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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/**
2 * ep0.c - DesignWare USB3 DRD Controller Endpoint 0 Handling
3 *
4 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
5 *
6 * Authors: Felipe Balbi <balbi@ti.com>,
7 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
8 *
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 of
11 * the License as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19#include <linux/kernel.h>
20#include <linux/slab.h>
21#include <linux/spinlock.h>
22#include <linux/platform_device.h>
23#include <linux/pm_runtime.h>
24#include <linux/interrupt.h>
25#include <linux/io.h>
26#include <linux/list.h>
27#include <linux/dma-mapping.h>
28
29#include <linux/usb/ch9.h>
30#include <linux/usb/gadget.h>
31#include <linux/usb/composite.h>
32
33#include "core.h"
34#include "gadget.h"
35#include "io.h"
36
37static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
38static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
39 struct dwc3_ep *dep, struct dwc3_request *req);
40
41static const char *dwc3_ep0_state_string(enum dwc3_ep0_state state)
42{
43 switch (state) {
44 case EP0_UNCONNECTED:
45 return "Unconnected";
46 case EP0_SETUP_PHASE:
47 return "Setup Phase";
48 case EP0_DATA_PHASE:
49 return "Data Phase";
50 case EP0_STATUS_PHASE:
51 return "Status Phase";
52 default:
53 return "UNKNOWN";
54 }
55}
56
57static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma,
58 u32 len, u32 type)
59{
60 struct dwc3_gadget_ep_cmd_params params;
61 struct dwc3_trb *trb;
62 struct dwc3_ep *dep;
63
64 int ret;
65
66 dep = dwc->eps[epnum];
67 if (dep->flags & DWC3_EP_BUSY) {
68 dev_vdbg(dwc->dev, "%s: still busy\n", dep->name);
69 return 0;
70 }
71
72 trb = dwc->ep0_trb;
73
74 trb->bpl = lower_32_bits(buf_dma);
75 trb->bph = upper_32_bits(buf_dma);
76 trb->size = len;
77 trb->ctrl = type;
78
79 trb->ctrl |= (DWC3_TRB_CTRL_HWO
80 | DWC3_TRB_CTRL_LST
81 | DWC3_TRB_CTRL_IOC
82 | DWC3_TRB_CTRL_ISP_IMI);
83
84 memset(¶ms, 0, sizeof(params));
85 params.param0 = upper_32_bits(dwc->ep0_trb_addr);
86 params.param1 = lower_32_bits(dwc->ep0_trb_addr);
87
88 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
89 DWC3_DEPCMD_STARTTRANSFER, ¶ms);
90 if (ret < 0) {
91 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
92 return ret;
93 }
94
95 dep->flags |= DWC3_EP_BUSY;
96 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
97 dep->number);
98
99 dwc->ep0_next_event = DWC3_EP0_COMPLETE;
100
101 return 0;
102}
103
104static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep,
105 struct dwc3_request *req)
106{
107 struct dwc3 *dwc = dep->dwc;
108
109 req->request.actual = 0;
110 req->request.status = -EINPROGRESS;
111 req->epnum = dep->number;
112
113 list_add_tail(&req->list, &dep->request_list);
114
115 /*
116 * Gadget driver might not be quick enough to queue a request
117 * before we get a Transfer Not Ready event on this endpoint.
118 *
119 * In that case, we will set DWC3_EP_PENDING_REQUEST. When that
120 * flag is set, it's telling us that as soon as Gadget queues the
121 * required request, we should kick the transfer here because the
122 * IRQ we were waiting for is long gone.
123 */
124 if (dep->flags & DWC3_EP_PENDING_REQUEST) {
125 unsigned direction;
126
127 direction = !!(dep->flags & DWC3_EP0_DIR_IN);
128
129 if (dwc->ep0state != EP0_DATA_PHASE) {
130 dev_WARN(dwc->dev, "Unexpected pending request\n");
131 return 0;
132 }
133
134 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
135
136 dep->flags &= ~(DWC3_EP_PENDING_REQUEST |
137 DWC3_EP0_DIR_IN);
138
139 return 0;
140 }
141
142 /*
143 * In case gadget driver asked us to delay the STATUS phase,
144 * handle it here.
145 */
146 if (dwc->delayed_status) {
147 unsigned direction;
148
149 direction = !dwc->ep0_expect_in;
150 dwc->delayed_status = false;
151 usb_gadget_set_state(&dwc->gadget, USB_STATE_CONFIGURED);
152
153 if (dwc->ep0state == EP0_STATUS_PHASE)
154 __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
155 else
156 dev_dbg(dwc->dev, "too early for delayed status\n");
157
158 return 0;
159 }
160
161 /*
162 * Unfortunately we have uncovered a limitation wrt the Data Phase.
163 *
164 * Section 9.4 says we can wait for the XferNotReady(DATA) event to
165 * come before issueing Start Transfer command, but if we do, we will
166 * miss situations where the host starts another SETUP phase instead of
167 * the DATA phase. Such cases happen at least on TD.7.6 of the Link
168 * Layer Compliance Suite.
169 *
170 * The problem surfaces due to the fact that in case of back-to-back
171 * SETUP packets there will be no XferNotReady(DATA) generated and we
172 * will be stuck waiting for XferNotReady(DATA) forever.
173 *
174 * By looking at tables 9-13 and 9-14 of the Databook, we can see that
175 * it tells us to start Data Phase right away. It also mentions that if
176 * we receive a SETUP phase instead of the DATA phase, core will issue
177 * XferComplete for the DATA phase, before actually initiating it in
178 * the wire, with the TRB's status set to "SETUP_PENDING". Such status
179 * can only be used to print some debugging logs, as the core expects
180 * us to go through to the STATUS phase and start a CONTROL_STATUS TRB,
181 * just so it completes right away, without transferring anything and,
182 * only then, we can go back to the SETUP phase.
183 *
184 * Because of this scenario, SNPS decided to change the programming
185 * model of control transfers and support on-demand transfers only for
186 * the STATUS phase. To fix the issue we have now, we will always wait
187 * for gadget driver to queue the DATA phase's struct usb_request, then
188 * start it right away.
189 *
190 * If we're actually in a 2-stage transfer, we will wait for
191 * XferNotReady(STATUS).
192 */
193 if (dwc->three_stage_setup) {
194 unsigned direction;
195
196 direction = dwc->ep0_expect_in;
197 dwc->ep0state = EP0_DATA_PHASE;
198
199 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
200
201 dep->flags &= ~DWC3_EP0_DIR_IN;
202 }
203
204 return 0;
205}
206
207int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
208 gfp_t gfp_flags)
209{
210 struct dwc3_request *req = to_dwc3_request(request);
211 struct dwc3_ep *dep = to_dwc3_ep(ep);
212 struct dwc3 *dwc = dep->dwc;
213
214 unsigned long flags;
215
216 int ret;
217
218 spin_lock_irqsave(&dwc->lock, flags);
219 if (!dep->endpoint.desc) {
220 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
221 request, dep->name);
222 ret = -ESHUTDOWN;
223 goto out;
224 }
225
226 /* we share one TRB for ep0/1 */
227 if (!list_empty(&dep->request_list)) {
228 ret = -EBUSY;
229 goto out;
230 }
231
232 dev_vdbg(dwc->dev, "queueing request %p to %s length %d, state '%s'\n",
233 request, dep->name, request->length,
234 dwc3_ep0_state_string(dwc->ep0state));
235
236 ret = __dwc3_gadget_ep0_queue(dep, req);
237
238out:
239 spin_unlock_irqrestore(&dwc->lock, flags);
240
241 return ret;
242}
243
244static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
245{
246 struct dwc3_ep *dep;
247
248 /* reinitialize physical ep1 */
249 dep = dwc->eps[1];
250 dep->flags = DWC3_EP_ENABLED;
251
252 /* stall is always issued on EP0 */
253 dep = dwc->eps[0];
254 __dwc3_gadget_ep_set_halt(dep, 1);
255 dep->flags = DWC3_EP_ENABLED;
256 dwc->delayed_status = false;
257
258 if (!list_empty(&dep->request_list)) {
259 struct dwc3_request *req;
260
261 req = next_request(&dep->request_list);
262 dwc3_gadget_giveback(dep, req, -ECONNRESET);
263 }
264
265 dwc->ep0state = EP0_SETUP_PHASE;
266 dwc3_ep0_out_start(dwc);
267}
268
269int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
270{
271 struct dwc3_ep *dep = to_dwc3_ep(ep);
272 struct dwc3 *dwc = dep->dwc;
273
274 dwc3_ep0_stall_and_restart(dwc);
275
276 return 0;
277}
278
279void dwc3_ep0_out_start(struct dwc3 *dwc)
280{
281 int ret;
282
283 ret = dwc3_ep0_start_trans(dwc, 0, dwc->ctrl_req_addr, 8,
284 DWC3_TRBCTL_CONTROL_SETUP);
285 WARN_ON(ret < 0);
286}
287
288static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
289{
290 struct dwc3_ep *dep;
291 u32 windex = le16_to_cpu(wIndex_le);
292 u32 epnum;
293
294 epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1;
295 if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
296 epnum |= 1;
297
298 dep = dwc->eps[epnum];
299 if (dep->flags & DWC3_EP_ENABLED)
300 return dep;
301
302 return NULL;
303}
304
305static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
306{
307}
308/*
309 * ch 9.4.5
310 */
311static int dwc3_ep0_handle_status(struct dwc3 *dwc,
312 struct usb_ctrlrequest *ctrl)
313{
314 struct dwc3_ep *dep;
315 u32 recip;
316 u32 reg;
317 u16 usb_status = 0;
318 __le16 *response_pkt;
319
320 recip = ctrl->bRequestType & USB_RECIP_MASK;
321 switch (recip) {
322 case USB_RECIP_DEVICE:
323 /*
324 * LTM will be set once we know how to set this in HW.
325 */
326 usb_status |= dwc->is_selfpowered << USB_DEVICE_SELF_POWERED;
327
328 if (dwc->speed == DWC3_DSTS_SUPERSPEED) {
329 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
330 if (reg & DWC3_DCTL_INITU1ENA)
331 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
332 if (reg & DWC3_DCTL_INITU2ENA)
333 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
334 }
335
336 break;
337
338 case USB_RECIP_INTERFACE:
339 /*
340 * Function Remote Wake Capable D0
341 * Function Remote Wakeup D1
342 */
343 break;
344
345 case USB_RECIP_ENDPOINT:
346 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
347 if (!dep)
348 return -EINVAL;
349
350 if (dep->flags & DWC3_EP_STALL)
351 usb_status = 1 << USB_ENDPOINT_HALT;
352 break;
353 default:
354 return -EINVAL;
355 }
356
357 response_pkt = (__le16 *) dwc->setup_buf;
358 *response_pkt = cpu_to_le16(usb_status);
359
360 dep = dwc->eps[0];
361 dwc->ep0_usb_req.dep = dep;
362 dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
363 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
364 dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
365
366 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
367}
368
369static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
370 struct usb_ctrlrequest *ctrl, int set)
371{
372 struct dwc3_ep *dep;
373 u32 recip;
374 u32 wValue;
375 u32 wIndex;
376 u32 reg;
377 int ret;
378 enum usb_device_state state;
379
380 wValue = le16_to_cpu(ctrl->wValue);
381 wIndex = le16_to_cpu(ctrl->wIndex);
382 recip = ctrl->bRequestType & USB_RECIP_MASK;
383 state = dwc->gadget.state;
384
385 switch (recip) {
386 case USB_RECIP_DEVICE:
387
388 switch (wValue) {
389 case USB_DEVICE_REMOTE_WAKEUP:
390 break;
391 /*
392 * 9.4.1 says only only for SS, in AddressState only for
393 * default control pipe
394 */
395 case USB_DEVICE_U1_ENABLE:
396 if (state != USB_STATE_CONFIGURED)
397 return -EINVAL;
398 if (dwc->speed != DWC3_DSTS_SUPERSPEED)
399 return -EINVAL;
400
401 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
402 if (set)
403 reg |= DWC3_DCTL_INITU1ENA;
404 else
405 reg &= ~DWC3_DCTL_INITU1ENA;
406 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
407 break;
408
409 case USB_DEVICE_U2_ENABLE:
410 if (state != USB_STATE_CONFIGURED)
411 return -EINVAL;
412 if (dwc->speed != DWC3_DSTS_SUPERSPEED)
413 return -EINVAL;
414
415 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
416 if (set)
417 reg |= DWC3_DCTL_INITU2ENA;
418 else
419 reg &= ~DWC3_DCTL_INITU2ENA;
420 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
421 break;
422
423 case USB_DEVICE_LTM_ENABLE:
424 return -EINVAL;
425 break;
426
427 case USB_DEVICE_TEST_MODE:
428 if ((wIndex & 0xff) != 0)
429 return -EINVAL;
430 if (!set)
431 return -EINVAL;
432
433 dwc->test_mode_nr = wIndex >> 8;
434 dwc->test_mode = true;
435 break;
436 default:
437 return -EINVAL;
438 }
439 break;
440
441 case USB_RECIP_INTERFACE:
442 switch (wValue) {
443 case USB_INTRF_FUNC_SUSPEND:
444 if (wIndex & USB_INTRF_FUNC_SUSPEND_LP)
445 /* XXX enable Low power suspend */
446 ;
447 if (wIndex & USB_INTRF_FUNC_SUSPEND_RW)
448 /* XXX enable remote wakeup */
449 ;
450 break;
451 default:
452 return -EINVAL;
453 }
454 break;
455
456 case USB_RECIP_ENDPOINT:
457 switch (wValue) {
458 case USB_ENDPOINT_HALT:
459 dep = dwc3_wIndex_to_dep(dwc, wIndex);
460 if (!dep)
461 return -EINVAL;
462 if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
463 break;
464 ret = __dwc3_gadget_ep_set_halt(dep, set);
465 if (ret)
466 return -EINVAL;
467 break;
468 default:
469 return -EINVAL;
470 }
471 break;
472
473 default:
474 return -EINVAL;
475 }
476
477 return 0;
478}
479
480static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
481{
482 enum usb_device_state state = dwc->gadget.state;
483 u32 addr;
484 u32 reg;
485
486 addr = le16_to_cpu(ctrl->wValue);
487 if (addr > 127) {
488 dev_dbg(dwc->dev, "invalid device address %d\n", addr);
489 return -EINVAL;
490 }
491
492 if (state == USB_STATE_CONFIGURED) {
493 dev_dbg(dwc->dev, "trying to set address when configured\n");
494 return -EINVAL;
495 }
496
497 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
498 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
499 reg |= DWC3_DCFG_DEVADDR(addr);
500 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
501
502 if (addr)
503 usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS);
504 else
505 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
506
507 return 0;
508}
509
510static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
511{
512 int ret;
513
514 spin_unlock(&dwc->lock);
515 ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl);
516 spin_lock(&dwc->lock);
517 return ret;
518}
519
520static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
521{
522 enum usb_device_state state = dwc->gadget.state;
523 u32 cfg;
524 int ret;
525 u32 reg;
526
527 dwc->start_config_issued = false;
528 cfg = le16_to_cpu(ctrl->wValue);
529
530 switch (state) {
531 case USB_STATE_DEFAULT:
532 return -EINVAL;
533 break;
534
535 case USB_STATE_ADDRESS:
536 ret = dwc3_ep0_delegate_req(dwc, ctrl);
537 /* if the cfg matches and the cfg is non zero */
538 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
539
540 /*
541 * only change state if set_config has already
542 * been processed. If gadget driver returns
543 * USB_GADGET_DELAYED_STATUS, we will wait
544 * to change the state on the next usb_ep_queue()
545 */
546 if (ret == 0)
547 usb_gadget_set_state(&dwc->gadget,
548 USB_STATE_CONFIGURED);
549
550 /*
551 * Enable transition to U1/U2 state when
552 * nothing is pending from application.
553 */
554 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
555 reg |= (DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA);
556 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
557
558 dwc->resize_fifos = true;
559 dev_dbg(dwc->dev, "resize fifos flag SET\n");
560 }
561 break;
562
563 case USB_STATE_CONFIGURED:
564 ret = dwc3_ep0_delegate_req(dwc, ctrl);
565 if (!cfg && !ret)
566 usb_gadget_set_state(&dwc->gadget,
567 USB_STATE_ADDRESS);
568 break;
569 default:
570 ret = -EINVAL;
571 }
572 return ret;
573}
574
575static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
576{
577 struct dwc3_ep *dep = to_dwc3_ep(ep);
578 struct dwc3 *dwc = dep->dwc;
579
580 u32 param = 0;
581 u32 reg;
582
583 struct timing {
584 u8 u1sel;
585 u8 u1pel;
586 u16 u2sel;
587 u16 u2pel;
588 } __packed timing;
589
590 int ret;
591
592 memcpy(&timing, req->buf, sizeof(timing));
593
594 dwc->u1sel = timing.u1sel;
595 dwc->u1pel = timing.u1pel;
596 dwc->u2sel = le16_to_cpu(timing.u2sel);
597 dwc->u2pel = le16_to_cpu(timing.u2pel);
598
599 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
600 if (reg & DWC3_DCTL_INITU2ENA)
601 param = dwc->u2pel;
602 if (reg & DWC3_DCTL_INITU1ENA)
603 param = dwc->u1pel;
604
605 /*
606 * According to Synopsys Databook, if parameter is
607 * greater than 125, a value of zero should be
608 * programmed in the register.
609 */
610 if (param > 125)
611 param = 0;
612
613 /* now that we have the time, issue DGCMD Set Sel */
614 ret = dwc3_send_gadget_generic_command(dwc,
615 DWC3_DGCMD_SET_PERIODIC_PAR, param);
616 WARN_ON(ret < 0);
617}
618
619static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
620{
621 struct dwc3_ep *dep;
622 enum usb_device_state state = dwc->gadget.state;
623 u16 wLength;
624 u16 wValue;
625
626 if (state == USB_STATE_DEFAULT)
627 return -EINVAL;
628
629 wValue = le16_to_cpu(ctrl->wValue);
630 wLength = le16_to_cpu(ctrl->wLength);
631
632 if (wLength != 6) {
633 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
634 wLength);
635 return -EINVAL;
636 }
637
638 /*
639 * To handle Set SEL we need to receive 6 bytes from Host. So let's
640 * queue a usb_request for 6 bytes.
641 *
642 * Remember, though, this controller can't handle non-wMaxPacketSize
643 * aligned transfers on the OUT direction, so we queue a request for
644 * wMaxPacketSize instead.
645 */
646 dep = dwc->eps[0];
647 dwc->ep0_usb_req.dep = dep;
648 dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
649 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
650 dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
651
652 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
653}
654
655static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
656{
657 u16 wLength;
658 u16 wValue;
659 u16 wIndex;
660
661 wValue = le16_to_cpu(ctrl->wValue);
662 wLength = le16_to_cpu(ctrl->wLength);
663 wIndex = le16_to_cpu(ctrl->wIndex);
664
665 if (wIndex || wLength)
666 return -EINVAL;
667
668 /*
669 * REVISIT It's unclear from Databook what to do with this
670 * value. For now, just cache it.
671 */
672 dwc->isoch_delay = wValue;
673
674 return 0;
675}
676
677static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
678{
679 int ret;
680
681 switch (ctrl->bRequest) {
682 case USB_REQ_GET_STATUS:
683 dev_vdbg(dwc->dev, "USB_REQ_GET_STATUS\n");
684 ret = dwc3_ep0_handle_status(dwc, ctrl);
685 break;
686 case USB_REQ_CLEAR_FEATURE:
687 dev_vdbg(dwc->dev, "USB_REQ_CLEAR_FEATURE\n");
688 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
689 break;
690 case USB_REQ_SET_FEATURE:
691 dev_vdbg(dwc->dev, "USB_REQ_SET_FEATURE\n");
692 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
693 break;
694 case USB_REQ_SET_ADDRESS:
695 dev_vdbg(dwc->dev, "USB_REQ_SET_ADDRESS\n");
696 ret = dwc3_ep0_set_address(dwc, ctrl);
697 break;
698 case USB_REQ_SET_CONFIGURATION:
699 dev_vdbg(dwc->dev, "USB_REQ_SET_CONFIGURATION\n");
700 ret = dwc3_ep0_set_config(dwc, ctrl);
701 break;
702 case USB_REQ_SET_SEL:
703 dev_vdbg(dwc->dev, "USB_REQ_SET_SEL\n");
704 ret = dwc3_ep0_set_sel(dwc, ctrl);
705 break;
706 case USB_REQ_SET_ISOCH_DELAY:
707 dev_vdbg(dwc->dev, "USB_REQ_SET_ISOCH_DELAY\n");
708 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
709 break;
710 default:
711 dev_vdbg(dwc->dev, "Forwarding to gadget driver\n");
712 ret = dwc3_ep0_delegate_req(dwc, ctrl);
713 break;
714 }
715
716 return ret;
717}
718
719static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
720 const struct dwc3_event_depevt *event)
721{
722 struct usb_ctrlrequest *ctrl = dwc->ctrl_req;
723 int ret = -EINVAL;
724 u32 len;
725
726 if (!dwc->gadget_driver)
727 goto out;
728
729 len = le16_to_cpu(ctrl->wLength);
730 if (!len) {
731 dwc->three_stage_setup = false;
732 dwc->ep0_expect_in = false;
733 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
734 } else {
735 dwc->three_stage_setup = true;
736 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
737 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
738 }
739
740 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
741 ret = dwc3_ep0_std_request(dwc, ctrl);
742 else
743 ret = dwc3_ep0_delegate_req(dwc, ctrl);
744
745 if (ret == USB_GADGET_DELAYED_STATUS)
746 dwc->delayed_status = true;
747
748out:
749 if (ret < 0)
750 dwc3_ep0_stall_and_restart(dwc);
751}
752
753static void dwc3_ep0_complete_data(struct dwc3 *dwc,
754 const struct dwc3_event_depevt *event)
755{
756 struct dwc3_request *r = NULL;
757 struct usb_request *ur;
758 struct dwc3_trb *trb;
759 struct dwc3_ep *ep0;
760 u32 transferred;
761 u32 status;
762 u32 length;
763 u8 epnum;
764
765 epnum = event->endpoint_number;
766 ep0 = dwc->eps[0];
767
768 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
769
770 r = next_request(&ep0->request_list);
771 ur = &r->request;
772
773 trb = dwc->ep0_trb;
774
775 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
776 if (status == DWC3_TRBSTS_SETUP_PENDING) {
777 dev_dbg(dwc->dev, "Setup Pending received\n");
778
779 if (r)
780 dwc3_gadget_giveback(ep0, r, -ECONNRESET);
781
782 return;
783 }
784
785 length = trb->size & DWC3_TRB_SIZE_MASK;
786
787 if (dwc->ep0_bounced) {
788 unsigned transfer_size = ur->length;
789 unsigned maxp = ep0->endpoint.maxpacket;
790
791 transfer_size += (maxp - (transfer_size % maxp));
792 transferred = min_t(u32, ur->length,
793 transfer_size - length);
794 memcpy(ur->buf, dwc->ep0_bounce, transferred);
795 } else {
796 transferred = ur->length - length;
797 }
798
799 ur->actual += transferred;
800
801 if ((epnum & 1) && ur->actual < ur->length) {
802 /* for some reason we did not get everything out */
803
804 dwc3_ep0_stall_and_restart(dwc);
805 } else {
806 /*
807 * handle the case where we have to send a zero packet. This
808 * seems to be case when req.length > maxpacket. Could it be?
809 */
810 if (r)
811 dwc3_gadget_giveback(ep0, r, 0);
812 }
813}
814
815static void dwc3_ep0_complete_status(struct dwc3 *dwc,
816 const struct dwc3_event_depevt *event)
817{
818 struct dwc3_request *r;
819 struct dwc3_ep *dep;
820 struct dwc3_trb *trb;
821 u32 status;
822
823 dep = dwc->eps[0];
824 trb = dwc->ep0_trb;
825
826 if (!list_empty(&dep->request_list)) {
827 r = next_request(&dep->request_list);
828
829 dwc3_gadget_giveback(dep, r, 0);
830 }
831
832 if (dwc->test_mode) {
833 int ret;
834
835 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
836 if (ret < 0) {
837 dev_dbg(dwc->dev, "Invalid Test #%d\n",
838 dwc->test_mode_nr);
839 dwc3_ep0_stall_and_restart(dwc);
840 return;
841 }
842 }
843
844 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
845 if (status == DWC3_TRBSTS_SETUP_PENDING)
846 dev_dbg(dwc->dev, "Setup Pending received\n");
847
848 dwc->ep0state = EP0_SETUP_PHASE;
849 dwc3_ep0_out_start(dwc);
850}
851
852static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
853 const struct dwc3_event_depevt *event)
854{
855 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
856
857 dep->flags &= ~DWC3_EP_BUSY;
858 dep->resource_index = 0;
859 dwc->setup_packet_pending = false;
860
861 switch (dwc->ep0state) {
862 case EP0_SETUP_PHASE:
863 dev_vdbg(dwc->dev, "Inspecting Setup Bytes\n");
864 dwc3_ep0_inspect_setup(dwc, event);
865 break;
866
867 case EP0_DATA_PHASE:
868 dev_vdbg(dwc->dev, "Data Phase\n");
869 dwc3_ep0_complete_data(dwc, event);
870 break;
871
872 case EP0_STATUS_PHASE:
873 dev_vdbg(dwc->dev, "Status Phase\n");
874 dwc3_ep0_complete_status(dwc, event);
875 break;
876 default:
877 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
878 }
879}
880
881static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
882 struct dwc3_ep *dep, struct dwc3_request *req)
883{
884 int ret;
885
886 req->direction = !!dep->number;
887
888 if (req->request.length == 0) {
889 ret = dwc3_ep0_start_trans(dwc, dep->number,
890 dwc->ctrl_req_addr, 0,
891 DWC3_TRBCTL_CONTROL_DATA);
892 } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
893 && (dep->number == 0)) {
894 u32 transfer_size;
895 u32 maxpacket;
896
897 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
898 dep->number);
899 if (ret) {
900 dev_dbg(dwc->dev, "failed to map request\n");
901 return;
902 }
903
904 WARN_ON(req->request.length > DWC3_EP0_BOUNCE_SIZE);
905
906 maxpacket = dep->endpoint.maxpacket;
907 transfer_size = roundup(req->request.length, maxpacket);
908
909 dwc->ep0_bounced = true;
910
911 /*
912 * REVISIT in case request length is bigger than
913 * DWC3_EP0_BOUNCE_SIZE we will need two chained
914 * TRBs to handle the transfer.
915 */
916 ret = dwc3_ep0_start_trans(dwc, dep->number,
917 dwc->ep0_bounce_addr, transfer_size,
918 DWC3_TRBCTL_CONTROL_DATA);
919 } else {
920 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
921 dep->number);
922 if (ret) {
923 dev_dbg(dwc->dev, "failed to map request\n");
924 return;
925 }
926
927 ret = dwc3_ep0_start_trans(dwc, dep->number, req->request.dma,
928 req->request.length, DWC3_TRBCTL_CONTROL_DATA);
929 }
930
931 WARN_ON(ret < 0);
932}
933
934static int dwc3_ep0_start_control_status(struct dwc3_ep *dep)
935{
936 struct dwc3 *dwc = dep->dwc;
937 u32 type;
938
939 type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3
940 : DWC3_TRBCTL_CONTROL_STATUS2;
941
942 return dwc3_ep0_start_trans(dwc, dep->number,
943 dwc->ctrl_req_addr, 0, type);
944}
945
946static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
947{
948 if (dwc->resize_fifos) {
949 dev_dbg(dwc->dev, "starting to resize fifos\n");
950 dwc3_gadget_resize_tx_fifos(dwc);
951 dwc->resize_fifos = 0;
952 }
953
954 WARN_ON(dwc3_ep0_start_control_status(dep));
955}
956
957static void dwc3_ep0_do_control_status(struct dwc3 *dwc,
958 const struct dwc3_event_depevt *event)
959{
960 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
961
962 __dwc3_ep0_do_control_status(dwc, dep);
963}
964
965static void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep)
966{
967 struct dwc3_gadget_ep_cmd_params params;
968 u32 cmd;
969 int ret;
970
971 if (!dep->resource_index)
972 return;
973
974 cmd = DWC3_DEPCMD_ENDTRANSFER;
975 cmd |= DWC3_DEPCMD_CMDIOC;
976 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
977 memset(¶ms, 0, sizeof(params));
978 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms);
979 WARN_ON_ONCE(ret);
980 dep->resource_index = 0;
981}
982
983static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
984 const struct dwc3_event_depevt *event)
985{
986 dwc->setup_packet_pending = true;
987
988 switch (event->status) {
989 case DEPEVT_STATUS_CONTROL_DATA:
990 dev_vdbg(dwc->dev, "Control Data\n");
991
992 /*
993 * We already have a DATA transfer in the controller's cache,
994 * if we receive a XferNotReady(DATA) we will ignore it, unless
995 * it's for the wrong direction.
996 *
997 * In that case, we must issue END_TRANSFER command to the Data
998 * Phase we already have started and issue SetStall on the
999 * control endpoint.
1000 */
1001 if (dwc->ep0_expect_in != event->endpoint_number) {
1002 struct dwc3_ep *dep = dwc->eps[dwc->ep0_expect_in];
1003
1004 dev_vdbg(dwc->dev, "Wrong direction for Data phase\n");
1005 dwc3_ep0_end_control_data(dwc, dep);
1006 dwc3_ep0_stall_and_restart(dwc);
1007 return;
1008 }
1009
1010 break;
1011
1012 case DEPEVT_STATUS_CONTROL_STATUS:
1013 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
1014 return;
1015
1016 dev_vdbg(dwc->dev, "Control Status\n");
1017
1018 dwc->ep0state = EP0_STATUS_PHASE;
1019
1020 if (dwc->delayed_status) {
1021 WARN_ON_ONCE(event->endpoint_number != 1);
1022 dev_vdbg(dwc->dev, "Mass Storage delayed status\n");
1023 return;
1024 }
1025
1026 dwc3_ep0_do_control_status(dwc, event);
1027 }
1028}
1029
1030void dwc3_ep0_interrupt(struct dwc3 *dwc,
1031 const struct dwc3_event_depevt *event)
1032{
1033 u8 epnum = event->endpoint_number;
1034
1035 dev_dbg(dwc->dev, "%s while ep%d%s in state '%s'\n",
1036 dwc3_ep_event_string(event->endpoint_event),
1037 epnum >> 1, (epnum & 1) ? "in" : "out",
1038 dwc3_ep0_state_string(dwc->ep0state));
1039
1040 switch (event->endpoint_event) {
1041 case DWC3_DEPEVT_XFERCOMPLETE:
1042 dwc3_ep0_xfer_complete(dwc, event);
1043 break;
1044
1045 case DWC3_DEPEVT_XFERNOTREADY:
1046 dwc3_ep0_xfernotready(dwc, event);
1047 break;
1048
1049 case DWC3_DEPEVT_XFERINPROGRESS:
1050 case DWC3_DEPEVT_RXTXFIFOEVT:
1051 case DWC3_DEPEVT_STREAMEVT:
1052 case DWC3_DEPEVT_EPCMDCMPLT:
1053 break;
1054 }
1055}