ATMEL_PDC_RXTEN
atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
ptcr = ATMEL_PDC_RXTEN;
.pdc_enable = ATMEL_PDC_RXTEN,