phy/marvell: add 88e1121 interface mode support

This patch adds support for RGMII RX/TX delay configuration on marvell 88e1121
and derivatives.  With this patch, PHY_INTERFACE_MODE_RGMII_*ID modes are now
supported on these devices.

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 32 insertions, 3 deletions

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index 78b74e83ce5d..b1413aed3f98 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -69,6 +69,12 @@
 #define MII_M1111_COPPER                0
 #define MII_M1111_FIBER                 1
 
+#define MII_88E1121_PHY_MSCR_PAGE       2
+#define MII_88E1121_PHY_MSCR_REG        21
+#define MII_88E1121_PHY_MSCR_RX_DELAY   BIT(5)
+#define MII_88E1121_PHY_MSCR_TX_DELAY   BIT(4)
+#define MII_88E1121_PHY_MSCR_DELAY_MASK (~(0x3 << 4))
+
 #define MII_88E1121_PHY_LED_CTRL        16
 #define MII_88E1121_PHY_LED_PAGE        3
 #define MII_88E1121_PHY_LED_DEF         0x0030
@@ -180,7 +186,30 @@ static int marvell_config_aneg(struct phy_device *phydev)
 
 static int m88e1121_config_aneg(struct phy_device *phydev)
 {
-        int err, temp;
+        int err, oldpage, mscr;
+
+        oldpage = phy_read(phydev, MII_88E1121_PHY_PAGE);
+
+        err = phy_write(phydev, MII_88E1121_PHY_PAGE,
+                        MII_88E1121_PHY_MSCR_PAGE);
+        if (err < 0)
+                return err;
+        mscr = phy_read(phydev, MII_88E1121_PHY_MSCR_REG) &
+                MII_88E1121_PHY_MSCR_DELAY_MASK;
+
+        if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
+                mscr |= (MII_88E1121_PHY_MSCR_RX_DELAY |
+                         MII_88E1121_PHY_MSCR_TX_DELAY);
+        else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
+                mscr |= MII_88E1121_PHY_MSCR_RX_DELAY;
+        else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
+                mscr |= MII_88E1121_PHY_MSCR_TX_DELAY;
+
+        err = phy_write(phydev, MII_88E1121_PHY_MSCR_REG, mscr);
+        if (err < 0)
+                return err;
+
+        phy_write(phydev, MII_88E1121_PHY_PAGE, oldpage);
 
         err = phy_write(phydev, MII_BMCR, BMCR_RESET);
         if (err < 0)
@@ -191,11 +220,11 @@ static int m88e1121_config_aneg(struct phy_device *phydev)
         if (err < 0)
                 return err;
 
-        temp = phy_read(phydev, MII_88E1121_PHY_PAGE);
+        oldpage = phy_read(phydev, MII_88E1121_PHY_PAGE);
 
         phy_write(phydev, MII_88E1121_PHY_PAGE, MII_88E1121_PHY_LED_PAGE);
         phy_write(phydev, MII_88E1121_PHY_LED_CTRL, MII_88E1121_PHY_LED_DEF);
-        phy_write(phydev, MII_88E1121_PHY_PAGE, temp);
+        phy_write(phydev, MII_88E1121_PHY_PAGE, oldpage);
 
         err = genphy_config_aneg(phydev);