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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 = DIV_ROUND_UP(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         uint8_t trans[DIV_ROUND_UP(cmd->num_states, 8)];
 127
 128         memset(trans, 0, DIV_ROUND_UP(cmd->num_states, 8));
 129
 130         for (int i = 0; i < cmd->num_states; i++) {
 131                 if (tap_state_transition(tap_get_state(), true) == cmd->path[i])
 132                         buf_set_u32(trans, i, 1, 1);
 133                 tap_set_state(cmd->path[i]);
 134         }
 135
 136         return jtag_vpi_tms_seq(trans, cmd->num_states);
 137 }
 138
 139 /**
 140  * jtag_vpi_tms - ask a tms command
 141  * @cmd: tms command
 142  */
 143 static int jtag_vpi_tms(struct tms_command *cmd)
 144 {
 145         return jtag_vpi_tms_seq(cmd->bits, cmd->num_bits);
 146 }
 147
 148 static int jtag_vpi_state_move(tap_state_t state)
 149 {
 150         if (tap_get_state() == state)
 151                 return ERROR_OK;
 152
 153         uint8_t tms_scan = tap_get_tms_path(tap_get_state(), state);
 154         int tms_len = tap_get_tms_path_len(tap_get_state(), state);
 155
 156         int retval = jtag_vpi_tms_seq(&tms_scan, tms_len);
 157         if (retval != ERROR_OK)
 158                 return retval;
 159
 160         tap_set_state(state);
 161
 162         return ERROR_OK;
 163 }
 164
 165 static int jtag_vpi_queue_tdi_xfer(uint8_t *bits, int nb_bits, int tap_shift)
 166 {
 167         struct vpi_cmd vpi;
 168         int nb_bytes = DIV_ROUND_UP(nb_bits, 8);
 169
 170         vpi.cmd = tap_shift ? CMD_SCAN_CHAIN_FLIP_TMS : CMD_SCAN_CHAIN;
 171
 172         if (bits)
 173                 memcpy(vpi.buffer_out, bits, nb_bytes);
 174         else
 175                 memset(vpi.buffer_out, 0xff, nb_bytes);
 176
 177         vpi.length = nb_bytes;
 178         vpi.nb_bits = nb_bits;
 179
 180         int retval = jtag_vpi_send_cmd(&vpi);
 181         if (retval != ERROR_OK)
 182                 return retval;
 183
 184         retval = jtag_vpi_receive_cmd(&vpi);
 185         if (retval != ERROR_OK)
 186                 return retval;
 187
 188         if (bits)
 189                 memcpy(bits, vpi.buffer_in, nb_bytes);
 190
 191         return ERROR_OK;
 192 }
 193
 194 /**
 195  * jtag_vpi_queue_tdi - short description
 196  * @bits: bits to be queued on TDI (or NULL if 0 are to be queued)
 197  * @nb_bits: number of bits
 198  */
 199 static int jtag_vpi_queue_tdi(uint8_t *bits, int nb_bits, int tap_shift)
 200 {
 201         int nb_xfer = DIV_ROUND_UP(nb_bits, XFERT_MAX_SIZE * 8);
 202         uint8_t *xmit_buffer = bits;
 203         int xmit_nb_bits = nb_bits;
 204         int i = 0;
 205         int retval;
 206
 207         while (nb_xfer) {
 208
 209                 if (nb_xfer ==  1) {
 210                         retval = jtag_vpi_queue_tdi_xfer(&xmit_buffer[i], xmit_nb_bits, tap_shift);
 211                         if (retval != ERROR_OK)
 212                                 return retval;
 213                 } else {
 214                         retval = jtag_vpi_queue_tdi_xfer(&xmit_buffer[i], XFERT_MAX_SIZE * 8, NO_TAP_SHIFT);
 215                         if (retval != ERROR_OK)
 216                                 return retval;
 217                         xmit_nb_bits -= XFERT_MAX_SIZE * 8;
 218                         i += XFERT_MAX_SIZE;
 219                 }
 220
 221                 nb_xfer--;
 222         }
 223
 224         return ERROR_OK;
 225 }
 226
 227 /**
 228  * jtag_vpi_clock_tms - clock a TMS transition
 229  * @tms: the TMS to be sent
 230  *
 231  * Triggers a TMS transition (ie. one JTAG TAP state move).
 232  */
 233 static int jtag_vpi_clock_tms(int tms)
 234 {
 235         const uint8_t tms_0 = 0;
 236         const uint8_t tms_1 = 1;
 237
 238         return jtag_vpi_tms_seq(tms ? &tms_1 : &tms_0, 1);
 239 }
 240
 241 /**
 242  * jtag_vpi_scan - launches a DR-scan or IR-scan
 243  * @cmd: the command to launch
 244  *
 245  * Launch a JTAG IR-scan or DR-scan
 246  *
 247  * Returns ERROR_OK if OK, ERROR_xxx if a read/write error occured.
 248  */
 249 static int jtag_vpi_scan(struct scan_command *cmd)
 250 {
 251         int scan_bits;
 252         uint8_t *buf = NULL;
 253         int retval = ERROR_OK;
 254
 255         scan_bits = jtag_build_buffer(cmd, &buf);
 256
 257         if (cmd->ir_scan) {
 258                 retval = jtag_vpi_state_move(TAP_IRSHIFT);
 259                 if (retval != ERROR_OK)
 260                         return retval;
 261         } else {
 262                 retval = jtag_vpi_state_move(TAP_DRSHIFT);
 263                 if (retval != ERROR_OK)
 264                         return retval;
 265         }
 266
 267         if (cmd->end_state == TAP_DRSHIFT) {
 268                 retval = jtag_vpi_queue_tdi(buf, scan_bits, NO_TAP_SHIFT);
 269                 if (retval != ERROR_OK)
 270                         return retval;
 271         } else {
 272                 retval = jtag_vpi_queue_tdi(buf, scan_bits, TAP_SHIFT);
 273                 if (retval != ERROR_OK)
 274                         return retval;
 275         }
 276
 277         if (cmd->end_state != TAP_DRSHIFT) {
 278                 /*
 279                  * As our JTAG is in an unstable state (IREXIT1 or DREXIT1), move it
 280                  * forward to a stable IRPAUSE or DRPAUSE.
 281                  */
 282                 retval = jtag_vpi_clock_tms(0);
 283                 if (retval != ERROR_OK)
 284                         return retval;
 285
 286                 if (cmd->ir_scan)
 287                         tap_set_state(TAP_IRPAUSE);
 288                 else
 289                         tap_set_state(TAP_DRPAUSE);
 290         }
 291
 292         retval = jtag_read_buffer(buf, cmd);
 293         if (retval != ERROR_OK)
 294                 return retval;
 295
 296         if (buf)
 297                 free(buf);
 298
 299         if (cmd->end_state != TAP_DRSHIFT) {
 300                 retval = jtag_vpi_state_move(cmd->end_state);
 301                 if (retval != ERROR_OK)
 302                         return retval;
 303         }
 304
 305         return ERROR_OK;
 306 }
 307
 308 static int jtag_vpi_runtest(int cycles, tap_state_t state)
 309 {
 310         int retval;
 311
 312         retval = jtag_vpi_state_move(TAP_IDLE);
 313         if (retval != ERROR_OK)
 314                 return retval;
 315
 316         retval = jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
 317         if (retval != ERROR_OK)
 318                 return retval;
 319
 320         return jtag_vpi_state_move(state);
 321 }
 322
 323 static int jtag_vpi_stableclocks(int cycles)
 324 {
 325         return jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
 326 }
 327
 328 static int jtag_vpi_execute_queue(void)
 329 {
 330         struct jtag_command *cmd;
 331         int retval = ERROR_OK;
 332
 333         for (cmd = jtag_command_queue; retval == ERROR_OK && cmd != NULL;
 334              cmd = cmd->next) {
 335                 switch (cmd->type) {
 336                 case JTAG_RESET:
 337                         retval = jtag_vpi_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 338                         break;
 339                 case JTAG_RUNTEST:
 340                         retval = jtag_vpi_runtest(cmd->cmd.runtest->num_cycles,
 341                                                   cmd->cmd.runtest->end_state);
 342                         break;
 343                 case JTAG_STABLECLOCKS:
 344                         retval = jtag_vpi_stableclocks(cmd->cmd.stableclocks->num_cycles);
 345                         break;
 346                 case JTAG_TLR_RESET:
 347                         retval = jtag_vpi_state_move(cmd->cmd.statemove->end_state);
 348                         break;
 349                 case JTAG_PATHMOVE:
 350                         retval = jtag_vpi_path_move(cmd->cmd.pathmove);
 351                         break;
 352                 case JTAG_TMS:
 353                         retval = jtag_vpi_tms(cmd->cmd.tms);
 354                         break;
 355                 case JTAG_SLEEP:
 356                         jtag_sleep(cmd->cmd.sleep->us);
 357                         break;
 358                 case JTAG_SCAN:
 359                         retval = jtag_vpi_scan(cmd->cmd.scan);
 360                         break;
 361                 }
 362         }
 363
 364         return retval;
 365 }
 366
 367 static int jtag_vpi_init(void)
 368 {
 369         sockfd = socket(AF_INET, SOCK_STREAM, 0);
 370         if (sockfd < 0) {
 371                 LOG_ERROR("Could not create socket");
 372                 return ERROR_FAIL;
 373         }
 374
 375         memset(&serv_addr, 0, sizeof(serv_addr));
 376
 377         serv_addr.sin_family = AF_INET;
 378         serv_addr.sin_port = htons(server_port);
 379
 380         if (inet_pton(AF_INET, SERVER_ADDRESS, &serv_addr.sin_addr) <= 0) {
 381                 LOG_ERROR("inet_pton error occured");
 382                 return ERROR_FAIL;
 383         }
 384
 385         if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
 386                 close(sockfd);
 387                 LOG_ERROR("Can't connect to %s : %u", SERVER_ADDRESS, server_port);
 388                 return ERROR_COMMAND_CLOSE_CONNECTION;
 389         }
 390
 391         LOG_INFO("Connection to %s : %u succeed", SERVER_ADDRESS, server_port);
 392
 393         return ERROR_OK;
 394 }
 395
 396 static int jtag_vpi_quit(void)
 397 {
 398         return close(sockfd);
 399 }
 400
 401 COMMAND_HANDLER(jtag_vpi_set_port)
 402 {
 403         if (CMD_ARGC == 0)
 404                 LOG_WARNING("You need to set a port number");
 405         else
 406                 COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], server_port);
 407
 408         LOG_INFO("Set server port to %u", server_port);
 409
 410         return ERROR_OK;
 411 }
 412
 413
 414 static const struct command_registration jtag_vpi_command_handlers[] = {
 415         {
 416                 .name = "jtag_vpi_set_port",
 417                 .handler = &jtag_vpi_set_port,
 418                 .mode = COMMAND_CONFIG,
 419                 .help = "set the port of the VPI server",
 420                 .usage = "description_string",
 421         },
 422         COMMAND_REGISTRATION_DONE
 423 };
 424
 425 struct jtag_interface jtag_vpi_interface = {
 426         .name = "jtag_vpi",
 427         .supported = DEBUG_CAP_TMS_SEQ,
 428         .commands = jtag_vpi_command_handlers,
 429         .transports = jtag_only,
 430
 431         .init = jtag_vpi_init,
 432         .quit = jtag_vpi_quit,
 433         .execute_queue = jtag_vpi_execute_queue,
 434 };