1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright (C) 2016 Broadcom
3
4#include <linux/device.h>
5#include <linux/module.h>
6#include <linux/of_mdio.h>
7#include <linux/mdio.h>
8#include <linux/phy.h>
9#include <linux/phy/phy.h>
10
11#define BLK_ADDR_REG_OFFSET	0x1f
12#define PLL_AFE1_100MHZ_BLK	0x2100
13#define PLL_CLK_AMP_OFFSET	0x03
14#define PLL_CLK_AMP_2P05V	0x2b18
15
16static int ns2_pci_phy_init(struct phy *p)
17{
18	struct mdio_device *mdiodev = phy_get_drvdata(p);
19	int rc;
20
21	/* select the AFE 100MHz block page */
22	rc = mdiodev_write(mdiodev, BLK_ADDR_REG_OFFSET, PLL_AFE1_100MHZ_BLK);
23	if (rc)
24		goto err;
25
26	/* set the 100 MHz reference clock amplitude to 2.05 v */
27	rc = mdiodev_write(mdiodev, PLL_CLK_AMP_OFFSET, PLL_CLK_AMP_2P05V);
28	if (rc)
29		goto err;
30
31	return 0;
32
33err:
34	dev_err(&mdiodev->dev, "Error %d writing to phy\n", rc);
35	return rc;
36}
37
38static const struct phy_ops ns2_pci_phy_ops = {
39	.init = ns2_pci_phy_init,
40	.owner = THIS_MODULE,
41};
42
43static int ns2_pci_phy_probe(struct mdio_device *mdiodev)
44{
45	struct device *dev = &mdiodev->dev;
46	struct phy_provider *provider;
47	struct phy *phy;
48
49	phy = devm_phy_create(dev, dev->of_node, &ns2_pci_phy_ops);
50	if (IS_ERR(phy)) {
51		dev_err(dev, "failed to create Phy\n");
52		return PTR_ERR(phy);
53	}
54
55	phy_set_drvdata(phy, mdiodev);
56
57	provider = devm_of_phy_provider_register(&phy->dev,
58						 of_phy_simple_xlate);
59	if (IS_ERR(provider)) {
60		dev_err(dev, "failed to register Phy provider\n");
61		return PTR_ERR(provider);
62	}
63
64	dev_info(dev, "%s PHY registered\n", dev_name(dev));
65
66	return 0;
67}
68
69static const struct of_device_id ns2_pci_phy_of_match[] = {
70	{ .compatible = "brcm,ns2-pcie-phy", },
71	{ /* sentinel */ },
72};
73MODULE_DEVICE_TABLE(of, ns2_pci_phy_of_match);
74
75static struct mdio_driver ns2_pci_phy_driver = {
76	.mdiodrv = {
77		.driver = {
78			.name = "phy-bcm-ns2-pci",
79			.of_match_table = ns2_pci_phy_of_match,
80		},
81	},
82	.probe = ns2_pci_phy_probe,
83};
84mdio_module_driver(ns2_pci_phy_driver);
85
86MODULE_AUTHOR("Broadcom");
87MODULE_DESCRIPTION("Broadcom Northstar2 PCI Phy driver");
88MODULE_LICENSE("GPL v2");
89MODULE_ALIAS("platform:phy-bcm-ns2-pci");
90