1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (C) 2005 by Dominic Rath <Dominic.Rath@gmx.de>
4 * Copyright (C) 2007-2010 Øyvind Harboe <oyvind.harboe@zylin.com>
5 * Copyright (C) 2009 SoftPLC Corporation, http://softplc.com, Dick Hollenbeck <dick@softplc.com>
6 * Copyright (C) 2009 Zachary T Welch <zw@superlucidity.net>
7 * Copyright (C) 2018 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
16 #include "minidriver.h"
17 #include "interface.h"
18 #include "interfaces.h"
19 #include <transport/transport.h>
27 * Holds support for configuring debug adapters from TCl scripts.
30 struct adapter_driver *adapter_driver;
31 const char * const jtag_only[] = { "jtag", NULL };
33 enum adapter_clk_mode {
34 CLOCK_MODE_UNSELECTED = 0,
40 * Adapter configuration
43 bool adapter_initialized;
45 enum adapter_clk_mode clock_mode;
47 int rclk_fallback_speed_khz;
50 bool is_adapter_initialized(void)
52 return adapter_config.adapter_initialized;
56 * Do low-level setup like initializing registers, output signals,
59 int adapter_init(struct command_context *cmd_ctx)
61 if (is_adapter_initialized())
64 if (!adapter_driver) {
65 /* nothing was previously specified by "adapter driver" command */
66 LOG_ERROR("Debug Adapter has to be specified, "
67 "see \"adapter driver\" command");
68 return ERROR_JTAG_INVALID_INTERFACE;
72 retval = adapter_driver->init();
73 if (retval != ERROR_OK)
75 adapter_config.adapter_initialized = true;
77 if (!adapter_driver->speed) {
78 LOG_INFO("This adapter doesn't support configurable speed");
82 if (adapter_config.clock_mode == CLOCK_MODE_UNSELECTED) {
83 LOG_ERROR("An adapter speed is not selected in the init script."
84 " Insert a call to \"adapter speed\" or \"jtag_rclk\" to proceed.");
85 return ERROR_JTAG_INIT_FAILED;
88 int requested_khz = jtag_get_speed_khz();
89 int actual_khz = requested_khz;
90 int jtag_speed_var = 0;
91 retval = jtag_get_speed(&jtag_speed_var);
92 if (retval != ERROR_OK)
94 retval = adapter_driver->speed(jtag_speed_var);
95 if (retval != ERROR_OK)
97 retval = jtag_get_speed_readable(&actual_khz);
98 if (retval != ERROR_OK)
99 LOG_INFO("adapter-specific clock speed value %d", jtag_speed_var);
100 else if (actual_khz) {
101 /* Adaptive clocking -- JTAG-specific */
102 if ((adapter_config.clock_mode == CLOCK_MODE_RCLK)
103 || ((adapter_config.clock_mode == CLOCK_MODE_KHZ) && !requested_khz)) {
104 LOG_INFO("RCLK (adaptive clock speed) not supported - fallback to %d kHz"
107 LOG_INFO("clock speed %d kHz", actual_khz);
109 LOG_INFO("RCLK (adaptive clock speed)");
114 int adapter_quit(void)
116 if (is_adapter_initialized() && adapter_driver->quit) {
117 /* close the JTAG interface */
118 int result = adapter_driver->quit();
119 if (result != ERROR_OK)
120 LOG_ERROR("failed: %d", result);
123 struct jtag_tap *t = jtag_all_taps();
125 struct jtag_tap *n = t->next_tap;
133 unsigned jtag_get_speed_khz(void)
135 return adapter_config.speed_khz;
138 static int adapter_khz_to_speed(unsigned khz, int *speed)
140 LOG_DEBUG("convert khz to interface specific speed value");
141 adapter_config.speed_khz = khz;
142 if (!is_adapter_initialized())
144 LOG_DEBUG("have interface set up");
145 if (!adapter_driver->khz) {
146 LOG_ERROR("Translation from khz to jtag_speed not implemented");
150 int retval = adapter_driver->khz(jtag_get_speed_khz(), &speed_div1);
151 if (retval != ERROR_OK)
157 static int jtag_rclk_to_speed(unsigned fallback_speed_khz, int *speed)
159 int retval = adapter_khz_to_speed(0, speed);
160 if ((retval != ERROR_OK) && fallback_speed_khz) {
161 LOG_DEBUG("trying fallback speed...");
162 retval = adapter_khz_to_speed(fallback_speed_khz, speed);
167 static int jtag_set_speed(int speed)
169 /* this command can be called during CONFIG,
170 * in which case jtag isn't initialized */
171 return is_adapter_initialized() ? adapter_driver->speed(speed) : ERROR_OK;
174 int jtag_config_khz(unsigned khz)
176 LOG_DEBUG("handle jtag khz");
177 adapter_config.clock_mode = CLOCK_MODE_KHZ;
179 int retval = adapter_khz_to_speed(khz, &speed);
180 return (retval != ERROR_OK) ? retval : jtag_set_speed(speed);
183 int jtag_config_rclk(unsigned fallback_speed_khz)
185 LOG_DEBUG("handle jtag rclk");
186 adapter_config.clock_mode = CLOCK_MODE_RCLK;
187 adapter_config.rclk_fallback_speed_khz = fallback_speed_khz;
189 int retval = jtag_rclk_to_speed(fallback_speed_khz, &speed);
190 return (retval != ERROR_OK) ? retval : jtag_set_speed(speed);
193 int jtag_get_speed(int *speed)
195 switch (adapter_config.clock_mode) {
197 adapter_khz_to_speed(jtag_get_speed_khz(), speed);
199 case CLOCK_MODE_RCLK:
200 jtag_rclk_to_speed(adapter_config.rclk_fallback_speed_khz, speed);
203 LOG_ERROR("BUG: unknown jtag clock mode");
209 int jtag_get_speed_readable(int *khz)
211 int jtag_speed_var = 0;
212 int retval = jtag_get_speed(&jtag_speed_var);
213 if (retval != ERROR_OK)
215 if (!is_adapter_initialized())
217 if (!adapter_driver->speed_div) {
218 LOG_ERROR("Translation from jtag_speed to khz not implemented");
221 return adapter_driver->speed_div(jtag_speed_var, khz);
226 * 2 * 7 chars: max 7 ports
227 * 1 char: test for overflow
231 #define USB_MAX_LOCATION_LENGTH 16
233 #ifdef HAVE_LIBUSB_GET_PORT_NUMBERS
234 static void adapter_usb_set_location(const char *location)
236 if (strnlen(location, USB_MAX_LOCATION_LENGTH) == USB_MAX_LOCATION_LENGTH)
237 LOG_WARNING("usb location string is too long!!");
239 free(adapter_config.usb_location);
241 adapter_config.usb_location = strndup(location, USB_MAX_LOCATION_LENGTH);
243 #endif /* HAVE_LIBUSB_GET_PORT_NUMBERS */
245 const char *adapter_usb_get_location(void)
247 return adapter_config.usb_location;
250 bool adapter_usb_location_equal(uint8_t dev_bus, uint8_t *port_path, size_t path_len)
252 size_t path_step, string_length;
256 if (!adapter_usb_get_location())
259 /* strtok need non const char */
260 loc = strndup(adapter_usb_get_location(), USB_MAX_LOCATION_LENGTH);
261 string_length = strnlen(loc, USB_MAX_LOCATION_LENGTH);
263 ptr = strtok(loc, "-");
265 LOG_WARNING("no '-' in usb path\n");
269 string_length -= strnlen(ptr, string_length);
270 /* check bus mismatch */
271 if (atoi(ptr) != dev_bus)
275 while (path_step < path_len) {
276 ptr = strtok(NULL, ".");
278 /* no more tokens in path */
282 /* path mismatch at some step */
283 if (path_step < path_len && atoi(ptr) != port_path[path_step])
287 string_length -= strnlen(ptr, string_length) + 1;
290 /* walked the full path, all elements match */
291 if (path_step == path_len && !string_length)
299 static int jim_adapter_name(Jim_Interp *interp, int argc, Jim_Obj * const *argv)
301 struct jim_getopt_info goi;
302 jim_getopt_setup(&goi, interp, argc-1, argv + 1);
304 /* return the name of the interface */
305 /* TCL code might need to know the exact type... */
306 /* FUTURE: we allow this as a means to "set" the interface. */
308 Jim_WrongNumArgs(goi.interp, 1, goi.argv-1, "(no params)");
311 const char *name = adapter_driver ? adapter_driver->name : NULL;
312 Jim_SetResultString(goi.interp, name ? name : "undefined", -1);
316 COMMAND_HANDLER(adapter_transports_command)
321 retval = CALL_COMMAND_HANDLER(transport_list_parse, &transports);
322 if (retval != ERROR_OK)
325 retval = allow_transports(CMD_CTX, (const char **)transports);
327 if (retval != ERROR_OK) {
328 for (unsigned i = 0; transports[i]; i++)
335 COMMAND_HANDLER(handle_adapter_list_command)
337 if (strcmp(CMD_NAME, "list") == 0 && CMD_ARGC > 0)
338 return ERROR_COMMAND_SYNTAX_ERROR;
340 command_print(CMD, "The following debug adapters are available:");
341 for (unsigned i = 0; adapter_drivers[i]; i++) {
342 const char *name = adapter_drivers[i]->name;
343 command_print(CMD, "%u: %s", i + 1, name);
349 COMMAND_HANDLER(handle_adapter_driver_command)
353 /* check whether the interface is already configured */
354 if (adapter_driver) {
355 LOG_WARNING("Interface already configured, ignoring");
359 /* interface name is a mandatory argument */
360 if (CMD_ARGC != 1 || CMD_ARGV[0][0] == '\0')
361 return ERROR_COMMAND_SYNTAX_ERROR;
363 for (unsigned i = 0; adapter_drivers[i]; i++) {
364 if (strcmp(CMD_ARGV[0], adapter_drivers[i]->name) != 0)
367 if (adapter_drivers[i]->commands) {
368 retval = register_commands(CMD_CTX, NULL,
369 adapter_drivers[i]->commands);
370 if (retval != ERROR_OK)
374 adapter_driver = adapter_drivers[i];
376 return allow_transports(CMD_CTX, adapter_driver->transports);
379 /* no valid interface was found (i.e. the configuration option,
380 * didn't match one of the compiled-in interfaces
382 LOG_ERROR("The specified debug interface was not found (%s)",
384 CALL_COMMAND_HANDLER(handle_adapter_list_command);
385 return ERROR_JTAG_INVALID_INTERFACE;
388 COMMAND_HANDLER(handle_reset_config_command)
393 /* Original versions cared about the order of these tokens:
394 * reset_config signals [combination [trst_type [srst_type]]]
395 * They also clobbered the previous configuration even on error.
397 * Here we don't care about the order, and only change values
398 * which have been explicitly specified.
400 for (; CMD_ARGC; CMD_ARGC--, CMD_ARGV++) {
405 m = RESET_SRST_NO_GATING;
406 if (strcmp(*CMD_ARGV, "srst_gates_jtag") == 0)
407 /* default: don't use JTAG while SRST asserted */;
408 else if (strcmp(*CMD_ARGV, "srst_nogate") == 0)
409 tmp = RESET_SRST_NO_GATING;
413 LOG_ERROR("extra reset_config %s spec (%s)",
414 "gating", *CMD_ARGV);
415 return ERROR_COMMAND_SYNTAX_ERROR;
421 m = RESET_HAS_TRST | RESET_HAS_SRST;
422 if (strcmp(*CMD_ARGV, "none") == 0)
424 else if (strcmp(*CMD_ARGV, "trst_only") == 0)
425 tmp = RESET_HAS_TRST;
426 else if (strcmp(*CMD_ARGV, "srst_only") == 0)
427 tmp = RESET_HAS_SRST;
428 else if (strcmp(*CMD_ARGV, "trst_and_srst") == 0)
429 tmp = RESET_HAS_TRST | RESET_HAS_SRST;
433 LOG_ERROR("extra reset_config %s spec (%s)",
434 "signal", *CMD_ARGV);
435 return ERROR_COMMAND_SYNTAX_ERROR;
440 /* combination (options for broken wiring) */
441 m = RESET_SRST_PULLS_TRST | RESET_TRST_PULLS_SRST;
442 if (strcmp(*CMD_ARGV, "separate") == 0)
443 /* separate reset lines - default */;
444 else if (strcmp(*CMD_ARGV, "srst_pulls_trst") == 0)
445 tmp |= RESET_SRST_PULLS_TRST;
446 else if (strcmp(*CMD_ARGV, "trst_pulls_srst") == 0)
447 tmp |= RESET_TRST_PULLS_SRST;
448 else if (strcmp(*CMD_ARGV, "combined") == 0)
449 tmp |= RESET_SRST_PULLS_TRST | RESET_TRST_PULLS_SRST;
453 LOG_ERROR("extra reset_config %s spec (%s)",
454 "combination", *CMD_ARGV);
455 return ERROR_COMMAND_SYNTAX_ERROR;
460 /* trst_type (NOP without HAS_TRST) */
461 m = RESET_TRST_OPEN_DRAIN;
462 if (strcmp(*CMD_ARGV, "trst_open_drain") == 0)
463 tmp |= RESET_TRST_OPEN_DRAIN;
464 else if (strcmp(*CMD_ARGV, "trst_push_pull") == 0)
465 /* push/pull from adapter - default */;
469 LOG_ERROR("extra reset_config %s spec (%s)",
470 "trst_type", *CMD_ARGV);
471 return ERROR_COMMAND_SYNTAX_ERROR;
476 /* srst_type (NOP without HAS_SRST) */
477 m = RESET_SRST_PUSH_PULL;
478 if (strcmp(*CMD_ARGV, "srst_push_pull") == 0)
479 tmp |= RESET_SRST_PUSH_PULL;
480 else if (strcmp(*CMD_ARGV, "srst_open_drain") == 0)
481 /* open drain from adapter - default */;
485 LOG_ERROR("extra reset_config %s spec (%s)",
486 "srst_type", *CMD_ARGV);
487 return ERROR_COMMAND_SYNTAX_ERROR;
492 /* connect_type - only valid when srst_nogate */
493 m = RESET_CNCT_UNDER_SRST;
494 if (strcmp(*CMD_ARGV, "connect_assert_srst") == 0)
495 tmp |= RESET_CNCT_UNDER_SRST;
496 else if (strcmp(*CMD_ARGV, "connect_deassert_srst") == 0)
497 /* connect normally - default */;
501 LOG_ERROR("extra reset_config %s spec (%s)",
502 "connect_type", *CMD_ARGV);
503 return ERROR_COMMAND_SYNTAX_ERROR;
508 /* caller provided nonsense; fail */
509 LOG_ERROR("unknown reset_config flag (%s)", *CMD_ARGV);
510 return ERROR_COMMAND_SYNTAX_ERROR;
513 /* Remember the bits which were specified (mask)
514 * and their new values (new_cfg).
520 /* clear previous values of those bits, save new values */
522 int old_cfg = jtag_get_reset_config();
526 jtag_set_reset_config(new_cfg);
528 new_cfg = jtag_get_reset_config();
531 * Display the (now-)current reset mode
535 /* minimal JTAG has neither SRST nor TRST (so that's the default) */
536 switch (new_cfg & (RESET_HAS_TRST | RESET_HAS_SRST)) {
538 modes[0] = "srst_only";
541 modes[0] = "trst_only";
543 case RESET_TRST_AND_SRST:
544 modes[0] = "trst_and_srst";
551 /* normally SRST and TRST are decoupled; but bugs happen ... */
552 switch (new_cfg & (RESET_SRST_PULLS_TRST | RESET_TRST_PULLS_SRST)) {
553 case RESET_SRST_PULLS_TRST:
554 modes[1] = "srst_pulls_trst";
556 case RESET_TRST_PULLS_SRST:
557 modes[1] = "trst_pulls_srst";
559 case RESET_SRST_PULLS_TRST | RESET_TRST_PULLS_SRST:
560 modes[1] = "combined";
563 modes[1] = "separate";
567 /* TRST-less connectors include Altera, Xilinx, and minimal JTAG */
568 if (new_cfg & RESET_HAS_TRST) {
569 if (new_cfg & RESET_TRST_OPEN_DRAIN)
570 modes[3] = " trst_open_drain";
572 modes[3] = " trst_push_pull";
576 /* SRST-less connectors include TI-14, Xilinx, and minimal JTAG */
577 if (new_cfg & RESET_HAS_SRST) {
578 if (new_cfg & RESET_SRST_NO_GATING)
579 modes[2] = " srst_nogate";
581 modes[2] = " srst_gates_jtag";
583 if (new_cfg & RESET_SRST_PUSH_PULL)
584 modes[4] = " srst_push_pull";
586 modes[4] = " srst_open_drain";
588 if (new_cfg & RESET_CNCT_UNDER_SRST)
589 modes[5] = " connect_assert_srst";
591 modes[5] = " connect_deassert_srst";
598 command_print(CMD, "%s %s%s%s%s%s",
600 modes[2], modes[3], modes[4], modes[5]);
605 COMMAND_HANDLER(handle_adapter_srst_delay_command)
608 return ERROR_COMMAND_SYNTAX_ERROR;
611 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], delay);
613 jtag_set_nsrst_delay(delay);
615 command_print(CMD, "adapter srst delay: %u", jtag_get_nsrst_delay());
619 COMMAND_HANDLER(handle_adapter_srst_pulse_width_command)
622 return ERROR_COMMAND_SYNTAX_ERROR;
625 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], width);
627 jtag_set_nsrst_assert_width(width);
629 command_print(CMD, "adapter srst pulse_width: %u", jtag_get_nsrst_assert_width());
633 COMMAND_HANDLER(handle_adapter_speed_command)
636 return ERROR_COMMAND_SYNTAX_ERROR;
638 int retval = ERROR_OK;
641 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], khz);
643 retval = jtag_config_khz(khz);
644 if (retval != ERROR_OK)
648 int cur_speed = jtag_get_speed_khz();
649 retval = jtag_get_speed_readable(&cur_speed);
650 if (retval != ERROR_OK)
654 command_print(CMD, "adapter speed: %d kHz", cur_speed);
656 command_print(CMD, "adapter speed: RCLK - adaptive");
661 COMMAND_HANDLER(handle_adapter_reset_de_assert)
664 VALUE_UNDEFINED = -1,
669 enum values srst = VALUE_UNDEFINED;
670 enum values trst = VALUE_UNDEFINED;
671 enum reset_types jtag_reset_config = jtag_get_reset_config();
675 if (transport_is_jtag()) {
676 if (jtag_reset_config & RESET_HAS_TRST)
677 signal = jtag_get_trst() ? "asserted" : "deasserted";
679 signal = "not present";
680 command_print(CMD, "trst %s", signal);
683 if (jtag_reset_config & RESET_HAS_SRST)
684 signal = jtag_get_srst() ? "asserted" : "deasserted";
686 signal = "not present";
687 command_print(CMD, "srst %s", signal);
692 if (CMD_ARGC != 1 && CMD_ARGC != 3)
693 return ERROR_COMMAND_SYNTAX_ERROR;
695 value = (strcmp(CMD_NAME, "assert") == 0) ? VALUE_ASSERT : VALUE_DEASSERT;
696 if (strcmp(CMD_ARGV[0], "srst") == 0)
698 else if (strcmp(CMD_ARGV[0], "trst") == 0)
701 return ERROR_COMMAND_SYNTAX_ERROR;
704 if (strcmp(CMD_ARGV[1], "assert") == 0)
705 value = VALUE_ASSERT;
706 else if (strcmp(CMD_ARGV[1], "deassert") == 0)
707 value = VALUE_DEASSERT;
709 return ERROR_COMMAND_SYNTAX_ERROR;
711 if (strcmp(CMD_ARGV[2], "srst") == 0 && srst == VALUE_UNDEFINED)
713 else if (strcmp(CMD_ARGV[2], "trst") == 0 && trst == VALUE_UNDEFINED)
716 return ERROR_COMMAND_SYNTAX_ERROR;
719 if (trst == VALUE_UNDEFINED) {
720 if (transport_is_jtag())
721 trst = jtag_get_trst() ? VALUE_ASSERT : VALUE_DEASSERT;
723 trst = VALUE_DEASSERT; /* unused, safe value */
726 if (srst == VALUE_UNDEFINED) {
727 if (jtag_reset_config & RESET_HAS_SRST)
728 srst = jtag_get_srst() ? VALUE_ASSERT : VALUE_DEASSERT;
730 srst = VALUE_DEASSERT; /* unused, safe value */
733 if (trst == VALUE_ASSERT && !transport_is_jtag()) {
734 LOG_ERROR("transport has no trst signal");
738 if (srst == VALUE_ASSERT && !(jtag_reset_config & RESET_HAS_SRST)) {
739 LOG_ERROR("adapter has no srst signal");
743 return adapter_resets((trst == VALUE_DEASSERT) ? TRST_DEASSERT : TRST_ASSERT,
744 (srst == VALUE_DEASSERT) ? SRST_DEASSERT : SRST_ASSERT);
747 #ifdef HAVE_LIBUSB_GET_PORT_NUMBERS
748 COMMAND_HANDLER(handle_usb_location_command)
751 adapter_usb_set_location(CMD_ARGV[0]);
753 command_print(CMD, "adapter usb location: %s", adapter_usb_get_location());
757 #endif /* HAVE_LIBUSB_GET_PORT_NUMBERS */
759 static const struct command_registration adapter_usb_command_handlers[] = {
760 #ifdef HAVE_LIBUSB_GET_PORT_NUMBERS
763 .handler = &handle_usb_location_command,
764 .mode = COMMAND_CONFIG,
765 .help = "display or set the USB bus location of the USB device",
766 .usage = "[<bus>-port[.port]...]",
768 #endif /* HAVE_LIBUSB_GET_PORT_NUMBERS */
769 COMMAND_REGISTRATION_DONE
772 static const struct command_registration adapter_srst_command_handlers[] = {
775 .handler = handle_adapter_srst_delay_command,
777 .help = "delay after deasserting SRST in ms",
778 .usage = "[milliseconds]",
781 .name = "pulse_width",
782 .handler = handle_adapter_srst_pulse_width_command,
784 .help = "SRST assertion pulse width in ms",
785 .usage = "[milliseconds]",
787 COMMAND_REGISTRATION_DONE
790 static const struct command_registration adapter_command_handlers[] = {
793 .handler = handle_adapter_driver_command,
794 .mode = COMMAND_CONFIG,
795 .help = "Select a debug adapter driver",
796 .usage = "driver_name",
800 .handler = handle_adapter_speed_command,
802 .help = "With an argument, change to the specified maximum "
803 "jtag speed. For JTAG, 0 KHz signifies adaptive "
805 "With or without argument, display current setting.",
810 .handler = handle_adapter_list_command,
812 .help = "List all built-in debug adapter drivers",
818 .jim_handler = jim_adapter_name,
819 .help = "Returns the name of the currently "
820 "selected adapter (driver)",
825 .help = "srst adapter command group",
827 .chain = adapter_srst_command_handlers,
830 .name = "transports",
831 .handler = adapter_transports_command,
832 .mode = COMMAND_CONFIG,
833 .help = "Declare transports the adapter supports.",
834 .usage = "transport ...",
839 .help = "usb adapter command group",
841 .chain = adapter_usb_command_handlers,
845 .handler = handle_adapter_reset_de_assert,
846 .mode = COMMAND_EXEC,
847 .help = "Controls SRST and TRST lines.",
848 .usage = "|deassert [srst|trst [assert|deassert srst|trst]]",
852 .handler = handle_adapter_reset_de_assert,
853 .mode = COMMAND_EXEC,
854 .help = "Controls SRST and TRST lines.",
855 .usage = "|assert [srst|trst [deassert|assert srst|trst]]",
857 COMMAND_REGISTRATION_DONE
860 static const struct command_registration interface_command_handlers[] = {
864 .help = "adapter command group",
866 .chain = adapter_command_handlers,
869 .name = "reset_config",
870 .handler = handle_reset_config_command,
872 .help = "configure adapter reset behavior",
873 .usage = "[none|trst_only|srst_only|trst_and_srst] "
874 "[srst_pulls_trst|trst_pulls_srst|combined|separate] "
875 "[srst_gates_jtag|srst_nogate] "
876 "[trst_push_pull|trst_open_drain] "
877 "[srst_push_pull|srst_open_drain] "
878 "[connect_deassert_srst|connect_assert_srst]",
880 COMMAND_REGISTRATION_DONE
884 * Register the commands which deal with arbitrary debug adapter drivers.
886 * @todo Remove internal assumptions that all debug adapters use JTAG for
887 * transport. Various types and data structures are not named generically.
889 int interface_register_commands(struct command_context *ctx)
891 return register_commands(ctx, NULL, interface_command_handlers);