added rx support

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1410 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/include/uart8250.h

@@ -6,6 +6,8 @@ struct uart8250 {
 	/* Do I need an lcs parameter here? */
 };
 
+unsigned char uart8250_rx_byte(unsigned base_port);
+int uart8250_can_rx_byte(unsigned base_port);
 void uart8250_tx_byte(unsigned base_port, unsigned char data);
 void uart8250_init(unsigned base_port, unsigned divisor, unsigned lcs);
 void init_uart8250(unsigned base_port, struct uart8250 *uart);