drivers/phy/starfive/phy-jh7110-usb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * StarFive JH7110 USB 2.0 PHY driver
   4  *
   5  * Copyright (C) 2023 StarFive Technology Co., Ltd.
   6  * Author: Minda Chen <[email protected]>
   7  */
   8
   9 #include <linux/bits.h>
  10 #include <linux/clk.h>
  11 #include <linux/err.h>
  12 #include <linux/io.h>
  13 #include <linux/module.h>
  14 #include <linux/phy/phy.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/usb/of.h>
  17
  18 #define USB_125M_CLK_RATE               125000000
  19 #define USB_LS_KEEPALIVE_OFF            0x4
  20 #define USB_LS_KEEPALIVE_ENABLE         BIT(4)
  21
  22 struct jh7110_usb2_phy {
  23         struct phy *phy;
  24         void __iomem *regs;
  25         struct clk *usb_125m_clk;
  26         struct clk *app_125m;
  27         enum phy_mode mode;
  28 };
  29
  30 static void usb2_set_ls_keepalive(struct jh7110_usb2_phy *phy, bool set)
  31 {
  32         unsigned int val;
  33
  34         /* Host mode enable the LS speed keep-alive signal */
  35         val = readl(phy->regs + USB_LS_KEEPALIVE_OFF);
  36         if (set)
  37                 val |= USB_LS_KEEPALIVE_ENABLE;
  38         else
  39                 val &= ~USB_LS_KEEPALIVE_ENABLE;
  40
  41         writel(val, phy->regs + USB_LS_KEEPALIVE_OFF);
  42 }
  43
  44 static int usb2_phy_set_mode(struct phy *_phy,
  45                              enum phy_mode mode, int submode)
  46 {
  47         struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
  48
  49         switch (mode) {
  50         case PHY_MODE_USB_HOST:
  51         case PHY_MODE_USB_DEVICE:
  52         case PHY_MODE_USB_OTG:
  53                 break;
  54         default:
  55                 return -EINVAL;
  56         }
  57
  58         if (mode != phy->mode) {
  59                 dev_dbg(&_phy->dev, "Changing phy to %d\n", mode);
  60                 phy->mode = mode;
  61                 usb2_set_ls_keepalive(phy, (mode != PHY_MODE_USB_DEVICE));
  62         }
  63
  64         return 0;
  65 }
  66
  67 static int jh7110_usb2_phy_init(struct phy *_phy)
  68 {
  69         struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
  70         int ret;
  71
  72         ret = clk_set_rate(phy->usb_125m_clk, USB_125M_CLK_RATE);
  73         if (ret)
  74                 return ret;
  75
  76         ret = clk_prepare_enable(phy->app_125m);
  77         if (ret)
  78                 return ret;
  79
  80         return 0;
  81 }
  82
  83 static int jh7110_usb2_phy_exit(struct phy *_phy)
  84 {
  85         struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
  86
  87         clk_disable_unprepare(phy->app_125m);
  88
  89         return 0;
  90 }
  91
  92 static const struct phy_ops jh7110_usb2_phy_ops = {
  93         .init           = jh7110_usb2_phy_init,
  94         .exit           = jh7110_usb2_phy_exit,
  95         .set_mode       = usb2_phy_set_mode,
  96         .owner          = THIS_MODULE,
  97 };
  98
  99 static int jh7110_usb_phy_probe(struct platform_device *pdev)
 100 {
 101         struct jh7110_usb2_phy *phy;
 102         struct device *dev = &pdev->dev;
 103         struct phy_provider *phy_provider;
 104
 105         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 106         if (!phy)
 107                 return -ENOMEM;
 108
 109         phy->usb_125m_clk = devm_clk_get(dev, "125m");
 110         if (IS_ERR(phy->usb_125m_clk))
 111                 return dev_err_probe(dev, PTR_ERR(phy->usb_125m_clk),
 112                         "Failed to get 125m clock\n");
 113
 114         phy->app_125m = devm_clk_get(dev, "app_125m");
 115         if (IS_ERR(phy->app_125m))
 116                 return dev_err_probe(dev, PTR_ERR(phy->app_125m),
 117                         "Failed to get app 125m clock\n");
 118
 119         phy->regs = devm_platform_ioremap_resource(pdev, 0);
 120         if (IS_ERR(phy->regs))
 121                 return dev_err_probe(dev, PTR_ERR(phy->regs),
 122                         "Failed to map phy base\n");
 123
 124         phy->phy = devm_phy_create(dev, NULL, &jh7110_usb2_phy_ops);
 125         if (IS_ERR(phy->phy))
 126                 return dev_err_probe(dev, PTR_ERR(phy->phy),
 127                         "Failed to create phy\n");
 128
 129         phy_set_drvdata(phy->phy, phy);
 130         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 131
 132         return PTR_ERR_OR_ZERO(phy_provider);
 133 }
 134
 135 static const struct of_device_id jh7110_usb_phy_of_match[] = {
 136         { .compatible = "starfive,jh7110-usb-phy" },
 137         { /* sentinel */ },
 138 };
 139 MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match);
 140
 141 static struct platform_driver jh7110_usb_phy_driver = {
 142         .probe  = jh7110_usb_phy_probe,
 143         .driver = {
 144                 .of_match_table = jh7110_usb_phy_of_match,
 145                 .name  = "jh7110-usb-phy",
 146         }
 147 };
 148 module_platform_driver(jh7110_usb_phy_driver);
 149
 150 MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver");
 151 MODULE_AUTHOR("Minda Chen <[email protected]>");
 152 MODULE_LICENSE("GPL");