drivers/usb/dwc3/ep0.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ep0.c - DesignWare USB3 DRD Controller Endpoint 0 Handling
   4  *
   5  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   6  *
   7  * Authors: Felipe Balbi <balbi@ti.com>,
   8  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/slab.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/io.h>
  18 #include <linux/list.h>
  19 #include <linux/dma-mapping.h>
  20
  21 #include <linux/usb/ch9.h>
  22 #include <linux/usb/gadget.h>
  23 #include <linux/usb/composite.h>
  24
  25 #include "core.h"
  26 #include "debug.h"
  27 #include "gadget.h"
  28 #include "io.h"
  29
  30 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
  31 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
  32                 struct dwc3_ep *dep, struct dwc3_request *req);
  33
  34 static void dwc3_ep0_prepare_one_trb(struct dwc3_ep *dep,
  35                 dma_addr_t buf_dma, u32 len, u32 type, bool chain)
  36 {
  37         struct dwc3_trb                 *trb;
  38         struct dwc3                     *dwc;
  39
  40         dwc = dep->dwc;
  41         trb = &dwc->ep0_trb[dep->trb_enqueue];
  42
  43         if (chain)
  44                 dep->trb_enqueue++;
  45
  46         trb->bpl = lower_32_bits(buf_dma);
  47         trb->bph = upper_32_bits(buf_dma);
  48         trb->size = len;
  49         trb->ctrl = type;
  50
  51         trb->ctrl |= (DWC3_TRB_CTRL_HWO
  52                         | DWC3_TRB_CTRL_ISP_IMI);
  53
  54         if (chain)
  55                 trb->ctrl |= DWC3_TRB_CTRL_CHN;
  56         else
  57                 trb->ctrl |= (DWC3_TRB_CTRL_IOC
  58                                 | DWC3_TRB_CTRL_LST);
  59
  60         trace_dwc3_prepare_trb(dep, trb);
  61 }
  62
  63 static int dwc3_ep0_start_trans(struct dwc3_ep *dep)
  64 {
  65         struct dwc3_gadget_ep_cmd_params params;
  66         struct dwc3                     *dwc;
  67         int                             ret;
  68
  69         if (dep->flags & DWC3_EP_TRANSFER_STARTED)
  70                 return 0;
  71
  72         dwc = dep->dwc;
  73
  74         memset(&params, 0, sizeof(params));
  75         params.param0 = upper_32_bits(dwc->ep0_trb_addr);
  76         params.param1 = lower_32_bits(dwc->ep0_trb_addr);
  77
  78         ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_STARTTRANSFER, &params);
  79         if (ret < 0)
  80                 return ret;
  81
  82         dwc->ep0_next_event = DWC3_EP0_COMPLETE;
  83
  84         return 0;
  85 }
  86
  87 static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep,
  88                 struct dwc3_request *req)
  89 {
  90         struct dwc3             *dwc = dep->dwc;
  91
  92         req->request.actual     = 0;
  93         req->request.status     = -EINPROGRESS;
  94         req->epnum              = dep->number;
  95
  96         list_add_tail(&req->list, &dep->pending_list);
  97
  98         /*
  99          * Gadget driver might not be quick enough to queue a request
 100          * before we get a Transfer Not Ready event on this endpoint.
 101          *
 102          * In that case, we will set DWC3_EP_PENDING_REQUEST. When that
 103          * flag is set, it's telling us that as soon as Gadget queues the
 104          * required request, we should kick the transfer here because the
 105          * IRQ we were waiting for is long gone.
 106          */
 107         if (dep->flags & DWC3_EP_PENDING_REQUEST) {
 108                 unsigned        direction;
 109
 110                 direction = !!(dep->flags & DWC3_EP0_DIR_IN);
 111
 112                 if (dwc->ep0state != EP0_DATA_PHASE) {
 113                         dev_WARN(dwc->dev, "Unexpected pending request\n");
 114                         return 0;
 115                 }
 116
 117                 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
 118
 119                 dep->flags &= ~(DWC3_EP_PENDING_REQUEST |
 120                                 DWC3_EP0_DIR_IN);
 121
 122                 return 0;
 123         }
 124
 125         /*
 126          * In case gadget driver asked us to delay the STATUS phase,
 127          * handle it here.
 128          */
 129         if (dwc->delayed_status) {
 130                 unsigned        direction;
 131
 132                 direction = !dwc->ep0_expect_in;
 133                 dwc->delayed_status = false;
 134                 usb_gadget_set_state(&dwc->gadget, USB_STATE_CONFIGURED);
 135
 136                 if (dwc->ep0state == EP0_STATUS_PHASE)
 137                         __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
 138
 139                 return 0;
 140         }
 141
 142         /*
 143          * Unfortunately we have uncovered a limitation wrt the Data Phase.
 144          *
 145          * Section 9.4 says we can wait for the XferNotReady(DATA) event to
 146          * come before issueing Start Transfer command, but if we do, we will
 147          * miss situations where the host starts another SETUP phase instead of
 148          * the DATA phase.  Such cases happen at least on TD.7.6 of the Link
 149          * Layer Compliance Suite.
 150          *
 151          * The problem surfaces due to the fact that in case of back-to-back
 152          * SETUP packets there will be no XferNotReady(DATA) generated and we
 153          * will be stuck waiting for XferNotReady(DATA) forever.
 154          *
 155          * By looking at tables 9-13 and 9-14 of the Databook, we can see that
 156          * it tells us to start Data Phase right away. It also mentions that if
 157          * we receive a SETUP phase instead of the DATA phase, core will issue
 158          * XferComplete for the DATA phase, before actually initiating it in
 159          * the wire, with the TRB's status set to "SETUP_PENDING". Such status
 160          * can only be used to print some debugging logs, as the core expects
 161          * us to go through to the STATUS phase and start a CONTROL_STATUS TRB,
 162          * just so it completes right away, without transferring anything and,
 163          * only then, we can go back to the SETUP phase.
 164          *
 165          * Because of this scenario, SNPS decided to change the programming
 166          * model of control transfers and support on-demand transfers only for
 167          * the STATUS phase. To fix the issue we have now, we will always wait
 168          * for gadget driver to queue the DATA phase's struct usb_request, then
 169          * start it right away.
 170          *
 171          * If we're actually in a 2-stage transfer, we will wait for
 172          * XferNotReady(STATUS).
 173          */
 174         if (dwc->three_stage_setup) {
 175                 unsigned        direction;
 176
 177                 direction = dwc->ep0_expect_in;
 178                 dwc->ep0state = EP0_DATA_PHASE;
 179
 180                 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
 181
 182                 dep->flags &= ~DWC3_EP0_DIR_IN;
 183         }
 184
 185         return 0;
 186 }
 187
 188 int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
 189                 gfp_t gfp_flags)
 190 {
 191         struct dwc3_request             *req = to_dwc3_request(request);
 192         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 193         struct dwc3                     *dwc = dep->dwc;
 194
 195         unsigned long                   flags;
 196
 197         int                             ret;
 198
 199         spin_lock_irqsave(&dwc->lock, flags);
 200         if (!dep->endpoint.desc) {
 201                 dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
 202                                 dep->name);
 203                 ret = -ESHUTDOWN;
 204                 goto out;
 205         }
 206
 207         /* we share one TRB for ep0/1 */
 208         if (!list_empty(&dep->pending_list)) {
 209                 ret = -EBUSY;
 210                 goto out;
 211         }
 212
 213         ret = __dwc3_gadget_ep0_queue(dep, req);
 214
 215 out:
 216         spin_unlock_irqrestore(&dwc->lock, flags);
 217
 218         return ret;
 219 }
 220
 221 static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
 222 {
 223         struct dwc3_ep          *dep;
 224
 225         /* reinitialize physical ep1 */
 226         dep = dwc->eps[1];
 227         dep->flags = DWC3_EP_ENABLED;
 228
 229         /* stall is always issued on EP0 */
 230         dep = dwc->eps[0];
 231         __dwc3_gadget_ep_set_halt(dep, 1, false);
 232         dep->flags = DWC3_EP_ENABLED;
 233         dwc->delayed_status = false;
 234
 235         if (!list_empty(&dep->pending_list)) {
 236                 struct dwc3_request     *req;
 237
 238                 req = next_request(&dep->pending_list);
 239                 dwc3_gadget_giveback(dep, req, -ECONNRESET);
 240         }
 241
 242         dwc->ep0state = EP0_SETUP_PHASE;
 243         dwc3_ep0_out_start(dwc);
 244 }
 245
 246 int __dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
 247 {
 248         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 249         struct dwc3                     *dwc = dep->dwc;
 250
 251         dwc3_ep0_stall_and_restart(dwc);
 252
 253         return 0;
 254 }
 255
 256 int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
 257 {
 258         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 259         struct dwc3                     *dwc = dep->dwc;
 260         unsigned long                   flags;
 261         int                             ret;
 262
 263         spin_lock_irqsave(&dwc->lock, flags);
 264         ret = __dwc3_gadget_ep0_set_halt(ep, value);
 265         spin_unlock_irqrestore(&dwc->lock, flags);
 266
 267         return ret;
 268 }
 269
 270 void dwc3_ep0_out_start(struct dwc3 *dwc)
 271 {
 272         struct dwc3_ep                  *dep;
 273         int                             ret;
 274
 275         complete(&dwc->ep0_in_setup);
 276
 277         dep = dwc->eps[0];
 278         dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 8,
 279                         DWC3_TRBCTL_CONTROL_SETUP, false);
 280         ret = dwc3_ep0_start_trans(dep);
 281         WARN_ON(ret < 0);
 282 }
 283
 284 static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
 285 {
 286         struct dwc3_ep          *dep;
 287         u32                     windex = le16_to_cpu(wIndex_le);
 288         u32                     epnum;
 289
 290         epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1;
 291         if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
 292                 epnum |= 1;
 293
 294         dep = dwc->eps[epnum];
 295         if (dep->flags & DWC3_EP_ENABLED)
 296                 return dep;
 297
 298         return NULL;
 299 }
 300
 301 static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
 302 {
 303 }
 304 /*
 305  * ch 9.4.5
 306  */
 307 static int dwc3_ep0_handle_status(struct dwc3 *dwc,
 308                 struct usb_ctrlrequest *ctrl)
 309 {
 310         struct dwc3_ep          *dep;
 311         u32                     recip;
 312         u32                     value;
 313         u32                     reg;
 314         u16                     usb_status = 0;
 315         __le16                  *response_pkt;
 316
 317         /* We don't support PTM_STATUS */
 318         value = le16_to_cpu(ctrl->wValue);
 319         if (value != 0)
 320                 return -EINVAL;
 321
 322         recip = ctrl->bRequestType & USB_RECIP_MASK;
 323         switch (recip) {
 324         case USB_RECIP_DEVICE:
 325                 /*
 326                  * LTM will be set once we know how to set this in HW.
 327                  */
 328                 usb_status |= dwc->gadget.is_selfpowered;
 329
 330                 if ((dwc->speed == DWC3_DSTS_SUPERSPEED) ||
 331                     (dwc->speed == DWC3_DSTS_SUPERSPEED_PLUS)) {
 332                         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 333                         if (reg & DWC3_DCTL_INITU1ENA)
 334                                 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
 335                         if (reg & DWC3_DCTL_INITU2ENA)
 336                                 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
 337                 }
 338
 339                 break;
 340
 341         case USB_RECIP_INTERFACE:
 342                 /*
 343                  * Function Remote Wake Capable D0
 344                  * Function Remote Wakeup       D1
 345                  */
 346                 break;
 347
 348         case USB_RECIP_ENDPOINT:
 349                 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
 350                 if (!dep)
 351                         return -EINVAL;
 352
 353                 if (dep->flags & DWC3_EP_STALL)
 354                         usb_status = 1 << USB_ENDPOINT_HALT;
 355                 break;
 356         default:
 357                 return -EINVAL;
 358         }
 359
 360         response_pkt = (__le16 *) dwc->setup_buf;
 361         *response_pkt = cpu_to_le16(usb_status);
 362
 363         dep = dwc->eps[0];
 364         dwc->ep0_usb_req.dep = dep;
 365         dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
 366         dwc->ep0_usb_req.request.buf = dwc->setup_buf;
 367         dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
 368
 369         return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
 370 }
 371
 372 static int dwc3_ep0_handle_u1(struct dwc3 *dwc, enum usb_device_state state,
 373                 int set)
 374 {
 375         u32 reg;
 376
 377         if (state != USB_STATE_CONFIGURED)
 378                 return -EINVAL;
 379         if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
 380                         (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
 381                 return -EINVAL;
 382
 383         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 384         if (set)
 385                 reg |= DWC3_DCTL_INITU1ENA;
 386         else
 387                 reg &= ~DWC3_DCTL_INITU1ENA;
 388         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 389
 390         return 0;
 391 }
 392
 393 static int dwc3_ep0_handle_u2(struct dwc3 *dwc, enum usb_device_state state,
 394                 int set)
 395 {
 396         u32 reg;
 397
 398
 399         if (state != USB_STATE_CONFIGURED)
 400                 return -EINVAL;
 401         if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
 402                         (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
 403                 return -EINVAL;
 404
 405         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 406         if (set)
 407                 reg |= DWC3_DCTL_INITU2ENA;
 408         else
 409                 reg &= ~DWC3_DCTL_INITU2ENA;
 410         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 411
 412         return 0;
 413 }
 414
 415 static int dwc3_ep0_handle_test(struct dwc3 *dwc, enum usb_device_state state,
 416                 u32 wIndex, int set)
 417 {
 418         if ((wIndex & 0xff) != 0)
 419                 return -EINVAL;
 420         if (!set)
 421                 return -EINVAL;
 422
 423         switch (wIndex >> 8) {
 424         case TEST_J:
 425         case TEST_K:
 426         case TEST_SE0_NAK:
 427         case TEST_PACKET:
 428         case TEST_FORCE_EN:
 429                 dwc->test_mode_nr = wIndex >> 8;
 430                 dwc->test_mode = true;
 431                 break;
 432         default:
 433                 return -EINVAL;
 434         }
 435
 436         return 0;
 437 }
 438
 439 static int dwc3_ep0_handle_device(struct dwc3 *dwc,
 440                 struct usb_ctrlrequest *ctrl, int set)
 441 {
 442         enum usb_device_state   state;
 443         u32                     wValue;
 444         u32                     wIndex;
 445         int                     ret = 0;
 446
 447         wValue = le16_to_cpu(ctrl->wValue);
 448         wIndex = le16_to_cpu(ctrl->wIndex);
 449         state = dwc->gadget.state;
 450
 451         switch (wValue) {
 452         case USB_DEVICE_REMOTE_WAKEUP:
 453                 break;
 454         /*
 455          * 9.4.1 says only only for SS, in AddressState only for
 456          * default control pipe
 457          */
 458         case USB_DEVICE_U1_ENABLE:
 459                 ret = dwc3_ep0_handle_u1(dwc, state, set);
 460                 break;
 461         case USB_DEVICE_U2_ENABLE:
 462                 ret = dwc3_ep0_handle_u2(dwc, state, set);
 463                 break;
 464         case USB_DEVICE_LTM_ENABLE:
 465                 ret = -EINVAL;
 466                 break;
 467         case USB_DEVICE_TEST_MODE:
 468                 ret = dwc3_ep0_handle_test(dwc, state, wIndex, set);
 469                 break;
 470         default:
 471                 ret = -EINVAL;
 472         }
 473
 474         return ret;
 475 }
 476
 477 static int dwc3_ep0_handle_intf(struct dwc3 *dwc,
 478                 struct usb_ctrlrequest *ctrl, int set)
 479 {
 480         u32                     wValue;
 481         int                     ret = 0;
 482
 483         wValue = le16_to_cpu(ctrl->wValue);
 484
 485         switch (wValue) {
 486         case USB_INTRF_FUNC_SUSPEND:
 487                 /*
 488                  * REVISIT: Ideally we would enable some low power mode here,
 489                  * however it's unclear what we should be doing here.
 490                  *
 491                  * For now, we're not doing anything, just making sure we return
 492                  * 0 so USB Command Verifier tests pass without any errors.
 493                  */
 494                 break;
 495         default:
 496                 ret = -EINVAL;
 497         }
 498
 499         return ret;
 500 }
 501
 502 static int dwc3_ep0_handle_endpoint(struct dwc3 *dwc,
 503                 struct usb_ctrlrequest *ctrl, int set)
 504 {
 505         struct dwc3_ep          *dep;
 506         u32                     wValue;
 507         int                     ret;
 508
 509         wValue = le16_to_cpu(ctrl->wValue);
 510
 511         switch (wValue) {
 512         case USB_ENDPOINT_HALT:
 513                 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
 514                 if (!dep)
 515                         return -EINVAL;
 516
 517                 if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
 518                         break;
 519
 520                 ret = __dwc3_gadget_ep_set_halt(dep, set, true);
 521                 if (ret)
 522                         return -EINVAL;
 523                 break;
 524         default:
 525                 return -EINVAL;
 526         }
 527
 528         return 0;
 529 }
 530
 531 static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
 532                 struct usb_ctrlrequest *ctrl, int set)
 533 {
 534         u32                     recip;
 535         int                     ret;
 536
 537         recip = ctrl->bRequestType & USB_RECIP_MASK;
 538
 539         switch (recip) {
 540         case USB_RECIP_DEVICE:
 541                 ret = dwc3_ep0_handle_device(dwc, ctrl, set);
 542                 break;
 543         case USB_RECIP_INTERFACE:
 544                 ret = dwc3_ep0_handle_intf(dwc, ctrl, set);
 545                 break;
 546         case USB_RECIP_ENDPOINT:
 547                 ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set);
 548                 break;
 549         default:
 550                 ret = -EINVAL;
 551         }
 552
 553         return ret;
 554 }
 555
 556 static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 557 {
 558         enum usb_device_state state = dwc->gadget.state;
 559         u32 addr;
 560         u32 reg;
 561
 562         addr = le16_to_cpu(ctrl->wValue);
 563         if (addr > 127) {
 564                 dev_err(dwc->dev, "invalid device address %d\n", addr);
 565                 return -EINVAL;
 566         }
 567
 568         if (state == USB_STATE_CONFIGURED) {
 569                 dev_err(dwc->dev, "can't SetAddress() from Configured State\n");
 570                 return -EINVAL;
 571         }
 572
 573         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
 574         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
 575         reg |= DWC3_DCFG_DEVADDR(addr);
 576         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
 577
 578         if (addr)
 579                 usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS);
 580         else
 581                 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
 582
 583         return 0;
 584 }
 585
 586 static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 587 {
 588         int ret;
 589
 590         spin_unlock(&dwc->lock);
 591         ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl);
 592         spin_lock(&dwc->lock);
 593         return ret;
 594 }
 595
 596 static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 597 {
 598         enum usb_device_state state = dwc->gadget.state;
 599         u32 cfg;
 600         int ret;
 601         u32 reg;
 602
 603         cfg = le16_to_cpu(ctrl->wValue);
 604
 605         switch (state) {
 606         case USB_STATE_DEFAULT:
 607                 return -EINVAL;
 608
 609         case USB_STATE_ADDRESS:
 610                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 611                 /* if the cfg matches and the cfg is non zero */
 612                 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
 613
 614                         /*
 615                          * only change state if set_config has already
 616                          * been processed. If gadget driver returns
 617                          * USB_GADGET_DELAYED_STATUS, we will wait
 618                          * to change the state on the next usb_ep_queue()
 619                          */
 620                         if (ret == 0)
 621                                 usb_gadget_set_state(&dwc->gadget,
 622                                                 USB_STATE_CONFIGURED);
 623
 624                         /*
 625                          * Enable transition to U1/U2 state when
 626                          * nothing is pending from application.
 627                          */
 628                         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 629                         reg |= (DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA);
 630                         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 631                 }
 632                 break;
 633
 634         case USB_STATE_CONFIGURED:
 635                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 636                 if (!cfg && !ret)
 637                         usb_gadget_set_state(&dwc->gadget,
 638                                         USB_STATE_ADDRESS);
 639                 break;
 640         default:
 641                 ret = -EINVAL;
 642         }
 643         return ret;
 644 }
 645
 646 static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
 647 {
 648         struct dwc3_ep  *dep = to_dwc3_ep(ep);
 649         struct dwc3     *dwc = dep->dwc;
 650
 651         u32             param = 0;
 652         u32             reg;
 653
 654         struct timing {
 655                 u8      u1sel;
 656                 u8      u1pel;
 657                 __le16  u2sel;
 658                 __le16  u2pel;
 659         } __packed timing;
 660
 661         int             ret;
 662
 663         memcpy(&timing, req->buf, sizeof(timing));
 664
 665         dwc->u1sel = timing.u1sel;
 666         dwc->u1pel = timing.u1pel;
 667         dwc->u2sel = le16_to_cpu(timing.u2sel);
 668         dwc->u2pel = le16_to_cpu(timing.u2pel);
 669
 670         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 671         if (reg & DWC3_DCTL_INITU2ENA)
 672                 param = dwc->u2pel;
 673         if (reg & DWC3_DCTL_INITU1ENA)
 674                 param = dwc->u1pel;
 675
 676         /*
 677          * According to Synopsys Databook, if parameter is
 678          * greater than 125, a value of zero should be
 679          * programmed in the register.
 680          */
 681         if (param > 125)
 682                 param = 0;
 683
 684         /* now that we have the time, issue DGCMD Set Sel */
 685         ret = dwc3_send_gadget_generic_command(dwc,
 686                         DWC3_DGCMD_SET_PERIODIC_PAR, param);
 687         WARN_ON(ret < 0);
 688 }
 689
 690 static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 691 {
 692         struct dwc3_ep  *dep;
 693         enum usb_device_state state = dwc->gadget.state;
 694         u16             wLength;
 695
 696         if (state == USB_STATE_DEFAULT)
 697                 return -EINVAL;
 698
 699         wLength = le16_to_cpu(ctrl->wLength);
 700
 701         if (wLength != 6) {
 702                 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
 703                                 wLength);
 704                 return -EINVAL;
 705         }
 706
 707         /*
 708          * To handle Set SEL we need to receive 6 bytes from Host. So let's
 709          * queue a usb_request for 6 bytes.
 710          *
 711          * Remember, though, this controller can't handle non-wMaxPacketSize
 712          * aligned transfers on the OUT direction, so we queue a request for
 713          * wMaxPacketSize instead.
 714          */
 715         dep = dwc->eps[0];
 716         dwc->ep0_usb_req.dep = dep;
 717         dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
 718         dwc->ep0_usb_req.request.buf = dwc->setup_buf;
 719         dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
 720
 721         return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
 722 }
 723
 724 static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 725 {
 726         u16             wLength;
 727         u16             wValue;
 728         u16             wIndex;
 729
 730         wValue = le16_to_cpu(ctrl->wValue);
 731         wLength = le16_to_cpu(ctrl->wLength);
 732         wIndex = le16_to_cpu(ctrl->wIndex);
 733
 734         if (wIndex || wLength)
 735                 return -EINVAL;
 736
 737         dwc->gadget.isoch_delay = wValue;
 738
 739         return 0;
 740 }
 741
 742 static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 743 {
 744         int ret;
 745
 746         switch (ctrl->bRequest) {
 747         case USB_REQ_GET_STATUS:
 748                 ret = dwc3_ep0_handle_status(dwc, ctrl);
 749                 break;
 750         case USB_REQ_CLEAR_FEATURE:
 751                 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
 752                 break;
 753         case USB_REQ_SET_FEATURE:
 754                 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
 755                 break;
 756         case USB_REQ_SET_ADDRESS:
 757                 ret = dwc3_ep0_set_address(dwc, ctrl);
 758                 break;
 759         case USB_REQ_SET_CONFIGURATION:
 760                 ret = dwc3_ep0_set_config(dwc, ctrl);
 761                 break;
 762         case USB_REQ_SET_SEL:
 763                 ret = dwc3_ep0_set_sel(dwc, ctrl);
 764                 break;
 765         case USB_REQ_SET_ISOCH_DELAY:
 766                 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
 767                 break;
 768         default:
 769                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 770                 break;
 771         }
 772
 773         return ret;
 774 }
 775
 776 static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
 777                 const struct dwc3_event_depevt *event)
 778 {
 779         struct usb_ctrlrequest *ctrl = (void *) dwc->ep0_trb;
 780         int ret = -EINVAL;
 781         u32 len;
 782
 783         if (!dwc->gadget_driver)
 784                 goto out;
 785
 786         trace_dwc3_ctrl_req(ctrl);
 787
 788         len = le16_to_cpu(ctrl->wLength);
 789         if (!len) {
 790                 dwc->three_stage_setup = false;
 791                 dwc->ep0_expect_in = false;
 792                 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
 793         } else {
 794                 dwc->three_stage_setup = true;
 795                 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
 796                 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
 797         }
 798
 799         if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
 800                 ret = dwc3_ep0_std_request(dwc, ctrl);
 801         else
 802                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 803
 804         if (ret == USB_GADGET_DELAYED_STATUS)
 805                 dwc->delayed_status = true;
 806
 807 out:
 808         if (ret < 0)
 809                 dwc3_ep0_stall_and_restart(dwc);
 810 }
 811
 812 static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 813                 const struct dwc3_event_depevt *event)
 814 {
 815         struct dwc3_request     *r;
 816         struct usb_request      *ur;
 817         struct dwc3_trb         *trb;
 818         struct dwc3_ep          *ep0;
 819         u32                     transferred = 0;
 820         u32                     status;
 821         u32                     length;
 822         u8                      epnum;
 823
 824         epnum = event->endpoint_number;
 825         ep0 = dwc->eps[0];
 826
 827         dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
 828         trb = dwc->ep0_trb;
 829         trace_dwc3_complete_trb(ep0, trb);
 830
 831         r = next_request(&ep0->pending_list);
 832         if (!r)
 833                 return;
 834
 835         status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 836         if (status == DWC3_TRBSTS_SETUP_PENDING) {
 837                 dwc->setup_packet_pending = true;
 838                 if (r)
 839                         dwc3_gadget_giveback(ep0, r, -ECONNRESET);
 840
 841                 return;
 842         }
 843
 844         ur = &r->request;
 845
 846         length = trb->size & DWC3_TRB_SIZE_MASK;
 847         transferred = ur->length - length;
 848         ur->actual += transferred;
 849
 850         if ((IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) &&
 851              ur->length && ur->zero) || dwc->ep0_bounced) {
 852                 trb++;
 853                 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
 854                 trace_dwc3_complete_trb(ep0, trb);
 855
 856                 if (r->direction)
 857                         dwc->eps[1]->trb_enqueue = 0;
 858                 else
 859                         dwc->eps[0]->trb_enqueue = 0;
 860
 861                 dwc->ep0_bounced = false;
 862         }
 863
 864         if ((epnum & 1) && ur->actual < ur->length)
 865                 dwc3_ep0_stall_and_restart(dwc);
 866         else
 867                 dwc3_gadget_giveback(ep0, r, 0);
 868 }
 869
 870 static void dwc3_ep0_complete_status(struct dwc3 *dwc,
 871                 const struct dwc3_event_depevt *event)
 872 {
 873         struct dwc3_request     *r;
 874         struct dwc3_ep          *dep;
 875         struct dwc3_trb         *trb;
 876         u32                     status;
 877
 878         dep = dwc->eps[0];
 879         trb = dwc->ep0_trb;
 880
 881         trace_dwc3_complete_trb(dep, trb);
 882
 883         if (!list_empty(&dep->pending_list)) {
 884                 r = next_request(&dep->pending_list);
 885
 886                 dwc3_gadget_giveback(dep, r, 0);
 887         }
 888
 889         if (dwc->test_mode) {
 890                 int ret;
 891
 892                 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
 893                 if (ret < 0) {
 894                         dev_err(dwc->dev, "invalid test #%d\n",
 895                                         dwc->test_mode_nr);
 896                         dwc3_ep0_stall_and_restart(dwc);
 897                         return;
 898                 }
 899         }
 900
 901         status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 902         if (status == DWC3_TRBSTS_SETUP_PENDING)
 903                 dwc->setup_packet_pending = true;
 904
 905         dwc->ep0state = EP0_SETUP_PHASE;
 906         dwc3_ep0_out_start(dwc);
 907 }
 908
 909 static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
 910                         const struct dwc3_event_depevt *event)
 911 {
 912         struct dwc3_ep          *dep = dwc->eps[event->endpoint_number];
 913
 914         dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
 915         dep->resource_index = 0;
 916         dwc->setup_packet_pending = false;
 917
 918         switch (dwc->ep0state) {
 919         case EP0_SETUP_PHASE:
 920                 dwc3_ep0_inspect_setup(dwc, event);
 921                 break;
 922
 923         case EP0_DATA_PHASE:
 924                 dwc3_ep0_complete_data(dwc, event);
 925                 break;
 926
 927         case EP0_STATUS_PHASE:
 928                 dwc3_ep0_complete_status(dwc, event);
 929                 break;
 930         default:
 931                 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
 932         }
 933 }
 934
 935 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
 936                 struct dwc3_ep *dep, struct dwc3_request *req)
 937 {
 938         int                     ret;
 939
 940         req->direction = !!dep->number;
 941
 942         if (req->request.length == 0) {
 943                 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 0,
 944                                 DWC3_TRBCTL_CONTROL_DATA, false);
 945                 ret = dwc3_ep0_start_trans(dep);
 946         } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
 947                         && (dep->number == 0)) {
 948                 u32     maxpacket;
 949                 u32     rem;
 950
 951                 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
 952                                 &req->request, dep->number);
 953                 if (ret)
 954                         return;
 955
 956                 maxpacket = dep->endpoint.maxpacket;
 957                 rem = req->request.length % maxpacket;
 958                 dwc->ep0_bounced = true;
 959
 960                 /* prepare normal TRB */
 961                 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
 962                                          req->request.length,
 963                                          DWC3_TRBCTL_CONTROL_DATA,
 964                                          true);
 965
 966                 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1];
 967
 968                 /* Now prepare one extra TRB to align transfer size */
 969                 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr,
 970                                          maxpacket - rem,
 971                                          DWC3_TRBCTL_CONTROL_DATA,
 972                                          false);
 973                 ret = dwc3_ep0_start_trans(dep);
 974         } else if (IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) &&
 975                    req->request.length && req->request.zero) {
 976
 977                 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
 978                                 &req->request, dep->number);
 979                 if (ret)
 980                         return;
 981
 982                 /* prepare normal TRB */
 983                 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
 984                                          req->request.length,
 985                                          DWC3_TRBCTL_CONTROL_DATA,
 986                                          true);
 987
 988                 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1];
 989
 990                 /* Now prepare one extra TRB to align transfer size */
 991                 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr,
 992                                          0, DWC3_TRBCTL_CONTROL_DATA,
 993                                          false);
 994                 ret = dwc3_ep0_start_trans(dep);
 995         } else {
 996                 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
 997                                 &req->request, dep->number);
 998                 if (ret)
 999                         return;
1000
1001                 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
1002                                 req->request.length, DWC3_TRBCTL_CONTROL_DATA,
1003                                 false);
1004
1005                 req->trb = &dwc->ep0_trb[dep->trb_enqueue];
1006
1007                 ret = dwc3_ep0_start_trans(dep);
1008         }
1009
1010         WARN_ON(ret < 0);
1011 }
1012
1013 static int dwc3_ep0_start_control_status(struct dwc3_ep *dep)
1014 {
1015         struct dwc3             *dwc = dep->dwc;
1016         u32                     type;
1017
1018         type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3
1019                 : DWC3_TRBCTL_CONTROL_STATUS2;
1020
1021         dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 0, type, false);
1022         return dwc3_ep0_start_trans(dep);
1023 }
1024
1025 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
1026 {
1027         WARN_ON(dwc3_ep0_start_control_status(dep));
1028 }
1029
1030 static void dwc3_ep0_do_control_status(struct dwc3 *dwc,
1031                 const struct dwc3_event_depevt *event)
1032 {
1033         struct dwc3_ep          *dep = dwc->eps[event->endpoint_number];
1034
1035         __dwc3_ep0_do_control_status(dwc, dep);
1036 }
1037
1038 static void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep)
1039 {
1040         struct dwc3_gadget_ep_cmd_params params;
1041         u32                     cmd;
1042         int                     ret;
1043
1044         if (!dep->resource_index)
1045                 return;
1046
1047         cmd = DWC3_DEPCMD_ENDTRANSFER;
1048         cmd |= DWC3_DEPCMD_CMDIOC;
1049         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1050         memset(&params, 0, sizeof(params));
1051         ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
1052         WARN_ON_ONCE(ret);
1053         dep->resource_index = 0;
1054 }
1055
1056 static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
1057                 const struct dwc3_event_depevt *event)
1058 {
1059         switch (event->status) {
1060         case DEPEVT_STATUS_CONTROL_DATA:
1061                 /*
1062                  * We already have a DATA transfer in the controller's cache,
1063                  * if we receive a XferNotReady(DATA) we will ignore it, unless
1064                  * it's for the wrong direction.
1065                  *
1066                  * In that case, we must issue END_TRANSFER command to the Data
1067                  * Phase we already have started and issue SetStall on the
1068                  * control endpoint.
1069                  */
1070                 if (dwc->ep0_expect_in != event->endpoint_number) {
1071                         struct dwc3_ep  *dep = dwc->eps[dwc->ep0_expect_in];
1072
1073                         dev_err(dwc->dev, "unexpected direction for Data Phase\n");
1074                         dwc3_ep0_end_control_data(dwc, dep);
1075                         dwc3_ep0_stall_and_restart(dwc);
1076                         return;
1077                 }
1078
1079                 break;
1080
1081         case DEPEVT_STATUS_CONTROL_STATUS:
1082                 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
1083                         return;
1084
1085                 dwc->ep0state = EP0_STATUS_PHASE;
1086
1087                 if (dwc->delayed_status) {
1088                         struct dwc3_ep *dep = dwc->eps[0];
1089
1090                         WARN_ON_ONCE(event->endpoint_number != 1);
1091                         /*
1092                          * We should handle the delay STATUS phase here if the
1093                          * request for handling delay STATUS has been queued
1094                          * into the list.
1095                          */
1096                         if (!list_empty(&dep->pending_list)) {
1097                                 dwc->delayed_status = false;
1098                                 usb_gadget_set_state(&dwc->gadget,
1099                                                      USB_STATE_CONFIGURED);
1100                                 dwc3_ep0_do_control_status(dwc, event);
1101                         }
1102
1103                         return;
1104                 }
1105
1106                 dwc3_ep0_do_control_status(dwc, event);
1107         }
1108 }
1109
1110 void dwc3_ep0_interrupt(struct dwc3 *dwc,
1111                 const struct dwc3_event_depevt *event)
1112 {
1113         switch (event->endpoint_event) {
1114         case DWC3_DEPEVT_XFERCOMPLETE:
1115                 dwc3_ep0_xfer_complete(dwc, event);
1116                 break;
1117
1118         case DWC3_DEPEVT_XFERNOTREADY:
1119                 dwc3_ep0_xfernotready(dwc, event);
1120                 break;
1121
1122         case DWC3_DEPEVT_XFERINPROGRESS:
1123         case DWC3_DEPEVT_RXTXFIFOEVT:
1124         case DWC3_DEPEVT_STREAMEVT:
1125         case DWC3_DEPEVT_EPCMDCMPLT:
1126                 break;
1127         }
1128 }