net/ucc_geth: Add SGMII support for UCC GETH driver

-- derived from reverted commit 047584ce94108012288554a5f84585d792cc7f8f
-- reworked by Grant Likely to play nice with commit:
   "net: Rework ucc_geth driver to use of_mdio infrastructure"
   (0b9da337dca972e7a4144e298ec3adb8f244d4a4)

Signed-off-by: Haiying Wang <Haiying.Wang@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 84 insertions, 2 deletions

diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c
index 0cf22c4f123b..255d28d4f84e 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>
@@ -1410,6 +1410,9 @@ 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
@@ -1531,6 +1534,49 @@ static void adjust_link(struct net_device *dev)
         spin_unlock_irqrestore(&ugeth->lock, flags);
 }
 
+/* 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);
+        struct ucc_geth_info *ug_info = ugeth->ug_info;
+        struct phy_device *tbiphy;
+
+        if (!ug_info->tbi_node) {
+                dev_warn(&dev->dev, "SGMII mode requires that the device "
+                        "tree specify a tbi-handle\n");
+                return;
+        }
+
+        tbiphy = of_phy_find_device(ug_info->tbi_node);
+        if (!tbiphy) {
+                dev_err(&dev->dev, "error: Could not get TBI device\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(tbiphy, ENET_TBI_MII_SR) & TBISR_LSTATUS)
+                return;
+
+        /* Single clk mode, mii mode off(for serdes communication) */
+        phy_write(tbiphy, ENET_TBI_MII_ANA, TBIANA_SETTINGS);
+
+        phy_write(tbiphy, ENET_TBI_MII_TBICON, TBICON_CLK_SELECT);
+
+        phy_write(tbiphy, ENET_TBI_MII_CR, TBICR_SETTINGS);
+}
+
 /* Configure the PHY for dev.
  * returns 0 if success.  -1 if failure
  */
@@ -1554,6 +1600,9 @@ 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 |
@@ -3523,6 +3572,8 @@ 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 +3618,7 @@ 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__);
@@ -3658,6 +3710,9 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma
         }
         ug_info->phy_node = phy;
 
+        /* Find the TBI PHY node.  If it's not there, we don't support SGMII */
+        ug_info->tbi_node = of_parse_phandle(np, "tbi-handle", 0);
+
         /* get the phy interface type, or default to MII */
         prop = of_get_property(np, "phy-connection-type", NULL);
         if (!prop) {
@@ -3682,6 +3737,7 @@ 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:
diff --git a/drivers/net/ucc_geth.h b/drivers/net/ucc_geth.h
index dca628a922ba..1525bf51341c 100644
--- a/drivers/net/ucc_geth.h
+++ b/drivers/net/ucc_geth.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) Freescale Semicondutor, Inc. 2006. All rights reserved.
+ * Copyright (C) Freescale Semicondutor, Inc. 2006-2009. All rights reserved.
  *
  * Author: Shlomi Gridish <gridish@freescale.com>
  *
@@ -193,6 +193,31 @@ struct ucc_geth {
 #define ENET_TBI_MII_JD         0x10    /* Jitter diagnostics */
 #define ENET_TBI_MII_TBICON     0x11    /* TBI control */
 
+/* TBI MDIO register bit fields*/
+#define TBISR_LSTATUS          0x0004
+#define TBICON_CLK_SELECT       0x0020
+#define TBIANA_ASYMMETRIC_PAUSE 0x0100
+#define TBIANA_SYMMETRIC_PAUSE  0x0080
+#define TBIANA_HALF_DUPLEX      0x0040
+#define TBIANA_FULL_DUPLEX      0x0020
+#define TBICR_PHY_RESET         0x8000
+#define TBICR_ANEG_ENABLE       0x1000
+#define TBICR_RESTART_ANEG      0x0200
+#define TBICR_FULL_DUPLEX       0x0100
+#define TBICR_SPEED1_SET        0x0040
+
+#define TBIANA_SETTINGS ( \
+                TBIANA_ASYMMETRIC_PAUSE \
+                | TBIANA_SYMMETRIC_PAUSE \
+                | TBIANA_FULL_DUPLEX \
+                )
+#define TBICR_SETTINGS ( \
+                TBICR_PHY_RESET \
+                | TBICR_ANEG_ENABLE \
+                | TBICR_FULL_DUPLEX \
+                | TBICR_SPEED1_SET \
+                )
+
 /* UCC GETH MACCFG1 (MAC Configuration 1 Register) */
 #define MACCFG1_FLOW_RX                         0x00000020      /* Flow Control
                                                                    Rx */
@@ -1100,6 +1125,7 @@ struct ucc_geth_info {
         u16 pausePeriod;
         u16 extensionField;
         struct device_node *phy_node;
+        struct device_node *tbi_node;
         u8 weightfactor[NUM_TX_QUEUES];
         u8 interruptcoalescingmaxvalue[NUM_RX_QUEUES];
         u8 l2qt[UCC_GETH_VLAN_PRIORITY_MAX];