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 "gadget.h"
  35 #include "io.h"
  36
  37 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
  38 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
  39                 struct dwc3_ep *dep, struct dwc3_request *req);
  40
  41 static const char *dwc3_ep0_state_string(enum dwc3_ep0_state state)
  42 {
  43         switch (state) {
  44         case EP0_UNCONNECTED:
  45                 return "Unconnected";
  46         case EP0_SETUP_PHASE:
  47                 return "Setup Phase";
  48         case EP0_DATA_PHASE:
  49                 return "Data Phase";
  50         case EP0_STATUS_PHASE:
  51                 return "Status Phase";
  52         default:
  53                 return "UNKNOWN";
  54         }
  55 }
  56
  57 static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma,
  58                 u32 len, u32 type)
  59 {
  60         struct dwc3_gadget_ep_cmd_params params;
  61         struct dwc3_trb                 *trb;
  62         struct dwc3_ep                  *dep;
  63
  64         int                             ret;
  65
  66         dep = dwc->eps[epnum];
  67         if (dep->flags & DWC3_EP_BUSY) {
  68                 dev_vdbg(dwc->dev, "%s: still busy\n", dep->name);
  69                 return 0;
  70         }
  71
  72         trb = dwc->ep0_trb;
  73
  74         trb->bpl = lower_32_bits(buf_dma);
  75         trb->bph = upper_32_bits(buf_dma);
  76         trb->size = len;
  77         trb->ctrl = type;
  78
  79         trb->ctrl |= (DWC3_TRB_CTRL_HWO
  80                         | DWC3_TRB_CTRL_LST
  81                         | DWC3_TRB_CTRL_IOC
  82                         | DWC3_TRB_CTRL_ISP_IMI);
  83
  84         memset(&params, 0, sizeof(params));
  85         params.param0 = upper_32_bits(dwc->ep0_trb_addr);
  86         params.param1 = lower_32_bits(dwc->ep0_trb_addr);
  87
  88         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
  89                         DWC3_DEPCMD_STARTTRANSFER, &params);
  90         if (ret < 0) {
  91                 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
  92                 return ret;
  93         }
  94
  95         dep->flags |= DWC3_EP_BUSY;
  96         dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
  97                         dep->number);
  98
  99         dwc->ep0_next_event = DWC3_EP0_COMPLETE;
 100
 101         return 0;
 102 }
 103
 104 static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep,
 105                 struct dwc3_request *req)
 106 {
 107         struct dwc3             *dwc = dep->dwc;
 108
 109         req->request.actual     = 0;
 110         req->request.status     = -EINPROGRESS;
 111         req->epnum              = dep->number;
 112
 113         list_add_tail(&req->list, &dep->request_list);
 114
 115         /*
 116          * Gadget driver might not be quick enough to queue a request
 117          * before we get a Transfer Not Ready event on this endpoint.
 118          *
 119          * In that case, we will set DWC3_EP_PENDING_REQUEST. When that
 120          * flag is set, it's telling us that as soon as Gadget queues the
 121          * required request, we should kick the transfer here because the
 122          * IRQ we were waiting for is long gone.
 123          */
 124         if (dep->flags & DWC3_EP_PENDING_REQUEST) {
 125                 unsigned        direction;
 126
 127                 direction = !!(dep->flags & DWC3_EP0_DIR_IN);
 128
 129                 if (dwc->ep0state != EP0_DATA_PHASE) {
 130                         dev_WARN(dwc->dev, "Unexpected pending request\n");
 131                         return 0;
 132                 }
 133
 134                 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
 135
 136                 dep->flags &= ~(DWC3_EP_PENDING_REQUEST |
 137                                 DWC3_EP0_DIR_IN);
 138
 139                 return 0;
 140         }
 141
 142         /*
 143          * In case gadget driver asked us to delay the STATUS phase,
 144          * handle it here.
 145          */
 146         if (dwc->delayed_status) {
 147                 unsigned        direction;
 148
 149                 direction = !dwc->ep0_expect_in;
 150                 dwc->delayed_status = false;
 151                 usb_gadget_set_state(&dwc->gadget, USB_STATE_CONFIGURED);
 152
 153                 if (dwc->ep0state == EP0_STATUS_PHASE)
 154                         __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
 155                 else
 156                         dev_dbg(dwc->dev, "too early for delayed status\n");
 157
 158                 return 0;
 159         }
 160
 161         /*
 162          * Unfortunately we have uncovered a limitation wrt the Data Phase.
 163          *
 164          * Section 9.4 says we can wait for the XferNotReady(DATA) event to
 165          * come before issueing Start Transfer command, but if we do, we will
 166          * miss situations where the host starts another SETUP phase instead of
 167          * the DATA phase.  Such cases happen at least on TD.7.6 of the Link
 168          * Layer Compliance Suite.
 169          *
 170          * The problem surfaces due to the fact that in case of back-to-back
 171          * SETUP packets there will be no XferNotReady(DATA) generated and we
 172          * will be stuck waiting for XferNotReady(DATA) forever.
 173          *
 174          * By looking at tables 9-13 and 9-14 of the Databook, we can see that
 175          * it tells us to start Data Phase right away. It also mentions that if
 176          * we receive a SETUP phase instead of the DATA phase, core will issue
 177          * XferComplete for the DATA phase, before actually initiating it in
 178          * the wire, with the TRB's status set to "SETUP_PENDING". Such status
 179          * can only be used to print some debugging logs, as the core expects
 180          * us to go through to the STATUS phase and start a CONTROL_STATUS TRB,
 181          * just so it completes right away, without transferring anything and,
 182          * only then, we can go back to the SETUP phase.
 183          *
 184          * Because of this scenario, SNPS decided to change the programming
 185          * model of control transfers and support on-demand transfers only for
 186          * the STATUS phase. To fix the issue we have now, we will always wait
 187          * for gadget driver to queue the DATA phase's struct usb_request, then
 188          * start it right away.
 189          *
 190          * If we're actually in a 2-stage transfer, we will wait for
 191          * XferNotReady(STATUS).
 192          */
 193         if (dwc->three_stage_setup) {
 194                 unsigned        direction;
 195
 196                 direction = dwc->ep0_expect_in;
 197                 dwc->ep0state = EP0_DATA_PHASE;
 198
 199                 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
 200
 201                 dep->flags &= ~DWC3_EP0_DIR_IN;
 202         }
 203
 204         return 0;
 205 }
 206
 207 int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
 208                 gfp_t gfp_flags)
 209 {
 210         struct dwc3_request             *req = to_dwc3_request(request);
 211         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 212         struct dwc3                     *dwc = dep->dwc;
 213
 214         unsigned long                   flags;
 215
 216         int                             ret;
 217
 218         spin_lock_irqsave(&dwc->lock, flags);
 219         if (!dep->endpoint.desc) {
 220                 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
 221                                 request, dep->name);
 222                 ret = -ESHUTDOWN;
 223                 goto out;
 224         }
 225
 226         /* we share one TRB for ep0/1 */
 227         if (!list_empty(&dep->request_list)) {
 228                 ret = -EBUSY;
 229                 goto out;
 230         }
 231
 232         dev_vdbg(dwc->dev, "queueing request %p to %s length %d, state '%s'\n",
 233                         request, dep->name, request->length,
 234                         dwc3_ep0_state_string(dwc->ep0state));
 235
 236         ret = __dwc3_gadget_ep0_queue(dep, req);
 237
 238 out:
 239         spin_unlock_irqrestore(&dwc->lock, flags);
 240
 241         return ret;
 242 }
 243
 244 static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
 245 {
 246         struct dwc3_ep          *dep;
 247
 248         /* reinitialize physical ep1 */
 249         dep = dwc->eps[1];
 250         dep->flags = DWC3_EP_ENABLED;
 251
 252         /* stall is always issued on EP0 */
 253         dep = dwc->eps[0];
 254         __dwc3_gadget_ep_set_halt(dep, 1);
 255         dep->flags = DWC3_EP_ENABLED;
 256         dwc->delayed_status = false;
 257
 258         if (!list_empty(&dep->request_list)) {
 259                 struct dwc3_request     *req;
 260
 261                 req = next_request(&dep->request_list);
 262                 dwc3_gadget_giveback(dep, req, -ECONNRESET);
 263         }
 264
 265         dwc->ep0state = EP0_SETUP_PHASE;
 266         dwc3_ep0_out_start(dwc);
 267 }
 268
 269 int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
 270 {
 271         struct dwc3_ep                  *dep = to_dwc3_ep(ep);
 272         struct dwc3                     *dwc = dep->dwc;
 273
 274         dwc3_ep0_stall_and_restart(dwc);
 275
 276         return 0;
 277 }
 278
 279 void dwc3_ep0_out_start(struct dwc3 *dwc)
 280 {
 281         int                             ret;
 282
 283         ret = dwc3_ep0_start_trans(dwc, 0, dwc->ctrl_req_addr, 8,
 284                         DWC3_TRBCTL_CONTROL_SETUP);
 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->is_selfpowered << USB_DEVICE_SELF_POWERED;
 327
 328                 if (dwc->speed == DWC3_DSTS_SUPERSPEED) {
 329                         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 330                         if (reg & DWC3_DCTL_INITU1ENA)
 331                                 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
 332                         if (reg & DWC3_DCTL_INITU2ENA)
 333                                 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
 334                 }
 335
 336                 break;
 337
 338         case USB_RECIP_INTERFACE:
 339                 /*
 340                  * Function Remote Wake Capable D0
 341                  * Function Remote Wakeup       D1
 342                  */
 343                 break;
 344
 345         case USB_RECIP_ENDPOINT:
 346                 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
 347                 if (!dep)
 348                         return -EINVAL;
 349
 350                 if (dep->flags & DWC3_EP_STALL)
 351                         usb_status = 1 << USB_ENDPOINT_HALT;
 352                 break;
 353         default:
 354                 return -EINVAL;
 355         }
 356
 357         response_pkt = (__le16 *) dwc->setup_buf;
 358         *response_pkt = cpu_to_le16(usb_status);
 359
 360         dep = dwc->eps[0];
 361         dwc->ep0_usb_req.dep = dep;
 362         dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
 363         dwc->ep0_usb_req.request.buf = dwc->setup_buf;
 364         dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
 365
 366         return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
 367 }
 368
 369 static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
 370                 struct usb_ctrlrequest *ctrl, int set)
 371 {
 372         struct dwc3_ep          *dep;
 373         u32                     recip;
 374         u32                     wValue;
 375         u32                     wIndex;
 376         u32                     reg;
 377         int                     ret;
 378         enum usb_device_state   state;
 379
 380         wValue = le16_to_cpu(ctrl->wValue);
 381         wIndex = le16_to_cpu(ctrl->wIndex);
 382         recip = ctrl->bRequestType & USB_RECIP_MASK;
 383         state = dwc->gadget.state;
 384
 385         switch (recip) {
 386         case USB_RECIP_DEVICE:
 387
 388                 switch (wValue) {
 389                 case USB_DEVICE_REMOTE_WAKEUP:
 390                         break;
 391                 /*
 392                  * 9.4.1 says only only for SS, in AddressState only for
 393                  * default control pipe
 394                  */
 395                 case USB_DEVICE_U1_ENABLE:
 396                         if (state != USB_STATE_CONFIGURED)
 397                                 return -EINVAL;
 398                         if (dwc->speed != DWC3_DSTS_SUPERSPEED)
 399                                 return -EINVAL;
 400
 401                         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 402                         if (set)
 403                                 reg |= DWC3_DCTL_INITU1ENA;
 404                         else
 405                                 reg &= ~DWC3_DCTL_INITU1ENA;
 406                         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 407                         break;
 408
 409                 case USB_DEVICE_U2_ENABLE:
 410                         if (state != USB_STATE_CONFIGURED)
 411                                 return -EINVAL;
 412                         if (dwc->speed != DWC3_DSTS_SUPERSPEED)
 413                                 return -EINVAL;
 414
 415                         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 416                         if (set)
 417                                 reg |= DWC3_DCTL_INITU2ENA;
 418                         else
 419                                 reg &= ~DWC3_DCTL_INITU2ENA;
 420                         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 421                         break;
 422
 423                 case USB_DEVICE_LTM_ENABLE:
 424                         return -EINVAL;
 425                         break;
 426
 427                 case USB_DEVICE_TEST_MODE:
 428                         if ((wIndex & 0xff) != 0)
 429                                 return -EINVAL;
 430                         if (!set)
 431                                 return -EINVAL;
 432
 433                         dwc->test_mode_nr = wIndex >> 8;
 434                         dwc->test_mode = true;
 435                         break;
 436                 default:
 437                         return -EINVAL;
 438                 }
 439                 break;
 440
 441         case USB_RECIP_INTERFACE:
 442                 switch (wValue) {
 443                 case USB_INTRF_FUNC_SUSPEND:
 444                         if (wIndex & USB_INTRF_FUNC_SUSPEND_LP)
 445                                 /* XXX enable Low power suspend */
 446                                 ;
 447                         if (wIndex & USB_INTRF_FUNC_SUSPEND_RW)
 448                                 /* XXX enable remote wakeup */
 449                                 ;
 450                         break;
 451                 default:
 452                         return -EINVAL;
 453                 }
 454                 break;
 455
 456         case USB_RECIP_ENDPOINT:
 457                 switch (wValue) {
 458                 case USB_ENDPOINT_HALT:
 459                         dep = dwc3_wIndex_to_dep(dwc, wIndex);
 460                         if (!dep)
 461                                 return -EINVAL;
 462                         if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
 463                                 break;
 464                         ret = __dwc3_gadget_ep_set_halt(dep, set);
 465                         if (ret)
 466                                 return -EINVAL;
 467                         break;
 468                 default:
 469                         return -EINVAL;
 470                 }
 471                 break;
 472
 473         default:
 474                 return -EINVAL;
 475         }
 476
 477         return 0;
 478 }
 479
 480 static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 481 {
 482         enum usb_device_state state = dwc->gadget.state;
 483         u32 addr;
 484         u32 reg;
 485
 486         addr = le16_to_cpu(ctrl->wValue);
 487         if (addr > 127) {
 488                 dev_dbg(dwc->dev, "invalid device address %d\n", addr);
 489                 return -EINVAL;
 490         }
 491
 492         if (state == USB_STATE_CONFIGURED) {
 493                 dev_dbg(dwc->dev, "trying to set address when configured\n");
 494                 return -EINVAL;
 495         }
 496
 497         reg = dwc3_readl(dwc->regs, DWC3_DCFG);
 498         reg &= ~(DWC3_DCFG_DEVADDR_MASK);
 499         reg |= DWC3_DCFG_DEVADDR(addr);
 500         dwc3_writel(dwc->regs, DWC3_DCFG, reg);
 501
 502         if (addr)
 503                 usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS);
 504         else
 505                 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
 506
 507         return 0;
 508 }
 509
 510 static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 511 {
 512         int ret;
 513
 514         spin_unlock(&dwc->lock);
 515         ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl);
 516         spin_lock(&dwc->lock);
 517         return ret;
 518 }
 519
 520 static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 521 {
 522         enum usb_device_state state = dwc->gadget.state;
 523         u32 cfg;
 524         int ret;
 525         u32 reg;
 526
 527         dwc->start_config_issued = false;
 528         cfg = le16_to_cpu(ctrl->wValue);
 529
 530         switch (state) {
 531         case USB_STATE_DEFAULT:
 532                 return -EINVAL;
 533                 break;
 534
 535         case USB_STATE_ADDRESS:
 536                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 537                 /* if the cfg matches and the cfg is non zero */
 538                 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
 539
 540                         /*
 541                          * only change state if set_config has already
 542                          * been processed. If gadget driver returns
 543                          * USB_GADGET_DELAYED_STATUS, we will wait
 544                          * to change the state on the next usb_ep_queue()
 545                          */
 546                         if (ret == 0)
 547                                 usb_gadget_set_state(&dwc->gadget,
 548                                                 USB_STATE_CONFIGURED);
 549
 550                         /*
 551                          * Enable transition to U1/U2 state when
 552                          * nothing is pending from application.
 553                          */
 554                         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 555                         reg |= (DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA);
 556                         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 557
 558                         dwc->resize_fifos = true;
 559                         dev_dbg(dwc->dev, "resize fifos flag SET\n");
 560                 }
 561                 break;
 562
 563         case USB_STATE_CONFIGURED:
 564                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 565                 if (!cfg && !ret)
 566                         usb_gadget_set_state(&dwc->gadget,
 567                                         USB_STATE_ADDRESS);
 568                 break;
 569         default:
 570                 ret = -EINVAL;
 571         }
 572         return ret;
 573 }
 574
 575 static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
 576 {
 577         struct dwc3_ep  *dep = to_dwc3_ep(ep);
 578         struct dwc3     *dwc = dep->dwc;
 579
 580         u32             param = 0;
 581         u32             reg;
 582
 583         struct timing {
 584                 u8      u1sel;
 585                 u8      u1pel;
 586                 u16     u2sel;
 587                 u16     u2pel;
 588         } __packed timing;
 589
 590         int             ret;
 591
 592         memcpy(&timing, req->buf, sizeof(timing));
 593
 594         dwc->u1sel = timing.u1sel;
 595         dwc->u1pel = timing.u1pel;
 596         dwc->u2sel = le16_to_cpu(timing.u2sel);
 597         dwc->u2pel = le16_to_cpu(timing.u2pel);
 598
 599         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 600         if (reg & DWC3_DCTL_INITU2ENA)
 601                 param = dwc->u2pel;
 602         if (reg & DWC3_DCTL_INITU1ENA)
 603                 param = dwc->u1pel;
 604
 605         /*
 606          * According to Synopsys Databook, if parameter is
 607          * greater than 125, a value of zero should be
 608          * programmed in the register.
 609          */
 610         if (param > 125)
 611                 param = 0;
 612
 613         /* now that we have the time, issue DGCMD Set Sel */
 614         ret = dwc3_send_gadget_generic_command(dwc,
 615                         DWC3_DGCMD_SET_PERIODIC_PAR, param);
 616         WARN_ON(ret < 0);
 617 }
 618
 619 static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 620 {
 621         struct dwc3_ep  *dep;
 622         enum usb_device_state state = dwc->gadget.state;
 623         u16             wLength;
 624         u16             wValue;
 625
 626         if (state == USB_STATE_DEFAULT)
 627                 return -EINVAL;
 628
 629         wValue = le16_to_cpu(ctrl->wValue);
 630         wLength = le16_to_cpu(ctrl->wLength);
 631
 632         if (wLength != 6) {
 633                 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
 634                                 wLength);
 635                 return -EINVAL;
 636         }
 637
 638         /*
 639          * To handle Set SEL we need to receive 6 bytes from Host. So let's
 640          * queue a usb_request for 6 bytes.
 641          *
 642          * Remember, though, this controller can't handle non-wMaxPacketSize
 643          * aligned transfers on the OUT direction, so we queue a request for
 644          * wMaxPacketSize instead.
 645          */
 646         dep = dwc->eps[0];
 647         dwc->ep0_usb_req.dep = dep;
 648         dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
 649         dwc->ep0_usb_req.request.buf = dwc->setup_buf;
 650         dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
 651
 652         return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
 653 }
 654
 655 static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 656 {
 657         u16             wLength;
 658         u16             wValue;
 659         u16             wIndex;
 660
 661         wValue = le16_to_cpu(ctrl->wValue);
 662         wLength = le16_to_cpu(ctrl->wLength);
 663         wIndex = le16_to_cpu(ctrl->wIndex);
 664
 665         if (wIndex || wLength)
 666                 return -EINVAL;
 667
 668         /*
 669          * REVISIT It's unclear from Databook what to do with this
 670          * value. For now, just cache it.
 671          */
 672         dwc->isoch_delay = wValue;
 673
 674         return 0;
 675 }
 676
 677 static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 678 {
 679         int ret;
 680
 681         switch (ctrl->bRequest) {
 682         case USB_REQ_GET_STATUS:
 683                 dev_vdbg(dwc->dev, "USB_REQ_GET_STATUS\n");
 684                 ret = dwc3_ep0_handle_status(dwc, ctrl);
 685                 break;
 686         case USB_REQ_CLEAR_FEATURE:
 687                 dev_vdbg(dwc->dev, "USB_REQ_CLEAR_FEATURE\n");
 688                 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
 689                 break;
 690         case USB_REQ_SET_FEATURE:
 691                 dev_vdbg(dwc->dev, "USB_REQ_SET_FEATURE\n");
 692                 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
 693                 break;
 694         case USB_REQ_SET_ADDRESS:
 695                 dev_vdbg(dwc->dev, "USB_REQ_SET_ADDRESS\n");
 696                 ret = dwc3_ep0_set_address(dwc, ctrl);
 697                 break;
 698         case USB_REQ_SET_CONFIGURATION:
 699                 dev_vdbg(dwc->dev, "USB_REQ_SET_CONFIGURATION\n");
 700                 ret = dwc3_ep0_set_config(dwc, ctrl);
 701                 break;
 702         case USB_REQ_SET_SEL:
 703                 dev_vdbg(dwc->dev, "USB_REQ_SET_SEL\n");
 704                 ret = dwc3_ep0_set_sel(dwc, ctrl);
 705                 break;
 706         case USB_REQ_SET_ISOCH_DELAY:
 707                 dev_vdbg(dwc->dev, "USB_REQ_SET_ISOCH_DELAY\n");
 708                 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
 709                 break;
 710         default:
 711                 dev_vdbg(dwc->dev, "Forwarding to gadget driver\n");
 712                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 713                 break;
 714         }
 715
 716         return ret;
 717 }
 718
 719 static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
 720                 const struct dwc3_event_depevt *event)
 721 {
 722         struct usb_ctrlrequest *ctrl = dwc->ctrl_req;
 723         int ret = -EINVAL;
 724         u32 len;
 725
 726         if (!dwc->gadget_driver)
 727                 goto out;
 728
 729         len = le16_to_cpu(ctrl->wLength);
 730         if (!len) {
 731                 dwc->three_stage_setup = false;
 732                 dwc->ep0_expect_in = false;
 733                 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
 734         } else {
 735                 dwc->three_stage_setup = true;
 736                 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
 737                 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
 738         }
 739
 740         if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
 741                 ret = dwc3_ep0_std_request(dwc, ctrl);
 742         else
 743                 ret = dwc3_ep0_delegate_req(dwc, ctrl);
 744
 745         if (ret == USB_GADGET_DELAYED_STATUS)
 746                 dwc->delayed_status = true;
 747
 748 out:
 749         if (ret < 0)
 750                 dwc3_ep0_stall_and_restart(dwc);
 751 }
 752
 753 static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 754                 const struct dwc3_event_depevt *event)
 755 {
 756         struct dwc3_request     *r = NULL;
 757         struct usb_request      *ur;
 758         struct dwc3_trb         *trb;
 759         struct dwc3_ep          *ep0;
 760         u32                     transferred;
 761         u32                     status;
 762         u32                     length;
 763         u8                      epnum;
 764
 765         epnum = event->endpoint_number;
 766         ep0 = dwc->eps[0];
 767
 768         dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
 769
 770         r = next_request(&ep0->request_list);
 771         ur = &r->request;
 772
 773         trb = dwc->ep0_trb;
 774
 775         status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 776         if (status == DWC3_TRBSTS_SETUP_PENDING) {
 777                 dev_dbg(dwc->dev, "Setup Pending received\n");
 778
 779                 if (r)
 780                         dwc3_gadget_giveback(ep0, r, -ECONNRESET);
 781
 782                 return;
 783         }
 784
 785         length = trb->size & DWC3_TRB_SIZE_MASK;
 786
 787         if (dwc->ep0_bounced) {
 788                 unsigned transfer_size = ur->length;
 789                 unsigned maxp = ep0->endpoint.maxpacket;
 790
 791                 transfer_size += (maxp - (transfer_size % maxp));
 792                 transferred = min_t(u32, ur->length,
 793                                 transfer_size - length);
 794                 memcpy(ur->buf, dwc->ep0_bounce, transferred);
 795         } else {
 796                 transferred = ur->length - length;
 797         }
 798
 799         ur->actual += transferred;
 800
 801         if ((epnum & 1) && ur->actual < ur->length) {
 802                 /* for some reason we did not get everything out */
 803
 804                 dwc3_ep0_stall_and_restart(dwc);
 805         } else {
 806                 /*
 807                  * handle the case where we have to send a zero packet. This
 808                  * seems to be case when req.length > maxpacket. Could it be?
 809                  */
 810                 if (r)
 811                         dwc3_gadget_giveback(ep0, r, 0);
 812         }
 813 }
 814
 815 static void dwc3_ep0_complete_status(struct dwc3 *dwc,
 816                 const struct dwc3_event_depevt *event)
 817 {
 818         struct dwc3_request     *r;
 819         struct dwc3_ep          *dep;
 820         struct dwc3_trb         *trb;
 821         u32                     status;
 822
 823         dep = dwc->eps[0];
 824         trb = dwc->ep0_trb;
 825
 826         if (!list_empty(&dep->request_list)) {
 827                 r = next_request(&dep->request_list);
 828
 829                 dwc3_gadget_giveback(dep, r, 0);
 830         }
 831
 832         if (dwc->test_mode) {
 833                 int ret;
 834
 835                 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
 836                 if (ret < 0) {
 837                         dev_dbg(dwc->dev, "Invalid Test #%d\n",
 838                                         dwc->test_mode_nr);
 839                         dwc3_ep0_stall_and_restart(dwc);
 840                         return;
 841                 }
 842         }
 843
 844         status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 845         if (status == DWC3_TRBSTS_SETUP_PENDING)
 846                 dev_dbg(dwc->dev, "Setup Pending received\n");
 847
 848         dwc->ep0state = EP0_SETUP_PHASE;
 849         dwc3_ep0_out_start(dwc);
 850 }
 851
 852 static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
 853                         const struct dwc3_event_depevt *event)
 854 {
 855         struct dwc3_ep          *dep = dwc->eps[event->endpoint_number];
 856
 857         dep->flags &= ~DWC3_EP_BUSY;
 858         dep->resource_index = 0;
 859         dwc->setup_packet_pending = false;
 860
 861         switch (dwc->ep0state) {
 862         case EP0_SETUP_PHASE:
 863                 dev_vdbg(dwc->dev, "Inspecting Setup Bytes\n");
 864                 dwc3_ep0_inspect_setup(dwc, event);
 865                 break;
 866
 867         case EP0_DATA_PHASE:
 868                 dev_vdbg(dwc->dev, "Data Phase\n");
 869                 dwc3_ep0_complete_data(dwc, event);
 870                 break;
 871
 872         case EP0_STATUS_PHASE:
 873                 dev_vdbg(dwc->dev, "Status Phase\n");
 874                 dwc3_ep0_complete_status(dwc, event);
 875                 break;
 876         default:
 877                 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
 878         }
 879 }
 880
 881 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
 882                 struct dwc3_ep *dep, struct dwc3_request *req)
 883 {
 884         int                     ret;
 885
 886         req->direction = !!dep->number;
 887
 888         if (req->request.length == 0) {
 889                 ret = dwc3_ep0_start_trans(dwc, dep->number,
 890                                 dwc->ctrl_req_addr, 0,
 891                                 DWC3_TRBCTL_CONTROL_DATA);
 892         } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
 893                         && (dep->number == 0)) {
 894                 u32     transfer_size;
 895                 u32     maxpacket;
 896
 897                 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
 898                                 dep->number);
 899                 if (ret) {
 900                         dev_dbg(dwc->dev, "failed to map request\n");
 901                         return;
 902                 }
 903
 904                 WARN_ON(req->request.length > DWC3_EP0_BOUNCE_SIZE);
 905
 906                 maxpacket = dep->endpoint.maxpacket;
 907                 transfer_size = roundup(req->request.length, maxpacket);
 908
 909                 dwc->ep0_bounced = true;
 910
 911                 /*
 912                  * REVISIT in case request length is bigger than
 913                  * DWC3_EP0_BOUNCE_SIZE we will need two chained
 914                  * TRBs to handle the transfer.
 915                  */
 916                 ret = dwc3_ep0_start_trans(dwc, dep->number,
 917                                 dwc->ep0_bounce_addr, transfer_size,
 918                                 DWC3_TRBCTL_CONTROL_DATA);
 919         } else {
 920                 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
 921                                 dep->number);
 922                 if (ret) {
 923                         dev_dbg(dwc->dev, "failed to map request\n");
 924                         return;
 925                 }
 926
 927                 ret = dwc3_ep0_start_trans(dwc, dep->number, req->request.dma,
 928                                 req->request.length, DWC3_TRBCTL_CONTROL_DATA);
 929         }
 930
 931         WARN_ON(ret < 0);
 932 }
 933
 934 static int dwc3_ep0_start_control_status(struct dwc3_ep *dep)
 935 {
 936         struct dwc3             *dwc = dep->dwc;
 937         u32                     type;
 938
 939         type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3
 940                 : DWC3_TRBCTL_CONTROL_STATUS2;
 941
 942         return dwc3_ep0_start_trans(dwc, dep->number,
 943                         dwc->ctrl_req_addr, 0, type);
 944 }
 945
 946 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
 947 {
 948         if (dwc->resize_fifos) {
 949                 dev_dbg(dwc->dev, "starting to resize fifos\n");
 950                 dwc3_gadget_resize_tx_fifos(dwc);
 951                 dwc->resize_fifos = 0;
 952         }
 953
 954         WARN_ON(dwc3_ep0_start_control_status(dep));
 955 }
 956
 957 static void dwc3_ep0_do_control_status(struct dwc3 *dwc,
 958                 const struct dwc3_event_depevt *event)
 959 {
 960         struct dwc3_ep          *dep = dwc->eps[event->endpoint_number];
 961
 962         __dwc3_ep0_do_control_status(dwc, dep);
 963 }
 964
 965 static void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep)
 966 {
 967         struct dwc3_gadget_ep_cmd_params params;
 968         u32                     cmd;
 969         int                     ret;
 970
 971         if (!dep->resource_index)
 972                 return;
 973
 974         cmd = DWC3_DEPCMD_ENDTRANSFER;
 975         cmd |= DWC3_DEPCMD_CMDIOC;
 976         cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
 977         memset(&params, 0, sizeof(params));
 978         ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
 979         WARN_ON_ONCE(ret);
 980         dep->resource_index = 0;
 981 }
 982
 983 static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
 984                 const struct dwc3_event_depevt *event)
 985 {
 986         dwc->setup_packet_pending = true;
 987
 988         switch (event->status) {
 989         case DEPEVT_STATUS_CONTROL_DATA:
 990                 dev_vdbg(dwc->dev, "Control Data\n");
 991
 992                 /*
 993                  * We already have a DATA transfer in the controller's cache,
 994                  * if we receive a XferNotReady(DATA) we will ignore it, unless
 995                  * it's for the wrong direction.
 996                  *
 997                  * In that case, we must issue END_TRANSFER command to the Data
 998                  * Phase we already have started and issue SetStall on the
 999                  * control endpoint.
1000                  */
1001                 if (dwc->ep0_expect_in != event->endpoint_number) {
1002                         struct dwc3_ep  *dep = dwc->eps[dwc->ep0_expect_in];
1003
1004                         dev_vdbg(dwc->dev, "Wrong direction for Data phase\n");
1005                         dwc3_ep0_end_control_data(dwc, dep);
1006                         dwc3_ep0_stall_and_restart(dwc);
1007                         return;
1008                 }
1009
1010                 break;
1011
1012         case DEPEVT_STATUS_CONTROL_STATUS:
1013                 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
1014                         return;
1015
1016                 dev_vdbg(dwc->dev, "Control Status\n");
1017
1018                 dwc->ep0state = EP0_STATUS_PHASE;
1019
1020                 if (dwc->delayed_status) {
1021                         WARN_ON_ONCE(event->endpoint_number != 1);
1022                         dev_vdbg(dwc->dev, "Mass Storage delayed status\n");
1023                         return;
1024                 }
1025
1026                 dwc3_ep0_do_control_status(dwc, event);
1027         }
1028 }
1029
1030 void dwc3_ep0_interrupt(struct dwc3 *dwc,
1031                 const struct dwc3_event_depevt *event)
1032 {
1033         u8                      epnum = event->endpoint_number;
1034
1035         dev_dbg(dwc->dev, "%s while ep%d%s in state '%s'\n",
1036                         dwc3_ep_event_string(event->endpoint_event),
1037                         epnum >> 1, (epnum & 1) ? "in" : "out",
1038                         dwc3_ep0_state_string(dwc->ep0state));
1039
1040         switch (event->endpoint_event) {
1041         case DWC3_DEPEVT_XFERCOMPLETE:
1042                 dwc3_ep0_xfer_complete(dwc, event);
1043                 break;
1044
1045         case DWC3_DEPEVT_XFERNOTREADY:
1046                 dwc3_ep0_xfernotready(dwc, event);
1047                 break;
1048
1049         case DWC3_DEPEVT_XFERINPROGRESS:
1050         case DWC3_DEPEVT_RXTXFIFOEVT:
1051         case DWC3_DEPEVT_STREAMEVT:
1052         case DWC3_DEPEVT_EPCMDCMPLT:
1053                 break;
1054         }
1055 }