3 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/stdint.h>
28 #include <sys/stddef.h>
29 #include <sys/param.h>
30 #include <sys/queue.h>
31 #include <sys/types.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
35 #include <sys/module.h>
37 #include <sys/mutex.h>
38 #include <sys/condvar.h>
39 #include <sys/sysctl.h>
41 #include <sys/unistd.h>
42 #include <sys/callout.h>
43 #include <sys/malloc.h>
46 #include <dev/usb/usb.h>
47 #include <dev/usb/usbdi.h>
48 #include <dev/usb/usbdi_util.h>
50 #define USB_DEBUG_VAR usb_debug
52 #include <dev/usb/usb_core.h>
53 #include <dev/usb/usb_busdma.h>
54 #include <dev/usb/usb_process.h>
55 #include <dev/usb/usb_transfer.h>
56 #include <dev/usb/usb_device.h>
57 #include <dev/usb/usb_util.h>
58 #include <dev/usb/usb_debug.h>
60 #include <dev/usb/usb_controller.h>
61 #include <dev/usb/usb_bus.h>
64 static void usb_dma_tag_create(struct usb_dma_tag *, usb_size_t, usb_size_t);
65 static void usb_dma_tag_destroy(struct usb_dma_tag *);
66 static void usb_dma_lock_cb(void *, bus_dma_lock_op_t);
67 static void usb_pc_alloc_mem_cb(void *, bus_dma_segment_t *, int, int);
68 static void usb_pc_load_mem_cb(void *, bus_dma_segment_t *, int, int);
69 static void usb_pc_common_mem_cb(void *, bus_dma_segment_t *, int, int,
73 /*------------------------------------------------------------------------*
74 * usbd_get_page - lookup DMA-able memory for the given offset
76 * NOTE: Only call this function when the "page_cache" structure has
77 * been properly initialized !
78 *------------------------------------------------------------------------*/
80 usbd_get_page(struct usb_page_cache *pc, usb_frlength_t offset,
81 struct usb_page_search *res)
84 struct usb_page *page;
88 /* Case 1 - something has been loaded into DMA */
92 /* Case 1a - Kernel Virtual Address */
94 res->buffer = USB_ADD_BYTES(pc->buffer, offset);
96 offset += pc->page_offset_buf;
98 /* compute destination page */
100 page = pc->page_start;
102 if (pc->ismultiseg) {
104 page += (offset / USB_PAGE_SIZE);
106 offset %= USB_PAGE_SIZE;
108 res->length = USB_PAGE_SIZE - offset;
109 res->physaddr = page->physaddr + offset;
111 res->length = (usb_size_t)-1;
112 res->physaddr = page->physaddr + offset;
116 /* Case 1b - Non Kernel Virtual Address */
118 res->buffer = USB_ADD_BYTES(page->buffer, offset);
123 /* Case 2 - Plain PIO */
125 res->buffer = USB_ADD_BYTES(pc->buffer, offset);
126 res->length = (usb_size_t)-1;
132 /*------------------------------------------------------------------------*
133 * usb_pc_buffer_is_aligned - verify alignment
135 * This function is used to check if a page cache buffer is properly
136 * aligned to reduce the use of bounce buffers in PIO mode.
137 *------------------------------------------------------------------------*/
139 usb_pc_buffer_is_aligned(struct usb_page_cache *pc, usb_frlength_t offset,
140 usb_frlength_t len, usb_frlength_t mask)
142 struct usb_page_search buf_res;
146 usbd_get_page(pc, offset, &buf_res);
148 if (buf_res.length > len)
149 buf_res.length = len;
150 if (USB_P2U(buf_res.buffer) & mask)
152 if (buf_res.length & mask)
155 offset += buf_res.length;
156 len -= buf_res.length;
161 /*------------------------------------------------------------------------*
162 * usbd_copy_in - copy directly to DMA-able memory
163 *------------------------------------------------------------------------*/
165 usbd_copy_in(struct usb_page_cache *cache, usb_frlength_t offset,
166 const void *ptr, usb_frlength_t len)
168 struct usb_page_search buf_res;
172 usbd_get_page(cache, offset, &buf_res);
174 if (buf_res.length > len) {
175 buf_res.length = len;
177 memcpy(buf_res.buffer, ptr, buf_res.length);
179 offset += buf_res.length;
180 len -= buf_res.length;
181 ptr = USB_ADD_BYTES(ptr, buf_res.length);
185 /*------------------------------------------------------------------------*
186 * usbd_copy_in_user - copy directly to DMA-able memory from userland
191 *------------------------------------------------------------------------*/
194 usbd_copy_in_user(struct usb_page_cache *cache, usb_frlength_t offset,
195 const void *ptr, usb_frlength_t len)
197 struct usb_page_search buf_res;
202 usbd_get_page(cache, offset, &buf_res);
204 if (buf_res.length > len) {
205 buf_res.length = len;
207 error = copyin(ptr, buf_res.buffer, buf_res.length);
211 offset += buf_res.length;
212 len -= buf_res.length;
213 ptr = USB_ADD_BYTES(ptr, buf_res.length);
215 return (0); /* success */
219 /*------------------------------------------------------------------------*
220 * usbd_m_copy_in - copy a mbuf chain directly into DMA-able memory
221 *------------------------------------------------------------------------*/
223 struct usb_m_copy_in_arg {
224 struct usb_page_cache *cache;
225 usb_frlength_t dst_offset;
229 usbd_m_copy_in_cb(void *arg, void *src, uint32_t count)
231 register struct usb_m_copy_in_arg *ua = arg;
233 usbd_copy_in(ua->cache, ua->dst_offset, src, count);
234 ua->dst_offset += count;
239 usbd_m_copy_in(struct usb_page_cache *cache, usb_frlength_t dst_offset,
240 struct mbuf *m, usb_size_t src_offset, usb_frlength_t src_len)
242 struct usb_m_copy_in_arg arg = {cache, dst_offset};
243 (void) m_apply(m, src_offset, src_len, &usbd_m_copy_in_cb, &arg);
247 /*------------------------------------------------------------------------*
248 * usb_uiomove - factored out code
249 *------------------------------------------------------------------------*/
252 usb_uiomove(struct usb_page_cache *pc, struct uio *uio,
253 usb_frlength_t pc_offset, usb_frlength_t len)
255 struct usb_page_search res;
260 usbd_get_page(pc, pc_offset, &res);
262 if (res.length > len) {
266 * "uiomove()" can sleep so one needs to make a wrapper,
267 * exiting the mutex and checking things
269 error = uiomove(res.buffer, res.length, uio);
274 pc_offset += res.length;
281 /*------------------------------------------------------------------------*
282 * usbd_copy_out - copy directly from DMA-able memory
283 *------------------------------------------------------------------------*/
285 usbd_copy_out(struct usb_page_cache *cache, usb_frlength_t offset,
286 void *ptr, usb_frlength_t len)
288 struct usb_page_search res;
292 usbd_get_page(cache, offset, &res);
294 if (res.length > len) {
297 memcpy(ptr, res.buffer, res.length);
299 offset += res.length;
301 ptr = USB_ADD_BYTES(ptr, res.length);
305 /*------------------------------------------------------------------------*
306 * usbd_copy_out_user - copy directly from DMA-able memory to userland
311 *------------------------------------------------------------------------*/
314 usbd_copy_out_user(struct usb_page_cache *cache, usb_frlength_t offset,
315 void *ptr, usb_frlength_t len)
317 struct usb_page_search res;
322 usbd_get_page(cache, offset, &res);
324 if (res.length > len) {
327 error = copyout(res.buffer, ptr, res.length);
331 offset += res.length;
333 ptr = USB_ADD_BYTES(ptr, res.length);
335 return (0); /* success */
339 /*------------------------------------------------------------------------*
340 * usbd_frame_zero - zero DMA-able memory
341 *------------------------------------------------------------------------*/
343 usbd_frame_zero(struct usb_page_cache *cache, usb_frlength_t offset,
346 struct usb_page_search res;
350 usbd_get_page(cache, offset, &res);
352 if (res.length > len) {
355 memset(res.buffer, 0, res.length);
357 offset += res.length;
364 /*------------------------------------------------------------------------*
365 * usb_dma_lock_cb - dummy callback
366 *------------------------------------------------------------------------*/
368 usb_dma_lock_cb(void *arg, bus_dma_lock_op_t op)
370 /* we use "mtx_owned()" instead of this function */
373 /*------------------------------------------------------------------------*
374 * usb_dma_tag_create - allocate a DMA tag
376 * NOTE: If the "align" parameter has a value of 1 the DMA-tag will
377 * allow multi-segment mappings. Else all mappings are single-segment.
378 *------------------------------------------------------------------------*/
380 usb_dma_tag_create(struct usb_dma_tag *udt,
381 usb_size_t size, usb_size_t align)
385 if (bus_dma_tag_create
386 ( /* parent */ udt->tag_parent->tag,
387 /* alignment */ align,
389 /* lowaddr */ (2ULL << (udt->tag_parent->dma_bits - 1)) - 1,
390 /* highaddr */ BUS_SPACE_MAXADDR,
392 /* filterarg */ NULL,
394 /* nsegments */ (align == 1 && size > 1) ?
395 (2 + (size / USB_PAGE_SIZE)) : 1,
396 /* maxsegsz */ (align == 1 && size > USB_PAGE_SIZE) ?
397 USB_PAGE_SIZE : size,
398 /* flags */ BUS_DMA_KEEP_PG_OFFSET,
399 /* lockfn */ &usb_dma_lock_cb,
407 /*------------------------------------------------------------------------*
408 * usb_dma_tag_free - free a DMA tag
409 *------------------------------------------------------------------------*/
411 usb_dma_tag_destroy(struct usb_dma_tag *udt)
413 bus_dma_tag_destroy(udt->tag);
416 /*------------------------------------------------------------------------*
417 * usb_pc_alloc_mem_cb - BUS-DMA callback function
418 *------------------------------------------------------------------------*/
420 usb_pc_alloc_mem_cb(void *arg, bus_dma_segment_t *segs,
423 usb_pc_common_mem_cb(arg, segs, nseg, error, 0);
426 /*------------------------------------------------------------------------*
427 * usb_pc_load_mem_cb - BUS-DMA callback function
428 *------------------------------------------------------------------------*/
430 usb_pc_load_mem_cb(void *arg, bus_dma_segment_t *segs,
433 usb_pc_common_mem_cb(arg, segs, nseg, error, 1);
436 /*------------------------------------------------------------------------*
437 * usb_pc_common_mem_cb - BUS-DMA callback function
438 *------------------------------------------------------------------------*/
440 usb_pc_common_mem_cb(void *arg, bus_dma_segment_t *segs,
441 int nseg, int error, uint8_t isload)
443 struct usb_dma_parent_tag *uptag;
444 struct usb_page_cache *pc;
451 uptag = pc->tag_parent;
454 * XXX There is sometimes recursive locking here.
455 * XXX We should try to find a better solution.
456 * XXX Until further the "owned" variable does
466 pg->physaddr = segs->ds_addr & ~(USB_PAGE_SIZE - 1);
467 rem = segs->ds_addr & (USB_PAGE_SIZE - 1);
468 pc->page_offset_buf = rem;
469 pc->page_offset_end += rem;
472 ((segs->ds_addr + segs->ds_len) & (USB_PAGE_SIZE - 1)) !=
473 ((segs + 1)->ds_addr & (USB_PAGE_SIZE - 1))) {
475 * This check verifies there is no page offset hole
476 * between the first and second segment. See the
477 * BUS_DMA_KEEP_PG_OFFSET flag.
479 DPRINTFN(0, "Page offset was not preserved\n");
484 while (pc->ismultiseg) {
485 off += USB_PAGE_SIZE;
486 if (off >= (segs->ds_len + rem)) {
496 pg->physaddr = (segs->ds_addr + off) & ~(USB_PAGE_SIZE - 1);
500 owned = mtx_owned(uptag->mtx);
502 mtx_lock(uptag->mtx);
504 uptag->dma_error = (error ? 1 : 0);
506 (uptag->func) (uptag);
508 cv_broadcast(uptag->cv);
511 mtx_unlock(uptag->mtx);
514 /*------------------------------------------------------------------------*
515 * usb_pc_alloc_mem - allocate DMA'able memory
520 *------------------------------------------------------------------------*/
522 usb_pc_alloc_mem(struct usb_page_cache *pc, struct usb_page *pg,
523 usb_size_t size, usb_size_t align)
525 struct usb_dma_parent_tag *uptag;
526 struct usb_dma_tag *utag;
531 uptag = pc->tag_parent;
535 * The alignment must be greater or equal to the
536 * "size" else the object can be split between two
537 * memory pages and we get a problem!
539 while (align < size) {
547 * XXX BUS-DMA workaround - FIXME later:
549 * We assume that that the aligment at this point of
550 * the code is greater than or equal to the size and
551 * less than two times the size, so that if we double
552 * the size, the size will be greater than the
555 * The bus-dma system has a check for "alignment"
556 * being less than "size". If that check fails we end
557 * up using contigmalloc which is page based even for
558 * small allocations. Try to avoid that to save
559 * memory, hence we sometimes to a large number of
562 if (size <= (USB_PAGE_SIZE / 2)) {
567 /* get the correct DMA tag */
568 utag = usb_dma_tag_find(uptag, size, align);
572 /* allocate memory */
573 if (bus_dmamem_alloc(
574 utag->tag, &ptr, (BUS_DMA_WAITOK | BUS_DMA_COHERENT), &map)) {
577 /* setup page cache */
580 pc->page_offset_buf = 0;
581 pc->page_offset_end = size;
584 pc->ismultiseg = (align == 1);
586 mtx_lock(uptag->mtx);
588 /* load memory into DMA */
589 err = bus_dmamap_load(
590 utag->tag, map, ptr, size, &usb_pc_alloc_mem_cb,
591 pc, (BUS_DMA_WAITOK | BUS_DMA_COHERENT));
593 if (err == EINPROGRESS) {
594 cv_wait(uptag->cv, uptag->mtx);
597 mtx_unlock(uptag->mtx);
599 if (err || uptag->dma_error) {
600 bus_dmamem_free(utag->tag, ptr, map);
603 memset(ptr, 0, size);
605 usb_pc_cpu_flush(pc);
610 /* reset most of the page cache */
612 pc->page_start = NULL;
613 pc->page_offset_buf = 0;
614 pc->page_offset_end = 0;
620 /*------------------------------------------------------------------------*
621 * usb_pc_free_mem - free DMA memory
623 * This function is NULL safe.
624 *------------------------------------------------------------------------*/
626 usb_pc_free_mem(struct usb_page_cache *pc)
628 if (pc && pc->buffer) {
630 bus_dmamap_unload(pc->tag, pc->map);
632 bus_dmamem_free(pc->tag, pc->buffer, pc->map);
638 /*------------------------------------------------------------------------*
639 * usb_pc_load_mem - load virtual memory into DMA
644 *------------------------------------------------------------------------*/
646 usb_pc_load_mem(struct usb_page_cache *pc, usb_size_t size, uint8_t sync)
648 /* setup page cache */
649 pc->page_offset_buf = 0;
650 pc->page_offset_end = size;
653 mtx_assert(pc->tag_parent->mtx, MA_OWNED);
657 struct usb_dma_parent_tag *uptag;
660 uptag = pc->tag_parent;
663 * We have to unload the previous loaded DMA
664 * pages before trying to load a new one!
666 bus_dmamap_unload(pc->tag, pc->map);
669 * Try to load memory into DMA.
671 err = bus_dmamap_load(
672 pc->tag, pc->map, pc->buffer, size,
673 &usb_pc_alloc_mem_cb, pc, BUS_DMA_WAITOK);
674 if (err == EINPROGRESS) {
675 cv_wait(uptag->cv, uptag->mtx);
678 if (err || uptag->dma_error) {
684 * We have to unload the previous loaded DMA
685 * pages before trying to load a new one!
687 bus_dmamap_unload(pc->tag, pc->map);
690 * Try to load memory into DMA. The callback
691 * will be called in all cases:
694 pc->tag, pc->map, pc->buffer, size,
695 &usb_pc_load_mem_cb, pc, BUS_DMA_WAITOK)) {
701 * Call callback so that refcount is decremented
704 pc->tag_parent->dma_error = 0;
705 (pc->tag_parent->func) (pc->tag_parent);
711 /*------------------------------------------------------------------------*
712 * usb_pc_cpu_invalidate - invalidate CPU cache
713 *------------------------------------------------------------------------*/
715 usb_pc_cpu_invalidate(struct usb_page_cache *pc)
717 if (pc->page_offset_end == pc->page_offset_buf) {
718 /* nothing has been loaded into this page cache! */
723 * TODO: We currently do XXX_POSTREAD and XXX_PREREAD at the
724 * same time, but in the future we should try to isolate the
725 * different cases to optimise the code. --HPS
727 bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_POSTREAD);
728 bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREREAD);
731 /*------------------------------------------------------------------------*
732 * usb_pc_cpu_flush - flush CPU cache
733 *------------------------------------------------------------------------*/
735 usb_pc_cpu_flush(struct usb_page_cache *pc)
737 if (pc->page_offset_end == pc->page_offset_buf) {
738 /* nothing has been loaded into this page cache! */
741 bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREWRITE);
744 /*------------------------------------------------------------------------*
745 * usb_pc_dmamap_create - create a DMA map
750 *------------------------------------------------------------------------*/
752 usb_pc_dmamap_create(struct usb_page_cache *pc, usb_size_t size)
754 struct usb_xfer_root *info;
755 struct usb_dma_tag *utag;
758 info = USB_DMATAG_TO_XROOT(pc->tag_parent);
764 utag = usb_dma_tag_find(pc->tag_parent, size, 1);
769 if (bus_dmamap_create(utag->tag, 0, &pc->map)) {
773 return 0; /* success */
778 return 1; /* failure */
781 /*------------------------------------------------------------------------*
782 * usb_pc_dmamap_destroy
784 * This function is NULL safe.
785 *------------------------------------------------------------------------*/
787 usb_pc_dmamap_destroy(struct usb_page_cache *pc)
790 bus_dmamap_destroy(pc->tag, pc->map);
796 /*------------------------------------------------------------------------*
797 * usb_dma_tag_find - factored out code
798 *------------------------------------------------------------------------*/
800 usb_dma_tag_find(struct usb_dma_parent_tag *udpt,
801 usb_size_t size, usb_size_t align)
803 struct usb_dma_tag *udt;
806 USB_ASSERT(align > 0, ("Invalid parameter align = 0\n"));
807 USB_ASSERT(size > 0, ("Invalid parameter size = 0\n"));
809 udt = udpt->utag_first;
810 nudt = udpt->utag_max;
814 if (udt->align == 0) {
815 usb_dma_tag_create(udt, size, align);
816 if (udt->tag == NULL) {
823 if ((udt->align == align) && (udt->size == size)) {
831 /*------------------------------------------------------------------------*
832 * usb_dma_tag_setup - initialise USB DMA tags
833 *------------------------------------------------------------------------*/
835 usb_dma_tag_setup(struct usb_dma_parent_tag *udpt,
836 struct usb_dma_tag *udt, bus_dma_tag_t dmat,
837 struct mtx *mtx, usb_dma_callback_t *func,
838 uint8_t ndmabits, uint8_t nudt)
840 memset(udpt, 0, sizeof(*udpt));
842 /* sanity checking */
846 /* something is corrupt */
849 /* initialise condition variable */
850 cv_init(udpt->cv, "USB DMA CV");
852 /* store some information */
856 udpt->utag_first = udt;
857 udpt->utag_max = nudt;
858 udpt->dma_bits = ndmabits;
861 memset(udt, 0, sizeof(*udt));
862 udt->tag_parent = udpt;
867 /*------------------------------------------------------------------------*
868 * usb_bus_tag_unsetup - factored out code
869 *------------------------------------------------------------------------*/
871 usb_dma_tag_unsetup(struct usb_dma_parent_tag *udpt)
873 struct usb_dma_tag *udt;
876 udt = udpt->utag_first;
877 nudt = udpt->utag_max;
882 /* destroy the USB DMA tag */
883 usb_dma_tag_destroy(udt);
889 if (udpt->utag_max) {
890 /* destroy the condition variable */
891 cv_destroy(udpt->cv);
895 /*------------------------------------------------------------------------*
898 * This function handles loading of virtual buffers into DMA and is
899 * only called when "dma_refcount" is zero.
900 *------------------------------------------------------------------------*/
902 usb_bdma_work_loop(struct usb_xfer_queue *pq)
904 struct usb_xfer_root *info;
905 struct usb_xfer *xfer;
906 usb_frcount_t nframes;
911 mtx_assert(info->xfer_mtx, MA_OWNED);
914 /* some error happened */
915 USB_BUS_LOCK(info->bus);
916 usbd_transfer_done(xfer, 0);
917 USB_BUS_UNLOCK(info->bus);
920 if (!xfer->flags_int.bdma_setup) {
922 usb_frlength_t frlength_0;
925 xfer->flags_int.bdma_setup = 1;
927 /* reset BUS-DMA load state */
931 if (xfer->flags_int.isochronous_xfr) {
932 /* only one frame buffer */
934 frlength_0 = xfer->sumlen;
936 /* can be multiple frame buffers */
937 nframes = xfer->nframes;
938 frlength_0 = xfer->frlengths[0];
942 * Set DMA direction first. This is needed to
943 * select the correct cache invalidate and cache
946 isread = USB_GET_DATA_ISREAD(xfer);
947 pg = xfer->dma_page_ptr;
949 if (xfer->flags_int.control_xfr &&
950 xfer->flags_int.control_hdr) {
952 if (xfer->flags_int.usb_mode == USB_MODE_DEVICE) {
953 /* The device controller writes to memory */
954 xfer->frbuffers[0].isread = 1;
956 /* The host controller reads from memory */
957 xfer->frbuffers[0].isread = 0;
961 xfer->frbuffers[0].isread = isread;
965 * Setup the "page_start" pointer which points to an array of
966 * USB pages where information about the physical address of a
967 * page will be stored. Also initialise the "isread" field of
968 * the USB page caches.
970 xfer->frbuffers[0].page_start = pg;
972 info->dma_nframes = nframes;
973 info->dma_currframe = 0;
974 info->dma_frlength_0 = frlength_0;
976 pg += (frlength_0 / USB_PAGE_SIZE);
979 while (--nframes > 0) {
980 xfer->frbuffers[nframes].isread = isread;
981 xfer->frbuffers[nframes].page_start = pg;
983 pg += (xfer->frlengths[nframes] / USB_PAGE_SIZE);
988 if (info->dma_error) {
989 USB_BUS_LOCK(info->bus);
990 usbd_transfer_done(xfer, USB_ERR_DMA_LOAD_FAILED);
991 USB_BUS_UNLOCK(info->bus);
994 if (info->dma_currframe != info->dma_nframes) {
996 if (info->dma_currframe == 0) {
998 usb_pc_load_mem(xfer->frbuffers,
999 info->dma_frlength_0, 0);
1002 nframes = info->dma_currframe;
1003 usb_pc_load_mem(xfer->frbuffers + nframes,
1004 xfer->frlengths[nframes], 0);
1007 /* advance frame index */
1008 info->dma_currframe++;
1013 usb_bdma_pre_sync(xfer);
1015 /* start loading next USB transfer, if any */
1016 usb_command_wrapper(pq, NULL);
1018 /* finally start the hardware */
1019 usbd_pipe_enter(xfer);
1022 /*------------------------------------------------------------------------*
1023 * usb_bdma_done_event
1025 * This function is called when the BUS-DMA has loaded virtual memory
1027 *------------------------------------------------------------------------*/
1029 usb_bdma_done_event(struct usb_dma_parent_tag *udpt)
1031 struct usb_xfer_root *info;
1033 info = USB_DMATAG_TO_XROOT(udpt);
1035 mtx_assert(info->xfer_mtx, MA_OWNED);
1038 info->dma_error = udpt->dma_error;
1040 /* enter workloop again */
1041 usb_command_wrapper(&info->dma_q,
1045 /*------------------------------------------------------------------------*
1048 * This function handles DMA synchronisation that must be done before
1049 * an USB transfer is started.
1050 *------------------------------------------------------------------------*/
1052 usb_bdma_pre_sync(struct usb_xfer *xfer)
1054 struct usb_page_cache *pc;
1055 usb_frcount_t nframes;
1057 if (xfer->flags_int.isochronous_xfr) {
1058 /* only one frame buffer */
1061 /* can be multiple frame buffers */
1062 nframes = xfer->nframes;
1065 pc = xfer->frbuffers;
1070 usb_pc_cpu_invalidate(pc);
1072 usb_pc_cpu_flush(pc);
1078 /*------------------------------------------------------------------------*
1079 * usb_bdma_post_sync
1081 * This function handles DMA synchronisation that must be done after
1082 * an USB transfer is complete.
1083 *------------------------------------------------------------------------*/
1085 usb_bdma_post_sync(struct usb_xfer *xfer)
1087 struct usb_page_cache *pc;
1088 usb_frcount_t nframes;
1090 if (xfer->flags_int.isochronous_xfr) {
1091 /* only one frame buffer */
1094 /* can be multiple frame buffers */
1095 nframes = xfer->nframes;
1098 pc = xfer->frbuffers;
1102 usb_pc_cpu_invalidate(pc);