CN6XXX_SLI_S2M_PORTX_CTL
r64 = octeon_read_csr64(oct, CN6XXX_SLI_S2M_PORTX_CTL(oct->pcie_port));
octeon_write_csr64(oct, CN6XXX_SLI_S2M_PORTX_CTL(oct->pcie_port), r64);