drivers/usb/dwc3/gadget.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /**
   3  * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
   4  *
   5  * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
   6  *
   7  * Authors: Felipe Balbi <[email protected]>,
   8  *          Sebastian Andrzej Siewior <[email protected]>
   9  *
  10  * Taken from Linux Kernel v3.19-rc1 (drivers/usb/dwc3/gadget.c) and ported
  11  * to uboot.
  12  *
  13  * commit 8e74475b0e : usb: dwc3: gadget: use udc-core's reset notifier
  14  */
  15
  16 #include <common.h>
  17 #include <malloc.h>
  18 #include <asm/dma-mapping.h>
  19 #include <linux/bug.h>
  20 #include <linux/list.h>
  21
  22 #include <linux/usb/ch9.h>
  23 #include <linux/usb/gadget.h>
  24
  25 #include "core.h"
  26 #include "gadget.h"
  27 #include "io.h"
  28
  29 #include "linux-compat.h"
  30
  31 /**
  32  * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
  33  * @dwc: pointer to our context structure
  34  * @mode: the mode to set (J, K SE0 NAK, Force Enable)
  35  *
  36  * Caller should take care of locking. This function will
  37  * return 0 on success or -EINVAL if wrong Test Selector
  38  * is passed
  39  */
  40 int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
  41 {
  42         u32             reg;
  43
  44         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
  45         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
  46
  47         switch (mode) {
  48         case TEST_J:
  49         case TEST_K:
  50         case TEST_SE0_NAK:
  51         case TEST_PACKET:
  52         case TEST_FORCE_EN:
  53                 reg |= mode << 1;
  54                 break;
  55         default:
  56                 return -EINVAL;
  57         }
  58
  59         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
  60
  61         return 0;
  62 }
  63
  64 /**
  65  * dwc3_gadget_get_link_state - Gets current state of USB Link
  66  * @dwc: pointer to our context structure
  67  *
  68  * Caller should take care of locking. This function will
  69  * return the link state on success (>= 0) or -ETIMEDOUT.
  70  */
  71 int dwc3_gadget_get_link_state(struct dwc3 *dwc)
  72 {
  73         u32             reg;
  74
  75         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
  76
  77         return DWC3_DSTS_USBLNKST(reg);
  78 }
  79
  80 /**
  81  * dwc3_gadget_set_link_state - Sets USB Link to a particular State
  82  * @dwc: pointer to our context structure
  83  * @state: the state to put link into
  84  *
  85  * Caller should take care of locking. This function will
  86  * return 0 on success or -ETIMEDOUT.
  87  */
  88 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
  89 {
  90         int             retries = 10000;
  91         u32             reg;
  92
  93         /*
  94          * Wait until device controller is ready. Only applies to 1.94a and
  95          * later RTL.
  96          */
  97         if (dwc->revision >= DWC3_REVISION_194A) {
  98                 while (--retries) {
  99                         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 100                         if (reg & DWC3_DSTS_DCNRD)
 101                                 udelay(5);
 102                         else
 103                                 break;
 104                 }
 105
 106                 if (retries <= 0)
 107                         return -ETIMEDOUT;
 108         }
 109
 110         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 111         reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
 112
 113         /* set requested state */
 114         reg |= DWC3_DCTL_ULSTCHNGREQ(state);
 115         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 116
 117         /*
 118          * The following code is racy when called from dwc3_gadget_wakeup,
 119          * and is not needed, at least on newer versions
 120          */
 121         if (dwc->revision >= DWC3_REVISION_194A)
 122                 return 0;
 123
 124         /* wait for a change in DSTS */
 125         retries = 10000;
 126         while (--retries) {
 127                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 128
 129                 if (DWC3_DSTS_USBLNKST(reg) == state)
 130                         return 0;
 131
 132                 udelay(5);
 133         }
 134
 135         dev_vdbg(dwc->dev, "link state change request timed out\n");
 136
 137         return -ETIMEDOUT;
 138 }
 139
 140 /**
 141  * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
 142  * @dwc: pointer to our context structure
 143  *
 144  * This function will a best effort FIFO allocation in order
 145  * to improve FIFO usage and throughput, while still allowing
 146  * us to enable as many endpoints as possible.
 147  *
 148  * Keep in mind that this operation will be highly dependent
 149  * on the configured size for RAM1 - which contains TxFifo -,
 150  * the amount of endpoints enabled on coreConsultant tool, and
 151  * the width of the Master Bus.
 152  *
 153  * In the ideal world, we would always be able to satisfy the
 154  * following equation:
 155  *
 156  * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
 157  * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
 158  *
 159  * Unfortunately, due to many variables that's not always the case.
 160  */
 161 int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
 162 {
 163         int             last_fifo_depth = 0;
 164         int             fifo_size;
 165         int             mdwidth;
 166         int             num;
 167
 168         if (!dwc->needs_fifo_resize)
 169                 return 0;
 170
 171         mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
 172
 173         /* MDWIDTH is represented in bits, we need it in bytes */
 174         mdwidth >>= 3;
 175
 176         /*
 177          * FIXME For now we will only allocate 1 wMaxPacketSize space
 178          * for each enabled endpoint, later patches will come to
 179          * improve this algorithm so that we better use the internal
 180          * FIFO space
 181          */
 182         for (num = 0; num < dwc->num_in_eps; num++) {
 183                 /* bit0 indicates direction; 1 means IN ep */
 184                 struct dwc3_ep  *dep = dwc->eps[(num << 1) | 1];
 185                 int             mult = 1;
 186                 int             tmp;
 187
 188                 if (!(dep->flags & DWC3_EP_ENABLED))
 189                         continue;
 190
 191                 if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
 192                                 || usb_endpoint_xfer_isoc(dep->endpoint.desc))
 193                         mult = 3;
 194
 195                 /*
 196                  * REVISIT: the following assumes we will always have enough
 197                  * space available on the FIFO RAM for all possible use cases.
 198                  * Make sure that's true somehow and change FIFO allocation
 199                  * accordingly.
 200                  *
 201                  * If we have Bulk or Isochronous endpoints, we want
 202                  * them to be able to be very, very fast. So we're giving
 203                  * those endpoints a fifo_size which is enough for 3 full
 204                  * packets
 205                  */
 206                 tmp = mult * (dep->endpoint.maxpacket + mdwidth);
 207                 tmp += mdwidth;
 208
 209                 fifo_size = DIV_ROUND_UP(tmp, mdwidth);
 210
 211                 fifo_size |= (last_fifo_depth << 16);
 212
 213                 dev_vdbg(dwc->dev, "%s: Fifo Addr %04x Size %d\n",
 214                                 dep->name, last_fifo_depth, fifo_size & 0xffff);
 215
 216                 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num), fifo_size);
 217
 218                 last_fifo_depth += (fifo_size & 0xffff);
 219         }
 220
 221         return 0;
 222 }
 223
 224 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 225                 int status)
 226 {
 227         struct dwc3                     *dwc = dep->dwc;
 228
 229         if (req->queued) {
 230                 dep->busy_slot++;
 231                 /*
 232                  * Skip LINK TRB. We can't use req->trb and check for
 233                  * DWC3_TRBCTL_LINK_TRB because it points the TRB we
 234                  * just completed (not the LINK TRB).
 235                  */
 236                 if (((dep->busy_slot & DWC3_TRB_MASK) ==
 237                         DWC3_TRB_NUM- 1) &&
 238                         usb_endpoint_xfer_isoc(dep->endpoint.desc))
 239                         dep->busy_slot++;
 240                 req->queued = false;
 241         }
 242
 243         list_del(&req->list);
 244         req->trb = NULL;
 245         if (req->request.length)
 246                 dwc3_flush_cache((uintptr_t)req->request.dma, req->request.length);
 247
 248         if (req->request.status == -EINPROGRESS)
 249                 req->request.status = status;
 250
 251         if (dwc->ep0_bounced && dep->number == 0)
 252                 dwc->ep0_bounced = false;
 253         else
 254                 usb_gadget_unmap_request(&dwc->gadget, &req->request,
 255                                 req->direction);
 256
 257         dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
 258                         req, dep->name, req->request.actual,
 259                         req->request.length, status);
 260
 261         spin_unlock(&dwc->lock);
 262         usb_gadget_giveback_request(&dep->endpoint, &req->request);
 263         spin_lock(&dwc->lock);
 264 }
 265
 266 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
 267 {
 268         u32             timeout = 500;
 269         u32             reg;
 270
 271         dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
 272         dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
 273
 274         do {
 275                 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
 276                 if (!(reg & DWC3_DGCMD_CMDACT)) {
 277                         dev_vdbg(dwc->dev, "Command Complete --> %d\n",
 278                                         DWC3_DGCMD_STATUS(reg));
 279                         return 0;
 280                 }
 281
 282                 /*
 283                  * We can't sleep here, because it's also called from
 284                  * interrupt context.
 285                  */
 286                 timeout--;
 287                 if (!timeout)
 288                         return -ETIMEDOUT;
 289                 udelay(1);
 290         } while (1);
 291 }
 292
 293 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
 294                 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
 295 {
 296         u32                     timeout = 500;
 297         u32                     reg;
 298
 299         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
 300         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
 301         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
 302
 303         dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
 304         do {
 305                 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
 306                 if (!(reg & DWC3_DEPCMD_CMDACT)) {
 307                         dev_vdbg(dwc->dev, "Command Complete --> %d\n",
 308                                         DWC3_DEPCMD_STATUS(reg));
 309                         return 0;
 310                 }
 311
 312                 /*
 313                  * We can't sleep here, because it is also called from
 314                  * interrupt context.
 315                  */
 316                 timeout--;
 317                 if (!timeout)
 318                         return -ETIMEDOUT;
 319
 320                 udelay(1);
 321         } while (1);
 322 }
 323
 324 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
 325                 struct dwc3_trb *trb)
 326 {
 327         u32             offset = (char *) trb - (char *) dep->trb_pool;
 328
 329         return dep->trb_pool_dma + offset;
 330 }
 331
 332 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
 333 {
 334         if (dep->trb_pool)
 335                 return 0;
 336
 337         if (dep->number == 0 || dep->number == 1)
 338                 return 0;
 339
 340         dep->trb_pool = dma_alloc_coherent(sizeof(struct dwc3_trb) *
 341                                            DWC3_TRB_NUM,
 342                                            (unsigned long *)&dep->trb_pool_dma);
 343         if (!dep->trb_pool) {
 344                 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
 345                                 dep->name);
 346                 return -ENOMEM;
 347         }
 348
 349         return 0;
 350 }
 351
 352 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
 353 {
 354         dma_free_coherent(dep->trb_pool);
 355
 356         dep->trb_pool = NULL;
 357         dep->trb_pool_dma = 0;
 358 }
 359
 360 static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
 361 {
 362         struct dwc3_gadget_ep_cmd_params params;
 363         u32                     cmd;
 364
 365         memset(&params, 0x00, sizeof(params));
 366
 367         if (dep->number != 1) {
 368                 cmd = DWC3_DEPCMD_DEPSTARTCFG;
 369                 /* XferRscIdx == 0 for ep0 and 2 for the remaining */
 370                 if (dep->number > 1) {
 371                         if (dwc->start_config_issued)
 372                                 return 0;
 373                         dwc->start_config_issued = true;
 374                         cmd |= DWC3_DEPCMD_PARAM(2);
 375                 }
 376
 377                 return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, &params);
 378         }
 379
 380         return 0;
 381 }
 382
 383 static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
 384                 const struct usb_endpoint_descriptor *desc,
 385                 const struct usb_ss_ep_comp_descriptor *comp_desc,
 386                 bool ignore, bool restore)
 387 {
 388         struct dwc3_gadget_ep_cmd_params params;
 389
 390         memset(&params, 0x00, sizeof(params));
 391
 392         params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
 393                 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
 394
 395         /* Burst size is only needed in SuperSpeed mode */
 396         if (dwc->gadget.speed == USB_SPEED_SUPER) {
 397                 u32 burst = dep->endpoint.maxburst - 1;
 398
 399                 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst);
 400         }
 401
 402         if (ignore)
 403                 params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
 404
 405         if (restore) {
 406                 params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
 407                 params.param2 |= dep->saved_state;
 408         }
 409
 410         params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
 411                 | DWC3_DEPCFG_XFER_NOT_READY_EN;
 412
 413         if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
 414                 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
 415                         | DWC3_DEPCFG_STREAM_EVENT_EN;
 416                 dep->stream_capable = true;
 417         }
 418
 419         if (!usb_endpoint_xfer_control(desc))
 420                 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
 421
 422         /*
 423          * We are doing 1:1 mapping for endpoints, meaning
 424          * Physical Endpoints 2 maps to Logical Endpoint 2 and
 425          * so on. We consider the direction bit as part of the physical
 426          * endpoint number. So USB endpoint 0x81 is 0x03.
 427          */
 428         params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
 429
 430         /*
 431          * We must use the lower 16 TX FIFOs even though
 432          * HW might have more
 433          */
 434         if (dep->direction)
 435                 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
 436
 437         if (desc->bInterval) {
 438                 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
 439                 dep->interval = 1 << (desc->bInterval - 1);
 440         }
 441
 442         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 443                         DWC3_DEPCMD_SETEPCONFIG, &params);
 444 }
 445
 446 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
 447 {
 448         struct dwc3_gadget_ep_cmd_params params;
 449
 450         memset(&params, 0x00, sizeof(params));
 451
 452         params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
 453
 454         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 455                         DWC3_DEPCMD_SETTRANSFRESOURCE, &params);
 456 }
 457
 458 /**
 459  * __dwc3_gadget_ep_enable - Initializes a HW endpoint
 460  * @dep: endpoint to be initialized
 461  * @desc: USB Endpoint Descriptor
 462  *
 463  * Caller should take care of locking
 464  */
 465 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
 466                 const struct usb_endpoint_descriptor *desc,
 467                 const struct usb_ss_ep_comp_descriptor *comp_desc,
 468                 bool ignore, bool restore)
 469 {
 470         struct dwc3             *dwc = dep->dwc;
 471         u32                     reg;
 472         int                     ret;
 473
 474         dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);
 475
 476         if (!(dep->flags & DWC3_EP_ENABLED)) {
 477                 ret = dwc3_gadget_start_config(dwc, dep);
 478                 if (ret)
 479                         return ret;
 480         }
 481
 482         ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore,
 483                         restore);
 484         if (ret)
 485                 return ret;
 486
 487         if (!(dep->flags & DWC3_EP_ENABLED)) {
 488                 struct dwc3_trb *trb_st_hw;
 489                 struct dwc3_trb *trb_link;
 490
 491                 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
 492                 if (ret)
 493                         return ret;
 494
 495                 dep->endpoint.desc = desc;
 496                 dep->comp_desc = comp_desc;
 497                 dep->type = usb_endpoint_type(desc);
 498                 dep->flags |= DWC3_EP_ENABLED;
 499
 500                 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 501                 reg |= DWC3_DALEPENA_EP(dep->number);
 502                 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 503
 504                 if (!usb_endpoint_xfer_isoc(desc))
 505                         return 0;
 506
 507                 /* Link TRB for ISOC. The HWO bit is never reset */
 508                 trb_st_hw = &dep->trb_pool[0];
 509
 510                 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
 511                 memset(trb_link, 0, sizeof(*trb_link));
 512
 513                 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 514                 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 515                 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
 516                 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
 517         }
 518
 519         return 0;
 520 }
 521
 522 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
 523 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 524 {
 525         struct dwc3_request             *req;
 526
 527         if (!list_empty(&dep->req_queued)) {
 528                 dwc3_stop_active_transfer(dwc, dep->number, true);
 529
 530                 /* - giveback all requests to gadget driver */
 531                 while (!list_empty(&dep->req_queued)) {
 532                         req = next_request(&dep->req_queued);
 533
 534                         dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 535                 }
 536         }
 537
 538         while (!list_empty(&dep->request_list)) {
 539                 req = next_request(&dep->request_list);
 540
 541                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 542         }
 543 }
 544
 545 /**
 546  * __dwc3_gadget_ep_disable - Disables a HW endpoint
 547  * @dep: the endpoint to disable
 548  *
 549  * This function also removes requests which are currently processed ny the
 550  * hardware and those which are not yet scheduled.
 551  * Caller should take care of locking.
 552  */
 553 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
 554 {
 555         struct dwc3             *dwc = dep->dwc;
 556         u32                     reg;
 557
 558         dwc3_remove_requests(dwc, dep);
 559
 560         /* make sure HW endpoint isn't stalled */
 561         if (dep->flags & DWC3_EP_STALL)
 562                 __dwc3_gadget_ep_set_halt(dep, 0, false);
 563
 564         reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 565         reg &= ~DWC3_DALEPENA_EP(dep->number);
 566         dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 567
 568         dep->stream_capable = false;
 569         dep->endpoint.desc = NULL;
 570         dep->comp_desc = NULL;
 571         dep->type = 0;
 572         dep->flags = 0;
 573
 574         return 0;
 575 }
 576
 577 /* -------------------------------------------------------------------------- */
 578
 579 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
 580                 const struct usb_endpoint_descriptor *desc)
 581 {
 582         return -EINVAL;
 583 }
 584
 585 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
 586 {
 587         return -EINVAL;
 588 }
 589
 590 /* -------------------------------------------------------------------------- */
 591
 592 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
 593                 const struct usb_endpoint_descriptor *desc)
 594 {
 595         struct dwc3_ep                  *dep;
 596         unsigned long                   flags;
 597         int                             ret;
 598
 599         if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
 600                 pr_debug("dwc3: invalid parameters\n");
 601                 return -EINVAL;
 602         }
 603
 604         if (!desc->wMaxPacketSize) {
 605                 pr_debug("dwc3: missing wMaxPacketSize\n");
 606                 return -EINVAL;
 607         }
 608
 609         dep = to_dwc3_ep(ep);
 610
 611         if (dep->flags & DWC3_EP_ENABLED) {
 612                 WARN(true, "%s is already enabled\n",
 613                                 dep->name);
 614                 return 0;
 615         }
 616
 617         switch (usb_endpoint_type(desc)) {
 618         case USB_ENDPOINT_XFER_CONTROL:
 619                 strlcat(dep->name, "-control", sizeof(dep->name));
 620                 break;
 621         case USB_ENDPOINT_XFER_ISOC:
 622                 strlcat(dep->name, "-isoc", sizeof(dep->name));
 623                 break;
 624         case USB_ENDPOINT_XFER_BULK:
 625                 strlcat(dep->name, "-bulk", sizeof(dep->name));
 626                 break;
 627         case USB_ENDPOINT_XFER_INT:
 628                 strlcat(dep->name, "-int", sizeof(dep->name));
 629                 break;
 630         default:
 631                 dev_err(dwc->dev, "invalid endpoint transfer type\n");
 632         }
 633
 634         spin_lock_irqsave(&dwc->lock, flags);
 635         ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false, false);
 636         spin_unlock_irqrestore(&dwc->lock, flags);
 637
 638         return ret;
 639 }
 640
 641 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
 642 {
 643         struct dwc3_ep                  *dep;
 644         unsigned long                   flags;
 645         int                             ret;
 646
 647         if (!ep) {
 648                 pr_debug("dwc3: invalid parameters\n");
 649                 return -EINVAL;
 650         }
 651
 652         dep = to_dwc3_ep(ep);
 653
 654         if (!(dep->flags & DWC3_EP_ENABLED)) {
 655                 WARN(true, "%s is already disabled\n",
 656                                 dep->name);
 657                 return 0;
 658         }
 659
 660         snprintf(dep->name, sizeof(dep->name), "ep%d%s",
 661                         dep->number >> 1,
 662                         (dep->number & 1) ? "in" : "out");
 663
 664         spin_lock_irqsave(&dwc->lock, flags);
 665         ret = __dwc3_gadget_ep_disable(dep);
 666         spin_unlock_irqrestore(&dwc->lock, flags);
 667
 668         return ret;
 669 }
 670
 671 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
 672         gfp_t gfp_flags)
 673 {
 674         struct dwc3_request             *req;
 675         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 676
 677         req = kzalloc(sizeof(*req), gfp_flags);
 678         if (!req)
 679                 return NULL;
 680
 681         req->epnum      = dep->number;
 682         req->dep        = dep;
 683
 684         return &req->request;
 685 }
 686
 687 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
 688                 struct usb_request *request)
 689 {
 690         struct dwc3_request             *req = to_dwc3_request(request);
 691
 692         kfree(req);
 693 }
 694
 695 /**
 696  * dwc3_prepare_one_trb - setup one TRB from one request
 697  * @dep: endpoint for which this request is prepared
 698  * @req: dwc3_request pointer
 699  */
 700 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
 701                 struct dwc3_request *req, dma_addr_t dma,
 702                 unsigned length, unsigned last, unsigned chain, unsigned node)
 703 {
 704         struct dwc3_trb         *trb;
 705
 706         dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n",
 707                         dep->name, req, (unsigned long long) dma,
 708                         length, last ? " last" : "",
 709                         chain ? " chain" : "");
 710
 711
 712         trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
 713
 714         if (!req->trb) {
 715                 dwc3_gadget_move_request_queued(req);
 716                 req->trb = trb;
 717                 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
 718                 req->start_slot = dep->free_slot & DWC3_TRB_MASK;
 719         }
 720
 721         dep->free_slot++;
 722         /* Skip the LINK-TRB on ISOC */
 723         if (((dep->free_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
 724                         usb_endpoint_xfer_isoc(dep->endpoint.desc))
 725                 dep->free_slot++;
 726
 727         trb->size = DWC3_TRB_SIZE_LENGTH(length);
 728         trb->bpl = lower_32_bits(dma);
 729         trb->bph = upper_32_bits(dma);
 730
 731         switch (usb_endpoint_type(dep->endpoint.desc)) {
 732         case USB_ENDPOINT_XFER_CONTROL:
 733                 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
 734                 break;
 735
 736         case USB_ENDPOINT_XFER_ISOC:
 737                 if (!node)
 738                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
 739                 else
 740                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
 741                 break;
 742
 743         case USB_ENDPOINT_XFER_BULK:
 744         case USB_ENDPOINT_XFER_INT:
 745                 trb->ctrl = DWC3_TRBCTL_NORMAL;
 746                 break;
 747         default:
 748                 /*
 749                  * This is only possible with faulty memory because we
 750                  * checked it already :)
 751                  */
 752                 BUG();
 753         }
 754
 755         if (!req->request.no_interrupt && !chain)
 756                 trb->ctrl |= DWC3_TRB_CTRL_IOC;
 757
 758         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 759                 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
 760                 trb->ctrl |= DWC3_TRB_CTRL_CSP;
 761         } else if (last) {
 762                 trb->ctrl |= DWC3_TRB_CTRL_LST;
 763         }
 764
 765         if (chain)
 766                 trb->ctrl |= DWC3_TRB_CTRL_CHN;
 767
 768         if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
 769                 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
 770
 771         trb->ctrl |= DWC3_TRB_CTRL_HWO;
 772
 773         dwc3_flush_cache((uintptr_t)dma, length);
 774         dwc3_flush_cache((uintptr_t)trb, sizeof(*trb));
 775 }
 776
 777 /*
 778  * dwc3_prepare_trbs - setup TRBs from requests
 779  * @dep: endpoint for which requests are being prepared
 780  * @starting: true if the endpoint is idle and no requests are queued.
 781  *
 782  * The function goes through the requests list and sets up TRBs for the
 783  * transfers. The function returns once there are no more TRBs available or
 784  * it runs out of requests.
 785  */
 786 static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting)
 787 {
 788         struct dwc3_request     *req, *n;
 789         u32                     trbs_left;
 790         u32                     max;
 791
 792         BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
 793
 794         /* the first request must not be queued */
 795         trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
 796
 797         /* Can't wrap around on a non-isoc EP since there's no link TRB */
 798         if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 799                 max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK);
 800                 if (trbs_left > max)
 801                         trbs_left = max;
 802         }
 803
 804         /*
 805          * If busy & slot are equal than it is either full or empty. If we are
 806          * starting to process requests then we are empty. Otherwise we are
 807          * full and don't do anything
 808          */
 809         if (!trbs_left) {
 810                 if (!starting)
 811                         return;
 812                 trbs_left = DWC3_TRB_NUM;
 813                 /*
 814                  * In case we start from scratch, we queue the ISOC requests
 815                  * starting from slot 1. This is done because we use ring
 816                  * buffer and have no LST bit to stop us. Instead, we place
 817                  * IOC bit every TRB_NUM/4. We try to avoid having an interrupt
 818                  * after the first request so we start at slot 1 and have
 819                  * 7 requests proceed before we hit the first IOC.
 820                  * Other transfer types don't use the ring buffer and are
 821                  * processed from the first TRB until the last one. Since we
 822                  * don't wrap around we have to start at the beginning.
 823                  */
 824                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 825                         dep->busy_slot = 1;
 826                         dep->free_slot = 1;
 827                 } else {
 828                         dep->busy_slot = 0;
 829                         dep->free_slot = 0;
 830                 }
 831         }
 832
 833         /* The last TRB is a link TRB, not used for xfer */
 834         if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc))
 835                 return;
 836
 837         list_for_each_entry_safe(req, n, &dep->request_list, list) {
 838                 unsigned        length;
 839                 dma_addr_t      dma;
 840
 841                 dma = req->request.dma;
 842                 length = req->request.length;
 843
 844                 dwc3_prepare_one_trb(dep, req, dma, length,
 845                                      true, false, 0);
 846
 847                 break;
 848         }
 849 }
 850
 851 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
 852                 int start_new)
 853 {
 854         struct dwc3_gadget_ep_cmd_params params;
 855         struct dwc3_request             *req;
 856         struct dwc3                     *dwc = dep->dwc;
 857         int                             ret;
 858         u32                             cmd;
 859
 860         if (start_new && (dep->flags & DWC3_EP_BUSY)) {
 861                 dev_vdbg(dwc->dev, "%s: endpoint busy\n", dep->name);
 862                 return -EBUSY;
 863         }
 864         dep->flags &= ~DWC3_EP_PENDING_REQUEST;
 865
 866         /*
 867          * If we are getting here after a short-out-packet we don't enqueue any
 868          * new requests as we try to set the IOC bit only on the last request.
 869          */
 870         if (start_new) {
 871                 if (list_empty(&dep->req_queued))
 872                         dwc3_prepare_trbs(dep, start_new);
 873
 874                 /* req points to the first request which will be sent */
 875                 req = next_request(&dep->req_queued);
 876         } else {
 877                 dwc3_prepare_trbs(dep, start_new);
 878
 879                 /*
 880                  * req points to the first request where HWO changed from 0 to 1
 881                  */
 882                 req = next_request(&dep->req_queued);
 883         }
 884         if (!req) {
 885                 dep->flags |= DWC3_EP_PENDING_REQUEST;
 886                 return 0;
 887         }
 888
 889         memset(&params, 0, sizeof(params));
 890
 891         if (start_new) {
 892                 params.param0 = upper_32_bits(req->trb_dma);
 893                 params.param1 = lower_32_bits(req->trb_dma);
 894                 cmd = DWC3_DEPCMD_STARTTRANSFER;
 895         } else {
 896                 cmd = DWC3_DEPCMD_UPDATETRANSFER;
 897         }
 898
 899         cmd |= DWC3_DEPCMD_PARAM(cmd_param);
 900         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
 901         if (ret < 0) {
 902                 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
 903
 904                 /*
 905                  * FIXME we need to iterate over the list of requests
 906                  * here and stop, unmap, free and del each of the linked
 907                  * requests instead of what we do now.
 908                  */
 909                 usb_gadget_unmap_request(&dwc->gadget, &req->request,
 910                                 req->direction);
 911                 list_del(&req->list);
 912                 return ret;
 913         }
 914
 915         dep->flags |= DWC3_EP_BUSY;
 916
 917         if (start_new) {
 918                 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
 919                                 dep->number);
 920                 WARN_ON_ONCE(!dep->resource_index);
 921         }
 922
 923         return 0;
 924 }
 925
 926 static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
 927                 struct dwc3_ep *dep, u32 cur_uf)
 928 {
 929         u32 uf;
 930
 931         if (list_empty(&dep->request_list)) {
 932                 dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n",
 933                         dep->name);
 934                 dep->flags |= DWC3_EP_PENDING_REQUEST;
 935                 return;
 936         }
 937
 938         /* 4 micro frames in the future */
 939         uf = cur_uf + dep->interval * 4;
 940
 941         __dwc3_gadget_kick_transfer(dep, uf, 1);
 942 }
 943
 944 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
 945                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
 946 {
 947         u32 cur_uf, mask;
 948
 949         mask = ~(dep->interval - 1);
 950         cur_uf = event->parameters & mask;
 951
 952         __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
 953 }
 954
 955 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
 956 {
 957         struct dwc3             *dwc = dep->dwc;
 958         int                     ret;
 959
 960         req->request.actual     = 0;
 961         req->request.status     = -EINPROGRESS;
 962         req->direction          = dep->direction;
 963         req->epnum              = dep->number;
 964
 965         /*
 966          * DWC3 hangs on OUT requests smaller than maxpacket size,
 967          * so HACK the request length
 968          */
 969         if (dep->direction == 0 &&
 970             req->request.length < dep->endpoint.maxpacket)
 971                 req->request.length = dep->endpoint.maxpacket;
 972
 973         /*
 974          * We only add to our list of requests now and
 975          * start consuming the list once we get XferNotReady
 976          * IRQ.
 977          *
 978          * That way, we avoid doing anything that we don't need
 979          * to do now and defer it until the point we receive a
 980          * particular token from the Host side.
 981          *
 982          * This will also avoid Host cancelling URBs due to too
 983          * many NAKs.
 984          */
 985         ret = usb_gadget_map_request(&dwc->gadget, &req->request,
 986                         dep->direction);
 987         if (ret)
 988                 return ret;
 989
 990         list_add_tail(&req->list, &dep->request_list);
 991
 992         /*
 993          * There are a few special cases:
 994          *
 995          * 1. XferNotReady with empty list of requests. We need to kick the
 996          *    transfer here in that situation, otherwise we will be NAKing
 997          *    forever. If we get XferNotReady before gadget driver has a
 998          *    chance to queue a request, we will ACK the IRQ but won't be
 999          *    able to receive the data until the next request is queued.
1000          *    The following code is handling exactly that.
1001          *
1002          */
1003         if (dep->flags & DWC3_EP_PENDING_REQUEST) {
1004                 /*
1005                  * If xfernotready is already elapsed and it is a case
1006                  * of isoc transfer, then issue END TRANSFER, so that
1007                  * you can receive xfernotready again and can have
1008                  * notion of current microframe.
1009                  */
1010                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1011                         if (list_empty(&dep->req_queued)) {
1012                                 dwc3_stop_active_transfer(dwc, dep->number, true);
1013                                 dep->flags = DWC3_EP_ENABLED;
1014                         }
1015                         return 0;
1016                 }
1017
1018                 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1019                 if (ret && ret != -EBUSY)
1020                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1021                                         dep->name);
1022                 return ret;
1023         }
1024
1025         /*
1026          * 2. XferInProgress on Isoc EP with an active transfer. We need to
1027          *    kick the transfer here after queuing a request, otherwise the
1028          *    core may not see the modified TRB(s).
1029          */
1030         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1031                         (dep->flags & DWC3_EP_BUSY) &&
1032                         !(dep->flags & DWC3_EP_MISSED_ISOC)) {
1033                 WARN_ON_ONCE(!dep->resource_index);
1034                 ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index,
1035                                 false);
1036                 if (ret && ret != -EBUSY)
1037                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1038                                         dep->name);
1039                 return ret;
1040         }
1041
1042         /*
1043          * 4. Stream Capable Bulk Endpoints. We need to start the transfer
1044          * right away, otherwise host will not know we have streams to be
1045          * handled.
1046          */
1047         if (dep->stream_capable) {
1048                 int     ret;
1049
1050                 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1051                 if (ret && ret != -EBUSY) {
1052                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1053                                         dep->name);
1054                 }
1055         }
1056
1057         return 0;
1058 }
1059
1060 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1061         gfp_t gfp_flags)
1062 {
1063         struct dwc3_request             *req = to_dwc3_request(request);
1064         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1065
1066         unsigned long                   flags;
1067
1068         int                             ret;
1069
1070         spin_lock_irqsave(&dwc->lock, flags);
1071         if (!dep->endpoint.desc) {
1072                 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
1073                                 request, ep->name);
1074                 ret = -ESHUTDOWN;
1075                 goto out;
1076         }
1077
1078         if (req->dep != dep) {
1079                 WARN(true, "request %p belongs to '%s'\n",
1080                                 request, req->dep->name);
1081                 ret = -EINVAL;
1082                 goto out;
1083         }
1084
1085         dev_vdbg(dwc->dev, "queing request %p to %s length %d\n",
1086                         request, ep->name, request->length);
1087
1088         ret = __dwc3_gadget_ep_queue(dep, req);
1089
1090 out:
1091         spin_unlock_irqrestore(&dwc->lock, flags);
1092
1093         return ret;
1094 }
1095
1096 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1097                 struct usb_request *request)
1098 {
1099         struct dwc3_request             *req = to_dwc3_request(request);
1100         struct dwc3_request             *r = NULL;
1101
1102         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1103         struct dwc3                     *dwc = dep->dwc;
1104
1105         unsigned long                   flags;
1106         int                             ret = 0;
1107
1108         spin_lock_irqsave(&dwc->lock, flags);
1109
1110         list_for_each_entry(r, &dep->request_list, list) {
1111                 if (r == req)
1112                         break;
1113         }
1114
1115         if (r != req) {
1116                 list_for_each_entry(r, &dep->req_queued, list) {
1117                         if (r == req)
1118                                 break;
1119                 }
1120                 if (r == req) {
1121                         /* wait until it is processed */
1122                         dwc3_stop_active_transfer(dwc, dep->number, true);
1123                         goto out1;
1124                 }
1125                 dev_err(dwc->dev, "request %p was not queued to %s\n",
1126                                 request, ep->name);
1127                 ret = -EINVAL;
1128                 goto out0;
1129         }
1130
1131 out1:
1132         /* giveback the request */
1133         dwc3_gadget_giveback(dep, req, -ECONNRESET);
1134
1135 out0:
1136         spin_unlock_irqrestore(&dwc->lock, flags);
1137
1138         return ret;
1139 }
1140
1141 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
1142 {
1143         struct dwc3_gadget_ep_cmd_params        params;
1144         struct dwc3                             *dwc = dep->dwc;
1145         int                                     ret;
1146
1147         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1148                 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1149                 return -EINVAL;
1150         }
1151
1152         memset(&params, 0x00, sizeof(params));
1153
1154         if (value) {
1155                 if (!protocol && ((dep->direction && dep->flags & DWC3_EP_BUSY) ||
1156                                 (!list_empty(&dep->req_queued) ||
1157                                  !list_empty(&dep->request_list)))) {
1158                         dev_dbg(dwc->dev, "%s: pending request, cannot halt\n",
1159                                         dep->name);
1160                         return -EAGAIN;
1161                 }
1162
1163                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1164                         DWC3_DEPCMD_SETSTALL, &params);
1165                 if (ret)
1166                         dev_err(dwc->dev, "failed to set STALL on %s\n",
1167                                         dep->name);
1168                 else
1169                         dep->flags |= DWC3_EP_STALL;
1170         } else {
1171                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1172                         DWC3_DEPCMD_CLEARSTALL, &params);
1173                 if (ret)
1174                         dev_err(dwc->dev, "failed to clear STALL on %s\n",
1175                                         dep->name);
1176                 else
1177                         dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1178         }
1179
1180         return ret;
1181 }
1182
1183 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1184 {
1185         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1186
1187         unsigned long                   flags;
1188
1189         int                             ret;
1190
1191         spin_lock_irqsave(&dwc->lock, flags);
1192         ret = __dwc3_gadget_ep_set_halt(dep, value, false);
1193         spin_unlock_irqrestore(&dwc->lock, flags);
1194
1195         return ret;
1196 }
1197
1198 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1199 {
1200         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1201         unsigned long                   flags;
1202         int                             ret;
1203
1204         spin_lock_irqsave(&dwc->lock, flags);
1205         dep->flags |= DWC3_EP_WEDGE;
1206
1207         if (dep->number == 0 || dep->number == 1)
1208                 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
1209         else
1210                 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
1211         spin_unlock_irqrestore(&dwc->lock, flags);
1212
1213         return ret;
1214 }
1215
1216 /* -------------------------------------------------------------------------- */
1217
1218 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1219         .bLength        = USB_DT_ENDPOINT_SIZE,
1220         .bDescriptorType = USB_DT_ENDPOINT,
1221         .bmAttributes   = USB_ENDPOINT_XFER_CONTROL,
1222 };
1223
1224 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1225         .enable         = dwc3_gadget_ep0_enable,
1226         .disable        = dwc3_gadget_ep0_disable,
1227         .alloc_request  = dwc3_gadget_ep_alloc_request,
1228         .free_request   = dwc3_gadget_ep_free_request,
1229         .queue          = dwc3_gadget_ep0_queue,
1230         .dequeue        = dwc3_gadget_ep_dequeue,
1231         .set_halt       = dwc3_gadget_ep0_set_halt,
1232         .set_wedge      = dwc3_gadget_ep_set_wedge,
1233 };
1234
1235 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1236         .enable         = dwc3_gadget_ep_enable,
1237         .disable        = dwc3_gadget_ep_disable,
1238         .alloc_request  = dwc3_gadget_ep_alloc_request,
1239         .free_request   = dwc3_gadget_ep_free_request,
1240         .queue          = dwc3_gadget_ep_queue,
1241         .dequeue        = dwc3_gadget_ep_dequeue,
1242         .set_halt       = dwc3_gadget_ep_set_halt,
1243         .set_wedge      = dwc3_gadget_ep_set_wedge,
1244 };
1245
1246 /* -------------------------------------------------------------------------- */
1247
1248 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1249 {
1250         struct dwc3             *dwc = gadget_to_dwc(g);
1251         u32                     reg;
1252
1253         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1254         return DWC3_DSTS_SOFFN(reg);
1255 }
1256
1257 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1258 {
1259         struct dwc3             *dwc = gadget_to_dwc(g);
1260
1261         unsigned long           timeout;
1262         unsigned long           flags;
1263
1264         u32                     reg;
1265
1266         int                     ret = 0;
1267
1268         u8                      link_state;
1269         u8                      speed;
1270
1271         spin_lock_irqsave(&dwc->lock, flags);
1272
1273         /*
1274          * According to the Databook Remote wakeup request should
1275          * be issued only when the device is in early suspend state.
1276          *
1277          * We can check that via USB Link State bits in DSTS register.
1278          */
1279         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1280
1281         speed = reg & DWC3_DSTS_CONNECTSPD;
1282         if (speed == DWC3_DSTS_SUPERSPEED) {
1283                 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n");
1284                 ret = -EINVAL;
1285                 goto out;
1286         }
1287
1288         link_state = DWC3_DSTS_USBLNKST(reg);
1289
1290         switch (link_state) {
1291         case DWC3_LINK_STATE_RX_DET:    /* in HS, means Early Suspend */
1292         case DWC3_LINK_STATE_U3:        /* in HS, means SUSPEND */
1293                 break;
1294         default:
1295                 dev_dbg(dwc->dev, "can't wakeup from link state %d\n",
1296                                 link_state);
1297                 ret = -EINVAL;
1298                 goto out;
1299         }
1300
1301         ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1302         if (ret < 0) {
1303                 dev_err(dwc->dev, "failed to put link in Recovery\n");
1304                 goto out;
1305         }
1306
1307         /* Recent versions do this automatically */
1308         if (dwc->revision < DWC3_REVISION_194A) {
1309                 /* write zeroes to Link Change Request */
1310                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1311                 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1312                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1313         }
1314
1315         /* poll until Link State changes to ON */
1316         timeout = 1000;
1317
1318         while (timeout--) {
1319                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1320
1321                 /* in HS, means ON */
1322                 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1323                         break;
1324         }
1325
1326         if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1327                 dev_err(dwc->dev, "failed to send remote wakeup\n");
1328                 ret = -EINVAL;
1329         }
1330
1331 out:
1332         spin_unlock_irqrestore(&dwc->lock, flags);
1333
1334         return ret;
1335 }
1336
1337 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1338                 int is_selfpowered)
1339 {
1340         struct dwc3             *dwc = gadget_to_dwc(g);
1341         unsigned long           flags;
1342
1343         spin_lock_irqsave(&dwc->lock, flags);
1344         dwc->is_selfpowered = !!is_selfpowered;
1345         spin_unlock_irqrestore(&dwc->lock, flags);
1346
1347         return 0;
1348 }
1349
1350 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
1351 {
1352         u32                     reg;
1353         u32                     timeout = 500;
1354
1355         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1356         if (is_on) {
1357                 if (dwc->revision <= DWC3_REVISION_187A) {
1358                         reg &= ~DWC3_DCTL_TRGTULST_MASK;
1359                         reg |= DWC3_DCTL_TRGTULST_RX_DET;
1360                 }
1361
1362                 if (dwc->revision >= DWC3_REVISION_194A)
1363                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1364                 reg |= DWC3_DCTL_RUN_STOP;
1365
1366                 if (dwc->has_hibernation)
1367                         reg |= DWC3_DCTL_KEEP_CONNECT;
1368
1369                 dwc->pullups_connected = true;
1370         } else {
1371                 reg &= ~DWC3_DCTL_RUN_STOP;
1372
1373                 if (dwc->has_hibernation && !suspend)
1374                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1375
1376                 dwc->pullups_connected = false;
1377         }
1378
1379         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1380
1381         do {
1382                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1383                 if (is_on) {
1384                         if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1385                                 break;
1386                 } else {
1387                         if (reg & DWC3_DSTS_DEVCTRLHLT)
1388                                 break;
1389                 }
1390                 timeout--;
1391                 if (!timeout)
1392                         return -ETIMEDOUT;
1393                 udelay(1);
1394         } while (1);
1395
1396         dev_vdbg(dwc->dev, "gadget %s data soft-%s\n",
1397                         dwc->gadget_driver
1398                         ? dwc->gadget_driver->function : "no-function",
1399                         is_on ? "connect" : "disconnect");
1400
1401         return 0;
1402 }
1403
1404 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1405 {
1406         struct dwc3             *dwc = gadget_to_dwc(g);
1407         unsigned long           flags;
1408         int                     ret;
1409
1410         is_on = !!is_on;
1411
1412         spin_lock_irqsave(&dwc->lock, flags);
1413         ret = dwc3_gadget_run_stop(dwc, is_on, false);
1414         spin_unlock_irqrestore(&dwc->lock, flags);
1415
1416         return ret;
1417 }
1418
1419 static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1420 {
1421         u32                     reg;
1422
1423         /* Enable all but Start and End of Frame IRQs */
1424         reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1425                         DWC3_DEVTEN_EVNTOVERFLOWEN |
1426                         DWC3_DEVTEN_CMDCMPLTEN |
1427                         DWC3_DEVTEN_ERRTICERREN |
1428                         DWC3_DEVTEN_WKUPEVTEN |
1429                         DWC3_DEVTEN_ULSTCNGEN |
1430                         DWC3_DEVTEN_CONNECTDONEEN |
1431                         DWC3_DEVTEN_USBRSTEN |
1432                         DWC3_DEVTEN_DISCONNEVTEN);
1433
1434         dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1435 }
1436
1437 static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1438 {
1439         /* mask all interrupts */
1440         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1441 }
1442
1443 static int dwc3_gadget_start(struct usb_gadget *g,
1444                 struct usb_gadget_driver *driver)
1445 {
1446         struct dwc3             *dwc = gadget_to_dwc(g);
1447         struct dwc3_ep          *dep;
1448         unsigned long           flags;
1449         int                     ret = 0;
1450         u32                     reg;
1451
1452         spin_lock_irqsave(&dwc->lock, flags);
1453
1454         if (dwc->gadget_driver) {
1455                 dev_err(dwc->dev, "%s is already bound to %s\n",
1456                                 dwc->gadget.name,
1457                                 dwc->gadget_driver->function);
1458                 ret = -EBUSY;
1459                 goto err1;
1460         }
1461
1462         dwc->gadget_driver      = driver;
1463
1464         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1465         reg &= ~(DWC3_DCFG_SPEED_MASK);
1466
1467         /**
1468          * WORKAROUND: DWC3 revision < 2.20a have an issue
1469          * which would cause metastability state on Run/Stop
1470          * bit if we try to force the IP to USB2-only mode.
1471          *
1472          * Because of that, we cannot configure the IP to any
1473          * speed other than the SuperSpeed
1474          *
1475          * Refers to:
1476          *
1477          * STAR#9000525659: Clock Domain Crossing on DCTL in
1478          * USB 2.0 Mode
1479          */
1480         if (dwc->revision < DWC3_REVISION_220A) {
1481                 reg |= DWC3_DCFG_SUPERSPEED;
1482         } else {
1483                 switch (dwc->maximum_speed) {
1484                 case USB_SPEED_LOW:
1485                         reg |= DWC3_DSTS_LOWSPEED;
1486                         break;
1487                 case USB_SPEED_FULL:
1488                         reg |= DWC3_DSTS_FULLSPEED1;
1489                         break;
1490                 case USB_SPEED_HIGH:
1491                         reg |= DWC3_DSTS_HIGHSPEED;
1492                         break;
1493                 case USB_SPEED_SUPER:   /* FALLTHROUGH */
1494                 case USB_SPEED_UNKNOWN: /* FALTHROUGH */
1495                 default:
1496                         reg |= DWC3_DSTS_SUPERSPEED;
1497                 }
1498         }
1499         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1500
1501         dwc->start_config_issued = false;
1502
1503         /* Start with SuperSpeed Default */
1504         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1505
1506         dep = dwc->eps[0];
1507         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1508                         false);
1509         if (ret) {
1510                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1511                 goto err2;
1512         }
1513
1514         dep = dwc->eps[1];
1515         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1516                         false);
1517         if (ret) {
1518                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1519                 goto err3;
1520         }
1521
1522         /* begin to receive SETUP packets */
1523         dwc->ep0state = EP0_SETUP_PHASE;
1524         dwc3_ep0_out_start(dwc);
1525
1526         dwc3_gadget_enable_irq(dwc);
1527
1528         spin_unlock_irqrestore(&dwc->lock, flags);
1529
1530         return 0;
1531
1532 err3:
1533         __dwc3_gadget_ep_disable(dwc->eps[0]);
1534
1535 err2:
1536         dwc->gadget_driver = NULL;
1537
1538 err1:
1539         spin_unlock_irqrestore(&dwc->lock, flags);
1540
1541         return ret;
1542 }
1543
1544 static int dwc3_gadget_stop(struct usb_gadget *g)
1545 {
1546         struct dwc3             *dwc = gadget_to_dwc(g);
1547         unsigned long           flags;
1548
1549         spin_lock_irqsave(&dwc->lock, flags);
1550
1551         dwc3_gadget_disable_irq(dwc);
1552         __dwc3_gadget_ep_disable(dwc->eps[0]);
1553         __dwc3_gadget_ep_disable(dwc->eps[1]);
1554
1555         dwc->gadget_driver      = NULL;
1556
1557         spin_unlock_irqrestore(&dwc->lock, flags);
1558
1559         return 0;
1560 }
1561
1562 static const struct usb_gadget_ops dwc3_gadget_ops = {
1563         .get_frame              = dwc3_gadget_get_frame,
1564         .wakeup                 = dwc3_gadget_wakeup,
1565         .set_selfpowered        = dwc3_gadget_set_selfpowered,
1566         .pullup                 = dwc3_gadget_pullup,
1567         .udc_start              = dwc3_gadget_start,
1568         .udc_stop               = dwc3_gadget_stop,
1569 };
1570
1571 /* -------------------------------------------------------------------------- */
1572
1573 static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1574                 u8 num, u32 direction)
1575 {
1576         struct dwc3_ep                  *dep;
1577         u8                              i;
1578
1579         for (i = 0; i < num; i++) {
1580                 u8 epnum = (i << 1) | (!!direction);
1581
1582                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1583                 if (!dep)
1584                         return -ENOMEM;
1585
1586                 dep->dwc = dwc;
1587                 dep->number = epnum;
1588                 dep->direction = !!direction;
1589                 dwc->eps[epnum] = dep;
1590
1591                 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1592                                 (epnum & 1) ? "in" : "out");
1593
1594                 dep->endpoint.name = dep->name;
1595
1596                 dev_vdbg(dwc->dev, "initializing %s\n", dep->name);
1597
1598                 if (epnum == 0 || epnum == 1) {
1599                         usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
1600                         dep->endpoint.maxburst = 1;
1601                         dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1602                         if (!epnum)
1603                                 dwc->gadget.ep0 = &dep->endpoint;
1604                 } else {
1605                         int             ret;
1606
1607                         usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
1608                         dep->endpoint.max_streams = 15;
1609                         dep->endpoint.ops = &dwc3_gadget_ep_ops;
1610                         list_add_tail(&dep->endpoint.ep_list,
1611                                         &dwc->gadget.ep_list);
1612
1613                         ret = dwc3_alloc_trb_pool(dep);
1614                         if (ret)
1615                                 return ret;
1616                 }
1617
1618                 INIT_LIST_HEAD(&dep->request_list);
1619                 INIT_LIST_HEAD(&dep->req_queued);
1620         }
1621
1622         return 0;
1623 }
1624
1625 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1626 {
1627         int                             ret;
1628
1629         INIT_LIST_HEAD(&dwc->gadget.ep_list);
1630
1631         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1632         if (ret < 0) {
1633                 dev_vdbg(dwc->dev, "failed to allocate OUT endpoints\n");
1634                 return ret;
1635         }
1636
1637         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1638         if (ret < 0) {
1639                 dev_vdbg(dwc->dev, "failed to allocate IN endpoints\n");
1640                 return ret;
1641         }
1642
1643         return 0;
1644 }
1645
1646 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1647 {
1648         struct dwc3_ep                  *dep;
1649         u8                              epnum;
1650
1651         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1652                 dep = dwc->eps[epnum];
1653                 if (!dep)
1654                         continue;
1655                 /*
1656                  * Physical endpoints 0 and 1 are special; they form the
1657                  * bi-directional USB endpoint 0.
1658                  *
1659                  * For those two physical endpoints, we don't allocate a TRB
1660                  * pool nor do we add them the endpoints list. Due to that, we
1661                  * shouldn't do these two operations otherwise we would end up
1662                  * with all sorts of bugs when removing dwc3.ko.
1663                  */
1664                 if (epnum != 0 && epnum != 1) {
1665                         dwc3_free_trb_pool(dep);
1666                         list_del(&dep->endpoint.ep_list);
1667                 }
1668
1669                 kfree(dep);
1670         }
1671 }
1672
1673 /* -------------------------------------------------------------------------- */
1674
1675 static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
1676                 struct dwc3_request *req, struct dwc3_trb *trb,
1677                 const struct dwc3_event_depevt *event, int status)
1678 {
1679         unsigned int            count;
1680         unsigned int            s_pkt = 0;
1681         unsigned int            trb_status;
1682
1683         if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
1684                 /*
1685                  * We continue despite the error. There is not much we
1686                  * can do. If we don't clean it up we loop forever. If
1687                  * we skip the TRB then it gets overwritten after a
1688                  * while since we use them in a ring buffer. A BUG()
1689                  * would help. Lets hope that if this occurs, someone
1690                  * fixes the root cause instead of looking away :)
1691                  */
1692                 dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1693                                 dep->name, trb);
1694         count = trb->size & DWC3_TRB_SIZE_MASK;
1695
1696         if (dep->direction) {
1697                 if (count) {
1698                         trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
1699                         if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
1700                                 dev_dbg(dwc->dev, "incomplete IN transfer %s\n",
1701                                                 dep->name);
1702                                 /*
1703                                  * If missed isoc occurred and there is
1704                                  * no request queued then issue END
1705                                  * TRANSFER, so that core generates
1706                                  * next xfernotready and we will issue
1707                                  * a fresh START TRANSFER.
1708                                  * If there are still queued request
1709                                  * then wait, do not issue either END
1710                                  * or UPDATE TRANSFER, just attach next
1711                                  * request in request_list during
1712                                  * giveback.If any future queued request
1713                                  * is successfully transferred then we
1714                                  * will issue UPDATE TRANSFER for all
1715                                  * request in the request_list.
1716                                  */
1717                                 dep->flags |= DWC3_EP_MISSED_ISOC;
1718                         } else {
1719                                 dev_err(dwc->dev, "incomplete IN transfer %s\n",
1720                                                 dep->name);
1721                                 status = -ECONNRESET;
1722                         }
1723                 } else {
1724                         dep->flags &= ~DWC3_EP_MISSED_ISOC;
1725                 }
1726         } else {
1727                 if (count && (event->status & DEPEVT_STATUS_SHORT))
1728                         s_pkt = 1;
1729         }
1730
1731         /*
1732          * We assume here we will always receive the entire data block
1733          * which we should receive. Meaning, if we program RX to
1734          * receive 4K but we receive only 2K, we assume that's all we
1735          * should receive and we simply bounce the request back to the
1736          * gadget driver for further processing.
1737          */
1738         req->request.actual += req->request.length - count;
1739         if (s_pkt)
1740                 return 1;
1741         if ((event->status & DEPEVT_STATUS_LST) &&
1742                         (trb->ctrl & (DWC3_TRB_CTRL_LST |
1743                                 DWC3_TRB_CTRL_HWO)))
1744                 return 1;
1745         if ((event->status & DEPEVT_STATUS_IOC) &&
1746                         (trb->ctrl & DWC3_TRB_CTRL_IOC))
1747                 return 1;
1748         return 0;
1749 }
1750
1751 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1752                 const struct dwc3_event_depevt *event, int status)
1753 {
1754         struct dwc3_request     *req;
1755         struct dwc3_trb         *trb;
1756         unsigned int            slot;
1757
1758         req = next_request(&dep->req_queued);
1759         if (!req) {
1760                 WARN_ON_ONCE(1);
1761                 return 1;
1762         }
1763
1764         slot = req->start_slot;
1765         if ((slot == DWC3_TRB_NUM - 1) &&
1766             usb_endpoint_xfer_isoc(dep->endpoint.desc))
1767                 slot++;
1768         slot %= DWC3_TRB_NUM;
1769         trb = &dep->trb_pool[slot];
1770
1771         dwc3_flush_cache((uintptr_t)trb, sizeof(*trb));
1772         __dwc3_cleanup_done_trbs(dwc, dep, req, trb, event, status);
1773         dwc3_gadget_giveback(dep, req, status);
1774
1775         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1776                         list_empty(&dep->req_queued)) {
1777                 if (list_empty(&dep->request_list)) {
1778                         /*
1779                          * If there is no entry in request list then do
1780                          * not issue END TRANSFER now. Just set PENDING
1781                          * flag, so that END TRANSFER is issued when an
1782                          * entry is added into request list.
1783                          */
1784                         dep->flags = DWC3_EP_PENDING_REQUEST;
1785                 } else {
1786                         dwc3_stop_active_transfer(dwc, dep->number, true);
1787                         dep->flags = DWC3_EP_ENABLED;
1788                 }
1789                 return 1;
1790         }
1791
1792         return 1;
1793 }
1794
1795 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
1796                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1797 {
1798         unsigned                status = 0;
1799         int                     clean_busy;
1800
1801         if (event->status & DEPEVT_STATUS_BUSERR)
1802                 status = -ECONNRESET;
1803
1804         clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
1805         if (clean_busy)
1806                 dep->flags &= ~DWC3_EP_BUSY;
1807
1808         /*
1809          * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
1810          * See dwc3_gadget_linksts_change_interrupt() for 1st half.
1811          */
1812         if (dwc->revision < DWC3_REVISION_183A) {
1813                 u32             reg;
1814                 int             i;
1815
1816                 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
1817                         dep = dwc->eps[i];
1818
1819                         if (!(dep->flags & DWC3_EP_ENABLED))
1820                                 continue;
1821
1822                         if (!list_empty(&dep->req_queued))
1823                                 return;
1824                 }
1825
1826                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1827                 reg |= dwc->u1u2;
1828                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1829
1830                 dwc->u1u2 = 0;
1831         }
1832 }
1833
1834 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
1835                 const struct dwc3_event_depevt *event)
1836 {
1837         struct dwc3_ep          *dep;
1838         u8                      epnum = event->endpoint_number;
1839
1840         dep = dwc->eps[epnum];
1841
1842         if (!(dep->flags & DWC3_EP_ENABLED))
1843                 return;
1844
1845         if (epnum == 0 || epnum == 1) {
1846                 dwc3_ep0_interrupt(dwc, event);
1847                 return;
1848         }
1849
1850         switch (event->endpoint_event) {
1851         case DWC3_DEPEVT_XFERCOMPLETE:
1852                 dep->resource_index = 0;
1853
1854                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1855                         dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n",
1856                                         dep->name);
1857                         return;
1858                 }
1859
1860                 dwc3_endpoint_transfer_complete(dwc, dep, event);
1861                 break;
1862         case DWC3_DEPEVT_XFERINPROGRESS:
1863                 dwc3_endpoint_transfer_complete(dwc, dep, event);
1864                 break;
1865         case DWC3_DEPEVT_XFERNOTREADY:
1866                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1867                         dwc3_gadget_start_isoc(dwc, dep, event);
1868                 } else {
1869                         int ret;
1870
1871                         dev_vdbg(dwc->dev, "%s: reason %s\n",
1872                                         dep->name, event->status &
1873                                         DEPEVT_STATUS_TRANSFER_ACTIVE
1874                                         ? "Transfer Active"
1875                                         : "Transfer Not Active");
1876
1877                         ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
1878                         if (!ret || ret == -EBUSY)
1879                                 return;
1880
1881                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1882                                         dep->name);
1883                 }
1884
1885                 break;
1886         case DWC3_DEPEVT_STREAMEVT:
1887                 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
1888                         dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
1889                                         dep->name);
1890                         return;
1891                 }
1892
1893                 switch (event->status) {
1894                 case DEPEVT_STREAMEVT_FOUND:
1895                         dev_vdbg(dwc->dev, "Stream %d found and started\n",
1896                                         event->parameters);
1897
1898                         break;
1899                 case DEPEVT_STREAMEVT_NOTFOUND:
1900                         /* FALLTHROUGH */
1901                 default:
1902                         dev_dbg(dwc->dev, "Couldn't find suitable stream\n");
1903                 }
1904                 break;
1905         case DWC3_DEPEVT_RXTXFIFOEVT:
1906                 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name);
1907                 break;
1908         case DWC3_DEPEVT_EPCMDCMPLT:
1909                 dev_vdbg(dwc->dev, "Endpoint Command Complete\n");
1910                 break;
1911         }
1912 }
1913
1914 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
1915 {
1916         if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
1917                 spin_unlock(&dwc->lock);
1918                 dwc->gadget_driver->disconnect(&dwc->gadget);
1919                 spin_lock(&dwc->lock);
1920         }
1921 }
1922
1923 static void dwc3_suspend_gadget(struct dwc3 *dwc)
1924 {
1925         if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
1926                 spin_unlock(&dwc->lock);
1927                 dwc->gadget_driver->suspend(&dwc->gadget);
1928                 spin_lock(&dwc->lock);
1929         }
1930 }
1931
1932 static void dwc3_resume_gadget(struct dwc3 *dwc)
1933 {
1934         if (dwc->gadget_driver && dwc->gadget_driver->resume) {
1935                 spin_unlock(&dwc->lock);
1936                 dwc->gadget_driver->resume(&dwc->gadget);
1937         }
1938 }
1939
1940 static void dwc3_reset_gadget(struct dwc3 *dwc)
1941 {
1942         if (!dwc->gadget_driver)
1943                 return;
1944
1945         if (dwc->gadget.speed != USB_SPEED_UNKNOWN) {
1946                 spin_unlock(&dwc->lock);
1947                 usb_gadget_udc_reset(&dwc->gadget, dwc->gadget_driver);
1948                 spin_lock(&dwc->lock);
1949         }
1950 }
1951
1952 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force)
1953 {
1954         struct dwc3_ep *dep;
1955         struct dwc3_gadget_ep_cmd_params params;
1956         u32 cmd;
1957         int ret;
1958
1959         dep = dwc->eps[epnum];
1960
1961         if (!dep->resource_index)
1962                 return;
1963
1964         /*
1965          * NOTICE: We are violating what the Databook says about the
1966          * EndTransfer command. Ideally we would _always_ wait for the
1967          * EndTransfer Command Completion IRQ, but that's causing too
1968          * much trouble synchronizing between us and gadget driver.
1969          *
1970          * We have discussed this with the IP Provider and it was
1971          * suggested to giveback all requests here, but give HW some
1972          * extra time to synchronize with the interconnect. We're using
1973          * an arbitraty 100us delay for that.
1974          *
1975          * Note also that a similar handling was tested by Synopsys
1976          * (thanks a lot Paul) and nothing bad has come out of it.
1977          * In short, what we're doing is:
1978          *
1979          * - Issue EndTransfer WITH CMDIOC bit set
1980          * - Wait 100us
1981          */
1982
1983         cmd = DWC3_DEPCMD_ENDTRANSFER;
1984         cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
1985         cmd |= DWC3_DEPCMD_CMDIOC;
1986         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1987         memset(&params, 0, sizeof(params));
1988         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
1989         WARN_ON_ONCE(ret);
1990         dep->resource_index = 0;
1991         dep->flags &= ~DWC3_EP_BUSY;
1992         udelay(100);
1993 }
1994
1995 static void dwc3_stop_active_transfers(struct dwc3 *dwc)
1996 {
1997         u32 epnum;
1998
1999         for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2000                 struct dwc3_ep *dep;
2001
2002                 dep = dwc->eps[epnum];
2003                 if (!dep)
2004                         continue;
2005
2006                 if (!(dep->flags & DWC3_EP_ENABLED))
2007                         continue;
2008
2009                 dwc3_remove_requests(dwc, dep);
2010         }
2011 }
2012
2013 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2014 {
2015         u32 epnum;
2016
2017         for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2018                 struct dwc3_ep *dep;
2019                 struct dwc3_gadget_ep_cmd_params params;
2020                 int ret;
2021
2022                 dep = dwc->eps[epnum];
2023                 if (!dep)
2024                         continue;
2025
2026                 if (!(dep->flags & DWC3_EP_STALL))
2027                         continue;
2028
2029                 dep->flags &= ~DWC3_EP_STALL;
2030
2031                 memset(&params, 0, sizeof(params));
2032                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
2033                                 DWC3_DEPCMD_CLEARSTALL, &params);
2034                 WARN_ON_ONCE(ret);
2035         }
2036 }
2037
2038 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2039 {
2040         int                     reg;
2041
2042         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2043         reg &= ~DWC3_DCTL_INITU1ENA;
2044         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2045
2046         reg &= ~DWC3_DCTL_INITU2ENA;
2047         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2048
2049         dwc3_disconnect_gadget(dwc);
2050         dwc->start_config_issued = false;
2051
2052         dwc->gadget.speed = USB_SPEED_UNKNOWN;
2053         dwc->setup_packet_pending = false;
2054         usb_gadget_set_state(&dwc->gadget, USB_STATE_NOTATTACHED);
2055 }
2056
2057 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2058 {
2059         u32                     reg;
2060
2061         /*
2062          * WORKAROUND: DWC3 revisions <1.88a have an issue which
2063          * would cause a missing Disconnect Event if there's a
2064          * pending Setup Packet in the FIFO.
2065          *
2066          * There's no suggested workaround on the official Bug
2067          * report, which states that "unless the driver/application
2068          * is doing any special handling of a disconnect event,
2069          * there is no functional issue".
2070          *
2071          * Unfortunately, it turns out that we _do_ some special
2072          * handling of a disconnect event, namely complete all
2073          * pending transfers, notify gadget driver of the
2074          * disconnection, and so on.
2075          *
2076          * Our suggested workaround is to follow the Disconnect
2077          * Event steps here, instead, based on a setup_packet_pending
2078          * flag. Such flag gets set whenever we have a XferNotReady
2079          * event on EP0 and gets cleared on XferComplete for the
2080          * same endpoint.
2081          *
2082          * Refers to:
2083          *
2084          * STAR#9000466709: RTL: Device : Disconnect event not
2085          * generated if setup packet pending in FIFO
2086          */
2087         if (dwc->revision < DWC3_REVISION_188A) {
2088                 if (dwc->setup_packet_pending)
2089                         dwc3_gadget_disconnect_interrupt(dwc);
2090         }
2091
2092         dwc3_reset_gadget(dwc);
2093
2094         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2095         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2096         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2097         dwc->test_mode = false;
2098
2099         dwc3_stop_active_transfers(dwc);
2100         dwc3_clear_stall_all_ep(dwc);
2101         dwc->start_config_issued = false;
2102
2103         /* Reset device address to zero */
2104         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2105         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2106         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2107 }
2108
2109 static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
2110 {
2111         u32 reg;
2112         u32 usb30_clock = DWC3_GCTL_CLK_BUS;
2113
2114         /*
2115          * We change the clock only at SS but I dunno why I would want to do
2116          * this. Maybe it becomes part of the power saving plan.
2117          */
2118
2119         if (speed != DWC3_DSTS_SUPERSPEED)
2120                 return;
2121
2122         /*
2123          * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2124          * each time on Connect Done.
2125          */
2126         if (!usb30_clock)
2127                 return;
2128
2129         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
2130         reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
2131         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
2132 }
2133
2134 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2135 {
2136         struct dwc3_ep          *dep;
2137         int                     ret;
2138         u32                     reg;
2139         u8                      speed;
2140
2141         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2142         speed = reg & DWC3_DSTS_CONNECTSPD;
2143         dwc->speed = speed;
2144
2145         dwc3_update_ram_clk_sel(dwc, speed);
2146
2147         switch (speed) {
2148         case DWC3_DCFG_SUPERSPEED:
2149                 /*
2150                  * WORKAROUND: DWC3 revisions <1.90a have an issue which
2151                  * would cause a missing USB3 Reset event.
2152                  *
2153                  * In such situations, we should force a USB3 Reset
2154                  * event by calling our dwc3_gadget_reset_interrupt()
2155                  * routine.
2156                  *
2157                  * Refers to:
2158                  *
2159                  * STAR#9000483510: RTL: SS : USB3 reset event may
2160                  * not be generated always when the link enters poll
2161                  */
2162                 if (dwc->revision < DWC3_REVISION_190A)
2163                         dwc3_gadget_reset_interrupt(dwc);
2164
2165                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2166                 dwc->gadget.ep0->maxpacket = 512;
2167                 dwc->gadget.speed = USB_SPEED_SUPER;
2168                 break;
2169         case DWC3_DCFG_HIGHSPEED:
2170                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2171                 dwc->gadget.ep0->maxpacket = 64;
2172                 dwc->gadget.speed = USB_SPEED_HIGH;
2173                 break;
2174         case DWC3_DCFG_FULLSPEED2:
2175         case DWC3_DCFG_FULLSPEED1:
2176                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2177                 dwc->gadget.ep0->maxpacket = 64;
2178                 dwc->gadget.speed = USB_SPEED_FULL;
2179                 break;
2180         case DWC3_DCFG_LOWSPEED:
2181                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2182                 dwc->gadget.ep0->maxpacket = 8;
2183                 dwc->gadget.speed = USB_SPEED_LOW;
2184                 break;
2185         }
2186
2187         /* Enable USB2 LPM Capability */
2188
2189         if ((dwc->revision > DWC3_REVISION_194A)
2190                         && (speed != DWC3_DCFG_SUPERSPEED)) {
2191                 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2192                 reg |= DWC3_DCFG_LPM_CAP;
2193                 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2194
2195                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2196                 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2197
2198                 reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold);
2199
2200                 /*
2201                  * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
2202                  * DCFG.LPMCap is set, core responses with an ACK and the
2203                  * BESL value in the LPM token is less than or equal to LPM
2204                  * NYET threshold.
2205                  */
2206                 if (dwc->revision < DWC3_REVISION_240A  && dwc->has_lpm_erratum)
2207                         WARN(true, "LPM Erratum not available on dwc3 revisisions < 2.40a\n");
2208
2209                 if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A)
2210                         reg |= DWC3_DCTL_LPM_ERRATA(dwc->lpm_nyet_threshold);
2211
2212                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2213         } else {
2214                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2215                 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
2216                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2217         }
2218
2219         dep = dwc->eps[0];
2220         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2221                         false);
2222         if (ret) {
2223                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2224                 return;
2225         }
2226
2227         dep = dwc->eps[1];
2228         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2229                         false);
2230         if (ret) {
2231                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2232                 return;
2233         }
2234
2235         /*
2236          * Configure PHY via GUSB3PIPECTLn if required.
2237          *
2238          * Update GTXFIFOSIZn
2239          *
2240          * In both cases reset values should be sufficient.
2241          */
2242 }
2243
2244 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2245 {
2246         /*
2247          * TODO take core out of low power mode when that's
2248          * implemented.
2249          */
2250
2251         dwc->gadget_driver->resume(&dwc->gadget);
2252 }
2253
2254 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2255                 unsigned int evtinfo)
2256 {
2257         enum dwc3_link_state    next = evtinfo & DWC3_LINK_STATE_MASK;
2258         unsigned int            pwropt;
2259
2260         /*
2261          * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2262          * Hibernation mode enabled which would show up when device detects
2263          * host-initiated U3 exit.
2264          *
2265          * In that case, device will generate a Link State Change Interrupt
2266          * from U3 to RESUME which is only necessary if Hibernation is
2267          * configured in.
2268          *
2269          * There are no functional changes due to such spurious event and we
2270          * just need to ignore it.
2271          *
2272          * Refers to:
2273          *
2274          * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2275          * operational mode
2276          */
2277         pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
2278         if ((dwc->revision < DWC3_REVISION_250A) &&
2279                         (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
2280                 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
2281                                 (next == DWC3_LINK_STATE_RESUME)) {
2282                         dev_vdbg(dwc->dev, "ignoring transition U3 -> Resume\n");
2283                         return;
2284                 }
2285         }
2286
2287         /*
2288          * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2289          * on the link partner, the USB session might do multiple entry/exit
2290          * of low power states before a transfer takes place.
2291          *
2292          * Due to this problem, we might experience lower throughput. The
2293          * suggested workaround is to disable DCTL[12:9] bits if we're
2294          * transitioning from U1/U2 to U0 and enable those bits again
2295          * after a transfer completes and there are no pending transfers
2296          * on any of the enabled endpoints.
2297          *
2298          * This is the first half of that workaround.
2299          *
2300          * Refers to:
2301          *
2302          * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2303          * core send LGO_Ux entering U0
2304          */
2305         if (dwc->revision < DWC3_REVISION_183A) {
2306                 if (next == DWC3_LINK_STATE_U0) {
2307                         u32     u1u2;
2308                         u32     reg;
2309
2310                         switch (dwc->link_state) {
2311                         case DWC3_LINK_STATE_U1:
2312                         case DWC3_LINK_STATE_U2:
2313                                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2314                                 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2315                                                 | DWC3_DCTL_ACCEPTU2ENA
2316                                                 | DWC3_DCTL_INITU1ENA
2317                                                 | DWC3_DCTL_ACCEPTU1ENA);
2318
2319                                 if (!dwc->u1u2)
2320                                         dwc->u1u2 = reg & u1u2;
2321
2322                                 reg &= ~u1u2;
2323
2324                                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2325                                 break;
2326                         default:
2327                                 /* do nothing */
2328                                 break;
2329                         }
2330                 }
2331         }
2332
2333         switch (next) {
2334         case DWC3_LINK_STATE_U1:
2335                 if (dwc->speed == USB_SPEED_SUPER)
2336                         dwc3_suspend_gadget(dwc);
2337                 break;
2338         case DWC3_LINK_STATE_U2:
2339         case DWC3_LINK_STATE_U3:
2340                 dwc3_suspend_gadget(dwc);
2341                 break;
2342         case DWC3_LINK_STATE_RESUME:
2343                 dwc3_resume_gadget(dwc);
2344                 break;
2345         default:
2346                 /* do nothing */
2347                 break;
2348         }
2349
2350         dwc->link_state = next;
2351 }
2352
2353 static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
2354                 unsigned int evtinfo)
2355 {
2356         unsigned int is_ss = evtinfo & (1UL << 4);
2357
2358         /**
2359          * WORKAROUND: DWC3 revison 2.20a with hibernation support
2360          * have a known issue which can cause USB CV TD.9.23 to fail
2361          * randomly.
2362          *
2363          * Because of this issue, core could generate bogus hibernation
2364          * events which SW needs to ignore.
2365          *
2366          * Refers to:
2367          *
2368          * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
2369          * Device Fallback from SuperSpeed
2370          */
2371         if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
2372                 return;
2373
2374         /* enter hibernation here */
2375 }
2376
2377 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2378                 const struct dwc3_event_devt *event)
2379 {
2380         switch (event->type) {
2381         case DWC3_DEVICE_EVENT_DISCONNECT:
2382                 dwc3_gadget_disconnect_interrupt(dwc);
2383                 break;
2384         case DWC3_DEVICE_EVENT_RESET:
2385                 dwc3_gadget_reset_interrupt(dwc);
2386                 break;
2387         case DWC3_DEVICE_EVENT_CONNECT_DONE:
2388                 dwc3_gadget_conndone_interrupt(dwc);
2389                 break;
2390         case DWC3_DEVICE_EVENT_WAKEUP:
2391                 dwc3_gadget_wakeup_interrupt(dwc);
2392                 break;
2393         case DWC3_DEVICE_EVENT_HIBER_REQ:
2394                 if (!dwc->has_hibernation) {
2395                         WARN(1 ,"unexpected hibernation event\n");
2396                         break;
2397                 }
2398                 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
2399                 break;
2400         case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2401                 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2402                 break;
2403         case DWC3_DEVICE_EVENT_EOPF:
2404                 dev_vdbg(dwc->dev, "End of Periodic Frame\n");
2405                 break;
2406         case DWC3_DEVICE_EVENT_SOF:
2407                 dev_vdbg(dwc->dev, "Start of Periodic Frame\n");
2408                 break;
2409         case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2410                 dev_vdbg(dwc->dev, "Erratic Error\n");
2411                 break;
2412         case DWC3_DEVICE_EVENT_CMD_CMPL:
2413                 dev_vdbg(dwc->dev, "Command Complete\n");
2414                 break;
2415         case DWC3_DEVICE_EVENT_OVERFLOW:
2416                 dev_vdbg(dwc->dev, "Overflow\n");
2417                 break;
2418         default:
2419                 dev_dbg(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2420         }
2421 }
2422
2423 static void dwc3_process_event_entry(struct dwc3 *dwc,
2424                 const union dwc3_event *event)
2425 {
2426         /* Endpoint IRQ, handle it and return early */
2427         if (event->type.is_devspec == 0) {
2428                 /* depevt */
2429                 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2430         }
2431
2432         switch (event->type.type) {
2433         case DWC3_EVENT_TYPE_DEV:
2434                 dwc3_gadget_interrupt(dwc, &event->devt);
2435                 break;
2436         /* REVISIT what to do with Carkit and I2C events ? */
2437         default:
2438                 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2439         }
2440 }
2441
2442 static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
2443 {
2444         struct dwc3_event_buffer *evt;
2445         irqreturn_t ret = IRQ_NONE;
2446         int left;
2447         u32 reg;
2448
2449         evt = dwc->ev_buffs[buf];
2450         left = evt->count;
2451
2452         if (!(evt->flags & DWC3_EVENT_PENDING))
2453                 return IRQ_NONE;
2454
2455         while (left > 0) {
2456                 union dwc3_event event;
2457
2458                 event.raw = *(u32 *) (evt->buf + evt->lpos);
2459
2460                 dwc3_process_event_entry(dwc, &event);
2461
2462                 /*
2463                  * FIXME we wrap around correctly to the next entry as
2464                  * almost all entries are 4 bytes in size. There is one
2465                  * entry which has 12 bytes which is a regular entry
2466                  * followed by 8 bytes data. ATM I don't know how
2467                  * things are organized if we get next to the a
2468                  * boundary so I worry about that once we try to handle
2469                  * that.
2470                  */
2471                 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
2472                 left -= 4;
2473
2474                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4);
2475         }
2476
2477         evt->count = 0;
2478         evt->flags &= ~DWC3_EVENT_PENDING;
2479         ret = IRQ_HANDLED;
2480
2481         /* Unmask interrupt */
2482         reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2483         reg &= ~DWC3_GEVNTSIZ_INTMASK;
2484         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2485
2486         return ret;
2487 }
2488
2489 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
2490 {
2491         struct dwc3 *dwc = _dwc;
2492         unsigned long flags;
2493         irqreturn_t ret = IRQ_NONE;
2494         int i;
2495
2496         spin_lock_irqsave(&dwc->lock, flags);
2497
2498         for (i = 0; i < dwc->num_event_buffers; i++)
2499                 ret |= dwc3_process_event_buf(dwc, i);
2500
2501         spin_unlock_irqrestore(&dwc->lock, flags);
2502
2503         return ret;
2504 }
2505
2506 static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc, u32 buf)
2507 {
2508         struct dwc3_event_buffer *evt;
2509         u32 count;
2510         u32 reg;
2511
2512         evt = dwc->ev_buffs[buf];
2513
2514         count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
2515         count &= DWC3_GEVNTCOUNT_MASK;
2516         if (!count)
2517                 return IRQ_NONE;
2518
2519         evt->count = count;
2520         evt->flags |= DWC3_EVENT_PENDING;
2521
2522         /* Mask interrupt */
2523         reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2524         reg |= DWC3_GEVNTSIZ_INTMASK;
2525         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2526
2527         return IRQ_WAKE_THREAD;
2528 }
2529
2530 static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
2531 {
2532         struct dwc3                     *dwc = _dwc;
2533         int                             i;
2534         irqreturn_t                     ret = IRQ_NONE;
2535
2536         spin_lock(&dwc->lock);
2537
2538         for (i = 0; i < dwc->num_event_buffers; i++) {
2539                 irqreturn_t status;
2540
2541                 status = dwc3_check_event_buf(dwc, i);
2542                 if (status == IRQ_WAKE_THREAD)
2543                         ret = status;
2544         }
2545
2546         spin_unlock(&dwc->lock);
2547
2548         return ret;
2549 }
2550
2551 /**
2552  * dwc3_gadget_init - Initializes gadget related registers
2553  * @dwc: pointer to our controller context structure
2554  *
2555  * Returns 0 on success otherwise negative errno.
2556  */
2557 int dwc3_gadget_init(struct dwc3 *dwc)
2558 {
2559         int                                     ret;
2560
2561         dwc->ctrl_req = dma_alloc_coherent(sizeof(*dwc->ctrl_req),
2562                                         (unsigned long *)&dwc->ctrl_req_addr);
2563         if (!dwc->ctrl_req) {
2564                 dev_err(dwc->dev, "failed to allocate ctrl request\n");
2565                 ret = -ENOMEM;
2566                 goto err0;
2567         }
2568
2569         dwc->ep0_trb = dma_alloc_coherent(sizeof(*dwc->ep0_trb) * 2,
2570                                           (unsigned long *)&dwc->ep0_trb_addr);
2571         if (!dwc->ep0_trb) {
2572                 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
2573                 ret = -ENOMEM;
2574                 goto err1;
2575         }
2576
2577         dwc->setup_buf = memalign(CONFIG_SYS_CACHELINE_SIZE,
2578                                   DWC3_EP0_BOUNCE_SIZE);
2579         if (!dwc->setup_buf) {
2580                 ret = -ENOMEM;
2581                 goto err2;
2582         }
2583
2584         dwc->ep0_bounce = dma_alloc_coherent(DWC3_EP0_BOUNCE_SIZE,
2585                                         (unsigned long *)&dwc->ep0_bounce_addr);
2586         if (!dwc->ep0_bounce) {
2587                 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
2588                 ret = -ENOMEM;
2589                 goto err3;
2590         }
2591
2592         dwc->gadget.ops                 = &dwc3_gadget_ops;
2593         dwc->gadget.max_speed           = USB_SPEED_SUPER;
2594         dwc->gadget.speed               = USB_SPEED_UNKNOWN;
2595         dwc->gadget.name                = "dwc3-gadget";
2596
2597         /*
2598          * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
2599          * on ep out.
2600          */
2601         dwc->gadget.quirk_ep_out_aligned_size = true;
2602
2603         /*
2604          * REVISIT: Here we should clear all pending IRQs to be
2605          * sure we're starting from a well known location.
2606          */
2607
2608         ret = dwc3_gadget_init_endpoints(dwc);
2609         if (ret)
2610                 goto err4;
2611
2612         ret = usb_add_gadget_udc((struct device *)dwc->dev, &dwc->gadget);
2613         if (ret) {
2614                 dev_err(dwc->dev, "failed to register udc\n");
2615                 goto err4;
2616         }
2617
2618         return 0;
2619
2620 err4:
2621         dwc3_gadget_free_endpoints(dwc);
2622         dma_free_coherent(dwc->ep0_bounce);
2623
2624 err3:
2625         kfree(dwc->setup_buf);
2626
2627 err2:
2628         dma_free_coherent(dwc->ep0_trb);
2629
2630 err1:
2631         dma_free_coherent(dwc->ctrl_req);
2632
2633 err0:
2634         return ret;
2635 }
2636
2637 /* -------------------------------------------------------------------------- */
2638
2639 void dwc3_gadget_exit(struct dwc3 *dwc)
2640 {
2641         usb_del_gadget_udc(&dwc->gadget);
2642
2643         dwc3_gadget_free_endpoints(dwc);
2644
2645         dma_free_coherent(dwc->ep0_bounce);
2646
2647         kfree(dwc->setup_buf);
2648
2649         dma_free_coherent(dwc->ep0_trb);
2650
2651         dma_free_coherent(dwc->ctrl_req);
2652 }
2653
2654 /**
2655  * dwc3_gadget_uboot_handle_interrupt - handle dwc3 gadget interrupt
2656  * @dwc: struct dwce *
2657  *
2658  * Handles ep0 and gadget interrupt
2659  *
2660  * Should be called from dwc3 core.
2661  */
2662 void dwc3_gadget_uboot_handle_interrupt(struct dwc3 *dwc)
2663 {
2664         int ret = dwc3_interrupt(0, dwc);
2665
2666         if (ret == IRQ_WAKE_THREAD) {
2667                 int i;
2668                 struct dwc3_event_buffer *evt;
2669
2670                 dwc3_thread_interrupt(0, dwc);
2671
2672                 /* Clean + Invalidate the buffers after touching them */
2673                 for (i = 0; i < dwc->num_event_buffers; i++) {
2674                         evt = dwc->ev_buffs[i];
2675                         dwc3_flush_cache((uintptr_t)evt->buf, evt->length);
2676                 }
2677         }
2678 }