1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2009-2015 Cavium, Inc.
  4 */
  5
  6#include <linux/platform_device.h>
  7#include <linux/of_address.h>
  8#include <linux/of_mdio.h>
  9#include <linux/module.h>
 10#include <linux/gfp.h>
 11#include <linux/phy.h>
 12#include <linux/io.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 =
 48		(u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
 49	if (!bus->register_base) {
 50		dev_err(&pdev->dev, "dev_ioremap failed\n");
 51		return -ENOMEM;
 52	}
 53
 54	smi_en.u64 = 0;
 55	smi_en.s.en = 1;
 56	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 57
 58	bus->mii_bus->name = KBUILD_MODNAME;
 59	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
 60	bus->mii_bus->parent = &pdev->dev;
 61
 62	bus->mii_bus->read = cavium_mdiobus_read;
 63	bus->mii_bus->write = cavium_mdiobus_write;
 64
 65	platform_set_drvdata(pdev, bus);
 66
 67	err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
 68	if (err)
 69		goto fail_register;
 70
 71	dev_info(&pdev->dev, "Probed\n");
 72
 73	return 0;
 74fail_register:
 75	mdiobus_free(bus->mii_bus);
 76	smi_en.u64 = 0;
 77	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 78	return err;
 79}
 80
 81static int 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	mdiobus_free(bus->mii_bus);
 90	smi_en.u64 = 0;
 91	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 92	return 0;
 93}
 94
 95static const struct of_device_id octeon_mdiobus_match[] = {
 96	{
 97		.compatible = "cavium,octeon-3860-mdio",
 98	},
 99	{},
100};
101MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
102
103static struct platform_driver octeon_mdiobus_driver = {
104	.driver = {
105		.name		= KBUILD_MODNAME,
106		.of_match_table = octeon_mdiobus_match,
107	},
108	.probe		= octeon_mdiobus_probe,
109	.remove		= octeon_mdiobus_remove,
110};
111
112void octeon_mdiobus_force_mod_depencency(void)
113{
114	/* Let ethernet drivers force us to be loaded.  */
115}
116EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
117
118module_platform_driver(octeon_mdiobus_driver);
119
120MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
121MODULE_AUTHOR("David Daney");
122MODULE_LICENSE("GPL v2");