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

   1 /**************************************************************************
   2 *   Copyright (C) 2012 by Andreas Fritiofson                              *
   3 *   andreas.fritiofson@gmail.com                                          *
   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 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  19 ***************************************************************************/
  20
  21 /**
  22  * @file
  23  * JTAG adapters based on the FT2232 full and high speed USB parts are
  24  * popular low cost JTAG debug solutions.  Many FT2232 based JTAG adapters
  25  * are discrete, but development boards may integrate them as alternatives
  26  * to more capable (and expensive) third party JTAG pods.
  27  *
  28  * JTAG uses only one of the two communications channels ("MPSSE engines")
  29  * on these devices.  Adapters based on FT4232 parts have four ports/channels
  30  * (A/B/C/D), instead of just two (A/B).
  31  *
  32  * Especially on development boards integrating one of these chips (as
  33  * opposed to discrete pods/dongles), the additional channels can be used
  34  * for a variety of purposes, but OpenOCD only uses one channel at a time.
  35  *
  36  *  - As a USB-to-serial adapter for the target's console UART ...
  37  *    which may be able to support ROM boot loaders that load initial
  38  *    firmware images to flash (or SRAM).
  39  *
  40  *  - On systems which support ARM's SWD in addition to JTAG, or instead
  41  *    of it, that second port can be used for reading SWV/SWO trace data.
  42  *
  43  *  - Additional JTAG links, e.g. to a CPLD or * FPGA.
  44  *
  45  * FT2232 based JTAG adapters are "dumb" not "smart", because most JTAG
  46  * request/response interactions involve round trips over the USB link.
  47  * A "smart" JTAG adapter has intelligence close to the scan chain, so it
  48  * can for example poll quickly for a status change (usually taking on the
  49  * order of microseconds not milliseconds) before beginning a queued
  50  * transaction which require the previous one to have completed.
  51  *
  52  * There are dozens of adapters of this type, differing in details which
  53  * this driver needs to understand.  Those "layout" details are required
  54  * as part of FT2232 driver configuration.
  55  *
  56  * This code uses information contained in the MPSSE specification which was
  57  * found here:
  58  * http://www.ftdichip.com/Documents/AppNotes/AN2232C-01_MPSSE_Cmnd.pdf
  59  * Hereafter this is called the "MPSSE Spec".
  60  *
  61  * The datasheet for the ftdichip.com's FT2232D part is here:
  62  * http://www.ftdichip.com/Documents/DataSheets/DS_FT2232D.pdf
  63  *
  64  * Also note the issue with code 0x4b (clock data to TMS) noted in
  65  * http://developer.intra2net.com/mailarchive/html/libftdi/2009/msg00292.html
  66  * which can affect longer JTAG state paths.
  67  */
  68
  69 #ifdef HAVE_CONFIG_H
  70 #include "config.h"
  71 #endif
  72
  73 /* project specific includes */
  74 #include <jtag/interface.h>
  75 #include <jtag/swd.h>
  76 #include <transport/transport.h>
  77 #include <helper/time_support.h>
  78
  79 #if IS_CYGWIN == 1
  80 #include <windows.h>
  81 #endif
  82
  83 #include <assert.h>
  84
  85 /* FTDI access library includes */
  86 #include "mpsse.h"
  87
  88 #define JTAG_MODE (LSB_FIRST | POS_EDGE_IN | NEG_EDGE_OUT)
  89 #define SWD_MODE (LSB_FIRST | POS_EDGE_IN | NEG_EDGE_OUT)
  90
  91 static char *ftdi_device_desc;
  92 static char *ftdi_serial;
  93 static uint8_t ftdi_channel;
  94
  95 static bool swd_mode;
  96
  97 #define MAX_USB_IDS 8
  98 /* vid = pid = 0 marks the end of the list */
  99 static uint16_t ftdi_vid[MAX_USB_IDS + 1] = { 0 };
 100 static uint16_t ftdi_pid[MAX_USB_IDS + 1] = { 0 };
 101
 102 static struct mpsse_ctx *mpsse_ctx;
 103
 104 struct signal {
 105         const char *name;
 106         uint16_t data_mask;
 107         uint16_t oe_mask;
 108         bool invert_data;
 109         bool invert_oe;
 110         struct signal *next;
 111 };
 112
 113 static struct signal *signals;
 114
 115 /* FIXME: Where to store per-instance data? We need an SWD context. */
 116 static struct swd_cmd_queue_entry {
 117         uint8_t cmd;
 118         uint32_t *dst;
 119         uint8_t trn_ack_data_parity_trn[DIV_ROUND_UP(4 + 3 + 32 + 1 + 4, 8)];
 120 } *swd_cmd_queue;
 121 static size_t swd_cmd_queue_length;
 122 static size_t swd_cmd_queue_alloced;
 123 static int queued_retval;
 124 static int freq;
 125
 126 static uint16_t output;
 127 static uint16_t direction;
 128 static uint16_t jtag_output_init;
 129 static uint16_t jtag_direction_init;
 130
 131 static int ftdi_swd_switch_seq(struct adiv5_dap *dap, enum swd_special_seq seq);
 132
 133 static struct signal *find_signal_by_name(const char *name)
 134 {
 135         for (struct signal *sig = signals; sig; sig = sig->next) {
 136                 if (strcmp(name, sig->name) == 0)
 137                         return sig;
 138         }
 139         return NULL;
 140 }
 141
 142 static struct signal *create_signal(const char *name)
 143 {
 144         struct signal **psig = &signals;
 145         while (*psig)
 146                 psig = &(*psig)->next;
 147
 148         *psig = calloc(1, sizeof(**psig));
 149         if (*psig == NULL)
 150                 return NULL;
 151
 152         (*psig)->name = strdup(name);
 153         if ((*psig)->name == NULL) {
 154                 free(*psig);
 155                 *psig = NULL;
 156         }
 157         return *psig;
 158 }
 159
 160 static int ftdi_set_signal(const struct signal *s, char value)
 161 {
 162         bool data;
 163         bool oe;
 164
 165         if (s->data_mask == 0 && s->oe_mask == 0) {
 166                 LOG_ERROR("interface doesn't provide signal '%s'", s->name);
 167                 return ERROR_FAIL;
 168         }
 169         switch (value) {
 170         case '0':
 171                 data = s->invert_data;
 172                 oe = !s->invert_oe;
 173                 break;
 174         case '1':
 175                 if (s->data_mask == 0) {
 176                         LOG_ERROR("interface can't drive '%s' high", s->name);
 177                         return ERROR_FAIL;
 178                 }
 179                 data = !s->invert_data;
 180                 oe = !s->invert_oe;
 181                 break;
 182         case 'z':
 183         case 'Z':
 184                 if (s->oe_mask == 0) {
 185                         LOG_ERROR("interface can't tri-state '%s'", s->name);
 186                         return ERROR_FAIL;
 187                 }
 188                 data = s->invert_data;
 189                 oe = s->invert_oe;
 190                 break;
 191         default:
 192                 assert(0 && "invalid signal level specifier");
 193                 return ERROR_FAIL;
 194         }
 195
 196         uint16_t old_output = output;
 197         uint16_t old_direction = direction;
 198
 199         output = data ? output | s->data_mask : output & ~s->data_mask;
 200         if (s->oe_mask == s->data_mask)
 201                 direction = oe ? direction | s->oe_mask : direction & ~s->oe_mask;
 202         else
 203                 output = oe ? output | s->oe_mask : output & ~s->oe_mask;
 204
 205         if ((output & 0xff) != (old_output & 0xff) || (direction & 0xff) != (old_direction & 0xff))
 206                 mpsse_set_data_bits_low_byte(mpsse_ctx, output & 0xff, direction & 0xff);
 207         if ((output >> 8 != old_output >> 8) || (direction >> 8 != old_direction >> 8))
 208                 mpsse_set_data_bits_high_byte(mpsse_ctx, output >> 8, direction >> 8);
 209
 210         return ERROR_OK;
 211 }
 212
 213
 214 /**
 215  * Function move_to_state
 216  * moves the TAP controller from the current state to a
 217  * \a goal_state through a path given by tap_get_tms_path().  State transition
 218  * logging is performed by delegation to clock_tms().
 219  *
 220  * @param goal_state is the destination state for the move.
 221  */
 222 static void move_to_state(tap_state_t goal_state)
 223 {
 224         tap_state_t start_state = tap_get_state();
 225
 226         /*      goal_state is 1/2 of a tuple/pair of states which allow convenient
 227                 lookup of the required TMS pattern to move to this state from the
 228                 start state.
 229         */
 230
 231         /* do the 2 lookups */
 232         uint8_t tms_bits  = tap_get_tms_path(start_state, goal_state);
 233         int tms_count = tap_get_tms_path_len(start_state, goal_state);
 234         assert(tms_count <= 8);
 235
 236         DEBUG_JTAG_IO("start=%s goal=%s", tap_state_name(start_state), tap_state_name(goal_state));
 237
 238         /* Track state transitions step by step */
 239         for (int i = 0; i < tms_count; i++)
 240                 tap_set_state(tap_state_transition(tap_get_state(), (tms_bits >> i) & 1));
 241
 242         mpsse_clock_tms_cs_out(mpsse_ctx,
 243                 &tms_bits,
 244                 0,
 245                 tms_count,
 246                 false,
 247                 JTAG_MODE);
 248 }
 249
 250 static int ftdi_speed(int speed)
 251 {
 252         int retval;
 253         retval = mpsse_set_frequency(mpsse_ctx, speed);
 254
 255         if (retval < 0) {
 256                 LOG_ERROR("couldn't set FTDI TCK speed");
 257                 return retval;
 258         }
 259
 260         return ERROR_OK;
 261 }
 262
 263 static int ftdi_speed_div(int speed, int *khz)
 264 {
 265         *khz = speed / 1000;
 266         return ERROR_OK;
 267 }
 268
 269 static int ftdi_khz(int khz, int *jtag_speed)
 270 {
 271         if (khz == 0 && !mpsse_is_high_speed(mpsse_ctx)) {
 272                 LOG_DEBUG("RCLK not supported");
 273                 return ERROR_FAIL;
 274         }
 275
 276         *jtag_speed = khz * 1000;
 277         return ERROR_OK;
 278 }
 279
 280 static void ftdi_end_state(tap_state_t state)
 281 {
 282         if (tap_is_state_stable(state))
 283                 tap_set_end_state(state);
 284         else {
 285                 LOG_ERROR("BUG: %s is not a stable end state", tap_state_name(state));
 286                 exit(-1);
 287         }
 288 }
 289
 290 static void ftdi_execute_runtest(struct jtag_command *cmd)
 291 {
 292         int i;
 293         uint8_t zero = 0;
 294
 295         DEBUG_JTAG_IO("runtest %i cycles, end in %s",
 296                 cmd->cmd.runtest->num_cycles,
 297                 tap_state_name(cmd->cmd.runtest->end_state));
 298
 299         if (tap_get_state() != TAP_IDLE)
 300                 move_to_state(TAP_IDLE);
 301
 302         /* TODO: Reuse ftdi_execute_stableclocks */
 303         i = cmd->cmd.runtest->num_cycles;
 304         while (i > 0) {
 305                 /* there are no state transitions in this code, so omit state tracking */
 306                 unsigned this_len = i > 7 ? 7 : i;
 307                 mpsse_clock_tms_cs_out(mpsse_ctx, &zero, 0, this_len, false, JTAG_MODE);
 308                 i -= this_len;
 309         }
 310
 311         ftdi_end_state(cmd->cmd.runtest->end_state);
 312
 313         if (tap_get_state() != tap_get_end_state())
 314                 move_to_state(tap_get_end_state());
 315
 316         DEBUG_JTAG_IO("runtest: %i, end in %s",
 317                 cmd->cmd.runtest->num_cycles,
 318                 tap_state_name(tap_get_end_state()));
 319 }
 320
 321 static void ftdi_execute_statemove(struct jtag_command *cmd)
 322 {
 323         DEBUG_JTAG_IO("statemove end in %s",
 324                 tap_state_name(cmd->cmd.statemove->end_state));
 325
 326         ftdi_end_state(cmd->cmd.statemove->end_state);
 327
 328         /* shortest-path move to desired end state */
 329         if (tap_get_state() != tap_get_end_state() || tap_get_end_state() == TAP_RESET)
 330                 move_to_state(tap_get_end_state());
 331 }
 332
 333 /**
 334  * Clock a bunch of TMS (or SWDIO) transitions, to change the JTAG
 335  * (or SWD) state machine. REVISIT: Not the best method, perhaps.
 336  */
 337 static void ftdi_execute_tms(struct jtag_command *cmd)
 338 {
 339         DEBUG_JTAG_IO("TMS: %d bits", cmd->cmd.tms->num_bits);
 340
 341         /* TODO: Missing tap state tracking, also missing from ft2232.c! */
 342         mpsse_clock_tms_cs_out(mpsse_ctx,
 343                 cmd->cmd.tms->bits,
 344                 0,
 345                 cmd->cmd.tms->num_bits,
 346                 false,
 347                 JTAG_MODE);
 348 }
 349
 350 static void ftdi_execute_pathmove(struct jtag_command *cmd)
 351 {
 352         tap_state_t *path = cmd->cmd.pathmove->path;
 353         int num_states  = cmd->cmd.pathmove->num_states;
 354
 355         DEBUG_JTAG_IO("pathmove: %i states, current: %s  end: %s", num_states,
 356                 tap_state_name(tap_get_state()),
 357                 tap_state_name(path[num_states-1]));
 358
 359         int state_count = 0;
 360         unsigned bit_count = 0;
 361         uint8_t tms_byte = 0;
 362
 363         DEBUG_JTAG_IO("-");
 364
 365         /* this loop verifies that the path is legal and logs each state in the path */
 366         while (num_states--) {
 367
 368                 /* either TMS=0 or TMS=1 must work ... */
 369                 if (tap_state_transition(tap_get_state(), false)
 370                     == path[state_count])
 371                         buf_set_u32(&tms_byte, bit_count++, 1, 0x0);
 372                 else if (tap_state_transition(tap_get_state(), true)
 373                          == path[state_count]) {
 374                         buf_set_u32(&tms_byte, bit_count++, 1, 0x1);
 375
 376                         /* ... or else the caller goofed BADLY */
 377                 } else {
 378                         LOG_ERROR("BUG: %s -> %s isn't a valid "
 379                                 "TAP state transition",
 380                                 tap_state_name(tap_get_state()),
 381                                 tap_state_name(path[state_count]));
 382                         exit(-1);
 383                 }
 384
 385                 tap_set_state(path[state_count]);
 386                 state_count++;
 387
 388                 if (bit_count == 7 || num_states == 0) {
 389                         mpsse_clock_tms_cs_out(mpsse_ctx,
 390                                         &tms_byte,
 391                                         0,
 392                                         bit_count,
 393                                         false,
 394                                         JTAG_MODE);
 395                         bit_count = 0;
 396                 }
 397         }
 398         tap_set_end_state(tap_get_state());
 399 }
 400
 401 static void ftdi_execute_scan(struct jtag_command *cmd)
 402 {
 403         DEBUG_JTAG_IO("%s type:%d", cmd->cmd.scan->ir_scan ? "IRSCAN" : "DRSCAN",
 404                 jtag_scan_type(cmd->cmd.scan));
 405
 406         /* Make sure there are no trailing fields with num_bits == 0, or the logic below will fail. */
 407         while (cmd->cmd.scan->num_fields > 0
 408                         && cmd->cmd.scan->fields[cmd->cmd.scan->num_fields - 1].num_bits == 0) {
 409                 cmd->cmd.scan->num_fields--;
 410                 LOG_DEBUG("discarding trailing empty field");
 411         }
 412
 413         if (cmd->cmd.scan->num_fields == 0) {
 414                 LOG_DEBUG("empty scan, doing nothing");
 415                 return;
 416         }
 417
 418         if (cmd->cmd.scan->ir_scan) {
 419                 if (tap_get_state() != TAP_IRSHIFT)
 420                         move_to_state(TAP_IRSHIFT);
 421         } else {
 422                 if (tap_get_state() != TAP_DRSHIFT)
 423                         move_to_state(TAP_DRSHIFT);
 424         }
 425
 426         ftdi_end_state(cmd->cmd.scan->end_state);
 427
 428         struct scan_field *field = cmd->cmd.scan->fields;
 429         unsigned scan_size = 0;
 430
 431         for (int i = 0; i < cmd->cmd.scan->num_fields; i++, field++) {
 432                 scan_size += field->num_bits;
 433                 DEBUG_JTAG_IO("%s%s field %d/%d %d bits",
 434                         field->in_value ? "in" : "",
 435                         field->out_value ? "out" : "",
 436                         i,
 437                         cmd->cmd.scan->num_fields,
 438                         field->num_bits);
 439
 440                 if (i == cmd->cmd.scan->num_fields - 1 && tap_get_state() != tap_get_end_state()) {
 441                         /* Last field, and we're leaving IRSHIFT/DRSHIFT. Clock last bit during tap
 442                          * movement. This last field can't have length zero, it was checked above. */
 443                         mpsse_clock_data(mpsse_ctx,
 444                                 field->out_value,
 445                                 0,
 446                                 field->in_value,
 447                                 0,
 448                                 field->num_bits - 1,
 449                                 JTAG_MODE);
 450                         uint8_t last_bit = 0;
 451                         if (field->out_value)
 452                                 bit_copy(&last_bit, 0, field->out_value, field->num_bits - 1, 1);
 453                         uint8_t tms_bits = 0x01;
 454                         mpsse_clock_tms_cs(mpsse_ctx,
 455                                         &tms_bits,
 456                                         0,
 457                                         field->in_value,
 458                                         field->num_bits - 1,
 459                                         1,
 460                                         last_bit,
 461                                         JTAG_MODE);
 462                         tap_set_state(tap_state_transition(tap_get_state(), 1));
 463                         mpsse_clock_tms_cs_out(mpsse_ctx,
 464                                         &tms_bits,
 465                                         1,
 466                                         1,
 467                                         last_bit,
 468                                         JTAG_MODE);
 469                         tap_set_state(tap_state_transition(tap_get_state(), 0));
 470                 } else
 471                         mpsse_clock_data(mpsse_ctx,
 472                                 field->out_value,
 473                                 0,
 474                                 field->in_value,
 475                                 0,
 476                                 field->num_bits,
 477                                 JTAG_MODE);
 478         }
 479
 480         if (tap_get_state() != tap_get_end_state())
 481                 move_to_state(tap_get_end_state());
 482
 483         DEBUG_JTAG_IO("%s scan, %i bits, end in %s",
 484                 (cmd->cmd.scan->ir_scan) ? "IR" : "DR", scan_size,
 485                 tap_state_name(tap_get_end_state()));
 486 }
 487
 488 static void ftdi_execute_reset(struct jtag_command *cmd)
 489 {
 490         DEBUG_JTAG_IO("reset trst: %i srst %i",
 491                 cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 492
 493         if (cmd->cmd.reset->trst == 1
 494             || (cmd->cmd.reset->srst
 495                 && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
 496                 tap_set_state(TAP_RESET);
 497
 498         struct signal *trst = find_signal_by_name("nTRST");
 499         if (cmd->cmd.reset->trst == 1) {
 500                 if (trst)
 501                         ftdi_set_signal(trst, '0');
 502                 else
 503                         LOG_ERROR("Can't assert TRST: nTRST signal is not defined");
 504         } else if (trst && jtag_get_reset_config() & RESET_HAS_TRST &&
 505                         cmd->cmd.reset->trst == 0) {
 506                 if (jtag_get_reset_config() & RESET_TRST_OPEN_DRAIN)
 507                         ftdi_set_signal(trst, 'z');
 508                 else
 509                         ftdi_set_signal(trst, '1');
 510         }
 511
 512         struct signal *srst = find_signal_by_name("nSRST");
 513         if (cmd->cmd.reset->srst == 1) {
 514                 if (srst)
 515                         ftdi_set_signal(srst, '0');
 516                 else
 517                         LOG_ERROR("Can't assert SRST: nSRST signal is not defined");
 518         } else if (srst && jtag_get_reset_config() & RESET_HAS_SRST &&
 519                         cmd->cmd.reset->srst == 0) {
 520                 if (jtag_get_reset_config() & RESET_SRST_PUSH_PULL)
 521                         ftdi_set_signal(srst, '1');
 522                 else
 523                         ftdi_set_signal(srst, 'z');
 524         }
 525
 526         DEBUG_JTAG_IO("trst: %i, srst: %i",
 527                 cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 528 }
 529
 530 static void ftdi_execute_sleep(struct jtag_command *cmd)
 531 {
 532         DEBUG_JTAG_IO("sleep %" PRIi32, cmd->cmd.sleep->us);
 533
 534         mpsse_flush(mpsse_ctx);
 535         jtag_sleep(cmd->cmd.sleep->us);
 536         DEBUG_JTAG_IO("sleep %" PRIi32 " usec while in %s",
 537                 cmd->cmd.sleep->us,
 538                 tap_state_name(tap_get_state()));
 539 }
 540
 541 static void ftdi_execute_stableclocks(struct jtag_command *cmd)
 542 {
 543         /* this is only allowed while in a stable state.  A check for a stable
 544          * state was done in jtag_add_clocks()
 545          */
 546         int num_cycles = cmd->cmd.stableclocks->num_cycles;
 547
 548         /* 7 bits of either ones or zeros. */
 549         uint8_t tms = tap_get_state() == TAP_RESET ? 0x7f : 0x00;
 550
 551         /* TODO: Use mpsse_clock_data with in=out=0 for this, if TMS can be set to
 552          * the correct level and remain there during the scan */
 553         while (num_cycles > 0) {
 554                 /* there are no state transitions in this code, so omit state tracking */
 555                 unsigned this_len = num_cycles > 7 ? 7 : num_cycles;
 556                 mpsse_clock_tms_cs_out(mpsse_ctx, &tms, 0, this_len, false, JTAG_MODE);
 557                 num_cycles -= this_len;
 558         }
 559
 560         DEBUG_JTAG_IO("clocks %i while in %s",
 561                 cmd->cmd.stableclocks->num_cycles,
 562                 tap_state_name(tap_get_state()));
 563 }
 564
 565 static void ftdi_execute_command(struct jtag_command *cmd)
 566 {
 567         switch (cmd->type) {
 568                 case JTAG_RESET:
 569                         ftdi_execute_reset(cmd);
 570                         break;
 571                 case JTAG_RUNTEST:
 572                         ftdi_execute_runtest(cmd);
 573                         break;
 574                 case JTAG_TLR_RESET:
 575                         ftdi_execute_statemove(cmd);
 576                         break;
 577                 case JTAG_PATHMOVE:
 578                         ftdi_execute_pathmove(cmd);
 579                         break;
 580                 case JTAG_SCAN:
 581                         ftdi_execute_scan(cmd);
 582                         break;
 583                 case JTAG_SLEEP:
 584                         ftdi_execute_sleep(cmd);
 585                         break;
 586                 case JTAG_STABLECLOCKS:
 587                         ftdi_execute_stableclocks(cmd);
 588                         break;
 589                 case JTAG_TMS:
 590                         ftdi_execute_tms(cmd);
 591                         break;
 592                 default:
 593                         LOG_ERROR("BUG: unknown JTAG command type encountered: %d", cmd->type);
 594                         break;
 595         }
 596 }
 597
 598 static int ftdi_execute_queue(void)
 599 {
 600         /* blink, if the current layout has that feature */
 601         struct signal *led = find_signal_by_name("LED");
 602         if (led)
 603                 ftdi_set_signal(led, '1');
 604
 605         for (struct jtag_command *cmd = jtag_command_queue; cmd; cmd = cmd->next) {
 606                 /* fill the write buffer with the desired command */
 607                 ftdi_execute_command(cmd);
 608         }
 609
 610         if (led)
 611                 ftdi_set_signal(led, '0');
 612
 613         int retval = mpsse_flush(mpsse_ctx);
 614         if (retval != ERROR_OK)
 615                 LOG_ERROR("error while flushing MPSSE queue: %d", retval);
 616
 617         return retval;
 618 }
 619
 620 static int ftdi_initialize(void)
 621 {
 622         if (tap_get_tms_path_len(TAP_IRPAUSE, TAP_IRPAUSE) == 7)
 623                 LOG_DEBUG("ftdi interface using 7 step jtag state transitions");
 624         else
 625                 LOG_DEBUG("ftdi interface using shortest path jtag state transitions");
 626
 627         for (int i = 0; ftdi_vid[i] || ftdi_pid[i]; i++) {
 628                 mpsse_ctx = mpsse_open(&ftdi_vid[i], &ftdi_pid[i], ftdi_device_desc,
 629                                 ftdi_serial, ftdi_channel);
 630                 if (mpsse_ctx)
 631                         break;
 632         }
 633
 634         if (!mpsse_ctx)
 635                 return ERROR_JTAG_INIT_FAILED;
 636
 637         output = jtag_output_init;
 638         direction = jtag_direction_init;
 639
 640         if (swd_mode) {
 641                 struct signal *sig = find_signal_by_name("SWD_EN");
 642                 if (!sig) {
 643                         LOG_ERROR("SWD mode is active but SWD_EN signal is not defined");
 644                         return ERROR_JTAG_INIT_FAILED;
 645                 }
 646                 /* A dummy SWD_EN would have zero mask */
 647                 if (sig->data_mask)
 648                         ftdi_set_signal(sig, '1');
 649         }
 650
 651         mpsse_set_data_bits_low_byte(mpsse_ctx, output & 0xff, direction & 0xff);
 652         mpsse_set_data_bits_high_byte(mpsse_ctx, output >> 8, direction >> 8);
 653
 654         mpsse_loopback_config(mpsse_ctx, false);
 655
 656         freq = mpsse_set_frequency(mpsse_ctx, jtag_get_speed_khz() * 1000);
 657
 658         return mpsse_flush(mpsse_ctx);
 659 }
 660
 661 static int ftdi_quit(void)
 662 {
 663         mpsse_close(mpsse_ctx);
 664
 665         return ERROR_OK;
 666 }
 667
 668 COMMAND_HANDLER(ftdi_handle_device_desc_command)
 669 {
 670         if (CMD_ARGC == 1) {
 671                 if (ftdi_device_desc)
 672                         free(ftdi_device_desc);
 673                 ftdi_device_desc = strdup(CMD_ARGV[0]);
 674         } else {
 675                 LOG_ERROR("expected exactly one argument to ftdi_device_desc <description>");
 676         }
 677
 678         return ERROR_OK;
 679 }
 680
 681 COMMAND_HANDLER(ftdi_handle_serial_command)
 682 {
 683         if (CMD_ARGC == 1) {
 684                 if (ftdi_serial)
 685                         free(ftdi_serial);
 686                 ftdi_serial = strdup(CMD_ARGV[0]);
 687         } else {
 688                 return ERROR_COMMAND_SYNTAX_ERROR;
 689         }
 690
 691         return ERROR_OK;
 692 }
 693
 694 COMMAND_HANDLER(ftdi_handle_channel_command)
 695 {
 696         if (CMD_ARGC == 1)
 697                 COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0], ftdi_channel);
 698         else
 699                 return ERROR_COMMAND_SYNTAX_ERROR;
 700
 701         return ERROR_OK;
 702 }
 703
 704 COMMAND_HANDLER(ftdi_handle_layout_init_command)
 705 {
 706         if (CMD_ARGC != 2)
 707                 return ERROR_COMMAND_SYNTAX_ERROR;
 708
 709         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], jtag_output_init);
 710         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[1], jtag_direction_init);
 711
 712         return ERROR_OK;
 713 }
 714
 715 COMMAND_HANDLER(ftdi_handle_layout_signal_command)
 716 {
 717         if (CMD_ARGC < 1)
 718                 return ERROR_COMMAND_SYNTAX_ERROR;
 719
 720         bool invert_data = false;
 721         uint16_t data_mask = 0;
 722         bool invert_oe = false;
 723         uint16_t oe_mask = 0;
 724         for (unsigned i = 1; i < CMD_ARGC; i += 2) {
 725                 if (strcmp("-data", CMD_ARGV[i]) == 0) {
 726                         invert_data = false;
 727                         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[i + 1], data_mask);
 728                 } else if (strcmp("-ndata", CMD_ARGV[i]) == 0) {
 729                         invert_data = true;
 730                         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[i + 1], data_mask);
 731                 } else if (strcmp("-oe", CMD_ARGV[i]) == 0) {
 732                         invert_oe = false;
 733                         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[i + 1], oe_mask);
 734                 } else if (strcmp("-noe", CMD_ARGV[i]) == 0) {
 735                         invert_oe = true;
 736                         COMMAND_PARSE_NUMBER(u16, CMD_ARGV[i + 1], oe_mask);
 737                 } else if (!strcmp("-alias", CMD_ARGV[i]) ||
 738                            !strcmp("-nalias", CMD_ARGV[i])) {
 739                         if (!strcmp("-nalias", CMD_ARGV[i]))
 740                                 invert_data = true;
 741                         struct signal *sig = find_signal_by_name(CMD_ARGV[i + 1]);
 742                         if (!sig) {
 743                                 LOG_ERROR("signal %s is not defined", CMD_ARGV[i + 1]);
 744                                 return ERROR_FAIL;
 745                         }
 746                         data_mask = sig->data_mask;
 747                         oe_mask = sig->oe_mask;
 748                         invert_oe = sig->invert_oe;
 749                         invert_data ^= sig->invert_data;
 750                 } else {
 751                         LOG_ERROR("unknown option '%s'", CMD_ARGV[i]);
 752                         return ERROR_COMMAND_SYNTAX_ERROR;
 753                 }
 754         }
 755
 756         struct signal *sig;
 757         sig = find_signal_by_name(CMD_ARGV[0]);
 758         if (!sig)
 759                 sig = create_signal(CMD_ARGV[0]);
 760         if (!sig) {
 761                 LOG_ERROR("failed to create signal %s", CMD_ARGV[0]);
 762                 return ERROR_FAIL;
 763         }
 764
 765         sig->invert_data = invert_data;
 766         sig->data_mask = data_mask;
 767         sig->invert_oe = invert_oe;
 768         sig->oe_mask = oe_mask;
 769
 770         return ERROR_OK;
 771 }
 772
 773 COMMAND_HANDLER(ftdi_handle_set_signal_command)
 774 {
 775         if (CMD_ARGC < 2)
 776                 return ERROR_COMMAND_SYNTAX_ERROR;
 777
 778         struct signal *sig;
 779         sig = find_signal_by_name(CMD_ARGV[0]);
 780         if (!sig) {
 781                 LOG_ERROR("interface configuration doesn't define signal '%s'", CMD_ARGV[0]);
 782                 return ERROR_FAIL;
 783         }
 784
 785         switch (*CMD_ARGV[1]) {
 786         case '0':
 787         case '1':
 788         case 'z':
 789         case 'Z':
 790                 /* single character level specifier only */
 791                 if (CMD_ARGV[1][1] == '\0') {
 792                         ftdi_set_signal(sig, *CMD_ARGV[1]);
 793                         break;
 794                 }
 795         default:
 796                 LOG_ERROR("unknown signal level '%s', use 0, 1 or z", CMD_ARGV[1]);
 797                 return ERROR_COMMAND_SYNTAX_ERROR;
 798         }
 799
 800         return mpsse_flush(mpsse_ctx);
 801 }
 802
 803 COMMAND_HANDLER(ftdi_handle_vid_pid_command)
 804 {
 805         if (CMD_ARGC > MAX_USB_IDS * 2) {
 806                 LOG_WARNING("ignoring extra IDs in ftdi_vid_pid "
 807                         "(maximum is %d pairs)", MAX_USB_IDS);
 808                 CMD_ARGC = MAX_USB_IDS * 2;
 809         }
 810         if (CMD_ARGC < 2 || (CMD_ARGC & 1)) {
 811                 LOG_WARNING("incomplete ftdi_vid_pid configuration directive");
 812                 if (CMD_ARGC < 2)
 813                         return ERROR_COMMAND_SYNTAX_ERROR;
 814                 /* remove the incomplete trailing id */
 815                 CMD_ARGC -= 1;
 816         }
 817
 818         unsigned i;
 819         for (i = 0; i < CMD_ARGC; i += 2) {
 820                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[i], ftdi_vid[i >> 1]);
 821                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[i + 1], ftdi_pid[i >> 1]);
 822         }
 823
 824         /*
 825          * Explicitly terminate, in case there are multiples instances of
 826          * ftdi_vid_pid.
 827          */
 828         ftdi_vid[i >> 1] = ftdi_pid[i >> 1] = 0;
 829
 830         return ERROR_OK;
 831 }
 832
 833 static const struct command_registration ftdi_command_handlers[] = {
 834         {
 835                 .name = "ftdi_device_desc",
 836                 .handler = &ftdi_handle_device_desc_command,
 837                 .mode = COMMAND_CONFIG,
 838                 .help = "set the USB device description of the FTDI device",
 839                 .usage = "description_string",
 840         },
 841         {
 842                 .name = "ftdi_serial",
 843                 .handler = &ftdi_handle_serial_command,
 844                 .mode = COMMAND_CONFIG,
 845                 .help = "set the serial number of the FTDI device",
 846                 .usage = "serial_string",
 847         },
 848         {
 849                 .name = "ftdi_channel",
 850                 .handler = &ftdi_handle_channel_command,
 851                 .mode = COMMAND_CONFIG,
 852                 .help = "set the channel of the FTDI device that is used as JTAG",
 853                 .usage = "(0-3)",
 854         },
 855         {
 856                 .name = "ftdi_layout_init",
 857                 .handler = &ftdi_handle_layout_init_command,
 858                 .mode = COMMAND_CONFIG,
 859                 .help = "initialize the FTDI GPIO signals used "
 860                         "to control output-enables and reset signals",
 861                 .usage = "data direction",
 862         },
 863         {
 864                 .name = "ftdi_layout_signal",
 865                 .handler = &ftdi_handle_layout_signal_command,
 866                 .mode = COMMAND_ANY,
 867                 .help = "define a signal controlled by one or more FTDI GPIO as data "
 868                         "and/or output enable",
 869                 .usage = "name [-data mask|-ndata mask] [-oe mask|-noe mask] [-alias|-nalias name]",
 870         },
 871         {
 872                 .name = "ftdi_set_signal",
 873                 .handler = &ftdi_handle_set_signal_command,
 874                 .mode = COMMAND_EXEC,
 875                 .help = "control a layout-specific signal",
 876                 .usage = "name (1|0|z)",
 877         },
 878         {
 879                 .name = "ftdi_vid_pid",
 880                 .handler = &ftdi_handle_vid_pid_command,
 881                 .mode = COMMAND_CONFIG,
 882                 .help = "the vendor ID and product ID of the FTDI device",
 883                 .usage = "(vid pid)* ",
 884         },
 885         COMMAND_REGISTRATION_DONE
 886 };
 887
 888 static int create_default_signal(const char *name, uint16_t data_mask)
 889 {
 890         struct signal *sig = create_signal(name);
 891         if (!sig) {
 892                 LOG_ERROR("failed to create signal %s", name);
 893                 return ERROR_FAIL;
 894         }
 895         sig->invert_data = false;
 896         sig->data_mask = data_mask;
 897         sig->invert_oe = false;
 898         sig->oe_mask = 0;
 899
 900         return ERROR_OK;
 901 }
 902
 903 static int create_signals(void)
 904 {
 905         if (create_default_signal("TCK", 0x01) != ERROR_OK)
 906                 return ERROR_FAIL;
 907         if (create_default_signal("TDI", 0x02) != ERROR_OK)
 908                 return ERROR_FAIL;
 909         if (create_default_signal("TDO", 0x04) != ERROR_OK)
 910                 return ERROR_FAIL;
 911         if (create_default_signal("TMS", 0x08) != ERROR_OK)
 912                 return ERROR_FAIL;
 913         return ERROR_OK;
 914 }
 915
 916 static int ftdi_swd_init(void)
 917 {
 918         LOG_INFO("FTDI SWD mode enabled");
 919         swd_mode = true;
 920
 921         if (create_signals() != ERROR_OK)
 922                 return ERROR_FAIL;
 923
 924         swd_cmd_queue_alloced = 10;
 925         swd_cmd_queue = malloc(swd_cmd_queue_alloced * sizeof(*swd_cmd_queue));
 926
 927         return swd_cmd_queue != NULL ? ERROR_OK : ERROR_FAIL;
 928 }
 929
 930 static void ftdi_swd_swdio_en(bool enable)
 931 {
 932         struct signal *oe = find_signal_by_name("SWDIO_OE");
 933         if (oe)
 934                 ftdi_set_signal(oe, enable ? '1' : '0');
 935 }
 936
 937 /**
 938  * Flush the MPSSE queue and process the SWD transaction queue
 939  * @param dap
 940  * @return
 941  */
 942 static int ftdi_swd_run_queue(struct adiv5_dap *dap)
 943 {
 944         LOG_DEBUG("Executing %zu queued transactions", swd_cmd_queue_length);
 945         int retval;
 946         struct signal *led = find_signal_by_name("LED");
 947
 948         if (queued_retval != ERROR_OK) {
 949                 LOG_DEBUG("Skipping due to previous errors: %d", queued_retval);
 950                 goto skip;
 951         }
 952
 953         /* A transaction must be followed by another transaction or at least 8 idle cycles to
 954          * ensure that data is clocked through the AP. */
 955         mpsse_clock_data_out(mpsse_ctx, NULL, 0, 8, SWD_MODE);
 956
 957         /* Terminate the "blink", if the current layout has that feature */
 958         if (led)
 959                 ftdi_set_signal(led, '0');
 960
 961         queued_retval = mpsse_flush(mpsse_ctx);
 962         if (queued_retval != ERROR_OK) {
 963                 LOG_ERROR("MPSSE failed");
 964                 goto skip;
 965         }
 966
 967         for (size_t i = 0; i < swd_cmd_queue_length; i++) {
 968                 int ack = buf_get_u32(&swd_cmd_queue[i].trn_ack_data_parity_trn, 1, 3);
 969
 970                 LOG_DEBUG("%s %s %s reg %X = %08"PRIx32,
 971                                 ack == SWD_ACK_OK ? "OK" : ack == SWD_ACK_WAIT ? "WAIT" : ack == SWD_ACK_FAULT ? "FAULT" : "JUNK",
 972                                 swd_cmd_queue[i].cmd & SWD_CMD_APnDP ? "AP" : "DP",
 973                                 swd_cmd_queue[i].cmd & SWD_CMD_RnW ? "read" : "write",
 974                                 (swd_cmd_queue[i].cmd & SWD_CMD_A32) >> 1,
 975                                 buf_get_u32(swd_cmd_queue[i].trn_ack_data_parity_trn,
 976                                                 1 + 3 + (swd_cmd_queue[i].cmd & SWD_CMD_RnW ? 0 : 1), 32));
 977
 978                 if (ack != SWD_ACK_OK) {
 979                         queued_retval = ack == SWD_ACK_WAIT ? ERROR_WAIT : ERROR_FAIL;
 980                         goto skip;
 981
 982                 } else if (swd_cmd_queue[i].cmd & SWD_CMD_RnW) {
 983                         uint32_t data = buf_get_u32(swd_cmd_queue[i].trn_ack_data_parity_trn, 1 + 3, 32);
 984                         int parity = buf_get_u32(swd_cmd_queue[i].trn_ack_data_parity_trn, 1 + 3 + 32, 1);
 985
 986                         if (parity != parity_u32(data)) {
 987                                 LOG_ERROR("SWD Read data parity mismatch");
 988                                 queued_retval = ERROR_FAIL;
 989                                 goto skip;
 990                         }
 991
 992                         if (swd_cmd_queue[i].dst != NULL)
 993                                 *swd_cmd_queue[i].dst = data;
 994                 }
 995         }
 996
 997 skip:
 998         swd_cmd_queue_length = 0;
 999         retval = queued_retval;
1000         queued_retval = ERROR_OK;
1001
1002         /* Queue a new "blink" */
1003         if (led && retval == ERROR_OK)
1004                 ftdi_set_signal(led, '1');
1005
1006         return retval;
1007 }
1008
1009 static void ftdi_swd_queue_cmd(struct adiv5_dap *dap, uint8_t cmd, uint32_t *dst, uint32_t data)
1010 {
1011         if (swd_cmd_queue_length >= swd_cmd_queue_alloced) {
1012                 /* Not enough room in the queue. Run the queue and increase its size for next time.
1013                  * Note that it's not possible to avoid running the queue here, because mpsse contains
1014                  * pointers into the queue which may be invalid after the realloc. */
1015                 queued_retval = ftdi_swd_run_queue(dap);
1016                 struct swd_cmd_queue_entry *q = realloc(swd_cmd_queue, swd_cmd_queue_alloced * 2 * sizeof(*swd_cmd_queue));
1017                 if (q != NULL) {
1018                         swd_cmd_queue = q;
1019                         swd_cmd_queue_alloced *= 2;
1020                         LOG_DEBUG("Increased SWD command queue to %zu elements", swd_cmd_queue_alloced);
1021                 }
1022         }
1023
1024         if (queued_retval != ERROR_OK)
1025                 return;
1026
1027         size_t i = swd_cmd_queue_length++;
1028         swd_cmd_queue[i].cmd = cmd | SWD_CMD_START | SWD_CMD_PARK;
1029
1030         mpsse_clock_data_out(mpsse_ctx, &swd_cmd_queue[i].cmd, 0, 8, SWD_MODE);
1031
1032         if (swd_cmd_queue[i].cmd & SWD_CMD_RnW) {
1033                 /* Queue a read transaction */
1034                 swd_cmd_queue[i].dst = dst;
1035
1036                 ftdi_swd_swdio_en(false);
1037                 mpsse_clock_data_in(mpsse_ctx, swd_cmd_queue[i].trn_ack_data_parity_trn,
1038                                 0, 1 + 3 + 32 + 1 + 1, SWD_MODE);
1039                 ftdi_swd_swdio_en(true);
1040         } else {
1041                 /* Queue a write transaction */
1042                 ftdi_swd_swdio_en(false);
1043
1044                 mpsse_clock_data_in(mpsse_ctx, swd_cmd_queue[i].trn_ack_data_parity_trn,
1045                                 0, 1 + 3 + 1, SWD_MODE);
1046
1047                 ftdi_swd_swdio_en(true);
1048
1049                 buf_set_u32(swd_cmd_queue[i].trn_ack_data_parity_trn, 1 + 3 + 1, 32, data);
1050                 buf_set_u32(swd_cmd_queue[i].trn_ack_data_parity_trn, 1 + 3 + 1 + 32, 1, parity_u32(data));
1051
1052                 mpsse_clock_data_out(mpsse_ctx, swd_cmd_queue[i].trn_ack_data_parity_trn,
1053                                 1 + 3 + 1, 32 + 1, SWD_MODE);
1054         }
1055
1056         /* Insert idle cycles after AP accesses to avoid WAIT */
1057         if (cmd & SWD_CMD_APnDP)
1058                 mpsse_clock_data_out(mpsse_ctx, NULL, 0, dap->memaccess_tck, SWD_MODE);
1059
1060 }
1061
1062 static void ftdi_swd_read_reg(struct adiv5_dap *dap, uint8_t cmd, uint32_t *value)
1063 {
1064         assert(cmd & SWD_CMD_RnW);
1065         ftdi_swd_queue_cmd(dap, cmd, value, 0);
1066 }
1067
1068 static void ftdi_swd_write_reg(struct adiv5_dap *dap, uint8_t cmd, uint32_t value)
1069 {
1070         assert(!(cmd & SWD_CMD_RnW));
1071         ftdi_swd_queue_cmd(dap, cmd, NULL, value);
1072 }
1073
1074 static int_least32_t ftdi_swd_frequency(struct adiv5_dap *dap, int_least32_t hz)
1075 {
1076         if (hz > 0)
1077                 freq = mpsse_set_frequency(mpsse_ctx, hz);
1078
1079         return freq;
1080 }
1081
1082 static int ftdi_swd_switch_seq(struct adiv5_dap *dap, enum swd_special_seq seq)
1083 {
1084         switch (seq) {
1085         case LINE_RESET:
1086                 LOG_DEBUG("SWD line reset");
1087                 mpsse_clock_data_out(mpsse_ctx, swd_seq_line_reset, 0, swd_seq_line_reset_len, SWD_MODE);
1088                 break;
1089         case JTAG_TO_SWD:
1090                 LOG_DEBUG("JTAG-to-SWD");
1091                 mpsse_clock_data_out(mpsse_ctx, swd_seq_jtag_to_swd, 0, swd_seq_jtag_to_swd_len, SWD_MODE);
1092                 break;
1093         case SWD_TO_JTAG:
1094                 LOG_DEBUG("SWD-to-JTAG");
1095                 mpsse_clock_data_out(mpsse_ctx, swd_seq_swd_to_jtag, 0, swd_seq_swd_to_jtag_len, SWD_MODE);
1096                 break;
1097         default:
1098                 LOG_ERROR("Sequence %d not supported", seq);
1099                 return ERROR_FAIL;
1100         }
1101
1102         return ERROR_OK;
1103 }
1104
1105 static const struct swd_driver ftdi_swd = {
1106         .init = ftdi_swd_init,
1107         .frequency = ftdi_swd_frequency,
1108         .switch_seq = ftdi_swd_switch_seq,
1109         .read_reg = ftdi_swd_read_reg,
1110         .write_reg = ftdi_swd_write_reg,
1111         .run = ftdi_swd_run_queue,
1112 };
1113
1114 static const char * const ftdi_transports[] = { "jtag", "swd", NULL };
1115
1116 struct jtag_interface ftdi_interface = {
1117         .name = "ftdi",
1118         .supported = DEBUG_CAP_TMS_SEQ,
1119         .commands = ftdi_command_handlers,
1120         .transports = ftdi_transports,
1121         .swd = &ftdi_swd,
1122
1123         .init = ftdi_initialize,
1124         .quit = ftdi_quit,
1125         .speed = ftdi_speed,
1126         .speed_div = ftdi_speed_div,
1127         .khz = ftdi_khz,
1128         .execute_queue = ftdi_execute_queue,
1129 };