net: nixge: Separate C22 and C45 transactions

The nixge MDIO bus driver can perform both C22 and C45 transfers.
Create separate functions for each and register the C45 versions using
the new API calls where appropriate.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/ni/nixge.c

@@ -1081,20 +1081,45 @@ static const struct ethtool_ops nixge_ethtool_ops = {
 	.get_link		= ethtool_op_get_link,
 };
 
-static int nixge_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+static int nixge_mdio_read_c22(struct mii_bus *bus, int phy_id, int reg)
 {
 	struct nixge_priv *priv = bus->priv;
 	u32 status, tmp;
 	int err;
 	u16 device;
 
-	if (reg & MII_ADDR_C45) {
-		device = (reg >> 16) & 0x1f;
+	device = reg & 0x1f;
+
+	tmp = NIXGE_MDIO_CLAUSE22 | NIXGE_MDIO_OP(NIXGE_MDIO_C22_READ) |
+	      NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
+
+	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
+	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
+
+	err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
+				      !status, 10, 1000);
+	if (err) {
+		dev_err(priv->dev, "timeout setting read command");
+		return err;
+	}
+
+	status = nixge_ctrl_read_reg(priv, NIXGE_REG_MDIO_DATA);
+
+	return status;
+}
+
+static int nixge_mdio_read_c45(struct mii_bus *bus, int phy_id, int device,
+			       int reg)
+{
+	struct nixge_priv *priv = bus->priv;
+	u32 status, tmp;
+	int err;
 
 	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_ADDR, reg & 0xffff);
 
-		tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS)
-			| NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
+	tmp = NIXGE_MDIO_CLAUSE45 |
+	      NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS) |
+	      NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
 
 	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
 	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
@@ -1108,12 +1133,6 @@ static int nixge_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 
 	tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_C45_READ) |
 	      NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
-	} else {
-		device = reg & 0x1f;
-
-		tmp = NIXGE_MDIO_CLAUSE22 | NIXGE_MDIO_OP(NIXGE_MDIO_C22_READ) |
-			NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
-	}
 
 	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
 	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
@@ -1130,56 +1149,64 @@ static int nixge_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 	return status;
 }
 
-static int nixge_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
+static int nixge_mdio_write_c22(struct mii_bus *bus, int phy_id, int reg,
+				u16 val)
 {
 	struct nixge_priv *priv = bus->priv;
 	u32 status, tmp;
 	u16 device;
 	int err;
 
-	if (reg & MII_ADDR_C45) {
-		device = (reg >> 16) & 0x1f;
-
-		nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_ADDR, reg & 0xffff);
+	device = reg & 0x1f;
 
-		tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS)
-			| NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
+	tmp = NIXGE_MDIO_CLAUSE22 | NIXGE_MDIO_OP(NIXGE_MDIO_C22_WRITE) |
+	      NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
 
+	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_DATA, val);
 	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
 	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
 
 	err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
 				      !status, 10, 1000);
-		if (err) {
-			dev_err(priv->dev, "timeout setting address");
+	if (err)
+		dev_err(priv->dev, "timeout setting write command");
+
 	return err;
-		}
+}
 
-		tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_C45_WRITE)
-			| NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
+static int nixge_mdio_write_c45(struct mii_bus *bus, int phy_id,
+				int device, int reg, u16 val)
+{
+	struct nixge_priv *priv = bus->priv;
+	u32 status, tmp;
+	int err;
+
+	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_ADDR, reg & 0xffff);
+
+	tmp = NIXGE_MDIO_CLAUSE45 |
+	      NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS) |
+	      NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
 
-		nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_DATA, val);
 	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
+	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
+
 	err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
 				      !status, 10, 1000);
-		if (err)
-			dev_err(priv->dev, "timeout setting write command");
-	} else {
-		device = reg & 0x1f;
+	if (err) {
+		dev_err(priv->dev, "timeout setting address");
+		return err;
+	}
 
-		tmp = NIXGE_MDIO_CLAUSE22 |
-			NIXGE_MDIO_OP(NIXGE_MDIO_C22_WRITE) |
+	tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_C45_WRITE) |
 	      NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
 
 	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_DATA, val);
 	nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
-		nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
 
 	err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
 				      !status, 10, 1000);
 	if (err)
 		dev_err(priv->dev, "timeout setting write command");
-	}
 
 	return err;
 }
@@ -1195,8 +1222,10 @@ static int nixge_mdio_setup(struct nixge_priv *priv, struct device_node *np)
 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(priv->dev));
 	bus->priv = priv;
 	bus->name = "nixge_mii_bus";
-	bus->read = nixge_mdio_read;
-	bus->write = nixge_mdio_write;
+	bus->read = nixge_mdio_read_c22;
+	bus->write = nixge_mdio_write_c22;
+	bus->read_c45 = nixge_mdio_read_c45;
+	bus->write_c45 = nixge_mdio_write_c45;
 	bus->parent = priv->dev;
 
 	priv->mii_bus = bus;