kernel/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         dwc3_trace(trace_dwc3_gadget,
 143                         "link state change request timed out");
 144
 145         return -ETIMEDOUT;
 146 }
 147
 148 /**
 149  * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
 150  * @dwc: pointer to our context structure
 151  *
 152  * This function will a best effort FIFO allocation in order
 153  * to improve FIFO usage and throughput, while still allowing
 154  * us to enable as many endpoints as possible.
 155  *
 156  * Keep in mind that this operation will be highly dependent
 157  * on the configured size for RAM1 - which contains TxFifo -,
 158  * the amount of endpoints enabled on coreConsultant tool, and
 159  * the width of the Master Bus.
 160  *
 161  * In the ideal world, we would always be able to satisfy the
 162  * following equation:
 163  *
 164  * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
 165  * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
 166  *
 167  * Unfortunately, due to many variables that's not always the case.
 168  */
 169 int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
 170 {
 171         int             last_fifo_depth = 0;
 172         int             ram1_depth;
 173         int             fifo_size;
 174         int             mdwidth;
 175         int             num;
 176
 177         if (!dwc->needs_fifo_resize)
 178                 return 0;
 179
 180         ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
 181         mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
 182
 183         /* MDWIDTH is represented in bits, we need it in bytes */
 184         mdwidth >>= 3;
 185
 186         /*
 187          * FIXME For now we will only allocate 1 wMaxPacketSize space
 188          * for each enabled endpoint, later patches will come to
 189          * improve this algorithm so that we better use the internal
 190          * FIFO space
 191          */
 192         for (num = 0; num < dwc->num_in_eps; num++) {
 193                 /* bit0 indicates direction; 1 means IN ep */
 194                 struct dwc3_ep  *dep = dwc->eps[(num << 1) | 1];
 195                 int             mult = 1;
 196                 int             tmp;
 197
 198                 if (!(dep->flags & DWC3_EP_ENABLED))
 199                         continue;
 200
 201                 if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
 202                                 || usb_endpoint_xfer_isoc(dep->endpoint.desc))
 203                         mult = 3;
 204
 205                 /*
 206                  * REVISIT: the following assumes we will always have enough
 207                  * space available on the FIFO RAM for all possible use cases.
 208                  * Make sure that's true somehow and change FIFO allocation
 209                  * accordingly.
 210                  *
 211                  * If we have Bulk or Isochronous endpoints, we want
 212                  * them to be able to be very, very fast. So we're giving
 213                  * those endpoints a fifo_size which is enough for 3 full
 214                  * packets
 215                  */
 216                 tmp = mult * (dep->endpoint.maxpacket + mdwidth);
 217                 tmp += mdwidth;
 218
 219                 fifo_size = DIV_ROUND_UP(tmp, mdwidth);
 220
 221                 fifo_size |= (last_fifo_depth << 16);
 222
 223                 dwc3_trace(trace_dwc3_gadget, "%s: Fifo Addr %04x Size %d",
 224                                 dep->name, last_fifo_depth, fifo_size & 0xffff);
 225
 226                 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num), fifo_size);
 227
 228                 last_fifo_depth += (fifo_size & 0xffff);
 229         }
 230
 231         return 0;
 232 }
 233
 234 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 235                 int status)
 236 {
 237         struct dwc3                     *dwc = dep->dwc;
 238         int                             i;
 239
 240         if (req->queued) {
 241                 i = 0;
 242                 do {
 243                         dep->busy_slot++;
 244                         /*
 245                          * Skip LINK TRB. We can't use req->trb and check for
 246                          * DWC3_TRBCTL_LINK_TRB because it points the TRB we
 247                          * just completed (not the LINK TRB).
 248                          */
 249                         if (((dep->busy_slot & DWC3_TRB_MASK) ==
 250                                 DWC3_TRB_NUM- 1) &&
 251                                 usb_endpoint_xfer_isoc(dep->endpoint.desc))
 252                                 dep->busy_slot++;
 253                 } while(++i < req->request.num_mapped_sgs);
 254                 req->queued = false;
 255         }
 256         list_del(&req->list);
 257         req->trb = NULL;
 258
 259         if (req->request.status == -EINPROGRESS)
 260                 req->request.status = status;
 261
 262         if (dwc->ep0_bounced && dep->number == 0)
 263                 dwc->ep0_bounced = false;
 264         else
 265                 usb_gadget_unmap_request(&dwc->gadget, &req->request,
 266                                 req->direction);
 267
 268         dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
 269                         req, dep->name, req->request.actual,
 270                         req->request.length, status);
 271         trace_dwc3_gadget_giveback(req);
 272
 273         spin_unlock(&dwc->lock);
 274         usb_gadget_giveback_request(&dep->endpoint, &req->request);
 275         spin_lock(&dwc->lock);
 276 }
 277
 278 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
 279 {
 280         u32             timeout = 500;
 281         u32             reg;
 282
 283         trace_dwc3_gadget_generic_cmd(cmd, param);
 284
 285         dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
 286         dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
 287
 288         do {
 289                 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
 290                 if (!(reg & DWC3_DGCMD_CMDACT)) {
 291                         dwc3_trace(trace_dwc3_gadget,
 292                                         "Command Complete --> %d",
 293                                         DWC3_DGCMD_STATUS(reg));
 294                         return 0;
 295                 }
 296
 297                 /*
 298                  * We can't sleep here, because it's also called from
 299                  * interrupt context.
 300                  */
 301                 timeout--;
 302                 if (!timeout) {
 303                         dwc3_trace(trace_dwc3_gadget,
 304                                         "Command Timed Out");
 305                         return -ETIMEDOUT;
 306                 }
 307                 udelay(1);
 308         } while (1);
 309 }
 310
 311 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
 312                 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
 313 {
 314         struct dwc3_ep          *dep = dwc->eps[ep];
 315         u32                     timeout = 500;
 316         u32                     reg;
 317
 318         trace_dwc3_gadget_ep_cmd(dep, cmd, params);
 319
 320         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
 321         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
 322         dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
 323
 324         dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
 325         do {
 326                 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
 327                 if (!(reg & DWC3_DEPCMD_CMDACT)) {
 328                         dwc3_trace(trace_dwc3_gadget,
 329                                         "Command Complete --> %d",
 330                                         DWC3_DEPCMD_STATUS(reg));
 331                         return 0;
 332                 }
 333
 334                 /*
 335                  * We can't sleep here, because it is also called from
 336                  * interrupt context.
 337                  */
 338                 timeout--;
 339                 if (!timeout) {
 340                         dwc3_trace(trace_dwc3_gadget,
 341                                         "Command Timed Out");
 342                         return -ETIMEDOUT;
 343                 }
 344
 345                 udelay(1);
 346         } while (1);
 347 }
 348
 349 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
 350                 struct dwc3_trb *trb)
 351 {
 352         u32             offset = (char *) trb - (char *) dep->trb_pool;
 353
 354         return dep->trb_pool_dma + offset;
 355 }
 356
 357 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
 358 {
 359         struct dwc3             *dwc = dep->dwc;
 360
 361         if (dep->trb_pool)
 362                 return 0;
 363
 364         dep->trb_pool = dma_alloc_coherent(dwc->dev,
 365                         sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 366                         &dep->trb_pool_dma, GFP_KERNEL);
 367         if (!dep->trb_pool) {
 368                 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
 369                                 dep->name);
 370                 return -ENOMEM;
 371         }
 372
 373         return 0;
 374 }
 375
 376 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
 377 {
 378         struct dwc3             *dwc = dep->dwc;
 379
 380         dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 381                         dep->trb_pool, dep->trb_pool_dma);
 382
 383         dep->trb_pool = NULL;
 384         dep->trb_pool_dma = 0;
 385 }
 386
 387 static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
 388 {
 389         struct dwc3_gadget_ep_cmd_params params;
 390         u32                     cmd;
 391
 392         memset(&params, 0x00, sizeof(params));
 393
 394         if (dep->number != 1) {
 395                 cmd = DWC3_DEPCMD_DEPSTARTCFG;
 396                 /* XferRscIdx == 0 for ep0 and 2 for the remaining */
 397                 if (dep->number > 1) {
 398                         if (dwc->start_config_issued)
 399                                 return 0;
 400                         dwc->start_config_issued = true;
 401                         cmd |= DWC3_DEPCMD_PARAM(2);
 402                 }
 403
 404                 return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, &params);
 405         }
 406
 407         return 0;
 408 }
 409
 410 static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
 411                 const struct usb_endpoint_descriptor *desc,
 412                 const struct usb_ss_ep_comp_descriptor *comp_desc,
 413                 bool ignore, bool restore)
 414 {
 415         struct dwc3_gadget_ep_cmd_params params;
 416
 417         memset(&params, 0x00, sizeof(params));
 418
 419         params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
 420                 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
 421
 422         /* Burst size is only needed in SuperSpeed mode */
 423         if (dwc->gadget.speed == USB_SPEED_SUPER) {
 424                 u32 burst = dep->endpoint.maxburst - 1;
 425
 426                 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst);
 427         }
 428
 429         if (ignore)
 430                 params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
 431
 432         if (restore) {
 433                 params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
 434                 params.param2 |= dep->saved_state;
 435         }
 436
 437         params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
 438                 | DWC3_DEPCFG_XFER_NOT_READY_EN;
 439
 440         if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
 441                 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
 442                         | DWC3_DEPCFG_STREAM_EVENT_EN;
 443                 dep->stream_capable = true;
 444         }
 445
 446         if (!usb_endpoint_xfer_control(desc))
 447                 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
 448
 449         /*
 450          * We are doing 1:1 mapping for endpoints, meaning
 451          * Physical Endpoints 2 maps to Logical Endpoint 2 and
 452          * so on. We consider the direction bit as part of the physical
 453          * endpoint number. So USB endpoint 0x81 is 0x03.
 454          */
 455         params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
 456
 457         /*
 458          * We must use the lower 16 TX FIFOs even though
 459          * HW might have more
 460          */
 461         if (dep->direction)
 462                 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
 463
 464         if (desc->bInterval) {
 465                 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
 466                 dep->interval = 1 << (desc->bInterval - 1);
 467         }
 468
 469         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 470                         DWC3_DEPCMD_SETEPCONFIG, &params);
 471 }
 472
 473 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
 474 {
 475         struct dwc3_gadget_ep_cmd_params params;
 476
 477         memset(&params, 0x00, sizeof(params));
 478
 479         params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
 480
 481         return dwc3_send_gadget_ep_cmd(dwc, dep->number,
 482                         DWC3_DEPCMD_SETTRANSFRESOURCE, &params);
 483 }
 484
 485 /**
 486  * __dwc3_gadget_ep_enable - Initializes a HW endpoint
 487  * @dep: endpoint to be initialized
 488  * @desc: USB Endpoint Descriptor
 489  *
 490  * Caller should take care of locking
 491  */
 492 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
 493                 const struct usb_endpoint_descriptor *desc,
 494                 const struct usb_ss_ep_comp_descriptor *comp_desc,
 495                 bool ignore, bool restore)
 496 {
 497         struct dwc3             *dwc = dep->dwc;
 498         u32                     reg;
 499         int                     ret;
 500
 501         dwc3_trace(trace_dwc3_gadget, "Enabling %s", dep->name);
 502
 503         if (!(dep->flags & DWC3_EP_ENABLED)) {
 504                 ret = dwc3_gadget_start_config(dwc, dep);
 505                 if (ret)
 506                         return ret;
 507         }
 508
 509         ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore,
 510                         restore);
 511         if (ret)
 512                 return ret;
 513
 514         if (!(dep->flags & DWC3_EP_ENABLED)) {
 515                 struct dwc3_trb *trb_st_hw;
 516                 struct dwc3_trb *trb_link;
 517
 518                 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
 519                 if (ret)
 520                         return ret;
 521
 522                 dep->endpoint.desc = desc;
 523                 dep->comp_desc = comp_desc;
 524                 dep->type = usb_endpoint_type(desc);
 525                 dep->flags |= DWC3_EP_ENABLED;
 526
 527                 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 528                 reg |= DWC3_DALEPENA_EP(dep->number);
 529                 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 530
 531                 if (!usb_endpoint_xfer_isoc(desc))
 532                         return 0;
 533
 534                 /* Link TRB for ISOC. The HWO bit is never reset */
 535                 trb_st_hw = &dep->trb_pool[0];
 536
 537                 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
 538                 memset(trb_link, 0, sizeof(*trb_link));
 539
 540                 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 541                 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 542                 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
 543                 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
 544         }
 545
 546         return 0;
 547 }
 548
 549 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
 550 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 551 {
 552         struct dwc3_request             *req;
 553
 554         if (!list_empty(&dep->req_queued)) {
 555                 dwc3_stop_active_transfer(dwc, dep->number, true);
 556
 557                 /* - giveback all requests to gadget driver */
 558                 while (!list_empty(&dep->req_queued)) {
 559                         req = next_request(&dep->req_queued);
 560
 561                         dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 562                 }
 563         }
 564
 565         while (!list_empty(&dep->request_list)) {
 566                 req = next_request(&dep->request_list);
 567
 568                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 569         }
 570 }
 571
 572 /**
 573  * __dwc3_gadget_ep_disable - Disables a HW endpoint
 574  * @dep: the endpoint to disable
 575  *
 576  * This function also removes requests which are currently processed ny the
 577  * hardware and those which are not yet scheduled.
 578  * Caller should take care of locking.
 579  */
 580 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
 581 {
 582         struct dwc3             *dwc = dep->dwc;
 583         u32                     reg;
 584
 585         dwc3_remove_requests(dwc, dep);
 586
 587         /* make sure HW endpoint isn't stalled */
 588         if (dep->flags & DWC3_EP_STALL)
 589                 __dwc3_gadget_ep_set_halt(dep, 0, false);
 590
 591         reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 592         reg &= ~DWC3_DALEPENA_EP(dep->number);
 593         dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 594
 595         dep->stream_capable = false;
 596         dep->endpoint.desc = NULL;
 597         dep->comp_desc = NULL;
 598         dep->type = 0;
 599         dep->flags = 0;
 600
 601         return 0;
 602 }
 603
 604 /* -------------------------------------------------------------------------- */
 605
 606 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
 607                 const struct usb_endpoint_descriptor *desc)
 608 {
 609         return -EINVAL;
 610 }
 611
 612 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
 613 {
 614         return -EINVAL;
 615 }
 616
 617 /* -------------------------------------------------------------------------- */
 618
 619 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
 620                 const struct usb_endpoint_descriptor *desc)
 621 {
 622         struct dwc3_ep                  *dep;
 623         struct dwc3                     *dwc;
 624         unsigned long                   flags;
 625         int                             ret;
 626
 627         if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
 628                 pr_debug("dwc3: invalid parameters\n");
 629                 return -EINVAL;
 630         }
 631
 632         if (!desc->wMaxPacketSize) {
 633                 pr_debug("dwc3: missing wMaxPacketSize\n");
 634                 return -EINVAL;
 635         }
 636
 637         dep = to_dwc3_ep(ep);
 638         dwc = dep->dwc;
 639
 640         if (dep->flags & DWC3_EP_ENABLED) {
 641                 dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n",
 642                                 dep->name);
 643                 return 0;
 644         }
 645
 646         switch (usb_endpoint_type(desc)) {
 647         case USB_ENDPOINT_XFER_CONTROL:
 648                 strlcat(dep->name, "-control", sizeof(dep->name));
 649                 break;
 650         case USB_ENDPOINT_XFER_ISOC:
 651                 strlcat(dep->name, "-isoc", sizeof(dep->name));
 652                 break;
 653         case USB_ENDPOINT_XFER_BULK:
 654                 strlcat(dep->name, "-bulk", sizeof(dep->name));
 655                 break;
 656         case USB_ENDPOINT_XFER_INT:
 657                 strlcat(dep->name, "-int", sizeof(dep->name));
 658                 break;
 659         default:
 660                 dev_err(dwc->dev, "invalid endpoint transfer type\n");
 661         }
 662
 663         spin_lock_irqsave(&dwc->lock, flags);
 664         ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false, false);
 665         spin_unlock_irqrestore(&dwc->lock, flags);
 666
 667         return ret;
 668 }
 669
 670 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
 671 {
 672         struct dwc3_ep                  *dep;
 673         struct dwc3                     *dwc;
 674         unsigned long                   flags;
 675         int                             ret;
 676
 677         if (!ep) {
 678                 pr_debug("dwc3: invalid parameters\n");
 679                 return -EINVAL;
 680         }
 681
 682         dep = to_dwc3_ep(ep);
 683         dwc = dep->dwc;
 684
 685         if (!(dep->flags & DWC3_EP_ENABLED)) {
 686                 dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n",
 687                                 dep->name);
 688                 return 0;
 689         }
 690
 691         snprintf(dep->name, sizeof(dep->name), "ep%d%s",
 692                         dep->number >> 1,
 693                         (dep->number & 1) ? "in" : "out");
 694
 695         spin_lock_irqsave(&dwc->lock, flags);
 696         ret = __dwc3_gadget_ep_disable(dep);
 697         spin_unlock_irqrestore(&dwc->lock, flags);
 698
 699         return ret;
 700 }
 701
 702 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
 703         gfp_t gfp_flags)
 704 {
 705         struct dwc3_request             *req;
 706         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 707
 708         req = kzalloc(sizeof(*req), gfp_flags);
 709         if (!req)
 710                 return NULL;
 711
 712         req->epnum      = dep->number;
 713         req->dep        = dep;
 714
 715         trace_dwc3_alloc_request(req);
 716
 717         return &req->request;
 718 }
 719
 720 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
 721                 struct usb_request *request)
 722 {
 723         struct dwc3_request             *req = to_dwc3_request(request);
 724
 725         trace_dwc3_free_request(req);
 726         kfree(req);
 727 }
 728
 729 /**
 730  * dwc3_prepare_one_trb - setup one TRB from one request
 731  * @dep: endpoint for which this request is prepared
 732  * @req: dwc3_request pointer
 733  */
 734 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
 735                 struct dwc3_request *req, dma_addr_t dma,
 736                 unsigned length, unsigned last, unsigned chain, unsigned node)
 737 {
 738         struct dwc3_trb         *trb;
 739
 740         dwc3_trace(trace_dwc3_gadget, "%s: req %p dma %08llx length %d%s%s",
 741                         dep->name, req, (unsigned long long) dma,
 742                         length, last ? " last" : "",
 743                         chain ? " chain" : "");
 744
 745
 746         trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
 747
 748         if (!req->trb) {
 749                 dwc3_gadget_move_request_queued(req);
 750                 req->trb = trb;
 751                 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
 752                 req->start_slot = dep->free_slot & DWC3_TRB_MASK;
 753         }
 754
 755         dep->free_slot++;
 756         /* Skip the LINK-TRB on ISOC */
 757         if (((dep->free_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
 758                         usb_endpoint_xfer_isoc(dep->endpoint.desc))
 759                 dep->free_slot++;
 760
 761         trb->size = DWC3_TRB_SIZE_LENGTH(length);
 762         trb->bpl = lower_32_bits(dma);
 763         trb->bph = upper_32_bits(dma);
 764
 765         switch (usb_endpoint_type(dep->endpoint.desc)) {
 766         case USB_ENDPOINT_XFER_CONTROL:
 767                 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
 768                 break;
 769
 770         case USB_ENDPOINT_XFER_ISOC:
 771                 if (!node)
 772                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
 773                 else
 774                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
 775                 break;
 776
 777         case USB_ENDPOINT_XFER_BULK:
 778         case USB_ENDPOINT_XFER_INT:
 779                 trb->ctrl = DWC3_TRBCTL_NORMAL;
 780                 break;
 781         default:
 782                 /*
 783                  * This is only possible with faulty memory because we
 784                  * checked it already :)
 785                  */
 786                 BUG();
 787         }
 788
 789         if (!req->request.no_interrupt && !chain)
 790                 trb->ctrl |= DWC3_TRB_CTRL_IOC;
 791
 792         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 793                 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
 794                 trb->ctrl |= DWC3_TRB_CTRL_CSP;
 795         } else if (last) {
 796                 trb->ctrl |= DWC3_TRB_CTRL_LST;
 797         }
 798
 799         if (chain)
 800                 trb->ctrl |= DWC3_TRB_CTRL_CHN;
 801
 802         if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
 803                 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
 804
 805         trb->ctrl |= DWC3_TRB_CTRL_HWO;
 806
 807         trace_dwc3_prepare_trb(dep, trb);
 808 }
 809
 810 /*
 811  * dwc3_prepare_trbs - setup TRBs from requests
 812  * @dep: endpoint for which requests are being prepared
 813  * @starting: true if the endpoint is idle and no requests are queued.
 814  *
 815  * The function goes through the requests list and sets up TRBs for the
 816  * transfers. The function returns once there are no more TRBs available or
 817  * it runs out of requests.
 818  */
 819 static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting)
 820 {
 821         struct dwc3_request     *req, *n;
 822         u32                     trbs_left;
 823         u32                     max;
 824         unsigned int            last_one = 0;
 825
 826         BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
 827
 828         /* the first request must not be queued */
 829         trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
 830
 831         /* Can't wrap around on a non-isoc EP since there's no link TRB */
 832         if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 833                 max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK);
 834                 if (trbs_left > max)
 835                         trbs_left = max;
 836         }
 837
 838         /*
 839          * If busy & slot are equal than it is either full or empty. If we are
 840          * starting to process requests then we are empty. Otherwise we are
 841          * full and don't do anything
 842          */
 843         if (!trbs_left) {
 844                 if (!starting)
 845                         return;
 846                 trbs_left = DWC3_TRB_NUM;
 847                 /*
 848                  * In case we start from scratch, we queue the ISOC requests
 849                  * starting from slot 1. This is done because we use ring
 850                  * buffer and have no LST bit to stop us. Instead, we place
 851                  * IOC bit every TRB_NUM/4. We try to avoid having an interrupt
 852                  * after the first request so we start at slot 1 and have
 853                  * 7 requests proceed before we hit the first IOC.
 854                  * Other transfer types don't use the ring buffer and are
 855                  * processed from the first TRB until the last one. Since we
 856                  * don't wrap around we have to start at the beginning.
 857                  */
 858                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
 859                         dep->busy_slot = 1;
 860                         dep->free_slot = 1;
 861                 } else {
 862                         dep->busy_slot = 0;
 863                         dep->free_slot = 0;
 864                 }
 865         }
 866
 867         /* The last TRB is a link TRB, not used for xfer */
 868         if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc))
 869                 return;
 870
 871         list_for_each_entry_safe(req, n, &dep->request_list, list) {
 872                 unsigned        length;
 873                 dma_addr_t      dma;
 874                 last_one = false;
 875
 876                 if (req->request.num_mapped_sgs > 0) {
 877                         struct usb_request *request = &req->request;
 878                         struct scatterlist *sg = request->sg;
 879                         struct scatterlist *s;
 880                         int             i;
 881
 882                         for_each_sg(sg, s, request->num_mapped_sgs, i) {
 883                                 unsigned chain = true;
 884
 885                                 length = sg_dma_len(s);
 886                                 dma = sg_dma_address(s);
 887
 888                                 if (i == (request->num_mapped_sgs - 1) ||
 889                                                 sg_is_last(s)) {
 890                                         if (list_empty(&dep->request_list))
 891                                                 last_one = true;
 892                                         chain = false;
 893                                 }
 894
 895                                 trbs_left--;
 896                                 if (!trbs_left)
 897                                         last_one = true;
 898
 899                                 if (last_one)
 900                                         chain = false;
 901
 902                                 dwc3_prepare_one_trb(dep, req, dma, length,
 903                                                 last_one, chain, i);
 904
 905                                 if (last_one)
 906                                         break;
 907                         }
 908
 909                         if (last_one)
 910                                 break;
 911                 } else {
 912                         dma = req->request.dma;
 913                         length = req->request.length;
 914                         trbs_left--;
 915
 916                         if (!trbs_left)
 917                                 last_one = 1;
 918
 919                         /* Is this the last request? */
 920                         if (list_is_last(&req->list, &dep->request_list))
 921                                 last_one = 1;
 922
 923                         dwc3_prepare_one_trb(dep, req, dma, length,
 924                                         last_one, false, 0);
 925
 926                         if (last_one)
 927                                 break;
 928                 }
 929         }
 930 }
 931
 932 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
 933                 int start_new)
 934 {
 935         struct dwc3_gadget_ep_cmd_params params;
 936         struct dwc3_request             *req;
 937         struct dwc3                     *dwc = dep->dwc;
 938         int                             ret;
 939         u32                             cmd;
 940
 941         if (start_new && (dep->flags & DWC3_EP_BUSY)) {
 942                 dwc3_trace(trace_dwc3_gadget, "%s: endpoint busy", dep->name);
 943                 return -EBUSY;
 944         }
 945         dep->flags &= ~DWC3_EP_PENDING_REQUEST;
 946
 947         /*
 948          * If we are getting here after a short-out-packet we don't enqueue any
 949          * new requests as we try to set the IOC bit only on the last request.
 950          */
 951         if (start_new) {
 952                 if (list_empty(&dep->req_queued))
 953                         dwc3_prepare_trbs(dep, start_new);
 954
 955                 /* req points to the first request which will be sent */
 956                 req = next_request(&dep->req_queued);
 957         } else {
 958                 dwc3_prepare_trbs(dep, start_new);
 959
 960                 /*
 961                  * req points to the first request where HWO changed from 0 to 1
 962                  */
 963                 req = next_request(&dep->req_queued);
 964         }
 965         if (!req) {
 966                 dep->flags |= DWC3_EP_PENDING_REQUEST;
 967                 return 0;
 968         }
 969
 970         memset(&params, 0, sizeof(params));
 971
 972         if (start_new) {
 973                 params.param0 = upper_32_bits(req->trb_dma);
 974                 params.param1 = lower_32_bits(req->trb_dma);
 975                 cmd = DWC3_DEPCMD_STARTTRANSFER;
 976         } else {
 977                 cmd = DWC3_DEPCMD_UPDATETRANSFER;
 978         }
 979
 980         cmd |= DWC3_DEPCMD_PARAM(cmd_param);
 981         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
 982         if (ret < 0) {
 983                 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
 984
 985                 /*
 986                  * FIXME we need to iterate over the list of requests
 987                  * here and stop, unmap, free and del each of the linked
 988                  * requests instead of what we do now.
 989                  */
 990                 usb_gadget_unmap_request(&dwc->gadget, &req->request,
 991                                 req->direction);
 992                 list_del(&req->list);
 993                 return ret;
 994         }
 995
 996         dep->flags |= DWC3_EP_BUSY;
 997
 998         if (start_new) {
 999                 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
1000                                 dep->number);
1001                 WARN_ON_ONCE(!dep->resource_index);
1002         }
1003
1004         return 0;
1005 }
1006
1007 static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
1008                 struct dwc3_ep *dep, u32 cur_uf)
1009 {
1010         u32 uf;
1011
1012         if (list_empty(&dep->request_list)) {
1013                 dwc3_trace(trace_dwc3_gadget,
1014                                 "ISOC ep %s run out for requests",
1015                                 dep->name);
1016                 dep->flags |= DWC3_EP_PENDING_REQUEST;
1017                 return;
1018         }
1019
1020         /* 4 micro frames in the future */
1021         uf = cur_uf + dep->interval * 4;
1022
1023         __dwc3_gadget_kick_transfer(dep, uf, 1);
1024 }
1025
1026 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1027                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1028 {
1029         u32 cur_uf, mask;
1030
1031         mask = ~(dep->interval - 1);
1032         cur_uf = event->parameters & mask;
1033
1034         __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1035 }
1036
1037 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1038 {
1039         struct dwc3             *dwc = dep->dwc;
1040         int                     ret;
1041
1042         req->request.actual     = 0;
1043         req->request.status     = -EINPROGRESS;
1044         req->direction          = dep->direction;
1045         req->epnum              = dep->number;
1046
1047         /*
1048          * We only add to our list of requests now and
1049          * start consuming the list once we get XferNotReady
1050          * IRQ.
1051          *
1052          * That way, we avoid doing anything that we don't need
1053          * to do now and defer it until the point we receive a
1054          * particular token from the Host side.
1055          *
1056          * This will also avoid Host cancelling URBs due to too
1057          * many NAKs.
1058          */
1059         ret = usb_gadget_map_request(&dwc->gadget, &req->request,
1060                         dep->direction);
1061         if (ret)
1062                 return ret;
1063
1064         list_add_tail(&req->list, &dep->request_list);
1065
1066         /*
1067          * There are a few special cases:
1068          *
1069          * 1. XferNotReady with empty list of requests. We need to kick the
1070          *    transfer here in that situation, otherwise we will be NAKing
1071          *    forever. If we get XferNotReady before gadget driver has a
1072          *    chance to queue a request, we will ACK the IRQ but won't be
1073          *    able to receive the data until the next request is queued.
1074          *    The following code is handling exactly that.
1075          *
1076          */
1077         if (dep->flags & DWC3_EP_PENDING_REQUEST) {
1078                 /*
1079                  * If xfernotready is already elapsed and it is a case
1080                  * of isoc transfer, then issue END TRANSFER, so that
1081                  * you can receive xfernotready again and can have
1082                  * notion of current microframe.
1083                  */
1084                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1085                         if (list_empty(&dep->req_queued)) {
1086                                 dwc3_stop_active_transfer(dwc, dep->number, true);
1087                                 dep->flags = DWC3_EP_ENABLED;
1088                         }
1089                         return 0;
1090                 }
1091
1092                 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1093                 if (ret && ret != -EBUSY)
1094                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1095                                         dep->name);
1096                 return ret;
1097         }
1098
1099         /*
1100          * 2. XferInProgress on Isoc EP with an active transfer. We need to
1101          *    kick the transfer here after queuing a request, otherwise the
1102          *    core may not see the modified TRB(s).
1103          */
1104         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1105                         (dep->flags & DWC3_EP_BUSY) &&
1106                         !(dep->flags & DWC3_EP_MISSED_ISOC)) {
1107                 WARN_ON_ONCE(!dep->resource_index);
1108                 ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index,
1109                                 false);
1110                 if (ret && ret != -EBUSY)
1111                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1112                                         dep->name);
1113                 return ret;
1114         }
1115
1116         /*
1117          * 4. Stream Capable Bulk Endpoints. We need to start the transfer
1118          * right away, otherwise host will not know we have streams to be
1119          * handled.
1120          */
1121         if (dep->stream_capable) {
1122                 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1123                 if (ret && ret != -EBUSY)
1124                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1125                                         dep->name);
1126         }
1127
1128         return 0;
1129 }
1130
1131 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1132         gfp_t gfp_flags)
1133 {
1134         struct dwc3_request             *req = to_dwc3_request(request);
1135         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1136         struct dwc3                     *dwc = dep->dwc;
1137
1138         unsigned long                   flags;
1139
1140         int                             ret;
1141
1142         spin_lock_irqsave(&dwc->lock, flags);
1143         if (!dep->endpoint.desc) {
1144                 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
1145                                 request, ep->name);
1146                 ret = -ESHUTDOWN;
1147                 goto out;
1148         }
1149
1150         if (WARN(req->dep != dep, "request %p belongs to '%s'\n",
1151                                 request, req->dep->name)) {
1152                 ret = -EINVAL;
1153                 goto out;
1154         }
1155
1156         trace_dwc3_ep_queue(req);
1157
1158         ret = __dwc3_gadget_ep_queue(dep, req);
1159
1160 out:
1161         spin_unlock_irqrestore(&dwc->lock, flags);
1162
1163         return ret;
1164 }
1165
1166 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1167                 struct usb_request *request)
1168 {
1169         struct dwc3_request             *req = to_dwc3_request(request);
1170         struct dwc3_request             *r = NULL;
1171
1172         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1173         struct dwc3                     *dwc = dep->dwc;
1174
1175         unsigned long                   flags;
1176         int                             ret = 0;
1177
1178         trace_dwc3_ep_dequeue(req);
1179
1180         spin_lock_irqsave(&dwc->lock, flags);
1181
1182         list_for_each_entry(r, &dep->request_list, list) {
1183                 if (r == req)
1184                         break;
1185         }
1186
1187         if (r != req) {
1188                 list_for_each_entry(r, &dep->req_queued, list) {
1189                         if (r == req)
1190                                 break;
1191                 }
1192                 if (r == req) {
1193                         /* wait until it is processed */
1194                         dwc3_stop_active_transfer(dwc, dep->number, true);
1195                         goto out1;
1196                 }
1197                 dev_err(dwc->dev, "request %p was not queued to %s\n",
1198                                 request, ep->name);
1199                 ret = -EINVAL;
1200                 goto out0;
1201         }
1202
1203 out1:
1204         /* giveback the request */
1205         dwc3_gadget_giveback(dep, req, -ECONNRESET);
1206
1207 out0:
1208         spin_unlock_irqrestore(&dwc->lock, flags);
1209
1210         return ret;
1211 }
1212
1213 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
1214 {
1215         struct dwc3_gadget_ep_cmd_params        params;
1216         struct dwc3                             *dwc = dep->dwc;
1217         int                                     ret;
1218
1219         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1220                 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1221                 return -EINVAL;
1222         }
1223
1224         memset(&params, 0x00, sizeof(params));
1225
1226         if (value) {
1227                 if (!protocol && ((dep->direction && dep->flags & DWC3_EP_BUSY) ||
1228                                 (!list_empty(&dep->req_queued) ||
1229                                  !list_empty(&dep->request_list)))) {
1230                         dev_dbg(dwc->dev, "%s: pending request, cannot halt\n",
1231                                         dep->name);
1232                         return -EAGAIN;
1233                 }
1234
1235                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1236                         DWC3_DEPCMD_SETSTALL, &params);
1237                 if (ret)
1238                         dev_err(dwc->dev, "failed to set STALL on %s\n",
1239                                         dep->name);
1240                 else
1241                         dep->flags |= DWC3_EP_STALL;
1242         } else {
1243                 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1244                         DWC3_DEPCMD_CLEARSTALL, &params);
1245                 if (ret)
1246                         dev_err(dwc->dev, "failed to clear STALL on %s\n",
1247                                         dep->name);
1248                 else
1249                         dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1250         }
1251
1252         return ret;
1253 }
1254
1255 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1256 {
1257         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1258         struct dwc3                     *dwc = dep->dwc;
1259
1260         unsigned long                   flags;
1261
1262         int                             ret;
1263
1264         spin_lock_irqsave(&dwc->lock, flags);
1265         ret = __dwc3_gadget_ep_set_halt(dep, value, false);
1266         spin_unlock_irqrestore(&dwc->lock, flags);
1267
1268         return ret;
1269 }
1270
1271 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1272 {
1273         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1274         struct dwc3                     *dwc = dep->dwc;
1275         unsigned long                   flags;
1276         int                             ret;
1277
1278         spin_lock_irqsave(&dwc->lock, flags);
1279         dep->flags |= DWC3_EP_WEDGE;
1280
1281         if (dep->number == 0 || dep->number == 1)
1282                 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
1283         else
1284                 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
1285         spin_unlock_irqrestore(&dwc->lock, flags);
1286
1287         return ret;
1288 }
1289
1290 /* -------------------------------------------------------------------------- */
1291
1292 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1293         .bLength        = USB_DT_ENDPOINT_SIZE,
1294         .bDescriptorType = USB_DT_ENDPOINT,
1295         .bmAttributes   = USB_ENDPOINT_XFER_CONTROL,
1296 };
1297
1298 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1299         .enable         = dwc3_gadget_ep0_enable,
1300         .disable        = dwc3_gadget_ep0_disable,
1301         .alloc_request  = dwc3_gadget_ep_alloc_request,
1302         .free_request   = dwc3_gadget_ep_free_request,
1303         .queue          = dwc3_gadget_ep0_queue,
1304         .dequeue        = dwc3_gadget_ep_dequeue,
1305         .set_halt       = dwc3_gadget_ep0_set_halt,
1306         .set_wedge      = dwc3_gadget_ep_set_wedge,
1307 };
1308
1309 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1310         .enable         = dwc3_gadget_ep_enable,
1311         .disable        = dwc3_gadget_ep_disable,
1312         .alloc_request  = dwc3_gadget_ep_alloc_request,
1313         .free_request   = dwc3_gadget_ep_free_request,
1314         .queue          = dwc3_gadget_ep_queue,
1315         .dequeue        = dwc3_gadget_ep_dequeue,
1316         .set_halt       = dwc3_gadget_ep_set_halt,
1317         .set_wedge      = dwc3_gadget_ep_set_wedge,
1318 };
1319
1320 /* -------------------------------------------------------------------------- */
1321
1322 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1323 {
1324         struct dwc3             *dwc = gadget_to_dwc(g);
1325         u32                     reg;
1326
1327         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1328         return DWC3_DSTS_SOFFN(reg);
1329 }
1330
1331 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1332 {
1333         struct dwc3             *dwc = gadget_to_dwc(g);
1334
1335         unsigned long           timeout;
1336         unsigned long           flags;
1337
1338         u32                     reg;
1339
1340         int                     ret = 0;
1341
1342         u8                      link_state;
1343         u8                      speed;
1344
1345         spin_lock_irqsave(&dwc->lock, flags);
1346
1347         /*
1348          * According to the Databook Remote wakeup request should
1349          * be issued only when the device is in early suspend state.
1350          *
1351          * We can check that via USB Link State bits in DSTS register.
1352          */
1353         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1354
1355         speed = reg & DWC3_DSTS_CONNECTSPD;
1356         if (speed == DWC3_DSTS_SUPERSPEED) {
1357                 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n");
1358                 ret = -EINVAL;
1359                 goto out;
1360         }
1361
1362         link_state = DWC3_DSTS_USBLNKST(reg);
1363
1364         switch (link_state) {
1365         case DWC3_LINK_STATE_RX_DET:    /* in HS, means Early Suspend */
1366         case DWC3_LINK_STATE_U3:        /* in HS, means SUSPEND */
1367                 break;
1368         default:
1369                 dev_dbg(dwc->dev, "can't wakeup from link state %d\n",
1370                                 link_state);
1371                 ret = -EINVAL;
1372                 goto out;
1373         }
1374
1375         ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1376         if (ret < 0) {
1377                 dev_err(dwc->dev, "failed to put link in Recovery\n");
1378                 goto out;
1379         }
1380
1381         /* Recent versions do this automatically */
1382         if (dwc->revision < DWC3_REVISION_194A) {
1383                 /* write zeroes to Link Change Request */
1384                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1385                 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1386                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1387         }
1388
1389         /* poll until Link State changes to ON */
1390         timeout = jiffies + msecs_to_jiffies(100);
1391
1392         while (!time_after(jiffies, timeout)) {
1393                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1394
1395                 /* in HS, means ON */
1396                 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1397                         break;
1398         }
1399
1400         if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1401                 dev_err(dwc->dev, "failed to send remote wakeup\n");
1402                 ret = -EINVAL;
1403         }
1404
1405 out:
1406         spin_unlock_irqrestore(&dwc->lock, flags);
1407
1408         return ret;
1409 }
1410
1411 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1412                 int is_selfpowered)
1413 {
1414         struct dwc3             *dwc = gadget_to_dwc(g);
1415         unsigned long           flags;
1416
1417         spin_lock_irqsave(&dwc->lock, flags);
1418         g->is_selfpowered = !!is_selfpowered;
1419         spin_unlock_irqrestore(&dwc->lock, flags);
1420
1421         return 0;
1422 }
1423
1424 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
1425 {
1426         u32                     reg;
1427         u32                     timeout = 500;
1428
1429         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1430         if (is_on) {
1431                 if (dwc->revision <= DWC3_REVISION_187A) {
1432                         reg &= ~DWC3_DCTL_TRGTULST_MASK;
1433                         reg |= DWC3_DCTL_TRGTULST_RX_DET;
1434                 }
1435
1436                 if (dwc->revision >= DWC3_REVISION_194A)
1437                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1438                 reg |= DWC3_DCTL_RUN_STOP;
1439
1440                 if (dwc->has_hibernation)
1441                         reg |= DWC3_DCTL_KEEP_CONNECT;
1442
1443                 dwc->pullups_connected = true;
1444         } else {
1445                 reg &= ~DWC3_DCTL_RUN_STOP;
1446
1447                 if (dwc->has_hibernation && !suspend)
1448                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1449
1450                 dwc->pullups_connected = false;
1451         }
1452
1453         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1454
1455         do {
1456                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1457                 if (is_on) {
1458                         if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1459                                 break;
1460                 } else {
1461                         if (reg & DWC3_DSTS_DEVCTRLHLT)
1462                                 break;
1463                 }
1464                 timeout--;
1465                 if (!timeout)
1466                         return -ETIMEDOUT;
1467                 udelay(1);
1468         } while (1);
1469
1470         dwc3_trace(trace_dwc3_gadget, "gadget %s data soft-%s",
1471                         dwc->gadget_driver
1472                         ? dwc->gadget_driver->function : "no-function",
1473                         is_on ? "connect" : "disconnect");
1474
1475         return 0;
1476 }
1477
1478 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1479 {
1480         struct dwc3             *dwc = gadget_to_dwc(g);
1481         unsigned long           flags;
1482         int                     ret;
1483
1484         is_on = !!is_on;
1485
1486         spin_lock_irqsave(&dwc->lock, flags);
1487         ret = dwc3_gadget_run_stop(dwc, is_on, false);
1488         spin_unlock_irqrestore(&dwc->lock, flags);
1489
1490         return ret;
1491 }
1492
1493 static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1494 {
1495         u32                     reg;
1496
1497         /* Enable all but Start and End of Frame IRQs */
1498         reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1499                         DWC3_DEVTEN_EVNTOVERFLOWEN |
1500                         DWC3_DEVTEN_CMDCMPLTEN |
1501                         DWC3_DEVTEN_ERRTICERREN |
1502                         DWC3_DEVTEN_WKUPEVTEN |
1503                         DWC3_DEVTEN_ULSTCNGEN |
1504                         DWC3_DEVTEN_CONNECTDONEEN |
1505                         DWC3_DEVTEN_USBRSTEN |
1506                         DWC3_DEVTEN_DISCONNEVTEN);
1507
1508         dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1509 }
1510
1511 static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1512 {
1513         /* mask all interrupts */
1514         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1515 }
1516
1517 static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1518 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1519
1520 static int dwc3_gadget_start(struct usb_gadget *g,
1521                 struct usb_gadget_driver *driver)
1522 {
1523         struct dwc3             *dwc = gadget_to_dwc(g);
1524         struct dwc3_ep          *dep;
1525         unsigned long           flags;
1526         int                     ret = 0;
1527         int                     irq;
1528         u32                     reg;
1529
1530         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1531         ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
1532                         IRQF_SHARED, "dwc3", dwc);
1533         if (ret) {
1534                 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
1535                                 irq, ret);
1536                 goto err0;
1537         }
1538
1539         spin_lock_irqsave(&dwc->lock, flags);
1540
1541         if (dwc->gadget_driver) {
1542                 dev_err(dwc->dev, "%s is already bound to %s\n",
1543                                 dwc->gadget.name,
1544                                 dwc->gadget_driver->driver.name);
1545                 ret = -EBUSY;
1546                 goto err1;
1547         }
1548
1549         dwc->gadget_driver      = driver;
1550
1551         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1552         reg &= ~(DWC3_DCFG_SPEED_MASK);
1553
1554         /**
1555          * WORKAROUND: DWC3 revision < 2.20a have an issue
1556          * which would cause metastability state on Run/Stop
1557          * bit if we try to force the IP to USB2-only mode.
1558          *
1559          * Because of that, we cannot configure the IP to any
1560          * speed other than the SuperSpeed
1561          *
1562          * Refers to:
1563          *
1564          * STAR#9000525659: Clock Domain Crossing on DCTL in
1565          * USB 2.0 Mode
1566          */
1567         if (dwc->revision < DWC3_REVISION_220A) {
1568                 reg |= DWC3_DCFG_SUPERSPEED;
1569         } else {
1570                 switch (dwc->maximum_speed) {
1571                 case USB_SPEED_LOW:
1572                         reg |= DWC3_DSTS_LOWSPEED;
1573                         break;
1574                 case USB_SPEED_FULL:
1575                         reg |= DWC3_DSTS_FULLSPEED1;
1576                         break;
1577                 case USB_SPEED_HIGH:
1578                         reg |= DWC3_DSTS_HIGHSPEED;
1579                         break;
1580                 case USB_SPEED_SUPER:   /* FALLTHROUGH */
1581                 case USB_SPEED_UNKNOWN: /* FALTHROUGH */
1582                 default:
1583                         reg |= DWC3_DSTS_SUPERSPEED;
1584                 }
1585         }
1586         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1587
1588         dwc->start_config_issued = false;
1589
1590         /* Start with SuperSpeed Default */
1591         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1592
1593         dep = dwc->eps[0];
1594         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1595                         false);
1596         if (ret) {
1597                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1598                 goto err2;
1599         }
1600
1601         dep = dwc->eps[1];
1602         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1603                         false);
1604         if (ret) {
1605                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1606                 goto err3;
1607         }
1608
1609         /* begin to receive SETUP packets */
1610         dwc->ep0state = EP0_SETUP_PHASE;
1611         dwc3_ep0_out_start(dwc);
1612
1613         dwc3_gadget_enable_irq(dwc);
1614
1615         spin_unlock_irqrestore(&dwc->lock, flags);
1616
1617         return 0;
1618
1619 err3:
1620         __dwc3_gadget_ep_disable(dwc->eps[0]);
1621
1622 err2:
1623         dwc->gadget_driver = NULL;
1624
1625 err1:
1626         spin_unlock_irqrestore(&dwc->lock, flags);
1627
1628         free_irq(irq, dwc);
1629
1630 err0:
1631         return ret;
1632 }
1633
1634 static int dwc3_gadget_stop(struct usb_gadget *g)
1635 {
1636         struct dwc3             *dwc = gadget_to_dwc(g);
1637         unsigned long           flags;
1638         int                     irq;
1639
1640         spin_lock_irqsave(&dwc->lock, flags);
1641
1642         dwc3_gadget_disable_irq(dwc);
1643         __dwc3_gadget_ep_disable(dwc->eps[0]);
1644         __dwc3_gadget_ep_disable(dwc->eps[1]);
1645
1646         dwc->gadget_driver      = NULL;
1647
1648         spin_unlock_irqrestore(&dwc->lock, flags);
1649
1650         irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1651         free_irq(irq, dwc);
1652
1653         return 0;
1654 }
1655
1656 static const struct usb_gadget_ops dwc3_gadget_ops = {
1657         .get_frame              = dwc3_gadget_get_frame,
1658         .wakeup                 = dwc3_gadget_wakeup,
1659         .set_selfpowered        = dwc3_gadget_set_selfpowered,
1660         .pullup                 = dwc3_gadget_pullup,
1661         .udc_start              = dwc3_gadget_start,
1662         .udc_stop               = dwc3_gadget_stop,
1663 };
1664
1665 /* -------------------------------------------------------------------------- */
1666
1667 static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1668                 u8 num, u32 direction)
1669 {
1670         struct dwc3_ep                  *dep;
1671         u8                              i;
1672
1673         for (i = 0; i < num; i++) {
1674                 u8 epnum = (i << 1) | (!!direction);
1675
1676                 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1677                 if (!dep)
1678                         return -ENOMEM;
1679
1680                 dep->dwc = dwc;
1681                 dep->number = epnum;
1682                 dep->direction = !!direction;
1683                 dwc->eps[epnum] = dep;
1684
1685                 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1686                                 (epnum & 1) ? "in" : "out");
1687
1688                 dep->endpoint.name = dep->name;
1689
1690                 dwc3_trace(trace_dwc3_gadget, "initializing %s", dep->name);
1691
1692                 if (epnum == 0 || epnum == 1) {
1693                         usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
1694                         dep->endpoint.maxburst = 1;
1695                         dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1696                         if (!epnum)
1697                                 dwc->gadget.ep0 = &dep->endpoint;
1698                 } else {
1699                         int             ret;
1700
1701                         usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
1702                         dep->endpoint.max_streams = 15;
1703                         dep->endpoint.ops = &dwc3_gadget_ep_ops;
1704                         list_add_tail(&dep->endpoint.ep_list,
1705                                         &dwc->gadget.ep_list);
1706
1707                         ret = dwc3_alloc_trb_pool(dep);
1708                         if (ret)
1709                                 return ret;
1710                 }
1711
1712                 INIT_LIST_HEAD(&dep->request_list);
1713                 INIT_LIST_HEAD(&dep->req_queued);
1714         }
1715
1716         return 0;
1717 }
1718
1719 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1720 {
1721         int                             ret;
1722
1723         INIT_LIST_HEAD(&dwc->gadget.ep_list);
1724
1725         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1726         if (ret < 0) {
1727                 dwc3_trace(trace_dwc3_gadget,
1728                                 "failed to allocate OUT endpoints");
1729                 return ret;
1730         }
1731
1732         ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1733         if (ret < 0) {
1734                 dwc3_trace(trace_dwc3_gadget,
1735                                 "failed to allocate IN endpoints");
1736                 return ret;
1737         }
1738
1739         return 0;
1740 }
1741
1742 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1743 {
1744         struct dwc3_ep                  *dep;
1745         u8                              epnum;
1746
1747         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1748                 dep = dwc->eps[epnum];
1749                 if (!dep)
1750                         continue;
1751                 /*
1752                  * Physical endpoints 0 and 1 are special; they form the
1753                  * bi-directional USB endpoint 0.
1754                  *
1755                  * For those two physical endpoints, we don't allocate a TRB
1756                  * pool nor do we add them the endpoints list. Due to that, we
1757                  * shouldn't do these two operations otherwise we would end up
1758                  * with all sorts of bugs when removing dwc3.ko.
1759                  */
1760                 if (epnum != 0 && epnum != 1) {
1761                         dwc3_free_trb_pool(dep);
1762                         list_del(&dep->endpoint.ep_list);
1763                 }
1764
1765                 kfree(dep);
1766         }
1767 }
1768
1769 /* -------------------------------------------------------------------------- */
1770
1771 static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
1772                 struct dwc3_request *req, struct dwc3_trb *trb,
1773                 const struct dwc3_event_depevt *event, int status)
1774 {
1775         unsigned int            count;
1776         unsigned int            s_pkt = 0;
1777         unsigned int            trb_status;
1778
1779         trace_dwc3_complete_trb(dep, trb);
1780
1781         if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
1782                 /*
1783                  * We continue despite the error. There is not much we
1784                  * can do. If we don't clean it up we loop forever. If
1785                  * we skip the TRB then it gets overwritten after a
1786                  * while since we use them in a ring buffer. A BUG()
1787                  * would help. Lets hope that if this occurs, someone
1788                  * fixes the root cause instead of looking away :)
1789                  */
1790                 dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1791                                 dep->name, trb);
1792         count = trb->size & DWC3_TRB_SIZE_MASK;
1793
1794         if (dep->direction) {
1795                 if (count) {
1796                         trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
1797                         if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
1798                                 dev_dbg(dwc->dev, "incomplete IN transfer %s\n",
1799                                                 dep->name);
1800                                 /*
1801                                  * If missed isoc occurred and there is
1802                                  * no request queued then issue END
1803                                  * TRANSFER, so that core generates
1804                                  * next xfernotready and we will issue
1805                                  * a fresh START TRANSFER.
1806                                  * If there are still queued request
1807                                  * then wait, do not issue either END
1808                                  * or UPDATE TRANSFER, just attach next
1809                                  * request in request_list during
1810                                  * giveback.If any future queued request
1811                                  * is successfully transferred then we
1812                                  * will issue UPDATE TRANSFER for all
1813                                  * request in the request_list.
1814                                  */
1815                                 dep->flags |= DWC3_EP_MISSED_ISOC;
1816                         } else {
1817                                 dev_err(dwc->dev, "incomplete IN transfer %s\n",
1818                                                 dep->name);
1819                                 status = -ECONNRESET;
1820                         }
1821                 } else {
1822                         dep->flags &= ~DWC3_EP_MISSED_ISOC;
1823                 }
1824         } else {
1825                 if (count && (event->status & DEPEVT_STATUS_SHORT))
1826                         s_pkt = 1;
1827         }
1828
1829         /*
1830          * We assume here we will always receive the entire data block
1831          * which we should receive. Meaning, if we program RX to
1832          * receive 4K but we receive only 2K, we assume that's all we
1833          * should receive and we simply bounce the request back to the
1834          * gadget driver for further processing.
1835          */
1836         req->request.actual += req->request.length - count;
1837         if (s_pkt)
1838                 return 1;
1839         if ((event->status & DEPEVT_STATUS_LST) &&
1840                         (trb->ctrl & (DWC3_TRB_CTRL_LST |
1841                                 DWC3_TRB_CTRL_HWO)))
1842                 return 1;
1843         if ((event->status & DEPEVT_STATUS_IOC) &&
1844                         (trb->ctrl & DWC3_TRB_CTRL_IOC))
1845                 return 1;
1846         return 0;
1847 }
1848
1849 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1850                 const struct dwc3_event_depevt *event, int status)
1851 {
1852         struct dwc3_request     *req;
1853         struct dwc3_trb         *trb;
1854         unsigned int            slot;
1855         unsigned int            i;
1856         int                     ret;
1857
1858         req = next_request(&dep->req_queued);
1859         if (!req) {
1860                 WARN_ON_ONCE(1);
1861                 return 1;
1862         }
1863         i = 0;
1864         do {
1865                 slot = req->start_slot + i;
1866                 if ((slot == DWC3_TRB_NUM - 1) &&
1867                                 usb_endpoint_xfer_isoc(dep->endpoint.desc))
1868                         slot++;
1869                 slot %= DWC3_TRB_NUM;
1870                 trb = &dep->trb_pool[slot];
1871
1872                 ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
1873                                 event, status);
1874                 if (ret)
1875                         break;
1876         } while (++i < req->request.num_mapped_sgs);
1877
1878         dwc3_gadget_giveback(dep, req, status);
1879
1880         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1881                         list_empty(&dep->req_queued)) {
1882                 if (list_empty(&dep->request_list)) {
1883                         /*
1884                          * If there is no entry in request list then do
1885                          * not issue END TRANSFER now. Just set PENDING
1886                          * flag, so that END TRANSFER is issued when an
1887                          * entry is added into request list.
1888                          */
1889                         dep->flags = DWC3_EP_PENDING_REQUEST;
1890                 } else {
1891                         dwc3_stop_active_transfer(dwc, dep->number, true);
1892                         dep->flags = DWC3_EP_ENABLED;
1893                 }
1894                 return 1;
1895         }
1896
1897         return 1;
1898 }
1899
1900 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
1901                 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1902 {
1903         unsigned                status = 0;
1904         int                     clean_busy;
1905
1906         if (event->status & DEPEVT_STATUS_BUSERR)
1907                 status = -ECONNRESET;
1908
1909         clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
1910         if (clean_busy)
1911                 dep->flags &= ~DWC3_EP_BUSY;
1912
1913         /*
1914          * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
1915          * See dwc3_gadget_linksts_change_interrupt() for 1st half.
1916          */
1917         if (dwc->revision < DWC3_REVISION_183A) {
1918                 u32             reg;
1919                 int             i;
1920
1921                 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
1922                         dep = dwc->eps[i];
1923
1924                         if (!(dep->flags & DWC3_EP_ENABLED))
1925                                 continue;
1926
1927                         if (!list_empty(&dep->req_queued))
1928                                 return;
1929                 }
1930
1931                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1932                 reg |= dwc->u1u2;
1933                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1934
1935                 dwc->u1u2 = 0;
1936         }
1937 }
1938
1939 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
1940                 const struct dwc3_event_depevt *event)
1941 {
1942         struct dwc3_ep          *dep;
1943         u8                      epnum = event->endpoint_number;
1944
1945         dep = dwc->eps[epnum];
1946
1947         if (!(dep->flags & DWC3_EP_ENABLED))
1948                 return;
1949
1950         if (epnum == 0 || epnum == 1) {
1951                 dwc3_ep0_interrupt(dwc, event);
1952                 return;
1953         }
1954
1955         switch (event->endpoint_event) {
1956         case DWC3_DEPEVT_XFERCOMPLETE:
1957                 dep->resource_index = 0;
1958
1959                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1960                         dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n",
1961                                         dep->name);
1962                         return;
1963                 }
1964
1965                 dwc3_endpoint_transfer_complete(dwc, dep, event);
1966                 break;
1967         case DWC3_DEPEVT_XFERINPROGRESS:
1968                 dwc3_endpoint_transfer_complete(dwc, dep, event);
1969                 break;
1970         case DWC3_DEPEVT_XFERNOTREADY:
1971                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1972                         dwc3_gadget_start_isoc(dwc, dep, event);
1973                 } else {
1974                         int ret;
1975
1976                         dwc3_trace(trace_dwc3_gadget, "%s: reason %s",
1977                                         dep->name, event->status &
1978                                         DEPEVT_STATUS_TRANSFER_ACTIVE
1979                                         ? "Transfer Active"
1980                                         : "Transfer Not Active");
1981
1982                         ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
1983                         if (!ret || ret == -EBUSY)
1984                                 return;
1985
1986                         dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1987                                         dep->name);
1988                 }
1989
1990                 break;
1991         case DWC3_DEPEVT_STREAMEVT:
1992                 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
1993                         dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
1994                                         dep->name);
1995                         return;
1996                 }
1997
1998                 switch (event->status) {
1999                 case DEPEVT_STREAMEVT_FOUND:
2000                         dwc3_trace(trace_dwc3_gadget,
2001                                         "Stream %d found and started",
2002                                         event->parameters);
2003
2004                         break;
2005                 case DEPEVT_STREAMEVT_NOTFOUND:
2006                         /* FALLTHROUGH */
2007                 default:
2008                         dev_dbg(dwc->dev, "Couldn't find suitable stream\n");
2009                 }
2010                 break;
2011         case DWC3_DEPEVT_RXTXFIFOEVT:
2012                 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name);
2013                 break;
2014         case DWC3_DEPEVT_EPCMDCMPLT:
2015                 dwc3_trace(trace_dwc3_gadget, "Endpoint Command Complete");
2016                 break;
2017         }
2018 }
2019
2020 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
2021 {
2022         if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
2023                 spin_unlock(&dwc->lock);
2024                 dwc->gadget_driver->disconnect(&dwc->gadget);
2025                 spin_lock(&dwc->lock);
2026         }
2027 }
2028
2029 static void dwc3_suspend_gadget(struct dwc3 *dwc)
2030 {
2031         if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
2032                 spin_unlock(&dwc->lock);
2033                 dwc->gadget_driver->suspend(&dwc->gadget);
2034                 spin_lock(&dwc->lock);
2035         }
2036 }
2037
2038 static void dwc3_resume_gadget(struct dwc3 *dwc)
2039 {
2040         if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2041                 spin_unlock(&dwc->lock);
2042                 dwc->gadget_driver->resume(&dwc->gadget);
2043                 spin_lock(&dwc->lock);
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 arbitrary 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                         dwc3_trace(trace_dwc3_gadget,
2391                                         "ignoring transition U3 -> Resume");
2392                         return;
2393                 }
2394         }
2395
2396         /*
2397          * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2398          * on the link partner, the USB session might do multiple entry/exit
2399          * of low power states before a transfer takes place.
2400          *
2401          * Due to this problem, we might experience lower throughput. The
2402          * suggested workaround is to disable DCTL[12:9] bits if we're
2403          * transitioning from U1/U2 to U0 and enable those bits again
2404          * after a transfer completes and there are no pending transfers
2405          * on any of the enabled endpoints.
2406          *
2407          * This is the first half of that workaround.
2408          *
2409          * Refers to:
2410          *
2411          * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2412          * core send LGO_Ux entering U0
2413          */
2414         if (dwc->revision < DWC3_REVISION_183A) {
2415                 if (next == DWC3_LINK_STATE_U0) {
2416                         u32     u1u2;
2417                         u32     reg;
2418
2419                         switch (dwc->link_state) {
2420                         case DWC3_LINK_STATE_U1:
2421                         case DWC3_LINK_STATE_U2:
2422                                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2423                                 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2424                                                 | DWC3_DCTL_ACCEPTU2ENA
2425                                                 | DWC3_DCTL_INITU1ENA
2426                                                 | DWC3_DCTL_ACCEPTU1ENA);
2427
2428                                 if (!dwc->u1u2)
2429                                         dwc->u1u2 = reg & u1u2;
2430
2431                                 reg &= ~u1u2;
2432
2433                                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2434                                 break;
2435                         default:
2436                                 /* do nothing */
2437                                 break;
2438                         }
2439                 }
2440         }
2441
2442         switch (next) {
2443         case DWC3_LINK_STATE_U1:
2444                 if (dwc->speed == USB_SPEED_SUPER)
2445                         dwc3_suspend_gadget(dwc);
2446                 break;
2447         case DWC3_LINK_STATE_U2:
2448         case DWC3_LINK_STATE_U3:
2449                 dwc3_suspend_gadget(dwc);
2450                 break;
2451         case DWC3_LINK_STATE_RESUME:
2452                 dwc3_resume_gadget(dwc);
2453                 break;
2454         default:
2455                 /* do nothing */
2456                 break;
2457         }
2458
2459         dwc->link_state = next;
2460 }
2461
2462 static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
2463                 unsigned int evtinfo)
2464 {
2465         unsigned int is_ss = evtinfo & BIT(4);
2466
2467         /**
2468          * WORKAROUND: DWC3 revison 2.20a with hibernation support
2469          * have a known issue which can cause USB CV TD.9.23 to fail
2470          * randomly.
2471          *
2472          * Because of this issue, core could generate bogus hibernation
2473          * events which SW needs to ignore.
2474          *
2475          * Refers to:
2476          *
2477          * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
2478          * Device Fallback from SuperSpeed
2479          */
2480         if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
2481                 return;
2482
2483         /* enter hibernation here */
2484 }
2485
2486 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2487                 const struct dwc3_event_devt *event)
2488 {
2489         switch (event->type) {
2490         case DWC3_DEVICE_EVENT_DISCONNECT:
2491                 dwc3_gadget_disconnect_interrupt(dwc);
2492                 break;
2493         case DWC3_DEVICE_EVENT_RESET:
2494                 dwc3_gadget_reset_interrupt(dwc);
2495                 break;
2496         case DWC3_DEVICE_EVENT_CONNECT_DONE:
2497                 dwc3_gadget_conndone_interrupt(dwc);
2498                 break;
2499         case DWC3_DEVICE_EVENT_WAKEUP:
2500                 dwc3_gadget_wakeup_interrupt(dwc);
2501                 break;
2502         case DWC3_DEVICE_EVENT_HIBER_REQ:
2503                 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
2504                                         "unexpected hibernation event\n"))
2505                         break;
2506
2507                 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
2508                 break;
2509         case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2510                 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2511                 break;
2512         case DWC3_DEVICE_EVENT_EOPF:
2513                 dwc3_trace(trace_dwc3_gadget, "End of Periodic Frame");
2514                 break;
2515         case DWC3_DEVICE_EVENT_SOF:
2516                 dwc3_trace(trace_dwc3_gadget, "Start of Periodic Frame");
2517                 break;
2518         case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2519                 dwc3_trace(trace_dwc3_gadget, "Erratic Error");
2520                 break;
2521         case DWC3_DEVICE_EVENT_CMD_CMPL:
2522                 dwc3_trace(trace_dwc3_gadget, "Command Complete");
2523                 break;
2524         case DWC3_DEVICE_EVENT_OVERFLOW:
2525                 dwc3_trace(trace_dwc3_gadget, "Overflow");
2526                 break;
2527         default:
2528                 dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2529         }
2530 }
2531
2532 static void dwc3_process_event_entry(struct dwc3 *dwc,
2533                 const union dwc3_event *event)
2534 {
2535         trace_dwc3_event(event->raw);
2536
2537         /* Endpoint IRQ, handle it and return early */
2538         if (event->type.is_devspec == 0) {
2539                 /* depevt */
2540                 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2541         }
2542
2543         switch (event->type.type) {
2544         case DWC3_EVENT_TYPE_DEV:
2545                 dwc3_gadget_interrupt(dwc, &event->devt);
2546                 break;
2547         /* REVISIT what to do with Carkit and I2C events ? */
2548         default:
2549                 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2550         }
2551 }
2552
2553 static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
2554 {
2555         struct dwc3_event_buffer *evt;
2556         irqreturn_t ret = IRQ_NONE;
2557         int left;
2558         u32 reg;
2559
2560         evt = dwc->ev_buffs[buf];
2561         left = evt->count;
2562
2563         if (!(evt->flags & DWC3_EVENT_PENDING))
2564                 return IRQ_NONE;
2565
2566         while (left > 0) {
2567                 union dwc3_event event;
2568
2569                 event.raw = *(u32 *) (evt->buf + evt->lpos);
2570
2571                 dwc3_process_event_entry(dwc, &event);
2572
2573                 /*
2574                  * FIXME we wrap around correctly to the next entry as
2575                  * almost all entries are 4 bytes in size. There is one
2576                  * entry which has 12 bytes which is a regular entry
2577                  * followed by 8 bytes data. ATM I don't know how
2578                  * things are organized if we get next to the a
2579                  * boundary so I worry about that once we try to handle
2580                  * that.
2581                  */
2582                 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
2583                 left -= 4;
2584
2585                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4);
2586         }
2587
2588         evt->count = 0;
2589         evt->flags &= ~DWC3_EVENT_PENDING;
2590         ret = IRQ_HANDLED;
2591
2592         /* Unmask interrupt */
2593         reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2594         reg &= ~DWC3_GEVNTSIZ_INTMASK;
2595         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2596
2597         return ret;
2598 }
2599
2600 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
2601 {
2602         struct dwc3 *dwc = _dwc;
2603         unsigned long flags;
2604         irqreturn_t ret = IRQ_NONE;
2605         int i;
2606
2607         spin_lock_irqsave(&dwc->lock, flags);
2608
2609         for (i = 0; i < dwc->num_event_buffers; i++)
2610                 ret |= dwc3_process_event_buf(dwc, i);
2611
2612         spin_unlock_irqrestore(&dwc->lock, flags);
2613
2614         return ret;
2615 }
2616
2617 static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc, u32 buf)
2618 {
2619         struct dwc3_event_buffer *evt;
2620         u32 count;
2621         u32 reg;
2622
2623         evt = dwc->ev_buffs[buf];
2624
2625         count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
2626         count &= DWC3_GEVNTCOUNT_MASK;
2627         if (!count)
2628                 return IRQ_NONE;
2629
2630         evt->count = count;
2631         evt->flags |= DWC3_EVENT_PENDING;
2632
2633         /* Mask interrupt */
2634         reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2635         reg |= DWC3_GEVNTSIZ_INTMASK;
2636         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2637
2638         return IRQ_WAKE_THREAD;
2639 }
2640
2641 static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
2642 {
2643         struct dwc3                     *dwc = _dwc;
2644         int                             i;
2645         irqreturn_t                     ret = IRQ_NONE;
2646
2647         spin_lock(&dwc->lock);
2648
2649         for (i = 0; i < dwc->num_event_buffers; i++) {
2650                 irqreturn_t status;
2651
2652                 status = dwc3_check_event_buf(dwc, i);
2653                 if (status == IRQ_WAKE_THREAD)
2654                         ret = status;
2655         }
2656
2657         spin_unlock(&dwc->lock);
2658
2659         return ret;
2660 }
2661
2662 /**
2663  * dwc3_gadget_init - Initializes gadget related registers
2664  * @dwc: pointer to our controller context structure
2665  *
2666  * Returns 0 on success otherwise negative errno.
2667  */
2668 int dwc3_gadget_init(struct dwc3 *dwc)
2669 {
2670         int                                     ret;
2671
2672         dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2673                         &dwc->ctrl_req_addr, GFP_KERNEL);
2674         if (!dwc->ctrl_req) {
2675                 dev_err(dwc->dev, "failed to allocate ctrl request\n");
2676                 ret = -ENOMEM;
2677                 goto err0;
2678         }
2679
2680         dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2681                         &dwc->ep0_trb_addr, GFP_KERNEL);
2682         if (!dwc->ep0_trb) {
2683                 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
2684                 ret = -ENOMEM;
2685                 goto err1;
2686         }
2687
2688         dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
2689         if (!dwc->setup_buf) {
2690                 ret = -ENOMEM;
2691                 goto err2;
2692         }
2693
2694         dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
2695                         DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
2696                         GFP_KERNEL);
2697         if (!dwc->ep0_bounce) {
2698                 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
2699                 ret = -ENOMEM;
2700                 goto err3;
2701         }
2702
2703         dwc->gadget.ops                 = &dwc3_gadget_ops;
2704         dwc->gadget.max_speed           = USB_SPEED_SUPER;
2705         dwc->gadget.speed               = USB_SPEED_UNKNOWN;
2706         dwc->gadget.sg_supported        = true;
2707         dwc->gadget.name                = "dwc3-gadget";
2708
2709         /*
2710          * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
2711          * on ep out.
2712          */
2713         dwc->gadget.quirk_ep_out_aligned_size = true;
2714
2715         /*
2716          * REVISIT: Here we should clear all pending IRQs to be
2717          * sure we're starting from a well known location.
2718          */
2719
2720         ret = dwc3_gadget_init_endpoints(dwc);
2721         if (ret)
2722                 goto err4;
2723
2724         ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
2725         if (ret) {
2726                 dev_err(dwc->dev, "failed to register udc\n");
2727                 goto err4;
2728         }
2729
2730         return 0;
2731
2732 err4:
2733         dwc3_gadget_free_endpoints(dwc);
2734         dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2735                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
2736
2737 err3:
2738         kfree(dwc->setup_buf);
2739
2740 err2:
2741         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2742                         dwc->ep0_trb, dwc->ep0_trb_addr);
2743
2744 err1:
2745         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2746                         dwc->ctrl_req, dwc->ctrl_req_addr);
2747
2748 err0:
2749         return ret;
2750 }
2751
2752 /* -------------------------------------------------------------------------- */
2753
2754 void dwc3_gadget_exit(struct dwc3 *dwc)
2755 {
2756         usb_del_gadget_udc(&dwc->gadget);
2757
2758         dwc3_gadget_free_endpoints(dwc);
2759
2760         dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2761                         dwc->ep0_bounce, dwc->ep0_bounce_addr);
2762
2763         kfree(dwc->setup_buf);
2764
2765         dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2766                         dwc->ep0_trb, dwc->ep0_trb_addr);
2767
2768         dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2769                         dwc->ctrl_req, dwc->ctrl_req_addr);
2770 }
2771
2772 int dwc3_gadget_suspend(struct dwc3 *dwc)
2773 {
2774         if (dwc->pullups_connected) {
2775                 dwc3_gadget_disable_irq(dwc);
2776                 dwc3_gadget_run_stop(dwc, true, true);
2777         }
2778
2779         __dwc3_gadget_ep_disable(dwc->eps[0]);
2780         __dwc3_gadget_ep_disable(dwc->eps[1]);
2781
2782         dwc->dcfg = dwc3_readl(dwc->regs, DWC3_DCFG);
2783
2784         return 0;
2785 }
2786
2787 int dwc3_gadget_resume(struct dwc3 *dwc)
2788 {
2789         struct dwc3_ep          *dep;
2790         int                     ret;
2791
2792         /* Start with SuperSpeed Default */
2793         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2794
2795         dep = dwc->eps[0];
2796         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
2797                         false);
2798         if (ret)
2799                 goto err0;
2800
2801         dep = dwc->eps[1];
2802         ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
2803                         false);
2804         if (ret)
2805                 goto err1;
2806
2807         /* begin to receive SETUP packets */
2808         dwc->ep0state = EP0_SETUP_PHASE;
2809         dwc3_ep0_out_start(dwc);
2810
2811         dwc3_writel(dwc->regs, DWC3_DCFG, dwc->dcfg);
2812
2813         if (dwc->pullups_connected) {
2814                 dwc3_gadget_enable_irq(dwc);
2815                 dwc3_gadget_run_stop(dwc, true, false);
2816         }
2817
2818         return 0;
2819
2820 err1:
2821         __dwc3_gadget_ep_disable(dwc->eps[0]);
2822
2823 err0:
2824         return ret;
2825 }