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 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; 73 fail_register: 74 smi_en.u64 = 0; 75 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN); 76 return err; 77 } 78 79 static 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 92 static const struct of_device_id octeon_mdiobus_match[] = { 93 { 94 .compatible = "cavium,octeon-3860-mdio", 95 }, 96 {}, 97 }; 98 MODULE_DEVICE_TABLE(of, octeon_mdiobus_match); 99 100 static 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 }; 108 109 module_platform_driver(octeon_mdiobus_driver); 110 111 MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver"); 112 MODULE_AUTHOR("David Daney"); 113 MODULE_LICENSE("GPL v2"); 114