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1// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
2/*
3 * hcd_ddma.c - DesignWare HS OTG Controller descriptor DMA routines
4 *
5 * Copyright (C) 2004-2013 Synopsys, Inc.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions, and the following disclaimer,
12 * without modification.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The names of the above-listed copyright holders may not be used
17 * to endorse or promote products derived from this software without
18 * specific prior written permission.
19 *
20 * ALTERNATIVELY, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") as published by the Free Software
22 * Foundation; either version 2 of the License, or (at your option) any
23 * later version.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
26 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
27 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
29 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
32 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38/*
39 * This file contains the Descriptor DMA implementation for Host mode
40 */
41#include <linux/kernel.h>
42#include <linux/module.h>
43#include <linux/spinlock.h>
44#include <linux/interrupt.h>
45#include <linux/dma-mapping.h>
46#include <linux/io.h>
47#include <linux/slab.h>
48#include <linux/usb.h>
49
50#include <linux/usb/hcd.h>
51#include <linux/usb/ch11.h>
52
53#include "core.h"
54#include "hcd.h"
55
56static u16 dwc2_frame_list_idx(u16 frame)
57{
58 return frame & (FRLISTEN_64_SIZE - 1);
59}
60
61static u16 dwc2_desclist_idx_inc(u16 idx, u16 inc, u8 speed)
62{
63 return (idx + inc) &
64 ((speed == USB_SPEED_HIGH ? MAX_DMA_DESC_NUM_HS_ISOC :
65 MAX_DMA_DESC_NUM_GENERIC) - 1);
66}
67
68static u16 dwc2_desclist_idx_dec(u16 idx, u16 inc, u8 speed)
69{
70 return (idx - inc) &
71 ((speed == USB_SPEED_HIGH ? MAX_DMA_DESC_NUM_HS_ISOC :
72 MAX_DMA_DESC_NUM_GENERIC) - 1);
73}
74
75static u16 dwc2_max_desc_num(struct dwc2_qh *qh)
76{
77 return (qh->ep_type == USB_ENDPOINT_XFER_ISOC &&
78 qh->dev_speed == USB_SPEED_HIGH) ?
79 MAX_DMA_DESC_NUM_HS_ISOC : MAX_DMA_DESC_NUM_GENERIC;
80}
81
82static u16 dwc2_frame_incr_val(struct dwc2_qh *qh)
83{
84 return qh->dev_speed == USB_SPEED_HIGH ?
85 (qh->host_interval + 8 - 1) / 8 : qh->host_interval;
86}
87
88static int dwc2_desc_list_alloc(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
89 gfp_t flags)
90{
91 struct kmem_cache *desc_cache;
92
93 if (qh->ep_type == USB_ENDPOINT_XFER_ISOC &&
94 qh->dev_speed == USB_SPEED_HIGH)
95 desc_cache = hsotg->desc_hsisoc_cache;
96 else
97 desc_cache = hsotg->desc_gen_cache;
98
99 qh->desc_list_sz = sizeof(struct dwc2_dma_desc) *
100 dwc2_max_desc_num(qh);
101
102 qh->desc_list = kmem_cache_zalloc(desc_cache, flags | GFP_DMA);
103 if (!qh->desc_list)
104 return -ENOMEM;
105
106 qh->desc_list_dma = dma_map_single(hsotg->dev, qh->desc_list,
107 qh->desc_list_sz,
108 DMA_TO_DEVICE);
109
110 qh->n_bytes = kcalloc(dwc2_max_desc_num(qh), sizeof(u32), flags);
111 if (!qh->n_bytes) {
112 dma_unmap_single(hsotg->dev, qh->desc_list_dma,
113 qh->desc_list_sz,
114 DMA_FROM_DEVICE);
115 kmem_cache_free(desc_cache, qh->desc_list);
116 qh->desc_list = NULL;
117 return -ENOMEM;
118 }
119
120 return 0;
121}
122
123static void dwc2_desc_list_free(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
124{
125 struct kmem_cache *desc_cache;
126
127 if (qh->ep_type == USB_ENDPOINT_XFER_ISOC &&
128 qh->dev_speed == USB_SPEED_HIGH)
129 desc_cache = hsotg->desc_hsisoc_cache;
130 else
131 desc_cache = hsotg->desc_gen_cache;
132
133 if (qh->desc_list) {
134 dma_unmap_single(hsotg->dev, qh->desc_list_dma,
135 qh->desc_list_sz, DMA_FROM_DEVICE);
136 kmem_cache_free(desc_cache, qh->desc_list);
137 qh->desc_list = NULL;
138 }
139
140 kfree(qh->n_bytes);
141 qh->n_bytes = NULL;
142}
143
144static int dwc2_frame_list_alloc(struct dwc2_hsotg *hsotg, gfp_t mem_flags)
145{
146 if (hsotg->frame_list)
147 return 0;
148
149 hsotg->frame_list_sz = 4 * FRLISTEN_64_SIZE;
150 hsotg->frame_list = kzalloc(hsotg->frame_list_sz, GFP_ATOMIC | GFP_DMA);
151 if (!hsotg->frame_list)
152 return -ENOMEM;
153
154 hsotg->frame_list_dma = dma_map_single(hsotg->dev, hsotg->frame_list,
155 hsotg->frame_list_sz,
156 DMA_TO_DEVICE);
157
158 return 0;
159}
160
161static void dwc2_frame_list_free(struct dwc2_hsotg *hsotg)
162{
163 unsigned long flags;
164
165 spin_lock_irqsave(&hsotg->lock, flags);
166
167 if (!hsotg->frame_list) {
168 spin_unlock_irqrestore(&hsotg->lock, flags);
169 return;
170 }
171
172 dma_unmap_single(hsotg->dev, hsotg->frame_list_dma,
173 hsotg->frame_list_sz, DMA_FROM_DEVICE);
174
175 kfree(hsotg->frame_list);
176 hsotg->frame_list = NULL;
177
178 spin_unlock_irqrestore(&hsotg->lock, flags);
179}
180
181static void dwc2_per_sched_enable(struct dwc2_hsotg *hsotg, u32 fr_list_en)
182{
183 u32 hcfg;
184 unsigned long flags;
185
186 spin_lock_irqsave(&hsotg->lock, flags);
187
188 hcfg = dwc2_readl(hsotg->regs + HCFG);
189 if (hcfg & HCFG_PERSCHEDENA) {
190 /* already enabled */
191 spin_unlock_irqrestore(&hsotg->lock, flags);
192 return;
193 }
194
195 dwc2_writel(hsotg->frame_list_dma, hsotg->regs + HFLBADDR);
196
197 hcfg &= ~HCFG_FRLISTEN_MASK;
198 hcfg |= fr_list_en | HCFG_PERSCHEDENA;
199 dev_vdbg(hsotg->dev, "Enabling Periodic schedule\n");
200 dwc2_writel(hcfg, hsotg->regs + HCFG);
201
202 spin_unlock_irqrestore(&hsotg->lock, flags);
203}
204
205static void dwc2_per_sched_disable(struct dwc2_hsotg *hsotg)
206{
207 u32 hcfg;
208 unsigned long flags;
209
210 spin_lock_irqsave(&hsotg->lock, flags);
211
212 hcfg = dwc2_readl(hsotg->regs + HCFG);
213 if (!(hcfg & HCFG_PERSCHEDENA)) {
214 /* already disabled */
215 spin_unlock_irqrestore(&hsotg->lock, flags);
216 return;
217 }
218
219 hcfg &= ~HCFG_PERSCHEDENA;
220 dev_vdbg(hsotg->dev, "Disabling Periodic schedule\n");
221 dwc2_writel(hcfg, hsotg->regs + HCFG);
222
223 spin_unlock_irqrestore(&hsotg->lock, flags);
224}
225
226/*
227 * Activates/Deactivates FrameList entries for the channel based on endpoint
228 * servicing period
229 */
230static void dwc2_update_frame_list(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
231 int enable)
232{
233 struct dwc2_host_chan *chan;
234 u16 i, j, inc;
235
236 if (!hsotg) {
237 pr_err("hsotg = %p\n", hsotg);
238 return;
239 }
240
241 if (!qh->channel) {
242 dev_err(hsotg->dev, "qh->channel = %p\n", qh->channel);
243 return;
244 }
245
246 if (!hsotg->frame_list) {
247 dev_err(hsotg->dev, "hsotg->frame_list = %p\n",
248 hsotg->frame_list);
249 return;
250 }
251
252 chan = qh->channel;
253 inc = dwc2_frame_incr_val(qh);
254 if (qh->ep_type == USB_ENDPOINT_XFER_ISOC)
255 i = dwc2_frame_list_idx(qh->next_active_frame);
256 else
257 i = 0;
258
259 j = i;
260 do {
261 if (enable)
262 hsotg->frame_list[j] |= 1 << chan->hc_num;
263 else
264 hsotg->frame_list[j] &= ~(1 << chan->hc_num);
265 j = (j + inc) & (FRLISTEN_64_SIZE - 1);
266 } while (j != i);
267
268 /*
269 * Sync frame list since controller will access it if periodic
270 * channel is currently enabled.
271 */
272 dma_sync_single_for_device(hsotg->dev,
273 hsotg->frame_list_dma,
274 hsotg->frame_list_sz,
275 DMA_TO_DEVICE);
276
277 if (!enable)
278 return;
279
280 chan->schinfo = 0;
281 if (chan->speed == USB_SPEED_HIGH && qh->host_interval) {
282 j = 1;
283 /* TODO - check this */
284 inc = (8 + qh->host_interval - 1) / qh->host_interval;
285 for (i = 0; i < inc; i++) {
286 chan->schinfo |= j;
287 j = j << qh->host_interval;
288 }
289 } else {
290 chan->schinfo = 0xff;
291 }
292}
293
294static void dwc2_release_channel_ddma(struct dwc2_hsotg *hsotg,
295 struct dwc2_qh *qh)
296{
297 struct dwc2_host_chan *chan = qh->channel;
298
299 if (dwc2_qh_is_non_per(qh)) {
300 if (hsotg->params.uframe_sched)
301 hsotg->available_host_channels++;
302 else
303 hsotg->non_periodic_channels--;
304 } else {
305 dwc2_update_frame_list(hsotg, qh, 0);
306 hsotg->available_host_channels++;
307 }
308
309 /*
310 * The condition is added to prevent double cleanup try in case of
311 * device disconnect. See channel cleanup in dwc2_hcd_disconnect().
312 */
313 if (chan->qh) {
314 if (!list_empty(&chan->hc_list_entry))
315 list_del(&chan->hc_list_entry);
316 dwc2_hc_cleanup(hsotg, chan);
317 list_add_tail(&chan->hc_list_entry, &hsotg->free_hc_list);
318 chan->qh = NULL;
319 }
320
321 qh->channel = NULL;
322 qh->ntd = 0;
323
324 if (qh->desc_list)
325 memset(qh->desc_list, 0, sizeof(struct dwc2_dma_desc) *
326 dwc2_max_desc_num(qh));
327}
328
329/**
330 * dwc2_hcd_qh_init_ddma() - Initializes a QH structure's Descriptor DMA
331 * related members
332 *
333 * @hsotg: The HCD state structure for the DWC OTG controller
334 * @qh: The QH to init
335 *
336 * Return: 0 if successful, negative error code otherwise
337 *
338 * Allocates memory for the descriptor list. For the first periodic QH,
339 * allocates memory for the FrameList and enables periodic scheduling.
340 */
341int dwc2_hcd_qh_init_ddma(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
342 gfp_t mem_flags)
343{
344 int retval;
345
346 if (qh->do_split) {
347 dev_err(hsotg->dev,
348 "SPLIT Transfers are not supported in Descriptor DMA mode.\n");
349 retval = -EINVAL;
350 goto err0;
351 }
352
353 retval = dwc2_desc_list_alloc(hsotg, qh, mem_flags);
354 if (retval)
355 goto err0;
356
357 if (qh->ep_type == USB_ENDPOINT_XFER_ISOC ||
358 qh->ep_type == USB_ENDPOINT_XFER_INT) {
359 if (!hsotg->frame_list) {
360 retval = dwc2_frame_list_alloc(hsotg, mem_flags);
361 if (retval)
362 goto err1;
363 /* Enable periodic schedule on first periodic QH */
364 dwc2_per_sched_enable(hsotg, HCFG_FRLISTEN_64);
365 }
366 }
367
368 qh->ntd = 0;
369 return 0;
370
371err1:
372 dwc2_desc_list_free(hsotg, qh);
373err0:
374 return retval;
375}
376
377/**
378 * dwc2_hcd_qh_free_ddma() - Frees a QH structure's Descriptor DMA related
379 * members
380 *
381 * @hsotg: The HCD state structure for the DWC OTG controller
382 * @qh: The QH to free
383 *
384 * Frees descriptor list memory associated with the QH. If QH is periodic and
385 * the last, frees FrameList memory and disables periodic scheduling.
386 */
387void dwc2_hcd_qh_free_ddma(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
388{
389 unsigned long flags;
390
391 dwc2_desc_list_free(hsotg, qh);
392
393 /*
394 * Channel still assigned due to some reasons.
395 * Seen on Isoc URB dequeue. Channel halted but no subsequent
396 * ChHalted interrupt to release the channel. Afterwards
397 * when it comes here from endpoint disable routine
398 * channel remains assigned.
399 */
400 spin_lock_irqsave(&hsotg->lock, flags);
401 if (qh->channel)
402 dwc2_release_channel_ddma(hsotg, qh);
403 spin_unlock_irqrestore(&hsotg->lock, flags);
404
405 if ((qh->ep_type == USB_ENDPOINT_XFER_ISOC ||
406 qh->ep_type == USB_ENDPOINT_XFER_INT) &&
407 (hsotg->params.uframe_sched ||
408 !hsotg->periodic_channels) && hsotg->frame_list) {
409 dwc2_per_sched_disable(hsotg);
410 dwc2_frame_list_free(hsotg);
411 }
412}
413
414static u8 dwc2_frame_to_desc_idx(struct dwc2_qh *qh, u16 frame_idx)
415{
416 if (qh->dev_speed == USB_SPEED_HIGH)
417 /* Descriptor set (8 descriptors) index which is 8-aligned */
418 return (frame_idx & ((MAX_DMA_DESC_NUM_HS_ISOC / 8) - 1)) * 8;
419 else
420 return frame_idx & (MAX_DMA_DESC_NUM_GENERIC - 1);
421}
422
423/*
424 * Determine starting frame for Isochronous transfer.
425 * Few frames skipped to prevent race condition with HC.
426 */
427static u16 dwc2_calc_starting_frame(struct dwc2_hsotg *hsotg,
428 struct dwc2_qh *qh, u16 *skip_frames)
429{
430 u16 frame;
431
432 hsotg->frame_number = dwc2_hcd_get_frame_number(hsotg);
433
434 /*
435 * next_active_frame is always frame number (not uFrame) both in FS
436 * and HS!
437 */
438
439 /*
440 * skip_frames is used to limit activated descriptors number
441 * to avoid the situation when HC services the last activated
442 * descriptor firstly.
443 * Example for FS:
444 * Current frame is 1, scheduled frame is 3. Since HC always fetches
445 * the descriptor corresponding to curr_frame+1, the descriptor
446 * corresponding to frame 2 will be fetched. If the number of
447 * descriptors is max=64 (or greather) the list will be fully programmed
448 * with Active descriptors and it is possible case (rare) that the
449 * latest descriptor(considering rollback) corresponding to frame 2 will
450 * be serviced first. HS case is more probable because, in fact, up to
451 * 11 uframes (16 in the code) may be skipped.
452 */
453 if (qh->dev_speed == USB_SPEED_HIGH) {
454 /*
455 * Consider uframe counter also, to start xfer asap. If half of
456 * the frame elapsed skip 2 frames otherwise just 1 frame.
457 * Starting descriptor index must be 8-aligned, so if the
458 * current frame is near to complete the next one is skipped as
459 * well.
460 */
461 if (dwc2_micro_frame_num(hsotg->frame_number) >= 5) {
462 *skip_frames = 2 * 8;
463 frame = dwc2_frame_num_inc(hsotg->frame_number,
464 *skip_frames);
465 } else {
466 *skip_frames = 1 * 8;
467 frame = dwc2_frame_num_inc(hsotg->frame_number,
468 *skip_frames);
469 }
470
471 frame = dwc2_full_frame_num(frame);
472 } else {
473 /*
474 * Two frames are skipped for FS - the current and the next.
475 * But for descriptor programming, 1 frame (descriptor) is
476 * enough, see example above.
477 */
478 *skip_frames = 1;
479 frame = dwc2_frame_num_inc(hsotg->frame_number, 2);
480 }
481
482 return frame;
483}
484
485/*
486 * Calculate initial descriptor index for isochronous transfer based on
487 * scheduled frame
488 */
489static u16 dwc2_recalc_initial_desc_idx(struct dwc2_hsotg *hsotg,
490 struct dwc2_qh *qh)
491{
492 u16 frame, fr_idx, fr_idx_tmp, skip_frames;
493
494 /*
495 * With current ISOC processing algorithm the channel is being released
496 * when no more QTDs in the list (qh->ntd == 0). Thus this function is
497 * called only when qh->ntd == 0 and qh->channel == 0.
498 *
499 * So qh->channel != NULL branch is not used and just not removed from
500 * the source file. It is required for another possible approach which
501 * is, do not disable and release the channel when ISOC session
502 * completed, just move QH to inactive schedule until new QTD arrives.
503 * On new QTD, the QH moved back to 'ready' schedule, starting frame and
504 * therefore starting desc_index are recalculated. In this case channel
505 * is released only on ep_disable.
506 */
507
508 /*
509 * Calculate starting descriptor index. For INTERRUPT endpoint it is
510 * always 0.
511 */
512 if (qh->channel) {
513 frame = dwc2_calc_starting_frame(hsotg, qh, &skip_frames);
514 /*
515 * Calculate initial descriptor index based on FrameList current
516 * bitmap and servicing period
517 */
518 fr_idx_tmp = dwc2_frame_list_idx(frame);
519 fr_idx = (FRLISTEN_64_SIZE +
520 dwc2_frame_list_idx(qh->next_active_frame) -
521 fr_idx_tmp) % dwc2_frame_incr_val(qh);
522 fr_idx = (fr_idx + fr_idx_tmp) % FRLISTEN_64_SIZE;
523 } else {
524 qh->next_active_frame = dwc2_calc_starting_frame(hsotg, qh,
525 &skip_frames);
526 fr_idx = dwc2_frame_list_idx(qh->next_active_frame);
527 }
528
529 qh->td_first = qh->td_last = dwc2_frame_to_desc_idx(qh, fr_idx);
530
531 return skip_frames;
532}
533
534#define ISOC_URB_GIVEBACK_ASAP
535
536#define MAX_ISOC_XFER_SIZE_FS 1023
537#define MAX_ISOC_XFER_SIZE_HS 3072
538#define DESCNUM_THRESHOLD 4
539
540static void dwc2_fill_host_isoc_dma_desc(struct dwc2_hsotg *hsotg,
541 struct dwc2_qtd *qtd,
542 struct dwc2_qh *qh, u32 max_xfer_size,
543 u16 idx)
544{
545 struct dwc2_dma_desc *dma_desc = &qh->desc_list[idx];
546 struct dwc2_hcd_iso_packet_desc *frame_desc;
547
548 memset(dma_desc, 0, sizeof(*dma_desc));
549 frame_desc = &qtd->urb->iso_descs[qtd->isoc_frame_index_last];
550
551 if (frame_desc->length > max_xfer_size)
552 qh->n_bytes[idx] = max_xfer_size;
553 else
554 qh->n_bytes[idx] = frame_desc->length;
555
556 dma_desc->buf = (u32)(qtd->urb->dma + frame_desc->offset);
557 dma_desc->status = qh->n_bytes[idx] << HOST_DMA_ISOC_NBYTES_SHIFT &
558 HOST_DMA_ISOC_NBYTES_MASK;
559
560 /* Set active bit */
561 dma_desc->status |= HOST_DMA_A;
562
563 qh->ntd++;
564 qtd->isoc_frame_index_last++;
565
566#ifdef ISOC_URB_GIVEBACK_ASAP
567 /* Set IOC for each descriptor corresponding to last frame of URB */
568 if (qtd->isoc_frame_index_last == qtd->urb->packet_count)
569 dma_desc->status |= HOST_DMA_IOC;
570#endif
571
572 dma_sync_single_for_device(hsotg->dev,
573 qh->desc_list_dma +
574 (idx * sizeof(struct dwc2_dma_desc)),
575 sizeof(struct dwc2_dma_desc),
576 DMA_TO_DEVICE);
577}
578
579static void dwc2_init_isoc_dma_desc(struct dwc2_hsotg *hsotg,
580 struct dwc2_qh *qh, u16 skip_frames)
581{
582 struct dwc2_qtd *qtd;
583 u32 max_xfer_size;
584 u16 idx, inc, n_desc = 0, ntd_max = 0;
585 u16 cur_idx;
586 u16 next_idx;
587
588 idx = qh->td_last;
589 inc = qh->host_interval;
590 hsotg->frame_number = dwc2_hcd_get_frame_number(hsotg);
591 cur_idx = dwc2_frame_list_idx(hsotg->frame_number);
592 next_idx = dwc2_desclist_idx_inc(qh->td_last, inc, qh->dev_speed);
593
594 /*
595 * Ensure current frame number didn't overstep last scheduled
596 * descriptor. If it happens, the only way to recover is to move
597 * qh->td_last to current frame number + 1.
598 * So that next isoc descriptor will be scheduled on frame number + 1
599 * and not on a past frame.
600 */
601 if (dwc2_frame_idx_num_gt(cur_idx, next_idx) || (cur_idx == next_idx)) {
602 if (inc < 32) {
603 dev_vdbg(hsotg->dev,
604 "current frame number overstep last descriptor\n");
605 qh->td_last = dwc2_desclist_idx_inc(cur_idx, inc,
606 qh->dev_speed);
607 idx = qh->td_last;
608 }
609 }
610
611 if (qh->host_interval) {
612 ntd_max = (dwc2_max_desc_num(qh) + qh->host_interval - 1) /
613 qh->host_interval;
614 if (skip_frames && !qh->channel)
615 ntd_max -= skip_frames / qh->host_interval;
616 }
617
618 max_xfer_size = qh->dev_speed == USB_SPEED_HIGH ?
619 MAX_ISOC_XFER_SIZE_HS : MAX_ISOC_XFER_SIZE_FS;
620
621 list_for_each_entry(qtd, &qh->qtd_list, qtd_list_entry) {
622 if (qtd->in_process &&
623 qtd->isoc_frame_index_last ==
624 qtd->urb->packet_count)
625 continue;
626
627 qtd->isoc_td_first = idx;
628 while (qh->ntd < ntd_max && qtd->isoc_frame_index_last <
629 qtd->urb->packet_count) {
630 dwc2_fill_host_isoc_dma_desc(hsotg, qtd, qh,
631 max_xfer_size, idx);
632 idx = dwc2_desclist_idx_inc(idx, inc, qh->dev_speed);
633 n_desc++;
634 }
635 qtd->isoc_td_last = idx;
636 qtd->in_process = 1;
637 }
638
639 qh->td_last = idx;
640
641#ifdef ISOC_URB_GIVEBACK_ASAP
642 /* Set IOC for last descriptor if descriptor list is full */
643 if (qh->ntd == ntd_max) {
644 idx = dwc2_desclist_idx_dec(qh->td_last, inc, qh->dev_speed);
645 qh->desc_list[idx].status |= HOST_DMA_IOC;
646 dma_sync_single_for_device(hsotg->dev,
647 qh->desc_list_dma + (idx *
648 sizeof(struct dwc2_dma_desc)),
649 sizeof(struct dwc2_dma_desc),
650 DMA_TO_DEVICE);
651 }
652#else
653 /*
654 * Set IOC bit only for one descriptor. Always try to be ahead of HW
655 * processing, i.e. on IOC generation driver activates next descriptor
656 * but core continues to process descriptors following the one with IOC
657 * set.
658 */
659
660 if (n_desc > DESCNUM_THRESHOLD)
661 /*
662 * Move IOC "up". Required even if there is only one QTD
663 * in the list, because QTDs might continue to be queued,
664 * but during the activation it was only one queued.
665 * Actually more than one QTD might be in the list if this
666 * function called from XferCompletion - QTDs was queued during
667 * HW processing of the previous descriptor chunk.
668 */
669 idx = dwc2_desclist_idx_dec(idx, inc * ((qh->ntd + 1) / 2),
670 qh->dev_speed);
671 else
672 /*
673 * Set the IOC for the latest descriptor if either number of
674 * descriptors is not greater than threshold or no more new
675 * descriptors activated
676 */
677 idx = dwc2_desclist_idx_dec(qh->td_last, inc, qh->dev_speed);
678
679 qh->desc_list[idx].status |= HOST_DMA_IOC;
680 dma_sync_single_for_device(hsotg->dev,
681 qh->desc_list_dma +
682 (idx * sizeof(struct dwc2_dma_desc)),
683 sizeof(struct dwc2_dma_desc),
684 DMA_TO_DEVICE);
685#endif
686}
687
688static void dwc2_fill_host_dma_desc(struct dwc2_hsotg *hsotg,
689 struct dwc2_host_chan *chan,
690 struct dwc2_qtd *qtd, struct dwc2_qh *qh,
691 int n_desc)
692{
693 struct dwc2_dma_desc *dma_desc = &qh->desc_list[n_desc];
694 int len = chan->xfer_len;
695
696 if (len > HOST_DMA_NBYTES_LIMIT - (chan->max_packet - 1))
697 len = HOST_DMA_NBYTES_LIMIT - (chan->max_packet - 1);
698
699 if (chan->ep_is_in) {
700 int num_packets;
701
702 if (len > 0 && chan->max_packet)
703 num_packets = (len + chan->max_packet - 1)
704 / chan->max_packet;
705 else
706 /* Need 1 packet for transfer length of 0 */
707 num_packets = 1;
708
709 /* Always program an integral # of packets for IN transfers */
710 len = num_packets * chan->max_packet;
711 }
712
713 dma_desc->status = len << HOST_DMA_NBYTES_SHIFT & HOST_DMA_NBYTES_MASK;
714 qh->n_bytes[n_desc] = len;
715
716 if (qh->ep_type == USB_ENDPOINT_XFER_CONTROL &&
717 qtd->control_phase == DWC2_CONTROL_SETUP)
718 dma_desc->status |= HOST_DMA_SUP;
719
720 dma_desc->buf = (u32)chan->xfer_dma;
721
722 dma_sync_single_for_device(hsotg->dev,
723 qh->desc_list_dma +
724 (n_desc * sizeof(struct dwc2_dma_desc)),
725 sizeof(struct dwc2_dma_desc),
726 DMA_TO_DEVICE);
727
728 /*
729 * Last (or only) descriptor of IN transfer with actual size less
730 * than MaxPacket
731 */
732 if (len > chan->xfer_len) {
733 chan->xfer_len = 0;
734 } else {
735 chan->xfer_dma += len;
736 chan->xfer_len -= len;
737 }
738}
739
740static void dwc2_init_non_isoc_dma_desc(struct dwc2_hsotg *hsotg,
741 struct dwc2_qh *qh)
742{
743 struct dwc2_qtd *qtd;
744 struct dwc2_host_chan *chan = qh->channel;
745 int n_desc = 0;
746
747 dev_vdbg(hsotg->dev, "%s(): qh=%p dma=%08lx len=%d\n", __func__, qh,
748 (unsigned long)chan->xfer_dma, chan->xfer_len);
749
750 /*
751 * Start with chan->xfer_dma initialized in assign_and_init_hc(), then
752 * if SG transfer consists of multiple URBs, this pointer is re-assigned
753 * to the buffer of the currently processed QTD. For non-SG request
754 * there is always one QTD active.
755 */
756
757 list_for_each_entry(qtd, &qh->qtd_list, qtd_list_entry) {
758 dev_vdbg(hsotg->dev, "qtd=%p\n", qtd);
759
760 if (n_desc) {
761 /* SG request - more than 1 QTD */
762 chan->xfer_dma = qtd->urb->dma +
763 qtd->urb->actual_length;
764 chan->xfer_len = qtd->urb->length -
765 qtd->urb->actual_length;
766 dev_vdbg(hsotg->dev, "buf=%08lx len=%d\n",
767 (unsigned long)chan->xfer_dma, chan->xfer_len);
768 }
769
770 qtd->n_desc = 0;
771 do {
772 if (n_desc > 1) {
773 qh->desc_list[n_desc - 1].status |= HOST_DMA_A;
774 dev_vdbg(hsotg->dev,
775 "set A bit in desc %d (%p)\n",
776 n_desc - 1,
777 &qh->desc_list[n_desc - 1]);
778 dma_sync_single_for_device(hsotg->dev,
779 qh->desc_list_dma +
780 ((n_desc - 1) *
781 sizeof(struct dwc2_dma_desc)),
782 sizeof(struct dwc2_dma_desc),
783 DMA_TO_DEVICE);
784 }
785 dwc2_fill_host_dma_desc(hsotg, chan, qtd, qh, n_desc);
786 dev_vdbg(hsotg->dev,
787 "desc %d (%p) buf=%08x status=%08x\n",
788 n_desc, &qh->desc_list[n_desc],
789 qh->desc_list[n_desc].buf,
790 qh->desc_list[n_desc].status);
791 qtd->n_desc++;
792 n_desc++;
793 } while (chan->xfer_len > 0 &&
794 n_desc != MAX_DMA_DESC_NUM_GENERIC);
795
796 dev_vdbg(hsotg->dev, "n_desc=%d\n", n_desc);
797 qtd->in_process = 1;
798 if (qh->ep_type == USB_ENDPOINT_XFER_CONTROL)
799 break;
800 if (n_desc == MAX_DMA_DESC_NUM_GENERIC)
801 break;
802 }
803
804 if (n_desc) {
805 qh->desc_list[n_desc - 1].status |=
806 HOST_DMA_IOC | HOST_DMA_EOL | HOST_DMA_A;
807 dev_vdbg(hsotg->dev, "set IOC/EOL/A bits in desc %d (%p)\n",
808 n_desc - 1, &qh->desc_list[n_desc - 1]);
809 dma_sync_single_for_device(hsotg->dev,
810 qh->desc_list_dma + (n_desc - 1) *
811 sizeof(struct dwc2_dma_desc),
812 sizeof(struct dwc2_dma_desc),
813 DMA_TO_DEVICE);
814 if (n_desc > 1) {
815 qh->desc_list[0].status |= HOST_DMA_A;
816 dev_vdbg(hsotg->dev, "set A bit in desc 0 (%p)\n",
817 &qh->desc_list[0]);
818 dma_sync_single_for_device(hsotg->dev,
819 qh->desc_list_dma,
820 sizeof(struct dwc2_dma_desc),
821 DMA_TO_DEVICE);
822 }
823 chan->ntd = n_desc;
824 }
825}
826
827/**
828 * dwc2_hcd_start_xfer_ddma() - Starts a transfer in Descriptor DMA mode
829 *
830 * @hsotg: The HCD state structure for the DWC OTG controller
831 * @qh: The QH to init
832 *
833 * Return: 0 if successful, negative error code otherwise
834 *
835 * For Control and Bulk endpoints, initializes descriptor list and starts the
836 * transfer. For Interrupt and Isochronous endpoints, initializes descriptor
837 * list then updates FrameList, marking appropriate entries as active.
838 *
839 * For Isochronous endpoints the starting descriptor index is calculated based
840 * on the scheduled frame, but only on the first transfer descriptor within a
841 * session. Then the transfer is started via enabling the channel.
842 *
843 * For Isochronous endpoints the channel is not halted on XferComplete
844 * interrupt so remains assigned to the endpoint(QH) until session is done.
845 */
846void dwc2_hcd_start_xfer_ddma(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
847{
848 /* Channel is already assigned */
849 struct dwc2_host_chan *chan = qh->channel;
850 u16 skip_frames = 0;
851
852 switch (chan->ep_type) {
853 case USB_ENDPOINT_XFER_CONTROL:
854 case USB_ENDPOINT_XFER_BULK:
855 dwc2_init_non_isoc_dma_desc(hsotg, qh);
856 dwc2_hc_start_transfer_ddma(hsotg, chan);
857 break;
858 case USB_ENDPOINT_XFER_INT:
859 dwc2_init_non_isoc_dma_desc(hsotg, qh);
860 dwc2_update_frame_list(hsotg, qh, 1);
861 dwc2_hc_start_transfer_ddma(hsotg, chan);
862 break;
863 case USB_ENDPOINT_XFER_ISOC:
864 if (!qh->ntd)
865 skip_frames = dwc2_recalc_initial_desc_idx(hsotg, qh);
866 dwc2_init_isoc_dma_desc(hsotg, qh, skip_frames);
867
868 if (!chan->xfer_started) {
869 dwc2_update_frame_list(hsotg, qh, 1);
870
871 /*
872 * Always set to max, instead of actual size. Otherwise
873 * ntd will be changed with channel being enabled. Not
874 * recommended.
875 */
876 chan->ntd = dwc2_max_desc_num(qh);
877
878 /* Enable channel only once for ISOC */
879 dwc2_hc_start_transfer_ddma(hsotg, chan);
880 }
881
882 break;
883 default:
884 break;
885 }
886}
887
888#define DWC2_CMPL_DONE 1
889#define DWC2_CMPL_STOP 2
890
891static int dwc2_cmpl_host_isoc_dma_desc(struct dwc2_hsotg *hsotg,
892 struct dwc2_host_chan *chan,
893 struct dwc2_qtd *qtd,
894 struct dwc2_qh *qh, u16 idx)
895{
896 struct dwc2_dma_desc *dma_desc;
897 struct dwc2_hcd_iso_packet_desc *frame_desc;
898 u16 remain = 0;
899 int rc = 0;
900
901 if (!qtd->urb)
902 return -EINVAL;
903
904 dma_sync_single_for_cpu(hsotg->dev, qh->desc_list_dma + (idx *
905 sizeof(struct dwc2_dma_desc)),
906 sizeof(struct dwc2_dma_desc),
907 DMA_FROM_DEVICE);
908
909 dma_desc = &qh->desc_list[idx];
910
911 frame_desc = &qtd->urb->iso_descs[qtd->isoc_frame_index_last];
912 dma_desc->buf = (u32)(qtd->urb->dma + frame_desc->offset);
913 if (chan->ep_is_in)
914 remain = (dma_desc->status & HOST_DMA_ISOC_NBYTES_MASK) >>
915 HOST_DMA_ISOC_NBYTES_SHIFT;
916
917 if ((dma_desc->status & HOST_DMA_STS_MASK) == HOST_DMA_STS_PKTERR) {
918 /*
919 * XactError, or unable to complete all the transactions
920 * in the scheduled micro-frame/frame, both indicated by
921 * HOST_DMA_STS_PKTERR
922 */
923 qtd->urb->error_count++;
924 frame_desc->actual_length = qh->n_bytes[idx] - remain;
925 frame_desc->status = -EPROTO;
926 } else {
927 /* Success */
928 frame_desc->actual_length = qh->n_bytes[idx] - remain;
929 frame_desc->status = 0;
930 }
931
932 if (++qtd->isoc_frame_index == qtd->urb->packet_count) {
933 /*
934 * urb->status is not used for isoc transfers here. The
935 * individual frame_desc status are used instead.
936 */
937 dwc2_host_complete(hsotg, qtd, 0);
938 dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
939
940 /*
941 * This check is necessary because urb_dequeue can be called
942 * from urb complete callback (sound driver for example). All
943 * pending URBs are dequeued there, so no need for further
944 * processing.
945 */
946 if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE)
947 return -1;
948 rc = DWC2_CMPL_DONE;
949 }
950
951 qh->ntd--;
952
953 /* Stop if IOC requested descriptor reached */
954 if (dma_desc->status & HOST_DMA_IOC)
955 rc = DWC2_CMPL_STOP;
956
957 return rc;
958}
959
960static void dwc2_complete_isoc_xfer_ddma(struct dwc2_hsotg *hsotg,
961 struct dwc2_host_chan *chan,
962 enum dwc2_halt_status halt_status)
963{
964 struct dwc2_hcd_iso_packet_desc *frame_desc;
965 struct dwc2_qtd *qtd, *qtd_tmp;
966 struct dwc2_qh *qh;
967 u16 idx;
968 int rc;
969
970 qh = chan->qh;
971 idx = qh->td_first;
972
973 if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE) {
974 list_for_each_entry(qtd, &qh->qtd_list, qtd_list_entry)
975 qtd->in_process = 0;
976 return;
977 }
978
979 if (halt_status == DWC2_HC_XFER_AHB_ERR ||
980 halt_status == DWC2_HC_XFER_BABBLE_ERR) {
981 /*
982 * Channel is halted in these error cases, considered as serious
983 * issues.
984 * Complete all URBs marking all frames as failed, irrespective
985 * whether some of the descriptors (frames) succeeded or not.
986 * Pass error code to completion routine as well, to update
987 * urb->status, some of class drivers might use it to stop
988 * queing transfer requests.
989 */
990 int err = halt_status == DWC2_HC_XFER_AHB_ERR ?
991 -EIO : -EOVERFLOW;
992
993 list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
994 qtd_list_entry) {
995 if (qtd->urb) {
996 for (idx = 0; idx < qtd->urb->packet_count;
997 idx++) {
998 frame_desc = &qtd->urb->iso_descs[idx];
999 frame_desc->status = err;
1000 }
1001
1002 dwc2_host_complete(hsotg, qtd, err);
1003 }
1004
1005 dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
1006 }
1007
1008 return;
1009 }
1010
1011 list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list, qtd_list_entry) {
1012 if (!qtd->in_process)
1013 break;
1014
1015 /*
1016 * Ensure idx corresponds to descriptor where first urb of this
1017 * qtd was added. In fact, during isoc desc init, dwc2 may skip
1018 * an index if current frame number is already over this index.
1019 */
1020 if (idx != qtd->isoc_td_first) {
1021 dev_vdbg(hsotg->dev,
1022 "try to complete %d instead of %d\n",
1023 idx, qtd->isoc_td_first);
1024 idx = qtd->isoc_td_first;
1025 }
1026
1027 do {
1028 struct dwc2_qtd *qtd_next;
1029 u16 cur_idx;
1030
1031 rc = dwc2_cmpl_host_isoc_dma_desc(hsotg, chan, qtd, qh,
1032 idx);
1033 if (rc < 0)
1034 return;
1035 idx = dwc2_desclist_idx_inc(idx, qh->host_interval,
1036 chan->speed);
1037 if (!rc)
1038 continue;
1039
1040 if (rc == DWC2_CMPL_DONE)
1041 break;
1042
1043 /* rc == DWC2_CMPL_STOP */
1044
1045 if (qh->host_interval >= 32)
1046 goto stop_scan;
1047
1048 qh->td_first = idx;
1049 cur_idx = dwc2_frame_list_idx(hsotg->frame_number);
1050 qtd_next = list_first_entry(&qh->qtd_list,
1051 struct dwc2_qtd,
1052 qtd_list_entry);
1053 if (dwc2_frame_idx_num_gt(cur_idx,
1054 qtd_next->isoc_td_last))
1055 break;
1056
1057 goto stop_scan;
1058
1059 } while (idx != qh->td_first);
1060 }
1061
1062stop_scan:
1063 qh->td_first = idx;
1064}
1065
1066static int dwc2_update_non_isoc_urb_state_ddma(struct dwc2_hsotg *hsotg,
1067 struct dwc2_host_chan *chan,
1068 struct dwc2_qtd *qtd,
1069 struct dwc2_dma_desc *dma_desc,
1070 enum dwc2_halt_status halt_status,
1071 u32 n_bytes, int *xfer_done)
1072{
1073 struct dwc2_hcd_urb *urb = qtd->urb;
1074 u16 remain = 0;
1075
1076 if (chan->ep_is_in)
1077 remain = (dma_desc->status & HOST_DMA_NBYTES_MASK) >>
1078 HOST_DMA_NBYTES_SHIFT;
1079
1080 dev_vdbg(hsotg->dev, "remain=%d dwc2_urb=%p\n", remain, urb);
1081
1082 if (halt_status == DWC2_HC_XFER_AHB_ERR) {
1083 dev_err(hsotg->dev, "EIO\n");
1084 urb->status = -EIO;
1085 return 1;
1086 }
1087
1088 if ((dma_desc->status & HOST_DMA_STS_MASK) == HOST_DMA_STS_PKTERR) {
1089 switch (halt_status) {
1090 case DWC2_HC_XFER_STALL:
1091 dev_vdbg(hsotg->dev, "Stall\n");
1092 urb->status = -EPIPE;
1093 break;
1094 case DWC2_HC_XFER_BABBLE_ERR:
1095 dev_err(hsotg->dev, "Babble\n");
1096 urb->status = -EOVERFLOW;
1097 break;
1098 case DWC2_HC_XFER_XACT_ERR:
1099 dev_err(hsotg->dev, "XactErr\n");
1100 urb->status = -EPROTO;
1101 break;
1102 default:
1103 dev_err(hsotg->dev,
1104 "%s: Unhandled descriptor error status (%d)\n",
1105 __func__, halt_status);
1106 break;
1107 }
1108 return 1;
1109 }
1110
1111 if (dma_desc->status & HOST_DMA_A) {
1112 dev_vdbg(hsotg->dev,
1113 "Active descriptor encountered on channel %d\n",
1114 chan->hc_num);
1115 return 0;
1116 }
1117
1118 if (chan->ep_type == USB_ENDPOINT_XFER_CONTROL) {
1119 if (qtd->control_phase == DWC2_CONTROL_DATA) {
1120 urb->actual_length += n_bytes - remain;
1121 if (remain || urb->actual_length >= urb->length) {
1122 /*
1123 * For Control Data stage do not set urb->status
1124 * to 0, to prevent URB callback. Set it when
1125 * Status phase is done. See below.
1126 */
1127 *xfer_done = 1;
1128 }
1129 } else if (qtd->control_phase == DWC2_CONTROL_STATUS) {
1130 urb->status = 0;
1131 *xfer_done = 1;
1132 }
1133 /* No handling for SETUP stage */
1134 } else {
1135 /* BULK and INTR */
1136 urb->actual_length += n_bytes - remain;
1137 dev_vdbg(hsotg->dev, "length=%d actual=%d\n", urb->length,
1138 urb->actual_length);
1139 if (remain || urb->actual_length >= urb->length) {
1140 urb->status = 0;
1141 *xfer_done = 1;
1142 }
1143 }
1144
1145 return 0;
1146}
1147
1148static int dwc2_process_non_isoc_desc(struct dwc2_hsotg *hsotg,
1149 struct dwc2_host_chan *chan,
1150 int chnum, struct dwc2_qtd *qtd,
1151 int desc_num,
1152 enum dwc2_halt_status halt_status,
1153 int *xfer_done)
1154{
1155 struct dwc2_qh *qh = chan->qh;
1156 struct dwc2_hcd_urb *urb = qtd->urb;
1157 struct dwc2_dma_desc *dma_desc;
1158 u32 n_bytes;
1159 int failed;
1160
1161 dev_vdbg(hsotg->dev, "%s()\n", __func__);
1162
1163 if (!urb)
1164 return -EINVAL;
1165
1166 dma_sync_single_for_cpu(hsotg->dev,
1167 qh->desc_list_dma + (desc_num *
1168 sizeof(struct dwc2_dma_desc)),
1169 sizeof(struct dwc2_dma_desc),
1170 DMA_FROM_DEVICE);
1171
1172 dma_desc = &qh->desc_list[desc_num];
1173 n_bytes = qh->n_bytes[desc_num];
1174 dev_vdbg(hsotg->dev,
1175 "qtd=%p dwc2_urb=%p desc_num=%d desc=%p n_bytes=%d\n",
1176 qtd, urb, desc_num, dma_desc, n_bytes);
1177 failed = dwc2_update_non_isoc_urb_state_ddma(hsotg, chan, qtd, dma_desc,
1178 halt_status, n_bytes,
1179 xfer_done);
1180 if (failed || (*xfer_done && urb->status != -EINPROGRESS)) {
1181 dwc2_host_complete(hsotg, qtd, urb->status);
1182 dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
1183 dev_vdbg(hsotg->dev, "failed=%1x xfer_done=%1x\n",
1184 failed, *xfer_done);
1185 return failed;
1186 }
1187
1188 if (qh->ep_type == USB_ENDPOINT_XFER_CONTROL) {
1189 switch (qtd->control_phase) {
1190 case DWC2_CONTROL_SETUP:
1191 if (urb->length > 0)
1192 qtd->control_phase = DWC2_CONTROL_DATA;
1193 else
1194 qtd->control_phase = DWC2_CONTROL_STATUS;
1195 dev_vdbg(hsotg->dev,
1196 " Control setup transaction done\n");
1197 break;
1198 case DWC2_CONTROL_DATA:
1199 if (*xfer_done) {
1200 qtd->control_phase = DWC2_CONTROL_STATUS;
1201 dev_vdbg(hsotg->dev,
1202 " Control data transfer done\n");
1203 } else if (desc_num + 1 == qtd->n_desc) {
1204 /*
1205 * Last descriptor for Control data stage which
1206 * is not completed yet
1207 */
1208 dwc2_hcd_save_data_toggle(hsotg, chan, chnum,
1209 qtd);
1210 }
1211 break;
1212 default:
1213 break;
1214 }
1215 }
1216
1217 return 0;
1218}
1219
1220static void dwc2_complete_non_isoc_xfer_ddma(struct dwc2_hsotg *hsotg,
1221 struct dwc2_host_chan *chan,
1222 int chnum,
1223 enum dwc2_halt_status halt_status)
1224{
1225 struct list_head *qtd_item, *qtd_tmp;
1226 struct dwc2_qh *qh = chan->qh;
1227 struct dwc2_qtd *qtd = NULL;
1228 int xfer_done;
1229 int desc_num = 0;
1230
1231 if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE) {
1232 list_for_each_entry(qtd, &qh->qtd_list, qtd_list_entry)
1233 qtd->in_process = 0;
1234 return;
1235 }
1236
1237 list_for_each_safe(qtd_item, qtd_tmp, &qh->qtd_list) {
1238 int i;
1239 int qtd_desc_count;
1240
1241 qtd = list_entry(qtd_item, struct dwc2_qtd, qtd_list_entry);
1242 xfer_done = 0;
1243 qtd_desc_count = qtd->n_desc;
1244
1245 for (i = 0; i < qtd_desc_count; i++) {
1246 if (dwc2_process_non_isoc_desc(hsotg, chan, chnum, qtd,
1247 desc_num, halt_status,
1248 &xfer_done)) {
1249 qtd = NULL;
1250 goto stop_scan;
1251 }
1252
1253 desc_num++;
1254 }
1255 }
1256
1257stop_scan:
1258 if (qh->ep_type != USB_ENDPOINT_XFER_CONTROL) {
1259 /*
1260 * Resetting the data toggle for bulk and interrupt endpoints
1261 * in case of stall. See handle_hc_stall_intr().
1262 */
1263 if (halt_status == DWC2_HC_XFER_STALL)
1264 qh->data_toggle = DWC2_HC_PID_DATA0;
1265 else
1266 dwc2_hcd_save_data_toggle(hsotg, chan, chnum, NULL);
1267 }
1268
1269 if (halt_status == DWC2_HC_XFER_COMPLETE) {
1270 if (chan->hcint & HCINTMSK_NYET) {
1271 /*
1272 * Got a NYET on the last transaction of the transfer.
1273 * It means that the endpoint should be in the PING
1274 * state at the beginning of the next transfer.
1275 */
1276 qh->ping_state = 1;
1277 }
1278 }
1279}
1280
1281/**
1282 * dwc2_hcd_complete_xfer_ddma() - Scans the descriptor list, updates URB's
1283 * status and calls completion routine for the URB if it's done. Called from
1284 * interrupt handlers.
1285 *
1286 * @hsotg: The HCD state structure for the DWC OTG controller
1287 * @chan: Host channel the transfer is completed on
1288 * @chnum: Index of Host channel registers
1289 * @halt_status: Reason the channel is being halted or just XferComplete
1290 * for isochronous transfers
1291 *
1292 * Releases the channel to be used by other transfers.
1293 * In case of Isochronous endpoint the channel is not halted until the end of
1294 * the session, i.e. QTD list is empty.
1295 * If periodic channel released the FrameList is updated accordingly.
1296 * Calls transaction selection routines to activate pending transfers.
1297 */
1298void dwc2_hcd_complete_xfer_ddma(struct dwc2_hsotg *hsotg,
1299 struct dwc2_host_chan *chan, int chnum,
1300 enum dwc2_halt_status halt_status)
1301{
1302 struct dwc2_qh *qh = chan->qh;
1303 int continue_isoc_xfer = 0;
1304 enum dwc2_transaction_type tr_type;
1305
1306 if (chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
1307 dwc2_complete_isoc_xfer_ddma(hsotg, chan, halt_status);
1308
1309 /* Release the channel if halted or session completed */
1310 if (halt_status != DWC2_HC_XFER_COMPLETE ||
1311 list_empty(&qh->qtd_list)) {
1312 struct dwc2_qtd *qtd, *qtd_tmp;
1313
1314 /*
1315 * Kill all remainings QTDs since channel has been
1316 * halted.
1317 */
1318 list_for_each_entry_safe(qtd, qtd_tmp,
1319 &qh->qtd_list,
1320 qtd_list_entry) {
1321 dwc2_host_complete(hsotg, qtd,
1322 -ECONNRESET);
1323 dwc2_hcd_qtd_unlink_and_free(hsotg,
1324 qtd, qh);
1325 }
1326
1327 /* Halt the channel if session completed */
1328 if (halt_status == DWC2_HC_XFER_COMPLETE)
1329 dwc2_hc_halt(hsotg, chan, halt_status);
1330 dwc2_release_channel_ddma(hsotg, qh);
1331 dwc2_hcd_qh_unlink(hsotg, qh);
1332 } else {
1333 /* Keep in assigned schedule to continue transfer */
1334 list_move_tail(&qh->qh_list_entry,
1335 &hsotg->periodic_sched_assigned);
1336 /*
1337 * If channel has been halted during giveback of urb
1338 * then prevent any new scheduling.
1339 */
1340 if (!chan->halt_status)
1341 continue_isoc_xfer = 1;
1342 }
1343 /*
1344 * Todo: Consider the case when period exceeds FrameList size.
1345 * Frame Rollover interrupt should be used.
1346 */
1347 } else {
1348 /*
1349 * Scan descriptor list to complete the URB(s), then release
1350 * the channel
1351 */
1352 dwc2_complete_non_isoc_xfer_ddma(hsotg, chan, chnum,
1353 halt_status);
1354 dwc2_release_channel_ddma(hsotg, qh);
1355 dwc2_hcd_qh_unlink(hsotg, qh);
1356
1357 if (!list_empty(&qh->qtd_list)) {
1358 /*
1359 * Add back to inactive non-periodic schedule on normal
1360 * completion
1361 */
1362 dwc2_hcd_qh_add(hsotg, qh);
1363 }
1364 }
1365
1366 tr_type = dwc2_hcd_select_transactions(hsotg);
1367 if (tr_type != DWC2_TRANSACTION_NONE || continue_isoc_xfer) {
1368 if (continue_isoc_xfer) {
1369 if (tr_type == DWC2_TRANSACTION_NONE)
1370 tr_type = DWC2_TRANSACTION_PERIODIC;
1371 else if (tr_type == DWC2_TRANSACTION_NON_PERIODIC)
1372 tr_type = DWC2_TRANSACTION_ALL;
1373 }
1374 dwc2_hcd_queue_transactions(hsotg, tr_type);
1375 }
1376}