git.sur5r.net Git - openocd/blob - src/jtag/zy1000/zy1000.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007-2008 by Øyvind Harboe                              *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  18  ***************************************************************************/
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22
  23 #include "embeddedice.h"
  24 #include "minidriver.h"
  25 #include "interface.h"
  26
  27 #include <cyg/hal/hal_io.h>             // low level i/o
  28 #include <cyg/hal/hal_diag.h>
  29
  30
  31 #define ZYLIN_VERSION "1.52"
  32 #define ZYLIN_DATE __DATE__
  33 #define ZYLIN_TIME __TIME__
  34 #define ZYLIN_OPENOCD "$Revision$"
  35 #define ZYLIN_OPENOCD_VERSION "Zylin JTAG ZY1000 " ZYLIN_VERSION " " ZYLIN_DATE " " ZYLIN_TIME
  36
  37 /* low level command set
  38  */
  39 void zy1000_reset(int trst, int srst);
  40
  41
  42 int zy1000_speed(int speed);
  43 int zy1000_register_commands(struct command_context_s *cmd_ctx);
  44 int zy1000_init(void);
  45 int zy1000_quit(void);
  46
  47 /* interface commands */
  48 int zy1000_handle_zy1000_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  49
  50 static int zy1000_khz(int khz, int *jtag_speed)
  51 {
  52         if (khz == 0)
  53         {
  54                 *jtag_speed = 0;
  55         }
  56         else
  57         {
  58                 *jtag_speed = 64000/khz;
  59         }
  60         return ERROR_OK;
  61 }
  62
  63 static int zy1000_speed_div(int speed, int *khz)
  64 {
  65         if (speed == 0)
  66         {
  67                 *khz = 0;
  68         }
  69         else
  70         {
  71                 *khz = 64000/speed;
  72         }
  73
  74         return ERROR_OK;
  75 }
  76
  77 static bool readPowerDropout(void)
  78 {
  79         cyg_uint32 state;
  80         // sample and clear power dropout
  81         HAL_WRITE_UINT32(ZY1000_JTAG_BASE + 0x10, 0x80);
  82         HAL_READ_UINT32(ZY1000_JTAG_BASE + 0x10, state);
  83         bool powerDropout;
  84         powerDropout = (state & 0x80) != 0;
  85         return powerDropout;
  86 }
  87
  88
  89 static bool readSRST(void)
  90 {
  91         cyg_uint32 state;
  92         // sample and clear SRST sensing
  93         HAL_WRITE_UINT32(ZY1000_JTAG_BASE + 0x10, 0x00000040);
  94         HAL_READ_UINT32(ZY1000_JTAG_BASE + 0x10, state);
  95         bool srstAsserted;
  96         srstAsserted = (state & 0x40) != 0;
  97         return srstAsserted;
  98 }
  99
 100 static int zy1000_srst_asserted(int *srst_asserted)
 101 {
 102         *srst_asserted = readSRST();
 103         return ERROR_OK;
 104 }
 105
 106 static int zy1000_power_dropout(int *dropout)
 107 {
 108         *dropout = readPowerDropout();
 109         return ERROR_OK;
 110 }
 111
 112
 113 jtag_interface_t zy1000_interface =
 114 {
 115         .name = "ZY1000",
 116         .execute_queue = NULL,
 117         .speed = zy1000_speed,
 118         .register_commands = zy1000_register_commands,
 119         .init = zy1000_init,
 120         .quit = zy1000_quit,
 121         .khz = zy1000_khz,
 122         .speed_div = zy1000_speed_div,
 123         .power_dropout = zy1000_power_dropout,
 124         .srst_asserted = zy1000_srst_asserted,
 125 };
 126
 127 void zy1000_reset(int trst, int srst)
 128 {
 129         LOG_DEBUG("zy1000 trst=%d, srst=%d", trst, srst);
 130         if (!srst)
 131         {
 132                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x14, 0x00000001);
 133         }
 134         else
 135         {
 136                 /* Danger!!! if clk != 0 when in
 137                  * idle in TAP_IDLE, reset halt on str912 will fail.
 138                  */
 139                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x10, 0x00000001);
 140         }
 141
 142         if (!trst)
 143         {
 144                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x14, 0x00000002);
 145         }
 146         else
 147         {
 148                 /* assert reset */
 149                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x10, 0x00000002);
 150         }
 151
 152         if (trst||(srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
 153         {
 154                 waitIdle();
 155                 /* we're now in the RESET state until trst is deasserted */
 156                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, TAP_RESET);
 157         } else
 158         {
 159                 /* We'll get RCLK failure when we assert TRST, so clear any false positives here */
 160                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x14, 0x400);
 161         }
 162
 163         /* wait for srst to float back up */
 164         if (!srst)
 165         {
 166                 int i;
 167                 for (i = 0; i<1000; i++)
 168                 {
 169                         // We don't want to sense our own reset, so we clear here.
 170                         // There is of course a timing hole where we could loose
 171                         // a "real" reset.
 172                         if (!readSRST())
 173                                 break;
 174
 175                         /* wait 1ms */
 176                         alive_sleep(1);
 177                 }
 178
 179                 if (i == 1000)
 180                 {
 181                         LOG_USER("SRST didn't deassert after %dms", i);
 182                 } else if (i>1)
 183                 {
 184                         LOG_USER("SRST took %dms to deassert", i);
 185                 }
 186         }
 187 }
 188
 189 int zy1000_speed(int speed)
 190 {
 191         if (speed == 0)
 192         {
 193                 /*0 means RCLK*/
 194                 speed = 0;
 195                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x10, 0x100);
 196                 LOG_DEBUG("jtag_speed using RCLK");
 197         }
 198         else
 199         {
 200                 if (speed > 8190 || speed < 2)
 201                 {
 202                         LOG_USER("valid ZY1000 jtag_speed=[8190,2]. Divisor is 64MHz / even values between 8190-2, i.e. min 7814Hz, max 32MHz");
 203                         return ERROR_INVALID_ARGUMENTS;
 204                 }
 205
 206                 LOG_USER("jtag_speed %d => JTAG clk=%f", speed, 64.0/(float)speed);
 207                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x14, 0x100);
 208                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x1c, speed&~1);
 209         }
 210         return ERROR_OK;
 211 }
 212
 213 static bool savePower;
 214
 215
 216 static void setPower(bool power)
 217 {
 218         savePower = power;
 219         if (power)
 220         {
 221                 HAL_WRITE_UINT32(ZY1000_JTAG_BASE + 0x14, 0x8);
 222         } else
 223         {
 224                 HAL_WRITE_UINT32(ZY1000_JTAG_BASE + 0x10, 0x8);
 225         }
 226 }
 227
 228 int handle_power_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 229 {
 230         if (argc > 1)
 231         {
 232                 return ERROR_INVALID_ARGUMENTS;
 233         }
 234
 235         if (argc == 1)
 236         {
 237                 if (strcmp(args[0], "on") == 0)
 238                 {
 239                         setPower(1);
 240                 }
 241                 else if (strcmp(args[0], "off") == 0)
 242                 {
 243                         setPower(0);
 244                 } else
 245                 {
 246                         command_print(cmd_ctx, "arg is \"on\" or \"off\"");
 247                         return ERROR_INVALID_ARGUMENTS;
 248                 }
 249         }
 250
 251         command_print(cmd_ctx, "Target power %s", savePower ? "on" : "off");
 252
 253         return ERROR_OK;
 254 }
 255
 256
 257 /* Give TELNET a way to find out what version this is */
 258 static int jim_zy1000_version(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 259 {
 260         if ((argc < 1) || (argc > 2))
 261                 return JIM_ERR;
 262         char buff[128];
 263         const char *version_str = NULL;
 264
 265         if (argc == 1)
 266         {
 267                 version_str = ZYLIN_OPENOCD_VERSION;
 268         } else
 269         {
 270                 const char *str = Jim_GetString(argv[1], NULL);
 271                 if (strcmp("openocd", str) == 0)
 272                 {
 273                         int revision;
 274                         revision = atol(ZYLIN_OPENOCD + strlen("XRevision: "));
 275                         sprintf(buff, "%d", revision);
 276                         version_str = buff;
 277                 }
 278                 else if (strcmp("zy1000", str) == 0)
 279                 {
 280                         version_str = ZYLIN_VERSION;
 281                 }
 282                 else if (strcmp("date", str) == 0)
 283                 {
 284                         version_str = ZYLIN_DATE;
 285                 }
 286                 else
 287                 {
 288                         return JIM_ERR;
 289                 }
 290         }
 291
 292         Jim_SetResult(interp, Jim_NewStringObj(interp, version_str, -1));
 293
 294         return JIM_OK;
 295 }
 296
 297
 298 static int
 299 zylinjtag_Jim_Command_powerstatus(Jim_Interp *interp,
 300                                                                    int argc,
 301                 Jim_Obj * const *argv)
 302 {
 303         if (argc != 1)
 304         {
 305                 Jim_WrongNumArgs(interp, 1, argv, "powerstatus");
 306                 return JIM_ERR;
 307         }
 308
 309         cyg_uint32 status;
 310         ZY1000_PEEK(ZY1000_JTAG_BASE + 0x10, status);
 311
 312         Jim_SetResult(interp, Jim_NewIntObj(interp, (status&0x80) != 0));
 313
 314         return JIM_OK;
 315 }
 316
 317 int zy1000_register_commands(struct command_context_s *cmd_ctx)
 318 {
 319         register_command(cmd_ctx, NULL, "power", handle_power_command, COMMAND_ANY,
 320                         "power <on/off> - turn power switch to target on/off. No arguments - print status.");
 321
 322         Jim_CreateCommand(interp, "zy1000_version", jim_zy1000_version, NULL, NULL);
 323
 324
 325         Jim_CreateCommand(interp, "powerstatus", zylinjtag_Jim_Command_powerstatus, NULL, NULL);
 326
 327         return ERROR_OK;
 328 }
 329
 330
 331
 332
 333 int zy1000_init(void)
 334 {
 335         LOG_USER("%s", ZYLIN_OPENOCD_VERSION);
 336
 337         ZY1000_POKE(ZY1000_JTAG_BASE + 0x10, 0x30); // Turn on LED1 & LED2
 338
 339         setPower(true); // on by default
 340
 341
 342          /* deassert resets. Important to avoid infinite loop waiting for SRST to deassert */
 343         zy1000_reset(0, 0);
 344         zy1000_speed(jtag_get_speed());
 345
 346         return ERROR_OK;
 347 }
 348
 349 int zy1000_quit(void)
 350 {
 351
 352         return ERROR_OK;
 353 }
 354
 355
 356
 357 int interface_jtag_execute_queue(void)
 358 {
 359         cyg_uint32 empty;
 360
 361         waitIdle();
 362         ZY1000_PEEK(ZY1000_JTAG_BASE + 0x10, empty);
 363         /* clear JTAG error register */
 364         ZY1000_POKE(ZY1000_JTAG_BASE + 0x14, 0x400);
 365
 366         if ((empty&0x400) != 0)
 367         {
 368                 LOG_WARNING("RCLK timeout");
 369                 /* the error is informative only as we don't want to break the firmware if there
 370                  * is a false positive.
 371                  */
 372 //              return ERROR_FAIL;
 373         }
 374         return ERROR_OK;
 375 }
 376
 377
 378
 379
 380
 381 static cyg_uint32 getShiftValue(void)
 382 {
 383         cyg_uint32 value;
 384         waitIdle();
 385         ZY1000_PEEK(ZY1000_JTAG_BASE + 0xc, value);
 386         VERBOSE(LOG_INFO("getShiftValue %08x", value));
 387         return value;
 388 }
 389 #if 0
 390 static cyg_uint32 getShiftValueFlip(void)
 391 {
 392         cyg_uint32 value;
 393         waitIdle();
 394         ZY1000_PEEK(ZY1000_JTAG_BASE + 0x18, value);
 395         VERBOSE(LOG_INFO("getShiftValue %08x (flipped)", value));
 396         return value;
 397 }
 398 #endif
 399
 400 #if 0
 401 static void shiftValueInnerFlip(const tap_state_t state, const tap_state_t endState, int repeat, cyg_uint32 value)
 402 {
 403         VERBOSE(LOG_INFO("shiftValueInner %s %s %d %08x (flipped)", tap_state_name(state), tap_state_name(endState), repeat, value));
 404         cyg_uint32 a,b;
 405         a = state;
 406         b = endState;
 407         ZY1000_POKE(ZY1000_JTAG_BASE + 0xc, value);
 408         ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (1 << 15) | (repeat << 8) | (a << 4) | b);
 409         VERBOSE(getShiftValueFlip());
 410 }
 411 #endif
 412
 413 extern int jtag_check_value(uint8_t *captured, void *priv);
 414
 415 static __inline void scanFields(int num_fields, const scan_field_t *fields, tap_state_t shiftState, tap_state_t end_state)
 416 {
 417         int i;
 418         int j;
 419         int k;
 420
 421         for (i = 0; i < num_fields; i++)
 422         {
 423                 cyg_uint32 value;
 424
 425                 uint8_t *inBuffer = NULL;
 426
 427
 428                 // figure out where to store the input data
 429                 int num_bits = fields[i].num_bits;
 430                 if (fields[i].in_value != NULL)
 431                 {
 432                         inBuffer = fields[i].in_value;
 433                 }
 434
 435                 // here we shuffle N bits out/in
 436                 j = 0;
 437                 while (j<num_bits)
 438                 {
 439                         tap_state_t pause_state;
 440                         int l;
 441                         k = num_bits-j;
 442                         pause_state = (shiftState == TAP_DRSHIFT)?TAP_DRSHIFT:TAP_IRSHIFT;
 443                         if (k>32)
 444                         {
 445                                 k = 32;
 446                                 /* we have more to shift out */
 447                         } else if (i == num_fields-1)
 448                         {
 449                                 /* this was the last to shift out this time */
 450                                 pause_state = end_state;
 451                         }
 452
 453                         // we have (num_bits + 7)/8 bytes of bits to toggle out.
 454                         // bits are pushed out LSB to MSB
 455                         value = 0;
 456                         if (fields[i].out_value != NULL)
 457                         {
 458                                 for (l = 0; l<k; l += 8)
 459                                 {
 460                                         value|=fields[i].out_value[(j + l)/8]<<l;
 461                                 }
 462                         }
 463                         /* mask away unused bits for easier debugging */
 464                         value&=~(((uint32_t)0xffffffff) << k);
 465
 466                         shiftValueInner(shiftState, pause_state, k, value);
 467
 468                         if (inBuffer != NULL)
 469                         {
 470                                 // data in, LSB to MSB
 471                                 value = getShiftValue();
 472                                 // we're shifting in data to MSB, shift data to be aligned for returning the value
 473                                 value >>= 32-k;
 474
 475                                 for (l = 0; l<k; l += 8)
 476                                 {
 477                                         inBuffer[(j + l)/8]=(value >> l)&0xff;
 478                                 }
 479                         }
 480                         j += k;
 481                 }
 482         }
 483 }
 484
 485 int interface_jtag_set_end_state(tap_state_t state)
 486 {
 487         return ERROR_OK;
 488 }
 489
 490
 491 int interface_jtag_add_ir_scan(int num_fields, const scan_field_t *fields, tap_state_t state)
 492 {
 493
 494         int j;
 495         int scan_size = 0;
 496         jtag_tap_t *tap, *nextTap;
 497         for (tap = jtag_tap_next_enabled(NULL); tap!= NULL; tap = nextTap)
 498         {
 499                 nextTap = jtag_tap_next_enabled(tap);
 500                 tap_state_t end_state;
 501                 if (nextTap == NULL)
 502                 {
 503                         end_state = state;
 504                 } else
 505                 {
 506                         end_state = TAP_IRSHIFT;
 507                 }
 508
 509                 int found = 0;
 510
 511                 scan_size = tap->ir_length;
 512
 513                 /* search the list */
 514                 for (j = 0; j < num_fields; j++)
 515                 {
 516                         if (tap == fields[j].tap)
 517                         {
 518                                 found = 1;
 519
 520                                 scanFields(1, fields + j, TAP_IRSHIFT, end_state);
 521                                 /* update device information */
 522                                 buf_cpy(fields[j].out_value, tap->cur_instr, scan_size);
 523
 524                                 tap->bypass = 0;
 525                                 break;
 526                         }
 527                 }
 528
 529                 if (!found)
 530                 {
 531                         /* if a device isn't listed, set it to BYPASS */
 532                         uint8_t ones[]={0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};
 533
 534                         scan_field_t tmp;
 535                         memset(&tmp, 0, sizeof(tmp));
 536                         tmp.out_value = ones;
 537                         tmp.num_bits = scan_size;
 538                         scanFields(1, &tmp, TAP_IRSHIFT, end_state);
 539                         /* update device information */
 540                         buf_cpy(tmp.out_value, tap->cur_instr, scan_size);
 541                         tap->bypass = 1;
 542                 }
 543         }
 544
 545         return ERROR_OK;
 546 }
 547
 548
 549
 550
 551
 552 int interface_jtag_add_plain_ir_scan(int num_fields, const scan_field_t *fields, tap_state_t state)
 553 {
 554         scanFields(num_fields, fields, TAP_IRSHIFT, state);
 555
 556         return ERROR_OK;
 557 }
 558
 559 /*extern jtag_command_t **jtag_get_last_command_p(void);*/
 560
 561 int interface_jtag_add_dr_scan(int num_fields, const scan_field_t *fields, tap_state_t state)
 562 {
 563
 564         int j;
 565         jtag_tap_t *tap, *nextTap;
 566         for (tap = jtag_tap_next_enabled(NULL); tap!= NULL; tap = nextTap)
 567         {
 568                 nextTap = jtag_tap_next_enabled(tap);
 569                 int found = 0;
 570                 tap_state_t end_state;
 571                 if (nextTap == NULL)
 572                 {
 573                         end_state = state;
 574                 } else
 575                 {
 576                         end_state = TAP_DRSHIFT;
 577                 }
 578
 579                 for (j = 0; j < num_fields; j++)
 580                 {
 581                         if (tap == fields[j].tap)
 582                         {
 583                                 found = 1;
 584
 585                                 scanFields(1, fields + j, TAP_DRSHIFT, end_state);
 586                         }
 587                 }
 588                 if (!found)
 589                 {
 590                         scan_field_t tmp;
 591                         /* program the scan field to 1 bit length, and ignore it's value */
 592                         tmp.num_bits = 1;
 593                         tmp.out_value = NULL;
 594                         tmp.in_value = NULL;
 595
 596                         scanFields(1, &tmp, TAP_DRSHIFT, end_state);
 597                 }
 598                 else
 599                 {
 600                 }
 601         }
 602         return ERROR_OK;
 603 }
 604
 605 int interface_jtag_add_plain_dr_scan(int num_fields, const scan_field_t *fields, tap_state_t state)
 606 {
 607         scanFields(num_fields, fields, TAP_DRSHIFT, state);
 608         return ERROR_OK;
 609 }
 610
 611
 612 int interface_jtag_add_tlr()
 613 {
 614         setCurrentState(TAP_RESET);
 615         return ERROR_OK;
 616 }
 617
 618
 619
 620
 621 extern int jtag_nsrst_delay;
 622 extern int jtag_ntrst_delay;
 623
 624 int interface_jtag_add_reset(int req_trst, int req_srst)
 625 {
 626         zy1000_reset(req_trst, req_srst);
 627         return ERROR_OK;
 628 }
 629
 630 static int zy1000_jtag_add_clocks(int num_cycles, tap_state_t state, tap_state_t clockstate)
 631 {
 632         /* num_cycles can be 0 */
 633         setCurrentState(clockstate);
 634
 635         /* execute num_cycles, 32 at the time. */
 636         int i;
 637         for (i = 0; i<num_cycles; i += 32)
 638         {
 639                 int num;
 640                 num = 32;
 641                 if (num_cycles-i<num)
 642                 {
 643                         num = num_cycles-i;
 644                 }
 645                 shiftValueInner(clockstate, clockstate, num, 0);
 646         }
 647
 648 #if !TEST_MANUAL()
 649         /* finish in end_state */
 650         setCurrentState(state);
 651 #else
 652         tap_state_t t = TAP_IDLE;
 653         /* test manual drive code on any target */
 654         int tms;
 655         uint8_t tms_scan = tap_get_tms_path(t, state);
 656         int tms_count = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
 657
 658         for (i = 0; i < tms_count; i++)
 659         {
 660                 tms = (tms_scan >> i) & 1;
 661                 waitIdle();
 662                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x28,  tms);
 663         }
 664         waitIdle();
 665         ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, state);
 666 #endif
 667
 668
 669         return ERROR_OK;
 670 }
 671
 672 int interface_jtag_add_runtest(int num_cycles, tap_state_t state)
 673 {
 674         return zy1000_jtag_add_clocks(num_cycles, state, TAP_IDLE);
 675 }
 676
 677 int interface_jtag_add_clocks(int num_cycles)
 678 {
 679         return zy1000_jtag_add_clocks(num_cycles, cmd_queue_cur_state, cmd_queue_cur_state);
 680 }
 681
 682 int interface_jtag_add_sleep(uint32_t us)
 683 {
 684         jtag_sleep(us);
 685         return ERROR_OK;
 686 }
 687
 688 int interface_jtag_add_pathmove(int num_states, const tap_state_t *path)
 689 {
 690         int state_count;
 691         int tms = 0;
 692
 693         /*wait for the fifo to be empty*/
 694         waitIdle();
 695
 696         state_count = 0;
 697
 698         tap_state_t cur_state = cmd_queue_cur_state;
 699
 700         while (num_states)
 701         {
 702                 if (tap_state_transition(cur_state, false) == path[state_count])
 703                 {
 704                         tms = 0;
 705                 }
 706                 else if (tap_state_transition(cur_state, true) == path[state_count])
 707                 {
 708                         tms = 1;
 709                 }
 710                 else
 711                 {
 712                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(cur_state), tap_state_name(path[state_count]));
 713                         exit(-1);
 714                 }
 715
 716                 waitIdle();
 717                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x28,  tms);
 718
 719                 cur_state = path[state_count];
 720                 state_count++;
 721                 num_states--;
 722         }
 723
 724         waitIdle();
 725         ZY1000_POKE(ZY1000_JTAG_BASE + 0x20,  cur_state);
 726         return ERROR_OK;
 727 }
 728
 729
 730
 731 void embeddedice_write_dcc(jtag_tap_t *tap, int reg_addr, uint8_t *buffer, int little, int count)
 732 {
 733 //      static int const reg_addr = 0x5;
 734         tap_state_t end_state = jtag_get_end_state();
 735         if (jtag_tap_next_enabled(jtag_tap_next_enabled(NULL)) == NULL)
 736         {
 737                 /* better performance via code duplication */
 738                 if (little)
 739                 {
 740                         int i;
 741                         for (i = 0; i < count; i++)
 742                         {
 743                                 shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, 32, fast_target_buffer_get_u32(buffer, 1));
 744                                 shiftValueInner(TAP_DRSHIFT, end_state, 6, reg_addr | (1 << 5));
 745                                 buffer += 4;
 746                         }
 747                 } else
 748                 {
 749                         int i;
 750                         for (i = 0; i < count; i++)
 751                         {
 752                                 shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, 32, fast_target_buffer_get_u32(buffer, 0));
 753                                 shiftValueInner(TAP_DRSHIFT, end_state, 6, reg_addr | (1 << 5));
 754                                 buffer += 4;
 755                         }
 756                 }
 757         }
 758         else
 759         {
 760                 int i;
 761                 for (i = 0; i < count; i++)
 762                 {
 763                         embeddedice_write_reg_inner(tap, reg_addr, fast_target_buffer_get_u32(buffer, little));
 764                         buffer += 4;
 765                 }
 766         }
 767 }
 768
 769