1 /* $Id: ioport.c,v 1.45 2001/10/30 04:54:21 davem Exp $ 2 * ioport.c: Simple io mapping allocator. 3 * 4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 5 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx) 6 * 7 * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev. 8 * 9 * 2000/01/29 10 * <rth> zait: as long as pci_alloc_consistent produces something addressable, 11 * things are ok. 12 * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a 13 * pointer into the big page mapping 14 * <rth> zait: so what? 15 * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page())) 16 * <zaitcev> Hmm 17 * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())). 18 * So far so good. 19 * <zaitcev> Now, driver calls pci_free_consistent(with result of 20 * remap_it_my_way()). 21 * <zaitcev> How do you find the address to pass to free_pages()? 22 * <rth> zait: walk the page tables? It's only two or three level after all. 23 * <rth> zait: you have to walk them anyway to remove the mapping. 24 * <zaitcev> Hmm 25 * <zaitcev> Sounds reasonable 26 */ 27 28 #include <linux/config.h> 29 #include <linux/sched.h> 30 #include <linux/kernel.h> 31 #include <linux/errno.h> 32 #include <linux/types.h> 33 #include <linux/ioport.h> 34 #include <linux/mm.h> 35 #include <linux/slab.h> 36 #include <linux/pci.h> /* struct pci_dev */ 37 #include <linux/proc_fs.h> 38 39 #include <asm/io.h> 40 #include <asm/vaddrs.h> 41 #include <asm/oplib.h> 42 #include <asm/page.h> 43 #include <asm/pgalloc.h> 44 #include <asm/dma.h> 45 46 #define mmu_inval_dma_area(p, l) /* Anton pulled it out for 2.4.0-xx */ 47 48 struct resource *_sparc_find_resource(struct resource *r, unsigned long); 49 50 static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz); 51 static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys, 52 unsigned long size, char *name); 53 static void _sparc_free_io(struct resource *res); 54 55 /* This points to the next to use virtual memory for DVMA mappings */ 56 static struct resource _sparc_dvma = { 57 .name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1 58 }; 59 /* This points to the start of I/O mappings, cluable from outside. */ 60 /*ext*/ struct resource sparc_iomap = { 61 .name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1 62 }; 63 64 /* 65 * Our mini-allocator... 66 * Boy this is gross! We need it because we must map I/O for 67 * timers and interrupt controller before the kmalloc is available. 68 */ 69 70 #define XNMLN 15 71 #define XNRES 10 /* SS-10 uses 8 */ 72 73 struct xresource { 74 struct resource xres; /* Must be first */ 75 int xflag; /* 1 == used */ 76 char xname[XNMLN+1]; 77 }; 78 79 static struct xresource xresv[XNRES]; 80 81 static struct xresource *xres_alloc(void) { 82 struct xresource *xrp; 83 int n; 84 85 xrp = xresv; 86 for (n = 0; n < XNRES; n++) { 87 if (xrp->xflag == 0) { 88 xrp->xflag = 1; 89 return xrp; 90 } 91 xrp++; 92 } 93 return NULL; 94 } 95 96 static void xres_free(struct xresource *xrp) { 97 xrp->xflag = 0; 98 } 99 100 /* 101 * These are typically used in PCI drivers 102 * which are trying to be cross-platform. 103 * 104 * Bus type is always zero on IIep. 105 */ 106 void __iomem *ioremap(unsigned long offset, unsigned long size) 107 { 108 char name[14]; 109 110 sprintf(name, "phys_%08x", (u32)offset); 111 return _sparc_alloc_io(0, offset, size, name); 112 } 113 114 /* 115 * Comlimentary to ioremap(). 116 */ 117 void iounmap(volatile void __iomem *virtual) 118 { 119 unsigned long vaddr = (unsigned long) virtual & PAGE_MASK; 120 struct resource *res; 121 122 if ((res = _sparc_find_resource(&sparc_iomap, vaddr)) == NULL) { 123 printk("free_io/iounmap: cannot free %lx\n", vaddr); 124 return; 125 } 126 _sparc_free_io(res); 127 128 if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) { 129 xres_free((struct xresource *)res); 130 } else { 131 kfree(res); 132 } 133 } 134 135 /* 136 */ 137 void __iomem *sbus_ioremap(struct resource *phyres, unsigned long offset, 138 unsigned long size, char *name) 139 { 140 return _sparc_alloc_io(phyres->flags & 0xF, 141 phyres->start + offset, size, name); 142 } 143 144 /* 145 */ 146 void sbus_iounmap(volatile void __iomem *addr, unsigned long size) 147 { 148 iounmap(addr); 149 } 150 151 /* 152 * Meat of mapping 153 */ 154 static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys, 155 unsigned long size, char *name) 156 { 157 static int printed_full; 158 struct xresource *xres; 159 struct resource *res; 160 char *tack; 161 int tlen; 162 void __iomem *va; /* P3 diag */ 163 164 if (name == NULL) name = "???"; 165 166 if ((xres = xres_alloc()) != 0) { 167 tack = xres->xname; 168 res = &xres->xres; 169 } else { 170 if (!printed_full) { 171 printk("ioremap: done with statics, switching to malloc\n"); 172 printed_full = 1; 173 } 174 tlen = strlen(name); 175 tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL); 176 if (tack == NULL) return NULL; 177 memset(tack, 0, sizeof(struct resource)); 178 res = (struct resource *) tack; 179 tack += sizeof (struct resource); 180 } 181 182 strlcpy(tack, name, XNMLN+1); 183 res->name = tack; 184 185 va = _sparc_ioremap(res, busno, phys, size); 186 /* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */ 187 return va; 188 } 189 190 /* 191 */ 192 static void __iomem * 193 _sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz) 194 { 195 unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK); 196 197 if (allocate_resource(&sparc_iomap, res, 198 (offset + sz + PAGE_SIZE-1) & PAGE_MASK, 199 sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) { 200 /* Usually we cannot see printks in this case. */ 201 prom_printf("alloc_io_res(%s): cannot occupy\n", 202 (res->name != NULL)? res->name: "???"); 203 prom_halt(); 204 } 205 206 pa &= PAGE_MASK; 207 sparc_mapiorange(bus, pa, res->start, res->end - res->start + 1); 208 209 return (void __iomem *) (res->start + offset); 210 } 211 212 /* 213 * Comlimentary to _sparc_ioremap(). 214 */ 215 static void _sparc_free_io(struct resource *res) 216 { 217 unsigned long plen; 218 219 plen = res->end - res->start + 1; 220 BUG_ON((plen & (PAGE_SIZE-1)) != 0); 221 sparc_unmapiorange(res->start, plen); 222 release_resource(res); 223 } 224 225 #ifdef CONFIG_SBUS 226 227 void sbus_set_sbus64(struct sbus_dev *sdev, int x) { 228 printk("sbus_set_sbus64: unsupported\n"); 229 } 230 231 /* 232 * Allocate a chunk of memory suitable for DMA. 233 * Typically devices use them for control blocks. 234 * CPU may access them without any explicit flushing. 235 * 236 * XXX Some clever people know that sdev is not used and supply NULL. Watch. 237 */ 238 void *sbus_alloc_consistent(struct sbus_dev *sdev, long len, u32 *dma_addrp) 239 { 240 unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK; 241 unsigned long va; 242 struct resource *res; 243 int order; 244 245 /* XXX why are some lenghts signed, others unsigned? */ 246 if (len <= 0) { 247 return NULL; 248 } 249 /* XXX So what is maxphys for us and how do drivers know it? */ 250 if (len > 256*1024) { /* __get_free_pages() limit */ 251 return NULL; 252 } 253 254 order = get_order(len_total); 255 if ((va = __get_free_pages(GFP_KERNEL|__GFP_COMP, order)) == 0) 256 goto err_nopages; 257 258 if ((res = kmalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) 259 goto err_nomem; 260 memset((char*)res, 0, sizeof(struct resource)); 261 262 if (allocate_resource(&_sparc_dvma, res, len_total, 263 _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) { 264 printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total); 265 goto err_nova; 266 } 267 mmu_inval_dma_area(va, len_total); 268 // XXX The mmu_map_dma_area does this for us below, see comments. 269 // sparc_mapiorange(0, virt_to_phys(va), res->start, len_total); 270 /* 271 * XXX That's where sdev would be used. Currently we load 272 * all iommu tables with the same translations. 273 */ 274 if (mmu_map_dma_area(dma_addrp, va, res->start, len_total) != 0) 275 goto err_noiommu; 276 277 /* Set the resource name, if known. */ 278 if (sdev) { 279 res->name = sdev->prom_name; 280 } 281 282 return (void *)res->start; 283 284 err_noiommu: 285 release_resource(res); 286 err_nova: 287 free_pages(va, order); 288 err_nomem: 289 kfree(res); 290 err_nopages: 291 return NULL; 292 } 293 294 void sbus_free_consistent(struct sbus_dev *sdev, long n, void *p, u32 ba) 295 { 296 struct resource *res; 297 struct page *pgv; 298 299 if ((res = _sparc_find_resource(&_sparc_dvma, 300 (unsigned long)p)) == NULL) { 301 printk("sbus_free_consistent: cannot free %p\n", p); 302 return; 303 } 304 305 if (((unsigned long)p & (PAGE_SIZE-1)) != 0) { 306 printk("sbus_free_consistent: unaligned va %p\n", p); 307 return; 308 } 309 310 n = (n + PAGE_SIZE-1) & PAGE_MASK; 311 if ((res->end-res->start)+1 != n) { 312 printk("sbus_free_consistent: region 0x%lx asked 0x%lx\n", 313 (long)((res->end-res->start)+1), n); 314 return; 315 } 316 317 release_resource(res); 318 kfree(res); 319 320 /* mmu_inval_dma_area(va, n); */ /* it's consistent, isn't it */ 321 pgv = mmu_translate_dvma(ba); 322 mmu_unmap_dma_area(ba, n); 323 324 __free_pages(pgv, get_order(n)); 325 } 326 327 /* 328 * Map a chunk of memory so that devices can see it. 329 * CPU view of this memory may be inconsistent with 330 * a device view and explicit flushing is necessary. 331 */ 332 dma_addr_t sbus_map_single(struct sbus_dev *sdev, void *va, size_t len, int direction) 333 { 334 /* XXX why are some lenghts signed, others unsigned? */ 335 if (len <= 0) { 336 return 0; 337 } 338 /* XXX So what is maxphys for us and how do drivers know it? */ 339 if (len > 256*1024) { /* __get_free_pages() limit */ 340 return 0; 341 } 342 return mmu_get_scsi_one(va, len, sdev->bus); 343 } 344 345 void sbus_unmap_single(struct sbus_dev *sdev, dma_addr_t ba, size_t n, int direction) 346 { 347 mmu_release_scsi_one(ba, n, sdev->bus); 348 } 349 350 int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction) 351 { 352 mmu_get_scsi_sgl(sg, n, sdev->bus); 353 354 /* 355 * XXX sparc64 can return a partial length here. sun4c should do this 356 * but it currently panics if it can't fulfill the request - Anton 357 */ 358 return n; 359 } 360 361 void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction) 362 { 363 mmu_release_scsi_sgl(sg, n, sdev->bus); 364 } 365 366 /* 367 */ 368 void sbus_dma_sync_single_for_cpu(struct sbus_dev *sdev, dma_addr_t ba, size_t size, int direction) 369 { 370 #if 0 371 unsigned long va; 372 struct resource *res; 373 374 /* We do not need the resource, just print a message if invalid. */ 375 res = _sparc_find_resource(&_sparc_dvma, ba); 376 if (res == NULL) 377 panic("sbus_dma_sync_single: 0x%x\n", ba); 378 379 va = page_address(mmu_translate_dvma(ba)); /* XXX higmem */ 380 /* 381 * XXX This bogosity will be fixed with the iommu rewrite coming soon 382 * to a kernel near you. - Anton 383 */ 384 /* mmu_inval_dma_area(va, (size + PAGE_SIZE-1) & PAGE_MASK); */ 385 #endif 386 } 387 388 void sbus_dma_sync_single_for_device(struct sbus_dev *sdev, dma_addr_t ba, size_t size, int direction) 389 { 390 #if 0 391 unsigned long va; 392 struct resource *res; 393 394 /* We do not need the resource, just print a message if invalid. */ 395 res = _sparc_find_resource(&_sparc_dvma, ba); 396 if (res == NULL) 397 panic("sbus_dma_sync_single: 0x%x\n", ba); 398 399 va = page_address(mmu_translate_dvma(ba)); /* XXX higmem */ 400 /* 401 * XXX This bogosity will be fixed with the iommu rewrite coming soon 402 * to a kernel near you. - Anton 403 */ 404 /* mmu_inval_dma_area(va, (size + PAGE_SIZE-1) & PAGE_MASK); */ 405 #endif 406 } 407 408 void sbus_dma_sync_sg_for_cpu(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction) 409 { 410 printk("sbus_dma_sync_sg_for_cpu: not implemented yet\n"); 411 } 412 413 void sbus_dma_sync_sg_for_device(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction) 414 { 415 printk("sbus_dma_sync_sg_for_device: not implemented yet\n"); 416 } 417 #endif /* CONFIG_SBUS */ 418 419 #ifdef CONFIG_PCI 420 421 /* Allocate and map kernel buffer using consistent mode DMA for a device. 422 * hwdev should be valid struct pci_dev pointer for PCI devices. 423 */ 424 void *pci_alloc_consistent(struct pci_dev *pdev, size_t len, dma_addr_t *pba) 425 { 426 unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK; 427 unsigned long va; 428 struct resource *res; 429 int order; 430 431 if (len == 0) { 432 return NULL; 433 } 434 if (len > 256*1024) { /* __get_free_pages() limit */ 435 return NULL; 436 } 437 438 order = get_order(len_total); 439 va = __get_free_pages(GFP_KERNEL, order); 440 if (va == 0) { 441 printk("pci_alloc_consistent: no %ld pages\n", len_total>>PAGE_SHIFT); 442 return NULL; 443 } 444 445 if ((res = kmalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) { 446 free_pages(va, order); 447 printk("pci_alloc_consistent: no core\n"); 448 return NULL; 449 } 450 memset((char*)res, 0, sizeof(struct resource)); 451 452 if (allocate_resource(&_sparc_dvma, res, len_total, 453 _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) { 454 printk("pci_alloc_consistent: cannot occupy 0x%lx", len_total); 455 free_pages(va, order); 456 kfree(res); 457 return NULL; 458 } 459 mmu_inval_dma_area(va, len_total); 460 #if 0 461 /* P3 */ printk("pci_alloc_consistent: kva %lx uncva %lx phys %lx size %lx\n", 462 (long)va, (long)res->start, (long)virt_to_phys(va), len_total); 463 #endif 464 sparc_mapiorange(0, virt_to_phys(va), res->start, len_total); 465 466 *pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */ 467 return (void *) res->start; 468 } 469 470 /* Free and unmap a consistent DMA buffer. 471 * cpu_addr is what was returned from pci_alloc_consistent, 472 * size must be the same as what as passed into pci_alloc_consistent, 473 * and likewise dma_addr must be the same as what *dma_addrp was set to. 474 * 475 * References to the memory and mappings assosciated with cpu_addr/dma_addr 476 * past this call are illegal. 477 */ 478 void pci_free_consistent(struct pci_dev *pdev, size_t n, void *p, dma_addr_t ba) 479 { 480 struct resource *res; 481 unsigned long pgp; 482 483 if ((res = _sparc_find_resource(&_sparc_dvma, 484 (unsigned long)p)) == NULL) { 485 printk("pci_free_consistent: cannot free %p\n", p); 486 return; 487 } 488 489 if (((unsigned long)p & (PAGE_SIZE-1)) != 0) { 490 printk("pci_free_consistent: unaligned va %p\n", p); 491 return; 492 } 493 494 n = (n + PAGE_SIZE-1) & PAGE_MASK; 495 if ((res->end-res->start)+1 != n) { 496 printk("pci_free_consistent: region 0x%lx asked 0x%lx\n", 497 (long)((res->end-res->start)+1), (long)n); 498 return; 499 } 500 501 pgp = (unsigned long) phys_to_virt(ba); /* bus_to_virt actually */ 502 mmu_inval_dma_area(pgp, n); 503 sparc_unmapiorange((unsigned long)p, n); 504 505 release_resource(res); 506 kfree(res); 507 508 free_pages(pgp, get_order(n)); 509 } 510 511 /* Map a single buffer of the indicated size for DMA in streaming mode. 512 * The 32-bit bus address to use is returned. 513 * 514 * Once the device is given the dma address, the device owns this memory 515 * until either pci_unmap_single or pci_dma_sync_single_* is performed. 516 */ 517 dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, 518 int direction) 519 { 520 BUG_ON(direction == PCI_DMA_NONE); 521 /* IIep is write-through, not flushing. */ 522 return virt_to_phys(ptr); 523 } 524 525 /* Unmap a single streaming mode DMA translation. The dma_addr and size 526 * must match what was provided for in a previous pci_map_single call. All 527 * other usages are undefined. 528 * 529 * After this call, reads by the cpu to the buffer are guaranteed to see 530 * whatever the device wrote there. 531 */ 532 void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t ba, size_t size, 533 int direction) 534 { 535 BUG_ON(direction == PCI_DMA_NONE); 536 if (direction != PCI_DMA_TODEVICE) { 537 mmu_inval_dma_area((unsigned long)phys_to_virt(ba), 538 (size + PAGE_SIZE-1) & PAGE_MASK); 539 } 540 } 541 542 /* 543 * Same as pci_map_single, but with pages. 544 */ 545 dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page, 546 unsigned long offset, size_t size, int direction) 547 { 548 BUG_ON(direction == PCI_DMA_NONE); 549 /* IIep is write-through, not flushing. */ 550 return page_to_phys(page) + offset; 551 } 552 553 void pci_unmap_page(struct pci_dev *hwdev, 554 dma_addr_t dma_address, size_t size, int direction) 555 { 556 BUG_ON(direction == PCI_DMA_NONE); 557 /* mmu_inval_dma_area XXX */ 558 } 559 560 /* Map a set of buffers described by scatterlist in streaming 561 * mode for DMA. This is the scather-gather version of the 562 * above pci_map_single interface. Here the scatter gather list 563 * elements are each tagged with the appropriate dma address 564 * and length. They are obtained via sg_dma_{address,length}(SG). 565 * 566 * NOTE: An implementation may be able to use a smaller number of 567 * DMA address/length pairs than there are SG table elements. 568 * (for example via virtual mapping capabilities) 569 * The routine returns the number of addr/length pairs actually 570 * used, at most nents. 571 * 572 * Device ownership issues as mentioned above for pci_map_single are 573 * the same here. 574 */ 575 int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, 576 int direction) 577 { 578 int n; 579 580 BUG_ON(direction == PCI_DMA_NONE); 581 /* IIep is write-through, not flushing. */ 582 for (n = 0; n < nents; n++) { 583 BUG_ON(page_address(sg->page) == NULL); 584 sg->dvma_address = virt_to_phys(page_address(sg->page)); 585 sg->dvma_length = sg->length; 586 sg++; 587 } 588 return nents; 589 } 590 591 /* Unmap a set of streaming mode DMA translations. 592 * Again, cpu read rules concerning calls here are the same as for 593 * pci_unmap_single() above. 594 */ 595 void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, 596 int direction) 597 { 598 int n; 599 600 BUG_ON(direction == PCI_DMA_NONE); 601 if (direction != PCI_DMA_TODEVICE) { 602 for (n = 0; n < nents; n++) { 603 BUG_ON(page_address(sg->page) == NULL); 604 mmu_inval_dma_area( 605 (unsigned long) page_address(sg->page), 606 (sg->length + PAGE_SIZE-1) & PAGE_MASK); 607 sg++; 608 } 609 } 610 } 611 612 /* Make physical memory consistent for a single 613 * streaming mode DMA translation before or after a transfer. 614 * 615 * If you perform a pci_map_single() but wish to interrogate the 616 * buffer using the cpu, yet do not wish to teardown the PCI dma 617 * mapping, you must call this function before doing so. At the 618 * next point you give the PCI dma address back to the card, you 619 * must first perform a pci_dma_sync_for_device, and then the 620 * device again owns the buffer. 621 */ 622 void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction) 623 { 624 BUG_ON(direction == PCI_DMA_NONE); 625 if (direction != PCI_DMA_TODEVICE) { 626 mmu_inval_dma_area((unsigned long)phys_to_virt(ba), 627 (size + PAGE_SIZE-1) & PAGE_MASK); 628 } 629 } 630 631 void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction) 632 { 633 BUG_ON(direction == PCI_DMA_NONE); 634 if (direction != PCI_DMA_TODEVICE) { 635 mmu_inval_dma_area((unsigned long)phys_to_virt(ba), 636 (size + PAGE_SIZE-1) & PAGE_MASK); 637 } 638 } 639 640 /* Make physical memory consistent for a set of streaming 641 * mode DMA translations after a transfer. 642 * 643 * The same as pci_dma_sync_single_* but for a scatter-gather list, 644 * same rules and usage. 645 */ 646 void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction) 647 { 648 int n; 649 650 BUG_ON(direction == PCI_DMA_NONE); 651 if (direction != PCI_DMA_TODEVICE) { 652 for (n = 0; n < nents; n++) { 653 BUG_ON(page_address(sg->page) == NULL); 654 mmu_inval_dma_area( 655 (unsigned long) page_address(sg->page), 656 (sg->length + PAGE_SIZE-1) & PAGE_MASK); 657 sg++; 658 } 659 } 660 } 661 662 void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction) 663 { 664 int n; 665 666 BUG_ON(direction == PCI_DMA_NONE); 667 if (direction != PCI_DMA_TODEVICE) { 668 for (n = 0; n < nents; n++) { 669 BUG_ON(page_address(sg->page) == NULL); 670 mmu_inval_dma_area( 671 (unsigned long) page_address(sg->page), 672 (sg->length + PAGE_SIZE-1) & PAGE_MASK); 673 sg++; 674 } 675 } 676 } 677 #endif /* CONFIG_PCI */ 678 679 #ifdef CONFIG_PROC_FS 680 681 static int 682 _sparc_io_get_info(char *buf, char **start, off_t fpos, int length, int *eof, 683 void *data) 684 { 685 char *p = buf, *e = buf + length; 686 struct resource *r; 687 const char *nm; 688 689 for (r = ((struct resource *)data)->child; r != NULL; r = r->sibling) { 690 if (p + 32 >= e) /* Better than nothing */ 691 break; 692 if ((nm = r->name) == 0) nm = "???"; 693 p += sprintf(p, "%08lx-%08lx: %s\n", r->start, r->end, nm); 694 } 695 696 return p-buf; 697 } 698 699 #endif /* CONFIG_PROC_FS */ 700 701 /* 702 * This is a version of find_resource and it belongs to kernel/resource.c. 703 * Until we have agreement with Linus and Martin, it lingers here. 704 * 705 * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case. 706 * This probably warrants some sort of hashing. 707 */ 708 struct resource * 709 _sparc_find_resource(struct resource *root, unsigned long hit) 710 { 711 struct resource *tmp; 712 713 for (tmp = root->child; tmp != 0; tmp = tmp->sibling) { 714 if (tmp->start <= hit && tmp->end >= hit) 715 return tmp; 716 } 717 return NULL; 718 } 719 720 void register_proc_sparc_ioport(void) 721 { 722 #ifdef CONFIG_PROC_FS 723 create_proc_read_entry("io_map",0,NULL,_sparc_io_get_info,&sparc_iomap); 724 create_proc_read_entry("dvma_map",0,NULL,_sparc_io_get_info,&_sparc_dvma); 725 #endif 726 } 727