git.gag.com Git - fw/openocd/blob - src/jtag/drivers/presto.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Pavel Chromy                                    *
   3  *   chromy@asix.cz                                                        *
   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 /**
  22  * @file
  23  * Holds driver for PRESTO programmer from ASIX.
  24  * http://tools.asix.net/prg_presto.htm
  25  */
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #if IS_CYGWIN == 1
  31 #include "windows.h"
  32 #endif
  33
  34 #include <jtag/interface.h>
  35 #include <helper/time_support.h>
  36 #include "bitq.h"
  37
  38
  39 /* PRESTO access library includes */
  40 #if BUILD_PRESTO_FTD2XX == 1
  41 #include <ftd2xx.h>
  42 #include "ftd2xx_common.h"
  43 #elif BUILD_PRESTO_LIBFTDI == 1
  44 #include <ftdi.h>
  45 #else
  46 #error "BUG: either FTD2XX and LIBFTDI has to be used"
  47 #endif
  48
  49 /* -------------------------------------------------------------------------- */
  50
  51 #define FT_DEVICE_NAME_LEN 64
  52 #define FT_DEVICE_SERNUM_LEN 64
  53
  54 #define PRESTO_VID_PID 0x0403f1a0
  55 #define PRESTO_VID (0x0403)
  56 #define PRESTO_PID (0xf1a0)
  57
  58 #define BUFFER_SIZE (64*62)
  59
  60 struct presto {
  61 #if BUILD_PRESTO_FTD2XX == 1
  62         FT_HANDLE handle;
  63         FT_STATUS status;
  64 #elif BUILD_PRESTO_LIBFTDI == 1
  65         struct ftdi_context ftdic;
  66         int retval;
  67 #endif
  68
  69         char serial[FT_DEVICE_SERNUM_LEN];
  70
  71         uint8_t buff_out[BUFFER_SIZE];
  72         int buff_out_pos;
  73
  74         uint8_t buff_in[BUFFER_SIZE];
  75         int buff_in_exp; /* expected in buffer length */
  76         int buff_in_len; /* length of data received */
  77         int buff_in_pos;
  78
  79         unsigned long total_out;
  80         unsigned long total_in;
  81
  82         int jtag_tms; /* last tms state */
  83         int jtag_tck; /* last tck state */
  84         int jtag_rst; /* last trst state */
  85
  86         int jtag_tdi_data;
  87         int jtag_tdi_count;
  88
  89         int jtag_speed;
  90 };
  91
  92 static struct presto presto_state;
  93 static struct presto *presto = &presto_state;
  94
  95 static uint8_t presto_init_seq[] =
  96 {
  97         0x80, 0xA0, 0xA8, 0xB0, 0xC0, 0xE0
  98 };
  99
 100 static int presto_write(uint8_t *buf, uint32_t size)
 101 {
 102 #if BUILD_PRESTO_FTD2XX == 1
 103         DWORD ftbytes;
 104         if ((presto->status = FT_Write(presto->handle, buf, size, &ftbytes)) != FT_OK)
 105         {
 106                 LOG_ERROR("FT_Write returned: %s", ftd2xx_status_string(presto->status));
 107                 return ERROR_JTAG_DEVICE_ERROR;
 108         }
 109
 110 #elif BUILD_PRESTO_LIBFTDI == 1
 111         uint32_t ftbytes;
 112         if ((presto->retval = ftdi_write_data(&presto->ftdic, buf, size)) < 0)
 113         {
 114                 LOG_ERROR("ftdi_write_data: %s", ftdi_get_error_string(&presto->ftdic));
 115                 return ERROR_JTAG_DEVICE_ERROR;
 116         }
 117         ftbytes = presto->retval;
 118 #endif
 119
 120         if (ftbytes != size)
 121         {
 122                 LOG_ERROR("couldn't write the requested number of bytes to PRESTO (%u < %u)",
 123                           (unsigned)ftbytes, (unsigned)size);
 124                 return ERROR_JTAG_DEVICE_ERROR;
 125         }
 126
 127         return ERROR_OK;
 128 }
 129
 130 static int presto_read(uint8_t* buf, uint32_t size)
 131 {
 132 #if BUILD_PRESTO_FTD2XX == 1
 133         DWORD ftbytes;
 134         if ((presto->status = FT_Read(presto->handle, buf, size, &ftbytes)) != FT_OK)
 135         {
 136                 LOG_ERROR("FT_Read returned: %s", ftd2xx_status_string(presto->status));
 137                 return ERROR_JTAG_DEVICE_ERROR;
 138         }
 139
 140 #elif BUILD_PRESTO_LIBFTDI == 1
 141         uint32_t ftbytes = 0;
 142
 143         struct timeval timeout, now;
 144         gettimeofday(&timeout, NULL);
 145         timeval_add_time(&timeout, 1, 0); /* one second timeout */
 146
 147         while (ftbytes < size)
 148         {
 149                 if ((presto->retval = ftdi_read_data(&presto->ftdic, buf + ftbytes, size - ftbytes)) < 0)
 150                 {
 151                         LOG_ERROR("ftdi_read_data: %s", ftdi_get_error_string(&presto->ftdic));
 152                         return ERROR_JTAG_DEVICE_ERROR;
 153                 }
 154                 ftbytes += presto->retval;
 155
 156                 gettimeofday(&now, NULL);
 157                 if ((now.tv_sec > timeout.tv_sec) || ((now.tv_sec == timeout.tv_sec) && (now.tv_usec > timeout.tv_usec)))
 158                         break;
 159         }
 160 #endif
 161
 162         if (ftbytes != size)
 163         {
 164                 /* this is just a warning, there might have been timeout when detecting PRESTO, which is not fatal */
 165                 LOG_WARNING("couldn't read the requested number of bytes from PRESTO (%u < %u)",
 166                             (unsigned)ftbytes, (unsigned)size);
 167                 return ERROR_JTAG_DEVICE_ERROR;
 168         }
 169
 170         return ERROR_OK;
 171 }
 172
 173 #if BUILD_PRESTO_FTD2XX == 1
 174 static int presto_open_ftd2xx(char *req_serial)
 175 {
 176         uint32_t i;
 177         DWORD numdevs;
 178         DWORD vidpid;
 179         char devname[FT_DEVICE_NAME_LEN];
 180         FT_DEVICE device;
 181
 182         BYTE presto_data;
 183         DWORD ftbytes;
 184
 185         presto->handle = (FT_HANDLE)INVALID_HANDLE_VALUE;
 186
 187 #if IS_WIN32 == 0
 188         /* Add non-standard Vid/Pid to the linux driver */
 189         if ((presto->status = FT_SetVIDPID(PRESTO_VID, PRESTO_PID)) != FT_OK)
 190         {
 191                 LOG_ERROR("couldn't add PRESTO VID/PID");
 192                 exit(-1);
 193         }
 194 #endif
 195
 196         if ((presto->status = FT_ListDevices(&numdevs, NULL, FT_LIST_NUMBER_ONLY)) != FT_OK)
 197         {
 198                 LOG_ERROR("FT_ListDevices failed: %s", ftd2xx_status_string(presto->status));
 199                 return ERROR_JTAG_DEVICE_ERROR;
 200         }
 201
 202         LOG_DEBUG("FTDI devices available: %" PRIu32, (uint32_t)numdevs);
 203         for (i = 0; i < numdevs; i++)
 204         {
 205                 if ((presto->status = FT_Open(i, &(presto->handle))) != FT_OK)
 206                 {
 207                         /* this is not fatal, the device may be legitimately open by other process, hence debug message only */
 208                         LOG_DEBUG("FT_Open failed: %s", ftd2xx_status_string(presto->status));
 209                         continue;
 210                 }
 211                 LOG_DEBUG("FTDI device %i open", (int)i);
 212
 213                 if ((presto->status = FT_GetDeviceInfo(presto->handle, &device, &vidpid,
 214                                 presto->serial, devname, NULL)) == FT_OK)
 215                 {
 216                         if (vidpid == PRESTO_VID_PID
 217                                         && (req_serial == NULL || !strcmp(presto->serial, req_serial)))
 218                                 break;
 219                 }
 220                 else
 221                         LOG_DEBUG("FT_GetDeviceInfo failed: %s", ftd2xx_status_string(presto->status));
 222
 223                 LOG_DEBUG("FTDI device %i does not match, closing", (int)i);
 224                 FT_Close(presto->handle);
 225                 presto->handle = (FT_HANDLE)INVALID_HANDLE_VALUE;
 226         }
 227
 228         if (presto->handle == (FT_HANDLE)INVALID_HANDLE_VALUE)
 229                 return ERROR_JTAG_DEVICE_ERROR; /* presto not open, return */
 230
 231         if ((presto->status = FT_SetLatencyTimer(presto->handle, 1)) != FT_OK)
 232                 return ERROR_JTAG_DEVICE_ERROR;
 233
 234
 235         if ((presto->status = FT_SetTimeouts(presto->handle, 100, 0)) != FT_OK)
 236                 return ERROR_JTAG_DEVICE_ERROR;
 237
 238         if ((presto->status = FT_Purge(presto->handle, FT_PURGE_TX | FT_PURGE_RX)) != FT_OK)
 239                 return ERROR_JTAG_DEVICE_ERROR;
 240
 241         presto_data = 0xD0;
 242         if ((presto->status = FT_Write(presto->handle, &presto_data, 1, &ftbytes)) != FT_OK)
 243                 return ERROR_JTAG_DEVICE_ERROR;
 244
 245         /* delay between first write/read turnaround (after purge?) necessary under Linux for unknown reason,
 246            probably a bug in library threading */
 247         usleep(100000);
 248         if ((presto->status = FT_Read(presto->handle, &presto_data, 1, &ftbytes)) != FT_OK)
 249                 return ERROR_JTAG_DEVICE_ERROR;
 250
 251         if (ftbytes != 1)
 252         {
 253                 LOG_DEBUG("PRESTO reset");
 254
 255                 if ((presto->status = FT_Purge(presto->handle, FT_PURGE_TX | FT_PURGE_RX)) != FT_OK)
 256                         return ERROR_JTAG_DEVICE_ERROR;
 257                 if ((presto->status = FT_SetBitMode(presto->handle, 0x80, 1)) != FT_OK)
 258                         return ERROR_JTAG_DEVICE_ERROR;
 259                 if ((presto->status = FT_SetBaudRate(presto->handle, 9600)) != FT_OK)
 260                         return ERROR_JTAG_DEVICE_ERROR;
 261
 262                 presto_data = 0;
 263                 for (i = 0; i < 4 * 62; i++)
 264                         if ((presto->status = FT_Write(presto->handle, &presto_data, 1, &ftbytes)) != FT_OK)
 265                                 return ERROR_JTAG_DEVICE_ERROR;
 266
 267                 usleep(100000);
 268
 269                 if ((presto->status = FT_SetBitMode(presto->handle, 0x00, 0)) != FT_OK)
 270                         return ERROR_JTAG_DEVICE_ERROR;
 271
 272                 if ((presto->status = FT_Purge(presto->handle, FT_PURGE_TX | FT_PURGE_RX)) != FT_OK)
 273                         return ERROR_JTAG_DEVICE_ERROR;
 274
 275                 presto_data = 0xD0;
 276                 if ((presto->status = FT_Write(presto->handle, &presto_data, 1, &ftbytes)) != FT_OK)
 277                         return ERROR_JTAG_DEVICE_ERROR;
 278
 279                 /* delay between first write/read turnaround (after purge?) necessary under Linux for unknown reason,
 280                    probably a bug in library threading */
 281                 usleep(100000);
 282                 if ((presto->status = FT_Read(presto->handle, &presto_data, 1, &ftbytes)) != FT_OK)
 283                         return ERROR_JTAG_DEVICE_ERROR;
 284
 285                 if (ftbytes != 1)
 286                 {
 287                         LOG_DEBUG("PRESTO not responding");
 288                         return ERROR_JTAG_DEVICE_ERROR;
 289                 }
 290         }
 291
 292         if ((presto->status = FT_SetTimeouts(presto->handle, 0, 0)) != FT_OK)
 293                 return ERROR_JTAG_DEVICE_ERROR;
 294
 295
 296         presto->status = FT_Write(presto->handle, &presto_init_seq, sizeof(presto_init_seq), &ftbytes);
 297         if (presto->status != FT_OK || ftbytes != sizeof(presto_init_seq))
 298                 return ERROR_JTAG_DEVICE_ERROR;
 299
 300         return ERROR_OK;
 301 }
 302
 303 #elif BUILD_PRESTO_LIBFTDI == 1
 304 static int presto_open_libftdi(char *req_serial)
 305 {
 306         uint8_t presto_data;
 307
 308         LOG_DEBUG("searching for PRESTO using libftdi");
 309
 310         /* initialize FTDI context structure */
 311         if (ftdi_init(&presto->ftdic) < 0)
 312         {
 313                 LOG_ERROR("unable to init libftdi: %s", presto->ftdic.error_str);
 314                 return ERROR_JTAG_DEVICE_ERROR;
 315         }
 316
 317         /* context, vendor id, product id */
 318         if (ftdi_usb_open_desc(&presto->ftdic, PRESTO_VID, PRESTO_PID, NULL, req_serial) < 0)
 319         {
 320                 LOG_ERROR("unable to open PRESTO: %s", presto->ftdic.error_str);
 321                 return ERROR_JTAG_DEVICE_ERROR;
 322         }
 323
 324         if (ftdi_usb_reset(&presto->ftdic) < 0)
 325         {
 326                 LOG_ERROR("unable to reset PRESTO device");
 327                 return ERROR_JTAG_DEVICE_ERROR;
 328         }
 329
 330         if (ftdi_set_latency_timer(&presto->ftdic, 1) < 0)
 331         {
 332                 LOG_ERROR("unable to set latency timer");
 333                 return ERROR_JTAG_DEVICE_ERROR;
 334         }
 335
 336         if (ftdi_usb_purge_buffers(&presto->ftdic) < 0)
 337         {
 338                 LOG_ERROR("unable to purge PRESTO buffers");
 339                 return ERROR_JTAG_DEVICE_ERROR;
 340         }
 341
 342         presto_data = 0xD0;
 343         if (presto_write(&presto_data, 1) != ERROR_OK)
 344         {
 345                 LOG_ERROR("error writing to PRESTO");
 346                 return ERROR_JTAG_DEVICE_ERROR;
 347         }
 348
 349         if (presto_read(&presto_data, 1) != ERROR_OK)
 350         {
 351                 LOG_DEBUG("no response from PRESTO, retrying");
 352
 353                 if (ftdi_usb_purge_buffers(&presto->ftdic) < 0)
 354                         return ERROR_JTAG_DEVICE_ERROR;
 355
 356                 presto_data = 0xD0;
 357                 if (presto_write(&presto_data, 1) != ERROR_OK)
 358                         return ERROR_JTAG_DEVICE_ERROR;
 359
 360                 if (presto_read(&presto_data, 1) != ERROR_OK)
 361                 {
 362                         LOG_ERROR("no response from PRESTO, giving up");
 363                         return ERROR_JTAG_DEVICE_ERROR;
 364                 }
 365         }
 366
 367         if (presto_write(presto_init_seq, sizeof(presto_init_seq)) != ERROR_OK)
 368         {
 369                 LOG_ERROR("error writing PRESTO init sequence");
 370                 return ERROR_JTAG_DEVICE_ERROR;
 371         }
 372
 373         return ERROR_OK;
 374 }
 375 #endif /* BUILD_PRESTO_LIBFTDI == 1 */
 376
 377 static int presto_open(char *req_serial)
 378 {
 379         presto->buff_out_pos = 0;
 380         presto->buff_in_pos = 0;
 381         presto->buff_in_len = 0;
 382         presto->buff_in_exp = 0;
 383
 384         presto->total_out = 0;
 385         presto->total_in = 0;
 386
 387         presto->jtag_tms = 0;
 388         presto->jtag_tck = 0;
 389         presto->jtag_rst = 0;
 390         presto->jtag_tdi_data = 0;
 391         presto->jtag_tdi_count = 0;
 392
 393         presto->jtag_speed = 0;
 394
 395 #if BUILD_PRESTO_FTD2XX == 1
 396         return presto_open_ftd2xx(req_serial);
 397 #elif BUILD_PRESTO_LIBFTDI == 1
 398         return presto_open_libftdi(req_serial);
 399 #endif
 400 }
 401
 402 static int presto_close(void)
 403 {
 404
 405         int result = ERROR_OK;
 406
 407 #if BUILD_PRESTO_FTD2XX == 1
 408         DWORD ftbytes;
 409
 410         if (presto->handle == (FT_HANDLE)INVALID_HANDLE_VALUE)
 411                 return result;
 412
 413         presto->status = FT_Purge(presto->handle, FT_PURGE_TX | FT_PURGE_RX);
 414         if (presto->status != FT_OK)
 415                 result = ERROR_JTAG_DEVICE_ERROR;
 416
 417         presto->status = FT_Write(presto->handle, &presto_init_seq, sizeof(presto_init_seq), &ftbytes);
 418         if (presto->status != FT_OK || ftbytes != sizeof(presto_init_seq))
 419                 result = ERROR_JTAG_DEVICE_ERROR;
 420
 421         if ((presto->status = FT_SetLatencyTimer(presto->handle, 16)) != FT_OK)
 422                 result = ERROR_JTAG_DEVICE_ERROR;
 423
 424         if ((presto->status = FT_Close(presto->handle)) != FT_OK)
 425                 result = ERROR_JTAG_DEVICE_ERROR;
 426         else
 427                 presto->handle = (FT_HANDLE)INVALID_HANDLE_VALUE;
 428
 429 #elif BUILD_PRESTO_LIBFTDI == 1
 430
 431         if ((presto->retval = ftdi_write_data(&presto->ftdic, presto_init_seq, sizeof(presto_init_seq))) != sizeof(presto_init_seq))
 432                 result = ERROR_JTAG_DEVICE_ERROR;
 433
 434         if ((presto->retval = ftdi_set_latency_timer(&presto->ftdic, 16)) < 0)
 435                 result = ERROR_JTAG_DEVICE_ERROR;
 436
 437         if ((presto->retval = ftdi_usb_close(&presto->ftdic)) < 0)
 438                 result = ERROR_JTAG_DEVICE_ERROR;
 439         else
 440                 ftdi_deinit(&presto->ftdic);
 441 #endif
 442
 443         return result;
 444 }
 445
 446 static int presto_flush(void)
 447 {
 448         if (presto->buff_out_pos == 0)
 449                 return ERROR_OK;
 450
 451 #if BUILD_PRESTO_FTD2XX == 1
 452         if (presto->status != FT_OK)
 453 #elif BUILD_PRESTO_LIBFTDI == 1
 454         if (presto->retval < 0)
 455 #endif
 456         {
 457                 LOG_DEBUG("error in previous communication, canceling I/O operation");
 458                 return ERROR_JTAG_DEVICE_ERROR;
 459         }
 460
 461         if (presto_write(presto->buff_out, presto->buff_out_pos) != ERROR_OK)
 462         {
 463                 presto->buff_out_pos = 0;
 464                 return ERROR_JTAG_DEVICE_ERROR;
 465         }
 466
 467         presto->total_out += presto->buff_out_pos;
 468         presto->buff_out_pos = 0;
 469
 470         if (presto->buff_in_exp == 0)
 471                 return ERROR_OK;
 472
 473         presto->buff_in_pos = 0;
 474         presto->buff_in_len = 0;
 475
 476         if (presto_read(presto->buff_in, presto->buff_in_exp) != ERROR_OK)
 477         {
 478                 presto->buff_in_exp = 0;
 479                 return ERROR_JTAG_DEVICE_ERROR;
 480         }
 481
 482         presto->total_in += presto->buff_in_exp;
 483         presto->buff_in_len = presto->buff_in_exp;
 484         presto->buff_in_exp = 0;
 485
 486         return ERROR_OK;
 487 }
 488
 489 static int presto_sendbyte(int data)
 490 {
 491         if (data == EOF) return presto_flush();
 492
 493         if (presto->buff_out_pos < BUFFER_SIZE)
 494         {
 495                 presto->buff_out[presto->buff_out_pos++] = (uint8_t)data;
 496                 if (((data & 0xC0) == 0x40) || ((data & 0xD0)== 0xD0))
 497                         presto->buff_in_exp++;
 498         }
 499         else
 500                 return ERROR_JTAG_DEVICE_ERROR;
 501
 502 #if BUILD_PRESTO_FTD2XX == 1
 503         if (presto->buff_out_pos >= BUFFER_SIZE)
 504 #elif BUILD_PRESTO_LIBFTDI == 1
 505         /* libftdi does not do background read, be sure that USB IN buffer does not overflow (128 bytes only!) */
 506         if (presto->buff_out_pos >= BUFFER_SIZE || presto->buff_in_exp == 128)
 507 #endif
 508                 return presto_flush();
 509
 510         return ERROR_OK;
 511 }
 512
 513 #if 0
 514 static int presto_getbyte(void)
 515 {
 516         if (presto->buff_in_pos < presto->buff_in_len)
 517                 return presto->buff_in[presto->buff_in_pos++];
 518
 519         if (presto->buff_in_exp == 0)
 520                 return -1;
 521
 522         if (presto_flush() != ERROR_OK)
 523                 return -1;
 524
 525         if (presto->buff_in_pos < presto->buff_in_len)
 526                 return presto->buff_in[presto->buff_in_pos++];
 527
 528         return -1;
 529 }
 530 #endif
 531
 532 /* -------------------------------------------------------------------------- */
 533
 534 static int presto_tdi_flush(void)
 535 {
 536         if (presto->jtag_tdi_count == 0)
 537                 return 0;
 538
 539         if (presto->jtag_tck == 0)
 540         {
 541                 LOG_ERROR("BUG: unexpected TAP condition, TCK low");
 542                 return -1;
 543         }
 544
 545         presto->jtag_tdi_data |= (presto->jtag_tdi_count - 1) << 4;
 546         presto_sendbyte(presto->jtag_tdi_data);
 547         presto->jtag_tdi_count = 0;
 548         presto->jtag_tdi_data = 0;
 549
 550         return 0;
 551 }
 552
 553 static int presto_tck_idle(void)
 554 {
 555         if (presto->jtag_tck == 1)
 556         {
 557                 presto_sendbyte(0xCA);
 558                 presto->jtag_tck = 0;
 559         }
 560
 561         return 0;
 562 }
 563
 564 /* -------------------------------------------------------------------------- */
 565
 566 static int presto_bitq_out(int tms, int tdi, int tdo_req)
 567 {
 568         int i;
 569         unsigned char cmd;
 570
 571         if (presto->jtag_tck == 0)
 572         {
 573                 presto_sendbyte(0xA4); /* LED idicator - JTAG active */
 574         }
 575         else if (presto->jtag_speed == 0 && !tdo_req && tms == presto->jtag_tms)
 576         {
 577                 presto->jtag_tdi_data |= (tdi != 0) << presto->jtag_tdi_count;
 578
 579                 if (++presto->jtag_tdi_count == 4)
 580                         presto_tdi_flush();
 581
 582                 return 0;
 583         }
 584
 585         presto_tdi_flush();
 586
 587         cmd = tdi ? 0xCB : 0xCA;
 588         presto_sendbyte(cmd);
 589
 590         if (tms != presto->jtag_tms)
 591         {
 592                 presto_sendbyte((tms ? 0xEC : 0xE8) | (presto->jtag_rst ? 0x02 : 0));
 593                 presto->jtag_tms = tms;
 594         }
 595
 596         /* delay with TCK low */
 597         for (i = presto->jtag_speed; i > 1; i--)
 598                 presto_sendbyte(cmd);
 599
 600         cmd |= 0x04;
 601         presto_sendbyte(cmd | (tdo_req ? 0x10 : 0));
 602
 603         /* delay with TCK high */
 604         for (i = presto->jtag_speed; i > 1; i--)
 605                 presto_sendbyte(cmd);
 606
 607         presto->jtag_tck = 1;
 608
 609         return 0;
 610 }
 611
 612 static int presto_bitq_flush(void)
 613 {
 614         presto_tdi_flush();
 615         presto_tck_idle();
 616
 617         presto_sendbyte(0xA0); /* LED idicator - JTAG idle */
 618
 619         return presto_flush();
 620 }
 621
 622 static int presto_bitq_in_rdy(void)
 623 {
 624         if (presto->buff_in_pos >= presto->buff_in_len)
 625                 return 0;
 626         return presto->buff_in_len-presto->buff_in_pos;
 627 }
 628
 629 static int presto_bitq_in(void)
 630 {
 631         if (presto->buff_in_pos >= presto->buff_in_len)
 632                 return -1;
 633         if (presto->buff_in[presto->buff_in_pos++]&0x08) return 1;
 634         return 0;
 635 }
 636
 637 static int presto_bitq_sleep(unsigned long us)
 638 {
 639         long waits;
 640
 641         presto_tdi_flush();
 642         presto_tck_idle();
 643
 644         if (us > 100000)
 645         {
 646                 presto_bitq_flush();
 647                 jtag_sleep(us);
 648                 return 0;
 649         }
 650
 651         waits = us / 170 + 2;
 652         while (waits--)
 653                 presto_sendbyte(0x80);
 654
 655         return 0;
 656 }
 657
 658 static int presto_bitq_reset(int trst, int srst)
 659 {
 660         presto_tdi_flush();
 661         presto_tck_idle();
 662
 663         /* add a delay after possible TCK transition */
 664         presto_sendbyte(0x80);
 665         presto_sendbyte(0x80);
 666
 667         presto->jtag_rst = trst || srst;
 668         presto_sendbyte((presto->jtag_rst ? 0xEA : 0xE8) | (presto->jtag_tms ? 0x04 : 0));
 669
 670         return 0;
 671 }
 672
 673 static struct bitq_interface presto_bitq = {
 674                 .out = &presto_bitq_out,
 675                 .flush = &presto_bitq_flush,
 676                 .sleep = &presto_bitq_sleep,
 677                 .reset = &presto_bitq_reset,
 678                 .in_rdy = &presto_bitq_in_rdy,
 679                 .in = &presto_bitq_in,
 680         };
 681
 682 /* -------------------------------------------------------------------------- */
 683
 684 static int presto_adapter_khz(int khz, int *jtag_speed)
 685 {
 686         if (khz < 0)
 687         {
 688                 *jtag_speed = 0;
 689                 return ERROR_COMMAND_SYNTAX_ERROR;
 690         }
 691
 692         if (khz >= 3000) *jtag_speed = 0;
 693         else *jtag_speed = (1000 + khz-1)/khz;
 694
 695         return 0;
 696 }
 697
 698 static int presto_jtag_speed_div(int speed, int *khz)
 699 {
 700         if ((speed < 0) || (speed > 1000))
 701         {
 702                 *khz = 0;
 703                 return ERROR_COMMAND_SYNTAX_ERROR;
 704         }
 705
 706         if (speed == 0) *khz = 3000;
 707         else *khz = 1000/speed;
 708
 709         return 0;
 710 }
 711
 712 static int presto_jtag_speed(int speed)
 713 {
 714         int khz;
 715
 716         if (presto_jtag_speed_div(speed, &khz))
 717         {
 718                 return ERROR_COMMAND_SYNTAX_ERROR;
 719         }
 720
 721         presto->jtag_speed = speed;
 722
 723         if (khz%1000 == 0)
 724                 LOG_INFO("setting speed to %d, max. TCK freq. is %d MHz", speed, khz/1000);
 725         else
 726                 LOG_INFO("setting speed to %d, max. TCK freq. is %d kHz", speed, khz);
 727
 728         return 0;
 729 }
 730
 731 static char *presto_serial;
 732
 733 COMMAND_HANDLER(presto_handle_serial_command)
 734 {
 735         if (CMD_ARGC == 1)
 736         {
 737                 if (presto_serial)
 738                         free(presto_serial);
 739                 presto_serial = strdup(CMD_ARGV[0]);
 740         }
 741         else
 742         {
 743                 LOG_ERROR("expected exactly one argument to presto_serial <serial-number>");
 744         }
 745
 746         return ERROR_OK;
 747 }
 748
 749 static const struct command_registration presto_command_handlers[] = {
 750         {
 751                 .name = "presto_serial",
 752                 .handler = presto_handle_serial_command,
 753                 .mode = COMMAND_CONFIG,
 754                 .help = "Configure USB serial number of Presto device.",
 755                 .usage = "serial_string",
 756         },
 757         COMMAND_REGISTRATION_DONE
 758 };
 759
 760 static int presto_jtag_init(void)
 761 {
 762         if (presto_open(presto_serial) != ERROR_OK)
 763         {
 764                 presto_close();
 765                 if (presto_serial != NULL)
 766                         LOG_ERROR("Cannot open PRESTO, serial number '%s'", presto_serial);
 767                 else
 768                         LOG_ERROR("Cannot open PRESTO");
 769                 return ERROR_JTAG_INIT_FAILED;
 770         }
 771         LOG_INFO("PRESTO open, serial number '%s'", presto->serial);
 772
 773         bitq_interface = &presto_bitq;
 774         return ERROR_OK;
 775 }
 776
 777 static int presto_jtag_quit(void)
 778 {
 779         bitq_cleanup();
 780         presto_close();
 781         LOG_INFO("PRESTO closed");
 782
 783         if (presto_serial)
 784         {
 785                 free(presto_serial);
 786                 presto_serial = NULL;
 787         }
 788
 789         return ERROR_OK;
 790 }
 791
 792 struct jtag_interface presto_interface = {
 793         .name = "presto",
 794         .commands = presto_command_handlers,
 795
 796         .execute_queue = bitq_execute_queue,
 797         .speed = presto_jtag_speed,
 798         .khz = presto_adapter_khz,
 799         .speed_div = presto_jtag_speed_div,
 800         .init = presto_jtag_init,
 801         .quit = presto_jtag_quit,
 802 };