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
mmp3_hsic_phy_init(struct phy * phy)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
mmp3_hsic_phy_probe(struct platform_device * pdev)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