1 /* $NetBSD: intio.c,v 1.38 2008/12/18 05:56:42 isaki 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 1.38 2008/12/18 05:56:42 isaki 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 #include <arch/x68k/dev/mfp.h> 50 51 52 /* 53 * bus_space(9) interface 54 */ 55 static int intio_bus_space_map(bus_space_tag_t, bus_addr_t, bus_size_t, int, bus_space_handle_t *); 56 static void intio_bus_space_unmap(bus_space_tag_t, bus_space_handle_t, bus_size_t); 57 static int intio_bus_space_subregion(bus_space_tag_t, bus_space_handle_t, bus_size_t, bus_size_t, bus_space_handle_t *); 58 59 static struct x68k_bus_space intio_bus = { 60 #if 0 61 X68K_INTIO_BUS, 62 #endif 63 intio_bus_space_map, intio_bus_space_unmap, intio_bus_space_subregion, 64 x68k_bus_space_alloc, x68k_bus_space_free, 65 #if 0 66 x68k_bus_space_barrier, 67 #endif 68 69 0 70 }; 71 72 /* 73 * bus_dma(9) interface 74 */ 75 #define INTIO_DMA_BOUNCE_THRESHOLD (16 * 1024 * 1024) 76 int _intio_bus_dmamap_create(bus_dma_tag_t, bus_size_t, int, 77 bus_size_t, bus_size_t, int, bus_dmamap_t *); 78 void _intio_bus_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t); 79 int _intio_bus_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *, 80 bus_size_t, struct proc *, int); 81 int _intio_bus_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t, 82 struct mbuf *, int); 83 int _intio_bus_dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t, 84 struct uio *, int); 85 int _intio_bus_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t, 86 bus_dma_segment_t *, int, bus_size_t, int); 87 void _intio_bus_dmamap_unload(bus_dma_tag_t, bus_dmamap_t); 88 void _intio_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, 89 bus_addr_t, bus_size_t, int); 90 91 int _intio_bus_dmamem_alloc(bus_dma_tag_t, bus_size_t, bus_size_t, 92 bus_size_t, bus_dma_segment_t *, int, int *, int); 93 94 int _intio_dma_alloc_bouncebuf(bus_dma_tag_t, bus_dmamap_t, 95 bus_size_t, int); 96 void _intio_dma_free_bouncebuf(bus_dma_tag_t, bus_dmamap_t); 97 98 struct x68k_bus_dma intio_bus_dma = { 99 INTIO_DMA_BOUNCE_THRESHOLD, 100 _intio_bus_dmamap_create, 101 _intio_bus_dmamap_destroy, 102 _intio_bus_dmamap_load, 103 _intio_bus_dmamap_load_mbuf, 104 _intio_bus_dmamap_load_uio, 105 _intio_bus_dmamap_load_raw, 106 _intio_bus_dmamap_unload, 107 _intio_bus_dmamap_sync, 108 _intio_bus_dmamem_alloc, 109 x68k_bus_dmamem_free, 110 x68k_bus_dmamem_map, 111 x68k_bus_dmamem_unmap, 112 x68k_bus_dmamem_mmap, 113 }; 114 115 /* 116 * autoconf stuff 117 */ 118 static int intio_match(device_t, cfdata_t, void *); 119 static void intio_attach(device_t, device_t, void *); 120 static int intio_search(device_t, cfdata_t, const int *, void *); 121 static int intio_print(void *, const char *); 122 static void intio_alloc_system_ports(struct intio_softc*); 123 124 CFATTACH_DECL_NEW(intio, sizeof(struct intio_softc), 125 intio_match, intio_attach, NULL, NULL); 126 127 extern struct cfdriver intio_cd; 128 129 static int intio_attached; 130 131 static struct intio_interrupt_vector { 132 intio_intr_handler_t iiv_handler; 133 void *iiv_arg; 134 struct evcnt *iiv_evcnt; 135 } iiv[256] = {{0,},}; 136 137 /* used in console initialization */ 138 extern int x68k_realconfig; 139 int x68k_config_found(struct cfdata *, struct device *, void *, cfprint_t); 140 static cfdata_t cfdata_intiobus = NULL; 141 142 #ifdef DEBUG 143 int intio_debug = 0; 144 #endif 145 146 static int 147 intio_match(device_t parent, cfdata_t cf, void *aux) 148 { 149 150 if (strcmp(aux, intio_cd.cd_name) != 0) 151 return (0); 152 if (intio_attached) 153 return (0); 154 if (x68k_realconfig == 0) 155 cfdata_intiobus = cf; /* XXX */ 156 157 return (1); 158 } 159 160 161 /* used in console initialization: configure only MFP */ 162 static struct intio_attach_args initial_ia = { 163 &intio_bus, 164 0/*XXX*/, 165 166 "mfp", /* ia_name */ 167 MFP_ADDR, /* ia_addr */ 168 0x30, /* ia_size */ 169 MFP_INTR, /* ia_intr */ 170 -1 /* ia_dma */ 171 -1, /* ia_dmaintr */ 172 }; 173 174 static void 175 intio_attach(device_t parent, device_t self, void *aux) 176 { 177 struct intio_softc *sc = device_private(self); 178 struct intio_attach_args ia; 179 180 if (self == NULL) { 181 /* console only init */ 182 x68k_config_found(cfdata_intiobus, NULL, &initial_ia, NULL); 183 return; 184 } 185 186 intio_attached = 1; 187 188 aprint_normal(" mapped at %8p\n", intiobase); 189 190 sc->sc_map = extent_create("intiomap", 191 INTIOBASE, 192 INTIOBASE + 0x400000, 193 M_DEVBUF, NULL, 0, EX_NOWAIT); 194 intio_alloc_system_ports(sc); 195 196 sc->sc_bst = &intio_bus; 197 sc->sc_bst->x68k_bus_device = self; 198 sc->sc_dmat = &intio_bus_dma; 199 sc->sc_dmac = 0; 200 201 memset(iiv, 0, sizeof(struct intio_interrupt_vector) * 256); 202 203 ia.ia_bst = sc->sc_bst; 204 ia.ia_dmat = sc->sc_dmat; 205 206 config_search_ia(intio_search, self, "intio", &ia); 207 } 208 209 static int 210 intio_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) 211 { 212 struct intio_softc *sc = device_private(parent); 213 struct intio_attach_args *ia = aux; 214 215 ia->ia_bst = sc->sc_bst; 216 ia->ia_dmat = sc->sc_dmat; 217 ia->ia_name = cf->cf_name; 218 ia->ia_addr = cf->cf_addr; 219 ia->ia_intr = cf->cf_intr; 220 ia->ia_dma = cf->cf_dma; 221 ia->ia_dmaintr = cf->cf_dmaintr; 222 223 if (config_match(parent, cf, ia) > 0) 224 config_attach(parent, cf, ia, intio_print); 225 226 return (0); 227 } 228 229 static int 230 intio_print(void *aux, const char *name) 231 { 232 struct intio_attach_args *ia = aux; 233 234 /* if (ia->ia_addr > 0) */ 235 aprint_normal(" addr 0x%06x", ia->ia_addr); 236 if (ia->ia_intr > 0) 237 aprint_normal(" intr 0x%02x", ia->ia_intr); 238 if (ia->ia_dma >= 0) { 239 aprint_normal(" using DMA ch%d", ia->ia_dma); 240 if (ia->ia_dmaintr > 0) 241 aprint_normal(" intr 0x%02x and 0x%02x", 242 ia->ia_dmaintr, ia->ia_dmaintr+1); 243 } 244 245 return (QUIET); 246 } 247 248 /* 249 * intio memory map manager 250 */ 251 252 int 253 intio_map_allocate_region(device_t parent, struct intio_attach_args *ia, 254 enum intio_map_flag flag) 255 { 256 struct intio_softc *sc = device_private(parent); 257 struct extent *map = sc->sc_map; 258 int r; 259 260 r = extent_alloc_region(map, ia->ia_addr, ia->ia_size, 0); 261 #ifdef DEBUG 262 if (intio_debug) 263 extent_print(map); 264 #endif 265 if (r == 0) { 266 if (flag != INTIO_MAP_ALLOCATE) 267 extent_free(map, ia->ia_addr, ia->ia_size, 0); 268 return 0; 269 } 270 271 return -1; 272 } 273 274 int 275 intio_map_free_region(device_t parent, struct intio_attach_args *ia) 276 { 277 struct intio_softc *sc = device_private(parent); 278 struct extent *map = sc->sc_map; 279 280 extent_free(map, ia->ia_addr, ia->ia_size, 0); 281 #ifdef DEBUG 282 if (intio_debug) 283 extent_print(map); 284 #endif 285 return 0; 286 } 287 288 void 289 intio_alloc_system_ports(struct intio_softc *sc) 290 { 291 extent_alloc_region(sc->sc_map, INTIO_SYSPORT, 16, 0); 292 extent_alloc_region(sc->sc_map, INTIO_SICILIAN, 0x2000, 0); 293 } 294 295 296 /* 297 * intio bus space stuff. 298 */ 299 static int 300 intio_bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, 301 int flags, bus_space_handle_t *bshp) 302 { 303 /* 304 * Intio bus is mapped permanently. 305 */ 306 *bshp = (bus_space_handle_t)IIOV(bpa); 307 308 /* 309 * Some devices are mapped on odd or even addresses only. 310 */ 311 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_ODD) 312 *bshp += 0x80000001; 313 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_EVEN) 314 *bshp += 0x80000000; 315 316 return (0); 317 } 318 319 static void 320 intio_bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, 321 bus_size_t size) 322 { 323 return; 324 } 325 326 static int 327 intio_bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh, 328 bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 329 { 330 331 *nbshp = bsh + offset; 332 return (0); 333 } 334 335 336 /* 337 * interrupt handler 338 */ 339 int 340 intio_intr_establish(int vector, const char *name, intio_intr_handler_t handler, 341 void *arg) 342 { 343 344 return intio_intr_establish_ext(vector, name, "intr", handler, arg); 345 } 346 347 int 348 intio_intr_establish_ext(int vector, const char *name1, const char *name2, 349 intio_intr_handler_t handler, void *arg) 350 { 351 struct evcnt *evcnt; 352 353 if (vector < 16) 354 panic("Invalid interrupt vector"); 355 if (iiv[vector].iiv_handler) 356 return EBUSY; 357 358 evcnt = malloc(sizeof(*evcnt), M_DEVBUF, M_NOWAIT); 359 if (evcnt == NULL) 360 return ENOMEM; 361 evcnt_attach_dynamic(evcnt, EVCNT_TYPE_INTR, NULL, name1, name2); 362 363 iiv[vector].iiv_handler = handler; 364 iiv[vector].iiv_arg = arg; 365 iiv[vector].iiv_evcnt = evcnt; 366 367 return 0; 368 } 369 370 int 371 intio_intr_disestablish(int vector, void *arg) 372 { 373 if (iiv[vector].iiv_handler == 0 || iiv[vector].iiv_arg != arg) 374 return EINVAL; 375 iiv[vector].iiv_handler = 0; 376 iiv[vector].iiv_arg = 0; 377 evcnt_detach(iiv[vector].iiv_evcnt); 378 free(iiv[vector].iiv_evcnt, M_DEVBUF); 379 380 return 0; 381 } 382 383 int 384 intio_intr(struct frame *frame) 385 { 386 int vector = frame->f_vector / 4; 387 388 #if 0 /* this is not correct now */ 389 /* CAUTION: HERE WE ARE IN SPLHIGH() */ 390 /* LOWER TO APPROPRIATE IPL AT VERY FIRST IN THE HANDLER!! */ 391 #endif 392 if (iiv[vector].iiv_handler == 0) { 393 printf("Stray interrupt: %d type %x, pc %x\n", 394 vector, frame->f_format, frame->f_pc); 395 return 0; 396 } 397 398 iiv[vector].iiv_evcnt->ev_count++; 399 400 return (*(iiv[vector].iiv_handler))(iiv[vector].iiv_arg); 401 } 402 403 /* 404 * Intio I/O controller interrupt 405 */ 406 static u_int8_t intio_ivec = 0; 407 408 void 409 intio_set_ivec(int vec) 410 { 411 vec &= 0xfc; 412 413 if (intio_ivec && intio_ivec != (vec & 0xfc)) 414 panic("Wrong interrupt vector for Sicilian."); 415 416 intio_ivec = vec; 417 intio_set_sicilian_ivec(vec); 418 } 419 420 421 /* 422 * intio bus DMA stuff. stolen from arch/i386/isa/isa_machdep.c 423 */ 424 425 /* 426 * Create an INTIO DMA map. 427 */ 428 int 429 _intio_bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments, 430 bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp) 431 { 432 struct intio_dma_cookie *cookie; 433 bus_dmamap_t map; 434 int error, cookieflags; 435 void *cookiestore; 436 size_t cookiesize; 437 extern paddr_t avail_end; 438 439 /* Call common function to create the basic map. */ 440 error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 441 flags, dmamp); 442 if (error) 443 return (error); 444 445 map = *dmamp; 446 map->x68k_dm_cookie = NULL; 447 448 cookiesize = sizeof(struct intio_dma_cookie); 449 450 /* 451 * INTIO only has 24-bits of address space. This means 452 * we can't DMA to pages over 16M. In order to DMA to 453 * arbitrary buffers, we use "bounce buffers" - pages 454 * in memory below the 16M boundary. On DMA reads, 455 * DMA happens to the bounce buffers, and is copied into 456 * the caller's buffer. On writes, data is copied into 457 * but bounce buffer, and the DMA happens from those 458 * pages. To software using the DMA mapping interface, 459 * this looks simply like a data cache. 460 * 461 * If we have more than 16M of RAM in the system, we may 462 * need bounce buffers. We check and remember that here. 463 * 464 * ...or, there is an opposite case. The most segments 465 * a transfer will require is (maxxfer / PAGE_SIZE) + 1. If 466 * the caller can't handle that many segments (e.g. the 467 * DMAC), we may have to bounce it as well. 468 */ 469 if (avail_end <= t->_bounce_thresh) 470 /* Bouncing not necessary due to memory size. */ 471 map->x68k_dm_bounce_thresh = 0; 472 cookieflags = 0; 473 if (map->x68k_dm_bounce_thresh != 0 || 474 ((map->x68k_dm_size / PAGE_SIZE) + 1) > map->x68k_dm_segcnt) { 475 cookieflags |= ID_MIGHT_NEED_BOUNCE; 476 cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt); 477 } 478 479 /* 480 * Allocate our cookie. 481 */ 482 if ((cookiestore = malloc(cookiesize, M_DMAMAP, 483 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL) { 484 error = ENOMEM; 485 goto out; 486 } 487 memset(cookiestore, 0, cookiesize); 488 cookie = (struct intio_dma_cookie *)cookiestore; 489 cookie->id_flags = cookieflags; 490 map->x68k_dm_cookie = cookie; 491 492 if (cookieflags & ID_MIGHT_NEED_BOUNCE) { 493 /* 494 * Allocate the bounce pages now if the caller 495 * wishes us to do so. 496 */ 497 if ((flags & BUS_DMA_ALLOCNOW) == 0) 498 goto out; 499 500 error = _intio_dma_alloc_bouncebuf(t, map, size, flags); 501 } 502 503 out: 504 if (error) { 505 if (map->x68k_dm_cookie != NULL) 506 free(map->x68k_dm_cookie, M_DMAMAP); 507 x68k_bus_dmamap_destroy(t, map); 508 } 509 return (error); 510 } 511 512 /* 513 * Destroy an INTIO DMA map. 514 */ 515 void 516 _intio_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map) 517 { 518 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 519 520 /* 521 * Free any bounce pages this map might hold. 522 */ 523 if (cookie->id_flags & ID_HAS_BOUNCE) 524 _intio_dma_free_bouncebuf(t, map); 525 526 free(cookie, M_DMAMAP); 527 x68k_bus_dmamap_destroy(t, map); 528 } 529 530 /* 531 * Load an INTIO DMA map with a linear buffer. 532 */ 533 int 534 _intio_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 535 bus_size_t buflen, struct proc *p, int flags) 536 { 537 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 538 int error; 539 540 /* 541 * Make sure that on error condition we return "no valid mappings." 542 */ 543 map->dm_mapsize = 0; 544 map->dm_nsegs = 0; 545 546 /* 547 * Try to load the map the normal way. If this errors out, 548 * and we can bounce, we will. 549 */ 550 error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags); 551 if (error == 0 || 552 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 553 return (error); 554 555 /* 556 * Allocate bounce pages, if necessary. 557 */ 558 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 559 error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags); 560 if (error) 561 return (error); 562 } 563 564 /* 565 * Cache a pointer to the caller's buffer and load the DMA map 566 * with the bounce buffer. 567 */ 568 cookie->id_origbuf = buf; 569 cookie->id_origbuflen = buflen; 570 cookie->id_buftype = ID_BUFTYPE_LINEAR; 571 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen, 572 p, flags); 573 if (error) { 574 /* 575 * Free the bounce pages, unless our resources 576 * are reserved for our exclusive use. 577 */ 578 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 579 _intio_dma_free_bouncebuf(t, map); 580 return (error); 581 } 582 583 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 584 cookie->id_flags |= ID_IS_BOUNCING; 585 return (0); 586 } 587 588 /* 589 * Like _intio_bus_dmamap_load(), but for mbufs. 590 */ 591 int 592 _intio_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0, 593 int flags) 594 { 595 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 596 int error; 597 598 /* 599 * Make sure on error condition we return "no valid mappings." 600 */ 601 map->dm_mapsize = 0; 602 map->dm_nsegs = 0; 603 604 #ifdef DIAGNOSTIC 605 if ((m0->m_flags & M_PKTHDR) == 0) 606 panic("_intio_bus_dmamap_load_mbuf: no packet header"); 607 #endif 608 609 if (m0->m_pkthdr.len > map->x68k_dm_size) 610 return (EINVAL); 611 612 /* 613 * Try to load the map the normal way. If this errors out, 614 * and we can bounce, we will. 615 */ 616 error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags); 617 if (error == 0 || 618 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 619 return (error); 620 621 /* 622 * Allocate bounce pages, if necessary. 623 */ 624 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 625 error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len, 626 flags); 627 if (error) 628 return (error); 629 } 630 631 /* 632 * Cache a pointer to the caller's buffer and load the DMA map 633 * with the bounce buffer. 634 */ 635 cookie->id_origbuf = m0; 636 cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */ 637 cookie->id_buftype = ID_BUFTYPE_MBUF; 638 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, 639 m0->m_pkthdr.len, NULL, flags); 640 if (error) { 641 /* 642 * Free the bounce pages, unless our resources 643 * are reserved for our exclusive use. 644 */ 645 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 646 _intio_dma_free_bouncebuf(t, map); 647 return (error); 648 } 649 650 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 651 cookie->id_flags |= ID_IS_BOUNCING; 652 return (0); 653 } 654 655 /* 656 * Like _intio_bus_dmamap_load(), but for uios. 657 */ 658 int 659 _intio_bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, 660 int flags) 661 { 662 panic("_intio_bus_dmamap_load_uio: not implemented"); 663 } 664 665 /* 666 * Like _intio_bus_dmamap_load(), but for raw memory allocated with 667 * bus_dmamem_alloc(). 668 */ 669 int 670 _intio_bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map, 671 bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 672 { 673 674 panic("_intio_bus_dmamap_load_raw: not implemented"); 675 } 676 677 /* 678 * Unload an INTIO DMA map. 679 */ 680 void 681 _intio_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map) 682 { 683 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 684 685 /* 686 * If we have bounce pages, free them, unless they're 687 * reserved for our exclusive use. 688 */ 689 if ((cookie->id_flags & ID_HAS_BOUNCE) && 690 (map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 691 _intio_dma_free_bouncebuf(t, map); 692 693 cookie->id_flags &= ~ID_IS_BOUNCING; 694 cookie->id_buftype = ID_BUFTYPE_INVALID; 695 696 /* 697 * Do the generic bits of the unload. 698 */ 699 x68k_bus_dmamap_unload(t, map); 700 } 701 702 /* 703 * Synchronize an INTIO DMA map. 704 */ 705 void 706 _intio_bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset, 707 bus_size_t len, int ops) 708 { 709 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 710 711 /* 712 * Mixing PRE and POST operations is not allowed. 713 */ 714 if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 && 715 (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0) 716 panic("_intio_bus_dmamap_sync: mix PRE and POST"); 717 718 #ifdef DIAGNOSTIC 719 if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) { 720 if (offset >= map->dm_mapsize) 721 panic("_intio_bus_dmamap_sync: bad offset"); 722 if (len == 0 || (offset + len) > map->dm_mapsize) 723 panic("_intio_bus_dmamap_sync: bad length"); 724 } 725 #endif 726 727 /* 728 * If we're not bouncing, just return; nothing to do. 729 */ 730 if ((cookie->id_flags & ID_IS_BOUNCING) == 0) 731 return; 732 733 switch (cookie->id_buftype) { 734 case ID_BUFTYPE_LINEAR: 735 /* 736 * Nothing to do for pre-read. 737 */ 738 739 if (ops & BUS_DMASYNC_PREWRITE) { 740 /* 741 * Copy the caller's buffer to the bounce buffer. 742 */ 743 memcpy((char *)cookie->id_bouncebuf + offset, 744 (char *)cookie->id_origbuf + offset, len); 745 } 746 747 if (ops & BUS_DMASYNC_POSTREAD) { 748 /* 749 * Copy the bounce buffer to the caller's buffer. 750 */ 751 memcpy((char *)cookie->id_origbuf + offset, 752 (char *)cookie->id_bouncebuf + offset, len); 753 } 754 755 /* 756 * Nothing to do for post-write. 757 */ 758 break; 759 760 case ID_BUFTYPE_MBUF: 761 { 762 struct mbuf *m, *m0 = cookie->id_origbuf; 763 bus_size_t minlen, moff; 764 765 /* 766 * Nothing to do for pre-read. 767 */ 768 769 if (ops & BUS_DMASYNC_PREWRITE) { 770 /* 771 * Copy the caller's buffer to the bounce buffer. 772 */ 773 m_copydata(m0, offset, len, 774 (char *)cookie->id_bouncebuf + offset); 775 } 776 777 if (ops & BUS_DMASYNC_POSTREAD) { 778 /* 779 * Copy the bounce buffer to the caller's buffer. 780 */ 781 for (moff = offset, m = m0; m != NULL && len != 0; 782 m = m->m_next) { 783 /* Find the beginning mbuf. */ 784 if (moff >= m->m_len) { 785 moff -= m->m_len; 786 continue; 787 } 788 789 /* 790 * Now at the first mbuf to sync; nail 791 * each one until we have exhausted the 792 * length. 793 */ 794 minlen = len < m->m_len - moff ? 795 len : m->m_len - moff; 796 797 memcpy(mtod(m, char *) + moff, 798 (char *)cookie->id_bouncebuf + offset, 799 minlen); 800 801 moff = 0; 802 len -= minlen; 803 offset += minlen; 804 } 805 } 806 807 /* 808 * Nothing to do for post-write. 809 */ 810 break; 811 } 812 813 case ID_BUFTYPE_UIO: 814 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO"); 815 break; 816 817 case ID_BUFTYPE_RAW: 818 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW"); 819 break; 820 821 case ID_BUFTYPE_INVALID: 822 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID"); 823 break; 824 825 default: 826 printf("unknown buffer type %d\n", cookie->id_buftype); 827 panic("_intio_bus_dmamap_sync"); 828 } 829 } 830 831 /* 832 * Allocate memory safe for INTIO DMA. 833 */ 834 int 835 _intio_bus_dmamem_alloc(bus_dma_tag_t t, bus_size_t size, bus_size_t alignment, 836 bus_size_t boundary, bus_dma_segment_t *segs, int nsegs, int *rsegs, 837 int flags) 838 { 839 paddr_t high; 840 extern paddr_t avail_end; 841 842 if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD) 843 high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD); 844 else 845 high = trunc_page(avail_end); 846 847 return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary, 848 segs, nsegs, rsegs, flags, 0, high)); 849 } 850 851 /********************************************************************** 852 * INTIO DMA utility functions 853 **********************************************************************/ 854 855 int 856 _intio_dma_alloc_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map, bus_size_t size, 857 int flags) 858 { 859 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 860 int error = 0; 861 862 cookie->id_bouncebuflen = round_page(size); 863 error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen, 864 PAGE_SIZE, map->x68k_dm_boundary, cookie->id_bouncesegs, 865 map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags); 866 if (error) 867 goto out; 868 error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs, 869 cookie->id_nbouncesegs, cookie->id_bouncebuflen, 870 (void **)&cookie->id_bouncebuf, flags); 871 872 out: 873 if (error) { 874 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 875 cookie->id_nbouncesegs); 876 cookie->id_bouncebuflen = 0; 877 cookie->id_nbouncesegs = 0; 878 } else { 879 cookie->id_flags |= ID_HAS_BOUNCE; 880 } 881 882 return (error); 883 } 884 885 void 886 _intio_dma_free_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map) 887 { 888 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 889 890 x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf, 891 cookie->id_bouncebuflen); 892 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 893 cookie->id_nbouncesegs); 894 cookie->id_bouncebuflen = 0; 895 cookie->id_nbouncesegs = 0; 896 cookie->id_flags &= ~ID_HAS_BOUNCE; 897 } 898