drivers/phy/marvell/phy-mmp3-hsic.c

   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");