Re: [PATCH V8 12/13] ptp: Added a clock driver for the IXP46x.

+struct ixp46x_channel_ctl {
+	u32 Ch_Control; /* 0x40 Time Synchronization Channel Control */
+	u32 Ch_Event;   /* 0x44 Time Synchronization Channel Event */
+	u32 TxSnapLo;   /* 0x48 Transmit Snapshot Low Register */
+	u32 TxSnapHi;   /* 0x4C Transmit Snapshot High Register */
+	u32 RxSnapLo;   /* 0x50 Receive Snapshot Low Register */
+	u32 RxSnapHi;   /* 0x54 Receive Snapshot High Register */
+	u32 SrcUUIDLo;  /* 0x58 Source UUID0 Low Register */
+	u32 SrcUUIDHi;  /* 0x5C Sequence Identifier/Source UUID0 High */

+static void do_tx_timestamp(struct port *port, struct sk_buff *skb)
+{
+#ifdef __ARMEB__
+	struct skb_shared_hwtstamps shhwtstamps;
+	struct ixp46x_ts_regs *regs;
+	struct skb_shared_info *shtx;
+	u64 ns;
+	u32 ch, cnt, hi, lo, val;
+
+	shtx = skb_shinfo(skb);
+	if (unlikely(shtx->tx_flags & SKBTX_HW_TSTAMP && port->hwts_tx_en))
+		shtx->tx_flags |= SKBTX_IN_PROGRESS;
+	else
+		return;
+
+	ch = PORT2CHANNEL(port);
+
+	regs = (struct ixp46x_ts_regs __iomem *) IXP4XX_TIMESYNC_BASE_VIRT;
+
+	/*
+	 * This really stinks, but we have to poll for the Tx time stamp.
+	 * Usually, the time stamp is ready after 4 to 6 microseconds.
+	 */
+	for (cnt = 0; cnt < 100; cnt++) {
+		val = __raw_readl(&regs->channel[ch].Ch_Event);
+		if (val & TX_SNAPSHOT_LOCKED)
+			break;
+		udelay(1);
+	}
+	if (!(val & TX_SNAPSHOT_LOCKED)) {
+		shtx->tx_flags &= ~SKBTX_IN_PROGRESS;
+		return;
+	}
+
+	lo = __raw_readl(&regs->channel[ch].TxSnapLo);
+	hi = __raw_readl(&regs->channel[ch].TxSnapHi);
+	ns = ((u64) hi) << 32;
+	ns |= lo;
+	ns <<= TICKS_NS_SHIFT;
+
+	memset(&shhwtstamps, 0, sizeof(shhwtstamps));
+	shhwtstamps.hwtstamp = ns_to_ktime(ns);
+	skb_tstamp_tx(skb, &shhwtstamps);
+
+	__raw_writel(TX_SNAPSHOT_LOCKED, &regs->channel[ch].Ch_Event);
+#endif
+}

@@ -1171,6 +1357,11 @@ static int __devinit eth_init_one(struct platform_device *pdev)
 	char phy_id[MII_BUS_ID_SIZE + 3];
 	int err;
 
+	if (ptp_filter_init(ptp_filter, ARRAY_SIZE(ptp_filter))) {
+		pr_err("ixp4xx_eth: bad ptp filter\n");
+		return -EINVAL;
+	}
+
 	if (!(dev = alloc_etherdev(sizeof(struct port))))
 		return -ENOMEM;