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