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 #include "ftd2xx_common.h"
 101 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 102 #include <ftdi.h>
 103 #endif
 104
 105 #include <sys/time.h>
 106 #include <time.h>
 107
 108 static char *usb_blaster_device_desc;
 109 static uint16_t usb_blaster_vid = 0x09fb;       /* Altera */
 110 static uint16_t usb_blaster_pid = 0x6001;       /* USB-Blaster */
 111
 112 /* last output byte in simple bit banging (legacy) mode */
 113 static uint8_t out_value;
 114 /* global output buffer for bit banging */
 115 #define BUF_LEN 64      /* Size of EP1 */
 116 static uint8_t out_buffer[BUF_LEN];
 117 static uint16_t out_count;
 118
 119 #if BUILD_USB_BLASTER_FTD2XX == 1
 120 static FT_HANDLE ftdih;
 121 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 122 static struct ftdi_context ftdic;
 123 #endif
 124
 125 static int usb_blaster_buf_write(
 126         uint8_t *buf, int size, uint32_t *bytes_written)
 127 {
 128 #if BUILD_USB_BLASTER_FTD2XX == 1
 129         FT_STATUS status;
 130         DWORD dw_bytes_written;
 131
 132 #ifdef _DEBUG_JTAG_IO_
 133         LOG_DEBUG("usb_blaster_buf_write %02X (%d)", buf[0], size);
 134 #endif
 135         status = FT_Write(ftdih, buf, size, &dw_bytes_written);
 136         if (status != FT_OK) {
 137                 *bytes_written = dw_bytes_written;
 138                 LOG_ERROR("FT_Write returned: %s", ftd2xx_status_string(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                 *bytes_written = 0;
 151                 LOG_ERROR("ftdi_write_data: %s", ftdi_get_error_string(&ftdic));
 152                 return ERROR_JTAG_DEVICE_ERROR;
 153         }
 154         *bytes_written = retval;
 155         return ERROR_OK;
 156 #endif
 157 }
 158
 159 static int usb_blaster_buf_read(uint8_t *buf, unsigned size, uint32_t *bytes_read)
 160 {
 161 #if BUILD_USB_BLASTER_FTD2XX == 1
 162         DWORD dw_bytes_read;
 163         FT_STATUS status;
 164
 165         status = FT_Read(ftdih, buf, size, &dw_bytes_read);
 166         if (status != FT_OK) {
 167                 *bytes_read = dw_bytes_read;
 168                 LOG_ERROR("FT_Read returned: %s", ftd2xx_status_string(status));
 169                 return ERROR_JTAG_DEVICE_ERROR;
 170         }
 171 #ifdef _DEBUG_JTAG_IO_
 172         LOG_DEBUG("usb_blaster_buf_read %02X (%" PRIu32 ")", buf[0], dw_bytes_read);
 173 #endif
 174         *bytes_read = dw_bytes_read;
 175         return ERROR_OK;
 176
 177 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 178         int retval;
 179         int timeout = 100;
 180
 181         *bytes_read = 0;
 182         while ((*bytes_read < size) && timeout--) {
 183                 retval = ftdi_read_data(&ftdic, buf + *bytes_read,
 184                                 size - *bytes_read);
 185                 if (retval < 0) {
 186                         *bytes_read = 0;
 187                         LOG_ERROR("ftdi_read_data: %s",
 188                                 ftdi_get_error_string(&ftdic));
 189                         return ERROR_JTAG_DEVICE_ERROR;
 190                 }
 191                 *bytes_read += retval;
 192         }
 193 #ifdef _DEBUG_JTAG_IO_
 194         LOG_DEBUG("usb_blaster_buf_read %02X (%d)", buf[0], *bytes_read);
 195 #endif
 196         return ERROR_OK;
 197 #endif
 198 }
 199
 200 /* The following code doesn't fully utilize the possibilities of the
 201  * USB-Blaster. It only buffers data up to the maximum packet size of 64 bytes.
 202  *
 203  * Actually, the USB-Blaster offers a byte-shift mode to transmit up to 504 data
 204  * bits (bidirectional) in a single USB packet. A header byte has to be sent as
 205  * the first byte in a packet with the following meaning:
 206  *
 207  *   Bit 7 (0x80): Must be set to indicate byte-shift mode.
 208  *   Bit 6 (0x40): If set, the USB-Blaster will also read data, not just write.
 209  *   Bit 5..0:     Define the number N of following bytes
 210  *
 211  * All N following bytes will then be clocked out serially on TDI. If Bit 6 was
 212  * set, it will afterwards return N bytes with TDO data read while clocking out
 213  * the TDI data. LSB of the first byte after the header byte will appear first
 214  * on TDI.
 215  */
 216
 217 /* Simple bit banging mode:
 218  *
 219  *   Bit 7 (0x80): Must be zero (see byte-shift mode above)
 220  *   Bit 6 (0x40): If set, you will receive a byte indicating the state of TDO
 221  *                 in return.
 222  *   Bit 5 (0x20): Output Enable/LED.
 223  *   Bit 4 (0x10): TDI Output.
 224  *   Bit 3 (0x08): nCS Output (not used in JTAG mode).
 225  *   Bit 2 (0x04): nCE Output (not used in JTAG mode).
 226  *   Bit 1 (0x02): TMS Output.
 227  *   Bit 0 (0x01): TCK Output.
 228  *
 229  * For transmitting a single data bit, you need to write two bytes. Up to 64
 230  * bytes can be combined in a single USB packet.
 231  * It isn't possible to read a data without transmitting data.
 232  */
 233
 234 #define TCK                     (1 << 0)
 235 #define TMS                     (1 << 1)
 236 #define NCE                     (1 << 2)
 237 #define NCS                     (1 << 3)
 238 #define TDI                     (1 << 4)
 239 #define LED                     (1 << 5)
 240 #define READ            (1 << 6)
 241 #define SHMODE          (1 << 7)
 242 #define OTHERS          ((1 << 2) | (1 << 3) | (1 << 5))
 243
 244 #define READ_TDO        (1 << 0)
 245
 246 static void usb_blaster_write_databuffer(uint8_t *buf, uint16_t len)
 247 {
 248         uint32_t bytes_written;
 249         usb_blaster_buf_write(buf, len, &bytes_written);
 250         out_count = 0;
 251 #ifdef _DEBUG_JTAG_IO_
 252         LOG_DEBUG("---- WROTE %d", bytes_written);
 253 #endif
 254 }
 255
 256 static void usb_blaster_addtowritebuffer(uint8_t value, bool forcewrite)
 257 {
 258         out_buffer[out_count] = value;
 259         out_count += 1;
 260         if (out_count == BUF_LEN || forcewrite)
 261                 usb_blaster_write_databuffer(out_buffer, out_count);
 262 }
 263
 264 static int usb_blaster_read_data(void)
 265 {
 266         int status;
 267         uint8_t buf[1];
 268         uint32_t bytes_read;
 269
 270         if (out_count > 0)
 271                 usb_blaster_write_databuffer(out_buffer, out_count);
 272
 273         out_value |= READ;
 274         usb_blaster_addtowritebuffer(out_value, true);
 275         out_value &= ~READ;
 276
 277         status = usb_blaster_buf_read(buf, 1, &bytes_read);
 278         if (status < 0)
 279                 return 0;
 280
 281         return !!(buf[0] & READ_TDO);
 282 }
 283
 284 static void usb_blaster_write(int tck, int tms, int tdi)
 285 {
 286 #ifdef _DEBUG_JTAG_IO_
 287         LOG_DEBUG("---- usb_blaster_write(%d,%d,%d)", tck, tms, tdi);
 288 #endif
 289         out_value &= ~(TCK | TMS | TDI);
 290         if (tck)
 291                 out_value |= TCK;
 292         if (tms)
 293                 out_value |= TMS;
 294         if (tdi)
 295                 out_value |= TDI;
 296
 297         usb_blaster_addtowritebuffer(out_value, false);
 298 }
 299
 300 static int usb_blaster_speed(int speed)
 301 {
 302 #if BUILD_USB_BLASTER_FTD2XX == 1
 303         LOG_DEBUG("TODO: usb_blaster_speed() isn't implemented for libftd2xx!");
 304 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 305         LOG_DEBUG("TODO: usb_blaster_speed() isn't optimally implemented!");
 306
 307         /* TODO: libftdi's ftdi_set_baudrate chokes on high rates, use lowlevel
 308          * usb function instead! And additionally allow user to throttle.
 309          */
 310         if (ftdi_set_baudrate(&ftdic, 3000000 / 4) < 0) {
 311                 LOG_ERROR("Can't set baud rate to max: %s",
 312                         ftdi_get_error_string(&ftdic));
 313                 return ERROR_JTAG_DEVICE_ERROR;
 314         }
 315         ;
 316 #endif
 317
 318         return ERROR_OK;
 319 }
 320
 321 static void usb_blaster_reset(int trst, int srst)
 322 {
 323         LOG_DEBUG("TODO: usb_blaster_reset(%d,%d) isn't implemented!",
 324                 trst, srst);
 325 }
 326
 327 static void usb_blaster_blink(int state)
 328 {
 329         out_value = 0x00;
 330         if (state)
 331                 out_value |= LED;
 332
 333         usb_blaster_addtowritebuffer(out_value, true);
 334 }
 335
 336 static struct bitbang_interface usb_blaster_bitbang = {
 337         .read = usb_blaster_read_data,
 338         .write = usb_blaster_write,
 339         .reset = usb_blaster_reset,
 340         .blink = usb_blaster_blink,
 341 };
 342
 343 static int usb_blaster_init(void)
 344 {
 345         uint8_t latency_timer;
 346
 347 #if BUILD_USB_BLASTER_FTD2XX == 1
 348         FT_STATUS status;
 349 #endif
 350
 351 #if BUILD_USB_BLASTER_FTD2XX == 1
 352         LOG_DEBUG("'usb_blaster' interface using FTD2XX");
 353 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 354         LOG_DEBUG("'usb_blaster' interface using libftdi");
 355 #endif
 356
 357 #if BUILD_USB_BLASTER_FTD2XX == 1
 358         /* Open by device description */
 359         if (usb_blaster_device_desc == NULL) {
 360                 LOG_WARNING("no usb_blaster device description specified, "
 361                         "using default 'USB-Blaster'");
 362                 usb_blaster_device_desc = "USB-Blaster";
 363         }
 364
 365 #if IS_WIN32 == 0
 366         /* Add non-standard Vid/Pid to the linux driver */
 367         status = FT_SetVIDPID(usb_blaster_vid, usb_blaster_pid);
 368         if (status != FT_OK) {
 369                 LOG_WARNING("couldn't add %4.4x:%4.4x",
 370                         usb_blaster_vid, usb_blaster_pid);
 371         }
 372 #endif
 373
 374         status = FT_OpenEx(usb_blaster_device_desc, FT_OPEN_BY_DESCRIPTION,
 375                         &ftdih);
 376         if (status != FT_OK) {
 377                 DWORD num_devices;
 378
 379                 LOG_ERROR("unable to open ftdi device: %s",
 380                         ftd2xx_status_string(status));
 381                 status = FT_ListDevices(&num_devices, NULL,
 382                                 FT_LIST_NUMBER_ONLY);
 383                 if (status == FT_OK) {
 384                         char **desc_array = malloc(sizeof(char *)
 385                                         * (num_devices + 1));
 386                         unsigned int i;
 387
 388                         for (i = 0; i < num_devices; i++)
 389                                 desc_array[i] = malloc(64);
 390                         desc_array[num_devices] = NULL;
 391
 392                         status = FT_ListDevices(desc_array, &num_devices,
 393                                         FT_LIST_ALL | FT_OPEN_BY_DESCRIPTION);
 394
 395                         if (status == FT_OK) {
 396                                 LOG_ERROR("ListDevices: %" PRIu32, (uint32_t)num_devices);
 397                                 for (i = 0; i < num_devices; i++)
 398                                         LOG_ERROR("%i: %s", i, desc_array[i]);
 399                         }
 400
 401                         for (i = 0; i < num_devices; i++)
 402                                 free(desc_array[i]);
 403                         free(desc_array);
 404                 } else
 405                         printf("ListDevices: NONE\n");
 406                 return ERROR_JTAG_INIT_FAILED;
 407         }
 408
 409         status = FT_SetLatencyTimer(ftdih, 2);
 410         if (status != FT_OK) {
 411                 LOG_ERROR("unable to set latency timer: %s",
 412                         ftd2xx_status_string(status));
 413                 return ERROR_JTAG_INIT_FAILED;
 414         }
 415
 416         status = FT_GetLatencyTimer(ftdih, &latency_timer);
 417         if (status != FT_OK) {
 418                 LOG_ERROR("unable to get latency timer: %s",
 419                         ftd2xx_status_string(status));
 420                 return ERROR_JTAG_INIT_FAILED;
 421         }
 422         LOG_DEBUG("current latency timer: %i", latency_timer);
 423
 424         status = FT_SetBitMode(ftdih, 0x00, 0);
 425         if (status != FT_OK) {
 426                 LOG_ERROR("unable to disable bit i/o mode: %s",
 427                         ftd2xx_status_string(status));
 428                 return ERROR_JTAG_INIT_FAILED;
 429         }
 430 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 431         if (ftdi_init(&ftdic) < 0)
 432                 return ERROR_JTAG_INIT_FAILED;
 433
 434         /* context, vendor id, product id */
 435         if (ftdi_usb_open(&ftdic, usb_blaster_vid, usb_blaster_pid) < 0) {
 436                 LOG_ERROR("unable to open ftdi device: %s", ftdic.error_str);
 437                 return ERROR_JTAG_INIT_FAILED;
 438         }
 439
 440         if (ftdi_usb_reset(&ftdic) < 0) {
 441                 LOG_ERROR("unable to reset ftdi device");
 442                 return ERROR_JTAG_INIT_FAILED;
 443         }
 444
 445         if (ftdi_set_latency_timer(&ftdic, 2) < 0) {
 446                 LOG_ERROR("unable to set latency timer");
 447                 return ERROR_JTAG_INIT_FAILED;
 448         }
 449
 450         if (ftdi_get_latency_timer(&ftdic, &latency_timer) < 0) {
 451                 LOG_ERROR("unable to get latency timer");
 452                 return ERROR_JTAG_INIT_FAILED;
 453         }
 454         LOG_DEBUG("current latency timer: %u", latency_timer);
 455
 456         ftdi_disable_bitbang(&ftdic);
 457 #endif
 458
 459         bitbang_interface = &usb_blaster_bitbang;
 460
 461 #if 0
 462 #if BUILD_USB_BLASTER_FTD2XX == 1
 463         status = FT_Purge(ftdih, FT_PURGE_RX | FT_PURGE_TX);
 464         if (status != FT_OK) {
 465                 LOG_ERROR("error purging ftd2xx device: %i", status);
 466                 return ERROR_JTAG_INIT_FAILED;
 467         }
 468 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 469         if (ftdi_usb_purge_buffers(&ftdic) < 0) {
 470                 LOG_ERROR("ftdi_purge_buffers: %s", ftdic.error_str);
 471                 return ERROR_JTAG_INIT_FAILED;
 472         }
 473 #endif
 474 #endif
 475
 476         return ERROR_OK;
 477 }
 478
 479 static int usb_blaster_quit(void)
 480 {
 481         if (out_count > 0)
 482                 usb_blaster_write_databuffer(out_buffer, out_count);
 483
 484 #if BUILD_USB_BLASTER_FTD2XX == 1
 485         FT_STATUS status;
 486
 487         status = FT_Close(ftdih);
 488 #elif BUILD_USB_BLASTER_LIBFTDI == 1
 489         ftdi_usb_close(&ftdic);
 490         ftdi_deinit(&ftdic);
 491 #endif
 492
 493         return ERROR_OK;
 494 }
 495
 496 COMMAND_HANDLER(usb_blaster_handle_device_desc_command)
 497 {
 498         if (CMD_ARGC == 1)
 499                 usb_blaster_device_desc = strdup(CMD_ARGV[0]);
 500         else
 501                 LOG_ERROR("require exactly one argument to "
 502                         "usb_blaster_device_desc <description>");
 503
 504         return ERROR_OK;
 505 }
 506
 507 COMMAND_HANDLER(usb_blaster_handle_vid_pid_command)
 508 {
 509         if (CMD_ARGC > 2) {
 510                 LOG_WARNING("ignoring extra IDs in usb_blaster_vid_pid "
 511                         "(maximum is 1 pair)");
 512                 CMD_ARGC = 2;
 513         }
 514         if (CMD_ARGC == 2) {
 515                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], usb_blaster_vid);
 516                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[1], usb_blaster_pid);
 517         } else
 518                 LOG_WARNING("incomplete usb_blaster_vid_pid configuration");
 519
 520         return ERROR_OK;
 521 }
 522
 523 COMMAND_HANDLER(usb_blaster_handle_pin_command)
 524 {
 525         if (CMD_ARGC == 2) {
 526                 const char *const pin_name = CMD_ARGV[0];
 527                 uint8_t mask;
 528                 unsigned int state;
 529
 530                 if (!strcmp(pin_name, "pin6"))
 531                         mask = NCE;
 532                 else if (!strcmp(pin_name, "pin8"))
 533                         mask = NCS;
 534                 else {
 535                         LOG_ERROR("%s: pin name must be \"pin6\" or \"pin8\"",
 536                                 CMD_NAME);
 537                         return ERROR_COMMAND_SYNTAX_ERROR;
 538                 }
 539
 540                 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[1], state);
 541                 if (state == 0) {
 542                         out_value &= ~mask;
 543                         usb_blaster_addtowritebuffer(out_value, true);
 544                 } else if (state == 1)   {
 545                         out_value |= mask;
 546                         usb_blaster_addtowritebuffer(out_value, true);
 547                 } else {
 548                         LOG_ERROR("%s: pin state must be 0 or 1", CMD_NAME);
 549                         return ERROR_COMMAND_SYNTAX_ERROR;
 550                 }
 551
 552                 return ERROR_OK;
 553         } else {
 554                 LOG_ERROR("%s takes exactly two arguments", CMD_NAME);
 555                 return ERROR_COMMAND_SYNTAX_ERROR;
 556         }
 557 }
 558
 559 static const struct command_registration usb_blaster_command_handlers[] = {
 560         {
 561                 .name = "usb_blaster_device_desc",
 562                 .handler = usb_blaster_handle_device_desc_command,
 563                 .mode = COMMAND_CONFIG,
 564                 .help = "set the USB device description of the USB-Blaster",
 565                 .usage = "description-string",
 566         },
 567         {
 568                 .name = "usb_blaster_vid_pid",
 569                 .handler = usb_blaster_handle_vid_pid_command,
 570                 .mode = COMMAND_CONFIG,
 571                 .help = "the vendor ID and product ID of the USB-Blaster",
 572                 .usage = "vid pid",
 573         },
 574         {
 575                 .name = "usb_blaster",
 576                 .handler = usb_blaster_handle_pin_command,
 577                 .mode = COMMAND_ANY,
 578                 .help = "set pin state for the unused GPIO pins",
 579                 .usage = "(pin6|pin8) (0|1)",
 580         },
 581         COMMAND_REGISTRATION_DONE
 582 };
 583
 584 struct jtag_interface usb_blaster_interface = {
 585         .name = "usb_blaster",
 586         .commands = usb_blaster_command_handlers,
 587         .supported = DEBUG_CAP_TMS_SEQ,
 588
 589         .execute_queue = bitbang_execute_queue,
 590
 591         .speed = usb_blaster_speed,
 592         .init = usb_blaster_init,
 593         .quit = usb_blaster_quit,
 594 };