drivers/usb/dwc3/gadget.c

   1 /**
   2  * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
   3  *
   4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Authors: Felipe Balbi <balbi@ti.com>,
   7  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2  of
  11  * the License as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/delay.h>
  21 #include <linux/slab.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27 #include <linux/list.h>
  28 #include <linux/dma-mapping.h>
  29
  30 #include <linux/usb/ch9.h>
  31 #include <linux/usb/gadget.h>
  32
  33 #include "core.h"
  34 #include "gadget.h"
  35 #include "io.h"
  36
  37 /**
  38  * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
  39  * @dwc: pointer to our context structure
  40  * @mode: the mode to set (J, K SE0 NAK, Force Enable)
  41  *
  42  * Caller should take care of locking. This function will
  43  * return 0 on success or -EINVAL if wrong Test Selector
  44  * is passed
  45  */
  46 int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
  47 {
  48         u32             reg;
  49
  50         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
  51         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
  52
  53         switch (mode) {
  54         case TEST_J:
  55         case TEST_K:
  56         case TEST_SE0_NAK:
  57         case TEST_PACKET:
  58         case TEST_FORCE_EN:
  59                 reg |= mode << 1;
  60                 break;
  61         default:
  62                 return -EINVAL;
  63         }
  64
  65         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
  66
  67         return 0;
  68 }
  69
  70 /**
  71  * dwc3_gadget_set_link_state - Sets USB Link to a particular State
  72  * @dwc: pointer to our context structure
  73  * @state: the state to put link into
  74  *
  75  * Caller should take care of locking. This function will
  76  * return 0 on success or -ETIMEDOUT.
  77  */
  78 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
  79 {
  80         int             retries = 10000;
  81         u32             reg;
  82
  83         /*
  84          * Wait until device controller is ready. Only applies to 1.94a and
  85          * later RTL.
  86          */
  87         if (dwc->revision >= DWC3_REVISION_194A) {
  88                 while (--retries) {
  89                         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
  90                         if (reg & DWC3_DSTS_DCNRD)
  91                                 udelay(5);
  92                         else
  93                                 break;
  94                 }
  95
  96                 if (retries <= 0)
  97                         return -ETIMEDOUT;
  98         }
  99
 100         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 101         reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
 102
 103         /* set requested state */
 104         reg |= DWC3_DCTL_ULSTCHNGREQ(state);
 105         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 106
 107         /*
 108          * The following code is racy when called from dwc3_gadget_wakeup,
 109          * and is not needed, at least on newer versions
 110          */
 111         if (dwc->revision >= DWC3_REVISION_194A)
 112                 return 0;
 113
 114         /* wait for a change in DSTS */
 115         retries = 10000;
 116         while (--retries) {
 117                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 118
 119                 if (DWC3_DSTS_USBLNKST(reg) == state)
 120                         return 0;
 121
 122                 udelay(5);
 123         }
 124
 125         dev_vdbg(dwc->dev, "link state change request timed out\n");
 126
 127         return -ETIMEDOUT;
 128 }
 129
 130 /**
 131  * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
 132  * @dwc: pointer to our context structure
 133  *
 134  * This function will a best effort FIFO allocation in order
 135  * to improve FIFO usage and throughput, while still allowing
 136  * us to enable as many endpoints as possible.
 137  *
 138  * Keep in mind that this operation will be highly dependent
 139  * on the configured size for RAM1 - which contains TxFifo -,
 140  * the amount of endpoints enabled on coreConsultant tool, and
 141  * the width of the Master Bus.
 142  *
 143  * In the ideal world, we would always be able to satisfy the
 144  * following equation:
 145  *
 146  * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
 147  * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
 148  *
 149  * Unfortunately, due to many variables that's not always the case.
 150  */
 151 int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
 152 {
 153         int             last_fifo_depth = 0;
 154         int             ram1_depth;
 155         int             fifo_size;
 156         int             mdwidth;
 157         int             num;
 158
 159         if (!dwc->needs_fifo_resize)
 160                 return 0;
 161
 162         ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
 163         mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
 164
 165         /* MDWIDTH is represented in bits, we need it in bytes */
 166         mdwidth >>= 3;
 167
 168         /*
 169          * FIXME For now we will only allocate 1 wMaxPacketSize space
 170          * for each enabled endpoint, later patches will come to
 171          * improve this algorithm so that we better use the internal
 172          * FIFO space
 173          */
 174         for (num = 0; num < DWC3_ENDPOINTS_NUM; num++) {
 175                 struct dwc3_ep  *dep = dwc->eps[num];
 176                 int             fifo_number = dep->number >> 1;
 177                 int             mult = 1;
 178                 int             tmp;
 179
 180                 if (!(dep->number & 1))
 181                         continue;
 182
 183                 if (!(dep->flags & DWC3_EP_ENABLED))
 184                         continue;
 185
 186                 if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
 187                                 || usb_endpoint_xfer_isoc(dep->endpoint.desc))
 188                         mult = 3;
 189
 190                 /*
 191                  * REVISIT: the following assumes we will always have enough
 192                  * space available on the FIFO RAM for all possible use cases.
 193                  * Make sure that's true somehow and change FIFO allocation
 194                  * accordingly.
 195                  *
 196                  * If we have Bulk or Isochronous endpoints, we want
 197                  * them to be able to be very, very fast. So we're giving
 198                  * those endpoints a fifo_size which is enough for 3 full
 199                  * packets
 200                  */
 201                 tmp = mult * (dep->endpoint.maxpacket + mdwidth);
 202                 tmp += mdwidth;
 203
 204                 fifo_size = DIV_ROUND_UP(tmp, mdwidth);
 205
 206                 fifo_size |= (last_fifo_depth << 16);
 207
 208                 dev_vdbg(dwc->dev, "%s: Fifo Addr %04x Size %d\n",
 209                                 dep->name, last_fifo_depth, fifo_size & 0xffff);
 210
 211                 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(fifo_number),
 212                                 fifo_size);
 213
 214                 last_fifo_depth += (fifo_size & 0xffff);
 215         }
 216
 217         return 0;
 218 }
 219
 220 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 221                 int status)
 222 {
 223         struct dwc3                     *dwc = dep->dwc;
 224         int                             i;
 225
 226         if (req->queued) {
 227                 i = 0;
 228                 do {
 229                         dep->busy_slot++;
 230                         /*
 231                          * Skip LINK TRB. We can't use req->trb and check for
 232                          * DWC3_TRBCTL_LINK_TRB because it points the TRB we
 233                          * just completed (not the LINK TRB).
 234                          */
 235                         if (((dep->busy_slot & DWC3_TRB_MASK) ==
 236                                 DWC3_TRB_NUM- 1) &&
 237                                 usb_endpoint_xfer_isoc(dep->endpoint.desc))
 238                                 dep->busy_slot++;
 239                 } while(++i < req->request.num_mapped_sgs);
 240                 req->queued = false;
 241         }
 242         list_del(&req->list);
 243         req->trb = NULL;
 244
 245         if (req->request.status == -EINPROGRESS)
 246                 req->request.status = status;
 247
 248         if (dwc->ep0_bounced && dep->number == 0)
 249                 dwc->ep0_bounced = false;
 250         else
 251                 usb_gadget_unmap_request(&dwc->gadget, &req->request,
 252                                 req->direction);
 253
 254         dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
 255                         req, dep->name, req->request.actual,
 256                         req->request.length, status);
 257
 258         spin_unlock(&dwc->lock);
 259         req->request.complete(&dep->endpoint, &req->request);
 260         spin_lock(&dwc->lock);
 261 }
 262
 263 static const char *dwc3_gadget_ep_cmd_string(u8 cmd)
 264 {
 265         switch (cmd) {
 266         case DWC3_DEPCMD_DEPSTARTCFG:
 267                 return "Start New Configuration";
 268         case DWC3_DEPCMD_ENDTRANSFER:
 269                 return "End Transfer";
 270         case DWC3_DEPCMD_UPDATETRANSFER:
 271                 return "Update Transfer";
 272         case DWC3_DEPCMD_STARTTRANSFER:
 273                 return "Start Transfer";
 274         case DWC3_DEPCMD_CLEARSTALL:
 275                 return "Clear Stall";
 276         case DWC3_DEPCMD_SETSTALL:
 277                 return "Set Stall";
 278         case DWC3_DEPCMD_GETEPSTATE:
 279                 return "Get Endpoint State";
 280         case DWC3_DEPCMD_SETTRANSFRESOURCE:
 281                 return "Set Endpoint Transfer Resource";
 282         case DWC3_DEPCMD_SETEPCONFIG:
 283                 return "Set Endpoint Configuration";
 284         default:
 285                 return "UNKNOWN command";
 286         }
 287 }
 288
 289 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param)
 290 {
 291         u32             timeout = 500;
 292         u32             reg;
 293
 294         dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
 295         dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
 296
 297         do {
 298                 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
 299                 if (!(reg & DWC3_DGCMD_CMDACT)) {
 300                         dev_vdbg(dwc->dev, "Command Complete --> %d\n",
 301                                         DWC3_DGCMD_STATUS(reg));
 302                         return 0;
 303                 }
 304
 305                 /*
 306                  * We can't sleep here, because it's also called from
 307                  * interrupt context.
 308                  */
 309                 timeout--;
 310                 if (!timeout)
 311                         return -ETIMEDOUT;
 312                 udelay(1);
 313         } while (1);
 314 }
 315
 316 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
 317                 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
 318 {
 319         struct dwc3_ep          *dep = dwc->eps[ep];
 320         u32                     timeout = 500;
 321         u32                     reg;
 322
 323         dev_vdbg(dwc->dev, "%s: cmd '%s' params %08x %08x %08x\n",
 324                         dep->name,
 325                         dwc3_gadget_ep_cmd_string(cmd), params->param0,
 326                         params->param1, params->param2);
 327
 328         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
 329         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
 330         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
 331
 332         dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
 333         do {
 334                 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
 335                 if (!(reg & DWC3_DEPCMD_CMDACT)) {
 336                         dev_vdbg(dwc->dev, "Command Complete --> %d\n",
 337                                         DWC3_DEPCMD_STATUS(reg));
 338                         return 0;
 339                 }
 340
 341                 /*
 342                  * We can't sleep here, because it is also called from
 343                  * interrupt context.
 344                  */
 345                 timeout--;
 346                 if (!timeout)
 347                         return -ETIMEDOUT;
 348
 349                 udelay(1);
 350         } while (1);
 351 }
 352
 353 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
 354                 struct dwc3_trb *trb)
 355 {
 356         u32             offset = (char *) trb - (char *) dep->trb_pool;
 357
 358         return dep->trb_pool_dma + offset;
 359 }
 360
 361 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
 362 {
 363         struct dwc3             *dwc = dep->dwc;
 364
 365         if (dep->trb_pool)
 366                 return 0;
 367
 368         if (dep->number == 0 || dep->number == 1)
 369                 return 0;
 370
 371         dep->trb_pool = dma_alloc_coherent(dwc->dev,
 372                         sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 373                         &dep->trb_pool_dma, GFP_KERNEL);
 374         if (!dep->trb_pool) {
 375                 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
 376                                 dep->name);
 377                 return -ENOMEM;
 378         }
 379
 380         return 0;
 381 }
 382
 383 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
 384 {
 385         struct dwc3             *dwc = dep->dwc;
 386
 387         dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 388                         dep->trb_pool, dep->trb_pool_dma);
 389
 390         dep->trb_pool = NULL;
 391         dep->trb_pool_dma = 0;
 392 }
 393
 394 static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
 395 {
 396         struct dwc3_gadget_ep_cmd_params params;
 397         u32                     cmd;
 398
 399         memset(&params, 0x00, sizeof(params));
 400
 401         if (dep->number != 1) {
 402                 cmd = DWC3_DEPCMD_DEPSTARTCFG;
 403                 /* XferRscIdx == 0 for ep0 and 2 for the remaining */
 404                 if (dep->number > 1) {
 405                         if (dwc->start_config_issued)
 406                                 return 0;
 407                         dwc->start_config_issued = true;
 408                         cmd |= DWC3_DEPCMD_PARAM(2);
 409                 }
 410
 411                 return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, &params);
 412         }
 413
 414         return 0;
 415 }
 416
 417 static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
 418                 const struct usb_endpoint_descriptor *desc,
 419                 const struct usb_ss_ep_comp_descriptor *comp_desc,
 420                 bool ignore)
 421 {
 422         struct dwc3_gadget_ep_cmd_params params;
 423
 424         memset(&params, 0x00, sizeof(params));
 425
 426         params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
 427                 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
 428
 429         /* Burst size is only needed in SuperSpeed mode */
 430         if (dwc->gadget.speed == USB_SPEED_SUPER) {
 431                 u32 burst = dep->endpoint.maxburst - 1;
 432
 433                 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst);
 434         }
 435
 436         if (ignore)
 437                 params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
 438
 439         params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
 440                 | DWC3_DEPCFG_XFER_NOT_READY_EN;
 441
 442         if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
 443                 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
 444                         | DWC3_DEPCFG_STREAM_EVENT_EN;
 445                 dep->stream_capable = true;
 446         }
 447
 448         if (usb_endpoint_xfer_isoc(desc))
 449                 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
 450
 451         /*
 452          * We are doing 1:1 mapping for endpoints, meaning
 453          * Physical Endpoints 2 maps to Logical Endpoint 2 and
 454          * so on. We consider the direction bit as part of the physical
 455          * endpoint number. So USB endpoint 0x81 is 0x03.
 456          */
 457         params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
 458
 459         /*
 460          * We must use the lower 16 TX FIFOs even though
 461          * HW might have more
 462          */
 463         if (dep->direction)
 464                 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
 465
 466         if (desc->bInterval) {
 467                 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
 468                 dep->interval = 1 << (desc->bInterval - 1);
 469         }
 470
 471         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 472                         DWC3_DEPCMD_SETEPCONFIG, &params);
 473 }
 474
 475 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
 476 {
 477         struct dwc3_gadget_ep_cmd_params params;
 478
 479         memset(&params, 0x00, sizeof(params));
 480
 481         params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
 482
 483         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 484                         DWC3_DEPCMD_SETTRANSFRESOURCE, &params);
 485 }
 486
 487 /**
 488  * __dwc3_gadget_ep_enable - Initializes a HW endpoint
 489  * @dep: endpoint to be initialized
 490  * @desc: USB Endpoint Descriptor
 491  *
 492  * Caller should take care of locking
 493  */
 494 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
 495                 const struct usb_endpoint_descriptor *desc,
 496                 const struct usb_ss_ep_comp_descriptor *comp_desc,
 497                 bool ignore)
 498 {
 499         struct dwc3             *dwc = dep->dwc;
 500         u32                     reg;
 501         int                     ret = -ENOMEM;
 502
 503         dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);
 504
 505         if (!(dep->flags & DWC3_EP_ENABLED)) {
 506                 ret = dwc3_gadget_start_config(dwc, dep);
 507                 if (ret)
 508                         return ret;
 509         }
 510
 511         ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore);
 512         if (ret)
 513                 return ret;
 514
 515         if (!(dep->flags & DWC3_EP_ENABLED)) {
 516                 struct dwc3_trb *trb_st_hw;
 517                 struct dwc3_trb *trb_link;
 518
 519                 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
 520                 if (ret)
 521                         return ret;
 522
 523                 dep->endpoint.desc = desc;
 524                 dep->comp_desc = comp_desc;
 525                 dep->type = usb_endpoint_type(desc);
 526                 dep->flags |= DWC3_EP_ENABLED;
 527
 528                 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 529                 reg |= DWC3_DALEPENA_EP(dep->number);
 530                 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 531
 532                 if (!usb_endpoint_xfer_isoc(desc))
 533                         return 0;
 534
 535                 memset(&trb_link, 0, sizeof(trb_link));
 536
 537                 /* Link TRB for ISOC. The HWO bit is never reset */
 538                 trb_st_hw = &dep->trb_pool[0];
 539
 540                 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
 541
 542                 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 543                 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 544                 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
 545                 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
 546         }
 547
 548         return 0;
 549 }
 550
 551 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum);
 552 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 553 {
 554         struct dwc3_request             *req;
 555
 556         if (!list_empty(&dep->req_queued)) {
 557                 dwc3_stop_active_transfer(dwc, dep->number);
 558
 559                 /* - giveback all requests to gadget driver */
 560                 while (!list_empty(&dep->req_queued)) {
 561                         req = next_request(&dep->req_queued);
 562
 563                         dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 564                 }
 565         }
 566
 567         while (!list_empty(&dep->request_list)) {
 568                 req = next_request(&dep->request_list);
 569
 570                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 571         }
 572 }
 573
 574 /**
 575  * __dwc3_gadget_ep_disable - Disables a HW endpoint
 576  * @dep: the endpoint to disable
 577  *
 578  * This function also removes requests which are currently processed ny the
 579  * hardware and those which are not yet scheduled.
 580  * Caller should take care of locking.
 581  */
 582 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
 583 {
 584         struct dwc3             *dwc = dep->dwc;
 585         u32                     reg;
 586
 587         dwc3_remove_requests(dwc, dep);
 588
 589         reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 590         reg &= ~DWC3_DALEPENA_EP(dep->number);
 591         dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 592
 593         dep->stream_capable = false;
 594         dep->endpoint.desc = NULL;
 595         dep->comp_desc = NULL;
 596         dep->type = 0;
 597         dep->flags = 0;
 598
 599         return 0;
 600 }
 601
 602 /* -------------------------------------------------------------------------- */
 603
 604 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
 605                 const struct usb_endpoint_descriptor *desc)
 606 {
 607         return -EINVAL;
 608 }
 609
 610 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
 611 {
 612         return -EINVAL;
 613 }
 614
 615 /* -------------------------------------------------------------------------- */
 616
 617 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
 618                 const struct usb_endpoint_descriptor *desc)
 619 {
 620         struct dwc3_ep                  *dep;
 621         struct dwc3                     *dwc;
 622         unsigned long                   flags;
 623         int                             ret;
 624
 625         if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
 626                 pr_debug("dwc3: invalid parameters\n");
 627                 return -EINVAL;
 628         }
 629
 630         if (!desc->wMaxPacketSize) {
 631                 pr_debug("dwc3: missing wMaxPacketSize\n");
 632                 return -EINVAL;
 633         }
 634
 635         dep = to_dwc3_ep(ep);
 636         dwc = dep->dwc;
 637
 638         if (dep->flags & DWC3_EP_ENABLED) {
 639                 dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n",
 640                                 dep->name);
 641                 return 0;
 642         }
 643
 644         switch (usb_endpoint_type(desc)) {
 645         case USB_ENDPOINT_XFER_CONTROL:
 646                 strlcat(dep->name, "-control", sizeof(dep->name));
 647                 break;
 648         case USB_ENDPOINT_XFER_ISOC:
 649                 strlcat(dep->name, "-isoc", sizeof(dep->name));
 650                 break;
 651         case USB_ENDPOINT_XFER_BULK:
 652                 strlcat(dep->name, "-bulk", sizeof(dep->name));
 653                 break;
 654         case USB_ENDPOINT_XFER_INT:
 655                 strlcat(dep->name, "-int", sizeof(dep->name));
 656                 break;
 657         default:
 658                 dev_err(dwc->dev, "invalid endpoint transfer type\n");
 659         }
 660
 661         spin_lock_irqsave(&dwc->lock, flags);
 662         ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false);
 663         spin_unlock_irqrestore(&dwc->lock, flags);
 664
 665         return ret;
 666 }
 667
 668 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
 669 {
 670         struct dwc3_ep                  *dep;
 671         struct dwc3                     *dwc;
 672         unsigned long                   flags;
 673         int                             ret;
 674
 675         if (!ep) {
 676                 pr_debug("dwc3: invalid parameters\n");
 677                 return -EINVAL;
 678         }
 679
 680         dep = to_dwc3_ep(ep);
 681         dwc = dep->dwc;
 682
 683         if (!(dep->flags & DWC3_EP_ENABLED)) {
 684                 dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n",
 685                                 dep->name);
 686                 return 0;
 687         }
 688
 689         snprintf(dep->name, sizeof(dep->name), "ep%d%s",
 690                         dep->number >> 1,
 691                         (dep->number & 1) ? "in" : "out");
 692
 693         spin_lock_irqsave(&dwc->lock, flags);
 694         ret = __dwc3_gadget_ep_disable(dep);
 695         spin_unlock_irqrestore(&dwc->lock, flags);
 696
 697         return ret;
 698 }
 699
 700 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
 701         gfp_t gfp_flags)
 702 {
 703         struct dwc3_request             *req;
 704         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 705         struct dwc3                     *dwc = dep->dwc;
 706
 707         req = kzalloc(sizeof(*req), gfp_flags);
 708         if (!req) {
 709                 dev_err(dwc->dev, "not enough memory\n");
 710                 return NULL;
 711         }
 712
 713         req->epnum      = dep->number;
 714         req->dep        = dep;
 715
 716         return &req->request;
 717 }
 718
 719 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
 720                 struct usb_request *request)
 721 {
 722         struct dwc3_request             *req = to_dwc3_request(request);
 723
 724         kfree(req);
 725 }
 726
 727 /**
 728  * dwc3_prepare_one_trb - setup one TRB from one request
 729  * @dep: endpoint for which this request is prepared
 730  * @req: dwc3_request pointer
 731  */
 732 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
 733                 struct dwc3_request *req, dma_addr_t dma,
 734                 unsigned length, unsigned last, unsigned chain, unsigned node)
 735 {
 736         struct dwc3             *dwc = dep->dwc;
 737         struct dwc3_trb         *trb;
 738
 739         dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n",
 740                         dep->name, req, (unsigned long long) dma,
 741                         length, last ? " last" : "",
 742                         chain ? " chain" : "");
 743
 744         /* Skip the LINK-TRB on ISOC */
 745         if (((dep->free_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
 746                         usb_endpoint_xfer_isoc(dep->endpoint.desc))
 747                 dep->free_slot++;
 748
 749         trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
 750
 751         if (!req->trb) {
 752                 dwc3_gadget_move_request_queued(req);
 753                 req->trb = trb;
 754                 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
 755                 req->start_slot = dep->free_slot & DWC3_TRB_MASK;
 756         }
 757
 758         dep->free_slot++;
 759
 760         trb->size = DWC3_TRB_SIZE_LENGTH(length);
 761         trb->bpl = lower_32_bits(dma);
 762         trb->bph = upper_32_bits(dma);
 763
 764         switch (usb_endpoint_type(dep->endpoint.desc)) {
 765         case USB_ENDPOINT_XFER_CONTROL:
 766                 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
 767                 break;
 768
 769         case USB_ENDPOINT_XFER_ISOC:
 770                 if (!node)
 771                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
 772                 else
 773                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
 774
 775                 if (!req->request.no_interrupt && !chain)
 776                         trb->ctrl |= DWC3_TRB_CTRL_IOC;
 777                 break;
 778
 779         case USB_ENDPOINT_XFER_BULK:
 780         case USB_ENDPOINT_XFER_INT:
 781                 trb->ctrl = DWC3_TRBCTL_NORMAL;
 782                 break;
 783         default:
 784                 /*
 785                  * This is only possible with faulty memory because we
 786                  * checked it already :)
 787                  */
 788                 BUG();
 789         }
 790
 791         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 792                 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
 793                 trb->ctrl |= DWC3_TRB_CTRL_CSP;
 794         } else if (last) {
 795                 trb->ctrl |= DWC3_TRB_CTRL_LST;
 796         }
 797
 798         if (chain)
 799                 trb->ctrl |= DWC3_TRB_CTRL_CHN;
 800
 801         if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
 802                 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
 803
 804         trb->ctrl |= DWC3_TRB_CTRL_HWO;
 805 }
 806
 807 /*
 808  * dwc3_prepare_trbs - setup TRBs from requests
 809  * @dep: endpoint for which requests are being prepared
 810  * @starting: true if the endpoint is idle and no requests are queued.
 811  *
 812  * The function goes through the requests list and sets up TRBs for the
 813  * transfers. The function returns once there are no more TRBs available or
 814  * it runs out of requests.
 815  */
 816 static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting)
 817 {
 818         struct dwc3_request     *req, *n;
 819         u32                     trbs_left;
 820         u32                     max;
 821         unsigned int            last_one = 0;
 822
 823         BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
 824
 825         /* the first request must not be queued */
 826         trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
 827
 828         /* Can't wrap around on a non-isoc EP since there's no link TRB */
 829         if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 830                 max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK);
 831                 if (trbs_left > max)
 832                         trbs_left = max;
 833         }
 834
 835         /*
 836          * If busy & slot are equal than it is either full or empty. If we are
 837          * starting to process requests then we are empty. Otherwise we are
 838          * full and don't do anything
 839          */
 840         if (!trbs_left) {
 841                 if (!starting)
 842                         return;
 843                 trbs_left = DWC3_TRB_NUM;
 844                 /*
 845                  * In case we start from scratch, we queue the ISOC requests
 846                  * starting from slot 1. This is done because we use ring
 847                  * buffer and have no LST bit to stop us. Instead, we place
 848                  * IOC bit every TRB_NUM/4. We try to avoid having an interrupt
 849                  * after the first request so we start at slot 1 and have
 850                  * 7 requests proceed before we hit the first IOC.
 851                  * Other transfer types don't use the ring buffer and are
 852                  * processed from the first TRB until the last one. Since we
 853                  * don't wrap around we have to start at the beginning.
 854                  */
 855                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 856                         dep->busy_slot = 1;
 857                         dep->free_slot = 1;
 858                 } else {
 859                         dep->busy_slot = 0;
 860                         dep->free_slot = 0;
 861                 }
 862         }
 863
 864         /* The last TRB is a link TRB, not used for xfer */
 865         if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc))
 866                 return;
 867
 868         list_for_each_entry_safe(req, n, &dep->request_list, list) {
 869                 unsigned        length;
 870                 dma_addr_t      dma;
 871                 last_one = false;
 872
 873                 if (req->request.num_mapped_sgs > 0) {
 874                         struct usb_request *request = &req->request;
 875                         struct scatterlist *sg = request->sg;
 876                         struct scatterlist *s;
 877                         int             i;
 878
 879                         for_each_sg(sg, s, request->num_mapped_sgs, i) {
 880                                 unsigned chain = true;
 881
 882                                 length = sg_dma_len(s);
 883                                 dma = sg_dma_address(s);
 884
 885                                 if (i == (request->num_mapped_sgs - 1) ||
 886                                                 sg_is_last(s)) {
 887                                         if (list_is_last(&req->list,
 888                                                         &dep->request_list))
 889                                                 last_one = true;
 890                                         chain = false;
 891                                 }
 892
 893                                 trbs_left--;
 894                                 if (!trbs_left)
 895                                         last_one = true;
 896
 897                                 if (last_one)
 898                                         chain = false;
 899
 900                                 dwc3_prepare_one_trb(dep, req, dma, length,
 901                                                 last_one, chain, i);
 902
 903                                 if (last_one)
 904                                         break;
 905                         }
 906                 } else {
 907                         dma = req->request.dma;
 908                         length = req->request.length;
 909                         trbs_left--;
 910
 911                         if (!trbs_left)
 912                                 last_one = 1;
 913
 914                         /* Is this the last request? */
 915                         if (list_is_last(&req->list, &dep->request_list))
 916                                 last_one = 1;
 917
 918                         dwc3_prepare_one_trb(dep, req, dma, length,
 919                                         last_one, false, 0);
 920
 921                         if (last_one)
 922                                 break;
 923                 }
 924         }
 925 }
 926
 927 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
 928                 int start_new)
 929 {
 930         struct dwc3_gadget_ep_cmd_params params;
 931         struct dwc3_request             *req;
 932         struct dwc3                     *dwc = dep->dwc;
 933         int                             ret;
 934         u32                             cmd;
 935
 936         if (start_new && (dep->flags & DWC3_EP_BUSY)) {
 937                 dev_vdbg(dwc->dev, "%s: endpoint busy\n", dep->name);
 938                 return -EBUSY;
 939         }
 940         dep->flags &= ~DWC3_EP_PENDING_REQUEST;
 941
 942         /*
 943          * If we are getting here after a short-out-packet we don't enqueue any
 944          * new requests as we try to set the IOC bit only on the last request.
 945          */
 946         if (start_new) {
 947                 if (list_empty(&dep->req_queued))
 948                         dwc3_prepare_trbs(dep, start_new);
 949
 950                 /* req points to the first request which will be sent */
 951                 req = next_request(&dep->req_queued);
 952         } else {
 953                 dwc3_prepare_trbs(dep, start_new);
 954
 955                 /*
 956                  * req points to the first request where HWO changed from 0 to 1
 957                  */
 958                 req = next_request(&dep->req_queued);
 959         }
 960         if (!req) {
 961                 dep->flags |= DWC3_EP_PENDING_REQUEST;
 962                 return 0;
 963         }
 964
 965         memset(&params, 0, sizeof(params));
 966
 967         if (start_new) {
 968                 params.param0 = upper_32_bits(req->trb_dma);
 969                 params.param1 = lower_32_bits(req->trb_dma);
 970                 cmd = DWC3_DEPCMD_STARTTRANSFER;
 971         } else {
 972                 cmd = DWC3_DEPCMD_UPDATETRANSFER;
 973         }
 974
 975         cmd |= DWC3_DEPCMD_PARAM(cmd_param);
 976         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
 977         if (ret < 0) {
 978                 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
 979
 980                 /*
 981                  * FIXME we need to iterate over the list of requests
 982                  * here and stop, unmap, free and del each of the linked
 983                  * requests instead of what we do now.
 984                  */
 985                 usb_gadget_unmap_request(&dwc->gadget, &req->request,
 986                                 req->direction);
 987                 list_del(&req->list);
 988                 return ret;
 989         }
 990
 991         dep->flags |= DWC3_EP_BUSY;
 992
 993         if (start_new) {
 994                 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
 995                                 dep->number);
 996                 WARN_ON_ONCE(!dep->resource_index);
 997         }
 998
 999         return 0;
1000 }
1001
1002 static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
1003                 struct dwc3_ep *dep, u32 cur_uf)
1004 {
1005         u32 uf;
1006
1007         if (list_empty(&dep->request_list)) {
1008                 dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n",
1009                         dep->name);
1010                 dep->flags |= DWC3_EP_PENDING_REQUEST;
1011                 return;
1012         }
1013
1014         /* 4 micro frames in the future */
1015         uf = cur_uf + dep->interval * 4;
1016
1017         __dwc3_gadget_kick_transfer(dep, uf, 1);
1018 }
1019
1020 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1021                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1022 {
1023         u32 cur_uf, mask;
1024
1025         mask = ~(dep->interval - 1);
1026         cur_uf = event->parameters & mask;
1027
1028         __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1029 }
1030
1031 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1032 {
1033         struct dwc3             *dwc = dep->dwc;
1034         int                     ret;
1035
1036         req->request.actual     = 0;
1037         req->request.status     = -EINPROGRESS;
1038         req->direction          = dep->direction;
1039         req->epnum              = dep->number;
1040
1041         /*
1042          * We only add to our list of requests now and
1043          * start consuming the list once we get XferNotReady
1044          * IRQ.
1045          *
1046          * That way, we avoid doing anything that we don't need
1047          * to do now and defer it until the point we receive a
1048          * particular token from the Host side.
1049          *
1050          * This will also avoid Host cancelling URBs due to too
1051          * many NAKs.
1052          */
1053         ret = usb_gadget_map_request(&dwc->gadget, &req->request,
1054                         dep->direction);
1055         if (ret)
1056                 return ret;
1057
1058         list_add_tail(&req->list, &dep->request_list);
1059
1060         /*
1061          * There are a few special cases:
1062          *
1063          * 1. XferNotReady with empty list of requests. We need to kick the
1064          *    transfer here in that situation, otherwise we will be NAKing
1065          *    forever. If we get XferNotReady before gadget driver has a
1066          *    chance to queue a request, we will ACK the IRQ but won't be
1067          *    able to receive the data until the next request is queued.
1068          *    The following code is handling exactly that.
1069          *
1070          */
1071         if (dep->flags & DWC3_EP_PENDING_REQUEST) {
1072                 /*
1073                  * If xfernotready is already elapsed and it is a case
1074                  * of isoc transfer, then issue END TRANSFER, so that
1075                  * you can receive xfernotready again and can have
1076                  * notion of current microframe.
1077                  */
1078                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1079                         if (list_empty(&dep->req_queued)) {
1080                                 dwc3_stop_active_transfer(dwc, dep->number);
1081                                 dep->flags = DWC3_EP_ENABLED;
1082                         }
1083                         return 0;
1084                 }
1085
1086                 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1087                 if (ret && ret != -EBUSY)
1088                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1089                                         dep->name);
1090                 return ret;
1091         }
1092
1093         /*
1094          * 2. XferInProgress on Isoc EP with an active transfer. We need to
1095          *    kick the transfer here after queuing a request, otherwise the
1096          *    core may not see the modified TRB(s).
1097          */
1098         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1099                         (dep->flags & DWC3_EP_BUSY) &&
1100                         !(dep->flags & DWC3_EP_MISSED_ISOC)) {
1101                 WARN_ON_ONCE(!dep->resource_index);
1102                 ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index,
1103                                 false);
1104                 if (ret && ret != -EBUSY)
1105                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1106                                         dep->name);
1107                 return ret;
1108         }
1109
1110         return 0;
1111 }
1112
1113 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1114         gfp_t gfp_flags)
1115 {
1116         struct dwc3_request             *req = to_dwc3_request(request);
1117         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1118         struct dwc3                     *dwc = dep->dwc;
1119
1120         unsigned long                   flags;
1121
1122         int                             ret;
1123
1124         if (!dep->endpoint.desc) {
1125                 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
1126                                 request, ep->name);
1127                 return -ESHUTDOWN;
1128         }
1129
1130         dev_vdbg(dwc->dev, "queing request %p to %s length %d\n",
1131                         request, ep->name, request->length);
1132
1133         spin_lock_irqsave(&dwc->lock, flags);
1134         ret = __dwc3_gadget_ep_queue(dep, req);
1135         spin_unlock_irqrestore(&dwc->lock, flags);
1136
1137         return ret;
1138 }
1139
1140 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1141                 struct usb_request *request)
1142 {
1143         struct dwc3_request             *req = to_dwc3_request(request);
1144         struct dwc3_request             *r = NULL;
1145
1146         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1147         struct dwc3                     *dwc = dep->dwc;
1148
1149         unsigned long                   flags;
1150         int                             ret = 0;
1151
1152         spin_lock_irqsave(&dwc->lock, flags);
1153
1154         list_for_each_entry(r, &dep->request_list, list) {
1155                 if (r == req)
1156                         break;
1157         }
1158
1159         if (r != req) {
1160                 list_for_each_entry(r, &dep->req_queued, list) {
1161                         if (r == req)
1162                                 break;
1163                 }
1164                 if (r == req) {
1165                         /* wait until it is processed */
1166                         dwc3_stop_active_transfer(dwc, dep->number);
1167                         goto out1;
1168                 }
1169                 dev_err(dwc->dev, "request %p was not queued to %s\n",
1170                                 request, ep->name);
1171                 ret = -EINVAL;
1172                 goto out0;
1173         }
1174
1175 out1:
1176         /* giveback the request */
1177         dwc3_gadget_giveback(dep, req, -ECONNRESET);
1178
1179 out0:
1180         spin_unlock_irqrestore(&dwc->lock, flags);
1181
1182         return ret;
1183 }
1184
1185 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
1186 {
1187         struct dwc3_gadget_ep_cmd_params        params;
1188         struct dwc3                             *dwc = dep->dwc;
1189         int                                     ret;
1190
1191         memset(&params, 0x00, sizeof(params));
1192
1193         if (value) {
1194                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1195                         DWC3_DEPCMD_SETSTALL, &params);
1196                 if (ret)
1197                         dev_err(dwc->dev, "failed to %s STALL on %s\n",
1198                                         value ? "set" : "clear",
1199                                         dep->name);
1200                 else
1201                         dep->flags |= DWC3_EP_STALL;
1202         } else {
1203                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1204                         DWC3_DEPCMD_CLEARSTALL, &params);
1205                 if (ret)
1206                         dev_err(dwc->dev, "failed to %s STALL on %s\n",
1207                                         value ? "set" : "clear",
1208                                         dep->name);
1209                 else
1210                         dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1211         }
1212
1213         return ret;
1214 }
1215
1216 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1217 {
1218         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1219         struct dwc3                     *dwc = dep->dwc;
1220
1221         unsigned long                   flags;
1222
1223         int                             ret;
1224
1225         spin_lock_irqsave(&dwc->lock, flags);
1226
1227         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1228                 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1229                 ret = -EINVAL;
1230                 goto out;
1231         }
1232
1233         ret = __dwc3_gadget_ep_set_halt(dep, value);
1234 out:
1235         spin_unlock_irqrestore(&dwc->lock, flags);
1236
1237         return ret;
1238 }
1239
1240 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1241 {
1242         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1243         struct dwc3                     *dwc = dep->dwc;
1244         unsigned long                   flags;
1245
1246         spin_lock_irqsave(&dwc->lock, flags);
1247         dep->flags |= DWC3_EP_WEDGE;
1248         spin_unlock_irqrestore(&dwc->lock, flags);
1249
1250         if (dep->number == 0 || dep->number == 1)
1251                 return dwc3_gadget_ep0_set_halt(ep, 1);
1252         else
1253                 return dwc3_gadget_ep_set_halt(ep, 1);
1254 }
1255
1256 /* -------------------------------------------------------------------------- */
1257
1258 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1259         .bLength        = USB_DT_ENDPOINT_SIZE,
1260         .bDescriptorType = USB_DT_ENDPOINT,
1261         .bmAttributes   = USB_ENDPOINT_XFER_CONTROL,
1262 };
1263
1264 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1265         .enable         = dwc3_gadget_ep0_enable,
1266         .disable        = dwc3_gadget_ep0_disable,
1267         .alloc_request  = dwc3_gadget_ep_alloc_request,
1268         .free_request   = dwc3_gadget_ep_free_request,
1269         .queue          = dwc3_gadget_ep0_queue,
1270         .dequeue        = dwc3_gadget_ep_dequeue,
1271         .set_halt       = dwc3_gadget_ep0_set_halt,
1272         .set_wedge      = dwc3_gadget_ep_set_wedge,
1273 };
1274
1275 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1276         .enable         = dwc3_gadget_ep_enable,
1277         .disable        = dwc3_gadget_ep_disable,
1278         .alloc_request  = dwc3_gadget_ep_alloc_request,
1279         .free_request   = dwc3_gadget_ep_free_request,
1280         .queue          = dwc3_gadget_ep_queue,
1281         .dequeue        = dwc3_gadget_ep_dequeue,
1282         .set_halt       = dwc3_gadget_ep_set_halt,
1283         .set_wedge      = dwc3_gadget_ep_set_wedge,
1284 };
1285
1286 /* -------------------------------------------------------------------------- */
1287
1288 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1289 {
1290         struct dwc3             *dwc = gadget_to_dwc(g);
1291         u32                     reg;
1292
1293         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1294         return DWC3_DSTS_SOFFN(reg);
1295 }
1296
1297 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1298 {
1299         struct dwc3             *dwc = gadget_to_dwc(g);
1300
1301         unsigned long           timeout;
1302         unsigned long           flags;
1303
1304         u32                     reg;
1305
1306         int                     ret = 0;
1307
1308         u8                      link_state;
1309         u8                      speed;
1310
1311         spin_lock_irqsave(&dwc->lock, flags);
1312
1313         /*
1314          * According to the Databook Remote wakeup request should
1315          * be issued only when the device is in early suspend state.
1316          *
1317          * We can check that via USB Link State bits in DSTS register.
1318          */
1319         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1320
1321         speed = reg & DWC3_DSTS_CONNECTSPD;
1322         if (speed == DWC3_DSTS_SUPERSPEED) {
1323                 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n");
1324                 ret = -EINVAL;
1325                 goto out;
1326         }
1327
1328         link_state = DWC3_DSTS_USBLNKST(reg);
1329
1330         switch (link_state) {
1331         case DWC3_LINK_STATE_RX_DET:    /* in HS, means Early Suspend */
1332         case DWC3_LINK_STATE_U3:        /* in HS, means SUSPEND */
1333                 break;
1334         default:
1335                 dev_dbg(dwc->dev, "can't wakeup from link state %d\n",
1336                                 link_state);
1337                 ret = -EINVAL;
1338                 goto out;
1339         }
1340
1341         ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1342         if (ret < 0) {
1343                 dev_err(dwc->dev, "failed to put link in Recovery\n");
1344                 goto out;
1345         }
1346
1347         /* Recent versions do this automatically */
1348         if (dwc->revision < DWC3_REVISION_194A) {
1349                 /* write zeroes to Link Change Request */
1350                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1351                 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1352                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1353         }
1354
1355         /* poll until Link State changes to ON */
1356         timeout = jiffies + msecs_to_jiffies(100);
1357
1358         while (!time_after(jiffies, timeout)) {
1359                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1360
1361                 /* in HS, means ON */
1362                 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1363                         break;
1364         }
1365
1366         if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1367                 dev_err(dwc->dev, "failed to send remote wakeup\n");
1368                 ret = -EINVAL;
1369         }
1370
1371 out:
1372         spin_unlock_irqrestore(&dwc->lock, flags);
1373
1374         return ret;
1375 }
1376
1377 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1378                 int is_selfpowered)
1379 {
1380         struct dwc3             *dwc = gadget_to_dwc(g);
1381         unsigned long           flags;
1382
1383         spin_lock_irqsave(&dwc->lock, flags);
1384         dwc->is_selfpowered = !!is_selfpowered;
1385         spin_unlock_irqrestore(&dwc->lock, flags);
1386
1387         return 0;
1388 }
1389
1390 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on)
1391 {
1392         u32                     reg;
1393         u32                     timeout = 500;
1394
1395         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1396         if (is_on) {
1397                 if (dwc->revision <= DWC3_REVISION_187A) {
1398                         reg &= ~DWC3_DCTL_TRGTULST_MASK;
1399                         reg |= DWC3_DCTL_TRGTULST_RX_DET;
1400                 }
1401
1402                 if (dwc->revision >= DWC3_REVISION_194A)
1403                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1404                 reg |= DWC3_DCTL_RUN_STOP;
1405                 dwc->pullups_connected = true;
1406         } else {
1407                 reg &= ~DWC3_DCTL_RUN_STOP;
1408                 dwc->pullups_connected = false;
1409         }
1410
1411         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1412
1413         do {
1414                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1415                 if (is_on) {
1416                         if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1417                                 break;
1418                 } else {
1419                         if (reg & DWC3_DSTS_DEVCTRLHLT)
1420                                 break;
1421                 }
1422                 timeout--;
1423                 if (!timeout)
1424                         return -ETIMEDOUT;
1425                 udelay(1);
1426         } while (1);
1427
1428         dev_vdbg(dwc->dev, "gadget %s data soft-%s\n",
1429                         dwc->gadget_driver
1430                         ? dwc->gadget_driver->function : "no-function",
1431                         is_on ? "connect" : "disconnect");
1432
1433         return 0;
1434 }
1435
1436 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1437 {
1438         struct dwc3             *dwc = gadget_to_dwc(g);
1439         unsigned long           flags;
1440         int                     ret;
1441
1442         is_on = !!is_on;
1443
1444         spin_lock_irqsave(&dwc->lock, flags);
1445         ret = dwc3_gadget_run_stop(dwc, is_on);
1446         spin_unlock_irqrestore(&dwc->lock, flags);
1447
1448         return ret;
1449 }
1450
1451 static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1452 {
1453         u32                     reg;
1454
1455         /* Enable all but Start and End of Frame IRQs */
1456         reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1457                         DWC3_DEVTEN_EVNTOVERFLOWEN |
1458                         DWC3_DEVTEN_CMDCMPLTEN |
1459                         DWC3_DEVTEN_ERRTICERREN |
1460                         DWC3_DEVTEN_WKUPEVTEN |
1461                         DWC3_DEVTEN_ULSTCNGEN |
1462                         DWC3_DEVTEN_CONNECTDONEEN |
1463                         DWC3_DEVTEN_USBRSTEN |
1464                         DWC3_DEVTEN_DISCONNEVTEN);
1465
1466         dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1467 }
1468
1469 static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1470 {
1471         /* mask all interrupts */
1472         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1473 }
1474
1475 static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1476 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1477
1478 static int dwc3_gadget_start(struct usb_gadget *g,
1479                 struct usb_gadget_driver *driver)
1480 {
1481         struct dwc3             *dwc = gadget_to_dwc(g);
1482         struct dwc3_ep          *dep;
1483         unsigned long           flags;
1484         int                     ret = 0;
1485         int                     irq;
1486         u32                     reg;
1487
1488         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1489         ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
1490                         IRQF_SHARED, "dwc3", dwc);
1491         if (ret) {
1492                 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
1493                                 irq, ret);
1494                 goto err0;
1495         }
1496
1497         spin_lock_irqsave(&dwc->lock, flags);
1498
1499         if (dwc->gadget_driver) {
1500                 dev_err(dwc->dev, "%s is already bound to %s\n",
1501                                 dwc->gadget.name,
1502                                 dwc->gadget_driver->driver.name);
1503                 ret = -EBUSY;
1504                 goto err1;
1505         }
1506
1507         dwc->gadget_driver      = driver;
1508
1509         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1510         reg &= ~(DWC3_DCFG_SPEED_MASK);
1511
1512         /**
1513          * WORKAROUND: DWC3 revision < 2.20a have an issue
1514          * which would cause metastability state on Run/Stop
1515          * bit if we try to force the IP to USB2-only mode.
1516          *
1517          * Because of that, we cannot configure the IP to any
1518          * speed other than the SuperSpeed
1519          *
1520          * Refers to:
1521          *
1522          * STAR#9000525659: Clock Domain Crossing on DCTL in
1523          * USB 2.0 Mode
1524          */
1525         if (dwc->revision < DWC3_REVISION_220A) {
1526                 reg |= DWC3_DCFG_SUPERSPEED;
1527         } else {
1528                 switch (dwc->maximum_speed) {
1529                 case USB_SPEED_LOW:
1530                         reg |= DWC3_DSTS_LOWSPEED;
1531                         break;
1532                 case USB_SPEED_FULL:
1533                         reg |= DWC3_DSTS_FULLSPEED1;
1534                         break;
1535                 case USB_SPEED_HIGH:
1536                         reg |= DWC3_DSTS_HIGHSPEED;
1537                         break;
1538                 case USB_SPEED_SUPER:   /* FALLTHROUGH */
1539                 case USB_SPEED_UNKNOWN: /* FALTHROUGH */
1540                 default:
1541                         reg |= DWC3_DSTS_SUPERSPEED;
1542                 }
1543         }
1544         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1545
1546         dwc->start_config_issued = false;
1547
1548         /* Start with SuperSpeed Default */
1549         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1550
1551         dep = dwc->eps[0];
1552         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
1553         if (ret) {
1554                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1555                 goto err2;
1556         }
1557
1558         dep = dwc->eps[1];
1559         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
1560         if (ret) {
1561                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1562                 goto err3;
1563         }
1564
1565         /* begin to receive SETUP packets */
1566         dwc->ep0state = EP0_SETUP_PHASE;
1567         dwc3_ep0_out_start(dwc);
1568
1569         dwc3_gadget_enable_irq(dwc);
1570
1571         spin_unlock_irqrestore(&dwc->lock, flags);
1572
1573         return 0;
1574
1575 err3:
1576         __dwc3_gadget_ep_disable(dwc->eps[0]);
1577
1578 err2:
1579         dwc->gadget_driver = NULL;
1580
1581 err1:
1582         spin_unlock_irqrestore(&dwc->lock, flags);
1583
1584         free_irq(irq, dwc);
1585
1586 err0:
1587         return ret;
1588 }
1589
1590 static int dwc3_gadget_stop(struct usb_gadget *g,
1591                 struct usb_gadget_driver *driver)
1592 {
1593         struct dwc3             *dwc = gadget_to_dwc(g);
1594         unsigned long           flags;
1595         int                     irq;
1596
1597         spin_lock_irqsave(&dwc->lock, flags);
1598
1599         dwc3_gadget_disable_irq(dwc);
1600         __dwc3_gadget_ep_disable(dwc->eps[0]);
1601         __dwc3_gadget_ep_disable(dwc->eps[1]);
1602
1603         dwc->gadget_driver      = NULL;
1604
1605         spin_unlock_irqrestore(&dwc->lock, flags);
1606
1607         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1608         free_irq(irq, dwc);
1609
1610         return 0;
1611 }
1612
1613 static const struct usb_gadget_ops dwc3_gadget_ops = {
1614         .get_frame              = dwc3_gadget_get_frame,
1615         .wakeup                 = dwc3_gadget_wakeup,
1616         .set_selfpowered        = dwc3_gadget_set_selfpowered,
1617         .pullup                 = dwc3_gadget_pullup,
1618         .udc_start              = dwc3_gadget_start,
1619         .udc_stop               = dwc3_gadget_stop,
1620 };
1621
1622 /* -------------------------------------------------------------------------- */
1623
1624 static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1625                 u8 num, u32 direction)
1626 {
1627         struct dwc3_ep                  *dep;
1628         u8                              i;
1629
1630         for (i = 0; i < num; i++) {
1631                 u8 epnum = (i << 1) | (!!direction);
1632
1633                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1634                 if (!dep) {
1635                         dev_err(dwc->dev, "can't allocate endpoint %d\n",
1636                                         epnum);
1637                         return -ENOMEM;
1638                 }
1639
1640                 dep->dwc = dwc;
1641                 dep->number = epnum;
1642                 dep->direction = !!direction;
1643                 dwc->eps[epnum] = dep;
1644
1645                 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1646                                 (epnum & 1) ? "in" : "out");
1647
1648                 dep->endpoint.name = dep->name;
1649
1650                 dev_vdbg(dwc->dev, "initializing %s\n", dep->name);
1651
1652                 if (epnum == 0 || epnum == 1) {
1653                         dep->endpoint.maxpacket = 512;
1654                         dep->endpoint.maxburst = 1;
1655                         dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1656                         if (!epnum)
1657                                 dwc->gadget.ep0 = &dep->endpoint;
1658                 } else {
1659                         int             ret;
1660
1661                         dep->endpoint.maxpacket = 1024;
1662                         dep->endpoint.max_streams = 15;
1663                         dep->endpoint.ops = &dwc3_gadget_ep_ops;
1664                         list_add_tail(&dep->endpoint.ep_list,
1665                                         &dwc->gadget.ep_list);
1666
1667                         ret = dwc3_alloc_trb_pool(dep);
1668                         if (ret)
1669                                 return ret;
1670                 }
1671
1672                 INIT_LIST_HEAD(&dep->request_list);
1673                 INIT_LIST_HEAD(&dep->req_queued);
1674         }
1675
1676         return 0;
1677 }
1678
1679 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1680 {
1681         int                             ret;
1682
1683         INIT_LIST_HEAD(&dwc->gadget.ep_list);
1684
1685         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1686         if (ret < 0) {
1687                 dev_vdbg(dwc->dev, "failed to allocate OUT endpoints\n");
1688                 return ret;
1689         }
1690
1691         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1692         if (ret < 0) {
1693                 dev_vdbg(dwc->dev, "failed to allocate IN endpoints\n");
1694                 return ret;
1695         }
1696
1697         return 0;
1698 }
1699
1700 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1701 {
1702         struct dwc3_ep                  *dep;
1703         u8                              epnum;
1704
1705         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1706                 dep = dwc->eps[epnum];
1707                 if (!dep)
1708                         continue;
1709                 /*
1710                  * Physical endpoints 0 and 1 are special; they form the
1711                  * bi-directional USB endpoint 0.
1712                  *
1713                  * For those two physical endpoints, we don't allocate a TRB
1714                  * pool nor do we add them the endpoints list. Due to that, we
1715                  * shouldn't do these two operations otherwise we would end up
1716                  * with all sorts of bugs when removing dwc3.ko.
1717                  */
1718                 if (epnum != 0 && epnum != 1) {
1719                         dwc3_free_trb_pool(dep);
1720                         list_del(&dep->endpoint.ep_list);
1721                 }
1722
1723                 kfree(dep);
1724         }
1725 }
1726
1727 /* -------------------------------------------------------------------------- */
1728
1729 static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
1730                 struct dwc3_request *req, struct dwc3_trb *trb,
1731                 const struct dwc3_event_depevt *event, int status)
1732 {
1733         unsigned int            count;
1734         unsigned int            s_pkt = 0;
1735         unsigned int            trb_status;
1736
1737         if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
1738                 /*
1739                  * We continue despite the error. There is not much we
1740                  * can do. If we don't clean it up we loop forever. If
1741                  * we skip the TRB then it gets overwritten after a
1742                  * while since we use them in a ring buffer. A BUG()
1743                  * would help. Lets hope that if this occurs, someone
1744                  * fixes the root cause instead of looking away :)
1745                  */
1746                 dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1747                                 dep->name, trb);
1748         count = trb->size & DWC3_TRB_SIZE_MASK;
1749
1750         if (dep->direction) {
1751                 if (count) {
1752                         trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
1753                         if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
1754                                 dev_dbg(dwc->dev, "incomplete IN transfer %s\n",
1755                                                 dep->name);
1756                                 /*
1757                                  * If missed isoc occurred and there is
1758                                  * no request queued then issue END
1759                                  * TRANSFER, so that core generates
1760                                  * next xfernotready and we will issue
1761                                  * a fresh START TRANSFER.
1762                                  * If there are still queued request
1763                                  * then wait, do not issue either END
1764                                  * or UPDATE TRANSFER, just attach next
1765                                  * request in request_list during
1766                                  * giveback.If any future queued request
1767                                  * is successfully transferred then we
1768                                  * will issue UPDATE TRANSFER for all
1769                                  * request in the request_list.
1770                                  */
1771                                 dep->flags |= DWC3_EP_MISSED_ISOC;
1772                         } else {
1773                                 dev_err(dwc->dev, "incomplete IN transfer %s\n",
1774                                                 dep->name);
1775                                 status = -ECONNRESET;
1776                         }
1777                 } else {
1778                         dep->flags &= ~DWC3_EP_MISSED_ISOC;
1779                 }
1780         } else {
1781                 if (count && (event->status & DEPEVT_STATUS_SHORT))
1782                         s_pkt = 1;
1783         }
1784
1785         /*
1786          * We assume here we will always receive the entire data block
1787          * which we should receive. Meaning, if we program RX to
1788          * receive 4K but we receive only 2K, we assume that's all we
1789          * should receive and we simply bounce the request back to the
1790          * gadget driver for further processing.
1791          */
1792         req->request.actual += req->request.length - count;
1793         if (s_pkt)
1794                 return 1;
1795         if ((event->status & DEPEVT_STATUS_LST) &&
1796                         (trb->ctrl & (DWC3_TRB_CTRL_LST |
1797                                 DWC3_TRB_CTRL_HWO)))
1798                 return 1;
1799         if ((event->status & DEPEVT_STATUS_IOC) &&
1800                         (trb->ctrl & DWC3_TRB_CTRL_IOC))
1801                 return 1;
1802         return 0;
1803 }
1804
1805 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1806                 const struct dwc3_event_depevt *event, int status)
1807 {
1808         struct dwc3_request     *req;
1809         struct dwc3_trb         *trb;
1810         unsigned int            slot;
1811         unsigned int            i;
1812         int                     ret;
1813
1814         do {
1815                 req = next_request(&dep->req_queued);
1816                 if (!req) {
1817                         WARN_ON_ONCE(1);
1818                         return 1;
1819                 }
1820                 i = 0;
1821                 do {
1822                         slot = req->start_slot + i;
1823                         if ((slot == DWC3_TRB_NUM - 1) &&
1824                                 usb_endpoint_xfer_isoc(dep->endpoint.desc))
1825                                 slot++;
1826                         slot %= DWC3_TRB_NUM;
1827                         trb = &dep->trb_pool[slot];
1828
1829                         ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
1830                                         event, status);
1831                         if (ret)
1832                                 break;
1833                 }while (++i < req->request.num_mapped_sgs);
1834
1835                 dwc3_gadget_giveback(dep, req, status);
1836
1837                 if (ret)
1838                         break;
1839         } while (1);
1840
1841         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1842                         list_empty(&dep->req_queued)) {
1843                 if (list_empty(&dep->request_list)) {
1844                         /*
1845                          * If there is no entry in request list then do
1846                          * not issue END TRANSFER now. Just set PENDING
1847                          * flag, so that END TRANSFER is issued when an
1848                          * entry is added into request list.
1849                          */
1850                         dep->flags = DWC3_EP_PENDING_REQUEST;
1851                 } else {
1852                         dwc3_stop_active_transfer(dwc, dep->number);
1853                         dep->flags = DWC3_EP_ENABLED;
1854                 }
1855                 return 1;
1856         }
1857
1858         if ((event->status & DEPEVT_STATUS_IOC) &&
1859                         (trb->ctrl & DWC3_TRB_CTRL_IOC))
1860                 return 0;
1861         return 1;
1862 }
1863
1864 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
1865                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event,
1866                 int start_new)
1867 {
1868         unsigned                status = 0;
1869         int                     clean_busy;
1870
1871         if (event->status & DEPEVT_STATUS_BUSERR)
1872                 status = -ECONNRESET;
1873
1874         clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
1875         if (clean_busy)
1876                 dep->flags &= ~DWC3_EP_BUSY;
1877
1878         /*
1879          * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
1880          * See dwc3_gadget_linksts_change_interrupt() for 1st half.
1881          */
1882         if (dwc->revision < DWC3_REVISION_183A) {
1883                 u32             reg;
1884                 int             i;
1885
1886                 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
1887                         dep = dwc->eps[i];
1888
1889                         if (!(dep->flags & DWC3_EP_ENABLED))
1890                                 continue;
1891
1892                         if (!list_empty(&dep->req_queued))
1893                                 return;
1894                 }
1895
1896                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1897                 reg |= dwc->u1u2;
1898                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1899
1900                 dwc->u1u2 = 0;
1901         }
1902 }
1903
1904 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
1905                 const struct dwc3_event_depevt *event)
1906 {
1907         struct dwc3_ep          *dep;
1908         u8                      epnum = event->endpoint_number;
1909
1910         dep = dwc->eps[epnum];
1911
1912         if (!(dep->flags & DWC3_EP_ENABLED))
1913                 return;
1914
1915         dev_vdbg(dwc->dev, "%s: %s\n", dep->name,
1916                         dwc3_ep_event_string(event->endpoint_event));
1917
1918         if (epnum == 0 || epnum == 1) {
1919                 dwc3_ep0_interrupt(dwc, event);
1920                 return;
1921         }
1922
1923         switch (event->endpoint_event) {
1924         case DWC3_DEPEVT_XFERCOMPLETE:
1925                 dep->resource_index = 0;
1926
1927                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1928                         dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n",
1929                                         dep->name);
1930                         return;
1931                 }
1932
1933                 dwc3_endpoint_transfer_complete(dwc, dep, event, 1);
1934                 break;
1935         case DWC3_DEPEVT_XFERINPROGRESS:
1936                 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1937                         dev_dbg(dwc->dev, "%s is not an Isochronous endpoint\n",
1938                                         dep->name);
1939                         return;
1940                 }
1941
1942                 dwc3_endpoint_transfer_complete(dwc, dep, event, 0);
1943                 break;
1944         case DWC3_DEPEVT_XFERNOTREADY:
1945                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1946                         dwc3_gadget_start_isoc(dwc, dep, event);
1947                 } else {
1948                         int ret;
1949
1950                         dev_vdbg(dwc->dev, "%s: reason %s\n",
1951                                         dep->name, event->status &
1952                                         DEPEVT_STATUS_TRANSFER_ACTIVE
1953                                         ? "Transfer Active"
1954                                         : "Transfer Not Active");
1955
1956                         ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
1957                         if (!ret || ret == -EBUSY)
1958                                 return;
1959
1960                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1961                                         dep->name);
1962                 }
1963
1964                 break;
1965         case DWC3_DEPEVT_STREAMEVT:
1966                 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
1967                         dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
1968                                         dep->name);
1969                         return;
1970                 }
1971
1972                 switch (event->status) {
1973                 case DEPEVT_STREAMEVT_FOUND:
1974                         dev_vdbg(dwc->dev, "Stream %d found and started\n",
1975                                         event->parameters);
1976
1977                         break;
1978                 case DEPEVT_STREAMEVT_NOTFOUND:
1979                         /* FALLTHROUGH */
1980                 default:
1981                         dev_dbg(dwc->dev, "Couldn't find suitable stream\n");
1982                 }
1983                 break;
1984         case DWC3_DEPEVT_RXTXFIFOEVT:
1985                 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name);
1986                 break;
1987         case DWC3_DEPEVT_EPCMDCMPLT:
1988                 dev_vdbg(dwc->dev, "Endpoint Command Complete\n");
1989                 break;
1990         }
1991 }
1992
1993 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
1994 {
1995         if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
1996                 spin_unlock(&dwc->lock);
1997                 dwc->gadget_driver->disconnect(&dwc->gadget);
1998                 spin_lock(&dwc->lock);
1999         }
2000 }
2001
2002 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum)
2003 {
2004         struct dwc3_ep *dep;
2005         struct dwc3_gadget_ep_cmd_params params;
2006         u32 cmd;
2007         int ret;
2008
2009         dep = dwc->eps[epnum];
2010
2011         if (!dep->resource_index)
2012                 return;
2013
2014         /*
2015          * NOTICE: We are violating what the Databook says about the
2016          * EndTransfer command. Ideally we would _always_ wait for the
2017          * EndTransfer Command Completion IRQ, but that's causing too
2018          * much trouble synchronizing between us and gadget driver.
2019          *
2020          * We have discussed this with the IP Provider and it was
2021          * suggested to giveback all requests here, but give HW some
2022          * extra time to synchronize with the interconnect. We're using
2023          * an arbitraty 100us delay for that.
2024          *
2025          * Note also that a similar handling was tested by Synopsys
2026          * (thanks a lot Paul) and nothing bad has come out of it.
2027          * In short, what we're doing is:
2028          *
2029          * - Issue EndTransfer WITH CMDIOC bit set
2030          * - Wait 100us
2031          */
2032
2033         cmd = DWC3_DEPCMD_ENDTRANSFER;
2034         cmd |= DWC3_DEPCMD_HIPRI_FORCERM | DWC3_DEPCMD_CMDIOC;
2035         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
2036         memset(&params, 0, sizeof(params));
2037         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
2038         WARN_ON_ONCE(ret);
2039         dep->resource_index = 0;
2040         dep->flags &= ~DWC3_EP_BUSY;
2041         udelay(100);
2042 }
2043
2044 static void dwc3_stop_active_transfers(struct dwc3 *dwc)
2045 {
2046         u32 epnum;
2047
2048         for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2049                 struct dwc3_ep *dep;
2050
2051                 dep = dwc->eps[epnum];
2052                 if (!dep)
2053                         continue;
2054
2055                 if (!(dep->flags & DWC3_EP_ENABLED))
2056                         continue;
2057
2058                 dwc3_remove_requests(dwc, dep);
2059         }
2060 }
2061
2062 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2063 {
2064         u32 epnum;
2065
2066         for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2067                 struct dwc3_ep *dep;
2068                 struct dwc3_gadget_ep_cmd_params params;
2069                 int ret;
2070
2071                 dep = dwc->eps[epnum];
2072                 if (!dep)
2073                         continue;
2074
2075                 if (!(dep->flags & DWC3_EP_STALL))
2076                         continue;
2077
2078                 dep->flags &= ~DWC3_EP_STALL;
2079
2080                 memset(&params, 0, sizeof(params));
2081                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
2082                                 DWC3_DEPCMD_CLEARSTALL, &params);
2083                 WARN_ON_ONCE(ret);
2084         }
2085 }
2086
2087 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2088 {
2089         int                     reg;
2090
2091         dev_vdbg(dwc->dev, "%s\n", __func__);
2092
2093         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2094         reg &= ~DWC3_DCTL_INITU1ENA;
2095         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2096
2097         reg &= ~DWC3_DCTL_INITU2ENA;
2098         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2099
2100         dwc3_disconnect_gadget(dwc);
2101         dwc->start_config_issued = false;
2102
2103         dwc->gadget.speed = USB_SPEED_UNKNOWN;
2104         dwc->setup_packet_pending = false;
2105 }
2106
2107 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2108 {
2109         u32                     reg;
2110
2111         dev_vdbg(dwc->dev, "%s\n", __func__);
2112
2113         /*
2114          * WORKAROUND: DWC3 revisions <1.88a have an issue which
2115          * would cause a missing Disconnect Event if there's a
2116          * pending Setup Packet in the FIFO.
2117          *
2118          * There's no suggested workaround on the official Bug
2119          * report, which states that "unless the driver/application
2120          * is doing any special handling of a disconnect event,
2121          * there is no functional issue".
2122          *
2123          * Unfortunately, it turns out that we _do_ some special
2124          * handling of a disconnect event, namely complete all
2125          * pending transfers, notify gadget driver of the
2126          * disconnection, and so on.
2127          *
2128          * Our suggested workaround is to follow the Disconnect
2129          * Event steps here, instead, based on a setup_packet_pending
2130          * flag. Such flag gets set whenever we have a XferNotReady
2131          * event on EP0 and gets cleared on XferComplete for the
2132          * same endpoint.
2133          *
2134          * Refers to:
2135          *
2136          * STAR#9000466709: RTL: Device : Disconnect event not
2137          * generated if setup packet pending in FIFO
2138          */
2139         if (dwc->revision < DWC3_REVISION_188A) {
2140                 if (dwc->setup_packet_pending)
2141                         dwc3_gadget_disconnect_interrupt(dwc);
2142         }
2143
2144         /* after reset -> Default State */
2145         usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
2146
2147         if (dwc->gadget.speed != USB_SPEED_UNKNOWN)
2148                 dwc3_disconnect_gadget(dwc);
2149
2150         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2151         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2152         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2153         dwc->test_mode = false;
2154
2155         dwc3_stop_active_transfers(dwc);
2156         dwc3_clear_stall_all_ep(dwc);
2157         dwc->start_config_issued = false;
2158
2159         /* Reset device address to zero */
2160         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2161         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2162         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2163 }
2164
2165 static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
2166 {
2167         u32 reg;
2168         u32 usb30_clock = DWC3_GCTL_CLK_BUS;
2169
2170         /*
2171          * We change the clock only at SS but I dunno why I would want to do
2172          * this. Maybe it becomes part of the power saving plan.
2173          */
2174
2175         if (speed != DWC3_DSTS_SUPERSPEED)
2176                 return;
2177
2178         /*
2179          * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2180          * each time on Connect Done.
2181          */
2182         if (!usb30_clock)
2183                 return;
2184
2185         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
2186         reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
2187         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
2188 }
2189
2190 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2191 {
2192         struct dwc3_ep          *dep;
2193         int                     ret;
2194         u32                     reg;
2195         u8                      speed;
2196
2197         dev_vdbg(dwc->dev, "%s\n", __func__);
2198
2199         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2200         speed = reg & DWC3_DSTS_CONNECTSPD;
2201         dwc->speed = speed;
2202
2203         dwc3_update_ram_clk_sel(dwc, speed);
2204
2205         switch (speed) {
2206         case DWC3_DCFG_SUPERSPEED:
2207                 /*
2208                  * WORKAROUND: DWC3 revisions <1.90a have an issue which
2209                  * would cause a missing USB3 Reset event.
2210                  *
2211                  * In such situations, we should force a USB3 Reset
2212                  * event by calling our dwc3_gadget_reset_interrupt()
2213                  * routine.
2214                  *
2215                  * Refers to:
2216                  *
2217                  * STAR#9000483510: RTL: SS : USB3 reset event may
2218                  * not be generated always when the link enters poll
2219                  */
2220                 if (dwc->revision < DWC3_REVISION_190A)
2221                         dwc3_gadget_reset_interrupt(dwc);
2222
2223                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2224                 dwc->gadget.ep0->maxpacket = 512;
2225                 dwc->gadget.speed = USB_SPEED_SUPER;
2226                 break;
2227         case DWC3_DCFG_HIGHSPEED:
2228                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2229                 dwc->gadget.ep0->maxpacket = 64;
2230                 dwc->gadget.speed = USB_SPEED_HIGH;
2231                 break;
2232         case DWC3_DCFG_FULLSPEED2:
2233         case DWC3_DCFG_FULLSPEED1:
2234                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2235                 dwc->gadget.ep0->maxpacket = 64;
2236                 dwc->gadget.speed = USB_SPEED_FULL;
2237                 break;
2238         case DWC3_DCFG_LOWSPEED:
2239                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2240                 dwc->gadget.ep0->maxpacket = 8;
2241                 dwc->gadget.speed = USB_SPEED_LOW;
2242                 break;
2243         }
2244
2245         /* Enable USB2 LPM Capability */
2246
2247         if ((dwc->revision > DWC3_REVISION_194A)
2248                         && (speed != DWC3_DCFG_SUPERSPEED)) {
2249                 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2250                 reg |= DWC3_DCFG_LPM_CAP;
2251                 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2252
2253                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2254                 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2255
2256                 /*
2257                  * TODO: This should be configurable. For now using
2258                  * maximum allowed HIRD threshold value of 0b1100
2259                  */
2260                 reg |= DWC3_DCTL_HIRD_THRES(12);
2261
2262                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2263         }
2264
2265         dep = dwc->eps[0];
2266         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true);
2267         if (ret) {
2268                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2269                 return;
2270         }
2271
2272         dep = dwc->eps[1];
2273         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true);
2274         if (ret) {
2275                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2276                 return;
2277         }
2278
2279         /*
2280          * Configure PHY via GUSB3PIPECTLn if required.
2281          *
2282          * Update GTXFIFOSIZn
2283          *
2284          * In both cases reset values should be sufficient.
2285          */
2286 }
2287
2288 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2289 {
2290         dev_vdbg(dwc->dev, "%s\n", __func__);
2291
2292         /*
2293          * TODO take core out of low power mode when that's
2294          * implemented.
2295          */
2296
2297         dwc->gadget_driver->resume(&dwc->gadget);
2298 }
2299
2300 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2301                 unsigned int evtinfo)
2302 {
2303         enum dwc3_link_state    next = evtinfo & DWC3_LINK_STATE_MASK;
2304         unsigned int            pwropt;
2305
2306         /*
2307          * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2308          * Hibernation mode enabled which would show up when device detects
2309          * host-initiated U3 exit.
2310          *
2311          * In that case, device will generate a Link State Change Interrupt
2312          * from U3 to RESUME which is only necessary if Hibernation is
2313          * configured in.
2314          *
2315          * There are no functional changes due to such spurious event and we
2316          * just need to ignore it.
2317          *
2318          * Refers to:
2319          *
2320          * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2321          * operational mode
2322          */
2323         pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
2324         if ((dwc->revision < DWC3_REVISION_250A) &&
2325                         (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
2326                 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
2327                                 (next == DWC3_LINK_STATE_RESUME)) {
2328                         dev_vdbg(dwc->dev, "ignoring transition U3 -> Resume\n");
2329                         return;
2330                 }
2331         }
2332
2333         /*
2334          * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2335          * on the link partner, the USB session might do multiple entry/exit
2336          * of low power states before a transfer takes place.
2337          *
2338          * Due to this problem, we might experience lower throughput. The
2339          * suggested workaround is to disable DCTL[12:9] bits if we're
2340          * transitioning from U1/U2 to U0 and enable those bits again
2341          * after a transfer completes and there are no pending transfers
2342          * on any of the enabled endpoints.
2343          *
2344          * This is the first half of that workaround.
2345          *
2346          * Refers to:
2347          *
2348          * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2349          * core send LGO_Ux entering U0
2350          */
2351         if (dwc->revision < DWC3_REVISION_183A) {
2352                 if (next == DWC3_LINK_STATE_U0) {
2353                         u32     u1u2;
2354                         u32     reg;
2355
2356                         switch (dwc->link_state) {
2357                         case DWC3_LINK_STATE_U1:
2358                         case DWC3_LINK_STATE_U2:
2359                                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2360                                 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2361                                                 | DWC3_DCTL_ACCEPTU2ENA
2362                                                 | DWC3_DCTL_INITU1ENA
2363                                                 | DWC3_DCTL_ACCEPTU1ENA);
2364
2365                                 if (!dwc->u1u2)
2366                                         dwc->u1u2 = reg & u1u2;
2367
2368                                 reg &= ~u1u2;
2369
2370                                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2371                                 break;
2372                         default:
2373                                 /* do nothing */
2374                                 break;
2375                         }
2376                 }
2377         }
2378
2379         dwc->link_state = next;
2380
2381         dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state);
2382 }
2383
2384 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2385                 const struct dwc3_event_devt *event)
2386 {
2387         switch (event->type) {
2388         case DWC3_DEVICE_EVENT_DISCONNECT:
2389                 dwc3_gadget_disconnect_interrupt(dwc);
2390                 break;
2391         case DWC3_DEVICE_EVENT_RESET:
2392                 dwc3_gadget_reset_interrupt(dwc);
2393                 break;
2394         case DWC3_DEVICE_EVENT_CONNECT_DONE:
2395                 dwc3_gadget_conndone_interrupt(dwc);
2396                 break;
2397         case DWC3_DEVICE_EVENT_WAKEUP:
2398                 dwc3_gadget_wakeup_interrupt(dwc);
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(dwc->dev, sizeof(*dwc->ctrl_req),
2562                         &dwc->ctrl_req_addr, GFP_KERNEL);
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(dwc->dev, sizeof(*dwc->ep0_trb),
2570                         &dwc->ep0_trb_addr, GFP_KERNEL);
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 = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
2578         if (!dwc->setup_buf) {
2579                 dev_err(dwc->dev, "failed to allocate setup buffer\n");
2580                 ret = -ENOMEM;
2581                 goto err2;
2582         }
2583
2584         dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
2585                         DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
2586                         GFP_KERNEL);
2587         if (!dwc->ep0_bounce) {
2588                 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
2589                 ret = -ENOMEM;
2590                 goto err3;
2591         }
2592
2593         dwc->gadget.ops                 = &dwc3_gadget_ops;
2594         dwc->gadget.max_speed           = USB_SPEED_SUPER;
2595         dwc->gadget.speed               = USB_SPEED_UNKNOWN;
2596         dwc->gadget.sg_supported        = true;
2597         dwc->gadget.name                = "dwc3-gadget";
2598
2599         /*
2600          * REVISIT: Here we should clear all pending IRQs to be
2601          * sure we're starting from a well known location.
2602          */
2603
2604         ret = dwc3_gadget_init_endpoints(dwc);
2605         if (ret)
2606                 goto err4;
2607
2608         ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
2609         if (ret) {
2610                 dev_err(dwc->dev, "failed to register udc\n");
2611                 goto err4;
2612         }
2613
2614         return 0;
2615
2616 err4:
2617         dwc3_gadget_free_endpoints(dwc);
2618         dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2619                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
2620
2621 err3:
2622         kfree(dwc->setup_buf);
2623
2624 err2:
2625         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2626                         dwc->ep0_trb, dwc->ep0_trb_addr);
2627
2628 err1:
2629         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2630                         dwc->ctrl_req, dwc->ctrl_req_addr);
2631
2632 err0:
2633         return ret;
2634 }
2635
2636 /* -------------------------------------------------------------------------- */
2637
2638 void dwc3_gadget_exit(struct dwc3 *dwc)
2639 {
2640         usb_del_gadget_udc(&dwc->gadget);
2641
2642         dwc3_gadget_free_endpoints(dwc);
2643
2644         dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2645                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
2646
2647         kfree(dwc->setup_buf);
2648
2649         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2650                         dwc->ep0_trb, dwc->ep0_trb_addr);
2651
2652         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2653                         dwc->ctrl_req, dwc->ctrl_req_addr);
2654 }
2655
2656 int dwc3_gadget_prepare(struct dwc3 *dwc)
2657 {
2658         if (dwc->pullups_connected)
2659                 dwc3_gadget_disable_irq(dwc);
2660
2661         return 0;
2662 }
2663
2664 void dwc3_gadget_complete(struct dwc3 *dwc)
2665 {
2666         if (dwc->pullups_connected) {
2667                 dwc3_gadget_enable_irq(dwc);
2668                 dwc3_gadget_run_stop(dwc, true);
2669         }
2670 }
2671
2672 int dwc3_gadget_suspend(struct dwc3 *dwc)
2673 {
2674         __dwc3_gadget_ep_disable(dwc->eps[0]);
2675         __dwc3_gadget_ep_disable(dwc->eps[1]);
2676
2677         dwc->dcfg = dwc3_readl(dwc->regs, DWC3_DCFG);
2678
2679         return 0;
2680 }
2681
2682 int dwc3_gadget_resume(struct dwc3 *dwc)
2683 {
2684         struct dwc3_ep          *dep;
2685         int                     ret;
2686
2687         /* Start with SuperSpeed Default */
2688         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2689
2690         dep = dwc->eps[0];
2691         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
2692         if (ret)
2693                 goto err0;
2694
2695         dep = dwc->eps[1];
2696         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
2697         if (ret)
2698                 goto err1;
2699
2700         /* begin to receive SETUP packets */
2701         dwc->ep0state = EP0_SETUP_PHASE;
2702         dwc3_ep0_out_start(dwc);
2703
2704         dwc3_writel(dwc->regs, DWC3_DCFG, dwc->dcfg);
2705
2706         return 0;
2707
2708 err1:
2709         __dwc3_gadget_ep_disable(dwc->eps[0]);
2710
2711 err0:
2712         return ret;
2713 }