src/target/openrisc/or1k_tap_mohor.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2013 by Franck Jullien                                  *
   5  *   elec4fun@gmail.com                                                    *
   6  ***************************************************************************/
   7
   8 #ifdef HAVE_CONFIG_H
   9 #include "config.h"
  10 #endif
  11
  12 #include "or1k_tap.h"
  13 #include "or1k.h"
  14
  15 #include <jtag/jtag.h>
  16
  17 #define OR1K_TAP_INST_DEBUG     0x8
  18
  19 static int or1k_tap_mohor_init(struct or1k_jtag *jtag_info)
  20 {
  21         LOG_DEBUG("Initialising OpenCores JTAG TAP");
  22
  23         /* Put TAP into state where it can talk to the debug interface
  24          * by shifting in correct value to IR.
  25          */
  26
  27         /* Ensure TAP is reset - maybe not necessary*/
  28         jtag_add_tlr();
  29
  30         struct jtag_tap *tap = jtag_info->tap;
  31         struct scan_field field;
  32         uint8_t ir_value = OR1K_TAP_INST_DEBUG;
  33
  34         field.num_bits = tap->ir_length;
  35         field.out_value = &ir_value;
  36         field.in_value = NULL;
  37
  38         jtag_add_ir_scan(tap, &field, TAP_IDLE);
  39
  40         return jtag_execute_queue();
  41 }
  42
  43 static struct or1k_tap_ip mohor_tap = {
  44         .name = "mohor",
  45         .init = or1k_tap_mohor_init,
  46 };
  47
  48 int or1k_tap_mohor_register(void)
  49 {
  50         list_add_tail(&mohor_tap.list, &tap_list);
  51         return 0;
  52 }