Commit 64433e5b authored by Ederson de Souza's avatar Ederson de Souza Committed by Tony Nguyen
Browse files

igc: Enable internal i225 PPS 



The i225 device can produce one interrupt on the full second, much
like i210 - from where this patch is inspired.

This patch sets up the full second interruption on the i225 and when
receiving it, it sends a PPS event to PTP (Precision Time Protocol)
kernel subsystem.

The PTP subsystem exposes the PPS events via ioctl and sysfs, and one
can use the `testptp` tool (tools/testing/selftests/ptp) to check that
the events are being generated.

Signed-off-by: default avatarEderson de Souza <ederson.desouza@intel.com>
Tested-by: default avatarDvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Signed-off-by: default avatarTony Nguyen <anthony.l.nguyen@intel.com>
parent 1d3cb90c

drivers/net/ethernet/intel/igc/igc.h

+2 −0
Original line number Diff line number Diff line
@@ -223,6 +223,8 @@ struct igc_adapter { 
	char fw_version[32];



	struct bpf_prog *xdp_prog;



	bool pps_sys_wrap_on;

};



void igc_up(struct igc_adapter *adapter);

drivers/net/ethernet/intel/igc/igc_main.c

+8 −0
Original line number Diff line number Diff line
@@ -4251,9 +4251,17 @@ igc_features_check(struct sk_buff *skb, struct net_device *dev, 
static void igc_tsync_interrupt(struct igc_adapter *adapter)

{

	struct igc_hw *hw = &adapter->hw;

	struct ptp_clock_event event;

	u32 tsicr = rd32(IGC_TSICR);

	u32 ack = 0;



	if (tsicr & IGC_TSICR_SYS_WRAP) {

		event.type = PTP_CLOCK_PPS;

		if (adapter->ptp_caps.pps)

			ptp_clock_event(adapter->ptp_clock, &event);

		ack |= IGC_TSICR_SYS_WRAP;

	}



	if (tsicr & IGC_TSICR_TXTS) {

		/* retrieve hardware timestamp */

		schedule_work(&adapter->ptp_tx_work);

drivers/net/ethernet/intel/igc/igc_ptp.c

+27 −1
Original line number Diff line number Diff line
@@ -123,6 +123,29 @@ static int igc_ptp_settime_i225(struct ptp_clock_info *ptp, 
static int igc_ptp_feature_enable_i225(struct ptp_clock_info *ptp,

				       struct ptp_clock_request *rq, int on)

{

	struct igc_adapter *igc =

		container_of(ptp, struct igc_adapter, ptp_caps);

	struct igc_hw *hw = &igc->hw;

	unsigned long flags;

	u32 tsim;



	switch (rq->type) {

	case PTP_CLK_REQ_PPS:

		spin_lock_irqsave(&igc->tmreg_lock, flags);

		tsim = rd32(IGC_TSIM);

		if (on)

			tsim |= IGC_TSICR_SYS_WRAP;

		else

			tsim &= ~IGC_TSICR_SYS_WRAP;

		igc->pps_sys_wrap_on = on;

		wr32(IGC_TSIM, tsim);

		spin_unlock_irqrestore(&igc->tmreg_lock, flags);

		return 0;



	default:

		break;

	}



	return -EOPNOTSUPP;

}
@@ -497,6 +520,7 @@ void igc_ptp_init(struct igc_adapter *adapter) 
		adapter->ptp_caps.gettimex64 = igc_ptp_gettimex64_i225;

		adapter->ptp_caps.settime64 = igc_ptp_settime_i225;

		adapter->ptp_caps.enable = igc_ptp_feature_enable_i225;

		adapter->ptp_caps.pps = 1;

		break;

	default:

		adapter->ptp_clock = NULL;
@@ -598,7 +622,9 @@ void igc_ptp_reset(struct igc_adapter *adapter) 
	case igc_i225:

		wr32(IGC_TSAUXC, 0x0);

		wr32(IGC_TSSDP, 0x0);

		wr32(IGC_TSIM, IGC_TSICR_INTERRUPTS);

		wr32(IGC_TSIM,

		     IGC_TSICR_INTERRUPTS |

		     (adapter->pps_sys_wrap_on ? IGC_TSICR_SYS_WRAP : 0));

		wr32(IGC_IMS, IGC_IMS_TS);

		break;

	default: