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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  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <jtag/interface.h>
  26 #ifdef HAVE_ARPA_INET_H
  27 #include <arpa/inet.h>
  28 #endif
  29
  30 #define NO_TAP_SHIFT    0
  31 #define TAP_SHIFT       1
  32
  33 #define SERVER_ADDRESS  "127.0.0.1"
  34 #define SERVER_PORT     5555
  35
  36 #define XFERT_MAX_SIZE          512
  37
  38 #define CMD_RESET               0
  39 #define CMD_TMS_SEQ             1
  40 #define CMD_SCAN_CHAIN          2
  41 #define CMD_SCAN_CHAIN_FLIP_TMS 3
  42 #define CMD_STOP_SIMU           4
  43
  44 int server_port = SERVER_PORT;
  45 char *server_address;
  46
  47 int sockfd;
  48 struct sockaddr_in serv_addr;
  49
  50 struct vpi_cmd {
  51         int cmd;
  52         unsigned char buffer_out[XFERT_MAX_SIZE];
  53         unsigned char buffer_in[XFERT_MAX_SIZE];
  54         int length;
  55         int nb_bits;
  56 };
  57
  58 static int jtag_vpi_send_cmd(struct vpi_cmd *vpi)
  59 {
  60         int retval = write_socket(sockfd, vpi, sizeof(struct vpi_cmd));
  61         if (retval <= 0)
  62                 return ERROR_FAIL;
  63
  64         return ERROR_OK;
  65 }
  66
  67 static int jtag_vpi_receive_cmd(struct vpi_cmd *vpi)
  68 {
  69         int retval = read_socket(sockfd, vpi, sizeof(struct vpi_cmd));
  70         if (retval < (int)sizeof(struct vpi_cmd))
  71                 return ERROR_FAIL;
  72
  73         return ERROR_OK;
  74 }
  75
  76 /**
  77  * jtag_vpi_reset - ask to reset the JTAG device
  78  * @trst: 1 if TRST is to be asserted
  79  * @srst: 1 if SRST is to be asserted
  80  */
  81 static int jtag_vpi_reset(int trst, int srst)
  82 {
  83         struct vpi_cmd vpi;
  84
  85         vpi.cmd = CMD_RESET;
  86         vpi.length = 0;
  87         return jtag_vpi_send_cmd(&vpi);
  88 }
  89
  90 /**
  91  * jtag_vpi_tms_seq - ask a TMS sequence transition to JTAG
  92  * @bits: TMS bits to be written (bit0, bit1 .. bitN)
  93  * @nb_bits: number of TMS bits (between 1 and 8)
  94  *
  95  * Write a serie of TMS transitions, where each transition consists in :
  96  *  - writing out TCK=0, TMS=<new_state>, TDI=<???>
  97  *  - writing out TCK=1, TMS=<new_state>, TDI=<???> which triggers the transition
  98  * The function ensures that at the end of the sequence, the clock (TCK) is put
  99  * low.
 100  */
 101 static int jtag_vpi_tms_seq(const uint8_t *bits, int nb_bits)
 102 {
 103         struct vpi_cmd vpi;
 104         int nb_bytes;
 105
 106         nb_bytes = DIV_ROUND_UP(nb_bits, 8);
 107
 108         vpi.cmd = CMD_TMS_SEQ;
 109         memcpy(vpi.buffer_out, bits, nb_bytes);
 110         vpi.length = nb_bytes;
 111         vpi.nb_bits = nb_bits;
 112
 113         return jtag_vpi_send_cmd(&vpi);
 114 }
 115
 116 /**
 117  * jtag_vpi_path_move - ask a TMS sequence transition to JTAG
 118  * @cmd: path transition
 119  *
 120  * Write a serie of TMS transitions, where each transition consists in :
 121  *  - writing out TCK=0, TMS=<new_state>, TDI=<???>
 122  *  - writing out TCK=1, TMS=<new_state>, TDI=<???> which triggers the transition
 123  * The function ensures that at the end of the sequence, the clock (TCK) is put
 124  * low.
 125  */
 126
 127 static int jtag_vpi_path_move(struct pathmove_command *cmd)
 128 {
 129         uint8_t trans[DIV_ROUND_UP(cmd->num_states, 8)];
 130
 131         memset(trans, 0, DIV_ROUND_UP(cmd->num_states, 8));
 132
 133         for (int i = 0; i < cmd->num_states; i++) {
 134                 if (tap_state_transition(tap_get_state(), true) == cmd->path[i])
 135                         buf_set_u32(trans, i, 1, 1);
 136                 tap_set_state(cmd->path[i]);
 137         }
 138
 139         return jtag_vpi_tms_seq(trans, cmd->num_states);
 140 }
 141
 142 /**
 143  * jtag_vpi_tms - ask a tms command
 144  * @cmd: tms command
 145  */
 146 static int jtag_vpi_tms(struct tms_command *cmd)
 147 {
 148         return jtag_vpi_tms_seq(cmd->bits, cmd->num_bits);
 149 }
 150
 151 static int jtag_vpi_state_move(tap_state_t state)
 152 {
 153         if (tap_get_state() == state)
 154                 return ERROR_OK;
 155
 156         uint8_t tms_scan = tap_get_tms_path(tap_get_state(), state);
 157         int tms_len = tap_get_tms_path_len(tap_get_state(), state);
 158
 159         int retval = jtag_vpi_tms_seq(&tms_scan, tms_len);
 160         if (retval != ERROR_OK)
 161                 return retval;
 162
 163         tap_set_state(state);
 164
 165         return ERROR_OK;
 166 }
 167
 168 static int jtag_vpi_queue_tdi_xfer(uint8_t *bits, int nb_bits, int tap_shift)
 169 {
 170         struct vpi_cmd vpi;
 171         int nb_bytes = DIV_ROUND_UP(nb_bits, 8);
 172
 173         vpi.cmd = tap_shift ? CMD_SCAN_CHAIN_FLIP_TMS : CMD_SCAN_CHAIN;
 174
 175         if (bits)
 176                 memcpy(vpi.buffer_out, bits, nb_bytes);
 177         else
 178                 memset(vpi.buffer_out, 0xff, nb_bytes);
 179
 180         vpi.length = nb_bytes;
 181         vpi.nb_bits = nb_bits;
 182
 183         int retval = jtag_vpi_send_cmd(&vpi);
 184         if (retval != ERROR_OK)
 185                 return retval;
 186
 187         retval = jtag_vpi_receive_cmd(&vpi);
 188         if (retval != ERROR_OK)
 189                 return retval;
 190
 191         if (bits)
 192                 memcpy(bits, vpi.buffer_in, nb_bytes);
 193
 194         return ERROR_OK;
 195 }
 196
 197 /**
 198  * jtag_vpi_queue_tdi - short description
 199  * @bits: bits to be queued on TDI (or NULL if 0 are to be queued)
 200  * @nb_bits: number of bits
 201  */
 202 static int jtag_vpi_queue_tdi(uint8_t *bits, int nb_bits, int tap_shift)
 203 {
 204         int nb_xfer = DIV_ROUND_UP(nb_bits, XFERT_MAX_SIZE * 8);
 205         uint8_t *xmit_buffer = bits;
 206         int xmit_nb_bits = nb_bits;
 207         int i = 0;
 208         int retval;
 209
 210         while (nb_xfer) {
 211
 212                 if (nb_xfer ==  1) {
 213                         retval = jtag_vpi_queue_tdi_xfer(&xmit_buffer[i], xmit_nb_bits, tap_shift);
 214                         if (retval != ERROR_OK)
 215                                 return retval;
 216                 } else {
 217                         retval = jtag_vpi_queue_tdi_xfer(&xmit_buffer[i], XFERT_MAX_SIZE * 8, NO_TAP_SHIFT);
 218                         if (retval != ERROR_OK)
 219                                 return retval;
 220                         xmit_nb_bits -= XFERT_MAX_SIZE * 8;
 221                         i += XFERT_MAX_SIZE;
 222                 }
 223
 224                 nb_xfer--;
 225         }
 226
 227         return ERROR_OK;
 228 }
 229
 230 /**
 231  * jtag_vpi_clock_tms - clock a TMS transition
 232  * @tms: the TMS to be sent
 233  *
 234  * Triggers a TMS transition (ie. one JTAG TAP state move).
 235  */
 236 static int jtag_vpi_clock_tms(int tms)
 237 {
 238         const uint8_t tms_0 = 0;
 239         const uint8_t tms_1 = 1;
 240
 241         return jtag_vpi_tms_seq(tms ? &tms_1 : &tms_0, 1);
 242 }
 243
 244 /**
 245  * jtag_vpi_scan - launches a DR-scan or IR-scan
 246  * @cmd: the command to launch
 247  *
 248  * Launch a JTAG IR-scan or DR-scan
 249  *
 250  * Returns ERROR_OK if OK, ERROR_xxx if a read/write error occured.
 251  */
 252 static int jtag_vpi_scan(struct scan_command *cmd)
 253 {
 254         int scan_bits;
 255         uint8_t *buf = NULL;
 256         int retval = ERROR_OK;
 257
 258         scan_bits = jtag_build_buffer(cmd, &buf);
 259
 260         if (cmd->ir_scan) {
 261                 retval = jtag_vpi_state_move(TAP_IRSHIFT);
 262                 if (retval != ERROR_OK)
 263                         return retval;
 264         } else {
 265                 retval = jtag_vpi_state_move(TAP_DRSHIFT);
 266                 if (retval != ERROR_OK)
 267                         return retval;
 268         }
 269
 270         if (cmd->end_state == TAP_DRSHIFT) {
 271                 retval = jtag_vpi_queue_tdi(buf, scan_bits, NO_TAP_SHIFT);
 272                 if (retval != ERROR_OK)
 273                         return retval;
 274         } else {
 275                 retval = jtag_vpi_queue_tdi(buf, scan_bits, TAP_SHIFT);
 276                 if (retval != ERROR_OK)
 277                         return retval;
 278         }
 279
 280         if (cmd->end_state != TAP_DRSHIFT) {
 281                 /*
 282                  * As our JTAG is in an unstable state (IREXIT1 or DREXIT1), move it
 283                  * forward to a stable IRPAUSE or DRPAUSE.
 284                  */
 285                 retval = jtag_vpi_clock_tms(0);
 286                 if (retval != ERROR_OK)
 287                         return retval;
 288
 289                 if (cmd->ir_scan)
 290                         tap_set_state(TAP_IRPAUSE);
 291                 else
 292                         tap_set_state(TAP_DRPAUSE);
 293         }
 294
 295         retval = jtag_read_buffer(buf, cmd);
 296         if (retval != ERROR_OK)
 297                 return retval;
 298
 299         if (buf)
 300                 free(buf);
 301
 302         if (cmd->end_state != TAP_DRSHIFT) {
 303                 retval = jtag_vpi_state_move(cmd->end_state);
 304                 if (retval != ERROR_OK)
 305                         return retval;
 306         }
 307
 308         return ERROR_OK;
 309 }
 310
 311 static int jtag_vpi_runtest(int cycles, tap_state_t state)
 312 {
 313         int retval;
 314
 315         retval = jtag_vpi_state_move(TAP_IDLE);
 316         if (retval != ERROR_OK)
 317                 return retval;
 318
 319         retval = jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
 320         if (retval != ERROR_OK)
 321                 return retval;
 322
 323         return jtag_vpi_state_move(state);
 324 }
 325
 326 static int jtag_vpi_stableclocks(int cycles)
 327 {
 328         return jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
 329 }
 330
 331 static int jtag_vpi_execute_queue(void)
 332 {
 333         struct jtag_command *cmd;
 334         int retval = ERROR_OK;
 335
 336         for (cmd = jtag_command_queue; retval == ERROR_OK && cmd != NULL;
 337              cmd = cmd->next) {
 338                 switch (cmd->type) {
 339                 case JTAG_RESET:
 340                         retval = jtag_vpi_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 341                         break;
 342                 case JTAG_RUNTEST:
 343                         retval = jtag_vpi_runtest(cmd->cmd.runtest->num_cycles,
 344                                                   cmd->cmd.runtest->end_state);
 345                         break;
 346                 case JTAG_STABLECLOCKS:
 347                         retval = jtag_vpi_stableclocks(cmd->cmd.stableclocks->num_cycles);
 348                         break;
 349                 case JTAG_TLR_RESET:
 350                         retval = jtag_vpi_state_move(cmd->cmd.statemove->end_state);
 351                         break;
 352                 case JTAG_PATHMOVE:
 353                         retval = jtag_vpi_path_move(cmd->cmd.pathmove);
 354                         break;
 355                 case JTAG_TMS:
 356                         retval = jtag_vpi_tms(cmd->cmd.tms);
 357                         break;
 358                 case JTAG_SLEEP:
 359                         jtag_sleep(cmd->cmd.sleep->us);
 360                         break;
 361                 case JTAG_SCAN:
 362                         retval = jtag_vpi_scan(cmd->cmd.scan);
 363                         break;
 364                 }
 365         }
 366
 367         return retval;
 368 }
 369
 370 static int jtag_vpi_init(void)
 371 {
 372         sockfd = socket(AF_INET, SOCK_STREAM, 0);
 373         if (sockfd < 0) {
 374                 LOG_ERROR("Could not create socket");
 375                 return ERROR_FAIL;
 376         }
 377
 378         memset(&serv_addr, 0, sizeof(serv_addr));
 379
 380         serv_addr.sin_family = AF_INET;
 381         serv_addr.sin_port = htons(server_port);
 382
 383         if (!server_address)
 384                 server_address = strdup(SERVER_ADDRESS);
 385
 386         serv_addr.sin_addr.s_addr = inet_addr(server_address);
 387
 388         if (serv_addr.sin_addr.s_addr == INADDR_NONE) {
 389                 LOG_ERROR("inet_addr error occured");
 390                 return ERROR_FAIL;
 391         }
 392
 393         if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
 394                 close(sockfd);
 395                 LOG_ERROR("Can't connect to %s : %u", server_address, server_port);
 396                 return ERROR_COMMAND_CLOSE_CONNECTION;
 397         }
 398
 399         LOG_INFO("Connection to %s : %u succeed", server_address, server_port);
 400
 401         return ERROR_OK;
 402 }
 403
 404 static int jtag_vpi_quit(void)
 405 {
 406         free(server_address);
 407         return close(sockfd);
 408 }
 409
 410 COMMAND_HANDLER(jtag_vpi_set_port)
 411 {
 412         if (CMD_ARGC == 0)
 413                 LOG_WARNING("You need to set a port number");
 414         else
 415                 COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], server_port);
 416
 417         LOG_INFO("Set server port to %u", server_port);
 418
 419         return ERROR_OK;
 420 }
 421
 422 COMMAND_HANDLER(jtag_vpi_set_address)
 423 {
 424         free(server_address);
 425
 426         if (CMD_ARGC == 0) {
 427                 LOG_WARNING("You need to set an address");
 428                 server_address = strdup(SERVER_ADDRESS);
 429         } else
 430                 server_address = strdup(CMD_ARGV[0]);
 431
 432         LOG_INFO("Set server address to %s", server_address);
 433
 434         return ERROR_OK;
 435 }
 436
 437 static const struct command_registration jtag_vpi_command_handlers[] = {
 438         {
 439                 .name = "jtag_vpi_set_port",
 440                 .handler = &jtag_vpi_set_port,
 441                 .mode = COMMAND_CONFIG,
 442                 .help = "set the port of the VPI server",
 443                 .usage = "description_string",
 444         },
 445         {
 446                 .name = "jtag_vpi_set_address",
 447                 .handler = &jtag_vpi_set_address,
 448                 .mode = COMMAND_CONFIG,
 449                 .help = "set the address of the VPI server",
 450                 .usage = "description_string",
 451         },
 452         COMMAND_REGISTRATION_DONE
 453 };
 454
 455 struct jtag_interface jtag_vpi_interface = {
 456         .name = "jtag_vpi",
 457         .supported = DEBUG_CAP_TMS_SEQ,
 458         .commands = jtag_vpi_command_handlers,
 459         .transports = jtag_only,
 460
 461         .init = jtag_vpi_init,
 462         .quit = jtag_vpi_quit,
 463         .execute_queue = jtag_vpi_execute_queue,
 464 };