intio.c revision 1.24
1 /* $NetBSD: intio.c,v 1.24 2004/12/13 02:14:13 chs 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/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: intio.c,v 1.24 2004/12/13 02:14:13 chs Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/device.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/extent.h> 49 #include <uvm/uvm_extern.h> 50 51 #include <machine/bus.h> 52 #include <machine/cpu.h> 53 #include <machine/frame.h> 54 55 #include <arch/x68k/dev/intiovar.h> 56 #include <arch/x68k/dev/mfp.h> 57 58 59 /* 60 * bus_space(9) interface 61 */ 62 static int intio_bus_space_map __P((bus_space_tag_t, bus_addr_t, bus_size_t, int, bus_space_handle_t *)); 63 static void intio_bus_space_unmap __P((bus_space_tag_t, bus_space_handle_t, bus_size_t)); 64 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 *)); 65 66 static struct x68k_bus_space intio_bus = { 67 #if 0 68 X68K_INTIO_BUS, 69 #endif 70 intio_bus_space_map, intio_bus_space_unmap, intio_bus_space_subregion, 71 x68k_bus_space_alloc, x68k_bus_space_free, 72 #if 0 73 x68k_bus_space_barrier, 74 #endif 75 76 0 77 }; 78 79 /* 80 * bus_dma(9) interface 81 */ 82 #define INTIO_DMA_BOUNCE_THRESHOLD (16 * 1024 * 1024) 83 int _intio_bus_dmamap_create __P((bus_dma_tag_t, bus_size_t, int, 84 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 85 void _intio_bus_dmamap_destroy __P((bus_dma_tag_t, bus_dmamap_t)); 86 int _intio_bus_dmamap_load __P((bus_dma_tag_t, bus_dmamap_t, void *, 87 bus_size_t, struct proc *, int)); 88 int _intio_bus_dmamap_load_mbuf __P((bus_dma_tag_t, bus_dmamap_t, 89 struct mbuf *, int)); 90 int _intio_bus_dmamap_load_uio __P((bus_dma_tag_t, bus_dmamap_t, 91 struct uio *, int)); 92 int _intio_bus_dmamap_load_raw __P((bus_dma_tag_t, bus_dmamap_t, 93 bus_dma_segment_t *, int, bus_size_t, int)); 94 void _intio_bus_dmamap_unload __P((bus_dma_tag_t, bus_dmamap_t)); 95 void _intio_bus_dmamap_sync __P((bus_dma_tag_t, bus_dmamap_t, 96 bus_addr_t, bus_size_t, int)); 97 98 int _intio_bus_dmamem_alloc __P((bus_dma_tag_t, bus_size_t, bus_size_t, 99 bus_size_t, bus_dma_segment_t *, int, int *, int)); 100 101 int _intio_dma_alloc_bouncebuf __P((bus_dma_tag_t, bus_dmamap_t, 102 bus_size_t, int)); 103 void _intio_dma_free_bouncebuf __P((bus_dma_tag_t, bus_dmamap_t)); 104 105 struct x68k_bus_dma intio_bus_dma = { 106 INTIO_DMA_BOUNCE_THRESHOLD, 107 _intio_bus_dmamap_create, 108 _intio_bus_dmamap_destroy, 109 _intio_bus_dmamap_load, 110 _intio_bus_dmamap_load_mbuf, 111 _intio_bus_dmamap_load_uio, 112 _intio_bus_dmamap_load_raw, 113 _intio_bus_dmamap_unload, 114 _intio_bus_dmamap_sync, 115 _intio_bus_dmamem_alloc, 116 x68k_bus_dmamem_free, 117 x68k_bus_dmamem_map, 118 x68k_bus_dmamem_unmap, 119 x68k_bus_dmamem_mmap, 120 }; 121 122 /* 123 * autoconf stuff 124 */ 125 static int intio_match __P((struct device *, struct cfdata *, void *)); 126 static void intio_attach __P((struct device *, struct device *, void *)); 127 static int intio_search __P((struct device *, struct cfdata *cf, void *)); 128 static int intio_print __P((void *, const char *)); 129 static void intio_alloc_system_ports __P((struct intio_softc*)); 130 131 CFATTACH_DECL(intio, sizeof(struct intio_softc), 132 intio_match, intio_attach, NULL, NULL); 133 134 extern struct cfdriver intio_cd; 135 136 static int intio_attached; 137 138 static struct intio_interrupt_vector { 139 intio_intr_handler_t iiv_handler; 140 void *iiv_arg; 141 int iiv_intrcntoff; 142 } iiv[256] = {{0,},}; 143 144 /* used in console initialization */ 145 extern int x68k_realconfig; 146 int x68k_config_found __P((struct cfdata *, struct device *, 147 void *, cfprint_t)); 148 static struct cfdata *cfdata_intiobus = NULL; 149 150 /* other static functions */ 151 static int scan_intrnames __P((const char *)); 152 #ifdef DEBUG 153 int intio_debug = 0; 154 #endif 155 156 static int 157 intio_match(parent, cf, aux) 158 struct device *parent; 159 struct cfdata *cf; 160 void *aux; /* NULL */ 161 { 162 if (strcmp(aux, intio_cd.cd_name) != 0) 163 return (0); 164 if (intio_attached) 165 return (0); 166 if (x68k_realconfig == 0) 167 cfdata_intiobus = cf; /* XXX */ 168 169 return (1); 170 } 171 172 173 /* used in console initialization: configure only MFP */ 174 static struct intio_attach_args initial_ia = { 175 &intio_bus, 176 0/*XXX*/, 177 178 "mfp", /* ia_name */ 179 MFP_ADDR, /* ia_addr */ 180 0x30, /* ia_size */ 181 MFP_INTR, /* ia_intr */ 182 -1 /* ia_dma */ 183 -1, /* ia_dmaintr */ 184 }; 185 186 static void 187 intio_attach(parent, self, aux) 188 struct device *parent, *self; 189 void *aux; /* NULL */ 190 { 191 struct intio_softc *sc = (struct intio_softc *)self; 192 struct intio_attach_args ia; 193 194 if (self == NULL) { 195 /* console only init */ 196 x68k_config_found(cfdata_intiobus, NULL, &initial_ia, NULL); 197 return; 198 } 199 200 intio_attached = 1; 201 202 printf (" mapped at %8p\n", intiobase); 203 204 sc->sc_map = extent_create("intiomap", 205 PHYS_INTIODEV, 206 PHYS_INTIODEV + 0x400000, 207 M_DEVBUF, NULL, 0, EX_NOWAIT); 208 intio_alloc_system_ports (sc); 209 210 sc->sc_bst = &intio_bus; 211 sc->sc_bst->x68k_bus_device = self; 212 sc->sc_dmat = &intio_bus_dma; 213 sc->sc_dmac = 0; 214 215 memset(iiv, 0, sizeof (struct intio_interrupt_vector) * 256); 216 217 ia.ia_bst = sc->sc_bst; 218 ia.ia_dmat = sc->sc_dmat; 219 220 config_search (intio_search, self, &ia); 221 } 222 223 static int 224 intio_search(parent, cf, aux) 225 struct device *parent; 226 struct cfdata *cf; 227 void *aux; 228 { 229 struct intio_attach_args *ia = aux; 230 struct intio_softc *sc = (struct intio_softc *)parent; 231 232 ia->ia_bst = sc->sc_bst; 233 ia->ia_dmat = sc->sc_dmat; 234 ia->ia_name = cf->cf_name; 235 ia->ia_addr = cf->cf_addr; 236 ia->ia_intr = cf->cf_intr; 237 ia->ia_dma = cf->cf_dma; 238 ia->ia_dmaintr = cf->cf_dmaintr; 239 240 if (config_match(parent, cf, ia) > 0) 241 config_attach(parent, cf, ia, intio_print); 242 243 return (0); 244 } 245 246 static int 247 intio_print(aux, name) 248 void *aux; 249 const char *name; 250 { 251 struct intio_attach_args *ia = aux; 252 253 /* if (ia->ia_addr > 0) */ 254 aprint_normal (" addr 0x%06x", ia->ia_addr); 255 if (ia->ia_intr > 0) 256 aprint_normal (" intr 0x%02x", ia->ia_intr); 257 if (ia->ia_dma >= 0) { 258 aprint_normal (" using DMA ch%d", ia->ia_dma); 259 if (ia->ia_dmaintr > 0) 260 aprint_normal (" intr 0x%02x and 0x%02x", 261 ia->ia_dmaintr, ia->ia_dmaintr+1); 262 } 263 264 return (QUIET); 265 } 266 267 /* 268 * intio memory map manager 269 */ 270 271 int 272 intio_map_allocate_region(parent, ia, flag) 273 struct device *parent; 274 struct intio_attach_args *ia; 275 enum intio_map_flag flag; /* INTIO_MAP_TESTONLY or INTIO_MAP_ALLOCATE */ 276 { 277 struct intio_softc *sc = (struct intio_softc*) parent; 278 struct extent *map = sc->sc_map; 279 int r; 280 281 r = extent_alloc_region (map, ia->ia_addr, ia->ia_size, 0); 282 #ifdef DEBUG 283 if (intio_debug) 284 extent_print (map); 285 #endif 286 if (r == 0) { 287 if (flag != INTIO_MAP_ALLOCATE) 288 extent_free (map, ia->ia_addr, ia->ia_size, 0); 289 return 0; 290 } 291 292 return -1; 293 } 294 295 int 296 intio_map_free_region(parent, ia) 297 struct device *parent; 298 struct intio_attach_args *ia; 299 { 300 struct intio_softc *sc = (struct intio_softc*) parent; 301 struct extent *map = sc->sc_map; 302 303 extent_free (map, ia->ia_addr, ia->ia_size, 0); 304 #ifdef DEBUG 305 if (intio_debug) 306 extent_print (map); 307 #endif 308 return 0; 309 } 310 311 void 312 intio_alloc_system_ports(sc) 313 struct intio_softc *sc; 314 { 315 extent_alloc_region (sc->sc_map, INTIO_SYSPORT, 16, 0); 316 extent_alloc_region (sc->sc_map, INTIO_SICILIAN, 0x2000, 0); 317 } 318 319 320 /* 321 * intio bus space stuff. 322 */ 323 static int 324 intio_bus_space_map(t, bpa, size, flags, bshp) 325 bus_space_tag_t t; 326 bus_addr_t bpa; 327 bus_size_t size; 328 int flags; 329 bus_space_handle_t *bshp; 330 { 331 /* 332 * Intio bus is mapped permanently. 333 */ 334 *bshp = (bus_space_handle_t) 335 ((u_int) bpa - PHYS_INTIODEV + intiobase); 336 /* 337 * Some devices are mapped on odd or even addresses only. 338 */ 339 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_ODD) 340 *bshp += 0x80000001; 341 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_EVEN) 342 *bshp += 0x80000000; 343 344 return (0); 345 } 346 347 static void 348 intio_bus_space_unmap(t, bsh, size) 349 bus_space_tag_t t; 350 bus_space_handle_t bsh; 351 bus_size_t size; 352 { 353 return; 354 } 355 356 static int 357 intio_bus_space_subregion(t, bsh, offset, size, nbshp) 358 bus_space_tag_t t; 359 bus_space_handle_t bsh; 360 bus_size_t offset, size; 361 bus_space_handle_t *nbshp; 362 { 363 364 *nbshp = bsh + offset; 365 return (0); 366 } 367 368 369 /* 370 * interrupt handler 371 */ 372 int 373 intio_intr_establish (vector, name, handler, arg) 374 int vector; 375 const char *name; /* XXX */ 376 intio_intr_handler_t handler; 377 void *arg; 378 { 379 if (vector < 16) 380 panic ("Invalid interrupt vector"); 381 if (iiv[vector].iiv_handler) 382 return EBUSY; 383 iiv[vector].iiv_handler = handler; 384 iiv[vector].iiv_arg = arg; 385 iiv[vector].iiv_intrcntoff = scan_intrnames(name); 386 387 return 0; 388 } 389 390 static int 391 scan_intrnames (name) 392 const char *name; 393 { 394 extern char intrnames[]; 395 extern char eintrnames[]; 396 int r = 0; 397 char *p = &intrnames[0]; 398 399 for (;;) { 400 if (*p == 0) { /* new intr */ 401 if (p + strlen(name) >= eintrnames) 402 panic ("Interrupt statics buffer overrun."); 403 strcpy (p, name); 404 break; 405 } 406 if (strcmp(p, name) == 0) 407 break; 408 r++; 409 while (*p++ != 0); 410 } 411 412 return r; 413 } 414 415 int 416 intio_intr_disestablish (vector, arg) 417 int vector; 418 void *arg; 419 { 420 if (iiv[vector].iiv_handler == 0 || iiv[vector].iiv_arg != arg) 421 return EINVAL; 422 iiv[vector].iiv_handler = 0; 423 iiv[vector].iiv_arg = 0; 424 425 return 0; 426 } 427 428 int 429 intio_intr (frame) 430 struct frame *frame; 431 { 432 int vector = frame->f_vector / 4; 433 extern int intrcnt[]; 434 435 #if 0 /* this is not correct now */ 436 /* CAUTION: HERE WE ARE IN SPLHIGH() */ 437 /* LOWER TO APPROPRIATE IPL AT VERY FIRST IN THE HANDLER!! */ 438 #endif 439 if (iiv[vector].iiv_handler == 0) { 440 printf ("Stray interrupt: %d type %x, pc %x\n", 441 vector, frame->f_format, frame->f_pc); 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 controller interrupt 452 */ 453 static u_int8_t intio_ivec = 0; 454 455 void 456 intio_set_ivec (vec) 457 int vec; 458 { 459 vec &= 0xfc; 460 461 if (intio_ivec && intio_ivec != (vec & 0xfc)) 462 panic ("Wrong interrupt vector for Sicilian."); 463 464 intio_ivec = vec; 465 intio_set_sicilian_ivec(vec); 466 } 467 468 469 /* 470 * intio bus DMA stuff. stolen from arch/i386/isa/isa_machdep.c 471 */ 472 473 /* 474 * Create an INTIO DMA map. 475 */ 476 int 477 _intio_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp) 478 bus_dma_tag_t t; 479 bus_size_t size; 480 int nsegments; 481 bus_size_t maxsegsz; 482 bus_size_t boundary; 483 int flags; 484 bus_dmamap_t *dmamp; 485 { 486 struct intio_dma_cookie *cookie; 487 bus_dmamap_t map; 488 int error, cookieflags; 489 void *cookiestore; 490 size_t cookiesize; 491 extern paddr_t avail_end; 492 493 /* Call common function to create the basic map. */ 494 error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 495 flags, dmamp); 496 if (error) 497 return (error); 498 499 map = *dmamp; 500 map->x68k_dm_cookie = NULL; 501 502 cookiesize = sizeof(struct intio_dma_cookie); 503 504 /* 505 * INTIO only has 24-bits of address space. This means 506 * we can't DMA to pages over 16M. In order to DMA to 507 * arbitrary buffers, we use "bounce buffers" - pages 508 * in memory below the 16M boundary. On DMA reads, 509 * DMA happens to the bounce buffers, and is copied into 510 * the caller's buffer. On writes, data is copied into 511 * but bounce buffer, and the DMA happens from those 512 * pages. To software using the DMA mapping interface, 513 * this looks simply like a data cache. 514 * 515 * If we have more than 16M of RAM in the system, we may 516 * need bounce buffers. We check and remember that here. 517 * 518 * ...or, there is an opposite case. The most segments 519 * a transfer will require is (maxxfer / PAGE_SIZE) + 1. If 520 * the caller can't handle that many segments (e.g. the 521 * DMAC), we may have to bounce it as well. 522 */ 523 if (avail_end <= t->_bounce_thresh) 524 /* Bouncing not necessary due to memory size. */ 525 map->x68k_dm_bounce_thresh = 0; 526 cookieflags = 0; 527 if (map->x68k_dm_bounce_thresh != 0 || 528 ((map->x68k_dm_size / PAGE_SIZE) + 1) > map->x68k_dm_segcnt) { 529 cookieflags |= ID_MIGHT_NEED_BOUNCE; 530 cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt); 531 } 532 533 /* 534 * Allocate our cookie. 535 */ 536 if ((cookiestore = malloc(cookiesize, M_DMAMAP, 537 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL) { 538 error = ENOMEM; 539 goto out; 540 } 541 memset(cookiestore, 0, cookiesize); 542 cookie = (struct intio_dma_cookie *)cookiestore; 543 cookie->id_flags = cookieflags; 544 map->x68k_dm_cookie = cookie; 545 546 if (cookieflags & ID_MIGHT_NEED_BOUNCE) { 547 /* 548 * Allocate the bounce pages now if the caller 549 * wishes us to do so. 550 */ 551 if ((flags & BUS_DMA_ALLOCNOW) == 0) 552 goto out; 553 554 error = _intio_dma_alloc_bouncebuf(t, map, size, flags); 555 } 556 557 out: 558 if (error) { 559 if (map->x68k_dm_cookie != NULL) 560 free(map->x68k_dm_cookie, M_DMAMAP); 561 x68k_bus_dmamap_destroy(t, map); 562 } 563 return (error); 564 } 565 566 /* 567 * Destroy an INTIO DMA map. 568 */ 569 void 570 _intio_bus_dmamap_destroy(t, map) 571 bus_dma_tag_t t; 572 bus_dmamap_t map; 573 { 574 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 575 576 /* 577 * Free any bounce pages this map might hold. 578 */ 579 if (cookie->id_flags & ID_HAS_BOUNCE) 580 _intio_dma_free_bouncebuf(t, map); 581 582 free(cookie, M_DMAMAP); 583 x68k_bus_dmamap_destroy(t, map); 584 } 585 586 /* 587 * Load an INTIO DMA map with a linear buffer. 588 */ 589 int 590 _intio_bus_dmamap_load(t, map, buf, buflen, p, flags) 591 bus_dma_tag_t t; 592 bus_dmamap_t map; 593 void *buf; 594 bus_size_t buflen; 595 struct proc *p; 596 int flags; 597 { 598 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 599 int error; 600 601 /* 602 * Make sure that on error condition we return "no valid mappings." 603 */ 604 map->dm_mapsize = 0; 605 map->dm_nsegs = 0; 606 607 /* 608 * Try to load the map the normal way. If this errors out, 609 * and we can bounce, we will. 610 */ 611 error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags); 612 if (error == 0 || 613 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 614 return (error); 615 616 /* 617 * Allocate bounce pages, if necessary. 618 */ 619 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 620 error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags); 621 if (error) 622 return (error); 623 } 624 625 /* 626 * Cache a pointer to the caller's buffer and load the DMA map 627 * with the bounce buffer. 628 */ 629 cookie->id_origbuf = buf; 630 cookie->id_origbuflen = buflen; 631 cookie->id_buftype = ID_BUFTYPE_LINEAR; 632 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen, 633 p, flags); 634 if (error) { 635 /* 636 * Free the bounce pages, unless our resources 637 * are reserved for our exclusive use. 638 */ 639 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 640 _intio_dma_free_bouncebuf(t, map); 641 return (error); 642 } 643 644 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 645 cookie->id_flags |= ID_IS_BOUNCING; 646 return (0); 647 } 648 649 /* 650 * Like _intio_bus_dmamap_load(), but for mbufs. 651 */ 652 int 653 _intio_bus_dmamap_load_mbuf(t, map, m0, flags) 654 bus_dma_tag_t t; 655 bus_dmamap_t map; 656 struct mbuf *m0; 657 int flags; 658 { 659 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 660 int error; 661 662 /* 663 * Make sure on error condition we return "no valid mappings." 664 */ 665 map->dm_mapsize = 0; 666 map->dm_nsegs = 0; 667 668 #ifdef DIAGNOSTIC 669 if ((m0->m_flags & M_PKTHDR) == 0) 670 panic("_intio_bus_dmamap_load_mbuf: no packet header"); 671 #endif 672 673 if (m0->m_pkthdr.len > map->x68k_dm_size) 674 return (EINVAL); 675 676 /* 677 * Try to load the map the normal way. If this errors out, 678 * and we can bounce, we will. 679 */ 680 error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags); 681 if (error == 0 || 682 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 683 return (error); 684 685 /* 686 * Allocate bounce pages, if necessary. 687 */ 688 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 689 error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len, 690 flags); 691 if (error) 692 return (error); 693 } 694 695 /* 696 * Cache a pointer to the caller's buffer and load the DMA map 697 * with the bounce buffer. 698 */ 699 cookie->id_origbuf = m0; 700 cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */ 701 cookie->id_buftype = ID_BUFTYPE_MBUF; 702 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, 703 m0->m_pkthdr.len, NULL, flags); 704 if (error) { 705 /* 706 * Free the bounce pages, unless our resources 707 * are reserved for our exclusive use. 708 */ 709 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 710 _intio_dma_free_bouncebuf(t, map); 711 return (error); 712 } 713 714 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 715 cookie->id_flags |= ID_IS_BOUNCING; 716 return (0); 717 } 718 719 /* 720 * Like _intio_bus_dmamap_load(), but for uios. 721 */ 722 int 723 _intio_bus_dmamap_load_uio(t, map, uio, flags) 724 bus_dma_tag_t t; 725 bus_dmamap_t map; 726 struct uio *uio; 727 int flags; 728 { 729 panic("_intio_bus_dmamap_load_uio: not implemented"); 730 } 731 732 /* 733 * Like _intio_bus_dmamap_load(), but for raw memory allocated with 734 * bus_dmamem_alloc(). 735 */ 736 int 737 _intio_bus_dmamap_load_raw(t, map, segs, nsegs, size, flags) 738 bus_dma_tag_t t; 739 bus_dmamap_t map; 740 bus_dma_segment_t *segs; 741 int nsegs; 742 bus_size_t size; 743 int flags; 744 { 745 746 panic("_intio_bus_dmamap_load_raw: not implemented"); 747 } 748 749 /* 750 * Unload an INTIO DMA map. 751 */ 752 void 753 _intio_bus_dmamap_unload(t, map) 754 bus_dma_tag_t t; 755 bus_dmamap_t map; 756 { 757 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 758 759 /* 760 * If we have bounce pages, free them, unless they're 761 * reserved for our exclusive use. 762 */ 763 if ((cookie->id_flags & ID_HAS_BOUNCE) && 764 (map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 765 _intio_dma_free_bouncebuf(t, map); 766 767 cookie->id_flags &= ~ID_IS_BOUNCING; 768 cookie->id_buftype = ID_BUFTYPE_INVALID; 769 770 /* 771 * Do the generic bits of the unload. 772 */ 773 x68k_bus_dmamap_unload(t, map); 774 } 775 776 /* 777 * Synchronize an INTIO DMA map. 778 */ 779 void 780 _intio_bus_dmamap_sync(t, map, offset, len, ops) 781 bus_dma_tag_t t; 782 bus_dmamap_t map; 783 bus_addr_t offset; 784 bus_size_t len; 785 int ops; 786 { 787 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 788 789 /* 790 * Mixing PRE and POST operations is not allowed. 791 */ 792 if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 && 793 (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0) 794 panic("_intio_bus_dmamap_sync: mix PRE and POST"); 795 796 #ifdef DIAGNOSTIC 797 if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) { 798 if (offset >= map->dm_mapsize) 799 panic("_intio_bus_dmamap_sync: bad offset"); 800 if (len == 0 || (offset + len) > map->dm_mapsize) 801 panic("_intio_bus_dmamap_sync: bad length"); 802 } 803 #endif 804 805 /* 806 * If we're not bouncing, just return; nothing to do. 807 */ 808 if ((cookie->id_flags & ID_IS_BOUNCING) == 0) 809 return; 810 811 switch (cookie->id_buftype) { 812 case ID_BUFTYPE_LINEAR: 813 /* 814 * Nothing to do for pre-read. 815 */ 816 817 if (ops & BUS_DMASYNC_PREWRITE) { 818 /* 819 * Copy the caller's buffer to the bounce buffer. 820 */ 821 memcpy((char *)cookie->id_bouncebuf + offset, 822 (char *)cookie->id_origbuf + offset, len); 823 } 824 825 if (ops & BUS_DMASYNC_POSTREAD) { 826 /* 827 * Copy the bounce buffer to the caller's buffer. 828 */ 829 memcpy((char *)cookie->id_origbuf + offset, 830 (char *)cookie->id_bouncebuf + offset, len); 831 } 832 833 /* 834 * Nothing to do for post-write. 835 */ 836 break; 837 838 case ID_BUFTYPE_MBUF: 839 { 840 struct mbuf *m, *m0 = cookie->id_origbuf; 841 bus_size_t minlen, moff; 842 843 /* 844 * Nothing to do for pre-read. 845 */ 846 847 if (ops & BUS_DMASYNC_PREWRITE) { 848 /* 849 * Copy the caller's buffer to the bounce buffer. 850 */ 851 m_copydata(m0, offset, len, 852 (char *)cookie->id_bouncebuf + offset); 853 } 854 855 if (ops & BUS_DMASYNC_POSTREAD) { 856 /* 857 * Copy the bounce buffer to the caller's buffer. 858 */ 859 for (moff = offset, m = m0; m != NULL && len != 0; 860 m = m->m_next) { 861 /* Find the beginning mbuf. */ 862 if (moff >= m->m_len) { 863 moff -= m->m_len; 864 continue; 865 } 866 867 /* 868 * Now at the first mbuf to sync; nail 869 * each one until we have exhausted the 870 * length. 871 */ 872 minlen = len < m->m_len - moff ? 873 len : m->m_len - moff; 874 875 memcpy(mtod(m, caddr_t) + moff, 876 (char *)cookie->id_bouncebuf + offset, 877 minlen); 878 879 moff = 0; 880 len -= minlen; 881 offset += minlen; 882 } 883 } 884 885 /* 886 * Nothing to do for post-write. 887 */ 888 break; 889 } 890 891 case ID_BUFTYPE_UIO: 892 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO"); 893 break; 894 895 case ID_BUFTYPE_RAW: 896 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW"); 897 break; 898 899 case ID_BUFTYPE_INVALID: 900 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID"); 901 break; 902 903 default: 904 printf("unknown buffer type %d\n", cookie->id_buftype); 905 panic("_intio_bus_dmamap_sync"); 906 } 907 } 908 909 /* 910 * Allocate memory safe for INTIO DMA. 911 */ 912 int 913 _intio_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags) 914 bus_dma_tag_t t; 915 bus_size_t size, alignment, boundary; 916 bus_dma_segment_t *segs; 917 int nsegs; 918 int *rsegs; 919 int flags; 920 { 921 paddr_t high; 922 extern paddr_t avail_end; 923 924 if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD) 925 high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD); 926 else 927 high = trunc_page(avail_end); 928 929 return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary, 930 segs, nsegs, rsegs, flags, 0, high)); 931 } 932 933 /********************************************************************** 934 * INTIO DMA utility functions 935 **********************************************************************/ 936 937 int 938 _intio_dma_alloc_bouncebuf(t, map, size, flags) 939 bus_dma_tag_t t; 940 bus_dmamap_t map; 941 bus_size_t size; 942 int flags; 943 { 944 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 945 int error = 0; 946 947 cookie->id_bouncebuflen = round_page(size); 948 error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen, 949 PAGE_SIZE, map->x68k_dm_boundary, cookie->id_bouncesegs, 950 map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags); 951 if (error) 952 goto out; 953 error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs, 954 cookie->id_nbouncesegs, cookie->id_bouncebuflen, 955 (caddr_t *)&cookie->id_bouncebuf, flags); 956 957 out: 958 if (error) { 959 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 960 cookie->id_nbouncesegs); 961 cookie->id_bouncebuflen = 0; 962 cookie->id_nbouncesegs = 0; 963 } else { 964 cookie->id_flags |= ID_HAS_BOUNCE; 965 } 966 967 return (error); 968 } 969 970 void 971 _intio_dma_free_bouncebuf(t, map) 972 bus_dma_tag_t t; 973 bus_dmamap_t map; 974 { 975 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 976 977 x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf, 978 cookie->id_bouncebuflen); 979 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 980 cookie->id_nbouncesegs); 981 cookie->id_bouncebuflen = 0; 982 cookie->id_nbouncesegs = 0; 983 cookie->id_flags &= ~ID_HAS_BOUNCE; 984 } 985
Indexes created Wed Sep 24 05:09:52 GMT 2025