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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * mtu3_gadget.c - MediaTek usb3 DRD peripheral support
4 *
5 * Copyright (C) 2016 MediaTek Inc.
6 *
7 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
8 */
9
10#include "mtu3.h"
11#include "mtu3_trace.h"
12
13void mtu3_req_complete(struct mtu3_ep *mep,
14 struct usb_request *req, int status)
15__releases(mep->mtu->lock)
16__acquires(mep->mtu->lock)
17{
18 struct mtu3_request *mreq = to_mtu3_request(req);
19 struct mtu3 *mtu = mreq->mtu;
20
21 list_del(&mreq->list);
22 if (req->status == -EINPROGRESS)
23 req->status = status;
24
25 trace_mtu3_req_complete(mreq);
26
27 /* ep0 makes use of PIO, needn't unmap it */
28 if (mep->epnum)
29 usb_gadget_unmap_request(&mtu->g, req, mep->is_in);
30
31 dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n",
32 mep->name, req, req->status, req->actual, req->length);
33
34 spin_unlock(&mtu->lock);
35 usb_gadget_giveback_request(&mep->ep, req);
36 spin_lock(&mtu->lock);
37}
38
39static void nuke(struct mtu3_ep *mep, const int status)
40{
41 struct mtu3_request *mreq = NULL;
42
43 if (list_empty(&mep->req_list))
44 return;
45
46 dev_dbg(mep->mtu->dev, "abort %s's req: sts %d\n", mep->name, status);
47
48 /* exclude EP0 */
49 if (mep->epnum)
50 mtu3_qmu_flush(mep);
51
52 while (!list_empty(&mep->req_list)) {
53 mreq = list_first_entry(&mep->req_list,
54 struct mtu3_request, list);
55 mtu3_req_complete(mep, &mreq->request, status);
56 }
57}
58
59static int mtu3_ep_enable(struct mtu3_ep *mep)
60{
61 const struct usb_endpoint_descriptor *desc;
62 const struct usb_ss_ep_comp_descriptor *comp_desc;
63 struct mtu3 *mtu = mep->mtu;
64 u32 interval = 0;
65 u32 mult = 0;
66 u32 burst = 0;
67 int ret;
68
69 desc = mep->desc;
70 comp_desc = mep->comp_desc;
71 mep->type = usb_endpoint_type(desc);
72 mep->maxp = usb_endpoint_maxp(desc);
73
74 switch (mtu->g.speed) {
75 case USB_SPEED_SUPER:
76 case USB_SPEED_SUPER_PLUS:
77 if (usb_endpoint_xfer_int(desc) ||
78 usb_endpoint_xfer_isoc(desc)) {
79 interval = desc->bInterval;
80 interval = clamp_val(interval, 1, 16);
81 if (usb_endpoint_xfer_isoc(desc) && comp_desc)
82 mult = comp_desc->bmAttributes;
83 }
84 if (comp_desc)
85 burst = comp_desc->bMaxBurst;
86
87 break;
88 case USB_SPEED_HIGH:
89 if (usb_endpoint_xfer_isoc(desc) ||
90 usb_endpoint_xfer_int(desc)) {
91 interval = desc->bInterval;
92 interval = clamp_val(interval, 1, 16);
93 mult = usb_endpoint_maxp_mult(desc) - 1;
94 }
95 break;
96 case USB_SPEED_FULL:
97 if (usb_endpoint_xfer_isoc(desc))
98 interval = clamp_val(desc->bInterval, 1, 16);
99 else if (usb_endpoint_xfer_int(desc))
100 interval = clamp_val(desc->bInterval, 1, 255);
101
102 break;
103 default:
104 break; /*others are ignored */
105 }
106
107 dev_dbg(mtu->dev, "%s maxp:%d, interval:%d, burst:%d, mult:%d\n",
108 __func__, mep->maxp, interval, burst, mult);
109
110 mep->ep.maxpacket = mep->maxp;
111 mep->ep.desc = desc;
112 mep->ep.comp_desc = comp_desc;
113
114 /* slot mainly affects bulk/isoc transfer, so ignore int */
115 mep->slot = usb_endpoint_xfer_int(desc) ? 0 : mtu->slot;
116
117 ret = mtu3_config_ep(mtu, mep, interval, burst, mult);
118 if (ret < 0)
119 return ret;
120
121 ret = mtu3_gpd_ring_alloc(mep);
122 if (ret < 0) {
123 mtu3_deconfig_ep(mtu, mep);
124 return ret;
125 }
126
127 mtu3_qmu_start(mep);
128
129 return 0;
130}
131
132static int mtu3_ep_disable(struct mtu3_ep *mep)
133{
134 struct mtu3 *mtu = mep->mtu;
135
136 /* abort all pending requests */
137 nuke(mep, -ESHUTDOWN);
138 mtu3_qmu_stop(mep);
139 mtu3_deconfig_ep(mtu, mep);
140 mtu3_gpd_ring_free(mep);
141
142 mep->desc = NULL;
143 mep->ep.desc = NULL;
144 mep->comp_desc = NULL;
145 mep->type = 0;
146 mep->flags = 0;
147
148 return 0;
149}
150
151static int mtu3_gadget_ep_enable(struct usb_ep *ep,
152 const struct usb_endpoint_descriptor *desc)
153{
154 struct mtu3_ep *mep;
155 struct mtu3 *mtu;
156 unsigned long flags;
157 int ret = -EINVAL;
158
159 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
160 pr_debug("%s invalid parameters\n", __func__);
161 return -EINVAL;
162 }
163
164 if (!desc->wMaxPacketSize) {
165 pr_debug("%s missing wMaxPacketSize\n", __func__);
166 return -EINVAL;
167 }
168 mep = to_mtu3_ep(ep);
169 mtu = mep->mtu;
170
171 /* check ep number and direction against endpoint */
172 if (usb_endpoint_num(desc) != mep->epnum)
173 return -EINVAL;
174
175 if (!!usb_endpoint_dir_in(desc) ^ !!mep->is_in)
176 return -EINVAL;
177
178 dev_dbg(mtu->dev, "%s %s\n", __func__, ep->name);
179
180 if (mep->flags & MTU3_EP_ENABLED) {
181 dev_WARN_ONCE(mtu->dev, true, "%s is already enabled\n",
182 mep->name);
183 return 0;
184 }
185
186 spin_lock_irqsave(&mtu->lock, flags);
187 mep->desc = desc;
188 mep->comp_desc = ep->comp_desc;
189
190 ret = mtu3_ep_enable(mep);
191 if (ret)
192 goto error;
193
194 mep->flags = MTU3_EP_ENABLED;
195 mtu->active_ep++;
196
197error:
198 spin_unlock_irqrestore(&mtu->lock, flags);
199
200 dev_dbg(mtu->dev, "%s active_ep=%d\n", __func__, mtu->active_ep);
201 trace_mtu3_gadget_ep_enable(mep);
202
203 return ret;
204}
205
206static int mtu3_gadget_ep_disable(struct usb_ep *ep)
207{
208 struct mtu3_ep *mep = to_mtu3_ep(ep);
209 struct mtu3 *mtu = mep->mtu;
210 unsigned long flags;
211
212 dev_dbg(mtu->dev, "%s %s\n", __func__, mep->name);
213 trace_mtu3_gadget_ep_disable(mep);
214
215 if (!(mep->flags & MTU3_EP_ENABLED)) {
216 dev_warn(mtu->dev, "%s is already disabled\n", mep->name);
217 return 0;
218 }
219
220 spin_lock_irqsave(&mtu->lock, flags);
221 mtu3_ep_disable(mep);
222 mep->flags = 0;
223 mtu->active_ep--;
224 spin_unlock_irqrestore(&(mtu->lock), flags);
225
226 dev_dbg(mtu->dev, "%s active_ep=%d, mtu3 is_active=%d\n",
227 __func__, mtu->active_ep, mtu->is_active);
228
229 return 0;
230}
231
232struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
233{
234 struct mtu3_ep *mep = to_mtu3_ep(ep);
235 struct mtu3_request *mreq;
236
237 mreq = kzalloc(sizeof(*mreq), gfp_flags);
238 if (!mreq)
239 return NULL;
240
241 mreq->request.dma = DMA_ADDR_INVALID;
242 mreq->epnum = mep->epnum;
243 mreq->mep = mep;
244 INIT_LIST_HEAD(&mreq->list);
245 trace_mtu3_alloc_request(mreq);
246
247 return &mreq->request;
248}
249
250void mtu3_free_request(struct usb_ep *ep, struct usb_request *req)
251{
252 struct mtu3_request *mreq = to_mtu3_request(req);
253
254 trace_mtu3_free_request(mreq);
255 kfree(mreq);
256}
257
258static int mtu3_gadget_queue(struct usb_ep *ep,
259 struct usb_request *req, gfp_t gfp_flags)
260{
261 struct mtu3_ep *mep = to_mtu3_ep(ep);
262 struct mtu3_request *mreq = to_mtu3_request(req);
263 struct mtu3 *mtu = mep->mtu;
264 unsigned long flags;
265 int ret = 0;
266
267 if (!req->buf)
268 return -ENODATA;
269
270 if (mreq->mep != mep)
271 return -EINVAL;
272
273 dev_dbg(mtu->dev, "%s %s EP%d(%s), req=%p, maxp=%d, len#%d\n",
274 __func__, mep->is_in ? "TX" : "RX", mreq->epnum, ep->name,
275 mreq, ep->maxpacket, mreq->request.length);
276
277 if (req->length > GPD_BUF_SIZE ||
278 (mtu->gen2cp && req->length > GPD_BUF_SIZE_EL)) {
279 dev_warn(mtu->dev,
280 "req length > supported MAX:%d requested:%d\n",
281 mtu->gen2cp ? GPD_BUF_SIZE_EL : GPD_BUF_SIZE,
282 req->length);
283 return -EOPNOTSUPP;
284 }
285
286 /* don't queue if the ep is down */
287 if (!mep->desc) {
288 dev_dbg(mtu->dev, "req=%p queued to %s while it's disabled\n",
289 req, ep->name);
290 return -ESHUTDOWN;
291 }
292
293 mreq->mtu = mtu;
294 mreq->request.actual = 0;
295 mreq->request.status = -EINPROGRESS;
296
297 ret = usb_gadget_map_request(&mtu->g, req, mep->is_in);
298 if (ret) {
299 dev_err(mtu->dev, "dma mapping failed\n");
300 return ret;
301 }
302
303 spin_lock_irqsave(&mtu->lock, flags);
304
305 if (mtu3_prepare_transfer(mep)) {
306 ret = -EAGAIN;
307 goto error;
308 }
309
310 list_add_tail(&mreq->list, &mep->req_list);
311 mtu3_insert_gpd(mep, mreq);
312 mtu3_qmu_resume(mep);
313
314error:
315 spin_unlock_irqrestore(&mtu->lock, flags);
316 trace_mtu3_gadget_queue(mreq);
317
318 return ret;
319}
320
321static int mtu3_gadget_dequeue(struct usb_ep *ep, struct usb_request *req)
322{
323 struct mtu3_ep *mep = to_mtu3_ep(ep);
324 struct mtu3_request *mreq = to_mtu3_request(req);
325 struct mtu3_request *r;
326 struct mtu3 *mtu = mep->mtu;
327 unsigned long flags;
328 int ret = 0;
329
330 if (mreq->mep != mep)
331 return -EINVAL;
332
333 dev_dbg(mtu->dev, "%s : req=%p\n", __func__, req);
334 trace_mtu3_gadget_dequeue(mreq);
335
336 spin_lock_irqsave(&mtu->lock, flags);
337
338 list_for_each_entry(r, &mep->req_list, list) {
339 if (r == mreq)
340 break;
341 }
342 if (r != mreq) {
343 dev_dbg(mtu->dev, "req=%p not queued to %s\n", req, ep->name);
344 ret = -EINVAL;
345 goto done;
346 }
347
348 mtu3_qmu_flush(mep); /* REVISIT: set BPS ?? */
349 mtu3_req_complete(mep, req, -ECONNRESET);
350 mtu3_qmu_start(mep);
351
352done:
353 spin_unlock_irqrestore(&mtu->lock, flags);
354
355 return ret;
356}
357
358/*
359 * Set or clear the halt bit of an EP.
360 * A halted EP won't TX/RX any data but will queue requests.
361 */
362static int mtu3_gadget_ep_set_halt(struct usb_ep *ep, int value)
363{
364 struct mtu3_ep *mep = to_mtu3_ep(ep);
365 struct mtu3 *mtu = mep->mtu;
366 struct mtu3_request *mreq;
367 unsigned long flags;
368 int ret = 0;
369
370 dev_dbg(mtu->dev, "%s : %s...", __func__, ep->name);
371
372 spin_lock_irqsave(&mtu->lock, flags);
373
374 if (mep->type == USB_ENDPOINT_XFER_ISOC) {
375 ret = -EINVAL;
376 goto done;
377 }
378
379 mreq = next_request(mep);
380 if (value) {
381 /*
382 * If there is not request for TX-EP, QMU will not transfer
383 * data to TX-FIFO, so no need check whether TX-FIFO
384 * holds bytes or not here
385 */
386 if (mreq) {
387 dev_dbg(mtu->dev, "req in progress, cannot halt %s\n",
388 ep->name);
389 ret = -EAGAIN;
390 goto done;
391 }
392 } else {
393 mep->flags &= ~MTU3_EP_WEDGE;
394 }
395
396 dev_dbg(mtu->dev, "%s %s stall\n", ep->name, value ? "set" : "clear");
397
398 mtu3_ep_stall_set(mep, value);
399
400done:
401 spin_unlock_irqrestore(&mtu->lock, flags);
402 trace_mtu3_gadget_ep_set_halt(mep);
403
404 return ret;
405}
406
407/* Sets the halt feature with the clear requests ignored */
408static int mtu3_gadget_ep_set_wedge(struct usb_ep *ep)
409{
410 struct mtu3_ep *mep = to_mtu3_ep(ep);
411
412 mep->flags |= MTU3_EP_WEDGE;
413
414 return usb_ep_set_halt(ep);
415}
416
417static const struct usb_ep_ops mtu3_ep_ops = {
418 .enable = mtu3_gadget_ep_enable,
419 .disable = mtu3_gadget_ep_disable,
420 .alloc_request = mtu3_alloc_request,
421 .free_request = mtu3_free_request,
422 .queue = mtu3_gadget_queue,
423 .dequeue = mtu3_gadget_dequeue,
424 .set_halt = mtu3_gadget_ep_set_halt,
425 .set_wedge = mtu3_gadget_ep_set_wedge,
426};
427
428static int mtu3_gadget_get_frame(struct usb_gadget *gadget)
429{
430 struct mtu3 *mtu = gadget_to_mtu3(gadget);
431
432 return (int)mtu3_readl(mtu->mac_base, U3D_USB20_FRAME_NUM);
433}
434
435static void function_wake_notif(struct mtu3 *mtu, u8 intf)
436{
437 mtu3_writel(mtu->mac_base, U3D_DEV_NOTIF_0,
438 TYPE_FUNCTION_WAKE | DEV_NOTIF_VAL_FW(intf));
439 mtu3_setbits(mtu->mac_base, U3D_DEV_NOTIF_0, SEND_DEV_NOTIF);
440}
441
442static int mtu3_gadget_wakeup(struct usb_gadget *gadget)
443{
444 struct mtu3 *mtu = gadget_to_mtu3(gadget);
445 unsigned long flags;
446
447 dev_dbg(mtu->dev, "%s\n", __func__);
448
449 /* remote wakeup feature is not enabled by host */
450 if (!mtu->may_wakeup)
451 return -EOPNOTSUPP;
452
453 spin_lock_irqsave(&mtu->lock, flags);
454 if (mtu->g.speed >= USB_SPEED_SUPER) {
455 /*
456 * class driver may do function wakeup even UFP is in U0,
457 * and UX_EXIT only takes effect in U1/U2/U3;
458 */
459 mtu3_setbits(mtu->mac_base, U3D_LINK_POWER_CONTROL, UX_EXIT);
460 /*
461 * Assume there's only one function on the composite device
462 * and enable remote wake for the first interface.
463 * FIXME if the IAD (interface association descriptor) shows
464 * there is more than one function.
465 */
466 function_wake_notif(mtu, 0);
467 } else {
468 mtu3_setbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
469 spin_unlock_irqrestore(&mtu->lock, flags);
470 usleep_range(10000, 11000);
471 spin_lock_irqsave(&mtu->lock, flags);
472 mtu3_clrbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
473 }
474 spin_unlock_irqrestore(&mtu->lock, flags);
475 return 0;
476}
477
478static int mtu3_gadget_set_self_powered(struct usb_gadget *gadget,
479 int is_selfpowered)
480{
481 struct mtu3 *mtu = gadget_to_mtu3(gadget);
482
483 mtu->is_self_powered = !!is_selfpowered;
484 return 0;
485}
486
487static int mtu3_gadget_pullup(struct usb_gadget *gadget, int is_on)
488{
489 struct mtu3 *mtu = gadget_to_mtu3(gadget);
490 unsigned long flags;
491
492 dev_dbg(mtu->dev, "%s (%s) for %sactive device\n", __func__,
493 is_on ? "on" : "off", mtu->is_active ? "" : "in");
494
495 pm_runtime_get_sync(mtu->dev);
496
497 /* we'd rather not pullup unless the device is active. */
498 spin_lock_irqsave(&mtu->lock, flags);
499
500 is_on = !!is_on;
501 if (!mtu->is_active) {
502 /* save it for mtu3_start() to process the request */
503 mtu->softconnect = is_on;
504 } else if (is_on != mtu->softconnect) {
505 mtu->softconnect = is_on;
506 mtu3_dev_on_off(mtu, is_on);
507 }
508
509 spin_unlock_irqrestore(&mtu->lock, flags);
510 pm_runtime_put(mtu->dev);
511
512 return 0;
513}
514
515static int mtu3_gadget_start(struct usb_gadget *gadget,
516 struct usb_gadget_driver *driver)
517{
518 struct mtu3 *mtu = gadget_to_mtu3(gadget);
519 unsigned long flags;
520
521 if (mtu->gadget_driver) {
522 dev_err(mtu->dev, "%s is already bound to %s\n",
523 mtu->g.name, mtu->gadget_driver->driver.name);
524 return -EBUSY;
525 }
526
527 dev_dbg(mtu->dev, "bind driver %s\n", driver->function);
528 pm_runtime_get_sync(mtu->dev);
529
530 spin_lock_irqsave(&mtu->lock, flags);
531
532 mtu->softconnect = 0;
533 mtu->gadget_driver = driver;
534
535 if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
536 mtu3_start(mtu);
537
538 spin_unlock_irqrestore(&mtu->lock, flags);
539 pm_runtime_put(mtu->dev);
540
541 return 0;
542}
543
544static void stop_activity(struct mtu3 *mtu)
545{
546 struct usb_gadget_driver *driver = mtu->gadget_driver;
547 int i;
548
549 /* don't disconnect if it's not connected */
550 if (mtu->g.speed == USB_SPEED_UNKNOWN)
551 driver = NULL;
552 else
553 mtu->g.speed = USB_SPEED_UNKNOWN;
554
555 /* deactivate the hardware */
556 if (mtu->softconnect) {
557 mtu->softconnect = 0;
558 mtu3_dev_on_off(mtu, 0);
559 }
560
561 /*
562 * killing any outstanding requests will quiesce the driver;
563 * then report disconnect
564 */
565 nuke(mtu->ep0, -ESHUTDOWN);
566 for (i = 1; i < mtu->num_eps; i++) {
567 nuke(mtu->in_eps + i, -ESHUTDOWN);
568 nuke(mtu->out_eps + i, -ESHUTDOWN);
569 }
570
571 if (driver) {
572 spin_unlock(&mtu->lock);
573 driver->disconnect(&mtu->g);
574 spin_lock(&mtu->lock);
575 }
576}
577
578static int mtu3_gadget_stop(struct usb_gadget *g)
579{
580 struct mtu3 *mtu = gadget_to_mtu3(g);
581 unsigned long flags;
582
583 dev_dbg(mtu->dev, "%s\n", __func__);
584
585 spin_lock_irqsave(&mtu->lock, flags);
586
587 stop_activity(mtu);
588 mtu->gadget_driver = NULL;
589
590 if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
591 mtu3_stop(mtu);
592
593 spin_unlock_irqrestore(&mtu->lock, flags);
594
595 synchronize_irq(mtu->irq);
596 return 0;
597}
598
599static void
600mtu3_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed)
601{
602 struct mtu3 *mtu = gadget_to_mtu3(g);
603 unsigned long flags;
604
605 dev_dbg(mtu->dev, "%s %s\n", __func__, usb_speed_string(speed));
606
607 spin_lock_irqsave(&mtu->lock, flags);
608 mtu->speed = speed;
609 spin_unlock_irqrestore(&mtu->lock, flags);
610}
611
612static void mtu3_gadget_async_callbacks(struct usb_gadget *g, bool enable)
613{
614 struct mtu3 *mtu = gadget_to_mtu3(g);
615 unsigned long flags;
616
617 dev_dbg(mtu->dev, "%s %s\n", __func__, enable ? "en" : "dis");
618
619 spin_lock_irqsave(&mtu->lock, flags);
620 mtu->async_callbacks = enable;
621 spin_unlock_irqrestore(&mtu->lock, flags);
622}
623
624static const struct usb_gadget_ops mtu3_gadget_ops = {
625 .get_frame = mtu3_gadget_get_frame,
626 .wakeup = mtu3_gadget_wakeup,
627 .set_selfpowered = mtu3_gadget_set_self_powered,
628 .pullup = mtu3_gadget_pullup,
629 .udc_start = mtu3_gadget_start,
630 .udc_stop = mtu3_gadget_stop,
631 .udc_set_speed = mtu3_gadget_set_speed,
632 .udc_async_callbacks = mtu3_gadget_async_callbacks,
633};
634
635static void mtu3_state_reset(struct mtu3 *mtu)
636{
637 mtu->address = 0;
638 mtu->ep0_state = MU3D_EP0_STATE_SETUP;
639 mtu->may_wakeup = 0;
640 mtu->u1_enable = 0;
641 mtu->u2_enable = 0;
642 mtu->delayed_status = false;
643 mtu->test_mode = false;
644}
645
646static void init_hw_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
647 u32 epnum, u32 is_in)
648{
649 mep->epnum = epnum;
650 mep->mtu = mtu;
651 mep->is_in = is_in;
652
653 INIT_LIST_HEAD(&mep->req_list);
654
655 sprintf(mep->name, "ep%d%s", epnum,
656 !epnum ? "" : (is_in ? "in" : "out"));
657
658 mep->ep.name = mep->name;
659 INIT_LIST_HEAD(&mep->ep.ep_list);
660
661 /* initialize maxpacket as SS */
662 if (!epnum) {
663 usb_ep_set_maxpacket_limit(&mep->ep, 512);
664 mep->ep.caps.type_control = true;
665 mep->ep.ops = &mtu3_ep0_ops;
666 mtu->g.ep0 = &mep->ep;
667 } else {
668 usb_ep_set_maxpacket_limit(&mep->ep, 1024);
669 mep->ep.caps.type_iso = true;
670 mep->ep.caps.type_bulk = true;
671 mep->ep.caps.type_int = true;
672 mep->ep.ops = &mtu3_ep_ops;
673 list_add_tail(&mep->ep.ep_list, &mtu->g.ep_list);
674 }
675
676 dev_dbg(mtu->dev, "%s, name=%s, maxp=%d\n", __func__, mep->ep.name,
677 mep->ep.maxpacket);
678
679 if (!epnum) {
680 mep->ep.caps.dir_in = true;
681 mep->ep.caps.dir_out = true;
682 } else if (is_in) {
683 mep->ep.caps.dir_in = true;
684 } else {
685 mep->ep.caps.dir_out = true;
686 }
687}
688
689static void mtu3_gadget_init_eps(struct mtu3 *mtu)
690{
691 u8 epnum;
692
693 /* initialize endpoint list just once */
694 INIT_LIST_HEAD(&(mtu->g.ep_list));
695
696 dev_dbg(mtu->dev, "%s num_eps(1 for a pair of tx&rx ep)=%d\n",
697 __func__, mtu->num_eps);
698
699 init_hw_ep(mtu, mtu->ep0, 0, 0);
700 for (epnum = 1; epnum < mtu->num_eps; epnum++) {
701 init_hw_ep(mtu, mtu->in_eps + epnum, epnum, 1);
702 init_hw_ep(mtu, mtu->out_eps + epnum, epnum, 0);
703 }
704}
705
706int mtu3_gadget_setup(struct mtu3 *mtu)
707{
708 mtu->g.ops = &mtu3_gadget_ops;
709 mtu->g.max_speed = mtu->max_speed;
710 mtu->g.speed = USB_SPEED_UNKNOWN;
711 mtu->g.sg_supported = 0;
712 mtu->g.name = MTU3_DRIVER_NAME;
713 mtu->g.irq = mtu->irq;
714 mtu->is_active = 0;
715 mtu->delayed_status = false;
716
717 mtu3_gadget_init_eps(mtu);
718
719 return usb_add_gadget_udc(mtu->dev, &mtu->g);
720}
721
722void mtu3_gadget_cleanup(struct mtu3 *mtu)
723{
724 usb_del_gadget_udc(&mtu->g);
725}
726
727void mtu3_gadget_resume(struct mtu3 *mtu)
728{
729 dev_dbg(mtu->dev, "gadget RESUME\n");
730 if (mtu->async_callbacks && mtu->gadget_driver && mtu->gadget_driver->resume) {
731 spin_unlock(&mtu->lock);
732 mtu->gadget_driver->resume(&mtu->g);
733 spin_lock(&mtu->lock);
734 }
735}
736
737/* called when SOF packets stop for 3+ msec or enters U3 */
738void mtu3_gadget_suspend(struct mtu3 *mtu)
739{
740 dev_dbg(mtu->dev, "gadget SUSPEND\n");
741 if (mtu->async_callbacks && mtu->gadget_driver && mtu->gadget_driver->suspend) {
742 spin_unlock(&mtu->lock);
743 mtu->gadget_driver->suspend(&mtu->g);
744 spin_lock(&mtu->lock);
745 }
746}
747
748/* called when VBUS drops below session threshold, and in other cases */
749void mtu3_gadget_disconnect(struct mtu3 *mtu)
750{
751 dev_dbg(mtu->dev, "gadget DISCONNECT\n");
752 if (mtu->async_callbacks && mtu->gadget_driver && mtu->gadget_driver->disconnect) {
753 spin_unlock(&mtu->lock);
754 mtu->gadget_driver->disconnect(&mtu->g);
755 spin_lock(&mtu->lock);
756 }
757
758 mtu3_state_reset(mtu);
759 usb_gadget_set_state(&mtu->g, USB_STATE_NOTATTACHED);
760}
761
762void mtu3_gadget_reset(struct mtu3 *mtu)
763{
764 dev_dbg(mtu->dev, "gadget RESET\n");
765
766 /* report disconnect, if we didn't flush EP state */
767 if (mtu->g.speed != USB_SPEED_UNKNOWN)
768 mtu3_gadget_disconnect(mtu);
769 else
770 mtu3_state_reset(mtu);
771}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * mtu3_gadget.c - MediaTek usb3 DRD peripheral support
4 *
5 * Copyright (C) 2016 MediaTek Inc.
6 *
7 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
8 */
9
10#include "mtu3.h"
11
12void mtu3_req_complete(struct mtu3_ep *mep,
13 struct usb_request *req, int status)
14__releases(mep->mtu->lock)
15__acquires(mep->mtu->lock)
16{
17 struct mtu3_request *mreq;
18 struct mtu3 *mtu;
19 int busy = mep->busy;
20
21 mreq = to_mtu3_request(req);
22 list_del(&mreq->list);
23 if (mreq->request.status == -EINPROGRESS)
24 mreq->request.status = status;
25
26 mtu = mreq->mtu;
27 mep->busy = 1;
28 spin_unlock(&mtu->lock);
29
30 /* ep0 makes use of PIO, needn't unmap it */
31 if (mep->epnum)
32 usb_gadget_unmap_request(&mtu->g, req, mep->is_in);
33
34 dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n", mep->name,
35 req, req->status, mreq->request.actual, mreq->request.length);
36
37 usb_gadget_giveback_request(&mep->ep, &mreq->request);
38
39 spin_lock(&mtu->lock);
40 mep->busy = busy;
41}
42
43static void nuke(struct mtu3_ep *mep, const int status)
44{
45 struct mtu3_request *mreq = NULL;
46
47 mep->busy = 1;
48 if (list_empty(&mep->req_list))
49 return;
50
51 dev_dbg(mep->mtu->dev, "abort %s's req: sts %d\n", mep->name, status);
52
53 /* exclude EP0 */
54 if (mep->epnum)
55 mtu3_qmu_flush(mep);
56
57 while (!list_empty(&mep->req_list)) {
58 mreq = list_first_entry(&mep->req_list,
59 struct mtu3_request, list);
60 mtu3_req_complete(mep, &mreq->request, status);
61 }
62}
63
64static int mtu3_ep_enable(struct mtu3_ep *mep)
65{
66 const struct usb_endpoint_descriptor *desc;
67 const struct usb_ss_ep_comp_descriptor *comp_desc;
68 struct mtu3 *mtu = mep->mtu;
69 u32 interval = 0;
70 u32 mult = 0;
71 u32 burst = 0;
72 int max_packet;
73 int ret;
74
75 desc = mep->desc;
76 comp_desc = mep->comp_desc;
77 mep->type = usb_endpoint_type(desc);
78 max_packet = usb_endpoint_maxp(desc);
79 mep->maxp = max_packet & GENMASK(10, 0);
80
81 switch (mtu->g.speed) {
82 case USB_SPEED_SUPER:
83 case USB_SPEED_SUPER_PLUS:
84 if (usb_endpoint_xfer_int(desc) ||
85 usb_endpoint_xfer_isoc(desc)) {
86 interval = desc->bInterval;
87 interval = clamp_val(interval, 1, 16) - 1;
88 if (usb_endpoint_xfer_isoc(desc) && comp_desc)
89 mult = comp_desc->bmAttributes;
90 }
91 if (comp_desc)
92 burst = comp_desc->bMaxBurst;
93
94 break;
95 case USB_SPEED_HIGH:
96 if (usb_endpoint_xfer_isoc(desc) ||
97 usb_endpoint_xfer_int(desc)) {
98 interval = desc->bInterval;
99 interval = clamp_val(interval, 1, 16) - 1;
100 burst = (max_packet & GENMASK(12, 11)) >> 11;
101 }
102 break;
103 default:
104 break; /*others are ignored */
105 }
106
107 dev_dbg(mtu->dev, "%s maxp:%d, interval:%d, burst:%d, mult:%d\n",
108 __func__, mep->maxp, interval, burst, mult);
109
110 mep->ep.maxpacket = mep->maxp;
111 mep->ep.desc = desc;
112 mep->ep.comp_desc = comp_desc;
113
114 /* slot mainly affects bulk/isoc transfer, so ignore int */
115 mep->slot = usb_endpoint_xfer_int(desc) ? 0 : mtu->slot;
116
117 ret = mtu3_config_ep(mtu, mep, interval, burst, mult);
118 if (ret < 0)
119 return ret;
120
121 ret = mtu3_gpd_ring_alloc(mep);
122 if (ret < 0) {
123 mtu3_deconfig_ep(mtu, mep);
124 return ret;
125 }
126
127 mtu3_qmu_start(mep);
128
129 return 0;
130}
131
132static int mtu3_ep_disable(struct mtu3_ep *mep)
133{
134 struct mtu3 *mtu = mep->mtu;
135
136 mtu3_qmu_stop(mep);
137
138 /* abort all pending requests */
139 nuke(mep, -ESHUTDOWN);
140 mtu3_deconfig_ep(mtu, mep);
141 mtu3_gpd_ring_free(mep);
142
143 mep->desc = NULL;
144 mep->ep.desc = NULL;
145 mep->comp_desc = NULL;
146 mep->type = 0;
147 mep->flags = 0;
148
149 return 0;
150}
151
152static int mtu3_gadget_ep_enable(struct usb_ep *ep,
153 const struct usb_endpoint_descriptor *desc)
154{
155 struct mtu3_ep *mep;
156 struct mtu3 *mtu;
157 unsigned long flags;
158 int ret = -EINVAL;
159
160 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
161 pr_debug("%s invalid parameters\n", __func__);
162 return -EINVAL;
163 }
164
165 if (!desc->wMaxPacketSize) {
166 pr_debug("%s missing wMaxPacketSize\n", __func__);
167 return -EINVAL;
168 }
169 mep = to_mtu3_ep(ep);
170 mtu = mep->mtu;
171
172 /* check ep number and direction against endpoint */
173 if (usb_endpoint_num(desc) != mep->epnum)
174 return -EINVAL;
175
176 if (!!usb_endpoint_dir_in(desc) ^ !!mep->is_in)
177 return -EINVAL;
178
179 dev_dbg(mtu->dev, "%s %s\n", __func__, ep->name);
180
181 if (mep->flags & MTU3_EP_ENABLED) {
182 dev_WARN_ONCE(mtu->dev, true, "%s is already enabled\n",
183 mep->name);
184 return 0;
185 }
186
187 spin_lock_irqsave(&mtu->lock, flags);
188 mep->desc = desc;
189 mep->comp_desc = ep->comp_desc;
190
191 ret = mtu3_ep_enable(mep);
192 if (ret)
193 goto error;
194
195 mep->busy = 0;
196 mep->wedged = 0;
197 mep->flags |= MTU3_EP_ENABLED;
198 mtu->active_ep++;
199
200error:
201 spin_unlock_irqrestore(&mtu->lock, flags);
202
203 dev_dbg(mtu->dev, "%s active_ep=%d\n", __func__, mtu->active_ep);
204
205 return ret;
206}
207
208static int mtu3_gadget_ep_disable(struct usb_ep *ep)
209{
210 struct mtu3_ep *mep = to_mtu3_ep(ep);
211 struct mtu3 *mtu = mep->mtu;
212 unsigned long flags;
213
214 dev_dbg(mtu->dev, "%s %s\n", __func__, mep->name);
215
216 if (!(mep->flags & MTU3_EP_ENABLED)) {
217 dev_warn(mtu->dev, "%s is already disabled\n", mep->name);
218 return 0;
219 }
220
221 spin_lock_irqsave(&mtu->lock, flags);
222 mtu3_ep_disable(mep);
223 mep->flags &= ~MTU3_EP_ENABLED;
224 mtu->active_ep--;
225 spin_unlock_irqrestore(&(mtu->lock), flags);
226
227 dev_dbg(mtu->dev, "%s active_ep=%d, mtu3 is_active=%d\n",
228 __func__, mtu->active_ep, mtu->is_active);
229
230 return 0;
231}
232
233struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
234{
235 struct mtu3_ep *mep = to_mtu3_ep(ep);
236 struct mtu3_request *mreq;
237
238 mreq = kzalloc(sizeof(*mreq), gfp_flags);
239 if (!mreq)
240 return NULL;
241
242 mreq->request.dma = DMA_ADDR_INVALID;
243 mreq->epnum = mep->epnum;
244 mreq->mep = mep;
245
246 return &mreq->request;
247}
248
249void mtu3_free_request(struct usb_ep *ep, struct usb_request *req)
250{
251 kfree(to_mtu3_request(req));
252}
253
254static int mtu3_gadget_queue(struct usb_ep *ep,
255 struct usb_request *req, gfp_t gfp_flags)
256{
257 struct mtu3_ep *mep;
258 struct mtu3_request *mreq;
259 struct mtu3 *mtu;
260 unsigned long flags;
261 int ret = 0;
262
263 if (!ep || !req)
264 return -EINVAL;
265
266 if (!req->buf)
267 return -ENODATA;
268
269 mep = to_mtu3_ep(ep);
270 mtu = mep->mtu;
271 mreq = to_mtu3_request(req);
272 mreq->mtu = mtu;
273
274 if (mreq->mep != mep)
275 return -EINVAL;
276
277 dev_dbg(mtu->dev, "%s %s EP%d(%s), req=%p, maxp=%d, len#%d\n",
278 __func__, mep->is_in ? "TX" : "RX", mreq->epnum, ep->name,
279 mreq, ep->maxpacket, mreq->request.length);
280
281 if (req->length > GPD_BUF_SIZE) {
282 dev_warn(mtu->dev,
283 "req length > supported MAX:%d requested:%d\n",
284 GPD_BUF_SIZE, req->length);
285 return -EOPNOTSUPP;
286 }
287
288 /* don't queue if the ep is down */
289 if (!mep->desc) {
290 dev_dbg(mtu->dev, "req=%p queued to %s while it's disabled\n",
291 req, ep->name);
292 return -ESHUTDOWN;
293 }
294
295 mreq->request.actual = 0;
296 mreq->request.status = -EINPROGRESS;
297
298 ret = usb_gadget_map_request(&mtu->g, req, mep->is_in);
299 if (ret) {
300 dev_err(mtu->dev, "dma mapping failed\n");
301 return ret;
302 }
303
304 spin_lock_irqsave(&mtu->lock, flags);
305
306 if (mtu3_prepare_transfer(mep)) {
307 ret = -EAGAIN;
308 goto error;
309 }
310
311 list_add_tail(&mreq->list, &mep->req_list);
312 mtu3_insert_gpd(mep, mreq);
313 mtu3_qmu_resume(mep);
314
315error:
316 spin_unlock_irqrestore(&mtu->lock, flags);
317
318 return ret;
319}
320
321static int mtu3_gadget_dequeue(struct usb_ep *ep, struct usb_request *req)
322{
323 struct mtu3_ep *mep = to_mtu3_ep(ep);
324 struct mtu3_request *mreq = to_mtu3_request(req);
325 struct mtu3_request *r;
326 unsigned long flags;
327 int ret = 0;
328 struct mtu3 *mtu = mep->mtu;
329
330 if (!ep || !req || mreq->mep != mep)
331 return -EINVAL;
332
333 dev_dbg(mtu->dev, "%s : req=%p\n", __func__, req);
334
335 spin_lock_irqsave(&mtu->lock, flags);
336
337 list_for_each_entry(r, &mep->req_list, list) {
338 if (r == mreq)
339 break;
340 }
341 if (r != mreq) {
342 dev_dbg(mtu->dev, "req=%p not queued to %s\n", req, ep->name);
343 ret = -EINVAL;
344 goto done;
345 }
346
347 mtu3_qmu_flush(mep); /* REVISIT: set BPS ?? */
348 mtu3_req_complete(mep, req, -ECONNRESET);
349 mtu3_qmu_start(mep);
350
351done:
352 spin_unlock_irqrestore(&mtu->lock, flags);
353
354 return ret;
355}
356
357/*
358 * Set or clear the halt bit of an EP.
359 * A halted EP won't TX/RX any data but will queue requests.
360 */
361static int mtu3_gadget_ep_set_halt(struct usb_ep *ep, int value)
362{
363 struct mtu3_ep *mep = to_mtu3_ep(ep);
364 struct mtu3 *mtu = mep->mtu;
365 struct mtu3_request *mreq;
366 unsigned long flags;
367 int ret = 0;
368
369 if (!ep)
370 return -EINVAL;
371
372 dev_dbg(mtu->dev, "%s : %s...", __func__, ep->name);
373
374 spin_lock_irqsave(&mtu->lock, flags);
375
376 if (mep->type == USB_ENDPOINT_XFER_ISOC) {
377 ret = -EINVAL;
378 goto done;
379 }
380
381 mreq = next_request(mep);
382 if (value) {
383 /*
384 * If there is not request for TX-EP, QMU will not transfer
385 * data to TX-FIFO, so no need check whether TX-FIFO
386 * holds bytes or not here
387 */
388 if (mreq) {
389 dev_dbg(mtu->dev, "req in progress, cannot halt %s\n",
390 ep->name);
391 ret = -EAGAIN;
392 goto done;
393 }
394 } else {
395 mep->wedged = 0;
396 }
397
398 dev_dbg(mtu->dev, "%s %s stall\n", ep->name, value ? "set" : "clear");
399
400 mtu3_ep_stall_set(mep, value);
401
402done:
403 spin_unlock_irqrestore(&mtu->lock, flags);
404
405 return ret;
406}
407
408/* Sets the halt feature with the clear requests ignored */
409static int mtu3_gadget_ep_set_wedge(struct usb_ep *ep)
410{
411 struct mtu3_ep *mep = to_mtu3_ep(ep);
412
413 if (!ep)
414 return -EINVAL;
415
416 mep->wedged = 1;
417
418 return usb_ep_set_halt(ep);
419}
420
421static const struct usb_ep_ops mtu3_ep_ops = {
422 .enable = mtu3_gadget_ep_enable,
423 .disable = mtu3_gadget_ep_disable,
424 .alloc_request = mtu3_alloc_request,
425 .free_request = mtu3_free_request,
426 .queue = mtu3_gadget_queue,
427 .dequeue = mtu3_gadget_dequeue,
428 .set_halt = mtu3_gadget_ep_set_halt,
429 .set_wedge = mtu3_gadget_ep_set_wedge,
430};
431
432static int mtu3_gadget_get_frame(struct usb_gadget *gadget)
433{
434 struct mtu3 *mtu = gadget_to_mtu3(gadget);
435
436 return (int)mtu3_readl(mtu->mac_base, U3D_USB20_FRAME_NUM);
437}
438
439static int mtu3_gadget_wakeup(struct usb_gadget *gadget)
440{
441 struct mtu3 *mtu = gadget_to_mtu3(gadget);
442 unsigned long flags;
443
444 dev_dbg(mtu->dev, "%s\n", __func__);
445
446 /* remote wakeup feature is not enabled by host */
447 if (!mtu->may_wakeup)
448 return -EOPNOTSUPP;
449
450 spin_lock_irqsave(&mtu->lock, flags);
451 if (mtu->g.speed >= USB_SPEED_SUPER) {
452 mtu3_setbits(mtu->mac_base, U3D_LINK_POWER_CONTROL, UX_EXIT);
453 } else {
454 mtu3_setbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
455 spin_unlock_irqrestore(&mtu->lock, flags);
456 usleep_range(10000, 11000);
457 spin_lock_irqsave(&mtu->lock, flags);
458 mtu3_clrbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
459 }
460 spin_unlock_irqrestore(&mtu->lock, flags);
461 return 0;
462}
463
464static int mtu3_gadget_set_self_powered(struct usb_gadget *gadget,
465 int is_selfpowered)
466{
467 struct mtu3 *mtu = gadget_to_mtu3(gadget);
468
469 mtu->is_self_powered = !!is_selfpowered;
470 return 0;
471}
472
473static int mtu3_gadget_pullup(struct usb_gadget *gadget, int is_on)
474{
475 struct mtu3 *mtu = gadget_to_mtu3(gadget);
476 unsigned long flags;
477
478 dev_dbg(mtu->dev, "%s (%s) for %sactive device\n", __func__,
479 is_on ? "on" : "off", mtu->is_active ? "" : "in");
480
481 /* we'd rather not pullup unless the device is active. */
482 spin_lock_irqsave(&mtu->lock, flags);
483
484 is_on = !!is_on;
485 if (!mtu->is_active) {
486 /* save it for mtu3_start() to process the request */
487 mtu->softconnect = is_on;
488 } else if (is_on != mtu->softconnect) {
489 mtu->softconnect = is_on;
490 mtu3_dev_on_off(mtu, is_on);
491 }
492
493 spin_unlock_irqrestore(&mtu->lock, flags);
494
495 return 0;
496}
497
498static int mtu3_gadget_start(struct usb_gadget *gadget,
499 struct usb_gadget_driver *driver)
500{
501 struct mtu3 *mtu = gadget_to_mtu3(gadget);
502 unsigned long flags;
503
504 if (mtu->gadget_driver) {
505 dev_err(mtu->dev, "%s is already bound to %s\n",
506 mtu->g.name, mtu->gadget_driver->driver.name);
507 return -EBUSY;
508 }
509
510 dev_dbg(mtu->dev, "bind driver %s\n", driver->function);
511
512 spin_lock_irqsave(&mtu->lock, flags);
513
514 mtu->softconnect = 0;
515 mtu->gadget_driver = driver;
516
517 if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
518 mtu3_start(mtu);
519
520 spin_unlock_irqrestore(&mtu->lock, flags);
521
522 return 0;
523}
524
525static void stop_activity(struct mtu3 *mtu)
526{
527 struct usb_gadget_driver *driver = mtu->gadget_driver;
528 int i;
529
530 /* don't disconnect if it's not connected */
531 if (mtu->g.speed == USB_SPEED_UNKNOWN)
532 driver = NULL;
533 else
534 mtu->g.speed = USB_SPEED_UNKNOWN;
535
536 /* deactivate the hardware */
537 if (mtu->softconnect) {
538 mtu->softconnect = 0;
539 mtu3_dev_on_off(mtu, 0);
540 }
541
542 /*
543 * killing any outstanding requests will quiesce the driver;
544 * then report disconnect
545 */
546 nuke(mtu->ep0, -ESHUTDOWN);
547 for (i = 1; i < mtu->num_eps; i++) {
548 nuke(mtu->in_eps + i, -ESHUTDOWN);
549 nuke(mtu->out_eps + i, -ESHUTDOWN);
550 }
551
552 if (driver) {
553 spin_unlock(&mtu->lock);
554 driver->disconnect(&mtu->g);
555 spin_lock(&mtu->lock);
556 }
557}
558
559static int mtu3_gadget_stop(struct usb_gadget *g)
560{
561 struct mtu3 *mtu = gadget_to_mtu3(g);
562 unsigned long flags;
563
564 dev_dbg(mtu->dev, "%s\n", __func__);
565
566 spin_lock_irqsave(&mtu->lock, flags);
567
568 stop_activity(mtu);
569 mtu->gadget_driver = NULL;
570
571 if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
572 mtu3_stop(mtu);
573
574 spin_unlock_irqrestore(&mtu->lock, flags);
575
576 return 0;
577}
578
579static const struct usb_gadget_ops mtu3_gadget_ops = {
580 .get_frame = mtu3_gadget_get_frame,
581 .wakeup = mtu3_gadget_wakeup,
582 .set_selfpowered = mtu3_gadget_set_self_powered,
583 .pullup = mtu3_gadget_pullup,
584 .udc_start = mtu3_gadget_start,
585 .udc_stop = mtu3_gadget_stop,
586};
587
588static void init_hw_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
589 u32 epnum, u32 is_in)
590{
591 mep->epnum = epnum;
592 mep->mtu = mtu;
593 mep->is_in = is_in;
594
595 INIT_LIST_HEAD(&mep->req_list);
596
597 sprintf(mep->name, "ep%d%s", epnum,
598 !epnum ? "" : (is_in ? "in" : "out"));
599
600 mep->ep.name = mep->name;
601 INIT_LIST_HEAD(&mep->ep.ep_list);
602
603 /* initialize maxpacket as SS */
604 if (!epnum) {
605 usb_ep_set_maxpacket_limit(&mep->ep, 512);
606 mep->ep.caps.type_control = true;
607 mep->ep.ops = &mtu3_ep0_ops;
608 mtu->g.ep0 = &mep->ep;
609 } else {
610 usb_ep_set_maxpacket_limit(&mep->ep, 1024);
611 mep->ep.caps.type_iso = true;
612 mep->ep.caps.type_bulk = true;
613 mep->ep.caps.type_int = true;
614 mep->ep.ops = &mtu3_ep_ops;
615 list_add_tail(&mep->ep.ep_list, &mtu->g.ep_list);
616 }
617
618 dev_dbg(mtu->dev, "%s, name=%s, maxp=%d\n", __func__, mep->ep.name,
619 mep->ep.maxpacket);
620
621 if (!epnum) {
622 mep->ep.caps.dir_in = true;
623 mep->ep.caps.dir_out = true;
624 } else if (is_in) {
625 mep->ep.caps.dir_in = true;
626 } else {
627 mep->ep.caps.dir_out = true;
628 }
629}
630
631static void mtu3_gadget_init_eps(struct mtu3 *mtu)
632{
633 u8 epnum;
634
635 /* initialize endpoint list just once */
636 INIT_LIST_HEAD(&(mtu->g.ep_list));
637
638 dev_dbg(mtu->dev, "%s num_eps(1 for a pair of tx&rx ep)=%d\n",
639 __func__, mtu->num_eps);
640
641 init_hw_ep(mtu, mtu->ep0, 0, 0);
642 for (epnum = 1; epnum < mtu->num_eps; epnum++) {
643 init_hw_ep(mtu, mtu->in_eps + epnum, epnum, 1);
644 init_hw_ep(mtu, mtu->out_eps + epnum, epnum, 0);
645 }
646}
647
648int mtu3_gadget_setup(struct mtu3 *mtu)
649{
650 int ret;
651
652 mtu->g.ops = &mtu3_gadget_ops;
653 mtu->g.max_speed = mtu->max_speed;
654 mtu->g.speed = USB_SPEED_UNKNOWN;
655 mtu->g.sg_supported = 0;
656 mtu->g.name = MTU3_DRIVER_NAME;
657 mtu->is_active = 0;
658 mtu->delayed_status = false;
659
660 mtu3_gadget_init_eps(mtu);
661
662 ret = usb_add_gadget_udc(mtu->dev, &mtu->g);
663 if (ret) {
664 dev_err(mtu->dev, "failed to register udc\n");
665 return ret;
666 }
667
668 usb_gadget_set_state(&mtu->g, USB_STATE_NOTATTACHED);
669
670 return 0;
671}
672
673void mtu3_gadget_cleanup(struct mtu3 *mtu)
674{
675 usb_del_gadget_udc(&mtu->g);
676}
677
678void mtu3_gadget_resume(struct mtu3 *mtu)
679{
680 dev_dbg(mtu->dev, "gadget RESUME\n");
681 if (mtu->gadget_driver && mtu->gadget_driver->resume) {
682 spin_unlock(&mtu->lock);
683 mtu->gadget_driver->resume(&mtu->g);
684 spin_lock(&mtu->lock);
685 }
686}
687
688/* called when SOF packets stop for 3+ msec or enters U3 */
689void mtu3_gadget_suspend(struct mtu3 *mtu)
690{
691 dev_dbg(mtu->dev, "gadget SUSPEND\n");
692 if (mtu->gadget_driver && mtu->gadget_driver->suspend) {
693 spin_unlock(&mtu->lock);
694 mtu->gadget_driver->suspend(&mtu->g);
695 spin_lock(&mtu->lock);
696 }
697}
698
699/* called when VBUS drops below session threshold, and in other cases */
700void mtu3_gadget_disconnect(struct mtu3 *mtu)
701{
702 dev_dbg(mtu->dev, "gadget DISCONNECT\n");
703 if (mtu->gadget_driver && mtu->gadget_driver->disconnect) {
704 spin_unlock(&mtu->lock);
705 mtu->gadget_driver->disconnect(&mtu->g);
706 spin_lock(&mtu->lock);
707 }
708
709 usb_gadget_set_state(&mtu->g, USB_STATE_NOTATTACHED);
710}
711
712void mtu3_gadget_reset(struct mtu3 *mtu)
713{
714 dev_dbg(mtu->dev, "gadget RESET\n");
715
716 /* report disconnect, if we didn't flush EP state */
717 if (mtu->g.speed != USB_SPEED_UNKNOWN)
718 mtu3_gadget_disconnect(mtu);
719
720 mtu->address = 0;
721 mtu->ep0_state = MU3D_EP0_STATE_SETUP;
722 mtu->may_wakeup = 0;
723 mtu->u1_enable = 0;
724 mtu->u2_enable = 0;
725 mtu->delayed_status = false;
726}