| 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 | |
| 19 | static 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; |
| 77 | fail_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 | |
| 84 | static 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 | |
| 98 | static const struct of_device_id octeon_mdiobus_match[] = { |
| 99 | { |
| 100 | .compatible = "cavium,octeon-3860-mdio", |
| 101 | }, |
| 102 | {}, |
| 103 | }; |
| 104 | MODULE_DEVICE_TABLE(of, octeon_mdiobus_match); |
| 105 | |
| 106 | static 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 | |
| 115 | void octeon_mdiobus_force_mod_depencency(void) |
| 116 | { |
| 117 | /* Let ethernet drivers force us to be loaded. */ |
| 118 | } |
| 119 | EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency); |
| 120 | |
| 121 | module_platform_driver(octeon_mdiobus_driver); |
| 122 | |
| 123 | MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver"); |
| 124 | MODULE_AUTHOR("David Daney"); |
| 125 | MODULE_LICENSE("GPL"); |