sys/dev/usb/usb_busdma.c

   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 #ifdef USB_GLOBAL_INCLUDE_FILE
  28 #include USB_GLOBAL_INCLUDE_FILE
  29 #else
  30 #include <sys/stdint.h>
  31 #include <sys/stddef.h>
  32 #include <sys/param.h>
  33 #include <sys/queue.h>
  34 #include <sys/types.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/bus.h>
  38 #include <sys/module.h>
  39 #include <sys/lock.h>
  40 #include <sys/mutex.h>
  41 #include <sys/condvar.h>
  42 #include <sys/sysctl.h>
  43 #include <sys/sx.h>
  44 #include <sys/unistd.h>
  45 #include <sys/callout.h>
  46 #include <sys/malloc.h>
  47 #include <sys/priv.h>
  48
  49 #include <dev/usb/usb.h>
  50 #include <dev/usb/usbdi.h>
  51 #include <dev/usb/usbdi_util.h>
  52
  53 #define USB_DEBUG_VAR usb_debug
  54
  55 #include <dev/usb/usb_core.h>
  56 #include <dev/usb/usb_busdma.h>
  57 #include <dev/usb/usb_process.h>
  58 #include <dev/usb/usb_transfer.h>
  59 #include <dev/usb/usb_device.h>
  60 #include <dev/usb/usb_util.h>
  61 #include <dev/usb/usb_debug.h>
  62
  63 #include <dev/usb/usb_controller.h>
  64 #include <dev/usb/usb_bus.h>
  65 #endif                  /* USB_GLOBAL_INCLUDE_FILE */
  66
  67 #if USB_HAVE_BUSDMA
  68 static void     usb_dma_tag_create(struct usb_dma_tag *, usb_size_t, usb_size_t);
  69 static void     usb_dma_tag_destroy(struct usb_dma_tag *);
  70 static void     usb_dma_lock_cb(void *, bus_dma_lock_op_t);
  71 static void     usb_pc_alloc_mem_cb(void *, bus_dma_segment_t *, int, int);
  72 static void     usb_pc_load_mem_cb(void *, bus_dma_segment_t *, int, int);
  73 static void     usb_pc_common_mem_cb(void *, bus_dma_segment_t *, int, int,
  74                     uint8_t);
  75 #endif
  76
  77 /*------------------------------------------------------------------------*
  78  *  usbd_get_page - lookup DMA-able memory for the given offset
  79  *
  80  * NOTE: Only call this function when the "page_cache" structure has
  81  * been properly initialized !
  82  *------------------------------------------------------------------------*/
  83 void
  84 usbd_get_page(struct usb_page_cache *pc, usb_frlength_t offset,
  85     struct usb_page_search *res)
  86 {
  87 #if USB_HAVE_BUSDMA
  88         struct usb_page *page;
  89
  90         if (pc->page_start) {
  91
  92                 /* Case 1 - something has been loaded into DMA */
  93
  94                 if (pc->buffer) {
  95
  96                         /* Case 1a - Kernel Virtual Address */
  97
  98                         res->buffer = USB_ADD_BYTES(pc->buffer, offset);
  99                 }
 100                 offset += pc->page_offset_buf;
 101
 102                 /* compute destination page */
 103
 104                 page = pc->page_start;
 105
 106                 if (pc->ismultiseg) {
 107
 108                         page += (offset / USB_PAGE_SIZE);
 109
 110                         offset %= USB_PAGE_SIZE;
 111
 112                         res->length = USB_PAGE_SIZE - offset;
 113                         res->physaddr = page->physaddr + offset;
 114                 } else {
 115                         res->length = (usb_size_t)-1;
 116                         res->physaddr = page->physaddr + offset;
 117                 }
 118                 if (!pc->buffer) {
 119
 120                         /* Case 1b - Non Kernel Virtual Address */
 121
 122                         res->buffer = USB_ADD_BYTES(page->buffer, offset);
 123                 }
 124                 return;
 125         }
 126 #endif
 127         /* Case 2 - Plain PIO */
 128
 129         res->buffer = USB_ADD_BYTES(pc->buffer, offset);
 130         res->length = (usb_size_t)-1;
 131 #if USB_HAVE_BUSDMA
 132         res->physaddr = 0;
 133 #endif
 134 }
 135
 136 /*------------------------------------------------------------------------*
 137  *  usbd_copy_in - copy directly to DMA-able memory
 138  *------------------------------------------------------------------------*/
 139 void
 140 usbd_copy_in(struct usb_page_cache *cache, usb_frlength_t offset,
 141     const void *ptr, usb_frlength_t len)
 142 {
 143         struct usb_page_search buf_res;
 144
 145         while (len != 0) {
 146
 147                 usbd_get_page(cache, offset, &buf_res);
 148
 149                 if (buf_res.length > len) {
 150                         buf_res.length = len;
 151                 }
 152                 memcpy(buf_res.buffer, ptr, buf_res.length);
 153
 154                 offset += buf_res.length;
 155                 len -= buf_res.length;
 156                 ptr = USB_ADD_BYTES(ptr, buf_res.length);
 157         }
 158 }
 159
 160 /*------------------------------------------------------------------------*
 161  *  usbd_copy_in_user - copy directly to DMA-able memory from userland
 162  *
 163  * Return values:
 164  *    0: Success
 165  * Else: Failure
 166  *------------------------------------------------------------------------*/
 167 #if USB_HAVE_USER_IO
 168 int
 169 usbd_copy_in_user(struct usb_page_cache *cache, usb_frlength_t offset,
 170     const void *ptr, usb_frlength_t len)
 171 {
 172         struct usb_page_search buf_res;
 173         int error;
 174
 175         while (len != 0) {
 176
 177                 usbd_get_page(cache, offset, &buf_res);
 178
 179                 if (buf_res.length > len) {
 180                         buf_res.length = len;
 181                 }
 182                 error = copyin(ptr, buf_res.buffer, buf_res.length);
 183                 if (error)
 184                         return (error);
 185
 186                 offset += buf_res.length;
 187                 len -= buf_res.length;
 188                 ptr = USB_ADD_BYTES(ptr, buf_res.length);
 189         }
 190         return (0);                     /* success */
 191 }
 192 #endif
 193
 194 /*------------------------------------------------------------------------*
 195  *  usbd_m_copy_in - copy a mbuf chain directly into DMA-able memory
 196  *------------------------------------------------------------------------*/
 197 #if USB_HAVE_MBUF
 198 struct usb_m_copy_in_arg {
 199         struct usb_page_cache *cache;
 200         usb_frlength_t dst_offset;
 201 };
 202
 203 static int
 204 usbd_m_copy_in_cb(void *arg, void *src, uint32_t count)
 205 {
 206         register struct usb_m_copy_in_arg *ua = arg;
 207
 208         usbd_copy_in(ua->cache, ua->dst_offset, src, count);
 209         ua->dst_offset += count;
 210         return (0);
 211 }
 212
 213 void
 214 usbd_m_copy_in(struct usb_page_cache *cache, usb_frlength_t dst_offset,
 215     struct mbuf *m, usb_size_t src_offset, usb_frlength_t src_len)
 216 {
 217         struct usb_m_copy_in_arg arg = {cache, dst_offset};
 218         (void) m_apply(m, src_offset, src_len, &usbd_m_copy_in_cb, &arg);
 219 }
 220 #endif
 221
 222 /*------------------------------------------------------------------------*
 223  *  usb_uiomove - factored out code
 224  *------------------------------------------------------------------------*/
 225 #if USB_HAVE_USER_IO
 226 int
 227 usb_uiomove(struct usb_page_cache *pc, struct uio *uio,
 228     usb_frlength_t pc_offset, usb_frlength_t len)
 229 {
 230         struct usb_page_search res;
 231         int error = 0;
 232
 233         while (len != 0) {
 234
 235                 usbd_get_page(pc, pc_offset, &res);
 236
 237                 if (res.length > len) {
 238                         res.length = len;
 239                 }
 240                 /*
 241                  * "uiomove()" can sleep so one needs to make a wrapper,
 242                  * exiting the mutex and checking things
 243                  */
 244                 error = uiomove(res.buffer, res.length, uio);
 245
 246                 if (error) {
 247                         break;
 248                 }
 249                 pc_offset += res.length;
 250                 len -= res.length;
 251         }
 252         return (error);
 253 }
 254 #endif
 255
 256 /*------------------------------------------------------------------------*
 257  *  usbd_copy_out - copy directly from DMA-able memory
 258  *------------------------------------------------------------------------*/
 259 void
 260 usbd_copy_out(struct usb_page_cache *cache, usb_frlength_t offset,
 261     void *ptr, usb_frlength_t len)
 262 {
 263         struct usb_page_search res;
 264
 265         while (len != 0) {
 266
 267                 usbd_get_page(cache, offset, &res);
 268
 269                 if (res.length > len) {
 270                         res.length = len;
 271                 }
 272                 memcpy(ptr, res.buffer, res.length);
 273
 274                 offset += res.length;
 275                 len -= res.length;
 276                 ptr = USB_ADD_BYTES(ptr, res.length);
 277         }
 278 }
 279
 280 /*------------------------------------------------------------------------*
 281  *  usbd_copy_out_user - copy directly from DMA-able memory to userland
 282  *
 283  * Return values:
 284  *    0: Success
 285  * Else: Failure
 286  *------------------------------------------------------------------------*/
 287 #if USB_HAVE_USER_IO
 288 int
 289 usbd_copy_out_user(struct usb_page_cache *cache, usb_frlength_t offset,
 290     void *ptr, usb_frlength_t len)
 291 {
 292         struct usb_page_search res;
 293         int error;
 294
 295         while (len != 0) {
 296
 297                 usbd_get_page(cache, offset, &res);
 298
 299                 if (res.length > len) {
 300                         res.length = len;
 301                 }
 302                 error = copyout(res.buffer, ptr, res.length);
 303                 if (error)
 304                         return (error);
 305
 306                 offset += res.length;
 307                 len -= res.length;
 308                 ptr = USB_ADD_BYTES(ptr, res.length);
 309         }
 310         return (0);                     /* success */
 311 }
 312 #endif
 313
 314 /*------------------------------------------------------------------------*
 315  *  usbd_frame_zero - zero DMA-able memory
 316  *------------------------------------------------------------------------*/
 317 void
 318 usbd_frame_zero(struct usb_page_cache *cache, usb_frlength_t offset,
 319     usb_frlength_t len)
 320 {
 321         struct usb_page_search res;
 322
 323         while (len != 0) {
 324
 325                 usbd_get_page(cache, offset, &res);
 326
 327                 if (res.length > len) {
 328                         res.length = len;
 329                 }
 330                 memset(res.buffer, 0, res.length);
 331
 332                 offset += res.length;
 333                 len -= res.length;
 334         }
 335 }
 336
 337 #if USB_HAVE_BUSDMA
 338
 339 /*------------------------------------------------------------------------*
 340  *      usb_dma_lock_cb - dummy callback
 341  *------------------------------------------------------------------------*/
 342 static void
 343 usb_dma_lock_cb(void *arg, bus_dma_lock_op_t op)
 344 {
 345         /* we use "mtx_owned()" instead of this function */
 346 }
 347
 348 /*------------------------------------------------------------------------*
 349  *      usb_dma_tag_create - allocate a DMA tag
 350  *
 351  * NOTE: If the "align" parameter has a value of 1 the DMA-tag will
 352  * allow multi-segment mappings. Else all mappings are single-segment.
 353  *------------------------------------------------------------------------*/
 354 static void
 355 usb_dma_tag_create(struct usb_dma_tag *udt,
 356     usb_size_t size, usb_size_t align)
 357 {
 358         bus_dma_tag_t tag;
 359
 360         if (bus_dma_tag_create
 361             ( /* parent    */ udt->tag_parent->tag,
 362              /* alignment */ align,
 363              /* boundary  */ 0,
 364              /* lowaddr   */ (2ULL << (udt->tag_parent->dma_bits - 1)) - 1,
 365              /* highaddr  */ BUS_SPACE_MAXADDR,
 366              /* filter    */ NULL,
 367              /* filterarg */ NULL,
 368              /* maxsize   */ size,
 369              /* nsegments */ (align == 1 && size > 1) ?
 370             (2 + (size / USB_PAGE_SIZE)) : 1,
 371              /* maxsegsz  */ (align == 1 && size > USB_PAGE_SIZE) ?
 372             USB_PAGE_SIZE : size,
 373              /* flags     */ BUS_DMA_KEEP_PG_OFFSET,
 374              /* lockfn    */ &usb_dma_lock_cb,
 375              /* lockarg   */ NULL,
 376             &tag)) {
 377                 tag = NULL;
 378         }
 379         udt->tag = tag;
 380 }
 381
 382 /*------------------------------------------------------------------------*
 383  *      usb_dma_tag_free - free a DMA tag
 384  *------------------------------------------------------------------------*/
 385 static void
 386 usb_dma_tag_destroy(struct usb_dma_tag *udt)
 387 {
 388         bus_dma_tag_destroy(udt->tag);
 389 }
 390
 391 /*------------------------------------------------------------------------*
 392  *      usb_pc_alloc_mem_cb - BUS-DMA callback function
 393  *------------------------------------------------------------------------*/
 394 static void
 395 usb_pc_alloc_mem_cb(void *arg, bus_dma_segment_t *segs,
 396     int nseg, int error)
 397 {
 398         usb_pc_common_mem_cb(arg, segs, nseg, error, 0);
 399 }
 400
 401 /*------------------------------------------------------------------------*
 402  *      usb_pc_load_mem_cb - BUS-DMA callback function
 403  *------------------------------------------------------------------------*/
 404 static void
 405 usb_pc_load_mem_cb(void *arg, bus_dma_segment_t *segs,
 406     int nseg, int error)
 407 {
 408         usb_pc_common_mem_cb(arg, segs, nseg, error, 1);
 409 }
 410
 411 /*------------------------------------------------------------------------*
 412  *      usb_pc_common_mem_cb - BUS-DMA callback function
 413  *------------------------------------------------------------------------*/
 414 static void
 415 usb_pc_common_mem_cb(void *arg, bus_dma_segment_t *segs,
 416     int nseg, int error, uint8_t isload)
 417 {
 418         struct usb_dma_parent_tag *uptag;
 419         struct usb_page_cache *pc;
 420         struct usb_page *pg;
 421         usb_size_t rem;
 422         bus_size_t off;
 423         uint8_t owned;
 424
 425         pc = arg;
 426         uptag = pc->tag_parent;
 427
 428         /*
 429          * XXX There is sometimes recursive locking here.
 430          * XXX We should try to find a better solution.
 431          * XXX Until further the "owned" variable does
 432          * XXX the trick.
 433          */
 434
 435         if (error) {
 436                 goto done;
 437         }
 438
 439         off = 0;
 440         pg = pc->page_start;
 441         pg->physaddr = segs->ds_addr & ~(USB_PAGE_SIZE - 1);
 442         rem = segs->ds_addr & (USB_PAGE_SIZE - 1);
 443         pc->page_offset_buf = rem;
 444         pc->page_offset_end += rem;
 445 #ifdef USB_DEBUG
 446         if (rem != (USB_P2U(pc->buffer) & (USB_PAGE_SIZE - 1))) {
 447                 /*
 448                  * This check verifies that the physical address is correct:
 449                  */
 450                 DPRINTFN(0, "Page offset was not preserved\n");
 451                 error = 1;
 452                 goto done;
 453         }
 454 #endif
 455         while (pc->ismultiseg) {
 456                 off += USB_PAGE_SIZE;
 457                 if (off >= (segs->ds_len + rem)) {
 458                         /* page crossing */
 459                         nseg--;
 460                         segs++;
 461                         off = 0;
 462                         rem = 0;
 463                         if (nseg == 0)
 464                                 break;
 465                 }
 466                 pg++;
 467                 pg->physaddr = (segs->ds_addr + off) & ~(USB_PAGE_SIZE - 1);
 468         }
 469
 470 done:
 471         owned = mtx_owned(uptag->mtx);
 472         if (!owned)
 473                 mtx_lock(uptag->mtx);
 474
 475         uptag->dma_error = (error ? 1 : 0);
 476         if (isload) {
 477                 (uptag->func) (uptag);
 478         } else {
 479                 cv_broadcast(uptag->cv);
 480         }
 481         if (!owned)
 482                 mtx_unlock(uptag->mtx);
 483 }
 484
 485 /*------------------------------------------------------------------------*
 486  *      usb_pc_alloc_mem - allocate DMA'able memory
 487  *
 488  * Returns:
 489  *    0: Success
 490  * Else: Failure
 491  *------------------------------------------------------------------------*/
 492 uint8_t
 493 usb_pc_alloc_mem(struct usb_page_cache *pc, struct usb_page *pg,
 494     usb_size_t size, usb_size_t align)
 495 {
 496         struct usb_dma_parent_tag *uptag;
 497         struct usb_dma_tag *utag;
 498         bus_dmamap_t map;
 499         void *ptr;
 500         int err;
 501
 502         uptag = pc->tag_parent;
 503
 504         if (align != 1) {
 505                 /*
 506                  * The alignment must be greater or equal to the
 507                  * "size" else the object can be split between two
 508                  * memory pages and we get a problem!
 509                  */
 510                 while (align < size) {
 511                         align *= 2;
 512                         if (align == 0) {
 513                                 goto error;
 514                         }
 515                 }
 516 #if 1
 517                 /*
 518                  * XXX BUS-DMA workaround - FIXME later:
 519                  *
 520                  * We assume that that the aligment at this point of
 521                  * the code is greater than or equal to the size and
 522                  * less than two times the size, so that if we double
 523                  * the size, the size will be greater than the
 524                  * alignment.
 525                  *
 526                  * The bus-dma system has a check for "alignment"
 527                  * being less than "size". If that check fails we end
 528                  * up using contigmalloc which is page based even for
 529                  * small allocations. Try to avoid that to save
 530                  * memory, hence we sometimes to a large number of
 531                  * small allocations!
 532                  */
 533                 if (size <= (USB_PAGE_SIZE / 2)) {
 534                         size *= 2;
 535                 }
 536 #endif
 537         }
 538         /* get the correct DMA tag */
 539         utag = usb_dma_tag_find(uptag, size, align);
 540         if (utag == NULL) {
 541                 goto error;
 542         }
 543         /* allocate memory */
 544         if (bus_dmamem_alloc(
 545             utag->tag, &ptr, (BUS_DMA_WAITOK | BUS_DMA_COHERENT), &map)) {
 546                 goto error;
 547         }
 548         /* setup page cache */
 549         pc->buffer = ptr;
 550         pc->page_start = pg;
 551         pc->page_offset_buf = 0;
 552         pc->page_offset_end = size;
 553         pc->map = map;
 554         pc->tag = utag->tag;
 555         pc->ismultiseg = (align == 1);
 556
 557         mtx_lock(uptag->mtx);
 558
 559         /* load memory into DMA */
 560         err = bus_dmamap_load(
 561             utag->tag, map, ptr, size, &usb_pc_alloc_mem_cb,
 562             pc, (BUS_DMA_WAITOK | BUS_DMA_COHERENT));
 563
 564         if (err == EINPROGRESS) {
 565                 cv_wait(uptag->cv, uptag->mtx);
 566                 err = 0;
 567         }
 568         mtx_unlock(uptag->mtx);
 569
 570         if (err || uptag->dma_error) {
 571                 bus_dmamem_free(utag->tag, ptr, map);
 572                 goto error;
 573         }
 574         memset(ptr, 0, size);
 575
 576         usb_pc_cpu_flush(pc);
 577
 578         return (0);
 579
 580 error:
 581         /* reset most of the page cache */
 582         pc->buffer = NULL;
 583         pc->page_start = NULL;
 584         pc->page_offset_buf = 0;
 585         pc->page_offset_end = 0;
 586         pc->map = NULL;
 587         pc->tag = NULL;
 588         return (1);
 589 }
 590
 591 /*------------------------------------------------------------------------*
 592  *      usb_pc_free_mem - free DMA memory
 593  *
 594  * This function is NULL safe.
 595  *------------------------------------------------------------------------*/
 596 void
 597 usb_pc_free_mem(struct usb_page_cache *pc)
 598 {
 599         if (pc && pc->buffer) {
 600
 601                 bus_dmamap_unload(pc->tag, pc->map);
 602
 603                 bus_dmamem_free(pc->tag, pc->buffer, pc->map);
 604
 605                 pc->buffer = NULL;
 606         }
 607 }
 608
 609 /*------------------------------------------------------------------------*
 610  *      usb_pc_load_mem - load virtual memory into DMA
 611  *
 612  * Return values:
 613  * 0: Success
 614  * Else: Error
 615  *------------------------------------------------------------------------*/
 616 uint8_t
 617 usb_pc_load_mem(struct usb_page_cache *pc, usb_size_t size, uint8_t sync)
 618 {
 619         /* setup page cache */
 620         pc->page_offset_buf = 0;
 621         pc->page_offset_end = size;
 622         pc->ismultiseg = 1;
 623
 624         mtx_assert(pc->tag_parent->mtx, MA_OWNED);
 625
 626         if (size > 0) {
 627                 if (sync) {
 628                         struct usb_dma_parent_tag *uptag;
 629                         int err;
 630
 631                         uptag = pc->tag_parent;
 632
 633                         /*
 634                          * We have to unload the previous loaded DMA
 635                          * pages before trying to load a new one!
 636                          */
 637                         bus_dmamap_unload(pc->tag, pc->map);
 638
 639                         /*
 640                          * Try to load memory into DMA.
 641                          */
 642                         err = bus_dmamap_load(
 643                             pc->tag, pc->map, pc->buffer, size,
 644                             &usb_pc_alloc_mem_cb, pc, BUS_DMA_WAITOK);
 645                         if (err == EINPROGRESS) {
 646                                 cv_wait(uptag->cv, uptag->mtx);
 647                                 err = 0;
 648                         }
 649                         if (err || uptag->dma_error) {
 650                                 return (1);
 651                         }
 652                 } else {
 653
 654                         /*
 655                          * We have to unload the previous loaded DMA
 656                          * pages before trying to load a new one!
 657                          */
 658                         bus_dmamap_unload(pc->tag, pc->map);
 659
 660                         /*
 661                          * Try to load memory into DMA. The callback
 662                          * will be called in all cases:
 663                          */
 664                         if (bus_dmamap_load(
 665                             pc->tag, pc->map, pc->buffer, size,
 666                             &usb_pc_load_mem_cb, pc, BUS_DMA_WAITOK)) {
 667                         }
 668                 }
 669         } else {
 670                 if (!sync) {
 671                         /*
 672                          * Call callback so that refcount is decremented
 673                          * properly:
 674                          */
 675                         pc->tag_parent->dma_error = 0;
 676                         (pc->tag_parent->func) (pc->tag_parent);
 677                 }
 678         }
 679         return (0);
 680 }
 681
 682 /*------------------------------------------------------------------------*
 683  *      usb_pc_cpu_invalidate - invalidate CPU cache
 684  *------------------------------------------------------------------------*/
 685 void
 686 usb_pc_cpu_invalidate(struct usb_page_cache *pc)
 687 {
 688         if (pc->page_offset_end == pc->page_offset_buf) {
 689                 /* nothing has been loaded into this page cache! */
 690                 return;
 691         }
 692
 693         /*
 694          * TODO: We currently do XXX_POSTREAD and XXX_PREREAD at the
 695          * same time, but in the future we should try to isolate the
 696          * different cases to optimise the code. --HPS
 697          */
 698         bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_POSTREAD);
 699         bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREREAD);
 700 }
 701
 702 /*------------------------------------------------------------------------*
 703  *      usb_pc_cpu_flush - flush CPU cache
 704  *------------------------------------------------------------------------*/
 705 void
 706 usb_pc_cpu_flush(struct usb_page_cache *pc)
 707 {
 708         if (pc->page_offset_end == pc->page_offset_buf) {
 709                 /* nothing has been loaded into this page cache! */
 710                 return;
 711         }
 712         bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREWRITE);
 713 }
 714
 715 /*------------------------------------------------------------------------*
 716  *      usb_pc_dmamap_create - create a DMA map
 717  *
 718  * Returns:
 719  *    0: Success
 720  * Else: Failure
 721  *------------------------------------------------------------------------*/
 722 uint8_t
 723 usb_pc_dmamap_create(struct usb_page_cache *pc, usb_size_t size)
 724 {
 725         struct usb_xfer_root *info;
 726         struct usb_dma_tag *utag;
 727
 728         /* get info */
 729         info = USB_DMATAG_TO_XROOT(pc->tag_parent);
 730
 731         /* sanity check */
 732         if (info == NULL) {
 733                 goto error;
 734         }
 735         utag = usb_dma_tag_find(pc->tag_parent, size, 1);
 736         if (utag == NULL) {
 737                 goto error;
 738         }
 739         /* create DMA map */
 740         if (bus_dmamap_create(utag->tag, 0, &pc->map)) {
 741                 goto error;
 742         }
 743         pc->tag = utag->tag;
 744         return 0;                       /* success */
 745
 746 error:
 747         pc->map = NULL;
 748         pc->tag = NULL;
 749         return 1;                       /* failure */
 750 }
 751
 752 /*------------------------------------------------------------------------*
 753  *      usb_pc_dmamap_destroy
 754  *
 755  * This function is NULL safe.
 756  *------------------------------------------------------------------------*/
 757 void
 758 usb_pc_dmamap_destroy(struct usb_page_cache *pc)
 759 {
 760         if (pc && pc->tag) {
 761                 bus_dmamap_destroy(pc->tag, pc->map);
 762                 pc->tag = NULL;
 763                 pc->map = NULL;
 764         }
 765 }
 766
 767 /*------------------------------------------------------------------------*
 768  *      usb_dma_tag_find - factored out code
 769  *------------------------------------------------------------------------*/
 770 struct usb_dma_tag *
 771 usb_dma_tag_find(struct usb_dma_parent_tag *udpt,
 772     usb_size_t size, usb_size_t align)
 773 {
 774         struct usb_dma_tag *udt;
 775         uint8_t nudt;
 776
 777         USB_ASSERT(align > 0, ("Invalid parameter align = 0\n"));
 778         USB_ASSERT(size > 0, ("Invalid parameter size = 0\n"));
 779
 780         udt = udpt->utag_first;
 781         nudt = udpt->utag_max;
 782
 783         while (nudt--) {
 784
 785                 if (udt->align == 0) {
 786                         usb_dma_tag_create(udt, size, align);
 787                         if (udt->tag == NULL) {
 788                                 return (NULL);
 789                         }
 790                         udt->align = align;
 791                         udt->size = size;
 792                         return (udt);
 793                 }
 794                 if ((udt->align == align) && (udt->size == size)) {
 795                         return (udt);
 796                 }
 797                 udt++;
 798         }
 799         return (NULL);
 800 }
 801
 802 /*------------------------------------------------------------------------*
 803  *      usb_dma_tag_setup - initialise USB DMA tags
 804  *------------------------------------------------------------------------*/
 805 void
 806 usb_dma_tag_setup(struct usb_dma_parent_tag *udpt,
 807     struct usb_dma_tag *udt, bus_dma_tag_t dmat,
 808     struct mtx *mtx, usb_dma_callback_t *func,
 809     uint8_t ndmabits, uint8_t nudt)
 810 {
 811         memset(udpt, 0, sizeof(*udpt));
 812
 813         /* sanity checking */
 814         if ((nudt == 0) ||
 815             (ndmabits == 0) ||
 816             (mtx == NULL)) {
 817                 /* something is corrupt */
 818                 return;
 819         }
 820         /* initialise condition variable */
 821         cv_init(udpt->cv, "USB DMA CV");
 822
 823         /* store some information */
 824         udpt->mtx = mtx;
 825         udpt->func = func;
 826         udpt->tag = dmat;
 827         udpt->utag_first = udt;
 828         udpt->utag_max = nudt;
 829         udpt->dma_bits = ndmabits;
 830
 831         while (nudt--) {
 832                 memset(udt, 0, sizeof(*udt));
 833                 udt->tag_parent = udpt;
 834                 udt++;
 835         }
 836 }
 837
 838 /*------------------------------------------------------------------------*
 839  *      usb_bus_tag_unsetup - factored out code
 840  *------------------------------------------------------------------------*/
 841 void
 842 usb_dma_tag_unsetup(struct usb_dma_parent_tag *udpt)
 843 {
 844         struct usb_dma_tag *udt;
 845         uint8_t nudt;
 846
 847         udt = udpt->utag_first;
 848         nudt = udpt->utag_max;
 849
 850         while (nudt--) {
 851
 852                 if (udt->align) {
 853                         /* destroy the USB DMA tag */
 854                         usb_dma_tag_destroy(udt);
 855                         udt->align = 0;
 856                 }
 857                 udt++;
 858         }
 859
 860         if (udpt->utag_max) {
 861                 /* destroy the condition variable */
 862                 cv_destroy(udpt->cv);
 863         }
 864 }
 865
 866 /*------------------------------------------------------------------------*
 867  *      usb_bdma_work_loop
 868  *
 869  * This function handles loading of virtual buffers into DMA and is
 870  * only called when "dma_refcount" is zero.
 871  *------------------------------------------------------------------------*/
 872 void
 873 usb_bdma_work_loop(struct usb_xfer_queue *pq)
 874 {
 875         struct usb_xfer_root *info;
 876         struct usb_xfer *xfer;
 877         usb_frcount_t nframes;
 878
 879         xfer = pq->curr;
 880         info = xfer->xroot;
 881
 882         mtx_assert(info->xfer_mtx, MA_OWNED);
 883
 884         if (xfer->error) {
 885                 /* some error happened */
 886                 USB_BUS_LOCK(info->bus);
 887                 usbd_transfer_done(xfer, 0);
 888                 USB_BUS_UNLOCK(info->bus);
 889                 return;
 890         }
 891         if (!xfer->flags_int.bdma_setup) {
 892                 struct usb_page *pg;
 893                 usb_frlength_t frlength_0;
 894                 uint8_t isread;
 895
 896                 xfer->flags_int.bdma_setup = 1;
 897
 898                 /* reset BUS-DMA load state */
 899
 900                 info->dma_error = 0;
 901
 902                 if (xfer->flags_int.isochronous_xfr) {
 903                         /* only one frame buffer */
 904                         nframes = 1;
 905                         frlength_0 = xfer->sumlen;
 906                 } else {
 907                         /* can be multiple frame buffers */
 908                         nframes = xfer->nframes;
 909                         frlength_0 = xfer->frlengths[0];
 910                 }
 911
 912                 /*
 913                  * Set DMA direction first. This is needed to
 914                  * select the correct cache invalidate and cache
 915                  * flush operations.
 916                  */
 917                 isread = USB_GET_DATA_ISREAD(xfer);
 918                 pg = xfer->dma_page_ptr;
 919
 920                 if (xfer->flags_int.control_xfr &&
 921                     xfer->flags_int.control_hdr) {
 922                         /* special case */
 923                         if (xfer->flags_int.usb_mode == USB_MODE_DEVICE) {
 924                                 /* The device controller writes to memory */
 925                                 xfer->frbuffers[0].isread = 1;
 926                         } else {
 927                                 /* The host controller reads from memory */
 928                                 xfer->frbuffers[0].isread = 0;
 929                         }
 930                 } else {
 931                         /* default case */
 932                         xfer->frbuffers[0].isread = isread;
 933                 }
 934
 935                 /*
 936                  * Setup the "page_start" pointer which points to an array of
 937                  * USB pages where information about the physical address of a
 938                  * page will be stored. Also initialise the "isread" field of
 939                  * the USB page caches.
 940                  */
 941                 xfer->frbuffers[0].page_start = pg;
 942
 943                 info->dma_nframes = nframes;
 944                 info->dma_currframe = 0;
 945                 info->dma_frlength_0 = frlength_0;
 946
 947                 pg += (frlength_0 / USB_PAGE_SIZE);
 948                 pg += 2;
 949
 950                 while (--nframes > 0) {
 951                         xfer->frbuffers[nframes].isread = isread;
 952                         xfer->frbuffers[nframes].page_start = pg;
 953
 954                         pg += (xfer->frlengths[nframes] / USB_PAGE_SIZE);
 955                         pg += 2;
 956                 }
 957
 958         }
 959         if (info->dma_error) {
 960                 USB_BUS_LOCK(info->bus);
 961                 usbd_transfer_done(xfer, USB_ERR_DMA_LOAD_FAILED);
 962                 USB_BUS_UNLOCK(info->bus);
 963                 return;
 964         }
 965         if (info->dma_currframe != info->dma_nframes) {
 966
 967                 if (info->dma_currframe == 0) {
 968                         /* special case */
 969                         usb_pc_load_mem(xfer->frbuffers,
 970                             info->dma_frlength_0, 0);
 971                 } else {
 972                         /* default case */
 973                         nframes = info->dma_currframe;
 974                         usb_pc_load_mem(xfer->frbuffers + nframes,
 975                             xfer->frlengths[nframes], 0);
 976                 }
 977
 978                 /* advance frame index */
 979                 info->dma_currframe++;
 980
 981                 return;
 982         }
 983         /* go ahead */
 984         usb_bdma_pre_sync(xfer);
 985
 986         /* start loading next USB transfer, if any */
 987         usb_command_wrapper(pq, NULL);
 988
 989         /* finally start the hardware */
 990         usbd_pipe_enter(xfer);
 991 }
 992
 993 /*------------------------------------------------------------------------*
 994  *      usb_bdma_done_event
 995  *
 996  * This function is called when the BUS-DMA has loaded virtual memory
 997  * into DMA, if any.
 998  *------------------------------------------------------------------------*/
 999 void
1000 usb_bdma_done_event(struct usb_dma_parent_tag *udpt)
1001 {
1002         struct usb_xfer_root *info;
1003
1004         info = USB_DMATAG_TO_XROOT(udpt);
1005
1006         mtx_assert(info->xfer_mtx, MA_OWNED);
1007
1008         /* copy error */
1009         info->dma_error = udpt->dma_error;
1010
1011         /* enter workloop again */
1012         usb_command_wrapper(&info->dma_q,
1013             info->dma_q.curr);
1014 }
1015
1016 /*------------------------------------------------------------------------*
1017  *      usb_bdma_pre_sync
1018  *
1019  * This function handles DMA synchronisation that must be done before
1020  * an USB transfer is started.
1021  *------------------------------------------------------------------------*/
1022 void
1023 usb_bdma_pre_sync(struct usb_xfer *xfer)
1024 {
1025         struct usb_page_cache *pc;
1026         usb_frcount_t nframes;
1027
1028         if (xfer->flags_int.isochronous_xfr) {
1029                 /* only one frame buffer */
1030                 nframes = 1;
1031         } else {
1032                 /* can be multiple frame buffers */
1033                 nframes = xfer->nframes;
1034         }
1035
1036         pc = xfer->frbuffers;
1037
1038         while (nframes--) {
1039
1040                 if (pc->isread) {
1041                         usb_pc_cpu_invalidate(pc);
1042                 } else {
1043                         usb_pc_cpu_flush(pc);
1044                 }
1045                 pc++;
1046         }
1047 }
1048
1049 /*------------------------------------------------------------------------*
1050  *      usb_bdma_post_sync
1051  *
1052  * This function handles DMA synchronisation that must be done after
1053  * an USB transfer is complete.
1054  *------------------------------------------------------------------------*/
1055 void
1056 usb_bdma_post_sync(struct usb_xfer *xfer)
1057 {
1058         struct usb_page_cache *pc;
1059         usb_frcount_t nframes;
1060
1061         if (xfer->flags_int.isochronous_xfr) {
1062                 /* only one frame buffer */
1063                 nframes = 1;
1064         } else {
1065                 /* can be multiple frame buffers */
1066                 nframes = xfer->nframes;
1067         }
1068
1069         pc = xfer->frbuffers;
1070
1071         while (nframes--) {
1072                 if (pc->isread) {
1073                         usb_pc_cpu_invalidate(pc);
1074                 }
1075                 pc++;
1076         }
1077 }
1078
1079 #endif