From 518039bc24cbb9ce34665814fe120eac50bedd9a Mon Sep 17 00:00:00 2001
From: Robin Getz
Date: Wed, 25 Jul 2007 11:03:28 +0800
Subject: Blackfin arch: Add ability to expend the hardware trace buffer

Add ability to expend the hardware trace buffer via a configurable
software buffer - so you can have lots of history when a crash occurs.

The interesting way we do printk in the traps.c confusese the checking
script

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

---
 include/asm-blackfin/trace.h | 55 ++++++++++++++++++++++++++++++++++++--------
 1 file changed, 46 insertions(+), 9 deletions(-)

(limited to 'include/asm-blackfin/trace.h')

diff --git a/include/asm-blackfin/trace.h b/include/asm-blackfin/trace.h
index 9c2474c9a589..6313aace9d59 100644
--- a/include/asm-blackfin/trace.h
+++ b/include/asm-blackfin/trace.h
@@ -6,23 +6,46 @@
 #ifndef _BLACKFIN_TRACE_
 #define _BLACKFIN_TRACE_
 
+/* Normally, we use ON, but you can't turn on software expansion until
+ * interrupts subsystem is ready
+ */
+
+#define BFIN_TRACE_INIT ((CONFIG_DEBUG_BFIN_HWTRACE_COMPRESSION << 4) | 0x03)
+#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
+#define BFIN_TRACE_ON   (BFIN_TRACE_INIT | (CONFIG_DEBUG_BFIN_HWTRACE_EXPAND << 2))
+#else
+#define BFIN_TRACE_ON   (BFIN_TRACE_INIT)
+#endif
+
 #ifndef __ASSEMBLY__
+extern unsigned long trace_buff_offset;
+extern unsigned long software_trace_buff[];
+
 /* Trace Macros for C files */
 
+#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
+
 #define trace_buffer_save(x) \
-        do { \
-                (x) = bfin_read_TBUFCTL(); \
-                bfin_write_TBUFCTL((x) & ~TBUFEN); \
-        } while (0)
+	do { \
+		(x) = bfin_read_TBUFCTL(); \
+		bfin_write_TBUFCTL((x) & ~TBUFEN); \
+	} while (0)
 
 #define trace_buffer_restore(x) \
-        do { \
-                bfin_write_TBUFCTL((x));        \
-        } while (0)
+	do { \
+		bfin_write_TBUFCTL((x));        \
+	} while (0)
+#else /* DEBUG_BFIN_HWTRACE_ON */
+
+#define trace_buffer_save(x)
+#define trace_buffer_restore(x)
+#endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
 
 #else
 /* Trace Macros for Assembly files */
 
+#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
+
 #define TRACE_BUFFER_START(preg, dreg) trace_buffer_start(preg, dreg)
 #define TRACE_BUFFER_STOP(preg, dreg)  trace_buffer_stop(preg, dreg)
 
@@ -32,12 +55,26 @@
 	dreg = 0x1;			\
 	[preg] = dreg;
 
-#define trace_buffer_start(preg, dreg) \
+#define trace_buffer_start(preg, dreg)	\
 	preg.L = LO(TBUFCTL);		\
 	preg.H = HI(TBUFCTL);		\
-	dreg = 0x13;			\
+	dreg = BFIN_TRACE_ON;		\
+	[preg] = dreg;
+
+#define trace_buffer_init(preg, dreg) \
+	preg.L = LO(TBUFCTL);         \
+	preg.H = HI(TBUFCTL);         \
+	dreg = BFIN_TRACE_INIT;       \
 	[preg] = dreg;
 
+#else /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
+
+#define trace_buffer_stop(preg, dreg)
+#define trace_buffer_start(preg, dreg)
+#define trace_buffer_init(preg, dreg)
+
+#endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
+
 #ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 # define DEBUG_START_HWTRACE(preg, dreg) trace_buffer_start(preg, dreg)
 # define DEBUG_STOP_HWTRACE(preg, dreg) trace_buffer_stop(preg, dreg)
-- 
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