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
  20 struct thunder_mdiobus_nexus {
  21         void __iomem *bar0;
  22         struct cavium_mdiobus *buses[4];
  23 };
  24
  25 static 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
 112 err_release_regions:
 113         pci_release_regions(pdev);
 114
 115 err_disable_device:
 116         pci_set_drvdata(pdev, NULL);
 117         return err;
 118 }
 119
 120 static 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
 138 static const struct pci_device_id thunder_mdiobus_id_table[] = {
 139         { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa02b) },
 140         { 0, } /* End of table. */
 141 };
 142 MODULE_DEVICE_TABLE(pci, thunder_mdiobus_id_table);
 143
 144 static 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
 151 module_pci_driver(thunder_mdiobus_driver);
 152
 153 MODULE_DESCRIPTION("Cavium ThunderX MDIO bus driver");
 154 MODULE_LICENSE("GPL");