intio.c revision 1.1.2.7
1 /* $NetBSD: intio.c,v 1.1.2.7 1999/03/12 15:13:37 minoura Exp $ */ 2 3 /* 4 * 5 * Copyright (c) 1998 NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Charles D. Cranor and 19 * Washington University. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * NetBSD/x68k internal I/O virtual bus. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/device.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/extent.h> 45 #include <vm/vm.h> 46 47 #include <machine/bus.h> 48 #include <machine/cpu.h> 49 #include <machine/frame.h> 50 51 #include <arch/x68k/dev/intiovar.h> 52 #include <arch/x68k/dev/mfp.h> 53 54 55 /* 56 * bus_space(9) interface 57 */ 58 static int intio_bus_space_map __P((bus_space_tag_t, bus_addr_t, bus_size_t, int, bus_space_handle_t *)); 59 static void intio_bus_space_unmap __P((bus_space_tag_t, bus_space_handle_t, bus_size_t)); 60 static int intio_bus_space_subregion __P((bus_space_tag_t, bus_space_handle_t, bus_size_t, bus_size_t, bus_space_handle_t *)); 61 62 static struct x68k_bus_space intio_bus = { 63 #if 0 64 X68K_INTIO_BUS, 65 #endif 66 intio_bus_space_map, intio_bus_space_unmap, intio_bus_space_subregion, 67 x68k_bus_space_alloc, x68k_bus_space_free, 68 #if 0 69 x68k_bus_space_barrier, 70 #endif 71 x68k_bus_space_read_1, x68k_bus_space_read_2, x68k_bus_space_read_4, 72 x68k_bus_space_read_multi_1, x68k_bus_space_read_multi_2, 73 x68k_bus_space_read_multi_4, 74 x68k_bus_space_read_region_1, x68k_bus_space_read_region_2, 75 x68k_bus_space_read_region_4, 76 77 x68k_bus_space_write_1, x68k_bus_space_write_2, x68k_bus_space_write_4, 78 x68k_bus_space_write_multi_1, x68k_bus_space_write_multi_2, 79 x68k_bus_space_write_multi_4, 80 x68k_bus_space_write_region_1, x68k_bus_space_write_region_2, 81 x68k_bus_space_write_region_4, 82 83 x68k_bus_space_set_region_1, x68k_bus_space_set_region_2, 84 x68k_bus_space_set_region_4, 85 x68k_bus_space_copy_region_1, x68k_bus_space_copy_region_2, 86 x68k_bus_space_copy_region_4, 87 88 0 89 }; 90 91 /* 92 * bus_dma(9) interface 93 */ 94 #define INTIO_DMA_BOUNCE_THRESHOLD (16 * 1024 * 1024) 95 int _intio_bus_dmamap_create __P((bus_dma_tag_t, bus_size_t, int, 96 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 97 void _intio_bus_dmamap_destroy __P((bus_dma_tag_t, bus_dmamap_t)); 98 int _intio_bus_dmamap_load __P((bus_dma_tag_t, bus_dmamap_t, void *, 99 bus_size_t, struct proc *, int)); 100 int _intio_bus_dmamap_load_mbuf __P((bus_dma_tag_t, bus_dmamap_t, 101 struct mbuf *, int)); 102 int _intio_bus_dmamap_load_uio __P((bus_dma_tag_t, bus_dmamap_t, 103 struct uio *, int)); 104 int _intio_bus_dmamap_load_raw __P((bus_dma_tag_t, bus_dmamap_t, 105 bus_dma_segment_t *, int, bus_size_t, int)); 106 void _intio_bus_dmamap_unload __P((bus_dma_tag_t, bus_dmamap_t)); 107 void _intio_bus_dmamap_sync __P((bus_dma_tag_t, bus_dmamap_t, 108 bus_addr_t, bus_size_t, int)); 109 110 int _intio_bus_dmamem_alloc __P((bus_dma_tag_t, bus_size_t, bus_size_t, 111 bus_size_t, bus_dma_segment_t *, int, int *, int)); 112 113 int _intio_dma_alloc_bouncebuf __P((bus_dma_tag_t, bus_dmamap_t, 114 bus_size_t, int)); 115 void _intio_dma_free_bouncebuf __P((bus_dma_tag_t, bus_dmamap_t)); 116 117 struct x68k_bus_dma intio_bus_dma = { 118 INTIO_DMA_BOUNCE_THRESHOLD, 119 _intio_bus_dmamap_create, 120 _intio_bus_dmamap_destroy, 121 _intio_bus_dmamap_load, 122 _intio_bus_dmamap_load_mbuf, 123 _intio_bus_dmamap_load_uio, 124 _intio_bus_dmamap_load_raw, 125 _intio_bus_dmamap_unload, 126 _intio_bus_dmamap_sync, 127 _intio_bus_dmamem_alloc, 128 x68k_bus_dmamem_free, 129 x68k_bus_dmamem_map, 130 x68k_bus_dmamem_unmap, 131 x68k_bus_dmamem_mmap, 132 }; 133 134 /* 135 * autoconf stuff 136 */ 137 static int intio_match __P((struct device *, struct cfdata *, void *)); 138 static void intio_attach __P((struct device *, struct device *, void *)); 139 static int intio_search __P((struct device *, struct cfdata *cf, void *)); 140 static int intio_print __P((void *, const char *)); 141 static void intio_alloc_system_ports __P((struct intio_softc*)); 142 143 struct cfattach intio_ca = { 144 sizeof(struct intio_softc), intio_match, intio_attach 145 }; 146 147 static struct intio_interrupt_vector { 148 intio_intr_handler_t iiv_handler; 149 void *iiv_arg; 150 int iiv_intrcntoff; 151 } iiv[256] = {0,}; 152 153 extern struct cfdriver intio_cd; 154 155 /* used in console initialization */ 156 extern int x68k_realconfig; 157 int x68k_config_found __P((struct cfdata *, struct device *, 158 void *, cfprint_t)); 159 static struct cfdata *cfdata_intiobus = NULL; 160 161 /* other static functions */ 162 static int scan_intrnames __P((const char *)); 163 164 static int 165 intio_match(parent, cf, aux) 166 struct device *parent; 167 struct cfdata *cf; 168 void *aux; /* NULL */ 169 { 170 if (strcmp(aux, intio_cd.cd_name) != 0) 171 return (0); 172 if (cf->cf_unit != 0) 173 return (0); 174 if (x68k_realconfig == 0) 175 cfdata_intiobus = cf; /* XXX */ 176 177 return (1); 178 } 179 180 181 /* used in console initialization: configure only MFP */ 182 static struct intio_attach_args initial_ia = { 183 &intio_bus, 184 0/*XXX*/, 185 186 "mfp", /* ia_name */ 187 MFP_ADDR, /* ia_addr */ 188 MFP_INTR, /* ia_intr */ 189 -1 /* ia_dma */ 190 -1, /* ia_dmaintr */ 191 }; 192 193 static void 194 intio_attach(parent, self, aux) 195 struct device *parent, *self; 196 void *aux; /* NULL */ 197 { 198 struct intio_softc *sc = (struct intio_softc *)self; 199 struct intio_attach_args ia; 200 201 if (self == NULL) { 202 /* console only init */ 203 x68k_config_found(cfdata_intiobus, NULL, &initial_ia, NULL); 204 return; 205 } 206 207 printf (" mapped at %08p\n", intiobase); 208 209 sc->sc_map = extent_create("intiomap", 210 PHYS_INTIODEV, 211 PHYS_INTIODEV + 0x400000, 212 M_DEVBUF, NULL, NULL, EX_NOWAIT); 213 intio_alloc_system_ports (sc); 214 215 sc->sc_bst = &intio_bus; 216 sc->sc_bst->x68k_bus_device = self; 217 sc->sc_dmat = &intio_bus_dma; 218 sc->sc_dmac = 0; 219 220 bzero(iiv, sizeof (struct intio_interrupt_vector) * 256); 221 222 ia.ia_bst = sc->sc_bst; 223 ia.ia_dmat = sc->sc_dmat; 224 225 config_search (intio_search, self, &ia); 226 } 227 228 static int 229 intio_search(parent, cf, aux) 230 struct device *parent; 231 struct cfdata *cf; 232 void *aux; 233 { 234 struct intio_attach_args *ia = aux; 235 struct intio_softc *sc = (struct intio_softc *)parent; 236 237 ia->ia_bst = sc->sc_bst; 238 ia->ia_dmat = sc->sc_dmat; 239 ia->ia_name = cf->cf_driver->cd_name; 240 ia->ia_addr = cf->cf_addr; 241 ia->ia_intr = cf->cf_intr; 242 ia->ia_dma = cf->cf_dma; 243 ia->ia_dmaintr = cf->cf_dmaintr; 244 245 if ((*cf->cf_attach->ca_match)(parent, cf, ia) > 0) 246 config_attach(parent, cf, ia, intio_print); 247 248 return (0); 249 } 250 251 static int 252 intio_print(aux, name) 253 void *aux; 254 const char *name; 255 { 256 struct intio_attach_args *ia = aux; 257 258 /* if (ia->ia_addr > 0) */ 259 printf (" addr 0x%06x", ia->ia_addr); 260 if (ia->ia_intr > 0) 261 printf (" intr 0x%02x", ia->ia_intr); 262 if (ia->ia_dma >= 0) { 263 printf (" using DMA ch%d", ia->ia_dma); 264 if (ia->ia_dmaintr > 0) 265 printf (" intr 0x%02x and 0x%02x", 266 ia->ia_dmaintr, ia->ia_dmaintr+1); 267 } 268 269 return (QUIET); 270 } 271 272 /* 273 * intio memory map manager 274 */ 275 276 int 277 intio_map_allocate_region(parent, ia, flag) 278 struct device *parent; 279 struct intio_attach_args *ia; 280 enum intio_map_flag flag; /* INTIO_MAP_TESTONLY or INTIO_MAP_ALLOCATE */ 281 { 282 struct intio_softc *sc = (struct intio_softc*) parent; 283 struct extent *map = sc->sc_map; 284 int r; 285 286 r = extent_alloc_region (map, ia->ia_addr, ia->ia_size, 0); 287 #ifdef DEBUG 288 extent_print (map); 289 #endif 290 if (r == 0) { 291 if (flag != INTIO_MAP_ALLOCATE) 292 extent_free (map, ia->ia_addr, ia->ia_size, 0); 293 return 0; 294 } 295 296 return -1; 297 } 298 299 int 300 intio_map_free_region(parent, ia) 301 struct device *parent; 302 struct intio_attach_args *ia; 303 { 304 struct intio_softc *sc = (struct intio_softc*) parent; 305 struct extent *map = sc->sc_map; 306 307 extent_free (map, ia->ia_addr, ia->ia_size, 0); 308 #ifdef DEBUG 309 extent_print (map); 310 #endif 311 return 0; 312 } 313 314 void 315 intio_alloc_system_ports(sc) 316 struct intio_softc *sc; 317 { 318 extent_alloc_region (sc->sc_map, INTIO_SYSPORT, 16, 0); 319 extent_alloc_region (sc->sc_map, INTIO_SICILIAN, 0x2000, 0); 320 } 321 322 323 /* 324 * intio bus space stuff. 325 */ 326 static int 327 intio_bus_space_map(t, bpa, size, flags, bshp) 328 bus_space_tag_t t; 329 bus_addr_t bpa; 330 bus_size_t size; 331 int flags; 332 bus_space_handle_t *bshp; 333 { 334 /* 335 * Intio bus is mapped permanently. 336 */ 337 *bshp = (bus_space_handle_t) 338 ((u_int) bpa - PHYS_INTIODEV + intiobase); 339 /* 340 * Some devices are mapped on odd addresses only. 341 */ 342 if (flags & BUS_SPACE_MAP_SHIFTED) 343 *bshp += 0x80000001; 344 345 return (0); 346 } 347 348 static void 349 intio_bus_space_unmap(t, bsh, size) 350 bus_space_tag_t t; 351 bus_space_handle_t bsh; 352 bus_size_t size; 353 { 354 return; 355 } 356 357 static int 358 intio_bus_space_subregion(t, bsh, offset, size, nbshp) 359 bus_space_tag_t t; 360 bus_space_handle_t bsh; 361 bus_size_t offset, size; 362 bus_space_handle_t *nbshp; 363 { 364 365 *nbshp = bsh + offset; 366 return (0); 367 } 368 369 370 /* 371 * interrupt handler 372 */ 373 int 374 intio_intr_establish (vector, name, handler, arg) 375 int vector; 376 const char *name; /* XXX */ 377 intio_intr_handler_t handler; 378 void *arg; 379 { 380 if (vector < 16) 381 panic ("Invalid interrupt vector"); 382 if (iiv[vector].iiv_handler) 383 return EBUSY; 384 iiv[vector].iiv_handler = handler; 385 iiv[vector].iiv_arg = arg; 386 iiv[vector].iiv_intrcntoff = scan_intrnames(name); 387 388 return 0; 389 } 390 391 static int 392 scan_intrnames (name) 393 const char *name; 394 { 395 extern char intrnames[]; 396 extern char eintrnames[]; 397 int r = 0; 398 char *p = &intrnames[0]; 399 400 for (;;) { 401 if (*p == 0) { /* new intr */ 402 if (p + strlen(name) >= eintrnames) 403 panic ("Interrupt statics buffer overrun."); 404 strcpy (p, name); 405 break; 406 } 407 if (strcmp(p, name) == 0) 408 break; 409 r++; 410 while (*p++ != 0); 411 } 412 413 return r; 414 } 415 416 int 417 intio_intr_disestablish (vector, arg) 418 int vector; 419 void *arg; 420 { 421 if (iiv[vector].iiv_handler == 0 || iiv[vector].iiv_arg != arg) 422 return EINVAL; 423 iiv[vector].iiv_handler = 0; 424 iiv[vector].iiv_arg = 0; 425 426 return 0; 427 } 428 429 int 430 intio_intr (frame) 431 struct frame *frame; 432 { 433 int vector = frame->f_vector / 4; 434 extern int intrcnt[]; 435 436 #if 0 /* this is not correct now */ 437 /* CAUTION: HERE WE ARE IN SPLHIGH() */ 438 /* LOWER TO APPROPRIATE IPL AT VERY FIRST IN THE HANDLER!! */ 439 #endif 440 if (iiv[vector].iiv_handler == 0) { 441 printf ("Stray interrupt: %d type %x\n", vector, frame->f_format); 442 return 0; 443 } 444 445 intrcnt[iiv[vector].iiv_intrcntoff]++; 446 447 return (*(iiv[vector].iiv_handler)) (iiv[vector].iiv_arg); 448 } 449 450 /* 451 * Intio I/O controler interrupt 452 */ 453 static intio_ivec = 0; 454 void 455 intio_set_ivec (vec) 456 int vec; 457 { 458 vec &= 0xfc; 459 460 if (intio_ivec && intio_ivec != (vec & 0xfc)) 461 panic ("Wrong interrupt vector for Sicilian."); 462 463 intio_ivec = vec; 464 intio_set_sicilian_ivec(vec); 465 } 466 467 468 /* 469 * intio bus dma stuff. stolen from arch/i386/isa/isa_machdep.c 470 */ 471 472 /* 473 * Create an INTIO DMA map. 474 */ 475 int 476 _intio_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp) 477 bus_dma_tag_t t; 478 bus_size_t size; 479 int nsegments; 480 bus_size_t maxsegsz; 481 bus_size_t boundary; 482 int flags; 483 bus_dmamap_t *dmamp; 484 { 485 struct intio_dma_cookie *cookie; 486 bus_dmamap_t map; 487 int error, cookieflags; 488 void *cookiestore; 489 size_t cookiesize; 490 extern paddr_t avail_end; 491 492 /* Call common function to create the basic map. */ 493 error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 494 flags, dmamp); 495 if (error) 496 return (error); 497 498 map = *dmamp; 499 map->x68k_dm_cookie = NULL; 500 501 cookiesize = sizeof(struct intio_dma_cookie); 502 503 /* 504 * INTIO only has 24-bits of address space. This means 505 * we can't DMA to pages over 16M. In order to DMA to 506 * arbitrary buffers, we use "bounce buffers" - pages 507 * in memory below the 16M boundary. On DMA reads, 508 * DMA happens to the bounce buffers, and is copied into 509 * the caller's buffer. On writes, data is copied into 510 * but bounce buffer, and the DMA happens from those 511 * pages. To software using the DMA mapping interface, 512 * this looks simply like a data cache. 513 * 514 * If we have more than 16M of RAM in the system, we may 515 * need bounce buffers. We check and remember that here. 516 * 517 * ...or, there is an opposite case. The most segments 518 * a transfer will require is (maxxfer / NBPG) + 1. If 519 * the caller can't handle that many segments (e.g. the 520 * DMAC), we may have to bounce it as well. 521 */ 522 if (avail_end <= t->_bounce_thresh) 523 /* Bouncing not necessary due to memory size. */ 524 map->x68k_dm_bounce_thresh = 0; 525 cookieflags = 0; 526 if (map->x68k_dm_bounce_thresh != 0 || 527 ((map->x68k_dm_size / NBPG) + 1) > map->x68k_dm_segcnt) { 528 cookieflags |= ID_MIGHT_NEED_BOUNCE; 529 cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt); 530 } 531 532 /* 533 * Allocate our cookie. 534 */ 535 if ((cookiestore = malloc(cookiesize, M_DMAMAP, 536 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL) { 537 error = ENOMEM; 538 goto out; 539 } 540 memset(cookiestore, 0, cookiesize); 541 cookie = (struct intio_dma_cookie *)cookiestore; 542 cookie->id_flags = cookieflags; 543 map->x68k_dm_cookie = cookie; 544 545 if (cookieflags & ID_MIGHT_NEED_BOUNCE) { 546 /* 547 * Allocate the bounce pages now if the caller 548 * wishes us to do so. 549 */ 550 if ((flags & BUS_DMA_ALLOCNOW) == 0) 551 goto out; 552 553 error = _intio_dma_alloc_bouncebuf(t, map, size, flags); 554 } 555 556 out: 557 if (error) { 558 if (map->x68k_dm_cookie != NULL) 559 free(map->x68k_dm_cookie, M_DMAMAP); 560 x68k_bus_dmamap_destroy(t, map); 561 } 562 return (error); 563 } 564 565 /* 566 * Destroy an INTIO DMA map. 567 */ 568 void 569 _intio_bus_dmamap_destroy(t, map) 570 bus_dma_tag_t t; 571 bus_dmamap_t map; 572 { 573 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 574 575 /* 576 * Free any bounce pages this map might hold. 577 */ 578 if (cookie->id_flags & ID_HAS_BOUNCE) 579 _intio_dma_free_bouncebuf(t, map); 580 581 free(cookie, M_DMAMAP); 582 x68k_bus_dmamap_destroy(t, map); 583 } 584 585 /* 586 * Load an INTIO DMA map with a linear buffer. 587 */ 588 int 589 _intio_bus_dmamap_load(t, map, buf, buflen, p, flags) 590 bus_dma_tag_t t; 591 bus_dmamap_t map; 592 void *buf; 593 bus_size_t buflen; 594 struct proc *p; 595 int flags; 596 { 597 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 598 int error; 599 600 /* 601 * Make sure that on error condition we return "no valid mappings." 602 */ 603 map->dm_mapsize = 0; 604 map->dm_nsegs = 0; 605 606 /* 607 * Try to load the map the normal way. If this errors out, 608 * and we can bounce, we will. 609 */ 610 error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags); 611 if (error == 0 || 612 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 613 return (error); 614 615 /* 616 * Allocate bounce pages, if necessary. 617 */ 618 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 619 error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags); 620 if (error) 621 return (error); 622 } 623 624 /* 625 * Cache a pointer to the caller's buffer and load the DMA map 626 * with the bounce buffer. 627 */ 628 cookie->id_origbuf = buf; 629 cookie->id_origbuflen = buflen; 630 cookie->id_buftype = ID_BUFTYPE_LINEAR; 631 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen, 632 p, flags); 633 if (error) { 634 /* 635 * Free the bounce pages, unless our resources 636 * are reserved for our exclusive use. 637 */ 638 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 639 _intio_dma_free_bouncebuf(t, map); 640 return (error); 641 } 642 643 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 644 cookie->id_flags |= ID_IS_BOUNCING; 645 return (0); 646 } 647 648 /* 649 * Like _intio_bus_dmamap_load(), but for mbufs. 650 */ 651 int 652 _intio_bus_dmamap_load_mbuf(t, map, m0, flags) 653 bus_dma_tag_t t; 654 bus_dmamap_t map; 655 struct mbuf *m0; 656 int flags; 657 { 658 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 659 int error; 660 661 /* 662 * Make sure on error condition we return "no valid mappings." 663 */ 664 map->dm_mapsize = 0; 665 map->dm_nsegs = 0; 666 667 #ifdef DIAGNOSTIC 668 if ((m0->m_flags & M_PKTHDR) == 0) 669 panic("_intio_bus_dmamap_load_mbuf: no packet header"); 670 #endif 671 672 if (m0->m_pkthdr.len > map->x68k_dm_size) 673 return (EINVAL); 674 675 /* 676 * Try to load the map the normal way. If this errors out, 677 * and we can bounce, we will. 678 */ 679 error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags); 680 if (error == 0 || 681 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 682 return (error); 683 684 /* 685 * Allocate bounce pages, if necessary. 686 */ 687 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 688 error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len, 689 flags); 690 if (error) 691 return (error); 692 } 693 694 /* 695 * Cache a pointer to the caller's buffer and load the DMA map 696 * with the bounce buffer. 697 */ 698 cookie->id_origbuf = m0; 699 cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */ 700 cookie->id_buftype = ID_BUFTYPE_MBUF; 701 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, 702 m0->m_pkthdr.len, NULL, flags); 703 if (error) { 704 /* 705 * Free the bounce pages, unless our resources 706 * are reserved for our exclusive use. 707 */ 708 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 709 _intio_dma_free_bouncebuf(t, map); 710 return (error); 711 } 712 713 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 714 cookie->id_flags |= ID_IS_BOUNCING; 715 return (0); 716 } 717 718 /* 719 * Like _intio_bus_dmamap_load(), but for uios. 720 */ 721 int 722 _intio_bus_dmamap_load_uio(t, map, uio, flags) 723 bus_dma_tag_t t; 724 bus_dmamap_t map; 725 struct uio *uio; 726 int flags; 727 { 728 panic("_intio_bus_dmamap_load_uio: not implemented"); 729 } 730 731 /* 732 * Like _intio_bus_dmamap_load(), but for raw memory allocated with 733 * bus_dmamem_alloc(). 734 */ 735 int 736 _intio_bus_dmamap_load_raw(t, map, segs, nsegs, size, flags) 737 bus_dma_tag_t t; 738 bus_dmamap_t map; 739 bus_dma_segment_t *segs; 740 int nsegs; 741 bus_size_t size; 742 int flags; 743 { 744 745 panic("_intio_bus_dmamap_load_raw: not implemented"); 746 } 747 748 /* 749 * Unload an INTIO DMA map. 750 */ 751 void 752 _intio_bus_dmamap_unload(t, map) 753 bus_dma_tag_t t; 754 bus_dmamap_t map; 755 { 756 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 757 758 /* 759 * If we have bounce pages, free them, unless they're 760 * reserved for our exclusive use. 761 */ 762 if ((cookie->id_flags & ID_HAS_BOUNCE) && 763 (map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 764 _intio_dma_free_bouncebuf(t, map); 765 766 cookie->id_flags &= ~ID_IS_BOUNCING; 767 cookie->id_buftype = ID_BUFTYPE_INVALID; 768 769 /* 770 * Do the generic bits of the unload. 771 */ 772 x68k_bus_dmamap_unload(t, map); 773 } 774 775 /* 776 * Synchronize an INTIO DMA map. 777 */ 778 void 779 _intio_bus_dmamap_sync(t, map, offset, len, ops) 780 bus_dma_tag_t t; 781 bus_dmamap_t map; 782 bus_addr_t offset; 783 bus_size_t len; 784 int ops; 785 { 786 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 787 788 /* 789 * Mixing PRE and POST operations is not allowed. 790 */ 791 if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 && 792 (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0) 793 panic("_intio_bus_dmamap_sync: mix PRE and POST"); 794 795 #ifdef DIAGNOSTIC 796 if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) { 797 if (offset >= map->dm_mapsize) 798 panic("_intio_bus_dmamap_sync: bad offset"); 799 if (len == 0 || (offset + len) > map->dm_mapsize) 800 panic("_intio_bus_dmamap_sync: bad length"); 801 } 802 #endif 803 804 /* 805 * If we're not bouncing, just return; nothing to do. 806 */ 807 if ((cookie->id_flags & ID_IS_BOUNCING) == 0) 808 return; 809 810 switch (cookie->id_buftype) { 811 case ID_BUFTYPE_LINEAR: 812 /* 813 * Nothing to do for pre-read. 814 */ 815 816 if (ops & BUS_DMASYNC_PREWRITE) { 817 /* 818 * Copy the caller's buffer to the bounce buffer. 819 */ 820 memcpy((char *)cookie->id_bouncebuf + offset, 821 (char *)cookie->id_origbuf + offset, len); 822 } 823 824 if (ops & BUS_DMASYNC_POSTREAD) { 825 /* 826 * Copy the bounce buffer to the caller's buffer. 827 */ 828 memcpy((char *)cookie->id_origbuf + offset, 829 (char *)cookie->id_bouncebuf + offset, len); 830 } 831 832 /* 833 * Nothing to do for post-write. 834 */ 835 break; 836 837 case ID_BUFTYPE_MBUF: 838 { 839 struct mbuf *m, *m0 = cookie->id_origbuf; 840 bus_size_t minlen, moff; 841 842 /* 843 * Nothing to do for pre-read. 844 */ 845 846 if (ops & BUS_DMASYNC_PREWRITE) { 847 /* 848 * Copy the caller's buffer to the bounce buffer. 849 */ 850 m_copydata(m0, offset, len, 851 (char *)cookie->id_bouncebuf + offset); 852 } 853 854 if (ops & BUS_DMASYNC_POSTREAD) { 855 /* 856 * Copy the bounce buffer to the caller's buffer. 857 */ 858 for (moff = offset, m = m0; m != NULL && len != 0; 859 m = m->m_next) { 860 /* Find the beginning mbuf. */ 861 if (moff >= m->m_len) { 862 moff -= m->m_len; 863 continue; 864 } 865 866 /* 867 * Now at the first mbuf to sync; nail 868 * each one until we have exhausted the 869 * length. 870 */ 871 minlen = len < m->m_len - moff ? 872 len : m->m_len - moff; 873 874 memcpy(mtod(m, caddr_t) + moff, 875 (char *)cookie->id_bouncebuf + offset, 876 minlen); 877 878 moff = 0; 879 len -= minlen; 880 offset += minlen; 881 } 882 } 883 884 /* 885 * Nothing to do for post-write. 886 */ 887 break; 888 } 889 890 case ID_BUFTYPE_UIO: 891 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO"); 892 break; 893 894 case ID_BUFTYPE_RAW: 895 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW"); 896 break; 897 898 case ID_BUFTYPE_INVALID: 899 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID"); 900 break; 901 902 default: 903 printf("unknown buffer type %d\n", cookie->id_buftype); 904 panic("_intio_bus_dmamap_sync"); 905 } 906 } 907 908 /* 909 * Allocate memory safe for INTIO DMA. 910 */ 911 int 912 _intio_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags) 913 bus_dma_tag_t t; 914 bus_size_t size, alignment, boundary; 915 bus_dma_segment_t *segs; 916 int nsegs; 917 int *rsegs; 918 int flags; 919 { 920 paddr_t high; 921 extern paddr_t avail_end; 922 923 if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD) 924 high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD); 925 else 926 high = trunc_page(avail_end); 927 928 return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary, 929 segs, nsegs, rsegs, flags, 0, high)); 930 } 931 932 /********************************************************************** 933 * INTIO DMA utility functions 934 **********************************************************************/ 935 936 int 937 _intio_dma_alloc_bouncebuf(t, map, size, flags) 938 bus_dma_tag_t t; 939 bus_dmamap_t map; 940 bus_size_t size; 941 int flags; 942 { 943 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 944 int error = 0; 945 946 cookie->id_bouncebuflen = round_page(size); 947 error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen, 948 NBPG, map->x68k_dm_boundary, cookie->id_bouncesegs, 949 map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags); 950 if (error) 951 goto out; 952 error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs, 953 cookie->id_nbouncesegs, cookie->id_bouncebuflen, 954 (caddr_t *)&cookie->id_bouncebuf, flags); 955 956 out: 957 if (error) { 958 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 959 cookie->id_nbouncesegs); 960 cookie->id_bouncebuflen = 0; 961 cookie->id_nbouncesegs = 0; 962 } else { 963 cookie->id_flags |= ID_HAS_BOUNCE; 964 } 965 966 return (error); 967 } 968 969 void 970 _intio_dma_free_bouncebuf(t, map) 971 bus_dma_tag_t t; 972 bus_dmamap_t map; 973 { 974 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 975 976 x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf, 977 cookie->id_bouncebuflen); 978 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 979 cookie->id_nbouncesegs); 980 cookie->id_bouncebuflen = 0; 981 cookie->id_nbouncesegs = 0; 982 cookie->id_flags &= ~ID_HAS_BOUNCE; 983 } 984
Indexes created Fri Oct 03 02:09:57 GMT 2025