serial: arm: Implement CONFIG_SERIAL_MULTI into s3c44b0 serial driver

Implement support for CONFIG_SERIAL_MULTI into s3c44b0 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 s3c44b0 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>

common/serial.c

@@ -90,6 +90,7 @@ serial_initfunc(max3100_serial_initialize);
 serial_initfunc(mxc_serial_initialize);
 serial_initfunc(netarm_serial_initialize);
 serial_initfunc(pl01x_serial_initialize);
+serial_initfunc(s3c44b0_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -158,6 +159,7 @@ void serial_initialize(void)
 	mxc_serial_initialize();
 	netarm_serial_initialize();
 	pl01x_serial_initialize();
+	s3c44b0_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }

drivers/serial/serial_s3c44b0.c

@@ -68,7 +68,7 @@ static int serial_flush_output(void)
 }
 
 
-void serial_setbrg (void)
+static void s3c44b0_serial_setbrg(void)
 {
 	u32 divisor = 0;
 
@@ -156,7 +156,7 @@ void serial_setbrg (void)
  * are always 8 data bits, no parity, 1 stop bit, no start bits.
  *
  */
-int serial_init (void)
+static int s3c44b0_serial_init(void)
 {
 	serial_setbrg ();
 
@@ -167,7 +167,7 @@ int serial_init (void)
 /*
  * Output a single byte to the serial port.
  */
-void serial_putc (const char c)
+static void s3c44b0_serial_putc(const char c)
 {
 	/* wait for room in the transmit FIFO */
 	while(!(UTRSTAT0 & 0x02));
@@ -187,7 +187,7 @@ void serial_putc (const char c)
  * otherwise. When the function is succesfull, the character read is
  * written into its argument c.
  */
-int serial_tstc (void)
+static int s3c44b0_serial_tstc(void)
 {
 	return (UTRSTAT0 & 0x01);
 }
@@ -197,22 +197,74 @@ int serial_tstc (void)
  * otherwise. When the function is succesfull, the character read is
  * written into its argument c.
  */
-int serial_getc (void)
+static int s3c44b0_serial_getc(void)
 {
 	int rv;
 
 	for(;;) {
-		rv = serial_tstc();
+		rv = s3c44b0_serial_tstc();
 
 		if(rv > 0)
 			return URXH0;
 	}
 }
 
-void
-serial_puts (const char *s)
+static void s3c44b0_serial_puts(const char *s)
 {
 	while (*s) {
 		serial_putc (*s++);
 	}
 }
+
+#ifdef CONFIG_SERIAL_MULTI
+static struct serial_device s3c44b0_serial_drv = {
+	.name	= "s3c44b0_serial",
+	.start	= s3c44b0_serial_init,
+	.stop	= NULL,
+	.setbrg	= s3c44b0_serial_setbrg,
+	.putc	= s3c44b0_serial_putc,
+	.puts	= s3c44b0_serial_puts,
+	.getc	= s3c44b0_serial_getc,
+	.tstc	= s3c44b0_serial_tstc,
+};
+
+void s3c44b0_serial_initialize(void)
+{
+	serial_register(&s3c44b0_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &s3c44b0_serial_drv;
+}
+#else
+int serial_init(void)
+{
+	return s3c44b0_serial_init();
+}
+
+void serial_setbrg(void)
+{
+	s3c44b0_serial_setbrg();
+}
+
+void serial_putc(const char c)
+{
+	s3c44b0_serial_putc(c);
+}
+
+void serial_puts(const char *s)
+{
+	s3c44b0_serial_puts(s);
+}
+
+int serial_getc(void)
+{
+	return s3c44b0_serial_getc();
+}
+
+int serial_tstc(void)
+{
+	return s3c44b0_serial_tstc();
+}
+#endif