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   1 /***************************************************************************
   2  *   Copyright (C) 2010 Serge Vakulenko                                    *
   3  *   serge@vak.ru                                                          *
   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, see <http://www.gnu.org/licenses/>. *
  17  ***************************************************************************/
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22
  23 #if IS_CYGWIN == 1
  24 #include "windows.h"
  25 #undef LOG_ERROR
  26 #endif
  27
  28 /* project specific includes */
  29 #include <jtag/interface.h>
  30 #include <jtag/commands.h>
  31 #include <helper/time_support.h>
  32 #include "libusb1_common.h"
  33
  34 /* system includes */
  35 #include <string.h>
  36 #include <stdlib.h>
  37 #include <unistd.h>
  38 #include <sys/time.h>
  39 #include <time.h>
  40
  41 /*
  42  * Sync bit bang mode is implemented as described in FTDI Application
  43  * Note AN232R-01: "Bit Bang Modes for the FT232R and FT245R".
  44  */
  45
  46 /*
  47  * USB endpoints.
  48  */
  49 #define IN_EP                   0x02
  50 #define OUT_EP                  0x81
  51
  52 /* Requests */
  53 #define SIO_RESET               0 /* Reset the port */
  54 #define SIO_MODEM_CTRL          1 /* Set the modem control register */
  55 #define SIO_SET_FLOW_CTRL       2 /* Set flow control register */
  56 #define SIO_SET_BAUD_RATE       3 /* Set baud rate */
  57 #define SIO_SET_DATA            4 /* Set the data characteristics of the port */
  58 #define SIO_POLL_MODEM_STATUS   5
  59 #define SIO_SET_EVENT_CHAR      6
  60 #define SIO_SET_ERROR_CHAR      7
  61 #define SIO_SET_LATENCY_TIMER   9
  62 #define SIO_GET_LATENCY_TIMER   10
  63 #define SIO_SET_BITMODE         11
  64 #define SIO_READ_PINS           12
  65 #define SIO_READ_EEPROM         0x90
  66 #define SIO_WRITE_EEPROM        0x91
  67 #define SIO_ERASE_EEPROM        0x92
  68
  69 #define FT232R_BUF_SIZE_EXTRA   4096
  70
  71 static char *ft232r_serial_desc;
  72 static uint16_t ft232r_vid = 0x0403; /* FTDI */
  73 static uint16_t ft232r_pid = 0x6001; /* FT232R */
  74 static jtag_libusb_device_handle *adapter;
  75
  76 static uint8_t *ft232r_output;
  77 static size_t ft232r_output_len;
  78
  79 /**
  80  * FT232R GPIO bit number to RS232 name
  81  */
  82 #define FT232R_BIT_COUNT 8
  83 static char *ft232r_bit_name_array[FT232R_BIT_COUNT] = {
  84         "TXD", /* 0: pin 1  TCK output */
  85         "RXD", /* 1: pin 5  TDI output */
  86         "RTS", /* 2: pin 3  TDO input */
  87         "CTS", /* 3: pin 11 TMS output */
  88         "DTR", /* 4: pin 2  /TRST output */
  89         "DSR", /* 5: pin 9  unused */
  90         "DCD", /* 6: pin 10 /SYSRST output */
  91         "RI"   /* 7: pin 6  unused */
  92 };
  93
  94 static int tck_gpio; /* initialized to 0 by default */
  95 static int tdi_gpio = 1;
  96 static int tdo_gpio = 2;
  97 static int tms_gpio = 3;
  98 static int ntrst_gpio = 4;
  99 static int nsysrst_gpio = 6;
 100 static size_t ft232r_buf_size = FT232R_BUF_SIZE_EXTRA;
 101 /** 0xFFFF disables restore by default, after exit serial port will not work.
 102  *  0x15 sets TXD RTS DTR as outputs, after exit serial port will continue to work.
 103  */
 104 static uint16_t ft232r_restore_bitmode = 0xFFFF;
 105
 106 /**
 107  * Perform sync bitbang output/input transaction.
 108  * Before call, an array ft232r_output[] should be filled with data to send.
 109  * Counter ft232r_output_len contains the number of bytes to send.
 110  * On return, received data is put back to array ft232r_output[].
 111  */
 112 static int ft232r_send_recv(void)
 113 {
 114         /* FIFO TX buffer has 128 bytes.
 115          * FIFO RX buffer has 256 bytes.
 116          * First two bytes of received packet contain contain modem
 117          * and line status and are ignored.
 118          * Unfortunately, transfer sizes bigger than 64 bytes
 119          * frequently cause hang ups. */
 120         assert(ft232r_output_len > 0);
 121
 122         size_t total_written = 0;
 123         size_t total_read = 0;
 124         int rxfifo_free = 128;
 125
 126         while (total_read < ft232r_output_len) {
 127                 /* Write */
 128                 int bytes_to_write = ft232r_output_len - total_written;
 129                 if (bytes_to_write > 64)
 130                         bytes_to_write = 64;
 131                 if (bytes_to_write > rxfifo_free)
 132                         bytes_to_write = rxfifo_free;
 133
 134                 if (bytes_to_write) {
 135                         int n;
 136
 137                         if (jtag_libusb_bulk_write(adapter, IN_EP,
 138                                                    (char *) ft232r_output + total_written,
 139                                                    bytes_to_write, 1000, &n) != ERROR_OK) {
 140                                 LOG_ERROR("usb bulk write failed");
 141                                 return ERROR_JTAG_DEVICE_ERROR;
 142                         }
 143
 144                         total_written += n;
 145                         rxfifo_free -= n;
 146                 }
 147
 148                 /* Read */
 149                 uint8_t reply[64];
 150                 int n;
 151
 152                 if (jtag_libusb_bulk_read(adapter, OUT_EP, (char *) reply,
 153                                           sizeof(reply), 1000, &n) != ERROR_OK) {
 154                         LOG_ERROR("usb bulk read failed");
 155                         return ERROR_JTAG_DEVICE_ERROR;
 156                 }
 157                 if (n > 2) {
 158                         /* Copy data, ignoring first 2 bytes. */
 159                         memcpy(ft232r_output + total_read, reply + 2, n - 2);
 160                         int bytes_read = n - 2;
 161                         total_read += bytes_read;
 162                         rxfifo_free += bytes_read;
 163                         if (total_read > total_written) {
 164                                 LOG_ERROR("read more bytes than wrote");
 165                                 return ERROR_JTAG_DEVICE_ERROR;
 166                         }
 167                 }
 168         }
 169         ft232r_output_len = 0;
 170         return ERROR_OK;
 171 }
 172
 173 void ft232r_increase_buf_size(size_t new_buf_size)
 174 {
 175         uint8_t *new_buf_ptr;
 176         if (new_buf_size >= ft232r_buf_size) {
 177                 new_buf_size += FT232R_BUF_SIZE_EXTRA;
 178                 new_buf_ptr = realloc(ft232r_output, new_buf_size);
 179                 if (new_buf_ptr != NULL) {
 180                         ft232r_output = new_buf_ptr;
 181                         ft232r_buf_size = new_buf_size;
 182                 }
 183         }
 184 }
 185
 186 /**
 187  * Add one TCK/TMS/TDI sample to send buffer.
 188  */
 189 static void ft232r_write(int tck, int tms, int tdi)
 190 {
 191         unsigned out_value = (1<<ntrst_gpio) | (1<<nsysrst_gpio);
 192         if (tck)
 193                 out_value |= (1<<tck_gpio);
 194         if (tms)
 195                 out_value |= (1<<tms_gpio);
 196         if (tdi)
 197                 out_value |= (1<<tdi_gpio);
 198
 199         ft232r_increase_buf_size(ft232r_output_len);
 200
 201         if (ft232r_output_len >= ft232r_buf_size) {
 202                 /* FIXME: should we just execute queue here? */
 203                 LOG_ERROR("ft232r_write: buffer overflow");
 204                 return;
 205         }
 206         ft232r_output[ft232r_output_len++] = out_value;
 207 }
 208
 209 /**
 210  * Control /TRST and /SYSRST pins.
 211  * Perform immediate bitbang transaction.
 212  */
 213 static void ft232r_reset(int trst, int srst)
 214 {
 215         unsigned out_value = (1<<ntrst_gpio) | (1<<nsysrst_gpio);
 216         LOG_DEBUG("ft232r_reset(%d,%d)", trst, srst);
 217
 218         if (trst == 1)
 219                 out_value &= ~(1<<ntrst_gpio);          /* switch /TRST low */
 220         else if (trst == 0)
 221                 out_value |= (1<<ntrst_gpio);                   /* switch /TRST high */
 222
 223         if (srst == 1)
 224                 out_value &= ~(1<<nsysrst_gpio);                /* switch /SYSRST low */
 225         else if (srst == 0)
 226                 out_value |= (1<<nsysrst_gpio);         /* switch /SYSRST high */
 227
 228         ft232r_increase_buf_size(ft232r_output_len);
 229
 230         if (ft232r_output_len >= ft232r_buf_size) {
 231                 /* FIXME: should we just execute queue here? */
 232                 LOG_ERROR("ft232r_write: buffer overflow");
 233                 return;
 234         }
 235
 236         ft232r_output[ft232r_output_len++] = out_value;
 237         ft232r_send_recv();
 238 }
 239
 240 static int ft232r_speed(int divisor)
 241 {
 242         int baud = (divisor == 0) ? 3000000 :
 243                 (divisor == 1) ? 2000000 :
 244                 3000000 / divisor;
 245         LOG_DEBUG("ft232r_speed(%d) rate %d bits/sec", divisor, baud);
 246
 247         if (jtag_libusb_control_transfer(adapter,
 248                 LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_OUT,
 249                 SIO_SET_BAUD_RATE, divisor, 0, 0, 0, 1000) != 0) {
 250                 LOG_ERROR("cannot set baud rate");
 251                 return ERROR_JTAG_DEVICE_ERROR;
 252         }
 253         return ERROR_OK;
 254 }
 255
 256 static int ft232r_init(void)
 257 {
 258         uint16_t avids[] = {ft232r_vid, 0};
 259         uint16_t apids[] = {ft232r_pid, 0};
 260         if (jtag_libusb_open(avids, apids, ft232r_serial_desc, &adapter)) {
 261                 LOG_ERROR("ft232r not found: vid=%04x, pid=%04x, serial=%s\n",
 262                         ft232r_vid, ft232r_pid, (ft232r_serial_desc == NULL) ? "[any]" : ft232r_serial_desc);
 263                 return ERROR_JTAG_INIT_FAILED;
 264         }
 265
 266         if (ft232r_restore_bitmode == 0xFFFF) /* serial port will not be restored after jtag: */
 267                 libusb_detach_kernel_driver(adapter, 0);
 268         else /* serial port will be restored after jtag: */
 269                 libusb_set_auto_detach_kernel_driver(adapter, 1); /* 1: DONT_DETACH_SIO_MODULE */
 270
 271         if (jtag_libusb_claim_interface(adapter, 0)) {
 272                 LOG_ERROR("unable to claim interface");
 273                 return ERROR_JTAG_INIT_FAILED;
 274         }
 275
 276         /* Reset the device. */
 277         if (jtag_libusb_control_transfer(adapter,
 278                 LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_OUT,
 279                 SIO_RESET, 0, 0, 0, 0, 1000) != 0) {
 280                 LOG_ERROR("unable to reset device");
 281                 return ERROR_JTAG_INIT_FAILED;
 282         }
 283
 284         /* Sync bit bang mode. */
 285         if (jtag_libusb_control_transfer(adapter,
 286                 LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_OUT,
 287                 SIO_SET_BITMODE, (1<<tck_gpio) | (1<<tdi_gpio) | (1<<tms_gpio) | (1<<ntrst_gpio) | (1<<nsysrst_gpio) | 0x400,
 288                 0, 0, 0, 1000) != 0) {
 289                 LOG_ERROR("cannot set sync bitbang mode");
 290                 return ERROR_JTAG_INIT_FAILED;
 291         }
 292
 293         /* Exactly 500 nsec between updates. */
 294         unsigned divisor = 1;
 295         unsigned char latency_timer = 1;
 296
 297         /* Frequency divisor is 14-bit non-zero value. */
 298         if (jtag_libusb_control_transfer(adapter,
 299                 LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_OUT,
 300                 SIO_SET_BAUD_RATE, divisor,
 301                 0, 0, 0, 1000) != 0) {
 302                 LOG_ERROR("cannot set baud rate");
 303                 return ERROR_JTAG_INIT_FAILED;
 304         }
 305         if (jtag_libusb_control_transfer(adapter,
 306                 LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_OUT,
 307                 SIO_SET_LATENCY_TIMER, latency_timer, 0, 0, 0, 1000) != 0) {
 308                 LOG_ERROR("unable to set latency timer");
 309                 return ERROR_JTAG_INIT_FAILED;
 310         }
 311
 312         ft232r_output = malloc(ft232r_buf_size);
 313         if (ft232r_output == NULL) {
 314                 LOG_ERROR("Unable to allocate memory for the buffer");
 315                 return ERROR_JTAG_INIT_FAILED;
 316         }
 317
 318         return ERROR_OK;
 319 }
 320
 321 static int ft232r_quit(void)
 322 {
 323         /* to restore serial port: set TXD RTS DTR as outputs, others as inputs, disable sync bit bang mode. */
 324         if (ft232r_restore_bitmode != 0xFFFF) {
 325                 if (jtag_libusb_control_transfer(adapter,
 326                         LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_OUT,
 327                         SIO_SET_BITMODE, ft232r_restore_bitmode,
 328                         0, 0, 0, 1000) != 0) {
 329                         LOG_ERROR("cannot set bitmode to restore serial port");
 330                 }
 331         }
 332
 333         if (jtag_libusb_release_interface(adapter, 0) != 0)
 334                 LOG_ERROR("usb release interface failed");
 335
 336         jtag_libusb_close(adapter);
 337
 338         free(ft232r_output); /* free used memory */
 339         ft232r_output = NULL; /* reset pointer to memory */
 340         ft232r_buf_size = FT232R_BUF_SIZE_EXTRA; /* reset next initial buffer size */
 341
 342         return ERROR_OK;
 343 }
 344
 345 static int ft232r_speed_div(int divisor, int *khz)
 346 {
 347         /* Maximum 3 Mbaud for bit bang mode. */
 348         if (divisor == 0)
 349                 *khz = 3000;
 350         else if (divisor == 1)
 351                 *khz = 2000;
 352         else
 353                 *khz = 3000 / divisor;
 354         return ERROR_OK;
 355 }
 356
 357 static int ft232r_khz(int khz, int *divisor)
 358 {
 359         if (khz == 0) {
 360                 LOG_DEBUG("RCLK not supported");
 361                 return ERROR_FAIL;
 362         }
 363
 364         /* Calculate frequency divisor. */
 365         if (khz > 2500)
 366                 *divisor = 0;           /* Special case: 3 MHz */
 367         else if (khz > 1700)
 368                 *divisor = 1;           /* Special case: 2 MHz */
 369         else {
 370                 *divisor = (2*3000 / khz + 1) / 2;
 371                 if (*divisor > 0x3FFF)
 372                         *divisor = 0x3FFF;
 373         }
 374         return ERROR_OK;
 375 }
 376
 377 static char *ft232r_bit_number_to_name(int bit)
 378 {
 379         if (bit >= 0 && bit < FT232R_BIT_COUNT)
 380                 return ft232r_bit_name_array[bit];
 381         return "?";
 382 }
 383
 384 static int ft232r_bit_name_to_number(const char *name)
 385 {
 386         int i;
 387         if (name[0] >= '0' && name[0] <= '9' && name[1] == '\0') {
 388                 i = atoi(name);
 389                 if (i >= 0 && i < FT232R_BIT_COUNT)
 390                         return i;
 391         }
 392         for (i = 0; i < FT232R_BIT_COUNT; i++)
 393                 if (strcasecmp(name, ft232r_bit_name_array[i]) == 0)
 394                         return i;
 395         return -1;
 396 }
 397
 398 COMMAND_HANDLER(ft232r_handle_serial_desc_command)
 399 {
 400         if (CMD_ARGC == 1)
 401                 ft232r_serial_desc = strdup(CMD_ARGV[0]);
 402         else
 403                 LOG_ERROR("require exactly one argument to "
 404                                   "ft232r_serial_desc <serial>");
 405         return ERROR_OK;
 406 }
 407
 408 COMMAND_HANDLER(ft232r_handle_vid_pid_command)
 409 {
 410         if (CMD_ARGC > 2) {
 411                 LOG_WARNING("ignoring extra IDs in ft232r_vid_pid "
 412                                         "(maximum is 1 pair)");
 413                 CMD_ARGC = 2;
 414         }
 415         if (CMD_ARGC == 2) {
 416                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], ft232r_vid);
 417                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[1], ft232r_pid);
 418         } else
 419                 LOG_WARNING("incomplete ft232r_vid_pid configuration");
 420
 421         return ERROR_OK;
 422 }
 423
 424 COMMAND_HANDLER(ft232r_handle_jtag_nums_command)
 425 {
 426         if (CMD_ARGC == 4) {
 427                 tck_gpio = ft232r_bit_name_to_number(CMD_ARGV[0]);
 428                 tms_gpio = ft232r_bit_name_to_number(CMD_ARGV[1]);
 429                 tdi_gpio = ft232r_bit_name_to_number(CMD_ARGV[2]);
 430                 tdo_gpio = ft232r_bit_name_to_number(CMD_ARGV[3]);
 431         } else if (CMD_ARGC != 0)
 432                 return ERROR_COMMAND_SYNTAX_ERROR;
 433
 434         if (tck_gpio < 0)
 435                 return ERROR_COMMAND_SYNTAX_ERROR;
 436         if (tms_gpio < 0)
 437                 return ERROR_COMMAND_SYNTAX_ERROR;
 438         if (tdi_gpio < 0)
 439                 return ERROR_COMMAND_SYNTAX_ERROR;
 440         if (tdo_gpio < 0)
 441                 return ERROR_COMMAND_SYNTAX_ERROR;
 442
 443         command_print(CMD,
 444                         "FT232R nums: TCK = %d %s, TMS = %d %s, TDI = %d %s, TDO = %d %s",
 445                         tck_gpio, ft232r_bit_number_to_name(tck_gpio),
 446                         tms_gpio, ft232r_bit_number_to_name(tms_gpio),
 447                         tdi_gpio, ft232r_bit_number_to_name(tdi_gpio),
 448                         tdo_gpio, ft232r_bit_number_to_name(tdo_gpio));
 449
 450         return ERROR_OK;
 451 }
 452
 453 COMMAND_HANDLER(ft232r_handle_tck_num_command)
 454 {
 455         if (CMD_ARGC == 1)
 456                 tck_gpio = ft232r_bit_name_to_number(CMD_ARGV[0]);
 457         else if (CMD_ARGC != 0)
 458                 return ERROR_COMMAND_SYNTAX_ERROR;
 459
 460         if (tck_gpio < 0)
 461                 return ERROR_COMMAND_SYNTAX_ERROR;
 462
 463         command_print(CMD,
 464                         "FT232R num: TCK = %d %s", tck_gpio, ft232r_bit_number_to_name(tck_gpio));
 465
 466         return ERROR_OK;
 467 }
 468
 469 COMMAND_HANDLER(ft232r_handle_tms_num_command)
 470 {
 471         if (CMD_ARGC == 1)
 472                 tms_gpio = ft232r_bit_name_to_number(CMD_ARGV[0]);
 473         else if (CMD_ARGC != 0)
 474                 return ERROR_COMMAND_SYNTAX_ERROR;
 475
 476         if (tms_gpio < 0)
 477                 return ERROR_COMMAND_SYNTAX_ERROR;
 478
 479         command_print(CMD,
 480                         "FT232R num: TMS = %d %s", tms_gpio, ft232r_bit_number_to_name(tms_gpio));
 481
 482         return ERROR_OK;
 483 }
 484
 485 COMMAND_HANDLER(ft232r_handle_tdo_num_command)
 486 {
 487         if (CMD_ARGC == 1)
 488                 tdo_gpio = ft232r_bit_name_to_number(CMD_ARGV[0]);
 489         else if (CMD_ARGC != 0)
 490                 return ERROR_COMMAND_SYNTAX_ERROR;
 491
 492         if (tdo_gpio < 0)
 493                 return ERROR_COMMAND_SYNTAX_ERROR;
 494
 495         command_print(CMD,
 496                         "FT232R num: TDO = %d %s", tdo_gpio, ft232r_bit_number_to_name(tdo_gpio));
 497
 498         return ERROR_OK;
 499 }
 500
 501 COMMAND_HANDLER(ft232r_handle_tdi_num_command)
 502 {
 503         if (CMD_ARGC == 1)
 504                 tdi_gpio = ft232r_bit_name_to_number(CMD_ARGV[0]);
 505         else if (CMD_ARGC != 0)
 506                 return ERROR_COMMAND_SYNTAX_ERROR;
 507
 508         if (tdi_gpio < 0)
 509                 return ERROR_COMMAND_SYNTAX_ERROR;
 510
 511         command_print(CMD,
 512                         "FT232R num: TDI = %d %s", tdi_gpio, ft232r_bit_number_to_name(tdi_gpio));
 513
 514         return ERROR_OK;
 515 }
 516
 517 COMMAND_HANDLER(ft232r_handle_trst_num_command)
 518 {
 519         if (CMD_ARGC == 1)
 520                 ntrst_gpio = ft232r_bit_name_to_number(CMD_ARGV[0]);
 521         else if (CMD_ARGC != 0)
 522                 return ERROR_COMMAND_SYNTAX_ERROR;
 523
 524         if (ntrst_gpio < 0)
 525                 return ERROR_COMMAND_SYNTAX_ERROR;
 526
 527         command_print(CMD,
 528                         "FT232R num: TRST = %d %s", ntrst_gpio, ft232r_bit_number_to_name(ntrst_gpio));
 529
 530         return ERROR_OK;
 531 }
 532
 533 COMMAND_HANDLER(ft232r_handle_srst_num_command)
 534 {
 535         if (CMD_ARGC == 1)
 536                 nsysrst_gpio = ft232r_bit_name_to_number(CMD_ARGV[0]);
 537         else if (CMD_ARGC != 0)
 538                 return ERROR_COMMAND_SYNTAX_ERROR;
 539
 540         if (nsysrst_gpio < 0)
 541                 return ERROR_COMMAND_SYNTAX_ERROR;
 542
 543         command_print(CMD,
 544                         "FT232R num: SRST = %d %s", nsysrst_gpio, ft232r_bit_number_to_name(nsysrst_gpio));
 545
 546         return ERROR_OK;
 547 }
 548
 549 COMMAND_HANDLER(ft232r_handle_restore_serial_command)
 550 {
 551         if (CMD_ARGC == 1)
 552                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], ft232r_restore_bitmode);
 553         else if (CMD_ARGC != 0)
 554                 return ERROR_COMMAND_SYNTAX_ERROR;
 555
 556         command_print(CMD,
 557                         "FT232R restore serial: 0x%04X (%s)",
 558                         ft232r_restore_bitmode, ft232r_restore_bitmode == 0xFFFF ? "disabled" : "enabled");
 559
 560         return ERROR_OK;
 561 }
 562
 563 static const struct command_registration ft232r_command_handlers[] = {
 564         {
 565                 .name = "ft232r_serial_desc",
 566                 .handler = ft232r_handle_serial_desc_command,
 567                 .mode = COMMAND_CONFIG,
 568                 .help = "USB serial descriptor of the adapter",
 569                 .usage = "serial string",
 570         },
 571         {
 572                 .name = "ft232r_vid_pid",
 573                 .handler = ft232r_handle_vid_pid_command,
 574                 .mode = COMMAND_CONFIG,
 575                 .help = "USB VID and PID of the adapter",
 576                 .usage = "vid pid",
 577         },
 578         {
 579                 .name = "ft232r_jtag_nums",
 580                 .handler = ft232r_handle_jtag_nums_command,
 581                 .mode = COMMAND_CONFIG,
 582                 .help = "gpio numbers for tck, tms, tdi, tdo. (in that order)",
 583                 .usage = "<0-7|TXD-RI> <0-7|TXD-RI> <0-7|TXD-RI> <0-7|TXD-RI>",
 584         },
 585         {
 586                 .name = "ft232r_tck_num",
 587                 .handler = ft232r_handle_tck_num_command,
 588                 .mode = COMMAND_CONFIG,
 589                 .help = "gpio number for tck.",
 590                 .usage = "<0-7|TXD|RXD|RTS|CTS|DTR|DSR|DCD|RI>",
 591         },
 592         {
 593                 .name = "ft232r_tms_num",
 594                 .handler = ft232r_handle_tms_num_command,
 595                 .mode = COMMAND_CONFIG,
 596                 .help = "gpio number for tms.",
 597                 .usage = "<0-7|TXD|RXD|RTS|CTS|DTR|DSR|DCD|RI>",
 598         },
 599         {
 600                 .name = "ft232r_tdo_num",
 601                 .handler = ft232r_handle_tdo_num_command,
 602                 .mode = COMMAND_CONFIG,
 603                 .help = "gpio number for tdo.",
 604                 .usage = "<0-7|TXD|RXD|RTS|CTS|DTR|DSR|DCD|RI>",
 605         },
 606         {
 607                 .name = "ft232r_tdi_num",
 608                 .handler = ft232r_handle_tdi_num_command,
 609                 .mode = COMMAND_CONFIG,
 610                 .help = "gpio number for tdi.",
 611                 .usage = "<0-7|TXD|RXD|RTS|CTS|DTR|DSR|DCD|RI>",
 612         },
 613         {
 614                 .name = "ft232r_srst_num",
 615                 .handler = ft232r_handle_srst_num_command,
 616                 .mode = COMMAND_CONFIG,
 617                 .help = "gpio number for srst.",
 618                 .usage = "<0-7|TXD|RXD|RTS|CTS|DTR|DSR|DCD|RI>",
 619         },
 620         {
 621                 .name = "ft232r_trst_num",
 622                 .handler = ft232r_handle_trst_num_command,
 623                 .mode = COMMAND_CONFIG,
 624                 .help = "gpio number for trst.",
 625                 .usage = "<0-7|TXD|RXD|RTS|CTS|DTR|DSR|DCD|RI>",
 626         },
 627         {
 628                 .name = "ft232r_restore_serial",
 629                 .handler = ft232r_handle_restore_serial_command,
 630                 .mode = COMMAND_CONFIG,
 631                 .help = "bitmode control word that restores serial port.",
 632                 .usage = "bitmode_control_word",
 633         },
 634         COMMAND_REGISTRATION_DONE
 635 };
 636
 637 /*
 638  * Synchronous bitbang protocol implementation.
 639  */
 640
 641 static void syncbb_end_state(tap_state_t state)
 642 {
 643         if (tap_is_state_stable(state))
 644                 tap_set_end_state(state);
 645         else {
 646                 LOG_ERROR("BUG: %i is not a valid end state", state);
 647                 exit(-1);
 648         }
 649 }
 650
 651 static void syncbb_state_move(int skip)
 652 {
 653         int i = 0, tms = 0;
 654         uint8_t tms_scan = tap_get_tms_path(tap_get_state(), tap_get_end_state());
 655         int tms_count = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
 656
 657         for (i = skip; i < tms_count; i++) {
 658                 tms = (tms_scan >> i) & 1;
 659                 ft232r_write(0, tms, 0);
 660                 ft232r_write(1, tms, 0);
 661         }
 662         ft232r_write(0, tms, 0);
 663
 664         tap_set_state(tap_get_end_state());
 665 }
 666
 667 /**
 668  * Clock a bunch of TMS (or SWDIO) transitions, to change the JTAG
 669  * (or SWD) state machine.
 670  */
 671 static int syncbb_execute_tms(struct jtag_command *cmd)
 672 {
 673         unsigned num_bits = cmd->cmd.tms->num_bits;
 674         const uint8_t *bits = cmd->cmd.tms->bits;
 675
 676         LOG_DEBUG_IO("TMS: %d bits", num_bits);
 677
 678         int tms = 0;
 679         for (unsigned i = 0; i < num_bits; i++) {
 680                 tms = ((bits[i/8] >> (i % 8)) & 1);
 681                 ft232r_write(0, tms, 0);
 682                 ft232r_write(1, tms, 0);
 683         }
 684         ft232r_write(0, tms, 0);
 685
 686         return ERROR_OK;
 687 }
 688
 689 static void syncbb_path_move(struct pathmove_command *cmd)
 690 {
 691         int num_states = cmd->num_states;
 692         int state_count;
 693         int tms = 0;
 694
 695         state_count = 0;
 696         while (num_states) {
 697                 if (tap_state_transition(tap_get_state(), false) == cmd->path[state_count]) {
 698                         tms = 0;
 699                 } else if (tap_state_transition(tap_get_state(), true) == cmd->path[state_count]) {
 700                         tms = 1;
 701                 } else {
 702                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 703                                 tap_state_name(tap_get_state()),
 704                                 tap_state_name(cmd->path[state_count]));
 705                         exit(-1);
 706                 }
 707
 708                 ft232r_write(0, tms, 0);
 709                 ft232r_write(1, tms, 0);
 710
 711                 tap_set_state(cmd->path[state_count]);
 712                 state_count++;
 713                 num_states--;
 714         }
 715
 716         ft232r_write(0, tms, 0);
 717
 718         tap_set_end_state(tap_get_state());
 719 }
 720
 721 static void syncbb_runtest(int num_cycles)
 722 {
 723         int i;
 724
 725         tap_state_t saved_end_state = tap_get_end_state();
 726
 727         /* only do a state_move when we're not already in IDLE */
 728         if (tap_get_state() != TAP_IDLE) {
 729                 syncbb_end_state(TAP_IDLE);
 730                 syncbb_state_move(0);
 731         }
 732
 733         /* execute num_cycles */
 734         for (i = 0; i < num_cycles; i++) {
 735                 ft232r_write(0, 0, 0);
 736                 ft232r_write(1, 0, 0);
 737         }
 738         ft232r_write(0, 0, 0);
 739
 740         /* finish in end_state */
 741         syncbb_end_state(saved_end_state);
 742         if (tap_get_state() != tap_get_end_state())
 743                 syncbb_state_move(0);
 744 }
 745
 746 /**
 747  * Function syncbb_stableclocks
 748  * issues a number of clock cycles while staying in a stable state.
 749  * Because the TMS value required to stay in the RESET state is a 1, whereas
 750  * the TMS value required to stay in any of the other stable states is a 0,
 751  * this function checks the current stable state to decide on the value of TMS
 752  * to use.
 753  */
 754 static void syncbb_stableclocks(int num_cycles)
 755 {
 756         int tms = (tap_get_state() == TAP_RESET ? 1 : 0);
 757         int i;
 758
 759         /* send num_cycles clocks onto the cable */
 760         for (i = 0; i < num_cycles; i++) {
 761                 ft232r_write(1, tms, 0);
 762                 ft232r_write(0, tms, 0);
 763         }
 764 }
 765
 766 static void syncbb_scan(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size)
 767 {
 768         tap_state_t saved_end_state = tap_get_end_state();
 769         int bit_cnt, bit0_index;
 770
 771         if (!((!ir_scan && (tap_get_state() == TAP_DRSHIFT)) || (ir_scan && (tap_get_state() == TAP_IRSHIFT)))) {
 772                 if (ir_scan)
 773                         syncbb_end_state(TAP_IRSHIFT);
 774                 else
 775                         syncbb_end_state(TAP_DRSHIFT);
 776
 777                 syncbb_state_move(0);
 778                 syncbb_end_state(saved_end_state);
 779         }
 780
 781         bit0_index = ft232r_output_len;
 782         for (bit_cnt = 0; bit_cnt < scan_size; bit_cnt++) {
 783                 int tms = (bit_cnt == scan_size-1) ? 1 : 0;
 784                 int tdi;
 785                 int bytec = bit_cnt/8;
 786                 int bcval = 1 << (bit_cnt % 8);
 787
 788                 /* if we're just reading the scan, but don't care about the output
 789                  * default to outputting 'low', this also makes valgrind traces more readable,
 790                  * as it removes the dependency on an uninitialised value
 791                  */
 792                 tdi = 0;
 793                 if ((type != SCAN_IN) && (buffer[bytec] & bcval))
 794                         tdi = 1;
 795
 796                 ft232r_write(0, tms, tdi);
 797                 ft232r_write(1, tms, tdi);
 798         }
 799
 800         if (tap_get_state() != tap_get_end_state()) {
 801                 /* we *KNOW* the above loop transitioned out of
 802                  * the shift state, so we skip the first state
 803                  * and move directly to the end state.
 804                  */
 805                 syncbb_state_move(1);
 806         }
 807         ft232r_send_recv();
 808
 809         if (type != SCAN_OUT)
 810                 for (bit_cnt = 0; bit_cnt < scan_size; bit_cnt++) {
 811                         int bytec = bit_cnt/8;
 812                         int bcval = 1 << (bit_cnt % 8);
 813                         int val = ft232r_output[bit0_index + bit_cnt*2 + 1];
 814
 815                         if (val & (1<<tdo_gpio))
 816                                 buffer[bytec] |= bcval;
 817                         else
 818                                 buffer[bytec] &= ~bcval;
 819                 }
 820 }
 821
 822 static int syncbb_execute_queue(void)
 823 {
 824         struct jtag_command *cmd = jtag_command_queue; /* currently processed command */
 825         int scan_size;
 826         enum scan_type type;
 827         uint8_t *buffer;
 828         int retval;
 829
 830         /* return ERROR_OK, unless a jtag_read_buffer returns a failed check
 831          * that wasn't handled by a caller-provided error handler
 832          */
 833         retval = ERROR_OK;
 834
 835 /*      ft232r_blink(1);*/
 836
 837         while (cmd) {
 838                 switch (cmd->type) {
 839                         case JTAG_RESET:
 840                                 LOG_DEBUG_IO("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 841
 842                                 if ((cmd->cmd.reset->trst == 1) ||
 843                                         (cmd->cmd.reset->srst &&
 844                                         (jtag_get_reset_config() & RESET_SRST_PULLS_TRST))) {
 845                                         tap_set_state(TAP_RESET);
 846                                 }
 847                                 ft232r_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 848                                 break;
 849
 850                         case JTAG_RUNTEST:
 851                                 LOG_DEBUG_IO("runtest %i cycles, end in %s", cmd->cmd.runtest->num_cycles,
 852                                         tap_state_name(cmd->cmd.runtest->end_state));
 853
 854                                 syncbb_end_state(cmd->cmd.runtest->end_state);
 855                                 syncbb_runtest(cmd->cmd.runtest->num_cycles);
 856                                 break;
 857
 858                         case JTAG_STABLECLOCKS:
 859                                 /* this is only allowed while in a stable state.  A check for a stable
 860                                  * state was done in jtag_add_clocks()
 861                                  */
 862                                 syncbb_stableclocks(cmd->cmd.stableclocks->num_cycles);
 863                                 break;
 864
 865                         case JTAG_TLR_RESET: /* renamed from JTAG_STATEMOVE */
 866                                 LOG_DEBUG_IO("statemove end in %s", tap_state_name(cmd->cmd.statemove->end_state));
 867
 868                                 syncbb_end_state(cmd->cmd.statemove->end_state);
 869                                 syncbb_state_move(0);
 870                                 break;
 871
 872                         case JTAG_PATHMOVE:
 873                                 LOG_DEBUG_IO("pathmove: %i states, end in %s", cmd->cmd.pathmove->num_states,
 874                                         tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
 875
 876                                 syncbb_path_move(cmd->cmd.pathmove);
 877                                 break;
 878
 879                         case JTAG_SCAN:
 880                                 LOG_DEBUG_IO("%s scan end in %s",  (cmd->cmd.scan->ir_scan) ? "IR" : "DR",
 881                                         tap_state_name(cmd->cmd.scan->end_state));
 882
 883                                 syncbb_end_state(cmd->cmd.scan->end_state);
 884                                 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
 885                                 type = jtag_scan_type(cmd->cmd.scan);
 886                                 syncbb_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size);
 887                                 if (jtag_read_buffer(buffer, cmd->cmd.scan) != ERROR_OK)
 888                                         retval = ERROR_JTAG_QUEUE_FAILED;
 889                                 if (buffer)
 890                                         free(buffer);
 891                                 break;
 892
 893                         case JTAG_SLEEP:
 894                                 LOG_DEBUG_IO("sleep %" PRIi32, cmd->cmd.sleep->us);
 895
 896                                 jtag_sleep(cmd->cmd.sleep->us);
 897                                 break;
 898
 899                         case JTAG_TMS:
 900                                 retval = syncbb_execute_tms(cmd);
 901                                 break;
 902                         default:
 903                                 LOG_ERROR("BUG: unknown JTAG command type encountered");
 904                                 exit(-1);
 905                 }
 906                 if (ft232r_output_len > 0)
 907                         ft232r_send_recv();
 908                 cmd = cmd->next;
 909         }
 910 /*      ft232r_blink(0);*/
 911
 912         return retval;
 913 }
 914
 915 static struct jtag_interface ft232r_interface = {
 916         .supported = DEBUG_CAP_TMS_SEQ,
 917         .execute_queue = syncbb_execute_queue,
 918 };
 919
 920 struct adapter_driver ft232r_adapter_driver = {
 921         .name = "ft232r",
 922         .transports = jtag_only,
 923         .commands = ft232r_command_handlers,
 924
 925         .init = ft232r_init,
 926         .quit = ft232r_quit,
 927         .speed = ft232r_speed,
 928         .khz = ft232r_khz,
 929         .speed_div = ft232r_speed_div,
 930
 931         .jtag_ops = &ft232r_interface,
 932 };