IMGU_PCI_BAR
phys = pci_resource_start(pci_dev, IMGU_PCI_BAR);
phys_len = pci_resource_len(pci_dev, IMGU_PCI_BAR);
r = pcim_iomap_regions(pci_dev, 1 << IMGU_PCI_BAR, pci_name(pci_dev));
imgu->base = iomap[IMGU_PCI_BAR];