diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/cpu/pci.c | 21 | ||||
| -rw-r--r-- | arch/x86/include/asm/pci.h | 14 |
2 files changed, 35 insertions, 0 deletions
diff --git a/arch/x86/cpu/pci.c b/arch/x86/cpu/pci.c index e23b233..c209f15 100644 --- 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); +} diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h index a1969ed..56eaa25 100644 --- a/arch/x86/include/asm/pci.h +++ b/arch/x86/include/asm/pci.h @@ -64,6 +64,20 @@ int pci_x86_read_config(struct udevice *bus, pci_dev_t bdf, uint offset, int pci_x86_write_config(struct udevice *bus, pci_dev_t bdf, uint offset, ulong value, enum pci_size_t size); +/** + * Assign IRQ number to a PCI device + * + * This function assigns IRQ for a PCI device. If the device does not exist + * or does not require interrupts then this function has no effect. + * + * @bus: PCI bus number + * @device: PCI device number + * @func: PCI function number + * @irq: An array of IRQ numbers that are assigned to INTA through + * INTD of this PCI device. + */ +void pci_assign_irqs(int bus, int device, int func, u8 irq[4]); + #endif /* __ASSEMBLY__ */ #endif /* _PCI_I386_H_ */ |