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 
17 static 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 
30 static const struct phy_ops mmp3_hsic_phy_ops = {
31 	.init		= mmp3_hsic_phy_init,
32 	.owner		= THIS_MODULE,
33 };
34 
35 static const struct of_device_id mmp3_hsic_phy_of_match[] = {
36 	{ .compatible = "marvell,mmp3-hsic-phy", },
37 	{ },
38 };
39 MODULE_DEVICE_TABLE(of, mmp3_hsic_phy_of_match);
40 
41 static 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 
68 static 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 };
75 module_platform_driver(mmp3_hsic_phy_driver);
76 
77 MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
78 MODULE_DESCRIPTION("Marvell MMP3 USB HSIC PHY Driver");
79 MODULE_LICENSE("GPL");
80