git.sur5r.net Git - openocd/blob - src/jtag/drivers/vsllink.c

   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 <jtag/swd.h>
  32 #include <libusb.h>
  33
  34 #include "versaloon/versaloon_include.h"
  35 #include "versaloon/versaloon.h"
  36
  37 static int vsllink_tms_offset;
  38
  39 struct pending_scan_result {
  40         int src_offset;
  41         int dest_offset;
  42         int length;     /* Number of bits to read */
  43         struct scan_command *command;   /* Corresponding scan command */
  44         uint8_t *ack;
  45         uint8_t *buffer;
  46         bool last;      /* indicate the last scan pending */
  47 };
  48
  49 #define MAX_PENDING_SCAN_RESULTS 256
  50
  51 static int pending_scan_results_length;
  52 static struct pending_scan_result
  53         pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
  54
  55 /* Queue command functions */
  56 static void vsllink_end_state(tap_state_t state);
  57 static void vsllink_state_move(void);
  58 static void vsllink_path_move(int num_states, tap_state_t *path);
  59 static void vsllink_tms(int num_bits, const uint8_t *bits);
  60 static void vsllink_runtest(int num_cycles);
  61 static void vsllink_stableclocks(int num_cycles, int tms);
  62 static void vsllink_scan(bool ir_scan, enum scan_type type,
  63                 uint8_t *buffer, int scan_size, struct scan_command *command);
  64 static void vsllink_reset(int trst, int srst);
  65
  66 /* VSLLink tap buffer functions */
  67 static void vsllink_tap_append_step(int tms, int tdi);
  68 static void vsllink_tap_init(void);
  69 static int  vsllink_tap_execute(void);
  70 static void vsllink_tap_ensure_pending(int scans);
  71 static void vsllink_tap_append_scan(int length, uint8_t *buffer,
  72                 struct scan_command *command);
  73
  74 /* VSLLink SWD functions */
  75 static int_least32_t vsllink_swd_frequency(struct adiv5_dap *dap,
  76                 int_least32_t hz);
  77 static int vsllink_swd_switch_seq(struct adiv5_dap *dap,
  78                 enum swd_special_seq seq);
  79
  80 /* VSLLink lowlevel functions */
  81 struct vsllink {
  82         struct libusb_context *libusb_ctx;
  83         struct libusb_device_handle *usb_device_handle;
  84 };
  85
  86 static int vsllink_usb_open(struct vsllink *vsllink);
  87 static void vsllink_usb_close(struct vsllink *vsllink);
  88
  89 #if defined _DEBUG_JTAG_IO_
  90 static void vsllink_debug_buffer(uint8_t *buffer, int length);
  91 #endif
  92
  93 static int tap_length;
  94 static int tap_buffer_size;
  95 static uint8_t *tms_buffer;
  96 static uint8_t *tdi_buffer;
  97 static uint8_t *tdo_buffer;
  98
  99 static bool swd_mode;
 100
 101 static struct vsllink *vsllink_handle;
 102
 103 static int vsllink_execute_queue(void)
 104 {
 105         struct jtag_command *cmd = jtag_command_queue;
 106         int scan_size;
 107         enum scan_type type;
 108         uint8_t *buffer;
 109
 110         DEBUG_JTAG_IO("-------------------------------------"
 111                 " vsllink "
 112                 "-------------------------------------");
 113
 114         while (cmd != NULL) {
 115                 switch (cmd->type) {
 116                         case JTAG_RUNTEST:
 117                                 DEBUG_JTAG_IO("runtest %i cycles, end in %s",
 118                                                 cmd->cmd.runtest->num_cycles,
 119                                                 tap_state_name(cmd->cmd.runtest->end_state));
 120
 121                                 vsllink_end_state(cmd->cmd.runtest->end_state);
 122                                 vsllink_runtest(cmd->cmd.runtest->num_cycles);
 123                                 break;
 124
 125                         case JTAG_TLR_RESET:
 126                                 DEBUG_JTAG_IO("statemove end in %s",
 127                                                 tap_state_name(cmd->cmd.statemove->end_state));
 128
 129                                 vsllink_end_state(cmd->cmd.statemove->end_state);
 130                                 vsllink_state_move();
 131                                 break;
 132
 133                         case JTAG_PATHMOVE:
 134                                 DEBUG_JTAG_IO("pathmove: %i states, end in %s",
 135                                                 cmd->cmd.pathmove->num_states,
 136                                                 tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
 137
 138                                 vsllink_path_move(cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path);
 139                                 break;
 140
 141                         case JTAG_SCAN:
 142                                 DEBUG_JTAG_IO("JTAG Scan...");
 143
 144                                 vsllink_end_state(cmd->cmd.scan->end_state);
 145
 146                                 scan_size = jtag_build_buffer(
 147                                                 cmd->cmd.scan, &buffer);
 148
 149                                 if (cmd->cmd.scan->ir_scan)
 150                                         DEBUG_JTAG_IO(
 151                                                         "JTAG Scan write IR(%d bits), "
 152                                                         "end in %s:",
 153                                                         scan_size,
 154                                                         tap_state_name(cmd->cmd.scan->end_state));
 155
 156                                 else
 157                                         DEBUG_JTAG_IO(
 158                                                         "JTAG Scan write DR(%d bits), "
 159                                                         "end in %s:",
 160                                                         scan_size,
 161                                                         tap_state_name(cmd->cmd.scan->end_state));
 162
 163 #ifdef _DEBUG_JTAG_IO_
 164                                 vsllink_debug_buffer(buffer,
 165                                                 DIV_ROUND_UP(scan_size, 8));
 166 #endif
 167
 168                                 type = jtag_scan_type(cmd->cmd.scan);
 169
 170                                 vsllink_scan(cmd->cmd.scan->ir_scan,
 171                                                 type, buffer, scan_size,
 172                                                 cmd->cmd.scan);
 173                                 break;
 174
 175                         case JTAG_RESET:
 176                                 DEBUG_JTAG_IO("reset trst: %i srst %i",
 177                                                 cmd->cmd.reset->trst,
 178                                                 cmd->cmd.reset->srst);
 179
 180                                 vsllink_tap_execute();
 181
 182                                 if (cmd->cmd.reset->trst == 1)
 183                                         tap_set_state(TAP_RESET);
 184
 185                                 vsllink_reset(cmd->cmd.reset->trst,
 186                                                 cmd->cmd.reset->srst);
 187                                 break;
 188
 189                         case JTAG_SLEEP:
 190                                 DEBUG_JTAG_IO("sleep %i", cmd->cmd.sleep->us);
 191                                 vsllink_tap_execute();
 192                                 jtag_sleep(cmd->cmd.sleep->us);
 193                                 break;
 194
 195                         case JTAG_STABLECLOCKS:
 196                                 DEBUG_JTAG_IO("add %d clocks",
 197                                                 cmd->cmd.stableclocks->num_cycles);
 198
 199                                 switch (tap_get_state()) {
 200                                 case TAP_RESET:
 201                                         /* tms must be '1' to stay
 202                                          * n TAP_RESET mode
 203                                          */
 204                                         scan_size = 1;
 205                                         break;
 206                                 case TAP_DRSHIFT:
 207                                 case TAP_IDLE:
 208                                 case TAP_DRPAUSE:
 209                                 case TAP_IRSHIFT:
 210                                 case TAP_IRPAUSE:
 211                                         /* else, tms should be '0' */
 212                                         scan_size = 0;
 213                                         break;
 214                                 /* above stable states are OK */
 215                                 default:
 216                                         LOG_ERROR("jtag_add_clocks() "
 217                                                         "in non-stable state \"%s\"",
 218                                                         tap_state_name(tap_get_state())
 219                                         );
 220                                         exit(-1);
 221                                 }
 222                                 vsllink_stableclocks(cmd->cmd.stableclocks->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         if (swd_mode)
 246                 return ERROR_OK;
 247
 248         versaloon_interface.adaptors.jtag_raw.config(0, (uint16_t)speed);
 249         return versaloon_interface.adaptors.peripheral_commit();
 250 }
 251
 252 static int vsllink_khz(int khz, int *jtag_speed)
 253 {
 254         *jtag_speed = khz;
 255
 256         return ERROR_OK;
 257 }
 258
 259 static int vsllink_speed_div(int jtag_speed, int *khz)
 260 {
 261         *khz = jtag_speed;
 262
 263         return ERROR_OK;
 264 }
 265
 266 static void vsllink_free_buffer(void)
 267 {
 268         if (tdi_buffer != NULL) {
 269                 free(tdi_buffer);
 270                 tdi_buffer = NULL;
 271         }
 272         if (tdo_buffer != NULL) {
 273                 free(tdo_buffer);
 274                 tdo_buffer = NULL;
 275         }
 276         if (tms_buffer != NULL) {
 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
 288         if (swd_mode)
 289                 versaloon_interface.adaptors.swd.fini(0);
 290         else
 291                 versaloon_interface.adaptors.jtag_raw.fini(0);
 292
 293         versaloon_interface.adaptors.peripheral_commit();
 294         versaloon_interface.fini();
 295
 296         vsllink_free_buffer();
 297         vsllink_usb_close(vsllink_handle);
 298
 299         free(vsllink_handle);
 300
 301         return ERROR_OK;
 302 }
 303
 304 static int vsllink_interface_init(void)
 305 {
 306         vsllink_handle = malloc(sizeof(struct vsllink));
 307         if (NULL == vsllink_handle) {
 308                 LOG_ERROR("unable to allocate memory");
 309                 return ERROR_FAIL;
 310         }
 311
 312         libusb_init(&vsllink_handle->libusb_ctx);
 313
 314         if (ERROR_OK != vsllink_usb_open(vsllink_handle)) {
 315                 LOG_ERROR("Can't find USB JTAG Interface!" \
 316                         "Please check connection and permissions.");
 317                 return ERROR_JTAG_INIT_FAILED;
 318         }
 319         LOG_DEBUG("vsllink found on %04X:%04X",
 320                 versaloon_interface.usb_setting.vid,
 321                 versaloon_interface.usb_setting.pid);
 322         versaloon_usb_device_handle = vsllink_handle->usb_device_handle;
 323
 324         if (ERROR_OK != versaloon_interface.init())
 325                 return ERROR_FAIL;
 326         if (versaloon_interface.usb_setting.buf_size < 32) {
 327                 versaloon_interface.fini();
 328                 return ERROR_FAIL;
 329         }
 330
 331         return ERROR_OK;
 332 }
 333
 334 static int vsllink_init(void)
 335 {
 336         int retval = vsllink_interface_init();
 337         if (ERROR_OK != retval)
 338                 return retval;
 339
 340         versaloon_interface.adaptors.gpio.init(0);
 341         versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, 0, GPIO_SRST,
 342                 GPIO_SRST);
 343         versaloon_interface.adaptors.delay.delayms(100);
 344         versaloon_interface.adaptors.peripheral_commit();
 345
 346         if (swd_mode) {
 347                 versaloon_interface.adaptors.gpio.config(0, GPIO_TRST, 0,
 348                         GPIO_TRST, GPIO_TRST);
 349                 versaloon_interface.adaptors.swd.init(0);
 350                 vsllink_swd_frequency(NULL, jtag_get_speed_khz() * 1000);
 351                 vsllink_swd_switch_seq(NULL, JTAG_TO_SWD);
 352
 353         } else {
 354                 /* malloc buffer size for tap */
 355                 tap_buffer_size = versaloon_interface.usb_setting.buf_size / 2 - 32;
 356                 vsllink_free_buffer();
 357                 tdi_buffer = malloc(tap_buffer_size);
 358                 tdo_buffer = malloc(tap_buffer_size);
 359                 tms_buffer = malloc(tap_buffer_size);
 360                 if ((NULL == tdi_buffer) || (NULL == tdo_buffer) || (NULL == tms_buffer)) {
 361                         vsllink_quit();
 362                         return ERROR_FAIL;
 363                 }
 364
 365                 versaloon_interface.adaptors.jtag_raw.init(0);
 366                 versaloon_interface.adaptors.jtag_raw.config(0, jtag_get_speed_khz());
 367                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
 368                         GPIO_TRST, GPIO_SRST, GPIO_SRST);
 369         }
 370
 371         if (ERROR_OK != versaloon_interface.adaptors.peripheral_commit())
 372                 return ERROR_FAIL;
 373
 374         vsllink_reset(0, 0);
 375         vsllink_tap_init();
 376         return ERROR_OK;
 377 }
 378
 379 /**************************************************************************
 380  * Queue command implementations */
 381
 382 static void vsllink_end_state(tap_state_t state)
 383 {
 384         if (tap_is_state_stable(state))
 385                 tap_set_end_state(state);
 386         else {
 387                 LOG_ERROR("BUG: %i is not a valid end state", state);
 388                 exit(-1);
 389         }
 390 }
 391
 392 /* Goes to the end state. */
 393 static void vsllink_state_move(void)
 394 {
 395         int i;
 396         uint8_t tms_scan = tap_get_tms_path(tap_get_state(),
 397                         tap_get_end_state());
 398         uint8_t tms_scan_bits = tap_get_tms_path_len(tap_get_state(),
 399                         tap_get_end_state());
 400
 401         for (i = 0; i < tms_scan_bits; i++)
 402                 vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 403
 404         tap_set_state(tap_get_end_state());
 405 }
 406
 407 static void vsllink_path_move(int num_states, tap_state_t *path)
 408 {
 409         for (int i = 0; i < num_states; i++) {
 410                 if (path[i] == tap_state_transition(tap_get_state(), false))
 411                         vsllink_tap_append_step(0, 0);
 412                 else if (path[i] == tap_state_transition(tap_get_state(), true))
 413                         vsllink_tap_append_step(1, 0);
 414                 else {
 415                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 416                                 tap_state_name(tap_get_state()),
 417                                 tap_state_name(path[i]));
 418                         exit(-1);
 419                 }
 420
 421                 tap_set_state(path[i]);
 422         }
 423
 424         tap_set_end_state(tap_get_state());
 425 }
 426
 427 static void vsllink_tms(int num_bits, const uint8_t *bits)
 428 {
 429         for (int i = 0; i < num_bits; i++)
 430                 vsllink_tap_append_step((bits[i / 8] >> (i % 8)) & 1, 0);
 431 }
 432
 433 static void vsllink_stableclocks(int num_cycles, int tms)
 434 {
 435         while (num_cycles > 0) {
 436                 vsllink_tap_append_step(tms, 0);
 437                 num_cycles--;
 438         }
 439 }
 440
 441 static void vsllink_runtest(int num_cycles)
 442 {
 443         tap_state_t saved_end_state = tap_get_end_state();
 444
 445         if (tap_get_state() != TAP_IDLE) {
 446                 /* enter IDLE state */
 447                 vsllink_end_state(TAP_IDLE);
 448                 vsllink_state_move();
 449         }
 450
 451         vsllink_stableclocks(num_cycles, 0);
 452
 453         /* post-process */
 454         /* set end_state */
 455         vsllink_end_state(saved_end_state);
 456         if (tap_get_end_state() != tap_get_end_state())
 457                 vsllink_state_move();
 458 }
 459
 460 static void vsllink_scan(bool ir_scan, enum scan_type type, uint8_t *buffer,
 461         int scan_size, struct scan_command *command)
 462 {
 463         tap_state_t saved_end_state;
 464
 465         saved_end_state = tap_get_end_state();
 466
 467         /* Move to appropriate scan state */
 468         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
 469
 470         if (tap_get_state() != tap_get_end_state())
 471                 vsllink_state_move();
 472         vsllink_end_state(saved_end_state);
 473
 474         /* Scan */
 475         vsllink_tap_append_scan(scan_size, buffer, command);
 476
 477         /* Goto Pause and record position to insert tms:0 */
 478         vsllink_tap_append_step(0, 0);
 479         vsllink_tms_offset = tap_length;
 480
 481         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
 482
 483         if (tap_get_state() != tap_get_end_state())
 484                 vsllink_state_move();
 485 }
 486
 487 static void vsllink_reset(int trst, int srst)
 488 {
 489         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
 490
 491         if (!srst)
 492                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, 0, GPIO_SRST, GPIO_SRST);
 493         else
 494                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, GPIO_SRST, 0, 0);
 495
 496         if (!swd_mode) {
 497                 if (!trst)
 498                         versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, GPIO_TRST);
 499                 else
 500                         versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, 0);
 501         }
 502
 503         versaloon_interface.adaptors.peripheral_commit();
 504 }
 505
 506 COMMAND_HANDLER(vsllink_handle_usb_vid_command)
 507 {
 508         if (CMD_ARGC != 1)
 509                 return ERROR_COMMAND_SYNTAX_ERROR;
 510
 511         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0],
 512                 versaloon_interface.usb_setting.vid);
 513         return ERROR_OK;
 514 }
 515
 516 COMMAND_HANDLER(vsllink_handle_usb_pid_command)
 517 {
 518         if (CMD_ARGC != 1)
 519                 return ERROR_COMMAND_SYNTAX_ERROR;
 520         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0],
 521                 versaloon_interface.usb_setting.pid);
 522         return ERROR_OK;
 523 }
 524
 525 COMMAND_HANDLER(vsllink_handle_usb_serial_command)
 526 {
 527         if (CMD_ARGC > 1)
 528                 return ERROR_COMMAND_SYNTAX_ERROR;
 529
 530         free(versaloon_interface.usb_setting.serialstring);
 531
 532         if (CMD_ARGC == 1)
 533                 versaloon_interface.usb_setting.serialstring = strdup(CMD_ARGV[0]);
 534         else
 535                 versaloon_interface.usb_setting.serialstring = NULL;
 536
 537         return ERROR_OK;
 538 }
 539
 540 COMMAND_HANDLER(vsllink_handle_usb_bulkin_command)
 541 {
 542         if (CMD_ARGC != 1)
 543                 return ERROR_COMMAND_SYNTAX_ERROR;
 544
 545         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 546                 versaloon_interface.usb_setting.ep_in);
 547
 548         versaloon_interface.usb_setting.ep_in |= 0x80;
 549
 550         return ERROR_OK;
 551 }
 552
 553 COMMAND_HANDLER(vsllink_handle_usb_bulkout_command)
 554 {
 555         if (CMD_ARGC != 1)
 556                 return ERROR_COMMAND_SYNTAX_ERROR;
 557
 558         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 559                 versaloon_interface.usb_setting.ep_out);
 560
 561         versaloon_interface.usb_setting.ep_out &= ~0x80;
 562
 563         return ERROR_OK;
 564 }
 565
 566 COMMAND_HANDLER(vsllink_handle_usb_interface_command)
 567 {
 568         if (CMD_ARGC != 1)
 569                 return ERROR_COMMAND_SYNTAX_ERROR;
 570
 571         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 572                 versaloon_interface.usb_setting.interface);
 573         return ERROR_OK;
 574 }
 575
 576 /**************************************************************************
 577  * VSLLink tap functions */
 578
 579 static void vsllink_tap_init(void)
 580 {
 581         tap_length = 0;
 582         pending_scan_results_length = 0;
 583         vsllink_tms_offset = 0;
 584 }
 585
 586 static void vsllink_tap_ensure_pending(int scans)
 587 {
 588         int available_scans =
 589                 MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
 590
 591         if (scans > available_scans)
 592                 vsllink_tap_execute();
 593 }
 594
 595 static void vsllink_tap_append_step(int tms, int tdi)
 596 {
 597         int index_var = tap_length / 8;
 598
 599         int bit_index = tap_length % 8;
 600         uint8_t bit = 1 << bit_index;
 601
 602         if (tms)
 603                 tms_buffer[index_var] |= bit;
 604         else
 605                 tms_buffer[index_var] &= ~bit;
 606
 607         if (tdi)
 608                 tdi_buffer[index_var] |= bit;
 609         else
 610                 tdi_buffer[index_var] &= ~bit;
 611
 612         tap_length++;
 613
 614         if (tap_buffer_size * 8 <= tap_length)
 615                 vsllink_tap_execute();
 616 }
 617
 618 static void vsllink_tap_append_scan(int length, uint8_t *buffer,
 619         struct scan_command *command)
 620 {
 621         struct pending_scan_result *pending_scan_result;
 622         int len_tmp, len_all, i;
 623
 624         len_all = 0;
 625         while (len_all < length) {
 626                 vsllink_tap_ensure_pending(1);
 627                 pending_scan_result =
 628                         &pending_scan_results_buffer[
 629                                 pending_scan_results_length];
 630
 631                 if ((length - len_all) > (tap_buffer_size * 8 - tap_length)) {
 632                         /* Use all memory available
 633                            vsllink_tap_append_step will commit automatically */
 634                         len_tmp = tap_buffer_size * 8 - tap_length;
 635                         pending_scan_result->last = false;
 636                 } else {
 637                         len_tmp = length - len_all;
 638                         pending_scan_result->last = true;
 639                 }
 640                 pending_scan_result->src_offset = tap_length;
 641                 pending_scan_result->dest_offset = len_all;
 642                 pending_scan_result->length = len_tmp;
 643                 pending_scan_result->command = command;
 644                 pending_scan_result->buffer = buffer;
 645                 pending_scan_results_length++;
 646
 647                 for (i = 0; i < len_tmp; i++) {
 648                         vsllink_tap_append_step(((len_all + i) < length-1
 649                                                  ? 0 : 1),
 650                                 (buffer[(len_all + i)/8]
 651                                  >> ((len_all + i)%8)) & 1);
 652                 }
 653
 654                 len_all += len_tmp;
 655         }
 656 }
 657
 658 static int vsllink_jtag_execute(void)
 659 {
 660         int i;
 661         int result;
 662
 663         if (tap_length <= 0)
 664                 return ERROR_OK;
 665
 666         versaloon_interface.adaptors.jtag_raw.execute(0, tdi_buffer, tms_buffer,
 667                 tdo_buffer, tap_length);
 668
 669         result = versaloon_interface.adaptors.peripheral_commit();
 670
 671         if (result == ERROR_OK) {
 672                 for (i = 0; i < pending_scan_results_length; i++) {
 673                         struct pending_scan_result *pending_scan_result =
 674                                 &pending_scan_results_buffer[i];
 675                         uint8_t *buffer = pending_scan_result->buffer;
 676                         int length = pending_scan_result->length;
 677                         int src_first = pending_scan_result->src_offset;
 678                         int dest_first = pending_scan_result->dest_offset;
 679                         bool last = pending_scan_result->last;
 680
 681                         struct scan_command *command;
 682
 683                         command = pending_scan_result->command;
 684                         buf_set_buf(tdo_buffer, src_first, buffer, dest_first, length);
 685
 686 #ifdef _DEBUG_JTAG_IO_
 687                         DEBUG_JTAG_IO(
 688                                 "JTAG scan read(%d bits, from src %d bits to dest %d bits):",
 689                                 length, src_first, dest_first);
 690                         vsllink_debug_buffer(buffer + dest_first / 8,
 691                                 DIV_ROUND_UP(length, 7));
 692 #endif
 693
 694                         if (last) {
 695                                 if (jtag_read_buffer(buffer, command)
 696                                     != ERROR_OK) {
 697                                         vsllink_tap_init();
 698                                         return ERROR_JTAG_QUEUE_FAILED;
 699                                 }
 700
 701                                 if (pending_scan_result->buffer != NULL)
 702                                         free(pending_scan_result->buffer);
 703                         }
 704                 }
 705         } else {
 706                 LOG_ERROR("vsllink_jtag_execute failure");
 707                 return ERROR_JTAG_QUEUE_FAILED;
 708         }
 709
 710         vsllink_tap_init();
 711
 712         return ERROR_OK;
 713 }
 714
 715 static int vsllink_tap_execute(void)
 716 {
 717         if (swd_mode)
 718                 return ERROR_OK;
 719
 720         return vsllink_jtag_execute();
 721 }
 722
 723 static int vsllink_swd_init(void)
 724 {
 725         LOG_INFO("VSLLink SWD mode enabled");
 726         swd_mode = true;
 727
 728         return ERROR_OK;
 729 }
 730
 731 static int_least32_t vsllink_swd_frequency(struct adiv5_dap *dap,
 732                 int_least32_t hz)
 733 {
 734         const int_least32_t delay2hz[] = {
 735                 1850000, 235000, 130000, 102000, 85000, 72000
 736         };
 737
 738         if (hz > 0) {
 739                 uint16_t delay = UINT16_MAX;
 740
 741                 for (uint16_t i = 0; i < ARRAY_SIZE(delay2hz); i++) {
 742                         if (hz >= delay2hz[i]) {
 743                                 hz = delay2hz[i];
 744                                 delay = i;
 745                                 break;
 746                         }
 747                 }
 748
 749                 if (delay == UINT16_MAX)
 750                         delay = (500000 / hz) - 1;
 751
 752                 /* Calculate retry count after a WAIT response. This will give
 753                  * a retry timeout at about ~250 ms. 54 is the number of bits
 754                  * found in a transaction. */
 755                 uint16_t retry_count = 250 * hz / 1000 / 54;
 756
 757                 LOG_DEBUG("SWD delay: %d, retry count: %d", delay, retry_count);
 758
 759                 versaloon_interface.adaptors.swd.config(0, 2, retry_count, delay);
 760         }
 761
 762         return hz;
 763 }
 764
 765 static int vsllink_swd_switch_seq(struct adiv5_dap *dap,
 766                 enum swd_special_seq seq)
 767 {
 768         switch (seq) {
 769         case LINE_RESET:
 770                 LOG_DEBUG("SWD line reset");
 771                 versaloon_interface.adaptors.swd.seqout(0, swd_seq_line_reset,
 772                                 swd_seq_line_reset_len);
 773                 break;
 774         case JTAG_TO_SWD:
 775                 LOG_DEBUG("JTAG-to-SWD");
 776                 versaloon_interface.adaptors.swd.seqout(0, swd_seq_jtag_to_swd,
 777                                 swd_seq_jtag_to_swd_len);
 778                 break;
 779         case SWD_TO_JTAG:
 780                 LOG_DEBUG("SWD-to-JTAG");
 781                 versaloon_interface.adaptors.swd.seqout(0, swd_seq_swd_to_jtag,
 782                                 swd_seq_swd_to_jtag_len);
 783                 break;
 784         default:
 785                 LOG_ERROR("Sequence %d not supported", seq);
 786                 return ERROR_FAIL;
 787         }
 788
 789         return ERROR_OK;
 790 }
 791
 792 static void vsllink_swd_read_reg(struct adiv5_dap *dap, uint8_t cmd,
 793                 uint32_t *value)
 794 {
 795         versaloon_interface.adaptors.swd.transact(0, cmd, value, NULL);
 796 }
 797
 798 static void vsllink_swd_write_reg(struct adiv5_dap *dap, uint8_t cmd,
 799                 uint32_t value)
 800 {
 801         versaloon_interface.adaptors.swd.transact(0, cmd, &value, NULL);
 802 }
 803
 804 static int vsllink_swd_run_queue(struct adiv5_dap *dap)
 805 {
 806         return versaloon_interface.adaptors.peripheral_commit();
 807 }
 808
 809 /****************************************************************************
 810  * VSLLink USB low-level functions */
 811
 812 static int vsllink_check_usb_strings(
 813         struct libusb_device_handle *usb_device_handle,
 814         struct libusb_device_descriptor *usb_desc)
 815 {
 816         char desc_string[256];
 817         int retval;
 818
 819         if (NULL != versaloon_interface.usb_setting.serialstring) {
 820                 retval = libusb_get_string_descriptor_ascii(usb_device_handle,
 821                         usb_desc->iSerialNumber, (unsigned char *)desc_string,
 822                         sizeof(desc_string));
 823                 if (retval < 0)
 824                         return ERROR_FAIL;
 825
 826                 if (strncmp(desc_string, versaloon_interface.usb_setting.serialstring,
 827                                 sizeof(desc_string)))
 828                         return ERROR_FAIL;
 829         }
 830
 831         retval = libusb_get_string_descriptor_ascii(usb_device_handle,
 832                 usb_desc->iProduct, (unsigned char *)desc_string,
 833                 sizeof(desc_string));
 834         if (retval < 0)
 835                 return ERROR_FAIL;
 836
 837         if (strstr(desc_string, "Versaloon") == NULL)
 838                 return ERROR_FAIL;
 839
 840         return ERROR_OK;
 841 }
 842
 843 static int vsllink_usb_open(struct vsllink *vsllink)
 844 {
 845         ssize_t num_devices, i;
 846         libusb_device **usb_devices;
 847         struct libusb_device_descriptor usb_desc;
 848         struct libusb_device_handle *usb_device_handle;
 849         int retval;
 850
 851         num_devices = libusb_get_device_list(vsllink->libusb_ctx, &usb_devices);
 852
 853         if (num_devices <= 0)
 854                 return ERROR_FAIL;
 855
 856         for (i = 0; i < num_devices; i++) {
 857                 libusb_device *device = usb_devices[i];
 858
 859                 retval = libusb_get_device_descriptor(device, &usb_desc);
 860                 if (retval != 0)
 861                         continue;
 862
 863                 if (usb_desc.idVendor != versaloon_interface.usb_setting.vid ||
 864                         usb_desc.idProduct != versaloon_interface.usb_setting.pid)
 865                         continue;
 866
 867                 retval = libusb_open(device, &usb_device_handle);
 868                 if (retval != 0)
 869                         continue;
 870
 871                 retval = vsllink_check_usb_strings(usb_device_handle, &usb_desc);
 872                 if (ERROR_OK == retval)
 873                         break;
 874
 875                 libusb_close(usb_device_handle);
 876         }
 877
 878         libusb_free_device_list(usb_devices, 1);
 879
 880         if (i == num_devices)
 881                 return ERROR_FAIL;
 882
 883         retval = libusb_claim_interface(usb_device_handle,
 884                 versaloon_interface.usb_setting.interface);
 885         if (retval != 0) {
 886                 LOG_ERROR("unable to claim interface");
 887                 libusb_close(usb_device_handle);
 888                 return ERROR_FAIL;
 889         }
 890
 891         vsllink->usb_device_handle = usb_device_handle;
 892         return ERROR_OK;
 893 }
 894
 895 static void vsllink_usb_close(struct vsllink *vsllink)
 896 {
 897         libusb_release_interface(vsllink->usb_device_handle,
 898                 versaloon_interface.usb_setting.interface);
 899         libusb_close(vsllink->usb_device_handle);
 900 }
 901
 902 #define BYTES_PER_LINE  16
 903
 904 #if defined _DEBUG_JTAG_IO_
 905 static void vsllink_debug_buffer(uint8_t *buffer, int length)
 906 {
 907         char line[81];
 908         char s[4];
 909         int i;
 910         int j;
 911
 912         for (i = 0; i < length; i += BYTES_PER_LINE) {
 913                 snprintf(line, 5, "%04x", i);
 914                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++) {
 915                         snprintf(s, 4, " %02x", buffer[j]);
 916                         strcat(line, s);
 917                 }
 918                 LOG_DEBUG("%s", line);
 919         }
 920 }
 921 #endif  /* _DEBUG_JTAG_IO_ */
 922
 923 static const struct command_registration vsllink_command_handlers[] = {
 924         {
 925                 .name = "vsllink_usb_vid",
 926                 .handler = &vsllink_handle_usb_vid_command,
 927                 .mode = COMMAND_CONFIG,
 928         },
 929         {
 930                 .name = "vsllink_usb_pid",
 931                 .handler = &vsllink_handle_usb_pid_command,
 932                 .mode = COMMAND_CONFIG,
 933         },
 934         {
 935                 .name = "vsllink_usb_serial",
 936                 .handler = &vsllink_handle_usb_serial_command,
 937                 .mode = COMMAND_CONFIG,
 938         },
 939         {
 940                 .name = "vsllink_usb_bulkin",
 941                 .handler = &vsllink_handle_usb_bulkin_command,
 942                 .mode = COMMAND_CONFIG,
 943         },
 944         {
 945                 .name = "vsllink_usb_bulkout",
 946                 .handler = &vsllink_handle_usb_bulkout_command,
 947                 .mode = COMMAND_CONFIG,
 948         },
 949         {
 950                 .name = "vsllink_usb_interface",
 951                 .handler = &vsllink_handle_usb_interface_command,
 952                 .mode = COMMAND_CONFIG,
 953         },
 954         COMMAND_REGISTRATION_DONE
 955 };
 956
 957 static const char * const vsllink_transports[] = {"jtag", "swd", NULL};
 958
 959 static const struct swd_driver vsllink_swd_driver = {
 960         .init = vsllink_swd_init,
 961         .frequency = vsllink_swd_frequency,
 962         .switch_seq = vsllink_swd_switch_seq,
 963         .read_reg = vsllink_swd_read_reg,
 964         .write_reg = vsllink_swd_write_reg,
 965         .run = vsllink_swd_run_queue,
 966 };
 967
 968 struct jtag_interface vsllink_interface = {
 969         .name = "vsllink",
 970         .supported = DEBUG_CAP_TMS_SEQ,
 971         .commands = vsllink_command_handlers,
 972         .transports = vsllink_transports,
 973         .swd = &vsllink_swd_driver,
 974
 975         .init = vsllink_init,
 976         .quit = vsllink_quit,
 977         .khz = vsllink_khz,
 978         .speed = vsllink_speed,
 979         .speed_div = vsllink_speed_div,
 980         .execute_queue = vsllink_execute_queue,
 981 };