tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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");