diff options
Diffstat (limited to 'arch/powerpc/kernel/pci_32.c')
-rw-r--r-- | arch/powerpc/kernel/pci_32.c | 246 |
1 files changed, 3 insertions, 243 deletions
diff --git a/arch/powerpc/kernel/pci_32.c b/arch/powerpc/kernel/pci_32.c index 717c554d465..ce7c20c8191 100644 --- a/arch/powerpc/kernel/pci_32.c +++ b/arch/powerpc/kernel/pci_32.c @@ -35,13 +35,9 @@ unsigned long isa_io_base = 0; unsigned long pci_dram_offset = 0; int pcibios_assign_bus_offset = 1; -/* Default PCI flags is 0 */ -unsigned int ppc_pci_flags; - void pcibios_make_OF_bus_map(void); static void fixup_broken_pcnet32(struct pci_dev* dev); -static int reparent_resources(struct resource *parent, struct resource *res); static void fixup_cpc710_pci64(struct pci_dev* dev); #ifdef CONFIG_PPC_OF static u8* pci_to_OF_bus_map; @@ -97,170 +93,6 @@ fixup_cpc710_pci64(struct pci_dev* dev) } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); -static int skip_isa_ioresource_align(struct pci_dev *dev) -{ - if ((ppc_pci_flags & PPC_PCI_CAN_SKIP_ISA_ALIGN) && - !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA)) - return 1; - return 0; -} - -/* - * We need to avoid collisions with `mirrored' VGA ports - * and other strange ISA hardware, so we always want the - * addresses to be allocated in the 0x000-0x0ff region - * modulo 0x400. - * - * Why? Because some silly external IO cards only decode - * the low 10 bits of the IO address. The 0x00-0xff region - * is reserved for motherboard devices that decode all 16 - * bits, so it's ok to allocate at, say, 0x2800-0x28ff, - * but we want to try to avoid allocating at 0x2900-0x2bff - * which might have be mirrored at 0x0100-0x03ff.. - */ -void pcibios_align_resource(void *data, struct resource *res, - resource_size_t size, resource_size_t align) -{ - struct pci_dev *dev = data; - - if (res->flags & IORESOURCE_IO) { - resource_size_t start = res->start; - - if (skip_isa_ioresource_align(dev)) - return; - if (start & 0x300) { - start = (start + 0x3ff) & ~0x3ff; - res->start = start; - } - } -} -EXPORT_SYMBOL(pcibios_align_resource); - -/* - * Handle resources of PCI devices. If the world were perfect, we could - * just allocate all the resource regions and do nothing more. It isn't. - * On the other hand, we cannot just re-allocate all devices, as it would - * require us to know lots of host bridge internals. So we attempt to - * keep as much of the original configuration as possible, but tweak it - * when it's found to be wrong. - * - * Known BIOS problems we have to work around: - * - I/O or memory regions not configured - * - regions configured, but not enabled in the command register - * - bogus I/O addresses above 64K used - * - expansion ROMs left enabled (this may sound harmless, but given - * the fact the PCI specs explicitly allow address decoders to be - * shared between expansion ROMs and other resource regions, it's - * at least dangerous) - * - * Our solution: - * (1) Allocate resources for all buses behind PCI-to-PCI bridges. - * This gives us fixed barriers on where we can allocate. - * (2) Allocate resources for all enabled devices. If there is - * a collision, just mark the resource as unallocated. Also - * disable expansion ROMs during this step. - * (3) Try to allocate resources for disabled devices. If the - * resources were assigned correctly, everything goes well, - * if they weren't, they won't disturb allocation of other - * resources. - * (4) Assign new addresses to resources which were either - * not configured at all or misconfigured. If explicitly - * requested by the user, configure expansion ROM address - * as well. - */ - -static void __init -pcibios_allocate_bus_resources(struct list_head *bus_list) -{ - struct pci_bus *bus; - int i; - struct resource *res, *pr; - - /* Depth-First Search on bus tree */ - list_for_each_entry(bus, bus_list, node) { - for (i = 0; i < 4; ++i) { - if ((res = bus->resource[i]) == NULL || !res->flags - || res->start > res->end) - continue; - if (bus->parent == NULL) - pr = (res->flags & IORESOURCE_IO)? - &ioport_resource : &iomem_resource; - else { - /* Don't bother with non-root busses when - * re-assigning all resources. - */ - if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_RSRC) - continue; - pr = pci_find_parent_resource(bus->self, res); - if (pr == res) { - /* this happens when the generic PCI - * code (wrongly) decides that this - * bridge is transparent -- paulus - */ - continue; - } - } - - DBG("PCI: dev %s (bus 0x%02x) bridge rsrc %d: %016llx..%016llx " - "(f:0x%08lx), parent %p\n", - bus->self ? pci_name(bus->self) : "PHB", bus->number, i, - (u64)res->start, (u64)res->end, res->flags, pr); - - if (pr && !(pr->flags & IORESOURCE_UNSET)) { - if (request_resource(pr, res) == 0) - continue; - /* - * Must be a conflict with an existing entry. - * Move that entry (or entries) under the - * bridge resource and try again. - */ - if (reparent_resources(pr, res) == 0) - continue; - } - printk(KERN_WARNING - "PCI: Cannot allocate resource region " - "%d of PCI bridge %d, will remap\n", - i, bus->number); - res->flags |= IORESOURCE_UNSET; - } - pcibios_allocate_bus_resources(&bus->children); - } -} - -/* - * Reparent resource children of pr that conflict with res - * under res, and make res replace those children. - */ -static int __init -reparent_resources(struct resource *parent, struct resource *res) -{ - struct resource *p, **pp; - struct resource **firstpp = NULL; - - for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) { - if (p->end < res->start) - continue; - if (res->end < p->start) - break; - if (p->start < res->start || p->end > res->end) - return -1; /* not completely contained */ - if (firstpp == NULL) - firstpp = pp; - } - if (firstpp == NULL) - return -1; /* didn't find any conflicting entries? */ - res->parent = parent; - res->child = *firstpp; - res->sibling = *pp; - *firstpp = res; - *pp = NULL; - for (p = res->child; p != NULL; p = p->sibling) { - p->parent = res; - DBG(KERN_INFO "PCI: reparented %s [%llx..%llx] under %s\n", - p->name, (u64)p->start, (u64)p->end, res->name); - } - return 0; -} void __init update_bridge_resource(struct pci_dev *dev, struct resource *res) @@ -318,63 +150,6 @@ update_bridge_resource(struct pci_dev *dev, struct resource *res) pci_write_config_word(dev, PCI_COMMAND, cmd); } -static inline void alloc_resource(struct pci_dev *dev, int idx) -{ - struct resource *pr, *r = &dev->resource[idx]; - - DBG("PCI: Allocating %s: Resource %d: %016llx..%016llx (f=%lx)\n", - pci_name(dev), idx, (u64)r->start, (u64)r->end, r->flags); - pr = pci_find_parent_resource(dev, r); - if (!pr || (pr->flags & IORESOURCE_UNSET) || request_resource(pr, r) < 0) { - printk(KERN_WARNING "PCI: Cannot allocate resource region %d" - " of device %s, will remap\n", idx, pci_name(dev)); - if (pr) - DBG("PCI: parent is %p: %016llx-%016llx (f=%lx)\n", - pr, (u64)pr->start, (u64)pr->end, pr->flags); - /* We'll assign a new address later */ - r->flags |= IORESOURCE_UNSET; - r->end -= r->start; - r->start = 0; - } -} - -static void __init -pcibios_allocate_resources(int pass) -{ - struct pci_dev *dev = NULL; - int idx, disabled; - u16 command; - struct resource *r; - - for_each_pci_dev(dev) { - pci_read_config_word(dev, PCI_COMMAND, &command); - for (idx = 0; idx < 6; idx++) { - r = &dev->resource[idx]; - if (r->parent) /* Already allocated */ - continue; - if (!r->flags || (r->flags & IORESOURCE_UNSET)) - continue; /* Not assigned at all */ - if (r->flags & IORESOURCE_IO) - disabled = !(command & PCI_COMMAND_IO); - else - disabled = !(command & PCI_COMMAND_MEMORY); - if (pass == disabled) - alloc_resource(dev, idx); - } - if (pass) - continue; - r = &dev->resource[PCI_ROM_RESOURCE]; - if (r->flags & IORESOURCE_ROM_ENABLE) { - /* Turn the ROM off, leave the resource region, but keep it unregistered. */ - u32 reg; - DBG("PCI: Switching off ROM of %s\n", pci_name(dev)); - r->flags &= ~IORESOURCE_ROM_ENABLE; - pci_read_config_dword(dev, dev->rom_base_reg, ®); - pci_write_config_dword(dev, dev->rom_base_reg, - reg & ~PCI_ROM_ADDRESS_ENABLE); - } - } -} #ifdef CONFIG_PPC_OF /* @@ -649,8 +424,7 @@ void pcibios_make_OF_bus_map(void) } #endif /* CONFIG_PPC_OF */ -static int __init -pcibios_init(void) +static int __init pcibios_init(void) { struct pci_controller *hose, *tmp; struct pci_bus *bus; @@ -683,22 +457,8 @@ pcibios_init(void) if (pci_assign_all_buses && have_of) pcibios_make_OF_bus_map(); - /* Call machine dependent fixup */ - if (ppc_md.pcibios_fixup) - ppc_md.pcibios_fixup(); - - /* Allocate and assign resources. If we re-assign everything, then - * we skip the allocate phase - */ - pcibios_allocate_bus_resources(&pci_root_buses); - if (!(ppc_pci_flags & PPC_PCI_REASSIGN_ALL_RSRC)) { - pcibios_allocate_resources(0); - pcibios_allocate_resources(1); - } - if (!(ppc_pci_flags & PPC_PCI_PROBE_ONLY)) { - DBG("PCI: Assigning unassigned resouces...\n"); - pci_assign_unassigned_resources(); - } + /* Call common code to handle resource allocation */ + pcibios_resource_survey(); /* Call machine dependent post-init code */ if (ppc_md.pcibios_after_init) |