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>

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>

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 & 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

arch/arm/kernel/debug.S

@@ -21,6 +21,36 @@
 
 #if defined(CONFIG_DEBUG_ICEDCC)
 		@@ debug using ARM EmbeddedICE DCC channel
+
+#if defined(CONFIG_CPU_V6)
+
+		.macro	addruart, rx
+		.endm
+
+		.macro	senduart, rd, rx
+		mcr	p14, 0, \rd, c0, c5, 0
+		.endm
+
+		.macro	busyuart, rd, rx
+1001:
+		mrc	p14, 0, \rx, c0, c1, 0
+		tst	\rx, #0x20000000
+		beq	1001b
+		.endm
+
+		.macro	waituart, rd, rx
+		mov	\rd, #0x2000000
+1001:
+		subs	\rd, \rd, #1
+		bmi	1002f
+		mrc	p14, 0, \rx, c0, c1, 0
+		tst	\rx, #0x20000000
+		bne	1001b
+1002:
+		.endm
+
+#else
+
 		.macro	addruart, rx
 		.endm
 
@@ -46,9 +76,12 @@
 		bne	1001b
 1002:
 		.endm
+
+#endif	/* CONFIG_CPU_V6 */
+
 #else
 #include <asm/arch/debug-macro.S>
-#endif
+#endif	/* CONFIG_DEBUG_ICEDCC */
 
 /*
  * Useful debugging routines