static void iommu_bus_setup_pSeries(struct pci_bus *bus) { struct device_node *dn; struct iommu_table *tbl; struct device_node *isa_dn, *isa_dn_orig; struct device_node *tmp; struct pci_dn *pci; int children; DBG("iommu_bus_setup_pSeries, bus %p, bus->self %p\n", bus, bus->self); dn = pci_bus_to_OF_node(bus); pci = PCI_DN(dn); if (bus->self) { /* This is not a root bus, any setup will be done for the * device-side of the bridge in iommu_dev_setup_pSeries(). */ return; } /* Check if the ISA bus on the system is under * this PHB. */ isa_dn = isa_dn_orig = of_find_node_by_type(NULL, "isa"); while (isa_dn && isa_dn != dn) isa_dn = isa_dn->parent; if (isa_dn_orig) of_node_put(isa_dn_orig); /* Count number of direct PCI children of the PHB. * All PCI device nodes have class-code property, so it's * an easy way to find them. */ for (children = 0, tmp = dn->child; tmp; tmp = tmp->sibling) if (get_property(tmp, "class-code", NULL)) children++; DBG("Children: %d\n", children); /* Calculate amount of DMA window per slot. Each window must be * a power of two (due to pci_alloc_consistent requirements). * * Keep 256MB aside for PHBs with ISA. */ if (!isa_dn) { /* No ISA/IDE - just set window size and return */ pci->phb->dma_window_size = 0x80000000ul; /* To be divided */ while (pci->phb->dma_window_size * children > 0x80000000ul) pci->phb->dma_window_size >>= 1; DBG("No ISA/IDE, window size is 0x%lx\n", pci->phb->dma_window_size); pci->phb->dma_window_base_cur = 0; return; }
static int rtas_pci_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { struct device_node *busdn, *dn; busdn = pci_bus_to_OF_node(bus); /* Search only direct children of the bus */ for (dn = busdn->child; dn; dn = dn->sibling) { struct pci_dn *pdn = PCI_DN(dn); if (pdn && pdn->devfn == devfn && of_device_is_available(dn)) return rtas_write_config(pdn, where, size, val); } return PCIBIOS_DEVICE_NOT_FOUND; }
int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq) { struct device_node *dn, *ppnode; struct pci_dev *ppdev; u32 lspec; u32 laddr[3]; u8 pin; int rc; /* Check if we have a device node, if yes, fallback to standard OF * parsing */ dn = pci_device_to_OF_node(pdev); if (dn) return of_irq_map_one(dn, 0, out_irq); /* Ok, we don't, time to have fun. Let's start by building up an * interrupt spec. we assume #interrupt-cells is 1, which is standard * for PCI. If you do different, then don't use that routine. */ rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin); if (rc != 0) return rc; /* No pin, exit */ if (pin == 0) return -ENODEV; /* Now we walk up the PCI tree */ lspec = pin; for (;;) { /* Get the pci_dev of our parent */ ppdev = pdev->bus->self; /* Ouch, it's a host bridge... */ if (ppdev == NULL) { #ifdef CONFIG_PPC64 ppnode = pci_bus_to_OF_node(pdev->bus); #else struct pci_controller *host; host = pci_bus_to_host(pdev->bus); ppnode = host ? host->arch_data : NULL; #endif /* No node for host bridge ? give up */ if (ppnode == NULL) return -EINVAL; } else /* We found a P2P bridge, check if it has a node */ ppnode = pci_device_to_OF_node(ppdev); /* Ok, we have found a parent with a device-node, hand over to * the OF parsing code. * We build a unit address from the linux device to be used for * resolution. Note that we use the linux bus number which may * not match your firmware bus numbering. * Fortunately, in most cases, interrupt-map-mask doesn't include * the bus number as part of the matching. * You should still be careful about that though if you intend * to rely on this function (you ship a firmware that doesn't * create device nodes for all PCI devices). */ if (ppnode) break; /* We can only get here if we hit a P2P bridge with no node, * let's do standard swizzling and try again */ lspec = of_irq_pci_swizzle(PCI_SLOT(pdev->devfn), lspec); pdev = ppdev; } laddr[0] = (pdev->bus->number << 16) | (pdev->devfn << 8); laddr[1] = laddr[2] = 0; return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq); }
/** * of_irq_parse_pci - Resolve the interrupt for a PCI device * @pdev: the device whose interrupt is to be resolved * @out_irq: structure of_irq filled by this function * * This function resolves the PCI interrupt for a given PCI device. If a * device-node exists for a given pci_dev, it will use normal OF tree * walking. If not, it will implement standard swizzling and walk up the * PCI tree until an device-node is found, at which point it will finish * resolving using the OF tree walking. */ int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq) { struct device_node *dn, *ppnode; struct pci_dev *ppdev; __be32 laddr[3]; u8 pin; int rc; /* Check if we have a device node, if yes, fallback to standard * device tree parsing */ dn = pci_device_to_OF_node(pdev); if (dn) { rc = of_irq_parse_one(dn, 0, out_irq); if (!rc) return rc; } /* Ok, we don't, time to have fun. Let's start by building up an * interrupt spec. we assume #interrupt-cells is 1, which is standard * for PCI. If you do different, then don't use that routine. */ rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin); if (rc != 0) goto err; /* No pin, exit with no error message. */ if (pin == 0) return -ENODEV; /* Now we walk up the PCI tree */ for (;;) { /* Get the pci_dev of our parent */ ppdev = pdev->bus->self; /* Ouch, it's a host bridge... */ if (ppdev == NULL) { ppnode = pci_bus_to_OF_node(pdev->bus); /* No node for host bridge ? give up */ if (ppnode == NULL) { rc = -EINVAL; goto err; } } else { /* We found a P2P bridge, check if it has a node */ ppnode = pci_device_to_OF_node(ppdev); } /* Ok, we have found a parent with a device-node, hand over to * the OF parsing code. * We build a unit address from the linux device to be used for * resolution. Note that we use the linux bus number which may * not match your firmware bus numbering. * Fortunately, in most cases, interrupt-map-mask doesn't * include the bus number as part of the matching. * You should still be careful about that though if you intend * to rely on this function (you ship a firmware that doesn't * create device nodes for all PCI devices). */ if (ppnode) break; /* We can only get here if we hit a P2P bridge with no node, * let's do standard swizzling and try again */ pin = pci_swizzle_interrupt_pin(pdev, pin); pdev = ppdev; } out_irq->np = ppnode; out_irq->args_count = 1; out_irq->args[0] = pin; laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8)); laddr[1] = laddr[2] = cpu_to_be32(0); rc = of_irq_parse_raw(laddr, out_irq); if (rc) goto err; return 0; err: if (rc == -ENOENT) { dev_warn(&pdev->dev, "%s: no interrupt-map found, INTx interrupts not available\n", __func__); pr_warn_once("%s: possibly some PCI slots don't have level triggered interrupts capability\n", __func__); } else { dev_err(&pdev->dev, "%s: failed with rc=%d\n", __func__, rc); } return rc; }