1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2015 MediaTek Inc.
5 * Zhigang.Wei <zhigang.wei@mediatek.com>
6 * Chunfeng.Yun <chunfeng.yun@mediatek.com>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/slab.h>
16 #define SSP_BW_BOUNDARY 130000
17 #define SS_BW_BOUNDARY 51000
18 /* table 5-5. High-speed Isoc Transaction Limits in usb_20 spec */
19 #define HS_BW_BOUNDARY 6144
20 /* usb2 spec section11.18.1: at most 188 FS bytes per microframe */
21 #define FS_PAYLOAD_MAX 188
22 #define LS_PAYLOAD_MAX 18
23 /* section 11.18.1, per fs frame */
24 #define FS_BW_BOUNDARY 1157
25 #define LS_BW_BOUNDARY 144
28 * max number of microframes for split transfer, assume extra-cs budget is 0
29 * for fs isoc in : 1 ss + 1 idle + 6 cs (roundup(1023/188))
31 #define TT_MICROFRAMES_MAX 8
32 /* offset from SS for fs/ls isoc/intr ep (ss + idle) */
37 /* schedule error type */
38 #define ESCH_SS_Y6 1001
39 #define ESCH_SS_OVERLAP 1002
40 #define ESCH_CS_OVERFLOW 1003
41 #define ESCH_BW_OVERFLOW 1004
42 #define ESCH_FIXME 1005
44 /* mtk scheduler bitmasks */
45 #define EP_BPKTS(p) ((p) & 0x7f)
46 #define EP_BCSCOUNT(p) (((p) & 0x7) << 8)
47 #define EP_BBM(p) ((p) << 11)
48 #define EP_BOFFSET(p) ((p) & 0x3fff)
49 #define EP_BREPEAT(p) (((p) & 0x7fff) << 16)
51 static char *sch_error_string(int err_num)
55 return "Can't schedule Start-Split in Y6";
57 return "Can't find a suitable Start-Split location";
58 case ESCH_CS_OVERFLOW:
59 return "The last Complete-Split is greater than 7";
60 case ESCH_BW_OVERFLOW:
61 return "Bandwidth exceeds the maximum limit";
63 return "FIXME, to be resolved";
69 static int is_fs_or_ls(enum usb_device_speed speed)
71 return speed == USB_SPEED_FULL || speed == USB_SPEED_LOW;
75 decode_ep(struct usb_host_endpoint *ep, enum usb_device_speed speed)
77 static char buf[DBG_BUF_EN];
78 struct usb_endpoint_descriptor *epd = &ep->desc;
79 unsigned int interval;
82 interval = usb_decode_interval(epd, speed);
83 if (interval % 1000) {
90 snprintf(buf, DBG_BUF_EN, "%s ep%d%s %s, mpkt:%d, interval:%d/%d%s",
91 usb_speed_string(speed), usb_endpoint_num(epd),
92 usb_endpoint_dir_in(epd) ? "in" : "out",
93 usb_ep_type_string(usb_endpoint_type(epd)),
94 usb_endpoint_maxp(epd), epd->bInterval, interval, unit);
99 static u32 get_bw_boundary(enum usb_device_speed speed)
104 case USB_SPEED_SUPER_PLUS:
105 boundary = SSP_BW_BOUNDARY;
107 case USB_SPEED_SUPER:
108 boundary = SS_BW_BOUNDARY;
111 boundary = HS_BW_BOUNDARY;
119 * get the bandwidth domain which @ep belongs to.
121 * the bandwidth domain array is saved to @sch_array of struct xhci_hcd_mtk,
122 * each HS root port is treated as a single bandwidth domain,
123 * but each SS root port is treated as two bandwidth domains, one for IN eps,
125 * @real_port value is defined as follow according to xHCI spec:
126 * 1 for SSport0, ..., N+1 for SSportN, N+2 for HSport0, N+3 for HSport1, etc
127 * so the bandwidth domain array is organized as follow for simplification:
128 * SSport0-OUT, SSport0-IN, ..., SSportX-OUT, SSportX-IN, HSport0, ..., HSportY
130 static struct mu3h_sch_bw_info *
131 get_bw_info(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
132 struct usb_host_endpoint *ep)
134 struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
135 struct xhci_virt_device *virt_dev;
138 virt_dev = xhci->devs[udev->slot_id];
139 if (!virt_dev->real_port) {
140 WARN_ONCE(1, "%s invalid real_port\n", dev_name(&udev->dev));
144 if (udev->speed >= USB_SPEED_SUPER) {
145 if (usb_endpoint_dir_out(&ep->desc))
146 bw_index = (virt_dev->real_port - 1) * 2;
148 bw_index = (virt_dev->real_port - 1) * 2 + 1;
150 /* add one more for each SS port */
151 bw_index = virt_dev->real_port + xhci->usb3_rhub.num_ports - 1;
154 return &mtk->sch_array[bw_index];
157 static u32 get_esit(struct xhci_ep_ctx *ep_ctx)
161 esit = 1 << CTX_TO_EP_INTERVAL(le32_to_cpu(ep_ctx->ep_info));
162 if (esit > XHCI_MTK_MAX_ESIT)
163 esit = XHCI_MTK_MAX_ESIT;
168 static struct mu3h_sch_tt *find_tt(struct usb_device *udev)
170 struct usb_tt *utt = udev->tt;
171 struct mu3h_sch_tt *tt, **tt_index, **ptt;
172 bool allocated_index = false;
175 return NULL; /* Not below a TT */
178 * Find/create our data structure.
179 * For hubs with a single TT, we get it directly.
180 * For hubs with multiple TTs, there's an extra level of pointers.
184 tt_index = utt->hcpriv;
185 if (!tt_index) { /* Create the index array */
186 tt_index = kcalloc(utt->hub->maxchild,
187 sizeof(*tt_index), GFP_KERNEL);
189 return ERR_PTR(-ENOMEM);
190 utt->hcpriv = tt_index;
191 allocated_index = true;
193 ptt = &tt_index[udev->ttport - 1];
195 ptt = (struct mu3h_sch_tt **) &utt->hcpriv;
199 if (!tt) { /* Create the mu3h_sch_tt */
200 tt = kzalloc(sizeof(*tt), GFP_KERNEL);
202 if (allocated_index) {
206 return ERR_PTR(-ENOMEM);
208 INIT_LIST_HEAD(&tt->ep_list);
215 /* Release the TT above udev, if it's not in use */
216 static void drop_tt(struct usb_device *udev)
218 struct usb_tt *utt = udev->tt;
219 struct mu3h_sch_tt *tt, **tt_index, **ptt;
222 if (!utt || !utt->hcpriv)
223 return; /* Not below a TT, or never allocated */
227 tt_index = utt->hcpriv;
228 ptt = &tt_index[udev->ttport - 1];
229 /* How many entries are left in tt_index? */
230 for (i = 0; i < utt->hub->maxchild; ++i)
231 cnt += !!tt_index[i];
234 ptt = (struct mu3h_sch_tt **)&utt->hcpriv;
238 if (!tt || !list_empty(&tt->ep_list))
239 return; /* never allocated , or still in use*/
250 static struct mu3h_sch_ep_info *
251 create_sch_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
252 struct usb_host_endpoint *ep, struct xhci_ep_ctx *ep_ctx)
254 struct mu3h_sch_ep_info *sch_ep;
255 struct mu3h_sch_bw_info *bw_info;
256 struct mu3h_sch_tt *tt = NULL;
259 bw_info = get_bw_info(mtk, udev, ep);
261 return ERR_PTR(-ENODEV);
263 if (is_fs_or_ls(udev->speed))
264 len = TT_MICROFRAMES_MAX;
265 else if ((udev->speed >= USB_SPEED_SUPER) &&
266 usb_endpoint_xfer_isoc(&ep->desc))
267 len = get_esit(ep_ctx);
271 sch_ep = kzalloc(struct_size(sch_ep, bw_budget_table, len), GFP_KERNEL);
273 return ERR_PTR(-ENOMEM);
275 if (is_fs_or_ls(udev->speed)) {
279 return ERR_PTR(-ENOMEM);
283 sch_ep->bw_info = bw_info;
286 sch_ep->speed = udev->speed;
287 INIT_LIST_HEAD(&sch_ep->endpoint);
288 INIT_LIST_HEAD(&sch_ep->tt_endpoint);
289 INIT_HLIST_NODE(&sch_ep->hentry);
294 static void setup_sch_info(struct xhci_ep_ctx *ep_ctx,
295 struct mu3h_sch_ep_info *sch_ep)
302 u32 max_esit_payload;
303 u32 bw_per_microframe;
307 bwb_table = sch_ep->bw_budget_table;
308 ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2));
309 maxpkt = MAX_PACKET_DECODED(le32_to_cpu(ep_ctx->ep_info2));
310 max_burst = CTX_TO_MAX_BURST(le32_to_cpu(ep_ctx->ep_info2));
311 mult = CTX_TO_EP_MULT(le32_to_cpu(ep_ctx->ep_info));
313 (CTX_TO_MAX_ESIT_PAYLOAD_HI(
314 le32_to_cpu(ep_ctx->ep_info)) << 16) |
315 CTX_TO_MAX_ESIT_PAYLOAD(le32_to_cpu(ep_ctx->tx_info));
317 sch_ep->esit = get_esit(ep_ctx);
318 sch_ep->num_esit = XHCI_MTK_MAX_ESIT / sch_ep->esit;
319 sch_ep->ep_type = ep_type;
320 sch_ep->maxpkt = maxpkt;
322 sch_ep->burst_mode = 0;
325 if (sch_ep->speed == USB_SPEED_HIGH) {
326 sch_ep->cs_count = 0;
329 * usb_20 spec section5.9
330 * a single microframe is enough for HS synchromous endpoints
333 sch_ep->num_budget_microframes = 1;
336 * xHCI spec section6.2.3.4
337 * @max_burst is the number of additional transactions
338 * opportunities per microframe
340 sch_ep->pkts = max_burst + 1;
341 bwb_table[0] = maxpkt * sch_ep->pkts;
342 } else if (sch_ep->speed >= USB_SPEED_SUPER) {
343 /* usb3_r1 spec section4.4.7 & 4.4.8 */
344 sch_ep->cs_count = 0;
345 sch_ep->burst_mode = 1;
347 * some device's (d)wBytesPerInterval is set as 0,
348 * then max_esit_payload is 0, so evaluate esit_pkts from
351 esit_pkts = DIV_ROUND_UP(max_esit_payload, maxpkt);
353 esit_pkts = (mult + 1) * (max_burst + 1);
355 if (ep_type == INT_IN_EP || ep_type == INT_OUT_EP) {
356 sch_ep->pkts = esit_pkts;
357 sch_ep->num_budget_microframes = 1;
358 bwb_table[0] = maxpkt * sch_ep->pkts;
361 if (ep_type == ISOC_IN_EP || ep_type == ISOC_OUT_EP) {
363 if (sch_ep->esit == 1)
364 sch_ep->pkts = esit_pkts;
365 else if (esit_pkts <= sch_ep->esit)
368 sch_ep->pkts = roundup_pow_of_two(esit_pkts)
371 sch_ep->num_budget_microframes =
372 DIV_ROUND_UP(esit_pkts, sch_ep->pkts);
374 sch_ep->repeat = !!(sch_ep->num_budget_microframes > 1);
375 bw_per_microframe = maxpkt * sch_ep->pkts;
377 for (i = 0; i < sch_ep->num_budget_microframes - 1; i++)
378 bwb_table[i] = bw_per_microframe;
380 /* last one <= bw_per_microframe */
381 bwb_table[i] = maxpkt * esit_pkts - i * bw_per_microframe;
383 } else if (is_fs_or_ls(sch_ep->speed)) {
384 sch_ep->pkts = 1; /* at most one packet for each microframe */
387 * @cs_count will be updated to add extra-cs when
388 * check TT for INT_OUT_EP, ISOC/INT_IN_EP type
391 sch_ep->cs_count = DIV_ROUND_UP(maxpkt, FS_PAYLOAD_MAX);
392 sch_ep->num_budget_microframes = sch_ep->cs_count;
394 /* init budget table */
395 if (ep_type == ISOC_OUT_EP) {
396 for (i = 0; i < sch_ep->cs_count - 1; i++)
397 bwb_table[i] = FS_PAYLOAD_MAX;
399 bwb_table[i] = maxpkt - i * FS_PAYLOAD_MAX;
400 } else if (ep_type == INT_OUT_EP) {
401 /* only first one used (maxpkt <= 64), others zero */
402 bwb_table[0] = maxpkt;
403 } else { /* INT_IN_EP or ISOC_IN_EP */
404 bwb_table[0] = 0; /* start split */
405 bwb_table[1] = 0; /* idle */
407 * @cs_count will be updated according to cs position
408 * (add 1 or 2 extra-cs), but assume only first
409 * @num_budget_microframes elements will be used later,
410 * although in fact it does not (extra-cs budget many receive
411 * some data for IN ep);
412 * @cs_count is 1 for INT_IN_EP (maxpkt <= 64);
414 for (i = 0; i < sch_ep->cs_count - 1; i++)
415 bwb_table[i + CS_OFFSET] = FS_PAYLOAD_MAX;
417 bwb_table[i + CS_OFFSET] = maxpkt - i * FS_PAYLOAD_MAX;
419 sch_ep->num_budget_microframes += CS_OFFSET;
424 /* Get maximum bandwidth when we schedule at offset slot. */
425 static u32 get_max_bw(struct mu3h_sch_bw_info *sch_bw,
426 struct mu3h_sch_ep_info *sch_ep, u32 offset)
432 for (i = 0; i < sch_ep->num_esit; i++) {
433 u32 base = offset + i * sch_ep->esit;
435 for (j = 0; j < sch_ep->num_budget_microframes; j++) {
436 k = XHCI_MTK_BW_INDEX(base + j);
437 bw = sch_bw->bus_bw[k] + sch_ep->bw_budget_table[j];
446 * for OUT: get first SS consumed bw;
447 * for IN: get first CS consumed bw;
449 static u16 get_fs_bw(struct mu3h_sch_ep_info *sch_ep, int offset)
451 struct mu3h_sch_tt *tt = sch_ep->sch_tt;
454 if (sch_ep->ep_type == ISOC_OUT_EP || sch_ep->ep_type == INT_OUT_EP)
455 fs_bw = tt->fs_bus_bw_out[XHCI_MTK_BW_INDEX(offset)];
456 else /* skip ss + idle */
457 fs_bw = tt->fs_bus_bw_in[XHCI_MTK_BW_INDEX(offset + CS_OFFSET)];
462 static void update_bus_bw(struct mu3h_sch_bw_info *sch_bw,
463 struct mu3h_sch_ep_info *sch_ep, bool used)
468 for (i = 0; i < sch_ep->num_esit; i++) {
469 base = sch_ep->offset + i * sch_ep->esit;
470 for (j = 0; j < sch_ep->num_budget_microframes; j++) {
471 k = XHCI_MTK_BW_INDEX(base + j);
473 sch_bw->bus_bw[k] += sch_ep->bw_budget_table[j];
475 sch_bw->bus_bw[k] -= sch_ep->bw_budget_table[j];
480 static int check_ls_budget_microframes(struct mu3h_sch_ep_info *sch_ep, int offset)
482 struct mu3h_sch_tt *tt = sch_ep->sch_tt;
485 if (sch_ep->speed != USB_SPEED_LOW)
488 if (sch_ep->ep_type == INT_OUT_EP)
489 i = XHCI_MTK_BW_INDEX(offset);
490 else if (sch_ep->ep_type == INT_IN_EP)
491 i = XHCI_MTK_BW_INDEX(offset + CS_OFFSET); /* skip ss + idle */
495 if (tt->ls_bus_bw[i] + sch_ep->maxpkt > LS_PAYLOAD_MAX)
496 return -ESCH_BW_OVERFLOW;
501 static int check_fs_budget_microframes(struct mu3h_sch_ep_info *sch_ep, int offset)
503 struct mu3h_sch_tt *tt = sch_ep->sch_tt;
508 * for OUT eps, will transfer exactly assigned length of data,
509 * so can't allocate more than 188 bytes;
510 * but it's not for IN eps, usually it can't receive full
511 * 188 bytes in a uframe, if it not assign full 188 bytes,
512 * can add another one;
514 for (i = 0; i < sch_ep->num_budget_microframes; i++) {
515 k = XHCI_MTK_BW_INDEX(offset + i);
516 if (sch_ep->ep_type == ISOC_OUT_EP || sch_ep->ep_type == INT_OUT_EP)
517 tmp = tt->fs_bus_bw_out[k] + sch_ep->bw_budget_table[i];
518 else /* ep_type : ISOC IN / INTR IN */
519 tmp = tt->fs_bus_bw_in[k];
521 if (tmp > FS_PAYLOAD_MAX)
522 return -ESCH_BW_OVERFLOW;
528 static int check_fs_budget_frames(struct mu3h_sch_ep_info *sch_ep, int offset)
530 struct mu3h_sch_tt *tt = sch_ep->sch_tt;
534 /* bugdet scheduled may cross at most two fs frames */
535 j = XHCI_MTK_BW_INDEX(offset) / UFRAMES_PER_FRAME;
536 k = XHCI_MTK_BW_INDEX(offset + sch_ep->num_budget_microframes - 1) / UFRAMES_PER_FRAME;
539 head = tt->fs_frame_bw[j];
540 tail = tt->fs_frame_bw[k];
542 head = tt->fs_frame_bw[j];
546 j = roundup(offset, UFRAMES_PER_FRAME);
547 for (i = 0; i < sch_ep->num_budget_microframes; i++) {
548 if ((offset + i) < j)
549 head += sch_ep->bw_budget_table[i];
551 tail += sch_ep->bw_budget_table[i];
554 if (head > FS_BW_BOUNDARY || tail > FS_BW_BOUNDARY)
555 return -ESCH_BW_OVERFLOW;
560 static int check_fs_bus_bw(struct mu3h_sch_ep_info *sch_ep, int offset)
565 for (i = 0; i < sch_ep->num_esit; i++) {
566 base = offset + i * sch_ep->esit;
568 ret = check_ls_budget_microframes(sch_ep, base);
572 ret = check_fs_budget_microframes(sch_ep, base);
576 ret = check_fs_budget_frames(sch_ep, base);
585 static int check_ss_and_cs(struct mu3h_sch_ep_info *sch_ep, u32 offset)
587 u32 start_ss, last_ss;
588 u32 start_cs, last_cs;
590 start_ss = offset % UFRAMES_PER_FRAME;
592 if (sch_ep->ep_type == ISOC_OUT_EP) {
593 last_ss = start_ss + sch_ep->cs_count - 1;
596 * usb_20 spec section11.18:
597 * must never schedule Start-Split in Y6
599 if (!(start_ss == 7 || last_ss < 6))
603 /* maxpkt <= 1023, cs <= 6 */
604 u32 cs_count = DIV_ROUND_UP(sch_ep->maxpkt, FS_PAYLOAD_MAX);
607 * usb_20 spec section11.18:
608 * must never schedule Start-Split in Y6
613 /* one uframe for ss + one uframe for idle */
614 start_cs = (start_ss + CS_OFFSET) % UFRAMES_PER_FRAME;
615 last_cs = start_cs + cs_count - 1;
617 return -ESCH_CS_OVERFLOW;
620 cs_count += (last_cs == 7) ? 1 : 2;
622 cs_count = 7; /* HW limit */
624 sch_ep->cs_count = cs_count;
632 * when isoc-out transfers 188 bytes in a uframe, and send isoc/intr's
633 * ss token in the uframe, may cause 'bit stuff error' in downstream
635 * when isoc-out transfer less than 188 bytes in a uframe, shall send
636 * isoc-in's ss after isoc-out's ss (but hw can't ensure the sequence,
637 * so just avoid overlap).
639 static int check_isoc_ss_overlap(struct mu3h_sch_ep_info *sch_ep, u32 offset)
641 struct mu3h_sch_tt *tt = sch_ep->sch_tt;
648 for (i = 0; i < sch_ep->num_esit; i++) {
649 base = offset + i * sch_ep->esit;
651 if (sch_ep->ep_type == ISOC_OUT_EP) {
652 for (j = 0; j < sch_ep->num_budget_microframes; j++) {
653 k = XHCI_MTK_BW_INDEX(base + j);
654 if (tt->in_ss_cnt[k])
655 return -ESCH_SS_OVERLAP;
657 } else if (sch_ep->ep_type == ISOC_IN_EP || sch_ep->ep_type == INT_IN_EP) {
658 k = XHCI_MTK_BW_INDEX(base);
659 /* only check IN's ss */
660 if (tt->fs_bus_bw_out[k])
661 return -ESCH_SS_OVERLAP;
668 static int check_sch_tt_budget(struct mu3h_sch_ep_info *sch_ep, u32 offset)
672 ret = check_ss_and_cs(sch_ep, offset);
676 ret = check_isoc_ss_overlap(sch_ep, offset);
680 return check_fs_bus_bw(sch_ep, offset);
683 /* allocate microframes in the ls/fs frame */
684 static int alloc_sch_portion_of_frame(struct mu3h_sch_ep_info *sch_ep)
686 struct mu3h_sch_bw_info *sch_bw = sch_ep->bw_info;
687 const u32 bw_boundary = get_bw_boundary(sch_ep->speed);
688 u32 bw_max, fs_bw_min;
689 u32 offset, offset_min;
695 frames = sch_ep->esit / UFRAMES_PER_FRAME;
697 for (i = 0; i < UFRAMES_PER_FRAME; i++) {
698 fs_bw_min = FS_PAYLOAD_MAX;
699 offset_min = XHCI_MTK_MAX_ESIT;
701 for (j = 0; j < frames; j++) {
702 offset = (i + j * UFRAMES_PER_FRAME) % sch_ep->esit;
704 ret = check_sch_tt_budget(sch_ep, offset);
708 /* check hs bw domain */
709 bw_max = get_max_bw(sch_bw, sch_ep, offset);
710 if (bw_max > bw_boundary) {
711 ret = -ESCH_BW_OVERFLOW;
715 /* use best-fit between frames */
716 fs_bw = get_fs_bw(sch_ep, offset);
717 if (fs_bw < fs_bw_min) {
726 /* use first-fit between microframes in a frame */
727 if (offset_min < XHCI_MTK_MAX_ESIT)
731 if (offset_min == XHCI_MTK_MAX_ESIT)
732 return -ESCH_BW_OVERFLOW;
734 sch_ep->offset = offset_min;
739 static void update_sch_tt(struct mu3h_sch_ep_info *sch_ep, bool used)
741 struct mu3h_sch_tt *tt = sch_ep->sch_tt;
746 if (sch_ep->ep_type == ISOC_OUT_EP || sch_ep->ep_type == INT_OUT_EP)
747 fs_bus_bw = tt->fs_bus_bw_out;
749 fs_bus_bw = tt->fs_bus_bw_in;
751 for (i = 0; i < sch_ep->num_esit; i++) {
752 base = sch_ep->offset + i * sch_ep->esit;
754 for (j = 0; j < sch_ep->num_budget_microframes; j++) {
755 k = XHCI_MTK_BW_INDEX(base + j);
756 f = k / UFRAMES_PER_FRAME;
758 if (sch_ep->speed == USB_SPEED_LOW)
759 tt->ls_bus_bw[k] += (u8)sch_ep->bw_budget_table[j];
761 fs_bus_bw[k] += (u16)sch_ep->bw_budget_table[j];
762 tt->fs_frame_bw[f] += (u16)sch_ep->bw_budget_table[j];
764 if (sch_ep->speed == USB_SPEED_LOW)
765 tt->ls_bus_bw[k] -= (u8)sch_ep->bw_budget_table[j];
767 fs_bus_bw[k] -= (u16)sch_ep->bw_budget_table[j];
768 tt->fs_frame_bw[f] -= (u16)sch_ep->bw_budget_table[j];
772 if (sch_ep->ep_type == ISOC_IN_EP || sch_ep->ep_type == INT_IN_EP) {
773 k = XHCI_MTK_BW_INDEX(base);
782 list_add_tail(&sch_ep->tt_endpoint, &tt->ep_list);
784 list_del(&sch_ep->tt_endpoint);
787 static int load_ep_bw(struct mu3h_sch_bw_info *sch_bw,
788 struct mu3h_sch_ep_info *sch_ep, bool loaded)
791 update_sch_tt(sch_ep, loaded);
793 /* update bus bandwidth info */
794 update_bus_bw(sch_bw, sch_ep, loaded);
795 sch_ep->allocated = loaded;
800 /* allocate microframes for hs/ss/ssp */
801 static int alloc_sch_microframes(struct mu3h_sch_ep_info *sch_ep)
803 struct mu3h_sch_bw_info *sch_bw = sch_ep->bw_info;
804 const u32 bw_boundary = get_bw_boundary(sch_ep->speed);
811 * Search through all possible schedule microframes.
812 * and find a microframe where its worst bandwidth is minimum.
814 for (offset = 0; offset < sch_ep->esit; offset++) {
816 worst_bw = get_max_bw(sch_bw, sch_ep, offset);
817 if (worst_bw > bw_boundary)
820 if (min_bw > worst_bw) {
827 return -ESCH_BW_OVERFLOW;
829 sch_ep->offset = min_index;
834 static int check_sch_bw(struct mu3h_sch_ep_info *sch_ep)
839 ret = alloc_sch_portion_of_frame(sch_ep);
841 ret = alloc_sch_microframes(sch_ep);
846 return load_ep_bw(sch_ep->bw_info, sch_ep, true);
849 static void destroy_sch_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
850 struct mu3h_sch_ep_info *sch_ep)
852 /* only release ep bw check passed by check_sch_bw() */
853 if (sch_ep->allocated)
854 load_ep_bw(sch_ep->bw_info, sch_ep, false);
859 list_del(&sch_ep->endpoint);
860 hlist_del(&sch_ep->hentry);
864 static bool need_bw_sch(struct usb_device *udev,
865 struct usb_host_endpoint *ep)
867 bool has_tt = udev->tt && udev->tt->hub->parent;
869 /* only for periodic endpoints */
870 if (usb_endpoint_xfer_control(&ep->desc)
871 || usb_endpoint_xfer_bulk(&ep->desc))
875 * for LS & FS periodic endpoints which its device is not behind
876 * a TT are also ignored, root-hub will schedule them directly,
877 * but need set @bpkts field of endpoint context to 1.
879 if (is_fs_or_ls(udev->speed) && !has_tt)
882 /* skip endpoint with zero maxpkt */
883 if (usb_endpoint_maxp(&ep->desc) == 0)
889 int xhci_mtk_sch_init(struct xhci_hcd_mtk *mtk)
891 struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
892 struct mu3h_sch_bw_info *sch_array;
895 /* ss IN and OUT are separated */
896 num_usb_bus = xhci->usb3_rhub.num_ports * 2 + xhci->usb2_rhub.num_ports;
898 sch_array = kcalloc(num_usb_bus, sizeof(*sch_array), GFP_KERNEL);
899 if (sch_array == NULL)
902 mtk->sch_array = sch_array;
904 INIT_LIST_HEAD(&mtk->bw_ep_chk_list);
905 hash_init(mtk->sch_ep_hash);
910 void xhci_mtk_sch_exit(struct xhci_hcd_mtk *mtk)
912 kfree(mtk->sch_array);
915 static int add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
916 struct usb_host_endpoint *ep)
918 struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
919 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
920 struct xhci_ep_ctx *ep_ctx;
921 struct xhci_virt_device *virt_dev;
922 struct mu3h_sch_ep_info *sch_ep;
923 unsigned int ep_index;
925 virt_dev = xhci->devs[udev->slot_id];
926 ep_index = xhci_get_endpoint_index(&ep->desc);
927 ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
929 if (!need_bw_sch(udev, ep)) {
931 * set @bpkts to 1 if it is LS or FS periodic endpoint, and its
932 * device does not connected through an external HS hub
934 if (usb_endpoint_xfer_int(&ep->desc)
935 || usb_endpoint_xfer_isoc(&ep->desc))
936 ep_ctx->reserved[0] = cpu_to_le32(EP_BPKTS(1));
941 xhci_dbg(xhci, "%s %s\n", __func__, decode_ep(ep, udev->speed));
943 sch_ep = create_sch_ep(mtk, udev, ep, ep_ctx);
944 if (IS_ERR_OR_NULL(sch_ep))
947 setup_sch_info(ep_ctx, sch_ep);
949 list_add_tail(&sch_ep->endpoint, &mtk->bw_ep_chk_list);
950 hash_add(mtk->sch_ep_hash, &sch_ep->hentry, (unsigned long)ep);
955 static void drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
956 struct usb_host_endpoint *ep)
958 struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
959 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
960 struct mu3h_sch_ep_info *sch_ep;
961 struct hlist_node *hn;
963 if (!need_bw_sch(udev, ep))
966 xhci_dbg(xhci, "%s %s\n", __func__, decode_ep(ep, udev->speed));
968 hash_for_each_possible_safe(mtk->sch_ep_hash, sch_ep,
969 hn, hentry, (unsigned long)ep) {
970 if (sch_ep->ep == ep) {
971 destroy_sch_ep(mtk, udev, sch_ep);
977 int xhci_mtk_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
979 struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
980 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
981 struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
982 struct mu3h_sch_ep_info *sch_ep;
985 xhci_dbg(xhci, "%s() udev %s\n", __func__, dev_name(&udev->dev));
987 list_for_each_entry(sch_ep, &mtk->bw_ep_chk_list, endpoint) {
988 struct xhci_ep_ctx *ep_ctx;
989 struct usb_host_endpoint *ep = sch_ep->ep;
990 unsigned int ep_index = xhci_get_endpoint_index(&ep->desc);
992 ret = check_sch_bw(sch_ep);
994 xhci_err(xhci, "Not enough bandwidth! (%s)\n",
995 sch_error_string(-ret));
999 ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
1000 ep_ctx->reserved[0] = cpu_to_le32(EP_BPKTS(sch_ep->pkts)
1001 | EP_BCSCOUNT(sch_ep->cs_count)
1002 | EP_BBM(sch_ep->burst_mode));
1003 ep_ctx->reserved[1] = cpu_to_le32(EP_BOFFSET(sch_ep->offset)
1004 | EP_BREPEAT(sch_ep->repeat));
1006 xhci_dbg(xhci, " PKTS:%x, CSCOUNT:%x, BM:%x, OFFSET:%x, REPEAT:%x\n",
1007 sch_ep->pkts, sch_ep->cs_count, sch_ep->burst_mode,
1008 sch_ep->offset, sch_ep->repeat);
1011 ret = xhci_check_bandwidth(hcd, udev);
1013 list_del_init(&mtk->bw_ep_chk_list);
1018 void xhci_mtk_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
1020 struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
1021 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1022 struct mu3h_sch_ep_info *sch_ep, *tmp;
1024 xhci_dbg(xhci, "%s() udev %s\n", __func__, dev_name(&udev->dev));
1026 list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_chk_list, endpoint)
1027 destroy_sch_ep(mtk, udev, sch_ep);
1029 xhci_reset_bandwidth(hcd, udev);
1032 int xhci_mtk_add_ep(struct usb_hcd *hcd, struct usb_device *udev,
1033 struct usb_host_endpoint *ep)
1037 ret = xhci_add_endpoint(hcd, udev, ep);
1042 ret = add_ep_quirk(hcd, udev, ep);
1047 int xhci_mtk_drop_ep(struct usb_hcd *hcd, struct usb_device *udev,
1048 struct usb_host_endpoint *ep)
1052 ret = xhci_drop_endpoint(hcd, udev, ep);
1056 /* needn't check @ep->hcpriv, xhci_endpoint_disable set it NULL */
1057 drop_ep_quirk(hcd, udev, ep);