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
mmp3_hsic_phy_init(struct phy * phy)16 static 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
29 static const struct phy_ops mmp3_hsic_phy_ops = {
30 .init = mmp3_hsic_phy_init,
31 .owner = THIS_MODULE,
32 };
33
34 static const struct of_device_id mmp3_hsic_phy_of_match[] = {
35 { .compatible = "marvell,mmp3-hsic-phy", },
36 { },
37 };
38 MODULE_DEVICE_TABLE(of, mmp3_hsic_phy_of_match);
39
mmp3_hsic_phy_probe(struct platform_device * pdev)40 static int mmp3_hsic_phy_probe(struct platform_device *pdev)
41 {
42 struct device *dev = &pdev->dev;
43 struct phy_provider *provider;
44 struct resource *resource;
45 void __iomem *base;
46 struct phy *phy;
47
48 resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
49 base = devm_ioremap_resource(dev, resource);
50 if (IS_ERR(base)) {
51 dev_err(dev, "failed to remap PHY regs\n");
52 return PTR_ERR(base);
53 }
54
55 phy = devm_phy_create(dev, NULL, &mmp3_hsic_phy_ops);
56 if (IS_ERR(phy)) {
57 dev_err(dev, "failed to create PHY\n");
58 return PTR_ERR(phy);
59 }
60
61 phy_set_drvdata(phy, (void *)base);
62 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
63 if (IS_ERR(provider)) {
64 dev_err(dev, "failed to register PHY provider\n");
65 return PTR_ERR(provider);
66 }
67
68 return 0;
69 }
70
71 static struct platform_driver mmp3_hsic_phy_driver = {
72 .probe = mmp3_hsic_phy_probe,
73 .driver = {
74 .name = "mmp3-hsic-phy",
75 .of_match_table = mmp3_hsic_phy_of_match,
76 },
77 };
78 module_platform_driver(mmp3_hsic_phy_driver);
79
80 MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
81 MODULE_DESCRIPTION("Marvell MMP3 USB HSIC PHY Driver");
82 MODULE_LICENSE("GPL");
83