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1 | #include <linux/kernel.h> |
2 | #include <linux/of_pci.h> |
3 | #include <linux/of_irq.h> |
4 | #include <linux/export.h> |
5 | #include <asm/prom.h> |
6 | |
7 | /** |
8 | * of_irq_map_pci - Resolve the interrupt for a PCI device |
9 | * @pdev: the device whose interrupt is to be resolved |
10 | * @out_irq: structure of_irq filled by this function |
11 | * |
12 | * This function resolves the PCI interrupt for a given PCI device. If a |
13 | * device-node exists for a given pci_dev, it will use normal OF tree |
14 | * walking. If not, it will implement standard swizzling and walk up the |
15 | * PCI tree until an device-node is found, at which point it will finish |
16 | * resolving using the OF tree walking. |
17 | */ |
18 | int of_irq_map_pci(const struct pci_dev *pdev, struct of_irq *out_irq) |
19 | { |
20 | struct device_node *dn, *ppnode; |
21 | struct pci_dev *ppdev; |
22 | u32 lspec; |
23 | __be32 lspec_be; |
24 | __be32 laddr[3]; |
25 | u8 pin; |
26 | int rc; |
27 | |
28 | /* Check if we have a device node, if yes, fallback to standard |
29 | * device tree parsing |
30 | */ |
31 | dn = pci_device_to_OF_node(pdev); |
32 | if (dn) { |
33 | rc = of_irq_map_one(dn, 0, out_irq); |
34 | if (!rc) |
35 | return rc; |
36 | } |
37 | |
38 | /* Ok, we don't, time to have fun. Let's start by building up an |
39 | * interrupt spec. we assume #interrupt-cells is 1, which is standard |
40 | * for PCI. If you do different, then don't use that routine. |
41 | */ |
42 | rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin); |
43 | if (rc != 0) |
44 | return rc; |
45 | /* No pin, exit */ |
46 | if (pin == 0) |
47 | return -ENODEV; |
48 | |
49 | /* Now we walk up the PCI tree */ |
50 | lspec = pin; |
51 | for (;;) { |
52 | /* Get the pci_dev of our parent */ |
53 | ppdev = pdev->bus->self; |
54 | |
55 | /* Ouch, it's a host bridge... */ |
56 | if (ppdev == NULL) { |
57 | ppnode = pci_bus_to_OF_node(pdev->bus); |
58 | |
59 | /* No node for host bridge ? give up */ |
60 | if (ppnode == NULL) |
61 | return -EINVAL; |
62 | } else { |
63 | /* We found a P2P bridge, check if it has a node */ |
64 | ppnode = pci_device_to_OF_node(ppdev); |
65 | } |
66 | |
67 | /* Ok, we have found a parent with a device-node, hand over to |
68 | * the OF parsing code. |
69 | * We build a unit address from the linux device to be used for |
70 | * resolution. Note that we use the linux bus number which may |
71 | * not match your firmware bus numbering. |
72 | * Fortunately, in most cases, interrupt-map-mask doesn't |
73 | * include the bus number as part of the matching. |
74 | * You should still be careful about that though if you intend |
75 | * to rely on this function (you ship a firmware that doesn't |
76 | * create device nodes for all PCI devices). |
77 | */ |
78 | if (ppnode) |
79 | break; |
80 | |
81 | /* We can only get here if we hit a P2P bridge with no node, |
82 | * let's do standard swizzling and try again |
83 | */ |
84 | lspec = pci_swizzle_interrupt_pin(pdev, lspec); |
85 | pdev = ppdev; |
86 | } |
87 | |
88 | lspec_be = cpu_to_be32(lspec); |
89 | laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8)); |
90 | laddr[1] = laddr[2] = cpu_to_be32(0); |
91 | return of_irq_map_raw(ppnode, &lspec_be, 1, laddr, out_irq); |
92 | } |
93 | EXPORT_SYMBOL_GPL(of_irq_map_pci); |
94 |
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