/* * 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 <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> #include <asm/machdep.h> #undef DEBUG #ifdef DEBUG #define DBG(x...) printk(x) #else #define DBG(x...) #endif unsigned long isa_io_base = 0; unsigned long pci_dram_offset = 0; int pcibios_assign_bus_offset = 1; void pcibios_make_OF_bus_map(void); static void fixup_broken_pcnet32(struct pci_dev* dev); static void fixup_cpc710_pci64(struct pci_dev* dev); #ifdef CONFIG_PPC_OF static u8* pci_to_OF_bus_map; #endif /* By default, we don't re-assign bus numbers. We do this only on * some pmacs */ static int pci_assign_all_buses; LIST_HEAD(hose_list); static int pci_bus_count; static void fixup_hide_host_resource_fsl(struct pci_dev* dev) { int i, class = dev->class >> 8; if ((class == PCI_CLASS_PROCESSOR_POWERPC) && (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) && (dev->bus->parent == NULL)) { for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { dev->resource[i].start = 0; dev->resource[i].end = 0; dev->resource[i].flags = 0; } } } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl); DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl); static void fixup_broken_pcnet32(struct pci_dev* dev) { if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) { dev->vendor = PCI_VENDOR_ID_AMD; pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD); } } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID, fixup_broken_pcnet32); static void fixup_cpc710_pci64(struct pci_dev* dev) { /* Hide the PCI64 BARs from the kernel as their content doesn't * fit well in the resource management */ dev->resource[0].start = dev->resource[0].end = 0; dev->resource[0].flags = 0; dev->resource[1].start = dev->resource[1].end = 0; dev->resource[1].flags = 0; } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); #ifdef CONFIG_PPC_OF /* * 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("PCI->OF bus map:\n"); for (i=0; i<pci_bus_count; i++) { if (pci_to_OF_bus_map[i] == 0xff) continue; printk("%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; const u32 *reg; unsigned int psize; for_each_child_of_node(parent, np) { reg = of_get_property(np, "reg", &psize); if (reg == NULL || psize < 4) continue; if (((reg[0] >> 8) & 0xff) == devfn) return np; } 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; if (!have_of) return NULL; DBG("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn); parent = scan_OF_for_pci_bus(bus); if (parent == NULL) return NULL; DBG(" parent is %s\n", parent ? parent->full_name : "<NULL>"); np = scan_OF_for_pci_dev(parent, devfn); of_node_put(parent); DBG(" 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; if (!have_of) return -ENODEV; /* 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); } } #else /* CONFIG_PPC_OF */ void pcibios_make_OF_bus_map(void) { } #endif /* CONFIG_PPC_OF */ static int __init pcibios_init(void) { struct pci_controller *hose, *tmp; struct pci_bus *bus; int next_busno = 0; printk(KERN_INFO "PCI: Probing PCI hardware\n"); if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS) 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; bus = pci_scan_bus_parented(hose->parent, hose->first_busno, hose->ops, hose); if (bus) { pci_bus_add_devices(bus); hose->last_busno = bus->subordinate; } 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 && have_of) pcibios_make_OF_bus_map(); /* Call common code to handle resource allocation */ pcibios_resource_survey(); /* Call machine dependent post-init code */ if (ppc_md.pcibios_after_init) ppc_md.pcibios_after_init(); return 0; } subsys_initcall(pcibios_init); void __devinit pcibios_do_bus_setup(struct pci_bus *bus) { struct pci_controller *hose = (struct pci_controller *) bus->sysdata; unsigned long io_offset; struct resource *res; int i; /* Hookup PHB resources */ io_offset = (unsigned long)hose->io_base_virt - isa_io_base; if (bus->parent == NULL) { /* This is a host bridge - fill in its resources */ hose->bus = bus; bus->resource[0] = res = &hose->io_resource; if (!res->flags) { if (io_offset) printk(KERN_ERR "I/O resource not set for host" " bridge %d\n", hose->global_number); res->start = 0; res->end = IO_SPACE_LIMIT; res->flags = IORESOURCE_IO; } res->start = (res->start + io_offset) & 0xffffffffu; res->end = (res->end + io_offset) & 0xffffffffu; for (i = 0; i < 3; ++i) { res = &hose->mem_resources[i]; if (!res->flags) { if (i > 0) continue; printk(KERN_ERR "Memory resource not set for " "host bridge %d\n", hose->global_number); res->start = hose->pci_mem_offset; res->end = ~0U; res->flags = IORESOURCE_MEM; } bus->resource[i+1] = res; } } } /* the next one is stolen from the alpha port... */ void __init pcibios_update_irq(struct pci_dev *dev, int irq) { pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq); /* XXX FIXME - update OF device tree node interrupt property */ } 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; } unsigned long pci_address_to_pio(phys_addr_t address) { struct pci_controller *hose, *tmp; list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { unsigned int size = hose->io_resource.end - hose->io_resource.start + 1; if (address >= hose->io_base_phys && address < (hose->io_base_phys + size)) { unsigned long base = (unsigned long)hose->io_base_virt - _IO_BASE; return base + (address - hose->io_base_phys); } } return (unsigned int)-1; } EXPORT_SYMBOL(pci_address_to_pio); /* * Null PCI config access functions, for the case when we can't * find a hose. */ #define NULL_PCI_OP(rw, size, type) \ static int \ null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \ { \ return PCIBIOS_DEVICE_NOT_FOUND; \ } static int null_read_config(struct pci_bus *bus, unsigned int devfn, int offset, int len, u32 *val) { return PCIBIOS_DEVICE_NOT_FOUND; } static int null_write_config(struct pci_bus *bus, unsigned int devfn, int offset, int len, u32 val) { return PCIBIOS_DEVICE_NOT_FOUND; } static struct pci_ops null_pci_ops = { .read = null_read_config, .write = null_write_config, }; /* * These functions are used early on before PCI scanning is done * and all of the pci_dev and pci_bus structures have been created. */ static struct pci_bus * fake_pci_bus(struct pci_controller *hose, int busnr) { static struct pci_bus bus; if (hose == 0) { hose = pci_bus_to_hose(busnr); if (hose == 0) printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr); } bus.number = busnr; bus.sysdata = hose; bus.ops = hose? hose->ops: &null_pci_ops; return &bus; } #define EARLY_PCI_OP(rw, size, type) \ int early_##rw##_config_##size(struct pci_controller *hose, int bus, \ int devfn, int offset, type value) \ { \ return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \ devfn, offset, value); \ } EARLY_PCI_OP(read, byte, u8 *) EARLY_PCI_OP(read, word, u16 *) EARLY_PCI_OP(read, dword, u32 *) EARLY_PCI_OP(write, byte, u8) EARLY_PCI_OP(write, word, u16) EARLY_PCI_OP(write, dword, u32) extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap); int early_find_capability(struct pci_controller *hose, int bus, int devfn, int cap) { return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap); }