net: phy: cavium: Improve __iomem mess

The MIPS low level register access functions seem to be missing
__iomem annotation. This causes lots of sparse warnings, when code
casts off the __iomem. Make the Cavium MDIO drivers cleaner by pushing
the casts lower down into the helpers, allow the drivers to work as
normal, with __iomem.

bus->register_base is now an void *, rather than a u64. So forming the
mii_bus->id string cannot use %llx any more. Use %px, so this kernel
address is still exposed to user space, as it was before.

v2: s/cases/causes/g

Cc: Sunil Goutham <sgoutham@marvell.com>
Cc: Robert Richter <rrichter@marvell.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mdio-cavium.h

@@ -90,7 +90,7 @@ union cvmx_smix_wr_dat {
 
 struct cavium_mdiobus {
 	struct mii_bus *mii_bus;
-	u64 register_base;
+	void __iomem *register_base;
 	enum cavium_mdiobus_mode mode;
 };
 
@@ -98,20 +98,20 @@ struct cavium_mdiobus {
 
 #include <asm/octeon/octeon.h>
 
-static inline void oct_mdio_writeq(u64 val, u64 addr)
+static inline void oct_mdio_writeq(u64 val, void __iomem *addr)
 {
-	cvmx_write_csr(addr, val);
+	cvmx_write_csr((u64 __force)addr, val);
 }
 
-static inline u64 oct_mdio_readq(u64 addr)
+static inline u64 oct_mdio_readq(void __iomem *addr)
 {
-	return cvmx_read_csr(addr);
+	return cvmx_read_csr((u64 __force)addr);
 }
 #else
 #include <linux/io-64-nonatomic-lo-hi.h>
 
-#define oct_mdio_writeq(val, addr)	writeq(val, (void *)addr)
-#define oct_mdio_readq(addr)		readq((void *)addr)
+#define oct_mdio_writeq(val, addr)	writeq(val, addr)
+#define oct_mdio_readq(addr)		readq(addr)
 #endif
 
 int cavium_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum);

drivers/net/phy/mdio-octeon.c

@@ -44,8 +44,7 @@ static int octeon_mdiobus_probe(struct platform_device *pdev)
 		return -ENXIO;
 	}
 
-	bus->register_base =
-		(u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
+	bus->register_base = devm_ioremap(&pdev->dev, mdio_phys, regsize);
 	if (!bus->register_base) {
 		dev_err(&pdev->dev, "dev_ioremap failed\n");
 		return -ENOMEM;
@@ -56,7 +55,7 @@ static int octeon_mdiobus_probe(struct platform_device *pdev)
 	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 
 	bus->mii_bus->name = KBUILD_MODNAME;
-	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
+	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;

drivers/net/phy/mdio-thunder.c

@@ -84,7 +84,7 @@ static int thunder_mdiobus_pci_probe(struct pci_dev *pdev,
 		nexus->buses[i] = bus;
 		i++;
 
-		bus->register_base = (u64)nexus->bar0 +
+		bus->register_base = nexus->bar0 +
 			r.start - pci_resource_start(pdev, 0);
 
 		smi_en.u64 = 0;