src/jtag/drivers/amt_jtagaccel.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <jtag/interface.h>
  25
  26 #if PARPORT_USE_PPDEV == 1
  27 #include <linux/parport.h>
  28 #include <linux/ppdev.h>
  29 #include <sys/ioctl.h>
  30 #else /* not PARPORT_USE_PPDEV */
  31 #ifndef _WIN32
  32 #include <sys/io.h>
  33 #endif
  34 #endif
  35
  36 #if PARPORT_USE_GIVEIO == 1
  37 #if IS_CYGWIN == 1
  38 #include <windows.h>
  39 #endif
  40 #endif
  41
  42 /**
  43  * @file
  44  * Support the Amontec Chameleon POD with JTAG Accelerator support.
  45  * This is a parallel port JTAG adapter with a CPLD between the
  46  * parallel port and the JTAG connection.  VHDL code running in the
  47  * CPLD significantly accelerates JTAG operations compared to the
  48  * bitbanging "Wiggler" style of most parallel port adapters.
  49  */
  50
  51 /* configuration */
  52 static uint16_t amt_jtagaccel_port;
  53
  54 /* interface variables
  55  */
  56 static uint8_t aw_control_rst = 0x00;
  57 static uint8_t aw_control_fsm = 0x10;
  58 static uint8_t aw_control_baudrate = 0x20;
  59
  60 static int rtck_enabled = 0;
  61
  62 #if PARPORT_USE_PPDEV == 1
  63 static int device_handle;
  64
  65 static const int addr_mode = IEEE1284_MODE_EPP | IEEE1284_ADDR;
  66
  67 /* FIXME do something sane when these ioctl/read/write calls fail. */
  68
  69 #define AMT_AW(val) \
  70         do { \
  71                 int __retval; \
  72                 \
  73                 __retval = ioctl(device_handle, PPSETMODE, &addr_mode); \
  74                 __retval = write(device_handle, &val, 1); \
  75         } while (0)
  76 #define AMT_AR(val) \
  77         do { \
  78                 int __retval; \
  79                 \
  80                 __retval = ioctl(device_handle, PPSETMODE, &addr_mode); \
  81                 __retval = read(device_handle, &val, 1); \
  82         } while (0)
  83
  84 static const int data_mode = IEEE1284_MODE_EPP | IEEE1284_DATA;
  85
  86 #define AMT_DW(val) \
  87         do { \
  88                 int __retval; \
  89                 \
  90                 __retval = ioctl(device_handle, PPSETMODE, &data_mode); \
  91                 __retval = write(device_handle, &val, 1); \
  92         } while (0)
  93 #define AMT_DR(val) \
  94         do { \
  95                 int __retval; \
  96                 \
  97                 __retval = ioctl(device_handle, PPSETMODE, &data_mode); \
  98                 __retval = read(device_handle, &val, 1); \
  99         } while (0)
 100
 101 #else
 102
 103 #define AMT_AW(val)     do { outb(val, amt_jtagaccel_port + 3); } while (0)
 104 #define AMT_AR(val)     do { val = inb(amt_jtagaccel_port + 3); } while (0)
 105 #define AMT_DW(val)     do { outb(val, amt_jtagaccel_port + 4); } while (0)
 106 #define AMT_DR(val)     do { val = inb(amt_jtagaccel_port + 4); } while (0)
 107
 108 #endif // PARPORT_USE_PPDEV
 109
 110 /* tap_move[i][j]: tap movement command to go from state i to state j
 111  * 0: Test-Logic-Reset
 112  * 1: Run-Test/Idle
 113  * 2: Shift-DR
 114  * 3: Pause-DR
 115  * 4: Shift-IR
 116  * 5: Pause-IR
 117  */
 118 static uint8_t amt_jtagaccel_tap_move[6][6][2] =
 119 {
 120         /*         RESET         IDLE        DRSHIFT       DRPAUSE       IRSHIFT       IRPAUSE             */
 121         {{0x1f, 0x00}, {0x0f, 0x00}, {0x05, 0x00}, {0x0a, 0x00}, {0x06, 0x00}, {0x96, 0x00}},   /* RESET */
 122         {{0x1f, 0x00}, {0x00, 0x00}, {0x04, 0x00}, {0x05, 0x00}, {0x06, 0x00}, {0x0b, 0x00}},   /* IDLE */
 123         {{0x1f, 0x00}, {0x0d, 0x00}, {0x00, 0x00}, {0x01, 0x00}, {0x8f, 0x09}, {0x8f, 0x01}},   /* DRSHIFT  */
 124         {{0x1f, 0x00}, {0x0c, 0x00}, {0x08, 0x00}, {0x00, 0x00}, {0x8f, 0x09}, {0x8f, 0x01}},   /* DRPAUSE  */
 125         {{0x1f, 0x00}, {0x0d, 0x00}, {0x07, 0x00}, {0x97, 0x00}, {0x00, 0x00}, {0x01, 0x00}},   /* IRSHIFT  */
 126         {{0x1f, 0x00}, {0x0c, 0x00}, {0x07, 0x00}, {0x97, 0x00}, {0x08, 0x00}, {0x00, 0x00}},   /* IRPAUSE  */
 127 };
 128
 129
 130 static void amt_jtagaccel_reset(int trst, int srst)
 131 {
 132         if (trst == 1)
 133                 aw_control_rst |= 0x4;
 134         else if (trst == 0)
 135                 aw_control_rst &= ~0x4;
 136
 137         if (srst == 1)
 138                 aw_control_rst |= 0x1;
 139         else if (srst == 0)
 140                 aw_control_rst &= ~0x1;
 141
 142         AMT_AW(aw_control_rst);
 143 }
 144
 145 static int amt_jtagaccel_speed(int speed)
 146 {
 147         aw_control_baudrate &= 0xf0;
 148         aw_control_baudrate |= speed & 0x0f;
 149         AMT_AW(aw_control_baudrate);
 150
 151         return ERROR_OK;
 152 }
 153
 154 static void amt_jtagaccel_end_state(tap_state_t state)
 155 {
 156         if (tap_is_state_stable(state))
 157                 tap_set_end_state(state);
 158         else
 159         {
 160                 LOG_ERROR("BUG: %i is not a valid end state", state);
 161                 exit(-1);
 162         }
 163 }
 164
 165 static void amt_wait_scan_busy(void)
 166 {
 167         int timeout = 4096;
 168         uint8_t ar_status;
 169
 170         AMT_AR(ar_status);
 171         while (((ar_status) & 0x80) && (timeout-- > 0))
 172                 AMT_AR(ar_status);
 173
 174         if (ar_status & 0x80)
 175         {
 176                 LOG_ERROR("amt_jtagaccel timed out while waiting for end of scan, rtck was %s, last AR_STATUS: 0x%2.2x", (rtck_enabled) ? "enabled" : "disabled", ar_status);
 177                 exit(-1);
 178         }
 179 }
 180
 181 static void amt_jtagaccel_state_move(void)
 182 {
 183         uint8_t aw_scan_tms_5;
 184         uint8_t tms_scan[2];
 185
 186         tap_state_t     cur_state = tap_get_state();
 187         tap_state_t     end_state = tap_get_end_state();
 188
 189         tms_scan[0] = amt_jtagaccel_tap_move[tap_move_ndx(cur_state)][tap_move_ndx(end_state)][0];
 190         tms_scan[1] = amt_jtagaccel_tap_move[tap_move_ndx(cur_state)][tap_move_ndx(end_state)][1];
 191
 192         aw_scan_tms_5 = 0x40 | (tms_scan[0] & 0x1f);
 193         AMT_AW(aw_scan_tms_5);
 194         int jtag_speed=0;
 195         int retval = jtag_get_speed(&jtag_speed);
 196         assert(retval == ERROR_OK);
 197         if (jtag_speed > 3 || rtck_enabled)
 198                 amt_wait_scan_busy();
 199
 200         if (tms_scan[0] & 0x80)
 201         {
 202                 aw_scan_tms_5 = 0x40 | (tms_scan[1] & 0x1f);
 203                 AMT_AW(aw_scan_tms_5);
 204                 if (jtag_speed > 3 || rtck_enabled)
 205                         amt_wait_scan_busy();
 206         }
 207
 208         tap_set_state(end_state);
 209 }
 210
 211 static void amt_jtagaccel_runtest(int num_cycles)
 212 {
 213         int i = 0;
 214         uint8_t aw_scan_tms_5;
 215         uint8_t aw_scan_tms_1to4;
 216
 217         tap_state_t saved_end_state = tap_get_end_state();
 218
 219         /* only do a state_move when we're not already in IDLE */
 220         if (tap_get_state() != TAP_IDLE)
 221         {
 222                 amt_jtagaccel_end_state(TAP_IDLE);
 223                 amt_jtagaccel_state_move();
 224         }
 225
 226         while (num_cycles - i >= 5)
 227         {
 228                 aw_scan_tms_5 = 0x40;
 229                 AMT_AW(aw_scan_tms_5);
 230                 i += 5;
 231         }
 232
 233         if (num_cycles - i > 0)
 234         {
 235                 aw_scan_tms_1to4 = 0x80 | ((num_cycles - i - 1) & 0x3) << 4;
 236                 AMT_AW(aw_scan_tms_1to4);
 237         }
 238
 239         amt_jtagaccel_end_state(saved_end_state);
 240         if (tap_get_state() != tap_get_end_state())
 241                 amt_jtagaccel_state_move();
 242 }
 243
 244 static void amt_jtagaccel_scan(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size)
 245 {
 246         int bits_left = scan_size;
 247         int bit_count = 0;
 248         tap_state_t saved_end_state = tap_get_end_state();
 249         uint8_t aw_tdi_option;
 250         uint8_t dw_tdi_scan;
 251         uint8_t dr_tdo;
 252         uint8_t aw_tms_scan;
 253         uint8_t tms_scan[2];
 254         int jtag_speed_var;
 255         int retval = jtag_get_speed(&jtag_speed_var);
 256         assert(retval == ERROR_OK);
 257
 258         if (ir_scan)
 259                 amt_jtagaccel_end_state(TAP_IRSHIFT);
 260         else
 261                 amt_jtagaccel_end_state(TAP_DRSHIFT);
 262
 263         amt_jtagaccel_state_move();
 264         amt_jtagaccel_end_state(saved_end_state);
 265
 266         /* handle unaligned bits at the beginning */
 267         if ((scan_size - 1) % 8)
 268         {
 269                 aw_tdi_option = 0x30 | (((scan_size - 1) % 8) - 1);
 270                 AMT_AW(aw_tdi_option);
 271
 272                 dw_tdi_scan = buf_get_u32(buffer, bit_count, (scan_size - 1) % 8) & 0xff;
 273                 AMT_DW(dw_tdi_scan);
 274                 if (jtag_speed_var > 3 || rtck_enabled)
 275                         amt_wait_scan_busy();
 276
 277                 if ((type == SCAN_IN) || (type == SCAN_IO))
 278                 {
 279                         AMT_DR(dr_tdo);
 280                         dr_tdo = dr_tdo >> (8 - ((scan_size - 1) % 8));
 281                         buf_set_u32(buffer, bit_count, (scan_size - 1) % 8, dr_tdo);
 282                 }
 283
 284                 bit_count += (scan_size - 1) % 8;
 285                 bits_left -= (scan_size - 1) % 8;
 286         }
 287
 288         while (bits_left - 1 >= 8)
 289         {
 290                 dw_tdi_scan = buf_get_u32(buffer, bit_count, 8) & 0xff;
 291                 AMT_DW(dw_tdi_scan);
 292                 if (jtag_speed_var > 3 || rtck_enabled)
 293                         amt_wait_scan_busy();
 294
 295                 if ((type == SCAN_IN) || (type == SCAN_IO))
 296                 {
 297                         AMT_DR(dr_tdo);
 298                         buf_set_u32(buffer, bit_count, 8, dr_tdo);
 299                 }
 300
 301                 bit_count += 8;
 302                 bits_left -= 8;
 303         }
 304
 305         tms_scan[0] = amt_jtagaccel_tap_move[tap_move_ndx(tap_get_state())][tap_move_ndx(tap_get_end_state())][0];
 306         tms_scan[1] = amt_jtagaccel_tap_move[tap_move_ndx(tap_get_state())][tap_move_ndx(tap_get_end_state())][1];
 307         aw_tms_scan = 0x40 | (tms_scan[0] & 0x1f) | (buf_get_u32(buffer, bit_count, 1) << 5);
 308         AMT_AW(aw_tms_scan);
 309         if (jtag_speed_var > 3 || rtck_enabled)
 310                 amt_wait_scan_busy();
 311
 312         if ((type == SCAN_IN) || (type == SCAN_IO))
 313         {
 314                 AMT_DR(dr_tdo);
 315                 dr_tdo = dr_tdo >> 7;
 316                 buf_set_u32(buffer, bit_count, 1, dr_tdo);
 317         }
 318
 319         if (tms_scan[0] & 0x80)
 320         {
 321                 aw_tms_scan = 0x40 | (tms_scan[1] & 0x1f);
 322                 AMT_AW(aw_tms_scan);
 323                 if (jtag_speed_var > 3 || rtck_enabled)
 324                         amt_wait_scan_busy();
 325         }
 326         tap_set_state(tap_get_end_state());
 327 }
 328
 329 static int amt_jtagaccel_execute_queue(void)
 330 {
 331         struct jtag_command *cmd = jtag_command_queue; /* currently processed command */
 332         int scan_size;
 333         enum scan_type type;
 334         uint8_t *buffer;
 335         int retval;
 336
 337         /* return ERROR_OK, unless a jtag_read_buffer returns a failed check
 338          * that wasn't handled by a caller-provided error handler
 339          */
 340         retval = ERROR_OK;
 341
 342         while (cmd)
 343         {
 344                 switch (cmd->type)
 345                 {
 346                         case JTAG_RESET:
 347 #ifdef _DEBUG_JTAG_IO_
 348                                 LOG_DEBUG("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 349 #endif
 350                                 if (cmd->cmd.reset->trst == 1)
 351                                 {
 352                                         tap_set_state(TAP_RESET);
 353                                 }
 354                                 amt_jtagaccel_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 355                                 break;
 356                         case JTAG_RUNTEST:
 357 #ifdef _DEBUG_JTAG_IO_
 358                                 LOG_DEBUG("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles, cmd->cmd.runtest->end_state);
 359 #endif
 360                                 amt_jtagaccel_end_state(cmd->cmd.runtest->end_state);
 361                                 amt_jtagaccel_runtest(cmd->cmd.runtest->num_cycles);
 362                                 break;
 363                         case JTAG_TLR_RESET:
 364 #ifdef _DEBUG_JTAG_IO_
 365                                 LOG_DEBUG("statemove end in %i", cmd->cmd.statemove->end_state);
 366 #endif
 367                                 amt_jtagaccel_end_state(cmd->cmd.statemove->end_state);
 368                                 amt_jtagaccel_state_move();
 369                                 break;
 370                         case JTAG_SCAN:
 371 #ifdef _DEBUG_JTAG_IO_
 372                                 LOG_DEBUG("scan end in %i", cmd->cmd.scan->end_state);
 373 #endif
 374                                 amt_jtagaccel_end_state(cmd->cmd.scan->end_state);
 375                                 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
 376                                 type = jtag_scan_type(cmd->cmd.scan);
 377                                 amt_jtagaccel_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size);
 378                                 if (jtag_read_buffer(buffer, cmd->cmd.scan) != ERROR_OK)
 379                                         retval = ERROR_JTAG_QUEUE_FAILED;
 380                                 if (buffer)
 381                                         free(buffer);
 382                                 break;
 383                         case JTAG_SLEEP:
 384 #ifdef _DEBUG_JTAG_IO_
 385                                 LOG_DEBUG("sleep %" PRIi32, cmd->cmd.sleep->us);
 386 #endif
 387                                 jtag_sleep(cmd->cmd.sleep->us);
 388                                 break;
 389                         default:
 390                                 LOG_ERROR("BUG: unknown JTAG command type encountered");
 391                                 exit(-1);
 392                 }
 393                 cmd = cmd->next;
 394         }
 395
 396         return retval;
 397 }
 398
 399 #if PARPORT_USE_GIVEIO == 1
 400 int amt_jtagaccel_get_giveio_access(void)
 401 {
 402         HANDLE h;
 403         OSVERSIONINFO version;
 404
 405         version.dwOSVersionInfoSize = sizeof version;
 406         if (!GetVersionEx(&version)) {
 407         errno = EINVAL;
 408         return -1;
 409         }
 410         if (version.dwPlatformId != VER_PLATFORM_WIN32_NT)
 411         return 0;
 412
 413         h = CreateFile("\\\\.\\giveio", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
 414         if (h == INVALID_HANDLE_VALUE) {
 415         errno = ENODEV;
 416         return -1;
 417         }
 418
 419         CloseHandle(h);
 420
 421         return 0;
 422 }
 423 #endif
 424
 425 static int amt_jtagaccel_init(void)
 426 {
 427 #if PARPORT_USE_PPDEV == 1
 428         char buffer[256];
 429         int i = 0;
 430         uint8_t control_port;
 431 #else
 432         uint8_t status_port;
 433 #endif
 434         uint8_t ar_status;
 435
 436 #if PARPORT_USE_PPDEV == 1
 437         if (device_handle > 0)
 438         {
 439                 LOG_ERROR("device is already opened");
 440                 return ERROR_JTAG_INIT_FAILED;
 441         }
 442
 443         snprintf(buffer, 256, "/dev/parport%d", amt_jtagaccel_port);
 444         device_handle = open(buffer, O_RDWR);
 445
 446         if (device_handle < 0)
 447         {
 448                 LOG_ERROR("cannot open device. check it exists and that user read and write rights are set");
 449                 return ERROR_JTAG_INIT_FAILED;
 450         }
 451
 452         i = ioctl(device_handle, PPCLAIM);
 453         if (i < 0)
 454         {
 455                 LOG_ERROR("cannot claim device");
 456                 return ERROR_JTAG_INIT_FAILED;
 457         }
 458
 459         i = IEEE1284_MODE_EPP;
 460         i = ioctl(device_handle, PPSETMODE, & i);
 461         if (i < 0)
 462         {
 463                 LOG_ERROR(" cannot set compatible mode to device");
 464                 return ERROR_JTAG_INIT_FAILED;
 465         }
 466
 467         control_port = 0x00;
 468         i = ioctl(device_handle, PPWCONTROL, &control_port);
 469
 470         control_port = 0x04;
 471         i = ioctl(device_handle, PPWCONTROL, &control_port);
 472
 473 #else
 474         if (amt_jtagaccel_port == 0)
 475         {
 476                 amt_jtagaccel_port = 0x378;
 477                 LOG_WARNING("No parport port specified, using default '0x378' (LPT1)");
 478         }
 479
 480 #if PARPORT_USE_GIVEIO == 1
 481         if (amt_jtagaccel_get_giveio_access() != 0) {
 482 #else /* PARPORT_USE_GIVEIO */
 483         if (ioperm(amt_jtagaccel_port, 5, 1) != 0) {
 484 #endif /* PARPORT_USE_GIVEIO */
 485                 LOG_ERROR("missing privileges for direct i/o");
 486                 return ERROR_JTAG_INIT_FAILED;
 487         }
 488
 489         /* prepare epp port */
 490         /* clear timeout */
 491         status_port = inb(amt_jtagaccel_port + 1);
 492         outb(status_port | 0x1, amt_jtagaccel_port + 1);
 493
 494         /* reset epp port */
 495         outb(0x00, amt_jtagaccel_port + 2);
 496         outb(0x04, amt_jtagaccel_port + 2);
 497 #endif
 498
 499         if (rtck_enabled)
 500         {
 501                 /* set RTCK enable bit */
 502                 aw_control_fsm |= 0x02;
 503         }
 504
 505         /* enable JTAG port */
 506         aw_control_fsm |= 0x04;
 507         AMT_AW(aw_control_fsm);
 508
 509         enum reset_types jtag_reset_config = jtag_get_reset_config();
 510         if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
 511                 aw_control_rst &= ~0x8;
 512         else
 513                 aw_control_rst |= 0x8;
 514
 515         if (jtag_reset_config & RESET_SRST_PUSH_PULL)
 516                 aw_control_rst &= ~0x2;
 517         else
 518                 aw_control_rst |= 0x2;
 519
 520         amt_jtagaccel_reset(0, 0);
 521
 522         /* read status register */
 523         AMT_AR(ar_status);
 524         LOG_DEBUG("AR_STATUS: 0x%2.2x", ar_status);
 525
 526         return ERROR_OK;
 527 }
 528
 529 static int amt_jtagaccel_quit(void)
 530 {
 531
 532         return ERROR_OK;
 533 }
 534
 535 COMMAND_HANDLER(amt_jtagaccel_handle_parport_port_command)
 536 {
 537         if (CMD_ARGC == 1)
 538         {
 539                 /* only if the port wasn't overwritten by cmdline */
 540                 if (amt_jtagaccel_port == 0)
 541                 {
 542                         uint16_t port;
 543                         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], port);
 544                         amt_jtagaccel_port = port;
 545                 }
 546                 else
 547                 {
 548                         LOG_ERROR("The parport port was already configured!");
 549                         return ERROR_FAIL;
 550                 }
 551         }
 552
 553         command_print(CMD_CTX, "parport port = %u", amt_jtagaccel_port);
 554
 555         return ERROR_OK;
 556 }
 557
 558 COMMAND_HANDLER(amt_jtagaccel_handle_rtck_command)
 559 {
 560         if (CMD_ARGC == 0)
 561         {
 562                 command_print(CMD_CTX, "amt_jtagaccel RTCK feature %s", (rtck_enabled) ? "enabled" : "disabled");
 563                 return ERROR_OK;
 564         }
 565         else
 566         {
 567                 if (strcmp(CMD_ARGV[0], "enabled") == 0)
 568                 {
 569                         rtck_enabled = 1;
 570                 }
 571                 else
 572                 {
 573                         rtck_enabled = 0;
 574                 }
 575         }
 576
 577         return ERROR_OK;
 578 }
 579
 580 static const struct command_registration amtjtagaccel_command_handlers[] = {
 581         {
 582                 .name = "parport_port",
 583                 .handler = &amt_jtagaccel_handle_parport_port_command,
 584                 .mode = COMMAND_CONFIG,
 585                 .help = "configure or display the parallel port to use",
 586                 .usage = "[port_num]",
 587         },
 588         {
 589                 /**
 590                  * @todo Remove this "rtck" command; just use the standard
 591                  * mechanism to enable/disable adaptive clocking.  First
 592                  * implement the standard mechanism and deprecate "rtck";
 593                  * after a year or so, it'll be safe to remove this.
 594                  */
 595                 .name = "rtck",
 596                 .handler = &amt_jtagaccel_handle_rtck_command,
 597                 .mode = COMMAND_CONFIG,
 598                 .help = "configure or display RTCK support",
 599                 .usage = "[enable|disable]",
 600         },
 601         COMMAND_REGISTRATION_DONE
 602 };
 603
 604 struct jtag_interface amt_jtagaccel_interface = {
 605         .name = "amt_jtagaccel",
 606         .commands = amtjtagaccel_command_handlers,
 607
 608         .init = amt_jtagaccel_init,
 609         .quit = amt_jtagaccel_quit,
 610         .speed = amt_jtagaccel_speed,
 611         .execute_queue = amt_jtagaccel_execute_queue,
 612 };