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