serial: arm: Implement CONFIG_SERIAL_MULTI into pl01x serial driver

Implement support for CONFIG_SERIAL_MULTI into pl01x 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 pl01x 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: Stefano Babic <sbabic@denx.de>
Cc: Mathieu J. Poirier <mathieu.poirier@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: John Rigby <john.rigby@linaro.org>
Cc: Rabin Vincent <rabin.vincent@stericsson.com>

common/serial.c

@@ -89,6 +89,7 @@ serial_initfunc(lpc2292_serial_initialize);
 serial_initfunc(max3100_serial_initialize);
 serial_initfunc(mxc_serial_initialize);
 serial_initfunc(netarm_serial_initialize);
+serial_initfunc(pl01x_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -156,6 +157,7 @@ void serial_initialize(void)
 	max3100_serial_initialize();
 	mxc_serial_initialize();
 	netarm_serial_initialize();
+	pl01x_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }

drivers/serial/serial_pl01x.c

@@ -30,6 +30,8 @@
 #include <common.h>
 #include <watchdog.h>
 #include <asm/io.h>
+#include <serial.h>
+#include <linux/compiler.h>
 #include "serial_pl01x.h"
 
 /*
@@ -54,7 +56,7 @@ static struct pl01x_regs *pl01x_get_regs(int portnum)
 
 #ifdef CONFIG_PL010_SERIAL
 
-int serial_init (void)
+static int pl01x_serial_init(void)
 {
 	struct pl01x_regs *regs = pl01x_get_regs(CONSOLE_PORT);
 	unsigned int divisor;
@@ -104,7 +106,7 @@ int serial_init (void)
 
 #ifdef CONFIG_PL011_SERIAL
 
-int serial_init (void)
+static int pl01x_serial_init(void)
 {
 	struct pl01x_regs *regs = pl01x_get_regs(CONSOLE_PORT);
 	unsigned int temp;
@@ -169,7 +171,7 @@ int serial_init (void)
 
 #endif /* CONFIG_PL011_SERIAL */
 
-void serial_putc (const char c)
+static void pl01x_serial_putc(const char c)
 {
 	if (c == '\n')
 		pl01x_putc (CONSOLE_PORT, '\r');
@@ -177,24 +179,24 @@ void serial_putc (const char c)
 	pl01x_putc (CONSOLE_PORT, c);
 }
 
-void serial_puts (const char *s)
+static void pl01x_serial_puts(const char *s)
 {
 	while (*s) {
 		serial_putc (*s++);
 	}
 }
 
-int serial_getc (void)
+static int pl01x_serial_getc(void)
 {
 	return pl01x_getc (CONSOLE_PORT);
 }
 
-int serial_tstc (void)
+static int pl01x_serial_tstc(void)
 {
 	return pl01x_tstc (CONSOLE_PORT);
 }
 
-void serial_setbrg (void)
+static void pl01x_serial_setbrg(void)
 {
 	struct pl01x_regs *regs = pl01x_get_regs(CONSOLE_PORT);
 
@@ -250,3 +252,56 @@ static int pl01x_tstc (int portnum)
 	WATCHDOG_RESET();
 	return !(readl(&regs->fr) & UART_PL01x_FR_RXFE);
 }
+
+#ifdef CONFIG_SERIAL_MULTI
+static struct serial_device pl01x_serial_drv = {
+	.name	= "pl01x_serial",
+	.start	= pl01x_serial_init,
+	.stop	= NULL,
+	.setbrg	= pl01x_serial_setbrg,
+	.putc	= pl01x_serial_putc,
+	.puts	= pl01x_serial_puts,
+	.getc	= pl01x_serial_getc,
+	.tstc	= pl01x_serial_tstc,
+};
+
+void pl01x_serial_initialize(void)
+{
+	serial_register(&pl01x_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &pl01x_serial_drv;
+}
+#else
+int serial_init(void)
+{
+	return pl01x_serial_init();
+}
+
+void serial_setbrg(void)
+{
+	pl01x_serial_setbrg();
+}
+
+void serial_putc(const char c)
+{
+	pl01x_serial_putc(c);
+}
+
+void serial_puts(const char *s)
+{
+	pl01x_serial_puts(s);
+}
+
+int serial_getc(void)
+{
+	return pl01x_serial_getc();
+}
+
+int serial_tstc(void)
+{
+	return pl01x_serial_tstc();
+}
+#endif