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   1 /*
   2  * JTAG to DPI driver
   3  *
   4  * Copyright (C) 2013 Franck Jullien, <elec4fun@gmail.com>
   5  *
   6  * Copyright (C) 2019-2020, Ampere Computing LLC
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <jtag/interface.h>
  30 #ifdef HAVE_ARPA_INET_H
  31 #include <arpa/inet.h>
  32 #endif
  33
  34 #ifndef _WIN32
  35 #include <netinet/tcp.h>
  36 #endif
  37
  38 #define SERVER_ADDRESS  "127.0.0.1"
  39 #define SERVER_PORT     5555
  40
  41 static uint16_t server_port = SERVER_PORT;
  42 static char *server_address;
  43
  44 static int sockfd;
  45 static struct sockaddr_in serv_addr;
  46
  47 static uint8_t *last_ir_buf;
  48 static int last_ir_num_bits;
  49
  50 static int write_sock(char *buf, size_t len)
  51 {
  52         if (buf == NULL) {
  53                 LOG_ERROR("%s: NULL 'buf' argument, file %s, line %d",
  54                         __func__, __FILE__, __LINE__);
  55                 return ERROR_FAIL;
  56         }
  57         if (write(sockfd, buf, len) != (ssize_t)len) {
  58                 LOG_ERROR("%s: %s, file %s, line %d", __func__,
  59                         strerror(errno), __FILE__, __LINE__);
  60                 return ERROR_FAIL;
  61         }
  62         return ERROR_OK;
  63 }
  64
  65 static int read_sock(char *buf, size_t len)
  66 {
  67         if (buf == NULL) {
  68                 LOG_ERROR("%s: NULL 'buf' argument, file %s, line %d",
  69                         __func__, __FILE__, __LINE__);
  70                 return ERROR_FAIL;
  71         }
  72         if (read(sockfd, buf, len) != (ssize_t)len) {
  73                 LOG_ERROR("%s: %s, file %s, line %d", __func__,
  74                         strerror(errno), __FILE__, __LINE__);
  75                 return ERROR_FAIL;
  76         }
  77         return ERROR_OK;
  78 }
  79
  80 /**
  81  * jtag_dpi_reset - ask to reset the JTAG device
  82  * @param trst 1 if TRST is to be asserted
  83  * @param srst 1 if SRST is to be asserted
  84  */
  85 static int jtag_dpi_reset(int trst, int srst)
  86 {
  87         char *buf = "reset\n";
  88         int ret = ERROR_OK;
  89
  90         LOG_DEBUG_IO("JTAG DRIVER DEBUG: reset trst: %i srst %i", trst, srst);
  91
  92         if (trst == 1) {
  93                 /* reset the JTAG TAP controller */
  94                 ret = write_sock(buf, strlen(buf));
  95                 if (ret != ERROR_OK) {
  96                         LOG_ERROR("write_sock() fail, file %s, line %d",
  97                                 __FILE__, __LINE__);
  98                 }
  99         }
 100
 101         if (srst == 1) {
 102                 /* System target reset not supported */
 103                 LOG_ERROR("DPI SRST not supported");
 104                 ret = ERROR_FAIL;
 105         }
 106
 107         return ret;
 108 }
 109
 110 /**
 111  * jtag_dpi_scan - launches a DR-scan or IR-scan
 112  * @param cmd the command to launch
 113  *
 114  * Launch a JTAG IR-scan or DR-scan
 115  *
 116  * Returns ERROR_OK if OK, ERROR_xxx if a read/write error occurred.
 117  */
 118 static int jtag_dpi_scan(struct scan_command *cmd)
 119 {
 120         char buf[20];
 121         uint8_t *data_buf;
 122         int num_bits, bytes;
 123         int ret = ERROR_OK;
 124
 125         num_bits = jtag_build_buffer(cmd, &data_buf);
 126         if (data_buf == NULL) {
 127                 LOG_ERROR("jtag_build_buffer call failed, data_buf == NULL, "
 128                         "file %s, line %d", __FILE__, __LINE__);
 129                 return ERROR_FAIL;
 130         }
 131
 132         bytes = DIV_ROUND_UP(num_bits, 8);
 133         if (cmd->ir_scan) {
 134                 free(last_ir_buf);
 135                 last_ir_buf = (uint8_t *)malloc(bytes * sizeof(uint8_t));
 136                 if (last_ir_buf == NULL) {
 137                         LOG_ERROR("%s: malloc fail, file %s, line %d",
 138                                 __func__, __FILE__, __LINE__);
 139                         ret = ERROR_FAIL;
 140                         goto out;
 141                 }
 142                 memcpy(last_ir_buf, data_buf, bytes);
 143                 last_ir_num_bits = num_bits;
 144         }
 145         snprintf(buf, sizeof(buf), "%s %d\n", cmd->ir_scan ? "ib" : "db", num_bits);
 146         ret = write_sock(buf, strlen(buf));
 147         if (ret != ERROR_OK) {
 148                 LOG_ERROR("write_sock() fail, file %s, line %d",
 149                         __FILE__, __LINE__);
 150                 goto out;
 151         }
 152         ret = write_sock((char *)data_buf, bytes);
 153         if (ret != ERROR_OK) {
 154                 LOG_ERROR("write_sock() fail, file %s, line %d",
 155                         __FILE__, __LINE__);
 156                 goto out;
 157         }
 158         ret = read_sock((char *)data_buf, bytes);
 159         if (ret != ERROR_OK) {
 160                 LOG_ERROR("read_sock() fail, file %s, line %d",
 161                         __FILE__, __LINE__);
 162                 goto out;
 163         }
 164
 165         ret = jtag_read_buffer(data_buf, cmd);
 166         if (ret != ERROR_OK) {
 167                 LOG_ERROR("jtag_read_buffer() fail, file %s, line %d",
 168                         __FILE__, __LINE__);
 169                 goto out;
 170         }
 171
 172 out:
 173         free(data_buf);
 174         return ret;
 175 }
 176
 177 static int jtag_dpi_runtest(int cycles)
 178 {
 179         char buf[20];
 180         uint8_t *data_buf = last_ir_buf, *read_scan;
 181         int num_bits = last_ir_num_bits, bytes;
 182         int ret = ERROR_OK;
 183
 184         if (data_buf == NULL) {
 185                 LOG_ERROR("%s: NULL 'data_buf' argument, file %s, line %d",
 186                         __func__, __FILE__, __LINE__);
 187                 return ERROR_FAIL;
 188         }
 189         if (num_bits <= 0) {
 190                 LOG_ERROR("%s: 'num_bits' invalid value, file %s, line %d",
 191                         __func__, __FILE__, __LINE__);
 192                 return ERROR_FAIL;
 193         }
 194
 195         bytes = DIV_ROUND_UP(num_bits, 8);
 196         read_scan = (uint8_t *)malloc(bytes * sizeof(uint8_t));
 197         if (read_scan == NULL) {
 198                 LOG_ERROR("%s: malloc fail, file %s, line %d",
 199                         __func__, __FILE__, __LINE__);
 200                 return ERROR_FAIL;
 201         }
 202         snprintf(buf, sizeof(buf), "ib %d\n", num_bits);
 203         while (cycles > 0) {
 204                 ret = write_sock(buf, strlen(buf));
 205                 if (ret != ERROR_OK) {
 206                         LOG_ERROR("write_sock() fail, file %s, line %d",
 207                                 __FILE__, __LINE__);
 208                         goto out;
 209                 }
 210                 ret = write_sock((char *)data_buf, bytes);
 211                 if (ret != ERROR_OK) {
 212                         LOG_ERROR("write_sock() fail, file %s, line %d",
 213                                 __FILE__, __LINE__);
 214                         goto out;
 215                 }
 216                 ret = read_sock((char *)read_scan, bytes);
 217                 if (ret != ERROR_OK) {
 218                         LOG_ERROR("read_sock() fail, file %s, line %d",
 219                                 __FILE__, __LINE__);
 220                         goto out;
 221                 }
 222
 223                 cycles -= num_bits + 6;
 224         }
 225
 226 out:
 227         free(read_scan);
 228         return ret;
 229 }
 230
 231 static int jtag_dpi_stableclocks(int cycles)
 232 {
 233         return jtag_dpi_runtest(cycles);
 234 }
 235
 236 static int jtag_dpi_execute_queue(void)
 237 {
 238         struct jtag_command *cmd;
 239         int ret = ERROR_OK;
 240
 241         for (cmd = jtag_command_queue; ret == ERROR_OK && cmd != NULL;
 242              cmd = cmd->next) {
 243                 switch (cmd->type) {
 244                 case JTAG_RUNTEST:
 245                         ret = jtag_dpi_runtest(cmd->cmd.runtest->num_cycles);
 246                         break;
 247                 case JTAG_STABLECLOCKS:
 248                         ret = jtag_dpi_stableclocks(cmd->cmd.stableclocks->num_cycles);
 249                         break;
 250                 case JTAG_TLR_RESET:
 251                         /* Enter Test-Logic-Reset state by asserting TRST */
 252                         if (cmd->cmd.statemove->end_state == TAP_RESET)
 253                                 jtag_dpi_reset(1, 0);
 254                         break;
 255                 case JTAG_PATHMOVE:
 256                         /* unsupported */
 257                         break;
 258                 case JTAG_TMS:
 259                         /* unsupported */
 260                         break;
 261                 case JTAG_SLEEP:
 262                         jtag_sleep(cmd->cmd.sleep->us);
 263                         break;
 264                 case JTAG_SCAN:
 265                         ret = jtag_dpi_scan(cmd->cmd.scan);
 266                         break;
 267                 default:
 268                         LOG_ERROR("BUG: unknown JTAG command type 0x%X",
 269                                   cmd->type);
 270                         ret = ERROR_FAIL;
 271                         break;
 272                 }
 273         }
 274
 275         return ret;
 276 }
 277
 278 static int jtag_dpi_init(void)
 279 {
 280         sockfd = socket(AF_INET, SOCK_STREAM, 0);
 281         if (sockfd < 0) {
 282                 LOG_ERROR("socket: %s, function %s, file %s, line %d",
 283                         strerror(errno), __func__, __FILE__, __LINE__);
 284                 return ERROR_FAIL;
 285         }
 286
 287         memset(&serv_addr, 0, sizeof(serv_addr));
 288
 289         serv_addr.sin_family = AF_INET;
 290         serv_addr.sin_port = htons(server_port);
 291
 292         if (server_address == NULL) {
 293                 server_address = strdup(SERVER_ADDRESS);
 294                 if (server_address == NULL) {
 295                         LOG_ERROR("%s: strdup fail, file %s, line %d",
 296                                 __func__, __FILE__, __LINE__);
 297                         return ERROR_FAIL;
 298                 }
 299         }
 300
 301         serv_addr.sin_addr.s_addr = inet_addr(server_address);
 302
 303         if (serv_addr.sin_addr.s_addr == INADDR_NONE) {
 304                 LOG_ERROR("inet_addr error occurred");
 305                 return ERROR_FAIL;
 306         }
 307
 308         if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
 309                 close(sockfd);
 310                 LOG_ERROR("Can't connect to %s : %" PRIu16, server_address, server_port);
 311                 return ERROR_FAIL;
 312         }
 313         if (serv_addr.sin_addr.s_addr == htonl(INADDR_LOOPBACK)) {
 314                 /* This increases performance dramatically for local
 315                 * connections, which is the most likely arrangement
 316                 * for a DPI connection. */
 317                 int flag = 1;
 318                 setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, (char *)&flag, sizeof(int));
 319         }
 320
 321         LOG_INFO("Connection to %s : %" PRIu16 " succeed", server_address, server_port);
 322
 323         return ERROR_OK;
 324 }
 325
 326 static int jtag_dpi_quit(void)
 327 {
 328         free(server_address);
 329         server_address = NULL;
 330
 331         return close(sockfd);
 332 }
 333
 334 COMMAND_HANDLER(jtag_dpi_set_port)
 335 {
 336         if (CMD_ARGC > 1)
 337                 return ERROR_COMMAND_SYNTAX_ERROR;
 338         else if (CMD_ARGC == 0)
 339                 LOG_INFO("Using server port %" PRIu16, server_port);
 340         else {
 341                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], server_port);
 342                 LOG_INFO("Set server port to %" PRIu16, server_port);
 343         }
 344
 345         return ERROR_OK;
 346 }
 347
 348 COMMAND_HANDLER(jtag_dpi_set_address)
 349 {
 350         if (CMD_ARGC > 1)
 351                 return ERROR_COMMAND_SYNTAX_ERROR;
 352         else if (CMD_ARGC == 0) {
 353                 if (server_address == NULL) {
 354                         server_address = strdup(SERVER_ADDRESS);
 355                         if (server_address == NULL) {
 356                                 LOG_ERROR("%s: strdup fail, file %s, line %d",
 357                                         __func__, __FILE__, __LINE__);
 358                                 return ERROR_FAIL;
 359                         }
 360                 }
 361                 LOG_INFO("Using server address %s", server_address);
 362         } else {
 363                 free(server_address);
 364                 server_address = strdup(CMD_ARGV[0]);
 365                 if (server_address == NULL) {
 366                         LOG_ERROR("%s: strdup fail, file %s, line %d",
 367                                 __func__, __FILE__, __LINE__);
 368                         return ERROR_FAIL;
 369                 }
 370                 LOG_INFO("Set server address to %s", server_address);
 371         }
 372
 373         return ERROR_OK;
 374 }
 375
 376 static const struct command_registration jtag_dpi_command_handlers[] = {
 377         {
 378                 .name = "jtag_dpi_set_port",
 379                 .handler = &jtag_dpi_set_port,
 380                 .mode = COMMAND_CONFIG,
 381                 .help = "set the port of the DPI server",
 382                 .usage = "[port]",
 383         },
 384         {
 385                 .name = "jtag_dpi_set_address",
 386                 .handler = &jtag_dpi_set_address,
 387                 .mode = COMMAND_CONFIG,
 388                 .help = "set the address of the DPI server",
 389                 .usage = "[address]",
 390         },
 391         COMMAND_REGISTRATION_DONE
 392 };
 393
 394 static struct jtag_interface jtag_dpi_interface = {
 395         .supported = DEBUG_CAP_TMS_SEQ,
 396         .execute_queue = jtag_dpi_execute_queue,
 397 };
 398
 399 struct adapter_driver jtag_dpi_adapter_driver = {
 400         .name = "jtag_dpi",
 401         .transports = jtag_only,
 402         .commands = jtag_dpi_command_handlers,
 403         .init = jtag_dpi_init,
 404         .quit = jtag_dpi_quit,
 405         .reset = jtag_dpi_reset,
 406         .jtag_ops = &jtag_dpi_interface,
 407 };