added rx support

[coreboot.git] / src / lib / uart8250.c

diff --git a/src/lib/uart8250.c b/src/lib/uart8250.c
index 67b0a95cfb30f81a669a3733b3cce8fee5637f18..e3a1255dc6f6f2277db4f76fc119e9db87280369 100644 (file)
--- 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;