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/global_data.h>
  11 #include <asm/io.h>
  12 #include <dm.h>
  13 #include <errno.h>
  14 #include <generic-phy.h>
  15 #include <regmap.h>
  16 #include <soc.h>
  17 #include <syscon.h>
  18 #include <linux/bitops.h>
  19 #include <linux/err.h>
  20
  21 #define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT    BIT(0)
  22 #define OMAP_USB2_DISABLE_CHG_DET               BIT(1)
  23
  24 #define OMAP_DEV_PHY_PD         BIT(0)
  25 #define OMAP_USB2_PHY_PD        BIT(28)
  26
  27 #define AM437X_USB2_PHY_PD              BIT(0)
  28 #define AM437X_USB2_OTG_PD              BIT(1)
  29 #define AM437X_USB2_OTGVDET_EN          BIT(19)
  30 #define AM437X_USB2_OTGSESSEND_EN       BIT(20)
  31
  32 #define USB2PHY_DISCON_BYP_LATCH        BIT(31)
  33 #define USB2PHY_ANA_CONFIG1             (0x4c)
  34
  35 #define AM654_USB2_OTG_PD               BIT(8)
  36 #define AM654_USB2_VBUS_DET_EN          BIT(5)
  37 #define AM654_USB2_VBUSVALID_DET_EN     BIT(4)
  38
  39 #define USB2PHY_CHRG_DET                 0x14
  40 #define USB2PHY_USE_CHG_DET_REG         BIT(29)
  41 #define USB2PHY_DIS_CHG_DET             BIT(28)
  42
  43 DECLARE_GLOBAL_DATA_PTR;
  44
  45 struct omap_usb2_phy {
  46         struct regmap *pwr_regmap;
  47         ulong flags;
  48         void *phy_base;
  49         u32 pwr_reg_offset;
  50 };
  51
  52 struct usb_phy_data {
  53         const char *label;
  54         u8 flags;
  55         u32 mask;
  56         u32 power_on;
  57         u32 power_off;
  58 };
  59
  60 static const struct usb_phy_data omap5_usb2_data = {
  61         .label = "omap5_usb2",
  62         .flags = 0,
  63         .mask = OMAP_DEV_PHY_PD,
  64         .power_off = OMAP_DEV_PHY_PD,
  65 };
  66
  67 static const struct usb_phy_data dra7x_usb2_data = {
  68         .label = "dra7x_usb2",
  69         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
  70         .mask = OMAP_DEV_PHY_PD,
  71         .power_off = OMAP_DEV_PHY_PD,
  72 };
  73
  74 static const struct usb_phy_data dra7x_usb2_phy2_data = {
  75         .label = "dra7x_usb2_phy2",
  76         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
  77         .mask = OMAP_USB2_PHY_PD,
  78         .power_off = OMAP_USB2_PHY_PD,
  79 };
  80
  81 static const struct usb_phy_data am437x_usb2_data = {
  82         .label = "am437x_usb2",
  83         .flags =  0,
  84         .mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
  85                 AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
  86         .power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
  87         .power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
  88 };
  89
  90 static const struct usb_phy_data am654_usb2_data = {
  91         .label = "am654_usb2",
  92         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
  93         .mask = AM654_USB2_OTG_PD | AM654_USB2_VBUS_DET_EN |
  94                 AM654_USB2_VBUSVALID_DET_EN,
  95         .power_on = AM654_USB2_VBUS_DET_EN | AM654_USB2_VBUSVALID_DET_EN,
  96         .power_off = AM654_USB2_OTG_PD,
  97 };
  98
  99 static const struct udevice_id omap_usb2_id_table[] = {
 100         {
 101                 .compatible = "ti,omap5-usb2",
 102                 .data = (ulong)&omap5_usb2_data,
 103         },
 104         {
 105                 .compatible = "ti,dra7x-usb2",
 106                 .data = (ulong)&dra7x_usb2_data,
 107         },
 108         {
 109                 .compatible = "ti,dra7x-usb2-phy2",
 110                 .data = (ulong)&dra7x_usb2_phy2_data,
 111         },
 112         {
 113                 .compatible = "ti,am437x-usb2",
 114                 .data = (ulong)&am437x_usb2_data,
 115         },
 116         {
 117                 .compatible = "ti,am654-usb2",
 118                 .data = (ulong)&am654_usb2_data,
 119         },
 120         {},
 121 };
 122
 123 static int omap_usb_phy_power(struct phy *usb_phy, bool on)
 124 {
 125         struct udevice *dev = usb_phy->dev;
 126         const struct usb_phy_data *data;
 127         const struct omap_usb2_phy *phy = dev_get_priv(dev);
 128         u32 val;
 129         int rc;
 130
 131         data = (const struct usb_phy_data *)dev_get_driver_data(dev);
 132         if (!data)
 133                 return -EINVAL;
 134
 135         rc = regmap_read(phy->pwr_regmap, phy->pwr_reg_offset, &val);
 136         if (rc)
 137                 return rc;
 138         val &= ~data->mask;
 139         if (on)
 140                 val |= data->power_on;
 141         else
 142                 val |= data->power_off;
 143         rc = regmap_write(phy->pwr_regmap, phy->pwr_reg_offset, val);
 144         if (rc)
 145                 return rc;
 146
 147         return 0;
 148 }
 149
 150 static int omap_usb2_phy_init(struct phy *usb_phy)
 151 {
 152         struct udevice *dev = usb_phy->dev;
 153         struct omap_usb2_phy *priv = dev_get_priv(dev);
 154         u32 val;
 155
 156         if (priv->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 157                 /*
 158                  *
 159                  * Reduce the sensitivity of internal PHY by enabling the
 160                  * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
 161                  * resolves issues with certain devices which can otherwise
 162                  * be prone to false disconnects.
 163                  *
 164                  */
 165                 val = readl(priv->phy_base + USB2PHY_ANA_CONFIG1);
 166                 val |= USB2PHY_DISCON_BYP_LATCH;
 167                 writel(val, priv->phy_base + USB2PHY_ANA_CONFIG1);
 168         }
 169
 170         if (priv->flags & OMAP_USB2_DISABLE_CHG_DET) {
 171                 val = readl(priv->phy_base + USB2PHY_CHRG_DET);
 172                 val |= USB2PHY_USE_CHG_DET_REG | USB2PHY_DIS_CHG_DET;
 173                 writel(val, priv->phy_base + USB2PHY_CHRG_DET);
 174         }
 175
 176         return 0;
 177 }
 178
 179 static int omap_usb2_phy_power_on(struct phy *usb_phy)
 180 {
 181         return omap_usb_phy_power(usb_phy, true);
 182 }
 183
 184 static int omap_usb2_phy_power_off(struct phy *usb_phy)
 185 {
 186         return omap_usb_phy_power(usb_phy, false);
 187 }
 188
 189 static int omap_usb2_phy_exit(struct phy *usb_phy)
 190 {
 191         return omap_usb_phy_power(usb_phy, false);
 192 }
 193
 194 struct phy_ops omap_usb2_phy_ops = {
 195         .init = omap_usb2_phy_init,
 196         .power_on = omap_usb2_phy_power_on,
 197         .power_off = omap_usb2_phy_power_off,
 198         .exit = omap_usb2_phy_exit,
 199 };
 200
 201 static const struct soc_attr am65x_sr10_soc_devices[] = {
 202         { .family = "AM65X", .revision = "SR1.0" },
 203         { /* sentinel */ }
 204 };
 205
 206 int omap_usb2_phy_probe(struct udevice *dev)
 207 {
 208         int rc;
 209         struct regmap *regmap;
 210         struct omap_usb2_phy *priv = dev_get_priv(dev);
 211         const struct usb_phy_data *data;
 212         u32 tmp[2];
 213
 214         data = (const struct usb_phy_data *)dev_get_driver_data(dev);
 215         if (!data)
 216                 return -EINVAL;
 217
 218         priv->phy_base = dev_read_addr_ptr(dev);
 219
 220         if (!priv->phy_base)
 221                 return -EINVAL;
 222
 223         if (data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT)
 224                 priv->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
 225
 226         /*
 227          * AM654x PG1.0 has a silicon bug that D+ is pulled high after
 228          * POR, which could cause enumeration failure with some USB hubs.
 229          * Disabling the USB2_PHY Charger Detect function will put D+
 230          * into the normal state.
 231          *
 232          * Enable this workaround for AM654x PG1.0.
 233          */
 234         if (soc_device_match(am65x_sr10_soc_devices))
 235                 priv->flags |= OMAP_USB2_DISABLE_CHG_DET;
 236
 237         regmap = syscon_regmap_lookup_by_phandle(dev, "syscon-phy-power");
 238         if (!IS_ERR(regmap)) {
 239                 priv->pwr_regmap = regmap;
 240                 rc =  dev_read_u32_array(dev, "syscon-phy-power", tmp, 2);
 241                 if (rc) {
 242                         printf("couldn't get power reg. offset (err %d)\n", rc);
 243                         return rc;
 244                 }
 245                 priv->pwr_reg_offset = tmp[1];
 246                 return 0;
 247         }
 248         regmap = syscon_regmap_lookup_by_phandle(dev, "ctrl-module");
 249         if (!IS_ERR(regmap)) {
 250                 priv->pwr_regmap = regmap;
 251                 priv->pwr_reg_offset = 0;
 252                 return 0;
 253         }
 254
 255         printf("can't get regmap (err %ld)\n", PTR_ERR(regmap));
 256         return PTR_ERR(regmap);
 257 }
 258
 259 U_BOOT_DRIVER(omap_usb2_phy) = {
 260         .name = "omap_usb2_phy",
 261         .id = UCLASS_PHY,
 262         .of_match = omap_usb2_id_table,
 263         .probe = omap_usb2_phy_probe,
 264         .ops = &omap_usb2_phy_ops,
 265         .priv_auto      = sizeof(struct omap_usb2_phy),
 266 };