1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ep0.c - DesignWare USB3 DRD Controller Endpoint 0 Handling 4 * 5 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com 6 * 7 * Authors: Felipe Balbi <balbi@ti.com>, 8 * Sebastian Andrzej Siewior <bigeasy@linutronix.de> 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/spinlock.h> 14 #include <linux/platform_device.h> 15 #include <linux/pm_runtime.h> 16 #include <linux/interrupt.h> 17 #include <linux/io.h> 18 #include <linux/list.h> 19 #include <linux/dma-mapping.h> 20 21 #include <linux/usb/ch9.h> 22 #include <linux/usb/gadget.h> 23 #include <linux/usb/composite.h> 24 25 #include "core.h" 26 #include "debug.h" 27 #include "gadget.h" 28 #include "io.h" 29 30 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep); 31 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc, 32 struct dwc3_ep *dep, struct dwc3_request *req); 33 34 static void dwc3_ep0_prepare_one_trb(struct dwc3_ep *dep, 35 dma_addr_t buf_dma, u32 len, u32 type, bool chain) 36 { 37 struct dwc3_trb *trb; 38 struct dwc3 *dwc; 39 40 dwc = dep->dwc; 41 trb = &dwc->ep0_trb[dep->trb_enqueue]; 42 43 if (chain) 44 dep->trb_enqueue++; 45 46 trb->bpl = lower_32_bits(buf_dma); 47 trb->bph = upper_32_bits(buf_dma); 48 trb->size = len; 49 trb->ctrl = type; 50 51 trb->ctrl |= (DWC3_TRB_CTRL_HWO 52 | DWC3_TRB_CTRL_ISP_IMI); 53 54 if (chain) 55 trb->ctrl |= DWC3_TRB_CTRL_CHN; 56 else 57 trb->ctrl |= (DWC3_TRB_CTRL_IOC 58 | DWC3_TRB_CTRL_LST); 59 60 trace_dwc3_prepare_trb(dep, trb); 61 } 62 63 static int dwc3_ep0_start_trans(struct dwc3_ep *dep) 64 { 65 struct dwc3_gadget_ep_cmd_params params; 66 struct dwc3 *dwc; 67 int ret; 68 69 if (dep->flags & DWC3_EP_BUSY) 70 return 0; 71 72 dwc = dep->dwc; 73 74 memset(¶ms, 0, sizeof(params)); 75 params.param0 = upper_32_bits(dwc->ep0_trb_addr); 76 params.param1 = lower_32_bits(dwc->ep0_trb_addr); 77 78 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_STARTTRANSFER, ¶ms); 79 if (ret < 0) 80 return ret; 81 82 dep->flags |= DWC3_EP_BUSY; 83 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep); 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 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 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 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) { 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 static 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->ep0state = EP0_SETUP_PHASE; 245 dwc3_ep0_out_start(dwc); 246 } 247 248 int __dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value) 249 { 250 struct dwc3_ep *dep = to_dwc3_ep(ep); 251 struct dwc3 *dwc = dep->dwc; 252 253 dwc3_ep0_stall_and_restart(dwc); 254 255 return 0; 256 } 257 258 int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value) 259 { 260 struct dwc3_ep *dep = to_dwc3_ep(ep); 261 struct dwc3 *dwc = dep->dwc; 262 unsigned long flags; 263 int ret; 264 265 spin_lock_irqsave(&dwc->lock, flags); 266 ret = __dwc3_gadget_ep0_set_halt(ep, value); 267 spin_unlock_irqrestore(&dwc->lock, flags); 268 269 return ret; 270 } 271 272 void dwc3_ep0_out_start(struct dwc3 *dwc) 273 { 274 struct dwc3_ep *dep; 275 int ret; 276 277 complete(&dwc->ep0_in_setup); 278 279 dep = dwc->eps[0]; 280 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 8, 281 DWC3_TRBCTL_CONTROL_SETUP, false); 282 ret = dwc3_ep0_start_trans(dep); 283 WARN_ON(ret < 0); 284 } 285 286 static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le) 287 { 288 struct dwc3_ep *dep; 289 u32 windex = le16_to_cpu(wIndex_le); 290 u32 epnum; 291 292 epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1; 293 if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) 294 epnum |= 1; 295 296 dep = dwc->eps[epnum]; 297 if (dep->flags & DWC3_EP_ENABLED) 298 return dep; 299 300 return NULL; 301 } 302 303 static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req) 304 { 305 } 306 /* 307 * ch 9.4.5 308 */ 309 static int dwc3_ep0_handle_status(struct dwc3 *dwc, 310 struct usb_ctrlrequest *ctrl) 311 { 312 struct dwc3_ep *dep; 313 u32 recip; 314 u32 value; 315 u32 reg; 316 u16 usb_status = 0; 317 __le16 *response_pkt; 318 319 /* We don't support PTM_STATUS */ 320 value = le16_to_cpu(ctrl->wValue); 321 if (value != 0) 322 return -EINVAL; 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 u32 wValue; 483 int ret = 0; 484 485 wValue = le16_to_cpu(ctrl->wValue); 486 487 switch (wValue) { 488 case USB_INTRF_FUNC_SUSPEND: 489 /* 490 * REVISIT: Ideally we would enable some low power mode here, 491 * however it's unclear what we should be doing here. 492 * 493 * For now, we're not doing anything, just making sure we return 494 * 0 so USB Command Verifier tests pass without any errors. 495 */ 496 break; 497 default: 498 ret = -EINVAL; 499 } 500 501 return ret; 502 } 503 504 static int dwc3_ep0_handle_endpoint(struct dwc3 *dwc, 505 struct usb_ctrlrequest *ctrl, int set) 506 { 507 struct dwc3_ep *dep; 508 u32 wValue; 509 int ret; 510 511 wValue = le16_to_cpu(ctrl->wValue); 512 513 switch (wValue) { 514 case USB_ENDPOINT_HALT: 515 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex); 516 if (!dep) 517 return -EINVAL; 518 519 if (set == 0 && (dep->flags & DWC3_EP_WEDGE)) 520 break; 521 522 ret = __dwc3_gadget_ep_set_halt(dep, set, true); 523 if (ret) 524 return -EINVAL; 525 break; 526 default: 527 return -EINVAL; 528 } 529 530 return 0; 531 } 532 533 static int dwc3_ep0_handle_feature(struct dwc3 *dwc, 534 struct usb_ctrlrequest *ctrl, int set) 535 { 536 u32 recip; 537 int ret; 538 539 recip = ctrl->bRequestType & USB_RECIP_MASK; 540 541 switch (recip) { 542 case USB_RECIP_DEVICE: 543 ret = dwc3_ep0_handle_device(dwc, ctrl, set); 544 break; 545 case USB_RECIP_INTERFACE: 546 ret = dwc3_ep0_handle_intf(dwc, ctrl, set); 547 break; 548 case USB_RECIP_ENDPOINT: 549 ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set); 550 break; 551 default: 552 ret = -EINVAL; 553 } 554 555 return ret; 556 } 557 558 static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 559 { 560 enum usb_device_state state = dwc->gadget.state; 561 u32 addr; 562 u32 reg; 563 564 addr = le16_to_cpu(ctrl->wValue); 565 if (addr > 127) { 566 dev_err(dwc->dev, "invalid device address %d\n", addr); 567 return -EINVAL; 568 } 569 570 if (state == USB_STATE_CONFIGURED) { 571 dev_err(dwc->dev, "can't SetAddress() from Configured State\n"); 572 return -EINVAL; 573 } 574 575 reg = dwc3_readl(dwc->regs, DWC3_DCFG); 576 reg &= ~(DWC3_DCFG_DEVADDR_MASK); 577 reg |= DWC3_DCFG_DEVADDR(addr); 578 dwc3_writel(dwc->regs, DWC3_DCFG, reg); 579 580 if (addr) 581 usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS); 582 else 583 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT); 584 585 return 0; 586 } 587 588 static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 589 { 590 int ret; 591 592 spin_unlock(&dwc->lock); 593 ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl); 594 spin_lock(&dwc->lock); 595 return ret; 596 } 597 598 static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 599 { 600 enum usb_device_state state = dwc->gadget.state; 601 u32 cfg; 602 int ret; 603 u32 reg; 604 605 cfg = le16_to_cpu(ctrl->wValue); 606 607 switch (state) { 608 case USB_STATE_DEFAULT: 609 return -EINVAL; 610 611 case USB_STATE_ADDRESS: 612 ret = dwc3_ep0_delegate_req(dwc, ctrl); 613 /* if the cfg matches and the cfg is non zero */ 614 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) { 615 616 /* 617 * only change state if set_config has already 618 * been processed. If gadget driver returns 619 * USB_GADGET_DELAYED_STATUS, we will wait 620 * to change the state on the next usb_ep_queue() 621 */ 622 if (ret == 0) 623 usb_gadget_set_state(&dwc->gadget, 624 USB_STATE_CONFIGURED); 625 626 /* 627 * Enable transition to U1/U2 state when 628 * nothing is pending from application. 629 */ 630 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 631 reg |= (DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA); 632 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 633 } 634 break; 635 636 case USB_STATE_CONFIGURED: 637 ret = dwc3_ep0_delegate_req(dwc, ctrl); 638 if (!cfg && !ret) 639 usb_gadget_set_state(&dwc->gadget, 640 USB_STATE_ADDRESS); 641 break; 642 default: 643 ret = -EINVAL; 644 } 645 return ret; 646 } 647 648 static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req) 649 { 650 struct dwc3_ep *dep = to_dwc3_ep(ep); 651 struct dwc3 *dwc = dep->dwc; 652 653 u32 param = 0; 654 u32 reg; 655 656 struct timing { 657 u8 u1sel; 658 u8 u1pel; 659 __le16 u2sel; 660 __le16 u2pel; 661 } __packed timing; 662 663 int ret; 664 665 memcpy(&timing, req->buf, sizeof(timing)); 666 667 dwc->u1sel = timing.u1sel; 668 dwc->u1pel = timing.u1pel; 669 dwc->u2sel = le16_to_cpu(timing.u2sel); 670 dwc->u2pel = le16_to_cpu(timing.u2pel); 671 672 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 673 if (reg & DWC3_DCTL_INITU2ENA) 674 param = dwc->u2pel; 675 if (reg & DWC3_DCTL_INITU1ENA) 676 param = dwc->u1pel; 677 678 /* 679 * According to Synopsys Databook, if parameter is 680 * greater than 125, a value of zero should be 681 * programmed in the register. 682 */ 683 if (param > 125) 684 param = 0; 685 686 /* now that we have the time, issue DGCMD Set Sel */ 687 ret = dwc3_send_gadget_generic_command(dwc, 688 DWC3_DGCMD_SET_PERIODIC_PAR, param); 689 WARN_ON(ret < 0); 690 } 691 692 static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 693 { 694 struct dwc3_ep *dep; 695 enum usb_device_state state = dwc->gadget.state; 696 u16 wLength; 697 698 if (state == USB_STATE_DEFAULT) 699 return -EINVAL; 700 701 wLength = le16_to_cpu(ctrl->wLength); 702 703 if (wLength != 6) { 704 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n", 705 wLength); 706 return -EINVAL; 707 } 708 709 /* 710 * To handle Set SEL we need to receive 6 bytes from Host. So let's 711 * queue a usb_request for 6 bytes. 712 * 713 * Remember, though, this controller can't handle non-wMaxPacketSize 714 * aligned transfers on the OUT direction, so we queue a request for 715 * wMaxPacketSize instead. 716 */ 717 dep = dwc->eps[0]; 718 dwc->ep0_usb_req.dep = dep; 719 dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket; 720 dwc->ep0_usb_req.request.buf = dwc->setup_buf; 721 dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl; 722 723 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req); 724 } 725 726 static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 727 { 728 u16 wLength; 729 u16 wValue; 730 u16 wIndex; 731 732 wValue = le16_to_cpu(ctrl->wValue); 733 wLength = le16_to_cpu(ctrl->wLength); 734 wIndex = le16_to_cpu(ctrl->wIndex); 735 736 if (wIndex || wLength) 737 return -EINVAL; 738 739 /* 740 * REVISIT It's unclear from Databook what to do with this 741 * value. For now, just cache it. 742 */ 743 dwc->isoch_delay = wValue; 744 745 return 0; 746 } 747 748 static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) 749 { 750 int ret; 751 752 switch (ctrl->bRequest) { 753 case USB_REQ_GET_STATUS: 754 ret = dwc3_ep0_handle_status(dwc, ctrl); 755 break; 756 case USB_REQ_CLEAR_FEATURE: 757 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0); 758 break; 759 case USB_REQ_SET_FEATURE: 760 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1); 761 break; 762 case USB_REQ_SET_ADDRESS: 763 ret = dwc3_ep0_set_address(dwc, ctrl); 764 break; 765 case USB_REQ_SET_CONFIGURATION: 766 ret = dwc3_ep0_set_config(dwc, ctrl); 767 break; 768 case USB_REQ_SET_SEL: 769 ret = dwc3_ep0_set_sel(dwc, ctrl); 770 break; 771 case USB_REQ_SET_ISOCH_DELAY: 772 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl); 773 break; 774 default: 775 ret = dwc3_ep0_delegate_req(dwc, ctrl); 776 break; 777 } 778 779 return ret; 780 } 781 782 static void dwc3_ep0_inspect_setup(struct dwc3 *dwc, 783 const struct dwc3_event_depevt *event) 784 { 785 struct usb_ctrlrequest *ctrl = (void *) dwc->ep0_trb; 786 int ret = -EINVAL; 787 u32 len; 788 789 if (!dwc->gadget_driver) 790 goto out; 791 792 trace_dwc3_ctrl_req(ctrl); 793 794 len = le16_to_cpu(ctrl->wLength); 795 if (!len) { 796 dwc->three_stage_setup = false; 797 dwc->ep0_expect_in = false; 798 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS; 799 } else { 800 dwc->three_stage_setup = true; 801 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN); 802 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA; 803 } 804 805 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) 806 ret = dwc3_ep0_std_request(dwc, ctrl); 807 else 808 ret = dwc3_ep0_delegate_req(dwc, ctrl); 809 810 if (ret == USB_GADGET_DELAYED_STATUS) 811 dwc->delayed_status = true; 812 813 out: 814 if (ret < 0) 815 dwc3_ep0_stall_and_restart(dwc); 816 } 817 818 static void dwc3_ep0_complete_data(struct dwc3 *dwc, 819 const struct dwc3_event_depevt *event) 820 { 821 struct dwc3_request *r = NULL; 822 struct usb_request *ur; 823 struct dwc3_trb *trb; 824 struct dwc3_ep *ep0; 825 u32 transferred = 0; 826 u32 status; 827 u32 length; 828 u8 epnum; 829 830 epnum = event->endpoint_number; 831 ep0 = dwc->eps[0]; 832 833 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS; 834 trb = dwc->ep0_trb; 835 trace_dwc3_complete_trb(ep0, trb); 836 837 r = next_request(&ep0->pending_list); 838 if (!r) 839 return; 840 841 status = DWC3_TRB_SIZE_TRBSTS(trb->size); 842 if (status == DWC3_TRBSTS_SETUP_PENDING) { 843 dwc->setup_packet_pending = true; 844 if (r) 845 dwc3_gadget_giveback(ep0, r, -ECONNRESET); 846 847 return; 848 } 849 850 ur = &r->request; 851 852 length = trb->size & DWC3_TRB_SIZE_MASK; 853 transferred = ur->length - length; 854 ur->actual += transferred; 855 856 if ((IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) && 857 ur->length && ur->zero) || dwc->ep0_bounced) { 858 trb++; 859 trb->ctrl &= ~DWC3_TRB_CTRL_HWO; 860 trace_dwc3_complete_trb(ep0, trb); 861 ep0->trb_enqueue = 0; 862 dwc->ep0_bounced = false; 863 } 864 865 if ((epnum & 1) && ur->actual < ur->length) 866 dwc3_ep0_stall_and_restart(dwc); 867 else 868 dwc3_gadget_giveback(ep0, r, 0); 869 } 870 871 static void dwc3_ep0_complete_status(struct dwc3 *dwc, 872 const struct dwc3_event_depevt *event) 873 { 874 struct dwc3_request *r; 875 struct dwc3_ep *dep; 876 struct dwc3_trb *trb; 877 u32 status; 878 879 dep = dwc->eps[0]; 880 trb = dwc->ep0_trb; 881 882 trace_dwc3_complete_trb(dep, trb); 883 884 if (!list_empty(&dep->pending_list)) { 885 r = next_request(&dep->pending_list); 886 887 dwc3_gadget_giveback(dep, r, 0); 888 } 889 890 if (dwc->test_mode) { 891 int ret; 892 893 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr); 894 if (ret < 0) { 895 dev_err(dwc->dev, "invalid test #%d\n", 896 dwc->test_mode_nr); 897 dwc3_ep0_stall_and_restart(dwc); 898 return; 899 } 900 } 901 902 status = DWC3_TRB_SIZE_TRBSTS(trb->size); 903 if (status == DWC3_TRBSTS_SETUP_PENDING) 904 dwc->setup_packet_pending = true; 905 906 dwc->ep0state = EP0_SETUP_PHASE; 907 dwc3_ep0_out_start(dwc); 908 } 909 910 static void dwc3_ep0_xfer_complete(struct dwc3 *dwc, 911 const struct dwc3_event_depevt *event) 912 { 913 struct dwc3_ep *dep = dwc->eps[event->endpoint_number]; 914 915 dep->flags &= ~DWC3_EP_BUSY; 916 dep->resource_index = 0; 917 dwc->setup_packet_pending = false; 918 919 switch (dwc->ep0state) { 920 case EP0_SETUP_PHASE: 921 dwc3_ep0_inspect_setup(dwc, event); 922 break; 923 924 case EP0_DATA_PHASE: 925 dwc3_ep0_complete_data(dwc, event); 926 break; 927 928 case EP0_STATUS_PHASE: 929 dwc3_ep0_complete_status(dwc, event); 930 break; 931 default: 932 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state); 933 } 934 } 935 936 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc, 937 struct dwc3_ep *dep, struct dwc3_request *req) 938 { 939 int ret; 940 941 req->direction = !!dep->number; 942 943 if (req->request.length == 0) { 944 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 0, 945 DWC3_TRBCTL_CONTROL_DATA, false); 946 ret = dwc3_ep0_start_trans(dep); 947 } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) 948 && (dep->number == 0)) { 949 u32 maxpacket; 950 u32 rem; 951 952 ret = usb_gadget_map_request_by_dev(dwc->sysdev, 953 &req->request, dep->number); 954 if (ret) 955 return; 956 957 maxpacket = dep->endpoint.maxpacket; 958 rem = req->request.length % maxpacket; 959 dwc->ep0_bounced = true; 960 961 /* prepare normal TRB */ 962 dwc3_ep0_prepare_one_trb(dep, req->request.dma, 963 req->request.length, 964 DWC3_TRBCTL_CONTROL_DATA, 965 true); 966 967 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1]; 968 969 /* Now prepare one extra TRB to align transfer size */ 970 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr, 971 maxpacket - rem, 972 DWC3_TRBCTL_CONTROL_DATA, 973 false); 974 ret = dwc3_ep0_start_trans(dep); 975 } else if (IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) && 976 req->request.length && req->request.zero) { 977 u32 maxpacket; 978 979 ret = usb_gadget_map_request_by_dev(dwc->sysdev, 980 &req->request, dep->number); 981 if (ret) 982 return; 983 984 maxpacket = dep->endpoint.maxpacket; 985 986 /* prepare normal TRB */ 987 dwc3_ep0_prepare_one_trb(dep, req->request.dma, 988 req->request.length, 989 DWC3_TRBCTL_CONTROL_DATA, 990 true); 991 992 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1]; 993 994 /* Now prepare one extra TRB to align transfer size */ 995 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr, 996 0, DWC3_TRBCTL_CONTROL_DATA, 997 false); 998 ret = dwc3_ep0_start_trans(dep); 999 } else { 1000 ret = usb_gadget_map_request_by_dev(dwc->sysdev, 1001 &req->request, dep->number); 1002 if (ret) 1003 return; 1004 1005 dwc3_ep0_prepare_one_trb(dep, req->request.dma, 1006 req->request.length, DWC3_TRBCTL_CONTROL_DATA, 1007 false); 1008 1009 req->trb = &dwc->ep0_trb[dep->trb_enqueue]; 1010 1011 ret = dwc3_ep0_start_trans(dep); 1012 } 1013 1014 WARN_ON(ret < 0); 1015 } 1016 1017 static int dwc3_ep0_start_control_status(struct dwc3_ep *dep) 1018 { 1019 struct dwc3 *dwc = dep->dwc; 1020 u32 type; 1021 1022 type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3 1023 : DWC3_TRBCTL_CONTROL_STATUS2; 1024 1025 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 0, type, false); 1026 return dwc3_ep0_start_trans(dep); 1027 } 1028 1029 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep) 1030 { 1031 WARN_ON(dwc3_ep0_start_control_status(dep)); 1032 } 1033 1034 static void dwc3_ep0_do_control_status(struct dwc3 *dwc, 1035 const struct dwc3_event_depevt *event) 1036 { 1037 struct dwc3_ep *dep = dwc->eps[event->endpoint_number]; 1038 1039 __dwc3_ep0_do_control_status(dwc, dep); 1040 } 1041 1042 static void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep) 1043 { 1044 struct dwc3_gadget_ep_cmd_params params; 1045 u32 cmd; 1046 int ret; 1047 1048 if (!dep->resource_index) 1049 return; 1050 1051 cmd = DWC3_DEPCMD_ENDTRANSFER; 1052 cmd |= DWC3_DEPCMD_CMDIOC; 1053 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index); 1054 memset(¶ms, 0, sizeof(params)); 1055 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); 1056 WARN_ON_ONCE(ret); 1057 dep->resource_index = 0; 1058 } 1059 1060 static void dwc3_ep0_xfernotready(struct dwc3 *dwc, 1061 const struct dwc3_event_depevt *event) 1062 { 1063 switch (event->status) { 1064 case DEPEVT_STATUS_CONTROL_DATA: 1065 /* 1066 * We already have a DATA transfer in the controller's cache, 1067 * if we receive a XferNotReady(DATA) we will ignore it, unless 1068 * it's for the wrong direction. 1069 * 1070 * In that case, we must issue END_TRANSFER command to the Data 1071 * Phase we already have started and issue SetStall on the 1072 * control endpoint. 1073 */ 1074 if (dwc->ep0_expect_in != event->endpoint_number) { 1075 struct dwc3_ep *dep = dwc->eps[dwc->ep0_expect_in]; 1076 1077 dev_err(dwc->dev, "unexpected direction for Data Phase\n"); 1078 dwc3_ep0_end_control_data(dwc, dep); 1079 dwc3_ep0_stall_and_restart(dwc); 1080 return; 1081 } 1082 1083 break; 1084 1085 case DEPEVT_STATUS_CONTROL_STATUS: 1086 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS) 1087 return; 1088 1089 dwc->ep0state = EP0_STATUS_PHASE; 1090 1091 if (dwc->delayed_status) { 1092 struct dwc3_ep *dep = dwc->eps[0]; 1093 1094 WARN_ON_ONCE(event->endpoint_number != 1); 1095 /* 1096 * We should handle the delay STATUS phase here if the 1097 * request for handling delay STATUS has been queued 1098 * into the list. 1099 */ 1100 if (!list_empty(&dep->pending_list)) { 1101 dwc->delayed_status = false; 1102 usb_gadget_set_state(&dwc->gadget, 1103 USB_STATE_CONFIGURED); 1104 dwc3_ep0_do_control_status(dwc, event); 1105 } 1106 1107 return; 1108 } 1109 1110 dwc3_ep0_do_control_status(dwc, event); 1111 } 1112 } 1113 1114 void dwc3_ep0_interrupt(struct dwc3 *dwc, 1115 const struct dwc3_event_depevt *event) 1116 { 1117 switch (event->endpoint_event) { 1118 case DWC3_DEPEVT_XFERCOMPLETE: 1119 dwc3_ep0_xfer_complete(dwc, event); 1120 break; 1121 1122 case DWC3_DEPEVT_XFERNOTREADY: 1123 dwc3_ep0_xfernotready(dwc, event); 1124 break; 1125 1126 case DWC3_DEPEVT_XFERINPROGRESS: 1127 case DWC3_DEPEVT_RXTXFIFOEVT: 1128 case DWC3_DEPEVT_STREAMEVT: 1129 case DWC3_DEPEVT_EPCMDCMPLT: 1130 break; 1131 } 1132 } 1133