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   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 #include "zy1000_version.h"
  27
  28 #include <cyg/hal/hal_io.h>             // low level i/o
  29 #include <cyg/hal/hal_diag.h>
  30
  31 #define ZYLIN_VERSION GIT_ZY1000_VERSION
  32 #define ZYLIN_DATE __DATE__
  33 #define ZYLIN_TIME __TIME__
  34 #define ZYLIN_OPENOCD GIT_OPENOCD_VERSION
  35 #define ZYLIN_OPENOCD_VERSION "ZY1000 " ZYLIN_VERSION " " ZYLIN_DATE
  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 *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 *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 struct jtag_interface 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 *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                         version_str = ZYLIN_OPENOCD;
 274                 }
 275                 else if (strcmp("zy1000", str) == 0)
 276                 {
 277                         version_str = ZYLIN_VERSION;
 278                 }
 279                 else if (strcmp("date", str) == 0)
 280                 {
 281                         version_str = ZYLIN_DATE;
 282                 }
 283                 else if (strcmp("time", str) == 0)
 284                 {
 285                         version_str = ZYLIN_TIME;
 286                 }
 287                 else if (strcmp("pcb", str) == 0)
 288                 {
 289 #ifdef CYGPKG_HAL_NIOS2
 290                         version_str="c";
 291 #else
 292                         version_str="b";
 293 #endif
 294                 }
 295                 else
 296                 {
 297                         return JIM_ERR;
 298                 }
 299         }
 300
 301         Jim_SetResult(interp, Jim_NewStringObj(interp, version_str, -1));
 302
 303         return JIM_OK;
 304 }
 305
 306
 307 #ifdef CYGPKG_HAL_NIOS2
 308 static int jim_zy1000_writefirmware(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 309 {
 310         if (argc != 2)
 311                 return JIM_ERR;
 312
 313         int length;
 314         int stat;
 315         const char *str = Jim_GetString(argv[1], &length);
 316
 317         /* BUG!!!! skip header! */
 318         void *firmware_address=0x4000000;
 319         int firmware_length=0x100000;
 320
 321         if (length>firmware_length)
 322                 return JIM_ERR;
 323
 324         void *err_addr;
 325
 326     if ((stat = flash_erase((void *)firmware_address, firmware_length, (void **)&err_addr)) != 0)
 327     {
 328         return JIM_ERR;
 329     }
 330
 331     if ((stat = flash_program(firmware_address, str, length, (void **)&err_addr)) != 0)
 332         return JIM_ERR;
 333
 334     return JIM_OK;
 335 }
 336 #endif
 337
 338 static int
 339 zylinjtag_Jim_Command_powerstatus(Jim_Interp *interp,
 340                                                                    int argc,
 341                 Jim_Obj * const *argv)
 342 {
 343         if (argc != 1)
 344         {
 345                 Jim_WrongNumArgs(interp, 1, argv, "powerstatus");
 346                 return JIM_ERR;
 347         }
 348
 349         cyg_uint32 status;
 350         ZY1000_PEEK(ZY1000_JTAG_BASE + 0x10, status);
 351
 352         Jim_SetResult(interp, Jim_NewIntObj(interp, (status&0x80) != 0));
 353
 354         return JIM_OK;
 355 }
 356
 357 int zy1000_register_commands(struct command_context *cmd_ctx)
 358 {
 359         register_command(cmd_ctx, NULL, "power", handle_power_command, COMMAND_ANY,
 360                         "power <on/off> - turn power switch to target on/off. No arguments - print status.");
 361
 362         Jim_CreateCommand(interp, "zy1000_version", jim_zy1000_version, NULL, NULL);
 363
 364
 365         Jim_CreateCommand(interp, "powerstatus", zylinjtag_Jim_Command_powerstatus, NULL, NULL);
 366
 367 #ifdef CYGPKG_HAL_NIOS2
 368         Jim_CreateCommand(interp, "updatezy1000firmware", jim_zy1000_writefirmware, NULL, NULL);
 369 #endif
 370
 371
 372         return ERROR_OK;
 373 }
 374
 375
 376
 377
 378 int zy1000_init(void)
 379 {
 380         LOG_USER("%s", ZYLIN_OPENOCD_VERSION);
 381
 382         ZY1000_POKE(ZY1000_JTAG_BASE + 0x10, 0x30); // Turn on LED1 & LED2
 383
 384         setPower(true); // on by default
 385
 386
 387          /* deassert resets. Important to avoid infinite loop waiting for SRST to deassert */
 388         zy1000_reset(0, 0);
 389         zy1000_speed(jtag_get_speed());
 390
 391         return ERROR_OK;
 392 }
 393
 394 int zy1000_quit(void)
 395 {
 396
 397         return ERROR_OK;
 398 }
 399
 400
 401
 402 int interface_jtag_execute_queue(void)
 403 {
 404         cyg_uint32 empty;
 405
 406         waitIdle();
 407         ZY1000_PEEK(ZY1000_JTAG_BASE + 0x10, empty);
 408         /* clear JTAG error register */
 409         ZY1000_POKE(ZY1000_JTAG_BASE + 0x14, 0x400);
 410
 411         if ((empty&0x400) != 0)
 412         {
 413                 LOG_WARNING("RCLK timeout");
 414                 /* the error is informative only as we don't want to break the firmware if there
 415                  * is a false positive.
 416                  */
 417 //              return ERROR_FAIL;
 418         }
 419         return ERROR_OK;
 420 }
 421
 422
 423
 424
 425
 426 static cyg_uint32 getShiftValue(void)
 427 {
 428         cyg_uint32 value;
 429         waitIdle();
 430         ZY1000_PEEK(ZY1000_JTAG_BASE + 0xc, value);
 431         VERBOSE(LOG_INFO("getShiftValue %08x", value));
 432         return value;
 433 }
 434 #if 0
 435 static cyg_uint32 getShiftValueFlip(void)
 436 {
 437         cyg_uint32 value;
 438         waitIdle();
 439         ZY1000_PEEK(ZY1000_JTAG_BASE + 0x18, value);
 440         VERBOSE(LOG_INFO("getShiftValue %08x (flipped)", value));
 441         return value;
 442 }
 443 #endif
 444
 445 #if 0
 446 static void shiftValueInnerFlip(const tap_state_t state, const tap_state_t endState, int repeat, cyg_uint32 value)
 447 {
 448         VERBOSE(LOG_INFO("shiftValueInner %s %s %d %08x (flipped)", tap_state_name(state), tap_state_name(endState), repeat, value));
 449         cyg_uint32 a,b;
 450         a = state;
 451         b = endState;
 452         ZY1000_POKE(ZY1000_JTAG_BASE + 0xc, value);
 453         ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (1 << 15) | (repeat << 8) | (a << 4) | b);
 454         VERBOSE(getShiftValueFlip());
 455 }
 456 #endif
 457
 458 static void gotoEndState(tap_state_t end_state)
 459 {
 460         setCurrentState(end_state);
 461 }
 462
 463 static __inline void scanFields(int num_fields, const struct scan_field *fields, tap_state_t shiftState, int pause)
 464 {
 465         int i;
 466         int j;
 467         int k;
 468
 469         for (i = 0; i < num_fields; i++)
 470         {
 471                 cyg_uint32 value;
 472
 473                 uint8_t *inBuffer = NULL;
 474
 475
 476                 // figure out where to store the input data
 477                 int num_bits = fields[i].num_bits;
 478                 if (fields[i].in_value != NULL)
 479                 {
 480                         inBuffer = fields[i].in_value;
 481                 }
 482
 483                 // here we shuffle N bits out/in
 484                 j = 0;
 485                 while (j < num_bits)
 486                 {
 487                         tap_state_t pause_state;
 488                         int l;
 489                         k = num_bits-j;
 490                         pause_state = (shiftState == TAP_DRSHIFT)?TAP_DRSHIFT:TAP_IRSHIFT;
 491                         if (k > 32)
 492                         {
 493                                 k = 32;
 494                                 /* we have more to shift out */
 495                         } else if (pause&&(i == num_fields-1))
 496                         {
 497                                 /* this was the last to shift out this time */
 498                                 pause_state = (shiftState==TAP_DRSHIFT)?TAP_DRPAUSE:TAP_IRPAUSE;
 499                         }
 500
 501                         // we have (num_bits + 7)/8 bytes of bits to toggle out.
 502                         // bits are pushed out LSB to MSB
 503                         value = 0;
 504                         if (fields[i].out_value != NULL)
 505                         {
 506                                 for (l = 0; l < k; l += 8)
 507                                 {
 508                                         value|=fields[i].out_value[(j + l)/8]<<l;
 509                                 }
 510                         }
 511                         /* mask away unused bits for easier debugging */
 512                         if (k < 32)
 513                         {
 514                                 value&=~(((uint32_t)0xffffffff) << k);
 515                         } else
 516                         {
 517                                 /* Shifting by >= 32 is not defined by the C standard
 518                                  * and will in fact shift by &0x1f bits on nios */
 519                         }
 520
 521                         shiftValueInner(shiftState, pause_state, k, value);
 522
 523                         if (inBuffer != NULL)
 524                         {
 525                                 // data in, LSB to MSB
 526                                 value = getShiftValue();
 527                                 // we're shifting in data to MSB, shift data to be aligned for returning the value
 528                                 value >>= 32-k;
 529
 530                                 for (l = 0; l < k; l += 8)
 531                                 {
 532                                         inBuffer[(j + l)/8]=(value >> l)&0xff;
 533                                 }
 534                         }
 535                         j += k;
 536                 }
 537         }
 538 }
 539
 540 int interface_jtag_add_ir_scan(int num_fields, const struct scan_field *fields, tap_state_t state)
 541 {
 542
 543         int j;
 544         int scan_size = 0;
 545         struct jtag_tap *tap, *nextTap;
 546         for (tap = jtag_tap_next_enabled(NULL); tap!= NULL; tap = nextTap)
 547         {
 548                 nextTap = jtag_tap_next_enabled(tap);
 549                 int pause = (nextTap==NULL);
 550
 551                 int found = 0;
 552
 553                 scan_size = tap->ir_length;
 554
 555                 /* search the list */
 556                 for (j = 0; j < num_fields; j++)
 557                 {
 558                         if (tap == fields[j].tap)
 559                         {
 560                                 found = 1;
 561
 562                                 scanFields(1, fields + j, TAP_IRSHIFT, pause);
 563                                 /* update device information */
 564                                 buf_cpy(fields[j].out_value, tap->cur_instr, scan_size);
 565
 566                                 tap->bypass = 0;
 567                                 break;
 568                         }
 569                 }
 570
 571                 if (!found)
 572                 {
 573                         /* if a device isn't listed, set it to BYPASS */
 574                         uint8_t ones[]={0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};
 575
 576                         struct scan_field tmp;
 577                         memset(&tmp, 0, sizeof(tmp));
 578                         tmp.out_value = ones;
 579                         tmp.num_bits = scan_size;
 580                         scanFields(1, &tmp, TAP_IRSHIFT, pause);
 581                         /* update device information */
 582                         buf_cpy(tmp.out_value, tap->cur_instr, scan_size);
 583                         tap->bypass = 1;
 584                 }
 585         }
 586         gotoEndState(state);
 587
 588         return ERROR_OK;
 589 }
 590
 591
 592
 593
 594
 595 int interface_jtag_add_plain_ir_scan(int num_fields, const struct scan_field *fields, tap_state_t state)
 596 {
 597         scanFields(num_fields, fields, TAP_IRSHIFT, 1);
 598         gotoEndState(state);
 599
 600         return ERROR_OK;
 601 }
 602
 603 int interface_jtag_add_dr_scan(int num_fields, const struct scan_field *fields, tap_state_t state)
 604 {
 605
 606         int j;
 607         struct jtag_tap *tap, *nextTap;
 608         for (tap = jtag_tap_next_enabled(NULL); tap!= NULL; tap = nextTap)
 609         {
 610                 nextTap = jtag_tap_next_enabled(tap);
 611                 int found = 0;
 612                 int pause = (nextTap==NULL);
 613
 614                 for (j = 0; j < num_fields; j++)
 615                 {
 616                         if (tap == fields[j].tap)
 617                         {
 618                                 found = 1;
 619
 620                                 scanFields(1, fields+j, TAP_DRSHIFT, pause);
 621                         }
 622                 }
 623                 if (!found)
 624                 {
 625                         struct scan_field tmp;
 626                         /* program the scan field to 1 bit length, and ignore it's value */
 627                         tmp.num_bits = 1;
 628                         tmp.out_value = NULL;
 629                         tmp.in_value = NULL;
 630
 631                         scanFields(1, &tmp, TAP_DRSHIFT, pause);
 632                 }
 633                 else
 634                 {
 635                 }
 636         }
 637         gotoEndState(state);
 638         return ERROR_OK;
 639 }
 640
 641 int interface_jtag_add_plain_dr_scan(int num_fields, const struct scan_field *fields, tap_state_t state)
 642 {
 643         scanFields(num_fields, fields, TAP_DRSHIFT, 1);
 644         gotoEndState(state);
 645         return ERROR_OK;
 646 }
 647
 648
 649 int interface_jtag_add_tlr()
 650 {
 651         setCurrentState(TAP_RESET);
 652         return ERROR_OK;
 653 }
 654
 655
 656
 657
 658 int interface_jtag_add_reset(int req_trst, int req_srst)
 659 {
 660         zy1000_reset(req_trst, req_srst);
 661         return ERROR_OK;
 662 }
 663
 664 static int zy1000_jtag_add_clocks(int num_cycles, tap_state_t state, tap_state_t clockstate)
 665 {
 666         /* num_cycles can be 0 */
 667         setCurrentState(clockstate);
 668
 669         /* execute num_cycles, 32 at the time. */
 670         int i;
 671         for (i = 0; i < num_cycles; i += 32)
 672         {
 673                 int num;
 674                 num = 32;
 675                 if (num_cycles-i < num)
 676                 {
 677                         num = num_cycles-i;
 678                 }
 679                 shiftValueInner(clockstate, clockstate, num, 0);
 680         }
 681
 682 #if !TEST_MANUAL()
 683         /* finish in end_state */
 684         setCurrentState(state);
 685 #else
 686         tap_state_t t = TAP_IDLE;
 687         /* test manual drive code on any target */
 688         int tms;
 689         uint8_t tms_scan = tap_get_tms_path(t, state);
 690         int tms_count = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
 691
 692         for (i = 0; i < tms_count; i++)
 693         {
 694                 tms = (tms_scan >> i) & 1;
 695                 waitIdle();
 696                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x28,  tms);
 697         }
 698         waitIdle();
 699         ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, state);
 700 #endif
 701
 702
 703         return ERROR_OK;
 704 }
 705
 706 int interface_jtag_add_runtest(int num_cycles, tap_state_t state)
 707 {
 708         return zy1000_jtag_add_clocks(num_cycles, state, TAP_IDLE);
 709 }
 710
 711 int interface_jtag_add_clocks(int num_cycles)
 712 {
 713         return zy1000_jtag_add_clocks(num_cycles, cmd_queue_cur_state, cmd_queue_cur_state);
 714 }
 715
 716 int interface_jtag_add_sleep(uint32_t us)
 717 {
 718         jtag_sleep(us);
 719         return ERROR_OK;
 720 }
 721
 722 int interface_jtag_add_pathmove(int num_states, const tap_state_t *path)
 723 {
 724         int state_count;
 725         int tms = 0;
 726
 727         /*wait for the fifo to be empty*/
 728         waitIdle();
 729
 730         state_count = 0;
 731
 732         tap_state_t cur_state = cmd_queue_cur_state;
 733
 734         while (num_states)
 735         {
 736                 if (tap_state_transition(cur_state, false) == path[state_count])
 737                 {
 738                         tms = 0;
 739                 }
 740                 else if (tap_state_transition(cur_state, true) == path[state_count])
 741                 {
 742                         tms = 1;
 743                 }
 744                 else
 745                 {
 746                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(cur_state), tap_state_name(path[state_count]));
 747                         exit(-1);
 748                 }
 749
 750                 waitIdle();
 751                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x28,  tms);
 752
 753                 cur_state = path[state_count];
 754                 state_count++;
 755                 num_states--;
 756         }
 757
 758         waitIdle();
 759         ZY1000_POKE(ZY1000_JTAG_BASE + 0x20,  cur_state);
 760         return ERROR_OK;
 761 }
 762
 763
 764
 765 void embeddedice_write_dcc(struct jtag_tap *tap, int reg_addr, uint8_t *buffer, int little, int count)
 766 {
 767 //      static int const reg_addr = 0x5;
 768         tap_state_t end_state = jtag_get_end_state();
 769         if (jtag_tap_next_enabled(jtag_tap_next_enabled(NULL)) == NULL)
 770         {
 771                 /* better performance via code duplication */
 772                 if (little)
 773                 {
 774                         int i;
 775                         for (i = 0; i < count; i++)
 776                         {
 777                                 shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, 32, fast_target_buffer_get_u32(buffer, 1));
 778                                 shiftValueInner(TAP_DRSHIFT, end_state, 6, reg_addr | (1 << 5));
 779                                 buffer += 4;
 780                         }
 781                 } else
 782                 {
 783                         int i;
 784                         for (i = 0; i < count; i++)
 785                         {
 786                                 shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, 32, fast_target_buffer_get_u32(buffer, 0));
 787                                 shiftValueInner(TAP_DRSHIFT, end_state, 6, reg_addr | (1 << 5));
 788                                 buffer += 4;
 789                         }
 790                 }
 791         }
 792         else
 793         {
 794                 int i;
 795                 for (i = 0; i < count; i++)
 796                 {
 797                         embeddedice_write_reg_inner(tap, reg_addr, fast_target_buffer_get_u32(buffer, little));
 798                         buffer += 4;
 799                 }
 800         }
 801 }
 802
 803