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
mtu3_req_complete(struct mtu3_ep * mep,struct usb_request * req,int status)13 void 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 spin_unlock(&mtu->lock);
27
28 /* ep0 makes use of PIO, needn't unmap it */
29 if (mep->epnum)
30 usb_gadget_unmap_request(&mtu->g, req, mep->is_in);
31
32 dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n",
33 mep->name, req, req->status, req->actual, req->length);
34
35 usb_gadget_giveback_request(&mep->ep, req);
36 spin_lock(&mtu->lock);
37 }
38
nuke(struct mtu3_ep * mep,const int status)39 static 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
mtu3_ep_enable(struct mtu3_ep * mep)59 static 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 max_packet;
68 int ret;
69
70 desc = mep->desc;
71 comp_desc = mep->comp_desc;
72 mep->type = usb_endpoint_type(desc);
73 max_packet = usb_endpoint_maxp(desc);
74 mep->maxp = max_packet & GENMASK(10, 0);
75
76 switch (mtu->g.speed) {
77 case USB_SPEED_SUPER:
78 case USB_SPEED_SUPER_PLUS:
79 if (usb_endpoint_xfer_int(desc) ||
80 usb_endpoint_xfer_isoc(desc)) {
81 interval = desc->bInterval;
82 interval = clamp_val(interval, 1, 16) - 1;
83 if (usb_endpoint_xfer_isoc(desc) && comp_desc)
84 mult = comp_desc->bmAttributes;
85 }
86 if (comp_desc)
87 burst = comp_desc->bMaxBurst;
88
89 break;
90 case USB_SPEED_HIGH:
91 if (usb_endpoint_xfer_isoc(desc) ||
92 usb_endpoint_xfer_int(desc)) {
93 interval = desc->bInterval;
94 interval = clamp_val(interval, 1, 16) - 1;
95 burst = (max_packet & GENMASK(12, 11)) >> 11;
96 }
97 break;
98 default:
99 break; /*others are ignored */
100 }
101
102 dev_dbg(mtu->dev, "%s maxp:%d, interval:%d, burst:%d, mult:%d\n",
103 __func__, mep->maxp, interval, burst, mult);
104
105 mep->ep.maxpacket = mep->maxp;
106 mep->ep.desc = desc;
107 mep->ep.comp_desc = comp_desc;
108
109 /* slot mainly affects bulk/isoc transfer, so ignore int */
110 mep->slot = usb_endpoint_xfer_int(desc) ? 0 : mtu->slot;
111
112 ret = mtu3_config_ep(mtu, mep, interval, burst, mult);
113 if (ret < 0)
114 return ret;
115
116 ret = mtu3_gpd_ring_alloc(mep);
117 if (ret < 0) {
118 mtu3_deconfig_ep(mtu, mep);
119 return ret;
120 }
121
122 mtu3_qmu_start(mep);
123
124 return 0;
125 }
126
mtu3_ep_disable(struct mtu3_ep * mep)127 static int mtu3_ep_disable(struct mtu3_ep *mep)
128 {
129 struct mtu3 *mtu = mep->mtu;
130
131 mtu3_qmu_stop(mep);
132
133 /* abort all pending requests */
134 nuke(mep, -ESHUTDOWN);
135 mtu3_deconfig_ep(mtu, mep);
136 mtu3_gpd_ring_free(mep);
137
138 mep->desc = NULL;
139 mep->ep.desc = NULL;
140 mep->comp_desc = NULL;
141 mep->type = 0;
142 mep->flags = 0;
143
144 return 0;
145 }
146
mtu3_gadget_ep_enable(struct usb_ep * ep,const struct usb_endpoint_descriptor * desc)147 static int mtu3_gadget_ep_enable(struct usb_ep *ep,
148 const struct usb_endpoint_descriptor *desc)
149 {
150 struct mtu3_ep *mep;
151 struct mtu3 *mtu;
152 unsigned long flags;
153 int ret = -EINVAL;
154
155 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
156 pr_debug("%s invalid parameters\n", __func__);
157 return -EINVAL;
158 }
159
160 if (!desc->wMaxPacketSize) {
161 pr_debug("%s missing wMaxPacketSize\n", __func__);
162 return -EINVAL;
163 }
164 mep = to_mtu3_ep(ep);
165 mtu = mep->mtu;
166
167 /* check ep number and direction against endpoint */
168 if (usb_endpoint_num(desc) != mep->epnum)
169 return -EINVAL;
170
171 if (!!usb_endpoint_dir_in(desc) ^ !!mep->is_in)
172 return -EINVAL;
173
174 dev_dbg(mtu->dev, "%s %s\n", __func__, ep->name);
175
176 if (mep->flags & MTU3_EP_ENABLED) {
177 dev_WARN_ONCE(mtu->dev, true, "%s is already enabled\n",
178 mep->name);
179 return 0;
180 }
181
182 spin_lock_irqsave(&mtu->lock, flags);
183 mep->desc = desc;
184 mep->comp_desc = ep->comp_desc;
185
186 ret = mtu3_ep_enable(mep);
187 if (ret)
188 goto error;
189
190 mep->flags = MTU3_EP_ENABLED;
191 mtu->active_ep++;
192
193 error:
194 spin_unlock_irqrestore(&mtu->lock, flags);
195
196 dev_dbg(mtu->dev, "%s active_ep=%d\n", __func__, mtu->active_ep);
197 trace_mtu3_gadget_ep_enable(mep);
198
199 return ret;
200 }
201
mtu3_gadget_ep_disable(struct usb_ep * ep)202 static int mtu3_gadget_ep_disable(struct usb_ep *ep)
203 {
204 struct mtu3_ep *mep = to_mtu3_ep(ep);
205 struct mtu3 *mtu = mep->mtu;
206 unsigned long flags;
207
208 dev_dbg(mtu->dev, "%s %s\n", __func__, mep->name);
209 trace_mtu3_gadget_ep_disable(mep);
210
211 if (!(mep->flags & MTU3_EP_ENABLED)) {
212 dev_warn(mtu->dev, "%s is already disabled\n", mep->name);
213 return 0;
214 }
215
216 spin_lock_irqsave(&mtu->lock, flags);
217 mtu3_ep_disable(mep);
218 mep->flags = 0;
219 mtu->active_ep--;
220 spin_unlock_irqrestore(&(mtu->lock), flags);
221
222 dev_dbg(mtu->dev, "%s active_ep=%d, mtu3 is_active=%d\n",
223 __func__, mtu->active_ep, mtu->is_active);
224
225 return 0;
226 }
227
mtu3_alloc_request(struct usb_ep * ep,gfp_t gfp_flags)228 struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
229 {
230 struct mtu3_ep *mep = to_mtu3_ep(ep);
231 struct mtu3_request *mreq;
232
233 mreq = kzalloc(sizeof(*mreq), gfp_flags);
234 if (!mreq)
235 return NULL;
236
237 mreq->request.dma = DMA_ADDR_INVALID;
238 mreq->epnum = mep->epnum;
239 mreq->mep = mep;
240 trace_mtu3_alloc_request(mreq);
241
242 return &mreq->request;
243 }
244
mtu3_free_request(struct usb_ep * ep,struct usb_request * req)245 void mtu3_free_request(struct usb_ep *ep, struct usb_request *req)
246 {
247 struct mtu3_request *mreq = to_mtu3_request(req);
248
249 trace_mtu3_free_request(mreq);
250 kfree(mreq);
251 }
252
mtu3_gadget_queue(struct usb_ep * ep,struct usb_request * req,gfp_t gfp_flags)253 static int mtu3_gadget_queue(struct usb_ep *ep,
254 struct usb_request *req, gfp_t gfp_flags)
255 {
256 struct mtu3_ep *mep = to_mtu3_ep(ep);
257 struct mtu3_request *mreq = to_mtu3_request(req);
258 struct mtu3 *mtu = mep->mtu;
259 unsigned long flags;
260 int ret = 0;
261
262 if (!req->buf)
263 return -ENODATA;
264
265 if (mreq->mep != mep)
266 return -EINVAL;
267
268 dev_dbg(mtu->dev, "%s %s EP%d(%s), req=%p, maxp=%d, len#%d\n",
269 __func__, mep->is_in ? "TX" : "RX", mreq->epnum, ep->name,
270 mreq, ep->maxpacket, mreq->request.length);
271
272 if (req->length > GPD_BUF_SIZE ||
273 (mtu->gen2cp && req->length > GPD_BUF_SIZE_EL)) {
274 dev_warn(mtu->dev,
275 "req length > supported MAX:%d requested:%d\n",
276 mtu->gen2cp ? GPD_BUF_SIZE_EL : GPD_BUF_SIZE,
277 req->length);
278 return -EOPNOTSUPP;
279 }
280
281 /* don't queue if the ep is down */
282 if (!mep->desc) {
283 dev_dbg(mtu->dev, "req=%p queued to %s while it's disabled\n",
284 req, ep->name);
285 return -ESHUTDOWN;
286 }
287
288 mreq->mtu = mtu;
289 mreq->request.actual = 0;
290 mreq->request.status = -EINPROGRESS;
291
292 ret = usb_gadget_map_request(&mtu->g, req, mep->is_in);
293 if (ret) {
294 dev_err(mtu->dev, "dma mapping failed\n");
295 return ret;
296 }
297
298 spin_lock_irqsave(&mtu->lock, flags);
299
300 if (mtu3_prepare_transfer(mep)) {
301 ret = -EAGAIN;
302 goto error;
303 }
304
305 list_add_tail(&mreq->list, &mep->req_list);
306 mtu3_insert_gpd(mep, mreq);
307 mtu3_qmu_resume(mep);
308
309 error:
310 spin_unlock_irqrestore(&mtu->lock, flags);
311 trace_mtu3_gadget_queue(mreq);
312
313 return ret;
314 }
315
mtu3_gadget_dequeue(struct usb_ep * ep,struct usb_request * req)316 static int mtu3_gadget_dequeue(struct usb_ep *ep, struct usb_request *req)
317 {
318 struct mtu3_ep *mep = to_mtu3_ep(ep);
319 struct mtu3_request *mreq = to_mtu3_request(req);
320 struct mtu3_request *r;
321 struct mtu3 *mtu = mep->mtu;
322 unsigned long flags;
323 int ret = 0;
324
325 if (mreq->mep != mep)
326 return -EINVAL;
327
328 dev_dbg(mtu->dev, "%s : req=%p\n", __func__, req);
329 trace_mtu3_gadget_dequeue(mreq);
330
331 spin_lock_irqsave(&mtu->lock, flags);
332
333 list_for_each_entry(r, &mep->req_list, list) {
334 if (r == mreq)
335 break;
336 }
337 if (r != mreq) {
338 dev_dbg(mtu->dev, "req=%p not queued to %s\n", req, ep->name);
339 ret = -EINVAL;
340 goto done;
341 }
342
343 mtu3_qmu_flush(mep); /* REVISIT: set BPS ?? */
344 mtu3_req_complete(mep, req, -ECONNRESET);
345 mtu3_qmu_start(mep);
346
347 done:
348 spin_unlock_irqrestore(&mtu->lock, flags);
349
350 return ret;
351 }
352
353 /*
354 * Set or clear the halt bit of an EP.
355 * A halted EP won't TX/RX any data but will queue requests.
356 */
mtu3_gadget_ep_set_halt(struct usb_ep * ep,int value)357 static int mtu3_gadget_ep_set_halt(struct usb_ep *ep, int value)
358 {
359 struct mtu3_ep *mep = to_mtu3_ep(ep);
360 struct mtu3 *mtu = mep->mtu;
361 struct mtu3_request *mreq;
362 unsigned long flags;
363 int ret = 0;
364
365 dev_dbg(mtu->dev, "%s : %s...", __func__, ep->name);
366
367 spin_lock_irqsave(&mtu->lock, flags);
368
369 if (mep->type == USB_ENDPOINT_XFER_ISOC) {
370 ret = -EINVAL;
371 goto done;
372 }
373
374 mreq = next_request(mep);
375 if (value) {
376 /*
377 * If there is not request for TX-EP, QMU will not transfer
378 * data to TX-FIFO, so no need check whether TX-FIFO
379 * holds bytes or not here
380 */
381 if (mreq) {
382 dev_dbg(mtu->dev, "req in progress, cannot halt %s\n",
383 ep->name);
384 ret = -EAGAIN;
385 goto done;
386 }
387 } else {
388 mep->flags &= ~MTU3_EP_WEDGE;
389 }
390
391 dev_dbg(mtu->dev, "%s %s stall\n", ep->name, value ? "set" : "clear");
392
393 mtu3_ep_stall_set(mep, value);
394
395 done:
396 spin_unlock_irqrestore(&mtu->lock, flags);
397 trace_mtu3_gadget_ep_set_halt(mep);
398
399 return ret;
400 }
401
402 /* Sets the halt feature with the clear requests ignored */
mtu3_gadget_ep_set_wedge(struct usb_ep * ep)403 static int mtu3_gadget_ep_set_wedge(struct usb_ep *ep)
404 {
405 struct mtu3_ep *mep = to_mtu3_ep(ep);
406
407 mep->flags |= MTU3_EP_WEDGE;
408
409 return usb_ep_set_halt(ep);
410 }
411
412 static const struct usb_ep_ops mtu3_ep_ops = {
413 .enable = mtu3_gadget_ep_enable,
414 .disable = mtu3_gadget_ep_disable,
415 .alloc_request = mtu3_alloc_request,
416 .free_request = mtu3_free_request,
417 .queue = mtu3_gadget_queue,
418 .dequeue = mtu3_gadget_dequeue,
419 .set_halt = mtu3_gadget_ep_set_halt,
420 .set_wedge = mtu3_gadget_ep_set_wedge,
421 };
422
mtu3_gadget_get_frame(struct usb_gadget * gadget)423 static int mtu3_gadget_get_frame(struct usb_gadget *gadget)
424 {
425 struct mtu3 *mtu = gadget_to_mtu3(gadget);
426
427 return (int)mtu3_readl(mtu->mac_base, U3D_USB20_FRAME_NUM);
428 }
429
mtu3_gadget_wakeup(struct usb_gadget * gadget)430 static int mtu3_gadget_wakeup(struct usb_gadget *gadget)
431 {
432 struct mtu3 *mtu = gadget_to_mtu3(gadget);
433 unsigned long flags;
434
435 dev_dbg(mtu->dev, "%s\n", __func__);
436
437 /* remote wakeup feature is not enabled by host */
438 if (!mtu->may_wakeup)
439 return -EOPNOTSUPP;
440
441 spin_lock_irqsave(&mtu->lock, flags);
442 if (mtu->g.speed >= USB_SPEED_SUPER) {
443 mtu3_setbits(mtu->mac_base, U3D_LINK_POWER_CONTROL, UX_EXIT);
444 } else {
445 mtu3_setbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
446 spin_unlock_irqrestore(&mtu->lock, flags);
447 usleep_range(10000, 11000);
448 spin_lock_irqsave(&mtu->lock, flags);
449 mtu3_clrbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
450 }
451 spin_unlock_irqrestore(&mtu->lock, flags);
452 return 0;
453 }
454
mtu3_gadget_set_self_powered(struct usb_gadget * gadget,int is_selfpowered)455 static int mtu3_gadget_set_self_powered(struct usb_gadget *gadget,
456 int is_selfpowered)
457 {
458 struct mtu3 *mtu = gadget_to_mtu3(gadget);
459
460 mtu->is_self_powered = !!is_selfpowered;
461 return 0;
462 }
463
mtu3_gadget_pullup(struct usb_gadget * gadget,int is_on)464 static int mtu3_gadget_pullup(struct usb_gadget *gadget, int is_on)
465 {
466 struct mtu3 *mtu = gadget_to_mtu3(gadget);
467 unsigned long flags;
468
469 dev_dbg(mtu->dev, "%s (%s) for %sactive device\n", __func__,
470 is_on ? "on" : "off", mtu->is_active ? "" : "in");
471
472 /* we'd rather not pullup unless the device is active. */
473 spin_lock_irqsave(&mtu->lock, flags);
474
475 is_on = !!is_on;
476 if (!mtu->is_active) {
477 /* save it for mtu3_start() to process the request */
478 mtu->softconnect = is_on;
479 } else if (is_on != mtu->softconnect) {
480 mtu->softconnect = is_on;
481 mtu3_dev_on_off(mtu, is_on);
482 }
483
484 spin_unlock_irqrestore(&mtu->lock, flags);
485
486 return 0;
487 }
488
mtu3_gadget_start(struct usb_gadget * gadget,struct usb_gadget_driver * driver)489 static int mtu3_gadget_start(struct usb_gadget *gadget,
490 struct usb_gadget_driver *driver)
491 {
492 struct mtu3 *mtu = gadget_to_mtu3(gadget);
493 unsigned long flags;
494
495 if (mtu->gadget_driver) {
496 dev_err(mtu->dev, "%s is already bound to %s\n",
497 mtu->g.name, mtu->gadget_driver->driver.name);
498 return -EBUSY;
499 }
500
501 dev_dbg(mtu->dev, "bind driver %s\n", driver->function);
502
503 spin_lock_irqsave(&mtu->lock, flags);
504
505 mtu->softconnect = 0;
506 mtu->gadget_driver = driver;
507
508 if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
509 mtu3_start(mtu);
510
511 spin_unlock_irqrestore(&mtu->lock, flags);
512
513 return 0;
514 }
515
stop_activity(struct mtu3 * mtu)516 static void stop_activity(struct mtu3 *mtu)
517 {
518 struct usb_gadget_driver *driver = mtu->gadget_driver;
519 int i;
520
521 /* don't disconnect if it's not connected */
522 if (mtu->g.speed == USB_SPEED_UNKNOWN)
523 driver = NULL;
524 else
525 mtu->g.speed = USB_SPEED_UNKNOWN;
526
527 /* deactivate the hardware */
528 if (mtu->softconnect) {
529 mtu->softconnect = 0;
530 mtu3_dev_on_off(mtu, 0);
531 }
532
533 /*
534 * killing any outstanding requests will quiesce the driver;
535 * then report disconnect
536 */
537 nuke(mtu->ep0, -ESHUTDOWN);
538 for (i = 1; i < mtu->num_eps; i++) {
539 nuke(mtu->in_eps + i, -ESHUTDOWN);
540 nuke(mtu->out_eps + i, -ESHUTDOWN);
541 }
542
543 if (driver) {
544 spin_unlock(&mtu->lock);
545 driver->disconnect(&mtu->g);
546 spin_lock(&mtu->lock);
547 }
548 }
549
mtu3_gadget_stop(struct usb_gadget * g)550 static int mtu3_gadget_stop(struct usb_gadget *g)
551 {
552 struct mtu3 *mtu = gadget_to_mtu3(g);
553 unsigned long flags;
554
555 dev_dbg(mtu->dev, "%s\n", __func__);
556
557 spin_lock_irqsave(&mtu->lock, flags);
558
559 stop_activity(mtu);
560 mtu->gadget_driver = NULL;
561
562 if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
563 mtu3_stop(mtu);
564
565 spin_unlock_irqrestore(&mtu->lock, flags);
566
567 synchronize_irq(mtu->irq);
568 return 0;
569 }
570
571 static void
mtu3_gadget_set_speed(struct usb_gadget * g,enum usb_device_speed speed)572 mtu3_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed)
573 {
574 struct mtu3 *mtu = gadget_to_mtu3(g);
575 unsigned long flags;
576
577 dev_dbg(mtu->dev, "%s %s\n", __func__, usb_speed_string(speed));
578
579 spin_lock_irqsave(&mtu->lock, flags);
580 mtu3_set_speed(mtu, speed);
581 spin_unlock_irqrestore(&mtu->lock, flags);
582 }
583
584 static const struct usb_gadget_ops mtu3_gadget_ops = {
585 .get_frame = mtu3_gadget_get_frame,
586 .wakeup = mtu3_gadget_wakeup,
587 .set_selfpowered = mtu3_gadget_set_self_powered,
588 .pullup = mtu3_gadget_pullup,
589 .udc_start = mtu3_gadget_start,
590 .udc_stop = mtu3_gadget_stop,
591 .udc_set_speed = mtu3_gadget_set_speed,
592 };
593
mtu3_state_reset(struct mtu3 * mtu)594 static void mtu3_state_reset(struct mtu3 *mtu)
595 {
596 mtu->address = 0;
597 mtu->ep0_state = MU3D_EP0_STATE_SETUP;
598 mtu->may_wakeup = 0;
599 mtu->u1_enable = 0;
600 mtu->u2_enable = 0;
601 mtu->delayed_status = false;
602 mtu->test_mode = false;
603 }
604
init_hw_ep(struct mtu3 * mtu,struct mtu3_ep * mep,u32 epnum,u32 is_in)605 static void init_hw_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
606 u32 epnum, u32 is_in)
607 {
608 mep->epnum = epnum;
609 mep->mtu = mtu;
610 mep->is_in = is_in;
611
612 INIT_LIST_HEAD(&mep->req_list);
613
614 sprintf(mep->name, "ep%d%s", epnum,
615 !epnum ? "" : (is_in ? "in" : "out"));
616
617 mep->ep.name = mep->name;
618 INIT_LIST_HEAD(&mep->ep.ep_list);
619
620 /* initialize maxpacket as SS */
621 if (!epnum) {
622 usb_ep_set_maxpacket_limit(&mep->ep, 512);
623 mep->ep.caps.type_control = true;
624 mep->ep.ops = &mtu3_ep0_ops;
625 mtu->g.ep0 = &mep->ep;
626 } else {
627 usb_ep_set_maxpacket_limit(&mep->ep, 1024);
628 mep->ep.caps.type_iso = true;
629 mep->ep.caps.type_bulk = true;
630 mep->ep.caps.type_int = true;
631 mep->ep.ops = &mtu3_ep_ops;
632 list_add_tail(&mep->ep.ep_list, &mtu->g.ep_list);
633 }
634
635 dev_dbg(mtu->dev, "%s, name=%s, maxp=%d\n", __func__, mep->ep.name,
636 mep->ep.maxpacket);
637
638 if (!epnum) {
639 mep->ep.caps.dir_in = true;
640 mep->ep.caps.dir_out = true;
641 } else if (is_in) {
642 mep->ep.caps.dir_in = true;
643 } else {
644 mep->ep.caps.dir_out = true;
645 }
646 }
647
mtu3_gadget_init_eps(struct mtu3 * mtu)648 static void mtu3_gadget_init_eps(struct mtu3 *mtu)
649 {
650 u8 epnum;
651
652 /* initialize endpoint list just once */
653 INIT_LIST_HEAD(&(mtu->g.ep_list));
654
655 dev_dbg(mtu->dev, "%s num_eps(1 for a pair of tx&rx ep)=%d\n",
656 __func__, mtu->num_eps);
657
658 init_hw_ep(mtu, mtu->ep0, 0, 0);
659 for (epnum = 1; epnum < mtu->num_eps; epnum++) {
660 init_hw_ep(mtu, mtu->in_eps + epnum, epnum, 1);
661 init_hw_ep(mtu, mtu->out_eps + epnum, epnum, 0);
662 }
663 }
664
mtu3_gadget_setup(struct mtu3 * mtu)665 int mtu3_gadget_setup(struct mtu3 *mtu)
666 {
667 mtu->g.ops = &mtu3_gadget_ops;
668 mtu->g.max_speed = mtu->max_speed;
669 mtu->g.speed = USB_SPEED_UNKNOWN;
670 mtu->g.sg_supported = 0;
671 mtu->g.name = MTU3_DRIVER_NAME;
672 mtu->is_active = 0;
673 mtu->delayed_status = false;
674
675 mtu3_gadget_init_eps(mtu);
676
677 return usb_add_gadget_udc(mtu->dev, &mtu->g);
678 }
679
mtu3_gadget_cleanup(struct mtu3 * mtu)680 void mtu3_gadget_cleanup(struct mtu3 *mtu)
681 {
682 usb_del_gadget_udc(&mtu->g);
683 }
684
mtu3_gadget_resume(struct mtu3 * mtu)685 void mtu3_gadget_resume(struct mtu3 *mtu)
686 {
687 dev_dbg(mtu->dev, "gadget RESUME\n");
688 if (mtu->gadget_driver && mtu->gadget_driver->resume) {
689 spin_unlock(&mtu->lock);
690 mtu->gadget_driver->resume(&mtu->g);
691 spin_lock(&mtu->lock);
692 }
693 }
694
695 /* called when SOF packets stop for 3+ msec or enters U3 */
mtu3_gadget_suspend(struct mtu3 * mtu)696 void mtu3_gadget_suspend(struct mtu3 *mtu)
697 {
698 dev_dbg(mtu->dev, "gadget SUSPEND\n");
699 if (mtu->gadget_driver && mtu->gadget_driver->suspend) {
700 spin_unlock(&mtu->lock);
701 mtu->gadget_driver->suspend(&mtu->g);
702 spin_lock(&mtu->lock);
703 }
704 }
705
706 /* called when VBUS drops below session threshold, and in other cases */
mtu3_gadget_disconnect(struct mtu3 * mtu)707 void mtu3_gadget_disconnect(struct mtu3 *mtu)
708 {
709 dev_dbg(mtu->dev, "gadget DISCONNECT\n");
710 if (mtu->gadget_driver && mtu->gadget_driver->disconnect) {
711 spin_unlock(&mtu->lock);
712 mtu->gadget_driver->disconnect(&mtu->g);
713 spin_lock(&mtu->lock);
714 }
715
716 mtu3_state_reset(mtu);
717 usb_gadget_set_state(&mtu->g, USB_STATE_NOTATTACHED);
718 }
719
mtu3_gadget_reset(struct mtu3 * mtu)720 void mtu3_gadget_reset(struct mtu3 *mtu)
721 {
722 dev_dbg(mtu->dev, "gadget RESET\n");
723
724 /* report disconnect, if we didn't flush EP state */
725 if (mtu->g.speed != USB_SPEED_UNKNOWN)
726 mtu3_gadget_disconnect(mtu);
727 else
728 mtu3_state_reset(mtu);
729 }
730