Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2009-2016 Cavium, Inc.
 */
 
#include <linux/of_address.h>
#include <linux/of_mdio.h>
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/phy.h>
#include <linux/io.h>
#include <linux/acpi.h>
#include <linux/pci.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;
<------>}
<------>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");