1 /* 2 * Contains common pci routines for ALL ppc platform 3 * (based on pci_32.c and pci_64.c) 4 * 5 * Port for PPC64 David Engebretsen, IBM Corp. 6 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands. 7 * 8 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM 9 * Rework, based on alpha PCI code. 10 * 11 * Common pmac/prep/chrp pci routines. -- Cort 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License 15 * as published by the Free Software Foundation; either version 16 * 2 of the License, or (at your option) any later version. 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/pci.h> 21 #include <linux/string.h> 22 #include <linux/init.h> 23 #include <linux/delay.h> 24 #include <linux/export.h> 25 #include <linux/of_address.h> 26 #include <linux/of_pci.h> 27 #include <linux/mm.h> 28 #include <linux/list.h> 29 #include <linux/syscalls.h> 30 #include <linux/irq.h> 31 #include <linux/vmalloc.h> 32 #include <linux/slab.h> 33 #include <linux/vgaarb.h> 34 35 #include <asm/processor.h> 36 #include <asm/io.h> 37 #include <asm/prom.h> 38 #include <asm/pci-bridge.h> 39 #include <asm/byteorder.h> 40 #include <asm/machdep.h> 41 #include <asm/ppc-pci.h> 42 #include <asm/eeh.h> 43 44 static DEFINE_SPINLOCK(hose_spinlock); 45 LIST_HEAD(hose_list); 46 47 /* XXX kill that some day ... */ 48 static int global_phb_number; /* Global phb counter */ 49 50 /* ISA Memory physical address */ 51 resource_size_t isa_mem_base; 52 53 54 static struct dma_map_ops *pci_dma_ops = &dma_direct_ops; 55 56 void set_pci_dma_ops(struct dma_map_ops *dma_ops) 57 { 58 pci_dma_ops = dma_ops; 59 } 60 61 struct dma_map_ops *get_pci_dma_ops(void) 62 { 63 return pci_dma_ops; 64 } 65 EXPORT_SYMBOL(get_pci_dma_ops); 66 67 struct pci_controller *pcibios_alloc_controller(struct device_node *dev) 68 { 69 struct pci_controller *phb; 70 71 phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL); 72 if (phb == NULL) 73 return NULL; 74 spin_lock(&hose_spinlock); 75 phb->global_number = global_phb_number++; 76 list_add_tail(&phb->list_node, &hose_list); 77 spin_unlock(&hose_spinlock); 78 phb->dn = dev; 79 phb->is_dynamic = slab_is_available(); 80 #ifdef CONFIG_PPC64 81 if (dev) { 82 int nid = of_node_to_nid(dev); 83 84 if (nid < 0 || !node_online(nid)) 85 nid = -1; 86 87 PHB_SET_NODE(phb, nid); 88 } 89 #endif 90 return phb; 91 } 92 EXPORT_SYMBOL_GPL(pcibios_alloc_controller); 93 94 void pcibios_free_controller(struct pci_controller *phb) 95 { 96 spin_lock(&hose_spinlock); 97 list_del(&phb->list_node); 98 spin_unlock(&hose_spinlock); 99 100 if (phb->is_dynamic) 101 kfree(phb); 102 } 103 EXPORT_SYMBOL_GPL(pcibios_free_controller); 104 105 /* 106 * The function is used to return the minimal alignment 107 * for memory or I/O windows of the associated P2P bridge. 108 * By default, 4KiB alignment for I/O windows and 1MiB for 109 * memory windows. 110 */ 111 resource_size_t pcibios_window_alignment(struct pci_bus *bus, 112 unsigned long type) 113 { 114 struct pci_controller *phb = pci_bus_to_host(bus); 115 116 if (phb->controller_ops.window_alignment) 117 return phb->controller_ops.window_alignment(bus, type); 118 119 /* 120 * PCI core will figure out the default 121 * alignment: 4KiB for I/O and 1MiB for 122 * memory window. 123 */ 124 return 1; 125 } 126 127 void pcibios_reset_secondary_bus(struct pci_dev *dev) 128 { 129 struct pci_controller *phb = pci_bus_to_host(dev->bus); 130 131 if (phb->controller_ops.reset_secondary_bus) { 132 phb->controller_ops.reset_secondary_bus(dev); 133 return; 134 } 135 136 pci_reset_secondary_bus(dev); 137 } 138 139 #ifdef CONFIG_PCI_IOV 140 resource_size_t pcibios_iov_resource_alignment(struct pci_dev *pdev, int resno) 141 { 142 if (ppc_md.pcibios_iov_resource_alignment) 143 return ppc_md.pcibios_iov_resource_alignment(pdev, resno); 144 145 return pci_iov_resource_size(pdev, resno); 146 } 147 #endif /* CONFIG_PCI_IOV */ 148 149 static resource_size_t pcibios_io_size(const struct pci_controller *hose) 150 { 151 #ifdef CONFIG_PPC64 152 return hose->pci_io_size; 153 #else 154 return resource_size(&hose->io_resource); 155 #endif 156 } 157 158 int pcibios_vaddr_is_ioport(void __iomem *address) 159 { 160 int ret = 0; 161 struct pci_controller *hose; 162 resource_size_t size; 163 164 spin_lock(&hose_spinlock); 165 list_for_each_entry(hose, &hose_list, list_node) { 166 size = pcibios_io_size(hose); 167 if (address >= hose->io_base_virt && 168 address < (hose->io_base_virt + size)) { 169 ret = 1; 170 break; 171 } 172 } 173 spin_unlock(&hose_spinlock); 174 return ret; 175 } 176 177 unsigned long pci_address_to_pio(phys_addr_t address) 178 { 179 struct pci_controller *hose; 180 resource_size_t size; 181 unsigned long ret = ~0; 182 183 spin_lock(&hose_spinlock); 184 list_for_each_entry(hose, &hose_list, list_node) { 185 size = pcibios_io_size(hose); 186 if (address >= hose->io_base_phys && 187 address < (hose->io_base_phys + size)) { 188 unsigned long base = 189 (unsigned long)hose->io_base_virt - _IO_BASE; 190 ret = base + (address - hose->io_base_phys); 191 break; 192 } 193 } 194 spin_unlock(&hose_spinlock); 195 196 return ret; 197 } 198 EXPORT_SYMBOL_GPL(pci_address_to_pio); 199 200 /* 201 * Return the domain number for this bus. 202 */ 203 int pci_domain_nr(struct pci_bus *bus) 204 { 205 struct pci_controller *hose = pci_bus_to_host(bus); 206 207 return hose->global_number; 208 } 209 EXPORT_SYMBOL(pci_domain_nr); 210 211 /* This routine is meant to be used early during boot, when the 212 * PCI bus numbers have not yet been assigned, and you need to 213 * issue PCI config cycles to an OF device. 214 * It could also be used to "fix" RTAS config cycles if you want 215 * to set pci_assign_all_buses to 1 and still use RTAS for PCI 216 * config cycles. 217 */ 218 struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node) 219 { 220 while(node) { 221 struct pci_controller *hose, *tmp; 222 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 223 if (hose->dn == node) 224 return hose; 225 node = node->parent; 226 } 227 return NULL; 228 } 229 230 /* 231 * Reads the interrupt pin to determine if interrupt is use by card. 232 * If the interrupt is used, then gets the interrupt line from the 233 * openfirmware and sets it in the pci_dev and pci_config line. 234 */ 235 static int pci_read_irq_line(struct pci_dev *pci_dev) 236 { 237 struct of_phandle_args oirq; 238 unsigned int virq; 239 240 pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev)); 241 242 #ifdef DEBUG 243 memset(&oirq, 0xff, sizeof(oirq)); 244 #endif 245 /* Try to get a mapping from the device-tree */ 246 if (of_irq_parse_pci(pci_dev, &oirq)) { 247 u8 line, pin; 248 249 /* If that fails, lets fallback to what is in the config 250 * space and map that through the default controller. We 251 * also set the type to level low since that's what PCI 252 * interrupts are. If your platform does differently, then 253 * either provide a proper interrupt tree or don't use this 254 * function. 255 */ 256 if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin)) 257 return -1; 258 if (pin == 0) 259 return -1; 260 if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) || 261 line == 0xff || line == 0) { 262 return -1; 263 } 264 pr_debug(" No map ! Using line %d (pin %d) from PCI config\n", 265 line, pin); 266 267 virq = irq_create_mapping(NULL, line); 268 if (virq != NO_IRQ) 269 irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW); 270 } else { 271 pr_debug(" Got one, spec %d cells (0x%08x 0x%08x...) on %s\n", 272 oirq.args_count, oirq.args[0], oirq.args[1], 273 of_node_full_name(oirq.np)); 274 275 virq = irq_create_of_mapping(&oirq); 276 } 277 if(virq == NO_IRQ) { 278 pr_debug(" Failed to map !\n"); 279 return -1; 280 } 281 282 pr_debug(" Mapped to linux irq %d\n", virq); 283 284 pci_dev->irq = virq; 285 286 return 0; 287 } 288 289 /* 290 * Platform support for /proc/bus/pci/X/Y mmap()s, 291 * modelled on the sparc64 implementation by Dave Miller. 292 * -- paulus. 293 */ 294 295 /* 296 * Adjust vm_pgoff of VMA such that it is the physical page offset 297 * corresponding to the 32-bit pci bus offset for DEV requested by the user. 298 * 299 * Basically, the user finds the base address for his device which he wishes 300 * to mmap. They read the 32-bit value from the config space base register, 301 * add whatever PAGE_SIZE multiple offset they wish, and feed this into the 302 * offset parameter of mmap on /proc/bus/pci/XXX for that device. 303 * 304 * Returns negative error code on failure, zero on success. 305 */ 306 static struct resource *__pci_mmap_make_offset(struct pci_dev *dev, 307 resource_size_t *offset, 308 enum pci_mmap_state mmap_state) 309 { 310 struct pci_controller *hose = pci_bus_to_host(dev->bus); 311 unsigned long io_offset = 0; 312 int i, res_bit; 313 314 if (hose == NULL) 315 return NULL; /* should never happen */ 316 317 /* If memory, add on the PCI bridge address offset */ 318 if (mmap_state == pci_mmap_mem) { 319 #if 0 /* See comment in pci_resource_to_user() for why this is disabled */ 320 *offset += hose->pci_mem_offset; 321 #endif 322 res_bit = IORESOURCE_MEM; 323 } else { 324 io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; 325 *offset += io_offset; 326 res_bit = IORESOURCE_IO; 327 } 328 329 /* 330 * Check that the offset requested corresponds to one of the 331 * resources of the device. 332 */ 333 for (i = 0; i <= PCI_ROM_RESOURCE; i++) { 334 struct resource *rp = &dev->resource[i]; 335 int flags = rp->flags; 336 337 /* treat ROM as memory (should be already) */ 338 if (i == PCI_ROM_RESOURCE) 339 flags |= IORESOURCE_MEM; 340 341 /* Active and same type? */ 342 if ((flags & res_bit) == 0) 343 continue; 344 345 /* In the range of this resource? */ 346 if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end) 347 continue; 348 349 /* found it! construct the final physical address */ 350 if (mmap_state == pci_mmap_io) 351 *offset += hose->io_base_phys - io_offset; 352 return rp; 353 } 354 355 return NULL; 356 } 357 358 /* 359 * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci 360 * device mapping. 361 */ 362 static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp, 363 pgprot_t protection, 364 enum pci_mmap_state mmap_state, 365 int write_combine) 366 { 367 368 /* Write combine is always 0 on non-memory space mappings. On 369 * memory space, if the user didn't pass 1, we check for a 370 * "prefetchable" resource. This is a bit hackish, but we use 371 * this to workaround the inability of /sysfs to provide a write 372 * combine bit 373 */ 374 if (mmap_state != pci_mmap_mem) 375 write_combine = 0; 376 else if (write_combine == 0) { 377 if (rp->flags & IORESOURCE_PREFETCH) 378 write_combine = 1; 379 } 380 381 /* XXX would be nice to have a way to ask for write-through */ 382 if (write_combine) 383 return pgprot_noncached_wc(protection); 384 else 385 return pgprot_noncached(protection); 386 } 387 388 /* 389 * This one is used by /dev/mem and fbdev who have no clue about the 390 * PCI device, it tries to find the PCI device first and calls the 391 * above routine 392 */ 393 pgprot_t pci_phys_mem_access_prot(struct file *file, 394 unsigned long pfn, 395 unsigned long size, 396 pgprot_t prot) 397 { 398 struct pci_dev *pdev = NULL; 399 struct resource *found = NULL; 400 resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT; 401 int i; 402 403 if (page_is_ram(pfn)) 404 return prot; 405 406 prot = pgprot_noncached(prot); 407 for_each_pci_dev(pdev) { 408 for (i = 0; i <= PCI_ROM_RESOURCE; i++) { 409 struct resource *rp = &pdev->resource[i]; 410 int flags = rp->flags; 411 412 /* Active and same type? */ 413 if ((flags & IORESOURCE_MEM) == 0) 414 continue; 415 /* In the range of this resource? */ 416 if (offset < (rp->start & PAGE_MASK) || 417 offset > rp->end) 418 continue; 419 found = rp; 420 break; 421 } 422 if (found) 423 break; 424 } 425 if (found) { 426 if (found->flags & IORESOURCE_PREFETCH) 427 prot = pgprot_noncached_wc(prot); 428 pci_dev_put(pdev); 429 } 430 431 pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n", 432 (unsigned long long)offset, pgprot_val(prot)); 433 434 return prot; 435 } 436 437 438 /* 439 * Perform the actual remap of the pages for a PCI device mapping, as 440 * appropriate for this architecture. The region in the process to map 441 * is described by vm_start and vm_end members of VMA, the base physical 442 * address is found in vm_pgoff. 443 * The pci device structure is provided so that architectures may make mapping 444 * decisions on a per-device or per-bus basis. 445 * 446 * Returns a negative error code on failure, zero on success. 447 */ 448 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, 449 enum pci_mmap_state mmap_state, int write_combine) 450 { 451 resource_size_t offset = 452 ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; 453 struct resource *rp; 454 int ret; 455 456 rp = __pci_mmap_make_offset(dev, &offset, mmap_state); 457 if (rp == NULL) 458 return -EINVAL; 459 460 vma->vm_pgoff = offset >> PAGE_SHIFT; 461 vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp, 462 vma->vm_page_prot, 463 mmap_state, write_combine); 464 465 ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 466 vma->vm_end - vma->vm_start, vma->vm_page_prot); 467 468 return ret; 469 } 470 471 /* This provides legacy IO read access on a bus */ 472 int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size) 473 { 474 unsigned long offset; 475 struct pci_controller *hose = pci_bus_to_host(bus); 476 struct resource *rp = &hose->io_resource; 477 void __iomem *addr; 478 479 /* Check if port can be supported by that bus. We only check 480 * the ranges of the PHB though, not the bus itself as the rules 481 * for forwarding legacy cycles down bridges are not our problem 482 * here. So if the host bridge supports it, we do it. 483 */ 484 offset = (unsigned long)hose->io_base_virt - _IO_BASE; 485 offset += port; 486 487 if (!(rp->flags & IORESOURCE_IO)) 488 return -ENXIO; 489 if (offset < rp->start || (offset + size) > rp->end) 490 return -ENXIO; 491 addr = hose->io_base_virt + port; 492 493 switch(size) { 494 case 1: 495 *((u8 *)val) = in_8(addr); 496 return 1; 497 case 2: 498 if (port & 1) 499 return -EINVAL; 500 *((u16 *)val) = in_le16(addr); 501 return 2; 502 case 4: 503 if (port & 3) 504 return -EINVAL; 505 *((u32 *)val) = in_le32(addr); 506 return 4; 507 } 508 return -EINVAL; 509 } 510 511 /* This provides legacy IO write access on a bus */ 512 int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size) 513 { 514 unsigned long offset; 515 struct pci_controller *hose = pci_bus_to_host(bus); 516 struct resource *rp = &hose->io_resource; 517 void __iomem *addr; 518 519 /* Check if port can be supported by that bus. We only check 520 * the ranges of the PHB though, not the bus itself as the rules 521 * for forwarding legacy cycles down bridges are not our problem 522 * here. So if the host bridge supports it, we do it. 523 */ 524 offset = (unsigned long)hose->io_base_virt - _IO_BASE; 525 offset += port; 526 527 if (!(rp->flags & IORESOURCE_IO)) 528 return -ENXIO; 529 if (offset < rp->start || (offset + size) > rp->end) 530 return -ENXIO; 531 addr = hose->io_base_virt + port; 532 533 /* WARNING: The generic code is idiotic. It gets passed a pointer 534 * to what can be a 1, 2 or 4 byte quantity and always reads that 535 * as a u32, which means that we have to correct the location of 536 * the data read within those 32 bits for size 1 and 2 537 */ 538 switch(size) { 539 case 1: 540 out_8(addr, val >> 24); 541 return 1; 542 case 2: 543 if (port & 1) 544 return -EINVAL; 545 out_le16(addr, val >> 16); 546 return 2; 547 case 4: 548 if (port & 3) 549 return -EINVAL; 550 out_le32(addr, val); 551 return 4; 552 } 553 return -EINVAL; 554 } 555 556 /* This provides legacy IO or memory mmap access on a bus */ 557 int pci_mmap_legacy_page_range(struct pci_bus *bus, 558 struct vm_area_struct *vma, 559 enum pci_mmap_state mmap_state) 560 { 561 struct pci_controller *hose = pci_bus_to_host(bus); 562 resource_size_t offset = 563 ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; 564 resource_size_t size = vma->vm_end - vma->vm_start; 565 struct resource *rp; 566 567 pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n", 568 pci_domain_nr(bus), bus->number, 569 mmap_state == pci_mmap_mem ? "MEM" : "IO", 570 (unsigned long long)offset, 571 (unsigned long long)(offset + size - 1)); 572 573 if (mmap_state == pci_mmap_mem) { 574 /* Hack alert ! 575 * 576 * Because X is lame and can fail starting if it gets an error trying 577 * to mmap legacy_mem (instead of just moving on without legacy memory 578 * access) we fake it here by giving it anonymous memory, effectively 579 * behaving just like /dev/zero 580 */ 581 if ((offset + size) > hose->isa_mem_size) { 582 printk(KERN_DEBUG 583 "Process %s (pid:%d) mapped non-existing PCI legacy memory for 0%04x:%02x\n", 584 current->comm, current->pid, pci_domain_nr(bus), bus->number); 585 if (vma->vm_flags & VM_SHARED) 586 return shmem_zero_setup(vma); 587 return 0; 588 } 589 offset += hose->isa_mem_phys; 590 } else { 591 unsigned long io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; 592 unsigned long roffset = offset + io_offset; 593 rp = &hose->io_resource; 594 if (!(rp->flags & IORESOURCE_IO)) 595 return -ENXIO; 596 if (roffset < rp->start || (roffset + size) > rp->end) 597 return -ENXIO; 598 offset += hose->io_base_phys; 599 } 600 pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset); 601 602 vma->vm_pgoff = offset >> PAGE_SHIFT; 603 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 604 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 605 vma->vm_end - vma->vm_start, 606 vma->vm_page_prot); 607 } 608 609 void pci_resource_to_user(const struct pci_dev *dev, int bar, 610 const struct resource *rsrc, 611 resource_size_t *start, resource_size_t *end) 612 { 613 struct pci_controller *hose = pci_bus_to_host(dev->bus); 614 resource_size_t offset = 0; 615 616 if (hose == NULL) 617 return; 618 619 if (rsrc->flags & IORESOURCE_IO) 620 offset = (unsigned long)hose->io_base_virt - _IO_BASE; 621 622 /* We pass a fully fixed up address to userland for MMIO instead of 623 * a BAR value because X is lame and expects to be able to use that 624 * to pass to /dev/mem ! 625 * 626 * That means that we'll have potentially 64 bits values where some 627 * userland apps only expect 32 (like X itself since it thinks only 628 * Sparc has 64 bits MMIO) but if we don't do that, we break it on 629 * 32 bits CHRPs :-( 630 * 631 * Hopefully, the sysfs insterface is immune to that gunk. Once X 632 * has been fixed (and the fix spread enough), we can re-enable the 633 * 2 lines below and pass down a BAR value to userland. In that case 634 * we'll also have to re-enable the matching code in 635 * __pci_mmap_make_offset(). 636 * 637 * BenH. 638 */ 639 #if 0 640 else if (rsrc->flags & IORESOURCE_MEM) 641 offset = hose->pci_mem_offset; 642 #endif 643 644 *start = rsrc->start - offset; 645 *end = rsrc->end - offset; 646 } 647 648 /** 649 * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree 650 * @hose: newly allocated pci_controller to be setup 651 * @dev: device node of the host bridge 652 * @primary: set if primary bus (32 bits only, soon to be deprecated) 653 * 654 * This function will parse the "ranges" property of a PCI host bridge device 655 * node and setup the resource mapping of a pci controller based on its 656 * content. 657 * 658 * Life would be boring if it wasn't for a few issues that we have to deal 659 * with here: 660 * 661 * - We can only cope with one IO space range and up to 3 Memory space 662 * ranges. However, some machines (thanks Apple !) tend to split their 663 * space into lots of small contiguous ranges. So we have to coalesce. 664 * 665 * - Some busses have IO space not starting at 0, which causes trouble with 666 * the way we do our IO resource renumbering. The code somewhat deals with 667 * it for 64 bits but I would expect problems on 32 bits. 668 * 669 * - Some 32 bits platforms such as 4xx can have physical space larger than 670 * 32 bits so we need to use 64 bits values for the parsing 671 */ 672 void pci_process_bridge_OF_ranges(struct pci_controller *hose, 673 struct device_node *dev, int primary) 674 { 675 int memno = 0; 676 struct resource *res; 677 struct of_pci_range range; 678 struct of_pci_range_parser parser; 679 680 printk(KERN_INFO "PCI host bridge %s %s ranges:\n", 681 dev->full_name, primary ? "(primary)" : ""); 682 683 /* Check for ranges property */ 684 if (of_pci_range_parser_init(&parser, dev)) 685 return; 686 687 /* Parse it */ 688 for_each_of_pci_range(&parser, &range) { 689 /* If we failed translation or got a zero-sized region 690 * (some FW try to feed us with non sensical zero sized regions 691 * such as power3 which look like some kind of attempt at exposing 692 * the VGA memory hole) 693 */ 694 if (range.cpu_addr == OF_BAD_ADDR || range.size == 0) 695 continue; 696 697 /* Act based on address space type */ 698 res = NULL; 699 switch (range.flags & IORESOURCE_TYPE_BITS) { 700 case IORESOURCE_IO: 701 printk(KERN_INFO 702 " IO 0x%016llx..0x%016llx -> 0x%016llx\n", 703 range.cpu_addr, range.cpu_addr + range.size - 1, 704 range.pci_addr); 705 706 /* We support only one IO range */ 707 if (hose->pci_io_size) { 708 printk(KERN_INFO 709 " \\--> Skipped (too many) !\n"); 710 continue; 711 } 712 #ifdef CONFIG_PPC32 713 /* On 32 bits, limit I/O space to 16MB */ 714 if (range.size > 0x01000000) 715 range.size = 0x01000000; 716 717 /* 32 bits needs to map IOs here */ 718 hose->io_base_virt = ioremap(range.cpu_addr, 719 range.size); 720 721 /* Expect trouble if pci_addr is not 0 */ 722 if (primary) 723 isa_io_base = 724 (unsigned long)hose->io_base_virt; 725 #endif /* CONFIG_PPC32 */ 726 /* pci_io_size and io_base_phys always represent IO 727 * space starting at 0 so we factor in pci_addr 728 */ 729 hose->pci_io_size = range.pci_addr + range.size; 730 hose->io_base_phys = range.cpu_addr - range.pci_addr; 731 732 /* Build resource */ 733 res = &hose->io_resource; 734 range.cpu_addr = range.pci_addr; 735 break; 736 case IORESOURCE_MEM: 737 printk(KERN_INFO 738 " MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n", 739 range.cpu_addr, range.cpu_addr + range.size - 1, 740 range.pci_addr, 741 (range.pci_space & 0x40000000) ? 742 "Prefetch" : ""); 743 744 /* We support only 3 memory ranges */ 745 if (memno >= 3) { 746 printk(KERN_INFO 747 " \\--> Skipped (too many) !\n"); 748 continue; 749 } 750 /* Handles ISA memory hole space here */ 751 if (range.pci_addr == 0) { 752 if (primary || isa_mem_base == 0) 753 isa_mem_base = range.cpu_addr; 754 hose->isa_mem_phys = range.cpu_addr; 755 hose->isa_mem_size = range.size; 756 } 757 758 /* Build resource */ 759 hose->mem_offset[memno] = range.cpu_addr - 760 range.pci_addr; 761 res = &hose->mem_resources[memno++]; 762 break; 763 } 764 if (res != NULL) { 765 res->name = dev->full_name; 766 res->flags = range.flags; 767 res->start = range.cpu_addr; 768 res->end = range.cpu_addr + range.size - 1; 769 res->parent = res->child = res->sibling = NULL; 770 } 771 } 772 } 773 774 /* Decide whether to display the domain number in /proc */ 775 int pci_proc_domain(struct pci_bus *bus) 776 { 777 struct pci_controller *hose = pci_bus_to_host(bus); 778 779 if (!pci_has_flag(PCI_ENABLE_PROC_DOMAINS)) 780 return 0; 781 if (pci_has_flag(PCI_COMPAT_DOMAIN_0)) 782 return hose->global_number != 0; 783 return 1; 784 } 785 786 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) 787 { 788 if (ppc_md.pcibios_root_bridge_prepare) 789 return ppc_md.pcibios_root_bridge_prepare(bridge); 790 791 return 0; 792 } 793 794 /* This header fixup will do the resource fixup for all devices as they are 795 * probed, but not for bridge ranges 796 */ 797 static void pcibios_fixup_resources(struct pci_dev *dev) 798 { 799 struct pci_controller *hose = pci_bus_to_host(dev->bus); 800 int i; 801 802 if (!hose) { 803 printk(KERN_ERR "No host bridge for PCI dev %s !\n", 804 pci_name(dev)); 805 return; 806 } 807 808 if (dev->is_virtfn) 809 return; 810 811 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 812 struct resource *res = dev->resource + i; 813 struct pci_bus_region reg; 814 if (!res->flags) 815 continue; 816 817 /* If we're going to re-assign everything, we mark all resources 818 * as unset (and 0-base them). In addition, we mark BARs starting 819 * at 0 as unset as well, except if PCI_PROBE_ONLY is also set 820 * since in that case, we don't want to re-assign anything 821 */ 822 pcibios_resource_to_bus(dev->bus, ®, res); 823 if (pci_has_flag(PCI_REASSIGN_ALL_RSRC) || 824 (reg.start == 0 && !pci_has_flag(PCI_PROBE_ONLY))) { 825 /* Only print message if not re-assigning */ 826 if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) 827 pr_debug("PCI:%s Resource %d %pR is unassigned\n", 828 pci_name(dev), i, res); 829 res->end -= res->start; 830 res->start = 0; 831 res->flags |= IORESOURCE_UNSET; 832 continue; 833 } 834 835 pr_debug("PCI:%s Resource %d %pR\n", pci_name(dev), i, res); 836 } 837 838 /* Call machine specific resource fixup */ 839 if (ppc_md.pcibios_fixup_resources) 840 ppc_md.pcibios_fixup_resources(dev); 841 } 842 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources); 843 844 /* This function tries to figure out if a bridge resource has been initialized 845 * by the firmware or not. It doesn't have to be absolutely bullet proof, but 846 * things go more smoothly when it gets it right. It should covers cases such 847 * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges 848 */ 849 static int pcibios_uninitialized_bridge_resource(struct pci_bus *bus, 850 struct resource *res) 851 { 852 struct pci_controller *hose = pci_bus_to_host(bus); 853 struct pci_dev *dev = bus->self; 854 resource_size_t offset; 855 struct pci_bus_region region; 856 u16 command; 857 int i; 858 859 /* We don't do anything if PCI_PROBE_ONLY is set */ 860 if (pci_has_flag(PCI_PROBE_ONLY)) 861 return 0; 862 863 /* Job is a bit different between memory and IO */ 864 if (res->flags & IORESOURCE_MEM) { 865 pcibios_resource_to_bus(dev->bus, ®ion, res); 866 867 /* If the BAR is non-0 then it's probably been initialized */ 868 if (region.start != 0) 869 return 0; 870 871 /* The BAR is 0, let's check if memory decoding is enabled on 872 * the bridge. If not, we consider it unassigned 873 */ 874 pci_read_config_word(dev, PCI_COMMAND, &command); 875 if ((command & PCI_COMMAND_MEMORY) == 0) 876 return 1; 877 878 /* Memory decoding is enabled and the BAR is 0. If any of the bridge 879 * resources covers that starting address (0 then it's good enough for 880 * us for memory space) 881 */ 882 for (i = 0; i < 3; i++) { 883 if ((hose->mem_resources[i].flags & IORESOURCE_MEM) && 884 hose->mem_resources[i].start == hose->mem_offset[i]) 885 return 0; 886 } 887 888 /* Well, it starts at 0 and we know it will collide so we may as 889 * well consider it as unassigned. That covers the Apple case. 890 */ 891 return 1; 892 } else { 893 /* If the BAR is non-0, then we consider it assigned */ 894 offset = (unsigned long)hose->io_base_virt - _IO_BASE; 895 if (((res->start - offset) & 0xfffffffful) != 0) 896 return 0; 897 898 /* Here, we are a bit different than memory as typically IO space 899 * starting at low addresses -is- valid. What we do instead if that 900 * we consider as unassigned anything that doesn't have IO enabled 901 * in the PCI command register, and that's it. 902 */ 903 pci_read_config_word(dev, PCI_COMMAND, &command); 904 if (command & PCI_COMMAND_IO) 905 return 0; 906 907 /* It's starting at 0 and IO is disabled in the bridge, consider 908 * it unassigned 909 */ 910 return 1; 911 } 912 } 913 914 /* Fixup resources of a PCI<->PCI bridge */ 915 static void pcibios_fixup_bridge(struct pci_bus *bus) 916 { 917 struct resource *res; 918 int i; 919 920 struct pci_dev *dev = bus->self; 921 922 pci_bus_for_each_resource(bus, res, i) { 923 if (!res || !res->flags) 924 continue; 925 if (i >= 3 && bus->self->transparent) 926 continue; 927 928 /* If we're going to reassign everything, we can 929 * shrink the P2P resource to have size as being 930 * of 0 in order to save space. 931 */ 932 if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) { 933 res->flags |= IORESOURCE_UNSET; 934 res->start = 0; 935 res->end = -1; 936 continue; 937 } 938 939 pr_debug("PCI:%s Bus rsrc %d %pR\n", pci_name(dev), i, res); 940 941 /* Try to detect uninitialized P2P bridge resources, 942 * and clear them out so they get re-assigned later 943 */ 944 if (pcibios_uninitialized_bridge_resource(bus, res)) { 945 res->flags = 0; 946 pr_debug("PCI:%s (unassigned)\n", pci_name(dev)); 947 } 948 } 949 } 950 951 void pcibios_setup_bus_self(struct pci_bus *bus) 952 { 953 struct pci_controller *phb; 954 955 /* Fix up the bus resources for P2P bridges */ 956 if (bus->self != NULL) 957 pcibios_fixup_bridge(bus); 958 959 /* Platform specific bus fixups. This is currently only used 960 * by fsl_pci and I'm hoping to get rid of it at some point 961 */ 962 if (ppc_md.pcibios_fixup_bus) 963 ppc_md.pcibios_fixup_bus(bus); 964 965 /* Setup bus DMA mappings */ 966 phb = pci_bus_to_host(bus); 967 if (phb->controller_ops.dma_bus_setup) 968 phb->controller_ops.dma_bus_setup(bus); 969 } 970 971 static void pcibios_setup_device(struct pci_dev *dev) 972 { 973 struct pci_controller *phb; 974 /* Fixup NUMA node as it may not be setup yet by the generic 975 * code and is needed by the DMA init 976 */ 977 set_dev_node(&dev->dev, pcibus_to_node(dev->bus)); 978 979 /* Hook up default DMA ops */ 980 set_dma_ops(&dev->dev, pci_dma_ops); 981 set_dma_offset(&dev->dev, PCI_DRAM_OFFSET); 982 983 /* Additional platform DMA/iommu setup */ 984 phb = pci_bus_to_host(dev->bus); 985 if (phb->controller_ops.dma_dev_setup) 986 phb->controller_ops.dma_dev_setup(dev); 987 988 /* Read default IRQs and fixup if necessary */ 989 pci_read_irq_line(dev); 990 if (ppc_md.pci_irq_fixup) 991 ppc_md.pci_irq_fixup(dev); 992 } 993 994 int pcibios_add_device(struct pci_dev *dev) 995 { 996 /* 997 * We can only call pcibios_setup_device() after bus setup is complete, 998 * since some of the platform specific DMA setup code depends on it. 999 */ 1000 if (dev->bus->is_added) 1001 pcibios_setup_device(dev); 1002 1003 #ifdef CONFIG_PCI_IOV 1004 if (ppc_md.pcibios_fixup_sriov) 1005 ppc_md.pcibios_fixup_sriov(dev); 1006 #endif /* CONFIG_PCI_IOV */ 1007 1008 return 0; 1009 } 1010 1011 void pcibios_setup_bus_devices(struct pci_bus *bus) 1012 { 1013 struct pci_dev *dev; 1014 1015 pr_debug("PCI: Fixup bus devices %d (%s)\n", 1016 bus->number, bus->self ? pci_name(bus->self) : "PHB"); 1017 1018 list_for_each_entry(dev, &bus->devices, bus_list) { 1019 /* Cardbus can call us to add new devices to a bus, so ignore 1020 * those who are already fully discovered 1021 */ 1022 if (dev->is_added) 1023 continue; 1024 1025 pcibios_setup_device(dev); 1026 } 1027 } 1028 1029 void pcibios_set_master(struct pci_dev *dev) 1030 { 1031 /* No special bus mastering setup handling */ 1032 } 1033 1034 void pcibios_fixup_bus(struct pci_bus *bus) 1035 { 1036 /* When called from the generic PCI probe, read PCI<->PCI bridge 1037 * bases. This is -not- called when generating the PCI tree from 1038 * the OF device-tree. 1039 */ 1040 pci_read_bridge_bases(bus); 1041 1042 /* Now fixup the bus bus */ 1043 pcibios_setup_bus_self(bus); 1044 1045 /* Now fixup devices on that bus */ 1046 pcibios_setup_bus_devices(bus); 1047 } 1048 EXPORT_SYMBOL(pcibios_fixup_bus); 1049 1050 void pci_fixup_cardbus(struct pci_bus *bus) 1051 { 1052 /* Now fixup devices on that bus */ 1053 pcibios_setup_bus_devices(bus); 1054 } 1055 1056 1057 static int skip_isa_ioresource_align(struct pci_dev *dev) 1058 { 1059 if (pci_has_flag(PCI_CAN_SKIP_ISA_ALIGN) && 1060 !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA)) 1061 return 1; 1062 return 0; 1063 } 1064 1065 /* 1066 * We need to avoid collisions with `mirrored' VGA ports 1067 * and other strange ISA hardware, so we always want the 1068 * addresses to be allocated in the 0x000-0x0ff region 1069 * modulo 0x400. 1070 * 1071 * Why? Because some silly external IO cards only decode 1072 * the low 10 bits of the IO address. The 0x00-0xff region 1073 * is reserved for motherboard devices that decode all 16 1074 * bits, so it's ok to allocate at, say, 0x2800-0x28ff, 1075 * but we want to try to avoid allocating at 0x2900-0x2bff 1076 * which might have be mirrored at 0x0100-0x03ff.. 1077 */ 1078 resource_size_t pcibios_align_resource(void *data, const struct resource *res, 1079 resource_size_t size, resource_size_t align) 1080 { 1081 struct pci_dev *dev = data; 1082 resource_size_t start = res->start; 1083 1084 if (res->flags & IORESOURCE_IO) { 1085 if (skip_isa_ioresource_align(dev)) 1086 return start; 1087 if (start & 0x300) 1088 start = (start + 0x3ff) & ~0x3ff; 1089 } 1090 1091 return start; 1092 } 1093 EXPORT_SYMBOL(pcibios_align_resource); 1094 1095 /* 1096 * Reparent resource children of pr that conflict with res 1097 * under res, and make res replace those children. 1098 */ 1099 static int reparent_resources(struct resource *parent, 1100 struct resource *res) 1101 { 1102 struct resource *p, **pp; 1103 struct resource **firstpp = NULL; 1104 1105 for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) { 1106 if (p->end < res->start) 1107 continue; 1108 if (res->end < p->start) 1109 break; 1110 if (p->start < res->start || p->end > res->end) 1111 return -1; /* not completely contained */ 1112 if (firstpp == NULL) 1113 firstpp = pp; 1114 } 1115 if (firstpp == NULL) 1116 return -1; /* didn't find any conflicting entries? */ 1117 res->parent = parent; 1118 res->child = *firstpp; 1119 res->sibling = *pp; 1120 *firstpp = res; 1121 *pp = NULL; 1122 for (p = res->child; p != NULL; p = p->sibling) { 1123 p->parent = res; 1124 pr_debug("PCI: Reparented %s %pR under %s\n", 1125 p->name, p, res->name); 1126 } 1127 return 0; 1128 } 1129 1130 /* 1131 * Handle resources of PCI devices. If the world were perfect, we could 1132 * just allocate all the resource regions and do nothing more. It isn't. 1133 * On the other hand, we cannot just re-allocate all devices, as it would 1134 * require us to know lots of host bridge internals. So we attempt to 1135 * keep as much of the original configuration as possible, but tweak it 1136 * when it's found to be wrong. 1137 * 1138 * Known BIOS problems we have to work around: 1139 * - I/O or memory regions not configured 1140 * - regions configured, but not enabled in the command register 1141 * - bogus I/O addresses above 64K used 1142 * - expansion ROMs left enabled (this may sound harmless, but given 1143 * the fact the PCI specs explicitly allow address decoders to be 1144 * shared between expansion ROMs and other resource regions, it's 1145 * at least dangerous) 1146 * 1147 * Our solution: 1148 * (1) Allocate resources for all buses behind PCI-to-PCI bridges. 1149 * This gives us fixed barriers on where we can allocate. 1150 * (2) Allocate resources for all enabled devices. If there is 1151 * a collision, just mark the resource as unallocated. Also 1152 * disable expansion ROMs during this step. 1153 * (3) Try to allocate resources for disabled devices. If the 1154 * resources were assigned correctly, everything goes well, 1155 * if they weren't, they won't disturb allocation of other 1156 * resources. 1157 * (4) Assign new addresses to resources which were either 1158 * not configured at all or misconfigured. If explicitly 1159 * requested by the user, configure expansion ROM address 1160 * as well. 1161 */ 1162 1163 static void pcibios_allocate_bus_resources(struct pci_bus *bus) 1164 { 1165 struct pci_bus *b; 1166 int i; 1167 struct resource *res, *pr; 1168 1169 pr_debug("PCI: Allocating bus resources for %04x:%02x...\n", 1170 pci_domain_nr(bus), bus->number); 1171 1172 pci_bus_for_each_resource(bus, res, i) { 1173 if (!res || !res->flags || res->start > res->end || res->parent) 1174 continue; 1175 1176 /* If the resource was left unset at this point, we clear it */ 1177 if (res->flags & IORESOURCE_UNSET) 1178 goto clear_resource; 1179 1180 if (bus->parent == NULL) 1181 pr = (res->flags & IORESOURCE_IO) ? 1182 &ioport_resource : &iomem_resource; 1183 else { 1184 pr = pci_find_parent_resource(bus->self, res); 1185 if (pr == res) { 1186 /* this happens when the generic PCI 1187 * code (wrongly) decides that this 1188 * bridge is transparent -- paulus 1189 */ 1190 continue; 1191 } 1192 } 1193 1194 pr_debug("PCI: %s (bus %d) bridge rsrc %d: %pR, parent %p (%s)\n", 1195 bus->self ? pci_name(bus->self) : "PHB", bus->number, 1196 i, res, pr, (pr && pr->name) ? pr->name : "nil"); 1197 1198 if (pr && !(pr->flags & IORESOURCE_UNSET)) { 1199 struct pci_dev *dev = bus->self; 1200 1201 if (request_resource(pr, res) == 0) 1202 continue; 1203 /* 1204 * Must be a conflict with an existing entry. 1205 * Move that entry (or entries) under the 1206 * bridge resource and try again. 1207 */ 1208 if (reparent_resources(pr, res) == 0) 1209 continue; 1210 1211 if (dev && i < PCI_BRIDGE_RESOURCE_NUM && 1212 pci_claim_bridge_resource(dev, 1213 i + PCI_BRIDGE_RESOURCES) == 0) 1214 continue; 1215 } 1216 pr_warning("PCI: Cannot allocate resource region " 1217 "%d of PCI bridge %d, will remap\n", i, bus->number); 1218 clear_resource: 1219 /* The resource might be figured out when doing 1220 * reassignment based on the resources required 1221 * by the downstream PCI devices. Here we set 1222 * the size of the resource to be 0 in order to 1223 * save more space. 1224 */ 1225 res->start = 0; 1226 res->end = -1; 1227 res->flags = 0; 1228 } 1229 1230 list_for_each_entry(b, &bus->children, node) 1231 pcibios_allocate_bus_resources(b); 1232 } 1233 1234 static inline void alloc_resource(struct pci_dev *dev, int idx) 1235 { 1236 struct resource *pr, *r = &dev->resource[idx]; 1237 1238 pr_debug("PCI: Allocating %s: Resource %d: %pR\n", 1239 pci_name(dev), idx, r); 1240 1241 pr = pci_find_parent_resource(dev, r); 1242 if (!pr || (pr->flags & IORESOURCE_UNSET) || 1243 request_resource(pr, r) < 0) { 1244 printk(KERN_WARNING "PCI: Cannot allocate resource region %d" 1245 " of device %s, will remap\n", idx, pci_name(dev)); 1246 if (pr) 1247 pr_debug("PCI: parent is %p: %pR\n", pr, pr); 1248 /* We'll assign a new address later */ 1249 r->flags |= IORESOURCE_UNSET; 1250 r->end -= r->start; 1251 r->start = 0; 1252 } 1253 } 1254 1255 static void __init pcibios_allocate_resources(int pass) 1256 { 1257 struct pci_dev *dev = NULL; 1258 int idx, disabled; 1259 u16 command; 1260 struct resource *r; 1261 1262 for_each_pci_dev(dev) { 1263 pci_read_config_word(dev, PCI_COMMAND, &command); 1264 for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) { 1265 r = &dev->resource[idx]; 1266 if (r->parent) /* Already allocated */ 1267 continue; 1268 if (!r->flags || (r->flags & IORESOURCE_UNSET)) 1269 continue; /* Not assigned at all */ 1270 /* We only allocate ROMs on pass 1 just in case they 1271 * have been screwed up by firmware 1272 */ 1273 if (idx == PCI_ROM_RESOURCE ) 1274 disabled = 1; 1275 if (r->flags & IORESOURCE_IO) 1276 disabled = !(command & PCI_COMMAND_IO); 1277 else 1278 disabled = !(command & PCI_COMMAND_MEMORY); 1279 if (pass == disabled) 1280 alloc_resource(dev, idx); 1281 } 1282 if (pass) 1283 continue; 1284 r = &dev->resource[PCI_ROM_RESOURCE]; 1285 if (r->flags) { 1286 /* Turn the ROM off, leave the resource region, 1287 * but keep it unregistered. 1288 */ 1289 u32 reg; 1290 pci_read_config_dword(dev, dev->rom_base_reg, ®); 1291 if (reg & PCI_ROM_ADDRESS_ENABLE) { 1292 pr_debug("PCI: Switching off ROM of %s\n", 1293 pci_name(dev)); 1294 r->flags &= ~IORESOURCE_ROM_ENABLE; 1295 pci_write_config_dword(dev, dev->rom_base_reg, 1296 reg & ~PCI_ROM_ADDRESS_ENABLE); 1297 } 1298 } 1299 } 1300 } 1301 1302 static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus) 1303 { 1304 struct pci_controller *hose = pci_bus_to_host(bus); 1305 resource_size_t offset; 1306 struct resource *res, *pres; 1307 int i; 1308 1309 pr_debug("Reserving legacy ranges for domain %04x\n", pci_domain_nr(bus)); 1310 1311 /* Check for IO */ 1312 if (!(hose->io_resource.flags & IORESOURCE_IO)) 1313 goto no_io; 1314 offset = (unsigned long)hose->io_base_virt - _IO_BASE; 1315 res = kzalloc(sizeof(struct resource), GFP_KERNEL); 1316 BUG_ON(res == NULL); 1317 res->name = "Legacy IO"; 1318 res->flags = IORESOURCE_IO; 1319 res->start = offset; 1320 res->end = (offset + 0xfff) & 0xfffffffful; 1321 pr_debug("Candidate legacy IO: %pR\n", res); 1322 if (request_resource(&hose->io_resource, res)) { 1323 printk(KERN_DEBUG 1324 "PCI %04x:%02x Cannot reserve Legacy IO %pR\n", 1325 pci_domain_nr(bus), bus->number, res); 1326 kfree(res); 1327 } 1328 1329 no_io: 1330 /* Check for memory */ 1331 for (i = 0; i < 3; i++) { 1332 pres = &hose->mem_resources[i]; 1333 offset = hose->mem_offset[i]; 1334 if (!(pres->flags & IORESOURCE_MEM)) 1335 continue; 1336 pr_debug("hose mem res: %pR\n", pres); 1337 if ((pres->start - offset) <= 0xa0000 && 1338 (pres->end - offset) >= 0xbffff) 1339 break; 1340 } 1341 if (i >= 3) 1342 return; 1343 res = kzalloc(sizeof(struct resource), GFP_KERNEL); 1344 BUG_ON(res == NULL); 1345 res->name = "Legacy VGA memory"; 1346 res->flags = IORESOURCE_MEM; 1347 res->start = 0xa0000 + offset; 1348 res->end = 0xbffff + offset; 1349 pr_debug("Candidate VGA memory: %pR\n", res); 1350 if (request_resource(pres, res)) { 1351 printk(KERN_DEBUG 1352 "PCI %04x:%02x Cannot reserve VGA memory %pR\n", 1353 pci_domain_nr(bus), bus->number, res); 1354 kfree(res); 1355 } 1356 } 1357 1358 void __init pcibios_resource_survey(void) 1359 { 1360 struct pci_bus *b; 1361 1362 /* Allocate and assign resources */ 1363 list_for_each_entry(b, &pci_root_buses, node) 1364 pcibios_allocate_bus_resources(b); 1365 pcibios_allocate_resources(0); 1366 pcibios_allocate_resources(1); 1367 1368 /* Before we start assigning unassigned resource, we try to reserve 1369 * the low IO area and the VGA memory area if they intersect the 1370 * bus available resources to avoid allocating things on top of them 1371 */ 1372 if (!pci_has_flag(PCI_PROBE_ONLY)) { 1373 list_for_each_entry(b, &pci_root_buses, node) 1374 pcibios_reserve_legacy_regions(b); 1375 } 1376 1377 /* Now, if the platform didn't decide to blindly trust the firmware, 1378 * we proceed to assigning things that were left unassigned 1379 */ 1380 if (!pci_has_flag(PCI_PROBE_ONLY)) { 1381 pr_debug("PCI: Assigning unassigned resources...\n"); 1382 pci_assign_unassigned_resources(); 1383 } 1384 1385 /* Call machine dependent fixup */ 1386 if (ppc_md.pcibios_fixup) 1387 ppc_md.pcibios_fixup(); 1388 } 1389 1390 /* This is used by the PCI hotplug driver to allocate resource 1391 * of newly plugged busses. We can try to consolidate with the 1392 * rest of the code later, for now, keep it as-is as our main 1393 * resource allocation function doesn't deal with sub-trees yet. 1394 */ 1395 void pcibios_claim_one_bus(struct pci_bus *bus) 1396 { 1397 struct pci_dev *dev; 1398 struct pci_bus *child_bus; 1399 1400 list_for_each_entry(dev, &bus->devices, bus_list) { 1401 int i; 1402 1403 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 1404 struct resource *r = &dev->resource[i]; 1405 1406 if (r->parent || !r->start || !r->flags) 1407 continue; 1408 1409 pr_debug("PCI: Claiming %s: Resource %d: %pR\n", 1410 pci_name(dev), i, r); 1411 1412 if (pci_claim_resource(dev, i) == 0) 1413 continue; 1414 1415 pci_claim_bridge_resource(dev, i); 1416 } 1417 } 1418 1419 list_for_each_entry(child_bus, &bus->children, node) 1420 pcibios_claim_one_bus(child_bus); 1421 } 1422 EXPORT_SYMBOL_GPL(pcibios_claim_one_bus); 1423 1424 1425 /* pcibios_finish_adding_to_bus 1426 * 1427 * This is to be called by the hotplug code after devices have been 1428 * added to a bus, this include calling it for a PHB that is just 1429 * being added 1430 */ 1431 void pcibios_finish_adding_to_bus(struct pci_bus *bus) 1432 { 1433 pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n", 1434 pci_domain_nr(bus), bus->number); 1435 1436 /* Allocate bus and devices resources */ 1437 pcibios_allocate_bus_resources(bus); 1438 pcibios_claim_one_bus(bus); 1439 if (!pci_has_flag(PCI_PROBE_ONLY)) 1440 pci_assign_unassigned_bus_resources(bus); 1441 1442 /* Fixup EEH */ 1443 eeh_add_device_tree_late(bus); 1444 1445 /* Add new devices to global lists. Register in proc, sysfs. */ 1446 pci_bus_add_devices(bus); 1447 1448 /* sysfs files should only be added after devices are added */ 1449 eeh_add_sysfs_files(bus); 1450 } 1451 EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus); 1452 1453 int pcibios_enable_device(struct pci_dev *dev, int mask) 1454 { 1455 struct pci_controller *phb = pci_bus_to_host(dev->bus); 1456 1457 if (phb->controller_ops.enable_device_hook) 1458 if (!phb->controller_ops.enable_device_hook(dev)) 1459 return -EINVAL; 1460 1461 return pci_enable_resources(dev, mask); 1462 } 1463 1464 void pcibios_disable_device(struct pci_dev *dev) 1465 { 1466 struct pci_controller *phb = pci_bus_to_host(dev->bus); 1467 1468 if (phb->controller_ops.disable_device) 1469 phb->controller_ops.disable_device(dev); 1470 } 1471 1472 resource_size_t pcibios_io_space_offset(struct pci_controller *hose) 1473 { 1474 return (unsigned long) hose->io_base_virt - _IO_BASE; 1475 } 1476 1477 static void pcibios_setup_phb_resources(struct pci_controller *hose, 1478 struct list_head *resources) 1479 { 1480 struct resource *res; 1481 resource_size_t offset; 1482 int i; 1483 1484 /* Hookup PHB IO resource */ 1485 res = &hose->io_resource; 1486 1487 if (!res->flags) { 1488 pr_info("PCI: I/O resource not set for host" 1489 " bridge %s (domain %d)\n", 1490 hose->dn->full_name, hose->global_number); 1491 } else { 1492 offset = pcibios_io_space_offset(hose); 1493 1494 pr_debug("PCI: PHB IO resource = %pR off 0x%08llx\n", 1495 res, (unsigned long long)offset); 1496 pci_add_resource_offset(resources, res, offset); 1497 } 1498 1499 /* Hookup PHB Memory resources */ 1500 for (i = 0; i < 3; ++i) { 1501 res = &hose->mem_resources[i]; 1502 if (!res->flags) { 1503 if (i == 0) 1504 printk(KERN_ERR "PCI: Memory resource 0 not set for " 1505 "host bridge %s (domain %d)\n", 1506 hose->dn->full_name, hose->global_number); 1507 continue; 1508 } 1509 offset = hose->mem_offset[i]; 1510 1511 1512 pr_debug("PCI: PHB MEM resource %d = %pR off 0x%08llx\n", i, 1513 res, (unsigned long long)offset); 1514 1515 pci_add_resource_offset(resources, res, offset); 1516 } 1517 } 1518 1519 /* 1520 * Null PCI config access functions, for the case when we can't 1521 * find a hose. 1522 */ 1523 #define NULL_PCI_OP(rw, size, type) \ 1524 static int \ 1525 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \ 1526 { \ 1527 return PCIBIOS_DEVICE_NOT_FOUND; \ 1528 } 1529 1530 static int 1531 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset, 1532 int len, u32 *val) 1533 { 1534 return PCIBIOS_DEVICE_NOT_FOUND; 1535 } 1536 1537 static int 1538 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset, 1539 int len, u32 val) 1540 { 1541 return PCIBIOS_DEVICE_NOT_FOUND; 1542 } 1543 1544 static struct pci_ops null_pci_ops = 1545 { 1546 .read = null_read_config, 1547 .write = null_write_config, 1548 }; 1549 1550 /* 1551 * These functions are used early on before PCI scanning is done 1552 * and all of the pci_dev and pci_bus structures have been created. 1553 */ 1554 static struct pci_bus * 1555 fake_pci_bus(struct pci_controller *hose, int busnr) 1556 { 1557 static struct pci_bus bus; 1558 1559 if (hose == NULL) { 1560 printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr); 1561 } 1562 bus.number = busnr; 1563 bus.sysdata = hose; 1564 bus.ops = hose? hose->ops: &null_pci_ops; 1565 return &bus; 1566 } 1567 1568 #define EARLY_PCI_OP(rw, size, type) \ 1569 int early_##rw##_config_##size(struct pci_controller *hose, int bus, \ 1570 int devfn, int offset, type value) \ 1571 { \ 1572 return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \ 1573 devfn, offset, value); \ 1574 } 1575 1576 EARLY_PCI_OP(read, byte, u8 *) 1577 EARLY_PCI_OP(read, word, u16 *) 1578 EARLY_PCI_OP(read, dword, u32 *) 1579 EARLY_PCI_OP(write, byte, u8) 1580 EARLY_PCI_OP(write, word, u16) 1581 EARLY_PCI_OP(write, dword, u32) 1582 1583 int early_find_capability(struct pci_controller *hose, int bus, int devfn, 1584 int cap) 1585 { 1586 return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap); 1587 } 1588 1589 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) 1590 { 1591 struct pci_controller *hose = bus->sysdata; 1592 1593 return of_node_get(hose->dn); 1594 } 1595 1596 /** 1597 * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus 1598 * @hose: Pointer to the PCI host controller instance structure 1599 */ 1600 void pcibios_scan_phb(struct pci_controller *hose) 1601 { 1602 LIST_HEAD(resources); 1603 struct pci_bus *bus; 1604 struct device_node *node = hose->dn; 1605 int mode; 1606 1607 pr_debug("PCI: Scanning PHB %s\n", of_node_full_name(node)); 1608 1609 /* Get some IO space for the new PHB */ 1610 pcibios_setup_phb_io_space(hose); 1611 1612 /* Wire up PHB bus resources */ 1613 pcibios_setup_phb_resources(hose, &resources); 1614 1615 hose->busn.start = hose->first_busno; 1616 hose->busn.end = hose->last_busno; 1617 hose->busn.flags = IORESOURCE_BUS; 1618 pci_add_resource(&resources, &hose->busn); 1619 1620 /* Create an empty bus for the toplevel */ 1621 bus = pci_create_root_bus(hose->parent, hose->first_busno, 1622 hose->ops, hose, &resources); 1623 if (bus == NULL) { 1624 pr_err("Failed to create bus for PCI domain %04x\n", 1625 hose->global_number); 1626 pci_free_resource_list(&resources); 1627 return; 1628 } 1629 hose->bus = bus; 1630 1631 /* Get probe mode and perform scan */ 1632 mode = PCI_PROBE_NORMAL; 1633 if (node && hose->controller_ops.probe_mode) 1634 mode = hose->controller_ops.probe_mode(bus); 1635 pr_debug(" probe mode: %d\n", mode); 1636 if (mode == PCI_PROBE_DEVTREE) 1637 of_scan_bus(node, bus); 1638 1639 if (mode == PCI_PROBE_NORMAL) { 1640 pci_bus_update_busn_res_end(bus, 255); 1641 hose->last_busno = pci_scan_child_bus(bus); 1642 pci_bus_update_busn_res_end(bus, hose->last_busno); 1643 } 1644 1645 /* Platform gets a chance to do some global fixups before 1646 * we proceed to resource allocation 1647 */ 1648 if (ppc_md.pcibios_fixup_phb) 1649 ppc_md.pcibios_fixup_phb(hose); 1650 1651 /* Configure PCI Express settings */ 1652 if (bus && !pci_has_flag(PCI_PROBE_ONLY)) { 1653 struct pci_bus *child; 1654 list_for_each_entry(child, &bus->children, node) 1655 pcie_bus_configure_settings(child); 1656 } 1657 } 1658 EXPORT_SYMBOL_GPL(pcibios_scan_phb); 1659 1660 static void fixup_hide_host_resource_fsl(struct pci_dev *dev) 1661 { 1662 int i, class = dev->class >> 8; 1663 /* When configured as agent, programing interface = 1 */ 1664 int prog_if = dev->class & 0xf; 1665 1666 if ((class == PCI_CLASS_PROCESSOR_POWERPC || 1667 class == PCI_CLASS_BRIDGE_OTHER) && 1668 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) && 1669 (prog_if == 0) && 1670 (dev->bus->parent == NULL)) { 1671 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 1672 dev->resource[i].start = 0; 1673 dev->resource[i].end = 0; 1674 dev->resource[i].flags = 0; 1675 } 1676 } 1677 } 1678 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl); 1679 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl); 1680 1681 static void fixup_vga(struct pci_dev *pdev) 1682 { 1683 u16 cmd; 1684 1685 pci_read_config_word(pdev, PCI_COMMAND, &cmd); 1686 if ((cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) || !vga_default_device()) 1687 vga_set_default_device(pdev); 1688 1689 } 1690 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID, 1691 PCI_CLASS_DISPLAY_VGA, 8, fixup_vga); 1692