serial: sparc: Implement CONFIG_SERIAL_MULTI into leon2 serial driver

Implement support for CONFIG_SERIAL_MULTI into leon2 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 leon2 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: Peter Tyser <ptyser@xes-inc.com>

arch/sparc/cpu/leon2/serial.c

@@ -26,6 +26,8 @@
 #include <common.h>
 #include <asm/processor.h>
 #include <asm/leon.h>
+#include <serial.h>
+#include <linux/compiler.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -39,7 +41,7 @@ DECLARE_GLOBAL_DATA_PTR;
 #define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)&(var))
 #endif
 
-int serial_init(void)
+static int leon2_serial_init(void)
 {
 	LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
 	LEON2_Uart_regs *regs;
@@ -72,15 +74,7 @@ int serial_init(void)
 	return 0;
 }
 
-void serial_putc(const char c)
-{
-	if (c == '\n')
-		serial_putc_raw('\r');
-
-	serial_putc_raw(c);
-}
-
-void serial_putc_raw(const char c)
+static void leon2_serial_putc_raw(const char c)
 {
 	LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
 	LEON2_Uart_regs *regs;
@@ -103,14 +97,22 @@ void serial_putc_raw(const char c)
 #endif
 }
 
-void serial_puts(const char *s)
+static void leon2_serial_putc(const char c)
+{
+	if (c == '\n')
+		leon2_serial_putc_raw('\r');
+
+	leon2_serial_putc_raw(c);
+}
+
+static void leon2_serial_puts(const char *s)
 {
 	while (*s) {
 		serial_putc(*s++);
 	}
 }
 
-int serial_getc(void)
+static int leon2_serial_getc(void)
 {
 	LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
 	LEON2_Uart_regs *regs;
@@ -128,7 +130,7 @@ int serial_getc(void)
 	return READ_WORD(regs->UART_Channel);
 }
 
-int serial_tstc(void)
+static int leon2_serial_tstc(void)
 {
 	LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
 	LEON2_Uart_regs *regs;
@@ -143,7 +145,7 @@ int serial_tstc(void)
 }
 
 /* set baud rate for uart */
-void serial_setbrg(void)
+static void leon2_serial_setbrg(void)
 {
 	/* update baud rate settings, read it from gd->baudrate */
 	unsigned int scaler;
@@ -163,3 +165,56 @@ void serial_setbrg(void)
 		regs->UART_Scaler = scaler;
 	}
 }
+
+#ifdef CONFIG_SERIAL_MULTI
+static struct serial_device leon2_serial_drv = {
+	.name	= "leon2_serial",
+	.start	= leon2_serial_init,
+	.stop	= NULL,
+	.setbrg	= leon2_serial_setbrg,
+	.putc	= leon2_serial_putc,
+	.puts	= leon2_serial_puts,
+	.getc	= leon2_serial_getc,
+	.tstc	= leon2_serial_tstc,
+};
+
+void leon2_serial_initialize(void)
+{
+	serial_register(&leon2_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &leon2_serial_drv;
+}
+#else
+int serial_init(void)
+{
+	return leon2_serial_init();
+}
+
+void serial_setbrg(void)
+{
+	leon2_serial_setbrg();
+}
+
+void serial_putc(const char c)
+{
+	leon2_serial_putc(c);
+}
+
+void serial_puts(const char *s)
+{
+	leon2_serial_puts(s);
+}
+
+int serial_getc(void)
+{
+	return leon2_serial_getc();
+}
+
+int serial_tstc(void)
+{
+	return leon2_serial_tstc();
+}
+#endif

common/serial.c

@@ -59,6 +59,7 @@ serial_initfunc(mpc8260_scc_serial_initialize);
 serial_initfunc(mpc8260_smc_serial_initialize);
 serial_initfunc(mpc85xx_serial_initialize);
 serial_initfunc(iop480_serial_initialize);
+serial_initfunc(leon2_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -96,6 +97,7 @@ void serial_initialize(void)
 	mpc8260_smc_serial_initialize();
 	mpc85xx_serial_initialize();
 	iop480_serial_initialize();
+	leon2_serial_initialize();
 
 	serial_assign(default_serial_console()->name);
 }