net/ucc_geth: Add SGMII support for UEC GETH driver

Signed-off-by: Haiying Wang <Haiying.Wang@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 78 insertions, 1 deletions

diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c
index 0cf22c4f123b..fd6140bd9aae 100644
--- a/drivers/net/ucc_geth.c
+++ b/drivers/net/ucc_geth.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006-2007 Freescale Semicondutor, Inc. All rights reserved.
+ * Copyright (C) 2006-2009 Freescale Semicondutor, Inc. All rights reserved.
  *
  * Author: Shlomi Gridish <gridish@freescale.com>
  *         Li Yang <leoli@freescale.com>
@@ -65,6 +65,8 @@
 
 static DEFINE_SPINLOCK(ugeth_lock);
 
+static void uec_configure_serdes(struct net_device *dev);
+
 static struct {
         u32 msg_enable;
 } debug = { -1 };
@@ -1410,6 +1412,9 @@ static int adjust_enet_interface(struct ucc_geth_private *ugeth)
             (ugeth->phy_interface == PHY_INTERFACE_MODE_RTBI)) {
                 upsmr |= UCC_GETH_UPSMR_TBIM;
         }
+        if ((ugeth->phy_interface == PHY_INTERFACE_MODE_SGMII))
+                upsmr |= UCC_GETH_UPSMR_SGMM;
+
         out_be32(&uf_regs->upsmr, upsmr);
 
         /* Disable autonegotiation in tbi mode, because by default it
@@ -1554,6 +1559,9 @@ static int init_phy(struct net_device *dev)
                 return -ENODEV;
         }
 
+        if (priv->phy_interface == PHY_INTERFACE_MODE_SGMII)
+                uec_configure_serdes(dev);
+
         phydev->supported &= (ADVERTISED_10baseT_Half |
                                  ADVERTISED_10baseT_Full |
                                  ADVERTISED_100baseT_Half |
@@ -1569,7 +1577,41 @@ static int init_phy(struct net_device *dev)
         return 0;
 }
 
+/* Initialize TBI PHY interface for communicating with the
+ * SERDES lynx PHY on the chip.  We communicate with this PHY
+ * through the MDIO bus on each controller, treating it as a
+ * "normal" PHY at the address found in the UTBIPA register.  We assume
+ * that the UTBIPA register is valid.  Either the MDIO bus code will set
+ * it to a value that doesn't conflict with other PHYs on the bus, or the
+ * value doesn't matter, as there are no other PHYs on the bus.
+ */
+static void uec_configure_serdes(struct net_device *dev)
+{
+        struct ucc_geth_private *ugeth = netdev_priv(dev);
+
+        if (!ugeth->tbiphy) {
+                printk(KERN_WARNING "SGMII mode requires that the device "
+                        "tree specify a tbi-handle\n");
+        return;
+        }
+
+        /*
+         * If the link is already up, we must already be ok, and don't need to
+         * configure and reset the TBI<->SerDes link.  Maybe U-Boot configured
+         * everything for us?  Resetting it takes the link down and requires
+         * several seconds for it to come back.
+         */
+        if (phy_read(ugeth->tbiphy, ENET_TBI_MII_SR) & TBISR_LSTATUS)
+                return;
+
+        /* Single clk mode, mii mode off(for serdes communication) */
+        phy_write(ugeth->tbiphy, ENET_TBI_MII_ANA, TBIANA_SETTINGS);
 
+        phy_write(ugeth->tbiphy, ENET_TBI_MII_TBICON, TBICON_CLK_SELECT);
+
+        phy_write(ugeth->tbiphy, ENET_TBI_MII_CR, TBICR_SETTINGS);
+
+}
 
 static int ugeth_graceful_stop_tx(struct ucc_geth_private *ugeth)
 {
@@ -3523,6 +3565,8 @@ static phy_interface_t to_phy_interface(const char *phy_connection_type)
                 return PHY_INTERFACE_MODE_RGMII_RXID;
         if (strcasecmp(phy_connection_type, "rtbi") == 0)
                 return PHY_INTERFACE_MODE_RTBI;
+        if (strcasecmp(phy_connection_type, "sgmii") == 0)
+                return PHY_INTERFACE_MODE_SGMII;
 
         return PHY_INTERFACE_MODE_MII;
 }
@@ -3567,6 +3611,7 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma
                 PHY_INTERFACE_MODE_RMII, PHY_INTERFACE_MODE_RGMII,
                 PHY_INTERFACE_MODE_GMII, PHY_INTERFACE_MODE_RGMII,
                 PHY_INTERFACE_MODE_TBI, PHY_INTERFACE_MODE_RTBI,
+                PHY_INTERFACE_MODE_SGMII,
         };
 
         ugeth_vdbg("%s: IN", __func__);
@@ -3682,6 +3727,7 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma
                 case PHY_INTERFACE_MODE_RGMII_TXID:
                 case PHY_INTERFACE_MODE_TBI:
                 case PHY_INTERFACE_MODE_RTBI:
+                case PHY_INTERFACE_MODE_SGMII:
                         max_speed = SPEED_1000;
                         break;
                 default:
@@ -3756,6 +3802,37 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma
         ugeth->ndev = dev;
         ugeth->node = np;
 
+        /* Find the TBI PHY.  If it's not there, we don't support SGMII */
+        ph = of_get_property(np, "tbi-handle", NULL);
+        if (ph) {
+                struct device_node *tbi = of_find_node_by_phandle(*ph);
+                struct of_device *ofdev;
+                struct mii_bus *bus;
+                const unsigned int *id;
+
+                if (!tbi)
+                        return 0;
+
+                mdio = of_get_parent(tbi);
+                if (!mdio)
+                        return 0;
+
+                ofdev = of_find_device_by_node(mdio);
+
+                of_node_put(mdio);
+
+                id = of_get_property(tbi, "reg", NULL);
+                if (!id)
+                        return 0;
+                of_node_put(tbi);
+
+                bus = dev_get_drvdata(&ofdev->dev);
+                if (!bus)
+                        return 0;
+
+                ugeth->tbiphy = bus->phy_map[*id];
+        }
+
         return 0;
 }