net: mdio: aspeed: Add c45 support

Add Clause 45 support for Aspeed mdio driver.
Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mdio/mdio-aspeed.c

@@ -21,6 +21,10 @@
 #define   ASPEED_MDIO_CTRL_OP		GENMASK(27, 26)
 #define     MDIO_C22_OP_WRITE		0b01
 #define     MDIO_C22_OP_READ		0b10
+#define     MDIO_C45_OP_ADDR		0b00
+#define     MDIO_C45_OP_WRITE		0b01
+#define     MDIO_C45_OP_PREAD		0b10
+#define     MDIO_C45_OP_READ		0b11
 #define   ASPEED_MDIO_CTRL_PHYAD	GENMASK(25, 21)
 #define   ASPEED_MDIO_CTRL_REGAD	GENMASK(20, 16)
 #define   ASPEED_MDIO_CTRL_MIIWDATA	GENMASK(15, 0)
@@ -66,8 +70,8 @@ static int aspeed_mdio_op(struct mii_bus *bus, u8 st, u8 op, u8 phyad, u8 regad,
 static int aspeed_mdio_get_data(struct mii_bus *bus)
 {
 	struct aspeed_mdio *ctx = bus->priv;
-	int rc;
 	u32 data;
+	int rc;
 
 	rc = readl_poll_timeout(ctx->base + ASPEED_MDIO_DATA, data,
 				data & ASPEED_MDIO_DATA_IDLE,
@@ -100,15 +104,37 @@ static int aspeed_mdio_write_c22(struct mii_bus *bus, int addr, int regnum,
 
 static int aspeed_mdio_read_c45(struct mii_bus *bus, int addr, int regnum)
 {
-	/* TODO: add c45 support */
-	return -EOPNOTSUPP;
+	u8 c45_dev = (regnum >> 16) & 0x1F;
+	u16 c45_addr = regnum & 0xFFFF;
+	int rc;
+
+	rc = aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C45, MDIO_C45_OP_ADDR,
+			    addr, c45_dev, c45_addr);
+	if (rc < 0)
+		return rc;
+
+	rc = aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C45, MDIO_C45_OP_READ,
+			    addr, c45_dev, 0);
+	if (rc < 0)
+		return rc;
+
+	return aspeed_mdio_get_data(bus);
 }
 
 static int aspeed_mdio_write_c45(struct mii_bus *bus, int addr, int regnum,
 				 u16 val)
 {
-	/* TODO: add c45 support */
-	return -EOPNOTSUPP;
+	u8 c45_dev = (regnum >> 16) & 0x1F;
+	u16 c45_addr = regnum & 0xFFFF;
+	int rc;
+
+	rc = aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C45, MDIO_C45_OP_ADDR,
+			    addr, c45_dev, c45_addr);
+	if (rc < 0)
+		return rc;
+
+	return aspeed_mdio_op(bus, ASPEED_MDIO_CTRL_ST_C45, MDIO_C45_OP_WRITE,
+			      addr, c45_dev, val);
 }
 
 static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum)
@@ -153,6 +179,7 @@ static int aspeed_mdio_probe(struct platform_device *pdev)
 	bus->parent = &pdev->dev;
 	bus->read = aspeed_mdio_read;
 	bus->write = aspeed_mdio_write;
+	bus->probe_capabilities = MDIOBUS_C22_C45;
 
 	rc = of_mdiobus_register(bus, pdev->dev.of_node);
 	if (rc) {