1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
4 */
5
6#include <linux/delay.h>
7#include <linux/io.h>
8#include <linux/mod_devicetable.h>
9#include <linux/module.h>
10#include <linux/phy/phy.h>
11#include <linux/platform_device.h>
12
13#define HSIC_CTRL	0x08
14#define HSIC_ENABLE	BIT(7)
15#define PLL_BYPASS	BIT(4)
16
17static int mmp3_hsic_phy_init(struct phy *phy)
18{
19	void __iomem *base = (void __iomem *)phy_get_drvdata(phy);
20	u32 hsic_ctrl;
21
22	hsic_ctrl = readl_relaxed(base + HSIC_CTRL);
23	hsic_ctrl |= HSIC_ENABLE;
24	hsic_ctrl |= PLL_BYPASS;
25	writel_relaxed(hsic_ctrl, base + HSIC_CTRL);
26
27	return 0;
28}
29
30static const struct phy_ops mmp3_hsic_phy_ops = {
31	.init		= mmp3_hsic_phy_init,
32	.owner		= THIS_MODULE,
33};
34
35static const struct of_device_id mmp3_hsic_phy_of_match[] = {
36	{ .compatible = "marvell,mmp3-hsic-phy", },
37	{ },
38};
39MODULE_DEVICE_TABLE(of, mmp3_hsic_phy_of_match);
40
41static int mmp3_hsic_phy_probe(struct platform_device *pdev)
42{
43	struct device *dev = &pdev->dev;
44	struct phy_provider *provider;
45	void __iomem *base;
46	struct phy *phy;
47
48	base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
49	if (IS_ERR(base))
50		return PTR_ERR(base);
51
52	phy = devm_phy_create(dev, NULL, &mmp3_hsic_phy_ops);
53	if (IS_ERR(phy)) {
54		dev_err(dev, "failed to create PHY\n");
55		return PTR_ERR(phy);
56	}
57
58	phy_set_drvdata(phy, (void *)base);
59	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
60	if (IS_ERR(provider)) {
61		dev_err(dev, "failed to register PHY provider\n");
62		return PTR_ERR(provider);
63	}
64
65	return 0;
66}
67
68static struct platform_driver mmp3_hsic_phy_driver = {
69	.probe		= mmp3_hsic_phy_probe,
70	.driver		= {
71		.name	= "mmp3-hsic-phy",
72		.of_match_table = mmp3_hsic_phy_of_match,
73	},
74};
75module_platform_driver(mmp3_hsic_phy_driver);
76
77MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
78MODULE_DESCRIPTION("Marvell MMP3 USB HSIC PHY Driver");
79MODULE_LICENSE("GPL");
80