127 lines
2.8 KiB
C
127 lines
2.8 KiB
C
/*
|
|
* IOAPIC/IOxAPIC/IOSAPIC driver
|
|
*
|
|
* Copyright (C) 2009 Fujitsu Limited.
|
|
* (c) Copyright 2009 Hewlett-Packard Development Company, L.P.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
/*
|
|
* This driver manages PCI I/O APICs added by hotplug after boot. We try to
|
|
* claim all I/O APIC PCI devices, but those present at boot were registered
|
|
* when we parsed the ACPI MADT, so we'll fail when we try to re-register
|
|
* them.
|
|
*/
|
|
|
|
#include <linux/pci.h>
|
|
#include <linux/acpi.h>
|
|
#include <acpi/acpi_bus.h>
|
|
|
|
struct ioapic {
|
|
acpi_handle handle;
|
|
u32 gsi_base;
|
|
};
|
|
|
|
static int ioapic_probe(struct pci_dev *dev, const struct pci_device_id *ent)
|
|
{
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
unsigned long long gsb;
|
|
struct ioapic *ioapic;
|
|
int ret;
|
|
char *type;
|
|
struct resource *res;
|
|
|
|
handle = DEVICE_ACPI_HANDLE(&dev->dev);
|
|
if (!handle)
|
|
return -EINVAL;
|
|
|
|
status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
|
|
if (ACPI_FAILURE(status))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* The previous code in acpiphp evaluated _MAT if _GSB failed, but
|
|
* ACPI spec 4.0 sec 6.2.2 requires _GSB for hot-pluggable I/O APICs.
|
|
*/
|
|
|
|
ioapic = kzalloc(sizeof(*ioapic), GFP_KERNEL);
|
|
if (!ioapic)
|
|
return -ENOMEM;
|
|
|
|
ioapic->handle = handle;
|
|
ioapic->gsi_base = (u32) gsb;
|
|
|
|
if (dev->class == PCI_CLASS_SYSTEM_PIC_IOAPIC)
|
|
type = "IOAPIC";
|
|
else
|
|
type = "IOxAPIC";
|
|
|
|
ret = pci_enable_device(dev);
|
|
if (ret < 0)
|
|
goto exit_free;
|
|
|
|
pci_set_master(dev);
|
|
|
|
if (pci_request_region(dev, 0, type))
|
|
goto exit_disable;
|
|
|
|
res = &dev->resource[0];
|
|
if (acpi_register_ioapic(ioapic->handle, res->start, ioapic->gsi_base))
|
|
goto exit_release;
|
|
|
|
pci_set_drvdata(dev, ioapic);
|
|
dev_info(&dev->dev, "%s at %pR, GSI %u\n", type, res, ioapic->gsi_base);
|
|
return 0;
|
|
|
|
exit_release:
|
|
pci_release_region(dev, 0);
|
|
exit_disable:
|
|
pci_disable_device(dev);
|
|
exit_free:
|
|
kfree(ioapic);
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void ioapic_remove(struct pci_dev *dev)
|
|
{
|
|
struct ioapic *ioapic = pci_get_drvdata(dev);
|
|
|
|
acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base);
|
|
pci_release_region(dev, 0);
|
|
pci_disable_device(dev);
|
|
kfree(ioapic);
|
|
}
|
|
|
|
|
|
static struct pci_device_id ioapic_devices[] = {
|
|
{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
|
|
PCI_CLASS_SYSTEM_PIC_IOAPIC << 8, 0xffff00, },
|
|
{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
|
|
PCI_CLASS_SYSTEM_PIC_IOXAPIC << 8, 0xffff00, },
|
|
{ }
|
|
};
|
|
|
|
static struct pci_driver ioapic_driver = {
|
|
.name = "ioapic",
|
|
.id_table = ioapic_devices,
|
|
.probe = ioapic_probe,
|
|
.remove = __devexit_p(ioapic_remove),
|
|
};
|
|
|
|
static int __init ioapic_init(void)
|
|
{
|
|
return pci_register_driver(&ioapic_driver);
|
|
}
|
|
|
|
static void __exit ioapic_exit(void)
|
|
{
|
|
pci_unregister_driver(&ioapic_driver);
|
|
}
|
|
|
|
module_init(ioapic_init);
|
|
module_exit(ioapic_exit);
|