drivers/usb/dwc3/gadget.c

   1 /**
   2  * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
   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/kernel.h>
  40 #include <linux/delay.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/io.h>
  47 #include <linux/list.h>
  48 #include <linux/dma-mapping.h>
  49
  50 #include <linux/usb/ch9.h>
  51 #include <linux/usb/gadget.h>
  52
  53 #include "core.h"
  54 #include "gadget.h"
  55 #include "io.h"
  56
  57 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
  58
  59 void dwc3_map_buffer_to_dma(struct dwc3_request *req)
  60 {
  61         struct dwc3                     *dwc = req->dep->dwc;
  62
  63         if (req->request.length == 0) {
  64                 /* req->request.dma = dwc->setup_buf_addr; */
  65                 return;
  66         }
  67
  68         if (req->request.dma == DMA_ADDR_INVALID) {
  69                 req->request.dma = dma_map_single(dwc->dev, req->request.buf,
  70                                 req->request.length, req->direction
  71                                 ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
  72                 req->mapped = true;
  73         }
  74 }
  75
  76 void dwc3_unmap_buffer_from_dma(struct dwc3_request *req)
  77 {
  78         struct dwc3                     *dwc = req->dep->dwc;
  79
  80         if (req->request.length == 0) {
  81                 req->request.dma = DMA_ADDR_INVALID;
  82                 return;
  83         }
  84
  85         if (req->mapped) {
  86                 dma_unmap_single(dwc->dev, req->request.dma,
  87                                 req->request.length, req->direction
  88                                 ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
  89                 req->mapped = 0;
  90                 req->request.dma = DMA_ADDR_INVALID;
  91         }
  92 }
  93
  94 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
  95                 int status)
  96 {
  97         struct dwc3                     *dwc = dep->dwc;
  98
  99         if (req->queued) {
 100                 dep->busy_slot++;
 101                 /*
 102                  * Skip LINK TRB. We can't use req->trb and check for
 103                  * DWC3_TRBCTL_LINK_TRB because it points the TRB we just
 104                  * completed (not the LINK TRB).
 105                  */
 106                 if (((dep->busy_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
 107                                 usb_endpoint_xfer_isoc(dep->desc))
 108                         dep->busy_slot++;
 109         }
 110         list_del(&req->list);
 111
 112         if (req->request.status == -EINPROGRESS)
 113                 req->request.status = status;
 114
 115         dwc3_unmap_buffer_from_dma(req);
 116
 117         dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
 118                         req, dep->name, req->request.actual,
 119                         req->request.length, status);
 120
 121         spin_unlock(&dwc->lock);
 122         req->request.complete(&req->dep->endpoint, &req->request);
 123         spin_lock(&dwc->lock);
 124 }
 125
 126 static const char *dwc3_gadget_ep_cmd_string(u8 cmd)
 127 {
 128         switch (cmd) {
 129         case DWC3_DEPCMD_DEPSTARTCFG:
 130                 return "Start New Configuration";
 131         case DWC3_DEPCMD_ENDTRANSFER:
 132                 return "End Transfer";
 133         case DWC3_DEPCMD_UPDATETRANSFER:
 134                 return "Update Transfer";
 135         case DWC3_DEPCMD_STARTTRANSFER:
 136                 return "Start Transfer";
 137         case DWC3_DEPCMD_CLEARSTALL:
 138                 return "Clear Stall";
 139         case DWC3_DEPCMD_SETSTALL:
 140                 return "Set Stall";
 141         case DWC3_DEPCMD_GETSEQNUMBER:
 142                 return "Get Data Sequence Number";
 143         case DWC3_DEPCMD_SETTRANSFRESOURCE:
 144                 return "Set Endpoint Transfer Resource";
 145         case DWC3_DEPCMD_SETEPCONFIG:
 146                 return "Set Endpoint Configuration";
 147         default:
 148                 return "UNKNOWN command";
 149         }
 150 }
 151
 152 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
 153                 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
 154 {
 155         struct dwc3_ep          *dep = dwc->eps[ep];
 156         u32                     timeout = 500;
 157         u32                     reg;
 158
 159         dev_vdbg(dwc->dev, "%s: cmd '%s' params %08x %08x %08x\n",
 160                         dep->name,
 161                         dwc3_gadget_ep_cmd_string(cmd), params->param0,
 162                         params->param1, params->param2);
 163
 164         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
 165         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
 166         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
 167
 168         dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
 169         do {
 170                 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
 171                 if (!(reg & DWC3_DEPCMD_CMDACT)) {
 172                         dev_vdbg(dwc->dev, "Command Complete --> %d\n",
 173                                         DWC3_DEPCMD_STATUS(reg));
 174                         return 0;
 175                 }
 176
 177                 /*
 178                  * We can't sleep here, because it is also called from
 179                  * interrupt context.
 180                  */
 181                 timeout--;
 182                 if (!timeout)
 183                         return -ETIMEDOUT;
 184
 185                 udelay(1);
 186         } while (1);
 187 }
 188
 189 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
 190                 struct dwc3_trb_hw *trb)
 191 {
 192         u32             offset = (char *) trb - (char *) dep->trb_pool;
 193
 194         return dep->trb_pool_dma + offset;
 195 }
 196
 197 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
 198 {
 199         struct dwc3             *dwc = dep->dwc;
 200
 201         if (dep->trb_pool)
 202                 return 0;
 203
 204         if (dep->number == 0 || dep->number == 1)
 205                 return 0;
 206
 207         dep->trb_pool = dma_alloc_coherent(dwc->dev,
 208                         sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 209                         &dep->trb_pool_dma, GFP_KERNEL);
 210         if (!dep->trb_pool) {
 211                 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
 212                                 dep->name);
 213                 return -ENOMEM;
 214         }
 215
 216         return 0;
 217 }
 218
 219 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
 220 {
 221         struct dwc3             *dwc = dep->dwc;
 222
 223         dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 224                         dep->trb_pool, dep->trb_pool_dma);
 225
 226         dep->trb_pool = NULL;
 227         dep->trb_pool_dma = 0;
 228 }
 229
 230 static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
 231 {
 232         struct dwc3_gadget_ep_cmd_params params;
 233         u32                     cmd;
 234
 235         memset(&params, 0x00, sizeof(params));
 236
 237         if (dep->number != 1) {
 238                 cmd = DWC3_DEPCMD_DEPSTARTCFG;
 239                 /* XferRscIdx == 0 for ep0 and 2 for the remaining */
 240                 if (dep->number > 1) {
 241                         if (dwc->start_config_issued)
 242                                 return 0;
 243                         dwc->start_config_issued = true;
 244                         cmd |= DWC3_DEPCMD_PARAM(2);
 245                 }
 246
 247                 return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, &params);
 248         }
 249
 250         return 0;
 251 }
 252
 253 static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
 254                 const struct usb_endpoint_descriptor *desc)
 255 {
 256         struct dwc3_gadget_ep_cmd_params params;
 257
 258         memset(&params, 0x00, sizeof(params));
 259
 260         params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
 261                 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc))
 262                 | DWC3_DEPCFG_BURST_SIZE(dep->endpoint.maxburst);
 263
 264         params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
 265                 | DWC3_DEPCFG_XFER_NOT_READY_EN;
 266
 267         if (usb_endpoint_xfer_bulk(desc) && dep->endpoint.max_streams) {
 268                 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
 269                         | DWC3_DEPCFG_STREAM_EVENT_EN;
 270                 dep->stream_capable = true;
 271         }
 272
 273         if (usb_endpoint_xfer_isoc(desc))
 274                 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
 275
 276         /*
 277          * We are doing 1:1 mapping for endpoints, meaning
 278          * Physical Endpoints 2 maps to Logical Endpoint 2 and
 279          * so on. We consider the direction bit as part of the physical
 280          * endpoint number. So USB endpoint 0x81 is 0x03.
 281          */
 282         params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
 283
 284         /*
 285          * We must use the lower 16 TX FIFOs even though
 286          * HW might have more
 287          */
 288         if (dep->direction)
 289                 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
 290
 291         if (desc->bInterval) {
 292                 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
 293                 dep->interval = 1 << (desc->bInterval - 1);
 294         }
 295
 296         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 297                         DWC3_DEPCMD_SETEPCONFIG, &params);
 298 }
 299
 300 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
 301 {
 302         struct dwc3_gadget_ep_cmd_params params;
 303
 304         memset(&params, 0x00, sizeof(params));
 305
 306         params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
 307
 308         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 309                         DWC3_DEPCMD_SETTRANSFRESOURCE, &params);
 310 }
 311
 312 /**
 313  * __dwc3_gadget_ep_enable - Initializes a HW endpoint
 314  * @dep: endpoint to be initialized
 315  * @desc: USB Endpoint Descriptor
 316  *
 317  * Caller should take care of locking
 318  */
 319 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
 320                 const struct usb_endpoint_descriptor *desc)
 321 {
 322         struct dwc3             *dwc = dep->dwc;
 323         u32                     reg;
 324         int                     ret = -ENOMEM;
 325
 326         if (!(dep->flags & DWC3_EP_ENABLED)) {
 327                 ret = dwc3_gadget_start_config(dwc, dep);
 328                 if (ret)
 329                         return ret;
 330         }
 331
 332         ret = dwc3_gadget_set_ep_config(dwc, dep, desc);
 333         if (ret)
 334                 return ret;
 335
 336         if (!(dep->flags & DWC3_EP_ENABLED)) {
 337                 struct dwc3_trb_hw      *trb_st_hw;
 338                 struct dwc3_trb_hw      *trb_link_hw;
 339                 struct dwc3_trb         trb_link;
 340
 341                 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
 342                 if (ret)
 343                         return ret;
 344
 345                 dep->desc = desc;
 346                 dep->type = usb_endpoint_type(desc);
 347                 dep->flags |= DWC3_EP_ENABLED;
 348
 349                 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 350                 reg |= DWC3_DALEPENA_EP(dep->number);
 351                 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 352
 353                 if (!usb_endpoint_xfer_isoc(desc))
 354                         return 0;
 355
 356                 memset(&trb_link, 0, sizeof(trb_link));
 357
 358                 /* Link TRB for ISOC. The HWO but is never reset */
 359                 trb_st_hw = &dep->trb_pool[0];
 360
 361                 trb_link.bplh = dwc3_trb_dma_offset(dep, trb_st_hw);
 362                 trb_link.trbctl = DWC3_TRBCTL_LINK_TRB;
 363                 trb_link.hwo = true;
 364
 365                 trb_link_hw = &dep->trb_pool[DWC3_TRB_NUM - 1];
 366                 dwc3_trb_to_hw(&trb_link, trb_link_hw);
 367         }
 368
 369         return 0;
 370 }
 371
 372 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum);
 373 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 374 {
 375         struct dwc3_request             *req;
 376
 377         if (!list_empty(&dep->req_queued))
 378                 dwc3_stop_active_transfer(dwc, dep->number);
 379
 380         while (!list_empty(&dep->request_list)) {
 381                 req = next_request(&dep->request_list);
 382
 383                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 384         }
 385 }
 386
 387 /**
 388  * __dwc3_gadget_ep_disable - Disables a HW endpoint
 389  * @dep: the endpoint to disable
 390  *
 391  * This function also removes requests which are currently processed ny the
 392  * hardware and those which are not yet scheduled.
 393  * Caller should take care of locking.
 394  */
 395 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
 396 {
 397         struct dwc3             *dwc = dep->dwc;
 398         u32                     reg;
 399
 400         dwc3_remove_requests(dwc, dep);
 401
 402         reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 403         reg &= ~DWC3_DALEPENA_EP(dep->number);
 404         dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 405
 406         dep->stream_capable = false;
 407         dep->desc = NULL;
 408         dep->type = 0;
 409         dep->flags = 0;
 410
 411         return 0;
 412 }
 413
 414 /* -------------------------------------------------------------------------- */
 415
 416 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
 417                 const struct usb_endpoint_descriptor *desc)
 418 {
 419         return -EINVAL;
 420 }
 421
 422 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
 423 {
 424         return -EINVAL;
 425 }
 426
 427 /* -------------------------------------------------------------------------- */
 428
 429 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
 430                 const struct usb_endpoint_descriptor *desc)
 431 {
 432         struct dwc3_ep                  *dep;
 433         struct dwc3                     *dwc;
 434         unsigned long                   flags;
 435         int                             ret;
 436
 437         if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
 438                 pr_debug("dwc3: invalid parameters\n");
 439                 return -EINVAL;
 440         }
 441
 442         if (!desc->wMaxPacketSize) {
 443                 pr_debug("dwc3: missing wMaxPacketSize\n");
 444                 return -EINVAL;
 445         }
 446
 447         dep = to_dwc3_ep(ep);
 448         dwc = dep->dwc;
 449
 450         switch (usb_endpoint_type(desc)) {
 451         case USB_ENDPOINT_XFER_CONTROL:
 452                 strlcat(dep->name, "-control", sizeof(dep->name));
 453                 break;
 454         case USB_ENDPOINT_XFER_ISOC:
 455                 strlcat(dep->name, "-isoc", sizeof(dep->name));
 456                 break;
 457         case USB_ENDPOINT_XFER_BULK:
 458                 strlcat(dep->name, "-bulk", sizeof(dep->name));
 459                 break;
 460         case USB_ENDPOINT_XFER_INT:
 461                 strlcat(dep->name, "-int", sizeof(dep->name));
 462                 break;
 463         default:
 464                 dev_err(dwc->dev, "invalid endpoint transfer type\n");
 465         }
 466
 467         if (dep->flags & DWC3_EP_ENABLED) {
 468                 dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n",
 469                                 dep->name);
 470                 return 0;
 471         }
 472
 473         dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);
 474
 475         spin_lock_irqsave(&dwc->lock, flags);
 476         ret = __dwc3_gadget_ep_enable(dep, desc);
 477         spin_unlock_irqrestore(&dwc->lock, flags);
 478
 479         return ret;
 480 }
 481
 482 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
 483 {
 484         struct dwc3_ep                  *dep;
 485         struct dwc3                     *dwc;
 486         unsigned long                   flags;
 487         int                             ret;
 488
 489         if (!ep) {
 490                 pr_debug("dwc3: invalid parameters\n");
 491                 return -EINVAL;
 492         }
 493
 494         dep = to_dwc3_ep(ep);
 495         dwc = dep->dwc;
 496
 497         if (!(dep->flags & DWC3_EP_ENABLED)) {
 498                 dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n",
 499                                 dep->name);
 500                 return 0;
 501         }
 502
 503         snprintf(dep->name, sizeof(dep->name), "ep%d%s",
 504                         dep->number >> 1,
 505                         (dep->number & 1) ? "in" : "out");
 506
 507         spin_lock_irqsave(&dwc->lock, flags);
 508         ret = __dwc3_gadget_ep_disable(dep);
 509         spin_unlock_irqrestore(&dwc->lock, flags);
 510
 511         return ret;
 512 }
 513
 514 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
 515         gfp_t gfp_flags)
 516 {
 517         struct dwc3_request             *req;
 518         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 519         struct dwc3                     *dwc = dep->dwc;
 520
 521         req = kzalloc(sizeof(*req), gfp_flags);
 522         if (!req) {
 523                 dev_err(dwc->dev, "not enough memory\n");
 524                 return NULL;
 525         }
 526
 527         req->epnum      = dep->number;
 528         req->dep        = dep;
 529         req->request.dma = DMA_ADDR_INVALID;
 530
 531         return &req->request;
 532 }
 533
 534 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
 535                 struct usb_request *request)
 536 {
 537         struct dwc3_request             *req = to_dwc3_request(request);
 538
 539         kfree(req);
 540 }
 541
 542 /*
 543  * dwc3_prepare_trbs - setup TRBs from requests
 544  * @dep: endpoint for which requests are being prepared
 545  * @starting: true if the endpoint is idle and no requests are queued.
 546  *
 547  * The functions goes through the requests list and setups TRBs for the
 548  * transfers. The functions returns once there are not more TRBs available or
 549  * it run out of requests.
 550  */
 551 static struct dwc3_request *dwc3_prepare_trbs(struct dwc3_ep *dep,
 552                 bool starting)
 553 {
 554         struct dwc3_request     *req, *n, *ret = NULL;
 555         struct dwc3_trb_hw      *trb_hw;
 556         struct dwc3_trb         trb;
 557         u32                     trbs_left;
 558
 559         BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
 560
 561         /* the first request must not be queued */
 562         trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
 563         /*
 564          * if busy & slot are equal than it is either full or empty. If we are
 565          * starting to proceed requests then we are empty. Otherwise we ar
 566          * full and don't do anything
 567          */
 568         if (!trbs_left) {
 569                 if (!starting)
 570                         return NULL;
 571                 trbs_left = DWC3_TRB_NUM;
 572                 /*
 573                  * In case we start from scratch, we queue the ISOC requests
 574                  * starting from slot 1. This is done because we use ring
 575                  * buffer and have no LST bit to stop us. Instead, we place
 576                  * IOC bit TRB_NUM/4. We try to avoid to having an interrupt
 577                  * after the first request so we start at slot 1 and have
 578                  * 7 requests proceed before we hit the first IOC.
 579                  * Other transfer types don't use the ring buffer and are
 580                  * processed from the first TRB until the last one. Since we
 581                  * don't wrap around we have to start at the beginning.
 582                  */
 583                 if (usb_endpoint_xfer_isoc(dep->desc)) {
 584                         dep->busy_slot = 1;
 585                         dep->free_slot = 1;
 586                 } else {
 587                         dep->busy_slot = 0;
 588                         dep->free_slot = 0;
 589                 }
 590         }
 591
 592         /* The last TRB is a link TRB, not used for xfer */
 593         if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->desc))
 594                 return NULL;
 595
 596         list_for_each_entry_safe(req, n, &dep->request_list, list) {
 597                 unsigned int last_one = 0;
 598                 unsigned int cur_slot;
 599
 600                 trb_hw = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
 601                 cur_slot = dep->free_slot;
 602                 dep->free_slot++;
 603
 604                 /* Skip the LINK-TRB on ISOC */
 605                 if (((cur_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
 606                                 usb_endpoint_xfer_isoc(dep->desc))
 607                         continue;
 608
 609                 dwc3_gadget_move_request_queued(req);
 610                 memset(&trb, 0, sizeof(trb));
 611                 trbs_left--;
 612
 613                 /* Is our TRB pool empty? */
 614                 if (!trbs_left)
 615                         last_one = 1;
 616                 /* Is this the last request? */
 617                 if (list_empty(&dep->request_list))
 618                         last_one = 1;
 619
 620                 /*
 621                  * FIXME we shouldn't need to set LST bit always but we are
 622                  * facing some weird problem with the Hardware where it doesn't
 623                  * complete even though it has been previously started.
 624                  *
 625                  * While we're debugging the problem, as a workaround to
 626                  * multiple TRBs handling, use only one TRB at a time.
 627                  */
 628                 last_one = 1;
 629
 630                 req->trb = trb_hw;
 631                 if (!ret)
 632                         ret = req;
 633
 634                 trb.bplh = req->request.dma;
 635
 636                 if (usb_endpoint_xfer_isoc(dep->desc)) {
 637                         trb.isp_imi = true;
 638                         trb.csp = true;
 639                 } else {
 640                         trb.lst = last_one;
 641                 }
 642
 643                 if (usb_endpoint_xfer_bulk(dep->desc) && dep->stream_capable)
 644                         trb.sid_sofn = req->request.stream_id;
 645
 646                 switch (usb_endpoint_type(dep->desc)) {
 647                 case USB_ENDPOINT_XFER_CONTROL:
 648                         trb.trbctl = DWC3_TRBCTL_CONTROL_SETUP;
 649                         break;
 650
 651                 case USB_ENDPOINT_XFER_ISOC:
 652                         trb.trbctl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
 653
 654                         /* IOC every DWC3_TRB_NUM / 4 so we can refill */
 655                         if (!(cur_slot % (DWC3_TRB_NUM / 4)))
 656                                 trb.ioc = last_one;
 657                         break;
 658
 659                 case USB_ENDPOINT_XFER_BULK:
 660                 case USB_ENDPOINT_XFER_INT:
 661                         trb.trbctl = DWC3_TRBCTL_NORMAL;
 662                         break;
 663                 default:
 664                         /*
 665                          * This is only possible with faulty memory because we
 666                          * checked it already :)
 667                          */
 668                         BUG();
 669                 }
 670
 671                 trb.length      = req->request.length;
 672                 trb.hwo = true;
 673
 674                 dwc3_trb_to_hw(&trb, trb_hw);
 675                 req->trb_dma = dwc3_trb_dma_offset(dep, trb_hw);
 676
 677                 if (last_one)
 678                         break;
 679         }
 680
 681         return ret;
 682 }
 683
 684 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
 685                 int start_new)
 686 {
 687         struct dwc3_gadget_ep_cmd_params params;
 688         struct dwc3_request             *req;
 689         struct dwc3                     *dwc = dep->dwc;
 690         int                             ret;
 691         u32                             cmd;
 692
 693         if (start_new && (dep->flags & DWC3_EP_BUSY)) {
 694                 dev_vdbg(dwc->dev, "%s: endpoint busy\n", dep->name);
 695                 return -EBUSY;
 696         }
 697         dep->flags &= ~DWC3_EP_PENDING_REQUEST;
 698
 699         /*
 700          * If we are getting here after a short-out-packet we don't enqueue any
 701          * new requests as we try to set the IOC bit only on the last request.
 702          */
 703         if (start_new) {
 704                 if (list_empty(&dep->req_queued))
 705                         dwc3_prepare_trbs(dep, start_new);
 706
 707                 /* req points to the first request which will be sent */
 708                 req = next_request(&dep->req_queued);
 709         } else {
 710                 /*
 711                  * req points to the first request where HWO changed
 712                  * from 0 to 1
 713                  */
 714                 req = dwc3_prepare_trbs(dep, start_new);
 715         }
 716         if (!req) {
 717                 dep->flags |= DWC3_EP_PENDING_REQUEST;
 718                 return 0;
 719         }
 720
 721         memset(&params, 0, sizeof(params));
 722         params.param0 = upper_32_bits(req->trb_dma);
 723         params.param1 = lower_32_bits(req->trb_dma);
 724
 725         if (start_new)
 726                 cmd = DWC3_DEPCMD_STARTTRANSFER;
 727         else
 728                 cmd = DWC3_DEPCMD_UPDATETRANSFER;
 729
 730         cmd |= DWC3_DEPCMD_PARAM(cmd_param);
 731         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
 732         if (ret < 0) {
 733                 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
 734
 735                 /*
 736                  * FIXME we need to iterate over the list of requests
 737                  * here and stop, unmap, free and del each of the linked
 738                  * requests instead of we do now.
 739                  */
 740                 dwc3_unmap_buffer_from_dma(req);
 741                 list_del(&req->list);
 742                 return ret;
 743         }
 744
 745         dep->flags |= DWC3_EP_BUSY;
 746         dep->res_trans_idx = dwc3_gadget_ep_get_transfer_index(dwc,
 747                         dep->number);
 748         if (!dep->res_trans_idx)
 749                 printk_once(KERN_ERR "%s() res_trans_idx is invalid\n", __func__);
 750         return 0;
 751 }
 752
 753 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
 754 {
 755         req->request.actual     = 0;
 756         req->request.status     = -EINPROGRESS;
 757         req->direction          = dep->direction;
 758         req->epnum              = dep->number;
 759
 760         /*
 761          * We only add to our list of requests now and
 762          * start consuming the list once we get XferNotReady
 763          * IRQ.
 764          *
 765          * That way, we avoid doing anything that we don't need
 766          * to do now and defer it until the point we receive a
 767          * particular token from the Host side.
 768          *
 769          * This will also avoid Host cancelling URBs due to too
 770          * many NACKs.
 771          */
 772         dwc3_map_buffer_to_dma(req);
 773         list_add_tail(&req->list, &dep->request_list);
 774
 775         /*
 776          * There is one special case: XferNotReady with
 777          * empty list of requests. We need to kick the
 778          * transfer here in that situation, otherwise
 779          * we will be NAKing forever.
 780          *
 781          * If we get XferNotReady before gadget driver
 782          * has a chance to queue a request, we will ACK
 783          * the IRQ but won't be able to receive the data
 784          * until the next request is queued. The following
 785          * code is handling exactly that.
 786          */
 787         if (dep->flags & DWC3_EP_PENDING_REQUEST) {
 788                 int ret;
 789                 int start_trans;
 790
 791                 start_trans = 1;
 792                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
 793                                 dep->flags & DWC3_EP_BUSY)
 794                         start_trans = 0;
 795
 796                 ret =  __dwc3_gadget_kick_transfer(dep, 0, start_trans);
 797                 if (ret && ret != -EBUSY) {
 798                         struct dwc3     *dwc = dep->dwc;
 799
 800                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
 801                                         dep->name);
 802                 }
 803         };
 804
 805         return 0;
 806 }
 807
 808 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
 809         gfp_t gfp_flags)
 810 {
 811         struct dwc3_request             *req = to_dwc3_request(request);
 812         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 813         struct dwc3                     *dwc = dep->dwc;
 814
 815         unsigned long                   flags;
 816
 817         int                             ret;
 818
 819         if (!dep->desc) {
 820                 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
 821                                 request, ep->name);
 822                 return -ESHUTDOWN;
 823         }
 824
 825         dev_vdbg(dwc->dev, "queing request %p to %s length %d\n",
 826                         request, ep->name, request->length);
 827
 828         spin_lock_irqsave(&dwc->lock, flags);
 829         ret = __dwc3_gadget_ep_queue(dep, req);
 830         spin_unlock_irqrestore(&dwc->lock, flags);
 831
 832         return ret;
 833 }
 834
 835 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
 836                 struct usb_request *request)
 837 {
 838         struct dwc3_request             *req = to_dwc3_request(request);
 839         struct dwc3_request             *r = NULL;
 840
 841         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 842         struct dwc3                     *dwc = dep->dwc;
 843
 844         unsigned long                   flags;
 845         int                             ret = 0;
 846
 847         spin_lock_irqsave(&dwc->lock, flags);
 848
 849         list_for_each_entry(r, &dep->request_list, list) {
 850                 if (r == req)
 851                         break;
 852         }
 853
 854         if (r != req) {
 855                 list_for_each_entry(r, &dep->req_queued, list) {
 856                         if (r == req)
 857                                 break;
 858                 }
 859                 if (r == req) {
 860                         /* wait until it is processed */
 861                         dwc3_stop_active_transfer(dwc, dep->number);
 862                         goto out0;
 863                 }
 864                 dev_err(dwc->dev, "request %p was not queued to %s\n",
 865                                 request, ep->name);
 866                 ret = -EINVAL;
 867                 goto out0;
 868         }
 869
 870         /* giveback the request */
 871         dwc3_gadget_giveback(dep, req, -ECONNRESET);
 872
 873 out0:
 874         spin_unlock_irqrestore(&dwc->lock, flags);
 875
 876         return ret;
 877 }
 878
 879 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
 880 {
 881         struct dwc3_gadget_ep_cmd_params        params;
 882         struct dwc3                             *dwc = dep->dwc;
 883         int                                     ret;
 884
 885         memset(&params, 0x00, sizeof(params));
 886
 887         if (value) {
 888                 if (dep->number == 0 || dep->number == 1) {
 889                         /*
 890                          * Whenever EP0 is stalled, we will restart
 891                          * the state machine, thus moving back to
 892                          * Setup Phase
 893                          */
 894                         dwc->ep0state = EP0_SETUP_PHASE;
 895                 }
 896
 897                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
 898                         DWC3_DEPCMD_SETSTALL, &params);
 899                 if (ret)
 900                         dev_err(dwc->dev, "failed to %s STALL on %s\n",
 901                                         value ? "set" : "clear",
 902                                         dep->name);
 903                 else
 904                         dep->flags |= DWC3_EP_STALL;
 905         } else {
 906                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
 907                         DWC3_DEPCMD_CLEARSTALL, &params);
 908                 if (ret)
 909                         dev_err(dwc->dev, "failed to %s STALL on %s\n",
 910                                         value ? "set" : "clear",
 911                                         dep->name);
 912                 else
 913                         dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
 914         }
 915
 916         return ret;
 917 }
 918
 919 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
 920 {
 921         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 922         struct dwc3                     *dwc = dep->dwc;
 923
 924         unsigned long                   flags;
 925
 926         int                             ret;
 927
 928         spin_lock_irqsave(&dwc->lock, flags);
 929
 930         if (usb_endpoint_xfer_isoc(dep->desc)) {
 931                 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
 932                 ret = -EINVAL;
 933                 goto out;
 934         }
 935
 936         ret = __dwc3_gadget_ep_set_halt(dep, value);
 937 out:
 938         spin_unlock_irqrestore(&dwc->lock, flags);
 939
 940         return ret;
 941 }
 942
 943 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
 944 {
 945         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 946
 947         dep->flags |= DWC3_EP_WEDGE;
 948
 949         return dwc3_gadget_ep_set_halt(ep, 1);
 950 }
 951
 952 /* -------------------------------------------------------------------------- */
 953
 954 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
 955         .bLength        = USB_DT_ENDPOINT_SIZE,
 956         .bDescriptorType = USB_DT_ENDPOINT,
 957         .bmAttributes   = USB_ENDPOINT_XFER_CONTROL,
 958 };
 959
 960 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
 961         .enable         = dwc3_gadget_ep0_enable,
 962         .disable        = dwc3_gadget_ep0_disable,
 963         .alloc_request  = dwc3_gadget_ep_alloc_request,
 964         .free_request   = dwc3_gadget_ep_free_request,
 965         .queue          = dwc3_gadget_ep0_queue,
 966         .dequeue        = dwc3_gadget_ep_dequeue,
 967         .set_halt       = dwc3_gadget_ep_set_halt,
 968         .set_wedge      = dwc3_gadget_ep_set_wedge,
 969 };
 970
 971 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
 972         .enable         = dwc3_gadget_ep_enable,
 973         .disable        = dwc3_gadget_ep_disable,
 974         .alloc_request  = dwc3_gadget_ep_alloc_request,
 975         .free_request   = dwc3_gadget_ep_free_request,
 976         .queue          = dwc3_gadget_ep_queue,
 977         .dequeue        = dwc3_gadget_ep_dequeue,
 978         .set_halt       = dwc3_gadget_ep_set_halt,
 979         .set_wedge      = dwc3_gadget_ep_set_wedge,
 980 };
 981
 982 /* -------------------------------------------------------------------------- */
 983
 984 static int dwc3_gadget_get_frame(struct usb_gadget *g)
 985 {
 986         struct dwc3             *dwc = gadget_to_dwc(g);
 987         u32                     reg;
 988
 989         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 990         return DWC3_DSTS_SOFFN(reg);
 991 }
 992
 993 static int dwc3_gadget_wakeup(struct usb_gadget *g)
 994 {
 995         struct dwc3             *dwc = gadget_to_dwc(g);
 996
 997         unsigned long           timeout;
 998         unsigned long           flags;
 999
1000         u32                     reg;
1001
1002         int                     ret = 0;
1003
1004         u8                      link_state;
1005         u8                      speed;
1006
1007         spin_lock_irqsave(&dwc->lock, flags);
1008
1009         /*
1010          * According to the Databook Remote wakeup request should
1011          * be issued only when the device is in early suspend state.
1012          *
1013          * We can check that via USB Link State bits in DSTS register.
1014          */
1015         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1016
1017         speed = reg & DWC3_DSTS_CONNECTSPD;
1018         if (speed == DWC3_DSTS_SUPERSPEED) {
1019                 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n");
1020                 ret = -EINVAL;
1021                 goto out;
1022         }
1023
1024         link_state = DWC3_DSTS_USBLNKST(reg);
1025
1026         switch (link_state) {
1027         case DWC3_LINK_STATE_RX_DET:    /* in HS, means Early Suspend */
1028         case DWC3_LINK_STATE_U3:        /* in HS, means SUSPEND */
1029                 break;
1030         default:
1031                 dev_dbg(dwc->dev, "can't wakeup from link state %d\n",
1032                                 link_state);
1033                 ret = -EINVAL;
1034                 goto out;
1035         }
1036
1037         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1038
1039         /*
1040          * Switch link state to Recovery. In HS/FS/LS this means
1041          * RemoteWakeup Request
1042          */
1043         reg |= DWC3_DCTL_ULSTCHNG_RECOVERY;
1044         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1045
1046         /* wait for at least 2000us */
1047         usleep_range(2000, 2500);
1048
1049         /* write zeroes to Link Change Request */
1050         reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1051         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1052
1053         /* pool until Link State change to ON */
1054         timeout = jiffies + msecs_to_jiffies(100);
1055
1056         while (!(time_after(jiffies, timeout))) {
1057                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1058
1059                 /* in HS, means ON */
1060                 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1061                         break;
1062         }
1063
1064         if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1065                 dev_err(dwc->dev, "failed to send remote wakeup\n");
1066                 ret = -EINVAL;
1067         }
1068
1069 out:
1070         spin_unlock_irqrestore(&dwc->lock, flags);
1071
1072         return ret;
1073 }
1074
1075 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1076                 int is_selfpowered)
1077 {
1078         struct dwc3             *dwc = gadget_to_dwc(g);
1079
1080         dwc->is_selfpowered = !!is_selfpowered;
1081
1082         return 0;
1083 }
1084
1085 static void dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on)
1086 {
1087         u32                     reg;
1088         u32                     timeout = 500;
1089
1090         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1091         if (is_on)
1092                 reg |= DWC3_DCTL_RUN_STOP;
1093         else
1094                 reg &= ~DWC3_DCTL_RUN_STOP;
1095
1096         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1097
1098         do {
1099                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1100                 if (is_on) {
1101                         if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1102                                 break;
1103                 } else {
1104                         if (reg & DWC3_DSTS_DEVCTRLHLT)
1105                                 break;
1106                 }
1107                 timeout--;
1108                 if (!timeout)
1109                         break;
1110                 udelay(1);
1111         } while (1);
1112
1113         dev_vdbg(dwc->dev, "gadget %s data soft-%s\n",
1114                         dwc->gadget_driver
1115                         ? dwc->gadget_driver->function : "no-function",
1116                         is_on ? "connect" : "disconnect");
1117 }
1118
1119 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1120 {
1121         struct dwc3             *dwc = gadget_to_dwc(g);
1122         unsigned long           flags;
1123
1124         is_on = !!is_on;
1125
1126         spin_lock_irqsave(&dwc->lock, flags);
1127         dwc3_gadget_run_stop(dwc, is_on);
1128         spin_unlock_irqrestore(&dwc->lock, flags);
1129
1130         return 0;
1131 }
1132
1133 static int dwc3_gadget_start(struct usb_gadget *g,
1134                 struct usb_gadget_driver *driver)
1135 {
1136         struct dwc3             *dwc = gadget_to_dwc(g);
1137         struct dwc3_ep          *dep;
1138         unsigned long           flags;
1139         int                     ret = 0;
1140         u32                     reg;
1141
1142         spin_lock_irqsave(&dwc->lock, flags);
1143
1144         if (dwc->gadget_driver) {
1145                 dev_err(dwc->dev, "%s is already bound to %s\n",
1146                                 dwc->gadget.name,
1147                                 dwc->gadget_driver->driver.name);
1148                 ret = -EBUSY;
1149                 goto err0;
1150         }
1151
1152         dwc->gadget_driver      = driver;
1153         dwc->gadget.dev.driver  = &driver->driver;
1154
1155         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
1156
1157         reg &= ~DWC3_GCTL_SCALEDOWN(3);
1158         reg &= ~DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG);
1159         reg &= ~DWC3_GCTL_DISSCRAMBLE;
1160         reg |= DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_DEVICE);
1161
1162         switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams0)) {
1163         case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
1164                 reg &= ~DWC3_GCTL_DSBLCLKGTNG;
1165                 break;
1166         default:
1167                 dev_dbg(dwc->dev, "No power optimization available\n");
1168         }
1169
1170         /*
1171          * WORKAROUND: DWC3 revisions <1.90a have a bug
1172          * when The device fails to connect at SuperSpeed
1173          * and falls back to high-speed mode which causes
1174          * the device to enter in a Connect/Disconnect loop
1175          */
1176         if (dwc->revision < DWC3_REVISION_190A)
1177                 reg |= DWC3_GCTL_U2RSTECN;
1178
1179         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
1180
1181         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1182         reg &= ~(DWC3_DCFG_SPEED_MASK);
1183         reg |= DWC3_DCFG_SUPERSPEED;
1184         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1185
1186         dwc->start_config_issued = false;
1187
1188         /* Start with SuperSpeed Default */
1189         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1190
1191         dep = dwc->eps[0];
1192         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc);
1193         if (ret) {
1194                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1195                 goto err0;
1196         }
1197
1198         dep = dwc->eps[1];
1199         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc);
1200         if (ret) {
1201                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1202                 goto err1;
1203         }
1204
1205         /* begin to receive SETUP packets */
1206         dwc->ep0state = EP0_SETUP_PHASE;
1207         dwc3_ep0_out_start(dwc);
1208
1209         spin_unlock_irqrestore(&dwc->lock, flags);
1210
1211         return 0;
1212
1213 err1:
1214         __dwc3_gadget_ep_disable(dwc->eps[0]);
1215
1216 err0:
1217         dwc->gadget_driver = NULL;
1218         spin_unlock_irqrestore(&dwc->lock, flags);
1219
1220         return ret;
1221 }
1222
1223 static int dwc3_gadget_stop(struct usb_gadget *g,
1224                 struct usb_gadget_driver *driver)
1225 {
1226         struct dwc3             *dwc = gadget_to_dwc(g);
1227         unsigned long           flags;
1228
1229         spin_lock_irqsave(&dwc->lock, flags);
1230
1231         __dwc3_gadget_ep_disable(dwc->eps[0]);
1232         __dwc3_gadget_ep_disable(dwc->eps[1]);
1233
1234         dwc->gadget_driver      = NULL;
1235         dwc->gadget.dev.driver  = NULL;
1236
1237         spin_unlock_irqrestore(&dwc->lock, flags);
1238
1239         return 0;
1240 }
1241 static const struct usb_gadget_ops dwc3_gadget_ops = {
1242         .get_frame              = dwc3_gadget_get_frame,
1243         .wakeup                 = dwc3_gadget_wakeup,
1244         .set_selfpowered        = dwc3_gadget_set_selfpowered,
1245         .pullup                 = dwc3_gadget_pullup,
1246         .udc_start              = dwc3_gadget_start,
1247         .udc_stop               = dwc3_gadget_stop,
1248 };
1249
1250 /* -------------------------------------------------------------------------- */
1251
1252 static int __devinit dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1253 {
1254         struct dwc3_ep                  *dep;
1255         u8                              epnum;
1256
1257         INIT_LIST_HEAD(&dwc->gadget.ep_list);
1258
1259         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1260                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1261                 if (!dep) {
1262                         dev_err(dwc->dev, "can't allocate endpoint %d\n",
1263                                         epnum);
1264                         return -ENOMEM;
1265                 }
1266
1267                 dep->dwc = dwc;
1268                 dep->number = epnum;
1269                 dwc->eps[epnum] = dep;
1270
1271                 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1272                                 (epnum & 1) ? "in" : "out");
1273                 dep->endpoint.name = dep->name;
1274                 dep->direction = (epnum & 1);
1275
1276                 if (epnum == 0 || epnum == 1) {
1277                         dep->endpoint.maxpacket = 512;
1278                         dep->endpoint.maxburst = 1;
1279                         dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1280                         if (!epnum)
1281                                 dwc->gadget.ep0 = &dep->endpoint;
1282                 } else {
1283                         int             ret;
1284
1285                         dep->endpoint.maxpacket = 1024;
1286                         dep->endpoint.max_streams = 15;
1287                         dep->endpoint.ops = &dwc3_gadget_ep_ops;
1288                         list_add_tail(&dep->endpoint.ep_list,
1289                                         &dwc->gadget.ep_list);
1290
1291                         ret = dwc3_alloc_trb_pool(dep);
1292                         if (ret) {
1293                                 dev_err(dwc->dev, "%s: failed to allocate TRB pool\n", dep->name);
1294                                 return ret;
1295                         }
1296                 }
1297                 INIT_LIST_HEAD(&dep->request_list);
1298                 INIT_LIST_HEAD(&dep->req_queued);
1299         }
1300
1301         return 0;
1302 }
1303
1304 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1305 {
1306         struct dwc3_ep                  *dep;
1307         u8                              epnum;
1308
1309         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1310                 dep = dwc->eps[epnum];
1311                 /*
1312                  * Physical endpoints 0 and 1 are special; they form the
1313                  * bi-directional USB endpoint 0.
1314                  *
1315                  * For those two physical endpoints, we don't allocate a TRB
1316                  * pool nor do we add them the endpoints list. Due to that, we
1317                  * shouldn't do these two operations otherwise we would end up
1318                  * with all sorts of bugs when removing dwc3.ko.
1319                  */
1320                 if (epnum != 0 && epnum != 1) {
1321                         dwc3_free_trb_pool(dep);
1322                         list_del(&dep->endpoint.ep_list);
1323                 }
1324
1325                 kfree(dep);
1326         }
1327 }
1328
1329 static void dwc3_gadget_release(struct device *dev)
1330 {
1331         dev_dbg(dev, "%s\n", __func__);
1332 }
1333
1334 /* -------------------------------------------------------------------------- */
1335 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1336                 const struct dwc3_event_depevt *event, int status)
1337 {
1338         struct dwc3_request     *req;
1339         struct dwc3_trb         trb;
1340         unsigned int            count;
1341         unsigned int            s_pkt = 0;
1342
1343         do {
1344                 req = next_request(&dep->req_queued);
1345                 if (!req)
1346                         break;
1347
1348                 dwc3_trb_to_nat(req->trb, &trb);
1349
1350                 if (trb.hwo && status != -ESHUTDOWN)
1351                         /*
1352                          * We continue despite the error. There is not much we
1353                          * can do. If we don't clean in up we loop for ever. If
1354                          * we skip the TRB than it gets overwritten reused after
1355                          * a while since we use them in a ring buffer. a BUG()
1356                          * would help. Lets hope that if this occures, someone
1357                          * fixes the root cause instead of looking away :)
1358                          */
1359                         dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1360                                         dep->name, req->trb);
1361                 count = trb.length;
1362
1363                 if (dep->direction) {
1364                         if (count) {
1365                                 dev_err(dwc->dev, "incomplete IN transfer %s\n",
1366                                                 dep->name);
1367                                 status = -ECONNRESET;
1368                         }
1369                 } else {
1370                         if (count && (event->status & DEPEVT_STATUS_SHORT))
1371                                 s_pkt = 1;
1372                 }
1373
1374                 /*
1375                  * We assume here we will always receive the entire data block
1376                  * which we should receive. Meaning, if we program RX to
1377                  * receive 4K but we receive only 2K, we assume that's all we
1378                  * should receive and we simply bounce the request back to the
1379                  * gadget driver for further processing.
1380                  */
1381                 req->request.actual += req->request.length - count;
1382                 dwc3_gadget_giveback(dep, req, status);
1383                 if (s_pkt)
1384                         break;
1385                 if ((event->status & DEPEVT_STATUS_LST) && trb.lst)
1386                         break;
1387                 if ((event->status & DEPEVT_STATUS_IOC) && trb.ioc)
1388                         break;
1389         } while (1);
1390
1391         if ((event->status & DEPEVT_STATUS_IOC) && trb.ioc)
1392                 return 0;
1393         return 1;
1394 }
1395
1396 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
1397                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event,
1398                 int start_new)
1399 {
1400         unsigned                status = 0;
1401         int                     clean_busy;
1402
1403         if (event->status & DEPEVT_STATUS_BUSERR)
1404                 status = -ECONNRESET;
1405
1406         clean_busy =  dwc3_cleanup_done_reqs(dwc, dep, event, status);
1407         if (clean_busy) {
1408                 dep->flags &= ~DWC3_EP_BUSY;
1409                 dep->res_trans_idx = 0;
1410         }
1411 }
1412
1413 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1414                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1415 {
1416         u32 uf, mask;
1417
1418         if (list_empty(&dep->request_list)) {
1419                 dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n",
1420                         dep->name);
1421                 return;
1422         }
1423
1424         mask = ~(dep->interval - 1);
1425         uf = event->parameters & mask;
1426         /* 4 micro frames in the future */
1427         uf += dep->interval * 4;
1428
1429         __dwc3_gadget_kick_transfer(dep, uf, 1);
1430 }
1431
1432 static void dwc3_process_ep_cmd_complete(struct dwc3_ep *dep,
1433                 const struct dwc3_event_depevt *event)
1434 {
1435         struct dwc3 *dwc = dep->dwc;
1436         struct dwc3_event_depevt mod_ev = *event;
1437
1438         /*
1439          * We were asked to remove one requests. It is possible that this
1440          * request and a few other were started together and have the same
1441          * transfer index. Since we stopped the complete endpoint we don't
1442          * know how many requests were already completed (and not yet)
1443          * reported and how could be done (later). We purge them all until
1444          * the end of the list.
1445          */
1446         mod_ev.status = DEPEVT_STATUS_LST;
1447         dwc3_cleanup_done_reqs(dwc, dep, &mod_ev, -ESHUTDOWN);
1448         dep->flags &= ~DWC3_EP_BUSY;
1449         /* pending requets are ignored and are queued on XferNotReady */
1450 }
1451
1452 static void dwc3_ep_cmd_compl(struct dwc3_ep *dep,
1453                 const struct dwc3_event_depevt *event)
1454 {
1455         u32 param = event->parameters;
1456         u32 cmd_type = (param >> 8) & ((1 << 5) - 1);
1457
1458         switch (cmd_type) {
1459         case DWC3_DEPCMD_ENDTRANSFER:
1460                 dwc3_process_ep_cmd_complete(dep, event);
1461                 break;
1462         case DWC3_DEPCMD_STARTTRANSFER:
1463                 dep->res_trans_idx = param & 0x7f;
1464                 break;
1465         default:
1466                 printk(KERN_ERR "%s() unknown /unexpected type: %d\n",
1467                                 __func__, cmd_type);
1468                 break;
1469         };
1470 }
1471
1472 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
1473                 const struct dwc3_event_depevt *event)
1474 {
1475         struct dwc3_ep          *dep;
1476         u8                      epnum = event->endpoint_number;
1477
1478         dep = dwc->eps[epnum];
1479
1480         dev_vdbg(dwc->dev, "%s: %s\n", dep->name,
1481                         dwc3_ep_event_string(event->endpoint_event));
1482
1483         if (epnum == 0 || epnum == 1) {
1484                 dwc3_ep0_interrupt(dwc, event);
1485                 return;
1486         }
1487
1488         switch (event->endpoint_event) {
1489         case DWC3_DEPEVT_XFERCOMPLETE:
1490                 if (usb_endpoint_xfer_isoc(dep->desc)) {
1491                         dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n",
1492                                         dep->name);
1493                         return;
1494                 }
1495
1496                 dwc3_endpoint_transfer_complete(dwc, dep, event, 1);
1497                 break;
1498         case DWC3_DEPEVT_XFERINPROGRESS:
1499                 if (!usb_endpoint_xfer_isoc(dep->desc)) {
1500                         dev_dbg(dwc->dev, "%s is not an Isochronous endpoint\n",
1501                                         dep->name);
1502                         return;
1503                 }
1504
1505                 dwc3_endpoint_transfer_complete(dwc, dep, event, 0);
1506                 break;
1507         case DWC3_DEPEVT_XFERNOTREADY:
1508                 if (usb_endpoint_xfer_isoc(dep->desc)) {
1509                         dwc3_gadget_start_isoc(dwc, dep, event);
1510                 } else {
1511                         int ret;
1512
1513                         dev_vdbg(dwc->dev, "%s: reason %s\n",
1514                                         dep->name, event->status
1515                                         ? "Transfer Active"
1516                                         : "Transfer Not Active");
1517
1518                         ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
1519                         if (!ret || ret == -EBUSY)
1520                                 return;
1521
1522                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1523                                         dep->name);
1524                 }
1525
1526                 break;
1527         case DWC3_DEPEVT_STREAMEVT:
1528                 if (!usb_endpoint_xfer_bulk(dep->desc)) {
1529                         dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
1530                                         dep->name);
1531                         return;
1532                 }
1533
1534                 switch (event->status) {
1535                 case DEPEVT_STREAMEVT_FOUND:
1536                         dev_vdbg(dwc->dev, "Stream %d found and started\n",
1537                                         event->parameters);
1538
1539                         break;
1540                 case DEPEVT_STREAMEVT_NOTFOUND:
1541                         /* FALLTHROUGH */
1542                 default:
1543                         dev_dbg(dwc->dev, "Couldn't find suitable stream\n");
1544                 }
1545                 break;
1546         case DWC3_DEPEVT_RXTXFIFOEVT:
1547                 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name);
1548                 break;
1549         case DWC3_DEPEVT_EPCMDCMPLT:
1550                 dwc3_ep_cmd_compl(dep, event);
1551                 break;
1552         }
1553 }
1554
1555 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
1556 {
1557         if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
1558                 spin_unlock(&dwc->lock);
1559                 dwc->gadget_driver->disconnect(&dwc->gadget);
1560                 spin_lock(&dwc->lock);
1561         }
1562 }
1563
1564 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum)
1565 {
1566         struct dwc3_ep *dep;
1567         struct dwc3_gadget_ep_cmd_params params;
1568         u32 cmd;
1569         int ret;
1570
1571         dep = dwc->eps[epnum];
1572
1573         WARN_ON(!dep->res_trans_idx);
1574         if (dep->res_trans_idx) {
1575                 cmd = DWC3_DEPCMD_ENDTRANSFER;
1576                 cmd |= DWC3_DEPCMD_HIPRI_FORCERM | DWC3_DEPCMD_CMDIOC;
1577                 cmd |= DWC3_DEPCMD_PARAM(dep->res_trans_idx);
1578                 memset(&params, 0, sizeof(params));
1579                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
1580                 WARN_ON_ONCE(ret);
1581                 dep->res_trans_idx = 0;
1582         }
1583 }
1584
1585 static void dwc3_stop_active_transfers(struct dwc3 *dwc)
1586 {
1587         u32 epnum;
1588
1589         for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1590                 struct dwc3_ep *dep;
1591
1592                 dep = dwc->eps[epnum];
1593                 if (!(dep->flags & DWC3_EP_ENABLED))
1594                         continue;
1595
1596                 dwc3_remove_requests(dwc, dep);
1597         }
1598 }
1599
1600 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
1601 {
1602         u32 epnum;
1603
1604         for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1605                 struct dwc3_ep *dep;
1606                 struct dwc3_gadget_ep_cmd_params params;
1607                 int ret;
1608
1609                 dep = dwc->eps[epnum];
1610
1611                 if (!(dep->flags & DWC3_EP_STALL))
1612                         continue;
1613
1614                 dep->flags &= ~DWC3_EP_STALL;
1615
1616                 memset(&params, 0, sizeof(params));
1617                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1618                                 DWC3_DEPCMD_CLEARSTALL, &params);
1619                 WARN_ON_ONCE(ret);
1620         }
1621 }
1622
1623 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
1624 {
1625         dev_vdbg(dwc->dev, "%s\n", __func__);
1626 #if 0
1627         XXX
1628         U1/U2 is powersave optimization. Skip it for now. Anyway we need to
1629         enable it before we can disable it.
1630
1631         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1632         reg &= ~DWC3_DCTL_INITU1ENA;
1633         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1634
1635         reg &= ~DWC3_DCTL_INITU2ENA;
1636         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1637 #endif
1638
1639         dwc3_stop_active_transfers(dwc);
1640         dwc3_disconnect_gadget(dwc);
1641         dwc->start_config_issued = false;
1642
1643         dwc->gadget.speed = USB_SPEED_UNKNOWN;
1644 }
1645
1646 static void dwc3_gadget_usb3_phy_power(struct dwc3 *dwc, int on)
1647 {
1648         u32                     reg;
1649
1650         reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
1651
1652         if (on)
1653                 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
1654         else
1655                 reg |= DWC3_GUSB3PIPECTL_SUSPHY;
1656
1657         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
1658 }
1659
1660 static void dwc3_gadget_usb2_phy_power(struct dwc3 *dwc, int on)
1661 {
1662         u32                     reg;
1663
1664         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
1665
1666         if (on)
1667                 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
1668         else
1669                 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
1670
1671         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
1672 }
1673
1674 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
1675 {
1676         u32                     reg;
1677
1678         dev_vdbg(dwc->dev, "%s\n", __func__);
1679
1680         /* Enable PHYs */
1681         dwc3_gadget_usb2_phy_power(dwc, true);
1682         dwc3_gadget_usb3_phy_power(dwc, true);
1683
1684         if (dwc->gadget.speed != USB_SPEED_UNKNOWN)
1685                 dwc3_disconnect_gadget(dwc);
1686
1687         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1688         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
1689         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1690
1691         dwc3_stop_active_transfers(dwc);
1692         dwc3_clear_stall_all_ep(dwc);
1693         dwc->start_config_issued = false;
1694
1695         /* Reset device address to zero */
1696         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1697         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
1698         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1699 }
1700
1701 static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
1702 {
1703         u32 reg;
1704         u32 usb30_clock = DWC3_GCTL_CLK_BUS;
1705
1706         /*
1707          * We change the clock only at SS but I dunno why I would want to do
1708          * this. Maybe it becomes part of the power saving plan.
1709          */
1710
1711         if (speed != DWC3_DSTS_SUPERSPEED)
1712                 return;
1713
1714         /*
1715          * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
1716          * each time on Connect Done.
1717          */
1718         if (!usb30_clock)
1719                 return;
1720
1721         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
1722         reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
1723         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
1724 }
1725
1726 static void dwc3_gadget_disable_phy(struct dwc3 *dwc, u8 speed)
1727 {
1728         switch (speed) {
1729         case USB_SPEED_SUPER:
1730                 dwc3_gadget_usb2_phy_power(dwc, false);
1731                 break;
1732         case USB_SPEED_HIGH:
1733         case USB_SPEED_FULL:
1734         case USB_SPEED_LOW:
1735                 dwc3_gadget_usb3_phy_power(dwc, false);
1736                 break;
1737         }
1738 }
1739
1740 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
1741 {
1742         struct dwc3_gadget_ep_cmd_params params;
1743         struct dwc3_ep          *dep;
1744         int                     ret;
1745         u32                     reg;
1746         u8                      speed;
1747
1748         dev_vdbg(dwc->dev, "%s\n", __func__);
1749
1750         memset(&params, 0x00, sizeof(params));
1751
1752         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1753         speed = reg & DWC3_DSTS_CONNECTSPD;
1754         dwc->speed = speed;
1755
1756         dwc3_update_ram_clk_sel(dwc, speed);
1757
1758         switch (speed) {
1759         case DWC3_DCFG_SUPERSPEED:
1760                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1761                 dwc->gadget.ep0->maxpacket = 512;
1762                 dwc->gadget.speed = USB_SPEED_SUPER;
1763                 break;
1764         case DWC3_DCFG_HIGHSPEED:
1765                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
1766                 dwc->gadget.ep0->maxpacket = 64;
1767                 dwc->gadget.speed = USB_SPEED_HIGH;
1768                 break;
1769         case DWC3_DCFG_FULLSPEED2:
1770         case DWC3_DCFG_FULLSPEED1:
1771                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
1772                 dwc->gadget.ep0->maxpacket = 64;
1773                 dwc->gadget.speed = USB_SPEED_FULL;
1774                 break;
1775         case DWC3_DCFG_LOWSPEED:
1776                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
1777                 dwc->gadget.ep0->maxpacket = 8;
1778                 dwc->gadget.speed = USB_SPEED_LOW;
1779                 break;
1780         }
1781
1782         /* Disable unneded PHY */
1783         dwc3_gadget_disable_phy(dwc, dwc->gadget.speed);
1784
1785         dep = dwc->eps[0];
1786         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc);
1787         if (ret) {
1788                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1789                 return;
1790         }
1791
1792         dep = dwc->eps[1];
1793         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc);
1794         if (ret) {
1795                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1796                 return;
1797         }
1798
1799         /*
1800          * Configure PHY via GUSB3PIPECTLn if required.
1801          *
1802          * Update GTXFIFOSIZn
1803          *
1804          * In both cases reset values should be sufficient.
1805          */
1806 }
1807
1808 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
1809 {
1810         dev_vdbg(dwc->dev, "%s\n", __func__);
1811
1812         /*
1813          * TODO take core out of low power mode when that's
1814          * implemented.
1815          */
1816
1817         dwc->gadget_driver->resume(&dwc->gadget);
1818 }
1819
1820 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
1821                 unsigned int evtinfo)
1822 {
1823         /*  The fith bit says SuperSpeed yes or no. */
1824         dwc->link_state = evtinfo & DWC3_LINK_STATE_MASK;
1825
1826         dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state);
1827 }
1828
1829 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
1830                 const struct dwc3_event_devt *event)
1831 {
1832         switch (event->type) {
1833         case DWC3_DEVICE_EVENT_DISCONNECT:
1834                 dwc3_gadget_disconnect_interrupt(dwc);
1835                 break;
1836         case DWC3_DEVICE_EVENT_RESET:
1837                 dwc3_gadget_reset_interrupt(dwc);
1838                 break;
1839         case DWC3_DEVICE_EVENT_CONNECT_DONE:
1840                 dwc3_gadget_conndone_interrupt(dwc);
1841                 break;
1842         case DWC3_DEVICE_EVENT_WAKEUP:
1843                 dwc3_gadget_wakeup_interrupt(dwc);
1844                 break;
1845         case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
1846                 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
1847                 break;
1848         case DWC3_DEVICE_EVENT_EOPF:
1849                 dev_vdbg(dwc->dev, "End of Periodic Frame\n");
1850                 break;
1851         case DWC3_DEVICE_EVENT_SOF:
1852                 dev_vdbg(dwc->dev, "Start of Periodic Frame\n");
1853                 break;
1854         case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
1855                 dev_vdbg(dwc->dev, "Erratic Error\n");
1856                 break;
1857         case DWC3_DEVICE_EVENT_CMD_CMPL:
1858                 dev_vdbg(dwc->dev, "Command Complete\n");
1859                 break;
1860         case DWC3_DEVICE_EVENT_OVERFLOW:
1861                 dev_vdbg(dwc->dev, "Overflow\n");
1862                 break;
1863         default:
1864                 dev_dbg(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
1865         }
1866 }
1867
1868 static void dwc3_process_event_entry(struct dwc3 *dwc,
1869                 const union dwc3_event *event)
1870 {
1871         /* Endpoint IRQ, handle it and return early */
1872         if (event->type.is_devspec == 0) {
1873                 /* depevt */
1874                 return dwc3_endpoint_interrupt(dwc, &event->depevt);
1875         }
1876
1877         switch (event->type.type) {
1878         case DWC3_EVENT_TYPE_DEV:
1879                 dwc3_gadget_interrupt(dwc, &event->devt);
1880                 break;
1881         /* REVISIT what to do with Carkit and I2C events ? */
1882         default:
1883                 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
1884         }
1885 }
1886
1887 static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
1888 {
1889         struct dwc3_event_buffer *evt;
1890         int left;
1891         u32 count;
1892
1893         count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
1894         count &= DWC3_GEVNTCOUNT_MASK;
1895         if (!count)
1896                 return IRQ_NONE;
1897
1898         evt = dwc->ev_buffs[buf];
1899         left = count;
1900
1901         while (left > 0) {
1902                 union dwc3_event event;
1903
1904                 memcpy(&event.raw, (evt->buf + evt->lpos), sizeof(event.raw));
1905                 dwc3_process_event_entry(dwc, &event);
1906                 /*
1907                  * XXX we wrap around correctly to the next entry as almost all
1908                  * entries are 4 bytes in size. There is one entry which has 12
1909                  * bytes which is a regular entry followed by 8 bytes data. ATM
1910                  * I don't know how things are organized if were get next to the
1911                  * a boundary so I worry about that once we try to handle that.
1912                  */
1913                 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
1914                 left -= 4;
1915
1916                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4);
1917         }
1918
1919         return IRQ_HANDLED;
1920 }
1921
1922 static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
1923 {
1924         struct dwc3                     *dwc = _dwc;
1925         int                             i;
1926         irqreturn_t                     ret = IRQ_NONE;
1927
1928         spin_lock(&dwc->lock);
1929
1930         for (i = 0; i < DWC3_EVENT_BUFFERS_NUM; i++) {
1931                 irqreturn_t status;
1932
1933                 status = dwc3_process_event_buf(dwc, i);
1934                 if (status == IRQ_HANDLED)
1935                         ret = status;
1936         }
1937
1938         spin_unlock(&dwc->lock);
1939
1940         return ret;
1941 }
1942
1943 /**
1944  * dwc3_gadget_init - Initializes gadget related registers
1945  * @dwc: Pointer to out controller context structure
1946  *
1947  * Returns 0 on success otherwise negative errno.
1948  */
1949 int __devinit dwc3_gadget_init(struct dwc3 *dwc)
1950 {
1951         u32                                     reg;
1952         int                                     ret;
1953         int                                     irq;
1954
1955         dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
1956                         &dwc->ctrl_req_addr, GFP_KERNEL);
1957         if (!dwc->ctrl_req) {
1958                 dev_err(dwc->dev, "failed to allocate ctrl request\n");
1959                 ret = -ENOMEM;
1960                 goto err0;
1961         }
1962
1963         dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
1964                         &dwc->ep0_trb_addr, GFP_KERNEL);
1965         if (!dwc->ep0_trb) {
1966                 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
1967                 ret = -ENOMEM;
1968                 goto err1;
1969         }
1970
1971         dwc->setup_buf = dma_alloc_coherent(dwc->dev,
1972                         sizeof(*dwc->setup_buf) * 2,
1973                         &dwc->setup_buf_addr, GFP_KERNEL);
1974         if (!dwc->setup_buf) {
1975                 dev_err(dwc->dev, "failed to allocate setup buffer\n");
1976                 ret = -ENOMEM;
1977                 goto err2;
1978         }
1979
1980         dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
1981                         512, &dwc->ep0_bounce_addr, GFP_KERNEL);
1982         if (!dwc->ep0_bounce) {
1983                 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
1984                 ret = -ENOMEM;
1985                 goto err3;
1986         }
1987
1988         dev_set_name(&dwc->gadget.dev, "gadget");
1989
1990         dwc->gadget.ops                 = &dwc3_gadget_ops;
1991         dwc->gadget.is_dualspeed        = true;
1992         dwc->gadget.speed               = USB_SPEED_UNKNOWN;
1993         dwc->gadget.dev.parent          = dwc->dev;
1994
1995         dma_set_coherent_mask(&dwc->gadget.dev, dwc->dev->coherent_dma_mask);
1996
1997         dwc->gadget.dev.dma_parms       = dwc->dev->dma_parms;
1998         dwc->gadget.dev.dma_mask        = dwc->dev->dma_mask;
1999         dwc->gadget.dev.release         = dwc3_gadget_release;
2000         dwc->gadget.name                = "dwc3-gadget";
2001
2002         /*
2003          * REVISIT: Here we should clear all pending IRQs to be
2004          * sure we're starting from a well known location.
2005          */
2006
2007         ret = dwc3_gadget_init_endpoints(dwc);
2008         if (ret)
2009                 goto err4;
2010
2011         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
2012
2013         ret = request_irq(irq, dwc3_interrupt, IRQF_SHARED,
2014                         "dwc3", dwc);
2015         if (ret) {
2016                 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
2017                                 irq, ret);
2018                 goto err5;
2019         }
2020
2021         /* Enable all but Start and End of Frame IRQs */
2022         reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
2023                         DWC3_DEVTEN_EVNTOVERFLOWEN |
2024                         DWC3_DEVTEN_CMDCMPLTEN |
2025                         DWC3_DEVTEN_ERRTICERREN |
2026                         DWC3_DEVTEN_WKUPEVTEN |
2027                         DWC3_DEVTEN_ULSTCNGEN |
2028                         DWC3_DEVTEN_CONNECTDONEEN |
2029                         DWC3_DEVTEN_USBRSTEN |
2030                         DWC3_DEVTEN_DISCONNEVTEN);
2031         dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
2032
2033         ret = device_register(&dwc->gadget.dev);
2034         if (ret) {
2035                 dev_err(dwc->dev, "failed to register gadget device\n");
2036                 put_device(&dwc->gadget.dev);
2037                 goto err6;
2038         }
2039
2040         ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
2041         if (ret) {
2042                 dev_err(dwc->dev, "failed to register udc\n");
2043                 goto err7;
2044         }
2045
2046         return 0;
2047
2048 err7:
2049         device_unregister(&dwc->gadget.dev);
2050
2051 err6:
2052         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
2053         free_irq(irq, dwc);
2054
2055 err5:
2056         dwc3_gadget_free_endpoints(dwc);
2057
2058 err4:
2059         dma_free_coherent(dwc->dev, 512, dwc->ep0_bounce,
2060                         dwc->ep0_bounce_addr);
2061
2062 err3:
2063         dma_free_coherent(dwc->dev, sizeof(*dwc->setup_buf) * 2,
2064                         dwc->setup_buf, dwc->setup_buf_addr);
2065
2066 err2:
2067         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2068                         dwc->ep0_trb, dwc->ep0_trb_addr);
2069
2070 err1:
2071         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2072                         dwc->ctrl_req, dwc->ctrl_req_addr);
2073
2074 err0:
2075         return ret;
2076 }
2077
2078 void dwc3_gadget_exit(struct dwc3 *dwc)
2079 {
2080         int                     irq;
2081         int                     i;
2082
2083         usb_del_gadget_udc(&dwc->gadget);
2084         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
2085
2086         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
2087         free_irq(irq, dwc);
2088
2089         for (i = 0; i < ARRAY_SIZE(dwc->eps); i++)
2090                 __dwc3_gadget_ep_disable(dwc->eps[i]);
2091
2092         dwc3_gadget_free_endpoints(dwc);
2093
2094         dma_free_coherent(dwc->dev, 512, dwc->ep0_bounce,
2095                         dwc->ep0_bounce_addr);
2096
2097         dma_free_coherent(dwc->dev, sizeof(*dwc->setup_buf) * 2,
2098                         dwc->setup_buf, dwc->setup_buf_addr);
2099
2100         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2101                         dwc->ep0_trb, dwc->ep0_trb_addr);
2102
2103         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2104                         dwc->ctrl_req, dwc->ctrl_req_addr);
2105
2106         device_unregister(&dwc->gadget.dev);
2107 }