IOAT_INTRCTRL_OFFSET
writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET);
writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET);
intrctrl = readb(instance->reg_base + IOAT_INTRCTRL_OFFSET);
writeb(intrctrl, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
writeb(intrctrl, device->bars[0].vaddr + IOAT_INTRCTRL_OFFSET);