git.sur5r.net Git - openocd/blob - src/jtag/core.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  *   Copyright (C) 2009 SoftPLC Corporation                                *
   9  *       http://softplc.com                                                *
  10  *   dick@softplc.com                                                      *
  11  *                                                                         *
  12  *   Copyright (C) 2009 Zachary T Welch                                    *
  13  *   zw@superlucidity.net                                                  *
  14  *                                                                         *
  15  *   This program is free software; you can redistribute it and/or modify  *
  16  *   it under the terms of the GNU General Public License as published by  *
  17  *   the Free Software Foundation; either version 2 of the License, or     *
  18  *   (at your option) any later version.                                   *
  19  *                                                                         *
  20  *   This program is distributed in the hope that it will be useful,       *
  21  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  22  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  23  *   GNU General Public License for more details.                          *
  24  *                                                                         *
  25  *   You should have received a copy of the GNU General Public License     *
  26  *   along with this program; if not, write to the                         *
  27  *   Free Software Foundation, Inc.,                                       *
  28  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  29  ***************************************************************************/
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #include "jtag.h"
  35 #include "minidriver.h"
  36 #include "interface.h"
  37
  38 #ifdef HAVE_STRINGS_H
  39 #include <strings.h>
  40 #endif
  41
  42
  43 /// The number of JTAG queue flushes (for profiling and debugging purposes).
  44 static int jtag_flush_queue_count;
  45
  46 static void jtag_add_scan_check(void (*jtag_add_scan)(int in_num_fields, const scan_field_t *in_fields, tap_state_t state),
  47                 int in_num_fields, scan_field_t *in_fields, tap_state_t state);
  48
  49 /**
  50  * The jtag_error variable is set when an error occurs while executing
  51  * the queue.  Application code may set this using jtag_set_error(),
  52  * when an error occurs during processing that should be reported during
  53  * jtag_execute_queue().
  54  *
  55  * Tts value may be checked with jtag_get_error() and cleared with
  56  * jtag_error_clear().  This value is returned (and cleared) by
  57  * jtag_execute_queue().
  58  */
  59 static int jtag_error = ERROR_OK;
  60
  61 static const char *jtag_event_strings[] =
  62 {
  63         [JTAG_TRST_ASSERTED] = "JTAG controller reset (RESET or TRST)",
  64         [JTAG_TAP_EVENT_ENABLE] = "TAP enabled",
  65         [JTAG_TAP_EVENT_DISABLE] = "TAP disabled",
  66 };
  67
  68 static int jtag_trst = 0;
  69 static int jtag_srst = 0;
  70
  71 /**
  72  * List all TAPs that have been created.
  73  */
  74 static jtag_tap_t *__jtag_all_taps = NULL;
  75 /**
  76  * The number of TAPs in the __jtag_all_taps list, used to track the
  77  * assigned chain position to new TAPs
  78  */
  79 static unsigned jtag_num_taps = 0;
  80
  81 static enum reset_types jtag_reset_config = RESET_NONE;
  82 static tap_state_t cmd_queue_end_state = TAP_RESET;
  83 tap_state_t cmd_queue_cur_state = TAP_RESET;
  84
  85 static bool jtag_verify_capture_ir = true;
  86 static int jtag_verify = 1;
  87
  88 /* how long the OpenOCD should wait before attempting JTAG communication after reset lines deasserted (in ms) */
  89 static int jtag_nsrst_delay = 0; /* default to no nSRST delay */
  90 static int jtag_ntrst_delay = 0; /* default to no nTRST delay */
  91
  92 typedef struct jtag_event_callback_s
  93 {
  94         jtag_event_handler_t          callback;
  95         void*                         priv;
  96         struct jtag_event_callback_s* next;
  97 } jtag_event_callback_t;
  98
  99 /* callbacks to inform high-level handlers about JTAG state changes */
 100 static jtag_event_callback_t *jtag_event_callbacks;
 101
 102 /* speed in kHz*/
 103 static int speed_khz = 0;
 104 /* flag if the kHz speed was defined */
 105 static bool hasKHz = false;
 106 static int jtag_speed = 0;
 107
 108 static struct jtag_interface_s *jtag = NULL;
 109
 110 /* configuration */
 111 jtag_interface_t *jtag_interface = NULL;
 112
 113 void jtag_set_error(int error)
 114 {
 115         if ((error == ERROR_OK) || (jtag_error != ERROR_OK))
 116                 return;
 117         jtag_error = error;
 118 }
 119 int jtag_get_error(void)
 120 {
 121         return jtag_error;
 122 }
 123 int jtag_error_clear(void)
 124 {
 125         int temp = jtag_error;
 126         jtag_error = ERROR_OK;
 127         return temp;
 128 }
 129
 130
 131 jtag_tap_t *jtag_all_taps(void)
 132 {
 133         return __jtag_all_taps;
 134 };
 135
 136 unsigned jtag_tap_count(void)
 137 {
 138         return jtag_num_taps;
 139 }
 140
 141 unsigned jtag_tap_count_enabled(void)
 142 {
 143         jtag_tap_t *t = jtag_all_taps();
 144         unsigned n = 0;
 145         while (t)
 146         {
 147                 if (t->enabled)
 148                         n++;
 149                 t = t->next_tap;
 150         }
 151         return n;
 152 }
 153
 154 /// Append a new TAP to the chain of all taps.
 155 void jtag_tap_add(struct jtag_tap_s *t)
 156 {
 157         t->abs_chain_position = jtag_num_taps++;
 158
 159         jtag_tap_t **tap = &__jtag_all_taps;
 160         while (*tap != NULL)
 161                 tap = &(*tap)->next_tap;
 162         *tap = t;
 163 }
 164
 165 /* returns a pointer to the n-th device in the scan chain */
 166 static inline jtag_tap_t *jtag_tap_by_position(unsigned n)
 167 {
 168         jtag_tap_t *t = jtag_all_taps();
 169
 170         while (t && n-- > 0)
 171                 t = t->next_tap;
 172
 173         return t;
 174 }
 175
 176 jtag_tap_t *jtag_tap_by_string(const char *s)
 177 {
 178         /* try by name first */
 179         jtag_tap_t *t = jtag_all_taps();
 180
 181         while (t)
 182         {
 183                 if (0 == strcmp(t->dotted_name, s))
 184                         return t;
 185                 t = t->next_tap;
 186         }
 187
 188         /* no tap found by name, so try to parse the name as a number */
 189         unsigned n;
 190         if (parse_uint(s, &n) != ERROR_OK)
 191                 return NULL;
 192
 193         /* FIXME remove this numeric fallback code late June 2010, along
 194          * with all info in the User's Guide that TAPs have numeric IDs.
 195          * Also update "scan_chain" output to not display the numbers.
 196          */
 197         t = jtag_tap_by_position(n);
 198         if (t)
 199                 LOG_WARNING("Specify TAP '%s' by name, not number %u",
 200                         t->dotted_name, n);
 201
 202         return t;
 203 }
 204
 205 jtag_tap_t *jtag_tap_by_jim_obj(Jim_Interp *interp, Jim_Obj *o)
 206 {
 207         const char *cp = Jim_GetString(o, NULL);
 208         jtag_tap_t *t = cp ? jtag_tap_by_string(cp) : NULL;
 209         if (NULL == cp)
 210                 cp = "(unknown)";
 211         if (NULL == t)
 212                 Jim_SetResult_sprintf(interp, "Tap '%s' could not be found", cp);
 213         return t;
 214 }
 215
 216 jtag_tap_t* jtag_tap_next_enabled(jtag_tap_t* p)
 217 {
 218         p = p ? p->next_tap : jtag_all_taps();
 219         while (p)
 220         {
 221                 if (p->enabled)
 222                         return p;
 223                 p = p->next_tap;
 224         }
 225         return NULL;
 226 }
 227
 228 const char *jtag_tap_name(const jtag_tap_t *tap)
 229 {
 230         return (tap == NULL) ? "(unknown)" : tap->dotted_name;
 231 }
 232
 233
 234 int jtag_register_event_callback(jtag_event_handler_t callback, void *priv)
 235 {
 236         jtag_event_callback_t **callbacks_p = &jtag_event_callbacks;
 237
 238         if (callback == NULL)
 239         {
 240                 return ERROR_INVALID_ARGUMENTS;
 241         }
 242
 243         if (*callbacks_p)
 244         {
 245                 while ((*callbacks_p)->next)
 246                         callbacks_p = &((*callbacks_p)->next);
 247                 callbacks_p = &((*callbacks_p)->next);
 248         }
 249
 250         (*callbacks_p) = malloc(sizeof(jtag_event_callback_t));
 251         (*callbacks_p)->callback = callback;
 252         (*callbacks_p)->priv = priv;
 253         (*callbacks_p)->next = NULL;
 254
 255         return ERROR_OK;
 256 }
 257
 258 int jtag_unregister_event_callback(jtag_event_handler_t callback, void *priv)
 259 {
 260         jtag_event_callback_t **callbacks_p;
 261         jtag_event_callback_t **next;
 262
 263         if (callback == NULL)
 264         {
 265                 return ERROR_INVALID_ARGUMENTS;
 266         }
 267
 268         for (callbacks_p = &jtag_event_callbacks;
 269                         *callbacks_p != NULL;
 270                         callbacks_p = next)
 271         {
 272                 next = &((*callbacks_p)->next);
 273
 274                 if ((*callbacks_p)->priv != priv)
 275                         continue;
 276
 277                 if ((*callbacks_p)->callback == callback)
 278                 {
 279                         free(*callbacks_p);
 280                         *callbacks_p = *next;
 281                 }
 282         }
 283
 284         return ERROR_OK;
 285 }
 286
 287 int jtag_call_event_callbacks(enum jtag_event event)
 288 {
 289         jtag_event_callback_t *callback = jtag_event_callbacks;
 290
 291         LOG_DEBUG("jtag event: %s", jtag_event_strings[event]);
 292
 293         while (callback)
 294         {
 295                 jtag_event_callback_t *next;
 296
 297                 /* callback may remove itself */
 298                 next = callback->next;
 299                 callback->callback(event, callback->priv);
 300                 callback = next;
 301         }
 302
 303         return ERROR_OK;
 304 }
 305
 306 static void jtag_checks(void)
 307 {
 308         assert(jtag_trst == 0);
 309 }
 310
 311 static void jtag_prelude(tap_state_t state)
 312 {
 313         jtag_checks();
 314
 315         assert(state != TAP_INVALID);
 316
 317         cmd_queue_cur_state = state;
 318 }
 319
 320 void jtag_alloc_in_value32(scan_field_t *field)
 321 {
 322         interface_jtag_alloc_in_value32(field);
 323 }
 324
 325 void jtag_add_ir_scan_noverify(int in_count, const scan_field_t *in_fields,
 326                 tap_state_t state)
 327 {
 328         jtag_prelude(state);
 329
 330         int retval = interface_jtag_add_ir_scan(in_count, in_fields, state);
 331         jtag_set_error(retval);
 332 }
 333
 334
 335 void jtag_add_ir_scan(int in_num_fields, scan_field_t *in_fields, tap_state_t state)
 336 {
 337         if (jtag_verify && jtag_verify_capture_ir)
 338         {
 339                 /* 8 x 32 bit id's is enough for all invocations */
 340
 341                 for (int j = 0; j < in_num_fields; j++)
 342                 {
 343                         /* if we are to run a verification of the ir scan, we need to get the input back.
 344                          * We may have to allocate space if the caller didn't ask for the input back.
 345                          */
 346                         in_fields[j].check_value = in_fields[j].tap->expected;
 347                         in_fields[j].check_mask = in_fields[j].tap->expected_mask;
 348                 }
 349                 jtag_add_scan_check(jtag_add_ir_scan_noverify, in_num_fields, in_fields, state);
 350         } else
 351         {
 352                 jtag_add_ir_scan_noverify(in_num_fields, in_fields, state);
 353         }
 354 }
 355
 356 void jtag_add_plain_ir_scan(int in_num_fields, const scan_field_t *in_fields,
 357                 tap_state_t state)
 358 {
 359         jtag_prelude(state);
 360
 361         int retval = interface_jtag_add_plain_ir_scan(
 362                         in_num_fields, in_fields, state);
 363         jtag_set_error(retval);
 364 }
 365
 366 void jtag_add_callback(jtag_callback1_t f, jtag_callback_data_t data0)
 367 {
 368         interface_jtag_add_callback(f, data0);
 369 }
 370
 371 void jtag_add_callback4(jtag_callback_t f, jtag_callback_data_t data0,
 372                 jtag_callback_data_t data1, jtag_callback_data_t data2,
 373                 jtag_callback_data_t data3)
 374 {
 375         interface_jtag_add_callback4(f, data0, data1, data2, data3);
 376 }
 377
 378 int jtag_check_value_inner(uint8_t *captured, uint8_t *in_check_value, uint8_t *in_check_mask, int num_bits);
 379
 380 static int jtag_check_value_mask_callback(jtag_callback_data_t data0, jtag_callback_data_t data1, jtag_callback_data_t data2, jtag_callback_data_t data3)
 381 {
 382         return jtag_check_value_inner((uint8_t *)data0, (uint8_t *)data1, (uint8_t *)data2, (int)data3);
 383 }
 384
 385 static void jtag_add_scan_check(void (*jtag_add_scan)(int in_num_fields, const scan_field_t *in_fields, tap_state_t state),
 386                 int in_num_fields, scan_field_t *in_fields, tap_state_t state)
 387 {
 388         for (int i = 0; i < in_num_fields; i++)
 389         {
 390                 struct scan_field_s *field = &in_fields[i];
 391                 field->allocated = 0;
 392                 field->modified = 0;
 393                 if (field->check_value || field->in_value)
 394                         continue;
 395                 interface_jtag_add_scan_check_alloc(field);
 396                 field->modified = 1;
 397         }
 398
 399         jtag_add_scan(in_num_fields, in_fields, state);
 400
 401         for (int i = 0; i < in_num_fields; i++)
 402         {
 403                 if ((in_fields[i].check_value != NULL) && (in_fields[i].in_value != NULL))
 404                 {
 405                         /* this is synchronous for a minidriver */
 406                         jtag_add_callback4(jtag_check_value_mask_callback, (jtag_callback_data_t)in_fields[i].in_value,
 407                                 (jtag_callback_data_t)in_fields[i].check_value,
 408                                 (jtag_callback_data_t)in_fields[i].check_mask,
 409                                 (jtag_callback_data_t)in_fields[i].num_bits);
 410                 }
 411                 if (in_fields[i].allocated)
 412                 {
 413                         free(in_fields[i].in_value);
 414                 }
 415                 if (in_fields[i].modified)
 416                 {
 417                         in_fields[i].in_value = NULL;
 418                 }
 419         }
 420 }
 421
 422 void jtag_add_dr_scan_check(int in_num_fields, scan_field_t *in_fields, tap_state_t state)
 423 {
 424         if (jtag_verify)
 425         {
 426                 jtag_add_scan_check(jtag_add_dr_scan, in_num_fields, in_fields, state);
 427         } else
 428         {
 429                 jtag_add_dr_scan(in_num_fields, in_fields, state);
 430         }
 431 }
 432
 433
 434 void jtag_add_dr_scan(int in_num_fields, const scan_field_t *in_fields,
 435                 tap_state_t state)
 436 {
 437         jtag_prelude(state);
 438
 439         int retval;
 440         retval = interface_jtag_add_dr_scan(in_num_fields, in_fields, state);
 441         jtag_set_error(retval);
 442 }
 443
 444 void jtag_add_plain_dr_scan(int in_num_fields, const scan_field_t *in_fields,
 445                 tap_state_t state)
 446 {
 447         jtag_prelude(state);
 448
 449         int retval;
 450         retval = interface_jtag_add_plain_dr_scan(in_num_fields, in_fields, state);
 451         jtag_set_error(retval);
 452 }
 453
 454 void jtag_add_dr_out(jtag_tap_t* tap,
 455                 int num_fields, const int* num_bits, const uint32_t* value,
 456                 tap_state_t end_state)
 457 {
 458         assert(end_state != TAP_INVALID);
 459
 460         cmd_queue_cur_state = end_state;
 461
 462         interface_jtag_add_dr_out(tap,
 463                         num_fields, num_bits, value,
 464                         end_state);
 465 }
 466
 467 void jtag_add_tlr(void)
 468 {
 469         jtag_prelude(TAP_RESET);
 470         jtag_set_error(interface_jtag_add_tlr());
 471         jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
 472 }
 473
 474 void jtag_add_pathmove(int num_states, const tap_state_t *path)
 475 {
 476         tap_state_t cur_state = cmd_queue_cur_state;
 477
 478         /* the last state has to be a stable state */
 479         if (!tap_is_state_stable(path[num_states - 1]))
 480         {
 481                 LOG_ERROR("BUG: TAP path doesn't finish in a stable state");
 482                 jtag_set_error(ERROR_JTAG_NOT_STABLE_STATE);
 483                 return;
 484         }
 485
 486         for (int i = 0; i < num_states; i++)
 487         {
 488                 if (path[i] == TAP_RESET)
 489                 {
 490                         LOG_ERROR("BUG: TAP_RESET is not a valid state for pathmove sequences");
 491                         jtag_set_error(ERROR_JTAG_STATE_INVALID);
 492                         return;
 493                 }
 494
 495                 if (tap_state_transition(cur_state, true)  != path[i]
 496                   && tap_state_transition(cur_state, false) != path[i])
 497                 {
 498                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 499                                         tap_state_name(cur_state), tap_state_name(path[i]));
 500                         jtag_set_error(ERROR_JTAG_TRANSITION_INVALID);
 501                         return;
 502                 }
 503                 cur_state = path[i];
 504         }
 505
 506         jtag_checks();
 507
 508         jtag_set_error(interface_jtag_add_pathmove(num_states, path));
 509         cmd_queue_cur_state = path[num_states - 1];
 510 }
 511
 512 int jtag_add_statemove(tap_state_t goal_state)
 513 {
 514         tap_state_t cur_state = cmd_queue_cur_state;
 515
 516         LOG_DEBUG("cur_state=%s goal_state=%s",
 517                 tap_state_name(cur_state),
 518                 tap_state_name(goal_state));
 519
 520
 521         if (goal_state == cur_state)
 522                 ;       /* nothing to do */
 523         else if (goal_state == TAP_RESET)
 524         {
 525                 jtag_add_tlr();
 526         }
 527         else if (tap_is_state_stable(cur_state) && tap_is_state_stable(goal_state))
 528         {
 529                 unsigned tms_bits  = tap_get_tms_path(cur_state, goal_state);
 530                 unsigned tms_count = tap_get_tms_path_len(cur_state, goal_state);
 531                 tap_state_t moves[8];
 532                 assert(tms_count < DIM(moves));
 533
 534                 for (unsigned i = 0; i < tms_count; i++, tms_bits >>= 1)
 535                 {
 536                         bool bit = tms_bits & 1;
 537
 538                         cur_state = tap_state_transition(cur_state, bit);
 539                         moves[i] = cur_state;
 540                 }
 541
 542                 jtag_add_pathmove(tms_count, moves);
 543         }
 544         else if (tap_state_transition(cur_state, true)  == goal_state
 545                 ||   tap_state_transition(cur_state, false) == goal_state)
 546         {
 547                 jtag_add_pathmove(1, &goal_state);
 548         }
 549
 550         else
 551                 return ERROR_FAIL;
 552
 553         return ERROR_OK;
 554 }
 555
 556 void jtag_add_runtest(int num_cycles, tap_state_t state)
 557 {
 558         jtag_prelude(state);
 559         jtag_set_error(interface_jtag_add_runtest(num_cycles, state));
 560 }
 561
 562
 563 void jtag_add_clocks(int num_cycles)
 564 {
 565         if (!tap_is_state_stable(cmd_queue_cur_state))
 566         {
 567                  LOG_ERROR("jtag_add_clocks() called with TAP in unstable state \"%s\"",
 568                                  tap_state_name(cmd_queue_cur_state));
 569                  jtag_set_error(ERROR_JTAG_NOT_STABLE_STATE);
 570                  return;
 571         }
 572
 573         if (num_cycles > 0)
 574         {
 575                 jtag_checks();
 576                 jtag_set_error(interface_jtag_add_clocks(num_cycles));
 577         }
 578 }
 579
 580 void jtag_add_reset(int req_tlr_or_trst, int req_srst)
 581 {
 582         int trst_with_tlr = 0;
 583
 584         /* FIX!!! there are *many* different cases here. A better
 585          * approach is needed for legal combinations of transitions...
 586          */
 587         if ((jtag_reset_config & RESET_HAS_SRST)&&
 588                         (jtag_reset_config & RESET_HAS_TRST)&&
 589                         ((jtag_reset_config & RESET_SRST_PULLS_TRST) == 0))
 590         {
 591                 if (((req_tlr_or_trst&&!jtag_trst)||
 592                                 (!req_tlr_or_trst && jtag_trst))&&
 593                                 ((req_srst&&!jtag_srst)||
 594                                                 (!req_srst && jtag_srst)))
 595                 {
 596                         /* FIX!!! srst_pulls_trst allows 1,1 => 0,0 transition.... */
 597                         //LOG_ERROR("BUG: transition of req_tlr_or_trst and req_srst in the same jtag_add_reset() call is undefined");
 598                 }
 599         }
 600
 601         /* Make sure that jtag_reset_config allows the requested reset */
 602         /* if SRST pulls TRST, we can't fulfill srst == 1 with trst == 0 */
 603         if (((jtag_reset_config & RESET_SRST_PULLS_TRST) && (req_srst == 1)) && (!req_tlr_or_trst))
 604         {
 605                 LOG_ERROR("BUG: requested reset would assert trst");
 606                 jtag_set_error(ERROR_FAIL);
 607                 return;
 608         }
 609
 610         /* if TRST pulls SRST, we reset with TAP T-L-R */
 611         if (((jtag_reset_config & RESET_TRST_PULLS_SRST) && (req_tlr_or_trst)) && (req_srst == 0))
 612         {
 613                 trst_with_tlr = 1;
 614         }
 615
 616         if (req_srst && !(jtag_reset_config & RESET_HAS_SRST))
 617         {
 618                 LOG_ERROR("BUG: requested SRST assertion, but the current configuration doesn't support this");
 619                 jtag_set_error(ERROR_FAIL);
 620                 return;
 621         }
 622
 623         if (req_tlr_or_trst)
 624         {
 625                 if (!trst_with_tlr && (jtag_reset_config & RESET_HAS_TRST))
 626                 {
 627                         jtag_trst = 1;
 628                 } else
 629                 {
 630                         trst_with_tlr = 1;
 631                 }
 632         } else
 633         {
 634                 jtag_trst = 0;
 635         }
 636
 637         jtag_srst = req_srst;
 638
 639         int retval = interface_jtag_add_reset(jtag_trst, jtag_srst);
 640         if (retval != ERROR_OK)
 641         {
 642                 jtag_set_error(retval);
 643                 return;
 644         }
 645         jtag_execute_queue();
 646
 647         if (jtag_srst)
 648         {
 649                 LOG_DEBUG("SRST line asserted");
 650         }
 651         else
 652         {
 653                 LOG_DEBUG("SRST line released");
 654                 if (jtag_nsrst_delay)
 655                         jtag_add_sleep(jtag_nsrst_delay * 1000);
 656         }
 657
 658         if (trst_with_tlr)
 659         {
 660                 LOG_DEBUG("JTAG reset with RESET instead of TRST");
 661                 jtag_set_end_state(TAP_RESET);
 662                 jtag_add_tlr();
 663                 return;
 664         }
 665
 666         if (jtag_trst)
 667         {
 668                 /* we just asserted nTRST, so we're now in Test-Logic-Reset,
 669                  * and inform possible listeners about this
 670                  */
 671                 LOG_DEBUG("TRST line asserted");
 672                 tap_set_state(TAP_RESET);
 673                 jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
 674         }
 675         else
 676         {
 677                 if (jtag_ntrst_delay)
 678                         jtag_add_sleep(jtag_ntrst_delay * 1000);
 679         }
 680 }
 681
 682 tap_state_t jtag_set_end_state(tap_state_t state)
 683 {
 684         if ((state == TAP_DRSHIFT)||(state == TAP_IRSHIFT))
 685         {
 686                 LOG_ERROR("BUG: TAP_DRSHIFT/IRSHIFT can't be end state. Calling code should use a larger scan field");
 687         }
 688
 689         if (state != TAP_INVALID)
 690                 cmd_queue_end_state = state;
 691         return cmd_queue_end_state;
 692 }
 693
 694 tap_state_t jtag_get_end_state(void)
 695 {
 696         return cmd_queue_end_state;
 697 }
 698
 699 void jtag_add_sleep(uint32_t us)
 700 {
 701         /// @todo Here, keep_alive() appears to be a layering violation!!!
 702         keep_alive();
 703         jtag_set_error(interface_jtag_add_sleep(us));
 704 }
 705
 706 int jtag_check_value_inner(uint8_t *captured, uint8_t *in_check_value, uint8_t *in_check_mask, int num_bits)
 707 {
 708         int retval = ERROR_OK;
 709
 710         int compare_failed = 0;
 711
 712         if (in_check_mask)
 713                 compare_failed = buf_cmp_mask(captured, in_check_value, in_check_mask, num_bits);
 714         else
 715                 compare_failed = buf_cmp(captured, in_check_value, num_bits);
 716
 717         if (compare_failed) {
 718                 /* An error handler could have caught the failing check
 719                  * only report a problem when there wasn't a handler, or if the handler
 720                  * acknowledged the error
 721                  */
 722                 /*
 723                 LOG_WARNING("TAP %s:",
 724                                         jtag_tap_name(field->tap));
 725                                         */
 726                 if (compare_failed)
 727                 {
 728                         char *captured_char = buf_to_str(captured, (num_bits > DEBUG_JTAG_IOZ) ? DEBUG_JTAG_IOZ : num_bits, 16);
 729                         char *in_check_value_char = buf_to_str(in_check_value, (num_bits > DEBUG_JTAG_IOZ) ? DEBUG_JTAG_IOZ : num_bits, 16);
 730
 731                         if (in_check_mask)
 732                         {
 733                                 char *in_check_mask_char;
 734                                 in_check_mask_char = buf_to_str(in_check_mask, (num_bits > DEBUG_JTAG_IOZ) ? DEBUG_JTAG_IOZ : num_bits, 16);
 735                                 LOG_WARNING("value captured during scan didn't pass the requested check:");
 736                                 LOG_WARNING("captured: 0x%s check_value: 0x%s check_mask: 0x%s",
 737                                                         captured_char, in_check_value_char, in_check_mask_char);
 738                                 free(in_check_mask_char);
 739                         }
 740                         else
 741                         {
 742                                 LOG_WARNING("value captured during scan didn't pass the requested check: captured: 0x%s check_value: 0x%s", captured_char, in_check_value_char);
 743                         }
 744
 745                         free(captured_char);
 746                         free(in_check_value_char);
 747
 748                         retval = ERROR_JTAG_QUEUE_FAILED;
 749                 }
 750
 751         }
 752         return retval;
 753 }
 754
 755 void jtag_check_value_mask(scan_field_t *field, uint8_t *value, uint8_t *mask)
 756 {
 757         assert(field->in_value != NULL);
 758
 759         if (value == NULL)
 760         {
 761                 /* no checking to do */
 762                 return;
 763         }
 764
 765         jtag_execute_queue_noclear();
 766
 767         int retval = jtag_check_value_inner(field->in_value, value, mask, field->num_bits);
 768         jtag_set_error(retval);
 769 }
 770
 771
 772
 773 int default_interface_jtag_execute_queue(void)
 774 {
 775         if (NULL == jtag)
 776         {
 777                 LOG_ERROR("No JTAG interface configured yet.  "
 778                         "Issue 'init' command in startup scripts "
 779                         "before communicating with targets.");
 780                 return ERROR_FAIL;
 781         }
 782
 783         return jtag->execute_queue();
 784 }
 785
 786 void jtag_execute_queue_noclear(void)
 787 {
 788         jtag_flush_queue_count++;
 789         jtag_set_error(interface_jtag_execute_queue());
 790 }
 791
 792 int jtag_get_flush_queue_count(void)
 793 {
 794         return jtag_flush_queue_count;
 795 }
 796
 797 int jtag_execute_queue(void)
 798 {
 799         jtag_execute_queue_noclear();
 800         return jtag_error_clear();
 801 }
 802
 803 static int jtag_reset_callback(enum jtag_event event, void *priv)
 804 {
 805         jtag_tap_t *tap = priv;
 806
 807         LOG_DEBUG("-");
 808
 809         if (event == JTAG_TRST_ASSERTED)
 810         {
 811                 tap->enabled = !tap->disabled_after_reset;
 812
 813                 buf_set_ones(tap->cur_instr, tap->ir_length);
 814                 tap->bypass = 1;
 815         }
 816
 817         return ERROR_OK;
 818 }
 819
 820 void jtag_sleep(uint32_t us)
 821 {
 822         alive_sleep(us/1000);
 823 }
 824
 825 /// maximum number of JTAG devices expected in the chain
 826 #define JTAG_MAX_CHAIN_SIZE 20
 827
 828 #define EXTRACT_MFG(X)  (((X) & 0xffe) >> 1)
 829 #define EXTRACT_PART(X) (((X) & 0xffff000) >> 12)
 830 #define EXTRACT_VER(X)  (((X) & 0xf0000000) >> 28)
 831
 832 static int jtag_examine_chain_execute(uint8_t *idcode_buffer, unsigned num_idcode)
 833 {
 834         scan_field_t field = {
 835                         .tap = NULL,
 836                         .num_bits = num_idcode * 32,
 837                         .out_value = idcode_buffer,
 838                         .in_value = idcode_buffer,
 839                 };
 840
 841         // initialize to the end of chain ID value
 842         for (unsigned i = 0; i < JTAG_MAX_CHAIN_SIZE; i++)
 843                 buf_set_u32(idcode_buffer, i * 32, 32, 0x000000FF);
 844
 845         jtag_add_plain_dr_scan(1, &field, TAP_RESET);
 846         return jtag_execute_queue();
 847 }
 848
 849 static bool jtag_examine_chain_check(uint8_t *idcodes, unsigned count)
 850 {
 851         uint8_t zero_check = 0x0;
 852         uint8_t one_check = 0xff;
 853
 854         for (unsigned i = 0; i < count * 4; i++)
 855         {
 856                 zero_check |= idcodes[i];
 857                 one_check &= idcodes[i];
 858         }
 859
 860         /* if there wasn't a single non-zero bit or if all bits were one,
 861          * the scan is not valid */
 862         if (zero_check == 0x00 || one_check == 0xff)
 863         {
 864                 LOG_ERROR("JTAG communication failure: check connection, "
 865                         "JTAG interface, target power etc.");
 866                 return false;
 867         }
 868         return true;
 869 }
 870
 871 static void jtag_examine_chain_display(enum log_levels level, const char *msg,
 872                 const char *name, uint32_t idcode)
 873 {
 874         log_printf_lf(level, __FILE__, __LINE__, __FUNCTION__,
 875                                   "JTAG tap: %s %16.16s: 0x%08x "
 876                                   "(mfg: 0x%3.3x, part: 0x%4.4x, ver: 0x%1.1x)",
 877                                   name, msg,
 878                                   (unsigned int)idcode,
 879                                   (unsigned int)EXTRACT_MFG(idcode),
 880                                   (unsigned int)EXTRACT_PART(idcode),
 881                                   (unsigned int)EXTRACT_VER(idcode));
 882 }
 883
 884 static bool jtag_idcode_is_final(uint32_t idcode)
 885 {
 886                 return idcode == 0x000000FF || idcode == 0xFFFFFFFF;
 887 }
 888
 889 /**
 890  * This helper checks that remaining bits in the examined chain data are
 891  * all as expected, but a single JTAG device requires only 64 bits to be
 892  * read back correctly.  This can help identify and diagnose problems
 893  * with the JTAG chain earlier, gives more helpful/explicit error messages.
 894  */
 895 static void jtag_examine_chain_end(uint8_t *idcodes, unsigned count, unsigned max)
 896 {
 897         bool triggered = false;
 898         for (; count < max - 31; count += 32)
 899         {
 900                 uint32_t idcode = buf_get_u32(idcodes, count, 32);
 901                 // do not trigger the warning if the data looks good
 902                 if (!triggered && jtag_idcode_is_final(idcode))
 903                         continue;
 904                 LOG_WARNING("Unexpected idcode after end of chain: %d 0x%08x",
 905                                         count, (unsigned int)idcode);
 906                 triggered = true;
 907         }
 908 }
 909
 910 static bool jtag_examine_chain_match_tap(const struct jtag_tap_s *tap)
 911 {
 912         if (0 == tap->expected_ids_cnt)
 913         {
 914                 /// @todo Enable LOG_INFO to ask for reports about unknown TAP IDs.
 915 #if 0
 916                 LOG_INFO("Uknown JTAG TAP ID: 0x%08x", tap->idcode)
 917                 LOG_INFO("Please report the chip name and reported ID code to the openocd project");
 918 #endif
 919                 return true;
 920         }
 921
 922         /* Loop over the expected identification codes and test for a match */
 923         uint8_t ii;
 924         for (ii = 0; ii < tap->expected_ids_cnt; ii++)
 925         {
 926                 if (tap->idcode == tap->expected_ids[ii])
 927                         break;
 928         }
 929
 930         /* If none of the expected ids matched, log an error */
 931         if (ii != tap->expected_ids_cnt)
 932         {
 933                 LOG_INFO("JTAG Tap/device matched");
 934                 return true;
 935         }
 936         jtag_examine_chain_display(LOG_LVL_ERROR, "got",
 937                         tap->dotted_name, tap->idcode);
 938         for (ii = 0; ii < tap->expected_ids_cnt; ii++)
 939         {
 940                 char msg[32];
 941                 snprintf(msg, sizeof(msg), "expected %hhu of %hhu",
 942                                 ii + 1, tap->expected_ids_cnt);
 943                 jtag_examine_chain_display(LOG_LVL_ERROR, msg,
 944                                 tap->dotted_name, tap->expected_ids[ii]);
 945         }
 946         return false;
 947 }
 948
 949 /* Try to examine chain layout according to IEEE 1149.1 §12
 950  */
 951 int jtag_examine_chain(void)
 952 {
 953         uint8_t idcode_buffer[JTAG_MAX_CHAIN_SIZE * 4];
 954         unsigned device_count = 0;
 955
 956         jtag_examine_chain_execute(idcode_buffer, JTAG_MAX_CHAIN_SIZE);
 957
 958         if (!jtag_examine_chain_check(idcode_buffer, JTAG_MAX_CHAIN_SIZE))
 959                 return ERROR_JTAG_INIT_FAILED;
 960
 961         /* point at the 1st tap */
 962         jtag_tap_t *tap = jtag_tap_next_enabled(NULL);
 963         if (tap == NULL)
 964         {
 965                 LOG_ERROR("JTAG: No taps enabled?");
 966                 return ERROR_JTAG_INIT_FAILED;
 967         }
 968
 969         for (unsigned bit_count = 0; bit_count < (JTAG_MAX_CHAIN_SIZE * 32) - 31;)
 970         {
 971                 uint32_t idcode = buf_get_u32(idcode_buffer, bit_count, 32);
 972                 if ((idcode & 1) == 0)
 973                 {
 974                         /* LSB must not be 0, this indicates a device in bypass */
 975                         LOG_WARNING("Tap/Device does not have IDCODE");
 976                         idcode = 0;
 977
 978                         bit_count += 1;
 979                 }
 980                 else
 981                 {
 982                         /*
 983                          * End of chain (invalid manufacturer ID) some devices, such
 984                          * as AVR will output all 1's instead of TDI input value at
 985                          * end of chain.
 986                          */
 987                         if (jtag_idcode_is_final(idcode))
 988                         {
 989                                 jtag_examine_chain_end(idcode_buffer,
 990                                                 bit_count + 32, JTAG_MAX_CHAIN_SIZE * 32);
 991                                 break;
 992                         }
 993
 994                         jtag_examine_chain_display(LOG_LVL_INFO, "tap/device found",
 995                                         tap ? tap->dotted_name : "(not-named)",
 996                                         idcode);
 997
 998                         bit_count += 32;
 999                 }
1000                 device_count++;
1001                 if (!tap)
1002                         continue;
1003
1004                 tap->idcode = idcode;
1005
1006                 // ensure the TAP ID does matches what was expected
1007                 if (!jtag_examine_chain_match_tap(tap))
1008                         return ERROR_JTAG_INIT_FAILED;
1009
1010                 tap = jtag_tap_next_enabled(tap);
1011         }
1012
1013         /* see if number of discovered devices matches configuration */
1014         if (device_count != jtag_tap_count_enabled())
1015         {
1016                 LOG_ERROR("number of discovered devices in JTAG chain (%i) "
1017                                 "does not match (enabled) configuration (%i), total taps: %d",
1018                                 device_count, jtag_tap_count_enabled(), jtag_tap_count());
1019                 LOG_ERROR("check the config file and ensure proper JTAG communication"
1020                                 " (connections, speed, ...)");
1021                 return ERROR_JTAG_INIT_FAILED;
1022         }
1023
1024         return ERROR_OK;
1025 }
1026
1027 int jtag_validate_chain(void)
1028 {
1029         jtag_tap_t *tap;
1030         int total_ir_length = 0;
1031         uint8_t *ir_test = NULL;
1032         scan_field_t field;
1033         int chain_pos = 0;
1034
1035         tap = NULL;
1036         total_ir_length = 0;
1037         for (;;) {
1038                 tap = jtag_tap_next_enabled(tap);
1039                 if (tap == NULL) {
1040                         break;
1041                 }
1042                 total_ir_length += tap->ir_length;
1043         }
1044
1045         total_ir_length += 2;
1046         ir_test = malloc(CEIL(total_ir_length, 8));
1047         buf_set_ones(ir_test, total_ir_length);
1048
1049         field.tap = NULL;
1050         field.num_bits = total_ir_length;
1051         field.out_value = ir_test;
1052         field.in_value = ir_test;
1053
1054
1055         jtag_add_plain_ir_scan(1, &field, TAP_RESET);
1056         jtag_execute_queue();
1057
1058         tap = NULL;
1059         chain_pos = 0;
1060         int val;
1061         for (;;) {
1062                 tap = jtag_tap_next_enabled(tap);
1063                 if (tap == NULL) {
1064                         break;
1065                 }
1066
1067                 val = buf_get_u32(ir_test, chain_pos, 2);
1068                 if (val != 0x1)
1069                 {
1070                         char *cbuf = buf_to_str(ir_test, total_ir_length, 16);
1071                         LOG_ERROR("Could not validate JTAG scan chain, IR mismatch, scan returned 0x%s. tap=%s pos=%d expected 0x1 got %0x", cbuf, jtag_tap_name(tap), chain_pos, val);
1072                         free(cbuf);
1073                         free(ir_test);
1074                         return ERROR_JTAG_INIT_FAILED;
1075                 }
1076                 chain_pos += tap->ir_length;
1077         }
1078
1079         val = buf_get_u32(ir_test, chain_pos, 2);
1080         if (val != 0x3)
1081         {
1082                 char *cbuf = buf_to_str(ir_test, total_ir_length, 16);
1083                 LOG_ERROR("Could not validate end of JTAG scan chain, IR mismatch, scan returned 0x%s. pos=%d expected 0x3 got %0x", cbuf, chain_pos, val);
1084                 free(cbuf);
1085                 free(ir_test);
1086                 return ERROR_JTAG_INIT_FAILED;
1087         }
1088
1089         free(ir_test);
1090
1091         return ERROR_OK;
1092 }
1093
1094
1095 void jtag_tap_init(jtag_tap_t *tap)
1096 {
1097         assert(0 != tap->ir_length);
1098
1099         tap->expected = malloc(tap->ir_length);
1100         tap->expected_mask = malloc(tap->ir_length);
1101         tap->cur_instr = malloc(tap->ir_length);
1102
1103         /// @todo cope sanely with ir_length bigger than 32 bits
1104         buf_set_u32(tap->expected, 0, tap->ir_length, tap->ir_capture_value);
1105         buf_set_u32(tap->expected_mask, 0, tap->ir_length, tap->ir_capture_mask);
1106         buf_set_ones(tap->cur_instr, tap->ir_length);
1107
1108         // place TAP in bypass mode
1109         tap->bypass = 1;
1110         // register the reset callback for the TAP
1111         jtag_register_event_callback(&jtag_reset_callback, tap);
1112
1113         LOG_DEBUG("Created Tap: %s @ abs position %d, "
1114                         "irlen %d, capture: 0x%x mask: 0x%x", tap->dotted_name,
1115                                 tap->abs_chain_position, tap->ir_length,
1116                           (unsigned int)(tap->ir_capture_value), (unsigned int)(tap->ir_capture_mask));
1117         jtag_tap_add(tap);
1118 }
1119
1120 void jtag_tap_free(jtag_tap_t *tap)
1121 {
1122         jtag_unregister_event_callback(&jtag_reset_callback, tap);
1123
1124         /// @todo is anything missing? no memory leaks please
1125         free((void *)tap->expected_ids);
1126         free((void *)tap->chip);
1127         free((void *)tap->tapname);
1128         free((void *)tap->dotted_name);
1129         free(tap);
1130 }
1131
1132 int jtag_interface_init(struct command_context_s *cmd_ctx)
1133 {
1134         if (jtag)
1135                 return ERROR_OK;
1136
1137         if (!jtag_interface)
1138         {
1139                 /* nothing was previously specified by "interface" command */
1140                 LOG_ERROR("JTAG interface has to be specified, see \"interface\" command");
1141                 return ERROR_JTAG_INVALID_INTERFACE;
1142         }
1143         if (hasKHz)
1144         {
1145                 jtag_interface->khz(jtag_get_speed_khz(), &jtag_speed);
1146                 hasKHz = false;
1147         }
1148
1149         if (jtag_interface->init() != ERROR_OK)
1150                 return ERROR_JTAG_INIT_FAILED;
1151
1152         jtag = jtag_interface;
1153         return ERROR_OK;
1154 }
1155
1156 static int jtag_init_inner(struct command_context_s *cmd_ctx)
1157 {
1158         jtag_tap_t *tap;
1159         int retval;
1160
1161         LOG_DEBUG("Init JTAG chain");
1162
1163         tap = jtag_tap_next_enabled(NULL);
1164         if (tap == NULL) {
1165                 LOG_ERROR("There are no enabled taps?");
1166                 return ERROR_JTAG_INIT_FAILED;
1167         }
1168
1169         jtag_add_tlr();
1170         if ((retval = jtag_execute_queue()) != ERROR_OK)
1171                 return retval;
1172
1173         /* examine chain first, as this could discover the real chain layout */
1174         if (jtag_examine_chain() != ERROR_OK)
1175         {
1176                 LOG_ERROR("trying to validate configured JTAG chain anyway...");
1177         }
1178
1179         if (jtag_validate_chain() != ERROR_OK)
1180         {
1181                 LOG_WARNING("Could not validate JTAG chain, continuing anyway...");
1182         }
1183
1184         return ERROR_OK;
1185 }
1186
1187 int jtag_interface_quit(void)
1188 {
1189         if (!jtag || !jtag->quit)
1190                 return ERROR_OK;
1191
1192         // close the JTAG interface
1193         int result = jtag->quit();
1194         if (ERROR_OK != result)
1195                 LOG_ERROR("failed: %d", result);
1196
1197         return ERROR_OK;
1198 }
1199
1200
1201 int jtag_init_reset(struct command_context_s *cmd_ctx)
1202 {
1203         int retval;
1204
1205         if ((retval = jtag_interface_init(cmd_ctx)) != ERROR_OK)
1206                 return retval;
1207
1208         LOG_DEBUG("Trying to bring the JTAG controller to life by asserting TRST / RESET");
1209
1210         /* Reset can happen after a power cycle.
1211          *
1212          * Ideally we would only assert TRST or run RESET before the target reset.
1213          *
1214          * However w/srst_pulls_trst, trst is asserted together with the target
1215          * reset whether we want it or not.
1216          *
1217          * NB! Some targets have JTAG circuitry disabled until a
1218          * trst & srst has been asserted.
1219          *
1220          * NB! here we assume nsrst/ntrst delay are sufficient!
1221          *
1222          * NB! order matters!!!! srst *can* disconnect JTAG circuitry
1223          *
1224          */
1225         jtag_add_reset(1, 0); /* RESET or TRST */
1226         if (jtag_reset_config & RESET_HAS_SRST)
1227         {
1228                 jtag_add_reset(1, 1);
1229                 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) == 0)
1230                         jtag_add_reset(0, 1);
1231         }
1232         jtag_add_reset(0, 0);
1233         if ((retval = jtag_execute_queue()) != ERROR_OK)
1234                 return retval;
1235
1236         /* Check that we can communication on the JTAG chain + eventually we want to
1237          * be able to perform enumeration only after OpenOCD has started
1238          * telnet and GDB server
1239          *
1240          * That would allow users to more easily perform any magic they need to before
1241          * reset happens.
1242          */
1243         return jtag_init_inner(cmd_ctx);
1244 }
1245
1246 int jtag_init(struct command_context_s *cmd_ctx)
1247 {
1248         int retval;
1249         if ((retval = jtag_interface_init(cmd_ctx)) != ERROR_OK)
1250                 return retval;
1251         if (jtag_init_inner(cmd_ctx) == ERROR_OK)
1252         {
1253                 return ERROR_OK;
1254         }
1255         return jtag_init_reset(cmd_ctx);
1256 }
1257
1258 void jtag_set_speed_khz(unsigned khz)
1259 {
1260         speed_khz = khz;
1261 }
1262 unsigned jtag_get_speed_khz(void)
1263 {
1264         return speed_khz;
1265 }
1266 int jtag_config_khz(unsigned khz)
1267 {
1268         LOG_DEBUG("handle jtag khz");
1269         jtag_set_speed_khz(khz);
1270
1271         int cur_speed = 0;
1272         if (jtag != NULL)
1273         {
1274                 LOG_DEBUG("have interface set up");
1275                 int speed_div1;
1276                 int retval = jtag->khz(jtag_get_speed_khz(), &speed_div1);
1277                 if (ERROR_OK != retval)
1278                 {
1279                         jtag_set_speed_khz(0);
1280                         return retval;
1281                 }
1282                 cur_speed = speed_div1;
1283         }
1284         return jtag_set_speed(cur_speed);
1285 }
1286
1287 int jtag_get_speed(void)
1288 {
1289         return jtag_speed;
1290 }
1291
1292 int jtag_set_speed(int speed)
1293 {
1294         jtag_speed = speed;
1295         /* this command can be called during CONFIG,
1296          * in which case jtag isn't initialized */
1297         hasKHz = !jtag;
1298         return jtag ? jtag->speed(speed) : ERROR_OK;
1299 }
1300
1301 int jtag_get_speed_readable(int *speed)
1302 {
1303         return jtag ? jtag->speed_div(jtag_get_speed(), speed) : ERROR_OK;
1304 }
1305
1306
1307 void jtag_set_verify(bool enable)
1308 {
1309         jtag_verify = enable;
1310 }
1311
1312 bool jtag_will_verify()
1313 {
1314         return jtag_verify;
1315 }
1316
1317 void jtag_set_verify_capture_ir(bool enable)
1318 {
1319         jtag_verify_capture_ir = enable;
1320 }
1321
1322 bool jtag_will_verify_capture_ir()
1323 {
1324         return jtag_verify_capture_ir;
1325 }
1326
1327 int jtag_power_dropout(int *dropout)
1328 {
1329         return jtag->power_dropout(dropout);
1330 }
1331
1332 int jtag_srst_asserted(int *srst_asserted)
1333 {
1334         return jtag->srst_asserted(srst_asserted);
1335 }
1336
1337 enum reset_types jtag_get_reset_config(void)
1338 {
1339         return jtag_reset_config;
1340 }
1341 void jtag_set_reset_config(enum reset_types type)
1342 {
1343         jtag_reset_config = type;
1344 }
1345
1346 int jtag_get_trst(void)
1347 {
1348         return jtag_trst;
1349 }
1350 int jtag_get_srst(void)
1351 {
1352         return jtag_srst;
1353 }
1354
1355 void jtag_set_nsrst_delay(unsigned delay)
1356 {
1357         jtag_nsrst_delay = delay;
1358 }
1359 unsigned jtag_get_nsrst_delay(void)
1360 {
1361         return jtag_nsrst_delay;
1362 }
1363 void jtag_set_ntrst_delay(unsigned delay)
1364 {
1365         jtag_ntrst_delay = delay;
1366 }
1367 unsigned jtag_get_ntrst_delay(void)
1368 {
1369         return jtag_ntrst_delay;
1370 }