octeontx2-pf: Add support for ptp 1-step mode on CN10K silicon

Add support for ptp 1-step mode using timecounter. The seconds and
nanoseconds to be updated in PTP header are calculated by adding the
timecounter offset to the free running PTP clock counter time. The PF
driver periodically gets the PTP clock time using AF mbox. The 1-step
support uses HW feature to update correction field rather than
OriginTimestamp field in PTP header.

Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 61 insertions, 29 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ptp.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ptp.c
index fdc2c9315b91..743c8a6d5dad 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ptp.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ptp.c
@@ -10,6 +10,33 @@
 #include "otx2_common.h"
 #include "otx2_ptp.h"
 
+static u64 otx2_ptp_get_clock(struct otx2_ptp *ptp)
+{
+	struct ptp_req *req;
+	struct ptp_rsp *rsp;
+	int err;
+
+	if (!ptp->nic)
+		return 0;
+
+	req = otx2_mbox_alloc_msg_ptp_op(&ptp->nic->mbox);
+	if (!req)
+		return 0;
+
+	req->op = PTP_OP_GET_CLOCK;
+
+	err = otx2_sync_mbox_msg(&ptp->nic->mbox);
+	if (err)
+		return 0;
+
+	rsp = (struct ptp_rsp *)otx2_mbox_get_rsp(&ptp->nic->mbox.mbox, 0,
+						  &req->hdr);
+	if (IS_ERR(rsp))
+		return 0;
+
+	return rsp->clk;
+}
+
 static int otx2_ptp_adjfine(struct ptp_clock_info *ptp_info, long scaled_ppm)
 {
 	struct otx2_ptp *ptp = container_of(ptp_info, struct otx2_ptp,
@@ -49,29 +76,8 @@ static int ptp_set_thresh(struct otx2_ptp *ptp, u64 thresh)
 static u64 ptp_cc_read(const struct cyclecounter *cc)
 {
 	struct otx2_ptp *ptp = container_of(cc, struct otx2_ptp, cycle_counter);
-	struct ptp_req *req;
-	struct ptp_rsp *rsp;
-	int err;
-
-	if (!ptp->nic)
-		return 0;
-
-	req = otx2_mbox_alloc_msg_ptp_op(&ptp->nic->mbox);
-	if (!req)
-		return 0;
 
-	req->op = PTP_OP_GET_CLOCK;
-
-	err = otx2_sync_mbox_msg(&ptp->nic->mbox);
-	if (err)
-		return 0;
-
-	rsp = (struct ptp_rsp *)otx2_mbox_get_rsp(&ptp->nic->mbox.mbox, 0,
-						  &req->hdr);
-	if (IS_ERR(rsp))
-		return 0;
-
-	return rsp->clk;
+	return otx2_ptp_get_clock(ptp);
 }
 
 static u64 ptp_tstmp_read(struct otx2_ptp *ptp)
@@ -101,6 +107,15 @@ static u64 ptp_tstmp_read(struct otx2_ptp *ptp)
 	return rsp->clk;
 }
 
+static void otx2_get_ptpclock(struct otx2_ptp *ptp, u64 *tstamp)
+{
+	struct otx2_nic *pfvf = ptp->nic;
+
+	mutex_lock(&pfvf->mbox.lock);
+	*tstamp = timecounter_read(&ptp->time_counter);
+	mutex_unlock(&pfvf->mbox.lock);
+}
+
 static int otx2_ptp_adjtime(struct ptp_clock_info *ptp_info, s64 delta)
 {
 	struct otx2_ptp *ptp = container_of(ptp_info, struct otx2_ptp,
@@ -119,14 +134,10 @@ static int otx2_ptp_gettime(struct ptp_clock_info *ptp_info,
 {
 	struct otx2_ptp *ptp = container_of(ptp_info, struct otx2_ptp,
 					    ptp_info);
-	struct otx2_nic *pfvf = ptp->nic;
-	u64 nsec;
+	u64 tstamp;
 
-	mutex_lock(&pfvf->mbox.lock);
-	nsec = timecounter_read(&ptp->time_counter);
-	mutex_unlock(&pfvf->mbox.lock);
-
-	*ts = ns_to_timespec64(nsec);
+	otx2_get_ptpclock(ptp, &tstamp);
+	*ts = ns_to_timespec64(tstamp);
 
 	return 0;
 }
@@ -191,6 +202,23 @@ static void otx2_ptp_extts_check(struct work_struct *work)
 	schedule_delayed_work(&ptp->extts_work, msecs_to_jiffies(200));
 }
 
+static void otx2_sync_tstamp(struct work_struct *work)
+{
+	struct otx2_ptp *ptp = container_of(work, struct otx2_ptp,
+					    synctstamp_work.work);
+	struct otx2_nic *pfvf = ptp->nic;
+	u64 tstamp;
+
+	mutex_lock(&pfvf->mbox.lock);
+	tstamp = otx2_ptp_get_clock(ptp);
+	mutex_unlock(&pfvf->mbox.lock);
+
+	ptp->tstamp = timecounter_cyc2time(&pfvf->ptp->time_counter, tstamp);
+	ptp->base_ns = tstamp % NSEC_PER_SEC;
+
+	schedule_delayed_work(&ptp->synctstamp_work, msecs_to_jiffies(250));
+}
+
 static int otx2_ptp_enable(struct ptp_clock_info *ptp_info,
 			   struct ptp_clock_request *rq, int on)
 {
@@ -302,6 +330,8 @@ int otx2_ptp_init(struct otx2_nic *pfvf)
 		ptp_ptr->convert_tx_ptp_tstmp = &cn10k_ptp_convert_timestamp;
 	}
 
+	INIT_DELAYED_WORK(&ptp_ptr->synctstamp_work, otx2_sync_tstamp);
+
 	pfvf->ptp = ptp_ptr;
 
 error:
@@ -316,6 +346,8 @@ void otx2_ptp_destroy(struct otx2_nic *pfvf)
 	if (!ptp)
 		return;
 
+	cancel_delayed_work(&pfvf->ptp->synctstamp_work);
+
 	ptp_clock_unregister(ptp->ptp_clock);
 	kfree(ptp);
 	pfvf->ptp = NULL;