added rx support

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

src/console/console.c

@@ -52,6 +52,31 @@ void console_tx_byte(unsigned char byte)
 	__console_tx_byte(byte);
 }
 
+unsigned char console_rx_byte(void)
+{
+	struct console_driver *driver;
+	if (!initialized)
+		return 0;
+	for(driver = console_drivers; driver < econsole_drivers; driver++)
+		if (driver->tst_byte)
+			break;
+	if (driver == econsole_drivers)
+		return 0;
+	while (!driver->tst_byte());
+	return driver->rx_byte();
+}
+
+int console_tst_byte(void)
+{
+	struct console_driver *driver;
+	if (!initialized)
+		return 0;
+	for(driver = console_drivers; driver < econsole_drivers; driver++)
+		if (driver->tst_byte)
+			return driver->tst_byte();
+	return 0;
+}
+
 /*
  *    Write POST information
  */

src/console/logbuf_console.c

@@ -16,4 +16,6 @@ static void logbuf_tx_byte(unsigned char byte)
 static struct console_driver __console = {
 	.init    = 0,
 	.tx_byte = logbuf_tx_byte,
+	.rx_byte = 0,
+	.tst_byte = 0,
 };}

src/console/uart8250_console.c

@@ -43,8 +43,20 @@ void ttyS0_tx_byte(unsigned char data)
 	uart8250_tx_byte(TTYS0_BASE, data);
 }
 
+unsigned char ttyS0_rx_byte(void) 
+{
+	return uart8250_rx_byte(TTYS0_BASE);
+}
+
+int ttyS0_tst_byte(unsigned char data) 
+{
+	return uart8250_can_rx_byte(TTYS0_BASE);
+}
+
 static struct console_driver uart8250_console __console = {
 	.init    = ttyS0_init,
 	.tx_byte = ttyS0_tx_byte,
+	.rx_byte = ttyS0_rx_byte,
+	.tst_byte = ttyS0_tst_byte,
 };
 

src/console/vga_console.c

@@ -97,4 +97,6 @@ static void vga_tx_byte(unsigned char byte)
 struct console_driver {
 	.init    = vga_init,
 	.tx_byte = vga_tx_byte,
+	.rx_byte = 0,
+	.tst_byte = 0,
 };

src/include/console/console.h

@@ -7,6 +7,8 @@
 void console_init(void);
 void console_tx_byte(unsigned char byte);
 void console_tx_flush(void);
+unsigned char console_rx_byte(void);
+int console_tst_byte(void);
 void post_code(uint8_t value);
 void die(char *msg);
 
@@ -14,6 +16,8 @@ struct console_driver {
 	void (*init)(void);
 	void (*tx_byte)(unsigned char byte);
 	void (*tx_flush)(void);
+	unsigned char (*rx_byte)(void);
+	int (*tst_byte)(void);
 };
 
 #define __console	__attribute__((unused, __section__ (".rodata.console_drivers")))

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);

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;