drivers/phy/freescale/phy-fsl-imx8mq-usb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Copyright (c) 2017 NXP. */
   3
   4 #include <linux/clk.h>
   5 #include <linux/io.h>
   6 #include <linux/module.h>
   7 #include <linux/phy/phy.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/regulator/consumer.h>
  10
  11 #define PHY_CTRL0                       0x0
  12 #define PHY_CTRL0_REF_SSP_EN            BIT(2)
  13
  14 #define PHY_CTRL1                       0x4
  15 #define PHY_CTRL1_RESET                 BIT(0)
  16 #define PHY_CTRL1_COMMONONN             BIT(1)
  17 #define PHY_CTRL1_ATERESET              BIT(3)
  18 #define PHY_CTRL1_VDATSRCENB0           BIT(19)
  19 #define PHY_CTRL1_VDATDETENB0           BIT(20)
  20
  21 #define PHY_CTRL2                       0x8
  22 #define PHY_CTRL2_TXENABLEN0            BIT(8)
  23
  24 struct imx8mq_usb_phy {
  25         struct phy *phy;
  26         struct clk *clk;
  27         void __iomem *base;
  28         struct regulator *vbus;
  29 };
  30
  31 static int imx8mq_usb_phy_init(struct phy *phy)
  32 {
  33         struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
  34         u32 value;
  35
  36         value = readl(imx_phy->base + PHY_CTRL1);
  37         value &= ~(PHY_CTRL1_VDATSRCENB0 | PHY_CTRL1_VDATDETENB0 |
  38                    PHY_CTRL1_COMMONONN);
  39         value |= PHY_CTRL1_RESET | PHY_CTRL1_ATERESET;
  40         writel(value, imx_phy->base + PHY_CTRL1);
  41
  42         value = readl(imx_phy->base + PHY_CTRL0);
  43         value |= PHY_CTRL0_REF_SSP_EN;
  44         writel(value, imx_phy->base + PHY_CTRL0);
  45
  46         value = readl(imx_phy->base + PHY_CTRL2);
  47         value |= PHY_CTRL2_TXENABLEN0;
  48         writel(value, imx_phy->base + PHY_CTRL2);
  49
  50         value = readl(imx_phy->base + PHY_CTRL1);
  51         value &= ~(PHY_CTRL1_RESET | PHY_CTRL1_ATERESET);
  52         writel(value, imx_phy->base + PHY_CTRL1);
  53
  54         return 0;
  55 }
  56
  57 static int imx8mq_phy_power_on(struct phy *phy)
  58 {
  59         struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
  60         int ret;
  61
  62         ret = regulator_enable(imx_phy->vbus);
  63         if (ret)
  64                 return ret;
  65
  66         return clk_prepare_enable(imx_phy->clk);
  67 }
  68
  69 static int imx8mq_phy_power_off(struct phy *phy)
  70 {
  71         struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
  72
  73         clk_disable_unprepare(imx_phy->clk);
  74         regulator_disable(imx_phy->vbus);
  75
  76         return 0;
  77 }
  78
  79 static struct phy_ops imx8mq_usb_phy_ops = {
  80         .init           = imx8mq_usb_phy_init,
  81         .power_on       = imx8mq_phy_power_on,
  82         .power_off      = imx8mq_phy_power_off,
  83         .owner          = THIS_MODULE,
  84 };
  85
  86 static int imx8mq_usb_phy_probe(struct platform_device *pdev)
  87 {
  88         struct phy_provider *phy_provider;
  89         struct device *dev = &pdev->dev;
  90         struct imx8mq_usb_phy *imx_phy;
  91         struct resource *res;
  92
  93         imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
  94         if (!imx_phy)
  95                 return -ENOMEM;
  96
  97         imx_phy->clk = devm_clk_get(dev, "phy");
  98         if (IS_ERR(imx_phy->clk)) {
  99                 dev_err(dev, "failed to get imx8mq usb phy clock\n");
 100                 return PTR_ERR(imx_phy->clk);
 101         }
 102
 103         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 104         imx_phy->base = devm_ioremap_resource(dev, res);
 105         if (IS_ERR(imx_phy->base))
 106                 return PTR_ERR(imx_phy->base);
 107
 108         imx_phy->phy = devm_phy_create(dev, NULL, &imx8mq_usb_phy_ops);
 109         if (IS_ERR(imx_phy->phy))
 110                 return PTR_ERR(imx_phy->phy);
 111
 112         imx_phy->vbus = devm_regulator_get(dev, "vbus");
 113         if (IS_ERR(imx_phy->vbus))
 114                 return PTR_ERR(imx_phy->vbus);
 115
 116         phy_set_drvdata(imx_phy->phy, imx_phy);
 117
 118         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 119
 120         return PTR_ERR_OR_ZERO(phy_provider);
 121 }
 122
 123 static const struct of_device_id imx8mq_usb_phy_of_match[] = {
 124         {.compatible = "fsl,imx8mq-usb-phy",},
 125         { },
 126 };
 127 MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
 128
 129 static struct platform_driver imx8mq_usb_phy_driver = {
 130         .probe  = imx8mq_usb_phy_probe,
 131         .driver = {
 132                 .name   = "imx8mq-usb-phy",
 133                 .of_match_table = imx8mq_usb_phy_of_match,
 134         }
 135 };
 136 module_platform_driver(imx8mq_usb_phy_driver);
 137
 138 MODULE_DESCRIPTION("FSL IMX8MQ USB PHY driver");
 139 MODULE_LICENSE("GPL");