drivers/usb/dwc3/gadget.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
   4  *
   5  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   6  *
   7  * Authors: Felipe Balbi <[email protected]>,
   8  *          Sebastian Andrzej Siewior <[email protected]>
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/delay.h>
  13 #include <linux/slab.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/io.h>
  19 #include <linux/list.h>
  20 #include <linux/dma-mapping.h>
  21
  22 #include <linux/usb/ch9.h>
  23 #include <linux/usb/gadget.h>
  24
  25 #include "debug.h"
  26 #include "core.h"
  27 #include "gadget.h"
  28 #include "io.h"
  29
  30 #define DWC3_ALIGN_FRAME(d, n)  (((d)->frame_number + ((d)->interval * (n))) \
  31                                         & ~((d)->interval - 1))
  32
  33 /**
  34  * dwc3_gadget_set_test_mode - enables usb2 test modes
  35  * @dwc: pointer to our context structure
  36  * @mode: the mode to set (J, K SE0 NAK, Force Enable)
  37  *
  38  * Caller should take care of locking. This function will return 0 on
  39  * success or -EINVAL if wrong Test Selector is passed.
  40  */
  41 int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
  42 {
  43         u32             reg;
  44
  45         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
  46         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
  47
  48         switch (mode) {
  49         case TEST_J:
  50         case TEST_K:
  51         case TEST_SE0_NAK:
  52         case TEST_PACKET:
  53         case TEST_FORCE_EN:
  54                 reg |= mode << 1;
  55                 break;
  56         default:
  57                 return -EINVAL;
  58         }
  59
  60         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
  61
  62         return 0;
  63 }
  64
  65 /**
  66  * dwc3_gadget_get_link_state - gets current state of usb link
  67  * @dwc: pointer to our context structure
  68  *
  69  * Caller should take care of locking. This function will
  70  * return the link state on success (>= 0) or -ETIMEDOUT.
  71  */
  72 int dwc3_gadget_get_link_state(struct dwc3 *dwc)
  73 {
  74         u32             reg;
  75
  76         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
  77
  78         return DWC3_DSTS_USBLNKST(reg);
  79 }
  80
  81 /**
  82  * dwc3_gadget_set_link_state - sets usb link to a particular state
  83  * @dwc: pointer to our context structure
  84  * @state: the state to put link into
  85  *
  86  * Caller should take care of locking. This function will
  87  * return 0 on success or -ETIMEDOUT.
  88  */
  89 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
  90 {
  91         int             retries = 10000;
  92         u32             reg;
  93
  94         /*
  95          * Wait until device controller is ready. Only applies to 1.94a and
  96          * later RTL.
  97          */
  98         if (dwc->revision >= DWC3_REVISION_194A) {
  99                 while (--retries) {
 100                         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 101                         if (reg & DWC3_DSTS_DCNRD)
 102                                 udelay(5);
 103                         else
 104                                 break;
 105                 }
 106
 107                 if (retries <= 0)
 108                         return -ETIMEDOUT;
 109         }
 110
 111         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 112         reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
 113
 114         /* set requested state */
 115         reg |= DWC3_DCTL_ULSTCHNGREQ(state);
 116         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 117
 118         /*
 119          * The following code is racy when called from dwc3_gadget_wakeup,
 120          * and is not needed, at least on newer versions
 121          */
 122         if (dwc->revision >= DWC3_REVISION_194A)
 123                 return 0;
 124
 125         /* wait for a change in DSTS */
 126         retries = 10000;
 127         while (--retries) {
 128                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 129
 130                 if (DWC3_DSTS_USBLNKST(reg) == state)
 131                         return 0;
 132
 133                 udelay(5);
 134         }
 135
 136         return -ETIMEDOUT;
 137 }
 138
 139 /**
 140  * dwc3_ep_inc_trb - increment a trb index.
 141  * @index: Pointer to the TRB index to increment.
 142  *
 143  * The index should never point to the link TRB. After incrementing,
 144  * if it is point to the link TRB, wrap around to the beginning. The
 145  * link TRB is always at the last TRB entry.
 146  */
 147 static void dwc3_ep_inc_trb(u8 *index)
 148 {
 149         (*index)++;
 150         if (*index == (DWC3_TRB_NUM - 1))
 151                 *index = 0;
 152 }
 153
 154 /**
 155  * dwc3_ep_inc_enq - increment endpoint's enqueue pointer
 156  * @dep: The endpoint whose enqueue pointer we're incrementing
 157  */
 158 static void dwc3_ep_inc_enq(struct dwc3_ep *dep)
 159 {
 160         dwc3_ep_inc_trb(&dep->trb_enqueue);
 161 }
 162
 163 /**
 164  * dwc3_ep_inc_deq - increment endpoint's dequeue pointer
 165  * @dep: The endpoint whose enqueue pointer we're incrementing
 166  */
 167 static void dwc3_ep_inc_deq(struct dwc3_ep *dep)
 168 {
 169         dwc3_ep_inc_trb(&dep->trb_dequeue);
 170 }
 171
 172 static void dwc3_gadget_del_and_unmap_request(struct dwc3_ep *dep,
 173                 struct dwc3_request *req, int status)
 174 {
 175         struct dwc3                     *dwc = dep->dwc;
 176
 177         list_del(&req->list);
 178         req->remaining = 0;
 179         req->needs_extra_trb = false;
 180
 181         if (req->request.status == -EINPROGRESS)
 182                 req->request.status = status;
 183
 184         if (req->trb)
 185                 usb_gadget_unmap_request_by_dev(dwc->sysdev,
 186                                 &req->request, req->direction);
 187
 188         req->trb = NULL;
 189         trace_dwc3_gadget_giveback(req);
 190
 191         if (dep->number > 1)
 192                 pm_runtime_put(dwc->dev);
 193 }
 194
 195 /**
 196  * dwc3_gadget_giveback - call struct usb_request's ->complete callback
 197  * @dep: The endpoint to whom the request belongs to
 198  * @req: The request we're giving back
 199  * @status: completion code for the request
 200  *
 201  * Must be called with controller's lock held and interrupts disabled. This
 202  * function will unmap @req and call its ->complete() callback to notify upper
 203  * layers that it has completed.
 204  */
 205 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 206                 int status)
 207 {
 208         struct dwc3                     *dwc = dep->dwc;
 209
 210         dwc3_gadget_del_and_unmap_request(dep, req, status);
 211         req->status = DWC3_REQUEST_STATUS_COMPLETED;
 212
 213         spin_unlock(&dwc->lock);
 214         usb_gadget_giveback_request(&dep->endpoint, &req->request);
 215         spin_lock(&dwc->lock);
 216 }
 217
 218 /**
 219  * dwc3_send_gadget_generic_command - issue a generic command for the controller
 220  * @dwc: pointer to the controller context
 221  * @cmd: the command to be issued
 222  * @param: command parameter
 223  *
 224  * Caller should take care of locking. Issue @cmd with a given @param to @dwc
 225  * and wait for its completion.
 226  */
 227 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
 228 {
 229         u32             timeout = 500;
 230         int             status = 0;
 231         int             ret = 0;
 232         u32             reg;
 233
 234         dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
 235         dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
 236
 237         do {
 238                 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
 239                 if (!(reg & DWC3_DGCMD_CMDACT)) {
 240                         status = DWC3_DGCMD_STATUS(reg);
 241                         if (status)
 242                                 ret = -EINVAL;
 243                         break;
 244                 }
 245         } while (--timeout);
 246
 247         if (!timeout) {
 248                 ret = -ETIMEDOUT;
 249                 status = -ETIMEDOUT;
 250         }
 251
 252         trace_dwc3_gadget_generic_cmd(cmd, param, status);
 253
 254         return ret;
 255 }
 256
 257 static int __dwc3_gadget_wakeup(struct dwc3 *dwc);
 258
 259 /**
 260  * dwc3_send_gadget_ep_cmd - issue an endpoint command
 261  * @dep: the endpoint to which the command is going to be issued
 262  * @cmd: the command to be issued
 263  * @params: parameters to the command
 264  *
 265  * Caller should handle locking. This function will issue @cmd with given
 266  * @params to @dep and wait for its completion.
 267  */
 268 int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
 269                 struct dwc3_gadget_ep_cmd_params *params)
 270 {
 271         const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
 272         struct dwc3             *dwc = dep->dwc;
 273         u32                     timeout = 1000;
 274         u32                     saved_config = 0;
 275         u32                     reg;
 276
 277         int                     cmd_status = 0;
 278         int                     ret = -EINVAL;
 279
 280         /*
 281          * When operating in USB 2.0 speeds (HS/FS), if GUSB2PHYCFG.ENBLSLPM or
 282          * GUSB2PHYCFG.SUSPHY is set, it must be cleared before issuing an
 283          * endpoint command.
 284          *
 285          * Save and clear both GUSB2PHYCFG.ENBLSLPM and GUSB2PHYCFG.SUSPHY
 286          * settings. Restore them after the command is completed.
 287          *
 288          * DWC_usb3 3.30a and DWC_usb31 1.90a programming guide section 3.2.2
 289          */
 290         if (dwc->gadget.speed <= USB_SPEED_HIGH) {
 291                 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
 292                 if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {
 293                         saved_config |= DWC3_GUSB2PHYCFG_SUSPHY;
 294                         reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
 295                 }
 296
 297                 if (reg & DWC3_GUSB2PHYCFG_ENBLSLPM) {
 298                         saved_config |= DWC3_GUSB2PHYCFG_ENBLSLPM;
 299                         reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
 300                 }
 301
 302                 if (saved_config)
 303                         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 304         }
 305
 306         if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
 307                 int             needs_wakeup;
 308
 309                 needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 ||
 310                                 dwc->link_state == DWC3_LINK_STATE_U2 ||
 311                                 dwc->link_state == DWC3_LINK_STATE_U3);
 312
 313                 if (unlikely(needs_wakeup)) {
 314                         ret = __dwc3_gadget_wakeup(dwc);
 315                         dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n",
 316                                         ret);
 317                 }
 318         }
 319
 320         dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
 321         dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
 322         dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
 323
 324         /*
 325          * Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're
 326          * not relying on XferNotReady, we can make use of a special "No
 327          * Response Update Transfer" command where we should clear both CmdAct
 328          * and CmdIOC bits.
 329          *
 330          * With this, we don't need to wait for command completion and can
 331          * straight away issue further commands to the endpoint.
 332          *
 333          * NOTICE: We're making an assumption that control endpoints will never
 334          * make use of Update Transfer command. This is a safe assumption
 335          * because we can never have more than one request at a time with
 336          * Control Endpoints. If anybody changes that assumption, this chunk
 337          * needs to be updated accordingly.
 338          */
 339         if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_UPDATETRANSFER &&
 340                         !usb_endpoint_xfer_isoc(desc))
 341                 cmd &= ~(DWC3_DEPCMD_CMDIOC | DWC3_DEPCMD_CMDACT);
 342         else
 343                 cmd |= DWC3_DEPCMD_CMDACT;
 344
 345         dwc3_writel(dep->regs, DWC3_DEPCMD, cmd);
 346         do {
 347                 reg = dwc3_readl(dep->regs, DWC3_DEPCMD);
 348                 if (!(reg & DWC3_DEPCMD_CMDACT)) {
 349                         cmd_status = DWC3_DEPCMD_STATUS(reg);
 350
 351                         switch (cmd_status) {
 352                         case 0:
 353                                 ret = 0;
 354                                 break;
 355                         case DEPEVT_TRANSFER_NO_RESOURCE:
 356                                 ret = -EINVAL;
 357                                 break;
 358                         case DEPEVT_TRANSFER_BUS_EXPIRY:
 359                                 /*
 360                                  * SW issues START TRANSFER command to
 361                                  * isochronous ep with future frame interval. If
 362                                  * future interval time has already passed when
 363                                  * core receives the command, it will respond
 364                                  * with an error status of 'Bus Expiry'.
 365                                  *
 366                                  * Instead of always returning -EINVAL, let's
 367                                  * give a hint to the gadget driver that this is
 368                                  * the case by returning -EAGAIN.
 369                                  */
 370                                 ret = -EAGAIN;
 371                                 break;
 372                         default:
 373                                 dev_WARN(dwc->dev, "UNKNOWN cmd status\n");
 374                         }
 375
 376                         break;
 377                 }
 378         } while (--timeout);
 379
 380         if (timeout == 0) {
 381                 ret = -ETIMEDOUT;
 382                 cmd_status = -ETIMEDOUT;
 383         }
 384
 385         trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status);
 386
 387         if (ret == 0 && DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
 388                 dep->flags |= DWC3_EP_TRANSFER_STARTED;
 389                 dwc3_gadget_ep_get_transfer_index(dep);
 390         }
 391
 392         if (saved_config) {
 393                 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
 394                 reg |= saved_config;
 395                 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 396         }
 397
 398         return ret;
 399 }
 400
 401 static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
 402 {
 403         struct dwc3 *dwc = dep->dwc;
 404         struct dwc3_gadget_ep_cmd_params params;
 405         u32 cmd = DWC3_DEPCMD_CLEARSTALL;
 406
 407         /*
 408          * As of core revision 2.60a the recommended programming model
 409          * is to set the ClearPendIN bit when issuing a Clear Stall EP
 410          * command for IN endpoints. This is to prevent an issue where
 411          * some (non-compliant) hosts may not send ACK TPs for pending
 412          * IN transfers due to a mishandled error condition. Synopsys
 413          * STAR 9000614252.
 414          */
 415         if (dep->direction && (dwc->revision >= DWC3_REVISION_260A) &&
 416             (dwc->gadget.speed >= USB_SPEED_SUPER))
 417                 cmd |= DWC3_DEPCMD_CLEARPENDIN;
 418
 419         memset(&params, 0, sizeof(params));
 420
 421         return dwc3_send_gadget_ep_cmd(dep, cmd, &params);
 422 }
 423
 424 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
 425                 struct dwc3_trb *trb)
 426 {
 427         u32             offset = (char *) trb - (char *) dep->trb_pool;
 428
 429         return dep->trb_pool_dma + offset;
 430 }
 431
 432 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
 433 {
 434         struct dwc3             *dwc = dep->dwc;
 435
 436         if (dep->trb_pool)
 437                 return 0;
 438
 439         dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
 440                         sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 441                         &dep->trb_pool_dma, GFP_KERNEL);
 442         if (!dep->trb_pool) {
 443                 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
 444                                 dep->name);
 445                 return -ENOMEM;
 446         }
 447
 448         return 0;
 449 }
 450
 451 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
 452 {
 453         struct dwc3             *dwc = dep->dwc;
 454
 455         dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 456                         dep->trb_pool, dep->trb_pool_dma);
 457
 458         dep->trb_pool = NULL;
 459         dep->trb_pool_dma = 0;
 460 }
 461
 462 static int dwc3_gadget_set_xfer_resource(struct dwc3_ep *dep)
 463 {
 464         struct dwc3_gadget_ep_cmd_params params;
 465
 466         memset(&params, 0x00, sizeof(params));
 467
 468         params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
 469
 470         return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE,
 471                         &params);
 472 }
 473
 474 /**
 475  * dwc3_gadget_start_config - configure ep resources
 476  * @dep: endpoint that is being enabled
 477  *
 478  * Issue a %DWC3_DEPCMD_DEPSTARTCFG command to @dep. After the command's
 479  * completion, it will set Transfer Resource for all available endpoints.
 480  *
 481  * The assignment of transfer resources cannot perfectly follow the data book
 482  * due to the fact that the controller driver does not have all knowledge of the
 483  * configuration in advance. It is given this information piecemeal by the
 484  * composite gadget framework after every SET_CONFIGURATION and
 485  * SET_INTERFACE. Trying to follow the databook programming model in this
 486  * scenario can cause errors. For two reasons:
 487  *
 488  * 1) The databook says to do %DWC3_DEPCMD_DEPSTARTCFG for every
 489  * %USB_REQ_SET_CONFIGURATION and %USB_REQ_SET_INTERFACE (8.1.5). This is
 490  * incorrect in the scenario of multiple interfaces.
 491  *
 492  * 2) The databook does not mention doing more %DWC3_DEPCMD_DEPXFERCFG for new
 493  * endpoint on alt setting (8.1.6).
 494  *
 495  * The following simplified method is used instead:
 496  *
 497  * All hardware endpoints can be assigned a transfer resource and this setting
 498  * will stay persistent until either a core reset or hibernation. So whenever we
 499  * do a %DWC3_DEPCMD_DEPSTARTCFG(0) we can go ahead and do
 500  * %DWC3_DEPCMD_DEPXFERCFG for every hardware endpoint as well. We are
 501  * guaranteed that there are as many transfer resources as endpoints.
 502  *
 503  * This function is called for each endpoint when it is being enabled but is
 504  * triggered only when called for EP0-out, which always happens first, and which
 505  * should only happen in one of the above conditions.
 506  */
 507 static int dwc3_gadget_start_config(struct dwc3_ep *dep)
 508 {
 509         struct dwc3_gadget_ep_cmd_params params;
 510         struct dwc3             *dwc;
 511         u32                     cmd;
 512         int                     i;
 513         int                     ret;
 514
 515         if (dep->number)
 516                 return 0;
 517
 518         memset(&params, 0x00, sizeof(params));
 519         cmd = DWC3_DEPCMD_DEPSTARTCFG;
 520         dwc = dep->dwc;
 521
 522         ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
 523         if (ret)
 524                 return ret;
 525
 526         for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
 527                 struct dwc3_ep *dep = dwc->eps[i];
 528
 529                 if (!dep)
 530                         continue;
 531
 532                 ret = dwc3_gadget_set_xfer_resource(dep);
 533                 if (ret)
 534                         return ret;
 535         }
 536
 537         return 0;
 538 }
 539
 540 static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action)
 541 {
 542         const struct usb_ss_ep_comp_descriptor *comp_desc;
 543         const struct usb_endpoint_descriptor *desc;
 544         struct dwc3_gadget_ep_cmd_params params;
 545         struct dwc3 *dwc = dep->dwc;
 546
 547         comp_desc = dep->endpoint.comp_desc;
 548         desc = dep->endpoint.desc;
 549
 550         memset(&params, 0x00, sizeof(params));
 551
 552         params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
 553                 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
 554
 555         /* Burst size is only needed in SuperSpeed mode */
 556         if (dwc->gadget.speed >= USB_SPEED_SUPER) {
 557                 u32 burst = dep->endpoint.maxburst;
 558                 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1);
 559         }
 560
 561         params.param0 |= action;
 562         if (action == DWC3_DEPCFG_ACTION_RESTORE)
 563                 params.param2 |= dep->saved_state;
 564
 565         if (usb_endpoint_xfer_control(desc))
 566                 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN;
 567
 568         if (dep->number <= 1 || usb_endpoint_xfer_isoc(desc))
 569                 params.param1 |= DWC3_DEPCFG_XFER_NOT_READY_EN;
 570
 571         if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
 572                 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
 573                         | DWC3_DEPCFG_STREAM_EVENT_EN;
 574                 dep->stream_capable = true;
 575         }
 576
 577         if (!usb_endpoint_xfer_control(desc))
 578                 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
 579
 580         /*
 581          * We are doing 1:1 mapping for endpoints, meaning
 582          * Physical Endpoints 2 maps to Logical Endpoint 2 and
 583          * so on. We consider the direction bit as part of the physical
 584          * endpoint number. So USB endpoint 0x81 is 0x03.
 585          */
 586         params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
 587
 588         /*
 589          * We must use the lower 16 TX FIFOs even though
 590          * HW might have more
 591          */
 592         if (dep->direction)
 593                 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
 594
 595         if (desc->bInterval) {
 596                 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
 597                 dep->interval = 1 << (desc->bInterval - 1);
 598         }
 599
 600         return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, &params);
 601 }
 602
 603 /**
 604  * __dwc3_gadget_ep_enable - initializes a hw endpoint
 605  * @dep: endpoint to be initialized
 606  * @action: one of INIT, MODIFY or RESTORE
 607  *
 608  * Caller should take care of locking. Execute all necessary commands to
 609  * initialize a HW endpoint so it can be used by a gadget driver.
 610  */
 611 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
 612 {
 613         const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
 614         struct dwc3             *dwc = dep->dwc;
 615
 616         u32                     reg;
 617         int                     ret;
 618
 619         if (!(dep->flags & DWC3_EP_ENABLED)) {
 620                 ret = dwc3_gadget_start_config(dep);
 621                 if (ret)
 622                         return ret;
 623         }
 624
 625         ret = dwc3_gadget_set_ep_config(dep, action);
 626         if (ret)
 627                 return ret;
 628
 629         if (!(dep->flags & DWC3_EP_ENABLED)) {
 630                 struct dwc3_trb *trb_st_hw;
 631                 struct dwc3_trb *trb_link;
 632
 633                 dep->type = usb_endpoint_type(desc);
 634                 dep->flags |= DWC3_EP_ENABLED;
 635
 636                 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 637                 reg |= DWC3_DALEPENA_EP(dep->number);
 638                 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 639
 640                 if (usb_endpoint_xfer_control(desc))
 641                         goto out;
 642
 643                 /* Initialize the TRB ring */
 644                 dep->trb_dequeue = 0;
 645                 dep->trb_enqueue = 0;
 646                 memset(dep->trb_pool, 0,
 647                        sizeof(struct dwc3_trb) * DWC3_TRB_NUM);
 648
 649                 /* Link TRB. The HWO bit is never reset */
 650                 trb_st_hw = &dep->trb_pool[0];
 651
 652                 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
 653                 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 654                 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
 655                 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
 656                 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
 657         }
 658
 659         /*
 660          * Issue StartTransfer here with no-op TRB so we can always rely on No
 661          * Response Update Transfer command.
 662          */
 663         if ((usb_endpoint_xfer_bulk(desc) && !dep->stream_capable) ||
 664                         usb_endpoint_xfer_int(desc)) {
 665                 struct dwc3_gadget_ep_cmd_params params;
 666                 struct dwc3_trb *trb;
 667                 dma_addr_t trb_dma;
 668                 u32 cmd;
 669
 670                 memset(&params, 0, sizeof(params));
 671                 trb = &dep->trb_pool[0];
 672                 trb_dma = dwc3_trb_dma_offset(dep, trb);
 673
 674                 params.param0 = upper_32_bits(trb_dma);
 675                 params.param1 = lower_32_bits(trb_dma);
 676
 677                 cmd = DWC3_DEPCMD_STARTTRANSFER;
 678
 679                 ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
 680                 if (ret < 0)
 681                         return ret;
 682         }
 683
 684 out:
 685         trace_dwc3_gadget_ep_enable(dep);
 686
 687         return 0;
 688 }
 689
 690 static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
 691                 bool interrupt);
 692 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 693 {
 694         struct dwc3_request             *req;
 695
 696         dwc3_stop_active_transfer(dep, true, false);
 697
 698         /* - giveback all requests to gadget driver */
 699         while (!list_empty(&dep->started_list)) {
 700                 req = next_request(&dep->started_list);
 701
 702                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 703         }
 704
 705         while (!list_empty(&dep->pending_list)) {
 706                 req = next_request(&dep->pending_list);
 707
 708                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 709         }
 710
 711         while (!list_empty(&dep->cancelled_list)) {
 712                 req = next_request(&dep->cancelled_list);
 713
 714                 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 715         }
 716 }
 717
 718 /**
 719  * __dwc3_gadget_ep_disable - disables a hw endpoint
 720  * @dep: the endpoint to disable
 721  *
 722  * This function undoes what __dwc3_gadget_ep_enable did and also removes
 723  * requests which are currently being processed by the hardware and those which
 724  * are not yet scheduled.
 725  *
 726  * Caller should take care of locking.
 727  */
 728 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
 729 {
 730         struct dwc3             *dwc = dep->dwc;
 731         u32                     reg;
 732
 733         trace_dwc3_gadget_ep_disable(dep);
 734
 735         dwc3_remove_requests(dwc, dep);
 736
 737         /* make sure HW endpoint isn't stalled */
 738         if (dep->flags & DWC3_EP_STALL)
 739                 __dwc3_gadget_ep_set_halt(dep, 0, false);
 740
 741         reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 742         reg &= ~DWC3_DALEPENA_EP(dep->number);
 743         dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
 744
 745         dep->stream_capable = false;
 746         dep->type = 0;
 747         dep->flags = 0;
 748
 749         /* Clear out the ep descriptors for non-ep0 */
 750         if (dep->number > 1) {
 751                 dep->endpoint.comp_desc = NULL;
 752                 dep->endpoint.desc = NULL;
 753         }
 754
 755         return 0;
 756 }
 757
 758 /* -------------------------------------------------------------------------- */
 759
 760 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
 761                 const struct usb_endpoint_descriptor *desc)
 762 {
 763         return -EINVAL;
 764 }
 765
 766 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
 767 {
 768         return -EINVAL;
 769 }
 770
 771 /* -------------------------------------------------------------------------- */
 772
 773 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
 774                 const struct usb_endpoint_descriptor *desc)
 775 {
 776         struct dwc3_ep                  *dep;
 777         struct dwc3                     *dwc;
 778         unsigned long                   flags;
 779         int                             ret;
 780
 781         if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
 782                 pr_debug("dwc3: invalid parameters\n");
 783                 return -EINVAL;
 784         }
 785
 786         if (!desc->wMaxPacketSize) {
 787                 pr_debug("dwc3: missing wMaxPacketSize\n");
 788                 return -EINVAL;
 789         }
 790
 791         dep = to_dwc3_ep(ep);
 792         dwc = dep->dwc;
 793
 794         if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
 795                                         "%s is already enabled\n",
 796                                         dep->name))
 797                 return 0;
 798
 799         spin_lock_irqsave(&dwc->lock, flags);
 800         ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
 801         spin_unlock_irqrestore(&dwc->lock, flags);
 802
 803         return ret;
 804 }
 805
 806 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
 807 {
 808         struct dwc3_ep                  *dep;
 809         struct dwc3                     *dwc;
 810         unsigned long                   flags;
 811         int                             ret;
 812
 813         if (!ep) {
 814                 pr_debug("dwc3: invalid parameters\n");
 815                 return -EINVAL;
 816         }
 817
 818         dep = to_dwc3_ep(ep);
 819         dwc = dep->dwc;
 820
 821         if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
 822                                         "%s is already disabled\n",
 823                                         dep->name))
 824                 return 0;
 825
 826         spin_lock_irqsave(&dwc->lock, flags);
 827         ret = __dwc3_gadget_ep_disable(dep);
 828         spin_unlock_irqrestore(&dwc->lock, flags);
 829
 830         return ret;
 831 }
 832
 833 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
 834                 gfp_t gfp_flags)
 835 {
 836         struct dwc3_request             *req;
 837         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 838
 839         req = kzalloc(sizeof(*req), gfp_flags);
 840         if (!req)
 841                 return NULL;
 842
 843         req->direction  = dep->direction;
 844         req->epnum      = dep->number;
 845         req->dep        = dep;
 846         req->status     = DWC3_REQUEST_STATUS_UNKNOWN;
 847
 848         trace_dwc3_alloc_request(req);
 849
 850         return &req->request;
 851 }
 852
 853 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
 854                 struct usb_request *request)
 855 {
 856         struct dwc3_request             *req = to_dwc3_request(request);
 857
 858         trace_dwc3_free_request(req);
 859         kfree(req);
 860 }
 861
 862 /**
 863  * dwc3_ep_prev_trb - returns the previous TRB in the ring
 864  * @dep: The endpoint with the TRB ring
 865  * @index: The index of the current TRB in the ring
 866  *
 867  * Returns the TRB prior to the one pointed to by the index. If the
 868  * index is 0, we will wrap backwards, skip the link TRB, and return
 869  * the one just before that.
 870  */
 871 static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
 872 {
 873         u8 tmp = index;
 874
 875         if (!tmp)
 876                 tmp = DWC3_TRB_NUM - 1;
 877
 878         return &dep->trb_pool[tmp - 1];
 879 }
 880
 881 static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
 882 {
 883         struct dwc3_trb         *tmp;
 884         u8                      trbs_left;
 885
 886         /*
 887          * If enqueue & dequeue are equal than it is either full or empty.
 888          *
 889          * One way to know for sure is if the TRB right before us has HWO bit
 890          * set or not. If it has, then we're definitely full and can't fit any
 891          * more transfers in our ring.
 892          */
 893         if (dep->trb_enqueue == dep->trb_dequeue) {
 894                 tmp = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
 895                 if (tmp->ctrl & DWC3_TRB_CTRL_HWO)
 896                         return 0;
 897
 898                 return DWC3_TRB_NUM - 1;
 899         }
 900
 901         trbs_left = dep->trb_dequeue - dep->trb_enqueue;
 902         trbs_left &= (DWC3_TRB_NUM - 1);
 903
 904         if (dep->trb_dequeue < dep->trb_enqueue)
 905                 trbs_left--;
 906
 907         return trbs_left;
 908 }
 909
 910 static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_trb *trb,
 911                 dma_addr_t dma, unsigned length, unsigned chain, unsigned node,
 912                 unsigned stream_id, unsigned short_not_ok, unsigned no_interrupt)
 913 {
 914         struct dwc3             *dwc = dep->dwc;
 915         struct usb_gadget       *gadget = &dwc->gadget;
 916         enum usb_device_speed   speed = gadget->speed;
 917
 918         trb->size = DWC3_TRB_SIZE_LENGTH(length);
 919         trb->bpl = lower_32_bits(dma);
 920         trb->bph = upper_32_bits(dma);
 921
 922         switch (usb_endpoint_type(dep->endpoint.desc)) {
 923         case USB_ENDPOINT_XFER_CONTROL:
 924                 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
 925                 break;
 926
 927         case USB_ENDPOINT_XFER_ISOC:
 928                 if (!node) {
 929                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
 930
 931                         /*
 932                          * USB Specification 2.0 Section 5.9.2 states that: "If
 933                          * there is only a single transaction in the microframe,
 934                          * only a DATA0 data packet PID is used.  If there are
 935                          * two transactions per microframe, DATA1 is used for
 936                          * the first transaction data packet and DATA0 is used
 937                          * for the second transaction data packet.  If there are
 938                          * three transactions per microframe, DATA2 is used for
 939                          * the first transaction data packet, DATA1 is used for
 940                          * the second, and DATA0 is used for the third."
 941                          *
 942                          * IOW, we should satisfy the following cases:
 943                          *
 944                          * 1) length <= maxpacket
 945                          *      - DATA0
 946                          *
 947                          * 2) maxpacket < length <= (2 * maxpacket)
 948                          *      - DATA1, DATA0
 949                          *
 950                          * 3) (2 * maxpacket) < length <= (3 * maxpacket)
 951                          *      - DATA2, DATA1, DATA0
 952                          */
 953                         if (speed == USB_SPEED_HIGH) {
 954                                 struct usb_ep *ep = &dep->endpoint;
 955                                 unsigned int mult = 2;
 956                                 unsigned int maxp = usb_endpoint_maxp(ep->desc);
 957
 958                                 if (length <= (2 * maxp))
 959                                         mult--;
 960
 961                                 if (length <= maxp)
 962                                         mult--;
 963
 964                                 trb->size |= DWC3_TRB_SIZE_PCM1(mult);
 965                         }
 966                 } else {
 967                         trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
 968                 }
 969
 970                 /* always enable Interrupt on Missed ISOC */
 971                 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
 972                 break;
 973
 974         case USB_ENDPOINT_XFER_BULK:
 975         case USB_ENDPOINT_XFER_INT:
 976                 trb->ctrl = DWC3_TRBCTL_NORMAL;
 977                 break;
 978         default:
 979                 /*
 980                  * This is only possible with faulty memory because we
 981                  * checked it already :)
 982                  */
 983                 dev_WARN(dwc->dev, "Unknown endpoint type %d\n",
 984                                 usb_endpoint_type(dep->endpoint.desc));
 985         }
 986
 987         /*
 988          * Enable Continue on Short Packet
 989          * when endpoint is not a stream capable
 990          */
 991         if (usb_endpoint_dir_out(dep->endpoint.desc)) {
 992                 if (!dep->stream_capable)
 993                         trb->ctrl |= DWC3_TRB_CTRL_CSP;
 994
 995                 if (short_not_ok)
 996                         trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
 997         }
 998
 999         if ((!no_interrupt && !chain) ||
1000                         (dwc3_calc_trbs_left(dep) == 1))
1001                 trb->ctrl |= DWC3_TRB_CTRL_IOC;
1002
1003         if (chain)
1004                 trb->ctrl |= DWC3_TRB_CTRL_CHN;
1005
1006         if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
1007                 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(stream_id);
1008
1009         trb->ctrl |= DWC3_TRB_CTRL_HWO;
1010
1011         dwc3_ep_inc_enq(dep);
1012
1013         trace_dwc3_prepare_trb(dep, trb);
1014 }
1015
1016 /**
1017  * dwc3_prepare_one_trb - setup one TRB from one request
1018  * @dep: endpoint for which this request is prepared
1019  * @req: dwc3_request pointer
1020  * @chain: should this TRB be chained to the next?
1021  * @node: only for isochronous endpoints. First TRB needs different type.
1022  */
1023 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
1024                 struct dwc3_request *req, unsigned chain, unsigned node)
1025 {
1026         struct dwc3_trb         *trb;
1027         unsigned int            length;
1028         dma_addr_t              dma;
1029         unsigned                stream_id = req->request.stream_id;
1030         unsigned                short_not_ok = req->request.short_not_ok;
1031         unsigned                no_interrupt = req->request.no_interrupt;
1032
1033         if (req->request.num_sgs > 0) {
1034                 length = sg_dma_len(req->start_sg);
1035                 dma = sg_dma_address(req->start_sg);
1036         } else {
1037                 length = req->request.length;
1038                 dma = req->request.dma;
1039         }
1040
1041         trb = &dep->trb_pool[dep->trb_enqueue];
1042
1043         if (!req->trb) {
1044                 dwc3_gadget_move_started_request(req);
1045                 req->trb = trb;
1046                 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
1047         }
1048
1049         req->num_trbs++;
1050
1051         __dwc3_prepare_one_trb(dep, trb, dma, length, chain, node,
1052                         stream_id, short_not_ok, no_interrupt);
1053 }
1054
1055 static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
1056                 struct dwc3_request *req)
1057 {
1058         struct scatterlist *sg = req->start_sg;
1059         struct scatterlist *s;
1060         int             i;
1061
1062         unsigned int remaining = req->request.num_mapped_sgs
1063                 - req->num_queued_sgs;
1064
1065         for_each_sg(sg, s, remaining, i) {
1066                 unsigned int length = req->request.length;
1067                 unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
1068                 unsigned int rem = length % maxp;
1069                 unsigned chain = true;
1070
1071                 if (sg_is_last(s))
1072                         chain = false;
1073
1074                 if (rem && usb_endpoint_dir_out(dep->endpoint.desc) && !chain) {
1075                         struct dwc3     *dwc = dep->dwc;
1076                         struct dwc3_trb *trb;
1077
1078                         req->needs_extra_trb = true;
1079
1080                         /* prepare normal TRB */
1081                         dwc3_prepare_one_trb(dep, req, true, i);
1082
1083                         /* Now prepare one extra TRB to align transfer size */
1084                         trb = &dep->trb_pool[dep->trb_enqueue];
1085                         req->num_trbs++;
1086                         __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr,
1087                                         maxp - rem, false, 1,
1088                                         req->request.stream_id,
1089                                         req->request.short_not_ok,
1090                                         req->request.no_interrupt);
1091                 } else {
1092                         dwc3_prepare_one_trb(dep, req, chain, i);
1093                 }
1094
1095                 /*
1096                  * There can be a situation where all sgs in sglist are not
1097                  * queued because of insufficient trb number. To handle this
1098                  * case, update start_sg to next sg to be queued, so that
1099                  * we have free trbs we can continue queuing from where we
1100                  * previously stopped
1101                  */
1102                 if (chain)
1103                         req->start_sg = sg_next(s);
1104
1105                 req->num_queued_sgs++;
1106
1107                 if (!dwc3_calc_trbs_left(dep))
1108                         break;
1109         }
1110 }
1111
1112 static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
1113                 struct dwc3_request *req)
1114 {
1115         unsigned int length = req->request.length;
1116         unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
1117         unsigned int rem = length % maxp;
1118
1119         if ((!length || rem) && usb_endpoint_dir_out(dep->endpoint.desc)) {
1120                 struct dwc3     *dwc = dep->dwc;
1121                 struct dwc3_trb *trb;
1122
1123                 req->needs_extra_trb = true;
1124
1125                 /* prepare normal TRB */
1126                 dwc3_prepare_one_trb(dep, req, true, 0);
1127
1128                 /* Now prepare one extra TRB to align transfer size */
1129                 trb = &dep->trb_pool[dep->trb_enqueue];
1130                 req->num_trbs++;
1131                 __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp - rem,
1132                                 false, 1, req->request.stream_id,
1133                                 req->request.short_not_ok,
1134                                 req->request.no_interrupt);
1135         } else if (req->request.zero && req->request.length &&
1136                    (IS_ALIGNED(req->request.length, maxp))) {
1137                 struct dwc3     *dwc = dep->dwc;
1138                 struct dwc3_trb *trb;
1139
1140                 req->needs_extra_trb = true;
1141
1142                 /* prepare normal TRB */
1143                 dwc3_prepare_one_trb(dep, req, true, 0);
1144
1145                 /* Now prepare one extra TRB to handle ZLP */
1146                 trb = &dep->trb_pool[dep->trb_enqueue];
1147                 req->num_trbs++;
1148                 __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, 0,
1149                                 false, 1, req->request.stream_id,
1150                                 req->request.short_not_ok,
1151                                 req->request.no_interrupt);
1152         } else {
1153                 dwc3_prepare_one_trb(dep, req, false, 0);
1154         }
1155 }
1156
1157 /*
1158  * dwc3_prepare_trbs - setup TRBs from requests
1159  * @dep: endpoint for which requests are being prepared
1160  *
1161  * The function goes through the requests list and sets up TRBs for the
1162  * transfers. The function returns once there are no more TRBs available or
1163  * it runs out of requests.
1164  */
1165 static void dwc3_prepare_trbs(struct dwc3_ep *dep)
1166 {
1167         struct dwc3_request     *req, *n;
1168
1169         BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
1170
1171         /*
1172          * We can get in a situation where there's a request in the started list
1173          * but there weren't enough TRBs to fully kick it in the first time
1174          * around, so it has been waiting for more TRBs to be freed up.
1175          *
1176          * In that case, we should check if we have a request with pending_sgs
1177          * in the started list and prepare TRBs for that request first,
1178          * otherwise we will prepare TRBs completely out of order and that will
1179          * break things.
1180          */
1181         list_for_each_entry(req, &dep->started_list, list) {
1182                 if (req->num_pending_sgs > 0)
1183                         dwc3_prepare_one_trb_sg(dep, req);
1184
1185                 if (!dwc3_calc_trbs_left(dep))
1186                         return;
1187         }
1188
1189         list_for_each_entry_safe(req, n, &dep->pending_list, list) {
1190                 struct dwc3     *dwc = dep->dwc;
1191                 int             ret;
1192
1193                 ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
1194                                                     dep->direction);
1195                 if (ret)
1196                         return;
1197
1198                 req->sg                 = req->request.sg;
1199                 req->start_sg           = req->sg;
1200                 req->num_queued_sgs     = 0;
1201                 req->num_pending_sgs    = req->request.num_mapped_sgs;
1202
1203                 if (req->num_pending_sgs > 0)
1204                         dwc3_prepare_one_trb_sg(dep, req);
1205                 else
1206                         dwc3_prepare_one_trb_linear(dep, req);
1207
1208                 if (!dwc3_calc_trbs_left(dep))
1209                         return;
1210         }
1211 }
1212
1213 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
1214 {
1215         struct dwc3_gadget_ep_cmd_params params;
1216         struct dwc3_request             *req;
1217         int                             starting;
1218         int                             ret;
1219         u32                             cmd;
1220
1221         if (!dwc3_calc_trbs_left(dep))
1222                 return 0;
1223
1224         starting = !(dep->flags & DWC3_EP_TRANSFER_STARTED);
1225
1226         dwc3_prepare_trbs(dep);
1227         req = next_request(&dep->started_list);
1228         if (!req) {
1229                 dep->flags |= DWC3_EP_PENDING_REQUEST;
1230                 return 0;
1231         }
1232
1233         memset(&params, 0, sizeof(params));
1234
1235         if (starting) {
1236                 params.param0 = upper_32_bits(req->trb_dma);
1237                 params.param1 = lower_32_bits(req->trb_dma);
1238                 cmd = DWC3_DEPCMD_STARTTRANSFER;
1239
1240                 if (dep->stream_capable)
1241                         cmd |= DWC3_DEPCMD_PARAM(req->request.stream_id);
1242
1243                 if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
1244                         cmd |= DWC3_DEPCMD_PARAM(dep->frame_number);
1245         } else {
1246                 cmd = DWC3_DEPCMD_UPDATETRANSFER |
1247                         DWC3_DEPCMD_PARAM(dep->resource_index);
1248         }
1249
1250         ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
1251         if (ret < 0) {
1252                 /*
1253                  * FIXME we need to iterate over the list of requests
1254                  * here and stop, unmap, free and del each of the linked
1255                  * requests instead of what we do now.
1256                  */
1257                 if (req->trb)
1258                         memset(req->trb, 0, sizeof(struct dwc3_trb));
1259                 dwc3_gadget_del_and_unmap_request(dep, req, ret);
1260                 return ret;
1261         }
1262
1263         return 0;
1264 }
1265
1266 static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
1267 {
1268         u32                     reg;
1269
1270         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1271         return DWC3_DSTS_SOFFN(reg);
1272 }
1273
1274 /**
1275  * dwc3_gadget_start_isoc_quirk - workaround invalid frame number
1276  * @dep: isoc endpoint
1277  *
1278  * This function tests for the correct combination of BIT[15:14] from the 16-bit
1279  * microframe number reported by the XferNotReady event for the future frame
1280  * number to start the isoc transfer.
1281  *
1282  * In DWC_usb31 version 1.70a-ea06 and prior, for highspeed and fullspeed
1283  * isochronous IN, BIT[15:14] of the 16-bit microframe number reported by the
1284  * XferNotReady event are invalid. The driver uses this number to schedule the
1285  * isochronous transfer and passes it to the START TRANSFER command. Because
1286  * this number is invalid, the command may fail. If BIT[15:14] matches the
1287  * internal 16-bit microframe, the START TRANSFER command will pass and the
1288  * transfer will start at the scheduled time, if it is off by 1, the command
1289  * will still pass, but the transfer will start 2 seconds in the future. For all
1290  * other conditions, the START TRANSFER command will fail with bus-expiry.
1291  *
1292  * In order to workaround this issue, we can test for the correct combination of
1293  * BIT[15:14] by sending START TRANSFER commands with different values of
1294  * BIT[15:14]: 'b00, 'b01, 'b10, and 'b11. Each combination is 2^14 uframe apart
1295  * (or 2 seconds). 4 seconds into the future will result in a bus-expiry status.
1296  * As the result, within the 4 possible combinations for BIT[15:14], there will
1297  * be 2 successful and 2 failure START COMMAND status. One of the 2 successful
1298  * command status will result in a 2-second delay start. The smaller BIT[15:14]
1299  * value is the correct combination.
1300  *
1301  * Since there are only 4 outcomes and the results are ordered, we can simply
1302  * test 2 START TRANSFER commands with BIT[15:14] combinations 'b00 and 'b01 to
1303  * deduce the smaller successful combination.
1304  *
1305  * Let test0 = test status for combination 'b00 and test1 = test status for 'b01
1306  * of BIT[15:14]. The correct combination is as follow:
1307  *
1308  * if test0 fails and test1 passes, BIT[15:14] is 'b01
1309  * if test0 fails and test1 fails, BIT[15:14] is 'b10
1310  * if test0 passes and test1 fails, BIT[15:14] is 'b11
1311  * if test0 passes and test1 passes, BIT[15:14] is 'b00
1312  *
1313  * Synopsys STAR 9001202023: Wrong microframe number for isochronous IN
1314  * endpoints.
1315  */
1316 static int dwc3_gadget_start_isoc_quirk(struct dwc3_ep *dep)
1317 {
1318         int cmd_status = 0;
1319         bool test0;
1320         bool test1;
1321
1322         while (dep->combo_num < 2) {
1323                 struct dwc3_gadget_ep_cmd_params params;
1324                 u32 test_frame_number;
1325                 u32 cmd;
1326
1327                 /*
1328                  * Check if we can start isoc transfer on the next interval or
1329                  * 4 uframes in the future with BIT[15:14] as dep->combo_num
1330                  */
1331                 test_frame_number = dep->frame_number & 0x3fff;
1332                 test_frame_number |= dep->combo_num << 14;
1333                 test_frame_number += max_t(u32, 4, dep->interval);
1334
1335                 params.param0 = upper_32_bits(dep->dwc->bounce_addr);
1336                 params.param1 = lower_32_bits(dep->dwc->bounce_addr);
1337
1338                 cmd = DWC3_DEPCMD_STARTTRANSFER;
1339                 cmd |= DWC3_DEPCMD_PARAM(test_frame_number);
1340                 cmd_status = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
1341
1342                 /* Redo if some other failure beside bus-expiry is received */
1343                 if (cmd_status && cmd_status != -EAGAIN) {
1344                         dep->start_cmd_status = 0;
1345                         dep->combo_num = 0;
1346                         return 0;
1347                 }
1348
1349                 /* Store the first test status */
1350                 if (dep->combo_num == 0)
1351                         dep->start_cmd_status = cmd_status;
1352
1353                 dep->combo_num++;
1354
1355                 /*
1356                  * End the transfer if the START_TRANSFER command is successful
1357                  * to wait for the next XferNotReady to test the command again
1358                  */
1359                 if (cmd_status == 0) {
1360                         dwc3_stop_active_transfer(dep, true, true);
1361                         return 0;
1362                 }
1363         }
1364
1365         /* test0 and test1 are both completed at this point */
1366         test0 = (dep->start_cmd_status == 0);
1367         test1 = (cmd_status == 0);
1368
1369         if (!test0 && test1)
1370                 dep->combo_num = 1;
1371         else if (!test0 && !test1)
1372                 dep->combo_num = 2;
1373         else if (test0 && !test1)
1374                 dep->combo_num = 3;
1375         else if (test0 && test1)
1376                 dep->combo_num = 0;
1377
1378         dep->frame_number &= 0x3fff;
1379         dep->frame_number |= dep->combo_num << 14;
1380         dep->frame_number += max_t(u32, 4, dep->interval);
1381
1382         /* Reinitialize test variables */
1383         dep->start_cmd_status = 0;
1384         dep->combo_num = 0;
1385
1386         return __dwc3_gadget_kick_transfer(dep);
1387 }
1388
1389 static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
1390 {
1391         struct dwc3 *dwc = dep->dwc;
1392         int ret;
1393         int i;
1394
1395         if (list_empty(&dep->pending_list)) {
1396                 dep->flags |= DWC3_EP_PENDING_REQUEST;
1397                 return -EAGAIN;
1398         }
1399
1400         if (!dwc->dis_start_transfer_quirk && dwc3_is_usb31(dwc) &&
1401             (dwc->revision <= DWC3_USB31_REVISION_160A ||
1402              (dwc->revision == DWC3_USB31_REVISION_170A &&
1403               dwc->version_type >= DWC31_VERSIONTYPE_EA01 &&
1404               dwc->version_type <= DWC31_VERSIONTYPE_EA06))) {
1405
1406                 if (dwc->gadget.speed <= USB_SPEED_HIGH && dep->direction)
1407                         return dwc3_gadget_start_isoc_quirk(dep);
1408         }
1409
1410         for (i = 0; i < DWC3_ISOC_MAX_RETRIES; i++) {
1411                 dep->frame_number = DWC3_ALIGN_FRAME(dep, i + 1);
1412
1413                 ret = __dwc3_gadget_kick_transfer(dep);
1414                 if (ret != -EAGAIN)
1415                         break;
1416         }
1417
1418         return ret;
1419 }
1420
1421 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1422 {
1423         struct dwc3             *dwc = dep->dwc;
1424
1425         if (!dep->endpoint.desc) {
1426                 dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
1427                                 dep->name);
1428                 return -ESHUTDOWN;
1429         }
1430
1431         if (WARN(req->dep != dep, "request %pK belongs to '%s'\n",
1432                                 &req->request, req->dep->name))
1433                 return -EINVAL;
1434
1435         if (WARN(req->status < DWC3_REQUEST_STATUS_COMPLETED,
1436                                 "%s: request %pK already in flight\n",
1437                                 dep->name, &req->request))
1438                 return -EINVAL;
1439
1440         pm_runtime_get(dwc->dev);
1441
1442         req->request.actual     = 0;
1443         req->request.status     = -EINPROGRESS;
1444
1445         trace_dwc3_ep_queue(req);
1446
1447         list_add_tail(&req->list, &dep->pending_list);
1448         req->status = DWC3_REQUEST_STATUS_QUEUED;
1449
1450         /*
1451          * NOTICE: Isochronous endpoints should NEVER be prestarted. We must
1452          * wait for a XferNotReady event so we will know what's the current
1453          * (micro-)frame number.
1454          *
1455          * Without this trick, we are very, very likely gonna get Bus Expiry
1456          * errors which will force us issue EndTransfer command.
1457          */
1458         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1459                 if (!(dep->flags & DWC3_EP_PENDING_REQUEST) &&
1460                                 !(dep->flags & DWC3_EP_TRANSFER_STARTED))
1461                         return 0;
1462
1463                 if ((dep->flags & DWC3_EP_PENDING_REQUEST)) {
1464                         if (!(dep->flags & DWC3_EP_TRANSFER_STARTED)) {
1465                                 return __dwc3_gadget_start_isoc(dep);
1466                         }
1467                 }
1468         }
1469
1470         return __dwc3_gadget_kick_transfer(dep);
1471 }
1472
1473 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1474         gfp_t gfp_flags)
1475 {
1476         struct dwc3_request             *req = to_dwc3_request(request);
1477         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1478         struct dwc3                     *dwc = dep->dwc;
1479
1480         unsigned long                   flags;
1481
1482         int                             ret;
1483
1484         spin_lock_irqsave(&dwc->lock, flags);
1485         ret = __dwc3_gadget_ep_queue(dep, req);
1486         spin_unlock_irqrestore(&dwc->lock, flags);
1487
1488         return ret;
1489 }
1490
1491 static void dwc3_gadget_ep_skip_trbs(struct dwc3_ep *dep, struct dwc3_request *req)
1492 {
1493         int i;
1494
1495         /*
1496          * If request was already started, this means we had to
1497          * stop the transfer. With that we also need to ignore
1498          * all TRBs used by the request, however TRBs can only
1499          * be modified after completion of END_TRANSFER
1500          * command. So what we do here is that we wait for
1501          * END_TRANSFER completion and only after that, we jump
1502          * over TRBs by clearing HWO and incrementing dequeue
1503          * pointer.
1504          */
1505         for (i = 0; i < req->num_trbs; i++) {
1506                 struct dwc3_trb *trb;
1507
1508                 trb = req->trb + i;
1509                 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
1510                 dwc3_ep_inc_deq(dep);
1511         }
1512
1513         req->num_trbs = 0;
1514 }
1515
1516 static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep)
1517 {
1518         struct dwc3_request             *req;
1519         struct dwc3_request             *tmp;
1520
1521         list_for_each_entry_safe(req, tmp, &dep->cancelled_list, list) {
1522                 dwc3_gadget_ep_skip_trbs(dep, req);
1523                 dwc3_gadget_giveback(dep, req, -ECONNRESET);
1524         }
1525 }
1526
1527 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1528                 struct usb_request *request)
1529 {
1530         struct dwc3_request             *req = to_dwc3_request(request);
1531         struct dwc3_request             *r = NULL;
1532
1533         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1534         struct dwc3                     *dwc = dep->dwc;
1535
1536         unsigned long                   flags;
1537         int                             ret = 0;
1538
1539         trace_dwc3_ep_dequeue(req);
1540
1541         spin_lock_irqsave(&dwc->lock, flags);
1542
1543         list_for_each_entry(r, &dep->pending_list, list) {
1544                 if (r == req)
1545                         break;
1546         }
1547
1548         if (r != req) {
1549                 list_for_each_entry(r, &dep->started_list, list) {
1550                         if (r == req)
1551                                 break;
1552                 }
1553                 if (r == req) {
1554                         /* wait until it is processed */
1555                         dwc3_stop_active_transfer(dep, true, true);
1556
1557                         if (!r->trb)
1558                                 goto out0;
1559
1560                         dwc3_gadget_move_cancelled_request(req);
1561                         if (dep->flags & DWC3_EP_TRANSFER_STARTED)
1562                                 goto out0;
1563                         else
1564                                 goto out1;
1565                 }
1566                 dev_err(dwc->dev, "request %pK was not queued to %s\n",
1567                                 request, ep->name);
1568                 ret = -EINVAL;
1569                 goto out0;
1570         }
1571
1572 out1:
1573         dwc3_gadget_giveback(dep, req, -ECONNRESET);
1574
1575 out0:
1576         spin_unlock_irqrestore(&dwc->lock, flags);
1577
1578         return ret;
1579 }
1580
1581 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
1582 {
1583         struct dwc3_gadget_ep_cmd_params        params;
1584         struct dwc3                             *dwc = dep->dwc;
1585         int                                     ret;
1586
1587         if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1588                 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1589                 return -EINVAL;
1590         }
1591
1592         memset(&params, 0x00, sizeof(params));
1593
1594         if (value) {
1595                 struct dwc3_trb *trb;
1596
1597                 unsigned transfer_in_flight;
1598                 unsigned started;
1599
1600                 if (dep->number > 1)
1601                         trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
1602                 else
1603                         trb = &dwc->ep0_trb[dep->trb_enqueue];
1604
1605                 transfer_in_flight = trb->ctrl & DWC3_TRB_CTRL_HWO;
1606                 started = !list_empty(&dep->started_list);
1607
1608                 if (!protocol && ((dep->direction && transfer_in_flight) ||
1609                                 (!dep->direction && started))) {
1610                         return -EAGAIN;
1611                 }
1612
1613                 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETSTALL,
1614                                 &params);
1615                 if (ret)
1616                         dev_err(dwc->dev, "failed to set STALL on %s\n",
1617                                         dep->name);
1618                 else
1619                         dep->flags |= DWC3_EP_STALL;
1620         } else {
1621
1622                 ret = dwc3_send_clear_stall_ep_cmd(dep);
1623                 if (ret)
1624                         dev_err(dwc->dev, "failed to clear STALL on %s\n",
1625                                         dep->name);
1626                 else
1627                         dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1628         }
1629
1630         return ret;
1631 }
1632
1633 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1634 {
1635         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1636         struct dwc3                     *dwc = dep->dwc;
1637
1638         unsigned long                   flags;
1639
1640         int                             ret;
1641
1642         spin_lock_irqsave(&dwc->lock, flags);
1643         ret = __dwc3_gadget_ep_set_halt(dep, value, false);
1644         spin_unlock_irqrestore(&dwc->lock, flags);
1645
1646         return ret;
1647 }
1648
1649 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1650 {
1651         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
1652         struct dwc3                     *dwc = dep->dwc;
1653         unsigned long                   flags;
1654         int                             ret;
1655
1656         spin_lock_irqsave(&dwc->lock, flags);
1657         dep->flags |= DWC3_EP_WEDGE;
1658
1659         if (dep->number == 0 || dep->number == 1)
1660                 ret = __dwc3_gadget_ep0_set_halt(ep, 1);
1661         else
1662                 ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
1663         spin_unlock_irqrestore(&dwc->lock, flags);
1664
1665         return ret;
1666 }
1667
1668 /* -------------------------------------------------------------------------- */
1669
1670 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1671         .bLength        = USB_DT_ENDPOINT_SIZE,
1672         .bDescriptorType = USB_DT_ENDPOINT,
1673         .bmAttributes   = USB_ENDPOINT_XFER_CONTROL,
1674 };
1675
1676 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1677         .enable         = dwc3_gadget_ep0_enable,
1678         .disable        = dwc3_gadget_ep0_disable,
1679         .alloc_request  = dwc3_gadget_ep_alloc_request,
1680         .free_request   = dwc3_gadget_ep_free_request,
1681         .queue          = dwc3_gadget_ep0_queue,
1682         .dequeue        = dwc3_gadget_ep_dequeue,
1683         .set_halt       = dwc3_gadget_ep0_set_halt,
1684         .set_wedge      = dwc3_gadget_ep_set_wedge,
1685 };
1686
1687 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1688         .enable         = dwc3_gadget_ep_enable,
1689         .disable        = dwc3_gadget_ep_disable,
1690         .alloc_request  = dwc3_gadget_ep_alloc_request,
1691         .free_request   = dwc3_gadget_ep_free_request,
1692         .queue          = dwc3_gadget_ep_queue,
1693         .dequeue        = dwc3_gadget_ep_dequeue,
1694         .set_halt       = dwc3_gadget_ep_set_halt,
1695         .set_wedge      = dwc3_gadget_ep_set_wedge,
1696 };
1697
1698 /* -------------------------------------------------------------------------- */
1699
1700 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1701 {
1702         struct dwc3             *dwc = gadget_to_dwc(g);
1703
1704         return __dwc3_gadget_get_frame(dwc);
1705 }
1706
1707 static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
1708 {
1709         int                     retries;
1710
1711         int                     ret;
1712         u32                     reg;
1713
1714         u8                      link_state;
1715         u8                      speed;
1716
1717         /*
1718          * According to the Databook Remote wakeup request should
1719          * be issued only when the device is in early suspend state.
1720          *
1721          * We can check that via USB Link State bits in DSTS register.
1722          */
1723         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1724
1725         speed = reg & DWC3_DSTS_CONNECTSPD;
1726         if ((speed == DWC3_DSTS_SUPERSPEED) ||
1727             (speed == DWC3_DSTS_SUPERSPEED_PLUS))
1728                 return 0;
1729
1730         link_state = DWC3_DSTS_USBLNKST(reg);
1731
1732         switch (link_state) {
1733         case DWC3_LINK_STATE_RX_DET:    /* in HS, means Early Suspend */
1734         case DWC3_LINK_STATE_U3:        /* in HS, means SUSPEND */
1735                 break;
1736         default:
1737                 return -EINVAL;
1738         }
1739
1740         ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1741         if (ret < 0) {
1742                 dev_err(dwc->dev, "failed to put link in Recovery\n");
1743                 return ret;
1744         }
1745
1746         /* Recent versions do this automatically */
1747         if (dwc->revision < DWC3_REVISION_194A) {
1748                 /* write zeroes to Link Change Request */
1749                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1750                 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1751                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1752         }
1753
1754         /* poll until Link State changes to ON */
1755         retries = 20000;
1756
1757         while (retries--) {
1758                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1759
1760                 /* in HS, means ON */
1761                 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1762                         break;
1763         }
1764
1765         if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1766                 dev_err(dwc->dev, "failed to send remote wakeup\n");
1767                 return -EINVAL;
1768         }
1769
1770         return 0;
1771 }
1772
1773 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1774 {
1775         struct dwc3             *dwc = gadget_to_dwc(g);
1776         unsigned long           flags;
1777         int                     ret;
1778
1779         spin_lock_irqsave(&dwc->lock, flags);
1780         ret = __dwc3_gadget_wakeup(dwc);
1781         spin_unlock_irqrestore(&dwc->lock, flags);
1782
1783         return ret;
1784 }
1785
1786 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1787                 int is_selfpowered)
1788 {
1789         struct dwc3             *dwc = gadget_to_dwc(g);
1790         unsigned long           flags;
1791
1792         spin_lock_irqsave(&dwc->lock, flags);
1793         g->is_selfpowered = !!is_selfpowered;
1794         spin_unlock_irqrestore(&dwc->lock, flags);
1795
1796         return 0;
1797 }
1798
1799 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
1800 {
1801         u32                     reg;
1802         u32                     timeout = 500;
1803
1804         if (pm_runtime_suspended(dwc->dev))
1805                 return 0;
1806
1807         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1808         if (is_on) {
1809                 if (dwc->revision <= DWC3_REVISION_187A) {
1810                         reg &= ~DWC3_DCTL_TRGTULST_MASK;
1811                         reg |= DWC3_DCTL_TRGTULST_RX_DET;
1812                 }
1813
1814                 if (dwc->revision >= DWC3_REVISION_194A)
1815                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1816                 reg |= DWC3_DCTL_RUN_STOP;
1817
1818                 if (dwc->has_hibernation)
1819                         reg |= DWC3_DCTL_KEEP_CONNECT;
1820
1821                 dwc->pullups_connected = true;
1822         } else {
1823                 reg &= ~DWC3_DCTL_RUN_STOP;
1824
1825                 if (dwc->has_hibernation && !suspend)
1826                         reg &= ~DWC3_DCTL_KEEP_CONNECT;
1827
1828                 dwc->pullups_connected = false;
1829         }
1830
1831         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1832
1833         do {
1834                 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1835                 reg &= DWC3_DSTS_DEVCTRLHLT;
1836         } while (--timeout && !(!is_on ^ !reg));
1837
1838         if (!timeout)
1839                 return -ETIMEDOUT;
1840
1841         return 0;
1842 }
1843
1844 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1845 {
1846         struct dwc3             *dwc = gadget_to_dwc(g);
1847         unsigned long           flags;
1848         int                     ret;
1849
1850         is_on = !!is_on;
1851
1852         /*
1853          * Per databook, when we want to stop the gadget, if a control transfer
1854          * is still in process, complete it and get the core into setup phase.
1855          */
1856         if (!is_on && dwc->ep0state != EP0_SETUP_PHASE) {
1857                 reinit_completion(&dwc->ep0_in_setup);
1858
1859                 ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
1860                                 msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
1861                 if (ret == 0) {
1862                         dev_err(dwc->dev, "timed out waiting for SETUP phase\n");
1863                         return -ETIMEDOUT;
1864                 }
1865         }
1866
1867         spin_lock_irqsave(&dwc->lock, flags);
1868         ret = dwc3_gadget_run_stop(dwc, is_on, false);
1869         spin_unlock_irqrestore(&dwc->lock, flags);
1870
1871         return ret;
1872 }
1873
1874 static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1875 {
1876         u32                     reg;
1877
1878         /* Enable all but Start and End of Frame IRQs */
1879         reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1880                         DWC3_DEVTEN_EVNTOVERFLOWEN |
1881                         DWC3_DEVTEN_CMDCMPLTEN |
1882                         DWC3_DEVTEN_ERRTICERREN |
1883                         DWC3_DEVTEN_WKUPEVTEN |
1884                         DWC3_DEVTEN_CONNECTDONEEN |
1885                         DWC3_DEVTEN_USBRSTEN |
1886                         DWC3_DEVTEN_DISCONNEVTEN);
1887
1888         if (dwc->revision < DWC3_REVISION_250A)
1889                 reg |= DWC3_DEVTEN_ULSTCNGEN;
1890
1891         dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1892 }
1893
1894 static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1895 {
1896         /* mask all interrupts */
1897         dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1898 }
1899
1900 static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1901 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1902
1903 /**
1904  * dwc3_gadget_setup_nump - calculate and initialize NUMP field of %DWC3_DCFG
1905  * @dwc: pointer to our context structure
1906  *
1907  * The following looks like complex but it's actually very simple. In order to
1908  * calculate the number of packets we can burst at once on OUT transfers, we're
1909  * gonna use RxFIFO size.
1910  *
1911  * To calculate RxFIFO size we need two numbers:
1912  * MDWIDTH = size, in bits, of the internal memory bus
1913  * RAM2_DEPTH = depth, in MDWIDTH, of internal RAM2 (where RxFIFO sits)
1914  *
1915  * Given these two numbers, the formula is simple:
1916  *
1917  * RxFIFO Size = (RAM2_DEPTH * MDWIDTH / 8) - 24 - 16;
1918  *
1919  * 24 bytes is for 3x SETUP packets
1920  * 16 bytes is a clock domain crossing tolerance
1921  *
1922  * Given RxFIFO Size, NUMP = RxFIFOSize / 1024;
1923  */
1924 static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
1925 {
1926         u32 ram2_depth;
1927         u32 mdwidth;
1928         u32 nump;
1929         u32 reg;
1930
1931         ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7);
1932         mdwidth = DWC3_GHWPARAMS0_MDWIDTH(dwc->hwparams.hwparams0);
1933
1934         nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
1935         nump = min_t(u32, nump, 16);
1936
1937         /* update NumP */
1938         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1939         reg &= ~DWC3_DCFG_NUMP_MASK;
1940         reg |= nump << DWC3_DCFG_NUMP_SHIFT;
1941         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1942 }
1943
1944 static int __dwc3_gadget_start(struct dwc3 *dwc)
1945 {
1946         struct dwc3_ep          *dep;
1947         int                     ret = 0;
1948         u32                     reg;
1949
1950         /*
1951          * Use IMOD if enabled via dwc->imod_interval. Otherwise, if
1952          * the core supports IMOD, disable it.
1953          */
1954         if (dwc->imod_interval) {
1955                 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
1956                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
1957         } else if (dwc3_has_imod(dwc)) {
1958                 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), 0);
1959         }
1960
1961         /*
1962          * We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP
1963          * field instead of letting dwc3 itself calculate that automatically.
1964          *
1965          * This way, we maximize the chances that we'll be able to get several
1966          * bursts of data without going through any sort of endpoint throttling.
1967          */
1968         reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
1969         if (dwc3_is_usb31(dwc))
1970                 reg &= ~DWC31_GRXTHRCFG_PKTCNTSEL;
1971         else
1972                 reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL;
1973
1974         dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
1975
1976         dwc3_gadget_setup_nump(dwc);
1977
1978         /* Start with SuperSpeed Default */
1979         dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1980
1981         dep = dwc->eps[0];
1982         ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
1983         if (ret) {
1984                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1985                 goto err0;
1986         }
1987
1988         dep = dwc->eps[1];
1989         ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
1990         if (ret) {
1991                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1992                 goto err1;
1993         }
1994
1995         /* begin to receive SETUP packets */
1996         dwc->ep0state = EP0_SETUP_PHASE;
1997         dwc->link_state = DWC3_LINK_STATE_SS_DIS;
1998         dwc3_ep0_out_start(dwc);
1999
2000         dwc3_gadget_enable_irq(dwc);
2001
2002         return 0;
2003
2004 err1:
2005         __dwc3_gadget_ep_disable(dwc->eps[0]);
2006
2007 err0:
2008         return ret;
2009 }
2010
2011 static int dwc3_gadget_start(struct usb_gadget *g,
2012                 struct usb_gadget_driver *driver)
2013 {
2014         struct dwc3             *dwc = gadget_to_dwc(g);
2015         unsigned long           flags;
2016         int                     ret = 0;
2017         int                     irq;
2018
2019         irq = dwc->irq_gadget;
2020         ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
2021                         IRQF_SHARED, "dwc3", dwc->ev_buf);
2022         if (ret) {
2023                 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
2024                                 irq, ret);
2025                 goto err0;
2026         }
2027
2028         spin_lock_irqsave(&dwc->lock, flags);
2029         if (dwc->gadget_driver) {
2030                 dev_err(dwc->dev, "%s is already bound to %s\n",
2031                                 dwc->gadget.name,
2032                                 dwc->gadget_driver->driver.name);
2033                 ret = -EBUSY;
2034                 goto err1;
2035         }
2036
2037         dwc->gadget_driver      = driver;
2038
2039         if (pm_runtime_active(dwc->dev))
2040                 __dwc3_gadget_start(dwc);
2041
2042         spin_unlock_irqrestore(&dwc->lock, flags);
2043
2044         return 0;
2045
2046 err1:
2047         spin_unlock_irqrestore(&dwc->lock, flags);
2048         free_irq(irq, dwc);
2049
2050 err0:
2051         return ret;
2052 }
2053
2054 static void __dwc3_gadget_stop(struct dwc3 *dwc)
2055 {
2056         dwc3_gadget_disable_irq(dwc);
2057         __dwc3_gadget_ep_disable(dwc->eps[0]);
2058         __dwc3_gadget_ep_disable(dwc->eps[1]);
2059 }
2060
2061 static int dwc3_gadget_stop(struct usb_gadget *g)
2062 {
2063         struct dwc3             *dwc = gadget_to_dwc(g);
2064         unsigned long           flags;
2065
2066         spin_lock_irqsave(&dwc->lock, flags);
2067
2068         if (pm_runtime_suspended(dwc->dev))
2069                 goto out;
2070
2071         __dwc3_gadget_stop(dwc);
2072
2073 out:
2074         dwc->gadget_driver      = NULL;
2075         spin_unlock_irqrestore(&dwc->lock, flags);
2076
2077         free_irq(dwc->irq_gadget, dwc->ev_buf);
2078
2079         return 0;
2080 }
2081
2082 static void dwc3_gadget_config_params(struct usb_gadget *g,
2083                                       struct usb_dcd_config_params *params)
2084 {
2085         struct dwc3             *dwc = gadget_to_dwc(g);
2086
2087         params->besl_baseline = USB_DEFAULT_BESL_UNSPECIFIED;
2088         params->besl_deep = USB_DEFAULT_BESL_UNSPECIFIED;
2089
2090         /* Recommended BESL */
2091         if (!dwc->dis_enblslpm_quirk) {
2092                 /*
2093                  * If the recommended BESL baseline is 0 or if the BESL deep is
2094                  * less than 2, Microsoft's Windows 10 host usb stack will issue
2095                  * a usb reset immediately after it receives the extended BOS
2096                  * descriptor and the enumeration will fail. To maintain
2097                  * compatibility with the Windows' usb stack, let's set the
2098                  * recommended BESL baseline to 1 and clamp the BESL deep to be
2099                  * within 2 to 15.
2100                  */
2101                 params->besl_baseline = 1;
2102                 if (dwc->is_utmi_l1_suspend)
2103                         params->besl_deep =
2104                                 clamp_t(u8, dwc->hird_threshold, 2, 15);
2105         }
2106
2107         /* U1 Device exit Latency */
2108         if (dwc->dis_u1_entry_quirk)
2109                 params->bU1devExitLat = 0;
2110         else
2111                 params->bU1devExitLat = DWC3_DEFAULT_U1_DEV_EXIT_LAT;
2112
2113         /* U2 Device exit Latency */
2114         if (dwc->dis_u2_entry_quirk)
2115                 params->bU2DevExitLat = 0;
2116         else
2117                 params->bU2DevExitLat =
2118                                 cpu_to_le16(DWC3_DEFAULT_U2_DEV_EXIT_LAT);
2119 }
2120
2121 static void dwc3_gadget_set_speed(struct usb_gadget *g,
2122                                   enum usb_device_speed speed)
2123 {
2124         struct dwc3             *dwc = gadget_to_dwc(g);
2125         unsigned long           flags;
2126         u32                     reg;
2127
2128         spin_lock_irqsave(&dwc->lock, flags);
2129         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2130         reg &= ~(DWC3_DCFG_SPEED_MASK);
2131
2132         /*
2133          * WORKAROUND: DWC3 revision < 2.20a have an issue
2134          * which would cause metastability state on Run/Stop
2135          * bit if we try to force the IP to USB2-only mode.
2136          *
2137          * Because of that, we cannot configure the IP to any
2138          * speed other than the SuperSpeed
2139          *
2140          * Refers to:
2141          *
2142          * STAR#9000525659: Clock Domain Crossing on DCTL in
2143          * USB 2.0 Mode
2144          */
2145         if (dwc->revision < DWC3_REVISION_220A &&
2146             !dwc->dis_metastability_quirk) {
2147                 reg |= DWC3_DCFG_SUPERSPEED;
2148         } else {
2149                 switch (speed) {
2150                 case USB_SPEED_LOW:
2151                         reg |= DWC3_DCFG_LOWSPEED;
2152                         break;
2153                 case USB_SPEED_FULL:
2154                         reg |= DWC3_DCFG_FULLSPEED;
2155                         break;
2156                 case USB_SPEED_HIGH:
2157                         reg |= DWC3_DCFG_HIGHSPEED;
2158                         break;
2159                 case USB_SPEED_SUPER:
2160                         reg |= DWC3_DCFG_SUPERSPEED;
2161                         break;
2162                 case USB_SPEED_SUPER_PLUS:
2163                         if (dwc3_is_usb31(dwc))
2164                                 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
2165                         else
2166                                 reg |= DWC3_DCFG_SUPERSPEED;
2167                         break;
2168                 default:
2169                         dev_err(dwc->dev, "invalid speed (%d)\n", speed);
2170
2171                         if (dwc->revision & DWC3_REVISION_IS_DWC31)
2172                                 reg |= DWC3_DCFG_SUPERSPEED_PLUS;
2173                         else
2174                                 reg |= DWC3_DCFG_SUPERSPEED;
2175                 }
2176         }
2177         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2178
2179         spin_unlock_irqrestore(&dwc->lock, flags);
2180 }
2181
2182 static const struct usb_gadget_ops dwc3_gadget_ops = {
2183         .get_frame              = dwc3_gadget_get_frame,
2184         .wakeup                 = dwc3_gadget_wakeup,
2185         .set_selfpowered        = dwc3_gadget_set_selfpowered,
2186         .pullup                 = dwc3_gadget_pullup,
2187         .udc_start              = dwc3_gadget_start,
2188         .udc_stop               = dwc3_gadget_stop,
2189         .udc_set_speed          = dwc3_gadget_set_speed,
2190         .get_config_params      = dwc3_gadget_config_params,
2191 };
2192
2193 /* -------------------------------------------------------------------------- */
2194
2195 static int dwc3_gadget_init_control_endpoint(struct dwc3_ep *dep)
2196 {
2197         struct dwc3 *dwc = dep->dwc;
2198
2199         usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
2200         dep->endpoint.maxburst = 1;
2201         dep->endpoint.ops = &dwc3_gadget_ep0_ops;
2202         if (!dep->direction)
2203                 dwc->gadget.ep0 = &dep->endpoint;
2204
2205         dep->endpoint.caps.type_control = true;
2206
2207         return 0;
2208 }
2209
2210 static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
2211 {
2212         struct dwc3 *dwc = dep->dwc;
2213         int mdwidth;
2214         int kbytes;
2215         int size;
2216
2217         mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
2218         /* MDWIDTH is represented in bits, we need it in bytes */
2219         mdwidth /= 8;
2220
2221         size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1));
2222         if (dwc3_is_usb31(dwc))
2223                 size = DWC31_GTXFIFOSIZ_TXFDEF(size);
2224         else
2225                 size = DWC3_GTXFIFOSIZ_TXFDEF(size);
2226
2227         /* FIFO Depth is in MDWDITH bytes. Multiply */
2228         size *= mdwidth;
2229
2230         kbytes = size / 1024;
2231         if (kbytes == 0)
2232                 kbytes = 1;
2233
2234         /*
2235          * FIFO sizes account an extra MDWIDTH * (kbytes + 1) bytes for
2236          * internal overhead. We don't really know how these are used,
2237          * but documentation say it exists.
2238          */
2239         size -= mdwidth * (kbytes + 1);
2240         size /= kbytes;
2241
2242         usb_ep_set_maxpacket_limit(&dep->endpoint, size);
2243
2244         dep->endpoint.max_streams = 15;
2245         dep->endpoint.ops = &dwc3_gadget_ep_ops;
2246         list_add_tail(&dep->endpoint.ep_list,
2247                         &dwc->gadget.ep_list);
2248         dep->endpoint.caps.type_iso = true;
2249         dep->endpoint.caps.type_bulk = true;
2250         dep->endpoint.caps.type_int = true;
2251
2252         return dwc3_alloc_trb_pool(dep);
2253 }
2254
2255 static int dwc3_gadget_init_out_endpoint(struct dwc3_ep *dep)
2256 {
2257         struct dwc3 *dwc = dep->dwc;
2258
2259         usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
2260         dep->endpoint.max_streams = 15;
2261         dep->endpoint.ops = &dwc3_gadget_ep_ops;
2262         list_add_tail(&dep->endpoint.ep_list,
2263                         &dwc->gadget.ep_list);
2264         dep->endpoint.caps.type_iso = true;
2265         dep->endpoint.caps.type_bulk = true;
2266         dep->endpoint.caps.type_int = true;
2267
2268         return dwc3_alloc_trb_pool(dep);
2269 }
2270
2271 static int dwc3_gadget_init_endpoint(struct dwc3 *dwc, u8 epnum)
2272 {
2273         struct dwc3_ep                  *dep;
2274         bool                            direction = epnum & 1;
2275         int                             ret;
2276         u8                              num = epnum >> 1;
2277
2278         dep = kzalloc(sizeof(*dep), GFP_KERNEL);
2279         if (!dep)
2280                 return -ENOMEM;
2281
2282         dep->dwc = dwc;
2283         dep->number = epnum;
2284         dep->direction = direction;
2285         dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
2286         dwc->eps[epnum] = dep;
2287         dep->combo_num = 0;
2288         dep->start_cmd_status = 0;
2289
2290         snprintf(dep->name, sizeof(dep->name), "ep%u%s", num,
2291                         direction ? "in" : "out");
2292
2293         dep->endpoint.name = dep->name;
2294
2295         if (!(dep->number > 1)) {
2296                 dep->endpoint.desc = &dwc3_gadget_ep0_desc;
2297                 dep->endpoint.comp_desc = NULL;
2298         }
2299
2300         if (num == 0)
2301                 ret = dwc3_gadget_init_control_endpoint(dep);
2302         else if (direction)
2303                 ret = dwc3_gadget_init_in_endpoint(dep);
2304         else
2305                 ret = dwc3_gadget_init_out_endpoint(dep);
2306
2307         if (ret)
2308                 return ret;
2309
2310         dep->endpoint.caps.dir_in = direction;
2311         dep->endpoint.caps.dir_out = !direction;
2312
2313         INIT_LIST_HEAD(&dep->pending_list);
2314         INIT_LIST_HEAD(&dep->started_list);
2315         INIT_LIST_HEAD(&dep->cancelled_list);
2316
2317         return 0;
2318 }
2319
2320 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc, u8 total)
2321 {
2322         u8                              epnum;
2323
2324         INIT_LIST_HEAD(&dwc->gadget.ep_list);
2325
2326         for (epnum = 0; epnum < total; epnum++) {
2327                 int                     ret;
2328
2329                 ret = dwc3_gadget_init_endpoint(dwc, epnum);
2330                 if (ret)
2331                         return ret;
2332         }
2333
2334         return 0;
2335 }
2336
2337 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
2338 {
2339         struct dwc3_ep                  *dep;
2340         u8                              epnum;
2341
2342         for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2343                 dep = dwc->eps[epnum];
2344                 if (!dep)
2345                         continue;
2346                 /*
2347                  * Physical endpoints 0 and 1 are special; they form the
2348                  * bi-directional USB endpoint 0.
2349                  *
2350                  * For those two physical endpoints, we don't allocate a TRB
2351                  * pool nor do we add them the endpoints list. Due to that, we
2352                  * shouldn't do these two operations otherwise we would end up
2353                  * with all sorts of bugs when removing dwc3.ko.
2354                  */
2355                 if (epnum != 0 && epnum != 1) {
2356                         dwc3_free_trb_pool(dep);
2357                         list_del(&dep->endpoint.ep_list);
2358                 }
2359
2360                 kfree(dep);
2361         }
2362 }
2363
2364 /* -------------------------------------------------------------------------- */
2365
2366 static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
2367                 struct dwc3_request *req, struct dwc3_trb *trb,
2368                 const struct dwc3_event_depevt *event, int status, int chain)
2369 {
2370         unsigned int            count;
2371
2372         dwc3_ep_inc_deq(dep);
2373
2374         trace_dwc3_complete_trb(dep, trb);
2375         req->num_trbs--;
2376
2377         /*
2378          * If we're in the middle of series of chained TRBs and we
2379          * receive a short transfer along the way, DWC3 will skip
2380          * through all TRBs including the last TRB in the chain (the
2381          * where CHN bit is zero. DWC3 will also avoid clearing HWO
2382          * bit and SW has to do it manually.
2383          *
2384          * We're going to do that here to avoid problems of HW trying
2385          * to use bogus TRBs for transfers.
2386          */
2387         if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO))
2388                 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
2389
2390         /*
2391          * For isochronous transfers, the first TRB in a service interval must
2392          * have the Isoc-First type. Track and report its interval frame number.
2393          */
2394         if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
2395             (trb->ctrl & DWC3_TRBCTL_ISOCHRONOUS_FIRST)) {
2396                 unsigned int frame_number;
2397
2398                 frame_number = DWC3_TRB_CTRL_GET_SID_SOFN(trb->ctrl);
2399                 frame_number &= ~(dep->interval - 1);
2400                 req->request.frame_number = frame_number;
2401         }
2402
2403         /*
2404          * If we're dealing with unaligned size OUT transfer, we will be left
2405          * with one TRB pending in the ring. We need to manually clear HWO bit
2406          * from that TRB.
2407          */
2408
2409         if (req->needs_extra_trb && !(trb->ctrl & DWC3_TRB_CTRL_CHN)) {
2410                 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
2411                 return 1;
2412         }
2413
2414         count = trb->size & DWC3_TRB_SIZE_MASK;
2415         req->remaining += count;
2416
2417         if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
2418                 return 1;
2419
2420         if (event->status & DEPEVT_STATUS_SHORT && !chain)
2421                 return 1;
2422
2423         if (event->status & DEPEVT_STATUS_IOC)
2424                 return 1;
2425
2426         return 0;
2427 }
2428
2429 static int dwc3_gadget_ep_reclaim_trb_sg(struct dwc3_ep *dep,
2430                 struct dwc3_request *req, const struct dwc3_event_depevt *event,
2431                 int status)
2432 {
2433         struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];
2434         struct scatterlist *sg = req->sg;
2435         struct scatterlist *s;
2436         unsigned int pending = req->num_pending_sgs;
2437         unsigned int i;
2438         int ret = 0;
2439
2440         for_each_sg(sg, s, pending, i) {
2441                 trb = &dep->trb_pool[dep->trb_dequeue];
2442
2443                 if (trb->ctrl & DWC3_TRB_CTRL_HWO)
2444                         break;
2445
2446                 req->sg = sg_next(s);
2447                 req->num_pending_sgs--;
2448
2449                 ret = dwc3_gadget_ep_reclaim_completed_trb(dep, req,
2450                                 trb, event, status, true);
2451                 if (ret)
2452                         break;
2453         }
2454
2455         return ret;
2456 }
2457
2458 static int dwc3_gadget_ep_reclaim_trb_linear(struct dwc3_ep *dep,
2459                 struct dwc3_request *req, const struct dwc3_event_depevt *event,
2460                 int status)
2461 {
2462         struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];
2463
2464         return dwc3_gadget_ep_reclaim_completed_trb(dep, req, trb,
2465                         event, status, false);
2466 }
2467
2468 static bool dwc3_gadget_ep_request_completed(struct dwc3_request *req)
2469 {
2470         return req->request.actual == req->request.length;
2471 }
2472
2473 static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
2474                 const struct dwc3_event_depevt *event,
2475                 struct dwc3_request *req, int status)
2476 {
2477         int ret;
2478
2479         if (req->num_pending_sgs)
2480                 ret = dwc3_gadget_ep_reclaim_trb_sg(dep, req, event,
2481                                 status);
2482         else
2483                 ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
2484                                 status);
2485
2486         if (req->needs_extra_trb) {
2487                 ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
2488                                 status);
2489                 req->needs_extra_trb = false;
2490         }
2491
2492         req->request.actual = req->request.length - req->remaining;
2493
2494         if (!dwc3_gadget_ep_request_completed(req) &&
2495                         req->num_pending_sgs) {
2496                 __dwc3_gadget_kick_transfer(dep);
2497                 goto out;
2498         }
2499
2500         dwc3_gadget_giveback(dep, req, status);
2501
2502 out:
2503         return ret;
2504 }
2505
2506 static void dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
2507                 const struct dwc3_event_depevt *event, int status)
2508 {
2509         struct dwc3_request     *req;
2510         struct dwc3_request     *tmp;
2511
2512         list_for_each_entry_safe(req, tmp, &dep->started_list, list) {
2513                 int ret;
2514
2515                 ret = dwc3_gadget_ep_cleanup_completed_request(dep, event,
2516                                 req, status);
2517                 if (ret)
2518                         break;
2519         }
2520 }
2521
2522 static void dwc3_gadget_endpoint_frame_from_event(struct dwc3_ep *dep,
2523                 const struct dwc3_event_depevt *event)
2524 {
2525         dep->frame_number = event->parameters;
2526 }
2527
2528 static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
2529                 const struct dwc3_event_depevt *event)
2530 {
2531         struct dwc3             *dwc = dep->dwc;
2532         unsigned                status = 0;
2533         bool                    stop = false;
2534
2535         dwc3_gadget_endpoint_frame_from_event(dep, event);
2536
2537         if (event->status & DEPEVT_STATUS_BUSERR)
2538                 status = -ECONNRESET;
2539
2540         if (event->status & DEPEVT_STATUS_MISSED_ISOC) {
2541                 status = -EXDEV;
2542
2543                 if (list_empty(&dep->started_list))
2544                         stop = true;
2545         }
2546
2547         dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);
2548
2549         if (stop) {
2550                 dwc3_stop_active_transfer(dep, true, true);
2551                 dep->flags = DWC3_EP_ENABLED;
2552         }
2553
2554         /*
2555          * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
2556          * See dwc3_gadget_linksts_change_interrupt() for 1st half.
2557          */
2558         if (dwc->revision < DWC3_REVISION_183A) {
2559                 u32             reg;
2560                 int             i;
2561
2562                 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
2563                         dep = dwc->eps[i];
2564
2565                         if (!(dep->flags & DWC3_EP_ENABLED))
2566                                 continue;
2567
2568                         if (!list_empty(&dep->started_list))
2569                                 return;
2570                 }
2571
2572                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2573                 reg |= dwc->u1u2;
2574                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2575
2576                 dwc->u1u2 = 0;
2577         }
2578 }
2579
2580 static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,
2581                 const struct dwc3_event_depevt *event)
2582 {
2583         dwc3_gadget_endpoint_frame_from_event(dep, event);
2584         (void) __dwc3_gadget_start_isoc(dep);
2585 }
2586
2587 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
2588                 const struct dwc3_event_depevt *event)
2589 {
2590         struct dwc3_ep          *dep;
2591         u8                      epnum = event->endpoint_number;
2592         u8                      cmd;
2593
2594         dep = dwc->eps[epnum];
2595
2596         if (!(dep->flags & DWC3_EP_ENABLED)) {
2597                 if (!(dep->flags & DWC3_EP_TRANSFER_STARTED))
2598                         return;
2599
2600                 /* Handle only EPCMDCMPLT when EP disabled */
2601                 if (event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT)
2602                         return;
2603         }
2604
2605         if (epnum == 0 || epnum == 1) {
2606                 dwc3_ep0_interrupt(dwc, event);
2607                 return;
2608         }
2609
2610         switch (event->endpoint_event) {
2611         case DWC3_DEPEVT_XFERINPROGRESS:
2612                 dwc3_gadget_endpoint_transfer_in_progress(dep, event);
2613                 break;
2614         case DWC3_DEPEVT_XFERNOTREADY:
2615                 dwc3_gadget_endpoint_transfer_not_ready(dep, event);
2616                 break;
2617         case DWC3_DEPEVT_EPCMDCMPLT:
2618                 cmd = DEPEVT_PARAMETER_CMD(event->parameters);
2619
2620                 if (cmd == DWC3_DEPCMD_ENDTRANSFER) {
2621                         dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
2622                         dwc3_gadget_ep_cleanup_cancelled_requests(dep);
2623                 }
2624                 break;
2625         case DWC3_DEPEVT_STREAMEVT:
2626         case DWC3_DEPEVT_XFERCOMPLETE:
2627         case DWC3_DEPEVT_RXTXFIFOEVT:
2628                 break;
2629         }
2630 }
2631
2632 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
2633 {
2634         if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
2635                 spin_unlock(&dwc->lock);
2636                 dwc->gadget_driver->disconnect(&dwc->gadget);
2637                 spin_lock(&dwc->lock);
2638         }
2639 }
2640
2641 static void dwc3_suspend_gadget(struct dwc3 *dwc)
2642 {
2643         if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
2644                 spin_unlock(&dwc->lock);
2645                 dwc->gadget_driver->suspend(&dwc->gadget);
2646                 spin_lock(&dwc->lock);
2647         }
2648 }
2649
2650 static void dwc3_resume_gadget(struct dwc3 *dwc)
2651 {
2652         if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2653                 spin_unlock(&dwc->lock);
2654                 dwc->gadget_driver->resume(&dwc->gadget);
2655                 spin_lock(&dwc->lock);
2656         }
2657 }
2658
2659 static void dwc3_reset_gadget(struct dwc3 *dwc)
2660 {
2661         if (!dwc->gadget_driver)
2662                 return;
2663
2664         if (dwc->gadget.speed != USB_SPEED_UNKNOWN) {
2665                 spin_unlock(&dwc->lock);
2666                 usb_gadget_udc_reset(&dwc->gadget, dwc->gadget_driver);
2667                 spin_lock(&dwc->lock);
2668         }
2669 }
2670
2671 static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
2672         bool interrupt)
2673 {
2674         struct dwc3 *dwc = dep->dwc;
2675         struct dwc3_gadget_ep_cmd_params params;
2676         u32 cmd;
2677         int ret;
2678
2679         if (!(dep->flags & DWC3_EP_TRANSFER_STARTED))
2680                 return;
2681
2682         /*
2683          * NOTICE: We are violating what the Databook says about the
2684          * EndTransfer command. Ideally we would _always_ wait for the
2685          * EndTransfer Command Completion IRQ, but that's causing too
2686          * much trouble synchronizing between us and gadget driver.
2687          *
2688          * We have discussed this with the IP Provider and it was
2689          * suggested to giveback all requests here, but give HW some
2690          * extra time to synchronize with the interconnect. We're using
2691          * an arbitrary 100us delay for that.
2692          *
2693          * Note also that a similar handling was tested by Synopsys
2694          * (thanks a lot Paul) and nothing bad has come out of it.
2695          * In short, what we're doing is:
2696          *
2697          * - Issue EndTransfer WITH CMDIOC bit set
2698          * - Wait 100us
2699          *
2700          * As of IP version 3.10a of the DWC_usb3 IP, the controller
2701          * supports a mode to work around the above limitation. The
2702          * software can poll the CMDACT bit in the DEPCMD register
2703          * after issuing a EndTransfer command. This mode is enabled
2704          * by writing GUCTL2[14]. This polling is already done in the
2705          * dwc3_send_gadget_ep_cmd() function so if the mode is
2706          * enabled, the EndTransfer command will have completed upon
2707          * returning from this function and we don't need to delay for
2708          * 100us.
2709          *
2710          * This mode is NOT available on the DWC_usb31 IP.
2711          */
2712
2713         cmd = DWC3_DEPCMD_ENDTRANSFER;
2714         cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
2715         cmd |= interrupt ? DWC3_DEPCMD_CMDIOC : 0;
2716         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
2717         memset(&params, 0, sizeof(params));
2718         ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
2719         WARN_ON_ONCE(ret);
2720         dep->resource_index = 0;
2721
2722         if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A)
2723                 udelay(100);
2724 }
2725
2726 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2727 {
2728         u32 epnum;
2729
2730         for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2731                 struct dwc3_ep *dep;
2732                 int ret;
2733
2734                 dep = dwc->eps[epnum];
2735                 if (!dep)
2736                         continue;
2737
2738                 if (!(dep->flags & DWC3_EP_STALL))
2739                         continue;
2740
2741                 dep->flags &= ~DWC3_EP_STALL;
2742
2743                 ret = dwc3_send_clear_stall_ep_cmd(dep);
2744                 WARN_ON_ONCE(ret);
2745         }
2746 }
2747
2748 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2749 {
2750         int                     reg;
2751
2752         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2753         reg &= ~DWC3_DCTL_INITU1ENA;
2754         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2755
2756         reg &= ~DWC3_DCTL_INITU2ENA;
2757         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2758
2759         dwc3_disconnect_gadget(dwc);
2760
2761         dwc->gadget.speed = USB_SPEED_UNKNOWN;
2762         dwc->setup_packet_pending = false;
2763         usb_gadget_set_state(&dwc->gadget, USB_STATE_NOTATTACHED);
2764
2765         dwc->connected = false;
2766 }
2767
2768 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2769 {
2770         u32                     reg;
2771
2772         dwc->connected = true;
2773
2774         /*
2775          * WORKAROUND: DWC3 revisions <1.88a have an issue which
2776          * would cause a missing Disconnect Event if there's a
2777          * pending Setup Packet in the FIFO.
2778          *
2779          * There's no suggested workaround on the official Bug
2780          * report, which states that "unless the driver/application
2781          * is doing any special handling of a disconnect event,
2782          * there is no functional issue".
2783          *
2784          * Unfortunately, it turns out that we _do_ some special
2785          * handling of a disconnect event, namely complete all
2786          * pending transfers, notify gadget driver of the
2787          * disconnection, and so on.
2788          *
2789          * Our suggested workaround is to follow the Disconnect
2790          * Event steps here, instead, based on a setup_packet_pending
2791          * flag. Such flag gets set whenever we have a SETUP_PENDING
2792          * status for EP0 TRBs and gets cleared on XferComplete for the
2793          * same endpoint.
2794          *
2795          * Refers to:
2796          *
2797          * STAR#9000466709: RTL: Device : Disconnect event not
2798          * generated if setup packet pending in FIFO
2799          */
2800         if (dwc->revision < DWC3_REVISION_188A) {
2801                 if (dwc->setup_packet_pending)
2802                         dwc3_gadget_disconnect_interrupt(dwc);
2803         }
2804
2805         dwc3_reset_gadget(dwc);
2806
2807         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2808         reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2809         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2810         dwc->test_mode = false;
2811         dwc3_clear_stall_all_ep(dwc);
2812
2813         /* Reset device address to zero */
2814         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2815         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2816         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2817 }
2818
2819 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2820 {
2821         struct dwc3_ep          *dep;
2822         int                     ret;
2823         u32                     reg;
2824         u8                      speed;
2825
2826         reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2827         speed = reg & DWC3_DSTS_CONNECTSPD;
2828         dwc->speed = speed;
2829
2830         /*
2831          * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2832          * each time on Connect Done.
2833          *
2834          * Currently we always use the reset value. If any platform
2835          * wants to set this to a different value, we need to add a
2836          * setting and update GCTL.RAMCLKSEL here.
2837          */
2838
2839         switch (speed) {
2840         case DWC3_DSTS_SUPERSPEED_PLUS:
2841                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2842                 dwc->gadget.ep0->maxpacket = 512;
2843                 dwc->gadget.speed = USB_SPEED_SUPER_PLUS;
2844                 break;
2845         case DWC3_DSTS_SUPERSPEED:
2846                 /*
2847                  * WORKAROUND: DWC3 revisions <1.90a have an issue which
2848                  * would cause a missing USB3 Reset event.
2849                  *
2850                  * In such situations, we should force a USB3 Reset
2851                  * event by calling our dwc3_gadget_reset_interrupt()
2852                  * routine.
2853                  *
2854                  * Refers to:
2855                  *
2856                  * STAR#9000483510: RTL: SS : USB3 reset event may
2857                  * not be generated always when the link enters poll
2858                  */
2859                 if (dwc->revision < DWC3_REVISION_190A)
2860                         dwc3_gadget_reset_interrupt(dwc);
2861
2862                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2863                 dwc->gadget.ep0->maxpacket = 512;
2864                 dwc->gadget.speed = USB_SPEED_SUPER;
2865                 break;
2866         case DWC3_DSTS_HIGHSPEED:
2867                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2868                 dwc->gadget.ep0->maxpacket = 64;
2869                 dwc->gadget.speed = USB_SPEED_HIGH;
2870                 break;
2871         case DWC3_DSTS_FULLSPEED:
2872                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2873                 dwc->gadget.ep0->maxpacket = 64;
2874                 dwc->gadget.speed = USB_SPEED_FULL;
2875                 break;
2876         case DWC3_DSTS_LOWSPEED:
2877                 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2878                 dwc->gadget.ep0->maxpacket = 8;
2879                 dwc->gadget.speed = USB_SPEED_LOW;
2880                 break;
2881         }
2882
2883         dwc->eps[1]->endpoint.maxpacket = dwc->gadget.ep0->maxpacket;
2884
2885         /* Enable USB2 LPM Capability */
2886
2887         if ((dwc->revision > DWC3_REVISION_194A) &&
2888             (speed != DWC3_DSTS_SUPERSPEED) &&
2889             (speed != DWC3_DSTS_SUPERSPEED_PLUS)) {
2890                 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2891                 reg |= DWC3_DCFG_LPM_CAP;
2892                 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2893
2894                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2895                 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2896
2897                 reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold |
2898                                             (dwc->is_utmi_l1_suspend << 4));
2899
2900                 /*
2901                  * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
2902                  * DCFG.LPMCap is set, core responses with an ACK and the
2903                  * BESL value in the LPM token is less than or equal to LPM
2904                  * NYET threshold.
2905                  */
2906                 WARN_ONCE(dwc->revision < DWC3_REVISION_240A
2907                                 && dwc->has_lpm_erratum,
2908                                 "LPM Erratum not available on dwc3 revisions < 2.40a\n");
2909
2910                 if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A)
2911                         reg |= DWC3_DCTL_NYET_THRES(dwc->lpm_nyet_threshold);
2912
2913                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2914         } else {
2915                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2916                 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
2917                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2918         }
2919
2920         dep = dwc->eps[0];
2921         ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
2922         if (ret) {
2923                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2924                 return;
2925         }
2926
2927         dep = dwc->eps[1];
2928         ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
2929         if (ret) {
2930                 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2931                 return;
2932         }
2933
2934         /*
2935          * Configure PHY via GUSB3PIPECTLn if required.
2936          *
2937          * Update GTXFIFOSIZn
2938          *
2939          * In both cases reset values should be sufficient.
2940          */
2941 }
2942
2943 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2944 {
2945         /*
2946          * TODO take core out of low power mode when that's
2947          * implemented.
2948          */
2949
2950         if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2951                 spin_unlock(&dwc->lock);
2952                 dwc->gadget_driver->resume(&dwc->gadget);
2953                 spin_lock(&dwc->lock);
2954         }
2955 }
2956
2957 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2958                 unsigned int evtinfo)
2959 {
2960         enum dwc3_link_state    next = evtinfo & DWC3_LINK_STATE_MASK;
2961         unsigned int            pwropt;
2962
2963         /*
2964          * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2965          * Hibernation mode enabled which would show up when device detects
2966          * host-initiated U3 exit.
2967          *
2968          * In that case, device will generate a Link State Change Interrupt
2969          * from U3 to RESUME which is only necessary if Hibernation is
2970          * configured in.
2971          *
2972          * There are no functional changes due to such spurious event and we
2973          * just need to ignore it.
2974          *
2975          * Refers to:
2976          *
2977          * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2978          * operational mode
2979          */
2980         pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
2981         if ((dwc->revision < DWC3_REVISION_250A) &&
2982                         (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
2983                 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
2984                                 (next == DWC3_LINK_STATE_RESUME)) {
2985                         return;
2986                 }
2987         }
2988
2989         /*
2990          * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2991          * on the link partner, the USB session might do multiple entry/exit
2992          * of low power states before a transfer takes place.
2993          *
2994          * Due to this problem, we might experience lower throughput. The
2995          * suggested workaround is to disable DCTL[12:9] bits if we're
2996          * transitioning from U1/U2 to U0 and enable those bits again
2997          * after a transfer completes and there are no pending transfers
2998          * on any of the enabled endpoints.
2999          *
3000          * This is the first half of that workaround.
3001          *
3002          * Refers to:
3003          *
3004          * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
3005          * core send LGO_Ux entering U0
3006          */
3007         if (dwc->revision < DWC3_REVISION_183A) {
3008                 if (next == DWC3_LINK_STATE_U0) {
3009                         u32     u1u2;
3010                         u32     reg;
3011
3012                         switch (dwc->link_state) {
3013                         case DWC3_LINK_STATE_U1:
3014                         case DWC3_LINK_STATE_U2:
3015                                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
3016                                 u1u2 = reg & (DWC3_DCTL_INITU2ENA
3017                                                 | DWC3_DCTL_ACCEPTU2ENA
3018                                                 | DWC3_DCTL_INITU1ENA
3019                                                 | DWC3_DCTL_ACCEPTU1ENA);
3020
3021                                 if (!dwc->u1u2)
3022                                         dwc->u1u2 = reg & u1u2;
3023
3024                                 reg &= ~u1u2;
3025
3026                                 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
3027                                 break;
3028                         default:
3029                                 /* do nothing */
3030                                 break;
3031                         }
3032                 }
3033         }
3034
3035         switch (next) {
3036         case DWC3_LINK_STATE_U1:
3037                 if (dwc->speed == USB_SPEED_SUPER)
3038                         dwc3_suspend_gadget(dwc);
3039                 break;
3040         case DWC3_LINK_STATE_U2:
3041         case DWC3_LINK_STATE_U3:
3042                 dwc3_suspend_gadget(dwc);
3043                 break;
3044         case DWC3_LINK_STATE_RESUME:
3045                 dwc3_resume_gadget(dwc);
3046                 break;
3047         default:
3048                 /* do nothing */
3049                 break;
3050         }
3051
3052         dwc->link_state = next;
3053 }
3054
3055 static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
3056                                           unsigned int evtinfo)
3057 {
3058         enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
3059
3060         if (dwc->link_state != next && next == DWC3_LINK_STATE_U3)
3061                 dwc3_suspend_gadget(dwc);
3062
3063         dwc->link_state = next;
3064 }
3065
3066 static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
3067                 unsigned int evtinfo)
3068 {
3069         unsigned int is_ss = evtinfo & BIT(4);
3070
3071         /*
3072          * WORKAROUND: DWC3 revison 2.20a with hibernation support
3073          * have a known issue which can cause USB CV TD.9.23 to fail
3074          * randomly.
3075          *
3076          * Because of this issue, core could generate bogus hibernation
3077          * events which SW needs to ignore.
3078          *
3079          * Refers to:
3080          *
3081          * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
3082          * Device Fallback from SuperSpeed
3083          */
3084         if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
3085                 return;
3086
3087         /* enter hibernation here */
3088 }
3089
3090 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
3091                 const struct dwc3_event_devt *event)
3092 {
3093         switch (event->type) {
3094         case DWC3_DEVICE_EVENT_DISCONNECT:
3095                 dwc3_gadget_disconnect_interrupt(dwc);
3096                 break;
3097         case DWC3_DEVICE_EVENT_RESET:
3098                 dwc3_gadget_reset_interrupt(dwc);
3099                 break;
3100         case DWC3_DEVICE_EVENT_CONNECT_DONE:
3101                 dwc3_gadget_conndone_interrupt(dwc);
3102                 break;
3103         case DWC3_DEVICE_EVENT_WAKEUP:
3104                 dwc3_gadget_wakeup_interrupt(dwc);
3105                 break;
3106         case DWC3_DEVICE_EVENT_HIBER_REQ:
3107                 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
3108                                         "unexpected hibernation event\n"))
3109                         break;
3110
3111                 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
3112                 break;
3113         case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
3114                 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
3115                 break;
3116         case DWC3_DEVICE_EVENT_EOPF:
3117                 /* It changed to be suspend event for version 2.30a and above */
3118                 if (dwc->revision >= DWC3_REVISION_230A) {
3119                         /*
3120                          * Ignore suspend event until the gadget enters into
3121                          * USB_STATE_CONFIGURED state.
3122                          */
3123                         if (dwc->gadget.state >= USB_STATE_CONFIGURED)
3124                                 dwc3_gadget_suspend_interrupt(dwc,
3125                                                 event->event_info);
3126                 }
3127                 break;
3128         case DWC3_DEVICE_EVENT_SOF:
3129         case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
3130         case DWC3_DEVICE_EVENT_CMD_CMPL:
3131         case DWC3_DEVICE_EVENT_OVERFLOW:
3132                 break;
3133         default:
3134                 dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
3135         }
3136 }
3137
3138 static void dwc3_process_event_entry(struct dwc3 *dwc,
3139                 const union dwc3_event *event)
3140 {
3141         trace_dwc3_event(event->raw, dwc);
3142
3143         if (!event->type.is_devspec)
3144                 dwc3_endpoint_interrupt(dwc, &event->depevt);
3145         else if (event->type.type == DWC3_EVENT_TYPE_DEV)
3146                 dwc3_gadget_interrupt(dwc, &event->devt);
3147         else
3148                 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
3149 }
3150
3151 static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
3152 {
3153         struct dwc3 *dwc = evt->dwc;
3154         irqreturn_t ret = IRQ_NONE;
3155         int left;
3156         u32 reg;
3157
3158         left = evt->count;
3159
3160         if (!(evt->flags & DWC3_EVENT_PENDING))
3161                 return IRQ_NONE;
3162
3163         while (left > 0) {
3164                 union dwc3_event event;
3165
3166                 event.raw = *(u32 *) (evt->cache + evt->lpos);
3167
3168                 dwc3_process_event_entry(dwc, &event);
3169
3170                 /*
3171                  * FIXME we wrap around correctly to the next entry as
3172                  * almost all entries are 4 bytes in size. There is one
3173                  * entry which has 12 bytes which is a regular entry
3174                  * followed by 8 bytes data. ATM I don't know how
3175                  * things are organized if we get next to the a
3176                  * boundary so I worry about that once we try to handle
3177                  * that.
3178                  */
3179                 evt->lpos = (evt->lpos + 4) % evt->length;
3180                 left -= 4;
3181         }
3182
3183         evt->count = 0;
3184         evt->flags &= ~DWC3_EVENT_PENDING;
3185         ret = IRQ_HANDLED;
3186
3187         /* Unmask interrupt */
3188         reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
3189         reg &= ~DWC3_GEVNTSIZ_INTMASK;
3190         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
3191
3192         if (dwc->imod_interval) {
3193                 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
3194                 dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
3195         }
3196
3197         return ret;
3198 }
3199
3200 static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
3201 {
3202         struct dwc3_event_buffer *evt = _evt;
3203         struct dwc3 *dwc = evt->dwc;
3204         unsigned long flags;
3205         irqreturn_t ret = IRQ_NONE;
3206
3207         spin_lock_irqsave(&dwc->lock, flags);
3208         ret = dwc3_process_event_buf(evt);
3209         spin_unlock_irqrestore(&dwc->lock, flags);
3210
3211         return ret;
3212 }
3213
3214 static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
3215 {
3216         struct dwc3 *dwc = evt->dwc;
3217         u32 amount;
3218         u32 count;
3219         u32 reg;
3220
3221         if (pm_runtime_suspended(dwc->dev)) {
3222                 pm_runtime_get(dwc->dev);
3223                 disable_irq_nosync(dwc->irq_gadget);
3224                 dwc->pending_events = true;
3225                 return IRQ_HANDLED;
3226         }
3227
3228         /*
3229          * With PCIe legacy interrupt, test shows that top-half irq handler can
3230          * be called again after HW interrupt deassertion. Check if bottom-half
3231          * irq event handler completes before caching new event to prevent
3232          * losing events.
3233          */
3234         if (evt->flags & DWC3_EVENT_PENDING)
3235                 return IRQ_HANDLED;
3236
3237         count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
3238         count &= DWC3_GEVNTCOUNT_MASK;
3239         if (!count)
3240                 return IRQ_NONE;
3241
3242         evt->count = count;
3243         evt->flags |= DWC3_EVENT_PENDING;
3244
3245         /* Mask interrupt */
3246         reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
3247         reg |= DWC3_GEVNTSIZ_INTMASK;
3248         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
3249
3250         amount = min(count, evt->length - evt->lpos);
3251         memcpy(evt->cache + evt->lpos, evt->buf + evt->lpos, amount);
3252
3253         if (amount < count)
3254                 memcpy(evt->cache, evt->buf, count - amount);
3255
3256         dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count);
3257
3258         return IRQ_WAKE_THREAD;
3259 }
3260
3261 static irqreturn_t dwc3_interrupt(int irq, void *_evt)
3262 {
3263         struct dwc3_event_buffer        *evt = _evt;
3264
3265         return dwc3_check_event_buf(evt);
3266 }
3267
3268 static int dwc3_gadget_get_irq(struct dwc3 *dwc)
3269 {
3270         struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
3271         int irq;
3272
3273         irq = platform_get_irq_byname_optional(dwc3_pdev, "peripheral");
3274         if (irq > 0)
3275                 goto out;
3276
3277         if (irq == -EPROBE_DEFER)
3278                 goto out;
3279
3280         irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
3281         if (irq > 0)
3282                 goto out;
3283
3284         if (irq == -EPROBE_DEFER)
3285                 goto out;
3286
3287         irq = platform_get_irq(dwc3_pdev, 0);
3288         if (irq > 0)
3289                 goto out;
3290
3291         if (!irq)
3292                 irq = -EINVAL;
3293
3294 out:
3295         return irq;
3296 }
3297
3298 /**
3299  * dwc3_gadget_init - initializes gadget related registers
3300  * @dwc: pointer to our controller context structure
3301  *
3302  * Returns 0 on success otherwise negative errno.
3303  */
3304 int dwc3_gadget_init(struct dwc3 *dwc)
3305 {
3306         int ret;
3307         int irq;
3308
3309         irq = dwc3_gadget_get_irq(dwc);
3310         if (irq < 0) {
3311                 ret = irq;
3312                 goto err0;
3313         }
3314
3315         dwc->irq_gadget = irq;
3316
3317         dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
3318                                           sizeof(*dwc->ep0_trb) * 2,
3319                                           &dwc->ep0_trb_addr, GFP_KERNEL);
3320         if (!dwc->ep0_trb) {
3321                 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
3322                 ret = -ENOMEM;
3323                 goto err0;
3324         }
3325
3326         dwc->setup_buf = kzalloc(DWC3_EP0_SETUP_SIZE, GFP_KERNEL);
3327         if (!dwc->setup_buf) {
3328                 ret = -ENOMEM;
3329                 goto err1;
3330         }
3331
3332         dwc->bounce = dma_alloc_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE,
3333                         &dwc->bounce_addr, GFP_KERNEL);
3334         if (!dwc->bounce) {
3335                 ret = -ENOMEM;
3336                 goto err2;
3337         }
3338
3339         init_completion(&dwc->ep0_in_setup);
3340
3341         dwc->gadget.ops                 = &dwc3_gadget_ops;
3342         dwc->gadget.speed               = USB_SPEED_UNKNOWN;
3343         dwc->gadget.sg_supported        = true;
3344         dwc->gadget.name                = "dwc3-gadget";
3345         dwc->gadget.lpm_capable         = true;
3346
3347         /*
3348          * FIXME We might be setting max_speed to <SUPER, however versions
3349          * <2.20a of dwc3 have an issue with metastability (documented
3350          * elsewhere in this driver) which tells us we can't set max speed to
3351          * anything lower than SUPER.
3352          *
3353          * Because gadget.max_speed is only used by composite.c and function
3354          * drivers (i.e. it won't go into dwc3's registers) we are allowing this
3355          * to happen so we avoid sending SuperSpeed Capability descriptor
3356          * together with our BOS descriptor as that could confuse host into
3357          * thinking we can handle super speed.
3358          *
3359          * Note that, in fact, we won't even support GetBOS requests when speed
3360          * is less than super speed because we don't have means, yet, to tell
3361          * composite.c that we are USB 2.0 + LPM ECN.
3362          */
3363         if (dwc->revision < DWC3_REVISION_220A &&
3364             !dwc->dis_metastability_quirk)
3365                 dev_info(dwc->dev, "changing max_speed on rev %08x\n",
3366                                 dwc->revision);
3367
3368         dwc->gadget.max_speed           = dwc->maximum_speed;
3369
3370         /*
3371          * REVISIT: Here we should clear all pending IRQs to be
3372          * sure we're starting from a well known location.
3373          */
3374
3375         ret = dwc3_gadget_init_endpoints(dwc, dwc->num_eps);
3376         if (ret)
3377                 goto err3;
3378
3379         ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
3380         if (ret) {
3381                 dev_err(dwc->dev, "failed to register udc\n");
3382                 goto err4;
3383         }
3384
3385         dwc3_gadget_set_speed(&dwc->gadget, dwc->maximum_speed);
3386
3387         return 0;
3388
3389 err4:
3390         dwc3_gadget_free_endpoints(dwc);
3391
3392 err3:
3393         dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
3394                         dwc->bounce_addr);
3395
3396 err2:
3397         kfree(dwc->setup_buf);
3398
3399 err1:
3400         dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
3401                         dwc->ep0_trb, dwc->ep0_trb_addr);
3402
3403 err0:
3404         return ret;
3405 }
3406
3407 /* -------------------------------------------------------------------------- */
3408
3409 void dwc3_gadget_exit(struct dwc3 *dwc)
3410 {
3411         usb_del_gadget_udc(&dwc->gadget);
3412         dwc3_gadget_free_endpoints(dwc);
3413         dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
3414                           dwc->bounce_addr);
3415         kfree(dwc->setup_buf);
3416         dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
3417                           dwc->ep0_trb, dwc->ep0_trb_addr);
3418 }
3419
3420 int dwc3_gadget_suspend(struct dwc3 *dwc)
3421 {
3422         if (!dwc->gadget_driver)
3423                 return 0;
3424
3425         dwc3_gadget_run_stop(dwc, false, false);
3426         dwc3_disconnect_gadget(dwc);
3427         __dwc3_gadget_stop(dwc);
3428
3429         return 0;
3430 }
3431
3432 int dwc3_gadget_resume(struct dwc3 *dwc)
3433 {
3434         int                     ret;
3435
3436         if (!dwc->gadget_driver)
3437                 return 0;
3438
3439         ret = __dwc3_gadget_start(dwc);
3440         if (ret < 0)
3441                 goto err0;
3442
3443         ret = dwc3_gadget_run_stop(dwc, true, false);
3444         if (ret < 0)
3445                 goto err1;
3446
3447         return 0;
3448
3449 err1:
3450         __dwc3_gadget_stop(dwc);
3451
3452 err0:
3453         return ret;
3454 }
3455
3456 void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
3457 {
3458         if (dwc->pending_events) {
3459                 dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf);
3460                 dwc->pending_events = false;
3461                 enable_irq(dwc->irq_gadget);
3462         }
3463 }