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 16 static int octeon_mdiobus_probe(struct platform_device *pdev) 17 { 18 struct cavium_mdiobus *bus; 19 struct mii_bus *mii_bus; 20 union cvmx_smix_en smi_en; 21 int err; 22 23 mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus)); 24 if (!mii_bus) 25 return -ENOMEM; 26 27 bus = mii_bus->priv; 28 bus->mii_bus = mii_bus; 29 30 bus->register_base = devm_platform_ioremap_resource(pdev, 0); 31 if (IS_ERR(bus->register_base)) { 32 dev_err(&pdev->dev, "dev_ioremap failed\n"); 33 return PTR_ERR(bus->register_base); 34 } 35 36 smi_en.u64 = 0; 37 smi_en.s.en = 1; 38 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN); 39 40 bus->mii_bus->name = KBUILD_MODNAME; 41 snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%px", bus->register_base); 42 bus->mii_bus->parent = &pdev->dev; 43 44 bus->mii_bus->read = cavium_mdiobus_read_c22; 45 bus->mii_bus->write = cavium_mdiobus_write_c22; 46 bus->mii_bus->read_c45 = cavium_mdiobus_read_c45; 47 bus->mii_bus->write_c45 = cavium_mdiobus_write_c45; 48 49 platform_set_drvdata(pdev, bus); 50 51 err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node); 52 if (err) 53 goto fail_register; 54 55 dev_info(&pdev->dev, "Probed\n"); 56 57 return 0; 58 fail_register: 59 smi_en.u64 = 0; 60 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN); 61 return err; 62 } 63 64 static void octeon_mdiobus_remove(struct platform_device *pdev) 65 { 66 struct cavium_mdiobus *bus; 67 union cvmx_smix_en smi_en; 68 69 bus = platform_get_drvdata(pdev); 70 71 mdiobus_unregister(bus->mii_bus); 72 smi_en.u64 = 0; 73 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN); 74 } 75 76 static const struct of_device_id octeon_mdiobus_match[] = { 77 { 78 .compatible = "cavium,octeon-3860-mdio", 79 }, 80 {}, 81 }; 82 MODULE_DEVICE_TABLE(of, octeon_mdiobus_match); 83 84 static struct platform_driver octeon_mdiobus_driver = { 85 .driver = { 86 .name = KBUILD_MODNAME, 87 .of_match_table = octeon_mdiobus_match, 88 }, 89 .probe = octeon_mdiobus_probe, 90 .remove = octeon_mdiobus_remove, 91 }; 92 93 module_platform_driver(octeon_mdiobus_driver); 94 95 MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver"); 96 MODULE_AUTHOR("David Daney"); 97 MODULE_LICENSE("GPL v2"); 98