1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2009-2015 Cavium, Inc.
  4 */
  5
  6#include <linux/gfp.h>
  7#include <linux/io.h>
  8#include <linux/module.h>
  9#include <linux/of_address.h>
 10#include <linux/of_mdio.h>
 11#include <linux/phy.h>
 12#include <linux/platform_device.h>
 13
 14#include "mdio-cavium.h"
 15
 16static int octeon_mdiobus_probe(struct platform_device *pdev)
 17{
 18	struct cavium_mdiobus *bus;
 19	struct mii_bus *mii_bus;
 20	struct resource *res_mem;
 21	resource_size_t mdio_phys;
 22	resource_size_t regsize;
 23	union cvmx_smix_en smi_en;
 24	int err = -ENOENT;
 25
 26	mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
 27	if (!mii_bus)
 28		return -ENOMEM;
 29
 30	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 31	if (res_mem == NULL) {
 32		dev_err(&pdev->dev, "found no memory resource\n");
 33		return -ENXIO;
 34	}
 35
 36	bus = mii_bus->priv;
 37	bus->mii_bus = mii_bus;
 38	mdio_phys = res_mem->start;
 39	regsize = resource_size(res_mem);
 40
 41	if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
 42				     res_mem->name)) {
 43		dev_err(&pdev->dev, "request_mem_region failed\n");
 44		return -ENXIO;
 45	}
 46
 47	bus->register_base = devm_ioremap(&pdev->dev, mdio_phys, regsize);
 48	if (!bus->register_base) {
 49		dev_err(&pdev->dev, "dev_ioremap failed\n");
 50		return -ENOMEM;
 51	}
 52
 53	smi_en.u64 = 0;
 54	smi_en.s.en = 1;
 55	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 56
 57	bus->mii_bus->name = KBUILD_MODNAME;
 58	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%px", bus->register_base);
 59	bus->mii_bus->parent = &pdev->dev;
 60
 61	bus->mii_bus->read = cavium_mdiobus_read_c22;
 62	bus->mii_bus->write = cavium_mdiobus_write_c22;
 63	bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
 64	bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;
 65
 66	platform_set_drvdata(pdev, bus);
 67
 68	err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
 69	if (err)
 70		goto fail_register;
 71
 72	dev_info(&pdev->dev, "Probed\n");
 73
 74	return 0;
 75fail_register:
 76	smi_en.u64 = 0;
 77	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 78	return err;
 79}
 80
 81static void octeon_mdiobus_remove(struct platform_device *pdev)
 82{
 83	struct cavium_mdiobus *bus;
 84	union cvmx_smix_en smi_en;
 85
 86	bus = platform_get_drvdata(pdev);
 87
 88	mdiobus_unregister(bus->mii_bus);
 89	smi_en.u64 = 0;
 90	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 91}
 92
 93static const struct of_device_id octeon_mdiobus_match[] = {
 94	{
 95		.compatible = "cavium,octeon-3860-mdio",
 96	},
 97	{},
 98};
 99MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
100
101static struct platform_driver octeon_mdiobus_driver = {
102	.driver = {
103		.name		= KBUILD_MODNAME,
104		.of_match_table = octeon_mdiobus_match,
105	},
106	.probe		= octeon_mdiobus_probe,
107	.remove_new	= octeon_mdiobus_remove,
108};
109
110module_platform_driver(octeon_mdiobus_driver);
111
112MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
113MODULE_AUTHOR("David Daney");
114MODULE_LICENSE("GPL v2");