serial: powerpc: Implement CONFIG_SERIAL_MULTI into sconsole serial driver

Implement support for CONFIG_SERIAL_MULTI into sconsole 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 sconsole 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: Anatolij Gustschin <agust@denx.de>
Cc: Stefan Roese <sr@denx.de>

board/pcippc2/sconsole.c

@@ -23,6 +23,8 @@
 
 #include <config.h>
 #include <common.h>
+#include <serial.h>
+#include <linux/compiler.h>
 
 #include "sconsole.h"
 
@@ -34,7 +36,7 @@ int	(*sconsole_getc) (void) = 0;
 int	(*sconsole_tstc) (void) = 0;
 void	(*sconsole_setbrg) (void) = 0;
 
-int serial_init (void)
+static int sconsole_serial_init(void)
 {
 	sconsole_buffer_t *sb = SCONSOLE_BUFFER;
 
@@ -46,7 +48,7 @@ int serial_init (void)
 	return (0);
 }
 
-void serial_putc (char c)
+static void sconsole_serial_putc(char c)
 {
 	if (sconsole_putc) {
 		(*sconsole_putc) (c);
@@ -65,7 +67,7 @@ void serial_putc (char c)
 	}
 }
 
-void serial_puts (const char *s)
+static void sconsole_serial_puts(const char *s)
 {
 	if (sconsole_puts) {
 		(*sconsole_puts) (s);
@@ -84,7 +86,7 @@ void serial_puts (const char *s)
 	}
 }
 
-int serial_getc (void)
+static int sconsole_serial_getc(void)
 {
 	if (sconsole_getc) {
 		return (*sconsole_getc) ();
@@ -93,7 +95,7 @@ int serial_getc (void)
 	}
 }
 
-int serial_tstc (void)
+static int sconsole_serial_tstc(void)
 {
 	if (sconsole_tstc) {
 		return (*sconsole_tstc) ();
@@ -102,7 +104,7 @@ int serial_tstc (void)
 	}
 }
 
-void serial_setbrg (void)
+static void sconsole_serial_setbrg(void)
 {
 	if (sconsole_setbrg) {
 		(*sconsole_setbrg) ();
@@ -113,6 +115,58 @@ void serial_setbrg (void)
 	}
 }
 
+#ifdef CONFIG_SERIAL_MULTI
+static struct serial_device sconsole_serial_drv = {
+	.name	= "sconsole_serial",
+	.start	= sconsole_serial_init,
+	.stop	= NULL,
+	.setbrg	= sconsole_serial_setbrg,
+	.putc	= sconsole_serial_putc,
+	.puts	= sconsole_serial_puts,
+	.getc	= sconsole_serial_getc,
+	.tstc	= sconsole_serial_tstc,
+};
+
+void sconsole_serial_initialize(void)
+{
+	serial_register(&sconsole_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &sconsole_serial_drv;
+}
+#else
+int serial_init(void)
+{
+	return sconsole_serial_init();
+}
+
+void serial_setbrg(void)
+{
+	sconsole_serial_setbrg();
+}
+
+void serial_putc(const char c)
+{
+	sconsole_serial_putc(c);
+}
+
+void serial_puts(const char *s)
+{
+	sconsole_serial_puts(s);
+}
+
+int serial_getc(void)
+{
+	return sconsole_serial_getc();
+}
+
+int serial_tstc(void)
+{
+	return sconsole_serial_tstc();
+}
+#endif
 int sconsole_get_baudrate (void)
 {
 	sconsole_buffer_t *sb = SCONSOLE_BUFFER;

common/serial.c

@@ -68,6 +68,7 @@ serial_initfunc(cogent_serial_initialize);
 serial_initfunc(cpci750_serial_initialize);
 serial_initfunc(evb64260_serial_initialize);
 serial_initfunc(ml2_serial_initialize);
+serial_initfunc(sconsole_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -114,6 +115,7 @@ void serial_initialize(void)
 	cpci750_serial_initialize();
 	evb64260_serial_initialize();
 	ml2_serial_initialize();
+	sconsole_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }