1 /* $NetBSD: bus_space.c,v 1.28 2009/11/07 07:27:43 cegger Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: bus_space.c,v 1.28 2009/11/07 07:27:43 cegger Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/malloc.h> 39 #include <sys/extent.h> 40 41 #include <uvm/uvm_extern.h> 42 43 #include <mips/cache.h> 44 #include <mips/pte.h> 45 #include <machine/bus.h> 46 #include <machine/bus_space_hpcmips.h> 47 48 #ifdef BUS_SPACE_DEBUG 49 #define DPRINTF(arg) printf arg 50 #else 51 #define DPRINTF(arg) 52 #endif 53 54 #define MAX_BUSSPACE_TAG 10 55 56 /* proto types */ 57 bus_space_handle_t __hpcmips_cacheable(struct bus_space_tag_hpcmips*, 58 bus_addr_t, bus_size_t, int); 59 bus_space_protos(_); 60 bus_space_protos(bs_notimpl); 61 62 /* variables */ 63 static struct bus_space_tag_hpcmips __bus_space[MAX_BUSSPACE_TAG]; 64 static int __bus_space_index; 65 static struct bus_space_tag_hpcmips __sys_bus_space = { 66 { 67 NULL, 68 { 69 /* mapping/unmapping */ 70 __bs_map, 71 __bs_unmap, 72 __bs_subregion, 73 74 /* allocation/deallocation */ 75 __bs_alloc, 76 __bs_free, 77 78 /* get kernel virtual address */ 79 bs_notimpl_bs_vaddr, /* there is no linear mapping */ 80 81 /* Mmap bus space for user */ 82 bs_notimpl_bs_mmap, 83 84 /* barrier */ 85 __bs_barrier, 86 87 /* probe */ 88 __bs_peek, 89 __bs_poke, 90 91 /* read (single) */ 92 __bs_r_1, 93 __bs_r_2, 94 __bs_r_4, 95 bs_notimpl_bs_r_8, 96 97 /* read multiple */ 98 __bs_rm_1, 99 __bs_rm_2, 100 __bs_rm_4, 101 bs_notimpl_bs_rm_8, 102 103 /* read region */ 104 __bs_rr_1, 105 __bs_rr_2, 106 __bs_rr_4, 107 bs_notimpl_bs_rr_8, 108 109 /* write (single) */ 110 __bs_w_1, 111 __bs_w_2, 112 __bs_w_4, 113 bs_notimpl_bs_w_8, 114 115 /* write multiple */ 116 __bs_wm_1, 117 __bs_wm_2, 118 __bs_wm_4, 119 bs_notimpl_bs_wm_8, 120 121 /* write region */ 122 __bs_wr_1, 123 __bs_wr_2, 124 __bs_wr_4, 125 bs_notimpl_bs_wr_8, 126 127 /* set multi */ 128 __bs_sm_1, 129 __bs_sm_2, 130 __bs_sm_4, 131 bs_notimpl_bs_sm_8, 132 133 /* set region */ 134 __bs_sr_1, 135 __bs_sr_2, 136 __bs_sr_4, 137 bs_notimpl_bs_sr_8, 138 139 /* copy */ 140 __bs_c_1, 141 __bs_c_2, 142 __bs_c_4, 143 bs_notimpl_bs_c_8, 144 }, 145 }, 146 147 "whole bus space", /* bus name */ 148 0, /* extent base */ 149 0xffffffff, /* extent size */ 150 NULL, /* pointer for extent structure */ 151 }; 152 static bus_space_tag_t __sys_bus_space_tag = &__sys_bus_space.bst; 153 154 bus_space_tag_t 155 hpcmips_system_bus_space(void) 156 { 157 158 return (__sys_bus_space_tag); 159 } 160 161 struct bus_space_tag_hpcmips * 162 hpcmips_system_bus_space_hpcmips(void) 163 { 164 165 return (&__sys_bus_space); 166 } 167 168 struct bus_space_tag_hpcmips * 169 hpcmips_alloc_bus_space_tag(void) 170 { 171 172 if (__bus_space_index >= MAX_BUSSPACE_TAG) { 173 panic("hpcmips_internal_alloc_bus_space_tag: tag full."); 174 } 175 176 return (&__bus_space[__bus_space_index++]); 177 } 178 179 void 180 hpcmips_init_bus_space(struct bus_space_tag_hpcmips *t, 181 struct bus_space_tag_hpcmips *basetag, 182 const char *name, u_int32_t base, u_int32_t size) 183 { 184 u_int32_t pa, endpa; 185 vaddr_t va; 186 187 if (basetag != NULL) 188 memcpy(t, basetag, sizeof(struct bus_space_tag_hpcmips)); 189 strncpy(t->name, name, sizeof(t->name)); 190 t->name[sizeof(t->name) - 1] = '\0'; 191 t->base = base; 192 t->size = size; 193 194 /* 195 * If request physical address is greater than 512MByte, 196 * mapping it to kseg2. 197 */ 198 if (t->base >= 0x20000000) { 199 pa = mips_trunc_page(t->base); 200 endpa = mips_round_page(t->base + t->size); 201 202 if (!(va = uvm_km_alloc(kernel_map, endpa - pa, 0, 203 UVM_KMF_VAONLY))) { 204 panic("hpcmips_init_bus_space_extent:" 205 "can't allocate kernel virtual"); 206 } 207 DPRINTF(("pa:0x%08x -> kv:0x%08x+0x%08x", 208 (unsigned int)t->base, (unsigned int)va, t->size)); 209 t->base = va; /* kseg2 addr */ 210 211 for (; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) { 212 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0); 213 } 214 pmap_update(pmap_kernel()); 215 } 216 217 t->extent = (void*)extent_create(t->name, t->base, 218 t->base + t->size, M_DEVBUF, 219 0, 0, EX_NOWAIT); 220 if (!t->extent) { 221 panic("hpcmips_init_bus_space_extent:" 222 "unable to allocate %s map", t->name); 223 } 224 } 225 226 bus_space_handle_t 227 __hpcmips_cacheable(struct bus_space_tag_hpcmips *t, bus_addr_t bpa, 228 bus_size_t size, int cacheable) 229 { 230 vaddr_t va, endva; 231 pt_entry_t *pte; 232 u_int32_t opte, npte; 233 234 if (t->base >= MIPS_KSEG2_START) { 235 va = mips_trunc_page(bpa); 236 endva = mips_round_page(bpa + size); 237 npte = CPUISMIPS3 ? MIPS3_PG_UNCACHED : MIPS1_PG_N; 238 239 mips_dcache_wbinv_range(va, endva - va); 240 241 for (; va < endva; va += PAGE_SIZE) { 242 pte = kvtopte(va); 243 opte = pte->pt_entry; 244 if (cacheable) { 245 opte &= ~npte; 246 } else { 247 opte |= npte; 248 } 249 pte->pt_entry = opte; 250 /* 251 * Update the same virtual address entry. 252 */ 253 MachTLBUpdate(va, opte); 254 } 255 return (bpa); 256 } 257 258 return (cacheable ? MIPS_PHYS_TO_KSEG0(bpa) : MIPS_PHYS_TO_KSEG1(bpa)); 259 } 260 261 /* ARGSUSED */ 262 int 263 __bs_map(bus_space_tag_t tx, bus_addr_t bpa, bus_size_t size, int flags, 264 bus_space_handle_t *bshp) 265 { 266 struct bus_space_tag_hpcmips *t = (struct bus_space_tag_hpcmips *)tx; 267 int err; 268 int cacheable = flags & BUS_SPACE_MAP_CACHEABLE; 269 270 DPRINTF(("\tbus_space_map:%#lx(%#lx)+%#lx\n", 271 bpa, bpa + t->base, size)); 272 273 if (!t->extent) { /* Before autoconfiguration, can't use extent */ 274 DPRINTF(("bus_space_map: map temporary region:" 275 "0x%08lx-0x%08lx\n", bpa, bpa+size)); 276 bpa += t->base; 277 } else { 278 bpa += t->base; 279 if ((err = extent_alloc_region(t->extent, bpa, size, 280 EX_NOWAIT|EX_MALLOCOK))) { 281 DPRINTF(("\tbus_space_map: " 282 "extent_alloc_regiion() failed\n")); 283 return (err); 284 } 285 } 286 *bshp = __hpcmips_cacheable(t, bpa, size, cacheable); 287 288 return (0); 289 } 290 291 /* ARGSUSED */ 292 void 293 __bs_unmap(bus_space_tag_t tx, bus_space_handle_t bsh, bus_size_t size) 294 { 295 struct bus_space_tag_hpcmips *t = (struct bus_space_tag_hpcmips *)tx; 296 int err; 297 u_int32_t addr; 298 299 if (!t->extent) { 300 return; /* Before autoconfiguration, can't use extent */ 301 } 302 303 if (t->base < MIPS_KSEG2_START) { 304 addr = MIPS_KSEG1_TO_PHYS(bsh); 305 } else { 306 addr = bsh; 307 } 308 309 if ((err = extent_free(t->extent, addr, size, EX_NOWAIT))) { 310 DPRINTF(("warning: %#lx-%#lx of %s space lost\n", 311 bsh, bsh+size, t->name)); 312 } 313 } 314 315 /* ARGSUSED */ 316 int 317 __bs_subregion(bus_space_tag_t t, bus_space_handle_t bsh, 318 bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 319 { 320 321 *nbshp = bsh + offset; 322 323 return (0); 324 } 325 326 /* ARGSUSED */ 327 int 328 __bs_alloc(bus_space_tag_t tx, bus_addr_t rstart, bus_addr_t rend, 329 bus_size_t size, bus_size_t alignment, bus_size_t boundary, int flags, 330 bus_addr_t *bpap, bus_space_handle_t *bshp) 331 { 332 struct bus_space_tag_hpcmips *t = (struct bus_space_tag_hpcmips *)tx; 333 int cacheable = flags & BUS_SPACE_MAP_CACHEABLE; 334 u_long bpa; 335 int err; 336 337 if (!t->extent) 338 panic("bus_space_alloc: no extent"); 339 340 DPRINTF(("\tbus_space_alloc:%#lx(%#lx)+%#lx\n", bpa, 341 bpa - t->base, size)); 342 343 rstart += t->base; 344 rend += t->base; 345 if ((err = extent_alloc_subregion(t->extent, rstart, rend, size, 346 alignment, boundary, EX_FAST|EX_NOWAIT|EX_MALLOCOK, &bpa))) { 347 return (err); 348 } 349 350 *bshp = __hpcmips_cacheable(t, bpa, size, cacheable); 351 352 if (bpap) { 353 *bpap = bpa; 354 } 355 356 return (0); 357 } 358 359 /* ARGSUSED */ 360 void 361 __bs_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size) 362 { 363 /* bus_space_unmap() does all that we need to do. */ 364 bus_space_unmap(t, bsh, size); 365 } 366 367 void 368 __bs_barrier(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 369 bus_size_t len, int flags) 370 { 371 wbflush(); 372 } 373 374 int 375 __bs_peek(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 376 size_t size, void *ptr) 377 { 378 u_int32_t tmp; 379 380 if (badaddr((void *)(bsh + offset), size)) 381 return (-1); 382 383 if (ptr == NULL) 384 ptr = &tmp; 385 386 switch(size) { 387 case 1: 388 *((u_int8_t *)ptr) = bus_space_read_1(t, bsh, offset); 389 break; 390 case 2: 391 *((u_int16_t *)ptr) = bus_space_read_2(t, bsh, offset); 392 break; 393 case 4: 394 *((u_int32_t *)ptr) = bus_space_read_4(t, bsh, offset); 395 break; 396 default: 397 panic("bus_space_peek: bad size, %d", size); 398 } 399 400 return (0); 401 } 402 403 int 404 __bs_poke(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 405 size_t size, u_int32_t val) 406 { 407 408 if (badaddr((void *)(bsh + offset), size)) 409 return (-1); 410 411 switch(size) { 412 case 1: 413 bus_space_write_1(t, bsh, offset, val); 414 break; 415 case 2: 416 bus_space_write_2(t, bsh, offset, val); 417 break; 418 case 4: 419 bus_space_write_4(t, bsh, offset, val); 420 break; 421 default: 422 panic("bus_space_poke: bad size, %d", size); 423 } 424 425 return (0); 426 } 427 428 u_int8_t 429 __bs_r_1(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset) 430 { 431 wbflush(); 432 return (*(volatile u_int8_t *)(bsh + offset)); 433 } 434 435 u_int16_t 436 __bs_r_2(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset) 437 { 438 wbflush(); 439 return (*(volatile u_int16_t *)(bsh + offset)); 440 } 441 442 u_int32_t 443 __bs_r_4(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset) 444 { 445 wbflush(); 446 return (*(volatile u_int32_t *)(bsh + offset)); 447 } 448 449 void 450 __bs_rm_1(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 451 u_int8_t *addr, bus_size_t count) { 452 while (count--) 453 *addr++ = bus_space_read_1(t, bsh, offset); 454 } 455 456 void 457 __bs_rm_2(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 458 u_int16_t *addr, bus_size_t count) 459 { 460 while (count--) 461 *addr++ = bus_space_read_2(t, bsh, offset); 462 } 463 464 void 465 __bs_rm_4(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 466 u_int32_t *addr, bus_size_t count) 467 { 468 while (count--) 469 *addr++ = bus_space_read_4(t, bsh, offset); 470 } 471 472 void 473 __bs_rr_1(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 474 u_int8_t *addr, bus_size_t count) 475 { 476 while (count--) { 477 *addr++ = bus_space_read_1(t, bsh, offset); 478 offset += sizeof(*addr); 479 } 480 } 481 482 void 483 __bs_rr_2(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 484 u_int16_t *addr, bus_size_t count) 485 { 486 while (count--) { 487 *addr++ = bus_space_read_2(t, bsh, offset); 488 offset += sizeof(*addr); 489 } 490 } 491 492 void 493 __bs_rr_4(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 494 u_int32_t *addr, bus_size_t count) 495 { 496 while (count--) { 497 *addr++ = bus_space_read_4(t, bsh, offset); 498 offset += sizeof(*addr); 499 } 500 } 501 502 void 503 __bs_w_1(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 504 u_int8_t value) 505 { 506 *(volatile u_int8_t *)(bsh + offset) = value; 507 wbflush(); 508 } 509 510 void 511 __bs_w_2(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 512 u_int16_t value) 513 { 514 *(volatile u_int16_t *)(bsh + offset) = value; 515 wbflush(); 516 } 517 518 void 519 __bs_w_4(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 520 u_int32_t value) 521 { 522 *(volatile u_int32_t *)(bsh + offset) = value; 523 wbflush(); 524 } 525 526 void 527 __bs_wm_1(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 528 const u_int8_t *addr, bus_size_t count) 529 { 530 while (count--) 531 bus_space_write_1(t, bsh, offset, *addr++); 532 } 533 534 void 535 __bs_wm_2(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 536 const u_int16_t *addr, bus_size_t count) 537 { 538 while (count--) 539 bus_space_write_2(t, bsh, offset, *addr++); 540 } 541 542 void 543 __bs_wm_4(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 544 const u_int32_t *addr, bus_size_t count) 545 { 546 while (count--) 547 bus_space_write_4(t, bsh, offset, *addr++); 548 } 549 550 void 551 __bs_wr_1(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 552 const u_int8_t *addr, bus_size_t count) 553 { 554 while (count--) { 555 bus_space_write_1(t, bsh, offset, *addr++); 556 offset += sizeof(*addr); 557 } 558 } 559 560 void 561 __bs_wr_2(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 562 const u_int16_t *addr, bus_size_t count) 563 { 564 while (count--) { 565 bus_space_write_2(t, bsh, offset, *addr++); 566 offset += sizeof(*addr); 567 } 568 } 569 570 void 571 __bs_wr_4(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 572 const u_int32_t *addr, bus_size_t count) 573 { 574 while (count--) { 575 bus_space_write_4(t, bsh, offset, *addr++); 576 offset += sizeof(*addr); 577 } 578 } 579 580 void 581 __bs_sm_1(bus_space_tag_t t, bus_space_handle_t bsh, 582 bus_size_t offset, u_int8_t value, bus_size_t count) 583 { 584 while (count--) 585 bus_space_write_1(t, bsh, offset, value); 586 } 587 588 void 589 __bs_sm_2(bus_space_tag_t t, bus_space_handle_t bsh, 590 bus_size_t offset, u_int16_t value, bus_size_t count) 591 { 592 while (count--) 593 bus_space_write_2(t, bsh, offset, value); 594 } 595 596 void 597 __bs_sm_4(bus_space_tag_t t, bus_space_handle_t bsh, 598 bus_size_t offset, u_int32_t value, bus_size_t count) 599 { 600 while (count--) 601 bus_space_write_4(t, bsh, offset, value); 602 } 603 604 605 void 606 __bs_sr_1(bus_space_tag_t t, bus_space_handle_t bsh, 607 bus_size_t offset, u_int8_t value, bus_size_t count) 608 { 609 while (count--) { 610 bus_space_write_1(t, bsh, offset, value); 611 offset += (value); 612 } 613 } 614 615 void 616 __bs_sr_2(bus_space_tag_t t, bus_space_handle_t bsh, 617 bus_size_t offset, u_int16_t value, bus_size_t count) 618 { 619 while (count--) { 620 bus_space_write_2(t, bsh, offset, value); 621 offset += (value); 622 } 623 } 624 625 void 626 __bs_sr_4(bus_space_tag_t t, bus_space_handle_t bsh, 627 bus_size_t offset, u_int32_t value, bus_size_t count) 628 { 629 while (count--) { 630 bus_space_write_4(t, bsh, offset, value); 631 offset += (value); 632 } 633 } 634 635 #define __bs_c_n(n) \ 636 void __CONCAT(__bs_c_,n)(bus_space_tag_t t, bus_space_handle_t h1, \ 637 bus_size_t o1, bus_space_handle_t h2, bus_size_t o2, bus_size_t c) \ 638 { \ 639 bus_size_t o; \ 640 \ 641 if ((h1 + o1) >= (h2 + o2)) { \ 642 /* src after dest: copy forward */ \ 643 for (o = 0; c != 0; c--, o += n) \ 644 __CONCAT(bus_space_write_,n)(t, h2, o2 + o, \ 645 __CONCAT(bus_space_read_,n)(t, h1, o1 + o));\ 646 } else { \ 647 /* dest after src: copy backwards */ \ 648 for (o = (c - 1) * n; c != 0; c--, o -= n) \ 649 __CONCAT(bus_space_write_,n)(t, h2, o2 + o, \ 650 __CONCAT(bus_space_read_,n)(t, h1, o1 + o));\ 651 } \ 652 } 653 654 __bs_c_n(1) 655 __bs_c_n(2) 656 __bs_c_n(4) 657