diff options
Diffstat (limited to 'drivers/net/mdio/mdio-thunder.c')
| -rw-r--r-- | drivers/net/mdio/mdio-thunder.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/net/mdio/mdio-thunder.c b/drivers/net/mdio/mdio-thunder.c new file mode 100644 index 000000000..394b864aa --- /dev/null +++ b/drivers/net/mdio/mdio-thunder.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2009-2016 Cavium, Inc. + */ + +#include <linux/acpi.h> +#include <linux/gfp.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/of_mdio.h> +#include <linux/pci.h> +#include <linux/phy.h> + +#include "mdio-cavium.h" + +struct thunder_mdiobus_nexus { + void __iomem *bar0; + struct cavium_mdiobus *buses[4]; +}; + +static int thunder_mdiobus_pci_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + struct device_node *node; + struct fwnode_handle *fwn; + struct thunder_mdiobus_nexus *nexus; + int err; + int i; + + nexus = devm_kzalloc(&pdev->dev, sizeof(*nexus), GFP_KERNEL); + if (!nexus) + return -ENOMEM; + + pci_set_drvdata(pdev, nexus); + + err = pcim_enable_device(pdev); + if (err) { + dev_err(&pdev->dev, "Failed to enable PCI device\n"); + pci_set_drvdata(pdev, NULL); + return err; + } + + err = pci_request_regions(pdev, KBUILD_MODNAME); + if (err) { + dev_err(&pdev->dev, "pci_request_regions failed\n"); + goto err_disable_device; + } + + nexus->bar0 = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0)); + if (!nexus->bar0) { + err = -ENOMEM; + goto err_release_regions; + } + + i = 0; + device_for_each_child_node(&pdev->dev, fwn) { + struct resource r; + struct mii_bus *mii_bus; + struct cavium_mdiobus *bus; + union cvmx_smix_en smi_en; + + /* If it is not an OF node we cannot handle it yet, so + * exit the loop. + */ + node = to_of_node(fwn); + if (!node) + break; + + err = of_address_to_resource(node, 0, &r); + if (err) { + dev_err(&pdev->dev, + "Couldn't translate address for \"%pOFn\"\n", + node); + break; + } + + mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus)); + if (!mii_bus) + break; + bus = mii_bus->priv; + bus->mii_bus = mii_bus; + + nexus->buses[i] = bus; + i++; + + bus->register_base = nexus->bar0 + + r.start - pci_resource_start(pdev, 0); + + smi_en.u64 = 0; + smi_en.s.en = 1; + oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN); + bus->mii_bus->name = KBUILD_MODNAME; + snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", r.start); + bus->mii_bus->parent = &pdev->dev; + bus->mii_bus->read = cavium_mdiobus_read; + bus->mii_bus->write = cavium_mdiobus_write; + + err = of_mdiobus_register(bus->mii_bus, node); + if (err) + dev_err(&pdev->dev, "of_mdiobus_register failed\n"); + + dev_info(&pdev->dev, "Added bus at %llx\n", r.start); + if (i >= ARRAY_SIZE(nexus->buses)) + break; + } + fwnode_handle_put(fwn); + return 0; + +err_release_regions: + pci_release_regions(pdev); + +err_disable_device: + pci_set_drvdata(pdev, NULL); + return err; +} + +static void thunder_mdiobus_pci_remove(struct pci_dev *pdev) +{ + int i; + struct thunder_mdiobus_nexus *nexus = pci_get_drvdata(pdev); + + for (i = 0; i < ARRAY_SIZE(nexus->buses); i++) { + struct cavium_mdiobus *bus = nexus->buses[i]; + + if (!bus) + continue; + + mdiobus_unregister(bus->mii_bus); + oct_mdio_writeq(0, bus->register_base + SMI_EN); + } + pci_release_regions(pdev); + pci_set_drvdata(pdev, NULL); +} + +static const struct pci_device_id thunder_mdiobus_id_table[] = { + { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa02b) }, + { 0, } /* End of table. */ +}; +MODULE_DEVICE_TABLE(pci, thunder_mdiobus_id_table); + +static struct pci_driver thunder_mdiobus_driver = { + .name = KBUILD_MODNAME, + .id_table = thunder_mdiobus_id_table, + .probe = thunder_mdiobus_pci_probe, + .remove = thunder_mdiobus_pci_remove, +}; + +module_pci_driver(thunder_mdiobus_driver); + +MODULE_DESCRIPTION("Cavium ThunderX MDIO bus driver"); +MODULE_LICENSE("GPL v2"); |