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 <[email protected]>,
   7  *          Sebastian Andrzej Siewior <[email protected]>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2  of
  11  * the License as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/delay.h>
  21 #include <linux/slab.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27 #include <linux/list.h>
  28 #include <linux/dma-mapping.h>
  29
  30 #include <linux/usb/ch9.h>
  31 #include <linux/usb/gadget.h>
  32
  33 #include "debug.h"
  34 #include "core.h"
  35 #include "gadget.h"
  36 #include "io.h"
  37
  38 /**
  39  * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
  40  * @dwc: pointer to our context structure
  41  * @mode: the mode to set (J, K SE0 NAK, Force Enable)
  42  *
  43  * Caller should take care of locking. This function will
  44  * return 0 on success or -EINVAL if wrong Test Selector
  45  * is passed
  46  */
  47 int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
  48 {
  49         u32             reg;
  50
  51         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
  52         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
  53
  54         switch (mode) {
  55         case TEST_J:
  56         case TEST_K:
  57         case TEST_SE0_NAK:
  58         case TEST_PACKET:
  59         case TEST_FORCE_EN:
  60                 reg |= mode << 1;
  61                 break;
  62         default:
  63                 return -EINVAL;
  64         }
  65
  66         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
  67
  68         return 0;
  69 }
  70
  71 /**
  72  * dwc3_gadget_get_link_state - Gets current state of USB Link
  73  * @dwc: pointer to our context structure
  74  *
  75  * Caller should take care of locking. This function will
  76  * return the link state on success (>= 0) or -ETIMEDOUT.
  77  */
  78 int dwc3_gadget_get_link_state(struct dwc3 *dwc)
  79 {
  80         u32             reg;
  81
  82         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
  83
  84         return DWC3_DSTS_USBLNKST(reg);
  85 }
  86
  87 /**
  88  * dwc3_gadget_set_link_state - Sets USB Link to a particular State
  89  * @dwc: pointer to our context structure
  90  * @state: the state to put link into
  91  *
  92  * Caller should take care of locking. This function will
  93  * return 0 on success or -ETIMEDOUT.
  94  */
  95 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
  96 {
  97         int             retries = 10000;
  98         u32             reg;
  99
 100         /*
 101          * Wait until device controller is ready. Only applies to 1.94a and
 102          * later RTL.
 103          */
 104         if (dwc->revision >= DWC3_REVISION_194A) {
 105                 while (--retries) {
 106                         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 107                         if (reg & DWC3_DSTS_DCNRD)
 108                                 udelay(5);
 109                         else
 110                                 break;
 111                 }
 112
 113                 if (retries <= 0)
 114                         return -ETIMEDOUT;
 115         }
 116
 117         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 118         reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
 119
 120         /* set requested state */
 121         reg |= DWC3_DCTL_ULSTCHNGREQ(state);
 122         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 123
 124         /*
 125          * The following code is racy when called from dwc3_gadget_wakeup,
 126          * and is not needed, at least on newer versions
 127          */
 128         if (dwc->revision >= DWC3_REVISION_194A)
 129                 return 0;
 130
 131         /* wait for a change in DSTS */
 132         retries = 10000;
 133         while (--retries) {
 134                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 135
 136                 if (DWC3_DSTS_USBLNKST(reg) == state)
 137                         return 0;
 138
 139                 udelay(5);
 140         }
 141
 142         return -ETIMEDOUT;
 143 }
 144
 145 /**
 146  * dwc3_ep_inc_trb() - Increment a TRB index.
 147  * @index - Pointer to the TRB index to increment.
 148  *
 149  * The index should never point to the link TRB. After incrementing,
 150  * if it is point to the link TRB, wrap around to the beginning. The
 151  * link TRB is always at the last TRB entry.
 152  */
 153 static void dwc3_ep_inc_trb(u8 *index)
 154 {
 155         (*index)++;
 156         if (*index == (DWC3_TRB_NUM - 1))
 157                 *index = 0;
 158 }
 159
 160 static void dwc3_ep_inc_enq(struct dwc3_ep *dep)
 161 {
 162         dwc3_ep_inc_trb(&dep->trb_enqueue);
 163 }
 164
 165 static void dwc3_ep_inc_deq(struct dwc3_ep *dep)
 166 {
 167         dwc3_ep_inc_trb(&dep->trb_dequeue);
 168 }
 169
 170 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 171                 int status)
 172 {
 173         struct dwc3                     *dwc = dep->dwc;
 174
 175         req->started = false;
 176         list_del(&req->list);
 177         req->trb = NULL;
 178         req->remaining = 0;
 179
 180         if (req->request.status == -EINPROGRESS)
 181                 req->request.status = status;
 182
 183         if (dwc->ep0_bounced && dep->number == 0)
 184                 dwc->ep0_bounced = false;
 185         else
 186                 usb_gadget_unmap_request_by_dev(dwc->sysdev,
 187                                 &req->request, req->direction);
 188
 189         trace_dwc3_gadget_giveback(req);
 190
 191         spin_unlock(&dwc->lock);
 192         usb_gadget_giveback_request(&dep->endpoint, &req->request);
 193         spin_lock(&dwc->lock);
 194
 195         if (dep->number > 1)
 196                 pm_runtime_put(dwc->dev);
 197 }
 198
 199 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
 200 {
 201         u32             timeout = 500;
 202         int             status = 0;
 203         int             ret = 0;
 204         u32             reg;
 205
 206         dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
 207         dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
 208
 209         do {
 210                 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
 211                 if (!(reg & DWC3_DGCMD_CMDACT)) {
 212                         status = DWC3_DGCMD_STATUS(reg);
 213                         if (status)
 214                                 ret = -EINVAL;
 215                         break;
 216                 }
 217         } while (--timeout);
 218
 219         if (!timeout) {
 220                 ret = -ETIMEDOUT;
 221                 status = -ETIMEDOUT;
 222         }
 223
 224         trace_dwc3_gadget_generic_cmd(cmd, param, status);
 225
 226         return ret;
 227 }
 228
 229 static int __dwc3_gadget_wakeup(struct dwc3 *dwc);
 230
 231 int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
 232                 struct dwc3_gadget_ep_cmd_params *params)
 233 {
 234         const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
 235         struct dwc3             *dwc = dep->dwc;
 236         u32                     timeout = 500;
 237         u32                     reg;
 238
 239         int                     cmd_status = 0;
 240         int                     susphy = false;
 241         int                     ret = -EINVAL;
 242
 243         /*
 244          * Synopsys Databook 2.60a states, on section 6.3.2.5.[1-8], that if
 245          * we're issuing an endpoint command, we must check if
 246          * GUSB2PHYCFG.SUSPHY bit is set. If it is, then we need to clear it.
 247          *
 248          * We will also set SUSPHY bit to what it was before returning as stated
 249          * by the same section on Synopsys databook.
 250          */
 251         if (dwc->gadget.speed <= USB_SPEED_HIGH) {
 252                 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
 253                 if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {
 254                         susphy = true;
 255                         reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
 256                         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 257                 }
 258         }
 259
 260         if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
 261                 int             needs_wakeup;
 262
 263                 needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 ||
 264                                 dwc->link_state == DWC3_LINK_STATE_U2 ||
 265                                 dwc->link_state == DWC3_LINK_STATE_U3);
 266
 267                 if (unlikely(needs_wakeup)) {
 268                         ret = __dwc3_gadget_wakeup(dwc);
 269                         dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n",
 270                                         ret);
 271                 }
 272         }
 273
 274         dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
 275         dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
 276         dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
 277
 278         /*
 279          * Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're
 280          * not relying on XferNotReady, we can make use of a special "No
 281          * Response Update Transfer" command where we should clear both CmdAct
 282          * and CmdIOC bits.
 283          *
 284          * With this, we don't need to wait for command completion and can
 285          * straight away issue further commands to the endpoint.
 286          *
 287          * NOTICE: We're making an assumption that control endpoints will never
 288          * make use of Update Transfer command. This is a safe assumption
 289          * because we can never have more than one request at a time with
 290          * Control Endpoints. If anybody changes that assumption, this chunk
 291          * needs to be updated accordingly.
 292          */
 293         if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_UPDATETRANSFER &&
 294                         !usb_endpoint_xfer_isoc(desc))
 295                 cmd &= ~(DWC3_DEPCMD_CMDIOC | DWC3_DEPCMD_CMDACT);
 296         else
 297                 cmd |= DWC3_DEPCMD_CMDACT;
 298
 299         dwc3_writel(dep->regs, DWC3_DEPCMD, cmd);
 300         do {
 301                 reg = dwc3_readl(dep->regs, DWC3_DEPCMD);
 302                 if (!(reg & DWC3_DEPCMD_CMDACT)) {
 303                         cmd_status = DWC3_DEPCMD_STATUS(reg);
 304
 305                         switch (cmd_status) {
 306                         case 0:
 307                                 ret = 0;
 308                                 break;
 309                         case DEPEVT_TRANSFER_NO_RESOURCE:
 310                                 ret = -EINVAL;
 311                                 break;
 312                         case DEPEVT_TRANSFER_BUS_EXPIRY:
 313                                 /*
 314                                  * SW issues START TRANSFER command to
 315                                  * isochronous ep with future frame interval. If
 316                                  * future interval time has already passed when
 317                                  * core receives the command, it will respond
 318                                  * with an error status of 'Bus Expiry'.
 319                                  *
 320                                  * Instead of always returning -EINVAL, let's
 321                                  * give a hint to the gadget driver that this is
 322                                  * the case by returning -EAGAIN.
 323                                  */
 324                                 ret = -EAGAIN;
 325                                 break;
 326                         default:
 327                                 dev_WARN(dwc->dev, "UNKNOWN cmd status\n");
 328                         }
 329
 330                         break;
 331                 }
 332         } while (--timeout);
 333
 334         if (timeout == 0) {
 335                 ret = -ETIMEDOUT;
 336                 cmd_status = -ETIMEDOUT;
 337         }
 338
 339         trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status);
 340
 341         if (ret == 0) {
 342                 switch (DWC3_DEPCMD_CMD(cmd)) {
 343                 case DWC3_DEPCMD_STARTTRANSFER:
 344                         dep->flags |= DWC3_EP_TRANSFER_STARTED;
 345                         break;
 346                 case DWC3_DEPCMD_ENDTRANSFER:
 347                         dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
 348                         break;
 349                 default:
 350                         /* nothing */
 351                         break;
 352                 }
 353         }
 354
 355         if (unlikely(susphy)) {
 356                 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
 357                 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
 358                 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 359         }
 360
 361         return ret;
 362 }
 363
 364 static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
 365 {
 366         struct dwc3 *dwc = dep->dwc;
 367         struct dwc3_gadget_ep_cmd_params params;
 368         u32 cmd = DWC3_DEPCMD_CLEARSTALL;
 369
 370         /*
 371          * As of core revision 2.60a the recommended programming model
 372          * is to set the ClearPendIN bit when issuing a Clear Stall EP
 373          * command for IN endpoints. This is to prevent an issue where
 374          * some (non-compliant) hosts may not send ACK TPs for pending
 375          * IN transfers due to a mishandled error condition. Synopsys
 376          * STAR 9000614252.
 377          */
 378         if (dep->direction && (dwc->revision >= DWC3_REVISION_260A) &&
 379             (dwc->gadget.speed >= USB_SPEED_SUPER))
 380                 cmd |= DWC3_DEPCMD_CLEARPENDIN;
 381
 382         memset(&params, 0, sizeof(params));
 383
 384         return dwc3_send_gadget_ep_cmd(dep, cmd, &params);
 385 }
 386
 387 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
 388                 struct dwc3_trb *trb)
 389 {
 390         u32             offset = (char *) trb - (char *) dep->trb_pool;
 391
 392         return dep->trb_pool_dma + offset;
 393 }
 394
 395 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
 396 {
 397         struct dwc3             *dwc = dep->dwc;
 398
 399         if (dep->trb_pool)
 400                 return 0;
 401
 402         dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
 403                         sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 404                         &dep->trb_pool_dma, GFP_KERNEL);
 405         if (!dep->trb_pool) {
 406                 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
 407                                 dep->name);
 408                 return -ENOMEM;
 409         }
 410
 411         return 0;
 412 }
 413
 414 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
 415 {
 416         struct dwc3             *dwc = dep->dwc;
 417
 418         dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 419                         dep->trb_pool, dep->trb_pool_dma);
 420
 421         dep->trb_pool = NULL;
 422         dep->trb_pool_dma = 0;
 423 }
 424
 425 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep);
 426
 427 /**
 428  * dwc3_gadget_start_config - Configure EP resources
 429  * @dwc: pointer to our controller context structure
 430  * @dep: endpoint that is being enabled
 431  *
 432  * The assignment of transfer resources cannot perfectly follow the
 433  * data book due to the fact that the controller driver does not have
 434  * all knowledge of the configuration in advance. It is given this
 435  * information piecemeal by the composite gadget framework after every
 436  * SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
 437  * programming model in this scenario can cause errors. For two
 438  * reasons:
 439  *
 440  * 1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION
 441  * and SET_INTERFACE (8.1.5). This is incorrect in the scenario of
 442  * multiple interfaces.
 443  *
 444  * 2) The databook does not mention doing more DEPXFERCFG for new
 445  * endpoint on alt setting (8.1.6).
 446  *
 447  * The following simplified method is used instead:
 448  *
 449  * All hardware endpoints can be assigned a transfer resource and this
 450  * setting will stay persistent until either a core reset or
 451  * hibernation. So whenever we do a DEPSTARTCFG(0) we can go ahead and
 452  * do DEPXFERCFG for every hardware endpoint as well. We are
 453  * guaranteed that there are as many transfer resources as endpoints.
 454  *
 455  * This function is called for each endpoint when it is being enabled
 456  * but is triggered only when called for EP0-out, which always happens
 457  * first, and which should only happen in one of the above conditions.
 458  */
 459 static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
 460 {
 461         struct dwc3_gadget_ep_cmd_params params;
 462         u32                     cmd;
 463         int                     i;
 464         int                     ret;
 465
 466         if (dep->number)
 467                 return 0;
 468
 469         memset(&params, 0x00, sizeof(params));
 470         cmd = DWC3_DEPCMD_DEPSTARTCFG;
 471
 472         ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
 473         if (ret)
 474                 return ret;
 475
 476         for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
 477                 struct dwc3_ep *dep = dwc->eps[i];
 478
 479                 if (!dep)
 480                         continue;
 481
 482                 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
 483                 if (ret)
 484                         return ret;
 485         }
 486
 487         return 0;
 488 }
 489
 490 static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
 491                 bool modify, bool restore)
 492 {
 493         const struct usb_ss_ep_comp_descriptor *comp_desc;
 494         const struct usb_endpoint_descriptor *desc;
 495         struct dwc3_gadget_ep_cmd_params params;
 496
 497         if (dev_WARN_ONCE(dwc->dev, modify && restore,
 498                                         "Can't modify and restore\n"))
 499                 return -EINVAL;
 500
 501         comp_desc = dep->endpoint.comp_desc;
 502         desc = dep->endpoint.desc;
 503
 504         memset(&params, 0x00, sizeof(params));
 505
 506         params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
 507                 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
 508
 509         /* Burst size is only needed in SuperSpeed mode */
 510         if (dwc->gadget.speed >= USB_SPEED_SUPER) {
 511                 u32 burst = dep->endpoint.maxburst;
 512                 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1);
 513         }
 514
 515         if (modify) {
 516                 params.param0 |= DWC3_DEPCFG_ACTION_MODIFY;
 517         } else if (restore) {
 518                 params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
 519                 params.param2 |= dep->saved_state;
 520         } else {
 521                 params.param0 |= DWC3_DEPCFG_ACTION_INIT;
 522         }
 523
 524         if (usb_endpoint_xfer_control(desc))
 525                 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN;
 526
 527         if (dep->number <= 1 || usb_endpoint_xfer_isoc(desc))
 528                 params.param1 |= DWC3_DEPCFG_XFER_NOT_READY_EN;
 529
 530         if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
 531                 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
 532                         | DWC3_DEPCFG_STREAM_EVENT_EN;
 533                 dep->stream_capable = true;
 534         }
 535
 536         if (!usb_endpoint_xfer_control(desc))
 537                 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
 538
 539         /*
 540          * We are doing 1:1 mapping for endpoints, meaning
 541          * Physical Endpoints 2 maps to Logical Endpoint 2 and
 542          * so on. We consider the direction bit as part of the physical
 543          * endpoint number. So USB endpoint 0x81 is 0x03.
 544          */
 545         params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
 546
 547         /*
 548          * We must use the lower 16 TX FIFOs even though
 549          * HW might have more
 550          */
 551         if (dep->direction)
 552                 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
 553
 554         if (desc->bInterval) {
 555                 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
 556                 dep->interval = 1 << (desc->bInterval - 1);
 557         }
 558
 559         return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, &params);
 560 }
 561
 562 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
 563 {
 564         struct dwc3_gadget_ep_cmd_params params;
 565
 566         memset(&params, 0x00, sizeof(params));
 567
 568         params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
 569
 570         return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE,
 571                         &params);
 572 }
 573
 574 /**
 575  * __dwc3_gadget_ep_enable - Initializes a HW endpoint
 576  * @dep: endpoint to be initialized
 577  * @desc: USB Endpoint Descriptor
 578  *
 579  * Caller should take care of locking
 580  */
 581 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
 582                 bool modify, bool restore)
 583 {
 584         const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
 585         struct dwc3             *dwc = dep->dwc;
 586
 587         u32                     reg;
 588         int                     ret;
 589
 590         if (!(dep->flags & DWC3_EP_ENABLED)) {
 591                 ret = dwc3_gadget_start_config(dwc, dep);
 592                 if (ret)
 593                         return ret;
 594         }
 595
 596         ret = dwc3_gadget_set_ep_config(dwc, dep, modify, restore);
 597         if (ret)
 598                 return ret;
 599
 600         if (!(dep->flags & DWC3_EP_ENABLED)) {
 601                 struct dwc3_trb *trb_st_hw;
 602                 struct dwc3_trb *trb_link;
 603
 604                 dep->type = usb_endpoint_type(desc);
 605                 dep->flags |= DWC3_EP_ENABLED;
 606                 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
 607
 608                 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 609                 reg |= DWC3_DALEPENA_EP(dep->number);
 610                 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 611
 612                 init_waitqueue_head(&dep->wait_end_transfer);
 613
 614                 if (usb_endpoint_xfer_control(desc))
 615                         goto out;
 616
 617                 /* Initialize the TRB ring */
 618                 dep->trb_dequeue = 0;
 619                 dep->trb_enqueue = 0;
 620                 memset(dep->trb_pool, 0,
 621                        sizeof(struct dwc3_trb) * DWC3_TRB_NUM);
 622
 623                 /* Link TRB. The HWO bit is never reset */
 624                 trb_st_hw = &dep->trb_pool[0];
 625
 626                 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
 627                 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 628                 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 629                 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
 630                 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
 631         }
 632
 633         /*
 634          * Issue StartTransfer here with no-op TRB so we can always rely on No
 635          * Response Update Transfer command.
 636          */
 637         if (usb_endpoint_xfer_bulk(desc)) {
 638                 struct dwc3_gadget_ep_cmd_params params;
 639                 struct dwc3_trb *trb;
 640                 dma_addr_t trb_dma;
 641                 u32 cmd;
 642
 643                 memset(&params, 0, sizeof(params));
 644                 trb = &dep->trb_pool[0];
 645                 trb_dma = dwc3_trb_dma_offset(dep, trb);
 646
 647                 params.param0 = upper_32_bits(trb_dma);
 648                 params.param1 = lower_32_bits(trb_dma);
 649
 650                 cmd = DWC3_DEPCMD_STARTTRANSFER;
 651
 652                 ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
 653                 if (ret < 0)
 654                         return ret;
 655
 656                 dep->flags |= DWC3_EP_BUSY;
 657
 658                 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
 659                 WARN_ON_ONCE(!dep->resource_index);
 660         }
 661
 662
 663 out:
 664         trace_dwc3_gadget_ep_enable(dep);
 665
 666         return 0;
 667 }
 668
 669 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
 670 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 671 {
 672         struct dwc3_request             *req;
 673
 674         dwc3_stop_active_transfer(dwc, dep->number, true);
 675
 676         /* - giveback all requests to gadget driver */
 677         while (!list_empty(&dep->started_list)) {
 678                 req = next_request(&dep->started_list);
 679
 680                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 681         }
 682
 683         while (!list_empty(&dep->pending_list)) {
 684                 req = next_request(&dep->pending_list);
 685
 686                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 687         }
 688 }
 689
 690 /**
 691  * __dwc3_gadget_ep_disable - Disables a HW endpoint
 692  * @dep: the endpoint to disable
 693  *
 694  * This function also removes requests which are currently processed ny the
 695  * hardware and those which are not yet scheduled.
 696  * Caller should take care of locking.
 697  */
 698 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
 699 {
 700         struct dwc3             *dwc = dep->dwc;
 701         u32                     reg;
 702
 703         trace_dwc3_gadget_ep_disable(dep);
 704
 705         dwc3_remove_requests(dwc, dep);
 706
 707         /* make sure HW endpoint isn't stalled */
 708         if (dep->flags & DWC3_EP_STALL)
 709                 __dwc3_gadget_ep_set_halt(dep, 0, false);
 710
 711         reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 712         reg &= ~DWC3_DALEPENA_EP(dep->number);
 713         dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 714
 715         dep->stream_capable = false;
 716         dep->type = 0;
 717         dep->flags &= DWC3_EP_END_TRANSFER_PENDING;
 718
 719         /* Clear out the ep descriptors for non-ep0 */
 720         if (dep->number > 1) {
 721                 dep->endpoint.comp_desc = NULL;
 722                 dep->endpoint.desc = NULL;
 723         }
 724
 725         return 0;
 726 }
 727
 728 /* -------------------------------------------------------------------------- */
 729
 730 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
 731                 const struct usb_endpoint_descriptor *desc)
 732 {
 733         return -EINVAL;
 734 }
 735
 736 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
 737 {
 738         return -EINVAL;
 739 }
 740
 741 /* -------------------------------------------------------------------------- */
 742
 743 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
 744                 const struct usb_endpoint_descriptor *desc)
 745 {
 746         struct dwc3_ep                  *dep;
 747         struct dwc3                     *dwc;
 748         unsigned long                   flags;
 749         int                             ret;
 750
 751         if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
 752                 pr_debug("dwc3: invalid parameters\n");
 753                 return -EINVAL;
 754         }
 755
 756         if (!desc->wMaxPacketSize) {
 757                 pr_debug("dwc3: missing wMaxPacketSize\n");
 758                 return -EINVAL;
 759         }
 760
 761         dep = to_dwc3_ep(ep);
 762         dwc = dep->dwc;
 763
 764         if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
 765                                         "%s is already enabled\n",
 766                                         dep->name))
 767                 return 0;
 768
 769         spin_lock_irqsave(&dwc->lock, flags);
 770         ret = __dwc3_gadget_ep_enable(dep, false, false);
 771         spin_unlock_irqrestore(&dwc->lock, flags);
 772
 773         return ret;
 774 }
 775
 776 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
 777 {
 778         struct dwc3_ep                  *dep;
 779         struct dwc3                     *dwc;
 780         unsigned long                   flags;
 781         int                             ret;
 782
 783         if (!ep) {
 784                 pr_debug("dwc3: invalid parameters\n");
 785                 return -EINVAL;
 786         }
 787
 788         dep = to_dwc3_ep(ep);
 789         dwc = dep->dwc;
 790
 791         if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
 792                                         "%s is already disabled\n",
 793                                         dep->name))
 794                 return 0;
 795
 796         spin_lock_irqsave(&dwc->lock, flags);
 797         ret = __dwc3_gadget_ep_disable(dep);
 798         spin_unlock_irqrestore(&dwc->lock, flags);
 799
 800         return ret;
 801 }
 802
 803 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
 804         gfp_t gfp_flags)
 805 {
 806         struct dwc3_request             *req;
 807         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 808
 809         req = kzalloc(sizeof(*req), gfp_flags);
 810         if (!req)
 811                 return NULL;
 812
 813         req->epnum      = dep->number;
 814         req->dep        = dep;
 815
 816         dep->allocated_requests++;
 817
 818         trace_dwc3_alloc_request(req);
 819
 820         return &req->request;
 821 }
 822
 823 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
 824                 struct usb_request *request)
 825 {
 826         struct dwc3_request             *req = to_dwc3_request(request);
 827         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 828
 829         dep->allocated_requests--;
 830         trace_dwc3_free_request(req);
 831         kfree(req);
 832 }
 833
 834 static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep);
 835
 836 /**
 837  * dwc3_prepare_one_trb - setup one TRB from one request
 838  * @dep: endpoint for which this request is prepared
 839  * @req: dwc3_request pointer
 840  */
 841 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
 842                 struct dwc3_request *req, dma_addr_t dma,
 843                 unsigned length, unsigned chain, unsigned node)
 844 {
 845         struct dwc3_trb         *trb;
 846         struct dwc3             *dwc = dep->dwc;
 847         struct usb_gadget       *gadget = &dwc->gadget;
 848         enum usb_device_speed   speed = gadget->speed;
 849
 850         trb = &dep->trb_pool[dep->trb_enqueue];
 851
 852         if (!req->trb) {
 853                 dwc3_gadget_move_started_request(req);
 854                 req->trb = trb;
 855                 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
 856                 dep->queued_requests++;
 857         }
 858
 859         dwc3_ep_inc_enq(dep);
 860
 861         trb->size = DWC3_TRB_SIZE_LENGTH(length);
 862         trb->bpl = lower_32_bits(dma);
 863         trb->bph = upper_32_bits(dma);
 864
 865         switch (usb_endpoint_type(dep->endpoint.desc)) {
 866         case USB_ENDPOINT_XFER_CONTROL:
 867                 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
 868                 break;
 869
 870         case USB_ENDPOINT_XFER_ISOC:
 871                 if (!node) {
 872                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
 873
 874                         if (speed == USB_SPEED_HIGH) {
 875                                 struct usb_ep *ep = &dep->endpoint;
 876                                 trb->size |= DWC3_TRB_SIZE_PCM1(ep->mult - 1);
 877                         }
 878                 } else {
 879                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
 880                 }
 881
 882                 /* always enable Interrupt on Missed ISOC */
 883                 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
 884                 break;
 885
 886         case USB_ENDPOINT_XFER_BULK:
 887         case USB_ENDPOINT_XFER_INT:
 888                 trb->ctrl = DWC3_TRBCTL_NORMAL;
 889                 break;
 890         default:
 891                 /*
 892                  * This is only possible with faulty memory because we
 893                  * checked it already :)
 894                  */
 895                 dev_WARN(dwc->dev, "Unknown endpoint type %d\n",
 896                                 usb_endpoint_type(dep->endpoint.desc));
 897         }
 898
 899         /* always enable Continue on Short Packet */
 900         if (usb_endpoint_dir_out(dep->endpoint.desc)) {
 901                 trb->ctrl |= DWC3_TRB_CTRL_CSP;
 902
 903                 if (req->request.short_not_ok)
 904                         trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
 905         }
 906
 907         if ((!req->request.no_interrupt && !chain) ||
 908                         (dwc3_calc_trbs_left(dep) == 0))
 909                 trb->ctrl |= DWC3_TRB_CTRL_IOC;
 910
 911         if (chain)
 912                 trb->ctrl |= DWC3_TRB_CTRL_CHN;
 913
 914         if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
 915                 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
 916
 917         trb->ctrl |= DWC3_TRB_CTRL_HWO;
 918
 919         trace_dwc3_prepare_trb(dep, trb);
 920 }
 921
 922 /**
 923  * dwc3_ep_prev_trb() - Returns the previous TRB in the ring
 924  * @dep: The endpoint with the TRB ring
 925  * @index: The index of the current TRB in the ring
 926  *
 927  * Returns the TRB prior to the one pointed to by the index. If the
 928  * index is 0, we will wrap backwards, skip the link TRB, and return
 929  * the one just before that.
 930  */
 931 static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
 932 {
 933         u8 tmp = index;
 934
 935         if (!tmp)
 936                 tmp = DWC3_TRB_NUM - 1;
 937
 938         return &dep->trb_pool[tmp - 1];
 939 }
 940
 941 static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
 942 {
 943         struct dwc3_trb         *tmp;
 944         struct dwc3             *dwc = dep->dwc;
 945         u8                      trbs_left;
 946
 947         /*
 948          * If enqueue & dequeue are equal than it is either full or empty.
 949          *
 950          * One way to know for sure is if the TRB right before us has HWO bit
 951          * set or not. If it has, then we're definitely full and can't fit any
 952          * more transfers in our ring.
 953          */
 954         if (dep->trb_enqueue == dep->trb_dequeue) {
 955                 tmp = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
 956                 if (dev_WARN_ONCE(dwc->dev, tmp->ctrl & DWC3_TRB_CTRL_HWO,
 957                                   "%s No TRBS left\n", dep->name))
 958                         return 0;
 959
 960                 return DWC3_TRB_NUM - 1;
 961         }
 962
 963         trbs_left = dep->trb_dequeue - dep->trb_enqueue;
 964         trbs_left &= (DWC3_TRB_NUM - 1);
 965
 966         if (dep->trb_dequeue < dep->trb_enqueue)
 967                 trbs_left--;
 968
 969         return trbs_left;
 970 }
 971
 972 static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
 973                 struct dwc3_request *req)
 974 {
 975         struct scatterlist *sg = req->sg;
 976         struct scatterlist *s;
 977         unsigned int    length;
 978         dma_addr_t      dma;
 979         int             i;
 980
 981         for_each_sg(sg, s, req->num_pending_sgs, i) {
 982                 unsigned chain = true;
 983
 984                 length = sg_dma_len(s);
 985                 dma = sg_dma_address(s);
 986
 987                 if (sg_is_last(s))
 988                         chain = false;
 989
 990                 dwc3_prepare_one_trb(dep, req, dma, length,
 991                                 chain, i);
 992
 993                 if (!dwc3_calc_trbs_left(dep))
 994                         break;
 995         }
 996 }
 997
 998 static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
 999                 struct dwc3_request *req)
1000 {
1001         unsigned int    length;
1002         dma_addr_t      dma;
1003
1004         dma = req->request.dma;
1005         length = req->request.length;
1006
1007         dwc3_prepare_one_trb(dep, req, dma, length,
1008                         false, 0);
1009 }
1010
1011 /*
1012  * dwc3_prepare_trbs - setup TRBs from requests
1013  * @dep: endpoint for which requests are being prepared
1014  *
1015  * The function goes through the requests list and sets up TRBs for the
1016  * transfers. The function returns once there are no more TRBs available or
1017  * it runs out of requests.
1018  */
1019 static void dwc3_prepare_trbs(struct dwc3_ep *dep)
1020 {
1021         struct dwc3_request     *req, *n;
1022
1023         BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
1024
1025         if (!dwc3_calc_trbs_left(dep))
1026                 return;
1027
1028         /*
1029          * We can get in a situation where there's a request in the started list
1030          * but there weren't enough TRBs to fully kick it in the first time
1031          * around, so it has been waiting for more TRBs to be freed up.
1032          *
1033          * In that case, we should check if we have a request with pending_sgs
1034          * in the started list and prepare TRBs for that request first,
1035          * otherwise we will prepare TRBs completely out of order and that will
1036          * break things.
1037          */
1038         list_for_each_entry(req, &dep->started_list, list) {
1039                 if (req->num_pending_sgs > 0)
1040                         dwc3_prepare_one_trb_sg(dep, req);
1041
1042                 if (!dwc3_calc_trbs_left(dep))
1043                         return;
1044         }
1045
1046         list_for_each_entry_safe(req, n, &dep->pending_list, list) {
1047                 if (req->num_pending_sgs > 0)
1048                         dwc3_prepare_one_trb_sg(dep, req);
1049                 else
1050                         dwc3_prepare_one_trb_linear(dep, req);
1051
1052                 if (!dwc3_calc_trbs_left(dep))
1053                         return;
1054         }
1055 }
1056
1057 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param)
1058 {
1059         struct dwc3_gadget_ep_cmd_params params;
1060         struct dwc3_request             *req;
1061         int                             starting;
1062         int                             ret;
1063         u32                             cmd;
1064
1065         starting = !(dep->flags & DWC3_EP_BUSY);
1066
1067         dwc3_prepare_trbs(dep);
1068         req = next_request(&dep->started_list);
1069         if (!req) {
1070                 dep->flags |= DWC3_EP_PENDING_REQUEST;
1071                 return 0;
1072         }
1073
1074         memset(&params, 0, sizeof(params));
1075
1076         if (starting) {
1077                 params.param0 = upper_32_bits(req->trb_dma);
1078                 params.param1 = lower_32_bits(req->trb_dma);
1079                 cmd = DWC3_DEPCMD_STARTTRANSFER |
1080                         DWC3_DEPCMD_PARAM(cmd_param);
1081         } else {
1082                 cmd = DWC3_DEPCMD_UPDATETRANSFER |
1083                         DWC3_DEPCMD_PARAM(dep->resource_index);
1084         }
1085
1086         ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
1087         if (ret < 0) {
1088                 /*
1089                  * FIXME we need to iterate over the list of requests
1090                  * here and stop, unmap, free and del each of the linked
1091                  * requests instead of what we do now.
1092                  */
1093                 if (req->trb)
1094                         memset(req->trb, 0, sizeof(struct dwc3_trb));
1095                 dep->queued_requests--;
1096                 dwc3_gadget_giveback(dep, req, ret);
1097                 return ret;
1098         }
1099
1100         dep->flags |= DWC3_EP_BUSY;
1101
1102         if (starting) {
1103                 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
1104                 WARN_ON_ONCE(!dep->resource_index);
1105         }
1106
1107         return 0;
1108 }
1109
1110 static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
1111 {
1112         u32                     reg;
1113
1114         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1115         return DWC3_DSTS_SOFFN(reg);
1116 }
1117
1118 static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
1119                 struct dwc3_ep *dep, u32 cur_uf)
1120 {
1121         u32 uf;
1122
1123         if (list_empty(&dep->pending_list)) {
1124                 dev_info(dwc->dev, "%s: ran out of requests\n",
1125                                 dep->name);
1126                 dep->flags |= DWC3_EP_PENDING_REQUEST;
1127                 return;
1128         }
1129
1130         /* 4 micro frames in the future */
1131         uf = cur_uf + dep->interval * 4;
1132
1133         __dwc3_gadget_kick_transfer(dep, uf);
1134 }
1135
1136 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1137                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1138 {
1139         u32 cur_uf, mask;
1140
1141         mask = ~(dep->interval - 1);
1142         cur_uf = event->parameters & mask;
1143
1144         __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1145 }
1146
1147 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1148 {
1149         struct dwc3             *dwc = dep->dwc;
1150         int                     ret;
1151
1152         if (!dep->endpoint.desc) {
1153                 dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
1154                                 dep->name);
1155                 return -ESHUTDOWN;
1156         }
1157
1158         if (WARN(req->dep != dep, "request %p belongs to '%s'\n",
1159                                 &req->request, req->dep->name)) {
1160                 dev_err(dwc->dev, "%s: request %p belongs to '%s'\n",
1161                                 dep->name, &req->request, req->dep->name);
1162                 return -EINVAL;
1163         }
1164
1165         pm_runtime_get(dwc->dev);
1166
1167         req->request.actual     = 0;
1168         req->request.status     = -EINPROGRESS;
1169         req->direction          = dep->direction;
1170         req->epnum              = dep->number;
1171
1172         trace_dwc3_ep_queue(req);
1173
1174         ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
1175                                             dep->direction);
1176         if (ret)
1177                 return ret;
1178
1179         req->sg                 = req->request.sg;
1180         req->num_pending_sgs    = req->request.num_mapped_sgs;
1181
1182         list_add_tail(&req->list, &dep->pending_list);
1183
1184         /*
1185          * NOTICE: Isochronous endpoints should NEVER be prestarted. We must
1186          * wait for a XferNotReady event so we will know what's the current
1187          * (micro-)frame number.
1188          *
1189          * Without this trick, we are very, very likely gonna get Bus Expiry
1190          * errors which will force us issue EndTransfer command.
1191          */
1192         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1193                 if ((dep->flags & DWC3_EP_PENDING_REQUEST)) {
1194                         if (dep->flags & DWC3_EP_TRANSFER_STARTED) {
1195                                 dwc3_stop_active_transfer(dwc, dep->number, true);
1196                                 dep->flags = DWC3_EP_ENABLED;
1197                         } else {
1198                                 u32 cur_uf;
1199
1200                                 cur_uf = __dwc3_gadget_get_frame(dwc);
1201                                 __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1202                                 dep->flags &= ~DWC3_EP_PENDING_REQUEST;
1203                         }
1204                 }
1205                 return 0;
1206         }
1207
1208         if (!dwc3_calc_trbs_left(dep))
1209                 return 0;
1210
1211         ret = __dwc3_gadget_kick_transfer(dep, 0);
1212         if (ret == -EBUSY)
1213                 ret = 0;
1214
1215         return ret;
1216 }
1217
1218 static void __dwc3_gadget_ep_zlp_complete(struct usb_ep *ep,
1219                 struct usb_request *request)
1220 {
1221         dwc3_gadget_ep_free_request(ep, request);
1222 }
1223
1224 static int __dwc3_gadget_ep_queue_zlp(struct dwc3 *dwc, struct dwc3_ep *dep)
1225 {
1226         struct dwc3_request             *req;
1227         struct usb_request              *request;
1228         struct usb_ep                   *ep = &dep->endpoint;
1229
1230         request = dwc3_gadget_ep_alloc_request(ep, GFP_ATOMIC);
1231         if (!request)
1232                 return -ENOMEM;
1233
1234         request->length = 0;
1235         request->buf = dwc->zlp_buf;
1236         request->complete = __dwc3_gadget_ep_zlp_complete;
1237
1238         req = to_dwc3_request(request);
1239
1240         return __dwc3_gadget_ep_queue(dep, req);
1241 }
1242
1243 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1244         gfp_t gfp_flags)
1245 {
1246         struct dwc3_request             *req = to_dwc3_request(request);
1247         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1248         struct dwc3                     *dwc = dep->dwc;
1249
1250         unsigned long                   flags;
1251
1252         int                             ret;
1253
1254         spin_lock_irqsave(&dwc->lock, flags);
1255         ret = __dwc3_gadget_ep_queue(dep, req);
1256
1257         /*
1258          * Okay, here's the thing, if gadget driver has requested for a ZLP by
1259          * setting request->zero, instead of doing magic, we will just queue an
1260          * extra usb_request ourselves so that it gets handled the same way as
1261          * any other request.
1262          */
1263         if (ret == 0 && request->zero && request->length &&
1264             (request->length % ep->maxpacket == 0))
1265                 ret = __dwc3_gadget_ep_queue_zlp(dwc, dep);
1266
1267         spin_unlock_irqrestore(&dwc->lock, flags);
1268
1269         return ret;
1270 }
1271
1272 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1273                 struct usb_request *request)
1274 {
1275         struct dwc3_request             *req = to_dwc3_request(request);
1276         struct dwc3_request             *r = NULL;
1277
1278         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1279         struct dwc3                     *dwc = dep->dwc;
1280
1281         unsigned long                   flags;
1282         int                             ret = 0;
1283
1284         trace_dwc3_ep_dequeue(req);
1285
1286         spin_lock_irqsave(&dwc->lock, flags);
1287
1288         list_for_each_entry(r, &dep->pending_list, list) {
1289                 if (r == req)
1290                         break;
1291         }
1292
1293         if (r != req) {
1294                 list_for_each_entry(r, &dep->started_list, list) {
1295                         if (r == req)
1296                                 break;
1297                 }
1298                 if (r == req) {
1299                         /* wait until it is processed */
1300                         dwc3_stop_active_transfer(dwc, dep->number, true);
1301                         goto out1;
1302                 }
1303                 dev_err(dwc->dev, "request %p was not queued to %s\n",
1304                                 request, ep->name);
1305                 ret = -EINVAL;
1306                 goto out0;
1307         }
1308
1309 out1:
1310         /* giveback the request */
1311         dwc3_gadget_giveback(dep, req, -ECONNRESET);
1312
1313 out0:
1314         spin_unlock_irqrestore(&dwc->lock, flags);
1315
1316         return ret;
1317 }
1318
1319 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
1320 {
1321         struct dwc3_gadget_ep_cmd_params        params;
1322         struct dwc3                             *dwc = dep->dwc;
1323         int                                     ret;
1324
1325         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1326                 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1327                 return -EINVAL;
1328         }
1329
1330         memset(&params, 0x00, sizeof(params));
1331
1332         if (value) {
1333                 struct dwc3_trb *trb;
1334
1335                 unsigned transfer_in_flight;
1336                 unsigned started;
1337
1338                 if (dep->number > 1)
1339                         trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
1340                 else
1341                         trb = &dwc->ep0_trb[dep->trb_enqueue];
1342
1343                 transfer_in_flight = trb->ctrl & DWC3_TRB_CTRL_HWO;
1344                 started = !list_empty(&dep->started_list);
1345
1346                 if (!protocol && ((dep->direction && transfer_in_flight) ||
1347                                 (!dep->direction && started))) {
1348                         return -EAGAIN;
1349                 }
1350
1351                 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETSTALL,
1352                                 &params);
1353                 if (ret)
1354                         dev_err(dwc->dev, "failed to set STALL on %s\n",
1355                                         dep->name);
1356                 else
1357                         dep->flags |= DWC3_EP_STALL;
1358         } else {
1359
1360                 ret = dwc3_send_clear_stall_ep_cmd(dep);
1361                 if (ret)
1362                         dev_err(dwc->dev, "failed to clear STALL on %s\n",
1363                                         dep->name);
1364                 else
1365                         dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1366         }
1367
1368         return ret;
1369 }
1370
1371 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1372 {
1373         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1374         struct dwc3                     *dwc = dep->dwc;
1375
1376         unsigned long                   flags;
1377
1378         int                             ret;
1379
1380         spin_lock_irqsave(&dwc->lock, flags);
1381         ret = __dwc3_gadget_ep_set_halt(dep, value, false);
1382         spin_unlock_irqrestore(&dwc->lock, flags);
1383
1384         return ret;
1385 }
1386
1387 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1388 {
1389         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1390         struct dwc3                     *dwc = dep->dwc;
1391         unsigned long                   flags;
1392         int                             ret;
1393
1394         spin_lock_irqsave(&dwc->lock, flags);
1395         dep->flags |= DWC3_EP_WEDGE;
1396
1397         if (dep->number == 0 || dep->number == 1)
1398                 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
1399         else
1400                 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
1401         spin_unlock_irqrestore(&dwc->lock, flags);
1402
1403         return ret;
1404 }
1405
1406 /* -------------------------------------------------------------------------- */
1407
1408 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1409         .bLength        = USB_DT_ENDPOINT_SIZE,
1410         .bDescriptorType = USB_DT_ENDPOINT,
1411         .bmAttributes   = USB_ENDPOINT_XFER_CONTROL,
1412 };
1413
1414 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1415         .enable         = dwc3_gadget_ep0_enable,
1416         .disable        = dwc3_gadget_ep0_disable,
1417         .alloc_request  = dwc3_gadget_ep_alloc_request,
1418         .free_request   = dwc3_gadget_ep_free_request,
1419         .queue          = dwc3_gadget_ep0_queue,
1420         .dequeue        = dwc3_gadget_ep_dequeue,
1421         .set_halt       = dwc3_gadget_ep0_set_halt,
1422         .set_wedge      = dwc3_gadget_ep_set_wedge,
1423 };
1424
1425 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1426         .enable         = dwc3_gadget_ep_enable,
1427         .disable        = dwc3_gadget_ep_disable,
1428         .alloc_request  = dwc3_gadget_ep_alloc_request,
1429         .free_request   = dwc3_gadget_ep_free_request,
1430         .queue          = dwc3_gadget_ep_queue,
1431         .dequeue        = dwc3_gadget_ep_dequeue,
1432         .set_halt       = dwc3_gadget_ep_set_halt,
1433         .set_wedge      = dwc3_gadget_ep_set_wedge,
1434 };
1435
1436 /* -------------------------------------------------------------------------- */
1437
1438 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1439 {
1440         struct dwc3             *dwc = gadget_to_dwc(g);
1441
1442         return __dwc3_gadget_get_frame(dwc);
1443 }
1444
1445 static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
1446 {
1447         int                     retries;
1448
1449         int                     ret;
1450         u32                     reg;
1451
1452         u8                      link_state;
1453         u8                      speed;
1454
1455         /*
1456          * According to the Databook Remote wakeup request should
1457          * be issued only when the device is in early suspend state.
1458          *
1459          * We can check that via USB Link State bits in DSTS register.
1460          */
1461         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1462
1463         speed = reg & DWC3_DSTS_CONNECTSPD;
1464         if ((speed == DWC3_DSTS_SUPERSPEED) ||
1465             (speed == DWC3_DSTS_SUPERSPEED_PLUS))
1466                 return 0;
1467
1468         link_state = DWC3_DSTS_USBLNKST(reg);
1469
1470         switch (link_state) {
1471         case DWC3_LINK_STATE_RX_DET:    /* in HS, means Early Suspend */
1472         case DWC3_LINK_STATE_U3:        /* in HS, means SUSPEND */
1473                 break;
1474         default:
1475                 return -EINVAL;
1476         }
1477
1478         ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1479         if (ret < 0) {
1480                 dev_err(dwc->dev, "failed to put link in Recovery\n");
1481                 return ret;
1482         }
1483
1484         /* Recent versions do this automatically */
1485         if (dwc->revision < DWC3_REVISION_194A) {
1486                 /* write zeroes to Link Change Request */
1487                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1488                 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1489                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1490         }
1491
1492         /* poll until Link State changes to ON */
1493         retries = 20000;
1494
1495         while (retries--) {
1496                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1497
1498                 /* in HS, means ON */
1499                 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1500                         break;
1501         }
1502
1503         if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1504                 dev_err(dwc->dev, "failed to send remote wakeup\n");
1505                 return -EINVAL;
1506         }
1507
1508         return 0;
1509 }
1510
1511 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1512 {
1513         struct dwc3             *dwc = gadget_to_dwc(g);
1514         unsigned long           flags;
1515         int                     ret;
1516
1517         spin_lock_irqsave(&dwc->lock, flags);
1518         ret = __dwc3_gadget_wakeup(dwc);
1519         spin_unlock_irqrestore(&dwc->lock, flags);
1520
1521         return ret;
1522 }
1523
1524 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1525                 int is_selfpowered)
1526 {
1527         struct dwc3             *dwc = gadget_to_dwc(g);
1528         unsigned long           flags;
1529
1530         spin_lock_irqsave(&dwc->lock, flags);
1531         g->is_selfpowered = !!is_selfpowered;
1532         spin_unlock_irqrestore(&dwc->lock, flags);
1533
1534         return 0;
1535 }
1536
1537 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
1538 {
1539         u32                     reg;
1540         u32                     timeout = 500;
1541
1542         if (pm_runtime_suspended(dwc->dev))
1543                 return 0;
1544
1545         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1546         if (is_on) {
1547                 if (dwc->revision <= DWC3_REVISION_187A) {
1548                         reg &= ~DWC3_DCTL_TRGTULST_MASK;
1549                         reg |= DWC3_DCTL_TRGTULST_RX_DET;
1550                 }
1551
1552                 if (dwc->revision >= DWC3_REVISION_194A)
1553                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1554                 reg |= DWC3_DCTL_RUN_STOP;
1555
1556                 if (dwc->has_hibernation)
1557                         reg |= DWC3_DCTL_KEEP_CONNECT;
1558
1559                 dwc->pullups_connected = true;
1560         } else {
1561                 reg &= ~DWC3_DCTL_RUN_STOP;
1562
1563                 if (dwc->has_hibernation && !suspend)
1564                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1565
1566                 dwc->pullups_connected = false;
1567         }
1568
1569         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1570
1571         do {
1572                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1573                 reg &= DWC3_DSTS_DEVCTRLHLT;
1574         } while (--timeout && !(!is_on ^ !reg));
1575
1576         if (!timeout)
1577                 return -ETIMEDOUT;
1578
1579         return 0;
1580 }
1581
1582 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1583 {
1584         struct dwc3             *dwc = gadget_to_dwc(g);
1585         unsigned long           flags;
1586         int                     ret;
1587
1588         is_on = !!is_on;
1589
1590         /*
1591          * Per databook, when we want to stop the gadget, if a control transfer
1592          * is still in process, complete it and get the core into setup phase.
1593          */
1594         if (!is_on && dwc->ep0state != EP0_SETUP_PHASE) {
1595                 reinit_completion(&dwc->ep0_in_setup);
1596
1597                 ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
1598                                 msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
1599                 if (ret == 0) {
1600                         dev_err(dwc->dev, "timed out waiting for SETUP phase\n");
1601                         return -ETIMEDOUT;
1602                 }
1603         }
1604
1605         spin_lock_irqsave(&dwc->lock, flags);
1606         ret = dwc3_gadget_run_stop(dwc, is_on, false);
1607         spin_unlock_irqrestore(&dwc->lock, flags);
1608
1609         return ret;
1610 }
1611
1612 static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1613 {
1614         u32                     reg;
1615
1616         /* Enable all but Start and End of Frame IRQs */
1617         reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1618                         DWC3_DEVTEN_EVNTOVERFLOWEN |
1619                         DWC3_DEVTEN_CMDCMPLTEN |
1620                         DWC3_DEVTEN_ERRTICERREN |
1621                         DWC3_DEVTEN_WKUPEVTEN |
1622                         DWC3_DEVTEN_CONNECTDONEEN |
1623                         DWC3_DEVTEN_USBRSTEN |
1624                         DWC3_DEVTEN_DISCONNEVTEN);
1625
1626         if (dwc->revision < DWC3_REVISION_250A)
1627                 reg |= DWC3_DEVTEN_ULSTCNGEN;
1628
1629         dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1630 }
1631
1632 static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1633 {
1634         /* mask all interrupts */
1635         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1636 }
1637
1638 static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1639 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1640
1641 /**
1642  * dwc3_gadget_setup_nump - Calculate and initialize NUMP field of DCFG
1643  * dwc: pointer to our context structure
1644  *
1645  * The following looks like complex but it's actually very simple. In order to
1646  * calculate the number of packets we can burst at once on OUT transfers, we're
1647  * gonna use RxFIFO size.
1648  *
1649  * To calculate RxFIFO size we need two numbers:
1650  * MDWIDTH = size, in bits, of the internal memory bus
1651  * RAM2_DEPTH = depth, in MDWIDTH, of internal RAM2 (where RxFIFO sits)
1652  *
1653  * Given these two numbers, the formula is simple:
1654  *
1655  * RxFIFO Size = (RAM2_DEPTH * MDWIDTH / 8) - 24 - 16;
1656  *
1657  * 24 bytes is for 3x SETUP packets
1658  * 16 bytes is a clock domain crossing tolerance
1659  *
1660  * Given RxFIFO Size, NUMP = RxFIFOSize / 1024;
1661  */
1662 static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
1663 {
1664         u32 ram2_depth;
1665         u32 mdwidth;
1666         u32 nump;
1667         u32 reg;
1668
1669         ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7);
1670         mdwidth = DWC3_GHWPARAMS0_MDWIDTH(dwc->hwparams.hwparams0);
1671
1672         nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
1673         nump = min_t(u32, nump, 16);
1674
1675         /* update NumP */
1676         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1677         reg &= ~DWC3_DCFG_NUMP_MASK;
1678         reg |= nump << DWC3_DCFG_NUMP_SHIFT;
1679         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1680 }
1681
1682 static int __dwc3_gadget_start(struct dwc3 *dwc)
1683 {
1684         struct dwc3_ep          *dep;
1685         int                     ret = 0;
1686         u32                     reg;
1687
1688         /*
1689          * Use IMOD if enabled via dwc->imod_interval. Otherwise, if
1690          * the core supports IMOD, disable it.
1691          */
1692         if (dwc->imod_interval) {
1693                 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
1694                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
1695         } else if (dwc3_has_imod(dwc)) {
1696                 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), 0);
1697         }
1698
1699         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1700         reg &= ~(DWC3_DCFG_SPEED_MASK);
1701
1702         /**
1703          * WORKAROUND: DWC3 revision < 2.20a have an issue
1704          * which would cause metastability state on Run/Stop
1705          * bit if we try to force the IP to USB2-only mode.
1706          *
1707          * Because of that, we cannot configure the IP to any
1708          * speed other than the SuperSpeed
1709          *
1710          * Refers to:
1711          *
1712          * STAR#9000525659: Clock Domain Crossing on DCTL in
1713          * USB 2.0 Mode
1714          */
1715         if (dwc->revision < DWC3_REVISION_220A) {
1716                 reg |= DWC3_DCFG_SUPERSPEED;
1717         } else {
1718                 switch (dwc->maximum_speed) {
1719                 case USB_SPEED_LOW:
1720                         reg |= DWC3_DCFG_LOWSPEED;
1721                         break;
1722                 case USB_SPEED_FULL:
1723                         reg |= DWC3_DCFG_FULLSPEED1;
1724                         break;
1725                 case USB_SPEED_HIGH:
1726                         reg |= DWC3_DCFG_HIGHSPEED;
1727                         break;
1728                 case USB_SPEED_SUPER_PLUS:
1729                         reg |= DWC3_DCFG_SUPERSPEED_PLUS;
1730                         break;
1731                 default:
1732                         dev_err(dwc->dev, "invalid dwc->maximum_speed (%d)\n",
1733                                 dwc->maximum_speed);
1734                         /* fall through */
1735                 case USB_SPEED_SUPER:
1736                         reg |= DWC3_DCFG_SUPERSPEED;
1737                         break;
1738                 }
1739         }
1740         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1741
1742         /*
1743          * We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP
1744          * field instead of letting dwc3 itself calculate that automatically.
1745          *
1746          * This way, we maximize the chances that we'll be able to get several
1747          * bursts of data without going through any sort of endpoint throttling.
1748          */
1749         reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
1750         reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL;
1751         dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
1752
1753         dwc3_gadget_setup_nump(dwc);
1754
1755         /* Start with SuperSpeed Default */
1756         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1757
1758         dep = dwc->eps[0];
1759         ret = __dwc3_gadget_ep_enable(dep, false, false);
1760         if (ret) {
1761                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1762                 goto err0;
1763         }
1764
1765         dep = dwc->eps[1];
1766         ret = __dwc3_gadget_ep_enable(dep, false, false);
1767         if (ret) {
1768                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1769                 goto err1;
1770         }
1771
1772         /* begin to receive SETUP packets */
1773         dwc->ep0state = EP0_SETUP_PHASE;
1774         dwc3_ep0_out_start(dwc);
1775
1776         dwc3_gadget_enable_irq(dwc);
1777
1778         return 0;
1779
1780 err1:
1781         __dwc3_gadget_ep_disable(dwc->eps[0]);
1782
1783 err0:
1784         return ret;
1785 }
1786
1787 static int dwc3_gadget_start(struct usb_gadget *g,
1788                 struct usb_gadget_driver *driver)
1789 {
1790         struct dwc3             *dwc = gadget_to_dwc(g);
1791         unsigned long           flags;
1792         int                     ret = 0;
1793         int                     irq;
1794
1795         irq = dwc->irq_gadget;
1796         ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
1797                         IRQF_SHARED, "dwc3", dwc->ev_buf);
1798         if (ret) {
1799                 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
1800                                 irq, ret);
1801                 goto err0;
1802         }
1803
1804         spin_lock_irqsave(&dwc->lock, flags);
1805         if (dwc->gadget_driver) {
1806                 dev_err(dwc->dev, "%s is already bound to %s\n",
1807                                 dwc->gadget.name,
1808                                 dwc->gadget_driver->driver.name);
1809                 ret = -EBUSY;
1810                 goto err1;
1811         }
1812
1813         dwc->gadget_driver      = driver;
1814
1815         if (pm_runtime_active(dwc->dev))
1816                 __dwc3_gadget_start(dwc);
1817
1818         spin_unlock_irqrestore(&dwc->lock, flags);
1819
1820         return 0;
1821
1822 err1:
1823         spin_unlock_irqrestore(&dwc->lock, flags);
1824         free_irq(irq, dwc);
1825
1826 err0:
1827         return ret;
1828 }
1829
1830 static void __dwc3_gadget_stop(struct dwc3 *dwc)
1831 {
1832         dwc3_gadget_disable_irq(dwc);
1833         __dwc3_gadget_ep_disable(dwc->eps[0]);
1834         __dwc3_gadget_ep_disable(dwc->eps[1]);
1835 }
1836
1837 static int dwc3_gadget_stop(struct usb_gadget *g)
1838 {
1839         struct dwc3             *dwc = gadget_to_dwc(g);
1840         unsigned long           flags;
1841         int                     epnum;
1842
1843         spin_lock_irqsave(&dwc->lock, flags);
1844
1845         if (pm_runtime_suspended(dwc->dev))
1846                 goto out;
1847
1848         __dwc3_gadget_stop(dwc);
1849
1850         for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1851                 struct dwc3_ep  *dep = dwc->eps[epnum];
1852
1853                 if (!dep)
1854                         continue;
1855
1856                 if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
1857                         continue;
1858
1859                 wait_event_lock_irq(dep->wait_end_transfer,
1860                                     !(dep->flags & DWC3_EP_END_TRANSFER_PENDING),
1861                                     dwc->lock);
1862         }
1863
1864 out:
1865         dwc->gadget_driver      = NULL;
1866         spin_unlock_irqrestore(&dwc->lock, flags);
1867
1868         free_irq(dwc->irq_gadget, dwc->ev_buf);
1869
1870         return 0;
1871 }
1872
1873 static const struct usb_gadget_ops dwc3_gadget_ops = {
1874         .get_frame              = dwc3_gadget_get_frame,
1875         .wakeup                 = dwc3_gadget_wakeup,
1876         .set_selfpowered        = dwc3_gadget_set_selfpowered,
1877         .pullup                 = dwc3_gadget_pullup,
1878         .udc_start              = dwc3_gadget_start,
1879         .udc_stop               = dwc3_gadget_stop,
1880 };
1881
1882 /* -------------------------------------------------------------------------- */
1883
1884 static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1885                 u8 num, u32 direction)
1886 {
1887         struct dwc3_ep                  *dep;
1888         u8                              i;
1889
1890         for (i = 0; i < num; i++) {
1891                 u8 epnum = (i << 1) | (direction ? 1 : 0);
1892
1893                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1894                 if (!dep)
1895                         return -ENOMEM;
1896
1897                 dep->dwc = dwc;
1898                 dep->number = epnum;
1899                 dep->direction = !!direction;
1900                 dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
1901                 dwc->eps[epnum] = dep;
1902
1903                 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1904                                 (epnum & 1) ? "in" : "out");
1905
1906                 dep->endpoint.name = dep->name;
1907
1908                 if (!(dep->number > 1)) {
1909                         dep->endpoint.desc = &dwc3_gadget_ep0_desc;
1910                         dep->endpoint.comp_desc = NULL;
1911                 }
1912
1913                 spin_lock_init(&dep->lock);
1914
1915                 if (epnum == 0 || epnum == 1) {
1916                         usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
1917                         dep->endpoint.maxburst = 1;
1918                         dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1919                         if (!epnum)
1920                                 dwc->gadget.ep0 = &dep->endpoint;
1921                 } else {
1922                         int             ret;
1923
1924                         usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
1925                         dep->endpoint.max_streams = 15;
1926                         dep->endpoint.ops = &dwc3_gadget_ep_ops;
1927                         list_add_tail(&dep->endpoint.ep_list,
1928                                         &dwc->gadget.ep_list);
1929
1930                         ret = dwc3_alloc_trb_pool(dep);
1931                         if (ret)
1932                                 return ret;
1933                 }
1934
1935                 if (epnum == 0 || epnum == 1) {
1936                         dep->endpoint.caps.type_control = true;
1937                 } else {
1938                         dep->endpoint.caps.type_iso = true;
1939                         dep->endpoint.caps.type_bulk = true;
1940                         dep->endpoint.caps.type_int = true;
1941                 }
1942
1943                 dep->endpoint.caps.dir_in = !!direction;
1944                 dep->endpoint.caps.dir_out = !direction;
1945
1946                 INIT_LIST_HEAD(&dep->pending_list);
1947                 INIT_LIST_HEAD(&dep->started_list);
1948         }
1949
1950         return 0;
1951 }
1952
1953 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1954 {
1955         int                             ret;
1956
1957         INIT_LIST_HEAD(&dwc->gadget.ep_list);
1958
1959         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1960         if (ret < 0) {
1961                 dev_err(dwc->dev, "failed to initialize OUT endpoints\n");
1962                 return ret;
1963         }
1964
1965         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1966         if (ret < 0) {
1967                 dev_err(dwc->dev, "failed to initialize IN endpoints\n");
1968                 return ret;
1969         }
1970
1971         return 0;
1972 }
1973
1974 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1975 {
1976         struct dwc3_ep                  *dep;
1977         u8                              epnum;
1978
1979         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1980                 dep = dwc->eps[epnum];
1981                 if (!dep)
1982                         continue;
1983                 /*
1984                  * Physical endpoints 0 and 1 are special; they form the
1985                  * bi-directional USB endpoint 0.
1986                  *
1987                  * For those two physical endpoints, we don't allocate a TRB
1988                  * pool nor do we add them the endpoints list. Due to that, we
1989                  * shouldn't do these two operations otherwise we would end up
1990                  * with all sorts of bugs when removing dwc3.ko.
1991                  */
1992                 if (epnum != 0 && epnum != 1) {
1993                         dwc3_free_trb_pool(dep);
1994                         list_del(&dep->endpoint.ep_list);
1995                 }
1996
1997                 kfree(dep);
1998         }
1999 }
2000
2001 /* -------------------------------------------------------------------------- */
2002
2003 static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
2004                 struct dwc3_request *req, struct dwc3_trb *trb,
2005                 const struct dwc3_event_depevt *event, int status,
2006                 int chain)
2007 {
2008         unsigned int            count;
2009         unsigned int            s_pkt = 0;
2010         unsigned int            trb_status;
2011
2012         dwc3_ep_inc_deq(dep);
2013
2014         if (req->trb == trb)
2015                 dep->queued_requests--;
2016
2017         trace_dwc3_complete_trb(dep, trb);
2018
2019         /*
2020          * If we're in the middle of series of chained TRBs and we
2021          * receive a short transfer along the way, DWC3 will skip
2022          * through all TRBs including the last TRB in the chain (the
2023          * where CHN bit is zero. DWC3 will also avoid clearing HWO
2024          * bit and SW has to do it manually.
2025          *
2026          * We're going to do that here to avoid problems of HW trying
2027          * to use bogus TRBs for transfers.
2028          */
2029         if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO))
2030                 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
2031
2032         if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
2033                 return 1;
2034
2035         count = trb->size & DWC3_TRB_SIZE_MASK;
2036         req->remaining += count;
2037
2038         if (dep->direction) {
2039                 if (count) {
2040                         trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
2041                         if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
2042                                 /*
2043                                  * If missed isoc occurred and there is
2044                                  * no request queued then issue END
2045                                  * TRANSFER, so that core generates
2046                                  * next xfernotready and we will issue
2047                                  * a fresh START TRANSFER.
2048                                  * If there are still queued request
2049                                  * then wait, do not issue either END
2050                                  * or UPDATE TRANSFER, just attach next
2051                                  * request in pending_list during
2052                                  * giveback.If any future queued request
2053                                  * is successfully transferred then we
2054                                  * will issue UPDATE TRANSFER for all
2055                                  * request in the pending_list.
2056                                  */
2057                                 dep->flags |= DWC3_EP_MISSED_ISOC;
2058                         } else {
2059                                 dev_err(dwc->dev, "incomplete IN transfer %s\n",
2060                                                 dep->name);
2061                                 status = -ECONNRESET;
2062                         }
2063                 } else {
2064                         dep->flags &= ~DWC3_EP_MISSED_ISOC;
2065                 }
2066         } else {
2067                 if (count && (event->status & DEPEVT_STATUS_SHORT))
2068                         s_pkt = 1;
2069         }
2070
2071         if (s_pkt && !chain)
2072                 return 1;
2073
2074         if ((event->status & DEPEVT_STATUS_IOC) &&
2075                         (trb->ctrl & DWC3_TRB_CTRL_IOC))
2076                 return 1;
2077
2078         return 0;
2079 }
2080
2081 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
2082                 const struct dwc3_event_depevt *event, int status)
2083 {
2084         struct dwc3_request     *req, *n;
2085         struct dwc3_trb         *trb;
2086         bool                    ioc = false;
2087         int                     ret = 0;
2088
2089         list_for_each_entry_safe(req, n, &dep->started_list, list) {
2090                 unsigned length;
2091                 int chain;
2092
2093                 length = req->request.length;
2094                 chain = req->num_pending_sgs > 0;
2095                 if (chain) {
2096                         struct scatterlist *sg = req->sg;
2097                         struct scatterlist *s;
2098                         unsigned int pending = req->num_pending_sgs;
2099                         unsigned int i;
2100
2101                         for_each_sg(sg, s, pending, i) {
2102                                 trb = &dep->trb_pool[dep->trb_dequeue];
2103
2104                                 if (trb->ctrl & DWC3_TRB_CTRL_HWO)
2105                                         break;
2106
2107                                 req->sg = sg_next(s);
2108                                 req->num_pending_sgs--;
2109
2110                                 ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
2111                                                 event, status, chain);
2112                                 if (ret)
2113                                         break;
2114                         }
2115                 } else {
2116                         trb = &dep->trb_pool[dep->trb_dequeue];
2117                         ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
2118                                         event, status, chain);
2119                 }
2120
2121                 req->request.actual = length - req->remaining;
2122
2123                 if ((req->request.actual < length) && req->num_pending_sgs)
2124                         return __dwc3_gadget_kick_transfer(dep, 0);
2125
2126                 dwc3_gadget_giveback(dep, req, status);
2127
2128                 if (ret) {
2129                         if ((event->status & DEPEVT_STATUS_IOC) &&
2130                             (trb->ctrl & DWC3_TRB_CTRL_IOC))
2131                                 ioc = true;
2132                         break;
2133                 }
2134         }
2135
2136         /*
2137          * Our endpoint might get disabled by another thread during
2138          * dwc3_gadget_giveback(). If that happens, we're just gonna return 1
2139          * early on so DWC3_EP_BUSY flag gets cleared
2140          */
2141         if (!dep->endpoint.desc)
2142                 return 1;
2143
2144         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
2145                         list_empty(&dep->started_list)) {
2146                 if (list_empty(&dep->pending_list)) {
2147                         /*
2148                          * If there is no entry in request list then do
2149                          * not issue END TRANSFER now. Just set PENDING
2150                          * flag, so that END TRANSFER is issued when an
2151                          * entry is added into request list.
2152                          */
2153                         dep->flags = DWC3_EP_PENDING_REQUEST;
2154                 } else {
2155                         dwc3_stop_active_transfer(dwc, dep->number, true);
2156                         dep->flags = DWC3_EP_ENABLED;
2157                 }
2158                 return 1;
2159         }
2160
2161         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) && ioc)
2162                 return 0;
2163
2164         return 1;
2165 }
2166
2167 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
2168                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
2169 {
2170         unsigned                status = 0;
2171         int                     clean_busy;
2172         u32                     is_xfer_complete;
2173
2174         is_xfer_complete = (event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE);
2175
2176         if (event->status & DEPEVT_STATUS_BUSERR)
2177                 status = -ECONNRESET;
2178
2179         clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
2180         if (clean_busy && (!dep->endpoint.desc || is_xfer_complete ||
2181                                 usb_endpoint_xfer_isoc(dep->endpoint.desc)))
2182                 dep->flags &= ~DWC3_EP_BUSY;
2183
2184         /*
2185          * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
2186          * See dwc3_gadget_linksts_change_interrupt() for 1st half.
2187          */
2188         if (dwc->revision < DWC3_REVISION_183A) {
2189                 u32             reg;
2190                 int             i;
2191
2192                 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
2193                         dep = dwc->eps[i];
2194
2195                         if (!(dep->flags & DWC3_EP_ENABLED))
2196                                 continue;
2197
2198                         if (!list_empty(&dep->started_list))
2199                                 return;
2200                 }
2201
2202                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2203                 reg |= dwc->u1u2;
2204                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2205
2206                 dwc->u1u2 = 0;
2207         }
2208
2209         /*
2210          * Our endpoint might get disabled by another thread during
2211          * dwc3_gadget_giveback(). If that happens, we're just gonna return 1
2212          * early on so DWC3_EP_BUSY flag gets cleared
2213          */
2214         if (!dep->endpoint.desc)
2215                 return;
2216
2217         if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2218                 int ret;
2219
2220                 ret = __dwc3_gadget_kick_transfer(dep, 0);
2221                 if (!ret || ret == -EBUSY)
2222                         return;
2223         }
2224 }
2225
2226 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
2227                 const struct dwc3_event_depevt *event)
2228 {
2229         struct dwc3_ep          *dep;
2230         u8                      epnum = event->endpoint_number;
2231         u8                      cmd;
2232
2233         dep = dwc->eps[epnum];
2234
2235         if (!(dep->flags & DWC3_EP_ENABLED) &&
2236             !(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
2237                 return;
2238
2239         if (epnum == 0 || epnum == 1) {
2240                 dwc3_ep0_interrupt(dwc, event);
2241                 return;
2242         }
2243
2244         switch (event->endpoint_event) {
2245         case DWC3_DEPEVT_XFERCOMPLETE:
2246                 dep->resource_index = 0;
2247
2248                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2249                         dev_err(dwc->dev, "XferComplete for Isochronous endpoint\n");
2250                         return;
2251                 }
2252
2253                 dwc3_endpoint_transfer_complete(dwc, dep, event);
2254                 break;
2255         case DWC3_DEPEVT_XFERINPROGRESS:
2256                 dwc3_endpoint_transfer_complete(dwc, dep, event);
2257                 break;
2258         case DWC3_DEPEVT_XFERNOTREADY:
2259                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
2260                         dwc3_gadget_start_isoc(dwc, dep, event);
2261                 } else {
2262                         int ret;
2263
2264                         ret = __dwc3_gadget_kick_transfer(dep, 0);
2265                         if (!ret || ret == -EBUSY)
2266                                 return;
2267                 }
2268
2269                 break;
2270         case DWC3_DEPEVT_STREAMEVT:
2271                 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
2272                         dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
2273                                         dep->name);
2274                         return;
2275                 }
2276                 break;
2277         case DWC3_DEPEVT_EPCMDCMPLT:
2278                 cmd = DEPEVT_PARAMETER_CMD(event->parameters);
2279
2280                 if (cmd == DWC3_DEPCMD_ENDTRANSFER) {
2281                         dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
2282                         wake_up(&dep->wait_end_transfer);
2283                 }
2284                 break;
2285         case DWC3_DEPEVT_RXTXFIFOEVT:
2286                 break;
2287         }
2288 }
2289
2290 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
2291 {
2292         if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
2293                 spin_unlock(&dwc->lock);
2294                 dwc->gadget_driver->disconnect(&dwc->gadget);
2295                 spin_lock(&dwc->lock);
2296         }
2297 }
2298
2299 static void dwc3_suspend_gadget(struct dwc3 *dwc)
2300 {
2301         if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
2302                 spin_unlock(&dwc->lock);
2303                 dwc->gadget_driver->suspend(&dwc->gadget);
2304                 spin_lock(&dwc->lock);
2305         }
2306 }
2307
2308 static void dwc3_resume_gadget(struct dwc3 *dwc)
2309 {
2310         if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2311                 spin_unlock(&dwc->lock);
2312                 dwc->gadget_driver->resume(&dwc->gadget);
2313                 spin_lock(&dwc->lock);
2314         }
2315 }
2316
2317 static void dwc3_reset_gadget(struct dwc3 *dwc)
2318 {
2319         if (!dwc->gadget_driver)
2320                 return;
2321
2322         if (dwc->gadget.speed != USB_SPEED_UNKNOWN) {
2323                 spin_unlock(&dwc->lock);
2324                 usb_gadget_udc_reset(&dwc->gadget, dwc->gadget_driver);
2325                 spin_lock(&dwc->lock);
2326         }
2327 }
2328
2329 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force)
2330 {
2331         struct dwc3_ep *dep;
2332         struct dwc3_gadget_ep_cmd_params params;
2333         u32 cmd;
2334         int ret;
2335
2336         dep = dwc->eps[epnum];
2337
2338         if ((dep->flags & DWC3_EP_END_TRANSFER_PENDING) ||
2339             !dep->resource_index)
2340                 return;
2341
2342         /*
2343          * NOTICE: We are violating what the Databook says about the
2344          * EndTransfer command. Ideally we would _always_ wait for the
2345          * EndTransfer Command Completion IRQ, but that's causing too
2346          * much trouble synchronizing between us and gadget driver.
2347          *
2348          * We have discussed this with the IP Provider and it was
2349          * suggested to giveback all requests here, but give HW some
2350          * extra time to synchronize with the interconnect. We're using
2351          * an arbitrary 100us delay for that.
2352          *
2353          * Note also that a similar handling was tested by Synopsys
2354          * (thanks a lot Paul) and nothing bad has come out of it.
2355          * In short, what we're doing is:
2356          *
2357          * - Issue EndTransfer WITH CMDIOC bit set
2358          * - Wait 100us
2359          *
2360          * As of IP version 3.10a of the DWC_usb3 IP, the controller
2361          * supports a mode to work around the above limitation. The
2362          * software can poll the CMDACT bit in the DEPCMD register
2363          * after issuing a EndTransfer command. This mode is enabled
2364          * by writing GUCTL2[14]. This polling is already done in the
2365          * dwc3_send_gadget_ep_cmd() function so if the mode is
2366          * enabled, the EndTransfer command will have completed upon
2367          * returning from this function and we don't need to delay for
2368          * 100us.
2369          *
2370          * This mode is NOT available on the DWC_usb31 IP.
2371          */
2372
2373         cmd = DWC3_DEPCMD_ENDTRANSFER;
2374         cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
2375         cmd |= DWC3_DEPCMD_CMDIOC;
2376         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
2377         memset(&params, 0, sizeof(params));
2378         ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
2379         WARN_ON_ONCE(ret);
2380         dep->resource_index = 0;
2381         dep->flags &= ~DWC3_EP_BUSY;
2382
2383         if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A) {
2384                 dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
2385                 udelay(100);
2386         }
2387 }
2388
2389 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2390 {
2391         u32 epnum;
2392
2393         for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2394                 struct dwc3_ep *dep;
2395                 int ret;
2396
2397                 dep = dwc->eps[epnum];
2398                 if (!dep)
2399                         continue;
2400
2401                 if (!(dep->flags & DWC3_EP_STALL))
2402                         continue;
2403
2404                 dep->flags &= ~DWC3_EP_STALL;
2405
2406                 ret = dwc3_send_clear_stall_ep_cmd(dep);
2407                 WARN_ON_ONCE(ret);
2408         }
2409 }
2410
2411 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2412 {
2413         int                     reg;
2414
2415         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2416         reg &= ~DWC3_DCTL_INITU1ENA;
2417         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2418
2419         reg &= ~DWC3_DCTL_INITU2ENA;
2420         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2421
2422         dwc3_disconnect_gadget(dwc);
2423
2424         dwc->gadget.speed = USB_SPEED_UNKNOWN;
2425         dwc->setup_packet_pending = false;
2426         usb_gadget_set_state(&dwc->gadget, USB_STATE_NOTATTACHED);
2427
2428         dwc->connected = false;
2429 }
2430
2431 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2432 {
2433         u32                     reg;
2434
2435         dwc->connected = true;
2436
2437         /*
2438          * WORKAROUND: DWC3 revisions <1.88a have an issue which
2439          * would cause a missing Disconnect Event if there's a
2440          * pending Setup Packet in the FIFO.
2441          *
2442          * There's no suggested workaround on the official Bug
2443          * report, which states that "unless the driver/application
2444          * is doing any special handling of a disconnect event,
2445          * there is no functional issue".
2446          *
2447          * Unfortunately, it turns out that we _do_ some special
2448          * handling of a disconnect event, namely complete all
2449          * pending transfers, notify gadget driver of the
2450          * disconnection, and so on.
2451          *
2452          * Our suggested workaround is to follow the Disconnect
2453          * Event steps here, instead, based on a setup_packet_pending
2454          * flag. Such flag gets set whenever we have a SETUP_PENDING
2455          * status for EP0 TRBs and gets cleared on XferComplete for the
2456          * same endpoint.
2457          *
2458          * Refers to:
2459          *
2460          * STAR#9000466709: RTL: Device : Disconnect event not
2461          * generated if setup packet pending in FIFO
2462          */
2463         if (dwc->revision < DWC3_REVISION_188A) {
2464                 if (dwc->setup_packet_pending)
2465                         dwc3_gadget_disconnect_interrupt(dwc);
2466         }
2467
2468         dwc3_reset_gadget(dwc);
2469
2470         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2471         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2472         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2473         dwc->test_mode = false;
2474         dwc3_clear_stall_all_ep(dwc);
2475
2476         /* Reset device address to zero */
2477         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2478         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2479         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2480 }
2481
2482 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2483 {
2484         struct dwc3_ep          *dep;
2485         int                     ret;
2486         u32                     reg;
2487         u8                      speed;
2488
2489         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2490         speed = reg & DWC3_DSTS_CONNECTSPD;
2491         dwc->speed = speed;
2492
2493         /*
2494          * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2495          * each time on Connect Done.
2496          *
2497          * Currently we always use the reset value. If any platform
2498          * wants to set this to a different value, we need to add a
2499          * setting and update GCTL.RAMCLKSEL here.
2500          */
2501
2502         switch (speed) {
2503         case DWC3_DSTS_SUPERSPEED_PLUS:
2504                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2505                 dwc->gadget.ep0->maxpacket = 512;
2506                 dwc->gadget.speed = USB_SPEED_SUPER_PLUS;
2507                 break;
2508         case DWC3_DSTS_SUPERSPEED:
2509                 /*
2510                  * WORKAROUND: DWC3 revisions <1.90a have an issue which
2511                  * would cause a missing USB3 Reset event.
2512                  *
2513                  * In such situations, we should force a USB3 Reset
2514                  * event by calling our dwc3_gadget_reset_interrupt()
2515                  * routine.
2516                  *
2517                  * Refers to:
2518                  *
2519                  * STAR#9000483510: RTL: SS : USB3 reset event may
2520                  * not be generated always when the link enters poll
2521                  */
2522                 if (dwc->revision < DWC3_REVISION_190A)
2523                         dwc3_gadget_reset_interrupt(dwc);
2524
2525                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2526                 dwc->gadget.ep0->maxpacket = 512;
2527                 dwc->gadget.speed = USB_SPEED_SUPER;
2528                 break;
2529         case DWC3_DSTS_HIGHSPEED:
2530                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2531                 dwc->gadget.ep0->maxpacket = 64;
2532                 dwc->gadget.speed = USB_SPEED_HIGH;
2533                 break;
2534         case DWC3_DSTS_FULLSPEED2:
2535         case DWC3_DSTS_FULLSPEED1:
2536                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2537                 dwc->gadget.ep0->maxpacket = 64;
2538                 dwc->gadget.speed = USB_SPEED_FULL;
2539                 break;
2540         case DWC3_DSTS_LOWSPEED:
2541                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2542                 dwc->gadget.ep0->maxpacket = 8;
2543                 dwc->gadget.speed = USB_SPEED_LOW;
2544                 break;
2545         }
2546
2547         /* Enable USB2 LPM Capability */
2548
2549         if ((dwc->revision > DWC3_REVISION_194A) &&
2550             (speed != DWC3_DSTS_SUPERSPEED) &&
2551             (speed != DWC3_DSTS_SUPERSPEED_PLUS)) {
2552                 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2553                 reg |= DWC3_DCFG_LPM_CAP;
2554                 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2555
2556                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2557                 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2558
2559                 reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold);
2560
2561                 /*
2562                  * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
2563                  * DCFG.LPMCap is set, core responses with an ACK and the
2564                  * BESL value in the LPM token is less than or equal to LPM
2565                  * NYET threshold.
2566                  */
2567                 WARN_ONCE(dwc->revision < DWC3_REVISION_240A
2568                                 && dwc->has_lpm_erratum,
2569                                 "LPM Erratum not available on dwc3 revisions < 2.40a\n");
2570
2571                 if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A)
2572                         reg |= DWC3_DCTL_LPM_ERRATA(dwc->lpm_nyet_threshold);
2573
2574                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2575         } else {
2576                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2577                 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
2578                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2579         }
2580
2581         dep = dwc->eps[0];
2582         ret = __dwc3_gadget_ep_enable(dep, true, false);
2583         if (ret) {
2584                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2585                 return;
2586         }
2587
2588         dep = dwc->eps[1];
2589         ret = __dwc3_gadget_ep_enable(dep, true, false);
2590         if (ret) {
2591                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2592                 return;
2593         }
2594
2595         /*
2596          * Configure PHY via GUSB3PIPECTLn if required.
2597          *
2598          * Update GTXFIFOSIZn
2599          *
2600          * In both cases reset values should be sufficient.
2601          */
2602 }
2603
2604 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2605 {
2606         /*
2607          * TODO take core out of low power mode when that's
2608          * implemented.
2609          */
2610
2611         if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2612                 spin_unlock(&dwc->lock);
2613                 dwc->gadget_driver->resume(&dwc->gadget);
2614                 spin_lock(&dwc->lock);
2615         }
2616 }
2617
2618 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2619                 unsigned int evtinfo)
2620 {
2621         enum dwc3_link_state    next = evtinfo & DWC3_LINK_STATE_MASK;
2622         unsigned int            pwropt;
2623
2624         /*
2625          * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2626          * Hibernation mode enabled which would show up when device detects
2627          * host-initiated U3 exit.
2628          *
2629          * In that case, device will generate a Link State Change Interrupt
2630          * from U3 to RESUME which is only necessary if Hibernation is
2631          * configured in.
2632          *
2633          * There are no functional changes due to such spurious event and we
2634          * just need to ignore it.
2635          *
2636          * Refers to:
2637          *
2638          * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2639          * operational mode
2640          */
2641         pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
2642         if ((dwc->revision < DWC3_REVISION_250A) &&
2643                         (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
2644                 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
2645                                 (next == DWC3_LINK_STATE_RESUME)) {
2646                         return;
2647                 }
2648         }
2649
2650         /*
2651          * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2652          * on the link partner, the USB session might do multiple entry/exit
2653          * of low power states before a transfer takes place.
2654          *
2655          * Due to this problem, we might experience lower throughput. The
2656          * suggested workaround is to disable DCTL[12:9] bits if we're
2657          * transitioning from U1/U2 to U0 and enable those bits again
2658          * after a transfer completes and there are no pending transfers
2659          * on any of the enabled endpoints.
2660          *
2661          * This is the first half of that workaround.
2662          *
2663          * Refers to:
2664          *
2665          * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2666          * core send LGO_Ux entering U0
2667          */
2668         if (dwc->revision < DWC3_REVISION_183A) {
2669                 if (next == DWC3_LINK_STATE_U0) {
2670                         u32     u1u2;
2671                         u32     reg;
2672
2673                         switch (dwc->link_state) {
2674                         case DWC3_LINK_STATE_U1:
2675                         case DWC3_LINK_STATE_U2:
2676                                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2677                                 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2678                                                 | DWC3_DCTL_ACCEPTU2ENA
2679                                                 | DWC3_DCTL_INITU1ENA
2680                                                 | DWC3_DCTL_ACCEPTU1ENA);
2681
2682                                 if (!dwc->u1u2)
2683                                         dwc->u1u2 = reg & u1u2;
2684
2685                                 reg &= ~u1u2;
2686
2687                                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2688                                 break;
2689                         default:
2690                                 /* do nothing */
2691                                 break;
2692                         }
2693                 }
2694         }
2695
2696         switch (next) {
2697         case DWC3_LINK_STATE_U1:
2698                 if (dwc->speed == USB_SPEED_SUPER)
2699                         dwc3_suspend_gadget(dwc);
2700                 break;
2701         case DWC3_LINK_STATE_U2:
2702         case DWC3_LINK_STATE_U3:
2703                 dwc3_suspend_gadget(dwc);
2704                 break;
2705         case DWC3_LINK_STATE_RESUME:
2706                 dwc3_resume_gadget(dwc);
2707                 break;
2708         default:
2709                 /* do nothing */
2710                 break;
2711         }
2712
2713         dwc->link_state = next;
2714 }
2715
2716 static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
2717                                           unsigned int evtinfo)
2718 {
2719         enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
2720
2721         if (dwc->link_state != next && next == DWC3_LINK_STATE_U3)
2722                 dwc3_suspend_gadget(dwc);
2723
2724         dwc->link_state = next;
2725 }
2726
2727 static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
2728                 unsigned int evtinfo)
2729 {
2730         unsigned int is_ss = evtinfo & BIT(4);
2731
2732         /**
2733          * WORKAROUND: DWC3 revison 2.20a with hibernation support
2734          * have a known issue which can cause USB CV TD.9.23 to fail
2735          * randomly.
2736          *
2737          * Because of this issue, core could generate bogus hibernation
2738          * events which SW needs to ignore.
2739          *
2740          * Refers to:
2741          *
2742          * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
2743          * Device Fallback from SuperSpeed
2744          */
2745         if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
2746                 return;
2747
2748         /* enter hibernation here */
2749 }
2750
2751 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2752                 const struct dwc3_event_devt *event)
2753 {
2754         switch (event->type) {
2755         case DWC3_DEVICE_EVENT_DISCONNECT:
2756                 dwc3_gadget_disconnect_interrupt(dwc);
2757                 break;
2758         case DWC3_DEVICE_EVENT_RESET:
2759                 dwc3_gadget_reset_interrupt(dwc);
2760                 break;
2761         case DWC3_DEVICE_EVENT_CONNECT_DONE:
2762                 dwc3_gadget_conndone_interrupt(dwc);
2763                 break;
2764         case DWC3_DEVICE_EVENT_WAKEUP:
2765                 dwc3_gadget_wakeup_interrupt(dwc);
2766                 break;
2767         case DWC3_DEVICE_EVENT_HIBER_REQ:
2768                 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
2769                                         "unexpected hibernation event\n"))
2770                         break;
2771
2772                 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
2773                 break;
2774         case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2775                 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2776                 break;
2777         case DWC3_DEVICE_EVENT_EOPF:
2778                 /* It changed to be suspend event for version 2.30a and above */
2779                 if (dwc->revision >= DWC3_REVISION_230A) {
2780                         /*
2781                          * Ignore suspend event until the gadget enters into
2782                          * USB_STATE_CONFIGURED state.
2783                          */
2784                         if (dwc->gadget.state >= USB_STATE_CONFIGURED)
2785                                 dwc3_gadget_suspend_interrupt(dwc,
2786                                                 event->event_info);
2787                 }
2788                 break;
2789         case DWC3_DEVICE_EVENT_SOF:
2790         case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2791         case DWC3_DEVICE_EVENT_CMD_CMPL:
2792         case DWC3_DEVICE_EVENT_OVERFLOW:
2793                 break;
2794         default:
2795                 dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2796         }
2797 }
2798
2799 static void dwc3_process_event_entry(struct dwc3 *dwc,
2800                 const union dwc3_event *event)
2801 {
2802         trace_dwc3_event(event->raw, dwc);
2803
2804         /* Endpoint IRQ, handle it and return early */
2805         if (event->type.is_devspec == 0) {
2806                 /* depevt */
2807                 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2808         }
2809
2810         switch (event->type.type) {
2811         case DWC3_EVENT_TYPE_DEV:
2812                 dwc3_gadget_interrupt(dwc, &event->devt);
2813                 break;
2814         /* REVISIT what to do with Carkit and I2C events ? */
2815         default:
2816                 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2817         }
2818 }
2819
2820 static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
2821 {
2822         struct dwc3 *dwc = evt->dwc;
2823         irqreturn_t ret = IRQ_NONE;
2824         int left;
2825         u32 reg;
2826
2827         left = evt->count;
2828
2829         if (!(evt->flags & DWC3_EVENT_PENDING))
2830                 return IRQ_NONE;
2831
2832         while (left > 0) {
2833                 union dwc3_event event;
2834
2835                 event.raw = *(u32 *) (evt->cache + evt->lpos);
2836
2837                 dwc3_process_event_entry(dwc, &event);
2838
2839                 /*
2840                  * FIXME we wrap around correctly to the next entry as
2841                  * almost all entries are 4 bytes in size. There is one
2842                  * entry which has 12 bytes which is a regular entry
2843                  * followed by 8 bytes data. ATM I don't know how
2844                  * things are organized if we get next to the a
2845                  * boundary so I worry about that once we try to handle
2846                  * that.
2847                  */
2848                 evt->lpos = (evt->lpos + 4) % evt->length;
2849                 left -= 4;
2850         }
2851
2852         evt->count = 0;
2853         evt->flags &= ~DWC3_EVENT_PENDING;
2854         ret = IRQ_HANDLED;
2855
2856         /* Unmask interrupt */
2857         reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
2858         reg &= ~DWC3_GEVNTSIZ_INTMASK;
2859         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
2860
2861         if (dwc->imod_interval) {
2862                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
2863                 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
2864         }
2865
2866         return ret;
2867 }
2868
2869 static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
2870 {
2871         struct dwc3_event_buffer *evt = _evt;
2872         struct dwc3 *dwc = evt->dwc;
2873         unsigned long flags;
2874         irqreturn_t ret = IRQ_NONE;
2875
2876         spin_lock_irqsave(&dwc->lock, flags);
2877         ret = dwc3_process_event_buf(evt);
2878         spin_unlock_irqrestore(&dwc->lock, flags);
2879
2880         return ret;
2881 }
2882
2883 static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
2884 {
2885         struct dwc3 *dwc = evt->dwc;
2886         u32 amount;
2887         u32 count;
2888         u32 reg;
2889
2890         if (pm_runtime_suspended(dwc->dev)) {
2891                 pm_runtime_get(dwc->dev);
2892                 disable_irq_nosync(dwc->irq_gadget);
2893                 dwc->pending_events = true;
2894                 return IRQ_HANDLED;
2895         }
2896
2897         count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
2898         count &= DWC3_GEVNTCOUNT_MASK;
2899         if (!count)
2900                 return IRQ_NONE;
2901
2902         evt->count = count;
2903         evt->flags |= DWC3_EVENT_PENDING;
2904
2905         /* Mask interrupt */
2906         reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
2907         reg |= DWC3_GEVNTSIZ_INTMASK;
2908         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
2909
2910         amount = min(count, evt->length - evt->lpos);
2911         memcpy(evt->cache + evt->lpos, evt->buf + evt->lpos, amount);
2912
2913         if (amount < count)
2914                 memcpy(evt->cache, evt->buf, count - amount);
2915
2916         dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count);
2917
2918         return IRQ_WAKE_THREAD;
2919 }
2920
2921 static irqreturn_t dwc3_interrupt(int irq, void *_evt)
2922 {
2923         struct dwc3_event_buffer        *evt = _evt;
2924
2925         return dwc3_check_event_buf(evt);
2926 }
2927
2928 static int dwc3_gadget_get_irq(struct dwc3 *dwc)
2929 {
2930         struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
2931         int irq;
2932
2933         irq = platform_get_irq_byname(dwc3_pdev, "peripheral");
2934         if (irq > 0)
2935                 goto out;
2936
2937         if (irq == -EPROBE_DEFER)
2938                 goto out;
2939
2940         irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
2941         if (irq > 0)
2942                 goto out;
2943
2944         if (irq == -EPROBE_DEFER)
2945                 goto out;
2946
2947         irq = platform_get_irq(dwc3_pdev, 0);
2948         if (irq > 0)
2949                 goto out;
2950
2951         if (irq != -EPROBE_DEFER)
2952                 dev_err(dwc->dev, "missing peripheral IRQ\n");
2953
2954         if (!irq)
2955                 irq = -EINVAL;
2956
2957 out:
2958         return irq;
2959 }
2960
2961 /**
2962  * dwc3_gadget_init - Initializes gadget related registers
2963  * @dwc: pointer to our controller context structure
2964  *
2965  * Returns 0 on success otherwise negative errno.
2966  */
2967 int dwc3_gadget_init(struct dwc3 *dwc)
2968 {
2969         int ret;
2970         int irq;
2971
2972         irq = dwc3_gadget_get_irq(dwc);
2973         if (irq < 0) {
2974                 ret = irq;
2975                 goto err0;
2976         }
2977
2978         dwc->irq_gadget = irq;
2979
2980         dwc->ctrl_req = dma_alloc_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
2981                         &dwc->ctrl_req_addr, GFP_KERNEL);
2982         if (!dwc->ctrl_req) {
2983                 dev_err(dwc->dev, "failed to allocate ctrl request\n");
2984                 ret = -ENOMEM;
2985                 goto err0;
2986         }
2987
2988         dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
2989                                           sizeof(*dwc->ep0_trb) * 2,
2990                                           &dwc->ep0_trb_addr, GFP_KERNEL);
2991         if (!dwc->ep0_trb) {
2992                 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
2993                 ret = -ENOMEM;
2994                 goto err1;
2995         }
2996
2997         dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
2998         if (!dwc->setup_buf) {
2999                 ret = -ENOMEM;
3000                 goto err2;
3001         }
3002
3003         dwc->ep0_bounce = dma_alloc_coherent(dwc->sysdev,
3004                         DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
3005                         GFP_KERNEL);
3006         if (!dwc->ep0_bounce) {
3007                 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
3008                 ret = -ENOMEM;
3009                 goto err3;
3010         }
3011
3012         dwc->zlp_buf = kzalloc(DWC3_ZLP_BUF_SIZE, GFP_KERNEL);
3013         if (!dwc->zlp_buf) {
3014                 ret = -ENOMEM;
3015                 goto err4;
3016         }
3017
3018         init_completion(&dwc->ep0_in_setup);
3019
3020         dwc->gadget.ops                 = &dwc3_gadget_ops;
3021         dwc->gadget.speed               = USB_SPEED_UNKNOWN;
3022         dwc->gadget.sg_supported        = true;
3023         dwc->gadget.name                = "dwc3-gadget";
3024         dwc->gadget.is_otg              = dwc->dr_mode == USB_DR_MODE_OTG;
3025
3026         /*
3027          * FIXME We might be setting max_speed to <SUPER, however versions
3028          * <2.20a of dwc3 have an issue with metastability (documented
3029          * elsewhere in this driver) which tells us we can't set max speed to
3030          * anything lower than SUPER.
3031          *
3032          * Because gadget.max_speed is only used by composite.c and function
3033          * drivers (i.e. it won't go into dwc3's registers) we are allowing this
3034          * to happen so we avoid sending SuperSpeed Capability descriptor
3035          * together with our BOS descriptor as that could confuse host into
3036          * thinking we can handle super speed.
3037          *
3038          * Note that, in fact, we won't even support GetBOS requests when speed
3039          * is less than super speed because we don't have means, yet, to tell
3040          * composite.c that we are USB 2.0 + LPM ECN.
3041          */
3042         if (dwc->revision < DWC3_REVISION_220A)
3043                 dev_info(dwc->dev, "changing max_speed on rev %08x\n",
3044                                 dwc->revision);
3045
3046         dwc->gadget.max_speed           = dwc->maximum_speed;
3047
3048         /*
3049          * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
3050          * on ep out.
3051          */
3052         dwc->gadget.quirk_ep_out_aligned_size = true;
3053
3054         /*
3055          * REVISIT: Here we should clear all pending IRQs to be
3056          * sure we're starting from a well known location.
3057          */
3058
3059         ret = dwc3_gadget_init_endpoints(dwc);
3060         if (ret)
3061                 goto err5;
3062
3063         ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
3064         if (ret) {
3065                 dev_err(dwc->dev, "failed to register udc\n");
3066                 goto err5;
3067         }
3068
3069         return 0;
3070
3071 err5:
3072         kfree(dwc->zlp_buf);
3073
3074 err4:
3075         dwc3_gadget_free_endpoints(dwc);
3076         dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
3077                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
3078
3079 err3:
3080         kfree(dwc->setup_buf);
3081
3082 err2:
3083         dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
3084                         dwc->ep0_trb, dwc->ep0_trb_addr);
3085
3086 err1:
3087         dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
3088                         dwc->ctrl_req, dwc->ctrl_req_addr);
3089
3090 err0:
3091         return ret;
3092 }
3093
3094 /* -------------------------------------------------------------------------- */
3095
3096 void dwc3_gadget_exit(struct dwc3 *dwc)
3097 {
3098         usb_del_gadget_udc(&dwc->gadget);
3099
3100         dwc3_gadget_free_endpoints(dwc);
3101
3102         dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
3103                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
3104
3105         kfree(dwc->setup_buf);
3106         kfree(dwc->zlp_buf);
3107
3108         dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
3109                         dwc->ep0_trb, dwc->ep0_trb_addr);
3110
3111         dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
3112                         dwc->ctrl_req, dwc->ctrl_req_addr);
3113 }
3114
3115 int dwc3_gadget_suspend(struct dwc3 *dwc)
3116 {
3117         int ret;
3118
3119         if (!dwc->gadget_driver)
3120                 return 0;
3121
3122         ret = dwc3_gadget_run_stop(dwc, false, false);
3123         if (ret < 0)
3124                 return ret;
3125
3126         dwc3_disconnect_gadget(dwc);
3127         __dwc3_gadget_stop(dwc);
3128
3129         return 0;
3130 }
3131
3132 int dwc3_gadget_resume(struct dwc3 *dwc)
3133 {
3134         int                     ret;
3135
3136         if (!dwc->gadget_driver)
3137                 return 0;
3138
3139         ret = __dwc3_gadget_start(dwc);
3140         if (ret < 0)
3141                 goto err0;
3142
3143         ret = dwc3_gadget_run_stop(dwc, true, false);
3144         if (ret < 0)
3145                 goto err1;
3146
3147         return 0;
3148
3149 err1:
3150         __dwc3_gadget_stop(dwc);
3151
3152 err0:
3153         return ret;
3154 }
3155
3156 void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
3157 {
3158         if (dwc->pending_events) {
3159                 dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf);
3160                 dwc->pending_events = false;
3161                 enable_irq(dwc->irq_gadget);
3162         }
3163 }