1 /***************************************************************************
2 * Copyright (C) 2009 Zachary T Welch *
3 * zw@superlucidity.net *
5 * Copyright (C) 2007,2008,2009 Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
8 * Copyright (C) 2009 SoftPLC Corporation *
12 * Copyright (C) 2005 by Dominic Rath *
13 * Dominic.Rath@gmx.de *
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. *
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. *
25 * You should have received a copy of the GNU General Public License *
26 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
27 ***************************************************************************/
35 #include "interface.h"
36 #include <transport/transport.h>
37 #include <helper/jep106.h>
43 /* SVF and XSVF are higher level JTAG command sets (for boundary scan) */
45 #include "xsvf/xsvf.h"
47 /** The number of JTAG queue flushes (for profiling and debugging purposes). */
48 static int jtag_flush_queue_count;
50 /* Sleep this # of ms after flushing the queue */
51 static int jtag_flush_queue_sleep;
53 static void jtag_add_scan_check(struct jtag_tap *active,
54 void (*jtag_add_scan)(struct jtag_tap *active,
56 const struct scan_field *in_fields,
58 int in_num_fields, struct scan_field *in_fields, tap_state_t state);
61 * The jtag_error variable is set when an error occurs while executing
62 * the queue. Application code may set this using jtag_set_error(),
63 * when an error occurs during processing that should be reported during
64 * jtag_execute_queue().
66 * The value is set and cleared, but never read by normal application code.
68 * This value is returned (and cleared) by jtag_execute_queue().
70 static int jtag_error = ERROR_OK;
72 static const char *jtag_event_strings[] = {
73 [JTAG_TRST_ASSERTED] = "TAP reset",
74 [JTAG_TAP_EVENT_SETUP] = "TAP setup",
75 [JTAG_TAP_EVENT_ENABLE] = "TAP enabled",
76 [JTAG_TAP_EVENT_DISABLE] = "TAP disabled",
80 * JTAG adapters must initialize with TRST and SRST de-asserted
81 * (they're negative logic, so that means *high*). But some
82 * hardware doesn't necessarily work that way ... so set things
83 * up so that jtag_init() always forces that state.
85 static int jtag_trst = -1;
86 static int jtag_srst = -1;
89 * List all TAPs that have been created.
91 static struct jtag_tap *__jtag_all_taps;
93 static enum reset_types jtag_reset_config = RESET_NONE;
94 tap_state_t cmd_queue_cur_state = TAP_RESET;
96 static bool jtag_verify_capture_ir = true;
97 static int jtag_verify = 1;
99 /* how long the OpenOCD should wait before attempting JTAG communication after reset lines
100 *deasserted (in ms) */
101 static int adapter_nsrst_delay; /* default to no nSRST delay */
102 static int jtag_ntrst_delay;/* default to no nTRST delay */
103 static int adapter_nsrst_assert_width; /* width of assertion */
104 static int jtag_ntrst_assert_width; /* width of assertion */
107 * Contains a single callback along with a pointer that will be passed
108 * when an event occurs.
110 struct jtag_event_callback {
111 /** a event callback */
112 jtag_event_handler_t callback;
113 /** the private data to pass to the callback */
115 /** the next callback */
116 struct jtag_event_callback *next;
119 /* callbacks to inform high-level handlers about JTAG state changes */
120 static struct jtag_event_callback *jtag_event_callbacks;
123 static int speed_khz;
124 /* speed to fallback to when RCLK is requested but not supported */
125 static int rclk_fallback_speed_khz;
126 static enum {CLOCK_MODE_UNSELECTED, CLOCK_MODE_KHZ, CLOCK_MODE_RCLK} clock_mode;
127 static int jtag_speed;
129 /* FIXME: change name to this variable, it is not anymore JTAG only */
130 static struct adapter_driver *jtag;
132 extern struct adapter_driver *adapter_driver;
134 void jtag_set_flush_queue_sleep(int ms)
136 jtag_flush_queue_sleep = ms;
139 void jtag_set_error(int error)
141 if ((error == ERROR_OK) || (jtag_error != ERROR_OK))
146 int jtag_error_clear(void)
148 int temp = jtag_error;
149 jtag_error = ERROR_OK;
155 static bool jtag_poll = 1;
157 bool is_jtag_poll_safe(void)
159 /* Polling can be disabled explicitly with set_enabled(false).
160 * It is also implicitly disabled while TRST is active and
161 * while SRST is gating the JTAG clock.
163 if (!transport_is_jtag())
166 if (!jtag_poll || jtag_trst != 0)
168 return jtag_srst == 0 || (jtag_reset_config & RESET_SRST_NO_GATING);
171 bool jtag_poll_get_enabled(void)
176 void jtag_poll_set_enabled(bool value)
183 struct jtag_tap *jtag_all_taps(void)
185 return __jtag_all_taps;
188 unsigned jtag_tap_count(void)
190 struct jtag_tap *t = jtag_all_taps();
199 unsigned jtag_tap_count_enabled(void)
201 struct jtag_tap *t = jtag_all_taps();
211 /** Append a new TAP to the chain of all taps. */
212 static void jtag_tap_add(struct jtag_tap *t)
214 unsigned jtag_num_taps = 0;
216 struct jtag_tap **tap = &__jtag_all_taps;
217 while (*tap != NULL) {
219 tap = &(*tap)->next_tap;
222 t->abs_chain_position = jtag_num_taps;
225 /* returns a pointer to the n-th device in the scan chain */
226 struct jtag_tap *jtag_tap_by_position(unsigned n)
228 struct jtag_tap *t = jtag_all_taps();
236 struct jtag_tap *jtag_tap_by_string(const char *s)
238 /* try by name first */
239 struct jtag_tap *t = jtag_all_taps();
242 if (0 == strcmp(t->dotted_name, s))
247 /* no tap found by name, so try to parse the name as a number */
249 if (parse_uint(s, &n) != ERROR_OK)
252 /* FIXME remove this numeric fallback code late June 2010, along
253 * with all info in the User's Guide that TAPs have numeric IDs.
254 * Also update "scan_chain" output to not display the numbers.
256 t = jtag_tap_by_position(n);
258 LOG_WARNING("Specify TAP '%s' by name, not number %u",
264 struct jtag_tap *jtag_tap_next_enabled(struct jtag_tap *p)
266 p = p ? p->next_tap : jtag_all_taps();
275 const char *jtag_tap_name(const struct jtag_tap *tap)
277 return (tap == NULL) ? "(unknown)" : tap->dotted_name;
281 int jtag_register_event_callback(jtag_event_handler_t callback, void *priv)
283 struct jtag_event_callback **callbacks_p = &jtag_event_callbacks;
285 if (callback == NULL)
286 return ERROR_COMMAND_SYNTAX_ERROR;
289 while ((*callbacks_p)->next)
290 callbacks_p = &((*callbacks_p)->next);
291 callbacks_p = &((*callbacks_p)->next);
294 (*callbacks_p) = malloc(sizeof(struct jtag_event_callback));
295 (*callbacks_p)->callback = callback;
296 (*callbacks_p)->priv = priv;
297 (*callbacks_p)->next = NULL;
302 int jtag_unregister_event_callback(jtag_event_handler_t callback, void *priv)
304 struct jtag_event_callback **p = &jtag_event_callbacks, *temp;
306 if (callback == NULL)
307 return ERROR_COMMAND_SYNTAX_ERROR;
310 if (((*p)->priv != priv) || ((*p)->callback != callback)) {
323 int jtag_call_event_callbacks(enum jtag_event event)
325 struct jtag_event_callback *callback = jtag_event_callbacks;
327 LOG_DEBUG("jtag event: %s", jtag_event_strings[event]);
330 struct jtag_event_callback *next;
332 /* callback may remove itself */
333 next = callback->next;
334 callback->callback(event, callback->priv);
341 static void jtag_checks(void)
343 assert(jtag_trst == 0);
346 static void jtag_prelude(tap_state_t state)
350 assert(state != TAP_INVALID);
352 cmd_queue_cur_state = state;
355 void jtag_add_ir_scan_noverify(struct jtag_tap *active, const struct scan_field *in_fields,
360 int retval = interface_jtag_add_ir_scan(active, in_fields, state);
361 jtag_set_error(retval);
364 static void jtag_add_ir_scan_noverify_callback(struct jtag_tap *active,
366 const struct scan_field *in_fields,
369 jtag_add_ir_scan_noverify(active, in_fields, state);
372 /* If fields->in_value is filled out, then the captured IR value will be checked */
373 void jtag_add_ir_scan(struct jtag_tap *active, struct scan_field *in_fields, tap_state_t state)
375 assert(state != TAP_RESET);
377 if (jtag_verify && jtag_verify_capture_ir) {
378 /* 8 x 32 bit id's is enough for all invocations */
380 /* if we are to run a verification of the ir scan, we need to get the input back.
381 * We may have to allocate space if the caller didn't ask for the input back.
383 in_fields->check_value = active->expected;
384 in_fields->check_mask = active->expected_mask;
385 jtag_add_scan_check(active, jtag_add_ir_scan_noverify_callback, 1, in_fields,
388 jtag_add_ir_scan_noverify(active, in_fields, state);
391 void jtag_add_plain_ir_scan(int num_bits, const uint8_t *out_bits, uint8_t *in_bits,
394 assert(out_bits != NULL);
395 assert(state != TAP_RESET);
399 int retval = interface_jtag_add_plain_ir_scan(
400 num_bits, out_bits, in_bits, state);
401 jtag_set_error(retval);
404 static int jtag_check_value_inner(uint8_t *captured, uint8_t *in_check_value,
405 uint8_t *in_check_mask, int num_bits);
407 static int jtag_check_value_mask_callback(jtag_callback_data_t data0,
408 jtag_callback_data_t data1,
409 jtag_callback_data_t data2,
410 jtag_callback_data_t data3)
412 return jtag_check_value_inner((uint8_t *)data0,
418 static void jtag_add_scan_check(struct jtag_tap *active, void (*jtag_add_scan)(
419 struct jtag_tap *active,
421 const struct scan_field *in_fields,
423 int in_num_fields, struct scan_field *in_fields, tap_state_t state)
425 jtag_add_scan(active, in_num_fields, in_fields, state);
427 for (int i = 0; i < in_num_fields; i++) {
428 if ((in_fields[i].check_value != NULL) && (in_fields[i].in_value != NULL)) {
429 jtag_add_callback4(jtag_check_value_mask_callback,
430 (jtag_callback_data_t)in_fields[i].in_value,
431 (jtag_callback_data_t)in_fields[i].check_value,
432 (jtag_callback_data_t)in_fields[i].check_mask,
433 (jtag_callback_data_t)in_fields[i].num_bits);
438 void jtag_add_dr_scan_check(struct jtag_tap *active,
440 struct scan_field *in_fields,
444 jtag_add_scan_check(active, jtag_add_dr_scan, in_num_fields, in_fields, state);
446 jtag_add_dr_scan(active, in_num_fields, in_fields, state);
450 void jtag_add_dr_scan(struct jtag_tap *active,
452 const struct scan_field *in_fields,
455 assert(state != TAP_RESET);
460 retval = interface_jtag_add_dr_scan(active, in_num_fields, in_fields, state);
461 jtag_set_error(retval);
464 void jtag_add_plain_dr_scan(int num_bits, const uint8_t *out_bits, uint8_t *in_bits,
467 assert(out_bits != NULL);
468 assert(state != TAP_RESET);
473 retval = interface_jtag_add_plain_dr_scan(num_bits, out_bits, in_bits, state);
474 jtag_set_error(retval);
477 void jtag_add_tlr(void)
479 jtag_prelude(TAP_RESET);
480 jtag_set_error(interface_jtag_add_tlr());
482 /* NOTE: order here matches TRST path in jtag_add_reset() */
483 jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
484 jtag_notify_event(JTAG_TRST_ASSERTED);
488 * If supported by the underlying adapter, this clocks a raw bit sequence
489 * onto TMS for switching betwen JTAG and SWD modes.
491 * DO NOT use this to bypass the integrity checks and logging provided
492 * by the jtag_add_pathmove() and jtag_add_statemove() calls.
494 * @param nbits How many bits to clock out.
495 * @param seq The bit sequence. The LSB is bit 0 of seq[0].
496 * @param state The JTAG tap state to record on completion. Use
497 * TAP_INVALID to represent being in in SWD mode.
499 * @todo Update naming conventions to stop assuming everything is JTAG.
501 int jtag_add_tms_seq(unsigned nbits, const uint8_t *seq, enum tap_state state)
505 if (!(jtag->jtag_ops->supported & DEBUG_CAP_TMS_SEQ))
506 return ERROR_JTAG_NOT_IMPLEMENTED;
509 cmd_queue_cur_state = state;
511 retval = interface_add_tms_seq(nbits, seq, state);
512 jtag_set_error(retval);
516 void jtag_add_pathmove(int num_states, const tap_state_t *path)
518 tap_state_t cur_state = cmd_queue_cur_state;
520 /* the last state has to be a stable state */
521 if (!tap_is_state_stable(path[num_states - 1])) {
522 LOG_ERROR("BUG: TAP path doesn't finish in a stable state");
523 jtag_set_error(ERROR_JTAG_NOT_STABLE_STATE);
527 for (int i = 0; i < num_states; i++) {
528 if (path[i] == TAP_RESET) {
529 LOG_ERROR("BUG: TAP_RESET is not a valid state for pathmove sequences");
530 jtag_set_error(ERROR_JTAG_STATE_INVALID);
534 if (tap_state_transition(cur_state, true) != path[i] &&
535 tap_state_transition(cur_state, false) != path[i]) {
536 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
537 tap_state_name(cur_state), tap_state_name(path[i]));
538 jtag_set_error(ERROR_JTAG_TRANSITION_INVALID);
546 jtag_set_error(interface_jtag_add_pathmove(num_states, path));
547 cmd_queue_cur_state = path[num_states - 1];
550 int jtag_add_statemove(tap_state_t goal_state)
552 tap_state_t cur_state = cmd_queue_cur_state;
554 if (goal_state != cur_state) {
555 LOG_DEBUG("cur_state=%s goal_state=%s",
556 tap_state_name(cur_state),
557 tap_state_name(goal_state));
560 /* If goal is RESET, be paranoid and force that that transition
561 * (e.g. five TCK cycles, TMS high). Else trust "cur_state".
563 if (goal_state == TAP_RESET)
565 else if (goal_state == cur_state)
568 else if (tap_is_state_stable(cur_state) && tap_is_state_stable(goal_state)) {
569 unsigned tms_bits = tap_get_tms_path(cur_state, goal_state);
570 unsigned tms_count = tap_get_tms_path_len(cur_state, goal_state);
571 tap_state_t moves[8];
572 assert(tms_count < ARRAY_SIZE(moves));
574 for (unsigned i = 0; i < tms_count; i++, tms_bits >>= 1) {
575 bool bit = tms_bits & 1;
577 cur_state = tap_state_transition(cur_state, bit);
578 moves[i] = cur_state;
581 jtag_add_pathmove(tms_count, moves);
582 } else if (tap_state_transition(cur_state, true) == goal_state
583 || tap_state_transition(cur_state, false) == goal_state)
584 jtag_add_pathmove(1, &goal_state);
591 void jtag_add_runtest(int num_cycles, tap_state_t state)
594 jtag_set_error(interface_jtag_add_runtest(num_cycles, state));
598 void jtag_add_clocks(int num_cycles)
600 if (!tap_is_state_stable(cmd_queue_cur_state)) {
601 LOG_ERROR("jtag_add_clocks() called with TAP in unstable state \"%s\"",
602 tap_state_name(cmd_queue_cur_state));
603 jtag_set_error(ERROR_JTAG_NOT_STABLE_STATE);
607 if (num_cycles > 0) {
609 jtag_set_error(interface_jtag_add_clocks(num_cycles));
613 static int adapter_system_reset(int req_srst)
618 if (!(jtag_reset_config & RESET_HAS_SRST)) {
619 LOG_ERROR("BUG: can't assert SRST");
625 /* Maybe change SRST signal state */
626 if (jtag_srst != req_srst) {
627 retval = jtag->reset(0, req_srst);
628 if (retval != ERROR_OK) {
629 LOG_ERROR("SRST error");
632 jtag_srst = req_srst;
635 LOG_DEBUG("SRST line asserted");
636 if (adapter_nsrst_assert_width)
637 jtag_sleep(adapter_nsrst_assert_width * 1000);
639 LOG_DEBUG("SRST line released");
640 if (adapter_nsrst_delay)
641 jtag_sleep(adapter_nsrst_delay * 1000);
648 static void legacy_jtag_add_reset(int req_tlr_or_trst, int req_srst)
650 int trst_with_tlr = 0;
654 /* Without SRST, we must use target-specific JTAG operations
655 * on each target; callers should not be requesting SRST when
656 * that signal doesn't exist.
658 * RESET_SRST_PULLS_TRST is a board or chip level quirk, which
659 * can kick in even if the JTAG adapter can't drive TRST.
662 if (!(jtag_reset_config & RESET_HAS_SRST)) {
663 LOG_ERROR("BUG: can't assert SRST");
664 jtag_set_error(ERROR_FAIL);
667 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) != 0
668 && !req_tlr_or_trst) {
669 LOG_ERROR("BUG: can't assert only SRST");
670 jtag_set_error(ERROR_FAIL);
676 /* JTAG reset (entry to TAP_RESET state) can always be achieved
677 * using TCK and TMS; that may go through a TAP_{IR,DR}UPDATE
678 * state first. TRST accelerates it, and bypasses those states.
680 * RESET_TRST_PULLS_SRST is a board or chip level quirk, which
681 * can kick in even if the JTAG adapter can't drive SRST.
683 if (req_tlr_or_trst) {
684 if (!(jtag_reset_config & RESET_HAS_TRST))
686 else if ((jtag_reset_config & RESET_TRST_PULLS_SRST) != 0
693 /* Maybe change TRST and/or SRST signal state */
694 if (jtag_srst != new_srst || jtag_trst != new_trst) {
697 retval = interface_jtag_add_reset(new_trst, new_srst);
698 if (retval != ERROR_OK)
699 jtag_set_error(retval);
701 retval = jtag_execute_queue();
703 if (retval != ERROR_OK) {
704 LOG_ERROR("TRST/SRST error");
709 /* SRST resets everything hooked up to that signal */
710 if (jtag_srst != new_srst) {
711 jtag_srst = new_srst;
713 LOG_DEBUG("SRST line asserted");
714 if (adapter_nsrst_assert_width)
715 jtag_add_sleep(adapter_nsrst_assert_width * 1000);
717 LOG_DEBUG("SRST line released");
718 if (adapter_nsrst_delay)
719 jtag_add_sleep(adapter_nsrst_delay * 1000);
723 /* Maybe enter the JTAG TAP_RESET state ...
724 * - using only TMS, TCK, and the JTAG state machine
725 * - or else more directly, using TRST
727 * TAP_RESET should be invisible to non-debug parts of the system.
730 LOG_DEBUG("JTAG reset with TLR instead of TRST");
733 } else if (jtag_trst != new_trst) {
734 jtag_trst = new_trst;
736 LOG_DEBUG("TRST line asserted");
737 tap_set_state(TAP_RESET);
738 if (jtag_ntrst_assert_width)
739 jtag_add_sleep(jtag_ntrst_assert_width * 1000);
741 LOG_DEBUG("TRST line released");
742 if (jtag_ntrst_delay)
743 jtag_add_sleep(jtag_ntrst_delay * 1000);
745 /* We just asserted nTRST, so we're now in TAP_RESET.
746 * Inform possible listeners about this, now that
747 * JTAG instructions and data can be shifted. This
748 * sequence must match jtag_add_tlr().
750 jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
751 jtag_notify_event(JTAG_TRST_ASSERTED);
756 /* FIXME: name is misleading; we do not plan to "add" reset into jtag queue */
757 void jtag_add_reset(int req_tlr_or_trst, int req_srst)
760 int trst_with_tlr = 0;
765 legacy_jtag_add_reset(req_tlr_or_trst, req_srst);
769 /* Without SRST, we must use target-specific JTAG operations
770 * on each target; callers should not be requesting SRST when
771 * that signal doesn't exist.
773 * RESET_SRST_PULLS_TRST is a board or chip level quirk, which
774 * can kick in even if the JTAG adapter can't drive TRST.
777 if (!(jtag_reset_config & RESET_HAS_SRST)) {
778 LOG_ERROR("BUG: can't assert SRST");
779 jtag_set_error(ERROR_FAIL);
782 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) != 0
783 && !req_tlr_or_trst) {
784 LOG_ERROR("BUG: can't assert only SRST");
785 jtag_set_error(ERROR_FAIL);
791 /* JTAG reset (entry to TAP_RESET state) can always be achieved
792 * using TCK and TMS; that may go through a TAP_{IR,DR}UPDATE
793 * state first. TRST accelerates it, and bypasses those states.
795 * RESET_TRST_PULLS_SRST is a board or chip level quirk, which
796 * can kick in even if the JTAG adapter can't drive SRST.
798 if (req_tlr_or_trst) {
799 if (!(jtag_reset_config & RESET_HAS_TRST))
801 else if ((jtag_reset_config & RESET_TRST_PULLS_SRST) != 0
808 /* Maybe change TRST and/or SRST signal state */
809 if (jtag_srst != new_srst || jtag_trst != new_trst) {
810 /* guarantee jtag queue empty before changing reset status */
811 jtag_execute_queue();
813 retval = jtag->reset(new_trst, new_srst);
814 if (retval != ERROR_OK) {
815 jtag_set_error(retval);
816 LOG_ERROR("TRST/SRST error");
821 /* SRST resets everything hooked up to that signal */
822 if (jtag_srst != new_srst) {
823 jtag_srst = new_srst;
825 LOG_DEBUG("SRST line asserted");
826 if (adapter_nsrst_assert_width)
827 jtag_add_sleep(adapter_nsrst_assert_width * 1000);
829 LOG_DEBUG("SRST line released");
830 if (adapter_nsrst_delay)
831 jtag_add_sleep(adapter_nsrst_delay * 1000);
835 /* Maybe enter the JTAG TAP_RESET state ...
836 * - using only TMS, TCK, and the JTAG state machine
837 * - or else more directly, using TRST
839 * TAP_RESET should be invisible to non-debug parts of the system.
842 LOG_DEBUG("JTAG reset with TLR instead of TRST");
844 jtag_execute_queue();
846 } else if (jtag_trst != new_trst) {
847 jtag_trst = new_trst;
849 LOG_DEBUG("TRST line asserted");
850 tap_set_state(TAP_RESET);
851 if (jtag_ntrst_assert_width)
852 jtag_add_sleep(jtag_ntrst_assert_width * 1000);
854 LOG_DEBUG("TRST line released");
855 if (jtag_ntrst_delay)
856 jtag_add_sleep(jtag_ntrst_delay * 1000);
858 /* We just asserted nTRST, so we're now in TAP_RESET.
859 * Inform possible listeners about this, now that
860 * JTAG instructions and data can be shifted. This
861 * sequence must match jtag_add_tlr().
863 jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
864 jtag_notify_event(JTAG_TRST_ASSERTED);
869 void jtag_add_sleep(uint32_t us)
871 /** @todo Here, keep_alive() appears to be a layering violation!!! */
873 jtag_set_error(interface_jtag_add_sleep(us));
876 static int jtag_check_value_inner(uint8_t *captured, uint8_t *in_check_value,
877 uint8_t *in_check_mask, int num_bits)
879 int retval = ERROR_OK;
883 compare_failed = buf_cmp_mask(captured, in_check_value, in_check_mask, num_bits);
885 compare_failed = buf_cmp(captured, in_check_value, num_bits);
887 if (compare_failed) {
888 char *captured_str, *in_check_value_str;
889 int bits = (num_bits > DEBUG_JTAG_IOZ) ? DEBUG_JTAG_IOZ : num_bits;
891 /* NOTE: we've lost diagnostic context here -- 'which tap' */
893 captured_str = buf_to_hex_str(captured, bits);
894 in_check_value_str = buf_to_hex_str(in_check_value, bits);
896 LOG_WARNING("Bad value '%s' captured during DR or IR scan:",
898 LOG_WARNING(" check_value: 0x%s", in_check_value_str);
901 free(in_check_value_str);
904 char *in_check_mask_str;
906 in_check_mask_str = buf_to_hex_str(in_check_mask, bits);
907 LOG_WARNING(" check_mask: 0x%s", in_check_mask_str);
908 free(in_check_mask_str);
911 retval = ERROR_JTAG_QUEUE_FAILED;
916 void jtag_check_value_mask(struct scan_field *field, uint8_t *value, uint8_t *mask)
918 assert(field->in_value != NULL);
921 /* no checking to do */
925 jtag_execute_queue_noclear();
927 int retval = jtag_check_value_inner(field->in_value, value, mask, field->num_bits);
928 jtag_set_error(retval);
931 int default_interface_jtag_execute_queue(void)
934 LOG_ERROR("No JTAG interface configured yet. "
935 "Issue 'init' command in startup scripts "
936 "before communicating with targets.");
940 if (!transport_is_jtag()) {
942 * FIXME: This should not happen!
943 * There could be old code that queues jtag commands with non jtag interfaces so, for
944 * the moment simply highlight it by log an error and return on empty execute_queue.
945 * We should fix it quitting with assert(0) because it is an internal error.
946 * The fix can be applied immediately after next release (v0.11.0 ?)
948 LOG_ERROR("JTAG API jtag_execute_queue() called on non JTAG interface");
949 if (!jtag->jtag_ops || !jtag->jtag_ops->execute_queue)
953 int result = jtag->jtag_ops->execute_queue();
955 struct jtag_command *cmd = jtag_command_queue;
956 while (debug_level >= LOG_LVL_DEBUG_IO && cmd) {
959 LOG_DEBUG_IO("JTAG %s SCAN to %s",
960 cmd->cmd.scan->ir_scan ? "IR" : "DR",
961 tap_state_name(cmd->cmd.scan->end_state));
962 for (int i = 0; i < cmd->cmd.scan->num_fields; i++) {
963 struct scan_field *field = cmd->cmd.scan->fields + i;
964 if (field->out_value) {
965 char *str = buf_to_hex_str(field->out_value, field->num_bits);
966 LOG_DEBUG_IO(" %db out: %s", field->num_bits, str);
969 if (field->in_value) {
970 char *str = buf_to_hex_str(field->in_value, field->num_bits);
971 LOG_DEBUG_IO(" %db in: %s", field->num_bits, str);
977 LOG_DEBUG_IO("JTAG TLR RESET to %s",
978 tap_state_name(cmd->cmd.statemove->end_state));
981 LOG_DEBUG_IO("JTAG RUNTEST %d cycles to %s",
982 cmd->cmd.runtest->num_cycles,
983 tap_state_name(cmd->cmd.runtest->end_state));
987 const char *reset_str[3] = {
988 "leave", "deassert", "assert"
990 LOG_DEBUG_IO("JTAG RESET %s TRST, %s SRST",
991 reset_str[cmd->cmd.reset->trst + 1],
992 reset_str[cmd->cmd.reset->srst + 1]);
996 LOG_DEBUG_IO("JTAG PATHMOVE (TODO)");
999 LOG_DEBUG_IO("JTAG SLEEP (TODO)");
1001 case JTAG_STABLECLOCKS:
1002 LOG_DEBUG_IO("JTAG STABLECLOCKS (TODO)");
1005 LOG_DEBUG_IO("JTAG TMS (TODO)");
1008 LOG_ERROR("Unknown JTAG command: %d", cmd->type);
1017 void jtag_execute_queue_noclear(void)
1019 jtag_flush_queue_count++;
1020 jtag_set_error(interface_jtag_execute_queue());
1022 if (jtag_flush_queue_sleep > 0) {
1023 /* For debug purposes it can be useful to test performance
1024 * or behavior when delaying after flushing the queue,
1025 * e.g. to simulate long roundtrip times.
1027 usleep(jtag_flush_queue_sleep * 1000);
1031 int jtag_get_flush_queue_count(void)
1033 return jtag_flush_queue_count;
1036 int jtag_execute_queue(void)
1038 jtag_execute_queue_noclear();
1039 return jtag_error_clear();
1042 static int jtag_reset_callback(enum jtag_event event, void *priv)
1044 struct jtag_tap *tap = priv;
1046 if (event == JTAG_TRST_ASSERTED) {
1047 tap->enabled = !tap->disabled_after_reset;
1049 /* current instruction is either BYPASS or IDCODE */
1050 buf_set_ones(tap->cur_instr, tap->ir_length);
1057 /* sleep at least us microseconds. When we sleep more than 1000ms we
1058 * do an alive sleep, i.e. keep GDB alive. Note that we could starve
1059 * GDB if we slept for <1000ms many times.
1061 void jtag_sleep(uint32_t us)
1066 alive_sleep((us+999)/1000);
1069 #define JTAG_MAX_AUTO_TAPS 20
1071 #define EXTRACT_JEP106_BANK(X) (((X) & 0xf00) >> 8)
1072 #define EXTRACT_JEP106_ID(X) (((X) & 0xfe) >> 1)
1073 #define EXTRACT_MFG(X) (((X) & 0xffe) >> 1)
1074 #define EXTRACT_PART(X) (((X) & 0xffff000) >> 12)
1075 #define EXTRACT_VER(X) (((X) & 0xf0000000) >> 28)
1077 /* A reserved manufacturer ID is used in END_OF_CHAIN_FLAG, so we
1078 * know that no valid TAP will have it as an IDCODE value.
1080 #define END_OF_CHAIN_FLAG 0xffffffff
1082 /* a larger IR length than we ever expect to autoprobe */
1083 #define JTAG_IRLEN_MAX 60
1085 static int jtag_examine_chain_execute(uint8_t *idcode_buffer, unsigned num_idcode)
1087 struct scan_field field = {
1088 .num_bits = num_idcode * 32,
1089 .out_value = idcode_buffer,
1090 .in_value = idcode_buffer,
1093 /* initialize to the end of chain ID value */
1094 for (unsigned i = 0; i < num_idcode; i++)
1095 buf_set_u32(idcode_buffer, i * 32, 32, END_OF_CHAIN_FLAG);
1097 jtag_add_plain_dr_scan(field.num_bits, field.out_value, field.in_value, TAP_DRPAUSE);
1099 return jtag_execute_queue();
1102 static bool jtag_examine_chain_check(uint8_t *idcodes, unsigned count)
1104 uint8_t zero_check = 0x0;
1105 uint8_t one_check = 0xff;
1107 for (unsigned i = 0; i < count * 4; i++) {
1108 zero_check |= idcodes[i];
1109 one_check &= idcodes[i];
1112 /* if there wasn't a single non-zero bit or if all bits were one,
1113 * the scan is not valid. We wrote a mix of both values; either
1115 * - There's a hardware issue (almost certainly):
1116 * + all-zeroes can mean a target stuck in JTAG reset
1117 * + all-ones tends to mean no target
1118 * - The scan chain is WAY longer than we can handle, *AND* either
1119 * + there are several hundreds of TAPs in bypass, or
1120 * + at least a few dozen TAPs all have an all-ones IDCODE
1122 if (zero_check == 0x00 || one_check == 0xff) {
1123 LOG_ERROR("JTAG scan chain interrogation failed: all %s",
1124 (zero_check == 0x00) ? "zeroes" : "ones");
1125 LOG_ERROR("Check JTAG interface, timings, target power, etc.");
1131 static void jtag_examine_chain_display(enum log_levels level, const char *msg,
1132 const char *name, uint32_t idcode)
1134 log_printf_lf(level, __FILE__, __LINE__, __func__,
1135 "JTAG tap: %s %16.16s: 0x%08x "
1136 "(mfg: 0x%3.3x (%s), part: 0x%4.4x, ver: 0x%1.1x)",
1138 (unsigned int)idcode,
1139 (unsigned int)EXTRACT_MFG(idcode),
1140 jep106_manufacturer(EXTRACT_JEP106_BANK(idcode), EXTRACT_JEP106_ID(idcode)),
1141 (unsigned int)EXTRACT_PART(idcode),
1142 (unsigned int)EXTRACT_VER(idcode));
1145 static bool jtag_idcode_is_final(uint32_t idcode)
1148 * Some devices, such as AVR8, will output all 1's instead
1149 * of TDI input value at end of chain. Allow those values
1150 * instead of failing.
1152 return idcode == END_OF_CHAIN_FLAG;
1156 * This helper checks that remaining bits in the examined chain data are
1157 * all as expected, but a single JTAG device requires only 64 bits to be
1158 * read back correctly. This can help identify and diagnose problems
1159 * with the JTAG chain earlier, gives more helpful/explicit error messages.
1160 * Returns TRUE iff garbage was found.
1162 static bool jtag_examine_chain_end(uint8_t *idcodes, unsigned count, unsigned max)
1164 bool triggered = false;
1165 for (; count < max - 31; count += 32) {
1166 uint32_t idcode = buf_get_u32(idcodes, count, 32);
1168 /* do not trigger the warning if the data looks good */
1169 if (jtag_idcode_is_final(idcode))
1171 LOG_WARNING("Unexpected idcode after end of chain: %d 0x%08x",
1172 count, (unsigned int)idcode);
1178 static bool jtag_examine_chain_match_tap(const struct jtag_tap *tap)
1181 if (tap->expected_ids_cnt == 0 || !tap->hasidcode)
1184 /* optionally ignore the JTAG version field - bits 28-31 of IDCODE */
1185 uint32_t mask = tap->ignore_version ? ~(0xfU << 28) : ~0U;
1186 uint32_t idcode = tap->idcode & mask;
1188 /* Loop over the expected identification codes and test for a match */
1189 for (unsigned ii = 0; ii < tap->expected_ids_cnt; ii++) {
1190 uint32_t expected = tap->expected_ids[ii] & mask;
1192 if (idcode == expected)
1195 /* treat "-expected-id 0" as a "don't-warn" wildcard */
1196 if (0 == tap->expected_ids[ii])
1200 /* If none of the expected ids matched, warn */
1201 jtag_examine_chain_display(LOG_LVL_WARNING, "UNEXPECTED",
1202 tap->dotted_name, tap->idcode);
1203 for (unsigned ii = 0; ii < tap->expected_ids_cnt; ii++) {
1206 snprintf(msg, sizeof(msg), "expected %u of %u", ii + 1, tap->expected_ids_cnt);
1207 jtag_examine_chain_display(LOG_LVL_ERROR, msg,
1208 tap->dotted_name, tap->expected_ids[ii]);
1213 /* Try to examine chain layout according to IEEE 1149.1 §12
1214 * This is called a "blind interrogation" of the scan chain.
1216 static int jtag_examine_chain(void)
1219 unsigned max_taps = jtag_tap_count();
1221 /* Autoprobe up to this many. */
1222 if (max_taps < JTAG_MAX_AUTO_TAPS)
1223 max_taps = JTAG_MAX_AUTO_TAPS;
1225 /* Add room for end-of-chain marker. */
1228 uint8_t *idcode_buffer = calloc(4, max_taps);
1229 if (idcode_buffer == NULL)
1230 return ERROR_JTAG_INIT_FAILED;
1232 /* DR scan to collect BYPASS or IDCODE register contents.
1233 * Then make sure the scan data has both ones and zeroes.
1235 LOG_DEBUG("DR scan interrogation for IDCODE/BYPASS");
1236 retval = jtag_examine_chain_execute(idcode_buffer, max_taps);
1237 if (retval != ERROR_OK)
1239 if (!jtag_examine_chain_check(idcode_buffer, max_taps)) {
1240 retval = ERROR_JTAG_INIT_FAILED;
1244 /* Point at the 1st predefined tap, if any */
1245 struct jtag_tap *tap = jtag_tap_next_enabled(NULL);
1247 unsigned bit_count = 0;
1248 unsigned autocount = 0;
1249 for (unsigned i = 0; i < max_taps; i++) {
1250 assert(bit_count < max_taps * 32);
1251 uint32_t idcode = buf_get_u32(idcode_buffer, bit_count, 32);
1253 /* No predefined TAP? Auto-probe. */
1255 /* Is there another TAP? */
1256 if (jtag_idcode_is_final(idcode))
1259 /* Default everything in this TAP except IR length.
1261 * REVISIT create a jtag_alloc(chip, tap) routine, and
1262 * share it with jim_newtap_cmd().
1264 tap = calloc(1, sizeof(*tap));
1266 retval = ERROR_FAIL;
1270 tap->chip = alloc_printf("auto%u", autocount++);
1271 tap->tapname = strdup("tap");
1272 tap->dotted_name = alloc_printf("%s.%s", tap->chip, tap->tapname);
1274 tap->ir_length = 0; /* ... signifying irlen autoprobe */
1275 tap->ir_capture_mask = 0x03;
1276 tap->ir_capture_value = 0x01;
1278 tap->enabled = true;
1283 if ((idcode & 1) == 0) {
1284 /* Zero for LSB indicates a device in bypass */
1285 LOG_INFO("TAP %s does not have valid IDCODE (idcode=0x%" PRIx32 ")",
1286 tap->dotted_name, idcode);
1287 tap->hasidcode = false;
1292 /* Friendly devices support IDCODE */
1293 tap->hasidcode = true;
1294 tap->idcode = idcode;
1295 jtag_examine_chain_display(LOG_LVL_INFO, "tap/device found", tap->dotted_name, idcode);
1300 /* ensure the TAP ID matches what was expected */
1301 if (!jtag_examine_chain_match_tap(tap))
1302 retval = ERROR_JTAG_INIT_SOFT_FAIL;
1304 tap = jtag_tap_next_enabled(tap);
1307 /* After those IDCODE or BYPASS register values should be
1308 * only the data we fed into the scan chain.
1310 if (jtag_examine_chain_end(idcode_buffer, bit_count, max_taps * 32)) {
1311 LOG_ERROR("double-check your JTAG setup (interface, speed, ...)");
1312 retval = ERROR_JTAG_INIT_FAILED;
1316 /* Return success or, for backwards compatibility if only
1317 * some IDCODE values mismatched, a soft/continuable fault.
1320 free(idcode_buffer);
1325 * Validate the date loaded by entry to the Capture-IR state, to help
1326 * find errors related to scan chain configuration (wrong IR lengths)
1329 * Entry state can be anything. On non-error exit, all TAPs are in
1330 * bypass mode. On error exits, the scan chain is reset.
1332 static int jtag_validate_ircapture(void)
1334 struct jtag_tap *tap;
1335 int total_ir_length = 0;
1336 uint8_t *ir_test = NULL;
1337 struct scan_field field;
1342 /* when autoprobing, accomodate huge IR lengths */
1343 for (tap = NULL, total_ir_length = 0;
1344 (tap = jtag_tap_next_enabled(tap)) != NULL;
1345 total_ir_length += tap->ir_length) {
1346 if (tap->ir_length == 0)
1347 total_ir_length += JTAG_IRLEN_MAX;
1350 /* increase length to add 2 bit sentinel after scan */
1351 total_ir_length += 2;
1353 ir_test = malloc(DIV_ROUND_UP(total_ir_length, 8));
1354 if (ir_test == NULL)
1357 /* after this scan, all TAPs will capture BYPASS instructions */
1358 buf_set_ones(ir_test, total_ir_length);
1360 field.num_bits = total_ir_length;
1361 field.out_value = ir_test;
1362 field.in_value = ir_test;
1364 jtag_add_plain_ir_scan(field.num_bits, field.out_value, field.in_value, TAP_IDLE);
1366 LOG_DEBUG("IR capture validation scan");
1367 retval = jtag_execute_queue();
1368 if (retval != ERROR_OK)
1375 tap = jtag_tap_next_enabled(tap);
1379 /* If we're autoprobing, guess IR lengths. They must be at
1380 * least two bits. Guessing will fail if (a) any TAP does
1381 * not conform to the JTAG spec; or (b) when the upper bits
1382 * captured from some conforming TAP are nonzero. Or if
1383 * (c) an IR length is longer than JTAG_IRLEN_MAX bits,
1384 * an implementation limit, which could someday be raised.
1386 * REVISIT optimization: if there's a *single* TAP we can
1387 * lift restrictions (a) and (b) by scanning a recognizable
1388 * pattern before the all-ones BYPASS. Check for where the
1389 * pattern starts in the result, instead of an 0...01 value.
1391 * REVISIT alternative approach: escape to some tcl code
1392 * which could provide more knowledge, based on IDCODE; and
1393 * only guess when that has no success.
1395 if (tap->ir_length == 0) {
1397 while ((val = buf_get_u64(ir_test, chain_pos, tap->ir_length + 1)) == 1
1398 && tap->ir_length < JTAG_IRLEN_MAX) {
1401 LOG_WARNING("AUTO %s - use \"jtag newtap %s %s -irlen %d "
1402 "-expected-id 0x%08" PRIx32 "\"",
1403 tap->dotted_name, tap->chip, tap->tapname, tap->ir_length, tap->idcode);
1406 /* Validate the two LSBs, which must be 01 per JTAG spec.
1408 * Or ... more bits could be provided by TAP declaration.
1409 * Plus, some taps (notably in i.MX series chips) violate
1410 * this part of the JTAG spec, so their capture mask/value
1411 * attributes might disable this test.
1413 val = buf_get_u64(ir_test, chain_pos, tap->ir_length);
1414 if ((val & tap->ir_capture_mask) != tap->ir_capture_value) {
1415 LOG_ERROR("%s: IR capture error; saw 0x%0*" PRIx64 " not 0x%0*" PRIx32,
1417 (tap->ir_length + 7) / tap->ir_length, val,
1418 (tap->ir_length + 7) / tap->ir_length, tap->ir_capture_value);
1420 retval = ERROR_JTAG_INIT_FAILED;
1423 LOG_DEBUG("%s: IR capture 0x%0*" PRIx64, jtag_tap_name(tap),
1424 (tap->ir_length + 7) / tap->ir_length, val);
1425 chain_pos += tap->ir_length;
1428 /* verify the '11' sentinel we wrote is returned at the end */
1429 val = buf_get_u64(ir_test, chain_pos, 2);
1431 char *cbuf = buf_to_hex_str(ir_test, total_ir_length);
1433 LOG_ERROR("IR capture error at bit %d, saw 0x%s not 0x...3",
1436 retval = ERROR_JTAG_INIT_FAILED;
1441 if (retval != ERROR_OK) {
1443 jtag_execute_queue();
1448 void jtag_tap_init(struct jtag_tap *tap)
1450 unsigned ir_len_bits;
1451 unsigned ir_len_bytes;
1453 /* if we're autoprobing, cope with potentially huge ir_length */
1454 ir_len_bits = tap->ir_length ? : JTAG_IRLEN_MAX;
1455 ir_len_bytes = DIV_ROUND_UP(ir_len_bits, 8);
1457 tap->expected = calloc(1, ir_len_bytes);
1458 tap->expected_mask = calloc(1, ir_len_bytes);
1459 tap->cur_instr = malloc(ir_len_bytes);
1461 /** @todo cope better with ir_length bigger than 32 bits */
1462 if (ir_len_bits > 32)
1465 buf_set_u32(tap->expected, 0, ir_len_bits, tap->ir_capture_value);
1466 buf_set_u32(tap->expected_mask, 0, ir_len_bits, tap->ir_capture_mask);
1468 /* TAP will be in bypass mode after jtag_validate_ircapture() */
1470 buf_set_ones(tap->cur_instr, tap->ir_length);
1472 /* register the reset callback for the TAP */
1473 jtag_register_event_callback(&jtag_reset_callback, tap);
1476 LOG_DEBUG("Created Tap: %s @ abs position %d, "
1477 "irlen %d, capture: 0x%x mask: 0x%x", tap->dotted_name,
1478 tap->abs_chain_position, tap->ir_length,
1479 (unsigned) tap->ir_capture_value,
1480 (unsigned) tap->ir_capture_mask);
1483 void jtag_tap_free(struct jtag_tap *tap)
1485 jtag_unregister_event_callback(&jtag_reset_callback, tap);
1487 struct jtag_tap_event_action *jteap = tap->event_action;
1489 struct jtag_tap_event_action *next = jteap->next;
1490 Jim_DecrRefCount(jteap->interp, jteap->body);
1495 free(tap->expected);
1496 free(tap->expected_mask);
1497 free(tap->expected_ids);
1498 free(tap->cur_instr);
1501 free(tap->dotted_name);
1506 * Do low-level setup like initializing registers, output signals,
1509 int adapter_init(struct command_context *cmd_ctx)
1514 if (!adapter_driver) {
1515 /* nothing was previously specified by "adapter driver" command */
1516 LOG_ERROR("Debug Adapter has to be specified, "
1517 "see \"adapter driver\" command");
1518 return ERROR_JTAG_INVALID_INTERFACE;
1522 retval = adapter_driver->init();
1523 if (retval != ERROR_OK)
1525 jtag = adapter_driver;
1527 if (jtag->speed == NULL) {
1528 LOG_INFO("This adapter doesn't support configurable speed");
1532 if (CLOCK_MODE_UNSELECTED == clock_mode) {
1533 LOG_ERROR("An adapter speed is not selected in the init script."
1534 " Insert a call to \"adapter speed\" or \"jtag_rclk\" to proceed.");
1535 return ERROR_JTAG_INIT_FAILED;
1538 int requested_khz = jtag_get_speed_khz();
1539 int actual_khz = requested_khz;
1540 int jtag_speed_var = 0;
1541 retval = jtag_get_speed(&jtag_speed_var);
1542 if (retval != ERROR_OK)
1544 retval = jtag->speed(jtag_speed_var);
1545 if (retval != ERROR_OK)
1547 retval = jtag_get_speed_readable(&actual_khz);
1548 if (ERROR_OK != retval)
1549 LOG_INFO("adapter-specific clock speed value %d", jtag_speed_var);
1550 else if (actual_khz) {
1551 /* Adaptive clocking -- JTAG-specific */
1552 if ((CLOCK_MODE_RCLK == clock_mode)
1553 || ((CLOCK_MODE_KHZ == clock_mode) && !requested_khz)) {
1554 LOG_INFO("RCLK (adaptive clock speed) not supported - fallback to %d kHz"
1557 LOG_INFO("clock speed %d kHz", actual_khz);
1559 LOG_INFO("RCLK (adaptive clock speed)");
1564 int jtag_init_inner(struct command_context *cmd_ctx)
1566 struct jtag_tap *tap;
1568 bool issue_setup = true;
1570 LOG_DEBUG("Init JTAG chain");
1572 tap = jtag_tap_next_enabled(NULL);
1574 /* Once JTAG itself is properly set up, and the scan chain
1575 * isn't absurdly large, IDCODE autoprobe should work fine.
1577 * But ... IRLEN autoprobe can fail even on systems which
1578 * are fully conformant to JTAG. Also, JTAG setup can be
1579 * quite finicky on some systems.
1581 * REVISIT: if TAP autoprobe works OK, then in many cases
1582 * we could escape to tcl code and set up targets based on
1583 * the TAP's IDCODE values.
1585 LOG_WARNING("There are no enabled taps. "
1586 "AUTO PROBING MIGHT NOT WORK!!");
1588 /* REVISIT default clock will often be too fast ... */
1592 retval = jtag_execute_queue();
1593 if (retval != ERROR_OK)
1596 /* Examine DR values first. This discovers problems which will
1597 * prevent communication ... hardware issues like TDO stuck, or
1598 * configuring the wrong number of (enabled) TAPs.
1600 retval = jtag_examine_chain();
1603 /* complete success */
1606 /* For backward compatibility reasons, try coping with
1607 * configuration errors involving only ID mismatches.
1608 * We might be able to talk to the devices.
1610 * Also the device might be powered down during startup.
1612 * After OpenOCD starts, we can try to power on the device
1615 LOG_ERROR("Trying to use configured scan chain anyway...");
1616 issue_setup = false;
1620 /* Now look at IR values. Problems here will prevent real
1621 * communication. They mostly mean that the IR length is
1622 * wrong ... or that the IR capture value is wrong. (The
1623 * latter is uncommon, but easily worked around: provide
1624 * ircapture/irmask values during TAP setup.)
1626 retval = jtag_validate_ircapture();
1627 if (retval != ERROR_OK) {
1628 /* The target might be powered down. The user
1629 * can power it up and reset it after firing
1632 issue_setup = false;
1636 jtag_notify_event(JTAG_TAP_EVENT_SETUP);
1638 LOG_WARNING("Bypassing JTAG setup events due to errors");
1644 int adapter_quit(void)
1646 if (jtag && jtag->quit) {
1647 /* close the JTAG interface */
1648 int result = jtag->quit();
1649 if (ERROR_OK != result)
1650 LOG_ERROR("failed: %d", result);
1653 struct jtag_tap *t = jtag_all_taps();
1655 struct jtag_tap *n = t->next_tap;
1663 int swd_init_reset(struct command_context *cmd_ctx)
1665 int retval, retval1;
1667 retval = adapter_init(cmd_ctx);
1668 if (retval != ERROR_OK)
1671 LOG_DEBUG("Initializing with hard SRST reset");
1673 if (jtag_reset_config & RESET_HAS_SRST)
1674 retval = adapter_system_reset(1);
1675 retval1 = adapter_system_reset(0);
1677 return (retval == ERROR_OK) ? retval1 : retval;
1680 int jtag_init_reset(struct command_context *cmd_ctx)
1682 int retval = adapter_init(cmd_ctx);
1683 if (retval != ERROR_OK)
1686 LOG_DEBUG("Initializing with hard TRST+SRST reset");
1689 * This procedure is used by default when OpenOCD triggers a reset.
1690 * It's now done through an overridable Tcl "init_reset" wrapper.
1692 * This started out as a more powerful "get JTAG working" reset than
1693 * jtag_init_inner(), applying TRST because some chips won't activate
1694 * JTAG without a TRST cycle (presumed to be async, though some of
1695 * those chips synchronize JTAG activation using TCK).
1697 * But some chips only activate JTAG as part of an SRST cycle; SRST
1698 * got mixed in. So it became a hard reset routine, which got used
1699 * in more places, and which coped with JTAG reset being forced as
1700 * part of SRST (srst_pulls_trst).
1702 * And even more corner cases started to surface: TRST and/or SRST
1703 * assertion timings matter; some chips need other JTAG operations;
1704 * TRST/SRST sequences can need to be different from these, etc.
1706 * Systems should override that wrapper to support system-specific
1707 * requirements that this not-fully-generic code doesn't handle.
1709 * REVISIT once Tcl code can read the reset_config modes, this won't
1710 * need to be a C routine at all...
1712 if (jtag_reset_config & RESET_HAS_SRST) {
1713 jtag_add_reset(1, 1);
1714 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) == 0)
1715 jtag_add_reset(0, 1);
1717 jtag_add_reset(1, 0); /* TAP_RESET, using TMS+TCK or TRST */
1720 /* some targets enable us to connect with srst asserted */
1721 if (jtag_reset_config & RESET_CNCT_UNDER_SRST) {
1722 if (jtag_reset_config & RESET_SRST_NO_GATING)
1723 jtag_add_reset(0, 1);
1725 LOG_WARNING("\'srst_nogate\' reset_config option is required");
1726 jtag_add_reset(0, 0);
1729 jtag_add_reset(0, 0);
1730 retval = jtag_execute_queue();
1731 if (retval != ERROR_OK)
1734 /* Check that we can communication on the JTAG chain + eventually we want to
1735 * be able to perform enumeration only after OpenOCD has started
1736 * telnet and GDB server
1738 * That would allow users to more easily perform any magic they need to before
1741 return jtag_init_inner(cmd_ctx);
1744 int jtag_init(struct command_context *cmd_ctx)
1746 int retval = adapter_init(cmd_ctx);
1747 if (retval != ERROR_OK)
1750 /* guard against oddball hardware: force resets to be inactive */
1751 jtag_add_reset(0, 0);
1753 /* some targets enable us to connect with srst asserted */
1754 if (jtag_reset_config & RESET_CNCT_UNDER_SRST) {
1755 if (jtag_reset_config & RESET_SRST_NO_GATING)
1756 jtag_add_reset(0, 1);
1758 LOG_WARNING("\'srst_nogate\' reset_config option is required");
1760 retval = jtag_execute_queue();
1761 if (retval != ERROR_OK)
1764 if (Jim_Eval_Named(cmd_ctx->interp, "jtag_init", __FILE__, __LINE__) != JIM_OK)
1770 unsigned jtag_get_speed_khz(void)
1775 static int adapter_khz_to_speed(unsigned khz, int *speed)
1777 LOG_DEBUG("convert khz to interface specific speed value");
1781 LOG_DEBUG("have interface set up");
1783 LOG_ERROR("Translation from khz to jtag_speed not implemented");
1787 int retval = jtag->khz(jtag_get_speed_khz(), &speed_div1);
1788 if (ERROR_OK != retval)
1790 *speed = speed_div1;
1794 static int jtag_rclk_to_speed(unsigned fallback_speed_khz, int *speed)
1796 int retval = adapter_khz_to_speed(0, speed);
1797 if ((ERROR_OK != retval) && fallback_speed_khz) {
1798 LOG_DEBUG("trying fallback speed...");
1799 retval = adapter_khz_to_speed(fallback_speed_khz, speed);
1804 static int jtag_set_speed(int speed)
1807 /* this command can be called during CONFIG,
1808 * in which case jtag isn't initialized */
1809 return jtag ? jtag->speed(speed) : ERROR_OK;
1812 int jtag_config_khz(unsigned khz)
1814 LOG_DEBUG("handle jtag khz");
1815 clock_mode = CLOCK_MODE_KHZ;
1817 int retval = adapter_khz_to_speed(khz, &speed);
1818 return (ERROR_OK != retval) ? retval : jtag_set_speed(speed);
1821 int jtag_config_rclk(unsigned fallback_speed_khz)
1823 LOG_DEBUG("handle jtag rclk");
1824 clock_mode = CLOCK_MODE_RCLK;
1825 rclk_fallback_speed_khz = fallback_speed_khz;
1827 int retval = jtag_rclk_to_speed(fallback_speed_khz, &speed);
1828 return (ERROR_OK != retval) ? retval : jtag_set_speed(speed);
1831 int jtag_get_speed(int *speed)
1833 switch (clock_mode) {
1834 case CLOCK_MODE_KHZ:
1835 adapter_khz_to_speed(jtag_get_speed_khz(), speed);
1837 case CLOCK_MODE_RCLK:
1838 jtag_rclk_to_speed(rclk_fallback_speed_khz, speed);
1841 LOG_ERROR("BUG: unknown jtag clock mode");
1847 int jtag_get_speed_readable(int *khz)
1849 int jtag_speed_var = 0;
1850 int retval = jtag_get_speed(&jtag_speed_var);
1851 if (retval != ERROR_OK)
1855 if (!jtag->speed_div) {
1856 LOG_ERROR("Translation from jtag_speed to khz not implemented");
1859 return jtag->speed_div(jtag_speed_var, khz);
1862 void jtag_set_verify(bool enable)
1864 jtag_verify = enable;
1867 bool jtag_will_verify(void)
1872 void jtag_set_verify_capture_ir(bool enable)
1874 jtag_verify_capture_ir = enable;
1877 bool jtag_will_verify_capture_ir(void)
1879 return jtag_verify_capture_ir;
1882 int jtag_power_dropout(int *dropout)
1885 /* TODO: as the jtag interface is not valid all
1886 * we can do at the moment is exit OpenOCD */
1887 LOG_ERROR("No Valid JTAG Interface Configured.");
1890 if (jtag->power_dropout)
1891 return jtag->power_dropout(dropout);
1893 *dropout = 0; /* by default we can't detect power dropout */
1897 int jtag_srst_asserted(int *srst_asserted)
1899 if (jtag->srst_asserted)
1900 return jtag->srst_asserted(srst_asserted);
1902 *srst_asserted = 0; /* by default we can't detect srst asserted */
1906 enum reset_types jtag_get_reset_config(void)
1908 return jtag_reset_config;
1910 void jtag_set_reset_config(enum reset_types type)
1912 jtag_reset_config = type;
1915 int jtag_get_trst(void)
1917 return jtag_trst == 1;
1919 int jtag_get_srst(void)
1921 return jtag_srst == 1;
1924 void jtag_set_nsrst_delay(unsigned delay)
1926 adapter_nsrst_delay = delay;
1928 unsigned jtag_get_nsrst_delay(void)
1930 return adapter_nsrst_delay;
1932 void jtag_set_ntrst_delay(unsigned delay)
1934 jtag_ntrst_delay = delay;
1936 unsigned jtag_get_ntrst_delay(void)
1938 return jtag_ntrst_delay;
1942 void jtag_set_nsrst_assert_width(unsigned delay)
1944 adapter_nsrst_assert_width = delay;
1946 unsigned jtag_get_nsrst_assert_width(void)
1948 return adapter_nsrst_assert_width;
1950 void jtag_set_ntrst_assert_width(unsigned delay)
1952 jtag_ntrst_assert_width = delay;
1954 unsigned jtag_get_ntrst_assert_width(void)
1956 return jtag_ntrst_assert_width;
1959 static int jtag_select(struct command_context *ctx)
1963 /* NOTE: interface init must already have been done.
1964 * That works with only C code ... no Tcl glue required.
1967 retval = jtag_register_commands(ctx);
1969 if (retval != ERROR_OK)
1972 retval = svf_register_commands(ctx);
1974 if (retval != ERROR_OK)
1977 return xsvf_register_commands(ctx);
1980 static struct transport jtag_transport = {
1982 .select = jtag_select,
1986 static void jtag_constructor(void) __attribute__((constructor));
1987 static void jtag_constructor(void)
1989 transport_register(&jtag_transport);
1992 /** Returns true if the current debug session
1993 * is using JTAG as its transport.
1995 bool transport_is_jtag(void)
1997 return get_current_transport() == &jtag_transport;
2000 int adapter_resets(int trst, int srst)
2002 if (get_current_transport() == NULL) {
2003 LOG_ERROR("transport is not selected");
2007 if (transport_is_jtag()) {
2008 if (srst == SRST_ASSERT && !(jtag_reset_config & RESET_HAS_SRST)) {
2009 LOG_ERROR("adapter has no srst signal");
2013 /* adapters without trst signal will eventually use tlr sequence */
2014 jtag_add_reset(trst, srst);
2016 * The jtag queue is still used for reset by some adapter. Flush it!
2017 * FIXME: To be removed when all adapter drivers will be updated!
2019 jtag_execute_queue();
2021 } else if (transport_is_swd() || transport_is_hla() ||
2022 transport_is_dapdirect_swd() || transport_is_dapdirect_jtag() ||
2023 transport_is_swim()) {
2024 if (trst == TRST_ASSERT) {
2025 LOG_ERROR("transport %s has no trst signal",
2026 get_current_transport()->name);
2030 if (srst == SRST_ASSERT && !(jtag_reset_config & RESET_HAS_SRST)) {
2031 LOG_ERROR("adapter has no srst signal");
2034 adapter_system_reset(srst);
2038 if (trst == TRST_DEASSERT && srst == SRST_DEASSERT)
2041 LOG_ERROR("reset is not supported on transport %s",
2042 get_current_transport()->name);
2047 int adapter_assert_reset(void)
2049 if (transport_is_jtag()) {
2050 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
2051 jtag_add_reset(1, 1);
2053 jtag_add_reset(0, 1);
2055 } else if (transport_is_swd() || transport_is_hla() ||
2056 transport_is_dapdirect_jtag() || transport_is_dapdirect_swd() ||
2057 transport_is_swim())
2058 return adapter_system_reset(1);
2059 else if (get_current_transport() != NULL)
2060 LOG_ERROR("reset is not supported on %s",
2061 get_current_transport()->name);
2063 LOG_ERROR("transport is not selected");
2067 int adapter_deassert_reset(void)
2069 if (transport_is_jtag()) {
2070 jtag_add_reset(0, 0);
2072 } else if (transport_is_swd() || transport_is_hla() ||
2073 transport_is_dapdirect_jtag() || transport_is_dapdirect_swd() ||
2074 transport_is_swim())
2075 return adapter_system_reset(0);
2076 else if (get_current_transport() != NULL)
2077 LOG_ERROR("reset is not supported on %s",
2078 get_current_transport()->name);
2080 LOG_ERROR("transport is not selected");
2084 int adapter_config_trace(bool enabled, enum tpiu_pin_protocol pin_protocol,
2085 uint32_t port_size, unsigned int *trace_freq,
2086 unsigned int traceclkin_freq, uint16_t *prescaler)
2088 if (jtag->config_trace) {
2089 return jtag->config_trace(enabled, pin_protocol, port_size, trace_freq,
2090 traceclkin_freq, prescaler);
2091 } else if (enabled) {
2092 LOG_ERROR("The selected interface does not support tracing");
2099 int adapter_poll_trace(uint8_t *buf, size_t *size)
2101 if (jtag->poll_trace)
2102 return jtag->poll_trace(buf, size);