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1// SPDX-License-Identifier: GPL-2.02/*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");115