unsigned long isa_io_base;
EXPORT_SYMBOL(isa_io_base);
-static int pci_bus_count;
-
static resource_size_t pcibios_io_size(const struct pci_controller *hose)
{
return resource_size(&hose->io_resource);
}
EXPORT_SYMBOL_GPL(pci_address_to_pio);
-void pcibios_set_master(struct pci_dev *dev)
-{
- /* No special bus mastering setup handling */
-}
-
/*
* Platform support for /proc/bus/pci/X/Y mmap()s.
*/
return 0;
}
-void pci_resource_to_user(const struct pci_dev *dev, int bar,
- const struct resource *rsrc,
- resource_size_t *start, resource_size_t *end)
-{
- struct pci_bus_region region;
-
- if (rsrc->flags & IORESOURCE_IO) {
- pcibios_resource_to_bus(dev->bus, ®ion,
- (struct resource *) rsrc);
- *start = region.start;
- *end = region.end;
- return;
- }
-
- /* We pass a CPU physical address to userland for MMIO instead of a
- * BAR value because X is lame and expects to be able to use that
- * to pass to /dev/mem!
- *
- * That means we may have 64-bit values where some apps only expect
- * 32 (like X itself since it thinks only Sparc has 64-bit MMIO).
- */
- *start = rsrc->start;
- *end = rsrc->end;
-}
-
/* Display the domain number in /proc */
int pci_proc_domain(struct pci_bus *bus)
{
return pci_domain_nr(bus);
}
-/* This header fixup will do the resource fixup for all devices as they are
- * probed, but not for bridge ranges
- */
-static void pcibios_fixup_resources(struct pci_dev *dev)
-{
- struct pci_controller *hose = pci_bus_to_host(dev->bus);
- int i;
-
- if (!hose) {
- pr_err("No host bridge for PCI dev %s !\n",
- pci_name(dev));
- return;
- }
- for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
- struct resource *res = dev->resource + i;
- if (!res->flags)
- continue;
- if (res->start == 0) {
- pr_debug("PCI:%s Resource %d %016llx-%016llx [%x]",
- pci_name(dev), i,
- (unsigned long long)res->start,
- (unsigned long long)res->end,
- (unsigned int)res->flags);
- pr_debug("is unassigned\n");
- res->end -= res->start;
- res->start = 0;
- res->flags |= IORESOURCE_UNSET;
- continue;
- }
-
- pr_debug("PCI:%s Resource %d %016llx-%016llx [%x]\n",
- pci_name(dev), i,
- (unsigned long long)res->start,
- (unsigned long long)res->end,
- (unsigned int)res->flags);
- }
-}
-DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources);
-
-int pcibios_device_add(struct pci_dev *dev)
-{
- dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
-
- return 0;
-}
-
-/*
- * 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;
- pr_debug("PCI: Reparented %s [%llx..%llx] under %s\n",
- p->name,
- (unsigned long long)p->start,
- (unsigned long long)p->end, res->name);
- }
- return 0;
-}
-
-/*
- * 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 pcibios_allocate_bus_resources(struct pci_bus *bus)
-{
- struct pci_bus *b;
- int i;
- struct resource *res, *pr;
-
- pr_debug("PCI: Allocating bus resources for %04x:%02x...\n",
- pci_domain_nr(bus), bus->number);
-
- pci_bus_for_each_resource(bus, res, i) {
- if (!res || !res->flags
- || res->start > res->end || res->parent)
- 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. We clear the
- * resource flags as if they were colliding
- * and as such ensure proper re-allocation
- * later.
- */
- 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;
- }
- }
-
- pr_debug("PCI: %s (bus %d) bridge rsrc %d: %016llx-%016llx ",
- bus->self ? pci_name(bus->self) : "PHB",
- bus->number, i,
- (unsigned long long)res->start,
- (unsigned long long)res->end);
- pr_debug("[0x%x], parent %p (%s)\n",
- (unsigned int)res->flags,
- pr, (pr && pr->name) ? pr->name : "nil");
-
- if (pr && !(pr->flags & IORESOURCE_UNSET)) {
- struct pci_dev *dev = bus->self;
-
- 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;
-
- if (dev && i < PCI_BRIDGE_RESOURCE_NUM &&
- pci_claim_bridge_resource(dev,
- i + PCI_BRIDGE_RESOURCES) == 0)
- continue;
-
- }
- pr_warn("PCI: Cannot allocate resource region ");
- pr_cont("%d of PCI bridge %d, will remap\n", i, bus->number);
- res->start = res->end = 0;
- res->flags = 0;
- }
-
- list_for_each_entry(b, &bus->children, node)
- pcibios_allocate_bus_resources(b);
-}
-
-static inline void alloc_resource(struct pci_dev *dev, int idx)
-{
- struct resource *pr, *r = &dev->resource[idx];
-
- pr_debug("PCI: Allocating %s: Resource %d: %016llx..%016llx [%x]\n",
- pci_name(dev), idx,
- (unsigned long long)r->start,
- (unsigned long long)r->end,
- (unsigned int)r->flags);
-
- pr = pci_find_parent_resource(dev, r);
- if (!pr || (pr->flags & IORESOURCE_UNSET) ||
- request_resource(pr, r) < 0) {
- pr_warn("PCI: Cannot allocate resource region %d ", idx);
- pr_cont("of device %s, will remap\n", pci_name(dev));
- if (pr)
- pr_debug("PCI: parent is %p: %016llx-%016llx [%x]\n",
- pr,
- (unsigned long long)pr->start,
- (unsigned long long)pr->end,
- (unsigned int)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 <= PCI_ROM_RESOURCE; idx++) {
- r = &dev->resource[idx];
- if (r->parent) /* Already allocated */
- continue;
- if (!r->flags || (r->flags & IORESOURCE_UNSET))
- continue; /* Not assigned at all */
- /* We only allocate ROMs on pass 1 just in case they
- * have been screwed up by firmware
- */
- if (idx == PCI_ROM_RESOURCE)
- disabled = 1;
- 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) {
- /* Turn the ROM off, leave the resource region,
- * but keep it unregistered.
- */
- u32 reg;
- pci_read_config_dword(dev, dev->rom_base_reg, ®);
- if (reg & PCI_ROM_ADDRESS_ENABLE) {
- pr_debug("PCI: Switching off ROM of %s\n",
- pci_name(dev));
- r->flags &= ~IORESOURCE_ROM_ENABLE;
- pci_write_config_dword(dev, dev->rom_base_reg,
- reg & ~PCI_ROM_ADDRESS_ENABLE);
- }
- }
- }
-}
-
-static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus)
-{
- struct pci_controller *hose = pci_bus_to_host(bus);
- resource_size_t offset;
- struct resource *res, *pres;
- int i;
-
- pr_debug("Reserving legacy ranges for domain %04x\n",
- pci_domain_nr(bus));
-
- /* Check for IO */
- if (!(hose->io_resource.flags & IORESOURCE_IO))
- goto no_io;
- offset = (unsigned long)hose->io_base_virt - _IO_BASE;
- res = kzalloc(sizeof(struct resource), GFP_KERNEL);
- BUG_ON(res == NULL);
- res->name = "Legacy IO";
- res->flags = IORESOURCE_IO;
- res->start = offset;
- res->end = (offset + 0xfff) & 0xfffffffful;
- pr_debug("Candidate legacy IO: %pR\n", res);
- if (request_resource(&hose->io_resource, res)) {
- pr_debug("PCI %04x:%02x Cannot reserve Legacy IO %pR\n",
- pci_domain_nr(bus), bus->number, res);
- kfree(res);
- }
-
- no_io:
- /* Check for memory */
- offset = hose->pci_mem_offset;
- pr_debug("hose mem offset: %016llx\n", (unsigned long long)offset);
- for (i = 0; i < 3; i++) {
- pres = &hose->mem_resources[i];
- if (!(pres->flags & IORESOURCE_MEM))
- continue;
- pr_debug("hose mem res: %pR\n", pres);
- if ((pres->start - offset) <= 0xa0000 &&
- (pres->end - offset) >= 0xbffff)
- break;
- }
- if (i >= 3)
- return;
- res = kzalloc(sizeof(struct resource), GFP_KERNEL);
- BUG_ON(res == NULL);
- res->name = "Legacy VGA memory";
- res->flags = IORESOURCE_MEM;
- res->start = 0xa0000 + offset;
- res->end = 0xbffff + offset;
- pr_debug("Candidate VGA memory: %pR\n", res);
- if (request_resource(pres, res)) {
- pr_debug("PCI %04x:%02x Cannot reserve VGA memory %pR\n",
- pci_domain_nr(bus), bus->number, res);
- kfree(res);
- }
-}
-
-void __init pcibios_resource_survey(void)
-{
- struct pci_bus *b;
-
- /* Allocate and assign resources. If we re-assign everything, then
- * we skip the allocate phase
- */
- list_for_each_entry(b, &pci_root_buses, node)
- pcibios_allocate_bus_resources(b);
-
- pcibios_allocate_resources(0);
- pcibios_allocate_resources(1);
-
- /* Before we start assigning unassigned resource, we try to reserve
- * the low IO area and the VGA memory area if they intersect the
- * bus available resources to avoid allocating things on top of them
- */
- list_for_each_entry(b, &pci_root_buses, node)
- pcibios_reserve_legacy_regions(b);
-
- /* Now proceed to assigning things that were left unassigned */
- pr_debug("PCI: Assigning unassigned resources...\n");
- pci_assign_unassigned_resources();
-}
-
-static void pcibios_setup_phb_resources(struct pci_controller *hose,
- struct list_head *resources)
-{
- unsigned long io_offset;
- struct resource *res;
- int i;
-
- /* Hookup PHB IO resource */
- res = &hose->io_resource;
-
- /* Fixup IO space offset */
- io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
- res->start = (res->start + io_offset) & 0xffffffffu;
- res->end = (res->end + io_offset) & 0xffffffffu;
-
- if (!res->flags) {
- pr_warn("PCI: I/O resource not set for host ");
- pr_cont("bridge %pOF (domain %d)\n",
- hose->dn, hose->global_number);
- /* Workaround for lack of IO resource only on 32-bit */
- res->start = (unsigned long)hose->io_base_virt - isa_io_base;
- res->end = res->start + IO_SPACE_LIMIT;
- res->flags = IORESOURCE_IO;
- }
- pci_add_resource_offset(resources, res,
- (__force resource_size_t)(hose->io_base_virt - _IO_BASE));
-
- pr_debug("PCI: PHB IO resource = %016llx-%016llx [%lx]\n",
- (unsigned long long)res->start,
- (unsigned long long)res->end,
- (unsigned long)res->flags);
-
- /* Hookup PHB Memory resources */
- for (i = 0; i < 3; ++i) {
- res = &hose->mem_resources[i];
- if (!res->flags) {
- if (i > 0)
- continue;
- pr_err("PCI: Memory resource 0 not set for ");
- pr_cont("host bridge %pOF (domain %d)\n",
- hose->dn, hose->global_number);
-
- /* Workaround for lack of MEM resource only on 32-bit */
- res->start = hose->pci_mem_offset;
- res->end = (resource_size_t)-1LL;
- res->flags = IORESOURCE_MEM;
-
- }
- pci_add_resource_offset(resources, res, hose->pci_mem_offset);
-
- pr_debug("PCI: PHB MEM resource %d = %016llx-%016llx [%lx]\n",
- i, (unsigned long long)res->start,
- (unsigned long long)res->end,
- (unsigned long)res->flags);
- }
-
- pr_debug("PCI: PHB MEM offset = %016llx\n",
- (unsigned long long)hose->pci_mem_offset);
- pr_debug("PCI: PHB IO offset = %08lx\n",
- (unsigned long)hose->io_base_virt - _IO_BASE);
-}
-
-static void pcibios_scan_phb(struct pci_controller *hose)
-{
- LIST_HEAD(resources);
- struct pci_bus *bus;
- struct device_node *node = hose->dn;
-
- pr_debug("PCI: Scanning PHB %pOF\n", node);
-
- pcibios_setup_phb_resources(hose, &resources);
-
- bus = pci_scan_root_bus(hose->parent, hose->first_busno,
- hose->ops, hose, &resources);
- if (bus == NULL) {
- pr_err("Failed to create bus for PCI domain %04x\n",
- hose->global_number);
- pci_free_resource_list(&resources);
- return;
- }
- bus->busn_res.start = hose->first_busno;
- hose->bus = bus;
-
- hose->last_busno = bus->busn_res.end;
-}
-
-static int __init pcibios_init(void)
-{
- struct pci_controller *hose, *tmp;
- int next_busno = 0;
-
- pr_info("PCI: Probing PCI hardware\n");
-
- /* Scan all of the recorded PCI controllers. */
- list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
- hose->last_busno = 0xff;
- pcibios_scan_phb(hose);
- if (next_busno <= hose->last_busno)
- next_busno = hose->last_busno + 1;
- }
- pci_bus_count = next_busno;
-
- /* Call common code to handle resource allocation */
- pcibios_resource_survey();
- list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
- if (hose->bus)
- pci_bus_add_devices(hose->bus);
- }
-
- return 0;
-}
-
-subsys_initcall(pcibios_init);
-
static struct pci_controller *pci_bus_to_hose(int bus)
{
struct pci_controller *hose, *tmp;
projects / thirdparty / kernel / linux.git / commitdiff
