riscv/jtag_dtm.h

   1 #ifndef JTAG_DTM_H
   2 #define JTAG_DTM_H
   3
   4 #include <stdint.h>
   5
   6 class debug_module_t;
   7
   8 typedef enum {
   9   TEST_LOGIC_RESET,
  10   RUN_TEST_IDLE,
  11   SELECT_DR_SCAN,
  12   CAPTURE_DR,
  13   SHIFT_DR,
  14   EXIT1_DR,
  15   PAUSE_DR,
  16   EXIT2_DR,
  17   UPDATE_DR,
  18   SELECT_IR_SCAN,
  19   CAPTURE_IR,
  20   SHIFT_IR,
  21   EXIT1_IR,
  22   PAUSE_IR,
  23   EXIT2_IR,
  24   UPDATE_IR
  25 } jtag_state_t;
  26
  27 class jtag_dtm_t
  28 {
  29   static const unsigned idcode = 0xdeadbeef;
  30
  31   public:
  32     jtag_dtm_t(debug_module_t *dm);
  33     void reset();
  34
  35     void set_pins(bool tck, bool tms, bool tdi);
  36
  37     bool tdo() const { return _tdo; }
  38
  39     jtag_state_t state() const { return _state; }
  40
  41   private:
  42     debug_module_t *dm;
  43     bool _tck, _tms, _tdi, _tdo;
  44     uint32_t ir;
  45     const unsigned ir_length = 5;
  46     uint64_t dr;
  47     unsigned dr_length;
  48
  49     // abits must come before dtmcontrol so it can easily be used in the
  50     // constructor.
  51     const unsigned abits = 6;
  52     uint32_t dtmcontrol;
  53     uint64_t dmi;
  54
  55     jtag_state_t _state;
  56
  57     void capture_dr();
  58     void update_dr();
  59 };
  60
  61 #endif