src/jtag/drivers/vsllink.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2009-2010 by Simon Qian <SimonQian@SimonQian.com>       *
   5  ***************************************************************************/
   6
   7 /* Versaloon is a programming tool for multiple MCUs.
   8  * It's distributed under GPLv3.
   9  * You can find it at http://www.Versaloon.com/.
  10  */
  11
  12 #ifdef HAVE_CONFIG_H
  13 #include "config.h"
  14 #endif
  15
  16 #include <jtag/adapter.h>
  17 #include <jtag/interface.h>
  18 #include <jtag/commands.h>
  19 #include <jtag/swd.h>
  20 #include <libusb.h>
  21
  22 #include "versaloon/versaloon_include.h"
  23 #include "versaloon/versaloon.h"
  24
  25 static int vsllink_tms_offset;
  26
  27 struct pending_scan_result {
  28         int src_offset;
  29         int dest_offset;
  30         int length;     /* Number of bits to read */
  31         struct scan_command *command;   /* Corresponding scan command */
  32         uint8_t *ack;
  33         uint8_t *buffer;
  34         bool last;      /* indicate the last scan pending */
  35 };
  36
  37 #define MAX_PENDING_SCAN_RESULTS 256
  38
  39 static int pending_scan_results_length;
  40 static struct pending_scan_result
  41         pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
  42
  43 /* Queue command functions */
  44 static void vsllink_end_state(tap_state_t state);
  45 static void vsllink_state_move(void);
  46 static void vsllink_path_move(int num_states, tap_state_t *path);
  47 static void vsllink_tms(int num_bits, const uint8_t *bits);
  48 static void vsllink_runtest(int num_cycles);
  49 static void vsllink_stableclocks(int num_cycles, int tms);
  50 static void vsllink_scan(bool ir_scan, enum scan_type type,
  51                 uint8_t *buffer, int scan_size, struct scan_command *command);
  52 static int vsllink_reset(int trst, int srst);
  53
  54 /* VSLLink tap buffer functions */
  55 static void vsllink_tap_append_step(int tms, int tdi);
  56 static void vsllink_tap_init(void);
  57 static int  vsllink_tap_execute(void);
  58 static void vsllink_tap_ensure_pending(int scans);
  59 static void vsllink_tap_append_scan(int length, uint8_t *buffer,
  60                 struct scan_command *command);
  61
  62 /* VSLLink SWD functions */
  63 static int_least32_t vsllink_swd_frequency(int_least32_t hz);
  64 static int vsllink_swd_switch_seq(enum swd_special_seq seq);
  65
  66 /* VSLLink lowlevel functions */
  67 struct vsllink {
  68         struct libusb_context *libusb_ctx;
  69         struct libusb_device_handle *usb_device_handle;
  70 };
  71
  72 static int vsllink_usb_open(struct vsllink *vsllink);
  73 static void vsllink_usb_close(struct vsllink *vsllink);
  74
  75 static void vsllink_debug_buffer(uint8_t *buffer, int length);
  76
  77 static int tap_length;
  78 static int tap_buffer_size;
  79 static uint8_t *tms_buffer;
  80 static uint8_t *tdi_buffer;
  81 static uint8_t *tdo_buffer;
  82
  83 static bool swd_mode;
  84
  85 static struct vsllink *vsllink_handle;
  86
  87 static int vsllink_execute_queue(struct jtag_command *cmd_queue)
  88 {
  89         struct jtag_command *cmd = cmd_queue;
  90         int scan_size;
  91         enum scan_type type;
  92         uint8_t *buffer;
  93
  94         LOG_DEBUG_IO("-------------------------------------"
  95                 " vsllink "
  96                 "-------------------------------------");
  97
  98         while (cmd) {
  99                 switch (cmd->type) {
 100                         case JTAG_RUNTEST:
 101                                 LOG_DEBUG_IO("runtest %i cycles, end in %s",
 102                                                 cmd->cmd.runtest->num_cycles,
 103                                                 tap_state_name(cmd->cmd.runtest->end_state));
 104
 105                                 vsllink_end_state(cmd->cmd.runtest->end_state);
 106                                 vsllink_runtest(cmd->cmd.runtest->num_cycles);
 107                                 break;
 108
 109                         case JTAG_TLR_RESET:
 110                                 LOG_DEBUG_IO("statemove end in %s",
 111                                                 tap_state_name(cmd->cmd.statemove->end_state));
 112
 113                                 vsllink_end_state(cmd->cmd.statemove->end_state);
 114                                 vsllink_state_move();
 115                                 break;
 116
 117                         case JTAG_PATHMOVE:
 118                                 LOG_DEBUG_IO("pathmove: %i states, end in %s",
 119                                                 cmd->cmd.pathmove->num_states,
 120                                                 tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
 121
 122                                 vsllink_path_move(cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path);
 123                                 break;
 124
 125                         case JTAG_SCAN:
 126                                 LOG_DEBUG_IO("JTAG Scan...");
 127
 128                                 vsllink_end_state(cmd->cmd.scan->end_state);
 129
 130                                 scan_size = jtag_build_buffer(
 131                                                 cmd->cmd.scan, &buffer);
 132
 133                                 if (cmd->cmd.scan->ir_scan)
 134                                         LOG_DEBUG_IO(
 135                                                         "JTAG Scan write IR(%d bits), "
 136                                                         "end in %s:",
 137                                                         scan_size,
 138                                                         tap_state_name(cmd->cmd.scan->end_state));
 139
 140                                 else
 141                                         LOG_DEBUG_IO(
 142                                                         "JTAG Scan write DR(%d bits), "
 143                                                         "end in %s:",
 144                                                         scan_size,
 145                                                         tap_state_name(cmd->cmd.scan->end_state));
 146
 147                                 if (LOG_LEVEL_IS(LOG_LVL_DEBUG_IO))
 148                                         vsllink_debug_buffer(buffer, DIV_ROUND_UP(scan_size, 8));
 149
 150                                 type = jtag_scan_type(cmd->cmd.scan);
 151
 152                                 vsllink_scan(cmd->cmd.scan->ir_scan,
 153                                                 type, buffer, scan_size,
 154                                                 cmd->cmd.scan);
 155                                 break;
 156
 157                         case JTAG_SLEEP:
 158                                 LOG_DEBUG_IO("sleep %" PRIu32, cmd->cmd.sleep->us);
 159                                 vsllink_tap_execute();
 160                                 jtag_sleep(cmd->cmd.sleep->us);
 161                                 break;
 162
 163                         case JTAG_STABLECLOCKS:
 164                                 LOG_DEBUG_IO("add %d clocks",
 165                                                 cmd->cmd.stableclocks->num_cycles);
 166
 167                                 switch (tap_get_state()) {
 168                                 case TAP_RESET:
 169                                         /* tms must be '1' to stay
 170                                          * n TAP_RESET mode
 171                                          */
 172                                         scan_size = 1;
 173                                         break;
 174                                 case TAP_DRSHIFT:
 175                                 case TAP_IDLE:
 176                                 case TAP_DRPAUSE:
 177                                 case TAP_IRSHIFT:
 178                                 case TAP_IRPAUSE:
 179                                         /* else, tms should be '0' */
 180                                         scan_size = 0;
 181                                         break;
 182                                 /* above stable states are OK */
 183                                 default:
 184                                         LOG_ERROR("jtag_add_clocks() "
 185                                                         "in non-stable state \"%s\"",
 186                                                         tap_state_name(tap_get_state())
 187                                         );
 188                                         exit(-1);
 189                                 }
 190                                 vsllink_stableclocks(cmd->cmd.stableclocks->num_cycles, scan_size);
 191                                 break;
 192
 193                                 case JTAG_TMS:
 194                                         LOG_DEBUG_IO("add %d jtag tms",
 195                                                         cmd->cmd.tms->num_bits);
 196
 197                                         vsllink_tms(cmd->cmd.tms->num_bits, cmd->cmd.tms->bits);
 198                                         break;
 199
 200                                 default:
 201                                         LOG_ERROR("BUG: unknown JTAG command type "
 202                                                         "encountered: %d", cmd->type);
 203                                         exit(-1);
 204                 }
 205                 cmd = cmd->next;
 206         }
 207
 208         return vsllink_tap_execute();
 209 }
 210
 211 static int vsllink_speed(int speed)
 212 {
 213         if (swd_mode) {
 214                 vsllink_swd_frequency(speed * 1000);
 215                 return ERROR_OK;
 216         }
 217
 218         versaloon_interface.adaptors.jtag_raw.config(0, (uint16_t)speed);
 219         return versaloon_interface.adaptors.peripheral_commit();
 220 }
 221
 222 static int vsllink_khz(int khz, int *jtag_speed)
 223 {
 224         *jtag_speed = khz;
 225
 226         return ERROR_OK;
 227 }
 228
 229 static int vsllink_speed_div(int jtag_speed, int *khz)
 230 {
 231         *khz = jtag_speed;
 232
 233         return ERROR_OK;
 234 }
 235
 236 static void vsllink_free_buffer(void)
 237 {
 238         free(tdi_buffer);
 239         tdi_buffer = NULL;
 240
 241         free(tdo_buffer);
 242         tdo_buffer = NULL;
 243
 244         free(tms_buffer);
 245         tms_buffer = NULL;
 246 }
 247
 248 static int vsllink_quit(void)
 249 {
 250         versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
 251                 0, 0, GPIO_SRST | GPIO_TRST);
 252         versaloon_interface.adaptors.gpio.fini(0);
 253
 254         if (swd_mode)
 255                 versaloon_interface.adaptors.swd.fini(0);
 256         else
 257                 versaloon_interface.adaptors.jtag_raw.fini(0);
 258
 259         versaloon_interface.adaptors.peripheral_commit();
 260         versaloon_interface.fini();
 261
 262         vsllink_free_buffer();
 263         vsllink_usb_close(vsllink_handle);
 264
 265         libusb_exit(vsllink_handle->libusb_ctx);
 266         free(vsllink_handle);
 267
 268         return ERROR_OK;
 269 }
 270
 271 static int vsllink_interface_init(void)
 272 {
 273         vsllink_handle = malloc(sizeof(struct vsllink));
 274         if (!vsllink_handle) {
 275                 LOG_ERROR("unable to allocate memory");
 276                 return ERROR_FAIL;
 277         }
 278
 279         libusb_init(&vsllink_handle->libusb_ctx);
 280
 281         if (vsllink_usb_open(vsllink_handle) != ERROR_OK) {
 282                 LOG_ERROR("Can't find USB JTAG Interface!"
 283                         "Please check connection and permissions.");
 284                 return ERROR_JTAG_INIT_FAILED;
 285         }
 286         LOG_DEBUG("vsllink found on %04X:%04X",
 287                 versaloon_interface.usb_setting.vid,
 288                 versaloon_interface.usb_setting.pid);
 289         versaloon_usb_device_handle = vsllink_handle->usb_device_handle;
 290
 291         if (versaloon_interface.init() != ERROR_OK)
 292                 return ERROR_FAIL;
 293         if (versaloon_interface.usb_setting.buf_size < 32) {
 294                 versaloon_interface.fini();
 295                 return ERROR_FAIL;
 296         }
 297
 298         return ERROR_OK;
 299 }
 300
 301 static int vsllink_init(void)
 302 {
 303         int retval = vsllink_interface_init();
 304         if (retval != ERROR_OK)
 305                 return retval;
 306
 307         versaloon_interface.adaptors.gpio.init(0);
 308         versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, 0, GPIO_SRST,
 309                 GPIO_SRST);
 310         versaloon_interface.adaptors.delay.delayms(100);
 311         versaloon_interface.adaptors.peripheral_commit();
 312
 313         if (swd_mode) {
 314                 versaloon_interface.adaptors.gpio.config(0, GPIO_TRST, 0,
 315                         GPIO_TRST, GPIO_TRST);
 316                 versaloon_interface.adaptors.swd.init(0);
 317                 vsllink_swd_frequency(adapter_get_speed_khz() * 1000);
 318                 vsllink_swd_switch_seq(JTAG_TO_SWD);
 319
 320         } else {
 321                 /* malloc buffer size for tap */
 322                 tap_buffer_size = versaloon_interface.usb_setting.buf_size / 2 - 32;
 323                 vsllink_free_buffer();
 324                 tdi_buffer = malloc(tap_buffer_size);
 325                 tdo_buffer = malloc(tap_buffer_size);
 326                 tms_buffer = malloc(tap_buffer_size);
 327                 if ((!tdi_buffer) || (!tdo_buffer) || (!tms_buffer)) {
 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, adapter_get_speed_khz());
 334                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
 335                         GPIO_TRST, GPIO_SRST, GPIO_SRST);
 336         }
 337
 338         if (versaloon_interface.adaptors.peripheral_commit() != ERROR_OK)
 339                 return ERROR_FAIL;
 340
 341         vsllink_reset(0, 0);
 342         vsllink_tap_init();
 343         return ERROR_OK;
 344 }
 345
 346 /**************************************************************************
 347  * Queue command implementations */
 348
 349 static void vsllink_end_state(tap_state_t state)
 350 {
 351         if (tap_is_state_stable(state))
 352                 tap_set_end_state(state);
 353         else {
 354                 LOG_ERROR("BUG: %i is not a valid end state", state);
 355                 exit(-1);
 356         }
 357 }
 358
 359 /* Goes to the end state. */
 360 static void vsllink_state_move(void)
 361 {
 362         int i;
 363         uint8_t tms_scan = tap_get_tms_path(tap_get_state(),
 364                         tap_get_end_state());
 365         uint8_t tms_scan_bits = tap_get_tms_path_len(tap_get_state(),
 366                         tap_get_end_state());
 367
 368         for (i = 0; i < tms_scan_bits; i++)
 369                 vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 370
 371         tap_set_state(tap_get_end_state());
 372 }
 373
 374 static void vsllink_path_move(int num_states, tap_state_t *path)
 375 {
 376         for (int i = 0; i < num_states; i++) {
 377                 if (path[i] == tap_state_transition(tap_get_state(), false))
 378                         vsllink_tap_append_step(0, 0);
 379                 else if (path[i] == tap_state_transition(tap_get_state(), true))
 380                         vsllink_tap_append_step(1, 0);
 381                 else {
 382                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 383                                 tap_state_name(tap_get_state()),
 384                                 tap_state_name(path[i]));
 385                         exit(-1);
 386                 }
 387
 388                 tap_set_state(path[i]);
 389         }
 390
 391         tap_set_end_state(tap_get_state());
 392 }
 393
 394 static void vsllink_tms(int num_bits, const uint8_t *bits)
 395 {
 396         for (int i = 0; i < num_bits; i++)
 397                 vsllink_tap_append_step((bits[i / 8] >> (i % 8)) & 1, 0);
 398 }
 399
 400 static void vsllink_stableclocks(int num_cycles, int tms)
 401 {
 402         while (num_cycles > 0) {
 403                 vsllink_tap_append_step(tms, 0);
 404                 num_cycles--;
 405         }
 406 }
 407
 408 static void vsllink_runtest(int num_cycles)
 409 {
 410         tap_state_t saved_end_state = tap_get_end_state();
 411
 412         if (tap_get_state() != TAP_IDLE) {
 413                 /* enter IDLE state */
 414                 vsllink_end_state(TAP_IDLE);
 415                 vsllink_state_move();
 416         }
 417
 418         vsllink_stableclocks(num_cycles, 0);
 419
 420         /* post-process */
 421         /* set end_state */
 422         vsllink_end_state(saved_end_state);
 423         if (tap_get_end_state() != tap_get_end_state())
 424                 vsllink_state_move();
 425 }
 426
 427 static void vsllink_scan(bool ir_scan, enum scan_type type, uint8_t *buffer,
 428         int scan_size, struct scan_command *command)
 429 {
 430         tap_state_t saved_end_state;
 431
 432         saved_end_state = tap_get_end_state();
 433
 434         /* Move to appropriate scan state */
 435         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
 436
 437         if (tap_get_state() != tap_get_end_state())
 438                 vsllink_state_move();
 439         vsllink_end_state(saved_end_state);
 440
 441         /* Scan */
 442         vsllink_tap_append_scan(scan_size, buffer, command);
 443
 444         /* Goto Pause and record position to insert tms:0 */
 445         vsllink_tap_append_step(0, 0);
 446         vsllink_tms_offset = tap_length;
 447
 448         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
 449
 450         if (tap_get_state() != tap_get_end_state())
 451                 vsllink_state_move();
 452 }
 453
 454 static int vsllink_reset(int trst, int srst)
 455 {
 456         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
 457
 458         if (!srst)
 459                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, 0, GPIO_SRST, GPIO_SRST);
 460         else
 461                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, GPIO_SRST, 0, 0);
 462
 463         if (!swd_mode) {
 464                 if (!trst)
 465                         versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, GPIO_TRST);
 466                 else
 467                         versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, 0);
 468         }
 469
 470         return versaloon_interface.adaptors.peripheral_commit();
 471 }
 472
 473 COMMAND_HANDLER(vsllink_handle_usb_vid_command)
 474 {
 475         if (CMD_ARGC != 1)
 476                 return ERROR_COMMAND_SYNTAX_ERROR;
 477
 478         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0],
 479                 versaloon_interface.usb_setting.vid);
 480         return ERROR_OK;
 481 }
 482
 483 COMMAND_HANDLER(vsllink_handle_usb_pid_command)
 484 {
 485         if (CMD_ARGC != 1)
 486                 return ERROR_COMMAND_SYNTAX_ERROR;
 487         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0],
 488                 versaloon_interface.usb_setting.pid);
 489         return ERROR_OK;
 490 }
 491
 492 COMMAND_HANDLER(vsllink_handle_usb_bulkin_command)
 493 {
 494         if (CMD_ARGC != 1)
 495                 return ERROR_COMMAND_SYNTAX_ERROR;
 496
 497         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 498                 versaloon_interface.usb_setting.ep_in);
 499
 500         versaloon_interface.usb_setting.ep_in |= 0x80;
 501
 502         return ERROR_OK;
 503 }
 504
 505 COMMAND_HANDLER(vsllink_handle_usb_bulkout_command)
 506 {
 507         if (CMD_ARGC != 1)
 508                 return ERROR_COMMAND_SYNTAX_ERROR;
 509
 510         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 511                 versaloon_interface.usb_setting.ep_out);
 512
 513         versaloon_interface.usb_setting.ep_out &= ~0x80;
 514
 515         return ERROR_OK;
 516 }
 517
 518 COMMAND_HANDLER(vsllink_handle_usb_interface_command)
 519 {
 520         if (CMD_ARGC != 1)
 521                 return ERROR_COMMAND_SYNTAX_ERROR;
 522
 523         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 524                 versaloon_interface.usb_setting.interface);
 525         return ERROR_OK;
 526 }
 527
 528 /**************************************************************************
 529  * VSLLink tap functions */
 530
 531 static void vsllink_tap_init(void)
 532 {
 533         tap_length = 0;
 534         pending_scan_results_length = 0;
 535         vsllink_tms_offset = 0;
 536 }
 537
 538 static void vsllink_tap_ensure_pending(int scans)
 539 {
 540         int available_scans =
 541                 MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
 542
 543         if (scans > available_scans)
 544                 vsllink_tap_execute();
 545 }
 546
 547 static void vsllink_tap_append_step(int tms, int tdi)
 548 {
 549         int index_var = tap_length / 8;
 550
 551         int bit_index = tap_length % 8;
 552         uint8_t bit = 1 << bit_index;
 553
 554         if (tms)
 555                 tms_buffer[index_var] |= bit;
 556         else
 557                 tms_buffer[index_var] &= ~bit;
 558
 559         if (tdi)
 560                 tdi_buffer[index_var] |= bit;
 561         else
 562                 tdi_buffer[index_var] &= ~bit;
 563
 564         tap_length++;
 565
 566         if (tap_buffer_size * 8 <= tap_length)
 567                 vsllink_tap_execute();
 568 }
 569
 570 static void vsllink_tap_append_scan(int length, uint8_t *buffer,
 571         struct scan_command *command)
 572 {
 573         struct pending_scan_result *pending_scan_result;
 574         int len_tmp, len_all, i;
 575
 576         len_all = 0;
 577         while (len_all < length) {
 578                 vsllink_tap_ensure_pending(1);
 579                 pending_scan_result =
 580                         &pending_scan_results_buffer[
 581                                 pending_scan_results_length];
 582
 583                 if ((length - len_all) > (tap_buffer_size * 8 - tap_length)) {
 584                         /* Use all memory available
 585                            vsllink_tap_append_step will commit automatically */
 586                         len_tmp = tap_buffer_size * 8 - tap_length;
 587                         pending_scan_result->last = false;
 588                 } else {
 589                         len_tmp = length - len_all;
 590                         pending_scan_result->last = true;
 591                 }
 592                 pending_scan_result->src_offset = tap_length;
 593                 pending_scan_result->dest_offset = len_all;
 594                 pending_scan_result->length = len_tmp;
 595                 pending_scan_result->command = command;
 596                 pending_scan_result->buffer = buffer;
 597                 pending_scan_results_length++;
 598
 599                 for (i = 0; i < len_tmp; i++) {
 600                         vsllink_tap_append_step(((len_all + i) < length-1
 601                                                  ? 0 : 1),
 602                                 (buffer[(len_all + i)/8]
 603                                  >> ((len_all + i)%8)) & 1);
 604                 }
 605
 606                 len_all += len_tmp;
 607         }
 608 }
 609
 610 static int vsllink_jtag_execute(void)
 611 {
 612         int i;
 613         int result;
 614
 615         if (tap_length <= 0)
 616                 return ERROR_OK;
 617
 618         versaloon_interface.adaptors.jtag_raw.execute(0, tdi_buffer, tms_buffer,
 619                 tdo_buffer, tap_length);
 620
 621         result = versaloon_interface.adaptors.peripheral_commit();
 622
 623         if (result == ERROR_OK) {
 624                 for (i = 0; i < pending_scan_results_length; i++) {
 625                         struct pending_scan_result *pending_scan_result =
 626                                 &pending_scan_results_buffer[i];
 627                         uint8_t *buffer = pending_scan_result->buffer;
 628                         int length = pending_scan_result->length;
 629                         int src_first = pending_scan_result->src_offset;
 630                         int dest_first = pending_scan_result->dest_offset;
 631                         bool last = pending_scan_result->last;
 632
 633                         struct scan_command *command;
 634
 635                         command = pending_scan_result->command;
 636                         buf_set_buf(tdo_buffer, src_first, buffer, dest_first, length);
 637
 638                         LOG_DEBUG_IO(
 639                                 "JTAG scan read(%d bits, from src %d bits to dest %d bits):",
 640                                 length, src_first, dest_first);
 641                         if (LOG_LEVEL_IS(LOG_LVL_DEBUG_IO))
 642                                 vsllink_debug_buffer(buffer + dest_first / 8, DIV_ROUND_UP(length, 7));
 643
 644                         if (last) {
 645                                 if (jtag_read_buffer(buffer, command)
 646                                     != ERROR_OK) {
 647                                         vsllink_tap_init();
 648                                         return ERROR_JTAG_QUEUE_FAILED;
 649                                 }
 650
 651                                 free(pending_scan_result->buffer);
 652                         }
 653                 }
 654         } else {
 655                 LOG_ERROR("vsllink_jtag_execute failure");
 656                 return ERROR_JTAG_QUEUE_FAILED;
 657         }
 658
 659         vsllink_tap_init();
 660
 661         return ERROR_OK;
 662 }
 663
 664 static int vsllink_tap_execute(void)
 665 {
 666         if (swd_mode)
 667                 return ERROR_OK;
 668
 669         return vsllink_jtag_execute();
 670 }
 671
 672 static int vsllink_swd_init(void)
 673 {
 674         LOG_INFO("VSLLink SWD mode enabled");
 675         swd_mode = true;
 676
 677         return ERROR_OK;
 678 }
 679
 680 static int_least32_t vsllink_swd_frequency(int_least32_t hz)
 681 {
 682         const int_least32_t delay2hz[] = {
 683                 1850000, 235000, 130000, 102000, 85000, 72000
 684         };
 685
 686         if (hz > 0) {
 687                 uint16_t delay = UINT16_MAX;
 688
 689                 for (uint16_t i = 0; i < ARRAY_SIZE(delay2hz); i++) {
 690                         if (hz >= delay2hz[i]) {
 691                                 hz = delay2hz[i];
 692                                 delay = i;
 693                                 break;
 694                         }
 695                 }
 696
 697                 if (delay == UINT16_MAX)
 698                         delay = (500000 / hz) - 1;
 699
 700                 /* Calculate retry count after a WAIT response. This will give
 701                  * a retry timeout at about ~250 ms. 54 is the number of bits
 702                  * found in a transaction. */
 703                 uint16_t retry_count = 250 * hz / 1000 / 54;
 704
 705                 LOG_DEBUG("SWD delay: %d, retry count: %d", delay, retry_count);
 706
 707                 versaloon_interface.adaptors.swd.config(0, 2, retry_count, delay);
 708         }
 709
 710         return hz;
 711 }
 712
 713 static int vsllink_swd_switch_seq(enum swd_special_seq seq)
 714 {
 715         switch (seq) {
 716         case LINE_RESET:
 717                 LOG_DEBUG("SWD line reset");
 718                 versaloon_interface.adaptors.swd.seqout(0, swd_seq_line_reset,
 719                                 swd_seq_line_reset_len);
 720                 break;
 721         case JTAG_TO_SWD:
 722                 LOG_DEBUG("JTAG-to-SWD");
 723                 versaloon_interface.adaptors.swd.seqout(0, swd_seq_jtag_to_swd,
 724                                 swd_seq_jtag_to_swd_len);
 725                 break;
 726         case SWD_TO_JTAG:
 727                 LOG_DEBUG("SWD-to-JTAG");
 728                 versaloon_interface.adaptors.swd.seqout(0, swd_seq_swd_to_jtag,
 729                                 swd_seq_swd_to_jtag_len);
 730                 break;
 731         default:
 732                 LOG_ERROR("Sequence %d not supported", seq);
 733                 return ERROR_FAIL;
 734         }
 735
 736         return ERROR_OK;
 737 }
 738
 739 static void vsllink_swd_read_reg(uint8_t cmd, uint32_t *value, uint32_t ap_delay_clk)
 740 {
 741         versaloon_interface.adaptors.swd.transact(0, cmd, value, NULL);
 742 }
 743
 744 static void vsllink_swd_write_reg(uint8_t cmd, uint32_t value, uint32_t ap_delay_clk)
 745 {
 746         versaloon_interface.adaptors.swd.transact(0, cmd, &value, NULL);
 747 }
 748
 749 static int vsllink_swd_run_queue(void)
 750 {
 751         return versaloon_interface.adaptors.peripheral_commit();
 752 }
 753
 754 /****************************************************************************
 755  * VSLLink USB low-level functions */
 756
 757 static int vsllink_check_usb_strings(
 758         struct libusb_device_handle *usb_device_handle,
 759         struct libusb_device_descriptor *usb_desc)
 760 {
 761         char desc_string[256];
 762         int retval;
 763
 764         if (adapter_get_required_serial()) {
 765                 retval = libusb_get_string_descriptor_ascii(usb_device_handle,
 766                         usb_desc->iSerialNumber, (unsigned char *)desc_string,
 767                         sizeof(desc_string));
 768                 if (retval < 0)
 769                         return ERROR_FAIL;
 770
 771                 if (strncmp(desc_string, adapter_get_required_serial(),
 772                                 sizeof(desc_string)))
 773                         return ERROR_FAIL;
 774         }
 775
 776         retval = libusb_get_string_descriptor_ascii(usb_device_handle,
 777                 usb_desc->iProduct, (unsigned char *)desc_string,
 778                 sizeof(desc_string));
 779         if (retval < 0)
 780                 return ERROR_FAIL;
 781
 782         if (!strstr(desc_string, "Versaloon"))
 783                 return ERROR_FAIL;
 784
 785         return ERROR_OK;
 786 }
 787
 788 static int vsllink_usb_open(struct vsllink *vsllink)
 789 {
 790         ssize_t num_devices, i;
 791         struct libusb_device **usb_devices;
 792         struct libusb_device_descriptor usb_desc;
 793         struct libusb_device_handle *usb_device_handle;
 794         int retval;
 795
 796         num_devices = libusb_get_device_list(vsllink->libusb_ctx, &usb_devices);
 797
 798         if (num_devices <= 0)
 799                 return ERROR_FAIL;
 800
 801         for (i = 0; i < num_devices; i++) {
 802                 struct libusb_device *device = usb_devices[i];
 803
 804                 retval = libusb_get_device_descriptor(device, &usb_desc);
 805                 if (retval != 0)
 806                         continue;
 807
 808                 if (usb_desc.idVendor != versaloon_interface.usb_setting.vid ||
 809                         usb_desc.idProduct != versaloon_interface.usb_setting.pid)
 810                         continue;
 811
 812                 retval = libusb_open(device, &usb_device_handle);
 813                 if (retval != 0)
 814                         continue;
 815
 816                 retval = vsllink_check_usb_strings(usb_device_handle, &usb_desc);
 817                 if (retval == ERROR_OK)
 818                         break;
 819
 820                 libusb_close(usb_device_handle);
 821         }
 822
 823         libusb_free_device_list(usb_devices, 1);
 824
 825         if (i == num_devices)
 826                 return ERROR_FAIL;
 827
 828         retval = libusb_claim_interface(usb_device_handle,
 829                 versaloon_interface.usb_setting.interface);
 830         if (retval != 0) {
 831                 LOG_ERROR("unable to claim interface");
 832                 libusb_close(usb_device_handle);
 833                 return ERROR_FAIL;
 834         }
 835
 836         vsllink->usb_device_handle = usb_device_handle;
 837         return ERROR_OK;
 838 }
 839
 840 static void vsllink_usb_close(struct vsllink *vsllink)
 841 {
 842         libusb_release_interface(vsllink->usb_device_handle,
 843                 versaloon_interface.usb_setting.interface);
 844         libusb_close(vsllink->usb_device_handle);
 845 }
 846
 847 #define BYTES_PER_LINE  16
 848
 849 static void vsllink_debug_buffer(uint8_t *buffer, int length)
 850 {
 851         char line[81];
 852         char s[4];
 853         int i;
 854         int j;
 855
 856         for (i = 0; i < length; i += BYTES_PER_LINE) {
 857                 snprintf(line, 5, "%04x", i & 0xffff);
 858                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++) {
 859                         snprintf(s, 4, " %02x", buffer[j]);
 860                         strcat(line, s);
 861                 }
 862                 LOG_DEBUG_IO("%s", line);
 863         }
 864 }
 865
 866 static const struct command_registration vsllink_subcommand_handlers[] = {
 867         {
 868                 .name = "usb_vid",
 869                 .handler = &vsllink_handle_usb_vid_command,
 870                 .mode = COMMAND_CONFIG,
 871                 .help = "Set USB VID",
 872                 .usage = "<vid>",
 873         },
 874         {
 875                 .name = "usb_pid",
 876                 .handler = &vsllink_handle_usb_pid_command,
 877                 .mode = COMMAND_CONFIG,
 878                 .help = "Set USB PID",
 879                 .usage = "<pid>",
 880         },
 881         {
 882                 .name = "usb_bulkin",
 883                 .handler = &vsllink_handle_usb_bulkin_command,
 884                 .mode = COMMAND_CONFIG,
 885                 .help = "Set USB input endpoint",
 886                 .usage = "<ep_in>",
 887         },
 888         {
 889                 .name = "usb_bulkout",
 890                 .handler = &vsllink_handle_usb_bulkout_command,
 891                 .mode = COMMAND_CONFIG,
 892                 .help = "Set USB output endpoint",
 893                 .usage = "<ep_out>",
 894         },
 895         {
 896                 .name = "usb_interface",
 897                 .handler = &vsllink_handle_usb_interface_command,
 898                 .mode = COMMAND_CONFIG,
 899                 .help = "Set USB output interface",
 900                 .usage = "<interface>",
 901         },
 902         COMMAND_REGISTRATION_DONE
 903 };
 904
 905 static const struct command_registration vsllink_command_handlers[] = {
 906         {
 907                 .name = "vsllink",
 908                 .mode = COMMAND_ANY,
 909                 .help = "perform vsllink management",
 910                 .chain = vsllink_subcommand_handlers,
 911                 .usage = "",
 912         },
 913         COMMAND_REGISTRATION_DONE
 914 };
 915
 916 static const char * const vsllink_transports[] = {"jtag", "swd", NULL};
 917
 918 static const struct swd_driver vsllink_swd_driver = {
 919         .init = vsllink_swd_init,
 920         .switch_seq = vsllink_swd_switch_seq,
 921         .read_reg = vsllink_swd_read_reg,
 922         .write_reg = vsllink_swd_write_reg,
 923         .run = vsllink_swd_run_queue,
 924 };
 925
 926 static struct jtag_interface vsllink_interface = {
 927         .supported = DEBUG_CAP_TMS_SEQ,
 928         .execute_queue = vsllink_execute_queue,
 929 };
 930
 931 struct adapter_driver vsllink_adapter_driver = {
 932         .name = "vsllink",
 933         .transports = vsllink_transports,
 934         .commands = vsllink_command_handlers,
 935
 936         .init = vsllink_init,
 937         .quit = vsllink_quit,
 938         .reset = vsllink_reset,
 939         .speed = vsllink_speed,
 940         .khz = vsllink_khz,
 941         .speed_div = vsllink_speed_div,
 942
 943         .jtag_ops = &vsllink_interface,
 944         .swd_ops = &vsllink_swd_driver,
 945 };