summaryrefslogtreecommitdiff
path: root/drivers/usb/host/xhci-mtk-sch.c
blob: 579899eb24c15245f3f70120b9f4df1e2a1de547 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2015 MediaTek Inc.
 * Author:
 *  Zhigang.Wei <zhigang.wei@mediatek.com>
 *  Chunfeng.Yun <chunfeng.yun@mediatek.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>

#include "xhci.h"
#include "xhci-mtk.h"

#define SSP_BW_BOUNDARY	130000
#define SS_BW_BOUNDARY	51000
/* table 5-5. High-speed Isoc Transaction Limits in usb_20 spec */
#define HS_BW_BOUNDARY	6144
/* usb2 spec section11.18.1: at most 188 FS bytes per microframe */
#define FS_PAYLOAD_MAX 188

#define DBG_BUF_EN	64

/* schedule error type */
#define ESCH_SS_Y6		1001
#define ESCH_SS_OVERLAP		1002
#define ESCH_CS_OVERFLOW	1003
#define ESCH_BW_OVERFLOW	1004
#define ESCH_FIXME		1005

/* mtk scheduler bitmasks */
#define EP_BPKTS(p)	((p) & 0x7f)
#define EP_BCSCOUNT(p)	(((p) & 0x7) << 8)
#define EP_BBM(p)	((p) << 11)
#define EP_BOFFSET(p)	((p) & 0x3fff)
#define EP_BREPEAT(p)	(((p) & 0x7fff) << 16)

static char *sch_error_string(int err_num)
{
	switch (err_num) {
	case ESCH_SS_Y6:
		return "Can't schedule Start-Split in Y6";
	case ESCH_SS_OVERLAP:
		return "Can't find a suitable Start-Split location";
	case ESCH_CS_OVERFLOW:
		return "The last Complete-Split is greater than 7";
	case ESCH_BW_OVERFLOW:
		return "Bandwidth exceeds the maximum limit";
	case ESCH_FIXME:
		return "FIXME, to be resolved";
	default:
		return "Unknown";
	}
}

static int is_fs_or_ls(enum usb_device_speed speed)
{
	return speed == USB_SPEED_FULL || speed == USB_SPEED_LOW;
}

static const char *
decode_ep(struct usb_host_endpoint *ep, enum usb_device_speed speed)
{
	static char buf[DBG_BUF_EN];
	struct usb_endpoint_descriptor *epd = &ep->desc;
	unsigned int interval;
	const char *unit;

	interval = usb_decode_interval(epd, speed);
	if (interval % 1000) {
		unit = "us";
	} else {
		unit = "ms";
		interval /= 1000;
	}

	snprintf(buf, DBG_BUF_EN, "%s ep%d%s %s, mpkt:%d, interval:%d/%d%s",
		 usb_speed_string(speed), usb_endpoint_num(epd),
		 usb_endpoint_dir_in(epd) ? "in" : "out",
		 usb_ep_type_string(usb_endpoint_type(epd)),
		 usb_endpoint_maxp(epd), epd->bInterval, interval, unit);

	return buf;
}

static u32 get_bw_boundary(enum usb_device_speed speed)
{
	u32 boundary;

	switch (speed) {
	case USB_SPEED_SUPER_PLUS:
		boundary = SSP_BW_BOUNDARY;
		break;
	case USB_SPEED_SUPER:
		boundary = SS_BW_BOUNDARY;
		break;
	default:
		boundary = HS_BW_BOUNDARY;
		break;
	}

	return boundary;
}

/*
* get the bandwidth domain which @ep belongs to.
*
* the bandwidth domain array is saved to @sch_array of struct xhci_hcd_mtk,
* each HS root port is treated as a single bandwidth domain,
* but each SS root port is treated as two bandwidth domains, one for IN eps,
* one for OUT eps.
* @real_port value is defined as follow according to xHCI spec:
* 1 for SSport0, ..., N+1 for SSportN, N+2 for HSport0, N+3 for HSport1, etc
* so the bandwidth domain array is organized as follow for simplification:
* SSport0-OUT, SSport0-IN, ..., SSportX-OUT, SSportX-IN, HSport0, ..., HSportY
*/
static struct mu3h_sch_bw_info *
get_bw_info(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
	    struct usb_host_endpoint *ep)
{
	struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
	struct xhci_virt_device *virt_dev;
	int bw_index;

	virt_dev = xhci->devs[udev->slot_id];
	if (!virt_dev->real_port) {
		WARN_ONCE(1, "%s invalid real_port\n", dev_name(&udev->dev));
		return NULL;
	}

	if (udev->speed >= USB_SPEED_SUPER) {
		if (usb_endpoint_dir_out(&ep->desc))
			bw_index = (virt_dev->real_port - 1) * 2;
		else
			bw_index = (virt_dev->real_port - 1) * 2 + 1;
	} else {
		/* add one more for each SS port */
		bw_index = virt_dev->real_port + xhci->usb3_rhub.num_ports - 1;
	}

	return &mtk->sch_array[bw_index];
}

static u32 get_esit(struct xhci_ep_ctx *ep_ctx)
{
	u32 esit;

	esit = 1 << CTX_TO_EP_INTERVAL(le32_to_cpu(ep_ctx->ep_info));
	if (esit > XHCI_MTK_MAX_ESIT)
		esit = XHCI_MTK_MAX_ESIT;

	return esit;
}

static struct mu3h_sch_tt *find_tt(struct usb_device *udev)
{
	struct usb_tt *utt = udev->tt;
	struct mu3h_sch_tt *tt, **tt_index, **ptt;
	bool allocated_index = false;

	if (!utt)
		return NULL;	/* Not below a TT */

	/*
	 * Find/create our data structure.
	 * For hubs with a single TT, we get it directly.
	 * For hubs with multiple TTs, there's an extra level of pointers.
	 */
	tt_index = NULL;
	if (utt->multi) {
		tt_index = utt->hcpriv;
		if (!tt_index) {	/* Create the index array */
			tt_index = kcalloc(utt->hub->maxchild,
					sizeof(*tt_index), GFP_KERNEL);
			if (!tt_index)
				return ERR_PTR(-ENOMEM);
			utt->hcpriv = tt_index;
			allocated_index = true;
		}
		ptt = &tt_index[udev->ttport - 1];
	} else {
		ptt = (struct mu3h_sch_tt **) &utt->hcpriv;
	}

	tt = *ptt;
	if (!tt) {	/* Create the mu3h_sch_tt */
		tt = kzalloc(sizeof(*tt), GFP_KERNEL);
		if (!tt) {
			if (allocated_index) {
				utt->hcpriv = NULL;
				kfree(tt_index);
			}
			return ERR_PTR(-ENOMEM);
		}
		INIT_LIST_HEAD(&tt->ep_list);
		*ptt = tt;
	}

	return tt;
}

/* Release the TT above udev, if it's not in use */
static void drop_tt(struct usb_device *udev)
{
	struct usb_tt *utt = udev->tt;
	struct mu3h_sch_tt *tt, **tt_index, **ptt;
	int i, cnt;

	if (!utt || !utt->hcpriv)
		return;		/* Not below a TT, or never allocated */

	cnt = 0;
	if (utt->multi) {
		tt_index = utt->hcpriv;
		ptt = &tt_index[udev->ttport - 1];
		/*  How many entries are left in tt_index? */
		for (i = 0; i < utt->hub->maxchild; ++i)
			cnt += !!tt_index[i];
	} else {
		tt_index = NULL;
		ptt = (struct mu3h_sch_tt **)&utt->hcpriv;
	}

	tt = *ptt;
	if (!tt || !list_empty(&tt->ep_list))
		return;		/* never allocated , or still in use*/

	*ptt = NULL;
	kfree(tt);

	if (cnt == 1) {
		utt->hcpriv = NULL;
		kfree(tt_index);
	}
}

static struct mu3h_sch_ep_info *
create_sch_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
	      struct usb_host_endpoint *ep)
{
	struct mu3h_sch_ep_info *sch_ep;
	struct mu3h_sch_bw_info *bw_info;
	struct mu3h_sch_tt *tt = NULL;

	bw_info = get_bw_info(mtk, udev, ep);
	if (!bw_info)
		return ERR_PTR(-ENODEV);

	sch_ep = kzalloc(sizeof(*sch_ep), GFP_KERNEL);
	if (!sch_ep)
		return ERR_PTR(-ENOMEM);

	if (is_fs_or_ls(udev->speed)) {
		tt = find_tt(udev);
		if (IS_ERR(tt)) {
			kfree(sch_ep);
			return ERR_PTR(-ENOMEM);
		}
	}

	sch_ep->bw_info = bw_info;
	sch_ep->sch_tt = tt;
	sch_ep->ep = ep;
	sch_ep->speed = udev->speed;
	INIT_LIST_HEAD(&sch_ep->endpoint);
	INIT_LIST_HEAD(&sch_ep->tt_endpoint);
	INIT_HLIST_NODE(&sch_ep->hentry);

	return sch_ep;
}

static void setup_sch_info(struct xhci_ep_ctx *ep_ctx,
			   struct mu3h_sch_ep_info *sch_ep)
{
	u32 ep_type;
	u32 maxpkt;
	u32 max_burst;
	u32 mult;
	u32 esit_pkts;
	u32 max_esit_payload;

	ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2));
	maxpkt = MAX_PACKET_DECODED(le32_to_cpu(ep_ctx->ep_info2));
	max_burst = CTX_TO_MAX_BURST(le32_to_cpu(ep_ctx->ep_info2));
	mult = CTX_TO_EP_MULT(le32_to_cpu(ep_ctx->ep_info));
	max_esit_payload =
		(CTX_TO_MAX_ESIT_PAYLOAD_HI(
			le32_to_cpu(ep_ctx->ep_info)) << 16) |
		 CTX_TO_MAX_ESIT_PAYLOAD(le32_to_cpu(ep_ctx->tx_info));

	sch_ep->esit = get_esit(ep_ctx);
	sch_ep->num_esit = XHCI_MTK_MAX_ESIT / sch_ep->esit;
	sch_ep->ep_type = ep_type;
	sch_ep->maxpkt = maxpkt;
	sch_ep->offset = 0;
	sch_ep->burst_mode = 0;
	sch_ep->repeat = 0;

	if (sch_ep->speed == USB_SPEED_HIGH) {
		sch_ep->cs_count = 0;

		/*
		 * usb_20 spec section5.9
		 * a single microframe is enough for HS synchromous endpoints
		 * in a interval
		 */
		sch_ep->num_budget_microframes = 1;

		/*
		 * xHCI spec section6.2.3.4
		 * @max_burst is the number of additional transactions
		 * opportunities per microframe
		 */
		sch_ep->pkts = max_burst + 1;
		sch_ep->bw_cost_per_microframe = maxpkt * sch_ep->pkts;
	} else if (sch_ep->speed >= USB_SPEED_SUPER) {
		/* usb3_r1 spec section4.4.7 & 4.4.8 */
		sch_ep->cs_count = 0;
		sch_ep->burst_mode = 1;
		/*
		 * some device's (d)wBytesPerInterval is set as 0,
		 * then max_esit_payload is 0, so evaluate esit_pkts from
		 * mult and burst
		 */
		esit_pkts = DIV_ROUND_UP(max_esit_payload, maxpkt);
		if (esit_pkts == 0)
			esit_pkts = (mult + 1) * (max_burst + 1);

		if (ep_type == INT_IN_EP || ep_type == INT_OUT_EP) {
			sch_ep->pkts = esit_pkts;
			sch_ep->num_budget_microframes = 1;
		}

		if (ep_type == ISOC_IN_EP || ep_type == ISOC_OUT_EP) {

			if (sch_ep->esit == 1)
				sch_ep->pkts = esit_pkts;
			else if (esit_pkts <= sch_ep->esit)
				sch_ep->pkts = 1;
			else
				sch_ep->pkts = roundup_pow_of_two(esit_pkts)
					/ sch_ep->esit;

			sch_ep->num_budget_microframes =
				DIV_ROUND_UP(esit_pkts, sch_ep->pkts);

			sch_ep->repeat = !!(sch_ep->num_budget_microframes > 1);
		}
		sch_ep->bw_cost_per_microframe = maxpkt * sch_ep->pkts;
	} else if (is_fs_or_ls(sch_ep->speed)) {
		sch_ep->pkts = 1; /* at most one packet for each microframe */

		/*
		 * num_budget_microframes and cs_count will be updated when
		 * check TT for INT_OUT_EP, ISOC/INT_IN_EP type
		 */
		sch_ep->cs_count = DIV_ROUND_UP(maxpkt, FS_PAYLOAD_MAX);
		sch_ep->num_budget_microframes = sch_ep->cs_count;
		sch_ep->bw_cost_per_microframe = min_t(u32, maxpkt, FS_PAYLOAD_MAX);
	}
}

/* Get maximum bandwidth when we schedule at offset slot. */
static u32 get_max_bw(struct mu3h_sch_bw_info *sch_bw,
	struct mu3h_sch_ep_info *sch_ep, u32 offset)
{
	u32 max_bw = 0;
	u32 bw;
	int i, j, k;

	for (i = 0; i < sch_ep->num_esit; i++) {
		u32 base = offset + i * sch_ep->esit;

		for (j = 0; j < sch_ep->num_budget_microframes; j++) {
			k = XHCI_MTK_BW_INDEX(base + j);
			bw = sch_bw->bus_bw[k] + sch_ep->bw_cost_per_microframe;
			if (bw > max_bw)
				max_bw = bw;
		}
	}
	return max_bw;
}

static void update_bus_bw(struct mu3h_sch_bw_info *sch_bw,
	struct mu3h_sch_ep_info *sch_ep, bool used)
{
	int bw_updated;
	u32 base;
	int i, j;

	bw_updated = sch_ep->bw_cost_per_microframe * (used ? 1 : -1);

	for (i = 0; i < sch_ep->num_esit; i++) {
		base = sch_ep->offset + i * sch_ep->esit;
		for (j = 0; j < sch_ep->num_budget_microframes; j++)
			sch_bw->bus_bw[XHCI_MTK_BW_INDEX(base + j)] += bw_updated;
	}
}

static int check_fs_bus_bw(struct mu3h_sch_ep_info *sch_ep, int offset)
{
	struct mu3h_sch_tt *tt = sch_ep->sch_tt;
	u32 tmp;
	int base;
	int i, j, k;

	for (i = 0; i < sch_ep->num_esit; i++) {
		base = offset + i * sch_ep->esit;

		/*
		 * Compared with hs bus, no matter what ep type,
		 * the hub will always delay one uframe to send data
		 */
		for (j = 0; j < sch_ep->num_budget_microframes; j++) {
			k = XHCI_MTK_BW_INDEX(base + j);
			tmp = tt->fs_bus_bw[k] + sch_ep->bw_cost_per_microframe;
			if (tmp > FS_PAYLOAD_MAX)
				return -ESCH_BW_OVERFLOW;
		}
	}

	return 0;
}

static int check_sch_tt(struct mu3h_sch_ep_info *sch_ep, u32 offset)
{
	u32 start_ss, last_ss;
	u32 start_cs, last_cs;

	if (!sch_ep->sch_tt)
		return 0;

	start_ss = offset % 8;

	if (sch_ep->ep_type == ISOC_OUT_EP) {
		last_ss = start_ss + sch_ep->cs_count - 1;

		/*
		 * usb_20 spec section11.18:
		 * must never schedule Start-Split in Y6
		 */
		if (!(start_ss == 7 || last_ss < 6))
			return -ESCH_SS_Y6;

	} else {
		u32 cs_count = DIV_ROUND_UP(sch_ep->maxpkt, FS_PAYLOAD_MAX);

		/*
		 * usb_20 spec section11.18:
		 * must never schedule Start-Split in Y6
		 */
		if (start_ss == 6)
			return -ESCH_SS_Y6;

		/* one uframe for ss + one uframe for idle */
		start_cs = (start_ss + 2) % 8;
		last_cs = start_cs + cs_count - 1;

		if (last_cs > 7)
			return -ESCH_CS_OVERFLOW;

		if (cs_count > 7)
			cs_count = 7; /* HW limit */

		sch_ep->cs_count = cs_count;
		/* ss, idle are ignored */
		sch_ep->num_budget_microframes = cs_count;

		/*
		 * if interval=1, maxp >752, num_budge_micoframe is larger
		 * than sch_ep->esit, will overstep boundary
		 */
		if (sch_ep->num_budget_microframes > sch_ep->esit)
			sch_ep->num_budget_microframes = sch_ep->esit;
	}

	return check_fs_bus_bw(sch_ep, offset);
}

static void update_sch_tt(struct mu3h_sch_ep_info *sch_ep, bool used)
{
	struct mu3h_sch_tt *tt = sch_ep->sch_tt;
	int bw_updated;
	u32 base;
	int i, j;

	bw_updated = sch_ep->bw_cost_per_microframe * (used ? 1 : -1);

	for (i = 0; i < sch_ep->num_esit; i++) {
		base = sch_ep->offset + i * sch_ep->esit;

		for (j = 0; j < sch_ep->num_budget_microframes; j++)
			tt->fs_bus_bw[XHCI_MTK_BW_INDEX(base + j)] += bw_updated;
	}

	if (used)
		list_add_tail(&sch_ep->tt_endpoint, &tt->ep_list);
	else
		list_del(&sch_ep->tt_endpoint);
}

static int load_ep_bw(struct mu3h_sch_bw_info *sch_bw,
		      struct mu3h_sch_ep_info *sch_ep, bool loaded)
{
	if (sch_ep->sch_tt)
		update_sch_tt(sch_ep, loaded);

	/* update bus bandwidth info */
	update_bus_bw(sch_bw, sch_ep, loaded);
	sch_ep->allocated = loaded;

	return 0;
}

static int check_sch_bw(struct mu3h_sch_ep_info *sch_ep)
{
	struct mu3h_sch_bw_info *sch_bw = sch_ep->bw_info;
	const u32 bw_boundary = get_bw_boundary(sch_ep->speed);
	u32 offset;
	u32 worst_bw;
	u32 min_bw = ~0;
	int min_index = -1;
	int ret = 0;

	/*
	 * Search through all possible schedule microframes.
	 * and find a microframe where its worst bandwidth is minimum.
	 */
	for (offset = 0; offset < sch_ep->esit; offset++) {
		ret = check_sch_tt(sch_ep, offset);
		if (ret)
			continue;

		worst_bw = get_max_bw(sch_bw, sch_ep, offset);
		if (worst_bw > bw_boundary)
			continue;

		if (min_bw > worst_bw) {
			min_bw = worst_bw;
			min_index = offset;
		}

		/* use first-fit for LS/FS */
		if (sch_ep->sch_tt && min_index >= 0)
			break;

		if (min_bw == 0)
			break;
	}

	if (min_index < 0)
		return ret ? ret : -ESCH_BW_OVERFLOW;

	sch_ep->offset = min_index;

	return load_ep_bw(sch_bw, sch_ep, true);
}

static void destroy_sch_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
			   struct mu3h_sch_ep_info *sch_ep)
{
	/* only release ep bw check passed by check_sch_bw() */
	if (sch_ep->allocated)
		load_ep_bw(sch_ep->bw_info, sch_ep, false);

	if (sch_ep->sch_tt)
		drop_tt(udev);

	list_del(&sch_ep->endpoint);
	hlist_del(&sch_ep->hentry);
	kfree(sch_ep);
}

static bool need_bw_sch(struct usb_device *udev,
			struct usb_host_endpoint *ep)
{
	bool has_tt = udev->tt && udev->tt->hub->parent;

	/* only for periodic endpoints */
	if (usb_endpoint_xfer_control(&ep->desc)
		|| usb_endpoint_xfer_bulk(&ep->desc))
		return false;

	/*
	 * for LS & FS periodic endpoints which its device is not behind
	 * a TT are also ignored, root-hub will schedule them directly,
	 * but need set @bpkts field of endpoint context to 1.
	 */
	if (is_fs_or_ls(udev->speed) && !has_tt)
		return false;

	/* skip endpoint with zero maxpkt */
	if (usb_endpoint_maxp(&ep->desc) == 0)
		return false;

	return true;
}

int xhci_mtk_sch_init(struct xhci_hcd_mtk *mtk)
{
	struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
	struct mu3h_sch_bw_info *sch_array;
	int num_usb_bus;

	/* ss IN and OUT are separated */
	num_usb_bus = xhci->usb3_rhub.num_ports * 2 + xhci->usb2_rhub.num_ports;

	sch_array = kcalloc(num_usb_bus, sizeof(*sch_array), GFP_KERNEL);
	if (sch_array == NULL)
		return -ENOMEM;

	mtk->sch_array = sch_array;

	INIT_LIST_HEAD(&mtk->bw_ep_chk_list);
	hash_init(mtk->sch_ep_hash);

	return 0;
}

void xhci_mtk_sch_exit(struct xhci_hcd_mtk *mtk)
{
	kfree(mtk->sch_array);
}

static int add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
			struct usb_host_endpoint *ep)
{
	struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
	struct xhci_ep_ctx *ep_ctx;
	struct xhci_virt_device *virt_dev;
	struct mu3h_sch_ep_info *sch_ep;
	unsigned int ep_index;

	virt_dev = xhci->devs[udev->slot_id];
	ep_index = xhci_get_endpoint_index(&ep->desc);
	ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);

	if (!need_bw_sch(udev, ep)) {
		/*
		 * set @bpkts to 1 if it is LS or FS periodic endpoint, and its
		 * device does not connected through an external HS hub
		 */
		if (usb_endpoint_xfer_int(&ep->desc)
			|| usb_endpoint_xfer_isoc(&ep->desc))
			ep_ctx->reserved[0] = cpu_to_le32(EP_BPKTS(1));

		return 0;
	}

	xhci_dbg(xhci, "%s %s\n", __func__, decode_ep(ep, udev->speed));

	sch_ep = create_sch_ep(mtk, udev, ep);
	if (IS_ERR_OR_NULL(sch_ep))
		return -ENOMEM;

	setup_sch_info(ep_ctx, sch_ep);

	list_add_tail(&sch_ep->endpoint, &mtk->bw_ep_chk_list);
	hash_add(mtk->sch_ep_hash, &sch_ep->hentry, (unsigned long)ep);

	return 0;
}

static void drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
			  struct usb_host_endpoint *ep)
{
	struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
	struct mu3h_sch_ep_info *sch_ep;
	struct hlist_node *hn;

	if (!need_bw_sch(udev, ep))
		return;

	xhci_dbg(xhci, "%s %s\n", __func__, decode_ep(ep, udev->speed));

	hash_for_each_possible_safe(mtk->sch_ep_hash, sch_ep,
				    hn, hentry, (unsigned long)ep) {
		if (sch_ep->ep == ep) {
			destroy_sch_ep(mtk, udev, sch_ep);
			break;
		}
	}
}

int xhci_mtk_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
{
	struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
	struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
	struct mu3h_sch_ep_info *sch_ep;
	int ret;

	xhci_dbg(xhci, "%s() udev %s\n", __func__, dev_name(&udev->dev));

	list_for_each_entry(sch_ep, &mtk->bw_ep_chk_list, endpoint) {
		struct xhci_ep_ctx *ep_ctx;
		struct usb_host_endpoint *ep = sch_ep->ep;
		unsigned int ep_index = xhci_get_endpoint_index(&ep->desc);

		ret = check_sch_bw(sch_ep);
		if (ret) {
			xhci_err(xhci, "Not enough bandwidth! (%s)\n",
				 sch_error_string(-ret));
			return -ENOSPC;
		}

		ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
		ep_ctx->reserved[0] = cpu_to_le32(EP_BPKTS(sch_ep->pkts)
			| EP_BCSCOUNT(sch_ep->cs_count)
			| EP_BBM(sch_ep->burst_mode));
		ep_ctx->reserved[1] = cpu_to_le32(EP_BOFFSET(sch_ep->offset)
			| EP_BREPEAT(sch_ep->repeat));

		xhci_dbg(xhci, " PKTS:%x, CSCOUNT:%x, BM:%x, OFFSET:%x, REPEAT:%x\n",
			sch_ep->pkts, sch_ep->cs_count, sch_ep->burst_mode,
			sch_ep->offset, sch_ep->repeat);
	}

	ret = xhci_check_bandwidth(hcd, udev);
	if (!ret)
		list_del_init(&mtk->bw_ep_chk_list);

	return ret;
}

void xhci_mtk_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
{
	struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
	struct mu3h_sch_ep_info *sch_ep, *tmp;

	xhci_dbg(xhci, "%s() udev %s\n", __func__, dev_name(&udev->dev));

	list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_chk_list, endpoint)
		destroy_sch_ep(mtk, udev, sch_ep);

	xhci_reset_bandwidth(hcd, udev);
}

int xhci_mtk_add_ep(struct usb_hcd *hcd, struct usb_device *udev,
		    struct usb_host_endpoint *ep)
{
	int ret;

	ret = xhci_add_endpoint(hcd, udev, ep);
	if (ret)
		return ret;

	if (ep->hcpriv)
		ret = add_ep_quirk(hcd, udev, ep);

	return ret;
}

int xhci_mtk_drop_ep(struct usb_hcd *hcd, struct usb_device *udev,
		     struct usb_host_endpoint *ep)
{
	int ret;

	ret = xhci_drop_endpoint(hcd, udev, ep);
	if (ret)
		return ret;

	/* needn't check @ep->hcpriv, xhci_endpoint_disable set it NULL */
	drop_ep_quirk(hcd, udev, ep);

	return 0;
}