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
 17struct thunder_mdiobus_nexus {
 18	void __iomem *bar0;
 19	struct cavium_mdiobus *buses[4];
 20};
 21
 22static 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 = 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
109err_release_regions:
110	pci_release_regions(pdev);
111
112err_disable_device:
113	pci_set_drvdata(pdev, NULL);
114	return err;
115}
116
117static 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_release_regions(pdev);
133	pci_set_drvdata(pdev, NULL);
134}
135
136static const struct pci_device_id thunder_mdiobus_id_table[] = {
137	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa02b) },
138	{ 0, } /* End of table. */
139};
140MODULE_DEVICE_TABLE(pci, thunder_mdiobus_id_table);
141
142static struct pci_driver thunder_mdiobus_driver = {
143	.name = KBUILD_MODNAME,
144	.id_table = thunder_mdiobus_id_table,
145	.probe = thunder_mdiobus_pci_probe,
146	.remove = thunder_mdiobus_pci_remove,
147};
148
149module_pci_driver(thunder_mdiobus_driver);
150
151MODULE_DESCRIPTION("Cavium ThunderX MDIO bus driver");
152MODULE_LICENSE("GPL v2");