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 <minda.chen@starfivetech.com>
   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/mfd/syscon.h>
  14 #include <linux/module.h>
  15 #include <linux/phy/phy.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/regmap.h>
  18 #include <linux/usb/of.h>
  19
  20 #define USB_125M_CLK_RATE               125000000
  21 #define USB_LS_KEEPALIVE_OFF            0x4
  22 #define USB_LS_KEEPALIVE_ENABLE         BIT(4)
  23
  24 #define USB_PDRSTN_SPLIT                BIT(17)
  25 #define SYSCON_USB_SPLIT_OFFSET         0x18
  26
  27 struct jh7110_usb2_phy {
  28         struct phy *phy;
  29         void __iomem *regs;
  30         struct regmap *sys_syscon;
  31         struct clk *usb_125m_clk;
  32         struct clk *app_125m;
  33         enum phy_mode mode;
  34 };
  35
  36 static void usb2_set_ls_keepalive(struct jh7110_usb2_phy *phy, bool set)
  37 {
  38         unsigned int val;
  39
  40         /* Host mode enable the LS speed keep-alive signal */
  41         val = readl(phy->regs + USB_LS_KEEPALIVE_OFF);
  42         if (set)
  43                 val |= USB_LS_KEEPALIVE_ENABLE;
  44         else
  45                 val &= ~USB_LS_KEEPALIVE_ENABLE;
  46
  47         writel(val, phy->regs + USB_LS_KEEPALIVE_OFF);
  48 }
  49
  50 static int usb2_phy_set_mode(struct phy *_phy,
  51                              enum phy_mode mode, int submode)
  52 {
  53         struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
  54
  55         switch (mode) {
  56         case PHY_MODE_USB_HOST:
  57         case PHY_MODE_USB_DEVICE:
  58         case PHY_MODE_USB_OTG:
  59                 break;
  60         default:
  61                 return -EINVAL;
  62         }
  63
  64         if (mode != phy->mode) {
  65                 dev_dbg(&_phy->dev, "Changing phy to %d\n", mode);
  66                 phy->mode = mode;
  67                 usb2_set_ls_keepalive(phy, (mode != PHY_MODE_USB_DEVICE));
  68         }
  69
  70         /* Connect usb 2.0 phy mode */
  71         regmap_update_bits(phy->sys_syscon, SYSCON_USB_SPLIT_OFFSET,
  72                            USB_PDRSTN_SPLIT, USB_PDRSTN_SPLIT);
  73
  74         return 0;
  75 }
  76
  77 static int jh7110_usb2_phy_init(struct phy *_phy)
  78 {
  79         struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
  80         int ret;
  81
  82         ret = clk_set_rate(phy->usb_125m_clk, USB_125M_CLK_RATE);
  83         if (ret)
  84                 return ret;
  85
  86         ret = clk_prepare_enable(phy->app_125m);
  87         if (ret)
  88                 return ret;
  89
  90         return 0;
  91 }
  92
  93 static int jh7110_usb2_phy_exit(struct phy *_phy)
  94 {
  95         struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
  96
  97         clk_disable_unprepare(phy->app_125m);
  98
  99         return 0;
 100 }
 101
 102 static const struct phy_ops jh7110_usb2_phy_ops = {
 103         .init           = jh7110_usb2_phy_init,
 104         .exit           = jh7110_usb2_phy_exit,
 105         .set_mode       = usb2_phy_set_mode,
 106         .owner          = THIS_MODULE,
 107 };
 108
 109 static int jh7110_usb_phy_probe(struct platform_device *pdev)
 110 {
 111         struct jh7110_usb2_phy *phy;
 112         struct device *dev = &pdev->dev;
 113         struct phy_provider *phy_provider;
 114
 115         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 116         if (!phy)
 117                 return -ENOMEM;
 118
 119         phy->usb_125m_clk = devm_clk_get(dev, "125m");
 120         if (IS_ERR(phy->usb_125m_clk))
 121                 return dev_err_probe(dev, PTR_ERR(phy->usb_125m_clk),
 122                         "Failed to get 125m clock\n");
 123
 124         phy->app_125m = devm_clk_get(dev, "app_125m");
 125         if (IS_ERR(phy->app_125m))
 126                 return dev_err_probe(dev, PTR_ERR(phy->app_125m),
 127                         "Failed to get app 125m clock\n");
 128
 129         phy->regs = devm_platform_ioremap_resource(pdev, 0);
 130         if (IS_ERR(phy->regs))
 131                 return dev_err_probe(dev, PTR_ERR(phy->regs),
 132                         "Failed to map phy base\n");
 133
 134         phy->phy = devm_phy_create(dev, NULL, &jh7110_usb2_phy_ops);
 135         if (IS_ERR(phy->phy))
 136                 return dev_err_probe(dev, PTR_ERR(phy->phy),
 137                         "Failed to create phy\n");
 138
 139         phy_set_drvdata(phy->phy, phy);
 140         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 141
 142         phy->sys_syscon =
 143                 syscon_regmap_lookup_by_compatible("starfive,jh7110-sys-syscon");
 144         if (IS_ERR(phy->sys_syscon))
 145                 return dev_err_probe(dev, PTR_ERR(phy->sys_syscon),
 146                                      "Failed to get sys-syscon\n");
 147
 148         return PTR_ERR_OR_ZERO(phy_provider);
 149 }
 150
 151 static const struct of_device_id jh7110_usb_phy_of_match[] = {
 152         { .compatible = "starfive,jh7110-usb-phy" },
 153         { /* sentinel */ },
 154 };
 155 MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match);
 156
 157 static struct platform_driver jh7110_usb_phy_driver = {
 158         .probe  = jh7110_usb_phy_probe,
 159         .driver = {
 160                 .of_match_table = jh7110_usb_phy_of_match,
 161                 .name  = "jh7110-usb-phy",
 162         }
 163 };
 164 module_platform_driver(jh7110_usb_phy_driver);
 165
 166 MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver");
 167 MODULE_AUTHOR("Minda Chen <minda.chen@starfivetech.com>");
 168 MODULE_LICENSE("GPL");