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