1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2009-2015 Cavium, Inc.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/gfp.h>
7*4882a593Smuzhiyun #include <linux/io.h>
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/of_address.h>
10*4882a593Smuzhiyun #include <linux/of_mdio.h>
11*4882a593Smuzhiyun #include <linux/phy.h>
12*4882a593Smuzhiyun #include <linux/platform_device.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "mdio-cavium.h"
15*4882a593Smuzhiyun
octeon_mdiobus_probe(struct platform_device * pdev)16*4882a593Smuzhiyun static int octeon_mdiobus_probe(struct platform_device *pdev)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun struct cavium_mdiobus *bus;
19*4882a593Smuzhiyun struct mii_bus *mii_bus;
20*4882a593Smuzhiyun struct resource *res_mem;
21*4882a593Smuzhiyun resource_size_t mdio_phys;
22*4882a593Smuzhiyun resource_size_t regsize;
23*4882a593Smuzhiyun union cvmx_smix_en smi_en;
24*4882a593Smuzhiyun int err = -ENOENT;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
27*4882a593Smuzhiyun if (!mii_bus)
28*4882a593Smuzhiyun return -ENOMEM;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
31*4882a593Smuzhiyun if (res_mem == NULL) {
32*4882a593Smuzhiyun dev_err(&pdev->dev, "found no memory resource\n");
33*4882a593Smuzhiyun return -ENXIO;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun bus = mii_bus->priv;
37*4882a593Smuzhiyun bus->mii_bus = mii_bus;
38*4882a593Smuzhiyun mdio_phys = res_mem->start;
39*4882a593Smuzhiyun regsize = resource_size(res_mem);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
42*4882a593Smuzhiyun res_mem->name)) {
43*4882a593Smuzhiyun dev_err(&pdev->dev, "request_mem_region failed\n");
44*4882a593Smuzhiyun return -ENXIO;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun bus->register_base = devm_ioremap(&pdev->dev, mdio_phys, regsize);
48*4882a593Smuzhiyun if (!bus->register_base) {
49*4882a593Smuzhiyun dev_err(&pdev->dev, "dev_ioremap failed\n");
50*4882a593Smuzhiyun return -ENOMEM;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun smi_en.u64 = 0;
54*4882a593Smuzhiyun smi_en.s.en = 1;
55*4882a593Smuzhiyun oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun bus->mii_bus->name = KBUILD_MODNAME;
58*4882a593Smuzhiyun snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%px", bus->register_base);
59*4882a593Smuzhiyun bus->mii_bus->parent = &pdev->dev;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun bus->mii_bus->read = cavium_mdiobus_read;
62*4882a593Smuzhiyun bus->mii_bus->write = cavium_mdiobus_write;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun platform_set_drvdata(pdev, bus);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
67*4882a593Smuzhiyun if (err)
68*4882a593Smuzhiyun goto fail_register;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun dev_info(&pdev->dev, "Probed\n");
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun return 0;
73*4882a593Smuzhiyun fail_register:
74*4882a593Smuzhiyun smi_en.u64 = 0;
75*4882a593Smuzhiyun oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
76*4882a593Smuzhiyun return err;
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
octeon_mdiobus_remove(struct platform_device * pdev)79*4882a593Smuzhiyun static int octeon_mdiobus_remove(struct platform_device *pdev)
80*4882a593Smuzhiyun {
81*4882a593Smuzhiyun struct cavium_mdiobus *bus;
82*4882a593Smuzhiyun union cvmx_smix_en smi_en;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun bus = platform_get_drvdata(pdev);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun mdiobus_unregister(bus->mii_bus);
87*4882a593Smuzhiyun smi_en.u64 = 0;
88*4882a593Smuzhiyun oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
89*4882a593Smuzhiyun return 0;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun static const struct of_device_id octeon_mdiobus_match[] = {
93*4882a593Smuzhiyun {
94*4882a593Smuzhiyun .compatible = "cavium,octeon-3860-mdio",
95*4882a593Smuzhiyun },
96*4882a593Smuzhiyun {},
97*4882a593Smuzhiyun };
98*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun static struct platform_driver octeon_mdiobus_driver = {
101*4882a593Smuzhiyun .driver = {
102*4882a593Smuzhiyun .name = KBUILD_MODNAME,
103*4882a593Smuzhiyun .of_match_table = octeon_mdiobus_match,
104*4882a593Smuzhiyun },
105*4882a593Smuzhiyun .probe = octeon_mdiobus_probe,
106*4882a593Smuzhiyun .remove = octeon_mdiobus_remove,
107*4882a593Smuzhiyun };
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun module_platform_driver(octeon_mdiobus_driver);
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
112*4882a593Smuzhiyun MODULE_AUTHOR("David Daney");
113*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
114