LXR linux/drivers/net/mdio/mdio-thunder.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2009-2016 Cavium, Inc.
   4 */
   5
   6#include <linux/acpi.h>
   7#include <linux/gfp.h>
   8#include <linux/io.h>
   9#include <linux/module.h>
  10#include <linux/of_address.h>
  11#include <linux/of_mdio.h>
  12#include <linux/pci.h>
  13#include <linux/phy.h>
  14
  15#include "mdio-cavium.h"
  16
  17struct thunder_mdiobus_nexus {
  18        void __iomem *bar0;
  19        struct cavium_mdiobus *buses[4];
  20};
  21
  22static int thunder_mdiobus_pci_probe(struct pci_dev *pdev,
  23                                     const struct pci_device_id *ent)
  24{
  25        struct device_node *node;
  26        struct fwnode_handle *fwn;
  27        struct thunder_mdiobus_nexus *nexus;
  28        int err;
  29        int i;
  30
  31        nexus = devm_kzalloc(&pdev->dev, sizeof(*nexus), GFP_KERNEL);
  32        if (!nexus)
  33                return -ENOMEM;
  34
  35        pci_set_drvdata(pdev, nexus);
  36
  37        err = pcim_enable_device(pdev);
  38        if (err) {
  39                dev_err(&pdev->dev, "Failed to enable PCI device\n");
  40                pci_set_drvdata(pdev, NULL);
  41                return err;
  42        }
  43
  44        err = pci_request_regions(pdev, KBUILD_MODNAME);
  45        if (err) {
  46                dev_err(&pdev->dev, "pci_request_regions failed\n");
  47                goto err_disable_device;
  48        }
  49
  50        nexus->bar0 = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
  51        if (!nexus->bar0) {
  52                err = -ENOMEM;
  53                goto err_release_regions;
  54        }
  55
  56        i = 0;
  57        device_for_each_child_node(&pdev->dev, fwn) {
  58                struct resource r;
  59                struct mii_bus *mii_bus;
  60                struct cavium_mdiobus *bus;
  61                union cvmx_smix_en smi_en;
  62
  63                /* If it is not an OF node we cannot handle it yet, so
  64                 * exit the loop.
  65                 */
  66                node = to_of_node(fwn);
  67                if (!node)
  68                        break;
  69
  70                err = of_address_to_resource(node, 0, &r);
  71                if (err) {
  72                        dev_err(&pdev->dev,
  73                                "Couldn't translate address for \"%pOFn\"\n",
  74                                node);
  75                        break;
  76                }
  77
  78                mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
  79                if (!mii_bus)
  80                        break;
  81                bus = mii_bus->priv;
  82                bus->mii_bus = mii_bus;
  83
  84                nexus->buses[i] = bus;
  85                i++;
  86
  87                bus->register_base = nexus->bar0 +
  88                        r.start - pci_resource_start(pdev, 0);
  89
  90                smi_en.u64 = 0;
  91                smi_en.s.en = 1;
  92                oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
  93                bus->mii_bus->name = KBUILD_MODNAME;
  94                snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", r.start);
  95                bus->mii_bus->parent = &pdev->dev;
  96                bus->mii_bus->read = cavium_mdiobus_read;
  97                bus->mii_bus->write = cavium_mdiobus_write;
  98
  99                err = of_mdiobus_register(bus->mii_bus, node);
 100                if (err)
 101                        dev_err(&pdev->dev, "of_mdiobus_register failed\n");
 102
 103                dev_info(&pdev->dev, "Added bus at %llx\n", r.start);
 104                if (i >= ARRAY_SIZE(nexus->buses))
 105                        break;
 106        }
 107        return 0;
 108
 109err_release_regions:
 110        pci_release_regions(pdev);
 111
 112err_disable_device:
 113        pci_set_drvdata(pdev, NULL);
 114        return err;
 115}
 116
 117static void thunder_mdiobus_pci_remove(struct pci_dev *pdev)
 118{
 119        int i;
 120        struct thunder_mdiobus_nexus *nexus = pci_get_drvdata(pdev);
 121
 122        for (i = 0; i < ARRAY_SIZE(nexus->buses); i++) {
 123                struct cavium_mdiobus *bus = nexus->buses[i];
 124
 125                if (!bus)
 126                        continue;
 127
 128                mdiobus_unregister(bus->mii_bus);
 129                oct_mdio_writeq(0, bus->register_base + SMI_EN);
 130        }
 131        pci_release_regions(pdev);
 132        pci_set_drvdata(pdev, NULL);
 133}
 134
 135static const struct pci_device_id thunder_mdiobus_id_table[] = {
 136        { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa02b) },
 137        { 0, } /* End of table. */
 138};
 139MODULE_DEVICE_TABLE(pci, thunder_mdiobus_id_table);
 140
 141static struct pci_driver thunder_mdiobus_driver = {
 142        .name = KBUILD_MODNAME,
 143        .id_table = thunder_mdiobus_id_table,
 144        .probe = thunder_mdiobus_pci_probe,
 145        .remove = thunder_mdiobus_pci_remove,
 146};
 147
 148module_pci_driver(thunder_mdiobus_driver);
 149
 150MODULE_DESCRIPTION("Cavium ThunderX MDIO bus driver");
 151MODULE_LICENSE("GPL v2");
 152