serial: oc: Implement CONFIG_SERIAL_MULTI into OpenCores serial driver

Implement support for CONFIG_SERIAL_MULTI into OpenCores 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 OpenCores 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: Scott McNutt <smcnutt@psyent.com>

common/serial.c

@@ -76,6 +76,7 @@ serial_initfunc(atmel_serial_initialize);
 serial_initfunc(lpc32xx_serial_initialize);
 serial_initfunc(mcf_serial_initialize);
 serial_initfunc(ns9750_serial_initialize);
+serial_initfunc(oc_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -130,6 +131,7 @@ void serial_initialize(void)
 	lpc32xx_serial_initialize();
 	mcf_serial_initialize();
 	ns9750_serial_initialize();
+	oc_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }

drivers/serial/opencores_yanu.c

@@ -37,7 +37,7 @@ static yanu_uart_t *uart = (yanu_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
 
 /* Everything's already setup for fixed-baud PTF assignment*/
 
-void serial_setbrg (void)
+static void oc_serial_setbrg(void)
 {
 	int n, k;
 	const unsigned max_uns = 0xFFFFFFFF;
@@ -68,7 +68,7 @@ void serial_setbrg (void)
 
 #else
 
-void serial_setbrg (void)
+static void oc_serial_setbrg(void)
 {
 	int n, k;
 	const unsigned max_uns = 0xFFFFFFFF;
@@ -100,7 +100,7 @@ void serial_setbrg (void)
 
 #endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
 
-int serial_init (void)
+static int oc_serial_init(void)
 {
 	unsigned action,control;
 
@@ -141,7 +141,7 @@ int serial_init (void)
 /*-----------------------------------------------------------------------
  * YANU CONSOLE
  *---------------------------------------------------------------------*/
-void serial_putc (char c)
+static void oc_serial_putc(char c)
 {
 	int tx_chars;
 	unsigned status;
@@ -161,7 +161,7 @@ void serial_putc (char c)
 	writel((unsigned char)c, &uart->data);
 }
 
-void serial_puts (const char *s)
+static void oc_serial_puts(const char *s)
 {
 	while (*s != 0) {
 		serial_putc (*s++);
@@ -169,7 +169,7 @@ void serial_puts (const char *s)
 }
 
 
-int serial_tstc(void)
+static int oc_serial_tstc(void)
 {
 	unsigned status ;
 
@@ -178,7 +178,7 @@ int serial_tstc(void)
 		 ((1 << YANU_RFIFO_CHARS_N) - 1)) > 0);
 }
 
-int serial_getc (void)
+statoc int oc_serial_getc(void)
 {
 	while (serial_tstc() == 0)
 		WATCHDOG_RESET ();
@@ -188,3 +188,56 @@ int serial_getc (void)
 
 	return(readl(&uart->data) & YANU_DATA_CHAR_MASK);
 }
+
+#ifdef CONFIG_SERIAL_MULTI
+static struct serial_device oc_serial_drv = {
+	.name	= "oc_serial",
+	.start	= oc_serial_init,
+	.stop	= NULL,
+	.setbrg	= oc_serial_setbrg,
+	.putc	= oc_serial_putc,
+	.puts	= oc_serial_puts,
+	.getc	= oc_serial_getc,
+	.tstc	= oc_serial_tstc,
+};
+
+void oc_serial_initialize(void)
+{
+	serial_register(&oc_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &oc_serial_drv;
+}
+#else
+int serial_init(void)
+{
+	return oc_serial_init();
+}
+
+void serial_setbrg(void)
+{
+	oc_serial_setbrg();
+}
+
+void serial_putc(const char c)
+{
+	oc_serial_putc(c);
+}
+
+void serial_puts(const char *s)
+{
+	oc_serial_puts(s);
+}
+
+int serial_getc(void)
+{
+	return oc_serial_getc();
+}
+
+int serial_tstc(void)
+{
+	return oc_serial_tstc();
+}
+#endif