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