LXR linux/drivers/net/phy/mdio-octeon.c

   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");
 126