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   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Juergen Stuber <juergen@jstuber.net>            *
   3  *   based on Dominic Rath's and Benedikt Sauter's usbprog.c               *
   4  *                                                                         *
   5  *   Copyright (C) 2008 by Spencer Oliver                                  *
   6  *   spen@spen-soft.co.uk                                                  *
   7  *                                                                         *
   8  *   Copyright (C) 2011 by Jean-Christophe PLAGNIOL-VIILARD                *
   9  *   plagnioj@jcrosoft.com                                                 *
  10  *                                                                         *
  11  *   Copyright (C) 2015 by Marc Schink                                     *
  12  *   openocd-dev@marcschink.de                                             *
  13  *                                                                         *
  14  *   Copyright (C) 2015 by Paul Fertser                                    *
  15  *   fercerpav@gmail.com                                                   *
  16  *                                                                         *
  17  *   This program is free software; you can redistribute it and/or modify  *
  18  *   it under the terms of the GNU General Public License as published by  *
  19  *   the Free Software Foundation; either version 2 of the License, or     *
  20  *   (at your option) any later version.                                   *
  21  *                                                                         *
  22  *   This program is distributed in the hope that it will be useful,       *
  23  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  24  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  25  *   GNU General Public License for more details.                          *
  26  *                                                                         *
  27  *   You should have received a copy of the GNU General Public License     *
  28  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  29  ***************************************************************************/
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include "config.h"
  33 #endif
  34
  35 #include <stdint.h>
  36 #include <math.h>
  37
  38 #include <jtag/interface.h>
  39 #include <jtag/swd.h>
  40 #include <jtag/commands.h>
  41 #include <jtag/drivers/jtag_usb_common.h>
  42 #include <target/cortex_m.h>
  43
  44 #include <libjaylink/libjaylink.h>
  45
  46 static struct jaylink_context *jayctx;
  47 static struct jaylink_device_handle *devh;
  48 static struct jaylink_connection conn;
  49 static struct jaylink_connection connlist[JAYLINK_MAX_CONNECTIONS];
  50 static enum jaylink_jtag_version jtag_command_version;
  51 static uint8_t caps[JAYLINK_DEV_EXT_CAPS_SIZE];
  52
  53 static uint32_t serial_number;
  54 static bool use_serial_number;
  55 static bool use_usb_location;
  56 static enum jaylink_usb_address usb_address;
  57 static bool use_usb_address;
  58 static enum jaylink_target_interface iface = JAYLINK_TIF_JTAG;
  59 static bool trace_enabled;
  60
  61 #define JLINK_MAX_SPEED                 12000
  62 #define JLINK_TAP_BUFFER_SIZE   2048
  63
  64 static unsigned int swd_buffer_size = JLINK_TAP_BUFFER_SIZE;
  65
  66 /* Maximum SWO frequency deviation. */
  67 #define SWO_MAX_FREQ_DEV        0.03
  68
  69 /* 256 byte non-volatile memory */
  70 struct device_config {
  71         uint8_t usb_address;
  72         /* 0ffset 0x01 to 0x03 */
  73         uint8_t reserved_1[3];
  74         uint32_t target_power;
  75         /* 0ffset 0x08 to 0x1f */
  76         uint8_t reserved_2[24];
  77         /* IP only for J-Link Pro */
  78         uint8_t ip_address[4];
  79         uint8_t subnet_mask[4];
  80         /* 0ffset 0x28 to 0x2f */
  81         uint8_t reserved_3[8];
  82         uint8_t mac_address[6];
  83         /* 0ffset 0x36 to 0xff */
  84         uint8_t reserved_4[202];
  85 } __attribute__ ((packed));
  86
  87 static struct device_config config;
  88 static struct device_config tmp_config;
  89
  90 /* Queue command functions */
  91 static void jlink_end_state(tap_state_t state);
  92 static void jlink_state_move(void);
  93 static void jlink_path_move(int num_states, tap_state_t *path);
  94 static void jlink_stableclocks(int num_cycles);
  95 static void jlink_runtest(int num_cycles);
  96 static void jlink_reset(int trst, int srst);
  97 static int jlink_reset_safe(int trst, int srst);
  98 static int jlink_swd_run_queue(void);
  99 static void jlink_swd_queue_cmd(uint8_t cmd, uint32_t *dst, uint32_t data, uint32_t ap_delay_clk);
 100 static int jlink_swd_switch_seq(enum swd_special_seq seq);
 101
 102 /* J-Link tap buffer functions */
 103 static void jlink_tap_init(void);
 104 static int jlink_flush(void);
 105 /**
 106  * Queue data to go out and in, flushing the queue as many times as
 107  * necessary.
 108  *
 109  * @param out A pointer to TDI data, if NULL, old stale data will be used.
 110  * @param out_offset A bit offset for TDI data.
 111  * @param tms_out A pointer to TMS data, if NULL, zeroes will be emitted.
 112  * @param tms_offset A bit offset for TMS data.
 113  * @param in A pointer to store TDO data to, if NULL the data will be discarded.
 114  * @param in_offset A bit offset for TDO data.
 115  * @param length Amount of bits to transfer out and in.
 116  *
 117  * @retval This function doesn't return any value.
 118  */
 119 static void jlink_clock_data(const uint8_t *out, unsigned out_offset,
 120                              const uint8_t *tms_out, unsigned tms_offset,
 121                              uint8_t *in, unsigned in_offset,
 122                              unsigned length);
 123
 124 static enum tap_state jlink_last_state = TAP_RESET;
 125 static int queued_retval;
 126
 127 /***************************************************************************/
 128 /* External interface implementation */
 129
 130 static void jlink_execute_stableclocks(struct jtag_command *cmd)
 131 {
 132         LOG_DEBUG_IO("stableclocks %i cycles", cmd->cmd.runtest->num_cycles);
 133         jlink_stableclocks(cmd->cmd.runtest->num_cycles);
 134 }
 135
 136 static void jlink_execute_runtest(struct jtag_command *cmd)
 137 {
 138         LOG_DEBUG_IO("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles,
 139                 cmd->cmd.runtest->end_state);
 140
 141         jlink_end_state(cmd->cmd.runtest->end_state);
 142         jlink_runtest(cmd->cmd.runtest->num_cycles);
 143 }
 144
 145 static void jlink_execute_statemove(struct jtag_command *cmd)
 146 {
 147         LOG_DEBUG_IO("statemove end in %i", cmd->cmd.statemove->end_state);
 148
 149         jlink_end_state(cmd->cmd.statemove->end_state);
 150         jlink_state_move();
 151 }
 152
 153 static void jlink_execute_pathmove(struct jtag_command *cmd)
 154 {
 155         LOG_DEBUG_IO("pathmove: %i states, end in %i",
 156                 cmd->cmd.pathmove->num_states,
 157                 cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
 158
 159         jlink_path_move(cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path);
 160 }
 161
 162 static void jlink_execute_scan(struct jtag_command *cmd)
 163 {
 164         LOG_DEBUG_IO("%s type:%d", cmd->cmd.scan->ir_scan ? "IRSCAN" : "DRSCAN",
 165                 jtag_scan_type(cmd->cmd.scan));
 166
 167         /* Make sure there are no trailing fields with num_bits == 0, or the logic below will fail. */
 168         while (cmd->cmd.scan->num_fields > 0
 169                         && cmd->cmd.scan->fields[cmd->cmd.scan->num_fields - 1].num_bits == 0) {
 170                 cmd->cmd.scan->num_fields--;
 171                 LOG_DEBUG("discarding trailing empty field");
 172         }
 173
 174         if (cmd->cmd.scan->num_fields == 0) {
 175                 LOG_DEBUG("empty scan, doing nothing");
 176                 return;
 177         }
 178
 179         if (cmd->cmd.scan->ir_scan) {
 180                 if (tap_get_state() != TAP_IRSHIFT) {
 181                         jlink_end_state(TAP_IRSHIFT);
 182                         jlink_state_move();
 183                 }
 184         } else {
 185                 if (tap_get_state() != TAP_DRSHIFT) {
 186                         jlink_end_state(TAP_DRSHIFT);
 187                         jlink_state_move();
 188                 }
 189         }
 190
 191         jlink_end_state(cmd->cmd.scan->end_state);
 192
 193         struct scan_field *field = cmd->cmd.scan->fields;
 194         unsigned scan_size = 0;
 195
 196         for (int i = 0; i < cmd->cmd.scan->num_fields; i++, field++) {
 197                 scan_size += field->num_bits;
 198                 LOG_DEBUG_IO("%s%s field %d/%d %d bits",
 199                         field->in_value ? "in" : "",
 200                         field->out_value ? "out" : "",
 201                         i,
 202                         cmd->cmd.scan->num_fields,
 203                         field->num_bits);
 204
 205                 if (i == cmd->cmd.scan->num_fields - 1 && tap_get_state() != tap_get_end_state()) {
 206                         /* Last field, and we're leaving IRSHIFT/DRSHIFT. Clock last bit during tap
 207                          * movement. This last field can't have length zero, it was checked above. */
 208                         jlink_clock_data(field->out_value,
 209                                          0,
 210                                          NULL,
 211                                          0,
 212                                          field->in_value,
 213                                          0,
 214                                          field->num_bits - 1);
 215                         uint8_t last_bit = 0;
 216                         if (field->out_value)
 217                                 bit_copy(&last_bit, 0, field->out_value, field->num_bits - 1, 1);
 218                         uint8_t tms_bits = 0x01;
 219                         jlink_clock_data(&last_bit,
 220                                          0,
 221                                          &tms_bits,
 222                                          0,
 223                                          field->in_value,
 224                                          field->num_bits - 1,
 225                                          1);
 226                         tap_set_state(tap_state_transition(tap_get_state(), 1));
 227                         jlink_clock_data(NULL,
 228                                          0,
 229                                          &tms_bits,
 230                                          1,
 231                                          NULL,
 232                                          0,
 233                                          1);
 234                         tap_set_state(tap_state_transition(tap_get_state(), 0));
 235                 } else
 236                         jlink_clock_data(field->out_value,
 237                                          0,
 238                                          NULL,
 239                                          0,
 240                                          field->in_value,
 241                                          0,
 242                                          field->num_bits);
 243         }
 244
 245         if (tap_get_state() != tap_get_end_state()) {
 246                 jlink_end_state(tap_get_end_state());
 247                 jlink_state_move();
 248         }
 249
 250         LOG_DEBUG_IO("%s scan, %i bits, end in %s",
 251                 (cmd->cmd.scan->ir_scan) ? "IR" : "DR", scan_size,
 252                 tap_state_name(tap_get_end_state()));
 253 }
 254
 255 static void jlink_execute_sleep(struct jtag_command *cmd)
 256 {
 257         LOG_DEBUG_IO("sleep %" PRIu32 "", cmd->cmd.sleep->us);
 258         jlink_flush();
 259         jtag_sleep(cmd->cmd.sleep->us);
 260 }
 261
 262 static int jlink_execute_command(struct jtag_command *cmd)
 263 {
 264         switch (cmd->type) {
 265                 case JTAG_STABLECLOCKS:
 266                         jlink_execute_stableclocks(cmd);
 267                         break;
 268                 case JTAG_RUNTEST:
 269                         jlink_execute_runtest(cmd);
 270                         break;
 271                 case JTAG_TLR_RESET:
 272                         jlink_execute_statemove(cmd);
 273                         break;
 274                 case JTAG_PATHMOVE:
 275                         jlink_execute_pathmove(cmd);
 276                         break;
 277                 case JTAG_SCAN:
 278                         jlink_execute_scan(cmd);
 279                         break;
 280                 case JTAG_SLEEP:
 281                         jlink_execute_sleep(cmd);
 282                         break;
 283                 default:
 284                         LOG_ERROR("BUG: Unknown JTAG command type encountered.");
 285                         return ERROR_JTAG_QUEUE_FAILED;
 286         }
 287
 288         return ERROR_OK;
 289 }
 290
 291 static int jlink_execute_queue(void)
 292 {
 293         int ret;
 294         struct jtag_command *cmd = jtag_command_queue;
 295
 296         while (cmd != NULL) {
 297                 ret = jlink_execute_command(cmd);
 298
 299                 if (ret != ERROR_OK)
 300                         return ret;
 301
 302                 cmd = cmd->next;
 303         }
 304
 305         return jlink_flush();
 306 }
 307
 308 static int jlink_speed(int speed)
 309 {
 310         int ret;
 311         struct jaylink_speed tmp;
 312         int max_speed;
 313
 314         if (jaylink_has_cap(caps, JAYLINK_DEV_CAP_GET_SPEEDS)) {
 315                 ret = jaylink_get_speeds(devh, &tmp);
 316
 317                 if (ret != JAYLINK_OK) {
 318                         LOG_ERROR("jaylink_get_speeds() failed: %s.",
 319                                 jaylink_strerror(ret));
 320                         return ERROR_JTAG_DEVICE_ERROR;
 321                 }
 322
 323                 tmp.freq /= 1000;
 324                 max_speed = tmp.freq / tmp.div;
 325         } else {
 326                 max_speed = JLINK_MAX_SPEED;
 327         }
 328
 329         if (!speed) {
 330                 if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_ADAPTIVE_CLOCKING)) {
 331                         LOG_ERROR("Adaptive clocking is not supported by the device.");
 332                         return ERROR_JTAG_NOT_IMPLEMENTED;
 333                 }
 334
 335                 speed = JAYLINK_SPEED_ADAPTIVE_CLOCKING;
 336         } else if (speed > max_speed) {
 337                 LOG_INFO("Reduced speed from %d kHz to %d kHz (maximum).", speed,
 338                         max_speed);
 339                 speed = max_speed;
 340         }
 341
 342         ret = jaylink_set_speed(devh, speed);
 343
 344         if (ret != JAYLINK_OK) {
 345                 LOG_ERROR("jaylink_set_speed() failed: %s.",
 346                         jaylink_strerror(ret));
 347                 return ERROR_JTAG_DEVICE_ERROR;
 348         }
 349
 350         return ERROR_OK;
 351 }
 352
 353 static int jlink_speed_div(int speed, int *khz)
 354 {
 355         *khz = speed;
 356
 357         return ERROR_OK;
 358 }
 359
 360 static int jlink_khz(int khz, int *jtag_speed)
 361 {
 362         *jtag_speed = khz;
 363
 364         return ERROR_OK;
 365 }
 366
 367 static bool read_device_config(struct device_config *cfg)
 368 {
 369         int ret;
 370
 371         ret = jaylink_read_raw_config(devh, (uint8_t *)cfg);
 372
 373         if (ret != JAYLINK_OK) {
 374                 LOG_ERROR("jaylink_read_raw_config() failed: %s.",
 375                         jaylink_strerror(ret));
 376                 return false;
 377         }
 378
 379         if (cfg->usb_address == 0xff)
 380                 cfg->usb_address = 0x00;
 381
 382         if (cfg->target_power == 0xffffffff)
 383                 cfg->target_power = 0;
 384
 385         return true;
 386 }
 387
 388 static int select_interface(void)
 389 {
 390         int ret;
 391         uint32_t interfaces;
 392
 393         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_SELECT_TIF)) {
 394                 if (iface != JAYLINK_TIF_JTAG) {
 395                         LOG_ERROR("Device supports JTAG transport only.");
 396                         return ERROR_JTAG_INIT_FAILED;
 397                 }
 398
 399                 return ERROR_OK;
 400         }
 401
 402         ret = jaylink_get_available_interfaces(devh, &interfaces);
 403
 404         if (ret != JAYLINK_OK) {
 405                 LOG_ERROR("jaylink_get_available_interfaces() failed: %s.",
 406                         jaylink_strerror(ret));
 407                 return ERROR_JTAG_INIT_FAILED;
 408         }
 409
 410         if (!(interfaces & (1 << iface))) {
 411                 LOG_ERROR("Selected transport is not supported by the device.");
 412                 return ERROR_JTAG_INIT_FAILED;
 413         }
 414
 415         ret = jaylink_select_interface(devh, iface, NULL);
 416
 417         if (ret < 0) {
 418                 LOG_ERROR("jaylink_select_interface() failed: %s.",
 419                         jaylink_strerror(ret));
 420                 return ERROR_JTAG_INIT_FAILED;
 421         }
 422
 423         return ERROR_OK;
 424 }
 425
 426 static int jlink_register(void)
 427 {
 428         int ret;
 429         size_t i;
 430         bool handle_found;
 431         size_t count;
 432
 433         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_REGISTER))
 434                 return ERROR_OK;
 435
 436         ret = jaylink_register(devh, &conn, connlist, &count);
 437
 438         if (ret != JAYLINK_OK) {
 439                 LOG_ERROR("jaylink_register() failed: %s.", jaylink_strerror(ret));
 440                 return ERROR_FAIL;
 441         }
 442
 443         handle_found = false;
 444
 445         for (i = 0; i < count; i++) {
 446                 if (connlist[i].handle == conn.handle) {
 447                         handle_found = true;
 448                         break;
 449                 }
 450         }
 451
 452         if (!handle_found) {
 453                 LOG_ERROR("Registration failed: maximum number of connections on the "
 454                         "device reached.");
 455                 return ERROR_FAIL;
 456         }
 457
 458         return ERROR_OK;
 459 }
 460
 461 /*
 462  * Adjust the SWD transaction buffer size depending on the free device internal
 463  * memory. This ensures that the SWD transactions sent to the device do not
 464  * exceed the internal memory of the device.
 465  */
 466 static bool adjust_swd_buffer_size(void)
 467 {
 468         int ret;
 469         uint32_t tmp;
 470
 471         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_GET_FREE_MEMORY))
 472                 return true;
 473
 474         ret = jaylink_get_free_memory(devh, &tmp);
 475
 476         if (ret != JAYLINK_OK) {
 477                 LOG_ERROR("jaylink_get_free_memory() failed: %s.",
 478                         jaylink_strerror(ret));
 479                 return false;
 480         }
 481
 482         if (tmp < 143) {
 483                 LOG_ERROR("Not enough free device internal memory: %" PRIu32 " bytes.", tmp);
 484                 return false;
 485         }
 486
 487         tmp = MIN(JLINK_TAP_BUFFER_SIZE, (tmp - 16) / 2);
 488
 489         if (tmp != swd_buffer_size) {
 490                 swd_buffer_size = tmp;
 491                 LOG_DEBUG("Adjusted SWD transaction buffer size to %u bytes.",
 492                         swd_buffer_size);
 493         }
 494
 495         return true;
 496 }
 497
 498 static int jaylink_log_handler(const struct jaylink_context *ctx,
 499                 enum jaylink_log_level level, const char *format, va_list args,
 500                 void *user_data)
 501 {
 502         enum log_levels tmp;
 503
 504         switch (level) {
 505         case JAYLINK_LOG_LEVEL_ERROR:
 506                 tmp = LOG_LVL_ERROR;
 507                 break;
 508         case JAYLINK_LOG_LEVEL_WARNING:
 509                 tmp = LOG_LVL_WARNING;
 510                 break;
 511         /*
 512          * Forward info messages to the debug output because they are more verbose
 513          * than info messages of OpenOCD.
 514          */
 515         case JAYLINK_LOG_LEVEL_INFO:
 516         case JAYLINK_LOG_LEVEL_DEBUG:
 517                 tmp = LOG_LVL_DEBUG;
 518                 break;
 519         case JAYLINK_LOG_LEVEL_DEBUG_IO:
 520                 tmp = LOG_LVL_DEBUG_IO;
 521                 break;
 522         default:
 523                 tmp = LOG_LVL_WARNING;
 524         }
 525
 526         log_vprintf_lf(tmp, __FILE__, __LINE__, __func__, format, args);
 527
 528         return 0;
 529 }
 530
 531 static bool jlink_usb_location_equal(struct jaylink_device *dev)
 532 {
 533         int retval;
 534         uint8_t bus;
 535         uint8_t *ports;
 536         size_t num_ports;
 537         bool equal = false;
 538
 539         retval = jaylink_device_get_usb_bus_ports(dev, &bus, &ports, &num_ports);
 540
 541         if (retval == JAYLINK_ERR_NOT_SUPPORTED) {
 542                 return false;
 543         } else if (retval != JAYLINK_OK) {
 544                 LOG_WARNING("jaylink_device_get_usb_bus_ports() failed: %s.",
 545                         jaylink_strerror(retval));
 546                 return false;
 547         }
 548
 549         equal = jtag_usb_location_equal(bus, ports,     num_ports);
 550         free(ports);
 551
 552         return equal;
 553 }
 554
 555
 556 static int jlink_init(void)
 557 {
 558         int ret;
 559         struct jaylink_device **devs;
 560         unsigned int i;
 561         bool found_device;
 562         uint32_t tmp;
 563         char *firmware_version;
 564         struct jaylink_hardware_version hwver;
 565         struct jaylink_hardware_status hwstatus;
 566         enum jaylink_usb_address address;
 567         size_t length;
 568         size_t num_devices;
 569         uint32_t host_interfaces;
 570
 571         LOG_DEBUG("Using libjaylink %s (compiled with %s).",
 572                 jaylink_version_package_get_string(), JAYLINK_VERSION_PACKAGE_STRING);
 573
 574         if (!jaylink_library_has_cap(JAYLINK_CAP_HIF_USB) && use_usb_address) {
 575                 LOG_ERROR("J-Link driver does not support USB devices.");
 576                 return ERROR_JTAG_INIT_FAILED;
 577         }
 578
 579         ret = jaylink_init(&jayctx);
 580
 581         if (ret != JAYLINK_OK) {
 582                 LOG_ERROR("jaylink_init() failed: %s.", jaylink_strerror(ret));
 583                 return ERROR_JTAG_INIT_FAILED;
 584         }
 585
 586         ret = jaylink_log_set_callback(jayctx, &jaylink_log_handler, NULL);
 587
 588         if (ret != JAYLINK_OK) {
 589                 LOG_ERROR("jaylink_log_set_callback() failed: %s.",
 590                         jaylink_strerror(ret));
 591                 jaylink_exit(jayctx);
 592                 return ERROR_JTAG_INIT_FAILED;
 593         }
 594
 595         host_interfaces = JAYLINK_HIF_USB;
 596
 597         if (use_serial_number)
 598                 host_interfaces |= JAYLINK_HIF_TCP;
 599
 600         ret = jaylink_discovery_scan(jayctx, host_interfaces);
 601
 602         if (ret != JAYLINK_OK) {
 603                 LOG_ERROR("jaylink_discovery_scan() failed: %s.",
 604                         jaylink_strerror(ret));
 605                 jaylink_exit(jayctx);
 606                 return ERROR_JTAG_INIT_FAILED;
 607         }
 608
 609         ret = jaylink_get_devices(jayctx, &devs, &num_devices);
 610
 611         if (ret != JAYLINK_OK) {
 612                 LOG_ERROR("jaylink_get_devices() failed: %s.", jaylink_strerror(ret));
 613                 jaylink_exit(jayctx);
 614                 return ERROR_JTAG_INIT_FAILED;
 615         }
 616
 617         use_usb_location = (jtag_usb_get_location() != NULL);
 618
 619         if (!use_serial_number && !use_usb_address && !use_usb_location && num_devices > 1) {
 620                 LOG_ERROR("Multiple devices found, specify the desired device.");
 621                 jaylink_free_devices(devs, true);
 622                 jaylink_exit(jayctx);
 623                 return ERROR_JTAG_INIT_FAILED;
 624         }
 625
 626         found_device = false;
 627
 628         for (i = 0; devs[i]; i++) {
 629                 struct jaylink_device *dev = devs[i];
 630
 631                 if (use_serial_number) {
 632                         ret = jaylink_device_get_serial_number(dev, &tmp);
 633
 634                         if (ret == JAYLINK_ERR_NOT_AVAILABLE) {
 635                                 continue;
 636                         } else if (ret != JAYLINK_OK) {
 637                                 LOG_WARNING("jaylink_device_get_serial_number() failed: %s.",
 638                                         jaylink_strerror(ret));
 639                                 continue;
 640                         }
 641
 642                         if (serial_number != tmp)
 643                                 continue;
 644                 }
 645
 646                 if (use_usb_address) {
 647                         ret = jaylink_device_get_usb_address(dev, &address);
 648
 649                         if (ret == JAYLINK_ERR_NOT_SUPPORTED) {
 650                                 continue;
 651                         } else if (ret != JAYLINK_OK) {
 652                                 LOG_WARNING("jaylink_device_get_usb_address() failed: %s.",
 653                                         jaylink_strerror(ret));
 654                                 continue;
 655                         }
 656
 657                         if (usb_address != address)
 658                                 continue;
 659                 }
 660
 661                 if (use_usb_location && !jlink_usb_location_equal(dev))
 662                         continue;
 663
 664                 ret = jaylink_open(dev, &devh);
 665
 666                 if (ret == JAYLINK_OK) {
 667                         found_device = true;
 668                         break;
 669                 }
 670
 671                 LOG_ERROR("Failed to open device: %s.", jaylink_strerror(ret));
 672         }
 673
 674         jaylink_free_devices(devs, true);
 675
 676         if (!found_device) {
 677                 LOG_ERROR("No J-Link device found.");
 678                 jaylink_exit(jayctx);
 679                 return ERROR_JTAG_INIT_FAILED;
 680         }
 681
 682         /*
 683          * Be careful with changing the following initialization sequence because
 684          * some devices are known to be sensitive regarding the order.
 685          */
 686
 687         ret = jaylink_get_firmware_version(devh, &firmware_version, &length);
 688
 689         if (ret != JAYLINK_OK) {
 690                 LOG_ERROR("jaylink_get_firmware_version() failed: %s.",
 691                         jaylink_strerror(ret));
 692                 jaylink_close(devh);
 693                 jaylink_exit(jayctx);
 694                 return ERROR_JTAG_INIT_FAILED;
 695         } else if (length > 0) {
 696                 LOG_INFO("%s", firmware_version);
 697                 free(firmware_version);
 698         } else {
 699                 LOG_WARNING("Device responds empty firmware version string.");
 700         }
 701
 702         memset(caps, 0, JAYLINK_DEV_EXT_CAPS_SIZE);
 703         ret = jaylink_get_caps(devh, caps);
 704
 705         if (ret != JAYLINK_OK) {
 706                 LOG_ERROR("jaylink_get_caps() failed: %s.", jaylink_strerror(ret));
 707                 jaylink_close(devh);
 708                 jaylink_exit(jayctx);
 709                 return ERROR_JTAG_INIT_FAILED;
 710         }
 711
 712         if (jaylink_has_cap(caps, JAYLINK_DEV_CAP_GET_EXT_CAPS)) {
 713                 ret = jaylink_get_extended_caps(devh, caps);
 714
 715                 if (ret != JAYLINK_OK) {
 716                         LOG_ERROR("jaylink_get_extended_caps() failed:  %s.",
 717                                 jaylink_strerror(ret));
 718                         jaylink_close(devh);
 719                         jaylink_exit(jayctx);
 720                         return ERROR_JTAG_INIT_FAILED;
 721                 }
 722         }
 723
 724         jtag_command_version = JAYLINK_JTAG_VERSION_2;
 725
 726         if (jaylink_has_cap(caps, JAYLINK_DEV_CAP_GET_HW_VERSION)) {
 727                 ret = jaylink_get_hardware_version(devh, &hwver);
 728
 729                 if (ret != JAYLINK_OK) {
 730                         LOG_ERROR("Failed to retrieve hardware version: %s.",
 731                                 jaylink_strerror(ret));
 732                         jaylink_close(devh);
 733                         jaylink_exit(jayctx);
 734                         return ERROR_JTAG_INIT_FAILED;
 735                 }
 736
 737                 LOG_INFO("Hardware version: %u.%02u", hwver.major, hwver.minor);
 738
 739                 if (hwver.major >= 5)
 740                         jtag_command_version = JAYLINK_JTAG_VERSION_3;
 741         }
 742
 743         if (iface == JAYLINK_TIF_SWD) {
 744                 /*
 745                  * Adjust the SWD transaction buffer size in case there is already
 746                  * allocated memory on the device. This happens for example if the
 747                  * memory for SWO capturing is still allocated because the software
 748                  * which used the device before has not been shut down properly.
 749                  */
 750                 if (!adjust_swd_buffer_size()) {
 751                         jaylink_close(devh);
 752                         jaylink_exit(jayctx);
 753                         return ERROR_JTAG_INIT_FAILED;
 754                 }
 755         }
 756
 757         if (jaylink_has_cap(caps, JAYLINK_DEV_CAP_READ_CONFIG)) {
 758                 if (!read_device_config(&config)) {
 759                         LOG_ERROR("Failed to read device configuration data.");
 760                         jaylink_close(devh);
 761                         jaylink_exit(jayctx);
 762                         return ERROR_JTAG_INIT_FAILED;
 763                 }
 764
 765                 memcpy(&tmp_config, &config, sizeof(struct device_config));
 766         }
 767
 768         ret = jaylink_get_hardware_status(devh, &hwstatus);
 769
 770         if (ret != JAYLINK_OK) {
 771                 LOG_ERROR("jaylink_get_hardware_status() failed: %s.",
 772                         jaylink_strerror(ret));
 773                 jaylink_close(devh);
 774                 jaylink_exit(jayctx);
 775                 return ERROR_JTAG_INIT_FAILED;
 776         }
 777
 778         LOG_INFO("VTarget = %u.%03u V", hwstatus.target_voltage / 1000,
 779                 hwstatus.target_voltage % 1000);
 780
 781         conn.handle = 0;
 782         conn.pid = 0;
 783         strcpy(conn.hid, "0.0.0.0");
 784         conn.iid = 0;
 785         conn.cid = 0;
 786
 787         ret = jlink_register();
 788
 789         if (ret != ERROR_OK) {
 790                 jaylink_close(devh);
 791                 jaylink_exit(jayctx);
 792                 return ERROR_JTAG_INIT_FAILED;
 793         }
 794
 795         ret = select_interface();
 796
 797         if (ret != ERROR_OK) {
 798                 jaylink_close(devh);
 799                 jaylink_exit(jayctx);
 800                 return ret;
 801         }
 802
 803         jlink_reset(0, 0);
 804         jtag_sleep(3000);
 805         jlink_tap_init();
 806
 807         jlink_speed(jtag_get_speed_khz());
 808
 809         if (iface == JAYLINK_TIF_JTAG) {
 810                 /*
 811                  * J-Link devices with firmware version v5 and v6 seems to have an issue
 812                  * if the first tap move is not divisible by 8, so we send a TLR on
 813                  * first power up.
 814                  */
 815                 uint8_t tms = 0xff;
 816                 jlink_clock_data(NULL, 0, &tms, 0, NULL, 0, 8);
 817
 818                 jlink_flush();
 819         }
 820
 821         return ERROR_OK;
 822 }
 823
 824 static int jlink_quit(void)
 825 {
 826         int ret;
 827         size_t count;
 828
 829         if (trace_enabled) {
 830                 ret = jaylink_swo_stop(devh);
 831
 832                 if (ret != JAYLINK_OK)
 833                         LOG_ERROR("jaylink_swo_stop() failed: %s.", jaylink_strerror(ret));
 834         }
 835
 836         if (jaylink_has_cap(caps, JAYLINK_DEV_CAP_REGISTER)) {
 837                 ret = jaylink_unregister(devh, &conn, connlist, &count);
 838
 839                 if (ret != JAYLINK_OK)
 840                         LOG_ERROR("jaylink_unregister() failed: %s.",
 841                                 jaylink_strerror(ret));
 842         }
 843
 844         jaylink_close(devh);
 845         jaylink_exit(jayctx);
 846
 847         return ERROR_OK;
 848 }
 849
 850 /***************************************************************************/
 851 /* Queue command implementations */
 852
 853 static void jlink_end_state(tap_state_t state)
 854 {
 855         if (tap_is_state_stable(state))
 856                 tap_set_end_state(state);
 857         else {
 858                 LOG_ERROR("BUG: %i is not a valid end state", state);
 859                 exit(-1);
 860         }
 861 }
 862
 863 /* Goes to the end state. */
 864 static void jlink_state_move(void)
 865 {
 866         uint8_t tms_scan;
 867         uint8_t tms_scan_bits;
 868
 869         tms_scan = tap_get_tms_path(tap_get_state(), tap_get_end_state());
 870         tms_scan_bits = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
 871
 872         jlink_clock_data(NULL, 0, &tms_scan, 0, NULL, 0, tms_scan_bits);
 873
 874         tap_set_state(tap_get_end_state());
 875 }
 876
 877 static void jlink_path_move(int num_states, tap_state_t *path)
 878 {
 879         int i;
 880         uint8_t tms = 0xff;
 881
 882         for (i = 0; i < num_states; i++) {
 883                 if (path[i] == tap_state_transition(tap_get_state(), false))
 884                         jlink_clock_data(NULL, 0, NULL, 0, NULL, 0, 1);
 885                 else if (path[i] == tap_state_transition(tap_get_state(), true))
 886                         jlink_clock_data(NULL, 0, &tms, 0, NULL, 0, 1);
 887                 else {
 888                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition.",
 889                                 tap_state_name(tap_get_state()), tap_state_name(path[i]));
 890                         exit(-1);
 891                 }
 892
 893                 tap_set_state(path[i]);
 894         }
 895
 896         tap_set_end_state(tap_get_state());
 897 }
 898
 899 static void jlink_stableclocks(int num_cycles)
 900 {
 901         int i;
 902
 903         uint8_t tms = tap_get_state() == TAP_RESET;
 904         /* Execute num_cycles. */
 905         for (i = 0; i < num_cycles; i++)
 906                 jlink_clock_data(NULL, 0, &tms, 0, NULL, 0, 1);
 907 }
 908
 909 static void jlink_runtest(int num_cycles)
 910 {
 911         tap_state_t saved_end_state = tap_get_end_state();
 912
 913         /* Only do a state_move when we're not already in IDLE. */
 914         if (tap_get_state() != TAP_IDLE) {
 915                 jlink_end_state(TAP_IDLE);
 916                 jlink_state_move();
 917                 /* num_cycles--; */
 918         }
 919
 920         jlink_stableclocks(num_cycles);
 921
 922         /* Finish in end_state. */
 923         jlink_end_state(saved_end_state);
 924
 925         if (tap_get_state() != tap_get_end_state())
 926                 jlink_state_move();
 927 }
 928
 929 static void jlink_reset(int trst, int srst)
 930 {
 931         LOG_DEBUG("TRST: %i, SRST: %i.", trst, srst);
 932
 933         /* Signals are active low. */
 934         if (srst == 0)
 935                 jaylink_set_reset(devh);
 936
 937         if (srst == 1)
 938                 jaylink_clear_reset(devh);
 939
 940         if (trst == 1)
 941                 jaylink_jtag_clear_trst(devh);
 942
 943         if (trst == 0)
 944                 jaylink_jtag_set_trst(devh);
 945 }
 946
 947 static int jlink_reset_safe(int trst, int srst)
 948 {
 949         jlink_flush();
 950         jlink_reset(trst, srst);
 951         return jlink_flush();
 952 }
 953
 954 COMMAND_HANDLER(jlink_usb_command)
 955 {
 956         int tmp;
 957
 958         if (CMD_ARGC != 1) {
 959                 command_print(CMD, "Need exactly one argument for jlink usb.");
 960                 return ERROR_COMMAND_SYNTAX_ERROR;
 961         }
 962
 963         if (sscanf(CMD_ARGV[0], "%i", &tmp) != 1) {
 964                 command_print(CMD, "Invalid USB address: %s.", CMD_ARGV[0]);
 965                 return ERROR_FAIL;
 966         }
 967
 968         if (tmp < JAYLINK_USB_ADDRESS_0 || tmp > JAYLINK_USB_ADDRESS_3) {
 969                 command_print(CMD, "Invalid USB address: %s.", CMD_ARGV[0]);
 970                 return ERROR_FAIL;
 971         }
 972
 973         usb_address = tmp;
 974
 975         use_serial_number = false;
 976         use_usb_address = true;
 977
 978         return ERROR_OK;
 979 }
 980
 981 COMMAND_HANDLER(jlink_serial_command)
 982 {
 983         int ret;
 984
 985         if (CMD_ARGC != 1) {
 986                 command_print(CMD, "Need exactly one argument for jlink serial.");
 987                 return ERROR_COMMAND_SYNTAX_ERROR;
 988         }
 989
 990         ret = jaylink_parse_serial_number(CMD_ARGV[0], &serial_number);
 991
 992         if (ret == JAYLINK_ERR) {
 993                 command_print(CMD, "Invalid serial number: %s.", CMD_ARGV[0]);
 994                 return ERROR_FAIL;
 995         } else if (ret != JAYLINK_OK) {
 996                 command_print(CMD, "jaylink_parse_serial_number() failed: %s.",
 997                         jaylink_strerror(ret));
 998                 return ERROR_FAIL;
 999         }
1000
1001         use_serial_number = true;
1002         use_usb_address = false;
1003
1004         return ERROR_OK;
1005 }
1006
1007 COMMAND_HANDLER(jlink_handle_hwstatus_command)
1008 {
1009         int ret;
1010         struct jaylink_hardware_status status;
1011
1012         ret = jaylink_get_hardware_status(devh, &status);
1013
1014         if (ret != JAYLINK_OK) {
1015                 command_print(CMD, "jaylink_get_hardware_status() failed: %s.",
1016                         jaylink_strerror(ret));
1017                 return ERROR_FAIL;
1018         }
1019
1020         command_print(CMD, "VTarget = %u.%03u V",
1021                 status.target_voltage / 1000, status.target_voltage % 1000);
1022
1023         command_print(CMD, "TCK = %u TDI = %u TDO = %u TMS = %u SRST = %u "
1024                 "TRST = %u", status.tck, status.tdi, status.tdo, status.tms,
1025                 status.tres, status.trst);
1026
1027         if (status.target_voltage < 1500)
1028                 command_print(CMD, "Target voltage too low. Check target power.");
1029
1030         return ERROR_OK;
1031 }
1032
1033 COMMAND_HANDLER(jlink_handle_free_memory_command)
1034 {
1035         int ret;
1036         uint32_t tmp;
1037
1038         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_GET_FREE_MEMORY)) {
1039                 command_print(CMD, "Retrieval of free memory is not supported by "
1040                         "the device.");
1041                 return ERROR_OK;
1042         }
1043
1044         ret = jaylink_get_free_memory(devh, &tmp);
1045
1046         if (ret != JAYLINK_OK) {
1047                 command_print(CMD, "jaylink_get_free_memory() failed: %s.",
1048                         jaylink_strerror(ret));
1049                 return ERROR_FAIL;
1050         }
1051
1052         command_print(CMD, "Device has %" PRIu32 " bytes of free memory.", tmp);
1053
1054         return ERROR_OK;
1055 }
1056
1057 COMMAND_HANDLER(jlink_handle_jlink_jtag_command)
1058 {
1059         int tmp;
1060         int version;
1061
1062         if (!CMD_ARGC) {
1063                 switch (jtag_command_version) {
1064                         case JAYLINK_JTAG_VERSION_2:
1065                                 version = 2;
1066                                 break;
1067                         case JAYLINK_JTAG_VERSION_3:
1068                                 version = 3;
1069                                 break;
1070                         default:
1071                                 return ERROR_FAIL;
1072                 }
1073
1074                 command_print(CMD, "JTAG command version: %i", version);
1075         } else if (CMD_ARGC == 1) {
1076                 if (sscanf(CMD_ARGV[0], "%i", &tmp) != 1) {
1077                         command_print(CMD, "Invalid argument: %s.", CMD_ARGV[0]);
1078                         return ERROR_COMMAND_SYNTAX_ERROR;
1079                 }
1080
1081                 switch (tmp) {
1082                         case 2:
1083                                 jtag_command_version = JAYLINK_JTAG_VERSION_2;
1084                                 break;
1085                         case 3:
1086                                 jtag_command_version = JAYLINK_JTAG_VERSION_3;
1087                                 break;
1088                         default:
1089                                 command_print(CMD, "Invalid argument: %s.", CMD_ARGV[0]);
1090                                 return ERROR_COMMAND_SYNTAX_ERROR;
1091                 }
1092         } else {
1093                 command_print(CMD, "Need exactly one argument for jlink jtag.");
1094                 return ERROR_COMMAND_SYNTAX_ERROR;
1095         }
1096
1097         return ERROR_OK;
1098 }
1099
1100 COMMAND_HANDLER(jlink_handle_target_power_command)
1101 {
1102         int ret;
1103         int enable;
1104
1105         if (CMD_ARGC != 1) {
1106                 command_print(CMD, "Need exactly one argument for jlink "
1107                         "targetpower.");
1108                 return ERROR_COMMAND_SYNTAX_ERROR;
1109         }
1110
1111         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_SET_TARGET_POWER)) {
1112                 command_print(CMD, "Target power supply is not supported by the "
1113                         "device.");
1114                 return ERROR_OK;
1115         }
1116
1117         if (!strcmp(CMD_ARGV[0], "on")) {
1118                 enable = true;
1119         } else if (!strcmp(CMD_ARGV[0], "off")) {
1120                 enable = false;
1121         } else {
1122                 command_print(CMD, "Invalid argument: %s.", CMD_ARGV[0]);
1123                 return ERROR_FAIL;
1124         }
1125
1126         ret = jaylink_set_target_power(devh, enable);
1127
1128         if (ret != JAYLINK_OK) {
1129                 command_print(CMD, "jaylink_set_target_power() failed: %s.",
1130                         jaylink_strerror(ret));
1131                 return ERROR_FAIL;
1132         }
1133
1134         return ERROR_OK;
1135 }
1136
1137 static void show_config_usb_address(struct command_invocation *cmd)
1138 {
1139         if (config.usb_address != tmp_config.usb_address)
1140                 command_print(cmd, "USB address: %u [%u]", config.usb_address,
1141                         tmp_config.usb_address);
1142         else
1143                 command_print(cmd, "USB address: %u", config.usb_address);
1144 }
1145
1146 static void show_config_ip_address(struct command_invocation *cmd)
1147 {
1148         if (!memcmp(config.ip_address, tmp_config.ip_address, 4))
1149                 command_print(cmd, "IP address: %d.%d.%d.%d",
1150                         config.ip_address[3], config.ip_address[2],
1151                         config.ip_address[1], config.ip_address[0]);
1152         else
1153                 command_print(cmd, "IP address: %d.%d.%d.%d [%d.%d.%d.%d]",
1154                         config.ip_address[3], config.ip_address[2],
1155                         config.ip_address[1], config.ip_address[0],
1156                         tmp_config.ip_address[3], tmp_config.ip_address[2],
1157                         tmp_config.ip_address[1], tmp_config.ip_address[0]);
1158
1159         if (!memcmp(config.subnet_mask, tmp_config.subnet_mask, 4))
1160                 command_print(cmd, "Subnet mask: %d.%d.%d.%d",
1161                         config.subnet_mask[3], config.subnet_mask[2],
1162                         config.subnet_mask[1], config.subnet_mask[0]);
1163         else
1164                 command_print(cmd, "Subnet mask: %d.%d.%d.%d [%d.%d.%d.%d]",
1165                         config.subnet_mask[3], config.subnet_mask[2],
1166                         config.subnet_mask[1], config.subnet_mask[0],
1167                         tmp_config.subnet_mask[3], tmp_config.subnet_mask[2],
1168                         tmp_config.subnet_mask[1], tmp_config.subnet_mask[0]);
1169 }
1170
1171 static void show_config_mac_address(struct command_invocation *cmd)
1172 {
1173         if (!memcmp(config.mac_address, tmp_config.mac_address, 6))
1174                 command_print(cmd, "MAC address: %.02x:%.02x:%.02x:%.02x:%.02x:%.02x",
1175                         config.mac_address[5], config.mac_address[4],
1176                         config.mac_address[3], config.mac_address[2],
1177                         config.mac_address[1], config.mac_address[0]);
1178         else
1179                 command_print(cmd, "MAC address: %.02x:%.02x:%.02x:%.02x:%.02x:%.02x "
1180                         "[%.02x:%.02x:%.02x:%.02x:%.02x:%.02x]",
1181                         config.mac_address[5], config.mac_address[4],
1182                         config.mac_address[3], config.mac_address[2],
1183                         config.mac_address[1], config.mac_address[0],
1184                         tmp_config.mac_address[5], tmp_config.mac_address[4],
1185                         tmp_config.mac_address[3], tmp_config.mac_address[2],
1186                         tmp_config.mac_address[1], tmp_config.mac_address[0]);
1187 }
1188
1189 static void show_config_target_power(struct command_invocation *cmd)
1190 {
1191         const char *target_power;
1192         const char *current_target_power;
1193
1194         if (!config.target_power)
1195                 target_power = "off";
1196         else
1197                 target_power = "on";
1198
1199         if (!tmp_config.target_power)
1200                 current_target_power = "off";
1201         else
1202                 current_target_power = "on";
1203
1204         if (config.target_power != tmp_config.target_power)
1205                 command_print(cmd, "Target power supply: %s [%s]", target_power,
1206                         current_target_power);
1207         else
1208                 command_print(cmd, "Target power supply: %s", target_power);
1209 }
1210
1211 static void show_config(struct command_invocation *cmd)
1212 {
1213         command_print(cmd, "J-Link device configuration:");
1214
1215         show_config_usb_address(cmd);
1216
1217         if (jaylink_has_cap(caps, JAYLINK_DEV_CAP_SET_TARGET_POWER))
1218                 show_config_target_power(cmd);
1219
1220         if (jaylink_has_cap(caps, JAYLINK_DEV_CAP_ETHERNET)) {
1221                 show_config_ip_address(cmd);
1222                 show_config_mac_address(cmd);
1223         }
1224 }
1225
1226 static int poll_trace(uint8_t *buf, size_t *size)
1227 {
1228         int ret;
1229         uint32_t length;
1230
1231         length = *size;
1232
1233         ret = jaylink_swo_read(devh, buf, &length);
1234
1235         if (ret != JAYLINK_OK) {
1236                 LOG_ERROR("jaylink_swo_read() failed: %s.", jaylink_strerror(ret));
1237                 return ERROR_FAIL;
1238         }
1239
1240         *size = length;
1241
1242         return ERROR_OK;
1243 }
1244
1245 static uint32_t calculate_trace_buffer_size(void)
1246 {
1247         int ret;
1248         uint32_t tmp;
1249
1250         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_GET_FREE_MEMORY))
1251                 return 0;
1252
1253         ret = jaylink_get_free_memory(devh, &tmp);
1254
1255         if (ret != JAYLINK_OK) {
1256                 LOG_ERROR("jaylink_get_free_memory() failed: %s.",
1257                         jaylink_strerror(ret));
1258                 return ERROR_FAIL;
1259         }
1260
1261         if (tmp > 0x3fff || tmp <= 0x600)
1262                 tmp = tmp >> 1;
1263         else
1264                 tmp = tmp - 0x400;
1265
1266         return tmp & 0xffffff00;
1267 }
1268
1269 static bool calculate_swo_prescaler(unsigned int traceclkin_freq,
1270                 uint32_t trace_freq, uint16_t *prescaler)
1271 {
1272         unsigned int presc;
1273         presc = DIV_ROUND_UP(traceclkin_freq, trace_freq);
1274         if (presc > TPIU_ACPR_MAX_SWOSCALER)
1275                 return false;
1276
1277         /* Probe's UART speed must be within 3% of the TPIU's SWO baud rate. */
1278         unsigned int max_deviation = (traceclkin_freq * 3) / 100;
1279         if (presc * trace_freq < traceclkin_freq - max_deviation ||
1280             presc * trace_freq > traceclkin_freq + max_deviation)
1281                 return false;
1282
1283         *prescaler = presc;
1284
1285         return true;
1286 }
1287
1288 static bool detect_swo_freq_and_prescaler(struct jaylink_swo_speed speed,
1289                 unsigned int traceclkin_freq, unsigned int *trace_freq,
1290                 uint16_t *prescaler)
1291 {
1292         uint32_t divider;
1293         unsigned int presc;
1294         double deviation;
1295
1296         for (divider = speed.min_div; divider <= speed.max_div; divider++) {
1297                 *trace_freq = speed.freq / divider;
1298                 presc = ((1.0 - SWO_MAX_FREQ_DEV) * traceclkin_freq) / *trace_freq + 1;
1299
1300                 if (presc > TPIU_ACPR_MAX_SWOSCALER)
1301                         break;
1302
1303                 deviation = fabs(1.0 - ((double)*trace_freq * presc / traceclkin_freq));
1304
1305                 if (deviation <= SWO_MAX_FREQ_DEV) {
1306                         *prescaler = presc;
1307                         return true;
1308                 }
1309         }
1310
1311         return false;
1312 }
1313
1314 static int config_trace(bool enabled, enum tpiu_pin_protocol pin_protocol,
1315                 uint32_t port_size, unsigned int *trace_freq,
1316                 unsigned int traceclkin_freq, uint16_t *prescaler)
1317 {
1318         int ret;
1319         uint32_t buffer_size;
1320         struct jaylink_swo_speed speed;
1321         uint32_t divider;
1322         uint32_t min_freq;
1323         uint32_t max_freq;
1324
1325         trace_enabled = enabled;
1326
1327         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_SWO)) {
1328                 if (!enabled)
1329                         return ERROR_OK;
1330
1331                 LOG_ERROR("Trace capturing is not supported by the device.");
1332                 return ERROR_FAIL;
1333         }
1334
1335         ret = jaylink_swo_stop(devh);
1336
1337         if (ret != JAYLINK_OK) {
1338                 LOG_ERROR("jaylink_swo_stop() failed: %s.", jaylink_strerror(ret));
1339                 return ERROR_FAIL;
1340         }
1341
1342         if (!enabled) {
1343                 /*
1344                  * Adjust the SWD transaction buffer size as stopping SWO capturing
1345                  * deallocates device internal memory.
1346                  */
1347                 if (!adjust_swd_buffer_size())
1348                         return ERROR_FAIL;
1349
1350                 return ERROR_OK;
1351         }
1352
1353         if (pin_protocol != TPIU_PIN_PROTOCOL_ASYNC_UART) {
1354                 LOG_ERROR("Selected pin protocol is not supported.");
1355                 return ERROR_FAIL;
1356         }
1357
1358         buffer_size = calculate_trace_buffer_size();
1359
1360         if (!buffer_size) {
1361                 LOG_ERROR("Not enough free device memory to start trace capturing.");
1362                 return ERROR_FAIL;
1363         }
1364
1365         ret = jaylink_swo_get_speeds(devh, JAYLINK_SWO_MODE_UART, &speed);
1366
1367         if (ret != JAYLINK_OK) {
1368                 LOG_ERROR("jaylink_swo_get_speeds() failed: %s.",
1369                         jaylink_strerror(ret));
1370                 return ERROR_FAIL;
1371         }
1372
1373         if (*trace_freq > 0) {
1374                 divider = speed.freq / *trace_freq;
1375                 min_freq = speed.freq / speed.max_div;
1376                 max_freq = speed.freq / speed.min_div;
1377
1378                 if (*trace_freq > max_freq) {
1379                         LOG_INFO("Given SWO frequency too high, using %" PRIu32 " Hz instead.",
1380                                 max_freq);
1381                         *trace_freq = max_freq;
1382                 } else if (*trace_freq < min_freq) {
1383                         LOG_INFO("Given SWO frequency too low, using %" PRIu32 " Hz instead.",
1384                                 min_freq);
1385                         *trace_freq = min_freq;
1386                 } else if (*trace_freq != speed.freq / divider) {
1387                         *trace_freq = speed.freq / divider;
1388
1389                         LOG_INFO("Given SWO frequency is not supported by the device, "
1390                                 "using %u Hz instead.", *trace_freq);
1391                 }
1392
1393                 if (!calculate_swo_prescaler(traceclkin_freq, *trace_freq,
1394                                 prescaler)) {
1395                         LOG_ERROR("SWO frequency is not suitable. Please choose a "
1396                                 "different frequency or use auto-detection.");
1397                         return ERROR_FAIL;
1398                 }
1399         } else {
1400                 LOG_INFO("Trying to auto-detect SWO frequency.");
1401
1402                 if (!detect_swo_freq_and_prescaler(speed, traceclkin_freq, trace_freq,
1403                                 prescaler)) {
1404                         LOG_ERROR("Maximum permitted frequency deviation of %.02f %% "
1405                                 "could not be achieved.", SWO_MAX_FREQ_DEV);
1406                         LOG_ERROR("Auto-detection of SWO frequency failed.");
1407                         return ERROR_FAIL;
1408                 }
1409
1410                 LOG_INFO("Using SWO frequency of %u Hz.", *trace_freq);
1411         }
1412
1413         ret = jaylink_swo_start(devh, JAYLINK_SWO_MODE_UART, *trace_freq,
1414                 buffer_size);
1415
1416         if (ret != JAYLINK_OK) {
1417                 LOG_ERROR("jaylink_start_swo() failed: %s.", jaylink_strerror(ret));
1418                 return ERROR_FAIL;
1419         }
1420
1421         LOG_DEBUG("Using %" PRIu32 " bytes device memory for trace capturing.",
1422                 buffer_size);
1423
1424         /*
1425          * Adjust the SWD transaction buffer size as starting SWO capturing
1426          * allocates device internal memory.
1427          */
1428         if (!adjust_swd_buffer_size())
1429                 return ERROR_FAIL;
1430
1431         return ERROR_OK;
1432 }
1433
1434 COMMAND_HANDLER(jlink_handle_config_usb_address_command)
1435 {
1436         uint8_t tmp;
1437
1438         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_READ_CONFIG)) {
1439                 command_print(CMD, "Reading configuration is not supported by the "
1440                         "device.");
1441                 return ERROR_OK;
1442         }
1443
1444         if (!CMD_ARGC) {
1445                 show_config_usb_address(CMD);
1446         } else if (CMD_ARGC == 1) {
1447                 if (sscanf(CMD_ARGV[0], "%" SCNd8, &tmp) != 1) {
1448                         command_print(CMD, "Invalid USB address: %s.", CMD_ARGV[0]);
1449                         return ERROR_FAIL;
1450                 }
1451
1452                 if (tmp > JAYLINK_USB_ADDRESS_3) {
1453                         command_print(CMD, "Invalid USB address: %u.", tmp);
1454                         return ERROR_FAIL;
1455                 }
1456
1457                 tmp_config.usb_address = tmp;
1458         } else {
1459                 command_print(CMD, "Need exactly one argument for jlink config "
1460                         "usb.");
1461                 return ERROR_COMMAND_SYNTAX_ERROR;
1462         }
1463
1464         return ERROR_OK;
1465 }
1466
1467 COMMAND_HANDLER(jlink_handle_config_target_power_command)
1468 {
1469         int enable;
1470
1471         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_READ_CONFIG)) {
1472                 command_print(CMD, "Reading configuration is not supported by the "
1473                         "device.");
1474                 return ERROR_OK;
1475         }
1476
1477         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_SET_TARGET_POWER)) {
1478                 command_print(CMD, "Target power supply is not supported by the "
1479                         "device.");
1480                 return ERROR_OK;
1481         }
1482
1483         if (!CMD_ARGC) {
1484                 show_config_target_power(CMD);
1485         } else if (CMD_ARGC == 1) {
1486                 if (!strcmp(CMD_ARGV[0], "on")) {
1487                         enable = true;
1488                 } else if (!strcmp(CMD_ARGV[0], "off")) {
1489                         enable = false;
1490                 } else {
1491                         command_print(CMD, "Invalid argument: %s.", CMD_ARGV[0]);
1492                         return ERROR_FAIL;
1493                 }
1494
1495                 tmp_config.target_power = enable;
1496         } else {
1497                 command_print(CMD, "Need exactly one argument for jlink config "
1498                         "targetpower.");
1499                 return ERROR_COMMAND_SYNTAX_ERROR;
1500         }
1501
1502         return ERROR_OK;
1503 }
1504
1505 COMMAND_HANDLER(jlink_handle_config_mac_address_command)
1506 {
1507         uint8_t addr[6];
1508         int i;
1509         char *e;
1510         const char *str;
1511
1512         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_READ_CONFIG)) {
1513                 command_print(CMD, "Reading configuration is not supported by the "
1514                         "device.");
1515                 return ERROR_OK;
1516         }
1517
1518         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_ETHERNET)) {
1519                 command_print(CMD, "Ethernet connectivity is not supported by the "
1520                         "device.");
1521                 return ERROR_OK;
1522         }
1523
1524         if (!CMD_ARGC) {
1525                 show_config_mac_address(CMD);
1526         } else if (CMD_ARGC == 1) {
1527                 str = CMD_ARGV[0];
1528
1529                 if ((strlen(str) != 17) || (str[2] != ':' || str[5] != ':' ||
1530                                 str[8] != ':' || str[11] != ':' || str[14] != ':')) {
1531                         command_print(CMD, "Invalid MAC address format.");
1532                         return ERROR_COMMAND_SYNTAX_ERROR;
1533                 }
1534
1535                 for (i = 5; i >= 0; i--) {
1536                         addr[i] = strtoul(str, &e, 16);
1537                         str = e + 1;
1538                 }
1539
1540                 if (!(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5])) {
1541                         command_print(CMD, "Invalid MAC address: zero address.");
1542                         return ERROR_COMMAND_SYNTAX_ERROR;
1543                 }
1544
1545                 if (!(0x01 & addr[0])) {
1546                         command_print(CMD, "Invalid MAC address: multicast address.");
1547                         return ERROR_COMMAND_SYNTAX_ERROR;
1548                 }
1549
1550                 memcpy(tmp_config.mac_address, addr, sizeof(addr));
1551         } else {
1552                 command_print(CMD, "Need exactly one argument for jlink config "
1553                         " mac.");
1554                 return ERROR_COMMAND_SYNTAX_ERROR;
1555         }
1556
1557         return ERROR_OK;
1558 }
1559
1560 static bool string_to_ip(const char *s, uint8_t *ip, int *pos)
1561 {
1562         uint8_t lip[4];
1563         char *e;
1564         const char *s_save = s;
1565         int i;
1566
1567         if (!s)
1568                 return false;
1569
1570         for (i = 0; i < 4; i++) {
1571                 lip[i] = strtoul(s, &e, 10);
1572
1573                 if (*e != '.' && i != 3)
1574                         return false;
1575
1576                 s = e + 1;
1577         }
1578
1579         *pos = e - s_save;
1580         memcpy(ip, lip, sizeof(lip));
1581
1582         return true;
1583 }
1584
1585 static void cpy_ip(uint8_t *dst, uint8_t *src)
1586 {
1587         int i, j;
1588
1589         for (i = 0, j = 3; i < 4; i++, j--)
1590                 dst[i] = src[j];
1591 }
1592
1593 COMMAND_HANDLER(jlink_handle_config_ip_address_command)
1594 {
1595         uint8_t ip_address[4];
1596         uint32_t subnet_mask = 0;
1597         int i, len;
1598         uint8_t subnet_bits = 24;
1599
1600         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_READ_CONFIG)) {
1601                 command_print(CMD, "Reading configuration is not supported by the "
1602                         "device.");
1603                 return ERROR_OK;
1604         }
1605
1606         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_ETHERNET)) {
1607                 command_print(CMD, "Ethernet connectivity is not supported by the "
1608                         "device.");
1609                 return ERROR_OK;
1610         }
1611
1612         if (!CMD_ARGC) {
1613                 show_config_ip_address(CMD);
1614         } else {
1615                 if (!string_to_ip(CMD_ARGV[0], ip_address, &i))
1616                         return ERROR_COMMAND_SYNTAX_ERROR;
1617
1618                 len = strlen(CMD_ARGV[0]);
1619
1620                 /* Check for format A.B.C.D/E. */
1621                 if (i < len) {
1622                         if (CMD_ARGV[0][i] != '/')
1623                                 return ERROR_COMMAND_SYNTAX_ERROR;
1624
1625                         COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0] + i + 1, subnet_bits);
1626                 } else if (CMD_ARGC > 1) {
1627                         if (!string_to_ip(CMD_ARGV[1], (uint8_t *)&subnet_mask, &i))
1628                                 return ERROR_COMMAND_SYNTAX_ERROR;
1629                 }
1630
1631                 if (!subnet_mask)
1632                         subnet_mask = (uint32_t)(subnet_bits < 32 ?
1633                                 ((1ULL << subnet_bits) - 1) : 0xffffffff);
1634
1635                 cpy_ip(tmp_config.ip_address, ip_address);
1636                 cpy_ip(tmp_config.subnet_mask, (uint8_t *)&subnet_mask);
1637         }
1638
1639         return ERROR_OK;
1640 }
1641
1642 COMMAND_HANDLER(jlink_handle_config_reset_command)
1643 {
1644         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_READ_CONFIG))
1645                 return ERROR_OK;
1646
1647         memcpy(&tmp_config, &config, sizeof(struct device_config));
1648
1649         return ERROR_OK;
1650 }
1651
1652
1653 COMMAND_HANDLER(jlink_handle_config_write_command)
1654 {
1655         int ret;
1656
1657         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_READ_CONFIG)) {
1658                 command_print(CMD, "Reading configuration is not supported by the "
1659                         "device.");
1660                 return ERROR_OK;
1661         }
1662
1663         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_WRITE_CONFIG)) {
1664                 command_print(CMD, "Writing configuration is not supported by the "
1665                         "device.");
1666                 return ERROR_OK;
1667         }
1668
1669         if (!memcmp(&config, &tmp_config, sizeof(struct device_config))) {
1670                 command_print(CMD, "Operation not performed due to no changes in "
1671                         "the configuration.");
1672                 return ERROR_OK;
1673         }
1674
1675         ret = jaylink_write_raw_config(devh, (const uint8_t *)&tmp_config);
1676
1677         if (ret != JAYLINK_OK) {
1678                 LOG_ERROR("jaylink_write_raw_config() failed: %s.",
1679                         jaylink_strerror(ret));
1680                 return ERROR_FAIL;
1681         }
1682
1683         if (!read_device_config(&config)) {
1684                 LOG_ERROR("Failed to read device configuration for verification.");
1685                 return ERROR_FAIL;
1686         }
1687
1688         if (memcmp(&config, &tmp_config, sizeof(struct device_config))) {
1689                 LOG_ERROR("Verification of device configuration failed. Please check "
1690                         "your device.");
1691                 return ERROR_FAIL;
1692         }
1693
1694         memcpy(&tmp_config, &config, sizeof(struct device_config));
1695         command_print(CMD, "The new device configuration applies after power "
1696                 "cycling the J-Link device.");
1697
1698         return ERROR_OK;
1699 }
1700
1701 COMMAND_HANDLER(jlink_handle_config_command)
1702 {
1703         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_READ_CONFIG)) {
1704                 command_print(CMD, "Device doesn't support reading configuration.");
1705                 return ERROR_OK;
1706         }
1707
1708         if (CMD_ARGC == 0)
1709                 show_config(CMD);
1710
1711         return ERROR_OK;
1712 }
1713
1714 COMMAND_HANDLER(jlink_handle_emucom_write_command)
1715 {
1716         int ret;
1717         size_t tmp;
1718         uint32_t channel;
1719         uint32_t length;
1720         uint8_t *buf;
1721         size_t dummy;
1722
1723         if (CMD_ARGC != 2)
1724                 return ERROR_COMMAND_SYNTAX_ERROR;
1725
1726         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_EMUCOM)) {
1727                 LOG_ERROR("Device does not support EMUCOM.");
1728                 return ERROR_FAIL;
1729         }
1730
1731         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], channel);
1732
1733         tmp = strlen(CMD_ARGV[1]);
1734
1735         if (tmp % 2 != 0) {
1736                 LOG_ERROR("Data must be encoded as hexadecimal pairs.");
1737                 return ERROR_COMMAND_ARGUMENT_INVALID;
1738         }
1739
1740         buf = malloc(tmp / 2);
1741
1742         if (!buf) {
1743                 LOG_ERROR("Failed to allocate buffer.");
1744                 return ERROR_FAIL;
1745         }
1746
1747         dummy = unhexify(buf, CMD_ARGV[1], tmp / 2);
1748
1749         if (dummy != (tmp / 2)) {
1750                 LOG_ERROR("Data must be encoded as hexadecimal pairs.");
1751                 free(buf);
1752                 return ERROR_COMMAND_ARGUMENT_INVALID;
1753         }
1754
1755         length = tmp / 2;
1756         ret = jaylink_emucom_write(devh, channel, buf, &length);
1757
1758         free(buf);
1759
1760         if (ret == JAYLINK_ERR_DEV_NOT_SUPPORTED) {
1761                 LOG_ERROR("Channel not supported by the device.");
1762                 return ERROR_FAIL;
1763         } else if (ret != JAYLINK_OK) {
1764                 LOG_ERROR("Failed to write to channel: %s.", jaylink_strerror(ret));
1765                 return ERROR_FAIL;
1766         }
1767
1768         if (length != (tmp / 2))
1769                 LOG_WARNING("Only %" PRIu32 " bytes written to the channel.", length);
1770
1771         return ERROR_OK;
1772 }
1773
1774 COMMAND_HANDLER(jlink_handle_emucom_read_command)
1775 {
1776         int ret;
1777         uint32_t channel;
1778         uint32_t length;
1779         uint8_t *buf;
1780         size_t tmp;
1781
1782         if (CMD_ARGC != 2)
1783                 return ERROR_COMMAND_SYNTAX_ERROR;
1784
1785         if (!jaylink_has_cap(caps, JAYLINK_DEV_CAP_EMUCOM)) {
1786                 LOG_ERROR("Device does not support EMUCOM.");
1787                 return ERROR_FAIL;
1788         }
1789
1790         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], channel);
1791         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], length);
1792
1793         buf = malloc(length * 3 + 1);
1794
1795         if (!buf) {
1796                 LOG_ERROR("Failed to allocate buffer.");
1797                 return ERROR_FAIL;
1798         }
1799
1800         ret = jaylink_emucom_read(devh, channel, buf, &length);
1801
1802         if (ret == JAYLINK_ERR_DEV_NOT_SUPPORTED) {
1803                 LOG_ERROR("Channel is not supported by the device.");
1804                 free(buf);
1805                 return ERROR_FAIL;
1806         } else if (ret == JAYLINK_ERR_DEV_NOT_AVAILABLE) {
1807                 LOG_ERROR("Channel is not available for the requested amount of data. "
1808                         "%" PRIu32 " bytes are available.", length);
1809                 free(buf);
1810                 return ERROR_FAIL;
1811         } else if (ret != JAYLINK_OK) {
1812                 LOG_ERROR("Failed to read from channel: %s.", jaylink_strerror(ret));
1813                 free(buf);
1814                 return ERROR_FAIL;
1815         }
1816
1817         tmp = hexify((char *)buf + length, buf, length, 2 * length + 1);
1818
1819         if (tmp != 2 * length) {
1820                 LOG_ERROR("Failed to convert data into hexadecimal string.");
1821                 free(buf);
1822                 return ERROR_FAIL;
1823         }
1824
1825         command_print(CMD, "%s", buf + length);
1826         free(buf);
1827
1828         return ERROR_OK;
1829 }
1830
1831 static const struct command_registration jlink_config_subcommand_handlers[] = {
1832         {
1833                 .name = "usb",
1834                 .handler = &jlink_handle_config_usb_address_command,
1835                 .mode = COMMAND_EXEC,
1836                 .help = "set the USB address",
1837                 .usage = "[0-3]",
1838         },
1839         {
1840                 .name = "targetpower",
1841                 .handler = &jlink_handle_config_target_power_command,
1842                 .mode = COMMAND_EXEC,
1843                 .help = "set the target power supply",
1844                 .usage = "[on|off]"
1845         },
1846         {
1847                 .name = "mac",
1848                 .handler = &jlink_handle_config_mac_address_command,
1849                 .mode = COMMAND_EXEC,
1850                 .help = "set the MAC Address",
1851                 .usage = "[ff:ff:ff:ff:ff:ff]",
1852         },
1853         {
1854                 .name = "ip",
1855                 .handler = &jlink_handle_config_ip_address_command,
1856                 .mode = COMMAND_EXEC,
1857                 .help = "set the IP address, where A.B.C.D is the IP address, "
1858                         "E the bit of the subnet mask, F.G.H.I the subnet mask",
1859                 .usage = "[A.B.C.D[/E] [F.G.H.I]]",
1860         },
1861         {
1862                 .name = "reset",
1863                 .handler = &jlink_handle_config_reset_command,
1864                 .mode = COMMAND_EXEC,
1865                 .help = "undo configuration changes",
1866                 .usage = "",
1867         },
1868         {
1869                 .name = "write",
1870                 .handler = &jlink_handle_config_write_command,
1871                 .mode = COMMAND_EXEC,
1872                 .help = "write configuration to the device",
1873                 .usage = "",
1874         },
1875         COMMAND_REGISTRATION_DONE
1876 };
1877
1878 static const struct command_registration jlink_emucom_subcommand_handlers[] = {
1879         {
1880                 .name = "write",
1881                 .handler = &jlink_handle_emucom_write_command,
1882                 .mode = COMMAND_EXEC,
1883                 .help = "write to a channel",
1884                 .usage = "<channel> <data>",
1885         },
1886         {
1887                 .name = "read",
1888                 .handler = &jlink_handle_emucom_read_command,
1889                 .mode = COMMAND_EXEC,
1890                 .help = "read from a channel",
1891                 .usage = "<channel> <length>"
1892         },
1893         COMMAND_REGISTRATION_DONE
1894 };
1895
1896 static const struct command_registration jlink_subcommand_handlers[] = {
1897         {
1898                 .name = "jtag",
1899                 .handler = &jlink_handle_jlink_jtag_command,
1900                 .mode = COMMAND_EXEC,
1901                 .help = "select the JTAG command version",
1902                 .usage = "[2|3]",
1903         },
1904         {
1905                 .name = "targetpower",
1906                 .handler = &jlink_handle_target_power_command,
1907                 .mode = COMMAND_EXEC,
1908                 .help = "set the target power supply",
1909                 .usage = "<on|off>"
1910         },
1911         {
1912                 .name = "freemem",
1913                 .handler = &jlink_handle_free_memory_command,
1914                 .mode = COMMAND_EXEC,
1915                 .help = "show free device memory",
1916                 .usage = "",
1917         },
1918         {
1919                 .name = "hwstatus",
1920                 .handler = &jlink_handle_hwstatus_command,
1921                 .mode = COMMAND_EXEC,
1922                 .help = "show the hardware status",
1923                 .usage = "",
1924         },
1925         {
1926                 .name = "usb",
1927                 .handler = &jlink_usb_command,
1928                 .mode = COMMAND_CONFIG,
1929                 .help = "set the USB address of the device that should be used",
1930                 .usage = "<0-3>"
1931         },
1932         {
1933                 .name = "serial",
1934                 .handler = &jlink_serial_command,
1935                 .mode = COMMAND_CONFIG,
1936                 .help = "set the serial number of the device that should be used",
1937                 .usage = "<serial number>"
1938         },
1939         {
1940                 .name = "config",
1941                 .handler = &jlink_handle_config_command,
1942                 .mode = COMMAND_EXEC,
1943                 .help = "access the device configuration. If no argument is given "
1944                         "this will show the device configuration",
1945                 .chain = jlink_config_subcommand_handlers,
1946                 .usage = "[<cmd>]",
1947         },
1948         {
1949                 .name = "emucom",
1950                 .mode = COMMAND_EXEC,
1951                 .help = "access EMUCOM channel",
1952                 .chain = jlink_emucom_subcommand_handlers,
1953                 .usage = "",
1954         },
1955         COMMAND_REGISTRATION_DONE
1956 };
1957
1958 static const struct command_registration jlink_command_handlers[] = {
1959         {
1960                 .name = "jlink",
1961                 .mode = COMMAND_ANY,
1962                 .help = "perform jlink management",
1963                 .chain = jlink_subcommand_handlers,
1964                 .usage = "",
1965         },
1966         COMMAND_REGISTRATION_DONE
1967 };
1968
1969 static int jlink_swd_init(void)
1970 {
1971         iface = JAYLINK_TIF_SWD;
1972
1973         return ERROR_OK;
1974 }
1975
1976 static void jlink_swd_write_reg(uint8_t cmd, uint32_t value, uint32_t ap_delay_clk)
1977 {
1978         assert(!(cmd & SWD_CMD_RnW));
1979         jlink_swd_queue_cmd(cmd, NULL, value, ap_delay_clk);
1980 }
1981
1982 static void jlink_swd_read_reg(uint8_t cmd, uint32_t *value, uint32_t ap_delay_clk)
1983 {
1984         assert(cmd & SWD_CMD_RnW);
1985         jlink_swd_queue_cmd(cmd, value, 0, ap_delay_clk);
1986 }
1987
1988 /***************************************************************************/
1989 /* J-Link tap functions */
1990
1991 static unsigned tap_length;
1992 /* In SWD mode use tms buffer for direction control */
1993 static uint8_t tms_buffer[JLINK_TAP_BUFFER_SIZE];
1994 static uint8_t tdi_buffer[JLINK_TAP_BUFFER_SIZE];
1995 static uint8_t tdo_buffer[JLINK_TAP_BUFFER_SIZE];
1996
1997 struct pending_scan_result {
1998         /** First bit position in tdo_buffer to read. */
1999         unsigned first;
2000         /** Number of bits to read. */
2001         unsigned length;
2002         /** Location to store the result */
2003         void *buffer;
2004         /** Offset in the destination buffer */
2005         unsigned buffer_offset;
2006 };
2007
2008 #define MAX_PENDING_SCAN_RESULTS 256
2009
2010 static int pending_scan_results_length;
2011 static struct pending_scan_result pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
2012
2013 static void jlink_tap_init(void)
2014 {
2015         tap_length = 0;
2016         pending_scan_results_length = 0;
2017         memset(tms_buffer, 0, sizeof(tms_buffer));
2018         memset(tdi_buffer, 0, sizeof(tdi_buffer));
2019 }
2020
2021 static void jlink_clock_data(const uint8_t *out, unsigned out_offset,
2022                              const uint8_t *tms_out, unsigned tms_offset,
2023                              uint8_t *in, unsigned in_offset,
2024                              unsigned length)
2025 {
2026         do {
2027                 unsigned available_length = JLINK_TAP_BUFFER_SIZE - tap_length / 8;
2028
2029                 if (!available_length ||
2030                     (in && pending_scan_results_length == MAX_PENDING_SCAN_RESULTS)) {
2031                         if (jlink_flush() != ERROR_OK)
2032                                 return;
2033                         available_length = JLINK_TAP_BUFFER_SIZE;
2034                 }
2035
2036                 struct pending_scan_result *pending_scan_result =
2037                         &pending_scan_results_buffer[pending_scan_results_length];
2038
2039                 unsigned scan_length = length > available_length ?
2040                         available_length : length;
2041
2042                 if (out)
2043                         buf_set_buf(out, out_offset, tdi_buffer, tap_length, scan_length);
2044                 if (tms_out)
2045                         buf_set_buf(tms_out, tms_offset, tms_buffer, tap_length, scan_length);
2046
2047                 if (in) {
2048                         pending_scan_result->first = tap_length;
2049                         pending_scan_result->length = scan_length;
2050                         pending_scan_result->buffer = in;
2051                         pending_scan_result->buffer_offset = in_offset;
2052                         pending_scan_results_length++;
2053                 }
2054
2055                 tap_length += scan_length;
2056                 out_offset += scan_length;
2057                 tms_offset += scan_length;
2058                 in_offset += scan_length;
2059                 length -= scan_length;
2060         } while (length > 0);
2061 }
2062
2063 static int jlink_flush(void)
2064 {
2065         int i;
2066         int ret;
2067
2068         if (!tap_length)
2069                 return ERROR_OK;
2070
2071         jlink_last_state = jtag_debug_state_machine(tms_buffer, tdi_buffer,
2072                 tap_length, jlink_last_state);
2073
2074         ret = jaylink_jtag_io(devh, tms_buffer, tdi_buffer, tdo_buffer,
2075                 tap_length, jtag_command_version);
2076
2077         if (ret != JAYLINK_OK) {
2078                 LOG_ERROR("jaylink_jtag_io() failed: %s.", jaylink_strerror(ret));
2079                 jlink_tap_init();
2080                 return ERROR_JTAG_QUEUE_FAILED;
2081         }
2082
2083         for (i = 0; i < pending_scan_results_length; i++) {
2084                 struct pending_scan_result *p = &pending_scan_results_buffer[i];
2085
2086                 buf_set_buf(tdo_buffer, p->first, p->buffer,
2087                             p->buffer_offset, p->length);
2088
2089                 LOG_DEBUG_IO("Pending scan result, length = %d.", p->length);
2090         }
2091
2092         jlink_tap_init();
2093
2094         return ERROR_OK;
2095 }
2096
2097 static void fill_buffer(uint8_t *buf, uint32_t val, uint32_t len)
2098 {
2099         unsigned int tap_pos = tap_length;
2100
2101         while (len > 32) {
2102                 buf_set_u32(buf, tap_pos, 32, val);
2103                 len -= 32;
2104                 tap_pos += 32;
2105         }
2106
2107         if (len)
2108                 buf_set_u32(buf, tap_pos, len, val);
2109 }
2110
2111 static void jlink_queue_data_out(const uint8_t *data, uint32_t len)
2112 {
2113         const uint32_t dir_out = 0xffffffff;
2114
2115         if (data)
2116                 bit_copy(tdi_buffer, tap_length, data, 0, len);
2117         else
2118                 fill_buffer(tdi_buffer, 0, len);
2119
2120         fill_buffer(tms_buffer, dir_out, len);
2121         tap_length += len;
2122 }
2123
2124 static void jlink_queue_data_in(uint32_t len)
2125 {
2126         const uint32_t dir_in = 0;
2127
2128         fill_buffer(tms_buffer, dir_in, len);
2129         tap_length += len;
2130 }
2131
2132 static int jlink_swd_switch_seq(enum swd_special_seq seq)
2133 {
2134         const uint8_t *s;
2135         unsigned int s_len;
2136
2137         switch (seq) {
2138                 case LINE_RESET:
2139                         LOG_DEBUG("SWD line reset");
2140                         s = swd_seq_line_reset;
2141                         s_len = swd_seq_line_reset_len;
2142                         break;
2143                 case JTAG_TO_SWD:
2144                         LOG_DEBUG("JTAG-to-SWD");
2145                         s = swd_seq_jtag_to_swd;
2146                         s_len = swd_seq_jtag_to_swd_len;
2147                         break;
2148                 case SWD_TO_JTAG:
2149                         LOG_DEBUG("SWD-to-JTAG");
2150                         s = swd_seq_swd_to_jtag;
2151                         s_len = swd_seq_swd_to_jtag_len;
2152                         break;
2153                 default:
2154                         LOG_ERROR("Sequence %d not supported.", seq);
2155                         return ERROR_FAIL;
2156         }
2157
2158         jlink_queue_data_out(s, s_len);
2159
2160         return ERROR_OK;
2161 }
2162
2163 static int jlink_swd_run_queue(void)
2164 {
2165         int i;
2166         int ret;
2167
2168         LOG_DEBUG("Executing %d queued transactions.", pending_scan_results_length);
2169
2170         if (queued_retval != ERROR_OK) {
2171                 LOG_DEBUG("Skipping due to previous errors: %d.", queued_retval);
2172                 goto skip;
2173         }
2174
2175         /*
2176          * A transaction must be followed by another transaction or at least 8 idle
2177          * cycles to ensure that data is clocked through the AP.
2178          */
2179         jlink_queue_data_out(NULL, 8);
2180
2181         ret = jaylink_swd_io(devh, tms_buffer, tdi_buffer, tdo_buffer, tap_length);
2182
2183         if (ret != JAYLINK_OK) {
2184                 LOG_ERROR("jaylink_swd_io() failed: %s.", jaylink_strerror(ret));
2185                 goto skip;
2186         }
2187
2188         for (i = 0; i < pending_scan_results_length; i++) {
2189                 int ack = buf_get_u32(tdo_buffer, pending_scan_results_buffer[i].first, 3);
2190
2191                 if (ack != SWD_ACK_OK) {
2192                         LOG_DEBUG("SWD ack not OK: %d %s", ack,
2193                                   ack == SWD_ACK_WAIT ? "WAIT" : ack == SWD_ACK_FAULT ? "FAULT" : "JUNK");
2194                         queued_retval = ack == SWD_ACK_WAIT ? ERROR_WAIT : ERROR_FAIL;
2195                         goto skip;
2196                 } else if (pending_scan_results_buffer[i].length) {
2197                         uint32_t data = buf_get_u32(tdo_buffer, 3 + pending_scan_results_buffer[i].first, 32);
2198                         int parity = buf_get_u32(tdo_buffer, 3 + 32 + pending_scan_results_buffer[i].first, 1);
2199
2200                         if (parity != parity_u32(data)) {
2201                                 LOG_ERROR("SWD: Read data parity mismatch.");
2202                                 queued_retval = ERROR_FAIL;
2203                                 goto skip;
2204                         }
2205
2206                         if (pending_scan_results_buffer[i].buffer)
2207                                 *(uint32_t *)pending_scan_results_buffer[i].buffer = data;
2208                 }
2209         }
2210
2211 skip:
2212         jlink_tap_init();
2213         ret = queued_retval;
2214         queued_retval = ERROR_OK;
2215
2216         return ret;
2217 }
2218
2219 static void jlink_swd_queue_cmd(uint8_t cmd, uint32_t *dst, uint32_t data, uint32_t ap_delay_clk)
2220 {
2221         uint8_t data_parity_trn[DIV_ROUND_UP(32 + 1, 8)];
2222         if (tap_length + 46 + 8 + ap_delay_clk >= swd_buffer_size * 8 ||
2223             pending_scan_results_length == MAX_PENDING_SCAN_RESULTS) {
2224                 /* Not enough room in the queue. Run the queue. */
2225                 queued_retval = jlink_swd_run_queue();
2226         }
2227
2228         if (queued_retval != ERROR_OK)
2229                 return;
2230
2231         cmd |= SWD_CMD_START | SWD_CMD_PARK;
2232
2233         jlink_queue_data_out(&cmd, 8);
2234
2235         pending_scan_results_buffer[pending_scan_results_length].first = tap_length;
2236
2237         if (cmd & SWD_CMD_RnW) {
2238                 /* Queue a read transaction. */
2239                 pending_scan_results_buffer[pending_scan_results_length].length = 32;
2240                 pending_scan_results_buffer[pending_scan_results_length].buffer = dst;
2241
2242                 jlink_queue_data_in(1 + 3 + 32 + 1 + 1);
2243         } else {
2244                 /* Queue a write transaction. */
2245                 pending_scan_results_buffer[pending_scan_results_length].length = 0;
2246                 jlink_queue_data_in(1 + 3 + 1);
2247
2248                 buf_set_u32(data_parity_trn, 0, 32, data);
2249                 buf_set_u32(data_parity_trn, 32, 1, parity_u32(data));
2250
2251                 jlink_queue_data_out(data_parity_trn, 32 + 1);
2252         }
2253
2254         pending_scan_results_length++;
2255
2256         /* Insert idle cycles after AP accesses to avoid WAIT. */
2257         if (cmd & SWD_CMD_APnDP)
2258                 jlink_queue_data_out(NULL, ap_delay_clk);
2259 }
2260
2261 static const struct swd_driver jlink_swd = {
2262         .init = &jlink_swd_init,
2263         .switch_seq = &jlink_swd_switch_seq,
2264         .read_reg = &jlink_swd_read_reg,
2265         .write_reg = &jlink_swd_write_reg,
2266         .run = &jlink_swd_run_queue,
2267 };
2268
2269 static const char * const jlink_transports[] = { "jtag", "swd", NULL };
2270
2271 static struct jtag_interface jlink_interface = {
2272         .execute_queue = &jlink_execute_queue,
2273 };
2274
2275 struct adapter_driver jlink_adapter_driver = {
2276         .name = "jlink",
2277         .transports = jlink_transports,
2278         .commands = jlink_command_handlers,
2279
2280         .init = &jlink_init,
2281         .quit = &jlink_quit,
2282         .reset = &jlink_reset_safe,
2283         .speed = &jlink_speed,
2284         .khz = &jlink_khz,
2285         .speed_div = &jlink_speed_div,
2286         .config_trace = &config_trace,
2287         .poll_trace = &poll_trace,
2288
2289         .jtag_ops = &jlink_interface,
2290         .swd_ops = &jlink_swd,
2291 };