Fix comment that limits num_bits to 32.
[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, write to the *
20 * Free Software Foundation, Inc., *
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
22 ***************************************************************************/
23
24 #ifndef JTAG_H
25 #define JTAG_H
26
27 #include <helper/binarybuffer.h>
28 #include <helper/log.h>
29
30 #ifdef _DEBUG_JTAG_IO_
31 #define DEBUG_JTAG_IO(expr ...) \
32 do { if (1) LOG_DEBUG(expr); } while (0)
33 #else
34 #define DEBUG_JTAG_IO(expr ...) \
35 do { if (0) LOG_DEBUG(expr); } while (0)
36 #endif
37
38 #ifndef DEBUG_JTAG_IOZ
39 #define DEBUG_JTAG_IOZ 64
40 #endif
41
42 /*-----</Macros>-------------------------------------------------*/
43
44 /**
45 * Defines JTAG Test Access Port states.
46 *
47 * These definitions were gleaned from the ARM7TDMI-S Technical
48 * Reference Manual and validated against several other ARM core
49 * technical manuals.
50 *
51 * FIXME some interfaces require specific numbers be used, as they
52 * are handed-off directly to their hardware implementations.
53 * Fix those drivers to map as appropriate ... then pick some
54 * sane set of numbers here (where 0/uninitialized == INVALID).
55 */
56 typedef enum tap_state {
57 TAP_INVALID = -1,
58
59 #if BUILD_ZY1000
60 /* These are the old numbers. Leave as-is for now... */
61 TAP_RESET = 0, TAP_IDLE = 8,
62 TAP_DRSELECT = 1, TAP_DRCAPTURE = 2, TAP_DRSHIFT = 3, TAP_DREXIT1 = 4,
63 TAP_DRPAUSE = 5, TAP_DREXIT2 = 6, TAP_DRUPDATE = 7,
64 TAP_IRSELECT = 9, TAP_IRCAPTURE = 10, TAP_IRSHIFT = 11, TAP_IREXIT1 = 12,
65 TAP_IRPAUSE = 13, TAP_IREXIT2 = 14, TAP_IRUPDATE = 15,
66
67 #else
68 /* Proper ARM recommended numbers */
69 TAP_DREXIT2 = 0x0,
70 TAP_DREXIT1 = 0x1,
71 TAP_DRSHIFT = 0x2,
72 TAP_DRPAUSE = 0x3,
73 TAP_IRSELECT = 0x4,
74 TAP_DRUPDATE = 0x5,
75 TAP_DRCAPTURE = 0x6,
76 TAP_DRSELECT = 0x7,
77 TAP_IREXIT2 = 0x8,
78 TAP_IREXIT1 = 0x9,
79 TAP_IRSHIFT = 0xa,
80 TAP_IRPAUSE = 0xb,
81 TAP_IDLE = 0xc,
82 TAP_IRUPDATE = 0xd,
83 TAP_IRCAPTURE = 0xe,
84 TAP_RESET = 0x0f,
85
86 #endif
87 } tap_state_t;
88
89 /**
90 * Function tap_state_name
91 * Returns a string suitable for display representing the JTAG tap_state
92 */
93 const char *tap_state_name(tap_state_t state);
94
95 /** Provides user-friendly name lookup of TAP states. */
96 tap_state_t tap_state_by_name(const char *name);
97
98 /** The current TAP state of the pending JTAG command queue. */
99 extern tap_state_t cmd_queue_cur_state;
100
101 /**
102 * This structure defines a single scan field in the scan. It provides
103 * fields for the field's width and pointers to scan input and output
104 * values.
105 *
106 * In addition, this structure includes a value and mask that is used by
107 * jtag_add_dr_scan_check() to validate the value that was scanned out.
108 */
109 struct scan_field {
110 /** The number of bits this field specifies */
111 int num_bits;
112 /** A pointer to value to be scanned into the device */
113 const uint8_t *out_value;
114 /** A pointer to a 32-bit memory location for data scanned out */
115 uint8_t *in_value;
116
117 /** The value used to check the data scanned out. */
118 uint8_t *check_value;
119 /** The mask to go with check_value */
120 uint8_t *check_mask;
121 };
122
123 struct jtag_tap {
124 char *chip;
125 char *tapname;
126 char *dotted_name;
127 int abs_chain_position;
128 /** Is this TAP disabled after JTAG reset? */
129 bool disabled_after_reset;
130 /** Is this TAP currently enabled? */
131 bool enabled;
132 int ir_length; /**< size of instruction register */
133 uint32_t ir_capture_value;
134 uint8_t *expected; /**< Capture-IR expected value */
135 uint32_t ir_capture_mask;
136 uint8_t *expected_mask; /**< Capture-IR expected mask */
137 uint32_t idcode; /**< device identification code */
138 /** not all devices have idcode,
139 * we'll discover this during chain examination */
140 bool hasidcode;
141
142 /** Array of expected identification codes */
143 uint32_t *expected_ids;
144 /** Number of expected identification codes */
145 uint8_t expected_ids_cnt;
146
147 /** Flag saying whether to ignore version field in expected_ids[] */
148 bool ignore_version;
149
150 /** current instruction */
151 uint8_t *cur_instr;
152 /** Bypass register selected */
153 int bypass;
154
155 struct jtag_tap_event_action *event_action;
156
157 struct jtag_tap *next_tap;
158 /* dap instance if some null if no instance , initialized to 0 by calloc*/
159 struct adiv5_dap *dap;
160 /* private pointer to support none-jtag specific functions */
161 void *priv;
162 };
163
164 void jtag_tap_init(struct jtag_tap *tap);
165 void jtag_tap_free(struct jtag_tap *tap);
166
167 struct jtag_tap *jtag_all_taps(void);
168 const char *jtag_tap_name(const struct jtag_tap *tap);
169 struct jtag_tap *jtag_tap_by_string(const char* dotted_name);
170 struct jtag_tap *jtag_tap_by_jim_obj(Jim_Interp* interp, Jim_Obj *obj);
171 struct jtag_tap *jtag_tap_by_position(unsigned abs_position);
172 struct jtag_tap *jtag_tap_next_enabled(struct jtag_tap *p);
173 unsigned jtag_tap_count_enabled(void);
174 unsigned jtag_tap_count(void);
175
176 /*
177 * - TRST_ASSERTED triggers two sets of callbacks, after operations to
178 * reset the scan chain -- via TMS+TCK signaling, or deasserting the
179 * nTRST signal -- are queued:
180 *
181 * + Callbacks in C code fire first, patching internal state
182 * + Then post-reset event scripts fire ... activating JTAG circuits
183 * via TCK cycles, exiting SWD mode via TMS sequences, etc
184 *
185 * During those callbacks, scan chain contents have not been validated.
186 * JTAG operations that address a specific TAP (primarily DR/IR scans)
187 * must *not* be queued.
188 *
189 * - TAP_EVENT_SETUP is reported after TRST_ASSERTED, and after the scan
190 * chain has been validated. JTAG operations including scans that
191 * target specific TAPs may be performed.
192 *
193 * - TAP_EVENT_ENABLE and TAP_EVENT_DISABLE implement TAP activation and
194 * deactivation outside the core using scripted code that understands
195 * the specific JTAG router type. They might be triggered indirectly
196 * from EVENT_SETUP operations.
197 */
198 enum jtag_event {
199 JTAG_TRST_ASSERTED,
200 JTAG_TAP_EVENT_SETUP,
201 JTAG_TAP_EVENT_ENABLE,
202 JTAG_TAP_EVENT_DISABLE,
203 };
204
205 struct jtag_tap_event_action {
206 /** The event for which this action will be triggered. */
207 enum jtag_event event;
208 /** The interpreter to use for evaluating the @c body. */
209 Jim_Interp *interp;
210 /** Contains a script to 'eval' when the @c event is triggered. */
211 Jim_Obj *body;
212 /* next action in linked list */
213 struct jtag_tap_event_action *next;
214 };
215
216 /**
217 * Defines the function signature requide for JTAG event callback
218 * functions, which are added with jtag_register_event_callback()
219 * and removed jtag_unregister_event_callback().
220 * @param event The event to handle.
221 * @param prive A pointer to data that was passed to
222 * jtag_register_event_callback().
223 * @returns Must return ERROR_OK on success, or an error code on failure.
224 *
225 * @todo Change to return void or define a use for its return code.
226 */
227 typedef int (*jtag_event_handler_t)(enum jtag_event event, void *priv);
228
229 int jtag_register_event_callback(jtag_event_handler_t f, void *x);
230 int jtag_unregister_event_callback(jtag_event_handler_t f, void *x);
231
232 int jtag_call_event_callbacks(enum jtag_event event);
233
234
235 /** @returns The current JTAG speed setting. */
236 int jtag_get_speed(int *speed);
237
238 /**
239 * Given a @a speed setting, use the interface @c speed_div callback to
240 * adjust the setting.
241 * @param speed The speed setting to convert back to readable KHz.
242 * @returns ERROR_OK if the interface has not been initialized or on success;
243 * otherwise, the error code produced by the @c speed_div callback.
244 */
245 int jtag_get_speed_readable(int *speed);
246
247 /** Attempt to configure the interface for the specified KHz. */
248 int jtag_config_khz(unsigned khz);
249
250 /**
251 * Attempt to enable RTCK/RCLK. If that fails, fallback to the
252 * specified frequency.
253 */
254 int jtag_config_rclk(unsigned fallback_speed_khz);
255
256 /** Retreives the clock speed of the JTAG interface in KHz. */
257 unsigned jtag_get_speed_khz(void);
258
259 enum reset_types {
260 RESET_NONE = 0x0,
261 RESET_HAS_TRST = 0x1,
262 RESET_HAS_SRST = 0x2,
263 RESET_TRST_AND_SRST = 0x3,
264 RESET_SRST_PULLS_TRST = 0x4,
265 RESET_TRST_PULLS_SRST = 0x8,
266 RESET_TRST_OPEN_DRAIN = 0x10,
267 RESET_SRST_PUSH_PULL = 0x20,
268 RESET_SRST_NO_GATING = 0x40,
269 RESET_CNCT_UNDER_SRST = 0x80
270 };
271
272 enum reset_types jtag_get_reset_config(void);
273 void jtag_set_reset_config(enum reset_types type);
274
275 void jtag_set_nsrst_delay(unsigned delay);
276 unsigned jtag_get_nsrst_delay(void);
277
278 void jtag_set_ntrst_delay(unsigned delay);
279 unsigned jtag_get_ntrst_delay(void);
280
281 void jtag_set_nsrst_assert_width(unsigned delay);
282 unsigned jtag_get_nsrst_assert_width(void);
283
284 void jtag_set_ntrst_assert_width(unsigned delay);
285 unsigned jtag_get_ntrst_assert_width(void);
286
287 /** @returns The current state of TRST. */
288 int jtag_get_trst(void);
289 /** @returns The current state of SRST. */
290 int jtag_get_srst(void);
291
292 /** Enable or disable data scan verification checking. */
293 void jtag_set_verify(bool enable);
294 /** @returns True if data scan verification will be performed. */
295 bool jtag_will_verify(void);
296
297 /** Enable or disable verification of IR scan checking. */
298 void jtag_set_verify_capture_ir(bool enable);
299 /** @returns True if IR scan verification will be performed. */
300 bool jtag_will_verify_capture_ir(void);
301
302 /** Initialize debug adapter upon startup. */
303 int adapter_init(struct command_context *cmd_ctx);
304
305 /** Shutdown the debug adapter upon program exit. */
306 int adapter_quit(void);
307
308 /** Set ms to sleep after jtag_execute_queue() flushes queue. Debug purposes. */
309 void jtag_set_flush_queue_sleep(int ms);
310
311 /**
312 * Initialize JTAG chain using only a RESET reset. If init fails,
313 * try reset + init.
314 */
315 int jtag_init(struct command_context *cmd_ctx);
316
317 /** reset, then initialize JTAG chain */
318 int jtag_init_reset(struct command_context *cmd_ctx);
319 int jtag_register_commands(struct command_context *cmd_ctx);
320 int jtag_init_inner(struct command_context *cmd_ctx);
321
322 /**
323 * @file
324 * The JTAG interface can be implemented with a software or hardware fifo.
325 *
326 * TAP_DRSHIFT and TAP_IRSHIFT are illegal end states; however,
327 * TAP_DRSHIFT/IRSHIFT can be emulated as end states, by using longer
328 * scans.
329 *
330 * Code that is relatively insensitive to the path taken through state
331 * machine (as long as it is JTAG compliant) can use @a endstate for
332 * jtag_add_xxx_scan(). Otherwise, the pause state must be specified as
333 * end state and a subsequent jtag_add_pathmove() must be issued.
334 */
335
336 /**
337 * Generate an IR SCAN with a list of scan fields with one entry for
338 * each enabled TAP.
339 *
340 * If the input field list contains an instruction value for a TAP then
341 * that is used otherwise the TAP is set to bypass.
342 *
343 * TAPs for which no fields are passed are marked as bypassed for
344 * subsequent DR SCANs.
345 *
346 */
347 void jtag_add_ir_scan(struct jtag_tap *tap,
348 struct scan_field *fields, tap_state_t endstate);
349 /**
350 * The same as jtag_add_ir_scan except no verification is performed out
351 * the output values.
352 */
353 void jtag_add_ir_scan_noverify(struct jtag_tap *tap,
354 const struct scan_field *fields, tap_state_t state);
355 /**
356 * Scan out the bits in ir scan mode.
357 *
358 * If in_bits == NULL, discard incoming bits.
359 */
360 void jtag_add_plain_ir_scan(int num_bits, const uint8_t *out_bits, uint8_t *in_bits,
361 tap_state_t endstate);
362
363 /**
364 * Generate a DR SCAN using the fields passed to the function.
365 * For connected TAPs, the function checks in_fields and uses fields
366 * specified there. For bypassed TAPs, the function generates a dummy
367 * 1-bit field. The bypass status of TAPs is set by jtag_add_ir_scan().
368 */
369 void jtag_add_dr_scan(struct jtag_tap *tap, int num_fields,
370 const struct scan_field *fields, tap_state_t endstate);
371 /** A version of jtag_add_dr_scan() that uses the check_value/mask fields */
372 void jtag_add_dr_scan_check(struct jtag_tap *tap, int num_fields,
373 struct scan_field *fields, tap_state_t endstate);
374 /**
375 * Scan out the bits in ir scan mode.
376 *
377 * If in_bits == NULL, discard incoming bits.
378 */
379 void jtag_add_plain_dr_scan(int num_bits,
380 const uint8_t *out_bits, uint8_t *in_bits, tap_state_t endstate);
381
382 /**
383 * Defines the type of data passed to the jtag_callback_t interface.
384 * The underlying type must allow storing an @c int or pointer type.
385 */
386 typedef intptr_t jtag_callback_data_t;
387
388 /**
389 * Defines a simple JTAG callback that can allow conversions on data
390 * scanned in from an interface.
391 *
392 * This callback should only be used for conversion that cannot fail.
393 * For conversion types or checks that can fail, use the more complete
394 * variant: jtag_callback_t.
395 */
396 typedef void (*jtag_callback1_t)(jtag_callback_data_t data0);
397
398 /** A simpler version of jtag_add_callback4(). */
399 void jtag_add_callback(jtag_callback1_t, jtag_callback_data_t data0);
400
401
402 /**
403 * Defines the interface of the JTAG callback mechanism. Such
404 * callbacks can be executed once the queue has been flushed.
405 *
406 * The JTAG queue can be executed synchronously or asynchronously.
407 * Typically for USB, the queue is executed asynchronously. For
408 * low-latency interfaces, the queue may be executed synchronously.
409 *
410 * The callback mechanism is very general and does not make many
411 * assumptions about what the callback does or what its arguments are.
412 * These callbacks are typically executed *after* the *entire* JTAG
413 * queue has been executed for e.g. USB interfaces, and they are
414 * guaranteeed to be invoked in the order that they were queued.
415 *
416 * If the execution of the queue fails before the callbacks, then --
417 * depending on driver implementation -- the callbacks may or may not be
418 * invoked.
419 *
420 * @todo Make that behavior consistent.
421 *
422 * @param data0 Typically used to point to the data to operate on.
423 * Frequently this will be the data clocked in during a shift operation.
424 * @param data1 An integer big enough to use as an @c int or a pointer.
425 * @param data2 An integer big enough to use as an @c int or a pointer.
426 * @param data3 An integer big enough to use as an @c int or a pointer.
427 * @returns an error code
428 */
429 typedef int (*jtag_callback_t)(jtag_callback_data_t data0,
430 jtag_callback_data_t data1,
431 jtag_callback_data_t data2,
432 jtag_callback_data_t data3);
433
434 /**
435 * Run a TAP_RESET reset where the end state is TAP_RESET,
436 * regardless of the start state.
437 */
438 void jtag_add_tlr(void);
439
440 /**
441 * Application code *must* assume that interfaces will
442 * implement transitions between states with different
443 * paths and path lengths through the state diagram. The
444 * path will vary across interface and also across versions
445 * of the same interface over time. Even if the OpenOCD code
446 * is unchanged, the actual path taken may vary over time
447 * and versions of interface firmware or PCB revisions.
448 *
449 * Use jtag_add_pathmove() when specific transition sequences
450 * are required.
451 *
452 * Do not use jtag_add_pathmove() unless you need to, but do use it
453 * if you have to.
454 *
455 * DANGER! If the target is dependent upon a particular sequence
456 * of transitions for things to work correctly(e.g. as a workaround
457 * for an errata that contradicts the JTAG standard), then pathmove
458 * must be used, even if some jtag interfaces happen to use the
459 * desired path. Worse, the jtag interface used for testing a
460 * particular implementation, could happen to use the "desired"
461 * path when transitioning to/from end
462 * state.
463 *
464 * A list of unambigious single clock state transitions, not
465 * all drivers can support this, but it is required for e.g.
466 * XScale and Xilinx support
467 *
468 * Note! TAP_RESET must not be used in the path!
469 *
470 * Note that the first on the list must be reachable
471 * via a single transition from the current state.
472 *
473 * All drivers are required to implement jtag_add_pathmove().
474 * However, if the pathmove sequence can not be precisely
475 * executed, an interface_jtag_add_pathmove() or jtag_execute_queue()
476 * must return an error. It is legal, but not recommended, that
477 * a driver returns an error in all cases for a pathmove if it
478 * can only implement a few transitions and therefore
479 * a partial implementation of pathmove would have little practical
480 * application.
481 *
482 * If an error occurs, jtag_error will contain one of these error codes:
483 * - ERROR_JTAG_NOT_STABLE_STATE -- The final state was not stable.
484 * - ERROR_JTAG_STATE_INVALID -- The path passed through TAP_RESET.
485 * - ERROR_JTAG_TRANSITION_INVALID -- The path includes invalid
486 * state transitions.
487 */
488 void jtag_add_pathmove(int num_states, const tap_state_t *path);
489
490 /**
491 * jtag_add_statemove() moves from the current state to @a goal_state.
492 *
493 * @param goal_state The final TAP state.
494 * @return ERROR_OK on success, or an error code on failure.
495 *
496 * Moves from the current state to the goal \a state.
497 * Both states must be stable.
498 */
499 int jtag_add_statemove(tap_state_t goal_state);
500
501 /**
502 * Goes to TAP_IDLE (if we're not already there), cycle
503 * precisely num_cycles in the TAP_IDLE state, after which move
504 * to @a endstate (unless it is also TAP_IDLE).
505 *
506 * @param num_cycles Number of cycles in TAP_IDLE state. This argument
507 * may be 0, in which case this routine will navigate to @a endstate
508 * via TAP_IDLE.
509 * @param endstate The final state.
510 */
511 void jtag_add_runtest(int num_cycles, tap_state_t endstate);
512
513 /**
514 * A reset of the TAP state machine can be requested.
515 *
516 * Whether tms or trst reset is used depends on the capabilities of
517 * the target and jtag interface(reset_config command configures this).
518 *
519 * srst can driver a reset of the TAP state machine and vice
520 * versa
521 *
522 * Application code may need to examine value of jtag_reset_config
523 * to determine the proper codepath
524 *
525 * DANGER! Even though srst drives trst, trst might not be connected to
526 * the interface, and it might actually be *harmful* to assert trst in this case.
527 *
528 * This is why combinations such as "reset_config srst_only srst_pulls_trst"
529 * are supported.
530 *
531 * only req_tlr_or_trst and srst can have a transition for a
532 * call as the effects of transitioning both at the "same time"
533 * are undefined, but when srst_pulls_trst or vice versa,
534 * then trst & srst *must* be asserted together.
535 */
536 void jtag_add_reset(int req_tlr_or_trst, int srst);
537
538 void jtag_add_sleep(uint32_t us);
539
540 int jtag_add_tms_seq(unsigned nbits, const uint8_t *seq, enum tap_state t);
541
542 /**
543 * Function jtag_add_clocks
544 * first checks that the state in which the clocks are to be issued is
545 * stable, then queues up num_cycles clocks for transmission.
546 */
547 void jtag_add_clocks(int num_cycles);
548
549 /**
550 * For software FIFO implementations, the queued commands can be executed
551 * during this call or earlier. A sw queue might decide to push out
552 * some of the jtag_add_xxx() operations once the queue is "big enough".
553 *
554 * This fn will return an error code if any of the prior jtag_add_xxx()
555 * calls caused a failure, e.g. check failure. Note that it does not
556 * matter if the operation was executed *before* jtag_execute_queue(),
557 * jtag_execute_queue() will still return an error code.
558 *
559 * All jtag_add_xxx() calls that have in_handler != NULL will have been
560 * executed when this fn returns, but if what has been queued only
561 * clocks data out, without reading anything back, then JTAG could
562 * be running *after* jtag_execute_queue() returns. The API does
563 * not define a way to flush a hw FIFO that runs *after*
564 * jtag_execute_queue() returns.
565 *
566 * jtag_add_xxx() commands can either be executed immediately or
567 * at some time between the jtag_add_xxx() fn call and jtag_execute_queue().
568 */
569 int jtag_execute_queue(void);
570
571 /** same as jtag_execute_queue() but does not clear the error flag */
572 void jtag_execute_queue_noclear(void);
573
574 /** @returns the number of times the scan queue has been flushed */
575 int jtag_get_flush_queue_count(void);
576
577 /** Report Tcl event to all TAPs */
578 void jtag_notify_event(enum jtag_event);
579
580 /* can be implemented by hw + sw */
581 int jtag_power_dropout(int *dropout);
582 int jtag_srst_asserted(int *srst_asserted);
583
584 /* JTAG support functions */
585
586 /**
587 * Execute jtag queue and check value with an optional mask.
588 * @param field Pointer to scan field.
589 * @param value Pointer to scan value.
590 * @param mask Pointer to scan mask; may be NULL.
591 * @returns Nothing, but calls jtag_set_error() on any error.
592 */
593 void jtag_check_value_mask(struct scan_field *field, uint8_t *value, uint8_t *mask);
594
595 void jtag_sleep(uint32_t us);
596
597 /*
598 * The JTAG subsystem defines a number of error codes,
599 * using codes between -100 and -199.
600 */
601 #define ERROR_JTAG_INIT_FAILED (-100)
602 #define ERROR_JTAG_INVALID_INTERFACE (-101)
603 #define ERROR_JTAG_NOT_IMPLEMENTED (-102)
604 #define ERROR_JTAG_TRST_ASSERTED (-103)
605 #define ERROR_JTAG_QUEUE_FAILED (-104)
606 #define ERROR_JTAG_NOT_STABLE_STATE (-105)
607 #define ERROR_JTAG_DEVICE_ERROR (-107)
608 #define ERROR_JTAG_STATE_INVALID (-108)
609 #define ERROR_JTAG_TRANSITION_INVALID (-109)
610 #define ERROR_JTAG_INIT_SOFT_FAIL (-110)
611
612 /**
613 * Set the current JTAG core execution error, unless one was set
614 * by a previous call previously. Driver or application code must
615 * use jtag_error_clear to reset jtag_error once this routine has been
616 * called with a non-zero error code.
617 */
618 void jtag_set_error(int error);
619 /**
620 * Resets jtag_error to ERROR_OK, returning its previous value.
621 * @returns The previous value of @c jtag_error.
622 */
623 int jtag_error_clear(void);
624
625 /**
626 * Return true if it's safe for a background polling task to access the
627 * JTAG scan chain. Polling may be explicitly disallowed, and is also
628 * unsafe while nTRST is active or the JTAG clock is gated off.
629 */
630 bool is_jtag_poll_safe(void);
631
632 /**
633 * Return flag reporting whether JTAG polling is disallowed.
634 */
635 bool jtag_poll_get_enabled(void);
636
637 /**
638 * Assign flag reporting whether JTAG polling is disallowed.
639 */
640 void jtag_poll_set_enabled(bool value);
641
642
643 /* The minidriver may have inline versions of some of the low
644 * level APIs that are used in inner loops. */
645 #include <jtag/minidriver.h>
646
647 bool transport_is_jtag(void);
648
649 int jim_jtag_newtap(Jim_Interp *interp, int argc, Jim_Obj *const *argv);
650
651 #endif /* JTAG_H */

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