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