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   1 /***************************************************************************
   2  *   Copyright (C) 2009-2010 by Simon Qian <SimonQian@SimonQian.com>       *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  18  ***************************************************************************/
  19
  20 /* Versaloon is a programming tool for multiple MCUs.
  21  * It's distributed under GPLv3.
  22  * You can find it at http://www.Versaloon.com/.
  23  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <jtag/interface.h>
  30 #include <jtag/commands.h>
  31 #include "usb_common.h"
  32
  33 #include "versaloon/versaloon_include.h"
  34 #include "versaloon/versaloon.h"
  35
  36 static int vsllink_tms_offset;
  37
  38 struct pending_scan_result {
  39         int src_offset;
  40         int dest_offset;
  41         int length;     /* Number of bits to read */
  42         struct scan_command *command;   /* Corresponding scan command */
  43         uint8_t *ack;
  44         uint8_t *buffer;
  45         bool last;      /* indicate the last scan pending */
  46 };
  47
  48 #define MAX_PENDING_SCAN_RESULTS 256
  49
  50 static int pending_scan_results_length;
  51 static struct pending_scan_result
  52         pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
  53
  54 /* Queue command functions */
  55 static void vsllink_end_state(tap_state_t state);
  56 static void vsllink_state_move(void);
  57 static void vsllink_path_move(int num_states, tap_state_t *path);
  58 static void vsllink_tms(int num_bits, const uint8_t *bits);
  59 static void vsllink_runtest(int num_cycles);
  60 static void vsllink_stableclocks(int num_cycles, int tms);
  61 static void vsllink_scan(bool ir_scan, enum scan_type type,
  62                 uint8_t *buffer, int scan_size, struct scan_command *command);
  63 static void vsllink_reset(int trst, int srst);
  64
  65 /* VSLLink tap buffer functions */
  66 static void vsllink_tap_append_step(int tms, int tdi);
  67 static void vsllink_tap_init(void);
  68 static int  vsllink_tap_execute(void);
  69 static void vsllink_tap_ensure_pending(int scans);
  70 static void vsllink_tap_append_scan(int length, uint8_t *buffer,
  71                 struct scan_command *command);
  72
  73 /* VSLLink lowlevel functions */
  74 struct vsllink {
  75         struct usb_dev_handle *usb_handle;
  76 };
  77
  78 static struct vsllink *vsllink_usb_open(void);
  79 static void vsllink_usb_close(struct vsllink *vsllink);
  80
  81 #if defined _DEBUG_JTAG_IO_
  82 static void vsllink_debug_buffer(uint8_t *buffer, int length);
  83 #endif
  84
  85 static int tap_length;
  86 static int tap_buffer_size;
  87 static uint8_t *tms_buffer;
  88 static uint8_t *tdi_buffer;
  89 static uint8_t *tdo_buffer;
  90
  91 struct vsllink *vsllink_handle;
  92
  93 static int vsllink_execute_queue(void)
  94 {
  95         struct jtag_command *cmd = jtag_command_queue;
  96         int scan_size;
  97         enum scan_type type;
  98         uint8_t *buffer;
  99
 100         DEBUG_JTAG_IO("-------------------------------------"
 101                 " vsllink "
 102                 "-------------------------------------");
 103
 104         while (cmd != NULL) {
 105                 switch (cmd->type) {
 106                         case JTAG_RUNTEST:
 107                                 DEBUG_JTAG_IO("runtest %i cycles, end in %s",
 108                                                 cmd->cmd.runtest->num_cycles,
 109                                                 tap_state_name(cmd->cmd.runtest->end_state));
 110
 111                                 vsllink_end_state(cmd->cmd.runtest->end_state);
 112                                 vsllink_runtest(cmd->cmd.runtest->num_cycles);
 113                                 break;
 114
 115                         case JTAG_TLR_RESET:
 116                                 DEBUG_JTAG_IO("statemove end in %s",
 117                                                 tap_state_name(cmd->cmd.statemove->end_state));
 118
 119                                 vsllink_end_state(cmd->cmd.statemove->end_state);
 120                                 vsllink_state_move();
 121                                 break;
 122
 123                         case JTAG_PATHMOVE:
 124                                 DEBUG_JTAG_IO("pathmove: %i states, end in %s",
 125                                                 cmd->cmd.pathmove->num_states,
 126                                                 tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
 127
 128                                 vsllink_path_move(cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path);
 129                                 break;
 130
 131                         case JTAG_SCAN:
 132                                 DEBUG_JTAG_IO("JTAG Scan...");
 133
 134                                 vsllink_end_state(cmd->cmd.scan->end_state);
 135
 136                                 scan_size = jtag_build_buffer(
 137                                                 cmd->cmd.scan, &buffer);
 138
 139                                 if (cmd->cmd.scan->ir_scan)
 140                                         DEBUG_JTAG_IO(
 141                                                         "JTAG Scan write IR(%d bits), "
 142                                                         "end in %s:",
 143                                                         scan_size,
 144                                                         tap_state_name(cmd->cmd.scan->end_state));
 145
 146                                 else
 147                                         DEBUG_JTAG_IO(
 148                                                         "JTAG Scan write DR(%d bits), "
 149                                                         "end in %s:",
 150                                                         scan_size,
 151                                                         tap_state_name(cmd->cmd.scan->end_state));
 152
 153 #ifdef _DEBUG_JTAG_IO_
 154                                 vsllink_debug_buffer(buffer,
 155                                                 DIV_ROUND_UP(scan_size, 8));
 156 #endif
 157
 158                                 type = jtag_scan_type(cmd->cmd.scan);
 159
 160                                 vsllink_scan(cmd->cmd.scan->ir_scan,
 161                                                 type, buffer, scan_size,
 162                                                 cmd->cmd.scan);
 163                                 break;
 164
 165                         case JTAG_RESET:
 166                                 DEBUG_JTAG_IO("reset trst: %i srst %i",
 167                                                 cmd->cmd.reset->trst,
 168                                                 cmd->cmd.reset->srst);
 169
 170                                 vsllink_tap_execute();
 171
 172                                 if (cmd->cmd.reset->trst == 1)
 173                                         tap_set_state(TAP_RESET);
 174
 175                                 vsllink_reset(cmd->cmd.reset->trst,
 176                                                 cmd->cmd.reset->srst);
 177                                 break;
 178
 179                         case JTAG_SLEEP:
 180                                 DEBUG_JTAG_IO("sleep %i", cmd->cmd.sleep->us);
 181                                 vsllink_tap_execute();
 182                                 jtag_sleep(cmd->cmd.sleep->us);
 183                                 break;
 184
 185                         case JTAG_STABLECLOCKS:
 186                                 DEBUG_JTAG_IO("add %d clocks",
 187                                                 cmd->cmd.stableclocks->num_cycles);
 188
 189                                 switch (tap_get_state()) {
 190                                 case TAP_RESET:
 191                                         /* tms must be '1' to stay
 192                                          * n TAP_RESET mode
 193                                          */
 194                                         scan_size = 1;
 195                                         break;
 196                                 case TAP_DRSHIFT:
 197                                 case TAP_IDLE:
 198                                 case TAP_DRPAUSE:
 199                                 case TAP_IRSHIFT:
 200                                 case TAP_IRPAUSE:
 201                                         /* else, tms should be '0' */
 202                                         scan_size = 0;
 203                                         break;
 204                                 /* above stable states are OK */
 205                                 default:
 206                                         LOG_ERROR("jtag_add_clocks() "
 207                                                         "in non-stable state \"%s\"",
 208                                                         tap_state_name(tap_get_state())
 209                                         );
 210                                         exit(-1);
 211                                 }
 212                                 vsllink_stableclocks(cmd->cmd.stableclocks->num_cycles, scan_size);
 213                                 break;
 214
 215                                 case JTAG_TMS:
 216                                         DEBUG_JTAG_IO("add %d jtag tms",
 217                                                         cmd->cmd.tms->num_bits);
 218
 219                                         vsllink_tms(cmd->cmd.tms->num_bits, cmd->cmd.tms->bits);
 220                                         break;
 221
 222                                 default:
 223                                         LOG_ERROR("BUG: unknown JTAG command type "
 224                                                         "encountered: %d", cmd->type);
 225                                         exit(-1);
 226                 }
 227                 cmd = cmd->next;
 228         }
 229
 230         return vsllink_tap_execute();
 231 }
 232
 233 static int vsllink_speed(int speed)
 234 {
 235         versaloon_interface.adaptors.jtag_raw.config(0, (uint16_t)speed);
 236         return versaloon_interface.adaptors.peripheral_commit();
 237 }
 238
 239 static int vsllink_khz(int khz, int *jtag_speed)
 240 {
 241         *jtag_speed = khz;
 242
 243         return ERROR_OK;
 244 }
 245
 246 static int vsllink_speed_div(int jtag_speed, int *khz)
 247 {
 248         *khz = jtag_speed;
 249
 250         return ERROR_OK;
 251 }
 252
 253 static void vsllink_free_buffer(void)
 254 {
 255         if (tdi_buffer != NULL) {
 256                 free(tdi_buffer);
 257                 tdi_buffer = NULL;
 258         }
 259         if (tdo_buffer != NULL) {
 260                 free(tdo_buffer);
 261                 tdo_buffer = NULL;
 262         }
 263         if (tms_buffer != NULL) {
 264                 free(tms_buffer);
 265                 tms_buffer = NULL;
 266         }
 267 }
 268
 269 static int vsllink_quit(void)
 270 {
 271         versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
 272                 0, 0, GPIO_SRST | GPIO_TRST);
 273         versaloon_interface.adaptors.gpio.fini(0);
 274         versaloon_interface.adaptors.jtag_raw.fini(0);
 275         versaloon_interface.adaptors.peripheral_commit();
 276         versaloon_interface.fini();
 277
 278         vsllink_free_buffer();
 279         vsllink_usb_close(vsllink_handle);
 280
 281         return ERROR_OK;
 282 }
 283
 284 static int vsllink_init(void)
 285 {
 286         vsllink_handle = vsllink_usb_open();
 287         if (vsllink_handle == 0) {
 288                 LOG_ERROR("Can't find USB JTAG Interface!" \
 289                         "Please check connection and permissions.");
 290                 return ERROR_JTAG_INIT_FAILED;
 291         }
 292         LOG_DEBUG("vsllink found on %04X:%04X",
 293                 versaloon_interface.usb_setting.vid,
 294                 versaloon_interface.usb_setting.pid);
 295         versaloon_usb_device_handle = vsllink_handle->usb_handle;
 296
 297         if (ERROR_OK != versaloon_interface.init())
 298                 return ERROR_FAIL;
 299         if (versaloon_interface.usb_setting.buf_size < 32) {
 300                 versaloon_interface.fini();
 301                 return ERROR_FAIL;
 302         }
 303
 304         /* malloc buffer size for tap */
 305         tap_buffer_size = versaloon_interface.usb_setting.buf_size / 2 - 32;
 306         vsllink_free_buffer();
 307         tdi_buffer = malloc(tap_buffer_size);
 308         tdo_buffer = malloc(tap_buffer_size);
 309         tms_buffer = malloc(tap_buffer_size);
 310         if ((NULL == tdi_buffer) || (NULL == tdo_buffer) || (NULL == tms_buffer)) {
 311                 vsllink_quit();
 312                 return ERROR_FAIL;
 313         }
 314
 315         versaloon_interface.adaptors.jtag_raw.init(0);
 316         versaloon_interface.adaptors.jtag_raw.config(0, jtag_get_speed_khz());
 317         versaloon_interface.adaptors.gpio.init(0);
 318         versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
 319                 GPIO_TRST, GPIO_SRST, GPIO_SRST);
 320         if (ERROR_OK != versaloon_interface.adaptors.peripheral_commit())
 321                 return ERROR_FAIL;
 322
 323         vsllink_reset(0, 0);
 324         vsllink_tap_init();
 325         return ERROR_OK;
 326 }
 327
 328 /**************************************************************************
 329  * Queue command implementations */
 330
 331 static void vsllink_end_state(tap_state_t state)
 332 {
 333         if (tap_is_state_stable(state))
 334                 tap_set_end_state(state);
 335         else {
 336                 LOG_ERROR("BUG: %i is not a valid end state", state);
 337                 exit(-1);
 338         }
 339 }
 340
 341 /* Goes to the end state. */
 342 static void vsllink_state_move(void)
 343 {
 344         int i;
 345         uint8_t tms_scan = tap_get_tms_path(tap_get_state(),
 346                         tap_get_end_state());
 347         uint8_t tms_scan_bits = tap_get_tms_path_len(tap_get_state(),
 348                         tap_get_end_state());
 349
 350         for (i = 0; i < tms_scan_bits; i++)
 351                 vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 352
 353         tap_set_state(tap_get_end_state());
 354 }
 355
 356 static void vsllink_path_move(int num_states, tap_state_t *path)
 357 {
 358         for (int i = 0; i < num_states; i++) {
 359                 if (path[i] == tap_state_transition(tap_get_state(), false))
 360                         vsllink_tap_append_step(0, 0);
 361                 else if (path[i] == tap_state_transition(tap_get_state(), true))
 362                         vsllink_tap_append_step(1, 0);
 363                 else {
 364                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 365                                 tap_state_name(tap_get_state()),
 366                                 tap_state_name(path[i]));
 367                         exit(-1);
 368                 }
 369
 370                 tap_set_state(path[i]);
 371         }
 372
 373         tap_set_end_state(tap_get_state());
 374 }
 375
 376 static void vsllink_tms(int num_bits, const uint8_t *bits)
 377 {
 378         for (int i = 0; i < num_bits; i++)
 379                 vsllink_tap_append_step((bits[i / 8] >> (i % 8)) & 1, 0);
 380 }
 381
 382 static void vsllink_stableclocks(int num_cycles, int tms)
 383 {
 384         while (num_cycles > 0) {
 385                 vsllink_tap_append_step(tms, 0);
 386                 num_cycles--;
 387         }
 388 }
 389
 390 static void vsllink_runtest(int num_cycles)
 391 {
 392         tap_state_t saved_end_state = tap_get_end_state();
 393
 394         if (tap_get_state() != TAP_IDLE) {
 395                 /* enter IDLE state */
 396                 vsllink_end_state(TAP_IDLE);
 397                 vsllink_state_move();
 398         }
 399
 400         vsllink_stableclocks(num_cycles, 0);
 401
 402         /* post-process */
 403         /* set end_state */
 404         vsllink_end_state(saved_end_state);
 405         if (tap_get_end_state() != tap_get_end_state())
 406                 vsllink_state_move();
 407 }
 408
 409 static void vsllink_scan(bool ir_scan, enum scan_type type, uint8_t *buffer,
 410         int scan_size, struct scan_command *command)
 411 {
 412         tap_state_t saved_end_state;
 413
 414         saved_end_state = tap_get_end_state();
 415
 416         /* Move to appropriate scan state */
 417         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
 418
 419         if (tap_get_state() != tap_get_end_state())
 420                 vsllink_state_move();
 421         vsllink_end_state(saved_end_state);
 422
 423         /* Scan */
 424         vsllink_tap_append_scan(scan_size, buffer, command);
 425
 426         /* Goto Pause and record position to insert tms:0 */
 427         vsllink_tap_append_step(0, 0);
 428         vsllink_tms_offset = tap_length;
 429
 430         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
 431
 432         if (tap_get_state() != tap_get_end_state())
 433                 vsllink_state_move();
 434 }
 435
 436 static void vsllink_reset(int trst, int srst)
 437 {
 438         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
 439
 440         if (!srst)
 441                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, 0, GPIO_SRST, GPIO_SRST);
 442         else
 443                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, GPIO_SRST, 0, 0);
 444
 445         if (!trst)
 446                 versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, GPIO_TRST);
 447         else
 448                 versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, 0);
 449         versaloon_interface.adaptors.peripheral_commit();
 450 }
 451
 452 COMMAND_HANDLER(vsllink_handle_usb_vid_command)
 453 {
 454         if (CMD_ARGC != 1)
 455                 return ERROR_COMMAND_SYNTAX_ERROR;
 456
 457         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0],
 458                 versaloon_interface.usb_setting.vid);
 459         return ERROR_OK;
 460 }
 461
 462 COMMAND_HANDLER(vsllink_handle_usb_pid_command)
 463 {
 464         if (CMD_ARGC != 1)
 465                 return ERROR_COMMAND_SYNTAX_ERROR;
 466         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0],
 467                 versaloon_interface.usb_setting.pid);
 468         return ERROR_OK;
 469 }
 470
 471 COMMAND_HANDLER(vsllink_handle_usb_serial_command)
 472 {
 473         if (CMD_ARGC > 1)
 474                 return ERROR_COMMAND_SYNTAX_ERROR;
 475
 476         free(versaloon_interface.usb_setting.serialstring);
 477
 478         if (CMD_ARGC == 1)
 479                 versaloon_interface.usb_setting.serialstring = strdup(CMD_ARGV[0]);
 480         else
 481                 versaloon_interface.usb_setting.serialstring = NULL;
 482
 483         return ERROR_OK;
 484 }
 485
 486 COMMAND_HANDLER(vsllink_handle_usb_bulkin_command)
 487 {
 488         if (CMD_ARGC != 1)
 489                 return ERROR_COMMAND_SYNTAX_ERROR;
 490
 491         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 492                 versaloon_interface.usb_setting.ep_in);
 493
 494         versaloon_interface.usb_setting.ep_in |= 0x80;
 495
 496         return ERROR_OK;
 497 }
 498
 499 COMMAND_HANDLER(vsllink_handle_usb_bulkout_command)
 500 {
 501         if (CMD_ARGC != 1)
 502                 return ERROR_COMMAND_SYNTAX_ERROR;
 503
 504         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 505                 versaloon_interface.usb_setting.ep_out);
 506
 507         versaloon_interface.usb_setting.ep_out &= ~0x80;
 508
 509         return ERROR_OK;
 510 }
 511
 512 COMMAND_HANDLER(vsllink_handle_usb_interface_command)
 513 {
 514         if (CMD_ARGC != 1)
 515                 return ERROR_COMMAND_SYNTAX_ERROR;
 516
 517         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 518                 versaloon_interface.usb_setting.interface);
 519         return ERROR_OK;
 520 }
 521
 522 /**************************************************************************
 523  * VSLLink tap functions */
 524
 525 static void vsllink_tap_init(void)
 526 {
 527         tap_length = 0;
 528         pending_scan_results_length = 0;
 529         vsllink_tms_offset = 0;
 530 }
 531
 532 static void vsllink_tap_ensure_pending(int scans)
 533 {
 534         int available_scans =
 535                 MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
 536
 537         if (scans > available_scans)
 538                 vsllink_tap_execute();
 539 }
 540
 541 static void vsllink_tap_append_step(int tms, int tdi)
 542 {
 543         int index_var = tap_length / 8;
 544
 545         int bit_index = tap_length % 8;
 546         uint8_t bit = 1 << bit_index;
 547
 548         if (tms)
 549                 tms_buffer[index_var] |= bit;
 550         else
 551                 tms_buffer[index_var] &= ~bit;
 552
 553         if (tdi)
 554                 tdi_buffer[index_var] |= bit;
 555         else
 556                 tdi_buffer[index_var] &= ~bit;
 557
 558         tap_length++;
 559
 560         if (tap_buffer_size * 8 <= tap_length)
 561                 vsllink_tap_execute();
 562 }
 563
 564 static void vsllink_tap_append_scan(int length, uint8_t *buffer,
 565         struct scan_command *command)
 566 {
 567         struct pending_scan_result *pending_scan_result;
 568         int len_tmp, len_all, i;
 569
 570         len_all = 0;
 571         while (len_all < length) {
 572                 vsllink_tap_ensure_pending(1);
 573                 pending_scan_result =
 574                         &pending_scan_results_buffer[
 575                                 pending_scan_results_length];
 576
 577                 if ((length - len_all) > (tap_buffer_size * 8 - tap_length)) {
 578                         /* Use all memory available
 579                            vsllink_tap_append_step will commit automatically */
 580                         len_tmp = tap_buffer_size * 8 - tap_length;
 581                         pending_scan_result->last = false;
 582                 } else {
 583                         len_tmp = length - len_all;
 584                         pending_scan_result->last = true;
 585                 }
 586                 pending_scan_result->src_offset = tap_length;
 587                 pending_scan_result->dest_offset = len_all;
 588                 pending_scan_result->length = len_tmp;
 589                 pending_scan_result->command = command;
 590                 pending_scan_result->buffer = buffer;
 591                 pending_scan_results_length++;
 592
 593                 for (i = 0; i < len_tmp; i++) {
 594                         vsllink_tap_append_step(((len_all + i) < length-1
 595                                                  ? 0 : 1),
 596                                 (buffer[(len_all + i)/8]
 597                                  >> ((len_all + i)%8)) & 1);
 598                 }
 599
 600                 len_all += len_tmp;
 601         }
 602 }
 603
 604 static int vsllink_jtag_execute(void)
 605 {
 606         int i;
 607         int result;
 608
 609         if (tap_length <= 0)
 610                 return ERROR_OK;
 611
 612         versaloon_interface.adaptors.jtag_raw.execute(0, tdi_buffer, tms_buffer,
 613                 tdo_buffer, tap_length);
 614
 615         result = versaloon_interface.adaptors.peripheral_commit();
 616
 617         if (result == ERROR_OK) {
 618                 for (i = 0; i < pending_scan_results_length; i++) {
 619                         struct pending_scan_result *pending_scan_result =
 620                                 &pending_scan_results_buffer[i];
 621                         uint8_t *buffer = pending_scan_result->buffer;
 622                         int length = pending_scan_result->length;
 623                         int src_first = pending_scan_result->src_offset;
 624                         int dest_first = pending_scan_result->dest_offset;
 625                         bool last = pending_scan_result->last;
 626
 627                         struct scan_command *command;
 628
 629                         command = pending_scan_result->command;
 630                         buf_set_buf(tdo_buffer, src_first, buffer, dest_first, length);
 631
 632 #ifdef _DEBUG_JTAG_IO_
 633                         DEBUG_JTAG_IO(
 634                                 "JTAG scan read(%d bits, from src %d bits to dest %d bits):",
 635                                 length, src_first, dest_first);
 636                         vsllink_debug_buffer(buffer + dest_first / 8,
 637                                 DIV_ROUND_UP(length, 7));
 638 #endif
 639
 640                         if (last) {
 641                                 if (jtag_read_buffer(buffer, command)
 642                                     != ERROR_OK) {
 643                                         vsllink_tap_init();
 644                                         return ERROR_JTAG_QUEUE_FAILED;
 645                                 }
 646
 647                                 if (pending_scan_result->buffer != NULL)
 648                                         free(pending_scan_result->buffer);
 649                         }
 650                 }
 651         } else {
 652                 LOG_ERROR("vsllink_jtag_execute failure");
 653                 return ERROR_JTAG_QUEUE_FAILED;
 654         }
 655
 656         vsllink_tap_init();
 657
 658         return ERROR_OK;
 659 }
 660
 661 static int vsllink_tap_execute(void)
 662 {
 663         return vsllink_jtag_execute();
 664 }
 665
 666 /****************************************************************************
 667  * VSLLink USB low-level functions */
 668
 669 static uint8_t usb_check_string(usb_dev_handle *usb, uint8_t stringidx,
 670         char *string, char *buff, uint16_t buf_size)
 671 {
 672         int len;
 673         uint8_t alloced = 0;
 674         uint8_t ret = 1;
 675
 676         if (NULL == buff) {
 677                 buf_size = 256;
 678                 buff = malloc(buf_size);
 679                 if (NULL == buff) {
 680                         ret = 0;
 681                         goto free_and_return;
 682                 }
 683                 alloced = 1;
 684         }
 685
 686         strcpy(buff, "");
 687         len = usb_get_string_simple(usb, stringidx, buff, buf_size);
 688         if ((len < 0) || ((size_t)len != strlen(buff))) {
 689                 ret = 0;
 690                 goto free_and_return;
 691         }
 692
 693         buff[len] = '\0';
 694         if ((string != NULL) && strcmp(buff, string)) {
 695                 ret = 0;
 696                 goto free_and_return;
 697         }
 698
 699 free_and_return:
 700         if (alloced && (buff != NULL)) {
 701                 free(buff);
 702                 buff = NULL;
 703         }
 704         return ret;
 705 }
 706
 707 static usb_dev_handle *find_usb_device(uint16_t VID, uint16_t PID, uint8_t interface,
 708                 char *serialstring, char *productstring)
 709 {
 710         usb_dev_handle *dev_handle = NULL;
 711         struct usb_bus *busses;
 712         struct usb_bus *bus;
 713         struct usb_device *dev;
 714
 715         usb_init();
 716         usb_find_busses();
 717         usb_find_devices();
 718         busses = usb_get_busses();
 719
 720         for (bus = busses; bus; bus = bus->next) {
 721                 for (dev = bus->devices; dev; dev = dev->next) {
 722                         if ((dev->descriptor.idVendor == VID)
 723                             && (dev->descriptor.idProduct == PID)) {
 724                                 dev_handle = usb_open(dev);
 725                                 if (NULL == dev_handle) {
 726                                         LOG_ERROR("failed to open %04X:%04X, %s", VID, PID,
 727                                                 usb_strerror());
 728                                         continue;
 729                                 }
 730
 731                                 /* check description string */
 732                                 if ((productstring != NULL && !usb_check_string(dev_handle,
 733                                                 dev->descriptor.iProduct, productstring, NULL, 0))
 734                                         || (serialstring != NULL && !usb_check_string(dev_handle,
 735                                                                 dev->descriptor.iSerialNumber, serialstring, NULL, 0))) {
 736                                         usb_close(dev_handle);
 737                                         dev_handle = NULL;
 738                                         continue;
 739                                 }
 740
 741                                 if (usb_claim_interface(dev_handle, interface) != 0) {
 742                                         LOG_ERROR(ERRMSG_FAILURE_OPERATION_MESSAGE,
 743                                                 "claim interface", usb_strerror());
 744                                         usb_close(dev_handle);
 745                                         dev_handle = NULL;
 746                                         continue;
 747                                 }
 748
 749                                 if (dev_handle != NULL)
 750                                         return dev_handle;
 751                         }
 752                 }
 753         }
 754
 755         return dev_handle;
 756 }
 757
 758 static struct vsllink *vsllink_usb_open(void)
 759 {
 760         usb_init();
 761
 762         struct usb_dev_handle *dev;
 763
 764         dev = find_usb_device(versaloon_interface.usb_setting.vid,
 765                         versaloon_interface.usb_setting.pid,
 766                         versaloon_interface.usb_setting.interface,
 767                         versaloon_interface.usb_setting.serialstring, "Versaloon");
 768         if (NULL == dev)
 769                 return NULL;
 770
 771         struct vsllink *result = malloc(sizeof(struct vsllink));
 772         result->usb_handle = dev;
 773         return result;
 774 }
 775
 776 static void vsllink_usb_close(struct vsllink *vsllink)
 777 {
 778         int ret;
 779
 780         ret = usb_release_interface(vsllink->usb_handle,
 781                         versaloon_interface.usb_setting.interface);
 782         if (ret != 0) {
 783                 LOG_ERROR("fail to release interface %d, %d returned",
 784                         versaloon_interface.usb_setting.interface, ret);
 785                 exit(-1);
 786         }
 787
 788         ret = usb_close(vsllink->usb_handle);
 789         if (ret != 0) {
 790                 LOG_ERROR("fail to close usb, %d returned", ret);
 791                 exit(-1);
 792         }
 793
 794         free(vsllink);
 795 }
 796
 797 #define BYTES_PER_LINE  16
 798
 799 #if defined _DEBUG_JTAG_IO_
 800 static void vsllink_debug_buffer(uint8_t *buffer, int length)
 801 {
 802         char line[81];
 803         char s[4];
 804         int i;
 805         int j;
 806
 807         for (i = 0; i < length; i += BYTES_PER_LINE) {
 808                 snprintf(line, 5, "%04x", i);
 809                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++) {
 810                         snprintf(s, 4, " %02x", buffer[j]);
 811                         strcat(line, s);
 812                 }
 813                 LOG_DEBUG("%s", line);
 814         }
 815 }
 816 #endif  /* _DEBUG_JTAG_IO_ */
 817
 818 static const struct command_registration vsllink_command_handlers[] = {
 819         {
 820                 .name = "vsllink_usb_vid",
 821                 .handler = &vsllink_handle_usb_vid_command,
 822                 .mode = COMMAND_CONFIG,
 823         },
 824         {
 825                 .name = "vsllink_usb_pid",
 826                 .handler = &vsllink_handle_usb_pid_command,
 827                 .mode = COMMAND_CONFIG,
 828         },
 829         {
 830                 .name = "vsllink_usb_serial",
 831                 .handler = &vsllink_handle_usb_serial_command,
 832                 .mode = COMMAND_CONFIG,
 833         },
 834         {
 835                 .name = "vsllink_usb_bulkin",
 836                 .handler = &vsllink_handle_usb_bulkin_command,
 837                 .mode = COMMAND_CONFIG,
 838         },
 839         {
 840                 .name = "vsllink_usb_bulkout",
 841                 .handler = &vsllink_handle_usb_bulkout_command,
 842                 .mode = COMMAND_CONFIG,
 843         },
 844         {
 845                 .name = "vsllink_usb_interface",
 846                 .handler = &vsllink_handle_usb_interface_command,
 847                 .mode = COMMAND_CONFIG,
 848         },
 849         COMMAND_REGISTRATION_DONE
 850 };
 851
 852 static const char *vsllink_transports[] = {"jtag", "swd", NULL};
 853
 854 struct jtag_interface vsllink_interface = {
 855         .name = "vsllink",
 856         .supported = DEBUG_CAP_TMS_SEQ,
 857         .commands = vsllink_command_handlers,
 858         .transports = vsllink_transports,
 859
 860         .init = vsllink_init,
 861         .quit = vsllink_quit,
 862         .khz = vsllink_khz,
 863         .speed = vsllink_speed,
 864         .speed_div = vsllink_speed_div,
 865         .execute_queue = vsllink_execute_queue,
 866 };