fs_enet: Add MPC5125 FEC support and PHY interface selection

Add compatible string for MPC5125 FEC. The FEC on MPC5125 additionally
supports RMII PHY interface. Configure controller/PHY interface type
according to the optional phy-connection-type property in the ethernet
node. This property should be either "rmii" or "mii".

Signed-off-by: Vladimir Ermakov <vooon341@gmail.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fs_enet/fec.h

@@ -23,6 +23,10 @@
 #define FEC_ECNTRL_ETHER_EN	0x00000002
 #define FEC_ECNTRL_RESET	0x00000001
 
+/* RMII mode enabled only when MII_MODE bit is set too. */
+#define FEC_RCNTRL_RMII_MODE	(0x00000100 | \
+				 FEC_RCNTRL_MII_MODE | FEC_RCNTRL_FCE)
+#define FEC_RCNTRL_FCE		0x00000020
 #define FEC_RCNTRL_BC_REJ	0x00000010
 #define FEC_RCNTRL_PROM		0x00000008
 #define FEC_RCNTRL_MII_MODE	0x00000004
@@ -33,8 +37,6 @@
 #define FEC_TCNTRL_HBC		0x00000002
 #define FEC_TCNTRL_GTS		0x00000001
 
-
-
 /*
  * Delay to wait for FEC reset command to complete (in us)
  */

drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c

@@ -790,16 +790,20 @@ static int fs_init_phy(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
 	struct phy_device *phydev;
+	phy_interface_t iface;
 
 	fep->oldlink = 0;
 	fep->oldspeed = 0;
 	fep->oldduplex = -1;
 
+	iface = fep->fpi->use_rmii ?
+		PHY_INTERFACE_MODE_RMII : PHY_INTERFACE_MODE_MII;
+
 	phydev = of_phy_connect(dev, fep->fpi->phy_node, &fs_adjust_link, 0,
-				PHY_INTERFACE_MODE_MII);
+				iface);
 	if (!phydev) {
 		phydev = of_phy_connect_fixed_link(dev, &fs_adjust_link,
-						   PHY_INTERFACE_MODE_MII);
+						   iface);
 	}
 	if (!phydev) {
 		dev_err(&dev->dev, "Could not attach to PHY\n");
@@ -1007,6 +1011,7 @@ static int __devinit fs_enet_probe(struct platform_device *ofdev)
 	struct fs_platform_info *fpi;
 	const u32 *data;
 	const u8 *mac_addr;
+	const char *phy_connection_type;
 	int privsize, len, ret = -ENODEV;
 
 	match = of_match_device(fs_enet_match, &ofdev->dev);
@@ -1035,6 +1040,13 @@ static int __devinit fs_enet_probe(struct platform_device *ofdev)
 						  NULL)))
 		goto out_free_fpi;
 
+	if (of_device_is_compatible(ofdev->dev.of_node, "fsl,mpc5125-fec")) {
+		phy_connection_type = of_get_property(ofdev->dev.of_node,
+						"phy-connection-type", NULL);
+		if (phy_connection_type && !strcmp("rmii", phy_connection_type))
+			fpi->use_rmii = 1;
+	}
+
 	privsize = sizeof(*fep) +
 	           sizeof(struct sk_buff **) *
 	           (fpi->rx_ring + fpi->tx_ring);
@@ -1150,6 +1162,10 @@ static struct of_device_id fs_enet_match[] = {
 		.compatible = "fsl,mpc5121-fec",
 		.data = (void *)&fs_fec_ops,
 	},
+	{
+		.compatible = "fsl,mpc5125-fec",
+		.data = (void *)&fs_fec_ops,
+	},
 #else
 	{
 		.compatible = "fsl,pq1-fec-enet",

drivers/net/ethernet/freescale/fs_enet/mac-fec.c

@@ -322,10 +322,11 @@ static void restart(struct net_device *dev)
 	FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE);	/* MII enable */
 #else
 	/*
-	 * Only set MII mode - do not touch maximum frame length
+	 * Only set MII/RMII mode - do not touch maximum frame length
 	 * configured before.
 	 */
-	FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE);
+	FS(fecp, r_cntrl, fpi->use_rmii ?
+			FEC_RCNTRL_RMII_MODE : FEC_RCNTRL_MII_MODE);
 #endif
 	/*
 	 * adjust to duplex mode
@@ -381,7 +382,9 @@ static void stop(struct net_device *dev)
 
 	/* shut down FEC1? that's where the mii bus is */
 	if (fpi->has_phy) {
-		FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE);	/* MII enable */
+		FS(fecp, r_cntrl, fpi->use_rmii ?
+				FEC_RCNTRL_RMII_MODE :
+				FEC_RCNTRL_MII_MODE);	/* MII/RMII enable */
 		FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
 		FW(fecp, ievent, FEC_ENET_MII);
 		FW(fecp, mii_speed, feci->mii_speed);