tcl.c 40 KB
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/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
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 *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
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 *   oyvind.harboe@zylin.com                                               *
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 *                                                                         *
 *   Copyright (C) 2009 SoftPLC Corporation                                *
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 *       http://softplc.com                                                *
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 *   dick@softplc.com                                                      *
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 *                                                                         *
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 *   Copyright (C) 2009 Zachary T Welch                                    *
 *   zw@superlucidity.net                                                  *
 *                                                                         *
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 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "jtag.h"
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#include "minidriver.h"
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#include "interface.h"
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#include "interfaces.h"
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#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
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static const Jim_Nvp nvp_jtag_tap_event[] = {
	{ .value = JTAG_TAP_EVENT_ENABLE,       .name = "tap-enable" },
	{ .value = JTAG_TAP_EVENT_DISABLE,      .name = "tap-disable" },

	{ .name = NULL, .value = -1 }
};
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extern jtag_interface_t *jtag_interface;
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/* jtag commands */
static int handle_interface_list_command(struct command_context_s *cmd_ctx,
		char *cmd, char **args, int argc);
static int handle_interface_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int handle_jtag_speed_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int handle_jtag_khz_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
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static int handle_jtag_rclk_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
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static int handle_jtag_device_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int handle_reset_config_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int handle_jtag_nsrst_delay_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int handle_jtag_ntrst_delay_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
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static int handle_scan_chain_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
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static int handle_jtag_reset_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int handle_runtest_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int handle_irscan_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int Jim_Command_drscan(Jim_Interp *interp, int argc, Jim_Obj *const *argv);
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static int Jim_Command_pathmove(Jim_Interp *interp, int argc, Jim_Obj *const *argv);
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static int Jim_Command_flush_count(Jim_Interp *interp, int argc, Jim_Obj *const *args);
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static int handle_verify_ircapture_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int handle_verify_jtag_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int handle_tms_sequence_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
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extern int jtag_examine_chain(void);
extern int jtag_validate_chain(void);
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enum jtag_tap_cfg_param {
	JCFG_EVENT
};

static Jim_Nvp nvp_config_opts[] = {
	{ .name = "-event",      .value = JCFG_EVENT },

	{ .name = NULL,          .value = -1 }
};

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static int jtag_tap_configure_cmd(Jim_GetOptInfo *goi, jtag_tap_t * tap)
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{
	Jim_Nvp *n;
	Jim_Obj *o;
	int e;

	/* parse config or cget options */
	while (goi->argc > 0) {
		Jim_SetEmptyResult (goi->interp);

		e = Jim_GetOpt_Nvp(goi, nvp_config_opts, &n);
		if (e != JIM_OK) {
			Jim_GetOpt_NvpUnknown(goi, nvp_config_opts, 0);
			return e;
		}

		switch (n->value) {
			case JCFG_EVENT:
				if (goi->argc == 0) {
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					Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "-event ?event-name? ...");
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					return JIM_ERR;
				}

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				e = Jim_GetOpt_Nvp(goi, nvp_jtag_tap_event, &n);
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				if (e != JIM_OK) {
					Jim_GetOpt_NvpUnknown(goi, nvp_jtag_tap_event, 1);
					return e;
				}

				if (goi->isconfigure) {
					if (goi->argc != 1) {
						Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "-event ?event-name? ?EVENT-BODY?");
						return JIM_ERR;
					}
				} else {
					if (goi->argc != 0) {
						Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "-event ?event-name?");
						return JIM_ERR;
					}
				}

				{
					jtag_tap_event_action_t *jteap;

					jteap = tap->event_action;
					/* replace existing? */
					while (jteap) {
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						if (jteap->event == (enum jtag_event)n->value) {
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							break;
						}
						jteap = jteap->next;
					}

					if (goi->isconfigure) {
						if (jteap == NULL) {
							/* create new */
							jteap = calloc(1, sizeof (*jteap));
						}
						jteap->event = n->value;
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						Jim_GetOpt_Obj(goi, &o);
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						if (jteap->body) {
							Jim_DecrRefCount(interp, jteap->body);
						}
						jteap->body = Jim_DuplicateObj(goi->interp, o);
						Jim_IncrRefCount(jteap->body);

						/* add to head of event list */
						jteap->next = tap->event_action;
						tap->event_action = jteap;
						Jim_SetEmptyResult(goi->interp);
					} else {
						/* get */
						if (jteap == NULL) {
							Jim_SetEmptyResult(goi->interp);
						} else {
							Jim_SetResult(goi->interp, Jim_DuplicateObj(goi->interp, jteap->body));
						}
					}
				}
				/* loop for more */
				break;
		}
	} /* while (goi->argc) */

	return JIM_OK;
}
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static int is_bad_irval(int ir_length, jim_wide w)
{
	jim_wide v = 1;

	v <<= ir_length;
	v -= 1;
	v = ~v;
	return (w & v) != 0;
}
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static int jim_newtap_cmd(Jim_GetOptInfo *goi)
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{
	jtag_tap_t *pTap;
	jim_wide w;
	int x;
	int e;
	int reqbits;
	Jim_Nvp *n;
	char *cp;
	const Jim_Nvp opts[] = {
#define NTAP_OPT_IRLEN     0
		{ .name = "-irlen"			,	.value = NTAP_OPT_IRLEN },
#define NTAP_OPT_IRMASK    1
		{ .name = "-irmask"			,	.value = NTAP_OPT_IRMASK },
#define NTAP_OPT_IRCAPTURE 2
		{ .name = "-ircapture"		,	.value = NTAP_OPT_IRCAPTURE },
#define NTAP_OPT_ENABLED   3
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		{ .name = "-enable"			,	.value = NTAP_OPT_ENABLED },
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#define NTAP_OPT_DISABLED  4
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		{ .name = "-disable"		,	.value = NTAP_OPT_DISABLED },
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#define NTAP_OPT_EXPECTED_ID 5
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		{ .name = "-expected-id"	,	.value = NTAP_OPT_EXPECTED_ID },
		{ .name = NULL				,	.value = -1 },
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	};

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	pTap = calloc(1, sizeof(jtag_tap_t));
	if (!pTap) {
		Jim_SetResult_sprintf(goi->interp, "no memory");
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		return JIM_ERR;
	}
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	/*
	 * we expect CHIP + TAP + OPTIONS
	 * */
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	if (goi->argc < 3) {
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		Jim_SetResult_sprintf(goi->interp, "Missing CHIP TAP OPTIONS ....");
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		free(pTap);
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		return JIM_ERR;
	}
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	Jim_GetOpt_String(goi, &cp, NULL);
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	pTap->chip = strdup(cp);

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	Jim_GetOpt_String(goi, &cp, NULL);
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	pTap->tapname = strdup(cp);
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	/* name + dot + name + null */
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	x = strlen(pTap->chip) + 1 + strlen(pTap->tapname) + 1;
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	cp = malloc(x);
	sprintf(cp, "%s.%s", pTap->chip, pTap->tapname);
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	pTap->dotted_name = cp;

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	LOG_DEBUG("Creating New Tap, Chip: %s, Tap: %s, Dotted: %s, %d params",
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			  pTap->chip, pTap->tapname, pTap->dotted_name, goi->argc);

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	/* deal with options */
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#define NTREQ_IRLEN      1
#define NTREQ_IRCAPTURE  2
#define NTREQ_IRMASK     4

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	/* clear them as we find them */
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	reqbits = (NTREQ_IRLEN | NTREQ_IRCAPTURE | NTREQ_IRMASK);
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	while (goi->argc) {
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		e = Jim_GetOpt_Nvp(goi, opts, &n);
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		if (e != JIM_OK) {
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			Jim_GetOpt_NvpUnknown(goi, opts, 0);
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			free((void *)pTap->dotted_name);
			free(pTap);
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			return e;
		}
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		LOG_DEBUG("Processing option: %s", n->name);
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		switch (n->value) {
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		case NTAP_OPT_ENABLED:
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			pTap->disabled_after_reset = false;
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			break;
		case NTAP_OPT_DISABLED:
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			pTap->disabled_after_reset = true;
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			break;
		case NTAP_OPT_EXPECTED_ID:
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		{
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			uint32_t *new_expected_ids;
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			e = Jim_GetOpt_Wide(goi, &w);
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			if (e != JIM_OK) {
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				Jim_SetResult_sprintf(goi->interp, "option: %s bad parameter", n->name);
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				free((void *)pTap->dotted_name);
				free(pTap);
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				return e;
			}

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			new_expected_ids = malloc(sizeof(uint32_t) * (pTap->expected_ids_cnt + 1));
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			if (new_expected_ids == NULL) {
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				Jim_SetResult_sprintf(goi->interp, "no memory");
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				free((void *)pTap->dotted_name);
				free(pTap);
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				return JIM_ERR;
			}

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			memcpy(new_expected_ids, pTap->expected_ids, sizeof(uint32_t) * pTap->expected_ids_cnt);
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			new_expected_ids[pTap->expected_ids_cnt] = w;
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			free(pTap->expected_ids);
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			pTap->expected_ids = new_expected_ids;
			pTap->expected_ids_cnt++;
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			break;
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		}
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		case NTAP_OPT_IRLEN:
		case NTAP_OPT_IRMASK:
		case NTAP_OPT_IRCAPTURE:
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			e = Jim_GetOpt_Wide(goi, &w);
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			if (e != JIM_OK) {
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				Jim_SetResult_sprintf(goi->interp, "option: %s bad parameter", n->name);
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				free((void *)pTap->dotted_name);
				free(pTap);
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				return e;
			}
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			switch (n->value) {
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			case NTAP_OPT_IRLEN:
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				if (w > (jim_wide) (8 * sizeof(pTap->ir_capture_value)))
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					LOG_WARNING("huge IR length %d", (int) w);
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				pTap->ir_length = w;
				reqbits &= (~(NTREQ_IRLEN));
				break;
			case NTAP_OPT_IRMASK:
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				if (is_bad_irval(pTap->ir_length, w)) {
					LOG_ERROR("IR mask %x too big",
							(int) w);
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					free((void *)pTap->dotted_name);
					free(pTap);
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					return ERROR_FAIL;
				}
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				pTap->ir_capture_mask = w;
				reqbits &= (~(NTREQ_IRMASK));
				break;
			case NTAP_OPT_IRCAPTURE:
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				if (is_bad_irval(pTap->ir_length, w)) {
					LOG_ERROR("IR capture %x too big",
							(int) w);
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					free((void *)pTap->dotted_name);
					free(pTap);
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					return ERROR_FAIL;
				}
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				pTap->ir_capture_value = w;
				reqbits &= (~(NTREQ_IRCAPTURE));
				break;
			}
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		} /* switch (n->value) */
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	} /* while (goi->argc) */
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	/* default is enabled-after-reset */
	pTap->enabled = !pTap->disabled_after_reset;

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	/* Did all the required option bits get cleared? */
	if (0 == reqbits)
	{
		jtag_tap_init(pTap);
		return ERROR_OK;
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	}

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	Jim_SetResult_sprintf(goi->interp,
			"newtap: %s missing required parameters",
			pTap->dotted_name);
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	jtag_tap_free(pTap);
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	return JIM_ERR;
}
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static void jtag_tap_handle_event(jtag_tap_t *tap, enum jtag_event e)
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{
	jtag_tap_event_action_t * jteap;
	int done;

	jteap = tap->event_action;

	done = 0;
	while (jteap) {
		if (jteap->event == e) {
			done = 1;
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			LOG_DEBUG("JTAG tap: %s event: %d (%s) action: %s\n",
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					tap->dotted_name,
					e,
					Jim_Nvp_value2name_simple(nvp_jtag_tap_event, e)->name,
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					Jim_GetString(jteap->body, NULL));
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			if (Jim_EvalObj(interp, jteap->body) != JIM_OK) {
				Jim_PrintErrorMessage(interp);
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			} else {
				/* NOTE:  we currently assume the handlers
				 * can't fail.  That presumes later code
				 * will be verifying the scan chains ...
				 */
				tap->enabled = (e == JTAG_TAP_EVENT_ENABLE);
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			}
		}

		jteap = jteap->next;
	}

	if (!done) {
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		LOG_DEBUG("event %d %s - no action",
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				e,
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				Jim_Nvp_value2name_simple(nvp_jtag_tap_event, e)->name);
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	}
}


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static int jim_jtag_command(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
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{
	Jim_GetOptInfo goi;
	int e;
	Jim_Nvp *n;
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	Jim_Obj *o;
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	struct command_context_s *context;

	enum {
		JTAG_CMD_INTERFACE,
		JTAG_CMD_INIT_RESET,
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		JTAG_CMD_NEWTAP,
		JTAG_CMD_TAPENABLE,
		JTAG_CMD_TAPDISABLE,
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		JTAG_CMD_TAPISENABLED,
		JTAG_CMD_CONFIGURE,
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		JTAG_CMD_CGET,
		JTAG_CMD_NAMES,
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	};
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	const Jim_Nvp jtag_cmds[] = {
		{ .name = "interface"     , .value = JTAG_CMD_INTERFACE },
		{ .name = "arp_init-reset", .value = JTAG_CMD_INIT_RESET },
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		{ .name = "newtap"        , .value = JTAG_CMD_NEWTAP },
		{ .name = "tapisenabled"     , .value = JTAG_CMD_TAPISENABLED },
		{ .name = "tapenable"     , .value = JTAG_CMD_TAPENABLE },
		{ .name = "tapdisable"    , .value = JTAG_CMD_TAPDISABLE },
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		{ .name = "configure"     , .value = JTAG_CMD_CONFIGURE },
		{ .name = "cget"          , .value = JTAG_CMD_CGET },
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		{ .name = "names"         , .value = JTAG_CMD_NAMES },
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		{ .name = NULL, .value = -1 },
	};

	context = Jim_GetAssocData(interp, "context");
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	/* go past the command */
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	Jim_GetOpt_Setup(&goi, interp, argc-1, argv + 1);
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	e = Jim_GetOpt_Nvp(&goi, jtag_cmds, &n);
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	if (e != JIM_OK) {
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		Jim_GetOpt_NvpUnknown(&goi, jtag_cmds, 0);
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		return e;
	}
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		Jim_SetEmptyResult(goi.interp);
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	switch (n->value) {
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	case JTAG_CMD_INTERFACE:
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		/* return the name of the interface */
		/* TCL code might need to know the exact type... */
		/* FUTURE: we allow this as a means to "set" the interface. */
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		if (goi.argc != 0) {
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			Jim_WrongNumArgs(goi.interp, 1, goi.argv-1, "(no params)");
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			return JIM_ERR;
		}
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		Jim_SetResultString(goi.interp, jtag_interface->name, -1);
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		return JIM_OK;
	case JTAG_CMD_INIT_RESET:
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		if (goi.argc != 0) {
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			Jim_WrongNumArgs(goi.interp, 1, goi.argv-1, "(no params)");
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			return JIM_ERR;
		}
		e = jtag_init_reset(context);
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		if (e != ERROR_OK) {
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			Jim_SetResult_sprintf(goi.interp, "error: %d", e);
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			return JIM_ERR;
		}
		return JIM_OK;
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	case JTAG_CMD_NEWTAP:
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		return jim_newtap_cmd(&goi);
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		break;
	case JTAG_CMD_TAPISENABLED:
	case JTAG_CMD_TAPENABLE:
	case JTAG_CMD_TAPDISABLE:
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		if (goi.argc != 1) {
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			Jim_SetResultString(goi.interp, "Too many parameters",-1);
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			return JIM_ERR;
		}
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		{
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			jtag_tap_t *t;
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			t = jtag_tap_by_jim_obj(goi.interp, goi.argv[0]);
			if (t == NULL)
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				return JIM_ERR;
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			switch (n->value) {
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			case JTAG_CMD_TAPISENABLED:
				break;
			case JTAG_CMD_TAPENABLE:
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				if (t->enabled)
					break;
				jtag_tap_handle_event(t, JTAG_TAP_EVENT_ENABLE);
				if (!t->enabled)
					break;

				/* FIXME add JTAG sanity checks, w/o TLR
				 *  - scan chain length grew by one (this)
				 *  - IDs and IR lengths are as expected
				 */
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				jtag_call_event_callbacks(JTAG_TAP_EVENT_ENABLE);
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				break;
			case JTAG_CMD_TAPDISABLE:
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				if (!t->enabled)
					break;
				jtag_tap_handle_event(t, JTAG_TAP_EVENT_DISABLE);
				if (t->enabled)
					break;

				/* FIXME add JTAG sanity checks, w/o TLR
				 *  - scan chain length shrank by one (this)
				 *  - IDs and IR lengths are as expected
				 */
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				jtag_call_event_callbacks(JTAG_TAP_EVENT_DISABLE);
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				break;
			}
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			e = t->enabled;
			Jim_SetResult(goi.interp, Jim_NewIntObj(goi.interp, e));
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			return JIM_OK;
		}
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		break;

	case JTAG_CMD_CGET:
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		if (goi.argc < 2) {
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			Jim_WrongNumArgs(goi.interp, 0, NULL,
					"cget tap_name queryparm");
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			return JIM_ERR;
		}

		{
			jtag_tap_t *t;

			Jim_GetOpt_Obj(&goi, &o);
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			t = jtag_tap_by_jim_obj(goi.interp, o);
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			if (t == NULL) {
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				return JIM_ERR;
			}

			goi.isconfigure = 0;
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			return jtag_tap_configure_cmd(&goi, t);
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		}
		break;

	case JTAG_CMD_CONFIGURE:
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		if (goi.argc < 3) {
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			Jim_WrongNumArgs(goi.interp, 0, NULL,
					"configure tap_name attribute value ...");
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			return JIM_ERR;
		}

		{
			jtag_tap_t *t;

			Jim_GetOpt_Obj(&goi, &o);
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			t = jtag_tap_by_jim_obj(goi.interp, o);
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			if (t == NULL) {
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				return JIM_ERR;
			}

			goi.isconfigure = 1;
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			return jtag_tap_configure_cmd(&goi, t);
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		}
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		break;

	case JTAG_CMD_NAMES:
		if (goi.argc != 0) {
			Jim_WrongNumArgs(goi.interp, 1, goi.argv, "Too many parameters");
			return JIM_ERR;
		}
		Jim_SetResult(goi.interp, Jim_NewListObj(goi.interp, NULL, 0));
		{
			jtag_tap_t *tap;

			for (tap = jtag_all_taps(); tap; tap = tap->next_tap) {
				Jim_ListAppendElement(goi.interp,
					Jim_GetResult(goi.interp),
					Jim_NewStringObj(goi.interp,
						tap->dotted_name, -1));
			}
			return JIM_OK;
		}
		break;

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	}
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	return JIM_ERR;
}

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int jtag_register_commands(struct command_context_s *cmd_ctx)
{
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	register_jim(cmd_ctx, "jtag", jim_jtag_command, "perform jtag tap actions");
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	register_command(cmd_ctx, NULL, "interface", handle_interface_command,
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		COMMAND_CONFIG, "try to configure interface");
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	register_command(cmd_ctx, NULL,
		"interface_list", &handle_interface_list_command,
		COMMAND_ANY, "list all built-in interfaces");
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	register_command(cmd_ctx, NULL, "jtag_speed", handle_jtag_speed_command,
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		COMMAND_ANY, "(DEPRECATED) set jtag speed (if supported)");
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	register_command(cmd_ctx, NULL, "jtag_khz", handle_jtag_khz_command,
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		COMMAND_ANY, "set maximum jtag speed (if supported); "
		"parameter is maximum khz, or 0 for adaptive clocking (RTCK).");
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	register_command(cmd_ctx, NULL, "jtag_rclk", handle_jtag_rclk_command,
		COMMAND_ANY, "fallback_speed_khz - set JTAG speed to RCLK or use fallback speed");
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	register_command(cmd_ctx, NULL, "jtag_device", handle_jtag_device_command,
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		COMMAND_CONFIG, "(DEPRECATED) jtag_device <ir_length> <ir_expected> <ir_mask>");
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	register_command(cmd_ctx, NULL, "reset_config", handle_reset_config_command,
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		COMMAND_ANY,
		"[none/trst_only/srst_only/trst_and_srst] [srst_pulls_trst/trst_pulls_srst] [combined/separate] [trst_push_pull/trst_open_drain] [srst_push_pull/srst_open_drain]");
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	register_command(cmd_ctx, NULL, "jtag_nsrst_delay", handle_jtag_nsrst_delay_command,
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		COMMAND_ANY, "jtag_nsrst_delay <ms> - delay after deasserting srst in ms");
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	register_command(cmd_ctx, NULL, "jtag_ntrst_delay", handle_jtag_ntrst_delay_command,
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		COMMAND_ANY, "jtag_ntrst_delay <ms> - delay after deasserting trst in ms");
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	register_command(cmd_ctx, NULL, "scan_chain", handle_scan_chain_command,
		COMMAND_EXEC, "print current scan chain configuration");

	register_command(cmd_ctx, NULL, "jtag_reset", handle_jtag_reset_command,
		COMMAND_EXEC, "toggle reset lines <trst> <srst>");
	register_command(cmd_ctx, NULL, "runtest", handle_runtest_command,
		COMMAND_EXEC, "move to Run-Test/Idle, and execute <num_cycles>");
	register_command(cmd_ctx, NULL, "irscan", handle_irscan_command,
		COMMAND_EXEC, "execute IR scan <device> <instr> [dev2] [instr2] ...");
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	register_jim(cmd_ctx, "drscan", Jim_Command_drscan, "execute DR scan <device> <num_bits> <value> <num_bits1> <value2> ...");
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	register_jim(cmd_ctx, "flush_count", Jim_Command_flush_count, "returns number of times the JTAG queue has been flushed");
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	register_jim(cmd_ctx, "pathmove", Jim_Command_pathmove, "move JTAG to state1 then to state2, state3, etc. <state1>,<state2>,<stat3>...");
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	register_command(cmd_ctx, NULL, "verify_ircapture", handle_verify_ircapture_command,
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		COMMAND_ANY, "verify value captured during Capture-IR <enable | disable>");
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	register_command(cmd_ctx, NULL, "verify_jtag", handle_verify_jtag_command,
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		COMMAND_ANY, "verify value capture <enable | disable>");
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	register_command(cmd_ctx, NULL, "tms_sequence", handle_tms_sequence_command,
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		COMMAND_ANY, "choose short(default) or long tms_sequence <short | long>");
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	return ERROR_OK;
}

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static int default_khz(int khz, int *jtag_speed)
{
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	LOG_ERROR("Translation from khz to jtag_speed not implemented");
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	return ERROR_FAIL;
}

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static int default_speed_div(int speed, int *khz)
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{
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	LOG_ERROR("Translation from jtag_speed to khz not implemented");
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	return ERROR_FAIL;
}

static int default_power_dropout(int *dropout)
{
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	*dropout = 0; /* by default we can't detect power dropout */
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	return ERROR_OK;
}

static int default_srst_asserted(int *srst_asserted)
{
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	*srst_asserted = 0; /* by default we can't detect srst asserted */
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	return ERROR_OK;
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}

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static int handle_interface_command(struct command_context_s *cmd_ctx,
		char *cmd, char **args, int argc)
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{
	/* check whether the interface is already configured */
	if (jtag_interface)
	{
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		LOG_WARNING("Interface already configured, ignoring");
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		return ERROR_OK;
	}

	/* interface name is a mandatory argument */
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	if (argc != 1 || args[0][0] == '\0')
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		return ERROR_COMMAND_SYNTAX_ERROR;

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	for (unsigned i = 0; NULL != jtag_interfaces[i]; i++)
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	{
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		if (strcmp(args[0], jtag_interfaces[i]->name) != 0)
			continue;

		int retval = jtag_interfaces[i]->register_commands(cmd_ctx);
		if (ERROR_OK != retval)
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				return retval;
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		jtag_interface = jtag_interfaces[i];
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		if (jtag_interface->khz == NULL)
			jtag_interface->khz = default_khz;
		if (jtag_interface->speed_div == NULL)
			jtag_interface->speed_div = default_speed_div;
		if (jtag_interface->power_dropout == NULL)
			jtag_interface->power_dropout = default_power_dropout;
		if (jtag_interface->srst_asserted == NULL)
			jtag_interface->srst_asserted = default_srst_asserted;
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		return ERROR_OK;
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	}

	/* no valid interface was found (i.e. the configuration option,
	 * didn't match one of the compiled-in interfaces
	 */
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	LOG_ERROR("The specified JTAG interface was not found (%s)", args[0]);
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	handle_interface_list_command(cmd_ctx, cmd, args, argc);
	return ERROR_JTAG_INVALID_INTERFACE;
}

static int handle_interface_list_command(struct command_context_s *cmd_ctx,
		char *cmd, char **args, int argc)
{
	if (strcmp(cmd, "interface_list") == 0 && argc > 0)
		return ERROR_COMMAND_SYNTAX_ERROR;

	command_print(cmd_ctx, "The following JTAG interfaces are available:");
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	{
		const char *name = jtag_interfaces[i]->name;
		command_print(cmd_ctx, "%u: %s", i + 1, name);
	}
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	return ERROR_OK;
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}

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static int handle_jtag_device_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
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{
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	int e;
	char buf[1024];
	Jim_Obj *newargs[ 10 ];
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	/*
	 * CONVERT SYNTAX
	 * argv[-1] = command
	 * argv[ 0] = ir length
	 * argv[ 1] = ir capture
	 * argv[ 2] = ir mask
	 * argv[ 3] = not actually used by anything but in the docs
	 */
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	if (argc < 4) {
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		command_print(cmd_ctx, "OLD DEPRECATED SYNTAX: Please use the NEW syntax");
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		return ERROR_OK;
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	}
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	command_print(cmd_ctx, "OLD SYNTAX: DEPRECATED - translating to new syntax");
	command_print(cmd_ctx, "jtag newtap CHIP TAP -irlen %s -ircapture %s -irvalue %s",
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				   args[0],
				   args[1],
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				   args[2]);
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	command_print(cmd_ctx, "Example: STM32 has 2 taps, the cortexM3(len4) + boundaryscan(len5)");
	command_print(cmd_ctx, "jtag newtap stm32 cortexm3 ....., thus creating the tap: \"stm32.cortexm3\"");
	command_print(cmd_ctx, "jtag newtap stm32 boundary ....., and the tap: \"stm32.boundary\"");
	command_print(cmd_ctx, "And then refer to the taps by the dotted name.");

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	newargs[0] = Jim_NewStringObj(interp, "jtag", -1);
	newargs[1] = Jim_NewStringObj(interp, "newtap", -1);
	sprintf(buf, "chip%d", jtag_tap_count());
	newargs[2] = Jim_NewStringObj(interp, buf, -1);
	sprintf(buf, "tap%d", jtag_tap_count());
	newargs[3] = Jim_NewStringObj(interp, buf, -1);
	newargs[4] = Jim_NewStringObj(interp, "-irlen", -1);
	newargs[5] = Jim_NewStringObj(interp, args[0], -1);
	newargs[6] = Jim_NewStringObj(interp, "-ircapture", -1);
	newargs[7] = Jim_NewStringObj(interp, args[1], -1);
	newargs[8] = Jim_NewStringObj(interp, "-irmask", -1);
	newargs[9] = Jim_NewStringObj(interp, args[2], -1);
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	command_print(cmd_ctx, "NEW COMMAND:");
	sprintf(buf, "%s %s %s %s %s %s %s %s %s %s",
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			 Jim_GetString(newargs[0], NULL),
			 Jim_GetString(newargs[1], NULL),
			 Jim_GetString(newargs[2], NULL),
			 Jim_GetString(newargs[3], NULL),
			 Jim_GetString(newargs[4], NULL),
			 Jim_GetString(newargs[5], NULL),
			 Jim_GetString(newargs[6], NULL),
			 Jim_GetString(newargs[7], NULL),
			 Jim_GetString(newargs[8], NULL),
			 Jim_GetString(newargs[9], NULL));

	e = jim_jtag_command(interp, 10, newargs);
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	if (e != JIM_OK) {
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		command_print(cmd_ctx, "%s", Jim_GetString(Jim_GetResult(interp), NULL));
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	}
	return e;
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}

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static int handle_scan_chain_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
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{
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	jtag_tap_t *tap;
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	tap = jtag_all_taps();
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	command_print(cmd_ctx, "     TapName            | Enabled |   IdCode      Expected    IrLen IrCap  IrMask Instr     ");
	command_print(cmd_ctx, "---|--------------------|---------|------------|------------|------|------|------|---------");

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	while (tap) {
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		uint32_t expected, expected_mask, cur_instr, ii;
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		expected = buf_get_u32(tap->expected, 0, tap->ir_length);
		expected_mask = buf_get_u32(tap->expected_mask, 0, tap->ir_length);
		cur_instr = buf_get_u32(tap->cur_instr, 0, tap->ir_length);
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		command_print(cmd_ctx,
					  "%2d | %-18s |    %c    | 0x%08x | 0x%08x | 0x%02x | 0x%02x | 0x%02x | 0x%02x",
					  tap->abs_chain_position,
					  tap->dotted_name,
					  tap->enabled ? 'Y' : 'n',
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					  (unsigned int)(tap->idcode),
					  (unsigned int)(tap->expected_ids_cnt > 0 ? tap->expected_ids[0] : 0),
					  (unsigned int)(tap->ir_length),
					  (unsigned int)(expected),
					  (unsigned int)(expected_mask),
					  (unsigned int)(cur_instr));
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		for (ii = 1; ii < tap->expected_ids_cnt; ii++) {
			command_print(cmd_ctx, "   |                    |         |            | 0x%08x |      |      |      |         ",
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						  (unsigned int)(tap->expected_ids[ii]));
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		}

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		tap = tap->next_tap;
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	}

	return ERROR_OK;
}

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static int handle_reset_config_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
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{
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	int new_cfg = 0;
	int mask = 0;

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	if (argc < 1)
		return ERROR_COMMAND_SYNTAX_ERROR;
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	/* Original versions cared about the order of these tokens:
	 *   reset_config signals [combination [trst_type [srst_type]]]
	 * They also clobbered the previous configuration even on error.
	 *
	 * Here we don't care about the order, and only change values
	 * which have been explicitly specified.
	 */
	for (; argc; argc--, args++) {
		int tmp = 0;
		int m;

		/* signals */
		m = RESET_HAS_TRST | RESET_HAS_SRST;
		if (strcmp(*args, "none") == 0)
			tmp = RESET_NONE;
		else if (strcmp(*args, "trst_only") == 0)
			tmp = RESET_HAS_TRST;
		else if (strcmp(*args, "srst_only") == 0)
			tmp = RESET_HAS_SRST;
		else if (strcmp(*args, "trst_and_srst") == 0)
			tmp = RESET_HAS_TRST | RESET_HAS_SRST;
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		else
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			m = 0;
		if (mask & m) {
			LOG_ERROR("extra reset_config %s spec (%s)",
					"signal", *args);
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			return ERROR_INVALID_ARGUMENTS;
		}
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		if (m)
			goto next;

		/* combination (options for broken wiring) */
		m = RESET_SRST_PULLS_TRST | RESET_TRST_PULLS_SRST;
		if (strcmp(*args, "separate") == 0)
			/* separate reset lines - default */;
		else if (strcmp(*args, "srst_pulls_trst") == 0)
			tmp |= RESET_SRST_PULLS_TRST;
		else if (strcmp(*args, "trst_pulls_srst") == 0)
			tmp |= RESET_TRST_PULLS_SRST;
		else if (strcmp(*args, "combined") == 0)
			tmp |= RESET_SRST_PULLS_TRST | RESET_TRST_PULLS_SRST;
		else
			m = 0;
		if (mask & m) {
			LOG_ERROR("extra reset_config %s spec (%s)",
					"combination", *args);
			return ERROR_INVALID_ARGUMENTS;
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		}
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		if (m)
			goto next;

		/* trst_type (NOP without HAS_TRST) */
		m = RESET_TRST_OPEN_DRAIN;
		if (strcmp(*args, "trst_open_drain") == 0)
			tmp |= RESET_TRST_OPEN_DRAIN;
		else if (strcmp(*args, "trst_push_pull") == 0)
			/* push/pull from adapter - default */;
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		else
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			m = 0;
		if (mask & m) {
			LOG_ERROR("extra reset_config %s spec (%s)",
					"trst_type", *args);
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			return ERROR_INVALID_ARGUMENTS;
		}
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		if (m)
			goto next;

		/* srst_type (NOP without HAS_SRST) */
		m |= RESET_SRST_PUSH_PULL;
		if (strcmp(*args, "srst_push_pull") == 0)
			tmp |= RESET_SRST_PUSH_PULL;
		else if (strcmp(*args, "srst_open_drain") == 0)
			/* open drain from adapter - default */;
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		else
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			m = 0;
		if (mask & m) {
			LOG_ERROR("extra reset_config %s spec (%s)",
					"srst_type", *args);
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			return ERROR_INVALID_ARGUMENTS;
		}
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		if (m)
			goto next;

		/* caller provided nonsense; fail */
		LOG_ERROR("unknown reset_config flag (%s)", *args);
		return ERROR_INVALID_ARGUMENTS;

next:
		/* Remember the bits which were specified (mask)
		 * and their new values (new_cfg).
		 */
		mask |= m;
		new_cfg |= tmp;
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	}
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	/* clear previous values of those bits, save new values */
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	enum reset_types old_cfg = jtag_get_reset_config();
	old_cfg &= ~mask;
	new_cfg |= old_cfg;
	jtag_set_reset_config(new_cfg);
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	return ERROR_OK;
}

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static int handle_jtag_nsrst_delay_command(struct command_context_s *cmd_ctx,
		char *cmd, char **args, int argc)
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{
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	if (argc > 1)
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		return ERROR_COMMAND_SYNTAX_ERROR;
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	if (argc == 1)
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	{
		unsigned delay;
		int retval = parse_uint(args[0], &delay);
		if (ERROR_OK != retval)
			return retval;
		jtag_set_nsrst_delay(delay);
	}
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	command_print(cmd_ctx, "jtag_nsrst_delay: %u", jtag_get_nsrst_delay());
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	return ERROR_OK;
}

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static int handle_jtag_ntrst_delay_command(struct command_context_s *cmd_ctx,
		char *cmd, char **args, int argc)
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{
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	if (argc > 1)
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		return ERROR_COMMAND_SYNTAX_ERROR;
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	if (argc == 1)
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	{
		unsigned delay;
		int retval = parse_uint(args[0], &delay);
		if (ERROR_OK != retval)
			return retval;
		jtag_set_ntrst_delay(delay);
	}
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	command_print(cmd_ctx, "jtag_ntrst_delay: %u", jtag_get_ntrst_delay());
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	return ERROR_OK;
}

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static int handle_jtag_speed_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
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{
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	int retval = ERROR_OK;
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	command_print(cmd_ctx, "OLD SYNTAX: DEPRECATED - "
			"use jtag_khz, not jtag_speed");

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	if (argc > 1)
		return ERROR_COMMAND_SYNTAX_ERROR;
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	if (argc == 1)
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	{
		LOG_DEBUG("handle jtag speed");
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		unsigned cur_speed = 0;
		int retval = parse_uint(args[0], &cur_speed);
		if (ERROR_OK != retval)
			return retval;
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		retval = jtag_config_speed(cur_speed);
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	}
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	command_print(cmd_ctx, "jtag_speed: %d", jtag_get_speed());
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	return retval;
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}

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static int handle_jtag_khz_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
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{
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	if (argc > 1)
		return ERROR_COMMAND_SYNTAX_ERROR;
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	int retval = ERROR_OK;
	if (argc == 1)
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	{
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		unsigned khz = 0;
		int retval = parse_uint(args[0], &khz);
		if (ERROR_OK != retval)
			return retval;
		retval = jtag_config_khz(khz);
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		if (ERROR_OK != retval)
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			return retval;
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	}
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	int cur_speed = jtag_get_speed_khz();
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	retval = jtag_get_speed_readable(&cur_speed);
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