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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 #include <arpa/inet.h>
  27
  28 #define NO_TAP_SHIFT    0
  29 #define TAP_SHIFT       1
  30
  31 #define SERVER_ADDRESS  "127.0.0.1"
  32 #define SERVER_PORT     5555
  33
  34 #define XFERT_MAX_SIZE          512
  35
  36 #define CMD_RESET               0
  37 #define CMD_TMS_SEQ             1
  38 #define CMD_SCAN_CHAIN          2
  39 #define CMD_SCAN_CHAIN_FLIP_TMS 3
  40 #define CMD_STOP_SIMU           4
  41
  42 int server_port = SERVER_PORT;
  43
  44 int sockfd;
  45 struct sockaddr_in serv_addr;
  46
  47 struct vpi_cmd {
  48         int cmd;
  49         unsigned char buffer_out[XFERT_MAX_SIZE];
  50         unsigned char buffer_in[XFERT_MAX_SIZE];
  51         int length;
  52         int nb_bits;
  53 };
  54
  55 static int jtag_vpi_send_cmd(struct vpi_cmd *vpi)
  56 {
  57         int retval = write(sockfd, vpi, sizeof(struct vpi_cmd));
  58         if (retval <= 0)
  59                 return ERROR_FAIL;
  60
  61         return ERROR_OK;
  62 }
  63
  64 static int jtag_vpi_receive_cmd(struct vpi_cmd *vpi)
  65 {
  66         int retval = read(sockfd, vpi, sizeof(struct vpi_cmd));
  67         if (retval < (int)sizeof(struct vpi_cmd))
  68                 return ERROR_FAIL;
  69
  70         return ERROR_OK;
  71 }
  72
  73 /**
  74  * jtag_vpi_reset - ask to reset the JTAG device
  75  * @trst: 1 if TRST is to be asserted
  76  * @srst: 1 if SRST is to be asserted
  77  */
  78 static int jtag_vpi_reset(int trst, int srst)
  79 {
  80         struct vpi_cmd vpi;
  81
  82         vpi.cmd = CMD_RESET;
  83         vpi.length = 0;
  84         return jtag_vpi_send_cmd(&vpi);
  85 }
  86
  87 /**
  88  * jtag_vpi_tms_seq - ask a TMS sequence transition to JTAG
  89  * @bits: TMS bits to be written (bit0, bit1 .. bitN)
  90  * @nb_bits: number of TMS bits (between 1 and 8)
  91  *
  92  * Write a serie of TMS transitions, where each transition consists in :
  93  *  - writing out TCK=0, TMS=<new_state>, TDI=<???>
  94  *  - writing out TCK=1, TMS=<new_state>, TDI=<???> which triggers the transition
  95  * The function ensures that at the end of the sequence, the clock (TCK) is put
  96  * low.
  97  */
  98 static int jtag_vpi_tms_seq(const uint8_t *bits, int nb_bits)
  99 {
 100         struct vpi_cmd vpi;
 101         int nb_bytes;
 102
 103         nb_bytes = (nb_bits / 8) + !!(nb_bits % 8);
 104
 105         vpi.cmd = CMD_TMS_SEQ;
 106         memcpy(vpi.buffer_out, bits, nb_bytes);
 107         vpi.length = nb_bytes;
 108         vpi.nb_bits = nb_bits;
 109
 110         return jtag_vpi_send_cmd(&vpi);
 111 }
 112
 113 /**
 114  * jtag_vpi_path_move - ask a TMS sequence transition to JTAG
 115  * @cmd: path transition
 116  *
 117  * Write a serie of TMS transitions, where each transition consists in :
 118  *  - writing out TCK=0, TMS=<new_state>, TDI=<???>
 119  *  - writing out TCK=1, TMS=<new_state>, TDI=<???> which triggers the transition
 120  * The function ensures that at the end of the sequence, the clock (TCK) is put
 121  * low.
 122  */
 123
 124 static int jtag_vpi_path_move(struct pathmove_command *cmd)
 125 {
 126         uint16_t trans = 0;
 127         int retval;
 128         int i;
 129
 130         for (i = 0; i < cmd->num_states; i++) {
 131                 if (tap_state_transition(tap_get_state(), true) == cmd->path[i])
 132                         trans = trans | 1;
 133                 trans = trans << 1;
 134         }
 135
 136         retval = jtag_vpi_tms_seq((uint8_t *)&trans, 1);
 137         if (retval != ERROR_OK)
 138                 return retval;
 139
 140         tap_set_state(cmd->path[i]);
 141
 142         return ERROR_OK;
 143 }
 144
 145 /**
 146  * jtag_vpi_tms - ask a tms command
 147  * @cmd: tms command
 148  */
 149 static int jtag_vpi_tms(struct tms_command *cmd)
 150 {
 151         return jtag_vpi_tms_seq(cmd->bits, cmd->num_bits);
 152 }
 153
 154 static int jtag_vpi_state_move(tap_state_t state)
 155 {
 156         if (tap_get_state() == state)
 157                 return ERROR_OK;
 158
 159         uint8_t tms_scan = tap_get_tms_path(tap_get_state(), state);
 160         int tms_len = tap_get_tms_path_len(tap_get_state(), state);
 161
 162         int retval = jtag_vpi_tms_seq(&tms_scan, tms_len);
 163         if (retval != ERROR_OK)
 164                 return retval;
 165
 166         tap_set_state(state);
 167
 168         return ERROR_OK;
 169 }
 170
 171 static int jtag_vpi_queue_tdi_xfer(uint8_t *bits, int nb_bits, int tap_shift)
 172 {
 173         struct vpi_cmd vpi;
 174         int nb_bytes = (nb_bits / 8) + !!(nb_bits % 8);
 175
 176         vpi.cmd = tap_shift ? CMD_SCAN_CHAIN_FLIP_TMS : CMD_SCAN_CHAIN;
 177
 178         if (bits)
 179                 memcpy(vpi.buffer_out, bits, nb_bytes);
 180         else
 181                 memset(vpi.buffer_out, 0xff, nb_bytes);
 182
 183         vpi.length = nb_bytes;
 184         vpi.nb_bits = nb_bits;
 185
 186         int retval = jtag_vpi_send_cmd(&vpi);
 187         if (retval != ERROR_OK)
 188                 return retval;
 189
 190         retval = jtag_vpi_receive_cmd(&vpi);
 191         if (retval != ERROR_OK)
 192                 return retval;
 193
 194         if (bits)
 195                 memcpy(bits, vpi.buffer_in, nb_bytes);
 196
 197         return ERROR_OK;
 198 }
 199
 200 /**
 201  * jtag_vpi_queue_tdi - short description
 202  * @bits: bits to be queued on TDI (or NULL if 0 are to be queued)
 203  * @nb_bits: number of bits
 204  */
 205 static int jtag_vpi_queue_tdi(uint8_t *bits, int nb_bits, int tap_shift)
 206 {
 207         int nb_xfer = (nb_bits / (XFERT_MAX_SIZE * 8)) + !!(nb_bits % (XFERT_MAX_SIZE * 8));
 208         uint8_t *xmit_buffer = bits;
 209         int xmit_nb_bits = nb_bits;
 210         int i = 0;
 211         int retval;
 212
 213         while (nb_xfer) {
 214
 215                 if (nb_xfer ==  1) {
 216                         retval = jtag_vpi_queue_tdi_xfer(&xmit_buffer[i], xmit_nb_bits, tap_shift);
 217                         if (retval != ERROR_OK)
 218                                 return retval;
 219                 } else {
 220                         retval = jtag_vpi_queue_tdi_xfer(&xmit_buffer[i], XFERT_MAX_SIZE * 8, NO_TAP_SHIFT);
 221                         if (retval != ERROR_OK)
 222                                 return retval;
 223                         xmit_nb_bits -= XFERT_MAX_SIZE * 8;
 224                         i += XFERT_MAX_SIZE;
 225                 }
 226
 227                 nb_xfer--;
 228         }
 229
 230         return ERROR_OK;
 231 }
 232
 233 /**
 234  * jtag_vpi_clock_tms - clock a TMS transition
 235  * @tms: the TMS to be sent
 236  *
 237  * Triggers a TMS transition (ie. one JTAG TAP state move).
 238  */
 239 static int jtag_vpi_clock_tms(int tms)
 240 {
 241         const uint8_t tms_0 = 0;
 242         const uint8_t tms_1 = 1;
 243
 244         return jtag_vpi_tms_seq(tms ? &tms_1 : &tms_0, 1);
 245 }
 246
 247 /**
 248  * jtag_vpi_scan - launches a DR-scan or IR-scan
 249  * @cmd: the command to launch
 250  *
 251  * Launch a JTAG IR-scan or DR-scan
 252  *
 253  * Returns ERROR_OK if OK, ERROR_xxx if a read/write error occured.
 254  */
 255 static int jtag_vpi_scan(struct scan_command *cmd)
 256 {
 257         int scan_bits;
 258         uint8_t *buf = NULL;
 259         int retval = ERROR_OK;
 260
 261         scan_bits = jtag_build_buffer(cmd, &buf);
 262
 263         if (cmd->ir_scan) {
 264                 retval = jtag_vpi_state_move(TAP_IRSHIFT);
 265                 if (retval != ERROR_OK)
 266                         return retval;
 267         } else {
 268                 retval = jtag_vpi_state_move(TAP_DRSHIFT);
 269                 if (retval != ERROR_OK)
 270                         return retval;
 271         }
 272
 273         if (cmd->end_state == TAP_DRSHIFT) {
 274                 retval = jtag_vpi_queue_tdi(buf, scan_bits, NO_TAP_SHIFT);
 275                 if (retval != ERROR_OK)
 276                         return retval;
 277         } else {
 278                 retval = jtag_vpi_queue_tdi(buf, scan_bits, TAP_SHIFT);
 279                 if (retval != ERROR_OK)
 280                         return retval;
 281         }
 282
 283         if (cmd->end_state != TAP_DRSHIFT) {
 284                 /*
 285                  * As our JTAG is in an unstable state (IREXIT1 or DREXIT1), move it
 286                  * forward to a stable IRPAUSE or DRPAUSE.
 287                  */
 288                 retval = jtag_vpi_clock_tms(0);
 289                 if (retval != ERROR_OK)
 290                         return retval;
 291
 292                 if (cmd->ir_scan)
 293                         tap_set_state(TAP_IRPAUSE);
 294                 else
 295                         tap_set_state(TAP_DRPAUSE);
 296         }
 297
 298         retval = jtag_read_buffer(buf, cmd);
 299         if (retval != ERROR_OK)
 300                 return retval;
 301
 302         if (buf)
 303                 free(buf);
 304
 305         if (cmd->end_state != TAP_DRSHIFT) {
 306                 retval = jtag_vpi_state_move(cmd->end_state);
 307                 if (retval != ERROR_OK)
 308                         return retval;
 309         }
 310
 311         return ERROR_OK;
 312 }
 313
 314 static int jtag_vpi_runtest(int cycles, tap_state_t state)
 315 {
 316         int retval;
 317
 318         retval = jtag_vpi_state_move(TAP_IDLE);
 319         if (retval != ERROR_OK)
 320                 return retval;
 321
 322         retval = jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
 323         if (retval != ERROR_OK)
 324                 return retval;
 325
 326         return jtag_vpi_state_move(state);
 327 }
 328
 329 static int jtag_vpi_stableclocks(int cycles)
 330 {
 331         return jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
 332 }
 333
 334 static int jtag_vpi_execute_queue(void)
 335 {
 336         struct jtag_command *cmd;
 337         int retval = ERROR_OK;
 338
 339         for (cmd = jtag_command_queue; retval == ERROR_OK && cmd != NULL;
 340              cmd = cmd->next) {
 341                 switch (cmd->type) {
 342                 case JTAG_RESET:
 343                         retval = jtag_vpi_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 344                         break;
 345                 case JTAG_RUNTEST:
 346                         retval = jtag_vpi_runtest(cmd->cmd.runtest->num_cycles,
 347                                                   cmd->cmd.runtest->end_state);
 348                         break;
 349                 case JTAG_STABLECLOCKS:
 350                         retval = jtag_vpi_stableclocks(cmd->cmd.stableclocks->num_cycles);
 351                         break;
 352                 case JTAG_TLR_RESET:
 353                         retval = jtag_vpi_state_move(cmd->cmd.statemove->end_state);
 354                         break;
 355                 case JTAG_PATHMOVE:
 356                         retval = jtag_vpi_path_move(cmd->cmd.pathmove);
 357                         break;
 358                 case JTAG_TMS:
 359                         retval = jtag_vpi_tms(cmd->cmd.tms);
 360                         break;
 361                 case JTAG_SLEEP:
 362                         jtag_sleep(cmd->cmd.sleep->us);
 363                         break;
 364                 case JTAG_SCAN:
 365                         retval = jtag_vpi_scan(cmd->cmd.scan);
 366                         break;
 367                 }
 368         }
 369
 370         return retval;
 371 }
 372
 373 static int jtag_vpi_init(void)
 374 {
 375         sockfd = socket(AF_INET, SOCK_STREAM, 0);
 376         if (sockfd < 0) {
 377                 LOG_ERROR("Could not create socket");
 378                 return ERROR_FAIL;
 379         }
 380
 381         memset(&serv_addr, 0, sizeof(serv_addr));
 382
 383         serv_addr.sin_family = AF_INET;
 384         serv_addr.sin_port = htons(server_port);
 385
 386         if (inet_pton(AF_INET, SERVER_ADDRESS, &serv_addr.sin_addr) <= 0) {
 387                 LOG_ERROR("inet_pton error occured");
 388                 return ERROR_FAIL;
 389         }
 390
 391         if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
 392                 close(sockfd);
 393                 LOG_ERROR("Can't connect to %s : %u", SERVER_ADDRESS, server_port);
 394                 return ERROR_COMMAND_CLOSE_CONNECTION;
 395         }
 396
 397         LOG_INFO("Connection to %s : %u succeed", SERVER_ADDRESS, server_port);
 398
 399         return ERROR_OK;
 400 }
 401
 402 static int jtag_vpi_quit(void)
 403 {
 404         return close(sockfd);
 405 }
 406
 407 COMMAND_HANDLER(jtag_vpi_set_port)
 408 {
 409         if (CMD_ARGC == 0)
 410                 LOG_WARNING("You need to set a port number");
 411         else
 412                 COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], server_port);
 413
 414         LOG_INFO("Set server port to %u", server_port);
 415
 416         return ERROR_OK;
 417 }
 418
 419
 420 static const struct command_registration jtag_vpi_command_handlers[] = {
 421         {
 422                 .name = "jtag_vpi_set_port",
 423                 .handler = &jtag_vpi_set_port,
 424                 .mode = COMMAND_CONFIG,
 425                 .help = "set the port of the VPI server",
 426                 .usage = "description_string",
 427         },
 428         COMMAND_REGISTRATION_DONE
 429 };
 430
 431 struct jtag_interface jtag_vpi_interface = {
 432         .name = "jtag_vpi",
 433         .supported = DEBUG_CAP_TMS_SEQ,
 434         .commands = jtag_vpi_command_handlers,
 435         .transports = jtag_only,
 436
 437         .init = jtag_vpi_init,
 438         .quit = jtag_vpi_quit,
 439         .execute_queue = jtag_vpi_execute_queue,
 440 };