1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/net/mdio/mdio-octeon.c b/drivers/net/mdio/mdio-octeon.c
new file mode 100644
index 000000000000..d1e1009d51af
--- /dev/null
+++ b/drivers/net/mdio/mdio-octeon.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2009-2015 Cavium, Inc.
+ */
+
+#include <linux/platform_device.h>
+#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 "mdio-cavium.h"
+
+static int octeon_mdiobus_probe(struct platform_device *pdev)
+{
+	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;
+
+	mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
+	if (!mii_bus)
+		return -ENOMEM;
+
+	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res_mem == NULL) {
+		dev_err(&pdev->dev, "found no memory resource\n");
+		return -ENXIO;
+	}
+
+	bus = mii_bus->priv;
+	bus->mii_bus = mii_bus;
+	mdio_phys = res_mem->start;
+	regsize = resource_size(res_mem);
+
+	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 = devm_ioremap(&pdev->dev, mdio_phys, regsize);
+	if (!bus->register_base) {
+		dev_err(&pdev->dev, "dev_ioremap failed\n");
+		return -ENOMEM;
+	}
+
+	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, "%px", bus->register_base);
+	bus->mii_bus->parent = &pdev->dev;
+
+	bus->mii_bus->read = cavium_mdiobus_read;
+	bus->mii_bus->write = cavium_mdiobus_write;
+
+	platform_set_drvdata(pdev, bus);
+
+	err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
+	if (err)
+		goto fail_register;
+
+	dev_info(&pdev->dev, "Probed\n");
+
+	return 0;
+fail_register:
+	mdiobus_free(bus->mii_bus);
+	smi_en.u64 = 0;
+	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
+	return err;
+}
+
+static int octeon_mdiobus_remove(struct platform_device *pdev)
+{
+	struct cavium_mdiobus *bus;
+	union cvmx_smix_en smi_en;
+
+	bus = platform_get_drvdata(pdev);
+
+	mdiobus_unregister(bus->mii_bus);
+	mdiobus_free(bus->mii_bus);
+	smi_en.u64 = 0;
+	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
+	return 0;
+}
+
+static const struct of_device_id octeon_mdiobus_match[] = {
+	{
+		.compatible = "cavium,octeon-3860-mdio",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
+
+static struct platform_driver octeon_mdiobus_driver = {
+	.driver = {
+		.name		= KBUILD_MODNAME,
+		.of_match_table = octeon_mdiobus_match,
+	},
+	.probe		= octeon_mdiobus_probe,
+	.remove		= octeon_mdiobus_remove,
+};
+
+module_platform_driver(octeon_mdiobus_driver);
+
+MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
+MODULE_AUTHOR("David Daney");
+MODULE_LICENSE("GPL v2");