serial: mips: Implement CONFIG_SERIAL_MULTI into asc serial driver

Implement support for CONFIG_SERIAL_MULTI into asc 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 asc 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: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>

arch/mips/cpu/mips32/incaip/asc_serial.c

@@ -5,6 +5,8 @@
 #include <config.h>
 #include <common.h>
 #include <asm/inca-ip.h>
+#include <serial.h>
+#include <linux/compiler.h>
 #include "asc_serial.h"
 
 
@@ -32,7 +34,7 @@ static volatile incaAsc_t *pAsc = (incaAsc_t *)INCA_IP_ASC;
 * RETURNS: N/A
 */
 
-int serial_init (void)
+static int asc_serial_init(void)
 {
     /* we have to set PMU.EN13 bit to enable an ASC device*/
     INCAASC_PMU_ENABLE(13);
@@ -82,7 +84,7 @@ int serial_init (void)
     return 0;
 }
 
-void serial_setbrg (void)
+static void asc_serial_setbrg(void)
 {
     ulong      uiReloadValue, fdv;
     ulong      f_ASC;
@@ -210,7 +212,7 @@ static int serial_setopt (void)
     return 0;
 }
 
-void serial_putc (const char c)
+static void asc_serial_putc(const char c)
 {
     uint txFl = 0;
 
@@ -234,7 +236,7 @@ void serial_putc (const char c)
     }
 }
 
-void serial_puts (const char *s)
+static void asc_serial_puts(const char *s)
 {
     while (*s)
     {
@@ -242,7 +244,7 @@ void serial_puts (const char *s)
     }
 }
 
-int serial_getc (void)
+static int asc_serial_getc(void)
 {
     ulong symbol_mask;
     char c;
@@ -257,7 +259,7 @@ int serial_getc (void)
     return c;
 }
 
-int serial_tstc (void)
+static int asc_serial_tstc(void)
 {
     int res = 1;
 
@@ -283,3 +285,56 @@ int serial_tstc (void)
 
     return res;
 }
+
+#ifdef CONFIG_SERIAL_MULTI
+static struct serial_device asc_serial_drv = {
+	.name	= "asc_serial",
+	.start	= asc_serial_init,
+	.stop	= NULL,
+	.setbrg	= asc_serial_setbrg,
+	.putc	= asc_serial_putc,
+	.puts	= asc_serial_puts,
+	.getc	= asc_serial_getc,
+	.tstc	= asc_serial_tstc,
+};
+
+void asc_serial_initialize(void)
+{
+	serial_register(&asc_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &asc_serial_drv;
+}
+#else
+int serial_init(void)
+{
+	return asc_serial_init();
+}
+
+void serial_setbrg(void)
+{
+	asc_serial_setbrg();
+}
+
+void serial_putc(const char c)
+{
+	asc_serial_putc(c);
+}
+
+void serial_puts(const char *s)
+{
+	asc_serial_puts(s);
+}
+
+int serial_getc(void)
+{
+	return asc_serial_getc();
+}
+
+int serial_tstc(void)
+{
+	return asc_serial_tstc();
+}
+#endif

common/serial.c

@@ -51,6 +51,7 @@ serial_initfunc(bfin_jtag_initialize);
 serial_initfunc(mpc512x_serial_initialize);
 serial_initfunc(uartlite_serial_initialize);
 serial_initfunc(au1x00_serial_initialize);
+serial_initfunc(asc_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -80,6 +81,7 @@ void serial_initialize(void)
 	uartlite_serial_initialize();
 	zynq_serial_initalize();
 	au1x00_serial_initialize();
+	asc_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }