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 93fd03a8c6
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/boot/compressed/head.S

@@ -27,6 +27,14 @@
 		.macro	writeb, ch, rb
 		mcr	p14, 0, \ch, c0, c5, 0
 		.endm
+#elif defined(CONFIG_CPU_V7)
+		.macro	loadsp, rb
+		.endm
+		.macro	writeb, ch, rb
+wait:		mrc	p14, 0, pc, c0, c1, 0
+		bcs	wait
+		mcr	p14, 0, \ch, c0, c5, 0
+		.endm
 #elif defined(CONFIG_CPU_XSCALE)
 		.macro	loadsp, rb
 		.endm

arch/arm/boot/compressed/misc.c

@@ -53,6 +53,18 @@ static void icedcc_putc(int ch)
 
 	asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
 }
+
+#elif defined(CONFIG_CPU_V7)
+
+static void icedcc_putc(int ch)
+{
+	asm(
+	"wait:	mrc	p14, 0, pc, c0, c1, 0			\n\
+		bcs	wait					\n\
+		mcr     p14, 0, %0, c0, c5, 0			"
+	: : "r" (ch));
+}
+
 #elif defined(CONFIG_CPU_XSCALE)
 
 static void icedcc_putc(int ch)

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