drivers/phy/omap-usb2-phy.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * OMAP USB2 PHY LAYER
   4  *
   5  * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
   6  * Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
   7  */
   8
   9 #include <common.h>
  10 #include <asm/io.h>
  11 #include <dm.h>
  12 #include <errno.h>
  13 #include <generic-phy.h>
  14 #include <regmap.h>
  15 #include <syscon.h>
  16 #include <linux/err.h>
  17
  18 #define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT    BIT(0)
  19
  20 #define OMAP_DEV_PHY_PD         BIT(0)
  21 #define OMAP_USB2_PHY_PD        BIT(28)
  22
  23 #define AM437X_USB2_PHY_PD              BIT(0)
  24 #define AM437X_USB2_OTG_PD              BIT(1)
  25 #define AM437X_USB2_OTGVDET_EN          BIT(19)
  26 #define AM437X_USB2_OTGSESSEND_EN       BIT(20)
  27
  28 #define USB2PHY_DISCON_BYP_LATCH        BIT(31)
  29 #define USB2PHY_ANA_CONFIG1             (0x4c)
  30
  31 #define AM654_USB2_OTG_PD               BIT(8)
  32 #define AM654_USB2_VBUS_DET_EN          BIT(5)
  33 #define AM654_USB2_VBUSVALID_DET_EN     BIT(4)
  34
  35 DECLARE_GLOBAL_DATA_PTR;
  36
  37 struct omap_usb2_phy {
  38         struct regmap *pwr_regmap;
  39         ulong flags;
  40         void *phy_base;
  41         u32 pwr_reg_offset;
  42 };
  43
  44 struct usb_phy_data {
  45         const char *label;
  46         u8 flags;
  47         u32 mask;
  48         u32 power_on;
  49         u32 power_off;
  50 };
  51
  52 static const struct usb_phy_data omap5_usb2_data = {
  53         .label = "omap5_usb2",
  54         .flags = 0,
  55         .mask = OMAP_DEV_PHY_PD,
  56         .power_off = OMAP_DEV_PHY_PD,
  57 };
  58
  59 static const struct usb_phy_data dra7x_usb2_data = {
  60         .label = "dra7x_usb2",
  61         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
  62         .mask = OMAP_DEV_PHY_PD,
  63         .power_off = OMAP_DEV_PHY_PD,
  64 };
  65
  66 static const struct usb_phy_data dra7x_usb2_phy2_data = {
  67         .label = "dra7x_usb2_phy2",
  68         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
  69         .mask = OMAP_USB2_PHY_PD,
  70         .power_off = OMAP_USB2_PHY_PD,
  71 };
  72
  73 static const struct usb_phy_data am437x_usb2_data = {
  74         .label = "am437x_usb2",
  75         .flags =  0,
  76         .mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
  77                 AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
  78         .power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
  79         .power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
  80 };
  81
  82 static const struct usb_phy_data am654_usb2_data = {
  83         .label = "am654_usb2",
  84         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
  85         .mask = AM654_USB2_OTG_PD | AM654_USB2_VBUS_DET_EN |
  86                 AM654_USB2_VBUSVALID_DET_EN,
  87         .power_on = AM654_USB2_VBUS_DET_EN | AM654_USB2_VBUSVALID_DET_EN,
  88         .power_off = AM654_USB2_OTG_PD,
  89 };
  90
  91 static const struct udevice_id omap_usb2_id_table[] = {
  92         {
  93                 .compatible = "ti,omap5-usb2",
  94                 .data = (ulong)&omap5_usb2_data,
  95         },
  96         {
  97                 .compatible = "ti,dra7x-usb2",
  98                 .data = (ulong)&dra7x_usb2_data,
  99         },
 100         {
 101                 .compatible = "ti,dra7x-usb2-phy2",
 102                 .data = (ulong)&dra7x_usb2_phy2_data,
 103         },
 104         {
 105                 .compatible = "ti,am437x-usb2",
 106                 .data = (ulong)&am437x_usb2_data,
 107         },
 108         {
 109                 .compatible = "ti,am654-usb2",
 110                 .data = (ulong)&am654_usb2_data,
 111         },
 112         {},
 113 };
 114
 115 static int omap_usb_phy_power(struct phy *usb_phy, bool on)
 116 {
 117         struct udevice *dev = usb_phy->dev;
 118         const struct usb_phy_data *data;
 119         const struct omap_usb2_phy *phy = dev_get_priv(dev);
 120         u32 val;
 121         int rc;
 122
 123         data = (const struct usb_phy_data *)dev_get_driver_data(dev);
 124         if (!data)
 125                 return -EINVAL;
 126
 127         rc = regmap_read(phy->pwr_regmap, phy->pwr_reg_offset, &val);
 128         if (rc)
 129                 return rc;
 130         val &= ~data->mask;
 131         if (on)
 132                 val |= data->power_on;
 133         else
 134                 val |= data->power_off;
 135         rc = regmap_write(phy->pwr_regmap, phy->pwr_reg_offset, val);
 136         if (rc)
 137                 return rc;
 138
 139         return 0;
 140 }
 141
 142 static int omap_usb2_phy_init(struct phy *usb_phy)
 143 {
 144         struct udevice *dev = usb_phy->dev;
 145         struct omap_usb2_phy *priv = dev_get_priv(dev);
 146         u32 val;
 147
 148         if (priv->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 149                 /*
 150                  *
 151                  * Reduce the sensitivity of internal PHY by enabling the
 152                  * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
 153                  * resolves issues with certain devices which can otherwise
 154                  * be prone to false disconnects.
 155                  *
 156                  */
 157                 val = readl(priv->phy_base + USB2PHY_ANA_CONFIG1);
 158                 val |= USB2PHY_DISCON_BYP_LATCH;
 159                 writel(val, priv->phy_base + USB2PHY_ANA_CONFIG1);
 160         }
 161
 162         return 0;
 163 }
 164
 165 static int omap_usb2_phy_power_on(struct phy *usb_phy)
 166 {
 167         return omap_usb_phy_power(usb_phy, true);
 168 }
 169
 170 static int omap_usb2_phy_power_off(struct phy *usb_phy)
 171 {
 172         return omap_usb_phy_power(usb_phy, false);
 173 }
 174
 175 static int omap_usb2_phy_exit(struct phy *usb_phy)
 176 {
 177         return omap_usb_phy_power(usb_phy, false);
 178 }
 179
 180 struct phy_ops omap_usb2_phy_ops = {
 181         .init = omap_usb2_phy_init,
 182         .power_on = omap_usb2_phy_power_on,
 183         .power_off = omap_usb2_phy_power_off,
 184         .exit = omap_usb2_phy_exit,
 185 };
 186
 187 int omap_usb2_phy_probe(struct udevice *dev)
 188 {
 189         int rc;
 190         struct regmap *regmap;
 191         struct omap_usb2_phy *priv = dev_get_priv(dev);
 192         const struct usb_phy_data *data;
 193         u32 tmp[2];
 194
 195         data = (const struct usb_phy_data *)dev_get_driver_data(dev);
 196         if (!data)
 197                 return -EINVAL;
 198
 199         if (data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 200                 priv->phy_base = dev_read_addr_ptr(dev);
 201
 202                 if (!priv->phy_base)
 203                         return -EINVAL;
 204                 priv->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
 205         }
 206
 207         regmap = syscon_regmap_lookup_by_phandle(dev, "syscon-phy-power");
 208         if (!IS_ERR(regmap)) {
 209                 priv->pwr_regmap = regmap;
 210                 rc =  dev_read_u32_array(dev, "syscon-phy-power", tmp, 2);
 211                 if (rc) {
 212                         printf("couldn't get power reg. offset (err %d)\n", rc);
 213                         return rc;
 214                 }
 215                 priv->pwr_reg_offset = tmp[1];
 216                 return 0;
 217         }
 218         regmap = syscon_regmap_lookup_by_phandle(dev, "ctrl-module");
 219         if (!IS_ERR(regmap)) {
 220                 priv->pwr_regmap = regmap;
 221                 priv->pwr_reg_offset = 0;
 222                 return 0;
 223         }
 224
 225         printf("can't get regmap (err %ld)\n", PTR_ERR(regmap));
 226         return PTR_ERR(regmap);
 227 }
 228
 229 U_BOOT_DRIVER(omap_usb2_phy) = {
 230         .name = "omap_usb2_phy",
 231         .id = UCLASS_PHY,
 232         .of_match = omap_usb2_id_table,
 233         .probe = omap_usb2_phy_probe,
 234         .ops = &omap_usb2_phy_ops,
 235         .priv_auto_alloc_size = sizeof(struct omap_usb2_phy),
 236 };