added rx support

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

1 files changed, 13 insertions, 1 deletions

diff --git a/src/lib/uart8250.c b/src/lib/uart8250.c
index 67b0a95cfb..e3a1255dc6 100644
--- a/src/lib/uart8250.c
+++ b/src/lib/uart8250.c
@@ -20,7 +20,7 @@
 #define UART_MSR 0x06
 #define UART_SCR 0x07
 
-static inline int uart8250_can_tx_byte(unsigned base_port)
+static int uart8250_can_tx_byte(unsigned base_port)
 {
 	return inb(base_port + UART_LSR) & 0x20;
 }
@@ -45,6 +45,18 @@ void uart8250_tx_byte(unsigned base_port, unsigned char data)
 	uart8250_wait_until_sent(base_port);
 }
 
+int uart8250_can_rx_byte(unsigned base_port)
+{
+	return inb(base_port + UART_LSR) & 0x01;
+}
+
+unsigned char uart8250_rx_byte(unsigned base_port)
+{
+	while(!uart8250_can_rx_byte(base_port))
+		;
+	return inb(base_port + UART_RBR);
+}
+
 void uart8250_init(unsigned base_port, unsigned divisor, unsigned lcs)
 {
 	lcs &= 0x7f;