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   1 /***************************************************************************
   2  *   Copyright (C) 2009-2010 by Simon Qian <SimonQian@SimonQian.com>       *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  16  ***************************************************************************/
  17
  18 /* Versaloon is a programming tool for multiple MCUs.
  19  * It's distributed under GPLv3.
  20  * You can find it at http://www.Versaloon.com/.
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <jtag/adapter.h>
  28 #include <jtag/interface.h>
  29 #include <jtag/commands.h>
  30 #include <jtag/swd.h>
  31 #include <libusb.h>
  32
  33 #include "versaloon/versaloon_include.h"
  34 #include "versaloon/versaloon.h"
  35
  36 static int vsllink_tms_offset;
  37
  38 struct pending_scan_result {
  39         int src_offset;
  40         int dest_offset;
  41         int length;     /* Number of bits to read */
  42         struct scan_command *command;   /* Corresponding scan command */
  43         uint8_t *ack;
  44         uint8_t *buffer;
  45         bool last;      /* indicate the last scan pending */
  46 };
  47
  48 #define MAX_PENDING_SCAN_RESULTS 256
  49
  50 static int pending_scan_results_length;
  51 static struct pending_scan_result
  52         pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
  53
  54 /* Queue command functions */
  55 static void vsllink_end_state(tap_state_t state);
  56 static void vsllink_state_move(void);
  57 static void vsllink_path_move(int num_states, tap_state_t *path);
  58 static void vsllink_tms(int num_bits, const uint8_t *bits);
  59 static void vsllink_runtest(int num_cycles);
  60 static void vsllink_stableclocks(int num_cycles, int tms);
  61 static void vsllink_scan(bool ir_scan, enum scan_type type,
  62                 uint8_t *buffer, int scan_size, struct scan_command *command);
  63 static int vsllink_reset(int trst, int srst);
  64
  65 /* VSLLink tap buffer functions */
  66 static void vsllink_tap_append_step(int tms, int tdi);
  67 static void vsllink_tap_init(void);
  68 static int  vsllink_tap_execute(void);
  69 static void vsllink_tap_ensure_pending(int scans);
  70 static void vsllink_tap_append_scan(int length, uint8_t *buffer,
  71                 struct scan_command *command);
  72
  73 /* VSLLink SWD functions */
  74 static int_least32_t vsllink_swd_frequency(int_least32_t hz);
  75 static int vsllink_swd_switch_seq(enum swd_special_seq seq);
  76
  77 /* VSLLink lowlevel functions */
  78 struct vsllink {
  79         struct libusb_context *libusb_ctx;
  80         struct libusb_device_handle *usb_device_handle;
  81 };
  82
  83 static int vsllink_usb_open(struct vsllink *vsllink);
  84 static void vsllink_usb_close(struct vsllink *vsllink);
  85
  86 static void vsllink_debug_buffer(uint8_t *buffer, int length);
  87
  88 static int tap_length;
  89 static int tap_buffer_size;
  90 static uint8_t *tms_buffer;
  91 static uint8_t *tdi_buffer;
  92 static uint8_t *tdo_buffer;
  93
  94 static bool swd_mode;
  95
  96 static struct vsllink *vsllink_handle;
  97
  98 static int vsllink_execute_queue(void)
  99 {
 100         struct jtag_command *cmd = jtag_command_queue;
 101         int scan_size;
 102         enum scan_type type;
 103         uint8_t *buffer;
 104
 105         LOG_DEBUG_IO("-------------------------------------"
 106                 " vsllink "
 107                 "-------------------------------------");
 108
 109         while (cmd) {
 110                 switch (cmd->type) {
 111                         case JTAG_RUNTEST:
 112                                 LOG_DEBUG_IO("runtest %i cycles, end in %s",
 113                                                 cmd->cmd.runtest->num_cycles,
 114                                                 tap_state_name(cmd->cmd.runtest->end_state));
 115
 116                                 vsllink_end_state(cmd->cmd.runtest->end_state);
 117                                 vsllink_runtest(cmd->cmd.runtest->num_cycles);
 118                                 break;
 119
 120                         case JTAG_TLR_RESET:
 121                                 LOG_DEBUG_IO("statemove end in %s",
 122                                                 tap_state_name(cmd->cmd.statemove->end_state));
 123
 124                                 vsllink_end_state(cmd->cmd.statemove->end_state);
 125                                 vsllink_state_move();
 126                                 break;
 127
 128                         case JTAG_PATHMOVE:
 129                                 LOG_DEBUG_IO("pathmove: %i states, end in %s",
 130                                                 cmd->cmd.pathmove->num_states,
 131                                                 tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
 132
 133                                 vsllink_path_move(cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path);
 134                                 break;
 135
 136                         case JTAG_SCAN:
 137                                 LOG_DEBUG_IO("JTAG Scan...");
 138
 139                                 vsllink_end_state(cmd->cmd.scan->end_state);
 140
 141                                 scan_size = jtag_build_buffer(
 142                                                 cmd->cmd.scan, &buffer);
 143
 144                                 if (cmd->cmd.scan->ir_scan)
 145                                         LOG_DEBUG_IO(
 146                                                         "JTAG Scan write IR(%d bits), "
 147                                                         "end in %s:",
 148                                                         scan_size,
 149                                                         tap_state_name(cmd->cmd.scan->end_state));
 150
 151                                 else
 152                                         LOG_DEBUG_IO(
 153                                                         "JTAG Scan write DR(%d bits), "
 154                                                         "end in %s:",
 155                                                         scan_size,
 156                                                         tap_state_name(cmd->cmd.scan->end_state));
 157
 158                                 if (LOG_LEVEL_IS(LOG_LVL_DEBUG_IO))
 159                                         vsllink_debug_buffer(buffer, DIV_ROUND_UP(scan_size, 8));
 160
 161                                 type = jtag_scan_type(cmd->cmd.scan);
 162
 163                                 vsllink_scan(cmd->cmd.scan->ir_scan,
 164                                                 type, buffer, scan_size,
 165                                                 cmd->cmd.scan);
 166                                 break;
 167
 168                         case JTAG_SLEEP:
 169                                 LOG_DEBUG_IO("sleep %" PRIu32, cmd->cmd.sleep->us);
 170                                 vsllink_tap_execute();
 171                                 jtag_sleep(cmd->cmd.sleep->us);
 172                                 break;
 173
 174                         case JTAG_STABLECLOCKS:
 175                                 LOG_DEBUG_IO("add %d clocks",
 176                                                 cmd->cmd.stableclocks->num_cycles);
 177
 178                                 switch (tap_get_state()) {
 179                                 case TAP_RESET:
 180                                         /* tms must be '1' to stay
 181                                          * n TAP_RESET mode
 182                                          */
 183                                         scan_size = 1;
 184                                         break;
 185                                 case TAP_DRSHIFT:
 186                                 case TAP_IDLE:
 187                                 case TAP_DRPAUSE:
 188                                 case TAP_IRSHIFT:
 189                                 case TAP_IRPAUSE:
 190                                         /* else, tms should be '0' */
 191                                         scan_size = 0;
 192                                         break;
 193                                 /* above stable states are OK */
 194                                 default:
 195                                         LOG_ERROR("jtag_add_clocks() "
 196                                                         "in non-stable state \"%s\"",
 197                                                         tap_state_name(tap_get_state())
 198                                         );
 199                                         exit(-1);
 200                                 }
 201                                 vsllink_stableclocks(cmd->cmd.stableclocks->num_cycles, scan_size);
 202                                 break;
 203
 204                                 case JTAG_TMS:
 205                                         LOG_DEBUG_IO("add %d jtag tms",
 206                                                         cmd->cmd.tms->num_bits);
 207
 208                                         vsllink_tms(cmd->cmd.tms->num_bits, cmd->cmd.tms->bits);
 209                                         break;
 210
 211                                 default:
 212                                         LOG_ERROR("BUG: unknown JTAG command type "
 213                                                         "encountered: %d", cmd->type);
 214                                         exit(-1);
 215                 }
 216                 cmd = cmd->next;
 217         }
 218
 219         return vsllink_tap_execute();
 220 }
 221
 222 static int vsllink_speed(int speed)
 223 {
 224         if (swd_mode) {
 225                 vsllink_swd_frequency(speed * 1000);
 226                 return ERROR_OK;
 227         }
 228
 229         versaloon_interface.adaptors.jtag_raw.config(0, (uint16_t)speed);
 230         return versaloon_interface.adaptors.peripheral_commit();
 231 }
 232
 233 static int vsllink_khz(int khz, int *jtag_speed)
 234 {
 235         *jtag_speed = khz;
 236
 237         return ERROR_OK;
 238 }
 239
 240 static int vsllink_speed_div(int jtag_speed, int *khz)
 241 {
 242         *khz = jtag_speed;
 243
 244         return ERROR_OK;
 245 }
 246
 247 static void vsllink_free_buffer(void)
 248 {
 249         free(tdi_buffer);
 250         tdi_buffer = NULL;
 251
 252         free(tdo_buffer);
 253         tdo_buffer = NULL;
 254
 255         free(tms_buffer);
 256         tms_buffer = NULL;
 257 }
 258
 259 static int vsllink_quit(void)
 260 {
 261         versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
 262                 0, 0, GPIO_SRST | GPIO_TRST);
 263         versaloon_interface.adaptors.gpio.fini(0);
 264
 265         if (swd_mode)
 266                 versaloon_interface.adaptors.swd.fini(0);
 267         else
 268                 versaloon_interface.adaptors.jtag_raw.fini(0);
 269
 270         versaloon_interface.adaptors.peripheral_commit();
 271         versaloon_interface.fini();
 272
 273         vsllink_free_buffer();
 274         vsllink_usb_close(vsllink_handle);
 275
 276         free(vsllink_handle);
 277
 278         return ERROR_OK;
 279 }
 280
 281 static int vsllink_interface_init(void)
 282 {
 283         vsllink_handle = malloc(sizeof(struct vsllink));
 284         if (!vsllink_handle) {
 285                 LOG_ERROR("unable to allocate memory");
 286                 return ERROR_FAIL;
 287         }
 288
 289         libusb_init(&vsllink_handle->libusb_ctx);
 290
 291         if (vsllink_usb_open(vsllink_handle) != ERROR_OK) {
 292                 LOG_ERROR("Can't find USB JTAG Interface!"
 293                         "Please check connection and permissions.");
 294                 return ERROR_JTAG_INIT_FAILED;
 295         }
 296         LOG_DEBUG("vsllink found on %04X:%04X",
 297                 versaloon_interface.usb_setting.vid,
 298                 versaloon_interface.usb_setting.pid);
 299         versaloon_usb_device_handle = vsllink_handle->usb_device_handle;
 300
 301         if (versaloon_interface.init() != ERROR_OK)
 302                 return ERROR_FAIL;
 303         if (versaloon_interface.usb_setting.buf_size < 32) {
 304                 versaloon_interface.fini();
 305                 return ERROR_FAIL;
 306         }
 307
 308         return ERROR_OK;
 309 }
 310
 311 static int vsllink_init(void)
 312 {
 313         int retval = vsllink_interface_init();
 314         if (retval != ERROR_OK)
 315                 return retval;
 316
 317         versaloon_interface.adaptors.gpio.init(0);
 318         versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, 0, GPIO_SRST,
 319                 GPIO_SRST);
 320         versaloon_interface.adaptors.delay.delayms(100);
 321         versaloon_interface.adaptors.peripheral_commit();
 322
 323         if (swd_mode) {
 324                 versaloon_interface.adaptors.gpio.config(0, GPIO_TRST, 0,
 325                         GPIO_TRST, GPIO_TRST);
 326                 versaloon_interface.adaptors.swd.init(0);
 327                 vsllink_swd_frequency(adapter_get_speed_khz() * 1000);
 328                 vsllink_swd_switch_seq(JTAG_TO_SWD);
 329
 330         } else {
 331                 /* malloc buffer size for tap */
 332                 tap_buffer_size = versaloon_interface.usb_setting.buf_size / 2 - 32;
 333                 vsllink_free_buffer();
 334                 tdi_buffer = malloc(tap_buffer_size);
 335                 tdo_buffer = malloc(tap_buffer_size);
 336                 tms_buffer = malloc(tap_buffer_size);
 337                 if ((!tdi_buffer) || (!tdo_buffer) || (!tms_buffer)) {
 338                         vsllink_quit();
 339                         return ERROR_FAIL;
 340                 }
 341
 342                 versaloon_interface.adaptors.jtag_raw.init(0);
 343                 versaloon_interface.adaptors.jtag_raw.config(0, adapter_get_speed_khz());
 344                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
 345                         GPIO_TRST, GPIO_SRST, GPIO_SRST);
 346         }
 347
 348         if (versaloon_interface.adaptors.peripheral_commit() != ERROR_OK)
 349                 return ERROR_FAIL;
 350
 351         vsllink_reset(0, 0);
 352         vsllink_tap_init();
 353         return ERROR_OK;
 354 }
 355
 356 /**************************************************************************
 357  * Queue command implementations */
 358
 359 static void vsllink_end_state(tap_state_t state)
 360 {
 361         if (tap_is_state_stable(state))
 362                 tap_set_end_state(state);
 363         else {
 364                 LOG_ERROR("BUG: %i is not a valid end state", state);
 365                 exit(-1);
 366         }
 367 }
 368
 369 /* Goes to the end state. */
 370 static void vsllink_state_move(void)
 371 {
 372         int i;
 373         uint8_t tms_scan = tap_get_tms_path(tap_get_state(),
 374                         tap_get_end_state());
 375         uint8_t tms_scan_bits = tap_get_tms_path_len(tap_get_state(),
 376                         tap_get_end_state());
 377
 378         for (i = 0; i < tms_scan_bits; i++)
 379                 vsllink_tap_append_step((tms_scan >> i) & 1, 0);
 380
 381         tap_set_state(tap_get_end_state());
 382 }
 383
 384 static void vsllink_path_move(int num_states, tap_state_t *path)
 385 {
 386         for (int i = 0; i < num_states; i++) {
 387                 if (path[i] == tap_state_transition(tap_get_state(), false))
 388                         vsllink_tap_append_step(0, 0);
 389                 else if (path[i] == tap_state_transition(tap_get_state(), true))
 390                         vsllink_tap_append_step(1, 0);
 391                 else {
 392                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 393                                 tap_state_name(tap_get_state()),
 394                                 tap_state_name(path[i]));
 395                         exit(-1);
 396                 }
 397
 398                 tap_set_state(path[i]);
 399         }
 400
 401         tap_set_end_state(tap_get_state());
 402 }
 403
 404 static void vsllink_tms(int num_bits, const uint8_t *bits)
 405 {
 406         for (int i = 0; i < num_bits; i++)
 407                 vsllink_tap_append_step((bits[i / 8] >> (i % 8)) & 1, 0);
 408 }
 409
 410 static void vsllink_stableclocks(int num_cycles, int tms)
 411 {
 412         while (num_cycles > 0) {
 413                 vsllink_tap_append_step(tms, 0);
 414                 num_cycles--;
 415         }
 416 }
 417
 418 static void vsllink_runtest(int num_cycles)
 419 {
 420         tap_state_t saved_end_state = tap_get_end_state();
 421
 422         if (tap_get_state() != TAP_IDLE) {
 423                 /* enter IDLE state */
 424                 vsllink_end_state(TAP_IDLE);
 425                 vsllink_state_move();
 426         }
 427
 428         vsllink_stableclocks(num_cycles, 0);
 429
 430         /* post-process */
 431         /* set end_state */
 432         vsllink_end_state(saved_end_state);
 433         if (tap_get_end_state() != tap_get_end_state())
 434                 vsllink_state_move();
 435 }
 436
 437 static void vsllink_scan(bool ir_scan, enum scan_type type, uint8_t *buffer,
 438         int scan_size, struct scan_command *command)
 439 {
 440         tap_state_t saved_end_state;
 441
 442         saved_end_state = tap_get_end_state();
 443
 444         /* Move to appropriate scan state */
 445         vsllink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
 446
 447         if (tap_get_state() != tap_get_end_state())
 448                 vsllink_state_move();
 449         vsllink_end_state(saved_end_state);
 450
 451         /* Scan */
 452         vsllink_tap_append_scan(scan_size, buffer, command);
 453
 454         /* Goto Pause and record position to insert tms:0 */
 455         vsllink_tap_append_step(0, 0);
 456         vsllink_tms_offset = tap_length;
 457
 458         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
 459
 460         if (tap_get_state() != tap_get_end_state())
 461                 vsllink_state_move();
 462 }
 463
 464 static int vsllink_reset(int trst, int srst)
 465 {
 466         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
 467
 468         if (!srst)
 469                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, 0, GPIO_SRST, GPIO_SRST);
 470         else
 471                 versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, GPIO_SRST, 0, 0);
 472
 473         if (!swd_mode) {
 474                 if (!trst)
 475                         versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, GPIO_TRST);
 476                 else
 477                         versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, 0);
 478         }
 479
 480         return versaloon_interface.adaptors.peripheral_commit();
 481 }
 482
 483 COMMAND_HANDLER(vsllink_handle_usb_vid_command)
 484 {
 485         if (CMD_ARGC != 1)
 486                 return ERROR_COMMAND_SYNTAX_ERROR;
 487
 488         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0],
 489                 versaloon_interface.usb_setting.vid);
 490         return ERROR_OK;
 491 }
 492
 493 COMMAND_HANDLER(vsllink_handle_usb_pid_command)
 494 {
 495         if (CMD_ARGC != 1)
 496                 return ERROR_COMMAND_SYNTAX_ERROR;
 497         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0],
 498                 versaloon_interface.usb_setting.pid);
 499         return ERROR_OK;
 500 }
 501
 502 COMMAND_HANDLER(vsllink_handle_usb_bulkin_command)
 503 {
 504         if (CMD_ARGC != 1)
 505                 return ERROR_COMMAND_SYNTAX_ERROR;
 506
 507         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 508                 versaloon_interface.usb_setting.ep_in);
 509
 510         versaloon_interface.usb_setting.ep_in |= 0x80;
 511
 512         return ERROR_OK;
 513 }
 514
 515 COMMAND_HANDLER(vsllink_handle_usb_bulkout_command)
 516 {
 517         if (CMD_ARGC != 1)
 518                 return ERROR_COMMAND_SYNTAX_ERROR;
 519
 520         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 521                 versaloon_interface.usb_setting.ep_out);
 522
 523         versaloon_interface.usb_setting.ep_out &= ~0x80;
 524
 525         return ERROR_OK;
 526 }
 527
 528 COMMAND_HANDLER(vsllink_handle_usb_interface_command)
 529 {
 530         if (CMD_ARGC != 1)
 531                 return ERROR_COMMAND_SYNTAX_ERROR;
 532
 533         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0],
 534                 versaloon_interface.usb_setting.interface);
 535         return ERROR_OK;
 536 }
 537
 538 /**************************************************************************
 539  * VSLLink tap functions */
 540
 541 static void vsllink_tap_init(void)
 542 {
 543         tap_length = 0;
 544         pending_scan_results_length = 0;
 545         vsllink_tms_offset = 0;
 546 }
 547
 548 static void vsllink_tap_ensure_pending(int scans)
 549 {
 550         int available_scans =
 551                 MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
 552
 553         if (scans > available_scans)
 554                 vsllink_tap_execute();
 555 }
 556
 557 static void vsllink_tap_append_step(int tms, int tdi)
 558 {
 559         int index_var = tap_length / 8;
 560
 561         int bit_index = tap_length % 8;
 562         uint8_t bit = 1 << bit_index;
 563
 564         if (tms)
 565                 tms_buffer[index_var] |= bit;
 566         else
 567                 tms_buffer[index_var] &= ~bit;
 568
 569         if (tdi)
 570                 tdi_buffer[index_var] |= bit;
 571         else
 572                 tdi_buffer[index_var] &= ~bit;
 573
 574         tap_length++;
 575
 576         if (tap_buffer_size * 8 <= tap_length)
 577                 vsllink_tap_execute();
 578 }
 579
 580 static void vsllink_tap_append_scan(int length, uint8_t *buffer,
 581         struct scan_command *command)
 582 {
 583         struct pending_scan_result *pending_scan_result;
 584         int len_tmp, len_all, i;
 585
 586         len_all = 0;
 587         while (len_all < length) {
 588                 vsllink_tap_ensure_pending(1);
 589                 pending_scan_result =
 590                         &pending_scan_results_buffer[
 591                                 pending_scan_results_length];
 592
 593                 if ((length - len_all) > (tap_buffer_size * 8 - tap_length)) {
 594                         /* Use all memory available
 595                            vsllink_tap_append_step will commit automatically */
 596                         len_tmp = tap_buffer_size * 8 - tap_length;
 597                         pending_scan_result->last = false;
 598                 } else {
 599                         len_tmp = length - len_all;
 600                         pending_scan_result->last = true;
 601                 }
 602                 pending_scan_result->src_offset = tap_length;
 603                 pending_scan_result->dest_offset = len_all;
 604                 pending_scan_result->length = len_tmp;
 605                 pending_scan_result->command = command;
 606                 pending_scan_result->buffer = buffer;
 607                 pending_scan_results_length++;
 608
 609                 for (i = 0; i < len_tmp; i++) {
 610                         vsllink_tap_append_step(((len_all + i) < length-1
 611                                                  ? 0 : 1),
 612                                 (buffer[(len_all + i)/8]
 613                                  >> ((len_all + i)%8)) & 1);
 614                 }
 615
 616                 len_all += len_tmp;
 617         }
 618 }
 619
 620 static int vsllink_jtag_execute(void)
 621 {
 622         int i;
 623         int result;
 624
 625         if (tap_length <= 0)
 626                 return ERROR_OK;
 627
 628         versaloon_interface.adaptors.jtag_raw.execute(0, tdi_buffer, tms_buffer,
 629                 tdo_buffer, tap_length);
 630
 631         result = versaloon_interface.adaptors.peripheral_commit();
 632
 633         if (result == ERROR_OK) {
 634                 for (i = 0; i < pending_scan_results_length; i++) {
 635                         struct pending_scan_result *pending_scan_result =
 636                                 &pending_scan_results_buffer[i];
 637                         uint8_t *buffer = pending_scan_result->buffer;
 638                         int length = pending_scan_result->length;
 639                         int src_first = pending_scan_result->src_offset;
 640                         int dest_first = pending_scan_result->dest_offset;
 641                         bool last = pending_scan_result->last;
 642
 643                         struct scan_command *command;
 644
 645                         command = pending_scan_result->command;
 646                         buf_set_buf(tdo_buffer, src_first, buffer, dest_first, length);
 647
 648                         LOG_DEBUG_IO(
 649                                 "JTAG scan read(%d bits, from src %d bits to dest %d bits):",
 650                                 length, src_first, dest_first);
 651                         if (LOG_LEVEL_IS(LOG_LVL_DEBUG_IO))
 652                                 vsllink_debug_buffer(buffer + dest_first / 8, DIV_ROUND_UP(length, 7));
 653
 654                         if (last) {
 655                                 if (jtag_read_buffer(buffer, command)
 656                                     != ERROR_OK) {
 657                                         vsllink_tap_init();
 658                                         return ERROR_JTAG_QUEUE_FAILED;
 659                                 }
 660
 661                                 free(pending_scan_result->buffer);
 662                         }
 663                 }
 664         } else {
 665                 LOG_ERROR("vsllink_jtag_execute failure");
 666                 return ERROR_JTAG_QUEUE_FAILED;
 667         }
 668
 669         vsllink_tap_init();
 670
 671         return ERROR_OK;
 672 }
 673
 674 static int vsllink_tap_execute(void)
 675 {
 676         if (swd_mode)
 677                 return ERROR_OK;
 678
 679         return vsllink_jtag_execute();
 680 }
 681
 682 static int vsllink_swd_init(void)
 683 {
 684         LOG_INFO("VSLLink SWD mode enabled");
 685         swd_mode = true;
 686
 687         return ERROR_OK;
 688 }
 689
 690 static int_least32_t vsllink_swd_frequency(int_least32_t hz)
 691 {
 692         const int_least32_t delay2hz[] = {
 693                 1850000, 235000, 130000, 102000, 85000, 72000
 694         };
 695
 696         if (hz > 0) {
 697                 uint16_t delay = UINT16_MAX;
 698
 699                 for (uint16_t i = 0; i < ARRAY_SIZE(delay2hz); i++) {
 700                         if (hz >= delay2hz[i]) {
 701                                 hz = delay2hz[i];
 702                                 delay = i;
 703                                 break;
 704                         }
 705                 }
 706
 707                 if (delay == UINT16_MAX)
 708                         delay = (500000 / hz) - 1;
 709
 710                 /* Calculate retry count after a WAIT response. This will give
 711                  * a retry timeout at about ~250 ms. 54 is the number of bits
 712                  * found in a transaction. */
 713                 uint16_t retry_count = 250 * hz / 1000 / 54;
 714
 715                 LOG_DEBUG("SWD delay: %d, retry count: %d", delay, retry_count);
 716
 717                 versaloon_interface.adaptors.swd.config(0, 2, retry_count, delay);
 718         }
 719
 720         return hz;
 721 }
 722
 723 static int vsllink_swd_switch_seq(enum swd_special_seq seq)
 724 {
 725         switch (seq) {
 726         case LINE_RESET:
 727                 LOG_DEBUG("SWD line reset");
 728                 versaloon_interface.adaptors.swd.seqout(0, swd_seq_line_reset,
 729                                 swd_seq_line_reset_len);
 730                 break;
 731         case JTAG_TO_SWD:
 732                 LOG_DEBUG("JTAG-to-SWD");
 733                 versaloon_interface.adaptors.swd.seqout(0, swd_seq_jtag_to_swd,
 734                                 swd_seq_jtag_to_swd_len);
 735                 break;
 736         case SWD_TO_JTAG:
 737                 LOG_DEBUG("SWD-to-JTAG");
 738                 versaloon_interface.adaptors.swd.seqout(0, swd_seq_swd_to_jtag,
 739                                 swd_seq_swd_to_jtag_len);
 740                 break;
 741         default:
 742                 LOG_ERROR("Sequence %d not supported", seq);
 743                 return ERROR_FAIL;
 744         }
 745
 746         return ERROR_OK;
 747 }
 748
 749 static void vsllink_swd_read_reg(uint8_t cmd, uint32_t *value, uint32_t ap_delay_clk)
 750 {
 751         versaloon_interface.adaptors.swd.transact(0, cmd, value, NULL);
 752 }
 753
 754 static void vsllink_swd_write_reg(uint8_t cmd, uint32_t value, uint32_t ap_delay_clk)
 755 {
 756         versaloon_interface.adaptors.swd.transact(0, cmd, &value, NULL);
 757 }
 758
 759 static int vsllink_swd_run_queue(void)
 760 {
 761         return versaloon_interface.adaptors.peripheral_commit();
 762 }
 763
 764 /****************************************************************************
 765  * VSLLink USB low-level functions */
 766
 767 static int vsllink_check_usb_strings(
 768         struct libusb_device_handle *usb_device_handle,
 769         struct libusb_device_descriptor *usb_desc)
 770 {
 771         char desc_string[256];
 772         int retval;
 773
 774         if (adapter_get_required_serial()) {
 775                 retval = libusb_get_string_descriptor_ascii(usb_device_handle,
 776                         usb_desc->iSerialNumber, (unsigned char *)desc_string,
 777                         sizeof(desc_string));
 778                 if (retval < 0)
 779                         return ERROR_FAIL;
 780
 781                 if (strncmp(desc_string, adapter_get_required_serial(),
 782                                 sizeof(desc_string)))
 783                         return ERROR_FAIL;
 784         }
 785
 786         retval = libusb_get_string_descriptor_ascii(usb_device_handle,
 787                 usb_desc->iProduct, (unsigned char *)desc_string,
 788                 sizeof(desc_string));
 789         if (retval < 0)
 790                 return ERROR_FAIL;
 791
 792         if (!strstr(desc_string, "Versaloon"))
 793                 return ERROR_FAIL;
 794
 795         return ERROR_OK;
 796 }
 797
 798 static int vsllink_usb_open(struct vsllink *vsllink)
 799 {
 800         ssize_t num_devices, i;
 801         struct libusb_device **usb_devices;
 802         struct libusb_device_descriptor usb_desc;
 803         struct libusb_device_handle *usb_device_handle;
 804         int retval;
 805
 806         num_devices = libusb_get_device_list(vsllink->libusb_ctx, &usb_devices);
 807
 808         if (num_devices <= 0)
 809                 return ERROR_FAIL;
 810
 811         for (i = 0; i < num_devices; i++) {
 812                 struct libusb_device *device = usb_devices[i];
 813
 814                 retval = libusb_get_device_descriptor(device, &usb_desc);
 815                 if (retval != 0)
 816                         continue;
 817
 818                 if (usb_desc.idVendor != versaloon_interface.usb_setting.vid ||
 819                         usb_desc.idProduct != versaloon_interface.usb_setting.pid)
 820                         continue;
 821
 822                 retval = libusb_open(device, &usb_device_handle);
 823                 if (retval != 0)
 824                         continue;
 825
 826                 retval = vsllink_check_usb_strings(usb_device_handle, &usb_desc);
 827                 if (retval == ERROR_OK)
 828                         break;
 829
 830                 libusb_close(usb_device_handle);
 831         }
 832
 833         libusb_free_device_list(usb_devices, 1);
 834
 835         if (i == num_devices)
 836                 return ERROR_FAIL;
 837
 838         retval = libusb_claim_interface(usb_device_handle,
 839                 versaloon_interface.usb_setting.interface);
 840         if (retval != 0) {
 841                 LOG_ERROR("unable to claim interface");
 842                 libusb_close(usb_device_handle);
 843                 return ERROR_FAIL;
 844         }
 845
 846         vsllink->usb_device_handle = usb_device_handle;
 847         return ERROR_OK;
 848 }
 849
 850 static void vsllink_usb_close(struct vsllink *vsllink)
 851 {
 852         libusb_release_interface(vsllink->usb_device_handle,
 853                 versaloon_interface.usb_setting.interface);
 854         libusb_close(vsllink->usb_device_handle);
 855 }
 856
 857 #define BYTES_PER_LINE  16
 858
 859 static void vsllink_debug_buffer(uint8_t *buffer, int length)
 860 {
 861         char line[81];
 862         char s[4];
 863         int i;
 864         int j;
 865
 866         for (i = 0; i < length; i += BYTES_PER_LINE) {
 867                 snprintf(line, 5, "%04x", i & 0xffff);
 868                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++) {
 869                         snprintf(s, 4, " %02x", buffer[j]);
 870                         strcat(line, s);
 871                 }
 872                 LOG_DEBUG_IO("%s", line);
 873         }
 874 }
 875
 876 static const struct command_registration vsllink_subcommand_handlers[] = {
 877         {
 878                 .name = "usb_vid",
 879                 .handler = &vsllink_handle_usb_vid_command,
 880                 .mode = COMMAND_CONFIG,
 881                 .help = "Set USB VID",
 882                 .usage = "<vid>",
 883         },
 884         {
 885                 .name = "usb_pid",
 886                 .handler = &vsllink_handle_usb_pid_command,
 887                 .mode = COMMAND_CONFIG,
 888                 .help = "Set USB PID",
 889                 .usage = "<pid>",
 890         },
 891         {
 892                 .name = "usb_bulkin",
 893                 .handler = &vsllink_handle_usb_bulkin_command,
 894                 .mode = COMMAND_CONFIG,
 895                 .help = "Set USB input endpoint",
 896                 .usage = "<ep_in>",
 897         },
 898         {
 899                 .name = "usb_bulkout",
 900                 .handler = &vsllink_handle_usb_bulkout_command,
 901                 .mode = COMMAND_CONFIG,
 902                 .help = "Set USB output endpoint",
 903                 .usage = "<ep_out>",
 904         },
 905         {
 906                 .name = "usb_interface",
 907                 .handler = &vsllink_handle_usb_interface_command,
 908                 .mode = COMMAND_CONFIG,
 909                 .help = "Set USB output interface",
 910                 .usage = "<interface>",
 911         },
 912         COMMAND_REGISTRATION_DONE
 913 };
 914
 915 static const struct command_registration vsllink_command_handlers[] = {
 916         {
 917                 .name = "vsllink",
 918                 .mode = COMMAND_ANY,
 919                 .help = "perform vsllink management",
 920                 .chain = vsllink_subcommand_handlers,
 921                 .usage = "",
 922         },
 923         COMMAND_REGISTRATION_DONE
 924 };
 925
 926 static const char * const vsllink_transports[] = {"jtag", "swd", NULL};
 927
 928 static const struct swd_driver vsllink_swd_driver = {
 929         .init = vsllink_swd_init,
 930         .switch_seq = vsllink_swd_switch_seq,
 931         .read_reg = vsllink_swd_read_reg,
 932         .write_reg = vsllink_swd_write_reg,
 933         .run = vsllink_swd_run_queue,
 934 };
 935
 936 static struct jtag_interface vsllink_interface = {
 937         .supported = DEBUG_CAP_TMS_SEQ,
 938         .execute_queue = vsllink_execute_queue,
 939 };
 940
 941 struct adapter_driver vsllink_adapter_driver = {
 942         .name = "vsllink",
 943         .transports = vsllink_transports,
 944         .commands = vsllink_command_handlers,
 945
 946         .init = vsllink_init,
 947         .quit = vsllink_quit,
 948         .reset = vsllink_reset,
 949         .speed = vsllink_speed,
 950         .khz = vsllink_khz,
 951         .speed_div = vsllink_speed_div,
 952
 953         .jtag_ops = &vsllink_interface,
 954         .swd_ops = &vsllink_swd_driver,
 955 };