From 200b7a8dc09504bc0aedac567a307a6e533f39e5 Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@atomide.com>
Date: Tue, 19 Jan 2010 16:40:07 +0100
Subject: ARM: 5884/1: arm: Fix DCC console for v7

Without this patch arch/arm/compressed/head.S defaults to generic
DCC code that does not work for v7.

For more information on the v7 DCC, see Cortex-A8 TRM
"12.11.1 Debug communications channel".

To use it with post 2.6.33-rc1 or later, you need to have:

CONFIG_DEBUG_LL=y
ONFIG_DEBUG_ICEDCC=y
CONFIG_EARLY_PRINTK=y

Earlier kernels need commit 93fd03a8c6728b58879f8af20ffd55d9c32a778b
backported.

Tested on omap3430.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/debug.S | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'arch/arm/kernel/debug.S')

diff --git a/arch/arm/kernel/debug.S b/arch/arm/kernel/debug.S
index b121b6053cce..5c91addcaebc 100644
--- a/arch/arm/kernel/debug.S
+++ b/arch/arm/kernel/debug.S
@@ -49,6 +49,26 @@
 1002:
 		.endm
 
+#elif defined(CONFIG_CPU_V7)
+
+		.macro	addruart, rx
+		.endm
+
+		.macro	senduart, rd, rx
+		mcr	p14, 0, \rd, c0, c5, 0
+		.endm
+
+		.macro	busyuart, rd, rx
+busy:		mrc	p14, 0, pc, c0, c1, 0
+		bcs	busy
+		.endm
+
+		.macro	waituart, rd, rx
+wait:		mrc	p14, 0, pc, c0, c1, 0
+		bcs	wait
+
+		.endm
+
 #elif defined(CONFIG_CPU_XSCALE)
 
 		.macro	addruart, rx
-- 
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