drivers/usb/dwc3/gadget.c

   1 /**
   2  * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
   3  *
   4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Authors: Felipe Balbi <balbi@ti.com>,
   7  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions, and the following disclaimer,
  14  *    without modification.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. The names of the above-listed copyright holders may not be used
  19  *    to endorse or promote products derived from this software without
  20  *    specific prior written permission.
  21  *
  22  * ALTERNATIVELY, this software may be distributed under the terms of the
  23  * GNU General Public License ("GPL") version 2, as published by the Free
  24  * Software Foundation.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  27  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  28  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  29  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  30  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  31  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  32  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  33  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  34  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  35  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  36  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #include <linux/kernel.h>
  40 #include <linux/delay.h>
  41 #include <linux/slab.h>
  42 #include <linux/spinlock.h>
  43 #include <linux/platform_device.h>
  44 #include <linux/pm_runtime.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/io.h>
  47 #include <linux/list.h>
  48 #include <linux/dma-mapping.h>
  49
  50 #include <linux/usb/ch9.h>
  51 #include <linux/usb/gadget.h>
  52
  53 #include "core.h"
  54 #include "gadget.h"
  55 #include "io.h"
  56
  57 /**
  58  * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
  59  * @dwc: pointer to our context structure
  60  * @mode: the mode to set (J, K SE0 NAK, Force Enable)
  61  *
  62  * Caller should take care of locking. This function will
  63  * return 0 on success or -EINVAL if wrong Test Selector
  64  * is passed
  65  */
  66 int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
  67 {
  68         u32             reg;
  69
  70         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
  71         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
  72
  73         switch (mode) {
  74         case TEST_J:
  75         case TEST_K:
  76         case TEST_SE0_NAK:
  77         case TEST_PACKET:
  78         case TEST_FORCE_EN:
  79                 reg |= mode << 1;
  80                 break;
  81         default:
  82                 return -EINVAL;
  83         }
  84
  85         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
  86
  87         return 0;
  88 }
  89
  90 /**
  91  * dwc3_gadget_set_link_state - Sets USB Link to a particular State
  92  * @dwc: pointer to our context structure
  93  * @state: the state to put link into
  94  *
  95  * Caller should take care of locking. This function will
  96  * return 0 on success or -ETIMEDOUT.
  97  */
  98 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
  99 {
 100         int             retries = 10000;
 101         u32             reg;
 102
 103         /*
 104          * Wait until device controller is ready. Only applies to 1.94a and
 105          * later RTL.
 106          */
 107         if (dwc->revision >= DWC3_REVISION_194A) {
 108                 while (--retries) {
 109                         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 110                         if (reg & DWC3_DSTS_DCNRD)
 111                                 udelay(5);
 112                         else
 113                                 break;
 114                 }
 115
 116                 if (retries <= 0)
 117                         return -ETIMEDOUT;
 118         }
 119
 120         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 121         reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
 122
 123         /* set requested state */
 124         reg |= DWC3_DCTL_ULSTCHNGREQ(state);
 125         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 126
 127         /*
 128          * The following code is racy when called from dwc3_gadget_wakeup,
 129          * and is not needed, at least on newer versions
 130          */
 131         if (dwc->revision >= DWC3_REVISION_194A)
 132                 return 0;
 133
 134         /* wait for a change in DSTS */
 135         retries = 10000;
 136         while (--retries) {
 137                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 138
 139                 if (DWC3_DSTS_USBLNKST(reg) == state)
 140                         return 0;
 141
 142                 udelay(5);
 143         }
 144
 145         dev_vdbg(dwc->dev, "link state change request timed out\n");
 146
 147         return -ETIMEDOUT;
 148 }
 149
 150 /**
 151  * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
 152  * @dwc: pointer to our context structure
 153  *
 154  * This function will a best effort FIFO allocation in order
 155  * to improve FIFO usage and throughput, while still allowing
 156  * us to enable as many endpoints as possible.
 157  *
 158  * Keep in mind that this operation will be highly dependent
 159  * on the configured size for RAM1 - which contains TxFifo -,
 160  * the amount of endpoints enabled on coreConsultant tool, and
 161  * the width of the Master Bus.
 162  *
 163  * In the ideal world, we would always be able to satisfy the
 164  * following equation:
 165  *
 166  * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
 167  * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
 168  *
 169  * Unfortunately, due to many variables that's not always the case.
 170  */
 171 int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
 172 {
 173         int             last_fifo_depth = 0;
 174         int             ram1_depth;
 175         int             fifo_size;
 176         int             mdwidth;
 177         int             num;
 178
 179         if (!dwc->needs_fifo_resize)
 180                 return 0;
 181
 182         ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
 183         mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
 184
 185         /* MDWIDTH is represented in bits, we need it in bytes */
 186         mdwidth >>= 3;
 187
 188         /*
 189          * FIXME For now we will only allocate 1 wMaxPacketSize space
 190          * for each enabled endpoint, later patches will come to
 191          * improve this algorithm so that we better use the internal
 192          * FIFO space
 193          */
 194         for (num = 0; num < DWC3_ENDPOINTS_NUM; num++) {
 195                 struct dwc3_ep  *dep = dwc->eps[num];
 196                 int             fifo_number = dep->number >> 1;
 197                 int             mult = 1;
 198                 int             tmp;
 199
 200                 if (!(dep->number & 1))
 201                         continue;
 202
 203                 if (!(dep->flags & DWC3_EP_ENABLED))
 204                         continue;
 205
 206                 if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
 207                                 || usb_endpoint_xfer_isoc(dep->endpoint.desc))
 208                         mult = 3;
 209
 210                 /*
 211                  * REVISIT: the following assumes we will always have enough
 212                  * space available on the FIFO RAM for all possible use cases.
 213                  * Make sure that's true somehow and change FIFO allocation
 214                  * accordingly.
 215                  *
 216                  * If we have Bulk or Isochronous endpoints, we want
 217                  * them to be able to be very, very fast. So we're giving
 218                  * those endpoints a fifo_size which is enough for 3 full
 219                  * packets
 220                  */
 221                 tmp = mult * (dep->endpoint.maxpacket + mdwidth);
 222                 tmp += mdwidth;
 223
 224                 fifo_size = DIV_ROUND_UP(tmp, mdwidth);
 225
 226                 fifo_size |= (last_fifo_depth << 16);
 227
 228                 dev_vdbg(dwc->dev, "%s: Fifo Addr %04x Size %d\n",
 229                                 dep->name, last_fifo_depth, fifo_size & 0xffff);
 230
 231                 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(fifo_number),
 232                                 fifo_size);
 233
 234                 last_fifo_depth += (fifo_size & 0xffff);
 235         }
 236
 237         return 0;
 238 }
 239
 240 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 241                 int status)
 242 {
 243         struct dwc3                     *dwc = dep->dwc;
 244
 245         if (req->queued) {
 246                 if (req->request.num_mapped_sgs)
 247                         dep->busy_slot += req->request.num_mapped_sgs;
 248                 else
 249                         dep->busy_slot++;
 250
 251                 /*
 252                  * Skip LINK TRB. We can't use req->trb and check for
 253                  * DWC3_TRBCTL_LINK_TRB because it points the TRB we just
 254                  * completed (not the LINK TRB).
 255                  */
 256                 if (((dep->busy_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
 257                                 usb_endpoint_xfer_isoc(dep->endpoint.desc))
 258                         dep->busy_slot++;
 259         }
 260         list_del(&req->list);
 261         req->trb = NULL;
 262
 263         if (req->request.status == -EINPROGRESS)
 264                 req->request.status = status;
 265
 266         if (dwc->ep0_bounced && dep->number == 0)
 267                 dwc->ep0_bounced = false;
 268         else
 269                 usb_gadget_unmap_request(&dwc->gadget, &req->request,
 270                                 req->direction);
 271
 272         dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
 273                         req, dep->name, req->request.actual,
 274                         req->request.length, status);
 275
 276         spin_unlock(&dwc->lock);
 277         req->request.complete(&dep->endpoint, &req->request);
 278         spin_lock(&dwc->lock);
 279 }
 280
 281 static const char *dwc3_gadget_ep_cmd_string(u8 cmd)
 282 {
 283         switch (cmd) {
 284         case DWC3_DEPCMD_DEPSTARTCFG:
 285                 return "Start New Configuration";
 286         case DWC3_DEPCMD_ENDTRANSFER:
 287                 return "End Transfer";
 288         case DWC3_DEPCMD_UPDATETRANSFER:
 289                 return "Update Transfer";
 290         case DWC3_DEPCMD_STARTTRANSFER:
 291                 return "Start Transfer";
 292         case DWC3_DEPCMD_CLEARSTALL:
 293                 return "Clear Stall";
 294         case DWC3_DEPCMD_SETSTALL:
 295                 return "Set Stall";
 296         case DWC3_DEPCMD_GETEPSTATE:
 297                 return "Get Endpoint State";
 298         case DWC3_DEPCMD_SETTRANSFRESOURCE:
 299                 return "Set Endpoint Transfer Resource";
 300         case DWC3_DEPCMD_SETEPCONFIG:
 301                 return "Set Endpoint Configuration";
 302         default:
 303                 return "UNKNOWN command";
 304         }
 305 }
 306
 307 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param)
 308 {
 309         u32             timeout = 500;
 310         u32             reg;
 311
 312         dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
 313         dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
 314
 315         do {
 316                 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
 317                 if (!(reg & DWC3_DGCMD_CMDACT)) {
 318                         dev_vdbg(dwc->dev, "Command Complete --> %d\n",
 319                                         DWC3_DGCMD_STATUS(reg));
 320                         return 0;
 321                 }
 322
 323                 /*
 324                  * We can't sleep here, because it's also called from
 325                  * interrupt context.
 326                  */
 327                 timeout--;
 328                 if (!timeout)
 329                         return -ETIMEDOUT;
 330                 udelay(1);
 331         } while (1);
 332 }
 333
 334 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
 335                 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
 336 {
 337         struct dwc3_ep          *dep = dwc->eps[ep];
 338         u32                     timeout = 500;
 339         u32                     reg;
 340
 341         dev_vdbg(dwc->dev, "%s: cmd '%s' params %08x %08x %08x\n",
 342                         dep->name,
 343                         dwc3_gadget_ep_cmd_string(cmd), params->param0,
 344                         params->param1, params->param2);
 345
 346         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
 347         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
 348         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
 349
 350         dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
 351         do {
 352                 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
 353                 if (!(reg & DWC3_DEPCMD_CMDACT)) {
 354                         dev_vdbg(dwc->dev, "Command Complete --> %d\n",
 355                                         DWC3_DEPCMD_STATUS(reg));
 356                         return 0;
 357                 }
 358
 359                 /*
 360                  * We can't sleep here, because it is also called from
 361                  * interrupt context.
 362                  */
 363                 timeout--;
 364                 if (!timeout)
 365                         return -ETIMEDOUT;
 366
 367                 udelay(1);
 368         } while (1);
 369 }
 370
 371 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
 372                 struct dwc3_trb *trb)
 373 {
 374         u32             offset = (char *) trb - (char *) dep->trb_pool;
 375
 376         return dep->trb_pool_dma + offset;
 377 }
 378
 379 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
 380 {
 381         struct dwc3             *dwc = dep->dwc;
 382
 383         if (dep->trb_pool)
 384                 return 0;
 385
 386         if (dep->number == 0 || dep->number == 1)
 387                 return 0;
 388
 389         dep->trb_pool = dma_alloc_coherent(dwc->dev,
 390                         sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 391                         &dep->trb_pool_dma, GFP_KERNEL);
 392         if (!dep->trb_pool) {
 393                 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
 394                                 dep->name);
 395                 return -ENOMEM;
 396         }
 397
 398         return 0;
 399 }
 400
 401 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
 402 {
 403         struct dwc3             *dwc = dep->dwc;
 404
 405         dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 406                         dep->trb_pool, dep->trb_pool_dma);
 407
 408         dep->trb_pool = NULL;
 409         dep->trb_pool_dma = 0;
 410 }
 411
 412 static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
 413 {
 414         struct dwc3_gadget_ep_cmd_params params;
 415         u32                     cmd;
 416
 417         memset(&params, 0x00, sizeof(params));
 418
 419         if (dep->number != 1) {
 420                 cmd = DWC3_DEPCMD_DEPSTARTCFG;
 421                 /* XferRscIdx == 0 for ep0 and 2 for the remaining */
 422                 if (dep->number > 1) {
 423                         if (dwc->start_config_issued)
 424                                 return 0;
 425                         dwc->start_config_issued = true;
 426                         cmd |= DWC3_DEPCMD_PARAM(2);
 427                 }
 428
 429                 return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, &params);
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
 436                 const struct usb_endpoint_descriptor *desc,
 437                 const struct usb_ss_ep_comp_descriptor *comp_desc,
 438                 bool ignore)
 439 {
 440         struct dwc3_gadget_ep_cmd_params params;
 441
 442         memset(&params, 0x00, sizeof(params));
 443
 444         params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
 445                 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
 446
 447         /* Burst size is only needed in SuperSpeed mode */
 448         if (dwc->gadget.speed == USB_SPEED_SUPER) {
 449                 u32 burst = dep->endpoint.maxburst - 1;
 450
 451                 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst);
 452         }
 453
 454         if (ignore)
 455                 params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
 456
 457         params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
 458                 | DWC3_DEPCFG_XFER_NOT_READY_EN;
 459
 460         if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
 461                 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
 462                         | DWC3_DEPCFG_STREAM_EVENT_EN;
 463                 dep->stream_capable = true;
 464         }
 465
 466         if (usb_endpoint_xfer_isoc(desc))
 467                 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
 468
 469         /*
 470          * We are doing 1:1 mapping for endpoints, meaning
 471          * Physical Endpoints 2 maps to Logical Endpoint 2 and
 472          * so on. We consider the direction bit as part of the physical
 473          * endpoint number. So USB endpoint 0x81 is 0x03.
 474          */
 475         params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
 476
 477         /*
 478          * We must use the lower 16 TX FIFOs even though
 479          * HW might have more
 480          */
 481         if (dep->direction)
 482                 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
 483
 484         if (desc->bInterval) {
 485                 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
 486                 dep->interval = 1 << (desc->bInterval - 1);
 487         }
 488
 489         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 490                         DWC3_DEPCMD_SETEPCONFIG, &params);
 491 }
 492
 493 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
 494 {
 495         struct dwc3_gadget_ep_cmd_params params;
 496
 497         memset(&params, 0x00, sizeof(params));
 498
 499         params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
 500
 501         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 502                         DWC3_DEPCMD_SETTRANSFRESOURCE, &params);
 503 }
 504
 505 /**
 506  * __dwc3_gadget_ep_enable - Initializes a HW endpoint
 507  * @dep: endpoint to be initialized
 508  * @desc: USB Endpoint Descriptor
 509  *
 510  * Caller should take care of locking
 511  */
 512 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
 513                 const struct usb_endpoint_descriptor *desc,
 514                 const struct usb_ss_ep_comp_descriptor *comp_desc,
 515                 bool ignore)
 516 {
 517         struct dwc3             *dwc = dep->dwc;
 518         u32                     reg;
 519         int                     ret = -ENOMEM;
 520
 521         if (!(dep->flags & DWC3_EP_ENABLED)) {
 522                 ret = dwc3_gadget_start_config(dwc, dep);
 523                 if (ret)
 524                         return ret;
 525         }
 526
 527         ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore);
 528         if (ret)
 529                 return ret;
 530
 531         if (!(dep->flags & DWC3_EP_ENABLED)) {
 532                 struct dwc3_trb *trb_st_hw;
 533                 struct dwc3_trb *trb_link;
 534
 535                 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
 536                 if (ret)
 537                         return ret;
 538
 539                 dep->endpoint.desc = desc;
 540                 dep->comp_desc = comp_desc;
 541                 dep->type = usb_endpoint_type(desc);
 542                 dep->flags |= DWC3_EP_ENABLED;
 543
 544                 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 545                 reg |= DWC3_DALEPENA_EP(dep->number);
 546                 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 547
 548                 if (!usb_endpoint_xfer_isoc(desc))
 549                         return 0;
 550
 551                 memset(&trb_link, 0, sizeof(trb_link));
 552
 553                 /* Link TRB for ISOC. The HWO bit is never reset */
 554                 trb_st_hw = &dep->trb_pool[0];
 555
 556                 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
 557
 558                 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 559                 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 560                 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
 561                 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
 562         }
 563
 564         return 0;
 565 }
 566
 567 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum);
 568 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 569 {
 570         struct dwc3_request             *req;
 571
 572         if (!list_empty(&dep->req_queued)) {
 573                 dwc3_stop_active_transfer(dwc, dep->number);
 574
 575                 /* - giveback all requests to gadget driver */
 576                 while (!list_empty(&dep->req_queued)) {
 577                         req = next_request(&dep->req_queued);
 578
 579                         dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 580                 }
 581         }
 582
 583         while (!list_empty(&dep->request_list)) {
 584                 req = next_request(&dep->request_list);
 585
 586                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 587         }
 588 }
 589
 590 /**
 591  * __dwc3_gadget_ep_disable - Disables a HW endpoint
 592  * @dep: the endpoint to disable
 593  *
 594  * This function also removes requests which are currently processed ny the
 595  * hardware and those which are not yet scheduled.
 596  * Caller should take care of locking.
 597  */
 598 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
 599 {
 600         struct dwc3             *dwc = dep->dwc;
 601         u32                     reg;
 602
 603         dwc3_remove_requests(dwc, dep);
 604
 605         reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 606         reg &= ~DWC3_DALEPENA_EP(dep->number);
 607         dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 608
 609         dep->stream_capable = false;
 610         dep->endpoint.desc = NULL;
 611         dep->comp_desc = NULL;
 612         dep->type = 0;
 613         dep->flags = 0;
 614
 615         return 0;
 616 }
 617
 618 /* -------------------------------------------------------------------------- */
 619
 620 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
 621                 const struct usb_endpoint_descriptor *desc)
 622 {
 623         return -EINVAL;
 624 }
 625
 626 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
 627 {
 628         return -EINVAL;
 629 }
 630
 631 /* -------------------------------------------------------------------------- */
 632
 633 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
 634                 const struct usb_endpoint_descriptor *desc)
 635 {
 636         struct dwc3_ep                  *dep;
 637         struct dwc3                     *dwc;
 638         unsigned long                   flags;
 639         int                             ret;
 640
 641         if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
 642                 pr_debug("dwc3: invalid parameters\n");
 643                 return -EINVAL;
 644         }
 645
 646         if (!desc->wMaxPacketSize) {
 647                 pr_debug("dwc3: missing wMaxPacketSize\n");
 648                 return -EINVAL;
 649         }
 650
 651         dep = to_dwc3_ep(ep);
 652         dwc = dep->dwc;
 653
 654         if (dep->flags & DWC3_EP_ENABLED) {
 655                 dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n",
 656                                 dep->name);
 657                 return 0;
 658         }
 659
 660         switch (usb_endpoint_type(desc)) {
 661         case USB_ENDPOINT_XFER_CONTROL:
 662                 strlcat(dep->name, "-control", sizeof(dep->name));
 663                 break;
 664         case USB_ENDPOINT_XFER_ISOC:
 665                 strlcat(dep->name, "-isoc", sizeof(dep->name));
 666                 break;
 667         case USB_ENDPOINT_XFER_BULK:
 668                 strlcat(dep->name, "-bulk", sizeof(dep->name));
 669                 break;
 670         case USB_ENDPOINT_XFER_INT:
 671                 strlcat(dep->name, "-int", sizeof(dep->name));
 672                 break;
 673         default:
 674                 dev_err(dwc->dev, "invalid endpoint transfer type\n");
 675         }
 676
 677         dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);
 678
 679         spin_lock_irqsave(&dwc->lock, flags);
 680         ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false);
 681         spin_unlock_irqrestore(&dwc->lock, flags);
 682
 683         return ret;
 684 }
 685
 686 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
 687 {
 688         struct dwc3_ep                  *dep;
 689         struct dwc3                     *dwc;
 690         unsigned long                   flags;
 691         int                             ret;
 692
 693         if (!ep) {
 694                 pr_debug("dwc3: invalid parameters\n");
 695                 return -EINVAL;
 696         }
 697
 698         dep = to_dwc3_ep(ep);
 699         dwc = dep->dwc;
 700
 701         if (!(dep->flags & DWC3_EP_ENABLED)) {
 702                 dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n",
 703                                 dep->name);
 704                 return 0;
 705         }
 706
 707         snprintf(dep->name, sizeof(dep->name), "ep%d%s",
 708                         dep->number >> 1,
 709                         (dep->number & 1) ? "in" : "out");
 710
 711         spin_lock_irqsave(&dwc->lock, flags);
 712         ret = __dwc3_gadget_ep_disable(dep);
 713         spin_unlock_irqrestore(&dwc->lock, flags);
 714
 715         return ret;
 716 }
 717
 718 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
 719         gfp_t gfp_flags)
 720 {
 721         struct dwc3_request             *req;
 722         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 723         struct dwc3                     *dwc = dep->dwc;
 724
 725         req = kzalloc(sizeof(*req), gfp_flags);
 726         if (!req) {
 727                 dev_err(dwc->dev, "not enough memory\n");
 728                 return NULL;
 729         }
 730
 731         req->epnum      = dep->number;
 732         req->dep        = dep;
 733
 734         return &req->request;
 735 }
 736
 737 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
 738                 struct usb_request *request)
 739 {
 740         struct dwc3_request             *req = to_dwc3_request(request);
 741
 742         kfree(req);
 743 }
 744
 745 /**
 746  * dwc3_prepare_one_trb - setup one TRB from one request
 747  * @dep: endpoint for which this request is prepared
 748  * @req: dwc3_request pointer
 749  */
 750 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
 751                 struct dwc3_request *req, dma_addr_t dma,
 752                 unsigned length, unsigned last, unsigned chain)
 753 {
 754         struct dwc3             *dwc = dep->dwc;
 755         struct dwc3_trb         *trb;
 756
 757         unsigned int            cur_slot;
 758
 759         dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n",
 760                         dep->name, req, (unsigned long long) dma,
 761                         length, last ? " last" : "",
 762                         chain ? " chain" : "");
 763
 764         trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
 765         cur_slot = dep->free_slot;
 766         dep->free_slot++;
 767
 768         /* Skip the LINK-TRB on ISOC */
 769         if (((cur_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
 770                         usb_endpoint_xfer_isoc(dep->endpoint.desc))
 771                 return;
 772
 773         if (!req->trb) {
 774                 dwc3_gadget_move_request_queued(req);
 775                 req->trb = trb;
 776                 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
 777         }
 778
 779         trb->size = DWC3_TRB_SIZE_LENGTH(length);
 780         trb->bpl = lower_32_bits(dma);
 781         trb->bph = upper_32_bits(dma);
 782
 783         switch (usb_endpoint_type(dep->endpoint.desc)) {
 784         case USB_ENDPOINT_XFER_CONTROL:
 785                 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
 786                 break;
 787
 788         case USB_ENDPOINT_XFER_ISOC:
 789                 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
 790
 791                 if (!req->request.no_interrupt)
 792                         trb->ctrl |= DWC3_TRB_CTRL_IOC;
 793                 break;
 794
 795         case USB_ENDPOINT_XFER_BULK:
 796         case USB_ENDPOINT_XFER_INT:
 797                 trb->ctrl = DWC3_TRBCTL_NORMAL;
 798                 break;
 799         default:
 800                 /*
 801                  * This is only possible with faulty memory because we
 802                  * checked it already :)
 803                  */
 804                 BUG();
 805         }
 806
 807         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 808                 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
 809                 trb->ctrl |= DWC3_TRB_CTRL_CSP;
 810         } else {
 811                 if (chain)
 812                         trb->ctrl |= DWC3_TRB_CTRL_CHN;
 813
 814                 if (last)
 815                         trb->ctrl |= DWC3_TRB_CTRL_LST;
 816         }
 817
 818         if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
 819                 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
 820
 821         trb->ctrl |= DWC3_TRB_CTRL_HWO;
 822 }
 823
 824 /*
 825  * dwc3_prepare_trbs - setup TRBs from requests
 826  * @dep: endpoint for which requests are being prepared
 827  * @starting: true if the endpoint is idle and no requests are queued.
 828  *
 829  * The function goes through the requests list and sets up TRBs for the
 830  * transfers. The function returns once there are no more TRBs available or
 831  * it runs out of requests.
 832  */
 833 static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting)
 834 {
 835         struct dwc3_request     *req, *n;
 836         u32                     trbs_left;
 837         u32                     max;
 838         unsigned int            last_one = 0;
 839
 840         BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
 841
 842         /* the first request must not be queued */
 843         trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
 844
 845         /* Can't wrap around on a non-isoc EP since there's no link TRB */
 846         if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 847                 max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK);
 848                 if (trbs_left > max)
 849                         trbs_left = max;
 850         }
 851
 852         /*
 853          * If busy & slot are equal than it is either full or empty. If we are
 854          * starting to process requests then we are empty. Otherwise we are
 855          * full and don't do anything
 856          */
 857         if (!trbs_left) {
 858                 if (!starting)
 859                         return;
 860                 trbs_left = DWC3_TRB_NUM;
 861                 /*
 862                  * In case we start from scratch, we queue the ISOC requests
 863                  * starting from slot 1. This is done because we use ring
 864                  * buffer and have no LST bit to stop us. Instead, we place
 865                  * IOC bit every TRB_NUM/4. We try to avoid having an interrupt
 866                  * after the first request so we start at slot 1 and have
 867                  * 7 requests proceed before we hit the first IOC.
 868                  * Other transfer types don't use the ring buffer and are
 869                  * processed from the first TRB until the last one. Since we
 870                  * don't wrap around we have to start at the beginning.
 871                  */
 872                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 873                         dep->busy_slot = 1;
 874                         dep->free_slot = 1;
 875                 } else {
 876                         dep->busy_slot = 0;
 877                         dep->free_slot = 0;
 878                 }
 879         }
 880
 881         /* The last TRB is a link TRB, not used for xfer */
 882         if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc))
 883                 return;
 884
 885         list_for_each_entry_safe(req, n, &dep->request_list, list) {
 886                 unsigned        length;
 887                 dma_addr_t      dma;
 888
 889                 if (req->request.num_mapped_sgs > 0) {
 890                         struct usb_request *request = &req->request;
 891                         struct scatterlist *sg = request->sg;
 892                         struct scatterlist *s;
 893                         int             i;
 894
 895                         for_each_sg(sg, s, request->num_mapped_sgs, i) {
 896                                 unsigned chain = true;
 897
 898                                 length = sg_dma_len(s);
 899                                 dma = sg_dma_address(s);
 900
 901                                 if (i == (request->num_mapped_sgs - 1) ||
 902                                                 sg_is_last(s)) {
 903                                         last_one = true;
 904                                         chain = false;
 905                                 }
 906
 907                                 trbs_left--;
 908                                 if (!trbs_left)
 909                                         last_one = true;
 910
 911                                 if (last_one)
 912                                         chain = false;
 913
 914                                 dwc3_prepare_one_trb(dep, req, dma, length,
 915                                                 last_one, chain);
 916
 917                                 if (last_one)
 918                                         break;
 919                         }
 920                 } else {
 921                         dma = req->request.dma;
 922                         length = req->request.length;
 923                         trbs_left--;
 924
 925                         if (!trbs_left)
 926                                 last_one = 1;
 927
 928                         /* Is this the last request? */
 929                         if (list_is_last(&req->list, &dep->request_list))
 930                                 last_one = 1;
 931
 932                         dwc3_prepare_one_trb(dep, req, dma, length,
 933                                         last_one, false);
 934
 935                         if (last_one)
 936                                 break;
 937                 }
 938         }
 939 }
 940
 941 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
 942                 int start_new)
 943 {
 944         struct dwc3_gadget_ep_cmd_params params;
 945         struct dwc3_request             *req;
 946         struct dwc3                     *dwc = dep->dwc;
 947         int                             ret;
 948         u32                             cmd;
 949
 950         if (start_new && (dep->flags & DWC3_EP_BUSY)) {
 951                 dev_vdbg(dwc->dev, "%s: endpoint busy\n", dep->name);
 952                 return -EBUSY;
 953         }
 954         dep->flags &= ~DWC3_EP_PENDING_REQUEST;
 955
 956         /*
 957          * If we are getting here after a short-out-packet we don't enqueue any
 958          * new requests as we try to set the IOC bit only on the last request.
 959          */
 960         if (start_new) {
 961                 if (list_empty(&dep->req_queued))
 962                         dwc3_prepare_trbs(dep, start_new);
 963
 964                 /* req points to the first request which will be sent */
 965                 req = next_request(&dep->req_queued);
 966         } else {
 967                 dwc3_prepare_trbs(dep, start_new);
 968
 969                 /*
 970                  * req points to the first request where HWO changed from 0 to 1
 971                  */
 972                 req = next_request(&dep->req_queued);
 973         }
 974         if (!req) {
 975                 dep->flags |= DWC3_EP_PENDING_REQUEST;
 976                 return 0;
 977         }
 978
 979         memset(&params, 0, sizeof(params));
 980         params.param0 = upper_32_bits(req->trb_dma);
 981         params.param1 = lower_32_bits(req->trb_dma);
 982
 983         if (start_new)
 984                 cmd = DWC3_DEPCMD_STARTTRANSFER;
 985         else
 986                 cmd = DWC3_DEPCMD_UPDATETRANSFER;
 987
 988         cmd |= DWC3_DEPCMD_PARAM(cmd_param);
 989         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
 990         if (ret < 0) {
 991                 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
 992
 993                 /*
 994                  * FIXME we need to iterate over the list of requests
 995                  * here and stop, unmap, free and del each of the linked
 996                  * requests instead of what we do now.
 997                  */
 998                 usb_gadget_unmap_request(&dwc->gadget, &req->request,
 999                                 req->direction);
1000                 list_del(&req->list);
1001                 return ret;
1002         }
1003
1004         dep->flags |= DWC3_EP_BUSY;
1005
1006         if (start_new) {
1007                 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
1008                                 dep->number);
1009                 WARN_ON_ONCE(!dep->resource_index);
1010         }
1011
1012         return 0;
1013 }
1014
1015 static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
1016                 struct dwc3_ep *dep, u32 cur_uf)
1017 {
1018         u32 uf;
1019
1020         if (list_empty(&dep->request_list)) {
1021                 dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n",
1022                         dep->name);
1023                 dep->flags |= DWC3_EP_PENDING_REQUEST;
1024                 return;
1025         }
1026
1027         /* 4 micro frames in the future */
1028         uf = cur_uf + dep->interval * 4;
1029
1030         __dwc3_gadget_kick_transfer(dep, uf, 1);
1031 }
1032
1033 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1034                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1035 {
1036         u32 cur_uf, mask;
1037
1038         mask = ~(dep->interval - 1);
1039         cur_uf = event->parameters & mask;
1040
1041         __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1042 }
1043
1044 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1045 {
1046         struct dwc3             *dwc = dep->dwc;
1047         int                     ret;
1048
1049         req->request.actual     = 0;
1050         req->request.status     = -EINPROGRESS;
1051         req->direction          = dep->direction;
1052         req->epnum              = dep->number;
1053
1054         /*
1055          * We only add to our list of requests now and
1056          * start consuming the list once we get XferNotReady
1057          * IRQ.
1058          *
1059          * That way, we avoid doing anything that we don't need
1060          * to do now and defer it until the point we receive a
1061          * particular token from the Host side.
1062          *
1063          * This will also avoid Host cancelling URBs due to too
1064          * many NAKs.
1065          */
1066         ret = usb_gadget_map_request(&dwc->gadget, &req->request,
1067                         dep->direction);
1068         if (ret)
1069                 return ret;
1070
1071         list_add_tail(&req->list, &dep->request_list);
1072
1073         /*
1074          * There are a few special cases:
1075          *
1076          * 1. XferNotReady with empty list of requests. We need to kick the
1077          *    transfer here in that situation, otherwise we will be NAKing
1078          *    forever. If we get XferNotReady before gadget driver has a
1079          *    chance to queue a request, we will ACK the IRQ but won't be
1080          *    able to receive the data until the next request is queued.
1081          *    The following code is handling exactly that.
1082          *
1083          */
1084         if (dep->flags & DWC3_EP_PENDING_REQUEST) {
1085                 int     ret;
1086
1087                 /*
1088                  * If xfernotready is already elapsed and it is a case
1089                  * of isoc transfer, then issue END TRANSFER, so that
1090                  * you can receive xfernotready again and can have
1091                  * notion of current microframe.
1092                  */
1093                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1094                         dwc3_stop_active_transfer(dwc, dep->number);
1095                         return 0;
1096                 }
1097
1098                 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1099                 if (ret && ret != -EBUSY)
1100                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1101                                         dep->name);
1102         }
1103
1104         /*
1105          * 2. XferInProgress on Isoc EP with an active transfer. We need to
1106          *    kick the transfer here after queuing a request, otherwise the
1107          *    core may not see the modified TRB(s).
1108          */
1109         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1110                         (dep->flags & DWC3_EP_BUSY) &&
1111                         !(dep->flags & DWC3_EP_MISSED_ISOC)) {
1112                 WARN_ON_ONCE(!dep->resource_index);
1113                 ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index,
1114                                 false);
1115                 if (ret && ret != -EBUSY)
1116                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1117                                         dep->name);
1118         }
1119
1120         /*
1121          * 3. Missed ISOC Handling. We need to start isoc transfer on the saved
1122          * uframe number.
1123          */
1124         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1125                 (dep->flags & DWC3_EP_MISSED_ISOC)) {
1126                         __dwc3_gadget_start_isoc(dwc, dep, dep->current_uf);
1127                         dep->flags &= ~DWC3_EP_MISSED_ISOC;
1128         }
1129
1130         return 0;
1131 }
1132
1133 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1134         gfp_t gfp_flags)
1135 {
1136         struct dwc3_request             *req = to_dwc3_request(request);
1137         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1138         struct dwc3                     *dwc = dep->dwc;
1139
1140         unsigned long                   flags;
1141
1142         int                             ret;
1143
1144         if (!dep->endpoint.desc) {
1145                 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
1146                                 request, ep->name);
1147                 return -ESHUTDOWN;
1148         }
1149
1150         dev_vdbg(dwc->dev, "queing request %p to %s length %d\n",
1151                         request, ep->name, request->length);
1152
1153         spin_lock_irqsave(&dwc->lock, flags);
1154         ret = __dwc3_gadget_ep_queue(dep, req);
1155         spin_unlock_irqrestore(&dwc->lock, flags);
1156
1157         return ret;
1158 }
1159
1160 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1161                 struct usb_request *request)
1162 {
1163         struct dwc3_request             *req = to_dwc3_request(request);
1164         struct dwc3_request             *r = NULL;
1165
1166         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1167         struct dwc3                     *dwc = dep->dwc;
1168
1169         unsigned long                   flags;
1170         int                             ret = 0;
1171
1172         spin_lock_irqsave(&dwc->lock, flags);
1173
1174         list_for_each_entry(r, &dep->request_list, list) {
1175                 if (r == req)
1176                         break;
1177         }
1178
1179         if (r != req) {
1180                 list_for_each_entry(r, &dep->req_queued, list) {
1181                         if (r == req)
1182                                 break;
1183                 }
1184                 if (r == req) {
1185                         /* wait until it is processed */
1186                         dwc3_stop_active_transfer(dwc, dep->number);
1187                         goto out1;
1188                 }
1189                 dev_err(dwc->dev, "request %p was not queued to %s\n",
1190                                 request, ep->name);
1191                 ret = -EINVAL;
1192                 goto out0;
1193         }
1194
1195 out1:
1196         /* giveback the request */
1197         dwc3_gadget_giveback(dep, req, -ECONNRESET);
1198
1199 out0:
1200         spin_unlock_irqrestore(&dwc->lock, flags);
1201
1202         return ret;
1203 }
1204
1205 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
1206 {
1207         struct dwc3_gadget_ep_cmd_params        params;
1208         struct dwc3                             *dwc = dep->dwc;
1209         int                                     ret;
1210
1211         memset(&params, 0x00, sizeof(params));
1212
1213         if (value) {
1214                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1215                         DWC3_DEPCMD_SETSTALL, &params);
1216                 if (ret)
1217                         dev_err(dwc->dev, "failed to %s STALL on %s\n",
1218                                         value ? "set" : "clear",
1219                                         dep->name);
1220                 else
1221                         dep->flags |= DWC3_EP_STALL;
1222         } else {
1223                 if (dep->flags & DWC3_EP_WEDGE)
1224                         return 0;
1225
1226                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1227                         DWC3_DEPCMD_CLEARSTALL, &params);
1228                 if (ret)
1229                         dev_err(dwc->dev, "failed to %s STALL on %s\n",
1230                                         value ? "set" : "clear",
1231                                         dep->name);
1232                 else
1233                         dep->flags &= ~DWC3_EP_STALL;
1234         }
1235
1236         return ret;
1237 }
1238
1239 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1240 {
1241         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1242         struct dwc3                     *dwc = dep->dwc;
1243
1244         unsigned long                   flags;
1245
1246         int                             ret;
1247
1248         spin_lock_irqsave(&dwc->lock, flags);
1249
1250         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1251                 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1252                 ret = -EINVAL;
1253                 goto out;
1254         }
1255
1256         ret = __dwc3_gadget_ep_set_halt(dep, value);
1257 out:
1258         spin_unlock_irqrestore(&dwc->lock, flags);
1259
1260         return ret;
1261 }
1262
1263 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1264 {
1265         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1266         struct dwc3                     *dwc = dep->dwc;
1267         unsigned long                   flags;
1268
1269         spin_lock_irqsave(&dwc->lock, flags);
1270         dep->flags |= DWC3_EP_WEDGE;
1271         spin_unlock_irqrestore(&dwc->lock, flags);
1272
1273         if (dep->number == 0 || dep->number == 1)
1274                 return dwc3_gadget_ep0_set_halt(ep, 1);
1275         else
1276                 return dwc3_gadget_ep_set_halt(ep, 1);
1277 }
1278
1279 /* -------------------------------------------------------------------------- */
1280
1281 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1282         .bLength        = USB_DT_ENDPOINT_SIZE,
1283         .bDescriptorType = USB_DT_ENDPOINT,
1284         .bmAttributes   = USB_ENDPOINT_XFER_CONTROL,
1285 };
1286
1287 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1288         .enable         = dwc3_gadget_ep0_enable,
1289         .disable        = dwc3_gadget_ep0_disable,
1290         .alloc_request  = dwc3_gadget_ep_alloc_request,
1291         .free_request   = dwc3_gadget_ep_free_request,
1292         .queue          = dwc3_gadget_ep0_queue,
1293         .dequeue        = dwc3_gadget_ep_dequeue,
1294         .set_halt       = dwc3_gadget_ep0_set_halt,
1295         .set_wedge      = dwc3_gadget_ep_set_wedge,
1296 };
1297
1298 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1299         .enable         = dwc3_gadget_ep_enable,
1300         .disable        = dwc3_gadget_ep_disable,
1301         .alloc_request  = dwc3_gadget_ep_alloc_request,
1302         .free_request   = dwc3_gadget_ep_free_request,
1303         .queue          = dwc3_gadget_ep_queue,
1304         .dequeue        = dwc3_gadget_ep_dequeue,
1305         .set_halt       = dwc3_gadget_ep_set_halt,
1306         .set_wedge      = dwc3_gadget_ep_set_wedge,
1307 };
1308
1309 /* -------------------------------------------------------------------------- */
1310
1311 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1312 {
1313         struct dwc3             *dwc = gadget_to_dwc(g);
1314         u32                     reg;
1315
1316         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1317         return DWC3_DSTS_SOFFN(reg);
1318 }
1319
1320 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1321 {
1322         struct dwc3             *dwc = gadget_to_dwc(g);
1323
1324         unsigned long           timeout;
1325         unsigned long           flags;
1326
1327         u32                     reg;
1328
1329         int                     ret = 0;
1330
1331         u8                      link_state;
1332         u8                      speed;
1333
1334         spin_lock_irqsave(&dwc->lock, flags);
1335
1336         /*
1337          * According to the Databook Remote wakeup request should
1338          * be issued only when the device is in early suspend state.
1339          *
1340          * We can check that via USB Link State bits in DSTS register.
1341          */
1342         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1343
1344         speed = reg & DWC3_DSTS_CONNECTSPD;
1345         if (speed == DWC3_DSTS_SUPERSPEED) {
1346                 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n");
1347                 ret = -EINVAL;
1348                 goto out;
1349         }
1350
1351         link_state = DWC3_DSTS_USBLNKST(reg);
1352
1353         switch (link_state) {
1354         case DWC3_LINK_STATE_RX_DET:    /* in HS, means Early Suspend */
1355         case DWC3_LINK_STATE_U3:        /* in HS, means SUSPEND */
1356                 break;
1357         default:
1358                 dev_dbg(dwc->dev, "can't wakeup from link state %d\n",
1359                                 link_state);
1360                 ret = -EINVAL;
1361                 goto out;
1362         }
1363
1364         ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1365         if (ret < 0) {
1366                 dev_err(dwc->dev, "failed to put link in Recovery\n");
1367                 goto out;
1368         }
1369
1370         /* Recent versions do this automatically */
1371         if (dwc->revision < DWC3_REVISION_194A) {
1372                 /* write zeroes to Link Change Request */
1373                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1374                 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1375                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1376         }
1377
1378         /* poll until Link State changes to ON */
1379         timeout = jiffies + msecs_to_jiffies(100);
1380
1381         while (!time_after(jiffies, timeout)) {
1382                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1383
1384                 /* in HS, means ON */
1385                 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1386                         break;
1387         }
1388
1389         if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1390                 dev_err(dwc->dev, "failed to send remote wakeup\n");
1391                 ret = -EINVAL;
1392         }
1393
1394 out:
1395         spin_unlock_irqrestore(&dwc->lock, flags);
1396
1397         return ret;
1398 }
1399
1400 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1401                 int is_selfpowered)
1402 {
1403         struct dwc3             *dwc = gadget_to_dwc(g);
1404         unsigned long           flags;
1405
1406         spin_lock_irqsave(&dwc->lock, flags);
1407         dwc->is_selfpowered = !!is_selfpowered;
1408         spin_unlock_irqrestore(&dwc->lock, flags);
1409
1410         return 0;
1411 }
1412
1413 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on)
1414 {
1415         u32                     reg;
1416         u32                     timeout = 500;
1417
1418         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1419         if (is_on) {
1420                 if (dwc->revision <= DWC3_REVISION_187A) {
1421                         reg &= ~DWC3_DCTL_TRGTULST_MASK;
1422                         reg |= DWC3_DCTL_TRGTULST_RX_DET;
1423                 }
1424
1425                 if (dwc->revision >= DWC3_REVISION_194A)
1426                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1427                 reg |= DWC3_DCTL_RUN_STOP;
1428         } else {
1429                 reg &= ~DWC3_DCTL_RUN_STOP;
1430         }
1431
1432         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1433
1434         do {
1435                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1436                 if (is_on) {
1437                         if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1438                                 break;
1439                 } else {
1440                         if (reg & DWC3_DSTS_DEVCTRLHLT)
1441                                 break;
1442                 }
1443                 timeout--;
1444                 if (!timeout)
1445                         return -ETIMEDOUT;
1446                 udelay(1);
1447         } while (1);
1448
1449         dev_vdbg(dwc->dev, "gadget %s data soft-%s\n",
1450                         dwc->gadget_driver
1451                         ? dwc->gadget_driver->function : "no-function",
1452                         is_on ? "connect" : "disconnect");
1453
1454         return 0;
1455 }
1456
1457 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1458 {
1459         struct dwc3             *dwc = gadget_to_dwc(g);
1460         unsigned long           flags;
1461         int                     ret;
1462
1463         is_on = !!is_on;
1464
1465         spin_lock_irqsave(&dwc->lock, flags);
1466         ret = dwc3_gadget_run_stop(dwc, is_on);
1467         spin_unlock_irqrestore(&dwc->lock, flags);
1468
1469         return ret;
1470 }
1471
1472 static int dwc3_gadget_start(struct usb_gadget *g,
1473                 struct usb_gadget_driver *driver)
1474 {
1475         struct dwc3             *dwc = gadget_to_dwc(g);
1476         struct dwc3_ep          *dep;
1477         unsigned long           flags;
1478         int                     ret = 0;
1479         u32                     reg;
1480
1481         spin_lock_irqsave(&dwc->lock, flags);
1482
1483         if (dwc->gadget_driver) {
1484                 dev_err(dwc->dev, "%s is already bound to %s\n",
1485                                 dwc->gadget.name,
1486                                 dwc->gadget_driver->driver.name);
1487                 ret = -EBUSY;
1488                 goto err0;
1489         }
1490
1491         dwc->gadget_driver      = driver;
1492         dwc->gadget.dev.driver  = &driver->driver;
1493
1494         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1495         reg &= ~(DWC3_DCFG_SPEED_MASK);
1496
1497         /**
1498          * WORKAROUND: DWC3 revision < 2.20a have an issue
1499          * which would cause metastability state on Run/Stop
1500          * bit if we try to force the IP to USB2-only mode.
1501          *
1502          * Because of that, we cannot configure the IP to any
1503          * speed other than the SuperSpeed
1504          *
1505          * Refers to:
1506          *
1507          * STAR#9000525659: Clock Domain Crossing on DCTL in
1508          * USB 2.0 Mode
1509          */
1510         if (dwc->revision < DWC3_REVISION_220A)
1511                 reg |= DWC3_DCFG_SUPERSPEED;
1512         else
1513                 reg |= dwc->maximum_speed;
1514         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1515
1516         dwc->start_config_issued = false;
1517
1518         /* Start with SuperSpeed Default */
1519         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1520
1521         dep = dwc->eps[0];
1522         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
1523         if (ret) {
1524                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1525                 goto err0;
1526         }
1527
1528         dep = dwc->eps[1];
1529         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
1530         if (ret) {
1531                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1532                 goto err1;
1533         }
1534
1535         /* begin to receive SETUP packets */
1536         dwc->ep0state = EP0_SETUP_PHASE;
1537         dwc3_ep0_out_start(dwc);
1538
1539         spin_unlock_irqrestore(&dwc->lock, flags);
1540
1541         return 0;
1542
1543 err1:
1544         __dwc3_gadget_ep_disable(dwc->eps[0]);
1545
1546 err0:
1547         spin_unlock_irqrestore(&dwc->lock, flags);
1548
1549         return ret;
1550 }
1551
1552 static int dwc3_gadget_stop(struct usb_gadget *g,
1553                 struct usb_gadget_driver *driver)
1554 {
1555         struct dwc3             *dwc = gadget_to_dwc(g);
1556         unsigned long           flags;
1557
1558         spin_lock_irqsave(&dwc->lock, flags);
1559
1560         __dwc3_gadget_ep_disable(dwc->eps[0]);
1561         __dwc3_gadget_ep_disable(dwc->eps[1]);
1562
1563         dwc->gadget_driver      = NULL;
1564         dwc->gadget.dev.driver  = NULL;
1565
1566         spin_unlock_irqrestore(&dwc->lock, flags);
1567
1568         return 0;
1569 }
1570
1571 static const struct usb_gadget_ops dwc3_gadget_ops = {
1572         .get_frame              = dwc3_gadget_get_frame,
1573         .wakeup                 = dwc3_gadget_wakeup,
1574         .set_selfpowered        = dwc3_gadget_set_selfpowered,
1575         .pullup                 = dwc3_gadget_pullup,
1576         .udc_start              = dwc3_gadget_start,
1577         .udc_stop               = dwc3_gadget_stop,
1578 };
1579
1580 /* -------------------------------------------------------------------------- */
1581
1582 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1583 {
1584         struct dwc3_ep                  *dep;
1585         u8                              epnum;
1586
1587         INIT_LIST_HEAD(&dwc->gadget.ep_list);
1588
1589         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1590                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1591                 if (!dep) {
1592                         dev_err(dwc->dev, "can't allocate endpoint %d\n",
1593                                         epnum);
1594                         return -ENOMEM;
1595                 }
1596
1597                 dep->dwc = dwc;
1598                 dep->number = epnum;
1599                 dwc->eps[epnum] = dep;
1600
1601                 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1602                                 (epnum & 1) ? "in" : "out");
1603                 dep->endpoint.name = dep->name;
1604                 dep->direction = (epnum & 1);
1605
1606                 if (epnum == 0 || epnum == 1) {
1607                         dep->endpoint.maxpacket = 512;
1608                         dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1609                         if (!epnum)
1610                                 dwc->gadget.ep0 = &dep->endpoint;
1611                 } else {
1612                         int             ret;
1613
1614                         dep->endpoint.maxpacket = 1024;
1615                         dep->endpoint.max_streams = 15;
1616                         dep->endpoint.ops = &dwc3_gadget_ep_ops;
1617                         list_add_tail(&dep->endpoint.ep_list,
1618                                         &dwc->gadget.ep_list);
1619
1620                         ret = dwc3_alloc_trb_pool(dep);
1621                         if (ret)
1622                                 return ret;
1623                 }
1624
1625                 INIT_LIST_HEAD(&dep->request_list);
1626                 INIT_LIST_HEAD(&dep->req_queued);
1627         }
1628
1629         return 0;
1630 }
1631
1632 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1633 {
1634         struct dwc3_ep                  *dep;
1635         u8                              epnum;
1636
1637         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1638                 dep = dwc->eps[epnum];
1639                 dwc3_free_trb_pool(dep);
1640
1641                 if (epnum != 0 && epnum != 1)
1642                         list_del(&dep->endpoint.ep_list);
1643
1644                 kfree(dep);
1645         }
1646 }
1647
1648 static void dwc3_gadget_release(struct device *dev)
1649 {
1650         dev_dbg(dev, "%s\n", __func__);
1651 }
1652
1653 /* -------------------------------------------------------------------------- */
1654 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1655                 const struct dwc3_event_depevt *event, int status)
1656 {
1657         struct dwc3_request     *req;
1658         struct dwc3_trb         *trb;
1659         unsigned int            count;
1660         unsigned int            s_pkt = 0;
1661         unsigned int            trb_status;
1662
1663         do {
1664                 req = next_request(&dep->req_queued);
1665                 if (!req) {
1666                         WARN_ON_ONCE(1);
1667                         return 1;
1668                 }
1669
1670                 trb = req->trb;
1671
1672                 if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
1673                         /*
1674                          * We continue despite the error. There is not much we
1675                          * can do. If we don't clean it up we loop forever. If
1676                          * we skip the TRB then it gets overwritten after a
1677                          * while since we use them in a ring buffer. A BUG()
1678                          * would help. Lets hope that if this occurs, someone
1679                          * fixes the root cause instead of looking away :)
1680                          */
1681                         dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1682                                         dep->name, req->trb);
1683                 count = trb->size & DWC3_TRB_SIZE_MASK;
1684
1685                 if (dep->direction) {
1686                         if (count) {
1687                                 trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
1688                                 if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
1689                                         dev_dbg(dwc->dev, "incomplete IN transfer %s\n",
1690                                                         dep->name);
1691                                         dep->current_uf = event->parameters &
1692                                                 ~(dep->interval - 1);
1693                                         dep->flags |= DWC3_EP_MISSED_ISOC;
1694                                 } else {
1695                                         dev_err(dwc->dev, "incomplete IN transfer %s\n",
1696                                                         dep->name);
1697                                         status = -ECONNRESET;
1698                                 }
1699                         }
1700                 } else {
1701                         if (count && (event->status & DEPEVT_STATUS_SHORT))
1702                                 s_pkt = 1;
1703                 }
1704
1705                 /*
1706                  * We assume here we will always receive the entire data block
1707                  * which we should receive. Meaning, if we program RX to
1708                  * receive 4K but we receive only 2K, we assume that's all we
1709                  * should receive and we simply bounce the request back to the
1710                  * gadget driver for further processing.
1711                  */
1712                 req->request.actual += req->request.length - count;
1713                 dwc3_gadget_giveback(dep, req, status);
1714                 if (s_pkt)
1715                         break;
1716                 if ((event->status & DEPEVT_STATUS_LST) &&
1717                                 (trb->ctrl & (DWC3_TRB_CTRL_LST |
1718                                                 DWC3_TRB_CTRL_HWO)))
1719                         break;
1720                 if ((event->status & DEPEVT_STATUS_IOC) &&
1721                                 (trb->ctrl & DWC3_TRB_CTRL_IOC))
1722                         break;
1723         } while (1);
1724
1725         if ((event->status & DEPEVT_STATUS_IOC) &&
1726                         (trb->ctrl & DWC3_TRB_CTRL_IOC))
1727                 return 0;
1728         return 1;
1729 }
1730
1731 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
1732                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event,
1733                 int start_new)
1734 {
1735         unsigned                status = 0;
1736         int                     clean_busy;
1737
1738         if (event->status & DEPEVT_STATUS_BUSERR)
1739                 status = -ECONNRESET;
1740
1741         clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
1742         if (clean_busy)
1743                 dep->flags &= ~DWC3_EP_BUSY;
1744
1745         /*
1746          * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
1747          * See dwc3_gadget_linksts_change_interrupt() for 1st half.
1748          */
1749         if (dwc->revision < DWC3_REVISION_183A) {
1750                 u32             reg;
1751                 int             i;
1752
1753                 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
1754                         dep = dwc->eps[i];
1755
1756                         if (!(dep->flags & DWC3_EP_ENABLED))
1757                                 continue;
1758
1759                         if (!list_empty(&dep->req_queued))
1760                                 return;
1761                 }
1762
1763                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1764                 reg |= dwc->u1u2;
1765                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1766
1767                 dwc->u1u2 = 0;
1768         }
1769 }
1770
1771 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
1772                 const struct dwc3_event_depevt *event)
1773 {
1774         struct dwc3_ep          *dep;
1775         u8                      epnum = event->endpoint_number;
1776
1777         dep = dwc->eps[epnum];
1778
1779         if (!(dep->flags & DWC3_EP_ENABLED))
1780                 return;
1781
1782         dev_vdbg(dwc->dev, "%s: %s\n", dep->name,
1783                         dwc3_ep_event_string(event->endpoint_event));
1784
1785         if (epnum == 0 || epnum == 1) {
1786                 dwc3_ep0_interrupt(dwc, event);
1787                 return;
1788         }
1789
1790         switch (event->endpoint_event) {
1791         case DWC3_DEPEVT_XFERCOMPLETE:
1792                 dep->resource_index = 0;
1793
1794                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1795                         dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n",
1796                                         dep->name);
1797                         return;
1798                 }
1799
1800                 dwc3_endpoint_transfer_complete(dwc, dep, event, 1);
1801                 break;
1802         case DWC3_DEPEVT_XFERINPROGRESS:
1803                 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1804                         dev_dbg(dwc->dev, "%s is not an Isochronous endpoint\n",
1805                                         dep->name);
1806                         return;
1807                 }
1808
1809                 dwc3_endpoint_transfer_complete(dwc, dep, event, 0);
1810                 break;
1811         case DWC3_DEPEVT_XFERNOTREADY:
1812                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1813                         dwc3_gadget_start_isoc(dwc, dep, event);
1814                 } else {
1815                         int ret;
1816
1817                         dev_vdbg(dwc->dev, "%s: reason %s\n",
1818                                         dep->name, event->status &
1819                                         DEPEVT_STATUS_TRANSFER_ACTIVE
1820                                         ? "Transfer Active"
1821                                         : "Transfer Not Active");
1822
1823                         ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
1824                         if (!ret || ret == -EBUSY)
1825                                 return;
1826
1827                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1828                                         dep->name);
1829                 }
1830
1831                 break;
1832         case DWC3_DEPEVT_STREAMEVT:
1833                 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
1834                         dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
1835                                         dep->name);
1836                         return;
1837                 }
1838
1839                 switch (event->status) {
1840                 case DEPEVT_STREAMEVT_FOUND:
1841                         dev_vdbg(dwc->dev, "Stream %d found and started\n",
1842                                         event->parameters);
1843
1844                         break;
1845                 case DEPEVT_STREAMEVT_NOTFOUND:
1846                         /* FALLTHROUGH */
1847                 default:
1848                         dev_dbg(dwc->dev, "Couldn't find suitable stream\n");
1849                 }
1850                 break;
1851         case DWC3_DEPEVT_RXTXFIFOEVT:
1852                 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name);
1853                 break;
1854         case DWC3_DEPEVT_EPCMDCMPLT:
1855                 dev_vdbg(dwc->dev, "Endpoint Command Complete\n");
1856                 break;
1857         }
1858 }
1859
1860 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
1861 {
1862         if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
1863                 spin_unlock(&dwc->lock);
1864                 dwc->gadget_driver->disconnect(&dwc->gadget);
1865                 spin_lock(&dwc->lock);
1866         }
1867 }
1868
1869 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum)
1870 {
1871         struct dwc3_ep *dep;
1872         struct dwc3_gadget_ep_cmd_params params;
1873         u32 cmd;
1874         int ret;
1875
1876         dep = dwc->eps[epnum];
1877
1878         if (!dep->resource_index)
1879                 return;
1880
1881         /*
1882          * NOTICE: We are violating what the Databook says about the
1883          * EndTransfer command. Ideally we would _always_ wait for the
1884          * EndTransfer Command Completion IRQ, but that's causing too
1885          * much trouble synchronizing between us and gadget driver.
1886          *
1887          * We have discussed this with the IP Provider and it was
1888          * suggested to giveback all requests here, but give HW some
1889          * extra time to synchronize with the interconnect. We're using
1890          * an arbitraty 100us delay for that.
1891          *
1892          * Note also that a similar handling was tested by Synopsys
1893          * (thanks a lot Paul) and nothing bad has come out of it.
1894          * In short, what we're doing is:
1895          *
1896          * - Issue EndTransfer WITH CMDIOC bit set
1897          * - Wait 100us
1898          */
1899
1900         cmd = DWC3_DEPCMD_ENDTRANSFER;
1901         cmd |= DWC3_DEPCMD_HIPRI_FORCERM | DWC3_DEPCMD_CMDIOC;
1902         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1903         memset(&params, 0, sizeof(params));
1904         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
1905         WARN_ON_ONCE(ret);
1906         dep->resource_index = 0;
1907         dep->flags &= ~DWC3_EP_BUSY;
1908         udelay(100);
1909 }
1910
1911 static void dwc3_stop_active_transfers(struct dwc3 *dwc)
1912 {
1913         u32 epnum;
1914
1915         for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1916                 struct dwc3_ep *dep;
1917
1918                 dep = dwc->eps[epnum];
1919                 if (!(dep->flags & DWC3_EP_ENABLED))
1920                         continue;
1921
1922                 dwc3_remove_requests(dwc, dep);
1923         }
1924 }
1925
1926 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
1927 {
1928         u32 epnum;
1929
1930         for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1931                 struct dwc3_ep *dep;
1932                 struct dwc3_gadget_ep_cmd_params params;
1933                 int ret;
1934
1935                 dep = dwc->eps[epnum];
1936
1937                 if (!(dep->flags & DWC3_EP_STALL))
1938                         continue;
1939
1940                 dep->flags &= ~DWC3_EP_STALL;
1941
1942                 memset(&params, 0, sizeof(params));
1943                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1944                                 DWC3_DEPCMD_CLEARSTALL, &params);
1945                 WARN_ON_ONCE(ret);
1946         }
1947 }
1948
1949 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
1950 {
1951         int                     reg;
1952
1953         dev_vdbg(dwc->dev, "%s\n", __func__);
1954
1955         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1956         reg &= ~DWC3_DCTL_INITU1ENA;
1957         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1958
1959         reg &= ~DWC3_DCTL_INITU2ENA;
1960         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1961
1962         dwc3_disconnect_gadget(dwc);
1963         dwc->start_config_issued = false;
1964
1965         dwc->gadget.speed = USB_SPEED_UNKNOWN;
1966         dwc->setup_packet_pending = false;
1967 }
1968
1969 static void dwc3_gadget_usb3_phy_suspend(struct dwc3 *dwc, int suspend)
1970 {
1971         u32                     reg;
1972
1973         reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
1974
1975         if (suspend)
1976                 reg |= DWC3_GUSB3PIPECTL_SUSPHY;
1977         else
1978                 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
1979
1980         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
1981 }
1982
1983 static void dwc3_gadget_usb2_phy_suspend(struct dwc3 *dwc, int suspend)
1984 {
1985         u32                     reg;
1986
1987         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
1988
1989         if (suspend)
1990                 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
1991         else
1992                 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
1993
1994         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
1995 }
1996
1997 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
1998 {
1999         u32                     reg;
2000
2001         dev_vdbg(dwc->dev, "%s\n", __func__);
2002
2003         /*
2004          * WORKAROUND: DWC3 revisions <1.88a have an issue which
2005          * would cause a missing Disconnect Event if there's a
2006          * pending Setup Packet in the FIFO.
2007          *
2008          * There's no suggested workaround on the official Bug
2009          * report, which states that "unless the driver/application
2010          * is doing any special handling of a disconnect event,
2011          * there is no functional issue".
2012          *
2013          * Unfortunately, it turns out that we _do_ some special
2014          * handling of a disconnect event, namely complete all
2015          * pending transfers, notify gadget driver of the
2016          * disconnection, and so on.
2017          *
2018          * Our suggested workaround is to follow the Disconnect
2019          * Event steps here, instead, based on a setup_packet_pending
2020          * flag. Such flag gets set whenever we have a XferNotReady
2021          * event on EP0 and gets cleared on XferComplete for the
2022          * same endpoint.
2023          *
2024          * Refers to:
2025          *
2026          * STAR#9000466709: RTL: Device : Disconnect event not
2027          * generated if setup packet pending in FIFO
2028          */
2029         if (dwc->revision < DWC3_REVISION_188A) {
2030                 if (dwc->setup_packet_pending)
2031                         dwc3_gadget_disconnect_interrupt(dwc);
2032         }
2033
2034         /* after reset -> Default State */
2035         dwc->dev_state = DWC3_DEFAULT_STATE;
2036
2037         /* Recent versions support automatic phy suspend and don't need this */
2038         if (dwc->revision < DWC3_REVISION_194A) {
2039                 /* Resume PHYs */
2040                 dwc3_gadget_usb2_phy_suspend(dwc, false);
2041                 dwc3_gadget_usb3_phy_suspend(dwc, false);
2042         }
2043
2044         if (dwc->gadget.speed != USB_SPEED_UNKNOWN)
2045                 dwc3_disconnect_gadget(dwc);
2046
2047         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2048         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2049         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2050         dwc->test_mode = false;
2051
2052         dwc3_stop_active_transfers(dwc);
2053         dwc3_clear_stall_all_ep(dwc);
2054         dwc->start_config_issued = false;
2055
2056         /* Reset device address to zero */
2057         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2058         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2059         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2060 }
2061
2062 static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
2063 {
2064         u32 reg;
2065         u32 usb30_clock = DWC3_GCTL_CLK_BUS;
2066
2067         /*
2068          * We change the clock only at SS but I dunno why I would want to do
2069          * this. Maybe it becomes part of the power saving plan.
2070          */
2071
2072         if (speed != DWC3_DSTS_SUPERSPEED)
2073                 return;
2074
2075         /*
2076          * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2077          * each time on Connect Done.
2078          */
2079         if (!usb30_clock)
2080                 return;
2081
2082         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
2083         reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
2084         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
2085 }
2086
2087 static void dwc3_gadget_phy_suspend(struct dwc3 *dwc, u8 speed)
2088 {
2089         switch (speed) {
2090         case USB_SPEED_SUPER:
2091                 dwc3_gadget_usb2_phy_suspend(dwc, true);
2092                 break;
2093         case USB_SPEED_HIGH:
2094         case USB_SPEED_FULL:
2095         case USB_SPEED_LOW:
2096                 dwc3_gadget_usb3_phy_suspend(dwc, true);
2097                 break;
2098         }
2099 }
2100
2101 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2102 {
2103         struct dwc3_gadget_ep_cmd_params params;
2104         struct dwc3_ep          *dep;
2105         int                     ret;
2106         u32                     reg;
2107         u8                      speed;
2108
2109         dev_vdbg(dwc->dev, "%s\n", __func__);
2110
2111         memset(&params, 0x00, sizeof(params));
2112
2113         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2114         speed = reg & DWC3_DSTS_CONNECTSPD;
2115         dwc->speed = speed;
2116
2117         dwc3_update_ram_clk_sel(dwc, speed);
2118
2119         switch (speed) {
2120         case DWC3_DCFG_SUPERSPEED:
2121                 /*
2122                  * WORKAROUND: DWC3 revisions <1.90a have an issue which
2123                  * would cause a missing USB3 Reset event.
2124                  *
2125                  * In such situations, we should force a USB3 Reset
2126                  * event by calling our dwc3_gadget_reset_interrupt()
2127                  * routine.
2128                  *
2129                  * Refers to:
2130                  *
2131                  * STAR#9000483510: RTL: SS : USB3 reset event may
2132                  * not be generated always when the link enters poll
2133                  */
2134                 if (dwc->revision < DWC3_REVISION_190A)
2135                         dwc3_gadget_reset_interrupt(dwc);
2136
2137                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2138                 dwc->gadget.ep0->maxpacket = 512;
2139                 dwc->gadget.speed = USB_SPEED_SUPER;
2140                 break;
2141         case DWC3_DCFG_HIGHSPEED:
2142                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2143                 dwc->gadget.ep0->maxpacket = 64;
2144                 dwc->gadget.speed = USB_SPEED_HIGH;
2145                 break;
2146         case DWC3_DCFG_FULLSPEED2:
2147         case DWC3_DCFG_FULLSPEED1:
2148                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2149                 dwc->gadget.ep0->maxpacket = 64;
2150                 dwc->gadget.speed = USB_SPEED_FULL;
2151                 break;
2152         case DWC3_DCFG_LOWSPEED:
2153                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2154                 dwc->gadget.ep0->maxpacket = 8;
2155                 dwc->gadget.speed = USB_SPEED_LOW;
2156                 break;
2157         }
2158
2159         /* Recent versions support automatic phy suspend and don't need this */
2160         if (dwc->revision < DWC3_REVISION_194A) {
2161                 /* Suspend unneeded PHY */
2162                 dwc3_gadget_phy_suspend(dwc, dwc->gadget.speed);
2163         }
2164
2165         dep = dwc->eps[0];
2166         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true);
2167         if (ret) {
2168                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2169                 return;
2170         }
2171
2172         dep = dwc->eps[1];
2173         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true);
2174         if (ret) {
2175                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2176                 return;
2177         }
2178
2179         /*
2180          * Configure PHY via GUSB3PIPECTLn if required.
2181          *
2182          * Update GTXFIFOSIZn
2183          *
2184          * In both cases reset values should be sufficient.
2185          */
2186 }
2187
2188 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2189 {
2190         dev_vdbg(dwc->dev, "%s\n", __func__);
2191
2192         /*
2193          * TODO take core out of low power mode when that's
2194          * implemented.
2195          */
2196
2197         dwc->gadget_driver->resume(&dwc->gadget);
2198 }
2199
2200 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2201                 unsigned int evtinfo)
2202 {
2203         enum dwc3_link_state    next = evtinfo & DWC3_LINK_STATE_MASK;
2204
2205         /*
2206          * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2207          * on the link partner, the USB session might do multiple entry/exit
2208          * of low power states before a transfer takes place.
2209          *
2210          * Due to this problem, we might experience lower throughput. The
2211          * suggested workaround is to disable DCTL[12:9] bits if we're
2212          * transitioning from U1/U2 to U0 and enable those bits again
2213          * after a transfer completes and there are no pending transfers
2214          * on any of the enabled endpoints.
2215          *
2216          * This is the first half of that workaround.
2217          *
2218          * Refers to:
2219          *
2220          * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2221          * core send LGO_Ux entering U0
2222          */
2223         if (dwc->revision < DWC3_REVISION_183A) {
2224                 if (next == DWC3_LINK_STATE_U0) {
2225                         u32     u1u2;
2226                         u32     reg;
2227
2228                         switch (dwc->link_state) {
2229                         case DWC3_LINK_STATE_U1:
2230                         case DWC3_LINK_STATE_U2:
2231                                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2232                                 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2233                                                 | DWC3_DCTL_ACCEPTU2ENA
2234                                                 | DWC3_DCTL_INITU1ENA
2235                                                 | DWC3_DCTL_ACCEPTU1ENA);
2236
2237                                 if (!dwc->u1u2)
2238                                         dwc->u1u2 = reg & u1u2;
2239
2240                                 reg &= ~u1u2;
2241
2242                                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2243                                 break;
2244                         default:
2245                                 /* do nothing */
2246                                 break;
2247                         }
2248                 }
2249         }
2250
2251         dwc->link_state = next;
2252
2253         dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state);
2254 }
2255
2256 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2257                 const struct dwc3_event_devt *event)
2258 {
2259         switch (event->type) {
2260         case DWC3_DEVICE_EVENT_DISCONNECT:
2261                 dwc3_gadget_disconnect_interrupt(dwc);
2262                 break;
2263         case DWC3_DEVICE_EVENT_RESET:
2264                 dwc3_gadget_reset_interrupt(dwc);
2265                 break;
2266         case DWC3_DEVICE_EVENT_CONNECT_DONE:
2267                 dwc3_gadget_conndone_interrupt(dwc);
2268                 break;
2269         case DWC3_DEVICE_EVENT_WAKEUP:
2270                 dwc3_gadget_wakeup_interrupt(dwc);
2271                 break;
2272         case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2273                 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2274                 break;
2275         case DWC3_DEVICE_EVENT_EOPF:
2276                 dev_vdbg(dwc->dev, "End of Periodic Frame\n");
2277                 break;
2278         case DWC3_DEVICE_EVENT_SOF:
2279                 dev_vdbg(dwc->dev, "Start of Periodic Frame\n");
2280                 break;
2281         case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2282                 dev_vdbg(dwc->dev, "Erratic Error\n");
2283                 break;
2284         case DWC3_DEVICE_EVENT_CMD_CMPL:
2285                 dev_vdbg(dwc->dev, "Command Complete\n");
2286                 break;
2287         case DWC3_DEVICE_EVENT_OVERFLOW:
2288                 dev_vdbg(dwc->dev, "Overflow\n");
2289                 break;
2290         default:
2291                 dev_dbg(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2292         }
2293 }
2294
2295 static void dwc3_process_event_entry(struct dwc3 *dwc,
2296                 const union dwc3_event *event)
2297 {
2298         /* Endpoint IRQ, handle it and return early */
2299         if (event->type.is_devspec == 0) {
2300                 /* depevt */
2301                 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2302         }
2303
2304         switch (event->type.type) {
2305         case DWC3_EVENT_TYPE_DEV:
2306                 dwc3_gadget_interrupt(dwc, &event->devt);
2307                 break;
2308         /* REVISIT what to do with Carkit and I2C events ? */
2309         default:
2310                 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2311         }
2312 }
2313
2314 static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
2315 {
2316         struct dwc3_event_buffer *evt;
2317         int left;
2318         u32 count;
2319
2320         count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
2321         count &= DWC3_GEVNTCOUNT_MASK;
2322         if (!count)
2323                 return IRQ_NONE;
2324
2325         evt = dwc->ev_buffs[buf];
2326         left = count;
2327
2328         while (left > 0) {
2329                 union dwc3_event event;
2330
2331                 event.raw = *(u32 *) (evt->buf + evt->lpos);
2332
2333                 dwc3_process_event_entry(dwc, &event);
2334                 /*
2335                  * XXX we wrap around correctly to the next entry as almost all
2336                  * entries are 4 bytes in size. There is one entry which has 12
2337                  * bytes which is a regular entry followed by 8 bytes data. ATM
2338                  * I don't know how things are organized if were get next to the
2339                  * a boundary so I worry about that once we try to handle that.
2340                  */
2341                 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
2342                 left -= 4;
2343
2344                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4);
2345         }
2346
2347         return IRQ_HANDLED;
2348 }
2349
2350 static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
2351 {
2352         struct dwc3                     *dwc = _dwc;
2353         int                             i;
2354         irqreturn_t                     ret = IRQ_NONE;
2355
2356         spin_lock(&dwc->lock);
2357
2358         for (i = 0; i < dwc->num_event_buffers; i++) {
2359                 irqreturn_t status;
2360
2361                 status = dwc3_process_event_buf(dwc, i);
2362                 if (status == IRQ_HANDLED)
2363                         ret = status;
2364         }
2365
2366         spin_unlock(&dwc->lock);
2367
2368         return ret;
2369 }
2370
2371 /**
2372  * dwc3_gadget_init - Initializes gadget related registers
2373  * @dwc: pointer to our controller context structure
2374  *
2375  * Returns 0 on success otherwise negative errno.
2376  */
2377 int dwc3_gadget_init(struct dwc3 *dwc)
2378 {
2379         u32                                     reg;
2380         int                                     ret;
2381         int                                     irq;
2382
2383         dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2384                         &dwc->ctrl_req_addr, GFP_KERNEL);
2385         if (!dwc->ctrl_req) {
2386                 dev_err(dwc->dev, "failed to allocate ctrl request\n");
2387                 ret = -ENOMEM;
2388                 goto err0;
2389         }
2390
2391         dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2392                         &dwc->ep0_trb_addr, GFP_KERNEL);
2393         if (!dwc->ep0_trb) {
2394                 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
2395                 ret = -ENOMEM;
2396                 goto err1;
2397         }
2398
2399         dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
2400         if (!dwc->setup_buf) {
2401                 dev_err(dwc->dev, "failed to allocate setup buffer\n");
2402                 ret = -ENOMEM;
2403                 goto err2;
2404         }
2405
2406         dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
2407                         DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
2408                         GFP_KERNEL);
2409         if (!dwc->ep0_bounce) {
2410                 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
2411                 ret = -ENOMEM;
2412                 goto err3;
2413         }
2414
2415         dev_set_name(&dwc->gadget.dev, "gadget");
2416
2417         dwc->gadget.ops                 = &dwc3_gadget_ops;
2418         dwc->gadget.max_speed           = USB_SPEED_SUPER;
2419         dwc->gadget.speed               = USB_SPEED_UNKNOWN;
2420         dwc->gadget.dev.parent          = dwc->dev;
2421         dwc->gadget.sg_supported        = true;
2422
2423         dma_set_coherent_mask(&dwc->gadget.dev, dwc->dev->coherent_dma_mask);
2424
2425         dwc->gadget.dev.dma_parms       = dwc->dev->dma_parms;
2426         dwc->gadget.dev.dma_mask        = dwc->dev->dma_mask;
2427         dwc->gadget.dev.release         = dwc3_gadget_release;
2428         dwc->gadget.name                = "dwc3-gadget";
2429
2430         /*
2431          * REVISIT: Here we should clear all pending IRQs to be
2432          * sure we're starting from a well known location.
2433          */
2434
2435         ret = dwc3_gadget_init_endpoints(dwc);
2436         if (ret)
2437                 goto err4;
2438
2439         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
2440
2441         ret = request_irq(irq, dwc3_interrupt, IRQF_SHARED,
2442                         "dwc3", dwc);
2443         if (ret) {
2444                 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
2445                                 irq, ret);
2446                 goto err5;
2447         }
2448
2449         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2450         reg |= DWC3_DCFG_LPM_CAP;
2451         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2452
2453         /* Enable all but Start and End of Frame IRQs */
2454         reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
2455                         DWC3_DEVTEN_EVNTOVERFLOWEN |
2456                         DWC3_DEVTEN_CMDCMPLTEN |
2457                         DWC3_DEVTEN_ERRTICERREN |
2458                         DWC3_DEVTEN_WKUPEVTEN |
2459                         DWC3_DEVTEN_ULSTCNGEN |
2460                         DWC3_DEVTEN_CONNECTDONEEN |
2461                         DWC3_DEVTEN_USBRSTEN |
2462                         DWC3_DEVTEN_DISCONNEVTEN);
2463         dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
2464
2465         /* Enable USB2 LPM and automatic phy suspend only on recent versions */
2466         if (dwc->revision >= DWC3_REVISION_194A) {
2467                 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2468                 reg |= DWC3_DCFG_LPM_CAP;
2469                 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2470
2471                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2472                 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2473
2474                 /* TODO: This should be configurable */
2475                 reg |= DWC3_DCTL_HIRD_THRES(28);
2476
2477                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2478
2479                 dwc3_gadget_usb2_phy_suspend(dwc, false);
2480                 dwc3_gadget_usb3_phy_suspend(dwc, false);
2481         }
2482
2483         ret = device_register(&dwc->gadget.dev);
2484         if (ret) {
2485                 dev_err(dwc->dev, "failed to register gadget device\n");
2486                 put_device(&dwc->gadget.dev);
2487                 goto err6;
2488         }
2489
2490         ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
2491         if (ret) {
2492                 dev_err(dwc->dev, "failed to register udc\n");
2493                 goto err7;
2494         }
2495
2496         return 0;
2497
2498 err7:
2499         device_unregister(&dwc->gadget.dev);
2500
2501 err6:
2502         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
2503         free_irq(irq, dwc);
2504
2505 err5:
2506         dwc3_gadget_free_endpoints(dwc);
2507
2508 err4:
2509         dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2510                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
2511
2512 err3:
2513         kfree(dwc->setup_buf);
2514
2515 err2:
2516         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2517                         dwc->ep0_trb, dwc->ep0_trb_addr);
2518
2519 err1:
2520         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2521                         dwc->ctrl_req, dwc->ctrl_req_addr);
2522
2523 err0:
2524         return ret;
2525 }
2526
2527 void dwc3_gadget_exit(struct dwc3 *dwc)
2528 {
2529         int                     irq;
2530
2531         usb_del_gadget_udc(&dwc->gadget);
2532         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
2533
2534         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
2535         free_irq(irq, dwc);
2536
2537         dwc3_gadget_free_endpoints(dwc);
2538
2539         dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2540                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
2541
2542         kfree(dwc->setup_buf);
2543
2544         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2545                         dwc->ep0_trb, dwc->ep0_trb_addr);
2546
2547         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2548                         dwc->ctrl_req, dwc->ctrl_req_addr);
2549
2550         device_unregister(&dwc->gadget.dev);
2551 }