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// 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 = (u64)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);
mdiobus_free(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");
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