src/jtag/adapter.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007-2010 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2009 SoftPLC Corporation                                *
   9  *       http://softplc.com                                                *
  10  *   dick@softplc.com                                                      *
  11  *                                                                         *
  12  *   Copyright (C) 2009 Zachary T Welch                                    *
  13  *   zw@superlucidity.net                                                  *
  14  *                                                                         *
  15  *   This program is free software; you can redistribute it and/or modify  *
  16  *   it under the terms of the GNU General Public License as published by  *
  17  *   the Free Software Foundation; either version 2 of the License, or     *
  18  *   (at your option) any later version.                                   *
  19  *                                                                         *
  20  *   This program is distributed in the hope that it will be useful,       *
  21  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  22  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  23  *   GNU General Public License for more details.                          *
  24  *                                                                         *
  25  *   You should have received a copy of the GNU General Public License     *
  26  *   along with this program; if not, write to the                         *
  27  *   Free Software Foundation, Inc.,                                       *
  28  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  29  ***************************************************************************/
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include "config.h"
  33 #endif
  34
  35 #include "jtag.h"
  36 #include "minidriver.h"
  37 #include "interface.h"
  38 #include "interfaces.h"
  39 #include <transport/transport.h>
  40
  41 #ifdef HAVE_STRINGS_H
  42 #include <strings.h>
  43 #endif
  44
  45 /**
  46  * @file
  47  * Holds support for configuring debug adapters from TCl scripts.
  48  */
  49
  50 extern struct jtag_interface *jtag_interface;
  51 const char *jtag_only[] = { "jtag", NULL };
  52
  53 static int jim_adapter_name(Jim_Interp *interp, int argc, Jim_Obj * const *argv)
  54 {
  55         Jim_GetOptInfo goi;
  56         Jim_GetOpt_Setup(&goi, interp, argc-1, argv + 1);
  57
  58         /* return the name of the interface */
  59         /* TCL code might need to know the exact type... */
  60         /* FUTURE: we allow this as a means to "set" the interface. */
  61         if (goi.argc != 0) {
  62                 Jim_WrongNumArgs(goi.interp, 1, goi.argv-1, "(no params)");
  63                 return JIM_ERR;
  64         }
  65         const char *name = jtag_interface ? jtag_interface->name : NULL;
  66         Jim_SetResultString(goi.interp, name ? : "undefined", -1);
  67         return JIM_OK;
  68 }
  69
  70 static int default_khz(int khz, int *jtag_speed)
  71 {
  72         LOG_ERROR("Translation from khz to jtag_speed not implemented");
  73         return ERROR_FAIL;
  74 }
  75
  76 static int default_speed_div(int speed, int *khz)
  77 {
  78         LOG_ERROR("Translation from jtag_speed to khz not implemented");
  79         return ERROR_FAIL;
  80 }
  81
  82 static int default_power_dropout(int *dropout)
  83 {
  84         *dropout = 0; /* by default we can't detect power dropout */
  85         return ERROR_OK;
  86 }
  87
  88 static int default_srst_asserted(int *srst_asserted)
  89 {
  90         *srst_asserted = 0; /* by default we can't detect srst asserted */
  91         return ERROR_OK;
  92 }
  93
  94 COMMAND_HANDLER(interface_transport_command)
  95 {
  96         char **transports;
  97         int retval;
  98
  99         retval = CALL_COMMAND_HANDLER(transport_list_parse, &transports);
 100         if (retval != ERROR_OK)
 101                 return retval;
 102
 103         retval = allow_transports(CMD_CTX, (const char **)transports);
 104
 105         if (retval != ERROR_OK) {
 106                 for (unsigned i = 0; transports[i]; i++)
 107                         free(transports[i]);
 108                 free(transports);
 109         }
 110         return retval;
 111 }
 112
 113 COMMAND_HANDLER(handle_interface_list_command)
 114 {
 115         if (strcmp(CMD_NAME, "interface_list") == 0 && CMD_ARGC > 0)
 116                 return ERROR_COMMAND_SYNTAX_ERROR;
 117
 118         command_print(CMD_CTX, "The following debug interfaces are available:");
 119         for (unsigned i = 0; NULL != jtag_interfaces[i]; i++) {
 120                 const char *name = jtag_interfaces[i]->name;
 121                 command_print(CMD_CTX, "%u: %s", i + 1, name);
 122         }
 123
 124         return ERROR_OK;
 125 }
 126
 127 COMMAND_HANDLER(handle_interface_command)
 128 {
 129         int retval;
 130
 131         /* check whether the interface is already configured */
 132         if (jtag_interface) {
 133                 LOG_WARNING("Interface already configured, ignoring");
 134                 return ERROR_OK;
 135         }
 136
 137         /* interface name is a mandatory argument */
 138         if (CMD_ARGC != 1 || CMD_ARGV[0][0] == '\0')
 139                 return ERROR_COMMAND_SYNTAX_ERROR;
 140
 141         for (unsigned i = 0; NULL != jtag_interfaces[i]; i++) {
 142                 if (strcmp(CMD_ARGV[0], jtag_interfaces[i]->name) != 0)
 143                         continue;
 144
 145                 if (NULL != jtag_interfaces[i]->commands) {
 146                         retval = register_commands(CMD_CTX, NULL,
 147                                         jtag_interfaces[i]->commands);
 148                         if (ERROR_OK != retval)
 149                                 return retval;
 150                 }
 151
 152                 jtag_interface = jtag_interfaces[i];
 153
 154         /* LEGACY SUPPORT ... adapter drivers  must declare what
 155          * transports they allow.  Until they all do so, assume
 156          * the legacy drivers are JTAG-only
 157          */
 158         if (!jtag_interface->transports)
 159                 LOG_WARNING("Adapter driver '%s' did not declare "
 160                         "which transports it allows; assuming "
 161                         "legacy JTAG-only", jtag_interface->name);
 162                 retval = allow_transports(CMD_CTX, jtag_interface->transports
 163                                                 ? jtag_interface->transports : jtag_only);
 164                         if (ERROR_OK != retval)
 165                                 return retval;
 166
 167                 if (jtag_interface->khz == NULL)
 168                         jtag_interface->khz = default_khz;
 169                 if (jtag_interface->speed_div == NULL)
 170                         jtag_interface->speed_div = default_speed_div;
 171                 if (jtag_interface->power_dropout == NULL)
 172                         jtag_interface->power_dropout = default_power_dropout;
 173                 if (jtag_interface->srst_asserted == NULL)
 174                         jtag_interface->srst_asserted = default_srst_asserted;
 175
 176                 return ERROR_OK;
 177         }
 178
 179         /* no valid interface was found (i.e. the configuration option,
 180          * didn't match one of the compiled-in interfaces
 181          */
 182         LOG_ERROR("The specified debug interface was not found (%s)",
 183                                 CMD_ARGV[0]);
 184         CALL_COMMAND_HANDLER(handle_interface_list_command);
 185         return ERROR_JTAG_INVALID_INTERFACE;
 186 }
 187
 188 COMMAND_HANDLER(handle_reset_config_command)
 189 {
 190         int new_cfg = 0;
 191         int mask = 0;
 192
 193         /* Original versions cared about the order of these tokens:
 194          *   reset_config signals [combination [trst_type [srst_type]]]
 195          * They also clobbered the previous configuration even on error.
 196          *
 197          * Here we don't care about the order, and only change values
 198          * which have been explicitly specified.
 199          */
 200         for (; CMD_ARGC; CMD_ARGC--, CMD_ARGV++) {
 201                 int tmp = 0;
 202                 int m;
 203
 204                 /* gating */
 205                 m = RESET_SRST_NO_GATING;
 206                 if (strcmp(*CMD_ARGV, "srst_gates_jtag") == 0)
 207                         /* default: don't use JTAG while SRST asserted */;
 208                 else if (strcmp(*CMD_ARGV, "srst_nogate") == 0)
 209                         tmp = RESET_SRST_NO_GATING;
 210                 else
 211                         m = 0;
 212                 if (mask & m) {
 213                         LOG_ERROR("extra reset_config %s spec (%s)",
 214                                         "gating", *CMD_ARGV);
 215                         return ERROR_COMMAND_SYNTAX_ERROR;
 216                 }
 217                 if (m)
 218                         goto next;
 219
 220                 /* signals */
 221                 m = RESET_HAS_TRST | RESET_HAS_SRST;
 222                 if (strcmp(*CMD_ARGV, "none") == 0)
 223                         tmp = RESET_NONE;
 224                 else if (strcmp(*CMD_ARGV, "trst_only") == 0)
 225                         tmp = RESET_HAS_TRST;
 226                 else if (strcmp(*CMD_ARGV, "srst_only") == 0)
 227                         tmp = RESET_HAS_SRST;
 228                 else if (strcmp(*CMD_ARGV, "trst_and_srst") == 0)
 229                         tmp = RESET_HAS_TRST | RESET_HAS_SRST;
 230                 else
 231                         m = 0;
 232                 if (mask & m) {
 233                         LOG_ERROR("extra reset_config %s spec (%s)",
 234                                         "signal", *CMD_ARGV);
 235                         return ERROR_COMMAND_SYNTAX_ERROR;
 236                 }
 237                 if (m)
 238                         goto next;
 239
 240                 /* combination (options for broken wiring) */
 241                 m = RESET_SRST_PULLS_TRST | RESET_TRST_PULLS_SRST;
 242                 if (strcmp(*CMD_ARGV, "separate") == 0)
 243                         /* separate reset lines - default */;
 244                 else if (strcmp(*CMD_ARGV, "srst_pulls_trst") == 0)
 245                         tmp |= RESET_SRST_PULLS_TRST;
 246                 else if (strcmp(*CMD_ARGV, "trst_pulls_srst") == 0)
 247                         tmp |= RESET_TRST_PULLS_SRST;
 248                 else if (strcmp(*CMD_ARGV, "combined") == 0)
 249                         tmp |= RESET_SRST_PULLS_TRST | RESET_TRST_PULLS_SRST;
 250                 else
 251                         m = 0;
 252                 if (mask & m) {
 253                         LOG_ERROR("extra reset_config %s spec (%s)",
 254                                         "combination", *CMD_ARGV);
 255                         return ERROR_COMMAND_SYNTAX_ERROR;
 256                 }
 257                 if (m)
 258                         goto next;
 259
 260                 /* trst_type (NOP without HAS_TRST) */
 261                 m = RESET_TRST_OPEN_DRAIN;
 262                 if (strcmp(*CMD_ARGV, "trst_open_drain") == 0)
 263                         tmp |= RESET_TRST_OPEN_DRAIN;
 264                 else if (strcmp(*CMD_ARGV, "trst_push_pull") == 0)
 265                         /* push/pull from adapter - default */;
 266                 else
 267                         m = 0;
 268                 if (mask & m) {
 269                         LOG_ERROR("extra reset_config %s spec (%s)",
 270                                         "trst_type", *CMD_ARGV);
 271                         return ERROR_COMMAND_SYNTAX_ERROR;
 272                 }
 273                 if (m)
 274                         goto next;
 275
 276                 /* srst_type (NOP without HAS_SRST) */
 277                 m |= RESET_SRST_PUSH_PULL;
 278                 if (strcmp(*CMD_ARGV, "srst_push_pull") == 0)
 279                         tmp |= RESET_SRST_PUSH_PULL;
 280                 else if (strcmp(*CMD_ARGV, "srst_open_drain") == 0)
 281                         /* open drain from adapter - default */;
 282                 else
 283                         m = 0;
 284                 if (mask & m) {
 285                         LOG_ERROR("extra reset_config %s spec (%s)",
 286                                         "srst_type", *CMD_ARGV);
 287                         return ERROR_COMMAND_SYNTAX_ERROR;
 288                 }
 289                 if (m)
 290                         goto next;
 291
 292                 /* caller provided nonsense; fail */
 293                 LOG_ERROR("unknown reset_config flag (%s)", *CMD_ARGV);
 294                 return ERROR_COMMAND_SYNTAX_ERROR;
 295
 296 next:
 297                 /* Remember the bits which were specified (mask)
 298                  * and their new values (new_cfg).
 299                  */
 300                 mask |= m;
 301                 new_cfg |= tmp;
 302         }
 303
 304         /* clear previous values of those bits, save new values */
 305         if (mask) {
 306                 int old_cfg = jtag_get_reset_config();
 307
 308                 old_cfg &= ~mask;
 309                 new_cfg |= old_cfg;
 310                 jtag_set_reset_config(new_cfg);
 311         } else
 312                 new_cfg = jtag_get_reset_config();
 313
 314
 315         /*
 316          * Display the (now-)current reset mode
 317          */
 318         char *modes[5];
 319
 320         /* minimal JTAG has neither SRST nor TRST (so that's the default) */
 321         switch (new_cfg & (RESET_HAS_TRST | RESET_HAS_SRST)) {
 322                 case RESET_HAS_SRST:
 323                         modes[0] = "srst_only";
 324                         break;
 325                 case RESET_HAS_TRST:
 326                         modes[0] = "trst_only";
 327                         break;
 328                 case RESET_TRST_AND_SRST:
 329                         modes[0] = "trst_and_srst";
 330                         break;
 331                 default:
 332                         modes[0] = "none";
 333                         break;
 334         }
 335
 336         /* normally SRST and TRST are decoupled; but bugs happen ... */
 337         switch (new_cfg & (RESET_SRST_PULLS_TRST | RESET_TRST_PULLS_SRST)) {
 338                 case RESET_SRST_PULLS_TRST:
 339                         modes[1] = "srst_pulls_trst";
 340                         break;
 341                 case RESET_TRST_PULLS_SRST:
 342                         modes[1] = "trst_pulls_srst";
 343                         break;
 344                 case RESET_SRST_PULLS_TRST | RESET_TRST_PULLS_SRST:
 345                         modes[1] = "combined";
 346                         break;
 347                 default:
 348                         modes[1] = "separate";
 349                         break;
 350         }
 351
 352         /* TRST-less connectors include Altera, Xilinx, and minimal JTAG */
 353         if (new_cfg & RESET_HAS_TRST) {
 354                 if (new_cfg & RESET_TRST_OPEN_DRAIN)
 355                         modes[3] = " trst_open_drain";
 356                 else
 357                         modes[3] = " trst_push_pull";
 358         } else
 359                 modes[3] = "";
 360
 361         /* SRST-less connectors include TI-14, Xilinx, and minimal JTAG */
 362         if (new_cfg & RESET_HAS_SRST) {
 363                 if (new_cfg & RESET_SRST_NO_GATING)
 364                         modes[2] = " srst_nogate";
 365                 else
 366                         modes[2] = " srst_gates_jtag";
 367
 368                 if (new_cfg & RESET_SRST_PUSH_PULL)
 369                         modes[4] = " srst_push_pull";
 370                 else
 371                         modes[4] = " srst_open_drain";
 372         } else {
 373                 modes[2] = "";
 374                 modes[4] = "";
 375         }
 376
 377         command_print(CMD_CTX, "%s %s%s%s%s",
 378                         modes[0], modes[1],
 379                         modes[2], modes[3], modes[4]);
 380
 381         return ERROR_OK;
 382 }
 383
 384 COMMAND_HANDLER(handle_adapter_nsrst_delay_command)
 385 {
 386         if (CMD_ARGC > 1)
 387                 return ERROR_COMMAND_SYNTAX_ERROR;
 388         if (CMD_ARGC == 1) {
 389                 unsigned delay;
 390                 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], delay);
 391
 392                 jtag_set_nsrst_delay(delay);
 393         }
 394         command_print(CMD_CTX, "adapter_nsrst_delay: %u", jtag_get_nsrst_delay());
 395         return ERROR_OK;
 396 }
 397
 398 COMMAND_HANDLER(handle_adapter_nsrst_assert_width_command)
 399 {
 400         if (CMD_ARGC > 1)
 401                 return ERROR_COMMAND_SYNTAX_ERROR;
 402         if (CMD_ARGC == 1) {
 403                 unsigned width;
 404                 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], width);
 405
 406                 jtag_set_nsrst_assert_width(width);
 407         }
 408         command_print(CMD_CTX, "adapter_nsrst_assert_width: %u", jtag_get_nsrst_assert_width());
 409         return ERROR_OK;
 410 }
 411
 412
 413
 414 COMMAND_HANDLER(handle_adapter_khz_command)
 415 {
 416         if (CMD_ARGC > 1)
 417                 return ERROR_COMMAND_SYNTAX_ERROR;
 418
 419         int retval = ERROR_OK;
 420         if (CMD_ARGC == 1) {
 421                 unsigned khz = 0;
 422                 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], khz);
 423
 424                 retval = jtag_config_khz(khz);
 425                 if (ERROR_OK != retval)
 426                         return retval;
 427         }
 428
 429         int cur_speed = jtag_get_speed_khz();
 430         retval = jtag_get_speed_readable(&cur_speed);
 431         if (ERROR_OK != retval)
 432                 return retval;
 433
 434         if (cur_speed)
 435                 command_print(CMD_CTX, "adapter speed: %d kHz", cur_speed);
 436         else
 437                 command_print(CMD_CTX, "adapter speed: RCLK - adaptive");
 438
 439         return retval;
 440 }
 441
 442 static const struct command_registration interface_command_handlers[] = {
 443         {
 444                 .name = "adapter_khz",
 445                 .handler = handle_adapter_khz_command,
 446                 .mode = COMMAND_ANY,
 447                 .help = "With an argument, change to the specified maximum "
 448                         "jtag speed.  For JTAG, 0 KHz signifies adaptive "
 449                         " clocking. "
 450                         "With or without argument, display current setting.",
 451                 .usage = "[khz]",
 452         },
 453         {
 454                 .name = "adapter_name",
 455                 .mode = COMMAND_ANY,
 456                 .jim_handler = jim_adapter_name,
 457                 .help = "Returns the name of the currently "
 458                         "selected adapter (driver)",
 459         },
 460         {
 461                 .name = "adapter_nsrst_delay",
 462                 .handler = handle_adapter_nsrst_delay_command,
 463                 .mode = COMMAND_ANY,
 464                 .help = "delay after deasserting SRST in ms",
 465                 .usage = "[milliseconds]",
 466         },
 467         {
 468                 .name = "adapter_nsrst_assert_width",
 469                 .handler = handle_adapter_nsrst_assert_width_command,
 470                 .mode = COMMAND_ANY,
 471                 .help = "delay after asserting SRST in ms",
 472                 .usage = "[milliseconds]",
 473         },
 474         {
 475                 .name = "interface",
 476                 .handler = handle_interface_command,
 477                 .mode = COMMAND_CONFIG,
 478                 .help = "Select a debug adapter interface (driver)",
 479                 .usage = "driver_name",
 480         },
 481         {
 482                 .name = "interface_transports",
 483                 .handler = interface_transport_command,
 484                 .mode = COMMAND_CONFIG,
 485                 .help = "Declare transports the interface supports.",
 486                 .usage = "transport ... ",
 487         },
 488         {
 489                 .name = "interface_list",
 490                 .handler = handle_interface_list_command,
 491                 .mode = COMMAND_ANY,
 492                 .help = "List all built-in debug adapter interfaces (drivers)",
 493         },
 494         {
 495                 .name = "reset_config",
 496                 .handler = handle_reset_config_command,
 497                 .mode = COMMAND_ANY,
 498                 .help = "configure adapter reset behavior",
 499                 .usage = "[none|trst_only|srst_only|trst_and_srst] "
 500                         "[srst_pulls_trst|trst_pulls_srst|combined|separate] "
 501                         "[srst_gates_jtag|srst_nogate] "
 502                         "[trst_push_pull|trst_open_drain] "
 503                         "[srst_push_pull|srst_open_drain]",
 504         },
 505         COMMAND_REGISTRATION_DONE
 506 };
 507
 508 /**
 509  * Register the commands which deal with arbitrary debug adapter drivers.
 510  *
 511  * @todo Remove internal assumptions that all debug adapters use JTAG for
 512  * transport.  Various types and data structures are not named generically.
 513  */
 514 int interface_register_commands(struct command_context *ctx)
 515 {
 516         return register_commands(ctx, NULL, interface_command_handlers);
 517 }