net: mdio: mux-bcm-iproc: Separate C22 and C45 transactions

The MDIO mux broadcom iproc can perform both C22 and C45 transfers.
Create separate functions for each and register the C45 versions using
the new API calls.
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/mdio/mdio-mux-bcm-iproc.c

@@ -98,7 +98,7 @@ static int iproc_mdio_wait_for_idle(void __iomem *base, bool result)
  * Return value: Successful Read operation returns read reg values and write
  *      operation returns 0. Failure operation returns negative error code.
  */
-static int start_miim_ops(void __iomem *base,
+static int start_miim_ops(void __iomem *base, bool c45,
 			  u16 phyid, u32 reg, u16 val, u32 op)
 {
 	u32 param;
@@ -112,7 +112,7 @@ static int start_miim_ops(void __iomem *base,
 	param = readl(base + MDIO_PARAM_OFFSET);
 	param |= phyid << MDIO_PARAM_PHY_ID;
 	param |= val << MDIO_PARAM_PHY_DATA;
-	if (reg & MII_ADDR_C45)
+	if (c45)
 		param |= BIT(MDIO_PARAM_C45_SEL);
 
 	writel(param, base + MDIO_PARAM_OFFSET);
@@ -131,28 +131,58 @@ static int start_miim_ops(void __iomem *base,
 	return ret;
 }
 
-static int iproc_mdiomux_read(struct mii_bus *bus, int phyid, int reg)
+static int iproc_mdiomux_read_c22(struct mii_bus *bus, int phyid, int reg)
 {
 	struct iproc_mdiomux_desc *md = bus->priv;
 	int ret;
 
-	ret = start_miim_ops(md->base, phyid, reg, 0, MDIO_CTRL_READ_OP);
+	ret = start_miim_ops(md->base, false, phyid, reg, 0, MDIO_CTRL_READ_OP);
 	if (ret < 0)
-		dev_err(&bus->dev, "mdiomux read operation failed!!!");
+		dev_err(&bus->dev, "mdiomux c22 read operation failed!!!");
 
 	return ret;
 }
 
-static int iproc_mdiomux_write(struct mii_bus *bus,
-			       int phyid, int reg, u16 val)
+static int iproc_mdiomux_read_c45(struct mii_bus *bus, int phyid, int devad,
+				  int reg)
+{
+	struct iproc_mdiomux_desc *md = bus->priv;
+	int ret;
+
+	ret = start_miim_ops(md->base, true, phyid, reg | devad << 16, 0,
+			     MDIO_CTRL_READ_OP);
+	if (ret < 0)
+		dev_err(&bus->dev, "mdiomux read c45 operation failed!!!");
+
+	return ret;
+}
+
+static int iproc_mdiomux_write_c22(struct mii_bus *bus,
+				   int phyid, int reg, u16 val)
+{
+	struct iproc_mdiomux_desc *md = bus->priv;
+	int ret;
+
+	/* Write val at reg offset */
+	ret = start_miim_ops(md->base, false, phyid, reg, val,
+			     MDIO_CTRL_WRITE_OP);
+	if (ret < 0)
+		dev_err(&bus->dev, "mdiomux write c22 operation failed!!!");
+
+	return ret;
+}
+
+static int iproc_mdiomux_write_c45(struct mii_bus *bus,
+				   int phyid, int devad, int reg, u16 val)
 {
 	struct iproc_mdiomux_desc *md = bus->priv;
 	int ret;
 
 	/* Write val at reg offset */
-	ret = start_miim_ops(md->base, phyid, reg, val, MDIO_CTRL_WRITE_OP);
+	ret = start_miim_ops(md->base, true, phyid, reg | devad << 16, val,
+			     MDIO_CTRL_WRITE_OP);
 	if (ret < 0)
-		dev_err(&bus->dev, "mdiomux write operation failed!!!");
+		dev_err(&bus->dev, "mdiomux write c45 operation failed!!!");
 
 	return ret;
 }
@@ -223,8 +253,10 @@ static int mdio_mux_iproc_probe(struct platform_device *pdev)
 	bus->name = "iProc MDIO mux bus";
 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id);
 	bus->parent = &pdev->dev;
-	bus->read = iproc_mdiomux_read;
-	bus->write = iproc_mdiomux_write;
+	bus->read = iproc_mdiomux_read_c22;
+	bus->write = iproc_mdiomux_write_c22;
+	bus->read_c45 = iproc_mdiomux_read_c45;
+	bus->write_c45 = iproc_mdiomux_write_c45;
 
 	bus->phy_mask = ~0;
 	bus->dev.of_node = pdev->dev.of_node;