| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright (C) 2009-2015 Cavium, Inc. |
| 4 | */ |
| 5 | |
| 6 | #include <linux/platform_device.h> |
| 7 | #include <linux/of_address.h> |
| 8 | #include <linux/of_mdio.h> |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/gfp.h> |
| 11 | #include <linux/phy.h> |
| 12 | #include <linux/io.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"); |