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 (TLR or TRST)",
  64         [JTAG_TAP_EVENT_ENABLE] = "TAP enabled",
  65         [JTAG_TAP_EVENT_POST_RESET] = "post reset",
  66         [JTAG_TAP_EVENT_DISABLE] = "TAP disabled",
  67 };
  68
  69 /*
  70  * JTAG adapters must initialize with TRST and SRST de-asserted
  71  * (they're negative logic, so that means *high*)
  72  */
  73 static int jtag_trst = 0;
  74 static int jtag_srst = 0;
  75
  76 /**
  77  * List all TAPs that have been created.
  78  */
  79 static jtag_tap_t *__jtag_all_taps = NULL;
  80 /**
  81  * The number of TAPs in the __jtag_all_taps list, used to track the
  82  * assigned chain position to new TAPs
  83  */
  84 static unsigned jtag_num_taps = 0;
  85
  86 static enum reset_types jtag_reset_config = RESET_NONE;
  87 static tap_state_t cmd_queue_end_state = TAP_RESET;
  88 tap_state_t cmd_queue_cur_state = TAP_RESET;
  89
  90 static bool jtag_verify_capture_ir = true;
  91 static int jtag_verify = 1;
  92
  93 /* how long the OpenOCD should wait before attempting JTAG communication after reset lines deasserted (in ms) */
  94 static int jtag_nsrst_delay = 0; /* default to no nSRST delay */
  95 static int jtag_ntrst_delay = 0; /* default to no nTRST delay */
  96
  97 typedef struct jtag_event_callback_s
  98 {
  99         jtag_event_handler_t          callback;
 100         void*                         priv;
 101         struct jtag_event_callback_s* next;
 102 } jtag_event_callback_t;
 103
 104 /* callbacks to inform high-level handlers about JTAG state changes */
 105 static jtag_event_callback_t *jtag_event_callbacks;
 106
 107 /* speed in kHz*/
 108 static int speed_khz = 0;
 109 /* speed to fallback to when RCLK is requested but not supported */
 110 static int rclk_fallback_speed_khz = 0;
 111 static enum {CLOCK_MODE_SPEED, CLOCK_MODE_KHZ, CLOCK_MODE_RCLK} clock_mode;
 112 static int jtag_speed = 0;
 113
 114 static struct jtag_interface_s *jtag = NULL;
 115
 116 /* configuration */
 117 jtag_interface_t *jtag_interface = NULL;
 118
 119 void jtag_set_error(int error)
 120 {
 121         if ((error == ERROR_OK) || (jtag_error != ERROR_OK))
 122                 return;
 123         jtag_error = error;
 124 }
 125 int jtag_get_error(void)
 126 {
 127         return jtag_error;
 128 }
 129 int jtag_error_clear(void)
 130 {
 131         int temp = jtag_error;
 132         jtag_error = ERROR_OK;
 133         return temp;
 134 }
 135
 136
 137 jtag_tap_t *jtag_all_taps(void)
 138 {
 139         return __jtag_all_taps;
 140 };
 141
 142 unsigned jtag_tap_count(void)
 143 {
 144         return jtag_num_taps;
 145 }
 146
 147 unsigned jtag_tap_count_enabled(void)
 148 {
 149         jtag_tap_t *t = jtag_all_taps();
 150         unsigned n = 0;
 151         while (t)
 152         {
 153                 if (t->enabled)
 154                         n++;
 155                 t = t->next_tap;
 156         }
 157         return n;
 158 }
 159
 160 /// Append a new TAP to the chain of all taps.
 161 void jtag_tap_add(struct jtag_tap_s *t)
 162 {
 163         t->abs_chain_position = jtag_num_taps++;
 164
 165         jtag_tap_t **tap = &__jtag_all_taps;
 166         while (*tap != NULL)
 167                 tap = &(*tap)->next_tap;
 168         *tap = t;
 169 }
 170
 171 /* returns a pointer to the n-th device in the scan chain */
 172 static inline jtag_tap_t *jtag_tap_by_position(unsigned n)
 173 {
 174         jtag_tap_t *t = jtag_all_taps();
 175
 176         while (t && n-- > 0)
 177                 t = t->next_tap;
 178
 179         return t;
 180 }
 181
 182 jtag_tap_t *jtag_tap_by_string(const char *s)
 183 {
 184         /* try by name first */
 185         jtag_tap_t *t = jtag_all_taps();
 186
 187         while (t)
 188         {
 189                 if (0 == strcmp(t->dotted_name, s))
 190                         return t;
 191                 t = t->next_tap;
 192         }
 193
 194         /* no tap found by name, so try to parse the name as a number */
 195         unsigned n;
 196         if (parse_uint(s, &n) != ERROR_OK)
 197                 return NULL;
 198
 199         /* FIXME remove this numeric fallback code late June 2010, along
 200          * with all info in the User's Guide that TAPs have numeric IDs.
 201          * Also update "scan_chain" output to not display the numbers.
 202          */
 203         t = jtag_tap_by_position(n);
 204         if (t)
 205                 LOG_WARNING("Specify TAP '%s' by name, not number %u",
 206                         t->dotted_name, n);
 207
 208         return t;
 209 }
 210
 211 jtag_tap_t *jtag_tap_by_jim_obj(Jim_Interp *interp, Jim_Obj *o)
 212 {
 213         const char *cp = Jim_GetString(o, NULL);
 214         jtag_tap_t *t = cp ? jtag_tap_by_string(cp) : NULL;
 215         if (NULL == cp)
 216                 cp = "(unknown)";
 217         if (NULL == t)
 218                 Jim_SetResult_sprintf(interp, "Tap '%s' could not be found", cp);
 219         return t;
 220 }
 221
 222 jtag_tap_t* jtag_tap_next_enabled(jtag_tap_t* p)
 223 {
 224         p = p ? p->next_tap : jtag_all_taps();
 225         while (p)
 226         {
 227                 if (p->enabled)
 228                         return p;
 229                 p = p->next_tap;
 230         }
 231         return NULL;
 232 }
 233
 234 const char *jtag_tap_name(const jtag_tap_t *tap)
 235 {
 236         return (tap == NULL) ? "(unknown)" : tap->dotted_name;
 237 }
 238
 239
 240 int jtag_register_event_callback(jtag_event_handler_t callback, void *priv)
 241 {
 242         jtag_event_callback_t **callbacks_p = &jtag_event_callbacks;
 243
 244         if (callback == NULL)
 245         {
 246                 return ERROR_INVALID_ARGUMENTS;
 247         }
 248
 249         if (*callbacks_p)
 250         {
 251                 while ((*callbacks_p)->next)
 252                         callbacks_p = &((*callbacks_p)->next);
 253                 callbacks_p = &((*callbacks_p)->next);
 254         }
 255
 256         (*callbacks_p) = malloc(sizeof(jtag_event_callback_t));
 257         (*callbacks_p)->callback = callback;
 258         (*callbacks_p)->priv = priv;
 259         (*callbacks_p)->next = NULL;
 260
 261         return ERROR_OK;
 262 }
 263
 264 int jtag_unregister_event_callback(jtag_event_handler_t callback, void *priv)
 265 {
 266         jtag_event_callback_t **callbacks_p;
 267         jtag_event_callback_t **next;
 268
 269         if (callback == NULL)
 270         {
 271                 return ERROR_INVALID_ARGUMENTS;
 272         }
 273
 274         for (callbacks_p = &jtag_event_callbacks;
 275                         *callbacks_p != NULL;
 276                         callbacks_p = next)
 277         {
 278                 next = &((*callbacks_p)->next);
 279
 280                 if ((*callbacks_p)->priv != priv)
 281                         continue;
 282
 283                 if ((*callbacks_p)->callback == callback)
 284                 {
 285                         free(*callbacks_p);
 286                         *callbacks_p = *next;
 287                 }
 288         }
 289
 290         return ERROR_OK;
 291 }
 292
 293 int jtag_call_event_callbacks(enum jtag_event event)
 294 {
 295         jtag_event_callback_t *callback = jtag_event_callbacks;
 296
 297         LOG_DEBUG("jtag event: %s", jtag_event_strings[event]);
 298
 299         while (callback)
 300         {
 301                 jtag_event_callback_t *next;
 302
 303                 /* callback may remove itself */
 304                 next = callback->next;
 305                 callback->callback(event, callback->priv);
 306                 callback = next;
 307         }
 308
 309         return ERROR_OK;
 310 }
 311
 312 static void jtag_checks(void)
 313 {
 314         assert(jtag_trst == 0);
 315 }
 316
 317 static void jtag_prelude(tap_state_t state)
 318 {
 319         jtag_checks();
 320
 321         assert(state != TAP_INVALID);
 322
 323         cmd_queue_cur_state = state;
 324 }
 325
 326 void jtag_alloc_in_value32(scan_field_t *field)
 327 {
 328         interface_jtag_alloc_in_value32(field);
 329 }
 330
 331 void jtag_add_ir_scan_noverify(int in_count, const scan_field_t *in_fields,
 332                 tap_state_t state)
 333 {
 334         jtag_prelude(state);
 335
 336         int retval = interface_jtag_add_ir_scan(in_count, in_fields, state);
 337         jtag_set_error(retval);
 338 }
 339
 340
 341 void jtag_add_ir_scan(int in_num_fields, scan_field_t *in_fields, tap_state_t state)
 342 {
 343         assert(state != TAP_RESET);
 344
 345         if (jtag_verify && jtag_verify_capture_ir)
 346         {
 347                 /* 8 x 32 bit id's is enough for all invocations */
 348
 349                 for (int j = 0; j < in_num_fields; j++)
 350                 {
 351                         /* if we are to run a verification of the ir scan, we need to get the input back.
 352                          * We may have to allocate space if the caller didn't ask for the input back.
 353                          */
 354                         in_fields[j].check_value = in_fields[j].tap->expected;
 355                         in_fields[j].check_mask = in_fields[j].tap->expected_mask;
 356                 }
 357                 jtag_add_scan_check(jtag_add_ir_scan_noverify, in_num_fields, in_fields, state);
 358         } else
 359         {
 360                 jtag_add_ir_scan_noverify(in_num_fields, in_fields, state);
 361         }
 362 }
 363
 364 void jtag_add_plain_ir_scan(int in_num_fields, const scan_field_t *in_fields,
 365                 tap_state_t state)
 366 {
 367         assert(state != TAP_RESET);
 368
 369         jtag_prelude(state);
 370
 371         int retval = interface_jtag_add_plain_ir_scan(
 372                         in_num_fields, in_fields, state);
 373         jtag_set_error(retval);
 374 }
 375
 376 void jtag_add_callback(jtag_callback1_t f, jtag_callback_data_t data0)
 377 {
 378         interface_jtag_add_callback(f, data0);
 379 }
 380
 381 void jtag_add_callback4(jtag_callback_t f, jtag_callback_data_t data0,
 382                 jtag_callback_data_t data1, jtag_callback_data_t data2,
 383                 jtag_callback_data_t data3)
 384 {
 385         interface_jtag_add_callback4(f, data0, data1, data2, data3);
 386 }
 387
 388 int jtag_check_value_inner(uint8_t *captured, uint8_t *in_check_value, uint8_t *in_check_mask, int num_bits);
 389
 390 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)
 391 {
 392         return jtag_check_value_inner((uint8_t *)data0, (uint8_t *)data1, (uint8_t *)data2, (int)data3);
 393 }
 394
 395 static void jtag_add_scan_check(void (*jtag_add_scan)(int in_num_fields, const scan_field_t *in_fields, tap_state_t state),
 396                 int in_num_fields, scan_field_t *in_fields, tap_state_t state)
 397 {
 398         for (int i = 0; i < in_num_fields; i++)
 399         {
 400                 struct scan_field_s *field = &in_fields[i];
 401                 field->allocated = 0;
 402                 field->modified = 0;
 403                 if (field->check_value || field->in_value)
 404                         continue;
 405                 interface_jtag_add_scan_check_alloc(field);
 406                 field->modified = 1;
 407         }
 408
 409         jtag_add_scan(in_num_fields, in_fields, state);
 410
 411         for (int i = 0; i < in_num_fields; i++)
 412         {
 413                 if ((in_fields[i].check_value != NULL) && (in_fields[i].in_value != NULL))
 414                 {
 415                         /* this is synchronous for a minidriver */
 416                         jtag_add_callback4(jtag_check_value_mask_callback, (jtag_callback_data_t)in_fields[i].in_value,
 417                                 (jtag_callback_data_t)in_fields[i].check_value,
 418                                 (jtag_callback_data_t)in_fields[i].check_mask,
 419                                 (jtag_callback_data_t)in_fields[i].num_bits);
 420                 }
 421                 if (in_fields[i].allocated)
 422                 {
 423                         free(in_fields[i].in_value);
 424                 }
 425                 if (in_fields[i].modified)
 426                 {
 427                         in_fields[i].in_value = NULL;
 428                 }
 429         }
 430 }
 431
 432 void jtag_add_dr_scan_check(int in_num_fields, scan_field_t *in_fields, tap_state_t state)
 433 {
 434         if (jtag_verify)
 435         {
 436                 jtag_add_scan_check(jtag_add_dr_scan, in_num_fields, in_fields, state);
 437         } else
 438         {
 439                 jtag_add_dr_scan(in_num_fields, in_fields, state);
 440         }
 441 }
 442
 443
 444 void jtag_add_dr_scan(int in_num_fields, const scan_field_t *in_fields,
 445                 tap_state_t state)
 446 {
 447         assert(state != TAP_RESET);
 448
 449         jtag_prelude(state);
 450
 451         int retval;
 452         retval = interface_jtag_add_dr_scan(in_num_fields, in_fields, state);
 453         jtag_set_error(retval);
 454 }
 455
 456 void jtag_add_plain_dr_scan(int in_num_fields, const scan_field_t *in_fields,
 457                 tap_state_t state)
 458 {
 459         assert(state != TAP_RESET);
 460
 461         jtag_prelude(state);
 462
 463         int retval;
 464         retval = interface_jtag_add_plain_dr_scan(in_num_fields, in_fields, state);
 465         jtag_set_error(retval);
 466 }
 467
 468 void jtag_add_dr_out(jtag_tap_t* tap,
 469                 int num_fields, const int* num_bits, const uint32_t* value,
 470                 tap_state_t end_state)
 471 {
 472         assert(end_state != TAP_RESET);
 473
 474         assert(end_state != TAP_INVALID);
 475
 476         cmd_queue_cur_state = end_state;
 477
 478         interface_jtag_add_dr_out(tap,
 479                         num_fields, num_bits, value,
 480                         end_state);
 481 }
 482
 483 void jtag_add_tlr(void)
 484 {
 485         jtag_prelude(TAP_RESET);
 486         jtag_set_error(interface_jtag_add_tlr());
 487
 488         jtag_notify_reset();
 489
 490         jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
 491 }
 492
 493 void jtag_add_pathmove(int num_states, const tap_state_t *path)
 494 {
 495         tap_state_t cur_state = cmd_queue_cur_state;
 496
 497         /* the last state has to be a stable state */
 498         if (!tap_is_state_stable(path[num_states - 1]))
 499         {
 500                 LOG_ERROR("BUG: TAP path doesn't finish in a stable state");
 501                 jtag_set_error(ERROR_JTAG_NOT_STABLE_STATE);
 502                 return;
 503         }
 504
 505         for (int i = 0; i < num_states; i++)
 506         {
 507                 if (path[i] == TAP_RESET)
 508                 {
 509                         LOG_ERROR("BUG: TAP_RESET is not a valid state for pathmove sequences");
 510                         jtag_set_error(ERROR_JTAG_STATE_INVALID);
 511                         return;
 512                 }
 513
 514                 if (tap_state_transition(cur_state, true)  != path[i]
 515                   && tap_state_transition(cur_state, false) != path[i])
 516                 {
 517                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 518                                         tap_state_name(cur_state), tap_state_name(path[i]));
 519                         jtag_set_error(ERROR_JTAG_TRANSITION_INVALID);
 520                         return;
 521                 }
 522                 cur_state = path[i];
 523         }
 524
 525         jtag_checks();
 526
 527         jtag_set_error(interface_jtag_add_pathmove(num_states, path));
 528         cmd_queue_cur_state = path[num_states - 1];
 529 }
 530
 531 int jtag_add_statemove(tap_state_t goal_state)
 532 {
 533         tap_state_t cur_state = cmd_queue_cur_state;
 534
 535         LOG_DEBUG("cur_state=%s goal_state=%s",
 536                 tap_state_name(cur_state),
 537                 tap_state_name(goal_state));
 538
 539
 540         if (goal_state == cur_state)
 541                 ;       /* nothing to do */
 542         else if (goal_state == TAP_RESET)
 543         {
 544                 jtag_add_tlr();
 545         }
 546         else if (tap_is_state_stable(cur_state) && tap_is_state_stable(goal_state))
 547         {
 548                 unsigned tms_bits  = tap_get_tms_path(cur_state, goal_state);
 549                 unsigned tms_count = tap_get_tms_path_len(cur_state, goal_state);
 550                 tap_state_t moves[8];
 551                 assert(tms_count < DIM(moves));
 552
 553                 for (unsigned i = 0; i < tms_count; i++, tms_bits >>= 1)
 554                 {
 555                         bool bit = tms_bits & 1;
 556
 557                         cur_state = tap_state_transition(cur_state, bit);
 558                         moves[i] = cur_state;
 559                 }
 560
 561                 jtag_add_pathmove(tms_count, moves);
 562         }
 563         else if (tap_state_transition(cur_state, true)  == goal_state
 564                 ||   tap_state_transition(cur_state, false) == goal_state)
 565         {
 566                 jtag_add_pathmove(1, &goal_state);
 567         }
 568
 569         else
 570                 return ERROR_FAIL;
 571
 572         return ERROR_OK;
 573 }
 574
 575 void jtag_add_runtest(int num_cycles, tap_state_t state)
 576 {
 577         jtag_prelude(state);
 578         jtag_set_error(interface_jtag_add_runtest(num_cycles, state));
 579 }
 580
 581
 582 void jtag_add_clocks(int num_cycles)
 583 {
 584         if (!tap_is_state_stable(cmd_queue_cur_state))
 585         {
 586                  LOG_ERROR("jtag_add_clocks() called with TAP in unstable state \"%s\"",
 587                                  tap_state_name(cmd_queue_cur_state));
 588                  jtag_set_error(ERROR_JTAG_NOT_STABLE_STATE);
 589                  return;
 590         }
 591
 592         if (num_cycles > 0)
 593         {
 594                 jtag_checks();
 595                 jtag_set_error(interface_jtag_add_clocks(num_cycles));
 596         }
 597 }
 598
 599 void jtag_add_reset(int req_tlr_or_trst, int req_srst)
 600 {
 601         int trst_with_tlr = 0;
 602         int new_srst = 0;
 603         int new_trst = 0;
 604
 605         /* Without SRST, we must use target-specific JTAG operations
 606          * on each target; callers should not be requesting SRST when
 607          * that signal doesn't exist.
 608          *
 609          * RESET_SRST_PULLS_TRST is a board or chip level quirk, which
 610          * can kick in even if the JTAG adapter can't drive TRST.
 611          */
 612         if (req_srst) {
 613                 if (!(jtag_reset_config & RESET_HAS_SRST)) {
 614                         LOG_ERROR("BUG: can't assert SRST");
 615                         jtag_set_error(ERROR_FAIL);
 616                         return;
 617                 }
 618                 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) != 0
 619                                 && !req_tlr_or_trst) {
 620                         LOG_ERROR("BUG: can't assert only SRST");
 621                         jtag_set_error(ERROR_FAIL);
 622                         return;
 623                 }
 624                 new_srst = 1;
 625         }
 626
 627         /* JTAG reset (entry to TAP_RESET state) can always be achieved
 628          * using TCK and TMS; that may go through a TAP_{IR,DR}UPDATE
 629          * state first.  TRST accelerates it, and bypasses those states.
 630          *
 631          * RESET_TRST_PULLS_SRST is a board or chip level quirk, which
 632          * can kick in even if the JTAG adapter can't drive SRST.
 633          */
 634         if (req_tlr_or_trst) {
 635                 if (!(jtag_reset_config & RESET_HAS_TRST))
 636                         trst_with_tlr = 1;
 637                 else if ((jtag_reset_config & RESET_TRST_PULLS_SRST) != 0
 638                                 && !req_srst)
 639                         trst_with_tlr = 1;
 640                 else
 641                         new_trst = 1;
 642         }
 643
 644         /* Maybe change TRST and/or SRST signal state */
 645         if (jtag_srst != new_srst || jtag_trst != new_trst) {
 646                 int retval;
 647
 648                 retval = interface_jtag_add_reset(new_trst, new_srst);
 649                 if (retval != ERROR_OK)
 650                         jtag_set_error(retval);
 651                 else
 652                         retval = jtag_execute_queue();
 653
 654                 if (retval != ERROR_OK) {
 655                         LOG_ERROR("TRST/SRST error %d", retval);
 656                         return;
 657                 }
 658         }
 659
 660         /* SRST resets everything hooked up to that signal */
 661         if (jtag_srst != new_srst) {
 662                 jtag_srst = new_srst;
 663                 if (jtag_srst)
 664                         LOG_DEBUG("SRST line asserted");
 665                 else {
 666                         LOG_DEBUG("SRST line released");
 667                         if (jtag_nsrst_delay)
 668                                 jtag_add_sleep(jtag_nsrst_delay * 1000);
 669                 }
 670         }
 671
 672         /* Maybe enter the JTAG TAP_RESET state ...
 673          *  - using only TMS, TCK, and the JTAG state machine
 674          *  - or else more directly, using TRST
 675          *
 676          * TAP_RESET should be invisible to non-debug parts of the system.
 677          */
 678         if (trst_with_tlr) {
 679                 LOG_DEBUG("JTAG reset with TLR instead of TRST");
 680                 jtag_set_end_state(TAP_RESET);
 681                 jtag_add_tlr();
 682
 683         } else if (jtag_trst != new_trst) {
 684                 jtag_trst = new_trst;
 685                 if (jtag_trst) {
 686                         /* we just asserted nTRST, so we're now in TAP_RESET;
 687                          * inform possible listeners about this
 688                          *
 689                          * REVISIT asserting TRST is less significant than
 690                          * being in TAP_RESET ... both entries (TRST, TLR)
 691                          * should trigger a callback.
 692                          */
 693                         LOG_DEBUG("TRST line asserted");
 694                         tap_set_state(TAP_RESET);
 695                         jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
 696                 } else {
 697                         LOG_DEBUG("TRST line released");
 698                         if (jtag_ntrst_delay)
 699                                 jtag_add_sleep(jtag_ntrst_delay * 1000);
 700
 701                         jtag_notify_reset();
 702                 }
 703         }
 704 }
 705
 706 tap_state_t jtag_set_end_state(tap_state_t state)
 707 {
 708         if ((state == TAP_DRSHIFT)||(state == TAP_IRSHIFT))
 709         {
 710                 LOG_ERROR("BUG: TAP_DRSHIFT/IRSHIFT can't be end state. Calling code should use a larger scan field");
 711         }
 712
 713         if (state != TAP_INVALID)
 714                 cmd_queue_end_state = state;
 715         return cmd_queue_end_state;
 716 }
 717
 718 tap_state_t jtag_get_end_state(void)
 719 {
 720         return cmd_queue_end_state;
 721 }
 722
 723 void jtag_add_sleep(uint32_t us)
 724 {
 725         /// @todo Here, keep_alive() appears to be a layering violation!!!
 726         keep_alive();
 727         jtag_set_error(interface_jtag_add_sleep(us));
 728 }
 729
 730 int jtag_check_value_inner(uint8_t *captured, uint8_t *in_check_value, uint8_t *in_check_mask, int num_bits)
 731 {
 732         int retval = ERROR_OK;
 733
 734         int compare_failed = 0;
 735
 736         if (in_check_mask)
 737                 compare_failed = buf_cmp_mask(captured, in_check_value, in_check_mask, num_bits);
 738         else
 739                 compare_failed = buf_cmp(captured, in_check_value, num_bits);
 740
 741         if (compare_failed) {
 742                 /* An error handler could have caught the failing check
 743                  * only report a problem when there wasn't a handler, or if the handler
 744                  * acknowledged the error
 745                  */
 746                 /*
 747                 LOG_WARNING("TAP %s:",
 748                                         jtag_tap_name(field->tap));
 749                                         */
 750                 if (compare_failed)
 751                 {
 752                         char *captured_char = buf_to_str(captured, (num_bits > DEBUG_JTAG_IOZ) ? DEBUG_JTAG_IOZ : num_bits, 16);
 753                         char *in_check_value_char = buf_to_str(in_check_value, (num_bits > DEBUG_JTAG_IOZ) ? DEBUG_JTAG_IOZ : num_bits, 16);
 754
 755                         if (in_check_mask)
 756                         {
 757                                 char *in_check_mask_char;
 758                                 in_check_mask_char = buf_to_str(in_check_mask, (num_bits > DEBUG_JTAG_IOZ) ? DEBUG_JTAG_IOZ : num_bits, 16);
 759                                 LOG_WARNING("value captured during scan didn't pass the requested check:");
 760                                 LOG_WARNING("captured: 0x%s check_value: 0x%s check_mask: 0x%s",
 761                                                         captured_char, in_check_value_char, in_check_mask_char);
 762                                 free(in_check_mask_char);
 763                         }
 764                         else
 765                         {
 766                                 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);
 767                         }
 768
 769                         free(captured_char);
 770                         free(in_check_value_char);
 771
 772                         retval = ERROR_JTAG_QUEUE_FAILED;
 773                 }
 774
 775         }
 776         return retval;
 777 }
 778
 779 void jtag_check_value_mask(scan_field_t *field, uint8_t *value, uint8_t *mask)
 780 {
 781         assert(field->in_value != NULL);
 782
 783         if (value == NULL)
 784         {
 785                 /* no checking to do */
 786                 return;
 787         }
 788
 789         jtag_execute_queue_noclear();
 790
 791         int retval = jtag_check_value_inner(field->in_value, value, mask, field->num_bits);
 792         jtag_set_error(retval);
 793 }
 794
 795
 796
 797 int default_interface_jtag_execute_queue(void)
 798 {
 799         if (NULL == jtag)
 800         {
 801                 LOG_ERROR("No JTAG interface configured yet.  "
 802                         "Issue 'init' command in startup scripts "
 803                         "before communicating with targets.");
 804                 return ERROR_FAIL;
 805         }
 806
 807         return jtag->execute_queue();
 808 }
 809
 810 void jtag_execute_queue_noclear(void)
 811 {
 812         jtag_flush_queue_count++;
 813         jtag_set_error(interface_jtag_execute_queue());
 814 }
 815
 816 int jtag_get_flush_queue_count(void)
 817 {
 818         return jtag_flush_queue_count;
 819 }
 820
 821 int jtag_execute_queue(void)
 822 {
 823         jtag_execute_queue_noclear();
 824         return jtag_error_clear();
 825 }
 826
 827 static int jtag_reset_callback(enum jtag_event event, void *priv)
 828 {
 829         jtag_tap_t *tap = priv;
 830
 831         LOG_DEBUG("-");
 832
 833         if (event == JTAG_TRST_ASSERTED)
 834         {
 835                 tap->enabled = !tap->disabled_after_reset;
 836
 837                 /* current instruction is either BYPASS or IDCODE */
 838                 buf_set_ones(tap->cur_instr, tap->ir_length);
 839                 tap->bypass = 1;
 840         }
 841
 842         return ERROR_OK;
 843 }
 844
 845 void jtag_sleep(uint32_t us)
 846 {
 847         alive_sleep(us/1000);
 848 }
 849
 850 /// maximum number of JTAG devices expected in the chain
 851 #define JTAG_MAX_CHAIN_SIZE 20
 852
 853 #define EXTRACT_MFG(X)  (((X) & 0xffe) >> 1)
 854 #define EXTRACT_PART(X) (((X) & 0xffff000) >> 12)
 855 #define EXTRACT_VER(X)  (((X) & 0xf0000000) >> 28)
 856
 857 static int jtag_examine_chain_execute(uint8_t *idcode_buffer, unsigned num_idcode)
 858 {
 859         scan_field_t field = {
 860                         .tap = NULL,
 861                         .num_bits = num_idcode * 32,
 862                         .out_value = idcode_buffer,
 863                         .in_value = idcode_buffer,
 864                 };
 865
 866         // initialize to the end of chain ID value
 867         for (unsigned i = 0; i < JTAG_MAX_CHAIN_SIZE; i++)
 868                 buf_set_u32(idcode_buffer, i * 32, 32, 0x000000FF);
 869
 870         jtag_add_plain_dr_scan(1, &field, TAP_DRPAUSE);
 871         jtag_add_tlr();
 872         return jtag_execute_queue();
 873 }
 874
 875 static bool jtag_examine_chain_check(uint8_t *idcodes, unsigned count)
 876 {
 877         uint8_t zero_check = 0x0;
 878         uint8_t one_check = 0xff;
 879
 880         for (unsigned i = 0; i < count * 4; i++)
 881         {
 882                 zero_check |= idcodes[i];
 883                 one_check &= idcodes[i];
 884         }
 885
 886         /* if there wasn't a single non-zero bit or if all bits were one,
 887          * the scan is not valid */
 888         if (zero_check == 0x00 || one_check == 0xff)
 889         {
 890                 LOG_ERROR("JTAG communication failure: check connection, "
 891                         "JTAG interface, target power etc.");
 892                 return false;
 893         }
 894         return true;
 895 }
 896
 897 static void jtag_examine_chain_display(enum log_levels level, const char *msg,
 898                 const char *name, uint32_t idcode)
 899 {
 900         log_printf_lf(level, __FILE__, __LINE__, __FUNCTION__,
 901                                   "JTAG tap: %s %16.16s: 0x%08x "
 902                                   "(mfg: 0x%3.3x, part: 0x%4.4x, ver: 0x%1.1x)",
 903                                   name, msg,
 904                                   (unsigned int)idcode,
 905                                   (unsigned int)EXTRACT_MFG(idcode),
 906                                   (unsigned int)EXTRACT_PART(idcode),
 907                                   (unsigned int)EXTRACT_VER(idcode));
 908 }
 909
 910 static bool jtag_idcode_is_final(uint32_t idcode)
 911 {
 912                 return idcode == 0x000000FF || idcode == 0xFFFFFFFF;
 913 }
 914
 915 /**
 916  * This helper checks that remaining bits in the examined chain data are
 917  * all as expected, but a single JTAG device requires only 64 bits to be
 918  * read back correctly.  This can help identify and diagnose problems
 919  * with the JTAG chain earlier, gives more helpful/explicit error messages.
 920  */
 921 static void jtag_examine_chain_end(uint8_t *idcodes, unsigned count, unsigned max)
 922 {
 923         bool triggered = false;
 924         for (; count < max - 31; count += 32)
 925         {
 926                 uint32_t idcode = buf_get_u32(idcodes, count, 32);
 927                 // do not trigger the warning if the data looks good
 928                 if (!triggered && jtag_idcode_is_final(idcode))
 929                         continue;
 930                 LOG_WARNING("Unexpected idcode after end of chain: %d 0x%08x",
 931                                         count, (unsigned int)idcode);
 932                 triggered = true;
 933         }
 934 }
 935
 936 static bool jtag_examine_chain_match_tap(const struct jtag_tap_s *tap)
 937 {
 938         if (0 == tap->expected_ids_cnt)
 939         {
 940                 /// @todo Enable LOG_INFO to ask for reports about unknown TAP IDs.
 941 #if 0
 942                 LOG_INFO("Uknown JTAG TAP ID: 0x%08x", tap->idcode)
 943                 LOG_INFO("Please report the chip name and reported ID code to the openocd project");
 944 #endif
 945                 return true;
 946         }
 947
 948         /* Loop over the expected identification codes and test for a match */
 949         uint8_t ii;
 950         for (ii = 0; ii < tap->expected_ids_cnt; ii++)
 951         {
 952                 if (tap->idcode == tap->expected_ids[ii])
 953                         break;
 954         }
 955
 956         /* If none of the expected ids matched, log an error */
 957         if (ii != tap->expected_ids_cnt)
 958         {
 959                 LOG_DEBUG("JTAG Tap/device matched");
 960                 return true;
 961         }
 962         jtag_examine_chain_display(LOG_LVL_ERROR, "got",
 963                         tap->dotted_name, tap->idcode);
 964         for (ii = 0; ii < tap->expected_ids_cnt; ii++)
 965         {
 966                 char msg[32];
 967                 snprintf(msg, sizeof(msg), "expected %hhu of %hhu",
 968                                 ii + 1, tap->expected_ids_cnt);
 969                 jtag_examine_chain_display(LOG_LVL_ERROR, msg,
 970                                 tap->dotted_name, tap->expected_ids[ii]);
 971         }
 972         return false;
 973 }
 974
 975 /* Try to examine chain layout according to IEEE 1149.1 §12
 976  */
 977 int jtag_examine_chain(void)
 978 {
 979         uint8_t idcode_buffer[JTAG_MAX_CHAIN_SIZE * 4];
 980         unsigned device_count = 0;
 981
 982         jtag_examine_chain_execute(idcode_buffer, JTAG_MAX_CHAIN_SIZE);
 983
 984         if (!jtag_examine_chain_check(idcode_buffer, JTAG_MAX_CHAIN_SIZE))
 985                 return ERROR_JTAG_INIT_FAILED;
 986
 987         /* point at the 1st tap */
 988         jtag_tap_t *tap = jtag_tap_next_enabled(NULL);
 989         if (tap == NULL)
 990         {
 991                 LOG_ERROR("JTAG: No taps enabled?");
 992                 return ERROR_JTAG_INIT_FAILED;
 993         }
 994
 995         for (unsigned bit_count = 0;
 996                         tap && bit_count < (JTAG_MAX_CHAIN_SIZE * 32) - 31;
 997                         tap = jtag_tap_next_enabled(tap))
 998         {
 999                 uint32_t idcode = buf_get_u32(idcode_buffer, bit_count, 32);
1000
1001                 if ((idcode & 1) == 0)
1002                 {
1003                         /* LSB must not be 0, this indicates a device in bypass */
1004                         LOG_WARNING("Tap/Device does not have IDCODE");
1005                         idcode = 0;
1006                         tap->hasidcode = false;
1007
1008                         bit_count += 1;
1009                 }
1010                 else
1011                 {
1012                         tap->hasidcode = true;
1013
1014                         /*
1015                          * End of chain (invalid manufacturer ID) some devices, such
1016                          * as AVR will output all 1's instead of TDI input value at
1017                          * end of chain.
1018                          */
1019                         if (jtag_idcode_is_final(idcode))
1020                         {
1021                                 jtag_examine_chain_end(idcode_buffer,
1022                                                 bit_count + 32, JTAG_MAX_CHAIN_SIZE * 32);
1023                                 break;
1024                         }
1025
1026                         jtag_examine_chain_display(LOG_LVL_INFO, "tap/device found",
1027                                         tap ? tap->dotted_name : "(not-named)",
1028                                         idcode);
1029
1030                         bit_count += 32;
1031                 }
1032                 device_count++;
1033                 if (!tap)
1034                         continue;
1035
1036                 tap->idcode = idcode;
1037
1038                 // ensure the TAP ID does matches what was expected
1039                 if (!jtag_examine_chain_match_tap(tap))
1040                         return ERROR_JTAG_INIT_FAILED;
1041         }
1042
1043         /* see if number of discovered devices matches configuration */
1044         if (device_count != jtag_tap_count_enabled())
1045         {
1046                 LOG_ERROR("number of discovered devices in JTAG chain (%i) "
1047                                 "does not match (enabled) configuration (%i), total taps: %d",
1048                                 device_count, jtag_tap_count_enabled(), jtag_tap_count());
1049                 LOG_ERROR("check the config file and ensure proper JTAG communication"
1050                                 " (connections, speed, ...)");
1051                 return ERROR_JTAG_INIT_FAILED;
1052         }
1053
1054         return ERROR_OK;
1055 }
1056
1057 int jtag_validate_chain(void)
1058 {
1059         jtag_tap_t *tap;
1060         int total_ir_length = 0;
1061         uint8_t *ir_test = NULL;
1062         scan_field_t field;
1063         int chain_pos = 0;
1064
1065         tap = NULL;
1066         total_ir_length = 0;
1067         for (;;) {
1068                 tap = jtag_tap_next_enabled(tap);
1069                 if (tap == NULL) {
1070                         break;
1071                 }
1072                 total_ir_length += tap->ir_length;
1073         }
1074
1075         total_ir_length += 2;
1076         ir_test = malloc(CEIL(total_ir_length, 8));
1077         buf_set_ones(ir_test, total_ir_length);
1078
1079         field.tap = NULL;
1080         field.num_bits = total_ir_length;
1081         field.out_value = ir_test;
1082         field.in_value = ir_test;
1083
1084
1085         jtag_add_plain_ir_scan(1, &field, TAP_IRPAUSE);
1086         jtag_add_tlr();
1087
1088         int retval;
1089         retval = jtag_execute_queue();
1090         if (retval != ERROR_OK)
1091                 return retval;
1092
1093         tap = NULL;
1094         chain_pos = 0;
1095         int val;
1096         for (;;) {
1097                 tap = jtag_tap_next_enabled(tap);
1098                 if (tap == NULL) {
1099                         break;
1100                 }
1101
1102                 val = buf_get_u32(ir_test, chain_pos, 2);
1103                 /* Only fail this check if we have IDCODE for this device */
1104                 if ((val != 0x1)&&(tap->hasidcode))
1105                 {
1106                         char *cbuf = buf_to_str(ir_test, total_ir_length, 16);
1107                         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);
1108                         free(cbuf);
1109                         free(ir_test);
1110                         return ERROR_JTAG_INIT_FAILED;
1111                 }
1112                 chain_pos += tap->ir_length;
1113         }
1114
1115         val = buf_get_u32(ir_test, chain_pos, 2);
1116         if (val != 0x3)
1117         {
1118                 char *cbuf = buf_to_str(ir_test, total_ir_length, 16);
1119                 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);
1120                 free(cbuf);
1121                 free(ir_test);
1122                 return ERROR_JTAG_INIT_FAILED;
1123         }
1124
1125         free(ir_test);
1126
1127         return ERROR_OK;
1128 }
1129
1130
1131 void jtag_tap_init(jtag_tap_t *tap)
1132 {
1133         assert(0 != tap->ir_length);
1134
1135         tap->expected = malloc(tap->ir_length);
1136         tap->expected_mask = malloc(tap->ir_length);
1137         tap->cur_instr = malloc(tap->ir_length);
1138
1139         /// @todo cope sanely with ir_length bigger than 32 bits
1140         buf_set_u32(tap->expected, 0, tap->ir_length, tap->ir_capture_value);
1141         buf_set_u32(tap->expected_mask, 0, tap->ir_length, tap->ir_capture_mask);
1142         buf_set_ones(tap->cur_instr, tap->ir_length);
1143
1144         // place TAP in bypass mode
1145         tap->bypass = 1;
1146         // register the reset callback for the TAP
1147         jtag_register_event_callback(&jtag_reset_callback, tap);
1148
1149         LOG_DEBUG("Created Tap: %s @ abs position %d, "
1150                         "irlen %d, capture: 0x%x mask: 0x%x", tap->dotted_name,
1151                                 tap->abs_chain_position, tap->ir_length,
1152                           (unsigned int)(tap->ir_capture_value), (unsigned int)(tap->ir_capture_mask));
1153         jtag_tap_add(tap);
1154 }
1155
1156 void jtag_tap_free(jtag_tap_t *tap)
1157 {
1158         jtag_unregister_event_callback(&jtag_reset_callback, tap);
1159
1160         /// @todo is anything missing? no memory leaks please
1161         free((void *)tap->expected_ids);
1162         free((void *)tap->chip);
1163         free((void *)tap->tapname);
1164         free((void *)tap->dotted_name);
1165         free(tap);
1166 }
1167
1168 int jtag_interface_init(struct command_context_s *cmd_ctx)
1169 {
1170         if (jtag)
1171                 return ERROR_OK;
1172
1173         if (!jtag_interface)
1174         {
1175                 /* nothing was previously specified by "interface" command */
1176                 LOG_ERROR("JTAG interface has to be specified, see \"interface\" command");
1177                 return ERROR_JTAG_INVALID_INTERFACE;
1178         }
1179
1180         jtag = jtag_interface;
1181         if (jtag_interface->init() != ERROR_OK)
1182         {
1183                 jtag = NULL;
1184                 return ERROR_JTAG_INIT_FAILED;
1185         }
1186
1187         int requested_khz = jtag_get_speed_khz();
1188         int actual_khz = requested_khz;
1189         int retval = jtag_get_speed_readable(&actual_khz);
1190         if (ERROR_OK != retval)
1191                 LOG_INFO("interface specific clock speed value %d", jtag_get_speed());
1192         else if (actual_khz)
1193         {
1194                 if ((CLOCK_MODE_RCLK == clock_mode)
1195                         || ((CLOCK_MODE_KHZ == clock_mode) && !requested_khz))
1196                 {
1197                         LOG_INFO("RCLK (adaptive clock speed) not supported - fallback to %d kHz"
1198                                 , actual_khz);
1199                 }
1200                 else
1201                         LOG_INFO("clock speed %d kHz", actual_khz);
1202         }
1203         else
1204                 LOG_INFO("RCLK (adaptive clock speed)");
1205
1206         return ERROR_OK;
1207 }
1208
1209 static int jtag_init_inner(struct command_context_s *cmd_ctx)
1210 {
1211         jtag_tap_t *tap;
1212         int retval;
1213
1214         LOG_DEBUG("Init JTAG chain");
1215
1216         tap = jtag_tap_next_enabled(NULL);
1217         if (tap == NULL) {
1218                 LOG_ERROR("There are no enabled taps?");
1219                 return ERROR_JTAG_INIT_FAILED;
1220         }
1221
1222         jtag_add_tlr();
1223         if ((retval = jtag_execute_queue()) != ERROR_OK)
1224                 return retval;
1225
1226         /* examine chain first, as this could discover the real chain layout */
1227         if (jtag_examine_chain() != ERROR_OK)
1228         {
1229                 LOG_ERROR("trying to validate configured JTAG chain anyway...");
1230         }
1231
1232         if (jtag_validate_chain() != ERROR_OK)
1233         {
1234                 LOG_WARNING("Could not validate JTAG chain, continuing anyway...");
1235         }
1236
1237         return ERROR_OK;
1238 }
1239
1240 int jtag_interface_quit(void)
1241 {
1242         if (!jtag || !jtag->quit)
1243                 return ERROR_OK;
1244
1245         // close the JTAG interface
1246         int result = jtag->quit();
1247         if (ERROR_OK != result)
1248                 LOG_ERROR("failed: %d", result);
1249
1250         return ERROR_OK;
1251 }
1252
1253
1254 int jtag_init_reset(struct command_context_s *cmd_ctx)
1255 {
1256         int retval;
1257
1258         if ((retval = jtag_interface_init(cmd_ctx)) != ERROR_OK)
1259                 return retval;
1260
1261         LOG_DEBUG("Trying to bring the JTAG controller to life by asserting TRST / TLR");
1262
1263         /* Reset can happen after a power cycle.
1264          *
1265          * Ideally we would only assert TRST or run TLR before the target reset.
1266          *
1267          * However w/srst_pulls_trst, trst is asserted together with the target
1268          * reset whether we want it or not.
1269          *
1270          * NB! Some targets have JTAG circuitry disabled until a
1271          * trst & srst has been asserted.
1272          *
1273          * NB! here we assume nsrst/ntrst delay are sufficient!
1274          *
1275          * NB! order matters!!!! srst *can* disconnect JTAG circuitry
1276          *
1277          */
1278         jtag_add_reset(1, 0); /* TAP_RESET, using TMS+TCK or TRST */
1279         if (jtag_reset_config & RESET_HAS_SRST)
1280         {
1281                 jtag_add_reset(1, 1);
1282                 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) == 0)
1283                         jtag_add_reset(0, 1);
1284         }
1285         jtag_add_reset(0, 0);
1286         if ((retval = jtag_execute_queue()) != ERROR_OK)
1287                 return retval;
1288
1289         /* Check that we can communication on the JTAG chain + eventually we want to
1290          * be able to perform enumeration only after OpenOCD has started
1291          * telnet and GDB server
1292          *
1293          * That would allow users to more easily perform any magic they need to before
1294          * reset happens.
1295          */
1296         return jtag_init_inner(cmd_ctx);
1297 }
1298
1299 int jtag_init(struct command_context_s *cmd_ctx)
1300 {
1301         int retval;
1302         if ((retval = jtag_interface_init(cmd_ctx)) != ERROR_OK)
1303                 return retval;
1304         if (jtag_init_inner(cmd_ctx) == ERROR_OK)
1305         {
1306                 return ERROR_OK;
1307         }
1308         return jtag_init_reset(cmd_ctx);
1309 }
1310
1311 unsigned jtag_get_speed_khz(void)
1312 {
1313         return speed_khz;
1314 }
1315
1316 static int jtag_khz_to_speed(unsigned khz, int* speed)
1317 {
1318         LOG_DEBUG("convert khz to interface specific speed value");
1319         speed_khz = khz;
1320         if (jtag != NULL)
1321         {
1322                 LOG_DEBUG("have interface set up");
1323                 int speed_div1;
1324                 int retval = jtag->khz(jtag_get_speed_khz(), &speed_div1);
1325                 if (ERROR_OK != retval)
1326                 {
1327                         return retval;
1328                 }
1329                 *speed = speed_div1;
1330         }
1331         return ERROR_OK;
1332 }
1333
1334 static int jtag_rclk_to_speed(unsigned fallback_speed_khz, int* speed)
1335 {
1336         int retval = jtag_khz_to_speed(0, speed);
1337         if ((ERROR_OK != retval) && fallback_speed_khz)
1338         {
1339                 LOG_DEBUG("trying fallback speed...");
1340                 retval = jtag_khz_to_speed(fallback_speed_khz, speed);
1341         }
1342         return retval;
1343 }
1344
1345 static int jtag_set_speed(int speed)
1346 {
1347         jtag_speed = speed;
1348         /* this command can be called during CONFIG,
1349          * in which case jtag isn't initialized */
1350         return jtag ? jtag->speed(speed) : ERROR_OK;
1351 }
1352
1353 int jtag_config_speed(int speed)
1354 {
1355         LOG_DEBUG("handle jtag speed");
1356         clock_mode = CLOCK_MODE_SPEED;
1357         return jtag_set_speed(speed);
1358 }
1359
1360 int jtag_config_khz(unsigned khz)
1361 {
1362         LOG_DEBUG("handle jtag khz");
1363         clock_mode = CLOCK_MODE_KHZ;
1364         int speed = 0;
1365         int retval = jtag_khz_to_speed(khz, &speed);
1366         return (ERROR_OK != retval) ? retval : jtag_set_speed(speed);
1367 }
1368
1369 int jtag_config_rclk(unsigned fallback_speed_khz)
1370 {
1371         LOG_DEBUG("handle jtag rclk");
1372         clock_mode = CLOCK_MODE_RCLK;
1373         rclk_fallback_speed_khz = fallback_speed_khz;
1374         int speed = 0;
1375         int retval = jtag_rclk_to_speed(fallback_speed_khz, &speed);
1376         return (ERROR_OK != retval) ? retval : jtag_set_speed(speed);
1377 }
1378
1379 int jtag_get_speed(void)
1380 {
1381         int speed;
1382         switch(clock_mode)
1383         {
1384                 case CLOCK_MODE_SPEED:
1385                         speed = jtag_speed;
1386                         break;
1387                 case CLOCK_MODE_KHZ:
1388                         jtag_khz_to_speed(jtag_get_speed_khz(), &speed);
1389                         break;
1390                 case CLOCK_MODE_RCLK:
1391                         jtag_rclk_to_speed(rclk_fallback_speed_khz, &speed);
1392                         break;
1393                 default:
1394                         LOG_ERROR("BUG: unknown jtag clock mode");
1395                         speed = 0;
1396                         break;
1397         }
1398         return speed;
1399 }
1400
1401 int jtag_get_speed_readable(int *khz)
1402 {
1403         return jtag ? jtag->speed_div(jtag_get_speed(), khz) : ERROR_OK;
1404 }
1405
1406 void jtag_set_verify(bool enable)
1407 {
1408         jtag_verify = enable;
1409 }
1410
1411 bool jtag_will_verify()
1412 {
1413         return jtag_verify;
1414 }
1415
1416 void jtag_set_verify_capture_ir(bool enable)
1417 {
1418         jtag_verify_capture_ir = enable;
1419 }
1420
1421 bool jtag_will_verify_capture_ir()
1422 {
1423         return jtag_verify_capture_ir;
1424 }
1425
1426 int jtag_power_dropout(int *dropout)
1427 {
1428         return jtag->power_dropout(dropout);
1429 }
1430
1431 int jtag_srst_asserted(int *srst_asserted)
1432 {
1433         return jtag->srst_asserted(srst_asserted);
1434 }
1435
1436 enum reset_types jtag_get_reset_config(void)
1437 {
1438         return jtag_reset_config;
1439 }
1440 void jtag_set_reset_config(enum reset_types type)
1441 {
1442         jtag_reset_config = type;
1443 }
1444
1445 int jtag_get_trst(void)
1446 {
1447         return jtag_trst;
1448 }
1449 int jtag_get_srst(void)
1450 {
1451         return jtag_srst;
1452 }
1453
1454 void jtag_set_nsrst_delay(unsigned delay)
1455 {
1456         jtag_nsrst_delay = delay;
1457 }
1458 unsigned jtag_get_nsrst_delay(void)
1459 {
1460         return jtag_nsrst_delay;
1461 }
1462 void jtag_set_ntrst_delay(unsigned delay)
1463 {
1464         jtag_ntrst_delay = delay;
1465 }
1466 unsigned jtag_get_ntrst_delay(void)
1467 {
1468         return jtag_ntrst_delay;
1469 }