| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 1 | /* |
| 2 | * PCI <-> OF mapping helpers |
| 3 | * |
| 4 | * Copyright 2011 IBM Corp. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/irqdomain.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/pci.h> |
| 15 | #include <linux/of.h> |
| 16 | #include <linux/of_irq.h> |
| 17 | #include <linux/of_pci.h> |
| 18 | #include "pci.h" |
| 19 | |
| 20 | void pci_set_of_node(struct pci_dev *dev) |
| 21 | { |
| 22 | if (!dev->bus->dev.of_node) |
| 23 | return; |
| 24 | dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node, |
| 25 | dev->devfn); |
| 26 | } |
| 27 | |
| 28 | void pci_release_of_node(struct pci_dev *dev) |
| 29 | { |
| 30 | of_node_put(dev->dev.of_node); |
| 31 | dev->dev.of_node = NULL; |
| 32 | } |
| 33 | |
| 34 | void pci_set_bus_of_node(struct pci_bus *bus) |
| 35 | { |
| 36 | if (bus->self == NULL) |
| 37 | bus->dev.of_node = pcibios_get_phb_of_node(bus); |
| 38 | else |
| 39 | bus->dev.of_node = of_node_get(bus->self->dev.of_node); |
| 40 | } |
| 41 | |
| 42 | void pci_release_bus_of_node(struct pci_bus *bus) |
| 43 | { |
| 44 | of_node_put(bus->dev.of_node); |
| 45 | bus->dev.of_node = NULL; |
| 46 | } |
| 47 | |
| 48 | struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus) |
| 49 | { |
| 50 | /* This should only be called for PHBs */ |
| 51 | if (WARN_ON(bus->self || bus->parent)) |
| 52 | return NULL; |
| 53 | |
| 54 | /* Look for a node pointer in either the intermediary device we |
| 55 | * create above the root bus or it's own parent. Normally only |
| 56 | * the later is populated. |
| 57 | */ |
| 58 | if (bus->bridge->of_node) |
| 59 | return of_node_get(bus->bridge->of_node); |
| 60 | if (bus->bridge->parent && bus->bridge->parent->of_node) |
| 61 | return of_node_get(bus->bridge->parent->of_node); |
| 62 | return NULL; |
| 63 | } |
| 64 | |
| 65 | struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus) |
| 66 | { |
| 67 | #ifdef CONFIG_IRQ_DOMAIN |
| 68 | struct irq_domain *d; |
| 69 | |
| 70 | if (!bus->dev.of_node) |
| 71 | return NULL; |
| 72 | |
| 73 | /* Start looking for a phandle to an MSI controller. */ |
| 74 | d = of_msi_get_domain(&bus->dev, bus->dev.of_node, DOMAIN_BUS_PCI_MSI); |
| 75 | if (d) |
| 76 | return d; |
| 77 | |
| 78 | /* |
| 79 | * If we don't have an msi-parent property, look for a domain |
| 80 | * directly attached to the host bridge. |
| 81 | */ |
| 82 | d = irq_find_matching_host(bus->dev.of_node, DOMAIN_BUS_PCI_MSI); |
| 83 | if (d) |
| 84 | return d; |
| 85 | |
| 86 | return irq_find_host(bus->dev.of_node); |
| 87 | #else |
| 88 | return NULL; |
| 89 | #endif |
| 90 | } |