src/jtag/drivers/usb_blaster.c

   1 /***************************************************************************
   2  *   Driver for USB-JTAG, Altera USB-Blaster and compatibles               *
   3  *   Original code from Kolja Waschk's USB-JTAG project                    *
   4  *     (http://www.ixo.de/info/usb_jtag/).                                 *
   5  *   Some updates by Anthony Liu (2006).                                   *
   6  *   Minor updates and cleanup by Catalin Patulea (2009).                  *
   7  *   Speed updates by Ali Lown (2011).                                     *
   8  *                                                                         *
   9  *   Copyright (C) 2011 Ali Lown                                           *
  10  *   ali@lown.me.uk                                                        *
  11  *                                                                         *
  12  *   Copyright (C) 2009 Catalin Patulea                                    *
  13  *   cat@vv.carleton.ca                                                    *
  14  *                                                                         *
  15  *   Copyright (C) 2006 Kolja Waschk                                       *
  16  *   usbjtag@ixo.de                                                        *
  17  *                                                                         *
  18  *   Based on ft2232.c and bitbang.c,                                      *
  19  *   Copyright (C) 2004,2006 by Dominic Rath                               *
  20  *                                                                         *
  21  *   This program is free software; you can redistribute it and/or modify  *
  22  *   it under the terms of the GNU General Public License as published by  *
  23  *   the Free Software Foundation; either version 2 of the License, or     *
  24  *   (at your option) any later version.                                   *
  25  *                                                                         *
  26  *   This program is distributed in the hope that it will be useful,       *
  27  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  28  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  29  *   GNU General Public License for more details.                          *
  30  *                                                                         *
  31  *   You should have received a copy of the GNU General Public License     *
  32  *   along with this program; if not, write to the                         *
  33  *   Free Software Foundation, Inc.,                                       *
  34  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  35  ***************************************************************************/
  36
  37 /*
  38  * The following information is originally from Kolja Waschk's USB-JTAG,
  39  * where it was obtained by reverse engineering an Altera USB-Blaster.
  40  * See http://www.ixo.de/info/usb_jtag/ for USB-Blaster block diagram and
  41  * usb_jtag-20080705-1200.zip#usb_jtag/host/openocd for protocol.
  42  *
  43  * The same information is also on the UrJTAG mediawiki, with some additional
  44  * notes on bits marked as "unknown" by usb_jtag.
  45  * (http://sourceforge.net/apps/mediawiki/urjtag/index.php?
  46  *    title=Cable_Altera_USB-Blaster)
  47  *
  48  * USB-JTAG, Altera USB-Blaster and compatibles are typically implemented as
  49  * an FTDIChip FT245 followed by a CPLD which handles a two-mode protocol:
  50  *
  51  *            _________
  52  *           |         |
  53  *           | AT93C46 |
  54  *           |_________|
  55  *            __|__________    _________
  56  *           |             |  |         |
  57  *      USB__| FTDI 245BM  |__| EPM7064 |__JTAG (B_TDO,B_TDI,B_TMS,B_TCK)
  58  *           |_____________|  |_________|
  59  *            __|__________    _|___________
  60  *           |             |  |             |
  61  *           | 6 MHz XTAL  |  | 24 MHz Osc. |
  62  *           |_____________|  |_____________|
  63  *
  64  * Protocol details are given in the code below.
  65  *
  66  * It is also possible to emulate this configuration using a single-chip USB
  67  * controller like the Cypress FX2 (again, see usb_jtag for details).
  68  */
  69 #ifdef HAVE_CONFIG_H
  70 #include "config.h"
  71 #endif
  72
  73 #if IS_CYGWIN == 1
  74 #include "windows.h"
  75 #undef LOG_ERROR
  76 #endif
  77
  78 /* project specific includes */
  79 #include <jtag/interface.h>
  80 #include <jtag/commands.h>
  81 #include <helper/time_support.h>
  82
  83 /* system includes */
  84 #include <string.h>
  85 #include <stdlib.h>
  86 #include <unistd.h>
  87
  88 #include "bitbang.h"
  89
  90 #if (BUILD_USB_BLASTER_FTD2XX == 1 && BUILD_USB_BLASTER_LIBFTDI == 1)
  91 #error "BUILD_USB_BLASTER_FTD2XX && BUILD_USB_BLASTER_LIBFTDI "
  92            "are mutually exclusive"
  93 #elif (BUILD_USB_BLASTER_FTD2XX != 1 && BUILD_USB_BLASTER_LIBFTDI != 1)
  94 #error "BUILD_USB_BLASTER_FTD2XX || BUILD_USB_BLASTER_LIBFTDI must be chosen"
  95 #endif
  96
  97 /* USB_BLASTER access library includes */
  98 #if BUILD_USB_BLASTER_FTD2XX == 1
  99 #include <ftd2xx.h>
 100 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 101 #include <ftdi.h>
 102 #endif
 103
 104 #include <sys/time.h>
 105 #include <time.h>
 106
 107 static char *usb_blaster_device_desc;
 108 static uint16_t usb_blaster_vid = 0x09fb; /* Altera */
 109 static uint16_t usb_blaster_pid = 0x6001; /* USB-Blaster */
 110
 111 /* last output byte in simple bit banging (legacy) mode */
 112 static uint8_t out_value;
 113 /* global output buffer for bit banging */
 114 #define BUF_LEN 64 //Size of EP1
 115 static uint8_t out_buffer[BUF_LEN];
 116 static uint16_t out_count = 0;
 117
 118 #if BUILD_USB_BLASTER_FTD2XX == 1
 119 static FT_HANDLE ftdih;
 120 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 121 static struct ftdi_context ftdic;
 122 #endif
 123
 124 static int usb_blaster_buf_write(
 125         uint8_t *buf, int size, uint32_t *bytes_written)
 126 {
 127 #if BUILD_USB_BLASTER_FTD2XX == 1
 128         FT_STATUS status;
 129         DWORD dw_bytes_written;
 130
 131 #ifdef _DEBUG_JTAG_IO_
 132         LOG_DEBUG("usb_blaster_buf_write %02X (%d)", buf[0], size);
 133 #endif
 134         status = FT_Write(ftdih, buf, size, &dw_bytes_written);
 135         if (status != FT_OK)
 136         {
 137                 *bytes_written = dw_bytes_written;
 138                 LOG_ERROR("FT_Write returned: %lu", status);
 139                 return ERROR_JTAG_DEVICE_ERROR;
 140         }
 141         *bytes_written = dw_bytes_written;
 142         return ERROR_OK;
 143 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 144         int retval;
 145 #ifdef _DEBUG_JTAG_IO_
 146         LOG_DEBUG("usb_blaster_buf_write %02X (%d)", buf[0], size);
 147 #endif
 148         retval = ftdi_write_data(&ftdic, buf, size);
 149         if (retval < 0)
 150         {
 151                 *bytes_written = 0;
 152                 LOG_ERROR("ftdi_write_data: %s", ftdi_get_error_string(&ftdic));
 153                 return ERROR_JTAG_DEVICE_ERROR;
 154         }
 155         *bytes_written = retval;
 156         return ERROR_OK;
 157 #endif
 158 }
 159
 160 static int
 161 usb_blaster_buf_read(uint8_t *buf, unsigned size, uint32_t *bytes_read)
 162 {
 163 #if BUILD_USB_BLASTER_FTD2XX == 1
 164         DWORD dw_bytes_read;
 165         FT_STATUS status;
 166
 167         status = FT_Read(ftdih, buf, size, &dw_bytes_read);
 168         if (status != FT_OK)
 169         {
 170                 *bytes_read = dw_bytes_read;
 171                 LOG_ERROR("FT_Read returned: %lu", status);
 172                 return ERROR_JTAG_DEVICE_ERROR;
 173         }
 174 #ifdef _DEBUG_JTAG_IO_
 175         LOG_DEBUG("usb_blaster_buf_read %02X (%lu)", buf[0], dw_bytes_read);
 176 #endif
 177         *bytes_read = dw_bytes_read;
 178         return ERROR_OK;
 179
 180 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 181         int retval;
 182         int timeout = 100;
 183
 184         *bytes_read = 0;
 185         while ((*bytes_read < size) && timeout--)
 186         {
 187                 retval = ftdi_read_data(&ftdic, buf + *bytes_read,
 188                                 size - *bytes_read);
 189                 if (retval < 0)
 190                 {
 191                         *bytes_read = 0;
 192                         LOG_ERROR("ftdi_read_data: %s",
 193                                         ftdi_get_error_string(&ftdic));
 194                         return ERROR_JTAG_DEVICE_ERROR;
 195                 }
 196                 *bytes_read += retval;
 197         }
 198 #ifdef _DEBUG_JTAG_IO_
 199         LOG_DEBUG("usb_blaster_buf_read %02X (%d)", buf[0], *bytes_read);
 200 #endif
 201         return ERROR_OK;
 202 #endif
 203 }
 204
 205 /* The following code doesn't fully utilize the possibilities of the
 206  * USB-Blaster. It only buffers data up to the maximum packet size of 64 bytes.
 207  *
 208  * Actually, the USB-Blaster offers a byte-shift mode to transmit up to 504 data
 209  * bits (bidirectional) in a single USB packet. A header byte has to be sent as
 210  * the first byte in a packet with the following meaning:
 211  *
 212  *   Bit 7 (0x80): Must be set to indicate byte-shift mode.
 213  *   Bit 6 (0x40): If set, the USB-Blaster will also read data, not just write.
 214  *   Bit 5..0:     Define the number N of following bytes
 215  *
 216  * All N following bytes will then be clocked out serially on TDI. If Bit 6 was
 217  * set, it will afterwards return N bytes with TDO data read while clocking out
 218  * the TDI data. LSB of the first byte after the header byte will appear first
 219  * on TDI.
 220  */
 221
 222 /* Simple bit banging mode:
 223  *
 224  *   Bit 7 (0x80): Must be zero (see byte-shift mode above)
 225  *   Bit 6 (0x40): If set, you will receive a byte indicating the state of TDO
 226  *                 in return.
 227  *   Bit 5 (0x20): Output Enable/LED.
 228  *   Bit 4 (0x10): TDI Output.
 229  *   Bit 3 (0x08): nCS Output (not used in JTAG mode).
 230  *   Bit 2 (0x04): nCE Output (not used in JTAG mode).
 231  *   Bit 1 (0x02): TMS Output.
 232  *   Bit 0 (0x01): TCK Output.
 233  *
 234  * For transmitting a single data bit, you need to write two bytes. Up to 64
 235  * bytes can be combined in a single USB packet.
 236  * It isn't possible to read a data without transmitting data.
 237  */
 238
 239 #define TCK                     (1 << 0)
 240 #define TMS                     (1 << 1)
 241 #define NCE                     (1 << 2)
 242 #define NCS                     (1 << 3)
 243 #define TDI                     (1 << 4)
 244 #define LED                     (1 << 5)
 245 #define READ            (1 << 6)
 246 #define SHMODE          (1 << 7)
 247 #define OTHERS          ((1 << 2) | (1 << 3) | (1 << 5))
 248
 249 #define READ_TDO        (1 << 0)
 250
 251 static void usb_blaster_write_databuffer(uint8_t* buf, uint16_t len)
 252 {
 253         uint32_t bytes_written;
 254         usb_blaster_buf_write(buf, len, &bytes_written);
 255         out_count = 0;
 256 #ifdef _DEBUG_JTAG_IO_
 257         LOG_DEBUG("---- WROTE %d",bytes_written);
 258 #endif
 259 }
 260
 261 static void usb_blaster_addtowritebuffer(uint8_t value, bool forcewrite)
 262 {
 263         out_buffer[out_count] = value;
 264         out_count += 1;
 265         if(out_count == BUF_LEN || forcewrite)
 266                 usb_blaster_write_databuffer(out_buffer, out_count);
 267 }
 268
 269 static int usb_blaster_read_data(void)
 270 {
 271         int status;
 272         uint8_t buf[1];
 273         uint32_t bytes_read;
 274
 275         if(out_count > 0)
 276                 usb_blaster_write_databuffer(out_buffer, out_count);
 277
 278         out_value |= READ;
 279         usb_blaster_addtowritebuffer(out_value, true);
 280         out_value &= ~READ;
 281
 282         status = usb_blaster_buf_read(buf, 1, &bytes_read);
 283         if (status < 0)
 284                 return 0;
 285
 286         return !!(buf[0] & READ_TDO);
 287 }
 288
 289 static void usb_blaster_write(int tck, int tms, int tdi)
 290 {
 291 #ifdef _DEBUG_JTAG_IO_
 292         LOG_DEBUG("---- usb_blaster_write(%d,%d,%d)", tck, tms, tdi);
 293 #endif
 294         out_value &= ~(TCK | TMS | TDI);
 295         if (tck)
 296                 out_value |= TCK;
 297         if (tms)
 298                 out_value |= TMS;
 299         if (tdi)
 300                 out_value |= TDI;
 301
 302         usb_blaster_addtowritebuffer(out_value, false);
 303 }
 304
 305 static int usb_blaster_speed(int speed)
 306 {
 307 #if BUILD_USB_BLASTER_FTD2XX == 1
 308         LOG_DEBUG("TODO: usb_blaster_speed() isn't implemented for libftd2xx!");
 309 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 310         LOG_DEBUG("TODO: usb_blaster_speed() isn't optimally implemented!");
 311
 312         /* TODO: libftdi's ftdi_set_baudrate chokes on high rates, use lowlevel
 313          * usb function instead! And additionally allow user to throttle.
 314          */
 315         if (ftdi_set_baudrate(&ftdic, 3000000 / 4) < 0)
 316         {
 317                 LOG_ERROR("Can't set baud rate to max: %s",
 318                         ftdi_get_error_string(&ftdic));
 319                 return ERROR_JTAG_DEVICE_ERROR;
 320         };
 321 #endif
 322
 323         return ERROR_OK;
 324 }
 325
 326 static void usb_blaster_reset(int trst, int srst)
 327 {
 328         LOG_DEBUG("TODO: usb_blaster_reset(%d,%d) isn't implemented!",
 329                         trst, srst);
 330 }
 331
 332 static void usb_blaster_blink(int state)
 333 {
 334         out_value = 0x00;
 335         if(state)
 336                 out_value |= LED;
 337
 338         usb_blaster_addtowritebuffer(out_value, true);
 339 }
 340
 341 static struct bitbang_interface usb_blaster_bitbang = {
 342         .read = usb_blaster_read_data,
 343         .write = usb_blaster_write,
 344         .reset = usb_blaster_reset,
 345         .blink = usb_blaster_blink,
 346 };
 347
 348 static int usb_blaster_init(void)
 349 {
 350         uint8_t latency_timer;
 351
 352 #if BUILD_USB_BLASTER_FTD2XX == 1
 353         FT_STATUS status;
 354 #endif
 355
 356 #if BUILD_USB_BLASTER_FTD2XX == 1
 357         LOG_DEBUG("'usb_blaster' interface using FTD2XX");
 358 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 359         LOG_DEBUG("'usb_blaster' interface using libftdi");
 360 #endif
 361
 362 #if BUILD_USB_BLASTER_FTD2XX == 1
 363         /* Open by device description */
 364         if (usb_blaster_device_desc == NULL)
 365         {
 366                 LOG_WARNING("no usb_blaster device description specified, "
 367                                         "using default 'USB-Blaster'");
 368                 usb_blaster_device_desc = "USB-Blaster";
 369         }
 370
 371 #if IS_WIN32 == 0
 372         /* Add non-standard Vid/Pid to the linux driver */
 373         status = FT_SetVIDPID(usb_blaster_vid, usb_blaster_pid);
 374         if (status != FT_OK)
 375         {
 376                 LOG_WARNING("couldn't add %4.4x:%4.4x",
 377                         usb_blaster_vid, usb_blaster_pid);
 378         }
 379 #endif
 380
 381         status = FT_OpenEx(usb_blaster_device_desc, FT_OPEN_BY_DESCRIPTION,
 382                         &ftdih);
 383         if (status != FT_OK)
 384         {
 385                 DWORD num_devices;
 386
 387                 LOG_ERROR("unable to open ftdi device: %lu", status);
 388                 status = FT_ListDevices(&num_devices, NULL,
 389                                 FT_LIST_NUMBER_ONLY);
 390                 if (status == FT_OK)
 391                 {
 392                         char **desc_array = malloc(sizeof(char *)
 393                                                 * (num_devices + 1));
 394                         unsigned int i;
 395
 396                         for (i = 0; i < num_devices; i++)
 397                                 desc_array[i] = malloc(64);
 398                         desc_array[num_devices] = NULL;
 399
 400                         status = FT_ListDevices(desc_array, &num_devices,
 401                                 FT_LIST_ALL | FT_OPEN_BY_DESCRIPTION);
 402
 403                         if (status == FT_OK)
 404                         {
 405                                 LOG_ERROR("ListDevices: %lu", num_devices);
 406                                 for (i = 0; i < num_devices; i++)
 407                                         LOG_ERROR("%i: %s", i, desc_array[i]);
 408                         }
 409
 410                         for (i = 0; i < num_devices; i++)
 411                                 free(desc_array[i]);
 412                         free(desc_array);
 413                 }
 414                 else
 415                 {
 416                         printf("ListDevices: NONE\n");
 417                 }
 418                 return ERROR_JTAG_INIT_FAILED;
 419         }
 420
 421         status = FT_SetLatencyTimer(ftdih, 2);
 422         if (status != FT_OK)
 423         {
 424                 LOG_ERROR("unable to set latency timer: %lu", status);
 425                 return ERROR_JTAG_INIT_FAILED;
 426         }
 427
 428         status = FT_GetLatencyTimer(ftdih, &latency_timer);
 429         if (status != FT_OK)
 430         {
 431                 LOG_ERROR("unable to get latency timer: %lu", status);
 432                 return ERROR_JTAG_INIT_FAILED;
 433         }
 434         LOG_DEBUG("current latency timer: %i", latency_timer);
 435
 436         status = FT_SetBitMode(ftdih, 0x00, 0);
 437         if (status != FT_OK)
 438         {
 439                 LOG_ERROR("unable to disable bit i/o mode: %lu", status);
 440                 return ERROR_JTAG_INIT_FAILED;
 441         }
 442 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 443         if (ftdi_init(&ftdic) < 0)
 444                 return ERROR_JTAG_INIT_FAILED;
 445
 446         /* context, vendor id, product id */
 447         if (ftdi_usb_open(&ftdic, usb_blaster_vid, usb_blaster_pid) < 0)
 448         {
 449                 LOG_ERROR("unable to open ftdi device: %s", ftdic.error_str);
 450                 return ERROR_JTAG_INIT_FAILED;
 451         }
 452
 453         if (ftdi_usb_reset(&ftdic) < 0)
 454         {
 455                 LOG_ERROR("unable to reset ftdi device");
 456                 return ERROR_JTAG_INIT_FAILED;
 457         }
 458
 459         if (ftdi_set_latency_timer(&ftdic, 2) < 0)
 460         {
 461                 LOG_ERROR("unable to set latency timer");
 462                 return ERROR_JTAG_INIT_FAILED;
 463         }
 464
 465         if (ftdi_get_latency_timer(&ftdic, &latency_timer) < 0)
 466         {
 467                 LOG_ERROR("unable to get latency timer");
 468                 return ERROR_JTAG_INIT_FAILED;
 469         }
 470         LOG_DEBUG("current latency timer: %u", latency_timer);
 471
 472         ftdi_disable_bitbang(&ftdic);
 473 #endif
 474
 475         bitbang_interface = &usb_blaster_bitbang;
 476
 477 #if 0
 478 #if BUILD_USB_BLASTER_FTD2XX == 1
 479         if ((status = FT_Purge(ftdih, FT_PURGE_RX | FT_PURGE_TX)) != FT_OK)
 480         {
 481                 LOG_ERROR("error purging ftd2xx device: %i", status);
 482                 return ERROR_JTAG_INIT_FAILED;
 483         }
 484 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 485         if (ftdi_usb_purge_buffers(&ftdic) < 0)
 486         {
 487                 LOG_ERROR("ftdi_purge_buffers: %s", ftdic.error_str);
 488                 return ERROR_JTAG_INIT_FAILED;
 489         }
 490 #endif
 491 #endif
 492
 493         return ERROR_OK;
 494 }
 495
 496 static int usb_blaster_quit(void)
 497 {
 498         if(out_count > 0)
 499                 usb_blaster_write_databuffer(out_buffer, out_count);
 500
 501 #if BUILD_USB_BLASTER_FTD2XX == 1
 502         FT_STATUS status;
 503
 504         status = FT_Close(ftdih);
 505 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 506         ftdi_usb_close(&ftdic);
 507         ftdi_deinit(&ftdic);
 508 #endif
 509
 510         return ERROR_OK;
 511 }
 512
 513 COMMAND_HANDLER(usb_blaster_handle_device_desc_command)
 514 {
 515         if (CMD_ARGC == 1)
 516                 usb_blaster_device_desc = strdup(CMD_ARGV[0]);
 517         else
 518                 LOG_ERROR("require exactly one argument to "
 519                                   "usb_blaster_device_desc <description>");
 520
 521         return ERROR_OK;
 522 }
 523
 524 COMMAND_HANDLER(usb_blaster_handle_vid_pid_command)
 525 {
 526         if (CMD_ARGC > 2)
 527         {
 528                 LOG_WARNING("ignoring extra IDs in usb_blaster_vid_pid "
 529                                         "(maximum is 1 pair)");
 530                 CMD_ARGC = 2;
 531         }
 532         if (CMD_ARGC == 2)
 533         {
 534                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], usb_blaster_vid);
 535                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[1], usb_blaster_pid);
 536         }
 537         else
 538                 LOG_WARNING("incomplete usb_blaster_vid_pid configuration");
 539
 540         return ERROR_OK;
 541 }
 542
 543 COMMAND_HANDLER(usb_blaster_handle_pin_command)
 544 {
 545         if (CMD_ARGC == 2)
 546         {
 547                 const char * const pin_name = CMD_ARGV[0];
 548                 uint8_t mask;
 549                 unsigned int state;
 550
 551                 if (!strcmp(pin_name, "pin6"))
 552                         mask = NCE;
 553                 else if (!strcmp(pin_name, "pin8"))
 554                         mask = NCS;
 555                 else
 556                 {
 557                         LOG_ERROR("%s: pin name must be \"pin6\" or \"pin8\"",
 558                                         CMD_NAME);
 559                         return ERROR_COMMAND_SYNTAX_ERROR;
 560                 }
 561
 562                 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[1], state);
 563                 if (state == 0)
 564                 {
 565                         out_value &= ~mask;
 566                         usb_blaster_addtowritebuffer(out_value, true);
 567                 }
 568                 else if (state == 1)
 569                 {
 570                         out_value |= mask;
 571                         usb_blaster_addtowritebuffer(out_value, true);
 572                 }
 573                 else
 574                 {
 575                         LOG_ERROR("%s: pin state must be 0 or 1", CMD_NAME);
 576                         return ERROR_COMMAND_SYNTAX_ERROR;
 577                 }
 578
 579                 return ERROR_OK;
 580         }
 581         else
 582         {
 583                 LOG_ERROR("%s takes exactly two arguments", CMD_NAME);
 584                 return ERROR_COMMAND_SYNTAX_ERROR;
 585         }
 586 }
 587
 588 static const struct command_registration usb_blaster_command_handlers[] = {
 589         {
 590                 .name = "usb_blaster_device_desc",
 591                 .handler = usb_blaster_handle_device_desc_command,
 592                 .mode = COMMAND_CONFIG,
 593                 .help = "set the USB device description of the USB-Blaster",
 594                 .usage = "description-string",
 595         },
 596         {
 597                 .name = "usb_blaster_vid_pid",
 598                 .handler = usb_blaster_handle_vid_pid_command,
 599                 .mode = COMMAND_CONFIG,
 600                 .help = "the vendor ID and product ID of the USB-Blaster",
 601                 .usage = "vid pid",
 602         },
 603         {
 604                 .name = "usb_blaster",
 605                 .handler = usb_blaster_handle_pin_command,
 606                 .mode = COMMAND_ANY,
 607                 .help = "set pin state for the unused GPIO pins",
 608                 .usage = "(pin6|pin8) (0|1)",
 609         },
 610         COMMAND_REGISTRATION_DONE
 611 };
 612
 613 struct jtag_interface usb_blaster_interface = {
 614         .name = "usb_blaster",
 615         .commands = usb_blaster_command_handlers,
 616         .supported = DEBUG_CAP_TMS_SEQ,
 617
 618         .execute_queue = bitbang_execute_queue,
 619
 620         .speed = usb_blaster_speed,
 621         .init = usb_blaster_init,
 622         .quit = usb_blaster_quit,
 623 };