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] = "TAP reset",
  64         [JTAG_TAP_EVENT_SETUP] = "TAP setup",
  65         [JTAG_TAP_EVENT_ENABLE] = "TAP enabled",
  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 static int jtag_nsrst_assert_width = 0; /* width of assertion */
  97 static int jtag_ntrst_assert_width = 0; /* width of assertion */
  98
  99 typedef struct jtag_event_callback_s
 100 {
 101         jtag_event_handler_t          callback;
 102         void*                         priv;
 103         struct jtag_event_callback_s* next;
 104 } jtag_event_callback_t;
 105
 106 /* callbacks to inform high-level handlers about JTAG state changes */
 107 static jtag_event_callback_t *jtag_event_callbacks;
 108
 109 /* speed in kHz*/
 110 static int speed_khz = 0;
 111 /* speed to fallback to when RCLK is requested but not supported */
 112 static int rclk_fallback_speed_khz = 0;
 113 static enum {CLOCK_MODE_SPEED, CLOCK_MODE_KHZ, CLOCK_MODE_RCLK} clock_mode;
 114 static int jtag_speed = 0;
 115
 116 static struct jtag_interface_s *jtag = NULL;
 117
 118 /* configuration */
 119 jtag_interface_t *jtag_interface = NULL;
 120
 121 void jtag_set_error(int error)
 122 {
 123         if ((error == ERROR_OK) || (jtag_error != ERROR_OK))
 124                 return;
 125         jtag_error = error;
 126 }
 127 int jtag_get_error(void)
 128 {
 129         return jtag_error;
 130 }
 131 int jtag_error_clear(void)
 132 {
 133         int temp = jtag_error;
 134         jtag_error = ERROR_OK;
 135         return temp;
 136 }
 137
 138
 139 jtag_tap_t *jtag_all_taps(void)
 140 {
 141         return __jtag_all_taps;
 142 };
 143
 144 unsigned jtag_tap_count(void)
 145 {
 146         return jtag_num_taps;
 147 }
 148
 149 unsigned jtag_tap_count_enabled(void)
 150 {
 151         jtag_tap_t *t = jtag_all_taps();
 152         unsigned n = 0;
 153         while (t)
 154         {
 155                 if (t->enabled)
 156                         n++;
 157                 t = t->next_tap;
 158         }
 159         return n;
 160 }
 161
 162 /// Append a new TAP to the chain of all taps.
 163 void jtag_tap_add(struct jtag_tap_s *t)
 164 {
 165         t->abs_chain_position = jtag_num_taps++;
 166
 167         jtag_tap_t **tap = &__jtag_all_taps;
 168         while (*tap != NULL)
 169                 tap = &(*tap)->next_tap;
 170         *tap = t;
 171 }
 172
 173 /* returns a pointer to the n-th device in the scan chain */
 174 static inline jtag_tap_t *jtag_tap_by_position(unsigned n)
 175 {
 176         jtag_tap_t *t = jtag_all_taps();
 177
 178         while (t && n-- > 0)
 179                 t = t->next_tap;
 180
 181         return t;
 182 }
 183
 184 jtag_tap_t *jtag_tap_by_string(const char *s)
 185 {
 186         /* try by name first */
 187         jtag_tap_t *t = jtag_all_taps();
 188
 189         while (t)
 190         {
 191                 if (0 == strcmp(t->dotted_name, s))
 192                         return t;
 193                 t = t->next_tap;
 194         }
 195
 196         /* no tap found by name, so try to parse the name as a number */
 197         unsigned n;
 198         if (parse_uint(s, &n) != ERROR_OK)
 199                 return NULL;
 200
 201         /* FIXME remove this numeric fallback code late June 2010, along
 202          * with all info in the User's Guide that TAPs have numeric IDs.
 203          * Also update "scan_chain" output to not display the numbers.
 204          */
 205         t = jtag_tap_by_position(n);
 206         if (t)
 207                 LOG_WARNING("Specify TAP '%s' by name, not number %u",
 208                         t->dotted_name, n);
 209
 210         return t;
 211 }
 212
 213 jtag_tap_t *jtag_tap_by_jim_obj(Jim_Interp *interp, Jim_Obj *o)
 214 {
 215         const char *cp = Jim_GetString(o, NULL);
 216         jtag_tap_t *t = cp ? jtag_tap_by_string(cp) : NULL;
 217         if (NULL == cp)
 218                 cp = "(unknown)";
 219         if (NULL == t)
 220                 Jim_SetResult_sprintf(interp, "Tap '%s' could not be found", cp);
 221         return t;
 222 }
 223
 224 jtag_tap_t* jtag_tap_next_enabled(jtag_tap_t* p)
 225 {
 226         p = p ? p->next_tap : jtag_all_taps();
 227         while (p)
 228         {
 229                 if (p->enabled)
 230                         return p;
 231                 p = p->next_tap;
 232         }
 233         return NULL;
 234 }
 235
 236 const char *jtag_tap_name(const jtag_tap_t *tap)
 237 {
 238         return (tap == NULL) ? "(unknown)" : tap->dotted_name;
 239 }
 240
 241
 242 int jtag_register_event_callback(jtag_event_handler_t callback, void *priv)
 243 {
 244         jtag_event_callback_t **callbacks_p = &jtag_event_callbacks;
 245
 246         if (callback == NULL)
 247         {
 248                 return ERROR_INVALID_ARGUMENTS;
 249         }
 250
 251         if (*callbacks_p)
 252         {
 253                 while ((*callbacks_p)->next)
 254                         callbacks_p = &((*callbacks_p)->next);
 255                 callbacks_p = &((*callbacks_p)->next);
 256         }
 257
 258         (*callbacks_p) = malloc(sizeof(jtag_event_callback_t));
 259         (*callbacks_p)->callback = callback;
 260         (*callbacks_p)->priv = priv;
 261         (*callbacks_p)->next = NULL;
 262
 263         return ERROR_OK;
 264 }
 265
 266 int jtag_unregister_event_callback(jtag_event_handler_t callback, void *priv)
 267 {
 268         jtag_event_callback_t **callbacks_p;
 269         jtag_event_callback_t **next;
 270
 271         if (callback == NULL)
 272         {
 273                 return ERROR_INVALID_ARGUMENTS;
 274         }
 275
 276         for (callbacks_p = &jtag_event_callbacks;
 277                         *callbacks_p != NULL;
 278                         callbacks_p = next)
 279         {
 280                 next = &((*callbacks_p)->next);
 281
 282                 if ((*callbacks_p)->priv != priv)
 283                         continue;
 284
 285                 if ((*callbacks_p)->callback == callback)
 286                 {
 287                         free(*callbacks_p);
 288                         *callbacks_p = *next;
 289                 }
 290         }
 291
 292         return ERROR_OK;
 293 }
 294
 295 int jtag_call_event_callbacks(enum jtag_event event)
 296 {
 297         jtag_event_callback_t *callback = jtag_event_callbacks;
 298
 299         LOG_DEBUG("jtag event: %s", jtag_event_strings[event]);
 300
 301         while (callback)
 302         {
 303                 jtag_event_callback_t *next;
 304
 305                 /* callback may remove itself */
 306                 next = callback->next;
 307                 callback->callback(event, callback->priv);
 308                 callback = next;
 309         }
 310
 311         return ERROR_OK;
 312 }
 313
 314 static void jtag_checks(void)
 315 {
 316         assert(jtag_trst == 0);
 317 }
 318
 319 static void jtag_prelude(tap_state_t state)
 320 {
 321         jtag_checks();
 322
 323         assert(state != TAP_INVALID);
 324
 325         cmd_queue_cur_state = state;
 326 }
 327
 328 void jtag_alloc_in_value32(scan_field_t *field)
 329 {
 330         interface_jtag_alloc_in_value32(field);
 331 }
 332
 333 void jtag_add_ir_scan_noverify(int in_count, const scan_field_t *in_fields,
 334                 tap_state_t state)
 335 {
 336         jtag_prelude(state);
 337
 338         int retval = interface_jtag_add_ir_scan(in_count, in_fields, state);
 339         jtag_set_error(retval);
 340 }
 341
 342
 343 void jtag_add_ir_scan(int in_num_fields, scan_field_t *in_fields, tap_state_t state)
 344 {
 345         assert(state != TAP_RESET);
 346
 347         if (jtag_verify && jtag_verify_capture_ir)
 348         {
 349                 /* 8 x 32 bit id's is enough for all invocations */
 350
 351                 for (int j = 0; j < in_num_fields; j++)
 352                 {
 353                         /* if we are to run a verification of the ir scan, we need to get the input back.
 354                          * We may have to allocate space if the caller didn't ask for the input back.
 355                          */
 356                         in_fields[j].check_value = in_fields[j].tap->expected;
 357                         in_fields[j].check_mask = in_fields[j].tap->expected_mask;
 358                 }
 359                 jtag_add_scan_check(jtag_add_ir_scan_noverify, in_num_fields, in_fields, state);
 360         } else
 361         {
 362                 jtag_add_ir_scan_noverify(in_num_fields, in_fields, state);
 363         }
 364 }
 365
 366 void jtag_add_plain_ir_scan(int in_num_fields, const scan_field_t *in_fields,
 367                 tap_state_t state)
 368 {
 369         assert(state != TAP_RESET);
 370
 371         jtag_prelude(state);
 372
 373         int retval = interface_jtag_add_plain_ir_scan(
 374                         in_num_fields, in_fields, state);
 375         jtag_set_error(retval);
 376 }
 377
 378 void jtag_add_callback(jtag_callback1_t f, jtag_callback_data_t data0)
 379 {
 380         interface_jtag_add_callback(f, data0);
 381 }
 382
 383 void jtag_add_callback4(jtag_callback_t f, jtag_callback_data_t data0,
 384                 jtag_callback_data_t data1, jtag_callback_data_t data2,
 385                 jtag_callback_data_t data3)
 386 {
 387         interface_jtag_add_callback4(f, data0, data1, data2, data3);
 388 }
 389
 390 static int jtag_check_value_inner(uint8_t *captured, uint8_t *in_check_value,
 391                 uint8_t *in_check_mask, int num_bits);
 392
 393 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)
 394 {
 395         return jtag_check_value_inner((uint8_t *)data0, (uint8_t *)data1, (uint8_t *)data2, (int)data3);
 396 }
 397
 398 static void jtag_add_scan_check(void (*jtag_add_scan)(int in_num_fields, const scan_field_t *in_fields, tap_state_t state),
 399                 int in_num_fields, scan_field_t *in_fields, tap_state_t state)
 400 {
 401         for (int i = 0; i < in_num_fields; i++)
 402         {
 403                 struct scan_field_s *field = &in_fields[i];
 404                 field->allocated = 0;
 405                 field->modified = 0;
 406                 if (field->check_value || field->in_value)
 407                         continue;
 408                 interface_jtag_add_scan_check_alloc(field);
 409                 field->modified = 1;
 410         }
 411
 412         jtag_add_scan(in_num_fields, in_fields, state);
 413
 414         for (int i = 0; i < in_num_fields; i++)
 415         {
 416                 if ((in_fields[i].check_value != NULL) && (in_fields[i].in_value != NULL))
 417                 {
 418                         /* this is synchronous for a minidriver */
 419                         jtag_add_callback4(jtag_check_value_mask_callback, (jtag_callback_data_t)in_fields[i].in_value,
 420                                 (jtag_callback_data_t)in_fields[i].check_value,
 421                                 (jtag_callback_data_t)in_fields[i].check_mask,
 422                                 (jtag_callback_data_t)in_fields[i].num_bits);
 423                 }
 424                 if (in_fields[i].allocated)
 425                 {
 426                         free(in_fields[i].in_value);
 427                 }
 428                 if (in_fields[i].modified)
 429                 {
 430                         in_fields[i].in_value = NULL;
 431                 }
 432         }
 433 }
 434
 435 void jtag_add_dr_scan_check(int in_num_fields, scan_field_t *in_fields, tap_state_t state)
 436 {
 437         if (jtag_verify)
 438         {
 439                 jtag_add_scan_check(jtag_add_dr_scan, in_num_fields, in_fields, state);
 440         } else
 441         {
 442                 jtag_add_dr_scan(in_num_fields, in_fields, state);
 443         }
 444 }
 445
 446
 447 void jtag_add_dr_scan(int in_num_fields, const scan_field_t *in_fields,
 448                 tap_state_t state)
 449 {
 450         assert(state != TAP_RESET);
 451
 452         jtag_prelude(state);
 453
 454         int retval;
 455         retval = interface_jtag_add_dr_scan(in_num_fields, in_fields, state);
 456         jtag_set_error(retval);
 457 }
 458
 459 void jtag_add_plain_dr_scan(int in_num_fields, const scan_field_t *in_fields,
 460                 tap_state_t state)
 461 {
 462         assert(state != TAP_RESET);
 463
 464         jtag_prelude(state);
 465
 466         int retval;
 467         retval = interface_jtag_add_plain_dr_scan(in_num_fields, in_fields, state);
 468         jtag_set_error(retval);
 469 }
 470
 471 void jtag_add_dr_out(jtag_tap_t* tap,
 472                 int num_fields, const int* num_bits, const uint32_t* value,
 473                 tap_state_t end_state)
 474 {
 475         assert(end_state != TAP_RESET);
 476         assert(end_state != TAP_INVALID);
 477
 478         cmd_queue_cur_state = end_state;
 479
 480         interface_jtag_add_dr_out(tap,
 481                         num_fields, num_bits, value,
 482                         end_state);
 483 }
 484
 485 void jtag_add_tlr(void)
 486 {
 487         jtag_prelude(TAP_RESET);
 488         jtag_set_error(interface_jtag_add_tlr());
 489
 490         /* NOTE: order here matches TRST path in jtag_add_reset() */
 491         jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
 492         jtag_notify_event(JTAG_TRST_ASSERTED);
 493 }
 494
 495 void jtag_add_pathmove(int num_states, const tap_state_t *path)
 496 {
 497         tap_state_t cur_state = cmd_queue_cur_state;
 498
 499         /* the last state has to be a stable state */
 500         if (!tap_is_state_stable(path[num_states - 1]))
 501         {
 502                 LOG_ERROR("BUG: TAP path doesn't finish in a stable state");
 503                 jtag_set_error(ERROR_JTAG_NOT_STABLE_STATE);
 504                 return;
 505         }
 506
 507         for (int i = 0; i < num_states; i++)
 508         {
 509                 if (path[i] == TAP_RESET)
 510                 {
 511                         LOG_ERROR("BUG: TAP_RESET is not a valid state for pathmove sequences");
 512                         jtag_set_error(ERROR_JTAG_STATE_INVALID);
 513                         return;
 514                 }
 515
 516                 if (tap_state_transition(cur_state, true)  != path[i]
 517                   && tap_state_transition(cur_state, false) != path[i])
 518                 {
 519                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 520                                         tap_state_name(cur_state), tap_state_name(path[i]));
 521                         jtag_set_error(ERROR_JTAG_TRANSITION_INVALID);
 522                         return;
 523                 }
 524                 cur_state = path[i];
 525         }
 526
 527         jtag_checks();
 528
 529         jtag_set_error(interface_jtag_add_pathmove(num_states, path));
 530         cmd_queue_cur_state = path[num_states - 1];
 531 }
 532
 533 int jtag_add_statemove(tap_state_t goal_state)
 534 {
 535         tap_state_t cur_state = cmd_queue_cur_state;
 536
 537         LOG_DEBUG("cur_state=%s goal_state=%s",
 538                 tap_state_name(cur_state),
 539                 tap_state_name(goal_state));
 540
 541
 542         if (goal_state == cur_state)
 543                 ;       /* nothing to do */
 544         else if (goal_state == TAP_RESET)
 545         {
 546                 jtag_add_tlr();
 547         }
 548         else if (tap_is_state_stable(cur_state) && tap_is_state_stable(goal_state))
 549         {
 550                 unsigned tms_bits  = tap_get_tms_path(cur_state, goal_state);
 551                 unsigned tms_count = tap_get_tms_path_len(cur_state, goal_state);
 552                 tap_state_t moves[8];
 553                 assert(tms_count < DIM(moves));
 554
 555                 for (unsigned i = 0; i < tms_count; i++, tms_bits >>= 1)
 556                 {
 557                         bool bit = tms_bits & 1;
 558
 559                         cur_state = tap_state_transition(cur_state, bit);
 560                         moves[i] = cur_state;
 561                 }
 562
 563                 jtag_add_pathmove(tms_count, moves);
 564         }
 565         else if (tap_state_transition(cur_state, true)  == goal_state
 566                 ||   tap_state_transition(cur_state, false) == goal_state)
 567         {
 568                 jtag_add_pathmove(1, &goal_state);
 569         }
 570
 571         else
 572                 return ERROR_FAIL;
 573
 574         return ERROR_OK;
 575 }
 576
 577 void jtag_add_runtest(int num_cycles, tap_state_t state)
 578 {
 579         jtag_prelude(state);
 580         jtag_set_error(interface_jtag_add_runtest(num_cycles, state));
 581 }
 582
 583
 584 void jtag_add_clocks(int num_cycles)
 585 {
 586         if (!tap_is_state_stable(cmd_queue_cur_state))
 587         {
 588                  LOG_ERROR("jtag_add_clocks() called with TAP in unstable state \"%s\"",
 589                                  tap_state_name(cmd_queue_cur_state));
 590                  jtag_set_error(ERROR_JTAG_NOT_STABLE_STATE);
 591                  return;
 592         }
 593
 594         if (num_cycles > 0)
 595         {
 596                 jtag_checks();
 597                 jtag_set_error(interface_jtag_add_clocks(num_cycles));
 598         }
 599 }
 600
 601 void jtag_add_reset(int req_tlr_or_trst, int req_srst)
 602 {
 603         int trst_with_tlr = 0;
 604         int new_srst = 0;
 605         int new_trst = 0;
 606
 607         /* Without SRST, we must use target-specific JTAG operations
 608          * on each target; callers should not be requesting SRST when
 609          * that signal doesn't exist.
 610          *
 611          * RESET_SRST_PULLS_TRST is a board or chip level quirk, which
 612          * can kick in even if the JTAG adapter can't drive TRST.
 613          */
 614         if (req_srst) {
 615                 if (!(jtag_reset_config & RESET_HAS_SRST)) {
 616                         LOG_ERROR("BUG: can't assert SRST");
 617                         jtag_set_error(ERROR_FAIL);
 618                         return;
 619                 }
 620                 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) != 0
 621                                 && !req_tlr_or_trst) {
 622                         LOG_ERROR("BUG: can't assert only SRST");
 623                         jtag_set_error(ERROR_FAIL);
 624                         return;
 625                 }
 626                 new_srst = 1;
 627         }
 628
 629         /* JTAG reset (entry to TAP_RESET state) can always be achieved
 630          * using TCK and TMS; that may go through a TAP_{IR,DR}UPDATE
 631          * state first.  TRST accelerates it, and bypasses those states.
 632          *
 633          * RESET_TRST_PULLS_SRST is a board or chip level quirk, which
 634          * can kick in even if the JTAG adapter can't drive SRST.
 635          */
 636         if (req_tlr_or_trst) {
 637                 if (!(jtag_reset_config & RESET_HAS_TRST))
 638                         trst_with_tlr = 1;
 639                 else if ((jtag_reset_config & RESET_TRST_PULLS_SRST) != 0
 640                                 && !req_srst)
 641                         trst_with_tlr = 1;
 642                 else
 643                         new_trst = 1;
 644         }
 645
 646         /* Maybe change TRST and/or SRST signal state */
 647         if (jtag_srst != new_srst || jtag_trst != new_trst) {
 648                 int retval;
 649
 650                 retval = interface_jtag_add_reset(new_trst, new_srst);
 651                 if (retval != ERROR_OK)
 652                         jtag_set_error(retval);
 653                 else
 654                         retval = jtag_execute_queue();
 655
 656                 if (retval != ERROR_OK) {
 657                         LOG_ERROR("TRST/SRST error %d", retval);
 658                         return;
 659                 }
 660         }
 661
 662         /* SRST resets everything hooked up to that signal */
 663         if (jtag_srst != new_srst) {
 664                 jtag_srst = new_srst;
 665                 if (jtag_srst)
 666                 {
 667                         LOG_DEBUG("SRST line asserted");
 668                         if (jtag_nsrst_assert_width)
 669                                 jtag_add_sleep(jtag_nsrst_assert_width * 1000);
 670                 }
 671                 else {
 672                         LOG_DEBUG("SRST line released");
 673                         if (jtag_nsrst_delay)
 674                                 jtag_add_sleep(jtag_nsrst_delay * 1000);
 675                 }
 676         }
 677
 678         /* Maybe enter the JTAG TAP_RESET state ...
 679          *  - using only TMS, TCK, and the JTAG state machine
 680          *  - or else more directly, using TRST
 681          *
 682          * TAP_RESET should be invisible to non-debug parts of the system.
 683          */
 684         if (trst_with_tlr) {
 685                 LOG_DEBUG("JTAG reset with TLR instead of TRST");
 686                 jtag_set_end_state(TAP_RESET);
 687                 jtag_add_tlr();
 688
 689         } else if (jtag_trst != new_trst) {
 690                 jtag_trst = new_trst;
 691                 if (jtag_trst) {
 692                         LOG_DEBUG("TRST line asserted");
 693                         tap_set_state(TAP_RESET);
 694                         if (jtag_ntrst_assert_width)
 695                                 jtag_add_sleep(jtag_ntrst_assert_width * 1000);
 696                 } else {
 697                         LOG_DEBUG("TRST line released");
 698                         if (jtag_ntrst_delay)
 699                                 jtag_add_sleep(jtag_ntrst_delay * 1000);
 700
 701                         /* We just asserted nTRST, so we're now in TAP_RESET.
 702                          * Inform possible listeners about this, now that
 703                          * JTAG instructions and data can be shifted.  This
 704                          * sequence must match jtag_add_tlr().
 705                          */
 706                         jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
 707                         jtag_notify_event(JTAG_TRST_ASSERTED);
 708                 }
 709         }
 710 }
 711
 712 tap_state_t jtag_set_end_state(tap_state_t state)
 713 {
 714         if ((state == TAP_DRSHIFT)||(state == TAP_IRSHIFT))
 715         {
 716                 LOG_ERROR("BUG: TAP_DRSHIFT/IRSHIFT can't be end state. Calling code should use a larger scan field");
 717         }
 718
 719         if (state != TAP_INVALID)
 720                 cmd_queue_end_state = state;
 721         return cmd_queue_end_state;
 722 }
 723
 724 tap_state_t jtag_get_end_state(void)
 725 {
 726         return cmd_queue_end_state;
 727 }
 728
 729 void jtag_add_sleep(uint32_t us)
 730 {
 731         /// @todo Here, keep_alive() appears to be a layering violation!!!
 732         keep_alive();
 733         jtag_set_error(interface_jtag_add_sleep(us));
 734 }
 735
 736 static int jtag_check_value_inner(uint8_t *captured, uint8_t *in_check_value,
 737                 uint8_t *in_check_mask, int num_bits)
 738 {
 739         int retval = ERROR_OK;
 740
 741         int compare_failed = 0;
 742
 743         if (in_check_mask)
 744                 compare_failed = buf_cmp_mask(captured, in_check_value, in_check_mask, num_bits);
 745         else
 746                 compare_failed = buf_cmp(captured, in_check_value, num_bits);
 747
 748         if (compare_failed) {
 749                 char *captured_str, *in_check_value_str;
 750                 int bits = (num_bits > DEBUG_JTAG_IOZ)
 751                                 ? DEBUG_JTAG_IOZ
 752                                 : num_bits;
 753
 754                 /* NOTE:  we've lost diagnostic context here -- 'which tap' */
 755
 756                 captured_str = buf_to_str(captured, bits, 16);
 757                 in_check_value_str = buf_to_str(in_check_value, bits, 16);
 758
 759                 LOG_WARNING("Bad value '%s' captured during DR or IR scan:",
 760                                 captured_str);
 761                 LOG_WARNING(" check_value: 0x%s", in_check_value_str);
 762
 763                 free(captured_str);
 764                 free(in_check_value_str);
 765
 766                 if (in_check_mask) {
 767                         char *in_check_mask_str;
 768
 769                         in_check_mask_str = buf_to_str(in_check_mask, bits, 16);
 770                         LOG_WARNING(" check_mask: 0x%s", in_check_mask_str);
 771                         free(in_check_mask_str);
 772                 }
 773
 774                 retval = ERROR_JTAG_QUEUE_FAILED;
 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         if (event == JTAG_TRST_ASSERTED)
 832         {
 833                 tap->enabled = !tap->disabled_after_reset;
 834
 835                 /* current instruction is either BYPASS or IDCODE */
 836                 buf_set_ones(tap->cur_instr, tap->ir_length);
 837                 tap->bypass = 1;
 838         }
 839
 840         return ERROR_OK;
 841 }
 842
 843 void jtag_sleep(uint32_t us)
 844 {
 845         alive_sleep(us/1000);
 846 }
 847
 848 /* Maximum number of enabled JTAG devices we expect in the scan chain,
 849  * plus one (to detect garbage at the end).  Devices that don't support
 850  * IDCODE take up fewer bits, possibly allowing a few more devices.
 851  */
 852 #define JTAG_MAX_CHAIN_SIZE 20
 853
 854 #define EXTRACT_MFG(X)  (((X) & 0xffe) >> 1)
 855 #define EXTRACT_PART(X) (((X) & 0xffff000) >> 12)
 856 #define EXTRACT_VER(X)  (((X) & 0xf0000000) >> 28)
 857
 858 /* A reserved manufacturer ID is used in END_OF_CHAIN_FLAG, so we
 859  * know that no valid TAP will have it as an IDCODE value.
 860  */
 861 #define END_OF_CHAIN_FLAG       0x000000ff
 862
 863 static int jtag_examine_chain_execute(uint8_t *idcode_buffer, unsigned num_idcode)
 864 {
 865         scan_field_t field = {
 866                         .tap = NULL,
 867                         .num_bits = num_idcode * 32,
 868                         .out_value = idcode_buffer,
 869                         .in_value = idcode_buffer,
 870                 };
 871
 872         // initialize to the end of chain ID value
 873         for (unsigned i = 0; i < JTAG_MAX_CHAIN_SIZE; i++)
 874                 buf_set_u32(idcode_buffer, i * 32, 32, END_OF_CHAIN_FLAG);
 875
 876         jtag_add_plain_dr_scan(1, &field, TAP_DRPAUSE);
 877         jtag_add_tlr();
 878         return jtag_execute_queue();
 879 }
 880
 881 static bool jtag_examine_chain_check(uint8_t *idcodes, unsigned count)
 882 {
 883         uint8_t zero_check = 0x0;
 884         uint8_t one_check = 0xff;
 885
 886         for (unsigned i = 0; i < count * 4; i++)
 887         {
 888                 zero_check |= idcodes[i];
 889                 one_check &= idcodes[i];
 890         }
 891
 892         /* if there wasn't a single non-zero bit or if all bits were one,
 893          * the scan is not valid */
 894         if (zero_check == 0x00 || one_check == 0xff)
 895         {
 896                 LOG_ERROR("JTAG scan chain interrogation failed: all %s",
 897                                 (zero_check == 0x00) ? "zeroes" : "ones");
 898                 LOG_ERROR("Check JTAG interface, timings, target power, etc.");
 899                 return false;
 900         }
 901         return true;
 902 }
 903
 904 static void jtag_examine_chain_display(enum log_levels level, const char *msg,
 905                 const char *name, uint32_t idcode)
 906 {
 907         log_printf_lf(level, __FILE__, __LINE__, __FUNCTION__,
 908                                   "JTAG tap: %s %16.16s: 0x%08x "
 909                                   "(mfg: 0x%3.3x, part: 0x%4.4x, ver: 0x%1.1x)",
 910                                   name, msg,
 911                                   (unsigned int)idcode,
 912                                   (unsigned int)EXTRACT_MFG(idcode),
 913                                   (unsigned int)EXTRACT_PART(idcode),
 914                                   (unsigned int)EXTRACT_VER(idcode));
 915 }
 916
 917 static bool jtag_idcode_is_final(uint32_t idcode)
 918 {
 919         /*
 920          * Some devices, such as AVR8, will output all 1's instead
 921          * of TDI input value at end of chain.  Allow those values
 922          * instead of failing.
 923          */
 924         return idcode == END_OF_CHAIN_FLAG || idcode == 0xFFFFFFFF;
 925 }
 926
 927 /**
 928  * This helper checks that remaining bits in the examined chain data are
 929  * all as expected, but a single JTAG device requires only 64 bits to be
 930  * read back correctly.  This can help identify and diagnose problems
 931  * with the JTAG chain earlier, gives more helpful/explicit error messages.
 932  * Returns TRUE iff garbage was found.
 933  */
 934 static bool jtag_examine_chain_end(uint8_t *idcodes, unsigned count, unsigned max)
 935 {
 936         bool triggered = false;
 937         for (; count < max - 31; count += 32)
 938         {
 939                 uint32_t idcode = buf_get_u32(idcodes, count, 32);
 940                 // do not trigger the warning if the data looks good
 941                 if (!triggered && jtag_idcode_is_final(idcode))
 942                         continue;
 943                 LOG_WARNING("Unexpected idcode after end of chain: %d 0x%08x",
 944                                         count, (unsigned int)idcode);
 945                 triggered = true;
 946         }
 947         return triggered;
 948 }
 949
 950 static bool jtag_examine_chain_match_tap(const struct jtag_tap_s *tap)
 951 {
 952         /* ignore expected BYPASS codes; warn otherwise */
 953         if (0 == tap->expected_ids_cnt && !tap->idcode)
 954                 return true;
 955
 956         /* Loop over the expected identification codes and test for a match */
 957         uint8_t ii;
 958         for (ii = 0; ii < tap->expected_ids_cnt; ii++)
 959         {
 960                 if (tap->idcode == tap->expected_ids[ii])
 961                         return true;
 962
 963                 /* treat "-expected-id 0" as a "don't-warn" wildcard */
 964                 if (0 == tap->expected_ids[ii])
 965                         return true;
 966         }
 967
 968         /* If none of the expected ids matched, warn */
 969         jtag_examine_chain_display(LOG_LVL_WARNING, "UNEXPECTED",
 970                         tap->dotted_name, tap->idcode);
 971         for (ii = 0; ii < tap->expected_ids_cnt; ii++)
 972         {
 973                 char msg[32];
 974                 snprintf(msg, sizeof(msg), "expected %hhu of %hhu",
 975                                 ii + 1, tap->expected_ids_cnt);
 976                 jtag_examine_chain_display(LOG_LVL_ERROR, msg,
 977                                 tap->dotted_name, tap->expected_ids[ii]);
 978         }
 979         return false;
 980 }
 981
 982 /* Try to examine chain layout according to IEEE 1149.1 §12
 983  * This is called a "blind interrogation" of the scan chain.
 984  */
 985 static int jtag_examine_chain(void)
 986 {
 987         uint8_t idcode_buffer[JTAG_MAX_CHAIN_SIZE * 4];
 988         unsigned bit_count;
 989
 990         /* DR scan to collect BYPASS or IDCODE register contents.
 991          * Then make sure the scan data has both ones and zeroes.
 992          */
 993         jtag_examine_chain_execute(idcode_buffer, JTAG_MAX_CHAIN_SIZE);
 994         if (!jtag_examine_chain_check(idcode_buffer, JTAG_MAX_CHAIN_SIZE))
 995                 return ERROR_JTAG_INIT_FAILED;
 996
 997         /* point at the 1st tap */
 998         jtag_tap_t *tap = jtag_tap_next_enabled(NULL);
 999         if (tap == NULL)
1000         {
1001                 LOG_ERROR("JTAG: No taps enabled?");
1002                 return ERROR_JTAG_INIT_FAILED;
1003         }
1004
1005         for (bit_count = 0;
1006                         tap && bit_count < (JTAG_MAX_CHAIN_SIZE * 32) - 31;
1007                         tap = jtag_tap_next_enabled(tap))
1008         {
1009                 uint32_t idcode = buf_get_u32(idcode_buffer, bit_count, 32);
1010
1011                 if ((idcode & 1) == 0)
1012                 {
1013                         /* LSB must not be 0, this indicates a device in bypass */
1014                         LOG_WARNING("TAP %s does not have IDCODE",
1015                                         tap->dotted_name);
1016                         idcode = 0;
1017                         tap->hasidcode = false;
1018
1019                         bit_count += 1;
1020                 }
1021                 else
1022                 {
1023                         /* Friendly devices support IDCODE */
1024                         tap->hasidcode = true;
1025                         jtag_examine_chain_display(LOG_LVL_INFO, "tap/device found",
1026                                         tap->dotted_name, idcode);
1027
1028                         bit_count += 32;
1029                 }
1030                 tap->idcode = idcode;
1031
1032                 /* ensure the TAP ID matches what was expected */
1033                 if (!jtag_examine_chain_match_tap(tap))
1034                         return ERROR_JTAG_INIT_FAILED;
1035         }
1036
1037         /* Fail if too many TAPs were enabled for us to verify them all. */
1038         if (tap) {
1039                 LOG_ERROR("Too many TAPs enabled; '%s' ignored.",
1040                                 tap->dotted_name);
1041                 return ERROR_JTAG_INIT_FAILED;
1042         }
1043
1044         /* After those IDCODE or BYPASS register values should be
1045          * only the data we fed into the scan chain.
1046          */
1047         if (jtag_examine_chain_end(idcode_buffer, bit_count,
1048                         8 * sizeof(idcode_buffer))) {
1049                 LOG_ERROR("double-check your JTAG setup (interface, "
1050                                 "speed, TAPs, ...)");
1051                 return ERROR_JTAG_INIT_FAILED;
1052         }
1053
1054         return ERROR_OK;
1055 }
1056
1057 /*
1058  * Validate the date loaded by entry to the Capture-IR state, to help
1059  * find errors related to scan chain configuration (wrong IR lengths)
1060  * or communication.
1061  *
1062  * Entry state can be anything.  On non-error exit, all TAPs are in
1063  * bypass mode.  On error exits, the scan chain is reset.
1064  */
1065 static int jtag_validate_ircapture(void)
1066 {
1067         jtag_tap_t *tap;
1068         int total_ir_length = 0;
1069         uint8_t *ir_test = NULL;
1070         scan_field_t field;
1071         int val;
1072         int chain_pos = 0;
1073         int retval;
1074
1075         for (tap = NULL, total_ir_length = 0;
1076                         (tap = jtag_tap_next_enabled(tap)) != NULL;
1077                         total_ir_length += tap->ir_length)
1078                 continue;
1079
1080         /* increase length to add 2 bit sentinel after scan */
1081         total_ir_length += 2;
1082
1083         ir_test = malloc(CEIL(total_ir_length, 8));
1084         if (ir_test == NULL)
1085                 return ERROR_FAIL;
1086
1087         /* after this scan, all TAPs will capture BYPASS instructions */
1088         buf_set_ones(ir_test, total_ir_length);
1089
1090         field.tap = NULL;
1091         field.num_bits = total_ir_length;
1092         field.out_value = ir_test;
1093         field.in_value = ir_test;
1094
1095         jtag_add_plain_ir_scan(1, &field, TAP_IDLE);
1096
1097         LOG_DEBUG("IR capture validation scan");
1098         retval = jtag_execute_queue();
1099         if (retval != ERROR_OK)
1100                 goto done;
1101
1102         tap = NULL;
1103         chain_pos = 0;
1104
1105         for (;;) {
1106                 tap = jtag_tap_next_enabled(tap);
1107                 if (tap == NULL) {
1108                         break;
1109                 }
1110
1111                 /* Validate the two LSBs, which must be 01 per JTAG spec.
1112                  * REVISIT we might be able to verify some MSBs too, using
1113                  * ircapture/irmask attributes.
1114                  */
1115                 val = buf_get_u32(ir_test, chain_pos, tap->ir_length);
1116                 if ((val & 0x3) != 1) {
1117                         LOG_ERROR("%s: IR capture error; saw 0x%0*x not 0x..1",
1118                                         jtag_tap_name(tap),
1119                                         (tap->ir_length + 7) / tap->ir_length,
1120                                         val);
1121
1122                         retval = ERROR_JTAG_INIT_FAILED;
1123                         goto done;
1124                 }
1125                 LOG_DEBUG("%s: IR capture 0x%0*x", jtag_tap_name(tap),
1126                                 (tap->ir_length + 7) / tap->ir_length, val);
1127                 chain_pos += tap->ir_length;
1128         }
1129
1130         /* verify the '11' sentinel we wrote is returned at the end */
1131         val = buf_get_u32(ir_test, chain_pos, 2);
1132         if (val != 0x3)
1133         {
1134                 char *cbuf = buf_to_str(ir_test, total_ir_length, 16);
1135
1136                 LOG_ERROR("IR capture error at bit %d, saw 0x%s not 0x...3",
1137                                 chain_pos, cbuf);
1138                 free(cbuf);
1139                 retval = ERROR_JTAG_INIT_FAILED;
1140         }
1141
1142 done:
1143         free(ir_test);
1144         if (retval != ERROR_OK) {
1145                 jtag_add_tlr();
1146                 jtag_execute_queue();
1147         }
1148         return retval;
1149 }
1150
1151
1152 void jtag_tap_init(jtag_tap_t *tap)
1153 {
1154         assert(0 != tap->ir_length);
1155
1156         /// @todo fix, this allocates one byte per bit for all three fields!
1157         tap->expected = malloc(tap->ir_length);
1158         tap->expected_mask = malloc(tap->ir_length);
1159         tap->cur_instr = malloc(tap->ir_length);
1160
1161         /// @todo cope sanely with ir_length bigger than 32 bits
1162         buf_set_u32(tap->expected, 0, tap->ir_length, tap->ir_capture_value);
1163         buf_set_u32(tap->expected_mask, 0, tap->ir_length, tap->ir_capture_mask);
1164         buf_set_ones(tap->cur_instr, tap->ir_length);
1165
1166         // place TAP in bypass mode
1167         tap->bypass = 1;
1168         // register the reset callback for the TAP
1169         jtag_register_event_callback(&jtag_reset_callback, tap);
1170
1171         LOG_DEBUG("Created Tap: %s @ abs position %d, "
1172                         "irlen %d, capture: 0x%x mask: 0x%x", tap->dotted_name,
1173                                 tap->abs_chain_position, tap->ir_length,
1174                                 (unsigned) tap->ir_capture_value,
1175                                 (unsigned) tap->ir_capture_mask);
1176         jtag_tap_add(tap);
1177 }
1178
1179 void jtag_tap_free(jtag_tap_t *tap)
1180 {
1181         jtag_unregister_event_callback(&jtag_reset_callback, tap);
1182
1183         /// @todo is anything missing? no memory leaks please
1184         free((void *)tap->expected);
1185         free((void *)tap->expected_ids);
1186         free((void *)tap->chip);
1187         free((void *)tap->tapname);
1188         free((void *)tap->dotted_name);
1189         free(tap);
1190 }
1191
1192 int jtag_interface_init(struct command_context_s *cmd_ctx)
1193 {
1194         if (jtag)
1195                 return ERROR_OK;
1196
1197         if (!jtag_interface)
1198         {
1199                 /* nothing was previously specified by "interface" command */
1200                 LOG_ERROR("JTAG interface has to be specified, see \"interface\" command");
1201                 return ERROR_JTAG_INVALID_INTERFACE;
1202         }
1203
1204         jtag = jtag_interface;
1205         if (jtag_interface->init() != ERROR_OK)
1206         {
1207                 jtag = NULL;
1208                 return ERROR_JTAG_INIT_FAILED;
1209         }
1210
1211         int requested_khz = jtag_get_speed_khz();
1212         int actual_khz = requested_khz;
1213         int retval = jtag_get_speed_readable(&actual_khz);
1214         if (ERROR_OK != retval)
1215                 LOG_INFO("interface specific clock speed value %d", jtag_get_speed());
1216         else if (actual_khz)
1217         {
1218                 if ((CLOCK_MODE_RCLK == clock_mode)
1219                         || ((CLOCK_MODE_KHZ == clock_mode) && !requested_khz))
1220                 {
1221                         LOG_INFO("RCLK (adaptive clock speed) not supported - fallback to %d kHz"
1222                                 , actual_khz);
1223                 }
1224                 else
1225                         LOG_INFO("clock speed %d kHz", actual_khz);
1226         }
1227         else
1228                 LOG_INFO("RCLK (adaptive clock speed)");
1229
1230         return ERROR_OK;
1231 }
1232
1233 static int jtag_init_inner(struct command_context_s *cmd_ctx)
1234 {
1235         jtag_tap_t *tap;
1236         int retval;
1237         bool issue_setup = true;
1238
1239         LOG_DEBUG("Init JTAG chain");
1240
1241         tap = jtag_tap_next_enabled(NULL);
1242         if (tap == NULL) {
1243                 LOG_ERROR("There are no enabled taps?");
1244                 return ERROR_JTAG_INIT_FAILED;
1245         }
1246
1247         jtag_add_tlr();
1248         if ((retval = jtag_execute_queue()) != ERROR_OK)
1249                 return retval;
1250
1251         /* examine chain first, as this could discover the real chain layout */
1252         if (jtag_examine_chain() != ERROR_OK)
1253         {
1254                 LOG_ERROR("Trying to use configured scan chain anyway...");
1255                 issue_setup = false;
1256         }
1257
1258         if (jtag_validate_ircapture() != ERROR_OK)
1259         {
1260                 LOG_WARNING("Errors during IR capture, continuing anyway...");
1261                 issue_setup = false;
1262         }
1263
1264         if (issue_setup)
1265                 jtag_notify_event(JTAG_TAP_EVENT_SETUP);
1266         else
1267                 LOG_WARNING("Bypassing JTAG setup events due to errors");
1268
1269
1270         return ERROR_OK;
1271 }
1272
1273 int jtag_interface_quit(void)
1274 {
1275         if (!jtag || !jtag->quit)
1276                 return ERROR_OK;
1277
1278         // close the JTAG interface
1279         int result = jtag->quit();
1280         if (ERROR_OK != result)
1281                 LOG_ERROR("failed: %d", result);
1282
1283         return ERROR_OK;
1284 }
1285
1286
1287 int jtag_init_reset(struct command_context_s *cmd_ctx)
1288 {
1289         int retval;
1290
1291         if ((retval = jtag_interface_init(cmd_ctx)) != ERROR_OK)
1292                 return retval;
1293
1294         LOG_DEBUG("Trying to bring the JTAG controller to life by asserting TRST / TLR");
1295
1296         /* Reset can happen after a power cycle.
1297          *
1298          * Ideally we would only assert TRST or run TLR before the target reset.
1299          *
1300          * However w/srst_pulls_trst, trst is asserted together with the target
1301          * reset whether we want it or not.
1302          *
1303          * NB! Some targets have JTAG circuitry disabled until a
1304          * trst & srst has been asserted.
1305          *
1306          * NB! here we assume nsrst/ntrst delay are sufficient!
1307          *
1308          * NB! order matters!!!! srst *can* disconnect JTAG circuitry
1309          *
1310          */
1311         jtag_add_reset(1, 0); /* TAP_RESET, using TMS+TCK or TRST */
1312         if (jtag_reset_config & RESET_HAS_SRST)
1313         {
1314                 jtag_add_reset(1, 1);
1315                 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) == 0)
1316                         jtag_add_reset(0, 1);
1317         }
1318         jtag_add_reset(0, 0);
1319         if ((retval = jtag_execute_queue()) != ERROR_OK)
1320                 return retval;
1321
1322         /* Check that we can communication on the JTAG chain + eventually we want to
1323          * be able to perform enumeration only after OpenOCD has started
1324          * telnet and GDB server
1325          *
1326          * That would allow users to more easily perform any magic they need to before
1327          * reset happens.
1328          */
1329         return jtag_init_inner(cmd_ctx);
1330 }
1331
1332 int jtag_init(struct command_context_s *cmd_ctx)
1333 {
1334         int retval;
1335         if ((retval = jtag_interface_init(cmd_ctx)) != ERROR_OK)
1336                 return retval;
1337         if (jtag_init_inner(cmd_ctx) == ERROR_OK)
1338         {
1339                 return ERROR_OK;
1340         }
1341         return jtag_init_reset(cmd_ctx);
1342 }
1343
1344 unsigned jtag_get_speed_khz(void)
1345 {
1346         return speed_khz;
1347 }
1348
1349 static int jtag_khz_to_speed(unsigned khz, int* speed)
1350 {
1351         LOG_DEBUG("convert khz to interface specific speed value");
1352         speed_khz = khz;
1353         if (jtag != NULL)
1354         {
1355                 LOG_DEBUG("have interface set up");
1356                 int speed_div1;
1357                 int retval = jtag->khz(jtag_get_speed_khz(), &speed_div1);
1358                 if (ERROR_OK != retval)
1359                 {
1360                         return retval;
1361                 }
1362                 *speed = speed_div1;
1363         }
1364         return ERROR_OK;
1365 }
1366
1367 static int jtag_rclk_to_speed(unsigned fallback_speed_khz, int* speed)
1368 {
1369         int retval = jtag_khz_to_speed(0, speed);
1370         if ((ERROR_OK != retval) && fallback_speed_khz)
1371         {
1372                 LOG_DEBUG("trying fallback speed...");
1373                 retval = jtag_khz_to_speed(fallback_speed_khz, speed);
1374         }
1375         return retval;
1376 }
1377
1378 static int jtag_set_speed(int speed)
1379 {
1380         jtag_speed = speed;
1381         /* this command can be called during CONFIG,
1382          * in which case jtag isn't initialized */
1383         return jtag ? jtag->speed(speed) : ERROR_OK;
1384 }
1385
1386 int jtag_config_speed(int speed)
1387 {
1388         LOG_DEBUG("handle jtag speed");
1389         clock_mode = CLOCK_MODE_SPEED;
1390         return jtag_set_speed(speed);
1391 }
1392
1393 int jtag_config_khz(unsigned khz)
1394 {
1395         LOG_DEBUG("handle jtag khz");
1396         clock_mode = CLOCK_MODE_KHZ;
1397         int speed = 0;
1398         int retval = jtag_khz_to_speed(khz, &speed);
1399         return (ERROR_OK != retval) ? retval : jtag_set_speed(speed);
1400 }
1401
1402 int jtag_config_rclk(unsigned fallback_speed_khz)
1403 {
1404         LOG_DEBUG("handle jtag rclk");
1405         clock_mode = CLOCK_MODE_RCLK;
1406         rclk_fallback_speed_khz = fallback_speed_khz;
1407         int speed = 0;
1408         int retval = jtag_rclk_to_speed(fallback_speed_khz, &speed);
1409         return (ERROR_OK != retval) ? retval : jtag_set_speed(speed);
1410 }
1411
1412 int jtag_get_speed(void)
1413 {
1414         int speed;
1415         switch(clock_mode)
1416         {
1417                 case CLOCK_MODE_SPEED:
1418                         speed = jtag_speed;
1419                         break;
1420                 case CLOCK_MODE_KHZ:
1421                         jtag_khz_to_speed(jtag_get_speed_khz(), &speed);
1422                         break;
1423                 case CLOCK_MODE_RCLK:
1424                         jtag_rclk_to_speed(rclk_fallback_speed_khz, &speed);
1425                         break;
1426                 default:
1427                         LOG_ERROR("BUG: unknown jtag clock mode");
1428                         speed = 0;
1429                         break;
1430         }
1431         return speed;
1432 }
1433
1434 int jtag_get_speed_readable(int *khz)
1435 {
1436         return jtag ? jtag->speed_div(jtag_get_speed(), khz) : ERROR_OK;
1437 }
1438
1439 void jtag_set_verify(bool enable)
1440 {
1441         jtag_verify = enable;
1442 }
1443
1444 bool jtag_will_verify()
1445 {
1446         return jtag_verify;
1447 }
1448
1449 void jtag_set_verify_capture_ir(bool enable)
1450 {
1451         jtag_verify_capture_ir = enable;
1452 }
1453
1454 bool jtag_will_verify_capture_ir()
1455 {
1456         return jtag_verify_capture_ir;
1457 }
1458
1459 int jtag_power_dropout(int *dropout)
1460 {
1461         return jtag->power_dropout(dropout);
1462 }
1463
1464 int jtag_srst_asserted(int *srst_asserted)
1465 {
1466         return jtag->srst_asserted(srst_asserted);
1467 }
1468
1469 enum reset_types jtag_get_reset_config(void)
1470 {
1471         return jtag_reset_config;
1472 }
1473 void jtag_set_reset_config(enum reset_types type)
1474 {
1475         jtag_reset_config = type;
1476 }
1477
1478 int jtag_get_trst(void)
1479 {
1480         return jtag_trst;
1481 }
1482 int jtag_get_srst(void)
1483 {
1484         return jtag_srst;
1485 }
1486
1487 void jtag_set_nsrst_delay(unsigned delay)
1488 {
1489         jtag_nsrst_delay = delay;
1490 }
1491 unsigned jtag_get_nsrst_delay(void)
1492 {
1493         return jtag_nsrst_delay;
1494 }
1495 void jtag_set_ntrst_delay(unsigned delay)
1496 {
1497         jtag_ntrst_delay = delay;
1498 }
1499 unsigned jtag_get_ntrst_delay(void)
1500 {
1501         return jtag_ntrst_delay;
1502 }
1503
1504
1505 void jtag_set_nsrst_assert_width(unsigned delay)
1506 {
1507         jtag_nsrst_assert_width = delay;
1508 }
1509 unsigned jtag_get_nsrst_assert_width(void)
1510 {
1511         return jtag_nsrst_assert_width;
1512 }
1513 void jtag_set_ntrst_assert_width(unsigned delay)
1514 {
1515         jtag_ntrst_assert_width = delay;
1516 }
1517 unsigned jtag_get_ntrst_assert_width(void)
1518 {
1519         return jtag_ntrst_assert_width;
1520 }