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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
30static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
31static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
32 struct dwc3_ep *dep, struct dwc3_request *req);
33static int dwc3_ep0_delegate_req(struct dwc3 *dwc,
34 struct usb_ctrlrequest *ctrl);
35
36static 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
65static 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
89static 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 issuing 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
190int 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
217out:
218 spin_unlock_irqrestore(&dwc->lock, flags);
219
220 return ret;
221}
222
223void 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_RESOURCE_ALLOCATED;
230 dep->flags |= DWC3_EP_ENABLED;
231
232 /* stall is always issued on EP0 */
233 dep = dwc->eps[0];
234 __dwc3_gadget_ep_set_halt(dep, 1, false);
235 dep->flags &= DWC3_EP_RESOURCE_ALLOCATED | DWC3_EP_TRANSFER_STARTED;
236 dep->flags |= DWC3_EP_ENABLED;
237 dwc->delayed_status = false;
238
239 if (!list_empty(&dep->pending_list)) {
240 struct dwc3_request *req;
241
242 req = next_request(&dep->pending_list);
243 if (!dwc->connected)
244 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
245 else
246 dwc3_gadget_giveback(dep, req, -ECONNRESET);
247 }
248
249 dwc->eps[0]->trb_enqueue = 0;
250 dwc->eps[1]->trb_enqueue = 0;
251 dwc->ep0state = EP0_SETUP_PHASE;
252 dwc3_ep0_out_start(dwc);
253}
254
255int __dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
256{
257 struct dwc3_ep *dep = to_dwc3_ep(ep);
258 struct dwc3 *dwc = dep->dwc;
259
260 dwc3_ep0_stall_and_restart(dwc);
261
262 return 0;
263}
264
265int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
266{
267 struct dwc3_ep *dep = to_dwc3_ep(ep);
268 struct dwc3 *dwc = dep->dwc;
269 unsigned long flags;
270 int ret;
271
272 spin_lock_irqsave(&dwc->lock, flags);
273 ret = __dwc3_gadget_ep0_set_halt(ep, value);
274 spin_unlock_irqrestore(&dwc->lock, flags);
275
276 return ret;
277}
278
279void dwc3_ep0_out_start(struct dwc3 *dwc)
280{
281 struct dwc3_ep *dep;
282 int ret;
283 int i;
284
285 complete(&dwc->ep0_in_setup);
286
287 dep = dwc->eps[0];
288 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 8,
289 DWC3_TRBCTL_CONTROL_SETUP, false);
290 ret = dwc3_ep0_start_trans(dep);
291 WARN_ON(ret < 0);
292 for (i = 2; i < DWC3_ENDPOINTS_NUM; i++) {
293 struct dwc3_ep *dwc3_ep;
294
295 dwc3_ep = dwc->eps[i];
296 if (!dwc3_ep)
297 continue;
298
299 if (!(dwc3_ep->flags & DWC3_EP_DELAY_STOP))
300 continue;
301
302 dwc3_ep->flags &= ~DWC3_EP_DELAY_STOP;
303 if (dwc->connected)
304 dwc3_stop_active_transfer(dwc3_ep, true, true);
305 else
306 dwc3_remove_requests(dwc, dwc3_ep, -ESHUTDOWN);
307 }
308}
309
310static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
311{
312 struct dwc3_ep *dep;
313 u32 windex = le16_to_cpu(wIndex_le);
314 u32 epnum;
315
316 epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1;
317 if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
318 epnum |= 1;
319
320 dep = dwc->eps[epnum];
321 if (dep == NULL)
322 return NULL;
323
324 if (dep->flags & DWC3_EP_ENABLED)
325 return dep;
326
327 return NULL;
328}
329
330static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
331{
332}
333/*
334 * ch 9.4.5
335 */
336static int dwc3_ep0_handle_status(struct dwc3 *dwc,
337 struct usb_ctrlrequest *ctrl)
338{
339 struct dwc3_ep *dep;
340 u32 recip;
341 u32 value;
342 u32 reg;
343 u16 usb_status = 0;
344 __le16 *response_pkt;
345
346 /* We don't support PTM_STATUS */
347 value = le16_to_cpu(ctrl->wValue);
348 if (value != 0)
349 return -EINVAL;
350
351 recip = ctrl->bRequestType & USB_RECIP_MASK;
352 switch (recip) {
353 case USB_RECIP_DEVICE:
354 /*
355 * LTM will be set once we know how to set this in HW.
356 */
357 usb_status |= dwc->gadget->is_selfpowered;
358
359 if ((dwc->speed == DWC3_DSTS_SUPERSPEED) ||
360 (dwc->speed == DWC3_DSTS_SUPERSPEED_PLUS)) {
361 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
362 if (reg & DWC3_DCTL_INITU1ENA)
363 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
364 if (reg & DWC3_DCTL_INITU2ENA)
365 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
366 } else {
367 usb_status |= dwc->gadget->wakeup_armed <<
368 USB_DEVICE_REMOTE_WAKEUP;
369 }
370
371 break;
372
373 case USB_RECIP_INTERFACE:
374 /*
375 * Function Remote Wake Capable D0
376 * Function Remote Wakeup D1
377 */
378 return dwc3_ep0_delegate_req(dwc, ctrl);
379
380 case USB_RECIP_ENDPOINT:
381 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
382 if (!dep)
383 return -EINVAL;
384
385 if (dep->flags & DWC3_EP_STALL)
386 usb_status = 1 << USB_ENDPOINT_HALT;
387 break;
388 default:
389 return -EINVAL;
390 }
391
392 response_pkt = (__le16 *) dwc->setup_buf;
393 *response_pkt = cpu_to_le16(usb_status);
394
395 dep = dwc->eps[0];
396 dwc->ep0_usb_req.dep = dep;
397 dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
398 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
399 dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
400
401 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
402}
403
404static int dwc3_ep0_handle_u1(struct dwc3 *dwc, enum usb_device_state state,
405 int set)
406{
407 u32 reg;
408
409 if (state != USB_STATE_CONFIGURED)
410 return -EINVAL;
411 if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
412 (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
413 return -EINVAL;
414 if (set && dwc->dis_u1_entry_quirk)
415 return -EINVAL;
416
417 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
418 if (set)
419 reg |= DWC3_DCTL_INITU1ENA;
420 else
421 reg &= ~DWC3_DCTL_INITU1ENA;
422 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
423
424 return 0;
425}
426
427static int dwc3_ep0_handle_u2(struct dwc3 *dwc, enum usb_device_state state,
428 int set)
429{
430 u32 reg;
431
432
433 if (state != USB_STATE_CONFIGURED)
434 return -EINVAL;
435 if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
436 (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
437 return -EINVAL;
438 if (set && dwc->dis_u2_entry_quirk)
439 return -EINVAL;
440
441 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
442 if (set)
443 reg |= DWC3_DCTL_INITU2ENA;
444 else
445 reg &= ~DWC3_DCTL_INITU2ENA;
446 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
447
448 return 0;
449}
450
451static int dwc3_ep0_handle_test(struct dwc3 *dwc, enum usb_device_state state,
452 u32 wIndex, int set)
453{
454 if ((wIndex & 0xff) != 0)
455 return -EINVAL;
456 if (!set)
457 return -EINVAL;
458
459 switch (wIndex >> 8) {
460 case USB_TEST_J:
461 case USB_TEST_K:
462 case USB_TEST_SE0_NAK:
463 case USB_TEST_PACKET:
464 case USB_TEST_FORCE_ENABLE:
465 dwc->test_mode_nr = wIndex >> 8;
466 dwc->test_mode = true;
467 break;
468 default:
469 return -EINVAL;
470 }
471
472 return 0;
473}
474
475static int dwc3_ep0_handle_device(struct dwc3 *dwc,
476 struct usb_ctrlrequest *ctrl, int set)
477{
478 enum usb_device_state state;
479 u32 wValue;
480 u32 wIndex;
481 int ret = 0;
482
483 wValue = le16_to_cpu(ctrl->wValue);
484 wIndex = le16_to_cpu(ctrl->wIndex);
485 state = dwc->gadget->state;
486
487 switch (wValue) {
488 case USB_DEVICE_REMOTE_WAKEUP:
489 if (dwc->wakeup_configured)
490 dwc->gadget->wakeup_armed = set;
491 else
492 ret = -EINVAL;
493 break;
494 /*
495 * 9.4.1 says only for SS, in AddressState only for
496 * default control pipe
497 */
498 case USB_DEVICE_U1_ENABLE:
499 ret = dwc3_ep0_handle_u1(dwc, state, set);
500 break;
501 case USB_DEVICE_U2_ENABLE:
502 ret = dwc3_ep0_handle_u2(dwc, state, set);
503 break;
504 case USB_DEVICE_LTM_ENABLE:
505 ret = -EINVAL;
506 break;
507 case USB_DEVICE_TEST_MODE:
508 ret = dwc3_ep0_handle_test(dwc, state, wIndex, set);
509 break;
510 default:
511 ret = -EINVAL;
512 }
513
514 return ret;
515}
516
517static int dwc3_ep0_handle_intf(struct dwc3 *dwc,
518 struct usb_ctrlrequest *ctrl, int set)
519{
520 u32 wValue;
521 int ret = 0;
522
523 wValue = le16_to_cpu(ctrl->wValue);
524
525 switch (wValue) {
526 case USB_INTRF_FUNC_SUSPEND:
527 ret = dwc3_ep0_delegate_req(dwc, ctrl);
528 break;
529 default:
530 ret = -EINVAL;
531 }
532
533 return ret;
534}
535
536static int dwc3_ep0_handle_endpoint(struct dwc3 *dwc,
537 struct usb_ctrlrequest *ctrl, int set)
538{
539 struct dwc3_ep *dep;
540 u32 wValue;
541 int ret;
542
543 wValue = le16_to_cpu(ctrl->wValue);
544
545 switch (wValue) {
546 case USB_ENDPOINT_HALT:
547 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
548 if (!dep)
549 return -EINVAL;
550
551 if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
552 break;
553
554 ret = __dwc3_gadget_ep_set_halt(dep, set, true);
555 if (ret)
556 return -EINVAL;
557
558 /* ClearFeature(Halt) may need delayed status */
559 if (!set && (dep->flags & DWC3_EP_END_TRANSFER_PENDING))
560 return USB_GADGET_DELAYED_STATUS;
561
562 break;
563 default:
564 return -EINVAL;
565 }
566
567 return 0;
568}
569
570static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
571 struct usb_ctrlrequest *ctrl, int set)
572{
573 u32 recip;
574 int ret;
575
576 recip = ctrl->bRequestType & USB_RECIP_MASK;
577
578 switch (recip) {
579 case USB_RECIP_DEVICE:
580 ret = dwc3_ep0_handle_device(dwc, ctrl, set);
581 break;
582 case USB_RECIP_INTERFACE:
583 ret = dwc3_ep0_handle_intf(dwc, ctrl, set);
584 break;
585 case USB_RECIP_ENDPOINT:
586 ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set);
587 break;
588 default:
589 ret = -EINVAL;
590 }
591
592 return ret;
593}
594
595static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
596{
597 enum usb_device_state state = dwc->gadget->state;
598 u32 addr;
599 u32 reg;
600
601 addr = le16_to_cpu(ctrl->wValue);
602 if (addr > 127) {
603 dev_err(dwc->dev, "invalid device address %d\n", addr);
604 return -EINVAL;
605 }
606
607 if (state == USB_STATE_CONFIGURED) {
608 dev_err(dwc->dev, "can't SetAddress() from Configured State\n");
609 return -EINVAL;
610 }
611
612 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
613 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
614 reg |= DWC3_DCFG_DEVADDR(addr);
615 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
616
617 if (addr)
618 usb_gadget_set_state(dwc->gadget, USB_STATE_ADDRESS);
619 else
620 usb_gadget_set_state(dwc->gadget, USB_STATE_DEFAULT);
621
622 return 0;
623}
624
625static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
626{
627 int ret = -EINVAL;
628
629 if (dwc->async_callbacks) {
630 spin_unlock(&dwc->lock);
631 ret = dwc->gadget_driver->setup(dwc->gadget, ctrl);
632 spin_lock(&dwc->lock);
633 }
634 return ret;
635}
636
637static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
638{
639 enum usb_device_state state = dwc->gadget->state;
640 u32 cfg;
641 int ret;
642 u32 reg;
643
644 cfg = le16_to_cpu(ctrl->wValue);
645
646 switch (state) {
647 case USB_STATE_DEFAULT:
648 return -EINVAL;
649
650 case USB_STATE_ADDRESS:
651 dwc3_gadget_start_config(dwc, 2);
652 dwc3_gadget_clear_tx_fifos(dwc);
653
654 ret = dwc3_ep0_delegate_req(dwc, ctrl);
655 /* if the cfg matches and the cfg is non zero */
656 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
657
658 /*
659 * only change state if set_config has already
660 * been processed. If gadget driver returns
661 * USB_GADGET_DELAYED_STATUS, we will wait
662 * to change the state on the next usb_ep_queue()
663 */
664 if (ret == 0)
665 usb_gadget_set_state(dwc->gadget,
666 USB_STATE_CONFIGURED);
667
668 /*
669 * Enable transition to U1/U2 state when
670 * nothing is pending from application.
671 */
672 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
673 if (!dwc->dis_u1_entry_quirk)
674 reg |= DWC3_DCTL_ACCEPTU1ENA;
675 if (!dwc->dis_u2_entry_quirk)
676 reg |= DWC3_DCTL_ACCEPTU2ENA;
677 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
678 }
679 break;
680
681 case USB_STATE_CONFIGURED:
682 ret = dwc3_ep0_delegate_req(dwc, ctrl);
683 if (!cfg && !ret)
684 usb_gadget_set_state(dwc->gadget,
685 USB_STATE_ADDRESS);
686 break;
687 default:
688 ret = -EINVAL;
689 }
690 return ret;
691}
692
693static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
694{
695 struct dwc3_ep *dep = to_dwc3_ep(ep);
696 struct dwc3 *dwc = dep->dwc;
697
698 u32 param = 0;
699 u32 reg;
700
701 struct timing {
702 u8 u1sel;
703 u8 u1pel;
704 __le16 u2sel;
705 __le16 u2pel;
706 } __packed timing;
707
708 int ret;
709
710 memcpy(&timing, req->buf, sizeof(timing));
711
712 dwc->u1sel = timing.u1sel;
713 dwc->u1pel = timing.u1pel;
714 dwc->u2sel = le16_to_cpu(timing.u2sel);
715 dwc->u2pel = le16_to_cpu(timing.u2pel);
716
717 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
718 if (reg & DWC3_DCTL_INITU2ENA)
719 param = dwc->u2pel;
720 if (reg & DWC3_DCTL_INITU1ENA)
721 param = dwc->u1pel;
722
723 /*
724 * According to Synopsys Databook, if parameter is
725 * greater than 125, a value of zero should be
726 * programmed in the register.
727 */
728 if (param > 125)
729 param = 0;
730
731 /* now that we have the time, issue DGCMD Set Sel */
732 ret = dwc3_send_gadget_generic_command(dwc,
733 DWC3_DGCMD_SET_PERIODIC_PAR, param);
734 WARN_ON(ret < 0);
735}
736
737static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
738{
739 struct dwc3_ep *dep;
740 enum usb_device_state state = dwc->gadget->state;
741 u16 wLength;
742
743 if (state == USB_STATE_DEFAULT)
744 return -EINVAL;
745
746 wLength = le16_to_cpu(ctrl->wLength);
747
748 if (wLength != 6) {
749 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
750 wLength);
751 return -EINVAL;
752 }
753
754 /*
755 * To handle Set SEL we need to receive 6 bytes from Host. So let's
756 * queue a usb_request for 6 bytes.
757 *
758 * Remember, though, this controller can't handle non-wMaxPacketSize
759 * aligned transfers on the OUT direction, so we queue a request for
760 * wMaxPacketSize instead.
761 */
762 dep = dwc->eps[0];
763 dwc->ep0_usb_req.dep = dep;
764 dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
765 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
766 dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
767
768 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
769}
770
771static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
772{
773 u16 wLength;
774 u16 wValue;
775 u16 wIndex;
776
777 wValue = le16_to_cpu(ctrl->wValue);
778 wLength = le16_to_cpu(ctrl->wLength);
779 wIndex = le16_to_cpu(ctrl->wIndex);
780
781 if (wIndex || wLength)
782 return -EINVAL;
783
784 dwc->gadget->isoch_delay = wValue;
785
786 return 0;
787}
788
789static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
790{
791 int ret;
792
793 switch (ctrl->bRequest) {
794 case USB_REQ_GET_STATUS:
795 ret = dwc3_ep0_handle_status(dwc, ctrl);
796 break;
797 case USB_REQ_CLEAR_FEATURE:
798 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
799 break;
800 case USB_REQ_SET_FEATURE:
801 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
802 break;
803 case USB_REQ_SET_ADDRESS:
804 ret = dwc3_ep0_set_address(dwc, ctrl);
805 break;
806 case USB_REQ_SET_CONFIGURATION:
807 ret = dwc3_ep0_set_config(dwc, ctrl);
808 break;
809 case USB_REQ_SET_SEL:
810 ret = dwc3_ep0_set_sel(dwc, ctrl);
811 break;
812 case USB_REQ_SET_ISOCH_DELAY:
813 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
814 break;
815 default:
816 ret = dwc3_ep0_delegate_req(dwc, ctrl);
817 break;
818 }
819
820 return ret;
821}
822
823static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
824 const struct dwc3_event_depevt *event)
825{
826 struct usb_ctrlrequest *ctrl = (void *) dwc->ep0_trb;
827 int ret = -EINVAL;
828 u32 len;
829
830 if (!dwc->gadget_driver || !dwc->softconnect || !dwc->connected)
831 goto out;
832
833 trace_dwc3_ctrl_req(ctrl);
834
835 len = le16_to_cpu(ctrl->wLength);
836 if (!len) {
837 dwc->three_stage_setup = false;
838 dwc->ep0_expect_in = false;
839 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
840 } else {
841 dwc->three_stage_setup = true;
842 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
843 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
844 }
845
846 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
847 ret = dwc3_ep0_std_request(dwc, ctrl);
848 else
849 ret = dwc3_ep0_delegate_req(dwc, ctrl);
850
851 if (ret == USB_GADGET_DELAYED_STATUS)
852 dwc->delayed_status = true;
853
854out:
855 if (ret < 0)
856 dwc3_ep0_stall_and_restart(dwc);
857}
858
859static void dwc3_ep0_complete_data(struct dwc3 *dwc,
860 const struct dwc3_event_depevt *event)
861{
862 struct dwc3_request *r;
863 struct usb_request *ur;
864 struct dwc3_trb *trb;
865 struct dwc3_ep *ep0;
866 u32 transferred = 0;
867 u32 status;
868 u32 length;
869 u8 epnum;
870
871 epnum = event->endpoint_number;
872 ep0 = dwc->eps[0];
873
874 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
875 trb = dwc->ep0_trb;
876 trace_dwc3_complete_trb(ep0, trb);
877
878 r = next_request(&ep0->pending_list);
879 if (!r)
880 return;
881
882 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
883 if (status == DWC3_TRBSTS_SETUP_PENDING) {
884 dwc->setup_packet_pending = true;
885 if (r)
886 dwc3_gadget_giveback(ep0, r, -ECONNRESET);
887
888 return;
889 }
890
891 ur = &r->request;
892
893 length = trb->size & DWC3_TRB_SIZE_MASK;
894 transferred = ur->length - length;
895 ur->actual += transferred;
896
897 if ((IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) &&
898 ur->length && ur->zero) || dwc->ep0_bounced) {
899 trb++;
900 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
901 trace_dwc3_complete_trb(ep0, trb);
902
903 if (r->direction)
904 dwc->eps[1]->trb_enqueue = 0;
905 else
906 dwc->eps[0]->trb_enqueue = 0;
907
908 dwc->ep0_bounced = false;
909 }
910
911 if ((epnum & 1) && ur->actual < ur->length)
912 dwc3_ep0_stall_and_restart(dwc);
913 else
914 dwc3_gadget_giveback(ep0, r, 0);
915}
916
917static void dwc3_ep0_complete_status(struct dwc3 *dwc,
918 const struct dwc3_event_depevt *event)
919{
920 struct dwc3_request *r;
921 struct dwc3_ep *dep;
922 struct dwc3_trb *trb;
923 u32 status;
924
925 dep = dwc->eps[0];
926 trb = dwc->ep0_trb;
927
928 trace_dwc3_complete_trb(dep, trb);
929
930 if (!list_empty(&dep->pending_list)) {
931 r = next_request(&dep->pending_list);
932
933 dwc3_gadget_giveback(dep, r, 0);
934 }
935
936 if (dwc->test_mode) {
937 int ret;
938
939 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
940 if (ret < 0) {
941 dev_err(dwc->dev, "invalid test #%d\n",
942 dwc->test_mode_nr);
943 dwc3_ep0_stall_and_restart(dwc);
944 return;
945 }
946 }
947
948 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
949 if (status == DWC3_TRBSTS_SETUP_PENDING)
950 dwc->setup_packet_pending = true;
951
952 dwc->ep0state = EP0_SETUP_PHASE;
953 dwc3_ep0_out_start(dwc);
954}
955
956static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
957 const struct dwc3_event_depevt *event)
958{
959 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
960
961 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
962 dep->resource_index = 0;
963 dwc->setup_packet_pending = false;
964
965 switch (dwc->ep0state) {
966 case EP0_SETUP_PHASE:
967 dwc3_ep0_inspect_setup(dwc, event);
968 break;
969
970 case EP0_DATA_PHASE:
971 dwc3_ep0_complete_data(dwc, event);
972 break;
973
974 case EP0_STATUS_PHASE:
975 dwc3_ep0_complete_status(dwc, event);
976 break;
977 default:
978 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
979 }
980}
981
982static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
983 struct dwc3_ep *dep, struct dwc3_request *req)
984{
985 unsigned int trb_length = 0;
986 int ret;
987
988 req->direction = !!dep->number;
989
990 if (req->request.length == 0) {
991 if (!req->direction)
992 trb_length = dep->endpoint.maxpacket;
993
994 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr, trb_length,
995 DWC3_TRBCTL_CONTROL_DATA, false);
996 ret = dwc3_ep0_start_trans(dep);
997 } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
998 && (dep->number == 0)) {
999 u32 maxpacket;
1000 u32 rem;
1001
1002 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1003 &req->request, dep->number);
1004 if (ret)
1005 return;
1006
1007 maxpacket = dep->endpoint.maxpacket;
1008 rem = req->request.length % maxpacket;
1009 dwc->ep0_bounced = true;
1010
1011 /* prepare normal TRB */
1012 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
1013 req->request.length,
1014 DWC3_TRBCTL_CONTROL_DATA,
1015 true);
1016
1017 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1];
1018
1019 /* Now prepare one extra TRB to align transfer size */
1020 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr,
1021 maxpacket - rem,
1022 DWC3_TRBCTL_CONTROL_DATA,
1023 false);
1024 ret = dwc3_ep0_start_trans(dep);
1025 } else if (IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) &&
1026 req->request.length && req->request.zero) {
1027
1028 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1029 &req->request, dep->number);
1030 if (ret)
1031 return;
1032
1033 /* prepare normal TRB */
1034 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
1035 req->request.length,
1036 DWC3_TRBCTL_CONTROL_DATA,
1037 true);
1038
1039 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1];
1040
1041 if (!req->direction)
1042 trb_length = dep->endpoint.maxpacket;
1043
1044 /* Now prepare one extra TRB to align transfer size */
1045 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr,
1046 trb_length, DWC3_TRBCTL_CONTROL_DATA,
1047 false);
1048 ret = dwc3_ep0_start_trans(dep);
1049 } else {
1050 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1051 &req->request, dep->number);
1052 if (ret)
1053 return;
1054
1055 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
1056 req->request.length, DWC3_TRBCTL_CONTROL_DATA,
1057 false);
1058
1059 req->trb = &dwc->ep0_trb[dep->trb_enqueue];
1060
1061 ret = dwc3_ep0_start_trans(dep);
1062 }
1063
1064 WARN_ON(ret < 0);
1065}
1066
1067static int dwc3_ep0_start_control_status(struct dwc3_ep *dep)
1068{
1069 struct dwc3 *dwc = dep->dwc;
1070 u32 type;
1071
1072 type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3
1073 : DWC3_TRBCTL_CONTROL_STATUS2;
1074
1075 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 0, type, false);
1076 return dwc3_ep0_start_trans(dep);
1077}
1078
1079static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
1080{
1081 WARN_ON(dwc3_ep0_start_control_status(dep));
1082}
1083
1084static void dwc3_ep0_do_control_status(struct dwc3 *dwc,
1085 const struct dwc3_event_depevt *event)
1086{
1087 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
1088
1089 __dwc3_ep0_do_control_status(dwc, dep);
1090}
1091
1092void dwc3_ep0_send_delayed_status(struct dwc3 *dwc)
1093{
1094 unsigned int direction = !dwc->ep0_expect_in;
1095
1096 dwc->delayed_status = false;
1097 dwc->clear_stall_protocol = 0;
1098
1099 if (dwc->ep0state != EP0_STATUS_PHASE)
1100 return;
1101
1102 __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
1103}
1104
1105void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep)
1106{
1107 struct dwc3_gadget_ep_cmd_params params;
1108 u32 cmd;
1109 int ret;
1110
1111 /*
1112 * For status/DATA OUT stage, TRB will be queued on ep0 out
1113 * endpoint for which resource index is zero. Hence allow
1114 * queuing ENDXFER command for ep0 out endpoint.
1115 */
1116 if (!dep->resource_index && dep->number)
1117 return;
1118
1119 cmd = DWC3_DEPCMD_ENDTRANSFER;
1120 cmd |= DWC3_DEPCMD_CMDIOC;
1121 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1122 memset(¶ms, 0, sizeof(params));
1123 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1124 WARN_ON_ONCE(ret);
1125 dep->resource_index = 0;
1126}
1127
1128static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
1129 const struct dwc3_event_depevt *event)
1130{
1131 switch (event->status) {
1132 case DEPEVT_STATUS_CONTROL_DATA:
1133 if (!dwc->softconnect || !dwc->connected)
1134 return;
1135 /*
1136 * We already have a DATA transfer in the controller's cache,
1137 * if we receive a XferNotReady(DATA) we will ignore it, unless
1138 * it's for the wrong direction.
1139 *
1140 * In that case, we must issue END_TRANSFER command to the Data
1141 * Phase we already have started and issue SetStall on the
1142 * control endpoint.
1143 */
1144 if (dwc->ep0_expect_in != event->endpoint_number) {
1145 struct dwc3_ep *dep = dwc->eps[dwc->ep0_expect_in];
1146
1147 dev_err(dwc->dev, "unexpected direction for Data Phase\n");
1148 dwc3_ep0_end_control_data(dwc, dep);
1149 dwc3_ep0_stall_and_restart(dwc);
1150 return;
1151 }
1152
1153 break;
1154
1155 case DEPEVT_STATUS_CONTROL_STATUS:
1156 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
1157 return;
1158
1159 if (dwc->setup_packet_pending) {
1160 dwc3_ep0_stall_and_restart(dwc);
1161 return;
1162 }
1163
1164 dwc->ep0state = EP0_STATUS_PHASE;
1165
1166 if (dwc->delayed_status) {
1167 struct dwc3_ep *dep = dwc->eps[0];
1168
1169 WARN_ON_ONCE(event->endpoint_number != 1);
1170 /*
1171 * We should handle the delay STATUS phase here if the
1172 * request for handling delay STATUS has been queued
1173 * into the list.
1174 */
1175 if (!list_empty(&dep->pending_list)) {
1176 dwc->delayed_status = false;
1177 usb_gadget_set_state(dwc->gadget,
1178 USB_STATE_CONFIGURED);
1179 dwc3_ep0_do_control_status(dwc, event);
1180 }
1181
1182 return;
1183 }
1184
1185 dwc3_ep0_do_control_status(dwc, event);
1186 }
1187}
1188
1189void dwc3_ep0_interrupt(struct dwc3 *dwc,
1190 const struct dwc3_event_depevt *event)
1191{
1192 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
1193 u8 cmd;
1194
1195 switch (event->endpoint_event) {
1196 case DWC3_DEPEVT_XFERCOMPLETE:
1197 dwc3_ep0_xfer_complete(dwc, event);
1198 break;
1199
1200 case DWC3_DEPEVT_XFERNOTREADY:
1201 dwc3_ep0_xfernotready(dwc, event);
1202 break;
1203
1204 case DWC3_DEPEVT_XFERINPROGRESS:
1205 case DWC3_DEPEVT_RXTXFIFOEVT:
1206 case DWC3_DEPEVT_STREAMEVT:
1207 break;
1208 case DWC3_DEPEVT_EPCMDCMPLT:
1209 cmd = DEPEVT_PARAMETER_CMD(event->parameters);
1210
1211 if (cmd == DWC3_DEPCMD_ENDTRANSFER) {
1212 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
1213 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
1214 }
1215 break;
1216 default:
1217 dev_err(dwc->dev, "unknown endpoint event %d\n", event->endpoint_event);
1218 break;
1219 }
1220}
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
30static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
31static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
32 struct dwc3_ep *dep, struct dwc3_request *req);
33
34static 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
63static 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_TRANSFER_STARTED)
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 dwc->ep0_next_event = DWC3_EP0_COMPLETE;
83
84 return 0;
85}
86
87static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep,
88 struct dwc3_request *req)
89{
90 struct dwc3 *dwc = dep->dwc;
91
92 req->request.actual = 0;
93 req->request.status = -EINPROGRESS;
94 req->epnum = dep->number;
95
96 list_add_tail(&req->list, &dep->pending_list);
97
98 /*
99 * Gadget driver might not be quick enough to queue a request
100 * before we get a Transfer Not Ready event on this endpoint.
101 *
102 * In that case, we will set DWC3_EP_PENDING_REQUEST. When that
103 * flag is set, it's telling us that as soon as Gadget queues the
104 * required request, we should kick the transfer here because the
105 * IRQ we were waiting for is long gone.
106 */
107 if (dep->flags & DWC3_EP_PENDING_REQUEST) {
108 unsigned direction;
109
110 direction = !!(dep->flags & DWC3_EP0_DIR_IN);
111
112 if (dwc->ep0state != EP0_DATA_PHASE) {
113 dev_WARN(dwc->dev, "Unexpected pending request\n");
114 return 0;
115 }
116
117 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
118
119 dep->flags &= ~(DWC3_EP_PENDING_REQUEST |
120 DWC3_EP0_DIR_IN);
121
122 return 0;
123 }
124
125 /*
126 * In case gadget driver asked us to delay the STATUS phase,
127 * handle it here.
128 */
129 if (dwc->delayed_status) {
130 unsigned direction;
131
132 direction = !dwc->ep0_expect_in;
133 dwc->delayed_status = false;
134 usb_gadget_set_state(&dwc->gadget, USB_STATE_CONFIGURED);
135
136 if (dwc->ep0state == EP0_STATUS_PHASE)
137 __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
138
139 return 0;
140 }
141
142 /*
143 * Unfortunately we have uncovered a limitation wrt the Data Phase.
144 *
145 * Section 9.4 says we can wait for the XferNotReady(DATA) event to
146 * come before issueing Start Transfer command, but if we do, we will
147 * miss situations where the host starts another SETUP phase instead of
148 * the DATA phase. Such cases happen at least on TD.7.6 of the Link
149 * Layer Compliance Suite.
150 *
151 * The problem surfaces due to the fact that in case of back-to-back
152 * SETUP packets there will be no XferNotReady(DATA) generated and we
153 * will be stuck waiting for XferNotReady(DATA) forever.
154 *
155 * By looking at tables 9-13 and 9-14 of the Databook, we can see that
156 * it tells us to start Data Phase right away. It also mentions that if
157 * we receive a SETUP phase instead of the DATA phase, core will issue
158 * XferComplete for the DATA phase, before actually initiating it in
159 * the wire, with the TRB's status set to "SETUP_PENDING". Such status
160 * can only be used to print some debugging logs, as the core expects
161 * us to go through to the STATUS phase and start a CONTROL_STATUS TRB,
162 * just so it completes right away, without transferring anything and,
163 * only then, we can go back to the SETUP phase.
164 *
165 * Because of this scenario, SNPS decided to change the programming
166 * model of control transfers and support on-demand transfers only for
167 * the STATUS phase. To fix the issue we have now, we will always wait
168 * for gadget driver to queue the DATA phase's struct usb_request, then
169 * start it right away.
170 *
171 * If we're actually in a 2-stage transfer, we will wait for
172 * XferNotReady(STATUS).
173 */
174 if (dwc->three_stage_setup) {
175 unsigned direction;
176
177 direction = dwc->ep0_expect_in;
178 dwc->ep0state = EP0_DATA_PHASE;
179
180 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
181
182 dep->flags &= ~DWC3_EP0_DIR_IN;
183 }
184
185 return 0;
186}
187
188int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
189 gfp_t gfp_flags)
190{
191 struct dwc3_request *req = to_dwc3_request(request);
192 struct dwc3_ep *dep = to_dwc3_ep(ep);
193 struct dwc3 *dwc = dep->dwc;
194
195 unsigned long flags;
196
197 int ret;
198
199 spin_lock_irqsave(&dwc->lock, flags);
200 if (!dep->endpoint.desc) {
201 dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
202 dep->name);
203 ret = -ESHUTDOWN;
204 goto out;
205 }
206
207 /* we share one TRB for ep0/1 */
208 if (!list_empty(&dep->pending_list)) {
209 ret = -EBUSY;
210 goto out;
211 }
212
213 ret = __dwc3_gadget_ep0_queue(dep, req);
214
215out:
216 spin_unlock_irqrestore(&dwc->lock, flags);
217
218 return ret;
219}
220
221static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
222{
223 struct dwc3_ep *dep;
224
225 /* reinitialize physical ep1 */
226 dep = dwc->eps[1];
227 dep->flags = DWC3_EP_ENABLED;
228
229 /* stall is always issued on EP0 */
230 dep = dwc->eps[0];
231 __dwc3_gadget_ep_set_halt(dep, 1, false);
232 dep->flags = DWC3_EP_ENABLED;
233 dwc->delayed_status = false;
234
235 if (!list_empty(&dep->pending_list)) {
236 struct dwc3_request *req;
237
238 req = next_request(&dep->pending_list);
239 dwc3_gadget_giveback(dep, req, -ECONNRESET);
240 }
241
242 dwc->ep0state = EP0_SETUP_PHASE;
243 dwc3_ep0_out_start(dwc);
244}
245
246int __dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
247{
248 struct dwc3_ep *dep = to_dwc3_ep(ep);
249 struct dwc3 *dwc = dep->dwc;
250
251 dwc3_ep0_stall_and_restart(dwc);
252
253 return 0;
254}
255
256int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
257{
258 struct dwc3_ep *dep = to_dwc3_ep(ep);
259 struct dwc3 *dwc = dep->dwc;
260 unsigned long flags;
261 int ret;
262
263 spin_lock_irqsave(&dwc->lock, flags);
264 ret = __dwc3_gadget_ep0_set_halt(ep, value);
265 spin_unlock_irqrestore(&dwc->lock, flags);
266
267 return ret;
268}
269
270void dwc3_ep0_out_start(struct dwc3 *dwc)
271{
272 struct dwc3_ep *dep;
273 int ret;
274
275 complete(&dwc->ep0_in_setup);
276
277 dep = dwc->eps[0];
278 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 8,
279 DWC3_TRBCTL_CONTROL_SETUP, false);
280 ret = dwc3_ep0_start_trans(dep);
281 WARN_ON(ret < 0);
282}
283
284static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
285{
286 struct dwc3_ep *dep;
287 u32 windex = le16_to_cpu(wIndex_le);
288 u32 epnum;
289
290 epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1;
291 if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
292 epnum |= 1;
293
294 dep = dwc->eps[epnum];
295 if (dep->flags & DWC3_EP_ENABLED)
296 return dep;
297
298 return NULL;
299}
300
301static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
302{
303}
304/*
305 * ch 9.4.5
306 */
307static int dwc3_ep0_handle_status(struct dwc3 *dwc,
308 struct usb_ctrlrequest *ctrl)
309{
310 struct dwc3_ep *dep;
311 u32 recip;
312 u32 value;
313 u32 reg;
314 u16 usb_status = 0;
315 __le16 *response_pkt;
316
317 /* We don't support PTM_STATUS */
318 value = le16_to_cpu(ctrl->wValue);
319 if (value != 0)
320 return -EINVAL;
321
322 recip = ctrl->bRequestType & USB_RECIP_MASK;
323 switch (recip) {
324 case USB_RECIP_DEVICE:
325 /*
326 * LTM will be set once we know how to set this in HW.
327 */
328 usb_status |= dwc->gadget.is_selfpowered;
329
330 if ((dwc->speed == DWC3_DSTS_SUPERSPEED) ||
331 (dwc->speed == DWC3_DSTS_SUPERSPEED_PLUS)) {
332 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
333 if (reg & DWC3_DCTL_INITU1ENA)
334 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
335 if (reg & DWC3_DCTL_INITU2ENA)
336 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
337 }
338
339 break;
340
341 case USB_RECIP_INTERFACE:
342 /*
343 * Function Remote Wake Capable D0
344 * Function Remote Wakeup D1
345 */
346 break;
347
348 case USB_RECIP_ENDPOINT:
349 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
350 if (!dep)
351 return -EINVAL;
352
353 if (dep->flags & DWC3_EP_STALL)
354 usb_status = 1 << USB_ENDPOINT_HALT;
355 break;
356 default:
357 return -EINVAL;
358 }
359
360 response_pkt = (__le16 *) dwc->setup_buf;
361 *response_pkt = cpu_to_le16(usb_status);
362
363 dep = dwc->eps[0];
364 dwc->ep0_usb_req.dep = dep;
365 dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
366 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
367 dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
368
369 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
370}
371
372static int dwc3_ep0_handle_u1(struct dwc3 *dwc, enum usb_device_state state,
373 int set)
374{
375 u32 reg;
376
377 if (state != USB_STATE_CONFIGURED)
378 return -EINVAL;
379 if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
380 (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
381 return -EINVAL;
382 if (set && dwc->dis_u1_entry_quirk)
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
395static 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 if (set && dwc->dis_u2_entry_quirk)
407 return -EINVAL;
408
409 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
410 if (set)
411 reg |= DWC3_DCTL_INITU2ENA;
412 else
413 reg &= ~DWC3_DCTL_INITU2ENA;
414 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
415
416 return 0;
417}
418
419static int dwc3_ep0_handle_test(struct dwc3 *dwc, enum usb_device_state state,
420 u32 wIndex, int set)
421{
422 if ((wIndex & 0xff) != 0)
423 return -EINVAL;
424 if (!set)
425 return -EINVAL;
426
427 switch (wIndex >> 8) {
428 case USB_TEST_J:
429 case USB_TEST_K:
430 case USB_TEST_SE0_NAK:
431 case USB_TEST_PACKET:
432 case USB_TEST_FORCE_ENABLE:
433 dwc->test_mode_nr = wIndex >> 8;
434 dwc->test_mode = true;
435 break;
436 default:
437 return -EINVAL;
438 }
439
440 return 0;
441}
442
443static int dwc3_ep0_handle_device(struct dwc3 *dwc,
444 struct usb_ctrlrequest *ctrl, int set)
445{
446 enum usb_device_state state;
447 u32 wValue;
448 u32 wIndex;
449 int ret = 0;
450
451 wValue = le16_to_cpu(ctrl->wValue);
452 wIndex = le16_to_cpu(ctrl->wIndex);
453 state = dwc->gadget.state;
454
455 switch (wValue) {
456 case USB_DEVICE_REMOTE_WAKEUP:
457 break;
458 /*
459 * 9.4.1 says only only for SS, in AddressState only for
460 * default control pipe
461 */
462 case USB_DEVICE_U1_ENABLE:
463 ret = dwc3_ep0_handle_u1(dwc, state, set);
464 break;
465 case USB_DEVICE_U2_ENABLE:
466 ret = dwc3_ep0_handle_u2(dwc, state, set);
467 break;
468 case USB_DEVICE_LTM_ENABLE:
469 ret = -EINVAL;
470 break;
471 case USB_DEVICE_TEST_MODE:
472 ret = dwc3_ep0_handle_test(dwc, state, wIndex, set);
473 break;
474 default:
475 ret = -EINVAL;
476 }
477
478 return ret;
479}
480
481static int dwc3_ep0_handle_intf(struct dwc3 *dwc,
482 struct usb_ctrlrequest *ctrl, int set)
483{
484 u32 wValue;
485 int ret = 0;
486
487 wValue = le16_to_cpu(ctrl->wValue);
488
489 switch (wValue) {
490 case USB_INTRF_FUNC_SUSPEND:
491 /*
492 * REVISIT: Ideally we would enable some low power mode here,
493 * however it's unclear what we should be doing here.
494 *
495 * For now, we're not doing anything, just making sure we return
496 * 0 so USB Command Verifier tests pass without any errors.
497 */
498 break;
499 default:
500 ret = -EINVAL;
501 }
502
503 return ret;
504}
505
506static int dwc3_ep0_handle_endpoint(struct dwc3 *dwc,
507 struct usb_ctrlrequest *ctrl, int set)
508{
509 struct dwc3_ep *dep;
510 u32 wValue;
511 int ret;
512
513 wValue = le16_to_cpu(ctrl->wValue);
514
515 switch (wValue) {
516 case USB_ENDPOINT_HALT:
517 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
518 if (!dep)
519 return -EINVAL;
520
521 if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
522 break;
523
524 ret = __dwc3_gadget_ep_set_halt(dep, set, true);
525 if (ret)
526 return -EINVAL;
527 break;
528 default:
529 return -EINVAL;
530 }
531
532 return 0;
533}
534
535static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
536 struct usb_ctrlrequest *ctrl, int set)
537{
538 u32 recip;
539 int ret;
540
541 recip = ctrl->bRequestType & USB_RECIP_MASK;
542
543 switch (recip) {
544 case USB_RECIP_DEVICE:
545 ret = dwc3_ep0_handle_device(dwc, ctrl, set);
546 break;
547 case USB_RECIP_INTERFACE:
548 ret = dwc3_ep0_handle_intf(dwc, ctrl, set);
549 break;
550 case USB_RECIP_ENDPOINT:
551 ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set);
552 break;
553 default:
554 ret = -EINVAL;
555 }
556
557 return ret;
558}
559
560static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
561{
562 enum usb_device_state state = dwc->gadget.state;
563 u32 addr;
564 u32 reg;
565
566 addr = le16_to_cpu(ctrl->wValue);
567 if (addr > 127) {
568 dev_err(dwc->dev, "invalid device address %d\n", addr);
569 return -EINVAL;
570 }
571
572 if (state == USB_STATE_CONFIGURED) {
573 dev_err(dwc->dev, "can't SetAddress() from Configured State\n");
574 return -EINVAL;
575 }
576
577 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
578 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
579 reg |= DWC3_DCFG_DEVADDR(addr);
580 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
581
582 if (addr)
583 usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS);
584 else
585 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
586
587 return 0;
588}
589
590static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
591{
592 int ret;
593
594 spin_unlock(&dwc->lock);
595 ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl);
596 spin_lock(&dwc->lock);
597 return ret;
598}
599
600static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
601{
602 enum usb_device_state state = dwc->gadget.state;
603 u32 cfg;
604 int ret;
605 u32 reg;
606
607 cfg = le16_to_cpu(ctrl->wValue);
608
609 switch (state) {
610 case USB_STATE_DEFAULT:
611 return -EINVAL;
612
613 case USB_STATE_ADDRESS:
614 ret = dwc3_ep0_delegate_req(dwc, ctrl);
615 /* if the cfg matches and the cfg is non zero */
616 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
617
618 /*
619 * only change state if set_config has already
620 * been processed. If gadget driver returns
621 * USB_GADGET_DELAYED_STATUS, we will wait
622 * to change the state on the next usb_ep_queue()
623 */
624 if (ret == 0)
625 usb_gadget_set_state(&dwc->gadget,
626 USB_STATE_CONFIGURED);
627
628 /*
629 * Enable transition to U1/U2 state when
630 * nothing is pending from application.
631 */
632 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
633 if (!dwc->dis_u1_entry_quirk)
634 reg |= DWC3_DCTL_ACCEPTU1ENA;
635 if (!dwc->dis_u2_entry_quirk)
636 reg |= DWC3_DCTL_ACCEPTU2ENA;
637 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
638 }
639 break;
640
641 case USB_STATE_CONFIGURED:
642 ret = dwc3_ep0_delegate_req(dwc, ctrl);
643 if (!cfg && !ret)
644 usb_gadget_set_state(&dwc->gadget,
645 USB_STATE_ADDRESS);
646 break;
647 default:
648 ret = -EINVAL;
649 }
650 return ret;
651}
652
653static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
654{
655 struct dwc3_ep *dep = to_dwc3_ep(ep);
656 struct dwc3 *dwc = dep->dwc;
657
658 u32 param = 0;
659 u32 reg;
660
661 struct timing {
662 u8 u1sel;
663 u8 u1pel;
664 __le16 u2sel;
665 __le16 u2pel;
666 } __packed timing;
667
668 int ret;
669
670 memcpy(&timing, req->buf, sizeof(timing));
671
672 dwc->u1sel = timing.u1sel;
673 dwc->u1pel = timing.u1pel;
674 dwc->u2sel = le16_to_cpu(timing.u2sel);
675 dwc->u2pel = le16_to_cpu(timing.u2pel);
676
677 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
678 if (reg & DWC3_DCTL_INITU2ENA)
679 param = dwc->u2pel;
680 if (reg & DWC3_DCTL_INITU1ENA)
681 param = dwc->u1pel;
682
683 /*
684 * According to Synopsys Databook, if parameter is
685 * greater than 125, a value of zero should be
686 * programmed in the register.
687 */
688 if (param > 125)
689 param = 0;
690
691 /* now that we have the time, issue DGCMD Set Sel */
692 ret = dwc3_send_gadget_generic_command(dwc,
693 DWC3_DGCMD_SET_PERIODIC_PAR, param);
694 WARN_ON(ret < 0);
695}
696
697static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
698{
699 struct dwc3_ep *dep;
700 enum usb_device_state state = dwc->gadget.state;
701 u16 wLength;
702
703 if (state == USB_STATE_DEFAULT)
704 return -EINVAL;
705
706 wLength = le16_to_cpu(ctrl->wLength);
707
708 if (wLength != 6) {
709 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
710 wLength);
711 return -EINVAL;
712 }
713
714 /*
715 * To handle Set SEL we need to receive 6 bytes from Host. So let's
716 * queue a usb_request for 6 bytes.
717 *
718 * Remember, though, this controller can't handle non-wMaxPacketSize
719 * aligned transfers on the OUT direction, so we queue a request for
720 * wMaxPacketSize instead.
721 */
722 dep = dwc->eps[0];
723 dwc->ep0_usb_req.dep = dep;
724 dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
725 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
726 dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
727
728 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
729}
730
731static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
732{
733 u16 wLength;
734 u16 wValue;
735 u16 wIndex;
736
737 wValue = le16_to_cpu(ctrl->wValue);
738 wLength = le16_to_cpu(ctrl->wLength);
739 wIndex = le16_to_cpu(ctrl->wIndex);
740
741 if (wIndex || wLength)
742 return -EINVAL;
743
744 dwc->gadget.isoch_delay = wValue;
745
746 return 0;
747}
748
749static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
750{
751 int ret;
752
753 switch (ctrl->bRequest) {
754 case USB_REQ_GET_STATUS:
755 ret = dwc3_ep0_handle_status(dwc, ctrl);
756 break;
757 case USB_REQ_CLEAR_FEATURE:
758 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
759 break;
760 case USB_REQ_SET_FEATURE:
761 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
762 break;
763 case USB_REQ_SET_ADDRESS:
764 ret = dwc3_ep0_set_address(dwc, ctrl);
765 break;
766 case USB_REQ_SET_CONFIGURATION:
767 ret = dwc3_ep0_set_config(dwc, ctrl);
768 break;
769 case USB_REQ_SET_SEL:
770 ret = dwc3_ep0_set_sel(dwc, ctrl);
771 break;
772 case USB_REQ_SET_ISOCH_DELAY:
773 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
774 break;
775 default:
776 ret = dwc3_ep0_delegate_req(dwc, ctrl);
777 break;
778 }
779
780 return ret;
781}
782
783static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
784 const struct dwc3_event_depevt *event)
785{
786 struct usb_ctrlrequest *ctrl = (void *) dwc->ep0_trb;
787 int ret = -EINVAL;
788 u32 len;
789
790 if (!dwc->gadget_driver)
791 goto out;
792
793 trace_dwc3_ctrl_req(ctrl);
794
795 len = le16_to_cpu(ctrl->wLength);
796 if (!len) {
797 dwc->three_stage_setup = false;
798 dwc->ep0_expect_in = false;
799 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
800 } else {
801 dwc->three_stage_setup = true;
802 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
803 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
804 }
805
806 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
807 ret = dwc3_ep0_std_request(dwc, ctrl);
808 else
809 ret = dwc3_ep0_delegate_req(dwc, ctrl);
810
811 if (ret == USB_GADGET_DELAYED_STATUS)
812 dwc->delayed_status = true;
813
814out:
815 if (ret < 0)
816 dwc3_ep0_stall_and_restart(dwc);
817}
818
819static void dwc3_ep0_complete_data(struct dwc3 *dwc,
820 const struct dwc3_event_depevt *event)
821{
822 struct dwc3_request *r;
823 struct usb_request *ur;
824 struct dwc3_trb *trb;
825 struct dwc3_ep *ep0;
826 u32 transferred = 0;
827 u32 status;
828 u32 length;
829 u8 epnum;
830
831 epnum = event->endpoint_number;
832 ep0 = dwc->eps[0];
833
834 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
835 trb = dwc->ep0_trb;
836 trace_dwc3_complete_trb(ep0, trb);
837
838 r = next_request(&ep0->pending_list);
839 if (!r)
840 return;
841
842 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
843 if (status == DWC3_TRBSTS_SETUP_PENDING) {
844 dwc->setup_packet_pending = true;
845 if (r)
846 dwc3_gadget_giveback(ep0, r, -ECONNRESET);
847
848 return;
849 }
850
851 ur = &r->request;
852
853 length = trb->size & DWC3_TRB_SIZE_MASK;
854 transferred = ur->length - length;
855 ur->actual += transferred;
856
857 if ((IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) &&
858 ur->length && ur->zero) || dwc->ep0_bounced) {
859 trb++;
860 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
861 trace_dwc3_complete_trb(ep0, trb);
862
863 if (r->direction)
864 dwc->eps[1]->trb_enqueue = 0;
865 else
866 dwc->eps[0]->trb_enqueue = 0;
867
868 dwc->ep0_bounced = false;
869 }
870
871 if ((epnum & 1) && ur->actual < ur->length)
872 dwc3_ep0_stall_and_restart(dwc);
873 else
874 dwc3_gadget_giveback(ep0, r, 0);
875}
876
877static void dwc3_ep0_complete_status(struct dwc3 *dwc,
878 const struct dwc3_event_depevt *event)
879{
880 struct dwc3_request *r;
881 struct dwc3_ep *dep;
882 struct dwc3_trb *trb;
883 u32 status;
884
885 dep = dwc->eps[0];
886 trb = dwc->ep0_trb;
887
888 trace_dwc3_complete_trb(dep, trb);
889
890 if (!list_empty(&dep->pending_list)) {
891 r = next_request(&dep->pending_list);
892
893 dwc3_gadget_giveback(dep, r, 0);
894 }
895
896 if (dwc->test_mode) {
897 int ret;
898
899 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
900 if (ret < 0) {
901 dev_err(dwc->dev, "invalid test #%d\n",
902 dwc->test_mode_nr);
903 dwc3_ep0_stall_and_restart(dwc);
904 return;
905 }
906 }
907
908 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
909 if (status == DWC3_TRBSTS_SETUP_PENDING)
910 dwc->setup_packet_pending = true;
911
912 dwc->ep0state = EP0_SETUP_PHASE;
913 dwc3_ep0_out_start(dwc);
914}
915
916static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
917 const struct dwc3_event_depevt *event)
918{
919 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
920
921 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
922 dep->resource_index = 0;
923 dwc->setup_packet_pending = false;
924
925 switch (dwc->ep0state) {
926 case EP0_SETUP_PHASE:
927 dwc3_ep0_inspect_setup(dwc, event);
928 break;
929
930 case EP0_DATA_PHASE:
931 dwc3_ep0_complete_data(dwc, event);
932 break;
933
934 case EP0_STATUS_PHASE:
935 dwc3_ep0_complete_status(dwc, event);
936 break;
937 default:
938 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
939 }
940}
941
942static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
943 struct dwc3_ep *dep, struct dwc3_request *req)
944{
945 int ret;
946
947 req->direction = !!dep->number;
948
949 if (req->request.length == 0) {
950 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 0,
951 DWC3_TRBCTL_CONTROL_DATA, false);
952 ret = dwc3_ep0_start_trans(dep);
953 } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
954 && (dep->number == 0)) {
955 u32 maxpacket;
956 u32 rem;
957
958 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
959 &req->request, dep->number);
960 if (ret)
961 return;
962
963 maxpacket = dep->endpoint.maxpacket;
964 rem = req->request.length % maxpacket;
965 dwc->ep0_bounced = true;
966
967 /* prepare normal TRB */
968 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
969 req->request.length,
970 DWC3_TRBCTL_CONTROL_DATA,
971 true);
972
973 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1];
974
975 /* Now prepare one extra TRB to align transfer size */
976 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr,
977 maxpacket - rem,
978 DWC3_TRBCTL_CONTROL_DATA,
979 false);
980 ret = dwc3_ep0_start_trans(dep);
981 } else if (IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) &&
982 req->request.length && req->request.zero) {
983
984 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
985 &req->request, dep->number);
986 if (ret)
987 return;
988
989 /* prepare normal TRB */
990 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
991 req->request.length,
992 DWC3_TRBCTL_CONTROL_DATA,
993 true);
994
995 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1];
996
997 /* Now prepare one extra TRB to align transfer size */
998 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr,
999 0, DWC3_TRBCTL_CONTROL_DATA,
1000 false);
1001 ret = dwc3_ep0_start_trans(dep);
1002 } else {
1003 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1004 &req->request, dep->number);
1005 if (ret)
1006 return;
1007
1008 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
1009 req->request.length, DWC3_TRBCTL_CONTROL_DATA,
1010 false);
1011
1012 req->trb = &dwc->ep0_trb[dep->trb_enqueue];
1013
1014 ret = dwc3_ep0_start_trans(dep);
1015 }
1016
1017 WARN_ON(ret < 0);
1018}
1019
1020static int dwc3_ep0_start_control_status(struct dwc3_ep *dep)
1021{
1022 struct dwc3 *dwc = dep->dwc;
1023 u32 type;
1024
1025 type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3
1026 : DWC3_TRBCTL_CONTROL_STATUS2;
1027
1028 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 0, type, false);
1029 return dwc3_ep0_start_trans(dep);
1030}
1031
1032static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
1033{
1034 WARN_ON(dwc3_ep0_start_control_status(dep));
1035}
1036
1037static void dwc3_ep0_do_control_status(struct dwc3 *dwc,
1038 const struct dwc3_event_depevt *event)
1039{
1040 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
1041
1042 __dwc3_ep0_do_control_status(dwc, dep);
1043}
1044
1045static void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep)
1046{
1047 struct dwc3_gadget_ep_cmd_params params;
1048 u32 cmd;
1049 int ret;
1050
1051 if (!dep->resource_index)
1052 return;
1053
1054 cmd = DWC3_DEPCMD_ENDTRANSFER;
1055 cmd |= DWC3_DEPCMD_CMDIOC;
1056 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1057 memset(¶ms, 0, sizeof(params));
1058 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1059 WARN_ON_ONCE(ret);
1060 dep->resource_index = 0;
1061}
1062
1063static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
1064 const struct dwc3_event_depevt *event)
1065{
1066 switch (event->status) {
1067 case DEPEVT_STATUS_CONTROL_DATA:
1068 /*
1069 * We already have a DATA transfer in the controller's cache,
1070 * if we receive a XferNotReady(DATA) we will ignore it, unless
1071 * it's for the wrong direction.
1072 *
1073 * In that case, we must issue END_TRANSFER command to the Data
1074 * Phase we already have started and issue SetStall on the
1075 * control endpoint.
1076 */
1077 if (dwc->ep0_expect_in != event->endpoint_number) {
1078 struct dwc3_ep *dep = dwc->eps[dwc->ep0_expect_in];
1079
1080 dev_err(dwc->dev, "unexpected direction for Data Phase\n");
1081 dwc3_ep0_end_control_data(dwc, dep);
1082 dwc3_ep0_stall_and_restart(dwc);
1083 return;
1084 }
1085
1086 break;
1087
1088 case DEPEVT_STATUS_CONTROL_STATUS:
1089 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
1090 return;
1091
1092 dwc->ep0state = EP0_STATUS_PHASE;
1093
1094 if (dwc->delayed_status) {
1095 struct dwc3_ep *dep = dwc->eps[0];
1096
1097 WARN_ON_ONCE(event->endpoint_number != 1);
1098 /*
1099 * We should handle the delay STATUS phase here if the
1100 * request for handling delay STATUS has been queued
1101 * into the list.
1102 */
1103 if (!list_empty(&dep->pending_list)) {
1104 dwc->delayed_status = false;
1105 usb_gadget_set_state(&dwc->gadget,
1106 USB_STATE_CONFIGURED);
1107 dwc3_ep0_do_control_status(dwc, event);
1108 }
1109
1110 return;
1111 }
1112
1113 dwc3_ep0_do_control_status(dwc, event);
1114 }
1115}
1116
1117void dwc3_ep0_interrupt(struct dwc3 *dwc,
1118 const struct dwc3_event_depevt *event)
1119{
1120 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
1121 u8 cmd;
1122
1123 switch (event->endpoint_event) {
1124 case DWC3_DEPEVT_XFERCOMPLETE:
1125 dwc3_ep0_xfer_complete(dwc, event);
1126 break;
1127
1128 case DWC3_DEPEVT_XFERNOTREADY:
1129 dwc3_ep0_xfernotready(dwc, event);
1130 break;
1131
1132 case DWC3_DEPEVT_XFERINPROGRESS:
1133 case DWC3_DEPEVT_RXTXFIFOEVT:
1134 case DWC3_DEPEVT_STREAMEVT:
1135 break;
1136 case DWC3_DEPEVT_EPCMDCMPLT:
1137 cmd = DEPEVT_PARAMETER_CMD(event->parameters);
1138
1139 if (cmd == DWC3_DEPCMD_ENDTRANSFER) {
1140 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
1141 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
1142 }
1143 break;
1144 }
1145}