cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mdio-octeon.c (2676B)

      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;
     62	bus->mii_bus->write = cavium_mdiobus_write;
     63
     64	platform_set_drvdata(pdev, bus);
     65
     66	err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
     67	if (err)
     68		goto fail_register;
     69
     70	dev_info(&pdev->dev, "Probed\n");
     71
     72	return 0;
     73fail_register:
     74	smi_en.u64 = 0;
     75	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
     76	return err;
     77}
     78
     79static int octeon_mdiobus_remove(struct platform_device *pdev)
     80{
     81	struct cavium_mdiobus *bus;
     82	union cvmx_smix_en smi_en;
     83
     84	bus = platform_get_drvdata(pdev);
     85
     86	mdiobus_unregister(bus->mii_bus);
     87	smi_en.u64 = 0;
     88	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
     89	return 0;
     90}
     91
     92static const struct of_device_id octeon_mdiobus_match[] = {
     93	{
     94		.compatible = "cavium,octeon-3860-mdio",
     95	},
     96	{},
     97};
     98MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
     99
    100static struct platform_driver octeon_mdiobus_driver = {
    101	.driver = {
    102		.name		= KBUILD_MODNAME,
    103		.of_match_table = octeon_mdiobus_match,
    104	},
    105	.probe		= octeon_mdiobus_probe,
    106	.remove		= octeon_mdiobus_remove,
    107};
    108
    109module_platform_driver(octeon_mdiobus_driver);
    110
    111MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
    112MODULE_AUTHOR("David Daney");
    113MODULE_LICENSE("GPL v2");