and wait for
		 * a second LL TS interrupt from the FW when it's ready.
		 */
		if (hw->dev_caps.ts_dev_info.ts_ll_int_read) {
			struct ice_ptp_tx *tx = &pf->ptp.port.tx;
			u8 idx, last;

			if (!ice_pf_state_is_nominal(pf))
				return IRQ_HANDLED;

			spin_lock(&tx->lock);
			if (tx->init) {
				last = tx->last_ll_ts_idx_read + 1;
				idx = find_next_bit_wrap(tx->in_use, tx->len,
							 last);
				if (idx != tx->len)
					ice_ptp_req_tx_single_tstamp(tx, idx);
			}
			spin_unlock(&tx->lock);

			return IRQ_HANDLED;
		}
		fallthrough; /* non-LL_TS E810 */
	case ICE_MAC_GENERIC:
	case ICE_MAC_GENERIC_3K_E825:
		/* All other devices process timestamps in the bottom half due
		 * to sleeping or polling.
		 */
		if (!ice_ptp_pf_handles_tx_interrupt(pf))
			return IRQ_HANDLED;

		set_bit(ICE_MISC_THREAD_TX_TSTAMP, pf->misc_thread);
		return IRQ_WAKE_THREAD;
	case ICE_MAC_E830:
		/* E830 can read timestamps in the top half using rd32() */
		ice_ptp_process_ts(pf);

		if (ice_ptp_tx_tstamps_pending(pf)) {
			/* Process outstanding Tx timestamps. If there
			 * is more work, re-arm the interrupt to trigger again.
			 */
			wr32(hw, PFINT_OICR, PFINT_OICR_TSYN_TX_M);
			ice_flush(hw);
		}
		return IRQ_HANDLED;
	default:
		return IRQ_HANDLED;
	}
}

/**
 * ice_ptp_maybe_trigger_tx_interrupt - Trigger Tx timstamp interrupt
 * @pf: Board private structure
 *
 * The device PHY issues Tx timestamp interrupts to the driver for processing
 * timestamp data from the PHY. It will not interrupt again until all
 * current timestamp data is read. In rare circumstances, it is possible that
 * the driver fails to read all outstanding data.
 *
 * To avoid getting permanently stuck, periodically check if the PHY has
 * outstanding timestamp data. If so, trigger an interrupt from software to
 * process this data.
 */
static void ice_ptp_maybe_trigger_tx_interrupt(struct ice_pf *pf)
{
	struct device *dev = ice_pf_to_dev(pf);
	struct ice_hw *hw = &pf->hw;
	int ret;

	if (!pf->ptp.port.tx.has_ready_bitmap)
		return;

	if (!ice_pf_src_tmr_owned(pf))
		return;

	ret = ice_check_phy_tx_tstamp_ready(hw);
	if (ret < 0) {
		dev_dbg(dev, "PTP periodic task unable to read PHY timestamp ready bitmap, err %d\n",
			ret);
	} else if (ret) {
		dev_dbg(dev, "PTP periodic task detected waiting timestamps. Triggering Tx timestamp interrupt now.\n");

		wr32(hw, PFINT_OICR, PFINT_OICR_TSYN_TX_M);
		ice_flush(hw);
	}
}

static void ice_ptp_periodic_work(struct kthread_work *work)
{
	struct ice_ptp *ptp = container_of(work, struct ice_ptp, work.work);
	struct ice_pf *pf = container_of(ptp, struct ice_pf, ptp);
	int err;

	if (pf->ptp.state != ICE_PTP_READY)
		return;

	err = ice_ptp_update_cached_phctime(pf);

	ice_ptp_maybe_trigger_tx_interrupt(pf);

	/* Run twice a second or reschedule if phc update failed */
	kthread_queue_delayed_work(ptp->kworker, &ptp->work,
				   msecs_to_jiffies(err ? 10 : 500));
}

/**
 * ice_ptp_queue_work - Queue PTP periodic work for a PF
 * @pf: Board private structure
 *
 * Helper function to queue PTP periodic work after VSI rebuild completes.
 * This ensures that PTP work only runs when VSI structures are ready.
 */
void ice_ptp_queue_work(struct ice_pf *pf)
{
	if (test_bit(ICE_FLAG_PTP_SUPPORTED, pf->flags) &&
	    pf->ptp.state == ICE_PTP_READY)
		kthread_queue_delayed_work(pf->ptp.kworker, &pf->ptp.work, 0);
}

/**
 * ice_ptp_prepare_rebuild_sec - Prepare second NAC for PTP reset or rebuild
 * @pf: Board private structure
 * @rebuild: rebuild if true, prepare if false
 * @reset_type: the reset type being performed
 */
static void ice_ptp_prepare_rebuild_sec(struct ice_pf *pf, bool rebuild,
					enum ice_reset_req reset_type)
{
	struct list_head *entry;

	list_for_each(entry, &pf->adapter->ports.ports) {
		struct ice_ptp_port *port = list_entry(entry,
						       struct ice_ptp_port,
						       list_node);
		struct ice_pf *peer_pf = ptp_port_to_pf(port);

		if (!ice_is_primary(&peer_pf->hw)) {
			if (rebuild) {
				/* TODO: When implementing rebuild=true:
				 * 1. Ensure secondary PFs' VSIs are rebuilt
				 * 2. Call ice_ptp_queue_work(peer_pf) after VSI rebuild
				 */
				ice_ptp_rebuild(peer_pf, reset_type);
			} else {
				ice_ptp_prepare_for_reset(peer_pf, reset_type);
			}
		}
	}
}

/**
 * ice_ptp_prepare_for_reset - Prepare PTP for reset
 * @pf: Board private structure
 * @reset_type: the reset type being performed
 */
void ice_ptp_prepare_for_reset(struct ice_pf *pf, enum ice_reset_req reset_type)
{
	struct ice_ptp *ptp = &pf->ptp;
	struct ice_hw *hw = &pf->hw;
	u8 src_tmr;

	if (ptp->state != ICE_PTP_READY)
		return;

	ptp->state = ICE_PTP_RESETTING;

	/* Disable timestamping for both Tx and Rx */
	ice_ptp_disable_timestamp_mode(pf);

	kthread_cancel_delayed_work_sync(&ptp->work);

	if (reset_type == ICE_RESET_PFR)
		return;

	if (ice_pf_src_tmr_owned(pf) && hw->mac_type == ICE_MAC_GENERIC_3K_E825)
		ice_ptp_prepare_rebuild_sec(pf, false, reset_type);

	ice_ptp_release_tx_tracker(pf, &pf->ptp.port.tx);

	/* Disable periodic outputs */
	ice_ptp_disable_all_perout(pf);

	src_tmr = ice_get_ptp_src_clock_index(&pf->hw);

	/* Disable source clock */
	wr32(&pf->hw, GLTSYN_ENA(src_tmr), (u32)~GLTSYN_ENA_TSYN_ENA_M);

	/* Acquire PHC and system timer to restore after reset */
	ptp->reset_time = ktime_get_real_ns();
}

/**
 * ice_ptp_rebuild_owner - Initialize PTP clock owner after reset
 * @pf: Board private structure
 *
 * Companion function for ice_ptp_rebuild() which handles tasks that only the
 * PTP clock owner instance should perform.
 */
static int ice_ptp_rebuild_owner(struct ice_pf *pf)
{
	struct ice_ptp *ptp = &pf->ptp;
	struct ice_hw *hw = &pf->hw;
	struct timespec64 ts;
	u64 time_diff;
	int err;

	err = ice_ptp_init_phc(hw);
	if (err)
		return err;

	err = ice_tspll_init(hw);
	if (err)
		return err;

	/* Acquire the global hardware lock */
	if (!ice_ptp_lock(hw)) {
		err = -EBUSY;
		return err;
	}

	/* Write the increment time value to PHY and LAN */
	err = ice_ptp_write_incval(hw, ice_base_incval(pf));
	if (err)
		goto err_unlock;

	/* Write the initial Time value to PHY and LAN using the cached PHC
	 * time before the reset and time difference between stopping and
	 * starting the clock.
	 */
	if (ptp->cached_phc_time) {
		time_diff = ktime_get_real_ns() - ptp->reset_time;
		ts = ns_to_timespec64(ptp->cached_phc_time + time_diff);
	} else {
		ts = ktime_to_timespec64(ktime_get_real());
	}
	err = ice_ptp_write_init(pf, &ts);
	if (err)
		goto err_unlock;

	/* Release the global hardware lock */
	ice_ptp_unlock(hw);

	/* Flush software tracking of any outstanding timestamps since we're
	 * about to flush the PHY timestamp block.
	 */
	ice_ptp_flush_all_tx_tracker(pf);

	/* Enable quad interrupts */
	err = ice_ptp_cfg_phy_interrupt(pf, true, 1);
	if (err)
		return err;

	ice_ptp_restart_all_phy(pf);

	/* Re-enable all periodic outputs and external timestamp events */
	ice_ptp_enable_all_perout(pf);
	ice_ptp_enable_all_extts(pf);

	return 0;

err_unlock:
	ice_ptp_unlock(hw);
	return err;
}

/**
 * ice_ptp_rebuild - Initialize PTP hardware clock support after reset
 * @pf: Board private structure
 * @reset_type: the reset type being performed
 */
void ice_ptp_rebuild(struct ice_pf *pf, enum ice_reset_req reset_type)
{
	struct ice_ptp *ptp = &pf->ptp;
	int err;

	if (ptp->state == ICE_PTP_READY) {
		ice_ptp_prepare_for_reset(pf, reset_type);
	} else if (ptp->state != ICE_PTP_RESETTING) {
		err = -EINVAL;
		dev_err(ice_pf_to_dev(pf), "PTP was not initialized\n");
		goto err;
	}

	if (ice_pf_src_tmr_owned(pf) && reset_type != ICE_RESET_PFR) {
		err = ice_ptp_rebuild_owner(pf);
		if (err)
			goto err;
	}

	ptp->state = ICE_PTP_READY;

	dev_info(ice_pf_to_dev(pf), "PTP reset successful\n");
	return;

err:
	ptp->state = ICE_PTP_ERROR;
	dev_err(ice_pf_to_dev(pf), "PTP reset failed %d\n", err);
}

static int ice_ptp_setup_adapter(struct ice_pf *pf)
{
	if (!ice_pf_src_tmr_owned(pf) || !ice_is_primary(&pf->hw))
		return -EPERM;

	pf->adapter->ctrl_pf = pf;

	return 0;
}

static int ice_ptp_setup_pf(struct ice_pf *pf)
{
	struct ice_ptp *ctrl_ptp = ice_get_ctrl_ptp(pf);
	struct ice_ptp *ptp = &pf->ptp;

	if (!ctrl_ptp) {
		dev_info(ice_pf_to_dev(pf),
			 "PTP unavailable: no controlling PF\n");
		return -EOPNOTSUPP;
	}

	if (pf->hw.mac_type == ICE_MAC_UNKNOWN)
		return -ENODEV;

	INIT_LIST_HEAD(&ptp->port.list_node);
	mutex_lock(&pf->adapter->ports.lock);

	list_add(&ptp->port.list_node,
		 &pf->adapter->ports.ports);
	mutex_unlock(&pf->adapter->ports.lock);

	return 0;
}

static void ice_ptp_cleanup_pf(struct ice_pf *pf)
{
	struct ice_ptp *ptp = &pf->ptp;

	if (pf->hw.mac_type != ICE_MAC_UNKNOWN) {
		mutex_lock(&pf->adapter->ports.lock);
		list_del(&ptp->port.list_node);
		mutex_unlock(&pf->adapter->ports.lock);
	}
}

/**
 * ice_ptp_clock_index - Get the PTP clock index for this device
 * @pf: Board private structure
 *
 * Returns: the PTP clock index associated with this PF, or -1 if no PTP clock
 * is associated.
 */
int ice_ptp_clock_index(struct ice_pf *pf)
{
	struct ice_ptp *ctrl_ptp = ice_get_ctrl_ptp(pf);
	struct ptp_clock *clock;

	if (!ctrl_ptp)
		return -1;
	clock = ctrl_ptp->clock;

	return clock ? ptp_clock_index(clock) : -1;
}

/**
 * ice_ptp_init_owner - Initialize PTP_1588_CLOCK device
 * @pf: Board private structure
 *
 * Setup and initialize a PTP clock device that represents the device hardware
 * clock. Save the clock index for other functions connected to the same
 * hardware resource.
 */
static int ice_ptp_init_owner(struct ice_pf *pf)
{
	struct ice_hw *hw = &pf->hw;
	struct timespec64 ts;
	int err;

	err = ice_ptp_init_phc(hw);
	if (err) {
		dev_err(ice_pf_to_dev(pf), "Failed to initialize PHC, err %d\n",
			err);
		return err;
	}

	err = ice_tspll_init(hw);
	if (err) {
		dev_err(ice_pf_to_dev(pf), "Failed to initialize CGU, status %d\n",
			err);
		return err;
	}

	/* Acquire the global hardware lock */
	if (!ice_ptp_lock(hw)) {
		err = -EBUSY;
		goto err_exit;
	}

	/* Write the increment time value to PHY and LAN */
	err = ice_ptp_write_incval(hw, ice_base_incval(pf));
	if (err)
		goto err_unlock;

	ts = ktime_to_timespec64(ktime_get_real());
	/* Write the initial Time value to PHY and LAN */
	err = ice_ptp_write_init(pf, &ts);
	if (err)
		goto err_unlock;

	/* Release the global hardware lock */
	ice_ptp_unlock(hw);

	/* Configure PHY interrupt settings */
	err = ice_ptp_cfg_phy_interrupt(pf, true, 1);
	if (err)
		goto err_exit;

	/* Ensure we have a clock device */
	err = ice_ptp_create_clock(pf);
	if (err)
		goto err_clk;

	return 0;
err_clk:
	pf->ptp.clock = NULL;
err_exit:
	return err;

err_unlock:
	ice_ptp_unlock(hw);
	return err;
}

/**
 * ice_ptp_init_work - Initialize PTP work threads
 * @pf: Board private structure
 * @ptp: PF PTP structure
 */
static int ice_ptp_init_work(struct ice_pf *pf, struct ice_ptp *ptp)
{
	struct kthread_worker *kworker;

	/* Initialize work functions */
	kthread_init_delayed_work(&ptp->work, ice_ptp_periodic_work);

	/* Allocate a kworker for handling work required for the ports
	 * connected to the PTP hardware clock.
	 */
	kworker = kthread_run_worker(0, "ice-ptp-%s",
					dev_name(ice_pf_to_dev(pf)));
	if (IS_ERR(kworker))
		return PTR_ERR(kworker);

	ptp->kworker = kworker;

	/* Start periodic work going */
	kthread_queue_delayed_work(ptp->kworker, &ptp->work, 0);

	return 0;
}

/**
 * ice_ptp_init_port - Initialize PTP port structure
 * @pf: Board private structure
 * @ptp_port: PTP port structure
 *
 * Return: 0 on success, -ENODEV on invalid MAC type, -ENOMEM on failed alloc.
 */
static int ice_ptp_init_port(struct ice_pf *pf, struct ice_ptp_port *ptp_port)
{
	struct ice_hw *hw = &pf->hw;

	mutex_init(&ptp_port->ps_lock);

	switch (hw->mac_type) {
	case ICE_MAC_E810:
	case ICE_MAC_E830:
	case ICE_MAC_GENERIC_3K_E825:
		return ice_ptp_init_tx(pf, &ptp_port->tx, ptp_port->port_num);
	case ICE_MAC_GENERIC:
		kthread_init_delayed_work(&ptp_port->ov_work,
					  ice_ptp_wait_for_offsets);
		return ice_ptp_init_tx_e82x(pf, &ptp_port->tx,
					    ptp_port->port_num);
	default:
		return -ENODEV;
	}
}

/**
 * ice_ptp_init_tx_interrupt_mode - Initialize device Tx interrupt mode
 * @pf: Board private structure
 *
 * Initialize the Tx timestamp interrupt mode for this device. For most device
 * types, each PF processes the interrupt and manages its own timestamps. For
 * E822-based devices, only the clock owner processes the timestamps. Other
 * PFs disable the interrupt and do not process their own timestamps.
 */
static void ice_ptp_init_tx_interrupt_mode(struct ice_pf *pf)
{
	switch (pf->hw.mac_type) {
	case ICE_MAC_GENERIC:
	case ICE_MAC_GENERIC_3K_E825:
		/* E82x hardware has the clock owner process timestamps for
		 * all ports.
		 */
		if (ice_pf_src_tmr_owned(pf))
			pf->ptp.tx_interrupt_mode = ICE_PTP_TX_INTERRUPT_ALL;
		else
			pf->ptp.tx_interrupt_mode = ICE_PTP_TX_INTERRUPT_NONE;
		break;
	default:
		/* other PHY types handle their own Tx interrupt */
		pf->ptp.tx_interrupt_mode = ICE_PTP_TX_INTERRUPT_SELF;
	}
}

/**
 * ice_ptp_init - Initialize PTP hardware clock support
 * @pf: Board private structure
 *
 * Set up the device for interacting with the PTP hardware clock for all
 * functions, both the function that owns the clock hardware, and the
 * functions connected to the clock hardware.
 *
 * The clock owner will allocate and register a ptp_clock with the
 * PTP_1588_CLOCK infrastructure. All functions allocate a kthread and work
 * items used for asynchronous work such as Tx timestamps and periodic work.
 */
void ice_ptp_init(struct ice_pf *pf)
{
	struct ice_ptp *ptp = &pf->ptp;
	struct ice_hw *hw = &pf->hw;
	int err;

	ptp->state = ICE_PTP_INITIALIZING;

	if (hw->lane_num < 0) {
		err = hw->lane_num;
		goto err_exit;
	}
	ptp->port.port_num = hw->lane_num;

	ice_ptp_init_hw(hw);

	ice_ptp_init_tx_interrupt_mode(pf);

	/* If this function owns the clock hardware, it must allocate and
	 * configure the PTP clock device to represent it.
	 */
	if (ice_pf_src_tmr_owned(pf) && ice_is_primary(hw)) {
		err = ice_ptp_setup_adapter(pf);
		if (err)
			goto err_exit;
		err = ice_ptp_init_owner(pf);
		if (err)
			goto err_exit;
	}

	err = ice_ptp_setup_pf(pf);
	if (err)
		goto err_exit;

	err = ice_ptp_init_port(pf, &ptp->port);
	if (err)
		goto err_clean_pf;

	/* Start the PHY timestamping block */
	ice_ptp_reset_phy_timestamping(pf);

	/* Configure initial Tx interrupt settings */
	ice_ptp_cfg_tx_interrupt(pf);

	ptp->state = ICE_PTP_READY;

	err = ice_ptp_init_work(pf, ptp);
	if (err)
		goto err_exit;

	dev_info(ice_pf_to_dev(pf), "PTP init successful\n");
	return;

err_clean_pf:
	mutex_destroy(&ptp->port.ps_lock);
	ice_ptp_cleanup_pf(pf);
err_exit:
	/* If we registered a PTP clock, release it */
	if (pf->ptp.clock) {
		ptp_clock_unregister(ptp->clock);
		pf->ptp.clock = NULL;
	}
	/* Keep ICE_PTP_UNINIT state to avoid ambiguity at driver unload
	 * and to avoid duplicated resources release.
	 */
	ptp->state = ICE_PTP_UNINIT;
	dev_err(ice_pf_to_dev(pf), "PTP failed %d\n", err);
}

/**
 * ice_ptp_release - Disable the driver/HW support and unregister the clock
 * @pf: Board private structure
 *
 * This function handles the cleanup work required from the initialization by
 * clearing out the important information and unregistering the clock
 */
void ice_ptp_release(struct ice_pf *pf)
{
	if (pf->ptp.state == ICE_PTP_UNINIT)
		return;

	if (pf->ptp.state != ICE_PTP_READY) {
		mutex_destroy(&pf->ptp.port.ps_lock);
		ice_ptp_cleanup_pf(pf);
		if (pf->ptp.clock) {
			ptp_clock_unregister(pf->ptp.clock);
			pf->ptp.clock = NULL;
		}
		return;
	}

	pf->ptp.state = ICE_PTP_UNINIT;

	/* Disable timestamping for both Tx and Rx */
	ice_ptp_disable_timestamp_mode(pf);

	ice_ptp_cleanup_pf(pf);

	ice_ptp_release_tx_tracker(pf, &pf->ptp.port.tx);

	ice_ptp_disable_all_extts(pf);

	kthread_cancel_delayed_work_sync(&pf->ptp.work);

	ice_ptp_port_phy_stop(&pf->ptp.port);
	mutex_destroy(&pf->ptp.port.ps_lock);
	if (pf->ptp.kworker) {
		kthread_destroy_worker(pf->ptp.kworker);
		pf->ptp.kworker = NULL;
	}

	if (!pf->ptp.clock)
		return;

	/* Disable periodic outputs */
	ice_ptp_disable_all_perout(pf);

	ptp_clock_unregister(pf->ptp.clock);
	pf->ptp.clock = NULL;

	dev_info(ice_pf_to_dev(pf), "Removed PTP clock\n");
}