intio.c revision 1.23
1 /* $NetBSD: intio.c,v 1.23 2004/01/04 16:19:44 wiz 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 1.23 2004/01/04 16:19:44 wiz 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 static struct intio_interrupt_vector { 135 intio_intr_handler_t iiv_handler; 136 void *iiv_arg; 137 int iiv_intrcntoff; 138 } iiv[256] = {{0,},}; 139 140 extern struct cfdriver intio_cd; 141 142 /* used in console initialization */ 143 extern int x68k_realconfig; 144 int x68k_config_found __P((struct cfdata *, struct device *, 145 void *, cfprint_t)); 146 static struct cfdata *cfdata_intiobus = NULL; 147 148 /* other static functions */ 149 static int scan_intrnames __P((const char *)); 150 #ifdef DEBUG 151 int intio_debug = 0; 152 #endif 153 154 static int 155 intio_match(parent, cf, aux) 156 struct device *parent; 157 struct cfdata *cf; 158 void *aux; /* NULL */ 159 { 160 if (strcmp(aux, intio_cd.cd_name) != 0) 161 return (0); 162 if (cf->cf_unit != 0) 163 return (0); 164 if (x68k_realconfig == 0) 165 cfdata_intiobus = cf; /* XXX */ 166 167 return (1); 168 } 169 170 171 /* used in console initialization: configure only MFP */ 172 static struct intio_attach_args initial_ia = { 173 &intio_bus, 174 0/*XXX*/, 175 176 "mfp", /* ia_name */ 177 MFP_ADDR, /* ia_addr */ 178 0x30, /* ia_size */ 179 MFP_INTR, /* ia_intr */ 180 -1 /* ia_dma */ 181 -1, /* ia_dmaintr */ 182 }; 183 184 static void 185 intio_attach(parent, self, aux) 186 struct device *parent, *self; 187 void *aux; /* NULL */ 188 { 189 struct intio_softc *sc = (struct intio_softc *)self; 190 struct intio_attach_args ia; 191 192 if (self == NULL) { 193 /* console only init */ 194 x68k_config_found(cfdata_intiobus, NULL, &initial_ia, NULL); 195 return; 196 } 197 198 printf (" mapped at %8p\n", intiobase); 199 200 sc->sc_map = extent_create("intiomap", 201 PHYS_INTIODEV, 202 PHYS_INTIODEV + 0x400000, 203 M_DEVBUF, NULL, 0, EX_NOWAIT); 204 intio_alloc_system_ports (sc); 205 206 sc->sc_bst = &intio_bus; 207 sc->sc_bst->x68k_bus_device = self; 208 sc->sc_dmat = &intio_bus_dma; 209 sc->sc_dmac = 0; 210 211 memset(iiv, 0, sizeof (struct intio_interrupt_vector) * 256); 212 213 ia.ia_bst = sc->sc_bst; 214 ia.ia_dmat = sc->sc_dmat; 215 216 config_search (intio_search, self, &ia); 217 } 218 219 static int 220 intio_search(parent, cf, aux) 221 struct device *parent; 222 struct cfdata *cf; 223 void *aux; 224 { 225 struct intio_attach_args *ia = aux; 226 struct intio_softc *sc = (struct intio_softc *)parent; 227 228 ia->ia_bst = sc->sc_bst; 229 ia->ia_dmat = sc->sc_dmat; 230 ia->ia_name = cf->cf_name; 231 ia->ia_addr = cf->cf_addr; 232 ia->ia_intr = cf->cf_intr; 233 ia->ia_dma = cf->cf_dma; 234 ia->ia_dmaintr = cf->cf_dmaintr; 235 236 if (config_match(parent, cf, ia) > 0) 237 config_attach(parent, cf, ia, intio_print); 238 239 return (0); 240 } 241 242 static int 243 intio_print(aux, name) 244 void *aux; 245 const char *name; 246 { 247 struct intio_attach_args *ia = aux; 248 249 /* if (ia->ia_addr > 0) */ 250 aprint_normal (" addr 0x%06x", ia->ia_addr); 251 if (ia->ia_intr > 0) 252 aprint_normal (" intr 0x%02x", ia->ia_intr); 253 if (ia->ia_dma >= 0) { 254 aprint_normal (" using DMA ch%d", ia->ia_dma); 255 if (ia->ia_dmaintr > 0) 256 aprint_normal (" intr 0x%02x and 0x%02x", 257 ia->ia_dmaintr, ia->ia_dmaintr+1); 258 } 259 260 return (QUIET); 261 } 262 263 /* 264 * intio memory map manager 265 */ 266 267 int 268 intio_map_allocate_region(parent, ia, flag) 269 struct device *parent; 270 struct intio_attach_args *ia; 271 enum intio_map_flag flag; /* INTIO_MAP_TESTONLY or INTIO_MAP_ALLOCATE */ 272 { 273 struct intio_softc *sc = (struct intio_softc*) parent; 274 struct extent *map = sc->sc_map; 275 int r; 276 277 r = extent_alloc_region (map, ia->ia_addr, ia->ia_size, 0); 278 #ifdef DEBUG 279 if (intio_debug) 280 extent_print (map); 281 #endif 282 if (r == 0) { 283 if (flag != INTIO_MAP_ALLOCATE) 284 extent_free (map, ia->ia_addr, ia->ia_size, 0); 285 return 0; 286 } 287 288 return -1; 289 } 290 291 int 292 intio_map_free_region(parent, ia) 293 struct device *parent; 294 struct intio_attach_args *ia; 295 { 296 struct intio_softc *sc = (struct intio_softc*) parent; 297 struct extent *map = sc->sc_map; 298 299 extent_free (map, ia->ia_addr, ia->ia_size, 0); 300 #ifdef DEBUG 301 if (intio_debug) 302 extent_print (map); 303 #endif 304 return 0; 305 } 306 307 void 308 intio_alloc_system_ports(sc) 309 struct intio_softc *sc; 310 { 311 extent_alloc_region (sc->sc_map, INTIO_SYSPORT, 16, 0); 312 extent_alloc_region (sc->sc_map, INTIO_SICILIAN, 0x2000, 0); 313 } 314 315 316 /* 317 * intio bus space stuff. 318 */ 319 static int 320 intio_bus_space_map(t, bpa, size, flags, bshp) 321 bus_space_tag_t t; 322 bus_addr_t bpa; 323 bus_size_t size; 324 int flags; 325 bus_space_handle_t *bshp; 326 { 327 /* 328 * Intio bus is mapped permanently. 329 */ 330 *bshp = (bus_space_handle_t) 331 ((u_int) bpa - PHYS_INTIODEV + intiobase); 332 /* 333 * Some devices are mapped on odd or even addresses only. 334 */ 335 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_ODD) 336 *bshp += 0x80000001; 337 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_EVEN) 338 *bshp += 0x80000000; 339 340 return (0); 341 } 342 343 static void 344 intio_bus_space_unmap(t, bsh, size) 345 bus_space_tag_t t; 346 bus_space_handle_t bsh; 347 bus_size_t size; 348 { 349 return; 350 } 351 352 static int 353 intio_bus_space_subregion(t, bsh, offset, size, nbshp) 354 bus_space_tag_t t; 355 bus_space_handle_t bsh; 356 bus_size_t offset, size; 357 bus_space_handle_t *nbshp; 358 { 359 360 *nbshp = bsh + offset; 361 return (0); 362 } 363 364 365 /* 366 * interrupt handler 367 */ 368 int 369 intio_intr_establish (vector, name, handler, arg) 370 int vector; 371 const char *name; /* XXX */ 372 intio_intr_handler_t handler; 373 void *arg; 374 { 375 if (vector < 16) 376 panic ("Invalid interrupt vector"); 377 if (iiv[vector].iiv_handler) 378 return EBUSY; 379 iiv[vector].iiv_handler = handler; 380 iiv[vector].iiv_arg = arg; 381 iiv[vector].iiv_intrcntoff = scan_intrnames(name); 382 383 return 0; 384 } 385 386 static int 387 scan_intrnames (name) 388 const char *name; 389 { 390 extern char intrnames[]; 391 extern char eintrnames[]; 392 int r = 0; 393 char *p = &intrnames[0]; 394 395 for (;;) { 396 if (*p == 0) { /* new intr */ 397 if (p + strlen(name) >= eintrnames) 398 panic ("Interrupt statics buffer overrun."); 399 strcpy (p, name); 400 break; 401 } 402 if (strcmp(p, name) == 0) 403 break; 404 r++; 405 while (*p++ != 0); 406 } 407 408 return r; 409 } 410 411 int 412 intio_intr_disestablish (vector, arg) 413 int vector; 414 void *arg; 415 { 416 if (iiv[vector].iiv_handler == 0 || iiv[vector].iiv_arg != arg) 417 return EINVAL; 418 iiv[vector].iiv_handler = 0; 419 iiv[vector].iiv_arg = 0; 420 421 return 0; 422 } 423 424 int 425 intio_intr (frame) 426 struct frame *frame; 427 { 428 int vector = frame->f_vector / 4; 429 extern int intrcnt[]; 430 431 #if 0 /* this is not correct now */ 432 /* CAUTION: HERE WE ARE IN SPLHIGH() */ 433 /* LOWER TO APPROPRIATE IPL AT VERY FIRST IN THE HANDLER!! */ 434 #endif 435 if (iiv[vector].iiv_handler == 0) { 436 printf ("Stray interrupt: %d type %x, pc %x\n", 437 vector, frame->f_format, frame->f_pc); 438 return 0; 439 } 440 441 intrcnt[iiv[vector].iiv_intrcntoff]++; 442 443 return (*(iiv[vector].iiv_handler)) (iiv[vector].iiv_arg); 444 } 445 446 /* 447 * Intio I/O controller interrupt 448 */ 449 static u_int8_t intio_ivec = 0; 450 451 void 452 intio_set_ivec (vec) 453 int vec; 454 { 455 vec &= 0xfc; 456 457 if (intio_ivec && intio_ivec != (vec & 0xfc)) 458 panic ("Wrong interrupt vector for Sicilian."); 459 460 intio_ivec = vec; 461 intio_set_sicilian_ivec(vec); 462 } 463 464 465 /* 466 * intio bus DMA stuff. stolen from arch/i386/isa/isa_machdep.c 467 */ 468 469 /* 470 * Create an INTIO DMA map. 471 */ 472 int 473 _intio_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp) 474 bus_dma_tag_t t; 475 bus_size_t size; 476 int nsegments; 477 bus_size_t maxsegsz; 478 bus_size_t boundary; 479 int flags; 480 bus_dmamap_t *dmamp; 481 { 482 struct intio_dma_cookie *cookie; 483 bus_dmamap_t map; 484 int error, cookieflags; 485 void *cookiestore; 486 size_t cookiesize; 487 extern paddr_t avail_end; 488 489 /* Call common function to create the basic map. */ 490 error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 491 flags, dmamp); 492 if (error) 493 return (error); 494 495 map = *dmamp; 496 map->x68k_dm_cookie = NULL; 497 498 cookiesize = sizeof(struct intio_dma_cookie); 499 500 /* 501 * INTIO only has 24-bits of address space. This means 502 * we can't DMA to pages over 16M. In order to DMA to 503 * arbitrary buffers, we use "bounce buffers" - pages 504 * in memory below the 16M boundary. On DMA reads, 505 * DMA happens to the bounce buffers, and is copied into 506 * the caller's buffer. On writes, data is copied into 507 * but bounce buffer, and the DMA happens from those 508 * pages. To software using the DMA mapping interface, 509 * this looks simply like a data cache. 510 * 511 * If we have more than 16M of RAM in the system, we may 512 * need bounce buffers. We check and remember that here. 513 * 514 * ...or, there is an opposite case. The most segments 515 * a transfer will require is (maxxfer / PAGE_SIZE) + 1. If 516 * the caller can't handle that many segments (e.g. the 517 * DMAC), we may have to bounce it as well. 518 */ 519 if (avail_end <= t->_bounce_thresh) 520 /* Bouncing not necessary due to memory size. */ 521 map->x68k_dm_bounce_thresh = 0; 522 cookieflags = 0; 523 if (map->x68k_dm_bounce_thresh != 0 || 524 ((map->x68k_dm_size / PAGE_SIZE) + 1) > map->x68k_dm_segcnt) { 525 cookieflags |= ID_MIGHT_NEED_BOUNCE; 526 cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt); 527 } 528 529 /* 530 * Allocate our cookie. 531 */ 532 if ((cookiestore = malloc(cookiesize, M_DMAMAP, 533 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL) { 534 error = ENOMEM; 535 goto out; 536 } 537 memset(cookiestore, 0, cookiesize); 538 cookie = (struct intio_dma_cookie *)cookiestore; 539 cookie->id_flags = cookieflags; 540 map->x68k_dm_cookie = cookie; 541 542 if (cookieflags & ID_MIGHT_NEED_BOUNCE) { 543 /* 544 * Allocate the bounce pages now if the caller 545 * wishes us to do so. 546 */ 547 if ((flags & BUS_DMA_ALLOCNOW) == 0) 548 goto out; 549 550 error = _intio_dma_alloc_bouncebuf(t, map, size, flags); 551 } 552 553 out: 554 if (error) { 555 if (map->x68k_dm_cookie != NULL) 556 free(map->x68k_dm_cookie, M_DMAMAP); 557 x68k_bus_dmamap_destroy(t, map); 558 } 559 return (error); 560 } 561 562 /* 563 * Destroy an INTIO DMA map. 564 */ 565 void 566 _intio_bus_dmamap_destroy(t, map) 567 bus_dma_tag_t t; 568 bus_dmamap_t map; 569 { 570 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 571 572 /* 573 * Free any bounce pages this map might hold. 574 */ 575 if (cookie->id_flags & ID_HAS_BOUNCE) 576 _intio_dma_free_bouncebuf(t, map); 577 578 free(cookie, M_DMAMAP); 579 x68k_bus_dmamap_destroy(t, map); 580 } 581 582 /* 583 * Load an INTIO DMA map with a linear buffer. 584 */ 585 int 586 _intio_bus_dmamap_load(t, map, buf, buflen, p, flags) 587 bus_dma_tag_t t; 588 bus_dmamap_t map; 589 void *buf; 590 bus_size_t buflen; 591 struct proc *p; 592 int flags; 593 { 594 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 595 int error; 596 597 /* 598 * Make sure that on error condition we return "no valid mappings." 599 */ 600 map->dm_mapsize = 0; 601 map->dm_nsegs = 0; 602 603 /* 604 * Try to load the map the normal way. If this errors out, 605 * and we can bounce, we will. 606 */ 607 error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags); 608 if (error == 0 || 609 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 610 return (error); 611 612 /* 613 * Allocate bounce pages, if necessary. 614 */ 615 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 616 error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags); 617 if (error) 618 return (error); 619 } 620 621 /* 622 * Cache a pointer to the caller's buffer and load the DMA map 623 * with the bounce buffer. 624 */ 625 cookie->id_origbuf = buf; 626 cookie->id_origbuflen = buflen; 627 cookie->id_buftype = ID_BUFTYPE_LINEAR; 628 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen, 629 p, flags); 630 if (error) { 631 /* 632 * Free the bounce pages, unless our resources 633 * are reserved for our exclusive use. 634 */ 635 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 636 _intio_dma_free_bouncebuf(t, map); 637 return (error); 638 } 639 640 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 641 cookie->id_flags |= ID_IS_BOUNCING; 642 return (0); 643 } 644 645 /* 646 * Like _intio_bus_dmamap_load(), but for mbufs. 647 */ 648 int 649 _intio_bus_dmamap_load_mbuf(t, map, m0, flags) 650 bus_dma_tag_t t; 651 bus_dmamap_t map; 652 struct mbuf *m0; 653 int flags; 654 { 655 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 656 int error; 657 658 /* 659 * Make sure on error condition we return "no valid mappings." 660 */ 661 map->dm_mapsize = 0; 662 map->dm_nsegs = 0; 663 664 #ifdef DIAGNOSTIC 665 if ((m0->m_flags & M_PKTHDR) == 0) 666 panic("_intio_bus_dmamap_load_mbuf: no packet header"); 667 #endif 668 669 if (m0->m_pkthdr.len > map->x68k_dm_size) 670 return (EINVAL); 671 672 /* 673 * Try to load the map the normal way. If this errors out, 674 * and we can bounce, we will. 675 */ 676 error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags); 677 if (error == 0 || 678 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 679 return (error); 680 681 /* 682 * Allocate bounce pages, if necessary. 683 */ 684 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 685 error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len, 686 flags); 687 if (error) 688 return (error); 689 } 690 691 /* 692 * Cache a pointer to the caller's buffer and load the DMA map 693 * with the bounce buffer. 694 */ 695 cookie->id_origbuf = m0; 696 cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */ 697 cookie->id_buftype = ID_BUFTYPE_MBUF; 698 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, 699 m0->m_pkthdr.len, NULL, flags); 700 if (error) { 701 /* 702 * Free the bounce pages, unless our resources 703 * are reserved for our exclusive use. 704 */ 705 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 706 _intio_dma_free_bouncebuf(t, map); 707 return (error); 708 } 709 710 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 711 cookie->id_flags |= ID_IS_BOUNCING; 712 return (0); 713 } 714 715 /* 716 * Like _intio_bus_dmamap_load(), but for uios. 717 */ 718 int 719 _intio_bus_dmamap_load_uio(t, map, uio, flags) 720 bus_dma_tag_t t; 721 bus_dmamap_t map; 722 struct uio *uio; 723 int flags; 724 { 725 panic("_intio_bus_dmamap_load_uio: not implemented"); 726 } 727 728 /* 729 * Like _intio_bus_dmamap_load(), but for raw memory allocated with 730 * bus_dmamem_alloc(). 731 */ 732 int 733 _intio_bus_dmamap_load_raw(t, map, segs, nsegs, size, flags) 734 bus_dma_tag_t t; 735 bus_dmamap_t map; 736 bus_dma_segment_t *segs; 737 int nsegs; 738 bus_size_t size; 739 int flags; 740 { 741 742 panic("_intio_bus_dmamap_load_raw: not implemented"); 743 } 744 745 /* 746 * Unload an INTIO DMA map. 747 */ 748 void 749 _intio_bus_dmamap_unload(t, map) 750 bus_dma_tag_t t; 751 bus_dmamap_t map; 752 { 753 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 754 755 /* 756 * If we have bounce pages, free them, unless they're 757 * reserved for our exclusive use. 758 */ 759 if ((cookie->id_flags & ID_HAS_BOUNCE) && 760 (map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 761 _intio_dma_free_bouncebuf(t, map); 762 763 cookie->id_flags &= ~ID_IS_BOUNCING; 764 cookie->id_buftype = ID_BUFTYPE_INVALID; 765 766 /* 767 * Do the generic bits of the unload. 768 */ 769 x68k_bus_dmamap_unload(t, map); 770 } 771 772 /* 773 * Synchronize an INTIO DMA map. 774 */ 775 void 776 _intio_bus_dmamap_sync(t, map, offset, len, ops) 777 bus_dma_tag_t t; 778 bus_dmamap_t map; 779 bus_addr_t offset; 780 bus_size_t len; 781 int ops; 782 { 783 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 784 785 /* 786 * Mixing PRE and POST operations is not allowed. 787 */ 788 if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 && 789 (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0) 790 panic("_intio_bus_dmamap_sync: mix PRE and POST"); 791 792 #ifdef DIAGNOSTIC 793 if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) { 794 if (offset >= map->dm_mapsize) 795 panic("_intio_bus_dmamap_sync: bad offset"); 796 if (len == 0 || (offset + len) > map->dm_mapsize) 797 panic("_intio_bus_dmamap_sync: bad length"); 798 } 799 #endif 800 801 /* 802 * If we're not bouncing, just return; nothing to do. 803 */ 804 if ((cookie->id_flags & ID_IS_BOUNCING) == 0) 805 return; 806 807 switch (cookie->id_buftype) { 808 case ID_BUFTYPE_LINEAR: 809 /* 810 * Nothing to do for pre-read. 811 */ 812 813 if (ops & BUS_DMASYNC_PREWRITE) { 814 /* 815 * Copy the caller's buffer to the bounce buffer. 816 */ 817 memcpy((char *)cookie->id_bouncebuf + offset, 818 (char *)cookie->id_origbuf + offset, len); 819 } 820 821 if (ops & BUS_DMASYNC_POSTREAD) { 822 /* 823 * Copy the bounce buffer to the caller's buffer. 824 */ 825 memcpy((char *)cookie->id_origbuf + offset, 826 (char *)cookie->id_bouncebuf + offset, len); 827 } 828 829 /* 830 * Nothing to do for post-write. 831 */ 832 break; 833 834 case ID_BUFTYPE_MBUF: 835 { 836 struct mbuf *m, *m0 = cookie->id_origbuf; 837 bus_size_t minlen, moff; 838 839 /* 840 * Nothing to do for pre-read. 841 */ 842 843 if (ops & BUS_DMASYNC_PREWRITE) { 844 /* 845 * Copy the caller's buffer to the bounce buffer. 846 */ 847 m_copydata(m0, offset, len, 848 (char *)cookie->id_bouncebuf + offset); 849 } 850 851 if (ops & BUS_DMASYNC_POSTREAD) { 852 /* 853 * Copy the bounce buffer to the caller's buffer. 854 */ 855 for (moff = offset, m = m0; m != NULL && len != 0; 856 m = m->m_next) { 857 /* Find the beginning mbuf. */ 858 if (moff >= m->m_len) { 859 moff -= m->m_len; 860 continue; 861 } 862 863 /* 864 * Now at the first mbuf to sync; nail 865 * each one until we have exhausted the 866 * length. 867 */ 868 minlen = len < m->m_len - moff ? 869 len : m->m_len - moff; 870 871 memcpy(mtod(m, caddr_t) + moff, 872 (char *)cookie->id_bouncebuf + offset, 873 minlen); 874 875 moff = 0; 876 len -= minlen; 877 offset += minlen; 878 } 879 } 880 881 /* 882 * Nothing to do for post-write. 883 */ 884 break; 885 } 886 887 case ID_BUFTYPE_UIO: 888 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO"); 889 break; 890 891 case ID_BUFTYPE_RAW: 892 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW"); 893 break; 894 895 case ID_BUFTYPE_INVALID: 896 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID"); 897 break; 898 899 default: 900 printf("unknown buffer type %d\n", cookie->id_buftype); 901 panic("_intio_bus_dmamap_sync"); 902 } 903 } 904 905 /* 906 * Allocate memory safe for INTIO DMA. 907 */ 908 int 909 _intio_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags) 910 bus_dma_tag_t t; 911 bus_size_t size, alignment, boundary; 912 bus_dma_segment_t *segs; 913 int nsegs; 914 int *rsegs; 915 int flags; 916 { 917 paddr_t high; 918 extern paddr_t avail_end; 919 920 if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD) 921 high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD); 922 else 923 high = trunc_page(avail_end); 924 925 return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary, 926 segs, nsegs, rsegs, flags, 0, high)); 927 } 928 929 /********************************************************************** 930 * INTIO DMA utility functions 931 **********************************************************************/ 932 933 int 934 _intio_dma_alloc_bouncebuf(t, map, size, flags) 935 bus_dma_tag_t t; 936 bus_dmamap_t map; 937 bus_size_t size; 938 int flags; 939 { 940 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 941 int error = 0; 942 943 cookie->id_bouncebuflen = round_page(size); 944 error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen, 945 PAGE_SIZE, map->x68k_dm_boundary, cookie->id_bouncesegs, 946 map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags); 947 if (error) 948 goto out; 949 error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs, 950 cookie->id_nbouncesegs, cookie->id_bouncebuflen, 951 (caddr_t *)&cookie->id_bouncebuf, flags); 952 953 out: 954 if (error) { 955 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 956 cookie->id_nbouncesegs); 957 cookie->id_bouncebuflen = 0; 958 cookie->id_nbouncesegs = 0; 959 } else { 960 cookie->id_flags |= ID_HAS_BOUNCE; 961 } 962 963 return (error); 964 } 965 966 void 967 _intio_dma_free_bouncebuf(t, map) 968 bus_dma_tag_t t; 969 bus_dmamap_t map; 970 { 971 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 972 973 x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf, 974 cookie->id_bouncebuflen); 975 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 976 cookie->id_nbouncesegs); 977 cookie->id_bouncebuflen = 0; 978 cookie->id_nbouncesegs = 0; 979 cookie->id_flags &= ~ID_HAS_BOUNCE; 980 } 981
Indexes created Sun Sep 21 20:09:37 GMT 2025