1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 2009-2015 Cavium, Inc.
  7 */
  8
  9#include <linux/platform_device.h>
 10#include <linux/of_address.h>
 11#include <linux/of_mdio.h>
 12#include <linux/module.h>
 13#include <linux/gfp.h>
 14#include <linux/phy.h>
 15#include <linux/io.h>
 16
 17#include "mdio-cavium.h"
 18
 19static int octeon_mdiobus_probe(struct platform_device *pdev)
 20{
 21	struct cavium_mdiobus *bus;
 22	struct mii_bus *mii_bus;
 23	struct resource *res_mem;
 24	resource_size_t mdio_phys;
 25	resource_size_t regsize;
 26	union cvmx_smix_en smi_en;
 27	int err = -ENOENT;
 28
 29	mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
 30	if (!mii_bus)
 31		return -ENOMEM;
 32
 33	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 34	if (res_mem == NULL) {
 35		dev_err(&pdev->dev, "found no memory resource\n");
 36		return -ENXIO;
 37	}
 38
 39	bus = mii_bus->priv;
 40	bus->mii_bus = mii_bus;
 41	mdio_phys = res_mem->start;
 42	regsize = resource_size(res_mem);
 43
 44	if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
 45				     res_mem->name)) {
 46		dev_err(&pdev->dev, "request_mem_region failed\n");
 47		return -ENXIO;
 48	}
 49
 50	bus->register_base =
 51		(u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
 52	if (!bus->register_base) {
 53		dev_err(&pdev->dev, "dev_ioremap failed\n");
 54		return -ENOMEM;
 55	}
 56
 57	smi_en.u64 = 0;
 58	smi_en.s.en = 1;
 59	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 60
 61	bus->mii_bus->name = KBUILD_MODNAME;
 62	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
 63	bus->mii_bus->parent = &pdev->dev;
 64
 65	bus->mii_bus->read = cavium_mdiobus_read;
 66	bus->mii_bus->write = cavium_mdiobus_write;
 67
 68	platform_set_drvdata(pdev, bus);
 69
 70	err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
 71	if (err)
 72		goto fail_register;
 73
 74	dev_info(&pdev->dev, "Probed\n");
 75
 76	return 0;
 77fail_register:
 78	mdiobus_free(bus->mii_bus);
 79	smi_en.u64 = 0;
 80	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 81	return err;
 82}
 83
 84static int octeon_mdiobus_remove(struct platform_device *pdev)
 85{
 86	struct cavium_mdiobus *bus;
 87	union cvmx_smix_en smi_en;
 88
 89	bus = platform_get_drvdata(pdev);
 90
 91	mdiobus_unregister(bus->mii_bus);
 92	mdiobus_free(bus->mii_bus);
 93	smi_en.u64 = 0;
 94	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
 95	return 0;
 96}
 97
 98static const struct of_device_id octeon_mdiobus_match[] = {
 99	{
100		.compatible = "cavium,octeon-3860-mdio",
101	},
102	{},
103};
104MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
105
106static struct platform_driver octeon_mdiobus_driver = {
107	.driver = {
108		.name		= KBUILD_MODNAME,
109		.of_match_table = octeon_mdiobus_match,
110	},
111	.probe		= octeon_mdiobus_probe,
112	.remove		= octeon_mdiobus_remove,
113};
114
115void octeon_mdiobus_force_mod_depencency(void)
116{
117	/* Let ethernet drivers force us to be loaded.  */
118}
119EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
120
121module_platform_driver(octeon_mdiobus_driver);
122
123MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
124MODULE_AUTHOR("David Daney");
125MODULE_LICENSE("GPL");