drivers/phy/phy-hi6220-usb.c

   1 /*
   2  * Copyright (c) 2015 Linaro Ltd.
   3  * Copyright (c) 2015 Hisilicon Limited.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/mfd/syscon.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/phy/phy.h>
  15 #include <linux/regmap.h>
  16
  17 #define SC_PERIPH_CTRL4                 0x00c
  18
  19 #define CTRL4_PICO_SIDDQ                BIT(6)
  20 #define CTRL4_PICO_OGDISABLE            BIT(8)
  21 #define CTRL4_PICO_VBUSVLDEXT           BIT(10)
  22 #define CTRL4_PICO_VBUSVLDEXTSEL        BIT(11)
  23 #define CTRL4_OTG_PHY_SEL               BIT(21)
  24
  25 #define SC_PERIPH_CTRL5                 0x010
  26
  27 #define CTRL5_USBOTG_RES_SEL            BIT(3)
  28 #define CTRL5_PICOPHY_ACAENB            BIT(4)
  29 #define CTRL5_PICOPHY_BC_MODE           BIT(5)
  30 #define CTRL5_PICOPHY_CHRGSEL           BIT(6)
  31 #define CTRL5_PICOPHY_VDATSRCEND        BIT(7)
  32 #define CTRL5_PICOPHY_VDATDETENB        BIT(8)
  33 #define CTRL5_PICOPHY_DCDENB            BIT(9)
  34 #define CTRL5_PICOPHY_IDDIG             BIT(10)
  35
  36 #define SC_PERIPH_CTRL8                 0x018
  37 #define SC_PERIPH_RSTEN0                0x300
  38 #define SC_PERIPH_RSTDIS0               0x304
  39
  40 #define RST0_USBOTG_BUS                 BIT(4)
  41 #define RST0_POR_PICOPHY                BIT(5)
  42 #define RST0_USBOTG                     BIT(6)
  43 #define RST0_USBOTG_32K                 BIT(7)
  44
  45 #define EYE_PATTERN_PARA                0x7053348c
  46
  47 struct hi6220_priv {
  48         struct regmap *reg;
  49         struct device *dev;
  50 };
  51
  52 static void hi6220_phy_init(struct hi6220_priv *priv)
  53 {
  54         struct regmap *reg = priv->reg;
  55         u32 val, mask;
  56
  57         val = RST0_USBOTG_BUS | RST0_POR_PICOPHY |
  58               RST0_USBOTG | RST0_USBOTG_32K;
  59         mask = val;
  60         regmap_update_bits(reg, SC_PERIPH_RSTEN0, mask, val);
  61         regmap_update_bits(reg, SC_PERIPH_RSTDIS0, mask, val);
  62 }
  63
  64 static int hi6220_phy_setup(struct hi6220_priv *priv, bool on)
  65 {
  66         struct regmap *reg = priv->reg;
  67         u32 val, mask;
  68         int ret;
  69
  70         if (on) {
  71                 val = CTRL5_USBOTG_RES_SEL | CTRL5_PICOPHY_ACAENB;
  72                 mask = val | CTRL5_PICOPHY_BC_MODE;
  73                 ret = regmap_update_bits(reg, SC_PERIPH_CTRL5, mask, val);
  74                 if (ret)
  75                         goto out;
  76
  77                 val =  CTRL4_PICO_VBUSVLDEXT | CTRL4_PICO_VBUSVLDEXTSEL |
  78                        CTRL4_OTG_PHY_SEL;
  79                 mask = val | CTRL4_PICO_SIDDQ | CTRL4_PICO_OGDISABLE;
  80                 ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
  81                 if (ret)
  82                         goto out;
  83
  84                 ret = regmap_write(reg, SC_PERIPH_CTRL8, EYE_PATTERN_PARA);
  85                 if (ret)
  86                         goto out;
  87         } else {
  88                 val = CTRL4_PICO_SIDDQ;
  89                 mask = val;
  90                 ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
  91                 if (ret)
  92                         goto out;
  93         }
  94
  95         return 0;
  96 out:
  97         dev_err(priv->dev, "failed to setup phy ret: %d\n", ret);
  98         return ret;
  99 }
 100
 101 static int hi6220_phy_start(struct phy *phy)
 102 {
 103         struct hi6220_priv *priv = phy_get_drvdata(phy);
 104
 105         return hi6220_phy_setup(priv, true);
 106 }
 107
 108 static int hi6220_phy_exit(struct phy *phy)
 109 {
 110         struct hi6220_priv *priv = phy_get_drvdata(phy);
 111
 112         return hi6220_phy_setup(priv, false);
 113 }
 114
 115 static const struct phy_ops hi6220_phy_ops = {
 116         .init           = hi6220_phy_start,
 117         .exit           = hi6220_phy_exit,
 118         .owner          = THIS_MODULE,
 119 };
 120
 121 static int hi6220_phy_probe(struct platform_device *pdev)
 122 {
 123         struct phy_provider *phy_provider;
 124         struct device *dev = &pdev->dev;
 125         struct phy *phy;
 126         struct hi6220_priv *priv;
 127
 128         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 129         if (!priv)
 130                 return -ENOMEM;
 131
 132         priv->dev = dev;
 133         priv->reg = syscon_regmap_lookup_by_phandle(dev->of_node,
 134                                         "hisilicon,peripheral-syscon");
 135         if (IS_ERR(priv->reg)) {
 136                 dev_err(dev, "no hisilicon,peripheral-syscon\n");
 137                 return PTR_ERR(priv->reg);
 138         }
 139
 140         hi6220_phy_init(priv);
 141
 142         phy = devm_phy_create(dev, NULL, &hi6220_phy_ops);
 143         if (IS_ERR(phy))
 144                 return PTR_ERR(phy);
 145
 146         phy_set_drvdata(phy, priv);
 147         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 148         return PTR_ERR_OR_ZERO(phy_provider);
 149 }
 150
 151 static const struct of_device_id hi6220_phy_of_match[] = {
 152         {.compatible = "hisilicon,hi6220-usb-phy",},
 153         { },
 154 };
 155 MODULE_DEVICE_TABLE(of, hi6220_phy_of_match);
 156
 157 static struct platform_driver hi6220_phy_driver = {
 158         .probe  = hi6220_phy_probe,
 159         .driver = {
 160                 .name   = "hi6220-usb-phy",
 161                 .of_match_table = hi6220_phy_of_match,
 162         }
 163 };
 164 module_platform_driver(hi6220_phy_driver);
 165
 166 MODULE_DESCRIPTION("HISILICON HI6220 USB PHY driver");
 167 MODULE_ALIAS("platform:hi6220-usb-phy");
 168 MODULE_LICENSE("GPL");