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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  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, 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
 110                                                         ->end_state));
 111
 112                                 vsllink_end_state(cmd->cmd.runtest->end_state);
 113                                 vsllink_runtest(cmd->cmd.runtest->num_cycles);
 114                                 break;
 115
 116                         case JTAG_TLR_RESET:
 117                                 DEBUG_JTAG_IO("statemove end in %s",
 118                                         tap_state_name(cmd->cmd.statemove
 119                                                         ->end_state));
 120
 121                                 vsllink_end_state(cmd->cmd.statemove
 122                                                         ->end_state);
 123                                 vsllink_state_move();
 124                                 break;
 125
 126                         case JTAG_PATHMOVE:
 127                                 DEBUG_JTAG_IO("pathmove: %i states, end in %s",
 128                                         cmd->cmd.pathmove->num_states,
 129                                         tap_state_name(cmd->cmd.pathmove
 130                                                 ->path[cmd->cmd.pathmove
 131                                                         ->num_states - 1]));
 132
 133                                 vsllink_path_move(
 134                                         cmd->cmd.pathmove->num_states,
 135                                         cmd->cmd.pathmove->path);
 136                                 break;
 137
 138                         case JTAG_SCAN:
 139                                 DEBUG_JTAG_IO("JTAG Scan...");
 140
 141                                 vsllink_end_state(cmd->cmd.scan->end_state);
 142
 143                                 scan_size = jtag_build_buffer(
 144                                         cmd->cmd.scan, &buffer);
 145
 146                                 if (cmd->cmd.scan->ir_scan)
 147                                         DEBUG_JTAG_IO(
 148                                                 "JTAG Scan write IR(%d bits), "
 149                                                 "end in %s:",
 150                                                 scan_size,
 151                                                 tap_state_name(cmd->cmd.scan
 152                                                                 ->end_state));
 153
 154                                 else
 155                                         DEBUG_JTAG_IO(
 156                                                 "JTAG Scan write DR(%d bits), "
 157                                                 "end in %s:",
 158                                                 scan_size,
 159                                                 tap_state_name(cmd->cmd.scan
 160                                                         ->end_state));
 161
 162 #ifdef _DEBUG_JTAG_IO_
 163                                 vsllink_debug_buffer(buffer,
 164                                         DIV_ROUND_UP(scan_size, 8));
 165 #endif
 166
 167                                 type = jtag_scan_type(cmd->cmd.scan);
 168
 169                                 vsllink_scan(cmd->cmd.scan->ir_scan,
 170                                                 type, buffer, scan_size,
 171                                                 cmd->cmd.scan);
 172                                 break;
 173
 174                         case JTAG_RESET:
 175                                 DEBUG_JTAG_IO("reset trst: %i srst %i",
 176                                                 cmd->cmd.reset->trst,
 177                                                 cmd->cmd.reset->srst);
 178
 179                                 vsllink_tap_execute();
 180
 181                                 if (cmd->cmd.reset->trst == 1)
 182                                         tap_set_state(TAP_RESET);
 183
 184                                 vsllink_reset(cmd->cmd.reset->trst,
 185                                                 cmd->cmd.reset->srst);
 186                                 break;
 187
 188                         case JTAG_SLEEP:
 189                                 DEBUG_JTAG_IO("sleep %i", cmd->cmd.sleep->us);
 190                                 vsllink_tap_execute();
 191                                 jtag_sleep(cmd->cmd.sleep->us);
 192                                 break;
 193
 194                         case JTAG_STABLECLOCKS:
 195                                 DEBUG_JTAG_IO("add %d clocks",
 196                                         cmd->cmd.stableclocks->num_cycles);
 197
 198                                 switch (tap_get_state()) {
 199                                 case TAP_RESET:
 200                                         /* tms must be '1' to stay
 201                                          * n TAP_RESET mode
 202                                          */
 203                                         scan_size = 1;
 204                                         break;
 205                                 case TAP_DRSHIFT:
 206                                 case TAP_IDLE:
 207                                 case TAP_DRPAUSE:
 208                                 case TAP_IRSHIFT:
 209                                 case TAP_IRPAUSE:
 210                                         /* else, tms should be '0' */
 211                                         scan_size = 0;
 212                                         break;
 213                                         /* above stable states are OK */
 214                                 default:
 215                                          LOG_ERROR("jtag_add_clocks() "
 216                                                 "in non-stable state \"%s\"",
 217                                                 tap_state_name(tap_get_state())
 218                                                 );
 219                                  exit(-1);
 220                                 }
 221                                 vsllink_stableclocks(cmd->cmd.stableclocks
 222                                                 ->num_cycles, scan_size);
 223                                 break;
 224
 225                         case JTAG_TMS:
 226                                 DEBUG_JTAG_IO("add %d jtag tms",
 227                                                 cmd->cmd.tms->num_bits);
 228
 229                                 vsllink_tms(cmd->cmd.tms->num_bits, cmd->cmd.tms->bits);
 230                                 break;
 231
 232                         default:
 233                                 LOG_ERROR("BUG: unknown JTAG command type "
 234                                         "encountered: %d", cmd->type);
 235                                 exit(-1);
 236                 }
 237                 cmd = cmd->next;
 238         }
 239
 240         return vsllink_tap_execute();
 241 }
 242
 243 static int vsllink_speed(int speed)
 244 {
 245         versaloon_interface.adaptors.jtag_raw.config(0, (uint16_t)speed);
 246         return versaloon_interface.adaptors.peripheral_commit();
 247 }
 248
 249 static int vsllink_khz(int khz, int *jtag_speed)
 250 {
 251         *jtag_speed = khz;
 252
 253         return ERROR_OK;
 254 }
 255
 256 static int vsllink_speed_div(int jtag_speed, int *khz)
 257 {
 258         *khz = jtag_speed;
 259
 260         return ERROR_OK;
 261 }
 262
 263 static void vsllink_free_buffer(void)
 264 {
 265         if (tdi_buffer != NULL)
 266         {
 267                 free(tdi_buffer);
 268                 tdi_buffer = NULL;
 269         }
 270         if (tdo_buffer != NULL)
 271         {
 272                 free(tdo_buffer);
 273                 tdo_buffer = NULL;
 274         }
 275         if (tms_buffer != NULL)
 276         {
 277                 free(tms_buffer);
 278                 tms_buffer = NULL;
 279         }
 280 }
 281
 282 static int vsllink_quit(void)
 283 {
 284         versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
 285                 0, 0, GPIO_SRST | GPIO_TRST);
 286         versaloon_interface.adaptors.gpio.fini(0);
 287         versaloon_interface.adaptors.jtag_raw.fini(0);
 288         versaloon_interface.adaptors.peripheral_commit();
 289         versaloon_interface.fini();
 290
 291         vsllink_free_buffer();
 292         vsllink_usb_close(vsllink_handle);
 293
 294         return ERROR_OK;
 295 }
 296
 297 static int vsllink_init(void)
 298 {
 299         vsllink_handle = vsllink_usb_open();
 300         if (vsllink_handle == 0) {
 301                 LOG_ERROR("Can't find USB JTAG Interface!"\
 302                                 "Please check connection and permissions.");
 303                 return ERROR_JTAG_INIT_FAILED;
 304         }
 305         LOG_DEBUG("vsllink found on %04X:%04X",
 306                         versaloon_interface.usb_setting.vid,
 307                         versaloon_interface.usb_setting.pid);
 308         versaloon_usb_device_handle = vsllink_handle->usb_handle;
 309
 310         if (ERROR_OK != versaloon_interface.init())
 311         {
 312                 return ERROR_FAIL;
 313         }
 314         if (versaloon_interface.usb_setting.buf_size < 32)
 315         {
 316                 versaloon_interface.fini();
 317                 return ERROR_FAIL;
 318         }
 319
 320         // malloc buffer size for tap
 321         tap_buffer_size = versaloon_interface.usb_setting.buf_size - 32;
 322         vsllink_free_buffer();
 323         tdi_buffer = (uint8_t *)malloc(tap_buffer_size);
 324         tdo_buffer = (uint8_t *)malloc(tap_buffer_size);
 325         tms_buffer = (uint8_t *)malloc(tap_buffer_size);
 326         if ((NULL == tdi_buffer) || (NULL == tdo_buffer) || (NULL == tms_buffer))
 327         {
 328                 vsllink_quit();
 329                 return ERROR_FAIL;
 330         }
 331
 332         versaloon_interface.adaptors.jtag_raw.init(0);
 333         versaloon_interface.adaptors.jtag_raw.config(0, jtag_get_speed_khz());
 334         versaloon_interface.adaptors.gpio.init(0);
 335         versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
 336                                 GPIO_TRST, GPIO_SRST, GPIO_SRST);
 337         if (ERROR_OK != versaloon_interface.adaptors.peripheral_commit())
 338         {
 339                 return ERROR_FAIL;
 340         }
 341
 342         vsllink_reset(0, 0);
 343         vsllink_tap_init();
 344         return ERROR_OK;
 345 }
 346
 347 /***************************************************************************/
 348 /* Queue command implementations */
 349
 350 static void vsllink_end_state(tap_state_t state)
 351 {
 352         if (tap_is_state_stable(state))
 353                 tap_set_end_state(state);
 354         else {
 355                 LOG_ERROR("BUG: %i is not a valid end state", state);
 356                 exit(-1);
 357         }
 358 }
 359
 360 /* Goes to the end state. */
 361 static void vsllink_state_move(void)
 362 {
 363         int i;
 364         uint8_t tms_scan = tap_get_tms_path(tap_get_state(),
 365                                         tap_get_end_state());
 366         uint8_t tms_scan_bits = tap_get_tms_path_len(tap_get_state(),
 367                                         tap_get_end_state());
 368
 369         for (i = 0; i < tms_scan_bits; i++)
 370                 vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 371
 372         tap_set_state(tap_get_end_state());
 373 }
 374
 375 static void vsllink_path_move(int num_states, tap_state_t *path)
 376 {
 377         for (int i = 0; i < num_states; i++) {
 378                 if (path[i] == tap_state_transition(tap_get_state(), false))
 379                         vsllink_tap_append_step(0, 0);
 380                 else if (path[i] == tap_state_transition(tap_get_state(), true))
 381                         vsllink_tap_append_step(1, 0);
 382                 else {
 383                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 384                                                 tap_state_name(tap_get_state()),
 385                                                 tap_state_name(path[i]));
 386                         exit(-1);
 387                 }
 388
 389                 tap_set_state(path[i]);
 390         }
 391
 392         tap_set_end_state(tap_get_state());
 393 }
 394
 395 static void vsllink_tms(int num_bits, const uint8_t *bits)
 396 {
 397         for (int i = 0; i < num_bits; i++) {
 398                 vsllink_tap_append_step((bits[i / 8] >> (i % 8)) & 1, 0);
 399         }
 400 }
 401
 402 static void vsllink_stableclocks(int num_cycles, int tms)
 403 {
 404         while (num_cycles > 0) {
 405                 vsllink_tap_append_step(tms, 0);
 406                 num_cycles--;
 407         }
 408 }
 409
 410 static void vsllink_runtest(int num_cycles)
 411 {
 412         tap_state_t saved_end_state = tap_get_end_state();
 413
 414         if (tap_get_state() != TAP_IDLE) {
 415                 /* enter IDLE state */
 416                 vsllink_end_state(TAP_IDLE);
 417                 vsllink_state_move();
 418         }
 419
 420         vsllink_stableclocks(num_cycles, 0);
 421
 422         // post-process
 423         // set end_state
 424         vsllink_end_state(saved_end_state);
 425         if (tap_get_end_state() != tap_get_end_state())
 426                 vsllink_state_move();
 427 }
 428
 429 static void vsllink_scan(bool ir_scan, enum scan_type type, uint8_t *buffer,
 430                                 int scan_size, struct scan_command *command)
 431 {
 432         tap_state_t saved_end_state;
 433
 434         saved_end_state = tap_get_end_state();
 435
 436         /* Move to appropriate scan state */
 437         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
 438
 439         if (tap_get_state() != tap_get_end_state())
 440                 vsllink_state_move();
 441         vsllink_end_state(saved_end_state);
 442
 443         /* Scan */
 444         vsllink_tap_append_scan(scan_size, buffer, command);
 445
 446         /* Goto Pause and record position to insert tms:0 */
 447         vsllink_tap_append_step(0, 0);
 448         vsllink_tms_offset = tap_length;
 449
 450         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
 451
 452         if (tap_get_state() != tap_get_end_state())
 453                 vsllink_state_move();
 454 }
 455
 456 static void vsllink_reset(int trst, int srst)
 457 {
 458         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
 459
 460         if (!srst)
 461                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, 0, GPIO_SRST, GPIO_SRST);
 462         else
 463                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, GPIO_SRST, 0, 0);
 464
 465         if (!trst)
 466                 versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, GPIO_TRST);
 467         else
 468                 versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, 0);
 469         versaloon_interface.adaptors.peripheral_commit();
 470 }
 471
 472 COMMAND_HANDLER(vsllink_handle_usb_vid_command)
 473 {
 474         if (CMD_ARGC != 1) {
 475                 LOG_ERROR("parameter error, "
 476                                         "should be one parameter for VID");
 477                 return ERROR_OK;
 478         }
 479
 480         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0],
 481                 versaloon_interface.usb_setting.vid);
 482         return ERROR_OK;
 483 }
 484
 485 COMMAND_HANDLER(vsllink_handle_usb_pid_command)
 486 {
 487         if (CMD_ARGC != 1) {
 488                 LOG_ERROR("parameter error, "
 489                                         "should be one parameter for PID");
 490                 return ERROR_OK;
 491         }
 492         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0],
 493                 versaloon_interface.usb_setting.pid);
 494         return ERROR_OK;
 495 }
 496
 497 COMMAND_HANDLER(vsllink_handle_usb_bulkin_command)
 498 {
 499         if (CMD_ARGC != 1) {
 500                 LOG_ERROR("parameter error, "
 501                         "should be one parameter for BULKIN endpoint");
 502                 return ERROR_OK;
 503         }
 504
 505         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 506                 versaloon_interface.usb_setting.ep_in);
 507
 508         versaloon_interface.usb_setting.ep_in |= 0x80;
 509
 510         return ERROR_OK;
 511 }
 512
 513 COMMAND_HANDLER(vsllink_handle_usb_bulkout_command)
 514 {
 515         if (CMD_ARGC != 1) {
 516                 LOG_ERROR("parameter error, "
 517                         "should be one parameter for BULKOUT endpoint");
 518                 return ERROR_OK;
 519         }
 520
 521         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 522                 versaloon_interface.usb_setting.ep_out);
 523
 524         versaloon_interface.usb_setting.ep_out &= ~0x80;
 525
 526         return ERROR_OK;
 527 }
 528
 529 COMMAND_HANDLER(vsllink_handle_usb_interface_command)
 530 {
 531         if (CMD_ARGC != 1) {
 532                 LOG_ERROR("parameter error, "
 533                         "should be one parameter for interface number");
 534                 return ERROR_OK;
 535         }
 536
 537         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 538                 versaloon_interface.usb_setting.interface);
 539         return ERROR_OK;
 540 }
 541
 542 /***************************************************************************/
 543 /* VSLLink tap functions */
 544
 545 static void vsllink_tap_init(void)
 546 {
 547         tap_length = 0;
 548         pending_scan_results_length = 0;
 549         vsllink_tms_offset = 0;
 550 }
 551
 552 static void vsllink_tap_ensure_pending(int scans)
 553 {
 554         int available_scans =
 555                         MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
 556
 557         if (scans > available_scans)
 558                 vsllink_tap_execute();
 559 }
 560
 561 static void vsllink_tap_append_step(int tms, int tdi)
 562 {
 563         int index_var = tap_length / 8;
 564
 565         int bit_index = tap_length % 8;
 566         uint8_t bit = 1 << bit_index;
 567
 568         if (tms)
 569                 tms_buffer[index_var] |= bit;
 570         else
 571                 tms_buffer[index_var] &= ~bit;
 572
 573         if (tdi)
 574                 tdi_buffer[index_var] |= bit;
 575         else
 576                 tdi_buffer[index_var] &= ~bit;
 577
 578         tap_length++;
 579
 580         if (tap_buffer_size * 8 <= tap_length)
 581                 vsllink_tap_execute();
 582 }
 583
 584 static void vsllink_tap_append_scan(int length, uint8_t *buffer,
 585                 struct scan_command *command)
 586 {
 587         struct pending_scan_result *pending_scan_result;
 588         int len_tmp, len_all, i;
 589
 590         len_all = 0;
 591         while (len_all < length) {
 592                 vsllink_tap_ensure_pending(1);
 593                 pending_scan_result =
 594                                 &pending_scan_results_buffer[
 595                                         pending_scan_results_length];
 596
 597                 if ((length - len_all) > (tap_buffer_size * 8 - tap_length)) {
 598                         /* Use all memory available
 599                            vsllink_tap_append_step will commit automatically */
 600                         len_tmp = tap_buffer_size * 8 - tap_length;
 601                         pending_scan_result->last = false;
 602                 } else {
 603                         len_tmp = length - len_all;
 604                         pending_scan_result->last = true;
 605                 }
 606                 pending_scan_result->src_offset = tap_length;
 607                 pending_scan_result->dest_offset = len_all;
 608                 pending_scan_result->length = len_tmp;
 609                 pending_scan_result->command = command;
 610                 pending_scan_result->buffer = buffer;
 611                 pending_scan_results_length++;
 612
 613                 for (i = 0; i < len_tmp; i++) {
 614                         vsllink_tap_append_step(((len_all + i) < length-1
 615                                                 ? 0 : 1),
 616                                         (buffer[(len_all + i)/8]
 617                                                 >> ((len_all + i)%8)) & 1);
 618                 }
 619
 620                 len_all += len_tmp;
 621         }
 622 }
 623
 624 static int vsllink_jtag_execute(void)
 625 {
 626         int i;
 627         int result;
 628
 629         if (tap_length <= 0)
 630                 return ERROR_OK;
 631
 632         versaloon_interface.adaptors.jtag_raw.execute(0, tdi_buffer, tms_buffer,
 633                 tdo_buffer, tap_length);
 634
 635         result = versaloon_interface.adaptors.peripheral_commit();
 636
 637         if (result == ERROR_OK) {
 638                 for (i = 0; i < pending_scan_results_length; i++) {
 639                         struct pending_scan_result *pending_scan_result =
 640                                 &pending_scan_results_buffer[i];
 641                         uint8_t *buffer = pending_scan_result->buffer;
 642                         int length = pending_scan_result->length;
 643                         int src_first = pending_scan_result->src_offset;
 644                         int dest_first = pending_scan_result->dest_offset;
 645                         bool last = pending_scan_result->last;
 646
 647                         struct scan_command *command;
 648
 649                         command = pending_scan_result->command;
 650                         buf_set_buf(tdo_buffer, src_first, buffer, dest_first, length);
 651
 652 #ifdef _DEBUG_JTAG_IO_
 653                         DEBUG_JTAG_IO(
 654                                 "JTAG scan read(%d bits, from src %d bits to dest %d bits):",
 655                                 length, src_first, dest_first);
 656                         vsllink_debug_buffer(buffer + dest_first / 8,
 657                                         DIV_ROUND_UP(length, 7));
 658 #endif
 659
 660                         if (last) {
 661                                 if (jtag_read_buffer(buffer, command)
 662                                                 != ERROR_OK) {
 663                                         vsllink_tap_init();
 664                                         return ERROR_JTAG_QUEUE_FAILED;
 665                                 }
 666
 667                                 if (pending_scan_result->buffer != NULL)
 668                                         free(pending_scan_result->buffer);
 669                         }
 670                 }
 671         } else {
 672                 LOG_ERROR("vsllink_jtag_execute failure");
 673                 return ERROR_JTAG_QUEUE_FAILED;
 674         }
 675
 676         vsllink_tap_init();
 677
 678         return ERROR_OK;
 679 }
 680
 681 static int vsllink_tap_execute(void)
 682 {
 683         return vsllink_jtag_execute();
 684 }
 685
 686 /*****************************************************************************/
 687 /* VSLLink USB low-level functions */
 688
 689 static uint8_t usb_check_string(usb_dev_handle *usb, uint8_t stringidx,
 690                                                                 char * string, char * buff, uint16_t buf_size)
 691 {
 692         int len;
 693         uint8_t alloced = 0;
 694         uint8_t ret = 1;
 695
 696         if (NULL == buff)
 697         {
 698                 buf_size = 256;
 699                 buff = (char*)malloc(buf_size);
 700                 if (NULL == buff)
 701                 {
 702                         ret = 0;
 703                         goto free_and_return;
 704                 }
 705                 alloced = 1;
 706         }
 707
 708         strcpy(buff, "");
 709         len = usb_get_string_simple(usb, stringidx, (char *)buff, buf_size);
 710         if ((len < 0) || (len != ((int)strlen((const char *)buff))))
 711         {
 712                 ret = 0;
 713                 goto free_and_return;
 714         }
 715
 716         buff[len] = '\0';
 717         if ((string != NULL) && strcmp((const char *)buff, string))
 718         {
 719                 ret = 0;
 720                 goto free_and_return;
 721         }
 722
 723 free_and_return:
 724         if (alloced && (buff != NULL))
 725         {
 726                 free(buff);
 727                 buff = NULL;
 728         }
 729         return ret;
 730 }
 731
 732 static usb_dev_handle* find_usb_device(uint16_t VID, uint16_t PID,
 733                 uint8_t interface, int8_t serialindex, char *serialstring,
 734                 int8_t productindex, char *productstring)
 735 {
 736         usb_dev_handle *dev_handle = NULL;
 737         struct usb_bus *busses;
 738         struct usb_bus *bus;
 739         struct usb_device *dev;
 740
 741         usb_init();
 742         usb_find_busses();
 743         usb_find_devices();
 744         busses = usb_get_busses();
 745
 746         for (bus = busses; bus; bus = bus->next)
 747         {
 748                 for (dev = bus->devices; dev; dev = dev->next)
 749                 {
 750                         if ((dev->descriptor.idVendor == VID)
 751                                 && (dev->descriptor.idProduct == PID))
 752                         {
 753                                 dev_handle = usb_open(dev);
 754                                 if (NULL == dev_handle)
 755                                 {
 756                                         LOG_ERROR("failed to open %04X:%04X, %s", VID, PID,
 757                                                                 usb_strerror());
 758                                         continue;
 759                                 }
 760
 761                                 // check description string
 762                                 if (((productstring != NULL) && (productindex >= 0)
 763                                                 && !usb_check_string(dev_handle, productindex,
 764                                                                                                 productstring, NULL, 0))
 765                                         || ((serialstring != NULL) && (serialindex >= 0)
 766                                                 && !usb_check_string(dev_handle, serialindex,
 767                                                                                                 serialstring, NULL, 0)))
 768                                 {
 769                                         usb_close(dev_handle);
 770                                         dev_handle = NULL;
 771                                         continue;
 772                                 }
 773
 774                                 if (usb_claim_interface(dev_handle, interface) != 0)
 775                                 {
 776                                         LOG_ERROR(ERRMSG_FAILURE_OPERATION_MESSAGE,
 777                                                                 "claim interface", usb_strerror());
 778                                         usb_close(dev_handle);
 779                                         dev_handle = NULL;
 780                                         continue;
 781                                 }
 782
 783                                 if (dev_handle != NULL)
 784                                 {
 785                                         return dev_handle;
 786                                 }
 787                         }
 788                 }
 789         }
 790
 791         return dev_handle;
 792 }
 793
 794 static struct vsllink *vsllink_usb_open(void)
 795 {
 796         usb_init();
 797
 798         struct usb_dev_handle *dev;
 799
 800         dev = find_usb_device(versaloon_interface.usb_setting.vid,
 801                                                         versaloon_interface.usb_setting.pid,
 802                                                         versaloon_interface.usb_setting.interface,
 803                                                         0, NULL, 2, "Versaloon");
 804         if (NULL == dev)
 805                 return NULL;
 806
 807         struct vsllink *result = malloc(sizeof(struct vsllink));
 808         result->usb_handle = dev;
 809         return result;
 810 }
 811
 812 static void vsllink_usb_close(struct vsllink *vsllink)
 813 {
 814         int ret;
 815
 816         ret = usb_release_interface(vsllink->usb_handle,
 817                         versaloon_interface.usb_setting.interface);
 818         if (ret != 0) {
 819                 LOG_ERROR("fail to release interface %d, %d returned",
 820                                         versaloon_interface.usb_setting.interface, ret);
 821                 exit(-1);
 822         }
 823
 824         ret = usb_close(vsllink->usb_handle);
 825         if (ret != 0) {
 826                 LOG_ERROR("fail to close usb, %d returned", ret);
 827                 exit(-1);
 828         }
 829
 830         free(vsllink);
 831 }
 832
 833 #define BYTES_PER_LINE  16
 834
 835 #if defined _DEBUG_JTAG_IO_
 836 static void vsllink_debug_buffer(uint8_t *buffer, int length)
 837 {
 838         char line[81];
 839         char s[4];
 840         int i;
 841         int j;
 842
 843         for (i = 0; i < length; i += BYTES_PER_LINE) {
 844                 snprintf(line, 5, "%04x", i);
 845                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++) {
 846                         snprintf(s, 4, " %02x", buffer[j]);
 847                         strcat(line, s);
 848                 }
 849                 LOG_DEBUG("%s", line);
 850         }
 851 }
 852 #endif /* _DEBUG_JTAG_IO_ */
 853
 854 static const struct command_registration vsllink_command_handlers[] = {
 855         {
 856                 .name = "vsllink_usb_vid",
 857                 .handler = &vsllink_handle_usb_vid_command,
 858                 .mode = COMMAND_CONFIG,
 859         },
 860         {
 861                 .name = "vsllink_usb_pid",
 862                 .handler = &vsllink_handle_usb_pid_command,
 863                 .mode = COMMAND_CONFIG,
 864         },
 865         {
 866                 .name = "vsllink_usb_bulkin",
 867                 .handler = &vsllink_handle_usb_bulkin_command,
 868                 .mode = COMMAND_CONFIG,
 869         },
 870         {
 871                 .name = "vsllink_usb_bulkout",
 872                 .handler = &vsllink_handle_usb_bulkout_command,
 873                 .mode = COMMAND_CONFIG,
 874         },
 875         {
 876                 .name = "vsllink_usb_interface",
 877                 .handler = &vsllink_handle_usb_interface_command,
 878                 .mode = COMMAND_CONFIG,
 879         },
 880         COMMAND_REGISTRATION_DONE
 881 };
 882
 883 static const char *vsllink_transports[] = {"jtag", "swd", NULL};
 884
 885 struct jtag_interface vsllink_interface = {
 886         .name = "vsllink",
 887         .supported = DEBUG_CAP_TMS_SEQ,
 888         .commands = vsllink_command_handlers,
 889         .transports = vsllink_transports,
 890
 891         .init = vsllink_init,
 892         .quit = vsllink_quit,
 893         .khz = vsllink_khz,
 894         .speed = vsllink_speed,
 895         .speed_div = vsllink_speed_div,
 896         .execute_queue = vsllink_execute_queue,
 897 };