From 669b792c77bbc30e9f4d9c95dbc918dc348c49c2 Mon Sep 17 00:00:00 2001
From: Robin Getz <robin.getz@analog.com>
Date: Thu, 21 Jun 2007 16:34:08 +0800
Subject: Blackfin arch: Clean up trace buffer handling, No major functional
 changes.

Turns on trace earlier, so crashes at kernel start should print out a
trace, making things easier to debug.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
---
 arch/blackfin/mach-common/entry.S     | 33 +++++++--------------------------
 arch/blackfin/mach-common/interrupt.S |  8 ++++----
 2 files changed, 11 insertions(+), 30 deletions(-)

(limited to 'arch/blackfin/mach-common')

diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index c4a32ea06c4b..15603275f749 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -54,29 +54,10 @@
 #include <asm/errno.h>
 #include <asm/thread_info.h>  /* TIF_NEED_RESCHED */
 #include <asm/asm-offsets.h>
+#include <asm/trace.h>
 
 #include <asm/mach-common/context.S>
 
-#ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
-	/*
-	 * TODO: this should be proper save/restore, but for now
-	 * we'll just cheat and use 0x1/0x13
-	 */
-# define DEBUG_START_HWTRACE \
-	P5.l = LO(TBUFCTL); \
-	P5.h = HI(TBUFCTL); \
-	R7 = 0x13; \
-	[P5] = R7;
-# define DEBUG_STOP_HWTRACE \
-	P5.l = LO(TBUFCTL); \
-	P5.h = HI(TBUFCTL); \
-	R7 = 0x01; \
-	[P5] = R7;
-#else
-# define DEBUG_START_HWTRACE
-# define DEBUG_STOP_HWTRACE
-#endif
-
 #ifdef CONFIG_EXCPT_IRQ_SYSC_L1
 .section .l1.text
 #else
@@ -110,7 +91,7 @@ ENTRY(_ex_icplb)
 	ASTAT = [sp++];
 	SAVE_ALL_SYS
 	call __cplb_hdr;
-	DEBUG_START_HWTRACE
+	DEBUG_START_HWTRACE(p5, r7)
 	RESTORE_ALL_SYS
 	SP = RETN;
 	rtx;
@@ -128,7 +109,7 @@ ENTRY(_ex_spinlock)
 ENDPROC(_ex_spinlock)
 
 ENTRY(_ex_syscall)
-	DEBUG_START_HWTRACE
+	DEBUG_START_HWTRACE(p5, r7)
 	(R7:6,P5:4) = [sp++];
 	ASTAT = [sp++];
 	raise 15;		/* invoked by TRAP #0, for sys call */
@@ -186,7 +167,7 @@ ENTRY(_ex_single_step)
 	if !cc jump _ex_trap_c;
 
 _return_from_exception:
-	DEBUG_START_HWTRACE
+	DEBUG_START_HWTRACE(p5, r7)
 #ifdef ANOMALY_05000257
 	R7=LC0;
 	LC0=R7;
@@ -208,7 +189,7 @@ ENTRY(_handle_bad_cplb)
 	 * need to make a CPLB exception look like a normal exception
 	 */
 
-	DEBUG_START_HWTRACE
+	DEBUG_START_HWTRACE(p5, r7)
 	RESTORE_ALL_SYS
 	[--sp] = ASTAT;
 	[--sp] = (R7:6, P5:4);
@@ -251,7 +232,7 @@ ENTRY(_ex_trap_c)
 	R6 = SEQSTAT;
 	[P5] = R6;
 
-	DEBUG_START_HWTRACE
+	DEBUG_START_HWTRACE(p5, r7)
 	(R7:6,P5:4) = [sp++];
 	ASTAT = [sp++];
 	SP = RETN;
@@ -335,7 +316,7 @@ ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
 	/* Try to deal with syscalls quickly.  */
 	[--sp] = ASTAT;
 	[--sp] = (R7:6, P5:4);
-	DEBUG_STOP_HWTRACE
+	DEBUG_STOP_HWTRACE(p5, r7)
 	r7 = SEQSTAT;		/* reason code is in bit 5:0 */
 	r6.l = lo(SEQSTAT_EXCAUSE);
 	r6.h = hi(SEQSTAT_EXCAUSE);
diff --git a/arch/blackfin/mach-common/interrupt.S b/arch/blackfin/mach-common/interrupt.S
index 8be548e061bf..203e20709163 100644
--- a/arch/blackfin/mach-common/interrupt.S
+++ b/arch/blackfin/mach-common/interrupt.S
@@ -34,6 +34,7 @@
 #include <linux/linkage.h>
 #include <asm/entry.h>
 #include <asm/asm-offsets.h>
+#include <asm/trace.h>
 
 #include <asm/mach-common/context.S>
 
@@ -170,10 +171,9 @@ ENTRY(_evt_ivhw)
 	r7.l = W[p5];
 1:
 #endif
-	p0.l = lo(TBUFCTL);
-	p0.h = hi(TBUFCTL);
-	r0 = 1;
-	[p0] = r0;
+
+	trace_buffer_stop(p0, r0);
+
 	r0 = IRQ_HWERR;
 	r1 = sp;
 
-- 
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