drivers/phy/hisilicon/phy-hi6220-usb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2015 Linaro Ltd.
   4  * Copyright (c) 2015 Hisilicon Limited.
   5  */
   6
   7 #include <linux/mfd/syscon.h>
   8 #include <linux/module.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/phy/phy.h>
  11 #include <linux/regmap.h>
  12
  13 #define SC_PERIPH_CTRL4                 0x00c
  14
  15 #define CTRL4_PICO_SIDDQ                BIT(6)
  16 #define CTRL4_PICO_OGDISABLE            BIT(8)
  17 #define CTRL4_PICO_VBUSVLDEXT           BIT(10)
  18 #define CTRL4_PICO_VBUSVLDEXTSEL        BIT(11)
  19 #define CTRL4_OTG_PHY_SEL               BIT(21)
  20
  21 #define SC_PERIPH_CTRL5                 0x010
  22
  23 #define CTRL5_USBOTG_RES_SEL            BIT(3)
  24 #define CTRL5_PICOPHY_ACAENB            BIT(4)
  25 #define CTRL5_PICOPHY_BC_MODE           BIT(5)
  26 #define CTRL5_PICOPHY_CHRGSEL           BIT(6)
  27 #define CTRL5_PICOPHY_VDATSRCEND        BIT(7)
  28 #define CTRL5_PICOPHY_VDATDETENB        BIT(8)
  29 #define CTRL5_PICOPHY_DCDENB            BIT(9)
  30 #define CTRL5_PICOPHY_IDDIG             BIT(10)
  31
  32 #define SC_PERIPH_CTRL8                 0x018
  33 #define SC_PERIPH_RSTEN0                0x300
  34 #define SC_PERIPH_RSTDIS0               0x304
  35
  36 #define RST0_USBOTG_BUS                 BIT(4)
  37 #define RST0_POR_PICOPHY                BIT(5)
  38 #define RST0_USBOTG                     BIT(6)
  39 #define RST0_USBOTG_32K                 BIT(7)
  40
  41 #define EYE_PATTERN_PARA                0x7053348c
  42
  43 struct hi6220_priv {
  44         struct regmap *reg;
  45         struct device *dev;
  46 };
  47
  48 static void hi6220_phy_init(struct hi6220_priv *priv)
  49 {
  50         struct regmap *reg = priv->reg;
  51         u32 val, mask;
  52
  53         val = RST0_USBOTG_BUS | RST0_POR_PICOPHY |
  54               RST0_USBOTG | RST0_USBOTG_32K;
  55         mask = val;
  56         regmap_update_bits(reg, SC_PERIPH_RSTEN0, mask, val);
  57         regmap_update_bits(reg, SC_PERIPH_RSTDIS0, mask, val);
  58 }
  59
  60 static int hi6220_phy_setup(struct hi6220_priv *priv, bool on)
  61 {
  62         struct regmap *reg = priv->reg;
  63         u32 val, mask;
  64         int ret;
  65
  66         if (on) {
  67                 val = CTRL5_USBOTG_RES_SEL | CTRL5_PICOPHY_ACAENB;
  68                 mask = val | CTRL5_PICOPHY_BC_MODE;
  69                 ret = regmap_update_bits(reg, SC_PERIPH_CTRL5, mask, val);
  70                 if (ret)
  71                         goto out;
  72
  73                 val =  CTRL4_PICO_VBUSVLDEXT | CTRL4_PICO_VBUSVLDEXTSEL |
  74                        CTRL4_OTG_PHY_SEL;
  75                 mask = val | CTRL4_PICO_SIDDQ | CTRL4_PICO_OGDISABLE;
  76                 ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
  77                 if (ret)
  78                         goto out;
  79
  80                 ret = regmap_write(reg, SC_PERIPH_CTRL8, EYE_PATTERN_PARA);
  81                 if (ret)
  82                         goto out;
  83         } else {
  84                 val = CTRL4_PICO_SIDDQ;
  85                 mask = val;
  86                 ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
  87                 if (ret)
  88                         goto out;
  89         }
  90
  91         return 0;
  92 out:
  93         dev_err(priv->dev, "failed to setup phy ret: %d\n", ret);
  94         return ret;
  95 }
  96
  97 static int hi6220_phy_start(struct phy *phy)
  98 {
  99         struct hi6220_priv *priv = phy_get_drvdata(phy);
 100
 101         return hi6220_phy_setup(priv, true);
 102 }
 103
 104 static int hi6220_phy_exit(struct phy *phy)
 105 {
 106         struct hi6220_priv *priv = phy_get_drvdata(phy);
 107
 108         return hi6220_phy_setup(priv, false);
 109 }
 110
 111 static const struct phy_ops hi6220_phy_ops = {
 112         .init           = hi6220_phy_start,
 113         .exit           = hi6220_phy_exit,
 114         .owner          = THIS_MODULE,
 115 };
 116
 117 static int hi6220_phy_probe(struct platform_device *pdev)
 118 {
 119         struct phy_provider *phy_provider;
 120         struct device *dev = &pdev->dev;
 121         struct phy *phy;
 122         struct hi6220_priv *priv;
 123
 124         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 125         if (!priv)
 126                 return -ENOMEM;
 127
 128         priv->dev = dev;
 129         priv->reg = syscon_regmap_lookup_by_phandle(dev->of_node,
 130                                         "hisilicon,peripheral-syscon");
 131         if (IS_ERR(priv->reg)) {
 132                 dev_err(dev, "no hisilicon,peripheral-syscon\n");
 133                 return PTR_ERR(priv->reg);
 134         }
 135
 136         hi6220_phy_init(priv);
 137
 138         phy = devm_phy_create(dev, NULL, &hi6220_phy_ops);
 139         if (IS_ERR(phy))
 140                 return PTR_ERR(phy);
 141
 142         phy_set_drvdata(phy, priv);
 143         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 144         return PTR_ERR_OR_ZERO(phy_provider);
 145 }
 146
 147 static const struct of_device_id hi6220_phy_of_match[] = {
 148         {.compatible = "hisilicon,hi6220-usb-phy",},
 149         { },
 150 };
 151 MODULE_DEVICE_TABLE(of, hi6220_phy_of_match);
 152
 153 static struct platform_driver hi6220_phy_driver = {
 154         .probe  = hi6220_phy_probe,
 155         .driver = {
 156                 .name   = "hi6220-usb-phy",
 157                 .of_match_table = hi6220_phy_of_match,
 158         }
 159 };
 160 module_platform_driver(hi6220_phy_driver);
 161
 162 MODULE_DESCRIPTION("HISILICON HI6220 USB PHY driver");
 163 MODULE_ALIAS("platform:hi6220-usb-phy");
 164 MODULE_LICENSE("GPL");