PCIETCTLR
rcar_pci_write_reg(pcie, 0, PCIETCTLR);
rcar_pci_write_reg(&ep->pcie, CFINIT, PCIETCTLR);
rcar_pci_write_reg(&ep->pcie, 0, PCIETCTLR);
!(rcar_pci_read_reg(pcie, PCIETCTLR) & DL_DOWN))
rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
rcar_pci_write_reg(pcie, 0, PCIETCTLR);
rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);