Quelle  sparx5_ptp.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0+
/* Microchip Sparx5 Switch driver
 *
 * Copyright (c) 2021 Microchip Technology Inc. and its subsidiaries.
 *
 * The Sparx5 Chip Register Model can be browsed at this location:
 * https://github.com/microchip-ung/sparx-5_reginfo
 */
#include <linux/ptp_classify.h>

#include "sparx5_main_regs.h"
#include "sparx5_main.h"

#define TOD_ACC_PIN  0x4

enum {
 PTP_PIN_ACTION_IDLE = 0,
 PTP_PIN_ACTION_LOAD,
 PTP_PIN_ACTION_SAVE,
 PTP_PIN_ACTION_CLOCK,
 PTP_PIN_ACTION_DELTA,
 PTP_PIN_ACTION_TOD
};

static u64 sparx5_ptp_get_1ppm(struct sparx5 *sparx5)
{
 /* Represents 1ppm adjustment in 2^59 format with 1.59687500000(625)
 * 1.99609375000(500), 3.99218750000(250) as reference
 * The value is calculated as following:
 * (1/1000000)/((2^-59)/X)
 */

 u64 res = 0;

 switch (sparx5->coreclock) {
 case SPX5_CORE_CLOCK_250MHZ:
  res = 2301339409586;
  break;
 case SPX5_CORE_CLOCK_328MHZ:
  res = 1756832768924;
  break;
 case SPX5_CORE_CLOCK_500MHZ:
  res = 1150669704793;
  break;
 case SPX5_CORE_CLOCK_625MHZ:
  res =  920535763834;
  break;
 default:
  WARN(1, "Invalid core clock");
  break;
 }

 return res;
}

static u64 sparx5_ptp_get_nominal_value(struct sparx5 *sparx5)
{
 u64 res = 0;

 switch (sparx5->coreclock) {
 case SPX5_CORE_CLOCK_250MHZ:
  res = 0x1FF0000000000000;
  break;
 case SPX5_CORE_CLOCK_328MHZ:
  res = 0x18604697DD0F9B5B;
  break;
 case SPX5_CORE_CLOCK_500MHZ:
  res = 0x0FF8000000000000;
  break;
 case SPX5_CORE_CLOCK_625MHZ:
  res = 0x0CC6666666666666;
  break;
 default:
  WARN(1, "Invalid core clock");
  break;
 }

 return res;
}

int sparx5_ptp_hwtstamp_set(struct sparx5_port *port,
       struct kernel_hwtstamp_config *cfg,
       struct netlink_ext_ack *extack)
{
 struct sparx5 *sparx5 = port->sparx5;
 struct sparx5_phc *phc;

 /* For now don't allow to run ptp on ports that are part of a bridge,
 * because in case of transparent clock the HW will still forward the
 * frames, so there would be duplicate frames
 */

 if (test_bit(port->portno, sparx5->bridge_mask))
  return -EINVAL;

 switch (cfg->tx_type) {
 case HWTSTAMP_TX_ON:
  port->ptp_cmd = IFH_REW_OP_TWO_STEP_PTP;
  break;
 case HWTSTAMP_TX_ONESTEP_SYNC:
  port->ptp_cmd = IFH_REW_OP_ONE_STEP_PTP;
  break;
 case HWTSTAMP_TX_OFF:
  port->ptp_cmd = IFH_REW_OP_NOOP;
  break;
 default:
  return -ERANGE;
 }

 switch (cfg->rx_filter) {
 case HWTSTAMP_FILTER_NONE:
  break;
 case HWTSTAMP_FILTER_ALL:
 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
 case HWTSTAMP_FILTER_PTP_V2_EVENT:
 case HWTSTAMP_FILTER_PTP_V2_SYNC:
 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 case HWTSTAMP_FILTER_NTP_ALL:
  cfg->rx_filter = HWTSTAMP_FILTER_ALL;
  break;
 default:
  return -ERANGE;
 }

 /* Commit back the result & save it */
 mutex_lock(&sparx5->ptp_lock);
 phc = &sparx5->phc[SPARX5_PHC_PORT];
 phc->hwtstamp_config = *cfg;
 mutex_unlock(&sparx5->ptp_lock);

 return 0;
}

void sparx5_ptp_hwtstamp_get(struct sparx5_port *port,
        struct kernel_hwtstamp_config *cfg)
{
 struct sparx5 *sparx5 = port->sparx5;
 struct sparx5_phc *phc;

 phc = &sparx5->phc[SPARX5_PHC_PORT];
 *cfg = phc->hwtstamp_config;
}

static void sparx5_ptp_classify(struct sparx5_port *port, struct sk_buff *skb,
    u8 *rew_op, u8 *pdu_type, u8 *pdu_w16_offset)
{
 struct ptp_header *header;
 u8 msgtype;
 int type;

 if (port->ptp_cmd == IFH_REW_OP_NOOP) {
  *rew_op = IFH_REW_OP_NOOP;
  *pdu_type = IFH_PDU_TYPE_NONE;
  *pdu_w16_offset = 0;
  return;
 }

 type = ptp_classify_raw(skb);
 if (type == PTP_CLASS_NONE) {
  *rew_op = IFH_REW_OP_NOOP;
  *pdu_type = IFH_PDU_TYPE_NONE;
  *pdu_w16_offset = 0;
  return;
 }

 header = ptp_parse_header(skb, type);
 if (!header) {
  *rew_op = IFH_REW_OP_NOOP;
  *pdu_type = IFH_PDU_TYPE_NONE;
  *pdu_w16_offset = 0;
  return;
 }

 *pdu_w16_offset = 7;
 if (type & PTP_CLASS_L2)
  *pdu_type = IFH_PDU_TYPE_PTP;
 if (type & PTP_CLASS_IPV4)
  *pdu_type = IFH_PDU_TYPE_IPV4_UDP_PTP;
 if (type & PTP_CLASS_IPV6)
  *pdu_type = IFH_PDU_TYPE_IPV6_UDP_PTP;

 if (port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) {
  *rew_op = IFH_REW_OP_TWO_STEP_PTP;
  return;
 }

 /* If it is sync and run 1 step then set the correct operation,
 * otherwise run as 2 step
 */
 msgtype = ptp_get_msgtype(header, type);
 if ((msgtype & 0xf) == 0) {
  *rew_op = IFH_REW_OP_ONE_STEP_PTP;
  return;
 }

 *rew_op = IFH_REW_OP_TWO_STEP_PTP;
}

static void sparx5_ptp_txtstamp_old_release(struct sparx5_port *port)
{
 struct sk_buff *skb, *skb_tmp;
 unsigned long flags;

 spin_lock_irqsave(&port->tx_skbs.lock, flags);
 skb_queue_walk_safe(&port->tx_skbs, skb, skb_tmp) {
  if time_after(SPARX5_SKB_CB(skb)->jiffies + SPARX5_PTP_TIMEOUT,
         jiffies)
   break;

  __skb_unlink(skb, &port->tx_skbs);
  dev_kfree_skb_any(skb);
 }
 spin_unlock_irqrestore(&port->tx_skbs.lock, flags);
}

int sparx5_ptp_txtstamp_request(struct sparx5_port *port,
    struct sk_buff *skb)
{
 struct sparx5 *sparx5 = port->sparx5;
 u8 rew_op, pdu_type, pdu_w16_offset;
 unsigned long flags;

 sparx5_ptp_classify(port, skb, &rew_op, &pdu_type, &pdu_w16_offset);
 SPARX5_SKB_CB(skb)->rew_op = rew_op;
 SPARX5_SKB_CB(skb)->pdu_type = pdu_type;
 SPARX5_SKB_CB(skb)->pdu_w16_offset = pdu_w16_offset;

 if (rew_op != IFH_REW_OP_TWO_STEP_PTP)
  return 0;

 sparx5_ptp_txtstamp_old_release(port);

 spin_lock_irqsave(&sparx5->ptp_ts_id_lock, flags);
 if (sparx5->ptp_skbs == SPARX5_MAX_PTP_ID) {
  spin_unlock_irqrestore(&sparx5->ptp_ts_id_lock, flags);
  return -EBUSY;
 }

 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;

 skb_queue_tail(&port->tx_skbs, skb);
 SPARX5_SKB_CB(skb)->ts_id = port->ts_id;
 SPARX5_SKB_CB(skb)->jiffies = jiffies;

 sparx5->ptp_skbs++;
 port->ts_id++;
 if (port->ts_id == SPARX5_MAX_PTP_ID)
  port->ts_id = 0;

 spin_unlock_irqrestore(&sparx5->ptp_ts_id_lock, flags);

 return 0;
}

void sparx5_ptp_txtstamp_release(struct sparx5_port *port,
     struct sk_buff *skb)
{
 struct sparx5 *sparx5 = port->sparx5;
 unsigned long flags;

 spin_lock_irqsave(&sparx5->ptp_ts_id_lock, flags);
 port->ts_id--;
 sparx5->ptp_skbs--;
 skb_unlink(skb, &port->tx_skbs);
 spin_unlock_irqrestore(&sparx5->ptp_ts_id_lock, flags);
}

void sparx5_get_hwtimestamp(struct sparx5 *sparx5,
       struct timespec64 *ts,
       u32 nsec)
{
 /* Read current PTP time to get seconds */
 const struct sparx5_consts *consts = sparx5->data->consts;
 unsigned long flags;
 u32 curr_nsec;

 spin_lock_irqsave(&sparx5->ptp_clock_lock, flags);

 spx5_rmw(PTP_PTP_PIN_CFG_PTP_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) |
   PTP_PTP_PIN_CFG_PTP_PIN_DOM_SET(SPARX5_PHC_PORT) |
   PTP_PTP_PIN_CFG_PTP_PIN_SYNC_SET(0),
   PTP_PTP_PIN_CFG_PTP_PIN_ACTION |
   PTP_PTP_PIN_CFG_PTP_PIN_DOM |
   PTP_PTP_PIN_CFG_PTP_PIN_SYNC,
   sparx5, PTP_PTP_PIN_CFG(consts->tod_pin));

 ts->tv_sec = spx5_rd(sparx5, PTP_PTP_TOD_SEC_LSB(consts->tod_pin));
 curr_nsec = spx5_rd(sparx5, PTP_PTP_TOD_NSEC(consts->tod_pin));

 ts->tv_nsec = nsec;

 /* Sec has incremented since the ts was registered */
 if (curr_nsec < nsec)
  ts->tv_sec--;

 spin_unlock_irqrestore(&sparx5->ptp_clock_lock, flags);
}

irqreturn_t sparx5_ptp_irq_handler(int irq, void *args)
{
 int budget = SPARX5_MAX_PTP_ID;
 struct sparx5 *sparx5 = args;

 while (budget--) {
  struct sk_buff *skb, *skb_tmp, *skb_match = NULL;
  struct skb_shared_hwtstamps shhwtstamps;
  struct sparx5_port *port;
  struct timespec64 ts;
  unsigned long flags;
  u32 val, id, txport;
  u32 delay;

  val = spx5_rd(sparx5, REW_PTP_TWOSTEP_CTRL);

  /* Check if a timestamp can be retrieved */
  if (!(val & REW_PTP_TWOSTEP_CTRL_PTP_VLD))
   break;

  WARN_ON(val & REW_PTP_TWOSTEP_CTRL_PTP_OVFL);

  if (!(val & REW_PTP_TWOSTEP_CTRL_STAMP_TX))
   continue;

  /* Retrieve the ts Tx port */
  txport = REW_PTP_TWOSTEP_CTRL_STAMP_PORT_GET(val);

  /* Retrieve its associated skb */
  port = sparx5->ports[txport];

  /* Retrieve the delay */
  delay = spx5_rd(sparx5, REW_PTP_TWOSTEP_STAMP);
  delay = REW_PTP_TWOSTEP_STAMP_STAMP_NSEC_GET(delay);

  /* Get next timestamp from fifo, which needs to be the
 * rx timestamp which represents the id of the frame
 */
  spx5_rmw(REW_PTP_TWOSTEP_CTRL_PTP_NXT_SET(1),
    REW_PTP_TWOSTEP_CTRL_PTP_NXT,
    sparx5, REW_PTP_TWOSTEP_CTRL);

  val = spx5_rd(sparx5, REW_PTP_TWOSTEP_CTRL);

  /* Check if a timestamp can be retried */
  if (!(val & REW_PTP_TWOSTEP_CTRL_PTP_VLD))
   break;

  /* Read RX timestamping to get the ID */
  id = spx5_rd(sparx5, REW_PTP_TWOSTEP_STAMP);
  id <<= 8;
  id |= spx5_rd(sparx5, REW_PTP_TWOSTEP_STAMP_SUBNS);

  spin_lock_irqsave(&port->tx_skbs.lock, flags);
  skb_queue_walk_safe(&port->tx_skbs, skb, skb_tmp) {
   if (SPARX5_SKB_CB(skb)->ts_id != id)
    continue;

   __skb_unlink(skb, &port->tx_skbs);
   skb_match = skb;
   break;
  }
  spin_unlock_irqrestore(&port->tx_skbs.lock, flags);

  /* Next ts */
  spx5_rmw(REW_PTP_TWOSTEP_CTRL_PTP_NXT_SET(1),
    REW_PTP_TWOSTEP_CTRL_PTP_NXT,
    sparx5, REW_PTP_TWOSTEP_CTRL);

  if (WARN_ON(!skb_match))
   continue;

  spin_lock(&sparx5->ptp_ts_id_lock);
  sparx5->ptp_skbs--;
  spin_unlock(&sparx5->ptp_ts_id_lock);

  /* Get the h/w timestamp */
  sparx5_get_hwtimestamp(sparx5, &ts, delay);

  /* Set the timestamp into the skb */
  shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
  skb_tstamp_tx(skb_match, &shhwtstamps);

  dev_kfree_skb_any(skb_match);
 }

 return IRQ_HANDLED;
}

static int sparx5_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
{
 struct sparx5_phc *phc = container_of(ptp, struct sparx5_phc, info);
 struct sparx5 *sparx5 = phc->sparx5;
 unsigned long flags;
 bool neg_adj = 0;
 u64 tod_inc;
 u64 ref;

 if (!scaled_ppm)
  return 0;

 if (scaled_ppm < 0) {
  neg_adj = 1;
  scaled_ppm = -scaled_ppm;
 }

 tod_inc = sparx5_ptp_get_nominal_value(sparx5);

 /* The multiplication is split in 2 separate additions because of
 * overflow issues. If scaled_ppm with 16bit fractional part was bigger
 * than 20ppm then we got overflow.
 */
 ref = sparx5_ptp_get_1ppm(sparx5) * (scaled_ppm >> 16);
 ref += (sparx5_ptp_get_1ppm(sparx5) * (0xffff & scaled_ppm)) >> 16;
 tod_inc = neg_adj ? tod_inc - ref : tod_inc + ref;

 spin_lock_irqsave(&sparx5->ptp_clock_lock, flags);

 spx5_rmw(PTP_PTP_DOM_CFG_PTP_CLKCFG_DIS_SET(1 << BIT(phc->index)),
   PTP_PTP_DOM_CFG_PTP_CLKCFG_DIS,
   sparx5, PTP_PTP_DOM_CFG);

 spx5_wr((u32)tod_inc & 0xFFFFFFFF, sparx5,
  PTP_CLK_PER_CFG(phc->index, 0));
 spx5_wr((u32)(tod_inc >> 32), sparx5,
  PTP_CLK_PER_CFG(phc->index, 1));

 spx5_rmw(PTP_PTP_DOM_CFG_PTP_CLKCFG_DIS_SET(0),
   PTP_PTP_DOM_CFG_PTP_CLKCFG_DIS, sparx5,
   PTP_PTP_DOM_CFG);

 spin_unlock_irqrestore(&sparx5->ptp_clock_lock, flags);

 return 0;
}

static int sparx5_ptp_settime64(struct ptp_clock_info *ptp,
    const struct timespec64 *ts)
{
 struct sparx5_phc *phc = container_of(ptp, struct sparx5_phc, info);
 struct sparx5 *sparx5 = phc->sparx5;
 const struct sparx5_consts *consts;
 unsigned long flags;

 consts = sparx5->data->consts;

 spin_lock_irqsave(&sparx5->ptp_clock_lock, flags);

 /* Must be in IDLE mode before the time can be loaded */
 spx5_rmw(PTP_PTP_PIN_CFG_PTP_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
   PTP_PTP_PIN_CFG_PTP_PIN_DOM_SET(phc->index) |
   PTP_PTP_PIN_CFG_PTP_PIN_SYNC_SET(0),
   PTP_PTP_PIN_CFG_PTP_PIN_ACTION |
   PTP_PTP_PIN_CFG_PTP_PIN_DOM |
   PTP_PTP_PIN_CFG_PTP_PIN_SYNC,
   sparx5, PTP_PTP_PIN_CFG(consts->tod_pin));

 /* Set new value */
 spx5_wr(PTP_PTP_TOD_SEC_MSB_PTP_TOD_SEC_MSB_SET(upper_32_bits(ts->tv_sec)),
  sparx5, PTP_PTP_TOD_SEC_MSB(consts->tod_pin));
 spx5_wr(lower_32_bits(ts->tv_sec),
  sparx5, PTP_PTP_TOD_SEC_LSB(consts->tod_pin));
 spx5_wr(ts->tv_nsec, sparx5, PTP_PTP_TOD_NSEC(consts->tod_pin));

 /* Apply new values */
 spx5_rmw(PTP_PTP_PIN_CFG_PTP_PIN_ACTION_SET(PTP_PIN_ACTION_LOAD) |
   PTP_PTP_PIN_CFG_PTP_PIN_DOM_SET(phc->index) |
   PTP_PTP_PIN_CFG_PTP_PIN_SYNC_SET(0),
   PTP_PTP_PIN_CFG_PTP_PIN_ACTION |
   PTP_PTP_PIN_CFG_PTP_PIN_DOM |
   PTP_PTP_PIN_CFG_PTP_PIN_SYNC,
   sparx5, PTP_PTP_PIN_CFG(consts->tod_pin));

 spin_unlock_irqrestore(&sparx5->ptp_clock_lock, flags);

 return 0;
}

int sparx5_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts)
{
 struct sparx5_phc *phc = container_of(ptp, struct sparx5_phc, info);
 struct sparx5 *sparx5 = phc->sparx5;
 const struct sparx5_consts *consts;
 unsigned long flags;
 time64_t s;
 s64 ns;

 consts = sparx5->data->consts;

 spin_lock_irqsave(&sparx5->ptp_clock_lock, flags);

 spx5_rmw(PTP_PTP_PIN_CFG_PTP_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) |
   PTP_PTP_PIN_CFG_PTP_PIN_DOM_SET(phc->index) |
   PTP_PTP_PIN_CFG_PTP_PIN_SYNC_SET(0),
   PTP_PTP_PIN_CFG_PTP_PIN_ACTION |
   PTP_PTP_PIN_CFG_PTP_PIN_DOM |
   PTP_PTP_PIN_CFG_PTP_PIN_SYNC,
   sparx5, PTP_PTP_PIN_CFG(consts->tod_pin));

 s = spx5_rd(sparx5, PTP_PTP_TOD_SEC_MSB(consts->tod_pin));
 s <<= 32;
 s |= spx5_rd(sparx5, PTP_PTP_TOD_SEC_LSB(consts->tod_pin));
 ns = spx5_rd(sparx5, PTP_PTP_TOD_NSEC(consts->tod_pin));
 ns &= PTP_PTP_TOD_NSEC_PTP_TOD_NSEC;

 spin_unlock_irqrestore(&sparx5->ptp_clock_lock, flags);

 /* Deal with negative values */
 if ((ns & 0xFFFFFFF0) == 0x3FFFFFF0) {
  s--;
  ns &= 0xf;
  ns += 999999984;
 }

 set_normalized_timespec64(ts, s, ns);
 return 0;
}

static int sparx5_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
 struct sparx5_phc *phc = container_of(ptp, struct sparx5_phc, info);
 struct sparx5 *sparx5 = phc->sparx5;
 const struct sparx5_consts *consts;

 consts = sparx5->data->consts;

 if (delta > -(NSEC_PER_SEC / 2) && delta < (NSEC_PER_SEC / 2)) {
  unsigned long flags;

  spin_lock_irqsave(&sparx5->ptp_clock_lock, flags);

  /* Must be in IDLE mode before the time can be loaded */
  spx5_rmw(PTP_PTP_PIN_CFG_PTP_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
    PTP_PTP_PIN_CFG_PTP_PIN_DOM_SET(phc->index) |
    PTP_PTP_PIN_CFG_PTP_PIN_SYNC_SET(0),
    PTP_PTP_PIN_CFG_PTP_PIN_ACTION |
    PTP_PTP_PIN_CFG_PTP_PIN_DOM |
    PTP_PTP_PIN_CFG_PTP_PIN_SYNC,
    sparx5, PTP_PTP_PIN_CFG(consts->tod_pin));

  spx5_wr(PTP_PTP_TOD_NSEC_PTP_TOD_NSEC_SET(delta),
   sparx5, PTP_PTP_TOD_NSEC(consts->tod_pin));

  /* Adjust time with the value of PTP_TOD_NSEC */
  spx5_rmw(PTP_PTP_PIN_CFG_PTP_PIN_ACTION_SET(PTP_PIN_ACTION_DELTA) |
    PTP_PTP_PIN_CFG_PTP_PIN_DOM_SET(phc->index) |
    PTP_PTP_PIN_CFG_PTP_PIN_SYNC_SET(0),
    PTP_PTP_PIN_CFG_PTP_PIN_ACTION |
    PTP_PTP_PIN_CFG_PTP_PIN_DOM |
    PTP_PTP_PIN_CFG_PTP_PIN_SYNC,
    sparx5, PTP_PTP_PIN_CFG(consts->tod_pin));

  spin_unlock_irqrestore(&sparx5->ptp_clock_lock, flags);
 } else {
  /* Fall back using sparx5_ptp_settime64 which is not exact */
  struct timespec64 ts;
  u64 now;

  sparx5_ptp_gettime64(ptp, &ts);

  now = ktime_to_ns(timespec64_to_ktime(ts));
  ts = ns_to_timespec64(now + delta);

  sparx5_ptp_settime64(ptp, &ts);
 }

 return 0;
}

static struct ptp_clock_info sparx5_ptp_clock_info = {
 .owner  = THIS_MODULE,
 .name  = "sparx5 ptp",
 .max_adj = 200000,
 .gettime64 = sparx5_ptp_gettime64,
 .settime64 = sparx5_ptp_settime64,
 .adjtime = sparx5_ptp_adjtime,
 .adjfine = sparx5_ptp_adjfine,
};

static int sparx5_ptp_phc_init(struct sparx5 *sparx5,
          int index,
          struct ptp_clock_info *clock_info)
{
 struct sparx5_phc *phc = &sparx5->phc[index];

 phc->info = *clock_info;
 phc->clock = ptp_clock_register(&phc->info, sparx5->dev);
 if (IS_ERR(phc->clock))
  return PTR_ERR(phc->clock);

 phc->index = index;
 phc->sparx5 = sparx5;

 /* PTP Rx stamping is always enabled.  */
 phc->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;

 return 0;
}

int sparx5_ptp_init(struct sparx5 *sparx5)
{
 u64 tod_adj = sparx5_ptp_get_nominal_value(sparx5);
 struct sparx5_port *port;
 int err, i;

 if (!sparx5->ptp)
  return 0;

 for (i = 0; i < SPARX5_PHC_COUNT; ++i) {
  err = sparx5_ptp_phc_init(sparx5, i, &sparx5_ptp_clock_info);
  if (err)
   return err;
 }

 spin_lock_init(&sparx5->ptp_clock_lock);
 spin_lock_init(&sparx5->ptp_ts_id_lock);
 mutex_init(&sparx5->ptp_lock);

 /* Disable master counters */
 spx5_wr(PTP_PTP_DOM_CFG_PTP_ENA_SET(0), sparx5, PTP_PTP_DOM_CFG);

 /* Configure the nominal TOD increment per clock cycle */
 spx5_rmw(PTP_PTP_DOM_CFG_PTP_CLKCFG_DIS_SET(0x7),
   PTP_PTP_DOM_CFG_PTP_CLKCFG_DIS,
   sparx5, PTP_PTP_DOM_CFG);

 for (i = 0; i < SPARX5_PHC_COUNT; ++i) {
  spx5_wr((u32)tod_adj & 0xFFFFFFFF, sparx5,
   PTP_CLK_PER_CFG(i, 0));
  spx5_wr((u32)(tod_adj >> 32), sparx5,
   PTP_CLK_PER_CFG(i, 1));
 }

 spx5_rmw(PTP_PTP_DOM_CFG_PTP_CLKCFG_DIS_SET(0),
   PTP_PTP_DOM_CFG_PTP_CLKCFG_DIS,
   sparx5, PTP_PTP_DOM_CFG);

 /* Enable master counters */
 spx5_wr(PTP_PTP_DOM_CFG_PTP_ENA_SET(0x7), sparx5, PTP_PTP_DOM_CFG);

 for (i = 0; i < sparx5->data->consts->n_ports; i++) {
  port = sparx5->ports[i];
  if (!port)
   continue;

  skb_queue_head_init(&port->tx_skbs);
 }

 return 0;
}

void sparx5_ptp_deinit(struct sparx5 *sparx5)
{
 struct sparx5_port *port;
 int i;

 for (i = 0; i < sparx5->data->consts->n_ports; i++) {
  port = sparx5->ports[i];
  if (!port)
   continue;

  skb_queue_purge(&port->tx_skbs);
 }

 for (i = 0; i < SPARX5_PHC_COUNT; ++i)
  ptp_clock_unregister(sparx5->phc[i].clock);
}

void sparx5_ptp_rxtstamp(struct sparx5 *sparx5, struct sk_buff *skb,
    u64 timestamp)
{
 struct skb_shared_hwtstamps *shhwtstamps;
 struct sparx5_phc *phc;
 struct timespec64 ts;
 u64 full_ts_in_ns;

 if (!sparx5->ptp)
  return;

 phc = &sparx5->phc[SPARX5_PHC_PORT];
 sparx5_ptp_gettime64(&phc->info, &ts);

 if (ts.tv_nsec < timestamp)
  ts.tv_sec--;
 ts.tv_nsec = timestamp;
 full_ts_in_ns = ktime_set(ts.tv_sec, ts.tv_nsec);

 shhwtstamps = skb_hwtstamps(skb);
 shhwtstamps->hwtstamp = full_ts_in_ns;
}