linux/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c

// SPDX-License-Identifier: GPL-2.0-only
/*******************************************************************************
  PTP 1588 clock using the STMMAC.

  Copyright (C) 2013  Vayavya Labs Pvt Ltd


  Author: Rayagond Kokatanur <[email protected]>
*******************************************************************************/
#include "stmmac.h"
#include "stmmac_ptp.h"
#include "dwmac4.h"

/**
 * stmmac_adjust_freq
 *
 * @ptp: pointer to ptp_clock_info structure
 * @scaled_ppm: desired period change in scaled parts per million
 *
 * Description: this function will adjust the frequency of hardware clock.
 *
 * Scaled parts per million is ppm with a 16-bit binary fractional field.
 */
static int stmmac_adjust_freq(struct ptp_clock_info *ptp, long scaled_ppm)
{ … }

/**
 * stmmac_adjust_time
 *
 * @ptp: pointer to ptp_clock_info structure
 * @delta: desired change in nanoseconds
 *
 * Description: this function will shift/adjust the hardware clock time.
 */
static int stmmac_adjust_time(struct ptp_clock_info *ptp, s64 delta)
{ … }

/**
 * stmmac_get_time
 *
 * @ptp: pointer to ptp_clock_info structure
 * @ts: pointer to hold time/result
 *
 * Description: this function will read the current time from the
 * hardware clock and store it in @ts.
 */
static int stmmac_get_time(struct ptp_clock_info *ptp, struct timespec64 *ts)
{ … }

/**
 * stmmac_set_time
 *
 * @ptp: pointer to ptp_clock_info structure
 * @ts: time value to set
 *
 * Description: this function will set the current time on the
 * hardware clock.
 */
static int stmmac_set_time(struct ptp_clock_info *ptp,
			   const struct timespec64 *ts)
{ … }

static int stmmac_enable(struct ptp_clock_info *ptp,
			 struct ptp_clock_request *rq, int on)
{ … }

/**
 * stmmac_get_syncdevicetime
 * @device: current device time
 * @system: system counter value read synchronously with device time
 * @ctx: context provided by timekeeping code
 * Description: Read device and system clock simultaneously and return the
 * corrected clock values in ns.
 **/
static int stmmac_get_syncdevicetime(ktime_t *device,
				     struct system_counterval_t *system,
				     void *ctx)
{ … }

static int stmmac_getcrosststamp(struct ptp_clock_info *ptp,
				 struct system_device_crosststamp *xtstamp)
{ … }

/* structure describing a PTP hardware clock */
static struct ptp_clock_info stmmac_ptp_clock_ops = …;

/**
 * stmmac_ptp_register
 * @priv: driver private structure
 * Description: this function will register the ptp clock driver
 * to kernel. It also does some house keeping work.
 */
void stmmac_ptp_register(struct stmmac_priv *priv)
{ … }

/**
 * stmmac_ptp_unregister
 * @priv: driver private structure
 * Description: this function will remove/unregister the ptp clock driver
 * from the kernel.
 */
void stmmac_ptp_unregister(struct stmmac_priv *priv)
{ … }