MV_INT_CAUSE2
cause2 = pci_dw_dbi_rd4(sc->dev, MV_INT_CAUSE2);
pci_dw_dbi_wr4(sc->dev, MV_INT_CAUSE2, cause2);
pci_dw_dbi_wr4(sc->dev, MV_INT_CAUSE2, 0xFFFFFFFF);
cause2 = pci_dw_dbi_rd4(sc->dev, MV_INT_CAUSE2);
pci_dw_dbi_wr4(sc->dev, MV_INT_CAUSE2, cause2);