1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ep0.c - DesignWare USB3 DRD Controller Endpoint 0 Handling 4 * 5 * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com 6 * 7 * Authors: Felipe Balbi <balbi@ti.com>, 8 * Sebastian Andrzej Siewior <bigeasy@linutronix.de> 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/spinlock.h> 14 #include <linux/platform_device.h> 15 #include <linux/pm_runtime.h> 16 #include <linux/interrupt.h> 17 #include <linux/io.h> 18 #include <linux/list.h> 19 #include <linux/dma-mapping.h> 20 21 #include <linux/usb/ch9.h> 22 #include <linux/usb/gadget.h> 23 #include <linux/usb/composite.h> 24 25 #include "core.h" 26 #include "debug.h" 27 #include "gadget.h" 28 #include "io.h" 29 30 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep); 31 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc, 32 struct dwc3_ep *dep, struct dwc3_request *req); 33 static int dwc3_ep0_delegate_req(struct dwc3 *dwc, 34 struct usb_ctrlrequest *ctrl); 35 36 static void dwc3_ep0_prepare_one_trb(struct dwc3_ep *dep, 37 dma_addr_t buf_dma, u32 len, u32 type, bool chain) 38 { 39 struct dwc3_trb *trb; 40 struct dwc3 *dwc; 41 42 dwc = dep->dwc; 43 trb = &dwc->ep0_trb[dep->trb_enqueue]; 44 45 if (chain) 46 dep->trb_enqueue++; 47 48 trb->bpl = lower_32_bits(buf_dma); 49 trb->bph = upper_32_bits(buf_dma); 50 trb->size = len; 51 trb->ctrl = type; 52 53 trb->ctrl |= (DWC3_TRB_CTRL_HWO 54 | DWC3_TRB_CTRL_ISP_IMI); 55 56 if (chain) 57 trb->ctrl |= DWC3_TRB_CTRL_CHN; 58 else 59 trb->ctrl |= (DWC3_TRB_CTRL_IOC 60 | DWC3_TRB_CTRL_LST); 61 62 trace_dwc3_prepare_trb(dep, trb); 63 } 64 65 static int dwc3_ep0_start_trans(struct dwc3_ep *dep) 66 { 67 struct dwc3_gadget_ep_cmd_params params; 68 struct dwc3 *dwc; 69 int ret; 70 71 if (dep->flags & DWC3_EP_TRANSFER_STARTED) 72 return 0; 73 74 dwc = dep->dwc; 75 76 memset(¶ms, 0, sizeof(params)); 77 params.param0 = upper_32_bits(dwc->ep0_trb_addr); 78 params.param1 = lower_32_bits(dwc->ep0_trb_addr); 79 80 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_STARTTRANSFER, ¶ms); 81 if (ret < 0) 82 return ret; 83 84 dwc->ep0_next_event = DWC3_EP0_COMPLETE; 85 86 return 0; 87 } 88 89 static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep, 90 struct dwc3_request *req) 91 { 92 struct dwc3 *dwc = dep->dwc; 93 94 req->request.actual = 0; 95 req->request.status = -EINPROGRESS; 96 req->epnum = dep->number; 97 98 list_add_tail(&req->list, &dep->pending_list); 99 100 /* 101 * Gadget driver might not be quick enough to queue a request 102 * before we get a Transfer Not Ready event on this endpoint. 103 * 104 * In that case, we will set DWC3_EP_PENDING_REQUEST. When that 105 * flag is set, it's telling us that as soon as Gadget queues the 106 * required request, we should kick the transfer here because the 107 * IRQ we were waiting for is long gone. 108 */ 109 if (dep->flags & DWC3_EP_PENDING_REQUEST) { 110 unsigned int direction; 111 112 direction = !!(dep->flags & DWC3_EP0_DIR_IN); 113 114 if (dwc->ep0state != EP0_DATA_PHASE) { 115 dev_WARN(dwc->dev, "Unexpected pending request\n"); 116 return 0; 117 } 118 119 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req); 120 121 dep->flags &= ~(DWC3_EP_PENDING_REQUEST | 122 DWC3_EP0_DIR_IN); 123 124 return 0; 125 } 126 127 /* 128 * In case gadget driver asked us to delay the STATUS phase, 129 * handle it here. 130 */ 131 if (dwc->delayed_status) { 132 unsigned int direction; 133 134 direction = !dwc->ep0_expect_in; 135 dwc->delayed_status = false; 136 usb_gadget_set_state(dwc->gadget, USB_STATE_CONFIGURED); 137 138 if (dwc->ep0state == EP0_STATUS_PHASE) 139 __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]); 140 141 return 0; 142 } 143 144 /* 145 * Unfortunately we have uncovered a limitation wrt the Data Phase. 146 * 147 * Section 9.4 says we can wait for the XferNotReady(DATA) event to 148 * come before issueing Start Transfer command, but if we do, we will 149 * miss situations where the host starts another SETUP phase instead of 150 * the DATA phase. Such cases happen at least on TD.7.6 of the Link 151 * Layer Compliance Suite. 152 * 153 * The problem surfaces due to the fact that in case of back-to-back 154 * SETUP packets there will be no XferNotReady(DATA) generated and we 155 * will be stuck waiting for XferNotReady(DATA) forever. 156 * 157 * By looking at tables 9-13 and 9-14 of the Databook, we can see that 158 * it tells us to start Data Phase right away. It also mentions that if 159 * we receive a SETUP phase instead of the DATA phase, core will issue 160 * XferComplete for the DATA phase, before actually initiating it in 161 * the wire, with the TRB's status set to "SETUP_PENDING". Such status 162 * can only be used to print some debugging logs, as the core expects 163 * us to go through to the STATUS phase and start a CONTROL_STATUS TRB, 164 * just so it completes right away, without transferring anything and, 165 * only then, we can go back to the SETUP phase. 166 * 167 * Because of this scenario, SNPS decided to change the programming 168 * model of control transfers and support on-demand transfers only for 169 * the STATUS phase. To fix the issue we have now, we will always wait 170 * for gadget driver to queue the DATA phase's struct usb_request, then 171 * start it right away. 172 * 173 * If we're actually in a 2-stage transfer, we will wait for 174 * XferNotReady(STATUS). 175 */ 176 if (dwc->three_stage_setup) { 177 unsigned int direction; 178 179 direction = dwc->ep0_expect_in; 180 dwc->ep0state = EP0_DATA_PHASE; 181 182 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req); 183 184 dep->flags &= ~DWC3_EP0_DIR_IN; 185 } 186 187 return 0; 188 } 189 190 int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request, 191 gfp_t gfp_flags) 192 { 193 struct dwc3_request *req = to_dwc3_request(request); 194 struct dwc3_ep *dep = to_dwc3_ep(ep); 195 struct dwc3 *dwc = dep->dwc; 196 197 unsigned long flags; 198 199 int ret; 200 201 spin_lock_irqsave(&dwc->lock, flags); 202 if (!dep->endpoint.desc || !dwc->pullups_connected || !dwc->connected) { 203 dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n", 204 dep->name); 205 ret = -ESHUTDOWN; 206 goto out; 207 } 208 209 /* we share one TRB for ep0/1 */ 210 if (!list_empty(&dep->pending_list)) { 211 ret = -EBUSY; 212 goto out; 213 } 214 215 ret = __dwc3_gadget_ep0_queue(dep, req); 216 217 out: 218 spin_unlock_irqrestore(&dwc->lock, flags); 219 220 return ret; 221 } 222 223 void dwc3_ep0_stall_and_restart(struct dwc3 *dwc) 224 { 225 struct dwc3_ep *dep; 226 227 /* reinitialize physical ep1 */ 228 dep = dwc->eps[1]; 229 dep->flags = DWC3_EP_ENABLED; 230 231 /* stall is always issued on EP0 */ 232 dep = dwc->eps[0]; 233 __dwc3_gadget_ep_set_halt(dep, 1, false); 234 dep->flags = DWC3_EP_ENABLED; 235 dwc->delayed_status = false; 236 237 if (!list_empty(&dep->pending_list)) { 238 struct dwc3_request *req; 239 240 req = next_request(&dep->pending_list); 241 dwc3_gadget_giveback(dep, req, -ECONNRESET); 242 } 243 244 dwc->eps[0]->trb_enqueue = 0; 245 dwc->eps[1]->trb_enqueue = 0; 246 dwc->ep0state = EP0_SETUP_PHASE; 247 dwc3_ep0_out_start(dwc); 248 } 249 250 int __dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value) 251 { 252 struct dwc3_ep *dep = to_dwc3_ep(ep); 253 struct dwc3 *dwc = dep->dwc; 254 255 dwc3_ep0_stall_and_restart(dwc); 256 257 return 0; 258 } 259 260 int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value) 261 { 262 struct dwc3_ep *dep = to_dwc3_ep(ep); 263 struct dwc3 *dwc = dep->dwc; 264 unsigned long flags; 265 int ret; 266 267 spin_lock_irqsave(&dwc->lock, flags); 268 ret = __dwc3_gadget_ep0_set_halt(ep, value); 269 spin_unlock_irqrestore(&dwc->lock, flags); 270 271 return ret; 272 } 273 274 void dwc3_ep0_out_start(struct dwc3 *dwc) 275 { 276 struct dwc3_ep *dep; 277 int ret; 278 int i; 279 280 complete(&dwc->ep0_in_setup); 281 282 dep = dwc->eps[0]; 283 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 8, 284 DWC3_TRBCTL_CONTROL_SETUP, false); 285 ret = dwc3_ep0_start_trans(dep); 286 WARN_ON(ret < 0); 287 for (i = 2; i < DWC3_ENDPOINTS_NUM; i++) { 288 struct dwc3_ep *dwc3_ep; 289 290 dwc3_ep = dwc->eps[i]; 291 if (!dwc3_ep) 292 continue; 293 294 if (!(dwc3_ep->flags & DWC3_EP_DELAY_STOP)) 295 continue; 296 297 dwc3_ep->flags &= ~DWC3_EP_DELAY_STOP; 298 if (dwc->connected) 299 dwc3_stop_active_transfer(dwc3_ep, true, true); 300 else 301 dwc3_remove_requests(dwc, dwc3_ep, -ESHUTDOWN); 302 } 303 } 304 305 static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le) 306 { 307 struct dwc3_ep *dep; 308 u32 windex = le16_to_cpu(wIndex_le); 309 u32 epnum; 310 311 epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1; 312 if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) 313 epnum |= 1; 314 315 dep = dwc->eps[epnum]; 316 if (dep == NULL) 317 return NULL; 318 319 if (dep->flags & DWC3_EP_ENABLED) 320 return dep; 321 322 return NULL; 323 } 324 325 static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req) 326 { 327 } 328 /* 329 * ch 9.4.5 330 */ 331 static int dwc3_ep0_handle_status(struct dwc3 *dwc, 332 struct usb_ctrlrequest *ctrl) 333 { 334 struct dwc3_ep *dep; 335 u32 recip; 336 u32 value; 337 u32 reg; 338 u16 usb_status = 0; 339 __le16 *response_pkt; 340 341 /* We don't support PTM_STATUS */ 342 value = le16_to_cpu(ctrl->wValue); 343 if (value != 0) 344 return -EINVAL; 345 346 recip = ctrl->bRequestType & USB_RECIP_MASK; 347 switch (recip) { 348 case USB_RECIP_DEVICE: 349 /* 350 * LTM will be set once we know how to set this in HW. 351 */ 352 usb_status |= dwc->gadget->is_selfpowered; 353 354 if ((dwc->speed == DWC3_DSTS_SUPERSPEED) || 355 (dwc->speed == DWC3_DSTS_SUPERSPEED_PLUS)) { 356 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 357 if (reg & DWC3_DCTL_INITU1ENA) 358 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED; 359 if (reg & DWC3_DCTL_INITU2ENA) 360 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED; 361 } else { 362 usb_status |= dwc->gadget->wakeup_armed << 363 USB_DEVICE_REMOTE_WAKEUP; 364 } 365 366 break; 367 368 case USB_RECIP_INTERFACE: 369 /* 370 * Function Remote Wake Capable D0 371 * Function Remote Wakeup D1 372 */ 373 return dwc3_ep0_delegate_req(dwc, ctrl); 374 375 case USB_RECIP_ENDPOINT: 376 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex); 377 if (!dep) 378 return -EINVAL; 379 380 if (dep->flags & DWC3_EP_STALL) 381 usb_status = 1 << USB_ENDPOINT_HALT; 382 break; 383 default: 384 return -EINVAL; 385 } 386 387 response_pkt = (__le16 *) dwc->setup_buf; 388 *response_pkt = cpu_to_le16(usb_status); 389 390 dep = dwc->eps[0]; 391 dwc->ep0_usb_req.dep = dep; 392 dwc->ep0_usb_req.request.length = sizeof(*response_pkt); 393 dwc->ep0_usb_req.request.buf = dwc->setup_buf; 394 dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl; 395 396 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req); 397 } 398 399 static int dwc3_ep0_handle_u1(struct dwc3 *dwc, enum usb_device_state state, 400 int set) 401 { 402 u32 reg; 403 404 if (state != USB_STATE_CONFIGURED) 405 return -EINVAL; 406 if ((dwc->speed != DWC3_DSTS_SUPERSPEED) && 407 (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS)) 408 return -EINVAL; 409 if (set && dwc->dis_u1_entry_quirk) 410 return -EINVAL; 411 412 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 413 if (set) 414 reg |= DWC3_DCTL_INITU1ENA; 415 else 416 reg &= ~DWC3_DCTL_INITU1ENA; 417 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 418 419 return 0; 420 } 421 422 static int dwc3_ep0_handle_u2(struct dwc3 *dwc, enum usb_device_state state, 423 int set) 424 { 425 u32 reg; 426 427 428 if (state != USB_STATE_CONFIGURED) 429 return -EINVAL; 430 if ((dwc->speed != DWC3_DSTS_SUPERSPEED) && 431 (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS)) 432 return -EINVAL; 433 if (set && dwc->dis_u2_entry_quirk) 434 return -EINVAL; 435 436 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 437 if (set) 438 reg |= DWC3_DCTL_INITU2ENA; 439 else 440 reg &= ~DWC3_DCTL_INITU2ENA; 441 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 442 443 return 0; 444 } 445 446 static int dwc3_ep0_handle_test(struct dwc3 *dwc, enum usb_device_state state, 447 u32 wIndex, int set) 448 { 449 if ((wIndex & 0xff) != 0) 450 return -EINVAL; 451 if (!set) 452 return -EINVAL; 453 454 switch (wIndex >> 8) { 455 case USB_TEST_J: 456 case USB_TEST_K: 457 case USB_TEST_SE0_NAK: 458 case USB_TEST_PACKET: 459 case USB_TEST_FORCE_ENABLE: 460 dwc->test_mode_nr = wIndex >> 8; 461 dwc->test_mode = true; 462 break; 463 default: 464 return -EINVAL; 465 } 466 467 return 0; 468 } 469 470 static int dwc3_ep0_handle_device(struct dwc3 *dwc, 471 struct usb_ctrlrequest *ctrl, int set) 472 { 473 enum usb_device_state state; 474 u32 wValue; 475 u32 wIndex; 476 int ret = 0; 477 478 wValue = le16_to_cpu(ctrl->wValue); 479 wIndex = le16_to_cpu(ctrl->wIndex); 480 state = dwc->gadget->state; 481 482 switch (wValue) { 483 case USB_DEVICE_REMOTE_WAKEUP: 484 if (dwc->wakeup_configured) 485 dwc->gadget->wakeup_armed = set; 486 else 487 ret = -EINVAL; 488 break; 489 /* 490 * 9.4.1 says only for SS, in AddressState only for 491 * default control pipe 492 */ 493 case USB_DEVICE_U1_ENABLE: 494 ret = dwc3_ep0_handle_u1(dwc, state, set); 495 break; 496 case USB_DEVICE_U2_ENABLE: 497 ret = dwc3_ep0_handle_u2(dwc, state, set); 498 break; 499 case USB_DEVICE_LTM_ENABLE: 500 ret = -EINVAL; 501 break; 502 case USB_DEVICE_TEST_MODE: 503 ret = dwc3_ep0_handle_test(dwc, state, wIndex, set); 504 break; 505 default: 506 ret = -EINVAL; 507 } 508 509 return ret; 510 } 511 512 static int dwc3_ep0_handle_intf(struct dwc3 *dwc, 513 struct usb_ctrlrequest *ctrl, int set) 514 { 515 u32 wValue; 516 int ret = 0; 517 518 wValue = le16_to_cpu(ctrl->wValue); 519 520 switch (wValue) { 521 case USB_INTRF_FUNC_SUSPEND: 522 ret = dwc3_ep0_delegate_req(dwc, ctrl); 523 break; 524 default: 525 ret = -EINVAL; 526 } 527 528 return ret; 529 } 530 531 static int dwc3_ep0_handle_endpoint(struct dwc3 *dwc, 532 struct usb_ctrlrequest *ctrl, int set) 533 { 534 struct dwc3_ep *dep; 535 u32 wValue; 536 int ret; 537 538 wValue = le16_to_cpu(ctrl->wValue); 539 540 switch (wValue) { 541 case USB_ENDPOINT_HALT: 542 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex); 543 if (!dep) 544 return -EINVAL; 545 546 if (set == 0 && (dep->flags & DWC3_EP_WEDGE)) 547 break; 548 549 ret = __dwc3_gadget_ep_set_halt(dep, set, true); 550 if (ret) 551 return -EINVAL; 552 553 /* ClearFeature(Halt) may need delayed status */ 554 if (!set && (dep->flags & DWC3_EP_END_TRANSFER_PENDING)) 555 return USB_GADGET_DELAYED_STATUS; 556 557 break; 558 default: 559 return -EINVAL; 560 } 561 562 return 0; 563 } 564 565 static int dwc3_ep0_handle_feature(struct dwc3 *dwc, 566 struct usb_ctrlrequest *ctrl, int set) 567 { 568 u32 recip; 569 int ret; 570 571 recip = ctrl->bRequestType & USB_RECIP_MASK; 572 573 switch (recip) { 574 case USB_RECIP_DEVICE: 575 ret = dwc3_ep0_handle_device(dwc, ctrl, set); 576 break; 577 case USB_RECIP_INTERFACE: 578 ret = dwc3_ep0_handle_intf(dwc, ctrl, set); 579 break; 580 case USB_RECIP_ENDPOINT: 581 ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set); 582 break; 583 default: 584 ret = -EINVAL; 585 } 586 587 return ret; 588 } 589 590 static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 591 { 592 enum usb_device_state state = dwc->gadget->state; 593 u32 addr; 594 u32 reg; 595 596 addr = le16_to_cpu(ctrl->wValue); 597 if (addr > 127) { 598 dev_err(dwc->dev, "invalid device address %d\n", addr); 599 return -EINVAL; 600 } 601 602 if (state == USB_STATE_CONFIGURED) { 603 dev_err(dwc->dev, "can't SetAddress() from Configured State\n"); 604 return -EINVAL; 605 } 606 607 reg = dwc3_readl(dwc->regs, DWC3_DCFG); 608 reg &= ~(DWC3_DCFG_DEVADDR_MASK); 609 reg |= DWC3_DCFG_DEVADDR(addr); 610 dwc3_writel(dwc->regs, DWC3_DCFG, reg); 611 612 if (addr) 613 usb_gadget_set_state(dwc->gadget, USB_STATE_ADDRESS); 614 else 615 usb_gadget_set_state(dwc->gadget, USB_STATE_DEFAULT); 616 617 return 0; 618 } 619 620 static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 621 { 622 int ret = -EINVAL; 623 624 if (dwc->async_callbacks) { 625 spin_unlock(&dwc->lock); 626 ret = dwc->gadget_driver->setup(dwc->gadget, ctrl); 627 spin_lock(&dwc->lock); 628 } 629 return ret; 630 } 631 632 static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 633 { 634 enum usb_device_state state = dwc->gadget->state; 635 u32 cfg; 636 int ret; 637 u32 reg; 638 639 cfg = le16_to_cpu(ctrl->wValue); 640 641 switch (state) { 642 case USB_STATE_DEFAULT: 643 return -EINVAL; 644 645 case USB_STATE_ADDRESS: 646 dwc3_gadget_clear_tx_fifos(dwc); 647 648 ret = dwc3_ep0_delegate_req(dwc, ctrl); 649 /* if the cfg matches and the cfg is non zero */ 650 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) { 651 652 /* 653 * only change state if set_config has already 654 * been processed. If gadget driver returns 655 * USB_GADGET_DELAYED_STATUS, we will wait 656 * to change the state on the next usb_ep_queue() 657 */ 658 if (ret == 0) 659 usb_gadget_set_state(dwc->gadget, 660 USB_STATE_CONFIGURED); 661 662 /* 663 * Enable transition to U1/U2 state when 664 * nothing is pending from application. 665 */ 666 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 667 if (!dwc->dis_u1_entry_quirk) 668 reg |= DWC3_DCTL_ACCEPTU1ENA; 669 if (!dwc->dis_u2_entry_quirk) 670 reg |= DWC3_DCTL_ACCEPTU2ENA; 671 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 672 } 673 break; 674 675 case USB_STATE_CONFIGURED: 676 ret = dwc3_ep0_delegate_req(dwc, ctrl); 677 if (!cfg && !ret) 678 usb_gadget_set_state(dwc->gadget, 679 USB_STATE_ADDRESS); 680 break; 681 default: 682 ret = -EINVAL; 683 } 684 return ret; 685 } 686 687 static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req) 688 { 689 struct dwc3_ep *dep = to_dwc3_ep(ep); 690 struct dwc3 *dwc = dep->dwc; 691 692 u32 param = 0; 693 u32 reg; 694 695 struct timing { 696 u8 u1sel; 697 u8 u1pel; 698 __le16 u2sel; 699 __le16 u2pel; 700 } __packed timing; 701 702 int ret; 703 704 memcpy(&timing, req->buf, sizeof(timing)); 705 706 dwc->u1sel = timing.u1sel; 707 dwc->u1pel = timing.u1pel; 708 dwc->u2sel = le16_to_cpu(timing.u2sel); 709 dwc->u2pel = le16_to_cpu(timing.u2pel); 710 711 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 712 if (reg & DWC3_DCTL_INITU2ENA) 713 param = dwc->u2pel; 714 if (reg & DWC3_DCTL_INITU1ENA) 715 param = dwc->u1pel; 716 717 /* 718 * According to Synopsys Databook, if parameter is 719 * greater than 125, a value of zero should be 720 * programmed in the register. 721 */ 722 if (param > 125) 723 param = 0; 724 725 /* now that we have the time, issue DGCMD Set Sel */ 726 ret = dwc3_send_gadget_generic_command(dwc, 727 DWC3_DGCMD_SET_PERIODIC_PAR, param); 728 WARN_ON(ret < 0); 729 } 730 731 static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 732 { 733 struct dwc3_ep *dep; 734 enum usb_device_state state = dwc->gadget->state; 735 u16 wLength; 736 737 if (state == USB_STATE_DEFAULT) 738 return -EINVAL; 739 740 wLength = le16_to_cpu(ctrl->wLength); 741 742 if (wLength != 6) { 743 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n", 744 wLength); 745 return -EINVAL; 746 } 747 748 /* 749 * To handle Set SEL we need to receive 6 bytes from Host. So let's 750 * queue a usb_request for 6 bytes. 751 * 752 * Remember, though, this controller can't handle non-wMaxPacketSize 753 * aligned transfers on the OUT direction, so we queue a request for 754 * wMaxPacketSize instead. 755 */ 756 dep = dwc->eps[0]; 757 dwc->ep0_usb_req.dep = dep; 758 dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket; 759 dwc->ep0_usb_req.request.buf = dwc->setup_buf; 760 dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl; 761 762 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req); 763 } 764 765 static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 766 { 767 u16 wLength; 768 u16 wValue; 769 u16 wIndex; 770 771 wValue = le16_to_cpu(ctrl->wValue); 772 wLength = le16_to_cpu(ctrl->wLength); 773 wIndex = le16_to_cpu(ctrl->wIndex); 774 775 if (wIndex || wLength) 776 return -EINVAL; 777 778 dwc->gadget->isoch_delay = wValue; 779 780 return 0; 781 } 782 783 static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 784 { 785 int ret; 786 787 switch (ctrl->bRequest) { 788 case USB_REQ_GET_STATUS: 789 ret = dwc3_ep0_handle_status(dwc, ctrl); 790 break; 791 case USB_REQ_CLEAR_FEATURE: 792 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0); 793 break; 794 case USB_REQ_SET_FEATURE: 795 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1); 796 break; 797 case USB_REQ_SET_ADDRESS: 798 ret = dwc3_ep0_set_address(dwc, ctrl); 799 break; 800 case USB_REQ_SET_CONFIGURATION: 801 ret = dwc3_ep0_set_config(dwc, ctrl); 802 break; 803 case USB_REQ_SET_SEL: 804 ret = dwc3_ep0_set_sel(dwc, ctrl); 805 break; 806 case USB_REQ_SET_ISOCH_DELAY: 807 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl); 808 break; 809 default: 810 ret = dwc3_ep0_delegate_req(dwc, ctrl); 811 break; 812 } 813 814 return ret; 815 } 816 817 static void dwc3_ep0_inspect_setup(struct dwc3 *dwc, 818 const struct dwc3_event_depevt *event) 819 { 820 struct usb_ctrlrequest *ctrl = (void *) dwc->ep0_trb; 821 int ret = -EINVAL; 822 u32 len; 823 824 if (!dwc->gadget_driver || !dwc->softconnect || !dwc->connected) 825 goto out; 826 827 trace_dwc3_ctrl_req(ctrl); 828 829 len = le16_to_cpu(ctrl->wLength); 830 if (!len) { 831 dwc->three_stage_setup = false; 832 dwc->ep0_expect_in = false; 833 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS; 834 } else { 835 dwc->three_stage_setup = true; 836 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN); 837 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA; 838 } 839 840 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) 841 ret = dwc3_ep0_std_request(dwc, ctrl); 842 else 843 ret = dwc3_ep0_delegate_req(dwc, ctrl); 844 845 if (ret == USB_GADGET_DELAYED_STATUS) 846 dwc->delayed_status = true; 847 848 out: 849 if (ret < 0) 850 dwc3_ep0_stall_and_restart(dwc); 851 } 852 853 static void dwc3_ep0_complete_data(struct dwc3 *dwc, 854 const struct dwc3_event_depevt *event) 855 { 856 struct dwc3_request *r; 857 struct usb_request *ur; 858 struct dwc3_trb *trb; 859 struct dwc3_ep *ep0; 860 u32 transferred = 0; 861 u32 status; 862 u32 length; 863 u8 epnum; 864 865 epnum = event->endpoint_number; 866 ep0 = dwc->eps[0]; 867 868 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS; 869 trb = dwc->ep0_trb; 870 trace_dwc3_complete_trb(ep0, trb); 871 872 r = next_request(&ep0->pending_list); 873 if (!r) 874 return; 875 876 status = DWC3_TRB_SIZE_TRBSTS(trb->size); 877 if (status == DWC3_TRBSTS_SETUP_PENDING) { 878 dwc->setup_packet_pending = true; 879 if (r) 880 dwc3_gadget_giveback(ep0, r, -ECONNRESET); 881 882 return; 883 } 884 885 ur = &r->request; 886 887 length = trb->size & DWC3_TRB_SIZE_MASK; 888 transferred = ur->length - length; 889 ur->actual += transferred; 890 891 if ((IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) && 892 ur->length && ur->zero) || dwc->ep0_bounced) { 893 trb++; 894 trb->ctrl &= ~DWC3_TRB_CTRL_HWO; 895 trace_dwc3_complete_trb(ep0, trb); 896 897 if (r->direction) 898 dwc->eps[1]->trb_enqueue = 0; 899 else 900 dwc->eps[0]->trb_enqueue = 0; 901 902 dwc->ep0_bounced = false; 903 } 904 905 if ((epnum & 1) && ur->actual < ur->length) 906 dwc3_ep0_stall_and_restart(dwc); 907 else 908 dwc3_gadget_giveback(ep0, r, 0); 909 } 910 911 static void dwc3_ep0_complete_status(struct dwc3 *dwc, 912 const struct dwc3_event_depevt *event) 913 { 914 struct dwc3_request *r; 915 struct dwc3_ep *dep; 916 struct dwc3_trb *trb; 917 u32 status; 918 919 dep = dwc->eps[0]; 920 trb = dwc->ep0_trb; 921 922 trace_dwc3_complete_trb(dep, trb); 923 924 if (!list_empty(&dep->pending_list)) { 925 r = next_request(&dep->pending_list); 926 927 dwc3_gadget_giveback(dep, r, 0); 928 } 929 930 if (dwc->test_mode) { 931 int ret; 932 933 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr); 934 if (ret < 0) { 935 dev_err(dwc->dev, "invalid test #%d\n", 936 dwc->test_mode_nr); 937 dwc3_ep0_stall_and_restart(dwc); 938 return; 939 } 940 } 941 942 status = DWC3_TRB_SIZE_TRBSTS(trb->size); 943 if (status == DWC3_TRBSTS_SETUP_PENDING) 944 dwc->setup_packet_pending = true; 945 946 dwc->ep0state = EP0_SETUP_PHASE; 947 dwc3_ep0_out_start(dwc); 948 } 949 950 static void dwc3_ep0_xfer_complete(struct dwc3 *dwc, 951 const struct dwc3_event_depevt *event) 952 { 953 struct dwc3_ep *dep = dwc->eps[event->endpoint_number]; 954 955 dep->flags &= ~DWC3_EP_TRANSFER_STARTED; 956 dep->resource_index = 0; 957 dwc->setup_packet_pending = false; 958 959 switch (dwc->ep0state) { 960 case EP0_SETUP_PHASE: 961 dwc3_ep0_inspect_setup(dwc, event); 962 break; 963 964 case EP0_DATA_PHASE: 965 dwc3_ep0_complete_data(dwc, event); 966 break; 967 968 case EP0_STATUS_PHASE: 969 dwc3_ep0_complete_status(dwc, event); 970 break; 971 default: 972 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state); 973 } 974 } 975 976 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc, 977 struct dwc3_ep *dep, struct dwc3_request *req) 978 { 979 unsigned int trb_length = 0; 980 int ret; 981 982 req->direction = !!dep->number; 983 984 if (req->request.length == 0) { 985 if (!req->direction) 986 trb_length = dep->endpoint.maxpacket; 987 988 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr, trb_length, 989 DWC3_TRBCTL_CONTROL_DATA, false); 990 ret = dwc3_ep0_start_trans(dep); 991 } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) 992 && (dep->number == 0)) { 993 u32 maxpacket; 994 u32 rem; 995 996 ret = usb_gadget_map_request_by_dev(dwc->sysdev, 997 &req->request, dep->number); 998 if (ret) 999 return; 1000 1001 maxpacket = dep->endpoint.maxpacket; 1002 rem = req->request.length % maxpacket; 1003 dwc->ep0_bounced = true; 1004 1005 /* prepare normal TRB */ 1006 dwc3_ep0_prepare_one_trb(dep, req->request.dma, 1007 req->request.length, 1008 DWC3_TRBCTL_CONTROL_DATA, 1009 true); 1010 1011 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1]; 1012 1013 /* Now prepare one extra TRB to align transfer size */ 1014 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr, 1015 maxpacket - rem, 1016 DWC3_TRBCTL_CONTROL_DATA, 1017 false); 1018 ret = dwc3_ep0_start_trans(dep); 1019 } else if (IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) && 1020 req->request.length && req->request.zero) { 1021 1022 ret = usb_gadget_map_request_by_dev(dwc->sysdev, 1023 &req->request, dep->number); 1024 if (ret) 1025 return; 1026 1027 /* prepare normal TRB */ 1028 dwc3_ep0_prepare_one_trb(dep, req->request.dma, 1029 req->request.length, 1030 DWC3_TRBCTL_CONTROL_DATA, 1031 true); 1032 1033 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1]; 1034 1035 if (!req->direction) 1036 trb_length = dep->endpoint.maxpacket; 1037 1038 /* Now prepare one extra TRB to align transfer size */ 1039 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr, 1040 trb_length, DWC3_TRBCTL_CONTROL_DATA, 1041 false); 1042 ret = dwc3_ep0_start_trans(dep); 1043 } else { 1044 ret = usb_gadget_map_request_by_dev(dwc->sysdev, 1045 &req->request, dep->number); 1046 if (ret) 1047 return; 1048 1049 dwc3_ep0_prepare_one_trb(dep, req->request.dma, 1050 req->request.length, DWC3_TRBCTL_CONTROL_DATA, 1051 false); 1052 1053 req->trb = &dwc->ep0_trb[dep->trb_enqueue]; 1054 1055 ret = dwc3_ep0_start_trans(dep); 1056 } 1057 1058 WARN_ON(ret < 0); 1059 } 1060 1061 static int dwc3_ep0_start_control_status(struct dwc3_ep *dep) 1062 { 1063 struct dwc3 *dwc = dep->dwc; 1064 u32 type; 1065 1066 type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3 1067 : DWC3_TRBCTL_CONTROL_STATUS2; 1068 1069 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 0, type, false); 1070 return dwc3_ep0_start_trans(dep); 1071 } 1072 1073 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep) 1074 { 1075 WARN_ON(dwc3_ep0_start_control_status(dep)); 1076 } 1077 1078 static void dwc3_ep0_do_control_status(struct dwc3 *dwc, 1079 const struct dwc3_event_depevt *event) 1080 { 1081 struct dwc3_ep *dep = dwc->eps[event->endpoint_number]; 1082 1083 __dwc3_ep0_do_control_status(dwc, dep); 1084 } 1085 1086 void dwc3_ep0_send_delayed_status(struct dwc3 *dwc) 1087 { 1088 unsigned int direction = !dwc->ep0_expect_in; 1089 1090 dwc->delayed_status = false; 1091 dwc->clear_stall_protocol = 0; 1092 1093 if (dwc->ep0state != EP0_STATUS_PHASE) 1094 return; 1095 1096 __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]); 1097 } 1098 1099 void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep) 1100 { 1101 struct dwc3_gadget_ep_cmd_params params; 1102 u32 cmd; 1103 int ret; 1104 1105 /* 1106 * For status/DATA OUT stage, TRB will be queued on ep0 out 1107 * endpoint for which resource index is zero. Hence allow 1108 * queuing ENDXFER command for ep0 out endpoint. 1109 */ 1110 if (!dep->resource_index && dep->number) 1111 return; 1112 1113 cmd = DWC3_DEPCMD_ENDTRANSFER; 1114 cmd |= DWC3_DEPCMD_CMDIOC; 1115 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index); 1116 memset(¶ms, 0, sizeof(params)); 1117 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); 1118 WARN_ON_ONCE(ret); 1119 dep->resource_index = 0; 1120 } 1121 1122 static void dwc3_ep0_xfernotready(struct dwc3 *dwc, 1123 const struct dwc3_event_depevt *event) 1124 { 1125 switch (event->status) { 1126 case DEPEVT_STATUS_CONTROL_DATA: 1127 if (!dwc->softconnect || !dwc->connected) 1128 return; 1129 /* 1130 * We already have a DATA transfer in the controller's cache, 1131 * if we receive a XferNotReady(DATA) we will ignore it, unless 1132 * it's for the wrong direction. 1133 * 1134 * In that case, we must issue END_TRANSFER command to the Data 1135 * Phase we already have started and issue SetStall on the 1136 * control endpoint. 1137 */ 1138 if (dwc->ep0_expect_in != event->endpoint_number) { 1139 struct dwc3_ep *dep = dwc->eps[dwc->ep0_expect_in]; 1140 1141 dev_err(dwc->dev, "unexpected direction for Data Phase\n"); 1142 dwc3_ep0_end_control_data(dwc, dep); 1143 dwc3_ep0_stall_and_restart(dwc); 1144 return; 1145 } 1146 1147 break; 1148 1149 case DEPEVT_STATUS_CONTROL_STATUS: 1150 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS) 1151 return; 1152 1153 if (dwc->setup_packet_pending) { 1154 dwc3_ep0_stall_and_restart(dwc); 1155 return; 1156 } 1157 1158 dwc->ep0state = EP0_STATUS_PHASE; 1159 1160 if (dwc->delayed_status) { 1161 struct dwc3_ep *dep = dwc->eps[0]; 1162 1163 WARN_ON_ONCE(event->endpoint_number != 1); 1164 /* 1165 * We should handle the delay STATUS phase here if the 1166 * request for handling delay STATUS has been queued 1167 * into the list. 1168 */ 1169 if (!list_empty(&dep->pending_list)) { 1170 dwc->delayed_status = false; 1171 usb_gadget_set_state(dwc->gadget, 1172 USB_STATE_CONFIGURED); 1173 dwc3_ep0_do_control_status(dwc, event); 1174 } 1175 1176 return; 1177 } 1178 1179 dwc3_ep0_do_control_status(dwc, event); 1180 } 1181 } 1182 1183 void dwc3_ep0_interrupt(struct dwc3 *dwc, 1184 const struct dwc3_event_depevt *event) 1185 { 1186 struct dwc3_ep *dep = dwc->eps[event->endpoint_number]; 1187 u8 cmd; 1188 1189 switch (event->endpoint_event) { 1190 case DWC3_DEPEVT_XFERCOMPLETE: 1191 dwc3_ep0_xfer_complete(dwc, event); 1192 break; 1193 1194 case DWC3_DEPEVT_XFERNOTREADY: 1195 dwc3_ep0_xfernotready(dwc, event); 1196 break; 1197 1198 case DWC3_DEPEVT_XFERINPROGRESS: 1199 case DWC3_DEPEVT_RXTXFIFOEVT: 1200 case DWC3_DEPEVT_STREAMEVT: 1201 break; 1202 case DWC3_DEPEVT_EPCMDCMPLT: 1203 cmd = DEPEVT_PARAMETER_CMD(event->parameters); 1204 1205 if (cmd == DWC3_DEPCMD_ENDTRANSFER) { 1206 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING; 1207 dep->flags &= ~DWC3_EP_TRANSFER_STARTED; 1208 } 1209 break; 1210 } 1211 } 1212