drivers/usb/dwc3/core.c

   1 /**
   2  * core.c - DesignWare USB3 DRD Controller Core file
   3  *
   4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Authors: Felipe Balbi <balbi@ti.com>,
   7  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions, and the following disclaimer,
  14  *    without modification.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. The names of the above-listed copyright holders may not be used
  19  *    to endorse or promote products derived from this software without
  20  *    specific prior written permission.
  21  *
  22  * ALTERNATIVELY, this software may be distributed under the terms of the
  23  * GNU General Public License ("GPL") version 2, as published by the Free
  24  * Software Foundation.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  27  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  28  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  29  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  30  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  31  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  32  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  33  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  34  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  35  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  36  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #include <linux/module.h>
  40 #include <linux/kernel.h>
  41 #include <linux/slab.h>
  42 #include <linux/spinlock.h>
  43 #include <linux/platform_device.h>
  44 #include <linux/pm_runtime.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/ioport.h>
  47 #include <linux/io.h>
  48 #include <linux/list.h>
  49 #include <linux/delay.h>
  50 #include <linux/dma-mapping.h>
  51 #include <linux/of.h>
  52
  53 #include <linux/usb/otg.h>
  54 #include <linux/usb/ch9.h>
  55 #include <linux/usb/gadget.h>
  56
  57 #include "core.h"
  58 #include "gadget.h"
  59 #include "io.h"
  60
  61 #include "debug.h"
  62
  63 static char *maximum_speed = "super";
  64 module_param(maximum_speed, charp, 0);
  65 MODULE_PARM_DESC(maximum_speed, "Maximum supported speed.");
  66
  67 /* -------------------------------------------------------------------------- */
  68
  69 void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
  70 {
  71         u32 reg;
  72
  73         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
  74         reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
  75         reg |= DWC3_GCTL_PRTCAPDIR(mode);
  76         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
  77 }
  78
  79 /**
  80  * dwc3_core_soft_reset - Issues core soft reset and PHY reset
  81  * @dwc: pointer to our context structure
  82  */
  83 static void dwc3_core_soft_reset(struct dwc3 *dwc)
  84 {
  85         u32             reg;
  86
  87         /* Before Resetting PHY, put Core in Reset */
  88         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
  89         reg |= DWC3_GCTL_CORESOFTRESET;
  90         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
  91
  92         /* Assert USB3 PHY reset */
  93         reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
  94         reg |= DWC3_GUSB3PIPECTL_PHYSOFTRST;
  95         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
  96
  97         /* Assert USB2 PHY reset */
  98         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
  99         reg |= DWC3_GUSB2PHYCFG_PHYSOFTRST;
 100         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 101
 102         usb_phy_init(dwc->usb2_phy);
 103         usb_phy_init(dwc->usb3_phy);
 104         mdelay(100);
 105
 106         /* Clear USB3 PHY reset */
 107         reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
 108         reg &= ~DWC3_GUSB3PIPECTL_PHYSOFTRST;
 109         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 110
 111         /* Clear USB2 PHY reset */
 112         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
 113         reg &= ~DWC3_GUSB2PHYCFG_PHYSOFTRST;
 114         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 115
 116         mdelay(100);
 117
 118         /* After PHYs are stable we can take Core out of reset state */
 119         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 120         reg &= ~DWC3_GCTL_CORESOFTRESET;
 121         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 122 }
 123
 124 /**
 125  * dwc3_free_one_event_buffer - Frees one event buffer
 126  * @dwc: Pointer to our controller context structure
 127  * @evt: Pointer to event buffer to be freed
 128  */
 129 static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
 130                 struct dwc3_event_buffer *evt)
 131 {
 132         dma_free_coherent(dwc->dev, evt->length, evt->buf, evt->dma);
 133 }
 134
 135 /**
 136  * dwc3_alloc_one_event_buffer - Allocates one event buffer structure
 137  * @dwc: Pointer to our controller context structure
 138  * @length: size of the event buffer
 139  *
 140  * Returns a pointer to the allocated event buffer structure on success
 141  * otherwise ERR_PTR(errno).
 142  */
 143 static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc, unsigned length)
 144 {
 145         struct dwc3_event_buffer        *evt;
 146
 147         evt = devm_kzalloc(dwc->dev, sizeof(*evt), GFP_KERNEL);
 148         if (!evt)
 149                 return ERR_PTR(-ENOMEM);
 150
 151         evt->dwc        = dwc;
 152         evt->length     = length;
 153         evt->buf        = dma_alloc_coherent(dwc->dev, length,
 154                         &evt->dma, GFP_KERNEL);
 155         if (!evt->buf)
 156                 return ERR_PTR(-ENOMEM);
 157
 158         return evt;
 159 }
 160
 161 /**
 162  * dwc3_free_event_buffers - frees all allocated event buffers
 163  * @dwc: Pointer to our controller context structure
 164  */
 165 static void dwc3_free_event_buffers(struct dwc3 *dwc)
 166 {
 167         struct dwc3_event_buffer        *evt;
 168         int i;
 169
 170         for (i = 0; i < dwc->num_event_buffers; i++) {
 171                 evt = dwc->ev_buffs[i];
 172                 if (evt)
 173                         dwc3_free_one_event_buffer(dwc, evt);
 174         }
 175 }
 176
 177 /**
 178  * dwc3_alloc_event_buffers - Allocates @num event buffers of size @length
 179  * @dwc: pointer to our controller context structure
 180  * @length: size of event buffer
 181  *
 182  * Returns 0 on success otherwise negative errno. In the error case, dwc
 183  * may contain some buffers allocated but not all which were requested.
 184  */
 185 static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length)
 186 {
 187         int                     num;
 188         int                     i;
 189
 190         num = DWC3_NUM_INT(dwc->hwparams.hwparams1);
 191         dwc->num_event_buffers = num;
 192
 193         dwc->ev_buffs = devm_kzalloc(dwc->dev, sizeof(*dwc->ev_buffs) * num,
 194                         GFP_KERNEL);
 195         if (!dwc->ev_buffs) {
 196                 dev_err(dwc->dev, "can't allocate event buffers array\n");
 197                 return -ENOMEM;
 198         }
 199
 200         for (i = 0; i < num; i++) {
 201                 struct dwc3_event_buffer        *evt;
 202
 203                 evt = dwc3_alloc_one_event_buffer(dwc, length);
 204                 if (IS_ERR(evt)) {
 205                         dev_err(dwc->dev, "can't allocate event buffer\n");
 206                         return PTR_ERR(evt);
 207                 }
 208                 dwc->ev_buffs[i] = evt;
 209         }
 210
 211         return 0;
 212 }
 213
 214 /**
 215  * dwc3_event_buffers_setup - setup our allocated event buffers
 216  * @dwc: pointer to our controller context structure
 217  *
 218  * Returns 0 on success otherwise negative errno.
 219  */
 220 static int dwc3_event_buffers_setup(struct dwc3 *dwc)
 221 {
 222         struct dwc3_event_buffer        *evt;
 223         int                             n;
 224
 225         for (n = 0; n < dwc->num_event_buffers; n++) {
 226                 evt = dwc->ev_buffs[n];
 227                 dev_dbg(dwc->dev, "Event buf %p dma %08llx length %d\n",
 228                                 evt->buf, (unsigned long long) evt->dma,
 229                                 evt->length);
 230
 231                 evt->lpos = 0;
 232
 233                 dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(n),
 234                                 lower_32_bits(evt->dma));
 235                 dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(n),
 236                                 upper_32_bits(evt->dma));
 237                 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(n),
 238                                 evt->length & 0xffff);
 239                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(n), 0);
 240         }
 241
 242         return 0;
 243 }
 244
 245 static void dwc3_event_buffers_cleanup(struct dwc3 *dwc)
 246 {
 247         struct dwc3_event_buffer        *evt;
 248         int                             n;
 249
 250         for (n = 0; n < dwc->num_event_buffers; n++) {
 251                 evt = dwc->ev_buffs[n];
 252
 253                 evt->lpos = 0;
 254
 255                 dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(n), 0);
 256                 dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(n), 0);
 257                 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(n), 0);
 258                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(n), 0);
 259         }
 260 }
 261
 262 static void dwc3_cache_hwparams(struct dwc3 *dwc)
 263 {
 264         struct dwc3_hwparams    *parms = &dwc->hwparams;
 265
 266         parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0);
 267         parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1);
 268         parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2);
 269         parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3);
 270         parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4);
 271         parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5);
 272         parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6);
 273         parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7);
 274         parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8);
 275 }
 276
 277 /**
 278  * dwc3_core_init - Low-level initialization of DWC3 Core
 279  * @dwc: Pointer to our controller context structure
 280  *
 281  * Returns 0 on success otherwise negative errno.
 282  */
 283 static int dwc3_core_init(struct dwc3 *dwc)
 284 {
 285         unsigned long           timeout;
 286         u32                     reg;
 287         int                     ret;
 288
 289         reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
 290         /* This should read as U3 followed by revision number */
 291         if ((reg & DWC3_GSNPSID_MASK) != 0x55330000) {
 292                 dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
 293                 ret = -ENODEV;
 294                 goto err0;
 295         }
 296         dwc->revision = reg;
 297
 298         /* issue device SoftReset too */
 299         timeout = jiffies + msecs_to_jiffies(500);
 300         dwc3_writel(dwc->regs, DWC3_DCTL, DWC3_DCTL_CSFTRST);
 301         do {
 302                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 303                 if (!(reg & DWC3_DCTL_CSFTRST))
 304                         break;
 305
 306                 if (time_after(jiffies, timeout)) {
 307                         dev_err(dwc->dev, "Reset Timed Out\n");
 308                         ret = -ETIMEDOUT;
 309                         goto err0;
 310                 }
 311
 312                 cpu_relax();
 313         } while (true);
 314
 315         dwc3_core_soft_reset(dwc);
 316
 317         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 318         reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
 319         reg &= ~DWC3_GCTL_DISSCRAMBLE;
 320
 321         switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) {
 322         case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
 323                 reg &= ~DWC3_GCTL_DSBLCLKGTNG;
 324                 break;
 325         default:
 326                 dev_dbg(dwc->dev, "No power optimization available\n");
 327         }
 328
 329         /*
 330          * WORKAROUND: DWC3 revisions <1.90a have a bug
 331          * where the device can fail to connect at SuperSpeed
 332          * and falls back to high-speed mode which causes
 333          * the device to enter a Connect/Disconnect loop
 334          */
 335         if (dwc->revision < DWC3_REVISION_190A)
 336                 reg |= DWC3_GCTL_U2RSTECN;
 337
 338         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 339
 340         ret = dwc3_event_buffers_setup(dwc);
 341         if (ret) {
 342                 dev_err(dwc->dev, "failed to setup event buffers\n");
 343                 goto err0;
 344         }
 345
 346         return 0;
 347
 348 err0:
 349         return ret;
 350 }
 351
 352 static void dwc3_core_exit(struct dwc3 *dwc)
 353 {
 354         dwc3_event_buffers_cleanup(dwc);
 355
 356         usb_phy_shutdown(dwc->usb2_phy);
 357         usb_phy_shutdown(dwc->usb3_phy);
 358 }
 359
 360 #define DWC3_ALIGN_MASK         (16 - 1)
 361
 362 static int dwc3_probe(struct platform_device *pdev)
 363 {
 364         struct device_node      *node = pdev->dev.of_node;
 365         struct resource         *res;
 366         struct dwc3             *dwc;
 367         struct device           *dev = &pdev->dev;
 368
 369         int                     ret = -ENOMEM;
 370
 371         void __iomem            *regs;
 372         void                    *mem;
 373
 374         u8                      mode;
 375
 376         mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
 377         if (!mem) {
 378                 dev_err(dev, "not enough memory\n");
 379                 return -ENOMEM;
 380         }
 381         dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
 382         dwc->mem = mem;
 383
 384         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 385         if (!res) {
 386                 dev_err(dev, "missing IRQ\n");
 387                 return -ENODEV;
 388         }
 389         dwc->xhci_resources[1].start = res->start;
 390         dwc->xhci_resources[1].end = res->end;
 391         dwc->xhci_resources[1].flags = res->flags;
 392         dwc->xhci_resources[1].name = res->name;
 393
 394         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 395         if (!res) {
 396                 dev_err(dev, "missing memory resource\n");
 397                 return -ENODEV;
 398         }
 399         dwc->xhci_resources[0].start = res->start;
 400         dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
 401                                         DWC3_XHCI_REGS_END;
 402         dwc->xhci_resources[0].flags = res->flags;
 403         dwc->xhci_resources[0].name = res->name;
 404
 405          /*
 406           * Request memory region but exclude xHCI regs,
 407           * since it will be requested by the xhci-plat driver.
 408           */
 409         res = devm_request_mem_region(dev, res->start + DWC3_GLOBALS_REGS_START,
 410                         resource_size(res) - DWC3_GLOBALS_REGS_START,
 411                         dev_name(dev));
 412         if (!res) {
 413                 dev_err(dev, "can't request mem region\n");
 414                 return -ENOMEM;
 415         }
 416
 417         regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
 418         if (!regs) {
 419                 dev_err(dev, "ioremap failed\n");
 420                 return -ENOMEM;
 421         }
 422
 423         if (node) {
 424                 dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
 425                 dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
 426         } else {
 427                 dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 428                 dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
 429         }
 430
 431         if (IS_ERR_OR_NULL(dwc->usb2_phy)) {
 432                 dev_err(dev, "no usb2 phy configured\n");
 433                 return -EPROBE_DEFER;
 434         }
 435
 436         if (IS_ERR_OR_NULL(dwc->usb3_phy)) {
 437                 dev_err(dev, "no usb3 phy configured\n");
 438                 return -EPROBE_DEFER;
 439         }
 440
 441         usb_phy_set_suspend(dwc->usb2_phy, 0);
 442         usb_phy_set_suspend(dwc->usb3_phy, 0);
 443
 444         spin_lock_init(&dwc->lock);
 445         platform_set_drvdata(pdev, dwc);
 446
 447         dwc->regs       = regs;
 448         dwc->regs_size  = resource_size(res);
 449         dwc->dev        = dev;
 450
 451         if (!strncmp("super", maximum_speed, 5))
 452                 dwc->maximum_speed = DWC3_DCFG_SUPERSPEED;
 453         else if (!strncmp("high", maximum_speed, 4))
 454                 dwc->maximum_speed = DWC3_DCFG_HIGHSPEED;
 455         else if (!strncmp("full", maximum_speed, 4))
 456                 dwc->maximum_speed = DWC3_DCFG_FULLSPEED1;
 457         else if (!strncmp("low", maximum_speed, 3))
 458                 dwc->maximum_speed = DWC3_DCFG_LOWSPEED;
 459         else
 460                 dwc->maximum_speed = DWC3_DCFG_SUPERSPEED;
 461
 462         dwc->needs_fifo_resize = of_property_read_bool(node, "tx-fifo-resize");
 463
 464         pm_runtime_enable(dev);
 465         pm_runtime_get_sync(dev);
 466         pm_runtime_forbid(dev);
 467
 468         dwc3_cache_hwparams(dwc);
 469
 470         ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
 471         if (ret) {
 472                 dev_err(dwc->dev, "failed to allocate event buffers\n");
 473                 ret = -ENOMEM;
 474                 goto err0;
 475         }
 476
 477         ret = dwc3_core_init(dwc);
 478         if (ret) {
 479                 dev_err(dev, "failed to initialize core\n");
 480                 goto err0;
 481         }
 482
 483         mode = DWC3_MODE(dwc->hwparams.hwparams0);
 484
 485         switch (mode) {
 486         case DWC3_MODE_DEVICE:
 487                 dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
 488                 ret = dwc3_gadget_init(dwc);
 489                 if (ret) {
 490                         dev_err(dev, "failed to initialize gadget\n");
 491                         goto err1;
 492                 }
 493                 break;
 494         case DWC3_MODE_HOST:
 495                 dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST);
 496                 ret = dwc3_host_init(dwc);
 497                 if (ret) {
 498                         dev_err(dev, "failed to initialize host\n");
 499                         goto err1;
 500                 }
 501                 break;
 502         case DWC3_MODE_DRD:
 503                 dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
 504                 ret = dwc3_host_init(dwc);
 505                 if (ret) {
 506                         dev_err(dev, "failed to initialize host\n");
 507                         goto err1;
 508                 }
 509
 510                 ret = dwc3_gadget_init(dwc);
 511                 if (ret) {
 512                         dev_err(dev, "failed to initialize gadget\n");
 513                         goto err1;
 514                 }
 515                 break;
 516         default:
 517                 dev_err(dev, "Unsupported mode of operation %d\n", mode);
 518                 goto err1;
 519         }
 520         dwc->mode = mode;
 521
 522         ret = dwc3_debugfs_init(dwc);
 523         if (ret) {
 524                 dev_err(dev, "failed to initialize debugfs\n");
 525                 goto err2;
 526         }
 527
 528         pm_runtime_allow(dev);
 529
 530         return 0;
 531
 532 err2:
 533         switch (mode) {
 534         case DWC3_MODE_DEVICE:
 535                 dwc3_gadget_exit(dwc);
 536                 break;
 537         case DWC3_MODE_HOST:
 538                 dwc3_host_exit(dwc);
 539                 break;
 540         case DWC3_MODE_DRD:
 541                 dwc3_host_exit(dwc);
 542                 dwc3_gadget_exit(dwc);
 543                 break;
 544         default:
 545                 /* do nothing */
 546                 break;
 547         }
 548
 549 err1:
 550         dwc3_core_exit(dwc);
 551
 552 err0:
 553         dwc3_free_event_buffers(dwc);
 554
 555         return ret;
 556 }
 557
 558 static int dwc3_remove(struct platform_device *pdev)
 559 {
 560         struct dwc3     *dwc = platform_get_drvdata(pdev);
 561
 562         usb_phy_set_suspend(dwc->usb2_phy, 1);
 563         usb_phy_set_suspend(dwc->usb3_phy, 1);
 564
 565         pm_runtime_put(&pdev->dev);
 566         pm_runtime_disable(&pdev->dev);
 567
 568         dwc3_debugfs_exit(dwc);
 569
 570         switch (dwc->mode) {
 571         case DWC3_MODE_DEVICE:
 572                 dwc3_gadget_exit(dwc);
 573                 break;
 574         case DWC3_MODE_HOST:
 575                 dwc3_host_exit(dwc);
 576                 break;
 577         case DWC3_MODE_DRD:
 578                 dwc3_host_exit(dwc);
 579                 dwc3_gadget_exit(dwc);
 580                 break;
 581         default:
 582                 /* do nothing */
 583                 break;
 584         }
 585
 586         dwc3_core_exit(dwc);
 587
 588         return 0;
 589 }
 590
 591 #ifdef CONFIG_OF
 592 static const struct of_device_id of_dwc3_match[] = {
 593         {
 594                 .compatible = "synopsys,dwc3"
 595         },
 596         { },
 597 };
 598 MODULE_DEVICE_TABLE(of, of_dwc3_match);
 599 #endif
 600
 601 static struct platform_driver dwc3_driver = {
 602         .probe          = dwc3_probe,
 603         .remove         = dwc3_remove,
 604         .driver         = {
 605                 .name   = "dwc3",
 606                 .of_match_table = of_match_ptr(of_dwc3_match),
 607         },
 608 };
 609
 610 module_platform_driver(dwc3_driver);
 611
 612 MODULE_ALIAS("platform:dwc3");
 613 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 614 MODULE_LICENSE("Dual BSD/GPL");
 615 MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver");