1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
5 * Copyright (C) 2007,2008 Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
8 * Copyright (C) 2009 SoftPLC Corporation *
12 * Copyright (C) 2009 Zachary T Welch *
13 * zw@superlucidity.net *
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, write to the *
27 * Free Software Foundation, Inc., *
28 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
29 ***************************************************************************/
35 #include "minidriver.h"
36 #include "interface.h"
43 /// The number of JTAG queue flushes (for profiling and debugging purposes).
44 static int jtag_flush_queue_count
;
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
);
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().
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().
59 static int jtag_error
= ERROR_OK
;
61 static const char *jtag_event_strings
[] =
63 [JTAG_TRST_ASSERTED
] = "JTAG controller reset (RESET or TRST)",
64 [JTAG_TAP_EVENT_ENABLE
] = "TAP enabled",
65 [JTAG_TAP_EVENT_DISABLE
] = "TAP disabled",
68 static int jtag_trst
= 0;
69 static int jtag_srst
= 0;
72 * List all TAPs that have been created.
74 static jtag_tap_t
*__jtag_all_taps
= NULL
;
76 * The number of TAPs in the __jtag_all_taps list, used to track the
77 * assigned chain position to new TAPs
79 static unsigned jtag_num_taps
= 0;
81 static enum reset_types jtag_reset_config
= RESET_NONE
;
82 static tap_state_t cmd_queue_end_state
= TAP_RESET
;
83 tap_state_t cmd_queue_cur_state
= TAP_RESET
;
85 static bool jtag_verify_capture_ir
= true;
86 static int jtag_verify
= 1;
88 /* how long the OpenOCD should wait before attempting JTAG communication after reset lines deasserted (in ms) */
89 static int jtag_nsrst_delay
= 0; /* default to no nSRST delay */
90 static int jtag_ntrst_delay
= 0; /* default to no nTRST delay */
92 typedef struct jtag_event_callback_s
94 jtag_event_handler_t callback
;
96 struct jtag_event_callback_s
* next
;
97 } jtag_event_callback_t
;
99 /* callbacks to inform high-level handlers about JTAG state changes */
100 static jtag_event_callback_t
*jtag_event_callbacks
;
103 static int speed_khz
= 0;
104 /* flag if the kHz speed was defined */
105 static bool hasKHz
= false;
106 static int jtag_speed
= 0;
108 static struct jtag_interface_s
*jtag
= NULL
;
111 jtag_interface_t
*jtag_interface
= NULL
;
113 void jtag_set_error(int error
)
115 if ((error
== ERROR_OK
) || (jtag_error
!= ERROR_OK
))
119 int jtag_get_error(void)
123 int jtag_error_clear(void)
125 int temp
= jtag_error
;
126 jtag_error
= ERROR_OK
;
131 jtag_tap_t
*jtag_all_taps(void)
133 return __jtag_all_taps
;
136 unsigned jtag_tap_count(void)
138 return jtag_num_taps
;
141 unsigned jtag_tap_count_enabled(void)
143 jtag_tap_t
*t
= jtag_all_taps();
154 /// Append a new TAP to the chain of all taps.
155 void jtag_tap_add(struct jtag_tap_s
*t
)
157 t
->abs_chain_position
= jtag_num_taps
++;
159 jtag_tap_t
**tap
= &__jtag_all_taps
;
161 tap
= &(*tap
)->next_tap
;
165 /* returns a pointer to the n-th device in the scan chain */
166 static inline jtag_tap_t
*jtag_tap_by_position(unsigned n
)
168 jtag_tap_t
*t
= jtag_all_taps();
176 jtag_tap_t
*jtag_tap_by_string(const char *s
)
178 /* try by name first */
179 jtag_tap_t
*t
= jtag_all_taps();
183 if (0 == strcmp(t
->dotted_name
, s
))
188 /* no tap found by name, so try to parse the name as a number */
190 if (parse_uint(s
, &n
) != ERROR_OK
)
193 /* FIXME remove this numeric fallback code late June 2010, along
194 * with all info in the User's Guide that TAPs have numeric IDs.
195 * Also update "scan_chain" output to not display the numbers.
197 t
= jtag_tap_by_position(n
);
199 LOG_WARNING("Specify TAP '%s' by name, not number %u",
205 jtag_tap_t
*jtag_tap_by_jim_obj(Jim_Interp
*interp
, Jim_Obj
*o
)
207 const char *cp
= Jim_GetString(o
, NULL
);
208 jtag_tap_t
*t
= cp
? jtag_tap_by_string(cp
) : NULL
;
212 Jim_SetResult_sprintf(interp
, "Tap '%s' could not be found", cp
);
216 jtag_tap_t
* jtag_tap_next_enabled(jtag_tap_t
* p
)
218 p
= p
? p
->next_tap
: jtag_all_taps();
228 const char *jtag_tap_name(const jtag_tap_t
*tap
)
230 return (tap
== NULL
) ? "(unknown)" : tap
->dotted_name
;
234 int jtag_register_event_callback(jtag_event_handler_t callback
, void *priv
)
236 jtag_event_callback_t
**callbacks_p
= &jtag_event_callbacks
;
238 if (callback
== NULL
)
240 return ERROR_INVALID_ARGUMENTS
;
245 while ((*callbacks_p
)->next
)
246 callbacks_p
= &((*callbacks_p
)->next
);
247 callbacks_p
= &((*callbacks_p
)->next
);
250 (*callbacks_p
) = malloc(sizeof(jtag_event_callback_t
));
251 (*callbacks_p
)->callback
= callback
;
252 (*callbacks_p
)->priv
= priv
;
253 (*callbacks_p
)->next
= NULL
;
258 int jtag_unregister_event_callback(jtag_event_handler_t callback
, void *priv
)
260 jtag_event_callback_t
**callbacks_p
;
261 jtag_event_callback_t
**next
;
263 if (callback
== NULL
)
265 return ERROR_INVALID_ARGUMENTS
;
268 for (callbacks_p
= &jtag_event_callbacks
;
269 *callbacks_p
!= NULL
;
272 next
= &((*callbacks_p
)->next
);
274 if ((*callbacks_p
)->priv
!= priv
)
277 if ((*callbacks_p
)->callback
== callback
)
280 *callbacks_p
= *next
;
287 int jtag_call_event_callbacks(enum jtag_event event
)
289 jtag_event_callback_t
*callback
= jtag_event_callbacks
;
291 LOG_DEBUG("jtag event: %s", jtag_event_strings
[event
]);
295 jtag_event_callback_t
*next
;
297 /* callback may remove itself */
298 next
= callback
->next
;
299 callback
->callback(event
, callback
->priv
);
306 static void jtag_checks(void)
308 assert(jtag_trst
== 0);
311 static void jtag_prelude(tap_state_t state
)
315 assert(state
!= TAP_INVALID
);
317 cmd_queue_cur_state
= state
;
320 void jtag_alloc_in_value32(scan_field_t
*field
)
322 interface_jtag_alloc_in_value32(field
);
325 void jtag_add_ir_scan_noverify(int in_count
, const scan_field_t
*in_fields
,
330 int retval
= interface_jtag_add_ir_scan(in_count
, in_fields
, state
);
331 jtag_set_error(retval
);
335 void jtag_add_ir_scan(int in_num_fields
, scan_field_t
*in_fields
, tap_state_t state
)
337 if (jtag_verify
&& jtag_verify_capture_ir
)
339 /* 8 x 32 bit id's is enough for all invocations */
341 for (int j
= 0; j
< in_num_fields
; j
++)
343 /* if we are to run a verification of the ir scan, we need to get the input back.
344 * We may have to allocate space if the caller didn't ask for the input back.
346 in_fields
[j
].check_value
= in_fields
[j
].tap
->expected
;
347 in_fields
[j
].check_mask
= in_fields
[j
].tap
->expected_mask
;
349 jtag_add_scan_check(jtag_add_ir_scan_noverify
, in_num_fields
, in_fields
, state
);
352 jtag_add_ir_scan_noverify(in_num_fields
, in_fields
, state
);
356 void jtag_add_plain_ir_scan(int in_num_fields
, const scan_field_t
*in_fields
,
361 int retval
= interface_jtag_add_plain_ir_scan(
362 in_num_fields
, in_fields
, state
);
363 jtag_set_error(retval
);
366 void jtag_add_callback(jtag_callback1_t f
, jtag_callback_data_t data0
)
368 interface_jtag_add_callback(f
, data0
);
371 void jtag_add_callback4(jtag_callback_t f
, jtag_callback_data_t data0
,
372 jtag_callback_data_t data1
, jtag_callback_data_t data2
,
373 jtag_callback_data_t data3
)
375 interface_jtag_add_callback4(f
, data0
, data1
, data2
, data3
);
378 int jtag_check_value_inner(uint8_t *captured
, uint8_t *in_check_value
, uint8_t *in_check_mask
, int num_bits
);
380 static int jtag_check_value_mask_callback(jtag_callback_data_t data0
, jtag_callback_data_t data1
, jtag_callback_data_t data2
, jtag_callback_data_t data3
)
382 return jtag_check_value_inner((uint8_t *)data0
, (uint8_t *)data1
, (uint8_t *)data2
, (int)data3
);
385 static void jtag_add_scan_check(void (*jtag_add_scan
)(int in_num_fields
, const scan_field_t
*in_fields
, tap_state_t state
),
386 int in_num_fields
, scan_field_t
*in_fields
, tap_state_t state
)
388 for (int i
= 0; i
< in_num_fields
; i
++)
390 struct scan_field_s
*field
= &in_fields
[i
];
391 field
->allocated
= 0;
393 if (field
->check_value
|| field
->in_value
)
395 interface_jtag_add_scan_check_alloc(field
);
399 jtag_add_scan(in_num_fields
, in_fields
, state
);
401 for (int i
= 0; i
< in_num_fields
; i
++)
403 if ((in_fields
[i
].check_value
!= NULL
) && (in_fields
[i
].in_value
!= NULL
))
405 /* this is synchronous for a minidriver */
406 jtag_add_callback4(jtag_check_value_mask_callback
, (jtag_callback_data_t
)in_fields
[i
].in_value
,
407 (jtag_callback_data_t
)in_fields
[i
].check_value
,
408 (jtag_callback_data_t
)in_fields
[i
].check_mask
,
409 (jtag_callback_data_t
)in_fields
[i
].num_bits
);
411 if (in_fields
[i
].allocated
)
413 free(in_fields
[i
].in_value
);
415 if (in_fields
[i
].modified
)
417 in_fields
[i
].in_value
= NULL
;
422 void jtag_add_dr_scan_check(int in_num_fields
, scan_field_t
*in_fields
, tap_state_t state
)
426 jtag_add_scan_check(jtag_add_dr_scan
, in_num_fields
, in_fields
, state
);
429 jtag_add_dr_scan(in_num_fields
, in_fields
, state
);
434 void jtag_add_dr_scan(int in_num_fields
, const scan_field_t
*in_fields
,
440 retval
= interface_jtag_add_dr_scan(in_num_fields
, in_fields
, state
);
441 jtag_set_error(retval
);
444 void jtag_add_plain_dr_scan(int in_num_fields
, const scan_field_t
*in_fields
,
450 retval
= interface_jtag_add_plain_dr_scan(in_num_fields
, in_fields
, state
);
451 jtag_set_error(retval
);
454 void jtag_add_dr_out(jtag_tap_t
* tap
,
455 int num_fields
, const int* num_bits
, const uint32_t* value
,
456 tap_state_t end_state
)
458 assert(end_state
!= TAP_INVALID
);
460 cmd_queue_cur_state
= end_state
;
462 interface_jtag_add_dr_out(tap
,
463 num_fields
, num_bits
, value
,
467 void jtag_add_tlr(void)
469 jtag_prelude(TAP_RESET
);
470 jtag_set_error(interface_jtag_add_tlr());
471 jtag_call_event_callbacks(JTAG_TRST_ASSERTED
);
474 void jtag_add_pathmove(int num_states
, const tap_state_t
*path
)
476 tap_state_t cur_state
= cmd_queue_cur_state
;
478 /* the last state has to be a stable state */
479 if (!tap_is_state_stable(path
[num_states
- 1]))
481 LOG_ERROR("BUG: TAP path doesn't finish in a stable state");
482 jtag_set_error(ERROR_JTAG_NOT_STABLE_STATE
);
486 for (int i
= 0; i
< num_states
; i
++)
488 if (path
[i
] == TAP_RESET
)
490 LOG_ERROR("BUG: TAP_RESET is not a valid state for pathmove sequences");
491 jtag_set_error(ERROR_JTAG_STATE_INVALID
);
495 if (tap_state_transition(cur_state
, true) != path
[i
]
496 && tap_state_transition(cur_state
, false) != path
[i
])
498 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
499 tap_state_name(cur_state
), tap_state_name(path
[i
]));
500 jtag_set_error(ERROR_JTAG_TRANSITION_INVALID
);
508 jtag_set_error(interface_jtag_add_pathmove(num_states
, path
));
509 cmd_queue_cur_state
= path
[num_states
- 1];
512 int jtag_add_statemove(tap_state_t goal_state
)
514 tap_state_t cur_state
= cmd_queue_cur_state
;
516 LOG_DEBUG("cur_state=%s goal_state=%s",
517 tap_state_name(cur_state
),
518 tap_state_name(goal_state
));
521 if (goal_state
== cur_state
)
522 ; /* nothing to do */
523 else if (goal_state
== TAP_RESET
)
527 else if (tap_is_state_stable(cur_state
) && tap_is_state_stable(goal_state
))
529 unsigned tms_bits
= tap_get_tms_path(cur_state
, goal_state
);
530 unsigned tms_count
= tap_get_tms_path_len(cur_state
, goal_state
);
531 tap_state_t moves
[8];
532 assert(tms_count
< DIM(moves
));
534 for (unsigned i
= 0; i
< tms_count
; i
++, tms_bits
>>= 1)
536 bool bit
= tms_bits
& 1;
538 cur_state
= tap_state_transition(cur_state
, bit
);
539 moves
[i
] = cur_state
;
542 jtag_add_pathmove(tms_count
, moves
);
544 else if (tap_state_transition(cur_state
, true) == goal_state
545 || tap_state_transition(cur_state
, false) == goal_state
)
547 jtag_add_pathmove(1, &goal_state
);
556 void jtag_add_runtest(int num_cycles
, tap_state_t state
)
559 jtag_set_error(interface_jtag_add_runtest(num_cycles
, state
));
563 void jtag_add_clocks(int num_cycles
)
565 if (!tap_is_state_stable(cmd_queue_cur_state
))
567 LOG_ERROR("jtag_add_clocks() called with TAP in unstable state \"%s\"",
568 tap_state_name(cmd_queue_cur_state
));
569 jtag_set_error(ERROR_JTAG_NOT_STABLE_STATE
);
576 jtag_set_error(interface_jtag_add_clocks(num_cycles
));
580 void jtag_add_reset(int req_tlr_or_trst
, int req_srst
)
582 int trst_with_tlr
= 0;
584 /* FIX!!! there are *many* different cases here. A better
585 * approach is needed for legal combinations of transitions...
587 if ((jtag_reset_config
& RESET_HAS_SRST
)&&
588 (jtag_reset_config
& RESET_HAS_TRST
)&&
589 ((jtag_reset_config
& RESET_SRST_PULLS_TRST
) == 0))
591 if (((req_tlr_or_trst
&&!jtag_trst
)||
592 (!req_tlr_or_trst
&& jtag_trst
))&&
593 ((req_srst
&&!jtag_srst
)||
594 (!req_srst
&& jtag_srst
)))
596 /* FIX!!! srst_pulls_trst allows 1,1 => 0,0 transition.... */
597 //LOG_ERROR("BUG: transition of req_tlr_or_trst and req_srst in the same jtag_add_reset() call is undefined");
601 /* Make sure that jtag_reset_config allows the requested reset */
602 /* if SRST pulls TRST, we can't fulfill srst == 1 with trst == 0 */
603 if (((jtag_reset_config
& RESET_SRST_PULLS_TRST
) && (req_srst
== 1)) && (!req_tlr_or_trst
))
605 LOG_ERROR("BUG: requested reset would assert trst");
606 jtag_set_error(ERROR_FAIL
);
610 /* if TRST pulls SRST, we reset with TAP T-L-R */
611 if (((jtag_reset_config
& RESET_TRST_PULLS_SRST
) && (req_tlr_or_trst
)) && (req_srst
== 0))
616 if (req_srst
&& !(jtag_reset_config
& RESET_HAS_SRST
))
618 LOG_ERROR("BUG: requested SRST assertion, but the current configuration doesn't support this");
619 jtag_set_error(ERROR_FAIL
);
625 if (!trst_with_tlr
&& (jtag_reset_config
& RESET_HAS_TRST
))
637 jtag_srst
= req_srst
;
639 int retval
= interface_jtag_add_reset(jtag_trst
, jtag_srst
);
640 if (retval
!= ERROR_OK
)
642 jtag_set_error(retval
);
645 jtag_execute_queue();
649 LOG_DEBUG("SRST line asserted");
653 LOG_DEBUG("SRST line released");
654 if (jtag_nsrst_delay
)
655 jtag_add_sleep(jtag_nsrst_delay
* 1000);
660 LOG_DEBUG("JTAG reset with RESET instead of TRST");
661 jtag_set_end_state(TAP_RESET
);
668 /* we just asserted nTRST, so we're now in Test-Logic-Reset,
669 * and inform possible listeners about this
671 LOG_DEBUG("TRST line asserted");
672 tap_set_state(TAP_RESET
);
673 jtag_call_event_callbacks(JTAG_TRST_ASSERTED
);
677 if (jtag_ntrst_delay
)
678 jtag_add_sleep(jtag_ntrst_delay
* 1000);
682 tap_state_t
jtag_set_end_state(tap_state_t state
)
684 if ((state
== TAP_DRSHIFT
)||(state
== TAP_IRSHIFT
))
686 LOG_ERROR("BUG: TAP_DRSHIFT/IRSHIFT can't be end state. Calling code should use a larger scan field");
689 if (state
!= TAP_INVALID
)
690 cmd_queue_end_state
= state
;
691 return cmd_queue_end_state
;
694 tap_state_t
jtag_get_end_state(void)
696 return cmd_queue_end_state
;
699 void jtag_add_sleep(uint32_t us
)
701 /// @todo Here, keep_alive() appears to be a layering violation!!!
703 jtag_set_error(interface_jtag_add_sleep(us
));
706 int jtag_check_value_inner(uint8_t *captured
, uint8_t *in_check_value
, uint8_t *in_check_mask
, int num_bits
)
708 int retval
= ERROR_OK
;
710 int compare_failed
= 0;
713 compare_failed
= buf_cmp_mask(captured
, in_check_value
, in_check_mask
, num_bits
);
715 compare_failed
= buf_cmp(captured
, in_check_value
, num_bits
);
717 if (compare_failed
) {
718 /* An error handler could have caught the failing check
719 * only report a problem when there wasn't a handler, or if the handler
720 * acknowledged the error
723 LOG_WARNING("TAP %s:",
724 jtag_tap_name(field->tap));
728 char *captured_char
= buf_to_str(captured
, (num_bits
> DEBUG_JTAG_IOZ
) ? DEBUG_JTAG_IOZ
: num_bits
, 16);
729 char *in_check_value_char
= buf_to_str(in_check_value
, (num_bits
> DEBUG_JTAG_IOZ
) ? DEBUG_JTAG_IOZ
: num_bits
, 16);
733 char *in_check_mask_char
;
734 in_check_mask_char
= buf_to_str(in_check_mask
, (num_bits
> DEBUG_JTAG_IOZ
) ? DEBUG_JTAG_IOZ
: num_bits
, 16);
735 LOG_WARNING("value captured during scan didn't pass the requested check:");
736 LOG_WARNING("captured: 0x%s check_value: 0x%s check_mask: 0x%s",
737 captured_char
, in_check_value_char
, in_check_mask_char
);
738 free(in_check_mask_char
);
742 LOG_WARNING("value captured during scan didn't pass the requested check: captured: 0x%s check_value: 0x%s", captured_char
, in_check_value_char
);
746 free(in_check_value_char
);
748 retval
= ERROR_JTAG_QUEUE_FAILED
;
755 void jtag_check_value_mask(scan_field_t
*field
, uint8_t *value
, uint8_t *mask
)
757 assert(field
->in_value
!= NULL
);
761 /* no checking to do */
765 jtag_execute_queue_noclear();
767 int retval
= jtag_check_value_inner(field
->in_value
, value
, mask
, field
->num_bits
);
768 jtag_set_error(retval
);
773 int default_interface_jtag_execute_queue(void)
777 LOG_ERROR("No JTAG interface configured yet. "
778 "Issue 'init' command in startup scripts "
779 "before communicating with targets.");
783 return jtag
->execute_queue();
786 void jtag_execute_queue_noclear(void)
788 jtag_flush_queue_count
++;
789 jtag_set_error(interface_jtag_execute_queue());
792 int jtag_get_flush_queue_count(void)
794 return jtag_flush_queue_count
;
797 int jtag_execute_queue(void)
799 jtag_execute_queue_noclear();
800 return jtag_error_clear();
803 static int jtag_reset_callback(enum jtag_event event
, void *priv
)
805 jtag_tap_t
*tap
= priv
;
809 if (event
== JTAG_TRST_ASSERTED
)
811 tap
->enabled
= !tap
->disabled_after_reset
;
813 buf_set_ones(tap
->cur_instr
, tap
->ir_length
);
820 void jtag_sleep(uint32_t us
)
822 alive_sleep(us
/1000);
825 /// maximum number of JTAG devices expected in the chain
826 #define JTAG_MAX_CHAIN_SIZE 20
828 #define EXTRACT_MFG(X) (((X) & 0xffe) >> 1)
829 #define EXTRACT_PART(X) (((X) & 0xffff000) >> 12)
830 #define EXTRACT_VER(X) (((X) & 0xf0000000) >> 28)
832 static int jtag_examine_chain_execute(uint8_t *idcode_buffer
, unsigned num_idcode
)
834 scan_field_t field
= {
836 .num_bits
= num_idcode
* 32,
837 .out_value
= idcode_buffer
,
838 .in_value
= idcode_buffer
,
841 // initialize to the end of chain ID value
842 for (unsigned i
= 0; i
< JTAG_MAX_CHAIN_SIZE
; i
++)
843 buf_set_u32(idcode_buffer
, i
* 32, 32, 0x000000FF);
845 jtag_add_plain_dr_scan(1, &field
, TAP_RESET
);
846 return jtag_execute_queue();
849 static bool jtag_examine_chain_check(uint8_t *idcodes
, unsigned count
)
851 uint8_t zero_check
= 0x0;
852 uint8_t one_check
= 0xff;
854 for (unsigned i
= 0; i
< count
* 4; i
++)
856 zero_check
|= idcodes
[i
];
857 one_check
&= idcodes
[i
];
860 /* if there wasn't a single non-zero bit or if all bits were one,
861 * the scan is not valid */
862 if (zero_check
== 0x00 || one_check
== 0xff)
864 LOG_ERROR("JTAG communication failure: check connection, "
865 "JTAG interface, target power etc.");
871 static void jtag_examine_chain_display(enum log_levels level
, const char *msg
,
872 const char *name
, uint32_t idcode
)
874 log_printf_lf(level
, __FILE__
, __LINE__
, __FUNCTION__
,
875 "JTAG tap: %s %16.16s: 0x%08x "
876 "(mfg: 0x%3.3x, part: 0x%4.4x, ver: 0x%1.1x)",
878 (unsigned int)idcode
,
879 (unsigned int)EXTRACT_MFG(idcode
),
880 (unsigned int)EXTRACT_PART(idcode
),
881 (unsigned int)EXTRACT_VER(idcode
));
884 static bool jtag_idcode_is_final(uint32_t idcode
)
886 return idcode
== 0x000000FF || idcode
== 0xFFFFFFFF;
890 * This helper checks that remaining bits in the examined chain data are
891 * all as expected, but a single JTAG device requires only 64 bits to be
892 * read back correctly. This can help identify and diagnose problems
893 * with the JTAG chain earlier, gives more helpful/explicit error messages.
895 static void jtag_examine_chain_end(uint8_t *idcodes
, unsigned count
, unsigned max
)
897 bool triggered
= false;
898 for (; count
< max
- 31; count
+= 32)
900 uint32_t idcode
= buf_get_u32(idcodes
, count
, 32);
901 // do not trigger the warning if the data looks good
902 if (!triggered
&& jtag_idcode_is_final(idcode
))
904 LOG_WARNING("Unexpected idcode after end of chain: %d 0x%08x",
905 count
, (unsigned int)idcode
);
910 static bool jtag_examine_chain_match_tap(const struct jtag_tap_s
*tap
)
912 if (0 == tap
->expected_ids_cnt
)
914 /// @todo Enable LOG_INFO to ask for reports about unknown TAP IDs.
916 LOG_INFO("Uknown JTAG TAP ID: 0x%08x", tap
->idcode
)
917 LOG_INFO("Please report the chip name and reported ID code to the openocd project");
922 /* Loop over the expected identification codes and test for a match */
924 for (ii
= 0; ii
< tap
->expected_ids_cnt
; ii
++)
926 if (tap
->idcode
== tap
->expected_ids
[ii
])
930 /* If none of the expected ids matched, log an error */
931 if (ii
!= tap
->expected_ids_cnt
)
933 LOG_INFO("JTAG Tap/device matched");
936 jtag_examine_chain_display(LOG_LVL_ERROR
, "got",
937 tap
->dotted_name
, tap
->idcode
);
938 for (ii
= 0; ii
< tap
->expected_ids_cnt
; ii
++)
941 snprintf(msg
, sizeof(msg
), "expected %hhu of %hhu",
942 ii
+ 1, tap
->expected_ids_cnt
);
943 jtag_examine_chain_display(LOG_LVL_ERROR
, msg
,
944 tap
->dotted_name
, tap
->expected_ids
[ii
]);
949 /* Try to examine chain layout according to IEEE 1149.1 §12
951 int jtag_examine_chain(void)
953 uint8_t idcode_buffer
[JTAG_MAX_CHAIN_SIZE
* 4];
954 unsigned device_count
= 0;
956 jtag_examine_chain_execute(idcode_buffer
, JTAG_MAX_CHAIN_SIZE
);
958 if (!jtag_examine_chain_check(idcode_buffer
, JTAG_MAX_CHAIN_SIZE
))
959 return ERROR_JTAG_INIT_FAILED
;
961 /* point at the 1st tap */
962 jtag_tap_t
*tap
= jtag_tap_next_enabled(NULL
);
965 LOG_ERROR("JTAG: No taps enabled?");
966 return ERROR_JTAG_INIT_FAILED
;
969 for (unsigned bit_count
= 0; bit_count
< (JTAG_MAX_CHAIN_SIZE
* 32) - 31;)
971 uint32_t idcode
= buf_get_u32(idcode_buffer
, bit_count
, 32);
972 if ((idcode
& 1) == 0)
974 /* LSB must not be 0, this indicates a device in bypass */
975 LOG_WARNING("Tap/Device does not have IDCODE");
983 * End of chain (invalid manufacturer ID) some devices, such
984 * as AVR will output all 1's instead of TDI input value at
987 if (jtag_idcode_is_final(idcode
))
989 jtag_examine_chain_end(idcode_buffer
,
990 bit_count
+ 32, JTAG_MAX_CHAIN_SIZE
* 32);
994 jtag_examine_chain_display(LOG_LVL_INFO
, "tap/device found",
995 tap
? tap
->dotted_name
: "(not-named)",
1004 tap
->idcode
= idcode
;
1006 // ensure the TAP ID does matches what was expected
1007 if (!jtag_examine_chain_match_tap(tap
))
1008 return ERROR_JTAG_INIT_FAILED
;
1010 tap
= jtag_tap_next_enabled(tap
);
1013 /* see if number of discovered devices matches configuration */
1014 if (device_count
!= jtag_tap_count_enabled())
1016 LOG_ERROR("number of discovered devices in JTAG chain (%i) "
1017 "does not match (enabled) configuration (%i), total taps: %d",
1018 device_count
, jtag_tap_count_enabled(), jtag_tap_count());
1019 LOG_ERROR("check the config file and ensure proper JTAG communication"
1020 " (connections, speed, ...)");
1021 return ERROR_JTAG_INIT_FAILED
;
1027 int jtag_validate_chain(void)
1030 int total_ir_length
= 0;
1031 uint8_t *ir_test
= NULL
;
1036 total_ir_length
= 0;
1038 tap
= jtag_tap_next_enabled(tap
);
1042 total_ir_length
+= tap
->ir_length
;
1045 total_ir_length
+= 2;
1046 ir_test
= malloc(CEIL(total_ir_length
, 8));
1047 buf_set_ones(ir_test
, total_ir_length
);
1050 field
.num_bits
= total_ir_length
;
1051 field
.out_value
= ir_test
;
1052 field
.in_value
= ir_test
;
1055 jtag_add_plain_ir_scan(1, &field
, TAP_RESET
);
1056 jtag_execute_queue();
1062 tap
= jtag_tap_next_enabled(tap
);
1067 val
= buf_get_u32(ir_test
, chain_pos
, 2);
1070 char *cbuf
= buf_to_str(ir_test
, total_ir_length
, 16);
1071 LOG_ERROR("Could not validate JTAG scan chain, IR mismatch, scan returned 0x%s. tap=%s pos=%d expected 0x1 got %0x", cbuf
, jtag_tap_name(tap
), chain_pos
, val
);
1074 return ERROR_JTAG_INIT_FAILED
;
1076 chain_pos
+= tap
->ir_length
;
1079 val
= buf_get_u32(ir_test
, chain_pos
, 2);
1082 char *cbuf
= buf_to_str(ir_test
, total_ir_length
, 16);
1083 LOG_ERROR("Could not validate end of JTAG scan chain, IR mismatch, scan returned 0x%s. pos=%d expected 0x3 got %0x", cbuf
, chain_pos
, val
);
1086 return ERROR_JTAG_INIT_FAILED
;
1095 void jtag_tap_init(jtag_tap_t
*tap
)
1097 assert(0 != tap
->ir_length
);
1099 tap
->expected
= malloc(tap
->ir_length
);
1100 tap
->expected_mask
= malloc(tap
->ir_length
);
1101 tap
->cur_instr
= malloc(tap
->ir_length
);
1103 /// @todo cope sanely with ir_length bigger than 32 bits
1104 buf_set_u32(tap
->expected
, 0, tap
->ir_length
, tap
->ir_capture_value
);
1105 buf_set_u32(tap
->expected_mask
, 0, tap
->ir_length
, tap
->ir_capture_mask
);
1106 buf_set_ones(tap
->cur_instr
, tap
->ir_length
);
1108 // place TAP in bypass mode
1110 // register the reset callback for the TAP
1111 jtag_register_event_callback(&jtag_reset_callback
, tap
);
1113 LOG_DEBUG("Created Tap: %s @ abs position %d, "
1114 "irlen %d, capture: 0x%x mask: 0x%x", tap
->dotted_name
,
1115 tap
->abs_chain_position
, tap
->ir_length
,
1116 (unsigned int)(tap
->ir_capture_value
), (unsigned int)(tap
->ir_capture_mask
));
1120 void jtag_tap_free(jtag_tap_t
*tap
)
1122 jtag_unregister_event_callback(&jtag_reset_callback
, tap
);
1124 /// @todo is anything missing? no memory leaks please
1125 free((void *)tap
->expected_ids
);
1126 free((void *)tap
->chip
);
1127 free((void *)tap
->tapname
);
1128 free((void *)tap
->dotted_name
);
1132 int jtag_interface_init(struct command_context_s
*cmd_ctx
)
1137 if (!jtag_interface
)
1139 /* nothing was previously specified by "interface" command */
1140 LOG_ERROR("JTAG interface has to be specified, see \"interface\" command");
1141 return ERROR_JTAG_INVALID_INTERFACE
;
1145 jtag_interface
->khz(jtag_get_speed_khz(), &jtag_speed
);
1149 if (jtag_interface
->init() != ERROR_OK
)
1150 return ERROR_JTAG_INIT_FAILED
;
1152 jtag
= jtag_interface
;
1156 static int jtag_init_inner(struct command_context_s
*cmd_ctx
)
1161 LOG_DEBUG("Init JTAG chain");
1163 tap
= jtag_tap_next_enabled(NULL
);
1165 LOG_ERROR("There are no enabled taps?");
1166 return ERROR_JTAG_INIT_FAILED
;
1170 if ((retval
= jtag_execute_queue()) != ERROR_OK
)
1173 /* examine chain first, as this could discover the real chain layout */
1174 if (jtag_examine_chain() != ERROR_OK
)
1176 LOG_ERROR("trying to validate configured JTAG chain anyway...");
1179 if (jtag_validate_chain() != ERROR_OK
)
1181 LOG_WARNING("Could not validate JTAG chain, continuing anyway...");
1187 int jtag_interface_quit(void)
1189 if (!jtag
|| !jtag
->quit
)
1192 // close the JTAG interface
1193 int result
= jtag
->quit();
1194 if (ERROR_OK
!= result
)
1195 LOG_ERROR("failed: %d", result
);
1201 int jtag_init_reset(struct command_context_s
*cmd_ctx
)
1205 if ((retval
= jtag_interface_init(cmd_ctx
)) != ERROR_OK
)
1208 LOG_DEBUG("Trying to bring the JTAG controller to life by asserting TRST / RESET");
1210 /* Reset can happen after a power cycle.
1212 * Ideally we would only assert TRST or run RESET before the target reset.
1214 * However w/srst_pulls_trst, trst is asserted together with the target
1215 * reset whether we want it or not.
1217 * NB! Some targets have JTAG circuitry disabled until a
1218 * trst & srst has been asserted.
1220 * NB! here we assume nsrst/ntrst delay are sufficient!
1222 * NB! order matters!!!! srst *can* disconnect JTAG circuitry
1225 jtag_add_reset(1, 0); /* RESET or TRST */
1226 if (jtag_reset_config
& RESET_HAS_SRST
)
1228 jtag_add_reset(1, 1);
1229 if ((jtag_reset_config
& RESET_SRST_PULLS_TRST
) == 0)
1230 jtag_add_reset(0, 1);
1232 jtag_add_reset(0, 0);
1233 if ((retval
= jtag_execute_queue()) != ERROR_OK
)
1236 /* Check that we can communication on the JTAG chain + eventually we want to
1237 * be able to perform enumeration only after OpenOCD has started
1238 * telnet and GDB server
1240 * That would allow users to more easily perform any magic they need to before
1243 return jtag_init_inner(cmd_ctx
);
1246 int jtag_init(struct command_context_s
*cmd_ctx
)
1249 if ((retval
= jtag_interface_init(cmd_ctx
)) != ERROR_OK
)
1251 if (jtag_init_inner(cmd_ctx
) == ERROR_OK
)
1255 return jtag_init_reset(cmd_ctx
);
1258 void jtag_set_speed_khz(unsigned khz
)
1262 unsigned jtag_get_speed_khz(void)
1266 int jtag_config_khz(unsigned khz
)
1268 LOG_DEBUG("handle jtag khz");
1269 jtag_set_speed_khz(khz
);
1274 LOG_DEBUG("have interface set up");
1276 int retval
= jtag
->khz(jtag_get_speed_khz(), &speed_div1
);
1277 if (ERROR_OK
!= retval
)
1279 jtag_set_speed_khz(0);
1282 cur_speed
= speed_div1
;
1284 return jtag_set_speed(cur_speed
);
1287 int jtag_get_speed(void)
1292 int jtag_set_speed(int speed
)
1295 /* this command can be called during CONFIG,
1296 * in which case jtag isn't initialized */
1298 return jtag
? jtag
->speed(speed
) : ERROR_OK
;
1301 int jtag_get_speed_readable(int *speed
)
1303 return jtag
? jtag
->speed_div(jtag_get_speed(), speed
) : ERROR_OK
;
1307 void jtag_set_verify(bool enable
)
1309 jtag_verify
= enable
;
1312 bool jtag_will_verify()
1317 void jtag_set_verify_capture_ir(bool enable
)
1319 jtag_verify_capture_ir
= enable
;
1322 bool jtag_will_verify_capture_ir()
1324 return jtag_verify_capture_ir
;
1327 int jtag_power_dropout(int *dropout
)
1329 return jtag
->power_dropout(dropout
);
1332 int jtag_srst_asserted(int *srst_asserted
)
1334 return jtag
->srst_asserted(srst_asserted
);
1337 enum reset_types
jtag_get_reset_config(void)
1339 return jtag_reset_config
;
1341 void jtag_set_reset_config(enum reset_types type
)
1343 jtag_reset_config
= type
;
1346 int jtag_get_trst(void)
1350 int jtag_get_srst(void)
1355 void jtag_set_nsrst_delay(unsigned delay
)
1357 jtag_nsrst_delay
= delay
;
1359 unsigned jtag_get_nsrst_delay(void)
1361 return jtag_nsrst_delay
;
1363 void jtag_set_ntrst_delay(unsigned delay
)
1365 jtag_ntrst_delay
= delay
;
1367 unsigned jtag_get_ntrst_delay(void)
1369 return jtag_ntrst_delay
;