1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Contains common pci routines for ALL ppc platform 4 * (based on pci_32.c and pci_64.c) 5 * 6 * Port for PPC64 David Engebretsen, IBM Corp. 7 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands. 8 * 9 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM 10 * Rework, based on alpha PCI code. 11 * 12 * Common pmac/prep/chrp pci routines. -- Cort 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/pci.h> 17 #include <linux/string.h> 18 #include <linux/init.h> 19 #include <linux/delay.h> 20 #include <linux/export.h> 21 #include <linux/of_address.h> 22 #include <linux/of_pci.h> 23 #include <linux/mm.h> 24 #include <linux/shmem_fs.h> 25 #include <linux/list.h> 26 #include <linux/syscalls.h> 27 #include <linux/irq.h> 28 #include <linux/vmalloc.h> 29 #include <linux/slab.h> 30 #include <linux/vgaarb.h> 31 #include <linux/numa.h> 32 33 #include <asm/processor.h> 34 #include <asm/io.h> 35 #include <asm/prom.h> 36 #include <asm/pci-bridge.h> 37 #include <asm/byteorder.h> 38 #include <asm/machdep.h> 39 #include <asm/ppc-pci.h> 40 #include <asm/eeh.h> 41 42 #include "../../../drivers/pci/pci.h" 43 44 /* hose_spinlock protects accesses to the the phb_bitmap. */ 45 static DEFINE_SPINLOCK(hose_spinlock); 46 LIST_HEAD(hose_list); 47 48 /* For dynamic PHB numbering on get_phb_number(): max number of PHBs. */ 49 #define MAX_PHBS 0x10000 50 51 /* 52 * For dynamic PHB numbering: used/free PHBs tracking bitmap. 53 * Accesses to this bitmap should be protected by hose_spinlock. 54 */ 55 static DECLARE_BITMAP(phb_bitmap, MAX_PHBS); 56 57 /* ISA Memory physical address */ 58 resource_size_t isa_mem_base; 59 EXPORT_SYMBOL(isa_mem_base); 60 61 62 static const struct dma_map_ops *pci_dma_ops; 63 64 void set_pci_dma_ops(const struct dma_map_ops *dma_ops) 65 { 66 pci_dma_ops = dma_ops; 67 } 68 69 /* 70 * This function should run under locking protection, specifically 71 * hose_spinlock. 72 */ 73 static int get_phb_number(struct device_node *dn) 74 { 75 int ret, phb_id = -1; 76 u32 prop_32; 77 u64 prop; 78 79 /* 80 * Try fixed PHB numbering first, by checking archs and reading 81 * the respective device-tree properties. Firstly, try powernv by 82 * reading "ibm,opal-phbid", only present in OPAL environment. 83 */ 84 ret = of_property_read_u64(dn, "ibm,opal-phbid", &prop); 85 if (ret) { 86 ret = of_property_read_u32_index(dn, "reg", 1, &prop_32); 87 prop = prop_32; 88 } 89 90 if (!ret) 91 phb_id = (int)(prop & (MAX_PHBS - 1)); 92 93 /* We need to be sure to not use the same PHB number twice. */ 94 if ((phb_id >= 0) && !test_and_set_bit(phb_id, phb_bitmap)) 95 return phb_id; 96 97 /* 98 * If not pseries nor powernv, or if fixed PHB numbering tried to add 99 * the same PHB number twice, then fallback to dynamic PHB numbering. 100 */ 101 phb_id = find_first_zero_bit(phb_bitmap, MAX_PHBS); 102 BUG_ON(phb_id >= MAX_PHBS); 103 set_bit(phb_id, phb_bitmap); 104 105 return phb_id; 106 } 107 108 struct pci_controller *pcibios_alloc_controller(struct device_node *dev) 109 { 110 struct pci_controller *phb; 111 112 phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL); 113 if (phb == NULL) 114 return NULL; 115 spin_lock(&hose_spinlock); 116 phb->global_number = get_phb_number(dev); 117 list_add_tail(&phb->list_node, &hose_list); 118 spin_unlock(&hose_spinlock); 119 phb->dn = dev; 120 phb->is_dynamic = slab_is_available(); 121 #ifdef CONFIG_PPC64 122 if (dev) { 123 int nid = of_node_to_nid(dev); 124 125 if (nid < 0 || !node_online(nid)) 126 nid = NUMA_NO_NODE; 127 128 PHB_SET_NODE(phb, nid); 129 } 130 #endif 131 return phb; 132 } 133 EXPORT_SYMBOL_GPL(pcibios_alloc_controller); 134 135 void pcibios_free_controller(struct pci_controller *phb) 136 { 137 spin_lock(&hose_spinlock); 138 139 /* Clear bit of phb_bitmap to allow reuse of this PHB number. */ 140 if (phb->global_number < MAX_PHBS) 141 clear_bit(phb->global_number, phb_bitmap); 142 143 list_del(&phb->list_node); 144 spin_unlock(&hose_spinlock); 145 146 if (phb->is_dynamic) 147 kfree(phb); 148 } 149 EXPORT_SYMBOL_GPL(pcibios_free_controller); 150 151 /* 152 * This function is used to call pcibios_free_controller() 153 * in a deferred manner: a callback from the PCI subsystem. 154 * 155 * _*DO NOT*_ call pcibios_free_controller() explicitly if 156 * this is used (or it may access an invalid *phb pointer). 157 * 158 * The callback occurs when all references to the root bus 159 * are dropped (e.g., child buses/devices and their users). 160 * 161 * It's called as .release_fn() of 'struct pci_host_bridge' 162 * which is associated with the 'struct pci_controller.bus' 163 * (root bus) - it expects .release_data to hold a pointer 164 * to 'struct pci_controller'. 165 * 166 * In order to use it, register .release_fn()/release_data 167 * like this: 168 * 169 * pci_set_host_bridge_release(bridge, 170 * pcibios_free_controller_deferred 171 * (void *) phb); 172 * 173 * e.g. in the pcibios_root_bridge_prepare() callback from 174 * pci_create_root_bus(). 175 */ 176 void pcibios_free_controller_deferred(struct pci_host_bridge *bridge) 177 { 178 struct pci_controller *phb = (struct pci_controller *) 179 bridge->release_data; 180 181 pr_debug("domain %d, dynamic %d\n", phb->global_number, phb->is_dynamic); 182 183 pcibios_free_controller(phb); 184 } 185 EXPORT_SYMBOL_GPL(pcibios_free_controller_deferred); 186 187 /* 188 * The function is used to return the minimal alignment 189 * for memory or I/O windows of the associated P2P bridge. 190 * By default, 4KiB alignment for I/O windows and 1MiB for 191 * memory windows. 192 */ 193 resource_size_t pcibios_window_alignment(struct pci_bus *bus, 194 unsigned long type) 195 { 196 struct pci_controller *phb = pci_bus_to_host(bus); 197 198 if (phb->controller_ops.window_alignment) 199 return phb->controller_ops.window_alignment(bus, type); 200 201 /* 202 * PCI core will figure out the default 203 * alignment: 4KiB for I/O and 1MiB for 204 * memory window. 205 */ 206 return 1; 207 } 208 209 void pcibios_setup_bridge(struct pci_bus *bus, unsigned long type) 210 { 211 struct pci_controller *hose = pci_bus_to_host(bus); 212 213 if (hose->controller_ops.setup_bridge) 214 hose->controller_ops.setup_bridge(bus, type); 215 } 216 217 void pcibios_reset_secondary_bus(struct pci_dev *dev) 218 { 219 struct pci_controller *phb = pci_bus_to_host(dev->bus); 220 221 if (phb->controller_ops.reset_secondary_bus) { 222 phb->controller_ops.reset_secondary_bus(dev); 223 return; 224 } 225 226 pci_reset_secondary_bus(dev); 227 } 228 229 resource_size_t pcibios_default_alignment(void) 230 { 231 if (ppc_md.pcibios_default_alignment) 232 return ppc_md.pcibios_default_alignment(); 233 234 return 0; 235 } 236 237 #ifdef CONFIG_PCI_IOV 238 resource_size_t pcibios_iov_resource_alignment(struct pci_dev *pdev, int resno) 239 { 240 if (ppc_md.pcibios_iov_resource_alignment) 241 return ppc_md.pcibios_iov_resource_alignment(pdev, resno); 242 243 return pci_iov_resource_size(pdev, resno); 244 } 245 246 int pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs) 247 { 248 if (ppc_md.pcibios_sriov_enable) 249 return ppc_md.pcibios_sriov_enable(pdev, num_vfs); 250 251 return 0; 252 } 253 254 int pcibios_sriov_disable(struct pci_dev *pdev) 255 { 256 if (ppc_md.pcibios_sriov_disable) 257 return ppc_md.pcibios_sriov_disable(pdev); 258 259 return 0; 260 } 261 262 #endif /* CONFIG_PCI_IOV */ 263 264 static resource_size_t pcibios_io_size(const struct pci_controller *hose) 265 { 266 #ifdef CONFIG_PPC64 267 return hose->pci_io_size; 268 #else 269 return resource_size(&hose->io_resource); 270 #endif 271 } 272 273 int pcibios_vaddr_is_ioport(void __iomem *address) 274 { 275 int ret = 0; 276 struct pci_controller *hose; 277 resource_size_t size; 278 279 spin_lock(&hose_spinlock); 280 list_for_each_entry(hose, &hose_list, list_node) { 281 size = pcibios_io_size(hose); 282 if (address >= hose->io_base_virt && 283 address < (hose->io_base_virt + size)) { 284 ret = 1; 285 break; 286 } 287 } 288 spin_unlock(&hose_spinlock); 289 return ret; 290 } 291 292 unsigned long pci_address_to_pio(phys_addr_t address) 293 { 294 struct pci_controller *hose; 295 resource_size_t size; 296 unsigned long ret = ~0; 297 298 spin_lock(&hose_spinlock); 299 list_for_each_entry(hose, &hose_list, list_node) { 300 size = pcibios_io_size(hose); 301 if (address >= hose->io_base_phys && 302 address < (hose->io_base_phys + size)) { 303 unsigned long base = 304 (unsigned long)hose->io_base_virt - _IO_BASE; 305 ret = base + (address - hose->io_base_phys); 306 break; 307 } 308 } 309 spin_unlock(&hose_spinlock); 310 311 return ret; 312 } 313 EXPORT_SYMBOL_GPL(pci_address_to_pio); 314 315 /* 316 * Return the domain number for this bus. 317 */ 318 int pci_domain_nr(struct pci_bus *bus) 319 { 320 struct pci_controller *hose = pci_bus_to_host(bus); 321 322 return hose->global_number; 323 } 324 EXPORT_SYMBOL(pci_domain_nr); 325 326 /* This routine is meant to be used early during boot, when the 327 * PCI bus numbers have not yet been assigned, and you need to 328 * issue PCI config cycles to an OF device. 329 * It could also be used to "fix" RTAS config cycles if you want 330 * to set pci_assign_all_buses to 1 and still use RTAS for PCI 331 * config cycles. 332 */ 333 struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node) 334 { 335 while(node) { 336 struct pci_controller *hose, *tmp; 337 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 338 if (hose->dn == node) 339 return hose; 340 node = node->parent; 341 } 342 return NULL; 343 } 344 345 struct pci_controller *pci_find_controller_for_domain(int domain_nr) 346 { 347 struct pci_controller *hose; 348 349 list_for_each_entry(hose, &hose_list, list_node) 350 if (hose->global_number == domain_nr) 351 return hose; 352 353 return NULL; 354 } 355 356 struct pci_intx_virq { 357 int virq; 358 struct kref kref; 359 struct list_head list_node; 360 }; 361 362 static LIST_HEAD(intx_list); 363 static DEFINE_MUTEX(intx_mutex); 364 365 static void ppc_pci_intx_release(struct kref *kref) 366 { 367 struct pci_intx_virq *vi = container_of(kref, struct pci_intx_virq, kref); 368 369 list_del(&vi->list_node); 370 irq_dispose_mapping(vi->virq); 371 kfree(vi); 372 } 373 374 static int ppc_pci_unmap_irq_line(struct notifier_block *nb, 375 unsigned long action, void *data) 376 { 377 struct pci_dev *pdev = to_pci_dev(data); 378 379 if (action == BUS_NOTIFY_DEL_DEVICE) { 380 struct pci_intx_virq *vi; 381 382 mutex_lock(&intx_mutex); 383 list_for_each_entry(vi, &intx_list, list_node) { 384 if (vi->virq == pdev->irq) { 385 kref_put(&vi->kref, ppc_pci_intx_release); 386 break; 387 } 388 } 389 mutex_unlock(&intx_mutex); 390 } 391 392 return NOTIFY_DONE; 393 } 394 395 static struct notifier_block ppc_pci_unmap_irq_notifier = { 396 .notifier_call = ppc_pci_unmap_irq_line, 397 }; 398 399 static int ppc_pci_register_irq_notifier(void) 400 { 401 return bus_register_notifier(&pci_bus_type, &ppc_pci_unmap_irq_notifier); 402 } 403 arch_initcall(ppc_pci_register_irq_notifier); 404 405 /* 406 * Reads the interrupt pin to determine if interrupt is use by card. 407 * If the interrupt is used, then gets the interrupt line from the 408 * openfirmware and sets it in the pci_dev and pci_config line. 409 */ 410 static int pci_read_irq_line(struct pci_dev *pci_dev) 411 { 412 int virq; 413 struct pci_intx_virq *vi, *vitmp; 414 415 /* Preallocate vi as rewind is complex if this fails after mapping */ 416 vi = kzalloc(sizeof(struct pci_intx_virq), GFP_KERNEL); 417 if (!vi) 418 return -1; 419 420 pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev)); 421 422 /* Try to get a mapping from the device-tree */ 423 virq = of_irq_parse_and_map_pci(pci_dev, 0, 0); 424 if (virq <= 0) { 425 u8 line, pin; 426 427 /* If that fails, lets fallback to what is in the config 428 * space and map that through the default controller. We 429 * also set the type to level low since that's what PCI 430 * interrupts are. If your platform does differently, then 431 * either provide a proper interrupt tree or don't use this 432 * function. 433 */ 434 if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin)) 435 goto error_exit; 436 if (pin == 0) 437 goto error_exit; 438 if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) || 439 line == 0xff || line == 0) { 440 goto error_exit; 441 } 442 pr_debug(" No map ! Using line %d (pin %d) from PCI config\n", 443 line, pin); 444 445 virq = irq_create_mapping(NULL, line); 446 if (virq) 447 irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW); 448 } 449 450 if (!virq) { 451 pr_debug(" Failed to map !\n"); 452 goto error_exit; 453 } 454 455 pr_debug(" Mapped to linux irq %d\n", virq); 456 457 pci_dev->irq = virq; 458 459 mutex_lock(&intx_mutex); 460 list_for_each_entry(vitmp, &intx_list, list_node) { 461 if (vitmp->virq == virq) { 462 kref_get(&vitmp->kref); 463 kfree(vi); 464 vi = NULL; 465 break; 466 } 467 } 468 if (vi) { 469 vi->virq = virq; 470 kref_init(&vi->kref); 471 list_add_tail(&vi->list_node, &intx_list); 472 } 473 mutex_unlock(&intx_mutex); 474 475 return 0; 476 error_exit: 477 kfree(vi); 478 return -1; 479 } 480 481 /* 482 * Platform support for /proc/bus/pci/X/Y mmap()s. 483 * -- paulus. 484 */ 485 int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma) 486 { 487 struct pci_controller *hose = pci_bus_to_host(pdev->bus); 488 resource_size_t ioaddr = pci_resource_start(pdev, bar); 489 490 if (!hose) 491 return -EINVAL; 492 493 /* Convert to an offset within this PCI controller */ 494 ioaddr -= (unsigned long)hose->io_base_virt - _IO_BASE; 495 496 vma->vm_pgoff += (ioaddr + hose->io_base_phys) >> PAGE_SHIFT; 497 return 0; 498 } 499 500 /* 501 * This one is used by /dev/mem and fbdev who have no clue about the 502 * PCI device, it tries to find the PCI device first and calls the 503 * above routine 504 */ 505 pgprot_t pci_phys_mem_access_prot(struct file *file, 506 unsigned long pfn, 507 unsigned long size, 508 pgprot_t prot) 509 { 510 struct pci_dev *pdev = NULL; 511 struct resource *found = NULL; 512 resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT; 513 int i; 514 515 if (page_is_ram(pfn)) 516 return prot; 517 518 prot = pgprot_noncached(prot); 519 for_each_pci_dev(pdev) { 520 for (i = 0; i <= PCI_ROM_RESOURCE; i++) { 521 struct resource *rp = &pdev->resource[i]; 522 int flags = rp->flags; 523 524 /* Active and same type? */ 525 if ((flags & IORESOURCE_MEM) == 0) 526 continue; 527 /* In the range of this resource? */ 528 if (offset < (rp->start & PAGE_MASK) || 529 offset > rp->end) 530 continue; 531 found = rp; 532 break; 533 } 534 if (found) 535 break; 536 } 537 if (found) { 538 if (found->flags & IORESOURCE_PREFETCH) 539 prot = pgprot_noncached_wc(prot); 540 pci_dev_put(pdev); 541 } 542 543 pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n", 544 (unsigned long long)offset, pgprot_val(prot)); 545 546 return prot; 547 } 548 549 /* This provides legacy IO read access on a bus */ 550 int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size) 551 { 552 unsigned long offset; 553 struct pci_controller *hose = pci_bus_to_host(bus); 554 struct resource *rp = &hose->io_resource; 555 void __iomem *addr; 556 557 /* Check if port can be supported by that bus. We only check 558 * the ranges of the PHB though, not the bus itself as the rules 559 * for forwarding legacy cycles down bridges are not our problem 560 * here. So if the host bridge supports it, we do it. 561 */ 562 offset = (unsigned long)hose->io_base_virt - _IO_BASE; 563 offset += port; 564 565 if (!(rp->flags & IORESOURCE_IO)) 566 return -ENXIO; 567 if (offset < rp->start || (offset + size) > rp->end) 568 return -ENXIO; 569 addr = hose->io_base_virt + port; 570 571 switch(size) { 572 case 1: 573 *((u8 *)val) = in_8(addr); 574 return 1; 575 case 2: 576 if (port & 1) 577 return -EINVAL; 578 *((u16 *)val) = in_le16(addr); 579 return 2; 580 case 4: 581 if (port & 3) 582 return -EINVAL; 583 *((u32 *)val) = in_le32(addr); 584 return 4; 585 } 586 return -EINVAL; 587 } 588 589 /* This provides legacy IO write access on a bus */ 590 int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size) 591 { 592 unsigned long offset; 593 struct pci_controller *hose = pci_bus_to_host(bus); 594 struct resource *rp = &hose->io_resource; 595 void __iomem *addr; 596 597 /* Check if port can be supported by that bus. We only check 598 * the ranges of the PHB though, not the bus itself as the rules 599 * for forwarding legacy cycles down bridges are not our problem 600 * here. So if the host bridge supports it, we do it. 601 */ 602 offset = (unsigned long)hose->io_base_virt - _IO_BASE; 603 offset += port; 604 605 if (!(rp->flags & IORESOURCE_IO)) 606 return -ENXIO; 607 if (offset < rp->start || (offset + size) > rp->end) 608 return -ENXIO; 609 addr = hose->io_base_virt + port; 610 611 /* WARNING: The generic code is idiotic. It gets passed a pointer 612 * to what can be a 1, 2 or 4 byte quantity and always reads that 613 * as a u32, which means that we have to correct the location of 614 * the data read within those 32 bits for size 1 and 2 615 */ 616 switch(size) { 617 case 1: 618 out_8(addr, val >> 24); 619 return 1; 620 case 2: 621 if (port & 1) 622 return -EINVAL; 623 out_le16(addr, val >> 16); 624 return 2; 625 case 4: 626 if (port & 3) 627 return -EINVAL; 628 out_le32(addr, val); 629 return 4; 630 } 631 return -EINVAL; 632 } 633 634 /* This provides legacy IO or memory mmap access on a bus */ 635 int pci_mmap_legacy_page_range(struct pci_bus *bus, 636 struct vm_area_struct *vma, 637 enum pci_mmap_state mmap_state) 638 { 639 struct pci_controller *hose = pci_bus_to_host(bus); 640 resource_size_t offset = 641 ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; 642 resource_size_t size = vma->vm_end - vma->vm_start; 643 struct resource *rp; 644 645 pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n", 646 pci_domain_nr(bus), bus->number, 647 mmap_state == pci_mmap_mem ? "MEM" : "IO", 648 (unsigned long long)offset, 649 (unsigned long long)(offset + size - 1)); 650 651 if (mmap_state == pci_mmap_mem) { 652 /* Hack alert ! 653 * 654 * Because X is lame and can fail starting if it gets an error trying 655 * to mmap legacy_mem (instead of just moving on without legacy memory 656 * access) we fake it here by giving it anonymous memory, effectively 657 * behaving just like /dev/zero 658 */ 659 if ((offset + size) > hose->isa_mem_size) { 660 printk(KERN_DEBUG 661 "Process %s (pid:%d) mapped non-existing PCI legacy memory for 0%04x:%02x\n", 662 current->comm, current->pid, pci_domain_nr(bus), bus->number); 663 if (vma->vm_flags & VM_SHARED) 664 return shmem_zero_setup(vma); 665 return 0; 666 } 667 offset += hose->isa_mem_phys; 668 } else { 669 unsigned long io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; 670 unsigned long roffset = offset + io_offset; 671 rp = &hose->io_resource; 672 if (!(rp->flags & IORESOURCE_IO)) 673 return -ENXIO; 674 if (roffset < rp->start || (roffset + size) > rp->end) 675 return -ENXIO; 676 offset += hose->io_base_phys; 677 } 678 pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset); 679 680 vma->vm_pgoff = offset >> PAGE_SHIFT; 681 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 682 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 683 vma->vm_end - vma->vm_start, 684 vma->vm_page_prot); 685 } 686 687 void pci_resource_to_user(const struct pci_dev *dev, int bar, 688 const struct resource *rsrc, 689 resource_size_t *start, resource_size_t *end) 690 { 691 struct pci_bus_region region; 692 693 if (rsrc->flags & IORESOURCE_IO) { 694 pcibios_resource_to_bus(dev->bus, ®ion, 695 (struct resource *) rsrc); 696 *start = region.start; 697 *end = region.end; 698 return; 699 } 700 701 /* We pass a CPU physical address to userland for MMIO instead of a 702 * BAR value because X is lame and expects to be able to use that 703 * to pass to /dev/mem! 704 * 705 * That means we may have 64-bit values where some apps only expect 706 * 32 (like X itself since it thinks only Sparc has 64-bit MMIO). 707 */ 708 *start = rsrc->start; 709 *end = rsrc->end; 710 } 711 712 /** 713 * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree 714 * @hose: newly allocated pci_controller to be setup 715 * @dev: device node of the host bridge 716 * @primary: set if primary bus (32 bits only, soon to be deprecated) 717 * 718 * This function will parse the "ranges" property of a PCI host bridge device 719 * node and setup the resource mapping of a pci controller based on its 720 * content. 721 * 722 * Life would be boring if it wasn't for a few issues that we have to deal 723 * with here: 724 * 725 * - We can only cope with one IO space range and up to 3 Memory space 726 * ranges. However, some machines (thanks Apple !) tend to split their 727 * space into lots of small contiguous ranges. So we have to coalesce. 728 * 729 * - Some busses have IO space not starting at 0, which causes trouble with 730 * the way we do our IO resource renumbering. The code somewhat deals with 731 * it for 64 bits but I would expect problems on 32 bits. 732 * 733 * - Some 32 bits platforms such as 4xx can have physical space larger than 734 * 32 bits so we need to use 64 bits values for the parsing 735 */ 736 void pci_process_bridge_OF_ranges(struct pci_controller *hose, 737 struct device_node *dev, int primary) 738 { 739 int memno = 0; 740 struct resource *res; 741 struct of_pci_range range; 742 struct of_pci_range_parser parser; 743 744 printk(KERN_INFO "PCI host bridge %pOF %s ranges:\n", 745 dev, primary ? "(primary)" : ""); 746 747 /* Check for ranges property */ 748 if (of_pci_range_parser_init(&parser, dev)) 749 return; 750 751 /* Parse it */ 752 for_each_of_pci_range(&parser, &range) { 753 /* If we failed translation or got a zero-sized region 754 * (some FW try to feed us with non sensical zero sized regions 755 * such as power3 which look like some kind of attempt at exposing 756 * the VGA memory hole) 757 */ 758 if (range.cpu_addr == OF_BAD_ADDR || range.size == 0) 759 continue; 760 761 /* Act based on address space type */ 762 res = NULL; 763 switch (range.flags & IORESOURCE_TYPE_BITS) { 764 case IORESOURCE_IO: 765 printk(KERN_INFO 766 " IO 0x%016llx..0x%016llx -> 0x%016llx\n", 767 range.cpu_addr, range.cpu_addr + range.size - 1, 768 range.pci_addr); 769 770 /* We support only one IO range */ 771 if (hose->pci_io_size) { 772 printk(KERN_INFO 773 " \\--> Skipped (too many) !\n"); 774 continue; 775 } 776 #ifdef CONFIG_PPC32 777 /* On 32 bits, limit I/O space to 16MB */ 778 if (range.size > 0x01000000) 779 range.size = 0x01000000; 780 781 /* 32 bits needs to map IOs here */ 782 hose->io_base_virt = ioremap(range.cpu_addr, 783 range.size); 784 785 /* Expect trouble if pci_addr is not 0 */ 786 if (primary) 787 isa_io_base = 788 (unsigned long)hose->io_base_virt; 789 #endif /* CONFIG_PPC32 */ 790 /* pci_io_size and io_base_phys always represent IO 791 * space starting at 0 so we factor in pci_addr 792 */ 793 hose->pci_io_size = range.pci_addr + range.size; 794 hose->io_base_phys = range.cpu_addr - range.pci_addr; 795 796 /* Build resource */ 797 res = &hose->io_resource; 798 range.cpu_addr = range.pci_addr; 799 break; 800 case IORESOURCE_MEM: 801 printk(KERN_INFO 802 " MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n", 803 range.cpu_addr, range.cpu_addr + range.size - 1, 804 range.pci_addr, 805 (range.flags & IORESOURCE_PREFETCH) ? 806 "Prefetch" : ""); 807 808 /* We support only 3 memory ranges */ 809 if (memno >= 3) { 810 printk(KERN_INFO 811 " \\--> Skipped (too many) !\n"); 812 continue; 813 } 814 /* Handles ISA memory hole space here */ 815 if (range.pci_addr == 0) { 816 if (primary || isa_mem_base == 0) 817 isa_mem_base = range.cpu_addr; 818 hose->isa_mem_phys = range.cpu_addr; 819 hose->isa_mem_size = range.size; 820 } 821 822 /* Build resource */ 823 hose->mem_offset[memno] = range.cpu_addr - 824 range.pci_addr; 825 res = &hose->mem_resources[memno++]; 826 break; 827 } 828 if (res != NULL) { 829 res->name = dev->full_name; 830 res->flags = range.flags; 831 res->start = range.cpu_addr; 832 res->end = range.cpu_addr + range.size - 1; 833 res->parent = res->child = res->sibling = NULL; 834 } 835 } 836 } 837 838 /* Decide whether to display the domain number in /proc */ 839 int pci_proc_domain(struct pci_bus *bus) 840 { 841 struct pci_controller *hose = pci_bus_to_host(bus); 842 843 if (!pci_has_flag(PCI_ENABLE_PROC_DOMAINS)) 844 return 0; 845 if (pci_has_flag(PCI_COMPAT_DOMAIN_0)) 846 return hose->global_number != 0; 847 return 1; 848 } 849 850 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) 851 { 852 if (ppc_md.pcibios_root_bridge_prepare) 853 return ppc_md.pcibios_root_bridge_prepare(bridge); 854 855 return 0; 856 } 857 858 /* This header fixup will do the resource fixup for all devices as they are 859 * probed, but not for bridge ranges 860 */ 861 static void pcibios_fixup_resources(struct pci_dev *dev) 862 { 863 struct pci_controller *hose = pci_bus_to_host(dev->bus); 864 int i; 865 866 if (!hose) { 867 printk(KERN_ERR "No host bridge for PCI dev %s !\n", 868 pci_name(dev)); 869 return; 870 } 871 872 if (dev->is_virtfn) 873 return; 874 875 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 876 struct resource *res = dev->resource + i; 877 struct pci_bus_region reg; 878 if (!res->flags) 879 continue; 880 881 /* If we're going to re-assign everything, we mark all resources 882 * as unset (and 0-base them). In addition, we mark BARs starting 883 * at 0 as unset as well, except if PCI_PROBE_ONLY is also set 884 * since in that case, we don't want to re-assign anything 885 */ 886 pcibios_resource_to_bus(dev->bus, ®, res); 887 if (pci_has_flag(PCI_REASSIGN_ALL_RSRC) || 888 (reg.start == 0 && !pci_has_flag(PCI_PROBE_ONLY))) { 889 /* Only print message if not re-assigning */ 890 if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) 891 pr_debug("PCI:%s Resource %d %pR is unassigned\n", 892 pci_name(dev), i, res); 893 res->end -= res->start; 894 res->start = 0; 895 res->flags |= IORESOURCE_UNSET; 896 continue; 897 } 898 899 pr_debug("PCI:%s Resource %d %pR\n", pci_name(dev), i, res); 900 } 901 902 /* Call machine specific resource fixup */ 903 if (ppc_md.pcibios_fixup_resources) 904 ppc_md.pcibios_fixup_resources(dev); 905 } 906 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources); 907 908 /* This function tries to figure out if a bridge resource has been initialized 909 * by the firmware or not. It doesn't have to be absolutely bullet proof, but 910 * things go more smoothly when it gets it right. It should covers cases such 911 * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges 912 */ 913 static int pcibios_uninitialized_bridge_resource(struct pci_bus *bus, 914 struct resource *res) 915 { 916 struct pci_controller *hose = pci_bus_to_host(bus); 917 struct pci_dev *dev = bus->self; 918 resource_size_t offset; 919 struct pci_bus_region region; 920 u16 command; 921 int i; 922 923 /* We don't do anything if PCI_PROBE_ONLY is set */ 924 if (pci_has_flag(PCI_PROBE_ONLY)) 925 return 0; 926 927 /* Job is a bit different between memory and IO */ 928 if (res->flags & IORESOURCE_MEM) { 929 pcibios_resource_to_bus(dev->bus, ®ion, res); 930 931 /* If the BAR is non-0 then it's probably been initialized */ 932 if (region.start != 0) 933 return 0; 934 935 /* The BAR is 0, let's check if memory decoding is enabled on 936 * the bridge. If not, we consider it unassigned 937 */ 938 pci_read_config_word(dev, PCI_COMMAND, &command); 939 if ((command & PCI_COMMAND_MEMORY) == 0) 940 return 1; 941 942 /* Memory decoding is enabled and the BAR is 0. If any of the bridge 943 * resources covers that starting address (0 then it's good enough for 944 * us for memory space) 945 */ 946 for (i = 0; i < 3; i++) { 947 if ((hose->mem_resources[i].flags & IORESOURCE_MEM) && 948 hose->mem_resources[i].start == hose->mem_offset[i]) 949 return 0; 950 } 951 952 /* Well, it starts at 0 and we know it will collide so we may as 953 * well consider it as unassigned. That covers the Apple case. 954 */ 955 return 1; 956 } else { 957 /* If the BAR is non-0, then we consider it assigned */ 958 offset = (unsigned long)hose->io_base_virt - _IO_BASE; 959 if (((res->start - offset) & 0xfffffffful) != 0) 960 return 0; 961 962 /* Here, we are a bit different than memory as typically IO space 963 * starting at low addresses -is- valid. What we do instead if that 964 * we consider as unassigned anything that doesn't have IO enabled 965 * in the PCI command register, and that's it. 966 */ 967 pci_read_config_word(dev, PCI_COMMAND, &command); 968 if (command & PCI_COMMAND_IO) 969 return 0; 970 971 /* It's starting at 0 and IO is disabled in the bridge, consider 972 * it unassigned 973 */ 974 return 1; 975 } 976 } 977 978 /* Fixup resources of a PCI<->PCI bridge */ 979 static void pcibios_fixup_bridge(struct pci_bus *bus) 980 { 981 struct resource *res; 982 int i; 983 984 struct pci_dev *dev = bus->self; 985 986 pci_bus_for_each_resource(bus, res, i) { 987 if (!res || !res->flags) 988 continue; 989 if (i >= 3 && bus->self->transparent) 990 continue; 991 992 /* If we're going to reassign everything, we can 993 * shrink the P2P resource to have size as being 994 * of 0 in order to save space. 995 */ 996 if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) { 997 res->flags |= IORESOURCE_UNSET; 998 res->start = 0; 999 res->end = -1; 1000 continue; 1001 } 1002 1003 pr_debug("PCI:%s Bus rsrc %d %pR\n", pci_name(dev), i, res); 1004 1005 /* Try to detect uninitialized P2P bridge resources, 1006 * and clear them out so they get re-assigned later 1007 */ 1008 if (pcibios_uninitialized_bridge_resource(bus, res)) { 1009 res->flags = 0; 1010 pr_debug("PCI:%s (unassigned)\n", pci_name(dev)); 1011 } 1012 } 1013 } 1014 1015 void pcibios_setup_bus_self(struct pci_bus *bus) 1016 { 1017 struct pci_controller *phb; 1018 1019 /* Fix up the bus resources for P2P bridges */ 1020 if (bus->self != NULL) 1021 pcibios_fixup_bridge(bus); 1022 1023 /* Platform specific bus fixups. This is currently only used 1024 * by fsl_pci and I'm hoping to get rid of it at some point 1025 */ 1026 if (ppc_md.pcibios_fixup_bus) 1027 ppc_md.pcibios_fixup_bus(bus); 1028 1029 /* Setup bus DMA mappings */ 1030 phb = pci_bus_to_host(bus); 1031 if (phb->controller_ops.dma_bus_setup) 1032 phb->controller_ops.dma_bus_setup(bus); 1033 } 1034 1035 void pcibios_bus_add_device(struct pci_dev *dev) 1036 { 1037 struct pci_controller *phb; 1038 /* Fixup NUMA node as it may not be setup yet by the generic 1039 * code and is needed by the DMA init 1040 */ 1041 set_dev_node(&dev->dev, pcibus_to_node(dev->bus)); 1042 1043 /* Hook up default DMA ops */ 1044 set_dma_ops(&dev->dev, pci_dma_ops); 1045 dev->dev.archdata.dma_offset = PCI_DRAM_OFFSET; 1046 1047 /* Additional platform DMA/iommu setup */ 1048 phb = pci_bus_to_host(dev->bus); 1049 if (phb->controller_ops.dma_dev_setup) 1050 phb->controller_ops.dma_dev_setup(dev); 1051 1052 /* Read default IRQs and fixup if necessary */ 1053 pci_read_irq_line(dev); 1054 if (ppc_md.pci_irq_fixup) 1055 ppc_md.pci_irq_fixup(dev); 1056 1057 if (ppc_md.pcibios_bus_add_device) 1058 ppc_md.pcibios_bus_add_device(dev); 1059 } 1060 1061 int pcibios_add_device(struct pci_dev *dev) 1062 { 1063 #ifdef CONFIG_PCI_IOV 1064 if (ppc_md.pcibios_fixup_sriov) 1065 ppc_md.pcibios_fixup_sriov(dev); 1066 #endif /* CONFIG_PCI_IOV */ 1067 1068 return 0; 1069 } 1070 1071 void pcibios_set_master(struct pci_dev *dev) 1072 { 1073 /* No special bus mastering setup handling */ 1074 } 1075 1076 void pcibios_fixup_bus(struct pci_bus *bus) 1077 { 1078 /* When called from the generic PCI probe, read PCI<->PCI bridge 1079 * bases. This is -not- called when generating the PCI tree from 1080 * the OF device-tree. 1081 */ 1082 pci_read_bridge_bases(bus); 1083 1084 /* Now fixup the bus bus */ 1085 pcibios_setup_bus_self(bus); 1086 } 1087 EXPORT_SYMBOL(pcibios_fixup_bus); 1088 1089 static int skip_isa_ioresource_align(struct pci_dev *dev) 1090 { 1091 if (pci_has_flag(PCI_CAN_SKIP_ISA_ALIGN) && 1092 !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA)) 1093 return 1; 1094 return 0; 1095 } 1096 1097 /* 1098 * We need to avoid collisions with `mirrored' VGA ports 1099 * and other strange ISA hardware, so we always want the 1100 * addresses to be allocated in the 0x000-0x0ff region 1101 * modulo 0x400. 1102 * 1103 * Why? Because some silly external IO cards only decode 1104 * the low 10 bits of the IO address. The 0x00-0xff region 1105 * is reserved for motherboard devices that decode all 16 1106 * bits, so it's ok to allocate at, say, 0x2800-0x28ff, 1107 * but we want to try to avoid allocating at 0x2900-0x2bff 1108 * which might have be mirrored at 0x0100-0x03ff.. 1109 */ 1110 resource_size_t pcibios_align_resource(void *data, const struct resource *res, 1111 resource_size_t size, resource_size_t align) 1112 { 1113 struct pci_dev *dev = data; 1114 resource_size_t start = res->start; 1115 1116 if (res->flags & IORESOURCE_IO) { 1117 if (skip_isa_ioresource_align(dev)) 1118 return start; 1119 if (start & 0x300) 1120 start = (start + 0x3ff) & ~0x3ff; 1121 } 1122 1123 return start; 1124 } 1125 EXPORT_SYMBOL(pcibios_align_resource); 1126 1127 /* 1128 * Reparent resource children of pr that conflict with res 1129 * under res, and make res replace those children. 1130 */ 1131 static int reparent_resources(struct resource *parent, 1132 struct resource *res) 1133 { 1134 struct resource *p, **pp; 1135 struct resource **firstpp = NULL; 1136 1137 for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) { 1138 if (p->end < res->start) 1139 continue; 1140 if (res->end < p->start) 1141 break; 1142 if (p->start < res->start || p->end > res->end) 1143 return -1; /* not completely contained */ 1144 if (firstpp == NULL) 1145 firstpp = pp; 1146 } 1147 if (firstpp == NULL) 1148 return -1; /* didn't find any conflicting entries? */ 1149 res->parent = parent; 1150 res->child = *firstpp; 1151 res->sibling = *pp; 1152 *firstpp = res; 1153 *pp = NULL; 1154 for (p = res->child; p != NULL; p = p->sibling) { 1155 p->parent = res; 1156 pr_debug("PCI: Reparented %s %pR under %s\n", 1157 p->name, p, res->name); 1158 } 1159 return 0; 1160 } 1161 1162 /* 1163 * Handle resources of PCI devices. If the world were perfect, we could 1164 * just allocate all the resource regions and do nothing more. It isn't. 1165 * On the other hand, we cannot just re-allocate all devices, as it would 1166 * require us to know lots of host bridge internals. So we attempt to 1167 * keep as much of the original configuration as possible, but tweak it 1168 * when it's found to be wrong. 1169 * 1170 * Known BIOS problems we have to work around: 1171 * - I/O or memory regions not configured 1172 * - regions configured, but not enabled in the command register 1173 * - bogus I/O addresses above 64K used 1174 * - expansion ROMs left enabled (this may sound harmless, but given 1175 * the fact the PCI specs explicitly allow address decoders to be 1176 * shared between expansion ROMs and other resource regions, it's 1177 * at least dangerous) 1178 * 1179 * Our solution: 1180 * (1) Allocate resources for all buses behind PCI-to-PCI bridges. 1181 * This gives us fixed barriers on where we can allocate. 1182 * (2) Allocate resources for all enabled devices. If there is 1183 * a collision, just mark the resource as unallocated. Also 1184 * disable expansion ROMs during this step. 1185 * (3) Try to allocate resources for disabled devices. If the 1186 * resources were assigned correctly, everything goes well, 1187 * if they weren't, they won't disturb allocation of other 1188 * resources. 1189 * (4) Assign new addresses to resources which were either 1190 * not configured at all or misconfigured. If explicitly 1191 * requested by the user, configure expansion ROM address 1192 * as well. 1193 */ 1194 1195 static void pcibios_allocate_bus_resources(struct pci_bus *bus) 1196 { 1197 struct pci_bus *b; 1198 int i; 1199 struct resource *res, *pr; 1200 1201 pr_debug("PCI: Allocating bus resources for %04x:%02x...\n", 1202 pci_domain_nr(bus), bus->number); 1203 1204 pci_bus_for_each_resource(bus, res, i) { 1205 if (!res || !res->flags || res->start > res->end || res->parent) 1206 continue; 1207 1208 /* If the resource was left unset at this point, we clear it */ 1209 if (res->flags & IORESOURCE_UNSET) 1210 goto clear_resource; 1211 1212 if (bus->parent == NULL) 1213 pr = (res->flags & IORESOURCE_IO) ? 1214 &ioport_resource : &iomem_resource; 1215 else { 1216 pr = pci_find_parent_resource(bus->self, res); 1217 if (pr == res) { 1218 /* this happens when the generic PCI 1219 * code (wrongly) decides that this 1220 * bridge is transparent -- paulus 1221 */ 1222 continue; 1223 } 1224 } 1225 1226 pr_debug("PCI: %s (bus %d) bridge rsrc %d: %pR, parent %p (%s)\n", 1227 bus->self ? pci_name(bus->self) : "PHB", bus->number, 1228 i, res, pr, (pr && pr->name) ? pr->name : "nil"); 1229 1230 if (pr && !(pr->flags & IORESOURCE_UNSET)) { 1231 struct pci_dev *dev = bus->self; 1232 1233 if (request_resource(pr, res) == 0) 1234 continue; 1235 /* 1236 * Must be a conflict with an existing entry. 1237 * Move that entry (or entries) under the 1238 * bridge resource and try again. 1239 */ 1240 if (reparent_resources(pr, res) == 0) 1241 continue; 1242 1243 if (dev && i < PCI_BRIDGE_RESOURCE_NUM && 1244 pci_claim_bridge_resource(dev, 1245 i + PCI_BRIDGE_RESOURCES) == 0) 1246 continue; 1247 } 1248 pr_warn("PCI: Cannot allocate resource region %d of PCI bridge %d, will remap\n", 1249 i, bus->number); 1250 clear_resource: 1251 /* The resource might be figured out when doing 1252 * reassignment based on the resources required 1253 * by the downstream PCI devices. Here we set 1254 * the size of the resource to be 0 in order to 1255 * save more space. 1256 */ 1257 res->start = 0; 1258 res->end = -1; 1259 res->flags = 0; 1260 } 1261 1262 list_for_each_entry(b, &bus->children, node) 1263 pcibios_allocate_bus_resources(b); 1264 } 1265 1266 static inline void alloc_resource(struct pci_dev *dev, int idx) 1267 { 1268 struct resource *pr, *r = &dev->resource[idx]; 1269 1270 pr_debug("PCI: Allocating %s: Resource %d: %pR\n", 1271 pci_name(dev), idx, r); 1272 1273 pr = pci_find_parent_resource(dev, r); 1274 if (!pr || (pr->flags & IORESOURCE_UNSET) || 1275 request_resource(pr, r) < 0) { 1276 printk(KERN_WARNING "PCI: Cannot allocate resource region %d" 1277 " of device %s, will remap\n", idx, pci_name(dev)); 1278 if (pr) 1279 pr_debug("PCI: parent is %p: %pR\n", pr, pr); 1280 /* We'll assign a new address later */ 1281 r->flags |= IORESOURCE_UNSET; 1282 r->end -= r->start; 1283 r->start = 0; 1284 } 1285 } 1286 1287 static void __init pcibios_allocate_resources(int pass) 1288 { 1289 struct pci_dev *dev = NULL; 1290 int idx, disabled; 1291 u16 command; 1292 struct resource *r; 1293 1294 for_each_pci_dev(dev) { 1295 pci_read_config_word(dev, PCI_COMMAND, &command); 1296 for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) { 1297 r = &dev->resource[idx]; 1298 if (r->parent) /* Already allocated */ 1299 continue; 1300 if (!r->flags || (r->flags & IORESOURCE_UNSET)) 1301 continue; /* Not assigned at all */ 1302 /* We only allocate ROMs on pass 1 just in case they 1303 * have been screwed up by firmware 1304 */ 1305 if (idx == PCI_ROM_RESOURCE ) 1306 disabled = 1; 1307 if (r->flags & IORESOURCE_IO) 1308 disabled = !(command & PCI_COMMAND_IO); 1309 else 1310 disabled = !(command & PCI_COMMAND_MEMORY); 1311 if (pass == disabled) 1312 alloc_resource(dev, idx); 1313 } 1314 if (pass) 1315 continue; 1316 r = &dev->resource[PCI_ROM_RESOURCE]; 1317 if (r->flags) { 1318 /* Turn the ROM off, leave the resource region, 1319 * but keep it unregistered. 1320 */ 1321 u32 reg; 1322 pci_read_config_dword(dev, dev->rom_base_reg, ®); 1323 if (reg & PCI_ROM_ADDRESS_ENABLE) { 1324 pr_debug("PCI: Switching off ROM of %s\n", 1325 pci_name(dev)); 1326 r->flags &= ~IORESOURCE_ROM_ENABLE; 1327 pci_write_config_dword(dev, dev->rom_base_reg, 1328 reg & ~PCI_ROM_ADDRESS_ENABLE); 1329 } 1330 } 1331 } 1332 } 1333 1334 static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus) 1335 { 1336 struct pci_controller *hose = pci_bus_to_host(bus); 1337 resource_size_t offset; 1338 struct resource *res, *pres; 1339 int i; 1340 1341 pr_debug("Reserving legacy ranges for domain %04x\n", pci_domain_nr(bus)); 1342 1343 /* Check for IO */ 1344 if (!(hose->io_resource.flags & IORESOURCE_IO)) 1345 goto no_io; 1346 offset = (unsigned long)hose->io_base_virt - _IO_BASE; 1347 res = kzalloc(sizeof(struct resource), GFP_KERNEL); 1348 BUG_ON(res == NULL); 1349 res->name = "Legacy IO"; 1350 res->flags = IORESOURCE_IO; 1351 res->start = offset; 1352 res->end = (offset + 0xfff) & 0xfffffffful; 1353 pr_debug("Candidate legacy IO: %pR\n", res); 1354 if (request_resource(&hose->io_resource, res)) { 1355 printk(KERN_DEBUG 1356 "PCI %04x:%02x Cannot reserve Legacy IO %pR\n", 1357 pci_domain_nr(bus), bus->number, res); 1358 kfree(res); 1359 } 1360 1361 no_io: 1362 /* Check for memory */ 1363 for (i = 0; i < 3; i++) { 1364 pres = &hose->mem_resources[i]; 1365 offset = hose->mem_offset[i]; 1366 if (!(pres->flags & IORESOURCE_MEM)) 1367 continue; 1368 pr_debug("hose mem res: %pR\n", pres); 1369 if ((pres->start - offset) <= 0xa0000 && 1370 (pres->end - offset) >= 0xbffff) 1371 break; 1372 } 1373 if (i >= 3) 1374 return; 1375 res = kzalloc(sizeof(struct resource), GFP_KERNEL); 1376 BUG_ON(res == NULL); 1377 res->name = "Legacy VGA memory"; 1378 res->flags = IORESOURCE_MEM; 1379 res->start = 0xa0000 + offset; 1380 res->end = 0xbffff + offset; 1381 pr_debug("Candidate VGA memory: %pR\n", res); 1382 if (request_resource(pres, res)) { 1383 printk(KERN_DEBUG 1384 "PCI %04x:%02x Cannot reserve VGA memory %pR\n", 1385 pci_domain_nr(bus), bus->number, res); 1386 kfree(res); 1387 } 1388 } 1389 1390 void __init pcibios_resource_survey(void) 1391 { 1392 struct pci_bus *b; 1393 1394 /* Allocate and assign resources */ 1395 list_for_each_entry(b, &pci_root_buses, node) 1396 pcibios_allocate_bus_resources(b); 1397 if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) { 1398 pcibios_allocate_resources(0); 1399 pcibios_allocate_resources(1); 1400 } 1401 1402 /* Before we start assigning unassigned resource, we try to reserve 1403 * the low IO area and the VGA memory area if they intersect the 1404 * bus available resources to avoid allocating things on top of them 1405 */ 1406 if (!pci_has_flag(PCI_PROBE_ONLY)) { 1407 list_for_each_entry(b, &pci_root_buses, node) 1408 pcibios_reserve_legacy_regions(b); 1409 } 1410 1411 /* Now, if the platform didn't decide to blindly trust the firmware, 1412 * we proceed to assigning things that were left unassigned 1413 */ 1414 if (!pci_has_flag(PCI_PROBE_ONLY)) { 1415 pr_debug("PCI: Assigning unassigned resources...\n"); 1416 pci_assign_unassigned_resources(); 1417 } 1418 } 1419 1420 /* This is used by the PCI hotplug driver to allocate resource 1421 * of newly plugged busses. We can try to consolidate with the 1422 * rest of the code later, for now, keep it as-is as our main 1423 * resource allocation function doesn't deal with sub-trees yet. 1424 */ 1425 void pcibios_claim_one_bus(struct pci_bus *bus) 1426 { 1427 struct pci_dev *dev; 1428 struct pci_bus *child_bus; 1429 1430 list_for_each_entry(dev, &bus->devices, bus_list) { 1431 int i; 1432 1433 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 1434 struct resource *r = &dev->resource[i]; 1435 1436 if (r->parent || !r->start || !r->flags) 1437 continue; 1438 1439 pr_debug("PCI: Claiming %s: Resource %d: %pR\n", 1440 pci_name(dev), i, r); 1441 1442 if (pci_claim_resource(dev, i) == 0) 1443 continue; 1444 1445 pci_claim_bridge_resource(dev, i); 1446 } 1447 } 1448 1449 list_for_each_entry(child_bus, &bus->children, node) 1450 pcibios_claim_one_bus(child_bus); 1451 } 1452 EXPORT_SYMBOL_GPL(pcibios_claim_one_bus); 1453 1454 1455 /* pcibios_finish_adding_to_bus 1456 * 1457 * This is to be called by the hotplug code after devices have been 1458 * added to a bus, this include calling it for a PHB that is just 1459 * being added 1460 */ 1461 void pcibios_finish_adding_to_bus(struct pci_bus *bus) 1462 { 1463 pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n", 1464 pci_domain_nr(bus), bus->number); 1465 1466 /* Allocate bus and devices resources */ 1467 pcibios_allocate_bus_resources(bus); 1468 pcibios_claim_one_bus(bus); 1469 if (!pci_has_flag(PCI_PROBE_ONLY)) { 1470 if (bus->self) 1471 pci_assign_unassigned_bridge_resources(bus->self); 1472 else 1473 pci_assign_unassigned_bus_resources(bus); 1474 } 1475 1476 /* Add new devices to global lists. Register in proc, sysfs. */ 1477 pci_bus_add_devices(bus); 1478 } 1479 EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus); 1480 1481 int pcibios_enable_device(struct pci_dev *dev, int mask) 1482 { 1483 struct pci_controller *phb = pci_bus_to_host(dev->bus); 1484 1485 if (phb->controller_ops.enable_device_hook) 1486 if (!phb->controller_ops.enable_device_hook(dev)) 1487 return -EINVAL; 1488 1489 return pci_enable_resources(dev, mask); 1490 } 1491 1492 void pcibios_disable_device(struct pci_dev *dev) 1493 { 1494 struct pci_controller *phb = pci_bus_to_host(dev->bus); 1495 1496 if (phb->controller_ops.disable_device) 1497 phb->controller_ops.disable_device(dev); 1498 } 1499 1500 resource_size_t pcibios_io_space_offset(struct pci_controller *hose) 1501 { 1502 return (unsigned long) hose->io_base_virt - _IO_BASE; 1503 } 1504 1505 static void pcibios_setup_phb_resources(struct pci_controller *hose, 1506 struct list_head *resources) 1507 { 1508 struct resource *res; 1509 resource_size_t offset; 1510 int i; 1511 1512 /* Hookup PHB IO resource */ 1513 res = &hose->io_resource; 1514 1515 if (!res->flags) { 1516 pr_debug("PCI: I/O resource not set for host" 1517 " bridge %pOF (domain %d)\n", 1518 hose->dn, hose->global_number); 1519 } else { 1520 offset = pcibios_io_space_offset(hose); 1521 1522 pr_debug("PCI: PHB IO resource = %pR off 0x%08llx\n", 1523 res, (unsigned long long)offset); 1524 pci_add_resource_offset(resources, res, offset); 1525 } 1526 1527 /* Hookup PHB Memory resources */ 1528 for (i = 0; i < 3; ++i) { 1529 res = &hose->mem_resources[i]; 1530 if (!res->flags) 1531 continue; 1532 1533 offset = hose->mem_offset[i]; 1534 pr_debug("PCI: PHB MEM resource %d = %pR off 0x%08llx\n", i, 1535 res, (unsigned long long)offset); 1536 1537 pci_add_resource_offset(resources, res, offset); 1538 } 1539 } 1540 1541 /* 1542 * Null PCI config access functions, for the case when we can't 1543 * find a hose. 1544 */ 1545 #define NULL_PCI_OP(rw, size, type) \ 1546 static int \ 1547 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \ 1548 { \ 1549 return PCIBIOS_DEVICE_NOT_FOUND; \ 1550 } 1551 1552 static int 1553 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset, 1554 int len, u32 *val) 1555 { 1556 return PCIBIOS_DEVICE_NOT_FOUND; 1557 } 1558 1559 static int 1560 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset, 1561 int len, u32 val) 1562 { 1563 return PCIBIOS_DEVICE_NOT_FOUND; 1564 } 1565 1566 static struct pci_ops null_pci_ops = 1567 { 1568 .read = null_read_config, 1569 .write = null_write_config, 1570 }; 1571 1572 /* 1573 * These functions are used early on before PCI scanning is done 1574 * and all of the pci_dev and pci_bus structures have been created. 1575 */ 1576 static struct pci_bus * 1577 fake_pci_bus(struct pci_controller *hose, int busnr) 1578 { 1579 static struct pci_bus bus; 1580 1581 if (hose == NULL) { 1582 printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr); 1583 } 1584 bus.number = busnr; 1585 bus.sysdata = hose; 1586 bus.ops = hose? hose->ops: &null_pci_ops; 1587 return &bus; 1588 } 1589 1590 #define EARLY_PCI_OP(rw, size, type) \ 1591 int early_##rw##_config_##size(struct pci_controller *hose, int bus, \ 1592 int devfn, int offset, type value) \ 1593 { \ 1594 return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \ 1595 devfn, offset, value); \ 1596 } 1597 1598 EARLY_PCI_OP(read, byte, u8 *) 1599 EARLY_PCI_OP(read, word, u16 *) 1600 EARLY_PCI_OP(read, dword, u32 *) 1601 EARLY_PCI_OP(write, byte, u8) 1602 EARLY_PCI_OP(write, word, u16) 1603 EARLY_PCI_OP(write, dword, u32) 1604 1605 int early_find_capability(struct pci_controller *hose, int bus, int devfn, 1606 int cap) 1607 { 1608 return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap); 1609 } 1610 1611 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) 1612 { 1613 struct pci_controller *hose = bus->sysdata; 1614 1615 return of_node_get(hose->dn); 1616 } 1617 1618 /** 1619 * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus 1620 * @hose: Pointer to the PCI host controller instance structure 1621 */ 1622 void pcibios_scan_phb(struct pci_controller *hose) 1623 { 1624 LIST_HEAD(resources); 1625 struct pci_bus *bus; 1626 struct device_node *node = hose->dn; 1627 int mode; 1628 1629 pr_debug("PCI: Scanning PHB %pOF\n", node); 1630 1631 /* Get some IO space for the new PHB */ 1632 pcibios_setup_phb_io_space(hose); 1633 1634 /* Wire up PHB bus resources */ 1635 pcibios_setup_phb_resources(hose, &resources); 1636 1637 hose->busn.start = hose->first_busno; 1638 hose->busn.end = hose->last_busno; 1639 hose->busn.flags = IORESOURCE_BUS; 1640 pci_add_resource(&resources, &hose->busn); 1641 1642 /* Create an empty bus for the toplevel */ 1643 bus = pci_create_root_bus(hose->parent, hose->first_busno, 1644 hose->ops, hose, &resources); 1645 if (bus == NULL) { 1646 pr_err("Failed to create bus for PCI domain %04x\n", 1647 hose->global_number); 1648 pci_free_resource_list(&resources); 1649 return; 1650 } 1651 hose->bus = bus; 1652 1653 /* Get probe mode and perform scan */ 1654 mode = PCI_PROBE_NORMAL; 1655 if (node && hose->controller_ops.probe_mode) 1656 mode = hose->controller_ops.probe_mode(bus); 1657 pr_debug(" probe mode: %d\n", mode); 1658 if (mode == PCI_PROBE_DEVTREE) 1659 of_scan_bus(node, bus); 1660 1661 if (mode == PCI_PROBE_NORMAL) { 1662 pci_bus_update_busn_res_end(bus, 255); 1663 hose->last_busno = pci_scan_child_bus(bus); 1664 pci_bus_update_busn_res_end(bus, hose->last_busno); 1665 } 1666 1667 /* Platform gets a chance to do some global fixups before 1668 * we proceed to resource allocation 1669 */ 1670 if (ppc_md.pcibios_fixup_phb) 1671 ppc_md.pcibios_fixup_phb(hose); 1672 1673 /* Configure PCI Express settings */ 1674 if (bus && !pci_has_flag(PCI_PROBE_ONLY)) { 1675 struct pci_bus *child; 1676 list_for_each_entry(child, &bus->children, node) 1677 pcie_bus_configure_settings(child); 1678 } 1679 } 1680 EXPORT_SYMBOL_GPL(pcibios_scan_phb); 1681 1682 static void fixup_hide_host_resource_fsl(struct pci_dev *dev) 1683 { 1684 int i, class = dev->class >> 8; 1685 /* When configured as agent, programing interface = 1 */ 1686 int prog_if = dev->class & 0xf; 1687 1688 if ((class == PCI_CLASS_PROCESSOR_POWERPC || 1689 class == PCI_CLASS_BRIDGE_OTHER) && 1690 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) && 1691 (prog_if == 0) && 1692 (dev->bus->parent == NULL)) { 1693 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 1694 dev->resource[i].start = 0; 1695 dev->resource[i].end = 0; 1696 dev->resource[i].flags = 0; 1697 } 1698 } 1699 } 1700 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl); 1701 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl); 1702 1703 1704 static int __init discover_phbs(void) 1705 { 1706 if (ppc_md.discover_phbs) 1707 ppc_md.discover_phbs(); 1708 1709 return 0; 1710 } 1711 core_initcall(discover_phbs); 1712