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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}
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}