ixp4xx_eth: Implement the SIOCGHWTSTAMP ioctl

This is untested.

Signed-off-by: Ben Hutchings <[e-mail]>

drivers/net/ethernet/xscale/ixp4xx_eth.c

···
 	__raw_writel(TX_SNAPSHOT_LOCKED, &regs->channel[ch].ch_event);
 }
 
-static int hwtstamp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+static int hwtstamp_set(struct net_device *netdev, struct ifreq *ifr)
 {
 	struct hwtstamp_config cfg;
 	struct ixp46x_ts_regs *regs;
···
 	/* Clear out any old time stamps. */
 	__raw_writel(TX_SNAPSHOT_LOCKED | RX_SNAPSHOT_LOCKED,
 		     &regs->channel[ch].ch_event);
+
+	return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
+}
+
+static int hwtstamp_get(struct net_device *netdev, struct ifreq *ifr)
+{
+	struct hwtstamp_config cfg;
+	struct port *port = netdev_priv(netdev);
+
+	cfg.flags = 0;
+	cfg.tx_type = port->hwts_tx_en ? HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF;
+
+	switch (port->hwts_rx_en) {
+	case 0:
+		cfg.rx_filter = HWTSTAMP_FILTER_NONE;
+		break;
+	case PTP_SLAVE_MODE:
+		cfg.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_SYNC;
+		break;
+	case PTP_MASTER_MODE:
+		cfg.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ;
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		return -ERANGE;
+	}
 
 	return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
 }
···
 	if (!netif_running(dev))
 		return -EINVAL;
 
-	if (cpu_is_ixp46x() && cmd == SIOCSHWTSTAMP)
-		return hwtstamp_ioctl(dev, req, cmd);
+	if (cpu_is_ixp46x()) {
+		if (cmd == SIOCSHWTSTAMP)
+			return hwtstamp_set(dev, req);
+		if (cmd == SIOCGHWTSTAMP)
+			return hwtstamp_get(dev, req);
+	}
 
 	return phy_mii_ioctl(port->phydev, req, cmd);
 }