transport: add transport_is_hla()
[openocd.git] / src / jtag / jtag.h
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2007-2010 √ėyvind Harboe *
6 * oyvind.harboe@zylin.com *
7 * *
8 * This program is free software; you can redistribute it and/or modify *
9 * it under the terms of the GNU General Public License as published by *
10 * the Free Software Foundation; either version 2 of the License, or *
11 * (at your option) any later version. *
12 * *
13 * This program is distributed in the hope that it will be useful, *
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16 * GNU General Public License for more details. *
17 * *
18 * You should have received a copy of the GNU General Public License *
19 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
20 ***************************************************************************/
21
22 #ifndef OPENOCD_JTAG_JTAG_H
23 #define OPENOCD_JTAG_JTAG_H
24
25 #include <helper/binarybuffer.h>
26 #include <helper/log.h>
27
28 #ifdef _DEBUG_JTAG_IO_
29 #define DEBUG_JTAG_IO(expr ...) \
30 do { if (1) LOG_DEBUG(expr); } while (0)
31 #else
32 #define DEBUG_JTAG_IO(expr ...) \
33 do { if (0) LOG_DEBUG(expr); } while (0)
34 #endif
35
36 #ifndef DEBUG_JTAG_IOZ
37 #define DEBUG_JTAG_IOZ 64
38 #endif
39
40 /*-----</Macros>-------------------------------------------------*/
41
42 /**
43 * Defines JTAG Test Access Port states.
44 *
45 * These definitions were gleaned from the ARM7TDMI-S Technical
46 * Reference Manual and validated against several other ARM core
47 * technical manuals.
48 *
49 * FIXME some interfaces require specific numbers be used, as they
50 * are handed-off directly to their hardware implementations.
51 * Fix those drivers to map as appropriate ... then pick some
52 * sane set of numbers here (where 0/uninitialized == INVALID).
53 */
54 typedef enum tap_state {
55 TAP_INVALID = -1,
56
57 #if BUILD_ZY1000
58 /* These are the old numbers. Leave as-is for now... */
59 TAP_RESET = 0, TAP_IDLE = 8,
60 TAP_DRSELECT = 1, TAP_DRCAPTURE = 2, TAP_DRSHIFT = 3, TAP_DREXIT1 = 4,
61 TAP_DRPAUSE = 5, TAP_DREXIT2 = 6, TAP_DRUPDATE = 7,
62 TAP_IRSELECT = 9, TAP_IRCAPTURE = 10, TAP_IRSHIFT = 11, TAP_IREXIT1 = 12,
63 TAP_IRPAUSE = 13, TAP_IREXIT2 = 14, TAP_IRUPDATE = 15,
64
65 #else
66 /* Proper ARM recommended numbers */
67 TAP_DREXIT2 = 0x0,
68 TAP_DREXIT1 = 0x1,
69 TAP_DRSHIFT = 0x2,
70 TAP_DRPAUSE = 0x3,
71 TAP_IRSELECT = 0x4,
72 TAP_DRUPDATE = 0x5,
73 TAP_DRCAPTURE = 0x6,
74 TAP_DRSELECT = 0x7,
75 TAP_IREXIT2 = 0x8,
76 TAP_IREXIT1 = 0x9,
77 TAP_IRSHIFT = 0xa,
78 TAP_IRPAUSE = 0xb,
79 TAP_IDLE = 0xc,
80 TAP_IRUPDATE = 0xd,
81 TAP_IRCAPTURE = 0xe,
82 TAP_RESET = 0x0f,
83
84 #endif
85 } tap_state_t;
86
87 /**
88 * Function tap_state_name
89 * Returns a string suitable for display representing the JTAG tap_state
90 */
91 const char *tap_state_name(tap_state_t state);
92
93 /** Provides user-friendly name lookup of TAP states. */
94 tap_state_t tap_state_by_name(const char *name);
95
96 /** The current TAP state of the pending JTAG command queue. */
97 extern tap_state_t cmd_queue_cur_state;
98
99 /**
100 * This structure defines a single scan field in the scan. It provides
101 * fields for the field's width and pointers to scan input and output
102 * values.
103 *
104 * In addition, this structure includes a value and mask that is used by
105 * jtag_add_dr_scan_check() to validate the value that was scanned out.
106 */
107 struct scan_field {
108 /** The number of bits this field specifies */
109 int num_bits;
110 /** A pointer to value to be scanned into the device */
111 const uint8_t *out_value;
112 /** A pointer to a 32-bit memory location for data scanned out */
113 uint8_t *in_value;
114
115 /** The value used to check the data scanned out. */
116 uint8_t *check_value;
117 /** The mask to go with check_value */
118 uint8_t *check_mask;
119 };
120
121 struct jtag_tap {
122 char *chip;
123 char *tapname;
124 char *dotted_name;
125 int abs_chain_position;
126 /** Is this TAP disabled after JTAG reset? */
127 bool disabled_after_reset;
128 /** Is this TAP currently enabled? */
129 bool enabled;
130 int ir_length; /**< size of instruction register */
131 uint32_t ir_capture_value;
132 uint8_t *expected; /**< Capture-IR expected value */
133 uint32_t ir_capture_mask;
134 uint8_t *expected_mask; /**< Capture-IR expected mask */
135 uint32_t idcode; /**< device identification code */
136 /** not all devices have idcode,
137 * we'll discover this during chain examination */
138 bool hasidcode;
139
140 /** Array of expected identification codes */
141 uint32_t *expected_ids;
142 /** Number of expected identification codes */
143 uint8_t expected_ids_cnt;
144
145 /** Flag saying whether to ignore version field in expected_ids[] */
146 bool ignore_version;
147
148 /** current instruction */
149 uint8_t *cur_instr;
150 /** Bypass register selected */
151 int bypass;
152
153 struct jtag_tap_event_action *event_action;
154
155 struct jtag_tap *next_tap;
156 /* dap instance if some null if no instance , initialized to 0 by calloc*/
157 struct adiv5_dap *dap;
158 /* private pointer to support none-jtag specific functions */
159 void *priv;
160 };
161
162 void jtag_tap_init(struct jtag_tap *tap);
163 void jtag_tap_free(struct jtag_tap *tap);
164
165 struct jtag_tap *jtag_all_taps(void);
166 const char *jtag_tap_name(const struct jtag_tap *tap);
167 struct jtag_tap *jtag_tap_by_string(const char* dotted_name);
168 struct jtag_tap *jtag_tap_by_jim_obj(Jim_Interp* interp, Jim_Obj *obj);
169 struct jtag_tap *jtag_tap_by_position(unsigned abs_position);
170 struct jtag_tap *jtag_tap_next_enabled(struct jtag_tap *p);
171 unsigned jtag_tap_count_enabled(void);
172 unsigned jtag_tap_count(void);
173
174 /*
175 * - TRST_ASSERTED triggers two sets of callbacks, after operations to
176 * reset the scan chain -- via TMS+TCK signaling, or deasserting the
177 * nTRST signal -- are queued:
178 *
179 * + Callbacks in C code fire first, patching internal state
180 * + Then post-reset event scripts fire ... activating JTAG circuits
181 * via TCK cycles, exiting SWD mode via TMS sequences, etc
182 *
183 * During those callbacks, scan chain contents have not been validated.
184 * JTAG operations that address a specific TAP (primarily DR/IR scans)
185 * must *not* be queued.
186 *
187 * - TAP_EVENT_SETUP is reported after TRST_ASSERTED, and after the scan
188 * chain has been validated. JTAG operations including scans that
189 * target specific TAPs may be performed.
190 *
191 * - TAP_EVENT_ENABLE and TAP_EVENT_DISABLE implement TAP activation and
192 * deactivation outside the core using scripted code that understands
193 * the specific JTAG router type. They might be triggered indirectly
194 * from EVENT_SETUP operations.
195 */
196 enum jtag_event {
197 JTAG_TRST_ASSERTED,
198 JTAG_TAP_EVENT_SETUP,
199 JTAG_TAP_EVENT_ENABLE,
200 JTAG_TAP_EVENT_DISABLE,
201 };
202
203 struct jtag_tap_event_action {
204 /** The event for which this action will be triggered. */
205 enum jtag_event event;
206 /** The interpreter to use for evaluating the @c body. */
207 Jim_Interp *interp;
208 /** Contains a script to 'eval' when the @c event is triggered. */
209 Jim_Obj *body;
210 /* next action in linked list */
211 struct jtag_tap_event_action *next;
212 };
213
214 /**
215 * Defines the function signature requide for JTAG event callback
216 * functions, which are added with jtag_register_event_callback()
217 * and removed jtag_unregister_event_callback().
218 * @param event The event to handle.
219 * @param prive A pointer to data that was passed to
220 * jtag_register_event_callback().
221 * @returns Must return ERROR_OK on success, or an error code on failure.
222 *
223 * @todo Change to return void or define a use for its return code.
224 */
225 typedef int (*jtag_event_handler_t)(enum jtag_event event, void *priv);
226
227 int jtag_register_event_callback(jtag_event_handler_t f, void *x);
228 int jtag_unregister_event_callback(jtag_event_handler_t f, void *x);
229
230 int jtag_call_event_callbacks(enum jtag_event event);
231
232
233 /** @returns The current JTAG speed setting. */
234 int jtag_get_speed(int *speed);
235
236 /**
237 * Given a @a speed setting, use the interface @c speed_div callback to
238 * adjust the setting.
239 * @param speed The speed setting to convert back to readable KHz.
240 * @returns ERROR_OK if the interface has not been initialized or on success;
241 * otherwise, the error code produced by the @c speed_div callback.
242 */
243 int jtag_get_speed_readable(int *speed);
244
245 /** Attempt to configure the interface for the specified KHz. */
246 int jtag_config_khz(unsigned khz);
247
248 /**
249 * Attempt to enable RTCK/RCLK. If that fails, fallback to the
250 * specified frequency.
251 */
252 int jtag_config_rclk(unsigned fallback_speed_khz);
253
254 /** Retreives the clock speed of the JTAG interface in KHz. */
255 unsigned jtag_get_speed_khz(void);
256
257 enum reset_types {
258 RESET_NONE = 0x0,
259 RESET_HAS_TRST = 0x1,
260 RESET_HAS_SRST = 0x2,
261 RESET_TRST_AND_SRST = 0x3,
262 RESET_SRST_PULLS_TRST = 0x4,
263 RESET_TRST_PULLS_SRST = 0x8,
264 RESET_TRST_OPEN_DRAIN = 0x10,
265 RESET_SRST_PUSH_PULL = 0x20,
266 RESET_SRST_NO_GATING = 0x40,
267 RESET_CNCT_UNDER_SRST = 0x80
268 };
269
270 enum reset_types jtag_get_reset_config(void);
271 void jtag_set_reset_config(enum reset_types type);
272
273 void jtag_set_nsrst_delay(unsigned delay);
274 unsigned jtag_get_nsrst_delay(void);
275
276 void jtag_set_ntrst_delay(unsigned delay);
277 unsigned jtag_get_ntrst_delay(void);
278
279 void jtag_set_nsrst_assert_width(unsigned delay);
280 unsigned jtag_get_nsrst_assert_width(void);
281
282 void jtag_set_ntrst_assert_width(unsigned delay);
283 unsigned jtag_get_ntrst_assert_width(void);
284
285 /** @returns The current state of TRST. */
286 int jtag_get_trst(void);
287 /** @returns The current state of SRST. */
288 int jtag_get_srst(void);
289
290 /** Enable or disable data scan verification checking. */
291 void jtag_set_verify(bool enable);
292 /** @returns True if data scan verification will be performed. */
293 bool jtag_will_verify(void);
294
295 /** Enable or disable verification of IR scan checking. */
296 void jtag_set_verify_capture_ir(bool enable);
297 /** @returns True if IR scan verification will be performed. */
298 bool jtag_will_verify_capture_ir(void);
299
300 /** Initialize debug adapter upon startup. */
301 int adapter_init(struct command_context *cmd_ctx);
302
303 /** Shutdown the debug adapter upon program exit. */
304 int adapter_quit(void);
305
306 /** Set ms to sleep after jtag_execute_queue() flushes queue. Debug purposes. */
307 void jtag_set_flush_queue_sleep(int ms);
308
309 /**
310 * Initialize JTAG chain using only a RESET reset. If init fails,
311 * try reset + init.
312 */
313 int jtag_init(struct command_context *cmd_ctx);
314
315 /** reset, then initialize JTAG chain */
316 int jtag_init_reset(struct command_context *cmd_ctx);
317 int jtag_register_commands(struct command_context *cmd_ctx);
318 int jtag_init_inner(struct command_context *cmd_ctx);
319
320 /**
321 * @file
322 * The JTAG interface can be implemented with a software or hardware fifo.
323 *
324 * TAP_DRSHIFT and TAP_IRSHIFT are illegal end states; however,
325 * TAP_DRSHIFT/IRSHIFT can be emulated as end states, by using longer
326 * scans.
327 *
328 * Code that is relatively insensitive to the path taken through state
329 * machine (as long as it is JTAG compliant) can use @a endstate for
330 * jtag_add_xxx_scan(). Otherwise, the pause state must be specified as
331 * end state and a subsequent jtag_add_pathmove() must be issued.
332 */
333
334 /**
335 * Generate an IR SCAN with a list of scan fields with one entry for
336 * each enabled TAP.
337 *
338 * If the input field list contains an instruction value for a TAP then
339 * that is used otherwise the TAP is set to bypass.
340 *
341 * TAPs for which no fields are passed are marked as bypassed for
342 * subsequent DR SCANs.
343 *
344 */
345 void jtag_add_ir_scan(struct jtag_tap *tap,
346 struct scan_field *fields, tap_state_t endstate);
347 /**
348 * The same as jtag_add_ir_scan except no verification is performed out
349 * the output values.
350 */
351 void jtag_add_ir_scan_noverify(struct jtag_tap *tap,
352 const struct scan_field *fields, tap_state_t state);
353 /**
354 * Scan out the bits in ir scan mode.
355 *
356 * If in_bits == NULL, discard incoming bits.
357 */
358 void jtag_add_plain_ir_scan(int num_bits, const uint8_t *out_bits, uint8_t *in_bits,
359 tap_state_t endstate);
360
361 /**
362 * Generate a DR SCAN using the fields passed to the function.
363 * For connected TAPs, the function checks in_fields and uses fields
364 * specified there. For bypassed TAPs, the function generates a dummy
365 * 1-bit field. The bypass status of TAPs is set by jtag_add_ir_scan().
366 */
367 void jtag_add_dr_scan(struct jtag_tap *tap, int num_fields,
368 const struct scan_field *fields, tap_state_t endstate);
369 /** A version of jtag_add_dr_scan() that uses the check_value/mask fields */
370 void jtag_add_dr_scan_check(struct jtag_tap *tap, int num_fields,
371 struct scan_field *fields, tap_state_t endstate);
372 /**
373 * Scan out the bits in ir scan mode.
374 *
375 * If in_bits == NULL, discard incoming bits.
376 */
377 void jtag_add_plain_dr_scan(int num_bits,
378 const uint8_t *out_bits, uint8_t *in_bits, tap_state_t endstate);
379
380 /**
381 * Defines the type of data passed to the jtag_callback_t interface.
382 * The underlying type must allow storing an @c int or pointer type.
383 */
384 typedef intptr_t jtag_callback_data_t;
385
386 /**
387 * Defines a simple JTAG callback that can allow conversions on data
388 * scanned in from an interface.
389 *
390 * This callback should only be used for conversion that cannot fail.
391 * For conversion types or checks that can fail, use the more complete
392 * variant: jtag_callback_t.
393 */
394 typedef void (*jtag_callback1_t)(jtag_callback_data_t data0);
395
396 /** A simpler version of jtag_add_callback4(). */
397 void jtag_add_callback(jtag_callback1_t, jtag_callback_data_t data0);
398
399
400 /**
401 * Defines the interface of the JTAG callback mechanism. Such
402 * callbacks can be executed once the queue has been flushed.
403 *
404 * The JTAG queue can be executed synchronously or asynchronously.
405 * Typically for USB, the queue is executed asynchronously. For
406 * low-latency interfaces, the queue may be executed synchronously.
407 *
408 * The callback mechanism is very general and does not make many
409 * assumptions about what the callback does or what its arguments are.
410 * These callbacks are typically executed *after* the *entire* JTAG
411 * queue has been executed for e.g. USB interfaces, and they are
412 * guaranteeed to be invoked in the order that they were queued.
413 *
414 * If the execution of the queue fails before the callbacks, then --
415 * depending on driver implementation -- the callbacks may or may not be
416 * invoked.
417 *
418 * @todo Make that behavior consistent.
419 *
420 * @param data0 Typically used to point to the data to operate on.
421 * Frequently this will be the data clocked in during a shift operation.
422 * @param data1 An integer big enough to use as an @c int or a pointer.
423 * @param data2 An integer big enough to use as an @c int or a pointer.
424 * @param data3 An integer big enough to use as an @c int or a pointer.
425 * @returns an error code
426 */
427 typedef int (*jtag_callback_t)(jtag_callback_data_t data0,
428 jtag_callback_data_t data1,
429 jtag_callback_data_t data2,
430 jtag_callback_data_t data3);
431
432 /**
433 * Run a TAP_RESET reset where the end state is TAP_RESET,
434 * regardless of the start state.
435 */
436 void jtag_add_tlr(void);
437
438 /**
439 * Application code *must* assume that interfaces will
440 * implement transitions between states with different
441 * paths and path lengths through the state diagram. The
442 * path will vary across interface and also across versions
443 * of the same interface over time. Even if the OpenOCD code
444 * is unchanged, the actual path taken may vary over time
445 * and versions of interface firmware or PCB revisions.
446 *
447 * Use jtag_add_pathmove() when specific transition sequences
448 * are required.
449 *
450 * Do not use jtag_add_pathmove() unless you need to, but do use it
451 * if you have to.
452 *
453 * DANGER! If the target is dependent upon a particular sequence
454 * of transitions for things to work correctly(e.g. as a workaround
455 * for an errata that contradicts the JTAG standard), then pathmove
456 * must be used, even if some jtag interfaces happen to use the
457 * desired path. Worse, the jtag interface used for testing a
458 * particular implementation, could happen to use the "desired"
459 * path when transitioning to/from end
460 * state.
461 *
462 * A list of unambigious single clock state transitions, not
463 * all drivers can support this, but it is required for e.g.
464 * XScale and Xilinx support
465 *
466 * Note! TAP_RESET must not be used in the path!
467 *
468 * Note that the first on the list must be reachable
469 * via a single transition from the current state.
470 *
471 * All drivers are required to implement jtag_add_pathmove().
472 * However, if the pathmove sequence can not be precisely
473 * executed, an interface_jtag_add_pathmove() or jtag_execute_queue()
474 * must return an error. It is legal, but not recommended, that
475 * a driver returns an error in all cases for a pathmove if it
476 * can only implement a few transitions and therefore
477 * a partial implementation of pathmove would have little practical
478 * application.
479 *
480 * If an error occurs, jtag_error will contain one of these error codes:
481 * - ERROR_JTAG_NOT_STABLE_STATE -- The final state was not stable.
482 * - ERROR_JTAG_STATE_INVALID -- The path passed through TAP_RESET.
483 * - ERROR_JTAG_TRANSITION_INVALID -- The path includes invalid
484 * state transitions.
485 */
486 void jtag_add_pathmove(int num_states, const tap_state_t *path);
487
488 /**
489 * jtag_add_statemove() moves from the current state to @a goal_state.
490 *
491 * @param goal_state The final TAP state.
492 * @return ERROR_OK on success, or an error code on failure.
493 *
494 * Moves from the current state to the goal \a state.
495 * Both states must be stable.
496 */
497 int jtag_add_statemove(tap_state_t goal_state);
498
499 /**
500 * Goes to TAP_IDLE (if we're not already there), cycle
501 * precisely num_cycles in the TAP_IDLE state, after which move
502 * to @a endstate (unless it is also TAP_IDLE).
503 *
504 * @param num_cycles Number of cycles in TAP_IDLE state. This argument
505 * may be 0, in which case this routine will navigate to @a endstate
506 * via TAP_IDLE.
507 * @param endstate The final state.
508 */
509 void jtag_add_runtest(int num_cycles, tap_state_t endstate);
510
511 /**
512 * A reset of the TAP state machine can be requested.
513 *
514 * Whether tms or trst reset is used depends on the capabilities of
515 * the target and jtag interface(reset_config command configures this).
516 *
517 * srst can driver a reset of the TAP state machine and vice
518 * versa
519 *
520 * Application code may need to examine value of jtag_reset_config
521 * to determine the proper codepath
522 *
523 * DANGER! Even though srst drives trst, trst might not be connected to
524 * the interface, and it might actually be *harmful* to assert trst in this case.
525 *
526 * This is why combinations such as "reset_config srst_only srst_pulls_trst"
527 * are supported.
528 *
529 * only req_tlr_or_trst and srst can have a transition for a
530 * call as the effects of transitioning both at the "same time"
531 * are undefined, but when srst_pulls_trst or vice versa,
532 * then trst & srst *must* be asserted together.
533 */
534 void jtag_add_reset(int req_tlr_or_trst, int srst);
535
536 void jtag_add_sleep(uint32_t us);
537
538 int jtag_add_tms_seq(unsigned nbits, const uint8_t *seq, enum tap_state t);
539
540 /**
541 * Function jtag_add_clocks
542 * first checks that the state in which the clocks are to be issued is
543 * stable, then queues up num_cycles clocks for transmission.
544 */
545 void jtag_add_clocks(int num_cycles);
546
547 /**
548 * For software FIFO implementations, the queued commands can be executed
549 * during this call or earlier. A sw queue might decide to push out
550 * some of the jtag_add_xxx() operations once the queue is "big enough".
551 *
552 * This fn will return an error code if any of the prior jtag_add_xxx()
553 * calls caused a failure, e.g. check failure. Note that it does not
554 * matter if the operation was executed *before* jtag_execute_queue(),
555 * jtag_execute_queue() will still return an error code.
556 *
557 * All jtag_add_xxx() calls that have in_handler != NULL will have been
558 * executed when this fn returns, but if what has been queued only
559 * clocks data out, without reading anything back, then JTAG could
560 * be running *after* jtag_execute_queue() returns. The API does
561 * not define a way to flush a hw FIFO that runs *after*
562 * jtag_execute_queue() returns.
563 *
564 * jtag_add_xxx() commands can either be executed immediately or
565 * at some time between the jtag_add_xxx() fn call and jtag_execute_queue().
566 */
567 int jtag_execute_queue(void);
568
569 /** same as jtag_execute_queue() but does not clear the error flag */
570 void jtag_execute_queue_noclear(void);
571
572 /** @returns the number of times the scan queue has been flushed */
573 int jtag_get_flush_queue_count(void);
574
575 /** Report Tcl event to all TAPs */
576 void jtag_notify_event(enum jtag_event);
577
578 /* can be implemented by hw + sw */
579 int jtag_power_dropout(int *dropout);
580 int jtag_srst_asserted(int *srst_asserted);
581
582 /* JTAG support functions */
583
584 /**
585 * Execute jtag queue and check value with an optional mask.
586 * @param field Pointer to scan field.
587 * @param value Pointer to scan value.
588 * @param mask Pointer to scan mask; may be NULL.
589 * @returns Nothing, but calls jtag_set_error() on any error.
590 */
591 void jtag_check_value_mask(struct scan_field *field, uint8_t *value, uint8_t *mask);
592
593 void jtag_sleep(uint32_t us);
594
595 /*
596 * The JTAG subsystem defines a number of error codes,
597 * using codes between -100 and -199.
598 */
599 #define ERROR_JTAG_INIT_FAILED (-100)
600 #define ERROR_JTAG_INVALID_INTERFACE (-101)
601 #define ERROR_JTAG_NOT_IMPLEMENTED (-102)
602 #define ERROR_JTAG_TRST_ASSERTED (-103)
603 #define ERROR_JTAG_QUEUE_FAILED (-104)
604 #define ERROR_JTAG_NOT_STABLE_STATE (-105)
605 #define ERROR_JTAG_DEVICE_ERROR (-107)
606 #define ERROR_JTAG_STATE_INVALID (-108)
607 #define ERROR_JTAG_TRANSITION_INVALID (-109)
608 #define ERROR_JTAG_INIT_SOFT_FAIL (-110)
609
610 /**
611 * Set the current JTAG core execution error, unless one was set
612 * by a previous call previously. Driver or application code must
613 * use jtag_error_clear to reset jtag_error once this routine has been
614 * called with a non-zero error code.
615 */
616 void jtag_set_error(int error);
617 /**
618 * Resets jtag_error to ERROR_OK, returning its previous value.
619 * @returns The previous value of @c jtag_error.
620 */
621 int jtag_error_clear(void);
622
623 /**
624 * Return true if it's safe for a background polling task to access the
625 * JTAG scan chain. Polling may be explicitly disallowed, and is also
626 * unsafe while nTRST is active or the JTAG clock is gated off.
627 */
628 bool is_jtag_poll_safe(void);
629
630 /**
631 * Return flag reporting whether JTAG polling is disallowed.
632 */
633 bool jtag_poll_get_enabled(void);
634
635 /**
636 * Assign flag reporting whether JTAG polling is disallowed.
637 */
638 void jtag_poll_set_enabled(bool value);
639
640
641 /* The minidriver may have inline versions of some of the low
642 * level APIs that are used in inner loops. */
643 #include <jtag/minidriver.h>
644
645 int jim_jtag_newtap(Jim_Interp *interp, int argc, Jim_Obj *const *argv);
646
647 #endif /* OPENOCD_JTAG_JTAG_H */

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