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authorRobin Getz <robin.getz@analog.com>2007-06-21 16:34:08 +0800
committerBryan Wu <bryan.wu@analog.com>2007-06-21 16:34:08 +0800
commit669b792c77bbc30e9f4d9c95dbc918dc348c49c2 (patch)
tree2d8403e9e3cf998eda8465a322261d45e24cd26a /include/asm-blackfin/trace.h
parentBlackfin arch: Start untangling the CPLB handling code. (diff)
downloadlinux-dev-669b792c77bbc30e9f4d9c95dbc918dc348c49c2.tar.xz
linux-dev-669b792c77bbc30e9f4d9c95dbc918dc348c49c2.zip
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>
Diffstat (limited to '')
-rw-r--r--include/asm-blackfin/trace.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/include/asm-blackfin/trace.h b/include/asm-blackfin/trace.h
new file mode 100644
index 000000000000..9c2474c9a589
--- /dev/null
+++ b/include/asm-blackfin/trace.h
@@ -0,0 +1,52 @@
+/*
+ * Common header file for blackfin family of processors.
+ *
+ */
+
+#ifndef _BLACKFIN_TRACE_
+#define _BLACKFIN_TRACE_
+
+#ifndef __ASSEMBLY__
+/* Trace Macros for C files */
+
+#define trace_buffer_save(x) \
+ do { \
+ (x) = bfin_read_TBUFCTL(); \
+ bfin_write_TBUFCTL((x) & ~TBUFEN); \
+ } while (0)
+
+#define trace_buffer_restore(x) \
+ do { \
+ bfin_write_TBUFCTL((x)); \
+ } while (0)
+
+#else
+/* Trace Macros for Assembly files */
+
+#define TRACE_BUFFER_START(preg, dreg) trace_buffer_start(preg, dreg)
+#define TRACE_BUFFER_STOP(preg, dreg) trace_buffer_stop(preg, dreg)
+
+#define trace_buffer_stop(preg, dreg) \
+ preg.L = LO(TBUFCTL); \
+ preg.H = HI(TBUFCTL); \
+ dreg = 0x1; \
+ [preg] = dreg;
+
+#define trace_buffer_start(preg, dreg) \
+ preg.L = LO(TBUFCTL); \
+ preg.H = HI(TBUFCTL); \
+ dreg = 0x13; \
+ [preg] = dreg;
+
+#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)
+
+#else
+# define DEBUG_START_HWTRACE(preg, dreg)
+# define DEBUG_STOP_HWTRACE(preg, dreg)
+#endif
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _BLACKFIN_TRACE_ */