From 7d95ded91149564100a3181d341361aedcfd5bf5 Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@atomide.com>
Date: Wed, 20 Sep 2006 13:03:34 +0100
Subject: [ARM] 3838/1: ARM: DCC debug console support for ARM11

Adds support for CONFIG_DEBUG_ICEDCC for ARM11.
Tested on ARM1136 (OMAP2420).

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/boot/compressed/head.S | 10 ++++++++++
 arch/arm/boot/compressed/misc.c | 21 +++++++++++++++++++++
 2 files changed, 31 insertions(+)

(limited to 'arch/arm/boot')

diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 987c4416049..75df1f764a1 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -20,11 +20,21 @@
 #ifdef DEBUG
 
 #if defined(CONFIG_DEBUG_ICEDCC)
+
+#ifdef CONFIG_CPU_V6
+		.macro	loadsp, rb
+		.endm
+		.macro	writeb, ch, rb
+		mcr	p14, 0, \ch, c0, c5, 0
+		.endm
+#else
 		.macro	loadsp, rb
 		.endm
 		.macro	writeb, ch, rb
 		mcr	p14, 0, \ch, c0, c1, 0
 		.endm
+#endif
+
 #else
 
 #include <asm/arch/debug-macro.S>
diff --git a/arch/arm/boot/compressed/misc.c b/arch/arm/boot/compressed/misc.c
index ace3fb5835d..283891c736c 100644
--- a/arch/arm/boot/compressed/misc.c
+++ b/arch/arm/boot/compressed/misc.c
@@ -30,6 +30,25 @@ static void putstr(const char *ptr);
 #include <asm/arch/uncompress.h>
 
 #ifdef CONFIG_DEBUG_ICEDCC
+
+#ifdef CONFIG_CPU_V6
+
+static void icedcc_putc(int ch)
+{
+	int status, i = 0x4000000;
+
+	do {
+		if (--i < 0)
+			return;
+
+		asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
+	} while (status & (1 << 29));
+
+	asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
+}
+
+#else
+
 static void icedcc_putc(int ch)
 {
 	int status, i = 0x4000000;
@@ -44,6 +63,8 @@ static void icedcc_putc(int ch)
 	asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
 }
 
+#endif
+
 #define putc(ch)	icedcc_putc(ch)
 #define flush()	do { } while (0)
 #endif
-- 
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