1 files changed, 53 insertions, 0 deletions

diff --git a/arch/i386/pci/acpi.c b/arch/i386/pci/acpi.c
new file mode 100644
index 000000000000..2db65ec45dc3
--- /dev/null
+++ b/arch/i386/pci/acpi.c
@@ -0,0 +1,53 @@
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <asm/hw_irq.h>
+#include "pci.h"
+
+struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
+{
+        if (domain != 0) {
+                printk(KERN_WARNING "PCI: Multiple domains not supported\n");
+                return NULL;
+        }
+
+        return pcibios_scan_root(busnum);
+}
+
+extern int pci_routeirq;
+static int __init pci_acpi_init(void)
+{
+        struct pci_dev *dev = NULL;
+
+        if (pcibios_scanned)
+                return 0;
+
+        if (acpi_noirq)
+                return 0;
+
+        printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
+        acpi_irq_penalty_init();
+        pcibios_scanned++;
+        pcibios_enable_irq = acpi_pci_irq_enable;
+
+        if (pci_routeirq) {
+                /*
+                 * PCI IRQ routing is set up by pci_enable_device(), but we
+                 * also do it here in case there are still broken drivers that
+                 * don't use pci_enable_device().
+                 */
+                printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
+                while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL)
+                        acpi_pci_irq_enable(dev);
+        } else
+                printk(KERN_INFO "PCI: If a device doesn't work, try \"pci=routeirq\".  If it helps, post a report\n");
+
+#ifdef CONFIG_X86_IO_APIC
+        if (acpi_ioapic)
+                print_IO_APIC();
+#endif
+
+        return 0;
+}
+subsys_initcall(pci_acpi_init);