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 "1.54"
  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 if (strcmp("pcb", str) == 0)
 287                 {
 288 #ifdef CYGPKG_HAL_NIOS2
 289                         version_str="c";
 290 #else
 291                         version_str="b";
 292 #endif
 293                 }
 294                 else
 295                 {
 296                         return JIM_ERR;
 297                 }
 298         }
 299
 300         Jim_SetResult(interp, Jim_NewStringObj(interp, version_str, -1));
 301
 302         return JIM_OK;
 303 }
 304
 305
 306 #ifdef CYGPKG_HAL_NIOS2
 307 static int jim_zy1000_writefirmware(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 308 {
 309         if (argc != 2)
 310                 return JIM_ERR;
 311
 312         int length;
 313         int stat;
 314         const char *str = Jim_GetString(argv[1], &length);
 315
 316         /* BUG!!!! skip header! */
 317         void *firmware_address=0x4000000;
 318         int firmware_length=0x100000;
 319
 320         if (length>firmware_length)
 321                 return JIM_ERR;
 322
 323         void *err_addr;
 324
 325     if ((stat = flash_erase((void *)firmware_address, firmware_length, (void **)&err_addr)) != 0)
 326     {
 327         return JIM_ERR;
 328     }
 329
 330     if ((stat = flash_program(firmware_address, str, length, (void **)&err_addr)) != 0)
 331         return JIM_ERR;
 332
 333     return JIM_OK;
 334 }
 335 #endif
 336
 337 static int
 338 zylinjtag_Jim_Command_powerstatus(Jim_Interp *interp,
 339                                                                    int argc,
 340                 Jim_Obj * const *argv)
 341 {
 342         if (argc != 1)
 343         {
 344                 Jim_WrongNumArgs(interp, 1, argv, "powerstatus");
 345                 return JIM_ERR;
 346         }
 347
 348         cyg_uint32 status;
 349         ZY1000_PEEK(ZY1000_JTAG_BASE + 0x10, status);
 350
 351         Jim_SetResult(interp, Jim_NewIntObj(interp, (status&0x80) != 0));
 352
 353         return JIM_OK;
 354 }
 355
 356 int zy1000_register_commands(struct command_context_s *cmd_ctx)
 357 {
 358         register_command(cmd_ctx, NULL, "power", handle_power_command, COMMAND_ANY,
 359                         "power <on/off> - turn power switch to target on/off. No arguments - print status.");
 360
 361         Jim_CreateCommand(interp, "zy1000_version", jim_zy1000_version, NULL, NULL);
 362
 363
 364         Jim_CreateCommand(interp, "powerstatus", zylinjtag_Jim_Command_powerstatus, NULL, NULL);
 365
 366 #ifdef CYGPKG_HAL_NIOS2
 367         Jim_CreateCommand(interp, "updatezy1000firmware", jim_zy1000_writefirmware, NULL, NULL);
 368 #endif
 369
 370
 371         return ERROR_OK;
 372 }
 373
 374
 375
 376
 377 int zy1000_init(void)
 378 {
 379         LOG_USER("%s", ZYLIN_OPENOCD_VERSION);
 380
 381         ZY1000_POKE(ZY1000_JTAG_BASE + 0x10, 0x30); // Turn on LED1 & LED2
 382
 383         setPower(true); // on by default
 384
 385
 386          /* deassert resets. Important to avoid infinite loop waiting for SRST to deassert */
 387         zy1000_reset(0, 0);
 388         zy1000_speed(jtag_get_speed());
 389
 390         return ERROR_OK;
 391 }
 392
 393 int zy1000_quit(void)
 394 {
 395
 396         return ERROR_OK;
 397 }
 398
 399
 400
 401 int interface_jtag_execute_queue(void)
 402 {
 403         cyg_uint32 empty;
 404
 405         waitIdle();
 406         ZY1000_PEEK(ZY1000_JTAG_BASE + 0x10, empty);
 407         /* clear JTAG error register */
 408         ZY1000_POKE(ZY1000_JTAG_BASE + 0x14, 0x400);
 409
 410         if ((empty&0x400) != 0)
 411         {
 412                 LOG_WARNING("RCLK timeout");
 413                 /* the error is informative only as we don't want to break the firmware if there
 414                  * is a false positive.
 415                  */
 416 //              return ERROR_FAIL;
 417         }
 418         return ERROR_OK;
 419 }
 420
 421
 422
 423
 424
 425 static cyg_uint32 getShiftValue(void)
 426 {
 427         cyg_uint32 value;
 428         waitIdle();
 429         ZY1000_PEEK(ZY1000_JTAG_BASE + 0xc, value);
 430         VERBOSE(LOG_INFO("getShiftValue %08x", value));
 431         return value;
 432 }
 433 #if 0
 434 static cyg_uint32 getShiftValueFlip(void)
 435 {
 436         cyg_uint32 value;
 437         waitIdle();
 438         ZY1000_PEEK(ZY1000_JTAG_BASE + 0x18, value);
 439         VERBOSE(LOG_INFO("getShiftValue %08x (flipped)", value));
 440         return value;
 441 }
 442 #endif
 443
 444 #if 0
 445 static void shiftValueInnerFlip(const tap_state_t state, const tap_state_t endState, int repeat, cyg_uint32 value)
 446 {
 447         VERBOSE(LOG_INFO("shiftValueInner %s %s %d %08x (flipped)", tap_state_name(state), tap_state_name(endState), repeat, value));
 448         cyg_uint32 a,b;
 449         a = state;
 450         b = endState;
 451         ZY1000_POKE(ZY1000_JTAG_BASE + 0xc, value);
 452         ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (1 << 15) | (repeat << 8) | (a << 4) | b);
 453         VERBOSE(getShiftValueFlip());
 454 }
 455 #endif
 456
 457 extern int jtag_check_value(uint8_t *captured, void *priv);
 458
 459 static void gotoEndState(tap_state_t end_state)
 460 {
 461         setCurrentState(end_state);
 462 }
 463
 464 static __inline void scanFields(int num_fields, const scan_field_t *fields, tap_state_t shiftState, int pause)
 465 {
 466         int i;
 467         int j;
 468         int k;
 469
 470         for (i = 0; i < num_fields; i++)
 471         {
 472                 cyg_uint32 value;
 473
 474                 uint8_t *inBuffer = NULL;
 475
 476
 477                 // figure out where to store the input data
 478                 int num_bits = fields[i].num_bits;
 479                 if (fields[i].in_value != NULL)
 480                 {
 481                         inBuffer = fields[i].in_value;
 482                 }
 483
 484                 // here we shuffle N bits out/in
 485                 j = 0;
 486                 while (j < num_bits)
 487                 {
 488                         tap_state_t pause_state;
 489                         int l;
 490                         k = num_bits-j;
 491                         pause_state = (shiftState == TAP_DRSHIFT)?TAP_DRSHIFT:TAP_IRSHIFT;
 492                         if (k > 32)
 493                         {
 494                                 k = 32;
 495                                 /* we have more to shift out */
 496                         } else if (pause&&(i == num_fields-1))
 497                         {
 498                                 /* this was the last to shift out this time */
 499                                 pause_state = (shiftState==TAP_DRSHIFT)?TAP_DRPAUSE:TAP_IRPAUSE;
 500                         }
 501
 502                         // we have (num_bits + 7)/8 bytes of bits to toggle out.
 503                         // bits are pushed out LSB to MSB
 504                         value = 0;
 505                         if (fields[i].out_value != NULL)
 506                         {
 507                                 for (l = 0; l < k; l += 8)
 508                                 {
 509                                         value|=fields[i].out_value[(j + l)/8]<<l;
 510                                 }
 511                         }
 512                         /* mask away unused bits for easier debugging */
 513                         value&=~(((uint32_t)0xffffffff) << k);
 514
 515                         shiftValueInner(shiftState, pause_state, k, value);
 516
 517                         if (inBuffer != NULL)
 518                         {
 519                                 // data in, LSB to MSB
 520                                 value = getShiftValue();
 521                                 // we're shifting in data to MSB, shift data to be aligned for returning the value
 522                                 value >>= 32-k;
 523
 524                                 for (l = 0; l < k; l += 8)
 525                                 {
 526                                         inBuffer[(j + l)/8]=(value >> l)&0xff;
 527                                 }
 528                         }
 529                         j += k;
 530                 }
 531         }
 532 }
 533
 534 int interface_jtag_set_end_state(tap_state_t state)
 535 {
 536         return ERROR_OK;
 537 }
 538
 539
 540 int interface_jtag_add_ir_scan(int num_fields, const scan_field_t *fields, tap_state_t state)
 541 {
 542
 543         int j;
 544         int scan_size = 0;
 545         jtag_tap_t *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                         scan_field_t 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 scan_field_t *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 /*extern jtag_command_t **jtag_get_last_command_p(void);*/
 604
 605 int interface_jtag_add_dr_scan(int num_fields, const scan_field_t *fields, tap_state_t state)
 606 {
 607
 608         int j;
 609         jtag_tap_t *tap, *nextTap;
 610         for (tap = jtag_tap_next_enabled(NULL); tap!= NULL; tap = nextTap)
 611         {
 612                 nextTap = jtag_tap_next_enabled(tap);
 613                 int found = 0;
 614                 int pause = (nextTap==NULL);
 615
 616                 for (j = 0; j < num_fields; j++)
 617                 {
 618                         if (tap == fields[j].tap)
 619                         {
 620                                 found = 1;
 621
 622                                 scanFields(1, fields+j, TAP_DRSHIFT, pause);
 623                         }
 624                 }
 625                 if (!found)
 626                 {
 627                         scan_field_t tmp;
 628                         /* program the scan field to 1 bit length, and ignore it's value */
 629                         tmp.num_bits = 1;
 630                         tmp.out_value = NULL;
 631                         tmp.in_value = NULL;
 632
 633                         scanFields(1, &tmp, TAP_DRSHIFT, pause);
 634                 }
 635                 else
 636                 {
 637                 }
 638         }
 639         gotoEndState(state);
 640         return ERROR_OK;
 641 }
 642
 643 int interface_jtag_add_plain_dr_scan(int num_fields, const scan_field_t *fields, tap_state_t state)
 644 {
 645         scanFields(num_fields, fields, TAP_DRSHIFT, 1);
 646         gotoEndState(state);
 647         return ERROR_OK;
 648 }
 649
 650
 651 int interface_jtag_add_tlr()
 652 {
 653         setCurrentState(TAP_RESET);
 654         return ERROR_OK;
 655 }
 656
 657
 658
 659
 660 int interface_jtag_add_reset(int req_trst, int req_srst)
 661 {
 662         zy1000_reset(req_trst, req_srst);
 663         return ERROR_OK;
 664 }
 665
 666 static int zy1000_jtag_add_clocks(int num_cycles, tap_state_t state, tap_state_t clockstate)
 667 {
 668         /* num_cycles can be 0 */
 669         setCurrentState(clockstate);
 670
 671         /* execute num_cycles, 32 at the time. */
 672         int i;
 673         for (i = 0; i < num_cycles; i += 32)
 674         {
 675                 int num;
 676                 num = 32;
 677                 if (num_cycles-i < num)
 678                 {
 679                         num = num_cycles-i;
 680                 }
 681                 shiftValueInner(clockstate, clockstate, num, 0);
 682         }
 683
 684 #if !TEST_MANUAL()
 685         /* finish in end_state */
 686         setCurrentState(state);
 687 #else
 688         tap_state_t t = TAP_IDLE;
 689         /* test manual drive code on any target */
 690         int tms;
 691         uint8_t tms_scan = tap_get_tms_path(t, state);
 692         int tms_count = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
 693
 694         for (i = 0; i < tms_count; i++)
 695         {
 696                 tms = (tms_scan >> i) & 1;
 697                 waitIdle();
 698                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x28,  tms);
 699         }
 700         waitIdle();
 701         ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, state);
 702 #endif
 703
 704
 705         return ERROR_OK;
 706 }
 707
 708 int interface_jtag_add_runtest(int num_cycles, tap_state_t state)
 709 {
 710         return zy1000_jtag_add_clocks(num_cycles, state, TAP_IDLE);
 711 }
 712
 713 int interface_jtag_add_clocks(int num_cycles)
 714 {
 715         return zy1000_jtag_add_clocks(num_cycles, cmd_queue_cur_state, cmd_queue_cur_state);
 716 }
 717
 718 int interface_jtag_add_sleep(uint32_t us)
 719 {
 720         jtag_sleep(us);
 721         return ERROR_OK;
 722 }
 723
 724 int interface_jtag_add_pathmove(int num_states, const tap_state_t *path)
 725 {
 726         int state_count;
 727         int tms = 0;
 728
 729         /*wait for the fifo to be empty*/
 730         waitIdle();
 731
 732         state_count = 0;
 733
 734         tap_state_t cur_state = cmd_queue_cur_state;
 735
 736         while (num_states)
 737         {
 738                 if (tap_state_transition(cur_state, false) == path[state_count])
 739                 {
 740                         tms = 0;
 741                 }
 742                 else if (tap_state_transition(cur_state, true) == path[state_count])
 743                 {
 744                         tms = 1;
 745                 }
 746                 else
 747                 {
 748                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(cur_state), tap_state_name(path[state_count]));
 749                         exit(-1);
 750                 }
 751
 752                 waitIdle();
 753                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x28,  tms);
 754
 755                 cur_state = path[state_count];
 756                 state_count++;
 757                 num_states--;
 758         }
 759
 760         waitIdle();
 761         ZY1000_POKE(ZY1000_JTAG_BASE + 0x20,  cur_state);
 762         return ERROR_OK;
 763 }
 764
 765
 766
 767 void embeddedice_write_dcc(jtag_tap_t *tap, int reg_addr, uint8_t *buffer, int little, int count)
 768 {
 769 //      static int const reg_addr = 0x5;
 770         tap_state_t end_state = jtag_get_end_state();
 771         if (jtag_tap_next_enabled(jtag_tap_next_enabled(NULL)) == NULL)
 772         {
 773                 /* better performance via code duplication */
 774                 if (little)
 775                 {
 776                         int i;
 777                         for (i = 0; i < count; i++)
 778                         {
 779                                 shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, 32, fast_target_buffer_get_u32(buffer, 1));
 780                                 shiftValueInner(TAP_DRSHIFT, end_state, 6, reg_addr | (1 << 5));
 781                                 buffer += 4;
 782                         }
 783                 } else
 784                 {
 785                         int i;
 786                         for (i = 0; i < count; i++)
 787                         {
 788                                 shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, 32, fast_target_buffer_get_u32(buffer, 0));
 789                                 shiftValueInner(TAP_DRSHIFT, end_state, 6, reg_addr | (1 << 5));
 790                                 buffer += 4;
 791                         }
 792                 }
 793         }
 794         else
 795         {
 796                 int i;
 797                 for (i = 0; i < count; i++)
 798                 {
 799                         embeddedice_write_reg_inner(tap, reg_addr, fast_target_buffer_get_u32(buffer, little));
 800                         buffer += 4;
 801                 }
 802         }
 803 }
 804
 805