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