ATMEL_US_BRGR
atmel_uart_writel(port, ATMEL_US_BRGR, quot);
quot = atmel_uart_readl(port, ATMEL_US_BRGR) & ATMEL_US_CD;
atmel_port->cache.brgr = atmel_uart_readl(port, ATMEL_US_BRGR);
atmel_uart_writel(port, ATMEL_US_BRGR, atmel_port->cache.brgr);
atmel_port->backup_brgr = atmel_uart_readl(port, ATMEL_US_BRGR);
atmel_uart_writel(port, ATMEL_US_BRGR, cd);
atmel_uart_writel(port, ATMEL_US_BRGR, atmel_port->backup_brgr);