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 <[email protected]>,
   7  *          Sebastian Andrzej Siewior <[email protected]>
   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 void dwc3_ep0_prepare_one_trb(struct dwc3 *dwc, u8 epnum,
  43                 dma_addr_t buf_dma, u32 len, u32 type, bool chain)
  44 {
  45         struct dwc3_trb                 *trb;
  46         struct dwc3_ep                  *dep;
  47
  48         dep = dwc->eps[epnum];
  49
  50         trb = &dwc->ep0_trb[dep->trb_enqueue];
  51
  52         if (chain)
  53                 dep->trb_enqueue++;
  54
  55         trb->bpl = lower_32_bits(buf_dma);
  56         trb->bph = upper_32_bits(buf_dma);
  57         trb->size = len;
  58         trb->ctrl = type;
  59
  60         trb->ctrl |= (DWC3_TRB_CTRL_HWO
  61                         | DWC3_TRB_CTRL_ISP_IMI);
  62
  63         if (chain)
  64                 trb->ctrl |= DWC3_TRB_CTRL_CHN;
  65         else
  66                 trb->ctrl |= (DWC3_TRB_CTRL_IOC
  67                                 | DWC3_TRB_CTRL_LST);
  68
  69         trace_dwc3_prepare_trb(dep, trb);
  70 }
  71
  72 static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum)
  73 {
  74         struct dwc3_gadget_ep_cmd_params params;
  75         struct dwc3_ep                  *dep;
  76         int                             ret;
  77
  78         dep = dwc->eps[epnum];
  79         if (dep->flags & DWC3_EP_BUSY)
  80                 return 0;
  81
  82         memset(&params, 0, sizeof(params));
  83         params.param0 = upper_32_bits(dwc->ep0_trb_addr);
  84         params.param1 = lower_32_bits(dwc->ep0_trb_addr);
  85
  86         ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_STARTTRANSFER, &params);
  87         if (ret < 0)
  88                 return ret;
  89
  90         dep->flags |= DWC3_EP_BUSY;
  91         dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
  92         dwc->ep0_next_event = DWC3_EP0_COMPLETE;
  93
  94         return 0;
  95 }
  96
  97 static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep,
  98                 struct dwc3_request *req)
  99 {
 100         struct dwc3             *dwc = dep->dwc;
 101
 102         req->request.actual     = 0;
 103         req->request.status     = -EINPROGRESS;
 104         req->epnum              = dep->number;
 105
 106         list_add_tail(&req->list, &dep->pending_list);
 107
 108         /*
 109          * Gadget driver might not be quick enough to queue a request
 110          * before we get a Transfer Not Ready event on this endpoint.
 111          *
 112          * In that case, we will set DWC3_EP_PENDING_REQUEST. When that
 113          * flag is set, it's telling us that as soon as Gadget queues the
 114          * required request, we should kick the transfer here because the
 115          * IRQ we were waiting for is long gone.
 116          */
 117         if (dep->flags & DWC3_EP_PENDING_REQUEST) {
 118                 unsigned        direction;
 119
 120                 direction = !!(dep->flags & DWC3_EP0_DIR_IN);
 121
 122                 if (dwc->ep0state != EP0_DATA_PHASE) {
 123                         dev_WARN(dwc->dev, "Unexpected pending request\n");
 124                         return 0;
 125                 }
 126
 127                 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
 128
 129                 dep->flags &= ~(DWC3_EP_PENDING_REQUEST |
 130                                 DWC3_EP0_DIR_IN);
 131
 132                 return 0;
 133         }
 134
 135         /*
 136          * In case gadget driver asked us to delay the STATUS phase,
 137          * handle it here.
 138          */
 139         if (dwc->delayed_status) {
 140                 unsigned        direction;
 141
 142                 direction = !dwc->ep0_expect_in;
 143                 dwc->delayed_status = false;
 144                 usb_gadget_set_state(&dwc->gadget, USB_STATE_CONFIGURED);
 145
 146                 if (dwc->ep0state == EP0_STATUS_PHASE)
 147                         __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
 148
 149                 return 0;
 150         }
 151
 152         /*
 153          * Unfortunately we have uncovered a limitation wrt the Data Phase.
 154          *
 155          * Section 9.4 says we can wait for the XferNotReady(DATA) event to
 156          * come before issueing Start Transfer command, but if we do, we will
 157          * miss situations where the host starts another SETUP phase instead of
 158          * the DATA phase.  Such cases happen at least on TD.7.6 of the Link
 159          * Layer Compliance Suite.
 160          *
 161          * The problem surfaces due to the fact that in case of back-to-back
 162          * SETUP packets there will be no XferNotReady(DATA) generated and we
 163          * will be stuck waiting for XferNotReady(DATA) forever.
 164          *
 165          * By looking at tables 9-13 and 9-14 of the Databook, we can see that
 166          * it tells us to start Data Phase right away. It also mentions that if
 167          * we receive a SETUP phase instead of the DATA phase, core will issue
 168          * XferComplete for the DATA phase, before actually initiating it in
 169          * the wire, with the TRB's status set to "SETUP_PENDING". Such status
 170          * can only be used to print some debugging logs, as the core expects
 171          * us to go through to the STATUS phase and start a CONTROL_STATUS TRB,
 172          * just so it completes right away, without transferring anything and,
 173          * only then, we can go back to the SETUP phase.
 174          *
 175          * Because of this scenario, SNPS decided to change the programming
 176          * model of control transfers and support on-demand transfers only for
 177          * the STATUS phase. To fix the issue we have now, we will always wait
 178          * for gadget driver to queue the DATA phase's struct usb_request, then
 179          * start it right away.
 180          *
 181          * If we're actually in a 2-stage transfer, we will wait for
 182          * XferNotReady(STATUS).
 183          */
 184         if (dwc->three_stage_setup) {
 185                 unsigned        direction;
 186
 187                 direction = dwc->ep0_expect_in;
 188                 dwc->ep0state = EP0_DATA_PHASE;
 189
 190                 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
 191
 192                 dep->flags &= ~DWC3_EP0_DIR_IN;
 193         }
 194
 195         return 0;
 196 }
 197
 198 int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
 199                 gfp_t gfp_flags)
 200 {
 201         struct dwc3_request             *req = to_dwc3_request(request);
 202         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 203         struct dwc3                     *dwc = dep->dwc;
 204
 205         unsigned long                   flags;
 206
 207         int                             ret;
 208
 209         spin_lock_irqsave(&dwc->lock, flags);
 210         if (!dep->endpoint.desc) {
 211                 dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
 212                                 dep->name);
 213                 ret = -ESHUTDOWN;
 214                 goto out;
 215         }
 216
 217         /* we share one TRB for ep0/1 */
 218         if (!list_empty(&dep->pending_list)) {
 219                 ret = -EBUSY;
 220                 goto out;
 221         }
 222
 223         ret = __dwc3_gadget_ep0_queue(dep, req);
 224
 225 out:
 226         spin_unlock_irqrestore(&dwc->lock, flags);
 227
 228         return ret;
 229 }
 230
 231 static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
 232 {
 233         struct dwc3_ep          *dep;
 234
 235         /* reinitialize physical ep1 */
 236         dep = dwc->eps[1];
 237         dep->flags = DWC3_EP_ENABLED;
 238
 239         /* stall is always issued on EP0 */
 240         dep = dwc->eps[0];
 241         __dwc3_gadget_ep_set_halt(dep, 1, false);
 242         dep->flags = DWC3_EP_ENABLED;
 243         dwc->delayed_status = false;
 244
 245         if (!list_empty(&dep->pending_list)) {
 246                 struct dwc3_request     *req;
 247
 248                 req = next_request(&dep->pending_list);
 249                 dwc3_gadget_giveback(dep, req, -ECONNRESET);
 250         }
 251
 252         dwc->ep0state = EP0_SETUP_PHASE;
 253         dwc3_ep0_out_start(dwc);
 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
 261         dwc3_ep0_stall_and_restart(dwc);
 262
 263         return 0;
 264 }
 265
 266 int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
 267 {
 268         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 269         struct dwc3                     *dwc = dep->dwc;
 270         unsigned long                   flags;
 271         int                             ret;
 272
 273         spin_lock_irqsave(&dwc->lock, flags);
 274         ret = __dwc3_gadget_ep0_set_halt(ep, value);
 275         spin_unlock_irqrestore(&dwc->lock, flags);
 276
 277         return ret;
 278 }
 279
 280 void dwc3_ep0_out_start(struct dwc3 *dwc)
 281 {
 282         int                             ret;
 283
 284         complete(&dwc->ep0_in_setup);
 285
 286         dwc3_ep0_prepare_one_trb(dwc, 0, dwc->ctrl_req_addr, 8,
 287                         DWC3_TRBCTL_CONTROL_SETUP, false);
 288         ret = dwc3_ep0_start_trans(dwc, 0);
 289         WARN_ON(ret < 0);
 290 }
 291
 292 static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
 293 {
 294         struct dwc3_ep          *dep;
 295         u32                     windex = le16_to_cpu(wIndex_le);
 296         u32                     epnum;
 297
 298         epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1;
 299         if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
 300                 epnum |= 1;
 301
 302         dep = dwc->eps[epnum];
 303         if (dep->flags & DWC3_EP_ENABLED)
 304                 return dep;
 305
 306         return NULL;
 307 }
 308
 309 static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
 310 {
 311 }
 312 /*
 313  * ch 9.4.5
 314  */
 315 static int dwc3_ep0_handle_status(struct dwc3 *dwc,
 316                 struct usb_ctrlrequest *ctrl)
 317 {
 318         struct dwc3_ep          *dep;
 319         u32                     recip;
 320         u32                     reg;
 321         u16                     usb_status = 0;
 322         __le16                  *response_pkt;
 323
 324         recip = ctrl->bRequestType & USB_RECIP_MASK;
 325         switch (recip) {
 326         case USB_RECIP_DEVICE:
 327                 /*
 328                  * LTM will be set once we know how to set this in HW.
 329                  */
 330                 usb_status |= dwc->gadget.is_selfpowered;
 331
 332                 if ((dwc->speed == DWC3_DSTS_SUPERSPEED) ||
 333                     (dwc->speed == DWC3_DSTS_SUPERSPEED_PLUS)) {
 334                         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 335                         if (reg & DWC3_DCTL_INITU1ENA)
 336                                 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
 337                         if (reg & DWC3_DCTL_INITU2ENA)
 338                                 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
 339                 }
 340
 341                 break;
 342
 343         case USB_RECIP_INTERFACE:
 344                 /*
 345                  * Function Remote Wake Capable D0
 346                  * Function Remote Wakeup       D1
 347                  */
 348                 break;
 349
 350         case USB_RECIP_ENDPOINT:
 351                 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
 352                 if (!dep)
 353                         return -EINVAL;
 354
 355                 if (dep->flags & DWC3_EP_STALL)
 356                         usb_status = 1 << USB_ENDPOINT_HALT;
 357                 break;
 358         default:
 359                 return -EINVAL;
 360         }
 361
 362         response_pkt = (__le16 *) dwc->setup_buf;
 363         *response_pkt = cpu_to_le16(usb_status);
 364
 365         dep = dwc->eps[0];
 366         dwc->ep0_usb_req.dep = dep;
 367         dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
 368         dwc->ep0_usb_req.request.buf = dwc->setup_buf;
 369         dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
 370
 371         return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
 372 }
 373
 374 static int dwc3_ep0_handle_u1(struct dwc3 *dwc, enum usb_device_state state,
 375                 int set)
 376 {
 377         u32 reg;
 378
 379         if (state != USB_STATE_CONFIGURED)
 380                 return -EINVAL;
 381         if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
 382                         (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
 383                 return -EINVAL;
 384
 385         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 386         if (set)
 387                 reg |= DWC3_DCTL_INITU1ENA;
 388         else
 389                 reg &= ~DWC3_DCTL_INITU1ENA;
 390         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 391
 392         return 0;
 393 }
 394
 395 static int dwc3_ep0_handle_u2(struct dwc3 *dwc, enum usb_device_state state,
 396                 int set)
 397 {
 398         u32 reg;
 399
 400
 401         if (state != USB_STATE_CONFIGURED)
 402                 return -EINVAL;
 403         if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
 404                         (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
 405                 return -EINVAL;
 406
 407         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 408         if (set)
 409                 reg |= DWC3_DCTL_INITU2ENA;
 410         else
 411                 reg &= ~DWC3_DCTL_INITU2ENA;
 412         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 413
 414         return 0;
 415 }
 416
 417 static int dwc3_ep0_handle_test(struct dwc3 *dwc, enum usb_device_state state,
 418                 u32 wIndex, int set)
 419 {
 420         if ((wIndex & 0xff) != 0)
 421                 return -EINVAL;
 422         if (!set)
 423                 return -EINVAL;
 424
 425         switch (wIndex >> 8) {
 426         case TEST_J:
 427         case TEST_K:
 428         case TEST_SE0_NAK:
 429         case TEST_PACKET:
 430         case TEST_FORCE_EN:
 431                 dwc->test_mode_nr = wIndex >> 8;
 432                 dwc->test_mode = true;
 433                 break;
 434         default:
 435                 return -EINVAL;
 436         }
 437
 438         return 0;
 439 }
 440
 441 static int dwc3_ep0_handle_device(struct dwc3 *dwc,
 442                 struct usb_ctrlrequest *ctrl, int set)
 443 {
 444         enum usb_device_state   state;
 445         u32                     wValue;
 446         u32                     wIndex;
 447         int                     ret = 0;
 448
 449         wValue = le16_to_cpu(ctrl->wValue);
 450         wIndex = le16_to_cpu(ctrl->wIndex);
 451         state = dwc->gadget.state;
 452
 453         switch (wValue) {
 454         case USB_DEVICE_REMOTE_WAKEUP:
 455                 break;
 456         /*
 457          * 9.4.1 says only only for SS, in AddressState only for
 458          * default control pipe
 459          */
 460         case USB_DEVICE_U1_ENABLE:
 461                 ret = dwc3_ep0_handle_u1(dwc, state, set);
 462                 break;
 463         case USB_DEVICE_U2_ENABLE:
 464                 ret = dwc3_ep0_handle_u2(dwc, state, set);
 465                 break;
 466         case USB_DEVICE_LTM_ENABLE:
 467                 ret = -EINVAL;
 468                 break;
 469         case USB_DEVICE_TEST_MODE:
 470                 ret = dwc3_ep0_handle_test(dwc, state, wIndex, set);
 471                 break;
 472         default:
 473                 ret = -EINVAL;
 474         }
 475
 476         return ret;
 477 }
 478
 479 static int dwc3_ep0_handle_intf(struct dwc3 *dwc,
 480                 struct usb_ctrlrequest *ctrl, int set)
 481 {
 482         enum usb_device_state   state;
 483         u32                     wValue;
 484         u32                     wIndex;
 485         int                     ret = 0;
 486
 487         wValue = le16_to_cpu(ctrl->wValue);
 488         wIndex = le16_to_cpu(ctrl->wIndex);
 489         state = dwc->gadget.state;
 490
 491         switch (wValue) {
 492         case USB_INTRF_FUNC_SUSPEND:
 493                 /*
 494                  * REVISIT: Ideally we would enable some low power mode here,
 495                  * however it's unclear what we should be doing here.
 496                  *
 497                  * For now, we're not doing anything, just making sure we return
 498                  * 0 so USB Command Verifier tests pass without any errors.
 499                  */
 500                 break;
 501         default:
 502                 ret = -EINVAL;
 503         }
 504
 505         return ret;
 506 }
 507
 508 static int dwc3_ep0_handle_endpoint(struct dwc3 *dwc,
 509                 struct usb_ctrlrequest *ctrl, int set)
 510 {
 511         struct dwc3_ep          *dep;
 512         enum usb_device_state   state;
 513         u32                     wValue;
 514         u32                     wIndex;
 515         int                     ret;
 516
 517         wValue = le16_to_cpu(ctrl->wValue);
 518         wIndex = le16_to_cpu(ctrl->wIndex);
 519         state = dwc->gadget.state;
 520
 521         switch (wValue) {
 522         case USB_ENDPOINT_HALT:
 523                 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
 524                 if (!dep)
 525                         return -EINVAL;
 526
 527                 if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
 528                         break;
 529
 530                 ret = __dwc3_gadget_ep_set_halt(dep, set, true);
 531                 if (ret)
 532                         return -EINVAL;
 533                 break;
 534         default:
 535                 return -EINVAL;
 536         }
 537
 538         return 0;
 539 }
 540
 541 static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
 542                 struct usb_ctrlrequest *ctrl, int set)
 543 {
 544         u32                     recip;
 545         int                     ret;
 546         enum usb_device_state   state;
 547
 548         recip = ctrl->bRequestType & USB_RECIP_MASK;
 549         state = dwc->gadget.state;
 550
 551         switch (recip) {
 552         case USB_RECIP_DEVICE:
 553                 ret = dwc3_ep0_handle_device(dwc, ctrl, set);
 554                 break;
 555         case USB_RECIP_INTERFACE:
 556                 ret = dwc3_ep0_handle_intf(dwc, ctrl, set);
 557                 break;
 558         case USB_RECIP_ENDPOINT:
 559                 ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set);
 560                 break;
 561         default:
 562                 ret = -EINVAL;
 563         }
 564
 565         return ret;
 566 }
 567
 568 static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 569 {
 570         enum usb_device_state state = dwc->gadget.state;
 571         u32 addr;
 572         u32 reg;
 573
 574         addr = le16_to_cpu(ctrl->wValue);
 575         if (addr > 127) {
 576                 dev_err(dwc->dev, "invalid device address %d\n", addr);
 577                 return -EINVAL;
 578         }
 579
 580         if (state == USB_STATE_CONFIGURED) {
 581                 dev_err(dwc->dev, "can't SetAddress() from Configured State\n");
 582                 return -EINVAL;
 583         }
 584
 585         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
 586         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
 587         reg |= DWC3_DCFG_DEVADDR(addr);
 588         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
 589
 590         if (addr)
 591                 usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS);
 592         else
 593                 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
 594
 595         return 0;
 596 }
 597
 598 static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 599 {
 600         int ret;
 601
 602         spin_unlock(&dwc->lock);
 603         ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl);
 604         spin_lock(&dwc->lock);
 605         return ret;
 606 }
 607
 608 static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 609 {
 610         enum usb_device_state state = dwc->gadget.state;
 611         u32 cfg;
 612         int ret;
 613         u32 reg;
 614
 615         cfg = le16_to_cpu(ctrl->wValue);
 616
 617         switch (state) {
 618         case USB_STATE_DEFAULT:
 619                 return -EINVAL;
 620
 621         case USB_STATE_ADDRESS:
 622                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 623                 /* if the cfg matches and the cfg is non zero */
 624                 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
 625
 626                         /*
 627                          * only change state if set_config has already
 628                          * been processed. If gadget driver returns
 629                          * USB_GADGET_DELAYED_STATUS, we will wait
 630                          * to change the state on the next usb_ep_queue()
 631                          */
 632                         if (ret == 0)
 633                                 usb_gadget_set_state(&dwc->gadget,
 634                                                 USB_STATE_CONFIGURED);
 635
 636                         /*
 637                          * Enable transition to U1/U2 state when
 638                          * nothing is pending from application.
 639                          */
 640                         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 641                         reg |= (DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA);
 642                         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 643                 }
 644                 break;
 645
 646         case USB_STATE_CONFIGURED:
 647                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 648                 if (!cfg && !ret)
 649                         usb_gadget_set_state(&dwc->gadget,
 650                                         USB_STATE_ADDRESS);
 651                 break;
 652         default:
 653                 ret = -EINVAL;
 654         }
 655         return ret;
 656 }
 657
 658 static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
 659 {
 660         struct dwc3_ep  *dep = to_dwc3_ep(ep);
 661         struct dwc3     *dwc = dep->dwc;
 662
 663         u32             param = 0;
 664         u32             reg;
 665
 666         struct timing {
 667                 u8      u1sel;
 668                 u8      u1pel;
 669                 __le16  u2sel;
 670                 __le16  u2pel;
 671         } __packed timing;
 672
 673         int             ret;
 674
 675         memcpy(&timing, req->buf, sizeof(timing));
 676
 677         dwc->u1sel = timing.u1sel;
 678         dwc->u1pel = timing.u1pel;
 679         dwc->u2sel = le16_to_cpu(timing.u2sel);
 680         dwc->u2pel = le16_to_cpu(timing.u2pel);
 681
 682         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 683         if (reg & DWC3_DCTL_INITU2ENA)
 684                 param = dwc->u2pel;
 685         if (reg & DWC3_DCTL_INITU1ENA)
 686                 param = dwc->u1pel;
 687
 688         /*
 689          * According to Synopsys Databook, if parameter is
 690          * greater than 125, a value of zero should be
 691          * programmed in the register.
 692          */
 693         if (param > 125)
 694                 param = 0;
 695
 696         /* now that we have the time, issue DGCMD Set Sel */
 697         ret = dwc3_send_gadget_generic_command(dwc,
 698                         DWC3_DGCMD_SET_PERIODIC_PAR, param);
 699         WARN_ON(ret < 0);
 700 }
 701
 702 static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 703 {
 704         struct dwc3_ep  *dep;
 705         enum usb_device_state state = dwc->gadget.state;
 706         u16             wLength;
 707         u16             wValue;
 708
 709         if (state == USB_STATE_DEFAULT)
 710                 return -EINVAL;
 711
 712         wValue = le16_to_cpu(ctrl->wValue);
 713         wLength = le16_to_cpu(ctrl->wLength);
 714
 715         if (wLength != 6) {
 716                 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
 717                                 wLength);
 718                 return -EINVAL;
 719         }
 720
 721         /*
 722          * To handle Set SEL we need to receive 6 bytes from Host. So let's
 723          * queue a usb_request for 6 bytes.
 724          *
 725          * Remember, though, this controller can't handle non-wMaxPacketSize
 726          * aligned transfers on the OUT direction, so we queue a request for
 727          * wMaxPacketSize instead.
 728          */
 729         dep = dwc->eps[0];
 730         dwc->ep0_usb_req.dep = dep;
 731         dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
 732         dwc->ep0_usb_req.request.buf = dwc->setup_buf;
 733         dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
 734
 735         return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
 736 }
 737
 738 static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 739 {
 740         u16             wLength;
 741         u16             wValue;
 742         u16             wIndex;
 743
 744         wValue = le16_to_cpu(ctrl->wValue);
 745         wLength = le16_to_cpu(ctrl->wLength);
 746         wIndex = le16_to_cpu(ctrl->wIndex);
 747
 748         if (wIndex || wLength)
 749                 return -EINVAL;
 750
 751         /*
 752          * REVISIT It's unclear from Databook what to do with this
 753          * value. For now, just cache it.
 754          */
 755         dwc->isoch_delay = wValue;
 756
 757         return 0;
 758 }
 759
 760 static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 761 {
 762         int ret;
 763
 764         switch (ctrl->bRequest) {
 765         case USB_REQ_GET_STATUS:
 766                 ret = dwc3_ep0_handle_status(dwc, ctrl);
 767                 break;
 768         case USB_REQ_CLEAR_FEATURE:
 769                 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
 770                 break;
 771         case USB_REQ_SET_FEATURE:
 772                 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
 773                 break;
 774         case USB_REQ_SET_ADDRESS:
 775                 ret = dwc3_ep0_set_address(dwc, ctrl);
 776                 break;
 777         case USB_REQ_SET_CONFIGURATION:
 778                 ret = dwc3_ep0_set_config(dwc, ctrl);
 779                 break;
 780         case USB_REQ_SET_SEL:
 781                 ret = dwc3_ep0_set_sel(dwc, ctrl);
 782                 break;
 783         case USB_REQ_SET_ISOCH_DELAY:
 784                 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
 785                 break;
 786         default:
 787                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 788                 break;
 789         }
 790
 791         return ret;
 792 }
 793
 794 static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
 795                 const struct dwc3_event_depevt *event)
 796 {
 797         struct usb_ctrlrequest *ctrl = dwc->ctrl_req;
 798         int ret = -EINVAL;
 799         u32 len;
 800
 801         if (!dwc->gadget_driver)
 802                 goto out;
 803
 804         trace_dwc3_ctrl_req(ctrl);
 805
 806         len = le16_to_cpu(ctrl->wLength);
 807         if (!len) {
 808                 dwc->three_stage_setup = false;
 809                 dwc->ep0_expect_in = false;
 810                 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
 811         } else {
 812                 dwc->three_stage_setup = true;
 813                 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
 814                 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
 815         }
 816
 817         if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
 818                 ret = dwc3_ep0_std_request(dwc, ctrl);
 819         else
 820                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 821
 822         if (ret == USB_GADGET_DELAYED_STATUS)
 823                 dwc->delayed_status = true;
 824
 825 out:
 826         if (ret < 0)
 827                 dwc3_ep0_stall_and_restart(dwc);
 828 }
 829
 830 static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 831                 const struct dwc3_event_depevt *event)
 832 {
 833         struct dwc3_request     *r = NULL;
 834         struct usb_request      *ur;
 835         struct dwc3_trb         *trb;
 836         struct dwc3_ep          *ep0;
 837         unsigned                transfer_size = 0;
 838         unsigned                maxp;
 839         unsigned                remaining_ur_length;
 840         void                    *buf;
 841         u32                     transferred = 0;
 842         u32                     status;
 843         u32                     length;
 844         u8                      epnum;
 845
 846         epnum = event->endpoint_number;
 847         ep0 = dwc->eps[0];
 848
 849         dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
 850
 851         trb = dwc->ep0_trb;
 852
 853         trace_dwc3_complete_trb(ep0, trb);
 854
 855         r = next_request(&ep0->pending_list);
 856         if (!r)
 857                 return;
 858
 859         status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 860         if (status == DWC3_TRBSTS_SETUP_PENDING) {
 861                 dwc->setup_packet_pending = true;
 862                 if (r)
 863                         dwc3_gadget_giveback(ep0, r, -ECONNRESET);
 864
 865                 return;
 866         }
 867
 868         ur = &r->request;
 869         buf = ur->buf;
 870         remaining_ur_length = ur->length;
 871
 872         length = trb->size & DWC3_TRB_SIZE_MASK;
 873
 874         maxp = ep0->endpoint.maxpacket;
 875
 876         if (dwc->ep0_bounced) {
 877                 /*
 878                  * Handle the first TRB before handling the bounce buffer if
 879                  * the request length is greater than the bounce buffer size
 880                  */
 881                 if (ur->length > DWC3_EP0_BOUNCE_SIZE) {
 882                         transfer_size = ALIGN(ur->length - maxp, maxp);
 883                         transferred = transfer_size - length;
 884                         buf = (u8 *)buf + transferred;
 885                         ur->actual += transferred;
 886                         remaining_ur_length -= transferred;
 887
 888                         trb++;
 889                         length = trb->size & DWC3_TRB_SIZE_MASK;
 890
 891                         ep0->trb_enqueue = 0;
 892                 }
 893
 894                 transfer_size = roundup((ur->length - transfer_size),
 895                                         maxp);
 896
 897                 transferred = min_t(u32, remaining_ur_length,
 898                                     transfer_size - length);
 899                 memcpy(buf, dwc->ep0_bounce, transferred);
 900         } else {
 901                 transferred = ur->length - length;
 902         }
 903
 904         ur->actual += transferred;
 905
 906         if ((epnum & 1) && ur->actual < ur->length) {
 907                 /* for some reason we did not get everything out */
 908
 909                 dwc3_ep0_stall_and_restart(dwc);
 910         } else {
 911                 dwc3_gadget_giveback(ep0, r, 0);
 912
 913                 if (IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) &&
 914                                 ur->length && ur->zero) {
 915                         int ret;
 916
 917                         dwc->ep0_next_event = DWC3_EP0_COMPLETE;
 918
 919                         dwc3_ep0_prepare_one_trb(dwc, epnum, dwc->ctrl_req_addr,
 920                                         0, DWC3_TRBCTL_CONTROL_DATA, false);
 921                         ret = dwc3_ep0_start_trans(dwc, epnum);
 922                         WARN_ON(ret < 0);
 923                 }
 924         }
 925 }
 926
 927 static void dwc3_ep0_complete_status(struct dwc3 *dwc,
 928                 const struct dwc3_event_depevt *event)
 929 {
 930         struct dwc3_request     *r;
 931         struct dwc3_ep          *dep;
 932         struct dwc3_trb         *trb;
 933         u32                     status;
 934
 935         dep = dwc->eps[0];
 936         trb = dwc->ep0_trb;
 937
 938         trace_dwc3_complete_trb(dep, trb);
 939
 940         if (!list_empty(&dep->pending_list)) {
 941                 r = next_request(&dep->pending_list);
 942
 943                 dwc3_gadget_giveback(dep, r, 0);
 944         }
 945
 946         if (dwc->test_mode) {
 947                 int ret;
 948
 949                 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
 950                 if (ret < 0) {
 951                         dev_err(dwc->dev, "invalid test #%d\n",
 952                                         dwc->test_mode_nr);
 953                         dwc3_ep0_stall_and_restart(dwc);
 954                         return;
 955                 }
 956         }
 957
 958         status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 959         if (status == DWC3_TRBSTS_SETUP_PENDING)
 960                 dwc->setup_packet_pending = true;
 961
 962         dwc->ep0state = EP0_SETUP_PHASE;
 963         dwc3_ep0_out_start(dwc);
 964 }
 965
 966 static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
 967                         const struct dwc3_event_depevt *event)
 968 {
 969         struct dwc3_ep          *dep = dwc->eps[event->endpoint_number];
 970
 971         dep->flags &= ~DWC3_EP_BUSY;
 972         dep->resource_index = 0;
 973         dwc->setup_packet_pending = false;
 974
 975         switch (dwc->ep0state) {
 976         case EP0_SETUP_PHASE:
 977                 dwc3_ep0_inspect_setup(dwc, event);
 978                 break;
 979
 980         case EP0_DATA_PHASE:
 981                 dwc3_ep0_complete_data(dwc, event);
 982                 break;
 983
 984         case EP0_STATUS_PHASE:
 985                 dwc3_ep0_complete_status(dwc, event);
 986                 break;
 987         default:
 988                 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
 989         }
 990 }
 991
 992 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
 993                 struct dwc3_ep *dep, struct dwc3_request *req)
 994 {
 995         int                     ret;
 996
 997         req->direction = !!dep->number;
 998
 999         if (req->request.length == 0) {
1000                 dwc3_ep0_prepare_one_trb(dwc, dep->number,
1001                                 dwc->ctrl_req_addr, 0,
1002                                 DWC3_TRBCTL_CONTROL_DATA, false);
1003                 ret = dwc3_ep0_start_trans(dwc, dep->number);
1004         } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
1005                         && (dep->number == 0)) {
1006                 u32     transfer_size = 0;
1007                 u32     maxpacket;
1008
1009                 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1010                                 &req->request, dep->number);
1011                 if (ret)
1012                         return;
1013
1014                 maxpacket = dep->endpoint.maxpacket;
1015
1016                 if (req->request.length > DWC3_EP0_BOUNCE_SIZE) {
1017                         transfer_size = ALIGN(req->request.length - maxpacket,
1018                                               maxpacket);
1019                         dwc3_ep0_prepare_one_trb(dwc, dep->number,
1020                                                    req->request.dma,
1021                                                    transfer_size,
1022                                                    DWC3_TRBCTL_CONTROL_DATA,
1023                                                    true);
1024                 }
1025
1026                 transfer_size = roundup((req->request.length - transfer_size),
1027                                         maxpacket);
1028
1029                 dwc->ep0_bounced = true;
1030
1031                 dwc3_ep0_prepare_one_trb(dwc, dep->number,
1032                                 dwc->ep0_bounce_addr, transfer_size,
1033                                 DWC3_TRBCTL_CONTROL_DATA, false);
1034                 ret = dwc3_ep0_start_trans(dwc, dep->number);
1035         } else {
1036                 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1037                                 &req->request, dep->number);
1038                 if (ret)
1039                         return;
1040
1041                 dwc3_ep0_prepare_one_trb(dwc, dep->number, req->request.dma,
1042                                 req->request.length, DWC3_TRBCTL_CONTROL_DATA,
1043                                 false);
1044                 ret = dwc3_ep0_start_trans(dwc, dep->number);
1045         }
1046
1047         WARN_ON(ret < 0);
1048 }
1049
1050 static int dwc3_ep0_start_control_status(struct dwc3_ep *dep)
1051 {
1052         struct dwc3             *dwc = dep->dwc;
1053         u32                     type;
1054
1055         type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3
1056                 : DWC3_TRBCTL_CONTROL_STATUS2;
1057
1058         dwc3_ep0_prepare_one_trb(dwc, dep->number,
1059                         dwc->ctrl_req_addr, 0, type, false);
1060         return dwc3_ep0_start_trans(dwc, dep->number);
1061 }
1062
1063 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
1064 {
1065         WARN_ON(dwc3_ep0_start_control_status(dep));
1066 }
1067
1068 static void dwc3_ep0_do_control_status(struct dwc3 *dwc,
1069                 const struct dwc3_event_depevt *event)
1070 {
1071         struct dwc3_ep          *dep = dwc->eps[event->endpoint_number];
1072
1073         __dwc3_ep0_do_control_status(dwc, dep);
1074 }
1075
1076 static void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep)
1077 {
1078         struct dwc3_gadget_ep_cmd_params params;
1079         u32                     cmd;
1080         int                     ret;
1081
1082         if (!dep->resource_index)
1083                 return;
1084
1085         cmd = DWC3_DEPCMD_ENDTRANSFER;
1086         cmd |= DWC3_DEPCMD_CMDIOC;
1087         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1088         memset(&params, 0, sizeof(params));
1089         ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
1090         WARN_ON_ONCE(ret);
1091         dep->resource_index = 0;
1092 }
1093
1094 static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
1095                 const struct dwc3_event_depevt *event)
1096 {
1097         switch (event->status) {
1098         case DEPEVT_STATUS_CONTROL_DATA:
1099                 /*
1100                  * We already have a DATA transfer in the controller's cache,
1101                  * if we receive a XferNotReady(DATA) we will ignore it, unless
1102                  * it's for the wrong direction.
1103                  *
1104                  * In that case, we must issue END_TRANSFER command to the Data
1105                  * Phase we already have started and issue SetStall on the
1106                  * control endpoint.
1107                  */
1108                 if (dwc->ep0_expect_in != event->endpoint_number) {
1109                         struct dwc3_ep  *dep = dwc->eps[dwc->ep0_expect_in];
1110
1111                         dev_err(dwc->dev, "unexpected direction for Data Phase\n");
1112                         dwc3_ep0_end_control_data(dwc, dep);
1113                         dwc3_ep0_stall_and_restart(dwc);
1114                         return;
1115                 }
1116
1117                 break;
1118
1119         case DEPEVT_STATUS_CONTROL_STATUS:
1120                 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
1121                         return;
1122
1123                 dwc->ep0state = EP0_STATUS_PHASE;
1124
1125                 if (dwc->delayed_status) {
1126                         struct dwc3_ep *dep = dwc->eps[0];
1127
1128                         WARN_ON_ONCE(event->endpoint_number != 1);
1129                         /*
1130                          * We should handle the delay STATUS phase here if the
1131                          * request for handling delay STATUS has been queued
1132                          * into the list.
1133                          */
1134                         if (!list_empty(&dep->pending_list)) {
1135                                 dwc->delayed_status = false;
1136                                 usb_gadget_set_state(&dwc->gadget,
1137                                                      USB_STATE_CONFIGURED);
1138                                 dwc3_ep0_do_control_status(dwc, event);
1139                         }
1140
1141                         return;
1142                 }
1143
1144                 dwc3_ep0_do_control_status(dwc, event);
1145         }
1146 }
1147
1148 void dwc3_ep0_interrupt(struct dwc3 *dwc,
1149                 const struct dwc3_event_depevt *event)
1150 {
1151         switch (event->endpoint_event) {
1152         case DWC3_DEPEVT_XFERCOMPLETE:
1153                 dwc3_ep0_xfer_complete(dwc, event);
1154                 break;
1155
1156         case DWC3_DEPEVT_XFERNOTREADY:
1157                 dwc3_ep0_xfernotready(dwc, event);
1158                 break;
1159
1160         case DWC3_DEPEVT_XFERINPROGRESS:
1161         case DWC3_DEPEVT_RXTXFIFOEVT:
1162         case DWC3_DEPEVT_STREAMEVT:
1163         case DWC3_DEPEVT_EPCMDCMPLT:
1164                 break;
1165         }
1166 }