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   1 /*
   2  * JTAG to VPI driver
   3  *
   4  * Copyright (C) 2013 Franck Jullien, <elec4fun@gmail.com>
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <jtag/interface.h>
  28 #ifdef HAVE_ARPA_INET_H
  29 #include <arpa/inet.h>
  30 #endif
  31
  32 #ifndef _WIN32
  33 #include <netinet/tcp.h>
  34 #endif
  35
  36 #define NO_TAP_SHIFT    0
  37 #define TAP_SHIFT       1
  38
  39 #define SERVER_ADDRESS  "127.0.0.1"
  40 #define SERVER_PORT     5555
  41
  42 #define XFERT_MAX_SIZE          512
  43
  44 #define CMD_RESET               0
  45 #define CMD_TMS_SEQ             1
  46 #define CMD_SCAN_CHAIN          2
  47 #define CMD_SCAN_CHAIN_FLIP_TMS 3
  48 #define CMD_STOP_SIMU           4
  49
  50 int server_port = SERVER_PORT;
  51 char *server_address;
  52
  53 int sockfd;
  54 struct sockaddr_in serv_addr;
  55
  56 /* One jtag_vpi "packet" as sent over a TCP channel. */
  57 struct vpi_cmd {
  58         union {
  59                 uint32_t cmd;
  60                 unsigned char cmd_buf[4];
  61         };
  62         unsigned char buffer_out[XFERT_MAX_SIZE];
  63         unsigned char buffer_in[XFERT_MAX_SIZE];
  64         union {
  65                 uint32_t length;
  66                 unsigned char length_buf[4];
  67         };
  68         union {
  69                 uint32_t nb_bits;
  70                 unsigned char nb_bits_buf[4];
  71         };
  72 };
  73
  74 static int jtag_vpi_send_cmd(struct vpi_cmd *vpi)
  75 {
  76         /* Use little endian when transmitting/receiving jtag_vpi cmds.
  77            The choice of little endian goes against usual networking conventions
  78            but is intentional to remain compatible with most older OpenOCD builds
  79            (i.e. builds on little-endian platforms). */
  80         h_u32_to_le(vpi->cmd_buf, vpi->cmd);
  81         h_u32_to_le(vpi->length_buf, vpi->length);
  82         h_u32_to_le(vpi->nb_bits_buf, vpi->nb_bits);
  83
  84         int retval = write_socket(sockfd, vpi, sizeof(struct vpi_cmd));
  85         if (retval <= 0)
  86                 return ERROR_FAIL;
  87
  88         return ERROR_OK;
  89 }
  90
  91 static int jtag_vpi_receive_cmd(struct vpi_cmd *vpi)
  92 {
  93         int retval = read_socket(sockfd, vpi, sizeof(struct vpi_cmd));
  94         if (retval < (int)sizeof(struct vpi_cmd))
  95                 return ERROR_FAIL;
  96
  97         /* Use little endian when transmitting/receiving jtag_vpi cmds. */
  98         vpi->cmd = le_to_h_u32(vpi->cmd_buf);
  99         vpi->length = le_to_h_u32(vpi->length_buf);
 100         vpi->nb_bits = le_to_h_u32(vpi->nb_bits_buf);
 101
 102         return ERROR_OK;
 103 }
 104
 105 /**
 106  * jtag_vpi_reset - ask to reset the JTAG device
 107  * @trst: 1 if TRST is to be asserted
 108  * @srst: 1 if SRST is to be asserted
 109  */
 110 static int jtag_vpi_reset(int trst, int srst)
 111 {
 112         struct vpi_cmd vpi;
 113
 114         vpi.cmd = CMD_RESET;
 115         vpi.length = 0;
 116         return jtag_vpi_send_cmd(&vpi);
 117 }
 118
 119 /**
 120  * jtag_vpi_tms_seq - ask a TMS sequence transition to JTAG
 121  * @bits: TMS bits to be written (bit0, bit1 .. bitN)
 122  * @nb_bits: number of TMS bits (between 1 and 8)
 123  *
 124  * Write a serie of TMS transitions, where each transition consists in :
 125  *  - writing out TCK=0, TMS=<new_state>, TDI=<???>
 126  *  - writing out TCK=1, TMS=<new_state>, TDI=<???> which triggers the transition
 127  * The function ensures that at the end of the sequence, the clock (TCK) is put
 128  * low.
 129  */
 130 static int jtag_vpi_tms_seq(const uint8_t *bits, int nb_bits)
 131 {
 132         struct vpi_cmd vpi;
 133         int nb_bytes;
 134
 135         nb_bytes = DIV_ROUND_UP(nb_bits, 8);
 136
 137         vpi.cmd = CMD_TMS_SEQ;
 138         memcpy(vpi.buffer_out, bits, nb_bytes);
 139         vpi.length = nb_bytes;
 140         vpi.nb_bits = nb_bits;
 141
 142         return jtag_vpi_send_cmd(&vpi);
 143 }
 144
 145 /**
 146  * jtag_vpi_path_move - ask a TMS sequence transition to JTAG
 147  * @cmd: path transition
 148  *
 149  * Write a serie of TMS transitions, where each transition consists in :
 150  *  - writing out TCK=0, TMS=<new_state>, TDI=<???>
 151  *  - writing out TCK=1, TMS=<new_state>, TDI=<???> which triggers the transition
 152  * The function ensures that at the end of the sequence, the clock (TCK) is put
 153  * low.
 154  */
 155
 156 static int jtag_vpi_path_move(struct pathmove_command *cmd)
 157 {
 158         uint8_t trans[DIV_ROUND_UP(cmd->num_states, 8)];
 159
 160         memset(trans, 0, DIV_ROUND_UP(cmd->num_states, 8));
 161
 162         for (int i = 0; i < cmd->num_states; i++) {
 163                 if (tap_state_transition(tap_get_state(), true) == cmd->path[i])
 164                         buf_set_u32(trans, i, 1, 1);
 165                 tap_set_state(cmd->path[i]);
 166         }
 167
 168         return jtag_vpi_tms_seq(trans, cmd->num_states);
 169 }
 170
 171 /**
 172  * jtag_vpi_tms - ask a tms command
 173  * @cmd: tms command
 174  */
 175 static int jtag_vpi_tms(struct tms_command *cmd)
 176 {
 177         return jtag_vpi_tms_seq(cmd->bits, cmd->num_bits);
 178 }
 179
 180 static int jtag_vpi_state_move(tap_state_t state)
 181 {
 182         if (tap_get_state() == state)
 183                 return ERROR_OK;
 184
 185         uint8_t tms_scan = tap_get_tms_path(tap_get_state(), state);
 186         int tms_len = tap_get_tms_path_len(tap_get_state(), state);
 187
 188         int retval = jtag_vpi_tms_seq(&tms_scan, tms_len);
 189         if (retval != ERROR_OK)
 190                 return retval;
 191
 192         tap_set_state(state);
 193
 194         return ERROR_OK;
 195 }
 196
 197 static int jtag_vpi_queue_tdi_xfer(uint8_t *bits, int nb_bits, int tap_shift)
 198 {
 199         struct vpi_cmd vpi;
 200         int nb_bytes = DIV_ROUND_UP(nb_bits, 8);
 201
 202         vpi.cmd = tap_shift ? CMD_SCAN_CHAIN_FLIP_TMS : CMD_SCAN_CHAIN;
 203
 204         if (bits)
 205                 memcpy(vpi.buffer_out, bits, nb_bytes);
 206         else
 207                 memset(vpi.buffer_out, 0xff, nb_bytes);
 208
 209         vpi.length = nb_bytes;
 210         vpi.nb_bits = nb_bits;
 211
 212         int retval = jtag_vpi_send_cmd(&vpi);
 213         if (retval != ERROR_OK)
 214                 return retval;
 215
 216         retval = jtag_vpi_receive_cmd(&vpi);
 217         if (retval != ERROR_OK)
 218                 return retval;
 219
 220         if (bits)
 221                 memcpy(bits, vpi.buffer_in, nb_bytes);
 222
 223         return ERROR_OK;
 224 }
 225
 226 /**
 227  * jtag_vpi_queue_tdi - short description
 228  * @bits: bits to be queued on TDI (or NULL if 0 are to be queued)
 229  * @nb_bits: number of bits
 230  */
 231 static int jtag_vpi_queue_tdi(uint8_t *bits, int nb_bits, int tap_shift)
 232 {
 233         int nb_xfer = DIV_ROUND_UP(nb_bits, XFERT_MAX_SIZE * 8);
 234         int retval;
 235
 236         while (nb_xfer) {
 237                 if (nb_xfer ==  1) {
 238                         retval = jtag_vpi_queue_tdi_xfer(bits, nb_bits, tap_shift);
 239                         if (retval != ERROR_OK)
 240                                 return retval;
 241                 } else {
 242                         retval = jtag_vpi_queue_tdi_xfer(bits, XFERT_MAX_SIZE * 8, NO_TAP_SHIFT);
 243                         if (retval != ERROR_OK)
 244                                 return retval;
 245                         nb_bits -= XFERT_MAX_SIZE * 8;
 246                         if (bits)
 247                                 bits += XFERT_MAX_SIZE;
 248                 }
 249
 250                 nb_xfer--;
 251         }
 252
 253         return ERROR_OK;
 254 }
 255
 256 /**
 257  * jtag_vpi_clock_tms - clock a TMS transition
 258  * @tms: the TMS to be sent
 259  *
 260  * Triggers a TMS transition (ie. one JTAG TAP state move).
 261  */
 262 static int jtag_vpi_clock_tms(int tms)
 263 {
 264         const uint8_t tms_0 = 0;
 265         const uint8_t tms_1 = 1;
 266
 267         return jtag_vpi_tms_seq(tms ? &tms_1 : &tms_0, 1);
 268 }
 269
 270 /**
 271  * jtag_vpi_scan - launches a DR-scan or IR-scan
 272  * @cmd: the command to launch
 273  *
 274  * Launch a JTAG IR-scan or DR-scan
 275  *
 276  * Returns ERROR_OK if OK, ERROR_xxx if a read/write error occured.
 277  */
 278 static int jtag_vpi_scan(struct scan_command *cmd)
 279 {
 280         int scan_bits;
 281         uint8_t *buf = NULL;
 282         int retval = ERROR_OK;
 283
 284         scan_bits = jtag_build_buffer(cmd, &buf);
 285
 286         if (cmd->ir_scan) {
 287                 retval = jtag_vpi_state_move(TAP_IRSHIFT);
 288                 if (retval != ERROR_OK)
 289                         return retval;
 290         } else {
 291                 retval = jtag_vpi_state_move(TAP_DRSHIFT);
 292                 if (retval != ERROR_OK)
 293                         return retval;
 294         }
 295
 296         if (cmd->end_state == TAP_DRSHIFT) {
 297                 retval = jtag_vpi_queue_tdi(buf, scan_bits, NO_TAP_SHIFT);
 298                 if (retval != ERROR_OK)
 299                         return retval;
 300         } else {
 301                 retval = jtag_vpi_queue_tdi(buf, scan_bits, TAP_SHIFT);
 302                 if (retval != ERROR_OK)
 303                         return retval;
 304         }
 305
 306         if (cmd->end_state != TAP_DRSHIFT) {
 307                 /*
 308                  * As our JTAG is in an unstable state (IREXIT1 or DREXIT1), move it
 309                  * forward to a stable IRPAUSE or DRPAUSE.
 310                  */
 311                 retval = jtag_vpi_clock_tms(0);
 312                 if (retval != ERROR_OK)
 313                         return retval;
 314
 315                 if (cmd->ir_scan)
 316                         tap_set_state(TAP_IRPAUSE);
 317                 else
 318                         tap_set_state(TAP_DRPAUSE);
 319         }
 320
 321         retval = jtag_read_buffer(buf, cmd);
 322         if (retval != ERROR_OK)
 323                 return retval;
 324
 325         if (buf)
 326                 free(buf);
 327
 328         if (cmd->end_state != TAP_DRSHIFT) {
 329                 retval = jtag_vpi_state_move(cmd->end_state);
 330                 if (retval != ERROR_OK)
 331                         return retval;
 332         }
 333
 334         return ERROR_OK;
 335 }
 336
 337 static int jtag_vpi_runtest(int cycles, tap_state_t state)
 338 {
 339         int retval;
 340
 341         retval = jtag_vpi_state_move(TAP_IDLE);
 342         if (retval != ERROR_OK)
 343                 return retval;
 344
 345         retval = jtag_vpi_queue_tdi(NULL, cycles, NO_TAP_SHIFT);
 346         if (retval != ERROR_OK)
 347                 return retval;
 348
 349         return jtag_vpi_state_move(state);
 350 }
 351
 352 static int jtag_vpi_stableclocks(int cycles)
 353 {
 354         uint8_t tms_bits[4];
 355         int cycles_remain = cycles;
 356         int nb_bits;
 357         int retval;
 358         const int CYCLES_ONE_BATCH = sizeof(tms_bits) * 8;
 359
 360         assert(cycles >= 0);
 361
 362         /* use TMS=1 in TAP RESET state, TMS=0 in all other stable states */
 363         memset(&tms_bits, (tap_get_state() == TAP_RESET) ? 0xff : 0x00, sizeof(tms_bits));
 364
 365         /* send the TMS bits */
 366         while (cycles_remain > 0) {
 367                 nb_bits = (cycles_remain < CYCLES_ONE_BATCH) ? cycles_remain : CYCLES_ONE_BATCH;
 368                 retval = jtag_vpi_tms_seq(tms_bits, nb_bits);
 369                 if (retval != ERROR_OK)
 370                         return retval;
 371                 cycles_remain -= nb_bits;
 372         }
 373
 374         return ERROR_OK;
 375 }
 376
 377 static int jtag_vpi_execute_queue(void)
 378 {
 379         struct jtag_command *cmd;
 380         int retval = ERROR_OK;
 381
 382         for (cmd = jtag_command_queue; retval == ERROR_OK && cmd != NULL;
 383              cmd = cmd->next) {
 384                 switch (cmd->type) {
 385                 case JTAG_RESET:
 386                         retval = jtag_vpi_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 387                         break;
 388                 case JTAG_RUNTEST:
 389                         retval = jtag_vpi_runtest(cmd->cmd.runtest->num_cycles,
 390                                                   cmd->cmd.runtest->end_state);
 391                         break;
 392                 case JTAG_STABLECLOCKS:
 393                         retval = jtag_vpi_stableclocks(cmd->cmd.stableclocks->num_cycles);
 394                         break;
 395                 case JTAG_TLR_RESET:
 396                         retval = jtag_vpi_state_move(cmd->cmd.statemove->end_state);
 397                         break;
 398                 case JTAG_PATHMOVE:
 399                         retval = jtag_vpi_path_move(cmd->cmd.pathmove);
 400                         break;
 401                 case JTAG_TMS:
 402                         retval = jtag_vpi_tms(cmd->cmd.tms);
 403                         break;
 404                 case JTAG_SLEEP:
 405                         jtag_sleep(cmd->cmd.sleep->us);
 406                         break;
 407                 case JTAG_SCAN:
 408                         retval = jtag_vpi_scan(cmd->cmd.scan);
 409                         break;
 410                 default:
 411                         LOG_ERROR("BUG: unknown JTAG command type 0x%X",
 412                                   cmd->type);
 413                         retval = ERROR_FAIL;
 414                         break;
 415                 }
 416         }
 417
 418         return retval;
 419 }
 420
 421 static int jtag_vpi_init(void)
 422 {
 423         int flag = 1;
 424
 425         sockfd = socket(AF_INET, SOCK_STREAM, 0);
 426         if (sockfd < 0) {
 427                 LOG_ERROR("Could not create socket");
 428                 return ERROR_FAIL;
 429         }
 430
 431         memset(&serv_addr, 0, sizeof(serv_addr));
 432
 433         serv_addr.sin_family = AF_INET;
 434         serv_addr.sin_port = htons(server_port);
 435
 436         if (!server_address)
 437                 server_address = strdup(SERVER_ADDRESS);
 438
 439         serv_addr.sin_addr.s_addr = inet_addr(server_address);
 440
 441         if (serv_addr.sin_addr.s_addr == INADDR_NONE) {
 442                 LOG_ERROR("inet_addr error occured");
 443                 return ERROR_FAIL;
 444         }
 445
 446         if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
 447                 close(sockfd);
 448                 LOG_ERROR("Can't connect to %s : %u", server_address, server_port);
 449                 return ERROR_COMMAND_CLOSE_CONNECTION;
 450         }
 451
 452         if (serv_addr.sin_addr.s_addr == htonl(INADDR_LOOPBACK)) {
 453                 /* This increases performance drematically for local
 454                  * connections, which is the most likely arrangement
 455                  * for a VPI connection. */
 456                 setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, (char *)&flag, sizeof(int));
 457         }
 458
 459         LOG_INFO("Connection to %s : %u succeed", server_address, server_port);
 460
 461         return ERROR_OK;
 462 }
 463
 464 static int jtag_vpi_quit(void)
 465 {
 466         free(server_address);
 467         return close(sockfd);
 468 }
 469
 470 COMMAND_HANDLER(jtag_vpi_set_port)
 471 {
 472         if (CMD_ARGC == 0)
 473                 LOG_WARNING("You need to set a port number");
 474         else
 475                 COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], server_port);
 476
 477         LOG_INFO("Set server port to %u", server_port);
 478
 479         return ERROR_OK;
 480 }
 481
 482 COMMAND_HANDLER(jtag_vpi_set_address)
 483 {
 484         free(server_address);
 485
 486         if (CMD_ARGC == 0) {
 487                 LOG_WARNING("You need to set an address");
 488                 server_address = strdup(SERVER_ADDRESS);
 489         } else
 490                 server_address = strdup(CMD_ARGV[0]);
 491
 492         LOG_INFO("Set server address to %s", server_address);
 493
 494         return ERROR_OK;
 495 }
 496
 497 static const struct command_registration jtag_vpi_command_handlers[] = {
 498         {
 499                 .name = "jtag_vpi_set_port",
 500                 .handler = &jtag_vpi_set_port,
 501                 .mode = COMMAND_CONFIG,
 502                 .help = "set the port of the VPI server",
 503                 .usage = "description_string",
 504         },
 505         {
 506                 .name = "jtag_vpi_set_address",
 507                 .handler = &jtag_vpi_set_address,
 508                 .mode = COMMAND_CONFIG,
 509                 .help = "set the address of the VPI server",
 510                 .usage = "description_string",
 511         },
 512         COMMAND_REGISTRATION_DONE
 513 };
 514
 515 struct jtag_interface jtag_vpi_interface = {
 516         .name = "jtag_vpi",
 517         .supported = DEBUG_CAP_TMS_SEQ,
 518         .commands = jtag_vpi_command_handlers,
 519         .transports = jtag_only,
 520
 521         .init = jtag_vpi_init,
 522         .quit = jtag_vpi_quit,
 523         .execute_queue = jtag_vpi_execute_queue,
 524 };