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/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
  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
  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");