Commit 7d95ded9 authored by Tony Lindgren's avatar Tony Lindgren Committed by Russell King
Browse files

[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: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent baf97ce6

arch/arm/boot/compressed/head.S

+10 −0
Original line number Diff line number Diff line
@@ -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

+21 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/kernel/debug.S

+34 −1
Original line number Diff line number Diff line
@@ -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