src/target/openrisc/or1k_tap_mohor.c

   1 /***************************************************************************
   2  *   Copyright (C) 2013 by Franck Jullien                                  *
   3  *   elec4fun@gmail.com                                                    *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include "or1k_tap.h"
  26 #include "or1k.h"
  27
  28 #include <jtag/jtag.h>
  29
  30 #define OR1K_TAP_INST_DEBUG     0x8
  31
  32 static int or1k_tap_mohor_init(struct or1k_jtag *jtag_info)
  33 {
  34         LOG_DEBUG("Initialising OpenCores JTAG TAP");
  35
  36         /* Put TAP into state where it can talk to the debug interface
  37          * by shifting in correct value to IR.
  38          */
  39
  40         /* Ensure TAP is reset - maybe not necessary*/
  41         jtag_add_tlr();
  42
  43         struct jtag_tap *tap = jtag_info->tap;
  44         struct scan_field field;
  45         uint8_t ir_value = OR1K_TAP_INST_DEBUG;
  46
  47         field.num_bits = tap->ir_length;
  48         field.out_value = &ir_value;
  49         field.in_value = NULL;
  50
  51         jtag_add_ir_scan(tap, &field, TAP_IDLE);
  52
  53         return jtag_execute_queue();
  54 }
  55
  56 static struct or1k_tap_ip mohor_tap = {
  57         .name = "mohor",
  58         .init = or1k_tap_mohor_init,
  59 };
  60
  61 int or1k_tap_mohor_register(void)
  62 {
  63         list_add_tail(&mohor_tap.list, &tap_list);
  64         return 0;
  65 }