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1 /* $FreeBSD$ */
2 /*-
3  * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
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.
13  *
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
24  * SUCH DAMAGE.
25  */
26
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>
34 #include <sys/bus.h>
35 #include <sys/module.h>
36 #include <sys/lock.h>
37 #include <sys/mutex.h>
38 #include <sys/condvar.h>
39 #include <sys/sysctl.h>
40 #include <sys/sx.h>
41 #include <sys/unistd.h>
42 #include <sys/callout.h>
43 #include <sys/malloc.h>
44 #include <sys/priv.h>
45
46 #include <dev/usb/usb.h>
47 #include <dev/usb/usbdi.h>
48 #include <dev/usb/usbdi_util.h>
49
50 #define USB_DEBUG_VAR usb_debug
51
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>
59
60 #include <dev/usb/usb_controller.h>
61 #include <dev/usb/usb_bus.h>
62
63 #if USB_HAVE_BUSDMA
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,
70                     uint8_t);
71 #endif
72
73 /*------------------------------------------------------------------------*
74  *  usbd_get_page - lookup DMA-able memory for the given offset
75  *
76  * NOTE: Only call this function when the "page_cache" structure has
77  * been properly initialized !
78  *------------------------------------------------------------------------*/
79 void
80 usbd_get_page(struct usb_page_cache *pc, usb_frlength_t offset,
81     struct usb_page_search *res)
82 {
83 #if USB_HAVE_BUSDMA
84         struct usb_page *page;
85
86         if (pc->page_start) {
87
88                 /* Case 1 - something has been loaded into DMA */
89
90                 if (pc->buffer) {
91
92                         /* Case 1a - Kernel Virtual Address */
93
94                         res->buffer = USB_ADD_BYTES(pc->buffer, offset);
95                 }
96                 offset += pc->page_offset_buf;
97
98                 /* compute destination page */
99
100                 page = pc->page_start;
101
102                 if (pc->ismultiseg) {
103
104                         page += (offset / USB_PAGE_SIZE);
105
106                         offset %= USB_PAGE_SIZE;
107
108                         res->length = USB_PAGE_SIZE - offset;
109                         res->physaddr = page->physaddr + offset;
110                 } else {
111                         res->length = (usb_size_t)-1;
112                         res->physaddr = page->physaddr + offset;
113                 }
114                 if (!pc->buffer) {
115
116                         /* Case 1b - Non Kernel Virtual Address */
117
118                         res->buffer = USB_ADD_BYTES(page->buffer, offset);
119                 }
120                 return;
121         }
122 #endif
123         /* Case 2 - Plain PIO */
124
125         res->buffer = USB_ADD_BYTES(pc->buffer, offset);
126         res->length = (usb_size_t)-1;
127 #if USB_HAVE_BUSDMA
128         res->physaddr = 0;
129 #endif
130 }
131
132 /*------------------------------------------------------------------------*
133  *  usbd_copy_in - copy directly to DMA-able memory
134  *------------------------------------------------------------------------*/
135 void
136 usbd_copy_in(struct usb_page_cache *cache, usb_frlength_t offset,
137     const void *ptr, usb_frlength_t len)
138 {
139         struct usb_page_search buf_res;
140
141         while (len != 0) {
142
143                 usbd_get_page(cache, offset, &buf_res);
144
145                 if (buf_res.length > len) {
146                         buf_res.length = len;
147                 }
148                 memcpy(buf_res.buffer, ptr, buf_res.length);
149
150                 offset += buf_res.length;
151                 len -= buf_res.length;
152                 ptr = USB_ADD_BYTES(ptr, buf_res.length);
153         }
154 }
155
156 /*------------------------------------------------------------------------*
157  *  usbd_copy_in_user - copy directly to DMA-able memory from userland
158  *
159  * Return values:
160  *    0: Success
161  * Else: Failure
162  *------------------------------------------------------------------------*/
163 #if USB_HAVE_USER_IO
164 int
165 usbd_copy_in_user(struct usb_page_cache *cache, usb_frlength_t offset,
166     const void *ptr, usb_frlength_t len)
167 {
168         struct usb_page_search buf_res;
169         int error;
170
171         while (len != 0) {
172
173                 usbd_get_page(cache, offset, &buf_res);
174
175                 if (buf_res.length > len) {
176                         buf_res.length = len;
177                 }
178                 error = copyin(ptr, buf_res.buffer, buf_res.length);
179                 if (error)
180                         return (error);
181
182                 offset += buf_res.length;
183                 len -= buf_res.length;
184                 ptr = USB_ADD_BYTES(ptr, buf_res.length);
185         }
186         return (0);                     /* success */
187 }
188 #endif
189
190 /*------------------------------------------------------------------------*
191  *  usbd_m_copy_in - copy a mbuf chain directly into DMA-able memory
192  *------------------------------------------------------------------------*/
193 #if USB_HAVE_MBUF
194 struct usb_m_copy_in_arg {
195         struct usb_page_cache *cache;
196         usb_frlength_t dst_offset;
197 };
198
199 static int
200 usbd_m_copy_in_cb(void *arg, void *src, uint32_t count)
201 {
202         register struct usb_m_copy_in_arg *ua = arg;
203
204         usbd_copy_in(ua->cache, ua->dst_offset, src, count);
205         ua->dst_offset += count;
206         return (0);
207 }
208
209 void
210 usbd_m_copy_in(struct usb_page_cache *cache, usb_frlength_t dst_offset,
211     struct mbuf *m, usb_size_t src_offset, usb_frlength_t src_len)
212 {
213         struct usb_m_copy_in_arg arg = {cache, dst_offset};
214         int error;
215
216         error = m_apply(m, src_offset, src_len, &usbd_m_copy_in_cb, &arg);
217 }
218 #endif
219
220 /*------------------------------------------------------------------------*
221  *  usb_uiomove - factored out code
222  *------------------------------------------------------------------------*/
223 #if USB_HAVE_USER_IO
224 int
225 usb_uiomove(struct usb_page_cache *pc, struct uio *uio,
226     usb_frlength_t pc_offset, usb_frlength_t len)
227 {
228         struct usb_page_search res;
229         int error = 0;
230
231         while (len != 0) {
232
233                 usbd_get_page(pc, pc_offset, &res);
234
235                 if (res.length > len) {
236                         res.length = len;
237                 }
238                 /*
239                  * "uiomove()" can sleep so one needs to make a wrapper,
240                  * exiting the mutex and checking things
241                  */
242                 error = uiomove(res.buffer, res.length, uio);
243
244                 if (error) {
245                         break;
246                 }
247                 pc_offset += res.length;
248                 len -= res.length;
249         }
250         return (error);
251 }
252 #endif
253
254 /*------------------------------------------------------------------------*
255  *  usbd_copy_out - copy directly from DMA-able memory
256  *------------------------------------------------------------------------*/
257 void
258 usbd_copy_out(struct usb_page_cache *cache, usb_frlength_t offset,
259     void *ptr, usb_frlength_t len)
260 {
261         struct usb_page_search res;
262
263         while (len != 0) {
264
265                 usbd_get_page(cache, offset, &res);
266
267                 if (res.length > len) {
268                         res.length = len;
269                 }
270                 memcpy(ptr, res.buffer, res.length);
271
272                 offset += res.length;
273                 len -= res.length;
274                 ptr = USB_ADD_BYTES(ptr, res.length);
275         }
276 }
277
278 /*------------------------------------------------------------------------*
279  *  usbd_copy_out_user - copy directly from DMA-able memory to userland
280  *
281  * Return values:
282  *    0: Success
283  * Else: Failure
284  *------------------------------------------------------------------------*/
285 #if USB_HAVE_USER_IO
286 int
287 usbd_copy_out_user(struct usb_page_cache *cache, usb_frlength_t offset,
288     void *ptr, usb_frlength_t len)
289 {
290         struct usb_page_search res;
291         int error;
292
293         while (len != 0) {
294
295                 usbd_get_page(cache, offset, &res);
296
297                 if (res.length > len) {
298                         res.length = len;
299                 }
300                 error = copyout(res.buffer, ptr, res.length);
301                 if (error)
302                         return (error);
303
304                 offset += res.length;
305                 len -= res.length;
306                 ptr = USB_ADD_BYTES(ptr, res.length);
307         }
308         return (0);                     /* success */
309 }
310 #endif
311
312 /*------------------------------------------------------------------------*
313  *  usbd_frame_zero - zero DMA-able memory
314  *------------------------------------------------------------------------*/
315 void
316 usbd_frame_zero(struct usb_page_cache *cache, usb_frlength_t offset,
317     usb_frlength_t len)
318 {
319         struct usb_page_search res;
320
321         while (len != 0) {
322
323                 usbd_get_page(cache, offset, &res);
324
325                 if (res.length > len) {
326                         res.length = len;
327                 }
328                 memset(res.buffer, 0, res.length);
329
330                 offset += res.length;
331                 len -= res.length;
332         }
333 }
334
335 #if USB_HAVE_BUSDMA
336
337 /*------------------------------------------------------------------------*
338  *      usb_dma_lock_cb - dummy callback
339  *------------------------------------------------------------------------*/
340 static void
341 usb_dma_lock_cb(void *arg, bus_dma_lock_op_t op)
342 {
343         /* we use "mtx_owned()" instead of this function */
344 }
345
346 /*------------------------------------------------------------------------*
347  *      usb_dma_tag_create - allocate a DMA tag
348  *
349  * NOTE: If the "align" parameter has a value of 1 the DMA-tag will
350  * allow multi-segment mappings. Else all mappings are single-segment.
351  *------------------------------------------------------------------------*/
352 static void
353 usb_dma_tag_create(struct usb_dma_tag *udt,
354     usb_size_t size, usb_size_t align)
355 {
356         bus_dma_tag_t tag;
357
358         if (bus_dma_tag_create
359             ( /* parent    */ udt->tag_parent->tag,
360              /* alignment */ align,
361              /* boundary  */ (align == 1) ?
362             USB_PAGE_SIZE : 0,
363              /* lowaddr   */ (2ULL << (udt->tag_parent->dma_bits - 1)) - 1,
364              /* highaddr  */ BUS_SPACE_MAXADDR,
365              /* filter    */ NULL,
366              /* filterarg */ NULL,
367              /* maxsize   */ size,
368              /* nsegments */ (align == 1 && size > 1) ?
369             (2 + (size / USB_PAGE_SIZE)) : 1,
370              /* maxsegsz  */ (align == 1 && size > USB_PAGE_SIZE) ?
371             USB_PAGE_SIZE : size,
372              /* flags     */ BUS_DMA_KEEP_PG_OFFSET,
373              /* lockfn    */ &usb_dma_lock_cb,
374              /* lockarg   */ NULL,
375             &tag)) {
376                 tag = NULL;
377         }
378         udt->tag = tag;
379 }
380
381 /*------------------------------------------------------------------------*
382  *      usb_dma_tag_free - free a DMA tag
383  *------------------------------------------------------------------------*/
384 static void
385 usb_dma_tag_destroy(struct usb_dma_tag *udt)
386 {
387         bus_dma_tag_destroy(udt->tag);
388 }
389
390 /*------------------------------------------------------------------------*
391  *      usb_pc_alloc_mem_cb - BUS-DMA callback function
392  *------------------------------------------------------------------------*/
393 static void
394 usb_pc_alloc_mem_cb(void *arg, bus_dma_segment_t *segs,
395     int nseg, int error)
396 {
397         usb_pc_common_mem_cb(arg, segs, nseg, error, 0);
398 }
399
400 /*------------------------------------------------------------------------*
401  *      usb_pc_load_mem_cb - BUS-DMA callback function
402  *------------------------------------------------------------------------*/
403 static void
404 usb_pc_load_mem_cb(void *arg, bus_dma_segment_t *segs,
405     int nseg, int error)
406 {
407         usb_pc_common_mem_cb(arg, segs, nseg, error, 1);
408 }
409
410 /*------------------------------------------------------------------------*
411  *      usb_pc_common_mem_cb - BUS-DMA callback function
412  *------------------------------------------------------------------------*/
413 static void
414 usb_pc_common_mem_cb(void *arg, bus_dma_segment_t *segs,
415     int nseg, int error, uint8_t isload)
416 {
417         struct usb_dma_parent_tag *uptag;
418         struct usb_page_cache *pc;
419         struct usb_page *pg;
420         usb_size_t rem;
421         uint8_t owned;
422
423         pc = arg;
424         uptag = pc->tag_parent;
425
426         /*
427          * XXX There is sometimes recursive locking here.
428          * XXX We should try to find a better solution.
429          * XXX Until further the "owned" variable does
430          * XXX the trick.
431          */
432
433         if (error) {
434                 goto done;
435         }
436         pg = pc->page_start;
437         pg->physaddr = segs->ds_addr & ~(USB_PAGE_SIZE - 1);
438         rem = segs->ds_addr & (USB_PAGE_SIZE - 1);
439         pc->page_offset_buf = rem;
440         pc->page_offset_end += rem;
441         nseg--;
442 #ifdef USB_DEBUG
443         if (rem != (USB_P2U(pc->buffer) & (USB_PAGE_SIZE - 1))) {
444                 /*
445                  * This check verifies that the physical address is correct:
446                  */
447                 DPRINTFN(0, "Page offset was not preserved\n");
448                 error = 1;
449                 goto done;
450         }
451 #endif
452         while (nseg > 0) {
453                 nseg--;
454                 segs++;
455                 pg++;
456                 pg->physaddr = segs->ds_addr & ~(USB_PAGE_SIZE - 1);
457         }
458
459 done:
460         owned = mtx_owned(uptag->mtx);
461         if (!owned)
462                 mtx_lock(uptag->mtx);
463
464         uptag->dma_error = (error ? 1 : 0);
465         if (isload) {
466                 (uptag->func) (uptag);
467         } else {
468                 cv_broadcast(uptag->cv);
469         }
470         if (!owned)
471                 mtx_unlock(uptag->mtx);
472 }
473
474 /*------------------------------------------------------------------------*
475  *      usb_pc_alloc_mem - allocate DMA'able memory
476  *
477  * Returns:
478  *    0: Success
479  * Else: Failure
480  *------------------------------------------------------------------------*/
481 uint8_t
482 usb_pc_alloc_mem(struct usb_page_cache *pc, struct usb_page *pg,
483     usb_size_t size, usb_size_t align)
484 {
485         struct usb_dma_parent_tag *uptag;
486         struct usb_dma_tag *utag;
487         bus_dmamap_t map;
488         void *ptr;
489         int err;
490
491         uptag = pc->tag_parent;
492
493         if (align != 1) {
494                 /*
495                  * The alignment must be greater or equal to the
496                  * "size" else the object can be split between two
497                  * memory pages and we get a problem!
498                  */
499                 while (align < size) {
500                         align *= 2;
501                         if (align == 0) {
502                                 goto error;
503                         }
504                 }
505 #if 1
506                 /*
507                  * XXX BUS-DMA workaround - FIXME later:
508                  *
509                  * We assume that that the aligment at this point of
510                  * the code is greater than or equal to the size and
511                  * less than two times the size, so that if we double
512                  * the size, the size will be greater than the
513                  * alignment.
514                  *
515                  * The bus-dma system has a check for "alignment"
516                  * being less than "size". If that check fails we end
517                  * up using contigmalloc which is page based even for
518                  * small allocations. Try to avoid that to save
519                  * memory, hence we sometimes to a large number of
520                  * small allocations!
521                  */
522                 if (size <= (USB_PAGE_SIZE / 2)) {
523                         size *= 2;
524                 }
525 #endif
526         }
527         /* get the correct DMA tag */
528         utag = usb_dma_tag_find(uptag, size, align);
529         if (utag == NULL) {
530                 goto error;
531         }
532         /* allocate memory */
533         if (bus_dmamem_alloc(
534             utag->tag, &ptr, (BUS_DMA_WAITOK | BUS_DMA_COHERENT), &map)) {
535                 goto error;
536         }
537         /* setup page cache */
538         pc->buffer = ptr;
539         pc->page_start = pg;
540         pc->page_offset_buf = 0;
541         pc->page_offset_end = size;
542         pc->map = map;
543         pc->tag = utag->tag;
544         pc->ismultiseg = (align == 1);
545
546         mtx_lock(uptag->mtx);
547
548         /* load memory into DMA */
549         err = bus_dmamap_load(
550             utag->tag, map, ptr, size, &usb_pc_alloc_mem_cb,
551             pc, (BUS_DMA_WAITOK | BUS_DMA_COHERENT));
552
553         if (err == EINPROGRESS) {
554                 cv_wait(uptag->cv, uptag->mtx);
555                 err = 0;
556         }
557         mtx_unlock(uptag->mtx);
558
559         if (err || uptag->dma_error) {
560                 bus_dmamem_free(utag->tag, ptr, map);
561                 goto error;
562         }
563         memset(ptr, 0, size);
564
565         usb_pc_cpu_flush(pc);
566
567         return (0);
568
569 error:
570         /* reset most of the page cache */
571         pc->buffer = NULL;
572         pc->page_start = NULL;
573         pc->page_offset_buf = 0;
574         pc->page_offset_end = 0;
575         pc->map = NULL;
576         pc->tag = NULL;
577         return (1);
578 }
579
580 /*------------------------------------------------------------------------*
581  *      usb_pc_free_mem - free DMA memory
582  *
583  * This function is NULL safe.
584  *------------------------------------------------------------------------*/
585 void
586 usb_pc_free_mem(struct usb_page_cache *pc)
587 {
588         if (pc && pc->buffer) {
589
590                 bus_dmamap_unload(pc->tag, pc->map);
591
592                 bus_dmamem_free(pc->tag, pc->buffer, pc->map);
593
594                 pc->buffer = NULL;
595         }
596 }
597
598 /*------------------------------------------------------------------------*
599  *      usb_pc_load_mem - load virtual memory into DMA
600  *
601  * Return values:
602  * 0: Success
603  * Else: Error
604  *------------------------------------------------------------------------*/
605 uint8_t
606 usb_pc_load_mem(struct usb_page_cache *pc, usb_size_t size, uint8_t sync)
607 {
608         /* setup page cache */
609         pc->page_offset_buf = 0;
610         pc->page_offset_end = size;
611         pc->ismultiseg = 1;
612
613         mtx_assert(pc->tag_parent->mtx, MA_OWNED);
614
615         if (size > 0) {
616                 if (sync) {
617                         struct usb_dma_parent_tag *uptag;
618                         int err;
619
620                         uptag = pc->tag_parent;
621
622                         /*
623                          * We have to unload the previous loaded DMA
624                          * pages before trying to load a new one!
625                          */
626                         bus_dmamap_unload(pc->tag, pc->map);
627
628                         /*
629                          * Try to load memory into DMA.
630                          */
631                         err = bus_dmamap_load(
632                             pc->tag, pc->map, pc->buffer, size,
633                             &usb_pc_alloc_mem_cb, pc, BUS_DMA_WAITOK);
634                         if (err == EINPROGRESS) {
635                                 cv_wait(uptag->cv, uptag->mtx);
636                                 err = 0;
637                         }
638                         if (err || uptag->dma_error) {
639                                 return (1);
640                         }
641                 } else {
642
643                         /*
644                          * We have to unload the previous loaded DMA
645                          * pages before trying to load a new one!
646                          */
647                         bus_dmamap_unload(pc->tag, pc->map);
648
649                         /*
650                          * Try to load memory into DMA. The callback
651                          * will be called in all cases:
652                          */
653                         if (bus_dmamap_load(
654                             pc->tag, pc->map, pc->buffer, size,
655                             &usb_pc_load_mem_cb, pc, BUS_DMA_WAITOK)) {
656                         }
657                 }
658         } else {
659                 if (!sync) {
660                         /*
661                          * Call callback so that refcount is decremented
662                          * properly:
663                          */
664                         pc->tag_parent->dma_error = 0;
665                         (pc->tag_parent->func) (pc->tag_parent);
666                 }
667         }
668         return (0);
669 }
670
671 /*------------------------------------------------------------------------*
672  *      usb_pc_cpu_invalidate - invalidate CPU cache
673  *------------------------------------------------------------------------*/
674 void
675 usb_pc_cpu_invalidate(struct usb_page_cache *pc)
676 {
677         if (pc->page_offset_end == pc->page_offset_buf) {
678                 /* nothing has been loaded into this page cache! */
679                 return;
680         }
681
682         /*
683          * TODO: We currently do XXX_POSTREAD and XXX_PREREAD at the
684          * same time, but in the future we should try to isolate the
685          * different cases to optimise the code. --HPS
686          */
687         bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_POSTREAD);
688         bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREREAD);
689 }
690
691 /*------------------------------------------------------------------------*
692  *      usb_pc_cpu_flush - flush CPU cache
693  *------------------------------------------------------------------------*/
694 void
695 usb_pc_cpu_flush(struct usb_page_cache *pc)
696 {
697         if (pc->page_offset_end == pc->page_offset_buf) {
698                 /* nothing has been loaded into this page cache! */
699                 return;
700         }
701         bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREWRITE);
702 }
703
704 /*------------------------------------------------------------------------*
705  *      usb_pc_dmamap_create - create a DMA map
706  *
707  * Returns:
708  *    0: Success
709  * Else: Failure
710  *------------------------------------------------------------------------*/
711 uint8_t
712 usb_pc_dmamap_create(struct usb_page_cache *pc, usb_size_t size)
713 {
714         struct usb_xfer_root *info;
715         struct usb_dma_tag *utag;
716
717         /* get info */
718         info = USB_DMATAG_TO_XROOT(pc->tag_parent);
719
720         /* sanity check */
721         if (info == NULL) {
722                 goto error;
723         }
724         utag = usb_dma_tag_find(pc->tag_parent, size, 1);
725         if (utag == NULL) {
726                 goto error;
727         }
728         /* create DMA map */
729         if (bus_dmamap_create(utag->tag, 0, &pc->map)) {
730                 goto error;
731         }
732         pc->tag = utag->tag;
733         return 0;                       /* success */
734
735 error:
736         pc->map = NULL;
737         pc->tag = NULL;
738         return 1;                       /* failure */
739 }
740
741 /*------------------------------------------------------------------------*
742  *      usb_pc_dmamap_destroy
743  *
744  * This function is NULL safe.
745  *------------------------------------------------------------------------*/
746 void
747 usb_pc_dmamap_destroy(struct usb_page_cache *pc)
748 {
749         if (pc && pc->tag) {
750                 bus_dmamap_destroy(pc->tag, pc->map);
751                 pc->tag = NULL;
752                 pc->map = NULL;
753         }
754 }
755
756 /*------------------------------------------------------------------------*
757  *      usb_dma_tag_find - factored out code
758  *------------------------------------------------------------------------*/
759 struct usb_dma_tag *
760 usb_dma_tag_find(struct usb_dma_parent_tag *udpt,
761     usb_size_t size, usb_size_t align)
762 {
763         struct usb_dma_tag *udt;
764         uint8_t nudt;
765
766         USB_ASSERT(align > 0, ("Invalid parameter align = 0\n"));
767         USB_ASSERT(size > 0, ("Invalid parameter size = 0\n"));
768
769         udt = udpt->utag_first;
770         nudt = udpt->utag_max;
771
772         while (nudt--) {
773
774                 if (udt->align == 0) {
775                         usb_dma_tag_create(udt, size, align);
776                         if (udt->tag == NULL) {
777                                 return (NULL);
778                         }
779                         udt->align = align;
780                         udt->size = size;
781                         return (udt);
782                 }
783                 if ((udt->align == align) && (udt->size == size)) {
784                         return (udt);
785                 }
786                 udt++;
787         }
788         return (NULL);
789 }
790
791 /*------------------------------------------------------------------------*
792  *      usb_dma_tag_setup - initialise USB DMA tags
793  *------------------------------------------------------------------------*/
794 void
795 usb_dma_tag_setup(struct usb_dma_parent_tag *udpt,
796     struct usb_dma_tag *udt, bus_dma_tag_t dmat,
797     struct mtx *mtx, usb_dma_callback_t *func,
798     uint8_t ndmabits, uint8_t nudt)
799 {
800         memset(udpt, 0, sizeof(*udpt));
801
802         /* sanity checking */
803         if ((nudt == 0) ||
804             (ndmabits == 0) ||
805             (mtx == NULL)) {
806                 /* something is corrupt */
807                 return;
808         }
809         /* initialise condition variable */
810         cv_init(udpt->cv, "USB DMA CV");
811
812         /* store some information */
813         udpt->mtx = mtx;
814         udpt->func = func;
815         udpt->tag = dmat;
816         udpt->utag_first = udt;
817         udpt->utag_max = nudt;
818         udpt->dma_bits = ndmabits;
819
820         while (nudt--) {
821                 memset(udt, 0, sizeof(*udt));
822                 udt->tag_parent = udpt;
823                 udt++;
824         }
825 }
826
827 /*------------------------------------------------------------------------*
828  *      usb_bus_tag_unsetup - factored out code
829  *------------------------------------------------------------------------*/
830 void
831 usb_dma_tag_unsetup(struct usb_dma_parent_tag *udpt)
832 {
833         struct usb_dma_tag *udt;
834         uint8_t nudt;
835
836         udt = udpt->utag_first;
837         nudt = udpt->utag_max;
838
839         while (nudt--) {
840
841                 if (udt->align) {
842                         /* destroy the USB DMA tag */
843                         usb_dma_tag_destroy(udt);
844                         udt->align = 0;
845                 }
846                 udt++;
847         }
848
849         if (udpt->utag_max) {
850                 /* destroy the condition variable */
851                 cv_destroy(udpt->cv);
852         }
853 }
854
855 /*------------------------------------------------------------------------*
856  *      usb_bdma_work_loop
857  *
858  * This function handles loading of virtual buffers into DMA and is
859  * only called when "dma_refcount" is zero.
860  *------------------------------------------------------------------------*/
861 void
862 usb_bdma_work_loop(struct usb_xfer_queue *pq)
863 {
864         struct usb_xfer_root *info;
865         struct usb_xfer *xfer;
866         usb_frcount_t nframes;
867
868         xfer = pq->curr;
869         info = xfer->xroot;
870
871         mtx_assert(info->xfer_mtx, MA_OWNED);
872
873         if (xfer->error) {
874                 /* some error happened */
875                 USB_BUS_LOCK(info->bus);
876                 usbd_transfer_done(xfer, 0);
877                 USB_BUS_UNLOCK(info->bus);
878                 return;
879         }
880         if (!xfer->flags_int.bdma_setup) {
881                 struct usb_page *pg;
882                 usb_frlength_t frlength_0;
883                 uint8_t isread;
884
885                 xfer->flags_int.bdma_setup = 1;
886
887                 /* reset BUS-DMA load state */
888
889                 info->dma_error = 0;
890
891                 if (xfer->flags_int.isochronous_xfr) {
892                         /* only one frame buffer */
893                         nframes = 1;
894                         frlength_0 = xfer->sumlen;
895                 } else {
896                         /* can be multiple frame buffers */
897                         nframes = xfer->nframes;
898                         frlength_0 = xfer->frlengths[0];
899                 }
900
901                 /*
902                  * Set DMA direction first. This is needed to
903                  * select the correct cache invalidate and cache
904                  * flush operations.
905                  */
906                 isread = USB_GET_DATA_ISREAD(xfer);
907                 pg = xfer->dma_page_ptr;
908
909                 if (xfer->flags_int.control_xfr &&
910                     xfer->flags_int.control_hdr) {
911                         /* special case */
912                         if (xfer->flags_int.usb_mode == USB_MODE_DEVICE) {
913                                 /* The device controller writes to memory */
914                                 xfer->frbuffers[0].isread = 1;
915                         } else {
916                                 /* The host controller reads from memory */
917                                 xfer->frbuffers[0].isread = 0;
918                         }
919                 } else {
920                         /* default case */
921                         xfer->frbuffers[0].isread = isread;
922                 }
923
924                 /*
925                  * Setup the "page_start" pointer which points to an array of
926                  * USB pages where information about the physical address of a
927                  * page will be stored. Also initialise the "isread" field of
928                  * the USB page caches.
929                  */
930                 xfer->frbuffers[0].page_start = pg;
931
932                 info->dma_nframes = nframes;
933                 info->dma_currframe = 0;
934                 info->dma_frlength_0 = frlength_0;
935
936                 pg += (frlength_0 / USB_PAGE_SIZE);
937                 pg += 2;
938
939                 while (--nframes > 0) {
940                         xfer->frbuffers[nframes].isread = isread;
941                         xfer->frbuffers[nframes].page_start = pg;
942
943                         pg += (xfer->frlengths[nframes] / USB_PAGE_SIZE);
944                         pg += 2;
945                 }
946
947         }
948         if (info->dma_error) {
949                 USB_BUS_LOCK(info->bus);
950                 usbd_transfer_done(xfer, USB_ERR_DMA_LOAD_FAILED);
951                 USB_BUS_UNLOCK(info->bus);
952                 return;
953         }
954         if (info->dma_currframe != info->dma_nframes) {
955
956                 if (info->dma_currframe == 0) {
957                         /* special case */
958                         usb_pc_load_mem(xfer->frbuffers,
959                             info->dma_frlength_0, 0);
960                 } else {
961                         /* default case */
962                         nframes = info->dma_currframe;
963                         usb_pc_load_mem(xfer->frbuffers + nframes,
964                             xfer->frlengths[nframes], 0);
965                 }
966
967                 /* advance frame index */
968                 info->dma_currframe++;
969
970                 return;
971         }
972         /* go ahead */
973         usb_bdma_pre_sync(xfer);
974
975         /* start loading next USB transfer, if any */
976         usb_command_wrapper(pq, NULL);
977
978         /* finally start the hardware */
979         usbd_pipe_enter(xfer);
980 }
981
982 /*------------------------------------------------------------------------*
983  *      usb_bdma_done_event
984  *
985  * This function is called when the BUS-DMA has loaded virtual memory
986  * into DMA, if any.
987  *------------------------------------------------------------------------*/
988 void
989 usb_bdma_done_event(struct usb_dma_parent_tag *udpt)
990 {
991         struct usb_xfer_root *info;
992
993         info = USB_DMATAG_TO_XROOT(udpt);
994
995         mtx_assert(info->xfer_mtx, MA_OWNED);
996
997         /* copy error */
998         info->dma_error = udpt->dma_error;
999
1000         /* enter workloop again */
1001         usb_command_wrapper(&info->dma_q,
1002             info->dma_q.curr);
1003 }
1004
1005 /*------------------------------------------------------------------------*
1006  *      usb_bdma_pre_sync
1007  *
1008  * This function handles DMA synchronisation that must be done before
1009  * an USB transfer is started.
1010  *------------------------------------------------------------------------*/
1011 void
1012 usb_bdma_pre_sync(struct usb_xfer *xfer)
1013 {
1014         struct usb_page_cache *pc;
1015         usb_frcount_t nframes;
1016
1017         if (xfer->flags_int.isochronous_xfr) {
1018                 /* only one frame buffer */
1019                 nframes = 1;
1020         } else {
1021                 /* can be multiple frame buffers */
1022                 nframes = xfer->nframes;
1023         }
1024
1025         pc = xfer->frbuffers;
1026
1027         while (nframes--) {
1028
1029                 if (pc->isread) {
1030                         usb_pc_cpu_invalidate(pc);
1031                 } else {
1032                         usb_pc_cpu_flush(pc);
1033                 }
1034                 pc++;
1035         }
1036 }
1037
1038 /*------------------------------------------------------------------------*
1039  *      usb_bdma_post_sync
1040  *
1041  * This function handles DMA synchronisation that must be done after
1042  * an USB transfer is complete.
1043  *------------------------------------------------------------------------*/
1044 void
1045 usb_bdma_post_sync(struct usb_xfer *xfer)
1046 {
1047         struct usb_page_cache *pc;
1048         usb_frcount_t nframes;
1049
1050         if (xfer->flags_int.isochronous_xfr) {
1051                 /* only one frame buffer */
1052                 nframes = 1;
1053         } else {
1054                 /* can be multiple frame buffers */
1055                 nframes = xfer->nframes;
1056         }
1057
1058         pc = xfer->frbuffers;
1059
1060         while (nframes--) {
1061                 if (pc->isread) {
1062                         usb_pc_cpu_invalidate(pc);
1063                 }
1064                 pc++;
1065         }
1066 }
1067
1068 #endif