2 * Contains common pci routines for ALL ppc platform
3 * (based on pci_32.c and pci_64.c)
5 * Port for PPC64 David Engebretsen, IBM Corp.
6 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
8 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
9 * Rework, based on alpha PCI code.
11 * Common pmac/prep/chrp pci routines. -- Cort
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.
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>
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>
35 #include <asm/processor.h>
38 #include <asm/pci-bridge.h>
39 #include <asm/byteorder.h>
40 #include <asm/machdep.h>
41 #include <asm/ppc-pci.h>
44 /* hose_spinlock protects accesses to the the phb_bitmap. */
45 static DEFINE_SPINLOCK(hose_spinlock);
48 /* For dynamic PHB numbering on get_phb_number(): max number of PHBs. */
49 #define MAX_PHBS 0x10000
52 * For dynamic PHB numbering: used/free PHBs tracking bitmap.
53 * Accesses to this bitmap should be protected by hose_spinlock.
55 static DECLARE_BITMAP(phb_bitmap, MAX_PHBS);
57 /* ISA Memory physical address */
58 resource_size_t isa_mem_base;
61 static struct dma_map_ops *pci_dma_ops = &dma_direct_ops;
63 void set_pci_dma_ops(struct dma_map_ops *dma_ops)
65 pci_dma_ops = dma_ops;
68 struct dma_map_ops *get_pci_dma_ops(void)
72 EXPORT_SYMBOL(get_pci_dma_ops);
75 * This function should run under locking protection, specifically
78 static int get_phb_number(struct device_node *dn)
85 * Try fixed PHB numbering first, by checking archs and reading
86 * the respective device-tree properties. Firstly, try powernv by
87 * reading "ibm,opal-phbid", only present in OPAL environment.
89 ret = of_property_read_u64(dn, "ibm,opal-phbid", &prop);
91 ret = of_property_read_u32_index(dn, "reg", 1, &prop_32);
96 phb_id = (int)(prop & (MAX_PHBS - 1));
98 /* We need to be sure to not use the same PHB number twice. */
99 if ((phb_id >= 0) && !test_and_set_bit(phb_id, phb_bitmap))
103 * If not pseries nor powernv, or if fixed PHB numbering tried to add
104 * the same PHB number twice, then fallback to dynamic PHB numbering.
106 phb_id = find_first_zero_bit(phb_bitmap, MAX_PHBS);
107 BUG_ON(phb_id >= MAX_PHBS);
108 set_bit(phb_id, phb_bitmap);
113 struct pci_controller *pcibios_alloc_controller(struct device_node *dev)
115 struct pci_controller *phb;
117 phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL);
120 spin_lock(&hose_spinlock);
121 phb->global_number = get_phb_number(dev);
122 list_add_tail(&phb->list_node, &hose_list);
123 spin_unlock(&hose_spinlock);
125 phb->is_dynamic = slab_is_available();
128 int nid = of_node_to_nid(dev);
130 if (nid < 0 || !node_online(nid))
133 PHB_SET_NODE(phb, nid);
138 EXPORT_SYMBOL_GPL(pcibios_alloc_controller);
140 void pcibios_free_controller(struct pci_controller *phb)
142 spin_lock(&hose_spinlock);
144 /* Clear bit of phb_bitmap to allow reuse of this PHB number. */
145 if (phb->global_number < MAX_PHBS)
146 clear_bit(phb->global_number, phb_bitmap);
148 list_del(&phb->list_node);
149 spin_unlock(&hose_spinlock);
154 EXPORT_SYMBOL_GPL(pcibios_free_controller);
157 * This function is used to call pcibios_free_controller()
158 * in a deferred manner: a callback from the PCI subsystem.
160 * _*DO NOT*_ call pcibios_free_controller() explicitly if
161 * this is used (or it may access an invalid *phb pointer).
163 * The callback occurs when all references to the root bus
164 * are dropped (e.g., child buses/devices and their users).
166 * It's called as .release_fn() of 'struct pci_host_bridge'
167 * which is associated with the 'struct pci_controller.bus'
168 * (root bus) - it expects .release_data to hold a pointer
169 * to 'struct pci_controller'.
171 * In order to use it, register .release_fn()/release_data
174 * pci_set_host_bridge_release(bridge,
175 * pcibios_free_controller_deferred
178 * e.g. in the pcibios_root_bridge_prepare() callback from
179 * pci_create_root_bus().
181 void pcibios_free_controller_deferred(struct pci_host_bridge *bridge)
183 struct pci_controller *phb = (struct pci_controller *)
184 bridge->release_data;
186 pr_debug("domain %d, dynamic %d\n", phb->global_number, phb->is_dynamic);
188 pcibios_free_controller(phb);
190 EXPORT_SYMBOL_GPL(pcibios_free_controller_deferred);
193 * The function is used to return the minimal alignment
194 * for memory or I/O windows of the associated P2P bridge.
195 * By default, 4KiB alignment for I/O windows and 1MiB for
198 resource_size_t pcibios_window_alignment(struct pci_bus *bus,
201 struct pci_controller *phb = pci_bus_to_host(bus);
203 if (phb->controller_ops.window_alignment)
204 return phb->controller_ops.window_alignment(bus, type);
207 * PCI core will figure out the default
208 * alignment: 4KiB for I/O and 1MiB for
214 void pcibios_setup_bridge(struct pci_bus *bus, unsigned long type)
216 struct pci_controller *hose = pci_bus_to_host(bus);
218 if (hose->controller_ops.setup_bridge)
219 hose->controller_ops.setup_bridge(bus, type);
222 void pcibios_reset_secondary_bus(struct pci_dev *dev)
224 struct pci_controller *phb = pci_bus_to_host(dev->bus);
226 if (phb->controller_ops.reset_secondary_bus) {
227 phb->controller_ops.reset_secondary_bus(dev);
231 pci_reset_secondary_bus(dev);
234 #ifdef CONFIG_PCI_IOV
235 resource_size_t pcibios_iov_resource_alignment(struct pci_dev *pdev, int resno)
237 if (ppc_md.pcibios_iov_resource_alignment)
238 return ppc_md.pcibios_iov_resource_alignment(pdev, resno);
240 return pci_iov_resource_size(pdev, resno);
242 #endif /* CONFIG_PCI_IOV */
244 static resource_size_t pcibios_io_size(const struct pci_controller *hose)
247 return hose->pci_io_size;
249 return resource_size(&hose->io_resource);
253 int pcibios_vaddr_is_ioport(void __iomem *address)
256 struct pci_controller *hose;
257 resource_size_t size;
259 spin_lock(&hose_spinlock);
260 list_for_each_entry(hose, &hose_list, list_node) {
261 size = pcibios_io_size(hose);
262 if (address >= hose->io_base_virt &&
263 address < (hose->io_base_virt + size)) {
268 spin_unlock(&hose_spinlock);
272 unsigned long pci_address_to_pio(phys_addr_t address)
274 struct pci_controller *hose;
275 resource_size_t size;
276 unsigned long ret = ~0;
278 spin_lock(&hose_spinlock);
279 list_for_each_entry(hose, &hose_list, list_node) {
280 size = pcibios_io_size(hose);
281 if (address >= hose->io_base_phys &&
282 address < (hose->io_base_phys + size)) {
284 (unsigned long)hose->io_base_virt - _IO_BASE;
285 ret = base + (address - hose->io_base_phys);
289 spin_unlock(&hose_spinlock);
293 EXPORT_SYMBOL_GPL(pci_address_to_pio);
296 * Return the domain number for this bus.
298 int pci_domain_nr(struct pci_bus *bus)
300 struct pci_controller *hose = pci_bus_to_host(bus);
302 return hose->global_number;
304 EXPORT_SYMBOL(pci_domain_nr);
306 /* This routine is meant to be used early during boot, when the
307 * PCI bus numbers have not yet been assigned, and you need to
308 * issue PCI config cycles to an OF device.
309 * It could also be used to "fix" RTAS config cycles if you want
310 * to set pci_assign_all_buses to 1 and still use RTAS for PCI
313 struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
316 struct pci_controller *hose, *tmp;
317 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
318 if (hose->dn == node)
326 * Reads the interrupt pin to determine if interrupt is use by card.
327 * If the interrupt is used, then gets the interrupt line from the
328 * openfirmware and sets it in the pci_dev and pci_config line.
330 static int pci_read_irq_line(struct pci_dev *pci_dev)
332 struct of_phandle_args oirq;
335 pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev));
338 memset(&oirq, 0xff, sizeof(oirq));
340 /* Try to get a mapping from the device-tree */
341 if (of_irq_parse_pci(pci_dev, &oirq)) {
344 /* If that fails, lets fallback to what is in the config
345 * space and map that through the default controller. We
346 * also set the type to level low since that's what PCI
347 * interrupts are. If your platform does differently, then
348 * either provide a proper interrupt tree or don't use this
351 if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin))
355 if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) ||
356 line == 0xff || line == 0) {
359 pr_debug(" No map ! Using line %d (pin %d) from PCI config\n",
362 virq = irq_create_mapping(NULL, line);
364 irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
366 pr_debug(" Got one, spec %d cells (0x%08x 0x%08x...) on %s\n",
367 oirq.args_count, oirq.args[0], oirq.args[1],
368 of_node_full_name(oirq.np));
370 virq = irq_create_of_mapping(&oirq);
374 pr_debug(" Failed to map !\n");
378 pr_debug(" Mapped to linux irq %d\n", virq);
386 * Platform support for /proc/bus/pci/X/Y mmap()s,
387 * modelled on the sparc64 implementation by Dave Miller.
392 * Adjust vm_pgoff of VMA such that it is the physical page offset
393 * corresponding to the 32-bit pci bus offset for DEV requested by the user.
395 * Basically, the user finds the base address for his device which he wishes
396 * to mmap. They read the 32-bit value from the config space base register,
397 * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
398 * offset parameter of mmap on /proc/bus/pci/XXX for that device.
400 * Returns negative error code on failure, zero on success.
402 static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
403 resource_size_t *offset,
404 enum pci_mmap_state mmap_state)
406 struct pci_controller *hose = pci_bus_to_host(dev->bus);
407 unsigned long io_offset = 0;
411 return NULL; /* should never happen */
413 /* If memory, add on the PCI bridge address offset */
414 if (mmap_state == pci_mmap_mem) {
415 #if 0 /* See comment in pci_resource_to_user() for why this is disabled */
416 *offset += hose->pci_mem_offset;
418 res_bit = IORESOURCE_MEM;
420 io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
421 *offset += io_offset;
422 res_bit = IORESOURCE_IO;
426 * Check that the offset requested corresponds to one of the
427 * resources of the device.
429 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
430 struct resource *rp = &dev->resource[i];
431 int flags = rp->flags;
433 /* treat ROM as memory (should be already) */
434 if (i == PCI_ROM_RESOURCE)
435 flags |= IORESOURCE_MEM;
437 /* Active and same type? */
438 if ((flags & res_bit) == 0)
441 /* In the range of this resource? */
442 if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end)
445 /* found it! construct the final physical address */
446 if (mmap_state == pci_mmap_io)
447 *offset += hose->io_base_phys - io_offset;
455 * This one is used by /dev/mem and fbdev who have no clue about the
456 * PCI device, it tries to find the PCI device first and calls the
459 pgprot_t pci_phys_mem_access_prot(struct file *file,
464 struct pci_dev *pdev = NULL;
465 struct resource *found = NULL;
466 resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT;
469 if (page_is_ram(pfn))
472 prot = pgprot_noncached(prot);
473 for_each_pci_dev(pdev) {
474 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
475 struct resource *rp = &pdev->resource[i];
476 int flags = rp->flags;
478 /* Active and same type? */
479 if ((flags & IORESOURCE_MEM) == 0)
481 /* In the range of this resource? */
482 if (offset < (rp->start & PAGE_MASK) ||
492 if (found->flags & IORESOURCE_PREFETCH)
493 prot = pgprot_noncached_wc(prot);
497 pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n",
498 (unsigned long long)offset, pgprot_val(prot));
505 * Perform the actual remap of the pages for a PCI device mapping, as
506 * appropriate for this architecture. The region in the process to map
507 * is described by vm_start and vm_end members of VMA, the base physical
508 * address is found in vm_pgoff.
509 * The pci device structure is provided so that architectures may make mapping
510 * decisions on a per-device or per-bus basis.
512 * Returns a negative error code on failure, zero on success.
514 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
515 enum pci_mmap_state mmap_state, int write_combine)
517 resource_size_t offset =
518 ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT;
522 rp = __pci_mmap_make_offset(dev, &offset, mmap_state);
526 vma->vm_pgoff = offset >> PAGE_SHIFT;
528 vma->vm_page_prot = pgprot_noncached_wc(vma->vm_page_prot);
530 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
532 ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
533 vma->vm_end - vma->vm_start, vma->vm_page_prot);
538 /* This provides legacy IO read access on a bus */
539 int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
541 unsigned long offset;
542 struct pci_controller *hose = pci_bus_to_host(bus);
543 struct resource *rp = &hose->io_resource;
546 /* Check if port can be supported by that bus. We only check
547 * the ranges of the PHB though, not the bus itself as the rules
548 * for forwarding legacy cycles down bridges are not our problem
549 * here. So if the host bridge supports it, we do it.
551 offset = (unsigned long)hose->io_base_virt - _IO_BASE;
554 if (!(rp->flags & IORESOURCE_IO))
556 if (offset < rp->start || (offset + size) > rp->end)
558 addr = hose->io_base_virt + port;
562 *((u8 *)val) = in_8(addr);
567 *((u16 *)val) = in_le16(addr);
572 *((u32 *)val) = in_le32(addr);
578 /* This provides legacy IO write access on a bus */
579 int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
581 unsigned long offset;
582 struct pci_controller *hose = pci_bus_to_host(bus);
583 struct resource *rp = &hose->io_resource;
586 /* Check if port can be supported by that bus. We only check
587 * the ranges of the PHB though, not the bus itself as the rules
588 * for forwarding legacy cycles down bridges are not our problem
589 * here. So if the host bridge supports it, we do it.
591 offset = (unsigned long)hose->io_base_virt - _IO_BASE;
594 if (!(rp->flags & IORESOURCE_IO))
596 if (offset < rp->start || (offset + size) > rp->end)
598 addr = hose->io_base_virt + port;
600 /* WARNING: The generic code is idiotic. It gets passed a pointer
601 * to what can be a 1, 2 or 4 byte quantity and always reads that
602 * as a u32, which means that we have to correct the location of
603 * the data read within those 32 bits for size 1 and 2
607 out_8(addr, val >> 24);
612 out_le16(addr, val >> 16);
623 /* This provides legacy IO or memory mmap access on a bus */
624 int pci_mmap_legacy_page_range(struct pci_bus *bus,
625 struct vm_area_struct *vma,
626 enum pci_mmap_state mmap_state)
628 struct pci_controller *hose = pci_bus_to_host(bus);
629 resource_size_t offset =
630 ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT;
631 resource_size_t size = vma->vm_end - vma->vm_start;
634 pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n",
635 pci_domain_nr(bus), bus->number,
636 mmap_state == pci_mmap_mem ? "MEM" : "IO",
637 (unsigned long long)offset,
638 (unsigned long long)(offset + size - 1));
640 if (mmap_state == pci_mmap_mem) {
643 * Because X is lame and can fail starting if it gets an error trying
644 * to mmap legacy_mem (instead of just moving on without legacy memory
645 * access) we fake it here by giving it anonymous memory, effectively
646 * behaving just like /dev/zero
648 if ((offset + size) > hose->isa_mem_size) {
650 "Process %s (pid:%d) mapped non-existing PCI legacy memory for 0%04x:%02x\n",
651 current->comm, current->pid, pci_domain_nr(bus), bus->number);
652 if (vma->vm_flags & VM_SHARED)
653 return shmem_zero_setup(vma);
656 offset += hose->isa_mem_phys;
658 unsigned long io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
659 unsigned long roffset = offset + io_offset;
660 rp = &hose->io_resource;
661 if (!(rp->flags & IORESOURCE_IO))
663 if (roffset < rp->start || (roffset + size) > rp->end)
665 offset += hose->io_base_phys;
667 pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset);
669 vma->vm_pgoff = offset >> PAGE_SHIFT;
670 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
671 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
672 vma->vm_end - vma->vm_start,
676 void pci_resource_to_user(const struct pci_dev *dev, int bar,
677 const struct resource *rsrc,
678 resource_size_t *start, resource_size_t *end)
680 struct pci_bus_region region;
682 if (rsrc->flags & IORESOURCE_IO) {
683 pcibios_resource_to_bus(dev->bus, ®ion,
684 (struct resource *) rsrc);
685 *start = region.start;
690 /* We pass a CPU physical address to userland for MMIO instead of a
691 * BAR value because X is lame and expects to be able to use that
692 * to pass to /dev/mem!
694 * That means we may have 64-bit values where some apps only expect
695 * 32 (like X itself since it thinks only Sparc has 64-bit MMIO).
697 *start = rsrc->start;
702 * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree
703 * @hose: newly allocated pci_controller to be setup
704 * @dev: device node of the host bridge
705 * @primary: set if primary bus (32 bits only, soon to be deprecated)
707 * This function will parse the "ranges" property of a PCI host bridge device
708 * node and setup the resource mapping of a pci controller based on its
711 * Life would be boring if it wasn't for a few issues that we have to deal
714 * - We can only cope with one IO space range and up to 3 Memory space
715 * ranges. However, some machines (thanks Apple !) tend to split their
716 * space into lots of small contiguous ranges. So we have to coalesce.
718 * - Some busses have IO space not starting at 0, which causes trouble with
719 * the way we do our IO resource renumbering. The code somewhat deals with
720 * it for 64 bits but I would expect problems on 32 bits.
722 * - Some 32 bits platforms such as 4xx can have physical space larger than
723 * 32 bits so we need to use 64 bits values for the parsing
725 void pci_process_bridge_OF_ranges(struct pci_controller *hose,
726 struct device_node *dev, int primary)
729 struct resource *res;
730 struct of_pci_range range;
731 struct of_pci_range_parser parser;
733 printk(KERN_INFO "PCI host bridge %s %s ranges:\n",
734 dev->full_name, primary ? "(primary)" : "");
736 /* Check for ranges property */
737 if (of_pci_range_parser_init(&parser, dev))
741 for_each_of_pci_range(&parser, &range) {
742 /* If we failed translation or got a zero-sized region
743 * (some FW try to feed us with non sensical zero sized regions
744 * such as power3 which look like some kind of attempt at exposing
745 * the VGA memory hole)
747 if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
750 /* Act based on address space type */
752 switch (range.flags & IORESOURCE_TYPE_BITS) {
755 " IO 0x%016llx..0x%016llx -> 0x%016llx\n",
756 range.cpu_addr, range.cpu_addr + range.size - 1,
759 /* We support only one IO range */
760 if (hose->pci_io_size) {
762 " \\--> Skipped (too many) !\n");
766 /* On 32 bits, limit I/O space to 16MB */
767 if (range.size > 0x01000000)
768 range.size = 0x01000000;
770 /* 32 bits needs to map IOs here */
771 hose->io_base_virt = ioremap(range.cpu_addr,
774 /* Expect trouble if pci_addr is not 0 */
777 (unsigned long)hose->io_base_virt;
778 #endif /* CONFIG_PPC32 */
779 /* pci_io_size and io_base_phys always represent IO
780 * space starting at 0 so we factor in pci_addr
782 hose->pci_io_size = range.pci_addr + range.size;
783 hose->io_base_phys = range.cpu_addr - range.pci_addr;
786 res = &hose->io_resource;
787 range.cpu_addr = range.pci_addr;
791 " MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
792 range.cpu_addr, range.cpu_addr + range.size - 1,
794 (range.pci_space & 0x40000000) ?
797 /* We support only 3 memory ranges */
800 " \\--> Skipped (too many) !\n");
803 /* Handles ISA memory hole space here */
804 if (range.pci_addr == 0) {
805 if (primary || isa_mem_base == 0)
806 isa_mem_base = range.cpu_addr;
807 hose->isa_mem_phys = range.cpu_addr;
808 hose->isa_mem_size = range.size;
812 hose->mem_offset[memno] = range.cpu_addr -
814 res = &hose->mem_resources[memno++];
818 res->name = dev->full_name;
819 res->flags = range.flags;
820 res->start = range.cpu_addr;
821 res->end = range.cpu_addr + range.size - 1;
822 res->parent = res->child = res->sibling = NULL;
827 /* Decide whether to display the domain number in /proc */
828 int pci_proc_domain(struct pci_bus *bus)
830 struct pci_controller *hose = pci_bus_to_host(bus);
832 if (!pci_has_flag(PCI_ENABLE_PROC_DOMAINS))
834 if (pci_has_flag(PCI_COMPAT_DOMAIN_0))
835 return hose->global_number != 0;
839 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
841 if (ppc_md.pcibios_root_bridge_prepare)
842 return ppc_md.pcibios_root_bridge_prepare(bridge);
847 /* This header fixup will do the resource fixup for all devices as they are
848 * probed, but not for bridge ranges
850 static void pcibios_fixup_resources(struct pci_dev *dev)
852 struct pci_controller *hose = pci_bus_to_host(dev->bus);
856 printk(KERN_ERR "No host bridge for PCI dev %s !\n",
864 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
865 struct resource *res = dev->resource + i;
866 struct pci_bus_region reg;
870 /* If we're going to re-assign everything, we mark all resources
871 * as unset (and 0-base them). In addition, we mark BARs starting
872 * at 0 as unset as well, except if PCI_PROBE_ONLY is also set
873 * since in that case, we don't want to re-assign anything
875 pcibios_resource_to_bus(dev->bus, ®, res);
876 if (pci_has_flag(PCI_REASSIGN_ALL_RSRC) ||
877 (reg.start == 0 && !pci_has_flag(PCI_PROBE_ONLY))) {
878 /* Only print message if not re-assigning */
879 if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC))
880 pr_debug("PCI:%s Resource %d %pR is unassigned\n",
881 pci_name(dev), i, res);
882 res->end -= res->start;
884 res->flags |= IORESOURCE_UNSET;
888 pr_debug("PCI:%s Resource %d %pR\n", pci_name(dev), i, res);
891 /* Call machine specific resource fixup */
892 if (ppc_md.pcibios_fixup_resources)
893 ppc_md.pcibios_fixup_resources(dev);
895 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources);
897 /* This function tries to figure out if a bridge resource has been initialized
898 * by the firmware or not. It doesn't have to be absolutely bullet proof, but
899 * things go more smoothly when it gets it right. It should covers cases such
900 * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges
902 static int pcibios_uninitialized_bridge_resource(struct pci_bus *bus,
903 struct resource *res)
905 struct pci_controller *hose = pci_bus_to_host(bus);
906 struct pci_dev *dev = bus->self;
907 resource_size_t offset;
908 struct pci_bus_region region;
912 /* We don't do anything if PCI_PROBE_ONLY is set */
913 if (pci_has_flag(PCI_PROBE_ONLY))
916 /* Job is a bit different between memory and IO */
917 if (res->flags & IORESOURCE_MEM) {
918 pcibios_resource_to_bus(dev->bus, ®ion, res);
920 /* If the BAR is non-0 then it's probably been initialized */
921 if (region.start != 0)
924 /* The BAR is 0, let's check if memory decoding is enabled on
925 * the bridge. If not, we consider it unassigned
927 pci_read_config_word(dev, PCI_COMMAND, &command);
928 if ((command & PCI_COMMAND_MEMORY) == 0)
931 /* Memory decoding is enabled and the BAR is 0. If any of the bridge
932 * resources covers that starting address (0 then it's good enough for
933 * us for memory space)
935 for (i = 0; i < 3; i++) {
936 if ((hose->mem_resources[i].flags & IORESOURCE_MEM) &&
937 hose->mem_resources[i].start == hose->mem_offset[i])
941 /* Well, it starts at 0 and we know it will collide so we may as
942 * well consider it as unassigned. That covers the Apple case.
946 /* If the BAR is non-0, then we consider it assigned */
947 offset = (unsigned long)hose->io_base_virt - _IO_BASE;
948 if (((res->start - offset) & 0xfffffffful) != 0)
951 /* Here, we are a bit different than memory as typically IO space
952 * starting at low addresses -is- valid. What we do instead if that
953 * we consider as unassigned anything that doesn't have IO enabled
954 * in the PCI command register, and that's it.
956 pci_read_config_word(dev, PCI_COMMAND, &command);
957 if (command & PCI_COMMAND_IO)
960 /* It's starting at 0 and IO is disabled in the bridge, consider
967 /* Fixup resources of a PCI<->PCI bridge */
968 static void pcibios_fixup_bridge(struct pci_bus *bus)
970 struct resource *res;
973 struct pci_dev *dev = bus->self;
975 pci_bus_for_each_resource(bus, res, i) {
976 if (!res || !res->flags)
978 if (i >= 3 && bus->self->transparent)
981 /* If we're going to reassign everything, we can
982 * shrink the P2P resource to have size as being
983 * of 0 in order to save space.
985 if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
986 res->flags |= IORESOURCE_UNSET;
992 pr_debug("PCI:%s Bus rsrc %d %pR\n", pci_name(dev), i, res);
994 /* Try to detect uninitialized P2P bridge resources,
995 * and clear them out so they get re-assigned later
997 if (pcibios_uninitialized_bridge_resource(bus, res)) {
999 pr_debug("PCI:%s (unassigned)\n", pci_name(dev));
1004 void pcibios_setup_bus_self(struct pci_bus *bus)
1006 struct pci_controller *phb;
1008 /* Fix up the bus resources for P2P bridges */
1009 if (bus->self != NULL)
1010 pcibios_fixup_bridge(bus);
1012 /* Platform specific bus fixups. This is currently only used
1013 * by fsl_pci and I'm hoping to get rid of it at some point
1015 if (ppc_md.pcibios_fixup_bus)
1016 ppc_md.pcibios_fixup_bus(bus);
1018 /* Setup bus DMA mappings */
1019 phb = pci_bus_to_host(bus);
1020 if (phb->controller_ops.dma_bus_setup)
1021 phb->controller_ops.dma_bus_setup(bus);
1024 static void pcibios_setup_device(struct pci_dev *dev)
1026 struct pci_controller *phb;
1027 /* Fixup NUMA node as it may not be setup yet by the generic
1028 * code and is needed by the DMA init
1030 set_dev_node(&dev->dev, pcibus_to_node(dev->bus));
1032 /* Hook up default DMA ops */
1033 set_dma_ops(&dev->dev, pci_dma_ops);
1034 set_dma_offset(&dev->dev, PCI_DRAM_OFFSET);
1036 /* Additional platform DMA/iommu setup */
1037 phb = pci_bus_to_host(dev->bus);
1038 if (phb->controller_ops.dma_dev_setup)
1039 phb->controller_ops.dma_dev_setup(dev);
1041 /* Read default IRQs and fixup if necessary */
1042 pci_read_irq_line(dev);
1043 if (ppc_md.pci_irq_fixup)
1044 ppc_md.pci_irq_fixup(dev);
1047 int pcibios_add_device(struct pci_dev *dev)
1050 * We can only call pcibios_setup_device() after bus setup is complete,
1051 * since some of the platform specific DMA setup code depends on it.
1053 if (dev->bus->is_added)
1054 pcibios_setup_device(dev);
1056 #ifdef CONFIG_PCI_IOV
1057 if (ppc_md.pcibios_fixup_sriov)
1058 ppc_md.pcibios_fixup_sriov(dev);
1059 #endif /* CONFIG_PCI_IOV */
1064 void pcibios_setup_bus_devices(struct pci_bus *bus)
1066 struct pci_dev *dev;
1068 pr_debug("PCI: Fixup bus devices %d (%s)\n",
1069 bus->number, bus->self ? pci_name(bus->self) : "PHB");
1071 list_for_each_entry(dev, &bus->devices, bus_list) {
1072 /* Cardbus can call us to add new devices to a bus, so ignore
1073 * those who are already fully discovered
1078 pcibios_setup_device(dev);
1082 void pcibios_set_master(struct pci_dev *dev)
1084 /* No special bus mastering setup handling */
1087 void pcibios_fixup_bus(struct pci_bus *bus)
1089 /* When called from the generic PCI probe, read PCI<->PCI bridge
1090 * bases. This is -not- called when generating the PCI tree from
1091 * the OF device-tree.
1093 pci_read_bridge_bases(bus);
1095 /* Now fixup the bus bus */
1096 pcibios_setup_bus_self(bus);
1098 /* Now fixup devices on that bus */
1099 pcibios_setup_bus_devices(bus);
1101 EXPORT_SYMBOL(pcibios_fixup_bus);
1103 void pci_fixup_cardbus(struct pci_bus *bus)
1105 /* Now fixup devices on that bus */
1106 pcibios_setup_bus_devices(bus);
1110 static int skip_isa_ioresource_align(struct pci_dev *dev)
1112 if (pci_has_flag(PCI_CAN_SKIP_ISA_ALIGN) &&
1113 !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA))
1119 * We need to avoid collisions with `mirrored' VGA ports
1120 * and other strange ISA hardware, so we always want the
1121 * addresses to be allocated in the 0x000-0x0ff region
1124 * Why? Because some silly external IO cards only decode
1125 * the low 10 bits of the IO address. The 0x00-0xff region
1126 * is reserved for motherboard devices that decode all 16
1127 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
1128 * but we want to try to avoid allocating at 0x2900-0x2bff
1129 * which might have be mirrored at 0x0100-0x03ff..
1131 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
1132 resource_size_t size, resource_size_t align)
1134 struct pci_dev *dev = data;
1135 resource_size_t start = res->start;
1137 if (res->flags & IORESOURCE_IO) {
1138 if (skip_isa_ioresource_align(dev))
1141 start = (start + 0x3ff) & ~0x3ff;
1146 EXPORT_SYMBOL(pcibios_align_resource);
1149 * Reparent resource children of pr that conflict with res
1150 * under res, and make res replace those children.
1152 static int reparent_resources(struct resource *parent,
1153 struct resource *res)
1155 struct resource *p, **pp;
1156 struct resource **firstpp = NULL;
1158 for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) {
1159 if (p->end < res->start)
1161 if (res->end < p->start)
1163 if (p->start < res->start || p->end > res->end)
1164 return -1; /* not completely contained */
1165 if (firstpp == NULL)
1168 if (firstpp == NULL)
1169 return -1; /* didn't find any conflicting entries? */
1170 res->parent = parent;
1171 res->child = *firstpp;
1175 for (p = res->child; p != NULL; p = p->sibling) {
1177 pr_debug("PCI: Reparented %s %pR under %s\n",
1178 p->name, p, res->name);
1184 * Handle resources of PCI devices. If the world were perfect, we could
1185 * just allocate all the resource regions and do nothing more. It isn't.
1186 * On the other hand, we cannot just re-allocate all devices, as it would
1187 * require us to know lots of host bridge internals. So we attempt to
1188 * keep as much of the original configuration as possible, but tweak it
1189 * when it's found to be wrong.
1191 * Known BIOS problems we have to work around:
1192 * - I/O or memory regions not configured
1193 * - regions configured, but not enabled in the command register
1194 * - bogus I/O addresses above 64K used
1195 * - expansion ROMs left enabled (this may sound harmless, but given
1196 * the fact the PCI specs explicitly allow address decoders to be
1197 * shared between expansion ROMs and other resource regions, it's
1198 * at least dangerous)
1201 * (1) Allocate resources for all buses behind PCI-to-PCI bridges.
1202 * This gives us fixed barriers on where we can allocate.
1203 * (2) Allocate resources for all enabled devices. If there is
1204 * a collision, just mark the resource as unallocated. Also
1205 * disable expansion ROMs during this step.
1206 * (3) Try to allocate resources for disabled devices. If the
1207 * resources were assigned correctly, everything goes well,
1208 * if they weren't, they won't disturb allocation of other
1210 * (4) Assign new addresses to resources which were either
1211 * not configured at all or misconfigured. If explicitly
1212 * requested by the user, configure expansion ROM address
1216 static void pcibios_allocate_bus_resources(struct pci_bus *bus)
1220 struct resource *res, *pr;
1222 pr_debug("PCI: Allocating bus resources for %04x:%02x...\n",
1223 pci_domain_nr(bus), bus->number);
1225 pci_bus_for_each_resource(bus, res, i) {
1226 if (!res || !res->flags || res->start > res->end || res->parent)
1229 /* If the resource was left unset at this point, we clear it */
1230 if (res->flags & IORESOURCE_UNSET)
1231 goto clear_resource;
1233 if (bus->parent == NULL)
1234 pr = (res->flags & IORESOURCE_IO) ?
1235 &ioport_resource : &iomem_resource;
1237 pr = pci_find_parent_resource(bus->self, res);
1239 /* this happens when the generic PCI
1240 * code (wrongly) decides that this
1241 * bridge is transparent -- paulus
1247 pr_debug("PCI: %s (bus %d) bridge rsrc %d: %pR, parent %p (%s)\n",
1248 bus->self ? pci_name(bus->self) : "PHB", bus->number,
1249 i, res, pr, (pr && pr->name) ? pr->name : "nil");
1251 if (pr && !(pr->flags & IORESOURCE_UNSET)) {
1252 struct pci_dev *dev = bus->self;
1254 if (request_resource(pr, res) == 0)
1257 * Must be a conflict with an existing entry.
1258 * Move that entry (or entries) under the
1259 * bridge resource and try again.
1261 if (reparent_resources(pr, res) == 0)
1264 if (dev && i < PCI_BRIDGE_RESOURCE_NUM &&
1265 pci_claim_bridge_resource(dev,
1266 i + PCI_BRIDGE_RESOURCES) == 0)
1269 pr_warning("PCI: Cannot allocate resource region "
1270 "%d of PCI bridge %d, will remap\n", i, bus->number);
1272 /* The resource might be figured out when doing
1273 * reassignment based on the resources required
1274 * by the downstream PCI devices. Here we set
1275 * the size of the resource to be 0 in order to
1283 list_for_each_entry(b, &bus->children, node)
1284 pcibios_allocate_bus_resources(b);
1287 static inline void alloc_resource(struct pci_dev *dev, int idx)
1289 struct resource *pr, *r = &dev->resource[idx];
1291 pr_debug("PCI: Allocating %s: Resource %d: %pR\n",
1292 pci_name(dev), idx, r);
1294 pr = pci_find_parent_resource(dev, r);
1295 if (!pr || (pr->flags & IORESOURCE_UNSET) ||
1296 request_resource(pr, r) < 0) {
1297 printk(KERN_WARNING "PCI: Cannot allocate resource region %d"
1298 " of device %s, will remap\n", idx, pci_name(dev));
1300 pr_debug("PCI: parent is %p: %pR\n", pr, pr);
1301 /* We'll assign a new address later */
1302 r->flags |= IORESOURCE_UNSET;
1308 static void __init pcibios_allocate_resources(int pass)
1310 struct pci_dev *dev = NULL;
1315 for_each_pci_dev(dev) {
1316 pci_read_config_word(dev, PCI_COMMAND, &command);
1317 for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
1318 r = &dev->resource[idx];
1319 if (r->parent) /* Already allocated */
1321 if (!r->flags || (r->flags & IORESOURCE_UNSET))
1322 continue; /* Not assigned at all */
1323 /* We only allocate ROMs on pass 1 just in case they
1324 * have been screwed up by firmware
1326 if (idx == PCI_ROM_RESOURCE )
1328 if (r->flags & IORESOURCE_IO)
1329 disabled = !(command & PCI_COMMAND_IO);
1331 disabled = !(command & PCI_COMMAND_MEMORY);
1332 if (pass == disabled)
1333 alloc_resource(dev, idx);
1337 r = &dev->resource[PCI_ROM_RESOURCE];
1339 /* Turn the ROM off, leave the resource region,
1340 * but keep it unregistered.
1343 pci_read_config_dword(dev, dev->rom_base_reg, ®);
1344 if (reg & PCI_ROM_ADDRESS_ENABLE) {
1345 pr_debug("PCI: Switching off ROM of %s\n",
1347 r->flags &= ~IORESOURCE_ROM_ENABLE;
1348 pci_write_config_dword(dev, dev->rom_base_reg,
1349 reg & ~PCI_ROM_ADDRESS_ENABLE);
1355 static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus)
1357 struct pci_controller *hose = pci_bus_to_host(bus);
1358 resource_size_t offset;
1359 struct resource *res, *pres;
1362 pr_debug("Reserving legacy ranges for domain %04x\n", pci_domain_nr(bus));
1365 if (!(hose->io_resource.flags & IORESOURCE_IO))
1367 offset = (unsigned long)hose->io_base_virt - _IO_BASE;
1368 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
1369 BUG_ON(res == NULL);
1370 res->name = "Legacy IO";
1371 res->flags = IORESOURCE_IO;
1372 res->start = offset;
1373 res->end = (offset + 0xfff) & 0xfffffffful;
1374 pr_debug("Candidate legacy IO: %pR\n", res);
1375 if (request_resource(&hose->io_resource, res)) {
1377 "PCI %04x:%02x Cannot reserve Legacy IO %pR\n",
1378 pci_domain_nr(bus), bus->number, res);
1383 /* Check for memory */
1384 for (i = 0; i < 3; i++) {
1385 pres = &hose->mem_resources[i];
1386 offset = hose->mem_offset[i];
1387 if (!(pres->flags & IORESOURCE_MEM))
1389 pr_debug("hose mem res: %pR\n", pres);
1390 if ((pres->start - offset) <= 0xa0000 &&
1391 (pres->end - offset) >= 0xbffff)
1396 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
1397 BUG_ON(res == NULL);
1398 res->name = "Legacy VGA memory";
1399 res->flags = IORESOURCE_MEM;
1400 res->start = 0xa0000 + offset;
1401 res->end = 0xbffff + offset;
1402 pr_debug("Candidate VGA memory: %pR\n", res);
1403 if (request_resource(pres, res)) {
1405 "PCI %04x:%02x Cannot reserve VGA memory %pR\n",
1406 pci_domain_nr(bus), bus->number, res);
1411 void __init pcibios_resource_survey(void)
1415 /* Allocate and assign resources */
1416 list_for_each_entry(b, &pci_root_buses, node)
1417 pcibios_allocate_bus_resources(b);
1418 if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
1419 pcibios_allocate_resources(0);
1420 pcibios_allocate_resources(1);
1423 /* Before we start assigning unassigned resource, we try to reserve
1424 * the low IO area and the VGA memory area if they intersect the
1425 * bus available resources to avoid allocating things on top of them
1427 if (!pci_has_flag(PCI_PROBE_ONLY)) {
1428 list_for_each_entry(b, &pci_root_buses, node)
1429 pcibios_reserve_legacy_regions(b);
1432 /* Now, if the platform didn't decide to blindly trust the firmware,
1433 * we proceed to assigning things that were left unassigned
1435 if (!pci_has_flag(PCI_PROBE_ONLY)) {
1436 pr_debug("PCI: Assigning unassigned resources...\n");
1437 pci_assign_unassigned_resources();
1440 /* Call machine dependent fixup */
1441 if (ppc_md.pcibios_fixup)
1442 ppc_md.pcibios_fixup();
1445 /* This is used by the PCI hotplug driver to allocate resource
1446 * of newly plugged busses. We can try to consolidate with the
1447 * rest of the code later, for now, keep it as-is as our main
1448 * resource allocation function doesn't deal with sub-trees yet.
1450 void pcibios_claim_one_bus(struct pci_bus *bus)
1452 struct pci_dev *dev;
1453 struct pci_bus *child_bus;
1455 list_for_each_entry(dev, &bus->devices, bus_list) {
1458 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
1459 struct resource *r = &dev->resource[i];
1461 if (r->parent || !r->start || !r->flags)
1464 pr_debug("PCI: Claiming %s: Resource %d: %pR\n",
1465 pci_name(dev), i, r);
1467 if (pci_claim_resource(dev, i) == 0)
1470 pci_claim_bridge_resource(dev, i);
1474 list_for_each_entry(child_bus, &bus->children, node)
1475 pcibios_claim_one_bus(child_bus);
1477 EXPORT_SYMBOL_GPL(pcibios_claim_one_bus);
1480 /* pcibios_finish_adding_to_bus
1482 * This is to be called by the hotplug code after devices have been
1483 * added to a bus, this include calling it for a PHB that is just
1486 void pcibios_finish_adding_to_bus(struct pci_bus *bus)
1488 pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n",
1489 pci_domain_nr(bus), bus->number);
1491 /* Allocate bus and devices resources */
1492 pcibios_allocate_bus_resources(bus);
1493 pcibios_claim_one_bus(bus);
1494 if (!pci_has_flag(PCI_PROBE_ONLY)) {
1496 pci_assign_unassigned_bridge_resources(bus->self);
1498 pci_assign_unassigned_bus_resources(bus);
1502 eeh_add_device_tree_late(bus);
1504 /* Add new devices to global lists. Register in proc, sysfs. */
1505 pci_bus_add_devices(bus);
1507 /* sysfs files should only be added after devices are added */
1508 eeh_add_sysfs_files(bus);
1510 EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus);
1512 int pcibios_enable_device(struct pci_dev *dev, int mask)
1514 struct pci_controller *phb = pci_bus_to_host(dev->bus);
1516 if (phb->controller_ops.enable_device_hook)
1517 if (!phb->controller_ops.enable_device_hook(dev))
1520 return pci_enable_resources(dev, mask);
1523 void pcibios_disable_device(struct pci_dev *dev)
1525 struct pci_controller *phb = pci_bus_to_host(dev->bus);
1527 if (phb->controller_ops.disable_device)
1528 phb->controller_ops.disable_device(dev);
1531 resource_size_t pcibios_io_space_offset(struct pci_controller *hose)
1533 return (unsigned long) hose->io_base_virt - _IO_BASE;
1536 static void pcibios_setup_phb_resources(struct pci_controller *hose,
1537 struct list_head *resources)
1539 struct resource *res;
1540 resource_size_t offset;
1543 /* Hookup PHB IO resource */
1544 res = &hose->io_resource;
1547 pr_debug("PCI: I/O resource not set for host"
1548 " bridge %s (domain %d)\n",
1549 hose->dn->full_name, hose->global_number);
1551 offset = pcibios_io_space_offset(hose);
1553 pr_debug("PCI: PHB IO resource = %pR off 0x%08llx\n",
1554 res, (unsigned long long)offset);
1555 pci_add_resource_offset(resources, res, offset);
1558 /* Hookup PHB Memory resources */
1559 for (i = 0; i < 3; ++i) {
1560 res = &hose->mem_resources[i];
1563 printk(KERN_ERR "PCI: Memory resource 0 not set for "
1564 "host bridge %s (domain %d)\n",
1565 hose->dn->full_name, hose->global_number);
1568 offset = hose->mem_offset[i];
1571 pr_debug("PCI: PHB MEM resource %d = %pR off 0x%08llx\n", i,
1572 res, (unsigned long long)offset);
1574 pci_add_resource_offset(resources, res, offset);
1579 * Null PCI config access functions, for the case when we can't
1582 #define NULL_PCI_OP(rw, size, type) \
1584 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \
1586 return PCIBIOS_DEVICE_NOT_FOUND; \
1590 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
1593 return PCIBIOS_DEVICE_NOT_FOUND;
1597 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
1600 return PCIBIOS_DEVICE_NOT_FOUND;
1603 static struct pci_ops null_pci_ops =
1605 .read = null_read_config,
1606 .write = null_write_config,
1610 * These functions are used early on before PCI scanning is done
1611 * and all of the pci_dev and pci_bus structures have been created.
1613 static struct pci_bus *
1614 fake_pci_bus(struct pci_controller *hose, int busnr)
1616 static struct pci_bus bus;
1619 printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
1623 bus.ops = hose? hose->ops: &null_pci_ops;
1627 #define EARLY_PCI_OP(rw, size, type) \
1628 int early_##rw##_config_##size(struct pci_controller *hose, int bus, \
1629 int devfn, int offset, type value) \
1631 return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \
1632 devfn, offset, value); \
1635 EARLY_PCI_OP(read, byte, u8 *)
1636 EARLY_PCI_OP(read, word, u16 *)
1637 EARLY_PCI_OP(read, dword, u32 *)
1638 EARLY_PCI_OP(write, byte, u8)
1639 EARLY_PCI_OP(write, word, u16)
1640 EARLY_PCI_OP(write, dword, u32)
1642 int early_find_capability(struct pci_controller *hose, int bus, int devfn,
1645 return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
1648 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
1650 struct pci_controller *hose = bus->sysdata;
1652 return of_node_get(hose->dn);
1656 * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus
1657 * @hose: Pointer to the PCI host controller instance structure
1659 void pcibios_scan_phb(struct pci_controller *hose)
1661 LIST_HEAD(resources);
1662 struct pci_bus *bus;
1663 struct device_node *node = hose->dn;
1666 pr_debug("PCI: Scanning PHB %s\n", of_node_full_name(node));
1668 /* Get some IO space for the new PHB */
1669 pcibios_setup_phb_io_space(hose);
1671 /* Wire up PHB bus resources */
1672 pcibios_setup_phb_resources(hose, &resources);
1674 hose->busn.start = hose->first_busno;
1675 hose->busn.end = hose->last_busno;
1676 hose->busn.flags = IORESOURCE_BUS;
1677 pci_add_resource(&resources, &hose->busn);
1679 /* Create an empty bus for the toplevel */
1680 bus = pci_create_root_bus(hose->parent, hose->first_busno,
1681 hose->ops, hose, &resources);
1683 pr_err("Failed to create bus for PCI domain %04x\n",
1684 hose->global_number);
1685 pci_free_resource_list(&resources);
1690 /* Get probe mode and perform scan */
1691 mode = PCI_PROBE_NORMAL;
1692 if (node && hose->controller_ops.probe_mode)
1693 mode = hose->controller_ops.probe_mode(bus);
1694 pr_debug(" probe mode: %d\n", mode);
1695 if (mode == PCI_PROBE_DEVTREE)
1696 of_scan_bus(node, bus);
1698 if (mode == PCI_PROBE_NORMAL) {
1699 pci_bus_update_busn_res_end(bus, 255);
1700 hose->last_busno = pci_scan_child_bus(bus);
1701 pci_bus_update_busn_res_end(bus, hose->last_busno);
1704 /* Platform gets a chance to do some global fixups before
1705 * we proceed to resource allocation
1707 if (ppc_md.pcibios_fixup_phb)
1708 ppc_md.pcibios_fixup_phb(hose);
1710 /* Configure PCI Express settings */
1711 if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {
1712 struct pci_bus *child;
1713 list_for_each_entry(child, &bus->children, node)
1714 pcie_bus_configure_settings(child);
1717 EXPORT_SYMBOL_GPL(pcibios_scan_phb);
1719 static void fixup_hide_host_resource_fsl(struct pci_dev *dev)
1721 int i, class = dev->class >> 8;
1722 /* When configured as agent, programing interface = 1 */
1723 int prog_if = dev->class & 0xf;
1725 if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
1726 class == PCI_CLASS_BRIDGE_OTHER) &&
1727 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
1729 (dev->bus->parent == NULL)) {
1730 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1731 dev->resource[i].start = 0;
1732 dev->resource[i].end = 0;
1733 dev->resource[i].flags = 0;
1737 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
1738 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);
1740 static void fixup_vga(struct pci_dev *pdev)
1744 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
1745 if ((cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) || !vga_default_device())
1746 vga_set_default_device(pdev);
1749 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
1750 PCI_CLASS_DISPLAY_VGA, 8, fixup_vga);