src/target/arm_jtag.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  22  ***************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include "arm_jtag.h"
  29
  30 #if 0
  31 #define _ARM_JTAG_SCAN_N_CHECK_
  32 #endif
  33
  34 int arm_jtag_set_instr_inner(struct arm_jtag *jtag_info,
  35                 uint32_t new_instr, void *no_verify_capture, tap_state_t end_state)
  36 {
  37         struct jtag_tap *tap;
  38         tap = jtag_info->tap;
  39         struct scan_field field;
  40         uint8_t t[4];
  41
  42         field.num_bits = tap->ir_length;
  43         field.out_value = t;
  44         buf_set_u32(t, 0, field.num_bits, new_instr);
  45         field.in_value = NULL;
  46
  47         if (no_verify_capture == NULL)
  48                 jtag_add_ir_scan(tap, &field, end_state);
  49         else {
  50                 /* FIX!!!! this is a kludge!!! arm926ejs.c should reimplement this arm_jtag_set_instr to
  51                  * have special verification code.
  52                  */
  53                 jtag_add_ir_scan_noverify(tap, &field, end_state);
  54         }
  55
  56         return ERROR_OK;
  57 }
  58
  59 int arm_jtag_scann_inner(struct arm_jtag *jtag_info, uint32_t new_scan_chain, tap_state_t end_state)
  60 {
  61         int retval = ERROR_OK;
  62         uint32_t values[1];
  63         int num_bits[1];
  64
  65         values[0] = new_scan_chain;
  66         num_bits[0] = jtag_info->scann_size;
  67
  68         retval = arm_jtag_set_instr(jtag_info, jtag_info->scann_instr, NULL, end_state);
  69         if (retval != ERROR_OK)
  70                 return retval;
  71
  72         jtag_add_dr_out(jtag_info->tap,
  73                         1,
  74                         num_bits,
  75                         values,
  76                         end_state);
  77
  78         jtag_info->cur_scan_chain = new_scan_chain;
  79
  80         return retval;
  81 }
  82
  83 static int arm_jtag_reset_callback(enum jtag_event event, void *priv)
  84 {
  85         struct arm_jtag *jtag_info = priv;
  86
  87         if (event == JTAG_TRST_ASSERTED)
  88                 jtag_info->cur_scan_chain = 0;
  89
  90         return ERROR_OK;
  91 }
  92
  93 int arm_jtag_setup_connection(struct arm_jtag *jtag_info)
  94 {
  95         jtag_info->scann_instr = 0x2;
  96         jtag_info->cur_scan_chain = 0;
  97         jtag_info->intest_instr = 0xc;
  98
  99         return jtag_register_event_callback(arm_jtag_reset_callback, jtag_info);
 100 }