serial: mcf: Implement CONFIG_SERIAL_MULTI into MCF serial driver

Implement support for CONFIG_SERIAL_MULTI into MCF serial driver.
This driver was so far only usable directly, but this patch also adds
support for the multi method. This allows using more than one serial
driver alongside the MCF driver. Also, add a weak implementation
of default_serial_console() returning this driver.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tom Rini <trini@ti.com>
Cc: TsiChung Liew <tsicliew@gmail.com>

common/serial.c

@@ -74,6 +74,7 @@ serial_initfunc(altera_jtag_serial_initialize);
 serial_initfunc(altera_serial_initialize);
 serial_initfunc(atmel_serial_initialize);
 serial_initfunc(lpc32xx_serial_initialize);
+serial_initfunc(mcf_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -126,6 +127,7 @@ void serial_initialize(void)
 	altera_serial_initialize();
 	atmel_serial_initialize();
 	lpc32xx_serial_initialize();
+	mcf_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }

drivers/serial/mcfuart.c

@@ -36,7 +36,7 @@ DECLARE_GLOBAL_DATA_PTR;
 
 extern void uart_port_conf(int port);
 
-int serial_init(void)
+static int mcf_serial_init(void)
 {
 	volatile uart_t *uart;
 	u32 counter;
@@ -74,7 +74,7 @@ int serial_init(void)
 	return (0);
 }
 
-void serial_putc(const char c)
+static void mcf_serial_putc(const char c)
 {
 	volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
 
@@ -87,14 +87,14 @@ void serial_putc(const char c)
 	uart->utb = c;
 }
 
-void serial_puts(const char *s)
+static void mcf_serial_puts(const char *s)
 {
 	while (*s) {
 		serial_putc(*s++);
 	}
 }
 
-int serial_getc(void)
+static int mcf_serial_getc(void)
 {
 	volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
 
@@ -103,14 +103,14 @@ int serial_getc(void)
 	return uart->urb;
 }
 
-int serial_tstc(void)
+static int mcf_serial_tstc(void)
 {
 	volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
 
 	return (uart->usr & UART_USR_RXRDY);
 }
 
-void serial_setbrg(void)
+static void mcf_serial_setbrg(void)
 {
 	volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
 	u32 counter;
@@ -129,3 +129,56 @@ void serial_setbrg(void)
 
 	uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED;
 }
+
+#ifdef CONFIG_SERIAL_MULTI
+static struct serial_device mcf_serial_drv = {
+	.name	= "mcf_serial",
+	.start	= mcf_serial_init,
+	.stop	= NULL,
+	.setbrg	= mcf_serial_setbrg,
+	.putc	= mcf_serial_putc,
+	.puts	= mcf_serial_puts,
+	.getc	= mcf_serial_getc,
+	.tstc	= mcf_serial_tstc,
+};
+
+void mcf_serial_initialize(void)
+{
+	serial_register(&mcf_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &mcf_serial_drv;
+}
+#else
+int serial_init(void)
+{
+	return mcf_serial_init();
+}
+
+void serial_setbrg(void)
+{
+	mcf_serial_setbrg();
+}
+
+void serial_putc(const char c)
+{
+	mcf_serial_putc(c);
+}
+
+void serial_puts(const char *s)
+{
+	mcf_serial_puts(s);
+}
+
+int serial_getc(void)
+{
+	return mcf_serial_getc();
+}
+
+int serial_tstc(void)
+{
+	return mcf_serial_tstc();
+}
+#endif