/* * Helper routines to scan the device tree for PCI devices and busses * * Migrated out of PowerPC architecture pci_64.c file by Grant Likely * so that these routines are available for * 32 bit also. * * Copyright (C) 2003 Anton Blanchard , IBM * Rework, based on alpha PCI code. * Copyright (c) 2009 Secret Lab Technologies Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. */ #include #include #include #include /** * get_int_prop - Decode a u32 from a device tree property */ static u32 get_int_prop(struct device_node *np, const char *name, u32 def) { const __be32 *prop; int len; prop = of_get_property(np, name, &len); if (prop && len >= 4) return of_read_number(prop, 1); return def; } /** * pci_parse_of_flags - Parse the flags cell of a device tree PCI address * @addr0: value of 1st cell of a device tree PCI address. * @bridge: Set this flag if the address is from a bridge 'ranges' property */ static unsigned int pci_parse_of_flags(u32 addr0, int bridge) { 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; /* Note: We don't know whether the ROM has been left enabled * by the firmware or not. We mark it as disabled (ie, we do * not set the IORESOURCE_ROM_ENABLE flag) for now rather than * do a config space read, it will be force-enabled if needed */ if (!bridge && (addr0 & 0xff) == 0x30) flags |= IORESOURCE_READONLY; } else if (addr0 & 0x01000000) flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO; if (flags) flags |= IORESOURCE_SIZEALIGN; return flags; } /** * of_pci_parse_addrs - Parse PCI addresses assigned in the device tree node * @node: device tree node for the PCI device * @dev: pci_dev structure for the device * * This function parses the 'assigned-addresses' property of a PCI devices' * device tree node and writes them into the associated pci_dev structure. */ static void of_pci_parse_addrs(struct device_node *node, struct pci_dev *dev) { u64 base, size; unsigned int flags; struct pci_bus_region region; struct resource *res; const __be32 *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(of_read_number(addrs, 1), 0); if (!flags) continue; base = of_read_number(&addrs[1], 2); size = of_read_number(&addrs[3], 2); if (!size) continue; i = of_read_number(addrs, 1) & 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->flags = flags; res->name = pci_name(dev); region.start = base; region.end = base + size - 1; pcibios_bus_to_resource(dev->bus, res, ®ion); } } /** * of_create_pci_dev - Given a device tree node on a pci bus, create a pci_dev * @node: device tree node pointer * @bus: bus the device is sitting on * @devfn: PCI function number, extracted from device tree by caller. */ 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 = pci_alloc_dev(bus); 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->dev.of_node = of_node_get(node); dev->dev.parent = bus->bridge; dev->dev.bus = &pci_bus_type; dev->devfn = devfn; dev->multifunction = 0; /* maybe a lie? */ dev->needs_freset = 0; /* pcie fundamental reset required */ set_pcie_port_type(dev); pci_dev_assign_slot(dev); 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 = PCI_UNKNOWN; /* unknown power state */ dev->error_state = pci_channel_io_normal; dev->dma_mask = 0xffffffff; /* Early fixups, before probing the BARs */ pci_fixup_device(pci_fixup_early, dev); 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; set_pcie_hotplug_bridge(dev); } 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; } of_pci_parse_addrs(node, dev); pr_debug(" adding to system ...\n"); pci_device_add(dev, bus); return dev; } EXPORT_SYMBOL(of_create_pci_dev); /** * of_scan_pci_bridge - Set up a PCI bridge and scan for child nodes * @dev: pci_dev structure for the bridge * * of_scan_bus() calls this routine for each PCI bridge that it finds, and * this routine in turn call of_scan_bus() recusively to scan for more child * devices. */ void of_scan_pci_bridge(struct pci_dev *dev) { struct device_node *node = dev->dev.of_node; struct pci_bus *bus; struct pci_controller *phb; const __be32 *busrange, *ranges; int len, i, mode; struct pci_bus_region region; 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_find_bus(pci_domain_nr(dev->bus), of_read_number(busrange, 1)); if (!bus) { bus = pci_add_new_bus(dev->bus, dev, of_read_number(busrange, 1)); if (!bus) { printk(KERN_ERR "Failed to create pci bus for %s\n", node->full_name); return; } } bus->primary = dev->bus->number; pci_bus_insert_busn_res(bus, of_read_number(busrange, 1), of_read_number(busrange+1, 1)); bus->bridge_ctl = 0; /* 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(of_read_number(ranges, 1), 1); 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->flags = flags; region.start = of_read_number(&ranges[1], 2); region.end = region.start + size - 1; pcibios_bus_to_resource(dev->bus, res, ®ion); } sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus), bus->number); pr_debug(" bus name: %s\n", bus->name); phb = pci_bus_to_host(bus); mode = PCI_PROBE_NORMAL; if (phb->controller_ops.probe_mode) mode = phb->controller_ops.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); static struct pci_dev *of_scan_pci_dev(struct pci_bus *bus, struct device_node *dn) { struct pci_dev *dev = NULL; const __be32 *reg; int reglen, devfn; #ifdef CONFIG_EEH struct eeh_dev *edev = pdn_to_eeh_dev(PCI_DN(dn)); #endif pr_debug(" * %s\n", dn->full_name); if (!of_device_is_available(dn)) return NULL; reg = of_get_property(dn, "reg", ®len); if (reg == NULL || reglen < 20) return NULL; devfn = (of_read_number(reg, 1) >> 8) & 0xff; /* Check if the PCI device is already there */ dev = pci_get_slot(bus, devfn); if (dev) { pci_dev_put(dev); return dev; } /* Device removed permanently ? */ #ifdef CONFIG_EEH if (edev && (edev->mode & EEH_DEV_REMOVED)) return NULL; #endif /* create a new pci_dev for this device */ dev = of_create_pci_dev(dn, bus, devfn); if (!dev) return NULL; pr_debug(" dev header type: %x\n", dev->hdr_type); return dev; } /** * __of_scan_bus - given a PCI bus node, setup bus and scan for child devices * @node: device tree node for the PCI bus * @bus: pci_bus structure for the PCI bus * @rescan_existing: Flag indicating bus has already been set up */ static void __of_scan_bus(struct device_node *node, struct pci_bus *bus, int rescan_existing) { struct device_node *child; 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) { dev = of_scan_pci_dev(bus, child); 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 (pci_is_bridge(dev)) { of_scan_pci_bridge(dev); } } } /** * of_scan_bus - given a PCI bus node, setup bus and scan for child devices * @node: device tree node for the PCI bus * @bus: pci_bus structure for the PCI bus */ void of_scan_bus(struct device_node *node, struct pci_bus *bus) { __of_scan_bus(node, bus, 0); } EXPORT_SYMBOL_GPL(of_scan_bus); /** * of_rescan_bus - given a PCI bus node, scan for child devices * @node: device tree node for the PCI bus * @bus: pci_bus structure for the PCI bus * * Same as of_scan_bus, but for a pci_bus structure that has already been * setup. */ void of_rescan_bus(struct device_node *node, struct pci_bus *bus) { __of_scan_bus(node, bus, 1); } EXPORT_SYMBOL_GPL(of_rescan_bus);