x86: Ignore function number when writing PIRQ routing table

[oweals/u-boot.git] / arch / x86 / cpu / pci.c

diff --git a/arch/x86/cpu/pci.c b/arch/x86/cpu/pci.c
index e23b233961cec277154b22941565990af7c87cab..c209f15ec4a8787364080467fffed562eda65cc1 100644 (file)
--- a/arch/x86/cpu/pci.c
+++ b/arch/x86/cpu/pci.c
@@ -151,3 +151,24 @@ int pci_x86_write_config(struct udevice *bus, pci_dev_t bdf, uint offset,
 
        return 0;
 }
+
+void pci_assign_irqs(int bus, int device, int func, u8 irq[4])
+{
+       pci_dev_t bdf;
+       u8 pin, line;
+
+       bdf = PCI_BDF(bus, device, func);
+
+       pin = x86_pci_read_config8(bdf, PCI_INTERRUPT_PIN);
+
+       /* PCI spec says all values except 1..4 are reserved */
+       if ((pin < 1) || (pin > 4))
+               return;
+
+       line = irq[pin - 1];
+
+       debug("Assigning IRQ %d to PCI device %d.%x.%d (INT%c)\n",
+             line, bus, device, func, 'A' + pin - 1);
+
+       x86_pci_write_config8(bdf, PCI_INTERRUPT_LINE, line);
+}