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204d49a5 BH |
1 | /* |
2 | * IOAPIC/IOxAPIC/IOSAPIC driver | |
3 | * | |
4 | * Copyright (C) 2009 Fujitsu Limited. | |
5 | * (c) Copyright 2009 Hewlett-Packard Development Company, L.P. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | /* | |
13 | * This driver manages PCI I/O APICs added by hotplug after boot. We try to | |
14 | * claim all I/O APIC PCI devices, but those present at boot were registered | |
15 | * when we parsed the ACPI MADT, so we'll fail when we try to re-register | |
16 | * them. | |
17 | */ | |
18 | ||
19 | #include <linux/pci.h> | |
b95a7bd7 | 20 | #include <linux/module.h> |
204d49a5 | 21 | #include <linux/acpi.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
204d49a5 BH |
23 | |
24 | struct ioapic { | |
25 | acpi_handle handle; | |
26 | u32 gsi_base; | |
27 | }; | |
28 | ||
15856ad5 | 29 | static int ioapic_probe(struct pci_dev *dev, const struct pci_device_id *ent) |
204d49a5 BH |
30 | { |
31 | acpi_handle handle; | |
32 | acpi_status status; | |
33 | unsigned long long gsb; | |
34 | struct ioapic *ioapic; | |
204d49a5 BH |
35 | int ret; |
36 | char *type; | |
e1944c6b | 37 | struct resource *res; |
204d49a5 | 38 | |
3a83f992 | 39 | handle = ACPI_HANDLE(&dev->dev); |
204d49a5 BH |
40 | if (!handle) |
41 | return -EINVAL; | |
42 | ||
43 | status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); | |
44 | if (ACPI_FAILURE(status)) | |
45 | return -EINVAL; | |
46 | ||
47 | /* | |
48 | * The previous code in acpiphp evaluated _MAT if _GSB failed, but | |
49 | * ACPI spec 4.0 sec 6.2.2 requires _GSB for hot-pluggable I/O APICs. | |
50 | */ | |
51 | ||
52 | ioapic = kzalloc(sizeof(*ioapic), GFP_KERNEL); | |
53 | if (!ioapic) | |
54 | return -ENOMEM; | |
55 | ||
56 | ioapic->handle = handle; | |
57 | ioapic->gsi_base = (u32) gsb; | |
58 | ||
59 | if (dev->class == PCI_CLASS_SYSTEM_PIC_IOAPIC) | |
60 | type = "IOAPIC"; | |
61 | else | |
62 | type = "IOxAPIC"; | |
63 | ||
64 | ret = pci_enable_device(dev); | |
65 | if (ret < 0) | |
66 | goto exit_free; | |
67 | ||
68 | pci_set_master(dev); | |
69 | ||
70 | if (pci_request_region(dev, 0, type)) | |
71 | goto exit_disable; | |
72 | ||
e1944c6b BH |
73 | res = &dev->resource[0]; |
74 | if (acpi_register_ioapic(ioapic->handle, res->start, ioapic->gsi_base)) | |
204d49a5 BH |
75 | goto exit_release; |
76 | ||
77 | pci_set_drvdata(dev, ioapic); | |
e1944c6b | 78 | dev_info(&dev->dev, "%s at %pR, GSI %u\n", type, res, ioapic->gsi_base); |
204d49a5 BH |
79 | return 0; |
80 | ||
81 | exit_release: | |
82 | pci_release_region(dev, 0); | |
83 | exit_disable: | |
84 | pci_disable_device(dev); | |
85 | exit_free: | |
86 | kfree(ioapic); | |
87 | return -ENODEV; | |
88 | } | |
89 | ||
15856ad5 | 90 | static void ioapic_remove(struct pci_dev *dev) |
204d49a5 BH |
91 | { |
92 | struct ioapic *ioapic = pci_get_drvdata(dev); | |
93 | ||
94 | acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base); | |
95 | pci_release_region(dev, 0); | |
96 | pci_disable_device(dev); | |
97 | kfree(ioapic); | |
98 | } | |
99 | ||
100 | ||
b95a7bd7 JB |
101 | static DEFINE_PCI_DEVICE_TABLE(ioapic_devices) = { |
102 | { PCI_DEVICE_CLASS(PCI_CLASS_SYSTEM_PIC_IOAPIC, ~0) }, | |
103 | { PCI_DEVICE_CLASS(PCI_CLASS_SYSTEM_PIC_IOXAPIC, ~0) }, | |
204d49a5 BH |
104 | { } |
105 | }; | |
b95a7bd7 | 106 | MODULE_DEVICE_TABLE(pci, ioapic_devices); |
204d49a5 BH |
107 | |
108 | static struct pci_driver ioapic_driver = { | |
109 | .name = "ioapic", | |
110 | .id_table = ioapic_devices, | |
111 | .probe = ioapic_probe, | |
15856ad5 | 112 | .remove = ioapic_remove, |
204d49a5 BH |
113 | }; |
114 | ||
77410439 YL |
115 | static int __init ioapic_init(void) |
116 | { | |
117 | return pci_register_driver(&ioapic_driver); | |
118 | } | |
119 | module_init(ioapic_init); | |
eba48cd0 AC |
120 | |
121 | MODULE_LICENSE("GPL"); |