1 #include <linux/pci.h>
2 #include <linux/acpi.h>
3 #include <linux/init.h>
4 #include <linux/irq.h>
5 #include <asm/hw_irq.h>
6 #include "pci.h"
7
8 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
9 {
10 if (domain != 0) {
11 printk(KERN_WARNING "PCI: Multiple domains not supported\n");
12 return NULL;
13 }
14
15 return pcibios_scan_root(busnum);
16 }
17
18 extern int pci_routeirq;
19 static int __init pci_acpi_init(void)
20 {
21 struct pci_dev *dev = NULL;
22
23 if (pcibios_scanned)
24 return 0;
25
26 if (acpi_noirq)
27 return 0;
28
29 printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
30 acpi_irq_penalty_init();
31 pcibios_scanned++;
32 pcibios_enable_irq = acpi_pci_irq_enable;
33
34 if (pci_routeirq) {
35 /*
36 * PCI IRQ routing is set up by pci_enable_device(), but we
37 * also do it here in case there are still broken drivers that
38 * don't use pci_enable_device().
39 */
40 printk(KERN_INFO "** Routing PCI interrupts for all devices because \"pci=routeirq\"\n");
41 printk(KERN_INFO "** was specified. If this was required to make a driver work,\n");
42 printk(KERN_INFO "** please email the output of \"lspci\" to bjorn.helgaas@hp.com\n");
43 printk(KERN_INFO "** so I can fix the driver.\n");
44 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL)
45 acpi_pci_irq_enable(dev);
46 } else {
47 printk(KERN_INFO "** PCI interrupts are no longer routed automatically. If this\n");
48 printk(KERN_INFO "** causes a device to stop working, it is probably because the\n");
49 printk(KERN_INFO "** driver failed to call pci_enable_device(). As a temporary\n");
50 printk(KERN_INFO "** workaround, the \"pci=routeirq\" argument restores the old\n");
51 printk(KERN_INFO "** behavior. If this argument makes the device work again,\n");
52 printk(KERN_INFO "** please email the output of \"lspci\" to bjorn.helgaas@hp.com\n");
53 printk(KERN_INFO "** so I can fix the driver.\n");
54 }
55 #ifdef CONFIG_X86_IO_APIC
56 if (acpi_ioapic)
57 print_IO_APIC();
58 #endif
59
60 return 0;
61 }
62 subsys_initcall(pci_acpi_init);
63
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