Merge branch 'thunderx-phy'

David Daney says:

====================
net/phy: Improvements to Cavium Thunder MDIO code.

Changes from v1:

 - In 1/3 Add back check for non-OF objects in bgx_init_of_phy().  It
   is probably not necessary, but better safe than sorry...

The firmware on many Cavium Thunder systems configures the MDIO bus
hardware to be probed as a PCI device.  In order to use the MDIO bus
drivers in this configuration, we must add PCI probing to the driver.

There are two parts to this set of three patches:

 1) Cleanup the PHY probing code in thunder_bgx.c to handle the case
    where there is no PHY attached to a port, as well as being more
    robust in the face of driver loading order by use of
    -EPROBE_DEFER.

 2) Split mdio-octeon.c into two drivers, one with platform probing,
 and the other with PCI probing.  Common code is shared between the
 two.

Tested on several different Thunder and OCTEON systems, also compile
tested on x86_64.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 535 insertions, 281 deletions

diff --git a/Documentation/devicetree/bindings/net/cavium-mdio.txt b/Documentation/devicetree/bindings/net/cavium-mdio.txt
index 04cb7491d232..020df08b8a30 100644
--- a/Documentation/devicetree/bindings/net/cavium-mdio.txt
+++ b/Documentation/devicetree/bindings/net/cavium-mdio.txt
@@ -1,9 +1,12 @@
 * System Management Interface (SMI) / MDIO
 
 Properties:
-- compatible: "cavium,octeon-3860-mdio"
+- compatible: One of:
 
-  Compatibility with all cn3XXX, cn5XXX and cn6XXX SOCs.
+   "cavium,octeon-3860-mdio": Compatibility with all cn3XXX, cn5XXX
+                       and cn6XXX SOCs.
+
+   "cavium,thunder-8890-mdio": Compatibility with all cn8XXX SOCs.
 
 - reg: The base address of the MDIO bus controller register bank.
 
@@ -25,3 +28,57 @@ Example:
 			reg = <0>;
 		};
 	};
+
+
+* System Management Interface (SMI) / MDIO Nexus
+
+  Several mdio buses may be gathered as children of a single PCI
+  device, this PCI device is the nexus of the buses.
+
+Properties:
+
+- compatible: "cavium,thunder-8890-mdio-nexus";
+
+- reg: The PCI device and function numbers of the nexus device.
+
+- #address-cells: Must be <2>.
+
+- #size-cells: Must be <2>.
+
+- ranges: As needed for mapping of the MDIO bus device registers.
+
+- assigned-addresses: As needed for mapping of the MDIO bus device registers.
+
+Example:
+
+        mdio-nexus@1,3 {
+                compatible = "cavium,thunder-8890-mdio-nexus";
+                #address-cells = <2>;
+                #size-cells = <2>;
+                reg = <0x0b00 0 0 0 0>; /* DEVFN = 0x0b (1:3) */
+                assigned-addresses = <0x03000000 0x87e0 0x05000000 0x0 0x800000>;
+                ranges = <0x87e0 0x05000000 0x03000000 0x87e0 0x05000000 0x0 0x800000>;
+
+                mdio0@87e0,05003800 {
+                        compatible = "cavium,thunder-8890-mdio";
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+                        reg = <0x87e0 0x05003800 0x0 0x30>;
+
+                        ethernet-phy@0 {
+                                ...
+                                reg = <0>;
+                        };
+                };
+                mdio0@87e0,05003880 {
+                        compatible = "cavium,thunder-8890-mdio";
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+                        reg = <0x87e0 0x05003880 0x0 0x30>;
+
+                        ethernet-phy@0 {
+                                ...
+                                reg = <0>;
+                        };
+                };
+        };
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
index f8abdffdd851..feed2318201b 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -978,27 +978,37 @@ static int bgx_init_of_phy(struct bgx *bgx)
 	const char *mac;
 
 	device_for_each_child_node(&bgx->pdev->dev, fwn) {
+		struct phy_device *pd;
 		struct device_node *phy_np;
 		struct device_node *node = to_of_node(fwn);
 
-		/* If it is not an OF node we cannot handle it yet, so
-		 * exit the loop.
+		/* Should always be an OF node.  But if it is not, we
+		 * cannot handle it, so exit the loop.
 		 */
 		if (!node)
 			break;
 
-		phy_np = of_parse_phandle(node, "phy-handle", 0);
-		if (!phy_np)
-			continue;
-
-		bgx->lmac[lmac].phydev = of_phy_find_device(phy_np);
-
 		mac = of_get_mac_address(node);
 		if (mac)
 			ether_addr_copy(bgx->lmac[lmac].mac, mac);
 
 		SET_NETDEV_DEV(&bgx->lmac[lmac].netdev, &bgx->pdev->dev);
 		bgx->lmac[lmac].lmacid = lmac;
+
+		phy_np = of_parse_phandle(node, "phy-handle", 0);
+		/* If there is no phy or defective firmware presents
+		 * this cortina phy, for which there is no driver
+		 * support, ignore it.
+		 */
+		if (phy_np &&
+		    !of_device_is_compatible(phy_np, "cortina,cs4223-slice")) {
+			/* Wait until the phy drivers are available */
+			pd = of_phy_find_device(phy_np);
+			if (!pd)
+				return -EPROBE_DEFER;
+			bgx->lmac[lmac].phydev = pd;
+		}
+
 		lmac++;
 		if (lmac == MAX_LMAC_PER_BGX) {
 			of_node_put(node);
@@ -1032,9 +1042,6 @@ static int bgx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	struct bgx *bgx = NULL;
 	u8 lmac;
 
-	/* Load octeon mdio driver */
-	octeon_mdiobus_force_mod_depencency();
-
 	bgx = devm_kzalloc(dev, sizeof(*bgx), GFP_KERNEL);
 	if (!bgx)
 		return -ENOMEM;
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index f0a77020037a..075a4cc175b1 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -183,15 +183,29 @@ config MDIO_GPIO
 	  To compile this driver as a module, choose M here: the module
 	  will be called mdio-gpio.
 
+config MDIO_CAVIUM
+	tristate
+
 config MDIO_OCTEON
-	tristate "Support for MDIO buses on Octeon and ThunderX SOCs"
+	tristate "Support for MDIO buses on Octeon and some ThunderX SOCs"
 	depends on 64BIT
 	depends on HAS_IOMEM
+	select MDIO_CAVIUM
 	help
-
 	  This module provides a driver for the Octeon and ThunderX MDIO
-	  busses. It is required by the Octeon and ThunderX ethernet device
-	  drivers.
+	  buses. It is required by the Octeon and ThunderX ethernet device
+	  drivers on some systems.
+
+config MDIO_THUNDER
+	tristate "Support for MDIO buses on on ThunderX SOCs"
+	depends on 64BIT
+	depends on PCI
+	select MDIO_CAVIUM
+	help
+	  This driver supports the MDIO interfaces found on Cavium
+	  ThunderX SoCs when the MDIO bus device appears on as a PCI
+	  device.
+
 
 config MDIO_SUN4I
 	tristate "Allwinner sun4i MDIO interface support"
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 680e88f9915a..fcdbb9299fab 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -31,6 +31,8 @@ obj-$(CONFIG_DP83867_PHY)	+= dp83867.o
 obj-$(CONFIG_STE10XP)		+= ste10Xp.o
 obj-$(CONFIG_MICREL_PHY)	+= micrel.o
 obj-$(CONFIG_MDIO_OCTEON)	+= mdio-octeon.o
+obj-$(CONFIG_MDIO_THUNDER)	+= mdio-thunder.o
+obj-$(CONFIG_MDIO_CAVIUM)	+= mdio-cavium.o
 obj-$(CONFIG_MICREL_KS8995MA)	+= spi_ks8995.o
 obj-$(CONFIG_AT803X_PHY)	+= at803x.o
 obj-$(CONFIG_AMD_PHY)		+= amd.o
diff --git a/drivers/net/phy/mdio-cavium.c b/drivers/net/phy/mdio-cavium.c
new file mode 100644
index 000000000000..e796ee121eac
--- /dev/null
+++ b/drivers/net/phy/mdio-cavium.c
@@ -0,0 +1,149 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009-2016 Cavium, Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/phy.h>
+#include <linux/io.h>
+
+#include "mdio-cavium.h"
+
+static void cavium_mdiobus_set_mode(struct cavium_mdiobus *p,
+				    enum cavium_mdiobus_mode m)
+{
+	union cvmx_smix_clk smi_clk;
+
+	if (m == p->mode)
+		return;
+
+	smi_clk.u64 = oct_mdio_readq(p->register_base + SMI_CLK);
+	smi_clk.s.mode = (m == C45) ? 1 : 0;
+	smi_clk.s.preamble = 1;
+	oct_mdio_writeq(smi_clk.u64, p->register_base + SMI_CLK);
+	p->mode = m;
+}
+
+static int cavium_mdiobus_c45_addr(struct cavium_mdiobus *p,
+				   int phy_id, int regnum)
+{
+	union cvmx_smix_cmd smi_cmd;
+	union cvmx_smix_wr_dat smi_wr;
+	int timeout = 1000;
+
+	cavium_mdiobus_set_mode(p, C45);
+
+	smi_wr.u64 = 0;
+	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;
+	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;
+}
+
+int cavium_mdiobus_read(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);
+
+		if (r < 0)
+			return r;
+
+		regnum = (regnum >> 16) & 0x1f;
+		op = 3; /* MDIO_CLAUSE_45_READ */
+	} else {
+		cavium_mdiobus_set_mode(p, C22);
+	}
+
+	smi_cmd.u64 = 0;
+	smi_cmd.s.phy_op = op;
+	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);
+
+int cavium_mdiobus_write(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);
+
+		if (r < 0)
+			return r;
+
+		regnum = (regnum >> 16) & 0x1f;
+		op = 1; /* MDIO_CLAUSE_45_WRITE */
+	} else {
+		cavium_mdiobus_set_mode(p, C22);
+	}
+
+	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_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);
diff --git a/drivers/net/phy/mdio-cavium.h b/drivers/net/phy/mdio-cavium.h
new file mode 100644
index 000000000000..4bccd45d24e2
--- /dev/null
+++ b/drivers/net/phy/mdio-cavium.h
@@ -0,0 +1,119 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009-2016 Cavium, Inc.
+ */
+
+enum cavium_mdiobus_mode {
+	UNINIT = 0,
+	C22,
+	C45
+};
+
+#define SMI_CMD		0x0
+#define SMI_WR_DAT	0x8
+#define SMI_RD_DAT	0x10
+#define SMI_CLK		0x18
+#define SMI_EN		0x20
+
+#ifdef __BIG_ENDIAN_BITFIELD
+#define OCT_MDIO_BITFIELD_FIELD(field, more)	\
+	field;					\
+	more
+
+#else
+#define OCT_MDIO_BITFIELD_FIELD(field, more)	\
+	more					\
+	field;
+
+#endif
+
+union cvmx_smix_clk {
+	u64 u64;
+	struct cvmx_smix_clk_s {
+	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_25_63:39,
+	  OCT_MDIO_BITFIELD_FIELD(u64 mode:1,
+	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_21_23:3,
+	  OCT_MDIO_BITFIELD_FIELD(u64 sample_hi:5,
+	  OCT_MDIO_BITFIELD_FIELD(u64 sample_mode:1,
+	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_14_14:1,
+	  OCT_MDIO_BITFIELD_FIELD(u64 clk_idle:1,
+	  OCT_MDIO_BITFIELD_FIELD(u64 preamble:1,
+	  OCT_MDIO_BITFIELD_FIELD(u64 sample:4,
+	  OCT_MDIO_BITFIELD_FIELD(u64 phase:8,
+	  ;))))))))))
+	} s;
+};
+
+union cvmx_smix_cmd {
+	u64 u64;
+	struct cvmx_smix_cmd_s {
+	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_18_63:46,
+	  OCT_MDIO_BITFIELD_FIELD(u64 phy_op:2,
+	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_13_15:3,
+	  OCT_MDIO_BITFIELD_FIELD(u64 phy_adr:5,
+	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_5_7:3,
+	  OCT_MDIO_BITFIELD_FIELD(u64 reg_adr:5,
+	  ;))))))
+	} s;
+};
+
+union cvmx_smix_en {
+	u64 u64;
+	struct cvmx_smix_en_s {
+	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_1_63:63,
+	  OCT_MDIO_BITFIELD_FIELD(u64 en:1,
+	  ;))
+	} s;
+};
+
+union cvmx_smix_rd_dat {
+	u64 u64;
+	struct cvmx_smix_rd_dat_s {
+	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_18_63:46,
+	  OCT_MDIO_BITFIELD_FIELD(u64 pending:1,
+	  OCT_MDIO_BITFIELD_FIELD(u64 val:1,
+	  OCT_MDIO_BITFIELD_FIELD(u64 dat:16,
+	  ;))))
+	} s;
+};
+
+union cvmx_smix_wr_dat {
+	u64 u64;
+	struct cvmx_smix_wr_dat_s {
+	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_18_63:46,
+	  OCT_MDIO_BITFIELD_FIELD(u64 pending:1,
+	  OCT_MDIO_BITFIELD_FIELD(u64 val:1,
+	  OCT_MDIO_BITFIELD_FIELD(u64 dat:16,
+	  ;))))
+	} s;
+};
+
+struct cavium_mdiobus {
+	struct mii_bus *mii_bus;
+	u64 register_base;
+	enum cavium_mdiobus_mode mode;
+};
+
+#ifdef CONFIG_CAVIUM_OCTEON_SOC
+
+#include <asm/octeon/octeon.h>
+
+static inline void oct_mdio_writeq(u64 val, u64 addr)
+{
+	cvmx_write_csr(addr, val);
+}
+
+static inline u64 oct_mdio_readq(u64 addr)
+{
+	return cvmx_read_csr(addr);
+}
+#else
+#define oct_mdio_writeq(val, addr)	writeq(val, (void *)addr)
+#define oct_mdio_readq(addr)		readq((void *)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);
diff --git a/drivers/net/phy/mdio-octeon.c b/drivers/net/phy/mdio-octeon.c
index 47d4f2f263d1..ab6914f8bd50 100644
--- a/drivers/net/phy/mdio-octeon.c
+++ b/drivers/net/phy/mdio-octeon.c
@@ -3,272 +3,26 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 2009-2012 Cavium, Inc.
+ * Copyright (C) 2009-2015 Cavium, Inc.
  */
 
 #include <linux/platform_device.h>
 #include <linux/of_address.h>
 #include <linux/of_mdio.h>
-#include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/gfp.h>
 #include <linux/phy.h>
 #include <linux/io.h>
 
-#ifdef CONFIG_CAVIUM_OCTEON_SOC
-#include <asm/octeon/octeon.h>
-#endif
-
-#define DRV_VERSION "1.1"
-#define DRV_DESCRIPTION "Cavium Networks Octeon/ThunderX SMI/MDIO driver"
-
-#define SMI_CMD		0x0
-#define SMI_WR_DAT	0x8
-#define SMI_RD_DAT	0x10
-#define SMI_CLK		0x18
-#define SMI_EN		0x20
-
-#ifdef __BIG_ENDIAN_BITFIELD
-#define OCT_MDIO_BITFIELD_FIELD(field, more)	\
-	field;					\
-	more
-
-#else
-#define OCT_MDIO_BITFIELD_FIELD(field, more)	\
-	more					\
-	field;
-
-#endif
-
-union cvmx_smix_clk {
-	u64 u64;
-	struct cvmx_smix_clk_s {
-	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_25_63:39,
-	  OCT_MDIO_BITFIELD_FIELD(u64 mode:1,
-	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_21_23:3,
-	  OCT_MDIO_BITFIELD_FIELD(u64 sample_hi:5,
-	  OCT_MDIO_BITFIELD_FIELD(u64 sample_mode:1,
-	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_14_14:1,
-	  OCT_MDIO_BITFIELD_FIELD(u64 clk_idle:1,
-	  OCT_MDIO_BITFIELD_FIELD(u64 preamble:1,
-	  OCT_MDIO_BITFIELD_FIELD(u64 sample:4,
-	  OCT_MDIO_BITFIELD_FIELD(u64 phase:8,
-	  ;))))))))))
-	} s;
-};
-
-union cvmx_smix_cmd {
-	u64 u64;
-	struct cvmx_smix_cmd_s {
-	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_18_63:46,
-	  OCT_MDIO_BITFIELD_FIELD(u64 phy_op:2,
-	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_13_15:3,
-	  OCT_MDIO_BITFIELD_FIELD(u64 phy_adr:5,
-	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_5_7:3,
-	  OCT_MDIO_BITFIELD_FIELD(u64 reg_adr:5,
-	  ;))))))
-	} s;
-};
-
-union cvmx_smix_en {
-	u64 u64;
-	struct cvmx_smix_en_s {
-	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_1_63:63,
-	  OCT_MDIO_BITFIELD_FIELD(u64 en:1,
-	  ;))
-	} s;
-};
-
-union cvmx_smix_rd_dat {
-	u64 u64;
-	struct cvmx_smix_rd_dat_s {
-	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_18_63:46,
-	  OCT_MDIO_BITFIELD_FIELD(u64 pending:1,
-	  OCT_MDIO_BITFIELD_FIELD(u64 val:1,
-	  OCT_MDIO_BITFIELD_FIELD(u64 dat:16,
-	  ;))))
-	} s;
-};
-
-union cvmx_smix_wr_dat {
-	u64 u64;
-	struct cvmx_smix_wr_dat_s {
-	  OCT_MDIO_BITFIELD_FIELD(u64 reserved_18_63:46,
-	  OCT_MDIO_BITFIELD_FIELD(u64 pending:1,
-	  OCT_MDIO_BITFIELD_FIELD(u64 val:1,
-	  OCT_MDIO_BITFIELD_FIELD(u64 dat:16,
-	  ;))))
-	} s;
-};
-
-enum octeon_mdiobus_mode {
-	UNINIT = 0,
-	C22,
-	C45
-};
-
-struct octeon_mdiobus {
-	struct mii_bus *mii_bus;
-	u64 register_base;
-	resource_size_t mdio_phys;
-	resource_size_t regsize;
-	enum octeon_mdiobus_mode mode;
-};
-
-#ifdef CONFIG_CAVIUM_OCTEON_SOC
-static void oct_mdio_writeq(u64 val, u64 addr)
-{
-	cvmx_write_csr(addr, val);
-}
-
-static u64 oct_mdio_readq(u64 addr)
-{
-	return cvmx_read_csr(addr);
-}
-#else
-#define oct_mdio_writeq(val, addr)	writeq_relaxed(val, (void *)addr)
-#define oct_mdio_readq(addr)		readq_relaxed((void *)addr)
-#endif
-
-static void octeon_mdiobus_set_mode(struct octeon_mdiobus *p,
-				    enum octeon_mdiobus_mode m)
-{
-	union cvmx_smix_clk smi_clk;
-
-	if (m == p->mode)
-		return;
-
-	smi_clk.u64 = oct_mdio_readq(p->register_base + SMI_CLK);
-	smi_clk.s.mode = (m == C45) ? 1 : 0;
-	smi_clk.s.preamble = 1;
-	oct_mdio_writeq(smi_clk.u64, p->register_base + SMI_CLK);
-	p->mode = m;
-}
-
-static int octeon_mdiobus_c45_addr(struct octeon_mdiobus *p,
-				   int phy_id, int regnum)
-{
-	union cvmx_smix_cmd smi_cmd;
-	union cvmx_smix_wr_dat smi_wr;
-	int timeout = 1000;
-
-	octeon_mdiobus_set_mode(p, C45);
-
-	smi_wr.u64 = 0;
-	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;
-	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;
-}
-
-static int octeon_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
-{
-	struct octeon_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 = octeon_mdiobus_c45_addr(p, phy_id, regnum);
-		if (r < 0)
-			return r;
-
-		regnum = (regnum >> 16) & 0x1f;
-		op = 3; /* MDIO_CLAUSE_45_READ */
-	} else {
-		octeon_mdiobus_set_mode(p, C22);
-	}
-
-
-	smi_cmd.u64 = 0;
-	smi_cmd.s.phy_op = op;
-	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;
-}
-
-static int octeon_mdiobus_write(struct mii_bus *bus, int phy_id,
-				int regnum, u16 val)
-{
-	struct octeon_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 = octeon_mdiobus_c45_addr(p, phy_id, regnum);
-		if (r < 0)
-			return r;
-
-		regnum = (regnum >> 16) & 0x1f;
-		op = 1; /* MDIO_CLAUSE_45_WRITE */
-	} else {
-		octeon_mdiobus_set_mode(p, C22);
-	}
-
-	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_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;
-}
+#include "mdio-cavium.h"
 
 static int octeon_mdiobus_probe(struct platform_device *pdev)
 {
-	struct octeon_mdiobus *bus;
+	struct cavium_mdiobus *bus;
 	struct mii_bus *mii_bus;
 	struct resource *res_mem;
+	resource_size_t mdio_phys;
+	resource_size_t regsize;
 	union cvmx_smix_en smi_en;
 	int err = -ENOENT;
 
@@ -284,17 +38,17 @@ static int octeon_mdiobus_probe(struct platform_device *pdev)
 
 	bus = mii_bus->priv;
 	bus->mii_bus = mii_bus;
-	bus->mdio_phys = res_mem->start;
-	bus->regsize = resource_size(res_mem);
+	mdio_phys = res_mem->start;
+	regsize = resource_size(res_mem);
 
-	if (!devm_request_mem_region(&pdev->dev, bus->mdio_phys, bus->regsize,
+	if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
 				     res_mem->name)) {
 		dev_err(&pdev->dev, "request_mem_region failed\n");
 		return -ENXIO;
 	}
 
 	bus->register_base =
-		(u64)devm_ioremap(&pdev->dev, bus->mdio_phys, bus->regsize);
+		(u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
 	if (!bus->register_base) {
 		dev_err(&pdev->dev, "dev_ioremap failed\n");
 		return -ENOMEM;
@@ -304,13 +58,12 @@ static int octeon_mdiobus_probe(struct platform_device *pdev)
 	smi_en.s.en = 1;
 	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 
-	bus->mii_bus->priv = bus;
-	bus->mii_bus->name = "mdio-octeon";
+	bus->mii_bus->name = KBUILD_MODNAME;
 	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
 	bus->mii_bus->parent = &pdev->dev;
 
-	bus->mii_bus->read = octeon_mdiobus_read;
-	bus->mii_bus->write = octeon_mdiobus_write;
+	bus->mii_bus->read = cavium_mdiobus_read;
+	bus->mii_bus->write = cavium_mdiobus_write;
 
 	platform_set_drvdata(pdev, bus);
 
@@ -318,7 +71,7 @@ static int octeon_mdiobus_probe(struct platform_device *pdev)
 	if (err)
 		goto fail_register;
 
-	dev_info(&pdev->dev, "Version " DRV_VERSION "\n");
+	dev_info(&pdev->dev, "Probed\n");
 
 	return 0;
 fail_register:
@@ -330,7 +83,7 @@ fail_register:
 
 static int octeon_mdiobus_remove(struct platform_device *pdev)
 {
-	struct octeon_mdiobus *bus;
+	struct cavium_mdiobus *bus;
 	union cvmx_smix_en smi_en;
 
 	bus = platform_get_drvdata(pdev);
@@ -352,7 +105,7 @@ MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
 
 static struct platform_driver octeon_mdiobus_driver = {
 	.driver = {
-		.name		= "mdio-octeon",
+		.name		= KBUILD_MODNAME,
 		.of_match_table = octeon_mdiobus_match,
 	},
 	.probe		= octeon_mdiobus_probe,
@@ -367,7 +120,6 @@ EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
 
 module_platform_driver(octeon_mdiobus_driver);
 
-MODULE_DESCRIPTION(DRV_DESCRIPTION);
-MODULE_VERSION(DRV_VERSION);
+MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
 MODULE_AUTHOR("David Daney");
 MODULE_LICENSE("GPL");
diff --git a/drivers/net/phy/mdio-thunder.c b/drivers/net/phy/mdio-thunder.c
new file mode 100644
index 000000000000..564616968cad
--- /dev/null
+++ b/drivers/net/phy/mdio-thunder.c
@@ -0,0 +1,154 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009-2016 Cavium, Inc.
+ */
+
+#include <linux/of_address.h>
+#include <linux/of_mdio.h>
+#include <linux/module.h>
+#include <linux/gfp.h>
+#include <linux/phy.h>
+#include <linux/io.h>
+#include <linux/acpi.h>
+#include <linux/pci.h>
+
+#include "mdio-cavium.h"
+
+struct thunder_mdiobus_nexus {
+	void __iomem *bar0;
+	struct cavium_mdiobus *buses[4];
+};
+
+static int thunder_mdiobus_pci_probe(struct pci_dev *pdev,
+				     const struct pci_device_id *ent)
+{
+	struct device_node *node;
+	struct fwnode_handle *fwn;
+	struct thunder_mdiobus_nexus *nexus;
+	int err;
+	int i;
+
+	nexus = devm_kzalloc(&pdev->dev, sizeof(*nexus), GFP_KERNEL);
+	if (!nexus)
+		return -ENOMEM;
+
+	pci_set_drvdata(pdev, nexus);
+
+	err = pcim_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to enable PCI device\n");
+		pci_set_drvdata(pdev, NULL);
+		return err;
+	}
+
+	err = pci_request_regions(pdev, KBUILD_MODNAME);
+	if (err) {
+		dev_err(&pdev->dev, "pci_request_regions failed\n");
+		goto err_disable_device;
+	}
+
+	nexus->bar0 = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
+	if (!nexus->bar0) {
+		err = -ENOMEM;
+		goto err_release_regions;
+	}
+
+	i = 0;
+	device_for_each_child_node(&pdev->dev, fwn) {
+		struct resource r;
+		struct mii_bus *mii_bus;
+		struct cavium_mdiobus *bus;
+		union cvmx_smix_en smi_en;
+
+		/* If it is not an OF node we cannot handle it yet, so
+		 * exit the loop.
+		 */
+		node = to_of_node(fwn);
+		if (!node)
+			break;
+
+		err = of_address_to_resource(node, 0, &r);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Couldn't translate address for \"%s\"\n",
+				node->name);
+			break;
+		}
+
+		mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
+		if (!mii_bus)
+			break;
+		bus = mii_bus->priv;
+		bus->mii_bus = mii_bus;
+
+		nexus->buses[i] = bus;
+		i++;
+
+		bus->register_base = (u64)nexus->bar0 +
+			r.start - pci_resource_start(pdev, 0);
+
+		smi_en.u64 = 0;
+		smi_en.s.en = 1;
+		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", r.start);
+		bus->mii_bus->parent = &pdev->dev;
+		bus->mii_bus->read = cavium_mdiobus_read;
+		bus->mii_bus->write = cavium_mdiobus_write;
+
+		err = of_mdiobus_register(bus->mii_bus, node);
+		if (err)
+			dev_err(&pdev->dev, "of_mdiobus_register failed\n");
+
+		dev_info(&pdev->dev, "Added bus at %llx\n", r.start);
+		if (i >= ARRAY_SIZE(nexus->buses))
+			break;
+	}
+	return 0;
+
+err_release_regions:
+	pci_release_regions(pdev);
+
+err_disable_device:
+	pci_set_drvdata(pdev, NULL);
+	return err;
+}
+
+static void thunder_mdiobus_pci_remove(struct pci_dev *pdev)
+{
+	int i;
+	struct thunder_mdiobus_nexus *nexus = pci_get_drvdata(pdev);
+
+	for (i = 0; i < ARRAY_SIZE(nexus->buses); i++) {
+		struct cavium_mdiobus *bus = nexus->buses[i];
+
+		if (!bus)
+			continue;
+
+		mdiobus_unregister(bus->mii_bus);
+		mdiobus_free(bus->mii_bus);
+		oct_mdio_writeq(0, bus->register_base + SMI_EN);
+	}
+	pci_set_drvdata(pdev, NULL);
+}
+
+static const struct pci_device_id thunder_mdiobus_id_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa02b) },
+	{ 0, } /* End of table. */
+};
+MODULE_DEVICE_TABLE(pci, thunder_mdiobus_id_table);
+
+static struct pci_driver thunder_mdiobus_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = thunder_mdiobus_id_table,
+	.probe = thunder_mdiobus_pci_probe,
+	.remove = thunder_mdiobus_pci_remove,
+};
+
+module_pci_driver(thunder_mdiobus_driver);
+
+MODULE_DESCRIPTION("Cavium ThunderX MDIO bus driver");
+MODULE_LICENSE("GPL");