intio.c revision 1.12
1 /* $NetBSD: intio.c,v 1.12 2002/09/27 02:24:28 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * NetBSD/x68k internal I/O virtual bus. 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/device.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/extent.h> 46 #include <uvm/uvm_extern.h> 47 48 #include <machine/bus.h> 49 #include <machine/cpu.h> 50 #include <machine/frame.h> 51 52 #include <arch/x68k/dev/intiovar.h> 53 #include <arch/x68k/dev/mfp.h> 54 55 56 /* 57 * bus_space(9) interface 58 */ 59 static int intio_bus_space_map __P((bus_space_tag_t, bus_addr_t, bus_size_t, int, bus_space_handle_t *)); 60 static void intio_bus_space_unmap __P((bus_space_tag_t, bus_space_handle_t, bus_size_t)); 61 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 *)); 62 63 static struct x68k_bus_space intio_bus = { 64 #if 0 65 X68K_INTIO_BUS, 66 #endif 67 intio_bus_space_map, intio_bus_space_unmap, intio_bus_space_subregion, 68 x68k_bus_space_alloc, x68k_bus_space_free, 69 #if 0 70 x68k_bus_space_barrier, 71 #endif 72 73 0 74 }; 75 76 /* 77 * bus_dma(9) interface 78 */ 79 #define INTIO_DMA_BOUNCE_THRESHOLD (16 * 1024 * 1024) 80 int _intio_bus_dmamap_create __P((bus_dma_tag_t, bus_size_t, int, 81 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 82 void _intio_bus_dmamap_destroy __P((bus_dma_tag_t, bus_dmamap_t)); 83 int _intio_bus_dmamap_load __P((bus_dma_tag_t, bus_dmamap_t, void *, 84 bus_size_t, struct proc *, int)); 85 int _intio_bus_dmamap_load_mbuf __P((bus_dma_tag_t, bus_dmamap_t, 86 struct mbuf *, int)); 87 int _intio_bus_dmamap_load_uio __P((bus_dma_tag_t, bus_dmamap_t, 88 struct uio *, int)); 89 int _intio_bus_dmamap_load_raw __P((bus_dma_tag_t, bus_dmamap_t, 90 bus_dma_segment_t *, int, bus_size_t, int)); 91 void _intio_bus_dmamap_unload __P((bus_dma_tag_t, bus_dmamap_t)); 92 void _intio_bus_dmamap_sync __P((bus_dma_tag_t, bus_dmamap_t, 93 bus_addr_t, bus_size_t, int)); 94 95 int _intio_bus_dmamem_alloc __P((bus_dma_tag_t, bus_size_t, bus_size_t, 96 bus_size_t, bus_dma_segment_t *, int, int *, int)); 97 98 int _intio_dma_alloc_bouncebuf __P((bus_dma_tag_t, bus_dmamap_t, 99 bus_size_t, int)); 100 void _intio_dma_free_bouncebuf __P((bus_dma_tag_t, bus_dmamap_t)); 101 102 struct x68k_bus_dma intio_bus_dma = { 103 INTIO_DMA_BOUNCE_THRESHOLD, 104 _intio_bus_dmamap_create, 105 _intio_bus_dmamap_destroy, 106 _intio_bus_dmamap_load, 107 _intio_bus_dmamap_load_mbuf, 108 _intio_bus_dmamap_load_uio, 109 _intio_bus_dmamap_load_raw, 110 _intio_bus_dmamap_unload, 111 _intio_bus_dmamap_sync, 112 _intio_bus_dmamem_alloc, 113 x68k_bus_dmamem_free, 114 x68k_bus_dmamem_map, 115 x68k_bus_dmamem_unmap, 116 x68k_bus_dmamem_mmap, 117 }; 118 119 /* 120 * autoconf stuff 121 */ 122 static int intio_match __P((struct device *, struct cfdata *, void *)); 123 static void intio_attach __P((struct device *, struct device *, void *)); 124 static int intio_search __P((struct device *, struct cfdata *cf, void *)); 125 static int intio_print __P((void *, const char *)); 126 static void intio_alloc_system_ports __P((struct intio_softc*)); 127 128 struct cfattach intio_ca = { 129 sizeof(struct intio_softc), intio_match, intio_attach 130 }; 131 132 static struct intio_interrupt_vector { 133 intio_intr_handler_t iiv_handler; 134 void *iiv_arg; 135 int iiv_intrcntoff; 136 } iiv[256] = {{0,},}; 137 138 extern struct cfdriver intio_cd; 139 140 /* used in console initialization */ 141 extern int x68k_realconfig; 142 int x68k_config_found __P((struct cfdata *, struct device *, 143 void *, cfprint_t)); 144 static struct cfdata *cfdata_intiobus = NULL; 145 146 /* other static functions */ 147 static int scan_intrnames __P((const char *)); 148 #ifdef DEBUG 149 int intio_debug = 0; 150 #endif 151 152 static int 153 intio_match(parent, cf, aux) 154 struct device *parent; 155 struct cfdata *cf; 156 void *aux; /* NULL */ 157 { 158 if (strcmp(aux, intio_cd.cd_name) != 0) 159 return (0); 160 if (cf->cf_unit != 0) 161 return (0); 162 if (x68k_realconfig == 0) 163 cfdata_intiobus = cf; /* XXX */ 164 165 return (1); 166 } 167 168 169 /* used in console initialization: configure only MFP */ 170 static struct intio_attach_args initial_ia = { 171 &intio_bus, 172 0/*XXX*/, 173 174 "mfp", /* ia_name */ 175 MFP_ADDR, /* ia_addr */ 176 0x30, /* ia_size */ 177 MFP_INTR, /* ia_intr */ 178 -1 /* ia_dma */ 179 -1, /* ia_dmaintr */ 180 }; 181 182 static void 183 intio_attach(parent, self, aux) 184 struct device *parent, *self; 185 void *aux; /* NULL */ 186 { 187 struct intio_softc *sc = (struct intio_softc *)self; 188 struct intio_attach_args ia; 189 190 if (self == NULL) { 191 /* console only init */ 192 x68k_config_found(cfdata_intiobus, NULL, &initial_ia, NULL); 193 return; 194 } 195 196 printf (" mapped at %8p\n", intiobase); 197 198 sc->sc_map = extent_create("intiomap", 199 PHYS_INTIODEV, 200 PHYS_INTIODEV + 0x400000, 201 M_DEVBUF, NULL, NULL, EX_NOWAIT); 202 intio_alloc_system_ports (sc); 203 204 sc->sc_bst = &intio_bus; 205 sc->sc_bst->x68k_bus_device = self; 206 sc->sc_dmat = &intio_bus_dma; 207 sc->sc_dmac = 0; 208 209 memset(iiv, 0, sizeof (struct intio_interrupt_vector) * 256); 210 211 ia.ia_bst = sc->sc_bst; 212 ia.ia_dmat = sc->sc_dmat; 213 214 config_search (intio_search, self, &ia); 215 } 216 217 static int 218 intio_search(parent, cf, aux) 219 struct device *parent; 220 struct cfdata *cf; 221 void *aux; 222 { 223 struct intio_attach_args *ia = aux; 224 struct intio_softc *sc = (struct intio_softc *)parent; 225 226 ia->ia_bst = sc->sc_bst; 227 ia->ia_dmat = sc->sc_dmat; 228 ia->ia_name = cf->cf_name; 229 ia->ia_addr = cf->cf_addr; 230 ia->ia_intr = cf->cf_intr; 231 ia->ia_dma = cf->cf_dma; 232 ia->ia_dmaintr = cf->cf_dmaintr; 233 234 if ((*cf->cf_attach->ca_match)(parent, cf, ia) > 0) 235 config_attach(parent, cf, ia, intio_print); 236 237 return (0); 238 } 239 240 static int 241 intio_print(aux, name) 242 void *aux; 243 const char *name; 244 { 245 struct intio_attach_args *ia = aux; 246 247 /* if (ia->ia_addr > 0) */ 248 printf (" addr 0x%06x", ia->ia_addr); 249 if (ia->ia_intr > 0) 250 printf (" intr 0x%02x", ia->ia_intr); 251 if (ia->ia_dma >= 0) { 252 printf (" using DMA ch%d", ia->ia_dma); 253 if (ia->ia_dmaintr > 0) 254 printf (" intr 0x%02x and 0x%02x", 255 ia->ia_dmaintr, ia->ia_dmaintr+1); 256 } 257 258 return (QUIET); 259 } 260 261 /* 262 * intio memory map manager 263 */ 264 265 int 266 intio_map_allocate_region(parent, ia, flag) 267 struct device *parent; 268 struct intio_attach_args *ia; 269 enum intio_map_flag flag; /* INTIO_MAP_TESTONLY or INTIO_MAP_ALLOCATE */ 270 { 271 struct intio_softc *sc = (struct intio_softc*) parent; 272 struct extent *map = sc->sc_map; 273 int r; 274 275 r = extent_alloc_region (map, ia->ia_addr, ia->ia_size, 0); 276 #ifdef DEBUG 277 if (intio_debug) 278 extent_print (map); 279 #endif 280 if (r == 0) { 281 if (flag != INTIO_MAP_ALLOCATE) 282 extent_free (map, ia->ia_addr, ia->ia_size, 0); 283 return 0; 284 } 285 286 return -1; 287 } 288 289 int 290 intio_map_free_region(parent, ia) 291 struct device *parent; 292 struct intio_attach_args *ia; 293 { 294 struct intio_softc *sc = (struct intio_softc*) parent; 295 struct extent *map = sc->sc_map; 296 297 extent_free (map, ia->ia_addr, ia->ia_size, 0); 298 #ifdef DEBUG 299 if (intio_debug) 300 extent_print (map); 301 #endif 302 return 0; 303 } 304 305 void 306 intio_alloc_system_ports(sc) 307 struct intio_softc *sc; 308 { 309 extent_alloc_region (sc->sc_map, INTIO_SYSPORT, 16, 0); 310 extent_alloc_region (sc->sc_map, INTIO_SICILIAN, 0x2000, 0); 311 } 312 313 314 /* 315 * intio bus space stuff. 316 */ 317 static int 318 intio_bus_space_map(t, bpa, size, flags, bshp) 319 bus_space_tag_t t; 320 bus_addr_t bpa; 321 bus_size_t size; 322 int flags; 323 bus_space_handle_t *bshp; 324 { 325 /* 326 * Intio bus is mapped permanently. 327 */ 328 *bshp = (bus_space_handle_t) 329 ((u_int) bpa - PHYS_INTIODEV + intiobase); 330 /* 331 * Some devices are mapped on odd or even addresses only. 332 */ 333 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_ODD) 334 *bshp += 0x80000001; 335 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_EVEN) 336 *bshp += 0x80000000; 337 338 return (0); 339 } 340 341 static void 342 intio_bus_space_unmap(t, bsh, size) 343 bus_space_tag_t t; 344 bus_space_handle_t bsh; 345 bus_size_t size; 346 { 347 return; 348 } 349 350 static int 351 intio_bus_space_subregion(t, bsh, offset, size, nbshp) 352 bus_space_tag_t t; 353 bus_space_handle_t bsh; 354 bus_size_t offset, size; 355 bus_space_handle_t *nbshp; 356 { 357 358 *nbshp = bsh + offset; 359 return (0); 360 } 361 362 363 /* 364 * interrupt handler 365 */ 366 int 367 intio_intr_establish (vector, name, handler, arg) 368 int vector; 369 const char *name; /* XXX */ 370 intio_intr_handler_t handler; 371 void *arg; 372 { 373 if (vector < 16) 374 panic ("Invalid interrupt vector"); 375 if (iiv[vector].iiv_handler) 376 return EBUSY; 377 iiv[vector].iiv_handler = handler; 378 iiv[vector].iiv_arg = arg; 379 iiv[vector].iiv_intrcntoff = scan_intrnames(name); 380 381 return 0; 382 } 383 384 static int 385 scan_intrnames (name) 386 const char *name; 387 { 388 extern char intrnames[]; 389 extern char eintrnames[]; 390 int r = 0; 391 char *p = &intrnames[0]; 392 393 for (;;) { 394 if (*p == 0) { /* new intr */ 395 if (p + strlen(name) >= eintrnames) 396 panic ("Interrupt statics buffer overrun."); 397 strcpy (p, name); 398 break; 399 } 400 if (strcmp(p, name) == 0) 401 break; 402 r++; 403 while (*p++ != 0); 404 } 405 406 return r; 407 } 408 409 int 410 intio_intr_disestablish (vector, arg) 411 int vector; 412 void *arg; 413 { 414 if (iiv[vector].iiv_handler == 0 || iiv[vector].iiv_arg != arg) 415 return EINVAL; 416 iiv[vector].iiv_handler = 0; 417 iiv[vector].iiv_arg = 0; 418 419 return 0; 420 } 421 422 int 423 intio_intr (frame) 424 struct frame *frame; 425 { 426 int vector = frame->f_vector / 4; 427 extern int intrcnt[]; 428 429 #if 0 /* this is not correct now */ 430 /* CAUTION: HERE WE ARE IN SPLHIGH() */ 431 /* LOWER TO APPROPRIATE IPL AT VERY FIRST IN THE HANDLER!! */ 432 #endif 433 if (iiv[vector].iiv_handler == 0) { 434 printf ("Stray interrupt: %d type %x\n", vector, frame->f_format); 435 return 0; 436 } 437 438 intrcnt[iiv[vector].iiv_intrcntoff]++; 439 440 return (*(iiv[vector].iiv_handler)) (iiv[vector].iiv_arg); 441 } 442 443 /* 444 * Intio I/O controler interrupt 445 */ 446 static u_int8_t intio_ivec = 0; 447 448 void 449 intio_set_ivec (vec) 450 int vec; 451 { 452 vec &= 0xfc; 453 454 if (intio_ivec && intio_ivec != (vec & 0xfc)) 455 panic ("Wrong interrupt vector for Sicilian."); 456 457 intio_ivec = vec; 458 intio_set_sicilian_ivec(vec); 459 } 460 461 462 /* 463 * intio bus dma stuff. stolen from arch/i386/isa/isa_machdep.c 464 */ 465 466 /* 467 * Create an INTIO DMA map. 468 */ 469 int 470 _intio_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp) 471 bus_dma_tag_t t; 472 bus_size_t size; 473 int nsegments; 474 bus_size_t maxsegsz; 475 bus_size_t boundary; 476 int flags; 477 bus_dmamap_t *dmamp; 478 { 479 struct intio_dma_cookie *cookie; 480 bus_dmamap_t map; 481 int error, cookieflags; 482 void *cookiestore; 483 size_t cookiesize; 484 extern paddr_t avail_end; 485 486 /* Call common function to create the basic map. */ 487 error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 488 flags, dmamp); 489 if (error) 490 return (error); 491 492 map = *dmamp; 493 map->x68k_dm_cookie = NULL; 494 495 cookiesize = sizeof(struct intio_dma_cookie); 496 497 /* 498 * INTIO only has 24-bits of address space. This means 499 * we can't DMA to pages over 16M. In order to DMA to 500 * arbitrary buffers, we use "bounce buffers" - pages 501 * in memory below the 16M boundary. On DMA reads, 502 * DMA happens to the bounce buffers, and is copied into 503 * the caller's buffer. On writes, data is copied into 504 * but bounce buffer, and the DMA happens from those 505 * pages. To software using the DMA mapping interface, 506 * this looks simply like a data cache. 507 * 508 * If we have more than 16M of RAM in the system, we may 509 * need bounce buffers. We check and remember that here. 510 * 511 * ...or, there is an opposite case. The most segments 512 * a transfer will require is (maxxfer / NBPG) + 1. If 513 * the caller can't handle that many segments (e.g. the 514 * DMAC), we may have to bounce it as well. 515 */ 516 if (avail_end <= t->_bounce_thresh) 517 /* Bouncing not necessary due to memory size. */ 518 map->x68k_dm_bounce_thresh = 0; 519 cookieflags = 0; 520 if (map->x68k_dm_bounce_thresh != 0 || 521 ((map->x68k_dm_size / NBPG) + 1) > map->x68k_dm_segcnt) { 522 cookieflags |= ID_MIGHT_NEED_BOUNCE; 523 cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt); 524 } 525 526 /* 527 * Allocate our cookie. 528 */ 529 if ((cookiestore = malloc(cookiesize, M_DMAMAP, 530 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL) { 531 error = ENOMEM; 532 goto out; 533 } 534 memset(cookiestore, 0, cookiesize); 535 cookie = (struct intio_dma_cookie *)cookiestore; 536 cookie->id_flags = cookieflags; 537 map->x68k_dm_cookie = cookie; 538 539 if (cookieflags & ID_MIGHT_NEED_BOUNCE) { 540 /* 541 * Allocate the bounce pages now if the caller 542 * wishes us to do so. 543 */ 544 if ((flags & BUS_DMA_ALLOCNOW) == 0) 545 goto out; 546 547 error = _intio_dma_alloc_bouncebuf(t, map, size, flags); 548 } 549 550 out: 551 if (error) { 552 if (map->x68k_dm_cookie != NULL) 553 free(map->x68k_dm_cookie, M_DMAMAP); 554 x68k_bus_dmamap_destroy(t, map); 555 } 556 return (error); 557 } 558 559 /* 560 * Destroy an INTIO DMA map. 561 */ 562 void 563 _intio_bus_dmamap_destroy(t, map) 564 bus_dma_tag_t t; 565 bus_dmamap_t map; 566 { 567 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 568 569 /* 570 * Free any bounce pages this map might hold. 571 */ 572 if (cookie->id_flags & ID_HAS_BOUNCE) 573 _intio_dma_free_bouncebuf(t, map); 574 575 free(cookie, M_DMAMAP); 576 x68k_bus_dmamap_destroy(t, map); 577 } 578 579 /* 580 * Load an INTIO DMA map with a linear buffer. 581 */ 582 int 583 _intio_bus_dmamap_load(t, map, buf, buflen, p, flags) 584 bus_dma_tag_t t; 585 bus_dmamap_t map; 586 void *buf; 587 bus_size_t buflen; 588 struct proc *p; 589 int flags; 590 { 591 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 592 int error; 593 594 /* 595 * Make sure that on error condition we return "no valid mappings." 596 */ 597 map->dm_mapsize = 0; 598 map->dm_nsegs = 0; 599 600 /* 601 * Try to load the map the normal way. If this errors out, 602 * and we can bounce, we will. 603 */ 604 error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags); 605 if (error == 0 || 606 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 607 return (error); 608 609 /* 610 * Allocate bounce pages, if necessary. 611 */ 612 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 613 error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags); 614 if (error) 615 return (error); 616 } 617 618 /* 619 * Cache a pointer to the caller's buffer and load the DMA map 620 * with the bounce buffer. 621 */ 622 cookie->id_origbuf = buf; 623 cookie->id_origbuflen = buflen; 624 cookie->id_buftype = ID_BUFTYPE_LINEAR; 625 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen, 626 p, flags); 627 if (error) { 628 /* 629 * Free the bounce pages, unless our resources 630 * are reserved for our exclusive use. 631 */ 632 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 633 _intio_dma_free_bouncebuf(t, map); 634 return (error); 635 } 636 637 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 638 cookie->id_flags |= ID_IS_BOUNCING; 639 return (0); 640 } 641 642 /* 643 * Like _intio_bus_dmamap_load(), but for mbufs. 644 */ 645 int 646 _intio_bus_dmamap_load_mbuf(t, map, m0, flags) 647 bus_dma_tag_t t; 648 bus_dmamap_t map; 649 struct mbuf *m0; 650 int flags; 651 { 652 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 653 int error; 654 655 /* 656 * Make sure on error condition we return "no valid mappings." 657 */ 658 map->dm_mapsize = 0; 659 map->dm_nsegs = 0; 660 661 #ifdef DIAGNOSTIC 662 if ((m0->m_flags & M_PKTHDR) == 0) 663 panic("_intio_bus_dmamap_load_mbuf: no packet header"); 664 #endif 665 666 if (m0->m_pkthdr.len > map->x68k_dm_size) 667 return (EINVAL); 668 669 /* 670 * Try to load the map the normal way. If this errors out, 671 * and we can bounce, we will. 672 */ 673 error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags); 674 if (error == 0 || 675 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 676 return (error); 677 678 /* 679 * Allocate bounce pages, if necessary. 680 */ 681 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 682 error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len, 683 flags); 684 if (error) 685 return (error); 686 } 687 688 /* 689 * Cache a pointer to the caller's buffer and load the DMA map 690 * with the bounce buffer. 691 */ 692 cookie->id_origbuf = m0; 693 cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */ 694 cookie->id_buftype = ID_BUFTYPE_MBUF; 695 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, 696 m0->m_pkthdr.len, NULL, flags); 697 if (error) { 698 /* 699 * Free the bounce pages, unless our resources 700 * are reserved for our exclusive use. 701 */ 702 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 703 _intio_dma_free_bouncebuf(t, map); 704 return (error); 705 } 706 707 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 708 cookie->id_flags |= ID_IS_BOUNCING; 709 return (0); 710 } 711 712 /* 713 * Like _intio_bus_dmamap_load(), but for uios. 714 */ 715 int 716 _intio_bus_dmamap_load_uio(t, map, uio, flags) 717 bus_dma_tag_t t; 718 bus_dmamap_t map; 719 struct uio *uio; 720 int flags; 721 { 722 panic("_intio_bus_dmamap_load_uio: not implemented"); 723 } 724 725 /* 726 * Like _intio_bus_dmamap_load(), but for raw memory allocated with 727 * bus_dmamem_alloc(). 728 */ 729 int 730 _intio_bus_dmamap_load_raw(t, map, segs, nsegs, size, flags) 731 bus_dma_tag_t t; 732 bus_dmamap_t map; 733 bus_dma_segment_t *segs; 734 int nsegs; 735 bus_size_t size; 736 int flags; 737 { 738 739 panic("_intio_bus_dmamap_load_raw: not implemented"); 740 } 741 742 /* 743 * Unload an INTIO DMA map. 744 */ 745 void 746 _intio_bus_dmamap_unload(t, map) 747 bus_dma_tag_t t; 748 bus_dmamap_t map; 749 { 750 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 751 752 /* 753 * If we have bounce pages, free them, unless they're 754 * reserved for our exclusive use. 755 */ 756 if ((cookie->id_flags & ID_HAS_BOUNCE) && 757 (map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 758 _intio_dma_free_bouncebuf(t, map); 759 760 cookie->id_flags &= ~ID_IS_BOUNCING; 761 cookie->id_buftype = ID_BUFTYPE_INVALID; 762 763 /* 764 * Do the generic bits of the unload. 765 */ 766 x68k_bus_dmamap_unload(t, map); 767 } 768 769 /* 770 * Synchronize an INTIO DMA map. 771 */ 772 void 773 _intio_bus_dmamap_sync(t, map, offset, len, ops) 774 bus_dma_tag_t t; 775 bus_dmamap_t map; 776 bus_addr_t offset; 777 bus_size_t len; 778 int ops; 779 { 780 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 781 782 /* 783 * Mixing PRE and POST operations is not allowed. 784 */ 785 if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 && 786 (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0) 787 panic("_intio_bus_dmamap_sync: mix PRE and POST"); 788 789 #ifdef DIAGNOSTIC 790 if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) { 791 if (offset >= map->dm_mapsize) 792 panic("_intio_bus_dmamap_sync: bad offset"); 793 if (len == 0 || (offset + len) > map->dm_mapsize) 794 panic("_intio_bus_dmamap_sync: bad length"); 795 } 796 #endif 797 798 /* 799 * If we're not bouncing, just return; nothing to do. 800 */ 801 if ((cookie->id_flags & ID_IS_BOUNCING) == 0) 802 return; 803 804 switch (cookie->id_buftype) { 805 case ID_BUFTYPE_LINEAR: 806 /* 807 * Nothing to do for pre-read. 808 */ 809 810 if (ops & BUS_DMASYNC_PREWRITE) { 811 /* 812 * Copy the caller's buffer to the bounce buffer. 813 */ 814 memcpy((char *)cookie->id_bouncebuf + offset, 815 (char *)cookie->id_origbuf + offset, len); 816 } 817 818 if (ops & BUS_DMASYNC_POSTREAD) { 819 /* 820 * Copy the bounce buffer to the caller's buffer. 821 */ 822 memcpy((char *)cookie->id_origbuf + offset, 823 (char *)cookie->id_bouncebuf + offset, len); 824 } 825 826 /* 827 * Nothing to do for post-write. 828 */ 829 break; 830 831 case ID_BUFTYPE_MBUF: 832 { 833 struct mbuf *m, *m0 = cookie->id_origbuf; 834 bus_size_t minlen, moff; 835 836 /* 837 * Nothing to do for pre-read. 838 */ 839 840 if (ops & BUS_DMASYNC_PREWRITE) { 841 /* 842 * Copy the caller's buffer to the bounce buffer. 843 */ 844 m_copydata(m0, offset, len, 845 (char *)cookie->id_bouncebuf + offset); 846 } 847 848 if (ops & BUS_DMASYNC_POSTREAD) { 849 /* 850 * Copy the bounce buffer to the caller's buffer. 851 */ 852 for (moff = offset, m = m0; m != NULL && len != 0; 853 m = m->m_next) { 854 /* Find the beginning mbuf. */ 855 if (moff >= m->m_len) { 856 moff -= m->m_len; 857 continue; 858 } 859 860 /* 861 * Now at the first mbuf to sync; nail 862 * each one until we have exhausted the 863 * length. 864 */ 865 minlen = len < m->m_len - moff ? 866 len : m->m_len - moff; 867 868 memcpy(mtod(m, caddr_t) + moff, 869 (char *)cookie->id_bouncebuf + offset, 870 minlen); 871 872 moff = 0; 873 len -= minlen; 874 offset += minlen; 875 } 876 } 877 878 /* 879 * Nothing to do for post-write. 880 */ 881 break; 882 } 883 884 case ID_BUFTYPE_UIO: 885 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO"); 886 break; 887 888 case ID_BUFTYPE_RAW: 889 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW"); 890 break; 891 892 case ID_BUFTYPE_INVALID: 893 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID"); 894 break; 895 896 default: 897 printf("unknown buffer type %d\n", cookie->id_buftype); 898 panic("_intio_bus_dmamap_sync"); 899 } 900 } 901 902 /* 903 * Allocate memory safe for INTIO DMA. 904 */ 905 int 906 _intio_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags) 907 bus_dma_tag_t t; 908 bus_size_t size, alignment, boundary; 909 bus_dma_segment_t *segs; 910 int nsegs; 911 int *rsegs; 912 int flags; 913 { 914 paddr_t high; 915 extern paddr_t avail_end; 916 917 if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD) 918 high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD); 919 else 920 high = trunc_page(avail_end); 921 922 return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary, 923 segs, nsegs, rsegs, flags, 0, high)); 924 } 925 926 /********************************************************************** 927 * INTIO DMA utility functions 928 **********************************************************************/ 929 930 int 931 _intio_dma_alloc_bouncebuf(t, map, size, flags) 932 bus_dma_tag_t t; 933 bus_dmamap_t map; 934 bus_size_t size; 935 int flags; 936 { 937 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 938 int error = 0; 939 940 cookie->id_bouncebuflen = round_page(size); 941 error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen, 942 NBPG, map->x68k_dm_boundary, cookie->id_bouncesegs, 943 map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags); 944 if (error) 945 goto out; 946 error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs, 947 cookie->id_nbouncesegs, cookie->id_bouncebuflen, 948 (caddr_t *)&cookie->id_bouncebuf, flags); 949 950 out: 951 if (error) { 952 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 953 cookie->id_nbouncesegs); 954 cookie->id_bouncebuflen = 0; 955 cookie->id_nbouncesegs = 0; 956 } else { 957 cookie->id_flags |= ID_HAS_BOUNCE; 958 } 959 960 return (error); 961 } 962 963 void 964 _intio_dma_free_bouncebuf(t, map) 965 bus_dma_tag_t t; 966 bus_dmamap_t map; 967 { 968 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 969 970 x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf, 971 cookie->id_bouncebuflen); 972 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 973 cookie->id_nbouncesegs); 974 cookie->id_bouncebuflen = 0; 975 cookie->id_nbouncesegs = 0; 976 cookie->id_flags &= ~ID_HAS_BOUNCE; 977 } 978
Indexes created Mon Sep 22 13:09:51 GMT 2025