1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2009-2016 Cavium, Inc.
4 */
5
6#include <linux/acpi.h>
7#include <linux/gfp.h>
8#include <linux/io.h>
9#include <linux/module.h>
10#include <linux/of_address.h>
11#include <linux/of_mdio.h>
12#include <linux/pci.h>
13#include <linux/phy.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 thunder_mdiobus_nexus *nexus;
27 int err;
28 int i;
29
30 nexus = devm_kzalloc(dev: &pdev->dev, size: sizeof(*nexus), GFP_KERNEL);
31 if (!nexus)
32 return -ENOMEM;
33
34 pci_set_drvdata(pdev, data: nexus);
35
36 err = pcim_enable_device(pdev);
37 if (err) {
38 dev_err(&pdev->dev, "Failed to enable PCI device\n");
39 pci_set_drvdata(pdev, NULL);
40 return err;
41 }
42
43 err = pcim_request_all_regions(pdev, KBUILD_MODNAME);
44 if (err) {
45 dev_err(&pdev->dev, "pcim_request_all_regions failed\n");
46 goto err_disable_device;
47 }
48
49 nexus->bar0 = pcim_iomap(pdev, bar: 0, pci_resource_len(pdev, 0));
50 if (!nexus->bar0) {
51 err = -ENOMEM;
52 goto err_disable_device;
53 }
54
55 i = 0;
56 device_for_each_child_node_scoped(&pdev->dev, fwn) {
57 struct resource r;
58 struct mii_bus *mii_bus;
59 struct cavium_mdiobus *bus;
60 union cvmx_smix_en smi_en;
61
62 /* If it is not an OF node we cannot handle it yet, so
63 * exit the loop.
64 */
65 node = to_of_node(fwn);
66 if (!node)
67 break;
68
69 err = of_address_to_resource(dev: node, index: 0, r: &r);
70 if (err) {
71 dev_err(&pdev->dev,
72 "Couldn't translate address for \"%pOFn\"\n",
73 node);
74 break;
75 }
76
77 mii_bus = devm_mdiobus_alloc_size(dev: &pdev->dev, sizeof_priv: sizeof(*bus));
78 if (!mii_bus)
79 break;
80 bus = mii_bus->priv;
81 bus->mii_bus = mii_bus;
82
83 nexus->buses[i] = bus;
84 i++;
85
86 bus->register_base = nexus->bar0 +
87 r.start - pci_resource_start(pdev, 0);
88
89 smi_en.u64 = 0;
90 smi_en.s.en = 1;
91 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
92 bus->mii_bus->name = KBUILD_MODNAME;
93 snprintf(buf: bus->mii_bus->id, MII_BUS_ID_SIZE, fmt: "%llx", r.start);
94 bus->mii_bus->parent = &pdev->dev;
95 bus->mii_bus->read = cavium_mdiobus_read_c22;
96 bus->mii_bus->write = cavium_mdiobus_write_c22;
97 bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
98 bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;
99
100 err = of_mdiobus_register(mdio: bus->mii_bus, np: node);
101 if (err)
102 dev_err(&pdev->dev, "of_mdiobus_register failed\n");
103
104 dev_info(&pdev->dev, "Added bus at %llx\n", r.start);
105 if (i >= ARRAY_SIZE(nexus->buses))
106 break;
107 }
108 return 0;
109
110err_disable_device:
111 pci_set_drvdata(pdev, NULL);
112 return err;
113}
114
115static void thunder_mdiobus_pci_remove(struct pci_dev *pdev)
116{
117 int i;
118 struct thunder_mdiobus_nexus *nexus = pci_get_drvdata(pdev);
119
120 for (i = 0; i < ARRAY_SIZE(nexus->buses); i++) {
121 struct cavium_mdiobus *bus = nexus->buses[i];
122
123 if (!bus)
124 continue;
125
126 mdiobus_unregister(bus: bus->mii_bus);
127 oct_mdio_writeq(0, bus->register_base + SMI_EN);
128 }
129 pci_set_drvdata(pdev, NULL);
130}
131
132static const struct pci_device_id thunder_mdiobus_id_table[] = {
133 { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa02b) },
134 { 0, } /* End of table. */
135};
136MODULE_DEVICE_TABLE(pci, thunder_mdiobus_id_table);
137
138static struct pci_driver thunder_mdiobus_driver = {
139 .name = KBUILD_MODNAME,
140 .id_table = thunder_mdiobus_id_table,
141 .probe = thunder_mdiobus_pci_probe,
142 .remove = thunder_mdiobus_pci_remove,
143};
144
145module_pci_driver(thunder_mdiobus_driver);
146
147MODULE_DESCRIPTION("Cavium ThunderX MDIO bus driver");
148MODULE_LICENSE("GPL v2");
149

source code of linux/drivers/net/mdio/mdio-thunder.c