arch/blackfin/include/asm/trace.h

   1 /*
   2  * header file for hardware trace functions
   3  *
   4  * Copyright 2007-2008 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #ifndef _BLACKFIN_TRACE_
  10 #define _BLACKFIN_TRACE_
  11
  12 /* Normally, we use ON, but you can't turn on software expansion until
  13  * interrupts subsystem is ready
  14  */
  15
  16 #define BFIN_TRACE_INIT ((CONFIG_DEBUG_BFIN_HWTRACE_COMPRESSION << 4) | 0x03)
  17 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
  18 #define BFIN_TRACE_ON   (BFIN_TRACE_INIT | (CONFIG_DEBUG_BFIN_HWTRACE_EXPAND << 2))
  19 #else
  20 #define BFIN_TRACE_ON   (BFIN_TRACE_INIT)
  21 #endif
  22
  23 #ifndef __ASSEMBLY__
  24 extern unsigned long trace_buff_offset;
  25 extern unsigned long software_trace_buff[];
  26
  27 /* Trace Macros for C files */
  28
  29 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
  30
  31 #define trace_buffer_init() bfin_write_TBUFCTL(BFIN_TRACE_INIT)
  32
  33 #define trace_buffer_save(x) \
  34         do { \
  35                 (x) = bfin_read_TBUFCTL(); \
  36                 bfin_write_TBUFCTL((x) & ~TBUFEN); \
  37         } while (0)
  38
  39 #define trace_buffer_restore(x) \
  40         do { \
  41                 bfin_write_TBUFCTL((x));        \
  42         } while (0)
  43 #else /* DEBUG_BFIN_HWTRACE_ON */
  44
  45 #define trace_buffer_save(x)
  46 #define trace_buffer_restore(x)
  47 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
  48
  49 #else
  50 /* Trace Macros for Assembly files */
  51
  52 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
  53
  54 #define trace_buffer_stop(preg, dreg)   \
  55         preg.L = LO(TBUFCTL);           \
  56         preg.H = HI(TBUFCTL);           \
  57         dreg = 0x1;                     \
  58         [preg] = dreg;
  59
  60 #define trace_buffer_init(preg, dreg) \
  61         preg.L = LO(TBUFCTL);         \
  62         preg.H = HI(TBUFCTL);         \
  63         dreg = BFIN_TRACE_INIT;       \
  64         [preg] = dreg;
  65
  66 #define trace_buffer_save(preg, dreg) \
  67         preg.L = LO(TBUFCTL); \
  68         preg.H = HI(TBUFCTL); \
  69         dreg = [preg]; \
  70         [--sp] = dreg; \
  71         dreg = 0x1; \
  72         [preg] = dreg;
  73
  74 #define trace_buffer_restore(preg, dreg) \
  75         preg.L = LO(TBUFCTL); \
  76         preg.H = HI(TBUFCTL); \
  77         dreg = [sp++]; \
  78         [preg] = dreg;
  79
  80 #else /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
  81
  82 #define trace_buffer_stop(preg, dreg)
  83 #define trace_buffer_init(preg, dreg)
  84 #define trace_buffer_save(preg, dreg)
  85 #define trace_buffer_restore(preg, dreg)
  86
  87 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
  88
  89 #ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
  90 # define DEBUG_HWTRACE_SAVE(preg, dreg)    trace_buffer_save(preg, dreg)
  91 # define DEBUG_HWTRACE_RESTORE(preg, dreg) trace_buffer_restore(preg, dreg)
  92 #else
  93 # define DEBUG_HWTRACE_SAVE(preg, dreg)
  94 # define DEBUG_HWTRACE_RESTORE(preg, dreg)
  95 #endif
  96
  97 #endif /* __ASSEMBLY__ */
  98
  99 #endif                          /* _BLACKFIN_TRACE_ */