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
  17 struct thunder_mdiobus_nexus {
  18         void __iomem *bar0;
  19         struct cavium_mdiobus *buses[4];
  20 };
  21
  22 static int thunder_mdiobus_pci_probe(struct pci_dev *pdev,
  23                                      const struct pci_device_id *ent)
  24 {
  25         struct device_node *node;
  26         struct thunder_mdiobus_nexus *nexus;
  27         int err;
  28         int i;
  29
  30         nexus = devm_kzalloc(&pdev->dev, sizeof(*nexus), GFP_KERNEL);
  31         if (!nexus)
  32                 return -ENOMEM;
  33
  34         pci_set_drvdata(pdev, nexus);
  35
  36         err = pcim_enable_device(pdev);
  37         if (err) {
  38                 dev_err(&pdev->dev, "Failed to enable PCI device\n");
  39                 pci_set_drvdata(pdev, NULL);
  40                 return err;
  41         }
  42
  43         err = pci_request_regions(pdev, KBUILD_MODNAME);
  44         if (err) {
  45                 dev_err(&pdev->dev, "pci_request_regions failed\n");
  46                 goto err_disable_device;
  47         }
  48
  49         nexus->bar0 = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
  50         if (!nexus->bar0) {
  51                 err = -ENOMEM;
  52                 goto err_release_regions;
  53         }
  54
  55         i = 0;
  56         device_for_each_child_node_scoped(&pdev->dev, fwn) {
  57                 struct resource r;
  58                 struct mii_bus *mii_bus;
  59                 struct cavium_mdiobus *bus;
  60                 union cvmx_smix_en smi_en;
  61
  62                 /* If it is not an OF node we cannot handle it yet, so
  63                  * exit the loop.
  64                  */
  65                 node = to_of_node(fwn);
  66                 if (!node)
  67                         break;
  68
  69                 err = of_address_to_resource(node, 0, &r);
  70                 if (err) {
  71                         dev_err(&pdev->dev,
  72                                 "Couldn't translate address for \"%pOFn\"\n",
  73                                 node);
  74                         break;
  75                 }
  76
  77                 mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
  78                 if (!mii_bus)
  79                         break;
  80                 bus = mii_bus->priv;
  81                 bus->mii_bus = mii_bus;
  82
  83                 nexus->buses[i] = bus;
  84                 i++;
  85
  86                 bus->register_base = nexus->bar0 +
  87                         r.start - pci_resource_start(pdev, 0);
  88
  89                 smi_en.u64 = 0;
  90                 smi_en.s.en = 1;
  91                 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
  92                 bus->mii_bus->name = KBUILD_MODNAME;
  93                 snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", r.start);
  94                 bus->mii_bus->parent = &pdev->dev;
  95                 bus->mii_bus->read = cavium_mdiobus_read_c22;
  96                 bus->mii_bus->write = cavium_mdiobus_write_c22;
  97                 bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
  98                 bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;
  99
 100                 err = of_mdiobus_register(bus->mii_bus, node);
 101                 if (err)
 102                         dev_err(&pdev->dev, "of_mdiobus_register failed\n");
 103
 104                 dev_info(&pdev->dev, "Added bus at %llx\n", r.start);
 105                 if (i >= ARRAY_SIZE(nexus->buses))
 106                         break;
 107         }
 108         return 0;
 109
 110 err_release_regions:
 111         pci_release_regions(pdev);
 112
 113 err_disable_device:
 114         pci_set_drvdata(pdev, NULL);
 115         return err;
 116 }
 117
 118 static void thunder_mdiobus_pci_remove(struct pci_dev *pdev)
 119 {
 120         int i;
 121         struct thunder_mdiobus_nexus *nexus = pci_get_drvdata(pdev);
 122
 123         for (i = 0; i < ARRAY_SIZE(nexus->buses); i++) {
 124                 struct cavium_mdiobus *bus = nexus->buses[i];
 125
 126                 if (!bus)
 127                         continue;
 128
 129                 mdiobus_unregister(bus->mii_bus);
 130                 oct_mdio_writeq(0, bus->register_base + SMI_EN);
 131         }
 132         pci_release_regions(pdev);
 133         pci_set_drvdata(pdev, NULL);
 134 }
 135
 136 static const struct pci_device_id thunder_mdiobus_id_table[] = {
 137         { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa02b) },
 138         { 0, } /* End of table. */
 139 };
 140 MODULE_DEVICE_TABLE(pci, thunder_mdiobus_id_table);
 141
 142 static struct pci_driver thunder_mdiobus_driver = {
 143         .name = KBUILD_MODNAME,
 144         .id_table = thunder_mdiobus_id_table,
 145         .probe = thunder_mdiobus_pci_probe,
 146         .remove = thunder_mdiobus_pci_remove,
 147 };
 148
 149 module_pci_driver(thunder_mdiobus_driver);
 150
 151 MODULE_DESCRIPTION("Cavium ThunderX MDIO bus driver");
 152 MODULE_LICENSE("GPL v2");