netdev - [net-next 08/15] igb: enable internal PPS for the i210

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Message-Id: <1421980631-1955-9-git-send-email-jeffrey.t.kirsher@intel.com>
Date:	Thu, 22 Jan 2015 18:37:04 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org,
	nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 08/15] igb: enable internal PPS for the i210

From: Richard Cochran <richardcochran@...il.com>

The i210 device can produce an interrupt on the full second. This
patch allows using this interrupt to generate an internal PPS event
for adjusting the kernel system time.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 18 ++++++++++++++---
 drivers/net/ethernet/intel/igb/igb_ptp.c  | 32 +++++++++++++++++++++++++++++--
 2 files changed, 45 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 135ac5c..e844162 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -5387,14 +5387,26 @@ void igb_update_stats(struct igb_adapter *adapter,
 static void igb_tsync_interrupt(struct igb_adapter *adapter)
 {
 	struct e1000_hw *hw = &adapter->hw;
-	u32 tsicr = rd32(E1000_TSICR);
+	struct ptp_clock_event event;
+	u32 ack = 0, tsicr = rd32(E1000_TSICR);
+
+	if (tsicr & TSINTR_SYS_WRAP) {
+		event.type = PTP_CLOCK_PPS;
+		if (adapter->ptp_caps.pps)
+			ptp_clock_event(adapter->ptp_clock, &event);
+		else
+			dev_err(&adapter->pdev->dev, "unexpected SYS WRAP");
+		ack |= TSINTR_SYS_WRAP;
+	}
 
 	if (tsicr & E1000_TSICR_TXTS) {
-		/* acknowledge the interrupt */
-		wr32(E1000_TSICR, E1000_TSICR_TXTS);
 		/* retrieve hardware timestamp */
 		schedule_work(&adapter->ptp_tx_work);
+		ack |= E1000_TSICR_TXTS;
 	}
+
+	/* acknowledge the interrupts */
+	wr32(E1000_TSICR, ack);
 }
 
 static irqreturn_t igb_msix_other(int irq, void *data)
diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index 8389bb4..98c58d9 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -355,6 +355,34 @@ static int igb_ptp_settime_i210(struct ptp_clock_info *ptp,
 	return 0;
 }
 
+static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
+				       struct ptp_clock_request *rq, int on)
+{
+	struct igb_adapter *igb =
+		container_of(ptp, struct igb_adapter, ptp_caps);
+	struct e1000_hw *hw = &igb->hw;
+	unsigned long flags;
+	u32 tsim;
+
+	switch (rq->type) {
+	case PTP_CLK_REQ_PPS:
+		spin_lock_irqsave(&igb->tmreg_lock, flags);
+		tsim = rd32(E1000_TSIM);
+		if (on)
+			tsim |= TSINTR_SYS_WRAP;
+		else
+			tsim &= ~TSINTR_SYS_WRAP;
+		wr32(E1000_TSIM, tsim);
+		spin_unlock_irqrestore(&igb->tmreg_lock, flags);
+		return 0;
+
+	default:
+		break;
+	}
+
+	return -EOPNOTSUPP;
+}
+
 static int igb_ptp_feature_enable(struct ptp_clock_info *ptp,
 				  struct ptp_clock_request *rq, int on)
 {
@@ -797,12 +825,12 @@ void igb_ptp_init(struct igb_adapter *adapter)
 		adapter->ptp_caps.owner = THIS_MODULE;
 		adapter->ptp_caps.max_adj = 62499999;
 		adapter->ptp_caps.n_ext_ts = 0;
-		adapter->ptp_caps.pps = 0;
+		adapter->ptp_caps.pps = 1;
 		adapter->ptp_caps.adjfreq = igb_ptp_adjfreq_82580;
 		adapter->ptp_caps.adjtime = igb_ptp_adjtime_i210;
 		adapter->ptp_caps.gettime = igb_ptp_gettime_i210;
 		adapter->ptp_caps.settime = igb_ptp_settime_i210;
-		adapter->ptp_caps.enable = igb_ptp_feature_enable;
+		adapter->ptp_caps.enable = igb_ptp_feature_enable_i210;
 		/* Enable the timer functions by clearing bit 31. */
 		wr32(E1000_TSAUXC, 0x0);
 		break;
-- 
1.9.3

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