src/jtag/drivers/ti_icdi_usb.c

   1 /***************************************************************************
   2  *                                                                         *
   3  *   Copyright (C) 2012 by Spencer Oliver                                  *
   4  *   spen@spen-soft.co.uk                                                  *
   5  *                                                                         *
   6  *   This program is free software; you can redistribute it and/or modify  *
   7  *   it under the terms of the GNU General Public License as published by  *
   8  *   the Free Software Foundation; either version 2 of the License, or     *
   9  *   (at your option) any later version.                                   *
  10  *                                                                         *
  11  *   This program is distributed in the hope that it will be useful,       *
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14  *   GNU General Public License for more details.                          *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  18  ***************************************************************************/
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 /* project specific includes */
  25 #include <helper/binarybuffer.h>
  26 #include <jtag/interface.h>
  27 #include <jtag/hla/hla_layout.h>
  28 #include <jtag/hla/hla_transport.h>
  29 #include <jtag/hla/hla_interface.h>
  30 #include <target/target.h>
  31
  32 #include <target/cortex_m.h>
  33
  34 #include <libusb.h>
  35
  36 #define ICDI_WRITE_ENDPOINT 0x02
  37 #define ICDI_READ_ENDPOINT 0x83
  38
  39 #define ICDI_WRITE_TIMEOUT 1000
  40 #define ICDI_READ_TIMEOUT 1000
  41 #define ICDI_PACKET_SIZE 2048
  42
  43 #define PACKET_START "$"
  44 #define PACKET_END "#"
  45
  46 struct icdi_usb_handle_s {
  47         libusb_context *usb_ctx;
  48         libusb_device_handle *usb_dev;
  49
  50         char *read_buffer;
  51         char *write_buffer;
  52         int max_packet;
  53         int read_count;
  54         uint32_t max_rw_packet; /* max X packet (read/write memory) transfers */
  55 };
  56
  57 static int icdi_usb_read_mem(void *handle, uint32_t addr, uint32_t size,
  58                 uint32_t count, uint8_t *buffer);
  59 static int icdi_usb_write_mem(void *handle, uint32_t addr, uint32_t size,
  60                 uint32_t count, const uint8_t *buffer);
  61
  62 static int remote_escape_output(const char *buffer, int len, char *out_buf, int *out_len, int out_maxlen)
  63 {
  64         int input_index, output_index;
  65
  66         output_index = 0;
  67
  68         for (input_index = 0; input_index < len; input_index++) {
  69
  70                 char b = buffer[input_index];
  71
  72                 if (b == '$' || b == '#' || b == '}' || b == '*') {
  73                         /* These must be escaped.  */
  74                         if (output_index + 2 > out_maxlen)
  75                                 break;
  76                         out_buf[output_index++] = '}';
  77                         out_buf[output_index++] = b ^ 0x20;
  78                 } else {
  79                         if (output_index + 1 > out_maxlen)
  80                                 break;
  81                         out_buf[output_index++] = b;
  82                 }
  83         }
  84
  85         *out_len = input_index;
  86         return output_index;
  87 }
  88
  89 static int remote_unescape_input(const char *buffer, int len, char *out_buf, int out_maxlen)
  90 {
  91         int input_index, output_index;
  92         int escaped;
  93
  94         output_index = 0;
  95         escaped = 0;
  96
  97         for (input_index = 0; input_index < len; input_index++) {
  98
  99                 char b = buffer[input_index];
 100
 101                 if (output_index + 1 > out_maxlen)
 102                         LOG_ERROR("Received too much data from the target.");
 103
 104                 if (escaped) {
 105                         out_buf[output_index++] = b ^ 0x20;
 106                         escaped = 0;
 107                 } else if (b == '}')
 108                         escaped = 1;
 109                 else
 110                         out_buf[output_index++] = b;
 111         }
 112
 113         if (escaped)
 114                 LOG_ERROR("Unmatched escape character in target response.");
 115
 116         return output_index;
 117 }
 118
 119 static int icdi_send_packet(void *handle, int len)
 120 {
 121         unsigned char cksum = 0;
 122         struct icdi_usb_handle_s *h = handle;
 123         int result, retry = 0;
 124         int transferred = 0;
 125
 126         assert(handle != NULL);
 127
 128         /* check we have a large enough buffer for checksum "#00" */
 129         if (len + 3 > h->max_packet) {
 130                 LOG_ERROR("packet buffer too small");
 131                 return ERROR_FAIL;
 132         }
 133
 134         /* calculate checksum - offset start of packet */
 135         for (int i = 1; i < len; i++)
 136                 cksum += h->write_buffer[i];
 137
 138         len += sprintf(&h->write_buffer[len], PACKET_END "%02x", cksum);
 139
 140 #ifdef _DEBUG_USB_COMMS_
 141         char buffer[50];
 142         char ch = h->write_buffer[1];
 143         if (ch == 'x' || ch == 'X')
 144                 LOG_DEBUG("writing packet: <binary>");
 145         else {
 146                 memcpy(buffer, h->write_buffer, len >= 50 ? 50-1 : len);
 147                 buffer[len] = 0;
 148                 LOG_DEBUG("writing packet: %s", buffer);
 149         }
 150 #endif
 151
 152         while (1) {
 153
 154                 result = libusb_bulk_transfer(h->usb_dev, ICDI_WRITE_ENDPOINT, (unsigned char *)h->write_buffer, len,
 155                                 &transferred, ICDI_WRITE_TIMEOUT);
 156                 if (result != 0 || transferred != len) {
 157                         LOG_DEBUG("Error TX Data %d", result);
 158                         return ERROR_FAIL;
 159                 }
 160
 161                 /* check that the client got the message ok, or shall we resend */
 162                 result = libusb_bulk_transfer(h->usb_dev, ICDI_READ_ENDPOINT, (unsigned char *)h->read_buffer, h->max_packet,
 163                                         &transferred, ICDI_READ_TIMEOUT);
 164                 if (result != 0 || transferred < 1) {
 165                         LOG_DEBUG("Error RX Data %d", result);
 166                         return ERROR_FAIL;
 167                 }
 168
 169 #ifdef _DEBUG_USB_COMMS_
 170                 LOG_DEBUG("received reply: '%c' : count %d", h->read_buffer[0], transferred);
 171 #endif
 172
 173                 if (h->read_buffer[0] == '-') {
 174                         LOG_DEBUG("Resending packet %d", ++retry);
 175                 } else {
 176                         if (h->read_buffer[0] != '+')
 177                                 LOG_DEBUG("Unexpected Reply from ICDI: %c", h->read_buffer[0]);
 178                         break;
 179                 }
 180
 181                 if (retry == 3) {
 182                         LOG_DEBUG("maximum nack retries attempted");
 183                         return ERROR_FAIL;
 184                 }
 185         }
 186
 187         retry = 0;
 188         h->read_count = transferred;
 189
 190         while (1) {
 191
 192                 /* read reply from icdi */
 193                 result = libusb_bulk_transfer(h->usb_dev, ICDI_READ_ENDPOINT, (unsigned char *)h->read_buffer + h->read_count,
 194                                 h->max_packet - h->read_count, &transferred, ICDI_READ_TIMEOUT);
 195
 196 #ifdef _DEBUG_USB_COMMS_
 197                 LOG_DEBUG("received data: count %d", transferred);
 198 #endif
 199
 200                 /* check for errors but retry for timeout */
 201                 if (result != 0) {
 202
 203                         if (result == LIBUSB_ERROR_TIMEOUT) {
 204                                 LOG_DEBUG("Error RX timeout %d", result);
 205                         } else {
 206                                 LOG_DEBUG("Error RX Data %d", result);
 207                                 return ERROR_FAIL;
 208                         }
 209                 }
 210
 211                 h->read_count += transferred;
 212
 213                 /* we need to make sure we have a full packet, including checksum */
 214                 if (h->read_count > 5) {
 215
 216                         /* check that we have received an packet delimiter
 217                          * we do not validate the checksum
 218                          * reply should contain $...#AA - so we check for # */
 219                         if (h->read_buffer[h->read_count - 3] == '#')
 220                                 return ERROR_OK;
 221                 }
 222
 223                 if (retry++ == 3) {
 224                         LOG_DEBUG("maximum data retries attempted");
 225                         break;
 226                 }
 227         }
 228
 229         return ERROR_FAIL;
 230 }
 231
 232 static int icdi_send_cmd(void *handle, const char *cmd)
 233 {
 234         struct icdi_usb_handle_s *h = handle;
 235
 236         int cmd_len = snprintf(h->write_buffer, h->max_packet, PACKET_START "%s", cmd);
 237         return icdi_send_packet(handle, cmd_len);
 238 }
 239
 240 static int icdi_send_remote_cmd(void *handle, const char *data)
 241 {
 242         struct icdi_usb_handle_s *h = handle;
 243
 244         size_t cmd_len = sprintf(h->write_buffer, PACKET_START "qRcmd,");
 245         cmd_len += hexify(h->write_buffer + cmd_len, (const uint8_t *)data,
 246                 strlen(data), h->max_packet - cmd_len);
 247
 248         return icdi_send_packet(handle, cmd_len);
 249 }
 250
 251 static int icdi_get_cmd_result(void *handle)
 252 {
 253         struct icdi_usb_handle_s *h = handle;
 254         int offset = 0;
 255         char ch;
 256
 257         assert(handle != NULL);
 258
 259         do {
 260                 ch = h->read_buffer[offset++];
 261                 if (offset > h->read_count)
 262                         return ERROR_FAIL;
 263         } while (ch != '$');
 264
 265         if (memcmp("OK", h->read_buffer + offset, 2) == 0)
 266                 return ERROR_OK;
 267
 268         if (h->read_buffer[offset] == 'E') {
 269                 /* get error code */
 270                 uint8_t result;
 271                 if (unhexify(&result, h->read_buffer + offset + 1, 1) != 1)
 272                         return ERROR_FAIL;
 273                 return result;
 274         }
 275
 276         /* for now we assume everything else is ok */
 277         return ERROR_OK;
 278 }
 279
 280 static int icdi_usb_idcode(void *handle, uint32_t *idcode)
 281 {
 282         *idcode = 0;
 283         return ERROR_OK;
 284 }
 285
 286 static int icdi_usb_write_debug_reg(void *handle, uint32_t addr, uint32_t val)
 287 {
 288         uint8_t buf[4];
 289         /* REVISIT: There's no target pointer here so there's no way to use target_buffer_set_u32().
 290          * I guess all supported chips are little-endian anyway. */
 291         h_u32_to_le(buf, val);
 292         return icdi_usb_write_mem(handle, addr, 4, 1, buf);
 293 }
 294
 295 static enum target_state icdi_usb_state(void *handle)
 296 {
 297         int result;
 298         struct icdi_usb_handle_s *h = handle;
 299         uint32_t dhcsr;
 300         uint8_t buf[4];
 301
 302         result = icdi_usb_read_mem(h, DCB_DHCSR, 4, 1, buf);
 303         if (result != ERROR_OK)
 304                 return TARGET_UNKNOWN;
 305
 306         /* REVISIT: There's no target pointer here so there's no way to use target_buffer_get_u32().
 307          * I guess all supported chips are little-endian anyway. */
 308         dhcsr = le_to_h_u32(buf);
 309         if (dhcsr & S_HALT)
 310                 return TARGET_HALTED;
 311
 312         return TARGET_RUNNING;
 313 }
 314
 315 static int icdi_usb_version(void *handle)
 316 {
 317         struct icdi_usb_handle_s *h = handle;
 318
 319         char version[20];
 320
 321         /* get info about icdi */
 322         int result = icdi_send_remote_cmd(handle, "version");
 323         if (result != ERROR_OK)
 324                 return result;
 325
 326         if (h->read_count < 8) {
 327                 LOG_ERROR("Invalid Reply Received");
 328                 return ERROR_FAIL;
 329         }
 330
 331         /* convert reply */
 332         if (unhexify((uint8_t *)version, h->read_buffer + 2, 4) != 4) {
 333                 LOG_WARNING("unable to get ICDI version");
 334                 return ERROR_OK;
 335         }
 336
 337         /* null terminate and print info */
 338         version[4] = 0;
 339
 340         LOG_INFO("ICDI Firmware version: %s", version);
 341
 342         return ERROR_OK;
 343 }
 344
 345 static int icdi_usb_query(void *handle)
 346 {
 347         int result;
 348
 349         struct icdi_usb_handle_s *h = handle;
 350
 351         result = icdi_send_cmd(handle, "qSupported");
 352         if (result != ERROR_OK)
 353                 return result;
 354
 355         /* check result */
 356         result = icdi_get_cmd_result(handle);
 357         if (result != ERROR_OK) {
 358                 LOG_ERROR("query supported failed: 0x%x", result);
 359                 return ERROR_FAIL;
 360         }
 361
 362         /* from this we can get the max packet supported */
 363
 364         /* query packet buffer size */
 365         char *offset = strstr(h->read_buffer, "PacketSize");
 366         if (offset) {
 367                 char *separator;
 368                 int max_packet;
 369
 370                 max_packet = strtol(offset + 11, &separator, 16);
 371                 if (!max_packet)
 372                         LOG_ERROR("invalid max packet, using defaults");
 373                 else
 374                         h->max_packet = max_packet;
 375                 LOG_DEBUG("max packet supported : %i bytes", h->max_packet);
 376         }
 377
 378
 379         /* if required re allocate packet buffer */
 380         if (h->max_packet != ICDI_PACKET_SIZE) {
 381                 h->read_buffer = realloc(h->read_buffer, h->max_packet);
 382                 h->write_buffer = realloc(h->write_buffer, h->max_packet);
 383                 if (h->read_buffer == 0 || h->write_buffer == 0) {
 384                         LOG_ERROR("unable to reallocate memory");
 385                         return ERROR_FAIL;
 386                 }
 387         }
 388
 389         /* set extended mode */
 390         result = icdi_send_cmd(handle, "!");
 391         if (result != ERROR_OK)
 392                 return result;
 393
 394         /* check result */
 395         result = icdi_get_cmd_result(handle);
 396         if (result != ERROR_OK) {
 397                 LOG_ERROR("unable to enable extended mode: 0x%x", result);
 398                 return ERROR_FAIL;
 399         }
 400
 401         return ERROR_OK;
 402 }
 403
 404 static int icdi_usb_reset(void *handle)
 405 {
 406         /* we do this in hla_target.c */
 407         return ERROR_OK;
 408 }
 409
 410 static int icdi_usb_assert_srst(void *handle, int srst)
 411 {
 412         /* TODO not supported yet */
 413         return ERROR_COMMAND_NOTFOUND;
 414 }
 415
 416 static int icdi_usb_run(void *handle)
 417 {
 418         int result;
 419
 420         /* resume target at current address */
 421         result = icdi_send_cmd(handle, "c");
 422         if (result != ERROR_OK)
 423                 return result;
 424
 425         /* check result */
 426         result = icdi_get_cmd_result(handle);
 427         if (result != ERROR_OK) {
 428                 LOG_ERROR("continue failed: 0x%x", result);
 429                 return ERROR_FAIL;
 430         }
 431
 432         return result;
 433 }
 434
 435 static int icdi_usb_halt(void *handle)
 436 {
 437         int result;
 438
 439         /* this query halts the target ?? */
 440         result = icdi_send_cmd(handle, "?");
 441         if (result != ERROR_OK)
 442                 return result;
 443
 444         /* check result */
 445         result = icdi_get_cmd_result(handle);
 446         if (result != ERROR_OK) {
 447                 LOG_ERROR("halt failed: 0x%x", result);
 448                 return ERROR_FAIL;
 449         }
 450
 451         return result;
 452 }
 453
 454 static int icdi_usb_step(void *handle)
 455 {
 456         int result;
 457
 458         /* step target at current address */
 459         result = icdi_send_cmd(handle, "s");
 460         if (result != ERROR_OK)
 461                 return result;
 462
 463         /* check result */
 464         result = icdi_get_cmd_result(handle);
 465         if (result != ERROR_OK) {
 466                 LOG_ERROR("step failed: 0x%x", result);
 467                 return ERROR_FAIL;
 468         }
 469
 470         return result;
 471 }
 472
 473 static int icdi_usb_read_regs(void *handle)
 474 {
 475         /* currently unsupported */
 476         return ERROR_OK;
 477 }
 478
 479 static int icdi_usb_read_reg(void *handle, int num, uint32_t *val)
 480 {
 481         int result;
 482         struct icdi_usb_handle_s *h = handle;
 483         char cmd[10];
 484
 485         snprintf(cmd, sizeof(cmd), "p%x", num);
 486         result = icdi_send_cmd(handle, cmd);
 487         if (result != ERROR_OK)
 488                 return result;
 489
 490         /* check result */
 491         result = icdi_get_cmd_result(handle);
 492         if (result != ERROR_OK) {
 493                 LOG_ERROR("register read failed: 0x%x", result);
 494                 return ERROR_FAIL;
 495         }
 496
 497         /* convert result */
 498         uint8_t buf[4];
 499         if (unhexify(buf, h->read_buffer + 2, 4) != 4) {
 500                 LOG_ERROR("failed to convert result");
 501                 return ERROR_FAIL;
 502         }
 503         *val = le_to_h_u32(buf);
 504
 505         return result;
 506 }
 507
 508 static int icdi_usb_write_reg(void *handle, int num, uint32_t val)
 509 {
 510         int result;
 511         char cmd[20];
 512         uint8_t buf[4];
 513         h_u32_to_le(buf, val);
 514
 515         int cmd_len = snprintf(cmd, sizeof(cmd), "P%x=", num);
 516         hexify(cmd + cmd_len, buf, 4, sizeof(cmd));
 517
 518         result = icdi_send_cmd(handle, cmd);
 519         if (result != ERROR_OK)
 520                 return result;
 521
 522         /* check result */
 523         result = icdi_get_cmd_result(handle);
 524         if (result != ERROR_OK) {
 525                 LOG_ERROR("register write failed: 0x%x", result);
 526                 return ERROR_FAIL;
 527         }
 528
 529         return result;
 530 }
 531
 532 static int icdi_usb_read_mem_int(void *handle, uint32_t addr, uint32_t len, uint8_t *buffer)
 533 {
 534         int result;
 535         struct icdi_usb_handle_s *h = handle;
 536         char cmd[20];
 537
 538         snprintf(cmd, sizeof(cmd), "x%" PRIx32 ",%" PRIx32, addr, len);
 539         result = icdi_send_cmd(handle, cmd);
 540         if (result != ERROR_OK)
 541                 return result;
 542
 543         /* check result */
 544         result = icdi_get_cmd_result(handle);
 545         if (result != ERROR_OK) {
 546                 LOG_ERROR("memory read failed: 0x%x", result);
 547                 return ERROR_FAIL;
 548         }
 549
 550         /* unescape input */
 551         int read_len = remote_unescape_input(h->read_buffer + 5, h->read_count - 8, (char *)buffer, len);
 552         if (read_len != (int)len) {
 553                 LOG_ERROR("read more bytes than expected: actual 0x%x expected 0x%" PRIx32, read_len, len);
 554                 return ERROR_FAIL;
 555         }
 556
 557         return ERROR_OK;
 558 }
 559
 560 static int icdi_usb_write_mem_int(void *handle, uint32_t addr, uint32_t len, const uint8_t *buffer)
 561 {
 562         int result;
 563         struct icdi_usb_handle_s *h = handle;
 564
 565         size_t cmd_len = snprintf(h->write_buffer, h->max_packet, PACKET_START "X%" PRIx32 ",%" PRIx32 ":", addr, len);
 566
 567         int out_len;
 568         cmd_len += remote_escape_output((const char *)buffer, len, h->write_buffer + cmd_len,
 569                         &out_len, h->max_packet - cmd_len);
 570
 571         if (out_len < (int)len) {
 572                 /* for now issue a error as we have no way of allocating a larger buffer */
 573                 LOG_ERROR("memory buffer too small: requires 0x%x actual 0x%" PRIx32, out_len, len);
 574                 return ERROR_FAIL;
 575         }
 576
 577         result = icdi_send_packet(handle, cmd_len);
 578         if (result != ERROR_OK)
 579                 return result;
 580
 581         /* check result */
 582         result = icdi_get_cmd_result(handle);
 583         if (result != ERROR_OK) {
 584                 LOG_ERROR("memory write failed: 0x%x", result);
 585                 return ERROR_FAIL;
 586         }
 587
 588         return ERROR_OK;
 589 }
 590
 591 static int icdi_usb_read_mem(void *handle, uint32_t addr, uint32_t size,
 592                 uint32_t count, uint8_t *buffer)
 593 {
 594         int retval = ERROR_OK;
 595         struct icdi_usb_handle_s *h = handle;
 596         uint32_t bytes_remaining;
 597
 598         /* calculate byte count */
 599         count *= size;
 600
 601         while (count) {
 602
 603                 bytes_remaining = h->max_rw_packet;
 604                 if (count < bytes_remaining)
 605                         bytes_remaining = count;
 606
 607                 retval = icdi_usb_read_mem_int(handle, addr, bytes_remaining, buffer);
 608                 if (retval != ERROR_OK)
 609                         return retval;
 610
 611                 buffer += bytes_remaining;
 612                 addr += bytes_remaining;
 613                 count -= bytes_remaining;
 614         }
 615
 616         return retval;
 617 }
 618
 619 static int icdi_usb_write_mem(void *handle, uint32_t addr, uint32_t size,
 620                 uint32_t count, const uint8_t *buffer)
 621 {
 622         int retval = ERROR_OK;
 623         struct icdi_usb_handle_s *h = handle;
 624         uint32_t bytes_remaining;
 625
 626         /* calculate byte count */
 627         count *= size;
 628
 629         while (count) {
 630
 631                 bytes_remaining = h->max_rw_packet;
 632                 if (count < bytes_remaining)
 633                         bytes_remaining = count;
 634
 635                 retval = icdi_usb_write_mem_int(handle, addr, bytes_remaining, buffer);
 636                 if (retval != ERROR_OK)
 637                         return retval;
 638
 639                 buffer += bytes_remaining;
 640                 addr += bytes_remaining;
 641                 count -= bytes_remaining;
 642         }
 643
 644         return retval;
 645 }
 646
 647 static int icdi_usb_override_target(const char *targetname)
 648 {
 649         return !strcmp(targetname, "cortex_m");
 650 }
 651
 652 static int icdi_usb_close(void *handle)
 653 {
 654         struct icdi_usb_handle_s *h = handle;
 655
 656         if (!h)
 657                 return ERROR_OK;
 658
 659         if (h->usb_dev)
 660                 libusb_close(h->usb_dev);
 661
 662         if (h->usb_ctx)
 663                 libusb_exit(h->usb_ctx);
 664
 665         if (h->read_buffer)
 666                 free(h->read_buffer);
 667
 668         if (h->write_buffer)
 669                 free(h->write_buffer);
 670
 671         free(handle);
 672
 673         return ERROR_OK;
 674 }
 675
 676 static int icdi_usb_open(struct hl_interface_param_s *param, void **fd)
 677 {
 678         int retval;
 679         struct icdi_usb_handle_s *h;
 680
 681         LOG_DEBUG("icdi_usb_open");
 682
 683         h = calloc(1, sizeof(struct icdi_usb_handle_s));
 684
 685         if (h == 0) {
 686                 LOG_ERROR("unable to allocate memory");
 687                 return ERROR_FAIL;
 688         }
 689
 690         LOG_DEBUG("transport: %d vid: 0x%04x pid: 0x%04x", param->transport,
 691                   param->vid[0], param->pid[0]);
 692
 693         /* TODO: convert libusb_ calls to jtag_libusb_ */
 694         if (param->vid[1])
 695                 LOG_WARNING("Bad configuration: 'hla_vid_pid' command does not accept more than one VID PID pair on ti-icdi!");
 696
 697         if (libusb_init(&h->usb_ctx) != 0) {
 698                 LOG_ERROR("libusb init failed");
 699                 goto error_open;
 700         }
 701
 702         h->usb_dev = libusb_open_device_with_vid_pid(h->usb_ctx, param->vid[0], param->pid[0]);
 703         if (!h->usb_dev) {
 704                 LOG_ERROR("open failed");
 705                 goto error_open;
 706         }
 707
 708         if (libusb_claim_interface(h->usb_dev, 2)) {
 709                 LOG_DEBUG("claim interface failed");
 710                 goto error_open;
 711         }
 712
 713         /* check if mode is supported */
 714         retval = ERROR_OK;
 715
 716         switch (param->transport) {
 717 #if 0
 718                 /* TODO place holder as swd is not currently supported */
 719                 case HL_TRANSPORT_SWD:
 720 #endif
 721                 case HL_TRANSPORT_JTAG:
 722                         break;
 723                 default:
 724                         retval = ERROR_FAIL;
 725                         break;
 726         }
 727
 728         if (retval != ERROR_OK) {
 729                 LOG_ERROR("mode (transport) not supported by device");
 730                 goto error_open;
 731         }
 732
 733         /* allocate buffer */
 734         h->read_buffer = malloc(ICDI_PACKET_SIZE);
 735         h->write_buffer = malloc(ICDI_PACKET_SIZE);
 736         h->max_packet = ICDI_PACKET_SIZE;
 737
 738         if (h->read_buffer == 0 || h->write_buffer == 0) {
 739                 LOG_DEBUG("malloc failed");
 740                 goto error_open;
 741         }
 742
 743         /* query icdi version etc */
 744         retval = icdi_usb_version(h);
 745         if (retval != ERROR_OK)
 746                 goto error_open;
 747
 748         /* query icdi support */
 749         retval = icdi_usb_query(h);
 750         if (retval != ERROR_OK)
 751                 goto error_open;
 752
 753         *fd = h;
 754
 755         /* set the max target read/write buffer in bytes
 756          * as we are using gdb binary packets to transfer memory we have to
 757          * reserve half the buffer for any possible escape chars plus
 758          * at least 64 bytes for the gdb packet header */
 759         h->max_rw_packet = (((h->max_packet - 64) / 4) * 4) / 2;
 760
 761         return ERROR_OK;
 762
 763 error_open:
 764         icdi_usb_close(h);
 765
 766         return ERROR_FAIL;
 767 }
 768
 769 struct hl_layout_api_s icdi_usb_layout_api = {
 770         .open = icdi_usb_open,
 771         .close = icdi_usb_close,
 772         .idcode = icdi_usb_idcode,
 773         .state = icdi_usb_state,
 774         .reset = icdi_usb_reset,
 775         .assert_srst = icdi_usb_assert_srst,
 776         .run = icdi_usb_run,
 777         .halt = icdi_usb_halt,
 778         .step = icdi_usb_step,
 779         .read_regs = icdi_usb_read_regs,
 780         .read_reg = icdi_usb_read_reg,
 781         .write_reg = icdi_usb_write_reg,
 782         .read_mem = icdi_usb_read_mem,
 783         .write_mem = icdi_usb_write_mem,
 784         .write_debug_reg = icdi_usb_write_debug_reg,
 785         .override_target = icdi_usb_override_target,
 786         .custom_command = icdi_send_remote_cmd,
 787 };