src/target/arm_jtag.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2005 by Dominic Rath                                    *
   5  *   Dominic.Rath@gmx.de                                                   *
   6  *                                                                         *
   7  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   8  *   oyvind.harboe@zylin.com                                               *
   9  ***************************************************************************/
  10
  11 #ifdef HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif
  14
  15 #include "arm_jtag.h"
  16
  17 #if 0
  18 #define _ARM_JTAG_SCAN_N_CHECK_
  19 #endif
  20
  21 int arm_jtag_set_instr_inner(struct jtag_tap *tap,
  22                 uint32_t new_instr, void *no_verify_capture, tap_state_t end_state)
  23 {
  24         struct scan_field field;
  25         uint8_t t[4] = { 0 };
  26
  27         field.num_bits = tap->ir_length;
  28         field.out_value = t;
  29         buf_set_u32(t, 0, field.num_bits, new_instr);
  30         field.in_value = NULL;
  31
  32         if (!no_verify_capture)
  33                 jtag_add_ir_scan(tap, &field, end_state);
  34         else {
  35                 /* FIX!!!! this is a kludge!!! arm926ejs.c should reimplement this arm_jtag_set_instr to
  36                  * have special verification code.
  37                  */
  38                 jtag_add_ir_scan_noverify(tap, &field, end_state);
  39         }
  40
  41         return ERROR_OK;
  42 }
  43
  44 int arm_jtag_scann_inner(struct arm_jtag *jtag_info, uint32_t new_scan_chain, tap_state_t end_state)
  45 {
  46         int retval = ERROR_OK;
  47
  48         uint8_t out_value[4] = { 0 };
  49         buf_set_u32(out_value, 0, jtag_info->scann_size, new_scan_chain);
  50         struct scan_field field = { .num_bits = jtag_info->scann_size, .out_value = out_value, };
  51
  52         retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->scann_instr, NULL, end_state);
  53         if (retval != ERROR_OK)
  54                 return retval;
  55
  56         jtag_add_dr_scan(jtag_info->tap,
  57                         1,
  58                         &field,
  59                         end_state);
  60
  61         jtag_info->cur_scan_chain = new_scan_chain;
  62
  63         return retval;
  64 }
  65
  66 static int arm_jtag_reset_callback(enum jtag_event event, void *priv)
  67 {
  68         struct arm_jtag *jtag_info = priv;
  69
  70         if (event == JTAG_TRST_ASSERTED)
  71                 jtag_info->cur_scan_chain = 0;
  72
  73         return ERROR_OK;
  74 }
  75
  76 int arm_jtag_setup_connection(struct arm_jtag *jtag_info)
  77 {
  78         jtag_info->scann_instr = 0x2;
  79         jtag_info->cur_scan_chain = 0;
  80         jtag_info->intest_instr = 0xc;
  81
  82         return jtag_register_event_callback(arm_jtag_reset_callback, jtag_info);
  83 }
  84
  85 int arm_jtag_close_connection(struct arm_jtag *jtag_info)
  86 {
  87         return jtag_unregister_event_callback(arm_jtag_reset_callback, jtag_info);
  88 }