serial: sh: Implement CONFIG_SERIAL_MULTI into sh serial driver

Implement support for CONFIG_SERIAL_MULTI into sh 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 sh 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: Phil Edworthy <PHIL.EDWORTHY@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Tom Rini <trini@ti.com>

common/serial.c

@@ -92,6 +92,7 @@ serial_initfunc(netarm_serial_initialize);
 serial_initfunc(pl01x_serial_initialize);
 serial_initfunc(s3c44b0_serial_initialize);
 serial_initfunc(sa1100_serial_initialize);
+serial_initfunc(sh_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -162,6 +163,7 @@ void serial_initialize(void)
 	pl01x_serial_initialize();
 	s3c44b0_serial_initialize();
 	sa1100_serial_initialize();
+	sh_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }

drivers/serial/serial_sh.c

@@ -22,6 +22,8 @@
 #include <asm/io.h>
 #include <asm/processor.h>
 #include "serial_sh.h"
+#include <serial.h>
+#include <linux/compiler.h>
 
 #if defined(CONFIG_CONS_SCIF0)
 # define SCIF_BASE	SCIF0_BASE
@@ -55,13 +57,13 @@ static struct uart_port sh_sci = {
 	.type		= SCIF_BASE_PORT,
 };
 
-void serial_setbrg(void)
+static void sh_serial_setbrg(void)
 {
 	DECLARE_GLOBAL_DATA_PTR;
 	sci_out(&sh_sci, SCBRR, SCBRR_VALUE(gd->baudrate, CONFIG_SYS_CLK_FREQ));
 }
 
-int serial_init(void)
+static int sh_serial_init(void)
 {
 	sci_out(&sh_sci, SCSCR , SCSCR_INIT(&sh_sci));
 	sci_out(&sh_sci, SCSCR , SCSCR_INIT(&sh_sci));
@@ -127,21 +129,21 @@ void serial_raw_putc(const char c)
 	sci_out(&sh_sci, SCxSR, sci_in(&sh_sci, SCxSR) & ~SCxSR_TEND(&sh_sci));
 }
 
-void serial_putc(const char c)
+static void sh_serial_putc(const char c)
 {
 	if (c == '\n')
 		serial_raw_putc('\r');
 	serial_raw_putc(c);
 }
 
-void serial_puts(const char *s)
+static void sh_serial_puts(const char *s)
 {
 	char c;
 	while ((c = *s++) != 0)
 		serial_putc(c);
 }
 
-int serial_tstc(void)
+static int sh_serial_tstc(void)
 {
 	return serial_rx_fifo_level() ? 1 : 0;
 }
@@ -167,7 +169,7 @@ int serial_getc_check(void)
 	return status & (SCIF_DR | SCxSR_RDxF(&sh_sci));
 }
 
-int serial_getc(void)
+static int sh_serial_getc(void)
 {
 	unsigned short status;
 	char ch;
@@ -187,3 +189,56 @@ int serial_getc(void)
 		handle_error();
 	return ch;
 }
+
+#ifdef CONFIG_SERIAL_MULTI
+static struct serial_device sh_serial_drv = {
+	.name	= "sh_serial",
+	.start	= sh_serial_init,
+	.stop	= NULL,
+	.setbrg	= sh_serial_setbrg,
+	.putc	= sh_serial_putc,
+	.puts	= sh_serial_puts,
+	.getc	= sh_serial_getc,
+	.tstc	= sh_serial_tstc,
+};
+
+void sh_serial_initialize(void)
+{
+	serial_register(&sh_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &sh_serial_drv;
+}
+#else
+int serial_init(void)
+{
+	return sh_serial_init();
+}
+
+void serial_setbrg(void)
+{
+	sh_serial_setbrg();
+}
+
+void serial_putc(const char c)
+{
+	sh_serial_putc(c);
+}
+
+void serial_puts(const char *s)
+{
+	sh_serial_puts(s);
+}
+
+int serial_getc(void)
+{
+	return sh_serial_getc();
+}
+
+int serial_tstc(void)
+{
+	return sh_serial_tstc();
+}
+#endif