net: mdio: cavium: Separate C22 and C45 transactions

The cavium IP can perform both C22 and C45 transfers.  Create separate
functions for each and register the C45 versions in both the octeon
and thunder bus driver.
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-cavium.c

@@ -26,7 +26,7 @@ static void cavium_mdiobus_set_mode(struct cavium_mdiobus *p,
 }
 
 static int cavium_mdiobus_c45_addr(struct cavium_mdiobus *p,
-				   int phy_id, int regnum)
+				   int phy_id, int devad, int regnum)
 {
 	union cvmx_smix_cmd smi_cmd;
 	union cvmx_smix_wr_dat smi_wr;
@@ -38,12 +38,10 @@ static int cavium_mdiobus_c45_addr(struct cavium_mdiobus *p,
 	smi_wr.s.dat = regnum & 0xffff;
 	oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);
 
-	regnum = (regnum >> 16) & 0x1f;
-
 	smi_cmd.u64 = 0;
 	smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_45_ADDRESS */
 	smi_cmd.s.phy_adr = phy_id;
-	smi_cmd.s.reg_adr = regnum;
+	smi_cmd.s.reg_adr = devad;
 	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
 
 	do {
@@ -59,28 +57,51 @@ static int cavium_mdiobus_c45_addr(struct cavium_mdiobus *p,
 	return 0;
 }
 
-int cavium_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
+int cavium_mdiobus_read_c22(struct mii_bus *bus, int phy_id, int regnum)
 {
 	struct cavium_mdiobus *p = bus->priv;
 	union cvmx_smix_cmd smi_cmd;
 	union cvmx_smix_rd_dat smi_rd;
-	unsigned int op = 1; /* MDIO_CLAUSE_22_READ */
 	int timeout = 1000;
 
-	if (regnum & MII_ADDR_C45) {
-		int r = cavium_mdiobus_c45_addr(p, phy_id, regnum);
+	cavium_mdiobus_set_mode(p, C22);
+
+	smi_cmd.u64 = 0;
+	smi_cmd.s.phy_op = 1; /* MDIO_CLAUSE_22_READ */;
+	smi_cmd.s.phy_adr = phy_id;
+	smi_cmd.s.reg_adr = regnum;
+	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
+
+	do {
+		/* Wait 1000 clocks so we don't saturate the RSL bus
+		 * doing reads.
+		 */
+		__delay(1000);
+		smi_rd.u64 = oct_mdio_readq(p->register_base + SMI_RD_DAT);
+	} while (smi_rd.s.pending && --timeout);
+
+	if (smi_rd.s.val)
+		return smi_rd.s.dat;
+	else
+		return -EIO;
+}
+EXPORT_SYMBOL(cavium_mdiobus_read_c22);
 
-		if (r < 0)
-			return r;
+int cavium_mdiobus_read_c45(struct mii_bus *bus, int phy_id, int devad,
+			    int regnum)
+{
+	struct cavium_mdiobus *p = bus->priv;
+	union cvmx_smix_cmd smi_cmd;
+	union cvmx_smix_rd_dat smi_rd;
+	int timeout = 1000;
+	int r;
 
-		regnum = (regnum >> 16) & 0x1f;
-		op = 3; /* MDIO_CLAUSE_45_READ */
-	} else {
-		cavium_mdiobus_set_mode(p, C22);
-	}
+	r = cavium_mdiobus_c45_addr(p, phy_id, devad, regnum);
+	if (r < 0)
+		return r;
 
 	smi_cmd.u64 = 0;
-	smi_cmd.s.phy_op = op;
+	smi_cmd.s.phy_op = 3; /* MDIO_CLAUSE_45_READ */
 	smi_cmd.s.phy_adr = phy_id;
 	smi_cmd.s.reg_adr = regnum;
 	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
@@ -98,36 +119,64 @@ int cavium_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
 	else
 		return -EIO;
 }
-EXPORT_SYMBOL(cavium_mdiobus_read);
+EXPORT_SYMBOL(cavium_mdiobus_read_c45);
 
-int cavium_mdiobus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
+int cavium_mdiobus_write_c22(struct mii_bus *bus, int phy_id, int regnum,
+			     u16 val)
 {
 	struct cavium_mdiobus *p = bus->priv;
 	union cvmx_smix_cmd smi_cmd;
 	union cvmx_smix_wr_dat smi_wr;
-	unsigned int op = 0; /* MDIO_CLAUSE_22_WRITE */
 	int timeout = 1000;
 
-	if (regnum & MII_ADDR_C45) {
-		int r = cavium_mdiobus_c45_addr(p, phy_id, regnum);
+	cavium_mdiobus_set_mode(p, C22);
 
-		if (r < 0)
-			return r;
+	smi_wr.u64 = 0;
+	smi_wr.s.dat = val;
+	oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);
 
-		regnum = (regnum >> 16) & 0x1f;
-		op = 1; /* MDIO_CLAUSE_45_WRITE */
-	} else {
-		cavium_mdiobus_set_mode(p, C22);
-	}
+	smi_cmd.u64 = 0;
+	smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_22_WRITE */;
+	smi_cmd.s.phy_adr = phy_id;
+	smi_cmd.s.reg_adr = regnum;
+	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
+
+	do {
+		/* Wait 1000 clocks so we don't saturate the RSL bus
+		 * doing reads.
+		 */
+		__delay(1000);
+		smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT);
+	} while (smi_wr.s.pending && --timeout);
+
+	if (timeout <= 0)
+		return -EIO;
+
+	return 0;
+}
+EXPORT_SYMBOL(cavium_mdiobus_write_c22);
+
+int cavium_mdiobus_write_c45(struct mii_bus *bus, int phy_id, int devad,
+			     int regnum, u16 val)
+{
+	struct cavium_mdiobus *p = bus->priv;
+	union cvmx_smix_cmd smi_cmd;
+	union cvmx_smix_wr_dat smi_wr;
+	int timeout = 1000;
+	int r;
+
+	r = cavium_mdiobus_c45_addr(p, phy_id, devad, regnum);
+	if (r < 0)
+		return r;
 
 	smi_wr.u64 = 0;
 	smi_wr.s.dat = val;
 	oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);
 
 	smi_cmd.u64 = 0;
-	smi_cmd.s.phy_op = op;
+	smi_cmd.s.phy_op = 1; /* MDIO_CLAUSE_45_WRITE */
 	smi_cmd.s.phy_adr = phy_id;
-	smi_cmd.s.reg_adr = regnum;
+	smi_cmd.s.reg_adr = devad;
 	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
 
 	do {
@@ -143,7 +192,7 @@ int cavium_mdiobus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
 
 	return 0;
 }
-EXPORT_SYMBOL(cavium_mdiobus_write);
+EXPORT_SYMBOL(cavium_mdiobus_write_c45);
 
 MODULE_DESCRIPTION("Common code for OCTEON and Thunder MDIO bus drivers");
 MODULE_AUTHOR("David Daney");

drivers/net/mdio/mdio-cavium.h

@@ -114,5 +114,10 @@ static inline u64 oct_mdio_readq(void __iomem *addr)
 #define oct_mdio_readq(addr)		readq(addr)
 #endif
 
-int cavium_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum);
-int cavium_mdiobus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val);
+int cavium_mdiobus_read_c22(struct mii_bus *bus, int phy_id, int regnum);
+int cavium_mdiobus_write_c22(struct mii_bus *bus, int phy_id, int regnum,
+			     u16 val);
+int cavium_mdiobus_read_c45(struct mii_bus *bus, int phy_id, int devad,
+			    int regnum);
+int cavium_mdiobus_write_c45(struct mii_bus *bus, int phy_id, int devad,
+			     int regnum, u16 val);

drivers/net/mdio/mdio-octeon.c

@@ -58,8 +58,10 @@ static int octeon_mdiobus_probe(struct platform_device *pdev)
 	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%px", bus->register_base);
 	bus->mii_bus->parent = &pdev->dev;
 
-	bus->mii_bus->read = cavium_mdiobus_read;
-	bus->mii_bus->write = cavium_mdiobus_write;
+	bus->mii_bus->read = cavium_mdiobus_read_c22;
+	bus->mii_bus->write = cavium_mdiobus_write_c22;
+	bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
+	bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;
 
 	platform_set_drvdata(pdev, bus);
 

drivers/net/mdio/mdio-thunder.c

@@ -93,8 +93,10 @@ static int thunder_mdiobus_pci_probe(struct pci_dev *pdev,
 		bus->mii_bus->name = KBUILD_MODNAME;
 		snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", r.start);
 		bus->mii_bus->parent = &pdev->dev;
-		bus->mii_bus->read = cavium_mdiobus_read;
-		bus->mii_bus->write = cavium_mdiobus_write;
+		bus->mii_bus->read = cavium_mdiobus_read_c22;
+		bus->mii_bus->write = cavium_mdiobus_write_c22;
+		bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
+		bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;
 
 		err = of_mdiobus_register(bus->mii_bus, node);
 		if (err)