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

   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) 2009-2016 Cavium, Inc.
   7 */
   8
   9#include <linux/of_address.h>
  10#include <linux/of_mdio.h>
  11#include <linux/module.h>
  12#include <linux/gfp.h>
  13#include <linux/phy.h>
  14#include <linux/io.h>
  15#include <linux/acpi.h>
  16#include <linux/pci.h>
  17
  18#include "mdio-cavium.h"
  19
  20struct thunder_mdiobus_nexus {
  21        void __iomem *bar0;
  22        struct cavium_mdiobus *buses[4];
  23};
  24
  25static int thunder_mdiobus_pci_probe(struct pci_dev *pdev,
  26                                     const struct pci_device_id *ent)
  27{
  28        struct device_node *node;
  29        struct fwnode_handle *fwn;
  30        struct thunder_mdiobus_nexus *nexus;
  31        int err;
  32        int i;
  33
  34        nexus = devm_kzalloc(&pdev->dev, sizeof(*nexus), GFP_KERNEL);
  35        if (!nexus)
  36                return -ENOMEM;
  37
  38        pci_set_drvdata(pdev, nexus);
  39
  40        err = pcim_enable_device(pdev);
  41        if (err) {
  42                dev_err(&pdev->dev, "Failed to enable PCI device\n");
  43                pci_set_drvdata(pdev, NULL);
  44                return err;
  45        }
  46
  47        err = pci_request_regions(pdev, KBUILD_MODNAME);
  48        if (err) {
  49                dev_err(&pdev->dev, "pci_request_regions failed\n");
  50                goto err_disable_device;
  51        }
  52
  53        nexus->bar0 = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
  54        if (!nexus->bar0) {
  55                err = -ENOMEM;
  56                goto err_release_regions;
  57        }
  58
  59        i = 0;
  60        device_for_each_child_node(&pdev->dev, fwn) {
  61                struct resource r;
  62                struct mii_bus *mii_bus;
  63                struct cavium_mdiobus *bus;
  64                union cvmx_smix_en smi_en;
  65
  66                /* If it is not an OF node we cannot handle it yet, so
  67                 * exit the loop.
  68                 */
  69                node = to_of_node(fwn);
  70                if (!node)
  71                        break;
  72
  73                err = of_address_to_resource(node, 0, &r);
  74                if (err) {
  75                        dev_err(&pdev->dev,
  76                                "Couldn't translate address for \"%s\"\n",
  77                                node->name);
  78                        break;
  79                }
  80
  81                mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
  82                if (!mii_bus)
  83                        break;
  84                bus = mii_bus->priv;
  85                bus->mii_bus = mii_bus;
  86
  87                nexus->buses[i] = bus;
  88                i++;
  89
  90                bus->register_base = (u64)nexus->bar0 +
  91                        r.start - pci_resource_start(pdev, 0);
  92
  93                smi_en.u64 = 0;
  94                smi_en.s.en = 1;
  95                oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
  96                bus->mii_bus->name = KBUILD_MODNAME;
  97                snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", r.start);
  98                bus->mii_bus->parent = &pdev->dev;
  99                bus->mii_bus->read = cavium_mdiobus_read;
 100                bus->mii_bus->write = cavium_mdiobus_write;
 101
 102                err = of_mdiobus_register(bus->mii_bus, node);
 103                if (err)
 104                        dev_err(&pdev->dev, "of_mdiobus_register failed\n");
 105
 106                dev_info(&pdev->dev, "Added bus at %llx\n", r.start);
 107                if (i >= ARRAY_SIZE(nexus->buses))
 108                        break;
 109        }
 110        return 0;
 111
 112err_release_regions:
 113        pci_release_regions(pdev);
 114
 115err_disable_device:
 116        pci_set_drvdata(pdev, NULL);
 117        return err;
 118}
 119
 120static void thunder_mdiobus_pci_remove(struct pci_dev *pdev)
 121{
 122        int i;
 123        struct thunder_mdiobus_nexus *nexus = pci_get_drvdata(pdev);
 124
 125        for (i = 0; i < ARRAY_SIZE(nexus->buses); i++) {
 126                struct cavium_mdiobus *bus = nexus->buses[i];
 127
 128                if (!bus)
 129                        continue;
 130
 131                mdiobus_unregister(bus->mii_bus);
 132                mdiobus_free(bus->mii_bus);
 133                oct_mdio_writeq(0, bus->register_base + SMI_EN);
 134        }
 135        pci_set_drvdata(pdev, NULL);
 136}
 137
 138static const struct pci_device_id thunder_mdiobus_id_table[] = {
 139        { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa02b) },
 140        { 0, } /* End of table. */
 141};
 142MODULE_DEVICE_TABLE(pci, thunder_mdiobus_id_table);
 143
 144static struct pci_driver thunder_mdiobus_driver = {
 145        .name = KBUILD_MODNAME,
 146        .id_table = thunder_mdiobus_id_table,
 147        .probe = thunder_mdiobus_pci_probe,
 148        .remove = thunder_mdiobus_pci_remove,
 149};
 150
 151module_pci_driver(thunder_mdiobus_driver);
 152
 153MODULE_DESCRIPTION("Cavium ThunderX MDIO bus driver");
 154MODULE_LICENSE("GPL");
 155