intio.c revision 1.47.4.2
1 /* $NetBSD: intio.c,v 1.47.4.2 2021/03/21 17:35:48 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * NetBSD/x68k internal I/O virtual bus. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: intio.c,v 1.47.4.2 2021/03/21 17:35:48 thorpej Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/extent.h> 42 #include <uvm/uvm_extern.h> 43 44 #include <machine/bus.h> 45 #include <machine/cpu.h> 46 #include <machine/frame.h> 47 48 #include <arch/x68k/dev/intiovar.h> 49 50 51 /* 52 * bus_space(9) interface 53 */ 54 static int intio_bus_space_map(bus_space_tag_t, bus_addr_t, bus_size_t, int, bus_space_handle_t *); 55 static void intio_bus_space_unmap(bus_space_tag_t, bus_space_handle_t, bus_size_t); 56 static int intio_bus_space_subregion(bus_space_tag_t, bus_space_handle_t, bus_size_t, bus_size_t, bus_space_handle_t *); 57 58 static struct x68k_bus_space intio_bus = { 59 #if 0 60 X68K_INTIO_BUS, 61 #endif 62 intio_bus_space_map, intio_bus_space_unmap, intio_bus_space_subregion, 63 x68k_bus_space_alloc, x68k_bus_space_free, 64 #if 0 65 x68k_bus_space_barrier, 66 #endif 67 68 0 69 }; 70 71 /* 72 * bus_dma(9) interface 73 */ 74 #define INTIO_DMA_BOUNCE_THRESHOLD (16 * 1024 * 1024) 75 int _intio_bus_dmamap_create(bus_dma_tag_t, bus_size_t, int, 76 bus_size_t, bus_size_t, int, bus_dmamap_t *); 77 void _intio_bus_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t); 78 int _intio_bus_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *, 79 bus_size_t, struct proc *, int); 80 int _intio_bus_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t, 81 struct mbuf *, int); 82 int _intio_bus_dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t, 83 struct uio *, int); 84 int _intio_bus_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t, 85 bus_dma_segment_t *, int, bus_size_t, int); 86 void _intio_bus_dmamap_unload(bus_dma_tag_t, bus_dmamap_t); 87 void _intio_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, 88 bus_addr_t, bus_size_t, int); 89 90 int _intio_bus_dmamem_alloc(bus_dma_tag_t, bus_size_t, bus_size_t, 91 bus_size_t, bus_dma_segment_t *, int, int *, int); 92 93 int _intio_dma_alloc_bouncebuf(bus_dma_tag_t, bus_dmamap_t, 94 bus_size_t, int); 95 void _intio_dma_free_bouncebuf(bus_dma_tag_t, bus_dmamap_t); 96 97 struct x68k_bus_dma intio_bus_dma = { 98 INTIO_DMA_BOUNCE_THRESHOLD, 99 _intio_bus_dmamap_create, 100 _intio_bus_dmamap_destroy, 101 _intio_bus_dmamap_load, 102 _intio_bus_dmamap_load_mbuf, 103 _intio_bus_dmamap_load_uio, 104 _intio_bus_dmamap_load_raw, 105 _intio_bus_dmamap_unload, 106 _intio_bus_dmamap_sync, 107 _intio_bus_dmamem_alloc, 108 x68k_bus_dmamem_free, 109 x68k_bus_dmamem_map, 110 x68k_bus_dmamem_unmap, 111 x68k_bus_dmamem_mmap, 112 }; 113 114 /* 115 * autoconf stuff 116 */ 117 static int intio_match(device_t, cfdata_t, void *); 118 static void intio_attach(device_t, device_t, void *); 119 static int intio_search(device_t, cfdata_t, const int *, void *); 120 static int intio_print(void *, const char *); 121 static void intio_alloc_system_ports(struct intio_softc*); 122 123 CFATTACH_DECL_NEW(intio, sizeof(struct intio_softc), 124 intio_match, intio_attach, NULL, NULL); 125 126 extern struct cfdriver intio_cd; 127 128 static int intio_attached; 129 130 static struct intio_interrupt_vector { 131 intio_intr_handler_t iiv_handler; 132 void *iiv_arg; 133 struct evcnt *iiv_evcnt; 134 } iiv[256] = {{0,},}; 135 136 #ifdef DEBUG 137 int intio_debug = 0; 138 #endif 139 140 static int 141 intio_match(device_t parent, cfdata_t cf, void *aux) 142 { 143 144 if (strcmp(aux, intio_cd.cd_name) != 0) 145 return (0); 146 if (intio_attached) 147 return (0); 148 149 return (1); 150 } 151 152 static void 153 intio_attach(device_t parent, device_t self, void *aux) 154 { 155 struct intio_softc *sc = device_private(self); 156 struct intio_attach_args ia; 157 158 intio_attached = 1; 159 160 aprint_normal(" mapped at %8p\n", intiobase); 161 162 sc->sc_map = extent_create("intiomap", 163 INTIOBASE, 164 INTIOBASE + 0x400000, 165 NULL, 0, EX_WAITOK); 166 intio_alloc_system_ports(sc); 167 168 sc->sc_bst = &intio_bus; 169 sc->sc_bst->x68k_bus_device = self; 170 sc->sc_dmat = &intio_bus_dma; 171 sc->sc_dmac = 0; 172 173 memset(iiv, 0, sizeof(struct intio_interrupt_vector) * 256); 174 175 ia.ia_bst = sc->sc_bst; 176 ia.ia_dmat = sc->sc_dmat; 177 178 config_search(self, &ia, 179 CFARG_SUBMATCH, intio_search, 180 CFARG_EOL); 181 } 182 183 static int 184 intio_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) 185 { 186 struct intio_softc *sc = device_private(parent); 187 struct intio_attach_args *ia = aux; 188 189 ia->ia_bst = sc->sc_bst; 190 ia->ia_dmat = sc->sc_dmat; 191 ia->ia_name = cf->cf_name; 192 ia->ia_addr = cf->cf_addr; 193 ia->ia_intr = cf->cf_intr; 194 ia->ia_dma = cf->cf_dma; 195 ia->ia_dmaintr = cf->cf_dmaintr; 196 197 if (config_match(parent, cf, ia) > 0) 198 config_attach(parent, cf, ia, intio_print); 199 200 return (0); 201 } 202 203 static int 204 intio_print(void *aux, const char *name) 205 { 206 struct intio_attach_args *ia = aux; 207 208 /* if (ia->ia_addr > 0) */ 209 aprint_normal(" addr 0x%06x", ia->ia_addr); 210 if (ia->ia_intr > 0) 211 aprint_normal(" intr 0x%02x", ia->ia_intr); 212 if (ia->ia_dma >= 0) { 213 aprint_normal(" using DMA ch%d", ia->ia_dma); 214 if (ia->ia_dmaintr > 0) 215 aprint_normal(" intr 0x%02x and 0x%02x", 216 ia->ia_dmaintr, ia->ia_dmaintr+1); 217 } 218 219 return (QUIET); 220 } 221 222 /* 223 * intio memory map manager 224 */ 225 226 int 227 intio_map_allocate_region(device_t parent, struct intio_attach_args *ia, 228 enum intio_map_flag flag) 229 { 230 struct intio_softc *sc = device_private(parent); 231 struct extent *map = sc->sc_map; 232 int r; 233 234 r = extent_alloc_region(map, ia->ia_addr, ia->ia_size, 0); 235 #ifdef DEBUG 236 if (intio_debug) 237 extent_print(map); 238 #endif 239 if (r == 0) { 240 if (flag != INTIO_MAP_ALLOCATE) 241 extent_free(map, ia->ia_addr, ia->ia_size, 0); 242 return 0; 243 } 244 245 return -1; 246 } 247 248 int 249 intio_map_free_region(device_t parent, struct intio_attach_args *ia) 250 { 251 struct intio_softc *sc = device_private(parent); 252 struct extent *map = sc->sc_map; 253 254 extent_free(map, ia->ia_addr, ia->ia_size, 0); 255 #ifdef DEBUG 256 if (intio_debug) 257 extent_print(map); 258 #endif 259 return 0; 260 } 261 262 void 263 intio_alloc_system_ports(struct intio_softc *sc) 264 { 265 extent_alloc_region(sc->sc_map, INTIO_SYSPORT, 16, 0); 266 extent_alloc_region(sc->sc_map, INTIO_SICILIAN, 0x2000, 0); 267 } 268 269 270 /* 271 * intio bus space stuff. 272 */ 273 static int 274 intio_bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, 275 int flags, bus_space_handle_t *bshp) 276 { 277 /* 278 * Intio bus is mapped permanently. 279 */ 280 *bshp = (bus_space_handle_t)IIOV(bpa); 281 282 /* 283 * Some devices are mapped on odd or even addresses only. 284 */ 285 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_ODD) 286 *bshp += 0x80000001; 287 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_EVEN) 288 *bshp += 0x80000000; 289 290 return (0); 291 } 292 293 static void 294 intio_bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, 295 bus_size_t size) 296 { 297 return; 298 } 299 300 static int 301 intio_bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh, 302 bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 303 { 304 305 *nbshp = bsh + offset; 306 return (0); 307 } 308 309 310 /* 311 * interrupt handler 312 */ 313 int 314 intio_intr_establish(int vector, const char *name, intio_intr_handler_t handler, 315 void *arg) 316 { 317 318 return intio_intr_establish_ext(vector, name, "intr", handler, arg); 319 } 320 321 int 322 intio_intr_establish_ext(int vector, const char *name1, const char *name2, 323 intio_intr_handler_t handler, void *arg) 324 { 325 struct evcnt *evcnt; 326 327 if (vector < 16) 328 panic("Invalid interrupt vector"); 329 if (iiv[vector].iiv_handler) 330 return EBUSY; 331 332 evcnt = malloc(sizeof(*evcnt), M_DEVBUF, M_WAITOK); 333 evcnt_attach_dynamic(evcnt, EVCNT_TYPE_INTR, NULL, name1, name2); 334 335 iiv[vector].iiv_handler = handler; 336 iiv[vector].iiv_arg = arg; 337 iiv[vector].iiv_evcnt = evcnt; 338 339 return 0; 340 } 341 342 int 343 intio_intr_disestablish(int vector, void *arg) 344 { 345 if (iiv[vector].iiv_handler == 0 || iiv[vector].iiv_arg != arg) 346 return EINVAL; 347 iiv[vector].iiv_handler = 0; 348 iiv[vector].iiv_arg = 0; 349 evcnt_detach(iiv[vector].iiv_evcnt); 350 free(iiv[vector].iiv_evcnt, M_DEVBUF); 351 352 return 0; 353 } 354 355 int 356 intio_intr(struct frame *frame) 357 { 358 int vector = frame->f_vector / 4; 359 360 if (iiv[vector].iiv_handler == 0) { 361 printf("Stray interrupt: %d type %x, pc %x\n", 362 vector, frame->f_format, frame->f_pc); 363 return 0; 364 } 365 366 iiv[vector].iiv_evcnt->ev_count++; 367 368 return (*(iiv[vector].iiv_handler))(iiv[vector].iiv_arg); 369 } 370 371 /* 372 * Intio I/O controller interrupt 373 */ 374 static u_int8_t intio_ivec = 0; 375 376 void 377 intio_set_ivec(int vec) 378 { 379 vec &= 0xfc; 380 381 if (intio_ivec && intio_ivec != (vec & 0xfc)) 382 panic("Wrong interrupt vector for Sicilian."); 383 384 intio_ivec = vec; 385 intio_set_sicilian_ivec(vec); 386 } 387 388 389 /* 390 * intio bus DMA stuff. stolen from arch/i386/isa/isa_machdep.c 391 */ 392 393 /* 394 * Create an INTIO DMA map. 395 */ 396 int 397 _intio_bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments, 398 bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp) 399 { 400 struct intio_dma_cookie *cookie; 401 bus_dmamap_t map; 402 int error, cookieflags; 403 size_t cookiesize; 404 extern paddr_t avail_end; 405 406 /* Call common function to create the basic map. */ 407 error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 408 flags, dmamp); 409 if (error) 410 return (error); 411 412 map = *dmamp; 413 map->x68k_dm_cookie = NULL; 414 415 cookiesize = sizeof(struct intio_dma_cookie); 416 417 /* 418 * INTIO only has 24-bits of address space. This means 419 * we can't DMA to pages over 16M. In order to DMA to 420 * arbitrary buffers, we use "bounce buffers" - pages 421 * in memory below the 16M boundary. On DMA reads, 422 * DMA happens to the bounce buffers, and is copied into 423 * the caller's buffer. On writes, data is copied into 424 * but bounce buffer, and the DMA happens from those 425 * pages. To software using the DMA mapping interface, 426 * this looks simply like a data cache. 427 * 428 * If we have more than 16M of RAM in the system, we may 429 * need bounce buffers. We check and remember that here. 430 * 431 * ...or, there is an opposite case. The most segments 432 * a transfer will require is (maxxfer / PAGE_SIZE) + 1. If 433 * the caller can't handle that many segments (e.g. the 434 * DMAC), we may have to bounce it as well. 435 */ 436 if (avail_end <= t->_bounce_thresh) 437 /* Bouncing not necessary due to memory size. */ 438 map->x68k_dm_bounce_thresh = 0; 439 cookieflags = 0; 440 if (map->x68k_dm_bounce_thresh != 0 || 441 ((map->x68k_dm_size / PAGE_SIZE) + 1) > map->x68k_dm_segcnt) { 442 cookieflags |= ID_MIGHT_NEED_BOUNCE; 443 cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt); 444 } 445 446 /* 447 * Allocate our cookie. 448 */ 449 cookie = malloc(cookiesize, M_DMAMAP, 450 ((flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK) | M_ZERO); 451 if (cookie == NULL) { 452 error = ENOMEM; 453 goto out; 454 } 455 cookie->id_flags = cookieflags; 456 map->x68k_dm_cookie = cookie; 457 458 if (cookieflags & ID_MIGHT_NEED_BOUNCE) { 459 /* 460 * Allocate the bounce pages now if the caller 461 * wishes us to do so. 462 */ 463 if ((flags & BUS_DMA_ALLOCNOW) == 0) 464 goto out; 465 466 error = _intio_dma_alloc_bouncebuf(t, map, size, flags); 467 } 468 469 out: 470 if (error) { 471 if (map->x68k_dm_cookie != NULL) 472 free(map->x68k_dm_cookie, M_DMAMAP); 473 x68k_bus_dmamap_destroy(t, map); 474 } 475 return (error); 476 } 477 478 /* 479 * Destroy an INTIO DMA map. 480 */ 481 void 482 _intio_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map) 483 { 484 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 485 486 /* 487 * Free any bounce pages this map might hold. 488 */ 489 if (cookie->id_flags & ID_HAS_BOUNCE) 490 _intio_dma_free_bouncebuf(t, map); 491 492 free(cookie, M_DMAMAP); 493 x68k_bus_dmamap_destroy(t, map); 494 } 495 496 /* 497 * Load an INTIO DMA map with a linear buffer. 498 */ 499 int 500 _intio_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 501 bus_size_t buflen, struct proc *p, int flags) 502 { 503 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 504 int error; 505 506 /* 507 * Make sure that on error condition we return "no valid mappings." 508 */ 509 map->dm_mapsize = 0; 510 map->dm_nsegs = 0; 511 512 /* 513 * Try to load the map the normal way. If this errors out, 514 * and we can bounce, we will. 515 */ 516 error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags); 517 if (error == 0 || (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0) 518 return (error); 519 520 /* 521 * Allocate bounce pages, if necessary. 522 */ 523 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 524 error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags); 525 if (error) 526 return (error); 527 } 528 529 /* 530 * Cache a pointer to the caller's buffer and load the DMA map 531 * with the bounce buffer. 532 */ 533 cookie->id_origbuf = buf; 534 cookie->id_origbuflen = buflen; 535 cookie->id_buftype = ID_BUFTYPE_LINEAR; 536 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen, 537 p, flags); 538 if (error) { 539 /* 540 * Free the bounce pages, unless our resources 541 * are reserved for our exclusive use. 542 */ 543 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 544 _intio_dma_free_bouncebuf(t, map); 545 return (error); 546 } 547 548 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 549 cookie->id_flags |= ID_IS_BOUNCING; 550 return (0); 551 } 552 553 /* 554 * Like _intio_bus_dmamap_load(), but for mbufs. 555 */ 556 int 557 _intio_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0, 558 int flags) 559 { 560 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 561 int error; 562 563 /* 564 * Make sure on error condition we return "no valid mappings." 565 */ 566 map->dm_mapsize = 0; 567 map->dm_nsegs = 0; 568 569 #ifdef DIAGNOSTIC 570 if ((m0->m_flags & M_PKTHDR) == 0) 571 panic("_intio_bus_dmamap_load_mbuf: no packet header"); 572 #endif 573 574 if (m0->m_pkthdr.len > map->x68k_dm_size) 575 return (EINVAL); 576 577 /* 578 * Try to load the map the normal way. If this errors out, 579 * and we can bounce, we will. 580 */ 581 error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags); 582 if (error == 0 || (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0) 583 return (error); 584 585 /* 586 * Allocate bounce pages, if necessary. 587 */ 588 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 589 error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len, 590 flags); 591 if (error) 592 return (error); 593 } 594 595 /* 596 * Cache a pointer to the caller's buffer and load the DMA map 597 * with the bounce buffer. 598 */ 599 cookie->id_origbuf = m0; 600 cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */ 601 cookie->id_buftype = ID_BUFTYPE_MBUF; 602 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, 603 m0->m_pkthdr.len, NULL, flags); 604 if (error) { 605 /* 606 * Free the bounce pages, unless our resources 607 * are reserved for our exclusive use. 608 */ 609 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 610 _intio_dma_free_bouncebuf(t, map); 611 return (error); 612 } 613 614 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 615 cookie->id_flags |= ID_IS_BOUNCING; 616 return (0); 617 } 618 619 /* 620 * Like _intio_bus_dmamap_load(), but for uios. 621 */ 622 int 623 _intio_bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, 624 int flags) 625 { 626 panic("_intio_bus_dmamap_load_uio: not implemented"); 627 } 628 629 /* 630 * Like _intio_bus_dmamap_load(), but for raw memory allocated with 631 * bus_dmamem_alloc(). 632 */ 633 int 634 _intio_bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map, 635 bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 636 { 637 638 panic("_intio_bus_dmamap_load_raw: not implemented"); 639 } 640 641 /* 642 * Unload an INTIO DMA map. 643 */ 644 void 645 _intio_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map) 646 { 647 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 648 649 /* 650 * If we have bounce pages, free them, unless they're 651 * reserved for our exclusive use. 652 */ 653 if ((cookie->id_flags & ID_HAS_BOUNCE) && 654 (map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 655 _intio_dma_free_bouncebuf(t, map); 656 657 cookie->id_flags &= ~ID_IS_BOUNCING; 658 cookie->id_buftype = ID_BUFTYPE_INVALID; 659 660 /* 661 * Do the generic bits of the unload. 662 */ 663 x68k_bus_dmamap_unload(t, map); 664 } 665 666 /* 667 * Synchronize an INTIO DMA map. 668 */ 669 void 670 _intio_bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset, 671 bus_size_t len, int ops) 672 { 673 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 674 675 /* 676 * Mixing PRE and POST operations is not allowed. 677 */ 678 if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 && 679 (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0) 680 panic("_intio_bus_dmamap_sync: mix PRE and POST"); 681 682 #ifdef DIAGNOSTIC 683 if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) { 684 if (offset >= map->dm_mapsize) 685 panic("_intio_bus_dmamap_sync: bad offset"); 686 if (len == 0 || (offset + len) > map->dm_mapsize) 687 panic("_intio_bus_dmamap_sync: bad length"); 688 } 689 #endif 690 691 /* 692 * If we're not bouncing, just return; nothing to do. 693 */ 694 if ((cookie->id_flags & ID_IS_BOUNCING) == 0) 695 return; 696 697 switch (cookie->id_buftype) { 698 case ID_BUFTYPE_LINEAR: 699 /* 700 * Nothing to do for pre-read. 701 */ 702 703 if (ops & BUS_DMASYNC_PREWRITE) { 704 /* 705 * Copy the caller's buffer to the bounce buffer. 706 */ 707 memcpy((char *)cookie->id_bouncebuf + offset, 708 (char *)cookie->id_origbuf + offset, len); 709 } 710 711 if (ops & BUS_DMASYNC_POSTREAD) { 712 /* 713 * Copy the bounce buffer to the caller's buffer. 714 */ 715 memcpy((char *)cookie->id_origbuf + offset, 716 (char *)cookie->id_bouncebuf + offset, len); 717 } 718 719 /* 720 * Nothing to do for post-write. 721 */ 722 break; 723 724 case ID_BUFTYPE_MBUF: 725 { 726 struct mbuf *m, *m0 = cookie->id_origbuf; 727 bus_size_t minlen, moff; 728 729 /* 730 * Nothing to do for pre-read. 731 */ 732 733 if (ops & BUS_DMASYNC_PREWRITE) { 734 /* 735 * Copy the caller's buffer to the bounce buffer. 736 */ 737 m_copydata(m0, offset, len, 738 (char *)cookie->id_bouncebuf + offset); 739 } 740 741 if (ops & BUS_DMASYNC_POSTREAD) { 742 /* 743 * Copy the bounce buffer to the caller's buffer. 744 */ 745 for (moff = offset, m = m0; m != NULL && len != 0; 746 m = m->m_next) { 747 /* Find the beginning mbuf. */ 748 if (moff >= m->m_len) { 749 moff -= m->m_len; 750 continue; 751 } 752 753 /* 754 * Now at the first mbuf to sync; nail 755 * each one until we have exhausted the 756 * length. 757 */ 758 minlen = len < m->m_len - moff ? 759 len : m->m_len - moff; 760 761 memcpy(mtod(m, char *) + moff, 762 (char *)cookie->id_bouncebuf + offset, 763 minlen); 764 765 moff = 0; 766 len -= minlen; 767 offset += minlen; 768 } 769 } 770 771 /* 772 * Nothing to do for post-write. 773 */ 774 break; 775 } 776 777 case ID_BUFTYPE_UIO: 778 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO"); 779 break; 780 781 case ID_BUFTYPE_RAW: 782 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW"); 783 break; 784 785 case ID_BUFTYPE_INVALID: 786 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID"); 787 break; 788 789 default: 790 printf("unknown buffer type %d\n", cookie->id_buftype); 791 panic("_intio_bus_dmamap_sync"); 792 } 793 } 794 795 /* 796 * Allocate memory safe for INTIO DMA. 797 */ 798 int 799 _intio_bus_dmamem_alloc(bus_dma_tag_t t, bus_size_t size, bus_size_t alignment, 800 bus_size_t boundary, bus_dma_segment_t *segs, int nsegs, int *rsegs, 801 int flags) 802 { 803 paddr_t high; 804 extern paddr_t avail_end; 805 806 if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD) 807 high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD); 808 else 809 high = trunc_page(avail_end); 810 811 return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary, 812 segs, nsegs, rsegs, flags, 0, high)); 813 } 814 815 /********************************************************************** 816 * INTIO DMA utility functions 817 **********************************************************************/ 818 819 int 820 _intio_dma_alloc_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map, bus_size_t size, 821 int flags) 822 { 823 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 824 int error = 0; 825 826 cookie->id_bouncebuflen = round_page(size); 827 error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen, 828 PAGE_SIZE, map->x68k_dm_boundary, cookie->id_bouncesegs, 829 map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags); 830 if (error) 831 goto out; 832 error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs, 833 cookie->id_nbouncesegs, cookie->id_bouncebuflen, 834 (void **)&cookie->id_bouncebuf, flags); 835 836 out: 837 if (error) { 838 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 839 cookie->id_nbouncesegs); 840 cookie->id_bouncebuflen = 0; 841 cookie->id_nbouncesegs = 0; 842 } else { 843 cookie->id_flags |= ID_HAS_BOUNCE; 844 } 845 846 return (error); 847 } 848 849 void 850 _intio_dma_free_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map) 851 { 852 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 853 854 x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf, 855 cookie->id_bouncebuflen); 856 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 857 cookie->id_nbouncesegs); 858 cookie->id_bouncebuflen = 0; 859 cookie->id_nbouncesegs = 0; 860 cookie->id_flags &= ~ID_HAS_BOUNCE; 861 } 862
Indexes created Thu Oct 02 14:10:14 GMT 2025