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, see <http://www.gnu.org/licenses/>. *
  20  ***************************************************************************/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include "arm_jtag.h"
  27
  28 #if 0
  29 #define _ARM_JTAG_SCAN_N_CHECK_
  30 #endif
  31
  32 int arm_jtag_set_instr_inner(struct jtag_tap *tap,
  33                 uint32_t new_instr, void *no_verify_capture, tap_state_t end_state)
  34 {
  35         struct scan_field field;
  36         uint8_t t[4];
  37
  38         field.num_bits = tap->ir_length;
  39         field.out_value = t;
  40         buf_set_u32(t, 0, field.num_bits, new_instr);
  41         field.in_value = NULL;
  42
  43         if (no_verify_capture == NULL)
  44                 jtag_add_ir_scan(tap, &field, end_state);
  45         else {
  46                 /* FIX!!!! this is a kludge!!! arm926ejs.c should reimplement this arm_jtag_set_instr to
  47                  * have special verification code.
  48                  */
  49                 jtag_add_ir_scan_noverify(tap, &field, end_state);
  50         }
  51
  52         return ERROR_OK;
  53 }
  54
  55 int arm_jtag_scann_inner(struct arm_jtag *jtag_info, uint32_t new_scan_chain, tap_state_t end_state)
  56 {
  57         int retval = ERROR_OK;
  58
  59         uint8_t out_value[4];
  60         buf_set_u32(out_value, 0, jtag_info->scann_size, new_scan_chain);
  61         struct scan_field field = { .num_bits = jtag_info->scann_size, .out_value = out_value, };
  62
  63         retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->scann_instr, NULL, end_state);
  64         if (retval != ERROR_OK)
  65                 return retval;
  66
  67         jtag_add_dr_scan(jtag_info->tap,
  68                         1,
  69                         &field,
  70                         end_state);
  71
  72         jtag_info->cur_scan_chain = new_scan_chain;
  73
  74         return retval;
  75 }
  76
  77 static int arm_jtag_reset_callback(enum jtag_event event, void *priv)
  78 {
  79         struct arm_jtag *jtag_info = priv;
  80
  81         if (event == JTAG_TRST_ASSERTED)
  82                 jtag_info->cur_scan_chain = 0;
  83
  84         return ERROR_OK;
  85 }
  86
  87 int arm_jtag_setup_connection(struct arm_jtag *jtag_info)
  88 {
  89         jtag_info->scann_instr = 0x2;
  90         jtag_info->cur_scan_chain = 0;
  91         jtag_info->intest_instr = 0xc;
  92
  93         return jtag_register_event_callback(arm_jtag_reset_callback, jtag_info);
  94 }