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         if (!(dep->flags & DWC3_EP_ENABLED)) {
 504                 ret = dwc3_gadget_start_config(dwc, dep);
 505                 if (ret)
 506                         return ret;
 507         }
 508
 509         ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore);
 510         if (ret)
 511                 return ret;
 512
 513         if (!(dep->flags & DWC3_EP_ENABLED)) {
 514                 struct dwc3_trb *trb_st_hw;
 515                 struct dwc3_trb *trb_link;
 516
 517                 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
 518                 if (ret)
 519                         return ret;
 520
 521                 dep->endpoint.desc = desc;
 522                 dep->comp_desc = comp_desc;
 523                 dep->type = usb_endpoint_type(desc);
 524                 dep->flags |= DWC3_EP_ENABLED;
 525
 526                 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 527                 reg |= DWC3_DALEPENA_EP(dep->number);
 528                 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 529
 530                 if (!usb_endpoint_xfer_isoc(desc))
 531                         return 0;
 532
 533                 memset(&trb_link, 0, sizeof(trb_link));
 534
 535                 /* Link TRB for ISOC. The HWO bit is never reset */
 536                 trb_st_hw = &dep->trb_pool[0];
 537
 538                 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
 539
 540                 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 541                 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 542                 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
 543                 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
 544         }
 545
 546         return 0;
 547 }
 548
 549 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum);
 550 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 551 {
 552         struct dwc3_request             *req;
 553
 554         if (!list_empty(&dep->req_queued)) {
 555                 dwc3_stop_active_transfer(dwc, dep->number);
 556
 557                 /* - giveback all requests to gadget driver */
 558                 while (!list_empty(&dep->req_queued)) {
 559                         req = next_request(&dep->req_queued);
 560
 561                         dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 562                 }
 563         }
 564
 565         while (!list_empty(&dep->request_list)) {
 566                 req = next_request(&dep->request_list);
 567
 568                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 569         }
 570 }
 571
 572 /**
 573  * __dwc3_gadget_ep_disable - Disables a HW endpoint
 574  * @dep: the endpoint to disable
 575  *
 576  * This function also removes requests which are currently processed ny the
 577  * hardware and those which are not yet scheduled.
 578  * Caller should take care of locking.
 579  */
 580 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
 581 {
 582         struct dwc3             *dwc = dep->dwc;
 583         u32                     reg;
 584
 585         dwc3_remove_requests(dwc, dep);
 586
 587         reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 588         reg &= ~DWC3_DALEPENA_EP(dep->number);
 589         dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 590
 591         dep->stream_capable = false;
 592         dep->endpoint.desc = NULL;
 593         dep->comp_desc = NULL;
 594         dep->type = 0;
 595         dep->flags = 0;
 596
 597         return 0;
 598 }
 599
 600 /* -------------------------------------------------------------------------- */
 601
 602 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
 603                 const struct usb_endpoint_descriptor *desc)
 604 {
 605         return -EINVAL;
 606 }
 607
 608 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
 609 {
 610         return -EINVAL;
 611 }
 612
 613 /* -------------------------------------------------------------------------- */
 614
 615 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
 616                 const struct usb_endpoint_descriptor *desc)
 617 {
 618         struct dwc3_ep                  *dep;
 619         struct dwc3                     *dwc;
 620         unsigned long                   flags;
 621         int                             ret;
 622
 623         if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
 624                 pr_debug("dwc3: invalid parameters\n");
 625                 return -EINVAL;
 626         }
 627
 628         if (!desc->wMaxPacketSize) {
 629                 pr_debug("dwc3: missing wMaxPacketSize\n");
 630                 return -EINVAL;
 631         }
 632
 633         dep = to_dwc3_ep(ep);
 634         dwc = dep->dwc;
 635
 636         if (dep->flags & DWC3_EP_ENABLED) {
 637                 dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n",
 638                                 dep->name);
 639                 return 0;
 640         }
 641
 642         switch (usb_endpoint_type(desc)) {
 643         case USB_ENDPOINT_XFER_CONTROL:
 644                 strlcat(dep->name, "-control", sizeof(dep->name));
 645                 break;
 646         case USB_ENDPOINT_XFER_ISOC:
 647                 strlcat(dep->name, "-isoc", sizeof(dep->name));
 648                 break;
 649         case USB_ENDPOINT_XFER_BULK:
 650                 strlcat(dep->name, "-bulk", sizeof(dep->name));
 651                 break;
 652         case USB_ENDPOINT_XFER_INT:
 653                 strlcat(dep->name, "-int", sizeof(dep->name));
 654                 break;
 655         default:
 656                 dev_err(dwc->dev, "invalid endpoint transfer type\n");
 657         }
 658
 659         dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);
 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                 if (dep->flags & DWC3_EP_WEDGE)
1204                         return 0;
1205
1206                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1207                         DWC3_DEPCMD_CLEARSTALL, &params);
1208                 if (ret)
1209                         dev_err(dwc->dev, "failed to %s STALL on %s\n",
1210                                         value ? "set" : "clear",
1211                                         dep->name);
1212                 else
1213                         dep->flags &= ~DWC3_EP_STALL;
1214         }
1215
1216         return ret;
1217 }
1218
1219 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1220 {
1221         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1222         struct dwc3                     *dwc = dep->dwc;
1223
1224         unsigned long                   flags;
1225
1226         int                             ret;
1227
1228         spin_lock_irqsave(&dwc->lock, flags);
1229
1230         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1231                 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1232                 ret = -EINVAL;
1233                 goto out;
1234         }
1235
1236         ret = __dwc3_gadget_ep_set_halt(dep, value);
1237 out:
1238         spin_unlock_irqrestore(&dwc->lock, flags);
1239
1240         return ret;
1241 }
1242
1243 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1244 {
1245         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1246         struct dwc3                     *dwc = dep->dwc;
1247         unsigned long                   flags;
1248
1249         spin_lock_irqsave(&dwc->lock, flags);
1250         dep->flags |= DWC3_EP_WEDGE;
1251         spin_unlock_irqrestore(&dwc->lock, flags);
1252
1253         if (dep->number == 0 || dep->number == 1)
1254                 return dwc3_gadget_ep0_set_halt(ep, 1);
1255         else
1256                 return dwc3_gadget_ep_set_halt(ep, 1);
1257 }
1258
1259 /* -------------------------------------------------------------------------- */
1260
1261 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1262         .bLength        = USB_DT_ENDPOINT_SIZE,
1263         .bDescriptorType = USB_DT_ENDPOINT,
1264         .bmAttributes   = USB_ENDPOINT_XFER_CONTROL,
1265 };
1266
1267 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1268         .enable         = dwc3_gadget_ep0_enable,
1269         .disable        = dwc3_gadget_ep0_disable,
1270         .alloc_request  = dwc3_gadget_ep_alloc_request,
1271         .free_request   = dwc3_gadget_ep_free_request,
1272         .queue          = dwc3_gadget_ep0_queue,
1273         .dequeue        = dwc3_gadget_ep_dequeue,
1274         .set_halt       = dwc3_gadget_ep0_set_halt,
1275         .set_wedge      = dwc3_gadget_ep_set_wedge,
1276 };
1277
1278 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1279         .enable         = dwc3_gadget_ep_enable,
1280         .disable        = dwc3_gadget_ep_disable,
1281         .alloc_request  = dwc3_gadget_ep_alloc_request,
1282         .free_request   = dwc3_gadget_ep_free_request,
1283         .queue          = dwc3_gadget_ep_queue,
1284         .dequeue        = dwc3_gadget_ep_dequeue,
1285         .set_halt       = dwc3_gadget_ep_set_halt,
1286         .set_wedge      = dwc3_gadget_ep_set_wedge,
1287 };
1288
1289 /* -------------------------------------------------------------------------- */
1290
1291 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1292 {
1293         struct dwc3             *dwc = gadget_to_dwc(g);
1294         u32                     reg;
1295
1296         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1297         return DWC3_DSTS_SOFFN(reg);
1298 }
1299
1300 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1301 {
1302         struct dwc3             *dwc = gadget_to_dwc(g);
1303
1304         unsigned long           timeout;
1305         unsigned long           flags;
1306
1307         u32                     reg;
1308
1309         int                     ret = 0;
1310
1311         u8                      link_state;
1312         u8                      speed;
1313
1314         spin_lock_irqsave(&dwc->lock, flags);
1315
1316         /*
1317          * According to the Databook Remote wakeup request should
1318          * be issued only when the device is in early suspend state.
1319          *
1320          * We can check that via USB Link State bits in DSTS register.
1321          */
1322         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1323
1324         speed = reg & DWC3_DSTS_CONNECTSPD;
1325         if (speed == DWC3_DSTS_SUPERSPEED) {
1326                 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n");
1327                 ret = -EINVAL;
1328                 goto out;
1329         }
1330
1331         link_state = DWC3_DSTS_USBLNKST(reg);
1332
1333         switch (link_state) {
1334         case DWC3_LINK_STATE_RX_DET:    /* in HS, means Early Suspend */
1335         case DWC3_LINK_STATE_U3:        /* in HS, means SUSPEND */
1336                 break;
1337         default:
1338                 dev_dbg(dwc->dev, "can't wakeup from link state %d\n",
1339                                 link_state);
1340                 ret = -EINVAL;
1341                 goto out;
1342         }
1343
1344         ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1345         if (ret < 0) {
1346                 dev_err(dwc->dev, "failed to put link in Recovery\n");
1347                 goto out;
1348         }
1349
1350         /* Recent versions do this automatically */
1351         if (dwc->revision < DWC3_REVISION_194A) {
1352                 /* write zeroes to Link Change Request */
1353                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1354                 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1355                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1356         }
1357
1358         /* poll until Link State changes to ON */
1359         timeout = jiffies + msecs_to_jiffies(100);
1360
1361         while (!time_after(jiffies, timeout)) {
1362                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1363
1364                 /* in HS, means ON */
1365                 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1366                         break;
1367         }
1368
1369         if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1370                 dev_err(dwc->dev, "failed to send remote wakeup\n");
1371                 ret = -EINVAL;
1372         }
1373
1374 out:
1375         spin_unlock_irqrestore(&dwc->lock, flags);
1376
1377         return ret;
1378 }
1379
1380 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1381                 int is_selfpowered)
1382 {
1383         struct dwc3             *dwc = gadget_to_dwc(g);
1384         unsigned long           flags;
1385
1386         spin_lock_irqsave(&dwc->lock, flags);
1387         dwc->is_selfpowered = !!is_selfpowered;
1388         spin_unlock_irqrestore(&dwc->lock, flags);
1389
1390         return 0;
1391 }
1392
1393 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on)
1394 {
1395         u32                     reg;
1396         u32                     timeout = 500;
1397
1398         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1399         if (is_on) {
1400                 if (dwc->revision <= DWC3_REVISION_187A) {
1401                         reg &= ~DWC3_DCTL_TRGTULST_MASK;
1402                         reg |= DWC3_DCTL_TRGTULST_RX_DET;
1403                 }
1404
1405                 if (dwc->revision >= DWC3_REVISION_194A)
1406                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1407                 reg |= DWC3_DCTL_RUN_STOP;
1408                 dwc->pullups_connected = true;
1409         } else {
1410                 reg &= ~DWC3_DCTL_RUN_STOP;
1411                 dwc->pullups_connected = false;
1412         }
1413
1414         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1415
1416         do {
1417                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1418                 if (is_on) {
1419                         if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1420                                 break;
1421                 } else {
1422                         if (reg & DWC3_DSTS_DEVCTRLHLT)
1423                                 break;
1424                 }
1425                 timeout--;
1426                 if (!timeout)
1427                         return -ETIMEDOUT;
1428                 udelay(1);
1429         } while (1);
1430
1431         dev_vdbg(dwc->dev, "gadget %s data soft-%s\n",
1432                         dwc->gadget_driver
1433                         ? dwc->gadget_driver->function : "no-function",
1434                         is_on ? "connect" : "disconnect");
1435
1436         return 0;
1437 }
1438
1439 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1440 {
1441         struct dwc3             *dwc = gadget_to_dwc(g);
1442         unsigned long           flags;
1443         int                     ret;
1444
1445         is_on = !!is_on;
1446
1447         spin_lock_irqsave(&dwc->lock, flags);
1448         ret = dwc3_gadget_run_stop(dwc, is_on);
1449         spin_unlock_irqrestore(&dwc->lock, flags);
1450
1451         return ret;
1452 }
1453
1454 static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1455 {
1456         u32                     reg;
1457
1458         /* Enable all but Start and End of Frame IRQs */
1459         reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1460                         DWC3_DEVTEN_EVNTOVERFLOWEN |
1461                         DWC3_DEVTEN_CMDCMPLTEN |
1462                         DWC3_DEVTEN_ERRTICERREN |
1463                         DWC3_DEVTEN_WKUPEVTEN |
1464                         DWC3_DEVTEN_ULSTCNGEN |
1465                         DWC3_DEVTEN_CONNECTDONEEN |
1466                         DWC3_DEVTEN_USBRSTEN |
1467                         DWC3_DEVTEN_DISCONNEVTEN);
1468
1469         dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1470 }
1471
1472 static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1473 {
1474         /* mask all interrupts */
1475         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1476 }
1477
1478 static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1479 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1480
1481 static int dwc3_gadget_start(struct usb_gadget *g,
1482                 struct usb_gadget_driver *driver)
1483 {
1484         struct dwc3             *dwc = gadget_to_dwc(g);
1485         struct dwc3_ep          *dep;
1486         unsigned long           flags;
1487         int                     ret = 0;
1488         int                     irq;
1489         u32                     reg;
1490
1491         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1492         ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
1493                         IRQF_SHARED | IRQF_ONESHOT, "dwc3", dwc);
1494         if (ret) {
1495                 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
1496                                 irq, ret);
1497                 goto err0;
1498         }
1499
1500         spin_lock_irqsave(&dwc->lock, flags);
1501
1502         if (dwc->gadget_driver) {
1503                 dev_err(dwc->dev, "%s is already bound to %s\n",
1504                                 dwc->gadget.name,
1505                                 dwc->gadget_driver->driver.name);
1506                 ret = -EBUSY;
1507                 goto err1;
1508         }
1509
1510         dwc->gadget_driver      = driver;
1511
1512         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1513         reg &= ~(DWC3_DCFG_SPEED_MASK);
1514
1515         /**
1516          * WORKAROUND: DWC3 revision < 2.20a have an issue
1517          * which would cause metastability state on Run/Stop
1518          * bit if we try to force the IP to USB2-only mode.
1519          *
1520          * Because of that, we cannot configure the IP to any
1521          * speed other than the SuperSpeed
1522          *
1523          * Refers to:
1524          *
1525          * STAR#9000525659: Clock Domain Crossing on DCTL in
1526          * USB 2.0 Mode
1527          */
1528         if (dwc->revision < DWC3_REVISION_220A)
1529                 reg |= DWC3_DCFG_SUPERSPEED;
1530         else
1531                 reg |= dwc->maximum_speed;
1532         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1533
1534         dwc->start_config_issued = false;
1535
1536         /* Start with SuperSpeed Default */
1537         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1538
1539         dep = dwc->eps[0];
1540         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
1541         if (ret) {
1542                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1543                 goto err2;
1544         }
1545
1546         dep = dwc->eps[1];
1547         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
1548         if (ret) {
1549                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1550                 goto err3;
1551         }
1552
1553         /* begin to receive SETUP packets */
1554         dwc->ep0state = EP0_SETUP_PHASE;
1555         dwc3_ep0_out_start(dwc);
1556
1557         dwc3_gadget_enable_irq(dwc);
1558
1559         spin_unlock_irqrestore(&dwc->lock, flags);
1560
1561         return 0;
1562
1563 err3:
1564         __dwc3_gadget_ep_disable(dwc->eps[0]);
1565
1566 err2:
1567         dwc->gadget_driver = NULL;
1568
1569 err1:
1570         spin_unlock_irqrestore(&dwc->lock, flags);
1571
1572         free_irq(irq, dwc);
1573
1574 err0:
1575         return ret;
1576 }
1577
1578 static int dwc3_gadget_stop(struct usb_gadget *g,
1579                 struct usb_gadget_driver *driver)
1580 {
1581         struct dwc3             *dwc = gadget_to_dwc(g);
1582         unsigned long           flags;
1583         int                     irq;
1584
1585         spin_lock_irqsave(&dwc->lock, flags);
1586
1587         dwc3_gadget_disable_irq(dwc);
1588         __dwc3_gadget_ep_disable(dwc->eps[0]);
1589         __dwc3_gadget_ep_disable(dwc->eps[1]);
1590
1591         dwc->gadget_driver      = NULL;
1592
1593         spin_unlock_irqrestore(&dwc->lock, flags);
1594
1595         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1596         free_irq(irq, dwc);
1597
1598         return 0;
1599 }
1600
1601 static const struct usb_gadget_ops dwc3_gadget_ops = {
1602         .get_frame              = dwc3_gadget_get_frame,
1603         .wakeup                 = dwc3_gadget_wakeup,
1604         .set_selfpowered        = dwc3_gadget_set_selfpowered,
1605         .pullup                 = dwc3_gadget_pullup,
1606         .udc_start              = dwc3_gadget_start,
1607         .udc_stop               = dwc3_gadget_stop,
1608 };
1609
1610 /* -------------------------------------------------------------------------- */
1611
1612 static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1613                 u8 num, u32 direction)
1614 {
1615         struct dwc3_ep                  *dep;
1616         u8                              i;
1617
1618         for (i = 0; i < num; i++) {
1619                 u8 epnum = (i << 1) | (!!direction);
1620
1621                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1622                 if (!dep) {
1623                         dev_err(dwc->dev, "can't allocate endpoint %d\n",
1624                                         epnum);
1625                         return -ENOMEM;
1626                 }
1627
1628                 dep->dwc = dwc;
1629                 dep->number = epnum;
1630                 dwc->eps[epnum] = dep;
1631
1632                 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1633                                 (epnum & 1) ? "in" : "out");
1634
1635                 dep->endpoint.name = dep->name;
1636                 dep->direction = (epnum & 1);
1637
1638                 if (epnum == 0 || epnum == 1) {
1639                         dep->endpoint.maxpacket = 512;
1640                         dep->endpoint.maxburst = 1;
1641                         dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1642                         if (!epnum)
1643                                 dwc->gadget.ep0 = &dep->endpoint;
1644                 } else {
1645                         int             ret;
1646
1647                         dep->endpoint.maxpacket = 1024;
1648                         dep->endpoint.max_streams = 15;
1649                         dep->endpoint.ops = &dwc3_gadget_ep_ops;
1650                         list_add_tail(&dep->endpoint.ep_list,
1651                                         &dwc->gadget.ep_list);
1652
1653                         ret = dwc3_alloc_trb_pool(dep);
1654                         if (ret)
1655                                 return ret;
1656                 }
1657
1658                 INIT_LIST_HEAD(&dep->request_list);
1659                 INIT_LIST_HEAD(&dep->req_queued);
1660         }
1661
1662         return 0;
1663 }
1664
1665 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1666 {
1667         int                             ret;
1668
1669         INIT_LIST_HEAD(&dwc->gadget.ep_list);
1670
1671         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1672         if (ret < 0) {
1673                 dev_vdbg(dwc->dev, "failed to allocate OUT endpoints\n");
1674                 return ret;
1675         }
1676
1677         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1678         if (ret < 0) {
1679                 dev_vdbg(dwc->dev, "failed to allocate IN endpoints\n");
1680                 return ret;
1681         }
1682
1683         return 0;
1684 }
1685
1686 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1687 {
1688         struct dwc3_ep                  *dep;
1689         u8                              epnum;
1690
1691         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1692                 dep = dwc->eps[epnum];
1693                 if (!dep)
1694                         continue;
1695                 /*
1696                  * Physical endpoints 0 and 1 are special; they form the
1697                  * bi-directional USB endpoint 0.
1698                  *
1699                  * For those two physical endpoints, we don't allocate a TRB
1700                  * pool nor do we add them the endpoints list. Due to that, we
1701                  * shouldn't do these two operations otherwise we would end up
1702                  * with all sorts of bugs when removing dwc3.ko.
1703                  */
1704                 if (epnum != 0 && epnum != 1) {
1705                         dwc3_free_trb_pool(dep);
1706                         list_del(&dep->endpoint.ep_list);
1707                 }
1708
1709                 kfree(dep);
1710         }
1711 }
1712
1713 /* -------------------------------------------------------------------------- */
1714
1715 static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
1716                 struct dwc3_request *req, struct dwc3_trb *trb,
1717                 const struct dwc3_event_depevt *event, int status)
1718 {
1719         unsigned int            count;
1720         unsigned int            s_pkt = 0;
1721         unsigned int            trb_status;
1722
1723         if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
1724                 /*
1725                  * We continue despite the error. There is not much we
1726                  * can do. If we don't clean it up we loop forever. If
1727                  * we skip the TRB then it gets overwritten after a
1728                  * while since we use them in a ring buffer. A BUG()
1729                  * would help. Lets hope that if this occurs, someone
1730                  * fixes the root cause instead of looking away :)
1731                  */
1732                 dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1733                                 dep->name, trb);
1734         count = trb->size & DWC3_TRB_SIZE_MASK;
1735
1736         if (dep->direction) {
1737                 if (count) {
1738                         trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
1739                         if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
1740                                 dev_dbg(dwc->dev, "incomplete IN transfer %s\n",
1741                                                 dep->name);
1742                                 /*
1743                                  * If missed isoc occurred and there is
1744                                  * no request queued then issue END
1745                                  * TRANSFER, so that core generates
1746                                  * next xfernotready and we will issue
1747                                  * a fresh START TRANSFER.
1748                                  * If there are still queued request
1749                                  * then wait, do not issue either END
1750                                  * or UPDATE TRANSFER, just attach next
1751                                  * request in request_list during
1752                                  * giveback.If any future queued request
1753                                  * is successfully transferred then we
1754                                  * will issue UPDATE TRANSFER for all
1755                                  * request in the request_list.
1756                                  */
1757                                 dep->flags |= DWC3_EP_MISSED_ISOC;
1758                         } else {
1759                                 dev_err(dwc->dev, "incomplete IN transfer %s\n",
1760                                                 dep->name);
1761                                 status = -ECONNRESET;
1762                         }
1763                 } else {
1764                         dep->flags &= ~DWC3_EP_MISSED_ISOC;
1765                 }
1766         } else {
1767                 if (count && (event->status & DEPEVT_STATUS_SHORT))
1768                         s_pkt = 1;
1769         }
1770
1771         /*
1772          * We assume here we will always receive the entire data block
1773          * which we should receive. Meaning, if we program RX to
1774          * receive 4K but we receive only 2K, we assume that's all we
1775          * should receive and we simply bounce the request back to the
1776          * gadget driver for further processing.
1777          */
1778         req->request.actual += req->request.length - count;
1779         if (s_pkt)
1780                 return 1;
1781         if ((event->status & DEPEVT_STATUS_LST) &&
1782                         (trb->ctrl & (DWC3_TRB_CTRL_LST |
1783                                 DWC3_TRB_CTRL_HWO)))
1784                 return 1;
1785         if ((event->status & DEPEVT_STATUS_IOC) &&
1786                         (trb->ctrl & DWC3_TRB_CTRL_IOC))
1787                 return 1;
1788         return 0;
1789 }
1790
1791 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1792                 const struct dwc3_event_depevt *event, int status)
1793 {
1794         struct dwc3_request     *req;
1795         struct dwc3_trb         *trb;
1796         unsigned int            slot;
1797         unsigned int            i;
1798         int                     ret;
1799
1800         do {
1801                 req = next_request(&dep->req_queued);
1802                 if (!req) {
1803                         WARN_ON_ONCE(1);
1804                         return 1;
1805                 }
1806                 i = 0;
1807                 do {
1808                         slot = req->start_slot + i;
1809                         if ((slot == DWC3_TRB_NUM - 1) &&
1810                                 usb_endpoint_xfer_isoc(dep->endpoint.desc))
1811                                 slot++;
1812                         slot %= DWC3_TRB_NUM;
1813                         trb = &dep->trb_pool[slot];
1814
1815                         ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
1816                                         event, status);
1817                         if (ret)
1818                                 break;
1819                 }while (++i < req->request.num_mapped_sgs);
1820
1821                 dwc3_gadget_giveback(dep, req, status);
1822
1823                 if (ret)
1824                         break;
1825         } while (1);
1826
1827         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1828                         list_empty(&dep->req_queued)) {
1829                 if (list_empty(&dep->request_list)) {
1830                         /*
1831                          * If there is no entry in request list then do
1832                          * not issue END TRANSFER now. Just set PENDING
1833                          * flag, so that END TRANSFER is issued when an
1834                          * entry is added into request list.
1835                          */
1836                         dep->flags = DWC3_EP_PENDING_REQUEST;
1837                 } else {
1838                         dwc3_stop_active_transfer(dwc, dep->number);
1839                         dep->flags = DWC3_EP_ENABLED;
1840                 }
1841                 return 1;
1842         }
1843
1844         if ((event->status & DEPEVT_STATUS_IOC) &&
1845                         (trb->ctrl & DWC3_TRB_CTRL_IOC))
1846                 return 0;
1847         return 1;
1848 }
1849
1850 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
1851                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event,
1852                 int start_new)
1853 {
1854         unsigned                status = 0;
1855         int                     clean_busy;
1856
1857         if (event->status & DEPEVT_STATUS_BUSERR)
1858                 status = -ECONNRESET;
1859
1860         clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
1861         if (clean_busy)
1862                 dep->flags &= ~DWC3_EP_BUSY;
1863
1864         /*
1865          * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
1866          * See dwc3_gadget_linksts_change_interrupt() for 1st half.
1867          */
1868         if (dwc->revision < DWC3_REVISION_183A) {
1869                 u32             reg;
1870                 int             i;
1871
1872                 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
1873                         dep = dwc->eps[i];
1874
1875                         if (!(dep->flags & DWC3_EP_ENABLED))
1876                                 continue;
1877
1878                         if (!list_empty(&dep->req_queued))
1879                                 return;
1880                 }
1881
1882                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1883                 reg |= dwc->u1u2;
1884                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1885
1886                 dwc->u1u2 = 0;
1887         }
1888 }
1889
1890 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
1891                 const struct dwc3_event_depevt *event)
1892 {
1893         struct dwc3_ep          *dep;
1894         u8                      epnum = event->endpoint_number;
1895
1896         dep = dwc->eps[epnum];
1897
1898         if (!(dep->flags & DWC3_EP_ENABLED))
1899                 return;
1900
1901         dev_vdbg(dwc->dev, "%s: %s\n", dep->name,
1902                         dwc3_ep_event_string(event->endpoint_event));
1903
1904         if (epnum == 0 || epnum == 1) {
1905                 dwc3_ep0_interrupt(dwc, event);
1906                 return;
1907         }
1908
1909         switch (event->endpoint_event) {
1910         case DWC3_DEPEVT_XFERCOMPLETE:
1911                 dep->resource_index = 0;
1912
1913                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1914                         dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n",
1915                                         dep->name);
1916                         return;
1917                 }
1918
1919                 dwc3_endpoint_transfer_complete(dwc, dep, event, 1);
1920                 break;
1921         case DWC3_DEPEVT_XFERINPROGRESS:
1922                 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1923                         dev_dbg(dwc->dev, "%s is not an Isochronous endpoint\n",
1924                                         dep->name);
1925                         return;
1926                 }
1927
1928                 dwc3_endpoint_transfer_complete(dwc, dep, event, 0);
1929                 break;
1930         case DWC3_DEPEVT_XFERNOTREADY:
1931                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1932                         dwc3_gadget_start_isoc(dwc, dep, event);
1933                 } else {
1934                         int ret;
1935
1936                         dev_vdbg(dwc->dev, "%s: reason %s\n",
1937                                         dep->name, event->status &
1938                                         DEPEVT_STATUS_TRANSFER_ACTIVE
1939                                         ? "Transfer Active"
1940                                         : "Transfer Not Active");
1941
1942                         ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
1943                         if (!ret || ret == -EBUSY)
1944                                 return;
1945
1946                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1947                                         dep->name);
1948                 }
1949
1950                 break;
1951         case DWC3_DEPEVT_STREAMEVT:
1952                 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
1953                         dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
1954                                         dep->name);
1955                         return;
1956                 }
1957
1958                 switch (event->status) {
1959                 case DEPEVT_STREAMEVT_FOUND:
1960                         dev_vdbg(dwc->dev, "Stream %d found and started\n",
1961                                         event->parameters);
1962
1963                         break;
1964                 case DEPEVT_STREAMEVT_NOTFOUND:
1965                         /* FALLTHROUGH */
1966                 default:
1967                         dev_dbg(dwc->dev, "Couldn't find suitable stream\n");
1968                 }
1969                 break;
1970         case DWC3_DEPEVT_RXTXFIFOEVT:
1971                 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name);
1972                 break;
1973         case DWC3_DEPEVT_EPCMDCMPLT:
1974                 dev_vdbg(dwc->dev, "Endpoint Command Complete\n");
1975                 break;
1976         }
1977 }
1978
1979 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
1980 {
1981         if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
1982                 spin_unlock(&dwc->lock);
1983                 dwc->gadget_driver->disconnect(&dwc->gadget);
1984                 spin_lock(&dwc->lock);
1985         }
1986 }
1987
1988 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum)
1989 {
1990         struct dwc3_ep *dep;
1991         struct dwc3_gadget_ep_cmd_params params;
1992         u32 cmd;
1993         int ret;
1994
1995         dep = dwc->eps[epnum];
1996
1997         if (!dep->resource_index)
1998                 return;
1999
2000         /*
2001          * NOTICE: We are violating what the Databook says about the
2002          * EndTransfer command. Ideally we would _always_ wait for the
2003          * EndTransfer Command Completion IRQ, but that's causing too
2004          * much trouble synchronizing between us and gadget driver.
2005          *
2006          * We have discussed this with the IP Provider and it was
2007          * suggested to giveback all requests here, but give HW some
2008          * extra time to synchronize with the interconnect. We're using
2009          * an arbitraty 100us delay for that.
2010          *
2011          * Note also that a similar handling was tested by Synopsys
2012          * (thanks a lot Paul) and nothing bad has come out of it.
2013          * In short, what we're doing is:
2014          *
2015          * - Issue EndTransfer WITH CMDIOC bit set
2016          * - Wait 100us
2017          */
2018
2019         cmd = DWC3_DEPCMD_ENDTRANSFER;
2020         cmd |= DWC3_DEPCMD_HIPRI_FORCERM | DWC3_DEPCMD_CMDIOC;
2021         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
2022         memset(&params, 0, sizeof(params));
2023         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
2024         WARN_ON_ONCE(ret);
2025         dep->resource_index = 0;
2026         dep->flags &= ~DWC3_EP_BUSY;
2027         udelay(100);
2028 }
2029
2030 static void dwc3_stop_active_transfers(struct dwc3 *dwc)
2031 {
2032         u32 epnum;
2033
2034         for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2035                 struct dwc3_ep *dep;
2036
2037                 dep = dwc->eps[epnum];
2038                 if (!dep)
2039                         continue;
2040
2041                 if (!(dep->flags & DWC3_EP_ENABLED))
2042                         continue;
2043
2044                 dwc3_remove_requests(dwc, dep);
2045         }
2046 }
2047
2048 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2049 {
2050         u32 epnum;
2051
2052         for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2053                 struct dwc3_ep *dep;
2054                 struct dwc3_gadget_ep_cmd_params params;
2055                 int ret;
2056
2057                 dep = dwc->eps[epnum];
2058                 if (!dep)
2059                         continue;
2060
2061                 if (!(dep->flags & DWC3_EP_STALL))
2062                         continue;
2063
2064                 dep->flags &= ~DWC3_EP_STALL;
2065
2066                 memset(&params, 0, sizeof(params));
2067                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
2068                                 DWC3_DEPCMD_CLEARSTALL, &params);
2069                 WARN_ON_ONCE(ret);
2070         }
2071 }
2072
2073 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2074 {
2075         int                     reg;
2076
2077         dev_vdbg(dwc->dev, "%s\n", __func__);
2078
2079         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2080         reg &= ~DWC3_DCTL_INITU1ENA;
2081         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2082
2083         reg &= ~DWC3_DCTL_INITU2ENA;
2084         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2085
2086         dwc3_disconnect_gadget(dwc);
2087         dwc->start_config_issued = false;
2088
2089         dwc->gadget.speed = USB_SPEED_UNKNOWN;
2090         dwc->setup_packet_pending = false;
2091 }
2092
2093 static void dwc3_gadget_usb3_phy_suspend(struct dwc3 *dwc, int suspend)
2094 {
2095         u32                     reg;
2096
2097         reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
2098
2099         if (suspend)
2100                 reg |= DWC3_GUSB3PIPECTL_SUSPHY;
2101         else
2102                 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
2103
2104         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
2105 }
2106
2107 static void dwc3_gadget_usb2_phy_suspend(struct dwc3 *dwc, int suspend)
2108 {
2109         u32                     reg;
2110
2111         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
2112
2113         if (suspend)
2114                 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
2115         else
2116                 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
2117
2118         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
2119 }
2120
2121 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2122 {
2123         u32                     reg;
2124
2125         dev_vdbg(dwc->dev, "%s\n", __func__);
2126
2127         /*
2128          * WORKAROUND: DWC3 revisions <1.88a have an issue which
2129          * would cause a missing Disconnect Event if there's a
2130          * pending Setup Packet in the FIFO.
2131          *
2132          * There's no suggested workaround on the official Bug
2133          * report, which states that "unless the driver/application
2134          * is doing any special handling of a disconnect event,
2135          * there is no functional issue".
2136          *
2137          * Unfortunately, it turns out that we _do_ some special
2138          * handling of a disconnect event, namely complete all
2139          * pending transfers, notify gadget driver of the
2140          * disconnection, and so on.
2141          *
2142          * Our suggested workaround is to follow the Disconnect
2143          * Event steps here, instead, based on a setup_packet_pending
2144          * flag. Such flag gets set whenever we have a XferNotReady
2145          * event on EP0 and gets cleared on XferComplete for the
2146          * same endpoint.
2147          *
2148          * Refers to:
2149          *
2150          * STAR#9000466709: RTL: Device : Disconnect event not
2151          * generated if setup packet pending in FIFO
2152          */
2153         if (dwc->revision < DWC3_REVISION_188A) {
2154                 if (dwc->setup_packet_pending)
2155                         dwc3_gadget_disconnect_interrupt(dwc);
2156         }
2157
2158         /* after reset -> Default State */
2159         usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
2160
2161         /* Recent versions support automatic phy suspend and don't need this */
2162         if (dwc->revision < DWC3_REVISION_194A) {
2163                 /* Resume PHYs */
2164                 dwc3_gadget_usb2_phy_suspend(dwc, false);
2165                 dwc3_gadget_usb3_phy_suspend(dwc, false);
2166         }
2167
2168         if (dwc->gadget.speed != USB_SPEED_UNKNOWN)
2169                 dwc3_disconnect_gadget(dwc);
2170
2171         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2172         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2173         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2174         dwc->test_mode = false;
2175
2176         dwc3_stop_active_transfers(dwc);
2177         dwc3_clear_stall_all_ep(dwc);
2178         dwc->start_config_issued = false;
2179
2180         /* Reset device address to zero */
2181         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2182         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2183         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2184 }
2185
2186 static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
2187 {
2188         u32 reg;
2189         u32 usb30_clock = DWC3_GCTL_CLK_BUS;
2190
2191         /*
2192          * We change the clock only at SS but I dunno why I would want to do
2193          * this. Maybe it becomes part of the power saving plan.
2194          */
2195
2196         if (speed != DWC3_DSTS_SUPERSPEED)
2197                 return;
2198
2199         /*
2200          * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2201          * each time on Connect Done.
2202          */
2203         if (!usb30_clock)
2204                 return;
2205
2206         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
2207         reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
2208         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
2209 }
2210
2211 static void dwc3_gadget_phy_suspend(struct dwc3 *dwc, u8 speed)
2212 {
2213         switch (speed) {
2214         case USB_SPEED_SUPER:
2215                 dwc3_gadget_usb2_phy_suspend(dwc, true);
2216                 break;
2217         case USB_SPEED_HIGH:
2218         case USB_SPEED_FULL:
2219         case USB_SPEED_LOW:
2220                 dwc3_gadget_usb3_phy_suspend(dwc, true);
2221                 break;
2222         }
2223 }
2224
2225 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2226 {
2227         struct dwc3_ep          *dep;
2228         int                     ret;
2229         u32                     reg;
2230         u8                      speed;
2231
2232         dev_vdbg(dwc->dev, "%s\n", __func__);
2233
2234         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2235         speed = reg & DWC3_DSTS_CONNECTSPD;
2236         dwc->speed = speed;
2237
2238         dwc3_update_ram_clk_sel(dwc, speed);
2239
2240         switch (speed) {
2241         case DWC3_DCFG_SUPERSPEED:
2242                 /*
2243                  * WORKAROUND: DWC3 revisions <1.90a have an issue which
2244                  * would cause a missing USB3 Reset event.
2245                  *
2246                  * In such situations, we should force a USB3 Reset
2247                  * event by calling our dwc3_gadget_reset_interrupt()
2248                  * routine.
2249                  *
2250                  * Refers to:
2251                  *
2252                  * STAR#9000483510: RTL: SS : USB3 reset event may
2253                  * not be generated always when the link enters poll
2254                  */
2255                 if (dwc->revision < DWC3_REVISION_190A)
2256                         dwc3_gadget_reset_interrupt(dwc);
2257
2258                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2259                 dwc->gadget.ep0->maxpacket = 512;
2260                 dwc->gadget.speed = USB_SPEED_SUPER;
2261                 break;
2262         case DWC3_DCFG_HIGHSPEED:
2263                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2264                 dwc->gadget.ep0->maxpacket = 64;
2265                 dwc->gadget.speed = USB_SPEED_HIGH;
2266                 break;
2267         case DWC3_DCFG_FULLSPEED2:
2268         case DWC3_DCFG_FULLSPEED1:
2269                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2270                 dwc->gadget.ep0->maxpacket = 64;
2271                 dwc->gadget.speed = USB_SPEED_FULL;
2272                 break;
2273         case DWC3_DCFG_LOWSPEED:
2274                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2275                 dwc->gadget.ep0->maxpacket = 8;
2276                 dwc->gadget.speed = USB_SPEED_LOW;
2277                 break;
2278         }
2279
2280         /* Enable USB2 LPM Capability */
2281
2282         if ((dwc->revision > DWC3_REVISION_194A)
2283                         && (speed != DWC3_DCFG_SUPERSPEED)) {
2284                 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2285                 reg |= DWC3_DCFG_LPM_CAP;
2286                 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2287
2288                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2289                 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2290
2291                 /*
2292                  * TODO: This should be configurable. For now using
2293                  * maximum allowed HIRD threshold value of 0b1100
2294                  */
2295                 reg |= DWC3_DCTL_HIRD_THRES(12);
2296
2297                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2298         }
2299
2300         /* Recent versions support automatic phy suspend and don't need this */
2301         if (dwc->revision < DWC3_REVISION_194A) {
2302                 /* Suspend unneeded PHY */
2303                 dwc3_gadget_phy_suspend(dwc, dwc->gadget.speed);
2304         }
2305
2306         dep = dwc->eps[0];
2307         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true);
2308         if (ret) {
2309                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2310                 return;
2311         }
2312
2313         dep = dwc->eps[1];
2314         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true);
2315         if (ret) {
2316                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2317                 return;
2318         }
2319
2320         /*
2321          * Configure PHY via GUSB3PIPECTLn if required.
2322          *
2323          * Update GTXFIFOSIZn
2324          *
2325          * In both cases reset values should be sufficient.
2326          */
2327 }
2328
2329 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2330 {
2331         dev_vdbg(dwc->dev, "%s\n", __func__);
2332
2333         /*
2334          * TODO take core out of low power mode when that's
2335          * implemented.
2336          */
2337
2338         dwc->gadget_driver->resume(&dwc->gadget);
2339 }
2340
2341 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2342                 unsigned int evtinfo)
2343 {
2344         enum dwc3_link_state    next = evtinfo & DWC3_LINK_STATE_MASK;
2345         unsigned int            pwropt;
2346
2347         /*
2348          * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2349          * Hibernation mode enabled which would show up when device detects
2350          * host-initiated U3 exit.
2351          *
2352          * In that case, device will generate a Link State Change Interrupt
2353          * from U3 to RESUME which is only necessary if Hibernation is
2354          * configured in.
2355          *
2356          * There are no functional changes due to such spurious event and we
2357          * just need to ignore it.
2358          *
2359          * Refers to:
2360          *
2361          * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2362          * operational mode
2363          */
2364         pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
2365         if ((dwc->revision < DWC3_REVISION_250A) &&
2366                         (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
2367                 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
2368                                 (next == DWC3_LINK_STATE_RESUME)) {
2369                         dev_vdbg(dwc->dev, "ignoring transition U3 -> Resume\n");
2370                         return;
2371                 }
2372         }
2373
2374         /*
2375          * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2376          * on the link partner, the USB session might do multiple entry/exit
2377          * of low power states before a transfer takes place.
2378          *
2379          * Due to this problem, we might experience lower throughput. The
2380          * suggested workaround is to disable DCTL[12:9] bits if we're
2381          * transitioning from U1/U2 to U0 and enable those bits again
2382          * after a transfer completes and there are no pending transfers
2383          * on any of the enabled endpoints.
2384          *
2385          * This is the first half of that workaround.
2386          *
2387          * Refers to:
2388          *
2389          * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2390          * core send LGO_Ux entering U0
2391          */
2392         if (dwc->revision < DWC3_REVISION_183A) {
2393                 if (next == DWC3_LINK_STATE_U0) {
2394                         u32     u1u2;
2395                         u32     reg;
2396
2397                         switch (dwc->link_state) {
2398                         case DWC3_LINK_STATE_U1:
2399                         case DWC3_LINK_STATE_U2:
2400                                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2401                                 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2402                                                 | DWC3_DCTL_ACCEPTU2ENA
2403                                                 | DWC3_DCTL_INITU1ENA
2404                                                 | DWC3_DCTL_ACCEPTU1ENA);
2405
2406                                 if (!dwc->u1u2)
2407                                         dwc->u1u2 = reg & u1u2;
2408
2409                                 reg &= ~u1u2;
2410
2411                                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2412                                 break;
2413                         default:
2414                                 /* do nothing */
2415                                 break;
2416                         }
2417                 }
2418         }
2419
2420         dwc->link_state = next;
2421
2422         dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state);
2423 }
2424
2425 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2426                 const struct dwc3_event_devt *event)
2427 {
2428         switch (event->type) {
2429         case DWC3_DEVICE_EVENT_DISCONNECT:
2430                 dwc3_gadget_disconnect_interrupt(dwc);
2431                 break;
2432         case DWC3_DEVICE_EVENT_RESET:
2433                 dwc3_gadget_reset_interrupt(dwc);
2434                 break;
2435         case DWC3_DEVICE_EVENT_CONNECT_DONE:
2436                 dwc3_gadget_conndone_interrupt(dwc);
2437                 break;
2438         case DWC3_DEVICE_EVENT_WAKEUP:
2439                 dwc3_gadget_wakeup_interrupt(dwc);
2440                 break;
2441         case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2442                 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2443                 break;
2444         case DWC3_DEVICE_EVENT_EOPF:
2445                 dev_vdbg(dwc->dev, "End of Periodic Frame\n");
2446                 break;
2447         case DWC3_DEVICE_EVENT_SOF:
2448                 dev_vdbg(dwc->dev, "Start of Periodic Frame\n");
2449                 break;
2450         case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2451                 dev_vdbg(dwc->dev, "Erratic Error\n");
2452                 break;
2453         case DWC3_DEVICE_EVENT_CMD_CMPL:
2454                 dev_vdbg(dwc->dev, "Command Complete\n");
2455                 break;
2456         case DWC3_DEVICE_EVENT_OVERFLOW:
2457                 dev_vdbg(dwc->dev, "Overflow\n");
2458                 break;
2459         default:
2460                 dev_dbg(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2461         }
2462 }
2463
2464 static void dwc3_process_event_entry(struct dwc3 *dwc,
2465                 const union dwc3_event *event)
2466 {
2467         /* Endpoint IRQ, handle it and return early */
2468         if (event->type.is_devspec == 0) {
2469                 /* depevt */
2470                 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2471         }
2472
2473         switch (event->type.type) {
2474         case DWC3_EVENT_TYPE_DEV:
2475                 dwc3_gadget_interrupt(dwc, &event->devt);
2476                 break;
2477         /* REVISIT what to do with Carkit and I2C events ? */
2478         default:
2479                 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2480         }
2481 }
2482
2483 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
2484 {
2485         struct dwc3 *dwc = _dwc;
2486         unsigned long flags;
2487         irqreturn_t ret = IRQ_NONE;
2488         int i;
2489
2490         spin_lock_irqsave(&dwc->lock, flags);
2491
2492         for (i = 0; i < dwc->num_event_buffers; i++) {
2493                 struct dwc3_event_buffer *evt;
2494                 int                     left;
2495
2496                 evt = dwc->ev_buffs[i];
2497                 left = evt->count;
2498
2499                 if (!(evt->flags & DWC3_EVENT_PENDING))
2500                         continue;
2501
2502                 while (left > 0) {
2503                         union dwc3_event event;
2504
2505                         event.raw = *(u32 *) (evt->buf + evt->lpos);
2506
2507                         dwc3_process_event_entry(dwc, &event);
2508
2509                         /*
2510                          * FIXME we wrap around correctly to the next entry as
2511                          * almost all entries are 4 bytes in size. There is one
2512                          * entry which has 12 bytes which is a regular entry
2513                          * followed by 8 bytes data. ATM I don't know how
2514                          * things are organized if we get next to the a
2515                          * boundary so I worry about that once we try to handle
2516                          * that.
2517                          */
2518                         evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
2519                         left -= 4;
2520
2521                         dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(i), 4);
2522                 }
2523
2524                 evt->count = 0;
2525                 evt->flags &= ~DWC3_EVENT_PENDING;
2526                 ret = IRQ_HANDLED;
2527         }
2528
2529         spin_unlock_irqrestore(&dwc->lock, flags);
2530
2531         return ret;
2532 }
2533
2534 static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
2535 {
2536         struct dwc3_event_buffer *evt;
2537         u32 count;
2538
2539         evt = dwc->ev_buffs[buf];
2540
2541         count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
2542         count &= DWC3_GEVNTCOUNT_MASK;
2543         if (!count)
2544                 return IRQ_NONE;
2545
2546         evt->count = count;
2547         evt->flags |= DWC3_EVENT_PENDING;
2548
2549         return IRQ_WAKE_THREAD;
2550 }
2551
2552 static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
2553 {
2554         struct dwc3                     *dwc = _dwc;
2555         int                             i;
2556         irqreturn_t                     ret = IRQ_NONE;
2557
2558         spin_lock(&dwc->lock);
2559
2560         for (i = 0; i < dwc->num_event_buffers; i++) {
2561                 irqreturn_t status;
2562
2563                 status = dwc3_process_event_buf(dwc, i);
2564                 if (status == IRQ_WAKE_THREAD)
2565                         ret = status;
2566         }
2567
2568         spin_unlock(&dwc->lock);
2569
2570         return ret;
2571 }
2572
2573 /**
2574  * dwc3_gadget_init - Initializes gadget related registers
2575  * @dwc: pointer to our controller context structure
2576  *
2577  * Returns 0 on success otherwise negative errno.
2578  */
2579 int dwc3_gadget_init(struct dwc3 *dwc)
2580 {
2581         u32                                     reg;
2582         int                                     ret;
2583
2584         dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2585                         &dwc->ctrl_req_addr, GFP_KERNEL);
2586         if (!dwc->ctrl_req) {
2587                 dev_err(dwc->dev, "failed to allocate ctrl request\n");
2588                 ret = -ENOMEM;
2589                 goto err0;
2590         }
2591
2592         dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2593                         &dwc->ep0_trb_addr, GFP_KERNEL);
2594         if (!dwc->ep0_trb) {
2595                 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
2596                 ret = -ENOMEM;
2597                 goto err1;
2598         }
2599
2600         dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
2601         if (!dwc->setup_buf) {
2602                 dev_err(dwc->dev, "failed to allocate setup buffer\n");
2603                 ret = -ENOMEM;
2604                 goto err2;
2605         }
2606
2607         dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
2608                         DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
2609                         GFP_KERNEL);
2610         if (!dwc->ep0_bounce) {
2611                 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
2612                 ret = -ENOMEM;
2613                 goto err3;
2614         }
2615
2616         dwc->gadget.ops                 = &dwc3_gadget_ops;
2617         dwc->gadget.max_speed           = USB_SPEED_SUPER;
2618         dwc->gadget.speed               = USB_SPEED_UNKNOWN;
2619         dwc->gadget.sg_supported        = true;
2620         dwc->gadget.name                = "dwc3-gadget";
2621
2622         /*
2623          * REVISIT: Here we should clear all pending IRQs to be
2624          * sure we're starting from a well known location.
2625          */
2626
2627         ret = dwc3_gadget_init_endpoints(dwc);
2628         if (ret)
2629                 goto err4;
2630
2631         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2632         reg |= DWC3_DCFG_LPM_CAP;
2633         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2634
2635         /* Enable USB2 LPM and automatic phy suspend only on recent versions */
2636         if (dwc->revision >= DWC3_REVISION_194A) {
2637                 dwc3_gadget_usb2_phy_suspend(dwc, false);
2638                 dwc3_gadget_usb3_phy_suspend(dwc, false);
2639         }
2640
2641         ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
2642         if (ret) {
2643                 dev_err(dwc->dev, "failed to register udc\n");
2644                 goto err5;
2645         }
2646
2647         return 0;
2648
2649 err5:
2650         dwc3_gadget_free_endpoints(dwc);
2651
2652 err4:
2653         dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2654                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
2655
2656 err3:
2657         kfree(dwc->setup_buf);
2658
2659 err2:
2660         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2661                         dwc->ep0_trb, dwc->ep0_trb_addr);
2662
2663 err1:
2664         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2665                         dwc->ctrl_req, dwc->ctrl_req_addr);
2666
2667 err0:
2668         return ret;
2669 }
2670
2671 /* -------------------------------------------------------------------------- */
2672
2673 void dwc3_gadget_exit(struct dwc3 *dwc)
2674 {
2675         usb_del_gadget_udc(&dwc->gadget);
2676
2677         dwc3_gadget_free_endpoints(dwc);
2678
2679         dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2680                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
2681
2682         kfree(dwc->setup_buf);
2683
2684         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2685                         dwc->ep0_trb, dwc->ep0_trb_addr);
2686
2687         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2688                         dwc->ctrl_req, dwc->ctrl_req_addr);
2689 }
2690
2691 int dwc3_gadget_prepare(struct dwc3 *dwc)
2692 {
2693         if (dwc->pullups_connected)
2694                 dwc3_gadget_disable_irq(dwc);
2695
2696         return 0;
2697 }
2698
2699 void dwc3_gadget_complete(struct dwc3 *dwc)
2700 {
2701         if (dwc->pullups_connected) {
2702                 dwc3_gadget_enable_irq(dwc);
2703                 dwc3_gadget_run_stop(dwc, true);
2704         }
2705 }
2706
2707 int dwc3_gadget_suspend(struct dwc3 *dwc)
2708 {
2709         __dwc3_gadget_ep_disable(dwc->eps[0]);
2710         __dwc3_gadget_ep_disable(dwc->eps[1]);
2711
2712         dwc->dcfg = dwc3_readl(dwc->regs, DWC3_DCFG);
2713
2714         return 0;
2715 }
2716
2717 int dwc3_gadget_resume(struct dwc3 *dwc)
2718 {
2719         struct dwc3_ep          *dep;
2720         int                     ret;
2721
2722         /* Start with SuperSpeed Default */
2723         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2724
2725         dep = dwc->eps[0];
2726         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
2727         if (ret)
2728                 goto err0;
2729
2730         dep = dwc->eps[1];
2731         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
2732         if (ret)
2733                 goto err1;
2734
2735         /* begin to receive SETUP packets */
2736         dwc->ep0state = EP0_SETUP_PHASE;
2737         dwc3_ep0_out_start(dwc);
2738
2739         dwc3_writel(dwc->regs, DWC3_DCFG, dwc->dcfg);
2740
2741         return 0;
2742
2743 err1:
2744         __dwc3_gadget_ep_disable(dwc->eps[0]);
2745
2746 err0:
2747         return ret;
2748 }