Merge branch '1GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-

queue

Tony Nguyen says:

====================
1GbE Intel Wired LAN Driver Updates 2021-12-29

Ruud Bos says:

The igb driver provides support for PEROUT and EXTTS pin functions that
allow adapter external use of timing signals. At Hottinger Bruel & Kjaer we
are using the PEROUT function to feed a PTP corrected 1pps signal into an
FPGA as cross system synchronized time source.

Support for the PEROUT and EXTTS SDP functions is currently limited to
i210/i211 based adapters. This patch series enables these functions also
for 82580/i354/i350 based ones. Because the time registers of these
adapters do not have the nice split in second rollovers as the i210 has,
the implementation is slightly more complex compared to the i210
implementation.

The PEROUT function has been successfully tested on an i350 based ethernet
adapter. Using the following user space code excerpt, the driver outputs a
PTP corrected 1pps signal on the SDP0 pin of an i350:

    struct ptp_pin_desc desc;
    memset(&desc, 0, sizeof(desc));
    desc.index = 0;
    desc.func = PTP_PF_PEROUT;
    desc.chan = 0;
    if (ioctl(fd, PTP_PIN_SETFUNC, &desc) == 0) {
        struct timespec ts;
        if (clock_gettime(clkid, &ts) == 0) {
            struct ptp_perout_request rq;
            memset(&rq, 0, sizeof(rq));
            rq.index = 0;
            rq.start.sec = ts.tv_sec + 1;
            rq.start.nsec = 500000000;
            rq.period.sec  = 1;
            rq.period.nsec = 0;
            if (ioctl(fd, PTP_PEROUT_REQUEST, &rq) == 0) {
                /* 1pps signal is now available on SDP0 */
            }
        }
    }

The added EXTTS function has not been tested. However, looking at the data
sheets, the layout of the registers involved match the i210 exactly except
for the time registers mentioned before. Hence the almost identical
implementation.

---
Note: I made changes to fix RCT and checkpatch messages regarding
unnecessary parenthesis.
====================

Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 113 insertions, 35 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 47ece02fce99..4603ae35fcab 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -6739,12 +6739,119 @@ void igb_update_stats(struct igb_adapter *adapter)
 	}
 }
 
-static void igb_tsync_interrupt(struct igb_adapter *adapter)
+static void igb_perout(struct igb_adapter *adapter, int tsintr_tt)
 {
+	int pin = ptp_find_pin(adapter->ptp_clock, PTP_PF_PEROUT, tsintr_tt);
+	struct e1000_hw *hw = &adapter->hw;
+	struct timespec64 ts;
+	u32 tsauxc;
+
+	if (pin < 0 || pin >= IGB_N_PEROUT)
+		return;
+
+	spin_lock(&adapter->tmreg_lock);
+
+	if (hw->mac.type == e1000_82580 ||
+	    hw->mac.type == e1000_i354 ||
+	    hw->mac.type == e1000_i350) {
+		s64 ns = timespec64_to_ns(&adapter->perout[pin].period);
+		u32 systiml, systimh, level_mask, level, rem;
+		u64 systim, now;
+
+		/* read systim registers in sequence */
+		rd32(E1000_SYSTIMR);
+		systiml = rd32(E1000_SYSTIML);
+		systimh = rd32(E1000_SYSTIMH);
+		systim = (((u64)(systimh & 0xFF)) << 32) | ((u64)systiml);
+		now = timecounter_cyc2time(&adapter->tc, systim);
+
+		if (pin < 2) {
+			level_mask = (tsintr_tt == 1) ? 0x80000 : 0x40000;
+			level = (rd32(E1000_CTRL) & level_mask) ? 1 : 0;
+		} else {
+			level_mask = (tsintr_tt == 1) ? 0x80 : 0x40;
+			level = (rd32(E1000_CTRL_EXT) & level_mask) ? 1 : 0;
+		}
+
+		div_u64_rem(now, ns, &rem);
+		systim = systim + (ns - rem);
+
+		/* synchronize pin level with rising/falling edges */
+		div_u64_rem(now, ns << 1, &rem);
+		if (rem < ns) {
+			/* first half of period */
+			if (level == 0) {
+				/* output is already low, skip this period */
+				systim += ns;
+				pr_notice("igb: periodic output on %s missed falling edge\n",
+					  adapter->sdp_config[pin].name);
+			}
+		} else {
+			/* second half of period */
+			if (level == 1) {
+				/* output is already high, skip this period */
+				systim += ns;
+				pr_notice("igb: periodic output on %s missed rising edge\n",
+					  adapter->sdp_config[pin].name);
+			}
+		}
+
+		/* for this chip family tv_sec is the upper part of the binary value,
+		 * so not seconds
+		 */
+		ts.tv_nsec = (u32)systim;
+		ts.tv_sec  = ((u32)(systim >> 32)) & 0xFF;
+	} else {
+		ts = timespec64_add(adapter->perout[pin].start,
+				    adapter->perout[pin].period);
+	}
+
+	/* u32 conversion of tv_sec is safe until y2106 */
+	wr32((tsintr_tt == 1) ? E1000_TRGTTIML1 : E1000_TRGTTIML0, ts.tv_nsec);
+	wr32((tsintr_tt == 1) ? E1000_TRGTTIMH1 : E1000_TRGTTIMH0, (u32)ts.tv_sec);
+	tsauxc = rd32(E1000_TSAUXC);
+	tsauxc |= TSAUXC_EN_TT0;
+	wr32(E1000_TSAUXC, tsauxc);
+	adapter->perout[pin].start = ts;
+
+	spin_unlock(&adapter->tmreg_lock);
+}
+
+static void igb_extts(struct igb_adapter *adapter, int tsintr_tt)
+{
+	int pin = ptp_find_pin(adapter->ptp_clock, PTP_PF_EXTTS, tsintr_tt);
+	int auxstmpl = (tsintr_tt == 1) ? E1000_AUXSTMPL1 : E1000_AUXSTMPL0;
+	int auxstmph = (tsintr_tt == 1) ? E1000_AUXSTMPH1 : E1000_AUXSTMPH0;
 	struct e1000_hw *hw = &adapter->hw;
 	struct ptp_clock_event event;
 	struct timespec64 ts;
-	u32 ack = 0, tsauxc, sec, nsec, tsicr = rd32(E1000_TSICR);
+
+	if (pin < 0 || pin >= IGB_N_EXTTS)
+		return;
+
+	if (hw->mac.type == e1000_82580 ||
+	    hw->mac.type == e1000_i354 ||
+	    hw->mac.type == e1000_i350) {
+		s64 ns = rd32(auxstmpl);
+
+		ns += ((s64)(rd32(auxstmph) & 0xFF)) << 32;
+		ts = ns_to_timespec64(ns);
+	} else {
+		ts.tv_nsec = rd32(auxstmpl);
+		ts.tv_sec  = rd32(auxstmph);
+	}
+
+	event.type = PTP_CLOCK_EXTTS;
+	event.index = tsintr_tt;
+	event.timestamp = ts.tv_sec * 1000000000ULL + ts.tv_nsec;
+	ptp_clock_event(adapter->ptp_clock, &event);
+}
+
+static void igb_tsync_interrupt(struct igb_adapter *adapter)
+{
+	struct e1000_hw *hw = &adapter->hw;
+	u32 ack = 0, tsicr = rd32(E1000_TSICR);
+	struct ptp_clock_event event;
 
 	if (tsicr & TSINTR_SYS_WRAP) {
 		event.type = PTP_CLOCK_PPS;
@@ -6760,51 +6867,22 @@ static void igb_tsync_interrupt(struct igb_adapter *adapter)
 	}
 
 	if (tsicr & TSINTR_TT0) {
-		spin_lock(&adapter->tmreg_lock);
-		ts = timespec64_add(adapter->perout[0].start,
-				    adapter->perout[0].period);
-		/* u32 conversion of tv_sec is safe until y2106 */
-		wr32(E1000_TRGTTIML0, ts.tv_nsec);
-		wr32(E1000_TRGTTIMH0, (u32)ts.tv_sec);
-		tsauxc = rd32(E1000_TSAUXC);
-		tsauxc |= TSAUXC_EN_TT0;
-		wr32(E1000_TSAUXC, tsauxc);
-		adapter->perout[0].start = ts;
-		spin_unlock(&adapter->tmreg_lock);
+		igb_perout(adapter, 0);
 		ack |= TSINTR_TT0;
 	}
 
 	if (tsicr & TSINTR_TT1) {
-		spin_lock(&adapter->tmreg_lock);
-		ts = timespec64_add(adapter->perout[1].start,
-				    adapter->perout[1].period);
-		wr32(E1000_TRGTTIML1, ts.tv_nsec);
-		wr32(E1000_TRGTTIMH1, (u32)ts.tv_sec);
-		tsauxc = rd32(E1000_TSAUXC);
-		tsauxc |= TSAUXC_EN_TT1;
-		wr32(E1000_TSAUXC, tsauxc);
-		adapter->perout[1].start = ts;
-		spin_unlock(&adapter->tmreg_lock);
+		igb_perout(adapter, 1);
 		ack |= TSINTR_TT1;
 	}
 
 	if (tsicr & TSINTR_AUTT0) {
-		nsec = rd32(E1000_AUXSTMPL0);
-		sec  = rd32(E1000_AUXSTMPH0);
-		event.type = PTP_CLOCK_EXTTS;
-		event.index = 0;
-		event.timestamp = sec * 1000000000ULL + nsec;
-		ptp_clock_event(adapter->ptp_clock, &event);
+		igb_extts(adapter, 0);
 		ack |= TSINTR_AUTT0;
 	}
 
 	if (tsicr & TSINTR_AUTT1) {
-		nsec = rd32(E1000_AUXSTMPL1);
-		sec  = rd32(E1000_AUXSTMPH1);
-		event.type = PTP_CLOCK_EXTTS;
-		event.index = 1;
-		event.timestamp = sec * 1000000000ULL + nsec;
-		ptp_clock_event(adapter->ptp_clock, &event);
+		igb_extts(adapter, 1);
 		ack |= TSINTR_AUTT1;
 	}