/* * Port for PPC64 David Engebretsen, IBM Corp. * Contains common pci routines for ppc64 platform, pSeries and iSeries brands. * * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM * Rework, based on alpha PCI code. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #undef DEBUG #include <linux/kernel.h> #include <linux/pci.h> #include <linux/string.h> #include <linux/init.h> #include <linux/bootmem.h> #include <linux/mm.h> #include <linux/list.h> #include <linux/syscalls.h> #include <linux/irq.h> #include <linux/vmalloc.h> #include <asm/processor.h> #include <asm/io.h> #include <asm/prom.h> #include <asm/pci-bridge.h> #include <asm/byteorder.h> #include <asm/machdep.h> #include <asm/ppc-pci.h> unsigned long pci_probe_only = 1; /* pci_io_base -- the base address from which io bars are offsets. * This is the lowest I/O base address (so bar values are always positive), * and it *must* be the start of ISA space if an ISA bus exists because * ISA drivers use hard coded offsets. If no ISA bus exists nothing * is mapped on the first 64K of IO space */ unsigned long pci_io_base = ISA_IO_BASE; EXPORT_SYMBOL(pci_io_base); 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 u32 get_int_prop(struct device_node *np, const char *name, u32 def) { const u32 *prop; int len; prop = of_get_property(np, name, &len); if (prop && len >= 4) return *prop; return def; } static unsigned int pci_parse_of_flags(u32 addr0) { unsigned int flags = 0; if (addr0 & 0x02000000) { flags = IORESOURCE_MEM | PCI_BASE_ADDRESS_SPACE_MEMORY; flags |= (addr0 >> 22) & PCI_BASE_ADDRESS_MEM_TYPE_64; flags |= (addr0 >> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M; if (addr0 & 0x40000000) flags |= IORESOURCE_PREFETCH | PCI_BASE_ADDRESS_MEM_PREFETCH; } else if (addr0 & 0x01000000) flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO; return flags; } static void pci_parse_of_addrs(struct device_node *node, struct pci_dev *dev) { u64 base, size; unsigned int flags; struct resource *res; const u32 *addrs; u32 i; int proplen; addrs = of_get_property(node, "assigned-addresses", &proplen); if (!addrs) return; pr_debug(" parse addresses (%d bytes) @ %p\n", proplen, addrs); for (; proplen >= 20; proplen -= 20, addrs += 5) { flags = pci_parse_of_flags(addrs[0]); if (!flags) continue; base = of_read_number(&addrs[1], 2); size = of_read_number(&addrs[3], 2); if (!size) continue; i = addrs[0] & 0xff; pr_debug(" base: %llx, size: %llx, i: %x\n", (unsigned long long)base, (unsigned long long)size, i); if (PCI_BASE_ADDRESS_0 <= i && i <= PCI_BASE_ADDRESS_5) { res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2]; } else if (i == dev->rom_base_reg) { res = &dev->resource[PCI_ROM_RESOURCE]; flags |= IORESOURCE_READONLY | IORESOURCE_CACHEABLE; } else { printk(KERN_ERR "PCI: bad cfg reg num 0x%x\n", i); continue; } res->start = base; res->end = base + size - 1; res->flags = flags; res->name = pci_name(dev); } } struct pci_dev *of_create_pci_dev(struct device_node *node, struct pci_bus *bus, int devfn) { struct pci_dev *dev; const char *type; dev = alloc_pci_dev(); if (!dev) return NULL; type = of_get_property(node, "device_type", NULL); if (type == NULL) type = ""; pr_debug(" create device, devfn: %x, type: %s\n", devfn, type); dev->bus = bus; dev->sysdata = node; dev->dev.parent = bus->bridge; dev->dev.bus = &pci_bus_type; dev->devfn = devfn; dev->multifunction = 0; /* maybe a lie? */ dev->vendor = get_int_prop(node, "vendor-id", 0xffff); dev->device = get_int_prop(node, "device-id", 0xffff); dev->subsystem_vendor = get_int_prop(node, "subsystem-vendor-id", 0); dev->subsystem_device = get_int_prop(node, "subsystem-id", 0); dev->cfg_size = pci_cfg_space_size(dev); dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(bus), dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn)); dev->class = get_int_prop(node, "class-code", 0); dev->revision = get_int_prop(node, "revision-id", 0); pr_debug(" class: 0x%x\n", dev->class); pr_debug(" revision: 0x%x\n", dev->revision); dev->current_state = 4; /* unknown power state */ dev->error_state = pci_channel_io_normal; dev->dma_mask = 0xffffffff; if (!strcmp(type, "pci") || !strcmp(type, "pciex")) { /* a PCI-PCI bridge */ dev->hdr_type = PCI_HEADER_TYPE_BRIDGE; dev->rom_base_reg = PCI_ROM_ADDRESS1; } else if (!strcmp(type, "cardbus")) { dev->hdr_type = PCI_HEADER_TYPE_CARDBUS; } else { dev->hdr_type = PCI_HEADER_TYPE_NORMAL; dev->rom_base_reg = PCI_ROM_ADDRESS; /* Maybe do a default OF mapping here */ dev->irq = NO_IRQ; } pci_parse_of_addrs(node, dev); pr_debug(" adding to system ...\n"); pci_device_add(dev, bus); return dev; } EXPORT_SYMBOL(of_create_pci_dev); static void __devinit __of_scan_bus(struct device_node *node, struct pci_bus *bus, int rescan_existing) { struct device_node *child; const u32 *reg; int reglen, devfn; struct pci_dev *dev; pr_debug("of_scan_bus(%s) bus no %d... \n", node->full_name, bus->number); /* Scan direct children */ for_each_child_of_node(node, child) { pr_debug(" * %s\n", child->full_name); reg = of_get_property(child, "reg", ®len); if (reg == NULL || reglen < 20) continue; devfn = (reg[0] >> 8) & 0xff; /* create a new pci_dev for this device */ dev = of_create_pci_dev(child, bus, devfn); if (!dev) continue; pr_debug(" dev header type: %x\n", dev->hdr_type); } /* Apply all fixups necessary. We don't fixup the bus "self" * for an existing bridge that is being rescanned */ if (!rescan_existing) pcibios_setup_bus_self(bus); pcibios_setup_bus_devices(bus); /* Now scan child busses */ list_for_each_entry(dev, &bus->devices, bus_list) { if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { struct device_node *child = pci_device_to_OF_node(dev); if (dev) of_scan_pci_bridge(child, dev); } } } void __devinit of_scan_bus(struct device_node *node, struct pci_bus *bus) { __of_scan_bus(node, bus, 0); } EXPORT_SYMBOL_GPL(of_scan_bus); void __devinit of_rescan_bus(struct device_node *node, struct pci_bus *bus) { __of_scan_bus(node, bus, 1); } EXPORT_SYMBOL_GPL(of_rescan_bus); void __devinit of_scan_pci_bridge(struct device_node *node, struct pci_dev *dev) { struct pci_bus *bus; const u32 *busrange, *ranges; int len, i, mode; struct resource *res; unsigned int flags; u64 size; pr_debug("of_scan_pci_bridge(%s)\n", node->full_name); /* parse bus-range property */ busrange = of_get_property(node, "bus-range", &len); if (busrange == NULL || len != 8) { printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %s\n", node->full_name); return; } ranges = of_get_property(node, "ranges", &len); if (ranges == NULL) { printk(KERN_DEBUG "Can't get ranges for PCI-PCI bridge %s\n", node->full_name); return; } bus = pci_add_new_bus(dev->bus, dev, busrange[0]); if (!bus) { printk(KERN_ERR "Failed to create pci bus for %s\n", node->full_name); return; } bus->primary = dev->bus->number; bus->subordinate = busrange[1]; bus->bridge_ctl = 0; bus->sysdata = node; /* parse ranges property */ /* PCI #address-cells == 3 and #size-cells == 2 always */ res = &dev->resource[PCI_BRIDGE_RESOURCES]; for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) { res->flags = 0; bus->resource[i] = res; ++res; } i = 1; for (; len >= 32; len -= 32, ranges += 8) { flags = pci_parse_of_flags(ranges[0]); size = of_read_number(&ranges[6], 2); if (flags == 0 || size == 0) continue; if (flags & IORESOURCE_IO) { res = bus->resource[0]; if (res->flags) { printk(KERN_ERR "PCI: ignoring extra I/O range" " for bridge %s\n", node->full_name); continue; } } else { if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) { printk(KERN_ERR "PCI: too many memory ranges" " for bridge %s\n", node->full_name); continue; } res = bus->resource[i]; ++i; } res->start = of_read_number(&ranges[1], 2); res->end = res->start + size - 1; res->flags = flags; } sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus), bus->number); pr_debug(" bus name: %s\n", bus->name); mode = PCI_PROBE_NORMAL; if (ppc_md.pci_probe_mode) mode = ppc_md.pci_probe_mode(bus); pr_debug(" probe mode: %d\n", mode); if (mode == PCI_PROBE_DEVTREE) of_scan_bus(node, bus); else if (mode == PCI_PROBE_NORMAL) pci_scan_child_bus(bus); } EXPORT_SYMBOL(of_scan_pci_bridge); void __devinit scan_phb(struct pci_controller *hose) { struct pci_bus *bus; struct device_node *node = hose->dn; int mode; 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, node); if (bus == NULL) { printk(KERN_ERR "Failed to create bus for PCI domain %04x\n", hose->global_number); return; } bus->secondary = hose->first_busno; hose->bus = bus; /* Get some IO space for the new PHB */ pcibios_map_io_space(bus); /* Wire up PHB bus resources */ pcibios_setup_phb_resources(hose); /* Get probe mode and perform scan */ mode = PCI_PROBE_NORMAL; if (node && ppc_md.pci_probe_mode) mode = ppc_md.pci_probe_mode(bus); pr_debug(" probe mode: %d\n", mode); if (mode == PCI_PROBE_DEVTREE) { bus->subordinate = hose->last_busno; of_scan_bus(node, bus); } if (mode == PCI_PROBE_NORMAL) hose->last_busno = bus->subordinate = pci_scan_child_bus(bus); } static int __init pcibios_init(void) { struct pci_controller *hose, *tmp; printk(KERN_INFO "PCI: Probing PCI hardware\n"); /* For now, override phys_mem_access_prot. If we need it,g * later, we may move that initialization to each ppc_md */ ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot; if (pci_probe_only) ppc_pci_flags |= PPC_PCI_PROBE_ONLY; /* On ppc64, we always enable PCI domains and we keep domain 0 * backward compatible in /proc for video cards */ ppc_pci_flags |= PPC_PCI_ENABLE_PROC_DOMAINS | PPC_PCI_COMPAT_DOMAIN_0; /* Scan all of the recorded PCI controllers. */ list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { scan_phb(hose); pci_bus_add_devices(hose->bus); } /* Call common code to handle resource allocation */ pcibios_resource_survey(); printk(KERN_DEBUG "PCI: Probing PCI hardware done\n"); return 0; } subsys_initcall(pcibios_init); #ifdef CONFIG_HOTPLUG int pcibios_unmap_io_space(struct pci_bus *bus) { struct pci_controller *hose; WARN_ON(bus == NULL); /* If this is not a PHB, we only flush the hash table over * the area mapped by this bridge. We don't play with the PTE * mappings since we might have to deal with sub-page alignemnts * so flushing the hash table is the only sane way to make sure * that no hash entries are covering that removed bridge area * while still allowing other busses overlapping those pages */ if (bus->self) { struct resource *res = bus->resource[0]; pr_debug("IO unmapping for PCI-PCI bridge %s\n", pci_name(bus->self)); __flush_hash_table_range(&init_mm, res->start + _IO_BASE, res->end + _IO_BASE + 1); return 0; } /* Get the host bridge */ hose = pci_bus_to_host(bus); /* Check if we have IOs allocated */ if (hose->io_base_alloc == 0) return 0; pr_debug("IO unmapping for PHB %s\n", hose->dn->full_name); pr_debug(" alloc=0x%p\n", hose->io_base_alloc); /* This is a PHB, we fully unmap the IO area */ vunmap(hose->io_base_alloc); return 0; } EXPORT_SYMBOL_GPL(pcibios_unmap_io_space); #endif /* CONFIG_HOTPLUG */ int __devinit pcibios_map_io_space(struct pci_bus *bus) { struct vm_struct *area; unsigned long phys_page; unsigned long size_page; unsigned long io_virt_offset; struct pci_controller *hose; WARN_ON(bus == NULL); /* If this not a PHB, nothing to do, page tables still exist and * thus HPTEs will be faulted in when needed */ if (bus->self) { pr_debug("IO mapping for PCI-PCI bridge %s\n", pci_name(bus->self)); pr_debug(" virt=0x%016llx...0x%016llx\n", bus->resource[0]->start + _IO_BASE, bus->resource[0]->end + _IO_BASE); return 0; } /* Get the host bridge */ hose = pci_bus_to_host(bus); phys_page = _ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE); size_page = _ALIGN_UP(hose->pci_io_size, PAGE_SIZE); /* Make sure IO area address is clear */ hose->io_base_alloc = NULL; /* If there's no IO to map on that bus, get away too */ if (hose->pci_io_size == 0 || hose->io_base_phys == 0) return 0; /* Let's allocate some IO space for that guy. We don't pass * VM_IOREMAP because we don't care about alignment tricks that * the core does in that case. Maybe we should due to stupid card * with incomplete address decoding but I'd rather not deal with * those outside of the reserved 64K legacy region. */ area = __get_vm_area(size_page, 0, PHB_IO_BASE, PHB_IO_END); if (area == NULL) return -ENOMEM; hose->io_base_alloc = area->addr; hose->io_base_virt = (void __iomem *)(area->addr + hose->io_base_phys - phys_page); pr_debug("IO mapping for PHB %s\n", hose->dn->full_name); pr_debug(" phys=0x%016llx, virt=0x%p (alloc=0x%p)\n", hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc); pr_debug(" size=0x%016lx (alloc=0x%016lx)\n", hose->pci_io_size, size_page); /* Establish the mapping */ if (__ioremap_at(phys_page, area->addr, size_page, _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL) return -ENOMEM; /* Fixup hose IO resource */ io_virt_offset = (unsigned long)hose->io_base_virt - _IO_BASE; hose->io_resource.start += io_virt_offset; hose->io_resource.end += io_virt_offset; pr_debug(" hose->io_resource=0x%016llx...0x%016llx\n", hose->io_resource.start, hose->io_resource.end); return 0; } EXPORT_SYMBOL_GPL(pcibios_map_io_space); #define IOBASE_BRIDGE_NUMBER 0 #define IOBASE_MEMORY 1 #define IOBASE_IO 2 #define IOBASE_ISA_IO 3 #define IOBASE_ISA_MEM 4 long sys_pciconfig_iobase(long which, unsigned long in_bus, unsigned long in_devfn) { struct pci_controller* hose; struct list_head *ln; struct pci_bus *bus = NULL; struct device_node *hose_node; /* Argh ! Please forgive me for that hack, but that's the * simplest way to get existing XFree to not lockup on some * G5 machines... So when something asks for bus 0 io base * (bus 0 is HT root), we return the AGP one instead. */ if (in_bus == 0 && machine_is_compatible("MacRISC4")) { struct device_node *agp; agp = of_find_compatible_node(NULL, NULL, "u3-agp"); if (agp) in_bus = 0xf0; of_node_put(agp); } /* That syscall isn't quite compatible with PCI domains, but it's * used on pre-domains setup. We return the first match */ for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) { bus = pci_bus_b(ln); if (in_bus >= bus->number && in_bus <= bus->subordinate) break; bus = NULL; } if (bus == NULL || bus->sysdata == NULL) return -ENODEV; hose_node = (struct device_node *)bus->sysdata; hose = PCI_DN(hose_node)->phb; 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 -EINVAL; } return -EOPNOTSUPP; } #ifdef CONFIG_NUMA int pcibus_to_node(struct pci_bus *bus) { struct pci_controller *phb = pci_bus_to_host(bus); return phb->node; } EXPORT_SYMBOL(pcibus_to_node); #endif