Do full flush on uart8250 only at end of printk.

The previous code does a full flush of the uart after every character.
Unfortunately, this can cause transmission delays on some serial
ports.

This patch changes the code so that it does a flush at the end of
every printk instead of at the end of every character.  This reduces
the time it takes to transmit serial messages (up to 9% on my Asrock
e350m1 board).  It also makes the transmission time more consistent
which is important when performing timing tests via serial
transmissions.

Change-Id: I6b28488b905da68c6d68d7c517cc743cde567d70
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Reviewed-on: http://review.coreboot.org/90
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>
Reviewed-by: Sven Schnelle <svens@stackframe.org>

src/lib/uart8250.c

@@ -48,7 +48,10 @@ void uart8250_tx_byte(unsigned base_port, unsigned char data)
 {
 	uart8250_wait_to_tx_byte(base_port);
 	outb(data, base_port + UART_TBR);
-	/* Make certain the data clears the fifos */
+}
+
+void uart8250_tx_flush(unsigned base_port)
+{
 	uart8250_wait_until_sent(base_port);
 }
 

src/lib/uart8250mem.c

@@ -51,7 +51,10 @@ void uart8250_mem_tx_byte(unsigned base_port, unsigned char data)
 {
 	uart8250_mem_wait_to_tx_byte(base_port);
 	write8(base_port + UART_TBR, data);
-	/* Make certain the data clears the FIFOs */
+}
+
+void uart8250_mem_tx_flush(unsigned base_port)
+{
 	uart8250_mem_wait_until_sent(base_port);
 }