Loading...
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 int 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 int 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 int 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 || !dwc->pullups_connected || !dwc->connected) {
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
221void 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->eps[0]->trb_enqueue = 0;
243 dwc->eps[1]->trb_enqueue = 0;
244 dwc->ep0state = EP0_SETUP_PHASE;
245 dwc3_ep0_out_start(dwc);
246}
247
248int __dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
249{
250 struct dwc3_ep *dep = to_dwc3_ep(ep);
251 struct dwc3 *dwc = dep->dwc;
252
253 dwc3_ep0_stall_and_restart(dwc);
254
255 return 0;
256}
257
258int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
259{
260 struct dwc3_ep *dep = to_dwc3_ep(ep);
261 struct dwc3 *dwc = dep->dwc;
262 unsigned long flags;
263 int ret;
264
265 spin_lock_irqsave(&dwc->lock, flags);
266 ret = __dwc3_gadget_ep0_set_halt(ep, value);
267 spin_unlock_irqrestore(&dwc->lock, flags);
268
269 return ret;
270}
271
272void dwc3_ep0_out_start(struct dwc3 *dwc)
273{
274 struct dwc3_ep *dep;
275 int ret;
276 int i;
277
278 complete(&dwc->ep0_in_setup);
279
280 dep = dwc->eps[0];
281 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 8,
282 DWC3_TRBCTL_CONTROL_SETUP, false);
283 ret = dwc3_ep0_start_trans(dep);
284 WARN_ON(ret < 0);
285 for (i = 2; i < DWC3_ENDPOINTS_NUM; i++) {
286 struct dwc3_ep *dwc3_ep;
287
288 dwc3_ep = dwc->eps[i];
289 if (!dwc3_ep)
290 continue;
291
292 if (!(dwc3_ep->flags & DWC3_EP_DELAY_STOP))
293 continue;
294
295 dwc3_ep->flags &= ~DWC3_EP_DELAY_STOP;
296 if (dwc->connected)
297 dwc3_stop_active_transfer(dwc3_ep, true, true);
298 else
299 dwc3_remove_requests(dwc, dwc3_ep, -ESHUTDOWN);
300 }
301}
302
303static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
304{
305 struct dwc3_ep *dep;
306 u32 windex = le16_to_cpu(wIndex_le);
307 u32 epnum;
308
309 epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1;
310 if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
311 epnum |= 1;
312
313 dep = dwc->eps[epnum];
314 if (dep == NULL)
315 return NULL;
316
317 if (dep->flags & DWC3_EP_ENABLED)
318 return dep;
319
320 return NULL;
321}
322
323static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
324{
325}
326/*
327 * ch 9.4.5
328 */
329static int dwc3_ep0_handle_status(struct dwc3 *dwc,
330 struct usb_ctrlrequest *ctrl)
331{
332 struct dwc3_ep *dep;
333 u32 recip;
334 u32 value;
335 u32 reg;
336 u16 usb_status = 0;
337 __le16 *response_pkt;
338
339 /* We don't support PTM_STATUS */
340 value = le16_to_cpu(ctrl->wValue);
341 if (value != 0)
342 return -EINVAL;
343
344 recip = ctrl->bRequestType & USB_RECIP_MASK;
345 switch (recip) {
346 case USB_RECIP_DEVICE:
347 /*
348 * LTM will be set once we know how to set this in HW.
349 */
350 usb_status |= dwc->gadget->is_selfpowered;
351
352 if ((dwc->speed == DWC3_DSTS_SUPERSPEED) ||
353 (dwc->speed == DWC3_DSTS_SUPERSPEED_PLUS)) {
354 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
355 if (reg & DWC3_DCTL_INITU1ENA)
356 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
357 if (reg & DWC3_DCTL_INITU2ENA)
358 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
359 }
360
361 break;
362
363 case USB_RECIP_INTERFACE:
364 /*
365 * Function Remote Wake Capable D0
366 * Function Remote Wakeup D1
367 */
368 break;
369
370 case USB_RECIP_ENDPOINT:
371 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
372 if (!dep)
373 return -EINVAL;
374
375 if (dep->flags & DWC3_EP_STALL)
376 usb_status = 1 << USB_ENDPOINT_HALT;
377 break;
378 default:
379 return -EINVAL;
380 }
381
382 response_pkt = (__le16 *) dwc->setup_buf;
383 *response_pkt = cpu_to_le16(usb_status);
384
385 dep = dwc->eps[0];
386 dwc->ep0_usb_req.dep = dep;
387 dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
388 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
389 dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
390
391 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
392}
393
394static int dwc3_ep0_handle_u1(struct dwc3 *dwc, enum usb_device_state state,
395 int set)
396{
397 u32 reg;
398
399 if (state != USB_STATE_CONFIGURED)
400 return -EINVAL;
401 if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
402 (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
403 return -EINVAL;
404 if (set && dwc->dis_u1_entry_quirk)
405 return -EINVAL;
406
407 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
408 if (set)
409 reg |= DWC3_DCTL_INITU1ENA;
410 else
411 reg &= ~DWC3_DCTL_INITU1ENA;
412 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
413
414 return 0;
415}
416
417static int dwc3_ep0_handle_u2(struct dwc3 *dwc, enum usb_device_state state,
418 int set)
419{
420 u32 reg;
421
422
423 if (state != USB_STATE_CONFIGURED)
424 return -EINVAL;
425 if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
426 (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
427 return -EINVAL;
428 if (set && dwc->dis_u2_entry_quirk)
429 return -EINVAL;
430
431 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
432 if (set)
433 reg |= DWC3_DCTL_INITU2ENA;
434 else
435 reg &= ~DWC3_DCTL_INITU2ENA;
436 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
437
438 return 0;
439}
440
441static int dwc3_ep0_handle_test(struct dwc3 *dwc, enum usb_device_state state,
442 u32 wIndex, int set)
443{
444 if ((wIndex & 0xff) != 0)
445 return -EINVAL;
446 if (!set)
447 return -EINVAL;
448
449 switch (wIndex >> 8) {
450 case USB_TEST_J:
451 case USB_TEST_K:
452 case USB_TEST_SE0_NAK:
453 case USB_TEST_PACKET:
454 case USB_TEST_FORCE_ENABLE:
455 dwc->test_mode_nr = wIndex >> 8;
456 dwc->test_mode = true;
457 break;
458 default:
459 return -EINVAL;
460 }
461
462 return 0;
463}
464
465static int dwc3_ep0_handle_device(struct dwc3 *dwc,
466 struct usb_ctrlrequest *ctrl, int set)
467{
468 enum usb_device_state state;
469 u32 wValue;
470 u32 wIndex;
471 int ret = 0;
472
473 wValue = le16_to_cpu(ctrl->wValue);
474 wIndex = le16_to_cpu(ctrl->wIndex);
475 state = dwc->gadget->state;
476
477 switch (wValue) {
478 case USB_DEVICE_REMOTE_WAKEUP:
479 break;
480 /*
481 * 9.4.1 says only for SS, in AddressState only for
482 * default control pipe
483 */
484 case USB_DEVICE_U1_ENABLE:
485 ret = dwc3_ep0_handle_u1(dwc, state, set);
486 break;
487 case USB_DEVICE_U2_ENABLE:
488 ret = dwc3_ep0_handle_u2(dwc, state, set);
489 break;
490 case USB_DEVICE_LTM_ENABLE:
491 ret = -EINVAL;
492 break;
493 case USB_DEVICE_TEST_MODE:
494 ret = dwc3_ep0_handle_test(dwc, state, wIndex, set);
495 break;
496 default:
497 ret = -EINVAL;
498 }
499
500 return ret;
501}
502
503static int dwc3_ep0_handle_intf(struct dwc3 *dwc,
504 struct usb_ctrlrequest *ctrl, int set)
505{
506 u32 wValue;
507 int ret = 0;
508
509 wValue = le16_to_cpu(ctrl->wValue);
510
511 switch (wValue) {
512 case USB_INTRF_FUNC_SUSPEND:
513 /*
514 * REVISIT: Ideally we would enable some low power mode here,
515 * however it's unclear what we should be doing here.
516 *
517 * For now, we're not doing anything, just making sure we return
518 * 0 so USB Command Verifier tests pass without any errors.
519 */
520 break;
521 default:
522 ret = -EINVAL;
523 }
524
525 return ret;
526}
527
528static int dwc3_ep0_handle_endpoint(struct dwc3 *dwc,
529 struct usb_ctrlrequest *ctrl, int set)
530{
531 struct dwc3_ep *dep;
532 u32 wValue;
533 int ret;
534
535 wValue = le16_to_cpu(ctrl->wValue);
536
537 switch (wValue) {
538 case USB_ENDPOINT_HALT:
539 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
540 if (!dep)
541 return -EINVAL;
542
543 if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
544 break;
545
546 ret = __dwc3_gadget_ep_set_halt(dep, set, true);
547 if (ret)
548 return -EINVAL;
549
550 /* ClearFeature(Halt) may need delayed status */
551 if (!set && (dep->flags & DWC3_EP_END_TRANSFER_PENDING))
552 return USB_GADGET_DELAYED_STATUS;
553
554 break;
555 default:
556 return -EINVAL;
557 }
558
559 return 0;
560}
561
562static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
563 struct usb_ctrlrequest *ctrl, int set)
564{
565 u32 recip;
566 int ret;
567
568 recip = ctrl->bRequestType & USB_RECIP_MASK;
569
570 switch (recip) {
571 case USB_RECIP_DEVICE:
572 ret = dwc3_ep0_handle_device(dwc, ctrl, set);
573 break;
574 case USB_RECIP_INTERFACE:
575 ret = dwc3_ep0_handle_intf(dwc, ctrl, set);
576 break;
577 case USB_RECIP_ENDPOINT:
578 ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set);
579 break;
580 default:
581 ret = -EINVAL;
582 }
583
584 return ret;
585}
586
587static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
588{
589 enum usb_device_state state = dwc->gadget->state;
590 u32 addr;
591 u32 reg;
592
593 addr = le16_to_cpu(ctrl->wValue);
594 if (addr > 127) {
595 dev_err(dwc->dev, "invalid device address %d\n", addr);
596 return -EINVAL;
597 }
598
599 if (state == USB_STATE_CONFIGURED) {
600 dev_err(dwc->dev, "can't SetAddress() from Configured State\n");
601 return -EINVAL;
602 }
603
604 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
605 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
606 reg |= DWC3_DCFG_DEVADDR(addr);
607 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
608
609 if (addr)
610 usb_gadget_set_state(dwc->gadget, USB_STATE_ADDRESS);
611 else
612 usb_gadget_set_state(dwc->gadget, USB_STATE_DEFAULT);
613
614 return 0;
615}
616
617static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
618{
619 int ret = -EINVAL;
620
621 if (dwc->async_callbacks) {
622 spin_unlock(&dwc->lock);
623 ret = dwc->gadget_driver->setup(dwc->gadget, ctrl);
624 spin_lock(&dwc->lock);
625 }
626 return ret;
627}
628
629static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
630{
631 enum usb_device_state state = dwc->gadget->state;
632 u32 cfg;
633 int ret;
634 u32 reg;
635
636 cfg = le16_to_cpu(ctrl->wValue);
637
638 switch (state) {
639 case USB_STATE_DEFAULT:
640 return -EINVAL;
641
642 case USB_STATE_ADDRESS:
643 dwc3_gadget_clear_tx_fifos(dwc);
644
645 ret = dwc3_ep0_delegate_req(dwc, ctrl);
646 /* if the cfg matches and the cfg is non zero */
647 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
648
649 /*
650 * only change state if set_config has already
651 * been processed. If gadget driver returns
652 * USB_GADGET_DELAYED_STATUS, we will wait
653 * to change the state on the next usb_ep_queue()
654 */
655 if (ret == 0)
656 usb_gadget_set_state(dwc->gadget,
657 USB_STATE_CONFIGURED);
658
659 /*
660 * Enable transition to U1/U2 state when
661 * nothing is pending from application.
662 */
663 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
664 if (!dwc->dis_u1_entry_quirk)
665 reg |= DWC3_DCTL_ACCEPTU1ENA;
666 if (!dwc->dis_u2_entry_quirk)
667 reg |= DWC3_DCTL_ACCEPTU2ENA;
668 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
669 }
670 break;
671
672 case USB_STATE_CONFIGURED:
673 ret = dwc3_ep0_delegate_req(dwc, ctrl);
674 if (!cfg && !ret)
675 usb_gadget_set_state(dwc->gadget,
676 USB_STATE_ADDRESS);
677 break;
678 default:
679 ret = -EINVAL;
680 }
681 return ret;
682}
683
684static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
685{
686 struct dwc3_ep *dep = to_dwc3_ep(ep);
687 struct dwc3 *dwc = dep->dwc;
688
689 u32 param = 0;
690 u32 reg;
691
692 struct timing {
693 u8 u1sel;
694 u8 u1pel;
695 __le16 u2sel;
696 __le16 u2pel;
697 } __packed timing;
698
699 int ret;
700
701 memcpy(&timing, req->buf, sizeof(timing));
702
703 dwc->u1sel = timing.u1sel;
704 dwc->u1pel = timing.u1pel;
705 dwc->u2sel = le16_to_cpu(timing.u2sel);
706 dwc->u2pel = le16_to_cpu(timing.u2pel);
707
708 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
709 if (reg & DWC3_DCTL_INITU2ENA)
710 param = dwc->u2pel;
711 if (reg & DWC3_DCTL_INITU1ENA)
712 param = dwc->u1pel;
713
714 /*
715 * According to Synopsys Databook, if parameter is
716 * greater than 125, a value of zero should be
717 * programmed in the register.
718 */
719 if (param > 125)
720 param = 0;
721
722 /* now that we have the time, issue DGCMD Set Sel */
723 ret = dwc3_send_gadget_generic_command(dwc,
724 DWC3_DGCMD_SET_PERIODIC_PAR, param);
725 WARN_ON(ret < 0);
726}
727
728static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
729{
730 struct dwc3_ep *dep;
731 enum usb_device_state state = dwc->gadget->state;
732 u16 wLength;
733
734 if (state == USB_STATE_DEFAULT)
735 return -EINVAL;
736
737 wLength = le16_to_cpu(ctrl->wLength);
738
739 if (wLength != 6) {
740 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
741 wLength);
742 return -EINVAL;
743 }
744
745 /*
746 * To handle Set SEL we need to receive 6 bytes from Host. So let's
747 * queue a usb_request for 6 bytes.
748 *
749 * Remember, though, this controller can't handle non-wMaxPacketSize
750 * aligned transfers on the OUT direction, so we queue a request for
751 * wMaxPacketSize instead.
752 */
753 dep = dwc->eps[0];
754 dwc->ep0_usb_req.dep = dep;
755 dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
756 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
757 dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
758
759 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
760}
761
762static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
763{
764 u16 wLength;
765 u16 wValue;
766 u16 wIndex;
767
768 wValue = le16_to_cpu(ctrl->wValue);
769 wLength = le16_to_cpu(ctrl->wLength);
770 wIndex = le16_to_cpu(ctrl->wIndex);
771
772 if (wIndex || wLength)
773 return -EINVAL;
774
775 dwc->gadget->isoch_delay = wValue;
776
777 return 0;
778}
779
780static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
781{
782 int ret;
783
784 switch (ctrl->bRequest) {
785 case USB_REQ_GET_STATUS:
786 ret = dwc3_ep0_handle_status(dwc, ctrl);
787 break;
788 case USB_REQ_CLEAR_FEATURE:
789 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
790 break;
791 case USB_REQ_SET_FEATURE:
792 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
793 break;
794 case USB_REQ_SET_ADDRESS:
795 ret = dwc3_ep0_set_address(dwc, ctrl);
796 break;
797 case USB_REQ_SET_CONFIGURATION:
798 ret = dwc3_ep0_set_config(dwc, ctrl);
799 break;
800 case USB_REQ_SET_SEL:
801 ret = dwc3_ep0_set_sel(dwc, ctrl);
802 break;
803 case USB_REQ_SET_ISOCH_DELAY:
804 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
805 break;
806 default:
807 ret = dwc3_ep0_delegate_req(dwc, ctrl);
808 break;
809 }
810
811 return ret;
812}
813
814static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
815 const struct dwc3_event_depevt *event)
816{
817 struct usb_ctrlrequest *ctrl = (void *) dwc->ep0_trb;
818 int ret = -EINVAL;
819 u32 len;
820
821 if (!dwc->gadget_driver || !dwc->softconnect || !dwc->connected)
822 goto out;
823
824 trace_dwc3_ctrl_req(ctrl);
825
826 len = le16_to_cpu(ctrl->wLength);
827 if (!len) {
828 dwc->three_stage_setup = false;
829 dwc->ep0_expect_in = false;
830 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
831 } else {
832 dwc->three_stage_setup = true;
833 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
834 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
835 }
836
837 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
838 ret = dwc3_ep0_std_request(dwc, ctrl);
839 else
840 ret = dwc3_ep0_delegate_req(dwc, ctrl);
841
842 if (ret == USB_GADGET_DELAYED_STATUS)
843 dwc->delayed_status = true;
844
845out:
846 if (ret < 0)
847 dwc3_ep0_stall_and_restart(dwc);
848}
849
850static void dwc3_ep0_complete_data(struct dwc3 *dwc,
851 const struct dwc3_event_depevt *event)
852{
853 struct dwc3_request *r;
854 struct usb_request *ur;
855 struct dwc3_trb *trb;
856 struct dwc3_ep *ep0;
857 u32 transferred = 0;
858 u32 status;
859 u32 length;
860 u8 epnum;
861
862 epnum = event->endpoint_number;
863 ep0 = dwc->eps[0];
864
865 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
866 trb = dwc->ep0_trb;
867 trace_dwc3_complete_trb(ep0, trb);
868
869 r = next_request(&ep0->pending_list);
870 if (!r)
871 return;
872
873 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
874 if (status == DWC3_TRBSTS_SETUP_PENDING) {
875 dwc->setup_packet_pending = true;
876 if (r)
877 dwc3_gadget_giveback(ep0, r, -ECONNRESET);
878
879 return;
880 }
881
882 ur = &r->request;
883
884 length = trb->size & DWC3_TRB_SIZE_MASK;
885 transferred = ur->length - length;
886 ur->actual += transferred;
887
888 if ((IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) &&
889 ur->length && ur->zero) || dwc->ep0_bounced) {
890 trb++;
891 trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
892 trace_dwc3_complete_trb(ep0, trb);
893
894 if (r->direction)
895 dwc->eps[1]->trb_enqueue = 0;
896 else
897 dwc->eps[0]->trb_enqueue = 0;
898
899 dwc->ep0_bounced = false;
900 }
901
902 if ((epnum & 1) && ur->actual < ur->length)
903 dwc3_ep0_stall_and_restart(dwc);
904 else
905 dwc3_gadget_giveback(ep0, r, 0);
906}
907
908static void dwc3_ep0_complete_status(struct dwc3 *dwc,
909 const struct dwc3_event_depevt *event)
910{
911 struct dwc3_request *r;
912 struct dwc3_ep *dep;
913 struct dwc3_trb *trb;
914 u32 status;
915
916 dep = dwc->eps[0];
917 trb = dwc->ep0_trb;
918
919 trace_dwc3_complete_trb(dep, trb);
920
921 if (!list_empty(&dep->pending_list)) {
922 r = next_request(&dep->pending_list);
923
924 dwc3_gadget_giveback(dep, r, 0);
925 }
926
927 if (dwc->test_mode) {
928 int ret;
929
930 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
931 if (ret < 0) {
932 dev_err(dwc->dev, "invalid test #%d\n",
933 dwc->test_mode_nr);
934 dwc3_ep0_stall_and_restart(dwc);
935 return;
936 }
937 }
938
939 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
940 if (status == DWC3_TRBSTS_SETUP_PENDING)
941 dwc->setup_packet_pending = true;
942
943 dwc->ep0state = EP0_SETUP_PHASE;
944 dwc3_ep0_out_start(dwc);
945}
946
947static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
948 const struct dwc3_event_depevt *event)
949{
950 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
951
952 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
953 dep->resource_index = 0;
954 dwc->setup_packet_pending = false;
955
956 switch (dwc->ep0state) {
957 case EP0_SETUP_PHASE:
958 dwc3_ep0_inspect_setup(dwc, event);
959 break;
960
961 case EP0_DATA_PHASE:
962 dwc3_ep0_complete_data(dwc, event);
963 break;
964
965 case EP0_STATUS_PHASE:
966 dwc3_ep0_complete_status(dwc, event);
967 break;
968 default:
969 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
970 }
971}
972
973static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
974 struct dwc3_ep *dep, struct dwc3_request *req)
975{
976 unsigned int trb_length = 0;
977 int ret;
978
979 req->direction = !!dep->number;
980
981 if (req->request.length == 0) {
982 if (!req->direction)
983 trb_length = dep->endpoint.maxpacket;
984
985 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr, trb_length,
986 DWC3_TRBCTL_CONTROL_DATA, false);
987 ret = dwc3_ep0_start_trans(dep);
988 } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
989 && (dep->number == 0)) {
990 u32 maxpacket;
991 u32 rem;
992
993 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
994 &req->request, dep->number);
995 if (ret)
996 return;
997
998 maxpacket = dep->endpoint.maxpacket;
999 rem = req->request.length % maxpacket;
1000 dwc->ep0_bounced = true;
1001
1002 /* prepare normal TRB */
1003 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
1004 req->request.length,
1005 DWC3_TRBCTL_CONTROL_DATA,
1006 true);
1007
1008 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1];
1009
1010 /* Now prepare one extra TRB to align transfer size */
1011 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr,
1012 maxpacket - rem,
1013 DWC3_TRBCTL_CONTROL_DATA,
1014 false);
1015 ret = dwc3_ep0_start_trans(dep);
1016 } else if (IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) &&
1017 req->request.length && req->request.zero) {
1018
1019 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1020 &req->request, dep->number);
1021 if (ret)
1022 return;
1023
1024 /* prepare normal TRB */
1025 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
1026 req->request.length,
1027 DWC3_TRBCTL_CONTROL_DATA,
1028 true);
1029
1030 req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1];
1031
1032 if (!req->direction)
1033 trb_length = dep->endpoint.maxpacket;
1034
1035 /* Now prepare one extra TRB to align transfer size */
1036 dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr,
1037 trb_length, DWC3_TRBCTL_CONTROL_DATA,
1038 false);
1039 ret = dwc3_ep0_start_trans(dep);
1040 } else {
1041 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1042 &req->request, dep->number);
1043 if (ret)
1044 return;
1045
1046 dwc3_ep0_prepare_one_trb(dep, req->request.dma,
1047 req->request.length, DWC3_TRBCTL_CONTROL_DATA,
1048 false);
1049
1050 req->trb = &dwc->ep0_trb[dep->trb_enqueue];
1051
1052 ret = dwc3_ep0_start_trans(dep);
1053 }
1054
1055 WARN_ON(ret < 0);
1056}
1057
1058static int dwc3_ep0_start_control_status(struct dwc3_ep *dep)
1059{
1060 struct dwc3 *dwc = dep->dwc;
1061 u32 type;
1062
1063 type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3
1064 : DWC3_TRBCTL_CONTROL_STATUS2;
1065
1066 dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 0, type, false);
1067 return dwc3_ep0_start_trans(dep);
1068}
1069
1070static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
1071{
1072 WARN_ON(dwc3_ep0_start_control_status(dep));
1073}
1074
1075static void dwc3_ep0_do_control_status(struct dwc3 *dwc,
1076 const struct dwc3_event_depevt *event)
1077{
1078 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
1079
1080 __dwc3_ep0_do_control_status(dwc, dep);
1081}
1082
1083void dwc3_ep0_send_delayed_status(struct dwc3 *dwc)
1084{
1085 unsigned int direction = !dwc->ep0_expect_in;
1086
1087 dwc->delayed_status = false;
1088 dwc->clear_stall_protocol = 0;
1089
1090 if (dwc->ep0state != EP0_STATUS_PHASE)
1091 return;
1092
1093 __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
1094}
1095
1096void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep)
1097{
1098 struct dwc3_gadget_ep_cmd_params params;
1099 u32 cmd;
1100 int ret;
1101
1102 /*
1103 * For status/DATA OUT stage, TRB will be queued on ep0 out
1104 * endpoint for which resource index is zero. Hence allow
1105 * queuing ENDXFER command for ep0 out endpoint.
1106 */
1107 if (!dep->resource_index && dep->number)
1108 return;
1109
1110 cmd = DWC3_DEPCMD_ENDTRANSFER;
1111 cmd |= DWC3_DEPCMD_CMDIOC;
1112 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1113 memset(¶ms, 0, sizeof(params));
1114 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1115 WARN_ON_ONCE(ret);
1116 dep->resource_index = 0;
1117}
1118
1119static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
1120 const struct dwc3_event_depevt *event)
1121{
1122 switch (event->status) {
1123 case DEPEVT_STATUS_CONTROL_DATA:
1124 if (!dwc->softconnect || !dwc->connected)
1125 return;
1126 /*
1127 * We already have a DATA transfer in the controller's cache,
1128 * if we receive a XferNotReady(DATA) we will ignore it, unless
1129 * it's for the wrong direction.
1130 *
1131 * In that case, we must issue END_TRANSFER command to the Data
1132 * Phase we already have started and issue SetStall on the
1133 * control endpoint.
1134 */
1135 if (dwc->ep0_expect_in != event->endpoint_number) {
1136 struct dwc3_ep *dep = dwc->eps[dwc->ep0_expect_in];
1137
1138 dev_err(dwc->dev, "unexpected direction for Data Phase\n");
1139 dwc3_ep0_end_control_data(dwc, dep);
1140 dwc3_ep0_stall_and_restart(dwc);
1141 return;
1142 }
1143
1144 break;
1145
1146 case DEPEVT_STATUS_CONTROL_STATUS:
1147 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
1148 return;
1149
1150 if (dwc->setup_packet_pending) {
1151 dwc3_ep0_stall_and_restart(dwc);
1152 return;
1153 }
1154
1155 dwc->ep0state = EP0_STATUS_PHASE;
1156
1157 if (dwc->delayed_status) {
1158 struct dwc3_ep *dep = dwc->eps[0];
1159
1160 WARN_ON_ONCE(event->endpoint_number != 1);
1161 /*
1162 * We should handle the delay STATUS phase here if the
1163 * request for handling delay STATUS has been queued
1164 * into the list.
1165 */
1166 if (!list_empty(&dep->pending_list)) {
1167 dwc->delayed_status = false;
1168 usb_gadget_set_state(dwc->gadget,
1169 USB_STATE_CONFIGURED);
1170 dwc3_ep0_do_control_status(dwc, event);
1171 }
1172
1173 return;
1174 }
1175
1176 dwc3_ep0_do_control_status(dwc, event);
1177 }
1178}
1179
1180void dwc3_ep0_interrupt(struct dwc3 *dwc,
1181 const struct dwc3_event_depevt *event)
1182{
1183 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
1184 u8 cmd;
1185
1186 switch (event->endpoint_event) {
1187 case DWC3_DEPEVT_XFERCOMPLETE:
1188 dwc3_ep0_xfer_complete(dwc, event);
1189 break;
1190
1191 case DWC3_DEPEVT_XFERNOTREADY:
1192 dwc3_ep0_xfernotready(dwc, event);
1193 break;
1194
1195 case DWC3_DEPEVT_XFERINPROGRESS:
1196 case DWC3_DEPEVT_RXTXFIFOEVT:
1197 case DWC3_DEPEVT_STREAMEVT:
1198 break;
1199 case DWC3_DEPEVT_EPCMDCMPLT:
1200 cmd = DEPEVT_PARAMETER_CMD(event->parameters);
1201
1202 if (cmd == DWC3_DEPCMD_ENDTRANSFER) {
1203 dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
1204 dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
1205 }
1206 break;
1207 }
1208}
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 "debug.h"
35#include "gadget.h"
36#include "io.h"
37
38static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
39static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
40 struct dwc3_ep *dep, struct dwc3_request *req);
41
42static void dwc3_ep0_prepare_one_trb(struct dwc3 *dwc, u8 epnum,
43 dma_addr_t buf_dma, u32 len, u32 type, bool chain)
44{
45 struct dwc3_trb *trb;
46 struct dwc3_ep *dep;
47
48 dep = dwc->eps[epnum];
49
50 trb = &dwc->ep0_trb[dep->trb_enqueue];
51
52 if (chain)
53 dep->trb_enqueue++;
54
55 trb->bpl = lower_32_bits(buf_dma);
56 trb->bph = upper_32_bits(buf_dma);
57 trb->size = len;
58 trb->ctrl = type;
59
60 trb->ctrl |= (DWC3_TRB_CTRL_HWO
61 | DWC3_TRB_CTRL_ISP_IMI);
62
63 if (chain)
64 trb->ctrl |= DWC3_TRB_CTRL_CHN;
65 else
66 trb->ctrl |= (DWC3_TRB_CTRL_IOC
67 | DWC3_TRB_CTRL_LST);
68
69 trace_dwc3_prepare_trb(dep, trb);
70}
71
72static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum)
73{
74 struct dwc3_gadget_ep_cmd_params params;
75 struct dwc3_ep *dep;
76 int ret;
77
78 dep = dwc->eps[epnum];
79 if (dep->flags & DWC3_EP_BUSY)
80 return 0;
81
82 memset(¶ms, 0, sizeof(params));
83 params.param0 = upper_32_bits(dwc->ep0_trb_addr);
84 params.param1 = lower_32_bits(dwc->ep0_trb_addr);
85
86 ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_STARTTRANSFER, ¶ms);
87 if (ret < 0)
88 return ret;
89
90 dep->flags |= DWC3_EP_BUSY;
91 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
92 dwc->ep0_next_event = DWC3_EP0_COMPLETE;
93
94 return 0;
95}
96
97static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep,
98 struct dwc3_request *req)
99{
100 struct dwc3 *dwc = dep->dwc;
101
102 req->request.actual = 0;
103 req->request.status = -EINPROGRESS;
104 req->epnum = dep->number;
105
106 list_add_tail(&req->list, &dep->pending_list);
107
108 /*
109 * Gadget driver might not be quick enough to queue a request
110 * before we get a Transfer Not Ready event on this endpoint.
111 *
112 * In that case, we will set DWC3_EP_PENDING_REQUEST. When that
113 * flag is set, it's telling us that as soon as Gadget queues the
114 * required request, we should kick the transfer here because the
115 * IRQ we were waiting for is long gone.
116 */
117 if (dep->flags & DWC3_EP_PENDING_REQUEST) {
118 unsigned direction;
119
120 direction = !!(dep->flags & DWC3_EP0_DIR_IN);
121
122 if (dwc->ep0state != EP0_DATA_PHASE) {
123 dev_WARN(dwc->dev, "Unexpected pending request\n");
124 return 0;
125 }
126
127 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
128
129 dep->flags &= ~(DWC3_EP_PENDING_REQUEST |
130 DWC3_EP0_DIR_IN);
131
132 return 0;
133 }
134
135 /*
136 * In case gadget driver asked us to delay the STATUS phase,
137 * handle it here.
138 */
139 if (dwc->delayed_status) {
140 unsigned direction;
141
142 direction = !dwc->ep0_expect_in;
143 dwc->delayed_status = false;
144 usb_gadget_set_state(&dwc->gadget, USB_STATE_CONFIGURED);
145
146 if (dwc->ep0state == EP0_STATUS_PHASE)
147 __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
148
149 return 0;
150 }
151
152 /*
153 * Unfortunately we have uncovered a limitation wrt the Data Phase.
154 *
155 * Section 9.4 says we can wait for the XferNotReady(DATA) event to
156 * come before issueing Start Transfer command, but if we do, we will
157 * miss situations where the host starts another SETUP phase instead of
158 * the DATA phase. Such cases happen at least on TD.7.6 of the Link
159 * Layer Compliance Suite.
160 *
161 * The problem surfaces due to the fact that in case of back-to-back
162 * SETUP packets there will be no XferNotReady(DATA) generated and we
163 * will be stuck waiting for XferNotReady(DATA) forever.
164 *
165 * By looking at tables 9-13 and 9-14 of the Databook, we can see that
166 * it tells us to start Data Phase right away. It also mentions that if
167 * we receive a SETUP phase instead of the DATA phase, core will issue
168 * XferComplete for the DATA phase, before actually initiating it in
169 * the wire, with the TRB's status set to "SETUP_PENDING". Such status
170 * can only be used to print some debugging logs, as the core expects
171 * us to go through to the STATUS phase and start a CONTROL_STATUS TRB,
172 * just so it completes right away, without transferring anything and,
173 * only then, we can go back to the SETUP phase.
174 *
175 * Because of this scenario, SNPS decided to change the programming
176 * model of control transfers and support on-demand transfers only for
177 * the STATUS phase. To fix the issue we have now, we will always wait
178 * for gadget driver to queue the DATA phase's struct usb_request, then
179 * start it right away.
180 *
181 * If we're actually in a 2-stage transfer, we will wait for
182 * XferNotReady(STATUS).
183 */
184 if (dwc->three_stage_setup) {
185 unsigned direction;
186
187 direction = dwc->ep0_expect_in;
188 dwc->ep0state = EP0_DATA_PHASE;
189
190 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
191
192 dep->flags &= ~DWC3_EP0_DIR_IN;
193 }
194
195 return 0;
196}
197
198int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
199 gfp_t gfp_flags)
200{
201 struct dwc3_request *req = to_dwc3_request(request);
202 struct dwc3_ep *dep = to_dwc3_ep(ep);
203 struct dwc3 *dwc = dep->dwc;
204
205 unsigned long flags;
206
207 int ret;
208
209 spin_lock_irqsave(&dwc->lock, flags);
210 if (!dep->endpoint.desc) {
211 dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
212 dep->name);
213 ret = -ESHUTDOWN;
214 goto out;
215 }
216
217 /* we share one TRB for ep0/1 */
218 if (!list_empty(&dep->pending_list)) {
219 ret = -EBUSY;
220 goto out;
221 }
222
223 ret = __dwc3_gadget_ep0_queue(dep, req);
224
225out:
226 spin_unlock_irqrestore(&dwc->lock, flags);
227
228 return ret;
229}
230
231static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
232{
233 struct dwc3_ep *dep;
234
235 /* reinitialize physical ep1 */
236 dep = dwc->eps[1];
237 dep->flags = DWC3_EP_ENABLED;
238
239 /* stall is always issued on EP0 */
240 dep = dwc->eps[0];
241 __dwc3_gadget_ep_set_halt(dep, 1, false);
242 dep->flags = DWC3_EP_ENABLED;
243 dwc->delayed_status = false;
244
245 if (!list_empty(&dep->pending_list)) {
246 struct dwc3_request *req;
247
248 req = next_request(&dep->pending_list);
249 dwc3_gadget_giveback(dep, req, -ECONNRESET);
250 }
251
252 dwc->ep0state = EP0_SETUP_PHASE;
253 dwc3_ep0_out_start(dwc);
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
261 dwc3_ep0_stall_and_restart(dwc);
262
263 return 0;
264}
265
266int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
267{
268 struct dwc3_ep *dep = to_dwc3_ep(ep);
269 struct dwc3 *dwc = dep->dwc;
270 unsigned long flags;
271 int ret;
272
273 spin_lock_irqsave(&dwc->lock, flags);
274 ret = __dwc3_gadget_ep0_set_halt(ep, value);
275 spin_unlock_irqrestore(&dwc->lock, flags);
276
277 return ret;
278}
279
280void dwc3_ep0_out_start(struct dwc3 *dwc)
281{
282 int ret;
283
284 complete(&dwc->ep0_in_setup);
285
286 dwc3_ep0_prepare_one_trb(dwc, 0, dwc->ctrl_req_addr, 8,
287 DWC3_TRBCTL_CONTROL_SETUP, false);
288 ret = dwc3_ep0_start_trans(dwc, 0);
289 WARN_ON(ret < 0);
290}
291
292static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
293{
294 struct dwc3_ep *dep;
295 u32 windex = le16_to_cpu(wIndex_le);
296 u32 epnum;
297
298 epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1;
299 if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
300 epnum |= 1;
301
302 dep = dwc->eps[epnum];
303 if (dep->flags & DWC3_EP_ENABLED)
304 return dep;
305
306 return NULL;
307}
308
309static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
310{
311}
312/*
313 * ch 9.4.5
314 */
315static int dwc3_ep0_handle_status(struct dwc3 *dwc,
316 struct usb_ctrlrequest *ctrl)
317{
318 struct dwc3_ep *dep;
319 u32 recip;
320 u32 reg;
321 u16 usb_status = 0;
322 __le16 *response_pkt;
323
324 recip = ctrl->bRequestType & USB_RECIP_MASK;
325 switch (recip) {
326 case USB_RECIP_DEVICE:
327 /*
328 * LTM will be set once we know how to set this in HW.
329 */
330 usb_status |= dwc->gadget.is_selfpowered;
331
332 if ((dwc->speed == DWC3_DSTS_SUPERSPEED) ||
333 (dwc->speed == DWC3_DSTS_SUPERSPEED_PLUS)) {
334 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
335 if (reg & DWC3_DCTL_INITU1ENA)
336 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
337 if (reg & DWC3_DCTL_INITU2ENA)
338 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
339 }
340
341 break;
342
343 case USB_RECIP_INTERFACE:
344 /*
345 * Function Remote Wake Capable D0
346 * Function Remote Wakeup D1
347 */
348 break;
349
350 case USB_RECIP_ENDPOINT:
351 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
352 if (!dep)
353 return -EINVAL;
354
355 if (dep->flags & DWC3_EP_STALL)
356 usb_status = 1 << USB_ENDPOINT_HALT;
357 break;
358 default:
359 return -EINVAL;
360 }
361
362 response_pkt = (__le16 *) dwc->setup_buf;
363 *response_pkt = cpu_to_le16(usb_status);
364
365 dep = dwc->eps[0];
366 dwc->ep0_usb_req.dep = dep;
367 dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
368 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
369 dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
370
371 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
372}
373
374static int dwc3_ep0_handle_u1(struct dwc3 *dwc, enum usb_device_state state,
375 int set)
376{
377 u32 reg;
378
379 if (state != USB_STATE_CONFIGURED)
380 return -EINVAL;
381 if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
382 (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
383 return -EINVAL;
384
385 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
386 if (set)
387 reg |= DWC3_DCTL_INITU1ENA;
388 else
389 reg &= ~DWC3_DCTL_INITU1ENA;
390 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
391
392 return 0;
393}
394
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
407 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
408 if (set)
409 reg |= DWC3_DCTL_INITU2ENA;
410 else
411 reg &= ~DWC3_DCTL_INITU2ENA;
412 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
413
414 return 0;
415}
416
417static int dwc3_ep0_handle_test(struct dwc3 *dwc, enum usb_device_state state,
418 u32 wIndex, int set)
419{
420 if ((wIndex & 0xff) != 0)
421 return -EINVAL;
422 if (!set)
423 return -EINVAL;
424
425 switch (wIndex >> 8) {
426 case TEST_J:
427 case TEST_K:
428 case TEST_SE0_NAK:
429 case TEST_PACKET:
430 case TEST_FORCE_EN:
431 dwc->test_mode_nr = wIndex >> 8;
432 dwc->test_mode = true;
433 break;
434 default:
435 return -EINVAL;
436 }
437
438 return 0;
439}
440
441static int dwc3_ep0_handle_device(struct dwc3 *dwc,
442 struct usb_ctrlrequest *ctrl, int set)
443{
444 enum usb_device_state state;
445 u32 wValue;
446 u32 wIndex;
447 int ret = 0;
448
449 wValue = le16_to_cpu(ctrl->wValue);
450 wIndex = le16_to_cpu(ctrl->wIndex);
451 state = dwc->gadget.state;
452
453 switch (wValue) {
454 case USB_DEVICE_REMOTE_WAKEUP:
455 break;
456 /*
457 * 9.4.1 says only only for SS, in AddressState only for
458 * default control pipe
459 */
460 case USB_DEVICE_U1_ENABLE:
461 ret = dwc3_ep0_handle_u1(dwc, state, set);
462 break;
463 case USB_DEVICE_U2_ENABLE:
464 ret = dwc3_ep0_handle_u2(dwc, state, set);
465 break;
466 case USB_DEVICE_LTM_ENABLE:
467 ret = -EINVAL;
468 break;
469 case USB_DEVICE_TEST_MODE:
470 ret = dwc3_ep0_handle_test(dwc, state, wIndex, set);
471 break;
472 default:
473 ret = -EINVAL;
474 }
475
476 return ret;
477}
478
479static int dwc3_ep0_handle_intf(struct dwc3 *dwc,
480 struct usb_ctrlrequest *ctrl, int set)
481{
482 enum usb_device_state state;
483 u32 wValue;
484 u32 wIndex;
485 int ret = 0;
486
487 wValue = le16_to_cpu(ctrl->wValue);
488 wIndex = le16_to_cpu(ctrl->wIndex);
489 state = dwc->gadget.state;
490
491 switch (wValue) {
492 case USB_INTRF_FUNC_SUSPEND:
493 /*
494 * REVISIT: Ideally we would enable some low power mode here,
495 * however it's unclear what we should be doing here.
496 *
497 * For now, we're not doing anything, just making sure we return
498 * 0 so USB Command Verifier tests pass without any errors.
499 */
500 break;
501 default:
502 ret = -EINVAL;
503 }
504
505 return ret;
506}
507
508static int dwc3_ep0_handle_endpoint(struct dwc3 *dwc,
509 struct usb_ctrlrequest *ctrl, int set)
510{
511 struct dwc3_ep *dep;
512 enum usb_device_state state;
513 u32 wValue;
514 u32 wIndex;
515 int ret;
516
517 wValue = le16_to_cpu(ctrl->wValue);
518 wIndex = le16_to_cpu(ctrl->wIndex);
519 state = dwc->gadget.state;
520
521 switch (wValue) {
522 case USB_ENDPOINT_HALT:
523 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
524 if (!dep)
525 return -EINVAL;
526
527 if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
528 break;
529
530 ret = __dwc3_gadget_ep_set_halt(dep, set, true);
531 if (ret)
532 return -EINVAL;
533 break;
534 default:
535 return -EINVAL;
536 }
537
538 return 0;
539}
540
541static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
542 struct usb_ctrlrequest *ctrl, int set)
543{
544 u32 recip;
545 int ret;
546 enum usb_device_state state;
547
548 recip = ctrl->bRequestType & USB_RECIP_MASK;
549 state = dwc->gadget.state;
550
551 switch (recip) {
552 case USB_RECIP_DEVICE:
553 ret = dwc3_ep0_handle_device(dwc, ctrl, set);
554 break;
555 case USB_RECIP_INTERFACE:
556 ret = dwc3_ep0_handle_intf(dwc, ctrl, set);
557 break;
558 case USB_RECIP_ENDPOINT:
559 ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set);
560 break;
561 default:
562 ret = -EINVAL;
563 }
564
565 return ret;
566}
567
568static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
569{
570 enum usb_device_state state = dwc->gadget.state;
571 u32 addr;
572 u32 reg;
573
574 addr = le16_to_cpu(ctrl->wValue);
575 if (addr > 127) {
576 dev_err(dwc->dev, "invalid device address %d\n", addr);
577 return -EINVAL;
578 }
579
580 if (state == USB_STATE_CONFIGURED) {
581 dev_err(dwc->dev, "can't SetAddress() from Configured State\n");
582 return -EINVAL;
583 }
584
585 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
586 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
587 reg |= DWC3_DCFG_DEVADDR(addr);
588 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
589
590 if (addr)
591 usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS);
592 else
593 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
594
595 return 0;
596}
597
598static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
599{
600 int ret;
601
602 spin_unlock(&dwc->lock);
603 ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl);
604 spin_lock(&dwc->lock);
605 return ret;
606}
607
608static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
609{
610 enum usb_device_state state = dwc->gadget.state;
611 u32 cfg;
612 int ret;
613 u32 reg;
614
615 cfg = le16_to_cpu(ctrl->wValue);
616
617 switch (state) {
618 case USB_STATE_DEFAULT:
619 return -EINVAL;
620
621 case USB_STATE_ADDRESS:
622 ret = dwc3_ep0_delegate_req(dwc, ctrl);
623 /* if the cfg matches and the cfg is non zero */
624 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
625
626 /*
627 * only change state if set_config has already
628 * been processed. If gadget driver returns
629 * USB_GADGET_DELAYED_STATUS, we will wait
630 * to change the state on the next usb_ep_queue()
631 */
632 if (ret == 0)
633 usb_gadget_set_state(&dwc->gadget,
634 USB_STATE_CONFIGURED);
635
636 /*
637 * Enable transition to U1/U2 state when
638 * nothing is pending from application.
639 */
640 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
641 reg |= (DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA);
642 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
643 }
644 break;
645
646 case USB_STATE_CONFIGURED:
647 ret = dwc3_ep0_delegate_req(dwc, ctrl);
648 if (!cfg && !ret)
649 usb_gadget_set_state(&dwc->gadget,
650 USB_STATE_ADDRESS);
651 break;
652 default:
653 ret = -EINVAL;
654 }
655 return ret;
656}
657
658static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
659{
660 struct dwc3_ep *dep = to_dwc3_ep(ep);
661 struct dwc3 *dwc = dep->dwc;
662
663 u32 param = 0;
664 u32 reg;
665
666 struct timing {
667 u8 u1sel;
668 u8 u1pel;
669 __le16 u2sel;
670 __le16 u2pel;
671 } __packed timing;
672
673 int ret;
674
675 memcpy(&timing, req->buf, sizeof(timing));
676
677 dwc->u1sel = timing.u1sel;
678 dwc->u1pel = timing.u1pel;
679 dwc->u2sel = le16_to_cpu(timing.u2sel);
680 dwc->u2pel = le16_to_cpu(timing.u2pel);
681
682 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
683 if (reg & DWC3_DCTL_INITU2ENA)
684 param = dwc->u2pel;
685 if (reg & DWC3_DCTL_INITU1ENA)
686 param = dwc->u1pel;
687
688 /*
689 * According to Synopsys Databook, if parameter is
690 * greater than 125, a value of zero should be
691 * programmed in the register.
692 */
693 if (param > 125)
694 param = 0;
695
696 /* now that we have the time, issue DGCMD Set Sel */
697 ret = dwc3_send_gadget_generic_command(dwc,
698 DWC3_DGCMD_SET_PERIODIC_PAR, param);
699 WARN_ON(ret < 0);
700}
701
702static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
703{
704 struct dwc3_ep *dep;
705 enum usb_device_state state = dwc->gadget.state;
706 u16 wLength;
707 u16 wValue;
708
709 if (state == USB_STATE_DEFAULT)
710 return -EINVAL;
711
712 wValue = le16_to_cpu(ctrl->wValue);
713 wLength = le16_to_cpu(ctrl->wLength);
714
715 if (wLength != 6) {
716 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
717 wLength);
718 return -EINVAL;
719 }
720
721 /*
722 * To handle Set SEL we need to receive 6 bytes from Host. So let's
723 * queue a usb_request for 6 bytes.
724 *
725 * Remember, though, this controller can't handle non-wMaxPacketSize
726 * aligned transfers on the OUT direction, so we queue a request for
727 * wMaxPacketSize instead.
728 */
729 dep = dwc->eps[0];
730 dwc->ep0_usb_req.dep = dep;
731 dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
732 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
733 dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
734
735 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
736}
737
738static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
739{
740 u16 wLength;
741 u16 wValue;
742 u16 wIndex;
743
744 wValue = le16_to_cpu(ctrl->wValue);
745 wLength = le16_to_cpu(ctrl->wLength);
746 wIndex = le16_to_cpu(ctrl->wIndex);
747
748 if (wIndex || wLength)
749 return -EINVAL;
750
751 /*
752 * REVISIT It's unclear from Databook what to do with this
753 * value. For now, just cache it.
754 */
755 dwc->isoch_delay = wValue;
756
757 return 0;
758}
759
760static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
761{
762 int ret;
763
764 switch (ctrl->bRequest) {
765 case USB_REQ_GET_STATUS:
766 ret = dwc3_ep0_handle_status(dwc, ctrl);
767 break;
768 case USB_REQ_CLEAR_FEATURE:
769 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
770 break;
771 case USB_REQ_SET_FEATURE:
772 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
773 break;
774 case USB_REQ_SET_ADDRESS:
775 ret = dwc3_ep0_set_address(dwc, ctrl);
776 break;
777 case USB_REQ_SET_CONFIGURATION:
778 ret = dwc3_ep0_set_config(dwc, ctrl);
779 break;
780 case USB_REQ_SET_SEL:
781 ret = dwc3_ep0_set_sel(dwc, ctrl);
782 break;
783 case USB_REQ_SET_ISOCH_DELAY:
784 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
785 break;
786 default:
787 ret = dwc3_ep0_delegate_req(dwc, ctrl);
788 break;
789 }
790
791 return ret;
792}
793
794static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
795 const struct dwc3_event_depevt *event)
796{
797 struct usb_ctrlrequest *ctrl = dwc->ctrl_req;
798 int ret = -EINVAL;
799 u32 len;
800
801 if (!dwc->gadget_driver)
802 goto out;
803
804 trace_dwc3_ctrl_req(ctrl);
805
806 len = le16_to_cpu(ctrl->wLength);
807 if (!len) {
808 dwc->three_stage_setup = false;
809 dwc->ep0_expect_in = false;
810 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
811 } else {
812 dwc->three_stage_setup = true;
813 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
814 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
815 }
816
817 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
818 ret = dwc3_ep0_std_request(dwc, ctrl);
819 else
820 ret = dwc3_ep0_delegate_req(dwc, ctrl);
821
822 if (ret == USB_GADGET_DELAYED_STATUS)
823 dwc->delayed_status = true;
824
825out:
826 if (ret < 0)
827 dwc3_ep0_stall_and_restart(dwc);
828}
829
830static void dwc3_ep0_complete_data(struct dwc3 *dwc,
831 const struct dwc3_event_depevt *event)
832{
833 struct dwc3_request *r = NULL;
834 struct usb_request *ur;
835 struct dwc3_trb *trb;
836 struct dwc3_ep *ep0;
837 unsigned transfer_size = 0;
838 unsigned maxp;
839 unsigned remaining_ur_length;
840 void *buf;
841 u32 transferred = 0;
842 u32 status;
843 u32 length;
844 u8 epnum;
845
846 epnum = event->endpoint_number;
847 ep0 = dwc->eps[0];
848
849 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
850
851 trb = dwc->ep0_trb;
852
853 trace_dwc3_complete_trb(ep0, trb);
854
855 r = next_request(&ep0->pending_list);
856 if (!r)
857 return;
858
859 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
860 if (status == DWC3_TRBSTS_SETUP_PENDING) {
861 dwc->setup_packet_pending = true;
862 if (r)
863 dwc3_gadget_giveback(ep0, r, -ECONNRESET);
864
865 return;
866 }
867
868 ur = &r->request;
869 buf = ur->buf;
870 remaining_ur_length = ur->length;
871
872 length = trb->size & DWC3_TRB_SIZE_MASK;
873
874 maxp = ep0->endpoint.maxpacket;
875
876 if (dwc->ep0_bounced) {
877 /*
878 * Handle the first TRB before handling the bounce buffer if
879 * the request length is greater than the bounce buffer size
880 */
881 if (ur->length > DWC3_EP0_BOUNCE_SIZE) {
882 transfer_size = ALIGN(ur->length - maxp, maxp);
883 transferred = transfer_size - length;
884 buf = (u8 *)buf + transferred;
885 ur->actual += transferred;
886 remaining_ur_length -= transferred;
887
888 trb++;
889 length = trb->size & DWC3_TRB_SIZE_MASK;
890
891 ep0->trb_enqueue = 0;
892 }
893
894 transfer_size = roundup((ur->length - transfer_size),
895 maxp);
896
897 transferred = min_t(u32, remaining_ur_length,
898 transfer_size - length);
899 memcpy(buf, dwc->ep0_bounce, transferred);
900 } else {
901 transferred = ur->length - length;
902 }
903
904 ur->actual += transferred;
905
906 if ((epnum & 1) && ur->actual < ur->length) {
907 /* for some reason we did not get everything out */
908
909 dwc3_ep0_stall_and_restart(dwc);
910 } else {
911 dwc3_gadget_giveback(ep0, r, 0);
912
913 if (IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) &&
914 ur->length && ur->zero) {
915 int ret;
916
917 dwc->ep0_next_event = DWC3_EP0_COMPLETE;
918
919 dwc3_ep0_prepare_one_trb(dwc, epnum, dwc->ctrl_req_addr,
920 0, DWC3_TRBCTL_CONTROL_DATA, false);
921 ret = dwc3_ep0_start_trans(dwc, epnum);
922 WARN_ON(ret < 0);
923 }
924 }
925}
926
927static void dwc3_ep0_complete_status(struct dwc3 *dwc,
928 const struct dwc3_event_depevt *event)
929{
930 struct dwc3_request *r;
931 struct dwc3_ep *dep;
932 struct dwc3_trb *trb;
933 u32 status;
934
935 dep = dwc->eps[0];
936 trb = dwc->ep0_trb;
937
938 trace_dwc3_complete_trb(dep, trb);
939
940 if (!list_empty(&dep->pending_list)) {
941 r = next_request(&dep->pending_list);
942
943 dwc3_gadget_giveback(dep, r, 0);
944 }
945
946 if (dwc->test_mode) {
947 int ret;
948
949 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
950 if (ret < 0) {
951 dev_err(dwc->dev, "invalid test #%d\n",
952 dwc->test_mode_nr);
953 dwc3_ep0_stall_and_restart(dwc);
954 return;
955 }
956 }
957
958 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
959 if (status == DWC3_TRBSTS_SETUP_PENDING)
960 dwc->setup_packet_pending = true;
961
962 dwc->ep0state = EP0_SETUP_PHASE;
963 dwc3_ep0_out_start(dwc);
964}
965
966static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
967 const struct dwc3_event_depevt *event)
968{
969 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
970
971 dep->flags &= ~DWC3_EP_BUSY;
972 dep->resource_index = 0;
973 dwc->setup_packet_pending = false;
974
975 switch (dwc->ep0state) {
976 case EP0_SETUP_PHASE:
977 dwc3_ep0_inspect_setup(dwc, event);
978 break;
979
980 case EP0_DATA_PHASE:
981 dwc3_ep0_complete_data(dwc, event);
982 break;
983
984 case EP0_STATUS_PHASE:
985 dwc3_ep0_complete_status(dwc, event);
986 break;
987 default:
988 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
989 }
990}
991
992static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
993 struct dwc3_ep *dep, struct dwc3_request *req)
994{
995 int ret;
996
997 req->direction = !!dep->number;
998
999 if (req->request.length == 0) {
1000 dwc3_ep0_prepare_one_trb(dwc, dep->number,
1001 dwc->ctrl_req_addr, 0,
1002 DWC3_TRBCTL_CONTROL_DATA, false);
1003 ret = dwc3_ep0_start_trans(dwc, dep->number);
1004 } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
1005 && (dep->number == 0)) {
1006 u32 transfer_size = 0;
1007 u32 maxpacket;
1008
1009 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1010 &req->request, dep->number);
1011 if (ret)
1012 return;
1013
1014 maxpacket = dep->endpoint.maxpacket;
1015
1016 if (req->request.length > DWC3_EP0_BOUNCE_SIZE) {
1017 transfer_size = ALIGN(req->request.length - maxpacket,
1018 maxpacket);
1019 dwc3_ep0_prepare_one_trb(dwc, dep->number,
1020 req->request.dma,
1021 transfer_size,
1022 DWC3_TRBCTL_CONTROL_DATA,
1023 true);
1024 }
1025
1026 transfer_size = roundup((req->request.length - transfer_size),
1027 maxpacket);
1028
1029 dwc->ep0_bounced = true;
1030
1031 dwc3_ep0_prepare_one_trb(dwc, dep->number,
1032 dwc->ep0_bounce_addr, transfer_size,
1033 DWC3_TRBCTL_CONTROL_DATA, false);
1034 ret = dwc3_ep0_start_trans(dwc, dep->number);
1035 } else {
1036 ret = usb_gadget_map_request_by_dev(dwc->sysdev,
1037 &req->request, dep->number);
1038 if (ret)
1039 return;
1040
1041 dwc3_ep0_prepare_one_trb(dwc, dep->number, req->request.dma,
1042 req->request.length, DWC3_TRBCTL_CONTROL_DATA,
1043 false);
1044 ret = dwc3_ep0_start_trans(dwc, dep->number);
1045 }
1046
1047 WARN_ON(ret < 0);
1048}
1049
1050static int dwc3_ep0_start_control_status(struct dwc3_ep *dep)
1051{
1052 struct dwc3 *dwc = dep->dwc;
1053 u32 type;
1054
1055 type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3
1056 : DWC3_TRBCTL_CONTROL_STATUS2;
1057
1058 dwc3_ep0_prepare_one_trb(dwc, dep->number,
1059 dwc->ctrl_req_addr, 0, type, false);
1060 return dwc3_ep0_start_trans(dwc, dep->number);
1061}
1062
1063static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
1064{
1065 WARN_ON(dwc3_ep0_start_control_status(dep));
1066}
1067
1068static void dwc3_ep0_do_control_status(struct dwc3 *dwc,
1069 const struct dwc3_event_depevt *event)
1070{
1071 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
1072
1073 __dwc3_ep0_do_control_status(dwc, dep);
1074}
1075
1076static void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep)
1077{
1078 struct dwc3_gadget_ep_cmd_params params;
1079 u32 cmd;
1080 int ret;
1081
1082 if (!dep->resource_index)
1083 return;
1084
1085 cmd = DWC3_DEPCMD_ENDTRANSFER;
1086 cmd |= DWC3_DEPCMD_CMDIOC;
1087 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
1088 memset(¶ms, 0, sizeof(params));
1089 ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
1090 WARN_ON_ONCE(ret);
1091 dep->resource_index = 0;
1092}
1093
1094static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
1095 const struct dwc3_event_depevt *event)
1096{
1097 switch (event->status) {
1098 case DEPEVT_STATUS_CONTROL_DATA:
1099 /*
1100 * We already have a DATA transfer in the controller's cache,
1101 * if we receive a XferNotReady(DATA) we will ignore it, unless
1102 * it's for the wrong direction.
1103 *
1104 * In that case, we must issue END_TRANSFER command to the Data
1105 * Phase we already have started and issue SetStall on the
1106 * control endpoint.
1107 */
1108 if (dwc->ep0_expect_in != event->endpoint_number) {
1109 struct dwc3_ep *dep = dwc->eps[dwc->ep0_expect_in];
1110
1111 dev_err(dwc->dev, "unexpected direction for Data Phase\n");
1112 dwc3_ep0_end_control_data(dwc, dep);
1113 dwc3_ep0_stall_and_restart(dwc);
1114 return;
1115 }
1116
1117 break;
1118
1119 case DEPEVT_STATUS_CONTROL_STATUS:
1120 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
1121 return;
1122
1123 dwc->ep0state = EP0_STATUS_PHASE;
1124
1125 if (dwc->delayed_status) {
1126 WARN_ON_ONCE(event->endpoint_number != 1);
1127 return;
1128 }
1129
1130 dwc3_ep0_do_control_status(dwc, event);
1131 }
1132}
1133
1134void dwc3_ep0_interrupt(struct dwc3 *dwc,
1135 const struct dwc3_event_depevt *event)
1136{
1137 switch (event->endpoint_event) {
1138 case DWC3_DEPEVT_XFERCOMPLETE:
1139 dwc3_ep0_xfer_complete(dwc, event);
1140 break;
1141
1142 case DWC3_DEPEVT_XFERNOTREADY:
1143 dwc3_ep0_xfernotready(dwc, event);
1144 break;
1145
1146 case DWC3_DEPEVT_XFERINPROGRESS:
1147 case DWC3_DEPEVT_RXTXFIFOEVT:
1148 case DWC3_DEPEVT_STREAMEVT:
1149 case DWC3_DEPEVT_EPCMDCMPLT:
1150 break;
1151 }
1152}