src/jtag/drivers/opendous.c

   1 /***************************************************************************
   2  *                                                                         *
   3  *   Copyright (C) 2009 by Cahya Wirawan <cahya@gmx.at>                    *
   4  *   Based on opendous driver by Vladimir Fonov                            *
   5  *                                                                         *
   6  *   Copyright (C) 2009 by Vladimir Fonov <vladimir.fonov@gmai.com>        *
   7  *   Based on J-link driver by  Juergen Stuber                             *
   8  *                                                                         *
   9  *   Copyright (C) 2007 by Juergen Stuber <juergen@jstuber.net>            *
  10  *   based on Dominic Rath's and Benedikt Sauter's usbprog.c               *
  11  *                                                                         *
  12  *   Copyright (C) 2008 by Spencer Oliver                                  *
  13  *   spen@spen-soft.co.uk                                                  *
  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, see <http://www.gnu.org/licenses/>. *
  27  ***************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <jtag/interface.h>
  34 #include <jtag/commands.h>
  35 #include "libusb_common.h"
  36 #include <string.h>
  37 #include <time.h>
  38
  39 #define OPENDOUS_MAX_VIDS_PIDS 4
  40 /* define some probes with similar interface */
  41 struct opendous_probe {
  42         const char *name;
  43         uint16_t VID[OPENDOUS_MAX_VIDS_PIDS];
  44         uint16_t PID[OPENDOUS_MAX_VIDS_PIDS];
  45         uint8_t READ_EP;
  46         uint8_t WRITE_EP;
  47         uint8_t CONTROL_TRANSFER;
  48         int BUFFERSIZE;
  49 };
  50
  51 static const struct opendous_probe opendous_probes[] = {
  52         {"usbprog-jtag",        {0x1781, 0},                    {0x0C63, 0},                    0x82, 0x02, 0x00, 510 },
  53         {"opendous",            {0x1781, 0x03EB, 0},    {0xC0C0, 0x204F, 0},    0x81, 0x02, 0x00, 360 },
  54         {"usbvlab",                     {0x16C0, 0},                    {0x05DC, 0},                    0x81, 0x02, 0x01, 360 },
  55         {NULL,                          {0x0000},                               {0x0000},                               0x00, 0x00, 0x00,   0 }
  56 };
  57
  58 #define OPENDOUS_WRITE_ENDPOINT   (opendous_probe->WRITE_EP)
  59 #define OPENDOUS_READ_ENDPOINT    (opendous_probe->READ_EP)
  60
  61 static unsigned int opendous_hw_jtag_version = 1;
  62
  63 #define OPENDOUS_USB_TIMEOUT      1000
  64
  65 #define OPENDOUS_USB_BUFFER_SIZE  (opendous_probe->BUFFERSIZE)
  66 #define OPENDOUS_IN_BUFFER_SIZE   (OPENDOUS_USB_BUFFER_SIZE)
  67 #define OPENDOUS_OUT_BUFFER_SIZE  (OPENDOUS_USB_BUFFER_SIZE)
  68
  69 /* Global USB buffers */
  70 static uint8_t *usb_in_buffer;
  71 static uint8_t *usb_out_buffer;
  72
  73 /* Constants for OPENDOUS command */
  74
  75 #define OPENDOUS_MAX_SPEED                      66
  76 #define OPENDOUS_MAX_TAP_TRANSMIT       ((opendous_probe->BUFFERSIZE)-10)
  77 #define OPENDOUS_MAX_INPUT_DATA         (OPENDOUS_MAX_TAP_TRANSMIT*4)
  78
  79 /* TAP */
  80 #define OPENDOUS_TAP_BUFFER_SIZE 65536
  81
  82 struct pending_scan_result {
  83         int first;      /* First bit position in tdo_buffer to read */
  84         int length; /* Number of bits to read */
  85         struct scan_command *command; /* Corresponding scan command */
  86         uint8_t *buffer;
  87 };
  88
  89 static int pending_scan_results_length;
  90 static struct pending_scan_result *pending_scan_results_buffer;
  91
  92 #define MAX_PENDING_SCAN_RESULTS (OPENDOUS_MAX_INPUT_DATA)
  93
  94 /* JTAG usb commands */
  95 #define JTAG_CMD_TAP_OUTPUT             0x0
  96 #define JTAG_CMD_SET_TRST               0x1
  97 #define JTAG_CMD_SET_SRST               0x2
  98 #define JTAG_CMD_READ_INPUT             0x3
  99 #define JTAG_CMD_TAP_OUTPUT_EMU 0x4
 100 #define JTAG_CMD_SET_DELAY              0x5
 101 #define JTAG_CMD_SET_SRST_TRST  0x6
 102 #define JTAG_CMD_READ_CONFIG    0x7
 103
 104 /* usbvlab control transfer */
 105 #define FUNC_START_BOOTLOADER 30
 106 #define FUNC_WRITE_DATA       0x50
 107 #define FUNC_READ_DATA        0x51
 108
 109 static char *opendous_type;
 110 static const struct opendous_probe *opendous_probe;
 111
 112 /* External interface functions */
 113 static int opendous_execute_queue(void);
 114 static int opendous_init(void);
 115 static int opendous_quit(void);
 116
 117 /* Queue command functions */
 118 static void opendous_end_state(tap_state_t state);
 119 static void opendous_state_move(void);
 120 static void opendous_path_move(int num_states, tap_state_t *path);
 121 static void opendous_runtest(int num_cycles);
 122 static void opendous_scan(int ir_scan, enum scan_type type, uint8_t *buffer,
 123                 int scan_size, struct scan_command *command);
 124 static void opendous_reset(int trst, int srst);
 125 static void opendous_simple_command(uint8_t command, uint8_t _data);
 126 static int opendous_get_status(void);
 127
 128 /* opendous tap buffer functions */
 129 static void opendous_tap_init(void);
 130 static int opendous_tap_execute(void);
 131 static void opendous_tap_ensure_space(int scans, int bits);
 132 static void opendous_tap_append_step(int tms, int tdi);
 133 static void opendous_tap_append_scan(int length, uint8_t *buffer, struct scan_command *command);
 134
 135 /* opendous lowlevel functions */
 136 struct opendous_jtag {
 137         struct jtag_libusb_device_handle *usb_handle;
 138 };
 139
 140 static struct opendous_jtag *opendous_usb_open(void);
 141 static void opendous_usb_close(struct opendous_jtag *opendous_jtag);
 142 static int opendous_usb_message(struct opendous_jtag *opendous_jtag, int out_length, int in_length);
 143 static int opendous_usb_write(struct opendous_jtag *opendous_jtag, int out_length);
 144 static int opendous_usb_read(struct opendous_jtag *opendous_jtag);
 145
 146 /* helper functions */
 147 int opendous_get_version_info(void);
 148
 149 #ifdef _DEBUG_USB_COMMS_
 150 static void opendous_debug_buffer(uint8_t *buffer, int length);
 151 #endif
 152
 153 static struct opendous_jtag *opendous_jtag_handle;
 154
 155 /***************************************************************************/
 156 /* External interface implementation */
 157
 158 COMMAND_HANDLER(opendous_handle_opendous_type_command)
 159 {
 160         if (CMD_ARGC == 0)
 161                 return ERROR_OK;
 162
 163         /* only if the cable name wasn't overwritten by cmdline */
 164         if (opendous_type == NULL) {
 165                 /* REVISIT first verify that it's listed in cables[] ... */
 166                 opendous_type = strdup(CMD_ARGV[0]);
 167         }
 168
 169         /* REVISIT it's probably worth returning the current value ... */
 170
 171         return ERROR_OK;
 172 }
 173
 174 COMMAND_HANDLER(opendous_handle_opendous_info_command)
 175 {
 176         if (opendous_get_version_info() == ERROR_OK) {
 177                 /* attempt to get status */
 178                 opendous_get_status();
 179         }
 180
 181         return ERROR_OK;
 182 }
 183
 184 COMMAND_HANDLER(opendous_handle_opendous_hw_jtag_command)
 185 {
 186         switch (CMD_ARGC) {
 187                 case 0:
 188                         command_print(CMD_CTX, "opendous hw jtag  %i", opendous_hw_jtag_version);
 189                         break;
 190
 191                 case 1: {
 192                         int request_version = atoi(CMD_ARGV[0]);
 193                         switch (request_version) {
 194                                 case 2:
 195                                 case 3:
 196                                         opendous_hw_jtag_version = request_version;
 197                                         break;
 198
 199                         default:
 200                                 return ERROR_COMMAND_SYNTAX_ERROR;
 201                         }
 202                         break;
 203                 }
 204
 205                 default:
 206                         return ERROR_COMMAND_SYNTAX_ERROR;
 207         }
 208
 209         return ERROR_OK;
 210 }
 211
 212 static const struct command_registration opendous_command_handlers[] = {
 213         {
 214                 .name = "opendous_info",
 215                 .handler = &opendous_handle_opendous_info_command,
 216                 .mode = COMMAND_EXEC,
 217                 .help = "show opendous info",
 218         },
 219         {
 220                 .name = "opendous_hw_jtag",
 221                 .handler = &opendous_handle_opendous_hw_jtag_command,
 222                 .mode = COMMAND_EXEC,
 223                 .help = "access opendous HW JTAG command version",
 224                 .usage = "[2|3]",
 225         },
 226         {
 227                 .name = "opendous_type",
 228                 .handler = &opendous_handle_opendous_type_command,
 229                 .mode = COMMAND_CONFIG,
 230                 .help = "set opendous type",
 231                 .usage = "[usbvlab|usbprog-jtag|opendous]",
 232         },
 233         COMMAND_REGISTRATION_DONE
 234 };
 235
 236 struct jtag_interface opendous_interface = {
 237         .name = "opendous",
 238         .commands = opendous_command_handlers,
 239         .execute_queue = opendous_execute_queue,
 240         .init = opendous_init,
 241         .quit = opendous_quit,
 242 };
 243
 244 static int opendous_execute_queue(void)
 245 {
 246         struct jtag_command *cmd = jtag_command_queue;
 247         int scan_size;
 248         enum scan_type type;
 249         uint8_t *buffer;
 250
 251         while (cmd != NULL) {
 252                 switch (cmd->type) {
 253                         case JTAG_RUNTEST:
 254                                 DEBUG_JTAG_IO("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles, \
 255                                         cmd->cmd.runtest->end_state);
 256
 257                                 if (cmd->cmd.runtest->end_state != -1)
 258                                         opendous_end_state(cmd->cmd.runtest->end_state);
 259                                 opendous_runtest(cmd->cmd.runtest->num_cycles);
 260                                 break;
 261
 262                         case JTAG_TLR_RESET:
 263                                 DEBUG_JTAG_IO("statemove end in %i", cmd->cmd.statemove->end_state);
 264
 265                                 if (cmd->cmd.statemove->end_state != -1)
 266                                         opendous_end_state(cmd->cmd.statemove->end_state);
 267                                 opendous_state_move();
 268                                 break;
 269
 270                         case JTAG_PATHMOVE:
 271                                 DEBUG_JTAG_IO("pathmove: %i states, end in %i", \
 272                                         cmd->cmd.pathmove->num_states, \
 273                                         cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
 274
 275                                 opendous_path_move(cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path);
 276                                 break;
 277
 278                         case JTAG_SCAN:
 279                                 DEBUG_JTAG_IO("scan end in %i", cmd->cmd.scan->end_state);
 280
 281                                 if (cmd->cmd.scan->end_state != -1)
 282                                         opendous_end_state(cmd->cmd.scan->end_state);
 283
 284                                 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
 285                                 DEBUG_JTAG_IO("scan input, length = %d", scan_size);
 286
 287 #ifdef _DEBUG_USB_COMMS_
 288                                 opendous_debug_buffer(buffer, (scan_size + 7) / 8);
 289 #endif
 290                                 type = jtag_scan_type(cmd->cmd.scan);
 291                                 opendous_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size, cmd->cmd.scan);
 292                                 break;
 293
 294                         case JTAG_RESET:
 295                                 DEBUG_JTAG_IO("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 296
 297                                 opendous_tap_execute();
 298
 299                                 if (cmd->cmd.reset->trst == 1)
 300                                         tap_set_state(TAP_RESET);
 301                                 opendous_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 302                                 break;
 303
 304                         case JTAG_SLEEP:
 305                                 DEBUG_JTAG_IO("sleep %" PRIi32, cmd->cmd.sleep->us);
 306                                 opendous_tap_execute();
 307                                 jtag_sleep(cmd->cmd.sleep->us);
 308                                 break;
 309
 310                         default:
 311                                 LOG_ERROR("BUG: unknown JTAG command type encountered");
 312                                 exit(-1);
 313                 }
 314                 cmd = cmd->next;
 315         }
 316         return opendous_tap_execute();
 317 }
 318
 319 static int opendous_init(void)
 320 {
 321         int check_cnt;
 322         const struct opendous_probe *cur_opendous_probe;
 323
 324         cur_opendous_probe = opendous_probes;
 325
 326         if (opendous_type == NULL) {
 327                 opendous_type = strdup("opendous");
 328                 LOG_WARNING("No opendous_type specified, using default 'opendous'");
 329         }
 330
 331         while (cur_opendous_probe->name) {
 332                 if (strcmp(cur_opendous_probe->name, opendous_type) == 0) {
 333                         opendous_probe = cur_opendous_probe;
 334                         break;
 335                 }
 336                 cur_opendous_probe++;
 337         }
 338
 339         if (!opendous_probe) {
 340                 LOG_ERROR("No matching cable found for %s", opendous_type);
 341                 return ERROR_JTAG_INIT_FAILED;
 342         }
 343
 344
 345         usb_in_buffer = malloc(opendous_probe->BUFFERSIZE);
 346         usb_out_buffer = malloc(opendous_probe->BUFFERSIZE);
 347
 348         pending_scan_results_buffer = malloc(
 349                         MAX_PENDING_SCAN_RESULTS * sizeof(*pending_scan_results_buffer));
 350
 351         opendous_jtag_handle = opendous_usb_open();
 352
 353         if (opendous_jtag_handle == 0) {
 354                 LOG_ERROR("Cannot find opendous Interface! Please check connection and permissions.");
 355                 return ERROR_JTAG_INIT_FAILED;
 356         }
 357
 358         check_cnt = 0;
 359         while (check_cnt < 3) {
 360                 if (opendous_get_version_info() == ERROR_OK) {
 361                         /* attempt to get status */
 362                         opendous_get_status();
 363                         break;
 364                 }
 365
 366                 check_cnt++;
 367         }
 368
 369         LOG_INFO("opendous JTAG Interface ready");
 370
 371         opendous_reset(0, 0);
 372         opendous_tap_init();
 373
 374         return ERROR_OK;
 375 }
 376
 377 static int opendous_quit(void)
 378 {
 379         opendous_usb_close(opendous_jtag_handle);
 380
 381         if (usb_out_buffer) {
 382                 free(usb_out_buffer);
 383                 usb_out_buffer = NULL;
 384         }
 385
 386         if (usb_in_buffer) {
 387                 free(usb_in_buffer);
 388                 usb_in_buffer = NULL;
 389         }
 390
 391         if (pending_scan_results_buffer) {
 392                 free(pending_scan_results_buffer);
 393                 pending_scan_results_buffer = NULL;
 394         }
 395
 396         if (opendous_type) {
 397                 free(opendous_type);
 398                 opendous_type = NULL;
 399         }
 400
 401         return ERROR_OK;
 402 }
 403
 404 /***************************************************************************/
 405 /* Queue command implementations */
 406
 407 void opendous_end_state(tap_state_t state)
 408 {
 409         if (tap_is_state_stable(state))
 410                 tap_set_end_state(state);
 411         else {
 412                 LOG_ERROR("BUG: %i is not a valid end state", state);
 413                 exit(-1);
 414         }
 415 }
 416
 417 /* Goes to the end state. */
 418 void opendous_state_move(void)
 419 {
 420         int i;
 421         int tms = 0;
 422         uint8_t tms_scan = tap_get_tms_path(tap_get_state(), tap_get_end_state());
 423         uint8_t tms_scan_bits = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
 424
 425         for (i = 0; i < tms_scan_bits; i++) {
 426                 tms = (tms_scan >> i) & 1;
 427                 opendous_tap_append_step(tms, 0);
 428         }
 429
 430         tap_set_state(tap_get_end_state());
 431 }
 432
 433 void opendous_path_move(int num_states, tap_state_t *path)
 434 {
 435         int i;
 436
 437         for (i = 0; i < num_states; i++) {
 438                 if (path[i] == tap_state_transition(tap_get_state(), false))
 439                         opendous_tap_append_step(0, 0);
 440                 else if (path[i] == tap_state_transition(tap_get_state(), true))
 441                         opendous_tap_append_step(1, 0);
 442                 else {
 443                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 444                                         tap_state_name(tap_get_state()), tap_state_name(path[i]));
 445                         exit(-1);
 446                 }
 447
 448                 tap_set_state(path[i]);
 449         }
 450
 451         tap_set_end_state(tap_get_state());
 452 }
 453
 454 void opendous_runtest(int num_cycles)
 455 {
 456         int i;
 457
 458         tap_state_t saved_end_state = tap_get_end_state();
 459
 460         /* only do a state_move when we're not already in IDLE */
 461         if (tap_get_state() != TAP_IDLE) {
 462                 opendous_end_state(TAP_IDLE);
 463                 opendous_state_move();
 464         }
 465
 466         /* execute num_cycles */
 467         for (i = 0; i < num_cycles; i++)
 468                 opendous_tap_append_step(0, 0);
 469
 470         /* finish in end_state */
 471         opendous_end_state(saved_end_state);
 472         if (tap_get_state() != tap_get_end_state())
 473                 opendous_state_move();
 474 }
 475
 476 void opendous_scan(int ir_scan, enum scan_type type, uint8_t *buffer, int scan_size, struct scan_command *command)
 477 {
 478         tap_state_t saved_end_state;
 479
 480         opendous_tap_ensure_space(1, scan_size + 8);
 481
 482         saved_end_state = tap_get_end_state();
 483
 484         /* Move to appropriate scan state */
 485         opendous_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
 486
 487         if (tap_get_state() != tap_get_end_state())
 488                 opendous_state_move();
 489
 490         opendous_end_state(saved_end_state);
 491
 492         /* Scan */
 493         opendous_tap_append_scan(scan_size, buffer, command);
 494
 495         /* We are in Exit1, go to Pause */
 496         opendous_tap_append_step(0, 0);
 497
 498         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
 499
 500         if (tap_get_state() != tap_get_end_state())
 501                 opendous_state_move();
 502 }
 503
 504 void opendous_reset(int trst, int srst)
 505 {
 506         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
 507
 508         /* Signals are active low */
 509 #if 0
 510         if (srst == 0)
 511                 opendous_simple_command(JTAG_CMD_SET_SRST, 1);
 512         else if (srst == 1)
 513                 opendous_simple_command(JTAG_CMD_SET_SRST, 0);
 514
 515         if (trst == 0)
 516                 opendous_simple_command(JTAG_CMD_SET_TRST, 1);
 517         else if (trst == 1)
 518                 opendous_simple_command(JTAG_CMD_SET_TRST, 0);
 519 #endif
 520
 521         srst = srst ? 0 : 1;
 522         trst = trst ? 0 : 2;
 523         opendous_simple_command(JTAG_CMD_SET_SRST_TRST, srst | trst);
 524 }
 525
 526 void opendous_simple_command(uint8_t command, uint8_t _data)
 527 {
 528         int result;
 529
 530         DEBUG_JTAG_IO("0x%02x 0x%02x", command, _data);
 531
 532         usb_out_buffer[0] = 2;
 533         usb_out_buffer[1] = 0;
 534         usb_out_buffer[2] = command;
 535         usb_out_buffer[3] = _data;
 536
 537         result = opendous_usb_message(opendous_jtag_handle, 4, 1);
 538         if (result != 1)
 539                 LOG_ERROR("opendous command 0x%02x failed (%d)", command, result);
 540 }
 541
 542 int opendous_get_status(void)
 543 {
 544         return ERROR_OK;
 545 }
 546
 547 int opendous_get_version_info(void)
 548 {
 549         return ERROR_OK;
 550 }
 551
 552 /***************************************************************************/
 553 /* Estick tap functions */
 554
 555 static int tap_length;
 556 static uint8_t tms_buffer[OPENDOUS_TAP_BUFFER_SIZE];
 557 static uint8_t tdo_buffer[OPENDOUS_TAP_BUFFER_SIZE];
 558
 559 static int last_tms;
 560
 561 void opendous_tap_init(void)
 562 {
 563         tap_length = 0;
 564         pending_scan_results_length = 0;
 565 }
 566
 567 void opendous_tap_ensure_space(int scans, int bits)
 568 {
 569         int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
 570         int available_bits = OPENDOUS_TAP_BUFFER_SIZE / 2 - tap_length;
 571
 572         if ((scans > available_scans) || (bits > available_bits))
 573                 opendous_tap_execute();
 574 }
 575
 576 void opendous_tap_append_step(int tms, int tdi)
 577 {
 578         last_tms = tms;
 579         unsigned char _tms = tms ? 1 : 0;
 580         unsigned char _tdi = tdi ? 1 : 0;
 581
 582         opendous_tap_ensure_space(0, 1);
 583
 584         int tap_index =  tap_length / 4;
 585         int bits  = (tap_length % 4) * 2;
 586
 587         if (tap_length < OPENDOUS_TAP_BUFFER_SIZE) {
 588                 if (!bits)
 589                         tms_buffer[tap_index] = 0;
 590
 591                 tms_buffer[tap_index] |= (_tdi << bits)|(_tms << (bits + 1)) ;
 592                 tap_length++;
 593         } else
 594                 LOG_ERROR("opendous_tap_append_step, overflow");
 595 }
 596
 597 void opendous_tap_append_scan(int length, uint8_t *buffer, struct scan_command *command)
 598 {
 599         DEBUG_JTAG_IO("append scan, length = %d", length);
 600
 601         struct pending_scan_result *pending_scan_result = &pending_scan_results_buffer[pending_scan_results_length];
 602         int i;
 603
 604         pending_scan_result->first = tap_length;
 605         pending_scan_result->length = length;
 606         pending_scan_result->command = command;
 607         pending_scan_result->buffer = buffer;
 608
 609         for (i = 0; i < length; i++)
 610                 opendous_tap_append_step((i < length-1 ? 0 : 1), (buffer[i / 8] >> (i % 8)) & 1);
 611         pending_scan_results_length++;
 612 }
 613
 614 /* Pad and send a tap sequence to the device, and receive the answer.
 615  * For the purpose of padding we assume that we are in idle or pause state. */
 616 int opendous_tap_execute(void)
 617 {
 618         int byte_length;
 619         int i, j;
 620         int result;
 621
 622 #ifdef _DEBUG_USB_COMMS_
 623         int byte_length_out;
 624 #endif
 625
 626         if (tap_length > 0) {
 627
 628                 /* memset(tdo_buffer,0,OPENDOUS_TAP_BUFFER_SIZE); */
 629                 /* LOG_INFO("OPENDOUS tap execute %d",tap_length); */
 630                 byte_length = (tap_length + 3) / 4;
 631
 632 #ifdef _DEBUG_USB_COMMS_
 633                 byte_length_out = (tap_length + 7) / 8;
 634                 LOG_DEBUG("opendous is sending %d bytes", byte_length);
 635 #endif
 636
 637                 for (j = 0, i = 0; j <  byte_length;) {
 638
 639                         int receive;
 640                         int transmit = byte_length - j;
 641                         if (transmit > OPENDOUS_MAX_TAP_TRANSMIT) {
 642                                 transmit = OPENDOUS_MAX_TAP_TRANSMIT;
 643                                 receive = (OPENDOUS_MAX_TAP_TRANSMIT) / 2;
 644                                 usb_out_buffer[2] = JTAG_CMD_TAP_OUTPUT;
 645                         } else {
 646                                 usb_out_buffer[2] = JTAG_CMD_TAP_OUTPUT | ((tap_length % 4) << 4);
 647                                 receive = (transmit + 1) / 2;
 648                         }
 649                         usb_out_buffer[0] = (transmit + 1) & 0xff;
 650                         usb_out_buffer[1] = ((transmit + 1) >> 8) & 0xff;
 651
 652                         memmove(usb_out_buffer + 3, tms_buffer + j, transmit);
 653                         result = opendous_usb_message(opendous_jtag_handle, 3 + transmit, receive);
 654                         if (result != receive) {
 655                                 LOG_ERROR("opendous_tap_execute, wrong result %d, expected %d", result, receive);
 656                                 return ERROR_JTAG_QUEUE_FAILED;
 657                         }
 658
 659                         memmove(tdo_buffer + i, usb_in_buffer, receive);
 660                         i += receive;
 661                         j += transmit;
 662                 }
 663
 664 #ifdef _DEBUG_USB_COMMS_
 665                 LOG_DEBUG("opendous tap result %d", byte_length_out);
 666                 opendous_debug_buffer(tdo_buffer, byte_length_out);
 667 #endif
 668
 669                 /* LOG_INFO("eStick tap execute %d",tap_length); */
 670                 for (i = 0; i < pending_scan_results_length; i++) {
 671
 672                         struct pending_scan_result *pending_scan_result = &pending_scan_results_buffer[i];
 673                         uint8_t *buffer = pending_scan_result->buffer;
 674                         int length = pending_scan_result->length;
 675                         int first = pending_scan_result->first;
 676                         struct scan_command *command = pending_scan_result->command;
 677
 678                         /* Copy to buffer */
 679                         buf_set_buf(tdo_buffer, first, buffer, 0, length);
 680
 681                         DEBUG_JTAG_IO("pending scan result, length = %d", length);
 682
 683 #ifdef _DEBUG_USB_COMMS_
 684                         opendous_debug_buffer(buffer, byte_length_out);
 685 #endif
 686
 687                         if (jtag_read_buffer(buffer, command) != ERROR_OK) {
 688                                 opendous_tap_init();
 689                                 return ERROR_JTAG_QUEUE_FAILED;
 690                         }
 691
 692                         if (pending_scan_result->buffer != NULL)
 693                                 free(pending_scan_result->buffer);
 694                 }
 695
 696                 opendous_tap_init();
 697         }
 698
 699         return ERROR_OK;
 700 }
 701
 702 /*****************************************************************************/
 703 /* Estick USB low-level functions */
 704
 705 struct opendous_jtag *opendous_usb_open(void)
 706 {
 707         struct opendous_jtag *result;
 708
 709         struct jtag_libusb_device_handle *devh;
 710         if (jtag_libusb_open(opendous_probe->VID, opendous_probe->PID, NULL, &devh) != ERROR_OK)
 711                 return NULL;
 712
 713         jtag_libusb_set_configuration(devh, 0);
 714         jtag_libusb_claim_interface(devh, 0);
 715
 716         result = malloc(sizeof(*result));
 717         result->usb_handle = devh;
 718         return result;
 719 }
 720
 721 void opendous_usb_close(struct opendous_jtag *opendous_jtag)
 722 {
 723         jtag_libusb_close(opendous_jtag->usb_handle);
 724         free(opendous_jtag);
 725 }
 726
 727 /* Send a message and receive the reply. */
 728 int opendous_usb_message(struct opendous_jtag *opendous_jtag, int out_length, int in_length)
 729 {
 730         int result;
 731
 732         result = opendous_usb_write(opendous_jtag, out_length);
 733         if (result == out_length) {
 734                 result = opendous_usb_read(opendous_jtag);
 735                 if (result == in_length)
 736                         return result;
 737                 else {
 738                         LOG_ERROR("usb_bulk_read failed (requested=%d, result=%d)", in_length, result);
 739                         return -1;
 740                 }
 741         } else {
 742                 LOG_ERROR("usb_bulk_write failed (requested=%d, result=%d)", out_length, result);
 743                 return -1;
 744         }
 745 }
 746
 747 /* Write data from out_buffer to USB. */
 748 int opendous_usb_write(struct opendous_jtag *opendous_jtag, int out_length)
 749 {
 750         int result;
 751
 752         if (out_length > OPENDOUS_OUT_BUFFER_SIZE) {
 753                 LOG_ERROR("opendous_jtag_write illegal out_length=%d (max=%d)", out_length, OPENDOUS_OUT_BUFFER_SIZE);
 754                 return -1;
 755         }
 756
 757 #ifdef _DEBUG_USB_COMMS_
 758         LOG_DEBUG("USB write begin");
 759 #endif
 760         if (opendous_probe->CONTROL_TRANSFER) {
 761                 result = jtag_libusb_control_transfer(opendous_jtag->usb_handle,
 762                         LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_OUT,
 763                         FUNC_WRITE_DATA, 0, 0, (char *) usb_out_buffer, out_length, OPENDOUS_USB_TIMEOUT);
 764         } else {
 765                 result = jtag_libusb_bulk_write(opendous_jtag->usb_handle, OPENDOUS_WRITE_ENDPOINT, \
 766                         (char *)usb_out_buffer, out_length, OPENDOUS_USB_TIMEOUT);
 767         }
 768 #ifdef _DEBUG_USB_COMMS_
 769         LOG_DEBUG("USB write end: %d bytes", result);
 770 #endif
 771
 772         DEBUG_JTAG_IO("opendous_usb_write, out_length = %d, result = %d", out_length, result);
 773
 774 #ifdef _DEBUG_USB_COMMS_
 775         opendous_debug_buffer(usb_out_buffer, out_length);
 776 #endif
 777         return result;
 778 }
 779
 780 /* Read data from USB into in_buffer. */
 781 int opendous_usb_read(struct opendous_jtag *opendous_jtag)
 782 {
 783 #ifdef _DEBUG_USB_COMMS_
 784         LOG_DEBUG("USB read begin");
 785 #endif
 786         int result;
 787         if (opendous_probe->CONTROL_TRANSFER) {
 788                 result = jtag_libusb_control_transfer(opendous_jtag->usb_handle,
 789                         LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_IN,
 790                         FUNC_READ_DATA, 0, 0, (char *) usb_in_buffer, OPENDOUS_IN_BUFFER_SIZE, OPENDOUS_USB_TIMEOUT);
 791         } else {
 792                 result = jtag_libusb_bulk_read(opendous_jtag->usb_handle, OPENDOUS_READ_ENDPOINT,
 793                         (char *)usb_in_buffer, OPENDOUS_IN_BUFFER_SIZE, OPENDOUS_USB_TIMEOUT);
 794         }
 795 #ifdef _DEBUG_USB_COMMS_
 796         LOG_DEBUG("USB read end: %d bytes", result);
 797 #endif
 798         DEBUG_JTAG_IO("opendous_usb_read, result = %d", result);
 799
 800 #ifdef _DEBUG_USB_COMMS_
 801         opendous_debug_buffer(usb_in_buffer, result);
 802 #endif
 803         return result;
 804 }
 805
 806 #ifdef _DEBUG_USB_COMMS_
 807 #define BYTES_PER_LINE  16
 808
 809 void opendous_debug_buffer(uint8_t *buffer, int length)
 810 {
 811         char line[81];
 812         char s[4];
 813         int i;
 814         int j;
 815
 816         for (i = 0; i < length; i += BYTES_PER_LINE) {
 817                 snprintf(line, 5, "%04x", i);
 818                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++) {
 819                         snprintf(s, 4, " %02x", buffer[j]);
 820                         strcat(line, s);
 821                 }
 822                 LOG_DEBUG("%s", line);
 823         }
 824 }
 825 #endif