// 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
  ");

  		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
  ");

  		return -ENXIO;

  	}

  	bus->register_base =

  		(u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);

  	if (!bus->register_base) {
  		dev_err(&pdev->dev, "dev_ioremap failed
  ");
  		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, "%llx", 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
  ");

  
  	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,

  };
  
  void octeon_mdiobus_force_mod_depencency(void)
  {
  	/* Let ethernet drivers force us to be loaded.  */
  }
  EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);

  module_platform_driver(octeon_mdiobus_driver);

  MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");

  MODULE_AUTHOR("David Daney");

  MODULE_LICENSE("GPL v2");