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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> | |
20 | #include <linux/acpi.h> | |
21 | #include <acpi/acpi_bus.h> | |
22 | ||
23 | struct ioapic { | |
24 | acpi_handle handle; | |
25 | u32 gsi_base; | |
26 | }; | |
27 | ||
28 | static int ioapic_probe(struct pci_dev *dev, const struct pci_device_id *ent) | |
29 | { | |
30 | acpi_handle handle; | |
31 | acpi_status status; | |
32 | unsigned long long gsb; | |
33 | struct ioapic *ioapic; | |
204d49a5 BH |
34 | int ret; |
35 | char *type; | |
e1944c6b | 36 | struct resource *res; |
204d49a5 BH |
37 | |
38 | handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
39 | if (!handle) | |
40 | return -EINVAL; | |
41 | ||
42 | status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); | |
43 | if (ACPI_FAILURE(status)) | |
44 | return -EINVAL; | |
45 | ||
46 | /* | |
47 | * The previous code in acpiphp evaluated _MAT if _GSB failed, but | |
48 | * ACPI spec 4.0 sec 6.2.2 requires _GSB for hot-pluggable I/O APICs. | |
49 | */ | |
50 | ||
51 | ioapic = kzalloc(sizeof(*ioapic), GFP_KERNEL); | |
52 | if (!ioapic) | |
53 | return -ENOMEM; | |
54 | ||
55 | ioapic->handle = handle; | |
56 | ioapic->gsi_base = (u32) gsb; | |
57 | ||
58 | if (dev->class == PCI_CLASS_SYSTEM_PIC_IOAPIC) | |
59 | type = "IOAPIC"; | |
60 | else | |
61 | type = "IOxAPIC"; | |
62 | ||
63 | ret = pci_enable_device(dev); | |
64 | if (ret < 0) | |
65 | goto exit_free; | |
66 | ||
67 | pci_set_master(dev); | |
68 | ||
69 | if (pci_request_region(dev, 0, type)) | |
70 | goto exit_disable; | |
71 | ||
e1944c6b BH |
72 | res = &dev->resource[0]; |
73 | if (acpi_register_ioapic(ioapic->handle, res->start, ioapic->gsi_base)) | |
204d49a5 BH |
74 | goto exit_release; |
75 | ||
76 | pci_set_drvdata(dev, ioapic); | |
e1944c6b | 77 | dev_info(&dev->dev, "%s at %pR, GSI %u\n", type, res, ioapic->gsi_base); |
204d49a5 BH |
78 | return 0; |
79 | ||
80 | exit_release: | |
81 | pci_release_region(dev, 0); | |
82 | exit_disable: | |
83 | pci_disable_device(dev); | |
84 | exit_free: | |
85 | kfree(ioapic); | |
86 | return -ENODEV; | |
87 | } | |
88 | ||
89 | static void ioapic_remove(struct pci_dev *dev) | |
90 | { | |
91 | struct ioapic *ioapic = pci_get_drvdata(dev); | |
92 | ||
93 | acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base); | |
94 | pci_release_region(dev, 0); | |
95 | pci_disable_device(dev); | |
96 | kfree(ioapic); | |
97 | } | |
98 | ||
99 | ||
100 | static struct pci_device_id ioapic_devices[] = { | |
101 | { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, | |
102 | PCI_CLASS_SYSTEM_PIC_IOAPIC << 8, 0xffff00, }, | |
103 | { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, | |
104 | PCI_CLASS_SYSTEM_PIC_IOXAPIC << 8, 0xffff00, }, | |
105 | { } | |
106 | }; | |
107 | ||
108 | static struct pci_driver ioapic_driver = { | |
109 | .name = "ioapic", | |
110 | .id_table = ioapic_devices, | |
111 | .probe = ioapic_probe, | |
112 | .remove = __devexit_p(ioapic_remove), | |
113 | }; | |
114 | ||
115 | static int __init ioapic_init(void) | |
116 | { | |
117 | return pci_register_driver(&ioapic_driver); | |
118 | } | |
119 | ||
120 | static void __exit ioapic_exit(void) | |
121 | { | |
122 | pci_unregister_driver(&ioapic_driver); | |
123 | } | |
124 | ||
125 | module_init(ioapic_init); | |
126 | module_exit(ioapic_exit); |