3 files changed, 58 insertions, 10 deletions

diff --git a/arch/powerpc/include/asm/udbg.h b/arch/powerpc/include/asm/udbg.h
index 6418ceea44b..cd21e5e6b04 100644
--- a/arch/powerpc/include/asm/udbg.h
+++ b/arch/powerpc/include/asm/udbg.h
@@ -15,6 +15,7 @@
 #include <linux/init.h>
 
 extern void (*udbg_putc)(char c);
+extern void (*udbg_flush)(void);
 extern int (*udbg_getc)(void);
 extern int (*udbg_getc_poll)(void);
 
diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
index 7d6c9bb8c77..fc9af47e212 100644
--- a/arch/powerpc/kernel/udbg.c
+++ b/arch/powerpc/kernel/udbg.c
@@ -18,6 +18,7 @@
 #include <asm/udbg.h>
 
 void (*udbg_putc)(char c);
+void (*udbg_flush)(void);
 int (*udbg_getc)(void);
 int (*udbg_getc_poll)(void);
 
@@ -76,6 +77,9 @@ void udbg_puts(const char *s)
 			while ((c = *s++) != '\0')
 				udbg_putc(c);
 		}
+
+		if (udbg_flush)
+			udbg_flush();
 	}
 #if 0
 	else {
@@ -98,6 +102,9 @@ int udbg_write(const char *s, int n)
 		}
 	}
 
+	if (udbg_flush)
+		udbg_flush();
+
 	return n - remain;
 }
 
diff --git a/arch/powerpc/kernel/udbg_16550.c b/arch/powerpc/kernel/udbg_16550.c
index 7b7da8cfd5e..0362a891e54 100644
--- a/arch/powerpc/kernel/udbg_16550.c
+++ b/arch/powerpc/kernel/udbg_16550.c
@@ -48,14 +48,21 @@ struct NS16550 {
 
 static struct NS16550 __iomem *udbg_comport;
 
-static void udbg_550_putc(char c)
+static void udbg_550_flush(void)
 {
 	if (udbg_comport) {
 		while ((in_8(&udbg_comport->lsr) & LSR_THRE) == 0)
 			/* wait for idle */;
-		out_8(&udbg_comport->thr, c);
+	}
+}
+
+static void udbg_550_putc(char c)
+{
+	if (udbg_comport) {
 		if (c == '\n')
 			udbg_550_putc('\r');
+		udbg_550_flush();
+		out_8(&udbg_comport->thr, c);
 	}
 }
 
@@ -108,6 +115,7 @@ void udbg_init_uart(void __iomem *comport, unsigned int speed,
 		/* Clear & enable FIFOs */
 		out_8(&udbg_comport->fcr ,0x07);
 		udbg_putc = udbg_550_putc;
+		udbg_flush = udbg_550_flush;
 		udbg_getc = udbg_550_getc;
 		udbg_getc_poll = udbg_550_getc_poll;
 	}
@@ -149,14 +157,21 @@ unsigned int udbg_probe_uart_speed(void __iomem *comport, unsigned int clock)
 }
 
 #ifdef CONFIG_PPC_MAPLE
-void udbg_maple_real_putc(char c)
+void udbg_maple_real_flush(void)
 {
 	if (udbg_comport) {
 		while ((real_readb(&udbg_comport->lsr) & LSR_THRE) == 0)
 			/* wait for idle */;
-		real_writeb(c, &udbg_comport->thr); eieio();
+	}
+}
+
+void udbg_maple_real_putc(char c)
+{
+	if (udbg_comport) {
 		if (c == '\n')
 			udbg_maple_real_putc('\r');
+		udbg_maple_real_flush();
+		real_writeb(c, &udbg_comport->thr); eieio();
 	}
 }
 
@@ -165,20 +180,28 @@ void __init udbg_init_maple_realmode(void)
 	udbg_comport = (struct NS16550 __iomem *)0xf40003f8;
 
 	udbg_putc = udbg_maple_real_putc;
+	udbg_flush = udbg_maple_real_flush;
 	udbg_getc = NULL;
 	udbg_getc_poll = NULL;
 }
 #endif /* CONFIG_PPC_MAPLE */
 
 #ifdef CONFIG_PPC_PASEMI
-void udbg_pas_real_putc(char c)
+void udbg_pas_real_flush(void)
 {
 	if (udbg_comport) {
 		while ((real_205_readb(&udbg_comport->lsr) & LSR_THRE) == 0)
 			/* wait for idle */;
-		real_205_writeb(c, &udbg_comport->thr); eieio();
+	}
+}
+
+void udbg_pas_real_putc(char c)
+{
+	if (udbg_comport) {
 		if (c == '\n')
 			udbg_pas_real_putc('\r');
+		udbg_pas_real_flush();
+		real_205_writeb(c, &udbg_comport->thr); eieio();
 	}
 }
 
@@ -187,6 +210,7 @@ void udbg_init_pas_realmode(void)
 	udbg_comport = (struct NS16550 __iomem *)0xfcff03f8UL;
 
 	udbg_putc = udbg_pas_real_putc;
+	udbg_flush = udbg_pas_real_flush;
 	udbg_getc = NULL;
 	udbg_getc_poll = NULL;
 }
@@ -195,14 +219,21 @@ void udbg_init_pas_realmode(void)
 #ifdef CONFIG_PPC_EARLY_DEBUG_44x
 #include <platforms/44x/44x.h>
 
-static void udbg_44x_as1_putc(char c)
+static int udbg_44x_as1_flush(void)
 {
 	if (udbg_comport) {
 		while ((as1_readb(&udbg_comport->lsr) & LSR_THRE) == 0)
 			/* wait for idle */;
-		as1_writeb(c, &udbg_comport->thr); eieio();
+	}
+}
+
+static void udbg_44x_as1_putc(char c)
+{
+	if (udbg_comport) {
 		if (c == '\n')
 			udbg_44x_as1_putc('\r');
+		udbg_44x_as1_flush();
+		as1_writeb(c, &udbg_comport->thr); eieio();
 	}
 }
 
@@ -222,19 +253,27 @@ void __init udbg_init_44x_as1(void)
 		(struct NS16550 __iomem *)PPC44x_EARLY_DEBUG_VIRTADDR;
 
 	udbg_putc = udbg_44x_as1_putc;
+	udbg_flush = udbg_44x_as1_flush;
 	udbg_getc = udbg_44x_as1_getc;
 }
 #endif /* CONFIG_PPC_EARLY_DEBUG_44x */
 
 #ifdef CONFIG_PPC_EARLY_DEBUG_40x
-static void udbg_40x_real_putc(char c)
+static void udbg_40x_real_flush(void)
 {
 	if (udbg_comport) {
 		while ((real_readb(&udbg_comport->lsr) & LSR_THRE) == 0)
 			/* wait for idle */;
-		real_writeb(c, &udbg_comport->thr); eieio();
+	}
+}
+
+static void udbg_40x_real_putc(char c)
+{
+	if (udbg_comport) {
 		if (c == '\n')
 			udbg_40x_real_putc('\r');
+		udbg_40x_real_flush();
+		real_writeb(c, &udbg_comport->thr); eieio();
 	}
 }
 
@@ -254,6 +293,7 @@ void __init udbg_init_40x_realmode(void)
 		CONFIG_PPC_EARLY_DEBUG_40x_PHYSADDR;
 
 	udbg_putc = udbg_40x_real_putc;
+	udbg_flush = udbg_40x_real_flush;
 	udbg_getc = udbg_40x_real_getc;
 	udbg_getc_poll = NULL;
 }