drivers/usb/dwc3/ep0.c

   1 /**
   2  * ep0.c - DesignWare USB3 DRD Controller Endpoint 0 Handling
   3  *
   4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Authors: Felipe Balbi <balbi@ti.com>,
   7  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2  of
  11  * the License as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/slab.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/io.h>
  26 #include <linux/list.h>
  27 #include <linux/dma-mapping.h>
  28
  29 #include <linux/usb/ch9.h>
  30 #include <linux/usb/gadget.h>
  31 #include <linux/usb/composite.h>
  32
  33 #include "core.h"
  34 #include "debug.h"
  35 #include "gadget.h"
  36 #include "io.h"
  37
  38 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
  39 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
  40                 struct dwc3_ep *dep, struct dwc3_request *req);
  41
  42 static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma,
  43                 u32 len, u32 type, bool chain)
  44 {
  45         struct dwc3_gadget_ep_cmd_params params;
  46         struct dwc3_trb                 *trb;
  47         struct dwc3_ep                  *dep;
  48
  49         int                             ret;
  50
  51         dep = dwc->eps[epnum];
  52         if (dep->flags & DWC3_EP_BUSY)
  53                 return 0;
  54
  55         trb = &dwc->ep0_trb[dep->trb_enqueue];
  56
  57         if (chain)
  58                 dep->trb_enqueue++;
  59
  60         trb->bpl = lower_32_bits(buf_dma);
  61         trb->bph = upper_32_bits(buf_dma);
  62         trb->size = len;
  63         trb->ctrl = type;
  64
  65         trb->ctrl |= (DWC3_TRB_CTRL_HWO
  66                         | DWC3_TRB_CTRL_ISP_IMI);
  67
  68         if (chain)
  69                 trb->ctrl |= DWC3_TRB_CTRL_CHN;
  70         else
  71                 trb->ctrl |= (DWC3_TRB_CTRL_IOC
  72                                 | DWC3_TRB_CTRL_LST);
  73
  74         if (chain)
  75                 return 0;
  76
  77         memset(&params, 0, sizeof(params));
  78         params.param0 = upper_32_bits(dwc->ep0_trb_addr);
  79         params.param1 = lower_32_bits(dwc->ep0_trb_addr);
  80
  81         trace_dwc3_prepare_trb(dep, trb);
  82
  83         ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_STARTTRANSFER, &params);
  84         if (ret < 0)
  85                 return ret;
  86
  87         dep->flags |= DWC3_EP_BUSY;
  88         dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
  89         dwc->ep0_next_event = DWC3_EP0_COMPLETE;
  90
  91         return 0;
  92 }
  93
  94 static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep,
  95                 struct dwc3_request *req)
  96 {
  97         struct dwc3             *dwc = dep->dwc;
  98
  99         req->request.actual     = 0;
 100         req->request.status     = -EINPROGRESS;
 101         req->epnum              = dep->number;
 102
 103         list_add_tail(&req->list, &dep->pending_list);
 104
 105         /*
 106          * Gadget driver might not be quick enough to queue a request
 107          * before we get a Transfer Not Ready event on this endpoint.
 108          *
 109          * In that case, we will set DWC3_EP_PENDING_REQUEST. When that
 110          * flag is set, it's telling us that as soon as Gadget queues the
 111          * required request, we should kick the transfer here because the
 112          * IRQ we were waiting for is long gone.
 113          */
 114         if (dep->flags & DWC3_EP_PENDING_REQUEST) {
 115                 unsigned        direction;
 116
 117                 direction = !!(dep->flags & DWC3_EP0_DIR_IN);
 118
 119                 if (dwc->ep0state != EP0_DATA_PHASE) {
 120                         dev_WARN(dwc->dev, "Unexpected pending request\n");
 121                         return 0;
 122                 }
 123
 124                 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
 125
 126                 dep->flags &= ~(DWC3_EP_PENDING_REQUEST |
 127                                 DWC3_EP0_DIR_IN);
 128
 129                 return 0;
 130         }
 131
 132         /*
 133          * In case gadget driver asked us to delay the STATUS phase,
 134          * handle it here.
 135          */
 136         if (dwc->delayed_status) {
 137                 unsigned        direction;
 138
 139                 direction = !dwc->ep0_expect_in;
 140                 dwc->delayed_status = false;
 141                 usb_gadget_set_state(&dwc->gadget, USB_STATE_CONFIGURED);
 142
 143                 if (dwc->ep0state == EP0_STATUS_PHASE)
 144                         __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
 145
 146                 return 0;
 147         }
 148
 149         /*
 150          * Unfortunately we have uncovered a limitation wrt the Data Phase.
 151          *
 152          * Section 9.4 says we can wait for the XferNotReady(DATA) event to
 153          * come before issueing Start Transfer command, but if we do, we will
 154          * miss situations where the host starts another SETUP phase instead of
 155          * the DATA phase.  Such cases happen at least on TD.7.6 of the Link
 156          * Layer Compliance Suite.
 157          *
 158          * The problem surfaces due to the fact that in case of back-to-back
 159          * SETUP packets there will be no XferNotReady(DATA) generated and we
 160          * will be stuck waiting for XferNotReady(DATA) forever.
 161          *
 162          * By looking at tables 9-13 and 9-14 of the Databook, we can see that
 163          * it tells us to start Data Phase right away. It also mentions that if
 164          * we receive a SETUP phase instead of the DATA phase, core will issue
 165          * XferComplete for the DATA phase, before actually initiating it in
 166          * the wire, with the TRB's status set to "SETUP_PENDING". Such status
 167          * can only be used to print some debugging logs, as the core expects
 168          * us to go through to the STATUS phase and start a CONTROL_STATUS TRB,
 169          * just so it completes right away, without transferring anything and,
 170          * only then, we can go back to the SETUP phase.
 171          *
 172          * Because of this scenario, SNPS decided to change the programming
 173          * model of control transfers and support on-demand transfers only for
 174          * the STATUS phase. To fix the issue we have now, we will always wait
 175          * for gadget driver to queue the DATA phase's struct usb_request, then
 176          * start it right away.
 177          *
 178          * If we're actually in a 2-stage transfer, we will wait for
 179          * XferNotReady(STATUS).
 180          */
 181         if (dwc->three_stage_setup) {
 182                 unsigned        direction;
 183
 184                 direction = dwc->ep0_expect_in;
 185                 dwc->ep0state = EP0_DATA_PHASE;
 186
 187                 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
 188
 189                 dep->flags &= ~DWC3_EP0_DIR_IN;
 190         }
 191
 192         return 0;
 193 }
 194
 195 int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
 196                 gfp_t gfp_flags)
 197 {
 198         struct dwc3_request             *req = to_dwc3_request(request);
 199         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 200         struct dwc3                     *dwc = dep->dwc;
 201
 202         unsigned long                   flags;
 203
 204         int                             ret;
 205
 206         spin_lock_irqsave(&dwc->lock, flags);
 207         if (!dep->endpoint.desc) {
 208                 dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
 209                                 dep->name);
 210                 ret = -ESHUTDOWN;
 211                 goto out;
 212         }
 213
 214         /* we share one TRB for ep0/1 */
 215         if (!list_empty(&dep->pending_list)) {
 216                 ret = -EBUSY;
 217                 goto out;
 218         }
 219
 220         ret = __dwc3_gadget_ep0_queue(dep, req);
 221
 222 out:
 223         spin_unlock_irqrestore(&dwc->lock, flags);
 224
 225         return ret;
 226 }
 227
 228 static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
 229 {
 230         struct dwc3_ep          *dep;
 231
 232         /* reinitialize physical ep1 */
 233         dep = dwc->eps[1];
 234         dep->flags = DWC3_EP_ENABLED;
 235
 236         /* stall is always issued on EP0 */
 237         dep = dwc->eps[0];
 238         __dwc3_gadget_ep_set_halt(dep, 1, false);
 239         dep->flags = DWC3_EP_ENABLED;
 240         dwc->delayed_status = false;
 241
 242         if (!list_empty(&dep->pending_list)) {
 243                 struct dwc3_request     *req;
 244
 245                 req = next_request(&dep->pending_list);
 246                 dwc3_gadget_giveback(dep, req, -ECONNRESET);
 247         }
 248
 249         dwc->ep0state = EP0_SETUP_PHASE;
 250         dwc3_ep0_out_start(dwc);
 251 }
 252
 253 int __dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
 254 {
 255         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 256         struct dwc3                     *dwc = dep->dwc;
 257
 258         dwc3_ep0_stall_and_restart(dwc);
 259
 260         return 0;
 261 }
 262
 263 int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
 264 {
 265         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 266         struct dwc3                     *dwc = dep->dwc;
 267         unsigned long                   flags;
 268         int                             ret;
 269
 270         spin_lock_irqsave(&dwc->lock, flags);
 271         ret = __dwc3_gadget_ep0_set_halt(ep, value);
 272         spin_unlock_irqrestore(&dwc->lock, flags);
 273
 274         return ret;
 275 }
 276
 277 void dwc3_ep0_out_start(struct dwc3 *dwc)
 278 {
 279         int                             ret;
 280
 281         complete(&dwc->ep0_in_setup);
 282
 283         ret = dwc3_ep0_start_trans(dwc, 0, dwc->ctrl_req_addr, 8,
 284                         DWC3_TRBCTL_CONTROL_SETUP, false);
 285         WARN_ON(ret < 0);
 286 }
 287
 288 static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
 289 {
 290         struct dwc3_ep          *dep;
 291         u32                     windex = le16_to_cpu(wIndex_le);
 292         u32                     epnum;
 293
 294         epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1;
 295         if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
 296                 epnum |= 1;
 297
 298         dep = dwc->eps[epnum];
 299         if (dep->flags & DWC3_EP_ENABLED)
 300                 return dep;
 301
 302         return NULL;
 303 }
 304
 305 static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
 306 {
 307 }
 308 /*
 309  * ch 9.4.5
 310  */
 311 static int dwc3_ep0_handle_status(struct dwc3 *dwc,
 312                 struct usb_ctrlrequest *ctrl)
 313 {
 314         struct dwc3_ep          *dep;
 315         u32                     recip;
 316         u32                     reg;
 317         u16                     usb_status = 0;
 318         __le16                  *response_pkt;
 319
 320         recip = ctrl->bRequestType & USB_RECIP_MASK;
 321         switch (recip) {
 322         case USB_RECIP_DEVICE:
 323                 /*
 324                  * LTM will be set once we know how to set this in HW.
 325                  */
 326                 usb_status |= dwc->gadget.is_selfpowered;
 327
 328                 if ((dwc->speed == DWC3_DSTS_SUPERSPEED) ||
 329                     (dwc->speed == DWC3_DSTS_SUPERSPEED_PLUS)) {
 330                         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 331                         if (reg & DWC3_DCTL_INITU1ENA)
 332                                 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
 333                         if (reg & DWC3_DCTL_INITU2ENA)
 334                                 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
 335                 }
 336
 337                 break;
 338
 339         case USB_RECIP_INTERFACE:
 340                 /*
 341                  * Function Remote Wake Capable D0
 342                  * Function Remote Wakeup       D1
 343                  */
 344                 break;
 345
 346         case USB_RECIP_ENDPOINT:
 347                 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
 348                 if (!dep)
 349                         return -EINVAL;
 350
 351                 if (dep->flags & DWC3_EP_STALL)
 352                         usb_status = 1 << USB_ENDPOINT_HALT;
 353                 break;
 354         default:
 355                 return -EINVAL;
 356         }
 357
 358         response_pkt = (__le16 *) dwc->setup_buf;
 359         *response_pkt = cpu_to_le16(usb_status);
 360
 361         dep = dwc->eps[0];
 362         dwc->ep0_usb_req.dep = dep;
 363         dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
 364         dwc->ep0_usb_req.request.buf = dwc->setup_buf;
 365         dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
 366
 367         return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
 368 }
 369
 370 static int dwc3_ep0_handle_u1(struct dwc3 *dwc, enum usb_device_state state,
 371                 int set)
 372 {
 373         u32 reg;
 374
 375         if (state != USB_STATE_CONFIGURED)
 376                 return -EINVAL;
 377         if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
 378                         (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
 379                 return -EINVAL;
 380
 381         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 382         if (set)
 383                 reg |= DWC3_DCTL_INITU1ENA;
 384         else
 385                 reg &= ~DWC3_DCTL_INITU1ENA;
 386         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 387
 388         return 0;
 389 }
 390
 391 static int dwc3_ep0_handle_u2(struct dwc3 *dwc, enum usb_device_state state,
 392                 int set)
 393 {
 394         u32 reg;
 395
 396
 397         if (state != USB_STATE_CONFIGURED)
 398                 return -EINVAL;
 399         if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
 400                         (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
 401                 return -EINVAL;
 402
 403         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 404         if (set)
 405                 reg |= DWC3_DCTL_INITU2ENA;
 406         else
 407                 reg &= ~DWC3_DCTL_INITU2ENA;
 408         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 409
 410         return 0;
 411 }
 412
 413 static int dwc3_ep0_handle_test(struct dwc3 *dwc, enum usb_device_state state,
 414                 u32 wIndex, int set)
 415 {
 416         if ((wIndex & 0xff) != 0)
 417                 return -EINVAL;
 418         if (!set)
 419                 return -EINVAL;
 420
 421         switch (wIndex >> 8) {
 422         case TEST_J:
 423         case TEST_K:
 424         case TEST_SE0_NAK:
 425         case TEST_PACKET:
 426         case TEST_FORCE_EN:
 427                 dwc->test_mode_nr = wIndex >> 8;
 428                 dwc->test_mode = true;
 429                 break;
 430         default:
 431                 return -EINVAL;
 432         }
 433
 434         return 0;
 435 }
 436
 437 static int dwc3_ep0_handle_device(struct dwc3 *dwc,
 438                 struct usb_ctrlrequest *ctrl, int set)
 439 {
 440         enum usb_device_state   state;
 441         u32                     wValue;
 442         u32                     wIndex;
 443         int                     ret = 0;
 444
 445         wValue = le16_to_cpu(ctrl->wValue);
 446         wIndex = le16_to_cpu(ctrl->wIndex);
 447         state = dwc->gadget.state;
 448
 449         switch (wValue) {
 450         case USB_DEVICE_REMOTE_WAKEUP:
 451                 break;
 452         /*
 453          * 9.4.1 says only only for SS, in AddressState only for
 454          * default control pipe
 455          */
 456         case USB_DEVICE_U1_ENABLE:
 457                 ret = dwc3_ep0_handle_u1(dwc, state, set);
 458                 break;
 459         case USB_DEVICE_U2_ENABLE:
 460                 ret = dwc3_ep0_handle_u2(dwc, state, set);
 461                 break;
 462         case USB_DEVICE_LTM_ENABLE:
 463                 ret = -EINVAL;
 464                 break;
 465         case USB_DEVICE_TEST_MODE:
 466                 ret = dwc3_ep0_handle_test(dwc, state, wIndex, set);
 467                 break;
 468         default:
 469                 ret = -EINVAL;
 470         }
 471
 472         return ret;
 473 }
 474
 475 static int dwc3_ep0_handle_intf(struct dwc3 *dwc,
 476                 struct usb_ctrlrequest *ctrl, int set)
 477 {
 478         enum usb_device_state   state;
 479         u32                     wValue;
 480         u32                     wIndex;
 481         int                     ret = 0;
 482
 483         wValue = le16_to_cpu(ctrl->wValue);
 484         wIndex = le16_to_cpu(ctrl->wIndex);
 485         state = dwc->gadget.state;
 486
 487         switch (wValue) {
 488         case USB_INTRF_FUNC_SUSPEND:
 489                 /*
 490                  * REVISIT: Ideally we would enable some low power mode here,
 491                  * however it's unclear what we should be doing here.
 492                  *
 493                  * For now, we're not doing anything, just making sure we return
 494                  * 0 so USB Command Verifier tests pass without any errors.
 495                  */
 496                 break;
 497         default:
 498                 ret = -EINVAL;
 499         }
 500
 501         return ret;
 502 }
 503
 504 static int dwc3_ep0_handle_endpoint(struct dwc3 *dwc,
 505                 struct usb_ctrlrequest *ctrl, int set)
 506 {
 507         struct dwc3_ep          *dep;
 508         enum usb_device_state   state;
 509         u32                     wValue;
 510         u32                     wIndex;
 511         int                     ret;
 512
 513         wValue = le16_to_cpu(ctrl->wValue);
 514         wIndex = le16_to_cpu(ctrl->wIndex);
 515         state = dwc->gadget.state;
 516
 517         switch (wValue) {
 518         case USB_ENDPOINT_HALT:
 519                 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
 520                 if (!dep)
 521                         return -EINVAL;
 522
 523                 if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
 524                         break;
 525
 526                 ret = __dwc3_gadget_ep_set_halt(dep, set, true);
 527                 if (ret)
 528                         return -EINVAL;
 529                 break;
 530         default:
 531                 return -EINVAL;
 532         }
 533
 534         return 0;
 535 }
 536
 537 static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
 538                 struct usb_ctrlrequest *ctrl, int set)
 539 {
 540         u32                     recip;
 541         int                     ret;
 542         enum usb_device_state   state;
 543
 544         recip = ctrl->bRequestType & USB_RECIP_MASK;
 545         state = dwc->gadget.state;
 546
 547         switch (recip) {
 548         case USB_RECIP_DEVICE:
 549                 ret = dwc3_ep0_handle_device(dwc, ctrl, set);
 550                 break;
 551         case USB_RECIP_INTERFACE:
 552                 ret = dwc3_ep0_handle_intf(dwc, ctrl, set);
 553                 break;
 554         case USB_RECIP_ENDPOINT:
 555                 ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set);
 556                 break;
 557         default:
 558                 ret = -EINVAL;
 559         }
 560
 561         return ret;
 562 }
 563
 564 static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 565 {
 566         enum usb_device_state state = dwc->gadget.state;
 567         u32 addr;
 568         u32 reg;
 569
 570         addr = le16_to_cpu(ctrl->wValue);
 571         if (addr > 127) {
 572                 dev_err(dwc->dev, "invalid device address %d\n", addr);
 573                 return -EINVAL;
 574         }
 575
 576         if (state == USB_STATE_CONFIGURED) {
 577                 dev_err(dwc->dev, "can't SetAddress() from Configured State\n");
 578                 return -EINVAL;
 579         }
 580
 581         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
 582         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
 583         reg |= DWC3_DCFG_DEVADDR(addr);
 584         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
 585
 586         if (addr)
 587                 usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS);
 588         else
 589                 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
 590
 591         return 0;
 592 }
 593
 594 static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 595 {
 596         int ret;
 597
 598         spin_unlock(&dwc->lock);
 599         ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl);
 600         spin_lock(&dwc->lock);
 601         return ret;
 602 }
 603
 604 static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 605 {
 606         enum usb_device_state state = dwc->gadget.state;
 607         u32 cfg;
 608         int ret;
 609         u32 reg;
 610
 611         cfg = le16_to_cpu(ctrl->wValue);
 612
 613         switch (state) {
 614         case USB_STATE_DEFAULT:
 615                 return -EINVAL;
 616
 617         case USB_STATE_ADDRESS:
 618                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 619                 /* if the cfg matches and the cfg is non zero */
 620                 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
 621
 622                         /*
 623                          * only change state if set_config has already
 624                          * been processed. If gadget driver returns
 625                          * USB_GADGET_DELAYED_STATUS, we will wait
 626                          * to change the state on the next usb_ep_queue()
 627                          */
 628                         if (ret == 0)
 629                                 usb_gadget_set_state(&dwc->gadget,
 630                                                 USB_STATE_CONFIGURED);
 631
 632                         /*
 633                          * Enable transition to U1/U2 state when
 634                          * nothing is pending from application.
 635                          */
 636                         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 637                         reg |= (DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA);
 638                         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 639                 }
 640                 break;
 641
 642         case USB_STATE_CONFIGURED:
 643                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 644                 if (!cfg && !ret)
 645                         usb_gadget_set_state(&dwc->gadget,
 646                                         USB_STATE_ADDRESS);
 647                 break;
 648         default:
 649                 ret = -EINVAL;
 650         }
 651         return ret;
 652 }
 653
 654 static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
 655 {
 656         struct dwc3_ep  *dep = to_dwc3_ep(ep);
 657         struct dwc3     *dwc = dep->dwc;
 658
 659         u32             param = 0;
 660         u32             reg;
 661
 662         struct timing {
 663                 u8      u1sel;
 664                 u8      u1pel;
 665                 __le16  u2sel;
 666                 __le16  u2pel;
 667         } __packed timing;
 668
 669         int             ret;
 670
 671         memcpy(&timing, req->buf, sizeof(timing));
 672
 673         dwc->u1sel = timing.u1sel;
 674         dwc->u1pel = timing.u1pel;
 675         dwc->u2sel = le16_to_cpu(timing.u2sel);
 676         dwc->u2pel = le16_to_cpu(timing.u2pel);
 677
 678         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 679         if (reg & DWC3_DCTL_INITU2ENA)
 680                 param = dwc->u2pel;
 681         if (reg & DWC3_DCTL_INITU1ENA)
 682                 param = dwc->u1pel;
 683
 684         /*
 685          * According to Synopsys Databook, if parameter is
 686          * greater than 125, a value of zero should be
 687          * programmed in the register.
 688          */
 689         if (param > 125)
 690                 param = 0;
 691
 692         /* now that we have the time, issue DGCMD Set Sel */
 693         ret = dwc3_send_gadget_generic_command(dwc,
 694                         DWC3_DGCMD_SET_PERIODIC_PAR, param);
 695         WARN_ON(ret < 0);
 696 }
 697
 698 static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 699 {
 700         struct dwc3_ep  *dep;
 701         enum usb_device_state state = dwc->gadget.state;
 702         u16             wLength;
 703         u16             wValue;
 704
 705         if (state == USB_STATE_DEFAULT)
 706                 return -EINVAL;
 707
 708         wValue = le16_to_cpu(ctrl->wValue);
 709         wLength = le16_to_cpu(ctrl->wLength);
 710
 711         if (wLength != 6) {
 712                 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
 713                                 wLength);
 714                 return -EINVAL;
 715         }
 716
 717         /*
 718          * To handle Set SEL we need to receive 6 bytes from Host. So let's
 719          * queue a usb_request for 6 bytes.
 720          *
 721          * Remember, though, this controller can't handle non-wMaxPacketSize
 722          * aligned transfers on the OUT direction, so we queue a request for
 723          * wMaxPacketSize instead.
 724          */
 725         dep = dwc->eps[0];
 726         dwc->ep0_usb_req.dep = dep;
 727         dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
 728         dwc->ep0_usb_req.request.buf = dwc->setup_buf;
 729         dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
 730
 731         return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
 732 }
 733
 734 static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 735 {
 736         u16             wLength;
 737         u16             wValue;
 738         u16             wIndex;
 739
 740         wValue = le16_to_cpu(ctrl->wValue);
 741         wLength = le16_to_cpu(ctrl->wLength);
 742         wIndex = le16_to_cpu(ctrl->wIndex);
 743
 744         if (wIndex || wLength)
 745                 return -EINVAL;
 746
 747         /*
 748          * REVISIT It's unclear from Databook what to do with this
 749          * value. For now, just cache it.
 750          */
 751         dwc->isoch_delay = wValue;
 752
 753         return 0;
 754 }
 755
 756 static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 757 {
 758         int ret;
 759
 760         switch (ctrl->bRequest) {
 761         case USB_REQ_GET_STATUS:
 762                 ret = dwc3_ep0_handle_status(dwc, ctrl);
 763                 break;
 764         case USB_REQ_CLEAR_FEATURE:
 765                 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
 766                 break;
 767         case USB_REQ_SET_FEATURE:
 768                 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
 769                 break;
 770         case USB_REQ_SET_ADDRESS:
 771                 ret = dwc3_ep0_set_address(dwc, ctrl);
 772                 break;
 773         case USB_REQ_SET_CONFIGURATION:
 774                 ret = dwc3_ep0_set_config(dwc, ctrl);
 775                 break;
 776         case USB_REQ_SET_SEL:
 777                 ret = dwc3_ep0_set_sel(dwc, ctrl);
 778                 break;
 779         case USB_REQ_SET_ISOCH_DELAY:
 780                 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
 781                 break;
 782         default:
 783                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 784                 break;
 785         }
 786
 787         return ret;
 788 }
 789
 790 static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
 791                 const struct dwc3_event_depevt *event)
 792 {
 793         struct usb_ctrlrequest *ctrl = dwc->ctrl_req;
 794         int ret = -EINVAL;
 795         u32 len;
 796
 797         if (!dwc->gadget_driver)
 798                 goto out;
 799
 800         trace_dwc3_ctrl_req(ctrl);
 801
 802         len = le16_to_cpu(ctrl->wLength);
 803         if (!len) {
 804                 dwc->three_stage_setup = false;
 805                 dwc->ep0_expect_in = false;
 806                 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
 807         } else {
 808                 dwc->three_stage_setup = true;
 809                 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
 810                 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
 811         }
 812
 813         if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
 814                 ret = dwc3_ep0_std_request(dwc, ctrl);
 815         else
 816                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 817
 818         if (ret == USB_GADGET_DELAYED_STATUS)
 819                 dwc->delayed_status = true;
 820
 821 out:
 822         if (ret < 0)
 823                 dwc3_ep0_stall_and_restart(dwc);
 824 }
 825
 826 static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 827                 const struct dwc3_event_depevt *event)
 828 {
 829         struct dwc3_request     *r = NULL;
 830         struct usb_request      *ur;
 831         struct dwc3_trb         *trb;
 832         struct dwc3_ep          *ep0;
 833         unsigned                transfer_size = 0;
 834         unsigned                maxp;
 835         unsigned                remaining_ur_length;
 836         void                    *buf;
 837         u32                     transferred = 0;
 838         u32                     status;
 839         u32                     length;
 840         u8                      epnum;
 841
 842         epnum = event->endpoint_number;
 843         ep0 = dwc->eps[0];
 844
 845         dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
 846
 847         trb = dwc->ep0_trb;
 848
 849         trace_dwc3_complete_trb(ep0, trb);
 850
 851         r = next_request(&ep0->pending_list);
 852         if (!r)
 853                 return;
 854
 855         status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 856         if (status == DWC3_TRBSTS_SETUP_PENDING) {
 857                 dwc->setup_packet_pending = true;
 858                 if (r)
 859                         dwc3_gadget_giveback(ep0, r, -ECONNRESET);
 860
 861                 return;
 862         }
 863
 864         ur = &r->request;
 865         buf = ur->buf;
 866         remaining_ur_length = ur->length;
 867
 868         length = trb->size & DWC3_TRB_SIZE_MASK;
 869
 870         maxp = ep0->endpoint.maxpacket;
 871
 872         if (dwc->ep0_bounced) {
 873                 /*
 874                  * Handle the first TRB before handling the bounce buffer if
 875                  * the request length is greater than the bounce buffer size
 876                  */
 877                 if (ur->length > DWC3_EP0_BOUNCE_SIZE) {
 878                         transfer_size = ALIGN(ur->length - maxp, maxp);
 879                         transferred = transfer_size - length;
 880                         buf = (u8 *)buf + transferred;
 881                         ur->actual += transferred;
 882                         remaining_ur_length -= transferred;
 883
 884                         trb++;
 885                         length = trb->size & DWC3_TRB_SIZE_MASK;
 886
 887                         ep0->trb_enqueue = 0;
 888                 }
 889
 890                 transfer_size = roundup((ur->length - transfer_size),
 891                                         maxp);
 892
 893                 transferred = min_t(u32, remaining_ur_length,
 894                                     transfer_size - length);
 895                 memcpy(buf, dwc->ep0_bounce, transferred);
 896         } else {
 897                 transferred = ur->length - length;
 898         }
 899
 900         ur->actual += transferred;
 901
 902         if ((epnum & 1) && ur->actual < ur->length) {
 903                 /* for some reason we did not get everything out */
 904
 905                 dwc3_ep0_stall_and_restart(dwc);
 906         } else {
 907                 dwc3_gadget_giveback(ep0, r, 0);
 908
 909                 if (IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) &&
 910                                 ur->length && ur->zero) {
 911                         int ret;
 912
 913                         dwc->ep0_next_event = DWC3_EP0_COMPLETE;
 914
 915                         ret = dwc3_ep0_start_trans(dwc, epnum,
 916                                         dwc->ctrl_req_addr, 0,
 917                                         DWC3_TRBCTL_CONTROL_DATA, false);
 918                         WARN_ON(ret < 0);
 919                 }
 920         }
 921 }
 922
 923 static void dwc3_ep0_complete_status(struct dwc3 *dwc,
 924                 const struct dwc3_event_depevt *event)
 925 {
 926         struct dwc3_request     *r;
 927         struct dwc3_ep          *dep;
 928         struct dwc3_trb         *trb;
 929         u32                     status;
 930
 931         dep = dwc->eps[0];
 932         trb = dwc->ep0_trb;
 933
 934         trace_dwc3_complete_trb(dep, trb);
 935
 936         if (!list_empty(&dep->pending_list)) {
 937                 r = next_request(&dep->pending_list);
 938
 939                 dwc3_gadget_giveback(dep, r, 0);
 940         }
 941
 942         if (dwc->test_mode) {
 943                 int ret;
 944
 945                 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
 946                 if (ret < 0) {
 947                         dev_err(dwc->dev, "invalid test #%d\n",
 948                                         dwc->test_mode_nr);
 949                         dwc3_ep0_stall_and_restart(dwc);
 950                         return;
 951                 }
 952         }
 953
 954         status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 955         if (status == DWC3_TRBSTS_SETUP_PENDING)
 956                 dwc->setup_packet_pending = true;
 957
 958         dwc->ep0state = EP0_SETUP_PHASE;
 959         dwc3_ep0_out_start(dwc);
 960 }
 961
 962 static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
 963                         const struct dwc3_event_depevt *event)
 964 {
 965         struct dwc3_ep          *dep = dwc->eps[event->endpoint_number];
 966
 967         dep->flags &= ~DWC3_EP_BUSY;
 968         dep->resource_index = 0;
 969         dwc->setup_packet_pending = false;
 970
 971         switch (dwc->ep0state) {
 972         case EP0_SETUP_PHASE:
 973                 dwc3_ep0_inspect_setup(dwc, event);
 974                 break;
 975
 976         case EP0_DATA_PHASE:
 977                 dwc3_ep0_complete_data(dwc, event);
 978                 break;
 979
 980         case EP0_STATUS_PHASE:
 981                 dwc3_ep0_complete_status(dwc, event);
 982                 break;
 983         default:
 984                 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
 985         }
 986 }
 987
 988 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
 989                 struct dwc3_ep *dep, struct dwc3_request *req)
 990 {
 991         int                     ret;
 992
 993         req->direction = !!dep->number;
 994
 995         if (req->request.length == 0) {
 996                 ret = dwc3_ep0_start_trans(dwc, dep->number,
 997                                 dwc->ctrl_req_addr, 0,
 998                                 DWC3_TRBCTL_CONTROL_DATA, false);
 999         } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
1000                         && (dep->number == 0)) {
1001                 u32     transfer_size = 0;
1002                 u32     maxpacket;
1003
1004                 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1005                                 &req->request, dep->number);
1006                 if (ret)
1007                         return;
1008
1009                 maxpacket = dep->endpoint.maxpacket;
1010
1011                 if (req->request.length > DWC3_EP0_BOUNCE_SIZE) {
1012                         transfer_size = ALIGN(req->request.length - maxpacket,
1013                                               maxpacket);
1014                         ret = dwc3_ep0_start_trans(dwc, dep->number,
1015                                                    req->request.dma,
1016                                                    transfer_size,
1017                                                    DWC3_TRBCTL_CONTROL_DATA,
1018                                                    true);
1019                 }
1020
1021                 transfer_size = roundup((req->request.length - transfer_size),
1022                                         maxpacket);
1023
1024                 dwc->ep0_bounced = true;
1025
1026                 ret = dwc3_ep0_start_trans(dwc, dep->number,
1027                                 dwc->ep0_bounce_addr, transfer_size,
1028                                 DWC3_TRBCTL_CONTROL_DATA, false);
1029         } else {
1030                 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1031                                 &req->request, dep->number);
1032                 if (ret)
1033                         return;
1034
1035                 ret = dwc3_ep0_start_trans(dwc, dep->number, req->request.dma,
1036                                 req->request.length, DWC3_TRBCTL_CONTROL_DATA,
1037                                 false);
1038         }
1039
1040         WARN_ON(ret < 0);
1041 }
1042
1043 static int dwc3_ep0_start_control_status(struct dwc3_ep *dep)
1044 {
1045         struct dwc3             *dwc = dep->dwc;
1046         u32                     type;
1047
1048         type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3
1049                 : DWC3_TRBCTL_CONTROL_STATUS2;
1050
1051         return dwc3_ep0_start_trans(dwc, dep->number,
1052                         dwc->ctrl_req_addr, 0, type, false);
1053 }
1054
1055 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
1056 {
1057         WARN_ON(dwc3_ep0_start_control_status(dep));
1058 }
1059
1060 static void dwc3_ep0_do_control_status(struct dwc3 *dwc,
1061                 const struct dwc3_event_depevt *event)
1062 {
1063         struct dwc3_ep          *dep = dwc->eps[event->endpoint_number];
1064
1065         __dwc3_ep0_do_control_status(dwc, dep);
1066 }
1067
1068 static void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep)
1069 {
1070         struct dwc3_gadget_ep_cmd_params params;
1071         u32                     cmd;
1072         int                     ret;
1073
1074         if (!dep->resource_index)
1075                 return;
1076
1077         cmd = DWC3_DEPCMD_ENDTRANSFER;
1078         cmd |= DWC3_DEPCMD_CMDIOC;
1079         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1080         memset(&params, 0, sizeof(params));
1081         ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
1082         WARN_ON_ONCE(ret);
1083         dep->resource_index = 0;
1084 }
1085
1086 static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
1087                 const struct dwc3_event_depevt *event)
1088 {
1089         switch (event->status) {
1090         case DEPEVT_STATUS_CONTROL_DATA:
1091                 /*
1092                  * We already have a DATA transfer in the controller's cache,
1093                  * if we receive a XferNotReady(DATA) we will ignore it, unless
1094                  * it's for the wrong direction.
1095                  *
1096                  * In that case, we must issue END_TRANSFER command to the Data
1097                  * Phase we already have started and issue SetStall on the
1098                  * control endpoint.
1099                  */
1100                 if (dwc->ep0_expect_in != event->endpoint_number) {
1101                         struct dwc3_ep  *dep = dwc->eps[dwc->ep0_expect_in];
1102
1103                         dev_err(dwc->dev, "unexpected direction for Data Phase\n");
1104                         dwc3_ep0_end_control_data(dwc, dep);
1105                         dwc3_ep0_stall_and_restart(dwc);
1106                         return;
1107                 }
1108
1109                 break;
1110
1111         case DEPEVT_STATUS_CONTROL_STATUS:
1112                 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
1113                         return;
1114
1115                 dwc->ep0state = EP0_STATUS_PHASE;
1116
1117                 if (dwc->delayed_status) {
1118                         WARN_ON_ONCE(event->endpoint_number != 1);
1119                         return;
1120                 }
1121
1122                 dwc3_ep0_do_control_status(dwc, event);
1123         }
1124 }
1125
1126 void dwc3_ep0_interrupt(struct dwc3 *dwc,
1127                 const struct dwc3_event_depevt *event)
1128 {
1129         switch (event->endpoint_event) {
1130         case DWC3_DEPEVT_XFERCOMPLETE:
1131                 dwc3_ep0_xfer_complete(dwc, event);
1132                 break;
1133
1134         case DWC3_DEPEVT_XFERNOTREADY:
1135                 dwc3_ep0_xfernotready(dwc, event);
1136                 break;
1137
1138         case DWC3_DEPEVT_XFERINPROGRESS:
1139         case DWC3_DEPEVT_RXTXFIFOEVT:
1140         case DWC3_DEPEVT_STREAMEVT:
1141         case DWC3_DEPEVT_EPCMDCMPLT:
1142                 break;
1143         }
1144 }