drivers/net/ethernet/renesas/ravb_ptp.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /* PTP 1588 clock using the Renesas Ethernet AVB
  *
  * Copyright (C) 2013-2015 Renesas Electronics Corporation
  * Copyright (C) 2015 Renesas Solutions Corp.
  * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@cogentembedded.com>
  */

 #include "ravb.h"

 static int ravb_ptp_tcr_request(struct ravb_private *priv, u32 request)
 {
 	struct net_device *ndev = priv->ndev;
 	int error;

 	error = ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
 	if (error)
 		return error;

 	ravb_modify(ndev, GCCR, request, request);
 	return ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
 }

 /* Caller must hold the lock */
 static int ravb_ptp_time_read(struct ravb_private *priv, struct timespec64 *ts)
 {
 	struct net_device *ndev = priv->ndev;
 	int error;

 	error = ravb_ptp_tcr_request(priv, GCCR_TCR_CAPTURE);
 	if (error)
 		return error;

 	ts->tv_nsec = ravb_read(ndev, GCT0);
 	ts->tv_sec  = ravb_read(ndev, GCT1) |
 		((s64)ravb_read(ndev, GCT2) << 32);

 	return 0;
 }

 /* Caller must hold the lock */
 static int ravb_ptp_time_write(struct ravb_private *priv,
 				const struct timespec64 *ts)
 {
 	struct net_device *ndev = priv->ndev;
 	int error;
 	u32 gccr;

 	error = ravb_ptp_tcr_request(priv, GCCR_TCR_RESET);
 	if (error)
 		return error;

 	gccr = ravb_read(ndev, GCCR);
 	if (gccr & GCCR_LTO)
 		return -EBUSY;
 	ravb_write(ndev, ts->tv_nsec, GTO0);
 	ravb_write(ndev, ts->tv_sec,  GTO1);
 	ravb_write(ndev, (ts->tv_sec >> 32) & 0xffff, GTO2);
 	ravb_write(ndev, gccr | GCCR_LTO, GCCR);

 	return 0;
 }

 /* Caller must hold the lock */
 static int ravb_ptp_update_compare(struct ravb_private *priv, u32 ns)
 {
 	struct net_device *ndev = priv->ndev;
 	/* When the comparison value (GPTC.PTCV) is in range of
 	 * [x-1 to x+1] (x is the configured increment value in
 	 * GTI.TIV), it may happen that a comparison match is
 	 * not detected when the timer wraps around.
 	 */
 	u32 gti_ns_plus_1 = (priv->ptp.current_addend >> 20) + 1;
 	u32 gccr;

 	if (ns < gti_ns_plus_1)
 		ns = gti_ns_plus_1;
 	else if (ns > 0 - gti_ns_plus_1)
 		ns = 0 - gti_ns_plus_1;

 	gccr = ravb_read(ndev, GCCR);
 	if (gccr & GCCR_LPTC)
 		return -EBUSY;
 	ravb_write(ndev, ns, GPTC);
 	ravb_write(ndev, gccr | GCCR_LPTC, GCCR);

 	return 0;
 }

 /* PTP clock operations */
 static int ravb_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
 {
 	struct ravb_private *priv = container_of(ptp, struct ravb_private,
 						 ptp.info);
 	struct net_device *ndev = priv->ndev;
 	unsigned long flags;
 	u32 diff, addend;
 	bool neg_adj = false;
 	u32 gccr;

 	if (ppb < 0) {
 		neg_adj = true;
 		ppb = -ppb;
 	}
 	addend = priv->ptp.default_addend;
 	diff = div_u64((u64)addend * ppb, NSEC_PER_SEC);

 	addend = neg_adj ? addend - diff : addend + diff;

 	spin_lock_irqsave(&priv->lock, flags);

 	priv->ptp.current_addend = addend;

 	gccr = ravb_read(ndev, GCCR);
 	if (gccr & GCCR_LTI) {
 		spin_unlock_irqrestore(&priv->lock, flags);
 		return -EBUSY;
 	}
 	ravb_write(ndev, addend & GTI_TIV, GTI);
 	ravb_write(ndev, gccr | GCCR_LTI, GCCR);

 	spin_unlock_irqrestore(&priv->lock, flags);

 	return 0;
 }

 static int ravb_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
 {
 	struct ravb_private *priv = container_of(ptp, struct ravb_private,
 						 ptp.info);
 	struct timespec64 ts;
 	unsigned long flags;
 	int error;

 	spin_lock_irqsave(&priv->lock, flags);
 	error = ravb_ptp_time_read(priv, &ts);
 	if (!error) {
 		u64 now = ktime_to_ns(timespec64_to_ktime(ts));

 		ts = ns_to_timespec64(now + delta);
 		error = ravb_ptp_time_write(priv, &ts);
 	}
 	spin_unlock_irqrestore(&priv->lock, flags);

 	return error;
 }

 static int ravb_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts)
 {
 	struct ravb_private *priv = container_of(ptp, struct ravb_private,
 						 ptp.info);
 	unsigned long flags;
 	int error;

 	spin_lock_irqsave(&priv->lock, flags);
 	error = ravb_ptp_time_read(priv, ts);
 	spin_unlock_irqrestore(&priv->lock, flags);

 	return error;
 }

 static int ravb_ptp_settime64(struct ptp_clock_info *ptp,
 			      const struct timespec64 *ts)
 {
 	struct ravb_private *priv = container_of(ptp, struct ravb_private,
 						 ptp.info);
 	unsigned long flags;
 	int error;

 	spin_lock_irqsave(&priv->lock, flags);
 	error = ravb_ptp_time_write(priv, ts);
 	spin_unlock_irqrestore(&priv->lock, flags);

 	return error;
 }

 static int ravb_ptp_extts(struct ptp_clock_info *ptp,
 			  struct ptp_extts_request *req, int on)
 {
 	struct ravb_private *priv = container_of(ptp, struct ravb_private,
 						 ptp.info);
 	struct net_device *ndev = priv->ndev;
 	unsigned long flags;

 	if (req->index)
 		return -EINVAL;

 	if (priv->ptp.extts[req->index] == on)
 		return 0;
 	priv->ptp.extts[req->index] = on;

 	spin_lock_irqsave(&priv->lock, flags);
 	if (priv->chip_id == RCAR_GEN2)
 		ravb_modify(ndev, GIC, GIC_PTCE, on ? GIC_PTCE : 0);
 	else if (on)
 		ravb_write(ndev, GIE_PTCS, GIE);
 	else
 		ravb_write(ndev, GID_PTCD, GID);
 	mmiowb();
 	spin_unlock_irqrestore(&priv->lock, flags);

 	return 0;
 }

 static int ravb_ptp_perout(struct ptp_clock_info *ptp,
 			   struct ptp_perout_request *req, int on)
 {
 	struct ravb_private *priv = container_of(ptp, struct ravb_private,
 						 ptp.info);
 	struct net_device *ndev = priv->ndev;
 	struct ravb_ptp_perout *perout;
 	unsigned long flags;
 	int error = 0;

 	if (req->index)
 		return -EINVAL;

 	if (on) {
 		u64 start_ns;
 		u64 period_ns;

 		start_ns = req->start.sec * NSEC_PER_SEC + req->start.nsec;
 		period_ns = req->period.sec * NSEC_PER_SEC + req->period.nsec;

 		if (start_ns > U32_MAX) {
 			netdev_warn(ndev,
 				    "ptp: start value (nsec) is over limit. Maximum size of start is only 32 bits\n");
 			return -ERANGE;
 		}

 		if (period_ns > U32_MAX) {
 			netdev_warn(ndev,
 				    "ptp: period value (nsec) is over limit. Maximum size of period is only 32 bits\n");
 			return -ERANGE;
 		}

 		spin_lock_irqsave(&priv->lock, flags);

 		perout = &priv->ptp.perout[req->index];
 		perout->target = (u32)start_ns;
 		perout->period = (u32)period_ns;
 		error = ravb_ptp_update_compare(priv, (u32)start_ns);
 		if (!error) {
 			/* Unmask interrupt */
 			if (priv->chip_id == RCAR_GEN2)
 				ravb_modify(ndev, GIC, GIC_PTME, GIC_PTME);
 			else
 				ravb_write(ndev, GIE_PTMS0, GIE);
 		}
 	} else	{
 		spin_lock_irqsave(&priv->lock, flags);

 		perout = &priv->ptp.perout[req->index];
 		perout->period = 0;

 		/* Mask interrupt */
 		if (priv->chip_id == RCAR_GEN2)
 			ravb_modify(ndev, GIC, GIC_PTME, 0);
 		else
 			ravb_write(ndev, GID_PTMD0, GID);
 	}
 	mmiowb();
 	spin_unlock_irqrestore(&priv->lock, flags);

 	return error;
 }

 static int ravb_ptp_enable(struct ptp_clock_info *ptp,
 			   struct ptp_clock_request *req, int on)
 {
 	switch (req->type) {
 	case PTP_CLK_REQ_EXTTS:
 		return ravb_ptp_extts(ptp, &req->extts, on);
 	case PTP_CLK_REQ_PEROUT:
 		return ravb_ptp_perout(ptp, &req->perout, on);
 	default:
 		return -EOPNOTSUPP;
 	}
 }

 static const struct ptp_clock_info ravb_ptp_info = {
 	.owner		= THIS_MODULE,
 	.name		= "ravb clock",
 	.max_adj	= 50000000,
 	.n_ext_ts	= N_EXT_TS,
 	.n_per_out	= N_PER_OUT,
 	.adjfreq	= ravb_ptp_adjfreq,
 	.adjtime	= ravb_ptp_adjtime,
 	.gettime64	= ravb_ptp_gettime64,
 	.settime64	= ravb_ptp_settime64,
 	.enable		= ravb_ptp_enable,
 };

 /* Caller must hold the lock */
 void ravb_ptp_interrupt(struct net_device *ndev)
 {
 	struct ravb_private *priv = netdev_priv(ndev);
 	u32 gis = ravb_read(ndev, GIS);

 	gis &= ravb_read(ndev, GIC);
 	if (gis & GIS_PTCF) {
 		struct ptp_clock_event event;

 		event.type = PTP_CLOCK_EXTTS;
 		event.index = 0;
 		event.timestamp = ravb_read(ndev, GCPT);
 		ptp_clock_event(priv->ptp.clock, &event);
 	}
 	if (gis & GIS_PTMF) {
 		struct ravb_ptp_perout *perout = priv->ptp.perout;

 		if (perout->period) {
 			perout->target += perout->period;
 			ravb_ptp_update_compare(priv, perout->target);
 		}
 	}

 	ravb_write(ndev, ~(gis | GIS_RESERVED), GIS);
 }

 void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev)
 {
 	struct ravb_private *priv = netdev_priv(ndev);
 	unsigned long flags;

 	priv->ptp.info = ravb_ptp_info;

 	priv->ptp.default_addend = ravb_read(ndev, GTI);
 	priv->ptp.current_addend = priv->ptp.default_addend;

 	spin_lock_irqsave(&priv->lock, flags);
 	ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
 	ravb_modify(ndev, GCCR, GCCR_TCSS, GCCR_TCSS_ADJGPTP);
 	mmiowb();
 	spin_unlock_irqrestore(&priv->lock, flags);

 	priv->ptp.clock = ptp_clock_register(&priv->ptp.info, &pdev->dev);
 }

 void ravb_ptp_stop(struct net_device *ndev)
 {
 	struct ravb_private *priv = netdev_priv(ndev);

 	ravb_write(ndev, 0, GIC);
 	ravb_write(ndev, 0, GIS);

 	ptp_clock_unregister(priv->ptp.clock);
 }
	// SPDX-License-Identifier: GPL-2.0+
	/* PTP 1588 clock using the Renesas Ethernet AVB
	*
	* Copyright (C) 2013-2015 Renesas Electronics Corporation
	* Copyright (C) 2015 Renesas Solutions Corp.
	* Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@cogentembedded.com>
	*/

	#include "ravb.h"

	static int ravb_ptp_tcr_request(struct ravb_private *priv, u32 request)
	{
	struct net_device *ndev = priv->ndev;
	int error;

	error = ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
	if (error)
	return error;

	ravb_modify(ndev, GCCR, request, request);
	return ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
	}

	/* Caller must hold the lock */
	static int ravb_ptp_time_read(struct ravb_private priv, struct timespec64 ts)
	{
	struct net_device *ndev = priv->ndev;
	int error;

	error = ravb_ptp_tcr_request(priv, GCCR_TCR_CAPTURE);
	if (error)
	return error;

	ts->tv_nsec = ravb_read(ndev, GCT0);
	ts->tv_sec = ravb_read(ndev, GCT1) \|
	((s64)ravb_read(ndev, GCT2) << 32);

	return 0;
	}

	/* Caller must hold the lock */
	static int ravb_ptp_time_write(struct ravb_private *priv,
	const struct timespec64 *ts)
	{
	struct net_device *ndev = priv->ndev;
	int error;
	u32 gccr;

	error = ravb_ptp_tcr_request(priv, GCCR_TCR_RESET);
	if (error)
	return error;

	gccr = ravb_read(ndev, GCCR);
	if (gccr & GCCR_LTO)
	return -EBUSY;
	ravb_write(ndev, ts->tv_nsec, GTO0);
	ravb_write(ndev, ts->tv_sec, GTO1);
	ravb_write(ndev, (ts->tv_sec >> 32) & 0xffff, GTO2);
	ravb_write(ndev, gccr \| GCCR_LTO, GCCR);

	return 0;
	}

	/* Caller must hold the lock */
	static int ravb_ptp_update_compare(struct ravb_private *priv, u32 ns)
	{
	struct net_device *ndev = priv->ndev;
	/* When the comparison value (GPTC.PTCV) is in range of
	* [x-1 to x+1] (x is the configured increment value in
	* GTI.TIV), it may happen that a comparison match is
	* not detected when the timer wraps around.
	*/
	u32 gti_ns_plus_1 = (priv->ptp.current_addend >> 20) + 1;
	u32 gccr;

	if (ns < gti_ns_plus_1)
	ns = gti_ns_plus_1;
	else if (ns > 0 - gti_ns_plus_1)
	ns = 0 - gti_ns_plus_1;

	gccr = ravb_read(ndev, GCCR);
	if (gccr & GCCR_LPTC)
	return -EBUSY;
	ravb_write(ndev, ns, GPTC);
	ravb_write(ndev, gccr \| GCCR_LPTC, GCCR);

	return 0;
	}

	/* PTP clock operations */
	static int ravb_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
	{
	struct ravb_private *priv = container_of(ptp, struct ravb_private,
	ptp.info);
	struct net_device *ndev = priv->ndev;
	unsigned long flags;
	u32 diff, addend;
	bool neg_adj = false;
	u32 gccr;

	if (ppb < 0) {
	neg_adj = true;
	ppb = -ppb;
	}
	addend = priv->ptp.default_addend;
	diff = div_u64((u64)addend * ppb, NSEC_PER_SEC);

	addend = neg_adj ? addend - diff : addend + diff;

	spin_lock_irqsave(&priv->lock, flags);

	priv->ptp.current_addend = addend;

	gccr = ravb_read(ndev, GCCR);
	if (gccr & GCCR_LTI) {
	spin_unlock_irqrestore(&priv->lock, flags);
	return -EBUSY;
	}
	ravb_write(ndev, addend & GTI_TIV, GTI);
	ravb_write(ndev, gccr \| GCCR_LTI, GCCR);

	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
	}

	static int ravb_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
	{
	struct ravb_private *priv = container_of(ptp, struct ravb_private,
	ptp.info);
	struct timespec64 ts;
	unsigned long flags;
	int error;

	spin_lock_irqsave(&priv->lock, flags);
	error = ravb_ptp_time_read(priv, &ts);
	if (!error) {
	u64 now = ktime_to_ns(timespec64_to_ktime(ts));

	ts = ns_to_timespec64(now + delta);
	error = ravb_ptp_time_write(priv, &ts);
	}
	spin_unlock_irqrestore(&priv->lock, flags);

	return error;
	}

	static int ravb_ptp_gettime64(struct ptp_clock_info ptp, struct timespec64 ts)
	{
	struct ravb_private *priv = container_of(ptp, struct ravb_private,
	ptp.info);
	unsigned long flags;
	int error;

	spin_lock_irqsave(&priv->lock, flags);
	error = ravb_ptp_time_read(priv, ts);
	spin_unlock_irqrestore(&priv->lock, flags);

	return error;
	}

	static int ravb_ptp_settime64(struct ptp_clock_info *ptp,
	const struct timespec64 *ts)
	{
	struct ravb_private *priv = container_of(ptp, struct ravb_private,
	ptp.info);
	unsigned long flags;
	int error;

	spin_lock_irqsave(&priv->lock, flags);
	error = ravb_ptp_time_write(priv, ts);
	spin_unlock_irqrestore(&priv->lock, flags);

	return error;
	}

	static int ravb_ptp_extts(struct ptp_clock_info *ptp,
	struct ptp_extts_request *req, int on)
	{
	struct ravb_private *priv = container_of(ptp, struct ravb_private,
	ptp.info);
	struct net_device *ndev = priv->ndev;
	unsigned long flags;

	if (req->index)
	return -EINVAL;

	if (priv->ptp.extts[req->index] == on)
	return 0;
	priv->ptp.extts[req->index] = on;

	spin_lock_irqsave(&priv->lock, flags);
	if (priv->chip_id == RCAR_GEN2)
	ravb_modify(ndev, GIC, GIC_PTCE, on ? GIC_PTCE : 0);
	else if (on)
	ravb_write(ndev, GIE_PTCS, GIE);
	else
	ravb_write(ndev, GID_PTCD, GID);
	mmiowb();
	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
	}

	static int ravb_ptp_perout(struct ptp_clock_info *ptp,
	struct ptp_perout_request *req, int on)
	{
	struct ravb_private *priv = container_of(ptp, struct ravb_private,
	ptp.info);
	struct net_device *ndev = priv->ndev;
	struct ravb_ptp_perout *perout;
	unsigned long flags;
	int error = 0;

	if (req->index)
	return -EINVAL;

	if (on) {
	u64 start_ns;
	u64 period_ns;

	start_ns = req->start.sec * NSEC_PER_SEC + req->start.nsec;
	period_ns = req->period.sec * NSEC_PER_SEC + req->period.nsec;

	if (start_ns > U32_MAX) {
	netdev_warn(ndev,
	"ptp: start value (nsec) is over limit. Maximum size of start is only 32 bits\n");
	return -ERANGE;
	}

	if (period_ns > U32_MAX) {
	netdev_warn(ndev,
	"ptp: period value (nsec) is over limit. Maximum size of period is only 32 bits\n");
	return -ERANGE;
	}

	spin_lock_irqsave(&priv->lock, flags);

	perout = &priv->ptp.perout[req->index];
	perout->target = (u32)start_ns;
	perout->period = (u32)period_ns;
	error = ravb_ptp_update_compare(priv, (u32)start_ns);
	if (!error) {
	/* Unmask interrupt */
	if (priv->chip_id == RCAR_GEN2)
	ravb_modify(ndev, GIC, GIC_PTME, GIC_PTME);
	else
	ravb_write(ndev, GIE_PTMS0, GIE);
	}
	} else {
	spin_lock_irqsave(&priv->lock, flags);

	perout = &priv->ptp.perout[req->index];
	perout->period = 0;

	/* Mask interrupt */
	if (priv->chip_id == RCAR_GEN2)
	ravb_modify(ndev, GIC, GIC_PTME, 0);
	else
	ravb_write(ndev, GID_PTMD0, GID);
	}
	mmiowb();
	spin_unlock_irqrestore(&priv->lock, flags);

	return error;
	}

	static int ravb_ptp_enable(struct ptp_clock_info *ptp,
	struct ptp_clock_request *req, int on)
	{
	switch (req->type) {
	case PTP_CLK_REQ_EXTTS:
	return ravb_ptp_extts(ptp, &req->extts, on);
	case PTP_CLK_REQ_PEROUT:
	return ravb_ptp_perout(ptp, &req->perout, on);
	default:
	return -EOPNOTSUPP;
	}
	}

	static const struct ptp_clock_info ravb_ptp_info = {
	.owner = THIS_MODULE,
	.name = "ravb clock",
	.max_adj = 50000000,
	.n_ext_ts = N_EXT_TS,
	.n_per_out = N_PER_OUT,
	.adjfreq = ravb_ptp_adjfreq,
	.adjtime = ravb_ptp_adjtime,
	.gettime64 = ravb_ptp_gettime64,
	.settime64 = ravb_ptp_settime64,
	.enable = ravb_ptp_enable,
	};

	/* Caller must hold the lock */
	void ravb_ptp_interrupt(struct net_device *ndev)
	{
	struct ravb_private *priv = netdev_priv(ndev);
	u32 gis = ravb_read(ndev, GIS);

	gis &= ravb_read(ndev, GIC);
	if (gis & GIS_PTCF) {
	struct ptp_clock_event event;

	event.type = PTP_CLOCK_EXTTS;
	event.index = 0;
	event.timestamp = ravb_read(ndev, GCPT);
	ptp_clock_event(priv->ptp.clock, &event);
	}
	if (gis & GIS_PTMF) {
	struct ravb_ptp_perout *perout = priv->ptp.perout;

	if (perout->period) {
	perout->target += perout->period;
	ravb_ptp_update_compare(priv, perout->target);
	}
	}

	ravb_write(ndev, ~(gis \| GIS_RESERVED), GIS);
	}

	void ravb_ptp_init(struct net_device ndev, struct platform_device pdev)
	{
	struct ravb_private *priv = netdev_priv(ndev);
	unsigned long flags;

	priv->ptp.info = ravb_ptp_info;

	priv->ptp.default_addend = ravb_read(ndev, GTI);
	priv->ptp.current_addend = priv->ptp.default_addend;

	spin_lock_irqsave(&priv->lock, flags);
	ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
	ravb_modify(ndev, GCCR, GCCR_TCSS, GCCR_TCSS_ADJGPTP);
	mmiowb();
	spin_unlock_irqrestore(&priv->lock, flags);

	priv->ptp.clock = ptp_clock_register(&priv->ptp.info, &pdev->dev);
	}

	void ravb_ptp_stop(struct net_device *ndev)
	{
	struct ravb_private *priv = netdev_priv(ndev);

	ravb_write(ndev, 0, GIC);
	ravb_write(ndev, 0, GIS);

	ptp_clock_unregister(priv->ptp.clock);
	}