drivers/usb/dwc3/gadget.c

   1 /**
   2  * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
   3  *
   4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Authors: Felipe Balbi <balbi@ti.com>,
   7  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2  of
  11  * the License as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/delay.h>
  21 #include <linux/slab.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27 #include <linux/list.h>
  28 #include <linux/dma-mapping.h>
  29
  30 #include <linux/usb/ch9.h>
  31 #include <linux/usb/gadget.h>
  32
  33 #include "debug.h"
  34 #include "core.h"
  35 #include "gadget.h"
  36 #include "io.h"
  37
  38 /**
  39  * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
  40  * @dwc: pointer to our context structure
  41  * @mode: the mode to set (J, K SE0 NAK, Force Enable)
  42  *
  43  * Caller should take care of locking. This function will
  44  * return 0 on success or -EINVAL if wrong Test Selector
  45  * is passed
  46  */
  47 int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
  48 {
  49         u32             reg;
  50
  51         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
  52         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
  53
  54         switch (mode) {
  55         case TEST_J:
  56         case TEST_K:
  57         case TEST_SE0_NAK:
  58         case TEST_PACKET:
  59         case TEST_FORCE_EN:
  60                 reg |= mode << 1;
  61                 break;
  62         default:
  63                 return -EINVAL;
  64         }
  65
  66         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
  67
  68         return 0;
  69 }
  70
  71 /**
  72  * dwc3_gadget_get_link_state - Gets current state of USB Link
  73  * @dwc: pointer to our context structure
  74  *
  75  * Caller should take care of locking. This function will
  76  * return the link state on success (>= 0) or -ETIMEDOUT.
  77  */
  78 int dwc3_gadget_get_link_state(struct dwc3 *dwc)
  79 {
  80         u32             reg;
  81
  82         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
  83
  84         return DWC3_DSTS_USBLNKST(reg);
  85 }
  86
  87 /**
  88  * dwc3_gadget_set_link_state - Sets USB Link to a particular State
  89  * @dwc: pointer to our context structure
  90  * @state: the state to put link into
  91  *
  92  * Caller should take care of locking. This function will
  93  * return 0 on success or -ETIMEDOUT.
  94  */
  95 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
  96 {
  97         int             retries = 10000;
  98         u32             reg;
  99
 100         /*
 101          * Wait until device controller is ready. Only applies to 1.94a and
 102          * later RTL.
 103          */
 104         if (dwc->revision >= DWC3_REVISION_194A) {
 105                 while (--retries) {
 106                         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 107                         if (reg & DWC3_DSTS_DCNRD)
 108                                 udelay(5);
 109                         else
 110                                 break;
 111                 }
 112
 113                 if (retries <= 0)
 114                         return -ETIMEDOUT;
 115         }
 116
 117         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 118         reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
 119
 120         /* set requested state */
 121         reg |= DWC3_DCTL_ULSTCHNGREQ(state);
 122         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 123
 124         /*
 125          * The following code is racy when called from dwc3_gadget_wakeup,
 126          * and is not needed, at least on newer versions
 127          */
 128         if (dwc->revision >= DWC3_REVISION_194A)
 129                 return 0;
 130
 131         /* wait for a change in DSTS */
 132         retries = 10000;
 133         while (--retries) {
 134                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 135
 136                 if (DWC3_DSTS_USBLNKST(reg) == state)
 137                         return 0;
 138
 139                 udelay(5);
 140         }
 141
 142         dev_vdbg(dwc->dev, "link state change request timed out\n");
 143
 144         return -ETIMEDOUT;
 145 }
 146
 147 /**
 148  * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
 149  * @dwc: pointer to our context structure
 150  *
 151  * This function will a best effort FIFO allocation in order
 152  * to improve FIFO usage and throughput, while still allowing
 153  * us to enable as many endpoints as possible.
 154  *
 155  * Keep in mind that this operation will be highly dependent
 156  * on the configured size for RAM1 - which contains TxFifo -,
 157  * the amount of endpoints enabled on coreConsultant tool, and
 158  * the width of the Master Bus.
 159  *
 160  * In the ideal world, we would always be able to satisfy the
 161  * following equation:
 162  *
 163  * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
 164  * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
 165  *
 166  * Unfortunately, due to many variables that's not always the case.
 167  */
 168 int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
 169 {
 170         int             last_fifo_depth = 0;
 171         int             ram1_depth;
 172         int             fifo_size;
 173         int             mdwidth;
 174         int             num;
 175
 176         if (!dwc->needs_fifo_resize)
 177                 return 0;
 178
 179         ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
 180         mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
 181
 182         /* MDWIDTH is represented in bits, we need it in bytes */
 183         mdwidth >>= 3;
 184
 185         /*
 186          * FIXME For now we will only allocate 1 wMaxPacketSize space
 187          * for each enabled endpoint, later patches will come to
 188          * improve this algorithm so that we better use the internal
 189          * FIFO space
 190          */
 191         for (num = 0; num < dwc->num_in_eps; num++) {
 192                 /* bit0 indicates direction; 1 means IN ep */
 193                 struct dwc3_ep  *dep = dwc->eps[(num << 1) | 1];
 194                 int             mult = 1;
 195                 int             tmp;
 196
 197                 if (!(dep->flags & DWC3_EP_ENABLED))
 198                         continue;
 199
 200                 if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
 201                                 || usb_endpoint_xfer_isoc(dep->endpoint.desc))
 202                         mult = 3;
 203
 204                 /*
 205                  * REVISIT: the following assumes we will always have enough
 206                  * space available on the FIFO RAM for all possible use cases.
 207                  * Make sure that's true somehow and change FIFO allocation
 208                  * accordingly.
 209                  *
 210                  * If we have Bulk or Isochronous endpoints, we want
 211                  * them to be able to be very, very fast. So we're giving
 212                  * those endpoints a fifo_size which is enough for 3 full
 213                  * packets
 214                  */
 215                 tmp = mult * (dep->endpoint.maxpacket + mdwidth);
 216                 tmp += mdwidth;
 217
 218                 fifo_size = DIV_ROUND_UP(tmp, mdwidth);
 219
 220                 fifo_size |= (last_fifo_depth << 16);
 221
 222                 dev_vdbg(dwc->dev, "%s: Fifo Addr %04x Size %d\n",
 223                                 dep->name, last_fifo_depth, fifo_size & 0xffff);
 224
 225                 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num), fifo_size);
 226
 227                 last_fifo_depth += (fifo_size & 0xffff);
 228         }
 229
 230         return 0;
 231 }
 232
 233 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 234                 int status)
 235 {
 236         struct dwc3                     *dwc = dep->dwc;
 237         int                             i;
 238
 239         if (req->queued) {
 240                 i = 0;
 241                 do {
 242                         dep->busy_slot++;
 243                         /*
 244                          * Skip LINK TRB. We can't use req->trb and check for
 245                          * DWC3_TRBCTL_LINK_TRB because it points the TRB we
 246                          * just completed (not the LINK TRB).
 247                          */
 248                         if (((dep->busy_slot & DWC3_TRB_MASK) ==
 249                                 DWC3_TRB_NUM- 1) &&
 250                                 usb_endpoint_xfer_isoc(dep->endpoint.desc))
 251                                 dep->busy_slot++;
 252                 } while(++i < req->request.num_mapped_sgs);
 253                 req->queued = false;
 254         }
 255         list_del(&req->list);
 256         req->trb = NULL;
 257
 258         if (req->request.status == -EINPROGRESS)
 259                 req->request.status = status;
 260
 261         if (dwc->ep0_bounced && dep->number == 0)
 262                 dwc->ep0_bounced = false;
 263         else
 264                 usb_gadget_unmap_request(&dwc->gadget, &req->request,
 265                                 req->direction);
 266
 267         dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
 268                         req, dep->name, req->request.actual,
 269                         req->request.length, status);
 270         trace_dwc3_gadget_giveback(req);
 271
 272         spin_unlock(&dwc->lock);
 273         usb_gadget_giveback_request(&dep->endpoint, &req->request);
 274         spin_lock(&dwc->lock);
 275 }
 276
 277 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
 278 {
 279         u32             timeout = 500;
 280         u32             reg;
 281
 282         trace_dwc3_gadget_generic_cmd(cmd, param);
 283
 284         dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
 285         dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
 286
 287         do {
 288                 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
 289                 if (!(reg & DWC3_DGCMD_CMDACT)) {
 290                         dev_vdbg(dwc->dev, "Command Complete --> %d\n",
 291                                         DWC3_DGCMD_STATUS(reg));
 292                         return 0;
 293                 }
 294
 295                 /*
 296                  * We can't sleep here, because it's also called from
 297                  * interrupt context.
 298                  */
 299                 timeout--;
 300                 if (!timeout)
 301                         return -ETIMEDOUT;
 302                 udelay(1);
 303         } while (1);
 304 }
 305
 306 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
 307                 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
 308 {
 309         struct dwc3_ep          *dep = dwc->eps[ep];
 310         u32                     timeout = 500;
 311         u32                     reg;
 312
 313         trace_dwc3_gadget_ep_cmd(dep, cmd, params);
 314
 315         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
 316         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
 317         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
 318
 319         dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
 320         do {
 321                 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
 322                 if (!(reg & DWC3_DEPCMD_CMDACT)) {
 323                         dev_vdbg(dwc->dev, "Command Complete --> %d\n",
 324                                         DWC3_DEPCMD_STATUS(reg));
 325                         return 0;
 326                 }
 327
 328                 /*
 329                  * We can't sleep here, because it is also called from
 330                  * interrupt context.
 331                  */
 332                 timeout--;
 333                 if (!timeout)
 334                         return -ETIMEDOUT;
 335
 336                 udelay(1);
 337         } while (1);
 338 }
 339
 340 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
 341                 struct dwc3_trb *trb)
 342 {
 343         u32             offset = (char *) trb - (char *) dep->trb_pool;
 344
 345         return dep->trb_pool_dma + offset;
 346 }
 347
 348 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
 349 {
 350         struct dwc3             *dwc = dep->dwc;
 351
 352         if (dep->trb_pool)
 353                 return 0;
 354
 355         if (dep->number == 0 || dep->number == 1)
 356                 return 0;
 357
 358         dep->trb_pool = dma_alloc_coherent(dwc->dev,
 359                         sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 360                         &dep->trb_pool_dma, GFP_KERNEL);
 361         if (!dep->trb_pool) {
 362                 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
 363                                 dep->name);
 364                 return -ENOMEM;
 365         }
 366
 367         return 0;
 368 }
 369
 370 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
 371 {
 372         struct dwc3             *dwc = dep->dwc;
 373
 374         dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 375                         dep->trb_pool, dep->trb_pool_dma);
 376
 377         dep->trb_pool = NULL;
 378         dep->trb_pool_dma = 0;
 379 }
 380
 381 static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
 382 {
 383         struct dwc3_gadget_ep_cmd_params params;
 384         u32                     cmd;
 385
 386         memset(&params, 0x00, sizeof(params));
 387
 388         if (dep->number != 1) {
 389                 cmd = DWC3_DEPCMD_DEPSTARTCFG;
 390                 /* XferRscIdx == 0 for ep0 and 2 for the remaining */
 391                 if (dep->number > 1) {
 392                         if (dwc->start_config_issued)
 393                                 return 0;
 394                         dwc->start_config_issued = true;
 395                         cmd |= DWC3_DEPCMD_PARAM(2);
 396                 }
 397
 398                 return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, &params);
 399         }
 400
 401         return 0;
 402 }
 403
 404 static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
 405                 const struct usb_endpoint_descriptor *desc,
 406                 const struct usb_ss_ep_comp_descriptor *comp_desc,
 407                 bool ignore, bool restore)
 408 {
 409         struct dwc3_gadget_ep_cmd_params params;
 410
 411         memset(&params, 0x00, sizeof(params));
 412
 413         params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
 414                 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
 415
 416         /* Burst size is only needed in SuperSpeed mode */
 417         if (dwc->gadget.speed == USB_SPEED_SUPER) {
 418                 u32 burst = dep->endpoint.maxburst - 1;
 419
 420                 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst);
 421         }
 422
 423         if (ignore)
 424                 params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
 425
 426         if (restore) {
 427                 params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
 428                 params.param2 |= dep->saved_state;
 429         }
 430
 431         params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
 432                 | DWC3_DEPCFG_XFER_NOT_READY_EN;
 433
 434         if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
 435                 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
 436                         | DWC3_DEPCFG_STREAM_EVENT_EN;
 437                 dep->stream_capable = true;
 438         }
 439
 440         if (!usb_endpoint_xfer_control(desc))
 441                 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
 442
 443         /*
 444          * We are doing 1:1 mapping for endpoints, meaning
 445          * Physical Endpoints 2 maps to Logical Endpoint 2 and
 446          * so on. We consider the direction bit as part of the physical
 447          * endpoint number. So USB endpoint 0x81 is 0x03.
 448          */
 449         params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
 450
 451         /*
 452          * We must use the lower 16 TX FIFOs even though
 453          * HW might have more
 454          */
 455         if (dep->direction)
 456                 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
 457
 458         if (desc->bInterval) {
 459                 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
 460                 dep->interval = 1 << (desc->bInterval - 1);
 461         }
 462
 463         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 464                         DWC3_DEPCMD_SETEPCONFIG, &params);
 465 }
 466
 467 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
 468 {
 469         struct dwc3_gadget_ep_cmd_params params;
 470
 471         memset(&params, 0x00, sizeof(params));
 472
 473         params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
 474
 475         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 476                         DWC3_DEPCMD_SETTRANSFRESOURCE, &params);
 477 }
 478
 479 /**
 480  * __dwc3_gadget_ep_enable - Initializes a HW endpoint
 481  * @dep: endpoint to be initialized
 482  * @desc: USB Endpoint Descriptor
 483  *
 484  * Caller should take care of locking
 485  */
 486 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
 487                 const struct usb_endpoint_descriptor *desc,
 488                 const struct usb_ss_ep_comp_descriptor *comp_desc,
 489                 bool ignore, bool restore)
 490 {
 491         struct dwc3             *dwc = dep->dwc;
 492         u32                     reg;
 493         int                     ret;
 494
 495         dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);
 496
 497         if (!(dep->flags & DWC3_EP_ENABLED)) {
 498                 ret = dwc3_gadget_start_config(dwc, dep);
 499                 if (ret)
 500                         return ret;
 501         }
 502
 503         ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore,
 504                         restore);
 505         if (ret)
 506                 return ret;
 507
 508         if (!(dep->flags & DWC3_EP_ENABLED)) {
 509                 struct dwc3_trb *trb_st_hw;
 510                 struct dwc3_trb *trb_link;
 511
 512                 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
 513                 if (ret)
 514                         return ret;
 515
 516                 dep->endpoint.desc = desc;
 517                 dep->comp_desc = comp_desc;
 518                 dep->type = usb_endpoint_type(desc);
 519                 dep->flags |= DWC3_EP_ENABLED;
 520
 521                 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 522                 reg |= DWC3_DALEPENA_EP(dep->number);
 523                 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 524
 525                 if (!usb_endpoint_xfer_isoc(desc))
 526                         return 0;
 527
 528                 /* Link TRB for ISOC. The HWO bit is never reset */
 529                 trb_st_hw = &dep->trb_pool[0];
 530
 531                 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
 532                 memset(trb_link, 0, sizeof(*trb_link));
 533
 534                 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 535                 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 536                 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
 537                 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
 544 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 545 {
 546         struct dwc3_request             *req;
 547
 548         if (!list_empty(&dep->req_queued)) {
 549                 dwc3_stop_active_transfer(dwc, dep->number, true);
 550
 551                 /* - giveback all requests to gadget driver */
 552                 while (!list_empty(&dep->req_queued)) {
 553                         req = next_request(&dep->req_queued);
 554
 555                         dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 556                 }
 557         }
 558
 559         while (!list_empty(&dep->request_list)) {
 560                 req = next_request(&dep->request_list);
 561
 562                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 563         }
 564 }
 565
 566 /**
 567  * __dwc3_gadget_ep_disable - Disables a HW endpoint
 568  * @dep: the endpoint to disable
 569  *
 570  * This function also removes requests which are currently processed ny the
 571  * hardware and those which are not yet scheduled.
 572  * Caller should take care of locking.
 573  */
 574 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
 575 {
 576         struct dwc3             *dwc = dep->dwc;
 577         u32                     reg;
 578
 579         dwc3_remove_requests(dwc, dep);
 580
 581         /* make sure HW endpoint isn't stalled */
 582         if (dep->flags & DWC3_EP_STALL)
 583                 __dwc3_gadget_ep_set_halt(dep, 0, false);
 584
 585         reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 586         reg &= ~DWC3_DALEPENA_EP(dep->number);
 587         dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 588
 589         dep->stream_capable = false;
 590         dep->endpoint.desc = NULL;
 591         dep->comp_desc = NULL;
 592         dep->type = 0;
 593         dep->flags = 0;
 594
 595         return 0;
 596 }
 597
 598 /* -------------------------------------------------------------------------- */
 599
 600 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
 601                 const struct usb_endpoint_descriptor *desc)
 602 {
 603         return -EINVAL;
 604 }
 605
 606 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
 607 {
 608         return -EINVAL;
 609 }
 610
 611 /* -------------------------------------------------------------------------- */
 612
 613 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
 614                 const struct usb_endpoint_descriptor *desc)
 615 {
 616         struct dwc3_ep                  *dep;
 617         struct dwc3                     *dwc;
 618         unsigned long                   flags;
 619         int                             ret;
 620
 621         if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
 622                 pr_debug("dwc3: invalid parameters\n");
 623                 return -EINVAL;
 624         }
 625
 626         if (!desc->wMaxPacketSize) {
 627                 pr_debug("dwc3: missing wMaxPacketSize\n");
 628                 return -EINVAL;
 629         }
 630
 631         dep = to_dwc3_ep(ep);
 632         dwc = dep->dwc;
 633
 634         if (dep->flags & DWC3_EP_ENABLED) {
 635                 dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n",
 636                                 dep->name);
 637                 return 0;
 638         }
 639
 640         switch (usb_endpoint_type(desc)) {
 641         case USB_ENDPOINT_XFER_CONTROL:
 642                 strlcat(dep->name, "-control", sizeof(dep->name));
 643                 break;
 644         case USB_ENDPOINT_XFER_ISOC:
 645                 strlcat(dep->name, "-isoc", sizeof(dep->name));
 646                 break;
 647         case USB_ENDPOINT_XFER_BULK:
 648                 strlcat(dep->name, "-bulk", sizeof(dep->name));
 649                 break;
 650         case USB_ENDPOINT_XFER_INT:
 651                 strlcat(dep->name, "-int", sizeof(dep->name));
 652                 break;
 653         default:
 654                 dev_err(dwc->dev, "invalid endpoint transfer type\n");
 655         }
 656
 657         spin_lock_irqsave(&dwc->lock, flags);
 658         ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false, false);
 659         spin_unlock_irqrestore(&dwc->lock, flags);
 660
 661         return ret;
 662 }
 663
 664 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
 665 {
 666         struct dwc3_ep                  *dep;
 667         struct dwc3                     *dwc;
 668         unsigned long                   flags;
 669         int                             ret;
 670
 671         if (!ep) {
 672                 pr_debug("dwc3: invalid parameters\n");
 673                 return -EINVAL;
 674         }
 675
 676         dep = to_dwc3_ep(ep);
 677         dwc = dep->dwc;
 678
 679         if (!(dep->flags & DWC3_EP_ENABLED)) {
 680                 dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n",
 681                                 dep->name);
 682                 return 0;
 683         }
 684
 685         snprintf(dep->name, sizeof(dep->name), "ep%d%s",
 686                         dep->number >> 1,
 687                         (dep->number & 1) ? "in" : "out");
 688
 689         spin_lock_irqsave(&dwc->lock, flags);
 690         ret = __dwc3_gadget_ep_disable(dep);
 691         spin_unlock_irqrestore(&dwc->lock, flags);
 692
 693         return ret;
 694 }
 695
 696 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
 697         gfp_t gfp_flags)
 698 {
 699         struct dwc3_request             *req;
 700         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 701
 702         req = kzalloc(sizeof(*req), gfp_flags);
 703         if (!req)
 704                 return NULL;
 705
 706         req->epnum      = dep->number;
 707         req->dep        = dep;
 708
 709         trace_dwc3_alloc_request(req);
 710
 711         return &req->request;
 712 }
 713
 714 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
 715                 struct usb_request *request)
 716 {
 717         struct dwc3_request             *req = to_dwc3_request(request);
 718
 719         trace_dwc3_free_request(req);
 720         kfree(req);
 721 }
 722
 723 /**
 724  * dwc3_prepare_one_trb - setup one TRB from one request
 725  * @dep: endpoint for which this request is prepared
 726  * @req: dwc3_request pointer
 727  */
 728 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
 729                 struct dwc3_request *req, dma_addr_t dma,
 730                 unsigned length, unsigned last, unsigned chain, unsigned node)
 731 {
 732         struct dwc3             *dwc = dep->dwc;
 733         struct dwc3_trb         *trb;
 734
 735         dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n",
 736                         dep->name, req, (unsigned long long) dma,
 737                         length, last ? " last" : "",
 738                         chain ? " chain" : "");
 739
 740
 741         trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
 742
 743         if (!req->trb) {
 744                 dwc3_gadget_move_request_queued(req);
 745                 req->trb = trb;
 746                 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
 747                 req->start_slot = dep->free_slot & DWC3_TRB_MASK;
 748         }
 749
 750         dep->free_slot++;
 751         /* Skip the LINK-TRB on ISOC */
 752         if (((dep->free_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
 753                         usb_endpoint_xfer_isoc(dep->endpoint.desc))
 754                 dep->free_slot++;
 755
 756         trb->size = DWC3_TRB_SIZE_LENGTH(length);
 757         trb->bpl = lower_32_bits(dma);
 758         trb->bph = upper_32_bits(dma);
 759
 760         switch (usb_endpoint_type(dep->endpoint.desc)) {
 761         case USB_ENDPOINT_XFER_CONTROL:
 762                 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
 763                 break;
 764
 765         case USB_ENDPOINT_XFER_ISOC:
 766                 if (!node)
 767                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
 768                 else
 769                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
 770                 break;
 771
 772         case USB_ENDPOINT_XFER_BULK:
 773         case USB_ENDPOINT_XFER_INT:
 774                 trb->ctrl = DWC3_TRBCTL_NORMAL;
 775                 break;
 776         default:
 777                 /*
 778                  * This is only possible with faulty memory because we
 779                  * checked it already :)
 780                  */
 781                 BUG();
 782         }
 783
 784         if (!req->request.no_interrupt && !chain)
 785                 trb->ctrl |= DWC3_TRB_CTRL_IOC;
 786
 787         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 788                 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
 789                 trb->ctrl |= DWC3_TRB_CTRL_CSP;
 790         } else if (last) {
 791                 trb->ctrl |= DWC3_TRB_CTRL_LST;
 792         }
 793
 794         if (chain)
 795                 trb->ctrl |= DWC3_TRB_CTRL_CHN;
 796
 797         if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
 798                 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
 799
 800         trb->ctrl |= DWC3_TRB_CTRL_HWO;
 801
 802         trace_dwc3_prepare_trb(dep, trb);
 803 }
 804
 805 /*
 806  * dwc3_prepare_trbs - setup TRBs from requests
 807  * @dep: endpoint for which requests are being prepared
 808  * @starting: true if the endpoint is idle and no requests are queued.
 809  *
 810  * The function goes through the requests list and sets up TRBs for the
 811  * transfers. The function returns once there are no more TRBs available or
 812  * it runs out of requests.
 813  */
 814 static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting)
 815 {
 816         struct dwc3_request     *req, *n;
 817         u32                     trbs_left;
 818         u32                     max;
 819         unsigned int            last_one = 0;
 820
 821         BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
 822
 823         /* the first request must not be queued */
 824         trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
 825
 826         /* Can't wrap around on a non-isoc EP since there's no link TRB */
 827         if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 828                 max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK);
 829                 if (trbs_left > max)
 830                         trbs_left = max;
 831         }
 832
 833         /*
 834          * If busy & slot are equal than it is either full or empty. If we are
 835          * starting to process requests then we are empty. Otherwise we are
 836          * full and don't do anything
 837          */
 838         if (!trbs_left) {
 839                 if (!starting)
 840                         return;
 841                 trbs_left = DWC3_TRB_NUM;
 842                 /*
 843                  * In case we start from scratch, we queue the ISOC requests
 844                  * starting from slot 1. This is done because we use ring
 845                  * buffer and have no LST bit to stop us. Instead, we place
 846                  * IOC bit every TRB_NUM/4. We try to avoid having an interrupt
 847                  * after the first request so we start at slot 1 and have
 848                  * 7 requests proceed before we hit the first IOC.
 849                  * Other transfer types don't use the ring buffer and are
 850                  * processed from the first TRB until the last one. Since we
 851                  * don't wrap around we have to start at the beginning.
 852                  */
 853                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 854                         dep->busy_slot = 1;
 855                         dep->free_slot = 1;
 856                 } else {
 857                         dep->busy_slot = 0;
 858                         dep->free_slot = 0;
 859                 }
 860         }
 861
 862         /* The last TRB is a link TRB, not used for xfer */
 863         if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc))
 864                 return;
 865
 866         list_for_each_entry_safe(req, n, &dep->request_list, list) {
 867                 unsigned        length;
 868                 dma_addr_t      dma;
 869                 last_one = false;
 870
 871                 if (req->request.num_mapped_sgs > 0) {
 872                         struct usb_request *request = &req->request;
 873                         struct scatterlist *sg = request->sg;
 874                         struct scatterlist *s;
 875                         int             i;
 876
 877                         for_each_sg(sg, s, request->num_mapped_sgs, i) {
 878                                 unsigned chain = true;
 879
 880                                 length = sg_dma_len(s);
 881                                 dma = sg_dma_address(s);
 882
 883                                 if (i == (request->num_mapped_sgs - 1) ||
 884                                                 sg_is_last(s)) {
 885                                         if (list_is_last(&req->list,
 886                                                         &dep->request_list))
 887                                                 last_one = true;
 888                                         chain = false;
 889                                 }
 890
 891                                 trbs_left--;
 892                                 if (!trbs_left)
 893                                         last_one = true;
 894
 895                                 if (last_one)
 896                                         chain = false;
 897
 898                                 dwc3_prepare_one_trb(dep, req, dma, length,
 899                                                 last_one, chain, i);
 900
 901                                 if (last_one)
 902                                         break;
 903                         }
 904                 } else {
 905                         dma = req->request.dma;
 906                         length = req->request.length;
 907                         trbs_left--;
 908
 909                         if (!trbs_left)
 910                                 last_one = 1;
 911
 912                         /* Is this the last request? */
 913                         if (list_is_last(&req->list, &dep->request_list))
 914                                 last_one = 1;
 915
 916                         dwc3_prepare_one_trb(dep, req, dma, length,
 917                                         last_one, false, 0);
 918
 919                         if (last_one)
 920                                 break;
 921                 }
 922         }
 923 }
 924
 925 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
 926                 int start_new)
 927 {
 928         struct dwc3_gadget_ep_cmd_params params;
 929         struct dwc3_request             *req;
 930         struct dwc3                     *dwc = dep->dwc;
 931         int                             ret;
 932         u32                             cmd;
 933
 934         if (start_new && (dep->flags & DWC3_EP_BUSY)) {
 935                 dev_vdbg(dwc->dev, "%s: endpoint busy\n", dep->name);
 936                 return -EBUSY;
 937         }
 938         dep->flags &= ~DWC3_EP_PENDING_REQUEST;
 939
 940         /*
 941          * If we are getting here after a short-out-packet we don't enqueue any
 942          * new requests as we try to set the IOC bit only on the last request.
 943          */
 944         if (start_new) {
 945                 if (list_empty(&dep->req_queued))
 946                         dwc3_prepare_trbs(dep, start_new);
 947
 948                 /* req points to the first request which will be sent */
 949                 req = next_request(&dep->req_queued);
 950         } else {
 951                 dwc3_prepare_trbs(dep, start_new);
 952
 953                 /*
 954                  * req points to the first request where HWO changed from 0 to 1
 955                  */
 956                 req = next_request(&dep->req_queued);
 957         }
 958         if (!req) {
 959                 dep->flags |= DWC3_EP_PENDING_REQUEST;
 960                 return 0;
 961         }
 962
 963         memset(&params, 0, sizeof(params));
 964
 965         if (start_new) {
 966                 params.param0 = upper_32_bits(req->trb_dma);
 967                 params.param1 = lower_32_bits(req->trb_dma);
 968                 cmd = DWC3_DEPCMD_STARTTRANSFER;
 969         } else {
 970                 cmd = DWC3_DEPCMD_UPDATETRANSFER;
 971         }
 972
 973         cmd |= DWC3_DEPCMD_PARAM(cmd_param);
 974         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
 975         if (ret < 0) {
 976                 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
 977
 978                 /*
 979                  * FIXME we need to iterate over the list of requests
 980                  * here and stop, unmap, free and del each of the linked
 981                  * requests instead of what we do now.
 982                  */
 983                 usb_gadget_unmap_request(&dwc->gadget, &req->request,
 984                                 req->direction);
 985                 list_del(&req->list);
 986                 return ret;
 987         }
 988
 989         dep->flags |= DWC3_EP_BUSY;
 990
 991         if (start_new) {
 992                 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
 993                                 dep->number);
 994                 WARN_ON_ONCE(!dep->resource_index);
 995         }
 996
 997         return 0;
 998 }
 999
1000 static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
1001                 struct dwc3_ep *dep, u32 cur_uf)
1002 {
1003         u32 uf;
1004
1005         if (list_empty(&dep->request_list)) {
1006                 dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n",
1007                         dep->name);
1008                 dep->flags |= DWC3_EP_PENDING_REQUEST;
1009                 return;
1010         }
1011
1012         /* 4 micro frames in the future */
1013         uf = cur_uf + dep->interval * 4;
1014
1015         __dwc3_gadget_kick_transfer(dep, uf, 1);
1016 }
1017
1018 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1019                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1020 {
1021         u32 cur_uf, mask;
1022
1023         mask = ~(dep->interval - 1);
1024         cur_uf = event->parameters & mask;
1025
1026         __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1027 }
1028
1029 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1030 {
1031         struct dwc3             *dwc = dep->dwc;
1032         int                     ret;
1033
1034         req->request.actual     = 0;
1035         req->request.status     = -EINPROGRESS;
1036         req->direction          = dep->direction;
1037         req->epnum              = dep->number;
1038
1039         /*
1040          * We only add to our list of requests now and
1041          * start consuming the list once we get XferNotReady
1042          * IRQ.
1043          *
1044          * That way, we avoid doing anything that we don't need
1045          * to do now and defer it until the point we receive a
1046          * particular token from the Host side.
1047          *
1048          * This will also avoid Host cancelling URBs due to too
1049          * many NAKs.
1050          */
1051         ret = usb_gadget_map_request(&dwc->gadget, &req->request,
1052                         dep->direction);
1053         if (ret)
1054                 return ret;
1055
1056         list_add_tail(&req->list, &dep->request_list);
1057
1058         /*
1059          * There are a few special cases:
1060          *
1061          * 1. XferNotReady with empty list of requests. We need to kick the
1062          *    transfer here in that situation, otherwise we will be NAKing
1063          *    forever. If we get XferNotReady before gadget driver has a
1064          *    chance to queue a request, we will ACK the IRQ but won't be
1065          *    able to receive the data until the next request is queued.
1066          *    The following code is handling exactly that.
1067          *
1068          */
1069         if (dep->flags & DWC3_EP_PENDING_REQUEST) {
1070                 /*
1071                  * If xfernotready is already elapsed and it is a case
1072                  * of isoc transfer, then issue END TRANSFER, so that
1073                  * you can receive xfernotready again and can have
1074                  * notion of current microframe.
1075                  */
1076                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1077                         if (list_empty(&dep->req_queued)) {
1078                                 dwc3_stop_active_transfer(dwc, dep->number, true);
1079                                 dep->flags = DWC3_EP_ENABLED;
1080                         }
1081                         return 0;
1082                 }
1083
1084                 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1085                 if (ret && ret != -EBUSY)
1086                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1087                                         dep->name);
1088                 return ret;
1089         }
1090
1091         /*
1092          * 2. XferInProgress on Isoc EP with an active transfer. We need to
1093          *    kick the transfer here after queuing a request, otherwise the
1094          *    core may not see the modified TRB(s).
1095          */
1096         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1097                         (dep->flags & DWC3_EP_BUSY) &&
1098                         !(dep->flags & DWC3_EP_MISSED_ISOC)) {
1099                 WARN_ON_ONCE(!dep->resource_index);
1100                 ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index,
1101                                 false);
1102                 if (ret && ret != -EBUSY)
1103                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1104                                         dep->name);
1105                 return ret;
1106         }
1107
1108         /*
1109          * 4. Stream Capable Bulk Endpoints. We need to start the transfer
1110          * right away, otherwise host will not know we have streams to be
1111          * handled.
1112          */
1113         if (dep->stream_capable) {
1114                 int     ret;
1115
1116                 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1117                 if (ret && ret != -EBUSY) {
1118                         struct dwc3     *dwc = dep->dwc;
1119
1120                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1121                                         dep->name);
1122                 }
1123         }
1124
1125         return 0;
1126 }
1127
1128 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1129         gfp_t gfp_flags)
1130 {
1131         struct dwc3_request             *req = to_dwc3_request(request);
1132         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1133         struct dwc3                     *dwc = dep->dwc;
1134
1135         unsigned long                   flags;
1136
1137         int                             ret;
1138
1139         spin_lock_irqsave(&dwc->lock, flags);
1140         if (!dep->endpoint.desc) {
1141                 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
1142                                 request, ep->name);
1143                 ret = -ESHUTDOWN;
1144                 goto out;
1145         }
1146
1147         if (WARN(req->dep != dep, "request %p belongs to '%s'\n",
1148                                 request, req->dep->name)) {
1149                 ret = -EINVAL;
1150                 goto out;
1151         }
1152
1153         dev_vdbg(dwc->dev, "queing request %p to %s length %d\n",
1154                         request, ep->name, request->length);
1155         trace_dwc3_ep_queue(req);
1156
1157         ret = __dwc3_gadget_ep_queue(dep, req);
1158
1159 out:
1160         spin_unlock_irqrestore(&dwc->lock, flags);
1161
1162         return ret;
1163 }
1164
1165 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1166                 struct usb_request *request)
1167 {
1168         struct dwc3_request             *req = to_dwc3_request(request);
1169         struct dwc3_request             *r = NULL;
1170
1171         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1172         struct dwc3                     *dwc = dep->dwc;
1173
1174         unsigned long                   flags;
1175         int                             ret = 0;
1176
1177         trace_dwc3_ep_dequeue(req);
1178
1179         spin_lock_irqsave(&dwc->lock, flags);
1180
1181         list_for_each_entry(r, &dep->request_list, list) {
1182                 if (r == req)
1183                         break;
1184         }
1185
1186         if (r != req) {
1187                 list_for_each_entry(r, &dep->req_queued, list) {
1188                         if (r == req)
1189                                 break;
1190                 }
1191                 if (r == req) {
1192                         /* wait until it is processed */
1193                         dwc3_stop_active_transfer(dwc, dep->number, true);
1194                         goto out1;
1195                 }
1196                 dev_err(dwc->dev, "request %p was not queued to %s\n",
1197                                 request, ep->name);
1198                 ret = -EINVAL;
1199                 goto out0;
1200         }
1201
1202 out1:
1203         /* giveback the request */
1204         dwc3_gadget_giveback(dep, req, -ECONNRESET);
1205
1206 out0:
1207         spin_unlock_irqrestore(&dwc->lock, flags);
1208
1209         return ret;
1210 }
1211
1212 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
1213 {
1214         struct dwc3_gadget_ep_cmd_params        params;
1215         struct dwc3                             *dwc = dep->dwc;
1216         int                                     ret;
1217
1218         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1219                 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1220                 return -EINVAL;
1221         }
1222
1223         memset(&params, 0x00, sizeof(params));
1224
1225         if (value) {
1226                 if (!protocol && ((dep->direction && dep->flags & DWC3_EP_BUSY) ||
1227                                 (!list_empty(&dep->req_queued) ||
1228                                  !list_empty(&dep->request_list)))) {
1229                         dev_dbg(dwc->dev, "%s: pending request, cannot halt\n",
1230                                         dep->name);
1231                         return -EAGAIN;
1232                 }
1233
1234                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1235                         DWC3_DEPCMD_SETSTALL, &params);
1236                 if (ret)
1237                         dev_err(dwc->dev, "failed to set STALL on %s\n",
1238                                         dep->name);
1239                 else
1240                         dep->flags |= DWC3_EP_STALL;
1241         } else {
1242                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1243                         DWC3_DEPCMD_CLEARSTALL, &params);
1244                 if (ret)
1245                         dev_err(dwc->dev, "failed to clear STALL on %s\n",
1246                                         dep->name);
1247                 else
1248                         dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1249         }
1250
1251         return ret;
1252 }
1253
1254 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1255 {
1256         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1257         struct dwc3                     *dwc = dep->dwc;
1258
1259         unsigned long                   flags;
1260
1261         int                             ret;
1262
1263         spin_lock_irqsave(&dwc->lock, flags);
1264         ret = __dwc3_gadget_ep_set_halt(dep, value, false);
1265         spin_unlock_irqrestore(&dwc->lock, flags);
1266
1267         return ret;
1268 }
1269
1270 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1271 {
1272         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1273         struct dwc3                     *dwc = dep->dwc;
1274         unsigned long                   flags;
1275         int                             ret;
1276
1277         spin_lock_irqsave(&dwc->lock, flags);
1278         dep->flags |= DWC3_EP_WEDGE;
1279
1280         if (dep->number == 0 || dep->number == 1)
1281                 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
1282         else
1283                 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
1284         spin_unlock_irqrestore(&dwc->lock, flags);
1285
1286         return ret;
1287 }
1288
1289 /* -------------------------------------------------------------------------- */
1290
1291 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1292         .bLength        = USB_DT_ENDPOINT_SIZE,
1293         .bDescriptorType = USB_DT_ENDPOINT,
1294         .bmAttributes   = USB_ENDPOINT_XFER_CONTROL,
1295 };
1296
1297 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1298         .enable         = dwc3_gadget_ep0_enable,
1299         .disable        = dwc3_gadget_ep0_disable,
1300         .alloc_request  = dwc3_gadget_ep_alloc_request,
1301         .free_request   = dwc3_gadget_ep_free_request,
1302         .queue          = dwc3_gadget_ep0_queue,
1303         .dequeue        = dwc3_gadget_ep_dequeue,
1304         .set_halt       = dwc3_gadget_ep0_set_halt,
1305         .set_wedge      = dwc3_gadget_ep_set_wedge,
1306 };
1307
1308 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1309         .enable         = dwc3_gadget_ep_enable,
1310         .disable        = dwc3_gadget_ep_disable,
1311         .alloc_request  = dwc3_gadget_ep_alloc_request,
1312         .free_request   = dwc3_gadget_ep_free_request,
1313         .queue          = dwc3_gadget_ep_queue,
1314         .dequeue        = dwc3_gadget_ep_dequeue,
1315         .set_halt       = dwc3_gadget_ep_set_halt,
1316         .set_wedge      = dwc3_gadget_ep_set_wedge,
1317 };
1318
1319 /* -------------------------------------------------------------------------- */
1320
1321 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1322 {
1323         struct dwc3             *dwc = gadget_to_dwc(g);
1324         u32                     reg;
1325
1326         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1327         return DWC3_DSTS_SOFFN(reg);
1328 }
1329
1330 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1331 {
1332         struct dwc3             *dwc = gadget_to_dwc(g);
1333
1334         unsigned long           timeout;
1335         unsigned long           flags;
1336
1337         u32                     reg;
1338
1339         int                     ret = 0;
1340
1341         u8                      link_state;
1342         u8                      speed;
1343
1344         spin_lock_irqsave(&dwc->lock, flags);
1345
1346         /*
1347          * According to the Databook Remote wakeup request should
1348          * be issued only when the device is in early suspend state.
1349          *
1350          * We can check that via USB Link State bits in DSTS register.
1351          */
1352         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1353
1354         speed = reg & DWC3_DSTS_CONNECTSPD;
1355         if (speed == DWC3_DSTS_SUPERSPEED) {
1356                 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n");
1357                 ret = -EINVAL;
1358                 goto out;
1359         }
1360
1361         link_state = DWC3_DSTS_USBLNKST(reg);
1362
1363         switch (link_state) {
1364         case DWC3_LINK_STATE_RX_DET:    /* in HS, means Early Suspend */
1365         case DWC3_LINK_STATE_U3:        /* in HS, means SUSPEND */
1366                 break;
1367         default:
1368                 dev_dbg(dwc->dev, "can't wakeup from link state %d\n",
1369                                 link_state);
1370                 ret = -EINVAL;
1371                 goto out;
1372         }
1373
1374         ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1375         if (ret < 0) {
1376                 dev_err(dwc->dev, "failed to put link in Recovery\n");
1377                 goto out;
1378         }
1379
1380         /* Recent versions do this automatically */
1381         if (dwc->revision < DWC3_REVISION_194A) {
1382                 /* write zeroes to Link Change Request */
1383                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1384                 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1385                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1386         }
1387
1388         /* poll until Link State changes to ON */
1389         timeout = jiffies + msecs_to_jiffies(100);
1390
1391         while (!time_after(jiffies, timeout)) {
1392                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1393
1394                 /* in HS, means ON */
1395                 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1396                         break;
1397         }
1398
1399         if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1400                 dev_err(dwc->dev, "failed to send remote wakeup\n");
1401                 ret = -EINVAL;
1402         }
1403
1404 out:
1405         spin_unlock_irqrestore(&dwc->lock, flags);
1406
1407         return ret;
1408 }
1409
1410 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1411                 int is_selfpowered)
1412 {
1413         struct dwc3             *dwc = gadget_to_dwc(g);
1414         unsigned long           flags;
1415
1416         spin_lock_irqsave(&dwc->lock, flags);
1417         dwc->is_selfpowered = !!is_selfpowered;
1418         spin_unlock_irqrestore(&dwc->lock, flags);
1419
1420         return 0;
1421 }
1422
1423 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
1424 {
1425         u32                     reg;
1426         u32                     timeout = 500;
1427
1428         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1429         if (is_on) {
1430                 if (dwc->revision <= DWC3_REVISION_187A) {
1431                         reg &= ~DWC3_DCTL_TRGTULST_MASK;
1432                         reg |= DWC3_DCTL_TRGTULST_RX_DET;
1433                 }
1434
1435                 if (dwc->revision >= DWC3_REVISION_194A)
1436                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1437                 reg |= DWC3_DCTL_RUN_STOP;
1438
1439                 if (dwc->has_hibernation)
1440                         reg |= DWC3_DCTL_KEEP_CONNECT;
1441
1442                 dwc->pullups_connected = true;
1443         } else {
1444                 reg &= ~DWC3_DCTL_RUN_STOP;
1445
1446                 if (dwc->has_hibernation && !suspend)
1447                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1448
1449                 dwc->pullups_connected = false;
1450         }
1451
1452         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1453
1454         do {
1455                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1456                 if (is_on) {
1457                         if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1458                                 break;
1459                 } else {
1460                         if (reg & DWC3_DSTS_DEVCTRLHLT)
1461                                 break;
1462                 }
1463                 timeout--;
1464                 if (!timeout)
1465                         return -ETIMEDOUT;
1466                 udelay(1);
1467         } while (1);
1468
1469         dev_vdbg(dwc->dev, "gadget %s data soft-%s\n",
1470                         dwc->gadget_driver
1471                         ? dwc->gadget_driver->function : "no-function",
1472                         is_on ? "connect" : "disconnect");
1473
1474         return 0;
1475 }
1476
1477 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1478 {
1479         struct dwc3             *dwc = gadget_to_dwc(g);
1480         unsigned long           flags;
1481         int                     ret;
1482
1483         is_on = !!is_on;
1484
1485         spin_lock_irqsave(&dwc->lock, flags);
1486         ret = dwc3_gadget_run_stop(dwc, is_on, false);
1487         spin_unlock_irqrestore(&dwc->lock, flags);
1488
1489         return ret;
1490 }
1491
1492 static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1493 {
1494         u32                     reg;
1495
1496         /* Enable all but Start and End of Frame IRQs */
1497         reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1498                         DWC3_DEVTEN_EVNTOVERFLOWEN |
1499                         DWC3_DEVTEN_CMDCMPLTEN |
1500                         DWC3_DEVTEN_ERRTICERREN |
1501                         DWC3_DEVTEN_WKUPEVTEN |
1502                         DWC3_DEVTEN_ULSTCNGEN |
1503                         DWC3_DEVTEN_CONNECTDONEEN |
1504                         DWC3_DEVTEN_USBRSTEN |
1505                         DWC3_DEVTEN_DISCONNEVTEN);
1506
1507         dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1508 }
1509
1510 static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1511 {
1512         /* mask all interrupts */
1513         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1514 }
1515
1516 static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1517 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1518
1519 static int dwc3_gadget_start(struct usb_gadget *g,
1520                 struct usb_gadget_driver *driver)
1521 {
1522         struct dwc3             *dwc = gadget_to_dwc(g);
1523         struct dwc3_ep          *dep;
1524         unsigned long           flags;
1525         int                     ret = 0;
1526         int                     irq;
1527         u32                     reg;
1528
1529         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1530         ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
1531                         IRQF_SHARED, "dwc3", dwc);
1532         if (ret) {
1533                 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
1534                                 irq, ret);
1535                 goto err0;
1536         }
1537
1538         spin_lock_irqsave(&dwc->lock, flags);
1539
1540         if (dwc->gadget_driver) {
1541                 dev_err(dwc->dev, "%s is already bound to %s\n",
1542                                 dwc->gadget.name,
1543                                 dwc->gadget_driver->driver.name);
1544                 ret = -EBUSY;
1545                 goto err1;
1546         }
1547
1548         dwc->gadget_driver      = driver;
1549
1550         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1551         reg &= ~(DWC3_DCFG_SPEED_MASK);
1552
1553         /**
1554          * WORKAROUND: DWC3 revision < 2.20a have an issue
1555          * which would cause metastability state on Run/Stop
1556          * bit if we try to force the IP to USB2-only mode.
1557          *
1558          * Because of that, we cannot configure the IP to any
1559          * speed other than the SuperSpeed
1560          *
1561          * Refers to:
1562          *
1563          * STAR#9000525659: Clock Domain Crossing on DCTL in
1564          * USB 2.0 Mode
1565          */
1566         if (dwc->revision < DWC3_REVISION_220A) {
1567                 reg |= DWC3_DCFG_SUPERSPEED;
1568         } else {
1569                 switch (dwc->maximum_speed) {
1570                 case USB_SPEED_LOW:
1571                         reg |= DWC3_DSTS_LOWSPEED;
1572                         break;
1573                 case USB_SPEED_FULL:
1574                         reg |= DWC3_DSTS_FULLSPEED1;
1575                         break;
1576                 case USB_SPEED_HIGH:
1577                         reg |= DWC3_DSTS_HIGHSPEED;
1578                         break;
1579                 case USB_SPEED_SUPER:   /* FALLTHROUGH */
1580                 case USB_SPEED_UNKNOWN: /* FALTHROUGH */
1581                 default:
1582                         reg |= DWC3_DSTS_SUPERSPEED;
1583                 }
1584         }
1585         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1586
1587         dwc->start_config_issued = false;
1588
1589         /* Start with SuperSpeed Default */
1590         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1591
1592         dep = dwc->eps[0];
1593         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1594                         false);
1595         if (ret) {
1596                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1597                 goto err2;
1598         }
1599
1600         dep = dwc->eps[1];
1601         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1602                         false);
1603         if (ret) {
1604                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1605                 goto err3;
1606         }
1607
1608         /* begin to receive SETUP packets */
1609         dwc->ep0state = EP0_SETUP_PHASE;
1610         dwc3_ep0_out_start(dwc);
1611
1612         dwc3_gadget_enable_irq(dwc);
1613
1614         spin_unlock_irqrestore(&dwc->lock, flags);
1615
1616         return 0;
1617
1618 err3:
1619         __dwc3_gadget_ep_disable(dwc->eps[0]);
1620
1621 err2:
1622         dwc->gadget_driver = NULL;
1623
1624 err1:
1625         spin_unlock_irqrestore(&dwc->lock, flags);
1626
1627         free_irq(irq, dwc);
1628
1629 err0:
1630         return ret;
1631 }
1632
1633 static int dwc3_gadget_stop(struct usb_gadget *g)
1634 {
1635         struct dwc3             *dwc = gadget_to_dwc(g);
1636         unsigned long           flags;
1637         int                     irq;
1638
1639         spin_lock_irqsave(&dwc->lock, flags);
1640
1641         dwc3_gadget_disable_irq(dwc);
1642         __dwc3_gadget_ep_disable(dwc->eps[0]);
1643         __dwc3_gadget_ep_disable(dwc->eps[1]);
1644
1645         dwc->gadget_driver      = NULL;
1646
1647         spin_unlock_irqrestore(&dwc->lock, flags);
1648
1649         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1650         free_irq(irq, dwc);
1651
1652         return 0;
1653 }
1654
1655 static const struct usb_gadget_ops dwc3_gadget_ops = {
1656         .get_frame              = dwc3_gadget_get_frame,
1657         .wakeup                 = dwc3_gadget_wakeup,
1658         .set_selfpowered        = dwc3_gadget_set_selfpowered,
1659         .pullup                 = dwc3_gadget_pullup,
1660         .udc_start              = dwc3_gadget_start,
1661         .udc_stop               = dwc3_gadget_stop,
1662 };
1663
1664 /* -------------------------------------------------------------------------- */
1665
1666 static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1667                 u8 num, u32 direction)
1668 {
1669         struct dwc3_ep                  *dep;
1670         u8                              i;
1671
1672         for (i = 0; i < num; i++) {
1673                 u8 epnum = (i << 1) | (!!direction);
1674
1675                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1676                 if (!dep)
1677                         return -ENOMEM;
1678
1679                 dep->dwc = dwc;
1680                 dep->number = epnum;
1681                 dep->direction = !!direction;
1682                 dwc->eps[epnum] = dep;
1683
1684                 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1685                                 (epnum & 1) ? "in" : "out");
1686
1687                 dep->endpoint.name = dep->name;
1688
1689                 dev_vdbg(dwc->dev, "initializing %s\n", dep->name);
1690
1691                 if (epnum == 0 || epnum == 1) {
1692                         usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
1693                         dep->endpoint.maxburst = 1;
1694                         dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1695                         if (!epnum)
1696                                 dwc->gadget.ep0 = &dep->endpoint;
1697                 } else {
1698                         int             ret;
1699
1700                         usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
1701                         dep->endpoint.max_streams = 15;
1702                         dep->endpoint.ops = &dwc3_gadget_ep_ops;
1703                         list_add_tail(&dep->endpoint.ep_list,
1704                                         &dwc->gadget.ep_list);
1705
1706                         ret = dwc3_alloc_trb_pool(dep);
1707                         if (ret)
1708                                 return ret;
1709                 }
1710
1711                 INIT_LIST_HEAD(&dep->request_list);
1712                 INIT_LIST_HEAD(&dep->req_queued);
1713         }
1714
1715         return 0;
1716 }
1717
1718 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1719 {
1720         int                             ret;
1721
1722         INIT_LIST_HEAD(&dwc->gadget.ep_list);
1723
1724         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1725         if (ret < 0) {
1726                 dev_vdbg(dwc->dev, "failed to allocate OUT endpoints\n");
1727                 return ret;
1728         }
1729
1730         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1731         if (ret < 0) {
1732                 dev_vdbg(dwc->dev, "failed to allocate IN endpoints\n");
1733                 return ret;
1734         }
1735
1736         return 0;
1737 }
1738
1739 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1740 {
1741         struct dwc3_ep                  *dep;
1742         u8                              epnum;
1743
1744         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1745                 dep = dwc->eps[epnum];
1746                 if (!dep)
1747                         continue;
1748                 /*
1749                  * Physical endpoints 0 and 1 are special; they form the
1750                  * bi-directional USB endpoint 0.
1751                  *
1752                  * For those two physical endpoints, we don't allocate a TRB
1753                  * pool nor do we add them the endpoints list. Due to that, we
1754                  * shouldn't do these two operations otherwise we would end up
1755                  * with all sorts of bugs when removing dwc3.ko.
1756                  */
1757                 if (epnum != 0 && epnum != 1) {
1758                         dwc3_free_trb_pool(dep);
1759                         list_del(&dep->endpoint.ep_list);
1760                 }
1761
1762                 kfree(dep);
1763         }
1764 }
1765
1766 /* -------------------------------------------------------------------------- */
1767
1768 static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
1769                 struct dwc3_request *req, struct dwc3_trb *trb,
1770                 const struct dwc3_event_depevt *event, int status)
1771 {
1772         unsigned int            count;
1773         unsigned int            s_pkt = 0;
1774         unsigned int            trb_status;
1775
1776         trace_dwc3_complete_trb(dep, trb);
1777
1778         if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
1779                 /*
1780                  * We continue despite the error. There is not much we
1781                  * can do. If we don't clean it up we loop forever. If
1782                  * we skip the TRB then it gets overwritten after a
1783                  * while since we use them in a ring buffer. A BUG()
1784                  * would help. Lets hope that if this occurs, someone
1785                  * fixes the root cause instead of looking away :)
1786                  */
1787                 dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1788                                 dep->name, trb);
1789         count = trb->size & DWC3_TRB_SIZE_MASK;
1790
1791         if (dep->direction) {
1792                 if (count) {
1793                         trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
1794                         if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
1795                                 dev_dbg(dwc->dev, "incomplete IN transfer %s\n",
1796                                                 dep->name);
1797                                 /*
1798                                  * If missed isoc occurred and there is
1799                                  * no request queued then issue END
1800                                  * TRANSFER, so that core generates
1801                                  * next xfernotready and we will issue
1802                                  * a fresh START TRANSFER.
1803                                  * If there are still queued request
1804                                  * then wait, do not issue either END
1805                                  * or UPDATE TRANSFER, just attach next
1806                                  * request in request_list during
1807                                  * giveback.If any future queued request
1808                                  * is successfully transferred then we
1809                                  * will issue UPDATE TRANSFER for all
1810                                  * request in the request_list.
1811                                  */
1812                                 dep->flags |= DWC3_EP_MISSED_ISOC;
1813                         } else {
1814                                 dev_err(dwc->dev, "incomplete IN transfer %s\n",
1815                                                 dep->name);
1816                                 status = -ECONNRESET;
1817                         }
1818                 } else {
1819                         dep->flags &= ~DWC3_EP_MISSED_ISOC;
1820                 }
1821         } else {
1822                 if (count && (event->status & DEPEVT_STATUS_SHORT))
1823                         s_pkt = 1;
1824         }
1825
1826         /*
1827          * We assume here we will always receive the entire data block
1828          * which we should receive. Meaning, if we program RX to
1829          * receive 4K but we receive only 2K, we assume that's all we
1830          * should receive and we simply bounce the request back to the
1831          * gadget driver for further processing.
1832          */
1833         req->request.actual += req->request.length - count;
1834         if (s_pkt)
1835                 return 1;
1836         if ((event->status & DEPEVT_STATUS_LST) &&
1837                         (trb->ctrl & (DWC3_TRB_CTRL_LST |
1838                                 DWC3_TRB_CTRL_HWO)))
1839                 return 1;
1840         if ((event->status & DEPEVT_STATUS_IOC) &&
1841                         (trb->ctrl & DWC3_TRB_CTRL_IOC))
1842                 return 1;
1843         return 0;
1844 }
1845
1846 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1847                 const struct dwc3_event_depevt *event, int status)
1848 {
1849         struct dwc3_request     *req;
1850         struct dwc3_trb         *trb;
1851         unsigned int            slot;
1852         unsigned int            i;
1853         int                     ret;
1854
1855         do {
1856                 req = next_request(&dep->req_queued);
1857                 if (!req) {
1858                         WARN_ON_ONCE(1);
1859                         return 1;
1860                 }
1861                 i = 0;
1862                 do {
1863                         slot = req->start_slot + i;
1864                         if ((slot == DWC3_TRB_NUM - 1) &&
1865                                 usb_endpoint_xfer_isoc(dep->endpoint.desc))
1866                                 slot++;
1867                         slot %= DWC3_TRB_NUM;
1868                         trb = &dep->trb_pool[slot];
1869
1870                         ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
1871                                         event, status);
1872                         if (ret)
1873                                 break;
1874                 }while (++i < req->request.num_mapped_sgs);
1875
1876                 dwc3_gadget_giveback(dep, req, status);
1877
1878                 if (ret)
1879                         break;
1880         } while (1);
1881
1882         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1883                         list_empty(&dep->req_queued)) {
1884                 if (list_empty(&dep->request_list)) {
1885                         /*
1886                          * If there is no entry in request list then do
1887                          * not issue END TRANSFER now. Just set PENDING
1888                          * flag, so that END TRANSFER is issued when an
1889                          * entry is added into request list.
1890                          */
1891                         dep->flags = DWC3_EP_PENDING_REQUEST;
1892                 } else {
1893                         dwc3_stop_active_transfer(dwc, dep->number, true);
1894                         dep->flags = DWC3_EP_ENABLED;
1895                 }
1896                 return 1;
1897         }
1898
1899         return 1;
1900 }
1901
1902 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
1903                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1904 {
1905         unsigned                status = 0;
1906         int                     clean_busy;
1907
1908         if (event->status & DEPEVT_STATUS_BUSERR)
1909                 status = -ECONNRESET;
1910
1911         clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
1912         if (clean_busy)
1913                 dep->flags &= ~DWC3_EP_BUSY;
1914
1915         /*
1916          * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
1917          * See dwc3_gadget_linksts_change_interrupt() for 1st half.
1918          */
1919         if (dwc->revision < DWC3_REVISION_183A) {
1920                 u32             reg;
1921                 int             i;
1922
1923                 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
1924                         dep = dwc->eps[i];
1925
1926                         if (!(dep->flags & DWC3_EP_ENABLED))
1927                                 continue;
1928
1929                         if (!list_empty(&dep->req_queued))
1930                                 return;
1931                 }
1932
1933                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1934                 reg |= dwc->u1u2;
1935                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1936
1937                 dwc->u1u2 = 0;
1938         }
1939 }
1940
1941 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
1942                 const struct dwc3_event_depevt *event)
1943 {
1944         struct dwc3_ep          *dep;
1945         u8                      epnum = event->endpoint_number;
1946
1947         dep = dwc->eps[epnum];
1948
1949         if (!(dep->flags & DWC3_EP_ENABLED))
1950                 return;
1951
1952         if (epnum == 0 || epnum == 1) {
1953                 dwc3_ep0_interrupt(dwc, event);
1954                 return;
1955         }
1956
1957         switch (event->endpoint_event) {
1958         case DWC3_DEPEVT_XFERCOMPLETE:
1959                 dep->resource_index = 0;
1960
1961                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1962                         dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n",
1963                                         dep->name);
1964                         return;
1965                 }
1966
1967                 dwc3_endpoint_transfer_complete(dwc, dep, event);
1968                 break;
1969         case DWC3_DEPEVT_XFERINPROGRESS:
1970                 dwc3_endpoint_transfer_complete(dwc, dep, event);
1971                 break;
1972         case DWC3_DEPEVT_XFERNOTREADY:
1973                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1974                         dwc3_gadget_start_isoc(dwc, dep, event);
1975                 } else {
1976                         int ret;
1977
1978                         dev_vdbg(dwc->dev, "%s: reason %s\n",
1979                                         dep->name, event->status &
1980                                         DEPEVT_STATUS_TRANSFER_ACTIVE
1981                                         ? "Transfer Active"
1982                                         : "Transfer Not Active");
1983
1984                         ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
1985                         if (!ret || ret == -EBUSY)
1986                                 return;
1987
1988                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1989                                         dep->name);
1990                 }
1991
1992                 break;
1993         case DWC3_DEPEVT_STREAMEVT:
1994                 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
1995                         dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
1996                                         dep->name);
1997                         return;
1998                 }
1999
2000                 switch (event->status) {
2001                 case DEPEVT_STREAMEVT_FOUND:
2002                         dev_vdbg(dwc->dev, "Stream %d found and started\n",
2003                                         event->parameters);
2004
2005                         break;
2006                 case DEPEVT_STREAMEVT_NOTFOUND:
2007                         /* FALLTHROUGH */
2008                 default:
2009                         dev_dbg(dwc->dev, "Couldn't find suitable stream\n");
2010                 }
2011                 break;
2012         case DWC3_DEPEVT_RXTXFIFOEVT:
2013                 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name);
2014                 break;
2015         case DWC3_DEPEVT_EPCMDCMPLT:
2016                 dev_vdbg(dwc->dev, "Endpoint Command Complete\n");
2017                 break;
2018         }
2019 }
2020
2021 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
2022 {
2023         if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
2024                 spin_unlock(&dwc->lock);
2025                 dwc->gadget_driver->disconnect(&dwc->gadget);
2026                 spin_lock(&dwc->lock);
2027         }
2028 }
2029
2030 static void dwc3_suspend_gadget(struct dwc3 *dwc)
2031 {
2032         if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
2033                 spin_unlock(&dwc->lock);
2034                 dwc->gadget_driver->suspend(&dwc->gadget);
2035                 spin_lock(&dwc->lock);
2036         }
2037 }
2038
2039 static void dwc3_resume_gadget(struct dwc3 *dwc)
2040 {
2041         if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2042                 spin_unlock(&dwc->lock);
2043                 dwc->gadget_driver->resume(&dwc->gadget);
2044         }
2045 }
2046
2047 static void dwc3_reset_gadget(struct dwc3 *dwc)
2048 {
2049         if (!dwc->gadget_driver)
2050                 return;
2051
2052         if (dwc->gadget.speed != USB_SPEED_UNKNOWN) {
2053                 spin_unlock(&dwc->lock);
2054                 usb_gadget_udc_reset(&dwc->gadget, dwc->gadget_driver);
2055                 spin_lock(&dwc->lock);
2056         }
2057 }
2058
2059 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force)
2060 {
2061         struct dwc3_ep *dep;
2062         struct dwc3_gadget_ep_cmd_params params;
2063         u32 cmd;
2064         int ret;
2065
2066         dep = dwc->eps[epnum];
2067
2068         if (!dep->resource_index)
2069                 return;
2070
2071         /*
2072          * NOTICE: We are violating what the Databook says about the
2073          * EndTransfer command. Ideally we would _always_ wait for the
2074          * EndTransfer Command Completion IRQ, but that's causing too
2075          * much trouble synchronizing between us and gadget driver.
2076          *
2077          * We have discussed this with the IP Provider and it was
2078          * suggested to giveback all requests here, but give HW some
2079          * extra time to synchronize with the interconnect. We're using
2080          * an arbitraty 100us delay for that.
2081          *
2082          * Note also that a similar handling was tested by Synopsys
2083          * (thanks a lot Paul) and nothing bad has come out of it.
2084          * In short, what we're doing is:
2085          *
2086          * - Issue EndTransfer WITH CMDIOC bit set
2087          * - Wait 100us
2088          */
2089
2090         cmd = DWC3_DEPCMD_ENDTRANSFER;
2091         cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
2092         cmd |= DWC3_DEPCMD_CMDIOC;
2093         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
2094         memset(&params, 0, sizeof(params));
2095         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
2096         WARN_ON_ONCE(ret);
2097         dep->resource_index = 0;
2098         dep->flags &= ~DWC3_EP_BUSY;
2099         udelay(100);
2100 }
2101
2102 static void dwc3_stop_active_transfers(struct dwc3 *dwc)
2103 {
2104         u32 epnum;
2105
2106         for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2107                 struct dwc3_ep *dep;
2108
2109                 dep = dwc->eps[epnum];
2110                 if (!dep)
2111                         continue;
2112
2113                 if (!(dep->flags & DWC3_EP_ENABLED))
2114                         continue;
2115
2116                 dwc3_remove_requests(dwc, dep);
2117         }
2118 }
2119
2120 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2121 {
2122         u32 epnum;
2123
2124         for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2125                 struct dwc3_ep *dep;
2126                 struct dwc3_gadget_ep_cmd_params params;
2127                 int ret;
2128
2129                 dep = dwc->eps[epnum];
2130                 if (!dep)
2131                         continue;
2132
2133                 if (!(dep->flags & DWC3_EP_STALL))
2134                         continue;
2135
2136                 dep->flags &= ~DWC3_EP_STALL;
2137
2138                 memset(&params, 0, sizeof(params));
2139                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
2140                                 DWC3_DEPCMD_CLEARSTALL, &params);
2141                 WARN_ON_ONCE(ret);
2142         }
2143 }
2144
2145 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2146 {
2147         int                     reg;
2148
2149         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2150         reg &= ~DWC3_DCTL_INITU1ENA;
2151         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2152
2153         reg &= ~DWC3_DCTL_INITU2ENA;
2154         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2155
2156         dwc3_disconnect_gadget(dwc);
2157         dwc->start_config_issued = false;
2158
2159         dwc->gadget.speed = USB_SPEED_UNKNOWN;
2160         dwc->setup_packet_pending = false;
2161         usb_gadget_set_state(&dwc->gadget, USB_STATE_NOTATTACHED);
2162 }
2163
2164 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2165 {
2166         u32                     reg;
2167
2168         /*
2169          * WORKAROUND: DWC3 revisions <1.88a have an issue which
2170          * would cause a missing Disconnect Event if there's a
2171          * pending Setup Packet in the FIFO.
2172          *
2173          * There's no suggested workaround on the official Bug
2174          * report, which states that "unless the driver/application
2175          * is doing any special handling of a disconnect event,
2176          * there is no functional issue".
2177          *
2178          * Unfortunately, it turns out that we _do_ some special
2179          * handling of a disconnect event, namely complete all
2180          * pending transfers, notify gadget driver of the
2181          * disconnection, and so on.
2182          *
2183          * Our suggested workaround is to follow the Disconnect
2184          * Event steps here, instead, based on a setup_packet_pending
2185          * flag. Such flag gets set whenever we have a XferNotReady
2186          * event on EP0 and gets cleared on XferComplete for the
2187          * same endpoint.
2188          *
2189          * Refers to:
2190          *
2191          * STAR#9000466709: RTL: Device : Disconnect event not
2192          * generated if setup packet pending in FIFO
2193          */
2194         if (dwc->revision < DWC3_REVISION_188A) {
2195                 if (dwc->setup_packet_pending)
2196                         dwc3_gadget_disconnect_interrupt(dwc);
2197         }
2198
2199         dwc3_reset_gadget(dwc);
2200
2201         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2202         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2203         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2204         dwc->test_mode = false;
2205
2206         dwc3_stop_active_transfers(dwc);
2207         dwc3_clear_stall_all_ep(dwc);
2208         dwc->start_config_issued = false;
2209
2210         /* Reset device address to zero */
2211         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2212         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2213         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2214 }
2215
2216 static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
2217 {
2218         u32 reg;
2219         u32 usb30_clock = DWC3_GCTL_CLK_BUS;
2220
2221         /*
2222          * We change the clock only at SS but I dunno why I would want to do
2223          * this. Maybe it becomes part of the power saving plan.
2224          */
2225
2226         if (speed != DWC3_DSTS_SUPERSPEED)
2227                 return;
2228
2229         /*
2230          * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2231          * each time on Connect Done.
2232          */
2233         if (!usb30_clock)
2234                 return;
2235
2236         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
2237         reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
2238         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
2239 }
2240
2241 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2242 {
2243         struct dwc3_ep          *dep;
2244         int                     ret;
2245         u32                     reg;
2246         u8                      speed;
2247
2248         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2249         speed = reg & DWC3_DSTS_CONNECTSPD;
2250         dwc->speed = speed;
2251
2252         dwc3_update_ram_clk_sel(dwc, speed);
2253
2254         switch (speed) {
2255         case DWC3_DCFG_SUPERSPEED:
2256                 /*
2257                  * WORKAROUND: DWC3 revisions <1.90a have an issue which
2258                  * would cause a missing USB3 Reset event.
2259                  *
2260                  * In such situations, we should force a USB3 Reset
2261                  * event by calling our dwc3_gadget_reset_interrupt()
2262                  * routine.
2263                  *
2264                  * Refers to:
2265                  *
2266                  * STAR#9000483510: RTL: SS : USB3 reset event may
2267                  * not be generated always when the link enters poll
2268                  */
2269                 if (dwc->revision < DWC3_REVISION_190A)
2270                         dwc3_gadget_reset_interrupt(dwc);
2271
2272                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2273                 dwc->gadget.ep0->maxpacket = 512;
2274                 dwc->gadget.speed = USB_SPEED_SUPER;
2275                 break;
2276         case DWC3_DCFG_HIGHSPEED:
2277                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2278                 dwc->gadget.ep0->maxpacket = 64;
2279                 dwc->gadget.speed = USB_SPEED_HIGH;
2280                 break;
2281         case DWC3_DCFG_FULLSPEED2:
2282         case DWC3_DCFG_FULLSPEED1:
2283                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2284                 dwc->gadget.ep0->maxpacket = 64;
2285                 dwc->gadget.speed = USB_SPEED_FULL;
2286                 break;
2287         case DWC3_DCFG_LOWSPEED:
2288                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2289                 dwc->gadget.ep0->maxpacket = 8;
2290                 dwc->gadget.speed = USB_SPEED_LOW;
2291                 break;
2292         }
2293
2294         /* Enable USB2 LPM Capability */
2295
2296         if ((dwc->revision > DWC3_REVISION_194A)
2297                         && (speed != DWC3_DCFG_SUPERSPEED)) {
2298                 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2299                 reg |= DWC3_DCFG_LPM_CAP;
2300                 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2301
2302                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2303                 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2304
2305                 reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold);
2306
2307                 /*
2308                  * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
2309                  * DCFG.LPMCap is set, core responses with an ACK and the
2310                  * BESL value in the LPM token is less than or equal to LPM
2311                  * NYET threshold.
2312                  */
2313                 WARN_ONCE(dwc->revision < DWC3_REVISION_240A
2314                                 && dwc->has_lpm_erratum,
2315                                 "LPM Erratum not available on dwc3 revisisions < 2.40a\n");
2316
2317                 if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A)
2318                         reg |= DWC3_DCTL_LPM_ERRATA(dwc->lpm_nyet_threshold);
2319
2320                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2321         } else {
2322                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2323                 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
2324                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2325         }
2326
2327         dep = dwc->eps[0];
2328         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2329                         false);
2330         if (ret) {
2331                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2332                 return;
2333         }
2334
2335         dep = dwc->eps[1];
2336         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2337                         false);
2338         if (ret) {
2339                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2340                 return;
2341         }
2342
2343         /*
2344          * Configure PHY via GUSB3PIPECTLn if required.
2345          *
2346          * Update GTXFIFOSIZn
2347          *
2348          * In both cases reset values should be sufficient.
2349          */
2350 }
2351
2352 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2353 {
2354         /*
2355          * TODO take core out of low power mode when that's
2356          * implemented.
2357          */
2358
2359         dwc->gadget_driver->resume(&dwc->gadget);
2360 }
2361
2362 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2363                 unsigned int evtinfo)
2364 {
2365         enum dwc3_link_state    next = evtinfo & DWC3_LINK_STATE_MASK;
2366         unsigned int            pwropt;
2367
2368         /*
2369          * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2370          * Hibernation mode enabled which would show up when device detects
2371          * host-initiated U3 exit.
2372          *
2373          * In that case, device will generate a Link State Change Interrupt
2374          * from U3 to RESUME which is only necessary if Hibernation is
2375          * configured in.
2376          *
2377          * There are no functional changes due to such spurious event and we
2378          * just need to ignore it.
2379          *
2380          * Refers to:
2381          *
2382          * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2383          * operational mode
2384          */
2385         pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
2386         if ((dwc->revision < DWC3_REVISION_250A) &&
2387                         (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
2388                 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
2389                                 (next == DWC3_LINK_STATE_RESUME)) {
2390                         dev_vdbg(dwc->dev, "ignoring transition U3 -> Resume\n");
2391                         return;
2392                 }
2393         }
2394
2395         /*
2396          * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2397          * on the link partner, the USB session might do multiple entry/exit
2398          * of low power states before a transfer takes place.
2399          *
2400          * Due to this problem, we might experience lower throughput. The
2401          * suggested workaround is to disable DCTL[12:9] bits if we're
2402          * transitioning from U1/U2 to U0 and enable those bits again
2403          * after a transfer completes and there are no pending transfers
2404          * on any of the enabled endpoints.
2405          *
2406          * This is the first half of that workaround.
2407          *
2408          * Refers to:
2409          *
2410          * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2411          * core send LGO_Ux entering U0
2412          */
2413         if (dwc->revision < DWC3_REVISION_183A) {
2414                 if (next == DWC3_LINK_STATE_U0) {
2415                         u32     u1u2;
2416                         u32     reg;
2417
2418                         switch (dwc->link_state) {
2419                         case DWC3_LINK_STATE_U1:
2420                         case DWC3_LINK_STATE_U2:
2421                                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2422                                 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2423                                                 | DWC3_DCTL_ACCEPTU2ENA
2424                                                 | DWC3_DCTL_INITU1ENA
2425                                                 | DWC3_DCTL_ACCEPTU1ENA);
2426
2427                                 if (!dwc->u1u2)
2428                                         dwc->u1u2 = reg & u1u2;
2429
2430                                 reg &= ~u1u2;
2431
2432                                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2433                                 break;
2434                         default:
2435                                 /* do nothing */
2436                                 break;
2437                         }
2438                 }
2439         }
2440
2441         switch (next) {
2442         case DWC3_LINK_STATE_U1:
2443                 if (dwc->speed == USB_SPEED_SUPER)
2444                         dwc3_suspend_gadget(dwc);
2445                 break;
2446         case DWC3_LINK_STATE_U2:
2447         case DWC3_LINK_STATE_U3:
2448                 dwc3_suspend_gadget(dwc);
2449                 break;
2450         case DWC3_LINK_STATE_RESUME:
2451                 dwc3_resume_gadget(dwc);
2452                 break;
2453         default:
2454                 /* do nothing */
2455                 break;
2456         }
2457
2458         dwc->link_state = next;
2459 }
2460
2461 static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
2462                 unsigned int evtinfo)
2463 {
2464         unsigned int is_ss = evtinfo & BIT(4);
2465
2466         /**
2467          * WORKAROUND: DWC3 revison 2.20a with hibernation support
2468          * have a known issue which can cause USB CV TD.9.23 to fail
2469          * randomly.
2470          *
2471          * Because of this issue, core could generate bogus hibernation
2472          * events which SW needs to ignore.
2473          *
2474          * Refers to:
2475          *
2476          * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
2477          * Device Fallback from SuperSpeed
2478          */
2479         if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
2480                 return;
2481
2482         /* enter hibernation here */
2483 }
2484
2485 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2486                 const struct dwc3_event_devt *event)
2487 {
2488         switch (event->type) {
2489         case DWC3_DEVICE_EVENT_DISCONNECT:
2490                 dwc3_gadget_disconnect_interrupt(dwc);
2491                 break;
2492         case DWC3_DEVICE_EVENT_RESET:
2493                 dwc3_gadget_reset_interrupt(dwc);
2494                 break;
2495         case DWC3_DEVICE_EVENT_CONNECT_DONE:
2496                 dwc3_gadget_conndone_interrupt(dwc);
2497                 break;
2498         case DWC3_DEVICE_EVENT_WAKEUP:
2499                 dwc3_gadget_wakeup_interrupt(dwc);
2500                 break;
2501         case DWC3_DEVICE_EVENT_HIBER_REQ:
2502                 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
2503                                         "unexpected hibernation event\n"))
2504                         break;
2505
2506                 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
2507                 break;
2508         case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2509                 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2510                 break;
2511         case DWC3_DEVICE_EVENT_EOPF:
2512                 dev_vdbg(dwc->dev, "End of Periodic Frame\n");
2513                 break;
2514         case DWC3_DEVICE_EVENT_SOF:
2515                 dev_vdbg(dwc->dev, "Start of Periodic Frame\n");
2516                 break;
2517         case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2518                 dev_vdbg(dwc->dev, "Erratic Error\n");
2519                 break;
2520         case DWC3_DEVICE_EVENT_CMD_CMPL:
2521                 dev_vdbg(dwc->dev, "Command Complete\n");
2522                 break;
2523         case DWC3_DEVICE_EVENT_OVERFLOW:
2524                 dev_vdbg(dwc->dev, "Overflow\n");
2525                 break;
2526         default:
2527                 dev_dbg(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2528         }
2529 }
2530
2531 static void dwc3_process_event_entry(struct dwc3 *dwc,
2532                 const union dwc3_event *event)
2533 {
2534         trace_dwc3_event(event->raw);
2535
2536         /* Endpoint IRQ, handle it and return early */
2537         if (event->type.is_devspec == 0) {
2538                 /* depevt */
2539                 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2540         }
2541
2542         switch (event->type.type) {
2543         case DWC3_EVENT_TYPE_DEV:
2544                 dwc3_gadget_interrupt(dwc, &event->devt);
2545                 break;
2546         /* REVISIT what to do with Carkit and I2C events ? */
2547         default:
2548                 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2549         }
2550 }
2551
2552 static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
2553 {
2554         struct dwc3_event_buffer *evt;
2555         irqreturn_t ret = IRQ_NONE;
2556         int left;
2557         u32 reg;
2558
2559         evt = dwc->ev_buffs[buf];
2560         left = evt->count;
2561
2562         if (!(evt->flags & DWC3_EVENT_PENDING))
2563                 return IRQ_NONE;
2564
2565         while (left > 0) {
2566                 union dwc3_event event;
2567
2568                 event.raw = *(u32 *) (evt->buf + evt->lpos);
2569
2570                 dwc3_process_event_entry(dwc, &event);
2571
2572                 /*
2573                  * FIXME we wrap around correctly to the next entry as
2574                  * almost all entries are 4 bytes in size. There is one
2575                  * entry which has 12 bytes which is a regular entry
2576                  * followed by 8 bytes data. ATM I don't know how
2577                  * things are organized if we get next to the a
2578                  * boundary so I worry about that once we try to handle
2579                  * that.
2580                  */
2581                 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
2582                 left -= 4;
2583
2584                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4);
2585         }
2586
2587         evt->count = 0;
2588         evt->flags &= ~DWC3_EVENT_PENDING;
2589         ret = IRQ_HANDLED;
2590
2591         /* Unmask interrupt */
2592         reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2593         reg &= ~DWC3_GEVNTSIZ_INTMASK;
2594         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2595
2596         return ret;
2597 }
2598
2599 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
2600 {
2601         struct dwc3 *dwc = _dwc;
2602         unsigned long flags;
2603         irqreturn_t ret = IRQ_NONE;
2604         int i;
2605
2606         spin_lock_irqsave(&dwc->lock, flags);
2607
2608         for (i = 0; i < dwc->num_event_buffers; i++)
2609                 ret |= dwc3_process_event_buf(dwc, i);
2610
2611         spin_unlock_irqrestore(&dwc->lock, flags);
2612
2613         return ret;
2614 }
2615
2616 static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc, u32 buf)
2617 {
2618         struct dwc3_event_buffer *evt;
2619         u32 count;
2620         u32 reg;
2621
2622         evt = dwc->ev_buffs[buf];
2623
2624         count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
2625         count &= DWC3_GEVNTCOUNT_MASK;
2626         if (!count)
2627                 return IRQ_NONE;
2628
2629         evt->count = count;
2630         evt->flags |= DWC3_EVENT_PENDING;
2631
2632         /* Mask interrupt */
2633         reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2634         reg |= DWC3_GEVNTSIZ_INTMASK;
2635         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2636
2637         return IRQ_WAKE_THREAD;
2638 }
2639
2640 static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
2641 {
2642         struct dwc3                     *dwc = _dwc;
2643         int                             i;
2644         irqreturn_t                     ret = IRQ_NONE;
2645
2646         spin_lock(&dwc->lock);
2647
2648         for (i = 0; i < dwc->num_event_buffers; i++) {
2649                 irqreturn_t status;
2650
2651                 status = dwc3_check_event_buf(dwc, i);
2652                 if (status == IRQ_WAKE_THREAD)
2653                         ret = status;
2654         }
2655
2656         spin_unlock(&dwc->lock);
2657
2658         return ret;
2659 }
2660
2661 /**
2662  * dwc3_gadget_init - Initializes gadget related registers
2663  * @dwc: pointer to our controller context structure
2664  *
2665  * Returns 0 on success otherwise negative errno.
2666  */
2667 int dwc3_gadget_init(struct dwc3 *dwc)
2668 {
2669         int                                     ret;
2670
2671         dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2672                         &dwc->ctrl_req_addr, GFP_KERNEL);
2673         if (!dwc->ctrl_req) {
2674                 dev_err(dwc->dev, "failed to allocate ctrl request\n");
2675                 ret = -ENOMEM;
2676                 goto err0;
2677         }
2678
2679         dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2680                         &dwc->ep0_trb_addr, GFP_KERNEL);
2681         if (!dwc->ep0_trb) {
2682                 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
2683                 ret = -ENOMEM;
2684                 goto err1;
2685         }
2686
2687         dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
2688         if (!dwc->setup_buf) {
2689                 ret = -ENOMEM;
2690                 goto err2;
2691         }
2692
2693         dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
2694                         DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
2695                         GFP_KERNEL);
2696         if (!dwc->ep0_bounce) {
2697                 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
2698                 ret = -ENOMEM;
2699                 goto err3;
2700         }
2701
2702         dwc->gadget.ops                 = &dwc3_gadget_ops;
2703         dwc->gadget.max_speed           = USB_SPEED_SUPER;
2704         dwc->gadget.speed               = USB_SPEED_UNKNOWN;
2705         dwc->gadget.sg_supported        = true;
2706         dwc->gadget.name                = "dwc3-gadget";
2707
2708         /*
2709          * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
2710          * on ep out.
2711          */
2712         dwc->gadget.quirk_ep_out_aligned_size = true;
2713
2714         /*
2715          * REVISIT: Here we should clear all pending IRQs to be
2716          * sure we're starting from a well known location.
2717          */
2718
2719         ret = dwc3_gadget_init_endpoints(dwc);
2720         if (ret)
2721                 goto err4;
2722
2723         ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
2724         if (ret) {
2725                 dev_err(dwc->dev, "failed to register udc\n");
2726                 goto err4;
2727         }
2728
2729         return 0;
2730
2731 err4:
2732         dwc3_gadget_free_endpoints(dwc);
2733         dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2734                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
2735
2736 err3:
2737         kfree(dwc->setup_buf);
2738
2739 err2:
2740         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2741                         dwc->ep0_trb, dwc->ep0_trb_addr);
2742
2743 err1:
2744         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2745                         dwc->ctrl_req, dwc->ctrl_req_addr);
2746
2747 err0:
2748         return ret;
2749 }
2750
2751 /* -------------------------------------------------------------------------- */
2752
2753 void dwc3_gadget_exit(struct dwc3 *dwc)
2754 {
2755         usb_del_gadget_udc(&dwc->gadget);
2756
2757         dwc3_gadget_free_endpoints(dwc);
2758
2759         dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2760                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
2761
2762         kfree(dwc->setup_buf);
2763
2764         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2765                         dwc->ep0_trb, dwc->ep0_trb_addr);
2766
2767         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2768                         dwc->ctrl_req, dwc->ctrl_req_addr);
2769 }
2770
2771 int dwc3_gadget_suspend(struct dwc3 *dwc)
2772 {
2773         if (dwc->pullups_connected) {
2774                 dwc3_gadget_disable_irq(dwc);
2775                 dwc3_gadget_run_stop(dwc, true, true);
2776         }
2777
2778         __dwc3_gadget_ep_disable(dwc->eps[0]);
2779         __dwc3_gadget_ep_disable(dwc->eps[1]);
2780
2781         dwc->dcfg = dwc3_readl(dwc->regs, DWC3_DCFG);
2782
2783         return 0;
2784 }
2785
2786 int dwc3_gadget_resume(struct dwc3 *dwc)
2787 {
2788         struct dwc3_ep          *dep;
2789         int                     ret;
2790
2791         /* Start with SuperSpeed Default */
2792         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2793
2794         dep = dwc->eps[0];
2795         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
2796                         false);
2797         if (ret)
2798                 goto err0;
2799
2800         dep = dwc->eps[1];
2801         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
2802                         false);
2803         if (ret)
2804                 goto err1;
2805
2806         /* begin to receive SETUP packets */
2807         dwc->ep0state = EP0_SETUP_PHASE;
2808         dwc3_ep0_out_start(dwc);
2809
2810         dwc3_writel(dwc->regs, DWC3_DCFG, dwc->dcfg);
2811
2812         if (dwc->pullups_connected) {
2813                 dwc3_gadget_enable_irq(dwc);
2814                 dwc3_gadget_run_stop(dwc, true, false);
2815         }
2816
2817         return 0;
2818
2819 err1:
2820         __dwc3_gadget_ep_disable(dwc->eps[0]);
2821
2822 err0:
2823         return ret;
2824 }