drivers/usb/dwc3/dwc3-generic.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Generic DWC3 Glue layer
   4  *
   5  * Copyright (C) 2016 - 2018 Xilinx, Inc.
   6  *
   7  * Based on dwc3-omap.c.
   8  */
   9
  10 #include <common.h>
  11 #include <asm-generic/io.h>
  12 #include <dm.h>
  13 #include <dm/device-internal.h>
  14 #include <dm/lists.h>
  15 #include <dwc3-uboot.h>
  16 #include <linux/usb/ch9.h>
  17 #include <linux/usb/gadget.h>
  18 #include <malloc.h>
  19 #include <usb.h>
  20 #include "core.h"
  21 #include "gadget.h"
  22 #include <reset.h>
  23 #include <clk.h>
  24 #include <usb/xhci.h>
  25
  26 struct dwc3_generic_plat {
  27         fdt_addr_t base;
  28         u32 maximum_speed;
  29         enum usb_dr_mode dr_mode;
  30 };
  31
  32 struct dwc3_generic_priv {
  33         void *base;
  34         struct dwc3 dwc3;
  35         struct phy *phys;
  36         int num_phys;
  37 };
  38
  39 struct dwc3_generic_host_priv {
  40         struct xhci_ctrl xhci_ctrl;
  41         struct dwc3_generic_priv gen_priv;
  42 };
  43
  44 static int dwc3_generic_probe(struct udevice *dev,
  45                               struct dwc3_generic_priv *priv)
  46 {
  47         int rc;
  48         struct dwc3_generic_plat *plat = dev_get_platdata(dev);
  49         struct dwc3 *dwc3 = &priv->dwc3;
  50
  51         dwc3->dev = dev;
  52         dwc3->maximum_speed = plat->maximum_speed;
  53         dwc3->dr_mode = plat->dr_mode;
  54 #if CONFIG_IS_ENABLED(OF_CONTROL)
  55         dwc3_of_parse(dwc3);
  56 #endif
  57
  58         rc = dwc3_setup_phy(dev, &priv->phys, &priv->num_phys);
  59         if (rc)
  60                 return rc;
  61
  62         priv->base = map_physmem(plat->base, DWC3_OTG_REGS_END, MAP_NOCACHE);
  63         dwc3->regs = priv->base + DWC3_GLOBALS_REGS_START;
  64
  65
  66         rc =  dwc3_init(dwc3);
  67         if (rc) {
  68                 unmap_physmem(priv->base, MAP_NOCACHE);
  69                 return rc;
  70         }
  71
  72         return 0;
  73 }
  74
  75 static int dwc3_generic_remove(struct udevice *dev,
  76                                struct dwc3_generic_priv *priv)
  77 {
  78         struct dwc3 *dwc3 = &priv->dwc3;
  79
  80         dwc3_remove(dwc3);
  81         dwc3_shutdown_phy(dev, priv->phys, priv->num_phys);
  82         unmap_physmem(dwc3->regs, MAP_NOCACHE);
  83
  84         return 0;
  85 }
  86
  87 static int dwc3_generic_ofdata_to_platdata(struct udevice *dev)
  88 {
  89         struct dwc3_generic_plat *plat = dev_get_platdata(dev);
  90         int node = dev_of_offset(dev);
  91
  92         plat->base = devfdt_get_addr(dev);
  93
  94         plat->maximum_speed = usb_get_maximum_speed(node);
  95         if (plat->maximum_speed == USB_SPEED_UNKNOWN) {
  96                 pr_info("No USB maximum speed specified. Using super speed\n");
  97                 plat->maximum_speed = USB_SPEED_SUPER;
  98         }
  99
 100         plat->dr_mode = usb_get_dr_mode(node);
 101         if (plat->dr_mode == USB_DR_MODE_UNKNOWN) {
 102                 pr_err("Invalid usb mode setup\n");
 103                 return -ENODEV;
 104         }
 105
 106         return 0;
 107 }
 108
 109 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 110 int dm_usb_gadget_handle_interrupts(struct udevice *dev)
 111 {
 112         struct dwc3_generic_priv *priv = dev_get_priv(dev);
 113         struct dwc3 *dwc3 = &priv->dwc3;
 114
 115         dwc3_gadget_uboot_handle_interrupt(dwc3);
 116
 117         return 0;
 118 }
 119
 120 static int dwc3_generic_peripheral_probe(struct udevice *dev)
 121 {
 122         struct dwc3_generic_priv *priv = dev_get_priv(dev);
 123
 124         return dwc3_generic_probe(dev, priv);
 125 }
 126
 127 static int dwc3_generic_peripheral_remove(struct udevice *dev)
 128 {
 129         struct dwc3_generic_priv *priv = dev_get_priv(dev);
 130
 131         return dwc3_generic_remove(dev, priv);
 132 }
 133
 134 U_BOOT_DRIVER(dwc3_generic_peripheral) = {
 135         .name   = "dwc3-generic-peripheral",
 136         .id     = UCLASS_USB_GADGET_GENERIC,
 137         .ofdata_to_platdata = dwc3_generic_ofdata_to_platdata,
 138         .probe = dwc3_generic_peripheral_probe,
 139         .remove = dwc3_generic_peripheral_remove,
 140         .priv_auto_alloc_size = sizeof(struct dwc3_generic_priv),
 141         .platdata_auto_alloc_size = sizeof(struct dwc3_generic_plat),
 142 };
 143 #endif
 144
 145 #if defined(CONFIG_SPL_USB_HOST_SUPPORT) || !defined(CONFIG_SPL_BUILD)
 146 static int dwc3_generic_host_probe(struct udevice *dev)
 147 {
 148         struct xhci_hcor *hcor;
 149         struct xhci_hccr *hccr;
 150         struct dwc3_generic_host_priv *priv = dev_get_priv(dev);
 151         int rc;
 152
 153         rc = dwc3_generic_probe(dev, &priv->gen_priv);
 154         if (rc)
 155                 return rc;
 156
 157         hccr = (struct xhci_hccr *)priv->gen_priv.base;
 158         hcor = (struct xhci_hcor *)(priv->gen_priv.base +
 159                         HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));
 160
 161         return xhci_register(dev, hccr, hcor);
 162 }
 163
 164 static int dwc3_generic_host_remove(struct udevice *dev)
 165 {
 166         struct dwc3_generic_host_priv *priv = dev_get_priv(dev);
 167         int rc;
 168
 169         rc = xhci_deregister(dev);
 170         if (rc)
 171                 return rc;
 172
 173         return dwc3_generic_remove(dev, &priv->gen_priv);
 174 }
 175
 176 U_BOOT_DRIVER(dwc3_generic_host) = {
 177         .name   = "dwc3-generic-host",
 178         .id     = UCLASS_USB,
 179         .ofdata_to_platdata = dwc3_generic_ofdata_to_platdata,
 180         .probe = dwc3_generic_host_probe,
 181         .remove = dwc3_generic_host_remove,
 182         .priv_auto_alloc_size = sizeof(struct dwc3_generic_host_priv),
 183         .platdata_auto_alloc_size = sizeof(struct dwc3_generic_plat),
 184         .ops = &xhci_usb_ops,
 185         .flags = DM_FLAG_ALLOC_PRIV_DMA,
 186 };
 187 #endif
 188
 189 struct dwc3_glue_data {
 190         struct clk_bulk         clks;
 191         struct reset_ctl_bulk   resets;
 192         fdt_addr_t regs;
 193 };
 194
 195 struct dwc3_glue_ops {
 196         void (*select_dr_mode)(struct udevice *dev, int index,
 197                                enum usb_dr_mode mode);
 198 };
 199
 200 void dwc3_ti_select_dr_mode(struct udevice *dev, int index,
 201                             enum usb_dr_mode mode)
 202 {
 203 #define USBOTGSS_UTMI_OTG_STATUS                0x0084
 204 #define USBOTGSS_UTMI_OTG_OFFSET                0x0480
 205
 206 /* UTMI_OTG_STATUS REGISTER */
 207 #define USBOTGSS_UTMI_OTG_STATUS_SW_MODE        BIT(31)
 208 #define USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT   BIT(9)
 209 #define USBOTGSS_UTMI_OTG_STATUS_TXBITSTUFFENABLE BIT(8)
 210 #define USBOTGSS_UTMI_OTG_STATUS_IDDIG          BIT(4)
 211 #define USBOTGSS_UTMI_OTG_STATUS_SESSEND        BIT(3)
 212 #define USBOTGSS_UTMI_OTG_STATUS_SESSVALID      BIT(2)
 213 #define USBOTGSS_UTMI_OTG_STATUS_VBUSVALID      BIT(1)
 214 enum dwc3_omap_utmi_mode {
 215         DWC3_OMAP_UTMI_MODE_UNKNOWN = 0,
 216         DWC3_OMAP_UTMI_MODE_HW,
 217         DWC3_OMAP_UTMI_MODE_SW,
 218 };
 219
 220         u32 use_id_pin;
 221         u32 host_mode;
 222         u32 reg;
 223         u32 utmi_mode;
 224         u32 utmi_status_offset = USBOTGSS_UTMI_OTG_STATUS;
 225
 226         struct dwc3_glue_data *glue = dev_get_platdata(dev);
 227         void *base = map_physmem(glue->regs, 0x10000, MAP_NOCACHE);
 228
 229         if (device_is_compatible(dev, "ti,am437x-dwc3"))
 230                 utmi_status_offset += USBOTGSS_UTMI_OTG_OFFSET;
 231
 232         utmi_mode = dev_read_u32_default(dev, "utmi-mode",
 233                                          DWC3_OMAP_UTMI_MODE_UNKNOWN);
 234         if (utmi_mode != DWC3_OMAP_UTMI_MODE_HW) {
 235                 debug("%s: OTG is not supported. defaulting to PERIPHERAL\n",
 236                       dev->name);
 237                 mode = USB_DR_MODE_PERIPHERAL;
 238         }
 239
 240         switch (mode)  {
 241         case USB_DR_MODE_PERIPHERAL:
 242                 use_id_pin = 0;
 243                 host_mode = 0;
 244                 break;
 245         case USB_DR_MODE_HOST:
 246                 use_id_pin = 0;
 247                 host_mode = 1;
 248                 break;
 249         case USB_DR_MODE_OTG:
 250         default:
 251                 use_id_pin = 1;
 252                 host_mode = 0;
 253                 break;
 254         }
 255
 256         reg = readl(base + utmi_status_offset);
 257
 258         reg &= ~(USBOTGSS_UTMI_OTG_STATUS_SW_MODE);
 259         if (!use_id_pin)
 260                 reg |= USBOTGSS_UTMI_OTG_STATUS_SW_MODE;
 261
 262         writel(reg, base + utmi_status_offset);
 263
 264         reg &= ~(USBOTGSS_UTMI_OTG_STATUS_SESSEND |
 265                 USBOTGSS_UTMI_OTG_STATUS_VBUSVALID |
 266                 USBOTGSS_UTMI_OTG_STATUS_IDDIG);
 267
 268         reg |= USBOTGSS_UTMI_OTG_STATUS_SESSVALID |
 269                 USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;
 270
 271         if (!host_mode)
 272                 reg |= USBOTGSS_UTMI_OTG_STATUS_IDDIG |
 273                         USBOTGSS_UTMI_OTG_STATUS_VBUSVALID;
 274
 275         writel(reg, base + utmi_status_offset);
 276
 277         unmap_physmem(base, MAP_NOCACHE);
 278 }
 279
 280 struct dwc3_glue_ops ti_ops = {
 281         .select_dr_mode = dwc3_ti_select_dr_mode,
 282 };
 283
 284 static int dwc3_glue_bind(struct udevice *parent)
 285 {
 286         const void *fdt = gd->fdt_blob;
 287         int node;
 288         int ret;
 289
 290         for (node = fdt_first_subnode(fdt, dev_of_offset(parent)); node > 0;
 291              node = fdt_next_subnode(fdt, node)) {
 292                 const char *name = fdt_get_name(fdt, node, NULL);
 293                 enum usb_dr_mode dr_mode;
 294                 struct udevice *dev;
 295                 const char *driver = NULL;
 296
 297                 debug("%s: subnode name: %s\n", __func__, name);
 298
 299                 dr_mode = usb_get_dr_mode(node);
 300
 301                 switch (dr_mode) {
 302                 case USB_DR_MODE_PERIPHERAL:
 303                 case USB_DR_MODE_OTG:
 304 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 305                         debug("%s: dr_mode: OTG or Peripheral\n", __func__);
 306                         driver = "dwc3-generic-peripheral";
 307 #endif
 308                         break;
 309 #if defined(CONFIG_SPL_USB_HOST_SUPPORT) || !defined(CONFIG_SPL_BUILD)
 310                 case USB_DR_MODE_HOST:
 311                         debug("%s: dr_mode: HOST\n", __func__);
 312                         driver = "dwc3-generic-host";
 313                         break;
 314 #endif
 315                 default:
 316                         debug("%s: unsupported dr_mode\n", __func__);
 317                         return -ENODEV;
 318                 };
 319
 320                 if (!driver)
 321                         continue;
 322
 323                 ret = device_bind_driver_to_node(parent, driver, name,
 324                                                  offset_to_ofnode(node), &dev);
 325                 if (ret) {
 326                         debug("%s: not able to bind usb device mode\n",
 327                               __func__);
 328                         return ret;
 329                 }
 330         }
 331
 332         return 0;
 333 }
 334
 335 static int dwc3_glue_reset_init(struct udevice *dev,
 336                                 struct dwc3_glue_data *glue)
 337 {
 338         int ret;
 339
 340         ret = reset_get_bulk(dev, &glue->resets);
 341         if (ret == -ENOTSUPP || ret == -ENOENT)
 342                 return 0;
 343         else if (ret)
 344                 return ret;
 345
 346         ret = reset_deassert_bulk(&glue->resets);
 347         if (ret) {
 348                 reset_release_bulk(&glue->resets);
 349                 return ret;
 350         }
 351
 352         return 0;
 353 }
 354
 355 static int dwc3_glue_clk_init(struct udevice *dev,
 356                               struct dwc3_glue_data *glue)
 357 {
 358         int ret;
 359
 360         ret = clk_get_bulk(dev, &glue->clks);
 361         if (ret == -ENOSYS || ret == -ENOENT)
 362                 return 0;
 363         if (ret)
 364                 return ret;
 365
 366 #if CONFIG_IS_ENABLED(CLK)
 367         ret = clk_enable_bulk(&glue->clks);
 368         if (ret) {
 369                 clk_release_bulk(&glue->clks);
 370                 return ret;
 371         }
 372 #endif
 373
 374         return 0;
 375 }
 376
 377 static int dwc3_glue_probe(struct udevice *dev)
 378 {
 379         struct dwc3_glue_ops *ops = (struct dwc3_glue_ops *)dev_get_driver_data(dev);
 380         struct dwc3_glue_data *glue = dev_get_platdata(dev);
 381         struct udevice *child = NULL;
 382         int index = 0;
 383         int ret;
 384
 385         glue->regs = dev_read_addr(dev);
 386
 387         ret = dwc3_glue_clk_init(dev, glue);
 388         if (ret)
 389                 return ret;
 390
 391         ret = dwc3_glue_reset_init(dev, glue);
 392         if (ret)
 393                 return ret;
 394
 395         ret = device_find_first_child(dev, &child);
 396         if (ret)
 397                 return ret;
 398
 399         while (child) {
 400                 enum usb_dr_mode dr_mode;
 401
 402                 dr_mode = usb_get_dr_mode(dev_of_offset(child));
 403                 device_find_next_child(&child);
 404                 if (ops && ops->select_dr_mode)
 405                         ops->select_dr_mode(dev, index, dr_mode);
 406                 index++;
 407         }
 408
 409         return 0;
 410 }
 411
 412 static int dwc3_glue_remove(struct udevice *dev)
 413 {
 414         struct dwc3_glue_data *glue = dev_get_platdata(dev);
 415
 416         reset_release_bulk(&glue->resets);
 417
 418         clk_release_bulk(&glue->clks);
 419
 420         return 0;
 421 }
 422
 423 static const struct udevice_id dwc3_glue_ids[] = {
 424         { .compatible = "xlnx,zynqmp-dwc3" },
 425         { .compatible = "ti,keystone-dwc3"},
 426         { .compatible = "ti,dwc3", .data = (ulong)&ti_ops },
 427         { .compatible = "ti,am437x-dwc3", .data = (ulong)&ti_ops },
 428         { }
 429 };
 430
 431 U_BOOT_DRIVER(dwc3_generic_wrapper) = {
 432         .name   = "dwc3-generic-wrapper",
 433         .id     = UCLASS_NOP,
 434         .of_match = dwc3_glue_ids,
 435         .bind = dwc3_glue_bind,
 436         .probe = dwc3_glue_probe,
 437         .remove = dwc3_glue_remove,
 438         .platdata_auto_alloc_size = sizeof(struct dwc3_glue_data),
 439
 440 };