serial: powerpc: Implement CONFIG_SERIAL_MULTI into ml2 serial driver

Implement support for CONFIG_SERIAL_MULTI into ml2 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 ml2 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/ml2/serial.c

@@ -24,6 +24,8 @@
 #include <asm/processor.h>
 #include <command.h>
 #include <configs/ML2.h>
+#include <serial.h>
+#include <linux/compiler.h>
 
 #if (defined CONFIG_SYS_INIT_CHAN1) || (defined CONFIG_SYS_INIT_CHAN2)
 #include <ns16550.h>
@@ -37,7 +39,7 @@ const NS16550_t COM_PORTS[] = { (NS16550_t) CONFIG_SYS_NS16550_COM1,
 };
 #endif
 
-int serial_init (void)
+static int ml2_serial_init(void)
 {
 	int clock_divisor = CONFIG_SYS_NS16550_CLK / 16 / gd->baudrate;
 
@@ -51,7 +53,7 @@ int serial_init (void)
 
 }
 
-void serial_putc (const char c)
+static void ml2_serial_putc(const char c)
 {
 	if (c == '\n')
 		NS16550_putc (COM_PORTS[CONFIG_SYS_DUART_CHAN], '\r');
@@ -59,17 +61,17 @@ void serial_putc (const char c)
 	NS16550_putc (COM_PORTS[CONFIG_SYS_DUART_CHAN], c);
 }
 
-int serial_getc (void)
+static int ml2_serial_getc(void)
 {
 	return NS16550_getc (COM_PORTS[CONFIG_SYS_DUART_CHAN]);
 }
 
-int serial_tstc (void)
+static int ml2_serial_tstc(void)
 {
 	return NS16550_tstc (COM_PORTS[CONFIG_SYS_DUART_CHAN]);
 }
 
-void serial_setbrg (void)
+static void ml2_serial_setbrg(void)
 {
 	int clock_divisor = CONFIG_SYS_NS16550_CLK / 16 / gd->baudrate;
 
@@ -81,13 +83,65 @@ void serial_setbrg (void)
 #endif
 }
 
-void serial_puts (const char *s)
+static void ml2_serial_puts(const char *s)
 {
 	while (*s) {
 		serial_putc (*s++);
 	}
 }
 
+#ifdef CONFIG_SERIAL_MULTI
+static struct serial_device ml2_serial_drv = {
+	.name	= "ml2_serial",
+	.start	= ml2_serial_init,
+	.stop	= NULL,
+	.setbrg	= ml2_serial_setbrg,
+	.putc	= ml2_serial_putc,
+	.puts	= ml2_serial_puts,
+	.getc	= ml2_serial_getc,
+	.tstc	= ml2_serial_tstc,
+};
+
+void ml2_serial_initialize(void)
+{
+	serial_register(&ml2_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &ml2_serial_drv;
+}
+#else
+int serial_init(void)
+{
+	return ml2_serial_init();
+}
+
+void serial_setbrg(void)
+{
+	ml2_serial_setbrg();
+}
+
+void serial_putc(const char c)
+{
+	ml2_serial_putc(c);
+}
+
+void serial_puts(const char *s)
+{
+	ml2_serial_puts(s);
+}
+
+int serial_getc(void)
+{
+	return ml2_serial_getc();
+}
+
+int serial_tstc(void)
+{
+	return ml2_serial_tstc();
+}
+#endif
 #if defined(CONFIG_CMD_KGDB)
 void kgdb_serial_init (void)
 {

common/serial.c

@@ -67,6 +67,7 @@ serial_initfunc(bmw_serial_initialize);
 serial_initfunc(cogent_serial_initialize);
 serial_initfunc(cpci750_serial_initialize);
 serial_initfunc(evb64260_serial_initialize);
+serial_initfunc(ml2_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -112,6 +113,7 @@ void serial_initialize(void)
 	cogent_serial_initialize();
 	cpci750_serial_initialize();
 	evb64260_serial_initialize();
+	ml2_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }