intio.c revision 1.20
1 /* $NetBSD: intio.c,v 1.20 2003/07/15 01:44:51 lukem 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 1.20 2003/07/15 01:44:51 lukem 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, NULL, 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\n", vector, frame->f_format); 437 return 0; 438 } 439 440 intrcnt[iiv[vector].iiv_intrcntoff]++; 441 442 return (*(iiv[vector].iiv_handler)) (iiv[vector].iiv_arg); 443 } 444 445 /* 446 * Intio I/O controler interrupt 447 */ 448 static u_int8_t intio_ivec = 0; 449 450 void 451 intio_set_ivec (vec) 452 int vec; 453 { 454 vec &= 0xfc; 455 456 if (intio_ivec && intio_ivec != (vec & 0xfc)) 457 panic ("Wrong interrupt vector for Sicilian."); 458 459 intio_ivec = vec; 460 intio_set_sicilian_ivec(vec); 461 } 462 463 464 /* 465 * intio bus DMA stuff. stolen from arch/i386/isa/isa_machdep.c 466 */ 467 468 /* 469 * Create an INTIO DMA map. 470 */ 471 int 472 _intio_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp) 473 bus_dma_tag_t t; 474 bus_size_t size; 475 int nsegments; 476 bus_size_t maxsegsz; 477 bus_size_t boundary; 478 int flags; 479 bus_dmamap_t *dmamp; 480 { 481 struct intio_dma_cookie *cookie; 482 bus_dmamap_t map; 483 int error, cookieflags; 484 void *cookiestore; 485 size_t cookiesize; 486 extern paddr_t avail_end; 487 488 /* Call common function to create the basic map. */ 489 error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 490 flags, dmamp); 491 if (error) 492 return (error); 493 494 map = *dmamp; 495 map->x68k_dm_cookie = NULL; 496 497 cookiesize = sizeof(struct intio_dma_cookie); 498 499 /* 500 * INTIO only has 24-bits of address space. This means 501 * we can't DMA to pages over 16M. In order to DMA to 502 * arbitrary buffers, we use "bounce buffers" - pages 503 * in memory below the 16M boundary. On DMA reads, 504 * DMA happens to the bounce buffers, and is copied into 505 * the caller's buffer. On writes, data is copied into 506 * but bounce buffer, and the DMA happens from those 507 * pages. To software using the DMA mapping interface, 508 * this looks simply like a data cache. 509 * 510 * If we have more than 16M of RAM in the system, we may 511 * need bounce buffers. We check and remember that here. 512 * 513 * ...or, there is an opposite case. The most segments 514 * a transfer will require is (maxxfer / PAGE_SIZE) + 1. If 515 * the caller can't handle that many segments (e.g. the 516 * DMAC), we may have to bounce it as well. 517 */ 518 if (avail_end <= t->_bounce_thresh) 519 /* Bouncing not necessary due to memory size. */ 520 map->x68k_dm_bounce_thresh = 0; 521 cookieflags = 0; 522 if (map->x68k_dm_bounce_thresh != 0 || 523 ((map->x68k_dm_size / PAGE_SIZE) + 1) > map->x68k_dm_segcnt) { 524 cookieflags |= ID_MIGHT_NEED_BOUNCE; 525 cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt); 526 } 527 528 /* 529 * Allocate our cookie. 530 */ 531 if ((cookiestore = malloc(cookiesize, M_DMAMAP, 532 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL) { 533 error = ENOMEM; 534 goto out; 535 } 536 memset(cookiestore, 0, cookiesize); 537 cookie = (struct intio_dma_cookie *)cookiestore; 538 cookie->id_flags = cookieflags; 539 map->x68k_dm_cookie = cookie; 540 541 if (cookieflags & ID_MIGHT_NEED_BOUNCE) { 542 /* 543 * Allocate the bounce pages now if the caller 544 * wishes us to do so. 545 */ 546 if ((flags & BUS_DMA_ALLOCNOW) == 0) 547 goto out; 548 549 error = _intio_dma_alloc_bouncebuf(t, map, size, flags); 550 } 551 552 out: 553 if (error) { 554 if (map->x68k_dm_cookie != NULL) 555 free(map->x68k_dm_cookie, M_DMAMAP); 556 x68k_bus_dmamap_destroy(t, map); 557 } 558 return (error); 559 } 560 561 /* 562 * Destroy an INTIO DMA map. 563 */ 564 void 565 _intio_bus_dmamap_destroy(t, map) 566 bus_dma_tag_t t; 567 bus_dmamap_t map; 568 { 569 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 570 571 /* 572 * Free any bounce pages this map might hold. 573 */ 574 if (cookie->id_flags & ID_HAS_BOUNCE) 575 _intio_dma_free_bouncebuf(t, map); 576 577 free(cookie, M_DMAMAP); 578 x68k_bus_dmamap_destroy(t, map); 579 } 580 581 /* 582 * Load an INTIO DMA map with a linear buffer. 583 */ 584 int 585 _intio_bus_dmamap_load(t, map, buf, buflen, p, flags) 586 bus_dma_tag_t t; 587 bus_dmamap_t map; 588 void *buf; 589 bus_size_t buflen; 590 struct proc *p; 591 int flags; 592 { 593 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 594 int error; 595 596 /* 597 * Make sure that on error condition we return "no valid mappings." 598 */ 599 map->dm_mapsize = 0; 600 map->dm_nsegs = 0; 601 602 /* 603 * Try to load the map the normal way. If this errors out, 604 * and we can bounce, we will. 605 */ 606 error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags); 607 if (error == 0 || 608 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 609 return (error); 610 611 /* 612 * Allocate bounce pages, if necessary. 613 */ 614 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 615 error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags); 616 if (error) 617 return (error); 618 } 619 620 /* 621 * Cache a pointer to the caller's buffer and load the DMA map 622 * with the bounce buffer. 623 */ 624 cookie->id_origbuf = buf; 625 cookie->id_origbuflen = buflen; 626 cookie->id_buftype = ID_BUFTYPE_LINEAR; 627 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen, 628 p, flags); 629 if (error) { 630 /* 631 * Free the bounce pages, unless our resources 632 * are reserved for our exclusive use. 633 */ 634 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 635 _intio_dma_free_bouncebuf(t, map); 636 return (error); 637 } 638 639 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 640 cookie->id_flags |= ID_IS_BOUNCING; 641 return (0); 642 } 643 644 /* 645 * Like _intio_bus_dmamap_load(), but for mbufs. 646 */ 647 int 648 _intio_bus_dmamap_load_mbuf(t, map, m0, flags) 649 bus_dma_tag_t t; 650 bus_dmamap_t map; 651 struct mbuf *m0; 652 int flags; 653 { 654 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 655 int error; 656 657 /* 658 * Make sure on error condition we return "no valid mappings." 659 */ 660 map->dm_mapsize = 0; 661 map->dm_nsegs = 0; 662 663 #ifdef DIAGNOSTIC 664 if ((m0->m_flags & M_PKTHDR) == 0) 665 panic("_intio_bus_dmamap_load_mbuf: no packet header"); 666 #endif 667 668 if (m0->m_pkthdr.len > map->x68k_dm_size) 669 return (EINVAL); 670 671 /* 672 * Try to load the map the normal way. If this errors out, 673 * and we can bounce, we will. 674 */ 675 error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags); 676 if (error == 0 || 677 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 678 return (error); 679 680 /* 681 * Allocate bounce pages, if necessary. 682 */ 683 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 684 error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len, 685 flags); 686 if (error) 687 return (error); 688 } 689 690 /* 691 * Cache a pointer to the caller's buffer and load the DMA map 692 * with the bounce buffer. 693 */ 694 cookie->id_origbuf = m0; 695 cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */ 696 cookie->id_buftype = ID_BUFTYPE_MBUF; 697 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, 698 m0->m_pkthdr.len, NULL, flags); 699 if (error) { 700 /* 701 * Free the bounce pages, unless our resources 702 * are reserved for our exclusive use. 703 */ 704 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 705 _intio_dma_free_bouncebuf(t, map); 706 return (error); 707 } 708 709 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 710 cookie->id_flags |= ID_IS_BOUNCING; 711 return (0); 712 } 713 714 /* 715 * Like _intio_bus_dmamap_load(), but for uios. 716 */ 717 int 718 _intio_bus_dmamap_load_uio(t, map, uio, flags) 719 bus_dma_tag_t t; 720 bus_dmamap_t map; 721 struct uio *uio; 722 int flags; 723 { 724 panic("_intio_bus_dmamap_load_uio: not implemented"); 725 } 726 727 /* 728 * Like _intio_bus_dmamap_load(), but for raw memory allocated with 729 * bus_dmamem_alloc(). 730 */ 731 int 732 _intio_bus_dmamap_load_raw(t, map, segs, nsegs, size, flags) 733 bus_dma_tag_t t; 734 bus_dmamap_t map; 735 bus_dma_segment_t *segs; 736 int nsegs; 737 bus_size_t size; 738 int flags; 739 { 740 741 panic("_intio_bus_dmamap_load_raw: not implemented"); 742 } 743 744 /* 745 * Unload an INTIO DMA map. 746 */ 747 void 748 _intio_bus_dmamap_unload(t, map) 749 bus_dma_tag_t t; 750 bus_dmamap_t map; 751 { 752 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 753 754 /* 755 * If we have bounce pages, free them, unless they're 756 * reserved for our exclusive use. 757 */ 758 if ((cookie->id_flags & ID_HAS_BOUNCE) && 759 (map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 760 _intio_dma_free_bouncebuf(t, map); 761 762 cookie->id_flags &= ~ID_IS_BOUNCING; 763 cookie->id_buftype = ID_BUFTYPE_INVALID; 764 765 /* 766 * Do the generic bits of the unload. 767 */ 768 x68k_bus_dmamap_unload(t, map); 769 } 770 771 /* 772 * Synchronize an INTIO DMA map. 773 */ 774 void 775 _intio_bus_dmamap_sync(t, map, offset, len, ops) 776 bus_dma_tag_t t; 777 bus_dmamap_t map; 778 bus_addr_t offset; 779 bus_size_t len; 780 int ops; 781 { 782 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 783 784 /* 785 * Mixing PRE and POST operations is not allowed. 786 */ 787 if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 && 788 (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0) 789 panic("_intio_bus_dmamap_sync: mix PRE and POST"); 790 791 #ifdef DIAGNOSTIC 792 if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) { 793 if (offset >= map->dm_mapsize) 794 panic("_intio_bus_dmamap_sync: bad offset"); 795 if (len == 0 || (offset + len) > map->dm_mapsize) 796 panic("_intio_bus_dmamap_sync: bad length"); 797 } 798 #endif 799 800 /* 801 * If we're not bouncing, just return; nothing to do. 802 */ 803 if ((cookie->id_flags & ID_IS_BOUNCING) == 0) 804 return; 805 806 switch (cookie->id_buftype) { 807 case ID_BUFTYPE_LINEAR: 808 /* 809 * Nothing to do for pre-read. 810 */ 811 812 if (ops & BUS_DMASYNC_PREWRITE) { 813 /* 814 * Copy the caller's buffer to the bounce buffer. 815 */ 816 memcpy((char *)cookie->id_bouncebuf + offset, 817 (char *)cookie->id_origbuf + offset, len); 818 } 819 820 if (ops & BUS_DMASYNC_POSTREAD) { 821 /* 822 * Copy the bounce buffer to the caller's buffer. 823 */ 824 memcpy((char *)cookie->id_origbuf + offset, 825 (char *)cookie->id_bouncebuf + offset, len); 826 } 827 828 /* 829 * Nothing to do for post-write. 830 */ 831 break; 832 833 case ID_BUFTYPE_MBUF: 834 { 835 struct mbuf *m, *m0 = cookie->id_origbuf; 836 bus_size_t minlen, moff; 837 838 /* 839 * Nothing to do for pre-read. 840 */ 841 842 if (ops & BUS_DMASYNC_PREWRITE) { 843 /* 844 * Copy the caller's buffer to the bounce buffer. 845 */ 846 m_copydata(m0, offset, len, 847 (char *)cookie->id_bouncebuf + offset); 848 } 849 850 if (ops & BUS_DMASYNC_POSTREAD) { 851 /* 852 * Copy the bounce buffer to the caller's buffer. 853 */ 854 for (moff = offset, m = m0; m != NULL && len != 0; 855 m = m->m_next) { 856 /* Find the beginning mbuf. */ 857 if (moff >= m->m_len) { 858 moff -= m->m_len; 859 continue; 860 } 861 862 /* 863 * Now at the first mbuf to sync; nail 864 * each one until we have exhausted the 865 * length. 866 */ 867 minlen = len < m->m_len - moff ? 868 len : m->m_len - moff; 869 870 memcpy(mtod(m, caddr_t) + moff, 871 (char *)cookie->id_bouncebuf + offset, 872 minlen); 873 874 moff = 0; 875 len -= minlen; 876 offset += minlen; 877 } 878 } 879 880 /* 881 * Nothing to do for post-write. 882 */ 883 break; 884 } 885 886 case ID_BUFTYPE_UIO: 887 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO"); 888 break; 889 890 case ID_BUFTYPE_RAW: 891 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW"); 892 break; 893 894 case ID_BUFTYPE_INVALID: 895 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID"); 896 break; 897 898 default: 899 printf("unknown buffer type %d\n", cookie->id_buftype); 900 panic("_intio_bus_dmamap_sync"); 901 } 902 } 903 904 /* 905 * Allocate memory safe for INTIO DMA. 906 */ 907 int 908 _intio_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags) 909 bus_dma_tag_t t; 910 bus_size_t size, alignment, boundary; 911 bus_dma_segment_t *segs; 912 int nsegs; 913 int *rsegs; 914 int flags; 915 { 916 paddr_t high; 917 extern paddr_t avail_end; 918 919 if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD) 920 high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD); 921 else 922 high = trunc_page(avail_end); 923 924 return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary, 925 segs, nsegs, rsegs, flags, 0, high)); 926 } 927 928 /********************************************************************** 929 * INTIO DMA utility functions 930 **********************************************************************/ 931 932 int 933 _intio_dma_alloc_bouncebuf(t, map, size, flags) 934 bus_dma_tag_t t; 935 bus_dmamap_t map; 936 bus_size_t size; 937 int flags; 938 { 939 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 940 int error = 0; 941 942 cookie->id_bouncebuflen = round_page(size); 943 error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen, 944 PAGE_SIZE, map->x68k_dm_boundary, cookie->id_bouncesegs, 945 map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags); 946 if (error) 947 goto out; 948 error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs, 949 cookie->id_nbouncesegs, cookie->id_bouncebuflen, 950 (caddr_t *)&cookie->id_bouncebuf, flags); 951 952 out: 953 if (error) { 954 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 955 cookie->id_nbouncesegs); 956 cookie->id_bouncebuflen = 0; 957 cookie->id_nbouncesegs = 0; 958 } else { 959 cookie->id_flags |= ID_HAS_BOUNCE; 960 } 961 962 return (error); 963 } 964 965 void 966 _intio_dma_free_bouncebuf(t, map) 967 bus_dma_tag_t t; 968 bus_dmamap_t map; 969 { 970 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 971 972 x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf, 973 cookie->id_bouncebuflen); 974 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 975 cookie->id_nbouncesegs); 976 cookie->id_bouncebuflen = 0; 977 cookie->id_nbouncesegs = 0; 978 cookie->id_flags &= ~ID_HAS_BOUNCE; 979 } 980
Indexes created Tue Sep 23 14:10:03 GMT 2025