| /* |
| * Common pmac/prep/chrp pci routines. -- Cort |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/pci.h> |
| #include <linux/delay.h> |
| #include <linux/string.h> |
| #include <linux/init.h> |
| #include <linux/capability.h> |
| #include <linux/sched.h> |
| #include <linux/errno.h> |
| #include <linux/bootmem.h> |
| #include <linux/irq.h> |
| #include <linux/list.h> |
| #include <linux/of.h> |
| #include <linux/slab.h> |
| |
| #include <asm/processor.h> |
| #include <asm/io.h> |
| #include <asm/prom.h> |
| #include <asm/sections.h> |
| #include <asm/pci-bridge.h> |
| #include <asm/byteorder.h> |
| #include <asm/uaccess.h> |
| |
| #undef DEBUG |
| |
| unsigned long isa_io_base; |
| unsigned long pci_dram_offset; |
| int pcibios_assign_bus_offset = 1; |
| |
| static u8 *pci_to_OF_bus_map; |
| |
| /* By default, we don't re-assign bus numbers. We do this only on |
| * some pmacs |
| */ |
| static int pci_assign_all_buses; |
| |
| static int pci_bus_count; |
| |
| /* |
| * Functions below are used on OpenFirmware machines. |
| */ |
| static void |
| make_one_node_map(struct device_node *node, u8 pci_bus) |
| { |
| const int *bus_range; |
| int len; |
| |
| if (pci_bus >= pci_bus_count) |
| return; |
| bus_range = of_get_property(node, "bus-range", &len); |
| if (bus_range == NULL || len < 2 * sizeof(int)) { |
| printk(KERN_WARNING "Can't get bus-range for %s, " |
| "assuming it starts at 0\n", node->full_name); |
| pci_to_OF_bus_map[pci_bus] = 0; |
| } else |
| pci_to_OF_bus_map[pci_bus] = bus_range[0]; |
| |
| for_each_child_of_node(node, node) { |
| struct pci_dev *dev; |
| const unsigned int *class_code, *reg; |
| |
| class_code = of_get_property(node, "class-code", NULL); |
| if (!class_code || |
| ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && |
| (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) |
| continue; |
| reg = of_get_property(node, "reg", NULL); |
| if (!reg) |
| continue; |
| dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff)); |
| if (!dev || !dev->subordinate) { |
| pci_dev_put(dev); |
| continue; |
| } |
| make_one_node_map(node, dev->subordinate->number); |
| pci_dev_put(dev); |
| } |
| } |
| |
| void |
| pcibios_make_OF_bus_map(void) |
| { |
| int i; |
| struct pci_controller *hose, *tmp; |
| struct property *map_prop; |
| struct device_node *dn; |
| |
| pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); |
| if (!pci_to_OF_bus_map) { |
| printk(KERN_ERR "Can't allocate OF bus map !\n"); |
| return; |
| } |
| |
| /* We fill the bus map with invalid values, that helps |
| * debugging. |
| */ |
| for (i = 0; i < pci_bus_count; i++) |
| pci_to_OF_bus_map[i] = 0xff; |
| |
| /* For each hose, we begin searching bridges */ |
| list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { |
| struct device_node *node = hose->dn; |
| |
| if (!node) |
| continue; |
| make_one_node_map(node, hose->first_busno); |
| } |
| dn = of_find_node_by_path("/"); |
| map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); |
| if (map_prop) { |
| BUG_ON(pci_bus_count > map_prop->length); |
| memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); |
| } |
| of_node_put(dn); |
| #ifdef DEBUG |
| printk(KERN_INFO "PCI->OF bus map:\n"); |
| for (i = 0; i < pci_bus_count; i++) { |
| if (pci_to_OF_bus_map[i] == 0xff) |
| continue; |
| printk(KERN_INFO "%d -> %d\n", i, pci_to_OF_bus_map[i]); |
| } |
| #endif |
| } |
| |
| typedef int (*pci_OF_scan_iterator)(struct device_node *node, void *data); |
| |
| static struct device_node *scan_OF_pci_childs(struct device_node *parent, |
| pci_OF_scan_iterator filter, void *data) |
| { |
| struct device_node *node; |
| struct device_node *sub_node; |
| |
| for_each_child_of_node(parent, node) { |
| const unsigned int *class_code; |
| |
| if (filter(node, data)) { |
| of_node_put(node); |
| return node; |
| } |
| |
| /* For PCI<->PCI bridges or CardBus bridges, we go down |
| * Note: some OFs create a parent node "multifunc-device" as |
| * a fake root for all functions of a multi-function device, |
| * we go down them as well. |
| */ |
| class_code = of_get_property(node, "class-code", NULL); |
| if ((!class_code || |
| ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && |
| (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) && |
| strcmp(node->name, "multifunc-device")) |
| continue; |
| sub_node = scan_OF_pci_childs(node, filter, data); |
| if (sub_node) { |
| of_node_put(node); |
| return sub_node; |
| } |
| } |
| return NULL; |
| } |
| |
| static struct device_node *scan_OF_for_pci_dev(struct device_node *parent, |
| unsigned int devfn) |
| { |
| struct device_node *np, *cnp; |
| const u32 *reg; |
| unsigned int psize; |
| |
| for_each_child_of_node(parent, np) { |
| reg = of_get_property(np, "reg", &psize); |
| if (reg && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn) |
| return np; |
| |
| /* Note: some OFs create a parent node "multifunc-device" as |
| * a fake root for all functions of a multi-function device, |
| * we go down them as well. */ |
| if (!strcmp(np->name, "multifunc-device")) { |
| cnp = scan_OF_for_pci_dev(np, devfn); |
| if (cnp) |
| return cnp; |
| } |
| } |
| return NULL; |
| } |
| |
| |
| static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus) |
| { |
| struct device_node *parent, *np; |
| |
| /* Are we a root bus ? */ |
| if (bus->self == NULL || bus->parent == NULL) { |
| struct pci_controller *hose = pci_bus_to_host(bus); |
| if (hose == NULL) |
| return NULL; |
| return of_node_get(hose->dn); |
| } |
| |
| /* not a root bus, we need to get our parent */ |
| parent = scan_OF_for_pci_bus(bus->parent); |
| if (parent == NULL) |
| return NULL; |
| |
| /* now iterate for children for a match */ |
| np = scan_OF_for_pci_dev(parent, bus->self->devfn); |
| of_node_put(parent); |
| |
| return np; |
| } |
| |
| /* |
| * Scans the OF tree for a device node matching a PCI device |
| */ |
| struct device_node * |
| pci_busdev_to_OF_node(struct pci_bus *bus, int devfn) |
| { |
| struct device_node *parent, *np; |
| |
| pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn); |
| parent = scan_OF_for_pci_bus(bus); |
| if (parent == NULL) |
| return NULL; |
| pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>"); |
| np = scan_OF_for_pci_dev(parent, devfn); |
| of_node_put(parent); |
| pr_debug(" result is %s\n", np ? np->full_name : "<NULL>"); |
| |
| /* XXX most callers don't release the returned node |
| * mostly because ppc64 doesn't increase the refcount, |
| * we need to fix that. |
| */ |
| return np; |
| } |
| EXPORT_SYMBOL(pci_busdev_to_OF_node); |
| |
| struct device_node* |
| pci_device_to_OF_node(struct pci_dev *dev) |
| { |
| return pci_busdev_to_OF_node(dev->bus, dev->devfn); |
| } |
| EXPORT_SYMBOL(pci_device_to_OF_node); |
| |
| static int |
| find_OF_pci_device_filter(struct device_node *node, void *data) |
| { |
| return ((void *)node == data); |
| } |
| |
| /* |
| * Returns the PCI device matching a given OF node |
| */ |
| int |
| pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) |
| { |
| const unsigned int *reg; |
| struct pci_controller *hose; |
| struct pci_dev *dev = NULL; |
| |
| /* Make sure it's really a PCI device */ |
| hose = pci_find_hose_for_OF_device(node); |
| if (!hose || !hose->dn) |
| return -ENODEV; |
| if (!scan_OF_pci_childs(hose->dn, |
| find_OF_pci_device_filter, (void *)node)) |
| return -ENODEV; |
| reg = of_get_property(node, "reg", NULL); |
| if (!reg) |
| return -ENODEV; |
| *bus = (reg[0] >> 16) & 0xff; |
| *devfn = ((reg[0] >> 8) & 0xff); |
| |
| /* Ok, here we need some tweak. If we have already renumbered |
| * all busses, we can't rely on the OF bus number any more. |
| * the pci_to_OF_bus_map is not enough as several PCI busses |
| * may match the same OF bus number. |
| */ |
| if (!pci_to_OF_bus_map) |
| return 0; |
| |
| for_each_pci_dev(dev) |
| if (pci_to_OF_bus_map[dev->bus->number] == *bus && |
| dev->devfn == *devfn) { |
| *bus = dev->bus->number; |
| pci_dev_put(dev); |
| return 0; |
| } |
| |
| return -ENODEV; |
| } |
| EXPORT_SYMBOL(pci_device_from_OF_node); |
| |
| /* We create the "pci-OF-bus-map" property now so it appears in the |
| * /proc device tree |
| */ |
| void __init |
| pci_create_OF_bus_map(void) |
| { |
| struct property *of_prop; |
| struct device_node *dn; |
| |
| of_prop = (struct property *) alloc_bootmem(sizeof(struct property) + \ |
| 256); |
| if (!of_prop) |
| return; |
| dn = of_find_node_by_path("/"); |
| if (dn) { |
| memset(of_prop, -1, sizeof(struct property) + 256); |
| of_prop->name = "pci-OF-bus-map"; |
| of_prop->length = 256; |
| of_prop->value = &of_prop[1]; |
| prom_add_property(dn, of_prop); |
| of_node_put(dn); |
| } |
| } |
| |
| static void __devinit pcibios_scan_phb(struct pci_controller *hose) |
| { |
| struct pci_bus *bus; |
| struct device_node *node = hose->dn; |
| unsigned long io_offset; |
| struct resource *res = &hose->io_resource; |
| |
| pr_debug("PCI: Scanning PHB %s\n", |
| node ? node->full_name : "<NO NAME>"); |
| |
| /* Create an empty bus for the toplevel */ |
| bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose); |
| if (bus == NULL) { |
| printk(KERN_ERR "Failed to create bus for PCI domain %04x\n", |
| hose->global_number); |
| return; |
| } |
| bus->dev.of_node = of_node_get(node); |
| bus->secondary = hose->first_busno; |
| hose->bus = bus; |
| |
| /* 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; |
| |
| /* Wire up PHB bus resources */ |
| pcibios_setup_phb_resources(hose); |
| |
| /* Scan children */ |
| hose->last_busno = bus->subordinate = pci_scan_child_bus(bus); |
| } |
| |
| static int __init pcibios_init(void) |
| { |
| struct pci_controller *hose, *tmp; |
| int next_busno = 0; |
| |
| printk(KERN_INFO "PCI: Probing PCI hardware\n"); |
| |
| if (pci_flags & PCI_REASSIGN_ALL_BUS) { |
| printk(KERN_INFO "setting pci_asign_all_busses\n"); |
| pci_assign_all_buses = 1; |
| } |
| |
| /* Scan all of the recorded PCI controllers. */ |
| list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { |
| if (pci_assign_all_buses) |
| hose->first_busno = next_busno; |
| hose->last_busno = 0xff; |
| pcibios_scan_phb(hose); |
| printk(KERN_INFO "calling pci_bus_add_devices()\n"); |
| pci_bus_add_devices(hose->bus); |
| if (pci_assign_all_buses || next_busno <= hose->last_busno) |
| next_busno = hose->last_busno + \ |
| pcibios_assign_bus_offset; |
| } |
| pci_bus_count = next_busno; |
| |
| /* OpenFirmware based machines need a map of OF bus |
| * numbers vs. kernel bus numbers since we may have to |
| * remap them. |
| */ |
| if (pci_assign_all_buses) |
| pcibios_make_OF_bus_map(); |
| |
| /* Call common code to handle resource allocation */ |
| pcibios_resource_survey(); |
| |
| return 0; |
| } |
| |
| subsys_initcall(pcibios_init); |
| |
| static struct pci_controller* |
| pci_bus_to_hose(int bus) |
| { |
| struct pci_controller *hose, *tmp; |
| |
| list_for_each_entry_safe(hose, tmp, &hose_list, list_node) |
| if (bus >= hose->first_busno && bus <= hose->last_busno) |
| return hose; |
| return NULL; |
| } |
| |
| /* Provide information on locations of various I/O regions in physical |
| * memory. Do this on a per-card basis so that we choose the right |
| * root bridge. |
| * Note that the returned IO or memory base is a physical address |
| */ |
| |
| long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) |
| { |
| struct pci_controller *hose; |
| long result = -EOPNOTSUPP; |
| |
| hose = pci_bus_to_hose(bus); |
| if (!hose) |
| return -ENODEV; |
| |
| switch (which) { |
| case IOBASE_BRIDGE_NUMBER: |
| return (long)hose->first_busno; |
| case IOBASE_MEMORY: |
| return (long)hose->pci_mem_offset; |
| case IOBASE_IO: |
| return (long)hose->io_base_phys; |
| case IOBASE_ISA_IO: |
| return (long)isa_io_base; |
| case IOBASE_ISA_MEM: |
| return (long)isa_mem_base; |
| } |
| |
| return result; |
| } |