drivers/net/phy/mdio-thunder.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2009-2016 Cavium, Inc.
   4  */
   5
   6 #include <linux/of_address.h>
   7 #include <linux/of_mdio.h>
   8 #include <linux/module.h>
   9 #include <linux/gfp.h>
  10 #include <linux/phy.h>
  11 #include <linux/io.h>
  12 #include <linux/acpi.h>
  13 #include <linux/pci.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 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 = (u64)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
 109 err_release_regions:
 110         pci_release_regions(pdev);
 111
 112 err_disable_device:
 113         pci_set_drvdata(pdev, NULL);
 114         return err;
 115 }
 116
 117 static 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                 mdiobus_free(bus->mii_bus);
 130                 oct_mdio_writeq(0, bus->register_base + SMI_EN);
 131         }
 132         pci_set_drvdata(pdev, NULL);
 133 }
 134
 135 static const struct pci_device_id thunder_mdiobus_id_table[] = {
 136         { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa02b) },
 137         { 0, } /* End of table. */
 138 };
 139 MODULE_DEVICE_TABLE(pci, thunder_mdiobus_id_table);
 140
 141 static 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
 148 module_pci_driver(thunder_mdiobus_driver);
 149
 150 MODULE_DESCRIPTION("Cavium ThunderX MDIO bus driver");
 151 MODULE_LICENSE("GPL v2");